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-rw-r--r--other/ssharp/compat.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/other/ssharp/compat.c b/other/ssharp/compat.c
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1/*
2 * Copyright (c) 1999,2000 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 *
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
25#include "includes.h"
26RCSID("$OpenBSD: compat.c,v 1.47 2001/04/18 23:43:25 markus Exp $");
27
28#ifdef HAVE_LIBPCRE
29# include <pcreposix.h>
30#else /* Use native regex libraries */
31# ifdef HAVE_REGEX_H
32# include <regex.h>
33# else
34# include "openbsd-compat/fake-regex.h"
35# endif
36#endif /* HAVE_LIBPCRE */
37
38#include "packet.h"
39#include "xmalloc.h"
40#include "compat.h"
41#include "log.h"
42
43int compat13 = 0;
44int compat20 = 0;
45int datafellows = 0;
46
47void
48enable_compat20(void)
49{
50 verbose("Enabling compatibility mode for protocol 2.0");
51 compat20 = 1;
52}
53void
54enable_compat13(void)
55{
56 verbose("Enabling compatibility mode for protocol 1.3");
57 compat13 = 1;
58}
59/* datafellows bug compatibility */
60void
61compat_datafellows(const char *version)
62{
63 int i, ret;
64 char ebuf[1024];
65 regex_t reg;
66 static struct {
67 char *pat;
68 int bugs;
69 } check[] = {
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|
76 SSH_BUG_NOREKEY},
77 { "^OpenSSH_2\\.5\\.[01]p1",
78 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
79 SSH_BUG_NOREKEY },
80 { "^OpenSSH_2\\.5\\.[012]",
81 SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
82 { "^OpenSSH_2\\.5\\.3",
83 SSH_BUG_NOREKEY },
84 { "^OpenSSH", 0 },
85 { "MindTerm", 0 },
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 },
97 { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
98 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
99 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
100 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
101 SSH_BUG_RSASIGMD5 },
102 { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 },
103 { "^2\\.3\\.", SSH_BUG_RSASIGMD5 },
104 { "^2\\.[2-9]\\.", 0 },
105 { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
106 { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
107 { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
108 { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
109 { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
110 { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */
111 { "^SSH Compatible Server", /* Netscreen */
112 SSH_BUG_PASSWORDPAD },
113 { "^OSU_0", SSH_BUG_PASSWORDPAD },
114 { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
115 { "^OSU_1\\.5alpha[1-3]",
116 SSH_BUG_PASSWORDPAD },
117 { "^SSH_Version_Mapper",
118 SSH_BUG_SCANNER },
119 { NULL, 0 }
120 };
121 /* process table, return first match */
122 for (i = 0; check[i].pat; i++) {
123 ret = regcomp(&reg, check[i].pat, REG_EXTENDED|REG_NOSUB);
124 if (ret != 0) {
125 regerror(ret, &reg, ebuf, sizeof(ebuf));
126 ebuf[sizeof(ebuf)-1] = '\0';
127 error("regerror: %s", ebuf);
128 continue;
129 }
130 ret = regexec(&reg, version, 0, NULL, 0);
131 regfree(&reg);
132 if (ret == 0) {
133 debug("match: %s pat %s", version, check[i].pat);
134 datafellows = check[i].bugs;
135 return;
136 }
137 }
138 debug("no match: %s", version);
139}
140
141#define SEP ","
142int
143proto_spec(const char *spec)
144{
145 char *s, *p, *q;
146 int ret = SSH_PROTO_UNKNOWN;
147
148 if (spec == NULL)
149 return ret;
150 q = s = xstrdup(spec);
151 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
152 switch(atoi(p)) {
153 case 1:
154 if (ret == SSH_PROTO_UNKNOWN)
155 ret |= SSH_PROTO_1_PREFERRED;
156 ret |= SSH_PROTO_1;
157 break;
158 case 2:
159 ret |= SSH_PROTO_2;
160 break;
161 default:
162 log("ignoring bad proto spec: '%s'.", p);
163 break;
164 }
165 }
166 xfree(s);
167 return ret;
168}
169
170char *
171compat_cipher_proposal(char *cipher_prop)
172{
173 char *orig_prop, *fix_ciphers;
174 char *cp, *tmp;
175 size_t len;
176
177 if (!(datafellows & SSH_BUG_BIGENDIANAES))
178 return(cipher_prop);
179
180 len = strlen(cipher_prop) + 1;
181 fix_ciphers = xmalloc(len);
182 *fix_ciphers = '\0';
183 tmp = orig_prop = xstrdup(cipher_prop);
184 while((cp = strsep(&tmp, ",")) != NULL) {
185 if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
186 if (*fix_ciphers)
187 strlcat(fix_ciphers, ",", len);
188 strlcat(fix_ciphers, cp, len);
189 }
190 }
191 xfree(orig_prop);
192 debug2("Original cipher proposal: %s", cipher_prop);
193 debug2("Compat cipher proposal: %s", fix_ciphers);
194 if (!*fix_ciphers)
195 fatal("No available ciphers found.");
196
197 return(fix_ciphers);
198}