aboutsummaryrefslogtreecommitdiffstats
path: root/src/eap_server/eap_i.h
blob: 3b3e49c64306d484d6bd5472064d1321d6874949 (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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*
 * hostapd / EAP Authenticator state machine internal structures (RFC 4137)
 * Copyright (c) 2004-2007, 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.
 */

#ifndef EAP_I_H
#define EAP_I_H

#include "wpabuf.h"
#include "eap_server/eap.h"
#include "eap_common/eap_common.h"

/* RFC 4137 - EAP Standalone Authenticator */

/**
 * struct eap_method - EAP method interface
 * This structure defines the EAP method interface. Each method will need to
 * register its own EAP type, EAP name, and set of function pointers for method
 * specific operations. This interface is based on section 5.4 of RFC 4137.
 */
struct eap_method {
	int vendor;
	EapType method;
	const char *name;

	void * (*init)(struct eap_sm *sm);
	void * (*initPickUp)(struct eap_sm *sm);
	void (*reset)(struct eap_sm *sm, void *priv);

	struct wpabuf * (*buildReq)(struct eap_sm *sm, void *priv, u8 id);
	int (*getTimeout)(struct eap_sm *sm, void *priv);
	Boolean (*check)(struct eap_sm *sm, void *priv,
			 struct wpabuf *respData);
	void (*process)(struct eap_sm *sm, void *priv,
			struct wpabuf *respData);
	Boolean (*isDone)(struct eap_sm *sm, void *priv);
	u8 * (*getKey)(struct eap_sm *sm, void *priv, size_t *len);
	/* isSuccess is not specified in draft-ietf-eap-statemachine-05.txt,
	 * but it is useful in implementing Policy.getDecision() */
	Boolean (*isSuccess)(struct eap_sm *sm, void *priv);

	/**
	 * free - Free EAP method data
	 * @method: Pointer to the method data registered with
	 * eap_server_method_register().
	 *
	 * This function will be called when the EAP method is being
	 * unregistered. If the EAP method allocated resources during
	 * registration (e.g., allocated struct eap_method), they should be
	 * freed in this function. No other method functions will be called
	 * after this call. If this function is not defined (i.e., function
	 * pointer is %NULL), a default handler is used to release the method
	 * data with free(method). This is suitable for most cases.
	 */
	void (*free)(struct eap_method *method);

#define EAP_SERVER_METHOD_INTERFACE_VERSION 1
	/**
	 * version - Version of the EAP server method interface
	 *
	 * The EAP server method implementation should set this variable to
	 * EAP_SERVER_METHOD_INTERFACE_VERSION. This is used to verify that the
	 * EAP method is using supported API version when using dynamically
	 * loadable EAP methods.
	 */
	int version;

	/**
	 * next - Pointer to the next EAP method
	 *
	 * This variable is used internally in the EAP method registration code
	 * to create a linked list of registered EAP methods.
	 */
	struct eap_method *next;

	/**
	 * get_emsk - Get EAP method specific keying extended material (EMSK)
	 * @sm: Pointer to EAP state machine allocated with eap_sm_init()
	 * @priv: Pointer to private EAP method data from eap_method::init()
	 * @len: Pointer to a variable to store EMSK length
	 * Returns: EMSK or %NULL if not available
	 *
	 * This function can be used to get the extended keying material from
	 * the EAP method. The key may already be stored in the method-specific
	 * private data or this function may derive the key.
	 */
	u8 * (*get_emsk)(struct eap_sm *sm, void *priv, size_t *len);
};

/**
 * struct eap_sm - EAP server state machine data
 */
struct eap_sm {
	enum {
		EAP_DISABLED, EAP_INITIALIZE, EAP_IDLE, EAP_RECEIVED,
		EAP_INTEGRITY_CHECK, EAP_METHOD_RESPONSE, EAP_METHOD_REQUEST,
		EAP_PROPOSE_METHOD, EAP_SELECT_ACTION, EAP_SEND_REQUEST,
		EAP_DISCARD, EAP_NAK, EAP_RETRANSMIT, EAP_SUCCESS, EAP_FAILURE,
		EAP_TIMEOUT_FAILURE, EAP_PICK_UP_METHOD,
		EAP_INITIALIZE_PASSTHROUGH, EAP_IDLE2, EAP_RETRANSMIT2,
		EAP_RECEIVED2, EAP_DISCARD2, EAP_SEND_REQUEST2,
		EAP_AAA_REQUEST, EAP_AAA_RESPONSE, EAP_AAA_IDLE,
		EAP_TIMEOUT_FAILURE2, EAP_FAILURE2, EAP_SUCCESS2
	} EAP_state;

	/* Constants */
	int MaxRetrans;

	struct eap_eapol_interface eap_if;

	/* Full authenticator state machine local variables */

	/* Long-term (maintained betwen packets) */
	EapType currentMethod;
	int currentId;
	enum {
		METHOD_PROPOSED, METHOD_CONTINUE, METHOD_END
	} methodState;
	int retransCount;
	struct wpabuf *lastReqData;
	int methodTimeout;

	/* Short-term (not maintained between packets) */
	Boolean rxResp;
	int respId;
	EapType respMethod;
	int respVendor;
	u32 respVendorMethod;
	Boolean ignore;
	enum {
		DECISION_SUCCESS, DECISION_FAILURE, DECISION_CONTINUE,
		DECISION_PASSTHROUGH
	} decision;

	/* Miscellaneous variables */
	const struct eap_method *m; /* selected EAP method */
	/* not defined in RFC 4137 */
	Boolean changed;
	void *eapol_ctx, *msg_ctx;
	struct eapol_callbacks *eapol_cb;
	void *eap_method_priv;
	u8 *identity;
	size_t identity_len;
	/* Whether Phase 2 method should validate identity match */
	int require_identity_match;
	int lastId; /* Identifier used in the last EAP-Packet */
	struct eap_user *user;
	int user_eap_method_index;
	int init_phase2;
	void *ssl_ctx;
	void *eap_sim_db_priv;
	Boolean backend_auth;
	Boolean update_user;
	int eap_server;

	int num_rounds;
	enum {
		METHOD_PENDING_NONE, METHOD_PENDING_WAIT, METHOD_PENDING_CONT
	} method_pending;

	u8 *auth_challenge;
	u8 *peer_challenge;

	u8 *pac_opaque_encr_key;
	u8 *eap_fast_a_id;
	size_t eap_fast_a_id_len;
	char *eap_fast_a_id_info;
	enum {
		NO_PROV, ANON_PROV, AUTH_PROV, BOTH_PROV
	} eap_fast_prov;
	int pac_key_lifetime;
	int pac_key_refresh_time;
	int eap_sim_aka_result_ind;
	int tnc;
	struct wps_context *wps;
	struct wpabuf *assoc_wps_ie;
	struct wpabuf *assoc_p2p_ie;

	Boolean start_reauth;

	u8 peer_addr[ETH_ALEN];

	/* Fragmentation size for EAP method init() handler */
	int fragment_size;
};

int eap_user_get(struct eap_sm *sm, const u8 *identity, size_t identity_len,
		 int phase2);
void eap_sm_process_nak(struct eap_sm *sm, const u8 *nak_list, size_t len);

#endif /* EAP_I_H */