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 1.44 2001/04/05 10:00:06 markus Exp $");
29 # include <pcreposix.h>
30 #else /* Use native regex libraries */
34 # include "openbsd-compat/fake-regex.h"
36 #endif /* HAVE_LIBPCRE */
50 verbose("Enabling compatibility mode for protocol 2.0");
56 verbose("Enabling compatibility mode for protocol 1.3");
59 /* datafellows bug compatibility */
61 compat_datafellows(const char *version)
70 { "^OpenSSH[-_]2\\.[012]",
71 SSH_OLD_SESSIONID|SSH_BUG_BANNER|
73 { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
75 { "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX},
76 { "^OpenSSH_2\\.5\\.[01]p1",
77 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX },
78 { "^OpenSSH_2\\.5\\.[012]",
82 { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
83 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
85 { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
86 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
88 { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
89 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
90 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
91 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5 },
92 { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
93 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
94 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
95 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
97 { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 },
98 { "^2\\.3\\.", SSH_BUG_RSASIGMD5 },
99 { "^2\\.[2-9]\\.", 0 },
100 { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
101 { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
102 { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
103 { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
104 { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
105 { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */
106 { "^SSH Compatible Server", /* Netscreen */
107 SSH_BUG_PASSWORDPAD },
108 { "^OSU_0", SSH_BUG_PASSWORDPAD },
109 { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
110 { "^OSU_1\\.5alpha[1-3]",
111 SSH_BUG_PASSWORDPAD },
112 { "^SSH_Version_Mapper",
116 /* process table, return first match */
117 for (i = 0; check[i].pat; i++) {
118 ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
120 regerror(ret, ®, ebuf, sizeof(ebuf));
121 ebuf[sizeof(ebuf)-1] = '\0';
122 error("regerror: %s", ebuf);
125 ret = regexec(®, version, 0, NULL, 0);
128 debug("match: %s pat %s", version, check[i].pat);
129 datafellows = check[i].bugs;
133 debug("no match: %s", version);
138 proto_spec(const char *spec)
141 int ret = SSH_PROTO_UNKNOWN;
145 q = s = xstrdup(spec);
146 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
149 if (ret == SSH_PROTO_UNKNOWN)
150 ret |= SSH_PROTO_1_PREFERRED;
157 log("ignoring bad proto spec: '%s'.", p);
166 compat_cipher_proposal(char *cipher_prop)
168 char *orig_prop, *fix_ciphers;
172 if (!(datafellows & SSH_BUG_BIGENDIANAES))
175 len = strlen(cipher_prop) + 1;
176 fix_ciphers = xmalloc(len);
178 tmp = orig_prop = xstrdup(cipher_prop);
179 while((cp = strsep(&tmp, ",")) != NULL) {
180 if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
182 strlcat(fix_ciphers, ",", len);
183 strlcat(fix_ciphers, cp, len);
187 debug2("Original cipher proposal: %s", cipher_prop);
188 debug2("Compat cipher proposal: %s", fix_ciphers);
190 fatal("No available ciphers found.");