| /* |
| * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| RCSID("$OpenBSD: compat.c,v 1.44 2001/04/05 10:00:06 markus Exp $"); |
| |
| #ifdef HAVE_LIBPCRE |
| # include <pcreposix.h> |
| #else /* Use native regex libraries */ |
| # ifdef HAVE_REGEX_H |
| # include <regex.h> |
| # else |
| # include "openbsd-compat/fake-regex.h" |
| # endif |
| #endif /* HAVE_LIBPCRE */ |
| |
| #include "packet.h" |
| #include "xmalloc.h" |
| #include "compat.h" |
| #include "log.h" |
| |
| int compat13 = 0; |
| int compat20 = 0; |
| int datafellows = 0; |
| |
| void |
| enable_compat20(void) |
| { |
| verbose("Enabling compatibility mode for protocol 2.0"); |
| compat20 = 1; |
| } |
| void |
| enable_compat13(void) |
| { |
| verbose("Enabling compatibility mode for protocol 1.3"); |
| compat13 = 1; |
| } |
| /* datafellows bug compatibility */ |
| void |
| compat_datafellows(const char *version) |
| { |
| int i, ret; |
| char ebuf[1024]; |
| regex_t reg; |
| static struct { |
| char *pat; |
| int bugs; |
| } check[] = { |
| { "^OpenSSH[-_]2\\.[012]", |
| SSH_OLD_SESSIONID|SSH_BUG_BANNER| |
| SSH_OLD_DHGEX }, |
| { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
| SSH_OLD_DHGEX}, |
| { "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX}, |
| { "^OpenSSH_2\\.5\\.[01]p1", |
| SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX }, |
| { "^OpenSSH_2\\.5\\.[012]", |
| SSH_OLD_DHGEX }, |
| { "^OpenSSH", 0 }, |
| { "MindTerm", 0 }, |
| { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
| SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| SSH_BUG_RSASIGMD5 }, |
| { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
| SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| SSH_BUG_RSASIGMD5 }, |
| { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
| SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
| SSH_BUG_PKOK|SSH_BUG_RSASIGMD5 }, |
| { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
| SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
| SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
| SSH_BUG_RSASIGMD5 }, |
| { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 }, |
| { "^2\\.3\\.", SSH_BUG_RSASIGMD5 }, |
| { "^2\\.[2-9]\\.", 0 }, |
| { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */ |
| { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID }, |
| { "^1\\.7 SecureFX", SSH_OLD_SESSIONID }, |
| { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG }, |
| { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG }, |
| { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */ |
| { "^SSH Compatible Server", /* Netscreen */ |
| SSH_BUG_PASSWORDPAD }, |
| { "^OSU_0", SSH_BUG_PASSWORDPAD }, |
| { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD }, |
| { "^OSU_1\\.5alpha[1-3]", |
| SSH_BUG_PASSWORDPAD }, |
| { "^SSH_Version_Mapper", |
| SSH_BUG_SCANNER }, |
| { NULL, 0 } |
| }; |
| /* process table, return first match */ |
| for (i = 0; check[i].pat; i++) { |
| ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB); |
| if (ret != 0) { |
| regerror(ret, ®, ebuf, sizeof(ebuf)); |
| ebuf[sizeof(ebuf)-1] = '\0'; |
| error("regerror: %s", ebuf); |
| continue; |
| } |
| ret = regexec(®, version, 0, NULL, 0); |
| regfree(®); |
| if (ret == 0) { |
| debug("match: %s pat %s", version, check[i].pat); |
| datafellows = check[i].bugs; |
| return; |
| } |
| } |
| debug("no match: %s", version); |
| } |
| |
| #define SEP "," |
| int |
| proto_spec(const char *spec) |
| { |
| char *s, *p, *q; |
| int ret = SSH_PROTO_UNKNOWN; |
| |
| if (spec == NULL) |
| return ret; |
| q = s = xstrdup(spec); |
| for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
| switch(atoi(p)) { |
| case 1: |
| if (ret == SSH_PROTO_UNKNOWN) |
| ret |= SSH_PROTO_1_PREFERRED; |
| ret |= SSH_PROTO_1; |
| break; |
| case 2: |
| ret |= SSH_PROTO_2; |
| break; |
| default: |
| log("ignoring bad proto spec: '%s'.", p); |
| break; |
| } |
| } |
| xfree(s); |
| return ret; |
| } |
| |
| char * |
| compat_cipher_proposal(char *cipher_prop) |
| { |
| char *orig_prop, *fix_ciphers; |
| char *cp, *tmp; |
| size_t len; |
| |
| if (!(datafellows & SSH_BUG_BIGENDIANAES)) |
| return(cipher_prop); |
| |
| len = strlen(cipher_prop) + 1; |
| fix_ciphers = xmalloc(len); |
| *fix_ciphers = '\0'; |
| tmp = orig_prop = xstrdup(cipher_prop); |
| while((cp = strsep(&tmp, ",")) != NULL) { |
| if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) { |
| if (*fix_ciphers) |
| strlcat(fix_ciphers, ",", len); |
| strlcat(fix_ciphers, cp, len); |
| } |
| } |
| xfree(orig_prop); |
| debug2("Original cipher proposal: %s", cipher_prop); |
| debug2("Compat cipher proposal: %s", fix_ciphers); |
| if (!*fix_ciphers) |
| fatal("No available ciphers found."); |
| |
| return(fix_ciphers); |
| } |