Annotation of src/usr.bin/ssh/compat.c, Revision 1.55
1.5 markus 1: /*
1.51 markus 2: * Copyright (c) 1999, 2000, 2001 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"
1.55 ! markus 26: RCSID("$OpenBSD: compat.c,v 1.54 2001/12/05 10:06:12 deraadt Exp $");
1.2 markus 27:
1.6 markus 28: #include "packet.h"
1.10 markus 29: #include "xmalloc.h"
30: #include "compat.h"
1.34 markus 31: #include "log.h"
1.55 ! markus 32: #include "match.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: {
1.55 ! markus 54: int i;
1.24 markus 55: static struct {
56: char *pat;
1.13 markus 57: int bugs;
58: } check[] = {
1.55 ! markus 59: { "OpenSSH-2.0*,"
! 60: "OpenSSH-2.1*,"
! 61: "OpenSSH_2.1*,"
! 62: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.45 markus 63: SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
1.55 ! markus 64: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.45 markus 65: SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
1.55 ! markus 66: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.45 markus 67: SSH_BUG_NOREKEY},
1.55 ! markus 68: { "OpenSSH_2.5.0p1*,"
! 69: "OpenSSH_2.5.1p1*",
1.45 markus 70: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
71: SSH_BUG_NOREKEY },
1.55 ! markus 72: { "OpenSSH_2.5.0*,"
! 73: "OpenSSH_2.5.1*,"
! 74: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
! 75: { "OpenSSH_2.5.3*",
1.45 markus 76: SSH_BUG_NOREKEY },
1.55 ! markus 77: { "OpenSSH*", 0 },
! 78: { "*MindTerm*", 0 },
! 79: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 80: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.46 markus 81: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.55 ! markus 82: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 83: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.46 markus 84: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.55 ! markus 85: { "2.0.13*,"
! 86: "2.0.14*,"
! 87: "2.0.15*,"
! 88: "2.0.16*,"
! 89: "2.0.17*,"
! 90: "2.0.18*,"
! 91: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 92: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 93: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 94: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 95: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
96: SSH_BUG_DUMMYCHAN },
1.55 ! markus 97: { "2.0.11*,"
! 98: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 99: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
100: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
101: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 102: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
103: SSH_BUG_DUMMYCHAN },
1.55 ! markus 104: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 105: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
106: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 107: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 108: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.53 markus 109: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN },
1.55 ! markus 110: { "2.2.0*,"
! 111: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.52 markus 112: SSH_BUG_RSASIGMD5 },
1.55 ! markus 113: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
! 114: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
! 115: { "2.*", SSH_BUG_DEBUG },
! 116: { "3.0.*", SSH_BUG_DEBUG },
! 117: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
! 118: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
! 119: { "1.2.18*,"
! 120: "1.2.19*,"
! 121: "1.2.20*,"
! 122: "1.2.21*,"
! 123: "1.2.22*", SSH_BUG_IGNOREMSG },
! 124: { "1.3.2*", SSH_BUG_IGNOREMSG }, /* f-secure */
! 125: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 126: SSH_BUG_PASSWORDPAD },
1.55 ! markus 127: { "*OSU_0*,"
! 128: "OSU_1.0*,"
! 129: "OSU_1.1*,"
! 130: "OSU_1.2*,"
! 131: "OSU_1.3*,"
! 132: "OSU_1.4*,"
! 133: "OSU_1.5alpha1*,"
! 134: "OSU_1.5alpha2*,"
! 135: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
! 136: { "*SSH_Version_Mapper*",
1.39 deraadt 137: SSH_BUG_SCANNER },
1.25 markus 138: { NULL, 0 }
1.6 markus 139: };
1.55 ! markus 140:
1.21 markus 141: /* process table, return first match */
1.24 markus 142: for (i = 0; check[i].pat; i++) {
1.55 ! markus 143: if (match_pattern_list(version, check[i].pat,
! 144: strlen(check[i].pat), 0) == 1) {
1.32 provos 145: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 146: datafellows = check[i].bugs;
1.6 markus 147: return;
148: }
149: }
1.24 markus 150: debug("no match: %s", version);
1.10 markus 151: }
152:
153: #define SEP ","
154: int
155: proto_spec(const char *spec)
156: {
1.18 provos 157: char *s, *p, *q;
1.10 markus 158: int ret = SSH_PROTO_UNKNOWN;
159:
1.14 markus 160: if (spec == NULL)
161: return ret;
1.18 provos 162: q = s = xstrdup(spec);
1.19 ho 163: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 164: switch (atoi(p)) {
1.10 markus 165: case 1:
166: if (ret == SSH_PROTO_UNKNOWN)
167: ret |= SSH_PROTO_1_PREFERRED;
168: ret |= SSH_PROTO_1;
169: break;
170: case 2:
171: ret |= SSH_PROTO_2;
172: break;
173: default:
174: log("ignoring bad proto spec: '%s'.", p);
175: break;
176: }
177: }
178: xfree(s);
179: return ret;
1.40 djm 180: }
181:
182: char *
183: compat_cipher_proposal(char *cipher_prop)
184: {
185: char *orig_prop, *fix_ciphers;
186: char *cp, *tmp;
187: size_t len;
188:
189: if (!(datafellows & SSH_BUG_BIGENDIANAES))
190: return(cipher_prop);
191:
192: len = strlen(cipher_prop) + 1;
193: fix_ciphers = xmalloc(len);
194: *fix_ciphers = '\0';
195: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 196: while ((cp = strsep(&tmp, ",")) != NULL) {
1.40 djm 197: if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
198: if (*fix_ciphers)
199: strlcat(fix_ciphers, ",", len);
200: strlcat(fix_ciphers, cp, len);
201: }
202: }
203: xfree(orig_prop);
204: debug2("Original cipher proposal: %s", cipher_prop);
205: debug2("Compat cipher proposal: %s", fix_ciphers);
206: if (!*fix_ciphers)
207: fatal("No available ciphers found.");
208:
209: return(fix_ciphers);
1.1 markus 210: }
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