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