allows RSA/SHA2 signatures for public key authentication but fails to
advertise this correctly via SSH2_MSG_EXT_INFO. This causes clients of these
server to incorrectly match PubkeyAcceptedAlgorithms and potentially refuse
to offer valid keys.
Reported by and based on patch from Gordon Messmer via bz3213, thanks
also for additional analysis by Jakub Jelen. ok dtucker
OpenBSD-Commit-ID: d6d0b7351d5d44c45f3daaa26efac65847a564f7
causes double-free under some circumstances.
--
date: 2018/07/31 03:07:24; author: djm; state: Exp; lines: +33 -18; commitid: f7g4UI8eeOXReTPh;
fix some memory leaks spotted by Coverity via Jakub Jelen in bz#2366
feedback and ok dtucker@
OpenBSD-Commit-ID: 1e77547f60fdb5e2ffe23e2e4733c54d8d2d1137
In ssh, when an agent fails to return a RSA-SHA2 signature when
requested and falls back to RSA-SHA1 instead, retry the signature to
ensure that the public key algorithm sent in the SSH_MSG_USERAUTH
matches the one in the signature itself.
In sshd, strictly enforce that the public key algorithm sent in the
SSH_MSG_USERAUTH message matches what appears in the signature.
Make the sshd_config PubkeyAcceptedKeyTypes and
HostbasedAcceptedKeyTypes options control accepted signature algorithms
(previously they selected supported key types). This allows these
options to ban RSA-SHA1 in favour of RSA-SHA2.
Add new signature algorithms "rsa-sha2-256-cert-v01@openssh.com" and
"rsa-sha2-512-cert-v01@openssh.com" to force use of RSA-SHA2 signatures
with certificate keys.
feedback and ok markus@
OpenBSD-Commit-ID: c6e9f6d45eed8962ad502d315d7eaef32c419dde
Some SSH servers eg "ConfD" drop the connection if the client sends the
new IUTF8 (RFC8160) terminal mode even if it's not set. Add a bug bit
for such servers and avoid sending IUTF8 to them. ok djm@
OpenBSD-Commit-ID: 26425855402d870c3c0a90491e72e2a8a342ceda
Drop compatibility hacks for some ancient SSH
implementations, including ssh.com <=2.* and OpenSSH <= 3.*.
These versions were all released in or before 2001 and predate the
final SSH RFCs. The hacks in question aren't necessary for RFC-
compliant SSH implementations.
ok markus@
OpenBSD-Commit-ID: 4be81c67db57647f907f4e881fb9341448606138
Cap DH-GEX group size at 4kbits for Cisco implementations.
Some of them will choke when asked for preferred sizes >4k instead of
returning the 4k group that they do have. bz#2209, ok djm@
Upstream-ID: 54b863a19713446b7431f9d06ad0532b4fcfef8d
Don't send hostkey advertisments
(hostkeys-00@openssh.com) to current versions of Tera Term as they can't
handle them. Newer versions should be OK. Patch from Bryan Drewery and
IWAMOTO Kouichi, ok djm@
[compat.c compat.h sshconnect2.c sshd.c version.h]
OpenSSH 6.5 and 6.6 have a bug that causes ~0.2% of connections
using the curve25519-sha256@libssh.org KEX exchange method to fail
when connecting with something that implements the spec properly.
Disable this KEX method when speaking to one of the affected
versions.
reported by Aris Adamantiadis; ok markus@
[auth2-hostbased.c auth2-pubkey.c compat.c compat.h ssh-rsa.c]
[sshconnect.c sshconnect2.c sshd.c]
refuse RSA keys from old proprietary clients/servers that use the
obsolete RSA+MD5 signature scheme. it will still be possible to connect
with these clients/servers but only DSA keys will be accepted, and we'll
deprecate them entirely in a future release. ok markus@
[mux.c readconf.h channels.h compat.h compat.c ssh.c readconf.c channels.c version.h]
unbreak remote portforwarding with dynamic allocated listen ports:
1) send the actual listen port in the open message (instead of 0).
this allows multiple forwardings with a dynamic listen port
2) update the matching permit-open entry, so we can identify where
to connect to
report: den at skbkontur.ru and P. Szczygielski
feedback and ok djm@
[compat.c compat.h nchan.c ssh.c]
only send eow and no-more-sessions requests to openssh 5 and newer;
fixes interop problems with broken ssh v2 implementations; ok djm@
[channels.c compat.c compat.h]
bz #1019: some ssh.com versions apparently can't cope with the
remote port forwarding bind_address being a hostname, so send
them an address for cases where they are not explicitly
specified (wildcard or localhost bind). reported by daveroth AT
acm.org; ok dtucker@ deraadt@
[auth-options.c channels.c channels.h clientloop.c compat.c compat.h]
[misc.c misc.h readconf.c readconf.h servconf.c ssh.1 ssh.c ssh_config.5]
[sshd_config.5]
bz#413: allow optional specification of bind address for port forwardings.
Patch originally by Dan Astorian, but worked on by several people
Adds GatewayPorts=clientspecified option on server to allow remote
forwards to bind to client-specified ports.
[auth2.c auth2-gss.c auth.h compat.c compat.h gss-genr.c gss-serv-krb5.c
gss-serv.c monitor.c monitor.h monitor_wrap.c monitor_wrap.h readconf.c
readconf.h servconf.c servconf.h session.c session.h ssh-gss.h
ssh_config.5 sshconnect2.c sshd_config sshd_config.5]
support GSS API user authentication; patches from Simon Wilkinson,
stripped down and tested by Jakob and myself.
- mickey@cvs.openbsd.org 2002/09/27 10:42:09
[compat.c compat.h sshd.c]
add a generic match for a prober, such as sie big brother;
idea from stevesk@; markus@ ok
[auth1.c compat.c compat.h]
strip '@' from username only for KerbV and known broken clients, bug #204
Don't mind me.. I just commited a changelog with no patch. <sigh>
[channels.c channels.h compat.c compat.h nchan.c]
don't send stderr data after EOF, accept this from older known (broken)
sshd servers only, fixes http://bugzilla.mindrot.org/show_bug.cgi?id=179
[compat.c compat.h dh.c dh.h ssh2.h sshconnect2.c sshd.c version.h]
make dh group exchange more flexible, allow min and max group size,
okay markus@, deraadt@
[compat.c compat.h readconf.h ssh.c sshconnect1.c sshconnect2.c]
implement client side of SSH2_MSG_USERAUTH_PK_OK (test public key ->
no need to do enter passphrase or do expensive sign operations if the
server does not accept key).
- markus@cvs.openbsd.org 2001/01/08 22:29:05
[auth2.c compat.c compat.h servconf.c servconf.h sshd.8
sshd_config version.h]
implement option 'Banner /etc/issue.net' for ssh2, move version to
2.3.1 (needed for bugcompat detection, 2.3.0 would fail if Banner
is enabled).
- markus@cvs.openbsd.org 2001/01/08 22:03:23
[channels.c ssh-keyscan.c]
O_NDELAY -> O_NONBLOCK; thanks stevesk@pobox.com
- markus@cvs.openbsd.org 2001/01/08 21:55:41
[sshconnect1.c]
more cleanups and fixes from stevesk@pobox.com:
1) try_agent_authentication() for loop will overwrite key just
allocated with key_new(); don't alloc
2) call ssh_close_authentication_connection() before exit
try_agent_authentication()
3) free mem on bad passphrase in try_rsa_authentication()
- markus@cvs.openbsd.org 2001/01/08 21:48:17
[kex.c]
missing free; thanks stevesk@pobox.com
- (bal) More C functions defined in NeXT that are unaccessable without
defining -POSIX.
- (bal) OpenBSD CVS updates:
- markus@cvs.openbsd.org 2000/12/03 11:29:04
[compat.c]
remove fallback to SSH_BUG_HMAC now that the drafts are updated
- markus@cvs.openbsd.org 2000/12/03 11:27:55
[compat.c]
correctly match "2.1.0.pl2 SSH" etc; from pekkas@netcore.fi/bugzilla.redhat
- markus@cvs.openbsd.org 2000/12/03 11:15:03
[auth2.c compat.c compat.h sshconnect2.c]
support f-secure/ssh.com 2.0.12; ok niels@
- markus@cvs.openbsd.org 2000/10/14 04:01:15
[cipher.c]
debug3
- markus@cvs.openbsd.org 2000/10/14 04:07:23
[scp.c]
remove spaces from arguments; from djm@mindrot.org
- markus@cvs.openbsd.org 2000/10/14 06:09:46
[ssh.1]
Cipher is for SSH-1 only
- markus@cvs.openbsd.org 2000/10/14 06:12:09
[servconf.c servconf.h serverloop.c session.c sshd.8]
AllowTcpForwarding; from naddy@
- markus@cvs.openbsd.org 2000/10/14 06:16:56
[auth2.c compat.c compat.h sshconnect2.c version.h]
OpenSSH_2.3; note that is is not complete, but the version number
needs to be changed for interoperability reasons
- markus@cvs.openbsd.org 2000/10/14 06:19:45
[auth-rsa.c]
do not send RSA challenge if key is not allowed by key-options; from
eivind@ThinkSec.com
- markus@cvs.openbsd.org 2000/10/15 08:14:01
[rijndael.c session.c]
typos; from stevesk@sweden.hp.com
- markus@cvs.openbsd.org 2000/10/15 08:18:31
[rijndael.c]
typo
- Copy manpages back over from OpenBSD - too tedious to wade through diffs
- markus@cvs.openbsd.org 2000/09/05 02:59:57
[session.c]
print hostname (not hushlogin)
- markus@cvs.openbsd.org 2000/09/05 13:18:48
[authfile.c ssh-add.c]
enable ssh-add -d for DSA keys
- markus@cvs.openbsd.org 2000/09/05 13:20:49
[sftp-server.c]
cleanup
- markus@cvs.openbsd.org 2000/09/06 03:46:41
[authfile.h]
prototype
- deraadt@cvs.openbsd.org 2000/09/07 14:27:56
[ALL]
cleanup copyright notices on all files. I have attempted to be
accurate with the details. everything is now under Tatu's licence
(which I copied from his readme), and/or the core-sdi bsd-ish thing
for deattack, or various openbsd developers under a 2-term bsd
licence. We're not changing any rules, just being accurate.
- markus@cvs.openbsd.org 2000/09/07 14:40:30
[channels.c channels.h clientloop.c serverloop.c ssh.c]
cleanup window and packet sizes for ssh2 flow control; ok niels
- markus@cvs.openbsd.org 2000/09/07 14:53:00
[scp.c]
typo
- markus@cvs.openbsd.org 2000/09/07 15:13:37
[auth-options.c auth-options.h auth-rh-rsa.c auth-rsa.c auth.c]
[authfile.h canohost.c channels.h compat.c hostfile.h log.c match.h]
[pty.c readconf.c]
some more Copyright fixes
- markus@cvs.openbsd.org 2000/09/08 03:02:51
[README.openssh2]
bye bye
- deraadt@cvs.openbsd.org 2000/09/11 18:38:33
[LICENCE cipher.c]
a few more comments about it being ARC4 not RC4
- markus@cvs.openbsd.org 2000/09/12 14:53:11
[log-client.c log-server.c log.c ssh.1 ssh.c ssh.h sshd.8 sshd.c]
multiple debug levels
- markus@cvs.openbsd.org 2000/09/14 14:25:15
[clientloop.c]
typo
- deraadt@cvs.openbsd.org 2000/09/15 01:13:51
[ssh-agent.c]
check return value for setenv(3) for failure, and deal appropriately
djm@openbsd.org
dtucker@openbsd.org
markus@openbsd.org
Damien Miller
Darren Tucker
Ben Lindstrom