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Damien Miller5428f641999-11-25 11:54:57 +11001/*
Damien Millere4340be2000-09-16 13:29:08 +11002 * Copyright (c) 1999,2000 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 Miller27dbe6f2001-03-19 22:36:20 +110026RCSID("$OpenBSD: compat.c,v 1.39 2001/03/18 23:30:55 deraadt Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
Ben Lindstromb5628642000-10-18 00:02:25 +000028#ifdef HAVE_LIBPCRE
29# include <pcreposix.h>
Ben Lindstromca1c2a02000-10-14 21:33:19 +000030#else /* Use native regex libraries */
Ben Lindstrom401d58f2001-01-19 17:11:43 +000031# ifdef HAVE_REGEX_H
32# include <regex.h>
33# else
Tim Riceb399be42001-03-17 18:43:16 -080034# include "openbsd-compat/fake-regex.h"
Ben Lindstrom401d58f2001-01-19 17:11:43 +000035# endif
Kevin Steves48d0d252000-12-15 23:05:57 +000036#endif /* HAVE_LIBPCRE */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
Ben Lindstrom226cfa02001-01-22 05:34:40 +000038#include "packet.h"
39#include "xmalloc.h"
40#include "compat.h"
41#include "log.h"
42
Damien Miller95def091999-11-25 00:26:21 +110043int compat13 = 0;
Damien Miller33b13562000-04-04 14:38:59 +100044int compat20 = 0;
45int datafellows = 0;
Damien Miller95def091999-11-25 00:26:21 +110046
Damien Miller4af51302000-04-16 11:18:38 +100047void
Damien Miller33b13562000-04-04 14:38:59 +100048enable_compat20(void)
49{
Damien Miller1383bd82000-04-06 12:32:37 +100050 verbose("Enabling compatibility mode for protocol 2.0");
51 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{
56 verbose("Enabling compatibility mode for protocol 1.3");
57 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{
Damien Miller874d77b2000-10-14 16:23:11 +110063 int i, ret;
64 char ebuf[1024];
65 regex_t reg;
66 static struct {
67 char *pat;
Damien Miller30c3d422000-05-09 11:02:59 +100068 int bugs;
69 } check[] = {
Ben Lindstrom48bd7c12001-01-09 00:35:42 +000070 { "^OpenSSH[-_]2\\.[012]",
71 SSH_OLD_SESSIONID|SSH_BUG_BANNER },
72 { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER },
73 { "^OpenSSH", 0 },
Damien Miller50a41ed2000-10-16 12:14:42 +110074 { "MindTerm", 0 },
Ben Lindstromd121f612000-12-03 17:00:47 +000075 { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +000076 SSH_OLD_SESSIONID|SSH_BUG_DEBUG },
Ben Lindstrom5de86cc2001-03-05 06:08:19 +000077 { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
78 SSH_OLD_SESSIONID|SSH_BUG_DEBUG },
Ben Lindstromd121f612000-12-03 17:00:47 +000079 { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +000080 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Ben Lindstrom266dfdf2001-03-09 00:12:22 +000081 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
82 SSH_BUG_PKOK },
Ben Lindstromd121f612000-12-03 17:00:47 +000083 { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +000084 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
85 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
Ben Lindstrom266dfdf2001-03-09 00:12:22 +000086 SSH_BUG_PKAUTH|SSH_BUG_PKOK },
Ben Lindstromd20d0f32001-03-10 17:22:20 +000087 { "^2\\.[23]\\.0", SSH_BUG_HMAC },
Damien Miller50a41ed2000-10-16 12:14:42 +110088 { "^2\\.[2-9]\\.", 0 },
Ben Lindstromd20d0f32001-03-10 17:22:20 +000089 { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
90 { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
91 { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
92 { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
93 { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
94 { "^SSH Compatible Server", /* Netscreen */
95 SSH_BUG_PASSWORDPAD },
96 { "^OSU_0", SSH_BUG_PASSWORDPAD },
97 { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
98 { "^OSU_1\\.5alpha[1-3]",
99 SSH_BUG_PASSWORDPAD },
Damien Miller27dbe6f2001-03-19 22:36:20 +1100100 { "^SSH_Version_Mapper",
101 SSH_BUG_SCANNER },
Damien Miller50a41ed2000-10-16 12:14:42 +1100102 { NULL, 0 }
Damien Miller33b13562000-04-04 14:38:59 +1000103 };
Damien Millercaf6dd62000-08-29 11:33:50 +1100104 /* process table, return first match */
Damien Miller874d77b2000-10-14 16:23:11 +1100105 for (i = 0; check[i].pat; i++) {
106 ret = regcomp(&reg, check[i].pat, REG_EXTENDED|REG_NOSUB);
107 if (ret != 0) {
108 regerror(ret, &reg, ebuf, sizeof(ebuf));
109 ebuf[sizeof(ebuf)-1] = '\0';
110 error("regerror: %s", ebuf);
111 continue;
112 }
113 ret = regexec(&reg, version, 0, NULL, 0);
114 regfree(&reg);
115 if (ret == 0) {
Ben Lindstrom971c9732000-12-10 02:01:50 +0000116 debug("match: %s pat %s", version, check[i].pat);
Damien Miller30c3d422000-05-09 11:02:59 +1000117 datafellows = check[i].bugs;
Damien Miller33b13562000-04-04 14:38:59 +1000118 return;
119 }
120 }
Damien Miller874d77b2000-10-14 16:23:11 +1100121 debug("no match: %s", version);
Damien Miller33b13562000-04-04 14:38:59 +1000122}
Damien Miller78928792000-04-12 20:17:38 +1000123
124#define SEP ","
125int
126proto_spec(const char *spec)
127{
Damien Miller37023962000-07-11 17:31:38 +1000128 char *s, *p, *q;
Damien Miller78928792000-04-12 20:17:38 +1000129 int ret = SSH_PROTO_UNKNOWN;
130
Damien Millerb1715dc2000-05-30 13:44:51 +1000131 if (spec == NULL)
132 return ret;
Damien Miller37023962000-07-11 17:31:38 +1000133 q = s = xstrdup(spec);
134 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
Damien Miller78928792000-04-12 20:17:38 +1000135 switch(atoi(p)) {
136 case 1:
137 if (ret == SSH_PROTO_UNKNOWN)
138 ret |= SSH_PROTO_1_PREFERRED;
139 ret |= SSH_PROTO_1;
140 break;
141 case 2:
142 ret |= SSH_PROTO_2;
143 break;
144 default:
145 log("ignoring bad proto spec: '%s'.", p);
146 break;
147 }
148 }
149 xfree(s);
150 return ret;
151}