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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Copyright (C) 2005-2008 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* $Id$
*/
#include <string.h>
#include "psk_authenticator.h"
#include <daemon.h>
#include <credentials/auth_info.h>
typedef struct private_psk_authenticator_t private_psk_authenticator_t;
/**
* Private data of an psk_authenticator_t object.
*/
struct private_psk_authenticator_t {
/**
* Public authenticator_t interface.
*/
psk_authenticator_t public;
/**
* Assigned IKE_SA
*/
ike_sa_t *ike_sa;
};
/**
* Implementation of authenticator_t.verify.
*/
static status_t verify(private_psk_authenticator_t *this, chunk_t ike_sa_init,
chunk_t my_nonce, auth_payload_t *auth_payload)
{
chunk_t auth_data, recv_auth_data;
identification_t *my_id, *other_id;
shared_key_t *key;
enumerator_t *enumerator;
bool authenticated = FALSE;
int keys_found = 0;
keymat_t *keymat;
keymat = this->ike_sa->get_keymat(this->ike_sa);
recv_auth_data = auth_payload->get_data(auth_payload);
my_id = this->ike_sa->get_my_id(this->ike_sa);
other_id = this->ike_sa->get_other_id(this->ike_sa);
enumerator = charon->credentials->create_shared_enumerator(
charon->credentials, SHARED_IKE, my_id, other_id);
while (!authenticated && enumerator->enumerate(enumerator, &key, NULL, NULL))
{
keys_found++;
auth_data = keymat->get_psk_sig(keymat, TRUE, ike_sa_init, my_nonce,
key->get_key(key), other_id);
if (auth_data.len && chunk_equals(auth_data, recv_auth_data))
{
DBG1(DBG_IKE, "authentication of '%D' with %N successful",
other_id, auth_method_names, AUTH_PSK);
authenticated = TRUE;
}
chunk_free(&auth_data);
}
enumerator->destroy(enumerator);
if (!authenticated)
{
if (keys_found == 0)
{
DBG1(DBG_IKE, "no shared key found for '%D' - '%D'", my_id, other_id);
return NOT_FOUND;
}
DBG1(DBG_IKE, "tried %d shared key%s for '%D' - '%D', but MAC mismatched",
keys_found, keys_found == 1 ? "" : "s", my_id, other_id);
return FAILED;
}
return SUCCESS;
}
/**
* Implementation of authenticator_t.build.
*/
static status_t build(private_psk_authenticator_t *this, chunk_t ike_sa_init,
chunk_t other_nonce, auth_payload_t **auth_payload)
{
identification_t *my_id, *other_id;
shared_key_t *key;
chunk_t auth_data;
keymat_t *keymat;
keymat = this->ike_sa->get_keymat(this->ike_sa);
my_id = this->ike_sa->get_my_id(this->ike_sa);
other_id = this->ike_sa->get_other_id(this->ike_sa);
DBG1(DBG_IKE, "authentication of '%D' (myself) with %N",
my_id, auth_method_names, AUTH_PSK);
key = charon->credentials->get_shared(charon->credentials, SHARED_IKE,
my_id, other_id);
if (key == NULL)
{
DBG1(DBG_IKE, "no shared key found for '%D' - '%D'", my_id, other_id);
return NOT_FOUND;
}
auth_data = keymat->get_psk_sig(keymat, FALSE, ike_sa_init, other_nonce,
key->get_key(key), my_id);
key->destroy(key);
DBG2(DBG_IKE, "successfully created shared key MAC");
*auth_payload = auth_payload_create();
(*auth_payload)->set_auth_method(*auth_payload, AUTH_PSK);
(*auth_payload)->set_data(*auth_payload, auth_data);
chunk_free(&auth_data);
return SUCCESS;
}
/**
* Implementation of authenticator_t.destroy.
*/
static void destroy(private_psk_authenticator_t *this)
{
free(this);
}
/*
* Described in header.
*/
psk_authenticator_t *psk_authenticator_create(ike_sa_t *ike_sa)
{
private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
/* public functions */
this->public.authenticator_interface.verify = (status_t(*)(authenticator_t*,chunk_t,chunk_t,auth_payload_t*))verify;
this->public.authenticator_interface.build = (status_t(*)(authenticator_t*,chunk_t,chunk_t,auth_payload_t**))build;
this->public.authenticator_interface.destroy = (void(*)(authenticator_t*))destroy;
/* private data */
this->ike_sa = ike_sa;
return &this->public;
}
|
