wpa_auth.c revision 9866086a955d00e237cc8df3722e7dff75c02532
1/* 2 * IEEE 802.11 RSN / WPA Authenticator 3 * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#include "utils/includes.h" 10 11#include "utils/common.h" 12#include "utils/eloop.h" 13#include "utils/state_machine.h" 14#include "utils/bitfield.h" 15#include "common/ieee802_11_defs.h" 16#include "crypto/aes_wrap.h" 17#include "crypto/crypto.h" 18#include "crypto/sha1.h" 19#include "crypto/sha256.h" 20#include "crypto/random.h" 21#include "eapol_auth/eapol_auth_sm.h" 22#include "ap_config.h" 23#include "ieee802_11.h" 24#include "wpa_auth.h" 25#include "pmksa_cache_auth.h" 26#include "wpa_auth_i.h" 27#include "wpa_auth_ie.h" 28 29#define STATE_MACHINE_DATA struct wpa_state_machine 30#define STATE_MACHINE_DEBUG_PREFIX "WPA" 31#define STATE_MACHINE_ADDR sm->addr 32 33 34static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx); 35static int wpa_sm_step(struct wpa_state_machine *sm); 36static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len); 37static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx); 38static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 39 struct wpa_group *group); 40static void wpa_request_new_ptk(struct wpa_state_machine *sm); 41static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 42 struct wpa_group *group); 43static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 44 struct wpa_group *group); 45 46static const u32 dot11RSNAConfigGroupUpdateCount = 4; 47static const u32 dot11RSNAConfigPairwiseUpdateCount = 4; 48static const u32 eapol_key_timeout_first = 100; /* ms */ 49static const u32 eapol_key_timeout_subseq = 1000; /* ms */ 50static const u32 eapol_key_timeout_first_group = 500; /* ms */ 51 52/* TODO: make these configurable */ 53static const int dot11RSNAConfigPMKLifetime = 43200; 54static const int dot11RSNAConfigPMKReauthThreshold = 70; 55static const int dot11RSNAConfigSATimeout = 60; 56 57 58static inline int wpa_auth_mic_failure_report( 59 struct wpa_authenticator *wpa_auth, const u8 *addr) 60{ 61 if (wpa_auth->cb.mic_failure_report) 62 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr); 63 return 0; 64} 65 66 67static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth, 68 const u8 *addr, wpa_eapol_variable var, 69 int value) 70{ 71 if (wpa_auth->cb.set_eapol) 72 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value); 73} 74 75 76static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth, 77 const u8 *addr, wpa_eapol_variable var) 78{ 79 if (wpa_auth->cb.get_eapol == NULL) 80 return -1; 81 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var); 82} 83 84 85static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth, 86 const u8 *addr, 87 const u8 *p2p_dev_addr, 88 const u8 *prev_psk) 89{ 90 if (wpa_auth->cb.get_psk == NULL) 91 return NULL; 92 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr, 93 prev_psk); 94} 95 96 97static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth, 98 const u8 *addr, u8 *msk, size_t *len) 99{ 100 if (wpa_auth->cb.get_msk == NULL) 101 return -1; 102 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len); 103} 104 105 106static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 107 int vlan_id, 108 enum wpa_alg alg, const u8 *addr, int idx, 109 u8 *key, size_t key_len) 110{ 111 if (wpa_auth->cb.set_key == NULL) 112 return -1; 113 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 114 key, key_len); 115} 116 117 118static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 119 const u8 *addr, int idx, u8 *seq) 120{ 121 if (wpa_auth->cb.get_seqnum == NULL) 122 return -1; 123 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 124} 125 126 127static inline int 128wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr, 129 const u8 *data, size_t data_len, int encrypt) 130{ 131 if (wpa_auth->cb.send_eapol == NULL) 132 return -1; 133 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len, 134 encrypt); 135} 136 137 138int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth, 139 int (*cb)(struct wpa_state_machine *sm, void *ctx), 140 void *cb_ctx) 141{ 142 if (wpa_auth->cb.for_each_sta == NULL) 143 return 0; 144 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx); 145} 146 147 148int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth, 149 int (*cb)(struct wpa_authenticator *a, void *ctx), 150 void *cb_ctx) 151{ 152 if (wpa_auth->cb.for_each_auth == NULL) 153 return 0; 154 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx); 155} 156 157 158void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr, 159 logger_level level, const char *txt) 160{ 161 if (wpa_auth->cb.logger == NULL) 162 return; 163 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt); 164} 165 166 167void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr, 168 logger_level level, const char *fmt, ...) 169{ 170 char *format; 171 int maxlen; 172 va_list ap; 173 174 if (wpa_auth->cb.logger == NULL) 175 return; 176 177 maxlen = os_strlen(fmt) + 100; 178 format = os_malloc(maxlen); 179 if (!format) 180 return; 181 182 va_start(ap, fmt); 183 vsnprintf(format, maxlen, fmt, ap); 184 va_end(ap); 185 186 wpa_auth_logger(wpa_auth, addr, level, format); 187 188 os_free(format); 189} 190 191 192static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth, 193 const u8 *addr) 194{ 195 if (wpa_auth->cb.disconnect == NULL) 196 return; 197 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr)); 198 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr, 199 WLAN_REASON_PREV_AUTH_NOT_VALID); 200} 201 202 203static int wpa_use_aes_cmac(struct wpa_state_machine *sm) 204{ 205 int ret = 0; 206#ifdef CONFIG_IEEE80211R 207 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 208 ret = 1; 209#endif /* CONFIG_IEEE80211R */ 210#ifdef CONFIG_IEEE80211W 211 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt)) 212 ret = 1; 213#endif /* CONFIG_IEEE80211W */ 214 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) 215 ret = 1; 216 return ret; 217} 218 219 220static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx) 221{ 222 struct wpa_authenticator *wpa_auth = eloop_ctx; 223 224 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) { 225 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 226 "initialization."); 227 } else { 228 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd"); 229 wpa_hexdump_key(MSG_DEBUG, "GMK", 230 wpa_auth->group->GMK, WPA_GMK_LEN); 231 } 232 233 if (wpa_auth->conf.wpa_gmk_rekey) { 234 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 235 wpa_rekey_gmk, wpa_auth, NULL); 236 } 237} 238 239 240static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx) 241{ 242 struct wpa_authenticator *wpa_auth = eloop_ctx; 243 struct wpa_group *group; 244 245 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK"); 246 for (group = wpa_auth->group; group; group = group->next) { 247 group->GTKReKey = TRUE; 248 do { 249 group->changed = FALSE; 250 wpa_group_sm_step(wpa_auth, group); 251 } while (group->changed); 252 } 253 254 if (wpa_auth->conf.wpa_group_rekey) { 255 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 256 0, wpa_rekey_gtk, wpa_auth, NULL); 257 } 258} 259 260 261static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 262{ 263 struct wpa_authenticator *wpa_auth = eloop_ctx; 264 struct wpa_state_machine *sm = timeout_ctx; 265 266 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK"); 267 wpa_request_new_ptk(sm); 268 wpa_sm_step(sm); 269} 270 271 272static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx) 273{ 274 if (sm->pmksa == ctx) 275 sm->pmksa = NULL; 276 return 0; 277} 278 279 280static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 281 void *ctx) 282{ 283 struct wpa_authenticator *wpa_auth = ctx; 284 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry); 285} 286 287 288static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth, 289 struct wpa_group *group) 290{ 291 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)]; 292 u8 rkey[32]; 293 unsigned long ptr; 294 295 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0) 296 return -1; 297 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN); 298 299 /* 300 * Counter = PRF-256(Random number, "Init Counter", 301 * Local MAC Address || Time) 302 */ 303 os_memcpy(buf, wpa_auth->addr, ETH_ALEN); 304 wpa_get_ntp_timestamp(buf + ETH_ALEN); 305 ptr = (unsigned long) group; 306 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr)); 307 if (random_get_bytes(rkey, sizeof(rkey)) < 0) 308 return -1; 309 310 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf), 311 group->Counter, WPA_NONCE_LEN) < 0) 312 return -1; 313 wpa_hexdump_key(MSG_DEBUG, "Key Counter", 314 group->Counter, WPA_NONCE_LEN); 315 316 return 0; 317} 318 319 320static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth, 321 int vlan_id, int delay_init) 322{ 323 struct wpa_group *group; 324 325 group = os_zalloc(sizeof(struct wpa_group)); 326 if (group == NULL) 327 return NULL; 328 329 group->GTKAuthenticator = TRUE; 330 group->vlan_id = vlan_id; 331 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 332 333 if (random_pool_ready() != 1) { 334 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 335 "for secure operations - update keys later when " 336 "the first station connects"); 337 } 338 339 /* 340 * Set initial GMK/Counter value here. The actual values that will be 341 * used in negotiations will be set once the first station tries to 342 * connect. This allows more time for collecting additional randomness 343 * on embedded devices. 344 */ 345 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) { 346 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 347 "initialization."); 348 os_free(group); 349 return NULL; 350 } 351 352 group->GInit = TRUE; 353 if (delay_init) { 354 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start " 355 "until Beacon frames have been configured"); 356 /* Initialization is completed in wpa_init_keys(). */ 357 } else { 358 wpa_group_sm_step(wpa_auth, group); 359 group->GInit = FALSE; 360 wpa_group_sm_step(wpa_auth, group); 361 } 362 363 return group; 364} 365 366 367/** 368 * wpa_init - Initialize WPA authenticator 369 * @addr: Authenticator address 370 * @conf: Configuration for WPA authenticator 371 * @cb: Callback functions for WPA authenticator 372 * Returns: Pointer to WPA authenticator data or %NULL on failure 373 */ 374struct wpa_authenticator * wpa_init(const u8 *addr, 375 struct wpa_auth_config *conf, 376 struct wpa_auth_callbacks *cb) 377{ 378 struct wpa_authenticator *wpa_auth; 379 380 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator)); 381 if (wpa_auth == NULL) 382 return NULL; 383 os_memcpy(wpa_auth->addr, addr, ETH_ALEN); 384 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 385 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb)); 386 387 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 388 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 389 os_free(wpa_auth); 390 return NULL; 391 } 392 393 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1); 394 if (wpa_auth->group == NULL) { 395 os_free(wpa_auth->wpa_ie); 396 os_free(wpa_auth); 397 return NULL; 398 } 399 400 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb, 401 wpa_auth); 402 if (wpa_auth->pmksa == NULL) { 403 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed."); 404 os_free(wpa_auth->wpa_ie); 405 os_free(wpa_auth); 406 return NULL; 407 } 408 409#ifdef CONFIG_IEEE80211R 410 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init(); 411 if (wpa_auth->ft_pmk_cache == NULL) { 412 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed."); 413 os_free(wpa_auth->wpa_ie); 414 pmksa_cache_auth_deinit(wpa_auth->pmksa); 415 os_free(wpa_auth); 416 return NULL; 417 } 418#endif /* CONFIG_IEEE80211R */ 419 420 if (wpa_auth->conf.wpa_gmk_rekey) { 421 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 422 wpa_rekey_gmk, wpa_auth, NULL); 423 } 424 425 if (wpa_auth->conf.wpa_group_rekey) { 426 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0, 427 wpa_rekey_gtk, wpa_auth, NULL); 428 } 429 430#ifdef CONFIG_P2P 431 if (WPA_GET_BE32(conf->ip_addr_start)) { 432 int count = WPA_GET_BE32(conf->ip_addr_end) - 433 WPA_GET_BE32(conf->ip_addr_start) + 1; 434 if (count > 1000) 435 count = 1000; 436 if (count > 0) 437 wpa_auth->ip_pool = bitfield_alloc(count); 438 } 439#endif /* CONFIG_P2P */ 440 441 return wpa_auth; 442} 443 444 445int wpa_init_keys(struct wpa_authenticator *wpa_auth) 446{ 447 struct wpa_group *group = wpa_auth->group; 448 449 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial " 450 "keys"); 451 wpa_group_sm_step(wpa_auth, group); 452 group->GInit = FALSE; 453 wpa_group_sm_step(wpa_auth, group); 454 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 455 return -1; 456 return 0; 457} 458 459 460/** 461 * wpa_deinit - Deinitialize WPA authenticator 462 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 463 */ 464void wpa_deinit(struct wpa_authenticator *wpa_auth) 465{ 466 struct wpa_group *group, *prev; 467 468 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL); 469 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 470 471#ifdef CONFIG_PEERKEY 472 while (wpa_auth->stsl_negotiations) 473 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations); 474#endif /* CONFIG_PEERKEY */ 475 476 pmksa_cache_auth_deinit(wpa_auth->pmksa); 477 478#ifdef CONFIG_IEEE80211R 479 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache); 480 wpa_auth->ft_pmk_cache = NULL; 481#endif /* CONFIG_IEEE80211R */ 482 483#ifdef CONFIG_P2P 484 bitfield_free(wpa_auth->ip_pool); 485#endif /* CONFIG_P2P */ 486 487 488 os_free(wpa_auth->wpa_ie); 489 490 group = wpa_auth->group; 491 while (group) { 492 prev = group; 493 group = group->next; 494 os_free(prev); 495 } 496 497 os_free(wpa_auth); 498} 499 500 501/** 502 * wpa_reconfig - Update WPA authenticator configuration 503 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 504 * @conf: Configuration for WPA authenticator 505 */ 506int wpa_reconfig(struct wpa_authenticator *wpa_auth, 507 struct wpa_auth_config *conf) 508{ 509 struct wpa_group *group; 510 if (wpa_auth == NULL) 511 return 0; 512 513 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 514 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 515 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 516 return -1; 517 } 518 519 /* 520 * Reinitialize GTK to make sure it is suitable for the new 521 * configuration. 522 */ 523 group = wpa_auth->group; 524 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 525 group->GInit = TRUE; 526 wpa_group_sm_step(wpa_auth, group); 527 group->GInit = FALSE; 528 wpa_group_sm_step(wpa_auth, group); 529 530 return 0; 531} 532 533 534struct wpa_state_machine * 535wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr, 536 const u8 *p2p_dev_addr) 537{ 538 struct wpa_state_machine *sm; 539 540 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 541 return NULL; 542 543 sm = os_zalloc(sizeof(struct wpa_state_machine)); 544 if (sm == NULL) 545 return NULL; 546 os_memcpy(sm->addr, addr, ETH_ALEN); 547 if (p2p_dev_addr) 548 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN); 549 550 sm->wpa_auth = wpa_auth; 551 sm->group = wpa_auth->group; 552 553 return sm; 554} 555 556 557int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth, 558 struct wpa_state_machine *sm) 559{ 560 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 561 return -1; 562 563#ifdef CONFIG_IEEE80211R 564 if (sm->ft_completed) { 565 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 566 "FT authentication already completed - do not " 567 "start 4-way handshake"); 568 return 0; 569 } 570#endif /* CONFIG_IEEE80211R */ 571 572 if (sm->started) { 573 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); 574 sm->ReAuthenticationRequest = TRUE; 575 return wpa_sm_step(sm); 576 } 577 578 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 579 "start authentication"); 580 sm->started = 1; 581 582 sm->Init = TRUE; 583 if (wpa_sm_step(sm) == 1) 584 return 1; /* should not really happen */ 585 sm->Init = FALSE; 586 sm->AuthenticationRequest = TRUE; 587 return wpa_sm_step(sm); 588} 589 590 591void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) 592{ 593 /* WPA/RSN was not used - clear WPA state. This is needed if the STA 594 * reassociates back to the same AP while the previous entry for the 595 * STA has not yet been removed. */ 596 if (sm == NULL) 597 return; 598 599 sm->wpa_key_mgmt = 0; 600} 601 602 603static void wpa_free_sta_sm(struct wpa_state_machine *sm) 604{ 605#ifdef CONFIG_P2P 606 if (WPA_GET_BE32(sm->ip_addr)) { 607 u32 start; 608 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP " 609 "address %u.%u.%u.%u from " MACSTR, 610 sm->ip_addr[0], sm->ip_addr[1], 611 sm->ip_addr[2], sm->ip_addr[3], 612 MAC2STR(sm->addr)); 613 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start); 614 bitfield_clear(sm->wpa_auth->ip_pool, 615 WPA_GET_BE32(sm->ip_addr) - start); 616 } 617#endif /* CONFIG_P2P */ 618 if (sm->GUpdateStationKeys) { 619 sm->group->GKeyDoneStations--; 620 sm->GUpdateStationKeys = FALSE; 621 } 622#ifdef CONFIG_IEEE80211R 623 os_free(sm->assoc_resp_ftie); 624#endif /* CONFIG_IEEE80211R */ 625 os_free(sm->last_rx_eapol_key); 626 os_free(sm->wpa_ie); 627 os_free(sm); 628} 629 630 631void wpa_auth_sta_deinit(struct wpa_state_machine *sm) 632{ 633 if (sm == NULL) 634 return; 635 636 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { 637 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 638 "strict rekeying - force GTK rekey since STA " 639 "is leaving"); 640 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); 641 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, 642 NULL); 643 } 644 645 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 646 sm->pending_1_of_4_timeout = 0; 647 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); 648 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 649 if (sm->in_step_loop) { 650 /* Must not free state machine while wpa_sm_step() is running. 651 * Freeing will be completed in the end of wpa_sm_step(). */ 652 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " 653 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 654 sm->pending_deinit = 1; 655 } else 656 wpa_free_sta_sm(sm); 657} 658 659 660static void wpa_request_new_ptk(struct wpa_state_machine *sm) 661{ 662 if (sm == NULL) 663 return; 664 665 sm->PTKRequest = TRUE; 666 sm->PTK_valid = 0; 667} 668 669 670static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, 671 const u8 *replay_counter) 672{ 673 int i; 674 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 675 if (!ctr[i].valid) 676 break; 677 if (os_memcmp(replay_counter, ctr[i].counter, 678 WPA_REPLAY_COUNTER_LEN) == 0) 679 return 1; 680 } 681 return 0; 682} 683 684 685static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, 686 const u8 *replay_counter) 687{ 688 int i; 689 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 690 if (ctr[i].valid && 691 (replay_counter == NULL || 692 os_memcmp(replay_counter, ctr[i].counter, 693 WPA_REPLAY_COUNTER_LEN) == 0)) 694 ctr[i].valid = FALSE; 695 } 696} 697 698 699#ifdef CONFIG_IEEE80211R 700static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, 701 struct wpa_state_machine *sm, 702 struct wpa_eapol_ie_parse *kde) 703{ 704 struct wpa_ie_data ie; 705 struct rsn_mdie *mdie; 706 707 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || 708 ie.num_pmkid != 1 || ie.pmkid == NULL) { 709 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " 710 "FT 4-way handshake message 2/4"); 711 return -1; 712 } 713 714 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); 715 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", 716 sm->sup_pmk_r1_name, PMKID_LEN); 717 718 if (!kde->mdie || !kde->ftie) { 719 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " 720 "message 2/4", kde->mdie ? "FTIE" : "MDIE"); 721 return -1; 722 } 723 724 mdie = (struct rsn_mdie *) (kde->mdie + 2); 725 if (kde->mdie[1] < sizeof(struct rsn_mdie) || 726 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, 727 MOBILITY_DOMAIN_ID_LEN) != 0) { 728 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); 729 return -1; 730 } 731 732 if (sm->assoc_resp_ftie && 733 (kde->ftie[1] != sm->assoc_resp_ftie[1] || 734 os_memcmp(kde->ftie, sm->assoc_resp_ftie, 735 2 + sm->assoc_resp_ftie[1]) != 0)) { 736 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); 737 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", 738 kde->ftie, kde->ftie_len); 739 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", 740 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); 741 return -1; 742 } 743 744 return 0; 745} 746#endif /* CONFIG_IEEE80211R */ 747 748 749static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth, 750 struct wpa_state_machine *sm, int group) 751{ 752 /* Supplicant reported a Michael MIC error */ 753 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 754 "received EAPOL-Key Error Request " 755 "(STA detected Michael MIC failure (group=%d))", 756 group); 757 758 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { 759 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 760 "ignore Michael MIC failure report since " 761 "group cipher is not TKIP"); 762 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { 763 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 764 "ignore Michael MIC failure report since " 765 "pairwise cipher is not TKIP"); 766 } else { 767 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0) 768 return 1; /* STA entry was removed */ 769 sm->dot11RSNAStatsTKIPRemoteMICFailures++; 770 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; 771 } 772 773 /* 774 * Error report is not a request for a new key handshake, but since 775 * Authenticator may do it, let's change the keys now anyway. 776 */ 777 wpa_request_new_ptk(sm); 778 return 0; 779} 780 781 782void wpa_receive(struct wpa_authenticator *wpa_auth, 783 struct wpa_state_machine *sm, 784 u8 *data, size_t data_len) 785{ 786 struct ieee802_1x_hdr *hdr; 787 struct wpa_eapol_key *key; 788 u16 key_info, key_data_length; 789 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, 790 SMK_M1, SMK_M3, SMK_ERROR } msg; 791 char *msgtxt; 792 struct wpa_eapol_ie_parse kde; 793 int ft; 794 const u8 *eapol_key_ie; 795 size_t eapol_key_ie_len; 796 797 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 798 return; 799 800 if (data_len < sizeof(*hdr) + sizeof(*key)) 801 return; 802 803 hdr = (struct ieee802_1x_hdr *) data; 804 key = (struct wpa_eapol_key *) (hdr + 1); 805 key_info = WPA_GET_BE16(key->key_info); 806 key_data_length = WPA_GET_BE16(key->key_data_length); 807 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR 808 " key_info=0x%x type=%u key_data_length=%u", 809 MAC2STR(sm->addr), key_info, key->type, key_data_length); 810 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) { 811 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " 812 "key_data overflow (%d > %lu)", 813 key_data_length, 814 (unsigned long) (data_len - sizeof(*hdr) - 815 sizeof(*key))); 816 return; 817 } 818 819 if (sm->wpa == WPA_VERSION_WPA2) { 820 if (key->type == EAPOL_KEY_TYPE_WPA) { 821 /* 822 * Some deployed station implementations seem to send 823 * msg 4/4 with incorrect type value in WPA2 mode. 824 */ 825 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " 826 "with unexpected WPA type in RSN mode"); 827 } else if (key->type != EAPOL_KEY_TYPE_RSN) { 828 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 829 "unexpected type %d in RSN mode", 830 key->type); 831 return; 832 } 833 } else { 834 if (key->type != EAPOL_KEY_TYPE_WPA) { 835 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 836 "unexpected type %d in WPA mode", 837 key->type); 838 return; 839 } 840 } 841 842 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, 843 WPA_NONCE_LEN); 844 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", 845 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 846 847 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys 848 * are set */ 849 850 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == 851 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { 852 if (key_info & WPA_KEY_INFO_ERROR) { 853 msg = SMK_ERROR; 854 msgtxt = "SMK Error"; 855 } else { 856 msg = SMK_M1; 857 msgtxt = "SMK M1"; 858 } 859 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 860 msg = SMK_M3; 861 msgtxt = "SMK M3"; 862 } else if (key_info & WPA_KEY_INFO_REQUEST) { 863 msg = REQUEST; 864 msgtxt = "Request"; 865 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { 866 msg = GROUP_2; 867 msgtxt = "2/2 Group"; 868 } else if (key_data_length == 0) { 869 msg = PAIRWISE_4; 870 msgtxt = "4/4 Pairwise"; 871 } else { 872 msg = PAIRWISE_2; 873 msgtxt = "2/4 Pairwise"; 874 } 875 876 /* TODO: key_info type validation for PeerKey */ 877 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || 878 msg == GROUP_2) { 879 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 880 if (sm->pairwise == WPA_CIPHER_CCMP || 881 sm->pairwise == WPA_CIPHER_GCMP) { 882 if (wpa_use_aes_cmac(sm) && 883 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN && 884 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 885 wpa_auth_logger(wpa_auth, sm->addr, 886 LOGGER_WARNING, 887 "advertised support for " 888 "AES-128-CMAC, but did not " 889 "use it"); 890 return; 891 } 892 893 if (!wpa_use_aes_cmac(sm) && 894 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 895 wpa_auth_logger(wpa_auth, sm->addr, 896 LOGGER_WARNING, 897 "did not use HMAC-SHA1-AES " 898 "with CCMP/GCMP"); 899 return; 900 } 901 } 902 } 903 904 if (key_info & WPA_KEY_INFO_REQUEST) { 905 if (sm->req_replay_counter_used && 906 os_memcmp(key->replay_counter, sm->req_replay_counter, 907 WPA_REPLAY_COUNTER_LEN) <= 0) { 908 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 909 "received EAPOL-Key request with " 910 "replayed counter"); 911 return; 912 } 913 } 914 915 if (!(key_info & WPA_KEY_INFO_REQUEST) && 916 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { 917 int i; 918 919 if (msg == PAIRWISE_2 && 920 wpa_replay_counter_valid(sm->prev_key_replay, 921 key->replay_counter) && 922 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 923 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) 924 { 925 /* 926 * Some supplicant implementations (e.g., Windows XP 927 * WZC) update SNonce for each EAPOL-Key 2/4. This 928 * breaks the workaround on accepting any of the 929 * pending requests, so allow the SNonce to be updated 930 * even if we have already sent out EAPOL-Key 3/4. 931 */ 932 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 933 "Process SNonce update from STA " 934 "based on retransmitted EAPOL-Key " 935 "1/4"); 936 sm->update_snonce = 1; 937 wpa_replay_counter_mark_invalid(sm->prev_key_replay, 938 key->replay_counter); 939 goto continue_processing; 940 } 941 942 if (msg == PAIRWISE_2 && 943 wpa_replay_counter_valid(sm->prev_key_replay, 944 key->replay_counter) && 945 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { 946 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 947 "ignore retransmitted EAPOL-Key %s - " 948 "SNonce did not change", msgtxt); 949 } else { 950 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 951 "received EAPOL-Key %s with " 952 "unexpected replay counter", msgtxt); 953 } 954 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 955 if (!sm->key_replay[i].valid) 956 break; 957 wpa_hexdump(MSG_DEBUG, "pending replay counter", 958 sm->key_replay[i].counter, 959 WPA_REPLAY_COUNTER_LEN); 960 } 961 wpa_hexdump(MSG_DEBUG, "received replay counter", 962 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 963 return; 964 } 965 966continue_processing: 967 switch (msg) { 968 case PAIRWISE_2: 969 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && 970 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && 971 (!sm->update_snonce || 972 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { 973 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 974 "received EAPOL-Key msg 2/4 in " 975 "invalid state (%d) - dropped", 976 sm->wpa_ptk_state); 977 return; 978 } 979 random_add_randomness(key->key_nonce, WPA_NONCE_LEN); 980 if (sm->group->reject_4way_hs_for_entropy) { 981 /* 982 * The system did not have enough entropy to generate 983 * strong random numbers. Reject the first 4-way 984 * handshake(s) and collect some entropy based on the 985 * information from it. Once enough entropy is 986 * available, the next atempt will trigger GMK/Key 987 * Counter update and the station will be allowed to 988 * continue. 989 */ 990 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " 991 "collect more entropy for random number " 992 "generation"); 993 random_mark_pool_ready(); 994 wpa_sta_disconnect(wpa_auth, sm->addr); 995 return; 996 } 997 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length, 998 &kde) < 0) { 999 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1000 "received EAPOL-Key msg 2/4 with " 1001 "invalid Key Data contents"); 1002 return; 1003 } 1004 if (kde.rsn_ie) { 1005 eapol_key_ie = kde.rsn_ie; 1006 eapol_key_ie_len = kde.rsn_ie_len; 1007 } else if (kde.osen) { 1008 eapol_key_ie = kde.osen; 1009 eapol_key_ie_len = kde.osen_len; 1010 } else { 1011 eapol_key_ie = kde.wpa_ie; 1012 eapol_key_ie_len = kde.wpa_ie_len; 1013 } 1014 ft = sm->wpa == WPA_VERSION_WPA2 && 1015 wpa_key_mgmt_ft(sm->wpa_key_mgmt); 1016 if (sm->wpa_ie == NULL || 1017 wpa_compare_rsn_ie(ft, 1018 sm->wpa_ie, sm->wpa_ie_len, 1019 eapol_key_ie, eapol_key_ie_len)) { 1020 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1021 "WPA IE from (Re)AssocReq did not " 1022 "match with msg 2/4"); 1023 if (sm->wpa_ie) { 1024 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", 1025 sm->wpa_ie, sm->wpa_ie_len); 1026 } 1027 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", 1028 eapol_key_ie, eapol_key_ie_len); 1029 /* MLME-DEAUTHENTICATE.request */ 1030 wpa_sta_disconnect(wpa_auth, sm->addr); 1031 return; 1032 } 1033#ifdef CONFIG_IEEE80211R 1034 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { 1035 wpa_sta_disconnect(wpa_auth, sm->addr); 1036 return; 1037 } 1038#endif /* CONFIG_IEEE80211R */ 1039#ifdef CONFIG_P2P 1040 if (kde.ip_addr_req && kde.ip_addr_req[0] && 1041 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) { 1042 int idx; 1043 wpa_printf(MSG_DEBUG, "P2P: IP address requested in " 1044 "EAPOL-Key exchange"); 1045 idx = bitfield_get_first_zero(wpa_auth->ip_pool); 1046 if (idx >= 0) { 1047 u32 start = WPA_GET_BE32(wpa_auth->conf. 1048 ip_addr_start); 1049 bitfield_set(wpa_auth->ip_pool, idx); 1050 WPA_PUT_BE32(sm->ip_addr, start + idx); 1051 wpa_printf(MSG_DEBUG, "P2P: Assigned IP " 1052 "address %u.%u.%u.%u to " MACSTR, 1053 sm->ip_addr[0], sm->ip_addr[1], 1054 sm->ip_addr[2], sm->ip_addr[3], 1055 MAC2STR(sm->addr)); 1056 } 1057 } 1058#endif /* CONFIG_P2P */ 1059 break; 1060 case PAIRWISE_4: 1061 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || 1062 !sm->PTK_valid) { 1063 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1064 "received EAPOL-Key msg 4/4 in " 1065 "invalid state (%d) - dropped", 1066 sm->wpa_ptk_state); 1067 return; 1068 } 1069 break; 1070 case GROUP_2: 1071 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING 1072 || !sm->PTK_valid) { 1073 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1074 "received EAPOL-Key msg 2/2 in " 1075 "invalid state (%d) - dropped", 1076 sm->wpa_ptk_group_state); 1077 return; 1078 } 1079 break; 1080#ifdef CONFIG_PEERKEY 1081 case SMK_M1: 1082 case SMK_M3: 1083 case SMK_ERROR: 1084 if (!wpa_auth->conf.peerkey) { 1085 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " 1086 "PeerKey use disabled - ignoring message"); 1087 return; 1088 } 1089 if (!sm->PTK_valid) { 1090 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1091 "received EAPOL-Key msg SMK in " 1092 "invalid state - dropped"); 1093 return; 1094 } 1095 break; 1096#else /* CONFIG_PEERKEY */ 1097 case SMK_M1: 1098 case SMK_M3: 1099 case SMK_ERROR: 1100 return; /* STSL disabled - ignore SMK messages */ 1101#endif /* CONFIG_PEERKEY */ 1102 case REQUEST: 1103 break; 1104 } 1105 1106 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1107 "received EAPOL-Key frame (%s)", msgtxt); 1108 1109 if (key_info & WPA_KEY_INFO_ACK) { 1110 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1111 "received invalid EAPOL-Key: Key Ack set"); 1112 return; 1113 } 1114 1115 if (!(key_info & WPA_KEY_INFO_MIC)) { 1116 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1117 "received invalid EAPOL-Key: Key MIC not set"); 1118 return; 1119 } 1120 1121 sm->MICVerified = FALSE; 1122 if (sm->PTK_valid && !sm->update_snonce) { 1123 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) { 1124 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1125 "received EAPOL-Key with invalid MIC"); 1126 return; 1127 } 1128 sm->MICVerified = TRUE; 1129 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 1130 sm->pending_1_of_4_timeout = 0; 1131 } 1132 1133 if (key_info & WPA_KEY_INFO_REQUEST) { 1134 if (sm->MICVerified) { 1135 sm->req_replay_counter_used = 1; 1136 os_memcpy(sm->req_replay_counter, key->replay_counter, 1137 WPA_REPLAY_COUNTER_LEN); 1138 } else { 1139 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1140 "received EAPOL-Key request with " 1141 "invalid MIC"); 1142 return; 1143 } 1144 1145 /* 1146 * TODO: should decrypt key data field if encryption was used; 1147 * even though MAC address KDE is not normally encrypted, 1148 * supplicant is allowed to encrypt it. 1149 */ 1150 if (msg == SMK_ERROR) { 1151#ifdef CONFIG_PEERKEY 1152 wpa_smk_error(wpa_auth, sm, key); 1153#endif /* CONFIG_PEERKEY */ 1154 return; 1155 } else if (key_info & WPA_KEY_INFO_ERROR) { 1156 if (wpa_receive_error_report( 1157 wpa_auth, sm, 1158 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0) 1159 return; /* STA entry was removed */ 1160 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1161 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1162 "received EAPOL-Key Request for new " 1163 "4-Way Handshake"); 1164 wpa_request_new_ptk(sm); 1165#ifdef CONFIG_PEERKEY 1166 } else if (msg == SMK_M1) { 1167 wpa_smk_m1(wpa_auth, sm, key); 1168#endif /* CONFIG_PEERKEY */ 1169 } else if (key_data_length > 0 && 1170 wpa_parse_kde_ies((const u8 *) (key + 1), 1171 key_data_length, &kde) == 0 && 1172 kde.mac_addr) { 1173 } else { 1174 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1175 "received EAPOL-Key Request for GTK " 1176 "rekeying"); 1177 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 1178 wpa_rekey_gtk(wpa_auth, NULL); 1179 } 1180 } else { 1181 /* Do not allow the same key replay counter to be reused. */ 1182 wpa_replay_counter_mark_invalid(sm->key_replay, 1183 key->replay_counter); 1184 1185 if (msg == PAIRWISE_2) { 1186 /* 1187 * Maintain a copy of the pending EAPOL-Key frames in 1188 * case the EAPOL-Key frame was retransmitted. This is 1189 * needed to allow EAPOL-Key msg 2/4 reply to another 1190 * pending msg 1/4 to update the SNonce to work around 1191 * unexpected supplicant behavior. 1192 */ 1193 os_memcpy(sm->prev_key_replay, sm->key_replay, 1194 sizeof(sm->key_replay)); 1195 } else { 1196 os_memset(sm->prev_key_replay, 0, 1197 sizeof(sm->prev_key_replay)); 1198 } 1199 1200 /* 1201 * Make sure old valid counters are not accepted anymore and 1202 * do not get copied again. 1203 */ 1204 wpa_replay_counter_mark_invalid(sm->key_replay, NULL); 1205 } 1206 1207#ifdef CONFIG_PEERKEY 1208 if (msg == SMK_M3) { 1209 wpa_smk_m3(wpa_auth, sm, key); 1210 return; 1211 } 1212#endif /* CONFIG_PEERKEY */ 1213 1214 os_free(sm->last_rx_eapol_key); 1215 sm->last_rx_eapol_key = os_malloc(data_len); 1216 if (sm->last_rx_eapol_key == NULL) 1217 return; 1218 os_memcpy(sm->last_rx_eapol_key, data, data_len); 1219 sm->last_rx_eapol_key_len = data_len; 1220 1221 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); 1222 sm->EAPOLKeyReceived = TRUE; 1223 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1224 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); 1225 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); 1226 wpa_sm_step(sm); 1227} 1228 1229 1230static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, 1231 const u8 *gnonce, u8 *gtk, size_t gtk_len) 1232{ 1233 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; 1234 u8 *pos; 1235 int ret = 0; 1236 1237 /* GTK = PRF-X(GMK, "Group key expansion", 1238 * AA || GNonce || Time || random data) 1239 * The example described in the IEEE 802.11 standard uses only AA and 1240 * GNonce as inputs here. Add some more entropy since this derivation 1241 * is done only at the Authenticator and as such, does not need to be 1242 * exactly same. 1243 */ 1244 os_memcpy(data, addr, ETH_ALEN); 1245 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); 1246 pos = data + ETH_ALEN + WPA_NONCE_LEN; 1247 wpa_get_ntp_timestamp(pos); 1248 pos += 8; 1249 if (random_get_bytes(pos, 16) < 0) 1250 ret = -1; 1251 1252#ifdef CONFIG_IEEE80211W 1253 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); 1254#else /* CONFIG_IEEE80211W */ 1255 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) 1256 < 0) 1257 ret = -1; 1258#endif /* CONFIG_IEEE80211W */ 1259 1260 return ret; 1261} 1262 1263 1264static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) 1265{ 1266 struct wpa_authenticator *wpa_auth = eloop_ctx; 1267 struct wpa_state_machine *sm = timeout_ctx; 1268 1269 sm->pending_1_of_4_timeout = 0; 1270 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); 1271 sm->TimeoutEvt = TRUE; 1272 wpa_sm_step(sm); 1273} 1274 1275 1276void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1277 struct wpa_state_machine *sm, int key_info, 1278 const u8 *key_rsc, const u8 *nonce, 1279 const u8 *kde, size_t kde_len, 1280 int keyidx, int encr, int force_version) 1281{ 1282 struct ieee802_1x_hdr *hdr; 1283 struct wpa_eapol_key *key; 1284 size_t len; 1285 int alg; 1286 int key_data_len, pad_len = 0; 1287 u8 *buf, *pos; 1288 int version, pairwise; 1289 int i; 1290 1291 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key); 1292 1293 if (force_version) 1294 version = force_version; 1295 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) 1296 version = WPA_KEY_INFO_TYPE_AKM_DEFINED; 1297 else if (wpa_use_aes_cmac(sm)) 1298 version = WPA_KEY_INFO_TYPE_AES_128_CMAC; 1299 else if (sm->pairwise != WPA_CIPHER_TKIP) 1300 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 1301 else 1302 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 1303 1304 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1305 1306 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " 1307 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " 1308 "encr=%d)", 1309 version, 1310 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, 1311 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, 1312 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, 1313 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, 1314 pairwise, (unsigned long) kde_len, keyidx, encr); 1315 1316 key_data_len = kde_len; 1317 1318 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1319 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1320 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { 1321 pad_len = key_data_len % 8; 1322 if (pad_len) 1323 pad_len = 8 - pad_len; 1324 key_data_len += pad_len + 8; 1325 } 1326 1327 len += key_data_len; 1328 1329 hdr = os_zalloc(len); 1330 if (hdr == NULL) 1331 return; 1332 hdr->version = wpa_auth->conf.eapol_version; 1333 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; 1334 hdr->length = host_to_be16(len - sizeof(*hdr)); 1335 key = (struct wpa_eapol_key *) (hdr + 1); 1336 1337 key->type = sm->wpa == WPA_VERSION_WPA2 ? 1338 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1339 key_info |= version; 1340 if (encr && sm->wpa == WPA_VERSION_WPA2) 1341 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1342 if (sm->wpa != WPA_VERSION_WPA2) 1343 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; 1344 WPA_PUT_BE16(key->key_info, key_info); 1345 1346 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; 1347 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); 1348 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) 1349 WPA_PUT_BE16(key->key_length, 0); 1350 1351 /* FIX: STSL: what to use as key_replay_counter? */ 1352 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { 1353 sm->key_replay[i].valid = sm->key_replay[i - 1].valid; 1354 os_memcpy(sm->key_replay[i].counter, 1355 sm->key_replay[i - 1].counter, 1356 WPA_REPLAY_COUNTER_LEN); 1357 } 1358 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); 1359 os_memcpy(key->replay_counter, sm->key_replay[0].counter, 1360 WPA_REPLAY_COUNTER_LEN); 1361 sm->key_replay[0].valid = TRUE; 1362 1363 if (nonce) 1364 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); 1365 1366 if (key_rsc) 1367 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); 1368 1369 if (kde && !encr) { 1370 os_memcpy(key + 1, kde, kde_len); 1371 WPA_PUT_BE16(key->key_data_length, kde_len); 1372 } else if (encr && kde) { 1373 buf = os_zalloc(key_data_len); 1374 if (buf == NULL) { 1375 os_free(hdr); 1376 return; 1377 } 1378 pos = buf; 1379 os_memcpy(pos, kde, kde_len); 1380 pos += kde_len; 1381 1382 if (pad_len) 1383 *pos++ = 0xdd; 1384 1385 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", 1386 buf, key_data_len); 1387 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1388 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1389 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1390 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf, 1391 (u8 *) (key + 1))) { 1392 os_free(hdr); 1393 os_free(buf); 1394 return; 1395 } 1396 WPA_PUT_BE16(key->key_data_length, key_data_len); 1397 } else { 1398 u8 ek[32]; 1399 os_memcpy(key->key_iv, 1400 sm->group->Counter + WPA_NONCE_LEN - 16, 16); 1401 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); 1402 os_memcpy(ek, key->key_iv, 16); 1403 os_memcpy(ek + 16, sm->PTK.kek, 16); 1404 os_memcpy(key + 1, buf, key_data_len); 1405 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len); 1406 WPA_PUT_BE16(key->key_data_length, key_data_len); 1407 } 1408 os_free(buf); 1409 } 1410 1411 if (key_info & WPA_KEY_INFO_MIC) { 1412 if (!sm->PTK_valid) { 1413 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 1414 "PTK not valid when sending EAPOL-Key " 1415 "frame"); 1416 os_free(hdr); 1417 return; 1418 } 1419 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len, 1420 key->key_mic); 1421#ifdef CONFIG_TESTING_OPTIONS 1422 if (!pairwise && 1423 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0d && 1424 drand48() < 1425 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { 1426 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1427 "Corrupting group EAPOL-Key Key MIC"); 1428 key->key_mic[0]++; 1429 } 1430#endif /* CONFIG_TESTING_OPTIONS */ 1431 } 1432 1433 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, 1434 1); 1435 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, 1436 sm->pairwise_set); 1437 os_free(hdr); 1438} 1439 1440 1441static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1442 struct wpa_state_machine *sm, int key_info, 1443 const u8 *key_rsc, const u8 *nonce, 1444 const u8 *kde, size_t kde_len, 1445 int keyidx, int encr) 1446{ 1447 int timeout_ms; 1448 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; 1449 int ctr; 1450 1451 if (sm == NULL) 1452 return; 1453 1454 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, 1455 keyidx, encr, 0); 1456 1457 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; 1458 if (ctr == 1 && wpa_auth->conf.tx_status) 1459 timeout_ms = pairwise ? eapol_key_timeout_first : 1460 eapol_key_timeout_first_group; 1461 else 1462 timeout_ms = eapol_key_timeout_subseq; 1463 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) 1464 sm->pending_1_of_4_timeout = 1; 1465 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " 1466 "counter %d)", timeout_ms, ctr); 1467 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, 1468 wpa_send_eapol_timeout, wpa_auth, sm); 1469} 1470 1471 1472static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len) 1473{ 1474 struct ieee802_1x_hdr *hdr; 1475 struct wpa_eapol_key *key; 1476 u16 key_info; 1477 int ret = 0; 1478 u8 mic[16]; 1479 1480 if (data_len < sizeof(*hdr) + sizeof(*key)) 1481 return -1; 1482 1483 hdr = (struct ieee802_1x_hdr *) data; 1484 key = (struct wpa_eapol_key *) (hdr + 1); 1485 key_info = WPA_GET_BE16(key->key_info); 1486 os_memcpy(mic, key->key_mic, 16); 1487 os_memset(key->key_mic, 0, 16); 1488 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK, 1489 data, data_len, key->key_mic) || 1490 os_memcmp(mic, key->key_mic, 16) != 0) 1491 ret = -1; 1492 os_memcpy(key->key_mic, mic, 16); 1493 return ret; 1494} 1495 1496 1497void wpa_remove_ptk(struct wpa_state_machine *sm) 1498{ 1499 sm->PTK_valid = FALSE; 1500 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1501 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); 1502 sm->pairwise_set = FALSE; 1503 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 1504} 1505 1506 1507int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event) 1508{ 1509 int remove_ptk = 1; 1510 1511 if (sm == NULL) 1512 return -1; 1513 1514 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1515 "event %d notification", event); 1516 1517 switch (event) { 1518 case WPA_AUTH: 1519 case WPA_ASSOC: 1520 break; 1521 case WPA_DEAUTH: 1522 case WPA_DISASSOC: 1523 sm->DeauthenticationRequest = TRUE; 1524 break; 1525 case WPA_REAUTH: 1526 case WPA_REAUTH_EAPOL: 1527 if (!sm->started) { 1528 /* 1529 * When using WPS, we may end up here if the STA 1530 * manages to re-associate without the previous STA 1531 * entry getting removed. Consequently, we need to make 1532 * sure that the WPA state machines gets initialized 1533 * properly at this point. 1534 */ 1535 wpa_printf(MSG_DEBUG, "WPA state machine had not been " 1536 "started - initialize now"); 1537 sm->started = 1; 1538 sm->Init = TRUE; 1539 if (wpa_sm_step(sm) == 1) 1540 return 1; /* should not really happen */ 1541 sm->Init = FALSE; 1542 sm->AuthenticationRequest = TRUE; 1543 break; 1544 } 1545 if (sm->GUpdateStationKeys) { 1546 /* 1547 * Reauthentication cancels the pending group key 1548 * update for this STA. 1549 */ 1550 sm->group->GKeyDoneStations--; 1551 sm->GUpdateStationKeys = FALSE; 1552 sm->PtkGroupInit = TRUE; 1553 } 1554 sm->ReAuthenticationRequest = TRUE; 1555 break; 1556 case WPA_ASSOC_FT: 1557#ifdef CONFIG_IEEE80211R 1558 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " 1559 "after association"); 1560 wpa_ft_install_ptk(sm); 1561 1562 /* Using FT protocol, not WPA auth state machine */ 1563 sm->ft_completed = 1; 1564 return 0; 1565#else /* CONFIG_IEEE80211R */ 1566 break; 1567#endif /* CONFIG_IEEE80211R */ 1568 } 1569 1570#ifdef CONFIG_IEEE80211R 1571 sm->ft_completed = 0; 1572#endif /* CONFIG_IEEE80211R */ 1573 1574#ifdef CONFIG_IEEE80211W 1575 if (sm->mgmt_frame_prot && event == WPA_AUTH) 1576 remove_ptk = 0; 1577#endif /* CONFIG_IEEE80211W */ 1578 1579 if (remove_ptk) { 1580 sm->PTK_valid = FALSE; 1581 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1582 1583 if (event != WPA_REAUTH_EAPOL) 1584 wpa_remove_ptk(sm); 1585 } 1586 1587 return wpa_sm_step(sm); 1588} 1589 1590 1591SM_STATE(WPA_PTK, INITIALIZE) 1592{ 1593 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); 1594 if (sm->Init) { 1595 /* Init flag is not cleared here, so avoid busy 1596 * loop by claiming nothing changed. */ 1597 sm->changed = FALSE; 1598 } 1599 1600 sm->keycount = 0; 1601 if (sm->GUpdateStationKeys) 1602 sm->group->GKeyDoneStations--; 1603 sm->GUpdateStationKeys = FALSE; 1604 if (sm->wpa == WPA_VERSION_WPA) 1605 sm->PInitAKeys = FALSE; 1606 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and 1607 * Local AA > Remote AA)) */) { 1608 sm->Pair = TRUE; 1609 } 1610 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); 1611 wpa_remove_ptk(sm); 1612 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); 1613 sm->TimeoutCtr = 0; 1614 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1615 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 1616 WPA_EAPOL_authorized, 0); 1617 } 1618} 1619 1620 1621SM_STATE(WPA_PTK, DISCONNECT) 1622{ 1623 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); 1624 sm->Disconnect = FALSE; 1625 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 1626} 1627 1628 1629SM_STATE(WPA_PTK, DISCONNECTED) 1630{ 1631 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); 1632 sm->DeauthenticationRequest = FALSE; 1633} 1634 1635 1636SM_STATE(WPA_PTK, AUTHENTICATION) 1637{ 1638 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); 1639 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1640 sm->PTK_valid = FALSE; 1641 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, 1642 1); 1643 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); 1644 sm->AuthenticationRequest = FALSE; 1645} 1646 1647 1648static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, 1649 struct wpa_group *group) 1650{ 1651 if (group->first_sta_seen) 1652 return; 1653 /* 1654 * System has run bit further than at the time hostapd was started 1655 * potentially very early during boot up. This provides better chances 1656 * of collecting more randomness on embedded systems. Re-initialize the 1657 * GMK and Counter here to improve their strength if there was not 1658 * enough entropy available immediately after system startup. 1659 */ 1660 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " 1661 "station"); 1662 if (random_pool_ready() != 1) { 1663 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 1664 "to proceed - reject first 4-way handshake"); 1665 group->reject_4way_hs_for_entropy = TRUE; 1666 } else { 1667 group->first_sta_seen = TRUE; 1668 group->reject_4way_hs_for_entropy = FALSE; 1669 } 1670 1671 wpa_group_init_gmk_and_counter(wpa_auth, group); 1672 wpa_gtk_update(wpa_auth, group); 1673 wpa_group_config_group_keys(wpa_auth, group); 1674} 1675 1676 1677SM_STATE(WPA_PTK, AUTHENTICATION2) 1678{ 1679 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); 1680 1681 wpa_group_ensure_init(sm->wpa_auth, sm->group); 1682 sm->ReAuthenticationRequest = FALSE; 1683 1684 /* 1685 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat 1686 * ambiguous. The Authenticator state machine uses a counter that is 1687 * incremented by one for each 4-way handshake. However, the security 1688 * analysis of 4-way handshake points out that unpredictable nonces 1689 * help in preventing precomputation attacks. Instead of the state 1690 * machine definition, use an unpredictable nonce value here to provide 1691 * stronger protection against potential precomputation attacks. 1692 */ 1693 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1694 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " 1695 "ANonce."); 1696 sm->Disconnect = TRUE; 1697 return; 1698 } 1699 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, 1700 WPA_NONCE_LEN); 1701 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more 1702 * logical place than INITIALIZE since AUTHENTICATION2 can be 1703 * re-entered on ReAuthenticationRequest without going through 1704 * INITIALIZE. */ 1705 sm->TimeoutCtr = 0; 1706} 1707 1708 1709SM_STATE(WPA_PTK, INITPMK) 1710{ 1711 u8 msk[2 * PMK_LEN]; 1712 size_t len = 2 * PMK_LEN; 1713 1714 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); 1715#ifdef CONFIG_IEEE80211R 1716 sm->xxkey_len = 0; 1717#endif /* CONFIG_IEEE80211R */ 1718 if (sm->pmksa) { 1719 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); 1720 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); 1721 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { 1722 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " 1723 "(len=%lu)", (unsigned long) len); 1724 os_memcpy(sm->PMK, msk, PMK_LEN); 1725#ifdef CONFIG_IEEE80211R 1726 if (len >= 2 * PMK_LEN) { 1727 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); 1728 sm->xxkey_len = PMK_LEN; 1729 } 1730#endif /* CONFIG_IEEE80211R */ 1731 } else { 1732 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK"); 1733 } 1734 1735 sm->req_replay_counter_used = 0; 1736 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this 1737 * will break reauthentication since EAPOL state machines may not be 1738 * get into AUTHENTICATING state that clears keyRun before WPA state 1739 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK 1740 * state and takes PMK from the previously used AAA Key. This will 1741 * eventually fail in 4-Way Handshake because Supplicant uses PMK 1742 * derived from the new AAA Key. Setting keyRun = FALSE here seems to 1743 * be good workaround for this issue. */ 1744 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); 1745} 1746 1747 1748SM_STATE(WPA_PTK, INITPSK) 1749{ 1750 const u8 *psk; 1751 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); 1752 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL); 1753 if (psk) { 1754 os_memcpy(sm->PMK, psk, PMK_LEN); 1755#ifdef CONFIG_IEEE80211R 1756 os_memcpy(sm->xxkey, psk, PMK_LEN); 1757 sm->xxkey_len = PMK_LEN; 1758#endif /* CONFIG_IEEE80211R */ 1759 } 1760 sm->req_replay_counter_used = 0; 1761} 1762 1763 1764SM_STATE(WPA_PTK, PTKSTART) 1765{ 1766 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; 1767 size_t pmkid_len = 0; 1768 1769 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); 1770 sm->PTKRequest = FALSE; 1771 sm->TimeoutEvt = FALSE; 1772 1773 sm->TimeoutCtr++; 1774 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1775 /* No point in sending the EAPOL-Key - we will disconnect 1776 * immediately following this. */ 1777 return; 1778 } 1779 1780 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1781 "sending 1/4 msg of 4-Way Handshake"); 1782 /* 1783 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only 1784 * one possible PSK for this STA. 1785 */ 1786 if (sm->wpa == WPA_VERSION_WPA2 && 1787 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 1788 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) { 1789 pmkid = buf; 1790 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 1791 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; 1792 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; 1793 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); 1794 if (sm->pmksa) 1795 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], 1796 sm->pmksa->pmkid, PMKID_LEN); 1797 else { 1798 /* 1799 * Calculate PMKID since no PMKSA cache entry was 1800 * available with pre-calculated PMKID. 1801 */ 1802 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, 1803 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], 1804 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1805 } 1806 } 1807 wpa_send_eapol(sm->wpa_auth, sm, 1808 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, 1809 sm->ANonce, pmkid, pmkid_len, 0, 0); 1810} 1811 1812 1813static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk, 1814 struct wpa_ptk *ptk) 1815{ 1816 size_t ptk_len = wpa_cipher_key_len(sm->pairwise) + 32; 1817#ifdef CONFIG_IEEE80211R 1818 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 1819 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len); 1820#endif /* CONFIG_IEEE80211R */ 1821 1822 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", 1823 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce, 1824 (u8 *) ptk, ptk_len, 1825 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1826 1827 return 0; 1828} 1829 1830 1831SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) 1832{ 1833 struct wpa_ptk PTK; 1834 int ok = 0; 1835 const u8 *pmk = NULL; 1836 1837 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); 1838 sm->EAPOLKeyReceived = FALSE; 1839 sm->update_snonce = FALSE; 1840 1841 /* WPA with IEEE 802.1X: use the derived PMK from EAP 1842 * WPA-PSK: iterate through possible PSKs and select the one matching 1843 * the packet */ 1844 for (;;) { 1845 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1846 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 1847 sm->p2p_dev_addr, pmk); 1848 if (pmk == NULL) 1849 break; 1850 } else 1851 pmk = sm->PMK; 1852 1853 wpa_derive_ptk(sm, pmk, &PTK); 1854 1855 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key, 1856 sm->last_rx_eapol_key_len) == 0) { 1857 ok = 1; 1858 break; 1859 } 1860 1861 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 1862 break; 1863 } 1864 1865 if (!ok) { 1866 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1867 "invalid MIC in msg 2/4 of 4-Way Handshake"); 1868 return; 1869 } 1870 1871#ifdef CONFIG_IEEE80211R 1872 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 1873 /* 1874 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches 1875 * with the value we derived. 1876 */ 1877 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name, 1878 WPA_PMK_NAME_LEN) != 0) { 1879 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1880 "PMKR1Name mismatch in FT 4-way " 1881 "handshake"); 1882 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " 1883 "Supplicant", 1884 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); 1885 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 1886 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 1887 return; 1888 } 1889 } 1890#endif /* CONFIG_IEEE80211R */ 1891 1892 sm->pending_1_of_4_timeout = 0; 1893 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 1894 1895 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1896 /* PSK may have changed from the previous choice, so update 1897 * state machine data based on whatever PSK was selected here. 1898 */ 1899 os_memcpy(sm->PMK, pmk, PMK_LEN); 1900 } 1901 1902 sm->MICVerified = TRUE; 1903 1904 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 1905 sm->PTK_valid = TRUE; 1906} 1907 1908 1909SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) 1910{ 1911 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); 1912 sm->TimeoutCtr = 0; 1913} 1914 1915 1916#ifdef CONFIG_IEEE80211W 1917 1918static int ieee80211w_kde_len(struct wpa_state_machine *sm) 1919{ 1920 if (sm->mgmt_frame_prot) { 1921 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde); 1922 } 1923 1924 return 0; 1925} 1926 1927 1928static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 1929{ 1930 struct wpa_igtk_kde igtk; 1931 struct wpa_group *gsm = sm->group; 1932 u8 rsc[WPA_KEY_RSC_LEN]; 1933 1934 if (!sm->mgmt_frame_prot) 1935 return pos; 1936 1937 igtk.keyid[0] = gsm->GN_igtk; 1938 igtk.keyid[1] = 0; 1939 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || 1940 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0) 1941 os_memset(igtk.pn, 0, sizeof(igtk.pn)); 1942 else 1943 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn)); 1944 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); 1945 if (sm->wpa_auth->conf.disable_gtk) { 1946 /* 1947 * Provide unique random IGTK to each STA to prevent use of 1948 * IGTK in the BSS. 1949 */ 1950 if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0) 1951 return pos; 1952 } 1953 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, 1954 (const u8 *) &igtk, sizeof(igtk), NULL, 0); 1955 1956 return pos; 1957} 1958 1959#else /* CONFIG_IEEE80211W */ 1960 1961static int ieee80211w_kde_len(struct wpa_state_machine *sm) 1962{ 1963 return 0; 1964} 1965 1966 1967static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 1968{ 1969 return pos; 1970} 1971 1972#endif /* CONFIG_IEEE80211W */ 1973 1974 1975SM_STATE(WPA_PTK, PTKINITNEGOTIATING) 1976{ 1977 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; 1978 size_t gtk_len, kde_len; 1979 struct wpa_group *gsm = sm->group; 1980 u8 *wpa_ie; 1981 int wpa_ie_len, secure, keyidx, encr = 0; 1982 1983 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); 1984 sm->TimeoutEvt = FALSE; 1985 1986 sm->TimeoutCtr++; 1987 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1988 /* No point in sending the EAPOL-Key - we will disconnect 1989 * immediately following this. */ 1990 return; 1991 } 1992 1993 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], 1994 GTK[GN], IGTK, [FTIE], [TIE * 2]) 1995 */ 1996 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 1997 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 1998 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ 1999 wpa_ie = sm->wpa_auth->wpa_ie; 2000 wpa_ie_len = sm->wpa_auth->wpa_ie_len; 2001 if (sm->wpa == WPA_VERSION_WPA && 2002 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && 2003 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { 2004 /* WPA-only STA, remove RSN IE */ 2005 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2006 wpa_ie_len = wpa_ie[1] + 2; 2007 } 2008 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2009 "sending 3/4 msg of 4-Way Handshake"); 2010 if (sm->wpa == WPA_VERSION_WPA2) { 2011 /* WPA2 send GTK in the 4-way handshake */ 2012 secure = 1; 2013 gtk = gsm->GTK[gsm->GN - 1]; 2014 gtk_len = gsm->GTK_len; 2015 if (sm->wpa_auth->conf.disable_gtk) { 2016 /* 2017 * Provide unique random GTK to each STA to prevent use 2018 * of GTK in the BSS. 2019 */ 2020 if (random_get_bytes(dummy_gtk, gtk_len) < 0) 2021 return; 2022 gtk = dummy_gtk; 2023 } 2024 keyidx = gsm->GN; 2025 _rsc = rsc; 2026 encr = 1; 2027 } else { 2028 /* WPA does not include GTK in msg 3/4 */ 2029 secure = 0; 2030 gtk = NULL; 2031 gtk_len = 0; 2032 keyidx = 0; 2033 _rsc = NULL; 2034 if (sm->rx_eapol_key_secure) { 2035 /* 2036 * It looks like Windows 7 supplicant tries to use 2037 * Secure bit in msg 2/4 after having reported Michael 2038 * MIC failure and it then rejects the 4-way handshake 2039 * if msg 3/4 does not set Secure bit. Work around this 2040 * by setting the Secure bit here even in the case of 2041 * WPA if the supplicant used it first. 2042 */ 2043 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2044 "STA used Secure bit in WPA msg 2/4 - " 2045 "set Secure for 3/4 as workaround"); 2046 secure = 1; 2047 } 2048 } 2049 2050 kde_len = wpa_ie_len + ieee80211w_kde_len(sm); 2051 if (gtk) 2052 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; 2053#ifdef CONFIG_IEEE80211R 2054 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2055 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ 2056 kde_len += 300; /* FTIE + 2 * TIE */ 2057 } 2058#endif /* CONFIG_IEEE80211R */ 2059#ifdef CONFIG_P2P 2060 if (WPA_GET_BE32(sm->ip_addr) > 0) 2061 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4; 2062#endif /* CONFIG_P2P */ 2063 kde = os_malloc(kde_len); 2064 if (kde == NULL) 2065 return; 2066 2067 pos = kde; 2068 os_memcpy(pos, wpa_ie, wpa_ie_len); 2069 pos += wpa_ie_len; 2070#ifdef CONFIG_IEEE80211R 2071 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2072 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); 2073 if (res < 0) { 2074 wpa_printf(MSG_ERROR, "FT: Failed to insert " 2075 "PMKR1Name into RSN IE in EAPOL-Key data"); 2076 os_free(kde); 2077 return; 2078 } 2079 pos += res; 2080 } 2081#endif /* CONFIG_IEEE80211R */ 2082 if (gtk) { 2083 u8 hdr[2]; 2084 hdr[0] = keyidx & 0x03; 2085 hdr[1] = 0; 2086 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2087 gtk, gtk_len); 2088 } 2089 pos = ieee80211w_kde_add(sm, pos); 2090 2091#ifdef CONFIG_IEEE80211R 2092 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2093 int res; 2094 struct wpa_auth_config *conf; 2095 2096 conf = &sm->wpa_auth->conf; 2097 res = wpa_write_ftie(conf, conf->r0_key_holder, 2098 conf->r0_key_holder_len, 2099 NULL, NULL, pos, kde + kde_len - pos, 2100 NULL, 0); 2101 if (res < 0) { 2102 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " 2103 "into EAPOL-Key Key Data"); 2104 os_free(kde); 2105 return; 2106 } 2107 pos += res; 2108 2109 /* TIE[ReassociationDeadline] (TU) */ 2110 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2111 *pos++ = 5; 2112 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; 2113 WPA_PUT_LE32(pos, conf->reassociation_deadline); 2114 pos += 4; 2115 2116 /* TIE[KeyLifetime] (seconds) */ 2117 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2118 *pos++ = 5; 2119 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; 2120 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); 2121 pos += 4; 2122 } 2123#endif /* CONFIG_IEEE80211R */ 2124#ifdef CONFIG_P2P 2125 if (WPA_GET_BE32(sm->ip_addr) > 0) { 2126 u8 addr[3 * 4]; 2127 os_memcpy(addr, sm->ip_addr, 4); 2128 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4); 2129 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4); 2130 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC, 2131 addr, sizeof(addr), NULL, 0); 2132 } 2133#endif /* CONFIG_P2P */ 2134 2135 wpa_send_eapol(sm->wpa_auth, sm, 2136 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | 2137 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | 2138 WPA_KEY_INFO_KEY_TYPE, 2139 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); 2140 os_free(kde); 2141} 2142 2143 2144SM_STATE(WPA_PTK, PTKINITDONE) 2145{ 2146 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); 2147 sm->EAPOLKeyReceived = FALSE; 2148 if (sm->Pair) { 2149 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); 2150 int klen = wpa_cipher_key_len(sm->pairwise); 2151 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 2152 sm->PTK.tk1, klen)) { 2153 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 2154 return; 2155 } 2156 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 2157 sm->pairwise_set = TRUE; 2158 2159 if (sm->wpa_auth->conf.wpa_ptk_rekey) { 2160 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 2161 eloop_register_timeout(sm->wpa_auth->conf. 2162 wpa_ptk_rekey, 0, wpa_rekey_ptk, 2163 sm->wpa_auth, sm); 2164 } 2165 2166 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2167 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2168 WPA_EAPOL_authorized, 1); 2169 } 2170 } 2171 2172 if (0 /* IBSS == TRUE */) { 2173 sm->keycount++; 2174 if (sm->keycount == 2) { 2175 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2176 WPA_EAPOL_portValid, 1); 2177 } 2178 } else { 2179 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 2180 1); 2181 } 2182 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); 2183 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); 2184 if (sm->wpa == WPA_VERSION_WPA) 2185 sm->PInitAKeys = TRUE; 2186 else 2187 sm->has_GTK = TRUE; 2188 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2189 "pairwise key handshake completed (%s)", 2190 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2191 2192#ifdef CONFIG_IEEE80211R 2193 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); 2194#endif /* CONFIG_IEEE80211R */ 2195} 2196 2197 2198SM_STEP(WPA_PTK) 2199{ 2200 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 2201 2202 if (sm->Init) 2203 SM_ENTER(WPA_PTK, INITIALIZE); 2204 else if (sm->Disconnect 2205 /* || FIX: dot11RSNAConfigSALifetime timeout */) { 2206 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 2207 "WPA_PTK: sm->Disconnect"); 2208 SM_ENTER(WPA_PTK, DISCONNECT); 2209 } 2210 else if (sm->DeauthenticationRequest) 2211 SM_ENTER(WPA_PTK, DISCONNECTED); 2212 else if (sm->AuthenticationRequest) 2213 SM_ENTER(WPA_PTK, AUTHENTICATION); 2214 else if (sm->ReAuthenticationRequest) 2215 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2216 else if (sm->PTKRequest) 2217 SM_ENTER(WPA_PTK, PTKSTART); 2218 else switch (sm->wpa_ptk_state) { 2219 case WPA_PTK_INITIALIZE: 2220 break; 2221 case WPA_PTK_DISCONNECT: 2222 SM_ENTER(WPA_PTK, DISCONNECTED); 2223 break; 2224 case WPA_PTK_DISCONNECTED: 2225 SM_ENTER(WPA_PTK, INITIALIZE); 2226 break; 2227 case WPA_PTK_AUTHENTICATION: 2228 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2229 break; 2230 case WPA_PTK_AUTHENTICATION2: 2231 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 2232 wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2233 WPA_EAPOL_keyRun) > 0) 2234 SM_ENTER(WPA_PTK, INITPMK); 2235 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) 2236 /* FIX: && 802.1X::keyRun */) 2237 SM_ENTER(WPA_PTK, INITPSK); 2238 break; 2239 case WPA_PTK_INITPMK: 2240 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2241 WPA_EAPOL_keyAvailable) > 0) 2242 SM_ENTER(WPA_PTK, PTKSTART); 2243 else { 2244 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2245 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2246 "INITPMK - keyAvailable = false"); 2247 SM_ENTER(WPA_PTK, DISCONNECT); 2248 } 2249 break; 2250 case WPA_PTK_INITPSK: 2251 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, 2252 NULL)) 2253 SM_ENTER(WPA_PTK, PTKSTART); 2254 else { 2255 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2256 "no PSK configured for the STA"); 2257 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2258 SM_ENTER(WPA_PTK, DISCONNECT); 2259 } 2260 break; 2261 case WPA_PTK_PTKSTART: 2262 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2263 sm->EAPOLKeyPairwise) 2264 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2265 else if (sm->TimeoutCtr > 2266 (int) dot11RSNAConfigPairwiseUpdateCount) { 2267 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2268 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2269 "PTKSTART: Retry limit %d reached", 2270 dot11RSNAConfigPairwiseUpdateCount); 2271 SM_ENTER(WPA_PTK, DISCONNECT); 2272 } else if (sm->TimeoutEvt) 2273 SM_ENTER(WPA_PTK, PTKSTART); 2274 break; 2275 case WPA_PTK_PTKCALCNEGOTIATING: 2276 if (sm->MICVerified) 2277 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); 2278 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2279 sm->EAPOLKeyPairwise) 2280 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2281 else if (sm->TimeoutEvt) 2282 SM_ENTER(WPA_PTK, PTKSTART); 2283 break; 2284 case WPA_PTK_PTKCALCNEGOTIATING2: 2285 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2286 break; 2287 case WPA_PTK_PTKINITNEGOTIATING: 2288 if (sm->update_snonce) 2289 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2290 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2291 sm->EAPOLKeyPairwise && sm->MICVerified) 2292 SM_ENTER(WPA_PTK, PTKINITDONE); 2293 else if (sm->TimeoutCtr > 2294 (int) dot11RSNAConfigPairwiseUpdateCount) { 2295 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2296 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2297 "PTKINITNEGOTIATING: Retry limit %d " 2298 "reached", 2299 dot11RSNAConfigPairwiseUpdateCount); 2300 SM_ENTER(WPA_PTK, DISCONNECT); 2301 } else if (sm->TimeoutEvt) 2302 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2303 break; 2304 case WPA_PTK_PTKINITDONE: 2305 break; 2306 } 2307} 2308 2309 2310SM_STATE(WPA_PTK_GROUP, IDLE) 2311{ 2312 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); 2313 if (sm->Init) { 2314 /* Init flag is not cleared here, so avoid busy 2315 * loop by claiming nothing changed. */ 2316 sm->changed = FALSE; 2317 } 2318 sm->GTimeoutCtr = 0; 2319} 2320 2321 2322SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) 2323{ 2324 u8 rsc[WPA_KEY_RSC_LEN]; 2325 struct wpa_group *gsm = sm->group; 2326 u8 *kde, *pos, hdr[2]; 2327 size_t kde_len; 2328 u8 *gtk, dummy_gtk[32]; 2329 2330 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); 2331 2332 sm->GTimeoutCtr++; 2333 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { 2334 /* No point in sending the EAPOL-Key - we will disconnect 2335 * immediately following this. */ 2336 return; 2337 } 2338 2339 if (sm->wpa == WPA_VERSION_WPA) 2340 sm->PInitAKeys = FALSE; 2341 sm->TimeoutEvt = FALSE; 2342 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ 2343 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2344 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) 2345 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2346 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2347 "sending 1/2 msg of Group Key Handshake"); 2348 2349 gtk = gsm->GTK[gsm->GN - 1]; 2350 if (sm->wpa_auth->conf.disable_gtk) { 2351 /* 2352 * Provide unique random GTK to each STA to prevent use 2353 * of GTK in the BSS. 2354 */ 2355 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) 2356 return; 2357 gtk = dummy_gtk; 2358 } 2359 if (sm->wpa == WPA_VERSION_WPA2) { 2360 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + 2361 ieee80211w_kde_len(sm); 2362 kde = os_malloc(kde_len); 2363 if (kde == NULL) 2364 return; 2365 2366 pos = kde; 2367 hdr[0] = gsm->GN & 0x03; 2368 hdr[1] = 0; 2369 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2370 gtk, gsm->GTK_len); 2371 pos = ieee80211w_kde_add(sm, pos); 2372 } else { 2373 kde = gtk; 2374 pos = kde + gsm->GTK_len; 2375 } 2376 2377 wpa_send_eapol(sm->wpa_auth, sm, 2378 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | 2379 WPA_KEY_INFO_ACK | 2380 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), 2381 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1); 2382 if (sm->wpa == WPA_VERSION_WPA2) 2383 os_free(kde); 2384} 2385 2386 2387SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) 2388{ 2389 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); 2390 sm->EAPOLKeyReceived = FALSE; 2391 if (sm->GUpdateStationKeys) 2392 sm->group->GKeyDoneStations--; 2393 sm->GUpdateStationKeys = FALSE; 2394 sm->GTimeoutCtr = 0; 2395 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ 2396 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2397 "group key handshake completed (%s)", 2398 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2399 sm->has_GTK = TRUE; 2400} 2401 2402 2403SM_STATE(WPA_PTK_GROUP, KEYERROR) 2404{ 2405 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); 2406 if (sm->GUpdateStationKeys) 2407 sm->group->GKeyDoneStations--; 2408 sm->GUpdateStationKeys = FALSE; 2409 sm->Disconnect = TRUE; 2410} 2411 2412 2413SM_STEP(WPA_PTK_GROUP) 2414{ 2415 if (sm->Init || sm->PtkGroupInit) { 2416 SM_ENTER(WPA_PTK_GROUP, IDLE); 2417 sm->PtkGroupInit = FALSE; 2418 } else switch (sm->wpa_ptk_group_state) { 2419 case WPA_PTK_GROUP_IDLE: 2420 if (sm->GUpdateStationKeys || 2421 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) 2422 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2423 break; 2424 case WPA_PTK_GROUP_REKEYNEGOTIATING: 2425 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2426 !sm->EAPOLKeyPairwise && sm->MICVerified) 2427 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); 2428 else if (sm->GTimeoutCtr > 2429 (int) dot11RSNAConfigGroupUpdateCount) 2430 SM_ENTER(WPA_PTK_GROUP, KEYERROR); 2431 else if (sm->TimeoutEvt) 2432 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2433 break; 2434 case WPA_PTK_GROUP_KEYERROR: 2435 SM_ENTER(WPA_PTK_GROUP, IDLE); 2436 break; 2437 case WPA_PTK_GROUP_REKEYESTABLISHED: 2438 SM_ENTER(WPA_PTK_GROUP, IDLE); 2439 break; 2440 } 2441} 2442 2443 2444static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 2445 struct wpa_group *group) 2446{ 2447 int ret = 0; 2448 2449 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2450 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2451 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", 2452 wpa_auth->addr, group->GNonce, 2453 group->GTK[group->GN - 1], group->GTK_len) < 0) 2454 ret = -1; 2455 wpa_hexdump_key(MSG_DEBUG, "GTK", 2456 group->GTK[group->GN - 1], group->GTK_len); 2457 2458#ifdef CONFIG_IEEE80211W 2459 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2460 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2461 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2462 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", 2463 wpa_auth->addr, group->GNonce, 2464 group->IGTK[group->GN_igtk - 4], 2465 WPA_IGTK_LEN) < 0) 2466 ret = -1; 2467 wpa_hexdump_key(MSG_DEBUG, "IGTK", 2468 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN); 2469 } 2470#endif /* CONFIG_IEEE80211W */ 2471 2472 return ret; 2473} 2474 2475 2476static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, 2477 struct wpa_group *group) 2478{ 2479 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2480 "GTK_INIT (VLAN-ID %d)", group->vlan_id); 2481 group->changed = FALSE; /* GInit is not cleared here; avoid loop */ 2482 group->wpa_group_state = WPA_GROUP_GTK_INIT; 2483 2484 /* GTK[0..N] = 0 */ 2485 os_memset(group->GTK, 0, sizeof(group->GTK)); 2486 group->GN = 1; 2487 group->GM = 2; 2488#ifdef CONFIG_IEEE80211W 2489 group->GN_igtk = 4; 2490 group->GM_igtk = 5; 2491#endif /* CONFIG_IEEE80211W */ 2492 /* GTK[GN] = CalcGTK() */ 2493 wpa_gtk_update(wpa_auth, group); 2494} 2495 2496 2497static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) 2498{ 2499 if (ctx != NULL && ctx != sm->group) 2500 return 0; 2501 2502 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { 2503 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2504 "Not in PTKINITDONE; skip Group Key update"); 2505 sm->GUpdateStationKeys = FALSE; 2506 return 0; 2507 } 2508 if (sm->GUpdateStationKeys) { 2509 /* 2510 * This should not really happen, so add a debug log entry. 2511 * Since we clear the GKeyDoneStations before the loop, the 2512 * station needs to be counted here anyway. 2513 */ 2514 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2515 "GUpdateStationKeys was already set when " 2516 "marking station for GTK rekeying"); 2517 } 2518 2519 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ 2520 if (sm->is_wnmsleep) 2521 return 0; 2522 2523 sm->group->GKeyDoneStations++; 2524 sm->GUpdateStationKeys = TRUE; 2525 2526 wpa_sm_step(sm); 2527 return 0; 2528} 2529 2530 2531#ifdef CONFIG_WNM 2532/* update GTK when exiting WNM-Sleep Mode */ 2533void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) 2534{ 2535 if (sm == NULL || sm->is_wnmsleep) 2536 return; 2537 2538 wpa_group_update_sta(sm, NULL); 2539} 2540 2541 2542void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) 2543{ 2544 if (sm) 2545 sm->is_wnmsleep = !!flag; 2546} 2547 2548 2549int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2550{ 2551 struct wpa_group *gsm = sm->group; 2552 u8 *start = pos; 2553 2554 /* 2555 * GTK subelement: 2556 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 2557 * Key[5..32] 2558 */ 2559 *pos++ = WNM_SLEEP_SUBELEM_GTK; 2560 *pos++ = 11 + gsm->GTK_len; 2561 /* Key ID in B0-B1 of Key Info */ 2562 WPA_PUT_LE16(pos, gsm->GN & 0x03); 2563 pos += 2; 2564 *pos++ = gsm->GTK_len; 2565 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) 2566 return 0; 2567 pos += 8; 2568 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2569 pos += gsm->GTK_len; 2570 2571 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", 2572 gsm->GN); 2573 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", 2574 gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2575 2576 return pos - start; 2577} 2578 2579 2580#ifdef CONFIG_IEEE80211W 2581int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2582{ 2583 struct wpa_group *gsm = sm->group; 2584 u8 *start = pos; 2585 2586 /* 2587 * IGTK subelement: 2588 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] 2589 */ 2590 *pos++ = WNM_SLEEP_SUBELEM_IGTK; 2591 *pos++ = 2 + 6 + WPA_IGTK_LEN; 2592 WPA_PUT_LE16(pos, gsm->GN_igtk); 2593 pos += 2; 2594 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) 2595 return 0; 2596 pos += 6; 2597 2598 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); 2599 pos += WPA_IGTK_LEN; 2600 2601 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", 2602 gsm->GN_igtk); 2603 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", 2604 gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); 2605 2606 return pos - start; 2607} 2608#endif /* CONFIG_IEEE80211W */ 2609#endif /* CONFIG_WNM */ 2610 2611 2612static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, 2613 struct wpa_group *group) 2614{ 2615 int tmp; 2616 2617 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2618 "SETKEYS (VLAN-ID %d)", group->vlan_id); 2619 group->changed = TRUE; 2620 group->wpa_group_state = WPA_GROUP_SETKEYS; 2621 group->GTKReKey = FALSE; 2622 tmp = group->GM; 2623 group->GM = group->GN; 2624 group->GN = tmp; 2625#ifdef CONFIG_IEEE80211W 2626 tmp = group->GM_igtk; 2627 group->GM_igtk = group->GN_igtk; 2628 group->GN_igtk = tmp; 2629#endif /* CONFIG_IEEE80211W */ 2630 /* "GKeyDoneStations = GNoStations" is done in more robust way by 2631 * counting the STAs that are marked with GUpdateStationKeys instead of 2632 * including all STAs that could be in not-yet-completed state. */ 2633 wpa_gtk_update(wpa_auth, group); 2634 2635 if (group->GKeyDoneStations) { 2636 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " 2637 "GKeyDoneStations=%d when starting new GTK rekey", 2638 group->GKeyDoneStations); 2639 group->GKeyDoneStations = 0; 2640 } 2641 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); 2642 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", 2643 group->GKeyDoneStations); 2644} 2645 2646 2647static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 2648 struct wpa_group *group) 2649{ 2650 int ret = 0; 2651 2652 if (wpa_auth_set_key(wpa_auth, group->vlan_id, 2653 wpa_cipher_to_alg(wpa_auth->conf.wpa_group), 2654 broadcast_ether_addr, group->GN, 2655 group->GTK[group->GN - 1], group->GTK_len) < 0) 2656 ret = -1; 2657 2658#ifdef CONFIG_IEEE80211W 2659 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION && 2660 wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK, 2661 broadcast_ether_addr, group->GN_igtk, 2662 group->IGTK[group->GN_igtk - 4], 2663 WPA_IGTK_LEN) < 0) 2664 ret = -1; 2665#endif /* CONFIG_IEEE80211W */ 2666 2667 return ret; 2668} 2669 2670 2671static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx) 2672{ 2673 if (sm->group == ctx) { 2674 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR 2675 " for discconnection due to fatal failure", 2676 MAC2STR(sm->addr)); 2677 sm->Disconnect = TRUE; 2678 } 2679 2680 return 0; 2681} 2682 2683 2684static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth, 2685 struct wpa_group *group) 2686{ 2687 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE"); 2688 group->changed = TRUE; 2689 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE; 2690 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group); 2691} 2692 2693 2694static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, 2695 struct wpa_group *group) 2696{ 2697 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2698 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); 2699 group->changed = TRUE; 2700 group->wpa_group_state = WPA_GROUP_SETKEYSDONE; 2701 2702 if (wpa_group_config_group_keys(wpa_auth, group) < 0) { 2703 wpa_group_fatal_failure(wpa_auth, group); 2704 return -1; 2705 } 2706 2707 return 0; 2708} 2709 2710 2711static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 2712 struct wpa_group *group) 2713{ 2714 if (group->GInit) { 2715 wpa_group_gtk_init(wpa_auth, group); 2716 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) { 2717 /* Do not allow group operations */ 2718 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && 2719 group->GTKAuthenticator) { 2720 wpa_group_setkeysdone(wpa_auth, group); 2721 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && 2722 group->GTKReKey) { 2723 wpa_group_setkeys(wpa_auth, group); 2724 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { 2725 if (group->GKeyDoneStations == 0) 2726 wpa_group_setkeysdone(wpa_auth, group); 2727 else if (group->GTKReKey) 2728 wpa_group_setkeys(wpa_auth, group); 2729 } 2730} 2731 2732 2733static int wpa_sm_step(struct wpa_state_machine *sm) 2734{ 2735 if (sm == NULL) 2736 return 0; 2737 2738 if (sm->in_step_loop) { 2739 /* This should not happen, but if it does, make sure we do not 2740 * end up freeing the state machine too early by exiting the 2741 * recursive call. */ 2742 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); 2743 return 0; 2744 } 2745 2746 sm->in_step_loop = 1; 2747 do { 2748 if (sm->pending_deinit) 2749 break; 2750 2751 sm->changed = FALSE; 2752 sm->wpa_auth->group->changed = FALSE; 2753 2754 SM_STEP_RUN(WPA_PTK); 2755 if (sm->pending_deinit) 2756 break; 2757 SM_STEP_RUN(WPA_PTK_GROUP); 2758 if (sm->pending_deinit) 2759 break; 2760 wpa_group_sm_step(sm->wpa_auth, sm->group); 2761 } while (sm->changed || sm->wpa_auth->group->changed); 2762 sm->in_step_loop = 0; 2763 2764 if (sm->pending_deinit) { 2765 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " 2766 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 2767 wpa_free_sta_sm(sm); 2768 return 1; 2769 } 2770 return 0; 2771} 2772 2773 2774static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) 2775{ 2776 struct wpa_state_machine *sm = eloop_ctx; 2777 wpa_sm_step(sm); 2778} 2779 2780 2781void wpa_auth_sm_notify(struct wpa_state_machine *sm) 2782{ 2783 if (sm == NULL) 2784 return; 2785 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); 2786} 2787 2788 2789void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) 2790{ 2791 int tmp, i; 2792 struct wpa_group *group; 2793 2794 if (wpa_auth == NULL) 2795 return; 2796 2797 group = wpa_auth->group; 2798 2799 for (i = 0; i < 2; i++) { 2800 tmp = group->GM; 2801 group->GM = group->GN; 2802 group->GN = tmp; 2803#ifdef CONFIG_IEEE80211W 2804 tmp = group->GM_igtk; 2805 group->GM_igtk = group->GN_igtk; 2806 group->GN_igtk = tmp; 2807#endif /* CONFIG_IEEE80211W */ 2808 wpa_gtk_update(wpa_auth, group); 2809 wpa_group_config_group_keys(wpa_auth, group); 2810 } 2811} 2812 2813 2814static const char * wpa_bool_txt(int bool) 2815{ 2816 return bool ? "TRUE" : "FALSE"; 2817} 2818 2819 2820#define RSN_SUITE "%02x-%02x-%02x-%d" 2821#define RSN_SUITE_ARG(s) \ 2822((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 2823 2824int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) 2825{ 2826 int len = 0, ret; 2827 char pmkid_txt[PMKID_LEN * 2 + 1]; 2828#ifdef CONFIG_RSN_PREAUTH 2829 const int preauth = 1; 2830#else /* CONFIG_RSN_PREAUTH */ 2831 const int preauth = 0; 2832#endif /* CONFIG_RSN_PREAUTH */ 2833 2834 if (wpa_auth == NULL) 2835 return len; 2836 2837 ret = os_snprintf(buf + len, buflen - len, 2838 "dot11RSNAOptionImplemented=TRUE\n" 2839 "dot11RSNAPreauthenticationImplemented=%s\n" 2840 "dot11RSNAEnabled=%s\n" 2841 "dot11RSNAPreauthenticationEnabled=%s\n", 2842 wpa_bool_txt(preauth), 2843 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), 2844 wpa_bool_txt(wpa_auth->conf.rsn_preauth)); 2845 if (ret < 0 || (size_t) ret >= buflen - len) 2846 return len; 2847 len += ret; 2848 2849 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 2850 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); 2851 2852 ret = os_snprintf( 2853 buf + len, buflen - len, 2854 "dot11RSNAConfigVersion=%u\n" 2855 "dot11RSNAConfigPairwiseKeysSupported=9999\n" 2856 /* FIX: dot11RSNAConfigGroupCipher */ 2857 /* FIX: dot11RSNAConfigGroupRekeyMethod */ 2858 /* FIX: dot11RSNAConfigGroupRekeyTime */ 2859 /* FIX: dot11RSNAConfigGroupRekeyPackets */ 2860 "dot11RSNAConfigGroupRekeyStrict=%u\n" 2861 "dot11RSNAConfigGroupUpdateCount=%u\n" 2862 "dot11RSNAConfigPairwiseUpdateCount=%u\n" 2863 "dot11RSNAConfigGroupCipherSize=%u\n" 2864 "dot11RSNAConfigPMKLifetime=%u\n" 2865 "dot11RSNAConfigPMKReauthThreshold=%u\n" 2866 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" 2867 "dot11RSNAConfigSATimeout=%u\n" 2868 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 2869 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 2870 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 2871 "dot11RSNAPMKIDUsed=%s\n" 2872 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 2873 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 2874 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 2875 "dot11RSNATKIPCounterMeasuresInvoked=%u\n" 2876 "dot11RSNA4WayHandshakeFailures=%u\n" 2877 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", 2878 RSN_VERSION, 2879 !!wpa_auth->conf.wpa_strict_rekey, 2880 dot11RSNAConfigGroupUpdateCount, 2881 dot11RSNAConfigPairwiseUpdateCount, 2882 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, 2883 dot11RSNAConfigPMKLifetime, 2884 dot11RSNAConfigPMKReauthThreshold, 2885 dot11RSNAConfigSATimeout, 2886 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), 2887 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), 2888 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), 2889 pmkid_txt, 2890 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), 2891 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), 2892 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), 2893 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, 2894 wpa_auth->dot11RSNA4WayHandshakeFailures); 2895 if (ret < 0 || (size_t) ret >= buflen - len) 2896 return len; 2897 len += ret; 2898 2899 /* TODO: dot11RSNAConfigPairwiseCiphersTable */ 2900 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ 2901 2902 /* Private MIB */ 2903 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", 2904 wpa_auth->group->wpa_group_state); 2905 if (ret < 0 || (size_t) ret >= buflen - len) 2906 return len; 2907 len += ret; 2908 2909 return len; 2910} 2911 2912 2913int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) 2914{ 2915 int len = 0, ret; 2916 u32 pairwise = 0; 2917 2918 if (sm == NULL) 2919 return 0; 2920 2921 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ 2922 2923 /* dot11RSNAStatsEntry */ 2924 2925 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? 2926 WPA_PROTO_RSN : WPA_PROTO_WPA, 2927 sm->pairwise); 2928 if (pairwise == 0) 2929 return 0; 2930 2931 ret = os_snprintf( 2932 buf + len, buflen - len, 2933 /* TODO: dot11RSNAStatsIndex */ 2934 "dot11RSNAStatsSTAAddress=" MACSTR "\n" 2935 "dot11RSNAStatsVersion=1\n" 2936 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" 2937 /* TODO: dot11RSNAStatsTKIPICVErrors */ 2938 "dot11RSNAStatsTKIPLocalMICFailures=%u\n" 2939 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" 2940 /* TODO: dot11RSNAStatsCCMPReplays */ 2941 /* TODO: dot11RSNAStatsCCMPDecryptErrors */ 2942 /* TODO: dot11RSNAStatsTKIPReplays */, 2943 MAC2STR(sm->addr), 2944 RSN_SUITE_ARG(pairwise), 2945 sm->dot11RSNAStatsTKIPLocalMICFailures, 2946 sm->dot11RSNAStatsTKIPRemoteMICFailures); 2947 if (ret < 0 || (size_t) ret >= buflen - len) 2948 return len; 2949 len += ret; 2950 2951 /* Private MIB */ 2952 ret = os_snprintf(buf + len, buflen - len, 2953 "hostapdWPAPTKState=%d\n" 2954 "hostapdWPAPTKGroupState=%d\n", 2955 sm->wpa_ptk_state, 2956 sm->wpa_ptk_group_state); 2957 if (ret < 0 || (size_t) ret >= buflen - len) 2958 return len; 2959 len += ret; 2960 2961 return len; 2962} 2963 2964 2965void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) 2966{ 2967 if (wpa_auth) 2968 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; 2969} 2970 2971 2972int wpa_auth_pairwise_set(struct wpa_state_machine *sm) 2973{ 2974 return sm && sm->pairwise_set; 2975} 2976 2977 2978int wpa_auth_get_pairwise(struct wpa_state_machine *sm) 2979{ 2980 return sm->pairwise; 2981} 2982 2983 2984int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) 2985{ 2986 if (sm == NULL) 2987 return -1; 2988 return sm->wpa_key_mgmt; 2989} 2990 2991 2992int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) 2993{ 2994 if (sm == NULL) 2995 return 0; 2996 return sm->wpa; 2997} 2998 2999 3000int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, 3001 struct rsn_pmksa_cache_entry *entry) 3002{ 3003 if (sm == NULL || sm->pmksa != entry) 3004 return -1; 3005 sm->pmksa = NULL; 3006 return 0; 3007} 3008 3009 3010struct rsn_pmksa_cache_entry * 3011wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) 3012{ 3013 return sm ? sm->pmksa : NULL; 3014} 3015 3016 3017void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) 3018{ 3019 if (sm) 3020 sm->dot11RSNAStatsTKIPLocalMICFailures++; 3021} 3022 3023 3024const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) 3025{ 3026 if (wpa_auth == NULL) 3027 return NULL; 3028 *len = wpa_auth->wpa_ie_len; 3029 return wpa_auth->wpa_ie; 3030} 3031 3032 3033int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, 3034 int session_timeout, struct eapol_state_machine *eapol) 3035{ 3036 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || 3037 sm->wpa_auth->conf.disable_pmksa_caching) 3038 return -1; 3039 3040 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, 3041 sm->wpa_auth->addr, sm->addr, session_timeout, 3042 eapol, sm->wpa_key_mgmt)) 3043 return 0; 3044 3045 return -1; 3046} 3047 3048 3049int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, 3050 const u8 *pmk, size_t len, const u8 *sta_addr, 3051 int session_timeout, 3052 struct eapol_state_machine *eapol) 3053{ 3054 if (wpa_auth == NULL) 3055 return -1; 3056 3057 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr, 3058 sta_addr, session_timeout, eapol, 3059 WPA_KEY_MGMT_IEEE8021X)) 3060 return 0; 3061 3062 return -1; 3063} 3064 3065 3066void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth, 3067 const u8 *sta_addr) 3068{ 3069 struct rsn_pmksa_cache_entry *pmksa; 3070 3071 if (wpa_auth == NULL || wpa_auth->pmksa == NULL) 3072 return; 3073 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL); 3074 if (pmksa) { 3075 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for " 3076 MACSTR " based on request", MAC2STR(sta_addr)); 3077 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa); 3078 } 3079} 3080 3081 3082static struct wpa_group * 3083wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) 3084{ 3085 struct wpa_group *group; 3086 3087 if (wpa_auth == NULL || wpa_auth->group == NULL) 3088 return NULL; 3089 3090 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", 3091 vlan_id); 3092 group = wpa_group_init(wpa_auth, vlan_id, 0); 3093 if (group == NULL) 3094 return NULL; 3095 3096 group->next = wpa_auth->group->next; 3097 wpa_auth->group->next = group; 3098 3099 return group; 3100} 3101 3102 3103int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) 3104{ 3105 struct wpa_group *group; 3106 3107 if (sm == NULL || sm->wpa_auth == NULL) 3108 return 0; 3109 3110 group = sm->wpa_auth->group; 3111 while (group) { 3112 if (group->vlan_id == vlan_id) 3113 break; 3114 group = group->next; 3115 } 3116 3117 if (group == NULL) { 3118 group = wpa_auth_add_group(sm->wpa_auth, vlan_id); 3119 if (group == NULL) 3120 return -1; 3121 } 3122 3123 if (sm->group == group) 3124 return 0; 3125 3126 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 3127 return -1; 3128 3129 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " 3130 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); 3131 3132 sm->group = group; 3133 return 0; 3134} 3135 3136 3137void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, 3138 struct wpa_state_machine *sm, int ack) 3139{ 3140 if (wpa_auth == NULL || sm == NULL) 3141 return; 3142 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR 3143 " ack=%d", MAC2STR(sm->addr), ack); 3144 if (sm->pending_1_of_4_timeout && ack) { 3145 /* 3146 * Some deployed supplicant implementations update their SNonce 3147 * for each EAPOL-Key 2/4 message even within the same 4-way 3148 * handshake and then fail to use the first SNonce when 3149 * deriving the PTK. This results in unsuccessful 4-way 3150 * handshake whenever the relatively short initial timeout is 3151 * reached and EAPOL-Key 1/4 is retransmitted. Try to work 3152 * around this by increasing the timeout now that we know that 3153 * the station has received the frame. 3154 */ 3155 int timeout_ms = eapol_key_timeout_subseq; 3156 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " 3157 "timeout by %u ms because of acknowledged frame", 3158 timeout_ms); 3159 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 3160 eloop_register_timeout(timeout_ms / 1000, 3161 (timeout_ms % 1000) * 1000, 3162 wpa_send_eapol_timeout, wpa_auth, sm); 3163 } 3164} 3165 3166 3167int wpa_auth_uses_sae(struct wpa_state_machine *sm) 3168{ 3169 if (sm == NULL) 3170 return 0; 3171 return wpa_key_mgmt_sae(sm->wpa_key_mgmt); 3172} 3173 3174 3175int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm) 3176{ 3177 if (sm == NULL) 3178 return 0; 3179 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE; 3180} 3181 3182 3183#ifdef CONFIG_P2P 3184int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr) 3185{ 3186 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0) 3187 return -1; 3188 os_memcpy(addr, sm->ip_addr, 4); 3189 return 0; 3190} 3191#endif /* CONFIG_P2P */ 3192