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4ba0d54794
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
74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
/* $OpenBSD: compat.h,v 1.52 2018/07/03 11:39:54 djm Exp $ */
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/*
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* Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef COMPAT_H
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#define COMPAT_H
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#define SSH_PROTO_UNKNOWN 0x00
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#define SSH_PROTO_1 0x01
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#define SSH_PROTO_1_PREFERRED 0x02
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#define SSH_PROTO_2 0x04
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#define SSH_BUG_UTF8TTYMODE 0x00000001
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#define SSH_BUG_SIGTYPE 0x00000002
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/* #define unused 0x00000004 */
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/* #define unused 0x00000008 */
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#define SSH_OLD_SESSIONID 0x00000010
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/* #define unused 0x00000020 */
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#define SSH_BUG_DEBUG 0x00000040
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/* #define unused 0x00000080 */
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#define SSH_BUG_IGNOREMSG 0x00000100
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/* #define unused 0x00000200 */
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#define SSH_BUG_PASSWORDPAD 0x00000400
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#define SSH_BUG_SCANNER 0x00000800
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#define SSH_BUG_BIGENDIANAES 0x00001000
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#define SSH_BUG_RSASIGMD5 0x00002000
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#define SSH_OLD_DHGEX 0x00004000
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#define SSH_BUG_NOREKEY 0x00008000
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/* #define unused 0x00010000 */
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/* #define unused 0x00020000 */
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/* #define unused 0x00040000 */
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/* #define unused 0x00100000 */
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#define SSH_BUG_EXTEOF 0x00200000
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#define SSH_BUG_PROBE 0x00400000
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/* #define unused 0x00800000 */
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#define SSH_OLD_FORWARD_ADDR 0x01000000
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/* #define unused 0x02000000 */
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#define SSH_NEW_OPENSSH 0x04000000
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#define SSH_BUG_DYNAMIC_RPORT 0x08000000
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#define SSH_BUG_CURVE25519PAD 0x10000000
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#define SSH_BUG_HOSTKEYS 0x20000000
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#define SSH_BUG_DHGEX_LARGE 0x40000000
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u_int compat_datafellows(const char *);
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int proto_spec(const char *);
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char *compat_cipher_proposal(char *);
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char *compat_pkalg_proposal(char *);
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char *compat_kex_proposal(char *);
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extern int datafellows;
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#endif
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