head 1.1; branch 1.1.1; access; symbols netbsd-8-3-RELEASE:1.1.1.8.6.1 netbsd-9-4-RELEASE:1.1.1.10 netbsd-10-0-RELEASE:1.1.1.11 netbsd-10-0-RC6:1.1.1.11 netbsd-10-0-RC5:1.1.1.11 netbsd-10-0-RC4:1.1.1.11 netbsd-10-0-RC3:1.1.1.11 netbsd-10-0-RC2:1.1.1.11 netbsd-10-0-RC1:1.1.1.11 netbsd-10:1.1.1.11.0.6 netbsd-10-base:1.1.1.11 ntp-4-2-8p15:1.1.1.11 netbsd-9-3-RELEASE:1.1.1.10 cjep_sun2x-base1:1.1.1.11 cjep_sun2x:1.1.1.11.0.4 cjep_sun2x-base:1.1.1.11 cjep_staticlib_x-base1:1.1.1.11 netbsd-9-2-RELEASE:1.1.1.10 cjep_staticlib_x:1.1.1.11.0.2 cjep_staticlib_x-base:1.1.1.11 netbsd-9-1-RELEASE:1.1.1.10 ntp-4-2-8p14:1.1.1.11 phil-wifi-20200421:1.1.1.10 phil-wifi-20200411:1.1.1.10 is-mlppp:1.1.1.10.0.4 is-mlppp-base:1.1.1.10 phil-wifi-20200406:1.1.1.10 netbsd-8-2-RELEASE:1.1.1.8.6.1 netbsd-9-0-RELEASE:1.1.1.10 netbsd-9-0-RC2:1.1.1.10 netbsd-9-0-RC1:1.1.1.10 phil-wifi-20191119:1.1.1.10 netbsd-9:1.1.1.10.0.2 netbsd-9-base:1.1.1.10 phil-wifi-20190609:1.1.1.10 netbsd-8-1-RELEASE:1.1.1.8.6.1 netbsd-8-1-RC1:1.1.1.8.6.1 pgoyette-compat-merge-20190127:1.1.1.8.12.2 pgoyette-compat-20190127:1.1.1.10 pgoyette-compat-20190118:1.1.1.10 pgoyette-compat-1226:1.1.1.10 pgoyette-compat-1126:1.1.1.10 pgoyette-compat-1020:1.1.1.10 pgoyette-compat-0930:1.1.1.10 ntp-4-2-8p12:1.1.1.10 pgoyette-compat-0906:1.1.1.9 netbsd-7-2-RELEASE:1.1.1.1.6.6 pgoyette-compat-0728:1.1.1.9 netbsd-8-0-RELEASE:1.1.1.8.6.1 phil-wifi:1.1.1.9.0.2 phil-wifi-base:1.1.1.9 pgoyette-compat-0625:1.1.1.9 netbsd-8-0-RC2:1.1.1.8.6.1 pgoyette-compat-0521:1.1.1.9 pgoyette-compat-0502:1.1.1.9 pgoyette-compat-0422:1.1.1.9 netbsd-8-0-RC1:1.1.1.8.6.1 pgoyette-compat-0415:1.1.1.9 pgoyette-compat-0407:1.1.1.9 ntp-4-2-8p11:1.1.1.9 pgoyette-compat-0330:1.1.1.8 pgoyette-compat-0322:1.1.1.8 pgoyette-compat-0315:1.1.1.8 netbsd-7-1-2-RELEASE:1.1.1.1.6.5.4.1 pgoyette-compat:1.1.1.8.0.12 pgoyette-compat-base:1.1.1.8 netbsd-7-1-1-RELEASE:1.1.1.1.6.5.4.1 matt-nb8-mediatek:1.1.1.8.0.10 matt-nb8-mediatek-base:1.1.1.8 perseant-stdc-iso10646:1.1.1.8.0.8 perseant-stdc-iso10646-base:1.1.1.8 netbsd-8:1.1.1.8.0.6 netbsd-8-base:1.1.1.8 prg-localcount2-base3:1.1.1.8 prg-localcount2-base2:1.1.1.8 prg-localcount2-base1:1.1.1.8 prg-localcount2:1.1.1.8.0.4 prg-localcount2-base:1.1.1.8 pgoyette-localcount-20170426:1.1.1.8 bouyer-socketcan-base1:1.1.1.8 ntp-4-2-8p10:1.1.1.8 pgoyette-localcount-20170320:1.1.1.8 netbsd-7-1:1.1.1.1.6.5.0.4 netbsd-7-1-RELEASE:1.1.1.1.6.5 netbsd-7-1-RC2:1.1.1.1.6.5 netbsd-7-nhusb-base-20170116:1.1.1.1.6.5 bouyer-socketcan:1.1.1.8.0.2 bouyer-socketcan-base:1.1.1.8 pgoyette-localcount-20170107:1.1.1.8 netbsd-7-1-RC1:1.1.1.1.6.5 ntp-4-2-8p9:1.1.1.8 pgoyette-localcount-20161104:1.1.1.7 netbsd-7-0-2-RELEASE:1.1.1.1.6.2.2.3 localcount-20160914:1.1.1.7 netbsd-7-nhusb:1.1.1.1.6.5.0.2 netbsd-7-nhusb-base:1.1.1.1.6.5 pgoyette-localcount-20160806:1.1.1.7 pgoyette-localcount-20160726:1.1.1.7 pgoyette-localcount:1.1.1.7.0.2 pgoyette-localcount-base:1.1.1.7 ntp-4-2-8p8:1.1.1.7 netbsd-7-0-1-RELEASE:1.1.1.1.6.2.2.2 ntp-4-2-8p7:1.1.1.6 ntp-4-2-8p5:1.1.1.5 ntp-4-2-8p4:1.1.1.5 netbsd-7-0:1.1.1.1.6.2.0.2 netbsd-7-0-RELEASE:1.1.1.1.6.2 netbsd-7-0-RC3:1.1.1.1.6.2 netbsd-7-0-RC2:1.1.1.1.6.2 ntp-4-2-8p3:1.1.1.4 netbsd-7-0-RC1:1.1.1.1.6.2 ntp-4-2-8p2:1.1.1.3 netbsd-5-1:1.1.1.2.0.12 netbsd-5-2:1.1.1.2.0.10 netbsd-5:1.1.1.2.0.8 netbsd-6:1.1.1.2.0.6 netbsd-6-0:1.1.1.2.0.4 netbsd-6-1:1.1.1.2.0.2 ntp-4-2-8:1.1.1.2 tls-maxphys-base:1.1.1.1 tls-maxphys:1.1.1.1.0.8 netbsd-7:1.1.1.1.0.6 netbsd-7-base:1.1.1.1 yamt-pagecache:1.1.1.1.0.4 yamt-pagecache-base9:1.1.1.1 tls-earlyentropy:1.1.1.1.0.2 tls-earlyentropy-base:1.1.1.1 riastradh-xf86-video-intel-2-7-1-pre-2-21-15:1.1.1.1 riastradh-drm2-base3:1.1.1.1 ntp-2-4-7p404:1.1.1.1 UDEL:1.1.1; locks; strict; comment @# @; 1.1 date 2013.12.27.23.30.55; author christos; state Exp; branches 1.1.1.1; next ; commitid lUOr4MoxyTWJnPix; 1.1.1.1 date 2013.12.27.23.30.55; author christos; state Exp; branches 1.1.1.1.4.1 1.1.1.1.6.1 1.1.1.1.8.1; next 1.1.1.2; commitid lUOr4MoxyTWJnPix; 1.1.1.2 date 2014.12.19.20.37.42; author christos; state Exp; branches 1.1.1.2.2.1 1.1.1.2.4.1 1.1.1.2.6.1 1.1.1.2.8.1 1.1.1.2.10.1 1.1.1.2.12.1; next 1.1.1.3; commitid ZhiTe4k7DUh9XG2y; 1.1.1.3 date 2015.04.07.16.49.08; author christos; state Exp; branches; next 1.1.1.4; commitid 3UUnsImQ7rfebGgy; 1.1.1.4 date 2015.07.10.13.02.59; author christos; state Exp; branches; next 1.1.1.5; commitid DcE5zM5BcAizUJsy; 1.1.1.5 date 2015.10.23.17.47.40; author christos; state Exp; branches; next 1.1.1.6; commitid l4KkwFjOmdO27gGy; 1.1.1.6 date 2016.05.01.15.57.23; author christos; state Exp; branches; next 1.1.1.7; commitid b5SfeFzHnXqg0N4z; 1.1.1.7 date 2016.06.03.20.19.13; author christos; state Exp; branches 1.1.1.7.2.1; 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1.1.1.8.12.2 date 2018.09.30.01.45.18; author pgoyette; state Exp; branches; next ; commitid SQ44grEPCeKPh4UA; 1.1.1.9.2.1 date 2019.06.10.21.51.20; author christos; state Exp; branches; next ; commitid jtc8rnCzWiEEHGqB; desc @@ 1.1 log @Initial revision @ text @/* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, four kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm monitor | Cm ntp | .Cm pps | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm monitor | Cm ntp | .Cm pps | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm pps Enables the pulse-per-second (PPS) signal when frequency and time is disciplined by the precision time kernel modifications. See the .Qq A Kernel Model for Precision Timekeeping (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page for further information. The default for this flag is .Ic disable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document corresponds to version #VERSION# of NTP. This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.1 log @import devel ntpd to avoid amplification attacks. @ text @@ 1.1.1.1.6.1 log @Apply patch (requested by christos in ticket #351): external/bsd/ntp/Makefile.inc patch external/bsd/ntp/importdate patch external/bsd/ntp/bin/ntpd/Makefile patch external/bsd/ntp/dist/COPYRIGHT patch external/bsd/ntp/dist/ChangeLog patch external/bsd/ntp/dist/CommitLog patch external/bsd/ntp/dist/Makefile.am patch external/bsd/ntp/dist/Makefile.in patch external/bsd/ntp/dist/NEWS patch external/bsd/ntp/dist/aclocal.m4 patch external/bsd/ntp/dist/bootstrap patch external/bsd/ntp/dist/build patch external/bsd/ntp/dist/config.h.in patch external/bsd/ntp/dist/configure patch external/bsd/ntp/dist/configure.ac patch external/bsd/ntp/dist/packageinfo.sh patch external/bsd/ntp/dist/adjtimed/Makefile.in patch external/bsd/ntp/dist/adjtimed/adjtimed.c patch external/bsd/ntp/dist/clockstuff/Makefile.in patch external/bsd/ntp/dist/clockstuff/chutest.c patch external/bsd/ntp/dist/clockstuff/propdelay.c patch external/bsd/ntp/dist/html/access.html patch external/bsd/ntp/dist/html/accopt.html patch external/bsd/ntp/dist/html/assoc.html patch external/bsd/ntp/dist/html/audio.html patch external/bsd/ntp/dist/html/authentic.html patch external/bsd/ntp/dist/html/authopt.html patch external/bsd/ntp/dist/html/autokey.html patch external/bsd/ntp/dist/html/bugs.html patch external/bsd/ntp/dist/html/build.html patch external/bsd/ntp/dist/html/clock.html patch external/bsd/ntp/dist/html/clockopt.html patch external/bsd/ntp/dist/html/cluster.html patch external/bsd/ntp/dist/html/comdex.html patch external/bsd/ntp/dist/html/config.html patch external/bsd/ntp/dist/html/confopt.html patch external/bsd/ntp/dist/html/copyright.html patch external/bsd/ntp/dist/html/debug.html patch external/bsd/ntp/dist/html/decode.html patch external/bsd/ntp/dist/html/discipline.html patch 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external/bsd/ntp/dist/sntp/libevent/m4/openldap-thread-check.m4 patch external/bsd/ntp/dist/sntp/libevent/sample/Makefile.in patch external/bsd/ntp/dist/sntp/libevent/sample/dns-example.c patch external/bsd/ntp/dist/sntp/libevent/sample/event-read-fifo.c patch external/bsd/ntp/dist/sntp/libevent/sample/hello-world.c patch external/bsd/ntp/dist/sntp/libevent/sample/hostcheck.c patch external/bsd/ntp/dist/sntp/libevent/sample/hostcheck.h patch external/bsd/ntp/dist/sntp/libevent/sample/http-server.c patch external/bsd/ntp/dist/sntp/libevent/sample/https-client.c patch external/bsd/ntp/dist/sntp/libevent/sample/include.am patch external/bsd/ntp/dist/sntp/libevent/sample/le-proxy.c patch external/bsd/ntp/dist/sntp/libevent/sample/openssl_hostname_validation.c patch external/bsd/ntp/dist/sntp/libevent/sample/openssl_hostname_validation.h patch external/bsd/ntp/dist/sntp/libevent/sample/signal-test.c patch external/bsd/ntp/dist/sntp/libevent/sample/time-test.c patch external/bsd/ntp/dist/sntp/libevent/test/Makefile.in patch external/bsd/ntp/dist/sntp/libevent/test/Makefile.nmake patch external/bsd/ntp/dist/sntp/libevent/test/bench.c patch external/bsd/ntp/dist/sntp/libevent/test/bench_cascade.c patch external/bsd/ntp/dist/sntp/libevent/test/bench_http.c patch external/bsd/ntp/dist/sntp/libevent/test/bench_httpclient.c patch external/bsd/ntp/dist/sntp/libevent/test/include.am patch external/bsd/ntp/dist/sntp/libevent/test/print-winsock-errors.c patch external/bsd/ntp/dist/sntp/libevent/test/regress.c patch external/bsd/ntp/dist/sntp/libevent/test/regress.gen.c patch external/bsd/ntp/dist/sntp/libevent/test/regress.gen.h patch external/bsd/ntp/dist/sntp/libevent/test/regress.h patch external/bsd/ntp/dist/sntp/libevent/test/regress_buffer.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_bufferevent.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_dns.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_et.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_finalize.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_http.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_iocp.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_listener.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_main.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_minheap.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_rpc.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_ssl.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_testutils.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_testutils.h patch external/bsd/ntp/dist/sntp/libevent/test/regress_thread.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_thread.h patch external/bsd/ntp/dist/sntp/libevent/test/regress_util.c patch external/bsd/ntp/dist/sntp/libevent/test/regress_zlib.c patch external/bsd/ntp/dist/sntp/libevent/test/rpcgen_wrapper.sh patch external/bsd/ntp/dist/sntp/libevent/test/test-changelist.c patch external/bsd/ntp/dist/sntp/libevent/test/test-closed.c patch external/bsd/ntp/dist/sntp/libevent/test/test-dumpevents.c patch external/bsd/ntp/dist/sntp/libevent/test/test-eof.c patch external/bsd/ntp/dist/sntp/libevent/test/test-fdleak.c patch external/bsd/ntp/dist/sntp/libevent/test/test-init.c patch external/bsd/ntp/dist/sntp/libevent/test/test-ratelim.c patch external/bsd/ntp/dist/sntp/libevent/test/test-ratelim.sh patch external/bsd/ntp/dist/sntp/libevent/test/test-time.c patch external/bsd/ntp/dist/sntp/libevent/test/test-weof.c patch external/bsd/ntp/dist/sntp/libevent/test/test.sh patch external/bsd/ntp/dist/sntp/libevent/test/tinytest.c patch external/bsd/ntp/dist/sntp/libevent/test/tinytest.h patch external/bsd/ntp/dist/sntp/libevent/test/tinytest_demo.c patch external/bsd/ntp/dist/sntp/libevent/test/tinytest_local.h patch external/bsd/ntp/dist/sntp/libevent/test/tinytest_macros.h patch external/bsd/ntp/dist/sntp/libopts/COPYING.gplv3 patch external/bsd/ntp/dist/sntp/libopts/COPYING.lgplv3 patch external/bsd/ntp/dist/sntp/libopts/Makefile.am patch external/bsd/ntp/dist/sntp/libopts/Makefile.in patch external/bsd/ntp/dist/sntp/libopts/README patch external/bsd/ntp/dist/sntp/libopts/ag-char-map.h patch external/bsd/ntp/dist/sntp/libopts/alias.c patch external/bsd/ntp/dist/sntp/libopts/ao-strs.c patch external/bsd/ntp/dist/sntp/libopts/ao-strs.h patch external/bsd/ntp/dist/sntp/libopts/autoopts.c patch external/bsd/ntp/dist/sntp/libopts/autoopts.h patch external/bsd/ntp/dist/sntp/libopts/boolean.c patch external/bsd/ntp/dist/sntp/libopts/check.c patch external/bsd/ntp/dist/sntp/libopts/configfile.c patch external/bsd/ntp/dist/sntp/libopts/cook.c patch external/bsd/ntp/dist/sntp/libopts/enum.c patch external/bsd/ntp/dist/sntp/libopts/env.c patch external/bsd/ntp/dist/sntp/libopts/file.c patch external/bsd/ntp/dist/sntp/libopts/find.c patch external/bsd/ntp/dist/sntp/libopts/genshell.c patch external/bsd/ntp/dist/sntp/libopts/genshell.h patch external/bsd/ntp/dist/sntp/libopts/gettext.h patch external/bsd/ntp/dist/sntp/libopts/init.c patch external/bsd/ntp/dist/sntp/libopts/intprops.h patch external/bsd/ntp/dist/sntp/libopts/libopts.c patch external/bsd/ntp/dist/sntp/libopts/load.c patch external/bsd/ntp/dist/sntp/libopts/makeshell.c patch external/bsd/ntp/dist/sntp/libopts/nested.c patch external/bsd/ntp/dist/sntp/libopts/numeric.c patch external/bsd/ntp/dist/sntp/libopts/option-value-type.c patch external/bsd/ntp/dist/sntp/libopts/option-value-type.h patch external/bsd/ntp/dist/sntp/libopts/option-xat-attribute.c patch external/bsd/ntp/dist/sntp/libopts/option-xat-attribute.h patch external/bsd/ntp/dist/sntp/libopts/parse-duration.c patch external/bsd/ntp/dist/sntp/libopts/parse-duration.h patch external/bsd/ntp/dist/sntp/libopts/pgusage.c patch external/bsd/ntp/dist/sntp/libopts/proto.h patch external/bsd/ntp/dist/sntp/libopts/putshell.c patch external/bsd/ntp/dist/sntp/libopts/reset.c patch external/bsd/ntp/dist/sntp/libopts/restore.c patch external/bsd/ntp/dist/sntp/libopts/save.c patch external/bsd/ntp/dist/sntp/libopts/sort.c patch external/bsd/ntp/dist/sntp/libopts/stack.c patch external/bsd/ntp/dist/sntp/libopts/stdnoreturn.in.h patch external/bsd/ntp/dist/sntp/libopts/streqvcmp.c patch external/bsd/ntp/dist/sntp/libopts/text_mmap.c patch external/bsd/ntp/dist/sntp/libopts/time.c patch external/bsd/ntp/dist/sntp/libopts/tokenize.c patch external/bsd/ntp/dist/sntp/libopts/usage.c patch external/bsd/ntp/dist/sntp/libopts/version.c patch external/bsd/ntp/dist/sntp/libopts/autoopts/options.h patch external/bsd/ntp/dist/sntp/libopts/autoopts/project.h patch external/bsd/ntp/dist/sntp/libopts/autoopts/usage-txt.h patch external/bsd/ntp/dist/sntp/libopts/compat/_Noreturn.h patch external/bsd/ntp/dist/sntp/libopts/compat/compat.h patch external/bsd/ntp/dist/sntp/libopts/compat/pathfind.c patch external/bsd/ntp/dist/sntp/libopts/compat/snprintf.c patch external/bsd/ntp/dist/sntp/libopts/compat/strchr.c patch external/bsd/ntp/dist/sntp/libopts/compat/strdup.c patch external/bsd/ntp/dist/sntp/libopts/compat/windows-config.h patch external/bsd/ntp/dist/sntp/libopts/m4/libopts.m4 patch external/bsd/ntp/dist/sntp/libopts/m4/liboptschk.m4 patch external/bsd/ntp/dist/sntp/libopts/m4/stdnoreturn.m4 patch external/bsd/ntp/dist/sntp/loc/README patch external/bsd/ntp/dist/sntp/loc/darwin patch external/bsd/ntp/dist/sntp/loc/debian patch external/bsd/ntp/dist/sntp/loc/freebsd patch external/bsd/ntp/dist/sntp/loc/legacy patch external/bsd/ntp/dist/sntp/loc/netbsd patch external/bsd/ntp/dist/sntp/loc/redhat patch external/bsd/ntp/dist/sntp/loc/solaris patch external/bsd/ntp/dist/sntp/m4/ntp_crypto_rand.m4 patch external/bsd/ntp/dist/sntp/m4/ntp_dir_sep.m4 patch external/bsd/ntp/dist/sntp/m4/ntp_libevent.m4 patch external/bsd/ntp/dist/sntp/m4/ntp_libntp.m4 patch external/bsd/ntp/dist/sntp/m4/ntp_locinfo.m4 patch external/bsd/ntp/dist/sntp/m4/version.m4 patch external/bsd/ntp/dist/sntp/scripts/Makefile.in patch external/bsd/ntp/dist/sntp/scripts/genLocInfo patch external/bsd/ntp/dist/sntp/tests/Makefile.in patch external/bsd/ntp/dist/sntp/tests/fileHandlingTest.h patch external/bsd/ntp/dist/sntp/tests/sntptest.h patch external/bsd/ntp/dist/tests/Makefile.in patch external/bsd/ntp/dist/tests/libntp/Makefile.am patch external/bsd/ntp/dist/tests/libntp/Makefile.in patch external/bsd/ntp/dist/tests/libntp/lfpfunc.cpp patch external/bsd/ntp/dist/tests/libntp/lfptest.h patch external/bsd/ntp/dist/tests/libntp/libntptest.h patch external/bsd/ntp/dist/tests/libntp/sockaddrtest.h patch external/bsd/ntp/dist/tests/libntp/timestructs.h patch external/bsd/ntp/dist/tests/libntp/vi64ops.cpp patch external/bsd/ntp/dist/tests/ntpd/Makefile.in patch external/bsd/ntp/dist/tests/ntpd/leapsec.cpp patch external/bsd/ntp/dist/tests/ntpd/ntpdtest.h patch external/bsd/ntp/dist/util/Makefile.am patch external/bsd/ntp/dist/util/Makefile.in patch external/bsd/ntp/dist/util/audio-pcm.c patch external/bsd/ntp/dist/util/byteorder.c patch external/bsd/ntp/dist/util/hist.c patch external/bsd/ntp/dist/util/invoke-ntp-keygen.texi patch external/bsd/ntp/dist/util/jitter.c patch external/bsd/ntp/dist/util/jitter.h patch external/bsd/ntp/dist/util/kern.c patch external/bsd/ntp/dist/util/longsize.c patch external/bsd/ntp/dist/util/ntp-keygen-opts.c patch external/bsd/ntp/dist/util/ntp-keygen-opts.def patch external/bsd/ntp/dist/util/ntp-keygen-opts.h patch external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman patch external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc patch external/bsd/ntp/dist/util/ntp-keygen.c patch external/bsd/ntp/dist/util/ntp-keygen.html patch external/bsd/ntp/dist/util/ntp-keygen.man.in patch external/bsd/ntp/dist/util/ntp-keygen.mdoc.in patch external/bsd/ntp/dist/util/ntptime.c patch external/bsd/ntp/dist/util/pps-api.c patch external/bsd/ntp/dist/util/precision.c patch external/bsd/ntp/dist/util/sht.c patch external/bsd/ntp/dist/util/testrs6000.c patch external/bsd/ntp/dist/util/tg.c patch external/bsd/ntp/dist/util/tg2.c patch external/bsd/ntp/dist/util/tickadj.c patch external/bsd/ntp/dist/util/timetrim.c patch external/bsd/ntp/include/config.h patch external/bsd/ntp/lib/libiscntp/Makefile patch external/bsd/ntp/lib/libntp/Makefile patch external/bsd/ntp/lib/libopts/Makefile patch external/bsd/ntp/scripts/mkver patch Update ntp to version 4.2.8. [christos, ticket #351] @ text @d1048 1 a1048 1 Currently, eight kinds of a1581 12 It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. d2369 2 a2370 2 .Cm mode7 | monitor | .Cm ntp | Cm stats d2377 2 a2378 2 .Cm mode7 | monitor | .Cm ntp | Cm stats a2413 13 .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. d2432 11 d2779 1 @ 1.1.1.1.6.2 log @Pull up following revision(s) (requested by christos in ticket #682): external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.5 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.5 external/bsd/ntp/dist/CommitLog: up to 1.1.1.5 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/NEWS: up to 1.1.1.5 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.5 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/build: up to 1.1.1.5 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/config.h.in: up to 1.1.1.5 external/bsd/ntp/dist/configure: up to 1.1.1.5 external/bsd/ntp/dist/configure.ac: up to 1.1.1.5 external/bsd/ntp/dist/html/build.html: up to 1.1.1.4 external/bsd/ntp/dist/html/confopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/copyright.html: up to 1.1.1.5 external/bsd/ntp/dist/html/drivers/driver28.html: up to 1.1.1.4 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/sntp.html: up to 1.1.1.4 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/include/binio.h: up to 1.3 external/bsd/ntp/dist/include/isc/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/include/mbg_gps166.h: up to 1.3 external/bsd/ntp/dist/include/ntp.h: up to 1.3 external/bsd/ntp/dist/include/ntp_calendar.h: up to 1.3 external/bsd/ntp/dist/include/ntp_fp.h: up to 1.6 external/bsd/ntp/dist/include/ntp_md5.h: up to 1.3 external/bsd/ntp/dist/include/ntpd.h: up to 1.6 external/bsd/ntp/dist/include/parse.h: up to 1.3 external/bsd/ntp/dist/include/parse_conf.h: up to 1.3 external/bsd/ntp/dist/include/timepps-Solaris.h: up to 1.3 external/bsd/ntp/dist/kernel/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/kernel/sys/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/kernel/sys/parsestreams.h: up to 1.3 external/bsd/ntp/dist/lib/isc/include/isc/backtrace.h: up to 1.3 external/bsd/ntp/dist/lib/isc/include/isc/socket.h: up to 1.3 external/bsd/ntp/dist/lib/isc/inet_ntop.c: up to 1.5 external/bsd/ntp/dist/lib/isc/log.c: up to 1.5 external/bsd/ntp/dist/lib/isc/result.c: up to 1.5 external/bsd/ntp/dist/lib/isc/unix/file.c: up to 1.5 external/bsd/ntp/dist/lib/isc/unix/ifiter_getifaddrs.c: up to 1.5 external/bsd/ntp/dist/lib/isc/unix/ifiter_ioctl.c: up to 1.3 external/bsd/ntp/dist/lib/isc/unix/net.c: up to 1.6 external/bsd/ntp/dist/libjsmn/jsmn.c: up to 1.3 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/libntp/audio.c: up to 1.7 external/bsd/ntp/dist/libntp/ntp_calendar.c: up to 1.5 external/bsd/ntp/dist/libntp/ntp_crypto_rnd.c: up to 1.3 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.4 external/bsd/ntp/dist/libparse/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/libparse/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/libparse/clk_computime.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_dcf7000.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_meinberg.c: up to 1.4 external/bsd/ntp/dist/libparse/clk_rawdcf.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_rcc8000.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_schmid.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_sel240x.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_trimtaip.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_trimtsip.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_varitext.c: up to 1.3 external/bsd/ntp/dist/libparse/clk_wharton.c: up to 1.3 external/bsd/ntp/dist/libparse/data_mbg.c: up to 1.6 external/bsd/ntp/dist/libparse/gpstolfp.c: up to 1.3 external/bsd/ntp/dist/libparse/info_trimble.c: up to 1.5 external/bsd/ntp/dist/libparse/mkinfo_rcmd.sed: up to 1.1.1.3 external/bsd/ntp/dist/libparse/mkinfo_scmd.sed: up to 1.1.1.3 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external/bsd/ntp/dist/sntp/loc/legacy: up to 1.1.1.3 external/bsd/ntp/dist/sntp/loc/netbsd: up to 1.1.1.3 external/bsd/ntp/dist/sntp/loc/solaris: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/ax_c99_struct_init.m4: up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/hms_search_lib.m4: up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ntp_compiler.m4: up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ntp_libevent.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/ntp_libntp.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/ntp_locinfo.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/openldap-thread-check.m4: up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/openldap.m4: up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/version.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/main.c: up to 1.12 external/bsd/ntp/dist/sntp/networking.c: up to 1.10 external/bsd/ntp/dist/sntp/scripts/Makefile.in: up to 1.1.1.3 external/bsd/ntp/dist/sntp/scripts/cvo.sh: up to 1.1.1.2 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.4 external/bsd/ntp/dist/sntp/sntp-opts.def: up to 1.1.1.5 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.3 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.3 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.3 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.5 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.3 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/Makefile.in: up to 1.1.1.3 external/bsd/ntp/dist/tests/Makefile.in: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/Makefile.in: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.3 external/bsd/ntp/dist/util/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/util/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.3 external/bsd/ntp/dist/util/jitter.c: up to 1.3 external/bsd/ntp/dist/util/jitter.h: delete external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.8 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.3 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.3 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.3 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.7 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.3 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.3 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.3 external/bsd/ntp/importdate: up to 1.5 external/bsd/ntp/include/config.h: up to 1.11 external/bsd/ntp/ntp2netbsd: up to 1.5 external/bsd/ntp/scripts/mkver: up to 1.6 Update ntp to 4.2.8p2 @ text @a406 14 .It Ic mdnstries Ar number If we are participating in mDNS, after we have synched for the first time we attempt to register with the mDNS system. If that registration attempt fails, we try again at one minute intervals for up to .Ic mdnstries times. After all, .Ic ntpd may be starting before mDNS. The default value for .Ic mdnstries is 5. d2609 1 a2609 3 .Cm step Ar step | .Cm stepback Ar stepback | .Cm stepfwd Ar stepfwd | a2668 13 .It Cm stepback Ar stepback The argument is the step threshold for the backward direction, which by default is 0.128 s. It can be set to any positive number in seconds. If both the forward and backward step thresholds are set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if each direction of step threshold are either set to zero or greater than .5 second. .It Cm stepfwd Ar stepfwd As for stepback, but for the forward direction. @ 1.1.1.1.6.2.2.1 log @Pull up following revisions (requested by christos in ticket #1024): doc/3RDPARTY patch external/bsd/ntp/dist/tests/libntp/atoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/atouint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/authkeys.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/buftvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/calendar.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/caljulian.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/caltontp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/calyearstart.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/clocktime.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/decodenetnum.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/lfptest.c up to 1.1.1.1 external/bsd/ntp/dist/tests/libntp/sockaddrtest.c up to 1.1.1.1 external/bsd/ntp/dist/tests/libntp/hextolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/humandate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/lfpfunc.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/lfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/modetoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/msyslog.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/netof.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/numtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/numtohost.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/octtoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/prettydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/recvbuff.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/refidsmear.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/refnumtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-a_md5encrypt.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-atoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/socktoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ssl_init.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/statestr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/strtolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/test-libntp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timevalops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tstotv.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/uglydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/vi64ops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ymd2yd.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-netof.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/a_md5encrypt.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-msyslog.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/hextoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-atouint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-authkeys.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-buftvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-calendar.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-caljulian.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-caltontp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-calyearstart.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-clocktime.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-decodenetnum.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-hextoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-hextolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-humandate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-lfpfunc.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-lfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-modetoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-numtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-numtohost.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-octtoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-prettydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-recvbuff.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-refidsmear.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-refnumtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-sfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-socktoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-ssl_init.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-statestr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-strtolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-timespecops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-timevalops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-tstotv.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-tvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-uglydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-vi64ops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-ymd2yd.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/sfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/test-libntp.h up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timespecops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/rc_cmdlength.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-leapsec.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/leapsec.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntp_prio_q.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntp_restrict.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_prio_q.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_restrict.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-rc_cmdlength.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_scanner.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_signd.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_scanner.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_signd.c up to 1.1.1.1 external/bsd/ntp/dist/tests/bug-2803/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/bug-2803/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/tests/bug-2803/bug-2803.c up to 1.1.1.2 external/bsd/ntp/dist/tests/bug-2803/run-bug-2803.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/bug-2803.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/modetoa.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/run-modetoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-uglydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-ut-2803.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/smeartest.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/uglydate.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/ut-2803.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/run-sec-2853.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sec-2853/sec-2853.c up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpq/Makefile.am up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/Makefile.in up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/run-t-ntpq.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/t-ntpq.c up to 1.1.1.1 external/bsd/ntp/dist/libjsmn/example/jsondump.c up to 1.1.1.2 external/bsd/ntp/dist/libjsmn/example/simple.c up to 1.1.1.2 external/bsd/ntp/dist/README.leapsmear up to 1.1.1.1 external/bsd/ntp/dist/html/drivers/driver40-ja.html up to 1.1.1.1 external/bsd/ntp/dist/include/refidsmear.h up to 1.1.1.2 external/bsd/ntp/dist/include/rc_cmdlength.h up to 1.1.1.1 external/bsd/ntp/dist/libntp/refidsmear.c up to 1.1.1.2 external/bsd/ntp/dist/ntpd/rc_cmdlength.c up to 1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.in up to 1.1.1.1 external/bsd/ntp/dist/scripts/update-leap/update-leap.sh up to 1.1.1.1 external/bsd/ntp/dist/sntp/libevent/build-aux/ar-lib up to 1.1.1.1 external/bsd/ntp/dist/sntp/libevent/build-aux/test-driver up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/ntp_unitytest.m4 up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/ntp_problemtests.m4 up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/run-t-log.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/kodFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/packetHandling.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/packetProcessing.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-crypto.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-keyFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/sntptest.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/networking.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/tests/crypto.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/fileHandlingTest.h.in up to 1.1.1.2 external/bsd/ntp/dist/sntp/tests/t-log.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/keyFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/kodDatabase.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-kodDatabase.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-kodFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-networking.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-packetHandling.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-packetProcessing.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-utilities.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/utilities.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/fileHandlingTest.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/libpkgver/colcomp.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/libpkgver/pkgver.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/version.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/auto/colour_prompt.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/colour_reporter.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/generate_config.yml up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/generate_module.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/generate_test_runner.rb up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/auto/runner_maybe.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/auto/test_file_filter.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/unity_test_summary.rb up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/auto/parseOutput.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/type_sanitizer.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/unity_test_summary.py up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/unity.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_fixture.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_fixture.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_fixture_internals.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_fixture_malloc_overrides.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_internals.h up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/unity_config.h up to 1.1.1.1 external/bsd/ntp/dist/scripts/update-leap/update-leap delete external/bsd/ntp/dist/sntp/tests_main.cpp delete external/bsd/ntp/dist/sntp/tests_main.h delete external/bsd/ntp/dist/sntp/libevent/sample/dns-example.c delete external/bsd/ntp/dist/sntp/libevent/sample/event-read-fifo.c delete external/bsd/ntp/dist/sntp/libevent/sample/hello-world.c delete external/bsd/ntp/dist/sntp/libevent/sample/hostcheck.c delete external/bsd/ntp/dist/sntp/libevent/sample/hostcheck.h delete external/bsd/ntp/dist/sntp/libevent/sample/http-server.c delete external/bsd/ntp/dist/sntp/libevent/sample/https-client.c delete external/bsd/ntp/dist/sntp/libevent/sample/include.am delete external/bsd/ntp/dist/sntp/libevent/sample/le-proxy.c delete external/bsd/ntp/dist/sntp/libevent/sample/openssl_hostname_validation.c delete external/bsd/ntp/dist/sntp/libevent/sample/openssl_hostname_validation.h delete external/bsd/ntp/dist/sntp/libevent/sample/signal-test.c delete external/bsd/ntp/dist/sntp/libevent/sample/time-test.c delete external/bsd/ntp/dist/sntp/tests/crypto.cpp delete external/bsd/ntp/dist/sntp/tests/fileHandlingTest.h delete external/bsd/ntp/dist/sntp/tests/keyFile.cpp delete external/bsd/ntp/dist/sntp/tests/kodDatabase.cpp delete external/bsd/ntp/dist/sntp/tests/kodFile.cpp delete external/bsd/ntp/dist/sntp/tests/networking.cpp delete external/bsd/ntp/dist/sntp/tests/packetHandling.cpp delete external/bsd/ntp/dist/sntp/tests/packetProcessing.cpp delete external/bsd/ntp/dist/sntp/tests/utilities.cpp delete external/bsd/ntp/dist/tests/libntp/a_md5encrypt.cpp delete 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external/bsd/ntp/dist/sntp/libevent/test/regress_minheap.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/test-ratelim.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/test-time.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/COPYING.gplv3 up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/COPYING.lgplv3 up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/COPYING.mbsd up to 1.1.1.2 external/bsd/ntp/dist/sntp/libopts/Makefile.in up to 1.1.1.7 external/bsd/ntp/dist/sntp/libopts/README up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/ag-char-map.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/alias.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/ao-strs.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/ao-strs.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/autoopts.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/autoopts.h up to 1.9 external/bsd/ntp/dist/sntp/libopts/boolean.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/check.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/configfile.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/cook.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/enum.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/env.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/file.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/find.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/genshell.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/gettext.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/init.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/intprops.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/libopts.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/load.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/makeshell.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/nested.c up to 1.8 external/bsd/ntp/dist/sntp/libopts/numeric.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/option-value-type.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/option-value-type.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/option-xat-attribute.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/option-xat-attribute.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/parse-duration.c up to 1.7 external/bsd/ntp/dist/sntp/libopts/parse-duration.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/pgusage.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/proto.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/putshell.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/reset.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/restore.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/save.c up to 1.8 external/bsd/ntp/dist/sntp/libopts/sort.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/stack.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/stdnoreturn.in.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/streqvcmp.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/text_mmap.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/time.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/tokenize.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/usage.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/version.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/autoopts/options.h up to 1.10 external/bsd/ntp/dist/sntp/libopts/autoopts/project.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/autoopts/usage-txt.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/compat/compat.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/compat/pathfind.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/compat/windows-config.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/m4/libopts.m4 up to 1.1.1.6 external/bsd/ntp/dist/sntp/libopts/m4/liboptschk.m4 up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/m4/stdnoreturn.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ltversion.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ntp_libevent.m4 up to 1.1.1.4 external/bsd/ntp/dist/sntp/m4/ntp_libntp.m4 up to 1.1.1.5 external/bsd/ntp/dist/sntp/m4/ntp_openssl.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ntp_rlimit.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/openldap-thread-check.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/os_cflags.m4 up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/version.m4 up to 1.1.1.5 external/bsd/ntp/dist/sntp/scripts/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/scripts/genLocInfo up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/Makefile.am up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/tests/sntptest.h up to 1.4 external/bsd/ntp/dist/tests/Makefile.am up to 1.1.1.3 external/bsd/ntp/dist/tests/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/Makefile.am up to 1.1.1.4 external/bsd/ntp/dist/tests/libntp/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/lfptest.h up to 1.4 external/bsd/ntp/dist/tests/libntp/sockaddrtest.h up to 1.4 external/bsd/ntp/dist/tests/ntpd/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/ntpd/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/util/Makefile.in up to 1.1.1.7 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen-opts.c up to 1.10 external/bsd/ntp/dist/util/ntp-keygen-opts.h up to 1.5 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.c up to 1.9 external/bsd/ntp/dist/util/ntp-keygen.html up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.man.in up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in up to 1.1.1.5 external/bsd/ntp/dist/util/ntptime.c up to 1.7 external/bsd/ntp/include/config.h up to 1.13 external/bsd/ntp/scripts/mkver up to 1.7 Update ntp to 4.2.8p4. [christos, ticket #1024] @ text @d1908 1 a1908 1 .Xr sntp 1sntpmdoc d2000 1 a2000 1 The clustering algorithm repeatedly casts out outlier a2390 3 .It Ic dscp Ar value This option specifies the Differentiated Services Control Point (DSCP) value, a 6-bit code. The default value is 46, signifying Expedited Forwarding. a2489 13 .It Ic leapsmearinterval Ar seconds This EXPERIMENTAL option is only available if .Xr ntpd 1ntpdmdoc was built with the .Cm --enable-leap-smear option to the .Cm configure script. It specifies the interval over which a leap second correction will be applied. Recommended values for this option are between 7200 (2 hours) and 86400 (24 hours). .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS! See http://bugs.ntp.org/2855 for more information. d2714 2 a2715 3 Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful d2719 1 a2719 3 The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". d2722 2 a2726 2 .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.1.6.2.2.2 log @Pull up following revision(s) (requested by snj in ticket #1166): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.15 via patch external/bsd/ntp/bin/ntpd/Makefile: up to 1.21 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.9 external/bsd/ntp/dist/CommitLog: up to 1.1.1.9 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.8 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/NEWS: up to 1.1.1.9 external/bsd/ntp/dist/README.pullrequests: up to 1.1.1.1 external/bsd/ntp/dist/config.h.in: up to 1.1.1.8 external/bsd/ntp/dist/configure: up to 1.1.1.9 external/bsd/ntp/dist/configure.ac: up to 1.1.1.8 external/bsd/ntp/dist/html/authentic.html: up to 1.1.1.3 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.8 external/bsd/ntp/dist/html/monopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/xleave.html: up to 1.1.1.4 external/bsd/ntp/dist/include/Makefile.am: up to 1.1.1.8 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/include/ntp.h: up to 1.6 external/bsd/ntp/dist/include/ntp_io.h: up to 1.5 external/bsd/ntp/dist/include/ntp_keyacc.h: up to 1.1.1.1 external/bsd/ntp/dist/include/ntp_refclock.h: up to 1.5 external/bsd/ntp/dist/include/ntp_stdlib.h: up to 1.13 external/bsd/ntp/dist/include/ntp_types.h: up to 1.6 external/bsd/ntp/dist/include/ntp_worker.h: up to 1.5 external/bsd/ntp/dist/include/ntpd.h: up to 1.8 external/bsd/ntp/dist/include/parse.h: up to 1.6 external/bsd/ntp/dist/include/recvbuff.h: up to 1.5 external/bsd/ntp/dist/include/safecast.h: up to 1.1.1.2 external/bsd/ntp/dist/install-sh delete external/bsd/ntp/dist/lib/isc/backtrace.c: up to 1.6 external/bsd/ntp/dist/lib/isc/buffer.c: up to 1.4 external/bsd/ntp/dist/lib/isc/hmacmd5.c: up to 1.5 external/bsd/ntp/dist/lib/isc/hmacsha.c: up to 1.5 external/bsd/ntp/dist/lib/isc/include/isc/string.h: up to 1.5 external/bsd/ntp/dist/lib/isc/inet_aton.c: up to 1.4 external/bsd/ntp/dist/lib/isc/inet_pton.c: up to 1.7 external/bsd/ntp/dist/lib/isc/log.c: up to 1.7 external/bsd/ntp/dist/lib/isc/netaddr.c: up to 1.9 external/bsd/ntp/dist/lib/isc/sockaddr.c: up to 1.7 external/bsd/ntp/dist/lib/isc/task.c: up to 1.4 external/bsd/ntp/dist/lib/isc/tsmemcmp.c: up to 1.1.1.1 external/bsd/ntp/dist/lib/isc/win32/interfaceiter.c: up to 1.4 external/bsd/ntp/dist/lib/isc/win32/net.c: up to 1.4 external/bsd/ntp/dist/libntp/Makefile.am: up to 1.1.1.6 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.5 external/bsd/ntp/dist/libntp/atolfp.c: up to 1.8 external/bsd/ntp/dist/libntp/authkeys.c: up to 1.10 external/bsd/ntp/dist/libntp/authreadkeys.c: up to 1.9 external/bsd/ntp/dist/libntp/authusekey.c: up to 1.5 external/bsd/ntp/dist/libntp/dolfptoa.c: up to 1.4 external/bsd/ntp/dist/libntp/hextolfp.c: up to 1.7 external/bsd/ntp/dist/libntp/is_ip_address.c: up to 1.1.1.1 external/bsd/ntp/dist/libntp/mstolfp.c: up to 1.7 external/bsd/ntp/dist/libntp/msyslog.c: up to 1.5 external/bsd/ntp/dist/libntp/ntp_crypto_rnd.c: up to 1.5 external/bsd/ntp/dist/libntp/ntp_intres.c: up to 1.9 external/bsd/ntp/dist/libntp/ntp_lineedit.c: up to 1.9 external/bsd/ntp/dist/libntp/ntp_rfc2553.c: up to 1.5 external/bsd/ntp/dist/libntp/ntp_worker.c: up to 1.6 external/bsd/ntp/dist/libntp/recvbuff.c: up to 1.6 external/bsd/ntp/dist/libntp/snprintf.c: up to 1.4 external/bsd/ntp/dist/libntp/socktohost.c: up to 1.5 external/bsd/ntp/dist/libntp/systime.c: up to 1.5 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.9 external/bsd/ntp/dist/libntp/work_thread.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_computime.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_dcf7000.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_meinberg.c: up to 1.6 external/bsd/ntp/dist/libparse/clk_rawdcf.c: up to 1.7 external/bsd/ntp/dist/libparse/clk_rcc8000.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_schmid.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_trimtaip.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_varitext.c: up to 1.5 external/bsd/ntp/dist/libparse/clk_wharton.c: up to 1.5 external/bsd/ntp/dist/libparse/parse.c: up to 1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to 1.1.1.6 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.def: up to 1.1.1.3 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp_config.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_control.c: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_crypto.c: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_io.c: up to 1.22 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_loopfilter.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.13 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp_request.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_restrict.c: up to 1.8 external/bsd/ntp/dist/ntpd/ntp_signd.c: up to 1.4 external/bsd/ntp/dist/ntpd/ntp_timer.c: up to 1.7 external/bsd/ntp/dist/ntpd/ntp_util.c: up to 1.8 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.7 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.10 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.c: up to 1.13 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/refclock_chu.c: up to 1.9 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.9 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to 1.10 external/bsd/ntp/dist/ntpd/refclock_local.c: up to 1.5 external/bsd/ntp/dist/ntpd/refclock_parse.c: up to 1.18 external/bsd/ntp/dist/ntpd/refclock_shm.c: up to 1.8 external/bsd/ntp/dist/ntpd/refclock_true.c: up to 1.6 external/bsd/ntp/dist/ntpd/refclock_tsyncpci.c: up to 1.4 external/bsd/ntp/dist/ntpdate/ntpdate.c: up to 1.10 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.7 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external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.7 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.7 external/bsd/ntp/importdate: up to 1.9 external/bsd/ntp/include/config.h: up to 1.16 external/bsd/ntp/lib/libiscntp/Makefile: up to 1.14 external/bsd/ntp/lib/libntp/Makefile: up to 1.18 external/bsd/ntp/scripts/mkver: up to 1.10 Update ntp to 4.2.8p7. @ text @d116 2 a117 8 In a few cases, including the .Cm reslist billboard generated by .Xr ntpq 1ntpqmdoc or .Xr ntpdc 1ntpdcmdoc , IPv6 addresses are automatically generated. a151 1 .Op Cm true a158 2 .Op Cm true .Op Cm xleave a165 1 .Op Cm xleave d291 1 a291 3 can be changed with the .Ic calldelay command to allow d302 1 a302 3 changed with the .Ic calldelay command to allow a334 5 .It Cm preempt Says the association can be preempted. .It Cm true Marks the server as a truechimer. Use this option only for testing. a346 5 .It Cm true Forces the association to always survive the selection and clustering algorithms. This option should almost certainly .Em only be used while testing an association. a364 6 .It Cm xleave Valid in .Cm peer and .Cm broadcast modes only, this flag enables interleave mode. d510 1 a510 1 program running on d700 1 a700 1 includes the source and destination IP addresses in message digest d898 2 a899 2 Specifies the location of the optional IFF parameters file. This overrides the link d909 2 a910 1 This overrides the link d1051 1 a1051 1 directory of the source code distribution. d1385 1 a1385 3 and the pid of the .Xr ntpd 1ntpdmdoc server process. d1428 1 a1428 3 included in the restrict list created by the .Ic restrict command d1438 1 a1438 1 an indefinite period. d1440 1 a1440 1 for an indefinite period, the only way at present to remove d1498 1 a1498 3 The .Ic monitor subcommand specifies the probability of discard d1557 1 a1557 3 in the .Ic discard command. d1617 1 a1617 3 The trap service is a subsystem of the .Xr ntpq 1ntpqmdoc control message d1684 2 a1685 5 using the .Ic manycastclient command, which is similar to the .Ic server command but with a multicast (IPv4 class d1755 1 a1755 3 set at the minimum hops specified by the .Ic ttl command. d2393 1 a2393 2 a 6-bit code. The default value is 46, signifying Expedited Forwarding. d2398 2 a2399 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early d2406 2 a2407 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early a2480 61 .It Cm unpeer_crypto_early By default, if .Xr ntpd 1ntpdmdoc receives an autokey packet that fails TEST9, a crypto failure, the association is immediately cleared. This is almost certainly a feature, but if, in spite of the current recommendation of not using autokey, you are .B still using autokey .B and you are seeing this sort of DoS attack disabling this flag will delay tearing down the association until the reachability counter becomes zero. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_crypto_nak_early By default, if .Xr ntpd 1ntpdmdoc receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the association is immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_digest_early By default, if .Xr ntpd 1ntpdmdoc receives what should be an authenticated packet that passes other packet sanity checks but contains an invalid digest the association is immediately cleared. While this is generally a feature as it allows for quick recovery, if this type of packet is carefully forged and sent during an appropriate window it can be used for a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . d2569 1 a2569 2 messages of the respective message class. Thus, a minimal log configuration d2593 1 a2593 3 This is the same operation as the .Fl l command line option. d2745 1 a2745 2 Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.1.6.2.2.3 log @doc/3RDPARTY 1.1336, 1.1337 via patch external/bsd/ntp/Makefile.inc up to 1.16 via patch external/bsd/ntp/bin/Makefile up to 1.3 external/bsd/ntp/dist/ChangeLog up to 1.1.1.10 external/bsd/ntp/dist/CommitLog up to 1.1.1.10 external/bsd/ntp/dist/NEWS up to 1.1.1.10 external/bsd/ntp/dist/configure up to 1.1.1.10 external/bsd/ntp/dist/configure.ac up to 1.1.1.9 external/bsd/ntp/dist/html/miscopt.html up to 1.1.1.9 external/bsd/ntp/dist/include/ntp.h up to 1.7 external/bsd/ntp/dist/include/ntp_md5.h up to 1.6 external/bsd/ntp/dist/libntp/a_md5encrypt.c up to 1.6 external/bsd/ntp/dist/ntpd/complete.conf.in up to 1.1.1.4 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi up to 1.1.1.8 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi up to 1.1.1.8 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi up to 1.1.1.8 external/bsd/ntp/dist/ntpd/keyword-gen-utd up to 1.1.1.6 external/bsd/ntp/dist/ntpd/keyword-gen.c up to 1.10 external/bsd/ntp/dist/ntpd/ntp.conf.5man up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.def up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.html up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.man.in up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.5man up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.html up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.man.in up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp_config.c up to 1.15 external/bsd/ntp/dist/ntpd/ntp_control.c up to 1.17 external/bsd/ntp/dist/ntpd/ntp_io.c up to 1.23 external/bsd/ntp/dist/ntpd/ntp_keyword.h up to 1.11 external/bsd/ntp/dist/ntpd/ntp_parser.y up to 1.14 external/bsd/ntp/dist/ntpd/ntp_proto.c up to 1.13 external/bsd/ntp/dist/ntpd/ntpd-opts.c up to 1.8 external/bsd/ntp/dist/ntpd/ntpd-opts.h up to 1.11 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.html up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.man.in up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/ntpd/refclock_parse.c up to 1.19 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c up to 1.8 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h up to 1.8 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.c up to 1.14 external/bsd/ntp/dist/ntpdc/ntpdc.html up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.man.in up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq-opts.c up to 1.8 external/bsd/ntp/dist/ntpq/ntpq-opts.h up to 1.8 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.c up to 1.16 external/bsd/ntp/dist/ntpq/ntpq.html up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.man.in up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c up to 1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h up to 1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/packageinfo.sh up to 1.1.1.10 external/bsd/ntp/dist/scripts/build/Makefile.am up to 1.1.1.3 external/bsd/ntp/dist/scripts/build/Makefile.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/build/genAuthors.in up to 1.1.1.1 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.html up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.man.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/invoke-calc_tickadj.texi up to 1.1.1.8 external/bsd/ntp/dist/scripts/invoke-plot_summary.texi up to 1.1.1.8 external/bsd/ntp/dist/scripts/invoke-summary.texi up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/invoke-ntp-wait.texi up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait-opts up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitman up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitmdoc up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.html up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.in up to 1.1.1.2 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.man.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/invoke-ntpsweep.texi up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/invoke-ntptrace.texi up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace-opts up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptraceman up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptracemdoc up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.html up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.man.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary-opts up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary-opts.def up to 1.1.1.3 external/bsd/ntp/dist/scripts/plot_summary.1plot_summaryman up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.1plot_summarymdoc up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.html up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.man.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/scripts/summary-opts up to 1.1.1.8 external/bsd/ntp/dist/scripts/summary.1summaryman up to 1.1.1.8 external/bsd/ntp/dist/scripts/summary.1summarymdoc up 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external/bsd/ntp/dist/sntp/include/Makefile.in up to 1.1.1.8 external/bsd/ntp/dist/sntp/include/version.def up to 1.1.1.8 external/bsd/ntp/dist/sntp/include/version.texi up to 1.1.1.8 external/bsd/ntp/dist/sntp/invoke-sntp.texi up to 1.1.1.8 external/bsd/ntp/dist/sntp/libopts/Makefile.in up to 1.1.1.10 external/bsd/ntp/dist/sntp/m4/ntp_problemtests.m4 up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/sntp_problemtests.m4 up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/version.m4 up to 1.1.1.8 external/bsd/ntp/dist/sntp/scripts/Makefile.in up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp-opts.c up to 1.9 external/bsd/ntp/dist/sntp/sntp-opts.h up to 1.8 external/bsd/ntp/dist/sntp/sntp.1sntpman up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp.html up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.man.in up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp.mdoc.in up to 1.1.1.8 external/bsd/ntp/dist/sntp/tests/Makefile.am up to 1.1.1.4 external/bsd/ntp/dist/sntp/tests/Makefile.in up to 1.1.1.8 external/bsd/ntp/dist/sntp/unity/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/version.c up to 1.1.1.7 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen-opts.c up to 1.13 external/bsd/ntp/dist/util/ntp-keygen-opts.h up to 1.8 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.html up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.man.in up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in up to 1.1.1.8 external/bsd/ntp/importdate up to 1.10 external/bsd/ntp/include/config.h up to 1.18 external/bsd/ntp/scripts/mkver up to 1.11 Update ntp to 4.2.8p8. [snj, ticket #1204] @ text @a2444 1 .Cm peer_clear_digest_early | a2453 1 .Cm peer_clear_digest_early | a2520 20 .It Cm peer_clear_digest_early By default, if .Xr ntpd 1ntpdmdoc is using autokey and it receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the peer variables are immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . @ 1.1.1.1.6.2.2.4 log @Pull up following revision(s) (requested by snj in ticket #1389): doc/3RDPARTY: 1.1380, 1.1381 external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/dist/ChangeLog: up to 1.1.1.11 external/bsd/ntp/dist/CommitLog: up to 1.1.1.11 external/bsd/ntp/dist/NEWS: up to 1.1.1.11 external/bsd/ntp/dist/configure: up to 1.1.1.11 external/bsd/ntp/dist/html/drivers/driver40-ja.html: up to 1.1.1.2 external/bsd/ntp/dist/html/drivers/driver40.html: up to 1.1.1.5 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.10 external/bsd/ntp/dist/include/Makefile.am: up to 1.1.1.9 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/include/libssl_compat.h: up to 1.1.1.1 external/bsd/ntp/dist/include/ntp.h: up to 1.8 external/bsd/ntp/dist/include/ntp_intres.h: up to 1.5 external/bsd/ntp/dist/include/ntpd.h: up to 1.9 external/bsd/ntp/dist/libntp/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.7 external/bsd/ntp/dist/libntp/audio.c: up to 1.11 external/bsd/ntp/dist/libntp/libssl_compat.c: up to 1.1.1.1 external/bsd/ntp/dist/libntp/ntp_calendar.c: up to 1.9 external/bsd/ntp/dist/libntp/ntp_intres.c: up to 1.10 external/bsd/ntp/dist/libntp/ssl_init.c: up to 1.9 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.10 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.6 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp_config.c: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_control.c: up to 1.18 external/bsd/ntp/dist/ntpd/ntp_crypto.c: up to 1.13 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_loopfilter.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.12 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.10 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to 1.11 external/bsd/ntp/dist/ntpd/refclock_jupiter.c: up to 1.11 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c: up to 1.9 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h: up to 1.9 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq-opts.c: up to 1.9 external/bsd/ntp/dist/ntpq/ntpq-opts.h: up to 1.9 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.c: up to 1.17 external/bsd/ntp/dist/ntpq/ntpq.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c: up to 1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h: up to 1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/packageinfo.sh: up to 1.1.1.11 external/bsd/ntp/dist/scripts/build/genAuthors.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/invoke-calc_tickadj.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/invoke-plot_summary.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/invoke-summary.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/invoke-ntp-wait.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/invoke-ntpsweep.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/invoke-ntptrace.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptraceman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptracemdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.1plot_summaryman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.1plot_summarymdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.1summaryman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.1summarymdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/update-leap/invoke-update-leap.texi: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap-opts: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapman: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapmdoc: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.html: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/update-leap/update-leap.man.in: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.mdoc.in: up to 1.1.1.7 external/bsd/ntp/dist/sntp/configure: up to 1.1.1.11 external/bsd/ntp/dist/sntp/crypto.c: up to 1.12 external/bsd/ntp/dist/sntp/include/version.def: up to 1.1.1.9 external/bsd/ntp/dist/sntp/include/version.texi: up to 1.1.1.9 external/bsd/ntp/dist/sntp/invoke-sntp.texi: up to 1.1.1.9 external/bsd/ntp/dist/sntp/libevent/build-aux/config.guess: up to 1.2 external/bsd/ntp/dist/sntp/libevent/build-aux/config.sub: up to 1.2 external/bsd/ntp/dist/sntp/m4/version.m4: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.10 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.9 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.11 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/tests/packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/tests/run-packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/unity/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/Makefile.in: up to 1.1.1.6 external/bsd/ntp/dist/sntp/unity/ulib_setup.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/ulib_teardown.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/unity_fixture.c: up to 1.1.1.5 external/bsd/ntp/dist/sntp/version.c: up to 1.1.1.8 external/bsd/ntp/dist/tests/libntp/a_md5encrypt.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/run-calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/sfptostr.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/ntpd/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.14 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.9 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.11 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.9 external/bsd/ntp/importdate: up to 1.11 external/bsd/ntp/include/config.h: up to 1.19 external/bsd/ntp/lib/libntp/Makefile: up to 1.19 external/bsd/ntp/lib/libopts/Makefile: up to 1.14 external/bsd/ntp/scripts/mkver: up to 1.12 Update ntp to 4.2.8p9. @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. @ 1.1.1.1.6.3 log @Pull up following revisions (requested by christos in ticket #1024): doc/3RDPARTY patch external/bsd/ntp/dist/tests/libntp/atoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/atouint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/authkeys.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/buftvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/calendar.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/caljulian.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/caltontp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/calyearstart.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/clocktime.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/decodenetnum.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/lfptest.c up to 1.1.1.1 external/bsd/ntp/dist/tests/libntp/sockaddrtest.c up to 1.1.1.1 external/bsd/ntp/dist/tests/libntp/hextolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/humandate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/lfpfunc.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/lfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/modetoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/msyslog.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/netof.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/numtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/numtohost.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/octtoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/prettydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/recvbuff.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/refidsmear.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/refnumtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-a_md5encrypt.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-atoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/socktoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ssl_init.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/statestr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/strtolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/test-libntp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timevalops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tstotv.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/uglydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/vi64ops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ymd2yd.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-netof.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/a_md5encrypt.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-msyslog.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/hextoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-atouint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-authkeys.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-buftvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-calendar.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-caljulian.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-caltontp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-calyearstart.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-clocktime.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-decodenetnum.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-hextoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-hextolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-humandate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-lfpfunc.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-lfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-modetoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-numtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-numtohost.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-octtoint.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-prettydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-recvbuff.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-refidsmear.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-refnumtoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-sfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-socktoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-ssl_init.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-statestr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-strtolfp.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-timespecops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-timevalops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-tstotv.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-tvtots.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-uglydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-vi64ops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-ymd2yd.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/sfptostr.c up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/test-libntp.h up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timespecops.c up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/rc_cmdlength.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-leapsec.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/leapsec.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntp_prio_q.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntp_restrict.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_prio_q.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_restrict.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-rc_cmdlength.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_scanner.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_signd.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_scanner.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_signd.c up to 1.1.1.1 external/bsd/ntp/dist/tests/bug-2803/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/bug-2803/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/tests/bug-2803/bug-2803.c up to 1.1.1.2 external/bsd/ntp/dist/tests/bug-2803/run-bug-2803.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/bug-2803.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/modetoa.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/run-modetoa.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-uglydate.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-ut-2803.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/smeartest.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/uglydate.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/ut-2803.c up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/run-sec-2853.c up to 1.1.1.3 external/bsd/ntp/dist/tests/sec-2853/sec-2853.c up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpq/Makefile.am up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/Makefile.in up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/run-t-ntpq.c up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/t-ntpq.c up to 1.1.1.1 external/bsd/ntp/dist/libjsmn/example/jsondump.c up to 1.1.1.2 external/bsd/ntp/dist/libjsmn/example/simple.c up to 1.1.1.2 external/bsd/ntp/dist/README.leapsmear up to 1.1.1.1 external/bsd/ntp/dist/html/drivers/driver40-ja.html up to 1.1.1.1 external/bsd/ntp/dist/include/refidsmear.h up to 1.1.1.2 external/bsd/ntp/dist/include/rc_cmdlength.h up to 1.1.1.1 external/bsd/ntp/dist/libntp/refidsmear.c up to 1.1.1.2 external/bsd/ntp/dist/ntpd/rc_cmdlength.c up to 1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.in up to 1.1.1.1 external/bsd/ntp/dist/scripts/update-leap/update-leap.sh up to 1.1.1.1 external/bsd/ntp/dist/sntp/libevent/build-aux/ar-lib up to 1.1.1.1 external/bsd/ntp/dist/sntp/libevent/build-aux/test-driver up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/ntp_unitytest.m4 up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/ntp_problemtests.m4 up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/run-t-log.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/kodFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/packetHandling.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/packetProcessing.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-crypto.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-keyFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/sntptest.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/networking.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/tests/crypto.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/fileHandlingTest.h.in up to 1.1.1.2 external/bsd/ntp/dist/sntp/tests/t-log.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/tests/keyFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/kodDatabase.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-kodDatabase.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-kodFile.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-networking.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-packetHandling.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-packetProcessing.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/run-utilities.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/utilities.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/fileHandlingTest.c up to 1.1.1.1 external/bsd/ntp/dist/sntp/libpkgver/colcomp.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/libpkgver/pkgver.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/version.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/auto/colour_prompt.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/colour_reporter.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/generate_config.yml up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/generate_module.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/generate_test_runner.rb up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/auto/runner_maybe.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/auto/test_file_filter.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/unity_test_summary.rb up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/auto/parseOutput.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/type_sanitizer.rb up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/auto/unity_test_summary.py up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/Makefile.in up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity.c up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/unity.h up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_fixture.c up to 1.1.1.2 external/bsd/ntp/dist/sntp/unity/unity_fixture.h up to 1.1.1.2 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external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.in up to 1.1.1.4 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/invoke-ntptrace.texi up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/ntptrace-opts up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptraceman up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptracemdoc up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.html up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.man.in up to 1.1.1.5 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.mdoc.in up to 1.1.1.5 external/bsd/ntp/dist/scripts/update-leap/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/scripts/update-leap/Makefile.in up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/invoke-update-leap.texi up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap-opts up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapman up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapmdoc up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.html up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.man.in up to 1.1.1.3 external/bsd/ntp/dist/scripts/update-leap/update-leap.mdoc.in up to 1.1.1.3 external/bsd/ntp/dist/sntp/Makefile.am up to 1.1.1.7 external/bsd/ntp/dist/sntp/Makefile.in up to 1.1.1.7 external/bsd/ntp/dist/sntp/aclocal.m4 up to 1.1.1.6 external/bsd/ntp/dist/sntp/config.h.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/configure up to 1.1.1.7 external/bsd/ntp/dist/sntp/configure.ac up to 1.1.1.6 external/bsd/ntp/dist/sntp/invoke-sntp.texi up to 1.1.1.5 external/bsd/ntp/dist/sntp/kod_management.c up to 1.6 external/bsd/ntp/dist/sntp/log.c up to 1.9 external/bsd/ntp/dist/sntp/log.h up to 1.7 external/bsd/ntp/dist/sntp/networking.c up to 1.12 external/bsd/ntp/dist/sntp/sntp-opts.c up to 1.6 external/bsd/ntp/dist/sntp/sntp-opts.h up to 1.5 external/bsd/ntp/dist/sntp/sntp.1sntpman up to 1.1.1.5 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc up to 1.1.1.5 external/bsd/ntp/dist/sntp/sntp.html up to 1.1.1.7 external/bsd/ntp/dist/sntp/sntp.man.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/sntp.mdoc.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/include/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/include/autogen-version.def up to 1.1.1.3 external/bsd/ntp/dist/sntp/include/version.def up to 1.1.1.5 external/bsd/ntp/dist/sntp/include/version.texi up to 1.1.1.5 external/bsd/ntp/dist/sntp/libevent/Makefile.am up to 1.1.1.4 external/bsd/ntp/dist/sntp/libevent/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/libevent/aclocal.m4 up to 1.1.1.3 external/bsd/ntp/dist/sntp/libevent/config.h.in up to 1.1.1.4 external/bsd/ntp/dist/sntp/libevent/configure up to 1.1.1.4 external/bsd/ntp/dist/sntp/libevent/listener.c up to 1.4 external/bsd/ntp/dist/sntp/libevent/build-aux/ltmain.sh up to 1.1.1.2 external/bsd/ntp/dist/sntp/libevent/m4/ltversion.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/libevent/test/bench_httpclient.c up to 1.4 external/bsd/ntp/dist/sntp/libevent/test/regress.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/regress_dns.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/regress_http.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/regress_minheap.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/test-ratelim.c up to 1.5 external/bsd/ntp/dist/sntp/libevent/test/test-time.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/COPYING.gplv3 up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/COPYING.lgplv3 up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/COPYING.mbsd up to 1.1.1.2 external/bsd/ntp/dist/sntp/libopts/Makefile.in up to 1.1.1.7 external/bsd/ntp/dist/sntp/libopts/README up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/ag-char-map.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/alias.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/ao-strs.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/ao-strs.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/autoopts.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/autoopts.h up to 1.9 external/bsd/ntp/dist/sntp/libopts/boolean.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/check.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/configfile.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/cook.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/enum.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/env.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/file.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/find.c up to 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external/bsd/ntp/dist/sntp/libopts/putshell.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/reset.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/restore.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/save.c up to 1.8 external/bsd/ntp/dist/sntp/libopts/sort.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/stack.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/stdnoreturn.in.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/streqvcmp.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/text_mmap.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/time.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/tokenize.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/usage.c up to 1.5 external/bsd/ntp/dist/sntp/libopts/version.c up to 1.3 external/bsd/ntp/dist/sntp/libopts/autoopts/options.h up to 1.10 external/bsd/ntp/dist/sntp/libopts/autoopts/project.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/autoopts/usage-txt.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/compat/compat.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/compat/pathfind.c up to 1.6 external/bsd/ntp/dist/sntp/libopts/compat/windows-config.h up to 1.3 external/bsd/ntp/dist/sntp/libopts/m4/libopts.m4 up to 1.1.1.6 external/bsd/ntp/dist/sntp/libopts/m4/liboptschk.m4 up to 1.1.1.5 external/bsd/ntp/dist/sntp/libopts/m4/stdnoreturn.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ltversion.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ntp_libevent.m4 up to 1.1.1.4 external/bsd/ntp/dist/sntp/m4/ntp_libntp.m4 up to 1.1.1.5 external/bsd/ntp/dist/sntp/m4/ntp_openssl.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/ntp_rlimit.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/openldap-thread-check.m4 up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/os_cflags.m4 up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/version.m4 up to 1.1.1.5 external/bsd/ntp/dist/sntp/scripts/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/scripts/genLocInfo up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/Makefile.am up to 1.1.1.3 external/bsd/ntp/dist/sntp/tests/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/sntp/tests/sntptest.h up to 1.4 external/bsd/ntp/dist/tests/Makefile.am up to 1.1.1.3 external/bsd/ntp/dist/tests/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/Makefile.am up to 1.1.1.4 external/bsd/ntp/dist/tests/libntp/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/lfptest.h up to 1.4 external/bsd/ntp/dist/tests/libntp/sockaddrtest.h up to 1.4 external/bsd/ntp/dist/tests/ntpd/Makefile.am up to 1.1.1.2 external/bsd/ntp/dist/tests/ntpd/Makefile.in up to 1.1.1.5 external/bsd/ntp/dist/util/Makefile.in up to 1.1.1.7 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen-opts.c up to 1.10 external/bsd/ntp/dist/util/ntp-keygen-opts.h up to 1.5 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.c up to 1.9 external/bsd/ntp/dist/util/ntp-keygen.html up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.man.in up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in up to 1.1.1.5 external/bsd/ntp/dist/util/ntptime.c up to 1.7 external/bsd/ntp/include/config.h up to 1.13 external/bsd/ntp/scripts/mkver up to 1.7 Update ntp to 4.2.8p4. [christos, ticket #1024] @ text @d1908 1 a1908 1 .Xr sntp 1sntpmdoc d2000 1 a2000 1 The clustering algorithm repeatedly casts out outlier a2390 3 .It Ic dscp Ar value This option specifies the Differentiated Services Control Point (DSCP) value, a 6-bit code. The default value is 46, signifying Expedited Forwarding. a2489 13 .It Ic leapsmearinterval Ar seconds This EXPERIMENTAL option is only available if .Xr ntpd 1ntpdmdoc was built with the .Cm --enable-leap-smear option to the .Cm configure script. It specifies the interval over which a leap second correction will be applied. Recommended values for this option are between 7200 (2 hours) and 86400 (24 hours). .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS! See http://bugs.ntp.org/2855 for more information. d2714 2 a2715 3 Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful d2719 1 a2719 3 The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". d2722 2 a2726 2 .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.1.6.4 log @Pull up following revision(s) (requested by snj in ticket #1166): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.15 via patch external/bsd/ntp/bin/ntpd/Makefile: up to 1.21 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.9 external/bsd/ntp/dist/CommitLog: up to 1.1.1.9 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.8 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/NEWS: up to 1.1.1.9 external/bsd/ntp/dist/README.pullrequests: up to 1.1.1.1 external/bsd/ntp/dist/config.h.in: up to 1.1.1.8 external/bsd/ntp/dist/configure: up to 1.1.1.9 external/bsd/ntp/dist/configure.ac: up to 1.1.1.8 external/bsd/ntp/dist/html/authentic.html: up to 1.1.1.3 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.8 external/bsd/ntp/dist/html/monopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/xleave.html: up to 1.1.1.4 external/bsd/ntp/dist/include/Makefile.am: up to 1.1.1.8 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/include/ntp.h: up to 1.6 external/bsd/ntp/dist/include/ntp_io.h: up to 1.5 external/bsd/ntp/dist/include/ntp_keyacc.h: up to 1.1.1.1 external/bsd/ntp/dist/include/ntp_refclock.h: up to 1.5 external/bsd/ntp/dist/include/ntp_stdlib.h: up to 1.13 external/bsd/ntp/dist/include/ntp_types.h: up to 1.6 external/bsd/ntp/dist/include/ntp_worker.h: up to 1.5 external/bsd/ntp/dist/include/ntpd.h: up to 1.8 external/bsd/ntp/dist/include/parse.h: up to 1.6 external/bsd/ntp/dist/include/recvbuff.h: up to 1.5 external/bsd/ntp/dist/include/safecast.h: up to 1.1.1.2 external/bsd/ntp/dist/install-sh delete external/bsd/ntp/dist/lib/isc/backtrace.c: up to 1.6 external/bsd/ntp/dist/lib/isc/buffer.c: up to 1.4 external/bsd/ntp/dist/lib/isc/hmacmd5.c: up to 1.5 external/bsd/ntp/dist/lib/isc/hmacsha.c: up to 1.5 external/bsd/ntp/dist/lib/isc/include/isc/string.h: up to 1.5 external/bsd/ntp/dist/lib/isc/inet_aton.c: up to 1.4 external/bsd/ntp/dist/lib/isc/inet_pton.c: up to 1.7 external/bsd/ntp/dist/lib/isc/log.c: up to 1.7 external/bsd/ntp/dist/lib/isc/netaddr.c: up to 1.9 external/bsd/ntp/dist/lib/isc/sockaddr.c: up to 1.7 external/bsd/ntp/dist/lib/isc/task.c: up to 1.4 external/bsd/ntp/dist/lib/isc/tsmemcmp.c: up to 1.1.1.1 external/bsd/ntp/dist/lib/isc/win32/interfaceiter.c: up to 1.4 external/bsd/ntp/dist/lib/isc/win32/net.c: up to 1.4 external/bsd/ntp/dist/libntp/Makefile.am: up to 1.1.1.6 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.5 external/bsd/ntp/dist/libntp/atolfp.c: up to 1.8 external/bsd/ntp/dist/libntp/authkeys.c: up to 1.10 external/bsd/ntp/dist/libntp/authreadkeys.c: up to 1.9 external/bsd/ntp/dist/libntp/authusekey.c: up to 1.5 external/bsd/ntp/dist/libntp/dolfptoa.c: up to 1.4 external/bsd/ntp/dist/libntp/hextolfp.c: up to 1.7 external/bsd/ntp/dist/libntp/is_ip_address.c: up to 1.1.1.1 external/bsd/ntp/dist/libntp/mstolfp.c: up to 1.7 external/bsd/ntp/dist/libntp/msyslog.c: up 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external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.7 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.7 external/bsd/ntp/importdate: up to 1.9 external/bsd/ntp/include/config.h: up to 1.16 external/bsd/ntp/lib/libiscntp/Makefile: up to 1.14 external/bsd/ntp/lib/libntp/Makefile: up to 1.18 external/bsd/ntp/scripts/mkver: up to 1.10 Update ntp to 4.2.8p7. @ text @d116 2 a117 8 In a few cases, including the .Cm reslist billboard generated by .Xr ntpq 1ntpqmdoc or .Xr ntpdc 1ntpdcmdoc , IPv6 addresses are automatically generated. a151 1 .Op Cm true a158 2 .Op Cm true .Op Cm xleave a165 1 .Op Cm xleave d291 1 a291 3 can be changed with the .Ic calldelay command to allow d302 1 a302 3 changed with the .Ic calldelay command to allow a334 5 .It Cm preempt Says the association can be preempted. .It Cm true Marks the server as a truechimer. Use this option only for testing. a346 5 .It Cm true Forces the association to always survive the selection and clustering algorithms. This option should almost certainly .Em only be used while testing an association. a364 6 .It Cm xleave Valid in .Cm peer and .Cm broadcast modes only, this flag enables interleave mode. d510 1 a510 1 program running on d700 1 a700 1 includes the source and destination IP addresses in message digest d898 2 a899 2 Specifies the location of the optional IFF parameters file. This overrides the link d909 2 a910 1 This overrides the link d1051 1 a1051 1 directory of the source code distribution. d1385 1 a1385 3 and the pid of the .Xr ntpd 1ntpdmdoc server process. d1428 1 a1428 3 included in the restrict list created by the .Ic restrict command d1438 1 a1438 1 an indefinite period. d1440 1 a1440 1 for an indefinite period, the only way at present to remove d1498 1 a1498 3 The .Ic monitor subcommand specifies the probability of discard d1557 1 a1557 3 in the .Ic discard command. d1617 1 a1617 3 The trap service is a subsystem of the .Xr ntpq 1ntpqmdoc control message d1684 2 a1685 5 using the .Ic manycastclient command, which is similar to the .Ic server command but with a multicast (IPv4 class d1755 1 a1755 3 set at the minimum hops specified by the .Ic ttl command. d2393 1 a2393 2 a 6-bit code. The default value is 46, signifying Expedited Forwarding. d2398 2 a2399 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early d2406 2 a2407 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early a2480 61 .It Cm unpeer_crypto_early By default, if .Xr ntpd 1ntpdmdoc receives an autokey packet that fails TEST9, a crypto failure, the association is immediately cleared. This is almost certainly a feature, but if, in spite of the current recommendation of not using autokey, you are .B still using autokey .B and you are seeing this sort of DoS attack disabling this flag will delay tearing down the association until the reachability counter becomes zero. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_crypto_nak_early By default, if .Xr ntpd 1ntpdmdoc receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the association is immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_digest_early By default, if .Xr ntpd 1ntpdmdoc receives what should be an authenticated packet that passes other packet sanity checks but contains an invalid digest the association is immediately cleared. While this is generally a feature as it allows for quick recovery, if this type of packet is carefully forged and sent during an appropriate window it can be used for a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . d2569 1 a2569 2 messages of the respective message class. Thus, a minimal log configuration d2593 1 a2593 3 This is the same operation as the .Fl l command line option. d2745 1 a2745 2 Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.1.6.5 log @Pull up following revision(s) (requested by snj in ticket #1204): doc/3RDPARTY: 1.1336, 1.1337 via patch external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/bin/Makefile: up to 1.3 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.10 external/bsd/ntp/dist/CommitLog: up to 1.1.1.10 external/bsd/ntp/dist/NEWS: up to 1.1.1.10 external/bsd/ntp/dist/configure: up to 1.1.1.10 external/bsd/ntp/dist/configure.ac: up to 1.1.1.9 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.9 external/bsd/ntp/dist/include/ntp.h: up to 1.7 external/bsd/ntp/dist/include/ntp_md5.h: up to 1.6 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.6 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.4 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.6 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp_config.c: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_control.c: up to 1.17 external/bsd/ntp/dist/ntpd/ntp_io.c: up to 1.23 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to 1.11 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.13 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.8 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.11 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/refclock_parse.c: up to 1.19 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c: up to 1.8 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h: up to 1.8 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman: up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc: up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.c: up to 1.14 external/bsd/ntp/dist/ntpdc/ntpdc.html: up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.man.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi: up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq-opts.c: up to 1.8 external/bsd/ntp/dist/ntpq/ntpq-opts.h: up to 1.8 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman: up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc: up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.c: up to 1.16 external/bsd/ntp/dist/ntpq/ntpq.html: up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.man.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi: up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c: up to 1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h: up to 1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman: up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc: up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html: up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in: up to 1.1.1.8 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/packageinfo.sh: up to 1.1.1.10 external/bsd/ntp/dist/scripts/build/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/scripts/build/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/build/genAuthors.in: up to 1.1.1.1 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman: up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc: up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.html: up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.man.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/invoke-calc_tickadj.texi: up to 1.1.1.8 external/bsd/ntp/dist/scripts/invoke-plot_summary.texi: up to 1.1.1.8 external/bsd/ntp/dist/scripts/invoke-summary.texi: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/invoke-ntp-wait.texi: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait-opts: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitman: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitmdoc: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.html: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.man.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/invoke-ntpsweep.texi: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/invoke-ntptrace.texi: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace-opts: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptraceman: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptracemdoc: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.html: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.man.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary-opts: up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary-opts.def: up to 1.1.1.3 external/bsd/ntp/dist/scripts/plot_summary.1plot_summaryman: up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.1plot_summarymdoc: up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.html: up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.man.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/plot_summary.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/summary-opts: up to 1.1.1.8 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external/bsd/ntp/dist/sntp/configure: up to 1.1.1.10 external/bsd/ntp/dist/sntp/configure.ac: up to 1.1.1.7 external/bsd/ntp/dist/sntp/crypto.c: up to 1.11 external/bsd/ntp/dist/sntp/include/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/sntp/include/version.def: up to 1.1.1.8 external/bsd/ntp/dist/sntp/include/version.texi: up to 1.1.1.8 external/bsd/ntp/dist/sntp/invoke-sntp.texi: up to 1.1.1.8 external/bsd/ntp/dist/sntp/libopts/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/sntp/m4/ntp_problemtests.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/sntp_problemtests.m4: up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/version.m4: up to 1.1.1.8 external/bsd/ntp/dist/sntp/scripts/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.9 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.8 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.8 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.8 external/bsd/ntp/dist/sntp/tests/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/sntp/tests/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/sntp/unity/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/sntp/version.c: up to 1.1.1.7 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.13 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.8 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.8 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.8 external/bsd/ntp/importdate: up to 1.10 external/bsd/ntp/include/config.h: up to 1.18 external/bsd/ntp/scripts/mkver: up to 1.11 Update ntp to 4.2.8p8. @ text @a2444 1 .Cm peer_clear_digest_early | a2453 1 .Cm peer_clear_digest_early | a2520 20 .It Cm peer_clear_digest_early By default, if .Xr ntpd 1ntpdmdoc is using autokey and it receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the peer variables are immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . @ 1.1.1.1.6.6 log @Pull up following revision(s) (requested by snj in ticket #1389): doc/3RDPARTY: 1.1380, 1.1381 external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/dist/ChangeLog: up to 1.1.1.11 external/bsd/ntp/dist/CommitLog: up to 1.1.1.11 external/bsd/ntp/dist/NEWS: up to 1.1.1.11 external/bsd/ntp/dist/configure: up to 1.1.1.11 external/bsd/ntp/dist/html/drivers/driver40-ja.html: up to 1.1.1.2 external/bsd/ntp/dist/html/drivers/driver40.html: up to 1.1.1.5 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.10 external/bsd/ntp/dist/include/Makefile.am: up to 1.1.1.9 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/include/libssl_compat.h: up to 1.1.1.1 external/bsd/ntp/dist/include/ntp.h: up to 1.8 external/bsd/ntp/dist/include/ntp_intres.h: up to 1.5 external/bsd/ntp/dist/include/ntpd.h: up to 1.9 external/bsd/ntp/dist/libntp/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.7 external/bsd/ntp/dist/libntp/audio.c: up to 1.11 external/bsd/ntp/dist/libntp/libssl_compat.c: up to 1.1.1.1 external/bsd/ntp/dist/libntp/ntp_calendar.c: up to 1.9 external/bsd/ntp/dist/libntp/ntp_intres.c: up to 1.10 external/bsd/ntp/dist/libntp/ssl_init.c: up to 1.9 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.10 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.6 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp_config.c: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_control.c: up to 1.18 external/bsd/ntp/dist/ntpd/ntp_crypto.c: up to 1.13 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_loopfilter.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.12 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.10 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to 1.11 external/bsd/ntp/dist/ntpd/refclock_jupiter.c: up to 1.11 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c: up to 1.9 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h: up to 1.9 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq-opts.c: up to 1.9 external/bsd/ntp/dist/ntpq/ntpq-opts.h: up to 1.9 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.c: up to 1.17 external/bsd/ntp/dist/ntpq/ntpq.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c: up to 1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h: up to 1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/packageinfo.sh: up to 1.1.1.11 external/bsd/ntp/dist/scripts/build/genAuthors.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/invoke-calc_tickadj.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/invoke-plot_summary.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/invoke-summary.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/invoke-ntp-wait.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/invoke-ntpsweep.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/invoke-ntptrace.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptraceman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptracemdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.1plot_summaryman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.1plot_summarymdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.1summaryman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.1summarymdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/update-leap/invoke-update-leap.texi: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap-opts: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapman: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapmdoc: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.html: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/update-leap/update-leap.man.in: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.mdoc.in: up to 1.1.1.7 external/bsd/ntp/dist/sntp/configure: up to 1.1.1.11 external/bsd/ntp/dist/sntp/crypto.c: up to 1.12 external/bsd/ntp/dist/sntp/include/version.def: up to 1.1.1.9 external/bsd/ntp/dist/sntp/include/version.texi: up to 1.1.1.9 external/bsd/ntp/dist/sntp/invoke-sntp.texi: up to 1.1.1.9 external/bsd/ntp/dist/sntp/libevent/build-aux/config.guess: up to 1.2 external/bsd/ntp/dist/sntp/libevent/build-aux/config.sub: up to 1.2 external/bsd/ntp/dist/sntp/m4/version.m4: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.10 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.9 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.11 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/tests/packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/tests/run-packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/unity/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/Makefile.in: up to 1.1.1.6 external/bsd/ntp/dist/sntp/unity/ulib_setup.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/ulib_teardown.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/unity_fixture.c: up to 1.1.1.5 external/bsd/ntp/dist/sntp/version.c: up to 1.1.1.8 external/bsd/ntp/dist/tests/libntp/a_md5encrypt.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/run-calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/sfptostr.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/ntpd/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.14 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.9 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.11 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.9 external/bsd/ntp/importdate: up to 1.11 external/bsd/ntp/include/config.h: up to 1.19 external/bsd/ntp/lib/libntp/Makefile: up to 1.19 external/bsd/ntp/lib/libopts/Makefile: up to 1.14 external/bsd/ntp/scripts/mkver: up to 1.12 Update ntp to 4.2.8p9. @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. @ 1.1.1.1.6.5.4.1 log @Pull up following revision(s) (requested by snj in ticket #1389): doc/3RDPARTY: 1.1380, 1.1381 external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/dist/ChangeLog: up to 1.1.1.11 external/bsd/ntp/dist/CommitLog: up to 1.1.1.11 external/bsd/ntp/dist/NEWS: up to 1.1.1.11 external/bsd/ntp/dist/configure: up to 1.1.1.11 external/bsd/ntp/dist/html/drivers/driver40-ja.html: up to 1.1.1.2 external/bsd/ntp/dist/html/drivers/driver40.html: up to 1.1.1.5 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.10 external/bsd/ntp/dist/include/Makefile.am: up to 1.1.1.9 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/include/libssl_compat.h: up to 1.1.1.1 external/bsd/ntp/dist/include/ntp.h: up to 1.8 external/bsd/ntp/dist/include/ntp_intres.h: up to 1.5 external/bsd/ntp/dist/include/ntpd.h: up to 1.9 external/bsd/ntp/dist/libntp/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.7 external/bsd/ntp/dist/libntp/audio.c: up to 1.11 external/bsd/ntp/dist/libntp/libssl_compat.c: up to 1.1.1.1 external/bsd/ntp/dist/libntp/ntp_calendar.c: up to 1.9 external/bsd/ntp/dist/libntp/ntp_intres.c: up to 1.10 external/bsd/ntp/dist/libntp/ssl_init.c: up to 1.9 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.10 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.6 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp_config.c: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_control.c: up to 1.18 external/bsd/ntp/dist/ntpd/ntp_crypto.c: up to 1.13 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_loopfilter.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.12 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.10 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to 1.11 external/bsd/ntp/dist/ntpd/refclock_jupiter.c: up to 1.11 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c: up to 1.9 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h: up to 1.9 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq-opts.c: up to 1.9 external/bsd/ntp/dist/ntpq/ntpq-opts.h: up to 1.9 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.c: up to 1.17 external/bsd/ntp/dist/ntpq/ntpq.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c: up to 1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h: up to 1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in: up to 1.1.1.9 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/packageinfo.sh: up to 1.1.1.11 external/bsd/ntp/dist/scripts/build/genAuthors.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/invoke-calc_tickadj.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/invoke-plot_summary.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/invoke-summary.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/invoke-ntp-wait.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/invoke-ntpsweep.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/invoke-ntptrace.texi: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptraceman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.1ntptracemdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/ntptrace/ntptrace.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.1plot_summaryman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.1plot_summarymdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/plot_summary.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary-opts: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.1summaryman: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.1summarymdoc: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.html: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.man.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/summary.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/update-leap/invoke-update-leap.texi: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap-opts: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapman: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.1update-leapmdoc: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.html: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/update-leap/update-leap.man.in: up to 1.1.1.7 external/bsd/ntp/dist/scripts/update-leap/update-leap.mdoc.in: up to 1.1.1.7 external/bsd/ntp/dist/sntp/configure: up to 1.1.1.11 external/bsd/ntp/dist/sntp/crypto.c: up to 1.12 external/bsd/ntp/dist/sntp/include/version.def: up to 1.1.1.9 external/bsd/ntp/dist/sntp/include/version.texi: up to 1.1.1.9 external/bsd/ntp/dist/sntp/invoke-sntp.texi: up to 1.1.1.9 external/bsd/ntp/dist/sntp/libevent/build-aux/config.guess: up to 1.2 external/bsd/ntp/dist/sntp/libevent/build-aux/config.sub: up to 1.2 external/bsd/ntp/dist/sntp/m4/version.m4: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.10 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.9 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.11 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/tests/packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/tests/run-packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/unity/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/Makefile.in: up to 1.1.1.6 external/bsd/ntp/dist/sntp/unity/ulib_setup.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/ulib_teardown.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/unity_fixture.c: up to 1.1.1.5 external/bsd/ntp/dist/sntp/version.c: up to 1.1.1.8 external/bsd/ntp/dist/tests/libntp/a_md5encrypt.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/run-calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/sfptostr.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/ntpd/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.14 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.9 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.11 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.9 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.9 external/bsd/ntp/importdate: up to 1.11 external/bsd/ntp/include/config.h: up to 1.19 external/bsd/ntp/lib/libntp/Makefile: up to 1.19 external/bsd/ntp/lib/libopts/Makefile: up to 1.14 external/bsd/ntp/scripts/mkver: up to 1.12 Update ntp to 4.2.8p9. @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. @ 1.1.1.2 log @Import ntp 4.2.8 @ text @d1048 1 a1048 1 Currently, eight kinds of a1581 12 It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. d2369 2 a2370 2 .Cm mode7 | monitor | .Cm ntp | Cm stats d2377 2 a2378 2 .Cm mode7 | monitor | .Cm ntp | Cm stats a2413 13 .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. d2432 11 d2779 1 @ 1.1.1.3 log @--- (4.2.8p2) 2015/04/07 Released by Harlan Stenn (4.2.8p2-RC3) 2015/04/03 Released by Harlan Stenn * [Bug 2763] Fix for different thresholds for forward and backward steps. --- (4.2.8p2-RC2) 2015/04/03 Released by Harlan Stenn * [Bug 2592] FLAG_TSTAMP_PPS cleanup for refclock_parse.c. * [Bug 2769] New script: update-leap * [Bug 2769] cleannup for update-leap * [Bug 2788] New flag -G (force_step_once). * [Bug 2794] Clean up kernel clock status reports. * [Bug 2795] Cannot build without OpenSLL (on Win32). Provided a Win32 specific wrapper around libevent/arc4random.c. fixed some minor warnings. * [Bug 2796] ntp-keygen crashes in 'getclock()' on Win32. * [Bug 2797] ntp-keygen trapped in endless loop for MD5 keys on big-endian machines. * [Bug 2798] sntp should decode and display the leap indicator. * Simple cleanup to html/build.html --- (4.2.8p2-RC1) 2015/03/30 Released by Harlan Stenn * [Bug 2794] Don't let reports on normal kernel status changes look like errors. * [Bug 2788] New flag -G (force_step_once). * [Bug 2592] Account for PPS sources which can provide an accurate absolute time stamp, and status information. Fixed indention and removed trailing whitespace. * [Bug 1787] DCF77's formerly "antenna" bit is "call bit" since 2003. * [Bug 1960] setsockopt IPV6_MULTICAST_IF: Invalid argument. * [Bug 2346] "graceful termination" signals do not do peer cleanup. * [Bug 2728] See if C99-style structure initialization works. * [Bug 2747] Upgrade libevent to 2.1.5-beta. * [Bug 2749] ntp/lib/NTP/Util.pm needs update for ntpq -w, IPv6, .POOL. . * [Bug 2751] jitter.h has stale copies of l_fp macros. * [Bug 2756] ntpd hangs in startup with gcc 3.3.5 on ARM. * [Bug 2757] Quiet compiler warnings. * [Bug 2759] Expose nonvolatile/clk_wander_threshold to ntpq. * [Bug 2763] Allow different thresholds for forward and backward steps. * [Bug 2766] ntp-keygen output files should not be world-readable. * [Bug 2767] ntp-keygen -M should symlink to ntp.keys. * [Bug 2771] nonvolatile value is documented in wrong units. * [Bug 2773] Early leap announcement from Palisade/Thunderbolt * [Bug 2774] Unreasonably verbose printout - leap pending/warning * [Bug 2775] ntp-keygen.c fails to compile under Windows. * [Bug 2777] Fixed loops and decoding of Meinberg GPS satellite info. Removed non-ASCII characters from some copyright comments. Removed trailing whitespace. Updated definitions for Meinberg clocks from current Meinberg header files. Now use C99 fixed-width types and avoid non-ASCII characters in comments. Account for updated definitions pulled from Meinberg header files. Updated comments on Meinberg GPS receivers which are not only called GPS16x. Replaced some constant numbers by defines from ntp_calendar.h Modified creation of parse-specific variables for Meinberg devices in gps16x_message(). Reworked mk_utcinfo() to avoid printing of ambiguous leap second dates. Modified mbg_tm_str() which now expexts an additional parameter controlling if the time status shall be printed. * [Sec 2779] ntpd accepts unauthenticated packets with symmetric key crypto. * [Sec 2781] Authentication doesn't protect symmetric associations against DoS attacks. * [Bug 2783] Quiet autoconf warnings about missing AC_LANG_SOURCE. * [Bug 2789] Quiet compiler warnings from libevent. * [Bug 2790] If ntpd sets the Windows MM timer highest resolution pause briefly before measuring system clock precision to yield correct results. * Comment from Juergen Perlinger in ntp_calendar.c to make the code clearer. * Use predefined function types for parse driver functions used to set up function pointers. Account for changed prototype of parse_inp_fnc_t functions. Cast parse conversion results to appropriate types to avoid compiler warnings. Let ioctl() for Windows accept a (void *) to avoid compiler warnings when called with pointers to different types. --- (4.2.8p1) 2015/02/04 Released by Harlan Stenn * Update the NEWS file. * [Sec 2671] vallen in extension fields are not validated. --- (4.2.8p1-RC2) 2015/01/29 Released by Harlan Stenn * [Bug 2627] shm refclock allows only two units with owner-only access rework: reverted sense of mode bit (so default reflects previous behaviour) and updated ducumentation. * [Bug 2732] - Leap second not handled correctly on Windows 8 use 'GetTickCount()' to get the true elapsed time of slew (This should work for all versions of Windows >= W2K) * [Bug 2738] Missing buffer initialization in refclocK_parse.c::parsestate(). * [Bug 2739] Parse driver with PPS enabled occasionally evaluates PPS timestamp with wrong sign. Removed some German umlauts. * [Bug 2740] Removed some obsolete code from the parse driver. * [Bug 2741] Incorrect buffer check in refclocK_parse.c::parsestatus(). --- (4.2.8p1-RC1) 2015/01/24 Released by Harlan Stenn * Start the RC for 4.2.8p1. * [Bug 2187] Update version number generation scripts. * [Bug 2617] Fix sntp Usage documentation section. * [Sec 2672] Code cleanup: On some OSes ::1 can be spoofed... * [Bug 2736] Show error message if we cannot open the config file. * Copyright update. * Fix the package name. --- (4.2.8p1-beta5) 2015/01/07 Released by Harlan Stenn * [Bug 2695] Windows build: __func__ not supported under Windows. * [Bug 2728] Work around C99-style structure initialization code for older compilers, specifically Visual Studio prior to VS2013. --- (4.2.8p1-beta4) 2015/01/04 Released by Harlan Stenn * [Bug 1084] PPSAPI for ntpd on Windows with DLL backends * [Bug 2695] Build problem on Windows (sys/socket.h). * [Bug 2715] mdnstries option for ntp.conf from NetBSD. * Fix a regression introduced to timepps-Solaris.h as part of: [Bug 1206] Required compiler changes for Windows (4.2.5p181) 2009/06/06 --- (4.2.8p1-beta3) 2015/01/02 Released by Harlan Stenn * [Bug 2627] shm refclock allows only two units with owner-only access Use mode bit 0 to select public access for units >= 2 (units 0 & 1 are always private. * [Bug 2681] Fix display of certificate EOValidity dates on 32-bit systems. * [Bug 2695] 4.2.8 does not build on Windows. * [bug 2700] mrulist stopped working in 4.2.8. * [Bug 2706] libparse/info_trimble.c build dependencies are broken. * [Bug 2713] variable type/cast, parameter name, general cleanup from NetBSD. * [Bug 2714] libevent may need to be built independently of any build of sntp. * [Bug 2715] mdnstries option for ntp.conf from NetBSD. --- (4.2.8p1-beta2) 2014/12/27 Released by Harlan Stenn * [Bug 2674] Install sntp in sbin on NetBSD. * [Bug 2693] ntp-keygen doesn't build without OpenSSL and sntp. * [Bug 2707] Avoid a C90 extension in libjsmn/jsmn.c. * [Bug 2709] see if we have a C99 compiler (not yet required). --- (4.2.8p1-beta1) 2014/12/23 Released by Harlan Stenn * [Sec 2672] On some OSes ::1 can be spoofed, bypassing source IP ACLs. * [Bug 2693] ntp-keygen doesn't build without OpenSSL. * [Bug 2697] IN6_IS_ADDR_LOOPBACK build problems on some OSes. * [Bug 2699] HAVE_SYS_SELECT_H is misspelled in refclock_gpsdjson.c. --- @ text @a406 14 .It Ic mdnstries Ar number If we are participating in mDNS, after we have synched for the first time we attempt to register with the mDNS system. If that registration attempt fails, we try again at one minute intervals for up to .Ic mdnstries times. After all, .Ic ntpd may be starting before mDNS. The default value for .Ic mdnstries is 5. d2609 1 a2609 3 .Cm step Ar step | .Cm stepback Ar stepback | .Cm stepfwd Ar stepfwd | a2668 13 .It Cm stepback Ar stepback The argument is the step threshold for the backward direction, which by default is 0.128 s. It can be set to any positive number in seconds. If both the forward and backward step thresholds are set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if each direction of step threshold are either set to zero or greater than .5 second. .It Cm stepfwd Ar stepfwd As for stepback, but for the forward direction. @ 1.1.1.4 log @Import ntp 4.2.8p3 @ text @a2390 3 .It Ic dscp Ar value This option specifies the Differentiated Services Control Point (DSCP) value, a 6-bit code. The default value is 46, signifying Expedited Forwarding. a2489 13 .It Ic leapsmearinterval Ar seconds This EXPERIMENTAL option is only available if .Xr ntpd 1ntpdmdoc was built with the .Cm --enable-leap-smear option to the .Cm configure script. It specifies the interval over which a leap second correction will be applied. Recommended values for this option are between 7200 (2 hours) and 86400 (24 hours). .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS! See http://bugs.ntp.org/2855 for more information. d2722 2 a2726 2 .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.5 log @Import ntp 4.2.8p4 @ text @d1908 1 a1908 1 .Xr sntp 1sntpmdoc d2000 1 a2000 1 The clustering algorithm repeatedly casts out outlier d2730 2 a2731 3 Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful d2735 1 a2735 3 The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". @ 1.1.1.6 log @--- (4.2.8p7) 2016/04/26 Released by Harlan Stenn * [Sec 2901] KoD packets must have non-zero transmit timestamps. HStenn. * [Sec 2936] Skeleton Key: Any system knowing the trusted key can serve time. Include passive servers in this check. HStenn. * [Sec 2945] Additional KoD packet checks. HStenn. * [Sec 2978] Interleave can be partially triggered. HStenn. * [Sec 3007] Validate crypto-NAKs. Danny Mayer. * [Sec 3008] Always check the return value of ctl_getitem(). - initial work by HStenn - Additional cleanup of ctl_getitem by perlinger@@ntp.org * [Sec 3009] Crafted addpeer with hmode > 7 causes OOB error. perlinger@@ntp.org - added more stringent checks on packet content * [Sec 3010] remote configuration trustedkey/requestkey values are not properly validated. perlinger@@ntp.org - sidekick: Ignore keys that have an unsupported MAC algorithm but are otherwise well-formed * [Sec 3011] Duplicate IPs on unconfig directives will cause an assertion botch - graciously accept the same IP multiple times. perlinger@@ntp.org * [Sec 3020] Refclock impersonation. HStenn. * [Bug 2831] Segmentation Fault in DNS lookup during startup. perlinger@@ntp.org - fixed yet another race condition in the threaded resolver code. * [Bug 2858] bool support. Use stdbool.h when available. HStenn. * [Bug 2879] Improve NTP security against timing attacks. perlinger@@ntp.org - integrated patches by Loganaden Velvidron with some modifications & unit tests * [Bug 2952] Symmetric active/passive mode is broken. HStenn. * [Bug 2960] async name resolution fixes for chroot() environments. Reinhard Max. * [Bug 2994] Systems with HAVE_SIGNALED_IO fail to compile. perlinger@@ntp.org * [Bug 2995] Fixes to compile on Windows * [Bug 2999] out-of-bounds access in 'is_safe_filename()'. perlinger@@ntp.org * [Bug 3013] Fix for ssl_init.c SHA1 test. perlinger@@ntp.org - Patch provided by Ch. Weisgerber * [Bug 3015] ntpq: config-from-file: "request contains an unprintable character" - A change related to [Bug 2853] forbids trailing white space in remote config commands. perlinger@@ntp.org * [Bug 3019] NTPD stops processing packets after ERROR_HOST_UNREACHABLE - report and patch from Aleksandr Kostikov. - Overhaul of Windows IO completion port handling. perlinger@@ntp.org * [Bug 3022] authkeys.c should be refactored. perlinger@@ntp.org - fixed memory leak in access list (auth[read]keys.c) - refactored handling of key access lists (auth[read]keys.c) - reduced number of error branches (authreadkeys.c) * [Bug 3023] ntpdate cannot correct dates in the future. perlinger@@ntp.org * [Bug 3030] ntpq needs a general way to specify refid output format. HStenn. * [Bug 3031] ntp broadcastclient unable to synchronize to an server when the time of server changed. perlinger@@ntp.org - Check the initial delay calculation and reject/unpeer the broadcast server if the delay exceeds 50ms. Retry again after the next broadcast packet. * [Bug 3036] autokey trips an INSIST in authistrustedip(). Harlan Stenn. * Document ntp.key's optional IP list in authenetic.html. Harlan Stenn. * Update html/xleave.html documentation. Harlan Stenn. * Update ntp.conf documentation. Harlan Stenn. * Fix some Credit: attributions in the NEWS file. Harlan Stenn. * Fix typo in html/monopt.html. Harlan Stenn. * Add README.pullrequests. Harlan Stenn. * Cleanup to include/ntp.h. Harlan Stenn. --- (4.2.8p6) 2016/01/20 Released by Harlan Stenn * [Sec 2935] Deja Vu: Replay attack on authenticated broadcast mode. HStenn. * [Sec 2936] Skeleton Key: Any trusted key system can serve time. HStenn. * [Sec 2937] ntpq: nextvar() missing length check. perlinger@@ntp.org * [Sec 2938] ntpq saveconfig command allows dangerous characters in filenames. perlinger@@ntp.org * [Sec 2939] reslist NULL pointer dereference. perlinger@@ntp.org * [Sec 2940] Stack exhaustion in recursive traversal of restriction list. perlinger@@ntp.org * [Sec 2942]: Off-path DoS attack on auth broadcast mode. HStenn. * [Sec 2945] Zero Origin Timestamp Bypass. perlinger@@ntp.org * [Sec 2948] Potential Infinite Loop in ntpq ( and ntpdc) perlinger@@ntp.org * [Bug 2772] adj_systime overflows tv_usec. perlinger@@ntp.org * [Bug 2814] msyslog deadlock when signaled. perlinger@@ntp.org - applied patch by shenpeng11@@huawei.com with minor adjustments * [Bug 2882] Look at ntp_request.c:list_peers_sum(). perlinger@@ntp.org * [Bug 2891] Deadlock in deferred DNS lookup framework. perlinger@@ntp.org * [Bug 2892] Several test cases assume IPv6 capabilities even when IPv6 is disabled in the build. perlinger@@ntp.org - Found this already fixed, but validation led to cleanup actions. * [Bug 2905] DNS lookups broken. perlinger@@ntp.org - added limits to stack consumption, fixed some return code handling * [Bug 2971] ntpq bails on ^C: select fails: Interrupted system call - changed stacked/nested handling of CTRL-C. perlinger@@ntp.org - make CTRL-C work for retrieval and printing od MRU list. perlinger@@ntp.org * [Bug 2980] reduce number of warnings. perlinger@@ntp.org - integrated several patches from Havard Eidnes (he@@uninett.no) * [Bug 2985] bogus calculation in authkeys.c perlinger@@ntp.org - implement 'auth_log2()' using integer bithack instead of float calculation * Make leapsec_query debug messages less verbose. Harlan Stenn. * Disable incomplete t-ntp_signd.c test. Harlan Stenn. --- @ text @d116 2 a117 8 In a few cases, including the .Cm reslist billboard generated by .Xr ntpq 1ntpqmdoc or .Xr ntpdc 1ntpdcmdoc , IPv6 addresses are automatically generated. a151 1 .Op Cm true a158 2 .Op Cm true .Op Cm xleave a165 1 .Op Cm xleave d291 1 a291 3 can be changed with the .Ic calldelay command to allow d302 1 a302 3 changed with the .Ic calldelay command to allow a334 5 .It Cm preempt Says the association can be preempted. .It Cm true Marks the server as a truechimer. Use this option only for testing. a346 5 .It Cm true Forces the association to always survive the selection and clustering algorithms. This option should almost certainly .Em only be used while testing an association. a364 6 .It Cm xleave Valid in .Cm peer and .Cm broadcast modes only, this flag enables interleave mode. d510 1 a510 1 program running on d700 1 a700 1 includes the source and destination IP addresses in message digest d898 2 a899 2 Specifies the location of the optional IFF parameters file. This overrides the link d909 2 a910 1 This overrides the link d1051 1 a1051 1 directory of the source code distribution. d1385 1 a1385 3 and the pid of the .Xr ntpd 1ntpdmdoc server process. d1428 1 a1428 3 included in the restrict list created by the .Ic restrict command d1438 1 a1438 1 an indefinite period. d1440 1 a1440 1 for an indefinite period, the only way at present to remove d1498 1 a1498 3 The .Ic monitor subcommand specifies the probability of discard d1557 1 a1557 3 in the .Ic discard command. d1617 1 a1617 3 The trap service is a subsystem of the .Xr ntpq 1ntpqmdoc control message d1684 2 a1685 5 using the .Ic manycastclient command, which is similar to the .Ic server command but with a multicast (IPv4 class d1755 1 a1755 3 set at the minimum hops specified by the .Ic ttl command. d2393 1 a2393 2 a 6-bit code. The default value is 46, signifying Expedited Forwarding. d2398 2 a2399 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early d2406 2 a2407 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early a2480 61 .It Cm unpeer_crypto_early By default, if .Xr ntpd 1ntpdmdoc receives an autokey packet that fails TEST9, a crypto failure, the association is immediately cleared. This is almost certainly a feature, but if, in spite of the current recommendation of not using autokey, you are .B still using autokey .B and you are seeing this sort of DoS attack disabling this flag will delay tearing down the association until the reachability counter becomes zero. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_crypto_nak_early By default, if .Xr ntpd 1ntpdmdoc receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the association is immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_digest_early By default, if .Xr ntpd 1ntpdmdoc receives what should be an authenticated packet that passes other packet sanity checks but contains an invalid digest the association is immediately cleared. While this is generally a feature as it allows for quick recovery, if this type of packet is carefully forged and sent during an appropriate window it can be used for a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . d2569 1 a2569 2 messages of the respective message class. Thus, a minimal log configuration d2593 1 a2593 3 This is the same operation as the .Fl l command line option. d2745 1 a2745 2 Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.7 log @Import ntp 4.2.8p8 @ text @a2444 1 .Cm peer_clear_digest_early | a2453 1 .Cm peer_clear_digest_early | a2520 20 .It Cm peer_clear_digest_early By default, if .Xr ntpd 1ntpdmdoc is using autokey and it receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the peer variables are immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . @ 1.1.1.7.2.1 log @Sync with HEAD. (Note that most of these changes are simply $NetBSD$ tag issues.) @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. @ 1.1.1.8 log @(4.2.8p9) 2016/11/21 Released by Harlan Stenn * [Sec 3119] Trap crash * [Sec 3118] Mode 6 information disclosure and DDoS vector - TRAP config via mode 6 packet requires AUTH now. * [Sec 3114] Broadcast Mode Replay Prevention DoS - applied patches by Matthew Van Gundy. - with bcpollbstep, tweaks and cleanup by stenn@@ntp.org * [Sec 3113] Broadcast Mode Poll Interval Enforcement DoS - applied fix as suggested by Matthew Van Gundy * [Sec 3110] Windows: ntpd DoS by oversized UDP packet - fixed error handling for truncated UDP packets. * [Sec 3102] Zero origin issues. HStenn. * [Sec 3082] null pointer dereference in _IO_str_init_static_internal() - more hardening to read_mru_list(). perlinger@@ntp.org * [Sec 3072] Attack on interface selection - implemented Miroslav Lichvars suggestion to skip interface updates based on incoming packets * [Bug 3142] bug in netmask prefix length detection * [Bug 3138] gpsdjson refclock should honor fudgetime1. stenn@@ntp.org * [Bug 3129] Unknown hosts can put resolver thread into a hard loop - moved retry decision where it belongs. * [Bug 3125] NTPD doesn't fully start when ntp.conf entries are out of order using the loopback-ppsapi-provider.dll * [Bug 3116] unit tests for NTP time stamp expansion. * [Bug 3100] ntpq can't retrieve daemon_version - fixed extended sysvar lookup (bug introduced with bug 3008 fix) * [Bug 3095] Compatibility with openssl 1.1 - applied patches by Kurt Roeckx to source - added shim layer for SSL API calls with issues (both directions) * [Bug 3089] Serial Parser does not work anymore for hopfser like device - simplified / refactored hex-decoding in driver. * [Bug 3084] update-leap mis-parses the leapfile name. HStenn. * [Bug 3068] Linker warnings when building on Solaris. perlinger@@ntp.org - applied patch thanks to Andrew Stormont * [Bug 3067] Root distance calculation needs improvement. HStenn. * [Bug 3066] NMEA clock ignores pps. perlinger@@ntp.org - PPS-HACK works again. * [Bug 3059] Potential buffer overrun from oversized hash - applied patch by Brian Utterback * [Bug 3053] ntp_loopfilter.c frequency calc precedence error. Sarah White. * [Bug 3050] Fix for bug #2960 causes [...] spurious error message. - patches by Reinhard Max and Havard Eidnes * [Bug 3047] Fix refclock_jjy C-DEX JST2000. abe@@ntp.org - Patch provided by Kuramatsu. * [Bug 3021] unity_fixture.c needs pragma weak - removed unnecessary & harmful decls of 'setUp()' & 'tearDown()' * [Bug 3019] Windows: ERROR_HOST_UNREACHABLE block packet processing. DMayer and JPerlinger. * [Bug 2998] sntp/tests/packetProcessing.c broken without openssl. JPerlinger * [Bug 2961] sntp/tests/packetProcessing.c assumes AUTOKEY. HStenn. * [Bug 2959] refclock_jupiter: gps week correction - fixed GPS week expansion to work based on build date. Special thanks to Craig Leres for initial patch and testing. * [Bug 2951] ntpd tests fail: multiple definition of `send_via_ntp_signd' - fixed Makefile.am * [Bug 2689] ATOM driver processes last PPS pulse at startup, even if it is very old - make sure PPS source is alive before processing samples - improve stability close to the 500ms phase jump (phase gate) * Fix typos in include/ntp.h. * Shim X509_get_signature_nid() if needed. * git author attribution cleanup * bk ignore file cleanup * remove locks in Windows IO, use rpc-like thread synchronisation instead @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. @ 1.1.1.8.6.1 log @Pull up following revision(s) (requested by snj in ticket #729): doc/3RDPARTY: 1.1512 external/bsd/ntp/bin/ntpd/Makefile: up to 1.22 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.13 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.9 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/NEWS: up to 1.1.1.13 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.11 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/configure: up to 1.1.1.13 external/bsd/ntp/dist/configure.ac: up to 1.1.1.11 external/bsd/ntp/dist/html/access.html: up to 1.1.1.3 external/bsd/ntp/dist/html/accopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/authentic.html: up to 1.1.1.4 external/bsd/ntp/dist/html/drivers/driver18.html: up to 1.1.1.4 external/bsd/ntp/dist/html/drivers/driver40-ja.html: up to 1.1.1.3 external/bsd/ntp/dist/html/drivers/driver40.html: up to 1.1.1.6 external/bsd/ntp/dist/html/keygen.html: up to 1.1.1.5 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.11 external/bsd/ntp/dist/html/monopt.html: up to 1.1.1.5 external/bsd/ntp/dist/html/ntpq.html: up to 1.1.1.5 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.12 external/bsd/ntp/dist/include/isc/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/include/ntp.h: up to 1.9 external/bsd/ntp/dist/include/ntp_calendar.h: up to 1.7 external/bsd/ntp/dist/include/ntp_config.h: up to 1.11 external/bsd/ntp/dist/include/ntp_fp.h: up to 1.10 external/bsd/ntp/dist/include/ntp_keyacc.h: up to 1.2 external/bsd/ntp/dist/include/ntp_request.h: up to 1.8 external/bsd/ntp/dist/include/ntp_stdlib.h: up to 1.15 external/bsd/ntp/dist/include/ntpd.h: up to 1.11 external/bsd/ntp/dist/include/recvbuff.h: up to 1.6 external/bsd/ntp/dist/include/ssl_applink.c: up to 1.6 external/bsd/ntp/dist/kernel/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/kernel/sys/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/libntp/Makefile.in: up to 1.1.1.12 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to 1.9 external/bsd/ntp/dist/libntp/adjtime.c: up to 1.5 external/bsd/ntp/dist/libntp/authkeys.c: up to 1.12 external/bsd/ntp/dist/libntp/authreadkeys.c: up to 1.10 external/bsd/ntp/dist/libntp/libssl_compat.c: up to 1.2 external/bsd/ntp/dist/libntp/ntp_calendar.c: up to 1.10 external/bsd/ntp/dist/libntp/ssl_init.c: up to 1.11 external/bsd/ntp/dist/libntp/statestr.c: up to 1.7 external/bsd/ntp/dist/libntp/systime.c: up to 1.6 external/bsd/ntp/dist/libntp/work_thread.c: up to 1.6 external/bsd/ntp/dist/libparse/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.6 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to 1.12 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to 1.1.1.9 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.keys.def: up to 1.1.1.4 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntp_config.c: up to 1.18 external/bsd/ntp/dist/ntpd/ntp_control.c: up to 1.20 external/bsd/ntp/dist/ntpd/ntp_crypto.c: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_io.c: up to 1.26 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to 1.13 external/bsd/ntp/dist/ntpd/ntp_leapsec.c: up to 1.6 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.17 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp_request.c: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_restrict.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_scanner.c: up to 1.13 external/bsd/ntp/dist/ntpd/ntp_util.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.14 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntpd.c: up to 1.15 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpd/ntpsim.c: up to 1.5 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.12 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to 1.13 external/bsd/ntp/dist/ntpd/refclock_oncore.c: up to 1.15 external/bsd/ntp/dist/ntpd/refclock_palisade.c: up to 1.7 external/bsd/ntp/dist/ntpd/refclock_parse.c: up to 1.21 external/bsd/ntp/dist/ntpdate/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/layout.std: up to 1.1.1.3 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c: up to 1.11 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h: up to 1.11 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/ntpdc.c: up to 1.16 external/bsd/ntp/dist/ntpdc/ntpdc.html: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/ntpdc.man.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpdc/ntpdc_ops.c: up to 1.10 external/bsd/ntp/dist/ntpq/Makefile.am: up to 1.1.1.6 external/bsd/ntp/dist/ntpq/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/ntpq-opts.c: up to 1.11 external/bsd/ntp/dist/ntpq/ntpq-opts.def: up to 1.1.1.6 external/bsd/ntp/dist/ntpq/ntpq-opts.h: up to 1.11 external/bsd/ntp/dist/ntpq/ntpq-subs.c: up to 1.16 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/ntpq.c: up to 1.19 external/bsd/ntp/dist/ntpq/ntpq.html: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/ntpq.man.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpq/ntpq.texi: up to 1.1.1.2 external/bsd/ntp/dist/ntpsnmpd/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi: up to 1.1.1.11 external/bsd/ntp/dist/ntpsnmpd/netsnmp_daemonize.c: up to 1.6 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c: up to 1.11 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h: up to 1.11 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman: up to 1.1.1.11 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc: up to 1.1.1.11 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html: up to 1.1.1.11 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in: up to 1.1.1.11 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in: up to 1.1.1.11 external/bsd/ntp/dist/packageinfo.sh: up to 1.1.1.13 external/bsd/ntp/dist/parseutil/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/scripts/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/scripts/build/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/build/UpdatePoint: up to 1.1.1.3 external/bsd/ntp/dist/scripts/calc_tickadj/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman: up to 1.1.1.11 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc: up to 1.1.1.11 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external/bsd/ntp/include/config.h: up to 1.21 external/bsd/ntp/lib/libiscntp/Makefile: up to 1.15 external/bsd/ntp/lib/libntp/Makefile: up to 1.20 external/bsd/ntp/lib/libopts/Makefile: up to 1.15 external/bsd/ntp/ntp2netbsd: up to 1.6 external/bsd/ntp/scripts/mkver: up to 1.13 Update ntp to 4.2.8p11. @ text @a1536 1 .Op Cm ippeerlimit Ar int a1561 9 The .Cm ippeerlimit directive limits the number of peer requests for each IP to .Ar int , where a value of -1 means "unlimited", the current default. A value of 0 means "none". There would usually be at most 1 peering request per IP, but if the remote peering requests are behind a proxy there could well be more than 1 per IP. a1611 12 .It Cm noepeer Deny ephemeral peer requests, even if they come from an authenticated source. Note that the ability to use a symmetric key for authentication may be restricted to one or more IPs or subnets via the third field of the .Pa ntp.keys file. This restriction is not enabled by default, to maintain backward compatability. Expect .Cm noepeer to become the default in ntp-4.4. d1629 4 a1632 4 Deny unauthenticated packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. d1640 2 a1641 3 .Cm "restrict source ..." line as well that does .Em not d2016 1 a2016 1 broadcast mode, attempts to perform a replay attack are possible. a2018 1 .El d2364 1 a2364 1 .Pa /usr/share/doc/ntp ). a2641 73 .It Xo Ic interface .Oo .Cm listen | Cm ignore | Cm drop .Oc .Oo .Cm all | Cm ipv4 | Cm ipv6 | Cm wildcard .Ar name | Ar address .Oo Cm / Ar prefixlen .Oc .Oc .Xc The .Cm interface directive controls which network addresses .Xr ntpd 1ntpdmdoc opens, and whether input is dropped without processing. The first parameter determines the action for addresses which match the second parameter. The second parameter specifies a class of addresses, or a specific interface name, or an address. In the address case, .Ar prefixlen determines how many bits must match for this rule to apply. .Cm ignore prevents opening matching addresses, .Cm drop causes .Xr ntpd 1ntpdmdoc to open the address and drop all received packets without examination. Multiple .Cm interface directives can be used. The last rule which matches a particular address determines the action for it. .Cm interface directives are disabled if any .Fl I , .Fl -interface , .Fl L , or .Fl -novirtualips command-line options are specified in the configuration file, all available network addresses are opened. The .Cm nic directive is an alias for .Cm interface . .It Ic leapfile Ar leapfile This command loads the IERS leapseconds file and initializes the leapsecond values for the next leapsecond event, leapfile expiration time, and TAI offset. The file can be obtained directly from the IERS at .Li https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list or .Li ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list . The .Cm leapfile is scanned when .Xr ntpd 1ntpdmdoc processes the .Cm leapfile directive or when .Cm ntpd detects that the .Ar leapfile has changed. .Cm ntpd checks once a day to see if the .Ar leapfile has changed. The .Xr update-leap 1update_leapmdoc script can be run to see if the .Ar leapfile should be updated. a2745 175 .It Xo Ic mru .Oo .Cm maxdepth Ar count | Cm maxmem Ar kilobytes | .Cm mindepth Ar count | Cm maxage Ar seconds | .Cm initialloc Ar count | Cm initmem Ar kilobytes | .Cm incalloc Ar count | Cm incmem Ar kilobytes .Oc .Xc Controls size limite of the monitoring facility's Most Recently Used (MRU) list of client addresses, which is also used by the rate control facility. .Bl -tag -width indent .It Ic maxdepth Ar count .It Ic maxmem Ar kilobytes Equivalent upper limits on the size of the MRU list, in terms of entries or kilobytes. The acutal limit will be up to .Cm incalloc entries or .Cm incmem kilobytes larger. As with all of the .Cm mru options offered in units of entries or kilobytes, if both .Cm maxdepth and .Cm maxmem are used, the last one used controls. The default is 1024 kilobytes. .It Cm mindepth Ar count Lower limit on the MRU list size. When the MRU list has fewer than .Cm mindepth entries, existing entries are never removed to make room for newer ones, regardless of their age. The default is 600 entries. .It Cm maxage Ar seconds Once the MRU list has .Cm mindepth entries and an additional client is to ba added to the list, if the oldest entry was updated more than .Cm maxage seconds ago, that entry is removed and its storage is reused. If the oldest entry was updated more recently the MRU list is grown, subject to .Cm maxdepth / moxmem . The default is 64 seconds. .It Cm initalloc Ar count .It Cm initmem Ar kilobytes Initial memory allocation at the time the monitoringfacility is first enabled, in terms of the number of entries or kilobytes. The default is 4 kilobytes. .It Cm incalloc Ar count .It Cm incmem Ar kilobytes Size of additional memory allocations when growing the MRU list, in entries or kilobytes. The default is 4 kilobytes. .El .It Ic nonvolatile Ar threshold Specify the .Ar threshold delta in seconds before an hourly change to the .Cm driftfile (frequency file) will be written, with a default value of 1e-7 (0.1 PPM). The frequency file is inspected each hour. If the difference between the current frequency and the last value written exceeds the threshold, the file is written and the .Cm threshold becomes the new threshold value. If the threshold is not exceeeded, it is reduced by half. This is intended to reduce the number of file writes for embedded systems with nonvolatile memory. .It Ic phone Ar dial ... This command is used in conjunction with the ACTS modem driver (type 18) or the JJY driver (type 40, mode 100 - 180). For the ACTS modem driver (type 18), the arguments consist of a maximum of 10 telephone numbers used to dial USNO, NIST, or European time service. For the JJY driver (type 40 mode 100 - 180), the argument is one telephone number used to dial the telephone JJY service. The Hayes command ATDT is normally prepended to the number. The number can contain other modem control codes as well. .It Xo Ic reset .Oo .Ic allpeers .Oc .Oo .Ic auth .Oc .Oo .Ic ctl .Oc .Oo .Ic io .Oc .Oo .Ic mem .Oc .Oo .Ic sys .Oc .Oo .Ic timer .Oc .Xc Reset one or more groups of counters maintained by .Cm ntpd and exposed by .Cm ntpq and .Cm ntpdc . .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful when dropping root (the .Fl i option). The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .El .It Ic saveconfigdir Ar directory_path Specify the directory in which to write configuration snapshots requested with .Cm ntpq 's .Cm saveconfig command. If .Cm saveconfigdir does not appear in the configuration file, .Cm saveconfig requests are rejected by .Cm ntpd . .It Ic saveconfig Ar filename Write the current configuration, including any runtime modifications given with .Cm :config or .Cm config-from-file to the .Cm ntpd host's .Ar filename in the .Cm saveconfigdir . This command will be rejected unless the .Cm saveconfigdir directive appears in .Cm ntpd 's configuration file. .Ar filename can use .Xr strftime 3 format directives to substitute the current date and time, for example, .Cm saveconfig\ ntp-%Y%m%d-%H%M%S.conf . The filename used is stored in the system variable .Cm savedconfig . Authentication is required. a2783 4 .It Cm sysinfo Display operational summary. .It Cm sysstats Show statistics counters maintained in the protocol module. d2873 27 a2899 12 .It Cm writevar Ar assocID\ name = value [,...] Write (create or update) the specified variables. If the .Cm assocID is zero, the variablea re from the system variables name space, otherwise they are from the peer variables name space. The .Cm assocID is required, as the same name can occur in both name spaces. a2913 7 .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order. Up to 8 values can be specified. In .Cm manycast mode these values are used in-turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. @ 1.1.1.8.12.1 log @Sync with HEAD. 77 conflicts resolved - all of them $NetBSD$ @ text @a1536 1 .Op Cm ippeerlimit Ar int a1561 9 The .Cm ippeerlimit directive limits the number of peer requests for each IP to .Ar int , where a value of -1 means "unlimited", the current default. A value of 0 means "none". There would usually be at most 1 peering request per IP, but if the remote peering requests are behind a proxy there could well be more than 1 per IP. a1611 12 .It Cm noepeer Deny ephemeral peer requests, even if they come from an authenticated source. Note that the ability to use a symmetric key for authentication may be restricted to one or more IPs or subnets via the third field of the .Pa ntp.keys file. This restriction is not enabled by default, to maintain backward compatability. Expect .Cm noepeer to become the default in ntp-4.4. d1629 4 a1632 4 Deny unauthenticated packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. d1640 2 a1641 3 .Cm "restrict source ..." line as well that does .Em not d2016 1 a2016 1 broadcast mode, attempts to perform a replay attack are possible. a2018 1 .El d2364 1 a2364 1 .Pa /usr/share/doc/ntp ). a2641 73 .It Xo Ic interface .Oo .Cm listen | Cm ignore | Cm drop .Oc .Oo .Cm all | Cm ipv4 | Cm ipv6 | Cm wildcard .Ar name | Ar address .Oo Cm / Ar prefixlen .Oc .Oc .Xc The .Cm interface directive controls which network addresses .Xr ntpd 1ntpdmdoc opens, and whether input is dropped without processing. The first parameter determines the action for addresses which match the second parameter. The second parameter specifies a class of addresses, or a specific interface name, or an address. In the address case, .Ar prefixlen determines how many bits must match for this rule to apply. .Cm ignore prevents opening matching addresses, .Cm drop causes .Xr ntpd 1ntpdmdoc to open the address and drop all received packets without examination. Multiple .Cm interface directives can be used. The last rule which matches a particular address determines the action for it. .Cm interface directives are disabled if any .Fl I , .Fl -interface , .Fl L , or .Fl -novirtualips command-line options are specified in the configuration file, all available network addresses are opened. The .Cm nic directive is an alias for .Cm interface . .It Ic leapfile Ar leapfile This command loads the IERS leapseconds file and initializes the leapsecond values for the next leapsecond event, leapfile expiration time, and TAI offset. The file can be obtained directly from the IERS at .Li https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list or .Li ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list . The .Cm leapfile is scanned when .Xr ntpd 1ntpdmdoc processes the .Cm leapfile directive or when .Cm ntpd detects that the .Ar leapfile has changed. .Cm ntpd checks once a day to see if the .Ar leapfile has changed. The .Xr update-leap 1update_leapmdoc script can be run to see if the .Ar leapfile should be updated. a2745 175 .It Xo Ic mru .Oo .Cm maxdepth Ar count | Cm maxmem Ar kilobytes | .Cm mindepth Ar count | Cm maxage Ar seconds | .Cm initialloc Ar count | Cm initmem Ar kilobytes | .Cm incalloc Ar count | Cm incmem Ar kilobytes .Oc .Xc Controls size limite of the monitoring facility's Most Recently Used (MRU) list of client addresses, which is also used by the rate control facility. .Bl -tag -width indent .It Ic maxdepth Ar count .It Ic maxmem Ar kilobytes Equivalent upper limits on the size of the MRU list, in terms of entries or kilobytes. The acutal limit will be up to .Cm incalloc entries or .Cm incmem kilobytes larger. As with all of the .Cm mru options offered in units of entries or kilobytes, if both .Cm maxdepth and .Cm maxmem are used, the last one used controls. The default is 1024 kilobytes. .It Cm mindepth Ar count Lower limit on the MRU list size. When the MRU list has fewer than .Cm mindepth entries, existing entries are never removed to make room for newer ones, regardless of their age. The default is 600 entries. .It Cm maxage Ar seconds Once the MRU list has .Cm mindepth entries and an additional client is to ba added to the list, if the oldest entry was updated more than .Cm maxage seconds ago, that entry is removed and its storage is reused. If the oldest entry was updated more recently the MRU list is grown, subject to .Cm maxdepth / moxmem . The default is 64 seconds. .It Cm initalloc Ar count .It Cm initmem Ar kilobytes Initial memory allocation at the time the monitoringfacility is first enabled, in terms of the number of entries or kilobytes. The default is 4 kilobytes. .It Cm incalloc Ar count .It Cm incmem Ar kilobytes Size of additional memory allocations when growing the MRU list, in entries or kilobytes. The default is 4 kilobytes. .El .It Ic nonvolatile Ar threshold Specify the .Ar threshold delta in seconds before an hourly change to the .Cm driftfile (frequency file) will be written, with a default value of 1e-7 (0.1 PPM). The frequency file is inspected each hour. If the difference between the current frequency and the last value written exceeds the threshold, the file is written and the .Cm threshold becomes the new threshold value. If the threshold is not exceeeded, it is reduced by half. This is intended to reduce the number of file writes for embedded systems with nonvolatile memory. .It Ic phone Ar dial ... This command is used in conjunction with the ACTS modem driver (type 18) or the JJY driver (type 40, mode 100 - 180). For the ACTS modem driver (type 18), the arguments consist of a maximum of 10 telephone numbers used to dial USNO, NIST, or European time service. For the JJY driver (type 40 mode 100 - 180), the argument is one telephone number used to dial the telephone JJY service. The Hayes command ATDT is normally prepended to the number. The number can contain other modem control codes as well. .It Xo Ic reset .Oo .Ic allpeers .Oc .Oo .Ic auth .Oc .Oo .Ic ctl .Oc .Oo .Ic io .Oc .Oo .Ic mem .Oc .Oo .Ic sys .Oc .Oo .Ic timer .Oc .Xc Reset one or more groups of counters maintained by .Cm ntpd and exposed by .Cm ntpq and .Cm ntpdc . .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful when dropping root (the .Fl i option). The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .El .It Ic saveconfigdir Ar directory_path Specify the directory in which to write configuration snapshots requested with .Cm ntpq 's .Cm saveconfig command. If .Cm saveconfigdir does not appear in the configuration file, .Cm saveconfig requests are rejected by .Cm ntpd . .It Ic saveconfig Ar filename Write the current configuration, including any runtime modifications given with .Cm :config or .Cm config-from-file to the .Cm ntpd host's .Ar filename in the .Cm saveconfigdir . This command will be rejected unless the .Cm saveconfigdir directive appears in .Cm ntpd 's configuration file. .Ar filename can use .Xr strftime 3 format directives to substitute the current date and time, for example, .Cm saveconfig\ ntp-%Y%m%d-%H%M%S.conf . The filename used is stored in the system variable .Cm savedconfig . Authentication is required. a2783 4 .It Cm sysinfo Display operational summary. .It Cm sysstats Show statistics counters maintained in the protocol module. d2873 27 a2899 12 .It Cm writevar Ar assocID\ name = value [,...] Write (create or update) the specified variables. If the .Cm assocID is zero, the variablea re from the system variables name space, otherwise they are from the peer variables name space. The .Cm assocID is required, as the same name can occur in both name spaces. a2913 7 .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order. Up to 8 values can be specified. In .Cm manycast mode these values are used in-turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. @ 1.1.1.8.12.2 log @Ssync with HEAD @ text @d330 1 a330 1 identifier with values from 1 to 65535, inclusive. d588 1 a588 1 65,535 keys, each distinguished by a 32-bit key identifier, to d882 1 a882 1 range 1 to 65,535, inclusive. d986 1 a986 1 65,535, inclusive. d1013 1 a1013 1 integers with values from 1 to 65,535. @ 1.1.1.9 log @--- * [Sec 3454] Unauthenticated packet can reset authenticated interleave associations. HStenn. * [Sec 3453] Interleaved symmetric mode cannot recover from bad state. HStenn. * [Sec 3415] Permit blocking authenticated symmetric/passive associations. Implement ippeerlimit. HStenn, JPerlinger. * [Sec 3414] ntpq: decodearr() can write beyond its 'buf' limits - initial patch by , extended by * [Sec 3412] ctl_getitem(): Don't compare names past NUL. * [Sec 3012] Sybil vulnerability: noepeer support. HStenn, JPerlinger. * [Bug 3457] OpenSSL FIPS mode regression * [Bug 3455] ntpd doesn't use scope id when binding multicast - applied patch by Sean Haugh * [Bug 3452] PARSE driver prints uninitialized memory. * [Bug 3450] Dubious error messages from plausibility checks in get_systime() - removed error log caused by rounding/slew, ensured postcondition * [Bug 3447] AES-128-CMAC (fixes) - refactoring the MAC code, too * [Bug 3441] Validate the assumption that AF_UNSPEC is 0. stenn@@ntp.org * [Bug 3439] When running multiple commands / hosts in ntpq... - applied patch by ggarvey * [Bug 3438] Negative values and values > 999 days in... - applied patch by ggarvey (with minor mods) * [Bug 3437] ntpd tries to open socket with AF_UNSPEC domain - applied patch (with mods) by Miroslav Lichvar * [Bug 3435] anchor NTP era alignment * [Bug 3433] sntp crashes when run with -a. * [Bug 3430] ntpq dumps core (SIGSEGV) for "keytype md2" - fixed several issues with hash algos in ntpd, sntp, ntpq, ntpdc and the test suites * [Bug 3424] Trimble Thunderbolt 1024 week millenium bug - initial patch by Daniel Pouzzner * [Bug 3423] QNX adjtime() implementation error checking is wrong * [Bug 3417] ntpq ifstats packet counters can be negative made IFSTATS counter quantities unsigned * [Bug 3411] problem about SIGN(6) packet handling for ntp-4.2.8p10 - raised receive buffer size to 1200 * [Bug 3408] refclock_jjy.c: Avoid a wrong report of the coverity static analysis tool. * [Bug 3405] update-leap.in: general cleanup, HTTPS support. Paul McMath. * [Bug 3404] Fix openSSL DLL usage under Windows - fix/drop assumptions on OpenSSL libs directory layout * [Bug 3399] NTP: linker error in 4.2.8p10 during Linux cross-compilation - initial patch by timeflies@@mail2tor.com * [Bug 3398] tests fail with core dump - patch contributed by Alexander Bluhm * [Bug 3397] ctl_putstr() asserts that data fits in its buffer rework of formatting & data transfer stuff in 'ntp_control.c' avoids unecessary buffers and size limitations. * [Bug 3394] Leap second deletion does not work on ntpd clients - fixed handling of dynamic deletion w/o leap file * [Bug 3391] ntpd segfaults on startup due to small warmup thread stack size - increased mimimum stack size to 32kB * [Bug 3367] Faulty LinuxPPS NMEA clock support in 4.2.8 - reverted handling of PPS kernel consumer to 4.2.6 behavior * [Bug 3365] Updates driver40(-ja).html and miscopt.html * [Bug 3358] Spurious KoD log messages in .INIT. phase. HStenn. * [Bug 3016] wrong error position reported for bad ":config pool" - fixed location counter & ntpq output * [Bug 2900] libntp build order problem. HStenn. * [Bug 2878] Tests are cluttering up syslog * [Bug 2737] Wrong phone number listed for USNO. ntp-bugs@@bodosom.net, perlinger@@ntp.org * [Bug 2557] Fix Thunderbolt init. ntp-bugs@@bodosom.net, perlinger@@ntp. * [Bug 948] Trustedkey config directive leaks memory. * Use strlcpy() to copy strings, not memcpy(). HStenn. * Typos. HStenn. * test_ntp_scanner_LDADD needs ntpd/ntp_io.o. HStenn. * refclock_jjy.c: Add missing "%s" to an msyslog() call. HStenn. * Build ntpq and libntpq.a with NTP_HARD_*FLAGS. perlinger@@ntp.org * Fix trivial warnings from 'make check'. perlinger@@ntp.org * Fix bug in the override portion of the compiler hardening macro. HStenn. * record_raw_stats(): Log entire packet. Log writes. HStenn. * AES-128-CMAC support. BInglis, HStenn, JPerlinger. * sntp: tweak key file logging. HStenn. * sntp: pkt_output(): Improve debug output. HStenn. * update-leap: updates from Paul McMath. * When using pkg-config, report --modversion. HStenn. * Clean up libevent configure checks. HStenn. * sntp: show the IP of who sent us a crypto-NAK. HStenn. * Allow .../N to specify subnet bits for IPs in ntp.keys. HStenn, JPerlinger. * authistrustedip() - use it in more places. HStenn, JPerlinger. * New sysstats: sys_lamport, sys_tsrounding. HStenn. * Update ntp.keys .../N documentation. HStenn. * Distribute testconf.yml. HStenn. * Add DPRINTF(2,...) lines to receive() for packet drops. HStenn. * Rename the configuration flag fifo variables. HStenn. * Improve saveconfig output. HStenn. * Decode restrict flags on receive() debug output. HStenn. * Decode interface flags on receive() debug output. HStenn. * Warn the user if deprecated "driftfile name WanderThreshold" is used. HStenn. * Update the documentation in ntp.conf.def . HStenn. * restrictions() must return restrict flags and ippeerlimit. HStenn. * Update ntpq peer documentation to describe the 'p' type. HStenn. * Rename restrict 'flags' to 'rflags. Use an enum for the values. HStenn. * Provide dump_restricts() for debugging. HStenn. * Use consistent 4th arg type for [gs]etsockopt. JPerlinger. * Some tests might need LIBM. HStenn. * update-leap: Allow -h/--help early. HStenn. @ text @a1536 1 .Op Cm ippeerlimit Ar int a1561 9 The .Cm ippeerlimit directive limits the number of peer requests for each IP to .Ar int , where a value of -1 means "unlimited", the current default. A value of 0 means "none". There would usually be at most 1 peering request per IP, but if the remote peering requests are behind a proxy there could well be more than 1 per IP. a1611 12 .It Cm noepeer Deny ephemeral peer requests, even if they come from an authenticated source. Note that the ability to use a symmetric key for authentication may be restricted to one or more IPs or subnets via the third field of the .Pa ntp.keys file. This restriction is not enabled by default, to maintain backward compatability. Expect .Cm noepeer to become the default in ntp-4.4. d1629 4 a1632 4 Deny unauthenticated packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. d1640 2 a1641 3 .Cm "restrict source ..." line as well that does .Em not d2016 1 a2016 1 broadcast mode, attempts to perform a replay attack are possible. a2018 1 .El d2364 1 a2364 1 .Pa /usr/share/doc/ntp ). a2641 73 .It Xo Ic interface .Oo .Cm listen | Cm ignore | Cm drop .Oc .Oo .Cm all | Cm ipv4 | Cm ipv6 | Cm wildcard .Ar name | Ar address .Oo Cm / Ar prefixlen .Oc .Oc .Xc The .Cm interface directive controls which network addresses .Xr ntpd 1ntpdmdoc opens, and whether input is dropped without processing. The first parameter determines the action for addresses which match the second parameter. The second parameter specifies a class of addresses, or a specific interface name, or an address. In the address case, .Ar prefixlen determines how many bits must match for this rule to apply. .Cm ignore prevents opening matching addresses, .Cm drop causes .Xr ntpd 1ntpdmdoc to open the address and drop all received packets without examination. Multiple .Cm interface directives can be used. The last rule which matches a particular address determines the action for it. .Cm interface directives are disabled if any .Fl I , .Fl -interface , .Fl L , or .Fl -novirtualips command-line options are specified in the configuration file, all available network addresses are opened. The .Cm nic directive is an alias for .Cm interface . .It Ic leapfile Ar leapfile This command loads the IERS leapseconds file and initializes the leapsecond values for the next leapsecond event, leapfile expiration time, and TAI offset. The file can be obtained directly from the IERS at .Li https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list or .Li ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list . The .Cm leapfile is scanned when .Xr ntpd 1ntpdmdoc processes the .Cm leapfile directive or when .Cm ntpd detects that the .Ar leapfile has changed. .Cm ntpd checks once a day to see if the .Ar leapfile has changed. The .Xr update-leap 1update_leapmdoc script can be run to see if the .Ar leapfile should be updated. a2745 175 .It Xo Ic mru .Oo .Cm maxdepth Ar count | Cm maxmem Ar kilobytes | .Cm mindepth Ar count | Cm maxage Ar seconds | .Cm initialloc Ar count | Cm initmem Ar kilobytes | .Cm incalloc Ar count | Cm incmem Ar kilobytes .Oc .Xc Controls size limite of the monitoring facility's Most Recently Used (MRU) list of client addresses, which is also used by the rate control facility. .Bl -tag -width indent .It Ic maxdepth Ar count .It Ic maxmem Ar kilobytes Equivalent upper limits on the size of the MRU list, in terms of entries or kilobytes. The acutal limit will be up to .Cm incalloc entries or .Cm incmem kilobytes larger. As with all of the .Cm mru options offered in units of entries or kilobytes, if both .Cm maxdepth and .Cm maxmem are used, the last one used controls. The default is 1024 kilobytes. .It Cm mindepth Ar count Lower limit on the MRU list size. When the MRU list has fewer than .Cm mindepth entries, existing entries are never removed to make room for newer ones, regardless of their age. The default is 600 entries. .It Cm maxage Ar seconds Once the MRU list has .Cm mindepth entries and an additional client is to ba added to the list, if the oldest entry was updated more than .Cm maxage seconds ago, that entry is removed and its storage is reused. If the oldest entry was updated more recently the MRU list is grown, subject to .Cm maxdepth / moxmem . The default is 64 seconds. .It Cm initalloc Ar count .It Cm initmem Ar kilobytes Initial memory allocation at the time the monitoringfacility is first enabled, in terms of the number of entries or kilobytes. The default is 4 kilobytes. .It Cm incalloc Ar count .It Cm incmem Ar kilobytes Size of additional memory allocations when growing the MRU list, in entries or kilobytes. The default is 4 kilobytes. .El .It Ic nonvolatile Ar threshold Specify the .Ar threshold delta in seconds before an hourly change to the .Cm driftfile (frequency file) will be written, with a default value of 1e-7 (0.1 PPM). The frequency file is inspected each hour. If the difference between the current frequency and the last value written exceeds the threshold, the file is written and the .Cm threshold becomes the new threshold value. If the threshold is not exceeeded, it is reduced by half. This is intended to reduce the number of file writes for embedded systems with nonvolatile memory. .It Ic phone Ar dial ... This command is used in conjunction with the ACTS modem driver (type 18) or the JJY driver (type 40, mode 100 - 180). For the ACTS modem driver (type 18), the arguments consist of a maximum of 10 telephone numbers used to dial USNO, NIST, or European time service. For the JJY driver (type 40 mode 100 - 180), the argument is one telephone number used to dial the telephone JJY service. The Hayes command ATDT is normally prepended to the number. The number can contain other modem control codes as well. .It Xo Ic reset .Oo .Ic allpeers .Oc .Oo .Ic auth .Oc .Oo .Ic ctl .Oc .Oo .Ic io .Oc .Oo .Ic mem .Oc .Oo .Ic sys .Oc .Oo .Ic timer .Oc .Xc Reset one or more groups of counters maintained by .Cm ntpd and exposed by .Cm ntpq and .Cm ntpdc . .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful when dropping root (the .Fl i option). The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .El .It Ic saveconfigdir Ar directory_path Specify the directory in which to write configuration snapshots requested with .Cm ntpq 's .Cm saveconfig command. If .Cm saveconfigdir does not appear in the configuration file, .Cm saveconfig requests are rejected by .Cm ntpd . .It Ic saveconfig Ar filename Write the current configuration, including any runtime modifications given with .Cm :config or .Cm config-from-file to the .Cm ntpd host's .Ar filename in the .Cm saveconfigdir . This command will be rejected unless the .Cm saveconfigdir directive appears in .Cm ntpd 's configuration file. .Ar filename can use .Xr strftime 3 format directives to substitute the current date and time, for example, .Cm saveconfig\ ntp-%Y%m%d-%H%M%S.conf . The filename used is stored in the system variable .Cm savedconfig . Authentication is required. a2783 4 .It Cm sysinfo Display operational summary. .It Cm sysstats Show statistics counters maintained in the protocol module. d2873 27 a2899 12 .It Cm writevar Ar assocID\ name = value [,...] Write (create or update) the specified variables. If the .Cm assocID is zero, the variablea re from the system variables name space, otherwise they are from the peer variables name space. The .Cm assocID is required, as the same name can occur in both name spaces. a2913 7 .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order. Up to 8 values can be specified. In .Cm manycast mode these values are used in-turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. @ 1.1.1.9.2.1 log @Sync with HEAD @ text @d330 1 a330 1 identifier with values from 1 to 65535, inclusive. d588 1 a588 1 65,535 keys, each distinguished by a 32-bit key identifier, to d882 1 a882 1 range 1 to 65,535, inclusive. d986 1 a986 1 65,535, inclusive. d1013 1 a1013 1 integers with values from 1 to 65,535. @ 1.1.1.10 log @--- (4.2.8p12) 2018/08/14 Released by Harlan Stenn * [Sec 3505] CVE-2018-12327 - Arbitrary Code Execution Vulnerability - fixed stack buffer overflow in the openhost() command-line call of NTPQ/NTPDC * [Sec 3012] noepeer tweaks. * [Bug 3521] Fix a logic bug in the INVALIDNAK checks. * [Bug 3509] Add support for running as non-root on FreeBSD, Darwin, other TrustedBSD platforms - applied patch by Ian Lepore * [Bug 3506] Service Control Manager interacts poorly with NTPD - changed interaction with SCM to signal pending startup * [Bug 3486] Buffer overflow in ntpq/ntpq.c:tstflags() - applied patch by Gerry Garvey * [Bug 3485] Undefined sockaddr used in error messages in ntp_config.c - applied patch by Gerry Garvey * [Bug 3484] ntpq response from ntpd is incorrect when REFID is null - rework of ntpq 'nextvar()' key/value parsing * [Bug 3482] Fixes for compilation warnings (ntp_io.c & ntpq-subs.c) - applied patch by Gerry Garvey (with mods) * [Bug 3480] Refclock sample filter not cleared on clock STEP - applied patch by Gerry Garvey * [Bug 3479] ctl_putrefid() allows unsafe characters through to ntpq - applied patch by Gerry Garvey (with mods) * [Bug 3476]ctl_putstr() sends empty unquoted string [...] - applied patch by Gerry Garvey (with mods); not sure if that's bug or feature, though * [Bug 3475] modify prettydate() to suppress output of zero time - applied patch by Gerry Garvey * [Bug 3474] Missing pmode in mode7 peer info response - applied patch by Gerry Garvey * [Bug 3471] Check for openssl/[ch]mac.h. HStenn. - add #define ENABLE_CMAC support in configure. HStenn. * [Bug 3470] ntpd4.2.8p11 fails to compile without OpenSSL * [Bug 3469] Incomplete string compare [...] in is_refclk_addr - patch by Stephen Friedl * [Bug 3467] Potential memory fault in ntpq [...] - fixed IO redirection and CTRL-C handling in ntq and ntpdc * [Bug 3465] Default TTL values cannot be used * [Bug 3461] refclock_shm.c: clear error status on clock recovery - initial patch by Hal Murray; also fixed refclock_report() trouble * [Bug 3460] Fix typo in ntpq.texi, reported by Kenyon Ralph. * [Bug 3456] Use uintptr_t rather than size_t to store an integer in a pointer - According to Brooks Davis, there was only one location * [Bug 3449] ntpq - display "loop" instead of refid [...] - applied patch by Gerry Garvey * [Bug 3445] Symmetric peer won't sync on startup - applied patch by Gerry Garvey * [Bug 3442] Fixes for ntpdate as suggested by Gerry Garvey, with modifications New macro REFID_ISTEXT() which is also used in ntpd/ntp_control.c. * [Bug 3434] ntpd clears STA_UNSYNC on start - applied patch by Miroslav Lichvar * [Bug 3426] ntpdate.html -t default is 2 seconds. Leonid Evdokimov. * [Bug 3121] Drop root privileges for the forked DNS worker - integrated patch by Reinhard Max * [Bug 2821] minor build issues - applied patches by Christos Zoulas, including real bug fixes * html/authopt.html: cleanup, from * ntpd/ntpd.c: DROPROOT cleanup. * Symmetric key range is 1-65535. Update docs. * html/authentic.html: cleanup, from @ text @d330 1 a330 1 identifier with values from 1 to 65535, inclusive. d588 1 a588 1 65,535 keys, each distinguished by a 32-bit key identifier, to d882 1 a882 1 range 1 to 65,535, inclusive. d986 1 a986 1 65,535, inclusive. d1013 1 a1013 1 integers with values from 1 to 65,535. @ 1.1.1.11 log @(4.2.8p14) 2020/03/03 Released by Harlan Stenn * [Sec 3610] process_control() should bail earlier on short packets. stenn@@ - Reported by Philippe Antoine * [Sec 3596] Highly predictable timestamp attack. - Reported by Miroslav Lichvar * [Sec 3592] DoS attack on client ntpd - Reported by Miroslav Lichvar * [Bug 3637] Emit the version of ntpd in saveconfig. stenn@@ * [Bug 3636] NMEA: combine time/date from multiple sentences * [Bug 3635] Make leapsecond file hash check optional * [Bug 3634] Typo in discipline.html, reported by Jason Harrison. stenn@@ * [Bug 3628] raw DCF decoding - improve robustness with Zeller's congruence - implement Zeller's congruence in libparse and libntp * [Bug 3627] SIGSEGV on FreeBSD-12 with stack limit and stack gap - integrated patch by Cy Schubert * [Bug 3620] memory leak in ntpq sysinfo - applied patch by Gerry Garvey * [Bug 3619] Honour drefid setting in cooked mode and sysinfo - applied patch by Gerry Garvey * [Bug 3617] Add support for ACE III and Copernicus II receivers - integrated patch by Richard Steedman * [Bug 3615] accelerate refclock startup * [Bug 3613] Propagate noselect to mobilized pool servers - Reported by Martin Burnicki * [Bug 3612] Use-of-uninitialized-value in receive function - Reported by Philippe Antoine * [Bug 3611] NMEA time interpreted incorrectly - officially document new "trust date" mode bit for NMEA driver - restore the (previously undocumented) "trust date" feature lost with [bug 3577] * [Bug 3609] Fixing wrong falseticker in case of non-statistic jitter - mostly based on a patch by Michael Haardt, implementing 'fudge minjitter' * [Bug 3608] libparse fails to compile on S11.4SRU13 and later - removed ffs() and fls() prototypes as per Brian Utterback * [Bug 3604] Wrong param byte order passing into record_raw_stats() in ntp_io.c - fixed byte and paramter order as suggested by wei6410@@sina.com * [Bug 3601] Tests fail to link on platforms with ntp_cv_gc_sections_runs=no * [Bug 3599] Build fails on linux-m68k due to alignment issues - added padding as suggested by John Paul Adrian Glaubitz * [Bug 3594] ntpd discards messages coming through nmead * [Bug 3593] ntpd discards silently nmea messages after the 5th string * [Bug 3590] Update refclock_oncore.c to the new GPS date API * [Bug 3585] Unity tests mix buffered and unbuffered output - stdout+stderr are set to line buffered during test setup now * [Bug 3583] synchronization error - set clock to base date if system time is before that limit * [Bug 3582] gpsdjson refclock fudgetime1 adjustment is doubled * [Bug 3580] Possible bug ntpq-subs (NULL dereference in dogetassoc) - Reported by Paulo Neves * [Bug 3577] Update refclock_zyfer.c to the new GPS date API - also updates for refclock_nmea.c and refclock_jupiter.c * [Bug 3576] New GPS date function API * [Bug 3573] nptdate: missleading error message * [Bug 3570] NMEA driver docs: talker ID not mentioned, typo * [Bug 3569] cleanup MOD_NANO/STA_NANO handling for 'ntpadjtimex()' - sidekick: service port resolution in 'ntpdate' * [Bug 3550] Reproducible build: Respect SOURCE_DATE_EPOCH - applied patch by Douglas Royds * [Bug 3542] ntpdc monlist parameters cannot be set * [Bug 3533] ntpdc peer_info ipv6 issues - applied patch by Gerry Garvey * [Bug 3531] make check: test-decodenetnum fails - try to harden 'decodenetnum()' against 'getaddrinfo()' errors - fix wrong cond-compile tests in unit tests * [Bug 3517] Reducing build noise * [Bug 3516] Require tooling from this decade - patch by Philipp Prindeville * [Bug 3515] Refactor ntpdmain() dispatcher loop and group common code - patch by Philipp Prindeville * [Bug 3511] Get rid of AC_LANG_SOURCE() warnings - patch by Philipp Prindeville * [Bug 3510] Flatten out the #ifdef nesting in ntpdmain() - partial application of patch by Philipp Prindeville * [Bug 3491] Signed values of LFP datatypes should always display a sign - applied patch by Gerry Garvey & fixed unit tests * [Bug 3490] Patch to support Trimble Resolution Receivers - applied (modified) patch by Richard Steedman * [Bug 3473] RefID of refclocks should always be text format - applied patch by Gerry Garvey (with minor formatting changes) * [Bug 3132] Building 4.2.8p8 with disabled local libopts fails - applied patch by Miroslav Lichvar * [Bug 3094] ntpd trying to listen for broadcasts on a completely ipv6 network * [Bug 2420] ntpd doesn't run and exits with retval 0 when invalid user is specified with -u - monitor daemon child startup & propagate exit codes * [Bug 1433] runtime check whether the kernel really supports capabilities - (modified) patch by Kurt Roeckx * Clean up sntp/networking.c:sendpkt() error message. * Provide more detail on unrecognized config file parser tokens. * Startup log improvements. * Update the copyright year. * html/confopt.html: cleanup. --- (4.2.8p13) 2019/03/07 Released by Harlan Stenn * [Sec 3565] Crafted null dereference attack in authenticated mode 6 packet - reported by Magnus Stubman * [Bug 3560] Fix build when HAVE_DROPROOT is not defined - applied patch by Ian Lepore * [Bug 3558] Crash and integer size bug - isolate and fix linux/windows specific code issue * [Bug 3556] ntp_loopfilter.c snprintf compilation warnings - provide better function for incremental string formatting * [Bug 3555] Tidy up print alignment of debug output from ntpdate - applied patch by Gerry Garvey * [Bug 3554] config revoke stores incorrect value - original finding by Gerry Garvey, additional cleanup needed * [Bug 3549] Spurious initgroups() error message - patch by Christous Zoulas * [Bug 3548] Signature not verified on windows system - finding by Chen Jiabin, plus another one by me * [Bug 3541] patch to fix STA_NANO struct timex units - applied patch by Maciej Szmigiero * [Bug 3540] Cannot set minsane to 0 anymore - applied patch by Andre Charbonneau * [Bug 3539] work_fork build fails when droproot is not supported - applied patch by Baruch Siach * [Bug 3538] Build fails for no-MMU targets - applied patch by Baruch Siach * [Bug 3535] libparse won't handle GPS week rollover - refactored handling of GPS era based on 'tos basedate' for parse (TSIP) and JUPITER clocks * [Bug 3529] Build failures on Mac OS X 10.13 (High Sierra) - patch by Daniel J. Luke; this does not fix a potential linker regression issue on MacOS. * [Bug 3527 - Backward Incompatible] mode7 clockinfo fudgeval2 packet anomaly , reported by GGarvey. - --enable-bug3527-fix support by HStenn * [Bug 3526] Incorrect poll interval in packet - applied patch by Gerry Garvey * [Bug 3471] Check for openssl/[ch]mac.h. - added missing check, reported by Reinhard Max * [Bug 1674] runtime crashes and sync problems affecting both x86 and x86_64 - this is a variant of [bug 3558] and should be fixed with it * Implement --disable-signalled-io @ text @a148 1 .Op Cm xmtnonce a158 1 .Op Cm xmtnonce d351 3 d367 1 a367 2 Marks the server as a truechimer, forcing the association to always survive the selection and clustering algorithms. a394 7 .It Cm xmtnonce Valid only for .Cm server and .Cm pool modes, this flag puts a random number in the packet's transmit timestamp. a1698 4 .It Ic "serverresponse fuzz" When reponding to server requests, fuzz the low order bits of the .Cm reftime . a2923 25 .It Xo Cm pollskewlist .Oo .Ar poll .Ar value | value .Oc .Ar ... .Oo .Cm default .Ar value | value .Oc .Xc Enable skewing of our poll requests to our servers. .Ar poll is a number between 3 and 17 inclusive, identifying a specific poll interval. A poll interval is 2^n seconds in duration, so a poll value of 3 corresponds to 8 seconds and a poll interval of 17 corresponds to 131,072 seconds, or about a day and a half. The next two numbers must be between 0 and one-half of the poll interval, inclusive. The first number specifies how early the poll may start, while the second number specifies how late the poll may be delayed. With no arguments, internally specified default values are chosen. @ 1.1.1.2.12.1 log @file ntp.conf.def was added on branch netbsd-5-1 on 2015-01-07 12:13:25 +0000 @ text @d1 2795 @ 1.1.1.2.12.2 log @Pullup the following revision (requested by he in ticket #1938): dist/ntp/COPYRIGHT delete dist/ntp/ChangeLog delete dist/ntp/CommitLog delete dist/ntp/CommitLog-4.1.0 delete dist/ntp/INSTALL delete dist/ntp/Makefile.am delete dist/ntp/Makefile.in delete dist/ntp/NEWS delete dist/ntp/NOTES.y2kfixes delete dist/ntp/README delete dist/ntp/README.bk delete dist/ntp/README.hackers delete dist/ntp/README.patches delete dist/ntp/README.refclocks delete dist/ntp/README.versions delete dist/ntp/TODO delete dist/ntp/WHERE-TO-START delete dist/ntp/aclocal.m4 delete dist/ntp/bincheck.mf delete dist/ntp/bootstrap delete dist/ntp/build delete dist/ntp/compile delete dist/ntp/config.guess delete dist/ntp/config.h.in delete dist/ntp/config.sub delete dist/ntp/configure delete dist/ntp/configure.ac 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external/bsd/ntp/include/config.h new external/bsd/ntp/lib/Makefile new external/bsd/ntp/lib/Makefile.inc new external/bsd/ntp/lib/libiscntp/Makefile new external/bsd/ntp/lib/libntp/Makefile new external/bsd/ntp/lib/libopts/Makefile new external/bsd/ntp/lib/libparse/Makefile new external/bsd/ntp/scripts/mkver new usr.sbin/Makefile patch usr.sbin/ntp/Makefile delete usr.sbin/ntp/Makefile.inc delete usr.sbin/ntp/importdate delete usr.sbin/ntp/html/Makefile delete usr.sbin/ntp/include/config.h delete usr.sbin/ntp/libisc/Makefile delete usr.sbin/ntp/libntp/Makefile delete usr.sbin/ntp/libopts/Makefile delete usr.sbin/ntp/libparse/Makefile delete usr.sbin/ntp/ntp-keygen/Makefile delete usr.sbin/ntp/ntp-keygen/ntp-keygen.8 delete usr.sbin/ntp/ntpd/Makefile delete usr.sbin/ntp/ntpd/ntpd.8 delete usr.sbin/ntp/ntpdate/Makefile delete usr.sbin/ntp/ntpdate/ntpdate.8 delete usr.sbin/ntp/ntpdc/Makefile delete usr.sbin/ntp/ntpdc/ntpdc.8 delete usr.sbin/ntp/ntpq/Makefile delete usr.sbin/ntp/ntpq/ntpq.8 delete usr.sbin/ntp/ntptime/Makefile delete usr.sbin/ntp/ntptime/ntptime.8 delete usr.sbin/ntp/ntptrace/Makefile delete usr.sbin/ntp/ntptrace/ntptrace.8 delete usr.sbin/ntp/ntptrace/ntptrace.awk delete usr.sbin/ntp/scripts/mkver delete usr.sbin/sntp/Makefile delete usr.sbin/sntp/sntp.1 delete Update ntp to 4.2.8. This pullup syncs with -current as of 2014/01/06. CVE-2014-9293, CVE-2014-9294, CVE-2014-9295 and CVE-2014-9296. @ text @a0 2795 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, eight kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.2.10.1 log @file ntp.conf.def was added on branch netbsd-5-2 on 2015-01-07 10:10:14 +0000 @ text @d1 2795 @ 1.1.1.2.10.2 log @Pullup the following revision (requested by he in ticket #1938): dist/ntp/COPYRIGHT delete dist/ntp/ChangeLog delete dist/ntp/CommitLog delete dist/ntp/CommitLog-4.1.0 delete dist/ntp/INSTALL delete dist/ntp/Makefile.am delete dist/ntp/Makefile.in delete dist/ntp/NEWS delete dist/ntp/NOTES.y2kfixes delete dist/ntp/README delete dist/ntp/README.bk delete dist/ntp/README.hackers delete dist/ntp/README.patches delete dist/ntp/README.refclocks delete dist/ntp/README.versions delete dist/ntp/TODO delete dist/ntp/WHERE-TO-START delete dist/ntp/aclocal.m4 delete dist/ntp/bincheck.mf delete 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external/bsd/ntp/dist/lib/isc/mutexblock.c new external/bsd/ntp/dist/lib/isc/netaddr.c new external/bsd/ntp/dist/lib/isc/netscope.c new external/bsd/ntp/dist/lib/isc/ondestroy.c new external/bsd/ntp/dist/lib/isc/parseint.c new external/bsd/ntp/dist/lib/isc/portset.c new external/bsd/ntp/dist/lib/isc/print.c new external/bsd/ntp/dist/lib/isc/quota.c new external/bsd/ntp/dist/lib/isc/radix.c new external/bsd/ntp/dist/lib/isc/random.c new external/bsd/ntp/dist/lib/isc/ratelimiter.c new external/bsd/ntp/dist/lib/isc/refcount.c new external/bsd/ntp/dist/lib/isc/region.c new external/bsd/ntp/dist/lib/isc/result.c new external/bsd/ntp/dist/lib/isc/rwlock.c new external/bsd/ntp/dist/lib/isc/serial.c new external/bsd/ntp/dist/lib/isc/sha1.c new external/bsd/ntp/dist/lib/isc/sha2.c new external/bsd/ntp/dist/lib/isc/sockaddr.c new external/bsd/ntp/dist/lib/isc/socket_api.c new external/bsd/ntp/dist/lib/isc/stats.c new external/bsd/ntp/dist/lib/isc/string.c new 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new external/bsd/ntp/dist/lib/isc/include/isc/buffer.h new external/bsd/ntp/dist/lib/isc/include/isc/bufferlist.h new external/bsd/ntp/dist/lib/isc/include/isc/commandline.h new external/bsd/ntp/dist/lib/isc/include/isc/entropy.h new external/bsd/ntp/dist/lib/isc/include/isc/error.h new external/bsd/ntp/dist/lib/isc/include/isc/event.h new external/bsd/ntp/dist/lib/isc/include/isc/eventclass.h new external/bsd/ntp/dist/lib/isc/include/isc/file.h new external/bsd/ntp/dist/lib/isc/include/isc/formatcheck.h new external/bsd/ntp/dist/lib/isc/include/isc/fsaccess.h new external/bsd/ntp/dist/lib/isc/include/isc/hash.h new external/bsd/ntp/dist/lib/isc/include/isc/heap.h new external/bsd/ntp/dist/lib/isc/include/isc/hex.h new external/bsd/ntp/dist/lib/isc/include/isc/hmacmd5.h new external/bsd/ntp/dist/lib/isc/include/isc/hmacsha.h new external/bsd/ntp/dist/lib/isc/include/isc/httpd.h new external/bsd/ntp/dist/lib/isc/include/isc/interfaceiter.h new external/bsd/ntp/dist/lib/isc/include/isc/ipv6.h new external/bsd/ntp/dist/lib/isc/include/isc/iterated_hash.h new external/bsd/ntp/dist/lib/isc/include/isc/lang.h new external/bsd/ntp/dist/lib/isc/include/isc/lex.h new external/bsd/ntp/dist/lib/isc/include/isc/lfsr.h new external/bsd/ntp/dist/lib/isc/include/isc/lib.h new external/bsd/ntp/dist/lib/isc/include/isc/list.h new external/bsd/ntp/dist/lib/isc/include/isc/log.h new external/bsd/ntp/dist/lib/isc/include/isc/magic.h new external/bsd/ntp/dist/lib/isc/include/isc/md5.h new external/bsd/ntp/dist/lib/isc/include/isc/mem.h new external/bsd/ntp/dist/lib/isc/include/isc/msgcat.h new external/bsd/ntp/dist/lib/isc/include/isc/msgs.h new external/bsd/ntp/dist/lib/isc/include/isc/mutexblock.h new external/bsd/ntp/dist/lib/isc/include/isc/namespace.h new external/bsd/ntp/dist/lib/isc/include/isc/netaddr.h new external/bsd/ntp/dist/lib/isc/include/isc/netscope.h new external/bsd/ntp/dist/lib/isc/include/isc/ondestroy.h new external/bsd/ntp/dist/lib/isc/include/isc/os.h new external/bsd/ntp/dist/lib/isc/include/isc/parseint.h new external/bsd/ntp/dist/lib/isc/include/isc/platform.h new external/bsd/ntp/dist/lib/isc/include/isc/platform.h.in new external/bsd/ntp/dist/lib/isc/include/isc/portset.h new external/bsd/ntp/dist/lib/isc/include/isc/print.h new external/bsd/ntp/dist/lib/isc/include/isc/queue.h new external/bsd/ntp/dist/lib/isc/include/isc/quota.h new external/bsd/ntp/dist/lib/isc/include/isc/radix.h new external/bsd/ntp/dist/lib/isc/include/isc/random.h new external/bsd/ntp/dist/lib/isc/include/isc/ratelimiter.h new external/bsd/ntp/dist/lib/isc/include/isc/refcount.h new external/bsd/ntp/dist/lib/isc/include/isc/region.h new external/bsd/ntp/dist/lib/isc/include/isc/resource.h new external/bsd/ntp/dist/lib/isc/include/isc/result.h new external/bsd/ntp/dist/lib/isc/include/isc/resultclass.h new external/bsd/ntp/dist/lib/isc/include/isc/rwlock.h new external/bsd/ntp/dist/lib/isc/include/isc/serial.h new external/bsd/ntp/dist/lib/isc/include/isc/sha1.h new external/bsd/ntp/dist/lib/isc/include/isc/sha2.h new external/bsd/ntp/dist/lib/isc/include/isc/sockaddr.h new external/bsd/ntp/dist/lib/isc/include/isc/socket.h new external/bsd/ntp/dist/lib/isc/include/isc/stats.h new external/bsd/ntp/dist/lib/isc/include/isc/stdio.h new external/bsd/ntp/dist/lib/isc/include/isc/stdlib.h new external/bsd/ntp/dist/lib/isc/include/isc/string.h new external/bsd/ntp/dist/lib/isc/include/isc/symtab.h new external/bsd/ntp/dist/lib/isc/include/isc/task.h new external/bsd/ntp/dist/lib/isc/include/isc/taskpool.h new external/bsd/ntp/dist/lib/isc/include/isc/timer.h new external/bsd/ntp/dist/lib/isc/include/isc/types.h new external/bsd/ntp/dist/lib/isc/include/isc/util.h new external/bsd/ntp/dist/lib/isc/include/isc/version.h new external/bsd/ntp/dist/lib/isc/include/isc/xml.h new external/bsd/ntp/dist/lib/isc/mips/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/nls/msgcat.c new external/bsd/ntp/dist/lib/isc/noatomic/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/nothreads/condition.c new external/bsd/ntp/dist/lib/isc/nothreads/mutex.c new external/bsd/ntp/dist/lib/isc/nothreads/thread.c new external/bsd/ntp/dist/lib/isc/nothreads/include/isc/condition.h new external/bsd/ntp/dist/lib/isc/nothreads/include/isc/mutex.h new external/bsd/ntp/dist/lib/isc/nothreads/include/isc/once.h new external/bsd/ntp/dist/lib/isc/nothreads/include/isc/thread.h new external/bsd/ntp/dist/lib/isc/powerpc/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/pthreads/condition.c new external/bsd/ntp/dist/lib/isc/pthreads/mutex.c new external/bsd/ntp/dist/lib/isc/pthreads/thread.c new external/bsd/ntp/dist/lib/isc/pthreads/include/isc/condition.h new external/bsd/ntp/dist/lib/isc/pthreads/include/isc/mutex.h new external/bsd/ntp/dist/lib/isc/pthreads/include/isc/once.h new 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external/bsd/ntp/dist/lib/isc/unix/ifiter_ioctl.c new external/bsd/ntp/dist/lib/isc/unix/ifiter_sysctl.c new external/bsd/ntp/dist/lib/isc/unix/interfaceiter.c new external/bsd/ntp/dist/lib/isc/unix/ipv6.c new external/bsd/ntp/dist/lib/isc/unix/keyboard.c new external/bsd/ntp/dist/lib/isc/unix/net.c new external/bsd/ntp/dist/lib/isc/unix/os.c new external/bsd/ntp/dist/lib/isc/unix/resource.c new external/bsd/ntp/dist/lib/isc/unix/socket.c new external/bsd/ntp/dist/lib/isc/unix/socket_p.h new external/bsd/ntp/dist/lib/isc/unix/stdio.c new external/bsd/ntp/dist/lib/isc/unix/stdtime.c new external/bsd/ntp/dist/lib/isc/unix/strerror.c new external/bsd/ntp/dist/lib/isc/unix/syslog.c new external/bsd/ntp/dist/lib/isc/unix/time.c new external/bsd/ntp/dist/lib/isc/unix/include/isc/dir.h new external/bsd/ntp/dist/lib/isc/unix/include/isc/int.h new external/bsd/ntp/dist/lib/isc/unix/include/isc/keyboard.h new external/bsd/ntp/dist/lib/isc/unix/include/isc/net.h new 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external/bsd/ntp/dist/lib/isc/win32/time.c new external/bsd/ntp/dist/lib/isc/win32/unistd.h new external/bsd/ntp/dist/lib/isc/win32/version.c new external/bsd/ntp/dist/lib/isc/win32/win32os.c new external/bsd/ntp/dist/lib/isc/win32/include/isc/bind_registry.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/bindevt.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/condition.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/dir.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/int.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/ipv6.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/keyboard.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/mutex.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/net.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/netdb.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/ntgroups.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/ntpaths.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/offset.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/once.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/platform.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/stat.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/stdtime.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/strerror.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/syslog.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/thread.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/time.h new external/bsd/ntp/dist/lib/isc/win32/include/isc/win32os.h new external/bsd/ntp/dist/lib/isc/x86_32/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/x86_64/include/isc/atomic.h new external/bsd/ntp/dist/libjsmn/LICENSE new external/bsd/ntp/dist/libjsmn/Makefile new external/bsd/ntp/dist/libjsmn/README.md new external/bsd/ntp/dist/libjsmn/jsmn.c new external/bsd/ntp/dist/libjsmn/jsmn.h new external/bsd/ntp/dist/libjsmn/jsmn_test.c new external/bsd/ntp/dist/libntp/Makefile.am new 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external/bsd/ntp/dist/util/testrs6000.c new external/bsd/ntp/dist/util/tg.c new external/bsd/ntp/dist/util/tg2.c new external/bsd/ntp/dist/util/tickadj.c new external/bsd/ntp/dist/util/timetrim.c new external/bsd/ntp/html/Makefile new external/bsd/ntp/include/config.h new external/bsd/ntp/lib/Makefile new external/bsd/ntp/lib/Makefile.inc new external/bsd/ntp/lib/libiscntp/Makefile new external/bsd/ntp/lib/libntp/Makefile new external/bsd/ntp/lib/libopts/Makefile new external/bsd/ntp/lib/libparse/Makefile new external/bsd/ntp/scripts/mkver new usr.sbin/Makefile patch usr.sbin/ntp/Makefile delete usr.sbin/ntp/Makefile.inc delete usr.sbin/ntp/importdate delete usr.sbin/ntp/html/Makefile delete usr.sbin/ntp/include/config.h delete usr.sbin/ntp/libisc/Makefile delete usr.sbin/ntp/libntp/Makefile delete usr.sbin/ntp/libopts/Makefile delete usr.sbin/ntp/libparse/Makefile delete usr.sbin/ntp/ntp-keygen/Makefile delete usr.sbin/ntp/ntp-keygen/ntp-keygen.8 delete usr.sbin/ntp/ntpd/Makefile delete usr.sbin/ntp/ntpd/ntpd.8 delete usr.sbin/ntp/ntpdate/Makefile delete usr.sbin/ntp/ntpdate/ntpdate.8 delete usr.sbin/ntp/ntpdc/Makefile delete usr.sbin/ntp/ntpdc/ntpdc.8 delete usr.sbin/ntp/ntpq/Makefile delete usr.sbin/ntp/ntpq/ntpq.8 delete usr.sbin/ntp/ntptime/Makefile delete usr.sbin/ntp/ntptime/ntptime.8 delete usr.sbin/ntp/ntptrace/Makefile delete usr.sbin/ntp/ntptrace/ntptrace.8 delete usr.sbin/ntp/ntptrace/ntptrace.awk delete usr.sbin/ntp/scripts/mkver delete usr.sbin/sntp/Makefile delete usr.sbin/sntp/sntp.1 delete Update ntp to 4.2.8. CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, and CVE-2014-9296. [he, ticket #1938] @ text @a0 2795 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, eight kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.2.8.1 log @file ntp.conf.def was added on branch netbsd-5 on 2015-01-07 04:45:30 +0000 @ text @d1 2795 @ 1.1.1.2.8.2 log @Pullup the following revision (requested by he in ticket #1938): distrib/sets/lists/man/mi patch distrib/sets/lists/misc/mi patch external/bsd/Makefile patch external/bsd/ntp/Makefile new external/bsd/ntp/Makefile.inc new external/bsd/ntp/importdate new external/bsd/ntp/ntp2netbsd new external/bsd/ntp/bin/Makefile new external/bsd/ntp/bin/Makefile.inc new external/bsd/ntp/bin/ntp-keygen/Makefile new external/bsd/ntp/bin/ntp-keygen/ntp-keygen.8 new external/bsd/ntp/bin/ntpd/Makefile new external/bsd/ntp/bin/ntpd/ntp.conf.5 new external/bsd/ntp/bin/ntpd/ntp.keys.5 new external/bsd/ntp/bin/ntpd/ntpd.8 new 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external/bsd/ntp/lib/libopts/Makefile new external/bsd/ntp/lib/libparse/Makefile new external/bsd/ntp/scripts/mkver new usr.sbin/Makefile patch usr.sbin/ntp/Makefile delete usr.sbin/ntp/Makefile.inc delete usr.sbin/ntp/importdate delete usr.sbin/ntp/html/Makefile delete usr.sbin/ntp/include/config.h delete usr.sbin/ntp/libisc/Makefile delete usr.sbin/ntp/libntp/Makefile delete usr.sbin/ntp/libopts/Makefile delete usr.sbin/ntp/libparse/Makefile delete usr.sbin/ntp/ntp-keygen/Makefile delete usr.sbin/ntp/ntp-keygen/ntp-keygen.8 delete usr.sbin/ntp/ntpd/Makefile delete usr.sbin/ntp/ntpd/ntpd.8 delete usr.sbin/ntp/ntpdate/Makefile delete usr.sbin/ntp/ntpdate/ntpdate.8 delete usr.sbin/ntp/ntpdc/Makefile delete usr.sbin/ntp/ntpdc/ntpdc.8 delete usr.sbin/ntp/ntpq/Makefile delete usr.sbin/ntp/ntpq/ntpq.8 delete usr.sbin/ntp/ntptime/Makefile delete usr.sbin/ntp/ntptime/ntptime.8 delete usr.sbin/ntp/ntptrace/Makefile delete usr.sbin/ntp/ntptrace/ntptrace.8 delete usr.sbin/ntp/ntptrace/ntptrace.awk delete usr.sbin/ntp/scripts/mkver delete usr.sbin/sntp/Makefile delete usr.sbin/sntp/sntp.1 delete Update ntp to 4.2.8. This pullup syncs with -current as of 2014/01/06. CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, and CVE-2014-9296. @ text @a0 2795 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, eight kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.2.6.1 log @file ntp.conf.def was added on branch netbsd-6 on 2014-12-25 02:34:37 +0000 @ text @d1 2795 @ 1.1.1.2.6.2 log @Apply patch (requested by christos in ticket #1221): Update ntp to 4.2.8. @ text @a0 2795 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, eight kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.2.6.3 log @Pull up following revision(s) (requested by christos in ticket #1342): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.15 external/bsd/ntp/bin/ntpd/Makefile: up to 1.19 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch external/bsd/ntp/bin/sntp/Makefile: up to 1.6 external/bsd/ntp/bin/sntp/event2/event-config.h: delete external/bsd/ntp/bin/sntp/evlog.c: delete external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.5 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.7 external/bsd/ntp/dist/CommitLog: up to 1.1.1.7 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/NEWS: up to 1.1.1.7 external/bsd/ntp/dist/README.leapsmear: up to 1.1.1.1 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.7 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/adjtimed/adjtimed.c: up to 1.4 external/bsd/ntp/dist/bootstrap: up to 1.1.1.5 external/bsd/ntp/dist/build: up to 1.1.1.5 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/clockstuff/chutest.c: up to 1.4 external/bsd/ntp/dist/clockstuff/propdelay.c: up to 1.4 external/bsd/ntp/dist/config.h.in: up to 1.1.1.6 external/bsd/ntp/dist/configure: up to 1.1.1.7 external/bsd/ntp/dist/configure.ac: up to 1.1.1.7 external/bsd/ntp/dist/html/build.html: up to 1.1.1.4 external/bsd/ntp/dist/html/confopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/copyright.html: up to 1.1.1.5 external/bsd/ntp/dist/html/decode.html: up to 1.1.1.5 external/bsd/ntp/dist/html/drivers/driver22.html: up to 1.1.1.4 external/bsd/ntp/dist/html/drivers/driver28.html: up to 1.1.1.4 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external/bsd/ntp/dist/tests/libntp/numtohost.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/numtohost.cpp: delete external/bsd/ntp/dist/tests/libntp/octtoint.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/octtoint.cpp: delete external/bsd/ntp/dist/tests/libntp/prettydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/prettydate.cpp: delete external/bsd/ntp/dist/tests/libntp/recvbuff.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/recvbuff.cpp: delete external/bsd/ntp/dist/tests/libntp/refidsmear.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/refnumtoa.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/refnumtoa.cpp: delete external/bsd/ntp/dist/tests/libntp/run-a_md5encrypt.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-atoint.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-atouint.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-authkeys.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-buftvtots.c: up to 1.1.1.3 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external/bsd/ntp/dist/tests/libntp/run-uglydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-vi64ops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-ymd2yd.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/sfptostr.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/sfptostr.cpp: delete external/bsd/ntp/dist/tests/libntp/sockaddrtest.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/libntp/sockaddrtest.h: up to 1.4 external/bsd/ntp/dist/tests/libntp/socktoa.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/socktoa.cpp: delete external/bsd/ntp/dist/tests/libntp/ssl_init.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ssl_init.cpp: delete external/bsd/ntp/dist/tests/libntp/statestr.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/statestr.cpp: delete external/bsd/ntp/dist/tests/libntp/strtolfp.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/strtolfp.cpp: delete external/bsd/ntp/dist/tests/libntp/test-libntp.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/test-libntp.h: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timespecops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timespecops.cpp: delete external/bsd/ntp/dist/tests/libntp/timestructs.cpp: delete external/bsd/ntp/dist/tests/libntp/timestructs.h: delete external/bsd/ntp/dist/tests/libntp/timevalops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timevalops.cpp: delete external/bsd/ntp/dist/tests/libntp/tstotv.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tstotv.cpp: delete external/bsd/ntp/dist/tests/libntp/tvtots.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tvtots.cpp: delete external/bsd/ntp/dist/tests/libntp/uglydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/uglydate.cpp: delete external/bsd/ntp/dist/tests/libntp/vi64ops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/vi64ops.cpp: delete external/bsd/ntp/dist/tests/libntp/ymd2yd.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ymd2yd.cpp: delete external/bsd/ntp/dist/tests/ntpd/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/tests/ntpd/leapsec.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/leapsec.cpp: delete external/bsd/ntp/dist/tests/ntpd/ntp_prio_q.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntp_restrict.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntpdtest.cpp: delete external/bsd/ntp/dist/tests/ntpd/ntpdtest.h: delete external/bsd/ntp/dist/tests/ntpd/rc_cmdlength.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-leapsec.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_prio_q.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_restrict.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-rc_cmdlength.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_scanner.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_signd.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_scanner.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_signd.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/Makefile.am: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/Makefile.in: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/run-t-ntpq.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/t-ntpq.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/sandbox/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/Makefile.in: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/bug-2803.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/modetoa.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/run-modetoa.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-uglydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-ut-2803.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/smeartest.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/uglydate.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/ut-2803.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.am: up to 1.1.1.2 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external/bsd/ntp/html/Makefile: up to 1.3 external/bsd/ntp/importdate: up to 1.7 external/bsd/ntp/include/config.h: up to 1.13 external/bsd/ntp/ntp2netbsd: up to 1.5 external/bsd/ntp/scripts/mkver: up to 1.7 Update ntp to 4.2.8p4. @ text @a406 14 .It Ic mdnstries Ar number If we are participating in mDNS, after we have synched for the first time we attempt to register with the mDNS system. If that registration attempt fails, we try again at one minute intervals for up to .Ic mdnstries times. After all, .Ic ntpd may be starting before mDNS. The default value for .Ic mdnstries is 5. d1894 1 a1894 1 .Xr sntp 1sntpmdoc d1986 1 a1986 1 The clustering algorithm repeatedly casts out outlier a2376 3 .It Ic dscp Ar value This option specifies the Differentiated Services Control Point (DSCP) value, a 6-bit code. The default value is 46, signifying Expedited Forwarding. a2475 13 .It Ic leapsmearinterval Ar seconds This EXPERIMENTAL option is only available if .Xr ntpd 1ntpdmdoc was built with the .Cm --enable-leap-smear option to the .Cm configure script. It specifies the interval over which a leap second correction will be applied. Recommended values for this option are between 7200 (2 hours) and 86400 (24 hours). .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS! See http://bugs.ntp.org/2855 for more information. d2609 1 a2609 3 .Cm step Ar step | .Cm stepback Ar stepback | .Cm stepfwd Ar stepfwd | a2668 13 .It Cm stepback Ar stepback The argument is the step threshold for the backward direction, which by default is 0.128 s. It can be set to any positive number in seconds. If both the forward and backward step thresholds are set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if each direction of step threshold are either set to zero or greater than .5 second. .It Cm stepfwd Ar stepfwd As for stepback, but for the forward direction. d2685 2 a2686 3 Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful d2690 1 a2690 3 The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". d2693 2 a2697 2 .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.2.6.4 log @Pull up following revision(s) (requested by spz in ticket #1380): external/bsd/ntp/importdate: up to revision 1.9 external/bsd/ntp/bin/ntpd/Makefile: up to revision 1.21 external/bsd/ntp/dist/ChangeLog: up to revision 1.1.1.9 external/bsd/ntp/dist/CommitLog: up to revision 1.1.1.9 external/bsd/ntp/dist/Makefile.am: up to revision 1.1.1.8 external/bsd/ntp/dist/Makefile.in: up to revision 1.1.1.9 external/bsd/ntp/dist/NEWS: up to revision 1.1.1.9 external/bsd/ntp/dist/README.pullrequests: up to revision 1.1.1.1 external/bsd/ntp/dist/config.h.in: up to revision 1.1.1.8 external/bsd/ntp/dist/configure: up to revision 1.1.1.9 external/bsd/ntp/dist/configure.ac: up to revision 1.1.1.8 external/bsd/ntp/dist/packageinfo.sh: up to revision 1.1.1.9 external/bsd/ntp/dist/html/authentic.html: up to revision 1.1.1.3 external/bsd/ntp/dist/html/miscopt.html: up to revision 1.1.1.8 external/bsd/ntp/dist/html/monopt.html: up to revision 1.1.1.4 external/bsd/ntp/dist/html/xleave.html: up to revision 1.1.1.4 external/bsd/ntp/dist/include/Makefile.am: up to revision 1.1.1.8 external/bsd/ntp/dist/include/Makefile.in: up to revision 1.1.1.9 external/bsd/ntp/dist/include/ntp.h: up to revision 1.6 external/bsd/ntp/dist/include/ntp_io.h: up to revision 1.5 external/bsd/ntp/dist/include/ntp_keyacc.h: up to revision 1.1.1.1 external/bsd/ntp/dist/include/ntp_refclock.h: up to revision 1.5 external/bsd/ntp/dist/include/ntp_stdlib.h: up to revision 1.13 external/bsd/ntp/dist/include/ntp_types.h: up to revision 1.6 external/bsd/ntp/dist/include/ntp_worker.h: up to revision 1.5 external/bsd/ntp/dist/include/ntpd.h: up to revision 1.8 external/bsd/ntp/dist/include/parse.h: up to revision 1.6 external/bsd/ntp/dist/include/recvbuff.h: up to revision 1.5 external/bsd/ntp/dist/include/safecast.h: up to revision 1.1.1.2 external/bsd/ntp/dist/lib/isc/backtrace.c: up to revision 1.6 external/bsd/ntp/dist/lib/isc/buffer.c: up to revision 1.4 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external/bsd/ntp/lib/libiscntp/Makefile: up to revision 1.14 external/bsd/ntp/lib/libntp/Makefile: up to revision 1.18 external/bsd/ntp/scripts/mkver: up to revision 1.10 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch Update ntp to 4.2.8p7. @ text @d116 2 a117 8 In a few cases, including the .Cm reslist billboard generated by .Xr ntpq 1ntpqmdoc or .Xr ntpdc 1ntpdcmdoc , IPv6 addresses are automatically generated. a151 1 .Op Cm true a158 2 .Op Cm true .Op Cm xleave a165 1 .Op Cm xleave d291 1 a291 3 can be changed with the .Ic calldelay command to allow d302 1 a302 3 changed with the .Ic calldelay command to allow a334 5 .It Cm preempt Says the association can be preempted. .It Cm true Marks the server as a truechimer. Use this option only for testing. a346 5 .It Cm true Forces the association to always survive the selection and clustering algorithms. This option should almost certainly .Em only be used while testing an association. a364 6 .It Cm xleave Valid in .Cm peer and .Cm broadcast modes only, this flag enables interleave mode. d510 1 a510 1 program running on d700 1 a700 1 includes the source and destination IP addresses in message digest d898 2 a899 2 Specifies the location of the optional IFF parameters file. This overrides the link d909 2 a910 1 This overrides the link d1051 1 a1051 1 directory of the source code distribution. d1385 1 a1385 3 and the pid of the .Xr ntpd 1ntpdmdoc server process. d1428 1 a1428 3 included in the restrict list created by the .Ic restrict command d1438 1 a1438 1 an indefinite period. d1440 1 a1440 1 for an indefinite period, the only way at present to remove d1498 1 a1498 3 The .Ic monitor subcommand specifies the probability of discard d1557 1 a1557 3 in the .Ic discard command. d1617 1 a1617 3 The trap service is a subsystem of the .Xr ntpq 1ntpqmdoc control message d1684 2 a1685 5 using the .Ic manycastclient command, which is similar to the .Ic server command but with a multicast (IPv4 class d1755 1 a1755 3 set at the minimum hops specified by the .Ic ttl command. d2393 1 a2393 2 a 6-bit code. The default value is 46, signifying Expedited Forwarding. d2398 2 a2399 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early d2406 2 a2407 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early a2480 61 .It Cm unpeer_crypto_early By default, if .Xr ntpd 1ntpdmdoc receives an autokey packet that fails TEST9, a crypto failure, the association is immediately cleared. This is almost certainly a feature, but if, in spite of the current recommendation of not using autokey, you are .B still using autokey .B and you are seeing this sort of DoS attack disabling this flag will delay tearing down the association until the reachability counter becomes zero. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_crypto_nak_early By default, if .Xr ntpd 1ntpdmdoc receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the association is immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_digest_early By default, if .Xr ntpd 1ntpdmdoc receives what should be an authenticated packet that passes other packet sanity checks but contains an invalid digest the association is immediately cleared. While this is generally a feature as it allows for quick recovery, if this type of packet is carefully forged and sent during an appropriate window it can be used for a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . d2569 1 a2569 2 messages of the respective message class. Thus, a minimal log configuration d2593 1 a2593 3 This is the same operation as the .Fl l command line option. d2745 1 a2745 2 Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.2.6.5 log @Pull up following revision(s) (requested by spz in ticket #1448): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/bin/Makefile: up to 1.3 external/bsd/ntp/bin/ntpd/Makefile: up to 1.21 via patch external/bsd/ntp/bin/ntpd/ntp.keys.5: up to 1.2 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch external/bsd/ntp/bin/sntp/Makefile: up to 1.6 via patch external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.8 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.12 external/bsd/ntp/dist/CommitLog: up to 1.1.1.12 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/NEWS: up to 1.1.1.12 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.10 external/bsd/ntp/dist/adjtimed/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/clockstuff/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 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1.1.1.5 external/bsd/ntp/dist/sntp/scripts/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/sntp/scripts/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/scripts/genHardFlags: up to 1.1.1.1 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.11 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.10 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.12 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/sntp/tests/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/sntp/tests/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/tests/crypto.c: up to 1.1.1.6 external/bsd/ntp/dist/sntp/tests/fileHandlingTest.c: up to 1.1.1.4 external/bsd/ntp/dist/sntp/tests/keyFile.c: up to 1.1.1.6 external/bsd/ntp/dist/sntp/tests/packetHandling.c: up to 1.1.1.6 external/bsd/ntp/dist/sntp/tests/packetProcessing.c: up 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external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/tests/ntpd/leapsec.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/t-ntp_signd.c: up to 1.1.1.4 external/bsd/ntp/dist/tests/ntpq/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpq/Makefile.in: up to 1.1.1.4 external/bsd/ntp/dist/tests/sandbox/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/tests/sec-2853/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/sec-2853/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/util/Makefile.am: up to 1.1.1.6 external/bsd/ntp/dist/util/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.15 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.10 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.12 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.10 external/bsd/ntp/importdate: up to 1.12 external/bsd/ntp/include/config.h: up to 1.19 external/bsd/ntp/lib/libntp/Makefile: up to 1.19 external/bsd/ntp/lib/libopts/Makefile: up to 1.14 external/bsd/ntp/scripts/mkver: up to 1.13 Update ntp to 4.2.8p10. @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. a2444 1 .Cm peer_clear_digest_early | a2453 1 .Cm peer_clear_digest_early | a2520 20 .It Cm peer_clear_digest_early By default, if .Xr ntpd 1ntpdmdoc is using autokey and it receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the peer variables are immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . @ 1.1.1.2.4.1 log @file ntp.conf.def was added on branch netbsd-6-0 on 2014-12-25 02:28:09 +0000 @ text @d1 2795 @ 1.1.1.2.4.2 log @Apply patch (requested by christos in ticket #1221): Update ntp to 4.2.8. @ text @a0 2795 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, eight kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.2.4.3 log @Pull up following revision(s) (requested by christos in ticket #1342): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.15 external/bsd/ntp/bin/ntpd/Makefile: up to 1.19 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch external/bsd/ntp/bin/sntp/Makefile: up to 1.6 external/bsd/ntp/bin/sntp/event2/event-config.h: delete external/bsd/ntp/bin/sntp/evlog.c: delete external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.5 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.7 external/bsd/ntp/dist/CommitLog: up to 1.1.1.7 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/NEWS: up to 1.1.1.7 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external/bsd/ntp/dist/libparse/gpstolfp.c: up to 1.4 external/bsd/ntp/dist/libparse/info_trimble.c: up to 1.6 external/bsd/ntp/dist/libparse/mkinfo_rcmd.sed: up to 1.1.1.3 external/bsd/ntp/dist/libparse/mkinfo_scmd.sed: up to 1.1.1.3 external/bsd/ntp/dist/libparse/parse.c: up to 1.4 external/bsd/ntp/dist/libparse/parse_conf.c: up to 1.4 external/bsd/ntp/dist/libparse/parsesolaris.c: up to 1.4 external/bsd/ntp/dist/libparse/parsestreams.c: up to 1.4 external/bsd/ntp/dist/libparse/trim_info.c: up to 1.4 external/bsd/ntp/dist/ntpd/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/cmd_args.c: up to 1.4 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.3 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.4 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external/bsd/ntp/dist/tests/libntp/run-uglydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-vi64ops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/run-ymd2yd.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/sfptostr.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/sfptostr.cpp: delete external/bsd/ntp/dist/tests/libntp/sockaddrtest.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/libntp/sockaddrtest.h: up to 1.4 external/bsd/ntp/dist/tests/libntp/socktoa.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/socktoa.cpp: delete external/bsd/ntp/dist/tests/libntp/ssl_init.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ssl_init.cpp: delete external/bsd/ntp/dist/tests/libntp/statestr.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/statestr.cpp: delete external/bsd/ntp/dist/tests/libntp/strtolfp.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/strtolfp.cpp: delete external/bsd/ntp/dist/tests/libntp/test-libntp.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/test-libntp.h: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timespecops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timespecops.cpp: delete external/bsd/ntp/dist/tests/libntp/timestructs.cpp: delete external/bsd/ntp/dist/tests/libntp/timestructs.h: delete external/bsd/ntp/dist/tests/libntp/timevalops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/timevalops.cpp: delete external/bsd/ntp/dist/tests/libntp/tstotv.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tstotv.cpp: delete external/bsd/ntp/dist/tests/libntp/tvtots.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/tvtots.cpp: delete external/bsd/ntp/dist/tests/libntp/uglydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/uglydate.cpp: delete external/bsd/ntp/dist/tests/libntp/vi64ops.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/vi64ops.cpp: delete external/bsd/ntp/dist/tests/libntp/ymd2yd.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/libntp/ymd2yd.cpp: delete external/bsd/ntp/dist/tests/ntpd/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/tests/ntpd/leapsec.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/leapsec.cpp: delete external/bsd/ntp/dist/tests/ntpd/ntp_prio_q.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntp_restrict.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/ntpdtest.cpp: delete external/bsd/ntp/dist/tests/ntpd/ntpdtest.h: delete external/bsd/ntp/dist/tests/ntpd/rc_cmdlength.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-leapsec.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_prio_q.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-ntp_restrict.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-rc_cmdlength.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_scanner.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/run-t-ntp_signd.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_scanner.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpd/t-ntp_signd.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/Makefile.am: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/Makefile.in: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/run-t-ntpq.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/ntpq/t-ntpq.c: up to 1.1.1.1 external/bsd/ntp/dist/tests/sandbox/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/Makefile.in: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/bug-2803.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/modetoa.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/run-modetoa.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-uglydate.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/run-ut-2803.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/smeartest.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/uglydate.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sandbox/ut-2803.c: up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/Makefile.in: up to 1.1.1.2 external/bsd/ntp/dist/tests/sec-2853/run-sec-2853.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/sec-2853/sec-2853.c: up to 1.1.1.3 external/bsd/ntp/dist/util/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/util/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.5 external/bsd/ntp/dist/util/jitter.c: up to 1.4 external/bsd/ntp/dist/util/jitter.h: delete external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.10 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.5 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.9 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.5 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.5 external/bsd/ntp/dist/util/ntptime.c: up to 1.7 external/bsd/ntp/html/Makefile: up to 1.3 external/bsd/ntp/importdate: up to 1.7 external/bsd/ntp/include/config.h: up to 1.13 external/bsd/ntp/ntp2netbsd: up to 1.5 external/bsd/ntp/scripts/mkver: up to 1.7 Update ntp to 4.2.8p4. @ text @a406 14 .It Ic mdnstries Ar number If we are participating in mDNS, after we have synched for the first time we attempt to register with the mDNS system. If that registration attempt fails, we try again at one minute intervals for up to .Ic mdnstries times. After all, .Ic ntpd may be starting before mDNS. The default value for .Ic mdnstries is 5. d1894 1 a1894 1 .Xr sntp 1sntpmdoc d1986 1 a1986 1 The clustering algorithm repeatedly casts out outlier a2376 3 .It Ic dscp Ar value This option specifies the Differentiated Services Control Point (DSCP) value, a 6-bit code. The default value is 46, signifying Expedited Forwarding. a2475 13 .It Ic leapsmearinterval Ar seconds This EXPERIMENTAL option is only available if .Xr ntpd 1ntpdmdoc was built with the .Cm --enable-leap-smear option to the .Cm configure script. It specifies the interval over which a leap second correction will be applied. Recommended values for this option are between 7200 (2 hours) and 86400 (24 hours). .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS! See http://bugs.ntp.org/2855 for more information. d2609 1 a2609 3 .Cm step Ar step | .Cm stepback Ar stepback | .Cm stepfwd Ar stepfwd | a2668 13 .It Cm stepback Ar stepback The argument is the step threshold for the backward direction, which by default is 0.128 s. It can be set to any positive number in seconds. If both the forward and backward step thresholds are set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if each direction of step threshold are either set to zero or greater than .5 second. .It Cm stepfwd Ar stepfwd As for stepback, but for the forward direction. d2685 2 a2686 3 Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful d2690 1 a2690 3 The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". d2693 2 a2697 2 .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.2.4.4 log @Pull up following revision(s) (requested by spz in ticket #1380): external/bsd/ntp/importdate: up to revision 1.9 external/bsd/ntp/bin/ntpd/Makefile: up to revision 1.21 external/bsd/ntp/dist/ChangeLog: up to revision 1.1.1.9 external/bsd/ntp/dist/CommitLog: up to revision 1.1.1.9 external/bsd/ntp/dist/Makefile.am: up to revision 1.1.1.8 external/bsd/ntp/dist/Makefile.in: up to revision 1.1.1.9 external/bsd/ntp/dist/NEWS: up to revision 1.1.1.9 external/bsd/ntp/dist/README.pullrequests: up to revision 1.1.1.1 external/bsd/ntp/dist/config.h.in: up to revision 1.1.1.8 external/bsd/ntp/dist/configure: up to revision 1.1.1.9 external/bsd/ntp/dist/configure.ac: up to revision 1.1.1.8 external/bsd/ntp/dist/packageinfo.sh: up to revision 1.1.1.9 external/bsd/ntp/dist/html/authentic.html: up to revision 1.1.1.3 external/bsd/ntp/dist/html/miscopt.html: up to revision 1.1.1.8 external/bsd/ntp/dist/html/monopt.html: up to revision 1.1.1.4 external/bsd/ntp/dist/html/xleave.html: up to revision 1.1.1.4 external/bsd/ntp/dist/include/Makefile.am: up to revision 1.1.1.8 external/bsd/ntp/dist/include/Makefile.in: up to revision 1.1.1.9 external/bsd/ntp/dist/include/ntp.h: up to revision 1.6 external/bsd/ntp/dist/include/ntp_io.h: up to revision 1.5 external/bsd/ntp/dist/include/ntp_keyacc.h: up to revision 1.1.1.1 external/bsd/ntp/dist/include/ntp_refclock.h: up to revision 1.5 external/bsd/ntp/dist/include/ntp_stdlib.h: up to revision 1.13 external/bsd/ntp/dist/include/ntp_types.h: up to revision 1.6 external/bsd/ntp/dist/include/ntp_worker.h: up to revision 1.5 external/bsd/ntp/dist/include/ntpd.h: up to revision 1.8 external/bsd/ntp/dist/include/parse.h: up to revision 1.6 external/bsd/ntp/dist/include/recvbuff.h: up to revision 1.5 external/bsd/ntp/dist/include/safecast.h: up to revision 1.1.1.2 external/bsd/ntp/dist/lib/isc/backtrace.c: up to revision 1.6 external/bsd/ntp/dist/lib/isc/buffer.c: up to revision 1.4 external/bsd/ntp/dist/lib/isc/hmacmd5.c: up to revision 1.5 external/bsd/ntp/dist/lib/isc/hmacsha.c: up to revision 1.5 external/bsd/ntp/dist/lib/isc/inet_aton.c: up to revision 1.4 external/bsd/ntp/dist/lib/isc/inet_pton.c: up to revision 1.7 external/bsd/ntp/dist/lib/isc/log.c: up to revision 1.7 external/bsd/ntp/dist/lib/isc/netaddr.c: up to revision 1.9 external/bsd/ntp/dist/lib/isc/sockaddr.c: up to revision 1.7 external/bsd/ntp/dist/lib/isc/task.c: up to revision 1.4 external/bsd/ntp/dist/lib/isc/tsmemcmp.c: up to revision 1.1.1.1 external/bsd/ntp/dist/lib/isc/include/isc/string.h: up to revision 1.5 external/bsd/ntp/dist/lib/isc/win32/interfaceiter.c: up to revision 1.4 external/bsd/ntp/dist/lib/isc/win32/net.c: up to revision 1.4 external/bsd/ntp/dist/libntp/Makefile.am: up to revision 1.1.1.6 external/bsd/ntp/dist/libntp/Makefile.in: up to revision 1.1.1.9 external/bsd/ntp/dist/libntp/a_md5encrypt.c: up to revision 1.5 external/bsd/ntp/dist/libntp/atolfp.c: up to revision 1.8 external/bsd/ntp/dist/libntp/authkeys.c: up to revision 1.10 external/bsd/ntp/dist/libntp/authreadkeys.c: up to revision 1.9 external/bsd/ntp/dist/libntp/authusekey.c: up to revision 1.5 external/bsd/ntp/dist/libntp/dolfptoa.c: up to revision 1.4 external/bsd/ntp/dist/libntp/hextolfp.c: up to revision 1.7 external/bsd/ntp/dist/libntp/is_ip_address.c: up to revision 1.1.1.1 external/bsd/ntp/dist/libntp/mstolfp.c: up to revision 1.7 external/bsd/ntp/dist/libntp/msyslog.c: up to revision 1.5 external/bsd/ntp/dist/libntp/ntp_crypto_rnd.c: up to revision 1.5 external/bsd/ntp/dist/libntp/ntp_intres.c: up to revision 1.9 external/bsd/ntp/dist/libntp/ntp_lineedit.c: up to revision 1.9 external/bsd/ntp/dist/libntp/ntp_rfc2553.c: up to revision 1.5 external/bsd/ntp/dist/libntp/ntp_worker.c: up to revision 1.6 external/bsd/ntp/dist/libntp/recvbuff.c: up to revision 1.6 external/bsd/ntp/dist/libntp/snprintf.c: up to revision 1.4 external/bsd/ntp/dist/libntp/socktohost.c: up to revision 1.5 external/bsd/ntp/dist/libntp/systime.c: up to revision 1.5 external/bsd/ntp/dist/libntp/work_fork.c: up to revision 1.9 external/bsd/ntp/dist/libntp/work_thread.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_computime.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_dcf7000.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_meinberg.c: up to revision 1.6 external/bsd/ntp/dist/libparse/clk_rawdcf.c: up to revision 1.7 external/bsd/ntp/dist/libparse/clk_rcc8000.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_schmid.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_trimtaip.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_varitext.c: up to revision 1.5 external/bsd/ntp/dist/libparse/clk_wharton.c: up to revision 1.5 external/bsd/ntp/dist/libparse/parse.c: up to revision 1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to revision 1.1.1.5 external/bsd/ntp/dist/ntpd/keyword-gen.c: up to revision 1.9 external/bsd/ntp/dist/ntpd/ntp.conf.5man: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.5mdoc: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.def: up to revision 1.1.1.6 external/bsd/ntp/dist/ntpd/ntp.conf.html: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.man.in: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.conf.mdoc.in: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.5man: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.5mdoc: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.def: up to revision 1.1.1.3 external/bsd/ntp/dist/ntpd/ntp.keys.html: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.man.in: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp.keys.mdoc.in: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntp_config.c: up to revision 1.14 external/bsd/ntp/dist/ntpd/ntp_control.c: up to revision 1.16 external/bsd/ntp/dist/ntpd/ntp_crypto.c: up to revision 1.12 external/bsd/ntp/dist/ntpd/ntp_io.c: up to revision 1.22 external/bsd/ntp/dist/ntpd/ntp_keyword.h: up to revision 1.10 external/bsd/ntp/dist/ntpd/ntp_loopfilter.c: up to revision 1.9 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to revision 1.13 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to revision 1.11 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to revision 1.9 external/bsd/ntp/dist/ntpd/ntp_request.c: up to revision 1.14 external/bsd/ntp/dist/ntpd/ntp_restrict.c: up to revision 1.8 external/bsd/ntp/dist/ntpd/ntp_signd.c: up to revision 1.4 external/bsd/ntp/dist/ntpd/ntp_timer.c: up to revision 1.7 external/bsd/ntp/dist/ntpd/ntp_util.c: up to revision 1.8 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to revision 1.7 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to revision 1.10 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.c: up to revision 1.13 external/bsd/ntp/dist/ntpd/ntpd.html: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to revision 1.1.1.7 external/bsd/ntp/dist/ntpd/refclock_chu.c: up to revision 1.9 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to revision 1.9 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to revision 1.10 external/bsd/ntp/dist/ntpd/refclock_local.c: up to revision 1.5 external/bsd/ntp/dist/ntpd/refclock_parse.c: up to revision 1.18 external/bsd/ntp/dist/ntpd/refclock_shm.c: up to revision 1.8 external/bsd/ntp/dist/ntpd/refclock_true.c: up to revision 1.6 external/bsd/ntp/dist/ntpd/refclock_tsyncpci.c: up to revision 1.4 external/bsd/ntp/dist/ntpdate/ntpdate.c: up to 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external/bsd/ntp/lib/libiscntp/Makefile: up to revision 1.14 external/bsd/ntp/lib/libntp/Makefile: up to revision 1.18 external/bsd/ntp/scripts/mkver: up to revision 1.10 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch Update ntp to 4.2.8p7. @ text @d116 2 a117 8 In a few cases, including the .Cm reslist billboard generated by .Xr ntpq 1ntpqmdoc or .Xr ntpdc 1ntpdcmdoc , IPv6 addresses are automatically generated. a151 1 .Op Cm true a158 2 .Op Cm true .Op Cm xleave a165 1 .Op Cm xleave d291 1 a291 3 can be changed with the .Ic calldelay command to allow d302 1 a302 3 changed with the .Ic calldelay command to allow a334 5 .It Cm preempt Says the association can be preempted. .It Cm true Marks the server as a truechimer. Use this option only for testing. a346 5 .It Cm true Forces the association to always survive the selection and clustering algorithms. This option should almost certainly .Em only be used while testing an association. a364 6 .It Cm xleave Valid in .Cm peer and .Cm broadcast modes only, this flag enables interleave mode. d510 1 a510 1 program running on d700 1 a700 1 includes the source and destination IP addresses in message digest d898 2 a899 2 Specifies the location of the optional IFF parameters file. This overrides the link d909 2 a910 1 This overrides the link d1051 1 a1051 1 directory of the source code distribution. d1385 1 a1385 3 and the pid of the .Xr ntpd 1ntpdmdoc server process. d1428 1 a1428 3 included in the restrict list created by the .Ic restrict command d1438 1 a1438 1 an indefinite period. d1440 1 a1440 1 for an indefinite period, the only way at present to remove d1498 1 a1498 3 The .Ic monitor subcommand specifies the probability of discard d1557 1 a1557 3 in the .Ic discard command. d1617 1 a1617 3 The trap service is a subsystem of the .Xr ntpq 1ntpqmdoc control message d1684 2 a1685 5 using the .Ic manycastclient command, which is similar to the .Ic server command but with a multicast (IPv4 class d1755 1 a1755 3 set at the minimum hops specified by the .Ic ttl command. d2393 1 a2393 2 a 6-bit code. The default value is 46, signifying Expedited Forwarding. d2398 2 a2399 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early d2406 2 a2407 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early a2480 61 .It Cm unpeer_crypto_early By default, if .Xr ntpd 1ntpdmdoc receives an autokey packet that fails TEST9, a crypto failure, the association is immediately cleared. This is almost certainly a feature, but if, in spite of the current recommendation of not using autokey, you are .B still using autokey .B and you are seeing this sort of DoS attack disabling this flag will delay tearing down the association until the reachability counter becomes zero. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_crypto_nak_early By default, if .Xr ntpd 1ntpdmdoc receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the association is immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_digest_early By default, if .Xr ntpd 1ntpdmdoc receives what should be an authenticated packet that passes other packet sanity checks but contains an invalid digest the association is immediately cleared. While this is generally a feature as it allows for quick recovery, if this type of packet is carefully forged and sent during an appropriate window it can be used for a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . d2569 1 a2569 2 messages of the respective message class. Thus, a minimal log configuration d2593 1 a2593 3 This is the same operation as the .Fl l command line option. d2745 1 a2745 2 Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.2.4.5 log @Pull up following revision(s) (requested by spz in ticket #1448): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/bin/Makefile: up to 1.3 external/bsd/ntp/bin/ntpd/Makefile: up to 1.21 via patch external/bsd/ntp/bin/ntpd/ntp.keys.5: up to 1.2 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch external/bsd/ntp/bin/sntp/Makefile: up to 1.6 via patch external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.8 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.12 external/bsd/ntp/dist/CommitLog: up to 1.1.1.12 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/NEWS: up to 1.1.1.12 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.10 external/bsd/ntp/dist/adjtimed/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/clockstuff/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/config.h.in: up to 1.1.1.9 external/bsd/ntp/dist/configure: up to 1.1.1.12 external/bsd/ntp/dist/configure.ac: up to 1.1.1.10 external/bsd/ntp/dist/html/authentic.html: up to 1.1.1.3 external/bsd/ntp/dist/html/copyright.html: up to 1.1.1.6 external/bsd/ntp/dist/html/drivers/driver40-ja.html: up to 1.1.1.2 external/bsd/ntp/dist/html/drivers/driver40.html: up to 1.1.1.5 external/bsd/ntp/dist/html/miscopt.html: up to 1.1.1.10 external/bsd/ntp/dist/html/xleave.html: up to 1.1.1.4 external/bsd/ntp/dist/include/Makefile.am: up to 1.1.1.9 external/bsd/ntp/dist/include/Makefile.in: up to 1.1.1.11 external/bsd/ntp/dist/include/isc/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/include/libssl_compat.h: up to 1.1.1.2 external/bsd/ntp/dist/include/ntp.h: up to 1.8 external/bsd/ntp/dist/include/ntp_crypto.h: up to 1.5 external/bsd/ntp/dist/include/ntp_fp.h: up to 1.9 external/bsd/ntp/dist/include/ntp_intres.h: up to 1.5 external/bsd/ntp/dist/include/ntp_md5.h: up 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external/bsd/ntp/dist/libntp/recvbuff.c: up to 1.7 external/bsd/ntp/dist/libntp/ssl_init.c: up to 1.10 external/bsd/ntp/dist/libntp/statestr.c: up to 1.6 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.11 external/bsd/ntp/dist/libntp/work_thread.c: up to 1.5 external/bsd/ntp/dist/libparse/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/libparse/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.6 external/bsd/ntp/dist/libparse/clk_trimtsip.c: up to 1.6 external/bsd/ntp/dist/libparse/gpstolfp.c: up to 1.6 external/bsd/ntp/dist/ntpd/Makefile.am: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen.c: 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external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_request.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_restrict.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp_scanner.c: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_timer.c: up to 1.7 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.13 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/refclock_datum.c: up to 1.7 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.11 external/bsd/ntp/dist/ntpd/refclock_jjy.c: up to 1.12 external/bsd/ntp/dist/ntpd/refclock_jupiter.c: up to 1.11 external/bsd/ntp/dist/ntpd/refclock_mx4200.c: up to 1.5 external/bsd/ntp/dist/ntpd/refclock_nmea.c: up to 1.12 external/bsd/ntp/dist/ntpd/refclock_oncore.c: up to 1.14 external/bsd/ntp/dist/ntpd/refclock_parse.c: up to 1.20 external/bsd/ntp/dist/ntpdate/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/ntpdate/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpdate/ntpdate.c: up to 1.11 external/bsd/ntp/dist/ntpdc/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/ntpdc/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/invoke-ntpdc.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/ntpdc-opts.c: up to 1.10 external/bsd/ntp/dist/ntpdc/ntpdc-opts.h: up to 1.10 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcman: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/ntpdc.1ntpdcmdoc: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/ntpdc.c: up to 1.15 external/bsd/ntp/dist/ntpdc/ntpdc.html: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/ntpdc.man.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/ntpdc.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpdc/ntpdc_ops.c: up to 1.9 external/bsd/ntp/dist/ntpq/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/ntpq/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpq/invoke-ntpq.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpq/libntpq.c: up to 1.5 external/bsd/ntp/dist/ntpq/ntpq-opts.c: up to 1.10 external/bsd/ntp/dist/ntpq/ntpq-opts.h: up to 1.10 external/bsd/ntp/dist/ntpq/ntpq-subs.c: up to 1.15 external/bsd/ntp/dist/ntpq/ntpq.1ntpqman: up to 1.1.1.10 external/bsd/ntp/dist/ntpq/ntpq.1ntpqmdoc: up to 1.1.1.10 external/bsd/ntp/dist/ntpq/ntpq.c: up to 1.18 external/bsd/ntp/dist/ntpq/ntpq.html: up to 1.1.1.10 external/bsd/ntp/dist/ntpq/ntpq.man.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpq/ntpq.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/ntpsnmpd/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/invoke-ntpsnmpd.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.c: up to 1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd-opts.h: up to 1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdman: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.1ntpsnmpdmdoc: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.html: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.man.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/packageinfo.sh: up to 1.1.1.12 external/bsd/ntp/dist/parseutil/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/parseutil/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/build/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/scripts/build/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/scripts/build/genAuthors.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/calc_tickadj/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjman: up to 1.1.1.10 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.1calc_tickadjmdoc: up to 1.1.1.10 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.html: up to 1.1.1.10 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.man.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/calc_tickadj/calc_tickadj.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/calc_tickadj/invoke-calc_tickadj.texi: up to 1.1.1.10 external/bsd/ntp/dist/scripts/invoke-plot_summary.texi: up to 1.1.1.10 external/bsd/ntp/dist/scripts/invoke-summary.texi: up to 1.1.1.10 external/bsd/ntp/dist/scripts/lib/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntp-wait/invoke-ntp-wait.texi: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait-opts: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitman: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.1ntp-waitmdoc: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.html: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.in: up to 1.1.1.2 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.man.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntp-wait/ntp-wait.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/scripts/ntpsweep/invoke-ntpsweep.texi: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep-opts: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepman: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.1ntpsweepmdoc: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.html: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.man.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntpsweep/ntpsweep.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/scripts/ntptrace/Makefile.in: up to 1.1.1.8 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external/bsd/ntp/dist/sntp/libopts/nested.c: up to 1.10 external/bsd/ntp/dist/sntp/libopts/parse-duration.c: up to 1.9 external/bsd/ntp/dist/sntp/m4/libtool.m4: up to 1.1.1.4 external/bsd/ntp/dist/sntp/m4/ltoptions.m4: up to 1.1.1.4 external/bsd/ntp/dist/sntp/m4/ltsugar.m4: up to 1.1.1.4 external/bsd/ntp/dist/sntp/m4/ltversion.m4: up to 1.1.1.5 external/bsd/ntp/dist/sntp/m4/lt~obsolete.m4: up to 1.1.1.4 external/bsd/ntp/dist/sntp/m4/ntp_compiler.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/ntp_harden.m4: up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/ntp_libevent.m4: up to 1.1.1.6 external/bsd/ntp/dist/sntp/m4/ntp_libntp.m4: up to 1.1.1.7 external/bsd/ntp/dist/sntp/m4/ntp_openssl.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/ntp_problemtests.m4: up to 1.1.1.3 external/bsd/ntp/dist/sntp/m4/ntp_prog_cc.m4: up to 1.1.1.2 external/bsd/ntp/dist/sntp/m4/sntp_problemtests.m4: up to 1.1.1.1 external/bsd/ntp/dist/sntp/m4/version.m4: up to 1.1.1.10 external/bsd/ntp/dist/sntp/scm-rev: up to 1.1.1.5 external/bsd/ntp/dist/sntp/scripts/Makefile.am: up to 1.1.1.2 external/bsd/ntp/dist/sntp/scripts/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/scripts/genHardFlags: up to 1.1.1.1 external/bsd/ntp/dist/sntp/sntp-opts.c: up to 1.11 external/bsd/ntp/dist/sntp/sntp-opts.h: up to 1.10 external/bsd/ntp/dist/sntp/sntp.1sntpman: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.1sntpmdoc: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.html: up to 1.1.1.12 external/bsd/ntp/dist/sntp/sntp.man.in: up to 1.1.1.10 external/bsd/ntp/dist/sntp/sntp.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/sntp/tests/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/sntp/tests/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/sntp/tests/crypto.c: up to 1.1.1.6 external/bsd/ntp/dist/sntp/tests/fileHandlingTest.c: up to 1.1.1.4 external/bsd/ntp/dist/sntp/tests/keyFile.c: up to 1.1.1.6 external/bsd/ntp/dist/sntp/tests/packetHandling.c: up to 1.1.1.6 external/bsd/ntp/dist/sntp/tests/packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/tests/run-packetProcessing.c: up to 1.1.1.7 external/bsd/ntp/dist/sntp/tests/t-log.c: up to 1.1.1.3 external/bsd/ntp/dist/sntp/unity/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/sntp/unity/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/sntp/unity/ulib_setup.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/ulib_teardown.c: up to 1.1.1.1 external/bsd/ntp/dist/sntp/unity/unity_fixture.c: up to 1.1.1.5 external/bsd/ntp/dist/sntp/version.c: up to 1.1.1.9 external/bsd/ntp/dist/tests/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/tests/bug-2803/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/bug-2803/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/tests/bug-2803/run-bug-2803.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/Makefile.am: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/Makefile.in: up to 1.1.1.8 external/bsd/ntp/dist/tests/libntp/a_md5encrypt.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/buftvtots.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/caljulian.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/clocktime.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/decodenetnum.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/lfpfunc.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/netof.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/numtohost.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/octtoint.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/refidsmear.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/refnumtoa.c: up to 1.1.1.5 external/bsd/ntp/dist/tests/libntp/run-calendar.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/sfptostr.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/socktoa.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/timespecops.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/libntp/timevalops.c: up to 1.1.1.6 external/bsd/ntp/dist/tests/ntpd/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/tests/ntpd/Makefile.in: up to 1.1.1.9 external/bsd/ntp/dist/tests/ntpd/leapsec.c: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpd/t-ntp_signd.c: up to 1.1.1.4 external/bsd/ntp/dist/tests/ntpq/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/ntpq/Makefile.in: up to 1.1.1.4 external/bsd/ntp/dist/tests/sandbox/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/sandbox/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/tests/sec-2853/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/tests/sec-2853/Makefile.in: up to 1.1.1.5 external/bsd/ntp/dist/util/Makefile.am: up to 1.1.1.6 external/bsd/ntp/dist/util/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/util/invoke-ntp-keygen.texi: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen-opts.c: up to 1.15 external/bsd/ntp/dist/util/ntp-keygen-opts.h: up to 1.10 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenman: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.1ntp-keygenmdoc: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.12 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.10 external/bsd/ntp/importdate: up to 1.12 external/bsd/ntp/include/config.h: up to 1.19 external/bsd/ntp/lib/libntp/Makefile: up to 1.19 external/bsd/ntp/lib/libopts/Makefile: up to 1.14 external/bsd/ntp/scripts/mkver: up to 1.13 Update ntp to 4.2.8p10. @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. a2444 1 .Cm peer_clear_digest_early | a2453 1 .Cm peer_clear_digest_early | a2520 20 .It Cm peer_clear_digest_early By default, if .Xr ntpd 1ntpdmdoc is using autokey and it receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the peer variables are immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . @ 1.1.1.2.2.1 log @file ntp.conf.def was added on branch netbsd-6-1 on 2014-12-25 02:13:06 +0000 @ text @d1 2795 @ 1.1.1.2.2.2 log @Apply patch (requested by christos in ticket #1221): Update ntp to 4.2.8. @ text @a0 2795 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, eight kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. It also includes .Cm pool associations, so if you want to use servers from a .Cm pool directive and also want to use .Cm nopeer by default, you'll want a .Cm "restrict source ..." line as well that does .It not include the .Cm nopeer directive. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm mode7 | monitor | .Cm ntp | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm mode7 Enables processing of NTP mode 7 implementation-specific requests which are used by the deprecated .Xr ntpdc 1ntpdcmdoc program. The default for this flag is disable. This flag is excluded from runtime configuration using .Xr ntpq 1ntpqmdoc . The .Xr ntpq 1ntpqmdoc program provides the same capabilities as .Xr ntpdc 1ntpdcmdoc using standard mode 6 requests. .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.2.2.3 log @Pull up following revision(s) (requested by christos in ticket #1342): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.15 external/bsd/ntp/bin/ntpd/Makefile: up to 1.19 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch external/bsd/ntp/bin/sntp/Makefile: up to 1.6 external/bsd/ntp/bin/sntp/event2/event-config.h: delete external/bsd/ntp/bin/sntp/evlog.c: delete external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.5 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.7 external/bsd/ntp/dist/CommitLog: up to 1.1.1.7 external/bsd/ntp/dist/Makefile.am: up to 1.1.1.7 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/NEWS: up to 1.1.1.7 external/bsd/ntp/dist/README.leapsmear: up to 1.1.1.1 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.7 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/adjtimed/adjtimed.c: up to 1.4 external/bsd/ntp/dist/bootstrap: up to 1.1.1.5 external/bsd/ntp/dist/build: up to 1.1.1.5 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 1.1.1.7 external/bsd/ntp/dist/clockstuff/chutest.c: up to 1.4 external/bsd/ntp/dist/clockstuff/propdelay.c: up to 1.4 external/bsd/ntp/dist/config.h.in: up to 1.1.1.6 external/bsd/ntp/dist/configure: up to 1.1.1.7 external/bsd/ntp/dist/configure.ac: up to 1.1.1.7 external/bsd/ntp/dist/html/build.html: up to 1.1.1.4 external/bsd/ntp/dist/html/confopt.html: up to 1.1.1.4 external/bsd/ntp/dist/html/copyright.html: up to 1.1.1.5 external/bsd/ntp/dist/html/decode.html: up to 1.1.1.5 external/bsd/ntp/dist/html/drivers/driver22.html: up to 1.1.1.4 external/bsd/ntp/dist/html/drivers/driver28.html: up to 1.1.1.4 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external/bsd/ntp/dist/ntpd/ntp_leapsec.h: up to 1.3 external/bsd/ntp/dist/ntpd/ntp_loopfilter.c: up to 1.8 external/bsd/ntp/dist/ntpd/ntp_monitor.c: up to 1.4 external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.11 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.8 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.8 external/bsd/ntp/dist/ntpd/ntp_request.c: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_restrict.c: up to 1.7 external/bsd/ntp/dist/ntpd/ntp_scanner.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp_scanner.h: up to 1.3 external/bsd/ntp/dist/ntpd/ntp_timer.c: up to 1.5 external/bsd/ntp/dist/ntpd/ntp_util.c: up to 1.7 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.5 external/bsd/ntp/dist/ntpd/ntpd-opts.def: up to 1.1.1.4 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.8 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/ntpd.c: up to 1.11 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external/bsd/ntp/html/Makefile: up to 1.3 external/bsd/ntp/importdate: up to 1.7 external/bsd/ntp/include/config.h: up to 1.13 external/bsd/ntp/ntp2netbsd: up to 1.5 external/bsd/ntp/scripts/mkver: up to 1.7 Update ntp to 4.2.8p4. @ text @a406 14 .It Ic mdnstries Ar number If we are participating in mDNS, after we have synched for the first time we attempt to register with the mDNS system. If that registration attempt fails, we try again at one minute intervals for up to .Ic mdnstries times. After all, .Ic ntpd may be starting before mDNS. The default value for .Ic mdnstries is 5. d1894 1 a1894 1 .Xr sntp 1sntpmdoc d1986 1 a1986 1 The clustering algorithm repeatedly casts out outlier a2376 3 .It Ic dscp Ar value This option specifies the Differentiated Services Control Point (DSCP) value, a 6-bit code. The default value is 46, signifying Expedited Forwarding. a2475 13 .It Ic leapsmearinterval Ar seconds This EXPERIMENTAL option is only available if .Xr ntpd 1ntpdmdoc was built with the .Cm --enable-leap-smear option to the .Cm configure script. It specifies the interval over which a leap second correction will be applied. Recommended values for this option are between 7200 (2 hours) and 86400 (24 hours). .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS! See http://bugs.ntp.org/2855 for more information. d2609 1 a2609 3 .Cm step Ar step | .Cm stepback Ar stepback | .Cm stepfwd Ar stepfwd | a2668 13 .It Cm stepback Ar stepback The argument is the step threshold for the backward direction, which by default is 0.128 s. It can be set to any positive number in seconds. If both the forward and backward step thresholds are set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if each direction of step threshold are either set to zero or greater than .5 second. .It Cm stepfwd Ar stepfwd As for stepback, but for the forward direction. d2685 2 a2686 3 Specify the number of megabytes of memory that should be allocated and locked. Probably only available under Linux, this option may be useful d2690 1 a2690 3 The default is 32 megabytes on non-Linux machines, and -1 under Linux. -1 means "do not lock the process into memory". 0 means "lock whatever memory the process wants into memory". d2693 2 a2697 2 .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.2.2.4 log @Pull up following revision(s) (requested by spz in ticket #1380): external/bsd/ntp/importdate: up to revision 1.9 external/bsd/ntp/bin/ntpd/Makefile: up to revision 1.21 external/bsd/ntp/dist/ChangeLog: up to revision 1.1.1.9 external/bsd/ntp/dist/CommitLog: up to revision 1.1.1.9 external/bsd/ntp/dist/Makefile.am: up to revision 1.1.1.8 external/bsd/ntp/dist/Makefile.in: up to revision 1.1.1.9 external/bsd/ntp/dist/NEWS: up to revision 1.1.1.9 external/bsd/ntp/dist/README.pullrequests: up to revision 1.1.1.1 external/bsd/ntp/dist/config.h.in: up to revision 1.1.1.8 external/bsd/ntp/dist/configure: up to revision 1.1.1.9 external/bsd/ntp/dist/configure.ac: up to revision 1.1.1.8 external/bsd/ntp/dist/packageinfo.sh: up to revision 1.1.1.9 external/bsd/ntp/dist/html/authentic.html: up to revision 1.1.1.3 external/bsd/ntp/dist/html/miscopt.html: up to revision 1.1.1.8 external/bsd/ntp/dist/html/monopt.html: up to revision 1.1.1.4 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external/bsd/ntp/lib/libiscntp/Makefile: up to revision 1.14 external/bsd/ntp/lib/libntp/Makefile: up to revision 1.18 external/bsd/ntp/scripts/mkver: up to revision 1.10 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch Update ntp to 4.2.8p7. @ text @d116 2 a117 8 In a few cases, including the .Cm reslist billboard generated by .Xr ntpq 1ntpqmdoc or .Xr ntpdc 1ntpdcmdoc , IPv6 addresses are automatically generated. a151 1 .Op Cm true a158 2 .Op Cm true .Op Cm xleave a165 1 .Op Cm xleave d291 1 a291 3 can be changed with the .Ic calldelay command to allow d302 1 a302 3 changed with the .Ic calldelay command to allow a334 5 .It Cm preempt Says the association can be preempted. .It Cm true Marks the server as a truechimer. Use this option only for testing. a346 5 .It Cm true Forces the association to always survive the selection and clustering algorithms. This option should almost certainly .Em only be used while testing an association. a364 6 .It Cm xleave Valid in .Cm peer and .Cm broadcast modes only, this flag enables interleave mode. d510 1 a510 1 program running on d700 1 a700 1 includes the source and destination IP addresses in message digest d898 2 a899 2 Specifies the location of the optional IFF parameters file. This overrides the link d909 2 a910 1 This overrides the link d1051 1 a1051 1 directory of the source code distribution. d1385 1 a1385 3 and the pid of the .Xr ntpd 1ntpdmdoc server process. d1428 1 a1428 3 included in the restrict list created by the .Ic restrict command d1438 1 a1438 1 an indefinite period. d1440 1 a1440 1 for an indefinite period, the only way at present to remove d1498 1 a1498 3 The .Ic monitor subcommand specifies the probability of discard d1557 1 a1557 3 in the .Ic discard command. d1617 1 a1617 3 The trap service is a subsystem of the .Xr ntpq 1ntpqmdoc control message d1684 2 a1685 5 using the .Ic manycastclient command, which is similar to the .Ic server command but with a multicast (IPv4 class d1755 1 a1755 3 set at the minimum hops specified by the .Ic ttl command. d2393 1 a2393 2 a 6-bit code. The default value is 46, signifying Expedited Forwarding. d2398 2 a2399 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early d2406 2 a2407 3 .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early a2480 61 .It Cm unpeer_crypto_early By default, if .Xr ntpd 1ntpdmdoc receives an autokey packet that fails TEST9, a crypto failure, the association is immediately cleared. This is almost certainly a feature, but if, in spite of the current recommendation of not using autokey, you are .B still using autokey .B and you are seeing this sort of DoS attack disabling this flag will delay tearing down the association until the reachability counter becomes zero. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_crypto_nak_early By default, if .Xr ntpd 1ntpdmdoc receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the association is immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . .It Cm unpeer_digest_early By default, if .Xr ntpd 1ntpdmdoc receives what should be an authenticated packet that passes other packet sanity checks but contains an invalid digest the association is immediately cleared. While this is generally a feature as it allows for quick recovery, if this type of packet is carefully forged and sent during an appropriate window it can be used for a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . d2569 1 a2569 2 messages of the respective message class. Thus, a minimal log configuration d2593 1 a2593 3 This is the same operation as the .Fl l command line option. d2745 1 a2745 2 Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. @ 1.1.1.2.2.5 log @Pull up following revision(s) (requested by spz in ticket #1448): doc/3RDPARTY: patch external/bsd/ntp/Makefile.inc: up to 1.16 via patch external/bsd/ntp/bin/Makefile: up to 1.3 external/bsd/ntp/bin/ntpd/Makefile: up to 1.21 via patch external/bsd/ntp/bin/ntpd/ntp.keys.5: up to 1.2 external/bsd/ntp/bin/ntpd/ntp_parser.c: patch external/bsd/ntp/bin/ntpd/ntp_parser.h: patch external/bsd/ntp/bin/sntp/Makefile: up to 1.6 via patch external/bsd/ntp/dist/COPYRIGHT: up to 1.1.1.8 external/bsd/ntp/dist/ChangeLog: up to 1.1.1.12 external/bsd/ntp/dist/CommitLog: up to 1.1.1.12 external/bsd/ntp/dist/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/NEWS: up to 1.1.1.12 external/bsd/ntp/dist/aclocal.m4: up to 1.1.1.10 external/bsd/ntp/dist/adjtimed/Makefile.am: up to 1.1.1.4 external/bsd/ntp/dist/adjtimed/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/clockstuff/Makefile.am: up to 1.1.1.3 external/bsd/ntp/dist/clockstuff/Makefile.in: up to 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external/bsd/ntp/dist/libntp/recvbuff.c: up to 1.7 external/bsd/ntp/dist/libntp/ssl_init.c: up to 1.10 external/bsd/ntp/dist/libntp/statestr.c: up to 1.6 external/bsd/ntp/dist/libntp/work_fork.c: up to 1.11 external/bsd/ntp/dist/libntp/work_thread.c: up to 1.5 external/bsd/ntp/dist/libparse/Makefile.am: up to 1.1.1.5 external/bsd/ntp/dist/libparse/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/libparse/clk_hopf6021.c: up to 1.6 external/bsd/ntp/dist/libparse/clk_trimtsip.c: up to 1.6 external/bsd/ntp/dist/libparse/gpstolfp.c: up to 1.6 external/bsd/ntp/dist/ntpd/Makefile.am: up to 1.1.1.8 external/bsd/ntp/dist/ntpd/Makefile.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/complete.conf.in: up to 1.1.1.5 external/bsd/ntp/dist/ntpd/invoke-ntp.conf.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/invoke-ntp.keys.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/invoke-ntpd.texi: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/keyword-gen-utd: up to 1.1.1.7 external/bsd/ntp/dist/ntpd/keyword-gen.c: 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external/bsd/ntp/dist/ntpd/ntp_parser.y: up to 1.16 external/bsd/ntp/dist/ntpd/ntp_peer.c: up to 1.11 external/bsd/ntp/dist/ntpd/ntp_proto.c: up to 1.15 external/bsd/ntp/dist/ntpd/ntp_refclock.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntp_request.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntp_restrict.c: up to 1.9 external/bsd/ntp/dist/ntpd/ntp_scanner.c: up to 1.12 external/bsd/ntp/dist/ntpd/ntp_timer.c: up to 1.7 external/bsd/ntp/dist/ntpd/ntpd-opts.c: up to 1.10 external/bsd/ntp/dist/ntpd/ntpd-opts.h: up to 1.13 external/bsd/ntp/dist/ntpd/ntpd.1ntpdman: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.1ntpdmdoc: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.c: up to 1.14 external/bsd/ntp/dist/ntpd/ntpd.html: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.man.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/ntpd.mdoc.in: up to 1.1.1.10 external/bsd/ntp/dist/ntpd/refclock_datum.c: up to 1.7 external/bsd/ntp/dist/ntpd/refclock_gpsdjson.c: up to 1.11 external/bsd/ntp/dist/ntpd/refclock_jjy.c: 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external/bsd/ntp/dist/util/ntp-keygen.c: up to 1.12 external/bsd/ntp/dist/util/ntp-keygen.html: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.man.in: up to 1.1.1.10 external/bsd/ntp/dist/util/ntp-keygen.mdoc.in: up to 1.1.1.10 external/bsd/ntp/importdate: up to 1.12 external/bsd/ntp/include/config.h: up to 1.19 external/bsd/ntp/lib/libntp/Makefile: up to 1.19 external/bsd/ntp/lib/libopts/Makefile: up to 1.14 external/bsd/ntp/scripts/mkver: up to 1.13 Update ntp to 4.2.8p10. @ text @a1999 19 .Ss Broadcast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm bcpollbstep Ar gate .Oc .Xc This command provides a way to delay, by the specified number of broadcast poll intervals, believing backward time steps from a broadcast server. Broadcast time networks are expected to be trusted. In the event a broadcast server's time is stepped backwards, there is clear benefit to having the clients notice this change as soon as possible. Attacks such as replay attacks can happen, however, and even though there are a number of protections built in to broadcast mode, attempts to perform a replay attack are possible. This value defaults to 0, but can be changed to any number of poll intervals between 0 and 4. a2444 1 .Cm peer_clear_digest_early | a2453 1 .Cm peer_clear_digest_early | a2520 20 .It Cm peer_clear_digest_early By default, if .Xr ntpd 1ntpdmdoc is using autokey and it receives a crypto-NAK packet that passes the duplicate packet and origin timestamp checks the peer variables are immediately cleared. While this is generally a feature as it allows for quick recovery if a server key has changed, a properly forged and appropriately delivered crypto-NAK packet can be used in a DoS attack. If you have active noticable problems with this type of DoS attack then you should consider disabling this option. You can check your .Cm peerstats file for evidence of any of these attacks. The default for this flag is .Ic enable . @ 1.1.1.1.8.1 log @file ntp.conf.def was added on branch tls-maxphys on 2014-08-19 23:51:41 +0000 @ text @d1 2782 @ 1.1.1.1.8.2 log @Rebase to HEAD as of a few days ago. @ text @a0 2782 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, four kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm monitor | Cm ntp | .Cm pps | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm monitor | Cm ntp | .Cm pps | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm pps Enables the pulse-per-second (PPS) signal when frequency and time is disciplined by the precision time kernel modifications. See the .Qq A Kernel Model for Precision Timekeeping (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page for further information. The default for this flag is .Ic disable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document corresponds to version #VERSION# of NTP. This document was derived from FreeBSD. _END_MDOC_NOTES; }; @ 1.1.1.1.4.1 log @file ntp.conf.def was added on branch yamt-pagecache on 2014-05-22 15:50:09 +0000 @ text @d1 2782 @ 1.1.1.1.4.2 log @sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments") @ text @a0 2782 /* -*- Mode: Text -*- */ autogen definitions options; #include copyright.def // We want the synopsis to be "/etc/ntp.conf" but we need the prog-name // to be ntp.conf - the latter is also how autogen produces the output // file name. prog-name = "ntp.conf"; file-path = "/etc/ntp.conf"; prog-title = "Network Time Protocol (NTP) daemon configuration file format"; /* explain: Additional information whenever the usage routine is invoked */ explain = <<- _END_EXPLAIN _END_EXPLAIN; doc-section = { ds-type = 'DESCRIPTION'; ds-format = 'mdoc'; ds-text = <<- _END_PROG_MDOC_DESCRIP The .Nm configuration file is read at initial startup by the .Xr ntpd 1ntpdmdoc daemon in order to specify the synchronization sources, modes and other related information. Usually, it is installed in the .Pa /etc directory, but could be installed elsewhere (see the daemon's .Fl c command line option). .Pp The file format is similar to other .Ux configuration files. Comments begin with a .Ql # character and extend to the end of the line; blank lines are ignored. Configuration commands consist of an initial keyword followed by a list of arguments, some of which may be optional, separated by whitespace. Commands may not be continued over multiple lines. Arguments may be host names, host addresses written in numeric, dotted-quad form, integers, floating point numbers (when specifying times in seconds) and text strings. .Pp The rest of this page describes the configuration and control options. The .Qq Notes on Configuring NTP and Setting up an NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) contains an extended discussion of these options. In addition to the discussion of general .Sx Configuration Options , there are sections describing the following supported functionality and the options used to control it: .Bl -bullet -offset indent .It .Sx Authentication Support .It .Sx Monitoring Support .It .Sx Access Control Support .It .Sx Automatic NTP Configuration Options .It .Sx Reference Clock Support .It .Sx Miscellaneous Options .El .Pp Following these is a section describing .Sx Miscellaneous Options . While there is a rich set of options available, the only required option is one or more .Ic pool , .Ic server , .Ic peer , .Ic broadcast or .Ic manycastclient commands. .Sh Configuration Support Following is a description of the configuration commands in NTPv4. These commands have the same basic functions as in NTPv3 and in some cases new functions and new arguments. There are two classes of commands, configuration commands that configure a persistent association with a remote server or peer or reference clock, and auxiliary commands that specify environmental variables that control various related operations. .Ss Configuration Commands The various modes are determined by the command keyword and the type of the required IP address. Addresses are classed by type as (s) a remote server or peer (IPv4 class A, B and C), (b) the broadcast address of a local interface, (m) a multicast address (IPv4 class D), or (r) a reference clock address (127.127.x.x). Note that only those options applicable to each command are listed below. Use of options not listed may not be caught as an error, but may result in some weird and even destructive behavior. .Pp If the Basic Socket Interface Extensions for IPv6 (RFC-2553) is detected, support for the IPv6 address family is generated in addition to the default support of the IPv4 address family. In a few cases, including the reslist billboard generated by ntpdc, IPv6 addresses are automatically generated. IPv6 addresses can be identified by the presence of colons .Dq \&: in the address field. IPv6 addresses can be used almost everywhere where IPv4 addresses can be used, with the exception of reference clock addresses, which are always IPv4. .Pp Note that in contexts where a host name is expected, a .Fl 4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace, while a .Fl 6 qualifier forces DNS resolution to the IPv6 namespace. See IPv6 references for the equivalent classes for that address family. .Bl -tag -width indent .It Xo Ic pool Ar address .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic server Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm burst .Op Cm iburst .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic peer Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Xc .It Xo Ic broadcast Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm ttl Ar ttl .Xc .It Xo Ic manycastclient Ar address .Op Cm key Ar key \&| Cm autokey .Op Cm version Ar version .Op Cm prefer .Op Cm minpoll Ar minpoll .Op Cm maxpoll Ar maxpoll .Op Cm ttl Ar ttl .Xc .El .Pp These five commands specify the time server name or address to be used and the mode in which to operate. The .Ar address can be either a DNS name or an IP address in dotted-quad notation. Additional information on association behavior can be found in the .Qq Association Management page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Bl -tag -width indent .It Ic pool For type s addresses, this command mobilizes a persistent client mode association with a number of remote servers. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. .It Ic server For type s and r addresses, this command mobilizes a persistent client mode association with the specified remote server or local radio clock. In this mode the local clock can synchronized to the remote server, but the remote server can never be synchronized to the local clock. This command should .Em not be used for type b or m addresses. .It Ic peer For type s addresses (only), this command mobilizes a persistent symmetric-active mode association with the specified remote peer. In this mode the local clock can be synchronized to the remote peer or the remote peer can be synchronized to the local clock. This is useful in a network of servers where, depending on various failure scenarios, either the local or remote peer may be the better source of time. This command should NOT be used for type b, m or r addresses. .It Ic broadcast For type b and m addresses (only), this command mobilizes a persistent broadcast mode association. Multiple commands can be used to specify multiple local broadcast interfaces (subnets) and/or multiple multicast groups. Note that local broadcast messages go only to the interface associated with the subnet specified, but multicast messages go to all interfaces. In broadcast mode the local server sends periodic broadcast messages to a client population at the .Ar address specified, which is usually the broadcast address on (one of) the local network(s) or a multicast address assigned to NTP. The IANA has assigned the multicast group address IPv4 224.0.1.1 and IPv6 ff05::101 (site local) exclusively to NTP, but other nonconflicting addresses can be used to contain the messages within administrative boundaries. Ordinarily, this specification applies only to the local server operating as a sender; for operation as a broadcast client, see the .Ic broadcastclient or .Ic multicastclient commands below. .It Ic manycastclient For type m addresses (only), this command mobilizes a manycast client mode association for the multicast address specified. In this case a specific address must be supplied which matches the address used on the .Ic manycastserver command for the designated manycast servers. The NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to avoid spraying large areas of the Internet with these messages and causing a possibly massive implosion of replies at the sender. The .Ic manycastserver command specifies that the local server is to operate in client mode with the remote servers that are discovered as the result of broadcast/multicast messages. The client broadcasts a request message to the group address associated with the specified .Ar address and specifically enabled servers respond to these messages. The client selects the servers providing the best time and continues as with the .Ic server command. The remaining servers are discarded as if never heard. .El .Pp Options: .Bl -tag -width indent .It Cm autokey All packets sent to and received from the server or peer are to include authentication fields encrypted using the autokey scheme described in .Sx Authentication Options . .It Cm burst when the server is reachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to improve timekeeping quality with the .Ic server command and s addresses. .It Cm iburst When the server is unreachable, send a burst of eight packets instead of the usual one. The packet spacing is normally 2 s; however, the spacing between the first two packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. This is designed to speed the initial synchronization acquisition with the .Ic server command and s addresses and when .Xr ntpd 1ntpdmdoc is started with the .Fl q option. .It Cm key Ar key All packets sent to and received from the server or peer are to include authentication fields encrypted using the specified .Ar key identifier with values from 1 to 65534, inclusive. The default is to include no encryption field. .It Cm minpoll Ar minpoll .It Cm maxpoll Ar maxpoll These options specify the minimum and maximum poll intervals for NTP messages, as a power of 2 in seconds The maximum poll interval defaults to 10 (1,024 s), but can be increased by the .Cm maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6 (64 s), but can be decreased by the .Cm minpoll option to a lower limit of 4 (16 s). .It Cm noselect Marks the server as unused, except for display purposes. The server is discarded by the selection algroithm. .It Cm prefer Marks the server as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm ttl Ar ttl This option is used only with broadcast server and manycast client modes. It specifies the time-to-live .Ar ttl to use on broadcast server and multicast server and the maximum .Ar ttl for the expanding ring search with manycast client packets. Selection of the proper value, which defaults to 127, is something of a black art and should be coordinated with the network administrator. .It Cm version Ar version Specifies the version number to be used for outgoing NTP packets. Versions 1-4 are the choices, with version 4 the default. .El .Ss Auxiliary Commands .Bl -tag -width indent .It Ic broadcastclient This command enables reception of broadcast server messages to any local interface (type b) address. Upon receiving a message for the first time, the broadcast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding broadcast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic manycastserver Ar address ... This command enables reception of manycast client messages to the multicast group address(es) (type m) specified. At least one address is required, but the NTP multicast address 224.0.1.1 assigned by the IANA should NOT be used, unless specific means are taken to limit the span of the reply and avoid a possibly massive implosion at the original sender. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .It Ic multicastclient Ar address ... This command enables reception of multicast server messages to the multicast group address(es) (type m) specified. Upon receiving a message for the first time, the multicast client measures the nominal server propagation delay using a brief client/server exchange with the server, then enters the broadcast client mode, in which it synchronizes to succeeding multicast messages. Note that, in order to avoid accidental or malicious disruption in this mode, both the server and client should operate using symmetric-key or public-key authentication as described in .Sx Authentication Options . .El .Sh Authentication Support Authentication support allows the NTP client to verify that the server is in fact known and trusted and not an intruder intending accidentally or on purpose to masquerade as that server. The NTPv3 specification RFC-1305 defines a scheme which provides cryptographic authentication of received NTP packets. Originally, this was done using the Data Encryption Standard (DES) algorithm operating in Cipher Block Chaining (CBC) mode, commonly called DES-CBC. Subsequently, this was replaced by the RSA Message Digest 5 (MD5) algorithm using a private key, commonly called keyed-MD5. Either algorithm computes a message digest, or one-way hash, which can be used to verify the server has the correct private key and key identifier. .Pp NTPv4 retains the NTPv3 scheme, properly described as symmetric key cryptography and, in addition, provides a new Autokey scheme based on public key cryptography. Public key cryptography is generally considered more secure than symmetric key cryptography, since the security is based on a private value which is generated by each server and never revealed. With Autokey all key distribution and management functions involve only public values, which considerably simplifies key distribution and storage. Public key management is based on X.509 certificates, which can be provided by commercial services or produced by utility programs in the OpenSSL software library or the NTPv4 distribution. .Pp While the algorithms for symmetric key cryptography are included in the NTPv4 distribution, public key cryptography requires the OpenSSL software library to be installed before building the NTP distribution. Directions for doing that are on the Building and Installing the Distribution page. .Pp Authentication is configured separately for each association using the .Cm key or .Cm autokey subcommand on the .Ic peer , .Ic server , .Ic broadcast and .Ic manycastclient configuration commands as described in .Sx Configuration Options page. The authentication options described below specify the locations of the key files, if other than default, which symmetric keys are trusted and the interval between various operations, if other than default. .Pp Authentication is always enabled, although ineffective if not configured as described below. If a NTP packet arrives including a message authentication code (MAC), it is accepted only if it passes all cryptographic checks. The checks require correct key ID, key value and message digest. If the packet has been modified in any way or replayed by an intruder, it will fail one or more of these checks and be discarded. Furthermore, the Autokey scheme requires a preliminary protocol exchange to obtain the server certificate, verify its credentials and initialize the protocol .Pp The .Cm auth flag controls whether new associations or remote configuration commands require cryptographic authentication. This flag can be set or reset by the .Ic enable and .Ic disable commands and also by remote configuration commands sent by a .Xr ntpdc 1ntpdcmdoc program running in another machine. If this flag is enabled, which is the default case, new broadcast client and symmetric passive associations and remote configuration commands must be cryptographically authenticated using either symmetric key or public key cryptography. If this flag is disabled, these operations are effective even if not cryptographic authenticated. It should be understood that operating with the .Ic auth flag disabled invites a significant vulnerability where a rogue hacker can masquerade as a falseticker and seriously disrupt system timekeeping. It is important to note that this flag has no purpose other than to allow or disallow a new association in response to new broadcast and symmetric active messages and remote configuration commands and, in particular, the flag has no effect on the authentication process itself. .Pp An attractive alternative where multicast support is available is manycast mode, in which clients periodically troll for servers as described in the .Sx Automatic NTP Configuration Options page. Either symmetric key or public key cryptographic authentication can be used in this mode. The principle advantage of manycast mode is that potential servers need not be configured in advance, since the client finds them during regular operation, and the configuration files for all clients can be identical. .Pp The security model and protocol schemes for both symmetric key and public key cryptography are summarized below; further details are in the briefings, papers and reports at the NTP project page linked from .Li http://www.ntp.org/ . .Ss Symmetric-Key Cryptography The original RFC-1305 specification allows any one of possibly 65,534 keys, each distinguished by a 32-bit key identifier, to authenticate an association. The servers and clients involved must agree on the key and key identifier to authenticate NTP packets. Keys and related information are specified in a key file, usually called .Pa ntp.keys , which must be distributed and stored using secure means beyond the scope of the NTP protocol itself. Besides the keys used for ordinary NTP associations, additional keys can be used as passwords for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. .Pp When .Xr ntpd 1ntpdmdoc is first started, it reads the key file specified in the .Ic keys configuration command and installs the keys in the key cache. However, individual keys must be activated with the .Ic trusted command before use. This allows, for instance, the installation of possibly several batches of keys and then activating or deactivating each batch remotely using .Xr ntpdc 1ntpdcmdoc . This also provides a revocation capability that can be used if a key becomes compromised. The .Ic requestkey command selects the key used as the password for the .Xr ntpdc 1ntpdcmdoc utility, while the .Ic controlkey command selects the key used as the password for the .Xr ntpq 1ntpqmdoc utility. .Ss Public Key Cryptography NTPv4 supports the original NTPv3 symmetric key scheme described in RFC-1305 and in addition the Autokey protocol, which is based on public key cryptography. The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using MD5 message digests and verifies the source with digital signatures and any of several digest/signature schemes. Optional identity schemes described on the Identity Schemes page and based on cryptographic challenge/response algorithms are also available. Using all of these schemes provides strong security against replay with or without modification, spoofing, masquerade and most forms of clogging attacks. .\" .Pp .\" The cryptographic means necessary for all Autokey operations .\" is provided by the OpenSSL software library. .\" This library is available from http://www.openssl.org/ .\" and can be installed using the procedures outlined .\" in the Building and Installing the Distribution page. .\" Once installed, .\" the configure and build .\" process automatically detects the library and links .\" the library routines required. .Pp The Autokey protocol has several modes of operation corresponding to the various NTP modes supported. Most modes use a special cookie which can be computed independently by the client and server, but encrypted in transmission. All modes use in addition a variant of the S-KEY scheme, in which a pseudo-random key list is generated and used in reverse order. These schemes are described along with an executive summary, current status, briefing slides and reading list on the .Sx Autonomous Authentication page. .Pp The specific cryptographic environment used by Autokey servers and clients is determined by a set of files and soft links generated by the .Xr ntp-keygen 1ntpkeygenmdoc program. This includes a required host key file, required certificate file and optional sign key file, leapsecond file and identity scheme files. The digest/signature scheme is specified in the X.509 certificate along with the matching sign key. There are several schemes available in the OpenSSL software library, each identified by a specific string such as .Cm md5WithRSAEncryption , which stands for the MD5 message digest with RSA encryption scheme. The current NTP distribution supports all the schemes in the OpenSSL library, including those based on RSA and DSA digital signatures. .Pp NTP secure groups can be used to define cryptographic compartments and security hierarchies. It is important that every host in the group be able to construct a certificate trail to one or more trusted hosts in the same group. Each group host runs the Autokey protocol to obtain the certificates for all hosts along the trail to one or more trusted hosts. This requires the configuration file in all hosts to be engineered so that, even under anticipated failure conditions, the NTP subnet will form such that every group host can find a trail to at least one trusted host. .Ss Naming and Addressing It is important to note that Autokey does not use DNS to resolve addresses, since DNS can't be completely trusted until the name servers have synchronized clocks. The cryptographic name used by Autokey to bind the host identity credentials and cryptographic values must be independent of interface, network and any other naming convention. The name appears in the host certificate in either or both the subject and issuer fields, so protection against DNS compromise is essential. .Pp By convention, the name of an Autokey host is the name returned by the Unix .Xr gethostname 2 system call or equivalent in other systems. By the system design model, there are no provisions to allow alternate names or aliases. However, this is not to say that DNS aliases, different names for each interface, etc., are constrained in any way. .Pp It is also important to note that Autokey verifies authenticity using the host name, network address and public keys, all of which are bound together by the protocol specifically to deflect masquerade attacks. For this reason Autokey includes the source and destinatino IP addresses in message digest computations and so the same addresses must be available at both the server and client. For this reason operation with network address translation schemes is not possible. This reflects the intended robust security model where government and corporate NTP servers are operated outside firewall perimeters. .Ss Operation A specific combination of authentication scheme (none, symmetric key, public key) and identity scheme is called a cryptotype, although not all combinations are compatible. There may be management configurations where the clients, servers and peers may not all support the same cryptotypes. A secure NTPv4 subnet can be configured in many ways while keeping in mind the principles explained above and in this section. Note however that some cryptotype combinations may successfully interoperate with each other, but may not represent good security practice. .Pp The cryptotype of an association is determined at the time of mobilization, either at configuration time or some time later when a message of appropriate cryptotype arrives. When mobilized by a .Ic server or .Ic peer configuration command and no .Ic key or .Ic autokey subcommands are present, the association is not authenticated; if the .Ic key subcommand is present, the association is authenticated using the symmetric key ID specified; if the .Ic autokey subcommand is present, the association is authenticated using Autokey. .Pp When multiple identity schemes are supported in the Autokey protocol, the first message exchange determines which one is used. The client request message contains bits corresponding to which schemes it has available. The server response message contains bits corresponding to which schemes it has available. Both server and client match the received bits with their own and select a common scheme. .Pp Following the principle that time is a public value, a server responds to any client packet that matches its cryptotype capabilities. Thus, a server receiving an unauthenticated packet will respond with an unauthenticated packet, while the same server receiving a packet of a cryptotype it supports will respond with packets of that cryptotype. However, unconfigured broadcast or manycast client associations or symmetric passive associations will not be mobilized unless the server supports a cryptotype compatible with the first packet received. By default, unauthenticated associations will not be mobilized unless overridden in a decidedly dangerous way. .Pp Some examples may help to reduce confusion. Client Alice has no specific cryptotype selected. Server Bob has both a symmetric key file and minimal Autokey files. Alice's unauthenticated messages arrive at Bob, who replies with unauthenticated messages. Cathy has a copy of Bob's symmetric key file and has selected key ID 4 in messages to Bob. Bob verifies the message with his key ID 4. If it's the same key and the message is verified, Bob sends Cathy a reply authenticated with that key. If verification fails, Bob sends Cathy a thing called a crypto-NAK, which tells her something broke. She can see the evidence using the .Xr ntpq 1ntpqmdoc program. .Pp Denise has rolled her own host key and certificate. She also uses one of the identity schemes as Bob. She sends the first Autokey message to Bob and they both dance the protocol authentication and identity steps. If all comes out okay, Denise and Bob continue as described above. .Pp It should be clear from the above that Bob can support all the girls at the same time, as long as he has compatible authentication and identity credentials. Now, Bob can act just like the girls in his own choice of servers; he can run multiple configured associations with multiple different servers (or the same server, although that might not be useful). But, wise security policy might preclude some cryptotype combinations; for instance, running an identity scheme with one server and no authentication with another might not be wise. .Ss Key Management The cryptographic values used by the Autokey protocol are incorporated as a set of files generated by the .Xr ntp-keygen 1ntpkeygenmdoc utility program, including symmetric key, host key and public certificate files, as well as sign key, identity parameters and leapseconds files. Alternatively, host and sign keys and certificate files can be generated by the OpenSSL utilities and certificates can be imported from public certificate authorities. Note that symmetric keys are necessary for the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc utility programs. The remaining files are necessary only for the Autokey protocol. .Pp Certificates imported from OpenSSL or public certificate authorities have certian limitations. The certificate should be in ASN.1 syntax, X.509 Version 3 format and encoded in PEM, which is the same format used by OpenSSL. The overall length of the certificate encoded in ASN.1 must not exceed 1024 bytes. The subject distinguished name field (CN) is the fully qualified name of the host on which it is used; the remaining subject fields are ignored. The certificate extension fields must not contain either a subject key identifier or a issuer key identifier field; however, an extended key usage field for a trusted host must contain the value .Cm trustRoot ; . Other extension fields are ignored. .Ss Authentication Commands .Bl -tag -width indent .It Ic autokey Op Ar logsec Specifies the interval between regenerations of the session key list used with the Autokey protocol. Note that the size of the key list for each association depends on this interval and the current poll interval. The default value is 12 (4096 s or about 1.1 hours). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. .It Ic controlkey Ar key Specifies the key identifier to use with the .Xr ntpq 1ntpqmdoc utility, which uses the standard protocol defined in RFC-1305. The .Ar key argument is the key identifier for a trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Xo Ic crypto .Op Cm cert Ar file .Op Cm leap Ar file .Op Cm randfile Ar file .Op Cm host Ar file .Op Cm sign Ar file .Op Cm gq Ar file .Op Cm gqpar Ar file .Op Cm iffpar Ar file .Op Cm mvpar Ar file .Op Cm pw Ar password .Xc This command requires the OpenSSL library. It activates public key cryptography, selects the message digest and signature encryption scheme and loads the required private and public values described above. If one or more files are left unspecified, the default names are used as described above. Unless the complete path and name of the file are specified, the location of a file is relative to the keys directory specified in the .Ic keysdir command or default .Pa /usr/local/etc . Following are the subcommands: .Bl -tag -width indent .It Cm cert Ar file Specifies the location of the required host public certificate file. This overrides the link .Pa ntpkey_cert_ Ns Ar hostname in the keys directory. .It Cm gqpar Ar file Specifies the location of the optional GQ parameters file. This overrides the link .Pa ntpkey_gq_ Ns Ar hostname in the keys directory. .It Cm host Ar file Specifies the location of the required host key file. This overrides the link .Pa ntpkey_key_ Ns Ar hostname in the keys directory. .It Cm iffpar Ar file Specifies the location of the optional IFF parameters file.This overrides the link .Pa ntpkey_iff_ Ns Ar hostname in the keys directory. .It Cm leap Ar file Specifies the location of the optional leapsecond file. This overrides the link .Pa ntpkey_leap in the keys directory. .It Cm mvpar Ar file Specifies the location of the optional MV parameters file. This overrides the link .Pa ntpkey_mv_ Ns Ar hostname in the keys directory. .It Cm pw Ar password Specifies the password to decrypt files containing private keys and identity parameters. This is required only if these files have been encrypted. .It Cm randfile Ar file Specifies the location of the random seed file used by the OpenSSL library. The defaults are described in the main text above. .It Cm sign Ar file Specifies the location of the optional sign key file. This overrides the link .Pa ntpkey_sign_ Ns Ar hostname in the keys directory. If this file is not found, the host key is also the sign key. .El .It Ic keys Ar keyfile Specifies the complete path and location of the MD5 key file containing the keys and key identifiers used by .Xr ntpd 1ntpdmdoc , .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc when operating with symmetric key cryptography. This is the same operation as the .Fl k command line option. .It Ic keysdir Ar path This command specifies the default directory path for cryptographic keys, parameters and certificates. The default is .Pa /usr/local/etc/ . .It Ic requestkey Ar key Specifies the key identifier to use with the .Xr ntpdc 1ntpdcmdoc utility program, which uses a proprietary protocol specific to this implementation of .Xr ntpd 1ntpdmdoc . The .Ar key argument is a key identifier for the trusted key, where the value can be in the range 1 to 65,534, inclusive. .It Ic revoke Ar logsec Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds. These values need to be updated frequently in order to deflect brute-force attacks on the algorithms of the scheme; however, updating some values is a relatively expensive operation. The default interval is 16 (65,536 s or about 18 hours). For poll intervals above the specified interval, the values will be updated for every message sent. .It Ic trustedkey Ar key ... Specifies the key identifiers which are trusted for the purposes of authenticating peers with symmetric key cryptography, as well as keys used by the .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc programs. The authentication procedures require that both the local and remote servers share the same key and key identifier for this purpose, although different keys can be used with different servers. The .Ar key arguments are 32-bit unsigned integers with values from 1 to 65,534. .El .Ss Error Codes The following error codes are reported via the NTP control and monitoring protocol trap mechanism. .Bl -tag -width indent .It 101 .Pq bad field format or length The packet has invalid version, length or format. .It 102 .Pq bad timestamp The packet timestamp is the same or older than the most recent received. This could be due to a replay or a server clock time step. .It 103 .Pq bad filestamp The packet filestamp is the same or older than the most recent received. This could be due to a replay or a key file generation error. .It 104 .Pq bad or missing public key The public key is missing, has incorrect format or is an unsupported type. .It 105 .Pq unsupported digest type The server requires an unsupported digest/signature scheme. .It 106 .Pq mismatched digest types Not used. .It 107 .Pq bad signature length The signature length does not match the current public key. .It 108 .Pq signature not verified The message fails the signature check. It could be bogus or signed by a different private key. .It 109 .Pq certificate not verified The certificate is invalid or signed with the wrong key. .It 110 .Pq certificate not verified The certificate is not yet valid or has expired or the signature could not be verified. .It 111 .Pq bad or missing cookie The cookie is missing, corrupted or bogus. .It 112 .Pq bad or missing leapseconds table The leapseconds table is missing, corrupted or bogus. .It 113 .Pq bad or missing certificate The certificate is missing, corrupted or bogus. .It 114 .Pq bad or missing identity The identity key is missing, corrupt or bogus. .El .Sh Monitoring Support .Xr ntpd 1ntpdmdoc includes a comprehensive monitoring facility suitable for continuous, long term recording of server and client timekeeping performance. See the .Ic statistics command below for a listing and example of each type of statistics currently supported. Statistic files are managed using file generation sets and scripts in the .Pa ./scripts directory of this distribution. Using these facilities and .Ux .Xr cron 8 jobs, the data can be automatically summarized and archived for retrospective analysis. .Ss Monitoring Commands .Bl -tag -width indent .It Ic statistics Ar name ... Enables writing of statistics records. Currently, four kinds of .Ar name statistics are supported. .Bl -tag -width indent .It Cm clockstats Enables recording of clock driver statistics information. Each update received from a clock driver appends a line of the following form to the file generation set named .Cm clockstats : .Bd -literal 49213 525.624 127.127.4.1 93 226 00:08:29.606 D .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the clock address in dotted-quad notation. The final field shows the last timecode received from the clock in decoded ASCII format, where meaningful. In some clock drivers a good deal of additional information can be gathered and displayed as well. See information specific to each clock for further details. .It Cm cryptostats This option requires the OpenSSL cryptographic software library. It enables recording of cryptographic public key protocol information. Each message received by the protocol module appends a line of the following form to the file generation set named .Cm cryptostats : .Bd -literal 49213 525.624 127.127.4.1 message .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next field shows the peer address in dotted-quad notation, The final message field includes the message type and certain ancillary information. See the .Sx Authentication Options section for further information. .It Cm loopstats Enables recording of loop filter statistics information. Each update of the local clock outputs a line of the following form to the file generation set named .Cm loopstats : .Bd -literal 50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next five fields show time offset (seconds), frequency offset (parts per million - PPM), RMS jitter (seconds), Allan deviation (PPM) and clock discipline time constant. .It Cm peerstats Enables recording of peer statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each valid update appends a line of the following form to the current element of a file generation set named .Cm peerstats : .Bd -literal 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the peer address in dotted-quad notation and status, respectively. The status field is encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds. .It Cm rawstats Enables recording of raw-timestamp statistics information. This includes statistics records of all peers of a NTP server and of special signals, where present and configured. Each NTP message received from a peer or clock driver appends a line of the following form to the file generation set named .Cm rawstats : .Bd -literal 50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000 3102453281.58622800031 02453332.540806000 3102453332.541458000 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next two fields show the remote peer or clock address followed by the local address in dotted-quad notation. The final four fields show the originate, receive, transmit and final NTP timestamps in order. The timestamp values are as received and before processing by the various data smoothing and mitigation algorithms. .It Cm sysstats Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named .Cm sysstats : .Bd -literal 50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 .Ed .Pp The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line. .Bl -tag -width indent .It Time since restart Cm 36000 Time in hours since the system was last rebooted. .It Packets received Cm 81965 Total number of packets received. .It Packets processed Cm 0 Number of packets received in response to previous packets sent .It Current version Cm 9546 Number of packets matching the current NTP version. .It Previous version Cm 56 Number of packets matching the previous NTP version. .It Bad version Cm 71793 Number of packets matching neither NTP version. .It Access denied Cm 512 Number of packets denied access for any reason. .It Bad length or format Cm 540 Number of packets with invalid length, format or port number. .It Bad authentication Cm 10 Number of packets not verified as authentic. .It Rate exceeded Cm 147 Number of packets discarded due to rate limitation. .El .It Cm statsdir Ar directory_path Indicates the full path of a directory where statistics files should be created (see below). This keyword allows the (otherwise constant) .Cm filegen filename prefix to be modified for file generation sets, which is useful for handling statistics logs. .It Cm filegen Ar name Xo .Op Cm file Ar filename .Op Cm type Ar typename .Op Cm link | nolink .Op Cm enable | disable .Xc Configures setting of generation file set name. Generation file sets provide a means for handling files that are continuously growing during the lifetime of a server. Server statistics are a typical example for such files. Generation file sets provide access to a set of files used to store the actual data. At any time at most one element of the set is being written to. The type given specifies when and how data will be directed to a new element of the set. This way, information stored in elements of a file set that are currently unused are available for administrational operations without the risk of disturbing the operation of ntpd. (Most important: they can be removed to free space for new data produced.) .Pp Note that this command can be sent from the .Xr ntpdc 1ntpdcmdoc program running at a remote location. .Bl -tag -width indent .It Cm name This is the type of the statistics records, as shown in the .Cm statistics command. .It Cm file Ar filename This is the file name for the statistics records. Filenames of set members are built from three concatenated elements .Ar Cm prefix , .Ar Cm filename and .Ar Cm suffix : .Bl -tag -width indent .It Cm prefix This is a constant filename path. It is not subject to modifications via the .Ar filegen option. It is defined by the server, usually specified as a compile-time constant. It may, however, be configurable for individual file generation sets via other commands. For example, the prefix used with .Ar loopstats and .Ar peerstats generation can be configured using the .Ar statsdir option explained above. .It Cm filename This string is directly concatenated to the prefix mentioned above (no intervening .Ql / ) . This can be modified using the file argument to the .Ar filegen statement. No .Pa .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by .Ar prefix . .It Cm suffix This part is reflects individual elements of a file set. It is generated according to the type of a file set. .El .It Cm type Ar typename A file generation set is characterized by its type. The following types are supported: .Bl -tag -width indent .It Cm none The file set is actually a single plain file. .It Cm pid One element of file set is used per incarnation of a ntpd server. This type does not perform any changes to file set members during runtime, however it provides an easy way of separating files belonging to different .Xr ntpd 1ntpdmdoc server incarnations. The set member filename is built by appending a .Ql \&. to concatenated .Ar prefix and .Ar filename strings, and appending the decimal representation of the process ID of the .Xr ntpd 1ntpdmdoc server process. .It Cm day One file generation set element is created per day. A day is defined as the period between 00:00 and 24:00 UTC. The file set member suffix consists of a .Ql \&. and a day specification in the form .Cm YYYYMMdd . .Cm YYYY is a 4-digit year number (e.g., 1992). .Cm MM is a two digit month number. .Cm dd is a two digit day number. Thus, all information written at 10 December 1992 would end up in a file named .Ar prefix .Ar filename Ns .19921210 . .It Cm week Any file set member contains data related to a certain week of a year. The term week is defined by computing day-of-year modulo 7. Elements of such a file generation set are distinguished by appending the following suffix to the file set filename base: A dot, a 4-digit year number, the letter .Cm W , and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix .No . Ns Ar 1992W1 . .It Cm month One generation file set element is generated per month. The file name suffix consists of a dot, a 4-digit year number, and a 2-digit month. .It Cm year One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number. .It Cm age This type of file generation sets changes to a new element of the file set every 24 hours of server operation. The filename suffix consists of a dot, the letter .Cm a , and an 8-digit number. This number is taken to be the number of seconds the server is running at the start of the corresponding 24-hour period. Information is only written to a file generation by specifying .Cm enable ; output is prevented by specifying .Cm disable . .El .It Cm link | nolink It is convenient to be able to access the current element of a file generation set by a fixed name. This feature is enabled by specifying .Cm link and disabled using .Cm nolink . If link is specified, a hard link from the current file set element to a file without suffix is created. When there is already a file with this name and the number of links of this file is one, it is renamed appending a dot, the letter .Cm C , and the pid of the ntpd server process. When the number of links is greater than one, the file is unlinked. This allows the current file to be accessed by a constant name. .It Cm enable \&| Cm disable Enables or disables the recording function. .El .El .El .Sh Access Control Support The .Xr ntpd 1ntpdmdoc daemon implements a general purpose address/mask based restriction list. The list contains address/match entries sorted first by increasing address values and and then by increasing mask values. A match occurs when the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask and address in the list. The list is searched in order with the last match found defining the restriction flags associated with the entry. Additional information and examples can be found in the .Qq Notes on Configuring NTP and Setting up a NTP Subnet page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp The restriction facility was implemented in conformance with the access policies for the original NSFnet backbone time servers. Later the facility was expanded to deflect cryptographic and clogging attacks. While this facility may be useful for keeping unwanted or broken or malicious clients from congesting innocent servers, it should not be considered an alternative to the NTP authentication facilities. Source address based restrictions are easily circumvented by a determined cracker. .Pp Clients can be denied service because they are explicitly included in the restrict list created by the restrict command or implicitly as the result of cryptographic or rate limit violations. Cryptographic violations include certificate or identity verification failure; rate limit violations generally result from defective NTP implementations that send packets at abusive rates. Some violations cause denied service only for the offending packet, others cause denied service for a timed period and others cause the denied service for an indefinate period. When a client or network is denied access for an indefinate period, the only way at present to remove the restrictions is by restarting the server. .Ss The Kiss-of-Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more proactive response is needed, such as a server message that explicitly requests the client to stop sending and leave a message for the system operator. A special packet format has been created for this purpose called the "kiss-of-death" (KoD) packet. KoD packets have the leap bits set unsynchronized and stratum set to zero and the reference identifier field set to a four-byte ASCII code. If the .Cm noserve or .Cm notrust flag of the matching restrict list entry is set, the code is "DENY"; if the .Cm limited flag is set and the rate limit is exceeded, the code is "RATE". Finally, if a cryptographic violation occurs, the code is "CRYP". .Pp A client receiving a KoD performs a set of sanity checks to minimize security exposure, then updates the stratum and reference identifier peer variables, sets the access denied (TEST4) bit in the peer flash variable and sends a message to the log. As long as the TEST4 bit is set, the client will send no further packets to the server. The only way at present to recover from this condition is to restart the protocol at both the client and server. This happens automatically at the client when the association times out. It will happen at the server only if the server operator cooperates. .Ss Access Control Commands .Bl -tag -width indent .It Xo Ic discard .Op Cm average Ar avg .Op Cm minimum Ar min .Op Cm monitor Ar prob .Xc Set the parameters of the .Cm limited facility which protects the server from client abuse. The .Cm average subcommand specifies the minimum average packet spacing, while the .Cm minimum subcommand specifies the minimum packet spacing. Packets that violate these minima are discarded and a kiss-o'-death packet returned if enabled. The default minimum average and minimum are 5 and 2, respectively. The monitor subcommand specifies the probability of discard for packets that overflow the rate-control window. .It Xo Ic restrict address .Op Cm mask Ar mask .Op Ar flag ... .Xc The .Ar address argument expressed in dotted-quad form is the address of a host or network. Alternatively, the .Ar address argument can be a valid host DNS name. The .Ar mask argument expressed in dotted-quad form defaults to .Cm 255.255.255.255 , meaning that the .Ar address is treated as the address of an individual host. A default entry (address .Cm 0.0.0.0 , mask .Cm 0.0.0.0 ) is always included and is always the first entry in the list. Note that text string .Cm default , with no mask option, may be used to indicate the default entry. In the current implementation, .Cm flag always restricts access, i.e., an entry with no flags indicates that free access to the server is to be given. The flags are not orthogonal, in that more restrictive flags will often make less restrictive ones redundant. The flags can generally be classed into two categories, those which restrict time service and those which restrict informational queries and attempts to do run-time reconfiguration of the server. One or more of the following flags may be specified: .Bl -tag -width indent .It Cm ignore Deny packets of all kinds, including .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm kod If this flag is set when an access violation occurs, a kiss-o'-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped. .It Cm limited Deny service if the packet spacing violates the lower limits specified in the discard command. A history of clients is kept using the monitoring capability of .Xr ntpd 1ntpdmdoc . Thus, monitoring is always active as long as there is a restriction entry with the .Cm limited flag. .It Cm lowpriotrap Declare traps set by matching hosts to be low priority. The number of traps a server can maintain is limited (the current limit is 3). Traps are usually assigned on a first come, first served basis, with later trap requestors being denied service. This flag modifies the assignment algorithm by allowing low priority traps to be overridden by later requests for normal priority traps. .It Cm nomodify Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted. .It Cm noquery Deny .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. Time service is not affected. .It Cm nopeer Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist. .It Cm noserve Deny all packets except .Xr ntpq 1ntpqmdoc and .Xr ntpdc 1ntpdcmdoc queries. .It Cm notrap Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs. .It Cm notrust Deny service unless the packet is cryptographically authenticated. .It Cm ntpport This is actually a match algorithm modifier, rather than a restriction flag. Its presence causes the restriction entry to be matched only if the source port in the packet is the standard NTP UDP port (123). Both .Cm ntpport and .Cm non-ntpport may be specified. The .Cm ntpport is considered more specific and is sorted later in the list. .It Cm version Deny packets that do not match the current NTP version. .El .Pp Default restriction list entries with the flags ignore, interface, ntpport, for each of the local host's interface addresses are inserted into the table at startup to prevent the server from attempting to synchronize to its own time. A default entry is also always present, though if it is otherwise unconfigured; no flags are associated with the default entry (i.e., everything besides your own NTP server is unrestricted). .El .Sh Automatic NTP Configuration Options .Ss Manycasting Manycasting is a automatic discovery and configuration paradigm new to NTPv4. It is intended as a means for a multicast client to troll the nearby network neighborhood to find cooperating manycast servers, validate them using cryptographic means and evaluate their time values with respect to other servers that might be lurking in the vicinity. The intended result is that each manycast client mobilizes client associations with some number of the "best" of the nearby manycast servers, yet automatically reconfigures to sustain this number of servers should one or another fail. .Pp Note that the manycasting paradigm does not coincide with the anycast paradigm described in RFC-1546, which is designed to find a single server from a clique of servers providing the same service. The manycast paradigm is designed to find a plurality of redundant servers satisfying defined optimality criteria. .Pp Manycasting can be used with either symmetric key or public key cryptography. The public key infrastructure (PKI) offers the best protection against compromised keys and is generally considered stronger, at least with relatively large key sizes. It is implemented using the Autokey protocol and the OpenSSL cryptographic library available from .Li http://www.openssl.org/ . The library can also be used with other NTPv4 modes as well and is highly recommended, especially for broadcast modes. .Pp A persistent manycast client association is configured using the manycastclient command, which is similar to the server command but with a multicast (IPv4 class .Cm D or IPv6 prefix .Cm FF ) group address. The IANA has designated IPv4 address 224.1.1.1 and IPv6 address FF05::101 (site local) for NTP. When more servers are needed, it broadcasts manycast client messages to this address at the minimum feasible rate and minimum feasible time-to-live (TTL) hops, depending on how many servers have already been found. There can be as many manycast client associations as different group address, each one serving as a template for a future ephemeral unicast client/server association. .Pp Manycast servers configured with the .Ic manycastserver command listen on the specified group address for manycast client messages. Note the distinction between manycast client, which actively broadcasts messages, and manycast server, which passively responds to them. If a manycast server is in scope of the current TTL and is itself synchronized to a valid source and operating at a stratum level equal to or lower than the manycast client, it replies to the manycast client message with an ordinary unicast server message. .Pp The manycast client receiving this message mobilizes an ephemeral client/server association according to the matching manycast client template, but only if cryptographically authenticated and the server stratum is less than or equal to the client stratum. Authentication is explicitly required and either symmetric key or public key (Autokey) can be used. Then, the client polls the server at its unicast address in burst mode in order to reliably set the host clock and validate the source. This normally results in a volley of eight client/server at 2-s intervals during which both the synchronization and cryptographic protocols run concurrently. Following the volley, the client runs the NTP intersection and clustering algorithms, which act to discard all but the "best" associations according to stratum and synchronization distance. The surviving associations then continue in ordinary client/server mode. .Pp The manycast client polling strategy is designed to reduce as much as possible the volume of manycast client messages and the effects of implosion due to near-simultaneous arrival of manycast server messages. The strategy is determined by the .Ic manycastclient , .Ic tos and .Ic ttl configuration commands. The manycast poll interval is normally eight times the system poll interval, which starts out at the .Cm minpoll value specified in the .Ic manycastclient , command and, under normal circumstances, increments to the .Cm maxpolll value specified in this command. Initially, the TTL is set at the minimum hops specified by the ttl command. At each retransmission the TTL is increased until reaching the maximum hops specified by this command or a sufficient number client associations have been found. Further retransmissions use the same TTL. .Pp The quality and reliability of the suite of associations discovered by the manycast client is determined by the NTP mitigation algorithms and the .Cm minclock and .Cm minsane values specified in the .Ic tos configuration command. At least .Cm minsane candidate servers must be available and the mitigation algorithms produce at least .Cm minclock survivors in order to synchronize the clock. Byzantine agreement principles require at least four candidates in order to correctly discard a single falseticker. For legacy purposes, .Cm minsane defaults to 1 and .Cm minclock defaults to 3. For manycast service .Cm minsane should be explicitly set to 4, assuming at least that number of servers are available. .Pp If at least .Cm minclock servers are found, the manycast poll interval is immediately set to eight times .Cm maxpoll . If less than .Cm minclock servers are found when the TTL has reached the maximum hops, the manycast poll interval is doubled. For each transmission after that, the poll interval is doubled again until reaching the maximum of eight times .Cm maxpoll . Further transmissions use the same poll interval and TTL values. Note that while all this is going on, each client/server association found is operating normally it the system poll interval. .Pp Administratively scoped multicast boundaries are normally specified by the network router configuration and, in the case of IPv6, the link/site scope prefix. By default, the increment for TTL hops is 32 starting from 31; however, the .Ic ttl configuration command can be used to modify the values to match the scope rules. .Pp It is often useful to narrow the range of acceptable servers which can be found by manycast client associations. Because manycast servers respond only when the client stratum is equal to or greater than the server stratum, primary (stratum 1) servers fill find only primary servers in TTL range, which is probably the most common objective. However, unless configured otherwise, all manycast clients in TTL range will eventually find all primary servers in TTL range, which is probably not the most common objective in large networks. The .Ic tos command can be used to modify this behavior. Servers with stratum below .Cm floor or above .Cm ceiling specified in the .Ic tos command are strongly discouraged during the selection process; however, these servers may be temporally accepted if the number of servers within TTL range is less than .Cm minclock . .Pp The above actions occur for each manycast client message, which repeats at the designated poll interval. However, once the ephemeral client association is mobilized, subsequent manycast server replies are discarded, since that would result in a duplicate association. If during a poll interval the number of client associations falls below .Cm minclock , all manycast client prototype associations are reset to the initial poll interval and TTL hops and operation resumes from the beginning. It is important to avoid frequent manycast client messages, since each one requires all manycast servers in TTL range to respond. The result could well be an implosion, either minor or major, depending on the number of servers in range. The recommended value for .Cm maxpoll is 12 (4,096 s). .Pp It is possible and frequently useful to configure a host as both manycast client and manycast server. A number of hosts configured this way and sharing a common group address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. For example, consider an NTP subnet of two primary servers and a hundred or more dependent clients. With two exceptions, all servers and clients have identical configuration files including both .Ic multicastclient and .Ic multicastserver commands using, for instance, multicast group address 239.1.1.1. The only exception is that each primary server configuration file must include commands for the primary reference source such as a GPS receiver. .Pp The remaining configuration files for all secondary servers and clients have the same contents, except for the .Ic tos command, which is specific for each stratum level. For stratum 1 and stratum 2 servers, that command is not necessary. For stratum 3 and above servers the .Cm floor value is set to the intended stratum number. Thus, all stratum 3 configuration files are identical, all stratum 4 files are identical and so forth. .Pp Once operations have stabilized in this scenario, the primary servers will find the primary reference source and each other, since they both operate at the same stratum (1), but not with any secondary server or client, since these operate at a higher stratum. The secondary servers will find the servers at the same stratum level. If one of the primary servers loses its GPS receiver, it will continue to operate as a client and other clients will time out the corresponding association and re-associate accordingly. .Pp Some administrators prefer to avoid running .Xr ntpd 1ntpdmdoc continuously and run either .Xr ntpdate 8 or .Xr ntpd 1ntpdmdoc .Fl q as a cron job. In either case the servers must be configured in advance and the program fails if none are available when the cron job runs. A really slick application of manycast is with .Xr ntpd 1ntpdmdoc .Fl q . The program wakes up, scans the local landscape looking for the usual suspects, selects the best from among the rascals, sets the clock and then departs. Servers do not have to be configured in advance and all clients throughout the network can have the same configuration file. .Ss Manycast Interactions with Autokey Each time a manycast client sends a client mode packet to a multicast group address, all manycast servers in scope generate a reply including the host name and status word. The manycast clients then run the Autokey protocol, which collects and verifies all certificates involved. Following the burst interval all but three survivors are cast off, but the certificates remain in the local cache. It often happens that several complete signing trails from the client to the primary servers are collected in this way. .Pp About once an hour or less often if the poll interval exceeds this, the client regenerates the Autokey key list. This is in general transparent in client/server mode. However, about once per day the server private value used to generate cookies is refreshed along with all manycast client associations. In this case all cryptographic values including certificates is refreshed. If a new certificate has been generated since the last refresh epoch, it will automatically revoke all prior certificates that happen to be in the certificate cache. At the same time, the manycast scheme starts all over from the beginning and the expanding ring shrinks to the minimum and increments from there while collecting all servers in scope. .Ss Manycast Options .Bl -tag -width indent .It Xo Ic tos .Oo .Cm ceiling Ar ceiling | .Cm cohort { 0 | 1 } | .Cm floor Ar floor | .Cm minclock Ar minclock | .Cm minsane Ar minsane .Oc .Xc This command affects the clock selection and clustering algorithms. It can be used to select the quality and quantity of peers used to synchronize the system clock and is most useful in manycast mode. The variables operate as follows: .Bl -tag -width indent .It Cm ceiling Ar ceiling Peers with strata above .Cm ceiling will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 15, but can be changed to any number from 1 to 15. .It Cm cohort Bro 0 | 1 Brc This is a binary flag which enables (0) or disables (1) manycast server replies to manycast clients with the same stratum level. This is useful to reduce implosions where large numbers of clients with the same stratum level are present. The default is to enable these replies. .It Cm floor Ar floor Peers with strata below .Cm floor will be discarded if there are at least .Cm minclock peers remaining. This value defaults to 1, but can be changed to any number from 1 to 15. .It Cm minclock Ar minclock The clustering algorithm repeatedly casts out outlyer associations until no more than .Cm minclock associations remain. This value defaults to 3, but can be changed to any number from 1 to the number of configured sources. .It Cm minsane Ar minsane This is the minimum number of candidates available to the clock selection algorithm in order to produce one or more truechimers for the clustering algorithm. If fewer than this number are available, the clock is undisciplined and allowed to run free. The default is 1 for legacy purposes. However, according to principles of Byzantine agreement, .Cm minsane should be at least 4 in order to detect and discard a single falseticker. .El .It Cm ttl Ar hop ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El .Sh Reference Clock Support The NTP Version 4 daemon supports some three dozen different radio, satellite and modem reference clocks plus a special pseudo-clock used for backup or when no other clock source is available. Detailed descriptions of individual device drivers and options can be found in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Additional information can be found in the pages linked there, including the .Qq Debugging Hints for Reference Clock Drivers and .Qq How To Write a Reference Clock Driver pages (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . In addition, support for a PPS signal is available as described in the .Qq Pulse-per-second (PPS) Signal Interfacing page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . Many drivers support special line discipline/streams modules which can significantly improve the accuracy using the driver. These are described in the .Qq Line Disciplines and Streams Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .Pp A reference clock will generally (though not always) be a radio timecode receiver which is synchronized to a source of standard time such as the services offered by the NRC in Canada and NIST and USNO in the US. The interface between the computer and the timecode receiver is device dependent, but is usually a serial port. A device driver specific to each reference clock must be selected and compiled in the distribution; however, most common radio, satellite and modem clocks are included by default. Note that an attempt to configure a reference clock when the driver has not been compiled or the hardware port has not been appropriately configured results in a scalding remark to the system log file, but is otherwise non hazardous. .Pp For the purposes of configuration, .Xr ntpd 1ntpdmdoc treats reference clocks in a manner analogous to normal NTP peers as much as possible. Reference clocks are identified by a syntactically correct but invalid IP address, in order to distinguish them from normal NTP peers. Reference clock addresses are of the form .Sm off .Li 127.127. Ar t . Ar u , .Sm on where .Ar t is an integer denoting the clock type and .Ar u indicates the unit number in the range 0-3. While it may seem overkill, it is in fact sometimes useful to configure multiple reference clocks of the same type, in which case the unit numbers must be unique. .Pp The .Ic server command is used to configure a reference clock, where the .Ar address argument in that command is the clock address. The .Cm key , .Cm version and .Cm ttl options are not used for reference clock support. The .Cm mode option is added for reference clock support, as described below. The .Cm prefer option can be useful to persuade the server to cherish a reference clock with somewhat more enthusiasm than other reference clocks or peers. Further information on this option can be found in the .Qq Mitigation Rules and the prefer Keyword (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page. The .Cm minpoll and .Cm maxpoll options have meaning only for selected clock drivers. See the individual clock driver document pages for additional information. .Pp The .Ic fudge command is used to provide additional information for individual clock drivers and normally follows immediately after the .Ic server command. The .Ar address argument specifies the clock address. The .Cm refid and .Cm stratum options can be used to override the defaults for the device. There are two optional device-dependent time offsets and four flags that can be included in the .Ic fudge command as well. .Pp The stratum number of a reference clock is by default zero. Since the .Xr ntpd 1ntpdmdoc daemon adds one to the stratum of each peer, a primary server ordinarily displays an external stratum of one. In order to provide engineered backups, it is often useful to specify the reference clock stratum as greater than zero. The .Cm stratum option is used for this purpose. Also, in cases involving both a reference clock and a pulse-per-second (PPS) discipline signal, it is useful to specify the reference clock identifier as other than the default, depending on the driver. The .Cm refid option is used for this purpose. Except where noted, these options apply to all clock drivers. .Ss Reference Clock Commands .Bl -tag -width indent .It Xo Ic server .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm prefer .Op Cm mode Ar int .Op Cm minpoll Ar int .Op Cm maxpoll Ar int .Xc This command can be used to configure reference clocks in special ways. The options are interpreted as follows: .Bl -tag -width indent .It Cm prefer Marks the reference clock as preferred. All other things being equal, this host will be chosen for synchronization among a set of correctly operating hosts. See the .Qq Mitigation Rules and the prefer Keyword page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) for further information. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm minpoll Ar int .It Cm maxpoll Ar int These options specify the minimum and maximum polling interval for reference clock messages, as a power of 2 in seconds For most directly connected reference clocks, both .Cm minpoll and .Cm maxpoll default to 6 (64 s). For modem reference clocks, .Cm minpoll defaults to 10 (17.1 m) and .Cm maxpoll defaults to 14 (4.5 h). The allowable range is 4 (16 s) to 17 (36.4 h) inclusive. .El .It Xo Ic fudge .Sm off .Li 127.127. Ar t . Ar u .Sm on .Op Cm time1 Ar sec .Op Cm time2 Ar sec .Op Cm stratum Ar int .Op Cm refid Ar string .Op Cm mode Ar int .Op Cm flag1 Cm 0 \&| Cm 1 .Op Cm flag2 Cm 0 \&| Cm 1 .Op Cm flag3 Cm 0 \&| Cm 1 .Op Cm flag4 Cm 0 \&| Cm 1 .Xc This command can be used to configure reference clocks in special ways. It must immediately follow the .Ic server command which configures the driver. Note that the same capability is possible at run time using the .Xr ntpdc 1ntpdcmdoc program. The options are interpreted as follows: .Bl -tag -width indent .It Cm time1 Ar sec Specifies a constant to be added to the time offset produced by the driver, a fixed-point decimal number in seconds. This is used as a calibration constant to adjust the nominal time offset of a particular clock to agree with an external standard, such as a precision PPS signal. It also provides a way to correct a systematic error or bias due to serial port or operating system latencies, different cable lengths or receiver internal delay. The specified offset is in addition to the propagation delay provided by other means, such as internal DIPswitches. Where a calibration for an individual system and driver is available, an approximate correction is noted in the driver documentation pages. Note: in order to facilitate calibration when more than one radio clock or PPS signal is supported, a special calibration feature is available. It takes the form of an argument to the .Ic enable command described in .Sx Miscellaneous Options page and operates as described in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm time2 Ar secs Specifies a fixed-point decimal number in seconds, which is interpreted in a driver-dependent way. See the descriptions of specific drivers in the .Qq Reference Clock Drivers page (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) . .It Cm stratum Ar int Specifies the stratum number assigned to the driver, an integer between 0 and 15. This number overrides the default stratum number ordinarily assigned by the driver itself, usually zero. .It Cm refid Ar string Specifies an ASCII string of from one to four characters which defines the reference identifier used by the driver. This string overrides the default identifier ordinarily assigned by the driver itself. .It Cm mode Ar int Specifies a mode number which is interpreted in a device-specific fashion. For instance, it selects a dialing protocol in the ACTS driver and a device subtype in the parse drivers. .It Cm flag1 Cm 0 \&| Cm 1 .It Cm flag2 Cm 0 \&| Cm 1 .It Cm flag3 Cm 0 \&| Cm 1 .It Cm flag4 Cm 0 \&| Cm 1 These four flags are used for customizing the clock driver. The interpretation of these values, and whether they are used at all, is a function of the particular clock driver. However, by convention .Cm flag4 is used to enable recording monitoring data to the .Cm clockstats file configured with the .Ic filegen command. Further information on the .Ic filegen command can be found in .Sx Monitoring Options . .El .El .Sh Miscellaneous Options .Bl -tag -width indent .It Ic broadcastdelay Ar seconds The broadcast and multicast modes require a special calibration to determine the network delay between the local and remote servers. Ordinarily, this is done automatically by the initial protocol exchanges between the client and server. In some cases, the calibration procedure may fail due to network or server access controls, for example. This command specifies the default delay to be used under these circumstances. Typically (for Ethernet), a number between 0.003 and 0.007 seconds is appropriate. The default when this command is not used is 0.004 seconds. .It Ic calldelay Ar delay This option controls the delay in seconds between the first and second packets sent in burst or iburst mode to allow additional time for a modem or ISDN call to complete. .It Ic driftfile Ar driftfile This command specifies the complete path and name of the file used to record the frequency of the local clock oscillator. This is the same operation as the .Fl f command line option. If the file exists, it is read at startup in order to set the initial frequency and then updated once per hour with the current frequency computed by the daemon. If the file name is specified, but the file itself does not exist, the starts with an initial frequency of zero and creates the file when writing it for the first time. If this command is not given, the daemon will always start with an initial frequency of zero. .Pp The file format consists of a single line containing a single floating point number, which records the frequency offset measured in parts-per-million (PPM). The file is updated by first writing the current drift value into a temporary file and then renaming this file to replace the old version. This implies that .Xr ntpd 1ntpdmdoc must have write permission for the directory the drift file is located in, and that file system links, symbolic or otherwise, should be avoided. .It Xo Ic enable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm monitor | Cm ntp | .Cm pps | Cm stats .Oc .Xc .It Xo Ic disable .Oo .Cm auth | Cm bclient | .Cm calibrate | Cm kernel | .Cm monitor | Cm ntp | .Cm pps | Cm stats .Oc .Xc Provides a way to enable or disable various server options. Flags not mentioned are unaffected. Note that all of these flags can be controlled remotely using the .Xr ntpdc 1ntpdcmdoc utility program. .Bl -tag -width indent .It Cm auth Enables the server to synchronize with unconfigured peers only if the peer has been correctly authenticated using either public key or private key cryptography. The default for this flag is .Ic enable . .It Cm bclient Enables the server to listen for a message from a broadcast or multicast server, as in the .Ic multicastclient command with default address. The default for this flag is .Ic disable . .It Cm calibrate Enables the calibrate feature for reference clocks. The default for this flag is .Ic disable . .It Cm kernel Enables the kernel time discipline, if available. The default for this flag is .Ic enable if support is available, otherwise .Ic disable . .It Cm monitor Enables the monitoring facility. See the .Xr ntpdc 1ntpdcmdoc program and the .Ic monlist command or further information. The default for this flag is .Ic enable . .It Cm ntp Enables time and frequency discipline. In effect, this switch opens and closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . .It Cm pps Enables the pulse-per-second (PPS) signal when frequency and time is disciplined by the precision time kernel modifications. See the .Qq A Kernel Model for Precision Timekeeping (available as part of the HTML documentation provided in .Pa /usr/share/doc/ntp ) page for further information. The default for this flag is .Ic disable . .It Cm stats Enables the statistics facility. See the .Sx Monitoring Options section for further information. The default for this flag is .Ic disable . .El .It Ic includefile Ar includefile This command allows additional configuration commands to be included from a separate file. Include files may be nested to a depth of five; upon reaching the end of any include file, command processing resumes in the previous configuration file. This option is useful for sites that run .Xr ntpd 1ntpdmdoc on multiple hosts, with (mostly) common options (e.g., a restriction list). .It Ic logconfig Ar configkeyword This command controls the amount and type of output written to the system .Xr syslog 3 facility or the alternate .Ic logfile log file. By default, all output is turned on. All .Ar configkeyword keywords can be prefixed with .Ql = , .Ql + and .Ql - , where .Ql = sets the .Xr syslog 3 priority mask, .Ql + adds and .Ql - removes messages. .Xr syslog 3 messages can be controlled in four classes .Po .Cm clock , .Cm peer , .Cm sys and .Cm sync .Pc . Within these classes four types of messages can be controlled: informational messages .Po .Cm info .Pc , event messages .Po .Cm events .Pc , statistics messages .Po .Cm statistics .Pc and status messages .Po .Cm status .Pc . .Pp Configuration keywords are formed by concatenating the message class with the event class. The .Cm all prefix can be used instead of a message class. A message class may also be followed by the .Cm all keyword to enable/disable all messages of the respective message class.Thus, a minimal log configuration could look like this: .Bd -literal logconfig =syncstatus +sysevents .Ed .Pp This would just list the synchronizations state of .Xr ntpd 1ntpdmdoc and the major system events. For a simple reference server, the following minimum message configuration could be useful: .Bd -literal logconfig =syncall +clockall .Ed .Pp This configuration will list all clock information and synchronization information. All other events and messages about peers, system events and so on is suppressed. .It Ic logfile Ar logfile This command specifies the location of an alternate log file to be used instead of the default system .Xr syslog 3 facility. This is the same operation as the -l command line option. .It Ic setvar Ar variable Op Cm default This command adds an additional system variable. These variables can be used to distribute additional information such as the access policy. If the variable of the form .Sm off .Va name = Ar value .Sm on is followed by the .Cm default keyword, the variable will be listed as part of the default system variables .Po .Xr ntpq 1ntpqmdoc .Ic rv command .Pc ) . These additional variables serve informational purposes only. They are not related to the protocol other that they can be listed. The known protocol variables will always override any variables defined via the .Ic setvar mechanism. There are three special variables that contain the names of all variable of the same group. The .Va sys_var_list holds the names of all system variables. The .Va peer_var_list holds the names of all peer variables and the .Va clock_var_list holds the names of the reference clock variables. .It Xo Ic tinker .Oo .Cm allan Ar allan | .Cm dispersion Ar dispersion | .Cm freq Ar freq | .Cm huffpuff Ar huffpuff | .Cm panic Ar panic | .Cm step Ar srep | .Cm stepout Ar stepout .Oc .Xc This command can be used to alter several system variables in very exceptional circumstances. It should occur in the configuration file before any other configuration options. The default values of these variables have been carefully optimized for a wide range of network speeds and reliability expectations. In general, they interact in intricate ways that are hard to predict and some combinations can result in some very nasty behavior. Very rarely is it necessary to change the default values; but, some folks cannot resist twisting the knobs anyway and this command is for them. Emphasis added: twisters are on their own and can expect no help from the support group. .Pp The variables operate as follows: .Bl -tag -width indent .It Cm allan Ar allan The argument becomes the new value for the minimum Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm. The value in log2 seconds defaults to 7 (1024 s), which is also the lower limit. .It Cm dispersion Ar dispersion The argument becomes the new value for the dispersion increase rate, normally .000015 s/s. .It Cm freq Ar freq The argument becomes the initial value of the frequency offset in parts-per-million. This overrides the value in the frequency file, if present, and avoids the initial training state if it is not. .It Cm huffpuff Ar huffpuff The argument becomes the new value for the experimental huff-n'-puff filter span, which determines the most recent interval the algorithm will search for a minimum delay. The lower limit is 900 s (15 m), but a more reasonable value is 7200 (2 hours). There is no default, since the filter is not enabled unless this command is given. .It Cm panic Ar panic The argument is the panic threshold, normally 1000 s. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted. .It Cm step Ar step The argument is the step threshold, which by default is 0.128 s. It can be set to any positive number in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than the default. .It Cm stepout Ar stepout The argument is the stepout timeout, which by default is 900 s. It can be set to any positive number in seconds. If set to zero, the stepout pulses will not be suppressed. .El .It Xo Ic rlimit .Oo .Cm memlock Ar Nmegabytes | .Cm stacksize Ar N4kPages .Cm filenum Ar Nfiledescriptors .Oc .Xc .Bl -tag -width indent .It Cm memlock Ar Nmegabytes Specify the number of megabytes of memory that can be allocated. Probably only available under Linux, this option is useful when dropping root (the .Fl i option). The default is 32 megabytes. Setting this to zero will prevent any attemp to lock memory. .It Cm stacksize Ar N4kPages Specifies the maximum size of the process stack on systems with the .It Cm filenum Ar Nfiledescriptors Specifies the maximum number of file descriptors ntpd may have open at once. Defaults to the system default. .Fn mlockall function. Defaults to 50 4k pages (200 4k pages in OpenBSD). .El .It Xo Ic trap Ar host_address .Op Cm port Ar port_number .Op Cm interface Ar interface_address .Xc This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. If the port number is unspecified, a value of 18447 is used. If the interface address is not specified, the message is sent with a source address of the local interface the message is sent through. Note that on a multihomed host the interface used may vary from time to time with routing changes. .Pp The trap receiver will generally log event messages and other information from the server in a log file. While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. .It Cm hop Ar ... This command specifies a list of TTL values in increasing order, up to 8 values can be specified. In manycast mode these values are used in turn in an expanding-ring search. The default is eight multiples of 32 starting at 31. .El _END_PROG_MDOC_DESCRIP; }; doc-section = { ds-type = 'FILES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_FILES .Bl -tag -width /etc/ntp.drift -compact .It Pa /etc/ntp.conf the default name of the configuration file .It Pa ntp.keys private MD5 keys .It Pa ntpkey RSA private key .It Pa ntpkey_ Ns Ar host RSA public key .It Pa ntp_dh Diffie-Hellman agreement parameters .El _END_MDOC_FILES; }; doc-section = { ds-type = 'SEE ALSO'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_SEE_ALSO .Xr ntpd 1ntpdmdoc , .Xr ntpdc 1ntpdcmdoc , .Xr ntpq 1ntpqmdoc .Pp In addition to the manual pages provided, comprehensive documentation is available on the world wide web at .Li http://www.ntp.org/ . A snapshot of this documentation is available in HTML format in .Pa /usr/share/doc/ntp . .Rs .%A David L. Mills .%T Network Time Protocol (Version 4) .%O RFC5905 .Re _END_MDOC_SEE_ALSO; }; doc-section = { ds-type = 'BUGS'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_BUGS The syntax checking is not picky; some combinations of ridiculous and even hilarious options and modes may not be detected. .Pp The .Pa ntpkey_ Ns Ar host files are really digital certificates. These should be obtained via secure directory services when they become universally available. _END_MDOC_BUGS; }; doc-section = { ds-type = 'NOTES'; ds-format = 'mdoc'; ds-text = <<- _END_MDOC_NOTES This document corresponds to version #VERSION# of NTP. This document was derived from FreeBSD. _END_MDOC_NOTES; }; @