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aa3378df | 1 | /* |
bcbf86ec | 2 | * Copyright (c) 1999,2000 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" |
b35eb612 | 26 | RCSID("$OpenBSD: compat.c,v 1.34 2001/01/21 19:05:48 markus Exp $"); |
8efc0c15 | 27 | |
66d6c27e | 28 | #ifdef HAVE_LIBPCRE |
29 | # include <pcreposix.h> | |
d8f1edd5 | 30 | #else /* Use native regex libraries */ |
47af6577 | 31 | # ifdef HAVE_REGEX_H |
32 | # include <regex.h> | |
33 | # else | |
c623936e | 34 | # include "fake-regex.h" |
47af6577 | 35 | # endif |
bc6bf501 | 36 | #endif /* HAVE_LIBPCRE */ |
8efc0c15 | 37 | |
42f11eb2 | 38 | #include "packet.h" |
39 | #include "xmalloc.h" | |
40 | #include "compat.h" | |
41 | #include "log.h" | |
42 | ||
5260325f | 43 | int compat13 = 0; |
7e7327a1 | 44 | int compat20 = 0; |
45 | int datafellows = 0; | |
5260325f | 46 | |
6ae2364d | 47 | void |
7e7327a1 | 48 | enable_compat20(void) |
49 | { | |
8ce64345 | 50 | verbose("Enabling compatibility mode for protocol 2.0"); |
51 | compat20 = 1; | |
7e7327a1 | 52 | } |
6ae2364d | 53 | void |
5260325f | 54 | enable_compat13(void) |
55 | { | |
56 | verbose("Enabling compatibility mode for protocol 1.3"); | |
57 | compat13 = 1; | |
8efc0c15 | 58 | } |
7e7327a1 | 59 | /* datafellows bug compatibility */ |
60 | void | |
61 | compat_datafellows(const char *version) | |
62 | { | |
94ec8c6b | 63 | int i, ret; |
64 | char ebuf[1024]; | |
65 | regex_t reg; | |
66 | static struct { | |
67 | char *pat; | |
d0c832f3 | 68 | int bugs; |
69 | } check[] = { | |
eea39c02 | 70 | { "^OpenSSH[-_]2\\.[012]", |
71 | SSH_OLD_SESSIONID|SSH_BUG_BANNER }, | |
72 | { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER }, | |
73 | { "^OpenSSH", 0 }, | |
33de75a3 | 74 | { "MindTerm", 0 }, |
cbc5abf9 | 75 | { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 76 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG }, |
cbc5abf9 | 77 | { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
f72fc97f | 78 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
cbc5abf9 | 79 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD }, |
80 | { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| | |
f72fc97f | 81 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
82 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| | |
83 | SSH_BUG_PKAUTH }, | |
cbc5abf9 | 84 | { "^2\\.[23]\\.0", SSH_BUG_HMAC}, |
33de75a3 | 85 | { "^2\\.[2-9]\\.", 0 }, |
a22aff1f | 86 | { "^2\\.4$", SSH_OLD_SESSIONID}, /* Van Dyke */ |
87 | { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID}, | |
88 | { "^1\\.7 SecureFX", SSH_OLD_SESSIONID}, | |
33de75a3 | 89 | { NULL, 0 } |
7e7327a1 | 90 | }; |
14a9a859 | 91 | /* process table, return first match */ |
94ec8c6b | 92 | for (i = 0; check[i].pat; i++) { |
93 | ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB); | |
94 | if (ret != 0) { | |
95 | regerror(ret, ®, ebuf, sizeof(ebuf)); | |
96 | ebuf[sizeof(ebuf)-1] = '\0'; | |
97 | error("regerror: %s", ebuf); | |
98 | continue; | |
99 | } | |
100 | ret = regexec(®, version, 0, NULL, 0); | |
101 | regfree(®); | |
102 | if (ret == 0) { | |
13af0aa2 | 103 | debug("match: %s pat %s", version, check[i].pat); |
d0c832f3 | 104 | datafellows = check[i].bugs; |
7e7327a1 | 105 | return; |
106 | } | |
107 | } | |
94ec8c6b | 108 | debug("no match: %s", version); |
7e7327a1 | 109 | } |
a8be9f80 | 110 | |
111 | #define SEP "," | |
112 | int | |
113 | proto_spec(const char *spec) | |
114 | { | |
089fbbd2 | 115 | char *s, *p, *q; |
a8be9f80 | 116 | int ret = SSH_PROTO_UNKNOWN; |
117 | ||
71276795 | 118 | if (spec == NULL) |
119 | return ret; | |
089fbbd2 | 120 | q = s = xstrdup(spec); |
121 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
a8be9f80 | 122 | switch(atoi(p)) { |
123 | case 1: | |
124 | if (ret == SSH_PROTO_UNKNOWN) | |
125 | ret |= SSH_PROTO_1_PREFERRED; | |
126 | ret |= SSH_PROTO_1; | |
127 | break; | |
128 | case 2: | |
129 | ret |= SSH_PROTO_2; | |
130 | break; | |
131 | default: | |
132 | log("ignoring bad proto spec: '%s'.", p); | |
133 | break; | |
134 | } | |
135 | } | |
136 | xfree(s); | |
137 | return ret; | |
138 | } |