Figure 1. Example Configuration
Last update: 01-Oct-2011 16:11 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 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 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patch external/bsd/ntp/dist/lib/isc/heap.c patch external/bsd/ntp/dist/lib/isc/hex.c patch external/bsd/ntp/dist/lib/isc/hmacmd5.c patch external/bsd/ntp/dist/lib/isc/hmacsha.c patch external/bsd/ntp/dist/lib/isc/httpd.c patch external/bsd/ntp/dist/lib/isc/inet_aton.c patch external/bsd/ntp/dist/lib/isc/inet_ntop.c patch external/bsd/ntp/dist/lib/isc/inet_pton.c patch external/bsd/ntp/dist/lib/isc/iterated_hash.c patch external/bsd/ntp/dist/lib/isc/lex.c patch external/bsd/ntp/dist/lib/isc/lfsr.c patch external/bsd/ntp/dist/lib/isc/lib.c patch external/bsd/ntp/dist/lib/isc/log.c patch external/bsd/ntp/dist/lib/isc/md5.c patch external/bsd/ntp/dist/lib/isc/mem.c patch external/bsd/ntp/dist/lib/isc/mem_api.c patch external/bsd/ntp/dist/lib/isc/mutexblock.c patch external/bsd/ntp/dist/lib/isc/netaddr.c patch external/bsd/ntp/dist/lib/isc/netscope.c patch external/bsd/ntp/dist/lib/isc/ondestroy.c patch external/bsd/ntp/dist/lib/isc/parseint.c patch external/bsd/ntp/dist/lib/isc/portset.c patch external/bsd/ntp/dist/lib/isc/print.c patch external/bsd/ntp/dist/lib/isc/quota.c patch external/bsd/ntp/dist/lib/isc/radix.c patch external/bsd/ntp/dist/lib/isc/random.c patch external/bsd/ntp/dist/lib/isc/ratelimiter.c patch external/bsd/ntp/dist/lib/isc/refcount.c patch external/bsd/ntp/dist/lib/isc/region.c patch external/bsd/ntp/dist/lib/isc/result.c patch external/bsd/ntp/dist/lib/isc/rwlock.c patch external/bsd/ntp/dist/lib/isc/serial.c patch external/bsd/ntp/dist/lib/isc/sha1.c patch external/bsd/ntp/dist/lib/isc/sha2.c patch external/bsd/ntp/dist/lib/isc/sockaddr.c patch external/bsd/ntp/dist/lib/isc/socket_api.c patch external/bsd/ntp/dist/lib/isc/stats.c patch external/bsd/ntp/dist/lib/isc/string.c patch external/bsd/ntp/dist/lib/isc/strtoul.c patch external/bsd/ntp/dist/lib/isc/symtab.c patch external/bsd/ntp/dist/lib/isc/task.c patch external/bsd/ntp/dist/lib/isc/task_api.c patch external/bsd/ntp/dist/lib/isc/task_p.h patch external/bsd/ntp/dist/lib/isc/taskpool.c patch external/bsd/ntp/dist/lib/isc/timer.c patch external/bsd/ntp/dist/lib/isc/timer_api.c patch external/bsd/ntp/dist/lib/isc/timer_p.h patch external/bsd/ntp/dist/lib/isc/version.c patch external/bsd/ntp/dist/lib/isc/alpha/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/ia64/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/include/isc/Makefile patch external/bsd/ntp/dist/lib/isc/include/isc/app.h patch external/bsd/ntp/dist/lib/isc/include/isc/assertions.h patch external/bsd/ntp/dist/lib/isc/include/isc/backtrace.h patch external/bsd/ntp/dist/lib/isc/include/isc/base32.h patch external/bsd/ntp/dist/lib/isc/include/isc/base64.h patch external/bsd/ntp/dist/lib/isc/include/isc/bind9.h patch external/bsd/ntp/dist/lib/isc/include/isc/bitstring.h patch external/bsd/ntp/dist/lib/isc/include/isc/boolean.h patch external/bsd/ntp/dist/lib/isc/include/isc/buffer.h patch external/bsd/ntp/dist/lib/isc/include/isc/bufferlist.h patch external/bsd/ntp/dist/lib/isc/include/isc/commandline.h patch external/bsd/ntp/dist/lib/isc/include/isc/entropy.h patch external/bsd/ntp/dist/lib/isc/include/isc/error.h patch external/bsd/ntp/dist/lib/isc/include/isc/event.h patch external/bsd/ntp/dist/lib/isc/include/isc/eventclass.h patch external/bsd/ntp/dist/lib/isc/include/isc/file.h patch external/bsd/ntp/dist/lib/isc/include/isc/formatcheck.h patch external/bsd/ntp/dist/lib/isc/include/isc/fsaccess.h patch external/bsd/ntp/dist/lib/isc/include/isc/hash.h patch external/bsd/ntp/dist/lib/isc/include/isc/heap.h patch external/bsd/ntp/dist/lib/isc/include/isc/hex.h patch external/bsd/ntp/dist/lib/isc/include/isc/hmacmd5.h patch external/bsd/ntp/dist/lib/isc/include/isc/hmacsha.h patch external/bsd/ntp/dist/lib/isc/include/isc/httpd.h patch external/bsd/ntp/dist/lib/isc/include/isc/interfaceiter.h patch external/bsd/ntp/dist/lib/isc/include/isc/ipv6.h patch external/bsd/ntp/dist/lib/isc/include/isc/iterated_hash.h patch external/bsd/ntp/dist/lib/isc/include/isc/lang.h patch external/bsd/ntp/dist/lib/isc/include/isc/lex.h patch external/bsd/ntp/dist/lib/isc/include/isc/lfsr.h patch external/bsd/ntp/dist/lib/isc/include/isc/lib.h patch external/bsd/ntp/dist/lib/isc/include/isc/list.h patch external/bsd/ntp/dist/lib/isc/include/isc/log.h patch external/bsd/ntp/dist/lib/isc/include/isc/magic.h patch external/bsd/ntp/dist/lib/isc/include/isc/md5.h patch external/bsd/ntp/dist/lib/isc/include/isc/mem.h patch external/bsd/ntp/dist/lib/isc/include/isc/msgcat.h patch external/bsd/ntp/dist/lib/isc/include/isc/msgs.h patch external/bsd/ntp/dist/lib/isc/include/isc/mutexblock.h patch external/bsd/ntp/dist/lib/isc/include/isc/namespace.h patch external/bsd/ntp/dist/lib/isc/include/isc/netaddr.h patch external/bsd/ntp/dist/lib/isc/include/isc/netscope.h patch external/bsd/ntp/dist/lib/isc/include/isc/ondestroy.h patch external/bsd/ntp/dist/lib/isc/include/isc/os.h patch external/bsd/ntp/dist/lib/isc/include/isc/parseint.h patch external/bsd/ntp/dist/lib/isc/include/isc/platform.h patch external/bsd/ntp/dist/lib/isc/include/isc/portset.h patch external/bsd/ntp/dist/lib/isc/include/isc/print.h patch external/bsd/ntp/dist/lib/isc/include/isc/queue.h patch external/bsd/ntp/dist/lib/isc/include/isc/quota.h patch external/bsd/ntp/dist/lib/isc/include/isc/radix.h patch external/bsd/ntp/dist/lib/isc/include/isc/random.h patch external/bsd/ntp/dist/lib/isc/include/isc/ratelimiter.h patch external/bsd/ntp/dist/lib/isc/include/isc/refcount.h patch external/bsd/ntp/dist/lib/isc/include/isc/region.h patch external/bsd/ntp/dist/lib/isc/include/isc/resource.h patch external/bsd/ntp/dist/lib/isc/include/isc/result.h patch external/bsd/ntp/dist/lib/isc/include/isc/resultclass.h patch external/bsd/ntp/dist/lib/isc/include/isc/rwlock.h patch external/bsd/ntp/dist/lib/isc/include/isc/serial.h patch external/bsd/ntp/dist/lib/isc/include/isc/sha1.h patch external/bsd/ntp/dist/lib/isc/include/isc/sha2.h patch external/bsd/ntp/dist/lib/isc/include/isc/sockaddr.h patch external/bsd/ntp/dist/lib/isc/include/isc/socket.h patch external/bsd/ntp/dist/lib/isc/include/isc/stats.h patch external/bsd/ntp/dist/lib/isc/include/isc/stdio.h patch external/bsd/ntp/dist/lib/isc/include/isc/stdlib.h patch external/bsd/ntp/dist/lib/isc/include/isc/string.h patch external/bsd/ntp/dist/lib/isc/include/isc/symtab.h patch external/bsd/ntp/dist/lib/isc/include/isc/task.h patch external/bsd/ntp/dist/lib/isc/include/isc/taskpool.h patch external/bsd/ntp/dist/lib/isc/include/isc/timer.h patch external/bsd/ntp/dist/lib/isc/include/isc/types.h patch external/bsd/ntp/dist/lib/isc/include/isc/util.h patch external/bsd/ntp/dist/lib/isc/include/isc/version.h patch external/bsd/ntp/dist/lib/isc/include/isc/xml.h patch external/bsd/ntp/dist/lib/isc/mips/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/nls/msgcat.c patch external/bsd/ntp/dist/lib/isc/noatomic/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/nothreads/condition.c patch external/bsd/ntp/dist/lib/isc/nothreads/mutex.c patch external/bsd/ntp/dist/lib/isc/nothreads/thread.c patch external/bsd/ntp/dist/lib/isc/nothreads/include/isc/condition.h patch external/bsd/ntp/dist/lib/isc/nothreads/include/isc/mutex.h patch external/bsd/ntp/dist/lib/isc/nothreads/include/isc/once.h patch external/bsd/ntp/dist/lib/isc/nothreads/include/isc/thread.h patch external/bsd/ntp/dist/lib/isc/powerpc/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/pthreads/condition.c patch external/bsd/ntp/dist/lib/isc/pthreads/mutex.c patch external/bsd/ntp/dist/lib/isc/pthreads/thread.c patch external/bsd/ntp/dist/lib/isc/pthreads/include/isc/condition.h patch external/bsd/ntp/dist/lib/isc/pthreads/include/isc/mutex.h patch external/bsd/ntp/dist/lib/isc/pthreads/include/isc/once.h patch external/bsd/ntp/dist/lib/isc/pthreads/include/isc/thread.h patch external/bsd/ntp/dist/lib/isc/sparc64/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/tests/hash_test.c patch external/bsd/ntp/dist/lib/isc/tests/isctest.c patch external/bsd/ntp/dist/lib/isc/tests/isctest.h patch external/bsd/ntp/dist/lib/isc/tests/queue_test.c patch external/bsd/ntp/dist/lib/isc/tests/socket_test.c patch external/bsd/ntp/dist/lib/isc/tests/symtab_test.c patch external/bsd/ntp/dist/lib/isc/tests/task_test.c patch external/bsd/ntp/dist/lib/isc/tests/taskpool_test.c patch external/bsd/ntp/dist/lib/isc/unix/app.c patch external/bsd/ntp/dist/lib/isc/unix/dir.c patch external/bsd/ntp/dist/lib/isc/unix/entropy.c patch external/bsd/ntp/dist/lib/isc/unix/errno2result.c patch external/bsd/ntp/dist/lib/isc/unix/errno2result.h patch external/bsd/ntp/dist/lib/isc/unix/file.c patch external/bsd/ntp/dist/lib/isc/unix/fsaccess.c patch external/bsd/ntp/dist/lib/isc/unix/ifiter_getifaddrs.c patch external/bsd/ntp/dist/lib/isc/unix/ifiter_ioctl.c patch external/bsd/ntp/dist/lib/isc/unix/ifiter_sysctl.c patch external/bsd/ntp/dist/lib/isc/unix/interfaceiter.c patch external/bsd/ntp/dist/lib/isc/unix/ipv6.c patch external/bsd/ntp/dist/lib/isc/unix/keyboard.c patch external/bsd/ntp/dist/lib/isc/unix/net.c patch external/bsd/ntp/dist/lib/isc/unix/os.c patch external/bsd/ntp/dist/lib/isc/unix/resource.c patch external/bsd/ntp/dist/lib/isc/unix/socket.c patch external/bsd/ntp/dist/lib/isc/unix/socket_p.h patch external/bsd/ntp/dist/lib/isc/unix/stdio.c patch external/bsd/ntp/dist/lib/isc/unix/stdtime.c patch external/bsd/ntp/dist/lib/isc/unix/strerror.c patch external/bsd/ntp/dist/lib/isc/unix/syslog.c patch external/bsd/ntp/dist/lib/isc/unix/time.c patch external/bsd/ntp/dist/lib/isc/unix/include/isc/Makefile patch external/bsd/ntp/dist/lib/isc/unix/include/isc/dir.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/int.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/keyboard.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/net.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/netdb.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/offset.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/stat.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/stdtime.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/strerror.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/syslog.h patch external/bsd/ntp/dist/lib/isc/unix/include/isc/time.h patch external/bsd/ntp/dist/lib/isc/win32/DLLMain.c patch external/bsd/ntp/dist/lib/isc/win32/app.c patch external/bsd/ntp/dist/lib/isc/win32/condition.c patch external/bsd/ntp/dist/lib/isc/win32/dir.c patch external/bsd/ntp/dist/lib/isc/win32/entropy.c patch external/bsd/ntp/dist/lib/isc/win32/errno2result.c patch external/bsd/ntp/dist/lib/isc/win32/errno2result.h patch external/bsd/ntp/dist/lib/isc/win32/file.c patch external/bsd/ntp/dist/lib/isc/win32/fsaccess.c patch external/bsd/ntp/dist/lib/isc/win32/interfaceiter.c patch external/bsd/ntp/dist/lib/isc/win32/ipv6.c patch external/bsd/ntp/dist/lib/isc/win32/keyboard.c patch external/bsd/ntp/dist/lib/isc/win32/libgen.h patch external/bsd/ntp/dist/lib/isc/win32/net.c patch external/bsd/ntp/dist/lib/isc/win32/netdb.h patch external/bsd/ntp/dist/lib/isc/win32/ntgroups.c patch external/bsd/ntp/dist/lib/isc/win32/ntpaths.c patch external/bsd/ntp/dist/lib/isc/win32/once.c patch external/bsd/ntp/dist/lib/isc/win32/os.c patch external/bsd/ntp/dist/lib/isc/win32/resource.c patch external/bsd/ntp/dist/lib/isc/win32/socket.c patch external/bsd/ntp/dist/lib/isc/win32/stdio.c patch external/bsd/ntp/dist/lib/isc/win32/stdtime.c patch external/bsd/ntp/dist/lib/isc/win32/strerror.c patch external/bsd/ntp/dist/lib/isc/win32/syslog.c patch external/bsd/ntp/dist/lib/isc/win32/syslog.h patch external/bsd/ntp/dist/lib/isc/win32/thread.c patch external/bsd/ntp/dist/lib/isc/win32/time.c patch external/bsd/ntp/dist/lib/isc/win32/unistd.h patch external/bsd/ntp/dist/lib/isc/win32/version.c patch external/bsd/ntp/dist/lib/isc/win32/win32os.c patch external/bsd/ntp/dist/lib/isc/win32/include/isc/bind_registry.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/bindevt.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/condition.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/dir.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/int.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/ipv6.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/keyboard.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/mutex.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/net.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/netdb.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/ntgroups.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/ntpaths.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/offset.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/once.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/platform.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/stat.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/stdtime.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/strerror.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/syslog.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/thread.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/time.h patch external/bsd/ntp/dist/lib/isc/win32/include/isc/win32os.h patch external/bsd/ntp/dist/lib/isc/x86_32/include/isc/atomic.h patch external/bsd/ntp/dist/lib/isc/x86_64/include/isc/atomic.h patch external/bsd/ntp/dist/libjsmn/LICENSE patch external/bsd/ntp/dist/libjsmn/Makefile patch external/bsd/ntp/dist/libjsmn/README.md patch external/bsd/ntp/dist/libjsmn/jsmn.c patch external/bsd/ntp/dist/libjsmn/jsmn.h patch external/bsd/ntp/dist/libjsmn/jsmn_test.c patch external/bsd/ntp/dist/libntp/Makefile.am patch external/bsd/ntp/dist/libntp/Makefile.in patch external/bsd/ntp/dist/libntp/a_md5encrypt.c patch external/bsd/ntp/dist/libntp/adjtime.c patch external/bsd/ntp/dist/libntp/adjtimex.c patch external/bsd/ntp/dist/libntp/atoint.c patch external/bsd/ntp/dist/libntp/atolfp.c patch external/bsd/ntp/dist/libntp/atouint.c patch external/bsd/ntp/dist/libntp/audio.c patch external/bsd/ntp/dist/libntp/authkeys.c patch external/bsd/ntp/dist/libntp/authreadkeys.c patch external/bsd/ntp/dist/libntp/authusekey.c patch external/bsd/ntp/dist/libntp/bsd_strerror.c patch external/bsd/ntp/dist/libntp/buftvtots.c patch external/bsd/ntp/dist/libntp/caljulian.c patch external/bsd/ntp/dist/libntp/caltontp.c patch external/bsd/ntp/dist/libntp/calyearstart.c patch external/bsd/ntp/dist/libntp/clocktime.c patch external/bsd/ntp/dist/libntp/clocktypes.c patch external/bsd/ntp/dist/libntp/decodenetnum.c patch external/bsd/ntp/dist/libntp/dofptoa.c patch external/bsd/ntp/dist/libntp/dolfptoa.c patch external/bsd/ntp/dist/libntp/emalloc.c patch external/bsd/ntp/dist/libntp/findconfig.c patch external/bsd/ntp/dist/libntp/getopt.c patch external/bsd/ntp/dist/libntp/hextoint.c patch external/bsd/ntp/dist/libntp/hextolfp.c patch external/bsd/ntp/dist/libntp/humandate.c patch external/bsd/ntp/dist/libntp/icom.c patch external/bsd/ntp/dist/libntp/iosignal.c patch external/bsd/ntp/dist/libntp/lib_strbuf.c patch external/bsd/ntp/dist/libntp/machines.c patch external/bsd/ntp/dist/libntp/mktime.c patch external/bsd/ntp/dist/libntp/modetoa.c patch external/bsd/ntp/dist/libntp/mstolfp.c patch external/bsd/ntp/dist/libntp/msyslog.c patch external/bsd/ntp/dist/libntp/netof.c patch external/bsd/ntp/dist/libntp/ntp_calendar.c patch external/bsd/ntp/dist/libntp/ntp_crypto_rnd.c patch external/bsd/ntp/dist/libntp/ntp_intres.c patch external/bsd/ntp/dist/libntp/ntp_libopts.c patch external/bsd/ntp/dist/libntp/ntp_lineedit.c patch external/bsd/ntp/dist/libntp/ntp_random.c patch external/bsd/ntp/dist/libntp/ntp_rfc2553.c patch external/bsd/ntp/dist/libntp/ntp_worker.c patch external/bsd/ntp/dist/libntp/numtoa.c patch external/bsd/ntp/dist/libntp/numtohost.c patch external/bsd/ntp/dist/libntp/octtoint.c patch external/bsd/ntp/dist/libntp/prettydate.c patch external/bsd/ntp/dist/libntp/recvbuff.c patch external/bsd/ntp/dist/libntp/refnumtoa.c patch external/bsd/ntp/dist/libntp/snprintf.c patch external/bsd/ntp/dist/libntp/socket.c patch external/bsd/ntp/dist/libntp/socktoa.c patch external/bsd/ntp/dist/libntp/socktohost.c patch external/bsd/ntp/dist/libntp/ssl_init.c patch external/bsd/ntp/dist/libntp/statestr.c patch external/bsd/ntp/dist/libntp/strdup.c patch external/bsd/ntp/dist/libntp/strl_obsd.c patch external/bsd/ntp/dist/libntp/syssignal.c patch external/bsd/ntp/dist/libntp/systime.c patch external/bsd/ntp/dist/libntp/systime_s.c patch external/bsd/ntp/dist/libntp/timetoa.c patch 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patch external/bsd/ntp/dist/sntp/libevent/util-internal.h patch external/bsd/ntp/dist/sntp/libevent/whatsnew-2.1.txt patch external/bsd/ntp/dist/sntp/libevent/win32select.c patch external/bsd/ntp/dist/sntp/libevent/WIN32-Code/evconfig-private.h patch external/bsd/ntp/dist/sntp/libevent/WIN32-Code/tree.h patch external/bsd/ntp/dist/sntp/libevent/WIN32-Code/event2/event-config.h patch external/bsd/ntp/dist/sntp/libevent/WIN32-Code/nmake/evconfig-private.h patch external/bsd/ntp/dist/sntp/libevent/WIN32-Code/nmake/event2/event-config.h patch external/bsd/ntp/dist/sntp/libevent/compat/sys/queue.h patch external/bsd/ntp/dist/sntp/libevent/include/Makefile.in patch external/bsd/ntp/dist/sntp/libevent/include/evdns.h patch external/bsd/ntp/dist/sntp/libevent/include/event.h patch external/bsd/ntp/dist/sntp/libevent/include/evhttp.h patch external/bsd/ntp/dist/sntp/libevent/include/evrpc.h patch external/bsd/ntp/dist/sntp/libevent/include/evutil.h patch 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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 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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 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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 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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 @d19 1 a19 1 3-Oct-2011 21:51 @ 1.1.1.2 log @Import ntp 4.2.8 @ text @d19 1 a19 1 3-Oct-2011 21:51 @ 1.1.1.2.12.1 log @file autokey.html was added on branch netbsd-5-1 on 2015-01-07 12:13:14 +0000 @ text @d1 215 @ 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 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external/bsd/ntp/dist/kernel/sys/README new external/bsd/ntp/dist/kernel/sys/bsd_audioirig.h new external/bsd/ntp/dist/kernel/sys/i8253.h new external/bsd/ntp/dist/kernel/sys/parsestreams.h new external/bsd/ntp/dist/kernel/sys/pcl720.h new external/bsd/ntp/dist/kernel/sys/ppsclock.h new external/bsd/ntp/dist/kernel/sys/timex.h new external/bsd/ntp/dist/kernel/sys/tpro.h new external/bsd/ntp/dist/kernel/sys/tt560_api.h new external/bsd/ntp/dist/lib/isc/Atffile new external/bsd/ntp/dist/lib/isc/api new external/bsd/ntp/dist/lib/isc/app_api.c new external/bsd/ntp/dist/lib/isc/assertions.c new external/bsd/ntp/dist/lib/isc/backtrace-emptytbl.c new external/bsd/ntp/dist/lib/isc/backtrace.c new external/bsd/ntp/dist/lib/isc/base32.c new external/bsd/ntp/dist/lib/isc/base64.c new external/bsd/ntp/dist/lib/isc/bitstring.c new external/bsd/ntp/dist/lib/isc/buffer.c new external/bsd/ntp/dist/lib/isc/bufferlist.c new external/bsd/ntp/dist/lib/isc/commandline.c new external/bsd/ntp/dist/lib/isc/entropy.c new external/bsd/ntp/dist/lib/isc/error.c new external/bsd/ntp/dist/lib/isc/event.c new external/bsd/ntp/dist/lib/isc/fsaccess.c new external/bsd/ntp/dist/lib/isc/hash.c new external/bsd/ntp/dist/lib/isc/heap.c new external/bsd/ntp/dist/lib/isc/hex.c new external/bsd/ntp/dist/lib/isc/hmacmd5.c new external/bsd/ntp/dist/lib/isc/hmacsha.c new external/bsd/ntp/dist/lib/isc/httpd.c new external/bsd/ntp/dist/lib/isc/inet_aton.c new external/bsd/ntp/dist/lib/isc/inet_ntop.c new external/bsd/ntp/dist/lib/isc/inet_pton.c new external/bsd/ntp/dist/lib/isc/iterated_hash.c new external/bsd/ntp/dist/lib/isc/lex.c new external/bsd/ntp/dist/lib/isc/lfsr.c new external/bsd/ntp/dist/lib/isc/lib.c new external/bsd/ntp/dist/lib/isc/log.c new external/bsd/ntp/dist/lib/isc/md5.c new external/bsd/ntp/dist/lib/isc/mem.c new external/bsd/ntp/dist/lib/isc/mem_api.c new 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 external/bsd/ntp/dist/lib/isc/strtoul.c new external/bsd/ntp/dist/lib/isc/symtab.c new external/bsd/ntp/dist/lib/isc/task.c new external/bsd/ntp/dist/lib/isc/task_api.c new external/bsd/ntp/dist/lib/isc/task_p.h new external/bsd/ntp/dist/lib/isc/taskpool.c new external/bsd/ntp/dist/lib/isc/timer.c new external/bsd/ntp/dist/lib/isc/timer_api.c new external/bsd/ntp/dist/lib/isc/timer_p.h new external/bsd/ntp/dist/lib/isc/version.c new external/bsd/ntp/dist/lib/isc/alpha/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/ia64/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/include/isc/app.h new external/bsd/ntp/dist/lib/isc/include/isc/assertions.h new external/bsd/ntp/dist/lib/isc/include/isc/backtrace.h new external/bsd/ntp/dist/lib/isc/include/isc/base32.h new external/bsd/ntp/dist/lib/isc/include/isc/base64.h new external/bsd/ntp/dist/lib/isc/include/isc/bind9.h new external/bsd/ntp/dist/lib/isc/include/isc/bitstring.h new external/bsd/ntp/dist/lib/isc/include/isc/boolean.h 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 external/bsd/ntp/dist/lib/isc/pthreads/include/isc/thread.h new external/bsd/ntp/dist/lib/isc/sparc64/include/isc/atomic.h new external/bsd/ntp/dist/lib/isc/tests/Atffile new external/bsd/ntp/dist/lib/isc/tests/hash_test.c new external/bsd/ntp/dist/lib/isc/tests/isctest.c new external/bsd/ntp/dist/lib/isc/tests/isctest.h new external/bsd/ntp/dist/lib/isc/tests/queue_test.c new external/bsd/ntp/dist/lib/isc/tests/socket_test.c new external/bsd/ntp/dist/lib/isc/tests/symtab_test.c new external/bsd/ntp/dist/lib/isc/tests/task_test.c new external/bsd/ntp/dist/lib/isc/tests/taskpool_test.c new external/bsd/ntp/dist/lib/isc/unix/app.c new external/bsd/ntp/dist/lib/isc/unix/dir.c new external/bsd/ntp/dist/lib/isc/unix/entropy.c new external/bsd/ntp/dist/lib/isc/unix/errno2result.c new external/bsd/ntp/dist/lib/isc/unix/errno2result.h new external/bsd/ntp/dist/lib/isc/unix/file.c new external/bsd/ntp/dist/lib/isc/unix/fsaccess.c new external/bsd/ntp/dist/lib/isc/unix/ifiter_getifaddrs.c new 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 external/bsd/ntp/dist/lib/isc/unix/include/isc/netdb.h new external/bsd/ntp/dist/lib/isc/unix/include/isc/offset.h new external/bsd/ntp/dist/lib/isc/unix/include/isc/stat.h new external/bsd/ntp/dist/lib/isc/unix/include/isc/stdtime.h new 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external/bsd/ntp/dist/lib/isc/win32/libisc.mak new external/bsd/ntp/dist/lib/isc/win32/net.c new external/bsd/ntp/dist/lib/isc/win32/netdb.h new external/bsd/ntp/dist/lib/isc/win32/ntgroups.c new external/bsd/ntp/dist/lib/isc/win32/ntpaths.c new external/bsd/ntp/dist/lib/isc/win32/once.c new external/bsd/ntp/dist/lib/isc/win32/os.c new external/bsd/ntp/dist/lib/isc/win32/resource.c new external/bsd/ntp/dist/lib/isc/win32/socket.c new external/bsd/ntp/dist/lib/isc/win32/stdio.c new external/bsd/ntp/dist/lib/isc/win32/stdtime.c new external/bsd/ntp/dist/lib/isc/win32/strerror.c new external/bsd/ntp/dist/lib/isc/win32/syslog.c new external/bsd/ntp/dist/lib/isc/win32/syslog.h new external/bsd/ntp/dist/lib/isc/win32/thread.c new 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 external/bsd/ntp/dist/libntp/Makefile.in new external/bsd/ntp/dist/libntp/README new external/bsd/ntp/dist/libntp/a_md5encrypt.c new external/bsd/ntp/dist/libntp/adjtime.c new external/bsd/ntp/dist/libntp/adjtimex.c new external/bsd/ntp/dist/libntp/atoint.c new external/bsd/ntp/dist/libntp/atolfp.c new external/bsd/ntp/dist/libntp/atouint.c new external/bsd/ntp/dist/libntp/audio.c new external/bsd/ntp/dist/libntp/authkeys.c new external/bsd/ntp/dist/libntp/authreadkeys.c new external/bsd/ntp/dist/libntp/authusekey.c new external/bsd/ntp/dist/libntp/bsd_strerror.c new external/bsd/ntp/dist/libntp/buftvtots.c new external/bsd/ntp/dist/libntp/caljulian.c new external/bsd/ntp/dist/libntp/caltontp.c new external/bsd/ntp/dist/libntp/calyearstart.c new external/bsd/ntp/dist/libntp/clocktime.c new external/bsd/ntp/dist/libntp/clocktypes.c new external/bsd/ntp/dist/libntp/decodenetnum.c new external/bsd/ntp/dist/libntp/dofptoa.c new external/bsd/ntp/dist/libntp/dolfptoa.c new external/bsd/ntp/dist/libntp/emalloc.c new external/bsd/ntp/dist/libntp/findconfig.c new external/bsd/ntp/dist/libntp/getopt.c new external/bsd/ntp/dist/libntp/hextoint.c new external/bsd/ntp/dist/libntp/hextolfp.c new external/bsd/ntp/dist/libntp/humandate.c new 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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 215
Last update: 3-Oct-2011 21:51 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.2.10.1 log @file autokey.html was added on branch netbsd-5-2 on 2015-01-07 10:10:04 +0000 @ text @d1 215 @ 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 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 delete dist/ntp/depcomp delete dist/ntp/dot.emacs delete 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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 215
Last update: 3-Oct-2011 21:51 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.2.8.1 log @file autokey.html was added on branch netbsd-5 on 2015-01-07 04:45:22 +0000 @ text @d1 215 @ 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 external/bsd/ntp/bin/ntpdate/Makefile new external/bsd/ntp/bin/ntpdate/ntpdate.8 new external/bsd/ntp/bin/ntpdc/Makefile new external/bsd/ntp/bin/ntpdc/ntpdc.8 new external/bsd/ntp/bin/ntpq/Makefile new external/bsd/ntp/bin/ntpq/ntpq.8 new 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new external/bsd/ntp/dist/lib/isc/win32/stdio.c new external/bsd/ntp/dist/lib/isc/win32/stdtime.c new external/bsd/ntp/dist/lib/isc/win32/strerror.c new external/bsd/ntp/dist/lib/isc/win32/syslog.c new external/bsd/ntp/dist/lib/isc/win32/syslog.h new external/bsd/ntp/dist/lib/isc/win32/thread.c new 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 external/bsd/ntp/dist/libntp/Makefile.in new external/bsd/ntp/dist/libntp/README new external/bsd/ntp/dist/libntp/a_md5encrypt.c new external/bsd/ntp/dist/libntp/adjtime.c new external/bsd/ntp/dist/libntp/adjtimex.c new external/bsd/ntp/dist/libntp/atoint.c new external/bsd/ntp/dist/libntp/atolfp.c new external/bsd/ntp/dist/libntp/atouint.c new external/bsd/ntp/dist/libntp/audio.c new external/bsd/ntp/dist/libntp/authkeys.c new external/bsd/ntp/dist/libntp/authreadkeys.c new external/bsd/ntp/dist/libntp/authusekey.c new external/bsd/ntp/dist/libntp/bsd_strerror.c new external/bsd/ntp/dist/libntp/buftvtots.c new external/bsd/ntp/dist/libntp/caljulian.c new 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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 215
Last update: 3-Oct-2011 21:51 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.2.6.1 log @file autokey.html was added on branch netbsd-6 on 2014-12-25 02:34:31 +0000 @ text @d1 215 @ 1.1.1.2.6.2 log @Apply patch (requested by christos in ticket #1221): Update ntp to 4.2.8. @ text @a0 215
Last update: 3-Oct-2011 21:51 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.2.4.1 log @file autokey.html was added on branch netbsd-6-0 on 2014-12-25 02:28:02 +0000 @ text @d1 215 @ 1.1.1.2.4.2 log @Apply patch (requested by christos in ticket #1221): Update ntp to 4.2.8. @ text @a0 215
Last update: 3-Oct-2011 21:51 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.2.2.1 log @file autokey.html was added on branch netbsd-6-1 on 2014-12-25 02:13:00 +0000 @ text @d1 215 @ 1.1.1.2.2.2 log @Apply patch (requested by christos in ticket #1221): Update ntp to 4.2.8. @ text @a0 215
Last update: 3-Oct-2011 21:51 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.1.8.1 log @file autokey.html was added on branch tls-maxphys on 2014-08-19 23:51:37 +0000 @ text @d1 215 @ 1.1.1.1.8.2 log @Rebase to HEAD as of a few days ago. @ text @a0 215
Last update: 01-Oct-2011 16:11 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@ 1.1.1.1.4.1 log @file autokey.html was added on branch yamt-pagecache on 2014-05-22 15:50:04 +0000 @ text @d1 215 @ 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 215
Last update: 01-Oct-2011 16:11 UTC
This distribution includes support for the Autokey public key algorithms and protocol specified in RFC-5906 "Network Time Protocol Version 4: Autokey Specification". This support is available only if the OpenSSL library has been installed and the --enable-autokey option is specified when the distribution is built.
Public key cryptography is generally considered more secure than symmetric key cryptography. Symmetric key cryptography is based on a shared secret key which must be distributed by secure means to all participants. Public key cryptography is based on a private secret key known only to the originator and a public key known to all participants. A recipient can verify the originator has the correct private key using the public key and any of several digital signature algorithms.
The Autokey Version 2 protocol described on the Autokey Protocol page verifies packet integrity using message digest algorithms, such as MD5 or SHA, and verifies the source using digital signature schemes, such as RSA or DSA. As used in Autokey, message digests are exceptionally difficult to cryptanalyze, as the keys are used only once.
Optional identity schemes described on the Autokey Identity Schemes page are based on cryptographic challenge/response exchanges. Optional identity schemes provide strong security against masquerade and most forms of clogging attacks. These schemes are exceptionally difficult to cryptanalyze, as the challenge/response exchange data are used only once. They are described along with an executive summary, current status, briefing slides and reading list on the Autonomous Authentication page.
Autokey authenticates individual packets using cookies bound to the IP source and destination addresses. The cookies must have the same IP addresses 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 and clients are operated outside firewall perimeters.
Autokey is designed to authenticate servers to clients, not the other way around as in SSH. An Autokey server can support an authentication scheme such as the Trusted Certificate (TC) scheme described in RFC 5906, while a client is free to choose between the various options. It is important to understand that these provisions are optional and that selection of which option is at the discretion of the client. If the client does not require authentication, it is free to ignore it, even if some other client of the same server elects to participate in either symmetric key or public key cryptography.
Autokey uses industry standard X.509 public certificates, which can be produced by commercial services, utility programs in the OpenSSL software library, and the ntp-keygen utility program in the NTP software distribution. A certificate includes the subject name of the client, the issuer name of the server, the public key of the client and the time period over which the the public and private keys are valid. All Autokey hosts have a self-signed certificate with the Autokey name as both the subject and issuer. During the protocol, additional certificates are produced with the Autokey host name as subject and the host that signs the certificate as issuer.
There are two timeouts associated with the Autokey scheme. The key list timeout is set by the automax command, which specifies the interval between generating new key lists by the client or server. The default timeout of about 1.1 hr is appropriate for the majority of configurations and ordinarily should not be changed. The revoke timeout is set by the revoke command, which specifies the interval between generating new server private values. It is intended to reduce the vulnerability to cryptanalysis; however, new values require the server to encrypt each client cookie separately. The default timeout of about 36 hr is appropriate for most servers, but might be too short for national time servers.
An Autokey subnet consists of a collection of hosts configured as an acyclic, directed tree with roots one or more trusted hosts (THs) operating at the lowest stratum of the subnet. Note that the requirement that the NTP subnet be acyclic means that, if two hosts are configured with each other in symmetric modes, each must be a TH. The THs are synchronized directly or indirectly to national time services via trusted means, such as radio, satellite or telephone modem, or one or more trusted agents (TAs) of a parent subnet. NTP subnets can be nested, with the THs of a child subnet configured for one or more TAs of a parent subnet. The TAs can serve one or more child subnets, each with its own security policy and set of THs.
A certificate trail is a sequence of certificates, each signed by a host one step closer to the THs and terminating at the self-signed certificate of a TH. The requirement that the subnet be acyclic means certificate trails can never loop. NTP servers operate as certificate authorities (CAs) to sign certificates provided by their clients. The CAs include the TAs of the parent subnet and those subnet servers with dependent clients.
In order for the signature to succeed, the client certificate valid period must begin within the valid period of the server certificate. If the server period begins later than the client period, the client certificate has expired; if the client period begins later than the server period, the server certificate has expired.
The Autokey protocol runs for each association separately, During the protocol, the client recursively obtains the certificates on the trail to a TH, saving each in a cache ordered from most recent to oldest. If an expired certificate is found, it is invalidated and marked for later replacement. As the client certificate itself is not involved in the certificate trail, it can only be declared valid or expired when the server signs it.
The certificates derived from each association are combined in the cache with duplicates suppressed. If it happens that two different associations contribute certificates to the cache, a certificate on the trail from one association could expire before any on another trail. In this case the remaining trails will survive until the expired certificate is replaced. Once saved in the cache, a certificate remains valid until it expires or is replaced by a new one.
It is important to note that the certificate trail is validated only at startup when an association is mobilized. Once validated in this way, the server remains valid until it is demobilized, even if certificates on the trail to the THs expire. While the certificate trail authenticates each host on the trail to the THs, it does not validate the time values themselves. Ultimately, this is determined by the NTP on-wire protocol.
Example
Figure 1. Example Configuration
Figure 1 shows an example configuration with three NTP subnets, Alice, Helen and Carol. Alice and Helen are parent groups for Carol with TA C belonging to Alice and TA S belonging to Helen. Hosts A and B are THs of Alice, host R is the TH of Helen and host X is the TH of Carol. Assume that all associations are client/server, child subnet TH X has two mobilized associations, one to Alice TA host C and the other to Carol TA host S. While not shown in the figure, Alice hosts A and B could configure symmetric mode associations between them for redundancy and backup.
Note that host D certificate trail is D→C→A or D→C→B, depending on the particular order the trails are built. Host Y certificate trail is only Y→X, since X is a TH. Host X has two certificate trails X→C→A or X→C→B, and X→S→R.
In some configurations where more than one subnet shares an Ethernet or when multiple subnets exist in a manycast or pool configuration, it is useful to isolate one subnet from another. In Autokey this can be done using group names. An Autokey host name is specified by the -s host@@group option of the ntp-keygen program, where host is the host name and group is the group name. If host is omitted, the name defaults to the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. Thus, for host beauregard.udel.edu the option -s @@red specifies the Autokey host name beauegard.udel.edu@@red.
A subnet host with a given group name will discard ASSOC packets from all subnets with a different group name. This effectively disables the Autokey protocol without additional packet overhead. For instance, one or more manycast or pool servers will not respond to ASSOC packets from subnets with difference group names. Groups sharing an Ethernet will be filtered in the same way.
However, as shown in Figure 1, there are configurations where a TH of one group needs to listen to a TA of a different group. This is accomplished using the ident group option of the crypto command and/or the ident group option of the server command. The former case applies to all hosts sharing a common broadcast, manycast or symmetric passive modes, while the latter case applies to each individual client/server or symmetric active mode association. In either case the host listens to the specified group name in addition to the group name specified in the -s option of the ntp-keygen program.
NTP security groups are an extension of the NTP subnets described in the previous section. They include in addition to certificate trails one or another identity schemes described on the Autokey Identity Schemes page. NTP secure groups are used to define cryptographic compartments and security hierarchies. The identity scheme insures that the server is authentic and not victim of masquerade by an intruder acting as a middleman.
An NTP secure group is an NTP subnet configured as an acyclic tree rooted on the THs. The THs are at the lowest stratum of the secure group. They run an identity exchange with the TAs of parent subnets All group hosts construct an unbroken certificate trail from each host, possibly via intermediate hosts, and ending at a TH of that group. The TH verifies authenticity with the TA of the parent subnet using an identity exchange.
Figure 2. Identify Scheme
The identity exchange is run between a TA acting as a server and a TH acting as a client. As shown in Figure 2, the identity exchange involves a challenge-response protocol where a client generates a nonce and sends it to the server. The server performs a mathematical operation involving a second nonce and the secret group key, and sends the result along with a hash to the client. The client performs a another mathematical operation and verifies the result with the hash.
Since each exchange involves two nonces, even after repeated observations of many exchanges, an intruder cannot learn the secret group key. It is this quality that allows the secret group key to persist long after the longest period of certificate validity. In the Schnorr (Identify Friend or Foe - IFF) scheme, the secret group key is not divulged to the clients, so they cannot conspire to prove identity to other hosts.
As described on the Autokey Identity Schemes page, there are five identity schemes, three of which - IFF, GQ and MV - require identity files specific to each scheme. There are two types of files for each scheme, an encrypted server keys file and a nonencrypted client keys file, also called the parameters file, which usually contains a subset of the keys file.
Figure 2 shows how keys and parameters are distributed to servers and clients. A TA constructs the encrypted keys file and the nonencrypted parameters file. Hosts with no dependent clients can retrieve client parameter files from an archive or web page. The ntp-keygen program can export parameter files using the -e option. By convention, the file name is the name of the secure group and must match the ident option of the crypto command or the ident option of the server command.
When more than one TH Is involved in the secure group, it is convenient for the TAs and THs to use the same encrypted key files. To do this, one of the parent TAs includes the -i group option on the ntp-keygen command line, where group is the name of the child secure group. The ntp-keygen program can export server keys files using the -q option and a chosen remote password. The files are installed on the TAs and then renamed using the name given as the first line in the file, but without the filestamp. The secure group name must match the ident option for all TAs.
In special circumstances the Autokey message digest algorithm can be changed using the digest option of the crypto command. The digest algorithm is separate and distinct from the symmetric key message digest algorithm. If compliance with FIPS 140-2 is required, the algorithm must be ether SHA or SHA1. The Autokey message digest algorithm must be the same for all participants in the NTP subnet.
Example
Returning to the example of Figure 1, Alice, Helen and Carol run run the Trusted Certificate (TC) scheme, internally, as the environment is secure and without threat from external attack, in particular a middleman masquerade. However, TH X of Carol is vulnerable to masquerade on the links between X and C and between X and S. Therefore, both parent subnet TAs C and S run an identity exchange with child subnet TH X. Both have the same encrypted keys file and X the common parameters file.
Autokey has an intimidating number of options, most of which are not necessary in typical scenarios. However, the Trusted Certificate (TC) scheme is recommended for national NTP time services, such as those operated by NIST and USNO. Configuration for TC is very simple.
Referring to Figure 1, for each TH, A, B, R and X, as root:
# cd /usr/local/etc
# ntp-keygen -T
and for the other hosts the same commands without the -T option. This generates an RSA private/public host key file and a self-signed certificate file for the RSA digital signature algorithm with the MD5 message digest algorithm. For the THs a trusted certificate is generated; for the others a nontreusted certificate is generated. Include in the ntp.conf configuration file for all hosts other than the primary servers, A, B and R, something like
# server host autokey
# crypto
# driftfile /etc/ntp.drift
where host is the selected server name as shown in the figure. Servers A, B and R are configured for local reference clocks or trusted remoter servers as required.
In the above configuration examples, the default host name is the string returned by the Unix gethostname() routine, ordinarily the DNS name of the host. This name is used as the subject and issuer names on the certificate, as well as the default password for the encrypted keys file. The host name can be changed using the -s option of the ntp-keygen program. The default password can be changed using the -p option of the ntp-keygen program and the pw option of the crypto configuration command.
Group names can be added to this configuration by including the -s host@@group option with the ntp-keygen program. For the purpose of illustration, the host string is empty, signifying the default host name. For example, @@yellow can be used for the Alice group, @@orange for the Helen group and @@blue for the Carol group. In addition, for TH X the ident yellow option should be added to the server command for the Alice group and the ident orange option should be added to the server command for the Helen group.
The example in this section uses the IFF identity scheme, but others, including GQ and MV, can be used as well. It's best to start with a functioning TC configuration and add commands as necessary. We start with the subnets of Figure 1 configured as in the previous section. Recall that the parent subnet TA for Alice is C and for Helen is S. Each of the TAs generates an encrypted server keys file and nonencrypted client parameters file for the IFF identity scheme using the -I option of the ntp-keygen program. Note the TAs are not necessarily trusted hosts, so may not need the -T option.
The nonencrypted client parameters can be exported using the command
ntp-keygen -e >file,
where the -e option redirects the client parameters to file via the standard output stream for a mail application or stored locally for later distribution to one or more THs. In a similar fashion the encrypted keys file can be exported using the command
ntp-keygen -q passw2 >file,
where passwd2 is the read password for another TA. We won't need this file here.
While the file names used for the exported files are arbitrary, it is common practice to use the name given as the first line in the file with the filestamp suppressed. Thus, the nonencryted parameters file from each TA is copied to X with this name.
To complete the configuration, the TH includes the client parameters file name in the ident option of the the server command for the TA association
server 1.2.3.4 ident group,
where group is the file name given above.
A specific combination of authentication and identity schemes is called a cryptotype, which applies to clients and servers separately. A group can be configured using more than one cryptotype combination, although not all combinations are interoperable. Note however that some cryptotype combinations may successfully intemperate with each other, but may not represent good security practice. The server and client cryptotypes are defined by the the following codes.
The compatible cryptotypes for clients and servers are listed in the following table.
| Client | Server | ||||
| NONE | AUTH | PC | TC | IDENT | |
| NONE | yes | yes* | yes* | yes* | yes* |
| AUTH | no | yes | no | no | no |
| PC | no | no | yes | no | no |
| TC | no | no | no | yes | yes |
| IDENT | no | no | no | no | yes |
* These combinations are not valid if the restriction list includes the notrust option.
Errors can occur due to mismatched configurations, unexpected protocol restarts, expired certificates and unfriendly people. In most cases the protocol state machine recovers automatically by retransmission, timeout and restart, where necessary. Some errors are due to mismatched keys, digest schemes or identity schemes and must be corrected by installing the correct media and/or correcting the configuration file. One of the most common errors is expired certificates, which must be regenerated and signed at least once per year using the ntp-keygen - generate public and private keys program.
The following error codes are reported via the NTP control and monitoring protocol trap mechanism and to the cryptostats monitoring file if configured.
See the ntp-keygen page. Note that provisions to load leap second values from the NIST files have been removed. These provisions are now available whether or not the OpenSSL library is available. However, the functions that can download these values from servers remains available.
@