Annotation of src/usr.bin/ssh/compat.c, Revision 1.13.2.3
1.5 markus 1: /*
1.13.2.3! jason 2: * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
1.5 markus 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:
1.1 markus 25: #include "includes.h"
1.13.2.3! jason 26: RCSID("$OpenBSD: compat.c,v 1.27 2000/10/31 09:31:58 markus Exp $");
1.2 markus 27:
1.1 markus 28: #include "ssh.h"
1.6 markus 29: #include "packet.h"
1.10 markus 30: #include "xmalloc.h"
31: #include "compat.h"
1.13.2.3! jason 32: #include <regex.h>
1.1 markus 33:
1.4 markus 34: int compat13 = 0;
1.6 markus 35: int compat20 = 0;
36: int datafellows = 0;
1.4 markus 37:
1.11 markus 38: void
1.6 markus 39: enable_compat20(void)
40: {
1.7 markus 41: verbose("Enabling compatibility mode for protocol 2.0");
42: compat20 = 1;
1.6 markus 43: }
1.11 markus 44: void
1.4 markus 45: enable_compat13(void)
46: {
1.3 markus 47: verbose("Enabling compatibility mode for protocol 1.3");
1.4 markus 48: compat13 = 1;
1.6 markus 49: }
50: /* datafellows bug compatibility */
51: void
52: compat_datafellows(const char *version)
53: {
1.13.2.3! jason 54: int i, ret;
! 55: char ebuf[1024];
! 56: regex_t reg;
! 57: static struct {
! 58: char *pat;
1.13 markus 59: int bugs;
60: } check[] = {
1.13.2.3! jason 61: { "^OpenSSH[-_]2\\.[012]", SSH_OLD_SESSIONID },
! 62: { "MindTerm", 0 },
! 63: { "^2\\.1\\.0 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
! 64: SSH_OLD_SESSIONID },
! 65: { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
! 66: SSH_OLD_SESSIONID|
! 67: SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD },
! 68: { "^2\\.[23]\\.0 ", SSH_BUG_HMAC},
! 69: { "^2\\.[2-9]\\.", 0 },
! 70: { "^2\\.4$", SSH_OLD_SESSIONID}, /* Van Dyke */
! 71: { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID},
! 72: { "^1\\.7 SecureFX", SSH_OLD_SESSIONID},
! 73: { "^2\\.", SSH_BUG_HMAC}, /* XXX fallback */
! 74: { NULL, 0 }
1.6 markus 75: };
1.13.2.2 jason 76: /* process table, return first match */
1.13.2.3! jason 77: for (i = 0; check[i].pat; i++) {
! 78: ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
! 79: if (ret != 0) {
! 80: regerror(ret, ®, ebuf, sizeof(ebuf));
! 81: ebuf[sizeof(ebuf)-1] = '\0';
! 82: error("regerror: %s", ebuf);
! 83: continue;
! 84: }
! 85: ret = regexec(®, version, 0, NULL, 0);
! 86: regfree(®);
! 87: if (ret == 0) {
! 88: debug("match: %s pat %s\n", version, check[i].pat);
1.13 markus 89: datafellows = check[i].bugs;
1.6 markus 90: return;
91: }
92: }
1.13.2.3! jason 93: debug("no match: %s", version);
1.10 markus 94: }
95:
96: #define SEP ","
97: int
98: proto_spec(const char *spec)
99: {
1.13.2.2 jason 100: char *s, *p, *q;
1.10 markus 101: int ret = SSH_PROTO_UNKNOWN;
102:
1.13.2.1 jason 103: if (spec == NULL)
104: return ret;
1.13.2.2 jason 105: q = s = xstrdup(spec);
106: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.10 markus 107: switch(atoi(p)) {
108: case 1:
109: if (ret == SSH_PROTO_UNKNOWN)
110: ret |= SSH_PROTO_1_PREFERRED;
111: ret |= SSH_PROTO_1;
112: break;
113: case 2:
114: ret |= SSH_PROTO_2;
115: break;
116: default:
117: log("ignoring bad proto spec: '%s'.", p);
118: break;
119: }
120: }
121: xfree(s);
122: return ret;
1.1 markus 123: }
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