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00146caa | 1 | /* $OpenBSD: compat.c,v 1.74 2006/07/22 20:48:23 stevesk Exp $ */ |
aa3378df | 2 | /* |
dbe426a1 | 3 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
aa3378df | 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. | |
aa3378df | 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 | ||
8efc0c15 | 26 | #include "includes.h" |
8efc0c15 | 27 | |
00146caa | 28 | #include <string.h> |
29 | ||
3469eac4 | 30 | #include "buffer.h" |
42f11eb2 | 31 | #include "packet.h" |
32 | #include "xmalloc.h" | |
33 | #include "compat.h" | |
34 | #include "log.h" | |
6a92533a | 35 | #include "match.h" |
42f11eb2 | 36 | |
5260325f | 37 | int compat13 = 0; |
7e7327a1 | 38 | int compat20 = 0; |
39 | int datafellows = 0; | |
5260325f | 40 | |
6ae2364d | 41 | void |
7e7327a1 | 42 | enable_compat20(void) |
43 | { | |
f86b0eef | 44 | debug("Enabling compatibility mode for protocol 2.0"); |
8ce64345 | 45 | compat20 = 1; |
7e7327a1 | 46 | } |
6ae2364d | 47 | void |
5260325f | 48 | enable_compat13(void) |
49 | { | |
f86b0eef | 50 | debug("Enabling compatibility mode for protocol 1.3"); |
5260325f | 51 | compat13 = 1; |
8efc0c15 | 52 | } |
7e7327a1 | 53 | /* datafellows bug compatibility */ |
54 | void | |
55 | compat_datafellows(const char *version) | |
56 | { | |
6a92533a | 57 | int i; |
94ec8c6b | 58 | static struct { |
59 | char *pat; | |
d0c832f3 | 60 | int bugs; |
61 | } check[] = { | |
6a92533a | 62 | { "OpenSSH-2.0*," |
63 | "OpenSSH-2.1*," | |
64 | "OpenSSH_2.1*," | |
65 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
d2296ed7 | 66 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
3867aa0a | 67 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
6a92533a | 68 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
d2296ed7 | 69 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
3867aa0a | 70 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
6a92533a | 71 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
3867aa0a | 72 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
73 | SSH_OLD_FORWARD_ADDR}, | |
6a92533a | 74 | { "OpenSSH_2.5.0p1*," |
75 | "OpenSSH_2.5.1p1*", | |
255cfda1 | 76 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
3867aa0a | 77 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
78 | SSH_OLD_FORWARD_ADDR}, | |
6a92533a | 79 | { "OpenSSH_2.5.0*," |
80 | "OpenSSH_2.5.1*," | |
d2296ed7 | 81 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
3867aa0a | 82 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
83 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
84 | SSH_OLD_FORWARD_ADDR}, | |
d2296ed7 | 85 | { "OpenSSH_2.*," |
86 | "OpenSSH_3.0*," | |
3867aa0a | 87 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
88 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, | |
d2296ed7 | 89 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
6a92533a | 90 | { "OpenSSH*", 0 }, |
91 | { "*MindTerm*", 0 }, | |
92 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
a4da628b | 93 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
519bdfe8 | 94 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
95 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 96 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
a4da628b | 97 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
519bdfe8 | 98 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
99 | SSH_BUG_FIRSTKEX }, | |
184eed6a | 100 | { "2.0.13*," |
101 | "2.0.14*," | |
102 | "2.0.15*," | |
103 | "2.0.16*," | |
104 | "2.0.17*," | |
105 | "2.0.18*," | |
6a92533a | 106 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 107 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
fee56204 | 108 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
8dddf799 | 109 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| |
bcdb96c2 | 110 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| |
519bdfe8 | 111 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
184eed6a | 112 | { "2.0.11*," |
6a92533a | 113 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 114 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
115 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
a4da628b | 116 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
bcdb96c2 | 117 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
519bdfe8 | 118 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
6a92533a | 119 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
eef7adcb | 120 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
121 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
122 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
123 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
519bdfe8 | 124 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| |
125 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 126 | { "2.2.0*," |
127 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
519bdfe8 | 128 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, |
129 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| | |
130 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 131 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
519bdfe8 | 132 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, |
6a92533a | 133 | { "3.0.*", SSH_BUG_DEBUG }, |
134 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
135 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
136 | { "1.2.18*," | |
137 | "1.2.19*," | |
138 | "1.2.20*," | |
139 | "1.2.21*," | |
e3e69949 | 140 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
f8d99a32 | 141 | { "1.3.2*", /* F-Secure */ |
e3e69949 | 142 | SSH_BUG_IGNOREMSG }, |
6a92533a | 143 | { "*SSH Compatible Server*", /* Netscreen */ |
99c415db | 144 | SSH_BUG_PASSWORDPAD }, |
184eed6a | 145 | { "*OSU_0*," |
6a92533a | 146 | "OSU_1.0*," |
147 | "OSU_1.1*," | |
148 | "OSU_1.2*," | |
149 | "OSU_1.3*," | |
150 | "OSU_1.4*," | |
151 | "OSU_1.5alpha1*," | |
152 | "OSU_1.5alpha2*," | |
153 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
154 | { "*SSH_Version_Mapper*", | |
3a1c54d4 | 155 | SSH_BUG_SCANNER }, |
9a87e2ac | 156 | { "Probe-*", |
157 | SSH_BUG_PROBE }, | |
33de75a3 | 158 | { NULL, 0 } |
7e7327a1 | 159 | }; |
6a92533a | 160 | |
14a9a859 | 161 | /* process table, return first match */ |
94ec8c6b | 162 | for (i = 0; check[i].pat; i++) { |
6a92533a | 163 | if (match_pattern_list(version, check[i].pat, |
164 | strlen(check[i].pat), 0) == 1) { | |
13af0aa2 | 165 | debug("match: %s pat %s", version, check[i].pat); |
d0c832f3 | 166 | datafellows = check[i].bugs; |
7e7327a1 | 167 | return; |
168 | } | |
169 | } | |
94ec8c6b | 170 | debug("no match: %s", version); |
7e7327a1 | 171 | } |
a8be9f80 | 172 | |
173 | #define SEP "," | |
174 | int | |
175 | proto_spec(const char *spec) | |
176 | { | |
089fbbd2 | 177 | char *s, *p, *q; |
a8be9f80 | 178 | int ret = SSH_PROTO_UNKNOWN; |
179 | ||
71276795 | 180 | if (spec == NULL) |
181 | return ret; | |
089fbbd2 | 182 | q = s = xstrdup(spec); |
183 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
6aacefa7 | 184 | switch (atoi(p)) { |
a8be9f80 | 185 | case 1: |
186 | if (ret == SSH_PROTO_UNKNOWN) | |
187 | ret |= SSH_PROTO_1_PREFERRED; | |
188 | ret |= SSH_PROTO_1; | |
189 | break; | |
190 | case 2: | |
191 | ret |= SSH_PROTO_2; | |
192 | break; | |
193 | default: | |
bbe88b6d | 194 | logit("ignoring bad proto spec: '%s'.", p); |
a8be9f80 | 195 | break; |
196 | } | |
197 | } | |
198 | xfree(s); | |
199 | return ret; | |
200 | } | |
80cd07ae | 201 | |
202 | char * | |
203 | compat_cipher_proposal(char *cipher_prop) | |
204 | { | |
3469eac4 | 205 | Buffer b; |
80cd07ae | 206 | char *orig_prop, *fix_ciphers; |
207 | char *cp, *tmp; | |
80cd07ae | 208 | |
209 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
210 | return(cipher_prop); | |
211 | ||
3469eac4 | 212 | buffer_init(&b); |
80cd07ae | 213 | tmp = orig_prop = xstrdup(cipher_prop); |
6aacefa7 | 214 | while ((cp = strsep(&tmp, ",")) != NULL) { |
55f9eebd | 215 | if (strncmp(cp, "aes", 3) != 0) { |
3469eac4 | 216 | if (buffer_len(&b) > 0) |
217 | buffer_append(&b, ",", 1); | |
218 | buffer_append(&b, cp, strlen(cp)); | |
80cd07ae | 219 | } |
220 | } | |
3469eac4 | 221 | buffer_append(&b, "\0", 1); |
222 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
223 | buffer_free(&b); | |
80cd07ae | 224 | xfree(orig_prop); |
225 | debug2("Original cipher proposal: %s", cipher_prop); | |
226 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
227 | if (!*fix_ciphers) | |
228 | fatal("No available ciphers found."); | |
229 | ||
230 | return(fix_ciphers); | |
231 | } |