2000-04-09 21:04:55 +00:00
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/*
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* ng_mppc.c
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2005-01-07 01:45:51 +00:00
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*/
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/*-
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2000-04-09 21:04:55 +00:00
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* Copyright (c) 1996-2000 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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2000-10-24 17:32:45 +00:00
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* Author: Archie Cobbs <archie@freebsd.org>
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2000-04-09 21:04:55 +00:00
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*
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* $Whistle: ng_mppc.c,v 1.4 1999/11/25 00:10:12 archie Exp $
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* $FreeBSD$
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*/
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/*
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* Microsoft PPP compression (MPPC) and encryption (MPPE) netgraph node type.
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*
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* You must define one or both of the NETGRAPH_MPPC_COMPRESSION and/or
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* NETGRAPH_MPPC_ENCRYPTION options for this node type to be useful.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_mppc.h>
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#include "opt_netgraph.h"
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#if !defined(NETGRAPH_MPPC_COMPRESSION) && !defined(NETGRAPH_MPPC_ENCRYPTION)
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2005-10-14 23:17:45 +00:00
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#ifdef KLD_MODULE
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/* XXX NETGRAPH_MPPC_COMPRESSION isn't functional yet */
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#define NETGRAPH_MPPC_ENCRYPTION
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#else
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/* This case is indicative of an error in sys/conf files */
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2000-04-09 21:04:55 +00:00
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#error Need either NETGRAPH_MPPC_COMPRESSION or NETGRAPH_MPPC_ENCRYPTION
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#endif
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2005-10-14 23:17:45 +00:00
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#endif
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2000-04-09 21:04:55 +00:00
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2001-01-10 07:13:58 +00:00
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#ifdef NG_SEPARATE_MALLOC
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MALLOC_DEFINE(M_NETGRAPH_MPPC, "netgraph_mppc", "netgraph mppc node ");
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#else
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#define M_NETGRAPH_MPPC M_NETGRAPH
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#endif
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2000-04-09 21:04:55 +00:00
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#ifdef NETGRAPH_MPPC_COMPRESSION
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/* XXX this file doesn't exist yet, but hopefully someday it will... */
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#include <net/mppc.h>
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#endif
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#ifdef NETGRAPH_MPPC_ENCRYPTION
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#include <crypto/rc4/rc4.h>
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#endif
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#include <crypto/sha1.h>
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/* Decompression blowup */
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#define MPPC_DECOMP_BUFSIZE 8092 /* allocate buffer this big */
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#define MPPC_DECOMP_SAFETY 100 /* plus this much margin */
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/* MPPC/MPPE header length */
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#define MPPC_HDRLEN 2
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/* Key length */
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#define KEYLEN(b) (((b) & MPPE_128) ? 16 : 8)
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2002-12-14 00:56:07 +00:00
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/*
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* When packets are lost with MPPE, we may have to re-key arbitrarily
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* many times to 'catch up' to the new jumped-ahead sequence number.
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* Since this can be expensive, we pose a limit on how many re-keyings
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* we will do at one time to avoid a possible D.O.S. vulnerability.
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* This should instead be a configurable parameter.
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*/
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#define MPPE_MAX_REKEY 1000
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2000-04-09 21:04:55 +00:00
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/* MPPC packet header bits */
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#define MPPC_FLAG_FLUSHED 0x8000 /* xmitter reset state */
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#define MPPC_FLAG_RESTART 0x4000 /* compress history restart */
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#define MPPC_FLAG_COMPRESSED 0x2000 /* packet is compresed */
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#define MPPC_FLAG_ENCRYPTED 0x1000 /* packet is encrypted */
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#define MPPC_CCOUNT_MASK 0x0fff /* sequence number mask */
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2007-05-04 16:05:58 +00:00
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#define MPPC_CCOUNT_INC(d) ((d) = (((d) + 1) & MPPC_CCOUNT_MASK))
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2000-04-09 21:04:55 +00:00
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#define MPPE_UPDATE_MASK 0xff /* coherency count when we're */
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#define MPPE_UPDATE_FLAG 0xff /* supposed to update key */
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#define MPPC_COMP_OK 0x05
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#define MPPC_DECOMP_OK 0x05
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/* Per direction info */
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struct ng_mppc_dir {
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struct ng_mppc_config cfg; /* configuration */
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hook_p hook; /* netgraph hook */
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u_int16_t cc:12; /* coherency count */
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u_char flushed; /* clean history (xmit only) */
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#ifdef NETGRAPH_MPPC_COMPRESSION
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u_char *history; /* compression history */
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#endif
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#ifdef NETGRAPH_MPPC_ENCRYPTION
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u_char key[MPPE_KEY_LEN]; /* session key */
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struct rc4_state rc4; /* rc4 state */
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#endif
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};
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/* Node private data */
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struct ng_mppc_private {
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struct ng_mppc_dir xmit; /* compress/encrypt config */
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struct ng_mppc_dir recv; /* decompress/decrypt config */
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2001-01-06 00:46:47 +00:00
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ng_ID_t ctrlnode; /* path to controlling node */
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2000-04-09 21:04:55 +00:00
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};
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typedef struct ng_mppc_private *priv_p;
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/* Netgraph node methods */
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static ng_constructor_t ng_mppc_constructor;
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static ng_rcvmsg_t ng_mppc_rcvmsg;
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2001-01-06 00:46:47 +00:00
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static ng_shutdown_t ng_mppc_shutdown;
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2000-04-09 21:04:55 +00:00
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static ng_newhook_t ng_mppc_newhook;
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static ng_rcvdata_t ng_mppc_rcvdata;
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static ng_disconnect_t ng_mppc_disconnect;
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/* Helper functions */
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static int ng_mppc_compress(node_p node,
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2007-05-11 14:36:02 +00:00
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struct mbuf **datap);
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2000-04-09 21:04:55 +00:00
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static int ng_mppc_decompress(node_p node,
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2007-05-11 14:36:02 +00:00
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struct mbuf **datap);
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2007-05-18 15:28:01 +00:00
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#ifdef NETGRAPH_MPPC_ENCRYPTION
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2000-04-09 21:04:55 +00:00
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static void ng_mppc_getkey(const u_char *h, u_char *h2, int len);
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static void ng_mppc_updatekey(u_int32_t bits,
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u_char *key0, u_char *key, struct rc4_state *rc4);
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2007-05-18 15:28:01 +00:00
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#endif
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2000-04-09 21:04:55 +00:00
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static void ng_mppc_reset_req(node_p node);
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/* Node type descriptor */
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static struct ng_type ng_mppc_typestruct = {
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2004-05-29 00:51:19 +00:00
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.version = NG_ABI_VERSION,
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.name = NG_MPPC_NODE_TYPE,
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.constructor = ng_mppc_constructor,
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.rcvmsg = ng_mppc_rcvmsg,
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.shutdown = ng_mppc_shutdown,
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.newhook = ng_mppc_newhook,
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.rcvdata = ng_mppc_rcvdata,
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.disconnect = ng_mppc_disconnect,
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2000-04-09 21:04:55 +00:00
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};
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NETGRAPH_INIT(mppc, &ng_mppc_typestruct);
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2003-02-05 19:11:11 +00:00
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#ifdef NETGRAPH_MPPC_ENCRYPTION
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/* Depend on separate rc4 module */
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MODULE_DEPEND(ng_mppc, rc4, 1, 1, 1);
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#endif
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2001-12-15 02:07:32 +00:00
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/* Fixed bit pattern to weaken keysize down to 40 or 56 bits */
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2000-04-09 21:04:55 +00:00
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static const u_char ng_mppe_weakenkey[3] = { 0xd1, 0x26, 0x9e };
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#define ERROUT(x) do { error = (x); goto done; } while (0)
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/************************************************************************
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NETGRAPH NODE STUFF
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************************************************************************/
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/*
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* Node type constructor
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*/
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static int
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2001-01-06 00:46:47 +00:00
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ng_mppc_constructor(node_p node)
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2000-04-09 21:04:55 +00:00
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{
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priv_p priv;
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/* Allocate private structure */
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2008-10-23 15:53:51 +00:00
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priv = malloc(sizeof(*priv), M_NETGRAPH_MPPC, M_NOWAIT | M_ZERO);
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2000-04-09 21:04:55 +00:00
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if (priv == NULL)
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return (ENOMEM);
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2001-01-08 05:34:06 +00:00
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NG_NODE_SET_PRIVATE(node, priv);
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2000-04-09 21:04:55 +00:00
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2005-06-03 09:06:00 +00:00
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/* This node is not thread safe. */
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NG_NODE_FORCE_WRITER(node);
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2000-04-09 21:04:55 +00:00
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/* Done */
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return (0);
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}
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/*
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* Give our OK for a hook to be added
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*/
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static int
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ng_mppc_newhook(node_p node, hook_p hook, const char *name)
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{
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2001-01-08 05:34:06 +00:00
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const priv_p priv = NG_NODE_PRIVATE(node);
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2000-04-09 21:04:55 +00:00
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hook_p *hookPtr;
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/* Check hook name */
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if (strcmp(name, NG_MPPC_HOOK_COMP) == 0)
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hookPtr = &priv->xmit.hook;
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else if (strcmp(name, NG_MPPC_HOOK_DECOMP) == 0)
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hookPtr = &priv->recv.hook;
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else
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return (EINVAL);
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/* See if already connected */
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if (*hookPtr != NULL)
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return (EISCONN);
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/* OK */
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*hookPtr = hook;
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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2001-01-06 00:46:47 +00:00
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ng_mppc_rcvmsg(node_p node, item_p item, hook_p lasthook)
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2000-04-09 21:04:55 +00:00
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{
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2001-01-08 05:34:06 +00:00
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const priv_p priv = NG_NODE_PRIVATE(node);
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2000-04-09 21:04:55 +00:00
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struct ng_mesg *resp = NULL;
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int error = 0;
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2001-01-06 00:46:47 +00:00
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struct ng_mesg *msg;
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2000-04-09 21:04:55 +00:00
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2001-01-06 00:46:47 +00:00
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NGI_GET_MSG(item, msg);
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2000-04-09 21:04:55 +00:00
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switch (msg->header.typecookie) {
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case NGM_MPPC_COOKIE:
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switch (msg->header.cmd) {
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case NGM_MPPC_CONFIG_COMP:
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case NGM_MPPC_CONFIG_DECOMP:
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{
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struct ng_mppc_config *const cfg
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= (struct ng_mppc_config *)msg->data;
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const int isComp =
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msg->header.cmd == NGM_MPPC_CONFIG_COMP;
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struct ng_mppc_dir *const d = isComp ?
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&priv->xmit : &priv->recv;
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/* Check configuration */
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if (msg->header.arglen != sizeof(*cfg))
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ERROUT(EINVAL);
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if (cfg->enable) {
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if ((cfg->bits & ~MPPC_VALID_BITS) != 0)
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ERROUT(EINVAL);
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#ifndef NETGRAPH_MPPC_COMPRESSION
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if ((cfg->bits & MPPC_BIT) != 0)
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ERROUT(EPROTONOSUPPORT);
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#endif
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#ifndef NETGRAPH_MPPC_ENCRYPTION
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if ((cfg->bits & MPPE_BITS) != 0)
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ERROUT(EPROTONOSUPPORT);
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#endif
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} else
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cfg->bits = 0;
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/* Save return address so we can send reset-req's */
|
2002-12-14 00:56:07 +00:00
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if (!isComp)
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priv->ctrlnode = NGI_RETADDR(item);
|
2000-04-09 21:04:55 +00:00
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/* Configuration is OK, reset to it */
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d->cfg = *cfg;
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#ifdef NETGRAPH_MPPC_COMPRESSION
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/* Initialize state buffers for compression */
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if (d->history != NULL) {
|
2008-10-23 15:53:51 +00:00
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free(d->history, M_NETGRAPH_MPPC);
|
2000-04-09 21:04:55 +00:00
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d->history = NULL;
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}
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if ((cfg->bits & MPPC_BIT) != 0) {
|
2008-10-23 20:26:15 +00:00
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d->history = malloc(isComp ?
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|
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MPPC_SizeOfCompressionHistory() :
|
2000-04-09 21:04:55 +00:00
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MPPC_SizeOfDecompressionHistory(),
|
2001-01-10 07:13:58 +00:00
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M_NETGRAPH_MPPC, M_NOWAIT);
|
2000-04-09 21:04:55 +00:00
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if (d->history == NULL)
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ERROUT(ENOMEM);
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if (isComp)
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MPPC_InitCompressionHistory(d->history);
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else {
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MPPC_InitDecompressionHistory(
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d->history);
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}
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}
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#endif
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#ifdef NETGRAPH_MPPC_ENCRYPTION
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/* Generate initial session keys for encryption */
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|
if ((cfg->bits & MPPE_BITS) != 0) {
|
|
|
|
const int keylen = KEYLEN(cfg->bits);
|
|
|
|
|
|
|
|
bcopy(cfg->startkey, d->key, keylen);
|
|
|
|
ng_mppc_getkey(cfg->startkey, d->key, keylen);
|
2001-12-15 02:07:32 +00:00
|
|
|
if ((cfg->bits & MPPE_40) != 0)
|
|
|
|
bcopy(&ng_mppe_weakenkey, d->key, 3);
|
|
|
|
else if ((cfg->bits & MPPE_56) != 0)
|
|
|
|
bcopy(&ng_mppe_weakenkey, d->key, 1);
|
2000-04-09 21:04:55 +00:00
|
|
|
rc4_init(&d->rc4, d->key, keylen);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Initialize other state */
|
|
|
|
d->cc = 0;
|
|
|
|
d->flushed = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case NGM_MPPC_RESETREQ:
|
|
|
|
ng_mppc_reset_req(node);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
error = EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
error = EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
done:
|
2001-01-06 00:46:47 +00:00
|
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
|
|
NG_FREE_MSG(msg);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Receive incoming data on our hook.
|
|
|
|
*/
|
|
|
|
static int
|
2001-01-06 00:46:47 +00:00
|
|
|
ng_mppc_rcvdata(hook_p hook, item_p item)
|
2000-04-09 21:04:55 +00:00
|
|
|
{
|
2001-01-08 05:34:06 +00:00
|
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
int error;
|
2001-01-06 00:46:47 +00:00
|
|
|
struct mbuf *m;
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2001-01-06 00:46:47 +00:00
|
|
|
NGI_GET_M(item, m);
|
2000-04-09 21:04:55 +00:00
|
|
|
/* Compress and/or encrypt */
|
|
|
|
if (hook == priv->xmit.hook) {
|
|
|
|
if (!priv->xmit.cfg.enable) {
|
2001-01-06 00:46:47 +00:00
|
|
|
NG_FREE_M(m);
|
|
|
|
NG_FREE_ITEM(item);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (ENXIO);
|
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
if ((error = ng_mppc_compress(node, &m)) != 0) {
|
2001-01-06 00:46:47 +00:00
|
|
|
NG_FREE_ITEM(item);
|
2000-04-09 21:04:55 +00:00
|
|
|
return(error);
|
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
NG_FWD_NEW_DATA(error, item, priv->xmit.hook, m);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Decompress and/or decrypt */
|
|
|
|
if (hook == priv->recv.hook) {
|
|
|
|
if (!priv->recv.cfg.enable) {
|
2001-01-06 00:46:47 +00:00
|
|
|
NG_FREE_M(m);
|
|
|
|
NG_FREE_ITEM(item);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (ENXIO);
|
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
if ((error = ng_mppc_decompress(node, &m)) != 0) {
|
2001-01-06 00:46:47 +00:00
|
|
|
NG_FREE_ITEM(item);
|
2002-08-22 00:30:03 +00:00
|
|
|
if (error == EINVAL && priv->ctrlnode != 0) {
|
2000-04-09 21:04:55 +00:00
|
|
|
struct ng_mesg *msg;
|
|
|
|
|
|
|
|
/* Need to send a reset-request */
|
|
|
|
NG_MKMESSAGE(msg, NGM_MPPC_COOKIE,
|
|
|
|
NGM_MPPC_RESETREQ, 0, M_NOWAIT);
|
|
|
|
if (msg == NULL)
|
|
|
|
return (error);
|
2001-01-06 00:46:47 +00:00
|
|
|
NG_SEND_MSG_ID(error, node, msg,
|
2002-08-22 00:30:03 +00:00
|
|
|
priv->ctrlnode, 0);
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
return (error);
|
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
NG_FWD_NEW_DATA(error, item, priv->recv.hook, m);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Oops */
|
2001-12-10 08:09:49 +00:00
|
|
|
panic("%s: unknown hook", __func__);
|
2001-09-12 08:38:13 +00:00
|
|
|
#ifdef RESTARTABLE_PANICS
|
|
|
|
return (EINVAL);
|
|
|
|
#endif
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Destroy node
|
|
|
|
*/
|
|
|
|
static int
|
2001-01-06 00:46:47 +00:00
|
|
|
ng_mppc_shutdown(node_p node)
|
2000-04-09 21:04:55 +00:00
|
|
|
{
|
2001-01-08 05:34:06 +00:00
|
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Take down netgraph node */
|
|
|
|
#ifdef NETGRAPH_MPPC_COMPRESSION
|
|
|
|
if (priv->xmit.history != NULL)
|
2008-10-23 15:53:51 +00:00
|
|
|
free(priv->xmit.history, M_NETGRAPH_MPPC);
|
2000-04-09 21:04:55 +00:00
|
|
|
if (priv->recv.history != NULL)
|
2008-10-23 15:53:51 +00:00
|
|
|
free(priv->recv.history, M_NETGRAPH_MPPC);
|
2000-04-09 21:04:55 +00:00
|
|
|
#endif
|
|
|
|
bzero(priv, sizeof(*priv));
|
2008-10-23 15:53:51 +00:00
|
|
|
free(priv, M_NETGRAPH_MPPC);
|
2001-01-08 05:34:06 +00:00
|
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
|
|
NG_NODE_UNREF(node); /* let the node escape */
|
2000-04-09 21:04:55 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Hook disconnection
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
ng_mppc_disconnect(hook_p hook)
|
|
|
|
{
|
2001-01-08 05:34:06 +00:00
|
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Zero out hook pointer */
|
|
|
|
if (hook == priv->xmit.hook)
|
|
|
|
priv->xmit.hook = NULL;
|
|
|
|
if (hook == priv->recv.hook)
|
|
|
|
priv->recv.hook = NULL;
|
|
|
|
|
|
|
|
/* Go away if no longer connected */
|
2001-01-08 05:34:06 +00:00
|
|
|
if ((NG_NODE_NUMHOOKS(node) == 0)
|
|
|
|
&& NG_NODE_IS_VALID(node))
|
2001-01-06 00:46:47 +00:00
|
|
|
ng_rmnode_self(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/************************************************************************
|
|
|
|
HELPER STUFF
|
|
|
|
************************************************************************/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Compress/encrypt a packet and put the result in a new mbuf at *resultp.
|
|
|
|
* The original mbuf is not free'd.
|
|
|
|
*/
|
|
|
|
static int
|
2007-05-11 14:36:02 +00:00
|
|
|
ng_mppc_compress(node_p node, struct mbuf **datap)
|
2000-04-09 21:04:55 +00:00
|
|
|
{
|
2001-01-08 05:34:06 +00:00
|
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
struct ng_mppc_dir *const d = &priv->xmit;
|
|
|
|
u_int16_t header;
|
2007-05-11 14:36:02 +00:00
|
|
|
struct mbuf *m = *datap;
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2009-01-18 19:25:36 +00:00
|
|
|
/* We must own the mbuf chain exclusively to modify it. */
|
|
|
|
m = m_unshare(m, M_DONTWAIT);
|
|
|
|
if (m == NULL)
|
|
|
|
return (ENOMEM);
|
|
|
|
|
2000-04-09 21:04:55 +00:00
|
|
|
/* Initialize */
|
|
|
|
header = d->cc;
|
2007-05-04 16:12:54 +00:00
|
|
|
|
|
|
|
/* Always set the flushed bit in stateless mode */
|
|
|
|
if (d->flushed || ((d->cfg.bits & MPPE_STATELESS) != 0)) {
|
2000-04-09 21:04:55 +00:00
|
|
|
header |= MPPC_FLAG_FLUSHED;
|
|
|
|
d->flushed = 0;
|
|
|
|
}
|
|
|
|
|
2007-05-11 14:36:02 +00:00
|
|
|
/* Compress packet (if compression enabled) */
|
2000-04-09 21:04:55 +00:00
|
|
|
#ifdef NETGRAPH_MPPC_COMPRESSION
|
|
|
|
if ((d->cfg.bits & MPPC_BIT) != 0) {
|
|
|
|
u_short flags = MPPC_MANDATORY_COMPRESS_FLAGS;
|
2007-05-11 14:36:02 +00:00
|
|
|
u_char *inbuf, *outbuf;
|
2009-01-18 21:09:34 +00:00
|
|
|
int outlen, inlen, ina;
|
2000-04-09 21:04:55 +00:00
|
|
|
u_char *source, *dest;
|
|
|
|
u_long sourceCnt, destCnt;
|
|
|
|
int rtn;
|
|
|
|
|
2007-05-11 14:36:02 +00:00
|
|
|
/* Work with contiguous regions of memory. */
|
|
|
|
inlen = m->m_pkthdr.len;
|
2009-01-18 21:09:34 +00:00
|
|
|
if (m->m_next == NULL) {
|
|
|
|
inbuf = mtod(m, u_char *);
|
|
|
|
ina = 0;
|
|
|
|
} else {
|
|
|
|
inbuf = malloc(inlen, M_NETGRAPH_MPPC, M_NOWAIT);
|
|
|
|
if (inbuf == NULL)
|
|
|
|
goto err1;
|
|
|
|
m_copydata(m, 0, inlen, (caddr_t)inbuf);
|
|
|
|
ina = 1;
|
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
|
|
|
|
outlen = MPPC_MAX_BLOWUP(inlen);
|
|
|
|
outbuf = malloc(outlen, M_NETGRAPH_MPPC, M_NOWAIT);
|
|
|
|
if (outbuf == NULL) {
|
2009-01-18 21:09:34 +00:00
|
|
|
if (ina)
|
|
|
|
free(inbuf, M_NETGRAPH_MPPC);
|
2008-12-06 23:00:48 +00:00
|
|
|
err1:
|
|
|
|
m_freem(m);
|
|
|
|
MPPC_InitCompressionHistory(d->history);
|
|
|
|
d->flushed = 1;
|
2007-05-11 14:36:02 +00:00
|
|
|
return (ENOMEM);
|
|
|
|
}
|
|
|
|
|
2000-04-09 21:04:55 +00:00
|
|
|
/* Prepare to compress */
|
|
|
|
source = inbuf;
|
|
|
|
sourceCnt = inlen;
|
2007-05-11 14:36:02 +00:00
|
|
|
dest = outbuf;
|
|
|
|
destCnt = outlen;
|
2000-04-09 21:04:55 +00:00
|
|
|
if ((d->cfg.bits & MPPE_STATELESS) == 0)
|
|
|
|
flags |= MPPC_SAVE_HISTORY;
|
|
|
|
|
|
|
|
/* Compress */
|
|
|
|
rtn = MPPC_Compress(&source, &dest, &sourceCnt,
|
|
|
|
&destCnt, d->history, flags, 0);
|
|
|
|
|
|
|
|
/* Check return value */
|
2001-12-10 08:09:49 +00:00
|
|
|
KASSERT(rtn != MPPC_INVALID, ("%s: invalid", __func__));
|
2000-04-09 21:04:55 +00:00
|
|
|
if ((rtn & MPPC_EXPANDED) == 0
|
|
|
|
&& (rtn & MPPC_COMP_OK) == MPPC_COMP_OK) {
|
|
|
|
outlen -= destCnt;
|
|
|
|
header |= MPPC_FLAG_COMPRESSED;
|
|
|
|
if ((rtn & MPPC_RESTART_HISTORY) != 0)
|
|
|
|
header |= MPPC_FLAG_RESTART;
|
2007-05-11 14:36:02 +00:00
|
|
|
|
|
|
|
/* Replace m by the compresed one. */
|
2009-01-18 19:25:36 +00:00
|
|
|
m_copyback(m, 0, outlen, (caddr_t)outbuf);
|
|
|
|
if (m->m_pkthdr.len < outlen) {
|
|
|
|
m_freem(m);
|
|
|
|
m = NULL;
|
|
|
|
} else if (outlen < m->m_pkthdr.len)
|
|
|
|
m_adj(m, outlen - m->m_pkthdr.len);
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
d->flushed = (rtn & MPPC_EXPANDED) != 0
|
|
|
|
|| (flags & MPPC_SAVE_HISTORY) == 0;
|
|
|
|
|
2009-01-18 21:09:34 +00:00
|
|
|
if (ina)
|
|
|
|
free(inbuf, M_NETGRAPH_MPPC);
|
2007-05-11 14:36:02 +00:00
|
|
|
free(outbuf, M_NETGRAPH_MPPC);
|
|
|
|
|
2009-01-18 19:25:36 +00:00
|
|
|
/* Check mbuf chain reload result. */
|
2008-12-06 23:00:48 +00:00
|
|
|
if (m == NULL) {
|
|
|
|
if (!d->flushed) {
|
|
|
|
MPPC_InitCompressionHistory(d->history);
|
|
|
|
d->flushed = 1;
|
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
return (ENOMEM);
|
2008-12-06 23:00:48 +00:00
|
|
|
}
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
2007-05-11 14:36:02 +00:00
|
|
|
#endif
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Now encrypt packet (if encryption enabled) */
|
|
|
|
#ifdef NETGRAPH_MPPC_ENCRYPTION
|
|
|
|
if ((d->cfg.bits & MPPE_BITS) != 0) {
|
2007-05-11 14:36:02 +00:00
|
|
|
struct mbuf *m1;
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2007-05-04 16:20:47 +00:00
|
|
|
/* Set header bits */
|
2000-04-09 21:04:55 +00:00
|
|
|
header |= MPPC_FLAG_ENCRYPTED;
|
|
|
|
|
|
|
|
/* Update key if it's time */
|
|
|
|
if ((d->cfg.bits & MPPE_STATELESS) != 0
|
|
|
|
|| (d->cc & MPPE_UPDATE_MASK) == MPPE_UPDATE_FLAG) {
|
2007-05-04 16:20:47 +00:00
|
|
|
ng_mppc_updatekey(d->cfg.bits,
|
|
|
|
d->cfg.startkey, d->key, &d->rc4);
|
|
|
|
} else if ((header & MPPC_FLAG_FLUSHED) != 0) {
|
|
|
|
/* Need to reset key if we say we did
|
|
|
|
and ng_mppc_updatekey wasn't called to do it also. */
|
|
|
|
rc4_init(&d->rc4, d->key, KEYLEN(d->cfg.bits));
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Encrypt packet */
|
2007-05-11 14:36:02 +00:00
|
|
|
m1 = m;
|
|
|
|
while (m1) {
|
|
|
|
rc4_crypt(&d->rc4, mtod(m1, u_char *),
|
|
|
|
mtod(m1, u_char *), m1->m_len);
|
|
|
|
m1 = m1->m_next;
|
|
|
|
}
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2007-05-04 16:05:58 +00:00
|
|
|
/* Update coherency count for next time (12 bit arithmetic) */
|
|
|
|
MPPC_CCOUNT_INC(d->cc);
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Install header */
|
2007-05-11 14:36:02 +00:00
|
|
|
M_PREPEND(m, MPPC_HDRLEN, M_DONTWAIT);
|
|
|
|
if (m != NULL)
|
|
|
|
*(mtod(m, uint16_t *)) = htons(header);
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2007-05-11 14:36:02 +00:00
|
|
|
*datap = m;
|
|
|
|
return (*datap == NULL ? ENOBUFS : 0);
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Decompress/decrypt packet and put the result in a new mbuf at *resultp.
|
|
|
|
* The original mbuf is not free'd.
|
|
|
|
*/
|
|
|
|
static int
|
2007-05-11 14:36:02 +00:00
|
|
|
ng_mppc_decompress(node_p node, struct mbuf **datap)
|
2000-04-09 21:04:55 +00:00
|
|
|
{
|
2001-01-08 05:34:06 +00:00
|
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
struct ng_mppc_dir *const d = &priv->recv;
|
2002-12-14 00:56:07 +00:00
|
|
|
u_int16_t header, cc;
|
|
|
|
u_int numLost;
|
2007-05-11 14:36:02 +00:00
|
|
|
struct mbuf *m = *datap;
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2009-01-18 19:25:36 +00:00
|
|
|
/* We must own the mbuf chain exclusively to modify it. */
|
|
|
|
m = m_unshare(m, M_DONTWAIT);
|
|
|
|
if (m == NULL)
|
|
|
|
return (ENOMEM);
|
|
|
|
|
2000-04-09 21:04:55 +00:00
|
|
|
/* Pull off header */
|
2007-05-11 14:36:02 +00:00
|
|
|
if (m->m_pkthdr.len < MPPC_HDRLEN) {
|
|
|
|
m_freem(m);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (EINVAL);
|
2007-05-11 14:36:02 +00:00
|
|
|
}
|
2000-04-09 21:04:55 +00:00
|
|
|
m_copydata(m, 0, MPPC_HDRLEN, (caddr_t)&header);
|
2002-02-18 20:35:27 +00:00
|
|
|
header = ntohs(header);
|
2000-04-09 21:04:55 +00:00
|
|
|
cc = (header & MPPC_CCOUNT_MASK);
|
2007-05-11 14:36:02 +00:00
|
|
|
m_adj(m, MPPC_HDRLEN);
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2002-12-14 00:56:07 +00:00
|
|
|
/* Check for an unexpected jump in the sequence number */
|
2000-04-09 21:04:55 +00:00
|
|
|
numLost = ((cc - d->cc) & MPPC_CCOUNT_MASK);
|
|
|
|
|
|
|
|
/* If flushed bit set, we can always handle packet */
|
|
|
|
if ((header & MPPC_FLAG_FLUSHED) != 0) {
|
|
|
|
#ifdef NETGRAPH_MPPC_COMPRESSION
|
|
|
|
if (d->history != NULL)
|
|
|
|
MPPC_InitDecompressionHistory(d->history);
|
|
|
|
#endif
|
|
|
|
#ifdef NETGRAPH_MPPC_ENCRYPTION
|
|
|
|
if ((d->cfg.bits & MPPE_BITS) != 0) {
|
2002-12-14 00:56:07 +00:00
|
|
|
u_int rekey;
|
|
|
|
|
|
|
|
/* How many times are we going to have to re-key? */
|
|
|
|
rekey = ((d->cfg.bits & MPPE_STATELESS) != 0) ?
|
|
|
|
numLost : (numLost / (MPPE_UPDATE_MASK + 1));
|
|
|
|
if (rekey > MPPE_MAX_REKEY) {
|
|
|
|
log(LOG_ERR, "%s: too many (%d) packets"
|
|
|
|
" dropped, disabling node %p!",
|
|
|
|
__func__, numLost, node);
|
|
|
|
priv->recv.cfg.enable = 0;
|
|
|
|
goto failed;
|
|
|
|
}
|
2000-04-09 21:04:55 +00:00
|
|
|
|
2002-12-14 00:56:07 +00:00
|
|
|
/* Re-key as necessary to catch up to peer */
|
2000-04-09 21:04:55 +00:00
|
|
|
while (d->cc != cc) {
|
2002-12-14 00:56:07 +00:00
|
|
|
if ((d->cfg.bits & MPPE_STATELESS) != 0
|
2000-04-09 21:04:55 +00:00
|
|
|
|| (d->cc & MPPE_UPDATE_MASK)
|
|
|
|
== MPPE_UPDATE_FLAG) {
|
|
|
|
ng_mppc_updatekey(d->cfg.bits,
|
|
|
|
d->cfg.startkey, d->key, &d->rc4);
|
|
|
|
}
|
2007-05-04 16:05:58 +00:00
|
|
|
MPPC_CCOUNT_INC(d->cc);
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Reset key (except in stateless mode, see below) */
|
|
|
|
if ((d->cfg.bits & MPPE_STATELESS) == 0)
|
|
|
|
rc4_init(&d->rc4, d->key, KEYLEN(d->cfg.bits));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
d->cc = cc; /* skip over lost seq numbers */
|
|
|
|
numLost = 0; /* act like no packets were lost */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Can't decode non-sequential packets without a flushed bit */
|
|
|
|
if (numLost != 0)
|
|
|
|
goto failed;
|
|
|
|
|
|
|
|
/* Decrypt packet */
|
|
|
|
if ((header & MPPC_FLAG_ENCRYPTED) != 0) {
|
2007-05-11 14:36:02 +00:00
|
|
|
#ifdef NETGRAPH_MPPC_ENCRYPTION
|
|
|
|
struct mbuf *m1;
|
|
|
|
#endif
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Are we not expecting encryption? */
|
|
|
|
if ((d->cfg.bits & MPPE_BITS) == 0) {
|
|
|
|
log(LOG_ERR, "%s: rec'd unexpectedly %s packet",
|
2001-12-10 08:09:49 +00:00
|
|
|
__func__, "encrypted");
|
2000-04-09 21:04:55 +00:00
|
|
|
goto failed;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef NETGRAPH_MPPC_ENCRYPTION
|
|
|
|
/* Update key if it's time (always in stateless mode) */
|
|
|
|
if ((d->cfg.bits & MPPE_STATELESS) != 0
|
|
|
|
|| (d->cc & MPPE_UPDATE_MASK) == MPPE_UPDATE_FLAG) {
|
|
|
|
ng_mppc_updatekey(d->cfg.bits,
|
|
|
|
d->cfg.startkey, d->key, &d->rc4);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Decrypt packet */
|
2007-05-11 14:36:02 +00:00
|
|
|
m1 = m;
|
|
|
|
while (m1 != NULL) {
|
|
|
|
rc4_crypt(&d->rc4, mtod(m1, u_char *),
|
|
|
|
mtod(m1, u_char *), m1->m_len);
|
|
|
|
m1 = m1->m_next;
|
|
|
|
}
|
2000-04-09 21:04:55 +00:00
|
|
|
#endif
|
|
|
|
} else {
|
|
|
|
|
|
|
|
/* Are we expecting encryption? */
|
|
|
|
if ((d->cfg.bits & MPPE_BITS) != 0) {
|
|
|
|
log(LOG_ERR, "%s: rec'd unexpectedly %s packet",
|
2001-12-10 08:09:49 +00:00
|
|
|
__func__, "unencrypted");
|
2000-04-09 21:04:55 +00:00
|
|
|
goto failed;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Update coherency count for next time (12 bit arithmetic) */
|
2007-05-04 16:05:58 +00:00
|
|
|
MPPC_CCOUNT_INC(d->cc);
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Check for unexpected compressed packet */
|
|
|
|
if ((header & MPPC_FLAG_COMPRESSED) != 0
|
|
|
|
&& (d->cfg.bits & MPPC_BIT) == 0) {
|
|
|
|
log(LOG_ERR, "%s: rec'd unexpectedly %s packet",
|
2001-12-10 08:09:49 +00:00
|
|
|
__func__, "compressed");
|
2000-04-09 21:04:55 +00:00
|
|
|
failed:
|
2007-05-11 14:36:02 +00:00
|
|
|
m_freem(m);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (EINVAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef NETGRAPH_MPPC_COMPRESSION
|
|
|
|
/* Decompress packet */
|
|
|
|
if ((header & MPPC_FLAG_COMPRESSED) != 0) {
|
|
|
|
int flags = MPPC_MANDATORY_DECOMPRESS_FLAGS;
|
2009-01-18 21:09:34 +00:00
|
|
|
u_char *inbuf, *outbuf;
|
|
|
|
int inlen, outlen, ina;
|
|
|
|
u_char *source, *dest;
|
2000-04-09 21:04:55 +00:00
|
|
|
u_long sourceCnt, destCnt;
|
2009-01-18 21:09:34 +00:00
|
|
|
int rtn;
|
2007-05-11 14:36:02 +00:00
|
|
|
|
|
|
|
/* Copy payload into a contiguous region of memory. */
|
2009-01-18 21:09:34 +00:00
|
|
|
inlen = m->m_pkthdr.len;
|
|
|
|
if (m->m_next == NULL) {
|
|
|
|
inbuf = mtod(m, u_char *);
|
|
|
|
ina = 0;
|
|
|
|
} else {
|
|
|
|
inbuf = malloc(inlen, M_NETGRAPH_MPPC, M_NOWAIT);
|
|
|
|
if (inbuf == NULL) {
|
|
|
|
m_freem(m);
|
|
|
|
return (ENOMEM);
|
|
|
|
}
|
|
|
|
m_copydata(m, 0, inlen, (caddr_t)inbuf);
|
|
|
|
ina = 1;
|
2007-05-11 14:36:02 +00:00
|
|
|
}
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Allocate a buffer for decompressed data */
|
2009-01-18 21:09:34 +00:00
|
|
|
outbuf = malloc(MPPC_DECOMP_BUFSIZE + MPPC_DECOMP_SAFETY,
|
2007-05-11 14:36:02 +00:00
|
|
|
M_NETGRAPH_MPPC, M_NOWAIT);
|
2009-01-18 21:09:34 +00:00
|
|
|
if (outbuf == NULL) {
|
2007-05-11 14:36:02 +00:00
|
|
|
m_freem(m);
|
2009-01-18 21:09:34 +00:00
|
|
|
if (ina)
|
|
|
|
free(inbuf, M_NETGRAPH_MPPC);
|
2000-04-09 21:04:55 +00:00
|
|
|
return (ENOMEM);
|
|
|
|
}
|
2009-01-18 21:09:34 +00:00
|
|
|
outlen = MPPC_DECOMP_BUFSIZE;
|
2000-04-09 21:04:55 +00:00
|
|
|
|
|
|
|
/* Prepare to decompress */
|
2009-01-18 21:09:34 +00:00
|
|
|
source = inbuf;
|
|
|
|
sourceCnt = inlen;
|
|
|
|
dest = outbuf;
|
|
|
|
destCnt = outlen;
|
2000-04-09 21:04:55 +00:00
|
|
|
if ((header & MPPC_FLAG_RESTART) != 0)
|
|
|
|
flags |= MPPC_RESTART_HISTORY;
|
|
|
|
|
|
|
|
/* Decompress */
|
|
|
|
rtn = MPPC_Decompress(&source, &dest,
|
|
|
|
&sourceCnt, &destCnt, d->history, flags);
|
|
|
|
|
|
|
|
/* Check return value */
|
2001-12-10 08:09:49 +00:00
|
|
|
KASSERT(rtn != MPPC_INVALID, ("%s: invalid", __func__));
|
2000-04-09 21:04:55 +00:00
|
|
|
if ((rtn & MPPC_DEST_EXHAUSTED) != 0
|
|
|
|
|| (rtn & MPPC_DECOMP_OK) != MPPC_DECOMP_OK) {
|
|
|
|
log(LOG_ERR, "%s: decomp returned 0x%x",
|
2001-12-10 08:09:49 +00:00
|
|
|
__func__, rtn);
|
2009-01-18 21:09:34 +00:00
|
|
|
if (ina)
|
|
|
|
free(inbuf, M_NETGRAPH_MPPC);
|
|
|
|
free(outbuf, M_NETGRAPH_MPPC);
|
2000-04-09 21:04:55 +00:00
|
|
|
goto failed;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Replace compressed data with decompressed data */
|
2009-01-18 21:09:34 +00:00
|
|
|
if (ina)
|
|
|
|
free(inbuf, M_NETGRAPH_MPPC);
|
|
|
|
outlen -= destCnt;
|
2007-05-11 14:36:02 +00:00
|
|
|
|
2009-01-18 21:09:34 +00:00
|
|
|
m_copyback(m, 0, outlen, (caddr_t)outbuf);
|
|
|
|
if (m->m_pkthdr.len < outlen) {
|
2009-01-18 19:25:36 +00:00
|
|
|
m_freem(m);
|
|
|
|
m = NULL;
|
2009-01-18 21:09:34 +00:00
|
|
|
} else if (outlen < m->m_pkthdr.len)
|
|
|
|
m_adj(m, outlen - m->m_pkthdr.len);
|
|
|
|
free(outbuf, M_NETGRAPH_MPPC);
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Return result in an mbuf */
|
2007-05-11 14:36:02 +00:00
|
|
|
*datap = m;
|
|
|
|
return (*datap == NULL ? ENOBUFS : 0);
|
2000-04-09 21:04:55 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The peer has sent us a CCP ResetRequest, so reset our transmit state.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
ng_mppc_reset_req(node_p node)
|
|
|
|
{
|
2001-01-08 05:34:06 +00:00
|
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
2000-04-09 21:04:55 +00:00
|
|
|
struct ng_mppc_dir *const d = &priv->xmit;
|
|
|
|
|
|
|
|
#ifdef NETGRAPH_MPPC_COMPRESSION
|
|
|
|
if (d->history != NULL)
|
|
|
|
MPPC_InitCompressionHistory(d->history);
|
|
|
|
#endif
|
|
|
|
#ifdef NETGRAPH_MPPC_ENCRYPTION
|
|
|
|
if ((d->cfg.bits & MPPE_STATELESS) == 0)
|
|
|
|
rc4_init(&d->rc4, d->key, KEYLEN(d->cfg.bits));
|
|
|
|
#endif
|
|
|
|
d->flushed = 1;
|
|
|
|
}
|
|
|
|
|
2007-05-18 15:28:01 +00:00
|
|
|
#ifdef NETGRAPH_MPPC_ENCRYPTION
|
2000-04-09 21:04:55 +00:00
|
|
|
/*
|
|
|
|
* Generate a new encryption key
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
ng_mppc_getkey(const u_char *h, u_char *h2, int len)
|
|
|
|
{
|
2008-12-16 19:15:31 +00:00
|
|
|
static const u_char pad1[40] =
|
|
|
|
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
|
|
|
|
static const u_char pad2[40] =
|
|
|
|
{ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
|
|
|
|
0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
|
|
|
|
0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
|
|
|
|
0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2 };
|
2000-04-09 21:04:55 +00:00
|
|
|
u_char hash[20];
|
|
|
|
SHA1_CTX c;
|
|
|
|
|
|
|
|
SHA1Init(&c);
|
|
|
|
SHA1Update(&c, h, len);
|
2008-12-16 19:15:31 +00:00
|
|
|
SHA1Update(&c, pad1, sizeof(pad1));
|
2000-04-09 21:04:55 +00:00
|
|
|
SHA1Update(&c, h2, len);
|
2008-12-16 19:15:31 +00:00
|
|
|
SHA1Update(&c, pad2, sizeof(pad2));
|
2000-04-09 21:04:55 +00:00
|
|
|
SHA1Final(hash, &c);
|
|
|
|
bcopy(hash, h2, len);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Update the encryption key
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
ng_mppc_updatekey(u_int32_t bits,
|
|
|
|
u_char *key0, u_char *key, struct rc4_state *rc4)
|
|
|
|
{
|
|
|
|
const int keylen = KEYLEN(bits);
|
|
|
|
|
|
|
|
ng_mppc_getkey(key0, key, keylen);
|
|
|
|
rc4_init(rc4, key, keylen);
|
|
|
|
rc4_crypt(rc4, key, key, keylen);
|
2001-12-15 02:07:32 +00:00
|
|
|
if ((bits & MPPE_40) != 0)
|
|
|
|
bcopy(&ng_mppe_weakenkey, key, 3);
|
|
|
|
else if ((bits & MPPE_56) != 0)
|
|
|
|
bcopy(&ng_mppe_weakenkey, key, 1);
|
2000-04-09 21:04:55 +00:00
|
|
|
rc4_init(rc4, key, keylen);
|
|
|
|
}
|
2007-05-18 15:28:01 +00:00
|
|
|
#endif
|
2000-04-09 21:04:55 +00:00
|
|
|
|