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3c0ef626 | 1 | /* |
1e608e42 | 2 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
3c0ef626 | 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" | |
dfddba3d | 26 | RCSID("$OpenBSD: compat.c,v 1.71 2005/03/01 10:09:52 djm Exp $"); |
3c0ef626 | 27 | |
1e608e42 | 28 | #include "buffer.h" |
3c0ef626 | 29 | #include "packet.h" |
30 | #include "xmalloc.h" | |
31 | #include "compat.h" | |
32 | #include "log.h" | |
1e608e42 | 33 | #include "match.h" |
3c0ef626 | 34 | |
35 | int compat13 = 0; | |
36 | int compat20 = 0; | |
37 | int datafellows = 0; | |
38 | ||
39 | void | |
40 | enable_compat20(void) | |
41 | { | |
d03f4262 | 42 | debug("Enabling compatibility mode for protocol 2.0"); |
3c0ef626 | 43 | compat20 = 1; |
44 | } | |
45 | void | |
46 | enable_compat13(void) | |
47 | { | |
d03f4262 | 48 | debug("Enabling compatibility mode for protocol 1.3"); |
3c0ef626 | 49 | compat13 = 1; |
50 | } | |
51 | /* datafellows bug compatibility */ | |
52 | void | |
53 | compat_datafellows(const char *version) | |
54 | { | |
1e608e42 | 55 | int i; |
3c0ef626 | 56 | static struct { |
57 | char *pat; | |
58 | int bugs; | |
59 | } check[] = { | |
1e608e42 | 60 | { "OpenSSH-2.0*," |
61 | "OpenSSH-2.1*," | |
62 | "OpenSSH_2.1*," | |
63 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
510132b6 | 64 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
dfddba3d | 65 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
1e608e42 | 66 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
510132b6 | 67 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
dfddba3d | 68 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
1e608e42 | 69 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
dfddba3d | 70 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
71 | SSH_OLD_FORWARD_ADDR}, | |
1e608e42 | 72 | { "OpenSSH_2.5.0p1*," |
73 | "OpenSSH_2.5.1p1*", | |
3c0ef626 | 74 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
510132b6 | 75 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
dfddba3d | 76 | SSH_OLD_FORWARD_ADDR}, |
1e608e42 | 77 | { "OpenSSH_2.5.0*," |
78 | "OpenSSH_2.5.1*," | |
510132b6 | 79 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
dfddba3d | 80 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
81 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
82 | SSH_OLD_FORWARD_ADDR}, | |
510132b6 | 83 | { "OpenSSH_2.*," |
84 | "OpenSSH_3.0*," | |
dfddba3d | 85 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
86 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, | |
510132b6 | 87 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
1e608e42 | 88 | { "OpenSSH*", 0 }, |
89 | { "*MindTerm*", 0 }, | |
90 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
3c0ef626 | 91 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
bfe49944 | 92 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
93 | SSH_BUG_FIRSTKEX }, | |
1e608e42 | 94 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
3c0ef626 | 95 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
bfe49944 | 96 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
97 | SSH_BUG_FIRSTKEX }, | |
1e608e42 | 98 | { "2.0.13*," |
99 | "2.0.14*," | |
100 | "2.0.15*," | |
101 | "2.0.16*," | |
102 | "2.0.17*," | |
103 | "2.0.18*," | |
104 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
3c0ef626 | 105 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
106 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
107 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| | |
108 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| | |
bfe49944 | 109 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
1e608e42 | 110 | { "2.0.11*," |
111 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
3c0ef626 | 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| | |
bfe49944 | 116 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
1e608e42 | 117 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
3c0ef626 | 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| | |
bfe49944 | 122 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| |
123 | SSH_BUG_FIRSTKEX }, | |
1e608e42 | 124 | { "2.2.0*," |
125 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
bfe49944 | 126 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, |
127 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| | |
128 | SSH_BUG_FIRSTKEX }, | |
1e608e42 | 129 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
bfe49944 | 130 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, |
1e608e42 | 131 | { "3.0.*", SSH_BUG_DEBUG }, |
132 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
133 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
134 | { "1.2.18*," | |
135 | "1.2.19*," | |
136 | "1.2.20*," | |
137 | "1.2.21*," | |
7cac2b65 | 138 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
510132b6 | 139 | { "1.3.2*", /* F-Secure */ |
7cac2b65 | 140 | SSH_BUG_IGNOREMSG }, |
1e608e42 | 141 | { "*SSH Compatible Server*", /* Netscreen */ |
3c0ef626 | 142 | SSH_BUG_PASSWORDPAD }, |
1e608e42 | 143 | { "*OSU_0*," |
144 | "OSU_1.0*," | |
145 | "OSU_1.1*," | |
146 | "OSU_1.2*," | |
147 | "OSU_1.3*," | |
148 | "OSU_1.4*," | |
149 | "OSU_1.5alpha1*," | |
150 | "OSU_1.5alpha2*," | |
151 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
152 | { "*SSH_Version_Mapper*", | |
3c0ef626 | 153 | SSH_BUG_SCANNER }, |
d03f4262 | 154 | { "Probe-*", |
155 | SSH_BUG_PROBE }, | |
3c0ef626 | 156 | { NULL, 0 } |
157 | }; | |
1e608e42 | 158 | |
3c0ef626 | 159 | /* process table, return first match */ |
160 | for (i = 0; check[i].pat; i++) { | |
1e608e42 | 161 | if (match_pattern_list(version, check[i].pat, |
162 | strlen(check[i].pat), 0) == 1) { | |
3c0ef626 | 163 | debug("match: %s pat %s", version, check[i].pat); |
164 | datafellows = check[i].bugs; | |
473db5ab | 165 | /* Check to see if the remote side is OpenSSH and not HPN */ |
166 | if(strstr(version,"OpenSSH") != NULL) | |
167 | { | |
168 | if (strstr(version,"hpn") == NULL) | |
169 | { | |
170 | datafellows |= SSH_BUG_LARGEWINDOW; | |
171 | } | |
172 | } | |
3c0ef626 | 173 | return; |
174 | } | |
175 | } | |
176 | debug("no match: %s", version); | |
177 | } | |
178 | ||
179 | #define SEP "," | |
180 | int | |
181 | proto_spec(const char *spec) | |
182 | { | |
183 | char *s, *p, *q; | |
184 | int ret = SSH_PROTO_UNKNOWN; | |
185 | ||
186 | if (spec == NULL) | |
187 | return ret; | |
188 | q = s = xstrdup(spec); | |
189 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
1e608e42 | 190 | switch (atoi(p)) { |
3c0ef626 | 191 | case 1: |
192 | if (ret == SSH_PROTO_UNKNOWN) | |
193 | ret |= SSH_PROTO_1_PREFERRED; | |
194 | ret |= SSH_PROTO_1; | |
195 | break; | |
196 | case 2: | |
197 | ret |= SSH_PROTO_2; | |
198 | break; | |
199 | default: | |
7cac2b65 | 200 | logit("ignoring bad proto spec: '%s'.", p); |
3c0ef626 | 201 | break; |
202 | } | |
203 | } | |
204 | xfree(s); | |
205 | return ret; | |
206 | } | |
207 | ||
208 | char * | |
209 | compat_cipher_proposal(char *cipher_prop) | |
210 | { | |
1e608e42 | 211 | Buffer b; |
3c0ef626 | 212 | char *orig_prop, *fix_ciphers; |
213 | char *cp, *tmp; | |
3c0ef626 | 214 | |
215 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
216 | return(cipher_prop); | |
217 | ||
1e608e42 | 218 | buffer_init(&b); |
3c0ef626 | 219 | tmp = orig_prop = xstrdup(cipher_prop); |
1e608e42 | 220 | while ((cp = strsep(&tmp, ",")) != NULL) { |
221 | if (strncmp(cp, "aes", 3) != 0) { | |
222 | if (buffer_len(&b) > 0) | |
223 | buffer_append(&b, ",", 1); | |
224 | buffer_append(&b, cp, strlen(cp)); | |
3c0ef626 | 225 | } |
226 | } | |
1e608e42 | 227 | buffer_append(&b, "\0", 1); |
228 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
229 | buffer_free(&b); | |
3c0ef626 | 230 | xfree(orig_prop); |
231 | debug2("Original cipher proposal: %s", cipher_prop); | |
232 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
233 | if (!*fix_ciphers) | |
234 | fatal("No available ciphers found."); | |
235 | ||
236 | return(fix_ciphers); | |
237 | } |