eap_tls_common.h revision 1f69aa52ea2e0a73ac502565df8c666ee49cab6a 
1/*
2 * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#ifndef EAP_TLS_COMMON_H
16#define EAP_TLS_COMMON_H
17
18/**
19 * struct eap_ssl_data - TLS data for EAP methods
20 */
21struct eap_ssl_data {
22	/**
23	 * conn - TLS connection context data from tls_connection_init()
24	 */
25	struct tls_connection *conn;
26
27	/**
28	 * tls_out - TLS message to be sent out in fragments
29	 */
30	struct wpabuf *tls_out;
31
32	/**
33	 * tls_out_pos - The current position in the outgoing TLS message
34	 */
35	size_t tls_out_pos;
36
37	/**
38	 * tls_out_limit - Maximum fragment size for outgoing TLS messages
39	 */
40	size_t tls_out_limit;
41
42	/**
43	 * tls_in - Received TLS message buffer for re-assembly
44	 */
45	struct wpabuf *tls_in;
46
47	/**
48	 * tls_in_left - Number of remaining bytes in the incoming TLS message
49	 */
50	size_t tls_in_left;
51
52	/**
53	 * tls_in_total - Total number of bytes in the incoming TLS message
54	 */
55	size_t tls_in_total;
56
57	/**
58	 * phase2 - Whether this TLS connection is used in EAP phase 2 (tunnel)
59	 */
60	int phase2;
61
62	/**
63	 * include_tls_length - Whether the TLS length field is included even
64	 * if the TLS data is not fragmented
65	 */
66	int include_tls_length;
67
68	/**
69	 * eap - EAP state machine allocated with eap_peer_sm_init()
70	 */
71	struct eap_sm *eap;
72};
73
74
75/* EAP TLS Flags */
76#define EAP_TLS_FLAGS_LENGTH_INCLUDED 0x80
77#define EAP_TLS_FLAGS_MORE_FRAGMENTS 0x40
78#define EAP_TLS_FLAGS_START 0x20
79#define EAP_TLS_VERSION_MASK 0x07
80
81 /* could be up to 128 bytes, but only the first 64 bytes are used */
82#define EAP_TLS_KEY_LEN 64
83
84
85int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
86			  struct eap_peer_config *config);
87void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data);
88u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
89			     const char *label, size_t len);
90int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
91				EapType eap_type, int peap_version,
92				u8 id, const u8 *in_data, size_t in_len,
93				struct wpabuf **out_data);
94struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
95				       int peap_version);
96int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data);
97int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
98			char *buf, size_t buflen, int verbose);
99const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
100				     struct eap_ssl_data *data,
101				     EapType eap_type,
102				     struct eap_method_ret *ret,
103				     const struct wpabuf *reqData,
104				     size_t *len, u8 *flags);
105void eap_peer_tls_reset_input(struct eap_ssl_data *data);
106void eap_peer_tls_reset_output(struct eap_ssl_data *data);
107int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
108			 const struct wpabuf *in_data,
109			 struct wpabuf **in_decrypted);
110int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
111			 EapType eap_type, int peap_version, u8 id,
112			 const struct wpabuf *in_data,
113			 struct wpabuf **out_data);
114int eap_peer_select_phase2_methods(struct eap_peer_config *config,
115				   const char *prefix,
116				   struct eap_method_type **types,
117				   size_t *num_types);
118int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
119			    struct eap_hdr *hdr, struct wpabuf **resp);
120
121#endif /* EAP_TLS_COMMON_H */
122