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 2008 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 #include "buffer.h" 33 #include "packet.h" 34 #include "xmalloc.h" 35 #include "compat.h" 36 #include "log.h" 37 #include "match.h" 38 39 int compat13 = 0; 40 int compat20 = 0; 41 int datafellows = 0; 42 43 void 44 enable_compat20(void) 45 { 46 debug("Enabling compatibility mode for protocol 2.0"); 47 compat20 = 1; 48 } 49 void 50 enable_compat13(void) 51 { 52 debug("Enabling compatibility mode for protocol 1.3"); 53 compat13 = 1; 54 } 55 /* datafellows bug compatibility */ 56 void 57 compat_datafellows(const char *version) 58 { 59 int i; 60 static struct { 61 char *pat; 62 int bugs; 63 } check[] = { 64 { "OpenSSH-2.0*," 65 "OpenSSH-2.1*," 66 "OpenSSH_2.1*," 67 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| 68 SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 69 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 70 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| 71 SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 72 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 73 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 74 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 75 SSH_OLD_FORWARD_ADDR}, 76 { "OpenSSH_2.5.0p1*," 77 "OpenSSH_2.5.1p1*", 78 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 79 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 80 SSH_OLD_GSSAPI|SSH_OLD_FORWARD_ADDR}, 81 { "OpenSSH_2.5.0*," 82 "OpenSSH_2.5.1*," 83 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 84 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 85 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 86 SSH_OLD_FORWARD_ADDR}, 87 { "OpenSSH_2.9p*", SSH_BUG_EXTEOF|SSH_OLD_GSSAPI| 88 SSH_BUG_GSSKEX_HOSTKEY|SSH_OLD_FORWARD_ADDR}, 89 { "OpenSSH_2.*," 90 "OpenSSH_3.0*," 91 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR| 92 SSH_OLD_GSSAPI|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|SSH_OLD_FORWARD_ADDR}, 99 { "OpenSSH_3.6*," 100 "OpenSSH_3.7*," 101 "OpenSSH_3.8*", SSH_BUG_GSSKEX_HOSTKEY|SSH_OLD_FORWARD_ADDR}, 102 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR}, 103 { "OpenSSH*", 0 }, 104 { "Sun_SSH_1.0.*", SSH_BUG_NOREKEY| 105 SSH_BUG_LOCALES_NOT_LANGTAGS|SSH_OLD_FORWARD_ADDR}, 106 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 107 SSH_BUG_LOCALES_NOT_LANGTAGS|SSH_OLD_FORWARD_ADDR}, 108 { "Sun_SSH_1.1*", SSH_OLD_FORWARD_ADDR}, 109 { "Sun_SSH_1.2*", 0 }, 110 { "Sun_SSH_1.3*", 0 }, 111 { "Sun_SSH_*", 0 }, 112 { "*MindTerm*", 0 }, 113 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 114 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 115 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 116 SSH_BUG_FIRSTKEX }, 117 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 118 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 119 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 120 SSH_BUG_FIRSTKEX }, 121 { "2.0.13*," 122 "2.0.14*," 123 "2.0.15*," 124 "2.0.16*," 125 "2.0.17*," 126 "2.0.18*," 127 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 128 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 129 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 130 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| 131 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| 132 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 133 { "2.0.11*," 134 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 135 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 136 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 137 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 138 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 139 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 140 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 141 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 142 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 143 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 144 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 145 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| 146 SSH_BUG_FIRSTKEX }, 147 { "2.2.0*," 148 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| 149 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, 150 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| 151 SSH_BUG_FIRSTKEX }, 152 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ 153 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX| 154 SSH_BUG_RFWD_ADDR}, 155 { "3.0.*", SSH_BUG_DEBUG }, 156 { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, 157 { "1.7 SecureFX*", SSH_OLD_SESSIONID }, 158 { "1.2.18*," 159 "1.2.19*," 160 "1.2.20*," 161 "1.2.21*," 162 "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 163 { "1.3.2*", /* F-Secure */ 164 SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 165 { "1.2.1*," 166 "1.2.2*," 167 "1.2.3*", SSH_BUG_K5USER }, 168 { "*SSH Compatible Server*", /* Netscreen */ 169 SSH_BUG_PASSWORDPAD }, 170 { "*OSU_0*," 171 "OSU_1.0*," 172 "OSU_1.1*," 173 "OSU_1.2*," 174 "OSU_1.3*," 175 "OSU_1.4*," 176 "OSU_1.5alpha1*," 177 "OSU_1.5alpha2*," 178 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, 179 { "*SSH_Version_Mapper*", 180 SSH_BUG_SCANNER }, 181 { "Probe-*", 182 SSH_BUG_PROBE }, 183 { NULL, 0 } 184 }; 185 186 /* process table, return first match */ 187 for (i = 0; check[i].pat; i++) { 188 if (match_pattern_list(version, check[i].pat, 189 strlen(check[i].pat), 0) == 1) { 190 debug("match: %s pat %s", version, check[i].pat); 191 datafellows = check[i].bugs; 192 return; 193 } 194 } 195 debug("no match: %s", version); 196 } 197 198 #define SEP "," 199 int 200 proto_spec(const char *spec) 201 { 202 char *s, *p, *q; 203 int ret = SSH_PROTO_UNKNOWN; 204 205 if (spec == NULL) 206 return ret; 207 q = s = xstrdup(spec); 208 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { 209 switch (atoi(p)) { 210 case 1: 211 if (ret == SSH_PROTO_UNKNOWN) 212 ret |= SSH_PROTO_1_PREFERRED; 213 ret |= SSH_PROTO_1; 214 break; 215 case 2: 216 ret |= SSH_PROTO_2; 217 break; 218 default: 219 log("ignoring bad proto spec: '%s'.", p); 220 break; 221 } 222 } 223 xfree(s); 224 return ret; 225 } 226 227 char * 228 compat_cipher_proposal(char *cipher_prop) 229 { 230 Buffer b; 231 char *orig_prop, *fix_ciphers; 232 char *cp, *tmp; 233 234 if (!(datafellows & SSH_BUG_BIGENDIANAES)) 235 return(cipher_prop); 236 237 buffer_init(&b); 238 tmp = orig_prop = xstrdup(cipher_prop); 239 while ((cp = strsep(&tmp, ",")) != NULL) { 240 if (strncmp(cp, "aes", 3) != 0) { 241 if (buffer_len(&b) > 0) 242 buffer_append(&b, ",", 1); 243 buffer_append(&b, cp, strlen(cp)); 244 } 245 } 246 buffer_append(&b, "\0", 1); 247 fix_ciphers = xstrdup(buffer_ptr(&b)); 248 buffer_free(&b); 249 xfree(orig_prop); 250 debug2("Original cipher proposal: %s", cipher_prop); 251 debug2("Compat cipher proposal: %s", fix_ciphers); 252 if (!*fix_ciphers) 253 fatal("No available ciphers found."); 254 255 return(fix_ciphers); 256 } 257