Annotation of src/usr.bin/ssh/compat.c, Revision 1.72
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"
1.2 markus 26:
1.57 markus 27: #include "buffer.h"
1.6 markus 28: #include "packet.h"
1.10 markus 29: #include "xmalloc.h"
30: #include "compat.h"
1.34 markus 31: #include "log.h"
1.55 markus 32: #include "match.h"
1.1 markus 33:
1.4 markus 34: int compat13 = 0;
1.6 markus 35: int compat20 = 0;
36: int datafellows = 0;
1.4 markus 37:
1.11 markus 38: void
1.6 markus 39: enable_compat20(void)
40: {
1.64 stevesk 41: debug("Enabling compatibility mode for protocol 2.0");
1.7 markus 42: compat20 = 1;
1.6 markus 43: }
1.11 markus 44: void
1.4 markus 45: enable_compat13(void)
46: {
1.64 stevesk 47: debug("Enabling compatibility mode for protocol 1.3");
1.4 markus 48: compat13 = 1;
1.6 markus 49: }
50: /* datafellows bug compatibility */
51: void
52: compat_datafellows(const char *version)
53: {
1.55 markus 54: int i;
1.24 markus 55: static struct {
56: char *pat;
1.13 markus 57: int bugs;
58: } check[] = {
1.55 markus 59: { "OpenSSH-2.0*,"
60: "OpenSSH-2.1*,"
61: "OpenSSH_2.1*,"
62: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.62 markus 63: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 64: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 65: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.62 markus 66: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 67: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 68: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 69: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
70: SSH_OLD_FORWARD_ADDR},
1.55 markus 71: { "OpenSSH_2.5.0p1*,"
72: "OpenSSH_2.5.1p1*",
1.45 markus 73: 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_2.5.0*,"
77: "OpenSSH_2.5.1*,"
1.62 markus 78: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 79: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
80: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
81: SSH_OLD_FORWARD_ADDR},
1.62 markus 82: { "OpenSSH_2.*,"
83: "OpenSSH_3.0*,"
1.71 djm 84: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
85: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 86: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.55 markus 87: { "OpenSSH*", 0 },
88: { "*MindTerm*", 0 },
89: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 90: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 91: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
92: SSH_BUG_FIRSTKEX },
1.55 markus 93: { "2.1 *", 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 },
1.56 deraadt 97: { "2.0.13*,"
98: "2.0.14*,"
99: "2.0.15*,"
100: "2.0.16*,"
101: "2.0.17*,"
102: "2.0.18*,"
1.55 markus 103: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 104: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 105: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 106: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 107: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 108: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 109: { "2.0.11*,"
1.55 markus 110: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 111: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
112: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
113: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 114: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 115: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 116: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 117: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
118: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 119: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 120: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 121: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
122: SSH_BUG_FIRSTKEX },
1.55 markus 123: { "2.2.0*,"
124: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 125: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
126: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
127: SSH_BUG_FIRSTKEX },
1.55 markus 128: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.66 markus 129: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
1.55 markus 130: { "3.0.*", SSH_BUG_DEBUG },
131: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
132: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
133: { "1.2.18*,"
134: "1.2.19*,"
135: "1.2.20*,"
136: "1.2.21*,"
1.69 markus 137: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 138: { "1.3.2*", /* F-Secure */
1.69 markus 139: SSH_BUG_IGNOREMSG },
1.55 markus 140: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 141: SSH_BUG_PASSWORDPAD },
1.56 deraadt 142: { "*OSU_0*,"
1.55 markus 143: "OSU_1.0*,"
144: "OSU_1.1*,"
145: "OSU_1.2*,"
146: "OSU_1.3*,"
147: "OSU_1.4*,"
148: "OSU_1.5alpha1*,"
149: "OSU_1.5alpha2*,"
150: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
151: { "*SSH_Version_Mapper*",
1.39 deraadt 152: SSH_BUG_SCANNER },
1.65 mickey 153: { "Probe-*",
154: SSH_BUG_PROBE },
1.25 markus 155: { NULL, 0 }
1.6 markus 156: };
1.55 markus 157:
1.21 markus 158: /* process table, return first match */
1.24 markus 159: for (i = 0; check[i].pat; i++) {
1.55 markus 160: if (match_pattern_list(version, check[i].pat,
161: strlen(check[i].pat), 0) == 1) {
1.32 provos 162: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 163: datafellows = check[i].bugs;
1.6 markus 164: return;
165: }
166: }
1.24 markus 167: debug("no match: %s", version);
1.10 markus 168: }
169:
170: #define SEP ","
171: int
172: proto_spec(const char *spec)
173: {
1.18 provos 174: char *s, *p, *q;
1.10 markus 175: int ret = SSH_PROTO_UNKNOWN;
176:
1.14 markus 177: if (spec == NULL)
178: return ret;
1.18 provos 179: q = s = xstrdup(spec);
1.19 ho 180: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 181: switch (atoi(p)) {
1.10 markus 182: case 1:
183: if (ret == SSH_PROTO_UNKNOWN)
184: ret |= SSH_PROTO_1_PREFERRED;
185: ret |= SSH_PROTO_1;
186: break;
187: case 2:
188: ret |= SSH_PROTO_2;
189: break;
190: default:
1.67 itojun 191: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 192: break;
193: }
194: }
195: xfree(s);
196: return ret;
1.40 djm 197: }
198:
199: char *
200: compat_cipher_proposal(char *cipher_prop)
201: {
1.57 markus 202: Buffer b;
1.40 djm 203: char *orig_prop, *fix_ciphers;
204: char *cp, *tmp;
205:
206: if (!(datafellows & SSH_BUG_BIGENDIANAES))
207: return(cipher_prop);
208:
1.57 markus 209: buffer_init(&b);
1.40 djm 210: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 211: while ((cp = strsep(&tmp, ",")) != NULL) {
1.58 markus 212: if (strncmp(cp, "aes", 3) != 0) {
1.57 markus 213: if (buffer_len(&b) > 0)
214: buffer_append(&b, ",", 1);
215: buffer_append(&b, cp, strlen(cp));
1.40 djm 216: }
217: }
1.57 markus 218: buffer_append(&b, "\0", 1);
219: fix_ciphers = xstrdup(buffer_ptr(&b));
220: buffer_free(&b);
1.40 djm 221: xfree(orig_prop);
222: debug2("Original cipher proposal: %s", cipher_prop);
223: debug2("Compat cipher proposal: %s", fix_ciphers);
224: if (!*fix_ciphers)
225: fatal("No available ciphers found.");
226:
227: return(fix_ciphers);
1.1 markus 228: }
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