GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/isakmpd/cookie.c Lines: 0 14 0.0 %
Date: 2017-11-13 Branches: 0 2 0.0 %

Line Branch Exec Source
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/* $OpenBSD: cookie.c,v 1.17 2017/02/03 08:23:46 guenther Exp $	 */
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/* $EOM: cookie.c,v 1.21 1999/08/05 15:00:04 niklas Exp $	 */
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/*
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 * Copyright (c) 1998, 1999 Niklas Hallqvist.  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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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/*
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 * This code was written under funding by Ericsson Radio Systems.
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 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cookie.h"
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#include "exchange.h"
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#include "hash.h"
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#include "transport.h"
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#include "util.h"
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#define COOKIE_SECRET_SIZE	16
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/*
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 * Generate an anti-clogging token (a protection against an attacker forcing
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 * us to keep state for a flood of connection requests) a.k.a. a cookie
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 * at BUF, LEN bytes long.  The cookie will be generated by hashing of
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 * information found, among otherplaces, in transport T and exchange
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 * EXCHANGE.
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 */
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void
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cookie_gen(struct transport *t, struct exchange *exchange, u_int8_t *buf,
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    size_t len)
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{
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	struct hash    *hash = hash_get(HASH_SHA1);
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	u_int8_t        tmpsecret[COOKIE_SECRET_SIZE];
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	struct sockaddr *name;
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	hash->Init(hash->ctx);
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	(*t->vtbl->get_dst)(t, &name);
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	hash->Update(hash->ctx, (u_int8_t *)name, SA_LEN(name));
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	(*t->vtbl->get_src)(t, &name);
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	hash->Update(hash->ctx, (u_int8_t *)name, SA_LEN(name));
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	if (exchange->initiator == 0)
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		hash->Update(hash->ctx, exchange->cookies +
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		    ISAKMP_HDR_ICOOKIE_OFF, ISAKMP_HDR_ICOOKIE_LEN);
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	arc4random_buf(tmpsecret, COOKIE_SECRET_SIZE);
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	hash->Update(hash->ctx, tmpsecret, COOKIE_SECRET_SIZE);
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	hash->Final(hash->digest, hash->ctx);
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	memcpy(buf, hash->digest, len);
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}