Annotation of src/usr.bin/ssh/compat.c, Revision 1.75
1.75 ! stevesk 1: /* $OpenBSD: compat.c,v 1.74 2006/07/22 20:48:23 stevesk Exp $ */
1.5 markus 2: /*
1.61 markus 3: * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
1.5 markus 4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25:
1.1 markus 26: #include "includes.h"
1.74 stevesk 27:
1.75 ! stevesk 28: #include <stdlib.h>
1.74 stevesk 29: #include <string.h>
1.2 markus 30:
1.57 markus 31: #include "buffer.h"
1.6 markus 32: #include "packet.h"
1.10 markus 33: #include "xmalloc.h"
34: #include "compat.h"
1.34 markus 35: #include "log.h"
1.55 markus 36: #include "match.h"
1.1 markus 37:
1.4 markus 38: int compat13 = 0;
1.6 markus 39: int compat20 = 0;
40: int datafellows = 0;
1.4 markus 41:
1.11 markus 42: void
1.6 markus 43: enable_compat20(void)
44: {
1.64 stevesk 45: debug("Enabling compatibility mode for protocol 2.0");
1.7 markus 46: compat20 = 1;
1.6 markus 47: }
1.11 markus 48: void
1.4 markus 49: enable_compat13(void)
50: {
1.64 stevesk 51: debug("Enabling compatibility mode for protocol 1.3");
1.4 markus 52: compat13 = 1;
1.6 markus 53: }
54: /* datafellows bug compatibility */
55: void
56: compat_datafellows(const char *version)
57: {
1.55 markus 58: int i;
1.24 markus 59: static struct {
60: char *pat;
1.13 markus 61: int bugs;
62: } check[] = {
1.55 markus 63: { "OpenSSH-2.0*,"
64: "OpenSSH-2.1*,"
65: "OpenSSH_2.1*,"
66: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.62 markus 67: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 68: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 69: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.62 markus 70: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 71: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 72: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 73: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
74: SSH_OLD_FORWARD_ADDR},
1.55 markus 75: { "OpenSSH_2.5.0p1*,"
76: "OpenSSH_2.5.1p1*",
1.45 markus 77: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 78: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
79: SSH_OLD_FORWARD_ADDR},
1.55 markus 80: { "OpenSSH_2.5.0*,"
81: "OpenSSH_2.5.1*,"
1.62 markus 82: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 83: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
84: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
85: SSH_OLD_FORWARD_ADDR},
1.62 markus 86: { "OpenSSH_2.*,"
87: "OpenSSH_3.0*,"
1.71 djm 88: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
89: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 90: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.55 markus 91: { "OpenSSH*", 0 },
92: { "*MindTerm*", 0 },
93: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 94: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 95: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
96: SSH_BUG_FIRSTKEX },
1.55 markus 97: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 98: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 99: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
100: SSH_BUG_FIRSTKEX },
1.56 deraadt 101: { "2.0.13*,"
102: "2.0.14*,"
103: "2.0.15*,"
104: "2.0.16*,"
105: "2.0.17*,"
106: "2.0.18*,"
1.55 markus 107: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 108: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 109: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 110: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 111: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 112: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 113: { "2.0.11*,"
1.55 markus 114: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 115: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
116: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
117: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 118: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 119: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 120: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 121: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
122: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 123: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 124: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 125: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
126: SSH_BUG_FIRSTKEX },
1.55 markus 127: { "2.2.0*,"
128: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 129: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
130: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
131: SSH_BUG_FIRSTKEX },
1.55 markus 132: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.66 markus 133: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
1.55 markus 134: { "3.0.*", SSH_BUG_DEBUG },
135: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
136: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
137: { "1.2.18*,"
138: "1.2.19*,"
139: "1.2.20*,"
140: "1.2.21*,"
1.69 markus 141: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 142: { "1.3.2*", /* F-Secure */
1.69 markus 143: SSH_BUG_IGNOREMSG },
1.55 markus 144: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 145: SSH_BUG_PASSWORDPAD },
1.56 deraadt 146: { "*OSU_0*,"
1.55 markus 147: "OSU_1.0*,"
148: "OSU_1.1*,"
149: "OSU_1.2*,"
150: "OSU_1.3*,"
151: "OSU_1.4*,"
152: "OSU_1.5alpha1*,"
153: "OSU_1.5alpha2*,"
154: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
155: { "*SSH_Version_Mapper*",
1.39 deraadt 156: SSH_BUG_SCANNER },
1.65 mickey 157: { "Probe-*",
158: SSH_BUG_PROBE },
1.25 markus 159: { NULL, 0 }
1.6 markus 160: };
1.55 markus 161:
1.21 markus 162: /* process table, return first match */
1.24 markus 163: for (i = 0; check[i].pat; i++) {
1.55 markus 164: if (match_pattern_list(version, check[i].pat,
165: strlen(check[i].pat), 0) == 1) {
1.32 provos 166: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 167: datafellows = check[i].bugs;
1.6 markus 168: return;
169: }
170: }
1.24 markus 171: debug("no match: %s", version);
1.10 markus 172: }
173:
174: #define SEP ","
175: int
176: proto_spec(const char *spec)
177: {
1.18 provos 178: char *s, *p, *q;
1.10 markus 179: int ret = SSH_PROTO_UNKNOWN;
180:
1.14 markus 181: if (spec == NULL)
182: return ret;
1.18 provos 183: q = s = xstrdup(spec);
1.19 ho 184: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 185: switch (atoi(p)) {
1.10 markus 186: case 1:
187: if (ret == SSH_PROTO_UNKNOWN)
188: ret |= SSH_PROTO_1_PREFERRED;
189: ret |= SSH_PROTO_1;
190: break;
191: case 2:
192: ret |= SSH_PROTO_2;
193: break;
194: default:
1.67 itojun 195: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 196: break;
197: }
198: }
199: xfree(s);
200: return ret;
1.40 djm 201: }
202:
203: char *
204: compat_cipher_proposal(char *cipher_prop)
205: {
1.57 markus 206: Buffer b;
1.40 djm 207: char *orig_prop, *fix_ciphers;
208: char *cp, *tmp;
209:
210: if (!(datafellows & SSH_BUG_BIGENDIANAES))
211: return(cipher_prop);
212:
1.57 markus 213: buffer_init(&b);
1.40 djm 214: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 215: while ((cp = strsep(&tmp, ",")) != NULL) {
1.58 markus 216: if (strncmp(cp, "aes", 3) != 0) {
1.57 markus 217: if (buffer_len(&b) > 0)
218: buffer_append(&b, ",", 1);
219: buffer_append(&b, cp, strlen(cp));
1.40 djm 220: }
221: }
1.57 markus 222: buffer_append(&b, "\0", 1);
223: fix_ciphers = xstrdup(buffer_ptr(&b));
224: buffer_free(&b);
1.40 djm 225: xfree(orig_prop);
226: debug2("Original cipher proposal: %s", cipher_prop);
227: debug2("Compat cipher proposal: %s", fix_ciphers);
228: if (!*fix_ciphers)
229: fatal("No available ciphers found.");
230:
231: return(fix_ciphers);
1.1 markus 232: }
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