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f558cf6580
[compat.c compat.h ssh.c]
bug compat: request a dummy channel for -N (no shell) sessions +
cleanup; vinschen@redhat.com
209 lines
6.0 KiB
C
209 lines
6.0 KiB
C
/*
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* Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: compat.c,v 1.53 2001/09/20 13:50:40 markus Exp $");
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#ifdef HAVE_LIBPCRE
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# include <pcreposix.h>
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#else /* Use native regex libraries */
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# ifdef HAVE_REGEX_H
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# include <regex.h>
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# else
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# include "openbsd-compat/fake-regex.h"
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# endif
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#endif /* HAVE_LIBPCRE */
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#include "packet.h"
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#include "xmalloc.h"
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#include "compat.h"
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#include "log.h"
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int compat13 = 0;
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int compat20 = 0;
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int datafellows = 0;
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void
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enable_compat20(void)
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{
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verbose("Enabling compatibility mode for protocol 2.0");
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compat20 = 1;
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}
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void
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enable_compat13(void)
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{
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verbose("Enabling compatibility mode for protocol 1.3");
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compat13 = 1;
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}
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/* datafellows bug compatibility */
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void
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compat_datafellows(const char *version)
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{
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int i, ret;
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char ebuf[1024];
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regex_t reg;
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static struct {
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char *pat;
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int bugs;
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} check[] = {
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{ "^OpenSSH[-_]2\\.[012]",
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SSH_OLD_SESSIONID|SSH_BUG_BANNER|
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SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
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{ "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
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SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
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{ "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
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SSH_BUG_NOREKEY},
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{ "^OpenSSH_2\\.5\\.[01]p1",
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SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
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SSH_BUG_NOREKEY },
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{ "^OpenSSH_2\\.5\\.[012]",
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SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
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{ "^OpenSSH_2\\.5\\.3",
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SSH_BUG_NOREKEY },
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{ "^OpenSSH", 0 },
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{ "MindTerm", 0 },
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{ "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
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SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
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SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
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{ "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
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SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
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SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
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{ "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
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SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
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SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
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SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
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SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
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SSH_BUG_DUMMYCHAN },
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{ "^2\\.0\\.1[1-2]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
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SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
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SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
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SSH_BUG_PKAUTH|SSH_BUG_PKOK|
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SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
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SSH_BUG_DUMMYCHAN },
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{ "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
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SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
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SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
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SSH_BUG_PKAUTH|SSH_BUG_PKOK|
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SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
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SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN },
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{ "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_DEBUG|
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SSH_BUG_RSASIGMD5 },
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{ "^2\\.3\\.", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
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{ "^2\\.[2-9]\\.", SSH_BUG_DEBUG },
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{ "^3\\.0\\.", SSH_BUG_DEBUG },
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{ "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
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{ "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
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{ "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
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{ "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
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{ "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
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{ "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */
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{ "^SSH Compatible Server", /* Netscreen */
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SSH_BUG_PASSWORDPAD },
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{ "^OSU_0", SSH_BUG_PASSWORDPAD },
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{ "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
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{ "^OSU_1\\.5alpha[1-3]",
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SSH_BUG_PASSWORDPAD },
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{ "^SSH_Version_Mapper",
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SSH_BUG_SCANNER },
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{ NULL, 0 }
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};
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/* process table, return first match */
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for (i = 0; check[i].pat; i++) {
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ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
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if (ret != 0) {
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regerror(ret, ®, ebuf, sizeof(ebuf));
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ebuf[sizeof(ebuf)-1] = '\0';
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error("regerror: %s", ebuf);
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continue;
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}
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ret = regexec(®, version, 0, NULL, 0);
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regfree(®);
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if (ret == 0) {
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debug("match: %s pat %s", version, check[i].pat);
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datafellows = check[i].bugs;
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return;
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}
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}
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debug("no match: %s", version);
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}
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#define SEP ","
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int
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proto_spec(const char *spec)
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{
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char *s, *p, *q;
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int ret = SSH_PROTO_UNKNOWN;
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if (spec == NULL)
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return ret;
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q = s = xstrdup(spec);
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for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
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switch(atoi(p)) {
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case 1:
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if (ret == SSH_PROTO_UNKNOWN)
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ret |= SSH_PROTO_1_PREFERRED;
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ret |= SSH_PROTO_1;
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break;
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case 2:
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ret |= SSH_PROTO_2;
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break;
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default:
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log("ignoring bad proto spec: '%s'.", p);
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break;
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}
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}
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xfree(s);
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return ret;
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}
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char *
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compat_cipher_proposal(char *cipher_prop)
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{
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char *orig_prop, *fix_ciphers;
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char *cp, *tmp;
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size_t len;
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if (!(datafellows & SSH_BUG_BIGENDIANAES))
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return(cipher_prop);
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len = strlen(cipher_prop) + 1;
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fix_ciphers = xmalloc(len);
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*fix_ciphers = '\0';
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tmp = orig_prop = xstrdup(cipher_prop);
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while((cp = strsep(&tmp, ",")) != NULL) {
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if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
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if (*fix_ciphers)
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strlcat(fix_ciphers, ",", len);
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strlcat(fix_ciphers, cp, len);
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}
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}
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xfree(orig_prop);
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debug2("Original cipher proposal: %s", cipher_prop);
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debug2("Compat cipher proposal: %s", fix_ciphers);
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if (!*fix_ciphers)
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fatal("No available ciphers found.");
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return(fix_ciphers);
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}
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