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/*
 * Copyright (c) 2001-2002 Packet Design, LLC.
 * All rights reserved.
 * 
 * Subject to the following obligations and disclaimer of warranty,
 * use and redistribution of this software, in source or object code
 * forms, with or without modifications are expressly permitted by
 * Packet Design; provided, however, that:
 * 
 *    (i)  Any and all reproductions of the source or object code
 *         must include the copyright notice above and the following
 *         disclaimer of warranties; and
 *    (ii) No rights are granted, in any manner or form, to use
 *         Packet Design trademarks, including the mark "PACKET DESIGN"
 *         on advertising, endorsements, or otherwise except as such
 *         appears in the above copyright notice or in the software.
 * 
 * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
 * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
 * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
 * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
 * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
 * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
 * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
 * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
 * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
 * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Archie Cobbs <archie@freebsd.org>
 */

#include "ppp/ppp_defs.h"
#include "ppp/ppp_log.h"
#include "ppp/ppp_util.h"
#include "ppp/ppp_fsm_option.h"
#include "ppp/ppp_auth.h"
#include "ppp/ppp_auth_chap.h"

#include <openssl/md5.h>

#define CHAP_MD5_CHALLENGE_LEN	16

static ppp_auth_chap_set_id_t	ppp_auth_chap_md5_set_id;
static ppp_auth_chap_hash_t	ppp_auth_chap_md5_hash;
static ppp_auth_chap_equal_t	ppp_auth_chap_md5_equal;
static ppp_auth_chap_final_t	ppp_auth_chap_md5_final;

const struct ppp_auth_chap_type ppp_auth_chap_md5 = {
	ppp_auth_chap_md5_set_id,
	ppp_auth_chap_md5_hash,
	ppp_auth_chap_md5_equal,
	ppp_auth_chap_md5_final,
	0,
	CHAP_MD5_CHALLENGE_LEN,
	offsetof(struct ppp_auth_cred_chap_md5, hash),
	MD5_DIGEST_LENGTH
};

static void
ppp_auth_chap_md5_set_id(struct ppp_auth_cred_chap *cred, u_char id)
{
	cred->u.md5.id = id;
}

static void
ppp_auth_chap_md5_hash(struct ppp_auth_cred_chap *chap,
	const void *secret, size_t slen)
{
	struct ppp_auth_cred_chap_md5 *const md5 = &chap->u.md5;
	MD5_CTX ctx;

	MD5_Init(&ctx);
	MD5_Update(&ctx, &md5->id, 1);
	MD5_Update(&ctx, secret, slen);
	MD5_Update(&ctx, &chap->chal_data, chap->chal_len);
	MD5_Final(md5->hash, &ctx);
}

static int
ppp_auth_chap_md5_equal(struct ppp_auth_cred_chap *chap1,
	struct ppp_auth_cred_chap *chap2)
{
	struct ppp_auth_cred_chap_md5 *const md5_1 = &chap1->u.md5;
	struct ppp_auth_cred_chap_md5 *const md5_2 = &chap2->u.md5;

	return (memcmp(md5_1->hash, md5_2->hash, MD5_DIGEST_LENGTH) == 0);
}

static int
ppp_auth_chap_md5_final(struct ppp_auth_cred_chap *cred, struct ppp_log *log,
	int valid, const u_char *payload, size_t len, const u_char *authresp)
{
	char buf[256];

	/* Display message */
	ppp_util_ascify(buf, sizeof(buf), payload, len);
	ppp_log_put(log, LOG_INFO, "message: %s", buf);
	return (0);
}