Annotation of src/usr.bin/ssh/compat.c, Revision 1.63.2.1
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"
1.63.2.1! miod 26: RCSID("$OpenBSD: compat.c,v 1.65 2002/09/27 10:42:09 mickey 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: {
1.63.2.1! miod 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: {
1.63.2.1! miod 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*,"
82: "OpenSSH_3.1*", SSH_BUG_EXTEOF},
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|
1.46 markus 88: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.55 markus 89: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 90: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.46 markus 91: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.56 deraadt 92: { "2.0.13*,"
93: "2.0.14*,"
94: "2.0.15*,"
95: "2.0.16*,"
96: "2.0.17*,"
97: "2.0.18*,"
1.55 markus 98: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 99: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 100: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 101: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 102: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
103: SSH_BUG_DUMMYCHAN },
1.56 deraadt 104: { "2.0.11*,"
1.55 markus 105: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 106: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
107: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
108: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 109: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
110: SSH_BUG_DUMMYCHAN },
1.55 markus 111: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 112: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
113: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 114: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 115: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.53 markus 116: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN },
1.55 markus 117: { "2.2.0*,"
118: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.52 markus 119: SSH_BUG_RSASIGMD5 },
1.55 markus 120: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
121: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
122: { "2.*", SSH_BUG_DEBUG },
123: { "3.0.*", SSH_BUG_DEBUG },
124: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
125: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
126: { "1.2.18*,"
127: "1.2.19*,"
128: "1.2.20*,"
129: "1.2.21*,"
1.63 markus 130: "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
131: { "1.3.2*", /* F-Secure */
132: SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
133: { "1.2.1*,"
134: "1.2.2*,"
135: "1.2.3*", SSH_BUG_K5USER },
1.55 markus 136: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 137: SSH_BUG_PASSWORDPAD },
1.56 deraadt 138: { "*OSU_0*,"
1.55 markus 139: "OSU_1.0*,"
140: "OSU_1.1*,"
141: "OSU_1.2*,"
142: "OSU_1.3*,"
143: "OSU_1.4*,"
144: "OSU_1.5alpha1*,"
145: "OSU_1.5alpha2*,"
146: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
147: { "*SSH_Version_Mapper*",
1.39 deraadt 148: SSH_BUG_SCANNER },
1.63.2.1! miod 149: { "Probe-*",
! 150: SSH_BUG_PROBE },
1.25 markus 151: { NULL, 0 }
1.6 markus 152: };
1.55 markus 153:
1.21 markus 154: /* process table, return first match */
1.24 markus 155: for (i = 0; check[i].pat; i++) {
1.55 markus 156: if (match_pattern_list(version, check[i].pat,
157: strlen(check[i].pat), 0) == 1) {
1.32 provos 158: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 159: datafellows = check[i].bugs;
1.6 markus 160: return;
161: }
162: }
1.24 markus 163: debug("no match: %s", version);
1.10 markus 164: }
165:
166: #define SEP ","
167: int
168: proto_spec(const char *spec)
169: {
1.18 provos 170: char *s, *p, *q;
1.10 markus 171: int ret = SSH_PROTO_UNKNOWN;
172:
1.14 markus 173: if (spec == NULL)
174: return ret;
1.18 provos 175: q = s = xstrdup(spec);
1.19 ho 176: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 177: switch (atoi(p)) {
1.10 markus 178: case 1:
179: if (ret == SSH_PROTO_UNKNOWN)
180: ret |= SSH_PROTO_1_PREFERRED;
181: ret |= SSH_PROTO_1;
182: break;
183: case 2:
184: ret |= SSH_PROTO_2;
185: break;
186: default:
187: log("ignoring bad proto spec: '%s'.", p);
188: break;
189: }
190: }
191: xfree(s);
192: return ret;
1.40 djm 193: }
194:
195: char *
196: compat_cipher_proposal(char *cipher_prop)
197: {
1.57 markus 198: Buffer b;
1.40 djm 199: char *orig_prop, *fix_ciphers;
200: char *cp, *tmp;
201:
202: if (!(datafellows & SSH_BUG_BIGENDIANAES))
203: return(cipher_prop);
204:
1.57 markus 205: buffer_init(&b);
1.40 djm 206: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 207: while ((cp = strsep(&tmp, ",")) != NULL) {
1.58 markus 208: if (strncmp(cp, "aes", 3) != 0) {
1.57 markus 209: if (buffer_len(&b) > 0)
210: buffer_append(&b, ",", 1);
211: buffer_append(&b, cp, strlen(cp));
1.40 djm 212: }
213: }
1.57 markus 214: buffer_append(&b, "\0", 1);
215: fix_ciphers = xstrdup(buffer_ptr(&b));
216: buffer_free(&b);
1.40 djm 217: xfree(orig_prop);
218: debug2("Original cipher proposal: %s", cipher_prop);
219: debug2("Compat cipher proposal: %s", fix_ciphers);
220: if (!*fix_ciphers)
221: fatal("No available ciphers found.");
222:
223: return(fix_ciphers);
1.1 markus 224: }
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