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1 | /* | |
2 | * Copyright (c) 1999, 2000, 2001, 2002 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 1.64 2002/09/19 14:53:14 stevesk Exp $"); | |
27 | ||
28 | #include "buffer.h" | |
29 | #include "packet.h" | |
30 | #include "xmalloc.h" | |
31 | #include "compat.h" | |
32 | #include "log.h" | |
33 | #include "match.h" | |
34 | ||
35 | int compat13 = 0; | |
36 | int compat20 = 0; | |
37 | int datafellows = 0; | |
38 | ||
39 | void | |
40 | enable_compat20(void) | |
41 | { | |
42 | debug("Enabling compatibility mode for protocol 2.0"); | |
43 | compat20 = 1; | |
44 | } | |
45 | void | |
46 | enable_compat13(void) | |
47 | { | |
48 | debug("Enabling compatibility mode for protocol 1.3"); | |
49 | compat13 = 1; | |
50 | } | |
51 | /* datafellows bug compatibility */ | |
52 | void | |
53 | compat_datafellows(const char *version) | |
54 | { | |
55 | int i; | |
56 | static struct { | |
57 | char *pat; | |
58 | int bugs; | |
59 | } check[] = { | |
60 | { "OpenSSH-2.0*," | |
61 | "OpenSSH-2.1*," | |
62 | "OpenSSH_2.1*," | |
63 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
64 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| | |
65 | SSH_BUG_EXTEOF}, | |
66 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| | |
67 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| | |
68 | SSH_BUG_EXTEOF}, | |
69 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| | |
70 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, | |
71 | { "OpenSSH_2.5.0p1*," | |
72 | "OpenSSH_2.5.1p1*", | |
73 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| | |
74 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, | |
75 | { "OpenSSH_2.5.0*," | |
76 | "OpenSSH_2.5.1*," | |
77 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| | |
78 | SSH_BUG_EXTEOF}, | |
79 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, | |
80 | { "OpenSSH_2.*," | |
81 | "OpenSSH_3.0*," | |
82 | "OpenSSH_3.1*", SSH_BUG_EXTEOF}, | |
83 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, | |
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 | { "2.0.13*," | |
93 | "2.0.14*," | |
94 | "2.0.15*," | |
95 | "2.0.16*," | |
96 | "2.0.17*," | |
97 | "2.0.18*," | |
98 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
99 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
100 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
101 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| | |
102 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| | |
103 | SSH_BUG_DUMMYCHAN }, | |
104 | { "2.0.11*," | |
105 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
106 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
107 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
108 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
109 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
110 | SSH_BUG_DUMMYCHAN }, | |
111 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
112 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
113 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
114 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
115 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
116 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN }, | |
117 | { "2.2.0*," | |
118 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
119 | SSH_BUG_RSASIGMD5 }, | |
120 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 }, | |
121 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ | |
122 | { "2.*", SSH_BUG_DEBUG }, | |
123 | { "3.0.*", SSH_BUG_DEBUG }, | |
124 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
125 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
126 | { "1.2.18*," | |
127 | "1.2.19*," | |
128 | "1.2.20*," | |
129 | "1.2.21*," | |
130 | "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, | |
131 | { "1.3.2*", /* F-Secure */ | |
132 | SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, | |
133 | { "1.2.1*," | |
134 | "1.2.2*," | |
135 | "1.2.3*", SSH_BUG_K5USER }, | |
136 | { "*SSH Compatible Server*", /* Netscreen */ | |
137 | SSH_BUG_PASSWORDPAD }, | |
138 | { "*OSU_0*," | |
139 | "OSU_1.0*," | |
140 | "OSU_1.1*," | |
141 | "OSU_1.2*," | |
142 | "OSU_1.3*," | |
143 | "OSU_1.4*," | |
144 | "OSU_1.5alpha1*," | |
145 | "OSU_1.5alpha2*," | |
146 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
147 | { "*SSH_Version_Mapper*", | |
148 | SSH_BUG_SCANNER }, | |
149 | { NULL, 0 } | |
150 | }; | |
151 | ||
152 | /* process table, return first match */ | |
153 | for (i = 0; check[i].pat; i++) { | |
154 | if (match_pattern_list(version, check[i].pat, | |
155 | strlen(check[i].pat), 0) == 1) { | |
156 | debug("match: %s pat %s", version, check[i].pat); | |
157 | datafellows = check[i].bugs; | |
158 | return; | |
159 | } | |
160 | } | |
161 | debug("no match: %s", version); | |
162 | } | |
163 | ||
164 | #define SEP "," | |
165 | int | |
166 | proto_spec(const char *spec) | |
167 | { | |
168 | char *s, *p, *q; | |
169 | int ret = SSH_PROTO_UNKNOWN; | |
170 | ||
171 | if (spec == NULL) | |
172 | return ret; | |
173 | q = s = xstrdup(spec); | |
174 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
175 | switch (atoi(p)) { | |
176 | case 1: | |
177 | if (ret == SSH_PROTO_UNKNOWN) | |
178 | ret |= SSH_PROTO_1_PREFERRED; | |
179 | ret |= SSH_PROTO_1; | |
180 | break; | |
181 | case 2: | |
182 | ret |= SSH_PROTO_2; | |
183 | break; | |
184 | default: | |
185 | log("ignoring bad proto spec: '%s'.", p); | |
186 | break; | |
187 | } | |
188 | } | |
189 | xfree(s); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | char * | |
194 | compat_cipher_proposal(char *cipher_prop) | |
195 | { | |
196 | Buffer b; | |
197 | char *orig_prop, *fix_ciphers; | |
198 | char *cp, *tmp; | |
199 | ||
200 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
201 | return(cipher_prop); | |
202 | ||
203 | buffer_init(&b); | |
204 | tmp = orig_prop = xstrdup(cipher_prop); | |
205 | while ((cp = strsep(&tmp, ",")) != NULL) { | |
206 | if (strncmp(cp, "aes", 3) != 0) { | |
207 | if (buffer_len(&b) > 0) | |
208 | buffer_append(&b, ",", 1); | |
209 | buffer_append(&b, cp, strlen(cp)); | |
210 | } | |
211 | } | |
212 | buffer_append(&b, "\0", 1); | |
213 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
214 | buffer_free(&b); | |
215 | xfree(orig_prop); | |
216 | debug2("Original cipher proposal: %s", cipher_prop); | |
217 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
218 | if (!*fix_ciphers) | |
219 | fatal("No available ciphers found."); | |
220 | ||
221 | return(fix_ciphers); | |
222 | } |