Annotation of src/usr.bin/ssh/compat.c, Revision 1.71
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"
1.71 ! djm 26: RCSID("$OpenBSD: compat.c,v 1.70 2003/11/02 11:01:03 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|
1.71 ! djm 65: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 66: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
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.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 ! djm 70: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
! 71: SSH_OLD_FORWARD_ADDR},
1.55 markus 72: { "OpenSSH_2.5.0p1*,"
73: "OpenSSH_2.5.1p1*",
1.45 markus 74: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 ! djm 75: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
! 76: SSH_OLD_FORWARD_ADDR},
1.55 markus 77: { "OpenSSH_2.5.0*,"
78: "OpenSSH_2.5.1*,"
1.62 markus 79: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 ! djm 80: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
! 81: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
! 82: SSH_OLD_FORWARD_ADDR},
1.62 markus 83: { "OpenSSH_2.*,"
84: "OpenSSH_3.0*,"
1.71 ! djm 85: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
! 86: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 87: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.55 markus 88: { "OpenSSH*", 0 },
89: { "*MindTerm*", 0 },
90: { "2.1.0*", 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 },
1.55 markus 94: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 95: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 96: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
97: SSH_BUG_FIRSTKEX },
1.56 deraadt 98: { "2.0.13*,"
99: "2.0.14*,"
100: "2.0.15*,"
101: "2.0.16*,"
102: "2.0.17*,"
103: "2.0.18*,"
1.55 markus 104: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 105: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 106: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 107: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 108: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 109: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 110: { "2.0.11*,"
1.55 markus 111: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 112: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
113: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
114: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 115: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 116: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 117: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 118: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
119: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 120: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 121: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 122: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
123: SSH_BUG_FIRSTKEX },
1.55 markus 124: { "2.2.0*,"
125: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 126: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
127: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
128: SSH_BUG_FIRSTKEX },
1.55 markus 129: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.66 markus 130: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
1.55 markus 131: { "3.0.*", SSH_BUG_DEBUG },
132: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
133: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
134: { "1.2.18*,"
135: "1.2.19*,"
136: "1.2.20*,"
137: "1.2.21*,"
1.69 markus 138: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 139: { "1.3.2*", /* F-Secure */
1.69 markus 140: SSH_BUG_IGNOREMSG },
1.55 markus 141: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 142: SSH_BUG_PASSWORDPAD },
1.56 deraadt 143: { "*OSU_0*,"
1.55 markus 144: "OSU_1.0*,"
145: "OSU_1.1*,"
146: "OSU_1.2*,"
147: "OSU_1.3*,"
148: "OSU_1.4*,"
149: "OSU_1.5alpha1*,"
150: "OSU_1.5alpha2*,"
151: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
152: { "*SSH_Version_Mapper*",
1.39 deraadt 153: SSH_BUG_SCANNER },
1.65 mickey 154: { "Probe-*",
155: SSH_BUG_PROBE },
1.25 markus 156: { NULL, 0 }
1.6 markus 157: };
1.55 markus 158:
1.21 markus 159: /* process table, return first match */
1.24 markus 160: for (i = 0; check[i].pat; i++) {
1.55 markus 161: if (match_pattern_list(version, check[i].pat,
162: strlen(check[i].pat), 0) == 1) {
1.32 provos 163: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 164: datafellows = check[i].bugs;
1.6 markus 165: return;
166: }
167: }
1.24 markus 168: debug("no match: %s", version);
1.10 markus 169: }
170:
171: #define SEP ","
172: int
173: proto_spec(const char *spec)
174: {
1.18 provos 175: char *s, *p, *q;
1.10 markus 176: int ret = SSH_PROTO_UNKNOWN;
177:
1.14 markus 178: if (spec == NULL)
179: return ret;
1.18 provos 180: q = s = xstrdup(spec);
1.19 ho 181: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 182: switch (atoi(p)) {
1.10 markus 183: case 1:
184: if (ret == SSH_PROTO_UNKNOWN)
185: ret |= SSH_PROTO_1_PREFERRED;
186: ret |= SSH_PROTO_1;
187: break;
188: case 2:
189: ret |= SSH_PROTO_2;
190: break;
191: default:
1.67 itojun 192: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 193: break;
194: }
195: }
196: xfree(s);
197: return ret;
1.40 djm 198: }
199:
200: char *
201: compat_cipher_proposal(char *cipher_prop)
202: {
1.57 markus 203: Buffer b;
1.40 djm 204: char *orig_prop, *fix_ciphers;
205: char *cp, *tmp;
206:
207: if (!(datafellows & SSH_BUG_BIGENDIANAES))
208: return(cipher_prop);
209:
1.57 markus 210: buffer_init(&b);
1.40 djm 211: tmp = orig_prop = xstrdup(cipher_prop);
1.54 deraadt 212: while ((cp = strsep(&tmp, ",")) != NULL) {
1.58 markus 213: if (strncmp(cp, "aes", 3) != 0) {
1.57 markus 214: if (buffer_len(&b) > 0)
215: buffer_append(&b, ",", 1);
216: buffer_append(&b, cp, strlen(cp));
1.40 djm 217: }
218: }
1.57 markus 219: buffer_append(&b, "\0", 1);
220: fix_ciphers = xstrdup(buffer_ptr(&b));
221: buffer_free(&b);
1.40 djm 222: xfree(orig_prop);
223: debug2("Original cipher proposal: %s", cipher_prop);
224: debug2("Compat cipher proposal: %s", fix_ciphers);
225: if (!*fix_ciphers)
226: fatal("No available ciphers found.");
227:
228: return(fix_ciphers);
1.1 markus 229: }