1 /* 2 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. 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 /* 25 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #include "includes.h" 30 RCSID("$OpenBSD: compat.c,v 1.65 2002/09/27 10:42:09 mickey Exp $"); 31 32 #pragma ident "%Z%%M% %I% %E% SMI" 33 34 #include "buffer.h" 35 #include "packet.h" 36 #include "xmalloc.h" 37 #include "compat.h" 38 #include "log.h" 39 #include "match.h" 40 41 int compat13 = 0; 42 int compat20 = 0; 43 int datafellows = 0; 44 45 void 46 enable_compat20(void) 47 { 48 debug("Enabling compatibility mode for protocol 2.0"); 49 compat20 = 1; 50 } 51 void 52 enable_compat13(void) 53 { 54 debug("Enabling compatibility mode for protocol 1.3"); 55 compat13 = 1; 56 } 57 /* datafellows bug compatibility */ 58 void 59 compat_datafellows(const char *version) 60 { 61 int i; 62 static struct { 63 char *pat; 64 int bugs; 65 } check[] = { 66 { "OpenSSH-2.0*," 67 "OpenSSH-2.1*," 68 "OpenSSH_2.1*," 69 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| 70 SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 71 SSH_BUG_EXTEOF}, 72 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| 73 SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 74 SSH_BUG_EXTEOF}, 75 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 76 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, 77 { "OpenSSH_2.5.0p1*," 78 "OpenSSH_2.5.1p1*", 79 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 80 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 81 SSH_OLD_GSSAPI}, 82 { "OpenSSH_2.5.0*," 83 "OpenSSH_2.5.1*," 84 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 85 SSH_BUG_EXTEOF}, 86 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, 87 { "OpenSSH_2.9p*", SSH_BUG_EXTEOF|SSH_OLD_GSSAPI| 88 SSH_BUG_GSSKEX_HOSTKEY}, 89 { "OpenSSH_2.*," 90 "OpenSSH_3.0*," 91 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_GSSAPI| 92 SSH_BUG_GSSAPI_BER| 93 SSH_BUG_GSSKEX_HOSTKEY}, 94 { "OpenSSH_3.2*," 95 "OpenSSH_3.3*," 96 "OpenSSH_3.4*," 97 "OpenSSH_3.5*", SSH_BUG_GSSAPI_BER|SSH_OLD_GSSAPI| 98 SSH_BUG_GSSKEX_HOSTKEY}, 99 { "OpenSSH_3.6*," 100 "OpenSSH_3.7*," 101 "OpenSSH_3.8*", SSH_BUG_GSSKEX_HOSTKEY}, 102 { "OpenSSH*", 0 }, 103 { "Sun_SSH_1.0.*", SSH_BUG_NOREKEY| 104 SSH_BUG_DFLT_CLNT_EXIT_0| 105 SSH_BUG_LOCALES_NOT_LANGTAGS}, 106 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 107 SSH_BUG_DFLT_CLNT_EXIT_0| 108 SSH_BUG_LOCALES_NOT_LANGTAGS}, 109 { "*MindTerm*", 0 }, 110 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 111 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 112 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 113 SSH_BUG_FIRSTKEX }, 114 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 115 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 116 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 117 SSH_BUG_FIRSTKEX }, 118 { "2.0.13*," 119 "2.0.14*," 120 "2.0.15*," 121 "2.0.16*," 122 "2.0.17*," 123 "2.0.18*," 124 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 125 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 126 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 127 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| 128 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| 129 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 130 { "2.0.11*," 131 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 132 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 133 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 134 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 135 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 136 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 137 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 138 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 139 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 140 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 141 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 142 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| 143 SSH_BUG_FIRSTKEX }, 144 { "2.2.0*," 145 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| 146 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, 147 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| 148 SSH_BUG_FIRSTKEX }, 149 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ 150 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, 151 { "3.0.*", SSH_BUG_DEBUG }, 152 { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, 153 { "1.7 SecureFX*", SSH_OLD_SESSIONID }, 154 { "1.2.18*," 155 "1.2.19*," 156 "1.2.20*," 157 "1.2.21*," 158 "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 159 { "1.3.2*", /* F-Secure */ 160 SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 161 { "1.2.1*," 162 "1.2.2*," 163 "1.2.3*", SSH_BUG_K5USER }, 164 { "*SSH Compatible Server*", /* Netscreen */ 165 SSH_BUG_PASSWORDPAD }, 166 { "*OSU_0*," 167 "OSU_1.0*," 168 "OSU_1.1*," 169 "OSU_1.2*," 170 "OSU_1.3*," 171 "OSU_1.4*," 172 "OSU_1.5alpha1*," 173 "OSU_1.5alpha2*," 174 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, 175 { "*SSH_Version_Mapper*", 176 SSH_BUG_SCANNER }, 177 { "Probe-*", 178 SSH_BUG_PROBE }, 179 { NULL, 0 } 180 }; 181 182 /* process table, return first match */ 183 for (i = 0; check[i].pat; i++) { 184 if (match_pattern_list(version, check[i].pat, 185 strlen(check[i].pat), 0) == 1) { 186 debug("match: %s pat %s", version, check[i].pat); 187 datafellows = check[i].bugs; 188 return; 189 } 190 } 191 debug("no match: %s", version); 192 } 193 194 #define SEP "," 195 int 196 proto_spec(const char *spec) 197 { 198 char *s, *p, *q; 199 int ret = SSH_PROTO_UNKNOWN; 200 201 if (spec == NULL) 202 return ret; 203 q = s = xstrdup(spec); 204 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { 205 switch (atoi(p)) { 206 case 1: 207 if (ret == SSH_PROTO_UNKNOWN) 208 ret |= SSH_PROTO_1_PREFERRED; 209 ret |= SSH_PROTO_1; 210 break; 211 case 2: 212 ret |= SSH_PROTO_2; 213 break; 214 default: 215 log("ignoring bad proto spec: '%s'.", p); 216 break; 217 } 218 } 219 xfree(s); 220 return ret; 221 } 222 223 char * 224 compat_cipher_proposal(char *cipher_prop) 225 { 226 Buffer b; 227 char *orig_prop, *fix_ciphers; 228 char *cp, *tmp; 229 230 if (!(datafellows & SSH_BUG_BIGENDIANAES)) 231 return(cipher_prop); 232 233 buffer_init(&b); 234 tmp = orig_prop = xstrdup(cipher_prop); 235 while ((cp = strsep(&tmp, ",")) != NULL) { 236 if (strncmp(cp, "aes", 3) != 0) { 237 if (buffer_len(&b) > 0) 238 buffer_append(&b, ",", 1); 239 buffer_append(&b, cp, strlen(cp)); 240 } 241 } 242 buffer_append(&b, "\0", 1); 243 fix_ciphers = xstrdup(buffer_ptr(&b)); 244 buffer_free(&b); 245 xfree(orig_prop); 246 debug2("Original cipher proposal: %s", cipher_prop); 247 debug2("Compat cipher proposal: %s", fix_ciphers); 248 if (!*fix_ciphers) 249 fatal("No available ciphers found."); 250 251 return(fix_ciphers); 252 } 253