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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" | |
26 | RCSID("$OpenBSD: compat.c,v 1.40 2001/03/23 11:04:06 djm 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 | ||
43 | int compat13 = 0; | |
44 | int compat20 = 0; | |
45 | int datafellows = 0; | |
46 | ||
47 | void | |
48 | enable_compat20(void) | |
49 | { | |
50 | verbose("Enabling compatibility mode for protocol 2.0"); | |
51 | compat20 = 1; | |
52 | } | |
53 | void | |
54 | enable_compat13(void) | |
55 | { | |
56 | verbose("Enabling compatibility mode for protocol 1.3"); | |
57 | compat13 = 1; | |
58 | } | |
59 | /* datafellows bug compatibility */ | |
60 | void | |
61 | compat_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 | { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES }, | |
73 | { "^OpenSSH_2\\.5\\.[01]p1", | |
74 | SSH_BUG_BIGENDIANAES }, | |
75 | { "^OpenSSH", 0 }, | |
76 | { "MindTerm", 0 }, | |
77 | { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
78 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG }, | |
79 | { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
80 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG }, | |
81 | { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
82 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
83 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
84 | SSH_BUG_PKOK }, | |
85 | { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
86 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
87 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
88 | SSH_BUG_PKAUTH|SSH_BUG_PKOK }, | |
89 | { "^2\\.[23]\\.0", SSH_BUG_HMAC }, | |
90 | { "^2\\.[2-9]\\.", 0 }, | |
91 | { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */ | |
92 | { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID }, | |
93 | { "^1\\.7 SecureFX", SSH_OLD_SESSIONID }, | |
94 | { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG }, | |
95 | { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG }, | |
96 | { "^SSH Compatible Server", /* Netscreen */ | |
97 | SSH_BUG_PASSWORDPAD }, | |
98 | { "^OSU_0", SSH_BUG_PASSWORDPAD }, | |
99 | { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD }, | |
100 | { "^OSU_1\\.5alpha[1-3]", | |
101 | SSH_BUG_PASSWORDPAD }, | |
102 | { "^SSH_Version_Mapper", | |
103 | SSH_BUG_SCANNER }, | |
104 | { NULL, 0 } | |
105 | }; | |
106 | /* process table, return first match */ | |
107 | for (i = 0; check[i].pat; i++) { | |
108 | ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB); | |
109 | if (ret != 0) { | |
110 | regerror(ret, ®, ebuf, sizeof(ebuf)); | |
111 | ebuf[sizeof(ebuf)-1] = '\0'; | |
112 | error("regerror: %s", ebuf); | |
113 | continue; | |
114 | } | |
115 | ret = regexec(®, version, 0, NULL, 0); | |
116 | regfree(®); | |
117 | if (ret == 0) { | |
118 | debug("match: %s pat %s", version, check[i].pat); | |
119 | datafellows = check[i].bugs; | |
120 | return; | |
121 | } | |
122 | } | |
123 | debug("no match: %s", version); | |
124 | } | |
125 | ||
126 | #define SEP "," | |
127 | int | |
128 | proto_spec(const char *spec) | |
129 | { | |
130 | char *s, *p, *q; | |
131 | int ret = SSH_PROTO_UNKNOWN; | |
132 | ||
133 | if (spec == NULL) | |
134 | return ret; | |
135 | q = s = xstrdup(spec); | |
136 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
137 | switch(atoi(p)) { | |
138 | case 1: | |
139 | if (ret == SSH_PROTO_UNKNOWN) | |
140 | ret |= SSH_PROTO_1_PREFERRED; | |
141 | ret |= SSH_PROTO_1; | |
142 | break; | |
143 | case 2: | |
144 | ret |= SSH_PROTO_2; | |
145 | break; | |
146 | default: | |
147 | log("ignoring bad proto spec: '%s'.", p); | |
148 | break; | |
149 | } | |
150 | } | |
151 | xfree(s); | |
152 | return ret; | |
153 | } | |
154 | ||
155 | char * | |
156 | compat_cipher_proposal(char *cipher_prop) | |
157 | { | |
158 | char *orig_prop, *fix_ciphers; | |
159 | char *cp, *tmp; | |
160 | size_t len; | |
161 | ||
162 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
163 | return(cipher_prop); | |
164 | ||
165 | len = strlen(cipher_prop) + 1; | |
166 | fix_ciphers = xmalloc(len); | |
167 | *fix_ciphers = '\0'; | |
168 | tmp = orig_prop = xstrdup(cipher_prop); | |
169 | while((cp = strsep(&tmp, ",")) != NULL) { | |
170 | if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) { | |
171 | if (*fix_ciphers) | |
172 | strlcat(fix_ciphers, ",", len); | |
173 | strlcat(fix_ciphers, cp, len); | |
174 | } | |
175 | } | |
176 | xfree(orig_prop); | |
177 | debug2("Original cipher proposal: %s", cipher_prop); | |
178 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
179 | if (!*fix_ciphers) | |
180 | fatal("No available ciphers found."); | |
181 | ||
182 | return(fix_ciphers); | |
183 | } |