summaryrefslogtreecommitdiff
path: root/src/libcharon/sa/authenticators/authenticator.h
blob: fff91ed34975b570a5148abcbae8ed3c3f56b80b (plain)
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
 * Copyright (C) 2005-2009 Martin Willi
 * Copyright (C) 2008 Tobias Brunner
 * 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.
 */

/**
 * @defgroup authenticator authenticator
 * @{ @ingroup authenticators
 */

#ifndef AUTHENTICATOR_H_
#define AUTHENTICATOR_H_

typedef enum auth_method_t auth_method_t;
typedef enum auth_class_t auth_class_t;
typedef struct authenticator_t authenticator_t;

#include <library.h>
#include <config/auth_cfg.h>
#include <sa/ike_sa.h>

/**
 * Method to use for authentication, as defined in IKEv2.
 */
enum auth_method_t {
	/**
	 * Computed as specified in section 2.15 of RFC using
	 * an RSA private key over a PKCS#1 padded hash.
	 */
	AUTH_RSA = 1,

	/**
	 * Computed as specified in section 2.15 of RFC using the
	 * shared key associated with the identity in the ID payload
	 * and the negotiated prf function
	 */
	AUTH_PSK = 2,

	/**
	 * Computed as specified in section 2.15 of RFC using a
	 * DSS private key over a SHA-1 hash.
	 */
	AUTH_DSS = 3,

	/**
	 * ECDSA with SHA-256 on the P-256 curve as specified in RFC 4754
	 */
	AUTH_ECDSA_256 = 9,

	/**
	 * ECDSA with SHA-384 on the P-384 curve as specified in RFC 4754
	 */
	AUTH_ECDSA_384 = 10,

	/**
	 * ECDSA with SHA-512 on the P-521 curve as specified in RFC 4754
	 */
	AUTH_ECDSA_521 = 11,
};

/**
 * enum names for auth_method_t.
 */
extern enum_name_t *auth_method_names;

/**
 * Class of authentication to use. This is different to auth_method_t in that
 * it does not specify a method, but a class of acceptable methods. The found
 * certificate finally dictates wich method is used.
 */
enum auth_class_t {
	/** any class acceptable */
	AUTH_CLASS_ANY = 0,
	/** authentication using public keys (RSA, ECDSA) */
	AUTH_CLASS_PUBKEY = 1,
	/** authentication using a pre-shared secrets */
	AUTH_CLASS_PSK = 2,
	/** authentication using EAP */
	AUTH_CLASS_EAP = 3,
};

/**
 * enum strings for auth_class_t
 */
extern enum_name_t *auth_class_names;

/**
 * Authenticator interface implemented by the various authenticators.
 *
 * An authenticator implementation handles AUTH and EAP payloads. Received
 * messages are passed to the process() method, to send authentication data
 * the message is passed to the build() method.
 */
struct authenticator_t {

	/**
	 * Process an incoming message using the authenticator.
	 *
	 * @param message		message containing authentication payloads
	 * @return
	 *						- SUCCESS if authentication successful
	 *						- FAILED if authentication failed
	 *						- NEED_MORE if another exchange required
	 */
	status_t (*process)(authenticator_t *this, message_t *message);

	/**
	 * Attach authentication data to an outgoing message.
	 *
	 * @param message		message to add authentication data to
	 * @return
	 *						- SUCCESS if authentication successful
	 *						- FAILED if authentication failed
	 *						- NEED_MORE if another exchange required
	 */
	status_t (*build)(authenticator_t *this, message_t *message);

	/**
	 * Check if the authenticator is capable of mutual authentication.
	 *
	 * Some authenticator authenticate both peers, e.g. EAP. To support
	 * mutual authentication with only a single authenticator (EAP-only
	 * authentication), it must be mutual. This method is invoked in ike_auth
	 * to check if the given authenticator is capable of doing so.
	 */
	bool (*is_mutual)(authenticator_t *this);

	/**
	 * Destroy authenticator instance.
	 */
	void (*destroy) (authenticator_t *this);
};

/**
 * Create an authenticator to build signatures.
 *
 * @param ike_sa			associated ike_sa
 * @param cfg				authentication configuration
 * @param received_nonce	nonce received in IKE_SA_INIT
 * @param sent_nonce		nonce sent in IKE_SA_INIT
 * @param received_init		received IKE_SA_INIT message data
 * @param sent_init			sent IKE_SA_INIT message data
 * @return					authenticator, NULL if not supported
 */
authenticator_t *authenticator_create_builder(
									ike_sa_t *ike_sa, auth_cfg_t *cfg,
									chunk_t received_nonce, chunk_t sent_nonce,
									chunk_t received_init, chunk_t sent_init);

/**
 * Create an authenticator to verify signatures.
 *
 * @param ike_sa			associated ike_sa
 * @param message			message containing authentication data
 * @param received_nonce	nonce received in IKE_SA_INIT
 * @param sent_nonce		nonce sent in IKE_SA_INIT
 * @param received_init		received IKE_SA_INIT message data
 * @param sent_init			sent IKE_SA_INIT message data
 * @return					authenticator, NULL if not supported
 */
authenticator_t *authenticator_create_verifier(
									ike_sa_t *ike_sa, message_t *message,
									chunk_t received_nonce, chunk_t sent_nonce,
									chunk_t received_init, chunk_t sent_init);

#endif /** AUTHENTICATOR_H_ @}*/