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introduced to match the behaviour of non-free SSH, in which -q does not
suppress fatal errors, but matching the behaviour of OpenSSH upstream is
much more important nowadays. We no longer document that -q does not
suppress fatal errors (closes: #280609). Migrate "LogLevel SILENT" to
"LogLevel QUIET" in sshd_config on upgrade.
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backported to 4.7p1:
- 4.9/4.9p1 (http://www.openssh.com/txt/release-4.9):
+ Added chroot(2) support for sshd(8), controlled by a new option
"ChrootDirectory" (closes: #139047, LP: #24777).
+ Linked sftp-server(8) into sshd(8). The internal sftp server is used
when the command "internal-sftp" is specified in a Subsystem or
ForceCommand declaration. When used with ChrootDirectory, the
internal sftp server requires no special configuration of files
inside the chroot environment.
+ Added a protocol extension method "posix-rename@openssh.com" for
sftp-server(8) to perform POSIX atomic rename() operations; sftp(1)
prefers this if available (closes: #308561).
+ Removed the fixed limit of 100 file handles in sftp-server(8).
+ ssh(8) will now skip generation of SSH protocol 1 ephemeral server
keys when in inetd mode and protocol 2 connections are negotiated.
This speeds up protocol 2 connections to inetd-mode servers that
also allow Protocol 1.
+ Accept the PermitRootLogin directive in a sshd_config(5) Match
block. Allows for, e.g. permitting root only from the local network.
+ Reworked sftp(1) argument splitting and escaping to be more
internally consistent (i.e. between sftp commands) and more
consistent with sh(1). Please note that this will change the
interpretation of some quoted strings, especially those with
embedded backslash escape sequences.
+ Support "Banner=none" in sshd_config(5) to disable sending of a
pre-login banner (e.g. in a Match block).
+ ssh(1) ProxyCommands are now executed with $SHELL rather than
/bin/sh.
+ ssh(1)'s ConnectTimeout option is now applied to both the TCP
connection and the SSH banner exchange (previously it just covered
the TCP connection). This allows callers of ssh(1) to better detect
and deal with stuck servers that accept a TCP connection but don't
progress the protocol, and also makes ConnectTimeout useful for
connections via a ProxyCommand.
+ scp(1) incorrectly reported "stalled" on slow copies (closes:
#140828).
+ scp(1) date underflow for timestamps before epoch.
+ ssh(1) used the obsolete SIG DNS RRtype for host keys in DNS,
instead of the current standard RRSIG.
+ Correctly drain ACKs when a sftp(1) upload write fails midway,
avoids a fatal() exit from what should be a recoverable condition.
+ Fixed ssh-keygen(1) selective host key hashing (i.e. "ssh-keygen -HF
hostname") to not include any IP address in the data to be hashed.
+ Make ssh(1) skip listening on the IPv6 wildcard address when a
binding address of 0.0.0.0 is used against an old SSH server that
does not support the RFC4254 syntax for wildcard bind addresses.
+ Enable IPV6_V6ONLY socket option on sshd(8) listen socket, as is
already done for X11/TCP forwarding sockets (closes: #439661).
+ Fix FD leak that could hang a ssh(1) connection multiplexing master.
+ Make ssh(1) -q option documentation consistent with reality.
+ Fixed sshd(8) PAM support not calling pam_session_close(), or
failing to call it with root privileges (closes: #372680).
+ Fix activation of OpenSSL engine support when requested in configure
(LP: #119295).
- 5.1/5.1p1 (http://www.openssh.com/txt/release-5.1):
+ Introduce experimental SSH Fingerprint ASCII Visualisation to ssh(1)
and ssh-keygen(1). Visual fingerprint display is controlled by a new
ssh_config(5) option "VisualHostKey". The intent is to render SSH
host keys in a visual form that is amenable to easy recall and
rejection of changed host keys.
+ sshd_config(5) now supports CIDR address/masklen matching in "Match
address" blocks, with a fallback to classic wildcard matching.
+ sshd(8) now supports CIDR matching in ~/.ssh/authorized_keys
from="..." restrictions, also with a fallback to classic wildcard
matching.
+ Added an extended test mode (-T) to sshd(8) to request that it write
its effective configuration to stdout and exit. Extended test mode
also supports the specification of connection parameters (username,
source address and hostname) to test the application of
sshd_config(5) Match rules.
+ ssh(1) now prints the number of bytes transferred and the overall
connection throughput for SSH protocol 2 sessions when in verbose
mode (previously these statistics were displayed for protocol 1
connections only).
+ sftp-server(8) now supports extension methods statvfs@openssh.com
and fstatvfs@openssh.com that implement statvfs(2)-like operations.
+ sftp(1) now has a "df" command to the sftp client that uses the
statvfs@openssh.com to produce a df(1)-like display of filesystem
space and inode utilisation (requires statvfs@openssh.com support on
the server).
+ Added a MaxSessions option to sshd_config(5) to allow control of the
number of multiplexed sessions supported over a single TCP
connection. This allows increasing the number of allowed sessions
above the previous default of 10, disabling connection multiplexing
(MaxSessions=1) or disallowing login/shell/subsystem sessions
entirely (MaxSessions=0).
+ Added a no-more-sessions@openssh.com global request extension that
is sent from ssh(1) to sshd(8) when the client knows that it will
never request another session (i.e. when session multiplexing is
disabled). This allows a server to disallow further session requests
and terminate the session in cases where the client has been
hijacked.
+ ssh-keygen(1) now supports the use of the -l option in combination
with -F to search for a host in ~/.ssh/known_hosts and display its
fingerprint.
+ ssh-keyscan(1) now defaults to "rsa" (protocol 2) keys, instead of
"rsa1".
+ Added an AllowAgentForwarding option to sshd_config(8) to control
whether authentication agent forwarding is permitted. Note that this
is a loose control, as a client may install their own unofficial
forwarder.
+ ssh(1) and sshd(8): avoid unnecessary malloc/copy/free when
receiving network data, resulting in a ~10% speedup.
+ ssh(1) and sshd(8) will now try additional addresses when connecting
to a port forward destination whose DNS name resolves to more than
one address. The previous behaviour was to try the only first
address and give up if that failed.
+ ssh(1) and sshd(8) now support signalling that channels are
half-closed for writing, through a channel protocol extension
notification "eow@openssh.com". This allows propagation of closed
file descriptors, so that commands such as "ssh -2 localhost od
/bin/ls | true" do not send unnecessary data over the wire.
+ sshd(8): increased the default size of ssh protocol 1 ephemeral keys
from 768 to 1024 bits.
+ When ssh(1) has been requested to fork after authentication ("ssh
-f") with ExitOnForwardFailure enabled, delay the fork until after
replies for any -R forwards have been seen. Allows for robust
detection of -R forward failure when using -f.
+ "Match group" blocks in sshd_config(5) now support negation of
groups. E.g. "Match group staff,!guests".
+ sftp(1) and sftp-server(8) now allow chmod-like operations to set
set[ug]id/sticky bits.
+ The MaxAuthTries option is now permitted in sshd_config(5) match
blocks.
+ Multiplexed ssh(1) sessions now support a subset of the ~ escapes
that are available to a primary connection.
+ ssh(1) connection multiplexing will now fall back to creating a new
connection in most error cases (closes: #352830).
+ Make ssh(1) deal more gracefully with channel requests that fail.
Previously it would optimistically assume that requests would always
succeed, which could cause hangs if they did not (e.g. when the
server runs out of file descriptors).
+ ssh(1) now reports multiplexing errors via the multiplex slave's
stderr where possible (subject to LogLevel in the mux master).
+ Prevent sshd(8) from erroneously applying public key restrictions
leaned from ~/.ssh/authorized_keys to other authentication methods
when public key authentication subsequently fails (LP: #161047).
+ Fixed an UMAC alignment problem that manifested on Itanium
platforms.
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[sftp.h log.h]
replace __dead with __attribute__((noreturn)), makes things
a little easier to port. Also, add it to sigdie(). ok djm@
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[sshd.c channels.h channels.c log.c servconf.c log.h servconf.h sshd.8]
Add extended test mode (-T) and connection parameters for test mode (-C).
-T causes sshd to write its effective configuration to stdout and exit.
-C causes any relevant Match rules to be applied before output. The
combination allows tesing of the parser and config files. ok deraadt djm
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changes not previously backported to 4.3p2:
- 4.4/4.4p1 (http://www.openssh.org/txt/release-4.4):
+ On portable OpenSSH, fix a GSSAPI authentication abort that could be
used to determine the validity of usernames on some platforms.
+ Implemented conditional configuration in sshd_config(5) using the
"Match" directive. This allows some configuration options to be
selectively overridden if specific criteria (based on user, group,
hostname and/or address) are met. So far a useful subset of
post-authentication options are supported and more are expected to
be added in future releases.
+ Add support for Diffie-Hellman group exchange key agreement with a
final hash of SHA256.
+ Added a "ForceCommand" directive to sshd_config(5). Similar to the
command="..." option accepted in ~/.ssh/authorized_keys, this forces
the execution of the specified command regardless of what the user
requested. This is very useful in conjunction with the new "Match"
option.
+ Add a "PermitOpen" directive to sshd_config(5). This mirrors the
permitopen="..." authorized_keys option, allowing fine-grained
control over the port-forwardings that a user is allowed to
establish.
+ Add optional logging of transactions to sftp-server(8).
+ ssh(1) will now record port numbers for hosts stored in
~/.ssh/known_hosts when a non-standard port has been requested
(closes: #50612).
+ Add an "ExitOnForwardFailure" option to cause ssh(1) to exit (with a
non-zero exit code) when requested port forwardings could not be
established.
+ Extend sshd_config(5) "SubSystem" declarations to allow the
specification of command-line arguments.
+ Replacement of all integer overflow susceptible invocations of
malloc(3) and realloc(3) with overflow-checking equivalents.
+ Many manpage fixes and improvements.
+ Add optional support for OpenSSL hardware accelerators (engines),
enabled using the --with-ssl-engine configure option.
+ Tokens in configuration files may be double-quoted in order to
contain spaces (closes: #319639).
+ Move a debug() call out of a SIGCHLD handler, fixing a hang when the
session exits very quickly (closes: #307890).
+ Fix some incorrect buffer allocation calculations (closes: #410599).
+ ssh-add doesn't ask for a passphrase if key file permissions are too
liberal (closes: #103677).
+ Likewise, ssh doesn't ask either (closes: #99675).
- 4.6/4.6p1 (http://www.openssh.org/txt/release-4.6):
+ sshd now allows the enabling and disabling of authentication methods
on a per user, group, host and network basis via the Match directive
in sshd_config.
+ Fixed an inconsistent check for a terminal when displaying scp
progress meter (closes: #257524).
+ Fix "hang on exit" when background processes are running at the time
of exit on a ttyful/login session (closes: #88337).
* Update to current GSSAPI patch from
http://www.sxw.org.uk/computing/patches/openssh-4.6p1-gsskex-20070312.patch;
install ChangeLog.gssapi.
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signal handler was vulnerable to a race condition that could be
exploited to perform a pre-authentication denial of service. On
portable OpenSSH, this vulnerability could theoretically lead to
pre-authentication remote code execution if GSSAPI authentication is
enabled, but the likelihood of successful exploitation appears remote.
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[log.c log.h sshd.c]
make signal handler termination path shorter; risky code pointed out by
mark dowd; ok djm markus
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[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")
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[canohost.c channels.c cipher-acss.c defines.h dns.c gss-genr.c]
[gss-serv-krb5.c gss-serv.c log.h loginrec.c logintest.c readconf.c]
[servconf.c ssh-keygen.c ssh-keyscan.c ssh-keysign.c ssh-rand-helper.c]
[ssh.c sshconnect.c sshd.c openbsd-compat/bindresvport.c]
[openbsd-compat/bsd-arc4random.c openbsd-compat/bsd-misc.c]
[openbsd-compat/getrrsetbyname.c openbsd-compat/glob.c]
[openbsd-compat/mktemp.c openbsd-compat/port-linux.c]
[openbsd-compat/port-tun.c openbsd-compat/readpassphrase.c]
[openbsd-compat/setproctitle.c openbsd-compat/xmmap.c]
make the portable tree compile again - sprinkle unistd.h and string.h
back in. Don't redefine __unused, as it turned out to be used in
headers on Linux, and replace its use in auth-pam.c with ARGSUSED
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[readpass.c log.h scp.c fatal.c xmalloc.c includes.h ssh-keyscan.c misc.c
auth.c packet.c log.c]
move #include <stdarg.h> out of includes.h; ok markus@
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[atomicio.h auth-options.h auth.h auth2-gss.c authfd.h authfile.h]
[bufaux.h buffer.h canohost.h channels.h cipher.h clientloop.h]
[compat.h compress.h crc32.c crc32.h deattack.h dh.h dispatch.h]
[dns.c dns.h getput.h groupaccess.h gss-genr.c gss-serv-krb5.c]
[gss-serv.c hostfile.h includes.h kex.h key.h log.h mac.h match.h]
[misc.h monitor.h monitor_fdpass.h monitor_mm.h monitor_wrap.h msg.h]
[myproposal.h packet.h pathnames.h progressmeter.h readconf.h rsa.h]
[scard.h servconf.h serverloop.h session.h sftp-common.h sftp.h]
[ssh-gss.h ssh.h ssh1.h ssh2.h sshconnect.h sshlogin.h sshpty.h]
[ttymodes.h uidswap.h uuencode.h xmalloc.h]
standardise spacing in $OpenBSD$ tags; requested by deraadt@
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[log.h]
mark fatal and cleanup exit as __dead; ok markus@
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extensively yet.
ProtocolKeepAlives is now just a compatibility alias for
ServerAliveInterval.
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[Makefile.in auth1.c auth2.c auth.c auth.h auth-krb5.c canohost.c
cleanup.c clientloop.c fatal.c gss-serv.c log.c log.h monitor.c monitor.h
monitor_wrap.c monitor_wrap.h packet.c serverloop.c session.c session.h
ssh-agent.c sshd.c]
replace fatal_cleanup() and linked list of fatal callbacks with static
cleanup_exit() function. re-refine cleanup_exit() where appropriate,
allocate sshd's authctxt eary to allow simpler cleanup in sshd.
tested by many, ok deraadt@
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work.
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[log.c log.h session.c sshd.c]
remove fatal cleanups after fork; based on discussions with and code
from solar.
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[log.h]
extra commas in enum not 100% portable
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[log.c log.h ssh-keyscan.c]
overwrite fatal() in ssh-keyscan.c; fixes pr 2354; ok provos@
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[log.c log.h readconf.c servconf.c]
add SYSLOG_FACILITY_NOT_SET = -1, SYSLOG_LEVEL_NOT_SET = -1,
fixes arm/netbsd; based on patch from bjh21@netbsd.org; ok djm@
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[authfd.h authfile.h auth.h auth-options.h bufaux.h buffer.h
canohost.h channels.h cipher.h clientloop.h compat.h compress.h
crc32.h deattack.h dh.h dispatch.h groupaccess.c groupaccess.h
hostfile.h kex.h key.h log.c log.h mac.h misc.c misc.h mpaux.h
packet.h radix.h readconf.h readpass.h rsa.h servconf.h serverloop.h
session.h sftp-common.c sftp-common.h sftp-glob.h sftp-int.h
sshconnect.h ssh-dss.h sshlogin.h sshpty.h ssh-rsa.h sshtty.h
tildexpand.h uidswap.h uuencode.h xmalloc.h]
remove comments from .h, since they are cut&paste from the .c files
and out of sync
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[atomicio.h authfd.h authfile.h auth.h auth-options.h bufaux.h
buffer.h canohost.h channels.h cipher.h clientloop.h compat.h
compress.h crc32.h deattack.h dh.h dispatch.h groupaccess.h
hostfile.h kex.h key.h log.h mac.h match.h misc.h mpaux.h packet.h
radix.h readconf.h readpass.h rsa.h]
prototype pedant. not very creative...
- () -> (void)
- no variable names
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[many files; did this manually to our top-level source dir]
unexpand and remove end-of-line whitespace; ok markus@
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[atomicio.h canohost.h clientloop.h deattack.h dh.h dispatch.h
groupaccess.c groupaccess.h hmac.h hostfile.h includes.h kex.h
key.h log.h login.h match.h misc.h myproposal.h nchan.ms pathnames.h
radix.h readpass.h rijndael.h serverloop.h session.h sftp.h ssh-add.1
ssh-dss.h ssh-keygen.1 ssh-keyscan.1 ssh-rsa.h ssh1.h ssh_config
sshconnect.h sshd_config tildexpand.h uidswap.h uuencode.h]
$OpenBSD$
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Linux and works. So that is at least a good sign. =)
20010122
- (bal) OpenBSD Resync
- markus@cvs.openbsd.org 2001/01/19 12:45:26 GMT 2001 by markus
[servconf.c ssh.h sshd.c]
only auth-chall.c needs #ifdef SKEY
- markus@cvs.openbsd.org 2001/01/19 15:55:10 GMT 2001 by markus
[auth-krb4.c auth-options.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c
auth1.c auth2.c channels.c clientloop.c dh.c dispatch.c nchan.c
packet.c pathname.h readconf.c scp.c servconf.c serverloop.c
session.c ssh-add.c ssh-keygen.c ssh-keyscan.c ssh.c ssh.h
ssh1.h sshconnect1.c sshd.c ttymodes.c]
move ssh1 definitions to ssh1.h, pathnames to pathnames.h
- markus@cvs.openbsd.org 2001/01/19 16:48:14
[sshd.8]
fix typo; from stevesk@
- markus@cvs.openbsd.org 2001/01/19 16:50:58
[ssh-dss.c]
clear and free digest, make consistent with other code (use dlen); from
stevesk@
- markus@cvs.openbsd.org 2001/01/20 15:55:20 GMT 2001 by markus
[auth-options.c auth-options.h auth-rsa.c auth2.c]
pass the filename to auth_parse_options()
- markus@cvs.openbsd.org 2001/01/20 17:59:40 GMT 2001
[readconf.c]
fix SIGSEGV from -o ""; problem noted by jehsom@togetherweb.com
- stevesk@cvs.openbsd.org 2001/01/20 18:20:29
[sshconnect2.c]
dh_new_group() does not return NULL. ok markus@
- markus@cvs.openbsd.org 2001/01/20 21:33:42
[ssh-add.c]
do not loop forever if askpass does not exist; from
andrew@pimlott.ne.mediaone.net
- djm@cvs.openbsd.org 2001/01/20 23:00:56
[servconf.c]
Check for NULL return from strdelim; ok markus
- djm@cvs.openbsd.org 2001/01/20 23:02:07
[readconf.c]
KNF; ok markus
- jakob@cvs.openbsd.org 2001/01/21 9:00:33
[ssh-keygen.1]
remove -R flag; ok markus@
- markus@cvs.openbsd.org 2001/01/21 19:05:40
[atomicio.c automicio.h auth-chall.c auth-krb4.c auth-options.c
auth-options.h auth-passwd.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c
auth.c auth.h auth1.c auth2-chall.c auth2.c authfd.c authfile.c
bufaux.c bufaux.h buffer.c canahost.c canahost.h channels.c
cipher.c cli.c clientloop.c clientloop.h compat.c compress.c
deattack.c dh.c dispatch.c groupaccess.c hmac.c hostfile.c kex.c
key.c key.h log-client.c log-server.c log.c log.h login.c login.h
match.c misc.c misc.h nchan.c packet.c pty.c radix.h readconf.c
readpass.c readpass.h rsa.c scp.c servconf.c serverloop.c serverloop.h
session.c sftp-server.c ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c
ssh-keyscan.c ssh-rsa.c ssh.c ssh.h sshconnect.c sshconnect.h
sshconnect1.c sshconnect2.c sshd.c tildexpand.c tildexpand.h
ttysmodes.c uidswap.c xmalloc.c]
split ssh.h and try to cleanup the #include mess. remove unnecessary
#includes. rename util.[ch] -> misc.[ch]
- (bal) renamed 'PIDDIR' to '_PATH_SSH_PIDDIR' to match OpenBSD tree
- (bal) Moved #ifdef KRB4 in auth-krb4.c above the #include to resolve
conflict when compiling for non-kerb install
- (bal) removed the #ifdef SKEY in auth1.c to match Markus' changes
on 1/19.
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