Annotation of src/usr.bin/ssh/compat.c, Revision 1.70
1.5 markus 1: /*
1.61 markus 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"
1.70 ! markus 26: RCSID("$OpenBSD: compat.c,v 1.69 2003/08/29 10:03:15 markus Exp $");
1.2 markus 27:
1.57 markus 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"
1.55 markus 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: {
1.64 stevesk 42: debug("Enabling compatibility mode for protocol 2.0");
1.7 markus 43: compat20 = 1;
1.6 markus 44: }
1.11 markus 45: void
1.4 markus 46: enable_compat13(void)
47: {
1.64 stevesk 48: debug("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: {
1.55 markus 55: int i;
1.24 markus 56: static struct {
57: char *pat;
1.13 markus 58: int bugs;
59: } check[] = {
1.55 markus 60: { "OpenSSH-2.0*,"
61: "OpenSSH-2.1*,"
62: "OpenSSH_2.1*,"
63: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.62 markus 64: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
65: SSH_BUG_EXTEOF},
1.55 markus 66: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.62 markus 67: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
68: SSH_BUG_EXTEOF},
1.55 markus 69: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.62 markus 70: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.55 markus 71: { "OpenSSH_2.5.0p1*,"
72: "OpenSSH_2.5.1p1*",
1.45 markus 73: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.62 markus 74: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.55 markus 75: { "OpenSSH_2.5.0*,"
76: "OpenSSH_2.5.1*,"
1.62 markus 77: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
78: SSH_BUG_EXTEOF},
79: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
80: { "OpenSSH_2.*,"
81: "OpenSSH_3.0*,"
1.70 ! markus 82: "OpenSSH_3.1*", SSH_BUG_EXTEOF},
1.62 markus 83: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.55 markus 84: { "OpenSSH*", 0 },
85: { "*MindTerm*", 0 },
86: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 87: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 88: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
89: SSH_BUG_FIRSTKEX },
1.55 markus 90: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 91: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 92: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
93: SSH_BUG_FIRSTKEX },
1.56 deraadt 94: { "2.0.13*,"
95: "2.0.14*,"
96: "2.0.15*,"
97: "2.0.16*,"
98: "2.0.17*,"
99: "2.0.18*,"
1.55 markus 100: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 101: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 102: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 103: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 104: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 105: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 106: { "2.0.11*,"
1.55 markus 107: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 108: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
109: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
110: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 111: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 112: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 113: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 114: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
115: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 116: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 117: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 118: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
119: SSH_BUG_FIRSTKEX },
1.55 markus 120: { "2.2.0*,"
121: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 122: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
123: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
124: SSH_BUG_FIRSTKEX },
1.55 markus 125: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.66 markus 126: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
1.55 markus 127: { "3.0.*", SSH_BUG_DEBUG },
128: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
129: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
130: { "1.2.18*,"
131: "1.2.19*,"
132: "1.2.20*,"
133: "1.2.21*,"
1.69 markus 134: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 135: { "1.3.2*", /* F-Secure */
1.69 markus 136: SSH_BUG_IGNOREMSG },
1.55 markus 137: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 138: SSH_BUG_PASSWORDPAD },
1.56 deraadt 139: { "*OSU_0*,"
1.55 markus 140: "OSU_1.0*,"
141: "OSU_1.1*,"
142: "OSU_1.2*,"
143: "OSU_1.3*,"
144: "OSU_1.4*,"
145: "OSU_1.5alpha1*,"
146: "OSU_1.5alpha2*,"
147: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
148: { "*SSH_Version_Mapper*",
1.39 deraadt 149: SSH_BUG_SCANNER },
1.65 mickey 150: { "Probe-*",
151: SSH_BUG_PROBE },
1.25 markus 152: { NULL, 0 }
1.6 markus 153: };
1.55 markus 154:
1.21 markus 155: /* process table, return first match */
1.24 markus 156: for (i = 0; check[i].pat; i++) {
1.55 markus 157: if (match_pattern_list(version, check[i].pat,
158: strlen(check[i].pat), 0) == 1) {
1.32 provos 159: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 160: datafellows = check[i].bugs;
1.6 markus 161: return;
162: }
163: }
1.24 markus 164: debug("no match: %s", version);
1.10 markus 165: }
166:
167: #define SEP ","
168: int
169: proto_spec(const char *spec)
170: {
1.18 provos 171: char *s, *p, *q;
1.10 markus 172: int ret = SSH_PROTO_UNKNOWN;
173:
1.14 markus 174: if (spec == NULL)
175: return ret;
1.18 provos 176: q = s = xstrdup(spec);
1.19 ho 177: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 178: switch (atoi(p)) {
1.10 markus 179: case 1:
180: if (ret == SSH_PROTO_UNKNOWN)
181: ret |= SSH_PROTO_1_PREFERRED;
182: ret |= SSH_PROTO_1;
183: break;
184: case 2:
185: ret |= SSH_PROTO_2;
186: break;
187: default:
1.67 itojun 188: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 189: break;
190: }
191: }
192: xfree(s);
193: return ret;
1.40 djm 194: }
195:
196: char *
197: compat_cipher_proposal(char *cipher_prop)
198: {
1.57 markus 199: Buffer b;
1.40 djm 200: char *orig_prop, *fix_ciphers;
201: char *cp, *tmp;
202:
203: if (!(datafellows & SSH_BUG_BIGENDIANAES))
204: return(cipher_prop);
205:
1.57 markus 206: buffer_init(&b);
1.40 djm 207: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 208: while ((cp = strsep(&tmp, ",")) != NULL) {
1.58 markus 209: if (strncmp(cp, "aes", 3) != 0) {
1.57 markus 210: if (buffer_len(&b) > 0)
211: buffer_append(&b, ",", 1);
212: buffer_append(&b, cp, strlen(cp));
1.40 djm 213: }
214: }
1.57 markus 215: buffer_append(&b, "\0", 1);
216: fix_ciphers = xstrdup(buffer_ptr(&b));
217: buffer_free(&b);
1.40 djm 218: xfree(orig_prop);
219: debug2("Original cipher proposal: %s", cipher_prop);
220: debug2("Compat cipher proposal: %s", fix_ciphers);
221: if (!*fix_ciphers)
222: fatal("No available ciphers found.");
223:
224: return(fix_ciphers);
1.1 markus 225: }