зеркало из https://github.com/Azure/sonic-openssh.git
143 строки
4.0 KiB
C
143 строки
4.0 KiB
C
/*
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* Copyright (c) 1999,2000 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 1.36 2001/02/27 11:00:11 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 "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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{ "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER },
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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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{ "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
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SSH_OLD_SESSIONID|SSH_BUG_DEBUG },
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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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{ "^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 },
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{ "^2\\.[23]\\.0", SSH_BUG_HMAC},
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{ "^2\\.[2-9]\\.", 0 },
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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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{ 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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