1066 lines
24 KiB
C
1066 lines
24 KiB
C
/* $NetBSD: esp_core.c,v 1.7 2000/08/31 07:33:05 itojun Exp $ */
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/* $KAME: esp_core.c,v 1.37 2000/08/31 07:27:26 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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#include "opt_inet.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/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.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_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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#include <netinet6/ah.h>
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#include <netinet6/esp.h>
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#include <net/pfkeyv2.h>
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#include <netkey/keydb.h>
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#include <crypto/des/des.h>
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#include <crypto/blowfish/blowfish.h>
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#include <crypto/cast128/cast128.h>
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#include <net/net_osdep.h>
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static int esp_null_mature __P((struct secasvar *));
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static int esp_null_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, const struct esp_algorithm *, int));
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static int esp_null_encrypt __P((struct mbuf *, size_t, size_t,
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struct secasvar *, const struct esp_algorithm *, int));
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static int esp_descbc_mature __P((struct secasvar *));
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static int esp_descbc_ivlen __P((const struct esp_algorithm *,
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struct secasvar *));
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static int esp_des_schedule __P((const struct esp_algorithm *,
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struct secasvar *));
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static int esp_des_blockdecrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_des_blockencrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_cbc_mature __P((struct secasvar *));
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static int esp_blowfish_schedule __P((const struct esp_algorithm *,
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struct secasvar *));
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static int esp_blowfish_blockdecrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_blowfish_blockencrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_cast128_schedule __P((const struct esp_algorithm *,
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struct secasvar *));
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static int esp_cast128_blockdecrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_cast128_blockencrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_3des_schedule __P((const struct esp_algorithm *,
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struct secasvar *));
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static int esp_3des_blockdecrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_3des_blockencrypt __P((const struct esp_algorithm *,
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struct secasvar *, u_int8_t *, u_int8_t *));
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static int esp_common_ivlen __P((const struct esp_algorithm *,
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struct secasvar *));
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static int esp_cbc_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, const struct esp_algorithm *, int));
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static int esp_cbc_encrypt __P((struct mbuf *, size_t, size_t,
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struct secasvar *, const struct esp_algorithm *, int));
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static void esp_increment_iv __P((struct secasvar *));
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#define MAXIVLEN 16
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const struct esp_algorithm *
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esp_algorithm_lookup(idx)
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int idx;
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{
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static struct esp_algorithm esp_algorithms[] = {
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{ 8, -1, esp_descbc_mature, 64, 64, sizeof(des_key_schedule),
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"des-cbc",
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esp_descbc_ivlen,
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esp_cbc_decrypt, esp_cbc_encrypt,
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esp_des_schedule,
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esp_des_blockdecrypt, esp_des_blockencrypt, },
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{ 8, 8, esp_cbc_mature, 192, 192, sizeof(des_key_schedule) * 3,
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"3des-cbc",
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esp_common_ivlen,
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esp_cbc_decrypt, esp_cbc_encrypt,
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esp_3des_schedule,
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esp_3des_blockdecrypt, esp_3des_blockencrypt, },
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{ 1, 0, esp_null_mature, 0, 2048, 0, "null",
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esp_common_ivlen, esp_null_decrypt,
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esp_null_encrypt, NULL, },
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{ 8, 8, esp_cbc_mature, 40, 448, sizeof(BF_KEY), "blowfish-cbc",
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esp_common_ivlen, esp_cbc_decrypt,
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esp_cbc_encrypt, esp_blowfish_schedule,
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esp_blowfish_blockdecrypt, esp_blowfish_blockencrypt, },
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{ 8, 8, esp_cbc_mature, 40, 128, sizeof(u_int32_t) * 32,
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"cast128-cbc",
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esp_common_ivlen,
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esp_cbc_decrypt, esp_cbc_encrypt,
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esp_cast128_schedule,
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esp_cast128_blockdecrypt, esp_cast128_blockencrypt, },
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};
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switch (idx) {
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case SADB_EALG_DESCBC:
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return &esp_algorithms[0];
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case SADB_EALG_3DESCBC:
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return &esp_algorithms[1];
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case SADB_EALG_NULL:
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return &esp_algorithms[2];
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case SADB_X_EALG_BLOWFISHCBC:
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return &esp_algorithms[3];
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case SADB_X_EALG_CAST128CBC:
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return &esp_algorithms[4];
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default:
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return NULL;
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}
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}
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int
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esp_schedule(algo, sav)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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{
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int error;
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/* check for key length */
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if (_KEYBITS(sav->key_enc) < algo->keymin ||
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_KEYBITS(sav->key_enc) > algo->keymax) {
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ipseclog((LOG_ERR,
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"esp_schedule %s: unsupported key length %d: "
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"needs %d to %d bits\n", algo->name, _KEYBITS(sav->key_enc),
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algo->keymin, algo->keymax));
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return EINVAL;
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}
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/* already allocated */
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if (sav->sched && sav->schedlen != 0)
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return 0;
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/* no schedule necessary */
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if (!algo->schedule || algo->schedlen == 0)
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return 0;
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sav->sched = malloc(algo->schedlen, M_SECA, M_DONTWAIT);
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if (!sav->sched)
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return ENOBUFS;
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sav->schedlen = algo->schedlen;
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error = (*algo->schedule)(algo, sav);
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if (error) {
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ipseclog((LOG_ERR, "esp_schedule %s: error %d\n",
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algo->name, error));
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free(sav->sched, M_SECA);
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sav->sched = NULL;
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sav->schedlen = 0;
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}
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return error;
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}
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static int
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esp_null_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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esp_null_decrypt(m, off, sav, algo, ivlen)
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struct mbuf *m;
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size_t off; /* offset to ESP header */
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struct secasvar *sav;
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const struct esp_algorithm *algo;
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int ivlen;
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{
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return 0; /* do nothing */
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}
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static int
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esp_null_encrypt(m, off, plen, sav, algo, ivlen)
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struct mbuf *m;
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size_t off; /* offset to ESP header */
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size_t plen; /* payload length (to be encrypted) */
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struct secasvar *sav;
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const struct esp_algorithm *algo;
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int ivlen;
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{
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return 0; /* do nothing */
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}
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static int
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esp_descbc_mature(sav)
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struct secasvar *sav;
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{
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const struct esp_algorithm *algo;
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if (!(sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_IV4B)) {
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ipseclog((LOG_ERR, "esp_cbc_mature: "
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"algorithm incompatible with 4 octets IV length\n"));
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return 1;
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}
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if (!sav->key_enc) {
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ipseclog((LOG_ERR, "esp_descbc_mature: no key is given.\n"));
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return 1;
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}
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algo = esp_algorithm_lookup(sav->alg_enc);
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if (!algo) {
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ipseclog((LOG_ERR,
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"esp_descbc_mature: unsupported algorithm.\n"));
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return 1;
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}
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if (_KEYBITS(sav->key_enc) < algo->keymin ||
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_KEYBITS(sav->key_enc) > algo->keymax) {
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ipseclog((LOG_ERR,
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"esp_descbc_mature: invalid key length %d.\n",
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_KEYBITS(sav->key_enc)));
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return 1;
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}
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/* weak key check */
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if (des_is_weak_key((des_cblock *)_KEYBUF(sav->key_enc))) {
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ipseclog((LOG_ERR,
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"esp_descbc_mature: weak key was passed.\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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esp_descbc_ivlen(algo, sav)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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{
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if (!sav)
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return 8;
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if ((sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_IV4B))
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return 4;
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if (!(sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_DERIV))
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return 4;
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return 8;
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}
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static int
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esp_des_schedule(algo, sav)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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{
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if (des_key_sched((des_cblock *)_KEYBUF(sav->key_enc),
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*(des_key_schedule *)sav->sched))
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return EINVAL;
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else
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return 0;
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}
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static int
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esp_des_blockdecrypt(algo, sav, s, d)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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u_int8_t *s;
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u_int8_t *d;
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{
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/* assumption: d has a good alignment */
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bcopy(s, d, sizeof(DES_LONG) * 2);
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des_encrypt((DES_LONG *)d, *(des_key_schedule *)sav->sched,
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DES_DECRYPT);
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return 0;
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}
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static int
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esp_des_blockencrypt(algo, sav, s, d)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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u_int8_t *s;
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u_int8_t *d;
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{
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/* assumption: d has a good alignment */
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bcopy(s, d, sizeof(DES_LONG) * 2);
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des_encrypt((DES_LONG *)d, *(des_key_schedule *)sav->sched,
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DES_ENCRYPT);
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return 0;
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}
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static int
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esp_cbc_mature(sav)
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struct secasvar *sav;
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{
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int keylen;
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const struct esp_algorithm *algo;
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if (sav->flags & SADB_X_EXT_OLD) {
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ipseclog((LOG_ERR,
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"esp_cbc_mature: algorithm incompatible with esp-old\n"));
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return 1;
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}
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if (sav->flags & SADB_X_EXT_DERIV) {
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ipseclog((LOG_ERR,
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"esp_cbc_mature: algorithm incompatible with derived\n"));
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return 1;
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}
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if (!sav->key_enc) {
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ipseclog((LOG_ERR, "esp_cbc_mature: no key is given.\n"));
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return 1;
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}
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algo = esp_algorithm_lookup(sav->alg_enc);
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if (!algo) {
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ipseclog((LOG_ERR,
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"esp_cbc_mature %s: unsupported algorithm.\n", algo->name));
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return 1;
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}
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keylen = sav->key_enc->sadb_key_bits;
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if (keylen < algo->keymin || algo->keymax < keylen) {
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ipseclog((LOG_ERR,
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"esp_cbc_mature %s: invalid key length %d.\n",
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algo->name, sav->key_enc->sadb_key_bits));
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return 1;
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}
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switch (sav->alg_enc) {
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case SADB_EALG_3DESCBC:
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/* weak key check */
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if (des_is_weak_key((des_cblock *)_KEYBUF(sav->key_enc)) ||
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des_is_weak_key((des_cblock *)(_KEYBUF(sav->key_enc) + 8)) ||
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des_is_weak_key((des_cblock *)(_KEYBUF(sav->key_enc) + 16))) {
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ipseclog((LOG_ERR,
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"esp_cbc_mature %s: weak key was passed.\n",
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algo->name));
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return 1;
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}
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break;
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case SADB_X_EALG_BLOWFISHCBC:
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case SADB_X_EALG_CAST128CBC:
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break;
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}
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return 0;
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}
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static int
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esp_blowfish_schedule(algo, sav)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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{
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BF_set_key((BF_KEY *)sav->sched, _KEYLEN(sav->key_enc),
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_KEYBUF(sav->key_enc));
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return 0;
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}
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static int
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esp_blowfish_blockdecrypt(algo, sav, s, d)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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u_int8_t *s;
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u_int8_t *d;
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{
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/* assumption: d has a good alignment */
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bcopy(s, d, sizeof(BF_LONG) * 2);
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BF_encrypt((BF_LONG *)d, (BF_KEY *)sav->sched, BF_DECRYPT);
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return 0;
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}
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static int
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esp_blowfish_blockencrypt(algo, sav, s, d)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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u_int8_t *s;
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u_int8_t *d;
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{
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/* assumption: d has a good alignment */
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bcopy(s, d, sizeof(BF_LONG) * 2);
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BF_encrypt((BF_LONG *)d, (BF_KEY *)sav->sched, BF_ENCRYPT);
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return 0;
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}
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static int
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esp_cast128_schedule(algo, sav)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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{
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set_cast128_subkey((u_int32_t *)sav->sched, _KEYBUF(sav->key_enc));
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return 0;
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}
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static int
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esp_cast128_blockdecrypt(algo, sav, s, d)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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u_int8_t *s;
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u_int8_t *d;
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{
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if (_KEYLEN(sav->key_enc) <= 80 / 8)
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cast128_decrypt_round12(d, s, (u_int32_t *)sav->sched);
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else
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cast128_decrypt_round16(d, s, (u_int32_t *)sav->sched);
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return 0;
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}
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static int
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esp_cast128_blockencrypt(algo, sav, s, d)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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u_int8_t *s;
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u_int8_t *d;
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{
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if (_KEYLEN(sav->key_enc) <= 80 / 8)
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cast128_encrypt_round12(d, s, (u_int32_t *)sav->sched);
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else
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cast128_encrypt_round16(d, s, (u_int32_t *)sav->sched);
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return 0;
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}
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static int
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esp_3des_schedule(algo, sav)
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const struct esp_algorithm *algo;
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struct secasvar *sav;
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{
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int error;
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des_key_schedule *p;
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int i;
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char *k;
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p = (des_key_schedule *)sav->sched;
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k = _KEYBUF(sav->key_enc);
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for (i = 0; i < 3; i++) {
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error = des_key_sched((des_cblock *)(k + 8 * i), p[i]);
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if (error)
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return EINVAL;
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}
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return 0;
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}
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static int
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esp_3des_blockdecrypt(algo, sav, s, d)
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|
const struct esp_algorithm *algo;
|
|
struct secasvar *sav;
|
|
u_int8_t *s;
|
|
u_int8_t *d;
|
|
{
|
|
des_key_schedule *p;
|
|
|
|
/* assumption: d has a good alignment */
|
|
p = (des_key_schedule *)sav->sched;
|
|
bcopy(s, d, sizeof(DES_LONG) * 2);
|
|
des_encrypt((DES_LONG *)d, p[2], DES_DECRYPT);
|
|
des_encrypt((DES_LONG *)d, p[1], DES_ENCRYPT);
|
|
des_encrypt((DES_LONG *)d, p[0], DES_DECRYPT);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_3des_blockencrypt(algo, sav, s, d)
|
|
const struct esp_algorithm *algo;
|
|
struct secasvar *sav;
|
|
u_int8_t *s;
|
|
u_int8_t *d;
|
|
{
|
|
des_key_schedule *p;
|
|
|
|
/* assumption: d has a good alignment */
|
|
p = (des_key_schedule *)sav->sched;
|
|
bcopy(s, d, sizeof(DES_LONG) * 2);
|
|
des_encrypt((DES_LONG *)d, p[0], DES_ENCRYPT);
|
|
des_encrypt((DES_LONG *)d, p[1], DES_DECRYPT);
|
|
des_encrypt((DES_LONG *)d, p[2], DES_ENCRYPT);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_common_ivlen(algo, sav)
|
|
const struct esp_algorithm *algo;
|
|
struct secasvar *sav;
|
|
{
|
|
|
|
if (!algo)
|
|
panic("esp_common_ivlen: unknown algorithm");
|
|
return algo->ivlenval;
|
|
}
|
|
|
|
static int
|
|
esp_cbc_decrypt(m, off, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
struct secasvar *sav;
|
|
const struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
struct mbuf *s;
|
|
struct mbuf *d, *d0, *dp;
|
|
int soff, doff; /*offset from the head of chain, to head of this mbuf */
|
|
int sn, dn; /*offset from the head of the mbuf, to meat */
|
|
size_t ivoff, bodyoff;
|
|
u_int8_t iv[MAXIVLEN], *ivp;
|
|
u_int8_t sbuf[MAXIVLEN], *sp;
|
|
u_int8_t *p, *q;
|
|
struct mbuf *scut;
|
|
int scutoff;
|
|
int i;
|
|
int blocklen;
|
|
int derived;
|
|
|
|
if (ivlen != sav->ivlen || ivlen > sizeof(iv)) {
|
|
ipseclog((LOG_ERR, "esp_cbc_decrypt %s: "
|
|
"unsupported ivlen %d\n", algo->name, ivlen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
/* assumes blocklen == padbound */
|
|
blocklen = algo->padbound;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (blocklen > sizeof(iv)) {
|
|
ipseclog((LOG_ERR, "esp_cbc_decrypt %s: "
|
|
"unsupported blocklen %d\n", algo->name, blocklen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
#endif
|
|
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
/* RFC 1827 */
|
|
ivoff = off + sizeof(struct esp);
|
|
bodyoff = off + sizeof(struct esp) + ivlen;
|
|
derived = 0;
|
|
} else {
|
|
/* RFC 2406 */
|
|
if (sav->flags & SADB_X_EXT_DERIV) {
|
|
/*
|
|
* draft-ietf-ipsec-ciph-des-derived-00.txt
|
|
* uses sequence number field as IV field.
|
|
*/
|
|
ivoff = off + sizeof(struct esp);
|
|
bodyoff = off + sizeof(struct esp) + sizeof(u_int32_t);
|
|
ivlen = sizeof(u_int32_t);
|
|
derived = 1;
|
|
} else {
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
derived = 0;
|
|
}
|
|
}
|
|
|
|
/* grab iv */
|
|
m_copydata(m, ivoff, ivlen, iv);
|
|
|
|
/* extend iv */
|
|
if (ivlen == blocklen)
|
|
;
|
|
else if (ivlen == 4 && blocklen == 8) {
|
|
bcopy(&iv[0], &iv[4], 4);
|
|
iv[4] ^= 0xff;
|
|
iv[5] ^= 0xff;
|
|
iv[6] ^= 0xff;
|
|
iv[7] ^= 0xff;
|
|
} else {
|
|
ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
|
|
"unsupported ivlen/blocklen: %d %d\n",
|
|
algo->name, ivlen, blocklen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->m_pkthdr.len < bodyoff) {
|
|
ipseclog((LOG_ERR, "esp_cbc_decrypt %s: bad len %d/%lu\n",
|
|
algo->name, m->m_pkthdr.len, (unsigned long)bodyoff));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
if ((m->m_pkthdr.len - bodyoff) % blocklen) {
|
|
ipseclog((LOG_ERR, "esp_cbc_decrypt %s: "
|
|
"payload length must be multiple of %d\n",
|
|
algo->name, blocklen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
s = m;
|
|
d = d0 = dp = NULL;
|
|
soff = doff = sn = dn = 0;
|
|
ivp = sp = NULL;
|
|
|
|
/* skip bodyoff */
|
|
while (soff < bodyoff) {
|
|
if (soff + s->m_len > bodyoff) {
|
|
sn = bodyoff - soff;
|
|
break;
|
|
}
|
|
|
|
soff += s->m_len;
|
|
s = s->m_next;
|
|
}
|
|
scut = s;
|
|
scutoff = sn;
|
|
|
|
/* skip over empty mbuf */
|
|
while (s && s->m_len == 0)
|
|
s = s->m_next;
|
|
|
|
while (soff < m->m_pkthdr.len) {
|
|
/* source */
|
|
if (sn + blocklen <= s->m_len) {
|
|
/* body is continuous */
|
|
sp = mtod(s, u_int8_t *) + sn;
|
|
} else {
|
|
/* body is non-continuous */
|
|
m_copydata(s, sn, blocklen, sbuf);
|
|
sp = sbuf;
|
|
}
|
|
|
|
/* destination */
|
|
if (!d || dn + blocklen > d->m_len) {
|
|
if (d)
|
|
dp = d;
|
|
MGET(d, M_DONTWAIT, MT_DATA);
|
|
i = m->m_pkthdr.len - (soff + sn);
|
|
if (d && i > MLEN) {
|
|
MCLGET(d, M_DONTWAIT);
|
|
if ((d->m_flags & M_EXT) == 0) {
|
|
m_free(d);
|
|
d = NULL;
|
|
}
|
|
}
|
|
if (!d) {
|
|
m_freem(m);
|
|
if (d0)
|
|
m_freem(d0);
|
|
return ENOBUFS;
|
|
}
|
|
if (!d0)
|
|
d0 = d;
|
|
if (dp)
|
|
dp->m_next = d;
|
|
d->m_len = 0;
|
|
d->m_len = (M_TRAILINGSPACE(d) / blocklen) * blocklen;
|
|
if (d->m_len > i)
|
|
d->m_len = i;
|
|
dn = 0;
|
|
}
|
|
|
|
/* decrypt */
|
|
(*algo->blockdecrypt)(algo, sav, sp, mtod(d, u_int8_t *) + dn);
|
|
|
|
/* xor */
|
|
p = ivp ? ivp : iv;
|
|
q = mtod(d, u_int8_t *) + dn;
|
|
for (i = 0; i < blocklen; i++)
|
|
q[i] ^= p[i];
|
|
|
|
/* next iv */
|
|
if (sp == sbuf) {
|
|
bcopy(sbuf, iv, blocklen);
|
|
ivp = NULL;
|
|
} else
|
|
ivp = sp;
|
|
|
|
sn += blocklen;
|
|
dn += blocklen;
|
|
|
|
/* find the next source block */
|
|
while (s && sn >= s->m_len) {
|
|
sn -= s->m_len;
|
|
soff += s->m_len;
|
|
s = s->m_next;
|
|
}
|
|
|
|
/* skip over empty mbuf */
|
|
while (s && s->m_len == 0)
|
|
s = s->m_next;
|
|
}
|
|
|
|
m_freem(scut->m_next);
|
|
scut->m_len = scutoff;
|
|
scut->m_next = d0;
|
|
|
|
/* just in case */
|
|
bzero(iv, sizeof(iv));
|
|
bzero(sbuf, sizeof(sbuf));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_cbc_encrypt(m, off, plen, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
size_t plen;
|
|
struct secasvar *sav;
|
|
const struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
struct mbuf *s;
|
|
struct mbuf *d, *d0, *dp;
|
|
int soff, doff; /*offset from the head of chain, to head of this mbuf */
|
|
int sn, dn; /*offset from the head of the mbuf, to meat */
|
|
size_t ivoff, bodyoff;
|
|
u_int8_t iv[MAXIVLEN], *ivp;
|
|
u_int8_t sbuf[MAXIVLEN], *sp;
|
|
u_int8_t *p, *q;
|
|
struct mbuf *scut;
|
|
int scutoff;
|
|
int i;
|
|
int blocklen;
|
|
int derived;
|
|
|
|
if (ivlen != sav->ivlen || ivlen > sizeof(iv)) {
|
|
ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
|
|
"unsupported ivlen %d\n", algo->name, ivlen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
/* assumes blocklen == padbound */
|
|
blocklen = algo->padbound;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (blocklen > sizeof(iv)) {
|
|
ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
|
|
"unsupported blocklen %d\n", algo->name, blocklen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
#endif
|
|
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
/* RFC 1827 */
|
|
ivoff = off + sizeof(struct esp);
|
|
bodyoff = off + sizeof(struct esp) + ivlen;
|
|
derived = 0;
|
|
} else {
|
|
/* RFC 2406 */
|
|
if (sav->flags & SADB_X_EXT_DERIV) {
|
|
/*
|
|
* draft-ietf-ipsec-ciph-des-derived-00.txt
|
|
* uses sequence number field as IV field.
|
|
*/
|
|
ivoff = off + sizeof(struct esp);
|
|
bodyoff = off + sizeof(struct esp) + sizeof(u_int32_t);
|
|
ivlen = sizeof(u_int32_t);
|
|
derived = 1;
|
|
} else {
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
derived = 0;
|
|
}
|
|
}
|
|
|
|
/* put iv into the packet. if we are in derived mode, use seqno. */
|
|
if (derived)
|
|
m_copydata(m, ivoff, ivlen, iv);
|
|
else {
|
|
bcopy(sav->iv, iv, ivlen);
|
|
/* maybe it is better to overwrite dest, not source */
|
|
m_copyback(m, ivoff, ivlen, iv);
|
|
}
|
|
|
|
/* extend iv */
|
|
if (ivlen == blocklen)
|
|
;
|
|
else if (ivlen == 4 && blocklen == 8) {
|
|
bcopy(&iv[0], &iv[4], 4);
|
|
iv[4] ^= 0xff;
|
|
iv[5] ^= 0xff;
|
|
iv[6] ^= 0xff;
|
|
iv[7] ^= 0xff;
|
|
} else {
|
|
ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
|
|
"unsupported ivlen/blocklen: %d %d\n",
|
|
algo->name, ivlen, blocklen));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (m->m_pkthdr.len < bodyoff) {
|
|
ipseclog((LOG_ERR, "esp_cbc_encrypt %s: bad len %d/%lu\n",
|
|
algo->name, m->m_pkthdr.len, (unsigned long)bodyoff));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
if ((m->m_pkthdr.len - bodyoff) % blocklen) {
|
|
ipseclog((LOG_ERR, "esp_cbc_encrypt %s: "
|
|
"payload length must be multiple of %lu\n",
|
|
algo->name, (unsigned long)algo->padbound));
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
s = m;
|
|
d = d0 = dp = NULL;
|
|
soff = doff = sn = dn = 0;
|
|
ivp = sp = NULL;
|
|
|
|
/* skip bodyoff */
|
|
while (soff < bodyoff) {
|
|
if (soff + s->m_len > bodyoff) {
|
|
sn = bodyoff - soff;
|
|
break;
|
|
}
|
|
|
|
soff += s->m_len;
|
|
s = s->m_next;
|
|
}
|
|
scut = s;
|
|
scutoff = sn;
|
|
|
|
/* skip over empty mbuf */
|
|
while (s && s->m_len == 0)
|
|
s = s->m_next;
|
|
|
|
while (soff < m->m_pkthdr.len) {
|
|
/* source */
|
|
if (sn + blocklen <= s->m_len) {
|
|
/* body is continuous */
|
|
sp = mtod(s, u_int8_t *) + sn;
|
|
} else {
|
|
/* body is non-continuous */
|
|
m_copydata(s, sn, blocklen, sbuf);
|
|
sp = sbuf;
|
|
}
|
|
|
|
/* destination */
|
|
if (!d || dn + blocklen > d->m_len) {
|
|
if (d)
|
|
dp = d;
|
|
MGET(d, M_DONTWAIT, MT_DATA);
|
|
i = m->m_pkthdr.len - (soff + sn);
|
|
if (d && i > MLEN) {
|
|
MCLGET(d, M_DONTWAIT);
|
|
if ((d->m_flags & M_EXT) == 0) {
|
|
m_free(d);
|
|
d = NULL;
|
|
}
|
|
}
|
|
if (!d) {
|
|
m_freem(m);
|
|
if (d0)
|
|
m_freem(d0);
|
|
return ENOBUFS;
|
|
}
|
|
if (!d0)
|
|
d0 = d;
|
|
if (dp)
|
|
dp->m_next = d;
|
|
d->m_len = 0;
|
|
d->m_len = (M_TRAILINGSPACE(d) / blocklen) * blocklen;
|
|
if (d->m_len > i)
|
|
d->m_len = i;
|
|
dn = 0;
|
|
}
|
|
|
|
/* xor */
|
|
p = ivp ? ivp : iv;
|
|
q = sp;
|
|
for (i = 0; i < blocklen; i++)
|
|
q[i] ^= p[i];
|
|
|
|
/* encrypt */
|
|
(*algo->blockencrypt)(algo, sav, sp, mtod(d, u_int8_t *) + dn);
|
|
|
|
/* next iv */
|
|
ivp = mtod(d, u_int8_t *) + dn;
|
|
|
|
sn += blocklen;
|
|
dn += blocklen;
|
|
|
|
/* find the next source block */
|
|
while (s && sn >= s->m_len) {
|
|
sn -= s->m_len;
|
|
soff += s->m_len;
|
|
s = s->m_next;
|
|
}
|
|
|
|
/* skip over empty mbuf */
|
|
while (s && s->m_len == 0)
|
|
s = s->m_next;
|
|
}
|
|
|
|
m_freem(scut->m_next);
|
|
scut->m_len = scutoff;
|
|
scut->m_next = d0;
|
|
|
|
/* just in case */
|
|
bzero(iv, sizeof(iv));
|
|
bzero(sbuf, sizeof(sbuf));
|
|
|
|
esp_increment_iv(sav);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* increment iv.
|
|
*/
|
|
static void
|
|
esp_increment_iv(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
u_int8_t *x;
|
|
u_int8_t y;
|
|
int i;
|
|
|
|
y = time.tv_sec & 0xff;
|
|
if (!y) y++;
|
|
x = (u_int8_t *)sav->iv;
|
|
for (i = 0; i < sav->ivlen; i++) {
|
|
*x = (*x + y) & 0xff;
|
|
x++;
|
|
}
|
|
}
|
|
|
|
/*------------------------------------------------------------*/
|
|
|
|
/* does not free m0 on error */
|
|
int
|
|
esp_auth(m0, skip, length, sav, sum)
|
|
struct mbuf *m0;
|
|
size_t skip; /* offset to ESP header */
|
|
size_t length; /* payload length */
|
|
struct secasvar *sav;
|
|
u_char *sum;
|
|
{
|
|
struct mbuf *m;
|
|
size_t off;
|
|
struct ah_algorithm_state s;
|
|
u_char sumbuf[AH_MAXSUMSIZE];
|
|
const struct ah_algorithm *algo;
|
|
size_t siz;
|
|
int error;
|
|
|
|
/* sanity checks */
|
|
if (m0->m_pkthdr.len < skip) {
|
|
ipseclog((LOG_DEBUG, "esp_auth: mbuf length < skip\n"));
|
|
return EINVAL;
|
|
}
|
|
if (m0->m_pkthdr.len < skip + length) {
|
|
ipseclog((LOG_DEBUG,
|
|
"esp_auth: mbuf length < skip + length\n"));
|
|
return EINVAL;
|
|
}
|
|
/*
|
|
* length of esp part (excluding authentication data) must be 4n,
|
|
* since nexthdr must be at offset 4n+3.
|
|
*/
|
|
if (length % 4) {
|
|
ipseclog((LOG_ERR, "esp_auth: length is not multiple of 4\n"));
|
|
return EINVAL;
|
|
}
|
|
if (!sav) {
|
|
ipseclog((LOG_DEBUG, "esp_auth: NULL SA passed\n"));
|
|
return EINVAL;
|
|
}
|
|
algo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!algo) {
|
|
ipseclog((LOG_ERR,
|
|
"esp_auth: bad ESP auth algorithm passed: %d\n",
|
|
sav->alg_auth));
|
|
return EINVAL;
|
|
}
|
|
|
|
m = m0;
|
|
off = 0;
|
|
|
|
siz = (((*algo->sumsiz)(sav) + 3) & ~(4 - 1));
|
|
if (sizeof(sumbuf) < siz) {
|
|
ipseclog((LOG_DEBUG,
|
|
"esp_auth: AH_MAXSUMSIZE is too small: siz=%lu\n",
|
|
(u_long)siz));
|
|
return EINVAL;
|
|
}
|
|
|
|
/* skip the header */
|
|
while (skip) {
|
|
if (!m)
|
|
panic("mbuf chain?");
|
|
if (m->m_len <= skip) {
|
|
skip -= m->m_len;
|
|
m = m->m_next;
|
|
off = 0;
|
|
} else {
|
|
off = skip;
|
|
skip = 0;
|
|
}
|
|
}
|
|
|
|
error = (*algo->init)(&s, sav);
|
|
if (error)
|
|
return error;
|
|
|
|
while (0 < length) {
|
|
if (!m)
|
|
panic("mbuf chain?");
|
|
|
|
if (m->m_len - off < length) {
|
|
(*algo->update)(&s, mtod(m, u_char *) + off,
|
|
m->m_len - off);
|
|
length -= m->m_len - off;
|
|
m = m->m_next;
|
|
off = 0;
|
|
} else {
|
|
(*algo->update)(&s, mtod(m, u_char *) + off, length);
|
|
break;
|
|
}
|
|
}
|
|
(*algo->result)(&s, sumbuf);
|
|
bcopy(sumbuf, sum, siz); /*XXX*/
|
|
|
|
return 0;
|
|
}
|