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1 | /* $OpenBSD: compat.c,v 1.77 2006/12/12 03:58:42 djm Exp $ */ | |
2 | /* | |
3 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
27 | ||
28 | #include <sys/types.h> | |
29 | ||
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <stdarg.h> | |
33 | ||
34 | #include "xmalloc.h" | |
35 | #include "buffer.h" | |
36 | #include "packet.h" | |
37 | #include "compat.h" | |
38 | #include "log.h" | |
39 | #include "match.h" | |
40 | ||
41 | int compat13 = 0; | |
42 | int compat20 = 0; | |
43 | int datafellows = 0; | |
44 | ||
45 | void | |
46 | enable_compat20(void) | |
47 | { | |
48 | debug("Enabling compatibility mode for protocol 2.0"); | |
49 | compat20 = 1; | |
50 | } | |
51 | void | |
52 | enable_compat13(void) | |
53 | { | |
54 | debug("Enabling compatibility mode for protocol 1.3"); | |
55 | compat13 = 1; | |
56 | } | |
57 | /* datafellows bug compatibility */ | |
58 | void | |
59 | compat_datafellows(const char *version) | |
60 | { | |
61 | int i; | |
62 | static struct { | |
63 | char *pat; | |
64 | int bugs; | |
65 | } check[] = { | |
66 | { "OpenSSH-2.0*," | |
67 | "OpenSSH-2.1*," | |
68 | "OpenSSH_2.1*," | |
69 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
70 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| | |
71 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, | |
72 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| | |
73 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| | |
74 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, | |
75 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| | |
76 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
77 | SSH_OLD_FORWARD_ADDR}, | |
78 | { "OpenSSH_2.5.0p1*," | |
79 | "OpenSSH_2.5.1p1*", | |
80 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| | |
81 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
82 | SSH_OLD_FORWARD_ADDR}, | |
83 | { "OpenSSH_2.5.0*," | |
84 | "OpenSSH_2.5.1*," | |
85 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| | |
86 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, | |
87 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
88 | SSH_OLD_FORWARD_ADDR}, | |
89 | { "OpenSSH_2.*," | |
90 | "OpenSSH_3.0*," | |
91 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, | |
92 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, | |
93 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, | |
94 | { "OpenSSH*", 0 }, | |
95 | { "*MindTerm*", 0 }, | |
96 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
97 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
98 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| | |
99 | SSH_BUG_FIRSTKEX }, | |
100 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
101 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
102 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| | |
103 | SSH_BUG_FIRSTKEX }, | |
104 | { "2.0.13*," | |
105 | "2.0.14*," | |
106 | "2.0.15*," | |
107 | "2.0.16*," | |
108 | "2.0.17*," | |
109 | "2.0.18*," | |
110 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
111 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
112 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
113 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| | |
114 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| | |
115 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, | |
116 | { "2.0.11*," | |
117 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
118 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
119 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
120 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
121 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
122 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, | |
123 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
124 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| | |
125 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
126 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
127 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
128 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| | |
129 | SSH_BUG_FIRSTKEX }, | |
130 | { "2.2.0*," | |
131 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
132 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, | |
133 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| | |
134 | SSH_BUG_FIRSTKEX }, | |
135 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ | |
136 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX| | |
137 | SSH_BUG_RFWD_ADDR }, | |
138 | { "3.0.*", SSH_BUG_DEBUG }, | |
139 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
140 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
141 | { "1.2.18*," | |
142 | "1.2.19*," | |
143 | "1.2.20*," | |
144 | "1.2.21*," | |
145 | "1.2.22*", SSH_BUG_IGNOREMSG }, | |
146 | { "1.3.2*", /* F-Secure */ | |
147 | SSH_BUG_IGNOREMSG }, | |
148 | { "*SSH Compatible Server*", /* Netscreen */ | |
149 | SSH_BUG_PASSWORDPAD }, | |
150 | { "*OSU_0*," | |
151 | "OSU_1.0*," | |
152 | "OSU_1.1*," | |
153 | "OSU_1.2*," | |
154 | "OSU_1.3*," | |
155 | "OSU_1.4*," | |
156 | "OSU_1.5alpha1*," | |
157 | "OSU_1.5alpha2*," | |
158 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
159 | { "*SSH_Version_Mapper*", | |
160 | SSH_BUG_SCANNER }, | |
161 | { "Probe-*", | |
162 | SSH_BUG_PROBE }, | |
163 | { NULL, 0 } | |
164 | }; | |
165 | ||
166 | /* process table, return first match */ | |
167 | for (i = 0; check[i].pat; i++) { | |
168 | if (match_pattern_list(version, check[i].pat, | |
169 | strlen(check[i].pat), 0) == 1) { | |
170 | debug("match: %s pat %s", version, check[i].pat); | |
171 | datafellows = check[i].bugs; | |
172 | return; | |
173 | } | |
174 | } | |
175 | debug("no match: %s", version); | |
176 | } | |
177 | ||
178 | #define SEP "," | |
179 | int | |
180 | proto_spec(const char *spec) | |
181 | { | |
182 | char *s, *p, *q; | |
183 | int ret = SSH_PROTO_UNKNOWN; | |
184 | ||
185 | if (spec == NULL) | |
186 | return ret; | |
187 | q = s = xstrdup(spec); | |
188 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
189 | switch (atoi(p)) { | |
190 | case 1: | |
191 | if (ret == SSH_PROTO_UNKNOWN) | |
192 | ret |= SSH_PROTO_1_PREFERRED; | |
193 | ret |= SSH_PROTO_1; | |
194 | break; | |
195 | case 2: | |
196 | ret |= SSH_PROTO_2; | |
197 | break; | |
198 | default: | |
199 | logit("ignoring bad proto spec: '%s'.", p); | |
200 | break; | |
201 | } | |
202 | } | |
203 | xfree(s); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | char * | |
208 | compat_cipher_proposal(char *cipher_prop) | |
209 | { | |
210 | Buffer b; | |
211 | char *orig_prop, *fix_ciphers; | |
212 | char *cp, *tmp; | |
213 | ||
214 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
215 | return(cipher_prop); | |
216 | ||
217 | buffer_init(&b); | |
218 | tmp = orig_prop = xstrdup(cipher_prop); | |
219 | while ((cp = strsep(&tmp, ",")) != NULL) { | |
220 | if (strncmp(cp, "aes", 3) != 0) { | |
221 | if (buffer_len(&b) > 0) | |
222 | buffer_append(&b, ",", 1); | |
223 | buffer_append(&b, cp, strlen(cp)); | |
224 | } | |
225 | } | |
226 | buffer_append(&b, "\0", 1); | |
227 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
228 | buffer_free(&b); | |
229 | xfree(orig_prop); | |
230 | debug2("Original cipher proposal: %s", cipher_prop); | |
231 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
232 | if (!*fix_ciphers) | |
233 | fatal("No available ciphers found."); | |
234 | ||
235 | return(fix_ciphers); | |
236 | } |