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1645 lines
36 KiB
C
1645 lines
36 KiB
C
/* $FreeBSD$ */
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/* $KAME: ah_core.c,v 1.44 2001/03/12 11:24:39 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* 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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* RFC1826/2402 authentication header.
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*/
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/* TODO: have shared routines for hmac-* algorithms */
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#endif
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#include <netinet6/ipsec.h>
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#ifdef INET6
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#include <netinet6/ipsec6.h>
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#endif
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#include <netinet6/ah.h>
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#ifdef INET6
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#include <netinet6/ah6.h>
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#endif
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#ifdef IPSEC_ESP
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#include <netinet6/esp.h>
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#ifdef INET6
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#include <netinet6/esp6.h>
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#endif
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#endif
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#include <net/pfkeyv2.h>
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#include <netkey/keydb.h>
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#include <sys/md5.h>
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#include <crypto/sha1.h>
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#include <crypto/sha2/sha2.h>
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#include <net/net_osdep.h>
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#define HMACSIZE 16
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static int ah_sumsiz_1216 __P((struct secasvar *));
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static int ah_sumsiz_zero __P((struct secasvar *));
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static int ah_none_mature __P((struct secasvar *));
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static int ah_none_init __P((struct ah_algorithm_state *, struct secasvar *));
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static void ah_none_loop __P((struct ah_algorithm_state *, caddr_t, size_t));
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static void ah_none_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_keyed_md5_mature __P((struct secasvar *));
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static int ah_keyed_md5_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_keyed_md5_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_keyed_md5_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_keyed_sha1_mature __P((struct secasvar *));
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static int ah_keyed_sha1_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_keyed_sha1_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_keyed_sha1_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_hmac_md5_mature __P((struct secasvar *));
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static int ah_hmac_md5_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_hmac_md5_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_hmac_md5_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_hmac_sha1_mature __P((struct secasvar *));
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static int ah_hmac_sha1_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_hmac_sha1_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_hmac_sha1_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_hmac_sha2_256_mature __P((struct secasvar *));
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static int ah_hmac_sha2_256_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_hmac_sha2_256_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_hmac_sha2_256_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_hmac_sha2_384_mature __P((struct secasvar *));
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static int ah_hmac_sha2_384_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_hmac_sha2_384_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_hmac_sha2_384_result __P((struct ah_algorithm_state *, caddr_t));
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static int ah_hmac_sha2_512_mature __P((struct secasvar *));
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static int ah_hmac_sha2_512_init __P((struct ah_algorithm_state *,
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struct secasvar *));
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static void ah_hmac_sha2_512_loop __P((struct ah_algorithm_state *, caddr_t,
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size_t));
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static void ah_hmac_sha2_512_result __P((struct ah_algorithm_state *, caddr_t));
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static void ah_update_mbuf __P((struct mbuf *, int, int,
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const struct ah_algorithm *, struct ah_algorithm_state *));
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const struct ah_algorithm *
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ah_algorithm_lookup(idx)
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int idx;
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{
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/* checksum algorithms */
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static struct ah_algorithm ah_algorithms[] = {
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{ ah_sumsiz_1216, ah_hmac_md5_mature, 128, 128, "hmac-md5",
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ah_hmac_md5_init, ah_hmac_md5_loop,
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ah_hmac_md5_result, },
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{ ah_sumsiz_1216, ah_hmac_sha1_mature, 160, 160, "hmac-sha1",
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ah_hmac_sha1_init, ah_hmac_sha1_loop,
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ah_hmac_sha1_result, },
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{ ah_sumsiz_1216, ah_keyed_md5_mature, 128, 128, "keyed-md5",
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ah_keyed_md5_init, ah_keyed_md5_loop,
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ah_keyed_md5_result, },
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{ ah_sumsiz_1216, ah_keyed_sha1_mature, 160, 160, "keyed-sha1",
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ah_keyed_sha1_init, ah_keyed_sha1_loop,
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ah_keyed_sha1_result, },
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{ ah_sumsiz_zero, ah_none_mature, 0, 2048, "none",
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ah_none_init, ah_none_loop, ah_none_result, },
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{ ah_sumsiz_1216, ah_hmac_sha2_256_mature, 256, 256,
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"hmac-sha2-256",
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ah_hmac_sha2_256_init, ah_hmac_sha2_256_loop,
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ah_hmac_sha2_256_result, },
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{ ah_sumsiz_1216, ah_hmac_sha2_384_mature, 384, 384,
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"hmac-sha2-384",
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ah_hmac_sha2_384_init, ah_hmac_sha2_384_loop,
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ah_hmac_sha2_384_result, },
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{ ah_sumsiz_1216, ah_hmac_sha2_512_mature, 512, 512,
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"hmac-sha2-512",
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ah_hmac_sha2_512_init, ah_hmac_sha2_512_loop,
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ah_hmac_sha2_512_result, },
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};
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switch (idx) {
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case SADB_AALG_MD5HMAC:
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return &ah_algorithms[0];
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case SADB_AALG_SHA1HMAC:
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return &ah_algorithms[1];
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case SADB_X_AALG_MD5:
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return &ah_algorithms[2];
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case SADB_X_AALG_SHA:
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return &ah_algorithms[3];
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case SADB_X_AALG_NULL:
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return &ah_algorithms[4];
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case SADB_X_AALG_SHA2_256:
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return &ah_algorithms[5];
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case SADB_X_AALG_SHA2_384:
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return &ah_algorithms[6];
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case SADB_X_AALG_SHA2_512:
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return &ah_algorithms[7];
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default:
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return NULL;
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}
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}
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static int
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ah_sumsiz_1216(sav)
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struct secasvar *sav;
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{
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if (!sav)
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return -1;
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if (sav->flags & SADB_X_EXT_OLD)
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return 16;
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else
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return 12;
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}
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static int
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ah_sumsiz_zero(sav)
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struct secasvar *sav;
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{
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if (!sav)
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return -1;
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return 0;
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}
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static int
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ah_none_mature(sav)
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struct secasvar *sav;
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{
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if (sav->sah->saidx.proto == IPPROTO_AH) {
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ipseclog((LOG_ERR,
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"ah_none_mature: protocol and algorithm mismatch.\n"));
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return 1;
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}
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return 0;
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}
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static int
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ah_none_init(state, sav)
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struct ah_algorithm_state *state;
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struct secasvar *sav;
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{
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state->foo = NULL;
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return 0;
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}
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static void
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ah_none_loop(state, addr, len)
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struct ah_algorithm_state *state;
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caddr_t addr;
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size_t len;
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{
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}
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static void
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ah_none_result(state, addr)
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struct ah_algorithm_state *state;
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caddr_t addr;
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{
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}
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static int
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ah_keyed_md5_mature(sav)
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struct secasvar *sav;
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{
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/* anything is okay */
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return 0;
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}
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static int
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ah_keyed_md5_init(state, sav)
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struct ah_algorithm_state *state;
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struct secasvar *sav;
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{
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size_t padlen;
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size_t keybitlen;
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u_int8_t buf[32];
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if (!state)
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panic("ah_keyed_md5_init: what?");
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state->sav = sav;
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state->foo = (void *)malloc(sizeof(MD5_CTX), M_TEMP, M_NOWAIT);
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if (state->foo == NULL)
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return ENOBUFS;
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MD5Init((MD5_CTX *)state->foo);
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if (state->sav) {
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MD5Update((MD5_CTX *)state->foo,
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(u_int8_t *)_KEYBUF(state->sav->key_auth),
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(u_int)_KEYLEN(state->sav->key_auth));
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/*
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* Pad after the key.
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* We cannot simply use md5_pad() since the function
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* won't update the total length.
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*/
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if (_KEYLEN(state->sav->key_auth) < 56)
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padlen = 64 - 8 - _KEYLEN(state->sav->key_auth);
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else
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padlen = 64 + 64 - 8 - _KEYLEN(state->sav->key_auth);
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keybitlen = _KEYLEN(state->sav->key_auth);
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keybitlen *= 8;
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buf[0] = 0x80;
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MD5Update((MD5_CTX *)state->foo, &buf[0], 1);
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padlen--;
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bzero(buf, sizeof(buf));
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while (sizeof(buf) < padlen) {
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MD5Update((MD5_CTX *)state->foo, &buf[0], sizeof(buf));
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padlen -= sizeof(buf);
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}
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if (padlen) {
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MD5Update((MD5_CTX *)state->foo, &buf[0], padlen);
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}
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buf[0] = (keybitlen >> 0) & 0xff;
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buf[1] = (keybitlen >> 8) & 0xff;
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buf[2] = (keybitlen >> 16) & 0xff;
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buf[3] = (keybitlen >> 24) & 0xff;
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MD5Update((MD5_CTX *)state->foo, buf, 8);
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}
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return 0;
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}
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static void
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ah_keyed_md5_loop(state, addr, len)
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struct ah_algorithm_state *state;
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caddr_t addr;
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size_t len;
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{
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if (!state)
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panic("ah_keyed_md5_loop: what?");
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MD5Update((MD5_CTX *)state->foo, addr, len);
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}
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static void
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ah_keyed_md5_result(state, addr)
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struct ah_algorithm_state *state;
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caddr_t addr;
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{
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u_char digest[16];
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if (!state)
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panic("ah_keyed_md5_result: what?");
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if (state->sav) {
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MD5Update((MD5_CTX *)state->foo,
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(u_int8_t *)_KEYBUF(state->sav->key_auth),
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(u_int)_KEYLEN(state->sav->key_auth));
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}
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MD5Final(&digest[0], (MD5_CTX *)state->foo);
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free(state->foo, M_TEMP);
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bcopy(&digest[0], (void *)addr, sizeof(digest));
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}
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static int
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ah_keyed_sha1_mature(sav)
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struct secasvar *sav;
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{
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const struct ah_algorithm *algo;
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if (!sav->key_auth) {
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ipseclog((LOG_ERR, "ah_keyed_sha1_mature: no key is given.\n"));
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return 1;
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}
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algo = ah_algorithm_lookup(sav->alg_auth);
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if (!algo) {
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ipseclog((LOG_ERR, "ah_keyed_sha1_mature: unsupported algorithm.\n"));
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return 1;
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}
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if (sav->key_auth->sadb_key_bits < algo->keymin
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|| algo->keymax < sav->key_auth->sadb_key_bits) {
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ipseclog((LOG_ERR,
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"ah_keyed_sha1_mature: invalid key length %d.\n",
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sav->key_auth->sadb_key_bits));
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return 1;
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}
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return 0;
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}
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static int
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ah_keyed_sha1_init(state, sav)
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struct ah_algorithm_state *state;
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struct secasvar *sav;
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{
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SHA1_CTX *ctxt;
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size_t padlen;
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size_t keybitlen;
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u_int8_t buf[32];
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if (!state)
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panic("ah_keyed_sha1_init: what?");
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state->sav = sav;
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state->foo = (void *)malloc(sizeof(SHA1_CTX), M_TEMP, M_NOWAIT);
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if (!state->foo)
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return ENOBUFS;
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ctxt = (SHA1_CTX *)state->foo;
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SHA1Init(ctxt);
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if (state->sav) {
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SHA1Update(ctxt, (u_int8_t *)_KEYBUF(state->sav->key_auth),
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(u_int)_KEYLEN(state->sav->key_auth));
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/*
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* Pad after the key.
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*/
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if (_KEYLEN(state->sav->key_auth) < 56)
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padlen = 64 - 8 - _KEYLEN(state->sav->key_auth);
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else
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padlen = 64 + 64 - 8 - _KEYLEN(state->sav->key_auth);
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keybitlen = _KEYLEN(state->sav->key_auth);
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keybitlen *= 8;
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buf[0] = 0x80;
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SHA1Update(ctxt, &buf[0], 1);
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padlen--;
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bzero(buf, sizeof(buf));
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while (sizeof(buf) < padlen) {
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SHA1Update(ctxt, &buf[0], sizeof(buf));
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padlen -= sizeof(buf);
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}
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if (padlen) {
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SHA1Update(ctxt, &buf[0], padlen);
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}
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buf[0] = (keybitlen >> 0) & 0xff;
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buf[1] = (keybitlen >> 8) & 0xff;
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buf[2] = (keybitlen >> 16) & 0xff;
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buf[3] = (keybitlen >> 24) & 0xff;
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SHA1Update(ctxt, buf, 8);
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}
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return 0;
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}
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static void
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ah_keyed_sha1_loop(state, addr, len)
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struct ah_algorithm_state *state;
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caddr_t addr;
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size_t len;
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{
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SHA1_CTX *ctxt;
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if (!state || !state->foo)
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panic("ah_keyed_sha1_loop: what?");
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ctxt = (SHA1_CTX *)state->foo;
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SHA1Update(ctxt, (caddr_t)addr, (size_t)len);
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}
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static void
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ah_keyed_sha1_result(state, addr)
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struct ah_algorithm_state *state;
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caddr_t addr;
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{
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u_char digest[SHA1_RESULTLEN]; /* SHA-1 generates 160 bits */
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SHA1_CTX *ctxt;
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if (!state || !state->foo)
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panic("ah_keyed_sha1_result: what?");
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ctxt = (SHA1_CTX *)state->foo;
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if (state->sav) {
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SHA1Update(ctxt, (u_int8_t *)_KEYBUF(state->sav->key_auth),
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(u_int)_KEYLEN(state->sav->key_auth));
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}
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SHA1Final((caddr_t)&digest[0], ctxt);
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bcopy(&digest[0], (void *)addr, HMACSIZE);
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|
|
free(state->foo, M_TEMP);
|
|
}
|
|
|
|
static int
|
|
ah_hmac_md5_mature(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
const struct ah_algorithm *algo;
|
|
|
|
if (!sav->key_auth) {
|
|
ipseclog((LOG_ERR, "ah_hmac_md5_mature: no key is given.\n"));
|
|
return 1;
|
|
}
|
|
|
|
algo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!algo) {
|
|
ipseclog((LOG_ERR, "ah_hmac_md5_mature: unsupported algorithm.\n"));
|
|
return 1;
|
|
}
|
|
|
|
if (sav->key_auth->sadb_key_bits < algo->keymin
|
|
|| algo->keymax < sav->key_auth->sadb_key_bits) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_md5_mature: invalid key length %d.\n",
|
|
sav->key_auth->sadb_key_bits));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ah_hmac_md5_init(state, sav)
|
|
struct ah_algorithm_state *state;
|
|
struct secasvar *sav;
|
|
{
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
u_char tk[16];
|
|
u_char *key;
|
|
size_t keylen;
|
|
size_t i;
|
|
MD5_CTX *ctxt;
|
|
|
|
if (!state)
|
|
panic("ah_hmac_md5_init: what?");
|
|
|
|
state->sav = sav;
|
|
state->foo = (void *)malloc(64 + 64 + sizeof(MD5_CTX), M_TEMP, M_NOWAIT);
|
|
if (!state->foo)
|
|
return ENOBUFS;
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (MD5_CTX *)(opad + 64);
|
|
|
|
/* compress the key if necessery */
|
|
if (64 < _KEYLEN(state->sav->key_auth)) {
|
|
MD5Init(ctxt);
|
|
MD5Update(ctxt, _KEYBUF(state->sav->key_auth),
|
|
_KEYLEN(state->sav->key_auth));
|
|
MD5Final(&tk[0], ctxt);
|
|
key = &tk[0];
|
|
keylen = 16;
|
|
} else {
|
|
key = _KEYBUF(state->sav->key_auth);
|
|
keylen = _KEYLEN(state->sav->key_auth);
|
|
}
|
|
|
|
bzero(ipad, 64);
|
|
bzero(opad, 64);
|
|
bcopy(key, ipad, keylen);
|
|
bcopy(key, opad, keylen);
|
|
for (i = 0; i < 64; i++) {
|
|
ipad[i] ^= 0x36;
|
|
opad[i] ^= 0x5c;
|
|
}
|
|
|
|
MD5Init(ctxt);
|
|
MD5Update(ctxt, ipad, 64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ah_hmac_md5_loop(state, addr, len)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
size_t len;
|
|
{
|
|
MD5_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_md5_loop: what?");
|
|
ctxt = (MD5_CTX *)(((caddr_t)state->foo) + 128);
|
|
MD5Update(ctxt, addr, len);
|
|
}
|
|
|
|
static void
|
|
ah_hmac_md5_result(state, addr)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
{
|
|
u_char digest[16];
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
MD5_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_md5_result: what?");
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (MD5_CTX *)(opad + 64);
|
|
|
|
MD5Final(&digest[0], ctxt);
|
|
|
|
MD5Init(ctxt);
|
|
MD5Update(ctxt, opad, 64);
|
|
MD5Update(ctxt, &digest[0], sizeof(digest));
|
|
MD5Final(&digest[0], ctxt);
|
|
|
|
bcopy(&digest[0], (void *)addr, HMACSIZE);
|
|
|
|
free(state->foo, M_TEMP);
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha1_mature(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
const struct ah_algorithm *algo;
|
|
|
|
if (!sav->key_auth) {
|
|
ipseclog((LOG_ERR, "ah_hmac_sha1_mature: no key is given.\n"));
|
|
return 1;
|
|
}
|
|
|
|
algo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!algo) {
|
|
ipseclog((LOG_ERR, "ah_hmac_sha1_mature: unsupported algorithm.\n"));
|
|
return 1;
|
|
}
|
|
|
|
if (sav->key_auth->sadb_key_bits < algo->keymin
|
|
|| algo->keymax < sav->key_auth->sadb_key_bits) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha1_mature: invalid key length %d.\n",
|
|
sav->key_auth->sadb_key_bits));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha1_init(state, sav)
|
|
struct ah_algorithm_state *state;
|
|
struct secasvar *sav;
|
|
{
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA1_CTX *ctxt;
|
|
u_char tk[SHA1_RESULTLEN]; /* SHA-1 generates 160 bits */
|
|
u_char *key;
|
|
size_t keylen;
|
|
size_t i;
|
|
|
|
if (!state)
|
|
panic("ah_hmac_sha1_init: what?");
|
|
|
|
state->sav = sav;
|
|
state->foo = (void *)malloc(64 + 64 + sizeof(SHA1_CTX),
|
|
M_TEMP, M_NOWAIT);
|
|
if (!state->foo)
|
|
return ENOBUFS;
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA1_CTX *)(opad + 64);
|
|
|
|
/* compress the key if necessery */
|
|
if (64 < _KEYLEN(state->sav->key_auth)) {
|
|
SHA1Init(ctxt);
|
|
SHA1Update(ctxt, _KEYBUF(state->sav->key_auth),
|
|
_KEYLEN(state->sav->key_auth));
|
|
SHA1Final(&tk[0], ctxt);
|
|
key = &tk[0];
|
|
keylen = SHA1_RESULTLEN;
|
|
} else {
|
|
key = _KEYBUF(state->sav->key_auth);
|
|
keylen = _KEYLEN(state->sav->key_auth);
|
|
}
|
|
|
|
bzero(ipad, 64);
|
|
bzero(opad, 64);
|
|
bcopy(key, ipad, keylen);
|
|
bcopy(key, opad, keylen);
|
|
for (i = 0; i < 64; i++) {
|
|
ipad[i] ^= 0x36;
|
|
opad[i] ^= 0x5c;
|
|
}
|
|
|
|
SHA1Init(ctxt);
|
|
SHA1Update(ctxt, ipad, 64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha1_loop(state, addr, len)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
size_t len;
|
|
{
|
|
SHA1_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha1_loop: what?");
|
|
|
|
ctxt = (SHA1_CTX *)(((u_char *)state->foo) + 128);
|
|
SHA1Update(ctxt, (caddr_t)addr, (size_t)len);
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha1_result(state, addr)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
{
|
|
u_char digest[SHA1_RESULTLEN]; /* SHA-1 generates 160 bits */
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA1_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha1_result: what?");
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA1_CTX *)(opad + 64);
|
|
|
|
SHA1Final((caddr_t)&digest[0], ctxt);
|
|
|
|
SHA1Init(ctxt);
|
|
SHA1Update(ctxt, opad, 64);
|
|
SHA1Update(ctxt, (caddr_t)&digest[0], sizeof(digest));
|
|
SHA1Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bcopy(&digest[0], (void *)addr, HMACSIZE);
|
|
|
|
free(state->foo, M_TEMP);
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha2_256_mature(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
const struct ah_algorithm *algo;
|
|
|
|
if (!sav->key_auth) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_256_mature: no key is given.\n"));
|
|
return 1;
|
|
}
|
|
|
|
algo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!algo) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_256_mature: unsupported algorithm.\n"));
|
|
return 1;
|
|
}
|
|
|
|
if (sav->key_auth->sadb_key_bits < algo->keymin ||
|
|
algo->keymax < sav->key_auth->sadb_key_bits) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_256_mature: invalid key length %d.\n",
|
|
sav->key_auth->sadb_key_bits));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha2_256_init(state, sav)
|
|
struct ah_algorithm_state *state;
|
|
struct secasvar *sav;
|
|
{
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA256_CTX *ctxt;
|
|
u_char tk[SHA256_DIGEST_LENGTH];
|
|
u_char *key;
|
|
size_t keylen;
|
|
size_t i;
|
|
|
|
if (!state)
|
|
panic("ah_hmac_sha2_256_init: what?");
|
|
|
|
state->sav = sav;
|
|
state->foo = (void *)malloc(64 + 64 + sizeof(SHA256_CTX),
|
|
M_TEMP, M_NOWAIT);
|
|
if (!state->foo)
|
|
return ENOBUFS;
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA256_CTX *)(opad + 64);
|
|
|
|
/* compress the key if necessery */
|
|
if (64 < _KEYLEN(state->sav->key_auth)) {
|
|
bzero(tk, sizeof(tk));
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA256_Init(ctxt);
|
|
SHA256_Update(ctxt, _KEYBUF(state->sav->key_auth),
|
|
_KEYLEN(state->sav->key_auth));
|
|
SHA256_Final(&tk[0], ctxt);
|
|
key = &tk[0];
|
|
keylen = sizeof(tk) < 64 ? sizeof(tk) : 64;
|
|
} else {
|
|
key = _KEYBUF(state->sav->key_auth);
|
|
keylen = _KEYLEN(state->sav->key_auth);
|
|
}
|
|
|
|
bzero(ipad, 64);
|
|
bzero(opad, 64);
|
|
bcopy(key, ipad, keylen);
|
|
bcopy(key, opad, keylen);
|
|
for (i = 0; i < 64; i++) {
|
|
ipad[i] ^= 0x36;
|
|
opad[i] ^= 0x5c;
|
|
}
|
|
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA256_Init(ctxt);
|
|
SHA256_Update(ctxt, ipad, 64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha2_256_loop(state, addr, len)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
size_t len;
|
|
{
|
|
SHA256_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha2_256_loop: what?");
|
|
|
|
ctxt = (SHA256_CTX *)(((u_char *)state->foo) + 128);
|
|
SHA256_Update(ctxt, (caddr_t)addr, (size_t)len);
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha2_256_result(state, addr)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
{
|
|
u_char digest[SHA256_DIGEST_LENGTH];
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA256_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha2_256_result: what?");
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA256_CTX *)(opad + 64);
|
|
|
|
SHA256_Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA256_Init(ctxt);
|
|
SHA256_Update(ctxt, opad, 64);
|
|
SHA256_Update(ctxt, (caddr_t)&digest[0], sizeof(digest));
|
|
SHA256_Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bcopy(&digest[0], (void *)addr, HMACSIZE);
|
|
|
|
free(state->foo, M_TEMP);
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha2_384_mature(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
const struct ah_algorithm *algo;
|
|
|
|
if (!sav->key_auth) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_384_mature: no key is given.\n"));
|
|
return 1;
|
|
}
|
|
|
|
algo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!algo) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_384_mature: unsupported algorithm.\n"));
|
|
return 1;
|
|
}
|
|
|
|
if (sav->key_auth->sadb_key_bits < algo->keymin ||
|
|
algo->keymax < sav->key_auth->sadb_key_bits) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_384_mature: invalid key length %d.\n",
|
|
sav->key_auth->sadb_key_bits));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha2_384_init(state, sav)
|
|
struct ah_algorithm_state *state;
|
|
struct secasvar *sav;
|
|
{
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA384_CTX *ctxt;
|
|
u_char tk[SHA384_DIGEST_LENGTH];
|
|
u_char *key;
|
|
size_t keylen;
|
|
size_t i;
|
|
|
|
if (!state)
|
|
panic("ah_hmac_sha2_384_init: what?");
|
|
|
|
state->sav = sav;
|
|
state->foo = (void *)malloc(64 + 64 + sizeof(SHA384_CTX),
|
|
M_TEMP, M_NOWAIT);
|
|
if (!state->foo)
|
|
return ENOBUFS;
|
|
bzero(state->foo, 64 + 64 + sizeof(SHA384_CTX));
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA384_CTX *)(opad + 64);
|
|
|
|
/* compress the key if necessery */
|
|
if (64 < _KEYLEN(state->sav->key_auth)) {
|
|
bzero(tk, sizeof(tk));
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA384_Init(ctxt);
|
|
SHA384_Update(ctxt, _KEYBUF(state->sav->key_auth),
|
|
_KEYLEN(state->sav->key_auth));
|
|
SHA384_Final(&tk[0], ctxt);
|
|
key = &tk[0];
|
|
keylen = sizeof(tk) < 64 ? sizeof(tk) : 64;
|
|
} else {
|
|
key = _KEYBUF(state->sav->key_auth);
|
|
keylen = _KEYLEN(state->sav->key_auth);
|
|
}
|
|
|
|
bzero(ipad, 64);
|
|
bzero(opad, 64);
|
|
bcopy(key, ipad, keylen);
|
|
bcopy(key, opad, keylen);
|
|
for (i = 0; i < 64; i++) {
|
|
ipad[i] ^= 0x36;
|
|
opad[i] ^= 0x5c;
|
|
}
|
|
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA384_Init(ctxt);
|
|
SHA384_Update(ctxt, ipad, 64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha2_384_loop(state, addr, len)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
size_t len;
|
|
{
|
|
SHA384_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha2_384_loop: what?");
|
|
|
|
ctxt = (SHA384_CTX *)(((u_char *)state->foo) + 128);
|
|
SHA384_Update(ctxt, (caddr_t)addr, (size_t)len);
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha2_384_result(state, addr)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
{
|
|
u_char digest[SHA384_DIGEST_LENGTH];
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA384_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha2_384_result: what?");
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA384_CTX *)(opad + 64);
|
|
|
|
SHA384_Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA384_Init(ctxt);
|
|
SHA384_Update(ctxt, opad, 64);
|
|
SHA384_Update(ctxt, (caddr_t)&digest[0], sizeof(digest));
|
|
SHA384_Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bcopy(&digest[0], (void *)addr, HMACSIZE);
|
|
|
|
free(state->foo, M_TEMP);
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha2_512_mature(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
const struct ah_algorithm *algo;
|
|
|
|
if (!sav->key_auth) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_512_mature: no key is given.\n"));
|
|
return 1;
|
|
}
|
|
|
|
algo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!algo) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_512_mature: unsupported algorithm.\n"));
|
|
return 1;
|
|
}
|
|
|
|
if (sav->key_auth->sadb_key_bits < algo->keymin ||
|
|
algo->keymax < sav->key_auth->sadb_key_bits) {
|
|
ipseclog((LOG_ERR,
|
|
"ah_hmac_sha2_512_mature: invalid key length %d.\n",
|
|
sav->key_auth->sadb_key_bits));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ah_hmac_sha2_512_init(state, sav)
|
|
struct ah_algorithm_state *state;
|
|
struct secasvar *sav;
|
|
{
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA512_CTX *ctxt;
|
|
u_char tk[SHA512_DIGEST_LENGTH];
|
|
u_char *key;
|
|
size_t keylen;
|
|
size_t i;
|
|
|
|
if (!state)
|
|
panic("ah_hmac_sha2_512_init: what?");
|
|
|
|
state->sav = sav;
|
|
state->foo = (void *)malloc(64 + 64 + sizeof(SHA512_CTX),
|
|
M_TEMP, M_NOWAIT);
|
|
if (!state->foo)
|
|
return ENOBUFS;
|
|
bzero(state->foo, 64 + 64 + sizeof(SHA512_CTX));
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA512_CTX *)(opad + 64);
|
|
|
|
/* compress the key if necessery */
|
|
if (64 < _KEYLEN(state->sav->key_auth)) {
|
|
bzero(tk, sizeof(tk));
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA512_Init(ctxt);
|
|
SHA512_Update(ctxt, _KEYBUF(state->sav->key_auth),
|
|
_KEYLEN(state->sav->key_auth));
|
|
SHA512_Final(&tk[0], ctxt);
|
|
key = &tk[0];
|
|
keylen = sizeof(tk) < 64 ? sizeof(tk) : 64;
|
|
} else {
|
|
key = _KEYBUF(state->sav->key_auth);
|
|
keylen = _KEYLEN(state->sav->key_auth);
|
|
}
|
|
|
|
bzero(ipad, 64);
|
|
bzero(opad, 64);
|
|
bcopy(key, ipad, keylen);
|
|
bcopy(key, opad, keylen);
|
|
for (i = 0; i < 64; i++) {
|
|
ipad[i] ^= 0x36;
|
|
opad[i] ^= 0x5c;
|
|
}
|
|
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA512_Init(ctxt);
|
|
SHA512_Update(ctxt, ipad, 64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha2_512_loop(state, addr, len)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
size_t len;
|
|
{
|
|
SHA512_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha2_512_loop: what?");
|
|
|
|
ctxt = (SHA512_CTX *)(((u_char *)state->foo) + 128);
|
|
SHA512_Update(ctxt, (caddr_t)addr, (size_t)len);
|
|
}
|
|
|
|
static void
|
|
ah_hmac_sha2_512_result(state, addr)
|
|
struct ah_algorithm_state *state;
|
|
caddr_t addr;
|
|
{
|
|
u_char digest[SHA512_DIGEST_LENGTH];
|
|
u_char *ipad;
|
|
u_char *opad;
|
|
SHA512_CTX *ctxt;
|
|
|
|
if (!state || !state->foo)
|
|
panic("ah_hmac_sha2_512_result: what?");
|
|
|
|
ipad = (u_char *)state->foo;
|
|
opad = (u_char *)(ipad + 64);
|
|
ctxt = (SHA512_CTX *)(opad + 64);
|
|
|
|
SHA512_Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bzero(ctxt, sizeof(*ctxt));
|
|
SHA512_Init(ctxt);
|
|
SHA512_Update(ctxt, opad, 64);
|
|
SHA512_Update(ctxt, (caddr_t)&digest[0], sizeof(digest));
|
|
SHA512_Final((caddr_t)&digest[0], ctxt);
|
|
|
|
bcopy(&digest[0], (void *)addr, HMACSIZE);
|
|
|
|
free(state->foo, M_TEMP);
|
|
}
|
|
|
|
/*------------------------------------------------------------*/
|
|
|
|
/*
|
|
* go generate the checksum.
|
|
*/
|
|
static void
|
|
ah_update_mbuf(m, off, len, algo, algos)
|
|
struct mbuf *m;
|
|
int off;
|
|
int len;
|
|
const struct ah_algorithm *algo;
|
|
struct ah_algorithm_state *algos;
|
|
{
|
|
struct mbuf *n;
|
|
int tlen;
|
|
|
|
/* easy case first */
|
|
if (off + len <= m->m_len) {
|
|
(algo->update)(algos, mtod(m, caddr_t) + off, len);
|
|
return;
|
|
}
|
|
|
|
for (n = m; n; n = n->m_next) {
|
|
if (off < n->m_len)
|
|
break;
|
|
|
|
off -= n->m_len;
|
|
}
|
|
|
|
if (!n)
|
|
panic("ah_update_mbuf: wrong offset specified");
|
|
|
|
for (/* nothing */; n && len > 0; n = n->m_next) {
|
|
if (n->m_len == 0)
|
|
continue;
|
|
if (n->m_len - off < len)
|
|
tlen = n->m_len - off;
|
|
else
|
|
tlen = len;
|
|
|
|
(algo->update)(algos, mtod(n, caddr_t) + off, tlen);
|
|
|
|
len -= tlen;
|
|
off = 0;
|
|
}
|
|
}
|
|
|
|
#ifdef INET
|
|
/*
|
|
* Go generate the checksum. This function won't modify the mbuf chain
|
|
* except AH itself.
|
|
*
|
|
* NOTE: the function does not free mbuf on failure.
|
|
* Don't use m_copy(), it will try to share cluster mbuf by using refcnt.
|
|
*/
|
|
int
|
|
ah4_calccksum(m, ahdat, len, algo, sav)
|
|
struct mbuf *m;
|
|
caddr_t ahdat;
|
|
size_t len;
|
|
const struct ah_algorithm *algo;
|
|
struct secasvar *sav;
|
|
{
|
|
int off;
|
|
int hdrtype;
|
|
size_t advancewidth;
|
|
struct ah_algorithm_state algos;
|
|
u_char sumbuf[AH_MAXSUMSIZE];
|
|
int error = 0;
|
|
int ahseen;
|
|
struct mbuf *n = NULL;
|
|
|
|
if ((m->m_flags & M_PKTHDR) == 0)
|
|
return EINVAL;
|
|
|
|
ahseen = 0;
|
|
hdrtype = -1; /* dummy, it is called IPPROTO_IP */
|
|
|
|
off = 0;
|
|
|
|
error = (algo->init)(&algos, sav);
|
|
if (error)
|
|
return error;
|
|
|
|
advancewidth = 0; /* safety */
|
|
|
|
again:
|
|
/* gory. */
|
|
switch (hdrtype) {
|
|
case -1: /* first one only */
|
|
{
|
|
/*
|
|
* copy ip hdr, modify to fit the AH checksum rule,
|
|
* then take a checksum.
|
|
*/
|
|
struct ip iphdr;
|
|
size_t hlen;
|
|
|
|
m_copydata(m, off, sizeof(iphdr), (caddr_t)&iphdr);
|
|
#ifdef _IP_VHL
|
|
hlen = IP_VHL_HL(iphdr.ip_vhl) << 2;
|
|
#else
|
|
hlen = iphdr.ip_hl << 2;
|
|
#endif
|
|
iphdr.ip_ttl = 0;
|
|
iphdr.ip_sum = htons(0);
|
|
if (ip4_ah_cleartos)
|
|
iphdr.ip_tos = 0;
|
|
iphdr.ip_off = htons(ntohs(iphdr.ip_off) & ip4_ah_offsetmask);
|
|
(algo->update)(&algos, (caddr_t)&iphdr, sizeof(struct ip));
|
|
|
|
if (hlen != sizeof(struct ip)) {
|
|
u_char *p;
|
|
int i, l, skip;
|
|
|
|
if (hlen > MCLBYTES) {
|
|
error = EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (n && hlen > MLEN) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (n == NULL) {
|
|
error = ENOBUFS;
|
|
goto fail;
|
|
}
|
|
m_copydata(m, off, hlen, mtod(n, caddr_t));
|
|
|
|
/*
|
|
* IP options processing.
|
|
* See RFC2402 appendix A.
|
|
*/
|
|
p = mtod(n, u_char *);
|
|
i = sizeof(struct ip);
|
|
while (i < hlen) {
|
|
if (i + IPOPT_OPTVAL >= hlen) {
|
|
ipseclog((LOG_ERR, "ah4_calccksum: "
|
|
"invalid IP option\n"));
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
if (p[i + IPOPT_OPTVAL] == IPOPT_EOL ||
|
|
p[i + IPOPT_OPTVAL] == IPOPT_NOP ||
|
|
i + IPOPT_OLEN < hlen)
|
|
;
|
|
else {
|
|
ipseclog((LOG_ERR,
|
|
"ah4_calccksum: invalid IP option "
|
|
"(type=%02x)\n",
|
|
p[i + IPOPT_OPTVAL]));
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
skip = 1;
|
|
switch (p[i + IPOPT_OPTVAL]) {
|
|
case IPOPT_EOL:
|
|
case IPOPT_NOP:
|
|
l = 1;
|
|
skip = 0;
|
|
break;
|
|
case IPOPT_SECURITY: /* 0x82 */
|
|
case 0x85: /* Extended security */
|
|
case 0x86: /* Commercial security */
|
|
case 0x94: /* Router alert */
|
|
case 0x95: /* RFC1770 */
|
|
l = p[i + IPOPT_OLEN];
|
|
if (l < 2)
|
|
goto invalopt;
|
|
skip = 0;
|
|
break;
|
|
default:
|
|
l = p[i + IPOPT_OLEN];
|
|
if (l < 2)
|
|
goto invalopt;
|
|
skip = 1;
|
|
break;
|
|
}
|
|
if (l < 1 || hlen - i < l) {
|
|
invalopt:
|
|
ipseclog((LOG_ERR,
|
|
"ah4_calccksum: invalid IP option "
|
|
"(type=%02x len=%02x)\n",
|
|
p[i + IPOPT_OPTVAL],
|
|
p[i + IPOPT_OLEN]));
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
if (skip)
|
|
bzero(p + i, l);
|
|
if (p[i + IPOPT_OPTVAL] == IPOPT_EOL)
|
|
break;
|
|
i += l;
|
|
}
|
|
p = mtod(n, u_char *) + sizeof(struct ip);
|
|
(algo->update)(&algos, p, hlen - sizeof(struct ip));
|
|
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
|
|
hdrtype = (iphdr.ip_p) & 0xff;
|
|
advancewidth = hlen;
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_AH:
|
|
{
|
|
struct ah ah;
|
|
int siz;
|
|
int hdrsiz;
|
|
int totlen;
|
|
|
|
m_copydata(m, off, sizeof(ah), (caddr_t)&ah);
|
|
hdrsiz = (sav->flags & SADB_X_EXT_OLD)
|
|
? sizeof(struct ah)
|
|
: sizeof(struct newah);
|
|
siz = (*algo->sumsiz)(sav);
|
|
totlen = (ah.ah_len + 2) << 2;
|
|
|
|
/*
|
|
* special treatment is necessary for the first one, not others
|
|
*/
|
|
if (!ahseen) {
|
|
if (totlen > m->m_pkthdr.len - off ||
|
|
totlen > MCLBYTES) {
|
|
error = EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (n && totlen > MLEN) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (n == NULL) {
|
|
error = ENOBUFS;
|
|
goto fail;
|
|
}
|
|
m_copydata(m, off, totlen, mtod(n, caddr_t));
|
|
n->m_len = totlen;
|
|
bzero(mtod(n, caddr_t) + hdrsiz, siz);
|
|
(algo->update)(&algos, mtod(n, caddr_t), n->m_len);
|
|
m_free(n);
|
|
n = NULL;
|
|
} else
|
|
ah_update_mbuf(m, off, totlen, algo, &algos);
|
|
ahseen++;
|
|
|
|
hdrtype = ah.ah_nxt;
|
|
advancewidth = totlen;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ah_update_mbuf(m, off, m->m_pkthdr.len - off, algo, &algos);
|
|
advancewidth = m->m_pkthdr.len - off;
|
|
break;
|
|
}
|
|
|
|
off += advancewidth;
|
|
if (off < m->m_pkthdr.len)
|
|
goto again;
|
|
|
|
if (len < (*algo->sumsiz)(sav)) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
(algo->result)(&algos, &sumbuf[0]);
|
|
bcopy(&sumbuf[0], ahdat, (*algo->sumsiz)(sav));
|
|
|
|
if (n)
|
|
m_free(n);
|
|
return error;
|
|
|
|
fail:
|
|
if (n)
|
|
m_free(n);
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* Go generate the checksum. This function won't modify the mbuf chain
|
|
* except AH itself.
|
|
*
|
|
* NOTE: the function does not free mbuf on failure.
|
|
* Don't use m_copy(), it will try to share cluster mbuf by using refcnt.
|
|
*/
|
|
int
|
|
ah6_calccksum(m, ahdat, len, algo, sav)
|
|
struct mbuf *m;
|
|
caddr_t ahdat;
|
|
size_t len;
|
|
const struct ah_algorithm *algo;
|
|
struct secasvar *sav;
|
|
{
|
|
int newoff, off;
|
|
int proto, nxt;
|
|
struct mbuf *n = NULL;
|
|
int error;
|
|
int ahseen;
|
|
struct ah_algorithm_state algos;
|
|
u_char sumbuf[AH_MAXSUMSIZE];
|
|
|
|
if ((m->m_flags & M_PKTHDR) == 0)
|
|
return EINVAL;
|
|
|
|
error = (algo->init)(&algos, sav);
|
|
if (error)
|
|
return error;
|
|
|
|
off = 0;
|
|
proto = IPPROTO_IPV6;
|
|
nxt = -1;
|
|
ahseen = 0;
|
|
|
|
again:
|
|
newoff = ip6_nexthdr(m, off, proto, &nxt);
|
|
if (newoff < 0)
|
|
newoff = m->m_pkthdr.len;
|
|
else if (newoff <= off) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
switch (proto) {
|
|
case IPPROTO_IPV6:
|
|
/*
|
|
* special treatment is necessary for the first one, not others
|
|
*/
|
|
if (off == 0) {
|
|
struct ip6_hdr ip6copy;
|
|
|
|
if (newoff - off != sizeof(struct ip6_hdr)) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
m_copydata(m, off, newoff - off, (caddr_t)&ip6copy);
|
|
/* RFC2402 */
|
|
ip6copy.ip6_flow = 0;
|
|
ip6copy.ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6copy.ip6_vfc |= IPV6_VERSION;
|
|
ip6copy.ip6_hlim = 0;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6copy.ip6_src))
|
|
ip6copy.ip6_src.s6_addr16[1] = 0x0000;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6copy.ip6_dst))
|
|
ip6copy.ip6_dst.s6_addr16[1] = 0x0000;
|
|
(algo->update)(&algos, (caddr_t)&ip6copy,
|
|
sizeof(struct ip6_hdr));
|
|
} else {
|
|
newoff = m->m_pkthdr.len;
|
|
ah_update_mbuf(m, off, m->m_pkthdr.len - off, algo,
|
|
&algos);
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_AH:
|
|
{
|
|
int siz;
|
|
int hdrsiz;
|
|
|
|
hdrsiz = (sav->flags & SADB_X_EXT_OLD)
|
|
? sizeof(struct ah)
|
|
: sizeof(struct newah);
|
|
siz = (*algo->sumsiz)(sav);
|
|
|
|
/*
|
|
* special treatment is necessary for the first one, not others
|
|
*/
|
|
if (!ahseen) {
|
|
if (newoff - off > MCLBYTES) {
|
|
error = EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (n && newoff - off > MLEN) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (n == NULL) {
|
|
error = ENOBUFS;
|
|
goto fail;
|
|
}
|
|
m_copydata(m, off, newoff - off, mtod(n, caddr_t));
|
|
n->m_len = newoff - off;
|
|
bzero(mtod(n, caddr_t) + hdrsiz, siz);
|
|
(algo->update)(&algos, mtod(n, caddr_t), n->m_len);
|
|
m_free(n);
|
|
n = NULL;
|
|
} else
|
|
ah_update_mbuf(m, off, newoff - off, algo, &algos);
|
|
ahseen++;
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_DSTOPTS:
|
|
{
|
|
struct ip6_ext *ip6e;
|
|
int hdrlen, optlen;
|
|
u_int8_t *p, *optend, *optp;
|
|
|
|
if (newoff - off > MCLBYTES) {
|
|
error = EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (n && newoff - off > MLEN) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (n == NULL) {
|
|
error = ENOBUFS;
|
|
goto fail;
|
|
}
|
|
m_copydata(m, off, newoff - off, mtod(n, caddr_t));
|
|
n->m_len = newoff - off;
|
|
|
|
ip6e = mtod(n, struct ip6_ext *);
|
|
hdrlen = (ip6e->ip6e_len + 1) << 3;
|
|
if (newoff - off < hdrlen) {
|
|
error = EINVAL;
|
|
m_free(n);
|
|
n = NULL;
|
|
goto fail;
|
|
}
|
|
p = mtod(n, u_int8_t *);
|
|
optend = p + hdrlen;
|
|
|
|
/*
|
|
* ICV calculation for the options header including all
|
|
* options. This part is a little tricky since there are
|
|
* two type of options; mutable and immutable. We try to
|
|
* null-out mutable ones here.
|
|
*/
|
|
optp = p + 2;
|
|
while (optp < optend) {
|
|
if (optp[0] == IP6OPT_PAD1)
|
|
optlen = 1;
|
|
else {
|
|
if (optp + 2 > optend) {
|
|
error = EINVAL;
|
|
m_free(n);
|
|
n = NULL;
|
|
goto fail;
|
|
}
|
|
optlen = optp[1] + 2;
|
|
|
|
if (optp[0] & IP6OPT_MUTABLE)
|
|
bzero(optp + 2, optlen - 2);
|
|
}
|
|
|
|
optp += optlen;
|
|
}
|
|
|
|
(algo->update)(&algos, mtod(n, caddr_t), n->m_len);
|
|
m_free(n);
|
|
n = NULL;
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_ROUTING:
|
|
/*
|
|
* For an input packet, we can just calculate `as is'.
|
|
* For an output packet, we assume ip6_output have already
|
|
* made packet how it will be received at the final
|
|
* destination.
|
|
*/
|
|
/* FALLTHROUGH */
|
|
|
|
default:
|
|
ah_update_mbuf(m, off, newoff - off, algo, &algos);
|
|
break;
|
|
}
|
|
|
|
if (newoff < m->m_pkthdr.len) {
|
|
proto = nxt;
|
|
off = newoff;
|
|
goto again;
|
|
}
|
|
|
|
if (len < (*algo->sumsiz)(sav)) {
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
(algo->result)(&algos, &sumbuf[0]);
|
|
bcopy(&sumbuf[0], ahdat, (*algo->sumsiz)(sav));
|
|
|
|
/* just in case */
|
|
if (n)
|
|
m_free(n);
|
|
return 0;
|
|
fail:
|
|
/* just in case */
|
|
if (n)
|
|
m_free(n);
|
|
return error;
|
|
}
|
|
#endif
|