eap_fast_common.h revision c5ec7f57ead87efa365800228aa0b09a12d9e6c4 
1/*
2 * EAP-FAST definitions (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#ifndef EAP_FAST_H
10#define EAP_FAST_H
11
12#define EAP_FAST_VERSION 1
13#define EAP_FAST_KEY_LEN 64
14#define EAP_FAST_SIMCK_LEN 40
15#define EAP_FAST_SKS_LEN 40
16#define EAP_FAST_CMK_LEN 20
17
18#define TLS_EXT_PAC_OPAQUE 35
19
20/*
21 * RFC 5422: Section 4.2.1 - Formats for PAC TLV Attributes / Type Field
22 * Note: bit 0x8000 (Mandatory) and bit 0x4000 (Reserved) are also defined
23 * in the general PAC TLV format (Section 4.2).
24 */
25#define PAC_TYPE_PAC_KEY 1
26#define PAC_TYPE_PAC_OPAQUE 2
27#define PAC_TYPE_CRED_LIFETIME 3
28#define PAC_TYPE_A_ID 4
29#define PAC_TYPE_I_ID 5
30/*
31 * 6 was previous assigned for SERVER_PROTECTED_DATA, but
32 * draft-cam-winget-eap-fast-provisioning-02.txt changed this to Reserved.
33 */
34#define PAC_TYPE_A_ID_INFO 7
35#define PAC_TYPE_PAC_ACKNOWLEDGEMENT 8
36#define PAC_TYPE_PAC_INFO 9
37#define PAC_TYPE_PAC_TYPE 10
38
39#ifdef _MSC_VER
40#pragma pack(push, 1)
41#endif /* _MSC_VER */
42
43struct pac_tlv_hdr {
44	be16 type;
45	be16 len;
46} STRUCT_PACKED;
47
48#ifdef _MSC_VER
49#pragma pack(pop)
50#endif /* _MSC_VER */
51
52
53#define EAP_FAST_PAC_KEY_LEN 32
54
55/* RFC 5422: 4.2.6 PAC-Type TLV */
56#define PAC_TYPE_TUNNEL_PAC 1
57/* Application Specific Short Lived PACs (only in volatile storage) */
58/* User Authorization PAC */
59#define PAC_TYPE_USER_AUTHORIZATION 3
60/* Application Specific Long Lived PACs */
61/* Machine Authentication PAC */
62#define PAC_TYPE_MACHINE_AUTHENTICATION 2
63
64
65/*
66 * RFC 5422:
67 * Section 3.3 - Key Derivations Used in the EAP-FAST Provisioning Exchange
68 */
69struct eap_fast_key_block_provisioning {
70	/* Extra key material after TLS key_block */
71	u8 session_key_seed[EAP_FAST_SKS_LEN];
72	u8 server_challenge[16]; /* MSCHAPv2 ServerChallenge */
73	u8 client_challenge[16]; /* MSCHAPv2 ClientChallenge */
74};
75
76
77struct wpabuf;
78struct tls_connection;
79
80struct eap_fast_tlv_parse {
81	u8 *eap_payload_tlv;
82	size_t eap_payload_tlv_len;
83	struct eap_tlv_crypto_binding_tlv *crypto_binding;
84	size_t crypto_binding_len;
85	int iresult;
86	int result;
87	int request_action;
88	u8 *pac;
89	size_t pac_len;
90};
91
92void eap_fast_put_tlv_hdr(struct wpabuf *buf, u16 type, u16 len);
93void eap_fast_put_tlv(struct wpabuf *buf, u16 type, const void *data,
94		      u16 len);
95void eap_fast_put_tlv_buf(struct wpabuf *buf, u16 type,
96			  const struct wpabuf *data);
97struct wpabuf * eap_fast_tlv_eap_payload(struct wpabuf *buf);
98void eap_fast_derive_master_secret(const u8 *pac_key, const u8 *server_random,
99				   const u8 *client_random, u8 *master_secret);
100u8 * eap_fast_derive_key(void *ssl_ctx, struct tls_connection *conn,
101			 const char *label, size_t len);
102void eap_fast_derive_eap_msk(const u8 *simck, u8 *msk);
103void eap_fast_derive_eap_emsk(const u8 *simck, u8 *emsk);
104int eap_fast_parse_tlv(struct eap_fast_tlv_parse *tlv,
105		       int tlv_type, u8 *pos, int len);
106
107#endif /* EAP_FAST_H */
108