1 /* 2 * IEEE 802.11 RSN / WPA Authenticator 3 * Copyright (c) 2004-2015, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "utils/eloop.h" 13 #include "utils/state_machine.h" 14 #include "utils/bitfield.h" 15 #include "common/ieee802_11_defs.h" 16 #include "crypto/aes_wrap.h" 17 #include "crypto/crypto.h" 18 #include "crypto/sha1.h" 19 #include "crypto/sha256.h" 20 #include "crypto/random.h" 21 #include "eapol_auth/eapol_auth_sm.h" 22 #include "ap_config.h" 23 #include "ieee802_11.h" 24 #include "wpa_auth.h" 25 #include "pmksa_cache_auth.h" 26 #include "wpa_auth_i.h" 27 #include "wpa_auth_ie.h" 28 29 #define STATE_MACHINE_DATA struct wpa_state_machine 30 #define STATE_MACHINE_DEBUG_PREFIX "WPA" 31 #define STATE_MACHINE_ADDR sm->addr 32 33 34 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx); 35 static int wpa_sm_step(struct wpa_state_machine *sm); 36 static int wpa_verify_key_mic(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 } else if (sm->PTK.kek_len == 16) { 1544 u8 ek[32]; 1545 os_memcpy(key->key_iv, 1546 sm->group->Counter + WPA_NONCE_LEN - 16, 16); 1547 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); 1548 os_memcpy(ek, key->key_iv, 16); 1549 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len); 1550 os_memcpy(key_data, buf, key_data_len); 1551 rc4_skip(ek, 32, 256, key_data, key_data_len); 1552 if (mic_len == 24) 1553 WPA_PUT_BE16(key192->key_data_length, 1554 key_data_len); 1555 else 1556 WPA_PUT_BE16(key->key_data_length, 1557 key_data_len); 1558 } else { 1559 os_free(hdr); 1560 os_free(buf); 1561 return; 1562 } 1563 os_free(buf); 1564 } 1565 1566 if (key_info & WPA_KEY_INFO_MIC) { 1567 u8 *key_mic; 1568 1569 if (!sm->PTK_valid) { 1570 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 1571 "PTK not valid when sending EAPOL-Key " 1572 "frame"); 1573 os_free(hdr); 1574 return; 1575 } 1576 1577 key_mic = key192->key_mic; /* same offset for key and key192 */ 1578 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len, 1579 sm->wpa_key_mgmt, version, 1580 (u8 *) hdr, len, key_mic); 1581 #ifdef CONFIG_TESTING_OPTIONS 1582 if (!pairwise && 1583 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 && 1584 drand48() < 1585 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { 1586 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1587 "Corrupting group EAPOL-Key Key MIC"); 1588 key_mic[0]++; 1589 } 1590 #endif /* CONFIG_TESTING_OPTIONS */ 1591 } 1592 1593 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, 1594 1); 1595 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, 1596 sm->pairwise_set); 1597 os_free(hdr); 1598 } 1599 1600 1601 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1602 struct wpa_state_machine *sm, int key_info, 1603 const u8 *key_rsc, const u8 *nonce, 1604 const u8 *kde, size_t kde_len, 1605 int keyidx, int encr) 1606 { 1607 int timeout_ms; 1608 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; 1609 int ctr; 1610 1611 if (sm == NULL) 1612 return; 1613 1614 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, 1615 keyidx, encr, 0); 1616 1617 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; 1618 if (ctr == 1 && wpa_auth->conf.tx_status) 1619 timeout_ms = pairwise ? eapol_key_timeout_first : 1620 eapol_key_timeout_first_group; 1621 else 1622 timeout_ms = eapol_key_timeout_subseq; 1623 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) 1624 sm->pending_1_of_4_timeout = 1; 1625 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " 1626 "counter %d)", timeout_ms, ctr); 1627 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, 1628 wpa_send_eapol_timeout, wpa_auth, sm); 1629 } 1630 1631 1632 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data, 1633 size_t data_len) 1634 { 1635 struct ieee802_1x_hdr *hdr; 1636 struct wpa_eapol_key *key; 1637 struct wpa_eapol_key_192 *key192; 1638 u16 key_info; 1639 int ret = 0; 1640 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1641 size_t mic_len = wpa_mic_len(akmp); 1642 1643 if (data_len < sizeof(*hdr) + sizeof(*key)) 1644 return -1; 1645 1646 hdr = (struct ieee802_1x_hdr *) data; 1647 key = (struct wpa_eapol_key *) (hdr + 1); 1648 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 1649 key_info = WPA_GET_BE16(key->key_info); 1650 os_memcpy(mic, key192->key_mic, mic_len); 1651 os_memset(key192->key_mic, 0, mic_len); 1652 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp, 1653 key_info & WPA_KEY_INFO_TYPE_MASK, 1654 data, data_len, key192->key_mic) || 1655 os_memcmp_const(mic, key192->key_mic, mic_len) != 0) 1656 ret = -1; 1657 os_memcpy(key192->key_mic, mic, mic_len); 1658 return ret; 1659 } 1660 1661 1662 void wpa_remove_ptk(struct wpa_state_machine *sm) 1663 { 1664 sm->PTK_valid = FALSE; 1665 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1666 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); 1667 sm->pairwise_set = FALSE; 1668 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 1669 } 1670 1671 1672 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event) 1673 { 1674 int remove_ptk = 1; 1675 1676 if (sm == NULL) 1677 return -1; 1678 1679 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1680 "event %d notification", event); 1681 1682 switch (event) { 1683 case WPA_AUTH: 1684 #ifdef CONFIG_MESH 1685 /* PTKs are derived through AMPE */ 1686 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) { 1687 /* not mesh */ 1688 break; 1689 } 1690 return 0; 1691 #endif /* CONFIG_MESH */ 1692 case WPA_ASSOC: 1693 break; 1694 case WPA_DEAUTH: 1695 case WPA_DISASSOC: 1696 sm->DeauthenticationRequest = TRUE; 1697 break; 1698 case WPA_REAUTH: 1699 case WPA_REAUTH_EAPOL: 1700 if (!sm->started) { 1701 /* 1702 * When using WPS, we may end up here if the STA 1703 * manages to re-associate without the previous STA 1704 * entry getting removed. Consequently, we need to make 1705 * sure that the WPA state machines gets initialized 1706 * properly at this point. 1707 */ 1708 wpa_printf(MSG_DEBUG, "WPA state machine had not been " 1709 "started - initialize now"); 1710 sm->started = 1; 1711 sm->Init = TRUE; 1712 if (wpa_sm_step(sm) == 1) 1713 return 1; /* should not really happen */ 1714 sm->Init = FALSE; 1715 sm->AuthenticationRequest = TRUE; 1716 break; 1717 } 1718 if (sm->GUpdateStationKeys) { 1719 /* 1720 * Reauthentication cancels the pending group key 1721 * update for this STA. 1722 */ 1723 sm->group->GKeyDoneStations--; 1724 sm->GUpdateStationKeys = FALSE; 1725 sm->PtkGroupInit = TRUE; 1726 } 1727 sm->ReAuthenticationRequest = TRUE; 1728 break; 1729 case WPA_ASSOC_FT: 1730 #ifdef CONFIG_IEEE80211R 1731 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " 1732 "after association"); 1733 wpa_ft_install_ptk(sm); 1734 1735 /* Using FT protocol, not WPA auth state machine */ 1736 sm->ft_completed = 1; 1737 return 0; 1738 #else /* CONFIG_IEEE80211R */ 1739 break; 1740 #endif /* CONFIG_IEEE80211R */ 1741 } 1742 1743 #ifdef CONFIG_IEEE80211R 1744 sm->ft_completed = 0; 1745 #endif /* CONFIG_IEEE80211R */ 1746 1747 #ifdef CONFIG_IEEE80211W 1748 if (sm->mgmt_frame_prot && event == WPA_AUTH) 1749 remove_ptk = 0; 1750 #endif /* CONFIG_IEEE80211W */ 1751 1752 if (remove_ptk) { 1753 sm->PTK_valid = FALSE; 1754 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1755 1756 if (event != WPA_REAUTH_EAPOL) 1757 wpa_remove_ptk(sm); 1758 } 1759 1760 return wpa_sm_step(sm); 1761 } 1762 1763 1764 SM_STATE(WPA_PTK, INITIALIZE) 1765 { 1766 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); 1767 if (sm->Init) { 1768 /* Init flag is not cleared here, so avoid busy 1769 * loop by claiming nothing changed. */ 1770 sm->changed = FALSE; 1771 } 1772 1773 sm->keycount = 0; 1774 if (sm->GUpdateStationKeys) 1775 sm->group->GKeyDoneStations--; 1776 sm->GUpdateStationKeys = FALSE; 1777 if (sm->wpa == WPA_VERSION_WPA) 1778 sm->PInitAKeys = FALSE; 1779 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and 1780 * Local AA > Remote AA)) */) { 1781 sm->Pair = TRUE; 1782 } 1783 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); 1784 wpa_remove_ptk(sm); 1785 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); 1786 sm->TimeoutCtr = 0; 1787 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1788 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 1789 WPA_EAPOL_authorized, 0); 1790 } 1791 } 1792 1793 1794 SM_STATE(WPA_PTK, DISCONNECT) 1795 { 1796 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); 1797 sm->Disconnect = FALSE; 1798 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 1799 } 1800 1801 1802 SM_STATE(WPA_PTK, DISCONNECTED) 1803 { 1804 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); 1805 sm->DeauthenticationRequest = FALSE; 1806 } 1807 1808 1809 SM_STATE(WPA_PTK, AUTHENTICATION) 1810 { 1811 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); 1812 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1813 sm->PTK_valid = FALSE; 1814 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, 1815 1); 1816 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); 1817 sm->AuthenticationRequest = FALSE; 1818 } 1819 1820 1821 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, 1822 struct wpa_group *group) 1823 { 1824 if (group->first_sta_seen) 1825 return; 1826 /* 1827 * System has run bit further than at the time hostapd was started 1828 * potentially very early during boot up. This provides better chances 1829 * of collecting more randomness on embedded systems. Re-initialize the 1830 * GMK and Counter here to improve their strength if there was not 1831 * enough entropy available immediately after system startup. 1832 */ 1833 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " 1834 "station"); 1835 if (random_pool_ready() != 1) { 1836 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 1837 "to proceed - reject first 4-way handshake"); 1838 group->reject_4way_hs_for_entropy = TRUE; 1839 } else { 1840 group->first_sta_seen = TRUE; 1841 group->reject_4way_hs_for_entropy = FALSE; 1842 } 1843 1844 wpa_group_init_gmk_and_counter(wpa_auth, group); 1845 wpa_gtk_update(wpa_auth, group); 1846 wpa_group_config_group_keys(wpa_auth, group); 1847 } 1848 1849 1850 SM_STATE(WPA_PTK, AUTHENTICATION2) 1851 { 1852 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); 1853 1854 wpa_group_ensure_init(sm->wpa_auth, sm->group); 1855 sm->ReAuthenticationRequest = FALSE; 1856 1857 /* 1858 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat 1859 * ambiguous. The Authenticator state machine uses a counter that is 1860 * incremented by one for each 4-way handshake. However, the security 1861 * analysis of 4-way handshake points out that unpredictable nonces 1862 * help in preventing precomputation attacks. Instead of the state 1863 * machine definition, use an unpredictable nonce value here to provide 1864 * stronger protection against potential precomputation attacks. 1865 */ 1866 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1867 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " 1868 "ANonce."); 1869 sm->Disconnect = TRUE; 1870 return; 1871 } 1872 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, 1873 WPA_NONCE_LEN); 1874 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more 1875 * logical place than INITIALIZE since AUTHENTICATION2 can be 1876 * re-entered on ReAuthenticationRequest without going through 1877 * INITIALIZE. */ 1878 sm->TimeoutCtr = 0; 1879 } 1880 1881 1882 SM_STATE(WPA_PTK, INITPMK) 1883 { 1884 u8 msk[2 * PMK_LEN]; 1885 size_t len = 2 * PMK_LEN; 1886 1887 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); 1888 #ifdef CONFIG_IEEE80211R 1889 sm->xxkey_len = 0; 1890 #endif /* CONFIG_IEEE80211R */ 1891 if (sm->pmksa) { 1892 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); 1893 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); 1894 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { 1895 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " 1896 "(len=%lu)", (unsigned long) len); 1897 os_memcpy(sm->PMK, msk, PMK_LEN); 1898 #ifdef CONFIG_IEEE80211R 1899 if (len >= 2 * PMK_LEN) { 1900 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); 1901 sm->xxkey_len = PMK_LEN; 1902 } 1903 #endif /* CONFIG_IEEE80211R */ 1904 } else { 1905 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p", 1906 sm->wpa_auth->cb.get_msk); 1907 sm->Disconnect = TRUE; 1908 return; 1909 } 1910 os_memset(msk, 0, sizeof(msk)); 1911 1912 sm->req_replay_counter_used = 0; 1913 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this 1914 * will break reauthentication since EAPOL state machines may not be 1915 * get into AUTHENTICATING state that clears keyRun before WPA state 1916 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK 1917 * state and takes PMK from the previously used AAA Key. This will 1918 * eventually fail in 4-Way Handshake because Supplicant uses PMK 1919 * derived from the new AAA Key. Setting keyRun = FALSE here seems to 1920 * be good workaround for this issue. */ 1921 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); 1922 } 1923 1924 1925 SM_STATE(WPA_PTK, INITPSK) 1926 { 1927 const u8 *psk; 1928 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); 1929 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL); 1930 if (psk) { 1931 os_memcpy(sm->PMK, psk, PMK_LEN); 1932 #ifdef CONFIG_IEEE80211R 1933 os_memcpy(sm->xxkey, psk, PMK_LEN); 1934 sm->xxkey_len = PMK_LEN; 1935 #endif /* CONFIG_IEEE80211R */ 1936 } 1937 sm->req_replay_counter_used = 0; 1938 } 1939 1940 1941 SM_STATE(WPA_PTK, PTKSTART) 1942 { 1943 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; 1944 size_t pmkid_len = 0; 1945 1946 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); 1947 sm->PTKRequest = FALSE; 1948 sm->TimeoutEvt = FALSE; 1949 sm->alt_snonce_valid = FALSE; 1950 1951 sm->TimeoutCtr++; 1952 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1953 /* No point in sending the EAPOL-Key - we will disconnect 1954 * immediately following this. */ 1955 return; 1956 } 1957 1958 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1959 "sending 1/4 msg of 4-Way Handshake"); 1960 /* 1961 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only 1962 * one possible PSK for this STA. 1963 */ 1964 if (sm->wpa == WPA_VERSION_WPA2 && 1965 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 1966 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) { 1967 pmkid = buf; 1968 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 1969 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; 1970 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; 1971 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); 1972 if (sm->pmksa) { 1973 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], 1974 sm->pmksa->pmkid, PMKID_LEN); 1975 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) { 1976 /* No KCK available to derive PMKID */ 1977 pmkid = NULL; 1978 } else { 1979 /* 1980 * Calculate PMKID since no PMKSA cache entry was 1981 * available with pre-calculated PMKID. 1982 */ 1983 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, 1984 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], 1985 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 1986 } 1987 } 1988 wpa_send_eapol(sm->wpa_auth, sm, 1989 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, 1990 sm->ANonce, pmkid, pmkid_len, 0, 0); 1991 } 1992 1993 1994 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce, 1995 const u8 *pmk, struct wpa_ptk *ptk) 1996 { 1997 #ifdef CONFIG_IEEE80211R 1998 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 1999 return wpa_auth_derive_ptk_ft(sm, pmk, ptk); 2000 #endif /* CONFIG_IEEE80211R */ 2001 2002 return wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", 2003 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce, 2004 ptk, sm->wpa_key_mgmt, sm->pairwise); 2005 } 2006 2007 2008 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) 2009 { 2010 struct wpa_ptk PTK; 2011 int ok = 0, psk_found = 0; 2012 const u8 *pmk = NULL; 2013 2014 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); 2015 sm->EAPOLKeyReceived = FALSE; 2016 sm->update_snonce = FALSE; 2017 2018 /* WPA with IEEE 802.1X: use the derived PMK from EAP 2019 * WPA-PSK: iterate through possible PSKs and select the one matching 2020 * the packet */ 2021 for (;;) { 2022 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2023 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 2024 sm->p2p_dev_addr, pmk); 2025 if (pmk == NULL) 2026 break; 2027 psk_found = 1; 2028 } else 2029 pmk = sm->PMK; 2030 2031 wpa_derive_ptk(sm, sm->SNonce, pmk, &PTK); 2032 2033 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, 2034 sm->last_rx_eapol_key, 2035 sm->last_rx_eapol_key_len) == 0) { 2036 ok = 1; 2037 break; 2038 } 2039 2040 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 2041 break; 2042 } 2043 2044 if (!ok) { 2045 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2046 "invalid MIC in msg 2/4 of 4-Way Handshake"); 2047 if (psk_found) 2048 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr); 2049 return; 2050 } 2051 2052 #ifdef CONFIG_IEEE80211R 2053 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2054 /* 2055 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches 2056 * with the value we derived. 2057 */ 2058 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name, 2059 WPA_PMK_NAME_LEN) != 0) { 2060 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2061 "PMKR1Name mismatch in FT 4-way " 2062 "handshake"); 2063 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " 2064 "Supplicant", 2065 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); 2066 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 2067 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 2068 return; 2069 } 2070 } 2071 #endif /* CONFIG_IEEE80211R */ 2072 2073 sm->pending_1_of_4_timeout = 0; 2074 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 2075 2076 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2077 /* PSK may have changed from the previous choice, so update 2078 * state machine data based on whatever PSK was selected here. 2079 */ 2080 os_memcpy(sm->PMK, pmk, PMK_LEN); 2081 } 2082 2083 sm->MICVerified = TRUE; 2084 2085 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 2086 sm->PTK_valid = TRUE; 2087 } 2088 2089 2090 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) 2091 { 2092 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); 2093 sm->TimeoutCtr = 0; 2094 } 2095 2096 2097 #ifdef CONFIG_IEEE80211W 2098 2099 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 2100 { 2101 if (sm->mgmt_frame_prot) { 2102 size_t len; 2103 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2104 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len; 2105 } 2106 2107 return 0; 2108 } 2109 2110 2111 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 2112 { 2113 struct wpa_igtk_kde igtk; 2114 struct wpa_group *gsm = sm->group; 2115 u8 rsc[WPA_KEY_RSC_LEN]; 2116 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2117 2118 if (!sm->mgmt_frame_prot) 2119 return pos; 2120 2121 igtk.keyid[0] = gsm->GN_igtk; 2122 igtk.keyid[1] = 0; 2123 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || 2124 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0) 2125 os_memset(igtk.pn, 0, sizeof(igtk.pn)); 2126 else 2127 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn)); 2128 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len); 2129 if (sm->wpa_auth->conf.disable_gtk) { 2130 /* 2131 * Provide unique random IGTK to each STA to prevent use of 2132 * IGTK in the BSS. 2133 */ 2134 if (random_get_bytes(igtk.igtk, len) < 0) 2135 return pos; 2136 } 2137 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, 2138 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len, 2139 NULL, 0); 2140 2141 return pos; 2142 } 2143 2144 #else /* CONFIG_IEEE80211W */ 2145 2146 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 2147 { 2148 return 0; 2149 } 2150 2151 2152 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 2153 { 2154 return pos; 2155 } 2156 2157 #endif /* CONFIG_IEEE80211W */ 2158 2159 2160 SM_STATE(WPA_PTK, PTKINITNEGOTIATING) 2161 { 2162 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; 2163 size_t gtk_len, kde_len; 2164 struct wpa_group *gsm = sm->group; 2165 u8 *wpa_ie; 2166 int wpa_ie_len, secure, keyidx, encr = 0; 2167 2168 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); 2169 sm->TimeoutEvt = FALSE; 2170 2171 sm->TimeoutCtr++; 2172 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 2173 /* No point in sending the EAPOL-Key - we will disconnect 2174 * immediately following this. */ 2175 return; 2176 } 2177 2178 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], 2179 GTK[GN], IGTK, [FTIE], [TIE * 2]) 2180 */ 2181 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2182 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2183 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ 2184 wpa_ie = sm->wpa_auth->wpa_ie; 2185 wpa_ie_len = sm->wpa_auth->wpa_ie_len; 2186 if (sm->wpa == WPA_VERSION_WPA && 2187 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && 2188 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { 2189 /* WPA-only STA, remove RSN IE and possible MDIE */ 2190 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2191 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN) 2192 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2193 wpa_ie_len = wpa_ie[1] + 2; 2194 } 2195 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2196 "sending 3/4 msg of 4-Way Handshake"); 2197 if (sm->wpa == WPA_VERSION_WPA2) { 2198 /* WPA2 send GTK in the 4-way handshake */ 2199 secure = 1; 2200 gtk = gsm->GTK[gsm->GN - 1]; 2201 gtk_len = gsm->GTK_len; 2202 if (sm->wpa_auth->conf.disable_gtk) { 2203 /* 2204 * Provide unique random GTK to each STA to prevent use 2205 * of GTK in the BSS. 2206 */ 2207 if (random_get_bytes(dummy_gtk, gtk_len) < 0) 2208 return; 2209 gtk = dummy_gtk; 2210 } 2211 keyidx = gsm->GN; 2212 _rsc = rsc; 2213 encr = 1; 2214 } else { 2215 /* WPA does not include GTK in msg 3/4 */ 2216 secure = 0; 2217 gtk = NULL; 2218 gtk_len = 0; 2219 keyidx = 0; 2220 _rsc = NULL; 2221 if (sm->rx_eapol_key_secure) { 2222 /* 2223 * It looks like Windows 7 supplicant tries to use 2224 * Secure bit in msg 2/4 after having reported Michael 2225 * MIC failure and it then rejects the 4-way handshake 2226 * if msg 3/4 does not set Secure bit. Work around this 2227 * by setting the Secure bit here even in the case of 2228 * WPA if the supplicant used it first. 2229 */ 2230 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2231 "STA used Secure bit in WPA msg 2/4 - " 2232 "set Secure for 3/4 as workaround"); 2233 secure = 1; 2234 } 2235 } 2236 2237 kde_len = wpa_ie_len + ieee80211w_kde_len(sm); 2238 if (gtk) 2239 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; 2240 #ifdef CONFIG_IEEE80211R 2241 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2242 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ 2243 kde_len += 300; /* FTIE + 2 * TIE */ 2244 } 2245 #endif /* CONFIG_IEEE80211R */ 2246 #ifdef CONFIG_P2P 2247 if (WPA_GET_BE32(sm->ip_addr) > 0) 2248 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4; 2249 #endif /* CONFIG_P2P */ 2250 kde = os_malloc(kde_len); 2251 if (kde == NULL) 2252 return; 2253 2254 pos = kde; 2255 os_memcpy(pos, wpa_ie, wpa_ie_len); 2256 pos += wpa_ie_len; 2257 #ifdef CONFIG_IEEE80211R 2258 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2259 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); 2260 if (res < 0) { 2261 wpa_printf(MSG_ERROR, "FT: Failed to insert " 2262 "PMKR1Name into RSN IE in EAPOL-Key data"); 2263 os_free(kde); 2264 return; 2265 } 2266 pos += res; 2267 } 2268 #endif /* CONFIG_IEEE80211R */ 2269 if (gtk) { 2270 u8 hdr[2]; 2271 hdr[0] = keyidx & 0x03; 2272 hdr[1] = 0; 2273 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2274 gtk, gtk_len); 2275 } 2276 pos = ieee80211w_kde_add(sm, pos); 2277 2278 #ifdef CONFIG_IEEE80211R 2279 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2280 int res; 2281 struct wpa_auth_config *conf; 2282 2283 conf = &sm->wpa_auth->conf; 2284 res = wpa_write_ftie(conf, conf->r0_key_holder, 2285 conf->r0_key_holder_len, 2286 NULL, NULL, pos, kde + kde_len - pos, 2287 NULL, 0); 2288 if (res < 0) { 2289 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " 2290 "into EAPOL-Key Key Data"); 2291 os_free(kde); 2292 return; 2293 } 2294 pos += res; 2295 2296 /* TIE[ReassociationDeadline] (TU) */ 2297 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2298 *pos++ = 5; 2299 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; 2300 WPA_PUT_LE32(pos, conf->reassociation_deadline); 2301 pos += 4; 2302 2303 /* TIE[KeyLifetime] (seconds) */ 2304 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2305 *pos++ = 5; 2306 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; 2307 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); 2308 pos += 4; 2309 } 2310 #endif /* CONFIG_IEEE80211R */ 2311 #ifdef CONFIG_P2P 2312 if (WPA_GET_BE32(sm->ip_addr) > 0) { 2313 u8 addr[3 * 4]; 2314 os_memcpy(addr, sm->ip_addr, 4); 2315 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4); 2316 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4); 2317 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC, 2318 addr, sizeof(addr), NULL, 0); 2319 } 2320 #endif /* CONFIG_P2P */ 2321 2322 wpa_send_eapol(sm->wpa_auth, sm, 2323 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | 2324 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | 2325 WPA_KEY_INFO_KEY_TYPE, 2326 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); 2327 os_free(kde); 2328 } 2329 2330 2331 SM_STATE(WPA_PTK, PTKINITDONE) 2332 { 2333 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); 2334 sm->EAPOLKeyReceived = FALSE; 2335 if (sm->Pair) { 2336 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); 2337 int klen = wpa_cipher_key_len(sm->pairwise); 2338 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 2339 sm->PTK.tk, klen)) { 2340 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 2341 return; 2342 } 2343 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 2344 sm->pairwise_set = TRUE; 2345 2346 if (sm->wpa_auth->conf.wpa_ptk_rekey) { 2347 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 2348 eloop_register_timeout(sm->wpa_auth->conf. 2349 wpa_ptk_rekey, 0, wpa_rekey_ptk, 2350 sm->wpa_auth, sm); 2351 } 2352 2353 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2354 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2355 WPA_EAPOL_authorized, 1); 2356 } 2357 } 2358 2359 if (0 /* IBSS == TRUE */) { 2360 sm->keycount++; 2361 if (sm->keycount == 2) { 2362 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2363 WPA_EAPOL_portValid, 1); 2364 } 2365 } else { 2366 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 2367 1); 2368 } 2369 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); 2370 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); 2371 if (sm->wpa == WPA_VERSION_WPA) 2372 sm->PInitAKeys = TRUE; 2373 else 2374 sm->has_GTK = TRUE; 2375 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2376 "pairwise key handshake completed (%s)", 2377 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2378 2379 #ifdef CONFIG_IEEE80211R 2380 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); 2381 #endif /* CONFIG_IEEE80211R */ 2382 } 2383 2384 2385 SM_STEP(WPA_PTK) 2386 { 2387 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 2388 2389 if (sm->Init) 2390 SM_ENTER(WPA_PTK, INITIALIZE); 2391 else if (sm->Disconnect 2392 /* || FIX: dot11RSNAConfigSALifetime timeout */) { 2393 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 2394 "WPA_PTK: sm->Disconnect"); 2395 SM_ENTER(WPA_PTK, DISCONNECT); 2396 } 2397 else if (sm->DeauthenticationRequest) 2398 SM_ENTER(WPA_PTK, DISCONNECTED); 2399 else if (sm->AuthenticationRequest) 2400 SM_ENTER(WPA_PTK, AUTHENTICATION); 2401 else if (sm->ReAuthenticationRequest) 2402 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2403 else if (sm->PTKRequest) 2404 SM_ENTER(WPA_PTK, PTKSTART); 2405 else switch (sm->wpa_ptk_state) { 2406 case WPA_PTK_INITIALIZE: 2407 break; 2408 case WPA_PTK_DISCONNECT: 2409 SM_ENTER(WPA_PTK, DISCONNECTED); 2410 break; 2411 case WPA_PTK_DISCONNECTED: 2412 SM_ENTER(WPA_PTK, INITIALIZE); 2413 break; 2414 case WPA_PTK_AUTHENTICATION: 2415 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2416 break; 2417 case WPA_PTK_AUTHENTICATION2: 2418 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 2419 wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2420 WPA_EAPOL_keyRun) > 0) 2421 SM_ENTER(WPA_PTK, INITPMK); 2422 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) 2423 /* FIX: && 802.1X::keyRun */) 2424 SM_ENTER(WPA_PTK, INITPSK); 2425 break; 2426 case WPA_PTK_INITPMK: 2427 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2428 WPA_EAPOL_keyAvailable) > 0) 2429 SM_ENTER(WPA_PTK, PTKSTART); 2430 else { 2431 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2432 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2433 "INITPMK - keyAvailable = false"); 2434 SM_ENTER(WPA_PTK, DISCONNECT); 2435 } 2436 break; 2437 case WPA_PTK_INITPSK: 2438 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, 2439 NULL)) 2440 SM_ENTER(WPA_PTK, PTKSTART); 2441 else { 2442 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2443 "no PSK configured for the STA"); 2444 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2445 SM_ENTER(WPA_PTK, DISCONNECT); 2446 } 2447 break; 2448 case WPA_PTK_PTKSTART: 2449 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2450 sm->EAPOLKeyPairwise) 2451 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2452 else if (sm->TimeoutCtr > 2453 (int) dot11RSNAConfigPairwiseUpdateCount) { 2454 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2455 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2456 "PTKSTART: Retry limit %d reached", 2457 dot11RSNAConfigPairwiseUpdateCount); 2458 SM_ENTER(WPA_PTK, DISCONNECT); 2459 } else if (sm->TimeoutEvt) 2460 SM_ENTER(WPA_PTK, PTKSTART); 2461 break; 2462 case WPA_PTK_PTKCALCNEGOTIATING: 2463 if (sm->MICVerified) 2464 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); 2465 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2466 sm->EAPOLKeyPairwise) 2467 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2468 else if (sm->TimeoutEvt) 2469 SM_ENTER(WPA_PTK, PTKSTART); 2470 break; 2471 case WPA_PTK_PTKCALCNEGOTIATING2: 2472 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2473 break; 2474 case WPA_PTK_PTKINITNEGOTIATING: 2475 if (sm->update_snonce) 2476 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2477 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2478 sm->EAPOLKeyPairwise && sm->MICVerified) 2479 SM_ENTER(WPA_PTK, PTKINITDONE); 2480 else if (sm->TimeoutCtr > 2481 (int) dot11RSNAConfigPairwiseUpdateCount) { 2482 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2483 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2484 "PTKINITNEGOTIATING: Retry limit %d " 2485 "reached", 2486 dot11RSNAConfigPairwiseUpdateCount); 2487 SM_ENTER(WPA_PTK, DISCONNECT); 2488 } else if (sm->TimeoutEvt) 2489 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2490 break; 2491 case WPA_PTK_PTKINITDONE: 2492 break; 2493 } 2494 } 2495 2496 2497 SM_STATE(WPA_PTK_GROUP, IDLE) 2498 { 2499 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); 2500 if (sm->Init) { 2501 /* Init flag is not cleared here, so avoid busy 2502 * loop by claiming nothing changed. */ 2503 sm->changed = FALSE; 2504 } 2505 sm->GTimeoutCtr = 0; 2506 } 2507 2508 2509 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) 2510 { 2511 u8 rsc[WPA_KEY_RSC_LEN]; 2512 struct wpa_group *gsm = sm->group; 2513 const u8 *kde; 2514 u8 *kde_buf = NULL, *pos, hdr[2]; 2515 size_t kde_len; 2516 u8 *gtk, dummy_gtk[32]; 2517 2518 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); 2519 2520 sm->GTimeoutCtr++; 2521 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { 2522 /* No point in sending the EAPOL-Key - we will disconnect 2523 * immediately following this. */ 2524 return; 2525 } 2526 2527 if (sm->wpa == WPA_VERSION_WPA) 2528 sm->PInitAKeys = FALSE; 2529 sm->TimeoutEvt = FALSE; 2530 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ 2531 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2532 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) 2533 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2534 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2535 "sending 1/2 msg of Group Key Handshake"); 2536 2537 gtk = gsm->GTK[gsm->GN - 1]; 2538 if (sm->wpa_auth->conf.disable_gtk) { 2539 /* 2540 * Provide unique random GTK to each STA to prevent use 2541 * of GTK in the BSS. 2542 */ 2543 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) 2544 return; 2545 gtk = dummy_gtk; 2546 } 2547 if (sm->wpa == WPA_VERSION_WPA2) { 2548 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + 2549 ieee80211w_kde_len(sm); 2550 kde_buf = os_malloc(kde_len); 2551 if (kde_buf == NULL) 2552 return; 2553 2554 kde = pos = kde_buf; 2555 hdr[0] = gsm->GN & 0x03; 2556 hdr[1] = 0; 2557 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2558 gtk, gsm->GTK_len); 2559 pos = ieee80211w_kde_add(sm, pos); 2560 kde_len = pos - kde; 2561 } else { 2562 kde = gtk; 2563 kde_len = gsm->GTK_len; 2564 } 2565 2566 wpa_send_eapol(sm->wpa_auth, sm, 2567 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | 2568 WPA_KEY_INFO_ACK | 2569 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), 2570 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1); 2571 2572 os_free(kde_buf); 2573 } 2574 2575 2576 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) 2577 { 2578 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); 2579 sm->EAPOLKeyReceived = FALSE; 2580 if (sm->GUpdateStationKeys) 2581 sm->group->GKeyDoneStations--; 2582 sm->GUpdateStationKeys = FALSE; 2583 sm->GTimeoutCtr = 0; 2584 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ 2585 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2586 "group key handshake completed (%s)", 2587 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2588 sm->has_GTK = TRUE; 2589 } 2590 2591 2592 SM_STATE(WPA_PTK_GROUP, KEYERROR) 2593 { 2594 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); 2595 if (sm->GUpdateStationKeys) 2596 sm->group->GKeyDoneStations--; 2597 sm->GUpdateStationKeys = FALSE; 2598 sm->Disconnect = TRUE; 2599 } 2600 2601 2602 SM_STEP(WPA_PTK_GROUP) 2603 { 2604 if (sm->Init || sm->PtkGroupInit) { 2605 SM_ENTER(WPA_PTK_GROUP, IDLE); 2606 sm->PtkGroupInit = FALSE; 2607 } else switch (sm->wpa_ptk_group_state) { 2608 case WPA_PTK_GROUP_IDLE: 2609 if (sm->GUpdateStationKeys || 2610 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) 2611 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2612 break; 2613 case WPA_PTK_GROUP_REKEYNEGOTIATING: 2614 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2615 !sm->EAPOLKeyPairwise && sm->MICVerified) 2616 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); 2617 else if (sm->GTimeoutCtr > 2618 (int) dot11RSNAConfigGroupUpdateCount) 2619 SM_ENTER(WPA_PTK_GROUP, KEYERROR); 2620 else if (sm->TimeoutEvt) 2621 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2622 break; 2623 case WPA_PTK_GROUP_KEYERROR: 2624 SM_ENTER(WPA_PTK_GROUP, IDLE); 2625 break; 2626 case WPA_PTK_GROUP_REKEYESTABLISHED: 2627 SM_ENTER(WPA_PTK_GROUP, IDLE); 2628 break; 2629 } 2630 } 2631 2632 2633 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 2634 struct wpa_group *group) 2635 { 2636 int ret = 0; 2637 2638 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2639 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2640 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", 2641 wpa_auth->addr, group->GNonce, 2642 group->GTK[group->GN - 1], group->GTK_len) < 0) 2643 ret = -1; 2644 wpa_hexdump_key(MSG_DEBUG, "GTK", 2645 group->GTK[group->GN - 1], group->GTK_len); 2646 2647 #ifdef CONFIG_IEEE80211W 2648 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2649 size_t len; 2650 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2651 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2652 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2653 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", 2654 wpa_auth->addr, group->GNonce, 2655 group->IGTK[group->GN_igtk - 4], len) < 0) 2656 ret = -1; 2657 wpa_hexdump_key(MSG_DEBUG, "IGTK", 2658 group->IGTK[group->GN_igtk - 4], len); 2659 } 2660 #endif /* CONFIG_IEEE80211W */ 2661 2662 return ret; 2663 } 2664 2665 2666 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, 2667 struct wpa_group *group) 2668 { 2669 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2670 "GTK_INIT (VLAN-ID %d)", group->vlan_id); 2671 group->changed = FALSE; /* GInit is not cleared here; avoid loop */ 2672 group->wpa_group_state = WPA_GROUP_GTK_INIT; 2673 2674 /* GTK[0..N] = 0 */ 2675 os_memset(group->GTK, 0, sizeof(group->GTK)); 2676 group->GN = 1; 2677 group->GM = 2; 2678 #ifdef CONFIG_IEEE80211W 2679 group->GN_igtk = 4; 2680 group->GM_igtk = 5; 2681 #endif /* CONFIG_IEEE80211W */ 2682 /* GTK[GN] = CalcGTK() */ 2683 wpa_gtk_update(wpa_auth, group); 2684 } 2685 2686 2687 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) 2688 { 2689 if (ctx != NULL && ctx != sm->group) 2690 return 0; 2691 2692 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { 2693 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2694 "Not in PTKINITDONE; skip Group Key update"); 2695 sm->GUpdateStationKeys = FALSE; 2696 return 0; 2697 } 2698 if (sm->GUpdateStationKeys) { 2699 /* 2700 * This should not really happen, so add a debug log entry. 2701 * Since we clear the GKeyDoneStations before the loop, the 2702 * station needs to be counted here anyway. 2703 */ 2704 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2705 "GUpdateStationKeys was already set when " 2706 "marking station for GTK rekeying"); 2707 } 2708 2709 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ 2710 if (sm->is_wnmsleep) 2711 return 0; 2712 2713 sm->group->GKeyDoneStations++; 2714 sm->GUpdateStationKeys = TRUE; 2715 2716 wpa_sm_step(sm); 2717 return 0; 2718 } 2719 2720 2721 #ifdef CONFIG_WNM 2722 /* update GTK when exiting WNM-Sleep Mode */ 2723 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) 2724 { 2725 if (sm == NULL || sm->is_wnmsleep) 2726 return; 2727 2728 wpa_group_update_sta(sm, NULL); 2729 } 2730 2731 2732 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) 2733 { 2734 if (sm) 2735 sm->is_wnmsleep = !!flag; 2736 } 2737 2738 2739 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2740 { 2741 struct wpa_group *gsm = sm->group; 2742 u8 *start = pos; 2743 2744 /* 2745 * GTK subelement: 2746 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 2747 * Key[5..32] 2748 */ 2749 *pos++ = WNM_SLEEP_SUBELEM_GTK; 2750 *pos++ = 11 + gsm->GTK_len; 2751 /* Key ID in B0-B1 of Key Info */ 2752 WPA_PUT_LE16(pos, gsm->GN & 0x03); 2753 pos += 2; 2754 *pos++ = gsm->GTK_len; 2755 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) 2756 return 0; 2757 pos += 8; 2758 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2759 pos += gsm->GTK_len; 2760 2761 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", 2762 gsm->GN); 2763 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", 2764 gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2765 2766 return pos - start; 2767 } 2768 2769 2770 #ifdef CONFIG_IEEE80211W 2771 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2772 { 2773 struct wpa_group *gsm = sm->group; 2774 u8 *start = pos; 2775 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2776 2777 /* 2778 * IGTK subelement: 2779 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] 2780 */ 2781 *pos++ = WNM_SLEEP_SUBELEM_IGTK; 2782 *pos++ = 2 + 6 + len; 2783 WPA_PUT_LE16(pos, gsm->GN_igtk); 2784 pos += 2; 2785 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) 2786 return 0; 2787 pos += 6; 2788 2789 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len); 2790 pos += len; 2791 2792 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", 2793 gsm->GN_igtk); 2794 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", 2795 gsm->IGTK[gsm->GN_igtk - 4], len); 2796 2797 return pos - start; 2798 } 2799 #endif /* CONFIG_IEEE80211W */ 2800 #endif /* CONFIG_WNM */ 2801 2802 2803 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, 2804 struct wpa_group *group) 2805 { 2806 int tmp; 2807 2808 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2809 "SETKEYS (VLAN-ID %d)", group->vlan_id); 2810 group->changed = TRUE; 2811 group->wpa_group_state = WPA_GROUP_SETKEYS; 2812 group->GTKReKey = FALSE; 2813 tmp = group->GM; 2814 group->GM = group->GN; 2815 group->GN = tmp; 2816 #ifdef CONFIG_IEEE80211W 2817 tmp = group->GM_igtk; 2818 group->GM_igtk = group->GN_igtk; 2819 group->GN_igtk = tmp; 2820 #endif /* CONFIG_IEEE80211W */ 2821 /* "GKeyDoneStations = GNoStations" is done in more robust way by 2822 * counting the STAs that are marked with GUpdateStationKeys instead of 2823 * including all STAs that could be in not-yet-completed state. */ 2824 wpa_gtk_update(wpa_auth, group); 2825 2826 if (group->GKeyDoneStations) { 2827 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " 2828 "GKeyDoneStations=%d when starting new GTK rekey", 2829 group->GKeyDoneStations); 2830 group->GKeyDoneStations = 0; 2831 } 2832 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); 2833 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", 2834 group->GKeyDoneStations); 2835 } 2836 2837 2838 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 2839 struct wpa_group *group) 2840 { 2841 int ret = 0; 2842 2843 if (wpa_auth_set_key(wpa_auth, group->vlan_id, 2844 wpa_cipher_to_alg(wpa_auth->conf.wpa_group), 2845 broadcast_ether_addr, group->GN, 2846 group->GTK[group->GN - 1], group->GTK_len) < 0) 2847 ret = -1; 2848 2849 #ifdef CONFIG_IEEE80211W 2850 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2851 enum wpa_alg alg; 2852 size_t len; 2853 2854 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher); 2855 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2856 2857 if (ret == 0 && 2858 wpa_auth_set_key(wpa_auth, group->vlan_id, alg, 2859 broadcast_ether_addr, group->GN_igtk, 2860 group->IGTK[group->GN_igtk - 4], len) < 0) 2861 ret = -1; 2862 } 2863 #endif /* CONFIG_IEEE80211W */ 2864 2865 return ret; 2866 } 2867 2868 2869 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx) 2870 { 2871 if (sm->group == ctx) { 2872 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR 2873 " for discconnection due to fatal failure", 2874 MAC2STR(sm->addr)); 2875 sm->Disconnect = TRUE; 2876 } 2877 2878 return 0; 2879 } 2880 2881 2882 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth, 2883 struct wpa_group *group) 2884 { 2885 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE"); 2886 group->changed = TRUE; 2887 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE; 2888 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group); 2889 } 2890 2891 2892 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, 2893 struct wpa_group *group) 2894 { 2895 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2896 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); 2897 group->changed = TRUE; 2898 group->wpa_group_state = WPA_GROUP_SETKEYSDONE; 2899 2900 if (wpa_group_config_group_keys(wpa_auth, group) < 0) { 2901 wpa_group_fatal_failure(wpa_auth, group); 2902 return -1; 2903 } 2904 2905 return 0; 2906 } 2907 2908 2909 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 2910 struct wpa_group *group) 2911 { 2912 if (group->GInit) { 2913 wpa_group_gtk_init(wpa_auth, group); 2914 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) { 2915 /* Do not allow group operations */ 2916 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && 2917 group->GTKAuthenticator) { 2918 wpa_group_setkeysdone(wpa_auth, group); 2919 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && 2920 group->GTKReKey) { 2921 wpa_group_setkeys(wpa_auth, group); 2922 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { 2923 if (group->GKeyDoneStations == 0) 2924 wpa_group_setkeysdone(wpa_auth, group); 2925 else if (group->GTKReKey) 2926 wpa_group_setkeys(wpa_auth, group); 2927 } 2928 } 2929 2930 2931 static int wpa_sm_step(struct wpa_state_machine *sm) 2932 { 2933 if (sm == NULL) 2934 return 0; 2935 2936 if (sm->in_step_loop) { 2937 /* This should not happen, but if it does, make sure we do not 2938 * end up freeing the state machine too early by exiting the 2939 * recursive call. */ 2940 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); 2941 return 0; 2942 } 2943 2944 sm->in_step_loop = 1; 2945 do { 2946 if (sm->pending_deinit) 2947 break; 2948 2949 sm->changed = FALSE; 2950 sm->wpa_auth->group->changed = FALSE; 2951 2952 SM_STEP_RUN(WPA_PTK); 2953 if (sm->pending_deinit) 2954 break; 2955 SM_STEP_RUN(WPA_PTK_GROUP); 2956 if (sm->pending_deinit) 2957 break; 2958 wpa_group_sm_step(sm->wpa_auth, sm->group); 2959 } while (sm->changed || sm->wpa_auth->group->changed); 2960 sm->in_step_loop = 0; 2961 2962 if (sm->pending_deinit) { 2963 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " 2964 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 2965 wpa_free_sta_sm(sm); 2966 return 1; 2967 } 2968 return 0; 2969 } 2970 2971 2972 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) 2973 { 2974 struct wpa_state_machine *sm = eloop_ctx; 2975 wpa_sm_step(sm); 2976 } 2977 2978 2979 void wpa_auth_sm_notify(struct wpa_state_machine *sm) 2980 { 2981 if (sm == NULL) 2982 return; 2983 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); 2984 } 2985 2986 2987 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) 2988 { 2989 int tmp, i; 2990 struct wpa_group *group; 2991 2992 if (wpa_auth == NULL) 2993 return; 2994 2995 group = wpa_auth->group; 2996 2997 for (i = 0; i < 2; i++) { 2998 tmp = group->GM; 2999 group->GM = group->GN; 3000 group->GN = tmp; 3001 #ifdef CONFIG_IEEE80211W 3002 tmp = group->GM_igtk; 3003 group->GM_igtk = group->GN_igtk; 3004 group->GN_igtk = tmp; 3005 #endif /* CONFIG_IEEE80211W */ 3006 wpa_gtk_update(wpa_auth, group); 3007 wpa_group_config_group_keys(wpa_auth, group); 3008 } 3009 } 3010 3011 3012 static const char * wpa_bool_txt(int val) 3013 { 3014 return val ? "TRUE" : "FALSE"; 3015 } 3016 3017 3018 #define RSN_SUITE "%02x-%02x-%02x-%d" 3019 #define RSN_SUITE_ARG(s) \ 3020 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 3021 3022 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) 3023 { 3024 int len = 0, ret; 3025 char pmkid_txt[PMKID_LEN * 2 + 1]; 3026 #ifdef CONFIG_RSN_PREAUTH 3027 const int preauth = 1; 3028 #else /* CONFIG_RSN_PREAUTH */ 3029 const int preauth = 0; 3030 #endif /* CONFIG_RSN_PREAUTH */ 3031 3032 if (wpa_auth == NULL) 3033 return len; 3034 3035 ret = os_snprintf(buf + len, buflen - len, 3036 "dot11RSNAOptionImplemented=TRUE\n" 3037 "dot11RSNAPreauthenticationImplemented=%s\n" 3038 "dot11RSNAEnabled=%s\n" 3039 "dot11RSNAPreauthenticationEnabled=%s\n", 3040 wpa_bool_txt(preauth), 3041 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), 3042 wpa_bool_txt(wpa_auth->conf.rsn_preauth)); 3043 if (os_snprintf_error(buflen - len, ret)) 3044 return len; 3045 len += ret; 3046 3047 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 3048 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); 3049 3050 ret = os_snprintf( 3051 buf + len, buflen - len, 3052 "dot11RSNAConfigVersion=%u\n" 3053 "dot11RSNAConfigPairwiseKeysSupported=9999\n" 3054 /* FIX: dot11RSNAConfigGroupCipher */ 3055 /* FIX: dot11RSNAConfigGroupRekeyMethod */ 3056 /* FIX: dot11RSNAConfigGroupRekeyTime */ 3057 /* FIX: dot11RSNAConfigGroupRekeyPackets */ 3058 "dot11RSNAConfigGroupRekeyStrict=%u\n" 3059 "dot11RSNAConfigGroupUpdateCount=%u\n" 3060 "dot11RSNAConfigPairwiseUpdateCount=%u\n" 3061 "dot11RSNAConfigGroupCipherSize=%u\n" 3062 "dot11RSNAConfigPMKLifetime=%u\n" 3063 "dot11RSNAConfigPMKReauthThreshold=%u\n" 3064 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" 3065 "dot11RSNAConfigSATimeout=%u\n" 3066 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 3067 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 3068 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 3069 "dot11RSNAPMKIDUsed=%s\n" 3070 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 3071 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 3072 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 3073 "dot11RSNATKIPCounterMeasuresInvoked=%u\n" 3074 "dot11RSNA4WayHandshakeFailures=%u\n" 3075 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", 3076 RSN_VERSION, 3077 !!wpa_auth->conf.wpa_strict_rekey, 3078 dot11RSNAConfigGroupUpdateCount, 3079 dot11RSNAConfigPairwiseUpdateCount, 3080 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, 3081 dot11RSNAConfigPMKLifetime, 3082 dot11RSNAConfigPMKReauthThreshold, 3083 dot11RSNAConfigSATimeout, 3084 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), 3085 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), 3086 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), 3087 pmkid_txt, 3088 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), 3089 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), 3090 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), 3091 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, 3092 wpa_auth->dot11RSNA4WayHandshakeFailures); 3093 if (os_snprintf_error(buflen - len, ret)) 3094 return len; 3095 len += ret; 3096 3097 /* TODO: dot11RSNAConfigPairwiseCiphersTable */ 3098 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ 3099 3100 /* Private MIB */ 3101 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", 3102 wpa_auth->group->wpa_group_state); 3103 if (os_snprintf_error(buflen - len, ret)) 3104 return len; 3105 len += ret; 3106 3107 return len; 3108 } 3109 3110 3111 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) 3112 { 3113 int len = 0, ret; 3114 u32 pairwise = 0; 3115 3116 if (sm == NULL) 3117 return 0; 3118 3119 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ 3120 3121 /* dot11RSNAStatsEntry */ 3122 3123 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? 3124 WPA_PROTO_RSN : WPA_PROTO_WPA, 3125 sm->pairwise); 3126 if (pairwise == 0) 3127 return 0; 3128 3129 ret = os_snprintf( 3130 buf + len, buflen - len, 3131 /* TODO: dot11RSNAStatsIndex */ 3132 "dot11RSNAStatsSTAAddress=" MACSTR "\n" 3133 "dot11RSNAStatsVersion=1\n" 3134 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" 3135 /* TODO: dot11RSNAStatsTKIPICVErrors */ 3136 "dot11RSNAStatsTKIPLocalMICFailures=%u\n" 3137 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" 3138 /* TODO: dot11RSNAStatsCCMPReplays */ 3139 /* TODO: dot11RSNAStatsCCMPDecryptErrors */ 3140 /* TODO: dot11RSNAStatsTKIPReplays */, 3141 MAC2STR(sm->addr), 3142 RSN_SUITE_ARG(pairwise), 3143 sm->dot11RSNAStatsTKIPLocalMICFailures, 3144 sm->dot11RSNAStatsTKIPRemoteMICFailures); 3145 if (os_snprintf_error(buflen - len, ret)) 3146 return len; 3147 len += ret; 3148 3149 /* Private MIB */ 3150 ret = os_snprintf(buf + len, buflen - len, 3151 "hostapdWPAPTKState=%d\n" 3152 "hostapdWPAPTKGroupState=%d\n", 3153 sm->wpa_ptk_state, 3154 sm->wpa_ptk_group_state); 3155 if (os_snprintf_error(buflen - len, ret)) 3156 return len; 3157 len += ret; 3158 3159 return len; 3160 } 3161 3162 3163 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) 3164 { 3165 if (wpa_auth) 3166 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; 3167 } 3168 3169 3170 int wpa_auth_pairwise_set(struct wpa_state_machine *sm) 3171 { 3172 return sm && sm->pairwise_set; 3173 } 3174 3175 3176 int wpa_auth_get_pairwise(struct wpa_state_machine *sm) 3177 { 3178 return sm->pairwise; 3179 } 3180 3181 3182 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) 3183 { 3184 if (sm == NULL) 3185 return -1; 3186 return sm->wpa_key_mgmt; 3187 } 3188 3189 3190 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) 3191 { 3192 if (sm == NULL) 3193 return 0; 3194 return sm->wpa; 3195 } 3196 3197 3198 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, 3199 struct rsn_pmksa_cache_entry *entry) 3200 { 3201 if (sm == NULL || sm->pmksa != entry) 3202 return -1; 3203 sm->pmksa = NULL; 3204 return 0; 3205 } 3206 3207 3208 struct rsn_pmksa_cache_entry * 3209 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) 3210 { 3211 return sm ? sm->pmksa : NULL; 3212 } 3213 3214 3215 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) 3216 { 3217 if (sm) 3218 sm->dot11RSNAStatsTKIPLocalMICFailures++; 3219 } 3220 3221 3222 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) 3223 { 3224 if (wpa_auth == NULL) 3225 return NULL; 3226 *len = wpa_auth->wpa_ie_len; 3227 return wpa_auth->wpa_ie; 3228 } 3229 3230 3231 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, 3232 int session_timeout, struct eapol_state_machine *eapol) 3233 { 3234 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || 3235 sm->wpa_auth->conf.disable_pmksa_caching) 3236 return -1; 3237 3238 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, 3239 sm->PTK.kck, sm->PTK.kck_len, 3240 sm->wpa_auth->addr, sm->addr, session_timeout, 3241 eapol, sm->wpa_key_mgmt)) 3242 return 0; 3243 3244 return -1; 3245 } 3246 3247 3248 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, 3249 const u8 *pmk, size_t len, const u8 *sta_addr, 3250 int session_timeout, 3251 struct eapol_state_machine *eapol) 3252 { 3253 if (wpa_auth == NULL) 3254 return -1; 3255 3256 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, 3257 NULL, 0, 3258 wpa_auth->addr, 3259 sta_addr, session_timeout, eapol, 3260 WPA_KEY_MGMT_IEEE8021X)) 3261 return 0; 3262 3263 return -1; 3264 } 3265 3266 3267 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr, 3268 const u8 *pmk) 3269 { 3270 if (wpa_auth->conf.disable_pmksa_caching) 3271 return -1; 3272 3273 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, 3274 NULL, 0, 3275 wpa_auth->addr, addr, 0, NULL, 3276 WPA_KEY_MGMT_SAE)) 3277 return 0; 3278 3279 return -1; 3280 } 3281 3282 3283 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth, 3284 const u8 *sta_addr) 3285 { 3286 struct rsn_pmksa_cache_entry *pmksa; 3287 3288 if (wpa_auth == NULL || wpa_auth->pmksa == NULL) 3289 return; 3290 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL); 3291 if (pmksa) { 3292 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for " 3293 MACSTR " based on request", MAC2STR(sta_addr)); 3294 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa); 3295 } 3296 } 3297 3298 3299 /* 3300 * Remove and free the group from wpa_authenticator. This is triggered by a 3301 * callback to make sure nobody is currently iterating the group list while it 3302 * gets modified. 3303 */ 3304 static void wpa_group_free(struct wpa_authenticator *wpa_auth, 3305 struct wpa_group *group) 3306 { 3307 struct wpa_group *prev = wpa_auth->group; 3308 3309 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d", 3310 group->vlan_id); 3311 3312 while (prev) { 3313 if (prev->next == group) { 3314 /* This never frees the special first group as needed */ 3315 prev->next = group->next; 3316 os_free(group); 3317 break; 3318 } 3319 prev = prev->next; 3320 } 3321 3322 } 3323 3324 3325 /* Increase the reference counter for group */ 3326 static void wpa_group_get(struct wpa_authenticator *wpa_auth, 3327 struct wpa_group *group) 3328 { 3329 /* Skip the special first group */ 3330 if (wpa_auth->group == group) 3331 return; 3332 3333 group->references++; 3334 } 3335 3336 3337 /* Decrease the reference counter and maybe free the group */ 3338 static void wpa_group_put(struct wpa_authenticator *wpa_auth, 3339 struct wpa_group *group) 3340 { 3341 /* Skip the special first group */ 3342 if (wpa_auth->group == group) 3343 return; 3344 3345 group->references--; 3346 if (group->references) 3347 return; 3348 wpa_group_free(wpa_auth, group); 3349 } 3350 3351 3352 /* 3353 * Add a group that has its references counter set to zero. Caller needs to 3354 * call wpa_group_get() on the return value to mark the entry in use. 3355 */ 3356 static struct wpa_group * 3357 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) 3358 { 3359 struct wpa_group *group; 3360 3361 if (wpa_auth == NULL || wpa_auth->group == NULL) 3362 return NULL; 3363 3364 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", 3365 vlan_id); 3366 group = wpa_group_init(wpa_auth, vlan_id, 0); 3367 if (group == NULL) 3368 return NULL; 3369 3370 group->next = wpa_auth->group->next; 3371 wpa_auth->group->next = group; 3372 3373 return group; 3374 } 3375 3376 3377 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) 3378 { 3379 struct wpa_group *group; 3380 3381 if (sm == NULL || sm->wpa_auth == NULL) 3382 return 0; 3383 3384 group = sm->wpa_auth->group; 3385 while (group) { 3386 if (group->vlan_id == vlan_id) 3387 break; 3388 group = group->next; 3389 } 3390 3391 if (group == NULL) { 3392 group = wpa_auth_add_group(sm->wpa_auth, vlan_id); 3393 if (group == NULL) 3394 return -1; 3395 } 3396 3397 if (sm->group == group) 3398 return 0; 3399 3400 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 3401 return -1; 3402 3403 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " 3404 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); 3405 3406 wpa_group_get(sm->wpa_auth, group); 3407 wpa_group_put(sm->wpa_auth, sm->group); 3408 sm->group = group; 3409 3410 return 0; 3411 } 3412 3413 3414 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, 3415 struct wpa_state_machine *sm, int ack) 3416 { 3417 if (wpa_auth == NULL || sm == NULL) 3418 return; 3419 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR 3420 " ack=%d", MAC2STR(sm->addr), ack); 3421 if (sm->pending_1_of_4_timeout && ack) { 3422 /* 3423 * Some deployed supplicant implementations update their SNonce 3424 * for each EAPOL-Key 2/4 message even within the same 4-way 3425 * handshake and then fail to use the first SNonce when 3426 * deriving the PTK. This results in unsuccessful 4-way 3427 * handshake whenever the relatively short initial timeout is 3428 * reached and EAPOL-Key 1/4 is retransmitted. Try to work 3429 * around this by increasing the timeout now that we know that 3430 * the station has received the frame. 3431 */ 3432 int timeout_ms = eapol_key_timeout_subseq; 3433 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " 3434 "timeout by %u ms because of acknowledged frame", 3435 timeout_ms); 3436 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 3437 eloop_register_timeout(timeout_ms / 1000, 3438 (timeout_ms % 1000) * 1000, 3439 wpa_send_eapol_timeout, wpa_auth, sm); 3440 } 3441 } 3442 3443 3444 int wpa_auth_uses_sae(struct wpa_state_machine *sm) 3445 { 3446 if (sm == NULL) 3447 return 0; 3448 return wpa_key_mgmt_sae(sm->wpa_key_mgmt); 3449 } 3450 3451 3452 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm) 3453 { 3454 if (sm == NULL) 3455 return 0; 3456 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE; 3457 } 3458 3459 3460 #ifdef CONFIG_P2P 3461 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr) 3462 { 3463 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0) 3464 return -1; 3465 os_memcpy(addr, sm->ip_addr, 4); 3466 return 0; 3467 } 3468 #endif /* CONFIG_P2P */ 3469 3470 3471 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth, 3472 struct radius_das_attrs *attr) 3473 { 3474 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr); 3475 } 3476 3477 3478 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth) 3479 { 3480 struct wpa_group *group; 3481 3482 if (!wpa_auth) 3483 return; 3484 for (group = wpa_auth->group; group; group = group->next) 3485 wpa_group_config_group_keys(wpa_auth, group); 3486 } 3487
