329 lines
7.2 KiB
C
329 lines
7.2 KiB
C
/* $KAME: algorithm.c,v 1.13 2001/01/26 03:26:22 thorpej 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 <sys/param.h>
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#include <sys/types.h>
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#include "var.h"
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#include "misc.h"
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#include "vmbuf.h"
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#include "plog.h"
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#include "debug.h"
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#include "algorithm.h"
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#include "oakley.h"
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#include "isakmp_var.h"
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#include "isakmp.h"
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#include "ipsec_doi.h"
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static const int ipsecenc2doi[] = {
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ALGTYPE_NOTHING,
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IPSECDOI_ESP_DES_IV64,
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IPSECDOI_ESP_DES,
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IPSECDOI_ESP_3DES,
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IPSECDOI_ESP_RC5,
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IPSECDOI_ESP_IDEA,
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IPSECDOI_ESP_CAST,
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IPSECDOI_ESP_BLOWFISH,
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IPSECDOI_ESP_3IDEA,
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IPSECDOI_ESP_DES_IV32,
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IPSECDOI_ESP_RC4,
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IPSECDOI_ESP_NULL,
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IPSECDOI_ESP_RIJNDAEL,
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IPSECDOI_ESP_TWOFISH,
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};
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static const int ipsecauth2doi[] = {
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ALGTYPE_NOTHING,
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IPSECDOI_ATTR_AUTH_HMAC_MD5,
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IPSECDOI_ATTR_AUTH_HMAC_SHA1,
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IPSECDOI_ATTR_AUTH_DES_MAC,
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IPSECDOI_ATTR_AUTH_KPDK,
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IPSECDOI_ATTR_AUTH_NONE,
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};
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static const int ipseccomp2doi[] = {
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ALGTYPE_NOTHING,
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IPSECDOI_IPCOMP_OUI,
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IPSECDOI_IPCOMP_DEFLATE,
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IPSECDOI_IPCOMP_LZS,
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};
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static const int isakmpenc2doi[] = {
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ALGTYPE_NOTHING,
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-1,
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OAKLEY_ATTR_ENC_ALG_DES,
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OAKLEY_ATTR_ENC_ALG_3DES,
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OAKLEY_ATTR_ENC_ALG_RC5,
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OAKLEY_ATTR_ENC_ALG_IDEA,
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OAKLEY_ATTR_ENC_ALG_CAST,
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OAKLEY_ATTR_ENC_ALG_BLOWFISH,
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};
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static const int isakmphash2doi[] = {
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ALGTYPE_NOTHING,
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OAKLEY_ATTR_HASH_ALG_MD5,
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OAKLEY_ATTR_HASH_ALG_SHA,
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OAKLEY_ATTR_HASH_ALG_TIGER,
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};
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static const int isakmpameth2doi[] = {
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ALGTYPE_NOTHING,
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OAKLEY_ATTR_AUTH_METHOD_PSKEY,
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OAKLEY_ATTR_AUTH_METHOD_DSSSIG,
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OAKLEY_ATTR_AUTH_METHOD_RSASIG,
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OAKLEY_ATTR_AUTH_METHOD_RSAENC,
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OAKLEY_ATTR_AUTH_METHOD_RSAREV,
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OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB,
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};
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static const int isakmpdh2doi[] = {
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ALGTYPE_NOTHING,
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OAKLEY_ATTR_GRP_DESC_MODP768,
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OAKLEY_ATTR_GRP_DESC_MODP1024,
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OAKLEY_ATTR_GRP_DESC_EC2N155,
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OAKLEY_ATTR_GRP_DESC_EC2N185,
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OAKLEY_ATTR_GRP_DESC_MODP1536,
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};
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/*
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* give the default key length
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* OUT: -1: NG
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* 0: fixed key cipher, key length not allowed
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* positive: default key length
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*/
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int
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default_keylen(class, type)
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int class, type;
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{
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switch (class) {
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case algclass_isakmp_enc:
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case algclass_ipsec_enc:
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break;
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default:
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return 0;
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}
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switch (type) {
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case algtype_blowfish:
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case algtype_rc5:
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case algtype_cast128:
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case algtype_rijndael:
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case algtype_twofish:
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return 128;
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default:
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return 0;
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}
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}
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/*
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* check key length
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* OUT: -1: NG
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* 0: OK
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*/
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int
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check_keylen(class, type, len)
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int class, type, len;
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{
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int badrange;
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switch (class) {
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case algclass_isakmp_enc:
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case algclass_ipsec_enc:
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break;
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default:
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/* unknown class, punt */
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plog(LLV_ERROR, LOCATION, NULL,
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"unknown algclass %d\n", class);
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return -1;
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}
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/* key length must be multiple of 8 bytes - RFC2451 2.2 */
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switch (type) {
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case algtype_blowfish:
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case algtype_rc5:
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case algtype_cast128:
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case algtype_rijndael:
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case algtype_twofish:
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if (len % 8 != 0) {
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plog(LLV_ERROR, LOCATION, NULL,
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"key length %d is not multiple of 8\n", len);
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return -1;
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}
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break;
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}
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/* key length range */
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badrange = 0;
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switch (type) {
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case algtype_blowfish:
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if (len < 40 || 448 < len)
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badrange++;
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break;
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case algtype_rc5:
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if (len < 40 || 2040 < len)
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badrange++;
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break;
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case algtype_cast128:
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if (len < 40 || 128 < len)
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badrange++;
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break;
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case algtype_rijndael:
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if (!(len == 128 || len == 192 || len == 256))
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badrange++;
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break;
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case algtype_twofish:
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if (len < 40 || 256 < len)
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badrange++;
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break;
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default:
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if (len) {
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plog(LLV_ERROR, LOCATION, NULL,
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"key length is not allowed");
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return -1;
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}
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break;
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}
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if (badrange) {
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plog(LLV_ERROR, LOCATION, NULL,
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"key length out of range\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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/*
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* convert algorithm type to DOI value.
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* OUT -1 : NG
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* other: converted.
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*/
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int
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algtype2doi(class, type)
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int class, type;
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{
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switch (class) {
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case algclass_ipsec_enc:
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if (ARRAYLEN(ipsecenc2doi) > type)
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return ipsecenc2doi[type];
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break;
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case algclass_ipsec_auth:
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if (ARRAYLEN(ipsecauth2doi) > type)
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return ipsecauth2doi[type];
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break;
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case algclass_ipsec_comp:
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if (ARRAYLEN(ipseccomp2doi) > type)
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return ipseccomp2doi[type];
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break;
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case algclass_isakmp_enc:
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if (ARRAYLEN(isakmpenc2doi) > type)
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return isakmpenc2doi[type];
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break;
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case algclass_isakmp_hash:
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if (ARRAYLEN(isakmphash2doi) > type)
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return isakmphash2doi[type];
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break;
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case algclass_isakmp_dh:
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if (ARRAYLEN(isakmpdh2doi) > type)
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return isakmpdh2doi[type];
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break;
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case algclass_isakmp_ameth:
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if (ARRAYLEN(isakmpameth2doi) > type)
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return isakmpameth2doi[type];
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break;
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}
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return -1;
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}
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/*
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* convert algorithm class to DOI value.
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* OUT -1 : NG
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* other: converted.
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*/
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int
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algclass2doi(class)
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int class;
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{
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switch (class) {
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case algclass_ipsec_enc:
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return IPSECDOI_PROTO_IPSEC_ESP;
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case algclass_ipsec_auth:
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return IPSECDOI_ATTR_AUTH;
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case algclass_ipsec_comp:
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return IPSECDOI_PROTO_IPCOMP;
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case algclass_isakmp_enc:
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return OAKLEY_ATTR_ENC_ALG;
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case algclass_isakmp_hash:
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return OAKLEY_ATTR_HASH_ALG;
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case algclass_isakmp_dh:
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return OAKLEY_ATTR_GRP_DESC;
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case algclass_isakmp_ameth:
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return OAKLEY_ATTR_AUTH_METHOD;
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default:
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return -1;
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}
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/*NOTREACHED*/
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return -1;
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}
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struct algorithm_strength **
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initalgstrength()
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{
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struct algorithm_strength **new;
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int i;
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new = CALLOC(MAXALGCLASS * sizeof(*new), struct algorithm_strength **);
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if (new == NULL) {
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plog(LLV_ERROR, LOCATION, NULL,
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"failed to get buffer.\n");
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return NULL;
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}
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for (i = 0; i < MAXALGCLASS; i++) {
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new[i] = CALLOC(sizeof(*new[i]), struct algorithm_strength *);
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if (new[i] == NULL) {
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plog(LLV_ERROR, LOCATION, NULL,
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"failed to get buffer.\n");
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return NULL;
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}
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}
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return new;
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}
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void
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flushalgstrength(head)
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struct algorithm_strength **head;
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{
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int i;
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for (i = 0; i < MAXALGCLASS; i++)
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if (head[i])
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free(head[i]);
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free(head);
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}
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