1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* EAP peer method: EAP-MD5 (RFC 3748 and RFC 1994)
* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "eap_i.h"
#include "md5.h"
#include "crypto.h"
static void * eap_md5_init(struct eap_sm *sm)
{
/* No need for private data. However, must return non-NULL to indicate
* success. */
return (void *) 1;
}
static void eap_md5_deinit(struct eap_sm *sm, void *priv)
{
}
static u8 * eap_md5_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
const struct eap_hdr *req;
struct eap_hdr *resp;
const u8 *pos, *challenge, *password;
u8 *rpos;
size_t len, challenge_len, password_len;
const u8 *addr[3];
size_t elen[3];
password = eap_get_config_password(sm, &password_len);
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
eap_sm_request_password(sm);
ret->ignore = TRUE;
return NULL;
}
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5,
reqData, reqDataLen, &len);
if (pos == NULL || len == 0) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame (pos=%p len=%lu)",
pos, (unsigned long) len);
ret->ignore = TRUE;
return NULL;
}
/*
* CHAP Challenge:
* Value-Size (1 octet) | Value(Challenge) | Name(optional)
*/
req = (const struct eap_hdr *) reqData;
challenge_len = *pos++;
if (challenge_len == 0 || challenge_len > len - 1) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid challenge "
"(challenge_len=%lu len=%lu)",
(unsigned long) challenge_len, (unsigned long) len);
ret->ignore = TRUE;
return NULL;
}
ret->ignore = FALSE;
challenge = pos;
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge",
challenge, challenge_len);
wpa_printf(MSG_DEBUG, "EAP-MD5: Generating Challenge Response");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
ret->allowNotifications = TRUE;
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, respDataLen,
1 + MD5_MAC_LEN, EAP_CODE_RESPONSE,
req->identifier, &rpos);
if (resp == NULL)
return NULL;
/*
* CHAP Response:
* Value-Size (1 octet) | Value(Response) | Name(optional)
*/
*rpos++ = MD5_MAC_LEN;
addr[0] = &resp->identifier;
elen[0] = 1;
addr[1] = password;
elen[1] = password_len;
addr[2] = challenge;
elen[2] = challenge_len;
md5_vector(3, addr, elen, rpos);
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", rpos, MD5_MAC_LEN);
return (u8 *) resp;
}
int eap_peer_md5_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5");
if (eap == NULL)
return -1;
eap->init = eap_md5_init;
eap->deinit = eap_md5_deinit;
eap->process = eap_md5_process;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
|
