compat.c revision 224638
1114402Sru/* $OpenBSD: compat.c,v 1.78 2008/09/11 14:22:37 markus Exp $ */ 2151497Sru/* $FreeBSD$ */ 3114402Sru/* 4114402Sru * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. 5114402Sru * 6114402Sru * Redistribution and use in source and binary forms, with or without 7114402Sru * modification, are permitted provided that the following conditions 8114402Sru * are met: 9114402Sru * 1. Redistributions of source code must retain the above copyright 10114402Sru * notice, this list of conditions and the following disclaimer. 11114402Sru * 2. Redistributions in binary form must reproduce the above copyright 12114402Sru * notice, this list of conditions and the following disclaimer in the 13114402Sru * documentation and/or other materials provided with the distribution. 14114402Sru * 15114402Sru * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16114402Sru * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17114402Sru * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18114402Sru * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19114402Sru * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20151497Sru * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21114402Sru * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22114402Sru * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23114402Sru * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24114402Sru * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25114402Sru */ 26151497Sru 27114402Sru#include "includes.h" 28114402Sru 29114402Sru#include <sys/types.h> 30114402Sru 31151497Sru#include <stdlib.h> 32151497Sru#include <string.h> 33151497Sru#include <stdarg.h> 34151497Sru 35151497Sru#include "xmalloc.h" 36151497Sru#include "buffer.h" 37114402Sru#include "packet.h" 38114402Sru#include "compat.h" 39114402Sru#include "log.h" 40114402Sru#include "match.h" 41114402Sru 42114402Sruint compat13 = 0; 43114402Sruint compat20 = 0; 44114402Sruint datafellows = 0; 45114402Sru 46114402Sruvoid 47114402Sruenable_compat20(void) 48114402Sru{ 49114402Sru debug("Enabling compatibility mode for protocol 2.0"); 50114402Sru compat20 = 1; 51114402Sru} 52114402Sruvoid 53114402Sruenable_compat13(void) 54114402Sru{ 55114402Sru debug("Enabling compatibility mode for protocol 1.3"); 56114402Sru compat13 = 1; 57114402Sru} 58114402Sru/* datafellows bug compatibility */ 59114402Sruvoid 60114402Srucompat_datafellows(const char *version) 61114402Sru{ 62114402Sru int i; 63114402Sru static struct { 64114402Sru char *pat; 65114402Sru int bugs; 66114402Sru } check[] = { 67114402Sru { "OpenSSH-2.0*," 68114402Sru "OpenSSH-2.1*," 69114402Sru "OpenSSH_2.1*," 70114402Sru "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| 71114402Sru SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 72114402Sru SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 73114402Sru { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| 74114402Sru SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 75114402Sru SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 76114402Sru { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 77114402Sru SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 78114402Sru SSH_OLD_FORWARD_ADDR}, 79114402Sru { "OpenSSH_2.5.0p1*," 80114402Sru "OpenSSH_2.5.1p1*", 81114402Sru SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| 82114402Sru SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 83114402Sru SSH_OLD_FORWARD_ADDR}, 84114402Sru { "OpenSSH_2.5.0*," 85151497Sru "OpenSSH_2.5.1*," 86114402Sru "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY| 87114402Sru SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 88114402Sru { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF| 89151497Sru SSH_OLD_FORWARD_ADDR}, 90114402Sru { "OpenSSH_2.*," 91114402Sru "OpenSSH_3.0*," 92114402Sru "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, 93114402Sru { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, 94114402Sru { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, 95114402Sru { "OpenSSH_4*", 0 }, 96114402Sru { "OpenSSH*", SSH_NEW_OPENSSH }, 97114402Sru { "*MindTerm*", 0 }, 98114402Sru { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 99114402Sru SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 100114402Sru SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 101114402Sru SSH_BUG_FIRSTKEX }, 102114402Sru { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 103114402Sru SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 104114402Sru SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE| 105114402Sru SSH_BUG_FIRSTKEX }, 106114402Sru { "2.0.13*," 107114402Sru "2.0.14*," 108114402Sru "2.0.15*," 109114402Sru "2.0.16*," 110114402Sru "2.0.17*," 111114402Sru "2.0.18*," 112114402Sru "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 113151497Sru SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 114114402Sru SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 115114402Sru SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| 116114402Sru SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| 117151497Sru SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 118151497Sru { "2.0.11*," 119114402Sru "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 120151497Sru SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 121151497Sru SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 122114402Sru SSH_BUG_PKAUTH|SSH_BUG_PKOK| 123151497Sru SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 124151497Sru SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX }, 125151497Sru { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| 126151497Sru SSH_OLD_SESSIONID|SSH_BUG_DEBUG| 127151497Sru SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| 128114402Sru SSH_BUG_PKAUTH|SSH_BUG_PKOK| 129114402Sru SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| 130114402Sru SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN| 131114402Sru SSH_BUG_FIRSTKEX }, 132114402Sru { "2.2.0*," 133114402Sru "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| 134114402Sru SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX }, 135114402Sru { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5| 136114402Sru SSH_BUG_FIRSTKEX }, 137114402Sru { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ 138114402Sru { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX| 139114402Sru SSH_BUG_RFWD_ADDR }, 140114402Sru { "3.0.*", SSH_BUG_DEBUG }, 141114402Sru { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, 142114402Sru { "1.7 SecureFX*", SSH_OLD_SESSIONID }, 143114402Sru { "1.2.18*," 144114402Sru "1.2.19*," 145151497Sru "1.2.20*," 146151497Sru "1.2.21*," 147151497Sru "1.2.22*", SSH_BUG_IGNOREMSG }, 148151497Sru { "1.3.2*", /* F-Secure */ 149151497Sru SSH_BUG_IGNOREMSG }, 150151497Sru { "*SSH Compatible Server*", /* Netscreen */ 151151497Sru SSH_BUG_PASSWORDPAD }, 152151497Sru { "*OSU_0*," 153151497Sru "OSU_1.0*," 154151497Sru "OSU_1.1*," 155151497Sru "OSU_1.2*," 156151497Sru "OSU_1.3*," 157151497Sru "OSU_1.4*," 158151497Sru "OSU_1.5alpha1*," 159151497Sru "OSU_1.5alpha2*," 160151497Sru "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, 161151497Sru { "*SSH_Version_Mapper*", 162151497Sru SSH_BUG_SCANNER }, 163151497Sru { "Probe-*", 164151497Sru SSH_BUG_PROBE }, 165151497Sru { NULL, 0 } 166151497Sru }; 167151497Sru 168151497Sru /* process table, return first match */ 169151497Sru for (i = 0; check[i].pat; i++) { 170151497Sru if (match_pattern_list(version, check[i].pat, 171151497Sru strlen(check[i].pat), 0) == 1) { 172151497Sru debug("match: %s pat %s", version, check[i].pat); 173151497Sru datafellows = check[i].bugs; 174151497Sru /* 175151497Sru * Check to see if the remote side is OpenSSH and not 176151497Sru * HPN. It is utterly strange to check it from the 177151497Sru * version string and expose the option that way. 178151497Sru */ 179151497Sru if (strstr(version,"OpenSSH") != NULL && 180151497Sru strstr(version,"hpn") == NULL) { 181151497Sru datafellows |= SSH_BUG_LARGEWINDOW; 182151497Sru debug("Remote is not HPN-aware"); 183151497Sru } 184151497Sru return; 185151497Sru } 186151497Sru } 187151497Sru debug("no match: %s", version); 188151497Sru} 189151497Sru 190151497Sru#define SEP "," 191151497Sruint 192151497Sruproto_spec(const char *spec) 193151497Sru{ 194151497Sru char *s, *p, *q; 195151497Sru int ret = SSH_PROTO_UNKNOWN; 196151497Sru 197151497Sru if (spec == NULL) 198151497Sru return ret; 199151497Sru q = s = xstrdup(spec); 200151497Sru for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { 201151497Sru switch (atoi(p)) { 202151497Sru case 1: 203151497Sru if (ret == SSH_PROTO_UNKNOWN) 204151497Sru ret |= SSH_PROTO_1_PREFERRED; 205151497Sru ret |= SSH_PROTO_1; 206151497Sru break; 207151497Sru case 2: 208151497Sru ret |= SSH_PROTO_2; 209 break; 210 default: 211 logit("ignoring bad proto spec: '%s'.", p); 212 break; 213 } 214 } 215 xfree(s); 216 return ret; 217} 218 219char * 220compat_cipher_proposal(char *cipher_prop) 221{ 222 Buffer b; 223 char *orig_prop, *fix_ciphers; 224 char *cp, *tmp; 225 226 if (!(datafellows & SSH_BUG_BIGENDIANAES)) 227 return(cipher_prop); 228 229 buffer_init(&b); 230 tmp = orig_prop = xstrdup(cipher_prop); 231 while ((cp = strsep(&tmp, ",")) != NULL) { 232 if (strncmp(cp, "aes", 3) != 0) { 233 if (buffer_len(&b) > 0) 234 buffer_append(&b, ",", 1); 235 buffer_append(&b, cp, strlen(cp)); 236 } 237 } 238 buffer_append(&b, "\0", 1); 239 fix_ciphers = xstrdup(buffer_ptr(&b)); 240 buffer_free(&b); 241 xfree(orig_prop); 242 debug2("Original cipher proposal: %s", cipher_prop); 243 debug2("Compat cipher proposal: %s", fix_ciphers); 244 if (!*fix_ciphers) 245 fatal("No available ciphers found."); 246 247 return(fix_ciphers); 248} 249