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 2007 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_LOCALES_NOT_LANGTAGS}, 105 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 106 SSH_BUG_LOCALES_NOT_LANGTAGS}, 107 { "*MindTerm*", 0 }, 108 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 109 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 110 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 111 SSH_BUG_FIRSTKEX }, 112 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 113 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 114 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 115 SSH_BUG_FIRSTKEX }, 116 { "2.0.13*," 117 "2.0.14*," 118 "2.0.15*," 119 "2.0.16*," 120 "2.0.17*," 121 "2.0.18*," 122 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 123 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 124 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 125 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| 126 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| 127 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 128 { "2.0.11*," 129 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 130 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 131 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 132 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 133 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 134 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 135 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 136 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 137 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 138 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 139 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 140 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| 141 SSH_BUG_FIRSTKEX }, 142 { "2.2.0*," 143 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| 144 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, 145 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| 146 SSH_BUG_FIRSTKEX }, 147 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ 148 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX }, 149 { "3.0.*", SSH_BUG_DEBUG }, 150 { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, 151 { "1.7 SecureFX*", SSH_OLD_SESSIONID }, 152 { "1.2.18*," 153 "1.2.19*," 154 "1.2.20*," 155 "1.2.21*," 156 "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 157 { "1.3.2*", /* F-Secure */ 158 SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 159 { "1.2.1*," 160 "1.2.2*," 161 "1.2.3*", SSH_BUG_K5USER }, 162 { "*SSH Compatible Server*", /* Netscreen */ 163 SSH_BUG_PASSWORDPAD }, 164 { "*OSU_0*," 165 "OSU_1.0*," 166 "OSU_1.1*," 167 "OSU_1.2*," 168 "OSU_1.3*," 169 "OSU_1.4*," 170 "OSU_1.5alpha1*," 171 "OSU_1.5alpha2*," 172 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, 173 { "*SSH_Version_Mapper*", 174 SSH_BUG_SCANNER }, 175 { "Probe-*", 176 SSH_BUG_PROBE }, 177 { NULL, 0 } 178 }; 179 180 /* process table, return first match */ 181 for (i = 0; check[i].pat; i++) { 182 if (match_pattern_list(version, check[i].pat, 183 strlen(check[i].pat), 0) == 1) { 184 debug("match: %s pat %s", version, check[i].pat); 185 datafellows = check[i].bugs; 186 return; 187 } 188 } 189 debug("no match: %s", version); 190 } 191 192 #define SEP "," 193 int 194 proto_spec(const char *spec) 195 { 196 char *s, *p, *q; 197 int ret = SSH_PROTO_UNKNOWN; 198 199 if (spec == NULL) 200 return ret; 201 q = s = xstrdup(spec); 202 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { 203 switch (atoi(p)) { 204 case 1: 205 if (ret == SSH_PROTO_UNKNOWN) 206 ret |= SSH_PROTO_1_PREFERRED; 207 ret |= SSH_PROTO_1; 208 break; 209 case 2: 210 ret |= SSH_PROTO_2; 211 break; 212 default: 213 log("ignoring bad proto spec: '%s'.", p); 214 break; 215 } 216 } 217 xfree(s); 218 return ret; 219 } 220 221 char * 222 compat_cipher_proposal(char *cipher_prop) 223 { 224 Buffer b; 225 char *orig_prop, *fix_ciphers; 226 char *cp, *tmp; 227 228 if (!(datafellows & SSH_BUG_BIGENDIANAES)) 229 return(cipher_prop); 230 231 buffer_init(&b); 232 tmp = orig_prop = xstrdup(cipher_prop); 233 while ((cp = strsep(&tmp, ",")) != NULL) { 234 if (strncmp(cp, "aes", 3) != 0) { 235 if (buffer_len(&b) > 0) 236 buffer_append(&b, ",", 1); 237 buffer_append(&b, cp, strlen(cp)); 238 } 239 } 240 buffer_append(&b, "\0", 1); 241 fix_ciphers = xstrdup(buffer_ptr(&b)); 242 buffer_free(&b); 243 xfree(orig_prop); 244 debug2("Original cipher proposal: %s", cipher_prop); 245 debug2("Compat cipher proposal: %s", fix_ciphers); 246 if (!*fix_ciphers) 247 fatal("No available ciphers found."); 248 249 return(fix_ciphers); 250 } 251