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upstream: Client-side workaround for a bug in OpenSSH 7.4: this release 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
2021-06-06 03:40:39 +00:00
/* $OpenBSD: compat.h,v 1.57 2021/06/06 03:40:39 djm Exp $ */
- stevesk@cvs.openbsd.org 2002/03/04 17:27:39 [auth-krb5.c auth-options.h auth.h authfd.h authfile.h bufaux.h buffer.h channels.h cipher.h compat.h compress.h crc32.h deattack.c getput.h groupaccess.c misc.c mpaux.h packet.h readconf.h rsa.h scard.h servconf.h ssh-agent.c ssh.h ssh2.h sshpty.h sshtty.c ttymodes.h uuencode.c xmalloc.h] $OpenBSD$ and RCSID() cleanup: don't use RCSID() in .h files; add missing RCSID() to .c files and remove dup /*$OpenBSD$*/ from .c files. ok markus@
2002-03-05 01:53:02 +00:00
- More reformatting merged from OpenBSD CVS - Merged OpenBSD CVS changes: - [channels.c] report from mrwizard@psu.edu via djm@ibs.com.au - [channels.c] set SO_REUSEADDR and SO_LINGER for forwarded ports. chip@valinux.com via damien@ibs.com.au - [nchan.c] it's not an error() if shutdown_write failes in nchan. - [readconf.c] remove dead #ifdef-0-code - [readconf.c servconf.c] strcasecmp instead of tolower - [scp.c] progress meter overflow fix from damien@ibs.com.au - [ssh-add.1 ssh-add.c] SSH_ASKPASS support - [ssh.1 ssh.c] postpone fork_after_authentication until command execution, request/patch from jahakala@cc.jyu.fi via damien@ibs.com.au plus: use daemon() for backgrounding
1999-11-25 00:54:57 +00:00
/*
- markus@cvs.openbsd.org 2001/06/25 08:25:41 [channels.c channels.h cipher.c clientloop.c compat.c compat.h hostfile.c kex.c kex.h key.c key.h nchan.c packet.c serverloop.c session.c session.h sftp-server.c ssh-add.c ssh-agent.c uuencode.h] update copyright for 2001
2001-07-04 03:32:30 +00:00
* Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
- More reformatting merged from OpenBSD CVS - Merged OpenBSD CVS changes: - [channels.c] report from mrwizard@psu.edu via djm@ibs.com.au - [channels.c] set SO_REUSEADDR and SO_LINGER for forwarded ports. chip@valinux.com via damien@ibs.com.au - [nchan.c] it's not an error() if shutdown_write failes in nchan. - [readconf.c] remove dead #ifdef-0-code - [readconf.c servconf.c] strcasecmp instead of tolower - [scp.c] progress meter overflow fix from damien@ibs.com.au - [ssh-add.1 ssh-add.c] SSH_ASKPASS support - [ssh.1 ssh.c] postpone fork_after_authentication until command execution, request/patch from jahakala@cc.jyu.fi via damien@ibs.com.au plus: use daemon() for backgrounding
1999-11-25 00:54:57 +00:00
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Initial revision
1999-10-27 03:42:43 +00:00
#ifndef COMPAT_H
#define COMPAT_H
- OpenBSD CVS updates: - [channels.c] repair x11-fwd - [sshconnect.c] fix passwd prompt for ssh2, less debugging output. - [clientloop.c compat.c dsa.c kex.c sshd.c] less debugging output - [kex.c kex.h sshconnect.c sshd.c] check for reasonable public DH values - [README.openssh2 cipher.c cipher.h compat.c compat.h readconf.c] [readconf.h servconf.c servconf.h ssh.c ssh.h sshconnect.c sshd.c] add Cipher and Protocol options to ssh/sshd, e.g.: ssh -o 'Protocol 1,2' if you prefer proto 1, ssh -o 'Ciphers arcfour,3des-cbc' - [sshd.c] print 1.99 only if server supports both
2000-04-12 10:17:38 +00:00
upstream: Don't send IUTF8 to servers that don't like them. 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
2018-02-16 04:43:11 +00:00
#define SSH_BUG_UTF8TTYMODE 0x00000001
upstream: Improve strictness and control over RSA-SHA2 signature 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
2018-07-03 11:39:54 +00:00
#define SSH_BUG_SIGTYPE 0x00000002
upstream: Client-side workaround for a bug in OpenSSH 7.4: this release 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
2021-06-06 03:40:39 +00:00
#define SSH_BUG_SIGTYPE74 0x00000004
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x00000008 */
- markus@cvs.openbsd.org 2001/04/29 19:16:52 [channels.c clientloop.c compat.c compat.h serverloop.c] more ssh.com-2.0.x bug-compat; from per@appgate.com
2001-04-29 19:52:00 +00:00
#define SSH_OLD_SESSIONID 0x00000010
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x00000020 */
- markus@cvs.openbsd.org 2001/04/29 19:16:52 [channels.c clientloop.c compat.c compat.h serverloop.c] more ssh.com-2.0.x bug-compat; from per@appgate.com
2001-04-29 19:52:00 +00:00
#define SSH_BUG_DEBUG 0x00000040
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x00000080 */
- markus@cvs.openbsd.org 2001/04/29 19:16:52 [channels.c clientloop.c compat.c compat.h serverloop.c] more ssh.com-2.0.x bug-compat; from per@appgate.com
2001-04-29 19:52:00 +00:00
#define SSH_BUG_IGNOREMSG 0x00000100
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x00000200 */
- markus@cvs.openbsd.org 2001/04/29 19:16:52 [channels.c clientloop.c compat.c compat.h serverloop.c] more ssh.com-2.0.x bug-compat; from per@appgate.com
2001-04-29 19:52:00 +00:00
#define SSH_BUG_PASSWORDPAD 0x00000400
#define SSH_BUG_SCANNER 0x00000800
#define SSH_BUG_BIGENDIANAES 0x00001000
#define SSH_BUG_RSASIGMD5 0x00002000
#define SSH_OLD_DHGEX 0x00004000
#define SSH_BUG_NOREKEY 0x00008000
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x00010000 */
/* #define unused 0x00020000 */
/* #define unused 0x00040000 */
/* #define unused 0x00100000 */
- markus@cvs.openbsd.org 2002/03/25 21:13:51 [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
2002-03-26 03:26:24 +00:00
#define SSH_BUG_EXTEOF 0x00200000
- markus@cvs.openbsd.org 2003/08/29 10:03:15 [compat.c compat.h] SSH_BUG_K5USER is unused; ok henning@
2003-09-02 12:52:00 +00:00
#define SSH_BUG_PROBE 0x00400000
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x00800000 */
- djm@cvs.openbsd.org 2005/03/01 10:09:52 [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.
2005-03-01 10:24:33 +00:00
#define SSH_OLD_FORWARD_ADDR 0x01000000
upstream commit 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
2018-01-23 05:27:21 +00:00
/* #define unused 0x02000000 */
- markus@cvs.openbsd.org 2008/09/11 14:22:37 [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@
2008-11-03 08:20:10 +00:00
#define SSH_NEW_OPENSSH 0x04000000
- markus@cvs.openbsd.org 2011/09/23 07:45:05 [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@
2011-10-02 07:59:03 +00:00
#define SSH_BUG_DYNAMIC_RPORT 0x08000000
- djm@cvs.openbsd.org 2014/04/18 23:52:25 [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@
2014-04-20 03:25:30 +00:00
#define SSH_BUG_CURVE25519PAD 0x10000000
upstream commit 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@
2015-04-10 05:16:50 +00:00
#define SSH_BUG_HOSTKEYS 0x20000000
upstream commit 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
2015-05-26 23:23:40 +00:00
#define SSH_BUG_DHGEX_LARGE 0x40000000
- OpenBSD CVS update - markus@cvs.openbsd.org [cipher.h myproposal.h readconf.c readconf.h servconf.c ssh.1 ssh.c] [ssh.h sshconnect1.c sshconnect2.c sshd.8] - complain about invalid ciphers in SSH1 (e.g. arcfour is SSH2 only) - hugh@cvs.openbsd.org [ssh.1] - zap typo [ssh-keygen.1] - One last nit fix. (markus approved) [sshd.8] - some markus certified spelling adjustments - markus@cvs.openbsd.org [auth2.c channels.c clientloop.c compat compat.h dsa.c kex.c] [sshconnect2.c ] - bug compat w/ ssh-2.0.13 x11, split out bugs [nchan.c] - no drain if ibuf_empty, fixes x11fwd problems; tests by fries@ [ssh-keygen.c] - handle escapes in real and original key format, ok millert@ [version.h] - OpenSSH-2.1
2000-05-09 01:02:59 +00:00
upstream: remove global variable used to stash compat flags and use the purpose-built ssh->compat variable instead; feedback/ok markus@ OpenBSD-Commit-ID: 7c4f200e112dae6bcf99f5bae1a5629288378a06
2021-01-27 09:26:53 +00:00
struct ssh;
- markus@cvs.openbsd.org 2001/06/26 17:27:25 [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
2001-07-04 04:46:56 +00:00
upstream: remove global variable used to stash compat flags and use the purpose-built ssh->compat variable instead; feedback/ok markus@ OpenBSD-Commit-ID: 7c4f200e112dae6bcf99f5bae1a5629288378a06
2021-01-27 09:26:53 +00:00
void compat_banner(struct ssh *, const char *);
char *compat_cipher_proposal(struct ssh *, char *);
char *compat_pkalg_proposal(struct ssh *, char *);
char *compat_kex_proposal(struct ssh *, char *);
Initial revision
1999-10-27 03:42:43 +00:00
#endif