1 |
|
|
/* $OpenBSD: radius_msgauth.c,v 1.1 2015/07/20 23:52:29 yasuoka Exp $ */ |
2 |
|
|
|
3 |
|
|
/*- |
4 |
|
|
* Copyright (c) 2009 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/hmac.h> |
39 |
|
|
|
40 |
|
|
#include "radius.h" |
41 |
|
|
|
42 |
|
|
#include "radius_local.h" |
43 |
|
|
|
44 |
|
|
static void |
45 |
|
|
radius_calc_message_authenticator(RADIUS_PACKET * packet, const char *secret, |
46 |
|
|
void *ma) |
47 |
|
|
{ |
48 |
|
|
const RADIUS_ATTRIBUTE *attr; |
49 |
|
|
const RADIUS_ATTRIBUTE *end; |
50 |
|
56 |
u_char zero16[16]; |
51 |
|
28 |
HMAC_CTX ctx; |
52 |
|
28 |
int mdlen; |
53 |
|
|
|
54 |
|
28 |
memset(zero16, 0, sizeof(zero16)); |
55 |
|
|
|
56 |
|
28 |
HMAC_Init(&ctx, secret, strlen(secret), EVP_md5()); |
57 |
|
|
|
58 |
|
|
/* |
59 |
|
|
* Traverse the radius packet. |
60 |
|
|
*/ |
61 |
✓✓ |
28 |
if (packet->request != NULL) { |
62 |
|
12 |
HMAC_Update(&ctx, (const u_char *)packet->pdata, 4); |
63 |
|
24 |
HMAC_Update(&ctx, (unsigned char *)packet->request->pdata |
64 |
|
12 |
->authenticator, 16); |
65 |
|
12 |
} else { |
66 |
|
16 |
HMAC_Update(&ctx, (const u_char *)packet->pdata, |
67 |
|
|
sizeof(RADIUS_PACKET_DATA)); |
68 |
|
|
} |
69 |
|
|
|
70 |
|
28 |
attr = ATTRS_BEGIN(packet->pdata); |
71 |
|
28 |
end = ATTRS_END(packet->pdata); |
72 |
|
|
|
73 |
✓✓ |
168 |
for (; attr < end; ATTRS_ADVANCE(attr)) { |
74 |
✓✓ |
56 |
if (attr->type == RADIUS_TYPE_MESSAGE_AUTHENTICATOR) { |
75 |
|
28 |
HMAC_Update(&ctx, (u_char *)attr, 2); |
76 |
|
28 |
HMAC_Update(&ctx, (u_char *)zero16, sizeof(zero16)); |
77 |
|
28 |
} else |
78 |
|
28 |
HMAC_Update(&ctx, (u_char *)attr, (int) attr->length); |
79 |
|
|
} |
80 |
|
|
|
81 |
|
28 |
HMAC_Final(&ctx, (u_char *)ma, &mdlen); |
82 |
|
|
|
83 |
|
28 |
HMAC_cleanup(&ctx); |
84 |
|
28 |
} |
85 |
|
|
|
86 |
|
|
int |
87 |
|
|
radius_put_message_authenticator(RADIUS_PACKET * packet, const char *secret) |
88 |
|
|
{ |
89 |
|
16 |
u_char ma[16]; |
90 |
|
|
|
91 |
|
|
/* |
92 |
|
|
* It is not required to initialize ma |
93 |
|
|
* because content of Message-Authenticator attribute is assumed zero |
94 |
|
|
* during calculation. |
95 |
|
|
*/ |
96 |
✗✓ |
16 |
if (radius_put_raw_attr(packet, RADIUS_TYPE_MESSAGE_AUTHENTICATOR, |
97 |
|
16 |
ma, sizeof(ma)) != 0) |
98 |
|
|
return (-1); |
99 |
|
|
|
100 |
|
8 |
return (radius_set_message_authenticator(packet, secret)); |
101 |
|
8 |
} |
102 |
|
|
|
103 |
|
|
int |
104 |
|
|
radius_set_message_authenticator(RADIUS_PACKET * packet, const char *secret) |
105 |
|
|
{ |
106 |
|
24 |
u_char ma[16]; |
107 |
|
|
|
108 |
|
12 |
radius_calc_message_authenticator(packet, secret, ma); |
109 |
|
|
|
110 |
|
24 |
return (radius_set_raw_attr(packet, RADIUS_TYPE_MESSAGE_AUTHENTICATOR, |
111 |
|
|
ma, sizeof(ma))); |
112 |
|
12 |
} |
113 |
|
|
|
114 |
|
|
int |
115 |
|
|
radius_check_message_authenticator(RADIUS_PACKET * packet, const char *secret) |
116 |
|
|
{ |
117 |
|
|
int rval; |
118 |
|
32 |
size_t len; |
119 |
|
16 |
u_char ma0[16], ma1[16]; |
120 |
|
|
|
121 |
|
16 |
radius_calc_message_authenticator(packet, secret, ma0); |
122 |
|
|
|
123 |
|
16 |
len = sizeof(ma1); |
124 |
✗✓ |
32 |
if ((rval = radius_get_raw_attr(packet, |
125 |
|
32 |
RADIUS_TYPE_MESSAGE_AUTHENTICATOR, ma1, &len)) != 0) |
126 |
|
|
return (rval); |
127 |
|
|
|
128 |
✗✓ |
16 |
if (len != sizeof(ma1)) |
129 |
|
|
return (-1); |
130 |
|
|
|
131 |
|
16 |
return (memcmp(ma0, ma1, sizeof(ma1))); |
132 |
|
16 |
} |