1/* 2 * EAP peer/server: EAP-SIM/AKA/AKA' shared routines 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_SIM_COMMON_H 10#define EAP_SIM_COMMON_H 11 12#define EAP_SIM_NONCE_S_LEN 16 13#define EAP_SIM_NONCE_MT_LEN 16 14#define EAP_SIM_MAC_LEN 16 15#define EAP_SIM_MK_LEN 20 16#define EAP_SIM_K_AUT_LEN 16 17#define EAP_SIM_K_ENCR_LEN 16 18#define EAP_SIM_KEYING_DATA_LEN 64 19#define EAP_SIM_IV_LEN 16 20#define EAP_SIM_KC_LEN 8 21#define EAP_SIM_SRES_LEN 4 22 23#define GSM_RAND_LEN 16 24 25#define EAP_SIM_VERSION 1 26 27/* EAP-SIM Subtypes */ 28#define EAP_SIM_SUBTYPE_START 10 29#define EAP_SIM_SUBTYPE_CHALLENGE 11 30#define EAP_SIM_SUBTYPE_NOTIFICATION 12 31#define EAP_SIM_SUBTYPE_REAUTHENTICATION 13 32#define EAP_SIM_SUBTYPE_CLIENT_ERROR 14 33 34/* AT_CLIENT_ERROR_CODE error codes */ 35#define EAP_SIM_UNABLE_TO_PROCESS_PACKET 0 36#define EAP_SIM_UNSUPPORTED_VERSION 1 37#define EAP_SIM_INSUFFICIENT_NUM_OF_CHAL 2 38#define EAP_SIM_RAND_NOT_FRESH 3 39 40#define EAP_SIM_MAX_FAST_REAUTHS 1000 41 42#define EAP_SIM_MAX_CHAL 3 43 44 45/* EAP-AKA Subtypes */ 46#define EAP_AKA_SUBTYPE_CHALLENGE 1 47#define EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT 2 48#define EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE 4 49#define EAP_AKA_SUBTYPE_IDENTITY 5 50#define EAP_AKA_SUBTYPE_NOTIFICATION 12 51#define EAP_AKA_SUBTYPE_REAUTHENTICATION 13 52#define EAP_AKA_SUBTYPE_CLIENT_ERROR 14 53 54/* AT_CLIENT_ERROR_CODE error codes */ 55#define EAP_AKA_UNABLE_TO_PROCESS_PACKET 0 56 57#define EAP_AKA_RAND_LEN 16 58#define EAP_AKA_AUTN_LEN 16 59#define EAP_AKA_AUTS_LEN 14 60#define EAP_AKA_RES_MAX_LEN 16 61#define EAP_AKA_IK_LEN 16 62#define EAP_AKA_CK_LEN 16 63#define EAP_AKA_MAX_FAST_REAUTHS 1000 64#define EAP_AKA_MIN_RES_LEN 4 65#define EAP_AKA_MAX_RES_LEN 16 66#define EAP_AKA_CHECKCODE_LEN 20 67 68#define EAP_AKA_PRIME_K_AUT_LEN 32 69#define EAP_AKA_PRIME_CHECKCODE_LEN 32 70#define EAP_AKA_PRIME_K_RE_LEN 32 71 72struct wpabuf; 73 74void eap_sim_derive_mk(const u8 *identity, size_t identity_len, 75 const u8 *nonce_mt, u16 selected_version, 76 const u8 *ver_list, size_t ver_list_len, 77 int num_chal, const u8 *kc, u8 *mk); 78void eap_aka_derive_mk(const u8 *identity, size_t identity_len, 79 const u8 *ik, const u8 *ck, u8 *mk); 80int eap_sim_derive_keys(const u8 *mk, u8 *k_encr, u8 *k_aut, u8 *msk, 81 u8 *emsk); 82int eap_sim_derive_keys_reauth(u16 _counter, 83 const u8 *identity, size_t identity_len, 84 const u8 *nonce_s, const u8 *mk, u8 *msk, 85 u8 *emsk); 86int eap_sim_verify_mac(const u8 *k_aut, const struct wpabuf *req, 87 const u8 *mac, const u8 *extra, size_t extra_len); 88void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac, 89 const u8 *extra, size_t extra_len); 90 91#if defined(EAP_AKA_PRIME) || defined(EAP_SERVER_AKA_PRIME) 92void eap_aka_prime_derive_keys(const u8 *identity, size_t identity_len, 93 const u8 *ik, const u8 *ck, u8 *k_encr, 94 u8 *k_aut, u8 *k_re, u8 *msk, u8 *emsk); 95int eap_aka_prime_derive_keys_reauth(const u8 *k_re, u16 counter, 96 const u8 *identity, size_t identity_len, 97 const u8 *nonce_s, u8 *msk, u8 *emsk); 98int eap_sim_verify_mac_sha256(const u8 *k_aut, const struct wpabuf *req, 99 const u8 *mac, const u8 *extra, 100 size_t extra_len); 101void eap_sim_add_mac_sha256(const u8 *k_aut, const u8 *msg, size_t msg_len, 102 u8 *mac, const u8 *extra, size_t extra_len); 103 104void eap_aka_prime_derive_ck_ik_prime(u8 *ck, u8 *ik, const u8 *sqn_ak, 105 const u8 *network_name, 106 size_t network_name_len); 107#else /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */ 108static inline void eap_aka_prime_derive_keys(const u8 *identity, 109 size_t identity_len, 110 const u8 *ik, const u8 *ck, 111 u8 *k_encr, u8 *k_aut, u8 *k_re, 112 u8 *msk, u8 *emsk) 113{ 114} 115 116static inline int eap_aka_prime_derive_keys_reauth(const u8 *k_re, u16 counter, 117 const u8 *identity, 118 size_t identity_len, 119 const u8 *nonce_s, u8 *msk, 120 u8 *emsk) 121{ 122 return -1; 123} 124 125static inline int eap_sim_verify_mac_sha256(const u8 *k_aut, 126 const struct wpabuf *req, 127 const u8 *mac, const u8 *extra, 128 size_t extra_len) 129{ 130 return -1; 131} 132#endif /* EAP_AKA_PRIME || EAP_SERVER_AKA_PRIME */ 133 134 135/* EAP-SIM/AKA Attributes (0..127 non-skippable) */ 136#define EAP_SIM_AT_RAND 1 137#define EAP_SIM_AT_AUTN 2 /* only AKA */ 138#define EAP_SIM_AT_RES 3 /* only AKA, only peer->server */ 139#define EAP_SIM_AT_AUTS 4 /* only AKA, only peer->server */ 140#define EAP_SIM_AT_PADDING 6 /* only encrypted */ 141#define EAP_SIM_AT_NONCE_MT 7 /* only SIM, only send */ 142#define EAP_SIM_AT_PERMANENT_ID_REQ 10 143#define EAP_SIM_AT_MAC 11 144#define EAP_SIM_AT_NOTIFICATION 12 145#define EAP_SIM_AT_ANY_ID_REQ 13 146#define EAP_SIM_AT_IDENTITY 14 /* only send */ 147#define EAP_SIM_AT_VERSION_LIST 15 /* only SIM */ 148#define EAP_SIM_AT_SELECTED_VERSION 16 /* only SIM */ 149#define EAP_SIM_AT_FULLAUTH_ID_REQ 17 150#define EAP_SIM_AT_COUNTER 19 /* only encrypted */ 151#define EAP_SIM_AT_COUNTER_TOO_SMALL 20 /* only encrypted */ 152#define EAP_SIM_AT_NONCE_S 21 /* only encrypted */ 153#define EAP_SIM_AT_CLIENT_ERROR_CODE 22 /* only send */ 154#define EAP_SIM_AT_KDF_INPUT 23 /* only AKA' */ 155#define EAP_SIM_AT_KDF 24 /* only AKA' */ 156#define EAP_SIM_AT_IV 129 157#define EAP_SIM_AT_ENCR_DATA 130 158#define EAP_SIM_AT_NEXT_PSEUDONYM 132 /* only encrypted */ 159#define EAP_SIM_AT_NEXT_REAUTH_ID 133 /* only encrypted */ 160#define EAP_SIM_AT_CHECKCODE 134 /* only AKA */ 161#define EAP_SIM_AT_RESULT_IND 135 162#define EAP_SIM_AT_BIDDING 136 163 164/* AT_NOTIFICATION notification code values */ 165#define EAP_SIM_GENERAL_FAILURE_AFTER_AUTH 0 166#define EAP_SIM_TEMPORARILY_DENIED 1026 167#define EAP_SIM_NOT_SUBSCRIBED 1031 168#define EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH 16384 169#define EAP_SIM_SUCCESS 32768 170 171/* EAP-AKA' AT_KDF Key Derivation Function values */ 172#define EAP_AKA_PRIME_KDF 1 173 174/* AT_BIDDING flags */ 175#define EAP_AKA_BIDDING_FLAG_D 0x8000 176 177 178enum eap_sim_id_req { 179 NO_ID_REQ, ANY_ID, FULLAUTH_ID, PERMANENT_ID 180}; 181 182 183struct eap_sim_attrs { 184 const u8 *rand, *autn, *mac, *iv, *encr_data, *version_list, *nonce_s; 185 const u8 *next_pseudonym, *next_reauth_id; 186 const u8 *nonce_mt, *identity, *res, *auts; 187 const u8 *checkcode; 188 const u8 *kdf_input; 189 const u8 *bidding; 190 size_t num_chal, version_list_len, encr_data_len; 191 size_t next_pseudonym_len, next_reauth_id_len, identity_len, res_len; 192 size_t res_len_bits; 193 size_t checkcode_len; 194 size_t kdf_input_len; 195 enum eap_sim_id_req id_req; 196 int notification, counter, selected_version, client_error_code; 197 int counter_too_small; 198 int result_ind; 199#define EAP_AKA_PRIME_KDF_MAX 10 200 u16 kdf[EAP_AKA_PRIME_KDF_MAX]; 201 size_t kdf_count; 202}; 203 204int eap_sim_parse_attr(const u8 *start, const u8 *end, 205 struct eap_sim_attrs *attr, int aka, int encr); 206u8 * eap_sim_parse_encr(const u8 *k_encr, const u8 *encr_data, 207 size_t encr_data_len, const u8 *iv, 208 struct eap_sim_attrs *attr, int aka); 209 210 211struct eap_sim_msg; 212 213struct eap_sim_msg * eap_sim_msg_init(int code, int id, int type, int subtype); 214struct wpabuf * eap_sim_msg_finish(struct eap_sim_msg *msg, int type, 215 const u8 *k_aut, 216 const u8 *extra, size_t extra_len); 217void eap_sim_msg_free(struct eap_sim_msg *msg); 218u8 * eap_sim_msg_add_full(struct eap_sim_msg *msg, u8 attr, 219 const u8 *data, size_t len); 220u8 * eap_sim_msg_add(struct eap_sim_msg *msg, u8 attr, 221 u16 value, const u8 *data, size_t len); 222u8 * eap_sim_msg_add_mac(struct eap_sim_msg *msg, u8 attr); 223int eap_sim_msg_add_encr_start(struct eap_sim_msg *msg, u8 attr_iv, 224 u8 attr_encr); 225int eap_sim_msg_add_encr_end(struct eap_sim_msg *msg, u8 *k_encr, 226 int attr_pad); 227 228void eap_sim_report_notification(void *msg_ctx, int notification, int aka); 229 230#endif /* EAP_SIM_COMMON_H */ 231