wpa_auth.c revision 51b6ea882f234c14cd1fe1332a3840cf61fafcca
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IEEE 802.11 RSN / WPA Authenticator 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (c) 2004-2011, Jouni Malinen <j@w1.fi> 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 55d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) * This software may be distributed under the terms of the BSD license. 62a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * See README for more details. 72a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) */ 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 92a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "utils/includes.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "utils/common.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "utils/eloop.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "utils/state_machine.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "common/ieee802_11_defs.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/aes_wrap.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/crypto.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/sha1.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/sha256.h" 192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "crypto/random.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "eapol_auth/eapol_auth_sm.h" 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "ap_config.h" 22c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "ieee802_11.h" 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "wpa_auth.h" 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "pmksa_cache_auth.h" 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "wpa_auth_i.h" 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "wpa_auth_ie.h" 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define STATE_MACHINE_DATA struct wpa_state_machine 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define STATE_MACHINE_DEBUG_PREFIX "WPA" 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define STATE_MACHINE_ADDR sm->addr 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int wpa_sm_step(struct wpa_state_machine *sm); 355d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len); 362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) struct wpa_group *group); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void wpa_request_new_ptk(struct wpa_state_machine *sm); 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 41 struct wpa_group *group); 42static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 43 struct wpa_group *group); 44 45static const u32 dot11RSNAConfigGroupUpdateCount = 4; 46static const u32 dot11RSNAConfigPairwiseUpdateCount = 4; 47static const u32 eapol_key_timeout_first = 100; /* ms */ 48static const u32 eapol_key_timeout_subseq = 1000; /* ms */ 49static const u32 eapol_key_timeout_first_group = 500; /* ms */ 50 51/* TODO: make these configurable */ 52static const int dot11RSNAConfigPMKLifetime = 43200; 53static const int dot11RSNAConfigPMKReauthThreshold = 70; 54static const int dot11RSNAConfigSATimeout = 60; 55 56 57static inline int wpa_auth_mic_failure_report( 58 struct wpa_authenticator *wpa_auth, const u8 *addr) 59{ 60 if (wpa_auth->cb.mic_failure_report) 61 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr); 62 return 0; 63} 64 65 66static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth, 67 const u8 *addr, wpa_eapol_variable var, 68 int value) 69{ 70 if (wpa_auth->cb.set_eapol) 71 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value); 72} 73 74 75static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth, 76 const u8 *addr, wpa_eapol_variable var) 77{ 78 if (wpa_auth->cb.get_eapol == NULL) 79 return -1; 80 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var); 81} 82 83 84static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth, 85 const u8 *addr, const u8 *prev_psk) 86{ 87 if (wpa_auth->cb.get_psk == NULL) 88 return NULL; 89 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk); 90} 91 92 93static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth, 94 const u8 *addr, u8 *msk, size_t *len) 95{ 96 if (wpa_auth->cb.get_msk == NULL) 97 return -1; 98 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len); 99} 100 101 102static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 103 int vlan_id, 104 enum wpa_alg alg, const u8 *addr, int idx, 105 u8 *key, size_t key_len) 106{ 107 if (wpa_auth->cb.set_key == NULL) 108 return -1; 109 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 110 key, key_len); 111} 112 113 114static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 115 const u8 *addr, int idx, u8 *seq) 116{ 117 if (wpa_auth->cb.get_seqnum == NULL) 118 return -1; 119 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 120} 121 122 123static inline int 124wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr, 125 const u8 *data, size_t data_len, int encrypt) 126{ 127 if (wpa_auth->cb.send_eapol == NULL) 128 return -1; 129 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len, 130 encrypt); 131} 132 133 134int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth, 135 int (*cb)(struct wpa_state_machine *sm, void *ctx), 136 void *cb_ctx) 137{ 138 if (wpa_auth->cb.for_each_sta == NULL) 139 return 0; 140 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx); 141} 142 143 144int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth, 145 int (*cb)(struct wpa_authenticator *a, void *ctx), 146 void *cb_ctx) 147{ 148 if (wpa_auth->cb.for_each_auth == NULL) 149 return 0; 150 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx); 151} 152 153 154void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr, 155 logger_level level, const char *txt) 156{ 157 if (wpa_auth->cb.logger == NULL) 158 return; 159 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt); 160} 161 162 163void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr, 164 logger_level level, const char *fmt, ...) 165{ 166 char *format; 167 int maxlen; 168 va_list ap; 169 170 if (wpa_auth->cb.logger == NULL) 171 return; 172 173 maxlen = os_strlen(fmt) + 100; 174 format = os_malloc(maxlen); 175 if (!format) 176 return; 177 178 va_start(ap, fmt); 179 vsnprintf(format, maxlen, fmt, ap); 180 va_end(ap); 181 182 wpa_auth_logger(wpa_auth, addr, level, format); 183 184 os_free(format); 185} 186 187 188static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth, 189 const u8 *addr) 190{ 191 if (wpa_auth->cb.disconnect == NULL) 192 return; 193 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr)); 194 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr, 195 WLAN_REASON_PREV_AUTH_NOT_VALID); 196} 197 198 199static int wpa_use_aes_cmac(struct wpa_state_machine *sm) 200{ 201 int ret = 0; 202#ifdef CONFIG_IEEE80211R 203 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 204 ret = 1; 205#endif /* CONFIG_IEEE80211R */ 206#ifdef CONFIG_IEEE80211W 207 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt)) 208 ret = 1; 209#endif /* CONFIG_IEEE80211W */ 210 return ret; 211} 212 213 214static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx) 215{ 216 struct wpa_authenticator *wpa_auth = eloop_ctx; 217 218 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) { 219 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 220 "initialization."); 221 } else { 222 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd"); 223 wpa_hexdump_key(MSG_DEBUG, "GMK", 224 wpa_auth->group->GMK, WPA_GMK_LEN); 225 } 226 227 if (wpa_auth->conf.wpa_gmk_rekey) { 228 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 229 wpa_rekey_gmk, wpa_auth, NULL); 230 } 231} 232 233 234static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx) 235{ 236 struct wpa_authenticator *wpa_auth = eloop_ctx; 237 struct wpa_group *group; 238 239 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK"); 240 for (group = wpa_auth->group; group; group = group->next) { 241 group->GTKReKey = TRUE; 242 do { 243 group->changed = FALSE; 244 wpa_group_sm_step(wpa_auth, group); 245 } while (group->changed); 246 } 247 248 if (wpa_auth->conf.wpa_group_rekey) { 249 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 250 0, wpa_rekey_gtk, wpa_auth, NULL); 251 } 252} 253 254 255static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 256{ 257 struct wpa_authenticator *wpa_auth = eloop_ctx; 258 struct wpa_state_machine *sm = timeout_ctx; 259 260 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK"); 261 wpa_request_new_ptk(sm); 262 wpa_sm_step(sm); 263} 264 265 266static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx) 267{ 268 if (sm->pmksa == ctx) 269 sm->pmksa = NULL; 270 return 0; 271} 272 273 274static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 275 void *ctx) 276{ 277 struct wpa_authenticator *wpa_auth = ctx; 278 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry); 279} 280 281 282static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth, 283 struct wpa_group *group) 284{ 285 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)]; 286 u8 rkey[32]; 287 unsigned long ptr; 288 289 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0) 290 return -1; 291 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN); 292 293 /* 294 * Counter = PRF-256(Random number, "Init Counter", 295 * Local MAC Address || Time) 296 */ 297 os_memcpy(buf, wpa_auth->addr, ETH_ALEN); 298 wpa_get_ntp_timestamp(buf + ETH_ALEN); 299 ptr = (unsigned long) group; 300 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr)); 301 if (random_get_bytes(rkey, sizeof(rkey)) < 0) 302 return -1; 303 304 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf), 305 group->Counter, WPA_NONCE_LEN) < 0) 306 return -1; 307 wpa_hexdump_key(MSG_DEBUG, "Key Counter", 308 group->Counter, WPA_NONCE_LEN); 309 310 return 0; 311} 312 313 314static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth, 315 int vlan_id, int delay_init) 316{ 317 struct wpa_group *group; 318 319 group = os_zalloc(sizeof(struct wpa_group)); 320 if (group == NULL) 321 return NULL; 322 323 group->GTKAuthenticator = TRUE; 324 group->vlan_id = vlan_id; 325 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 326 327 if (random_pool_ready() != 1) { 328 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 329 "for secure operations - update keys later when " 330 "the first station connects"); 331 } 332 333 /* 334 * Set initial GMK/Counter value here. The actual values that will be 335 * used in negotiations will be set once the first station tries to 336 * connect. This allows more time for collecting additional randomness 337 * on embedded devices. 338 */ 339 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) { 340 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 341 "initialization."); 342 os_free(group); 343 return NULL; 344 } 345 346 group->GInit = TRUE; 347 if (delay_init) { 348 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start " 349 "until Beacon frames have been configured"); 350 /* Initialization is completed in wpa_init_keys(). */ 351 } else { 352 wpa_group_sm_step(wpa_auth, group); 353 group->GInit = FALSE; 354 wpa_group_sm_step(wpa_auth, group); 355 } 356 357 return group; 358} 359 360 361/** 362 * wpa_init - Initialize WPA authenticator 363 * @addr: Authenticator address 364 * @conf: Configuration for WPA authenticator 365 * @cb: Callback functions for WPA authenticator 366 * Returns: Pointer to WPA authenticator data or %NULL on failure 367 */ 368struct wpa_authenticator * wpa_init(const u8 *addr, 369 struct wpa_auth_config *conf, 370 struct wpa_auth_callbacks *cb) 371{ 372 struct wpa_authenticator *wpa_auth; 373 374 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator)); 375 if (wpa_auth == NULL) 376 return NULL; 377 os_memcpy(wpa_auth->addr, addr, ETH_ALEN); 378 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 379 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb)); 380 381 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 382 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 383 os_free(wpa_auth); 384 return NULL; 385 } 386 387 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1); 388 if (wpa_auth->group == NULL) { 389 os_free(wpa_auth->wpa_ie); 390 os_free(wpa_auth); 391 return NULL; 392 } 393 394 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb, 395 wpa_auth); 396 if (wpa_auth->pmksa == NULL) { 397 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed."); 398 os_free(wpa_auth->wpa_ie); 399 os_free(wpa_auth); 400 return NULL; 401 } 402 403#ifdef CONFIG_IEEE80211R 404 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init(); 405 if (wpa_auth->ft_pmk_cache == NULL) { 406 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed."); 407 os_free(wpa_auth->wpa_ie); 408 pmksa_cache_auth_deinit(wpa_auth->pmksa); 409 os_free(wpa_auth); 410 return NULL; 411 } 412#endif /* CONFIG_IEEE80211R */ 413 414 if (wpa_auth->conf.wpa_gmk_rekey) { 415 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 416 wpa_rekey_gmk, wpa_auth, NULL); 417 } 418 419 if (wpa_auth->conf.wpa_group_rekey) { 420 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0, 421 wpa_rekey_gtk, wpa_auth, NULL); 422 } 423 424 return wpa_auth; 425} 426 427 428int wpa_init_keys(struct wpa_authenticator *wpa_auth) 429{ 430 struct wpa_group *group = wpa_auth->group; 431 432 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial " 433 "keys"); 434 wpa_group_sm_step(wpa_auth, group); 435 group->GInit = FALSE; 436 wpa_group_sm_step(wpa_auth, group); 437 return 0; 438} 439 440 441/** 442 * wpa_deinit - Deinitialize WPA authenticator 443 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 444 */ 445void wpa_deinit(struct wpa_authenticator *wpa_auth) 446{ 447 struct wpa_group *group, *prev; 448 449 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL); 450 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 451 452#ifdef CONFIG_PEERKEY 453 while (wpa_auth->stsl_negotiations) 454 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations); 455#endif /* CONFIG_PEERKEY */ 456 457 pmksa_cache_auth_deinit(wpa_auth->pmksa); 458 459#ifdef CONFIG_IEEE80211R 460 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache); 461 wpa_auth->ft_pmk_cache = NULL; 462#endif /* CONFIG_IEEE80211R */ 463 464 os_free(wpa_auth->wpa_ie); 465 466 group = wpa_auth->group; 467 while (group) { 468 prev = group; 469 group = group->next; 470 os_free(prev); 471 } 472 473 os_free(wpa_auth); 474} 475 476 477/** 478 * wpa_reconfig - Update WPA authenticator configuration 479 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 480 * @conf: Configuration for WPA authenticator 481 */ 482int wpa_reconfig(struct wpa_authenticator *wpa_auth, 483 struct wpa_auth_config *conf) 484{ 485 struct wpa_group *group; 486 if (wpa_auth == NULL) 487 return 0; 488 489 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 490 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 491 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 492 return -1; 493 } 494 495 /* 496 * Reinitialize GTK to make sure it is suitable for the new 497 * configuration. 498 */ 499 group = wpa_auth->group; 500 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 501 group->GInit = TRUE; 502 wpa_group_sm_step(wpa_auth, group); 503 group->GInit = FALSE; 504 wpa_group_sm_step(wpa_auth, group); 505 506 return 0; 507} 508 509 510struct wpa_state_machine * 511wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr) 512{ 513 struct wpa_state_machine *sm; 514 515 sm = os_zalloc(sizeof(struct wpa_state_machine)); 516 if (sm == NULL) 517 return NULL; 518 os_memcpy(sm->addr, addr, ETH_ALEN); 519 520 sm->wpa_auth = wpa_auth; 521 sm->group = wpa_auth->group; 522 523 return sm; 524} 525 526 527int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth, 528 struct wpa_state_machine *sm) 529{ 530 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 531 return -1; 532 533#ifdef CONFIG_IEEE80211R 534 if (sm->ft_completed) { 535 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 536 "FT authentication already completed - do not " 537 "start 4-way handshake"); 538 return 0; 539 } 540#endif /* CONFIG_IEEE80211R */ 541 542 if (sm->started) { 543 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); 544 sm->ReAuthenticationRequest = TRUE; 545 return wpa_sm_step(sm); 546 } 547 548 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 549 "start authentication"); 550 sm->started = 1; 551 552 sm->Init = TRUE; 553 if (wpa_sm_step(sm) == 1) 554 return 1; /* should not really happen */ 555 sm->Init = FALSE; 556 sm->AuthenticationRequest = TRUE; 557 return wpa_sm_step(sm); 558} 559 560 561void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) 562{ 563 /* WPA/RSN was not used - clear WPA state. This is needed if the STA 564 * reassociates back to the same AP while the previous entry for the 565 * STA has not yet been removed. */ 566 if (sm == NULL) 567 return; 568 569 sm->wpa_key_mgmt = 0; 570} 571 572 573static void wpa_free_sta_sm(struct wpa_state_machine *sm) 574{ 575 if (sm->GUpdateStationKeys) { 576 sm->group->GKeyDoneStations--; 577 sm->GUpdateStationKeys = FALSE; 578 } 579#ifdef CONFIG_IEEE80211R 580 os_free(sm->assoc_resp_ftie); 581#endif /* CONFIG_IEEE80211R */ 582 os_free(sm->last_rx_eapol_key); 583 os_free(sm->wpa_ie); 584 os_free(sm); 585} 586 587 588void wpa_auth_sta_deinit(struct wpa_state_machine *sm) 589{ 590 if (sm == NULL) 591 return; 592 593 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { 594 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 595 "strict rekeying - force GTK rekey since STA " 596 "is leaving"); 597 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); 598 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, 599 NULL); 600 } 601 602 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 603 sm->pending_1_of_4_timeout = 0; 604 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); 605 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 606 if (sm->in_step_loop) { 607 /* Must not free state machine while wpa_sm_step() is running. 608 * Freeing will be completed in the end of wpa_sm_step(). */ 609 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " 610 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 611 sm->pending_deinit = 1; 612 } else 613 wpa_free_sta_sm(sm); 614} 615 616 617static void wpa_request_new_ptk(struct wpa_state_machine *sm) 618{ 619 if (sm == NULL) 620 return; 621 622 sm->PTKRequest = TRUE; 623 sm->PTK_valid = 0; 624} 625 626 627static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, 628 const u8 *replay_counter) 629{ 630 int i; 631 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 632 if (!ctr[i].valid) 633 break; 634 if (os_memcmp(replay_counter, ctr[i].counter, 635 WPA_REPLAY_COUNTER_LEN) == 0) 636 return 1; 637 } 638 return 0; 639} 640 641 642static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, 643 const u8 *replay_counter) 644{ 645 int i; 646 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 647 if (ctr[i].valid && 648 (replay_counter == NULL || 649 os_memcmp(replay_counter, ctr[i].counter, 650 WPA_REPLAY_COUNTER_LEN) == 0)) 651 ctr[i].valid = FALSE; 652 } 653} 654 655 656#ifdef CONFIG_IEEE80211R 657static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, 658 struct wpa_state_machine *sm, 659 struct wpa_eapol_ie_parse *kde) 660{ 661 struct wpa_ie_data ie; 662 struct rsn_mdie *mdie; 663 664 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || 665 ie.num_pmkid != 1 || ie.pmkid == NULL) { 666 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " 667 "FT 4-way handshake message 2/4"); 668 return -1; 669 } 670 671 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); 672 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", 673 sm->sup_pmk_r1_name, PMKID_LEN); 674 675 if (!kde->mdie || !kde->ftie) { 676 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " 677 "message 2/4", kde->mdie ? "FTIE" : "MDIE"); 678 return -1; 679 } 680 681 mdie = (struct rsn_mdie *) (kde->mdie + 2); 682 if (kde->mdie[1] < sizeof(struct rsn_mdie) || 683 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, 684 MOBILITY_DOMAIN_ID_LEN) != 0) { 685 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); 686 return -1; 687 } 688 689 if (sm->assoc_resp_ftie && 690 (kde->ftie[1] != sm->assoc_resp_ftie[1] || 691 os_memcmp(kde->ftie, sm->assoc_resp_ftie, 692 2 + sm->assoc_resp_ftie[1]) != 0)) { 693 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); 694 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", 695 kde->ftie, kde->ftie_len); 696 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", 697 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); 698 return -1; 699 } 700 701 return 0; 702} 703#endif /* CONFIG_IEEE80211R */ 704 705 706static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth, 707 struct wpa_state_machine *sm, int group) 708{ 709 /* Supplicant reported a Michael MIC error */ 710 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 711 "received EAPOL-Key Error Request " 712 "(STA detected Michael MIC failure (group=%d))", 713 group); 714 715 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { 716 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 717 "ignore Michael MIC failure report since " 718 "group cipher is not TKIP"); 719 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { 720 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 721 "ignore Michael MIC failure report since " 722 "pairwise cipher is not TKIP"); 723 } else { 724 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0) 725 return 1; /* STA entry was removed */ 726 sm->dot11RSNAStatsTKIPRemoteMICFailures++; 727 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; 728 } 729 730 /* 731 * Error report is not a request for a new key handshake, but since 732 * Authenticator may do it, let's change the keys now anyway. 733 */ 734 wpa_request_new_ptk(sm); 735 return 0; 736} 737 738 739void wpa_receive(struct wpa_authenticator *wpa_auth, 740 struct wpa_state_machine *sm, 741 u8 *data, size_t data_len) 742{ 743 struct ieee802_1x_hdr *hdr; 744 struct wpa_eapol_key *key; 745 u16 key_info, key_data_length; 746 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, 747 SMK_M1, SMK_M3, SMK_ERROR } msg; 748 char *msgtxt; 749 struct wpa_eapol_ie_parse kde; 750 int ft; 751 const u8 *eapol_key_ie; 752 size_t eapol_key_ie_len; 753 754 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 755 return; 756 757 if (data_len < sizeof(*hdr) + sizeof(*key)) 758 return; 759 760 hdr = (struct ieee802_1x_hdr *) data; 761 key = (struct wpa_eapol_key *) (hdr + 1); 762 key_info = WPA_GET_BE16(key->key_info); 763 key_data_length = WPA_GET_BE16(key->key_data_length); 764 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR 765 " key_info=0x%x type=%u key_data_length=%u", 766 MAC2STR(sm->addr), key_info, key->type, key_data_length); 767 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) { 768 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " 769 "key_data overflow (%d > %lu)", 770 key_data_length, 771 (unsigned long) (data_len - sizeof(*hdr) - 772 sizeof(*key))); 773 return; 774 } 775 776 if (sm->wpa == WPA_VERSION_WPA2) { 777 if (key->type == EAPOL_KEY_TYPE_WPA) { 778 /* 779 * Some deployed station implementations seem to send 780 * msg 4/4 with incorrect type value in WPA2 mode. 781 */ 782 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " 783 "with unexpected WPA type in RSN mode"); 784 } else if (key->type != EAPOL_KEY_TYPE_RSN) { 785 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 786 "unexpected type %d in RSN mode", 787 key->type); 788 return; 789 } 790 } else { 791 if (key->type != EAPOL_KEY_TYPE_WPA) { 792 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 793 "unexpected type %d in WPA mode", 794 key->type); 795 return; 796 } 797 } 798 799 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, 800 WPA_NONCE_LEN); 801 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", 802 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 803 804 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys 805 * are set */ 806 807 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == 808 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { 809 if (key_info & WPA_KEY_INFO_ERROR) { 810 msg = SMK_ERROR; 811 msgtxt = "SMK Error"; 812 } else { 813 msg = SMK_M1; 814 msgtxt = "SMK M1"; 815 } 816 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 817 msg = SMK_M3; 818 msgtxt = "SMK M3"; 819 } else if (key_info & WPA_KEY_INFO_REQUEST) { 820 msg = REQUEST; 821 msgtxt = "Request"; 822 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { 823 msg = GROUP_2; 824 msgtxt = "2/2 Group"; 825 } else if (key_data_length == 0) { 826 msg = PAIRWISE_4; 827 msgtxt = "4/4 Pairwise"; 828 } else { 829 msg = PAIRWISE_2; 830 msgtxt = "2/4 Pairwise"; 831 } 832 833 /* TODO: key_info type validation for PeerKey */ 834 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || 835 msg == GROUP_2) { 836 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 837 if (sm->pairwise == WPA_CIPHER_CCMP || 838 sm->pairwise == WPA_CIPHER_GCMP) { 839 if (wpa_use_aes_cmac(sm) && 840 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 841 wpa_auth_logger(wpa_auth, sm->addr, 842 LOGGER_WARNING, 843 "advertised support for " 844 "AES-128-CMAC, but did not " 845 "use it"); 846 return; 847 } 848 849 if (!wpa_use_aes_cmac(sm) && 850 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 851 wpa_auth_logger(wpa_auth, sm->addr, 852 LOGGER_WARNING, 853 "did not use HMAC-SHA1-AES " 854 "with CCMP/GCMP"); 855 return; 856 } 857 } 858 } 859 860 if (key_info & WPA_KEY_INFO_REQUEST) { 861 if (sm->req_replay_counter_used && 862 os_memcmp(key->replay_counter, sm->req_replay_counter, 863 WPA_REPLAY_COUNTER_LEN) <= 0) { 864 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 865 "received EAPOL-Key request with " 866 "replayed counter"); 867 return; 868 } 869 } 870 871 if (!(key_info & WPA_KEY_INFO_REQUEST) && 872 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { 873 int i; 874 875 if (msg == PAIRWISE_2 && 876 wpa_replay_counter_valid(sm->prev_key_replay, 877 key->replay_counter) && 878 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 879 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) 880 { 881 /* 882 * Some supplicant implementations (e.g., Windows XP 883 * WZC) update SNonce for each EAPOL-Key 2/4. This 884 * breaks the workaround on accepting any of the 885 * pending requests, so allow the SNonce to be updated 886 * even if we have already sent out EAPOL-Key 3/4. 887 */ 888 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 889 "Process SNonce update from STA " 890 "based on retransmitted EAPOL-Key " 891 "1/4"); 892 sm->update_snonce = 1; 893 wpa_replay_counter_mark_invalid(sm->prev_key_replay, 894 key->replay_counter); 895 goto continue_processing; 896 } 897 898 if (msg == PAIRWISE_2 && 899 wpa_replay_counter_valid(sm->prev_key_replay, 900 key->replay_counter) && 901 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { 902 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 903 "ignore retransmitted EAPOL-Key %s - " 904 "SNonce did not change", msgtxt); 905 } else { 906 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 907 "received EAPOL-Key %s with " 908 "unexpected replay counter", msgtxt); 909 } 910 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 911 if (!sm->key_replay[i].valid) 912 break; 913 wpa_hexdump(MSG_DEBUG, "pending replay counter", 914 sm->key_replay[i].counter, 915 WPA_REPLAY_COUNTER_LEN); 916 } 917 wpa_hexdump(MSG_DEBUG, "received replay counter", 918 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 919 return; 920 } 921 922continue_processing: 923 switch (msg) { 924 case PAIRWISE_2: 925 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && 926 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && 927 (!sm->update_snonce || 928 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { 929 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 930 "received EAPOL-Key msg 2/4 in " 931 "invalid state (%d) - dropped", 932 sm->wpa_ptk_state); 933 return; 934 } 935 random_add_randomness(key->key_nonce, WPA_NONCE_LEN); 936 if (sm->group->reject_4way_hs_for_entropy) { 937 /* 938 * The system did not have enough entropy to generate 939 * strong random numbers. Reject the first 4-way 940 * handshake(s) and collect some entropy based on the 941 * information from it. Once enough entropy is 942 * available, the next atempt will trigger GMK/Key 943 * Counter update and the station will be allowed to 944 * continue. 945 */ 946 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " 947 "collect more entropy for random number " 948 "generation"); 949 random_mark_pool_ready(); 950 wpa_sta_disconnect(wpa_auth, sm->addr); 951 return; 952 } 953 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length, 954 &kde) < 0) { 955 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 956 "received EAPOL-Key msg 2/4 with " 957 "invalid Key Data contents"); 958 return; 959 } 960 if (kde.rsn_ie) { 961 eapol_key_ie = kde.rsn_ie; 962 eapol_key_ie_len = kde.rsn_ie_len; 963 } else { 964 eapol_key_ie = kde.wpa_ie; 965 eapol_key_ie_len = kde.wpa_ie_len; 966 } 967 ft = sm->wpa == WPA_VERSION_WPA2 && 968 wpa_key_mgmt_ft(sm->wpa_key_mgmt); 969 if (sm->wpa_ie == NULL || 970 wpa_compare_rsn_ie(ft, 971 sm->wpa_ie, sm->wpa_ie_len, 972 eapol_key_ie, eapol_key_ie_len)) { 973 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 974 "WPA IE from (Re)AssocReq did not " 975 "match with msg 2/4"); 976 if (sm->wpa_ie) { 977 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", 978 sm->wpa_ie, sm->wpa_ie_len); 979 } 980 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", 981 eapol_key_ie, eapol_key_ie_len); 982 /* MLME-DEAUTHENTICATE.request */ 983 wpa_sta_disconnect(wpa_auth, sm->addr); 984 return; 985 } 986#ifdef CONFIG_IEEE80211R 987 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { 988 wpa_sta_disconnect(wpa_auth, sm->addr); 989 return; 990 } 991#endif /* CONFIG_IEEE80211R */ 992 break; 993 case PAIRWISE_4: 994 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || 995 !sm->PTK_valid) { 996 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 997 "received EAPOL-Key msg 4/4 in " 998 "invalid state (%d) - dropped", 999 sm->wpa_ptk_state); 1000 return; 1001 } 1002 break; 1003 case GROUP_2: 1004 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING 1005 || !sm->PTK_valid) { 1006 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1007 "received EAPOL-Key msg 2/2 in " 1008 "invalid state (%d) - dropped", 1009 sm->wpa_ptk_group_state); 1010 return; 1011 } 1012 break; 1013#ifdef CONFIG_PEERKEY 1014 case SMK_M1: 1015 case SMK_M3: 1016 case SMK_ERROR: 1017 if (!wpa_auth->conf.peerkey) { 1018 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " 1019 "PeerKey use disabled - ignoring message"); 1020 return; 1021 } 1022 if (!sm->PTK_valid) { 1023 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1024 "received EAPOL-Key msg SMK in " 1025 "invalid state - dropped"); 1026 return; 1027 } 1028 break; 1029#else /* CONFIG_PEERKEY */ 1030 case SMK_M1: 1031 case SMK_M3: 1032 case SMK_ERROR: 1033 return; /* STSL disabled - ignore SMK messages */ 1034#endif /* CONFIG_PEERKEY */ 1035 case REQUEST: 1036 break; 1037 } 1038 1039 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1040 "received EAPOL-Key frame (%s)", msgtxt); 1041 1042 if (key_info & WPA_KEY_INFO_ACK) { 1043 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1044 "received invalid EAPOL-Key: Key Ack set"); 1045 return; 1046 } 1047 1048 if (!(key_info & WPA_KEY_INFO_MIC)) { 1049 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1050 "received invalid EAPOL-Key: Key MIC not set"); 1051 return; 1052 } 1053 1054 sm->MICVerified = FALSE; 1055 if (sm->PTK_valid && !sm->update_snonce) { 1056 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) { 1057 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1058 "received EAPOL-Key with invalid MIC"); 1059 return; 1060 } 1061 sm->MICVerified = TRUE; 1062 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 1063 sm->pending_1_of_4_timeout = 0; 1064 } 1065 1066 if (key_info & WPA_KEY_INFO_REQUEST) { 1067 if (sm->MICVerified) { 1068 sm->req_replay_counter_used = 1; 1069 os_memcpy(sm->req_replay_counter, key->replay_counter, 1070 WPA_REPLAY_COUNTER_LEN); 1071 } else { 1072 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1073 "received EAPOL-Key request with " 1074 "invalid MIC"); 1075 return; 1076 } 1077 1078 /* 1079 * TODO: should decrypt key data field if encryption was used; 1080 * even though MAC address KDE is not normally encrypted, 1081 * supplicant is allowed to encrypt it. 1082 */ 1083 if (msg == SMK_ERROR) { 1084#ifdef CONFIG_PEERKEY 1085 wpa_smk_error(wpa_auth, sm, key); 1086#endif /* CONFIG_PEERKEY */ 1087 return; 1088 } else if (key_info & WPA_KEY_INFO_ERROR) { 1089 if (wpa_receive_error_report( 1090 wpa_auth, sm, 1091 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0) 1092 return; /* STA entry was removed */ 1093 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1094 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1095 "received EAPOL-Key Request for new " 1096 "4-Way Handshake"); 1097 wpa_request_new_ptk(sm); 1098#ifdef CONFIG_PEERKEY 1099 } else if (msg == SMK_M1) { 1100 wpa_smk_m1(wpa_auth, sm, key); 1101#endif /* CONFIG_PEERKEY */ 1102 } else if (key_data_length > 0 && 1103 wpa_parse_kde_ies((const u8 *) (key + 1), 1104 key_data_length, &kde) == 0 && 1105 kde.mac_addr) { 1106 } else { 1107 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1108 "received EAPOL-Key Request for GTK " 1109 "rekeying"); 1110 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 1111 wpa_rekey_gtk(wpa_auth, NULL); 1112 } 1113 } else { 1114 /* Do not allow the same key replay counter to be reused. */ 1115 wpa_replay_counter_mark_invalid(sm->key_replay, 1116 key->replay_counter); 1117 1118 if (msg == PAIRWISE_2) { 1119 /* 1120 * Maintain a copy of the pending EAPOL-Key frames in 1121 * case the EAPOL-Key frame was retransmitted. This is 1122 * needed to allow EAPOL-Key msg 2/4 reply to another 1123 * pending msg 1/4 to update the SNonce to work around 1124 * unexpected supplicant behavior. 1125 */ 1126 os_memcpy(sm->prev_key_replay, sm->key_replay, 1127 sizeof(sm->key_replay)); 1128 } else { 1129 os_memset(sm->prev_key_replay, 0, 1130 sizeof(sm->prev_key_replay)); 1131 } 1132 1133 /* 1134 * Make sure old valid counters are not accepted anymore and 1135 * do not get copied again. 1136 */ 1137 wpa_replay_counter_mark_invalid(sm->key_replay, NULL); 1138 } 1139 1140#ifdef CONFIG_PEERKEY 1141 if (msg == SMK_M3) { 1142 wpa_smk_m3(wpa_auth, sm, key); 1143 return; 1144 } 1145#endif /* CONFIG_PEERKEY */ 1146 1147 os_free(sm->last_rx_eapol_key); 1148 sm->last_rx_eapol_key = os_malloc(data_len); 1149 if (sm->last_rx_eapol_key == NULL) 1150 return; 1151 os_memcpy(sm->last_rx_eapol_key, data, data_len); 1152 sm->last_rx_eapol_key_len = data_len; 1153 1154 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); 1155 sm->EAPOLKeyReceived = TRUE; 1156 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1157 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); 1158 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); 1159 wpa_sm_step(sm); 1160} 1161 1162 1163static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, 1164 const u8 *gnonce, u8 *gtk, size_t gtk_len) 1165{ 1166 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; 1167 u8 *pos; 1168 int ret = 0; 1169 1170 /* GTK = PRF-X(GMK, "Group key expansion", 1171 * AA || GNonce || Time || random data) 1172 * The example described in the IEEE 802.11 standard uses only AA and 1173 * GNonce as inputs here. Add some more entropy since this derivation 1174 * is done only at the Authenticator and as such, does not need to be 1175 * exactly same. 1176 */ 1177 os_memcpy(data, addr, ETH_ALEN); 1178 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); 1179 pos = data + ETH_ALEN + WPA_NONCE_LEN; 1180 wpa_get_ntp_timestamp(pos); 1181 pos += 8; 1182 if (random_get_bytes(pos, 16) < 0) 1183 ret = -1; 1184 1185#ifdef CONFIG_IEEE80211W 1186 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); 1187#else /* CONFIG_IEEE80211W */ 1188 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) 1189 < 0) 1190 ret = -1; 1191#endif /* CONFIG_IEEE80211W */ 1192 1193 return ret; 1194} 1195 1196 1197static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) 1198{ 1199 struct wpa_authenticator *wpa_auth = eloop_ctx; 1200 struct wpa_state_machine *sm = timeout_ctx; 1201 1202 sm->pending_1_of_4_timeout = 0; 1203 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); 1204 sm->TimeoutEvt = TRUE; 1205 wpa_sm_step(sm); 1206} 1207 1208 1209void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1210 struct wpa_state_machine *sm, int key_info, 1211 const u8 *key_rsc, const u8 *nonce, 1212 const u8 *kde, size_t kde_len, 1213 int keyidx, int encr, int force_version) 1214{ 1215 struct ieee802_1x_hdr *hdr; 1216 struct wpa_eapol_key *key; 1217 size_t len; 1218 int alg; 1219 int key_data_len, pad_len = 0; 1220 u8 *buf, *pos; 1221 int version, pairwise; 1222 int i; 1223 1224 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key); 1225 1226 if (force_version) 1227 version = force_version; 1228 else if (wpa_use_aes_cmac(sm)) 1229 version = WPA_KEY_INFO_TYPE_AES_128_CMAC; 1230 else if (sm->pairwise != WPA_CIPHER_TKIP) 1231 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 1232 else 1233 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 1234 1235 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1236 1237 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " 1238 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " 1239 "encr=%d)", 1240 version, 1241 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, 1242 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, 1243 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, 1244 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, 1245 pairwise, (unsigned long) kde_len, keyidx, encr); 1246 1247 key_data_len = kde_len; 1248 1249 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1250 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { 1251 pad_len = key_data_len % 8; 1252 if (pad_len) 1253 pad_len = 8 - pad_len; 1254 key_data_len += pad_len + 8; 1255 } 1256 1257 len += key_data_len; 1258 1259 hdr = os_zalloc(len); 1260 if (hdr == NULL) 1261 return; 1262 hdr->version = wpa_auth->conf.eapol_version; 1263 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; 1264 hdr->length = host_to_be16(len - sizeof(*hdr)); 1265 key = (struct wpa_eapol_key *) (hdr + 1); 1266 1267 key->type = sm->wpa == WPA_VERSION_WPA2 ? 1268 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1269 key_info |= version; 1270 if (encr && sm->wpa == WPA_VERSION_WPA2) 1271 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1272 if (sm->wpa != WPA_VERSION_WPA2) 1273 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; 1274 WPA_PUT_BE16(key->key_info, key_info); 1275 1276 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; 1277 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); 1278 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) 1279 WPA_PUT_BE16(key->key_length, 0); 1280 1281 /* FIX: STSL: what to use as key_replay_counter? */ 1282 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { 1283 sm->key_replay[i].valid = sm->key_replay[i - 1].valid; 1284 os_memcpy(sm->key_replay[i].counter, 1285 sm->key_replay[i - 1].counter, 1286 WPA_REPLAY_COUNTER_LEN); 1287 } 1288 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); 1289 os_memcpy(key->replay_counter, sm->key_replay[0].counter, 1290 WPA_REPLAY_COUNTER_LEN); 1291 sm->key_replay[0].valid = TRUE; 1292 1293 if (nonce) 1294 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); 1295 1296 if (key_rsc) 1297 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); 1298 1299 if (kde && !encr) { 1300 os_memcpy(key + 1, kde, kde_len); 1301 WPA_PUT_BE16(key->key_data_length, kde_len); 1302 } else if (encr && kde) { 1303 buf = os_zalloc(key_data_len); 1304 if (buf == NULL) { 1305 os_free(hdr); 1306 return; 1307 } 1308 pos = buf; 1309 os_memcpy(pos, kde, kde_len); 1310 pos += kde_len; 1311 1312 if (pad_len) 1313 *pos++ = 0xdd; 1314 1315 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", 1316 buf, key_data_len); 1317 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1318 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1319 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf, 1320 (u8 *) (key + 1))) { 1321 os_free(hdr); 1322 os_free(buf); 1323 return; 1324 } 1325 WPA_PUT_BE16(key->key_data_length, key_data_len); 1326 } else { 1327 u8 ek[32]; 1328 os_memcpy(key->key_iv, 1329 sm->group->Counter + WPA_NONCE_LEN - 16, 16); 1330 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); 1331 os_memcpy(ek, key->key_iv, 16); 1332 os_memcpy(ek + 16, sm->PTK.kek, 16); 1333 os_memcpy(key + 1, buf, key_data_len); 1334 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len); 1335 WPA_PUT_BE16(key->key_data_length, key_data_len); 1336 } 1337 os_free(buf); 1338 } 1339 1340 if (key_info & WPA_KEY_INFO_MIC) { 1341 if (!sm->PTK_valid) { 1342 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 1343 "PTK not valid when sending EAPOL-Key " 1344 "frame"); 1345 os_free(hdr); 1346 return; 1347 } 1348 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len, 1349 key->key_mic); 1350#ifdef CONFIG_TESTING_OPTIONS 1351 if (!pairwise && 1352 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0d && 1353 drand48() < 1354 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { 1355 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1356 "Corrupting group EAPOL-Key Key MIC"); 1357 key->key_mic[0]++; 1358 } 1359#endif /* CONFIG_TESTING_OPTIONS */ 1360 } 1361 1362 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, 1363 1); 1364 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, 1365 sm->pairwise_set); 1366 os_free(hdr); 1367} 1368 1369 1370static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1371 struct wpa_state_machine *sm, int key_info, 1372 const u8 *key_rsc, const u8 *nonce, 1373 const u8 *kde, size_t kde_len, 1374 int keyidx, int encr) 1375{ 1376 int timeout_ms; 1377 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; 1378 int ctr; 1379 1380 if (sm == NULL) 1381 return; 1382 1383 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, 1384 keyidx, encr, 0); 1385 1386 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; 1387 if (ctr == 1 && wpa_auth->conf.tx_status) 1388 timeout_ms = pairwise ? eapol_key_timeout_first : 1389 eapol_key_timeout_first_group; 1390 else 1391 timeout_ms = eapol_key_timeout_subseq; 1392 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) 1393 sm->pending_1_of_4_timeout = 1; 1394 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " 1395 "counter %d)", timeout_ms, ctr); 1396 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, 1397 wpa_send_eapol_timeout, wpa_auth, sm); 1398} 1399 1400 1401static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len) 1402{ 1403 struct ieee802_1x_hdr *hdr; 1404 struct wpa_eapol_key *key; 1405 u16 key_info; 1406 int ret = 0; 1407 u8 mic[16]; 1408 1409 if (data_len < sizeof(*hdr) + sizeof(*key)) 1410 return -1; 1411 1412 hdr = (struct ieee802_1x_hdr *) data; 1413 key = (struct wpa_eapol_key *) (hdr + 1); 1414 key_info = WPA_GET_BE16(key->key_info); 1415 os_memcpy(mic, key->key_mic, 16); 1416 os_memset(key->key_mic, 0, 16); 1417 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK, 1418 data, data_len, key->key_mic) || 1419 os_memcmp(mic, key->key_mic, 16) != 0) 1420 ret = -1; 1421 os_memcpy(key->key_mic, mic, 16); 1422 return ret; 1423} 1424 1425 1426void wpa_remove_ptk(struct wpa_state_machine *sm) 1427{ 1428 sm->PTK_valid = FALSE; 1429 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1430 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); 1431 sm->pairwise_set = FALSE; 1432 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 1433} 1434 1435 1436int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event) 1437{ 1438 int remove_ptk = 1; 1439 1440 if (sm == NULL) 1441 return -1; 1442 1443 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1444 "event %d notification", event); 1445 1446 switch (event) { 1447 case WPA_AUTH: 1448 case WPA_ASSOC: 1449 break; 1450 case WPA_DEAUTH: 1451 case WPA_DISASSOC: 1452 sm->DeauthenticationRequest = TRUE; 1453 break; 1454 case WPA_REAUTH: 1455 case WPA_REAUTH_EAPOL: 1456 if (!sm->started) { 1457 /* 1458 * When using WPS, we may end up here if the STA 1459 * manages to re-associate without the previous STA 1460 * entry getting removed. Consequently, we need to make 1461 * sure that the WPA state machines gets initialized 1462 * properly at this point. 1463 */ 1464 wpa_printf(MSG_DEBUG, "WPA state machine had not been " 1465 "started - initialize now"); 1466 sm->started = 1; 1467 sm->Init = TRUE; 1468 if (wpa_sm_step(sm) == 1) 1469 return 1; /* should not really happen */ 1470 sm->Init = FALSE; 1471 sm->AuthenticationRequest = TRUE; 1472 break; 1473 } 1474 if (sm->GUpdateStationKeys) { 1475 /* 1476 * Reauthentication cancels the pending group key 1477 * update for this STA. 1478 */ 1479 sm->group->GKeyDoneStations--; 1480 sm->GUpdateStationKeys = FALSE; 1481 sm->PtkGroupInit = TRUE; 1482 } 1483 sm->ReAuthenticationRequest = TRUE; 1484 break; 1485 case WPA_ASSOC_FT: 1486#ifdef CONFIG_IEEE80211R 1487 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " 1488 "after association"); 1489 wpa_ft_install_ptk(sm); 1490 1491 /* Using FT protocol, not WPA auth state machine */ 1492 sm->ft_completed = 1; 1493 return 0; 1494#else /* CONFIG_IEEE80211R */ 1495 break; 1496#endif /* CONFIG_IEEE80211R */ 1497 } 1498 1499#ifdef CONFIG_IEEE80211R 1500 sm->ft_completed = 0; 1501#endif /* CONFIG_IEEE80211R */ 1502 1503#ifdef CONFIG_IEEE80211W 1504 if (sm->mgmt_frame_prot && event == WPA_AUTH) 1505 remove_ptk = 0; 1506#endif /* CONFIG_IEEE80211W */ 1507 1508 if (remove_ptk) { 1509 sm->PTK_valid = FALSE; 1510 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1511 1512 if (event != WPA_REAUTH_EAPOL) 1513 wpa_remove_ptk(sm); 1514 } 1515 1516 return wpa_sm_step(sm); 1517} 1518 1519 1520SM_STATE(WPA_PTK, INITIALIZE) 1521{ 1522 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); 1523 if (sm->Init) { 1524 /* Init flag is not cleared here, so avoid busy 1525 * loop by claiming nothing changed. */ 1526 sm->changed = FALSE; 1527 } 1528 1529 sm->keycount = 0; 1530 if (sm->GUpdateStationKeys) 1531 sm->group->GKeyDoneStations--; 1532 sm->GUpdateStationKeys = FALSE; 1533 if (sm->wpa == WPA_VERSION_WPA) 1534 sm->PInitAKeys = FALSE; 1535 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and 1536 * Local AA > Remote AA)) */) { 1537 sm->Pair = TRUE; 1538 } 1539 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); 1540 wpa_remove_ptk(sm); 1541 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); 1542 sm->TimeoutCtr = 0; 1543 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1544 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 1545 WPA_EAPOL_authorized, 0); 1546 } 1547} 1548 1549 1550SM_STATE(WPA_PTK, DISCONNECT) 1551{ 1552 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); 1553 sm->Disconnect = FALSE; 1554 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 1555} 1556 1557 1558SM_STATE(WPA_PTK, DISCONNECTED) 1559{ 1560 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); 1561 sm->DeauthenticationRequest = FALSE; 1562} 1563 1564 1565SM_STATE(WPA_PTK, AUTHENTICATION) 1566{ 1567 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); 1568 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1569 sm->PTK_valid = FALSE; 1570 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, 1571 1); 1572 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); 1573 sm->AuthenticationRequest = FALSE; 1574} 1575 1576 1577static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, 1578 struct wpa_group *group) 1579{ 1580 if (group->first_sta_seen) 1581 return; 1582 /* 1583 * System has run bit further than at the time hostapd was started 1584 * potentially very early during boot up. This provides better chances 1585 * of collecting more randomness on embedded systems. Re-initialize the 1586 * GMK and Counter here to improve their strength if there was not 1587 * enough entropy available immediately after system startup. 1588 */ 1589 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " 1590 "station"); 1591 if (random_pool_ready() != 1) { 1592 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 1593 "to proceed - reject first 4-way handshake"); 1594 group->reject_4way_hs_for_entropy = TRUE; 1595 } else { 1596 group->first_sta_seen = TRUE; 1597 group->reject_4way_hs_for_entropy = FALSE; 1598 } 1599 1600 wpa_group_init_gmk_and_counter(wpa_auth, group); 1601 wpa_gtk_update(wpa_auth, group); 1602 wpa_group_config_group_keys(wpa_auth, group); 1603} 1604 1605 1606SM_STATE(WPA_PTK, AUTHENTICATION2) 1607{ 1608 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); 1609 1610 wpa_group_ensure_init(sm->wpa_auth, sm->group); 1611 sm->ReAuthenticationRequest = FALSE; 1612 1613 /* 1614 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat 1615 * ambiguous. The Authenticator state machine uses a counter that is 1616 * incremented by one for each 4-way handshake. However, the security 1617 * analysis of 4-way handshake points out that unpredictable nonces 1618 * help in preventing precomputation attacks. Instead of the state 1619 * machine definition, use an unpredictable nonce value here to provide 1620 * stronger protection against potential precomputation attacks. 1621 */ 1622 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1623 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " 1624 "ANonce."); 1625 sm->Disconnect = TRUE; 1626 return; 1627 } 1628 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, 1629 WPA_NONCE_LEN); 1630 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more 1631 * logical place than INITIALIZE since AUTHENTICATION2 can be 1632 * re-entered on ReAuthenticationRequest without going through 1633 * INITIALIZE. */ 1634 sm->TimeoutCtr = 0; 1635} 1636 1637 1638SM_STATE(WPA_PTK, INITPMK) 1639{ 1640 u8 msk[2 * PMK_LEN]; 1641 size_t len = 2 * PMK_LEN; 1642 1643 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); 1644#ifdef CONFIG_IEEE80211R 1645 sm->xxkey_len = 0; 1646#endif /* CONFIG_IEEE80211R */ 1647 if (sm->pmksa) { 1648 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); 1649 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); 1650 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { 1651 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " 1652 "(len=%lu)", (unsigned long) len); 1653 os_memcpy(sm->PMK, msk, PMK_LEN); 1654#ifdef CONFIG_IEEE80211R 1655 if (len >= 2 * PMK_LEN) { 1656 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); 1657 sm->xxkey_len = PMK_LEN; 1658 } 1659#endif /* CONFIG_IEEE80211R */ 1660 } else { 1661 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK"); 1662 } 1663 1664 sm->req_replay_counter_used = 0; 1665 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this 1666 * will break reauthentication since EAPOL state machines may not be 1667 * get into AUTHENTICATING state that clears keyRun before WPA state 1668 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK 1669 * state and takes PMK from the previously used AAA Key. This will 1670 * eventually fail in 4-Way Handshake because Supplicant uses PMK 1671 * derived from the new AAA Key. Setting keyRun = FALSE here seems to 1672 * be good workaround for this issue. */ 1673 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); 1674} 1675 1676 1677SM_STATE(WPA_PTK, INITPSK) 1678{ 1679 const u8 *psk; 1680 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); 1681 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL); 1682 if (psk) { 1683 os_memcpy(sm->PMK, psk, PMK_LEN); 1684#ifdef CONFIG_IEEE80211R 1685 os_memcpy(sm->xxkey, psk, PMK_LEN); 1686 sm->xxkey_len = PMK_LEN; 1687#endif /* CONFIG_IEEE80211R */ 1688 } 1689 sm->req_replay_counter_used = 0; 1690} 1691 1692 1693SM_STATE(WPA_PTK, PTKSTART) 1694{ 1695 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; 1696 size_t pmkid_len = 0; 1697 1698 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); 1699 sm->PTKRequest = FALSE; 1700 sm->TimeoutEvt = FALSE; 1701 1702 sm->TimeoutCtr++; 1703 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1704 /* No point in sending the EAPOL-Key - we will disconnect 1705 * immediately following this. */ 1706 return; 1707 } 1708 1709 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1710 "sending 1/4 msg of 4-Way Handshake"); 1711 /* 1712 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only 1713 * one possible PSK for this STA. 1714 */ 1715 if (sm->wpa == WPA_VERSION_WPA2 && 1716 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) { 1717 pmkid = buf; 1718 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 1719 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; 1720 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; 1721 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); 1722 if (sm->pmksa) 1723 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], 1724 sm->pmksa->pmkid, PMKID_LEN); 1725 else { 1726 /* 1727 * Calculate PMKID since no PMKSA cache entry was 1728 * available with pre-calculated PMKID. 1729 */ 1730 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, 1731 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], 1732 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1733 } 1734 } 1735 wpa_send_eapol(sm->wpa_auth, sm, 1736 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, 1737 sm->ANonce, pmkid, pmkid_len, 0, 0); 1738} 1739 1740 1741static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk, 1742 struct wpa_ptk *ptk) 1743{ 1744 size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64; 1745#ifdef CONFIG_IEEE80211R 1746 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 1747 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len); 1748#endif /* CONFIG_IEEE80211R */ 1749 1750 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", 1751 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce, 1752 (u8 *) ptk, ptk_len, 1753 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1754 1755 return 0; 1756} 1757 1758 1759SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) 1760{ 1761 struct wpa_ptk PTK; 1762 int ok = 0; 1763 const u8 *pmk = NULL; 1764 1765 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); 1766 sm->EAPOLKeyReceived = FALSE; 1767 sm->update_snonce = FALSE; 1768 1769 /* WPA with IEEE 802.1X: use the derived PMK from EAP 1770 * WPA-PSK: iterate through possible PSKs and select the one matching 1771 * the packet */ 1772 for (;;) { 1773 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1774 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk); 1775 if (pmk == NULL) 1776 break; 1777 } else 1778 pmk = sm->PMK; 1779 1780 wpa_derive_ptk(sm, pmk, &PTK); 1781 1782 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key, 1783 sm->last_rx_eapol_key_len) == 0) { 1784 ok = 1; 1785 break; 1786 } 1787 1788 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 1789 break; 1790 } 1791 1792 if (!ok) { 1793 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1794 "invalid MIC in msg 2/4 of 4-Way Handshake"); 1795 return; 1796 } 1797 1798#ifdef CONFIG_IEEE80211R 1799 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 1800 /* 1801 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches 1802 * with the value we derived. 1803 */ 1804 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name, 1805 WPA_PMK_NAME_LEN) != 0) { 1806 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1807 "PMKR1Name mismatch in FT 4-way " 1808 "handshake"); 1809 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " 1810 "Supplicant", 1811 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); 1812 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 1813 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 1814 return; 1815 } 1816 } 1817#endif /* CONFIG_IEEE80211R */ 1818 1819 sm->pending_1_of_4_timeout = 0; 1820 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 1821 1822 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1823 /* PSK may have changed from the previous choice, so update 1824 * state machine data based on whatever PSK was selected here. 1825 */ 1826 os_memcpy(sm->PMK, pmk, PMK_LEN); 1827 } 1828 1829 sm->MICVerified = TRUE; 1830 1831 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 1832 sm->PTK_valid = TRUE; 1833} 1834 1835 1836SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) 1837{ 1838 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); 1839 sm->TimeoutCtr = 0; 1840} 1841 1842 1843#ifdef CONFIG_IEEE80211W 1844 1845static int ieee80211w_kde_len(struct wpa_state_machine *sm) 1846{ 1847 if (sm->mgmt_frame_prot) { 1848 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde); 1849 } 1850 1851 return 0; 1852} 1853 1854 1855static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 1856{ 1857 struct wpa_igtk_kde igtk; 1858 struct wpa_group *gsm = sm->group; 1859 1860 if (!sm->mgmt_frame_prot) 1861 return pos; 1862 1863 igtk.keyid[0] = gsm->GN_igtk; 1864 igtk.keyid[1] = 0; 1865 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || 1866 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0) 1867 os_memset(igtk.pn, 0, sizeof(igtk.pn)); 1868 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); 1869 if (sm->wpa_auth->conf.disable_gtk) { 1870 /* 1871 * Provide unique random IGTK to each STA to prevent use of 1872 * IGTK in the BSS. 1873 */ 1874 if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0) 1875 return pos; 1876 } 1877 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, 1878 (const u8 *) &igtk, sizeof(igtk), NULL, 0); 1879 1880 return pos; 1881} 1882 1883#else /* CONFIG_IEEE80211W */ 1884 1885static int ieee80211w_kde_len(struct wpa_state_machine *sm) 1886{ 1887 return 0; 1888} 1889 1890 1891static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 1892{ 1893 return pos; 1894} 1895 1896#endif /* CONFIG_IEEE80211W */ 1897 1898 1899SM_STATE(WPA_PTK, PTKINITNEGOTIATING) 1900{ 1901 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; 1902 size_t gtk_len, kde_len; 1903 struct wpa_group *gsm = sm->group; 1904 u8 *wpa_ie; 1905 int wpa_ie_len, secure, keyidx, encr = 0; 1906 1907 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); 1908 sm->TimeoutEvt = FALSE; 1909 1910 sm->TimeoutCtr++; 1911 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1912 /* No point in sending the EAPOL-Key - we will disconnect 1913 * immediately following this. */ 1914 return; 1915 } 1916 1917 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], 1918 GTK[GN], IGTK, [FTIE], [TIE * 2]) 1919 */ 1920 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 1921 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 1922 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ 1923 wpa_ie = sm->wpa_auth->wpa_ie; 1924 wpa_ie_len = sm->wpa_auth->wpa_ie_len; 1925 if (sm->wpa == WPA_VERSION_WPA && 1926 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && 1927 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { 1928 /* WPA-only STA, remove RSN IE */ 1929 wpa_ie = wpa_ie + wpa_ie[1] + 2; 1930 wpa_ie_len = wpa_ie[1] + 2; 1931 } 1932 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1933 "sending 3/4 msg of 4-Way Handshake"); 1934 if (sm->wpa == WPA_VERSION_WPA2) { 1935 /* WPA2 send GTK in the 4-way handshake */ 1936 secure = 1; 1937 gtk = gsm->GTK[gsm->GN - 1]; 1938 gtk_len = gsm->GTK_len; 1939 if (sm->wpa_auth->conf.disable_gtk) { 1940 /* 1941 * Provide unique random GTK to each STA to prevent use 1942 * of GTK in the BSS. 1943 */ 1944 if (random_get_bytes(dummy_gtk, gtk_len) < 0) 1945 return; 1946 gtk = dummy_gtk; 1947 } 1948 keyidx = gsm->GN; 1949 _rsc = rsc; 1950 encr = 1; 1951 } else { 1952 /* WPA does not include GTK in msg 3/4 */ 1953 secure = 0; 1954 gtk = NULL; 1955 gtk_len = 0; 1956 keyidx = 0; 1957 _rsc = NULL; 1958 if (sm->rx_eapol_key_secure) { 1959 /* 1960 * It looks like Windows 7 supplicant tries to use 1961 * Secure bit in msg 2/4 after having reported Michael 1962 * MIC failure and it then rejects the 4-way handshake 1963 * if msg 3/4 does not set Secure bit. Work around this 1964 * by setting the Secure bit here even in the case of 1965 * WPA if the supplicant used it first. 1966 */ 1967 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1968 "STA used Secure bit in WPA msg 2/4 - " 1969 "set Secure for 3/4 as workaround"); 1970 secure = 1; 1971 } 1972 } 1973 1974 kde_len = wpa_ie_len + ieee80211w_kde_len(sm); 1975 if (gtk) 1976 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; 1977#ifdef CONFIG_IEEE80211R 1978 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 1979 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ 1980 kde_len += 300; /* FTIE + 2 * TIE */ 1981 } 1982#endif /* CONFIG_IEEE80211R */ 1983 kde = os_malloc(kde_len); 1984 if (kde == NULL) 1985 return; 1986 1987 pos = kde; 1988 os_memcpy(pos, wpa_ie, wpa_ie_len); 1989 pos += wpa_ie_len; 1990#ifdef CONFIG_IEEE80211R 1991 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 1992 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); 1993 if (res < 0) { 1994 wpa_printf(MSG_ERROR, "FT: Failed to insert " 1995 "PMKR1Name into RSN IE in EAPOL-Key data"); 1996 os_free(kde); 1997 return; 1998 } 1999 pos += res; 2000 } 2001#endif /* CONFIG_IEEE80211R */ 2002 if (gtk) { 2003 u8 hdr[2]; 2004 hdr[0] = keyidx & 0x03; 2005 hdr[1] = 0; 2006 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2007 gtk, gtk_len); 2008 } 2009 pos = ieee80211w_kde_add(sm, pos); 2010 2011#ifdef CONFIG_IEEE80211R 2012 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2013 int res; 2014 struct wpa_auth_config *conf; 2015 2016 conf = &sm->wpa_auth->conf; 2017 res = wpa_write_ftie(conf, conf->r0_key_holder, 2018 conf->r0_key_holder_len, 2019 NULL, NULL, pos, kde + kde_len - pos, 2020 NULL, 0); 2021 if (res < 0) { 2022 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " 2023 "into EAPOL-Key Key Data"); 2024 os_free(kde); 2025 return; 2026 } 2027 pos += res; 2028 2029 /* TIE[ReassociationDeadline] (TU) */ 2030 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2031 *pos++ = 5; 2032 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; 2033 WPA_PUT_LE32(pos, conf->reassociation_deadline); 2034 pos += 4; 2035 2036 /* TIE[KeyLifetime] (seconds) */ 2037 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2038 *pos++ = 5; 2039 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; 2040 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); 2041 pos += 4; 2042 } 2043#endif /* CONFIG_IEEE80211R */ 2044 2045 wpa_send_eapol(sm->wpa_auth, sm, 2046 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | 2047 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | 2048 WPA_KEY_INFO_KEY_TYPE, 2049 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); 2050 os_free(kde); 2051} 2052 2053 2054SM_STATE(WPA_PTK, PTKINITDONE) 2055{ 2056 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); 2057 sm->EAPOLKeyReceived = FALSE; 2058 if (sm->Pair) { 2059 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); 2060 int klen = wpa_cipher_key_len(sm->pairwise); 2061 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 2062 sm->PTK.tk1, klen)) { 2063 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 2064 return; 2065 } 2066 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 2067 sm->pairwise_set = TRUE; 2068 2069 if (sm->wpa_auth->conf.wpa_ptk_rekey) { 2070 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 2071 eloop_register_timeout(sm->wpa_auth->conf. 2072 wpa_ptk_rekey, 0, wpa_rekey_ptk, 2073 sm->wpa_auth, sm); 2074 } 2075 2076 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2077 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2078 WPA_EAPOL_authorized, 1); 2079 } 2080 } 2081 2082 if (0 /* IBSS == TRUE */) { 2083 sm->keycount++; 2084 if (sm->keycount == 2) { 2085 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2086 WPA_EAPOL_portValid, 1); 2087 } 2088 } else { 2089 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 2090 1); 2091 } 2092 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); 2093 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); 2094 if (sm->wpa == WPA_VERSION_WPA) 2095 sm->PInitAKeys = TRUE; 2096 else 2097 sm->has_GTK = TRUE; 2098 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2099 "pairwise key handshake completed (%s)", 2100 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2101 2102#ifdef CONFIG_IEEE80211R 2103 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); 2104#endif /* CONFIG_IEEE80211R */ 2105} 2106 2107 2108SM_STEP(WPA_PTK) 2109{ 2110 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 2111 2112 if (sm->Init) 2113 SM_ENTER(WPA_PTK, INITIALIZE); 2114 else if (sm->Disconnect 2115 /* || FIX: dot11RSNAConfigSALifetime timeout */) { 2116 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 2117 "WPA_PTK: sm->Disconnect"); 2118 SM_ENTER(WPA_PTK, DISCONNECT); 2119 } 2120 else if (sm->DeauthenticationRequest) 2121 SM_ENTER(WPA_PTK, DISCONNECTED); 2122 else if (sm->AuthenticationRequest) 2123 SM_ENTER(WPA_PTK, AUTHENTICATION); 2124 else if (sm->ReAuthenticationRequest) 2125 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2126 else if (sm->PTKRequest) 2127 SM_ENTER(WPA_PTK, PTKSTART); 2128 else switch (sm->wpa_ptk_state) { 2129 case WPA_PTK_INITIALIZE: 2130 break; 2131 case WPA_PTK_DISCONNECT: 2132 SM_ENTER(WPA_PTK, DISCONNECTED); 2133 break; 2134 case WPA_PTK_DISCONNECTED: 2135 SM_ENTER(WPA_PTK, INITIALIZE); 2136 break; 2137 case WPA_PTK_AUTHENTICATION: 2138 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2139 break; 2140 case WPA_PTK_AUTHENTICATION2: 2141 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 2142 wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2143 WPA_EAPOL_keyRun) > 0) 2144 SM_ENTER(WPA_PTK, INITPMK); 2145 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) 2146 /* FIX: && 802.1X::keyRun */) 2147 SM_ENTER(WPA_PTK, INITPSK); 2148 break; 2149 case WPA_PTK_INITPMK: 2150 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2151 WPA_EAPOL_keyAvailable) > 0) 2152 SM_ENTER(WPA_PTK, PTKSTART); 2153 else { 2154 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2155 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2156 "INITPMK - keyAvailable = false"); 2157 SM_ENTER(WPA_PTK, DISCONNECT); 2158 } 2159 break; 2160 case WPA_PTK_INITPSK: 2161 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL)) 2162 SM_ENTER(WPA_PTK, PTKSTART); 2163 else { 2164 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2165 "no PSK configured for the STA"); 2166 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2167 SM_ENTER(WPA_PTK, DISCONNECT); 2168 } 2169 break; 2170 case WPA_PTK_PTKSTART: 2171 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2172 sm->EAPOLKeyPairwise) 2173 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2174 else if (sm->TimeoutCtr > 2175 (int) dot11RSNAConfigPairwiseUpdateCount) { 2176 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2177 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2178 "PTKSTART: Retry limit %d reached", 2179 dot11RSNAConfigPairwiseUpdateCount); 2180 SM_ENTER(WPA_PTK, DISCONNECT); 2181 } else if (sm->TimeoutEvt) 2182 SM_ENTER(WPA_PTK, PTKSTART); 2183 break; 2184 case WPA_PTK_PTKCALCNEGOTIATING: 2185 if (sm->MICVerified) 2186 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); 2187 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2188 sm->EAPOLKeyPairwise) 2189 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2190 else if (sm->TimeoutEvt) 2191 SM_ENTER(WPA_PTK, PTKSTART); 2192 break; 2193 case WPA_PTK_PTKCALCNEGOTIATING2: 2194 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2195 break; 2196 case WPA_PTK_PTKINITNEGOTIATING: 2197 if (sm->update_snonce) 2198 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2199 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2200 sm->EAPOLKeyPairwise && sm->MICVerified) 2201 SM_ENTER(WPA_PTK, PTKINITDONE); 2202 else if (sm->TimeoutCtr > 2203 (int) dot11RSNAConfigPairwiseUpdateCount) { 2204 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2205 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2206 "PTKINITNEGOTIATING: Retry limit %d " 2207 "reached", 2208 dot11RSNAConfigPairwiseUpdateCount); 2209 SM_ENTER(WPA_PTK, DISCONNECT); 2210 } else if (sm->TimeoutEvt) 2211 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2212 break; 2213 case WPA_PTK_PTKINITDONE: 2214 break; 2215 } 2216} 2217 2218 2219SM_STATE(WPA_PTK_GROUP, IDLE) 2220{ 2221 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); 2222 if (sm->Init) { 2223 /* Init flag is not cleared here, so avoid busy 2224 * loop by claiming nothing changed. */ 2225 sm->changed = FALSE; 2226 } 2227 sm->GTimeoutCtr = 0; 2228} 2229 2230 2231SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) 2232{ 2233 u8 rsc[WPA_KEY_RSC_LEN]; 2234 struct wpa_group *gsm = sm->group; 2235 u8 *kde, *pos, hdr[2]; 2236 size_t kde_len; 2237 u8 *gtk, dummy_gtk[32]; 2238 2239 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); 2240 2241 sm->GTimeoutCtr++; 2242 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { 2243 /* No point in sending the EAPOL-Key - we will disconnect 2244 * immediately following this. */ 2245 return; 2246 } 2247 2248 if (sm->wpa == WPA_VERSION_WPA) 2249 sm->PInitAKeys = FALSE; 2250 sm->TimeoutEvt = FALSE; 2251 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ 2252 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2253 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) 2254 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2255 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2256 "sending 1/2 msg of Group Key Handshake"); 2257 2258 gtk = gsm->GTK[gsm->GN - 1]; 2259 if (sm->wpa_auth->conf.disable_gtk) { 2260 /* 2261 * Provide unique random GTK to each STA to prevent use 2262 * of GTK in the BSS. 2263 */ 2264 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) 2265 return; 2266 gtk = dummy_gtk; 2267 } 2268 if (sm->wpa == WPA_VERSION_WPA2) { 2269 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + 2270 ieee80211w_kde_len(sm); 2271 kde = os_malloc(kde_len); 2272 if (kde == NULL) 2273 return; 2274 2275 pos = kde; 2276 hdr[0] = gsm->GN & 0x03; 2277 hdr[1] = 0; 2278 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2279 gtk, gsm->GTK_len); 2280 pos = ieee80211w_kde_add(sm, pos); 2281 } else { 2282 kde = gtk; 2283 pos = kde + gsm->GTK_len; 2284 } 2285 2286 wpa_send_eapol(sm->wpa_auth, sm, 2287 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | 2288 WPA_KEY_INFO_ACK | 2289 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), 2290 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1); 2291 if (sm->wpa == WPA_VERSION_WPA2) 2292 os_free(kde); 2293} 2294 2295 2296SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) 2297{ 2298 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); 2299 sm->EAPOLKeyReceived = FALSE; 2300 if (sm->GUpdateStationKeys) 2301 sm->group->GKeyDoneStations--; 2302 sm->GUpdateStationKeys = FALSE; 2303 sm->GTimeoutCtr = 0; 2304 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ 2305 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2306 "group key handshake completed (%s)", 2307 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2308 sm->has_GTK = TRUE; 2309} 2310 2311 2312SM_STATE(WPA_PTK_GROUP, KEYERROR) 2313{ 2314 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); 2315 if (sm->GUpdateStationKeys) 2316 sm->group->GKeyDoneStations--; 2317 sm->GUpdateStationKeys = FALSE; 2318 sm->Disconnect = TRUE; 2319} 2320 2321 2322SM_STEP(WPA_PTK_GROUP) 2323{ 2324 if (sm->Init || sm->PtkGroupInit) { 2325 SM_ENTER(WPA_PTK_GROUP, IDLE); 2326 sm->PtkGroupInit = FALSE; 2327 } else switch (sm->wpa_ptk_group_state) { 2328 case WPA_PTK_GROUP_IDLE: 2329 if (sm->GUpdateStationKeys || 2330 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) 2331 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2332 break; 2333 case WPA_PTK_GROUP_REKEYNEGOTIATING: 2334 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2335 !sm->EAPOLKeyPairwise && sm->MICVerified) 2336 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); 2337 else if (sm->GTimeoutCtr > 2338 (int) dot11RSNAConfigGroupUpdateCount) 2339 SM_ENTER(WPA_PTK_GROUP, KEYERROR); 2340 else if (sm->TimeoutEvt) 2341 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2342 break; 2343 case WPA_PTK_GROUP_KEYERROR: 2344 SM_ENTER(WPA_PTK_GROUP, IDLE); 2345 break; 2346 case WPA_PTK_GROUP_REKEYESTABLISHED: 2347 SM_ENTER(WPA_PTK_GROUP, IDLE); 2348 break; 2349 } 2350} 2351 2352 2353static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 2354 struct wpa_group *group) 2355{ 2356 int ret = 0; 2357 2358 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2359 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2360 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", 2361 wpa_auth->addr, group->GNonce, 2362 group->GTK[group->GN - 1], group->GTK_len) < 0) 2363 ret = -1; 2364 wpa_hexdump_key(MSG_DEBUG, "GTK", 2365 group->GTK[group->GN - 1], group->GTK_len); 2366 2367#ifdef CONFIG_IEEE80211W 2368 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2369 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2370 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2371 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", 2372 wpa_auth->addr, group->GNonce, 2373 group->IGTK[group->GN_igtk - 4], 2374 WPA_IGTK_LEN) < 0) 2375 ret = -1; 2376 wpa_hexdump_key(MSG_DEBUG, "IGTK", 2377 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN); 2378 } 2379#endif /* CONFIG_IEEE80211W */ 2380 2381 return ret; 2382} 2383 2384 2385static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, 2386 struct wpa_group *group) 2387{ 2388 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2389 "GTK_INIT (VLAN-ID %d)", group->vlan_id); 2390 group->changed = FALSE; /* GInit is not cleared here; avoid loop */ 2391 group->wpa_group_state = WPA_GROUP_GTK_INIT; 2392 2393 /* GTK[0..N] = 0 */ 2394 os_memset(group->GTK, 0, sizeof(group->GTK)); 2395 group->GN = 1; 2396 group->GM = 2; 2397#ifdef CONFIG_IEEE80211W 2398 group->GN_igtk = 4; 2399 group->GM_igtk = 5; 2400#endif /* CONFIG_IEEE80211W */ 2401 /* GTK[GN] = CalcGTK() */ 2402 wpa_gtk_update(wpa_auth, group); 2403} 2404 2405 2406static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) 2407{ 2408 if (ctx != NULL && ctx != sm->group) 2409 return 0; 2410 2411 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { 2412 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2413 "Not in PTKINITDONE; skip Group Key update"); 2414 sm->GUpdateStationKeys = FALSE; 2415 return 0; 2416 } 2417 if (sm->GUpdateStationKeys) { 2418 /* 2419 * This should not really happen, so add a debug log entry. 2420 * Since we clear the GKeyDoneStations before the loop, the 2421 * station needs to be counted here anyway. 2422 */ 2423 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2424 "GUpdateStationKeys was already set when " 2425 "marking station for GTK rekeying"); 2426 } 2427 2428 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ 2429 if (sm->is_wnmsleep) 2430 return 0; 2431 2432 sm->group->GKeyDoneStations++; 2433 sm->GUpdateStationKeys = TRUE; 2434 2435 wpa_sm_step(sm); 2436 return 0; 2437} 2438 2439 2440#ifdef CONFIG_WNM 2441/* update GTK when exiting WNM-Sleep Mode */ 2442void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) 2443{ 2444 if (sm->is_wnmsleep) 2445 return; 2446 2447 wpa_group_update_sta(sm, NULL); 2448} 2449 2450 2451void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) 2452{ 2453 sm->is_wnmsleep = !!flag; 2454} 2455 2456 2457int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2458{ 2459 struct wpa_group *gsm = sm->group; 2460 u8 *start = pos; 2461 2462 /* 2463 * GTK subelement: 2464 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 2465 * Key[5..32] 2466 */ 2467 *pos++ = WNM_SLEEP_SUBELEM_GTK; 2468 *pos++ = 11 + gsm->GTK_len; 2469 /* Key ID in B0-B1 of Key Info */ 2470 WPA_PUT_LE16(pos, gsm->GN & 0x03); 2471 pos += 2; 2472 *pos++ = gsm->GTK_len; 2473 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) 2474 return 0; 2475 pos += 8; 2476 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2477 pos += gsm->GTK_len; 2478 2479 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", 2480 gsm->GN); 2481 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", 2482 gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2483 2484 return pos - start; 2485} 2486 2487 2488#ifdef CONFIG_IEEE80211W 2489int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2490{ 2491 struct wpa_group *gsm = sm->group; 2492 u8 *start = pos; 2493 2494 /* 2495 * IGTK subelement: 2496 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] 2497 */ 2498 *pos++ = WNM_SLEEP_SUBELEM_IGTK; 2499 *pos++ = 2 + 6 + WPA_IGTK_LEN; 2500 WPA_PUT_LE16(pos, gsm->GN_igtk); 2501 pos += 2; 2502 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) 2503 return 0; 2504 pos += 6; 2505 2506 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); 2507 pos += WPA_IGTK_LEN; 2508 2509 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", 2510 gsm->GN_igtk); 2511 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", 2512 gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); 2513 2514 return pos - start; 2515} 2516#endif /* CONFIG_IEEE80211W */ 2517#endif /* CONFIG_WNM */ 2518 2519 2520static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, 2521 struct wpa_group *group) 2522{ 2523 int tmp; 2524 2525 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2526 "SETKEYS (VLAN-ID %d)", group->vlan_id); 2527 group->changed = TRUE; 2528 group->wpa_group_state = WPA_GROUP_SETKEYS; 2529 group->GTKReKey = FALSE; 2530 tmp = group->GM; 2531 group->GM = group->GN; 2532 group->GN = tmp; 2533#ifdef CONFIG_IEEE80211W 2534 tmp = group->GM_igtk; 2535 group->GM_igtk = group->GN_igtk; 2536 group->GN_igtk = tmp; 2537#endif /* CONFIG_IEEE80211W */ 2538 /* "GKeyDoneStations = GNoStations" is done in more robust way by 2539 * counting the STAs that are marked with GUpdateStationKeys instead of 2540 * including all STAs that could be in not-yet-completed state. */ 2541 wpa_gtk_update(wpa_auth, group); 2542 2543 if (group->GKeyDoneStations) { 2544 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " 2545 "GKeyDoneStations=%d when starting new GTK rekey", 2546 group->GKeyDoneStations); 2547 group->GKeyDoneStations = 0; 2548 } 2549 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); 2550 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", 2551 group->GKeyDoneStations); 2552} 2553 2554 2555static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 2556 struct wpa_group *group) 2557{ 2558 int ret = 0; 2559 2560 if (wpa_auth_set_key(wpa_auth, group->vlan_id, 2561 wpa_cipher_to_alg(wpa_auth->conf.wpa_group), 2562 broadcast_ether_addr, group->GN, 2563 group->GTK[group->GN - 1], group->GTK_len) < 0) 2564 ret = -1; 2565 2566#ifdef CONFIG_IEEE80211W 2567 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION && 2568 wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK, 2569 broadcast_ether_addr, group->GN_igtk, 2570 group->IGTK[group->GN_igtk - 4], 2571 WPA_IGTK_LEN) < 0) 2572 ret = -1; 2573#endif /* CONFIG_IEEE80211W */ 2574 2575 return ret; 2576} 2577 2578 2579static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, 2580 struct wpa_group *group) 2581{ 2582 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2583 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); 2584 group->changed = TRUE; 2585 group->wpa_group_state = WPA_GROUP_SETKEYSDONE; 2586 2587 if (wpa_group_config_group_keys(wpa_auth, group) < 0) 2588 return -1; 2589 2590 return 0; 2591} 2592 2593 2594static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 2595 struct wpa_group *group) 2596{ 2597 if (group->GInit) { 2598 wpa_group_gtk_init(wpa_auth, group); 2599 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && 2600 group->GTKAuthenticator) { 2601 wpa_group_setkeysdone(wpa_auth, group); 2602 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && 2603 group->GTKReKey) { 2604 wpa_group_setkeys(wpa_auth, group); 2605 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { 2606 if (group->GKeyDoneStations == 0) 2607 wpa_group_setkeysdone(wpa_auth, group); 2608 else if (group->GTKReKey) 2609 wpa_group_setkeys(wpa_auth, group); 2610 } 2611} 2612 2613 2614static int wpa_sm_step(struct wpa_state_machine *sm) 2615{ 2616 if (sm == NULL) 2617 return 0; 2618 2619 if (sm->in_step_loop) { 2620 /* This should not happen, but if it does, make sure we do not 2621 * end up freeing the state machine too early by exiting the 2622 * recursive call. */ 2623 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); 2624 return 0; 2625 } 2626 2627 sm->in_step_loop = 1; 2628 do { 2629 if (sm->pending_deinit) 2630 break; 2631 2632 sm->changed = FALSE; 2633 sm->wpa_auth->group->changed = FALSE; 2634 2635 SM_STEP_RUN(WPA_PTK); 2636 if (sm->pending_deinit) 2637 break; 2638 SM_STEP_RUN(WPA_PTK_GROUP); 2639 if (sm->pending_deinit) 2640 break; 2641 wpa_group_sm_step(sm->wpa_auth, sm->group); 2642 } while (sm->changed || sm->wpa_auth->group->changed); 2643 sm->in_step_loop = 0; 2644 2645 if (sm->pending_deinit) { 2646 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " 2647 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 2648 wpa_free_sta_sm(sm); 2649 return 1; 2650 } 2651 return 0; 2652} 2653 2654 2655static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) 2656{ 2657 struct wpa_state_machine *sm = eloop_ctx; 2658 wpa_sm_step(sm); 2659} 2660 2661 2662void wpa_auth_sm_notify(struct wpa_state_machine *sm) 2663{ 2664 if (sm == NULL) 2665 return; 2666 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); 2667} 2668 2669 2670void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) 2671{ 2672 int tmp, i; 2673 struct wpa_group *group; 2674 2675 if (wpa_auth == NULL) 2676 return; 2677 2678 group = wpa_auth->group; 2679 2680 for (i = 0; i < 2; i++) { 2681 tmp = group->GM; 2682 group->GM = group->GN; 2683 group->GN = tmp; 2684#ifdef CONFIG_IEEE80211W 2685 tmp = group->GM_igtk; 2686 group->GM_igtk = group->GN_igtk; 2687 group->GN_igtk = tmp; 2688#endif /* CONFIG_IEEE80211W */ 2689 wpa_gtk_update(wpa_auth, group); 2690 wpa_group_config_group_keys(wpa_auth, group); 2691 } 2692} 2693 2694 2695static const char * wpa_bool_txt(int bool) 2696{ 2697 return bool ? "TRUE" : "FALSE"; 2698} 2699 2700 2701#define RSN_SUITE "%02x-%02x-%02x-%d" 2702#define RSN_SUITE_ARG(s) \ 2703((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 2704 2705int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) 2706{ 2707 int len = 0, ret; 2708 char pmkid_txt[PMKID_LEN * 2 + 1]; 2709#ifdef CONFIG_RSN_PREAUTH 2710 const int preauth = 1; 2711#else /* CONFIG_RSN_PREAUTH */ 2712 const int preauth = 0; 2713#endif /* CONFIG_RSN_PREAUTH */ 2714 2715 if (wpa_auth == NULL) 2716 return len; 2717 2718 ret = os_snprintf(buf + len, buflen - len, 2719 "dot11RSNAOptionImplemented=TRUE\n" 2720 "dot11RSNAPreauthenticationImplemented=%s\n" 2721 "dot11RSNAEnabled=%s\n" 2722 "dot11RSNAPreauthenticationEnabled=%s\n", 2723 wpa_bool_txt(preauth), 2724 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), 2725 wpa_bool_txt(wpa_auth->conf.rsn_preauth)); 2726 if (ret < 0 || (size_t) ret >= buflen - len) 2727 return len; 2728 len += ret; 2729 2730 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 2731 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); 2732 2733 ret = os_snprintf( 2734 buf + len, buflen - len, 2735 "dot11RSNAConfigVersion=%u\n" 2736 "dot11RSNAConfigPairwiseKeysSupported=9999\n" 2737 /* FIX: dot11RSNAConfigGroupCipher */ 2738 /* FIX: dot11RSNAConfigGroupRekeyMethod */ 2739 /* FIX: dot11RSNAConfigGroupRekeyTime */ 2740 /* FIX: dot11RSNAConfigGroupRekeyPackets */ 2741 "dot11RSNAConfigGroupRekeyStrict=%u\n" 2742 "dot11RSNAConfigGroupUpdateCount=%u\n" 2743 "dot11RSNAConfigPairwiseUpdateCount=%u\n" 2744 "dot11RSNAConfigGroupCipherSize=%u\n" 2745 "dot11RSNAConfigPMKLifetime=%u\n" 2746 "dot11RSNAConfigPMKReauthThreshold=%u\n" 2747 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" 2748 "dot11RSNAConfigSATimeout=%u\n" 2749 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 2750 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 2751 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 2752 "dot11RSNAPMKIDUsed=%s\n" 2753 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 2754 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 2755 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 2756 "dot11RSNATKIPCounterMeasuresInvoked=%u\n" 2757 "dot11RSNA4WayHandshakeFailures=%u\n" 2758 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", 2759 RSN_VERSION, 2760 !!wpa_auth->conf.wpa_strict_rekey, 2761 dot11RSNAConfigGroupUpdateCount, 2762 dot11RSNAConfigPairwiseUpdateCount, 2763 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, 2764 dot11RSNAConfigPMKLifetime, 2765 dot11RSNAConfigPMKReauthThreshold, 2766 dot11RSNAConfigSATimeout, 2767 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), 2768 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), 2769 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), 2770 pmkid_txt, 2771 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), 2772 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), 2773 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), 2774 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, 2775 wpa_auth->dot11RSNA4WayHandshakeFailures); 2776 if (ret < 0 || (size_t) ret >= buflen - len) 2777 return len; 2778 len += ret; 2779 2780 /* TODO: dot11RSNAConfigPairwiseCiphersTable */ 2781 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ 2782 2783 /* Private MIB */ 2784 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", 2785 wpa_auth->group->wpa_group_state); 2786 if (ret < 0 || (size_t) ret >= buflen - len) 2787 return len; 2788 len += ret; 2789 2790 return len; 2791} 2792 2793 2794int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) 2795{ 2796 int len = 0, ret; 2797 u32 pairwise = 0; 2798 2799 if (sm == NULL) 2800 return 0; 2801 2802 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ 2803 2804 /* dot11RSNAStatsEntry */ 2805 2806 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? 2807 WPA_PROTO_RSN : WPA_PROTO_WPA, 2808 sm->pairwise); 2809 if (pairwise == 0) 2810 return 0; 2811 2812 ret = os_snprintf( 2813 buf + len, buflen - len, 2814 /* TODO: dot11RSNAStatsIndex */ 2815 "dot11RSNAStatsSTAAddress=" MACSTR "\n" 2816 "dot11RSNAStatsVersion=1\n" 2817 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" 2818 /* TODO: dot11RSNAStatsTKIPICVErrors */ 2819 "dot11RSNAStatsTKIPLocalMICFailures=%u\n" 2820 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" 2821 /* TODO: dot11RSNAStatsCCMPReplays */ 2822 /* TODO: dot11RSNAStatsCCMPDecryptErrors */ 2823 /* TODO: dot11RSNAStatsTKIPReplays */, 2824 MAC2STR(sm->addr), 2825 RSN_SUITE_ARG(pairwise), 2826 sm->dot11RSNAStatsTKIPLocalMICFailures, 2827 sm->dot11RSNAStatsTKIPRemoteMICFailures); 2828 if (ret < 0 || (size_t) ret >= buflen - len) 2829 return len; 2830 len += ret; 2831 2832 /* Private MIB */ 2833 ret = os_snprintf(buf + len, buflen - len, 2834 "hostapdWPAPTKState=%d\n" 2835 "hostapdWPAPTKGroupState=%d\n", 2836 sm->wpa_ptk_state, 2837 sm->wpa_ptk_group_state); 2838 if (ret < 0 || (size_t) ret >= buflen - len) 2839 return len; 2840 len += ret; 2841 2842 return len; 2843} 2844 2845 2846void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) 2847{ 2848 if (wpa_auth) 2849 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; 2850} 2851 2852 2853int wpa_auth_pairwise_set(struct wpa_state_machine *sm) 2854{ 2855 return sm && sm->pairwise_set; 2856} 2857 2858 2859int wpa_auth_get_pairwise(struct wpa_state_machine *sm) 2860{ 2861 return sm->pairwise; 2862} 2863 2864 2865int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) 2866{ 2867 if (sm == NULL) 2868 return -1; 2869 return sm->wpa_key_mgmt; 2870} 2871 2872 2873int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) 2874{ 2875 if (sm == NULL) 2876 return 0; 2877 return sm->wpa; 2878} 2879 2880 2881int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, 2882 struct rsn_pmksa_cache_entry *entry) 2883{ 2884 if (sm == NULL || sm->pmksa != entry) 2885 return -1; 2886 sm->pmksa = NULL; 2887 return 0; 2888} 2889 2890 2891struct rsn_pmksa_cache_entry * 2892wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) 2893{ 2894 return sm ? sm->pmksa : NULL; 2895} 2896 2897 2898void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) 2899{ 2900 if (sm) 2901 sm->dot11RSNAStatsTKIPLocalMICFailures++; 2902} 2903 2904 2905const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) 2906{ 2907 if (wpa_auth == NULL) 2908 return NULL; 2909 *len = wpa_auth->wpa_ie_len; 2910 return wpa_auth->wpa_ie; 2911} 2912 2913 2914int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, 2915 int session_timeout, struct eapol_state_machine *eapol) 2916{ 2917 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || 2918 sm->wpa_auth->conf.disable_pmksa_caching) 2919 return -1; 2920 2921 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, 2922 sm->wpa_auth->addr, sm->addr, session_timeout, 2923 eapol, sm->wpa_key_mgmt)) 2924 return 0; 2925 2926 return -1; 2927} 2928 2929 2930int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, 2931 const u8 *pmk, size_t len, const u8 *sta_addr, 2932 int session_timeout, 2933 struct eapol_state_machine *eapol) 2934{ 2935 if (wpa_auth == NULL) 2936 return -1; 2937 2938 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr, 2939 sta_addr, session_timeout, eapol, 2940 WPA_KEY_MGMT_IEEE8021X)) 2941 return 0; 2942 2943 return -1; 2944} 2945 2946 2947static struct wpa_group * 2948wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) 2949{ 2950 struct wpa_group *group; 2951 2952 if (wpa_auth == NULL || wpa_auth->group == NULL) 2953 return NULL; 2954 2955 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", 2956 vlan_id); 2957 group = wpa_group_init(wpa_auth, vlan_id, 0); 2958 if (group == NULL) 2959 return NULL; 2960 2961 group->next = wpa_auth->group->next; 2962 wpa_auth->group->next = group; 2963 2964 return group; 2965} 2966 2967 2968int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) 2969{ 2970 struct wpa_group *group; 2971 2972 if (sm == NULL || sm->wpa_auth == NULL) 2973 return 0; 2974 2975 group = sm->wpa_auth->group; 2976 while (group) { 2977 if (group->vlan_id == vlan_id) 2978 break; 2979 group = group->next; 2980 } 2981 2982 if (group == NULL) { 2983 group = wpa_auth_add_group(sm->wpa_auth, vlan_id); 2984 if (group == NULL) 2985 return -1; 2986 } 2987 2988 if (sm->group == group) 2989 return 0; 2990 2991 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " 2992 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); 2993 2994 sm->group = group; 2995 return 0; 2996} 2997 2998 2999void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, 3000 struct wpa_state_machine *sm, int ack) 3001{ 3002 if (wpa_auth == NULL || sm == NULL) 3003 return; 3004 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR 3005 " ack=%d", MAC2STR(sm->addr), ack); 3006 if (sm->pending_1_of_4_timeout && ack) { 3007 /* 3008 * Some deployed supplicant implementations update their SNonce 3009 * for each EAPOL-Key 2/4 message even within the same 4-way 3010 * handshake and then fail to use the first SNonce when 3011 * deriving the PTK. This results in unsuccessful 4-way 3012 * handshake whenever the relatively short initial timeout is 3013 * reached and EAPOL-Key 1/4 is retransmitted. Try to work 3014 * around this by increasing the timeout now that we know that 3015 * the station has received the frame. 3016 */ 3017 int timeout_ms = eapol_key_timeout_subseq; 3018 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " 3019 "timeout by %u ms because of acknowledged frame", 3020 timeout_ms); 3021 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 3022 eloop_register_timeout(timeout_ms / 1000, 3023 (timeout_ms % 1000) * 1000, 3024 wpa_send_eapol_timeout, wpa_auth, sm); 3025 } 3026} 3027 3028 3029int wpa_auth_uses_sae(struct wpa_state_machine *sm) 3030{ 3031 if (sm == NULL) 3032 return 0; 3033 return wpa_key_mgmt_sae(sm->wpa_key_mgmt); 3034} 3035