2 * EAP peer/server: EAP-SIM/AKA/AKA' shared routines
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
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.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
15 #ifndef EAP_SIM_COMMON_H
16 #define EAP_SIM_COMMON_H
18 #define EAP_SIM_NONCE_S_LEN 16
19 #define EAP_SIM_NONCE_MT_LEN 16
20 #define EAP_SIM_MAC_LEN 16
21 #define EAP_SIM_MK_LEN 20
22 #define EAP_SIM_K_AUT_LEN 16
23 #define EAP_SIM_K_ENCR_LEN 16
24 #define EAP_SIM_KEYING_DATA_LEN 64
25 #define EAP_SIM_IV_LEN 16
26 #define EAP_SIM_KC_LEN 8
27 #define EAP_SIM_SRES_LEN 4
29 #define GSM_RAND_LEN 16
31 #define EAP_SIM_VERSION 1
33 /* EAP-SIM Subtypes */
34 #define EAP_SIM_SUBTYPE_START 10
35 #define EAP_SIM_SUBTYPE_CHALLENGE 11
36 #define EAP_SIM_SUBTYPE_NOTIFICATION 12
37 #define EAP_SIM_SUBTYPE_REAUTHENTICATION 13
38 #define EAP_SIM_SUBTYPE_CLIENT_ERROR 14
40 /* AT_CLIENT_ERROR_CODE error codes */
41 #define EAP_SIM_UNABLE_TO_PROCESS_PACKET 0
42 #define EAP_SIM_UNSUPPORTED_VERSION 1
43 #define EAP_SIM_INSUFFICIENT_NUM_OF_CHAL 2
44 #define EAP_SIM_RAND_NOT_FRESH 3
46 #define EAP_SIM_MAX_FAST_REAUTHS 1000
48 #define EAP_SIM_MAX_CHAL 3
51 /* EAP-AKA Subtypes */
52 #define EAP_AKA_SUBTYPE_CHALLENGE 1
53 #define EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT 2
54 #define EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE 4
55 #define EAP_AKA_SUBTYPE_IDENTITY 5
56 #define EAP_AKA_SUBTYPE_NOTIFICATION 12
57 #define EAP_AKA_SUBTYPE_REAUTHENTICATION 13
58 #define EAP_AKA_SUBTYPE_CLIENT_ERROR 14
60 /* AT_CLIENT_ERROR_CODE error codes */
61 #define EAP_AKA_UNABLE_TO_PROCESS_PACKET 0
63 #define EAP_AKA_RAND_LEN 16
64 #define EAP_AKA_AUTN_LEN 16
65 #define EAP_AKA_AUTS_LEN 14
66 #define EAP_AKA_RES_MAX_LEN 16
67 #define EAP_AKA_IK_LEN 16
68 #define EAP_AKA_CK_LEN 16
69 #define EAP_AKA_MAX_FAST_REAUTHS 1000
70 #define EAP_AKA_MIN_RES_LEN 4
71 #define EAP_AKA_MAX_RES_LEN 16
72 #define EAP_AKA_CHECKCODE_LEN 20
74 #define EAP_AKA_PRIME_K_AUT_LEN 32
75 #define EAP_AKA_PRIME_CHECKCODE_LEN 32
76 #define EAP_AKA_PRIME_K_RE_LEN 32
80 void eap_sim_derive_mk(const u8 *identity, size_t identity_len,
81 const u8 *nonce_mt, u16 selected_version,
82 const u8 *ver_list, size_t ver_list_len,
83 int num_chal, const u8 *kc, u8 *mk);
84 void eap_aka_derive_mk(const u8 *identity, size_t identity_len,
85 const u8 *ik, const u8 *ck, u8 *mk);
86 int eap_sim_derive_keys(const u8 *mk, u8 *k_encr, u8 *k_aut, u8 *msk,
88 int eap_sim_derive_keys_reauth(u16 _counter,
89 const u8 *identity, size_t identity_len,
90 const u8 *nonce_s, const u8 *mk, u8 *msk,
92 int eap_sim_verify_mac(const u8 *k_aut, const struct wpabuf *req,
93 const u8 *mac, const u8 *extra, size_t extra_len);
94 void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac,
95 const u8 *extra, size_t extra_len);
97 void eap_aka_prime_derive_keys(const u8 *identity, size_t identity_len,
98 const u8 *ik, const u8 *ck, u8 *k_encr,
99 u8 *k_aut, u8 *k_re, u8 *msk, u8 *emsk);
100 int eap_aka_prime_derive_keys_reauth(const u8 *k_re, u16 counter,
101 const u8 *identity, size_t identity_len,
102 const u8 *nonce_s, u8 *msk, u8 *emsk);
103 int eap_sim_verify_mac_sha256(const u8 *k_aut, const struct wpabuf *req,
104 const u8 *mac, const u8 *extra,
106 void eap_sim_add_mac_sha256(const u8 *k_aut, const u8 *msg, size_t msg_len,
107 u8 *mac, const u8 *extra, size_t extra_len);
109 void eap_aka_prime_derive_ck_ik_prime(u8 *ck, u8 *ik, const u8 *sqn_ak,
110 const u8 *network_name,
111 size_t network_name_len);
114 /* EAP-SIM/AKA Attributes (0..127 non-skippable) */
115 #define EAP_SIM_AT_RAND 1
116 #define EAP_SIM_AT_AUTN 2 /* only AKA */
117 #define EAP_SIM_AT_RES 3 /* only AKA, only peer->server */
118 #define EAP_SIM_AT_AUTS 4 /* only AKA, only peer->server */
119 #define EAP_SIM_AT_PADDING 6 /* only encrypted */
120 #define EAP_SIM_AT_NONCE_MT 7 /* only SIM, only send */
121 #define EAP_SIM_AT_PERMANENT_ID_REQ 10
122 #define EAP_SIM_AT_MAC 11
123 #define EAP_SIM_AT_NOTIFICATION 12
124 #define EAP_SIM_AT_ANY_ID_REQ 13
125 #define EAP_SIM_AT_IDENTITY 14 /* only send */
126 #define EAP_SIM_AT_VERSION_LIST 15 /* only SIM */
127 #define EAP_SIM_AT_SELECTED_VERSION 16 /* only SIM */
128 #define EAP_SIM_AT_FULLAUTH_ID_REQ 17
129 #define EAP_SIM_AT_COUNTER 19 /* only encrypted */
130 #define EAP_SIM_AT_COUNTER_TOO_SMALL 20 /* only encrypted */
131 #define EAP_SIM_AT_NONCE_S 21 /* only encrypted */
132 #define EAP_SIM_AT_CLIENT_ERROR_CODE 22 /* only send */
133 #define EAP_SIM_AT_KDF_INPUT 23 /* only AKA' */
134 #define EAP_SIM_AT_KDF 24 /* only AKA' */
135 #define EAP_SIM_AT_IV 129
136 #define EAP_SIM_AT_ENCR_DATA 130
137 #define EAP_SIM_AT_NEXT_PSEUDONYM 132 /* only encrypted */
138 #define EAP_SIM_AT_NEXT_REAUTH_ID 133 /* only encrypted */
139 #define EAP_SIM_AT_CHECKCODE 134 /* only AKA */
140 #define EAP_SIM_AT_RESULT_IND 135
141 #define EAP_SIM_AT_BIDDING 136
143 /* AT_NOTIFICATION notification code values */
144 #define EAP_SIM_GENERAL_FAILURE_AFTER_AUTH 0
145 #define EAP_SIM_TEMPORARILY_DENIED 1026
146 #define EAP_SIM_NOT_SUBSCRIBED 1031
147 #define EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH 16384
148 #define EAP_SIM_SUCCESS 32768
150 /* EAP-AKA' AT_KDF Key Derivation Function values */
151 #define EAP_AKA_PRIME_KDF 1
153 /* AT_BIDDING flags */
154 #define EAP_AKA_BIDDING_FLAG_D 0x8000
157 enum eap_sim_id_req {
158 NO_ID_REQ, ANY_ID, FULLAUTH_ID, PERMANENT_ID
162 struct eap_sim_attrs {
163 const u8 *rand, *autn, *mac, *iv, *encr_data, *version_list, *nonce_s;
164 const u8 *next_pseudonym, *next_reauth_id;
165 const u8 *nonce_mt, *identity, *res, *auts;
169 size_t num_chal, version_list_len, encr_data_len;
170 size_t next_pseudonym_len, next_reauth_id_len, identity_len, res_len;
172 size_t checkcode_len;
173 size_t kdf_input_len;
174 enum eap_sim_id_req id_req;
175 int notification, counter, selected_version, client_error_code;
176 int counter_too_small;
178 #define EAP_AKA_PRIME_KDF_MAX 10
179 u16 kdf[EAP_AKA_PRIME_KDF_MAX];
183 int eap_sim_parse_attr(const u8 *start, const u8 *end,
184 struct eap_sim_attrs *attr, int aka, int encr);
185 u8 * eap_sim_parse_encr(const u8 *k_encr, const u8 *encr_data,
186 size_t encr_data_len, const u8 *iv,
187 struct eap_sim_attrs *attr, int aka);
192 struct eap_sim_msg * eap_sim_msg_init(int code, int id, int type, int subtype);
193 struct wpabuf * eap_sim_msg_finish(struct eap_sim_msg *msg, const u8 *k_aut,
194 const u8 *extra, size_t extra_len);
195 void eap_sim_msg_free(struct eap_sim_msg *msg);
196 u8 * eap_sim_msg_add_full(struct eap_sim_msg *msg, u8 attr,
197 const u8 *data, size_t len);
198 u8 * eap_sim_msg_add(struct eap_sim_msg *msg, u8 attr,
199 u16 value, const u8 *data, size_t len);
200 u8 * eap_sim_msg_add_mac(struct eap_sim_msg *msg, u8 attr);
201 int eap_sim_msg_add_encr_start(struct eap_sim_msg *msg, u8 attr_iv,
203 int eap_sim_msg_add_encr_end(struct eap_sim_msg *msg, u8 *k_encr,
206 void eap_sim_report_notification(void *msg_ctx, int notification, int aka);
208 #endif /* EAP_SIM_COMMON_H */