blob: a2d3a33831a7c1ddc5b900436d3e54ab267fade1 [file] [log] [blame]
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"
Ben Lindstrom971c9732000-12-10 02:01:50 +000026RCSID("$OpenBSD: compat.c,v 1.32 2000/12/09 23:51:11 provos Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
28#include "ssh.h"
Damien Miller33b13562000-04-04 14:38:59 +100029#include "packet.h"
Damien Miller78928792000-04-12 20:17:38 +100030#include "xmalloc.h"
31#include "compat.h"
Ben Lindstromb5628642000-10-18 00:02:25 +000032#ifdef HAVE_LIBPCRE
33# include <pcreposix.h>
Ben Lindstromca1c2a02000-10-14 21:33:19 +000034#else /* Use native regex libraries */
35# include <regex.h>
Kevin Steves48d0d252000-12-15 23:05:57 +000036#endif /* HAVE_LIBPCRE */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
Damien Miller95def091999-11-25 00:26:21 +110038int compat13 = 0;
Damien Miller33b13562000-04-04 14:38:59 +100039int compat20 = 0;
40int datafellows = 0;
Damien Miller95def091999-11-25 00:26:21 +110041
Damien Miller4af51302000-04-16 11:18:38 +100042void
Damien Miller33b13562000-04-04 14:38:59 +100043enable_compat20(void)
44{
Damien Miller1383bd82000-04-06 12:32:37 +100045 verbose("Enabling compatibility mode for protocol 2.0");
46 compat20 = 1;
Damien Miller33b13562000-04-04 14:38:59 +100047}
Damien Miller4af51302000-04-16 11:18:38 +100048void
Damien Miller95def091999-11-25 00:26:21 +110049enable_compat13(void)
50{
51 verbose("Enabling compatibility mode for protocol 1.3");
52 compat13 = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053}
Damien Miller33b13562000-04-04 14:38:59 +100054/* datafellows bug compatibility */
55void
56compat_datafellows(const char *version)
57{
Damien Miller874d77b2000-10-14 16:23:11 +110058 int i, ret;
59 char ebuf[1024];
60 regex_t reg;
61 static struct {
62 char *pat;
Damien Miller30c3d422000-05-09 11:02:59 +100063 int bugs;
64 } check[] = {
Ben Lindstromf2de06b2000-11-05 05:42:36 +000065 { "^OpenSSH[-_]2\\.[012]", SSH_OLD_SESSIONID },
Damien Miller50a41ed2000-10-16 12:14:42 +110066 { "MindTerm", 0 },
Ben Lindstromd121f612000-12-03 17:00:47 +000067 { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +000068 SSH_OLD_SESSIONID|SSH_BUG_DEBUG },
Ben Lindstromd121f612000-12-03 17:00:47 +000069 { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +000070 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
Ben Lindstromd121f612000-12-03 17:00:47 +000071 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD },
72 { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
Ben Lindstroma14ee472000-12-07 01:24:58 +000073 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
74 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
75 SSH_BUG_PKAUTH },
Ben Lindstromd121f612000-12-03 17:00:47 +000076 { "^2\\.[23]\\.0", SSH_BUG_HMAC},
Damien Miller50a41ed2000-10-16 12:14:42 +110077 { "^2\\.[2-9]\\.", 0 },
Damien Miller69b69aa2000-10-28 14:19:58 +110078 { "^2\\.4$", SSH_OLD_SESSIONID}, /* Van Dyke */
79 { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID},
80 { "^1\\.7 SecureFX", SSH_OLD_SESSIONID},
Damien Miller50a41ed2000-10-16 12:14:42 +110081 { NULL, 0 }
Damien Miller33b13562000-04-04 14:38:59 +100082 };
Damien Millercaf6dd62000-08-29 11:33:50 +110083 /* process table, return first match */
Damien Miller874d77b2000-10-14 16:23:11 +110084 for (i = 0; check[i].pat; i++) {
85 ret = regcomp(&reg, check[i].pat, REG_EXTENDED|REG_NOSUB);
86 if (ret != 0) {
87 regerror(ret, &reg, ebuf, sizeof(ebuf));
88 ebuf[sizeof(ebuf)-1] = '\0';
89 error("regerror: %s", ebuf);
90 continue;
91 }
92 ret = regexec(&reg, version, 0, NULL, 0);
93 regfree(&reg);
94 if (ret == 0) {
Ben Lindstrom971c9732000-12-10 02:01:50 +000095 debug("match: %s pat %s", version, check[i].pat);
Damien Miller30c3d422000-05-09 11:02:59 +100096 datafellows = check[i].bugs;
Damien Miller33b13562000-04-04 14:38:59 +100097 return;
98 }
99 }
Damien Miller874d77b2000-10-14 16:23:11 +1100100 debug("no match: %s", version);
Damien Miller33b13562000-04-04 14:38:59 +1000101}
Damien Miller78928792000-04-12 20:17:38 +1000102
103#define SEP ","
104int
105proto_spec(const char *spec)
106{
Damien Miller37023962000-07-11 17:31:38 +1000107 char *s, *p, *q;
Damien Miller78928792000-04-12 20:17:38 +1000108 int ret = SSH_PROTO_UNKNOWN;
109
Damien Millerb1715dc2000-05-30 13:44:51 +1000110 if (spec == NULL)
111 return ret;
Damien Miller37023962000-07-11 17:31:38 +1000112 q = s = xstrdup(spec);
113 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
Damien Miller78928792000-04-12 20:17:38 +1000114 switch(atoi(p)) {
115 case 1:
116 if (ret == SSH_PROTO_UNKNOWN)
117 ret |= SSH_PROTO_1_PREFERRED;
118 ret |= SSH_PROTO_1;
119 break;
120 case 2:
121 ret |= SSH_PROTO_2;
122 break;
123 default:
124 log("ignoring bad proto spec: '%s'.", p);
125 break;
126 }
127 }
128 xfree(s);
129 return ret;
130}