1236 lines
29 KiB
C
1236 lines
29 KiB
C
/*
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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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* $FreeBSD$
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*/
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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/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 <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 <netinet6/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/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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#ifdef INET6
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#include <netinet6/ipsec6.h>
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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/key_var.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 <crypto/rc5/rc5.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_ivlen __P((struct secasvar *));
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static int esp_null_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, 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 *, 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((struct secasvar *));
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static int esp_descbc_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_descbc_encrypt __P((struct mbuf *, size_t, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_cbc_mature __P((struct secasvar *));
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static int esp_blowfish_cbc_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_blowfish_cbc_encrypt __P((struct mbuf *, size_t,
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size_t, struct secasvar *, struct esp_algorithm *, int));
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static int esp_blowfish_cbc_ivlen __P((struct secasvar *));
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static int esp_cast128cbc_ivlen __P((struct secasvar *));
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static int esp_cast128cbc_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_cast128cbc_encrypt __P((struct mbuf *, size_t, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_3descbc_ivlen __P((struct secasvar *));
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static int esp_3descbc_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_3descbc_encrypt __P((struct mbuf *, size_t, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_rc5cbc_ivlen __P((struct secasvar *));
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static int esp_rc5cbc_decrypt __P((struct mbuf *, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static int esp_rc5cbc_encrypt __P((struct mbuf *, size_t, size_t,
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struct secasvar *, struct esp_algorithm *, int));
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static void esp_increment_iv __P((struct secasvar *));
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static caddr_t mbuf_find_offset __P((struct mbuf *, size_t, size_t));
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/* NOTE: The order depends on SADB_EALG_x in netkey/keyv2.h */
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struct esp_algorithm esp_algorithms[] = {
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{ 0, 0, 0, 0, 0, 0, 0, },
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{ 8, esp_descbc_mature, 64, 64,
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esp_descbc_ivlen, esp_descbc_decrypt, esp_descbc_encrypt, },
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{ 8, esp_cbc_mature, 192, 192,
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esp_3descbc_ivlen, esp_3descbc_decrypt, esp_3descbc_encrypt, },
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{ 1, esp_null_mature, 0, 2048,
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esp_null_ivlen, esp_null_decrypt, esp_null_encrypt, },
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{ 8, esp_cbc_mature, 40, 448,
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esp_blowfish_cbc_ivlen, esp_blowfish_cbc_decrypt,
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esp_blowfish_cbc_encrypt, },
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{ 8, esp_cbc_mature, 40, 128,
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esp_cast128cbc_ivlen, esp_cast128cbc_decrypt,
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esp_cast128cbc_encrypt, },
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{ 8, esp_cbc_mature, 40, 2040,
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esp_rc5cbc_ivlen, esp_rc5cbc_decrypt, esp_rc5cbc_encrypt, },
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};
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/*
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* mbuf assumption: foo_encrypt() assumes that IV part is placed in a single
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* mbuf, not across multiple mbufs.
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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_ivlen(sav)
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struct secasvar *sav;
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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_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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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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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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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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printf("esp_cbc_mature: 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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printf("esp_descbc_mature: no key is given.\n");
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return 1;
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}
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algo = &esp_algorithms[sav->alg_enc];
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if (_KEYBITS(sav->key_enc) < algo->keymin
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|| algo->keymax < _KEYBITS(sav->key_enc)) {
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printf("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((C_Block *)_KEYBUF(sav->key_enc))) {
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printf("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(sav)
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struct secasvar *sav;
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{
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if (sav && (sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_IV4B))
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return 4;
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if (sav && !(sav->flags & SADB_X_EXT_OLD) && (sav->flags & SADB_X_EXT_DERIV))
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return 4;
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else
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return 8;
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}
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static int
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esp_descbc_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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struct esp_algorithm *algo;
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int ivlen;
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{
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size_t ivoff = 0;
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size_t bodyoff = 0;
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u_int8_t *iv;
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size_t plen;
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u_int8_t tiv[8];
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int derived;
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derived = 0;
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/* sanity check */
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if (ivlen != sav->ivlen) {
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printf("esp_descbc_decrypt: bad ivlen %d/%d\n",
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ivlen, sav->ivlen);
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return EINVAL;
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}
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if (_KEYBITS(sav->key_enc) < algo->keymin
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|| algo->keymax < _KEYBITS(sav->key_enc)) {
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printf("esp_descbc_decrypt: bad keylen %d\n",
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_KEYBITS(sav->key_enc));
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return EINVAL;
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}
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if (sav->flags & SADB_X_EXT_OLD) {
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/* RFC 1827 */
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ivoff = off + sizeof(struct esp);
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bodyoff = off + sizeof(struct esp) + ivlen;
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derived = 0;
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} else {
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/* RFC 2406 */
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if (sav->flags & SADB_X_EXT_DERIV) {
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/*
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* draft-ietf-ipsec-ciph-des-derived-00.txt
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* uses sequence number field as IV field.
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* This draft has been deleted, but you can get from
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* ftp://ftp.kame.net/pub/internet-drafts/.
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*/
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ivoff = off + sizeof(struct esp);
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bodyoff = off + sizeof(struct esp) + sizeof(u_int32_t);
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ivlen = sizeof(u_int32_t);
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derived = 1;
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} else {
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ivoff = off + sizeof(struct newesp);
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bodyoff = off + sizeof(struct newesp) + ivlen;
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derived = 0;
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}
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}
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if (ivlen == 4) {
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iv = &tiv[0];
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m_copydata(m, ivoff, 4, &tiv[0]);
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m_copydata(m, ivoff, 4, &tiv[4]);
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tiv[4] ^= 0xff;
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tiv[5] ^= 0xff;
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tiv[6] ^= 0xff;
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tiv[7] ^= 0xff;
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} else if (ivlen == 8) {
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iv = &tiv[0];
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m_copydata(m, ivoff, 8, &tiv[0]);
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} else {
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printf("esp_descbc_decrypt: unsupported ivlen %d\n", ivlen);
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return EINVAL;
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}
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plen = m->m_pkthdr.len;
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if (plen < bodyoff)
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panic("esp_descbc_decrypt: too short packet: len=%lu",
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(u_long)plen);
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plen -= bodyoff;
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if (plen % 8) {
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printf("esp_descbc_decrypt: "
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"payload length must be multiple of 8\n");
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return EINVAL;
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}
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{
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int deserr;
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des_key_schedule ks;
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deserr = des_key_sched((C_Block *)_KEYBUF(sav->key_enc), ks);
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if (deserr != 0) {
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printf("esp_descbc_decrypt: key error %d\n", deserr);
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return EINVAL;
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}
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des_cbc_encrypt(m, bodyoff, plen, ks, (C_Block *)iv, DES_DECRYPT);
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/* for safety */
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bzero(&ks, sizeof(des_key_schedule));
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}
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/* for safety */
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bzero(&tiv[0], sizeof(tiv));
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return 0;
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}
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static int
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esp_descbc_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 decrypted) */
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struct secasvar *sav;
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struct esp_algorithm *algo;
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int ivlen;
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{
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size_t ivoff = 0;
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size_t bodyoff = 0;
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u_int8_t *iv;
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u_int8_t tiv[8];
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int derived;
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derived = 0;
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/* sanity check */
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if (plen % 8) {
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printf("esp_descbc_encrypt: "
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"payload length must be multiple of 8\n");
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return EINVAL;
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}
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if (sav->ivlen != ivlen) {
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printf("esp_descbc_encrypt: bad ivlen %d/%d\n",
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ivlen, sav->ivlen);
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return EINVAL;
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}
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if (_KEYBITS(sav->key_enc) < algo->keymin
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|| algo->keymax < _KEYBITS(sav->key_enc)) {
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printf("esp_descbc_encrypt: bad keylen %d\n",
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_KEYBITS(sav->key_enc));
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return EINVAL;
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}
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if (sav->flags & SADB_X_EXT_OLD) {
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/* RFC 1827 */
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/*
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* draft-ietf-ipsec-ciph-des-derived-00.txt
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* uses sequence number field as IV field.
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* This draft has been deleted, see above.
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*/
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ivoff = off + sizeof(struct esp);
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bodyoff = off + sizeof(struct esp) + ivlen;
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derived = 0;
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} else {
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/* RFC 2406 */
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if (sav->flags & SADB_X_EXT_DERIV) {
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/*
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* draft-ietf-ipsec-ciph-des-derived-00.txt
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* uses sequence number field as IV field.
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* This draft has been deleted, see above.
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*/
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ivoff = off + sizeof(struct esp);
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bodyoff = off + sizeof(struct esp) + sizeof(u_int32_t);
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ivlen = sizeof(u_int32_t);
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derived = 1;
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} else {
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ivoff = off + sizeof(struct newesp);
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bodyoff = off + sizeof(struct newesp) + ivlen;
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derived = 0;
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}
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}
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if (m->m_pkthdr.len < bodyoff)
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panic("assumption failed: mbuf too short");
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iv = mbuf_find_offset(m, ivoff, ivlen);
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if (!iv)
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panic("assumption failed: bad mbuf chain");
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if (ivlen == 4) {
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if (!derived) {
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bcopy(sav->iv, &tiv[0], 4);
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bcopy(sav->iv, &tiv[4], 4);
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tiv[4] ^= 0xff;
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tiv[5] ^= 0xff;
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tiv[6] ^= 0xff;
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tiv[7] ^= 0xff;
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bcopy(&tiv[0], iv, 4);
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iv = &tiv[0];
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} else {
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bcopy(iv, &tiv[0], 4);
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bcopy(iv, &tiv[4], 4);
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tiv[4] ^= 0xff;
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tiv[5] ^= 0xff;
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tiv[6] ^= 0xff;
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tiv[7] ^= 0xff;
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iv = &tiv[0];
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}
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} else if (ivlen == 8)
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bcopy((caddr_t)sav->iv, (caddr_t)iv, ivlen);
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else {
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printf("esp_descbc_encrypt: unsupported ivlen %d\n", ivlen);
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return EINVAL;
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}
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{
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int deserr;
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des_key_schedule ks;
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deserr = des_key_sched((C_Block *)_KEYBUF(sav->key_enc), ks);
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if (deserr != 0) {
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printf("esp_descbc_encrypt: key error %d\n", deserr);
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return EINVAL;
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}
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des_cbc_encrypt(m, bodyoff, plen, ks, (C_Block *)iv, DES_ENCRYPT);
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/* for safety */
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bzero(&ks, sizeof(des_key_schedule));
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}
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esp_increment_iv(sav);
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/* for safety */
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bzero(&tiv[0], sizeof(tiv));
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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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struct esp_algorithm *algo;
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if (sav->flags & SADB_X_EXT_OLD) {
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printf("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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printf("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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printf("esp_cbc_mature: no key is given.\n");
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return 1;
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}
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algo = &esp_algorithms[sav->alg_enc];
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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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printf("esp_cbc_mature: invalid key length %d.\n",
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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((C_Block *)_KEYBUF(sav->key_enc))
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|| des_is_weak_key((C_Block *)(_KEYBUF(sav->key_enc) + 8))
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|| des_is_weak_key((C_Block *)(_KEYBUF(sav->key_enc) + 16))) {
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printf("esp_cbc_mature: weak key was passed.\n");
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return 1;
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}
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break;
|
|
case SADB_EALG_BLOWFISHCBC:
|
|
case SADB_EALG_CAST128CBC:
|
|
case SADB_EALG_RC5CBC:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_blowfish_cbc_decrypt(m, off, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off; /* offset to ESP header */
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t *iv;
|
|
u_int8_t tiv[8];
|
|
size_t plen;
|
|
static BF_KEY key; /* made static to avoid kernel stack overflow */
|
|
int s;
|
|
|
|
/* sanity check */
|
|
if (sav->ivlen != ivlen) {
|
|
printf("esp_blowfish_cbc_decrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| algo->keymax < _KEYBITS(sav->key_enc)) {
|
|
printf("esp_blowfish_cbc_decrypt: unsupported key length %d: "
|
|
"need %d to %d bits\n", _KEYBITS(sav->key_enc),
|
|
algo->keymin, algo->keymax);
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_blowfish_cbc_decrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_blowfish_cbc_decrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
iv = &tiv[0];
|
|
m_copydata(m, ivoff, 8, &tiv[0]);
|
|
|
|
plen = m->m_pkthdr.len;
|
|
if (plen < bodyoff)
|
|
panic("esp_blowfish_cbc_decrypt: too short packet: len=%lu",
|
|
(u_long)plen);
|
|
plen -= bodyoff;
|
|
|
|
if (plen % 8) {
|
|
printf("esp_blowfish_cbc_decrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
s = splnet(); /* XXX correct? */
|
|
|
|
BF_set_key(&key, _KEYBITS(sav->key_enc) / 8, _KEYBUF(sav->key_enc));
|
|
BF_cbc_encrypt_m(m, bodyoff, plen, &key, iv, BF_DECRYPT);
|
|
|
|
/* for safety */
|
|
bzero(&key, sizeof(BF_KEY));
|
|
|
|
splx(s);
|
|
|
|
/* for safety */
|
|
bzero(&tiv[0], sizeof(tiv));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_blowfish_cbc_encrypt(m, off, plen, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off; /* offset to ESP header */
|
|
size_t plen; /* payload length (to be decrypted) */
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t *iv;
|
|
static BF_KEY key; /* made static to avoid kernel stack overflow */
|
|
int s;
|
|
|
|
/* sanity check */
|
|
if (plen % 8) {
|
|
printf("esp_blowfish_cbc_encrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
if (sav->ivlen != ivlen) {
|
|
printf("esp_blowfish_cbc_encrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| algo->keymax < _KEYBITS(sav->key_enc)) {
|
|
printf("esp_blowfish_cbc_encrypt: unsupported key length %d: "
|
|
"need %d to %d bits\n", _KEYBITS(sav->key_enc),
|
|
algo->keymin, algo->keymax);
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_blowfish_cbc_encrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_blowfish_cbc_encrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
|
|
if (m->m_pkthdr.len < bodyoff)
|
|
panic("assumption failed: mbuf too short");
|
|
iv = mbuf_find_offset(m, ivoff, ivlen);
|
|
if (!iv)
|
|
panic("assumption failed: bad mbuf chain");
|
|
|
|
bcopy((caddr_t)sav->iv, (caddr_t)iv, ivlen);
|
|
|
|
s = splnet(); /* XXX correct? */
|
|
|
|
BF_set_key(&key, _KEYBITS(sav->key_enc) / 8, _KEYBUF(sav->key_enc));
|
|
BF_cbc_encrypt_m(m, bodyoff, plen, &key, iv, BF_ENCRYPT);
|
|
|
|
/* for safety */
|
|
bzero(&key, sizeof(BF_KEY));
|
|
|
|
splx(s);
|
|
|
|
esp_increment_iv(sav);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_blowfish_cbc_ivlen(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
return 8;
|
|
}
|
|
|
|
static int
|
|
esp_cast128cbc_ivlen(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
return 8;
|
|
}
|
|
|
|
static int
|
|
esp_cast128cbc_decrypt(m, off, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t iv[8];
|
|
size_t plen;
|
|
|
|
/* sanity check */
|
|
if (ivlen != sav->ivlen) {
|
|
printf("esp_cast128cbc_decrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| _KEYBITS(sav->key_enc) > algo->keymax) {
|
|
printf("esp_cast128cbc_decrypt: unsupported key length %d: "
|
|
"need %d to %d bits\n", _KEYBITS(sav->key_enc),
|
|
algo->keymin, algo->keymax);
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_cast128cbc_decrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_cast128cbc_decrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
|
|
/* copy mbuf's IV into iv */
|
|
m_copydata(m, ivoff, 8, iv);
|
|
|
|
plen = m->m_pkthdr.len;
|
|
if (plen < bodyoff) {
|
|
panic("esp_cast128cbc_decrypt: too short packet: len=%lu\n",
|
|
(u_long)plen);
|
|
}
|
|
plen -= bodyoff;
|
|
|
|
if (plen % 8) {
|
|
printf("esp_cast128cbc_decrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
/* decrypt */
|
|
{
|
|
u_int8_t key[16];
|
|
u_int32_t subkey[32];
|
|
|
|
bzero(key, sizeof(key));
|
|
bcopy(_KEYBUF(sav->key_enc), key, _KEYLEN(sav->key_enc));
|
|
|
|
set_cast128_subkey(subkey, key);
|
|
cast128_cbc_process(m, bodyoff, plen, subkey, iv,
|
|
_KEYBITS(sav->key_enc) / 8, CAST128_DECRYPT);
|
|
|
|
/* for safety */
|
|
bzero(subkey, sizeof(subkey));
|
|
bzero(key, sizeof(key));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_cast128cbc_encrypt(m, off, plen, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
size_t plen;
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t *iv;
|
|
|
|
/* sanity check */
|
|
if (plen % 8) {
|
|
printf("esp_cast128cbc_encrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
if (sav->ivlen != ivlen) {
|
|
printf("esp_cast128cbc_encrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| _KEYBITS(sav->key_enc) > algo->keymax) {
|
|
printf("esp_cast128cbc_encrypt: unsupported key length %d: "
|
|
"needs %d to %d bits\n", _KEYBITS(sav->key_enc),
|
|
algo->keymin, algo->keymax);
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_cast128cbc_encrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_cast128cbc_encrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
|
|
if (m->m_pkthdr.len < bodyoff)
|
|
panic("assumption failed: mbuf too short");
|
|
iv = mbuf_find_offset(m, ivoff, ivlen);
|
|
if (!iv)
|
|
panic("assumption failed: bad mbuf chain");
|
|
|
|
bcopy(sav->iv, iv, ivlen);
|
|
|
|
/* encrypt */
|
|
{
|
|
u_int8_t key[16];
|
|
u_int32_t subkey[32];
|
|
|
|
bzero(key, sizeof(key));
|
|
bcopy(_KEYBUF(sav->key_enc), key, _KEYLEN(sav->key_enc));
|
|
|
|
set_cast128_subkey(subkey, key);
|
|
cast128_cbc_process(m, bodyoff, plen, subkey, iv,
|
|
_KEYBITS(sav->key_enc) / 8, CAST128_ENCRYPT);
|
|
|
|
/* for safety */
|
|
bzero(subkey, sizeof(subkey));
|
|
bzero(key, sizeof(key));
|
|
}
|
|
|
|
esp_increment_iv(sav);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_3descbc_ivlen(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
return 8;
|
|
}
|
|
|
|
static int
|
|
esp_3descbc_decrypt(m, off, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t *iv;
|
|
size_t plen;
|
|
u_int8_t tiv[8];
|
|
|
|
/* sanity check */
|
|
if (ivlen != sav->ivlen) {
|
|
printf("esp_3descbc_decrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| algo->keymax < _KEYBITS(sav->key_enc)) {
|
|
printf("esp_3descbc_decrypt: bad keylen %d\n",
|
|
_KEYBITS(sav->key_enc));
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_3descbc_decrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_3descbc_decrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
iv = &tiv[0];
|
|
m_copydata(m, ivoff, 8, &tiv[0]);
|
|
|
|
plen = m->m_pkthdr.len;
|
|
if (plen < bodyoff)
|
|
panic("esp_3descbc_decrypt: too short packet: len=%lu",
|
|
(u_long)plen);
|
|
|
|
plen -= bodyoff;
|
|
|
|
if (plen % 8) {
|
|
printf("esp_3descbc_decrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
/* decrypt packet */
|
|
{
|
|
int deserr[3];
|
|
des_key_schedule ks[3];
|
|
|
|
deserr[0] = des_key_sched((C_Block *)_KEYBUF(sav->key_enc),ks[0]);
|
|
deserr[1] = des_key_sched((C_Block *)(_KEYBUF(sav->key_enc) + 8), ks[1]);
|
|
deserr[2] = des_key_sched((C_Block *)(_KEYBUF(sav->key_enc) + 16), ks[2]);
|
|
if ((deserr[0] != 0) || (deserr[1] != 0) || (deserr[2] != 0)) {
|
|
printf("esp_3descbc_decrypt: key error %d/%d/%d\n",
|
|
deserr[0], deserr[1], deserr[2]);
|
|
return EINVAL;
|
|
}
|
|
|
|
des_3cbc_process(m, bodyoff, plen, ks, (C_Block *)iv, DES_DECRYPT);
|
|
|
|
/* for safety */
|
|
bzero(ks[0], sizeof(des_key_schedule)*3);
|
|
}
|
|
|
|
/* for safety */
|
|
bzero(&tiv[0], sizeof(tiv));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_3descbc_encrypt(m, off, plen, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
size_t plen;
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t *iv;
|
|
|
|
/* sanity check */
|
|
if (plen % 8) {
|
|
printf("esp_3descbc_encrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
if (sav->ivlen != ivlen) {
|
|
printf("esp_3descbc_encrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| algo->keymax < _KEYBITS(sav->key_enc)) {
|
|
printf("esp_3descbc_encrypt: bad keylen %d\n",
|
|
_KEYBITS(sav->key_enc));
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_3descbc_encrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_3descbc_encrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
|
|
if (m->m_pkthdr.len < bodyoff)
|
|
panic("assumption failed: mbuf too short");
|
|
iv = mbuf_find_offset(m, ivoff, ivlen);
|
|
if (!iv)
|
|
panic("assumption failed: bad mbuf chain");
|
|
|
|
bcopy((caddr_t)sav->iv, (caddr_t)iv, ivlen);
|
|
|
|
/* encrypt packet */
|
|
{
|
|
int deserr[3];
|
|
des_key_schedule ks[3];
|
|
|
|
deserr[0] = des_key_sched((C_Block *)_KEYBUF(sav->key_enc), ks[0]);
|
|
deserr[1] = des_key_sched((C_Block *)(_KEYBUF(sav->key_enc) + 8), ks[1]);
|
|
deserr[2] = des_key_sched((C_Block *)(_KEYBUF(sav->key_enc) + 16), ks[2]);
|
|
if ((deserr[0] != 0) || (deserr[1] != 0) || (deserr[2] != 0)) {
|
|
printf("esp_3descbc_encrypt: key error %d/%d/%d\n",
|
|
deserr[0], deserr[1], deserr[2]);
|
|
return EINVAL;
|
|
}
|
|
|
|
des_3cbc_process(m, bodyoff, plen, ks, (C_Block *)iv, DES_ENCRYPT);
|
|
|
|
/* for safety */
|
|
bzero(ks[0], sizeof(des_key_schedule)*3);
|
|
}
|
|
|
|
esp_increment_iv(sav);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_rc5cbc_ivlen(sav)
|
|
struct secasvar *sav;
|
|
{
|
|
return 8;
|
|
}
|
|
|
|
static int
|
|
esp_rc5cbc_decrypt(m, off, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t iv[8];
|
|
size_t plen;
|
|
|
|
/* sanity check */
|
|
if (sav->ivlen != ivlen) {
|
|
printf("esp_rc5cbc_decrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if ((_KEYBITS(sav->key_enc) < 40) || (_KEYBITS(sav->key_enc) > 2040)) {
|
|
printf("esp_rc5cbc_decrypt: unsupported key length %d: "
|
|
"need 40 to 2040 bit\n", _KEYBITS(sav->key_enc));
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_rc5cbc_decrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_rc5cbc_decrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
|
|
/* copy mbuf's IV into iv */
|
|
m_copydata(m, ivoff, 8, iv);
|
|
|
|
plen = m->m_pkthdr.len;
|
|
if (plen < bodyoff) {
|
|
panic("esp_rc5cbc_decrypt: too short packet: len=%lu",
|
|
(u_long)plen);
|
|
}
|
|
plen -= bodyoff;
|
|
|
|
if (plen % 8) {
|
|
printf("esp_rc5cbc_decrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
/* decrypt */
|
|
{
|
|
RC5_WORD e_key[34];
|
|
|
|
set_rc5_expandkey(e_key, _KEYBUF(sav->key_enc),
|
|
_KEYBITS(sav->key_enc) / 8, 16);
|
|
rc5_cbc_process(m, bodyoff, plen, e_key, iv, RC5_DECRYPT);
|
|
|
|
/* for safety */
|
|
bzero(e_key, sizeof(e_key));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
esp_rc5cbc_encrypt(m, off, plen, sav, algo, ivlen)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
size_t plen;
|
|
struct secasvar *sav;
|
|
struct esp_algorithm *algo;
|
|
int ivlen;
|
|
{
|
|
size_t ivoff;
|
|
size_t bodyoff;
|
|
u_int8_t *iv;
|
|
|
|
/* sanity check */
|
|
if (plen % 8) {
|
|
printf("esp_rc5cbc_encrypt: "
|
|
"payload length must be multiple of 8\n");
|
|
return EINVAL;
|
|
}
|
|
if (sav->ivlen != ivlen) {
|
|
printf("esp_rc5cbc_encrypt: bad ivlen %d/%d\n",
|
|
ivlen, sav->ivlen);
|
|
return EINVAL;
|
|
}
|
|
if (_KEYBITS(sav->key_enc) < algo->keymin
|
|
|| _KEYBITS(sav->key_enc) > algo->keymax) {
|
|
printf("esp_rc5cbc_encrypt: unsupported key length %d: "
|
|
"need %d to %d bits\n", _KEYBITS(sav->key_enc),
|
|
algo->keymin, algo->keymax);
|
|
return EINVAL;
|
|
}
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
printf("esp_rc5cbc_encrypt: unsupported ESP version\n");
|
|
return EINVAL;
|
|
}
|
|
if (ivlen != 8) {
|
|
printf("esp_rc5cbc_encrypt: unsupported ivlen %d "
|
|
"(this should never happen)\n", ivlen);
|
|
return EINVAL;
|
|
}
|
|
|
|
ivoff = off + sizeof(struct newesp);
|
|
bodyoff = off + sizeof(struct newesp) + ivlen;
|
|
|
|
if (m->m_pkthdr.len < bodyoff)
|
|
panic("assumption failed: mbuf too short");
|
|
iv = mbuf_find_offset(m, ivoff, ivlen);
|
|
if (!iv)
|
|
panic("assumption failed: bad mbuf chain");
|
|
|
|
bcopy(sav->iv, iv, ivlen);
|
|
|
|
/* encrypt */
|
|
{
|
|
RC5_WORD e_key[34];
|
|
|
|
set_rc5_expandkey(e_key, _KEYBUF(sav->key_enc),
|
|
_KEYBITS(sav->key_enc) / 8, 16);
|
|
rc5_cbc_process(m, bodyoff, plen, e_key, iv, RC5_ENCRYPT);
|
|
|
|
/* for safety */
|
|
bzero(e_key, sizeof(e_key));
|
|
}
|
|
|
|
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_second & 0xff;
|
|
|
|
if (!y) y++;
|
|
x = (u_int8_t *)sav->iv;
|
|
for (i = 0; i < sav->ivlen; i++) {
|
|
*x = (*x + y) & 0xff;
|
|
x++;
|
|
}
|
|
}
|
|
|
|
static caddr_t
|
|
mbuf_find_offset(m, off, len)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
size_t len;
|
|
{
|
|
struct mbuf *n;
|
|
size_t cnt;
|
|
|
|
if (m->m_pkthdr.len < off || m->m_pkthdr.len < off + len)
|
|
return (caddr_t)NULL;
|
|
cnt = 0;
|
|
for (n = m; n; n = n->m_next) {
|
|
if (cnt + n->m_len <= off) {
|
|
cnt += n->m_len;
|
|
continue;
|
|
}
|
|
if (cnt <= off && off < cnt + n->m_len
|
|
&& cnt <= off + len && off + len <= cnt + n->m_len) {
|
|
return mtod(n, caddr_t) + off - cnt;
|
|
} else
|
|
return (caddr_t)NULL;
|
|
}
|
|
return (caddr_t)NULL;
|
|
}
|
|
|
|
/*------------------------------------------------------------*/
|
|
|
|
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];
|
|
struct ah_algorithm *algo;
|
|
size_t siz;
|
|
|
|
/* sanity checks */
|
|
if (m0->m_pkthdr.len < skip) {
|
|
printf("esp_auth: mbuf length < skip\n");
|
|
return EINVAL;
|
|
}
|
|
if (m0->m_pkthdr.len < skip + length) {
|
|
printf("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) {
|
|
printf("esp_auth: length is not multiple of 4\n");
|
|
return EINVAL;
|
|
}
|
|
if (!sav) {
|
|
printf("esp_auth: NULL SA passed\n");
|
|
return EINVAL;
|
|
}
|
|
if (!sav->alg_auth) {
|
|
printf("esp_auth: bad ESP auth algorithm passed: %d\n", sav->alg_auth);
|
|
return EINVAL;
|
|
}
|
|
|
|
m = m0;
|
|
off = 0;
|
|
|
|
algo = &ah_algorithms[sav->alg_auth];
|
|
siz = (((*algo->sumsiz)(sav) + 3) & ~(4 - 1));
|
|
if (sizeof(sumbuf) < siz) {
|
|
printf("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;
|
|
}
|
|
}
|
|
|
|
(*algo->init)(&s, sav);
|
|
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;
|
|
}
|