1 /* $OpenBSD: radius_eapmsk.c,v 1.1 2015/07/20 23:52:29 yasuoka Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 Internet Initiative Japan Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE"AUTHOR" AND CONTRIBUTORS AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/socket.h> 31 #include <netinet/in.h> 32 33 #include <stdbool.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 38 #include <openssl/md5.h> 39 40 #include "radius.h" 41 42 #include "radius_local.h" 43 44 int 45 radius_get_eap_msk(const RADIUS_PACKET * packet, void *buf, size_t * len, 46 const char *secret) 47 { 48 /* 49 * Unfortunately, the way to pass EAP MSK/EMSK over RADIUS 50 * is not standardized. 51 */ 52 uint8_t buf0[256]; 53 uint8_t buf1[256]; 54 size_t len0, len1; 55 56 /* 57 * EAP MSK via MPPE keys 58 * 59 * MSK = MPPE-Recv-Key + MPPE-Send-Key + 32byte zeros 60 * http://msdn.microsoft.com/en-us/library/cc224635.aspx 61 */ 62 len0 = sizeof(buf0); 63 len1 = sizeof(buf1); 64 if (radius_get_mppe_recv_key_attr(packet, buf0, &len0, secret) == 0 && 65 radius_get_mppe_send_key_attr(packet, buf1, &len1, secret) == 0) { 66 if (len0 < 16 || len1 < 16) 67 return (-1); 68 if (*len < 64) 69 return (-1); 70 memcpy(buf, buf0, 16); 71 memcpy(((char *)buf) + 16, buf1, 16); 72 memset(((char *)buf) + 32, 0, 32); 73 *len = 64; 74 return (0); 75 } 76 77 return (-1); 78 } 79