src/eap_common/eap_fast_common.h

   1 /*
   2  * EAP-FAST definitions (RFC 4851)
   3  * Copyright (c) 2004-2008, 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_FAST_H
  16 #define EAP_FAST_H
  17
  18 #define EAP_FAST_VERSION 1
  19 #define EAP_FAST_KEY_LEN 64
  20 #define EAP_FAST_SIMCK_LEN 40
  21 #define EAP_FAST_SKS_LEN 40
  22 #define EAP_FAST_CMK_LEN 20
  23
  24 #define TLS_EXT_PAC_OPAQUE 35
  25
  26 /*
  27  * RFC 5422: Section 4.2.1 - Formats for PAC TLV Attributes / Type Field
  28  * Note: bit 0x8000 (Mandatory) and bit 0x4000 (Reserved) are also defined
  29  * in the general PAC TLV format (Section 4.2).
  30  */
  31 #define PAC_TYPE_PAC_KEY 1
  32 #define PAC_TYPE_PAC_OPAQUE 2
  33 #define PAC_TYPE_CRED_LIFETIME 3
  34 #define PAC_TYPE_A_ID 4
  35 #define PAC_TYPE_I_ID 5
  36 /*
  37  * 6 was previous assigned for SERVER_PROTECTED_DATA, but
  38  * draft-cam-winget-eap-fast-provisioning-02.txt changed this to Reserved.
  39  */
  40 #define PAC_TYPE_A_ID_INFO 7
  41 #define PAC_TYPE_PAC_ACKNOWLEDGEMENT 8
  42 #define PAC_TYPE_PAC_INFO 9
  43 #define PAC_TYPE_PAC_TYPE 10
  44
  45 #ifdef _MSC_VER
  46 #pragma pack(push, 1)
  47 #endif /* _MSC_VER */
  48
  49 struct pac_tlv_hdr {
  50         be16 type;
  51         be16 len;
  52 } STRUCT_PACKED;
  53
  54 #ifdef _MSC_VER
  55 #pragma pack(pop)
  56 #endif /* _MSC_VER */
  57
  58
  59 #define EAP_FAST_PAC_KEY_LEN 32
  60
  61 /* RFC 5422: 4.2.6 PAC-Type TLV */
  62 #define PAC_TYPE_TUNNEL_PAC 1
  63 /* Application Specific Short Lived PACs (only in volatile storage) */
  64 /* User Authorization PAC */
  65 #define PAC_TYPE_USER_AUTHORIZATION 3
  66 /* Application Specific Long Lived PACs */
  67 /* Machine Authentication PAC */
  68 #define PAC_TYPE_MACHINE_AUTHENTICATION 2
  69
  70
  71 /*
  72  * RFC 5422:
  73  * Section 3.3 - Key Derivations Used in the EAP-FAST Provisioning Exchange
  74  */
  75 struct eap_fast_key_block_provisioning {
  76         /* Extra key material after TLS key_block */
  77         u8 session_key_seed[EAP_FAST_SKS_LEN];
  78         u8 server_challenge[16]; /* MSCHAPv2 ServerChallenge */
  79         u8 client_challenge[16]; /* MSCHAPv2 ClientChallenge */
  80 };
  81
  82
  83 struct wpabuf;
  84 struct tls_connection;
  85
  86 struct eap_fast_tlv_parse {
  87         u8 *eap_payload_tlv;
  88         size_t eap_payload_tlv_len;
  89         struct eap_tlv_crypto_binding_tlv *crypto_binding;
  90         size_t crypto_binding_len;
  91         int iresult;
  92         int result;
  93         int request_action;
  94         u8 *pac;
  95         size_t pac_len;
  96 };
  97
  98 void eap_fast_put_tlv_hdr(struct wpabuf *buf, u16 type, u16 len);
  99 void eap_fast_put_tlv(struct wpabuf *buf, u16 type, const void *data,
 100                       u16 len);
 101 void eap_fast_put_tlv_buf(struct wpabuf *buf, u16 type,
 102                           const struct wpabuf *data);
 103 struct wpabuf * eap_fast_tlv_eap_payload(struct wpabuf *buf);
 104 void eap_fast_derive_master_secret(const u8 *pac_key, const u8 *server_random,
 105                                    const u8 *client_random, u8 *master_secret);
 106 u8 * eap_fast_derive_key(void *ssl_ctx, struct tls_connection *conn,
 107                          const char *label, size_t len);
 108 void eap_fast_derive_eap_msk(const u8 *simck, u8 *msk);
 109 void eap_fast_derive_eap_emsk(const u8 *simck, u8 *emsk);
 110 int eap_fast_parse_tlv(struct eap_fast_tlv_parse *tlv,
 111                        int tlv_type, u8 *pos, int len);
 112
 113 #endif /* EAP_FAST_H */