Annotation of src/usr.bin/ssh/compat.c, Revision 1.47.2.2
1.5 markus 1: /*
1.47.2.2! miod 2: * Copyright (c) 1999, 2000, 2001, 2002 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"
1.47.2.2! miod 26: RCSID("$OpenBSD: compat.c,v 1.61 2002/03/06 00:24:39 markus Exp $");
1.2 markus 27:
1.47.2.2! miod 28: #include "buffer.h"
1.6 markus 29: #include "packet.h"
1.10 markus 30: #include "xmalloc.h"
31: #include "compat.h"
1.34 markus 32: #include "log.h"
1.47.2.2! miod 33: #include "match.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: {
1.47.2.2! miod 55: int i;
1.24 markus 56: static struct {
57: char *pat;
1.13 markus 58: int bugs;
59: } check[] = {
1.47.2.2! miod 60: { "OpenSSH-2.0*,"
! 61: "OpenSSH-2.1*,"
! 62: "OpenSSH_2.1*,"
! 63: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.45 markus 64: SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
1.47.2.2! miod 65: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.45 markus 66: SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
1.47.2.2! miod 67: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.45 markus 68: SSH_BUG_NOREKEY},
1.47.2.2! miod 69: { "OpenSSH_2.5.0p1*,"
! 70: "OpenSSH_2.5.1p1*",
1.45 markus 71: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
72: SSH_BUG_NOREKEY },
1.47.2.2! miod 73: { "OpenSSH_2.5.0*,"
! 74: "OpenSSH_2.5.1*,"
! 75: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
! 76: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY },
! 77: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY },
! 78: { "OpenSSH*", 0 },
! 79: { "*MindTerm*", 0 },
! 80: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 81: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.46 markus 82: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.47.2.2! miod 83: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 84: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.46 markus 85: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.47.2.2! miod 86: { "2.0.13*,"
! 87: "2.0.14*,"
! 88: "2.0.15*,"
! 89: "2.0.16*,"
! 90: "2.0.17*,"
! 91: "2.0.18*,"
! 92: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 93: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 94: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 95: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.47.2.1 jason 96: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
97: SSH_BUG_DUMMYCHAN },
1.47.2.2! miod 98: { "2.0.11*,"
! 99: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.47.2.1 jason 100: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
101: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
102: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
103: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
104: SSH_BUG_DUMMYCHAN },
1.47.2.2! miod 105: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 106: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
107: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 108: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.47.2.1 jason 109: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
110: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN },
1.47.2.2! miod 111: { "2.2.0*,"
! 112: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.41 markus 113: SSH_BUG_RSASIGMD5 },
1.47.2.2! miod 114: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
! 115: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
! 116: { "2.*", SSH_BUG_DEBUG },
! 117: { "3.0.*", SSH_BUG_DEBUG },
! 118: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
! 119: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
! 120: { "1.2.18*,"
! 121: "1.2.19*,"
! 122: "1.2.20*,"
! 123: "1.2.21*,"
! 124: "1.2.22*", SSH_BUG_IGNOREMSG },
! 125: { "1.3.2*", SSH_BUG_IGNOREMSG }, /* f-secure */
! 126: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 127: SSH_BUG_PASSWORDPAD },
1.47.2.2! miod 128: { "*OSU_0*,"
! 129: "OSU_1.0*,"
! 130: "OSU_1.1*,"
! 131: "OSU_1.2*,"
! 132: "OSU_1.3*,"
! 133: "OSU_1.4*,"
! 134: "OSU_1.5alpha1*,"
! 135: "OSU_1.5alpha2*,"
! 136: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
! 137: { "*SSH_Version_Mapper*",
1.39 deraadt 138: SSH_BUG_SCANNER },
1.25 markus 139: { NULL, 0 }
1.6 markus 140: };
1.47.2.2! miod 141:
1.21 markus 142: /* process table, return first match */
1.24 markus 143: for (i = 0; check[i].pat; i++) {
1.47.2.2! miod 144: if (match_pattern_list(version, check[i].pat,
! 145: strlen(check[i].pat), 0) == 1) {
1.32 provos 146: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 147: datafellows = check[i].bugs;
1.6 markus 148: return;
149: }
150: }
1.24 markus 151: debug("no match: %s", version);
1.10 markus 152: }
153:
154: #define SEP ","
155: int
156: proto_spec(const char *spec)
157: {
1.18 provos 158: char *s, *p, *q;
1.10 markus 159: int ret = SSH_PROTO_UNKNOWN;
160:
1.14 markus 161: if (spec == NULL)
162: return ret;
1.18 provos 163: q = s = xstrdup(spec);
1.19 ho 164: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.47.2.2! miod 165: switch (atoi(p)) {
1.10 markus 166: case 1:
167: if (ret == SSH_PROTO_UNKNOWN)
168: ret |= SSH_PROTO_1_PREFERRED;
169: ret |= SSH_PROTO_1;
170: break;
171: case 2:
172: ret |= SSH_PROTO_2;
173: break;
174: default:
175: log("ignoring bad proto spec: '%s'.", p);
176: break;
177: }
178: }
179: xfree(s);
180: return ret;
1.40 djm 181: }
182:
183: char *
184: compat_cipher_proposal(char *cipher_prop)
185: {
1.47.2.2! miod 186: Buffer b;
1.40 djm 187: char *orig_prop, *fix_ciphers;
188: char *cp, *tmp;
189:
190: if (!(datafellows & SSH_BUG_BIGENDIANAES))
191: return(cipher_prop);
192:
1.47.2.2! miod 193: buffer_init(&b);
1.40 djm 194: tmp = orig_prop = xstrdup(cipher_prop);
1.47.2.2! miod 195: while ((cp = strsep(&tmp, ",")) != NULL) {
! 196: if (strncmp(cp, "aes", 3) != 0) {
! 197: if (buffer_len(&b) > 0)
! 198: buffer_append(&b, ",", 1);
! 199: buffer_append(&b, cp, strlen(cp));
1.40 djm 200: }
201: }
1.47.2.2! miod 202: buffer_append(&b, "\0", 1);
! 203: fix_ciphers = xstrdup(buffer_ptr(&b));
! 204: buffer_free(&b);
1.40 djm 205: xfree(orig_prop);
206: debug2("Original cipher proposal: %s", cipher_prop);
207: debug2("Compat cipher proposal: %s", fix_ciphers);
208: if (!*fix_ciphers)
209: fatal("No available ciphers found.");
210:
211: return(fix_ciphers);
1.1 markus 212: }
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