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aa3378df | 1 | /* |
dbe426a1 | 2 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
aa3378df | 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. | |
aa3378df | 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 | ||
8efc0c15 | 25 | #include "includes.h" |
519bdfe8 | 26 | RCSID("$OpenBSD: compat.c,v 1.66 2003/04/01 10:31:26 markus Exp $"); |
8efc0c15 | 27 | |
3469eac4 | 28 | #include "buffer.h" |
42f11eb2 | 29 | #include "packet.h" |
30 | #include "xmalloc.h" | |
31 | #include "compat.h" | |
32 | #include "log.h" | |
6a92533a | 33 | #include "match.h" |
42f11eb2 | 34 | |
5260325f | 35 | int compat13 = 0; |
7e7327a1 | 36 | int compat20 = 0; |
37 | int datafellows = 0; | |
5260325f | 38 | |
6ae2364d | 39 | void |
7e7327a1 | 40 | enable_compat20(void) |
41 | { | |
f86b0eef | 42 | debug("Enabling compatibility mode for protocol 2.0"); |
8ce64345 | 43 | compat20 = 1; |
7e7327a1 | 44 | } |
6ae2364d | 45 | void |
5260325f | 46 | enable_compat13(void) |
47 | { | |
f86b0eef | 48 | debug("Enabling compatibility mode for protocol 1.3"); |
5260325f | 49 | compat13 = 1; |
8efc0c15 | 50 | } |
7e7327a1 | 51 | /* datafellows bug compatibility */ |
52 | void | |
53 | compat_datafellows(const char *version) | |
54 | { | |
6a92533a | 55 | int i; |
94ec8c6b | 56 | static struct { |
57 | char *pat; | |
d0c832f3 | 58 | int bugs; |
59 | } check[] = { | |
6a92533a | 60 | { "OpenSSH-2.0*," |
61 | "OpenSSH-2.1*," | |
62 | "OpenSSH_2.1*," | |
63 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
d2296ed7 | 64 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
65 | SSH_BUG_EXTEOF}, | |
6a92533a | 66 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
d2296ed7 | 67 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
68 | SSH_BUG_EXTEOF}, | |
6a92533a | 69 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
d2296ed7 | 70 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
6a92533a | 71 | { "OpenSSH_2.5.0p1*," |
72 | "OpenSSH_2.5.1p1*", | |
255cfda1 | 73 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
d2296ed7 | 74 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
6a92533a | 75 | { "OpenSSH_2.5.0*," |
76 | "OpenSSH_2.5.1*," | |
d2296ed7 | 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}, | |
6a92533a | 84 | { "OpenSSH*", 0 }, |
85 | { "*MindTerm*", 0 }, | |
86 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
a4da628b | 87 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
519bdfe8 | 88 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
89 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 90 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
a4da628b | 91 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
519bdfe8 | 92 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
93 | SSH_BUG_FIRSTKEX }, | |
184eed6a | 94 | { "2.0.13*," |
95 | "2.0.14*," | |
96 | "2.0.15*," | |
97 | "2.0.16*," | |
98 | "2.0.17*," | |
99 | "2.0.18*," | |
6a92533a | 100 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 101 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
fee56204 | 102 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
8dddf799 | 103 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| |
bcdb96c2 | 104 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| |
519bdfe8 | 105 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
184eed6a | 106 | { "2.0.11*," |
6a92533a | 107 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 108 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
109 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
a4da628b | 110 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
bcdb96c2 | 111 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
519bdfe8 | 112 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
6a92533a | 113 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
eef7adcb | 114 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
115 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
116 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
117 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
519bdfe8 | 118 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| |
119 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 120 | { "2.2.0*," |
121 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
519bdfe8 | 122 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, |
123 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| | |
124 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 125 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
519bdfe8 | 126 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, |
6a92533a | 127 | { "3.0.*", SSH_BUG_DEBUG }, |
128 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
129 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
130 | { "1.2.18*," | |
131 | "1.2.19*," | |
132 | "1.2.20*," | |
133 | "1.2.21*," | |
f8d99a32 | 134 | "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, |
135 | { "1.3.2*", /* F-Secure */ | |
136 | SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, | |
137 | { "1.2.1*," | |
138 | "1.2.2*," | |
139 | "1.2.3*", SSH_BUG_K5USER }, | |
6a92533a | 140 | { "*SSH Compatible Server*", /* Netscreen */ |
99c415db | 141 | SSH_BUG_PASSWORDPAD }, |
184eed6a | 142 | { "*OSU_0*," |
6a92533a | 143 | "OSU_1.0*," |
144 | "OSU_1.1*," | |
145 | "OSU_1.2*," | |
146 | "OSU_1.3*," | |
147 | "OSU_1.4*," | |
148 | "OSU_1.5alpha1*," | |
149 | "OSU_1.5alpha2*," | |
150 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
151 | { "*SSH_Version_Mapper*", | |
3a1c54d4 | 152 | SSH_BUG_SCANNER }, |
9a87e2ac | 153 | { "Probe-*", |
154 | SSH_BUG_PROBE }, | |
33de75a3 | 155 | { NULL, 0 } |
7e7327a1 | 156 | }; |
6a92533a | 157 | |
14a9a859 | 158 | /* process table, return first match */ |
94ec8c6b | 159 | for (i = 0; check[i].pat; i++) { |
6a92533a | 160 | if (match_pattern_list(version, check[i].pat, |
161 | strlen(check[i].pat), 0) == 1) { | |
13af0aa2 | 162 | debug("match: %s pat %s", version, check[i].pat); |
d0c832f3 | 163 | datafellows = check[i].bugs; |
7e7327a1 | 164 | return; |
165 | } | |
166 | } | |
94ec8c6b | 167 | debug("no match: %s", version); |
7e7327a1 | 168 | } |
a8be9f80 | 169 | |
170 | #define SEP "," | |
171 | int | |
172 | proto_spec(const char *spec) | |
173 | { | |
089fbbd2 | 174 | char *s, *p, *q; |
a8be9f80 | 175 | int ret = SSH_PROTO_UNKNOWN; |
176 | ||
71276795 | 177 | if (spec == NULL) |
178 | return ret; | |
089fbbd2 | 179 | q = s = xstrdup(spec); |
180 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
6aacefa7 | 181 | switch (atoi(p)) { |
a8be9f80 | 182 | case 1: |
183 | if (ret == SSH_PROTO_UNKNOWN) | |
184 | ret |= SSH_PROTO_1_PREFERRED; | |
185 | ret |= SSH_PROTO_1; | |
186 | break; | |
187 | case 2: | |
188 | ret |= SSH_PROTO_2; | |
189 | break; | |
190 | default: | |
191 | log("ignoring bad proto spec: '%s'.", p); | |
192 | break; | |
193 | } | |
194 | } | |
195 | xfree(s); | |
196 | return ret; | |
197 | } | |
80cd07ae | 198 | |
199 | char * | |
200 | compat_cipher_proposal(char *cipher_prop) | |
201 | { | |
3469eac4 | 202 | Buffer b; |
80cd07ae | 203 | char *orig_prop, *fix_ciphers; |
204 | char *cp, *tmp; | |
80cd07ae | 205 | |
206 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
207 | return(cipher_prop); | |
208 | ||
3469eac4 | 209 | buffer_init(&b); |
80cd07ae | 210 | tmp = orig_prop = xstrdup(cipher_prop); |
6aacefa7 | 211 | while ((cp = strsep(&tmp, ",")) != NULL) { |
55f9eebd | 212 | if (strncmp(cp, "aes", 3) != 0) { |
3469eac4 | 213 | if (buffer_len(&b) > 0) |
214 | buffer_append(&b, ",", 1); | |
215 | buffer_append(&b, cp, strlen(cp)); | |
80cd07ae | 216 | } |
217 | } | |
3469eac4 | 218 | buffer_append(&b, "\0", 1); |
219 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
220 | buffer_free(&b); | |
80cd07ae | 221 | xfree(orig_prop); |
222 | debug2("Original cipher proposal: %s", cipher_prop); | |
223 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
224 | if (!*fix_ciphers) | |
225 | fatal("No available ciphers found."); | |
226 | ||
227 | return(fix_ciphers); | |
228 | } |