Damien Miller | 0e6b674 | 2014-04-20 13:27:01 +1000 | [diff] [blame] | 1 | /* $OpenBSD: compat.c,v 1.84 2014/04/19 05:54:59 djm Exp $ */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2 | /* |
Damien Miller | 4e431d4 | 2002-03-07 12:59:02 +1100 | [diff] [blame] | 3 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | */ |
| 25 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 26 | #include "includes.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 28 | #include <sys/types.h> |
| 29 | |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 30 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 31 | #include <string.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 32 | #include <stdarg.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 33 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 34 | #include "xmalloc.h" |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 35 | #include "buffer.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 36 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 37 | #include "compat.h" |
| 38 | #include "log.h" |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 39 | #include "match.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 40 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 41 | int compat13 = 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 42 | int compat20 = 0; |
| 43 | int datafellows = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 44 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 45 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 46 | enable_compat20(void) |
| 47 | { |
Darren Tucker | 00c1518 | 2012-09-06 21:21:56 +1000 | [diff] [blame] | 48 | if (compat20) |
| 49 | return; |
Damien Miller | a0e4559 | 2002-09-22 01:25:35 +1000 | [diff] [blame] | 50 | debug("Enabling compatibility mode for protocol 2.0"); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 51 | compat20 = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 52 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 53 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 54 | enable_compat13(void) |
| 55 | { |
Damien Miller | a0e4559 | 2002-09-22 01:25:35 +1000 | [diff] [blame] | 56 | debug("Enabling compatibility mode for protocol 1.3"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 57 | compat13 = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 59 | /* datafellows bug compatibility */ |
| 60 | void |
| 61 | compat_datafellows(const char *version) |
| 62 | { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 63 | int i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 64 | static struct { |
| 65 | char *pat; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 66 | int bugs; |
| 67 | } check[] = { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 68 | { "OpenSSH-2.0*," |
| 69 | "OpenSSH-2.1*," |
| 70 | "OpenSSH_2.1*," |
| 71 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 72 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 73 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 74 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 75 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 76 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 77 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 78 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
| 79 | SSH_OLD_FORWARD_ADDR}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 80 | { "OpenSSH_2.5.0p1*," |
| 81 | "OpenSSH_2.5.1p1*", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 82 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 83 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
| 84 | SSH_OLD_FORWARD_ADDR}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 85 | { "OpenSSH_2.5.0*," |
| 86 | "OpenSSH_2.5.1*," |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 87 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 88 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
| 89 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
| 90 | SSH_OLD_FORWARD_ADDR}, |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 91 | { "OpenSSH_2.*," |
| 92 | "OpenSSH_3.0*," |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 93 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
| 94 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 95 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
Damien Miller | 456e6f0 | 2008-11-03 19:20:10 +1100 | [diff] [blame] | 96 | { "OpenSSH_4*", 0 }, |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 97 | { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT}, |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 98 | { "OpenSSH_6.5*," |
Damien Miller | 0e6b674 | 2014-04-20 13:27:01 +1000 | [diff] [blame] | 99 | "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD}, |
Damien Miller | 456e6f0 | 2008-11-03 19:20:10 +1100 | [diff] [blame] | 100 | { "OpenSSH*", SSH_NEW_OPENSSH }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 101 | { "*MindTerm*", 0 }, |
| 102 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 103 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Damien Miller | d320904 | 2003-04-01 21:44:37 +1000 | [diff] [blame] | 104 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
| 105 | SSH_BUG_FIRSTKEX }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 106 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 107 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Damien Miller | d320904 | 2003-04-01 21:44:37 +1000 | [diff] [blame] | 108 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
| 109 | SSH_BUG_FIRSTKEX }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 110 | { "2.0.13*," |
| 111 | "2.0.14*," |
| 112 | "2.0.15*," |
| 113 | "2.0.16*," |
| 114 | "2.0.17*," |
| 115 | "2.0.18*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 116 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 117 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 118 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 119 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 120 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| |
Damien Miller | d320904 | 2003-04-01 21:44:37 +1000 | [diff] [blame] | 121 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 122 | { "2.0.11*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 123 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 124 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 125 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 126 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 127 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
Damien Miller | d320904 | 2003-04-01 21:44:37 +1000 | [diff] [blame] | 128 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 129 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 8c96392 | 2001-04-30 23:06:57 +0000 | [diff] [blame] | 130 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 131 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
| 132 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
| 133 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
Damien Miller | d320904 | 2003-04-01 21:44:37 +1000 | [diff] [blame] | 134 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| |
| 135 | SSH_BUG_FIRSTKEX }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 136 | { "2.2.0*," |
| 137 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| |
Damien Miller | d320904 | 2003-04-01 21:44:37 +1000 | [diff] [blame] | 138 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, |
| 139 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| |
| 140 | SSH_BUG_FIRSTKEX }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 141 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
Damien Miller | 1ec4626 | 2007-01-05 16:26:45 +1100 | [diff] [blame] | 142 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX| |
| 143 | SSH_BUG_RFWD_ADDR }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 144 | { "3.0.*", SSH_BUG_DEBUG }, |
| 145 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, |
| 146 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, |
| 147 | { "1.2.18*," |
| 148 | "1.2.19*," |
| 149 | "1.2.20*," |
| 150 | "1.2.21*," |
Damien Miller | 7630ee2 | 2003-09-02 22:52:00 +1000 | [diff] [blame] | 151 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
Ben Lindstrom | c822638 | 2002-04-10 16:22:09 +0000 | [diff] [blame] | 152 | { "1.3.2*", /* F-Secure */ |
Damien Miller | 7630ee2 | 2003-09-02 22:52:00 +1000 | [diff] [blame] | 153 | SSH_BUG_IGNOREMSG }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 154 | { "*SSH Compatible Server*", /* Netscreen */ |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 155 | SSH_BUG_PASSWORDPAD }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 156 | { "*OSU_0*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 157 | "OSU_1.0*," |
| 158 | "OSU_1.1*," |
| 159 | "OSU_1.2*," |
| 160 | "OSU_1.3*," |
| 161 | "OSU_1.4*," |
| 162 | "OSU_1.5alpha1*," |
| 163 | "OSU_1.5alpha2*," |
| 164 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, |
| 165 | { "*SSH_Version_Mapper*", |
Damien Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 166 | SSH_BUG_SCANNER }, |
Damien Miller | e926497 | 2002-09-30 11:59:21 +1000 | [diff] [blame] | 167 | { "Probe-*", |
| 168 | SSH_BUG_PROBE }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 169 | { NULL, 0 } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 170 | }; |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 171 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 172 | /* process table, return first match */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 173 | for (i = 0; check[i].pat; i++) { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 174 | if (match_pattern_list(version, check[i].pat, |
| 175 | strlen(check[i].pat), 0) == 1) { |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 176 | datafellows = check[i].bugs; |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 177 | debug("match: %s pat %s compat 0x%08x", |
| 178 | version, check[i].pat, datafellows); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 179 | return; |
| 180 | } |
| 181 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 182 | debug("no match: %s", version); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 183 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 184 | |
| 185 | #define SEP "," |
| 186 | int |
| 187 | proto_spec(const char *spec) |
| 188 | { |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 189 | char *s, *p, *q; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 190 | int ret = SSH_PROTO_UNKNOWN; |
| 191 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 192 | if (spec == NULL) |
| 193 | return ret; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 194 | q = s = xstrdup(spec); |
| 195 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 196 | switch (atoi(p)) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 197 | case 1: |
| 198 | if (ret == SSH_PROTO_UNKNOWN) |
| 199 | ret |= SSH_PROTO_1_PREFERRED; |
| 200 | ret |= SSH_PROTO_1; |
| 201 | break; |
| 202 | case 2: |
| 203 | ret |= SSH_PROTO_2; |
| 204 | break; |
| 205 | default: |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 206 | logit("ignoring bad proto spec: '%s'.", p); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 207 | break; |
| 208 | } |
| 209 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 210 | free(s); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 211 | return ret; |
| 212 | } |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 213 | |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 214 | /* |
| 215 | * Filters a proposal string, excluding any algorithm matching the 'filter' |
| 216 | * pattern list. |
| 217 | */ |
| 218 | static char * |
| 219 | filter_proposal(char *proposal, const char *filter) |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 220 | { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 221 | Buffer b; |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 222 | char *orig_prop, *fix_prop; |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 223 | char *cp, *tmp; |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 224 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 225 | buffer_init(&b); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 226 | tmp = orig_prop = xstrdup(proposal); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 227 | while ((cp = strsep(&tmp, ",")) != NULL) { |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 228 | if (match_pattern_list(cp, filter, strlen(cp), 0) != 1) { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 229 | if (buffer_len(&b) > 0) |
| 230 | buffer_append(&b, ",", 1); |
| 231 | buffer_append(&b, cp, strlen(cp)); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 232 | } else |
| 233 | debug2("Compat: skipping algorithm \"%s\"", cp); |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 234 | } |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 235 | buffer_append(&b, "\0", 1); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 236 | fix_prop = xstrdup(buffer_ptr(&b)); |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 237 | buffer_free(&b); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 238 | free(orig_prop); |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 239 | |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 240 | return fix_prop; |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 241 | } |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 242 | |
| 243 | char * |
| 244 | compat_cipher_proposal(char *cipher_prop) |
| 245 | { |
| 246 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) |
| 247 | return cipher_prop; |
| 248 | debug2("%s: original cipher proposal: %s", __func__, cipher_prop); |
| 249 | cipher_prop = filter_proposal(cipher_prop, "aes*"); |
| 250 | debug2("%s: compat cipher proposal: %s", __func__, cipher_prop); |
| 251 | if (*cipher_prop == '\0') |
| 252 | fatal("No supported ciphers found"); |
| 253 | return cipher_prop; |
| 254 | } |
| 255 | |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 256 | char * |
| 257 | compat_pkalg_proposal(char *pkalg_prop) |
| 258 | { |
| 259 | if (!(datafellows & SSH_BUG_RSASIGMD5)) |
| 260 | return pkalg_prop; |
| 261 | debug2("%s: original public key proposal: %s", __func__, pkalg_prop); |
| 262 | pkalg_prop = filter_proposal(pkalg_prop, "ssh-rsa"); |
| 263 | debug2("%s: compat public key proposal: %s", __func__, pkalg_prop); |
| 264 | if (*pkalg_prop == '\0') |
| 265 | fatal("No supported PK algorithms found"); |
| 266 | return pkalg_prop; |
| 267 | } |
| 268 | |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 269 | char * |
| 270 | compat_kex_proposal(char *kex_prop) |
| 271 | { |
| 272 | if (!(datafellows & SSH_BUG_CURVE25519PAD)) |
| 273 | return kex_prop; |
| 274 | debug2("%s: original KEX proposal: %s", __func__, kex_prop); |
| 275 | kex_prop = filter_proposal(kex_prop, "curve25519-sha256@libssh.org"); |
| 276 | debug2("%s: compat KEX proposal: %s", __func__, kex_prop); |
| 277 | if (*kex_prop == '\0') |
| 278 | fatal("No supported key exchange algorithms found"); |
| 279 | return kex_prop; |
| 280 | } |
| 281 | |