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/* $OpenBSD: radius_eapmsk.c,v 1.1 2015/07/20 23:52:29 yasuoka Exp $ */ |
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/*- |
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* Copyright (c) 2013 Internet Initiative Japan Inc. |
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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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* |
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* THIS SOFTWARE IS PROVIDED BY THE"AUTHOR" 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 AUTHOR 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/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <stdbool.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <openssl/md5.h> |
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#include "radius.h" |
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#include "radius_local.h" |
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int |
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radius_get_eap_msk(const RADIUS_PACKET * packet, void *buf, size_t * len, |
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const char *secret) |
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{ |
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/* |
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* Unfortunately, the way to pass EAP MSK/EMSK over RADIUS |
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* is not standardized. |
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*/ |
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uint8_t buf0[256]; |
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uint8_t buf1[256]; |
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size_t len0, len1; |
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/* |
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* EAP MSK via MPPE keys |
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* |
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* MSK = MPPE-Recv-Key + MPPE-Send-Key + 32byte zeros |
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* http://msdn.microsoft.com/en-us/library/cc224635.aspx |
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*/ |
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len0 = sizeof(buf0); |
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len1 = sizeof(buf1); |
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if (radius_get_mppe_recv_key_attr(packet, buf0, &len0, secret) == 0 && |
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radius_get_mppe_send_key_attr(packet, buf1, &len1, secret) == 0) { |
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if (len0 < 16 || len1 < 16) |
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return (-1); |
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if (*len < 64) |
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return (-1); |
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memcpy(buf, buf0, 16); |
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memcpy(((char *)buf) + 16, buf1, 16); |
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memset(((char *)buf) + 32, 0, 32); |
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*len = 64; |
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return (0); |
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} |
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return (-1); |
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} |