Annotation of src/usr.bin/ssh/compat.c, Revision 1.79
1.79 ! markus 1: /* $OpenBSD: compat.c,v 1.78 2008/09/11 14:22:37 markus 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:
1.76 deraadt 26: #include <sys/types.h>
1.74 stevesk 27:
1.75 stevesk 28: #include <stdlib.h>
1.74 stevesk 29: #include <string.h>
1.76 deraadt 30: #include <stdarg.h>
1.2 markus 31:
1.76 deraadt 32: #include "xmalloc.h"
1.57 markus 33: #include "buffer.h"
1.6 markus 34: #include "packet.h"
1.10 markus 35: #include "compat.h"
1.34 markus 36: #include "log.h"
1.55 markus 37: #include "match.h"
1.1 markus 38:
1.4 markus 39: int compat13 = 0;
1.6 markus 40: int compat20 = 0;
41: int datafellows = 0;
1.4 markus 42:
1.11 markus 43: void
1.6 markus 44: enable_compat20(void)
45: {
1.64 stevesk 46: debug("Enabling compatibility mode for protocol 2.0");
1.7 markus 47: compat20 = 1;
1.6 markus 48: }
1.11 markus 49: void
1.4 markus 50: enable_compat13(void)
51: {
1.64 stevesk 52: debug("Enabling compatibility mode for protocol 1.3");
1.4 markus 53: compat13 = 1;
1.6 markus 54: }
55: /* datafellows bug compatibility */
56: void
57: compat_datafellows(const char *version)
58: {
1.55 markus 59: int i;
1.24 markus 60: static struct {
61: char *pat;
1.13 markus 62: int bugs;
63: } check[] = {
1.55 markus 64: { "OpenSSH-2.0*,"
65: "OpenSSH-2.1*,"
66: "OpenSSH_2.1*,"
67: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.62 markus 68: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 69: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 70: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.62 markus 71: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 72: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 73: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 74: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
75: SSH_OLD_FORWARD_ADDR},
1.55 markus 76: { "OpenSSH_2.5.0p1*,"
77: "OpenSSH_2.5.1p1*",
1.45 markus 78: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 79: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
80: SSH_OLD_FORWARD_ADDR},
1.55 markus 81: { "OpenSSH_2.5.0*,"
82: "OpenSSH_2.5.1*,"
1.62 markus 83: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 84: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
85: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
86: SSH_OLD_FORWARD_ADDR},
1.62 markus 87: { "OpenSSH_2.*,"
88: "OpenSSH_3.0*,"
1.71 djm 89: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
90: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 91: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.78 markus 92: { "OpenSSH_4*", 0 },
1.79 ! markus 93: { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
1.78 markus 94: { "OpenSSH*", SSH_NEW_OPENSSH },
1.55 markus 95: { "*MindTerm*", 0 },
96: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 97: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 98: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
99: SSH_BUG_FIRSTKEX },
1.55 markus 100: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 101: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 102: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
103: SSH_BUG_FIRSTKEX },
1.56 deraadt 104: { "2.0.13*,"
105: "2.0.14*,"
106: "2.0.15*,"
107: "2.0.16*,"
108: "2.0.17*,"
109: "2.0.18*,"
1.55 markus 110: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 111: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 112: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 113: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 114: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 115: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 116: { "2.0.11*,"
1.55 markus 117: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 118: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
119: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
120: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 121: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 122: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 123: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 124: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
125: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 126: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 127: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 128: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
129: SSH_BUG_FIRSTKEX },
1.55 markus 130: { "2.2.0*,"
131: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 132: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
133: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
134: SSH_BUG_FIRSTKEX },
1.55 markus 135: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.77 djm 136: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
137: SSH_BUG_RFWD_ADDR },
1.55 markus 138: { "3.0.*", SSH_BUG_DEBUG },
139: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
140: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
141: { "1.2.18*,"
142: "1.2.19*,"
143: "1.2.20*,"
144: "1.2.21*,"
1.69 markus 145: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 146: { "1.3.2*", /* F-Secure */
1.69 markus 147: SSH_BUG_IGNOREMSG },
1.55 markus 148: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 149: SSH_BUG_PASSWORDPAD },
1.56 deraadt 150: { "*OSU_0*,"
1.55 markus 151: "OSU_1.0*,"
152: "OSU_1.1*,"
153: "OSU_1.2*,"
154: "OSU_1.3*,"
155: "OSU_1.4*,"
156: "OSU_1.5alpha1*,"
157: "OSU_1.5alpha2*,"
158: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
159: { "*SSH_Version_Mapper*",
1.39 deraadt 160: SSH_BUG_SCANNER },
1.65 mickey 161: { "Probe-*",
162: SSH_BUG_PROBE },
1.25 markus 163: { NULL, 0 }
1.6 markus 164: };
1.55 markus 165:
1.21 markus 166: /* process table, return first match */
1.24 markus 167: for (i = 0; check[i].pat; i++) {
1.55 markus 168: if (match_pattern_list(version, check[i].pat,
169: strlen(check[i].pat), 0) == 1) {
1.32 provos 170: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 171: datafellows = check[i].bugs;
1.6 markus 172: return;
173: }
174: }
1.24 markus 175: debug("no match: %s", version);
1.10 markus 176: }
177:
178: #define SEP ","
179: int
180: proto_spec(const char *spec)
181: {
1.18 provos 182: char *s, *p, *q;
1.10 markus 183: int ret = SSH_PROTO_UNKNOWN;
184:
1.14 markus 185: if (spec == NULL)
186: return ret;
1.18 provos 187: q = s = xstrdup(spec);
1.19 ho 188: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 189: switch (atoi(p)) {
1.10 markus 190: case 1:
191: if (ret == SSH_PROTO_UNKNOWN)
192: ret |= SSH_PROTO_1_PREFERRED;
193: ret |= SSH_PROTO_1;
194: break;
195: case 2:
196: ret |= SSH_PROTO_2;
197: break;
198: default:
1.67 itojun 199: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 200: break;
201: }
202: }
203: xfree(s);
204: return ret;
1.40 djm 205: }
206:
207: char *
208: compat_cipher_proposal(char *cipher_prop)
209: {
1.57 markus 210: Buffer b;
1.40 djm 211: char *orig_prop, *fix_ciphers;
212: char *cp, *tmp;
213:
214: if (!(datafellows & SSH_BUG_BIGENDIANAES))
215: return(cipher_prop);
216:
1.57 markus 217: buffer_init(&b);
1.40 djm 218: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 219: while ((cp = strsep(&tmp, ",")) != NULL) {
1.58 markus 220: if (strncmp(cp, "aes", 3) != 0) {
1.57 markus 221: if (buffer_len(&b) > 0)
222: buffer_append(&b, ",", 1);
223: buffer_append(&b, cp, strlen(cp));
1.40 djm 224: }
225: }
1.57 markus 226: buffer_append(&b, "\0", 1);
227: fix_ciphers = xstrdup(buffer_ptr(&b));
228: buffer_free(&b);
1.40 djm 229: xfree(orig_prop);
230: debug2("Original cipher proposal: %s", cipher_prop);
231: debug2("Compat cipher proposal: %s", fix_ciphers);
232: if (!*fix_ciphers)
233: fatal("No available ciphers found.");
234:
235: return(fix_ciphers);
1.1 markus 236: }
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