1 /* 2 * IEEE 802.11 RSN / WPA Authenticator 3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "utils/eloop.h" 13 #include "utils/state_machine.h" 14 #include "utils/bitfield.h" 15 #include "common/ieee802_11_defs.h" 16 #include "crypto/aes_wrap.h" 17 #include "crypto/crypto.h" 18 #include "crypto/sha1.h" 19 #include "crypto/sha256.h" 20 #include "crypto/random.h" 21 #include "eapol_auth/eapol_auth_sm.h" 22 #include "ap_config.h" 23 #include "ieee802_11.h" 24 #include "wpa_auth.h" 25 #include "pmksa_cache_auth.h" 26 #include "wpa_auth_i.h" 27 #include "wpa_auth_ie.h" 28 29 #define STATE_MACHINE_DATA struct wpa_state_machine 30 #define STATE_MACHINE_DEBUG_PREFIX "WPA" 31 #define STATE_MACHINE_ADDR sm->addr 32 33 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(int akmp, struct wpa_ptk *PTK, u8 *data, 37 size_t data_len); 38 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx); 39 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 40 struct wpa_group *group); 41 static void wpa_request_new_ptk(struct wpa_state_machine *sm); 42 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 43 struct wpa_group *group); 44 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 45 struct wpa_group *group); 46 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce, 47 const u8 *pmk, struct wpa_ptk *ptk); 48 static void wpa_group_free(struct wpa_authenticator *wpa_auth, 49 struct wpa_group *group); 50 static void wpa_group_get(struct wpa_authenticator *wpa_auth, 51 struct wpa_group *group); 52 static void wpa_group_put(struct wpa_authenticator *wpa_auth, 53 struct wpa_group *group); 54 55 static const u32 dot11RSNAConfigGroupUpdateCount = 4; 56 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4; 57 static const u32 eapol_key_timeout_first = 100; /* ms */ 58 static const u32 eapol_key_timeout_subseq = 1000; /* ms */ 59 static const u32 eapol_key_timeout_first_group = 500; /* ms */ 60 61 /* TODO: make these configurable */ 62 static const int dot11RSNAConfigPMKLifetime = 43200; 63 static const int dot11RSNAConfigPMKReauthThreshold = 70; 64 static const int dot11RSNAConfigSATimeout = 60; 65 66 67 static inline int wpa_auth_mic_failure_report( 68 struct wpa_authenticator *wpa_auth, const u8 *addr) 69 { 70 if (wpa_auth->cb.mic_failure_report) 71 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr); 72 return 0; 73 } 74 75 76 static inline void wpa_auth_psk_failure_report( 77 struct wpa_authenticator *wpa_auth, const u8 *addr) 78 { 79 if (wpa_auth->cb.psk_failure_report) 80 wpa_auth->cb.psk_failure_report(wpa_auth->cb.ctx, addr); 81 } 82 83 84 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth, 85 const u8 *addr, wpa_eapol_variable var, 86 int value) 87 { 88 if (wpa_auth->cb.set_eapol) 89 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value); 90 } 91 92 93 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth, 94 const u8 *addr, wpa_eapol_variable var) 95 { 96 if (wpa_auth->cb.get_eapol == NULL) 97 return -1; 98 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var); 99 } 100 101 102 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth, 103 const u8 *addr, 104 const u8 *p2p_dev_addr, 105 const u8 *prev_psk) 106 { 107 if (wpa_auth->cb.get_psk == NULL) 108 return NULL; 109 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr, 110 prev_psk); 111 } 112 113 114 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth, 115 const u8 *addr, u8 *msk, size_t *len) 116 { 117 if (wpa_auth->cb.get_msk == NULL) 118 return -1; 119 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len); 120 } 121 122 123 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 124 int vlan_id, 125 enum wpa_alg alg, const u8 *addr, int idx, 126 u8 *key, size_t key_len) 127 { 128 if (wpa_auth->cb.set_key == NULL) 129 return -1; 130 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 131 key, key_len); 132 } 133 134 135 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 136 const u8 *addr, int idx, u8 *seq) 137 { 138 if (wpa_auth->cb.get_seqnum == NULL) 139 return -1; 140 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 141 } 142 143 144 static inline int 145 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr, 146 const u8 *data, size_t data_len, int encrypt) 147 { 148 if (wpa_auth->cb.send_eapol == NULL) 149 return -1; 150 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len, 151 encrypt); 152 } 153 154 155 #ifdef CONFIG_MESH 156 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth, 157 const u8 *addr) 158 { 159 if (wpa_auth->cb.start_ampe == NULL) 160 return -1; 161 return wpa_auth->cb.start_ampe(wpa_auth->cb.ctx, addr); 162 } 163 #endif /* CONFIG_MESH */ 164 165 166 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth, 167 int (*cb)(struct wpa_state_machine *sm, void *ctx), 168 void *cb_ctx) 169 { 170 if (wpa_auth->cb.for_each_sta == NULL) 171 return 0; 172 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx); 173 } 174 175 176 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth, 177 int (*cb)(struct wpa_authenticator *a, void *ctx), 178 void *cb_ctx) 179 { 180 if (wpa_auth->cb.for_each_auth == NULL) 181 return 0; 182 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx); 183 } 184 185 186 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr, 187 logger_level level, const char *txt) 188 { 189 if (wpa_auth->cb.logger == NULL) 190 return; 191 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt); 192 } 193 194 195 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr, 196 logger_level level, const char *fmt, ...) 197 { 198 char *format; 199 int maxlen; 200 va_list ap; 201 202 if (wpa_auth->cb.logger == NULL) 203 return; 204 205 maxlen = os_strlen(fmt) + 100; 206 format = os_malloc(maxlen); 207 if (!format) 208 return; 209 210 va_start(ap, fmt); 211 vsnprintf(format, maxlen, fmt, ap); 212 va_end(ap); 213 214 wpa_auth_logger(wpa_auth, addr, level, format); 215 216 os_free(format); 217 } 218 219 220 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth, 221 const u8 *addr) 222 { 223 if (wpa_auth->cb.disconnect == NULL) 224 return; 225 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr)); 226 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr, 227 WLAN_REASON_PREV_AUTH_NOT_VALID); 228 } 229 230 231 static int wpa_use_aes_cmac(struct wpa_state_machine *sm) 232 { 233 int ret = 0; 234 #ifdef CONFIG_IEEE80211R 235 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 236 ret = 1; 237 #endif /* CONFIG_IEEE80211R */ 238 #ifdef CONFIG_IEEE80211W 239 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt)) 240 ret = 1; 241 #endif /* CONFIG_IEEE80211W */ 242 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) 243 ret = 1; 244 return ret; 245 } 246 247 248 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx) 249 { 250 struct wpa_authenticator *wpa_auth = eloop_ctx; 251 252 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) { 253 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 254 "initialization."); 255 } else { 256 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd"); 257 wpa_hexdump_key(MSG_DEBUG, "GMK", 258 wpa_auth->group->GMK, WPA_GMK_LEN); 259 } 260 261 if (wpa_auth->conf.wpa_gmk_rekey) { 262 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 263 wpa_rekey_gmk, wpa_auth, NULL); 264 } 265 } 266 267 268 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx) 269 { 270 struct wpa_authenticator *wpa_auth = eloop_ctx; 271 struct wpa_group *group, *next; 272 273 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK"); 274 group = wpa_auth->group; 275 while (group) { 276 wpa_group_get(wpa_auth, group); 277 278 group->GTKReKey = TRUE; 279 do { 280 group->changed = FALSE; 281 wpa_group_sm_step(wpa_auth, group); 282 } while (group->changed); 283 284 next = group->next; 285 wpa_group_put(wpa_auth, group); 286 group = next; 287 } 288 289 if (wpa_auth->conf.wpa_group_rekey) { 290 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 291 0, wpa_rekey_gtk, wpa_auth, NULL); 292 } 293 } 294 295 296 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 297 { 298 struct wpa_authenticator *wpa_auth = eloop_ctx; 299 struct wpa_state_machine *sm = timeout_ctx; 300 301 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK"); 302 wpa_request_new_ptk(sm); 303 wpa_sm_step(sm); 304 } 305 306 307 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx) 308 { 309 if (sm->pmksa == ctx) 310 sm->pmksa = NULL; 311 return 0; 312 } 313 314 315 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 316 void *ctx) 317 { 318 struct wpa_authenticator *wpa_auth = ctx; 319 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry); 320 } 321 322 323 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth, 324 struct wpa_group *group) 325 { 326 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)]; 327 u8 rkey[32]; 328 unsigned long ptr; 329 330 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0) 331 return -1; 332 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN); 333 334 /* 335 * Counter = PRF-256(Random number, "Init Counter", 336 * Local MAC Address || Time) 337 */ 338 os_memcpy(buf, wpa_auth->addr, ETH_ALEN); 339 wpa_get_ntp_timestamp(buf + ETH_ALEN); 340 ptr = (unsigned long) group; 341 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr)); 342 if (random_get_bytes(rkey, sizeof(rkey)) < 0) 343 return -1; 344 345 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf), 346 group->Counter, WPA_NONCE_LEN) < 0) 347 return -1; 348 wpa_hexdump_key(MSG_DEBUG, "Key Counter", 349 group->Counter, WPA_NONCE_LEN); 350 351 return 0; 352 } 353 354 355 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth, 356 int vlan_id, int delay_init) 357 { 358 struct wpa_group *group; 359 360 group = os_zalloc(sizeof(struct wpa_group)); 361 if (group == NULL) 362 return NULL; 363 364 group->GTKAuthenticator = TRUE; 365 group->vlan_id = vlan_id; 366 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 367 368 if (random_pool_ready() != 1) { 369 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 370 "for secure operations - update keys later when " 371 "the first station connects"); 372 } 373 374 /* 375 * Set initial GMK/Counter value here. The actual values that will be 376 * used in negotiations will be set once the first station tries to 377 * connect. This allows more time for collecting additional randomness 378 * on embedded devices. 379 */ 380 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) { 381 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 382 "initialization."); 383 os_free(group); 384 return NULL; 385 } 386 387 group->GInit = TRUE; 388 if (delay_init) { 389 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start " 390 "until Beacon frames have been configured"); 391 /* Initialization is completed in wpa_init_keys(). */ 392 } else { 393 wpa_group_sm_step(wpa_auth, group); 394 group->GInit = FALSE; 395 wpa_group_sm_step(wpa_auth, group); 396 } 397 398 return group; 399 } 400 401 402 /** 403 * wpa_init - Initialize WPA authenticator 404 * @addr: Authenticator address 405 * @conf: Configuration for WPA authenticator 406 * @cb: Callback functions for WPA authenticator 407 * Returns: Pointer to WPA authenticator data or %NULL on failure 408 */ 409 struct wpa_authenticator * wpa_init(const u8 *addr, 410 struct wpa_auth_config *conf, 411 struct wpa_auth_callbacks *cb) 412 { 413 struct wpa_authenticator *wpa_auth; 414 415 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator)); 416 if (wpa_auth == NULL) 417 return NULL; 418 os_memcpy(wpa_auth->addr, addr, ETH_ALEN); 419 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 420 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb)); 421 422 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 423 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 424 os_free(wpa_auth); 425 return NULL; 426 } 427 428 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1); 429 if (wpa_auth->group == NULL) { 430 os_free(wpa_auth->wpa_ie); 431 os_free(wpa_auth); 432 return NULL; 433 } 434 435 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb, 436 wpa_auth); 437 if (wpa_auth->pmksa == NULL) { 438 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed."); 439 os_free(wpa_auth->group); 440 os_free(wpa_auth->wpa_ie); 441 os_free(wpa_auth); 442 return NULL; 443 } 444 445 #ifdef CONFIG_IEEE80211R 446 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init(); 447 if (wpa_auth->ft_pmk_cache == NULL) { 448 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed."); 449 os_free(wpa_auth->group); 450 os_free(wpa_auth->wpa_ie); 451 pmksa_cache_auth_deinit(wpa_auth->pmksa); 452 os_free(wpa_auth); 453 return NULL; 454 } 455 #endif /* CONFIG_IEEE80211R */ 456 457 if (wpa_auth->conf.wpa_gmk_rekey) { 458 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 459 wpa_rekey_gmk, wpa_auth, NULL); 460 } 461 462 if (wpa_auth->conf.wpa_group_rekey) { 463 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0, 464 wpa_rekey_gtk, wpa_auth, NULL); 465 } 466 467 #ifdef CONFIG_P2P 468 if (WPA_GET_BE32(conf->ip_addr_start)) { 469 int count = WPA_GET_BE32(conf->ip_addr_end) - 470 WPA_GET_BE32(conf->ip_addr_start) + 1; 471 if (count > 1000) 472 count = 1000; 473 if (count > 0) 474 wpa_auth->ip_pool = bitfield_alloc(count); 475 } 476 #endif /* CONFIG_P2P */ 477 478 return wpa_auth; 479 } 480 481 482 int wpa_init_keys(struct wpa_authenticator *wpa_auth) 483 { 484 struct wpa_group *group = wpa_auth->group; 485 486 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial " 487 "keys"); 488 wpa_group_sm_step(wpa_auth, group); 489 group->GInit = FALSE; 490 wpa_group_sm_step(wpa_auth, group); 491 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 492 return -1; 493 return 0; 494 } 495 496 497 /** 498 * wpa_deinit - Deinitialize WPA authenticator 499 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 500 */ 501 void wpa_deinit(struct wpa_authenticator *wpa_auth) 502 { 503 struct wpa_group *group, *prev; 504 505 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL); 506 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 507 508 #ifdef CONFIG_PEERKEY 509 while (wpa_auth->stsl_negotiations) 510 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations); 511 #endif /* CONFIG_PEERKEY */ 512 513 pmksa_cache_auth_deinit(wpa_auth->pmksa); 514 515 #ifdef CONFIG_IEEE80211R 516 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache); 517 wpa_auth->ft_pmk_cache = NULL; 518 #endif /* CONFIG_IEEE80211R */ 519 520 #ifdef CONFIG_P2P 521 bitfield_free(wpa_auth->ip_pool); 522 #endif /* CONFIG_P2P */ 523 524 525 os_free(wpa_auth->wpa_ie); 526 527 group = wpa_auth->group; 528 while (group) { 529 prev = group; 530 group = group->next; 531 os_free(prev); 532 } 533 534 os_free(wpa_auth); 535 } 536 537 538 /** 539 * wpa_reconfig - Update WPA authenticator configuration 540 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 541 * @conf: Configuration for WPA authenticator 542 */ 543 int wpa_reconfig(struct wpa_authenticator *wpa_auth, 544 struct wpa_auth_config *conf) 545 { 546 struct wpa_group *group; 547 if (wpa_auth == NULL) 548 return 0; 549 550 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 551 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 552 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 553 return -1; 554 } 555 556 /* 557 * Reinitialize GTK to make sure it is suitable for the new 558 * configuration. 559 */ 560 group = wpa_auth->group; 561 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 562 group->GInit = TRUE; 563 wpa_group_sm_step(wpa_auth, group); 564 group->GInit = FALSE; 565 wpa_group_sm_step(wpa_auth, group); 566 567 return 0; 568 } 569 570 571 struct wpa_state_machine * 572 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr, 573 const u8 *p2p_dev_addr) 574 { 575 struct wpa_state_machine *sm; 576 577 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 578 return NULL; 579 580 sm = os_zalloc(sizeof(struct wpa_state_machine)); 581 if (sm == NULL) 582 return NULL; 583 os_memcpy(sm->addr, addr, ETH_ALEN); 584 if (p2p_dev_addr) 585 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN); 586 587 sm->wpa_auth = wpa_auth; 588 sm->group = wpa_auth->group; 589 wpa_group_get(sm->wpa_auth, sm->group); 590 591 return sm; 592 } 593 594 595 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth, 596 struct wpa_state_machine *sm) 597 { 598 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 599 return -1; 600 601 #ifdef CONFIG_IEEE80211R 602 if (sm->ft_completed) { 603 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 604 "FT authentication already completed - do not " 605 "start 4-way handshake"); 606 /* Go to PTKINITDONE state to allow GTK rekeying */ 607 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE; 608 return 0; 609 } 610 #endif /* CONFIG_IEEE80211R */ 611 612 if (sm->started) { 613 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); 614 sm->ReAuthenticationRequest = TRUE; 615 return wpa_sm_step(sm); 616 } 617 618 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 619 "start authentication"); 620 sm->started = 1; 621 622 sm->Init = TRUE; 623 if (wpa_sm_step(sm) == 1) 624 return 1; /* should not really happen */ 625 sm->Init = FALSE; 626 sm->AuthenticationRequest = TRUE; 627 return wpa_sm_step(sm); 628 } 629 630 631 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) 632 { 633 /* WPA/RSN was not used - clear WPA state. This is needed if the STA 634 * reassociates back to the same AP while the previous entry for the 635 * STA has not yet been removed. */ 636 if (sm == NULL) 637 return; 638 639 sm->wpa_key_mgmt = 0; 640 } 641 642 643 static void wpa_free_sta_sm(struct wpa_state_machine *sm) 644 { 645 #ifdef CONFIG_P2P 646 if (WPA_GET_BE32(sm->ip_addr)) { 647 u32 start; 648 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP " 649 "address %u.%u.%u.%u from " MACSTR, 650 sm->ip_addr[0], sm->ip_addr[1], 651 sm->ip_addr[2], sm->ip_addr[3], 652 MAC2STR(sm->addr)); 653 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start); 654 bitfield_clear(sm->wpa_auth->ip_pool, 655 WPA_GET_BE32(sm->ip_addr) - start); 656 } 657 #endif /* CONFIG_P2P */ 658 if (sm->GUpdateStationKeys) { 659 sm->group->GKeyDoneStations--; 660 sm->GUpdateStationKeys = FALSE; 661 } 662 #ifdef CONFIG_IEEE80211R 663 os_free(sm->assoc_resp_ftie); 664 wpabuf_free(sm->ft_pending_req_ies); 665 #endif /* CONFIG_IEEE80211R */ 666 os_free(sm->last_rx_eapol_key); 667 os_free(sm->wpa_ie); 668 wpa_group_put(sm->wpa_auth, sm->group); 669 os_free(sm); 670 } 671 672 673 void wpa_auth_sta_deinit(struct wpa_state_machine *sm) 674 { 675 if (sm == NULL) 676 return; 677 678 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { 679 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 680 "strict rekeying - force GTK rekey since STA " 681 "is leaving"); 682 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); 683 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, 684 NULL); 685 } 686 687 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 688 sm->pending_1_of_4_timeout = 0; 689 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); 690 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 691 if (sm->in_step_loop) { 692 /* Must not free state machine while wpa_sm_step() is running. 693 * Freeing will be completed in the end of wpa_sm_step(). */ 694 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " 695 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 696 sm->pending_deinit = 1; 697 } else 698 wpa_free_sta_sm(sm); 699 } 700 701 702 static void wpa_request_new_ptk(struct wpa_state_machine *sm) 703 { 704 if (sm == NULL) 705 return; 706 707 sm->PTKRequest = TRUE; 708 sm->PTK_valid = 0; 709 } 710 711 712 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, 713 const u8 *replay_counter) 714 { 715 int i; 716 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 717 if (!ctr[i].valid) 718 break; 719 if (os_memcmp(replay_counter, ctr[i].counter, 720 WPA_REPLAY_COUNTER_LEN) == 0) 721 return 1; 722 } 723 return 0; 724 } 725 726 727 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, 728 const u8 *replay_counter) 729 { 730 int i; 731 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 732 if (ctr[i].valid && 733 (replay_counter == NULL || 734 os_memcmp(replay_counter, ctr[i].counter, 735 WPA_REPLAY_COUNTER_LEN) == 0)) 736 ctr[i].valid = FALSE; 737 } 738 } 739 740 741 #ifdef CONFIG_IEEE80211R 742 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, 743 struct wpa_state_machine *sm, 744 struct wpa_eapol_ie_parse *kde) 745 { 746 struct wpa_ie_data ie; 747 struct rsn_mdie *mdie; 748 749 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || 750 ie.num_pmkid != 1 || ie.pmkid == NULL) { 751 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " 752 "FT 4-way handshake message 2/4"); 753 return -1; 754 } 755 756 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); 757 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", 758 sm->sup_pmk_r1_name, PMKID_LEN); 759 760 if (!kde->mdie || !kde->ftie) { 761 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " 762 "message 2/4", kde->mdie ? "FTIE" : "MDIE"); 763 return -1; 764 } 765 766 mdie = (struct rsn_mdie *) (kde->mdie + 2); 767 if (kde->mdie[1] < sizeof(struct rsn_mdie) || 768 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, 769 MOBILITY_DOMAIN_ID_LEN) != 0) { 770 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); 771 return -1; 772 } 773 774 if (sm->assoc_resp_ftie && 775 (kde->ftie[1] != sm->assoc_resp_ftie[1] || 776 os_memcmp(kde->ftie, sm->assoc_resp_ftie, 777 2 + sm->assoc_resp_ftie[1]) != 0)) { 778 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); 779 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", 780 kde->ftie, kde->ftie_len); 781 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", 782 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); 783 return -1; 784 } 785 786 return 0; 787 } 788 #endif /* CONFIG_IEEE80211R */ 789 790 791 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth, 792 struct wpa_state_machine *sm, int group) 793 { 794 /* Supplicant reported a Michael MIC error */ 795 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 796 "received EAPOL-Key Error Request " 797 "(STA detected Michael MIC failure (group=%d))", 798 group); 799 800 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { 801 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 802 "ignore Michael MIC failure report since " 803 "group cipher is not TKIP"); 804 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { 805 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 806 "ignore Michael MIC failure report since " 807 "pairwise cipher is not TKIP"); 808 } else { 809 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0) 810 return 1; /* STA entry was removed */ 811 sm->dot11RSNAStatsTKIPRemoteMICFailures++; 812 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; 813 } 814 815 /* 816 * Error report is not a request for a new key handshake, but since 817 * Authenticator may do it, let's change the keys now anyway. 818 */ 819 wpa_request_new_ptk(sm); 820 return 0; 821 } 822 823 824 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data, 825 size_t data_len) 826 { 827 struct wpa_ptk PTK; 828 int ok = 0; 829 const u8 *pmk = NULL; 830 831 for (;;) { 832 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 833 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 834 sm->p2p_dev_addr, pmk); 835 if (pmk == NULL) 836 break; 837 } else 838 pmk = sm->PMK; 839 840 wpa_derive_ptk(sm, sm->alt_SNonce, pmk, &PTK); 841 842 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len) 843 == 0) { 844 ok = 1; 845 break; 846 } 847 848 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 849 break; 850 } 851 852 if (!ok) { 853 wpa_printf(MSG_DEBUG, 854 "WPA: Earlier SNonce did not result in matching MIC"); 855 return -1; 856 } 857 858 wpa_printf(MSG_DEBUG, 859 "WPA: Earlier SNonce resulted in matching MIC"); 860 sm->alt_snonce_valid = 0; 861 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN); 862 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 863 sm->PTK_valid = TRUE; 864 865 return 0; 866 } 867 868 869 void wpa_receive(struct wpa_authenticator *wpa_auth, 870 struct wpa_state_machine *sm, 871 u8 *data, size_t data_len) 872 { 873 struct ieee802_1x_hdr *hdr; 874 struct wpa_eapol_key *key; 875 struct wpa_eapol_key_192 *key192; 876 u16 key_info, key_data_length; 877 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, 878 SMK_M1, SMK_M3, SMK_ERROR } msg; 879 char *msgtxt; 880 struct wpa_eapol_ie_parse kde; 881 int ft; 882 const u8 *eapol_key_ie, *key_data; 883 size_t eapol_key_ie_len, keyhdrlen, mic_len; 884 885 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 886 return; 887 888 mic_len = wpa_mic_len(sm->wpa_key_mgmt); 889 keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key); 890 891 if (data_len < sizeof(*hdr) + keyhdrlen) 892 return; 893 894 hdr = (struct ieee802_1x_hdr *) data; 895 key = (struct wpa_eapol_key *) (hdr + 1); 896 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 897 key_info = WPA_GET_BE16(key->key_info); 898 if (mic_len == 24) { 899 key_data = (const u8 *) (key192 + 1); 900 key_data_length = WPA_GET_BE16(key192->key_data_length); 901 } else { 902 key_data = (const u8 *) (key + 1); 903 key_data_length = WPA_GET_BE16(key->key_data_length); 904 } 905 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR 906 " key_info=0x%x type=%u key_data_length=%u", 907 MAC2STR(sm->addr), key_info, key->type, key_data_length); 908 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) { 909 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " 910 "key_data overflow (%d > %lu)", 911 key_data_length, 912 (unsigned long) (data_len - sizeof(*hdr) - 913 keyhdrlen)); 914 return; 915 } 916 917 if (sm->wpa == WPA_VERSION_WPA2) { 918 if (key->type == EAPOL_KEY_TYPE_WPA) { 919 /* 920 * Some deployed station implementations seem to send 921 * msg 4/4 with incorrect type value in WPA2 mode. 922 */ 923 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " 924 "with unexpected WPA type in RSN mode"); 925 } else if (key->type != EAPOL_KEY_TYPE_RSN) { 926 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 927 "unexpected type %d in RSN mode", 928 key->type); 929 return; 930 } 931 } else { 932 if (key->type != EAPOL_KEY_TYPE_WPA) { 933 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 934 "unexpected type %d in WPA mode", 935 key->type); 936 return; 937 } 938 } 939 940 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, 941 WPA_NONCE_LEN); 942 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", 943 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 944 945 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys 946 * are set */ 947 948 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == 949 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { 950 if (key_info & WPA_KEY_INFO_ERROR) { 951 msg = SMK_ERROR; 952 msgtxt = "SMK Error"; 953 } else { 954 msg = SMK_M1; 955 msgtxt = "SMK M1"; 956 } 957 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 958 msg = SMK_M3; 959 msgtxt = "SMK M3"; 960 } else if (key_info & WPA_KEY_INFO_REQUEST) { 961 msg = REQUEST; 962 msgtxt = "Request"; 963 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { 964 msg = GROUP_2; 965 msgtxt = "2/2 Group"; 966 } else if (key_data_length == 0) { 967 msg = PAIRWISE_4; 968 msgtxt = "4/4 Pairwise"; 969 } else { 970 msg = PAIRWISE_2; 971 msgtxt = "2/4 Pairwise"; 972 } 973 974 /* TODO: key_info type validation for PeerKey */ 975 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || 976 msg == GROUP_2) { 977 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 978 if (sm->pairwise == WPA_CIPHER_CCMP || 979 sm->pairwise == WPA_CIPHER_GCMP) { 980 if (wpa_use_aes_cmac(sm) && 981 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN && 982 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) && 983 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 984 wpa_auth_logger(wpa_auth, sm->addr, 985 LOGGER_WARNING, 986 "advertised support for " 987 "AES-128-CMAC, but did not " 988 "use it"); 989 return; 990 } 991 992 if (!wpa_use_aes_cmac(sm) && 993 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 994 wpa_auth_logger(wpa_auth, sm->addr, 995 LOGGER_WARNING, 996 "did not use HMAC-SHA1-AES " 997 "with CCMP/GCMP"); 998 return; 999 } 1000 } 1001 1002 if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) && 1003 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) { 1004 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 1005 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases"); 1006 return; 1007 } 1008 } 1009 1010 if (key_info & WPA_KEY_INFO_REQUEST) { 1011 if (sm->req_replay_counter_used && 1012 os_memcmp(key->replay_counter, sm->req_replay_counter, 1013 WPA_REPLAY_COUNTER_LEN) <= 0) { 1014 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 1015 "received EAPOL-Key request with " 1016 "replayed counter"); 1017 return; 1018 } 1019 } 1020 1021 if (!(key_info & WPA_KEY_INFO_REQUEST) && 1022 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { 1023 int i; 1024 1025 if (msg == PAIRWISE_2 && 1026 wpa_replay_counter_valid(sm->prev_key_replay, 1027 key->replay_counter) && 1028 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 1029 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) 1030 { 1031 /* 1032 * Some supplicant implementations (e.g., Windows XP 1033 * WZC) update SNonce for each EAPOL-Key 2/4. This 1034 * breaks the workaround on accepting any of the 1035 * pending requests, so allow the SNonce to be updated 1036 * even if we have already sent out EAPOL-Key 3/4. 1037 */ 1038 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1039 "Process SNonce update from STA " 1040 "based on retransmitted EAPOL-Key " 1041 "1/4"); 1042 sm->update_snonce = 1; 1043 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN); 1044 sm->alt_snonce_valid = TRUE; 1045 os_memcpy(sm->alt_replay_counter, 1046 sm->key_replay[0].counter, 1047 WPA_REPLAY_COUNTER_LEN); 1048 goto continue_processing; 1049 } 1050 1051 if (msg == PAIRWISE_4 && sm->alt_snonce_valid && 1052 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 1053 os_memcmp(key->replay_counter, sm->alt_replay_counter, 1054 WPA_REPLAY_COUNTER_LEN) == 0) { 1055 /* 1056 * Supplicant may still be using the old SNonce since 1057 * there was two EAPOL-Key 2/4 messages and they had 1058 * different SNonce values. 1059 */ 1060 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1061 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4"); 1062 goto continue_processing; 1063 } 1064 1065 if (msg == PAIRWISE_2 && 1066 wpa_replay_counter_valid(sm->prev_key_replay, 1067 key->replay_counter) && 1068 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { 1069 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1070 "ignore retransmitted EAPOL-Key %s - " 1071 "SNonce did not change", msgtxt); 1072 } else { 1073 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1074 "received EAPOL-Key %s with " 1075 "unexpected replay counter", msgtxt); 1076 } 1077 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 1078 if (!sm->key_replay[i].valid) 1079 break; 1080 wpa_hexdump(MSG_DEBUG, "pending replay counter", 1081 sm->key_replay[i].counter, 1082 WPA_REPLAY_COUNTER_LEN); 1083 } 1084 wpa_hexdump(MSG_DEBUG, "received replay counter", 1085 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1086 return; 1087 } 1088 1089 continue_processing: 1090 switch (msg) { 1091 case PAIRWISE_2: 1092 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && 1093 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && 1094 (!sm->update_snonce || 1095 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { 1096 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1097 "received EAPOL-Key msg 2/4 in " 1098 "invalid state (%d) - dropped", 1099 sm->wpa_ptk_state); 1100 return; 1101 } 1102 random_add_randomness(key->key_nonce, WPA_NONCE_LEN); 1103 if (sm->group->reject_4way_hs_for_entropy) { 1104 /* 1105 * The system did not have enough entropy to generate 1106 * strong random numbers. Reject the first 4-way 1107 * handshake(s) and collect some entropy based on the 1108 * information from it. Once enough entropy is 1109 * available, the next atempt will trigger GMK/Key 1110 * Counter update and the station will be allowed to 1111 * continue. 1112 */ 1113 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " 1114 "collect more entropy for random number " 1115 "generation"); 1116 random_mark_pool_ready(); 1117 wpa_sta_disconnect(wpa_auth, sm->addr); 1118 return; 1119 } 1120 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) { 1121 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1122 "received EAPOL-Key msg 2/4 with " 1123 "invalid Key Data contents"); 1124 return; 1125 } 1126 if (kde.rsn_ie) { 1127 eapol_key_ie = kde.rsn_ie; 1128 eapol_key_ie_len = kde.rsn_ie_len; 1129 } else if (kde.osen) { 1130 eapol_key_ie = kde.osen; 1131 eapol_key_ie_len = kde.osen_len; 1132 } else { 1133 eapol_key_ie = kde.wpa_ie; 1134 eapol_key_ie_len = kde.wpa_ie_len; 1135 } 1136 ft = sm->wpa == WPA_VERSION_WPA2 && 1137 wpa_key_mgmt_ft(sm->wpa_key_mgmt); 1138 if (sm->wpa_ie == NULL || 1139 wpa_compare_rsn_ie(ft, 1140 sm->wpa_ie, sm->wpa_ie_len, 1141 eapol_key_ie, eapol_key_ie_len)) { 1142 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1143 "WPA IE from (Re)AssocReq did not " 1144 "match with msg 2/4"); 1145 if (sm->wpa_ie) { 1146 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", 1147 sm->wpa_ie, sm->wpa_ie_len); 1148 } 1149 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", 1150 eapol_key_ie, eapol_key_ie_len); 1151 /* MLME-DEAUTHENTICATE.request */ 1152 wpa_sta_disconnect(wpa_auth, sm->addr); 1153 return; 1154 } 1155 #ifdef CONFIG_IEEE80211R 1156 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { 1157 wpa_sta_disconnect(wpa_auth, sm->addr); 1158 return; 1159 } 1160 #endif /* CONFIG_IEEE80211R */ 1161 #ifdef CONFIG_P2P 1162 if (kde.ip_addr_req && kde.ip_addr_req[0] && 1163 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) { 1164 int idx; 1165 wpa_printf(MSG_DEBUG, "P2P: IP address requested in " 1166 "EAPOL-Key exchange"); 1167 idx = bitfield_get_first_zero(wpa_auth->ip_pool); 1168 if (idx >= 0) { 1169 u32 start = WPA_GET_BE32(wpa_auth->conf. 1170 ip_addr_start); 1171 bitfield_set(wpa_auth->ip_pool, idx); 1172 WPA_PUT_BE32(sm->ip_addr, start + idx); 1173 wpa_printf(MSG_DEBUG, "P2P: Assigned IP " 1174 "address %u.%u.%u.%u to " MACSTR, 1175 sm->ip_addr[0], sm->ip_addr[1], 1176 sm->ip_addr[2], sm->ip_addr[3], 1177 MAC2STR(sm->addr)); 1178 } 1179 } 1180 #endif /* CONFIG_P2P */ 1181 break; 1182 case PAIRWISE_4: 1183 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || 1184 !sm->PTK_valid) { 1185 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1186 "received EAPOL-Key msg 4/4 in " 1187 "invalid state (%d) - dropped", 1188 sm->wpa_ptk_state); 1189 return; 1190 } 1191 break; 1192 case GROUP_2: 1193 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING 1194 || !sm->PTK_valid) { 1195 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1196 "received EAPOL-Key msg 2/2 in " 1197 "invalid state (%d) - dropped", 1198 sm->wpa_ptk_group_state); 1199 return; 1200 } 1201 break; 1202 #ifdef CONFIG_PEERKEY 1203 case SMK_M1: 1204 case SMK_M3: 1205 case SMK_ERROR: 1206 if (!wpa_auth->conf.peerkey) { 1207 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " 1208 "PeerKey use disabled - ignoring message"); 1209 return; 1210 } 1211 if (!sm->PTK_valid) { 1212 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1213 "received EAPOL-Key msg SMK in " 1214 "invalid state - dropped"); 1215 return; 1216 } 1217 break; 1218 #else /* CONFIG_PEERKEY */ 1219 case SMK_M1: 1220 case SMK_M3: 1221 case SMK_ERROR: 1222 return; /* STSL disabled - ignore SMK messages */ 1223 #endif /* CONFIG_PEERKEY */ 1224 case REQUEST: 1225 break; 1226 } 1227 1228 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1229 "received EAPOL-Key frame (%s)", msgtxt); 1230 1231 if (key_info & WPA_KEY_INFO_ACK) { 1232 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1233 "received invalid EAPOL-Key: Key Ack set"); 1234 return; 1235 } 1236 1237 if (!(key_info & WPA_KEY_INFO_MIC)) { 1238 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1239 "received invalid EAPOL-Key: Key MIC not set"); 1240 return; 1241 } 1242 1243 sm->MICVerified = FALSE; 1244 if (sm->PTK_valid && !sm->update_snonce) { 1245 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data, 1246 data_len) && 1247 (msg != PAIRWISE_4 || !sm->alt_snonce_valid || 1248 wpa_try_alt_snonce(sm, data, data_len))) { 1249 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1250 "received EAPOL-Key with invalid MIC"); 1251 return; 1252 } 1253 sm->MICVerified = TRUE; 1254 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 1255 sm->pending_1_of_4_timeout = 0; 1256 } 1257 1258 if (key_info & WPA_KEY_INFO_REQUEST) { 1259 if (sm->MICVerified) { 1260 sm->req_replay_counter_used = 1; 1261 os_memcpy(sm->req_replay_counter, key->replay_counter, 1262 WPA_REPLAY_COUNTER_LEN); 1263 } else { 1264 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1265 "received EAPOL-Key request with " 1266 "invalid MIC"); 1267 return; 1268 } 1269 1270 /* 1271 * TODO: should decrypt key data field if encryption was used; 1272 * even though MAC address KDE is not normally encrypted, 1273 * supplicant is allowed to encrypt it. 1274 */ 1275 if (msg == SMK_ERROR) { 1276 #ifdef CONFIG_PEERKEY 1277 wpa_smk_error(wpa_auth, sm, key_data, key_data_length); 1278 #endif /* CONFIG_PEERKEY */ 1279 return; 1280 } else if (key_info & WPA_KEY_INFO_ERROR) { 1281 if (wpa_receive_error_report( 1282 wpa_auth, sm, 1283 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0) 1284 return; /* STA entry was removed */ 1285 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1286 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1287 "received EAPOL-Key Request for new " 1288 "4-Way Handshake"); 1289 wpa_request_new_ptk(sm); 1290 #ifdef CONFIG_PEERKEY 1291 } else if (msg == SMK_M1) { 1292 wpa_smk_m1(wpa_auth, sm, key, key_data, 1293 key_data_length); 1294 #endif /* CONFIG_PEERKEY */ 1295 } else if (key_data_length > 0 && 1296 wpa_parse_kde_ies(key_data, key_data_length, 1297 &kde) == 0 && 1298 kde.mac_addr) { 1299 } else { 1300 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1301 "received EAPOL-Key Request for GTK " 1302 "rekeying"); 1303 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 1304 wpa_rekey_gtk(wpa_auth, NULL); 1305 } 1306 } else { 1307 /* Do not allow the same key replay counter to be reused. */ 1308 wpa_replay_counter_mark_invalid(sm->key_replay, 1309 key->replay_counter); 1310 1311 if (msg == PAIRWISE_2) { 1312 /* 1313 * Maintain a copy of the pending EAPOL-Key frames in 1314 * case the EAPOL-Key frame was retransmitted. This is 1315 * needed to allow EAPOL-Key msg 2/4 reply to another 1316 * pending msg 1/4 to update the SNonce to work around 1317 * unexpected supplicant behavior. 1318 */ 1319 os_memcpy(sm->prev_key_replay, sm->key_replay, 1320 sizeof(sm->key_replay)); 1321 } else { 1322 os_memset(sm->prev_key_replay, 0, 1323 sizeof(sm->prev_key_replay)); 1324 } 1325 1326 /* 1327 * Make sure old valid counters are not accepted anymore and 1328 * do not get copied again. 1329 */ 1330 wpa_replay_counter_mark_invalid(sm->key_replay, NULL); 1331 } 1332 1333 #ifdef CONFIG_PEERKEY 1334 if (msg == SMK_M3) { 1335 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length); 1336 return; 1337 } 1338 #endif /* CONFIG_PEERKEY */ 1339 1340 os_free(sm->last_rx_eapol_key); 1341 sm->last_rx_eapol_key = os_malloc(data_len); 1342 if (sm->last_rx_eapol_key == NULL) 1343 return; 1344 os_memcpy(sm->last_rx_eapol_key, data, data_len); 1345 sm->last_rx_eapol_key_len = data_len; 1346 1347 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); 1348 sm->EAPOLKeyReceived = TRUE; 1349 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1350 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); 1351 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); 1352 wpa_sm_step(sm); 1353 } 1354 1355 1356 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, 1357 const u8 *gnonce, u8 *gtk, size_t gtk_len) 1358 { 1359 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; 1360 u8 *pos; 1361 int ret = 0; 1362 1363 /* GTK = PRF-X(GMK, "Group key expansion", 1364 * AA || GNonce || Time || random data) 1365 * The example described in the IEEE 802.11 standard uses only AA and 1366 * GNonce as inputs here. Add some more entropy since this derivation 1367 * is done only at the Authenticator and as such, does not need to be 1368 * exactly same. 1369 */ 1370 os_memcpy(data, addr, ETH_ALEN); 1371 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); 1372 pos = data + ETH_ALEN + WPA_NONCE_LEN; 1373 wpa_get_ntp_timestamp(pos); 1374 pos += 8; 1375 if (random_get_bytes(pos, 16) < 0) 1376 ret = -1; 1377 1378 #ifdef CONFIG_IEEE80211W 1379 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); 1380 #else /* CONFIG_IEEE80211W */ 1381 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) 1382 < 0) 1383 ret = -1; 1384 #endif /* CONFIG_IEEE80211W */ 1385 1386 return ret; 1387 } 1388 1389 1390 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) 1391 { 1392 struct wpa_authenticator *wpa_auth = eloop_ctx; 1393 struct wpa_state_machine *sm = timeout_ctx; 1394 1395 sm->pending_1_of_4_timeout = 0; 1396 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); 1397 sm->TimeoutEvt = TRUE; 1398 wpa_sm_step(sm); 1399 } 1400 1401 1402 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1403 struct wpa_state_machine *sm, int key_info, 1404 const u8 *key_rsc, const u8 *nonce, 1405 const u8 *kde, size_t kde_len, 1406 int keyidx, int encr, int force_version) 1407 { 1408 struct ieee802_1x_hdr *hdr; 1409 struct wpa_eapol_key *key; 1410 struct wpa_eapol_key_192 *key192; 1411 size_t len, mic_len, keyhdrlen; 1412 int alg; 1413 int key_data_len, pad_len = 0; 1414 u8 *buf, *pos; 1415 int version, pairwise; 1416 int i; 1417 u8 *key_data; 1418 1419 mic_len = wpa_mic_len(sm->wpa_key_mgmt); 1420 keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key); 1421 1422 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen; 1423 1424 if (force_version) 1425 version = force_version; 1426 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1427 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) 1428 version = WPA_KEY_INFO_TYPE_AKM_DEFINED; 1429 else if (wpa_use_aes_cmac(sm)) 1430 version = WPA_KEY_INFO_TYPE_AES_128_CMAC; 1431 else if (sm->pairwise != WPA_CIPHER_TKIP) 1432 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 1433 else 1434 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 1435 1436 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1437 1438 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " 1439 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " 1440 "encr=%d)", 1441 version, 1442 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, 1443 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, 1444 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, 1445 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, 1446 pairwise, (unsigned long) kde_len, keyidx, encr); 1447 1448 key_data_len = kde_len; 1449 1450 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1451 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1452 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) || 1453 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { 1454 pad_len = key_data_len % 8; 1455 if (pad_len) 1456 pad_len = 8 - pad_len; 1457 key_data_len += pad_len + 8; 1458 } 1459 1460 len += key_data_len; 1461 1462 hdr = os_zalloc(len); 1463 if (hdr == NULL) 1464 return; 1465 hdr->version = wpa_auth->conf.eapol_version; 1466 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; 1467 hdr->length = host_to_be16(len - sizeof(*hdr)); 1468 key = (struct wpa_eapol_key *) (hdr + 1); 1469 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 1470 key_data = ((u8 *) (hdr + 1)) + keyhdrlen; 1471 1472 key->type = sm->wpa == WPA_VERSION_WPA2 ? 1473 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1474 key_info |= version; 1475 if (encr && sm->wpa == WPA_VERSION_WPA2) 1476 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1477 if (sm->wpa != WPA_VERSION_WPA2) 1478 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; 1479 WPA_PUT_BE16(key->key_info, key_info); 1480 1481 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; 1482 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); 1483 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) 1484 WPA_PUT_BE16(key->key_length, 0); 1485 1486 /* FIX: STSL: what to use as key_replay_counter? */ 1487 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { 1488 sm->key_replay[i].valid = sm->key_replay[i - 1].valid; 1489 os_memcpy(sm->key_replay[i].counter, 1490 sm->key_replay[i - 1].counter, 1491 WPA_REPLAY_COUNTER_LEN); 1492 } 1493 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); 1494 os_memcpy(key->replay_counter, sm->key_replay[0].counter, 1495 WPA_REPLAY_COUNTER_LEN); 1496 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", 1497 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1498 sm->key_replay[0].valid = TRUE; 1499 1500 if (nonce) 1501 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); 1502 1503 if (key_rsc) 1504 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); 1505 1506 if (kde && !encr) { 1507 os_memcpy(key_data, kde, kde_len); 1508 if (mic_len == 24) 1509 WPA_PUT_BE16(key192->key_data_length, kde_len); 1510 else 1511 WPA_PUT_BE16(key->key_data_length, kde_len); 1512 } else if (encr && kde) { 1513 buf = os_zalloc(key_data_len); 1514 if (buf == NULL) { 1515 os_free(hdr); 1516 return; 1517 } 1518 pos = buf; 1519 os_memcpy(pos, kde, kde_len); 1520 pos += kde_len; 1521 1522 if (pad_len) 1523 *pos++ = 0xdd; 1524 1525 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", 1526 buf, key_data_len); 1527 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1528 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1529 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) || 1530 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1531 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, 1532 (key_data_len - 8) / 8, buf, key_data)) { 1533 os_free(hdr); 1534 os_free(buf); 1535 return; 1536 } 1537 if (mic_len == 24) 1538 WPA_PUT_BE16(key192->key_data_length, 1539 key_data_len); 1540 else 1541 WPA_PUT_BE16(key->key_data_length, 1542 key_data_len); 1543 #ifndef CONFIG_NO_RC4 1544 } else if (sm->PTK.kek_len == 16) { 1545 u8 ek[32]; 1546 os_memcpy(key->key_iv, 1547 sm->group->Counter + WPA_NONCE_LEN - 16, 16); 1548 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); 1549 os_memcpy(ek, key->key_iv, 16); 1550 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len); 1551 os_memcpy(key_data, buf, key_data_len); 1552 rc4_skip(ek, 32, 256, key_data, key_data_len); 1553 if (mic_len == 24) 1554 WPA_PUT_BE16(key192->key_data_length, 1555 key_data_len); 1556 else 1557 WPA_PUT_BE16(key->key_data_length, 1558 key_data_len); 1559 #endif /* CONFIG_NO_RC4 */ 1560 } else { 1561 os_free(hdr); 1562 os_free(buf); 1563 return; 1564 } 1565 os_free(buf); 1566 } 1567 1568 if (key_info & WPA_KEY_INFO_MIC) { 1569 u8 *key_mic; 1570 1571 if (!sm->PTK_valid) { 1572 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 1573 "PTK not valid when sending EAPOL-Key " 1574 "frame"); 1575 os_free(hdr); 1576 return; 1577 } 1578 1579 key_mic = key192->key_mic; /* same offset for key and key192 */ 1580 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len, 1581 sm->wpa_key_mgmt, version, 1582 (u8 *) hdr, len, key_mic); 1583 #ifdef CONFIG_TESTING_OPTIONS 1584 if (!pairwise && 1585 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 && 1586 drand48() < 1587 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { 1588 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1589 "Corrupting group EAPOL-Key Key MIC"); 1590 key_mic[0]++; 1591 } 1592 #endif /* CONFIG_TESTING_OPTIONS */ 1593 } 1594 1595 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, 1596 1); 1597 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, 1598 sm->pairwise_set); 1599 os_free(hdr); 1600 } 1601 1602 1603 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1604 struct wpa_state_machine *sm, int key_info, 1605 const u8 *key_rsc, const u8 *nonce, 1606 const u8 *kde, size_t kde_len, 1607 int keyidx, int encr) 1608 { 1609 int timeout_ms; 1610 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; 1611 int ctr; 1612 1613 if (sm == NULL) 1614 return; 1615 1616 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, 1617 keyidx, encr, 0); 1618 1619 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; 1620 if (ctr == 1 && wpa_auth->conf.tx_status) 1621 timeout_ms = pairwise ? eapol_key_timeout_first : 1622 eapol_key_timeout_first_group; 1623 else 1624 timeout_ms = eapol_key_timeout_subseq; 1625 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) 1626 sm->pending_1_of_4_timeout = 1; 1627 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " 1628 "counter %d)", timeout_ms, ctr); 1629 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, 1630 wpa_send_eapol_timeout, wpa_auth, sm); 1631 } 1632 1633 1634 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data, 1635 size_t data_len) 1636 { 1637 struct ieee802_1x_hdr *hdr; 1638 struct wpa_eapol_key *key; 1639 struct wpa_eapol_key_192 *key192; 1640 u16 key_info; 1641 int ret = 0; 1642 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1643 size_t mic_len = wpa_mic_len(akmp); 1644 1645 if (data_len < sizeof(*hdr) + sizeof(*key)) 1646 return -1; 1647 1648 hdr = (struct ieee802_1x_hdr *) data; 1649 key = (struct wpa_eapol_key *) (hdr + 1); 1650 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 1651 key_info = WPA_GET_BE16(key->key_info); 1652 os_memcpy(mic, key192->key_mic, mic_len); 1653 os_memset(key192->key_mic, 0, mic_len); 1654 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp, 1655 key_info & WPA_KEY_INFO_TYPE_MASK, 1656 data, data_len, key192->key_mic) || 1657 os_memcmp_const(mic, key192->key_mic, mic_len) != 0) 1658 ret = -1; 1659 os_memcpy(key192->key_mic, mic, mic_len); 1660 return ret; 1661 } 1662 1663 1664 void wpa_remove_ptk(struct wpa_state_machine *sm) 1665 { 1666 sm->PTK_valid = FALSE; 1667 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1668 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); 1669 sm->pairwise_set = FALSE; 1670 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 1671 } 1672 1673 1674 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event) 1675 { 1676 int remove_ptk = 1; 1677 1678 if (sm == NULL) 1679 return -1; 1680 1681 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1682 "event %d notification", event); 1683 1684 switch (event) { 1685 case WPA_AUTH: 1686 #ifdef CONFIG_MESH 1687 /* PTKs are derived through AMPE */ 1688 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) { 1689 /* not mesh */ 1690 break; 1691 } 1692 return 0; 1693 #endif /* CONFIG_MESH */ 1694 case WPA_ASSOC: 1695 break; 1696 case WPA_DEAUTH: 1697 case WPA_DISASSOC: 1698 sm->DeauthenticationRequest = TRUE; 1699 break; 1700 case WPA_REAUTH: 1701 case WPA_REAUTH_EAPOL: 1702 if (!sm->started) { 1703 /* 1704 * When using WPS, we may end up here if the STA 1705 * manages to re-associate without the previous STA 1706 * entry getting removed. Consequently, we need to make 1707 * sure that the WPA state machines gets initialized 1708 * properly at this point. 1709 */ 1710 wpa_printf(MSG_DEBUG, "WPA state machine had not been " 1711 "started - initialize now"); 1712 sm->started = 1; 1713 sm->Init = TRUE; 1714 if (wpa_sm_step(sm) == 1) 1715 return 1; /* should not really happen */ 1716 sm->Init = FALSE; 1717 sm->AuthenticationRequest = TRUE; 1718 break; 1719 } 1720 if (sm->GUpdateStationKeys) { 1721 /* 1722 * Reauthentication cancels the pending group key 1723 * update for this STA. 1724 */ 1725 sm->group->GKeyDoneStations--; 1726 sm->GUpdateStationKeys = FALSE; 1727 sm->PtkGroupInit = TRUE; 1728 } 1729 sm->ReAuthenticationRequest = TRUE; 1730 break; 1731 case WPA_ASSOC_FT: 1732 #ifdef CONFIG_IEEE80211R 1733 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " 1734 "after association"); 1735 wpa_ft_install_ptk(sm); 1736 1737 /* Using FT protocol, not WPA auth state machine */ 1738 sm->ft_completed = 1; 1739 return 0; 1740 #else /* CONFIG_IEEE80211R */ 1741 break; 1742 #endif /* CONFIG_IEEE80211R */ 1743 } 1744 1745 #ifdef CONFIG_IEEE80211R 1746 sm->ft_completed = 0; 1747 #endif /* CONFIG_IEEE80211R */ 1748 1749 #ifdef CONFIG_IEEE80211W 1750 if (sm->mgmt_frame_prot && event == WPA_AUTH) 1751 remove_ptk = 0; 1752 #endif /* CONFIG_IEEE80211W */ 1753 1754 if (remove_ptk) { 1755 sm->PTK_valid = FALSE; 1756 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1757 1758 if (event != WPA_REAUTH_EAPOL) 1759 wpa_remove_ptk(sm); 1760 } 1761 1762 if (sm->in_step_loop) { 1763 /* 1764 * wpa_sm_step() is already running - avoid recursive call to 1765 * it by making the existing loop process the new update. 1766 */ 1767 sm->changed = TRUE; 1768 return 0; 1769 } 1770 return wpa_sm_step(sm); 1771 } 1772 1773 1774 SM_STATE(WPA_PTK, INITIALIZE) 1775 { 1776 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); 1777 if (sm->Init) { 1778 /* Init flag is not cleared here, so avoid busy 1779 * loop by claiming nothing changed. */ 1780 sm->changed = FALSE; 1781 } 1782 1783 sm->keycount = 0; 1784 if (sm->GUpdateStationKeys) 1785 sm->group->GKeyDoneStations--; 1786 sm->GUpdateStationKeys = FALSE; 1787 if (sm->wpa == WPA_VERSION_WPA) 1788 sm->PInitAKeys = FALSE; 1789 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and 1790 * Local AA > Remote AA)) */) { 1791 sm->Pair = TRUE; 1792 } 1793 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); 1794 wpa_remove_ptk(sm); 1795 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); 1796 sm->TimeoutCtr = 0; 1797 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1798 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 1799 WPA_EAPOL_authorized, 0); 1800 } 1801 } 1802 1803 1804 SM_STATE(WPA_PTK, DISCONNECT) 1805 { 1806 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); 1807 sm->Disconnect = FALSE; 1808 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 1809 } 1810 1811 1812 SM_STATE(WPA_PTK, DISCONNECTED) 1813 { 1814 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); 1815 sm->DeauthenticationRequest = FALSE; 1816 } 1817 1818 1819 SM_STATE(WPA_PTK, AUTHENTICATION) 1820 { 1821 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); 1822 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1823 sm->PTK_valid = FALSE; 1824 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, 1825 1); 1826 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); 1827 sm->AuthenticationRequest = FALSE; 1828 } 1829 1830 1831 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, 1832 struct wpa_group *group) 1833 { 1834 if (group->first_sta_seen) 1835 return; 1836 /* 1837 * System has run bit further than at the time hostapd was started 1838 * potentially very early during boot up. This provides better chances 1839 * of collecting more randomness on embedded systems. Re-initialize the 1840 * GMK and Counter here to improve their strength if there was not 1841 * enough entropy available immediately after system startup. 1842 */ 1843 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " 1844 "station"); 1845 if (random_pool_ready() != 1) { 1846 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 1847 "to proceed - reject first 4-way handshake"); 1848 group->reject_4way_hs_for_entropy = TRUE; 1849 } else { 1850 group->first_sta_seen = TRUE; 1851 group->reject_4way_hs_for_entropy = FALSE; 1852 } 1853 1854 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 || 1855 wpa_gtk_update(wpa_auth, group) < 0 || 1856 wpa_group_config_group_keys(wpa_auth, group) < 0) { 1857 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed"); 1858 group->first_sta_seen = FALSE; 1859 group->reject_4way_hs_for_entropy = TRUE; 1860 } 1861 } 1862 1863 1864 SM_STATE(WPA_PTK, AUTHENTICATION2) 1865 { 1866 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); 1867 1868 wpa_group_ensure_init(sm->wpa_auth, sm->group); 1869 sm->ReAuthenticationRequest = FALSE; 1870 1871 /* 1872 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat 1873 * ambiguous. The Authenticator state machine uses a counter that is 1874 * incremented by one for each 4-way handshake. However, the security 1875 * analysis of 4-way handshake points out that unpredictable nonces 1876 * help in preventing precomputation attacks. Instead of the state 1877 * machine definition, use an unpredictable nonce value here to provide 1878 * stronger protection against potential precomputation attacks. 1879 */ 1880 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1881 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " 1882 "ANonce."); 1883 sm->Disconnect = TRUE; 1884 return; 1885 } 1886 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, 1887 WPA_NONCE_LEN); 1888 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more 1889 * logical place than INITIALIZE since AUTHENTICATION2 can be 1890 * re-entered on ReAuthenticationRequest without going through 1891 * INITIALIZE. */ 1892 sm->TimeoutCtr = 0; 1893 } 1894 1895 1896 SM_STATE(WPA_PTK, INITPMK) 1897 { 1898 u8 msk[2 * PMK_LEN]; 1899 size_t len = 2 * PMK_LEN; 1900 1901 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); 1902 #ifdef CONFIG_IEEE80211R 1903 sm->xxkey_len = 0; 1904 #endif /* CONFIG_IEEE80211R */ 1905 if (sm->pmksa) { 1906 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); 1907 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); 1908 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { 1909 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " 1910 "(len=%lu)", (unsigned long) len); 1911 os_memcpy(sm->PMK, msk, PMK_LEN); 1912 #ifdef CONFIG_IEEE80211R 1913 if (len >= 2 * PMK_LEN) { 1914 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); 1915 sm->xxkey_len = PMK_LEN; 1916 } 1917 #endif /* CONFIG_IEEE80211R */ 1918 } else { 1919 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p", 1920 sm->wpa_auth->cb.get_msk); 1921 sm->Disconnect = TRUE; 1922 return; 1923 } 1924 os_memset(msk, 0, sizeof(msk)); 1925 1926 sm->req_replay_counter_used = 0; 1927 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this 1928 * will break reauthentication since EAPOL state machines may not be 1929 * get into AUTHENTICATING state that clears keyRun before WPA state 1930 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK 1931 * state and takes PMK from the previously used AAA Key. This will 1932 * eventually fail in 4-Way Handshake because Supplicant uses PMK 1933 * derived from the new AAA Key. Setting keyRun = FALSE here seems to 1934 * be good workaround for this issue. */ 1935 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); 1936 } 1937 1938 1939 SM_STATE(WPA_PTK, INITPSK) 1940 { 1941 const u8 *psk; 1942 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); 1943 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL); 1944 if (psk) { 1945 os_memcpy(sm->PMK, psk, PMK_LEN); 1946 #ifdef CONFIG_IEEE80211R 1947 os_memcpy(sm->xxkey, psk, PMK_LEN); 1948 sm->xxkey_len = PMK_LEN; 1949 #endif /* CONFIG_IEEE80211R */ 1950 } 1951 sm->req_replay_counter_used = 0; 1952 } 1953 1954 1955 SM_STATE(WPA_PTK, PTKSTART) 1956 { 1957 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; 1958 size_t pmkid_len = 0; 1959 1960 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); 1961 sm->PTKRequest = FALSE; 1962 sm->TimeoutEvt = FALSE; 1963 sm->alt_snonce_valid = FALSE; 1964 1965 sm->TimeoutCtr++; 1966 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1967 /* No point in sending the EAPOL-Key - we will disconnect 1968 * immediately following this. */ 1969 return; 1970 } 1971 1972 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1973 "sending 1/4 msg of 4-Way Handshake"); 1974 /* 1975 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only 1976 * one possible PSK for this STA. 1977 */ 1978 if (sm->wpa == WPA_VERSION_WPA2 && 1979 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 1980 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) { 1981 pmkid = buf; 1982 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 1983 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; 1984 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; 1985 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); 1986 if (sm->pmksa) { 1987 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], 1988 sm->pmksa->pmkid, PMKID_LEN); 1989 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) { 1990 /* No KCK available to derive PMKID */ 1991 pmkid = NULL; 1992 } else { 1993 /* 1994 * Calculate PMKID since no PMKSA cache entry was 1995 * available with pre-calculated PMKID. 1996 */ 1997 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, 1998 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], 1999 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 2000 } 2001 } 2002 wpa_send_eapol(sm->wpa_auth, sm, 2003 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, 2004 sm->ANonce, pmkid, pmkid_len, 0, 0); 2005 } 2006 2007 2008 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce, 2009 const u8 *pmk, struct wpa_ptk *ptk) 2010 { 2011 #ifdef CONFIG_IEEE80211R 2012 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 2013 return wpa_auth_derive_ptk_ft(sm, pmk, ptk); 2014 #endif /* CONFIG_IEEE80211R */ 2015 2016 return wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", 2017 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce, 2018 ptk, sm->wpa_key_mgmt, sm->pairwise); 2019 } 2020 2021 2022 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) 2023 { 2024 struct wpa_ptk PTK; 2025 int ok = 0, psk_found = 0; 2026 const u8 *pmk = NULL; 2027 2028 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); 2029 sm->EAPOLKeyReceived = FALSE; 2030 sm->update_snonce = FALSE; 2031 2032 /* WPA with IEEE 802.1X: use the derived PMK from EAP 2033 * WPA-PSK: iterate through possible PSKs and select the one matching 2034 * the packet */ 2035 for (;;) { 2036 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2037 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 2038 sm->p2p_dev_addr, pmk); 2039 if (pmk == NULL) 2040 break; 2041 psk_found = 1; 2042 } else 2043 pmk = sm->PMK; 2044 2045 wpa_derive_ptk(sm, sm->SNonce, pmk, &PTK); 2046 2047 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, 2048 sm->last_rx_eapol_key, 2049 sm->last_rx_eapol_key_len) == 0) { 2050 ok = 1; 2051 break; 2052 } 2053 2054 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 2055 break; 2056 } 2057 2058 if (!ok) { 2059 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2060 "invalid MIC in msg 2/4 of 4-Way Handshake"); 2061 if (psk_found) 2062 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr); 2063 return; 2064 } 2065 2066 #ifdef CONFIG_IEEE80211R 2067 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2068 /* 2069 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches 2070 * with the value we derived. 2071 */ 2072 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name, 2073 WPA_PMK_NAME_LEN) != 0) { 2074 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2075 "PMKR1Name mismatch in FT 4-way " 2076 "handshake"); 2077 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " 2078 "Supplicant", 2079 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); 2080 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 2081 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 2082 return; 2083 } 2084 } 2085 #endif /* CONFIG_IEEE80211R */ 2086 2087 sm->pending_1_of_4_timeout = 0; 2088 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 2089 2090 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2091 /* PSK may have changed from the previous choice, so update 2092 * state machine data based on whatever PSK was selected here. 2093 */ 2094 os_memcpy(sm->PMK, pmk, PMK_LEN); 2095 } 2096 2097 sm->MICVerified = TRUE; 2098 2099 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 2100 sm->PTK_valid = TRUE; 2101 } 2102 2103 2104 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) 2105 { 2106 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); 2107 sm->TimeoutCtr = 0; 2108 } 2109 2110 2111 #ifdef CONFIG_IEEE80211W 2112 2113 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 2114 { 2115 if (sm->mgmt_frame_prot) { 2116 size_t len; 2117 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2118 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len; 2119 } 2120 2121 return 0; 2122 } 2123 2124 2125 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 2126 { 2127 struct wpa_igtk_kde igtk; 2128 struct wpa_group *gsm = sm->group; 2129 u8 rsc[WPA_KEY_RSC_LEN]; 2130 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2131 2132 if (!sm->mgmt_frame_prot) 2133 return pos; 2134 2135 igtk.keyid[0] = gsm->GN_igtk; 2136 igtk.keyid[1] = 0; 2137 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || 2138 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0) 2139 os_memset(igtk.pn, 0, sizeof(igtk.pn)); 2140 else 2141 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn)); 2142 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len); 2143 if (sm->wpa_auth->conf.disable_gtk) { 2144 /* 2145 * Provide unique random IGTK to each STA to prevent use of 2146 * IGTK in the BSS. 2147 */ 2148 if (random_get_bytes(igtk.igtk, len) < 0) 2149 return pos; 2150 } 2151 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, 2152 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len, 2153 NULL, 0); 2154 2155 return pos; 2156 } 2157 2158 #else /* CONFIG_IEEE80211W */ 2159 2160 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 2161 { 2162 return 0; 2163 } 2164 2165 2166 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 2167 { 2168 return pos; 2169 } 2170 2171 #endif /* CONFIG_IEEE80211W */ 2172 2173 2174 SM_STATE(WPA_PTK, PTKINITNEGOTIATING) 2175 { 2176 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; 2177 size_t gtk_len, kde_len; 2178 struct wpa_group *gsm = sm->group; 2179 u8 *wpa_ie; 2180 int wpa_ie_len, secure, keyidx, encr = 0; 2181 2182 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); 2183 sm->TimeoutEvt = FALSE; 2184 2185 sm->TimeoutCtr++; 2186 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 2187 /* No point in sending the EAPOL-Key - we will disconnect 2188 * immediately following this. */ 2189 return; 2190 } 2191 2192 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], 2193 GTK[GN], IGTK, [FTIE], [TIE * 2]) 2194 */ 2195 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2196 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2197 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ 2198 wpa_ie = sm->wpa_auth->wpa_ie; 2199 wpa_ie_len = sm->wpa_auth->wpa_ie_len; 2200 if (sm->wpa == WPA_VERSION_WPA && 2201 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && 2202 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { 2203 /* WPA-only STA, remove RSN IE and possible MDIE */ 2204 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2205 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN) 2206 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2207 wpa_ie_len = wpa_ie[1] + 2; 2208 } 2209 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2210 "sending 3/4 msg of 4-Way Handshake"); 2211 if (sm->wpa == WPA_VERSION_WPA2) { 2212 /* WPA2 send GTK in the 4-way handshake */ 2213 secure = 1; 2214 gtk = gsm->GTK[gsm->GN - 1]; 2215 gtk_len = gsm->GTK_len; 2216 if (sm->wpa_auth->conf.disable_gtk) { 2217 /* 2218 * Provide unique random GTK to each STA to prevent use 2219 * of GTK in the BSS. 2220 */ 2221 if (random_get_bytes(dummy_gtk, gtk_len) < 0) 2222 return; 2223 gtk = dummy_gtk; 2224 } 2225 keyidx = gsm->GN; 2226 _rsc = rsc; 2227 encr = 1; 2228 } else { 2229 /* WPA does not include GTK in msg 3/4 */ 2230 secure = 0; 2231 gtk = NULL; 2232 gtk_len = 0; 2233 keyidx = 0; 2234 _rsc = NULL; 2235 if (sm->rx_eapol_key_secure) { 2236 /* 2237 * It looks like Windows 7 supplicant tries to use 2238 * Secure bit in msg 2/4 after having reported Michael 2239 * MIC failure and it then rejects the 4-way handshake 2240 * if msg 3/4 does not set Secure bit. Work around this 2241 * by setting the Secure bit here even in the case of 2242 * WPA if the supplicant used it first. 2243 */ 2244 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2245 "STA used Secure bit in WPA msg 2/4 - " 2246 "set Secure for 3/4 as workaround"); 2247 secure = 1; 2248 } 2249 } 2250 2251 kde_len = wpa_ie_len + ieee80211w_kde_len(sm); 2252 if (gtk) 2253 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; 2254 #ifdef CONFIG_IEEE80211R 2255 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2256 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ 2257 kde_len += 300; /* FTIE + 2 * TIE */ 2258 } 2259 #endif /* CONFIG_IEEE80211R */ 2260 #ifdef CONFIG_P2P 2261 if (WPA_GET_BE32(sm->ip_addr) > 0) 2262 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4; 2263 #endif /* CONFIG_P2P */ 2264 kde = os_malloc(kde_len); 2265 if (kde == NULL) 2266 return; 2267 2268 pos = kde; 2269 os_memcpy(pos, wpa_ie, wpa_ie_len); 2270 pos += wpa_ie_len; 2271 #ifdef CONFIG_IEEE80211R 2272 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2273 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); 2274 if (res < 0) { 2275 wpa_printf(MSG_ERROR, "FT: Failed to insert " 2276 "PMKR1Name into RSN IE in EAPOL-Key data"); 2277 os_free(kde); 2278 return; 2279 } 2280 pos += res; 2281 } 2282 #endif /* CONFIG_IEEE80211R */ 2283 if (gtk) { 2284 u8 hdr[2]; 2285 hdr[0] = keyidx & 0x03; 2286 hdr[1] = 0; 2287 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2288 gtk, gtk_len); 2289 } 2290 pos = ieee80211w_kde_add(sm, pos); 2291 2292 #ifdef CONFIG_IEEE80211R 2293 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2294 int res; 2295 struct wpa_auth_config *conf; 2296 2297 conf = &sm->wpa_auth->conf; 2298 res = wpa_write_ftie(conf, conf->r0_key_holder, 2299 conf->r0_key_holder_len, 2300 NULL, NULL, pos, kde + kde_len - pos, 2301 NULL, 0); 2302 if (res < 0) { 2303 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " 2304 "into EAPOL-Key Key Data"); 2305 os_free(kde); 2306 return; 2307 } 2308 pos += res; 2309 2310 /* TIE[ReassociationDeadline] (TU) */ 2311 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2312 *pos++ = 5; 2313 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; 2314 WPA_PUT_LE32(pos, conf->reassociation_deadline); 2315 pos += 4; 2316 2317 /* TIE[KeyLifetime] (seconds) */ 2318 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2319 *pos++ = 5; 2320 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; 2321 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); 2322 pos += 4; 2323 } 2324 #endif /* CONFIG_IEEE80211R */ 2325 #ifdef CONFIG_P2P 2326 if (WPA_GET_BE32(sm->ip_addr) > 0) { 2327 u8 addr[3 * 4]; 2328 os_memcpy(addr, sm->ip_addr, 4); 2329 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4); 2330 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4); 2331 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC, 2332 addr, sizeof(addr), NULL, 0); 2333 } 2334 #endif /* CONFIG_P2P */ 2335 2336 wpa_send_eapol(sm->wpa_auth, sm, 2337 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | 2338 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | 2339 WPA_KEY_INFO_KEY_TYPE, 2340 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); 2341 os_free(kde); 2342 } 2343 2344 2345 SM_STATE(WPA_PTK, PTKINITDONE) 2346 { 2347 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); 2348 sm->EAPOLKeyReceived = FALSE; 2349 if (sm->Pair) { 2350 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); 2351 int klen = wpa_cipher_key_len(sm->pairwise); 2352 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 2353 sm->PTK.tk, klen)) { 2354 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 2355 return; 2356 } 2357 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 2358 sm->pairwise_set = TRUE; 2359 2360 if (sm->wpa_auth->conf.wpa_ptk_rekey) { 2361 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 2362 eloop_register_timeout(sm->wpa_auth->conf. 2363 wpa_ptk_rekey, 0, wpa_rekey_ptk, 2364 sm->wpa_auth, sm); 2365 } 2366 2367 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2368 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2369 WPA_EAPOL_authorized, 1); 2370 } 2371 } 2372 2373 if (0 /* IBSS == TRUE */) { 2374 sm->keycount++; 2375 if (sm->keycount == 2) { 2376 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2377 WPA_EAPOL_portValid, 1); 2378 } 2379 } else { 2380 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 2381 1); 2382 } 2383 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); 2384 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); 2385 if (sm->wpa == WPA_VERSION_WPA) 2386 sm->PInitAKeys = TRUE; 2387 else 2388 sm->has_GTK = TRUE; 2389 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2390 "pairwise key handshake completed (%s)", 2391 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2392 2393 #ifdef CONFIG_IEEE80211R 2394 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); 2395 #endif /* CONFIG_IEEE80211R */ 2396 } 2397 2398 2399 SM_STEP(WPA_PTK) 2400 { 2401 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 2402 2403 if (sm->Init) 2404 SM_ENTER(WPA_PTK, INITIALIZE); 2405 else if (sm->Disconnect 2406 /* || FIX: dot11RSNAConfigSALifetime timeout */) { 2407 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 2408 "WPA_PTK: sm->Disconnect"); 2409 SM_ENTER(WPA_PTK, DISCONNECT); 2410 } 2411 else if (sm->DeauthenticationRequest) 2412 SM_ENTER(WPA_PTK, DISCONNECTED); 2413 else if (sm->AuthenticationRequest) 2414 SM_ENTER(WPA_PTK, AUTHENTICATION); 2415 else if (sm->ReAuthenticationRequest) 2416 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2417 else if (sm->PTKRequest) 2418 SM_ENTER(WPA_PTK, PTKSTART); 2419 else switch (sm->wpa_ptk_state) { 2420 case WPA_PTK_INITIALIZE: 2421 break; 2422 case WPA_PTK_DISCONNECT: 2423 SM_ENTER(WPA_PTK, DISCONNECTED); 2424 break; 2425 case WPA_PTK_DISCONNECTED: 2426 SM_ENTER(WPA_PTK, INITIALIZE); 2427 break; 2428 case WPA_PTK_AUTHENTICATION: 2429 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2430 break; 2431 case WPA_PTK_AUTHENTICATION2: 2432 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 2433 wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2434 WPA_EAPOL_keyRun) > 0) 2435 SM_ENTER(WPA_PTK, INITPMK); 2436 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) 2437 /* FIX: && 802.1X::keyRun */) 2438 SM_ENTER(WPA_PTK, INITPSK); 2439 break; 2440 case WPA_PTK_INITPMK: 2441 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2442 WPA_EAPOL_keyAvailable) > 0) 2443 SM_ENTER(WPA_PTK, PTKSTART); 2444 else { 2445 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2446 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2447 "INITPMK - keyAvailable = false"); 2448 SM_ENTER(WPA_PTK, DISCONNECT); 2449 } 2450 break; 2451 case WPA_PTK_INITPSK: 2452 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, 2453 NULL)) 2454 SM_ENTER(WPA_PTK, PTKSTART); 2455 else { 2456 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2457 "no PSK configured for the STA"); 2458 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2459 SM_ENTER(WPA_PTK, DISCONNECT); 2460 } 2461 break; 2462 case WPA_PTK_PTKSTART: 2463 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2464 sm->EAPOLKeyPairwise) 2465 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2466 else if (sm->TimeoutCtr > 2467 (int) dot11RSNAConfigPairwiseUpdateCount) { 2468 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2469 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2470 "PTKSTART: Retry limit %d reached", 2471 dot11RSNAConfigPairwiseUpdateCount); 2472 SM_ENTER(WPA_PTK, DISCONNECT); 2473 } else if (sm->TimeoutEvt) 2474 SM_ENTER(WPA_PTK, PTKSTART); 2475 break; 2476 case WPA_PTK_PTKCALCNEGOTIATING: 2477 if (sm->MICVerified) 2478 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); 2479 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2480 sm->EAPOLKeyPairwise) 2481 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2482 else if (sm->TimeoutEvt) 2483 SM_ENTER(WPA_PTK, PTKSTART); 2484 break; 2485 case WPA_PTK_PTKCALCNEGOTIATING2: 2486 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2487 break; 2488 case WPA_PTK_PTKINITNEGOTIATING: 2489 if (sm->update_snonce) 2490 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2491 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2492 sm->EAPOLKeyPairwise && sm->MICVerified) 2493 SM_ENTER(WPA_PTK, PTKINITDONE); 2494 else if (sm->TimeoutCtr > 2495 (int) dot11RSNAConfigPairwiseUpdateCount) { 2496 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2497 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2498 "PTKINITNEGOTIATING: Retry limit %d " 2499 "reached", 2500 dot11RSNAConfigPairwiseUpdateCount); 2501 SM_ENTER(WPA_PTK, DISCONNECT); 2502 } else if (sm->TimeoutEvt) 2503 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2504 break; 2505 case WPA_PTK_PTKINITDONE: 2506 break; 2507 } 2508 } 2509 2510 2511 SM_STATE(WPA_PTK_GROUP, IDLE) 2512 { 2513 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); 2514 if (sm->Init) { 2515 /* Init flag is not cleared here, so avoid busy 2516 * loop by claiming nothing changed. */ 2517 sm->changed = FALSE; 2518 } 2519 sm->GTimeoutCtr = 0; 2520 } 2521 2522 2523 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) 2524 { 2525 u8 rsc[WPA_KEY_RSC_LEN]; 2526 struct wpa_group *gsm = sm->group; 2527 const u8 *kde; 2528 u8 *kde_buf = NULL, *pos, hdr[2]; 2529 size_t kde_len; 2530 u8 *gtk, dummy_gtk[32]; 2531 2532 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); 2533 2534 sm->GTimeoutCtr++; 2535 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { 2536 /* No point in sending the EAPOL-Key - we will disconnect 2537 * immediately following this. */ 2538 return; 2539 } 2540 2541 if (sm->wpa == WPA_VERSION_WPA) 2542 sm->PInitAKeys = FALSE; 2543 sm->TimeoutEvt = FALSE; 2544 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ 2545 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2546 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) 2547 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2548 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2549 "sending 1/2 msg of Group Key Handshake"); 2550 2551 gtk = gsm->GTK[gsm->GN - 1]; 2552 if (sm->wpa_auth->conf.disable_gtk) { 2553 /* 2554 * Provide unique random GTK to each STA to prevent use 2555 * of GTK in the BSS. 2556 */ 2557 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) 2558 return; 2559 gtk = dummy_gtk; 2560 } 2561 if (sm->wpa == WPA_VERSION_WPA2) { 2562 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + 2563 ieee80211w_kde_len(sm); 2564 kde_buf = os_malloc(kde_len); 2565 if (kde_buf == NULL) 2566 return; 2567 2568 kde = pos = kde_buf; 2569 hdr[0] = gsm->GN & 0x03; 2570 hdr[1] = 0; 2571 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2572 gtk, gsm->GTK_len); 2573 pos = ieee80211w_kde_add(sm, pos); 2574 kde_len = pos - kde; 2575 } else { 2576 kde = gtk; 2577 kde_len = gsm->GTK_len; 2578 } 2579 2580 wpa_send_eapol(sm->wpa_auth, sm, 2581 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | 2582 WPA_KEY_INFO_ACK | 2583 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), 2584 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1); 2585 2586 os_free(kde_buf); 2587 } 2588 2589 2590 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) 2591 { 2592 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); 2593 sm->EAPOLKeyReceived = FALSE; 2594 if (sm->GUpdateStationKeys) 2595 sm->group->GKeyDoneStations--; 2596 sm->GUpdateStationKeys = FALSE; 2597 sm->GTimeoutCtr = 0; 2598 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ 2599 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2600 "group key handshake completed (%s)", 2601 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2602 sm->has_GTK = TRUE; 2603 } 2604 2605 2606 SM_STATE(WPA_PTK_GROUP, KEYERROR) 2607 { 2608 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); 2609 if (sm->GUpdateStationKeys) 2610 sm->group->GKeyDoneStations--; 2611 sm->GUpdateStationKeys = FALSE; 2612 sm->Disconnect = TRUE; 2613 } 2614 2615 2616 SM_STEP(WPA_PTK_GROUP) 2617 { 2618 if (sm->Init || sm->PtkGroupInit) { 2619 SM_ENTER(WPA_PTK_GROUP, IDLE); 2620 sm->PtkGroupInit = FALSE; 2621 } else switch (sm->wpa_ptk_group_state) { 2622 case WPA_PTK_GROUP_IDLE: 2623 if (sm->GUpdateStationKeys || 2624 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) 2625 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2626 break; 2627 case WPA_PTK_GROUP_REKEYNEGOTIATING: 2628 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2629 !sm->EAPOLKeyPairwise && sm->MICVerified) 2630 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); 2631 else if (sm->GTimeoutCtr > 2632 (int) dot11RSNAConfigGroupUpdateCount) 2633 SM_ENTER(WPA_PTK_GROUP, KEYERROR); 2634 else if (sm->TimeoutEvt) 2635 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2636 break; 2637 case WPA_PTK_GROUP_KEYERROR: 2638 SM_ENTER(WPA_PTK_GROUP, IDLE); 2639 break; 2640 case WPA_PTK_GROUP_REKEYESTABLISHED: 2641 SM_ENTER(WPA_PTK_GROUP, IDLE); 2642 break; 2643 } 2644 } 2645 2646 2647 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 2648 struct wpa_group *group) 2649 { 2650 int ret = 0; 2651 2652 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2653 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2654 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", 2655 wpa_auth->addr, group->GNonce, 2656 group->GTK[group->GN - 1], group->GTK_len) < 0) 2657 ret = -1; 2658 wpa_hexdump_key(MSG_DEBUG, "GTK", 2659 group->GTK[group->GN - 1], group->GTK_len); 2660 2661 #ifdef CONFIG_IEEE80211W 2662 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2663 size_t len; 2664 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2665 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2666 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2667 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", 2668 wpa_auth->addr, group->GNonce, 2669 group->IGTK[group->GN_igtk - 4], len) < 0) 2670 ret = -1; 2671 wpa_hexdump_key(MSG_DEBUG, "IGTK", 2672 group->IGTK[group->GN_igtk - 4], len); 2673 } 2674 #endif /* CONFIG_IEEE80211W */ 2675 2676 return ret; 2677 } 2678 2679 2680 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, 2681 struct wpa_group *group) 2682 { 2683 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2684 "GTK_INIT (VLAN-ID %d)", group->vlan_id); 2685 group->changed = FALSE; /* GInit is not cleared here; avoid loop */ 2686 group->wpa_group_state = WPA_GROUP_GTK_INIT; 2687 2688 /* GTK[0..N] = 0 */ 2689 os_memset(group->GTK, 0, sizeof(group->GTK)); 2690 group->GN = 1; 2691 group->GM = 2; 2692 #ifdef CONFIG_IEEE80211W 2693 group->GN_igtk = 4; 2694 group->GM_igtk = 5; 2695 #endif /* CONFIG_IEEE80211W */ 2696 /* GTK[GN] = CalcGTK() */ 2697 wpa_gtk_update(wpa_auth, group); 2698 } 2699 2700 2701 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) 2702 { 2703 if (ctx != NULL && ctx != sm->group) 2704 return 0; 2705 2706 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { 2707 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2708 "Not in PTKINITDONE; skip Group Key update"); 2709 sm->GUpdateStationKeys = FALSE; 2710 return 0; 2711 } 2712 if (sm->GUpdateStationKeys) { 2713 /* 2714 * This should not really happen, so add a debug log entry. 2715 * Since we clear the GKeyDoneStations before the loop, the 2716 * station needs to be counted here anyway. 2717 */ 2718 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2719 "GUpdateStationKeys was already set when " 2720 "marking station for GTK rekeying"); 2721 } 2722 2723 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ 2724 if (sm->is_wnmsleep) 2725 return 0; 2726 2727 sm->group->GKeyDoneStations++; 2728 sm->GUpdateStationKeys = TRUE; 2729 2730 wpa_sm_step(sm); 2731 return 0; 2732 } 2733 2734 2735 #ifdef CONFIG_WNM 2736 /* update GTK when exiting WNM-Sleep Mode */ 2737 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) 2738 { 2739 if (sm == NULL || sm->is_wnmsleep) 2740 return; 2741 2742 wpa_group_update_sta(sm, NULL); 2743 } 2744 2745 2746 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) 2747 { 2748 if (sm) 2749 sm->is_wnmsleep = !!flag; 2750 } 2751 2752 2753 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2754 { 2755 struct wpa_group *gsm = sm->group; 2756 u8 *start = pos; 2757 2758 /* 2759 * GTK subelement: 2760 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 2761 * Key[5..32] 2762 */ 2763 *pos++ = WNM_SLEEP_SUBELEM_GTK; 2764 *pos++ = 11 + gsm->GTK_len; 2765 /* Key ID in B0-B1 of Key Info */ 2766 WPA_PUT_LE16(pos, gsm->GN & 0x03); 2767 pos += 2; 2768 *pos++ = gsm->GTK_len; 2769 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) 2770 return 0; 2771 pos += 8; 2772 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2773 pos += gsm->GTK_len; 2774 2775 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", 2776 gsm->GN); 2777 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", 2778 gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2779 2780 return pos - start; 2781 } 2782 2783 2784 #ifdef CONFIG_IEEE80211W 2785 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2786 { 2787 struct wpa_group *gsm = sm->group; 2788 u8 *start = pos; 2789 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2790 2791 /* 2792 * IGTK subelement: 2793 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] 2794 */ 2795 *pos++ = WNM_SLEEP_SUBELEM_IGTK; 2796 *pos++ = 2 + 6 + len; 2797 WPA_PUT_LE16(pos, gsm->GN_igtk); 2798 pos += 2; 2799 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) 2800 return 0; 2801 pos += 6; 2802 2803 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len); 2804 pos += len; 2805 2806 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", 2807 gsm->GN_igtk); 2808 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", 2809 gsm->IGTK[gsm->GN_igtk - 4], len); 2810 2811 return pos - start; 2812 } 2813 #endif /* CONFIG_IEEE80211W */ 2814 #endif /* CONFIG_WNM */ 2815 2816 2817 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, 2818 struct wpa_group *group) 2819 { 2820 int tmp; 2821 2822 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2823 "SETKEYS (VLAN-ID %d)", group->vlan_id); 2824 group->changed = TRUE; 2825 group->wpa_group_state = WPA_GROUP_SETKEYS; 2826 group->GTKReKey = FALSE; 2827 tmp = group->GM; 2828 group->GM = group->GN; 2829 group->GN = tmp; 2830 #ifdef CONFIG_IEEE80211W 2831 tmp = group->GM_igtk; 2832 group->GM_igtk = group->GN_igtk; 2833 group->GN_igtk = tmp; 2834 #endif /* CONFIG_IEEE80211W */ 2835 /* "GKeyDoneStations = GNoStations" is done in more robust way by 2836 * counting the STAs that are marked with GUpdateStationKeys instead of 2837 * including all STAs that could be in not-yet-completed state. */ 2838 wpa_gtk_update(wpa_auth, group); 2839 2840 if (group->GKeyDoneStations) { 2841 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " 2842 "GKeyDoneStations=%d when starting new GTK rekey", 2843 group->GKeyDoneStations); 2844 group->GKeyDoneStations = 0; 2845 } 2846 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); 2847 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", 2848 group->GKeyDoneStations); 2849 } 2850 2851 2852 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 2853 struct wpa_group *group) 2854 { 2855 int ret = 0; 2856 2857 if (wpa_auth_set_key(wpa_auth, group->vlan_id, 2858 wpa_cipher_to_alg(wpa_auth->conf.wpa_group), 2859 broadcast_ether_addr, group->GN, 2860 group->GTK[group->GN - 1], group->GTK_len) < 0) 2861 ret = -1; 2862 2863 #ifdef CONFIG_IEEE80211W 2864 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2865 enum wpa_alg alg; 2866 size_t len; 2867 2868 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher); 2869 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2870 2871 if (ret == 0 && 2872 wpa_auth_set_key(wpa_auth, group->vlan_id, alg, 2873 broadcast_ether_addr, group->GN_igtk, 2874 group->IGTK[group->GN_igtk - 4], len) < 0) 2875 ret = -1; 2876 } 2877 #endif /* CONFIG_IEEE80211W */ 2878 2879 return ret; 2880 } 2881 2882 2883 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx) 2884 { 2885 if (sm->group == ctx) { 2886 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR 2887 " for discconnection due to fatal failure", 2888 MAC2STR(sm->addr)); 2889 sm->Disconnect = TRUE; 2890 } 2891 2892 return 0; 2893 } 2894 2895 2896 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth, 2897 struct wpa_group *group) 2898 { 2899 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE"); 2900 group->changed = TRUE; 2901 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE; 2902 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group); 2903 } 2904 2905 2906 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, 2907 struct wpa_group *group) 2908 { 2909 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2910 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); 2911 group->changed = TRUE; 2912 group->wpa_group_state = WPA_GROUP_SETKEYSDONE; 2913 2914 if (wpa_group_config_group_keys(wpa_auth, group) < 0) { 2915 wpa_group_fatal_failure(wpa_auth, group); 2916 return -1; 2917 } 2918 2919 return 0; 2920 } 2921 2922 2923 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 2924 struct wpa_group *group) 2925 { 2926 if (group->GInit) { 2927 wpa_group_gtk_init(wpa_auth, group); 2928 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) { 2929 /* Do not allow group operations */ 2930 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && 2931 group->GTKAuthenticator) { 2932 wpa_group_setkeysdone(wpa_auth, group); 2933 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && 2934 group->GTKReKey) { 2935 wpa_group_setkeys(wpa_auth, group); 2936 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { 2937 if (group->GKeyDoneStations == 0) 2938 wpa_group_setkeysdone(wpa_auth, group); 2939 else if (group->GTKReKey) 2940 wpa_group_setkeys(wpa_auth, group); 2941 } 2942 } 2943 2944 2945 static int wpa_sm_step(struct wpa_state_machine *sm) 2946 { 2947 if (sm == NULL) 2948 return 0; 2949 2950 if (sm->in_step_loop) { 2951 /* This should not happen, but if it does, make sure we do not 2952 * end up freeing the state machine too early by exiting the 2953 * recursive call. */ 2954 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); 2955 return 0; 2956 } 2957 2958 sm->in_step_loop = 1; 2959 do { 2960 if (sm->pending_deinit) 2961 break; 2962 2963 sm->changed = FALSE; 2964 sm->wpa_auth->group->changed = FALSE; 2965 2966 SM_STEP_RUN(WPA_PTK); 2967 if (sm->pending_deinit) 2968 break; 2969 SM_STEP_RUN(WPA_PTK_GROUP); 2970 if (sm->pending_deinit) 2971 break; 2972 wpa_group_sm_step(sm->wpa_auth, sm->group); 2973 } while (sm->changed || sm->wpa_auth->group->changed); 2974 sm->in_step_loop = 0; 2975 2976 if (sm->pending_deinit) { 2977 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " 2978 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 2979 wpa_free_sta_sm(sm); 2980 return 1; 2981 } 2982 return 0; 2983 } 2984 2985 2986 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) 2987 { 2988 struct wpa_state_machine *sm = eloop_ctx; 2989 wpa_sm_step(sm); 2990 } 2991 2992 2993 void wpa_auth_sm_notify(struct wpa_state_machine *sm) 2994 { 2995 if (sm == NULL) 2996 return; 2997 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); 2998 } 2999 3000 3001 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) 3002 { 3003 int tmp, i; 3004 struct wpa_group *group; 3005 3006 if (wpa_auth == NULL) 3007 return; 3008 3009 group = wpa_auth->group; 3010 3011 for (i = 0; i < 2; i++) { 3012 tmp = group->GM; 3013 group->GM = group->GN; 3014 group->GN = tmp; 3015 #ifdef CONFIG_IEEE80211W 3016 tmp = group->GM_igtk; 3017 group->GM_igtk = group->GN_igtk; 3018 group->GN_igtk = tmp; 3019 #endif /* CONFIG_IEEE80211W */ 3020 wpa_gtk_update(wpa_auth, group); 3021 wpa_group_config_group_keys(wpa_auth, group); 3022 } 3023 } 3024 3025 3026 static const char * wpa_bool_txt(int val) 3027 { 3028 return val ? "TRUE" : "FALSE"; 3029 } 3030 3031 3032 #define RSN_SUITE "%02x-%02x-%02x-%d" 3033 #define RSN_SUITE_ARG(s) \ 3034 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 3035 3036 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) 3037 { 3038 int len = 0, ret; 3039 char pmkid_txt[PMKID_LEN * 2 + 1]; 3040 #ifdef CONFIG_RSN_PREAUTH 3041 const int preauth = 1; 3042 #else /* CONFIG_RSN_PREAUTH */ 3043 const int preauth = 0; 3044 #endif /* CONFIG_RSN_PREAUTH */ 3045 3046 if (wpa_auth == NULL) 3047 return len; 3048 3049 ret = os_snprintf(buf + len, buflen - len, 3050 "dot11RSNAOptionImplemented=TRUE\n" 3051 "dot11RSNAPreauthenticationImplemented=%s\n" 3052 "dot11RSNAEnabled=%s\n" 3053 "dot11RSNAPreauthenticationEnabled=%s\n", 3054 wpa_bool_txt(preauth), 3055 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), 3056 wpa_bool_txt(wpa_auth->conf.rsn_preauth)); 3057 if (os_snprintf_error(buflen - len, ret)) 3058 return len; 3059 len += ret; 3060 3061 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 3062 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); 3063 3064 ret = os_snprintf( 3065 buf + len, buflen - len, 3066 "dot11RSNAConfigVersion=%u\n" 3067 "dot11RSNAConfigPairwiseKeysSupported=9999\n" 3068 /* FIX: dot11RSNAConfigGroupCipher */ 3069 /* FIX: dot11RSNAConfigGroupRekeyMethod */ 3070 /* FIX: dot11RSNAConfigGroupRekeyTime */ 3071 /* FIX: dot11RSNAConfigGroupRekeyPackets */ 3072 "dot11RSNAConfigGroupRekeyStrict=%u\n" 3073 "dot11RSNAConfigGroupUpdateCount=%u\n" 3074 "dot11RSNAConfigPairwiseUpdateCount=%u\n" 3075 "dot11RSNAConfigGroupCipherSize=%u\n" 3076 "dot11RSNAConfigPMKLifetime=%u\n" 3077 "dot11RSNAConfigPMKReauthThreshold=%u\n" 3078 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" 3079 "dot11RSNAConfigSATimeout=%u\n" 3080 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 3081 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 3082 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 3083 "dot11RSNAPMKIDUsed=%s\n" 3084 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 3085 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 3086 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 3087 "dot11RSNATKIPCounterMeasuresInvoked=%u\n" 3088 "dot11RSNA4WayHandshakeFailures=%u\n" 3089 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", 3090 RSN_VERSION, 3091 !!wpa_auth->conf.wpa_strict_rekey, 3092 dot11RSNAConfigGroupUpdateCount, 3093 dot11RSNAConfigPairwiseUpdateCount, 3094 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, 3095 dot11RSNAConfigPMKLifetime, 3096 dot11RSNAConfigPMKReauthThreshold, 3097 dot11RSNAConfigSATimeout, 3098 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), 3099 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), 3100 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), 3101 pmkid_txt, 3102 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), 3103 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), 3104 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), 3105 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, 3106 wpa_auth->dot11RSNA4WayHandshakeFailures); 3107 if (os_snprintf_error(buflen - len, ret)) 3108 return len; 3109 len += ret; 3110 3111 /* TODO: dot11RSNAConfigPairwiseCiphersTable */ 3112 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ 3113 3114 /* Private MIB */ 3115 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", 3116 wpa_auth->group->wpa_group_state); 3117 if (os_snprintf_error(buflen - len, ret)) 3118 return len; 3119 len += ret; 3120 3121 return len; 3122 } 3123 3124 3125 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) 3126 { 3127 int len = 0, ret; 3128 u32 pairwise = 0; 3129 3130 if (sm == NULL) 3131 return 0; 3132 3133 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ 3134 3135 /* dot11RSNAStatsEntry */ 3136 3137 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? 3138 WPA_PROTO_RSN : WPA_PROTO_WPA, 3139 sm->pairwise); 3140 if (pairwise == 0) 3141 return 0; 3142 3143 ret = os_snprintf( 3144 buf + len, buflen - len, 3145 /* TODO: dot11RSNAStatsIndex */ 3146 "dot11RSNAStatsSTAAddress=" MACSTR "\n" 3147 "dot11RSNAStatsVersion=1\n" 3148 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" 3149 /* TODO: dot11RSNAStatsTKIPICVErrors */ 3150 "dot11RSNAStatsTKIPLocalMICFailures=%u\n" 3151 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" 3152 /* TODO: dot11RSNAStatsCCMPReplays */ 3153 /* TODO: dot11RSNAStatsCCMPDecryptErrors */ 3154 /* TODO: dot11RSNAStatsTKIPReplays */, 3155 MAC2STR(sm->addr), 3156 RSN_SUITE_ARG(pairwise), 3157 sm->dot11RSNAStatsTKIPLocalMICFailures, 3158 sm->dot11RSNAStatsTKIPRemoteMICFailures); 3159 if (os_snprintf_error(buflen - len, ret)) 3160 return len; 3161 len += ret; 3162 3163 /* Private MIB */ 3164 ret = os_snprintf(buf + len, buflen - len, 3165 "hostapdWPAPTKState=%d\n" 3166 "hostapdWPAPTKGroupState=%d\n", 3167 sm->wpa_ptk_state, 3168 sm->wpa_ptk_group_state); 3169 if (os_snprintf_error(buflen - len, ret)) 3170 return len; 3171 len += ret; 3172 3173 return len; 3174 } 3175 3176 3177 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) 3178 { 3179 if (wpa_auth) 3180 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; 3181 } 3182 3183 3184 int wpa_auth_pairwise_set(struct wpa_state_machine *sm) 3185 { 3186 return sm && sm->pairwise_set; 3187 } 3188 3189 3190 int wpa_auth_get_pairwise(struct wpa_state_machine *sm) 3191 { 3192 return sm->pairwise; 3193 } 3194 3195 3196 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) 3197 { 3198 if (sm == NULL) 3199 return -1; 3200 return sm->wpa_key_mgmt; 3201 } 3202 3203 3204 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) 3205 { 3206 if (sm == NULL) 3207 return 0; 3208 return sm->wpa; 3209 } 3210 3211 3212 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, 3213 struct rsn_pmksa_cache_entry *entry) 3214 { 3215 if (sm == NULL || sm->pmksa != entry) 3216 return -1; 3217 sm->pmksa = NULL; 3218 return 0; 3219 } 3220 3221 3222 struct rsn_pmksa_cache_entry * 3223 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) 3224 { 3225 return sm ? sm->pmksa : NULL; 3226 } 3227 3228 3229 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) 3230 { 3231 if (sm) 3232 sm->dot11RSNAStatsTKIPLocalMICFailures++; 3233 } 3234 3235 3236 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) 3237 { 3238 if (wpa_auth == NULL) 3239 return NULL; 3240 *len = wpa_auth->wpa_ie_len; 3241 return wpa_auth->wpa_ie; 3242 } 3243 3244 3245 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, 3246 int session_timeout, struct eapol_state_machine *eapol) 3247 { 3248 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || 3249 sm->wpa_auth->conf.disable_pmksa_caching) 3250 return -1; 3251 3252 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, 3253 sm->PTK.kck, sm->PTK.kck_len, 3254 sm->wpa_auth->addr, sm->addr, session_timeout, 3255 eapol, sm->wpa_key_mgmt)) 3256 return 0; 3257 3258 return -1; 3259 } 3260 3261 3262 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, 3263 const u8 *pmk, size_t len, const u8 *sta_addr, 3264 int session_timeout, 3265 struct eapol_state_machine *eapol) 3266 { 3267 if (wpa_auth == NULL) 3268 return -1; 3269 3270 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, 3271 NULL, 0, 3272 wpa_auth->addr, 3273 sta_addr, session_timeout, eapol, 3274 WPA_KEY_MGMT_IEEE8021X)) 3275 return 0; 3276 3277 return -1; 3278 } 3279 3280 3281 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr, 3282 const u8 *pmk) 3283 { 3284 if (wpa_auth->conf.disable_pmksa_caching) 3285 return -1; 3286 3287 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, 3288 NULL, 0, 3289 wpa_auth->addr, addr, 0, NULL, 3290 WPA_KEY_MGMT_SAE)) 3291 return 0; 3292 3293 return -1; 3294 } 3295 3296 3297 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth, 3298 const u8 *sta_addr) 3299 { 3300 struct rsn_pmksa_cache_entry *pmksa; 3301 3302 if (wpa_auth == NULL || wpa_auth->pmksa == NULL) 3303 return; 3304 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL); 3305 if (pmksa) { 3306 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for " 3307 MACSTR " based on request", MAC2STR(sta_addr)); 3308 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa); 3309 } 3310 } 3311 3312 3313 /* 3314 * Remove and free the group from wpa_authenticator. This is triggered by a 3315 * callback to make sure nobody is currently iterating the group list while it 3316 * gets modified. 3317 */ 3318 static void wpa_group_free(struct wpa_authenticator *wpa_auth, 3319 struct wpa_group *group) 3320 { 3321 struct wpa_group *prev = wpa_auth->group; 3322 3323 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d", 3324 group->vlan_id); 3325 3326 while (prev) { 3327 if (prev->next == group) { 3328 /* This never frees the special first group as needed */ 3329 prev->next = group->next; 3330 os_free(group); 3331 break; 3332 } 3333 prev = prev->next; 3334 } 3335 3336 } 3337 3338 3339 /* Increase the reference counter for group */ 3340 static void wpa_group_get(struct wpa_authenticator *wpa_auth, 3341 struct wpa_group *group) 3342 { 3343 /* Skip the special first group */ 3344 if (wpa_auth->group == group) 3345 return; 3346 3347 group->references++; 3348 } 3349 3350 3351 /* Decrease the reference counter and maybe free the group */ 3352 static void wpa_group_put(struct wpa_authenticator *wpa_auth, 3353 struct wpa_group *group) 3354 { 3355 /* Skip the special first group */ 3356 if (wpa_auth->group == group) 3357 return; 3358 3359 group->references--; 3360 if (group->references) 3361 return; 3362 wpa_group_free(wpa_auth, group); 3363 } 3364 3365 3366 /* 3367 * Add a group that has its references counter set to zero. Caller needs to 3368 * call wpa_group_get() on the return value to mark the entry in use. 3369 */ 3370 static struct wpa_group * 3371 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) 3372 { 3373 struct wpa_group *group; 3374 3375 if (wpa_auth == NULL || wpa_auth->group == NULL) 3376 return NULL; 3377 3378 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", 3379 vlan_id); 3380 group = wpa_group_init(wpa_auth, vlan_id, 0); 3381 if (group == NULL) 3382 return NULL; 3383 3384 group->next = wpa_auth->group->next; 3385 wpa_auth->group->next = group; 3386 3387 return group; 3388 } 3389 3390 3391 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) 3392 { 3393 struct wpa_group *group; 3394 3395 if (sm == NULL || sm->wpa_auth == NULL) 3396 return 0; 3397 3398 group = sm->wpa_auth->group; 3399 while (group) { 3400 if (group->vlan_id == vlan_id) 3401 break; 3402 group = group->next; 3403 } 3404 3405 if (group == NULL) { 3406 group = wpa_auth_add_group(sm->wpa_auth, vlan_id); 3407 if (group == NULL) 3408 return -1; 3409 } 3410 3411 if (sm->group == group) 3412 return 0; 3413 3414 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 3415 return -1; 3416 3417 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " 3418 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); 3419 3420 wpa_group_get(sm->wpa_auth, group); 3421 wpa_group_put(sm->wpa_auth, sm->group); 3422 sm->group = group; 3423 3424 return 0; 3425 } 3426 3427 3428 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, 3429 struct wpa_state_machine *sm, int ack) 3430 { 3431 if (wpa_auth == NULL || sm == NULL) 3432 return; 3433 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR 3434 " ack=%d", MAC2STR(sm->addr), ack); 3435 if (sm->pending_1_of_4_timeout && ack) { 3436 /* 3437 * Some deployed supplicant implementations update their SNonce 3438 * for each EAPOL-Key 2/4 message even within the same 4-way 3439 * handshake and then fail to use the first SNonce when 3440 * deriving the PTK. This results in unsuccessful 4-way 3441 * handshake whenever the relatively short initial timeout is 3442 * reached and EAPOL-Key 1/4 is retransmitted. Try to work 3443 * around this by increasing the timeout now that we know that 3444 * the station has received the frame. 3445 */ 3446 int timeout_ms = eapol_key_timeout_subseq; 3447 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " 3448 "timeout by %u ms because of acknowledged frame", 3449 timeout_ms); 3450 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 3451 eloop_register_timeout(timeout_ms / 1000, 3452 (timeout_ms % 1000) * 1000, 3453 wpa_send_eapol_timeout, wpa_auth, sm); 3454 } 3455 } 3456 3457 3458 int wpa_auth_uses_sae(struct wpa_state_machine *sm) 3459 { 3460 if (sm == NULL) 3461 return 0; 3462 return wpa_key_mgmt_sae(sm->wpa_key_mgmt); 3463 } 3464 3465 3466 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm) 3467 { 3468 if (sm == NULL) 3469 return 0; 3470 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE; 3471 } 3472 3473 3474 #ifdef CONFIG_P2P 3475 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr) 3476 { 3477 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0) 3478 return -1; 3479 os_memcpy(addr, sm->ip_addr, 4); 3480 return 0; 3481 } 3482 #endif /* CONFIG_P2P */ 3483 3484 3485 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth, 3486 struct radius_das_attrs *attr) 3487 { 3488 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr); 3489 } 3490 3491 3492 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth) 3493 { 3494 struct wpa_group *group; 3495 3496 if (!wpa_auth) 3497 return; 3498 for (group = wpa_auth->group; group; group = group->next) 3499 wpa_group_config_group_keys(wpa_auth, group); 3500 } 3501