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2e437378 | 1 | /* $OpenBSD: compat.c,v 1.76 2006/08/03 03:34:42 deraadt Exp $ */ |
3c0ef626 | 2 | /* |
e9a17296 | 3 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
3c0ef626 | 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" | |
3c0ef626 | 27 | |
2e437378 | 28 | #include <sys/types.h> |
29 | ||
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <stdarg.h> | |
33 | ||
34 | #include "xmalloc.h" | |
e9a17296 | 35 | #include "buffer.h" |
3c0ef626 | 36 | #include "packet.h" |
3c0ef626 | 37 | #include "compat.h" |
38 | #include "log.h" | |
e9a17296 | 39 | #include "match.h" |
3c0ef626 | 40 | |
41 | int compat13 = 0; | |
42 | int compat20 = 0; | |
43 | int datafellows = 0; | |
44 | ||
45 | void | |
46 | enable_compat20(void) | |
47 | { | |
e54b3d7c | 48 | debug("Enabling compatibility mode for protocol 2.0"); |
3c0ef626 | 49 | compat20 = 1; |
50 | } | |
51 | void | |
52 | enable_compat13(void) | |
53 | { | |
e54b3d7c | 54 | debug("Enabling compatibility mode for protocol 1.3"); |
3c0ef626 | 55 | compat13 = 1; |
56 | } | |
57 | /* datafellows bug compatibility */ | |
58 | void | |
59 | compat_datafellows(const char *version) | |
60 | { | |
e9a17296 | 61 | int i; |
3c0ef626 | 62 | static struct { |
63 | char *pat; | |
64 | int bugs; | |
65 | } check[] = { | |
e9a17296 | 66 | { "OpenSSH-2.0*," |
67 | "OpenSSH-2.1*," | |
68 | "OpenSSH_2.1*," | |
69 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| | |
2980ea68 | 70 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
34fee935 | 71 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
e9a17296 | 72 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
2980ea68 | 73 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
34fee935 | 74 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
e9a17296 | 75 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
34fee935 | 76 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
77 | SSH_OLD_FORWARD_ADDR}, | |
e9a17296 | 78 | { "OpenSSH_2.5.0p1*," |
79 | "OpenSSH_2.5.1p1*", | |
3c0ef626 | 80 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
2980ea68 | 81 | SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| |
34fee935 | 82 | SSH_OLD_FORWARD_ADDR}, |
e9a17296 | 83 | { "OpenSSH_2.5.0*," |
84 | "OpenSSH_2.5.1*," | |
2980ea68 | 85 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| |
34fee935 | 86 | SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
87 | { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| | |
88 | SSH_OLD_FORWARD_ADDR}, | |
2980ea68 | 89 | { "OpenSSH_2.*," |
90 | "OpenSSH_3.0*," | |
34fee935 | 91 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
92 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, | |
2980ea68 | 93 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
e9a17296 | 94 | { "OpenSSH*", 0 }, |
95 | { "*MindTerm*", 0 }, | |
96 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
3c0ef626 | 97 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
1c14df9e | 98 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
99 | SSH_BUG_FIRSTKEX }, | |
e9a17296 | 100 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
3c0ef626 | 101 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
1c14df9e | 102 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| |
103 | SSH_BUG_FIRSTKEX }, | |
e9a17296 | 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| | |
3c0ef626 | 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| | |
1c14df9e | 115 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
e9a17296 | 116 | { "2.0.11*," |
117 | "2.0.12*", 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| | |
1c14df9e | 122 | SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, |
e9a17296 | 123 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
3c0ef626 | 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| | |
1c14df9e | 128 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| |
129 | SSH_BUG_FIRSTKEX }, | |
e9a17296 | 130 | { "2.2.0*," |
131 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| | |
1c14df9e | 132 | SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, |
133 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| | |
134 | SSH_BUG_FIRSTKEX }, | |
e9a17296 | 135 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
1c14df9e | 136 | { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, |
e9a17296 | 137 | { "3.0.*", SSH_BUG_DEBUG }, |
138 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, | |
139 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, | |
140 | { "1.2.18*," | |
141 | "1.2.19*," | |
142 | "1.2.20*," | |
143 | "1.2.21*," | |
70791e56 | 144 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
2980ea68 | 145 | { "1.3.2*", /* F-Secure */ |
70791e56 | 146 | SSH_BUG_IGNOREMSG }, |
e9a17296 | 147 | { "*SSH Compatible Server*", /* Netscreen */ |
3c0ef626 | 148 | SSH_BUG_PASSWORDPAD }, |
e9a17296 | 149 | { "*OSU_0*," |
150 | "OSU_1.0*," | |
151 | "OSU_1.1*," | |
152 | "OSU_1.2*," | |
153 | "OSU_1.3*," | |
154 | "OSU_1.4*," | |
155 | "OSU_1.5alpha1*," | |
156 | "OSU_1.5alpha2*," | |
157 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, | |
158 | { "*SSH_Version_Mapper*", | |
3c0ef626 | 159 | SSH_BUG_SCANNER }, |
e54b3d7c | 160 | { "Probe-*", |
161 | SSH_BUG_PROBE }, | |
3c0ef626 | 162 | { NULL, 0 } |
163 | }; | |
e9a17296 | 164 | |
3c0ef626 | 165 | /* process table, return first match */ |
166 | for (i = 0; check[i].pat; i++) { | |
e9a17296 | 167 | if (match_pattern_list(version, check[i].pat, |
168 | strlen(check[i].pat), 0) == 1) { | |
3c0ef626 | 169 | debug("match: %s pat %s", version, check[i].pat); |
170 | datafellows = check[i].bugs; | |
34fee935 | 171 | /* Check to see if the remote side is OpenSSH and not HPN */ |
172 | if(strstr(version,"OpenSSH") != NULL) | |
173 | { | |
174 | if (strstr(version,"hpn") == NULL) | |
175 | { | |
176 | datafellows |= SSH_BUG_LARGEWINDOW; | |
2e437378 | 177 | debug("Remote is NON-HPN aware"); |
34fee935 | 178 | } |
179 | } | |
3c0ef626 | 180 | return; |
181 | } | |
182 | } | |
183 | debug("no match: %s", version); | |
184 | } | |
185 | ||
186 | #define SEP "," | |
187 | int | |
188 | proto_spec(const char *spec) | |
189 | { | |
190 | char *s, *p, *q; | |
191 | int ret = SSH_PROTO_UNKNOWN; | |
192 | ||
193 | if (spec == NULL) | |
194 | return ret; | |
195 | q = s = xstrdup(spec); | |
196 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
e9a17296 | 197 | switch (atoi(p)) { |
3c0ef626 | 198 | case 1: |
199 | if (ret == SSH_PROTO_UNKNOWN) | |
200 | ret |= SSH_PROTO_1_PREFERRED; | |
201 | ret |= SSH_PROTO_1; | |
202 | break; | |
203 | case 2: | |
204 | ret |= SSH_PROTO_2; | |
205 | break; | |
206 | default: | |
70791e56 | 207 | logit("ignoring bad proto spec: '%s'.", p); |
3c0ef626 | 208 | break; |
209 | } | |
210 | } | |
211 | xfree(s); | |
212 | return ret; | |
213 | } | |
214 | ||
215 | char * | |
216 | compat_cipher_proposal(char *cipher_prop) | |
217 | { | |
e9a17296 | 218 | Buffer b; |
3c0ef626 | 219 | char *orig_prop, *fix_ciphers; |
220 | char *cp, *tmp; | |
3c0ef626 | 221 | |
222 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) | |
223 | return(cipher_prop); | |
224 | ||
e9a17296 | 225 | buffer_init(&b); |
3c0ef626 | 226 | tmp = orig_prop = xstrdup(cipher_prop); |
e9a17296 | 227 | while ((cp = strsep(&tmp, ",")) != NULL) { |
228 | if (strncmp(cp, "aes", 3) != 0) { | |
229 | if (buffer_len(&b) > 0) | |
230 | buffer_append(&b, ",", 1); | |
231 | buffer_append(&b, cp, strlen(cp)); | |
3c0ef626 | 232 | } |
233 | } | |
e9a17296 | 234 | buffer_append(&b, "\0", 1); |
235 | fix_ciphers = xstrdup(buffer_ptr(&b)); | |
236 | buffer_free(&b); | |
3c0ef626 | 237 | xfree(orig_prop); |
238 | debug2("Original cipher proposal: %s", cipher_prop); | |
239 | debug2("Compat cipher proposal: %s", fix_ciphers); | |
240 | if (!*fix_ciphers) | |
241 | fatal("No available ciphers found."); | |
242 | ||
243 | return(fix_ciphers); | |
244 | } |