crypto/external/bsd/openssh/dist/compat.c

   1 /*      $NetBSD$        */
   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 1.10 2008/06/22 15:42:50 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 }