1 /* 2 * IEEE 802.11 RSN / WPA Authenticator 3 * Copyright (c) 2004-2013, Jouni Malinen <j (at) 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 34 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx); 35 static int wpa_sm_step(struct wpa_state_machine *sm); 36 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len); 37 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx); 38 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 39 struct wpa_group *group); 40 static void wpa_request_new_ptk(struct wpa_state_machine *sm); 41 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 42 struct wpa_group *group); 43 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 44 struct wpa_group *group); 45 46 static const u32 dot11RSNAConfigGroupUpdateCount = 4; 47 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4; 48 static const u32 eapol_key_timeout_first = 100; /* ms */ 49 static const u32 eapol_key_timeout_subseq = 1000; /* ms */ 50 static const u32 eapol_key_timeout_first_group = 500; /* ms */ 51 52 /* TODO: make these configurable */ 53 static const int dot11RSNAConfigPMKLifetime = 43200; 54 static const int dot11RSNAConfigPMKReauthThreshold = 70; 55 static const int dot11RSNAConfigSATimeout = 60; 56 57 58 static 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 67 static 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 76 static 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 85 static 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 97 static 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 } 104 105 106 static 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 } 116 117 118 static 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 } 125 126 127 static inline int 128 wpa_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 } 136 137 138 int 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 } 146 147 148 int 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 } 156 157 158 void 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 } 165 166 167 void 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 } 190 191 192 static 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 } 201 202 203 static 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 } 218 219 220 static 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 } 238 239 240 static 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 } 259 260 261 static 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 } 270 271 272 static 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 } 278 279 280 static 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 } 286 287 288 static 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 } 318 319 320 static 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 */ 374 struct 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 } 443 444 445 int 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 */ 464 void 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 */ 506 int 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 } 532 533 534 struct wpa_state_machine * 535 wpa_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 } 555 556 557 int 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 /* Go to PTKINITDONE state to allow GTK rekeying */ 569 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE; 570 return 0; 571 } 572 #endif /* CONFIG_IEEE80211R */ 573 574 if (sm->started) { 575 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); 576 sm->ReAuthenticationRequest = TRUE; 577 return wpa_sm_step(sm); 578 } 579 580 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 581 "start authentication"); 582 sm->started = 1; 583 584 sm->Init = TRUE; 585 if (wpa_sm_step(sm) == 1) 586 return 1; /* should not really happen */ 587 sm->Init = FALSE; 588 sm->AuthenticationRequest = TRUE; 589 return wpa_sm_step(sm); 590 } 591 592 593 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) 594 { 595 /* WPA/RSN was not used - clear WPA state. This is needed if the STA 596 * reassociates back to the same AP while the previous entry for the 597 * STA has not yet been removed. */ 598 if (sm == NULL) 599 return; 600 601 sm->wpa_key_mgmt = 0; 602 } 603 604 605 static void wpa_free_sta_sm(struct wpa_state_machine *sm) 606 { 607 #ifdef CONFIG_P2P 608 if (WPA_GET_BE32(sm->ip_addr)) { 609 u32 start; 610 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP " 611 "address %u.%u.%u.%u from " MACSTR, 612 sm->ip_addr[0], sm->ip_addr[1], 613 sm->ip_addr[2], sm->ip_addr[3], 614 MAC2STR(sm->addr)); 615 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start); 616 bitfield_clear(sm->wpa_auth->ip_pool, 617 WPA_GET_BE32(sm->ip_addr) - start); 618 } 619 #endif /* CONFIG_P2P */ 620 if (sm->GUpdateStationKeys) { 621 sm->group->GKeyDoneStations--; 622 sm->GUpdateStationKeys = FALSE; 623 } 624 #ifdef CONFIG_IEEE80211R 625 os_free(sm->assoc_resp_ftie); 626 wpabuf_free(sm->ft_pending_req_ies); 627 #endif /* CONFIG_IEEE80211R */ 628 os_free(sm->last_rx_eapol_key); 629 os_free(sm->wpa_ie); 630 os_free(sm); 631 } 632 633 634 void wpa_auth_sta_deinit(struct wpa_state_machine *sm) 635 { 636 if (sm == NULL) 637 return; 638 639 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { 640 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 641 "strict rekeying - force GTK rekey since STA " 642 "is leaving"); 643 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); 644 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, 645 NULL); 646 } 647 648 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 649 sm->pending_1_of_4_timeout = 0; 650 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); 651 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 652 if (sm->in_step_loop) { 653 /* Must not free state machine while wpa_sm_step() is running. 654 * Freeing will be completed in the end of wpa_sm_step(). */ 655 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " 656 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 657 sm->pending_deinit = 1; 658 } else 659 wpa_free_sta_sm(sm); 660 } 661 662 663 static void wpa_request_new_ptk(struct wpa_state_machine *sm) 664 { 665 if (sm == NULL) 666 return; 667 668 sm->PTKRequest = TRUE; 669 sm->PTK_valid = 0; 670 } 671 672 673 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, 674 const u8 *replay_counter) 675 { 676 int i; 677 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 678 if (!ctr[i].valid) 679 break; 680 if (os_memcmp(replay_counter, ctr[i].counter, 681 WPA_REPLAY_COUNTER_LEN) == 0) 682 return 1; 683 } 684 return 0; 685 } 686 687 688 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, 689 const u8 *replay_counter) 690 { 691 int i; 692 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 693 if (ctr[i].valid && 694 (replay_counter == NULL || 695 os_memcmp(replay_counter, ctr[i].counter, 696 WPA_REPLAY_COUNTER_LEN) == 0)) 697 ctr[i].valid = FALSE; 698 } 699 } 700 701 702 #ifdef CONFIG_IEEE80211R 703 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, 704 struct wpa_state_machine *sm, 705 struct wpa_eapol_ie_parse *kde) 706 { 707 struct wpa_ie_data ie; 708 struct rsn_mdie *mdie; 709 710 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || 711 ie.num_pmkid != 1 || ie.pmkid == NULL) { 712 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " 713 "FT 4-way handshake message 2/4"); 714 return -1; 715 } 716 717 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); 718 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", 719 sm->sup_pmk_r1_name, PMKID_LEN); 720 721 if (!kde->mdie || !kde->ftie) { 722 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " 723 "message 2/4", kde->mdie ? "FTIE" : "MDIE"); 724 return -1; 725 } 726 727 mdie = (struct rsn_mdie *) (kde->mdie + 2); 728 if (kde->mdie[1] < sizeof(struct rsn_mdie) || 729 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, 730 MOBILITY_DOMAIN_ID_LEN) != 0) { 731 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); 732 return -1; 733 } 734 735 if (sm->assoc_resp_ftie && 736 (kde->ftie[1] != sm->assoc_resp_ftie[1] || 737 os_memcmp(kde->ftie, sm->assoc_resp_ftie, 738 2 + sm->assoc_resp_ftie[1]) != 0)) { 739 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); 740 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", 741 kde->ftie, kde->ftie_len); 742 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", 743 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); 744 return -1; 745 } 746 747 return 0; 748 } 749 #endif /* CONFIG_IEEE80211R */ 750 751 752 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth, 753 struct wpa_state_machine *sm, int group) 754 { 755 /* Supplicant reported a Michael MIC error */ 756 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 757 "received EAPOL-Key Error Request " 758 "(STA detected Michael MIC failure (group=%d))", 759 group); 760 761 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { 762 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 763 "ignore Michael MIC failure report since " 764 "group cipher is not TKIP"); 765 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { 766 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 767 "ignore Michael MIC failure report since " 768 "pairwise cipher is not TKIP"); 769 } else { 770 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0) 771 return 1; /* STA entry was removed */ 772 sm->dot11RSNAStatsTKIPRemoteMICFailures++; 773 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; 774 } 775 776 /* 777 * Error report is not a request for a new key handshake, but since 778 * Authenticator may do it, let's change the keys now anyway. 779 */ 780 wpa_request_new_ptk(sm); 781 return 0; 782 } 783 784 785 void wpa_receive(struct wpa_authenticator *wpa_auth, 786 struct wpa_state_machine *sm, 787 u8 *data, size_t data_len) 788 { 789 struct ieee802_1x_hdr *hdr; 790 struct wpa_eapol_key *key; 791 u16 key_info, key_data_length; 792 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, 793 SMK_M1, SMK_M3, SMK_ERROR } msg; 794 char *msgtxt; 795 struct wpa_eapol_ie_parse kde; 796 int ft; 797 const u8 *eapol_key_ie; 798 size_t eapol_key_ie_len; 799 800 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 801 return; 802 803 if (data_len < sizeof(*hdr) + sizeof(*key)) 804 return; 805 806 hdr = (struct ieee802_1x_hdr *) data; 807 key = (struct wpa_eapol_key *) (hdr + 1); 808 key_info = WPA_GET_BE16(key->key_info); 809 key_data_length = WPA_GET_BE16(key->key_data_length); 810 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR 811 " key_info=0x%x type=%u key_data_length=%u", 812 MAC2STR(sm->addr), key_info, key->type, key_data_length); 813 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) { 814 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " 815 "key_data overflow (%d > %lu)", 816 key_data_length, 817 (unsigned long) (data_len - sizeof(*hdr) - 818 sizeof(*key))); 819 return; 820 } 821 822 if (sm->wpa == WPA_VERSION_WPA2) { 823 if (key->type == EAPOL_KEY_TYPE_WPA) { 824 /* 825 * Some deployed station implementations seem to send 826 * msg 4/4 with incorrect type value in WPA2 mode. 827 */ 828 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " 829 "with unexpected WPA type in RSN mode"); 830 } else if (key->type != EAPOL_KEY_TYPE_RSN) { 831 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 832 "unexpected type %d in RSN mode", 833 key->type); 834 return; 835 } 836 } else { 837 if (key->type != EAPOL_KEY_TYPE_WPA) { 838 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 839 "unexpected type %d in WPA mode", 840 key->type); 841 return; 842 } 843 } 844 845 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, 846 WPA_NONCE_LEN); 847 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", 848 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 849 850 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys 851 * are set */ 852 853 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == 854 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { 855 if (key_info & WPA_KEY_INFO_ERROR) { 856 msg = SMK_ERROR; 857 msgtxt = "SMK Error"; 858 } else { 859 msg = SMK_M1; 860 msgtxt = "SMK M1"; 861 } 862 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 863 msg = SMK_M3; 864 msgtxt = "SMK M3"; 865 } else if (key_info & WPA_KEY_INFO_REQUEST) { 866 msg = REQUEST; 867 msgtxt = "Request"; 868 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { 869 msg = GROUP_2; 870 msgtxt = "2/2 Group"; 871 } else if (key_data_length == 0) { 872 msg = PAIRWISE_4; 873 msgtxt = "4/4 Pairwise"; 874 } else { 875 msg = PAIRWISE_2; 876 msgtxt = "2/4 Pairwise"; 877 } 878 879 /* TODO: key_info type validation for PeerKey */ 880 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || 881 msg == GROUP_2) { 882 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 883 if (sm->pairwise == WPA_CIPHER_CCMP || 884 sm->pairwise == WPA_CIPHER_GCMP) { 885 if (wpa_use_aes_cmac(sm) && 886 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN && 887 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 888 wpa_auth_logger(wpa_auth, sm->addr, 889 LOGGER_WARNING, 890 "advertised support for " 891 "AES-128-CMAC, but did not " 892 "use it"); 893 return; 894 } 895 896 if (!wpa_use_aes_cmac(sm) && 897 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 898 wpa_auth_logger(wpa_auth, sm->addr, 899 LOGGER_WARNING, 900 "did not use HMAC-SHA1-AES " 901 "with CCMP/GCMP"); 902 return; 903 } 904 } 905 } 906 907 if (key_info & WPA_KEY_INFO_REQUEST) { 908 if (sm->req_replay_counter_used && 909 os_memcmp(key->replay_counter, sm->req_replay_counter, 910 WPA_REPLAY_COUNTER_LEN) <= 0) { 911 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 912 "received EAPOL-Key request with " 913 "replayed counter"); 914 return; 915 } 916 } 917 918 if (!(key_info & WPA_KEY_INFO_REQUEST) && 919 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { 920 int i; 921 922 if (msg == PAIRWISE_2 && 923 wpa_replay_counter_valid(sm->prev_key_replay, 924 key->replay_counter) && 925 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 926 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) 927 { 928 /* 929 * Some supplicant implementations (e.g., Windows XP 930 * WZC) update SNonce for each EAPOL-Key 2/4. This 931 * breaks the workaround on accepting any of the 932 * pending requests, so allow the SNonce to be updated 933 * even if we have already sent out EAPOL-Key 3/4. 934 */ 935 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 936 "Process SNonce update from STA " 937 "based on retransmitted EAPOL-Key " 938 "1/4"); 939 sm->update_snonce = 1; 940 wpa_replay_counter_mark_invalid(sm->prev_key_replay, 941 key->replay_counter); 942 goto continue_processing; 943 } 944 945 if (msg == PAIRWISE_2 && 946 wpa_replay_counter_valid(sm->prev_key_replay, 947 key->replay_counter) && 948 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { 949 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 950 "ignore retransmitted EAPOL-Key %s - " 951 "SNonce did not change", msgtxt); 952 } else { 953 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 954 "received EAPOL-Key %s with " 955 "unexpected replay counter", msgtxt); 956 } 957 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 958 if (!sm->key_replay[i].valid) 959 break; 960 wpa_hexdump(MSG_DEBUG, "pending replay counter", 961 sm->key_replay[i].counter, 962 WPA_REPLAY_COUNTER_LEN); 963 } 964 wpa_hexdump(MSG_DEBUG, "received replay counter", 965 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 966 return; 967 } 968 969 continue_processing: 970 switch (msg) { 971 case PAIRWISE_2: 972 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && 973 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && 974 (!sm->update_snonce || 975 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { 976 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 977 "received EAPOL-Key msg 2/4 in " 978 "invalid state (%d) - dropped", 979 sm->wpa_ptk_state); 980 return; 981 } 982 random_add_randomness(key->key_nonce, WPA_NONCE_LEN); 983 if (sm->group->reject_4way_hs_for_entropy) { 984 /* 985 * The system did not have enough entropy to generate 986 * strong random numbers. Reject the first 4-way 987 * handshake(s) and collect some entropy based on the 988 * information from it. Once enough entropy is 989 * available, the next atempt will trigger GMK/Key 990 * Counter update and the station will be allowed to 991 * continue. 992 */ 993 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " 994 "collect more entropy for random number " 995 "generation"); 996 random_mark_pool_ready(); 997 wpa_sta_disconnect(wpa_auth, sm->addr); 998 return; 999 } 1000 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length, 1001 &kde) < 0) { 1002 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1003 "received EAPOL-Key msg 2/4 with " 1004 "invalid Key Data contents"); 1005 return; 1006 } 1007 if (kde.rsn_ie) { 1008 eapol_key_ie = kde.rsn_ie; 1009 eapol_key_ie_len = kde.rsn_ie_len; 1010 } else if (kde.osen) { 1011 eapol_key_ie = kde.osen; 1012 eapol_key_ie_len = kde.osen_len; 1013 } else { 1014 eapol_key_ie = kde.wpa_ie; 1015 eapol_key_ie_len = kde.wpa_ie_len; 1016 } 1017 ft = sm->wpa == WPA_VERSION_WPA2 && 1018 wpa_key_mgmt_ft(sm->wpa_key_mgmt); 1019 if (sm->wpa_ie == NULL || 1020 wpa_compare_rsn_ie(ft, 1021 sm->wpa_ie, sm->wpa_ie_len, 1022 eapol_key_ie, eapol_key_ie_len)) { 1023 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1024 "WPA IE from (Re)AssocReq did not " 1025 "match with msg 2/4"); 1026 if (sm->wpa_ie) { 1027 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", 1028 sm->wpa_ie, sm->wpa_ie_len); 1029 } 1030 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", 1031 eapol_key_ie, eapol_key_ie_len); 1032 /* MLME-DEAUTHENTICATE.request */ 1033 wpa_sta_disconnect(wpa_auth, sm->addr); 1034 return; 1035 } 1036 #ifdef CONFIG_IEEE80211R 1037 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { 1038 wpa_sta_disconnect(wpa_auth, sm->addr); 1039 return; 1040 } 1041 #endif /* CONFIG_IEEE80211R */ 1042 #ifdef CONFIG_P2P 1043 if (kde.ip_addr_req && kde.ip_addr_req[0] && 1044 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) { 1045 int idx; 1046 wpa_printf(MSG_DEBUG, "P2P: IP address requested in " 1047 "EAPOL-Key exchange"); 1048 idx = bitfield_get_first_zero(wpa_auth->ip_pool); 1049 if (idx >= 0) { 1050 u32 start = WPA_GET_BE32(wpa_auth->conf. 1051 ip_addr_start); 1052 bitfield_set(wpa_auth->ip_pool, idx); 1053 WPA_PUT_BE32(sm->ip_addr, start + idx); 1054 wpa_printf(MSG_DEBUG, "P2P: Assigned IP " 1055 "address %u.%u.%u.%u to " MACSTR, 1056 sm->ip_addr[0], sm->ip_addr[1], 1057 sm->ip_addr[2], sm->ip_addr[3], 1058 MAC2STR(sm->addr)); 1059 } 1060 } 1061 #endif /* CONFIG_P2P */ 1062 break; 1063 case PAIRWISE_4: 1064 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || 1065 !sm->PTK_valid) { 1066 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1067 "received EAPOL-Key msg 4/4 in " 1068 "invalid state (%d) - dropped", 1069 sm->wpa_ptk_state); 1070 return; 1071 } 1072 break; 1073 case GROUP_2: 1074 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING 1075 || !sm->PTK_valid) { 1076 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1077 "received EAPOL-Key msg 2/2 in " 1078 "invalid state (%d) - dropped", 1079 sm->wpa_ptk_group_state); 1080 return; 1081 } 1082 break; 1083 #ifdef CONFIG_PEERKEY 1084 case SMK_M1: 1085 case SMK_M3: 1086 case SMK_ERROR: 1087 if (!wpa_auth->conf.peerkey) { 1088 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " 1089 "PeerKey use disabled - ignoring message"); 1090 return; 1091 } 1092 if (!sm->PTK_valid) { 1093 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1094 "received EAPOL-Key msg SMK in " 1095 "invalid state - dropped"); 1096 return; 1097 } 1098 break; 1099 #else /* CONFIG_PEERKEY */ 1100 case SMK_M1: 1101 case SMK_M3: 1102 case SMK_ERROR: 1103 return; /* STSL disabled - ignore SMK messages */ 1104 #endif /* CONFIG_PEERKEY */ 1105 case REQUEST: 1106 break; 1107 } 1108 1109 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1110 "received EAPOL-Key frame (%s)", msgtxt); 1111 1112 if (key_info & WPA_KEY_INFO_ACK) { 1113 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1114 "received invalid EAPOL-Key: Key Ack set"); 1115 return; 1116 } 1117 1118 if (!(key_info & WPA_KEY_INFO_MIC)) { 1119 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1120 "received invalid EAPOL-Key: Key MIC not set"); 1121 return; 1122 } 1123 1124 sm->MICVerified = FALSE; 1125 if (sm->PTK_valid && !sm->update_snonce) { 1126 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) { 1127 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1128 "received EAPOL-Key with invalid MIC"); 1129 return; 1130 } 1131 sm->MICVerified = TRUE; 1132 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 1133 sm->pending_1_of_4_timeout = 0; 1134 } 1135 1136 if (key_info & WPA_KEY_INFO_REQUEST) { 1137 if (sm->MICVerified) { 1138 sm->req_replay_counter_used = 1; 1139 os_memcpy(sm->req_replay_counter, key->replay_counter, 1140 WPA_REPLAY_COUNTER_LEN); 1141 } else { 1142 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1143 "received EAPOL-Key request with " 1144 "invalid MIC"); 1145 return; 1146 } 1147 1148 /* 1149 * TODO: should decrypt key data field if encryption was used; 1150 * even though MAC address KDE is not normally encrypted, 1151 * supplicant is allowed to encrypt it. 1152 */ 1153 if (msg == SMK_ERROR) { 1154 #ifdef CONFIG_PEERKEY 1155 wpa_smk_error(wpa_auth, sm, key); 1156 #endif /* CONFIG_PEERKEY */ 1157 return; 1158 } else if (key_info & WPA_KEY_INFO_ERROR) { 1159 if (wpa_receive_error_report( 1160 wpa_auth, sm, 1161 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0) 1162 return; /* STA entry was removed */ 1163 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1164 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1165 "received EAPOL-Key Request for new " 1166 "4-Way Handshake"); 1167 wpa_request_new_ptk(sm); 1168 #ifdef CONFIG_PEERKEY 1169 } else if (msg == SMK_M1) { 1170 wpa_smk_m1(wpa_auth, sm, key); 1171 #endif /* CONFIG_PEERKEY */ 1172 } else if (key_data_length > 0 && 1173 wpa_parse_kde_ies((const u8 *) (key + 1), 1174 key_data_length, &kde) == 0 && 1175 kde.mac_addr) { 1176 } else { 1177 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1178 "received EAPOL-Key Request for GTK " 1179 "rekeying"); 1180 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 1181 wpa_rekey_gtk(wpa_auth, NULL); 1182 } 1183 } else { 1184 /* Do not allow the same key replay counter to be reused. */ 1185 wpa_replay_counter_mark_invalid(sm->key_replay, 1186 key->replay_counter); 1187 1188 if (msg == PAIRWISE_2) { 1189 /* 1190 * Maintain a copy of the pending EAPOL-Key frames in 1191 * case the EAPOL-Key frame was retransmitted. This is 1192 * needed to allow EAPOL-Key msg 2/4 reply to another 1193 * pending msg 1/4 to update the SNonce to work around 1194 * unexpected supplicant behavior. 1195 */ 1196 os_memcpy(sm->prev_key_replay, sm->key_replay, 1197 sizeof(sm->key_replay)); 1198 } else { 1199 os_memset(sm->prev_key_replay, 0, 1200 sizeof(sm->prev_key_replay)); 1201 } 1202 1203 /* 1204 * Make sure old valid counters are not accepted anymore and 1205 * do not get copied again. 1206 */ 1207 wpa_replay_counter_mark_invalid(sm->key_replay, NULL); 1208 } 1209 1210 #ifdef CONFIG_PEERKEY 1211 if (msg == SMK_M3) { 1212 wpa_smk_m3(wpa_auth, sm, key); 1213 return; 1214 } 1215 #endif /* CONFIG_PEERKEY */ 1216 1217 os_free(sm->last_rx_eapol_key); 1218 sm->last_rx_eapol_key = os_malloc(data_len); 1219 if (sm->last_rx_eapol_key == NULL) 1220 return; 1221 os_memcpy(sm->last_rx_eapol_key, data, data_len); 1222 sm->last_rx_eapol_key_len = data_len; 1223 1224 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); 1225 sm->EAPOLKeyReceived = TRUE; 1226 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1227 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); 1228 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); 1229 wpa_sm_step(sm); 1230 } 1231 1232 1233 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, 1234 const u8 *gnonce, u8 *gtk, size_t gtk_len) 1235 { 1236 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; 1237 u8 *pos; 1238 int ret = 0; 1239 1240 /* GTK = PRF-X(GMK, "Group key expansion", 1241 * AA || GNonce || Time || random data) 1242 * The example described in the IEEE 802.11 standard uses only AA and 1243 * GNonce as inputs here. Add some more entropy since this derivation 1244 * is done only at the Authenticator and as such, does not need to be 1245 * exactly same. 1246 */ 1247 os_memcpy(data, addr, ETH_ALEN); 1248 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); 1249 pos = data + ETH_ALEN + WPA_NONCE_LEN; 1250 wpa_get_ntp_timestamp(pos); 1251 pos += 8; 1252 if (random_get_bytes(pos, 16) < 0) 1253 ret = -1; 1254 1255 #ifdef CONFIG_IEEE80211W 1256 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); 1257 #else /* CONFIG_IEEE80211W */ 1258 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) 1259 < 0) 1260 ret = -1; 1261 #endif /* CONFIG_IEEE80211W */ 1262 1263 return ret; 1264 } 1265 1266 1267 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) 1268 { 1269 struct wpa_authenticator *wpa_auth = eloop_ctx; 1270 struct wpa_state_machine *sm = timeout_ctx; 1271 1272 sm->pending_1_of_4_timeout = 0; 1273 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); 1274 sm->TimeoutEvt = TRUE; 1275 wpa_sm_step(sm); 1276 } 1277 1278 1279 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1280 struct wpa_state_machine *sm, int key_info, 1281 const u8 *key_rsc, const u8 *nonce, 1282 const u8 *kde, size_t kde_len, 1283 int keyidx, int encr, int force_version) 1284 { 1285 struct ieee802_1x_hdr *hdr; 1286 struct wpa_eapol_key *key; 1287 size_t len; 1288 int alg; 1289 int key_data_len, pad_len = 0; 1290 u8 *buf, *pos; 1291 int version, pairwise; 1292 int i; 1293 1294 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key); 1295 1296 if (force_version) 1297 version = force_version; 1298 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) 1299 version = WPA_KEY_INFO_TYPE_AKM_DEFINED; 1300 else if (wpa_use_aes_cmac(sm)) 1301 version = WPA_KEY_INFO_TYPE_AES_128_CMAC; 1302 else if (sm->pairwise != WPA_CIPHER_TKIP) 1303 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 1304 else 1305 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 1306 1307 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1308 1309 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " 1310 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " 1311 "encr=%d)", 1312 version, 1313 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, 1314 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, 1315 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, 1316 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, 1317 pairwise, (unsigned long) kde_len, keyidx, encr); 1318 1319 key_data_len = kde_len; 1320 1321 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1322 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1323 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { 1324 pad_len = key_data_len % 8; 1325 if (pad_len) 1326 pad_len = 8 - pad_len; 1327 key_data_len += pad_len + 8; 1328 } 1329 1330 len += key_data_len; 1331 1332 hdr = os_zalloc(len); 1333 if (hdr == NULL) 1334 return; 1335 hdr->version = wpa_auth->conf.eapol_version; 1336 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; 1337 hdr->length = host_to_be16(len - sizeof(*hdr)); 1338 key = (struct wpa_eapol_key *) (hdr + 1); 1339 1340 key->type = sm->wpa == WPA_VERSION_WPA2 ? 1341 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1342 key_info |= version; 1343 if (encr && sm->wpa == WPA_VERSION_WPA2) 1344 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1345 if (sm->wpa != WPA_VERSION_WPA2) 1346 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; 1347 WPA_PUT_BE16(key->key_info, key_info); 1348 1349 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; 1350 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); 1351 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) 1352 WPA_PUT_BE16(key->key_length, 0); 1353 1354 /* FIX: STSL: what to use as key_replay_counter? */ 1355 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { 1356 sm->key_replay[i].valid = sm->key_replay[i - 1].valid; 1357 os_memcpy(sm->key_replay[i].counter, 1358 sm->key_replay[i - 1].counter, 1359 WPA_REPLAY_COUNTER_LEN); 1360 } 1361 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); 1362 os_memcpy(key->replay_counter, sm->key_replay[0].counter, 1363 WPA_REPLAY_COUNTER_LEN); 1364 sm->key_replay[0].valid = TRUE; 1365 1366 if (nonce) 1367 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); 1368 1369 if (key_rsc) 1370 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); 1371 1372 if (kde && !encr) { 1373 os_memcpy(key + 1, kde, kde_len); 1374 WPA_PUT_BE16(key->key_data_length, kde_len); 1375 } else if (encr && kde) { 1376 buf = os_zalloc(key_data_len); 1377 if (buf == NULL) { 1378 os_free(hdr); 1379 return; 1380 } 1381 pos = buf; 1382 os_memcpy(pos, kde, kde_len); 1383 pos += kde_len; 1384 1385 if (pad_len) 1386 *pos++ = 0xdd; 1387 1388 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", 1389 buf, key_data_len); 1390 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1391 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1392 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1393 if (aes_wrap(sm->PTK.kek, 16, 1394 (key_data_len - 8) / 8, buf, 1395 (u8 *) (key + 1))) { 1396 os_free(hdr); 1397 os_free(buf); 1398 return; 1399 } 1400 WPA_PUT_BE16(key->key_data_length, key_data_len); 1401 } else { 1402 u8 ek[32]; 1403 os_memcpy(key->key_iv, 1404 sm->group->Counter + WPA_NONCE_LEN - 16, 16); 1405 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); 1406 os_memcpy(ek, key->key_iv, 16); 1407 os_memcpy(ek + 16, sm->PTK.kek, 16); 1408 os_memcpy(key + 1, buf, key_data_len); 1409 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len); 1410 WPA_PUT_BE16(key->key_data_length, key_data_len); 1411 } 1412 os_free(buf); 1413 } 1414 1415 if (key_info & WPA_KEY_INFO_MIC) { 1416 if (!sm->PTK_valid) { 1417 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 1418 "PTK not valid when sending EAPOL-Key " 1419 "frame"); 1420 os_free(hdr); 1421 return; 1422 } 1423 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len, 1424 key->key_mic); 1425 #ifdef CONFIG_TESTING_OPTIONS 1426 if (!pairwise && 1427 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 && 1428 drand48() < 1429 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { 1430 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1431 "Corrupting group EAPOL-Key Key MIC"); 1432 key->key_mic[0]++; 1433 } 1434 #endif /* CONFIG_TESTING_OPTIONS */ 1435 } 1436 1437 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, 1438 1); 1439 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, 1440 sm->pairwise_set); 1441 os_free(hdr); 1442 } 1443 1444 1445 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1446 struct wpa_state_machine *sm, int key_info, 1447 const u8 *key_rsc, const u8 *nonce, 1448 const u8 *kde, size_t kde_len, 1449 int keyidx, int encr) 1450 { 1451 int timeout_ms; 1452 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; 1453 int ctr; 1454 1455 if (sm == NULL) 1456 return; 1457 1458 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, 1459 keyidx, encr, 0); 1460 1461 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; 1462 if (ctr == 1 && wpa_auth->conf.tx_status) 1463 timeout_ms = pairwise ? eapol_key_timeout_first : 1464 eapol_key_timeout_first_group; 1465 else 1466 timeout_ms = eapol_key_timeout_subseq; 1467 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) 1468 sm->pending_1_of_4_timeout = 1; 1469 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " 1470 "counter %d)", timeout_ms, ctr); 1471 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, 1472 wpa_send_eapol_timeout, wpa_auth, sm); 1473 } 1474 1475 1476 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len) 1477 { 1478 struct ieee802_1x_hdr *hdr; 1479 struct wpa_eapol_key *key; 1480 u16 key_info; 1481 int ret = 0; 1482 u8 mic[16]; 1483 1484 if (data_len < sizeof(*hdr) + sizeof(*key)) 1485 return -1; 1486 1487 hdr = (struct ieee802_1x_hdr *) data; 1488 key = (struct wpa_eapol_key *) (hdr + 1); 1489 key_info = WPA_GET_BE16(key->key_info); 1490 os_memcpy(mic, key->key_mic, 16); 1491 os_memset(key->key_mic, 0, 16); 1492 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK, 1493 data, data_len, key->key_mic) || 1494 os_memcmp_const(mic, key->key_mic, 16) != 0) 1495 ret = -1; 1496 os_memcpy(key->key_mic, mic, 16); 1497 return ret; 1498 } 1499 1500 1501 void wpa_remove_ptk(struct wpa_state_machine *sm) 1502 { 1503 sm->PTK_valid = FALSE; 1504 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1505 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); 1506 sm->pairwise_set = FALSE; 1507 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 1508 } 1509 1510 1511 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event) 1512 { 1513 int remove_ptk = 1; 1514 1515 if (sm == NULL) 1516 return -1; 1517 1518 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1519 "event %d notification", event); 1520 1521 switch (event) { 1522 case WPA_AUTH: 1523 case WPA_ASSOC: 1524 break; 1525 case WPA_DEAUTH: 1526 case WPA_DISASSOC: 1527 sm->DeauthenticationRequest = TRUE; 1528 break; 1529 case WPA_REAUTH: 1530 case WPA_REAUTH_EAPOL: 1531 if (!sm->started) { 1532 /* 1533 * When using WPS, we may end up here if the STA 1534 * manages to re-associate without the previous STA 1535 * entry getting removed. Consequently, we need to make 1536 * sure that the WPA state machines gets initialized 1537 * properly at this point. 1538 */ 1539 wpa_printf(MSG_DEBUG, "WPA state machine had not been " 1540 "started - initialize now"); 1541 sm->started = 1; 1542 sm->Init = TRUE; 1543 if (wpa_sm_step(sm) == 1) 1544 return 1; /* should not really happen */ 1545 sm->Init = FALSE; 1546 sm->AuthenticationRequest = TRUE; 1547 break; 1548 } 1549 if (sm->GUpdateStationKeys) { 1550 /* 1551 * Reauthentication cancels the pending group key 1552 * update for this STA. 1553 */ 1554 sm->group->GKeyDoneStations--; 1555 sm->GUpdateStationKeys = FALSE; 1556 sm->PtkGroupInit = TRUE; 1557 } 1558 sm->ReAuthenticationRequest = TRUE; 1559 break; 1560 case WPA_ASSOC_FT: 1561 #ifdef CONFIG_IEEE80211R 1562 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " 1563 "after association"); 1564 wpa_ft_install_ptk(sm); 1565 1566 /* Using FT protocol, not WPA auth state machine */ 1567 sm->ft_completed = 1; 1568 return 0; 1569 #else /* CONFIG_IEEE80211R */ 1570 break; 1571 #endif /* CONFIG_IEEE80211R */ 1572 } 1573 1574 #ifdef CONFIG_IEEE80211R 1575 sm->ft_completed = 0; 1576 #endif /* CONFIG_IEEE80211R */ 1577 1578 #ifdef CONFIG_IEEE80211W 1579 if (sm->mgmt_frame_prot && event == WPA_AUTH) 1580 remove_ptk = 0; 1581 #endif /* CONFIG_IEEE80211W */ 1582 1583 if (remove_ptk) { 1584 sm->PTK_valid = FALSE; 1585 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1586 1587 if (event != WPA_REAUTH_EAPOL) 1588 wpa_remove_ptk(sm); 1589 } 1590 1591 return wpa_sm_step(sm); 1592 } 1593 1594 1595 SM_STATE(WPA_PTK, INITIALIZE) 1596 { 1597 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); 1598 if (sm->Init) { 1599 /* Init flag is not cleared here, so avoid busy 1600 * loop by claiming nothing changed. */ 1601 sm->changed = FALSE; 1602 } 1603 1604 sm->keycount = 0; 1605 if (sm->GUpdateStationKeys) 1606 sm->group->GKeyDoneStations--; 1607 sm->GUpdateStationKeys = FALSE; 1608 if (sm->wpa == WPA_VERSION_WPA) 1609 sm->PInitAKeys = FALSE; 1610 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and 1611 * Local AA > Remote AA)) */) { 1612 sm->Pair = TRUE; 1613 } 1614 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); 1615 wpa_remove_ptk(sm); 1616 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); 1617 sm->TimeoutCtr = 0; 1618 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1619 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 1620 WPA_EAPOL_authorized, 0); 1621 } 1622 } 1623 1624 1625 SM_STATE(WPA_PTK, DISCONNECT) 1626 { 1627 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); 1628 sm->Disconnect = FALSE; 1629 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 1630 } 1631 1632 1633 SM_STATE(WPA_PTK, DISCONNECTED) 1634 { 1635 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); 1636 sm->DeauthenticationRequest = FALSE; 1637 } 1638 1639 1640 SM_STATE(WPA_PTK, AUTHENTICATION) 1641 { 1642 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); 1643 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1644 sm->PTK_valid = FALSE; 1645 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, 1646 1); 1647 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); 1648 sm->AuthenticationRequest = FALSE; 1649 } 1650 1651 1652 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, 1653 struct wpa_group *group) 1654 { 1655 if (group->first_sta_seen) 1656 return; 1657 /* 1658 * System has run bit further than at the time hostapd was started 1659 * potentially very early during boot up. This provides better chances 1660 * of collecting more randomness on embedded systems. Re-initialize the 1661 * GMK and Counter here to improve their strength if there was not 1662 * enough entropy available immediately after system startup. 1663 */ 1664 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " 1665 "station"); 1666 if (random_pool_ready() != 1) { 1667 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 1668 "to proceed - reject first 4-way handshake"); 1669 group->reject_4way_hs_for_entropy = TRUE; 1670 } else { 1671 group->first_sta_seen = TRUE; 1672 group->reject_4way_hs_for_entropy = FALSE; 1673 } 1674 1675 wpa_group_init_gmk_and_counter(wpa_auth, group); 1676 wpa_gtk_update(wpa_auth, group); 1677 wpa_group_config_group_keys(wpa_auth, group); 1678 } 1679 1680 1681 SM_STATE(WPA_PTK, AUTHENTICATION2) 1682 { 1683 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); 1684 1685 wpa_group_ensure_init(sm->wpa_auth, sm->group); 1686 sm->ReAuthenticationRequest = FALSE; 1687 1688 /* 1689 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat 1690 * ambiguous. The Authenticator state machine uses a counter that is 1691 * incremented by one for each 4-way handshake. However, the security 1692 * analysis of 4-way handshake points out that unpredictable nonces 1693 * help in preventing precomputation attacks. Instead of the state 1694 * machine definition, use an unpredictable nonce value here to provide 1695 * stronger protection against potential precomputation attacks. 1696 */ 1697 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1698 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " 1699 "ANonce."); 1700 sm->Disconnect = TRUE; 1701 return; 1702 } 1703 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, 1704 WPA_NONCE_LEN); 1705 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more 1706 * logical place than INITIALIZE since AUTHENTICATION2 can be 1707 * re-entered on ReAuthenticationRequest without going through 1708 * INITIALIZE. */ 1709 sm->TimeoutCtr = 0; 1710 } 1711 1712 1713 SM_STATE(WPA_PTK, INITPMK) 1714 { 1715 u8 msk[2 * PMK_LEN]; 1716 size_t len = 2 * PMK_LEN; 1717 1718 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); 1719 #ifdef CONFIG_IEEE80211R 1720 sm->xxkey_len = 0; 1721 #endif /* CONFIG_IEEE80211R */ 1722 if (sm->pmksa) { 1723 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); 1724 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); 1725 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { 1726 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " 1727 "(len=%lu)", (unsigned long) len); 1728 os_memcpy(sm->PMK, msk, PMK_LEN); 1729 #ifdef CONFIG_IEEE80211R 1730 if (len >= 2 * PMK_LEN) { 1731 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); 1732 sm->xxkey_len = PMK_LEN; 1733 } 1734 #endif /* CONFIG_IEEE80211R */ 1735 } else { 1736 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK"); 1737 } 1738 1739 sm->req_replay_counter_used = 0; 1740 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this 1741 * will break reauthentication since EAPOL state machines may not be 1742 * get into AUTHENTICATING state that clears keyRun before WPA state 1743 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK 1744 * state and takes PMK from the previously used AAA Key. This will 1745 * eventually fail in 4-Way Handshake because Supplicant uses PMK 1746 * derived from the new AAA Key. Setting keyRun = FALSE here seems to 1747 * be good workaround for this issue. */ 1748 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); 1749 } 1750 1751 1752 SM_STATE(WPA_PTK, INITPSK) 1753 { 1754 const u8 *psk; 1755 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); 1756 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL); 1757 if (psk) { 1758 os_memcpy(sm->PMK, psk, PMK_LEN); 1759 #ifdef CONFIG_IEEE80211R 1760 os_memcpy(sm->xxkey, psk, PMK_LEN); 1761 sm->xxkey_len = PMK_LEN; 1762 #endif /* CONFIG_IEEE80211R */ 1763 } 1764 sm->req_replay_counter_used = 0; 1765 } 1766 1767 1768 SM_STATE(WPA_PTK, PTKSTART) 1769 { 1770 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; 1771 size_t pmkid_len = 0; 1772 1773 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); 1774 sm->PTKRequest = FALSE; 1775 sm->TimeoutEvt = FALSE; 1776 1777 sm->TimeoutCtr++; 1778 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1779 /* No point in sending the EAPOL-Key - we will disconnect 1780 * immediately following this. */ 1781 return; 1782 } 1783 1784 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1785 "sending 1/4 msg of 4-Way Handshake"); 1786 /* 1787 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only 1788 * one possible PSK for this STA. 1789 */ 1790 if (sm->wpa == WPA_VERSION_WPA2 && 1791 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 1792 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) { 1793 pmkid = buf; 1794 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 1795 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; 1796 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; 1797 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); 1798 if (sm->pmksa) 1799 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], 1800 sm->pmksa->pmkid, PMKID_LEN); 1801 else { 1802 /* 1803 * Calculate PMKID since no PMKSA cache entry was 1804 * available with pre-calculated PMKID. 1805 */ 1806 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, 1807 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], 1808 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1809 } 1810 } 1811 wpa_send_eapol(sm->wpa_auth, sm, 1812 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, 1813 sm->ANonce, pmkid, pmkid_len, 0, 0); 1814 } 1815 1816 1817 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk, 1818 struct wpa_ptk *ptk) 1819 { 1820 size_t ptk_len = wpa_cipher_key_len(sm->pairwise) + 32; 1821 #ifdef CONFIG_IEEE80211R 1822 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 1823 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len); 1824 #endif /* CONFIG_IEEE80211R */ 1825 1826 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", 1827 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce, 1828 (u8 *) ptk, ptk_len, 1829 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1830 1831 return 0; 1832 } 1833 1834 1835 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) 1836 { 1837 struct wpa_ptk PTK; 1838 int ok = 0; 1839 const u8 *pmk = NULL; 1840 1841 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); 1842 sm->EAPOLKeyReceived = FALSE; 1843 sm->update_snonce = FALSE; 1844 1845 /* WPA with IEEE 802.1X: use the derived PMK from EAP 1846 * WPA-PSK: iterate through possible PSKs and select the one matching 1847 * the packet */ 1848 for (;;) { 1849 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1850 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 1851 sm->p2p_dev_addr, pmk); 1852 if (pmk == NULL) 1853 break; 1854 } else 1855 pmk = sm->PMK; 1856 1857 wpa_derive_ptk(sm, pmk, &PTK); 1858 1859 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key, 1860 sm->last_rx_eapol_key_len) == 0) { 1861 ok = 1; 1862 break; 1863 } 1864 1865 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 1866 break; 1867 } 1868 1869 if (!ok) { 1870 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1871 "invalid MIC in msg 2/4 of 4-Way Handshake"); 1872 return; 1873 } 1874 1875 #ifdef CONFIG_IEEE80211R 1876 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 1877 /* 1878 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches 1879 * with the value we derived. 1880 */ 1881 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name, 1882 WPA_PMK_NAME_LEN) != 0) { 1883 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1884 "PMKR1Name mismatch in FT 4-way " 1885 "handshake"); 1886 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " 1887 "Supplicant", 1888 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); 1889 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 1890 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 1891 return; 1892 } 1893 } 1894 #endif /* CONFIG_IEEE80211R */ 1895 1896 sm->pending_1_of_4_timeout = 0; 1897 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 1898 1899 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1900 /* PSK may have changed from the previous choice, so update 1901 * state machine data based on whatever PSK was selected here. 1902 */ 1903 os_memcpy(sm->PMK, pmk, PMK_LEN); 1904 } 1905 1906 sm->MICVerified = TRUE; 1907 1908 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 1909 sm->PTK_valid = TRUE; 1910 } 1911 1912 1913 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) 1914 { 1915 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); 1916 sm->TimeoutCtr = 0; 1917 } 1918 1919 1920 #ifdef CONFIG_IEEE80211W 1921 1922 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 1923 { 1924 if (sm->mgmt_frame_prot) { 1925 size_t len; 1926 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 1927 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len; 1928 } 1929 1930 return 0; 1931 } 1932 1933 1934 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 1935 { 1936 struct wpa_igtk_kde igtk; 1937 struct wpa_group *gsm = sm->group; 1938 u8 rsc[WPA_KEY_RSC_LEN]; 1939 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 1940 1941 if (!sm->mgmt_frame_prot) 1942 return pos; 1943 1944 igtk.keyid[0] = gsm->GN_igtk; 1945 igtk.keyid[1] = 0; 1946 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || 1947 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0) 1948 os_memset(igtk.pn, 0, sizeof(igtk.pn)); 1949 else 1950 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn)); 1951 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len); 1952 if (sm->wpa_auth->conf.disable_gtk) { 1953 /* 1954 * Provide unique random IGTK to each STA to prevent use of 1955 * IGTK in the BSS. 1956 */ 1957 if (random_get_bytes(igtk.igtk, len) < 0) 1958 return pos; 1959 } 1960 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, 1961 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len, 1962 NULL, 0); 1963 1964 return pos; 1965 } 1966 1967 #else /* CONFIG_IEEE80211W */ 1968 1969 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 1970 { 1971 return 0; 1972 } 1973 1974 1975 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 1976 { 1977 return pos; 1978 } 1979 1980 #endif /* CONFIG_IEEE80211W */ 1981 1982 1983 SM_STATE(WPA_PTK, PTKINITNEGOTIATING) 1984 { 1985 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; 1986 size_t gtk_len, kde_len; 1987 struct wpa_group *gsm = sm->group; 1988 u8 *wpa_ie; 1989 int wpa_ie_len, secure, keyidx, encr = 0; 1990 1991 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); 1992 sm->TimeoutEvt = FALSE; 1993 1994 sm->TimeoutCtr++; 1995 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1996 /* No point in sending the EAPOL-Key - we will disconnect 1997 * immediately following this. */ 1998 return; 1999 } 2000 2001 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], 2002 GTK[GN], IGTK, [FTIE], [TIE * 2]) 2003 */ 2004 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2005 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2006 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ 2007 wpa_ie = sm->wpa_auth->wpa_ie; 2008 wpa_ie_len = sm->wpa_auth->wpa_ie_len; 2009 if (sm->wpa == WPA_VERSION_WPA && 2010 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && 2011 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { 2012 /* WPA-only STA, remove RSN IE */ 2013 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2014 wpa_ie_len = wpa_ie[1] + 2; 2015 } 2016 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2017 "sending 3/4 msg of 4-Way Handshake"); 2018 if (sm->wpa == WPA_VERSION_WPA2) { 2019 /* WPA2 send GTK in the 4-way handshake */ 2020 secure = 1; 2021 gtk = gsm->GTK[gsm->GN - 1]; 2022 gtk_len = gsm->GTK_len; 2023 if (sm->wpa_auth->conf.disable_gtk) { 2024 /* 2025 * Provide unique random GTK to each STA to prevent use 2026 * of GTK in the BSS. 2027 */ 2028 if (random_get_bytes(dummy_gtk, gtk_len) < 0) 2029 return; 2030 gtk = dummy_gtk; 2031 } 2032 keyidx = gsm->GN; 2033 _rsc = rsc; 2034 encr = 1; 2035 } else { 2036 /* WPA does not include GTK in msg 3/4 */ 2037 secure = 0; 2038 gtk = NULL; 2039 gtk_len = 0; 2040 keyidx = 0; 2041 _rsc = NULL; 2042 if (sm->rx_eapol_key_secure) { 2043 /* 2044 * It looks like Windows 7 supplicant tries to use 2045 * Secure bit in msg 2/4 after having reported Michael 2046 * MIC failure and it then rejects the 4-way handshake 2047 * if msg 3/4 does not set Secure bit. Work around this 2048 * by setting the Secure bit here even in the case of 2049 * WPA if the supplicant used it first. 2050 */ 2051 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2052 "STA used Secure bit in WPA msg 2/4 - " 2053 "set Secure for 3/4 as workaround"); 2054 secure = 1; 2055 } 2056 } 2057 2058 kde_len = wpa_ie_len + ieee80211w_kde_len(sm); 2059 if (gtk) 2060 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; 2061 #ifdef CONFIG_IEEE80211R 2062 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2063 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ 2064 kde_len += 300; /* FTIE + 2 * TIE */ 2065 } 2066 #endif /* CONFIG_IEEE80211R */ 2067 #ifdef CONFIG_P2P 2068 if (WPA_GET_BE32(sm->ip_addr) > 0) 2069 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4; 2070 #endif /* CONFIG_P2P */ 2071 kde = os_malloc(kde_len); 2072 if (kde == NULL) 2073 return; 2074 2075 pos = kde; 2076 os_memcpy(pos, wpa_ie, wpa_ie_len); 2077 pos += wpa_ie_len; 2078 #ifdef CONFIG_IEEE80211R 2079 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2080 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); 2081 if (res < 0) { 2082 wpa_printf(MSG_ERROR, "FT: Failed to insert " 2083 "PMKR1Name into RSN IE in EAPOL-Key data"); 2084 os_free(kde); 2085 return; 2086 } 2087 pos += res; 2088 } 2089 #endif /* CONFIG_IEEE80211R */ 2090 if (gtk) { 2091 u8 hdr[2]; 2092 hdr[0] = keyidx & 0x03; 2093 hdr[1] = 0; 2094 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2095 gtk, gtk_len); 2096 } 2097 pos = ieee80211w_kde_add(sm, pos); 2098 2099 #ifdef CONFIG_IEEE80211R 2100 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2101 int res; 2102 struct wpa_auth_config *conf; 2103 2104 conf = &sm->wpa_auth->conf; 2105 res = wpa_write_ftie(conf, conf->r0_key_holder, 2106 conf->r0_key_holder_len, 2107 NULL, NULL, pos, kde + kde_len - pos, 2108 NULL, 0); 2109 if (res < 0) { 2110 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " 2111 "into EAPOL-Key Key Data"); 2112 os_free(kde); 2113 return; 2114 } 2115 pos += res; 2116 2117 /* TIE[ReassociationDeadline] (TU) */ 2118 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2119 *pos++ = 5; 2120 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; 2121 WPA_PUT_LE32(pos, conf->reassociation_deadline); 2122 pos += 4; 2123 2124 /* TIE[KeyLifetime] (seconds) */ 2125 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2126 *pos++ = 5; 2127 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; 2128 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); 2129 pos += 4; 2130 } 2131 #endif /* CONFIG_IEEE80211R */ 2132 #ifdef CONFIG_P2P 2133 if (WPA_GET_BE32(sm->ip_addr) > 0) { 2134 u8 addr[3 * 4]; 2135 os_memcpy(addr, sm->ip_addr, 4); 2136 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4); 2137 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4); 2138 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC, 2139 addr, sizeof(addr), NULL, 0); 2140 } 2141 #endif /* CONFIG_P2P */ 2142 2143 wpa_send_eapol(sm->wpa_auth, sm, 2144 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | 2145 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | 2146 WPA_KEY_INFO_KEY_TYPE, 2147 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); 2148 os_free(kde); 2149 } 2150 2151 2152 SM_STATE(WPA_PTK, PTKINITDONE) 2153 { 2154 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); 2155 sm->EAPOLKeyReceived = FALSE; 2156 if (sm->Pair) { 2157 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); 2158 int klen = wpa_cipher_key_len(sm->pairwise); 2159 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 2160 sm->PTK.tk1, klen)) { 2161 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 2162 return; 2163 } 2164 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 2165 sm->pairwise_set = TRUE; 2166 2167 if (sm->wpa_auth->conf.wpa_ptk_rekey) { 2168 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 2169 eloop_register_timeout(sm->wpa_auth->conf. 2170 wpa_ptk_rekey, 0, wpa_rekey_ptk, 2171 sm->wpa_auth, sm); 2172 } 2173 2174 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2175 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2176 WPA_EAPOL_authorized, 1); 2177 } 2178 } 2179 2180 if (0 /* IBSS == TRUE */) { 2181 sm->keycount++; 2182 if (sm->keycount == 2) { 2183 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2184 WPA_EAPOL_portValid, 1); 2185 } 2186 } else { 2187 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 2188 1); 2189 } 2190 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); 2191 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); 2192 if (sm->wpa == WPA_VERSION_WPA) 2193 sm->PInitAKeys = TRUE; 2194 else 2195 sm->has_GTK = TRUE; 2196 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2197 "pairwise key handshake completed (%s)", 2198 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2199 2200 #ifdef CONFIG_IEEE80211R 2201 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); 2202 #endif /* CONFIG_IEEE80211R */ 2203 } 2204 2205 2206 SM_STEP(WPA_PTK) 2207 { 2208 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 2209 2210 if (sm->Init) 2211 SM_ENTER(WPA_PTK, INITIALIZE); 2212 else if (sm->Disconnect 2213 /* || FIX: dot11RSNAConfigSALifetime timeout */) { 2214 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 2215 "WPA_PTK: sm->Disconnect"); 2216 SM_ENTER(WPA_PTK, DISCONNECT); 2217 } 2218 else if (sm->DeauthenticationRequest) 2219 SM_ENTER(WPA_PTK, DISCONNECTED); 2220 else if (sm->AuthenticationRequest) 2221 SM_ENTER(WPA_PTK, AUTHENTICATION); 2222 else if (sm->ReAuthenticationRequest) 2223 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2224 else if (sm->PTKRequest) 2225 SM_ENTER(WPA_PTK, PTKSTART); 2226 else switch (sm->wpa_ptk_state) { 2227 case WPA_PTK_INITIALIZE: 2228 break; 2229 case WPA_PTK_DISCONNECT: 2230 SM_ENTER(WPA_PTK, DISCONNECTED); 2231 break; 2232 case WPA_PTK_DISCONNECTED: 2233 SM_ENTER(WPA_PTK, INITIALIZE); 2234 break; 2235 case WPA_PTK_AUTHENTICATION: 2236 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2237 break; 2238 case WPA_PTK_AUTHENTICATION2: 2239 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 2240 wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2241 WPA_EAPOL_keyRun) > 0) 2242 SM_ENTER(WPA_PTK, INITPMK); 2243 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) 2244 /* FIX: && 802.1X::keyRun */) 2245 SM_ENTER(WPA_PTK, INITPSK); 2246 break; 2247 case WPA_PTK_INITPMK: 2248 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2249 WPA_EAPOL_keyAvailable) > 0) 2250 SM_ENTER(WPA_PTK, PTKSTART); 2251 else { 2252 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2253 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2254 "INITPMK - keyAvailable = false"); 2255 SM_ENTER(WPA_PTK, DISCONNECT); 2256 } 2257 break; 2258 case WPA_PTK_INITPSK: 2259 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, 2260 NULL)) 2261 SM_ENTER(WPA_PTK, PTKSTART); 2262 else { 2263 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2264 "no PSK configured for the STA"); 2265 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2266 SM_ENTER(WPA_PTK, DISCONNECT); 2267 } 2268 break; 2269 case WPA_PTK_PTKSTART: 2270 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2271 sm->EAPOLKeyPairwise) 2272 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2273 else if (sm->TimeoutCtr > 2274 (int) dot11RSNAConfigPairwiseUpdateCount) { 2275 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2276 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2277 "PTKSTART: Retry limit %d reached", 2278 dot11RSNAConfigPairwiseUpdateCount); 2279 SM_ENTER(WPA_PTK, DISCONNECT); 2280 } else if (sm->TimeoutEvt) 2281 SM_ENTER(WPA_PTK, PTKSTART); 2282 break; 2283 case WPA_PTK_PTKCALCNEGOTIATING: 2284 if (sm->MICVerified) 2285 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); 2286 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2287 sm->EAPOLKeyPairwise) 2288 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2289 else if (sm->TimeoutEvt) 2290 SM_ENTER(WPA_PTK, PTKSTART); 2291 break; 2292 case WPA_PTK_PTKCALCNEGOTIATING2: 2293 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2294 break; 2295 case WPA_PTK_PTKINITNEGOTIATING: 2296 if (sm->update_snonce) 2297 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2298 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2299 sm->EAPOLKeyPairwise && sm->MICVerified) 2300 SM_ENTER(WPA_PTK, PTKINITDONE); 2301 else if (sm->TimeoutCtr > 2302 (int) dot11RSNAConfigPairwiseUpdateCount) { 2303 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2304 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2305 "PTKINITNEGOTIATING: Retry limit %d " 2306 "reached", 2307 dot11RSNAConfigPairwiseUpdateCount); 2308 SM_ENTER(WPA_PTK, DISCONNECT); 2309 } else if (sm->TimeoutEvt) 2310 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2311 break; 2312 case WPA_PTK_PTKINITDONE: 2313 break; 2314 } 2315 } 2316 2317 2318 SM_STATE(WPA_PTK_GROUP, IDLE) 2319 { 2320 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); 2321 if (sm->Init) { 2322 /* Init flag is not cleared here, so avoid busy 2323 * loop by claiming nothing changed. */ 2324 sm->changed = FALSE; 2325 } 2326 sm->GTimeoutCtr = 0; 2327 } 2328 2329 2330 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) 2331 { 2332 u8 rsc[WPA_KEY_RSC_LEN]; 2333 struct wpa_group *gsm = sm->group; 2334 u8 *kde, *pos, hdr[2]; 2335 size_t kde_len; 2336 u8 *gtk, dummy_gtk[32]; 2337 2338 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); 2339 2340 sm->GTimeoutCtr++; 2341 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { 2342 /* No point in sending the EAPOL-Key - we will disconnect 2343 * immediately following this. */ 2344 return; 2345 } 2346 2347 if (sm->wpa == WPA_VERSION_WPA) 2348 sm->PInitAKeys = FALSE; 2349 sm->TimeoutEvt = FALSE; 2350 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ 2351 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2352 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) 2353 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2354 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2355 "sending 1/2 msg of Group Key Handshake"); 2356 2357 gtk = gsm->GTK[gsm->GN - 1]; 2358 if (sm->wpa_auth->conf.disable_gtk) { 2359 /* 2360 * Provide unique random GTK to each STA to prevent use 2361 * of GTK in the BSS. 2362 */ 2363 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) 2364 return; 2365 gtk = dummy_gtk; 2366 } 2367 if (sm->wpa == WPA_VERSION_WPA2) { 2368 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + 2369 ieee80211w_kde_len(sm); 2370 kde = os_malloc(kde_len); 2371 if (kde == NULL) 2372 return; 2373 2374 pos = kde; 2375 hdr[0] = gsm->GN & 0x03; 2376 hdr[1] = 0; 2377 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2378 gtk, gsm->GTK_len); 2379 pos = ieee80211w_kde_add(sm, pos); 2380 } else { 2381 kde = gtk; 2382 pos = kde + gsm->GTK_len; 2383 } 2384 2385 wpa_send_eapol(sm->wpa_auth, sm, 2386 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | 2387 WPA_KEY_INFO_ACK | 2388 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), 2389 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1); 2390 if (sm->wpa == WPA_VERSION_WPA2) 2391 os_free(kde); 2392 } 2393 2394 2395 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) 2396 { 2397 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); 2398 sm->EAPOLKeyReceived = FALSE; 2399 if (sm->GUpdateStationKeys) 2400 sm->group->GKeyDoneStations--; 2401 sm->GUpdateStationKeys = FALSE; 2402 sm->GTimeoutCtr = 0; 2403 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ 2404 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2405 "group key handshake completed (%s)", 2406 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2407 sm->has_GTK = TRUE; 2408 } 2409 2410 2411 SM_STATE(WPA_PTK_GROUP, KEYERROR) 2412 { 2413 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); 2414 if (sm->GUpdateStationKeys) 2415 sm->group->GKeyDoneStations--; 2416 sm->GUpdateStationKeys = FALSE; 2417 sm->Disconnect = TRUE; 2418 } 2419 2420 2421 SM_STEP(WPA_PTK_GROUP) 2422 { 2423 if (sm->Init || sm->PtkGroupInit) { 2424 SM_ENTER(WPA_PTK_GROUP, IDLE); 2425 sm->PtkGroupInit = FALSE; 2426 } else switch (sm->wpa_ptk_group_state) { 2427 case WPA_PTK_GROUP_IDLE: 2428 if (sm->GUpdateStationKeys || 2429 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) 2430 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2431 break; 2432 case WPA_PTK_GROUP_REKEYNEGOTIATING: 2433 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2434 !sm->EAPOLKeyPairwise && sm->MICVerified) 2435 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); 2436 else if (sm->GTimeoutCtr > 2437 (int) dot11RSNAConfigGroupUpdateCount) 2438 SM_ENTER(WPA_PTK_GROUP, KEYERROR); 2439 else if (sm->TimeoutEvt) 2440 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2441 break; 2442 case WPA_PTK_GROUP_KEYERROR: 2443 SM_ENTER(WPA_PTK_GROUP, IDLE); 2444 break; 2445 case WPA_PTK_GROUP_REKEYESTABLISHED: 2446 SM_ENTER(WPA_PTK_GROUP, IDLE); 2447 break; 2448 } 2449 } 2450 2451 2452 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 2453 struct wpa_group *group) 2454 { 2455 int ret = 0; 2456 2457 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2458 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2459 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", 2460 wpa_auth->addr, group->GNonce, 2461 group->GTK[group->GN - 1], group->GTK_len) < 0) 2462 ret = -1; 2463 wpa_hexdump_key(MSG_DEBUG, "GTK", 2464 group->GTK[group->GN - 1], group->GTK_len); 2465 2466 #ifdef CONFIG_IEEE80211W 2467 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2468 size_t len; 2469 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2470 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2471 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2472 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", 2473 wpa_auth->addr, group->GNonce, 2474 group->IGTK[group->GN_igtk - 4], len) < 0) 2475 ret = -1; 2476 wpa_hexdump_key(MSG_DEBUG, "IGTK", 2477 group->IGTK[group->GN_igtk - 4], len); 2478 } 2479 #endif /* CONFIG_IEEE80211W */ 2480 2481 return ret; 2482 } 2483 2484 2485 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, 2486 struct wpa_group *group) 2487 { 2488 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2489 "GTK_INIT (VLAN-ID %d)", group->vlan_id); 2490 group->changed = FALSE; /* GInit is not cleared here; avoid loop */ 2491 group->wpa_group_state = WPA_GROUP_GTK_INIT; 2492 2493 /* GTK[0..N] = 0 */ 2494 os_memset(group->GTK, 0, sizeof(group->GTK)); 2495 group->GN = 1; 2496 group->GM = 2; 2497 #ifdef CONFIG_IEEE80211W 2498 group->GN_igtk = 4; 2499 group->GM_igtk = 5; 2500 #endif /* CONFIG_IEEE80211W */ 2501 /* GTK[GN] = CalcGTK() */ 2502 wpa_gtk_update(wpa_auth, group); 2503 } 2504 2505 2506 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) 2507 { 2508 if (ctx != NULL && ctx != sm->group) 2509 return 0; 2510 2511 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { 2512 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2513 "Not in PTKINITDONE; skip Group Key update"); 2514 sm->GUpdateStationKeys = FALSE; 2515 return 0; 2516 } 2517 if (sm->GUpdateStationKeys) { 2518 /* 2519 * This should not really happen, so add a debug log entry. 2520 * Since we clear the GKeyDoneStations before the loop, the 2521 * station needs to be counted here anyway. 2522 */ 2523 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2524 "GUpdateStationKeys was already set when " 2525 "marking station for GTK rekeying"); 2526 } 2527 2528 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ 2529 if (sm->is_wnmsleep) 2530 return 0; 2531 2532 sm->group->GKeyDoneStations++; 2533 sm->GUpdateStationKeys = TRUE; 2534 2535 wpa_sm_step(sm); 2536 return 0; 2537 } 2538 2539 2540 #ifdef CONFIG_WNM 2541 /* update GTK when exiting WNM-Sleep Mode */ 2542 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) 2543 { 2544 if (sm == NULL || sm->is_wnmsleep) 2545 return; 2546 2547 wpa_group_update_sta(sm, NULL); 2548 } 2549 2550 2551 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) 2552 { 2553 if (sm) 2554 sm->is_wnmsleep = !!flag; 2555 } 2556 2557 2558 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2559 { 2560 struct wpa_group *gsm = sm->group; 2561 u8 *start = pos; 2562 2563 /* 2564 * GTK subelement: 2565 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 2566 * Key[5..32] 2567 */ 2568 *pos++ = WNM_SLEEP_SUBELEM_GTK; 2569 *pos++ = 11 + gsm->GTK_len; 2570 /* Key ID in B0-B1 of Key Info */ 2571 WPA_PUT_LE16(pos, gsm->GN & 0x03); 2572 pos += 2; 2573 *pos++ = gsm->GTK_len; 2574 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) 2575 return 0; 2576 pos += 8; 2577 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2578 pos += gsm->GTK_len; 2579 2580 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", 2581 gsm->GN); 2582 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", 2583 gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2584 2585 return pos - start; 2586 } 2587 2588 2589 #ifdef CONFIG_IEEE80211W 2590 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2591 { 2592 struct wpa_group *gsm = sm->group; 2593 u8 *start = pos; 2594 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2595 2596 /* 2597 * IGTK subelement: 2598 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] 2599 */ 2600 *pos++ = WNM_SLEEP_SUBELEM_IGTK; 2601 *pos++ = 2 + 6 + len; 2602 WPA_PUT_LE16(pos, gsm->GN_igtk); 2603 pos += 2; 2604 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) 2605 return 0; 2606 pos += 6; 2607 2608 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len); 2609 pos += len; 2610 2611 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", 2612 gsm->GN_igtk); 2613 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", 2614 gsm->IGTK[gsm->GN_igtk - 4], len); 2615 2616 return pos - start; 2617 } 2618 #endif /* CONFIG_IEEE80211W */ 2619 #endif /* CONFIG_WNM */ 2620 2621 2622 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, 2623 struct wpa_group *group) 2624 { 2625 int tmp; 2626 2627 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2628 "SETKEYS (VLAN-ID %d)", group->vlan_id); 2629 group->changed = TRUE; 2630 group->wpa_group_state = WPA_GROUP_SETKEYS; 2631 group->GTKReKey = FALSE; 2632 tmp = group->GM; 2633 group->GM = group->GN; 2634 group->GN = tmp; 2635 #ifdef CONFIG_IEEE80211W 2636 tmp = group->GM_igtk; 2637 group->GM_igtk = group->GN_igtk; 2638 group->GN_igtk = tmp; 2639 #endif /* CONFIG_IEEE80211W */ 2640 /* "GKeyDoneStations = GNoStations" is done in more robust way by 2641 * counting the STAs that are marked with GUpdateStationKeys instead of 2642 * including all STAs that could be in not-yet-completed state. */ 2643 wpa_gtk_update(wpa_auth, group); 2644 2645 if (group->GKeyDoneStations) { 2646 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " 2647 "GKeyDoneStations=%d when starting new GTK rekey", 2648 group->GKeyDoneStations); 2649 group->GKeyDoneStations = 0; 2650 } 2651 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); 2652 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", 2653 group->GKeyDoneStations); 2654 } 2655 2656 2657 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 2658 struct wpa_group *group) 2659 { 2660 int ret = 0; 2661 2662 if (wpa_auth_set_key(wpa_auth, group->vlan_id, 2663 wpa_cipher_to_alg(wpa_auth->conf.wpa_group), 2664 broadcast_ether_addr, group->GN, 2665 group->GTK[group->GN - 1], group->GTK_len) < 0) 2666 ret = -1; 2667 2668 #ifdef CONFIG_IEEE80211W 2669 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2670 enum wpa_alg alg; 2671 size_t len; 2672 2673 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher); 2674 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2675 2676 if (ret == 0 && 2677 wpa_auth_set_key(wpa_auth, group->vlan_id, alg, 2678 broadcast_ether_addr, group->GN_igtk, 2679 group->IGTK[group->GN_igtk - 4], len) < 0) 2680 ret = -1; 2681 } 2682 #endif /* CONFIG_IEEE80211W */ 2683 2684 return ret; 2685 } 2686 2687 2688 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx) 2689 { 2690 if (sm->group == ctx) { 2691 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR 2692 " for discconnection due to fatal failure", 2693 MAC2STR(sm->addr)); 2694 sm->Disconnect = TRUE; 2695 } 2696 2697 return 0; 2698 } 2699 2700 2701 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth, 2702 struct wpa_group *group) 2703 { 2704 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE"); 2705 group->changed = TRUE; 2706 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE; 2707 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group); 2708 } 2709 2710 2711 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, 2712 struct wpa_group *group) 2713 { 2714 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2715 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); 2716 group->changed = TRUE; 2717 group->wpa_group_state = WPA_GROUP_SETKEYSDONE; 2718 2719 if (wpa_group_config_group_keys(wpa_auth, group) < 0) { 2720 wpa_group_fatal_failure(wpa_auth, group); 2721 return -1; 2722 } 2723 2724 return 0; 2725 } 2726 2727 2728 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 2729 struct wpa_group *group) 2730 { 2731 if (group->GInit) { 2732 wpa_group_gtk_init(wpa_auth, group); 2733 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) { 2734 /* Do not allow group operations */ 2735 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && 2736 group->GTKAuthenticator) { 2737 wpa_group_setkeysdone(wpa_auth, group); 2738 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && 2739 group->GTKReKey) { 2740 wpa_group_setkeys(wpa_auth, group); 2741 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { 2742 if (group->GKeyDoneStations == 0) 2743 wpa_group_setkeysdone(wpa_auth, group); 2744 else if (group->GTKReKey) 2745 wpa_group_setkeys(wpa_auth, group); 2746 } 2747 } 2748 2749 2750 static int wpa_sm_step(struct wpa_state_machine *sm) 2751 { 2752 if (sm == NULL) 2753 return 0; 2754 2755 if (sm->in_step_loop) { 2756 /* This should not happen, but if it does, make sure we do not 2757 * end up freeing the state machine too early by exiting the 2758 * recursive call. */ 2759 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); 2760 return 0; 2761 } 2762 2763 sm->in_step_loop = 1; 2764 do { 2765 if (sm->pending_deinit) 2766 break; 2767 2768 sm->changed = FALSE; 2769 sm->wpa_auth->group->changed = FALSE; 2770 2771 SM_STEP_RUN(WPA_PTK); 2772 if (sm->pending_deinit) 2773 break; 2774 SM_STEP_RUN(WPA_PTK_GROUP); 2775 if (sm->pending_deinit) 2776 break; 2777 wpa_group_sm_step(sm->wpa_auth, sm->group); 2778 } while (sm->changed || sm->wpa_auth->group->changed); 2779 sm->in_step_loop = 0; 2780 2781 if (sm->pending_deinit) { 2782 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " 2783 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 2784 wpa_free_sta_sm(sm); 2785 return 1; 2786 } 2787 return 0; 2788 } 2789 2790 2791 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) 2792 { 2793 struct wpa_state_machine *sm = eloop_ctx; 2794 wpa_sm_step(sm); 2795 } 2796 2797 2798 void wpa_auth_sm_notify(struct wpa_state_machine *sm) 2799 { 2800 if (sm == NULL) 2801 return; 2802 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); 2803 } 2804 2805 2806 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) 2807 { 2808 int tmp, i; 2809 struct wpa_group *group; 2810 2811 if (wpa_auth == NULL) 2812 return; 2813 2814 group = wpa_auth->group; 2815 2816 for (i = 0; i < 2; i++) { 2817 tmp = group->GM; 2818 group->GM = group->GN; 2819 group->GN = tmp; 2820 #ifdef CONFIG_IEEE80211W 2821 tmp = group->GM_igtk; 2822 group->GM_igtk = group->GN_igtk; 2823 group->GN_igtk = tmp; 2824 #endif /* CONFIG_IEEE80211W */ 2825 wpa_gtk_update(wpa_auth, group); 2826 wpa_group_config_group_keys(wpa_auth, group); 2827 } 2828 } 2829 2830 2831 static const char * wpa_bool_txt(int bool) 2832 { 2833 return bool ? "TRUE" : "FALSE"; 2834 } 2835 2836 2837 #define RSN_SUITE "%02x-%02x-%02x-%d" 2838 #define RSN_SUITE_ARG(s) \ 2839 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 2840 2841 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) 2842 { 2843 int len = 0, ret; 2844 char pmkid_txt[PMKID_LEN * 2 + 1]; 2845 #ifdef CONFIG_RSN_PREAUTH 2846 const int preauth = 1; 2847 #else /* CONFIG_RSN_PREAUTH */ 2848 const int preauth = 0; 2849 #endif /* CONFIG_RSN_PREAUTH */ 2850 2851 if (wpa_auth == NULL) 2852 return len; 2853 2854 ret = os_snprintf(buf + len, buflen - len, 2855 "dot11RSNAOptionImplemented=TRUE\n" 2856 "dot11RSNAPreauthenticationImplemented=%s\n" 2857 "dot11RSNAEnabled=%s\n" 2858 "dot11RSNAPreauthenticationEnabled=%s\n", 2859 wpa_bool_txt(preauth), 2860 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), 2861 wpa_bool_txt(wpa_auth->conf.rsn_preauth)); 2862 if (ret < 0 || (size_t) ret >= buflen - len) 2863 return len; 2864 len += ret; 2865 2866 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 2867 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); 2868 2869 ret = os_snprintf( 2870 buf + len, buflen - len, 2871 "dot11RSNAConfigVersion=%u\n" 2872 "dot11RSNAConfigPairwiseKeysSupported=9999\n" 2873 /* FIX: dot11RSNAConfigGroupCipher */ 2874 /* FIX: dot11RSNAConfigGroupRekeyMethod */ 2875 /* FIX: dot11RSNAConfigGroupRekeyTime */ 2876 /* FIX: dot11RSNAConfigGroupRekeyPackets */ 2877 "dot11RSNAConfigGroupRekeyStrict=%u\n" 2878 "dot11RSNAConfigGroupUpdateCount=%u\n" 2879 "dot11RSNAConfigPairwiseUpdateCount=%u\n" 2880 "dot11RSNAConfigGroupCipherSize=%u\n" 2881 "dot11RSNAConfigPMKLifetime=%u\n" 2882 "dot11RSNAConfigPMKReauthThreshold=%u\n" 2883 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" 2884 "dot11RSNAConfigSATimeout=%u\n" 2885 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 2886 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 2887 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 2888 "dot11RSNAPMKIDUsed=%s\n" 2889 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 2890 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 2891 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 2892 "dot11RSNATKIPCounterMeasuresInvoked=%u\n" 2893 "dot11RSNA4WayHandshakeFailures=%u\n" 2894 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", 2895 RSN_VERSION, 2896 !!wpa_auth->conf.wpa_strict_rekey, 2897 dot11RSNAConfigGroupUpdateCount, 2898 dot11RSNAConfigPairwiseUpdateCount, 2899 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, 2900 dot11RSNAConfigPMKLifetime, 2901 dot11RSNAConfigPMKReauthThreshold, 2902 dot11RSNAConfigSATimeout, 2903 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), 2904 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), 2905 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), 2906 pmkid_txt, 2907 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), 2908 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), 2909 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), 2910 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, 2911 wpa_auth->dot11RSNA4WayHandshakeFailures); 2912 if (ret < 0 || (size_t) ret >= buflen - len) 2913 return len; 2914 len += ret; 2915 2916 /* TODO: dot11RSNAConfigPairwiseCiphersTable */ 2917 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ 2918 2919 /* Private MIB */ 2920 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", 2921 wpa_auth->group->wpa_group_state); 2922 if (ret < 0 || (size_t) ret >= buflen - len) 2923 return len; 2924 len += ret; 2925 2926 return len; 2927 } 2928 2929 2930 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) 2931 { 2932 int len = 0, ret; 2933 u32 pairwise = 0; 2934 2935 if (sm == NULL) 2936 return 0; 2937 2938 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ 2939 2940 /* dot11RSNAStatsEntry */ 2941 2942 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? 2943 WPA_PROTO_RSN : WPA_PROTO_WPA, 2944 sm->pairwise); 2945 if (pairwise == 0) 2946 return 0; 2947 2948 ret = os_snprintf( 2949 buf + len, buflen - len, 2950 /* TODO: dot11RSNAStatsIndex */ 2951 "dot11RSNAStatsSTAAddress=" MACSTR "\n" 2952 "dot11RSNAStatsVersion=1\n" 2953 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" 2954 /* TODO: dot11RSNAStatsTKIPICVErrors */ 2955 "dot11RSNAStatsTKIPLocalMICFailures=%u\n" 2956 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" 2957 /* TODO: dot11RSNAStatsCCMPReplays */ 2958 /* TODO: dot11RSNAStatsCCMPDecryptErrors */ 2959 /* TODO: dot11RSNAStatsTKIPReplays */, 2960 MAC2STR(sm->addr), 2961 RSN_SUITE_ARG(pairwise), 2962 sm->dot11RSNAStatsTKIPLocalMICFailures, 2963 sm->dot11RSNAStatsTKIPRemoteMICFailures); 2964 if (ret < 0 || (size_t) ret >= buflen - len) 2965 return len; 2966 len += ret; 2967 2968 /* Private MIB */ 2969 ret = os_snprintf(buf + len, buflen - len, 2970 "hostapdWPAPTKState=%d\n" 2971 "hostapdWPAPTKGroupState=%d\n", 2972 sm->wpa_ptk_state, 2973 sm->wpa_ptk_group_state); 2974 if (ret < 0 || (size_t) ret >= buflen - len) 2975 return len; 2976 len += ret; 2977 2978 return len; 2979 } 2980 2981 2982 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) 2983 { 2984 if (wpa_auth) 2985 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; 2986 } 2987 2988 2989 int wpa_auth_pairwise_set(struct wpa_state_machine *sm) 2990 { 2991 return sm && sm->pairwise_set; 2992 } 2993 2994 2995 int wpa_auth_get_pairwise(struct wpa_state_machine *sm) 2996 { 2997 return sm->pairwise; 2998 } 2999 3000 3001 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) 3002 { 3003 if (sm == NULL) 3004 return -1; 3005 return sm->wpa_key_mgmt; 3006 } 3007 3008 3009 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) 3010 { 3011 if (sm == NULL) 3012 return 0; 3013 return sm->wpa; 3014 } 3015 3016 3017 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, 3018 struct rsn_pmksa_cache_entry *entry) 3019 { 3020 if (sm == NULL || sm->pmksa != entry) 3021 return -1; 3022 sm->pmksa = NULL; 3023 return 0; 3024 } 3025 3026 3027 struct rsn_pmksa_cache_entry * 3028 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) 3029 { 3030 return sm ? sm->pmksa : NULL; 3031 } 3032 3033 3034 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) 3035 { 3036 if (sm) 3037 sm->dot11RSNAStatsTKIPLocalMICFailures++; 3038 } 3039 3040 3041 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) 3042 { 3043 if (wpa_auth == NULL) 3044 return NULL; 3045 *len = wpa_auth->wpa_ie_len; 3046 return wpa_auth->wpa_ie; 3047 } 3048 3049 3050 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, 3051 int session_timeout, struct eapol_state_machine *eapol) 3052 { 3053 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || 3054 sm->wpa_auth->conf.disable_pmksa_caching) 3055 return -1; 3056 3057 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, 3058 sm->wpa_auth->addr, sm->addr, session_timeout, 3059 eapol, sm->wpa_key_mgmt)) 3060 return 0; 3061 3062 return -1; 3063 } 3064 3065 3066 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, 3067 const u8 *pmk, size_t len, const u8 *sta_addr, 3068 int session_timeout, 3069 struct eapol_state_machine *eapol) 3070 { 3071 if (wpa_auth == NULL) 3072 return -1; 3073 3074 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr, 3075 sta_addr, session_timeout, eapol, 3076 WPA_KEY_MGMT_IEEE8021X)) 3077 return 0; 3078 3079 return -1; 3080 } 3081 3082 3083 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth, 3084 const u8 *sta_addr) 3085 { 3086 struct rsn_pmksa_cache_entry *pmksa; 3087 3088 if (wpa_auth == NULL || wpa_auth->pmksa == NULL) 3089 return; 3090 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL); 3091 if (pmksa) { 3092 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for " 3093 MACSTR " based on request", MAC2STR(sta_addr)); 3094 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa); 3095 } 3096 } 3097 3098 3099 static struct wpa_group * 3100 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) 3101 { 3102 struct wpa_group *group; 3103 3104 if (wpa_auth == NULL || wpa_auth->group == NULL) 3105 return NULL; 3106 3107 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", 3108 vlan_id); 3109 group = wpa_group_init(wpa_auth, vlan_id, 0); 3110 if (group == NULL) 3111 return NULL; 3112 3113 group->next = wpa_auth->group->next; 3114 wpa_auth->group->next = group; 3115 3116 return group; 3117 } 3118 3119 3120 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) 3121 { 3122 struct wpa_group *group; 3123 3124 if (sm == NULL || sm->wpa_auth == NULL) 3125 return 0; 3126 3127 group = sm->wpa_auth->group; 3128 while (group) { 3129 if (group->vlan_id == vlan_id) 3130 break; 3131 group = group->next; 3132 } 3133 3134 if (group == NULL) { 3135 group = wpa_auth_add_group(sm->wpa_auth, vlan_id); 3136 if (group == NULL) 3137 return -1; 3138 } 3139 3140 if (sm->group == group) 3141 return 0; 3142 3143 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 3144 return -1; 3145 3146 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " 3147 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); 3148 3149 sm->group = group; 3150 return 0; 3151 } 3152 3153 3154 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, 3155 struct wpa_state_machine *sm, int ack) 3156 { 3157 if (wpa_auth == NULL || sm == NULL) 3158 return; 3159 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR 3160 " ack=%d", MAC2STR(sm->addr), ack); 3161 if (sm->pending_1_of_4_timeout && ack) { 3162 /* 3163 * Some deployed supplicant implementations update their SNonce 3164 * for each EAPOL-Key 2/4 message even within the same 4-way 3165 * handshake and then fail to use the first SNonce when 3166 * deriving the PTK. This results in unsuccessful 4-way 3167 * handshake whenever the relatively short initial timeout is 3168 * reached and EAPOL-Key 1/4 is retransmitted. Try to work 3169 * around this by increasing the timeout now that we know that 3170 * the station has received the frame. 3171 */ 3172 int timeout_ms = eapol_key_timeout_subseq; 3173 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " 3174 "timeout by %u ms because of acknowledged frame", 3175 timeout_ms); 3176 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 3177 eloop_register_timeout(timeout_ms / 1000, 3178 (timeout_ms % 1000) * 1000, 3179 wpa_send_eapol_timeout, wpa_auth, sm); 3180 } 3181 } 3182 3183 3184 int wpa_auth_uses_sae(struct wpa_state_machine *sm) 3185 { 3186 if (sm == NULL) 3187 return 0; 3188 return wpa_key_mgmt_sae(sm->wpa_key_mgmt); 3189 } 3190 3191 3192 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm) 3193 { 3194 if (sm == NULL) 3195 return 0; 3196 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE; 3197 } 3198 3199 3200 #ifdef CONFIG_P2P 3201 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr) 3202 { 3203 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0) 3204 return -1; 3205 os_memcpy(addr, sm->ip_addr, 4); 3206 return 0; 3207 } 3208 #endif /* CONFIG_P2P */ 3209
