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ffa517a8 | 1 | /* $OpenBSD: compat.c,v 1.75 2006/07/26 13:57:17 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 | |
ffa517a8 | 28 | #include <stdlib.h> |
00146caa | 29 | #include <string.h> |
30 | ||
3469eac4 | 31 | #include "buffer.h" |
42f11eb2 | 32 | #include "packet.h" |
33 | #include "xmalloc.h" | |
34 | #include "compat.h" | |
35 | #include "log.h" | |
6a92533a | 36 | #include "match.h" |
42f11eb2 | 37 | |
5260325f | 38 | int compat13 = 0; |
7e7327a1 | 39 | int compat20 = 0; |
40 | int datafellows = 0; | |
5260325f | 41 | |
6ae2364d | 42 | void |
7e7327a1 | 43 | enable_compat20(void) |
44 | { | |
f86b0eef | 45 | debug("Enabling compatibility mode for protocol 2.0"); |
8ce64345 | 46 | compat20 = 1; |
7e7327a1 | 47 | } |
6ae2364d | 48 | void |
5260325f | 49 | enable_compat13(void) |
50 | { | |
f86b0eef | 51 | debug("Enabling compatibility mode for protocol 1.3"); |
5260325f | 52 | compat13 = 1; |
8efc0c15 | 53 | } |
7e7327a1 | 54 | /* datafellows bug compatibility */ |
55 | void | |
56 | compat_datafellows(const char *version) | |
57 | { | |
6a92533a | 58 | int i; |
94ec8c6b | 59 | static struct { |
60 | char *pat; | |
d0c832f3 | 61 | int bugs; |
62 | } check[] = { | |
6a92533a | 63 | { "OpenSSH-2.0*," |
64 | "OpenSSH-2.1*," | |
65 | "OpenSSH_2.1*," | |
66 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
d2296ed7 | 67 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
3867aa0a | 68 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
6a92533a | 69 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
d2296ed7 | 70 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
3867aa0a | 71 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
6a92533a | 72 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
3867aa0a | 73 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
74 | SSH_OLD_FORWARD_ADDR}, | |
6a92533a | 75 | { "OpenSSH_2.5.0p1*," |
76 | "OpenSSH_2.5.1p1*", | |
255cfda1 | 77 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
3867aa0a | 78 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
79 | SSH_OLD_FORWARD_ADDR}, | |
6a92533a | 80 | { "OpenSSH_2.5.0*," |
81 | "OpenSSH_2.5.1*," | |
d2296ed7 | 82 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
3867aa0a | 83 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
84 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
85 | SSH_OLD_FORWARD_ADDR}, | |
d2296ed7 | 86 | { "OpenSSH_2.*," |
87 | "OpenSSH_3.0*," | |
3867aa0a | 88 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
89 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, | |
d2296ed7 | 90 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
6a92533a | 91 | { "OpenSSH*", 0 }, |
92 | { "*MindTerm*", 0 }, | |
93 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
a4da628b | 94 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
519bdfe8 | 95 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
96 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 97 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
a4da628b | 98 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
519bdfe8 | 99 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
100 | SSH_BUG_FIRSTKEX }, | |
184eed6a | 101 | { "2.0.13*," |
102 | "2.0.14*," | |
103 | "2.0.15*," | |
104 | "2.0.16*," | |
105 | "2.0.17*," | |
106 | "2.0.18*," | |
6a92533a | 107 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 108 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
fee56204 | 109 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
8dddf799 | 110 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| |
bcdb96c2 | 111 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| |
519bdfe8 | 112 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
184eed6a | 113 | { "2.0.11*," |
6a92533a | 114 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 115 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
116 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
a4da628b | 117 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
bcdb96c2 | 118 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
519bdfe8 | 119 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
6a92533a | 120 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
eef7adcb | 121 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
122 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
123 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| | |
124 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| | |
519bdfe8 | 125 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| |
126 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 127 | { "2.2.0*," |
128 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
519bdfe8 | 129 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, |
130 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| | |
131 | SSH_BUG_FIRSTKEX }, | |
6a92533a | 132 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
519bdfe8 | 133 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, |
6a92533a | 134 | { "3.0.*", SSH_BUG_DEBUG }, |
135 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
136 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
137 | { "1.2.18*," | |
138 | "1.2.19*," | |
139 | "1.2.20*," | |
140 | "1.2.21*," | |
e3e69949 | 141 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
f8d99a32 | 142 | { "1.3.2*", /* F-Secure */ |
e3e69949 | 143 | SSH_BUG_IGNOREMSG }, |
6a92533a | 144 | { "*SSH Compatible Server*", /* Netscreen */ |
99c415db | 145 | SSH_BUG_PASSWORDPAD }, |
184eed6a | 146 | { "*OSU_0*," |
6a92533a | 147 | "OSU_1.0*," |
148 | "OSU_1.1*," | |
149 | "OSU_1.2*," | |
150 | "OSU_1.3*," | |
151 | "OSU_1.4*," | |
152 | "OSU_1.5alpha1*," | |
153 | "OSU_1.5alpha2*," | |
154 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
155 | { "*SSH_Version_Mapper*", | |
3a1c54d4 | 156 | SSH_BUG_SCANNER }, |
9a87e2ac | 157 | { "Probe-*", |
158 | SSH_BUG_PROBE }, | |
33de75a3 | 159 | { NULL, 0 } |
7e7327a1 | 160 | }; |
6a92533a | 161 | |
14a9a859 | 162 | /* process table, return first match */ |
94ec8c6b | 163 | for (i = 0; check[i].pat; i++) { |
6a92533a | 164 | if (match_pattern_list(version, check[i].pat, |
165 | strlen(check[i].pat), 0) == 1) { | |
13af0aa2 | 166 | debug("match: %s pat %s", version, check[i].pat); |
d0c832f3 | 167 | datafellows = check[i].bugs; |
7e7327a1 | 168 | return; |
169 | } | |
170 | } | |
94ec8c6b | 171 | debug("no match: %s", version); |
7e7327a1 | 172 | } |
a8be9f80 | 173 | |
174 | #define SEP "," | |
175 | int | |
176 | proto_spec(const char *spec) | |
177 | { | |
089fbbd2 | 178 | char *s, *p, *q; |
a8be9f80 | 179 | int ret = SSH_PROTO_UNKNOWN; |
180 | ||
71276795 | 181 | if (spec == NULL) |
182 | return ret; | |
089fbbd2 | 183 | q = s = xstrdup(spec); |
184 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
6aacefa7 | 185 | switch (atoi(p)) { |
a8be9f80 | 186 | case 1: |
187 | if (ret == SSH_PROTO_UNKNOWN) | |
188 | ret |= SSH_PROTO_1_PREFERRED; | |
189 | ret |= SSH_PROTO_1; | |
190 | break; | |
191 | case 2: | |
192 | ret |= SSH_PROTO_2; | |
193 | break; | |
194 | default: | |
bbe88b6d | 195 | logit("ignoring bad proto spec: '%s'.", p); |
a8be9f80 | 196 | break; |
197 | } | |
198 | } | |
199 | xfree(s); | |
200 | return ret; | |
201 | } | |
80cd07ae | 202 | |
203 | char * | |
204 | compat_cipher_proposal(char *cipher_prop) | |
205 | { | |
3469eac4 | 206 | Buffer b; |
80cd07ae | 207 | char *orig_prop, *fix_ciphers; |
208 | char *cp, *tmp; | |
80cd07ae | 209 | |
210 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
211 | return(cipher_prop); | |
212 | ||
3469eac4 | 213 | buffer_init(&b); |
80cd07ae | 214 | tmp = orig_prop = xstrdup(cipher_prop); |
6aacefa7 | 215 | while ((cp = strsep(&tmp, ",")) != NULL) { |
55f9eebd | 216 | if (strncmp(cp, "aes", 3) != 0) { |
3469eac4 | 217 | if (buffer_len(&b) > 0) |
218 | buffer_append(&b, ",", 1); | |
219 | buffer_append(&b, cp, strlen(cp)); | |
80cd07ae | 220 | } |
221 | } | |
3469eac4 | 222 | buffer_append(&b, "\0", 1); |
223 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
224 | buffer_free(&b); | |
80cd07ae | 225 | xfree(orig_prop); |
226 | debug2("Original cipher proposal: %s", cipher_prop); | |
227 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
228 | if (!*fix_ciphers) | |
229 | fatal("No available ciphers found."); | |
230 | ||
231 | return(fix_ciphers); | |
232 | } |