blob: f680f4fe3122ae8be79297eb412d09d5263edd19 [file] [log] [blame]
Darren Tucker00c15182012-09-06 21:21:56 +10001/* $OpenBSD: compat.c,v 1.80 2012/08/17 01:30:00 djm Exp $ */
Damien Miller5428f641999-11-25 11:54:57 +11002/*
Damien Miller4e431d42002-03-07 12:59:02 +11003 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Miller5428f641999-11-25 11:54:57 +11004 *
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 Miller5428f641999-11-25 11:54:57 +110013 *
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 Millerd4a8b7e1999-10-27 13:42:43 +100026#include "includes.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
Damien Millerd7834352006-08-05 12:39:39 +100028#include <sys/types.h>
29
Damien Millere7a1e5c2006-08-05 11:34:19 +100030#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100031#include <string.h>
Damien Millerd7834352006-08-05 12:39:39 +100032#include <stdarg.h>
Damien Millere3476ed2006-07-24 14:13:33 +100033
Damien Millerd7834352006-08-05 12:39:39 +100034#include "xmalloc.h"
Damien Miller0e3b8722002-01-22 23:26:38 +110035#include "buffer.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000036#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000037#include "compat.h"
38#include "log.h"
Ben Lindstrom9eab2622001-12-06 18:06:05 +000039#include "match.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000040
Damien Miller95def091999-11-25 00:26:21 +110041int compat13 = 0;
Damien Miller33b13562000-04-04 14:38:59 +100042int compat20 = 0;
43int datafellows = 0;
Damien Miller95def091999-11-25 00:26:21 +110044
Damien Miller4af51302000-04-16 11:18:38 +100045void
Damien Miller33b13562000-04-04 14:38:59 +100046enable_compat20(void)
47{
Darren Tucker00c15182012-09-06 21:21:56 +100048 if (compat20)
49 return;
Damien Millera0e45592002-09-22 01:25:35 +100050 debug("Enabling compatibility mode for protocol 2.0");
Damien Miller1383bd82000-04-06 12:32:37 +100051 compat20 = 1;
Damien Miller33b13562000-04-04 14:38:59 +100052}
Damien Miller4af51302000-04-16 11:18:38 +100053void
Damien Miller95def091999-11-25 00:26:21 +110054enable_compat13(void)
55{
Damien Millera0e45592002-09-22 01:25:35 +100056 debug("Enabling compatibility mode for protocol 1.3");
Damien Miller95def091999-11-25 00:26:21 +110057 compat13 = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058}
Damien Miller33b13562000-04-04 14:38:59 +100059/* datafellows bug compatibility */
60void
61compat_datafellows(const char *version)
62{
Ben Lindstrom9eab2622001-12-06 18:06:05 +000063 int i;
Damien Miller874d77b2000-10-14 16:23:11 +110064 static struct {
65 char *pat;
Damien Miller30c3d422000-05-09 11:02:59 +100066 int bugs;
67 } check[] = {
Ben Lindstrom9eab2622001-12-06 18:06:05 +000068 { "OpenSSH-2.0*,"
69 "OpenSSH-2.1*,"
70 "OpenSSH_2.1*,"
71 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
Ben Lindstromcf159442002-03-26 03:26:24 +000072 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
Damien Millerf91ee4c2005-03-01 21:24:33 +110073 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000074 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
Ben Lindstromcf159442002-03-26 03:26:24 +000075 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
Damien Millerf91ee4c2005-03-01 21:24:33 +110076 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000077 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
Damien Millerf91ee4c2005-03-01 21:24:33 +110078 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
79 SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000080 { "OpenSSH_2.5.0p1*,"
81 "OpenSSH_2.5.1p1*",
Ben Lindstroma8baf362001-04-05 23:28:36 +000082 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
Damien Millerf91ee4c2005-03-01 21:24:33 +110083 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
84 SSH_OLD_FORWARD_ADDR},
Ben Lindstrom9eab2622001-12-06 18:06:05 +000085 { "OpenSSH_2.5.0*,"
86 "OpenSSH_2.5.1*,"
Ben Lindstromcf159442002-03-26 03:26:24 +000087 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
Damien Millerf91ee4c2005-03-01 21:24:33 +110088 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
89 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
90 SSH_OLD_FORWARD_ADDR},
Ben Lindstromcf159442002-03-26 03:26:24 +000091 { "OpenSSH_2.*,"
92 "OpenSSH_3.0*,"
Damien Millerf91ee4c2005-03-01 21:24:33 +110093 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
94 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
Ben Lindstromcf159442002-03-26 03:26:24 +000095 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
Damien Miller456e6f02008-11-03 19:20:10 +110096 { "OpenSSH_4*", 0 },
Darren Tucker68afb8c2011-10-02 18:59:03 +110097 { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
Damien Miller456e6f02008-11-03 19:20:10 +110098 { "OpenSSH*", SSH_NEW_OPENSSH },
Ben Lindstrom9eab2622001-12-06 18:06:05 +000099 { "*MindTerm*", 0 },
100 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstrom60a43812001-03-29 00:32:56 +0000101 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Damien Millerd3209042003-04-01 21:44:37 +1000102 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
103 SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000104 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstrom60a43812001-03-29 00:32:56 +0000105 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Damien Millerd3209042003-04-01 21:44:37 +1000106 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
107 SSH_BUG_FIRSTKEX },
Damien Miller9f0f5c62001-12-21 14:45:46 +1100108 { "2.0.13*,"
109 "2.0.14*,"
110 "2.0.15*,"
111 "2.0.16*,"
112 "2.0.17*,"
113 "2.0.18*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000114 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +0000115 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000116 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
Ben Lindstrom671388f2001-04-19 20:40:45 +0000117 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
Ben Lindstromf558cf62001-09-20 23:13:49 +0000118 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
Damien Millerd3209042003-04-01 21:44:37 +1000119 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
Damien Miller9f0f5c62001-12-21 14:45:46 +1100120 { "2.0.11*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000121 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +0000122 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
123 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
Ben Lindstrom60a43812001-03-29 00:32:56 +0000124 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
Ben Lindstromf558cf62001-09-20 23:13:49 +0000125 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
Damien Millerd3209042003-04-01 21:44:37 +1000126 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000127 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstrom8c963922001-04-30 23:06:57 +0000128 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
129 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
130 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
131 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
Damien Millerd3209042003-04-01 21:44:37 +1000132 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
133 SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000134 { "2.2.0*,"
135 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
Damien Millerd3209042003-04-01 21:44:37 +1000136 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
137 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
138 SSH_BUG_FIRSTKEX },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000139 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
Damien Miller1ec46262007-01-05 16:26:45 +1100140 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
141 SSH_BUG_RFWD_ADDR },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000142 { "3.0.*", SSH_BUG_DEBUG },
143 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
144 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
145 { "1.2.18*,"
146 "1.2.19*,"
147 "1.2.20*,"
148 "1.2.21*,"
Damien Miller7630ee22003-09-02 22:52:00 +1000149 "1.2.22*", SSH_BUG_IGNOREMSG },
Ben Lindstromc8226382002-04-10 16:22:09 +0000150 { "1.3.2*", /* F-Secure */
Damien Miller7630ee22003-09-02 22:52:00 +1000151 SSH_BUG_IGNOREMSG },
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000152 { "*SSH Compatible Server*", /* Netscreen */
Ben Lindstromd20d0f32001-03-10 17:22:20 +0000153 SSH_BUG_PASSWORDPAD },
Damien Miller9f0f5c62001-12-21 14:45:46 +1100154 { "*OSU_0*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000155 "OSU_1.0*,"
156 "OSU_1.1*,"
157 "OSU_1.2*,"
158 "OSU_1.3*,"
159 "OSU_1.4*,"
160 "OSU_1.5alpha1*,"
161 "OSU_1.5alpha2*,"
162 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
163 { "*SSH_Version_Mapper*",
Damien Miller27dbe6f2001-03-19 22:36:20 +1100164 SSH_BUG_SCANNER },
Damien Millere9264972002-09-30 11:59:21 +1000165 { "Probe-*",
166 SSH_BUG_PROBE },
Damien Miller50a41ed2000-10-16 12:14:42 +1100167 { NULL, 0 }
Damien Miller33b13562000-04-04 14:38:59 +1000168 };
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000169
Damien Millercaf6dd62000-08-29 11:33:50 +1100170 /* process table, return first match */
Damien Miller874d77b2000-10-14 16:23:11 +1100171 for (i = 0; check[i].pat; i++) {
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000172 if (match_pattern_list(version, check[i].pat,
173 strlen(check[i].pat), 0) == 1) {
Ben Lindstrom971c9732000-12-10 02:01:50 +0000174 debug("match: %s pat %s", version, check[i].pat);
Damien Miller30c3d422000-05-09 11:02:59 +1000175 datafellows = check[i].bugs;
Damien Miller33b13562000-04-04 14:38:59 +1000176 return;
177 }
178 }
Damien Miller874d77b2000-10-14 16:23:11 +1100179 debug("no match: %s", version);
Damien Miller33b13562000-04-04 14:38:59 +1000180}
Damien Miller78928792000-04-12 20:17:38 +1000181
182#define SEP ","
183int
184proto_spec(const char *spec)
185{
Damien Miller37023962000-07-11 17:31:38 +1000186 char *s, *p, *q;
Damien Miller78928792000-04-12 20:17:38 +1000187 int ret = SSH_PROTO_UNKNOWN;
188
Damien Millerb1715dc2000-05-30 13:44:51 +1000189 if (spec == NULL)
190 return ret;
Damien Miller37023962000-07-11 17:31:38 +1000191 q = s = xstrdup(spec);
192 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000193 switch (atoi(p)) {
Damien Miller78928792000-04-12 20:17:38 +1000194 case 1:
195 if (ret == SSH_PROTO_UNKNOWN)
196 ret |= SSH_PROTO_1_PREFERRED;
197 ret |= SSH_PROTO_1;
198 break;
199 case 2:
200 ret |= SSH_PROTO_2;
201 break;
202 default:
Damien Miller996acd22003-04-09 20:59:48 +1000203 logit("ignoring bad proto spec: '%s'.", p);
Damien Miller78928792000-04-12 20:17:38 +1000204 break;
205 }
206 }
207 xfree(s);
208 return ret;
209}
Ben Lindstromc8530c72001-03-24 00:35:19 +0000210
211char *
212compat_cipher_proposal(char *cipher_prop)
213{
Damien Miller0e3b8722002-01-22 23:26:38 +1100214 Buffer b;
Ben Lindstromc8530c72001-03-24 00:35:19 +0000215 char *orig_prop, *fix_ciphers;
216 char *cp, *tmp;
Ben Lindstromc8530c72001-03-24 00:35:19 +0000217
218 if (!(datafellows & SSH_BUG_BIGENDIANAES))
219 return(cipher_prop);
220
Damien Miller0e3b8722002-01-22 23:26:38 +1100221 buffer_init(&b);
Ben Lindstromc8530c72001-03-24 00:35:19 +0000222 tmp = orig_prop = xstrdup(cipher_prop);
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000223 while ((cp = strsep(&tmp, ",")) != NULL) {
Damien Miller914bef42002-01-22 23:34:35 +1100224 if (strncmp(cp, "aes", 3) != 0) {
Damien Miller0e3b8722002-01-22 23:26:38 +1100225 if (buffer_len(&b) > 0)
226 buffer_append(&b, ",", 1);
227 buffer_append(&b, cp, strlen(cp));
Ben Lindstromc8530c72001-03-24 00:35:19 +0000228 }
229 }
Damien Miller0e3b8722002-01-22 23:26:38 +1100230 buffer_append(&b, "\0", 1);
231 fix_ciphers = xstrdup(buffer_ptr(&b));
232 buffer_free(&b);
Ben Lindstromc8530c72001-03-24 00:35:19 +0000233 xfree(orig_prop);
234 debug2("Original cipher proposal: %s", cipher_prop);
235 debug2("Compat cipher proposal: %s", fix_ciphers);
236 if (!*fix_ciphers)
237 fatal("No available ciphers found.");
238
239 return(fix_ciphers);
240}