1 /* $NetBSD: compat.c,v 1.2 2009/06/07 22:38:46 christos Exp $ */ 2 /* $OpenBSD: compat.c,v 1.78 2008/09/11 14:22:37 markus Exp $ */ 3 /* 4 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 __RCSID("$NetBSD: compat.c,v 1.2 2009/06/07 22:38:46 christos Exp $"); 29 #include <sys/types.h> 30 31 #include <stdlib.h> 32 #include <string.h> 33 #include <stdarg.h> 34 35 #include "xmalloc.h" 36 #include "buffer.h" 37 #include "packet.h" 38 #include "compat.h" 39 #include "log.h" 40 #include "match.h" 41 42 int compat13 = 0; 43 int compat20 = 0; 44 int datafellows = 0; 45 46 void 47 enable_compat20(void) 48 { 49 debug("Enabling compatibility mode for protocol 2.0"); 50 compat20 = 1; 51 } 52 void 53 enable_compat13(void) 54 { 55 debug("Enabling compatibility mode for protocol 1.3"); 56 compat13 = 1; 57 } 58 /* datafellows bug compatibility */ 59 void 60 compat_datafellows(const char *version) 61 { 62 int i; 63 static struct { 64 char *pat; 65 int bugs; 66 } check[] = { 67 { "OpenSSH-2.0*," 68 "OpenSSH-2.1*," 69 "OpenSSH_2.1*," 70 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| 71 SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 72 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 73 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| 74 SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 75 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 76 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 77 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 78 SSH_OLD_FORWARD_ADDR}, 79 { "OpenSSH_2.5.0p1*," 80 "OpenSSH_2.5.1p1*", 81 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 82 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 83 SSH_OLD_FORWARD_ADDR}, 84 { "OpenSSH_2.5.0*," 85 "OpenSSH_2.5.1*," 86 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 87 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 88 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 89 SSH_OLD_FORWARD_ADDR}, 90 { "OpenSSH_2.*," 91 "OpenSSH_3.0*," 92 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 93 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, 94 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, 95 { "OpenSSH_4*", 0 }, 96 { "OpenSSH*", SSH_NEW_OPENSSH }, 97 { "*MindTerm*", 0 }, 98 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 99 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 100 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 101 SSH_BUG_FIRSTKEX }, 102 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 103 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 104 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 105 SSH_BUG_FIRSTKEX }, 106 { "2.0.13*," 107 "2.0.14*," 108 "2.0.15*," 109 "2.0.16*," 110 "2.0.17*," 111 "2.0.18*," 112 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 113 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 114 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 115 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| 116 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| 117 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 118 { "2.0.11*," 119 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 120 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 121 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 122 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 123 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 124 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 125 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 126 SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 127 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 128 SSH_BUG_PKAUTH|SSH_BUG_PKOK| 129 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 130 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| 131 SSH_BUG_FIRSTKEX }, 132 { "2.2.0*," 133 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| 134 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, 135 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| 136 SSH_BUG_FIRSTKEX }, 137 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ 138 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX| 139 SSH_BUG_RFWD_ADDR }, 140 { "3.0.*", SSH_BUG_DEBUG }, 141 { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, 142 { "1.7 SecureFX*", SSH_OLD_SESSIONID }, 143 { "1.2.18*," 144 "1.2.19*," 145 "1.2.20*," 146 "1.2.21*," 147 "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 148 { "1.3.2*", /* F-Secure */ 149 SSH_BUG_IGNOREMSG|SSH_BUG_K5USER }, 150 { "1.2.1*," 151 "1.2.2*," 152 "1.2.3*", SSH_BUG_K5USER }, 153 { "*SSH Compatible Server*", /* Netscreen */ 154 SSH_BUG_PASSWORDPAD }, 155 { "*OSU_0*," 156 "OSU_1.0*," 157 "OSU_1.1*," 158 "OSU_1.2*," 159 "OSU_1.3*," 160 "OSU_1.4*," 161 "OSU_1.5alpha1*," 162 "OSU_1.5alpha2*," 163 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, 164 { "*SSH_Version_Mapper*", 165 SSH_BUG_SCANNER }, 166 { "Probe-*", 167 SSH_BUG_PROBE }, 168 { NULL, 0 } 169 }; 170 171 /* process table, return first match */ 172 for (i = 0; check[i].pat; i++) { 173 if (match_pattern_list(version, check[i].pat, 174 strlen(check[i].pat), 0) == 1) { 175 debug("match: %s pat %s", version, check[i].pat); 176 datafellows = check[i].bugs; 177 /* Check to see if the remote side is OpenSSH and not HPN */ 178 if(strstr(version,"OpenSSH") != NULL) 179 { 180 if (strstr(version,"hpn") == NULL) 181 { 182 datafellows |= SSH_BUG_LARGEWINDOW; 183 debug("Remote is NON-HPN aware"); 184 } 185 } 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 logit("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