blob: e3410d4979f161d1bdcd19cac03ac2e7260caeb8 [file] [log] [blame]
Damien Miller5428f641999-11-25 11:54:57 +11001/*
2 * Copyright (c) 1999 Markus Friedl. All rights reserved.
3 *
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.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Markus Friedl.
15 * 4. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
Damien Millerd4a8b7e1999-10-27 13:42:43 +100030#include "includes.h"
Damien Miller6536c7d2000-06-22 21:32:31 +100031RCSID("$OpenBSD: compat.c,v 1.17 2000/06/20 01:39:40 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100032
33#include "ssh.h"
Damien Miller33b13562000-04-04 14:38:59 +100034#include "packet.h"
Damien Miller78928792000-04-12 20:17:38 +100035#include "xmalloc.h"
36#include "compat.h"
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{
58 int i;
59 size_t len;
Damien Miller30c3d422000-05-09 11:02:59 +100060 struct {
61 char *version;
62 int bugs;
63 } check[] = {
Damien Miller6536c7d2000-06-22 21:32:31 +100064 {"2.2.0", SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING},
Damien Miller30c3d422000-05-09 11:02:59 +100065 {"2.1.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC},
66 {"2.0.1", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD},
67 {NULL, 0}
Damien Miller33b13562000-04-04 14:38:59 +100068 };
Damien Miller30c3d422000-05-09 11:02:59 +100069 for (i = 0; check[i].version; i++) {
70 len = strlen(check[i].version);
Damien Miller33b13562000-04-04 14:38:59 +100071 if (strlen(version) >= len &&
Damien Miller30c3d422000-05-09 11:02:59 +100072 (strncmp(version, check[i].version, len) == 0)) {
Damien Miller78928792000-04-12 20:17:38 +100073 verbose("datafellows: %.200s", version);
Damien Miller30c3d422000-05-09 11:02:59 +100074 datafellows = check[i].bugs;
Damien Miller33b13562000-04-04 14:38:59 +100075 return;
76 }
77 }
78}
Damien Miller78928792000-04-12 20:17:38 +100079
80#define SEP ","
81int
82proto_spec(const char *spec)
83{
Damien Millerb1715dc2000-05-30 13:44:51 +100084 char *s, *p;
Damien Miller78928792000-04-12 20:17:38 +100085 int ret = SSH_PROTO_UNKNOWN;
86
Damien Millerb1715dc2000-05-30 13:44:51 +100087 if (spec == NULL)
88 return ret;
89 s = xstrdup(spec);
Damien Miller78928792000-04-12 20:17:38 +100090 for ((p = strtok(s, SEP)); p; (p = strtok(NULL, SEP))) {
91 switch(atoi(p)) {
92 case 1:
93 if (ret == SSH_PROTO_UNKNOWN)
94 ret |= SSH_PROTO_1_PREFERRED;
95 ret |= SSH_PROTO_1;
96 break;
97 case 2:
98 ret |= SSH_PROTO_2;
99 break;
100 default:
101 log("ignoring bad proto spec: '%s'.", p);
102 break;
103 }
104 }
105 xfree(s);
106 return ret;
107}