2 * Copyright (c) 1999, 2000, 2001 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 1.53 2001/09/20 13:50:40 markus Exp $");
29 # include <pcreposix.h>
30 #else /* Use native regex libraries */
34 # include "openbsd-compat/fake-regex.h"
36 #endif /* HAVE_LIBPCRE */
50 verbose("Enabling compatibility mode for protocol 2.0");
56 verbose("Enabling compatibility mode for protocol 1.3");
59 /* datafellows bug compatibility */
61 compat_datafellows(const char *version)
70 { "^OpenSSH[-_]2\\.[012]",
71 SSH_OLD_SESSIONID|SSH_BUG_BANNER|
72 SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
73 { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
74 SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
75 { "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
77 { "^OpenSSH_2\\.5\\.[01]p1",
78 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
80 { "^OpenSSH_2\\.5\\.[012]",
81 SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
82 { "^OpenSSH_2\\.5\\.3",
86 { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
87 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
88 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
89 { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
90 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
91 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
92 { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
93 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
94 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
95 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
96 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
98 { "^2\\.0\\.1[1-2]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
99 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
100 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
101 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
102 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
104 { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
105 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
106 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
107 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
108 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
109 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN },
110 { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_DEBUG|
112 { "^2\\.3\\.", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
113 { "^2\\.[2-9]\\.", SSH_BUG_DEBUG },
114 { "^3\\.0\\.", SSH_BUG_DEBUG },
115 { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
116 { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
117 { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
118 { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
119 { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
120 { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */
121 { "^SSH Compatible Server", /* Netscreen */
122 SSH_BUG_PASSWORDPAD },
123 { "^OSU_0", SSH_BUG_PASSWORDPAD },
124 { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
125 { "^OSU_1\\.5alpha[1-3]",
126 SSH_BUG_PASSWORDPAD },
127 { "^SSH_Version_Mapper",
131 /* process table, return first match */
132 for (i = 0; check[i].pat; i++) {
133 ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
135 regerror(ret, ®, ebuf, sizeof(ebuf));
136 ebuf[sizeof(ebuf)-1] = '\0';
137 error("regerror: %s", ebuf);
140 ret = regexec(®, version, 0, NULL, 0);
143 debug("match: %s pat %s", version, check[i].pat);
144 datafellows = check[i].bugs;
148 debug("no match: %s", version);
153 proto_spec(const char *spec)
156 int ret = SSH_PROTO_UNKNOWN;
160 q = s = xstrdup(spec);
161 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
164 if (ret == SSH_PROTO_UNKNOWN)
165 ret |= SSH_PROTO_1_PREFERRED;
172 log("ignoring bad proto spec: '%s'.", p);
181 compat_cipher_proposal(char *cipher_prop)
183 char *orig_prop, *fix_ciphers;
187 if (!(datafellows & SSH_BUG_BIGENDIANAES))
190 len = strlen(cipher_prop) + 1;
191 fix_ciphers = xmalloc(len);
193 tmp = orig_prop = xstrdup(cipher_prop);
194 while((cp = strsep(&tmp, ",")) != NULL) {
195 if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
197 strlcat(fix_ciphers, ",", len);
198 strlcat(fix_ciphers, cp, len);
202 debug2("Original cipher proposal: %s", cipher_prop);
203 debug2("Compat cipher proposal: %s", fix_ciphers);
205 fatal("No available ciphers found.");