Annotation of src/usr.bin/ssh/compat.c, Revision 1.41
1.5 markus 1: /*
1.23 markus 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"
1.41 ! markus 26: RCSID("$OpenBSD: compat.c,v 1.40 2001/03/23 11:04:06 djm Exp $");
1.34 markus 27:
28: #include <regex.h>
1.2 markus 29:
1.6 markus 30: #include "packet.h"
1.10 markus 31: #include "xmalloc.h"
32: #include "compat.h"
1.34 markus 33: #include "log.h"
1.1 markus 34:
1.4 markus 35: int compat13 = 0;
1.6 markus 36: int compat20 = 0;
37: int datafellows = 0;
1.4 markus 38:
1.11 markus 39: void
1.6 markus 40: enable_compat20(void)
41: {
1.7 markus 42: verbose("Enabling compatibility mode for protocol 2.0");
43: compat20 = 1;
1.6 markus 44: }
1.11 markus 45: void
1.4 markus 46: enable_compat13(void)
47: {
1.3 markus 48: verbose("Enabling compatibility mode for protocol 1.3");
1.4 markus 49: compat13 = 1;
1.6 markus 50: }
51: /* datafellows bug compatibility */
52: void
53: compat_datafellows(const char *version)
54: {
1.24 markus 55: int i, ret;
56: char ebuf[1024];
57: regex_t reg;
58: static struct {
59: char *pat;
1.13 markus 60: int bugs;
61: } check[] = {
1.33 markus 62: { "^OpenSSH[-_]2\\.[012]",
63: SSH_OLD_SESSIONID|SSH_BUG_BANNER },
1.40 djm 64: { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES },
65: { "^OpenSSH_2\\.5\\.[01]p1",
66: SSH_BUG_BIGENDIANAES },
1.33 markus 67: { "^OpenSSH", 0 },
1.25 markus 68: { "MindTerm", 0 },
1.29 markus 69: { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 ! markus 70: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
! 71: SSH_BUG_RSASIGMD5 },
1.36 markus 72: { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 ! markus 73: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
! 74: SSH_BUG_RSASIGMD5 },
1.28 markus 75: { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 76: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 77: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 ! markus 78: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5 },
1.25 markus 79: { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 80: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
81: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 ! markus 82: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
! 83: SSH_BUG_RSASIGMD5 },
! 84: { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 },
! 85: { "^2\\.3\\.", SSH_BUG_RSASIGMD5 },
1.25 markus 86: { "^2\\.[2-9]\\.", 0 },
1.38 deraadt 87: { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
88: { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
89: { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
90: { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
91: { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
92: { "^SSH Compatible Server", /* Netscreen */
93: SSH_BUG_PASSWORDPAD },
94: { "^OSU_0", SSH_BUG_PASSWORDPAD },
95: { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
96: { "^OSU_1\\.5alpha[1-3]",
97: SSH_BUG_PASSWORDPAD },
1.39 deraadt 98: { "^SSH_Version_Mapper",
99: SSH_BUG_SCANNER },
1.25 markus 100: { NULL, 0 }
1.6 markus 101: };
1.21 markus 102: /* process table, return first match */
1.24 markus 103: for (i = 0; check[i].pat; i++) {
104: ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
105: if (ret != 0) {
106: regerror(ret, ®, ebuf, sizeof(ebuf));
107: ebuf[sizeof(ebuf)-1] = '\0';
108: error("regerror: %s", ebuf);
109: continue;
110: }
111: ret = regexec(®, version, 0, NULL, 0);
112: regfree(®);
113: if (ret == 0) {
1.32 provos 114: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 115: datafellows = check[i].bugs;
1.6 markus 116: return;
117: }
118: }
1.24 markus 119: debug("no match: %s", version);
1.10 markus 120: }
121:
122: #define SEP ","
123: int
124: proto_spec(const char *spec)
125: {
1.18 provos 126: char *s, *p, *q;
1.10 markus 127: int ret = SSH_PROTO_UNKNOWN;
128:
1.14 markus 129: if (spec == NULL)
130: return ret;
1.18 provos 131: q = s = xstrdup(spec);
1.19 ho 132: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.10 markus 133: switch(atoi(p)) {
134: case 1:
135: if (ret == SSH_PROTO_UNKNOWN)
136: ret |= SSH_PROTO_1_PREFERRED;
137: ret |= SSH_PROTO_1;
138: break;
139: case 2:
140: ret |= SSH_PROTO_2;
141: break;
142: default:
143: log("ignoring bad proto spec: '%s'.", p);
144: break;
145: }
146: }
147: xfree(s);
148: return ret;
1.40 djm 149: }
150:
151: char *
152: compat_cipher_proposal(char *cipher_prop)
153: {
154: char *orig_prop, *fix_ciphers;
155: char *cp, *tmp;
156: size_t len;
157:
158: if (!(datafellows & SSH_BUG_BIGENDIANAES))
159: return(cipher_prop);
160:
161: len = strlen(cipher_prop) + 1;
162: fix_ciphers = xmalloc(len);
163: *fix_ciphers = '\0';
164: tmp = orig_prop = xstrdup(cipher_prop);
165: while((cp = strsep(&tmp, ",")) != NULL) {
166: if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
167: if (*fix_ciphers)
168: strlcat(fix_ciphers, ",", len);
169: strlcat(fix_ciphers, cp, len);
170: }
171: }
172: xfree(orig_prop);
173: debug2("Original cipher proposal: %s", cipher_prop);
174: debug2("Compat cipher proposal: %s", fix_ciphers);
175: if (!*fix_ciphers)
176: fatal("No available ciphers found.");
177:
178: return(fix_ciphers);
1.1 markus 179: }