1 /* $OpenBSD: radius_eapmsk.c,v 1.3 2024/02/09 11:59:23 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 <stdint.h>
30 #include <string.h>
31
32 #include "radius.h"
33
34 #include "radius_local.h"
35
36 int
radius_get_eap_msk(const RADIUS_PACKET * packet,void * buf,size_t * len,const char * secret)37 radius_get_eap_msk(const RADIUS_PACKET * packet, void *buf, size_t *len,
38 const char *secret)
39 {
40 uint8_t buf0[256];
41 uint8_t buf1[256];
42 size_t len0, len1, msklen;
43
44 /* RFC 3748 defines the MSK minimum size is 64 bytes */
45 if (*len < 64)
46 return (-1);
47 len0 = sizeof(buf0);
48 len1 = sizeof(buf1);
49 if (radius_get_mppe_recv_key_attr(packet, buf0, &len0, secret) == 0 &&
50 radius_get_mppe_send_key_attr(packet, buf1, &len1, secret) == 0) {
51 /* addition cannot overflow since len{0,1} are limited to 256 */
52 msklen = len0 + len1;
53 if (msklen > *len)
54 return (-1); /* not enougth */
55 memcpy(buf, buf0, len0);
56 memcpy(((char *)buf) + len0, buf1, len1);
57 /* zero padding to the minimum size, 64 bytes. */
58 if (msklen < 64) {
59 memset(((char *)buf) + msklen, 0, 64 - msklen);
60 msklen = 64;
61 }
62 *len = msklen;
63 return (0);
64 }
65
66 return (-1);
67 }
68