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for a while, but there's no GSSAPI patch available for it yet.
- Change the default cipher order to prefer the AES CTR modes and the
revised "arcfour256" mode to CBC mode ciphers that are susceptible to
CPNI-957037 "Plaintext Recovery Attack Against SSH".
- Add countermeasures to mitigate CPNI-957037-style attacks against the
SSH protocol's use of CBC-mode ciphers. Upon detection of an invalid
packet length or Message Authentication Code, ssh/sshd will continue
reading up to the maximum supported packet length rather than
immediately terminating the connection. This eliminates most of the
known differences in behaviour that leaked information about the
plaintext of injected data which formed the basis of this attack
(closes: #506115, LP: #379329).
- ForceCommand directive now accepts commandline arguments for the
internal-sftp server (closes: #524423, LP: #362511).
- Add AllowAgentForwarding to available Match keywords list (closes:
#540623).
- Make ssh(1) send the correct channel number for
SSH2_MSG_CHANNEL_SUCCESS and SSH2_MSG_CHANNEL_FAILURE messages to
avoid triggering 'Non-public channel' error messages on sshd(8) in
openssh-5.1.
- Avoid printing 'Non-public channel' warnings in sshd(8), since the
ssh(1) has sent incorrect channel numbers since ~2004 (this reverts a
behaviour introduced in openssh-5.1; closes: #496017).
* Update to GSSAPI patch from
http://www.sxw.org.uk/computing/patches/openssh-5.2p1-gsskex-all-20090726.patch,
including cascading credentials support (LP: #416958).
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[ssh-keygen.1]
Add "ssh-keygen -F -l" to synopsis (displays fingerprint from
known_hosts). ok djm@
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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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[ssh_config.5 ssh-keygen.1]
tweak the ascii art text; ok grunk
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[ssh-keygen.c ssh-keygen.1]
ssh-keygen would write fingerprints to STDOUT, and random art to STDERR,
that is not how it was envisioned.
Also correct manpage saying that -v is needed along with -l for it to work.
spotted by naddy@
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[ssh_config.5 key.h readconf.c readconf.h ssh-keygen.1 ssh-keygen.c key.c
sshconnect.c]
Introduce SSH Fingerprint ASCII Visualization, a technique inspired by the
graphical hash visualization schemes known as "random art", and by
Dan Kaminsky's musings on the subject during a BlackOp talk at the
23C3 in Berlin.
Scientific publication (original paper):
"Hash Visualization: a New Technique to improve Real-World Security",
Perrig A. and Song D., 1999, International Workshop on Cryptographic
Techniques and E-Commerce (CrypTEC '99)
http://sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
The algorithm used here is a worm crawling over a discrete plane,
leaving a trace (augmenting the field) everywhere it goes.
Movement is taken from dgst_raw 2bit-wise. Bumping into walls
makes the respective movement vector be ignored for this turn,
thus switching to the other color of the chessboard.
Graphs are not unambiguous for now, because circles in graphs can be
walked in either direction.
discussions with several people,
help, corrections and ok markus@ djm@
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ssh-keygen(1), and sshd(8) (closes: #484451).
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[scp.1 ssh_config.5 sftp-server.8 ssh-agent.1 sshd_config.5 sftp.1
ssh-keygen.1 ssh-keyscan.1 ssh-add.1 sshd.8 ssh.1 ssh-keysign.8]
convert to new .Dd format;
(We will need to teach mdoc2man.awk to understand this too.)
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[ssh-keygen.1 ssh-keygen.c]
more secsh -> rfc 4716 updates;
spotted by wiz@netbsd
ok markus
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[ssh-keygen.1 ssh.1]
add rfc 4716 (public key format); ok jmc
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Enforce DSA key length of exactly 1024 bits to comply with FIPS-186-2,
increase minumum RSA key size to 768 bits and update man page to reflect
these. Patch originally bz#1119 (senthilkumar_sen at hotpop.com),
ok djm@, grudging ok deraadt@.
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[ssh-keygen.1]
grammar;
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[ssh-keygen.1 ssh-keygen.c]
generate a protocol 2 RSA key by default
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[ssh-keygen.1 ssh-keygen.c sshd.8]
increase default rsa/dsa key length from 1024 to 2048 bits;
ok markus@ deraadt@
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[ssh-add.1 ssh-agent.1 ssh-keygen.1 ssh.1 ssh_config.5 sshd.8]
[sshd_config.5] OpenSSH doesn't ever look at the $HOME environment
variable, so don't say that we do (bz #623); ok deraadt@
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[ssh-keygen.1]
Correct description of -H (bz #997); ok markus@, punctuation jmc@
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[ssh-keygen.1]
sort options (no attempt made at synopsis clean up though);
spelling (occurance -> occurrence);
use prompt before examples;
grammar;
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[ssh-keygen.1]
whitespace;
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[ssh-keygen.1 ssh-keygen.c ssh_config.5]
add tools for managing known_hosts files with hashed hostnames, including
hashing existing files and deleting hosts by name; ok markus@ deraadt@
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[ssh-keygen.1]
kill whitespace at eol;
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[ssh-keygen.1 ssh.1]
improve SSHFP documentation; ok deraadt@
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[moduli.c ssh-keygen.1 ssh-keygen.c]
tidy up moduli generation debugging, add -v (verbose/debug) option to
ssh-keygen; ok markus@
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[ssh-keygen.1 ssh-keygen.c]
Support for generating Diffie-Hellman groups (/etc/moduli) from ssh-keygen.
Based on code from Phil Karn, William Allen Simpson and Niels Provos.
ok markus@, thanks jmc@
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[scp.1 sftp-server.8 ssh.1 ssh-add.1 ssh-agent.1 ssh_config.5]
[sshd.8 sshd_config.5 ssh-keygen.1 ssh-keyscan.1 ssh-keysign.8]
- section reorder
- COMPATIBILITY merge
- macro cleanup
- kill whitespace at EOL
- new sentence, new line
ssh pages ok markus@
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[ssh.1 ssh_config.5 sshd.8 sshd_config.5 ssh-keygen.1]
new sentence, new line
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[key.c key.h readconf.c readconf.h ssh_config.5 sshconnect.c]
[dns.c dns.h README.dns ssh-keygen.1 ssh-keygen.c]
add experimental support for verifying hos keys using DNS as described
in draft-ietf-secsh-dns-xx.txt. more information in README.dns.
ok markus@ and henning@
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- jmc@cvs.openbsd.org 2003/03/28 10:11:43
[scp.1 sftp.1 ssh.1 ssh-add.1 ssh-agent.1 ssh_config.5 sshd_config.5]
[ssh-keygen.1 ssh-keyscan.1 ssh-keysign.8]
- killed whitespace
- new sentence new line
- .Bk for arguments
ok markus@
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[ssh-keygen.1]
remove outdated statement; ok markus@ deraadt@
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[auth-bsdauth.c auth-skey.c auth1.c auth2-chall.c auth2-none.c authfd.c
authfd.h monitor_wrap.c msg.c nchan.c radix.c readconf.c scp.c sftp.1
ssh-add.1 ssh-add.c ssh-agent.1 ssh-agent.c ssh-keygen.1 ssh-keygen.c
ssh-keysign.c ssh.1 sshconnect.c sshconnect.h sshconnect2.c ttymodes.c
xmalloc.h]
KNF done automatically while reading....
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[ssh-keygen.1]
-t required now for key generation
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[ssh-keygen.1 ssh-keygen.c]
Remove default (rsa1) key type; ok markus@
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[ssh-keygen.1]
more on passphrase construction; ok markus@
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[ssh-keygen.1 ssh-keygen.c]
better docu for fingerprinting, ok deraadt@
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[scp.1 sftp.1 ssh.1 ssh-agent.1 sshd.8 ssh-keygen.1 ssh-keyscan.1]
avoid first person in manual pages
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[ssh-keygen.1]
document smartcard upload/download. ok markus@
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[ssh-keygen.1]
Fix typo.
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[ssh-keygen.1]
sshd(8) will never read the private keys, but ssh(1) does;
hugh@mimosa.com
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[sftp.1 sftp-server.8 ssh-keygen.1]
ok, tmac is now fixed
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[sftp.1 sftp-server.8 ssh-keygen.1]
join .%A entries; most by bk@rt.fm
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[auth2.c auth-rsa.c pathnames.h ssh.1 sshd.8 sshd_config
ssh-keygen.1]
merge authorized_keys2 into authorized_keys.
authorized_keys2 is used for backward compat.
(just append authorized_keys2 to authorized_keys).
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[ssh-keygen.1]
1-2 bits of entrophy per character (not per word), ok stevesk@
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[sftp.1 ssh-add.1 ssh-keygen.1]
typos, grammar
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[ssh-keygen.1 ssh-keygen.c]
allow public key for -e, too
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[ssh-keygen.1 ssh.1 sshd.8]
document hostbased and other cleanup
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[ssh-keygen.1 ssh-keygen.c]
style, noted by stevesk; sort flags in usage
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[ssh-keygen.1 ssh-keygen.c]
rename arguments -x -> -e (export key), -X -> -i (import key)
xref draft-ietf-secsh-publickeyfile-01.txt
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[ssh-add.1 ssh-agent.1 ssh-keygen.1 ssh.1 sshd.8]
document id_rsa{.pub,}. markus ok
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[ssh-keygen.1 ssh-keygen.c]
remove -v again. use -B instead for bubblebabble. make -B consistent
with -l and make -B work with /path/to/known_hosts. ok deraadt@
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[ssh-keygen.1 ssh-keygen.c]
print both md5, sha1 and bubblebabble fingerprints when using
ssh-keygen -l -v. ok markus@.
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