2 * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
26 RCSID("$OpenBSD: compat.c,v 1.41 2001/03/27 10:57:00 markus Exp $");
29 # include <pcreposix.h>
30 #else /* Use native regex libraries */
34 # include "openbsd-compat/fake-regex.h"
36 #endif /* HAVE_LIBPCRE */
50 verbose("Enabling compatibility mode for protocol 2.0");
56 verbose("Enabling compatibility mode for protocol 1.3");
59 /* datafellows bug compatibility */
61 compat_datafellows(const char *version)
70 { "^OpenSSH[-_]2\\.[012]",
71 SSH_OLD_SESSIONID|SSH_BUG_BANNER },
72 { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES },
73 { "^OpenSSH_2\\.5\\.[01]p1",
74 SSH_BUG_BIGENDIANAES },
77 { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
78 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
80 { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
81 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
83 { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
84 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
85 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
86 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5 },
87 { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
88 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
89 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
90 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
92 { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 },
93 { "^2\\.3\\.", SSH_BUG_RSASIGMD5 },
94 { "^2\\.[2-9]\\.", 0 },
95 { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
96 { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
97 { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
98 { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
99 { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
100 { "^SSH Compatible Server", /* Netscreen */
101 SSH_BUG_PASSWORDPAD },
102 { "^OSU_0", SSH_BUG_PASSWORDPAD },
103 { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
104 { "^OSU_1\\.5alpha[1-3]",
105 SSH_BUG_PASSWORDPAD },
106 { "^SSH_Version_Mapper",
110 /* process table, return first match */
111 for (i = 0; check[i].pat; i++) {
112 ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
114 regerror(ret, ®, ebuf, sizeof(ebuf));
115 ebuf[sizeof(ebuf)-1] = '\0';
116 error("regerror: %s", ebuf);
119 ret = regexec(®, version, 0, NULL, 0);
122 debug("match: %s pat %s", version, check[i].pat);
123 datafellows = check[i].bugs;
127 debug("no match: %s", version);
132 proto_spec(const char *spec)
135 int ret = SSH_PROTO_UNKNOWN;
139 q = s = xstrdup(spec);
140 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
143 if (ret == SSH_PROTO_UNKNOWN)
144 ret |= SSH_PROTO_1_PREFERRED;
151 log("ignoring bad proto spec: '%s'.", p);
160 compat_cipher_proposal(char *cipher_prop)
162 char *orig_prop, *fix_ciphers;
166 if (!(datafellows & SSH_BUG_BIGENDIANAES))
169 len = strlen(cipher_prop) + 1;
170 fix_ciphers = xmalloc(len);
172 tmp = orig_prop = xstrdup(cipher_prop);
173 while((cp = strsep(&tmp, ",")) != NULL) {
174 if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
176 strlcat(fix_ciphers, ",", len);
177 strlcat(fix_ciphers, cp, len);
181 debug2("Original cipher proposal: %s", cipher_prop);
182 debug2("Compat cipher proposal: %s", fix_ciphers);
184 fatal("No available ciphers found.");