blob: 4086e853ed6e48bb8b5973709620261a5ebc808e [file] [log] [blame]
Damien Miller5428f641999-11-25 11:54:57 +11001/*
Damien Miller4e431d42002-03-07 12:59:02 +11002 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Miller5428f641999-11-25 11:54:57 +11003 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
Damien Miller5428f641999-11-25 11:54:57 +110012 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
Damien Millerd4a8b7e1999-10-27 13:42:43 +100025#include "includes.h"
Damien Millerf91ee4c2005-03-01 21:24:33 +110026RCSID("$OpenBSD: compat.c,v 1.71 2005/03/01 10:09:52 djm Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
Damien Miller0e3b8722002-01-22 23:26:38 +110028#include "buffer.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000029#include "packet.h"
30#include "xmalloc.h"
31#include "compat.h"
32#include "log.h"
Ben Lindstrom9eab2622001-12-06 18:06:05 +000033#include "match.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000034
Damien Miller95def091999-11-25 00:26:21 +110035int compat13 = 0;
Damien Miller33b13562000-04-04 14:38:59 +100036int compat20 = 0;
37int datafellows = 0;
Damien Miller95def091999-11-25 00:26:21 +110038
Damien Miller4af51302000-04-16 11:18:38 +100039void
Damien Miller33b13562000-04-04 14:38:59 +100040enable_compat20(void)
41{
Damien Millera0e45592002-09-22 01:25:35 +100042 debug("Enabling compatibility mode for protocol 2.0");
Damien Miller1383bd82000-04-06 12:32:37 +100043 compat20 = 1;
Damien Miller33b13562000-04-04 14:38:59 +100044}
Damien Miller4af51302000-04-16 11:18:38 +100045void
Damien Miller95def091999-11-25 00:26:21 +110046enable_compat13(void)
47{
Damien Millera0e45592002-09-22 01:25:35 +100048 debug("Enabling compatibility mode for protocol 1.3");
Damien Miller95def091999-11-25 00:26:21 +110049 compat13 = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100050}
Damien Miller33b13562000-04-04 14:38:59 +100051/* datafellows bug compatibility */
52void
53compat_datafellows(const char *version)
54{
Ben Lindstrom9eab2622001-12-06 18:06:05 +000055 int i;
Damien Miller874d77b2000-10-14 16:23:11 +110056 static struct {
57 char *pat;
Damien Miller30c3d422000-05-09 11:02:59 +100058 int bugs;
59 } check[] = {
Ben Lindstrom9eab2622001-12-06 18:06:05 +000060 { "OpenSSH-2.0*,"
61 "OpenSSH-2.1*,"
62 "OpenSSH_2.1*,"
63 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
Ben Lindstromcf159442002-03-26 03:26:24 +000064 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
Damien Millerf91ee4c2005-03-01 21:24:33 +110065 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000066 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
Ben Lindstromcf159442002-03-26 03:26:24 +000067 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
Damien Millerf91ee4c2005-03-01 21:24:33 +110068 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000069 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
Damien Millerf91ee4c2005-03-01 21:24:33 +110070 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
71 SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000072 { "OpenSSH_2.5.0p1*,"
73 "OpenSSH_2.5.1p1*",
Ben Lindstroma8baf362001-04-05 23:28:36 +000074 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
Damien Millerf91ee4c2005-03-01 21:24:33 +110075 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
76 SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000077 { "OpenSSH_2.5.0*,"
78 "OpenSSH_2.5.1*,"
Ben Lindstromcf159442002-03-26 03:26:24 +000079 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
Damien Millerf91ee4c2005-03-01 21:24:33 +110080 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
81 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
82 SSH_OLD_FORWARD_ADDR},
Ben Lindstromcf159442002-03-26 03:26:24 +000083 { "OpenSSH_2.*,"
84 "OpenSSH_3.0*,"
Damien Millerf91ee4c2005-03-01 21:24:33 +110085 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
86 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
Ben Lindstromcf159442002-03-26 03:26:24 +000087 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000088 { "OpenSSH*", 0 },
89 { "*MindTerm*", 0 },
90 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstrom60a43812001-03-29 00:32:56 +000091 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Damien Millerd3209042003-04-01 21:44:37 +100092 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
93 SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +000094 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstrom60a43812001-03-29 00:32:56 +000095 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Damien Millerd3209042003-04-01 21:44:37 +100096 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
97 SSH_BUG_FIRSTKEX },
Damien Miller9f0f5c62001-12-21 14:45:46 +110098 { "2.0.13*,"
99 "2.0.14*,"
100 "2.0.15*,"
101 "2.0.16*,"
102 "2.0.17*,"
103 "2.0.18*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000104 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +0000105 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000106 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
Ben Lindstrom671388f2001-04-19 20:40:45 +0000107 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
Ben Lindstromf558cf62001-09-20 23:13:49 +0000108 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
Damien Millerd3209042003-04-01 21:44:37 +1000109 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
Damien Miller9f0f5c62001-12-21 14:45:46 +1100110 { "2.0.11*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000111 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +0000112 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
113 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
Ben Lindstrom60a43812001-03-29 00:32:56 +0000114 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
Ben Lindstromf558cf62001-09-20 23:13:49 +0000115 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
Damien Millerd3209042003-04-01 21:44:37 +1000116 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000117 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstrom8c963922001-04-30 23:06:57 +0000118 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
119 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
120 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
121 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
Damien Millerd3209042003-04-01 21:44:37 +1000122 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
123 SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000124 { "2.2.0*,"
125 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
Damien Millerd3209042003-04-01 21:44:37 +1000126 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
127 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
128 SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000129 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
Damien Millerd3209042003-04-01 21:44:37 +1000130 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000131 { "3.0.*", SSH_BUG_DEBUG },
132 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
133 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
134 { "1.2.18*,"
135 "1.2.19*,"
136 "1.2.20*,"
137 "1.2.21*,"
Damien Miller7630ee22003-09-02 22:52:00 +1000138 "1.2.22*", SSH_BUG_IGNOREMSG },
Ben Lindstromc8226382002-04-10 16:22:09 +0000139 { "1.3.2*", /* F-Secure */
Damien Miller7630ee22003-09-02 22:52:00 +1000140 SSH_BUG_IGNOREMSG },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000141 { "*SSH Compatible Server*", /* Netscreen */
Ben Lindstromd20d0f32001-03-10 17:22:20 +0000142 SSH_BUG_PASSWORDPAD },
Damien Miller9f0f5c62001-12-21 14:45:46 +1100143 { "*OSU_0*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000144 "OSU_1.0*,"
145 "OSU_1.1*,"
146 "OSU_1.2*,"
147 "OSU_1.3*,"
148 "OSU_1.4*,"
149 "OSU_1.5alpha1*,"
150 "OSU_1.5alpha2*,"
151 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
152 { "*SSH_Version_Mapper*",
Damien Miller27dbe6f2001-03-19 22:36:20 +1100153 SSH_BUG_SCANNER },
Damien Millere9264972002-09-30 11:59:21 +1000154 { "Probe-*",
155 SSH_BUG_PROBE },
Damien Miller50a41ed2000-10-16 12:14:42 +1100156 { NULL, 0 }
Damien Miller33b13562000-04-04 14:38:59 +1000157 };
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000158
Damien Millercaf6dd62000-08-29 11:33:50 +1100159 /* process table, return first match */
Damien Miller874d77b2000-10-14 16:23:11 +1100160 for (i = 0; check[i].pat; i++) {
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000161 if (match_pattern_list(version, check[i].pat,
162 strlen(check[i].pat), 0) == 1) {
Ben Lindstrom971c9732000-12-10 02:01:50 +0000163 debug("match: %s pat %s", version, check[i].pat);
Damien Miller30c3d422000-05-09 11:02:59 +1000164 datafellows = check[i].bugs;
Damien Miller33b13562000-04-04 14:38:59 +1000165 return;
166 }
167 }
Damien Miller874d77b2000-10-14 16:23:11 +1100168 debug("no match: %s", version);
Damien Miller33b13562000-04-04 14:38:59 +1000169}
Damien Miller78928792000-04-12 20:17:38 +1000170
171#define SEP ","
172int
173proto_spec(const char *spec)
174{
Damien Miller37023962000-07-11 17:31:38 +1000175 char *s, *p, *q;
Damien Miller78928792000-04-12 20:17:38 +1000176 int ret = SSH_PROTO_UNKNOWN;
177
Damien Millerb1715dc2000-05-30 13:44:51 +1000178 if (spec == NULL)
179 return ret;
Damien Miller37023962000-07-11 17:31:38 +1000180 q = s = xstrdup(spec);
181 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000182 switch (atoi(p)) {
Damien Miller78928792000-04-12 20:17:38 +1000183 case 1:
184 if (ret == SSH_PROTO_UNKNOWN)
185 ret |= SSH_PROTO_1_PREFERRED;
186 ret |= SSH_PROTO_1;
187 break;
188 case 2:
189 ret |= SSH_PROTO_2;
190 break;
191 default:
Damien Miller996acd22003-04-09 20:59:48 +1000192 logit("ignoring bad proto spec: '%s'.", p);
Damien Miller78928792000-04-12 20:17:38 +1000193 break;
194 }
195 }
196 xfree(s);
197 return ret;
198}
Ben Lindstromc8530c72001-03-24 00:35:19 +0000199
200char *
201compat_cipher_proposal(char *cipher_prop)
202{
Damien Miller0e3b8722002-01-22 23:26:38 +1100203 Buffer b;
Ben Lindstromc8530c72001-03-24 00:35:19 +0000204 char *orig_prop, *fix_ciphers;
205 char *cp, *tmp;
Ben Lindstromc8530c72001-03-24 00:35:19 +0000206
207 if (!(datafellows & SSH_BUG_BIGENDIANAES))
208 return(cipher_prop);
209
Damien Miller0e3b8722002-01-22 23:26:38 +1100210 buffer_init(&b);
Ben Lindstromc8530c72001-03-24 00:35:19 +0000211 tmp = orig_prop = xstrdup(cipher_prop);
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000212 while ((cp = strsep(&tmp, ",")) != NULL) {
Damien Miller914bef42002-01-22 23:34:35 +1100213 if (strncmp(cp, "aes", 3) != 0) {
Damien Miller0e3b8722002-01-22 23:26:38 +1100214 if (buffer_len(&b) > 0)
215 buffer_append(&b, ",", 1);
216 buffer_append(&b, cp, strlen(cp));
Ben Lindstromc8530c72001-03-24 00:35:19 +0000217 }
218 }
Damien Miller0e3b8722002-01-22 23:26:38 +1100219 buffer_append(&b, "\0", 1);
220 fix_ciphers = xstrdup(buffer_ptr(&b));
221 buffer_free(&b);
Ben Lindstromc8530c72001-03-24 00:35:19 +0000222 xfree(orig_prop);
223 debug2("Original cipher proposal: %s", cipher_prop);
224 debug2("Compat cipher proposal: %s", fix_ciphers);
225 if (!*fix_ciphers)
226 fatal("No available ciphers found.");
227
228 return(fix_ciphers);
229}