1 /* 2 * EAP peer state machine functions (RFC 4137) 3 * Copyright (c) 2004-2012, 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_H 10 #define EAP_H 11 12 #include "common/defs.h" 13 #include "eap_common/eap_defs.h" 14 #include "eap_peer/eap_methods.h" 15 16 struct eap_sm; 17 struct wpa_config_blob; 18 struct wpabuf; 19 struct tls_cert_data; 20 21 struct eap_method_type { 22 int vendor; 23 u32 method; 24 }; 25 26 #ifdef IEEE8021X_EAPOL 27 28 /** 29 * enum eapol_bool_var - EAPOL boolean state variables for EAP state machine 30 * 31 * These variables are used in the interface between EAP peer state machine and 32 * lower layer. These are defined in RFC 4137, Sect. 4.1. Lower layer code is 33 * expected to maintain these variables and register a callback functions for 34 * EAP state machine to get and set the variables. 35 */ 36 enum eapol_bool_var { 37 /** 38 * EAPOL_eapSuccess - EAP SUCCESS state reached 39 * 40 * EAP state machine reads and writes this value. 41 */ 42 EAPOL_eapSuccess, 43 44 /** 45 * EAPOL_eapRestart - Lower layer request to restart authentication 46 * 47 * Set to true in lower layer, false in EAP state machine. 48 */ 49 EAPOL_eapRestart, 50 51 /** 52 * EAPOL_eapFail - EAP FAILURE state reached 53 * 54 * EAP state machine writes this value. 55 */ 56 EAPOL_eapFail, 57 58 /** 59 * EAPOL_eapResp - Response to send 60 * 61 * Set to true in EAP state machine, false in lower layer. 62 */ 63 EAPOL_eapResp, 64 65 /** 66 * EAPOL_eapNoResp - Request has been process; no response to send 67 * 68 * Set to true in EAP state machine, false in lower layer. 69 */ 70 EAPOL_eapNoResp, 71 72 /** 73 * EAPOL_eapReq - EAP request available from lower layer 74 * 75 * Set to true in lower layer, false in EAP state machine. 76 */ 77 EAPOL_eapReq, 78 79 /** 80 * EAPOL_portEnabled - Lower layer is ready for communication 81 * 82 * EAP state machines reads this value. 83 */ 84 EAPOL_portEnabled, 85 86 /** 87 * EAPOL_altAccept - Alternate indication of success (RFC3748) 88 * 89 * EAP state machines reads this value. 90 */ 91 EAPOL_altAccept, 92 93 /** 94 * EAPOL_altReject - Alternate indication of failure (RFC3748) 95 * 96 * EAP state machines reads this value. 97 */ 98 EAPOL_altReject, 99 100 /** 101 * EAPOL_eapTriggerStart - EAP-based trigger to send EAPOL-Start 102 * 103 * EAP state machine writes this value. 104 */ 105 EAPOL_eapTriggerStart 106 }; 107 108 /** 109 * enum eapol_int_var - EAPOL integer state variables for EAP state machine 110 * 111 * These variables are used in the interface between EAP peer state machine and 112 * lower layer. These are defined in RFC 4137, Sect. 4.1. Lower layer code is 113 * expected to maintain these variables and register a callback functions for 114 * EAP state machine to get and set the variables. 115 */ 116 enum eapol_int_var { 117 /** 118 * EAPOL_idleWhile - Outside time for EAP peer timeout 119 * 120 * This integer variable is used to provide an outside timer that the 121 * external (to EAP state machine) code must decrement by one every 122 * second until the value reaches zero. This is used in the same way as 123 * EAPOL state machine timers. EAP state machine reads and writes this 124 * value. 125 */ 126 EAPOL_idleWhile 127 }; 128 129 /** 130 * struct eapol_callbacks - Callback functions from EAP to lower layer 131 * 132 * This structure defines the callback functions that EAP state machine 133 * requires from the lower layer (usually EAPOL state machine) for updating 134 * state variables and requesting information. eapol_ctx from 135 * eap_peer_sm_init() call will be used as the ctx parameter for these 136 * callback functions. 137 */ 138 struct eapol_callbacks { 139 /** 140 * get_config - Get pointer to the current network configuration 141 * @ctx: eapol_ctx from eap_peer_sm_init() call 142 */ 143 struct eap_peer_config * (*get_config)(void *ctx); 144 145 /** 146 * get_bool - Get a boolean EAPOL state variable 147 * @variable: EAPOL boolean variable to get 148 * Returns: Value of the EAPOL variable 149 */ 150 bool (*get_bool)(void *ctx, enum eapol_bool_var variable); 151 152 /** 153 * set_bool - Set a boolean EAPOL state variable 154 * @ctx: eapol_ctx from eap_peer_sm_init() call 155 * @variable: EAPOL boolean variable to set 156 * @value: Value for the EAPOL variable 157 */ 158 void (*set_bool)(void *ctx, enum eapol_bool_var variable, bool value); 159 160 /** 161 * get_int - Get an integer EAPOL state variable 162 * @ctx: eapol_ctx from eap_peer_sm_init() call 163 * @variable: EAPOL integer variable to get 164 * Returns: Value of the EAPOL variable 165 */ 166 unsigned int (*get_int)(void *ctx, enum eapol_int_var variable); 167 168 /** 169 * set_int - Set an integer EAPOL state variable 170 * @ctx: eapol_ctx from eap_peer_sm_init() call 171 * @variable: EAPOL integer variable to set 172 * @value: Value for the EAPOL variable 173 */ 174 void (*set_int)(void *ctx, enum eapol_int_var variable, 175 unsigned int value); 176 177 /** 178 * get_eapReqData - Get EAP-Request data 179 * @ctx: eapol_ctx from eap_peer_sm_init() call 180 * @len: Pointer to variable that will be set to eapReqDataLen 181 * Returns: Reference to eapReqData (EAP state machine will not free 182 * this) or %NULL if eapReqData not available. 183 */ 184 struct wpabuf * (*get_eapReqData)(void *ctx); 185 186 /** 187 * set_config_blob - Set named configuration blob 188 * @ctx: eapol_ctx from eap_peer_sm_init() call 189 * @blob: New value for the blob 190 * 191 * Adds a new configuration blob or replaces the current value of an 192 * existing blob. 193 */ 194 void (*set_config_blob)(void *ctx, struct wpa_config_blob *blob); 195 196 /** 197 * get_config_blob - Get a named configuration blob 198 * @ctx: eapol_ctx from eap_peer_sm_init() call 199 * @name: Name of the blob 200 * Returns: Pointer to blob data or %NULL if not found 201 */ 202 const struct wpa_config_blob * (*get_config_blob)(void *ctx, 203 const char *name); 204 205 /** 206 * notify_pending - Notify that a pending request can be retried 207 * @ctx: eapol_ctx from eap_peer_sm_init() call 208 * 209 * An EAP method can perform a pending operation (e.g., to get a 210 * response from an external process). Once the response is available, 211 * this callback function can be used to request EAPOL state machine to 212 * retry delivering the previously received (and still unanswered) EAP 213 * request to EAP state machine. 214 */ 215 void (*notify_pending)(void *ctx); 216 217 /** 218 * eap_param_needed - Notify that EAP parameter is needed 219 * @ctx: eapol_ctx from eap_peer_sm_init() call 220 * @field: Field indicator (e.g., WPA_CTRL_REQ_EAP_IDENTITY) 221 * @txt: User readable text describing the required parameter 222 */ 223 void (*eap_param_needed)(void *ctx, enum wpa_ctrl_req_type field, 224 const char *txt); 225 226 /** 227 * notify_cert - Notification of a peer certificate 228 * @ctx: eapol_ctx from eap_peer_sm_init() call 229 * @cert: Certificate information 230 * @cert_hash: SHA-256 hash of the certificate 231 */ 232 void (*notify_cert)(void *ctx, struct tls_cert_data *cert, 233 const char *cert_hash); 234 235 /** 236 * notify_status - Notification of the current EAP state 237 * @ctx: eapol_ctx from eap_peer_sm_init() call 238 * @status: Step in the process of EAP authentication 239 * @parameter: Step-specific parameter, e.g., EAP method name 240 */ 241 void (*notify_status)(void *ctx, const char *status, 242 const char *parameter); 243 244 /** 245 * notify_eap_error - Report EAP method error code 246 * @ctx: eapol_ctx from eap_peer_sm_init() call 247 * @error_code: Error code from the used EAP method 248 */ 249 void (*notify_eap_error)(void *ctx, int error_code); 250 251 #ifdef CONFIG_EAP_PROXY 252 /** 253 * eap_proxy_cb - Callback signifying any updates from eap_proxy 254 * @ctx: eapol_ctx from eap_peer_sm_init() call 255 */ 256 void (*eap_proxy_cb)(void *ctx); 257 258 /** 259 * eap_proxy_notify_sim_status - Notification of SIM status change 260 * @ctx: eapol_ctx from eap_peer_sm_init() call 261 * @sim_state: One of enum value from sim_state 262 */ 263 void (*eap_proxy_notify_sim_status)(void *ctx, 264 enum eap_proxy_sim_state sim_state); 265 266 /** 267 * get_imsi - Get the IMSI value from eap_proxy 268 * @ctx: eapol_ctx from eap_peer_sm_init() call 269 * @sim_num: SIM/USIM number to get the IMSI value for 270 * @imsi: Buffer for IMSI value 271 * @len: Buffer for returning IMSI length in octets 272 * Returns: MNC length (2 or 3) or -1 on error 273 */ 274 int (*get_imsi)(void *ctx, int sim_num, char *imsi, size_t *len); 275 #endif /* CONFIG_EAP_PROXY */ 276 277 /** 278 * set_anon_id - Set or add anonymous identity 279 * @ctx: eapol_ctx from eap_peer_sm_init() call 280 * @id: Anonymous identity (e.g., EAP-SIM pseudonym) or %NULL to clear 281 * @len: Length of anonymous identity in octets 282 */ 283 void (*set_anon_id)(void *ctx, const u8 *id, size_t len); 284 }; 285 286 /** 287 * struct eap_config - Configuration for EAP state machine 288 */ 289 struct eap_config { 290 /** 291 * opensc_engine_path - OpenSC engine for OpenSSL engine support 292 * 293 * Usually, path to engine_opensc.so. 294 */ 295 const char *opensc_engine_path; 296 /** 297 * pkcs11_engine_path - PKCS#11 engine for OpenSSL engine support 298 * 299 * Usually, path to engine_pkcs11.so. 300 */ 301 const char *pkcs11_engine_path; 302 /** 303 * pkcs11_module_path - OpenSC PKCS#11 module for OpenSSL engine 304 * 305 * Usually, path to opensc-pkcs11.so. 306 */ 307 const char *pkcs11_module_path; 308 /** 309 * openssl_ciphers - OpenSSL cipher string 310 * 311 * This is an OpenSSL specific configuration option for configuring the 312 * default ciphers. If not set, "DEFAULT:!EXP:!LOW" is used as the 313 * default. 314 */ 315 const char *openssl_ciphers; 316 /** 317 * wps - WPS context data 318 * 319 * This is only used by EAP-WSC and can be left %NULL if not available. 320 */ 321 struct wps_context *wps; 322 323 /** 324 * cert_in_cb - Include server certificates in callback 325 */ 326 int cert_in_cb; 327 }; 328 329 struct eap_sm * eap_peer_sm_init(void *eapol_ctx, 330 const struct eapol_callbacks *eapol_cb, 331 void *msg_ctx, struct eap_config *conf); 332 void eap_peer_sm_deinit(struct eap_sm *sm); 333 int eap_peer_sm_step(struct eap_sm *sm); 334 void eap_sm_abort(struct eap_sm *sm); 335 int eap_sm_get_status(struct eap_sm *sm, char *buf, size_t buflen, 336 int verbose); 337 const char * eap_sm_get_method_name(struct eap_sm *sm); 338 struct wpabuf * eap_sm_buildIdentity(struct eap_sm *sm, int id, int encrypted); 339 void eap_sm_request_identity(struct eap_sm *sm); 340 void eap_sm_request_password(struct eap_sm *sm); 341 void eap_sm_request_new_password(struct eap_sm *sm); 342 void eap_sm_request_pin(struct eap_sm *sm); 343 void eap_sm_request_otp(struct eap_sm *sm, const char *msg, size_t msg_len); 344 void eap_sm_request_passphrase(struct eap_sm *sm); 345 void eap_sm_request_sim(struct eap_sm *sm, const char *req); 346 void eap_sm_notify_ctrl_attached(struct eap_sm *sm); 347 u32 eap_get_phase2_type(const char *name, int *vendor); 348 struct eap_method_type * eap_get_phase2_types(struct eap_peer_config *config, 349 size_t *count); 350 void eap_set_fast_reauth(struct eap_sm *sm, int enabled); 351 void eap_set_workaround(struct eap_sm *sm, unsigned int workaround); 352 void eap_set_force_disabled(struct eap_sm *sm, int disabled); 353 void eap_set_external_sim(struct eap_sm *sm, int external_sim); 354 int eap_key_available(struct eap_sm *sm); 355 void eap_notify_success(struct eap_sm *sm); 356 void eap_notify_lower_layer_success(struct eap_sm *sm); 357 const u8 * eap_get_eapSessionId(struct eap_sm *sm, size_t *len); 358 const u8 * eap_get_eapKeyData(struct eap_sm *sm, size_t *len); 359 struct wpabuf * eap_get_eapRespData(struct eap_sm *sm); 360 void eap_register_scard_ctx(struct eap_sm *sm, void *ctx); 361 void eap_invalidate_cached_session(struct eap_sm *sm); 362 363 int eap_is_wps_pbc_enrollee(struct eap_peer_config *conf); 364 int eap_is_wps_pin_enrollee(struct eap_peer_config *conf); 365 366 struct ext_password_data; 367 void eap_sm_set_ext_pw_ctx(struct eap_sm *sm, struct ext_password_data *ext); 368 void eap_set_anon_id(struct eap_sm *sm, const u8 *id, size_t len); 369 int eap_peer_was_failure_expected(struct eap_sm *sm); 370 void eap_peer_erp_free_keys(struct eap_sm *sm); 371 struct wpabuf * eap_peer_build_erp_reauth_start(struct eap_sm *sm, u8 eap_id); 372 void eap_peer_finish(struct eap_sm *sm, const struct eap_hdr *hdr, size_t len); 373 int eap_peer_get_erp_info(struct eap_sm *sm, struct eap_peer_config *config, 374 const u8 **username, size_t *username_len, 375 const u8 **realm, size_t *realm_len, u16 *erp_seq_num, 376 const u8 **rrk, size_t *rrk_len); 377 int eap_peer_update_erp_next_seq_num(struct eap_sm *sm, u16 seq_num); 378 void eap_peer_erp_init(struct eap_sm *sm, u8 *ext_session_id, 379 size_t ext_session_id_len, u8 *ext_emsk, 380 size_t ext_emsk_len); 381 382 #endif /* IEEE8021X_EAPOL */ 383 384 #endif /* EAP_H */ 385