Commit Graph

163 Commits

Author SHA1 Message Date
Damien Miller
7acefbbcbe - millert@cvs.openbsd.org 2014/07/15 15:54:14
[PROTOCOL auth-options.c auth-passwd.c auth-rh-rsa.c auth-rhosts.c]
     [auth-rsa.c auth.c auth1.c auth2-hostbased.c auth2-kbdint.c auth2-none.c]
     [auth2-passwd.c auth2-pubkey.c auth2.c canohost.c channels.c channels.h]
     [clientloop.c misc.c misc.h monitor.c mux.c packet.c readconf.c]
     [readconf.h servconf.c servconf.h serverloop.c session.c ssh-agent.c]
     [ssh.c ssh_config.5 sshconnect.c sshconnect1.c sshconnect2.c sshd.c]
     [sshd_config.5 sshlogin.c]
     Add support for Unix domain socket forwarding.  A remote TCP port
     may be forwarded to a local Unix domain socket and vice versa or
     both ends may be a Unix domain socket.  This is a reimplementation
     of the streamlocal patches by William Ahern from:
         http://www.25thandclement.com/~william/projects/streamlocal.html
     OK djm@ markus@
2014-07-18 14:11:24 +10:00
Damien Miller
686feb560e - djm@cvs.openbsd.org 2014/07/03 11:16:55
[auth.c auth.h auth1.c auth2.c]
     make the "Too many authentication failures" message include the
     user, source address, port and protocol in a format similar to the
     authentication success / failure messages; bz#2199, ok dtucker
2014-07-03 21:29:38 +10:00
Damien Miller
1f0311c7c7 - markus@cvs.openbsd.org 2014/04/29 18:01:49
[auth.c authfd.c authfile.c bufaux.c cipher.c cipher.h hostfile.c]
     [kex.c key.c mac.c monitor.c monitor_wrap.c myproposal.h packet.c]
     [roaming_client.c ssh-agent.c ssh-keygen.c ssh-keyscan.c ssh-keysign.c]
     [ssh-pkcs11.h ssh.c sshconnect.c sshconnect2.c sshd.c]
     make compiling against OpenSSL optional (make OPENSSL=no);
     reduces algorithms to curve25519, aes-ctr, chacha, ed25519;
     allows us to explore further options; with and ok djm
2014-05-15 14:24:09 +10:00
Darren Tucker
0acca3797d - djm@cvs.openbsd.org 2013/05/19 02:42:42
[auth.h auth.c key.c monitor.c auth-rsa.c auth2.c auth1.c key.h]
     Standardise logging of supplemental information during userauth. Keys
     and ruser is now logged in the auth success/failure message alongside
     the local username, remote host/port and protocol in use. Certificates
     contents and CA are logged too.
     Pushing all logging onto a single line simplifies log analysis as it is
     no longer necessary to relate information scattered across multiple log
     entries. "I like it" markus@
2013-06-02 07:41:51 +10:00
Darren Tucker
a627d42e51 - djm@cvs.openbsd.org 2013/05/17 00:13:13
[xmalloc.h cipher.c sftp-glob.c ssh-keyscan.c ssh.c sftp-common.c
     ssh-ecdsa.c auth2-chall.c compat.c readconf.c kexgexs.c monitor.c
     gss-genr.c cipher-3des1.c kex.c monitor_wrap.c ssh-pkcs11-client.c
     auth-options.c rsa.c auth2-pubkey.c sftp.c hostfile.c auth2.c
     servconf.c auth.c authfile.c xmalloc.c uuencode.c sftp-client.c
     auth2-gss.c sftp-server.c bufaux.c mac.c session.c jpake.c kexgexc.c
     sshconnect.c auth-chall.c auth2-passwd.c sshconnect1.c buffer.c
     kexecdhs.c kexdhs.c ssh-rsa.c auth1.c ssh-pkcs11.c auth2-kbdint.c
     kexdhc.c sshd.c umac.c ssh-dss.c auth2-jpake.c bufbn.c clientloop.c
     monitor_mm.c scp.c roaming_client.c serverloop.c key.c auth-rsa.c
     ssh-pkcs11-helper.c ssh-keysign.c ssh-keygen.c match.c channels.c
     sshconnect2.c addrmatch.c mux.c canohost.c kexecdhc.c schnorr.c
     ssh-add.c misc.c auth2-hostbased.c ssh-agent.c bufec.c groupaccess.c
     dns.c packet.c readpass.c authfd.c moduli.c]
     bye, bye xfree(); ok markus@
2013-06-02 07:31:17 +10:00
Damien Miller
6332da2ae8 - (djm) [auth.c configure.ac misc.c monitor.c monitor_wrap.c] Support
platforms, such as Android, that lack struct passwd.pw_gecos. Report
   and initial patch from Nathan Osman bz#2086; feedback tim@ ok dtucker@
2013-04-23 14:25:52 +10:00
Darren Tucker
aa97d13fa2 - (dtucker) [auth.c configure.ac platform.c platform.h] Accept uid 2 ("bin")
in addition to root as an owner of system directories on AIX and HP-UX.
   ok djm@
2013-03-12 11:31:05 +11:00
Damien Miller
18de9133c2 - dtucker@cvs.openbsd.org 2013/02/06 00:22:21
[auth.c]
     Fix comment, from jfree.e1 at gmail
2013-02-12 11:02:27 +11:00
Damien Miller
f3747bf401 - djm@cvs.openbsd.org 2013/01/17 23:00:01
[auth.c key.c key.h ssh-keygen.1 ssh-keygen.c sshd_config.5]
     [krl.c krl.h PROTOCOL.krl]
     add support for Key Revocation Lists (KRLs). These are a compact way to
     represent lists of revoked keys and certificates, taking as little as
     a single bit of incremental cost to revoke a certificate by serial number.
     KRLs are loaded via the existing RevokedKeys sshd_config option.
     feedback and ok markus@
2013-01-18 11:44:04 +11:00
Damien Miller
4e14a58f3f - dtucker@cvs.openbsd.org 2012/12/14 05:26:43
[auth.c]
     use correct string in error message; from rustybsd at gmx.fr
2013-01-09 15:54:48 +11:00
Damien Miller
15b05cfa17 - djm@cvs.openbsd.org 2012/12/02 20:34:10
[auth.c auth.h auth1.c auth2-chall.c auth2-gss.c auth2-jpake.c auth2.c]
     [monitor.c monitor.h]
     Fixes logging of partial authentication when privsep is enabled
     Previously, we recorded "Failed xxx" since we reset authenticated before
     calling auth_log() in auth2.c. This adds an explcit "Partial" state.

     Add a "submethod" to auth_log() to report which submethod is used
     for keyboard-interactive.

     Fix multiple authentication when one of the methods is
     keyboard-interactive.

     ok markus@
2012-12-03 09:53:20 +11:00
Damien Miller
09d3e12512 - djm@cvs.openbsd.org 2012/10/30 21:29:55
[auth-rsa.c auth.c auth.h auth2-pubkey.c servconf.c servconf.h]
     [sshd.c sshd_config sshd_config.5]
     new sshd_config option AuthorizedKeysCommand to support fetching
     authorized_keys from a command in addition to (or instead of) from
     the filesystem. The command is run as the target server user unless
     another specified via a new AuthorizedKeysCommandUser option.

     patch originally by jchadima AT redhat.com, reworked by me; feedback
     and ok markus@
2012-10-31 08:58:58 +11:00
Darren Tucker
fbcf827559 - (dtucker) OpenBSD CVS Sync
- dtucker@cvs.openbsd.org 2012/05/13 01:42:32
     [servconf.h servconf.c sshd.8 sshd.c auth.c sshd_config.5]
     Add "Match LocalAddress" and "Match LocalPort" to sshd and adjust tests
     to match.  Feedback and ok djm@ markus@.
2012-05-19 19:37:01 +10:00
Damien Miller
9fed161e67 - djm@cvs.openbsd.org 2012/04/11 13:17:54
[auth.c]
     Support "none" as an argument for AuthorizedPrincipalsFile to indicate
     no file should be read.
2012-04-22 11:21:43 +10:00
Damien Miller
1dd66e5f74 - djm@cvs.openbsd.org 2011/05/23 03:33:38
[auth.c]
     make secure_filename() spam debug logs less
2011-05-29 21:40:42 +10:00
Damien Miller
d8478b6a9b OpenBSD CVS Sync
- djm@cvs.openbsd.org 2011/05/23 03:30:07
     [auth-rsa.c auth.c auth.h auth2-pubkey.c monitor.c monitor_wrap.c pathnames.h servconf.c servconf.h sshd.8 sshd_config sshd_config.5]
     allow AuthorizedKeysFile to specify multiple files, separated by spaces.
     Bring back authorized_keys2 as a default search path (to avoid breaking
     existing users of this file), but override this in sshd_config so it will
     be no longer used on fresh installs. Maybe in 2015 we can remove it
     entierly :)

     feedback and ok markus@ dtucker@
2011-05-29 21:39:36 +10:00
Damien Miller
7c1b2c4ea8 - djm@cvs.openbsd.org 2011/05/11 04:47:06
[auth.c auth.h auth2-pubkey.c pathnames.h servconf.c servconf.h]
     remove support for authorized_keys2; it is a relic from the early days
     of protocol v.2 support and has been undocumented for many years;
     ok markus@
2011-05-15 08:51:05 +10:00
Damien Miller
d925dcd8a5 - djm@cvs.openbsd.org 2010/11/29 23:45:51
[auth.c hostfile.c hostfile.h ssh.c ssh_config.5 sshconnect.c]
     [sshconnect.h sshconnect2.c]
     automatically order the hostkeys requested by the client based on
     which hostkeys are already recorded in known_hosts. This avoids
     hostkey warnings when connecting to servers with new ECDSA keys
     that are preferred by default; with markus@
2010-12-01 12:21:51 +11:00
Damien Miller
6a740e7b92 - djm@cvs.openbsd.org 2010/11/23 02:35:50
[auth.c]
     use strict_modes already passed as function argument over referencing
     global options.strict_modes
2010-12-01 12:01:51 +11:00
Tim Rice
ad7d547acd - (tim) [auth.c] add cast to quiet compiler. Change only affects SVR5 systems. 2010-08-12 10:33:01 -07:00
Damien Miller
c158331f8c - djm@cvs.openbsd.org 2010/08/04 05:42:47
[auth.c auth2-hostbased.c authfile.c authfile.h ssh-keysign.8]
     [ssh-keysign.c ssh.c]
     enable certificates for hostbased authentication, from Iain Morgan;
     "looks ok" markus@
2010-08-05 13:04:50 +10:00
Damien Miller
48147d6801 - djm@cvs.openbsd.org 2010/06/22 04:49:47
[auth.c]
     queue auth debug messages for bad ownership or permissions on the user's
     keyfiles. These messages will be sent after the user has successfully
     authenticated (where our client will display them with LogLevel=debug).
2010-06-26 09:39:25 +10:00
Damien Miller
30da3447d2 - djm@cvs.openbsd.org 2010/05/07 11:30:30
[auth-options.c auth-options.h auth.c auth.h auth2-pubkey.c]
     [key.c servconf.c servconf.h sshd.8 sshd_config.5]
     add some optional indirection to matching of principal names listed
     in certificates. Currently, a certificate must include the a user's name
     to be accepted for authentication. This change adds the ability to
     specify a list of certificate principal names that are acceptable.

     When authenticating using a CA trusted through ~/.ssh/authorized_keys,
     this adds a new principals="name1[,name2,...]" key option.

     For CAs listed through sshd_config's TrustedCAKeys option, a new config
     option "AuthorizedPrincipalsFile" specifies a per-user file containing
     the list of acceptable names.

     If either option is absent, the current behaviour of requiring the
     username to appear in principals continues to apply.

     These options are useful for role accounts, disjoint account namespaces
     and "user@realm"-style naming policies in certificates.

     feedback and ok markus@
2010-05-10 11:58:03 +10:00
Darren Tucker
b3d20a3ff0 - (dtucker) [auth.c] Bug #1710: call setauthdb on AIX before getpwuid so that
it gets the passwd struct from the LAM that knows about the user which is
   not necessarily the default.  Patch from Alexandre Letourneau.
2010-03-07 11:56:59 +11:00
Damien Miller
b068d0ad6d - djm@cvs.openbsd.org 2010/03/05 02:58:11
[auth.c]
     make the warning for a revoked key louder and more noticable
2010-03-05 14:03:03 +11:00
Damien Miller
1aed65eb27 - djm@cvs.openbsd.org 2010/03/04 10:36:03
[auth-rh-rsa.c auth-rsa.c auth.c auth.h auth2-hostbased.c auth2-pubkey.c]
     [authfile.c authfile.h hostfile.c hostfile.h servconf.c servconf.h]
     [ssh-keygen.c ssh.1 sshconnect.c sshd_config.5]
     Add a TrustedUserCAKeys option to sshd_config to specify CA keys that
     are trusted to authenticate users (in addition than doing it per-user
     in authorized_keys).

     Add a RevokedKeys option to sshd_config and a @revoked marker to
     known_hosts to allow keys to me revoked and banned for user or host
     authentication.

     feedback and ok markus@
2010-03-04 21:53:35 +11:00
Damien Miller
acc9b29486 - (djm) [auth.c] On Cygwin, refuse usernames that have differences in
case from that matched in the system password database. On this
   platform, passwords are stored case-insensitively, but sshd requires
   exact case matching for Match blocks in sshd_config(5). Based on
   a patch from vinschen AT redhat.com.
2010-03-01 04:36:54 +11:00
Damien Miller
47cf16b8df - djm@cvs.openbsd.org 2010/02/09 06:18:46
[auth.c]
     unbreak ChrootDirectory+internal-sftp by skipping check for executable
     shell when chrooting; reported by danh AT wzrd.com; ok dtucker@
2010-02-12 09:25:29 +11:00
Darren Tucker
94881d8dbb - djm@cvs.openbsd.org 2010/01/13 23:47:26
[auth.c]
     when using ChrootDirectory, make sure we test for the existence of the
     user's shell inside the chroot; bz #1679, patch from alex AT rtfs.hu;
     ok dtucker
2010-01-15 11:44:46 +11:00
Darren Tucker
e2b3674172 - (dtucker) OpenBSD CVS Sync
- dtucker@cvs.openbsd.org 2010/01/13 00:19:04
     [sshconnect.c auth.c]
     Fix a couple of typos/mispellings in comments
2010-01-13 22:42:34 +11:00
Darren Tucker
43551527dc - dtucker@cvs.openbsd.org 2010/01/10 07:15:56
[auth.c]
     Output a debug if we can't open an existing keyfile.  bz#1694, ok djm@
2010-01-10 19:27:17 +11:00
Damien Miller
6f66d34308 - djm@cvs.openbsd.org 2008/11/04 07:58:09
[auth.c]
     need unistd.h for close() prototype
     (ID sync only)
2008-11-05 16:12:54 +11:00
Damien Miller
7acf550aeb - (djm) [auth.c] Missing unistd.h for close() 2008-07-09 20:54:37 +10:00
Damien Miller
22989f1b5e - (djm) [auth.c] Fixed test for locked account on HP/UX with shadowed
passwords disabled. bz#1083 report & patch from senthilkumar_sen AT
   hotpop.com, w/ dtucker@
2008-07-05 08:59:43 +10:00
Darren Tucker
33c787f23c - dtucker@cvs.openbsd.org 2008/07/02 12:03:51
[auth-rsa.c auth.c auth2-pubkey.c auth.h]
     Merge duplicate host key file checks, based in part on a patch from Rob
     Holland via bz #1348 .  Also checks for non-regular files during protocol
     1 RSA auth.  ok djm@
2008-07-02 22:37:30 +10:00
Damien Miller
733124b5dd - djm@cvs.openbsd.org 2007/09/21 08:15:29
[auth-bsdauth.c auth-passwd.c auth.c auth.h auth1.c auth2-chall.c]
     [monitor.c monitor_wrap.c]
     unifdef -DBSD_AUTH
     unifdef -USKEY
     These options have been in use for some years;
     ok markus@ "no objection" millert@
     (NB. RCD ID sync only for portable)
2007-10-26 14:25:12 +10:00
Damien Miller
6ef50134c2 - djm@cvs.openbsd.org 2007/08/23 02:55:51
[auth-passwd.c auth.c session.c]
     missed include bits from last commit
     NB. RCS ID sync only for portable
2007-09-17 11:54:24 +10:00
Damien Miller
6572db28fd - djm@cvs.openbsd.org 2007/08/23 02:49:43
[auth-passwd.c auth.c session.c]
     unifdef HAVE_LOGIN_CAP; ok deraadt@ millert@
     NB. RCS ID sync only for portable
2007-09-17 11:52:59 +10:00
Tim Rice
99203ec48b 20070326
- (tim) [auth.c configure.ac defines.h session.c openbsd-compat/port-uw.c
   openbsd-compat/port-uw.h openbsd-compat/xcrypt.c] Rework libiaf test/defines
   to account for IRIX having libiaf but not set_id(). Patch with & ok dtucker@
2007-03-26 09:35:28 -07:00
Damien Miller
143c2ef1ce - (djm) [auth.c] Fix NULL pointer dereference in fakepw(). Crash would
occur if the server did not have the privsep user and an invalid user
   tried to login and both privsep and krb5 auth are disabled.
2006-12-05 09:08:54 +11:00
Damien Miller
796c6c693d - (djm) [auth.c] gc some dead code 2006-10-28 01:10:15 +10:00
Damien Miller
6433df036e - (djm) [sshd.c auth.c] Set up fakepw() with privsep uid/gid, so it can
be used to drop privilege to; fixes Solaris GSSAPI crash reported by
   Magnus Abrante; suggestion and feedback dtucker@
   NB. this change will require that the privilege separation user must
   exist on all the time, not just when UsePrivilegeSeparation=yes
2006-09-07 10:36:43 +10:00
Darren Tucker
26d4e19caa - (dtucker) [auth.c openbsd-compat/port-aix.c] Bug #1207: always call
loginsuccess on AIX immediately after authentication to clear the failed
   login count.  Previously this would only happen when an interactive
   session starts (ie when a pty is allocated) but this means that accounts
   that have primarily non-interactive sessions (eg scp's) may gradually
   accumulate enough failures to lock out an account.  This change may have
   a side effect of creating two audit records, one with a tty of "ssh"
   corresponding to the authentication and one with the allocated pty per
   interactive session.
2006-08-30 22:33:09 +10:00
Damien Miller
36cbe41ceb - (djm) [auth.c loginrec.c] Missing netinet/in.h for loginrec 2006-08-05 12:54:24 +10:00
Damien Miller
4cbfe8ebeb - (djm) [auth-pam.c auth.c bufaux.h entropy.c openbsd-compat/port-tun.c]
remove last traces of bufaux.h - it was merged into buffer.h in the big
   includes.h commit
2006-08-05 12:49:30 +10:00
Damien Miller
d783435315 - deraadt@cvs.openbsd.org 2006/08/03 03:34:42
[OVERVIEW atomicio.c atomicio.h auth-bsdauth.c auth-chall.c auth-krb5.c]
     [auth-options.c auth-options.h auth-passwd.c auth-rh-rsa.c auth-rhosts.c]
     [auth-rsa.c auth-skey.c auth.c auth.h auth1.c auth2-chall.c auth2-gss.c]
     [auth2-hostbased.c auth2-kbdint.c auth2-none.c auth2-passwd.c ]
     [auth2-pubkey.c auth2.c authfd.c authfd.h authfile.c bufaux.c bufbn.c]
     [buffer.c buffer.h canohost.c channels.c channels.h cipher-3des1.c]
     [cipher-bf1.c cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c]
     [compress.c deattack.c dh.c dispatch.c dns.c dns.h fatal.c groupaccess.c]
     [groupaccess.h gss-genr.c gss-serv-krb5.c gss-serv.c hostfile.c kex.c]
     [kex.h kexdh.c kexdhc.c kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c]
     [key.h log.c log.h mac.c match.c md-sha256.c misc.c misc.h moduli.c]
     [monitor.c monitor_fdpass.c monitor_mm.c monitor_mm.h monitor_wrap.c]
     [monitor_wrap.h msg.c nchan.c packet.c progressmeter.c readconf.c]
     [readconf.h readpass.c rsa.c scard.c scard.h scp.c servconf.c servconf.h]
     [serverloop.c session.c session.h sftp-client.c sftp-common.c]
     [sftp-common.h sftp-glob.c sftp-server.c sftp.c ssh-add.c ssh-agent.c]
     [ssh-dss.c ssh-gss.h ssh-keygen.c ssh-keyscan.c ssh-keysign.c ssh-rsa.c]
     [ssh.c ssh.h sshconnect.c sshconnect.h sshconnect1.c sshconnect2.c]
     [sshd.c sshlogin.c sshlogin.h sshpty.c sshpty.h sshtty.c ttymodes.c]
     [uidswap.c uidswap.h uuencode.c uuencode.h xmalloc.c xmalloc.h]
     [loginrec.c loginrec.h openbsd-compat/port-aix.c openbsd-compat/port-tun.h]
     almost entirely get rid of the culture of ".h files that include .h files"
     ok djm, sort of ok stevesk
     makes the pain stop in one easy step
     NB. portable commit contains everything *except* removing includes.h, as
     that will take a fair bit more work as we move headers that are required
     for portability workarounds to defines.h. (also, this step wasn't "easy")
2006-08-05 12:39:39 +10:00
Damien Miller
a7a73ee35d - stevesk@cvs.openbsd.org 2006/08/01 23:22:48
[auth-passwd.c auth-rhosts.c auth-rsa.c auth.c auth.h auth1.c]
     [auth2-chall.c auth2-pubkey.c authfile.c buffer.c canohost.c]
     [channels.c clientloop.c dh.c dns.c dns.h hostfile.c kex.c kexdhc.c]
     [kexgexc.c kexgexs.c key.c key.h log.c misc.c misc.h moduli.c]
     [monitor_wrap.c packet.c progressmeter.c readconf.c readpass.c scp.c]
     [servconf.c session.c sftp-client.c sftp-common.c sftp-server.c sftp.c]
     [ssh-add.c ssh-agent.c ssh-keygen.c ssh-keyscan.c ssh.c sshconnect.c]
     [sshconnect1.c sshconnect2.c sshd.c sshlogin.c sshtty.c uuencode.c]
     [uuencode.h xmalloc.c]
     move #include <stdio.h> out of includes.h
2006-08-05 11:37:59 +10:00
Damien Miller
8dbffe7904 - stevesk@cvs.openbsd.org 2006/07/26 02:35:17
[atomicio.c auth.c dh.c authfile.c buffer.c clientloop.c kex.c]
     [groupaccess.c gss-genr.c kexgexs.c misc.c monitor.c monitor_mm.c]
     [packet.c scp.c serverloop.c session.c sftp-client.c sftp-common.c]
     [sftp-server.c sftp.c ssh-add.c ssh-agent.c ssh-keygen.c sshlogin.c]
     [uidswap.c xmalloc.c]
     move #include <sys/param.h> out of includes.h
2006-08-05 11:02:17 +10:00
Damien Miller
e3476ed03b - stevesk@cvs.openbsd.org 2006/07/22 20:48:23
[atomicio.c auth-options.c auth-passwd.c auth-rhosts.c auth-rsa.c]
     [auth.c auth1.c auth2-chall.c auth2-hostbased.c auth2-passwd.c auth2.c]
     [authfd.c authfile.c bufaux.c bufbn.c buffer.c canohost.c channels.c]
     [cipher-3des1.c cipher-bf1.c cipher-ctr.c cipher.c clientloop.c]
     [compat.c deattack.c dh.c dns.c gss-genr.c gss-serv.c hostfile.c]
     [includes.h kex.c kexdhc.c kexdhs.c kexgexc.c kexgexs.c key.c log.c]
     [mac.c match.c md-sha256.c misc.c moduli.c monitor.c monitor_fdpass.c]
     [monitor_mm.c monitor_wrap.c msg.c nchan.c packet.c rsa.c]
     [progressmeter.c readconf.c readpass.c scp.c servconf.c serverloop.c]
     [session.c sftp-client.c sftp-common.c sftp-glob.c sftp-server.c sftp.c]
     [ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c]
     [ssh-keysign.c ssh-rsa.c ssh.c sshconnect.c sshconnect1.c sshconnect2.c]
     [sshd.c sshlogin.c sshpty.c ttymodes.c uidswap.c xmalloc.c]
     move #include <string.h> out of includes.h
2006-07-24 14:13:33 +10:00
Darren Tucker
4515047e47 - dtucker@cvs.openbsd.org 2006/07/12 11:34:58
[sshd.c servconf.h servconf.c sshd_config.5 auth.c]
     Add support for conditional directives to sshd_config via a "Match"
     keyword, which works similarly to the "Host" directive in ssh_config.
     Lines after a Match line override the default set in the main section
     if the condition on the Match line is true, eg
     AllowTcpForwarding yes
     Match User anoncvs
             AllowTcpForwarding no
     will allow port forwarding by all users except "anoncvs".
     Currently only a very small subset of directives are supported.
     ok djm@
2006-07-12 22:34:17 +10:00