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/* $OpenBSD: radius_eapmsk.c,v 1.1 2015/07/20 23:52:29 yasuoka Exp $ */
/*-
* Copyright (c) 2013 Internet Initiative Japan Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE"AUTHOR" AND CONTRIBUTORS AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/md5.h>
#include "radius.h"
#include "radius_local.h"
int
radius_get_eap_msk(const RADIUS_PACKET * packet, void *buf, size_t * len,
const char *secret)
{
/*
* Unfortunately, the way to pass EAP MSK/EMSK over RADIUS
* is not standardized.
*/
uint8_t buf0[256];
uint8_t buf1[256];
size_t len0, len1;
/*
* EAP MSK via MPPE keys
*
* MSK = MPPE-Recv-Key + MPPE-Send-Key + 32byte zeros
* http://msdn.microsoft.com/en-us/library/cc224635.aspx
*/
len0 = sizeof(buf0);
len1 = sizeof(buf1);
if (radius_get_mppe_recv_key_attr(packet, buf0, &len0, secret) == 0 &&
radius_get_mppe_send_key_attr(packet, buf1, &len1, secret) == 0) {
if (len0 < 16 || len1 < 16)
return (-1);
if (*len < 64)
return (-1);
memcpy(buf, buf0, 16);
memcpy(((char *)buf) + 16, buf1, 16);
memset(((char *)buf) + 32, 0, 32);
*len = 64;
return (0);
}
return (-1);
}
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