8998619212
the bandwidth of long fat pipes (i.e. 100Mbps+ trans-oceanic or trans-continental links). Bandwidth-delay products up to 64MB are supported. Also add support (not compiled by default) for the None cypher. The None cypher can only be enabled on non-interactive sessions (those without a pty where -T was not used) and must be enabled in both the client and server configuration files and on the client command line. Additionally, the None cypher will only be activated after authentication is complete. To enable the None cypher you must add -DNONE_CIPHER_ENABLED to CFLAGS via the make command line or in /etc/make.conf. This code is a style(9) compliant version of these features extracted from the patches published at: http://www.psc.edu/networking/projects/hpn-ssh/ Merging this patch has been a collaboration between me and Bjoern. Reviewed by: bz Approved by: re (kib), des (maintainer)
249 lines
7.0 KiB
C
249 lines
7.0 KiB
C
/* $OpenBSD: compat.c,v 1.78 2008/09/11 14:22:37 markus Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 1999, 2000, 2001, 2002 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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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include "xmalloc.h"
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#include "buffer.h"
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#include "packet.h"
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#include "compat.h"
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#include "log.h"
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#include "match.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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debug("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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debug("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;
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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-2.0*,"
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"OpenSSH-2.1*,"
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"OpenSSH_2.1*,"
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"OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
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SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
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SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
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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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SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
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{ "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
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SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
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SSH_OLD_FORWARD_ADDR},
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{ "OpenSSH_2.5.0p1*,"
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"OpenSSH_2.5.1p1*",
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SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
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SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
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SSH_OLD_FORWARD_ADDR},
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{ "OpenSSH_2.5.0*,"
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"OpenSSH_2.5.1*,"
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"OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
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SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
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{ "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
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SSH_OLD_FORWARD_ADDR},
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{ "OpenSSH_2.*,"
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"OpenSSH_3.0*,"
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"OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
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{ "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
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{ "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
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{ "OpenSSH_4*", 0 },
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{ "OpenSSH*", SSH_NEW_OPENSSH },
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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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SSH_BUG_FIRSTKEX },
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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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SSH_BUG_FIRSTKEX },
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{ "2.0.13*,"
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"2.0.14*,"
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"2.0.15*,"
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"2.0.16*,"
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"2.0.17*,"
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"2.0.18*,"
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"2.0.19*", 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|SSH_BUG_FIRSTKEX },
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{ "2.0.11*,"
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"2.0.12*", 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|SSH_BUG_FIRSTKEX },
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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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SSH_BUG_FIRSTKEX },
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{ "2.2.0*,"
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"2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
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SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
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{ "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
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SSH_BUG_FIRSTKEX },
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{ "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
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{ "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
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SSH_BUG_RFWD_ADDR },
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{ "3.0.*", SSH_BUG_DEBUG },
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{ "3.0 SecureCRT*", SSH_OLD_SESSIONID },
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{ "1.7 SecureFX*", SSH_OLD_SESSIONID },
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{ "1.2.18*,"
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"1.2.19*,"
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"1.2.20*,"
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"1.2.21*,"
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"1.2.22*", SSH_BUG_IGNOREMSG },
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{ "1.3.2*", /* F-Secure */
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SSH_BUG_IGNOREMSG },
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{ "*SSH Compatible Server*", /* Netscreen */
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SSH_BUG_PASSWORDPAD },
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{ "*OSU_0*,"
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"OSU_1.0*,"
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"OSU_1.1*,"
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"OSU_1.2*,"
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"OSU_1.3*,"
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"OSU_1.4*,"
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"OSU_1.5alpha1*,"
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"OSU_1.5alpha2*,"
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"OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
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{ "*SSH_Version_Mapper*",
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SSH_BUG_SCANNER },
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{ "Probe-*",
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SSH_BUG_PROBE },
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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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if (match_pattern_list(version, check[i].pat,
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strlen(check[i].pat), 0) == 1) {
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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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/*
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* Check to see if the remote side is OpenSSH and not
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* HPN. It is utterly strange to check it from the
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* version string and expose the option that way.
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*/
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if (strstr(version,"OpenSSH") != NULL &&
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strstr(version,"hpn") == NULL) {
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datafellows |= SSH_BUG_LARGEWINDOW;
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debug("Remote is not HPN-aware");
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}
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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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logit("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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Buffer b;
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char *orig_prop, *fix_ciphers;
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char *cp, *tmp;
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if (!(datafellows & SSH_BUG_BIGENDIANAES))
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return(cipher_prop);
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buffer_init(&b);
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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) != 0) {
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if (buffer_len(&b) > 0)
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buffer_append(&b, ",", 1);
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buffer_append(&b, cp, strlen(cp));
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}
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}
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buffer_append(&b, "\0", 1);
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fix_ciphers = xstrdup(buffer_ptr(&b));
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buffer_free(&b);
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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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