1 /* 2 * IEEE 802.11 RSN / WPA Authenticator 3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "utils/eloop.h" 13 #include "utils/state_machine.h" 14 #include "utils/bitfield.h" 15 #include "common/ieee802_11_defs.h" 16 #include "crypto/aes_wrap.h" 17 #include "crypto/crypto.h" 18 #include "crypto/sha1.h" 19 #include "crypto/sha256.h" 20 #include "crypto/random.h" 21 #include "eapol_auth/eapol_auth_sm.h" 22 #include "ap_config.h" 23 #include "ieee802_11.h" 24 #include "wpa_auth.h" 25 #include "pmksa_cache_auth.h" 26 #include "wpa_auth_i.h" 27 #include "wpa_auth_ie.h" 28 29 #define STATE_MACHINE_DATA struct wpa_state_machine 30 #define STATE_MACHINE_DEBUG_PREFIX "WPA" 31 #define STATE_MACHINE_ADDR sm->addr 32 33 34 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx); 35 static int wpa_sm_step(struct wpa_state_machine *sm); 36 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data, 37 size_t data_len); 38 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx); 39 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 40 struct wpa_group *group); 41 static void wpa_request_new_ptk(struct wpa_state_machine *sm); 42 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 43 struct wpa_group *group); 44 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 45 struct wpa_group *group); 46 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce, 47 const u8 *pmk, struct wpa_ptk *ptk); 48 static void wpa_group_free(struct wpa_authenticator *wpa_auth, 49 struct wpa_group *group); 50 static void wpa_group_get(struct wpa_authenticator *wpa_auth, 51 struct wpa_group *group); 52 static void wpa_group_put(struct wpa_authenticator *wpa_auth, 53 struct wpa_group *group); 54 55 static const u32 dot11RSNAConfigGroupUpdateCount = 4; 56 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4; 57 static const u32 eapol_key_timeout_first = 100; /* ms */ 58 static const u32 eapol_key_timeout_subseq = 1000; /* ms */ 59 static const u32 eapol_key_timeout_first_group = 500; /* ms */ 60 61 /* TODO: make these configurable */ 62 static const int dot11RSNAConfigPMKLifetime = 43200; 63 static const int dot11RSNAConfigPMKReauthThreshold = 70; 64 static const int dot11RSNAConfigSATimeout = 60; 65 66 67 static inline int wpa_auth_mic_failure_report( 68 struct wpa_authenticator *wpa_auth, const u8 *addr) 69 { 70 if (wpa_auth->cb.mic_failure_report) 71 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr); 72 return 0; 73 } 74 75 76 static inline void wpa_auth_psk_failure_report( 77 struct wpa_authenticator *wpa_auth, const u8 *addr) 78 { 79 if (wpa_auth->cb.psk_failure_report) 80 wpa_auth->cb.psk_failure_report(wpa_auth->cb.ctx, addr); 81 } 82 83 84 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth, 85 const u8 *addr, wpa_eapol_variable var, 86 int value) 87 { 88 if (wpa_auth->cb.set_eapol) 89 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value); 90 } 91 92 93 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth, 94 const u8 *addr, wpa_eapol_variable var) 95 { 96 if (wpa_auth->cb.get_eapol == NULL) 97 return -1; 98 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var); 99 } 100 101 102 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth, 103 const u8 *addr, 104 const u8 *p2p_dev_addr, 105 const u8 *prev_psk) 106 { 107 if (wpa_auth->cb.get_psk == NULL) 108 return NULL; 109 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr, 110 prev_psk); 111 } 112 113 114 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth, 115 const u8 *addr, u8 *msk, size_t *len) 116 { 117 if (wpa_auth->cb.get_msk == NULL) 118 return -1; 119 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len); 120 } 121 122 123 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 124 int vlan_id, 125 enum wpa_alg alg, const u8 *addr, int idx, 126 u8 *key, size_t key_len) 127 { 128 if (wpa_auth->cb.set_key == NULL) 129 return -1; 130 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 131 key, key_len); 132 } 133 134 135 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 136 const u8 *addr, int idx, u8 *seq) 137 { 138 if (wpa_auth->cb.get_seqnum == NULL) 139 return -1; 140 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 141 } 142 143 144 static inline int 145 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr, 146 const u8 *data, size_t data_len, int encrypt) 147 { 148 if (wpa_auth->cb.send_eapol == NULL) 149 return -1; 150 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len, 151 encrypt); 152 } 153 154 155 #ifdef CONFIG_MESH 156 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth, 157 const u8 *addr) 158 { 159 if (wpa_auth->cb.start_ampe == NULL) 160 return -1; 161 return wpa_auth->cb.start_ampe(wpa_auth->cb.ctx, addr); 162 } 163 #endif /* CONFIG_MESH */ 164 165 166 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth, 167 int (*cb)(struct wpa_state_machine *sm, void *ctx), 168 void *cb_ctx) 169 { 170 if (wpa_auth->cb.for_each_sta == NULL) 171 return 0; 172 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx); 173 } 174 175 176 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth, 177 int (*cb)(struct wpa_authenticator *a, void *ctx), 178 void *cb_ctx) 179 { 180 if (wpa_auth->cb.for_each_auth == NULL) 181 return 0; 182 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx); 183 } 184 185 186 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr, 187 logger_level level, const char *txt) 188 { 189 if (wpa_auth->cb.logger == NULL) 190 return; 191 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt); 192 } 193 194 195 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr, 196 logger_level level, const char *fmt, ...) 197 { 198 char *format; 199 int maxlen; 200 va_list ap; 201 202 if (wpa_auth->cb.logger == NULL) 203 return; 204 205 maxlen = os_strlen(fmt) + 100; 206 format = os_malloc(maxlen); 207 if (!format) 208 return; 209 210 va_start(ap, fmt); 211 vsnprintf(format, maxlen, fmt, ap); 212 va_end(ap); 213 214 wpa_auth_logger(wpa_auth, addr, level, format); 215 216 os_free(format); 217 } 218 219 220 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth, 221 const u8 *addr) 222 { 223 if (wpa_auth->cb.disconnect == NULL) 224 return; 225 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr)); 226 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr, 227 WLAN_REASON_PREV_AUTH_NOT_VALID); 228 } 229 230 231 static int wpa_use_aes_cmac(struct wpa_state_machine *sm) 232 { 233 int ret = 0; 234 #ifdef CONFIG_IEEE80211R 235 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 236 ret = 1; 237 #endif /* CONFIG_IEEE80211R */ 238 #ifdef CONFIG_IEEE80211W 239 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt)) 240 ret = 1; 241 #endif /* CONFIG_IEEE80211W */ 242 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) 243 ret = 1; 244 return ret; 245 } 246 247 248 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx) 249 { 250 struct wpa_authenticator *wpa_auth = eloop_ctx; 251 252 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) { 253 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 254 "initialization."); 255 } else { 256 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd"); 257 wpa_hexdump_key(MSG_DEBUG, "GMK", 258 wpa_auth->group->GMK, WPA_GMK_LEN); 259 } 260 261 if (wpa_auth->conf.wpa_gmk_rekey) { 262 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 263 wpa_rekey_gmk, wpa_auth, NULL); 264 } 265 } 266 267 268 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx) 269 { 270 struct wpa_authenticator *wpa_auth = eloop_ctx; 271 struct wpa_group *group, *next; 272 273 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK"); 274 group = wpa_auth->group; 275 while (group) { 276 wpa_group_get(wpa_auth, group); 277 278 group->GTKReKey = TRUE; 279 do { 280 group->changed = FALSE; 281 wpa_group_sm_step(wpa_auth, group); 282 } while (group->changed); 283 284 next = group->next; 285 wpa_group_put(wpa_auth, group); 286 group = next; 287 } 288 289 if (wpa_auth->conf.wpa_group_rekey) { 290 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 291 0, wpa_rekey_gtk, wpa_auth, NULL); 292 } 293 } 294 295 296 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 297 { 298 struct wpa_authenticator *wpa_auth = eloop_ctx; 299 struct wpa_state_machine *sm = timeout_ctx; 300 301 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK"); 302 wpa_request_new_ptk(sm); 303 wpa_sm_step(sm); 304 } 305 306 307 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx) 308 { 309 if (sm->pmksa == ctx) 310 sm->pmksa = NULL; 311 return 0; 312 } 313 314 315 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 316 void *ctx) 317 { 318 struct wpa_authenticator *wpa_auth = ctx; 319 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry); 320 } 321 322 323 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth, 324 struct wpa_group *group) 325 { 326 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)]; 327 u8 rkey[32]; 328 unsigned long ptr; 329 330 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0) 331 return -1; 332 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN); 333 334 /* 335 * Counter = PRF-256(Random number, "Init Counter", 336 * Local MAC Address || Time) 337 */ 338 os_memcpy(buf, wpa_auth->addr, ETH_ALEN); 339 wpa_get_ntp_timestamp(buf + ETH_ALEN); 340 ptr = (unsigned long) group; 341 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr)); 342 if (random_get_bytes(rkey, sizeof(rkey)) < 0) 343 return -1; 344 345 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf), 346 group->Counter, WPA_NONCE_LEN) < 0) 347 return -1; 348 wpa_hexdump_key(MSG_DEBUG, "Key Counter", 349 group->Counter, WPA_NONCE_LEN); 350 351 return 0; 352 } 353 354 355 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth, 356 int vlan_id, int delay_init) 357 { 358 struct wpa_group *group; 359 360 group = os_zalloc(sizeof(struct wpa_group)); 361 if (group == NULL) 362 return NULL; 363 364 group->GTKAuthenticator = TRUE; 365 group->vlan_id = vlan_id; 366 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 367 368 if (random_pool_ready() != 1) { 369 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 370 "for secure operations - update keys later when " 371 "the first station connects"); 372 } 373 374 /* 375 * Set initial GMK/Counter value here. The actual values that will be 376 * used in negotiations will be set once the first station tries to 377 * connect. This allows more time for collecting additional randomness 378 * on embedded devices. 379 */ 380 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) { 381 wpa_printf(MSG_ERROR, "Failed to get random data for WPA " 382 "initialization."); 383 os_free(group); 384 return NULL; 385 } 386 387 group->GInit = TRUE; 388 if (delay_init) { 389 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start " 390 "until Beacon frames have been configured"); 391 /* Initialization is completed in wpa_init_keys(). */ 392 } else { 393 wpa_group_sm_step(wpa_auth, group); 394 group->GInit = FALSE; 395 wpa_group_sm_step(wpa_auth, group); 396 } 397 398 return group; 399 } 400 401 402 /** 403 * wpa_init - Initialize WPA authenticator 404 * @addr: Authenticator address 405 * @conf: Configuration for WPA authenticator 406 * @cb: Callback functions for WPA authenticator 407 * Returns: Pointer to WPA authenticator data or %NULL on failure 408 */ 409 struct wpa_authenticator * wpa_init(const u8 *addr, 410 struct wpa_auth_config *conf, 411 struct wpa_auth_callbacks *cb) 412 { 413 struct wpa_authenticator *wpa_auth; 414 415 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator)); 416 if (wpa_auth == NULL) 417 return NULL; 418 os_memcpy(wpa_auth->addr, addr, ETH_ALEN); 419 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 420 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb)); 421 422 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 423 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 424 os_free(wpa_auth); 425 return NULL; 426 } 427 428 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1); 429 if (wpa_auth->group == NULL) { 430 os_free(wpa_auth->wpa_ie); 431 os_free(wpa_auth); 432 return NULL; 433 } 434 435 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb, 436 wpa_auth); 437 if (wpa_auth->pmksa == NULL) { 438 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed."); 439 os_free(wpa_auth->group); 440 os_free(wpa_auth->wpa_ie); 441 os_free(wpa_auth); 442 return NULL; 443 } 444 445 #ifdef CONFIG_IEEE80211R 446 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init(); 447 if (wpa_auth->ft_pmk_cache == NULL) { 448 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed."); 449 os_free(wpa_auth->group); 450 os_free(wpa_auth->wpa_ie); 451 pmksa_cache_auth_deinit(wpa_auth->pmksa); 452 os_free(wpa_auth); 453 return NULL; 454 } 455 #endif /* CONFIG_IEEE80211R */ 456 457 if (wpa_auth->conf.wpa_gmk_rekey) { 458 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, 459 wpa_rekey_gmk, wpa_auth, NULL); 460 } 461 462 if (wpa_auth->conf.wpa_group_rekey) { 463 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0, 464 wpa_rekey_gtk, wpa_auth, NULL); 465 } 466 467 #ifdef CONFIG_P2P 468 if (WPA_GET_BE32(conf->ip_addr_start)) { 469 int count = WPA_GET_BE32(conf->ip_addr_end) - 470 WPA_GET_BE32(conf->ip_addr_start) + 1; 471 if (count > 1000) 472 count = 1000; 473 if (count > 0) 474 wpa_auth->ip_pool = bitfield_alloc(count); 475 } 476 #endif /* CONFIG_P2P */ 477 478 return wpa_auth; 479 } 480 481 482 int wpa_init_keys(struct wpa_authenticator *wpa_auth) 483 { 484 struct wpa_group *group = wpa_auth->group; 485 486 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial " 487 "keys"); 488 wpa_group_sm_step(wpa_auth, group); 489 group->GInit = FALSE; 490 wpa_group_sm_step(wpa_auth, group); 491 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 492 return -1; 493 return 0; 494 } 495 496 497 /** 498 * wpa_deinit - Deinitialize WPA authenticator 499 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 500 */ 501 void wpa_deinit(struct wpa_authenticator *wpa_auth) 502 { 503 struct wpa_group *group, *prev; 504 505 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL); 506 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 507 508 #ifdef CONFIG_PEERKEY 509 while (wpa_auth->stsl_negotiations) 510 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations); 511 #endif /* CONFIG_PEERKEY */ 512 513 pmksa_cache_auth_deinit(wpa_auth->pmksa); 514 515 #ifdef CONFIG_IEEE80211R 516 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache); 517 wpa_auth->ft_pmk_cache = NULL; 518 #endif /* CONFIG_IEEE80211R */ 519 520 #ifdef CONFIG_P2P 521 bitfield_free(wpa_auth->ip_pool); 522 #endif /* CONFIG_P2P */ 523 524 525 os_free(wpa_auth->wpa_ie); 526 527 group = wpa_auth->group; 528 while (group) { 529 prev = group; 530 group = group->next; 531 os_free(prev); 532 } 533 534 os_free(wpa_auth); 535 } 536 537 538 /** 539 * wpa_reconfig - Update WPA authenticator configuration 540 * @wpa_auth: Pointer to WPA authenticator data from wpa_init() 541 * @conf: Configuration for WPA authenticator 542 */ 543 int wpa_reconfig(struct wpa_authenticator *wpa_auth, 544 struct wpa_auth_config *conf) 545 { 546 struct wpa_group *group; 547 if (wpa_auth == NULL) 548 return 0; 549 550 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); 551 if (wpa_auth_gen_wpa_ie(wpa_auth)) { 552 wpa_printf(MSG_ERROR, "Could not generate WPA IE."); 553 return -1; 554 } 555 556 /* 557 * Reinitialize GTK to make sure it is suitable for the new 558 * configuration. 559 */ 560 group = wpa_auth->group; 561 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); 562 group->GInit = TRUE; 563 wpa_group_sm_step(wpa_auth, group); 564 group->GInit = FALSE; 565 wpa_group_sm_step(wpa_auth, group); 566 567 return 0; 568 } 569 570 571 struct wpa_state_machine * 572 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr, 573 const u8 *p2p_dev_addr) 574 { 575 struct wpa_state_machine *sm; 576 577 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 578 return NULL; 579 580 sm = os_zalloc(sizeof(struct wpa_state_machine)); 581 if (sm == NULL) 582 return NULL; 583 os_memcpy(sm->addr, addr, ETH_ALEN); 584 if (p2p_dev_addr) 585 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN); 586 587 sm->wpa_auth = wpa_auth; 588 sm->group = wpa_auth->group; 589 wpa_group_get(sm->wpa_auth, sm->group); 590 591 return sm; 592 } 593 594 595 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth, 596 struct wpa_state_machine *sm) 597 { 598 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 599 return -1; 600 601 #ifdef CONFIG_IEEE80211R 602 if (sm->ft_completed) { 603 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 604 "FT authentication already completed - do not " 605 "start 4-way handshake"); 606 /* Go to PTKINITDONE state to allow GTK rekeying */ 607 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE; 608 return 0; 609 } 610 #endif /* CONFIG_IEEE80211R */ 611 612 if (sm->started) { 613 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); 614 sm->ReAuthenticationRequest = TRUE; 615 return wpa_sm_step(sm); 616 } 617 618 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 619 "start authentication"); 620 sm->started = 1; 621 622 sm->Init = TRUE; 623 if (wpa_sm_step(sm) == 1) 624 return 1; /* should not really happen */ 625 sm->Init = FALSE; 626 sm->AuthenticationRequest = TRUE; 627 return wpa_sm_step(sm); 628 } 629 630 631 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) 632 { 633 /* WPA/RSN was not used - clear WPA state. This is needed if the STA 634 * reassociates back to the same AP while the previous entry for the 635 * STA has not yet been removed. */ 636 if (sm == NULL) 637 return; 638 639 sm->wpa_key_mgmt = 0; 640 } 641 642 643 static void wpa_free_sta_sm(struct wpa_state_machine *sm) 644 { 645 #ifdef CONFIG_P2P 646 if (WPA_GET_BE32(sm->ip_addr)) { 647 u32 start; 648 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP " 649 "address %u.%u.%u.%u from " MACSTR, 650 sm->ip_addr[0], sm->ip_addr[1], 651 sm->ip_addr[2], sm->ip_addr[3], 652 MAC2STR(sm->addr)); 653 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start); 654 bitfield_clear(sm->wpa_auth->ip_pool, 655 WPA_GET_BE32(sm->ip_addr) - start); 656 } 657 #endif /* CONFIG_P2P */ 658 if (sm->GUpdateStationKeys) { 659 sm->group->GKeyDoneStations--; 660 sm->GUpdateStationKeys = FALSE; 661 } 662 #ifdef CONFIG_IEEE80211R 663 os_free(sm->assoc_resp_ftie); 664 wpabuf_free(sm->ft_pending_req_ies); 665 #endif /* CONFIG_IEEE80211R */ 666 os_free(sm->last_rx_eapol_key); 667 os_free(sm->wpa_ie); 668 wpa_group_put(sm->wpa_auth, sm->group); 669 os_free(sm); 670 } 671 672 673 void wpa_auth_sta_deinit(struct wpa_state_machine *sm) 674 { 675 if (sm == NULL) 676 return; 677 678 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { 679 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 680 "strict rekeying - force GTK rekey since STA " 681 "is leaving"); 682 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); 683 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, 684 NULL); 685 } 686 687 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 688 sm->pending_1_of_4_timeout = 0; 689 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); 690 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 691 if (sm->in_step_loop) { 692 /* Must not free state machine while wpa_sm_step() is running. 693 * Freeing will be completed in the end of wpa_sm_step(). */ 694 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " 695 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 696 sm->pending_deinit = 1; 697 } else 698 wpa_free_sta_sm(sm); 699 } 700 701 702 static void wpa_request_new_ptk(struct wpa_state_machine *sm) 703 { 704 if (sm == NULL) 705 return; 706 707 sm->PTKRequest = TRUE; 708 sm->PTK_valid = 0; 709 } 710 711 712 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, 713 const u8 *replay_counter) 714 { 715 int i; 716 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 717 if (!ctr[i].valid) 718 break; 719 if (os_memcmp(replay_counter, ctr[i].counter, 720 WPA_REPLAY_COUNTER_LEN) == 0) 721 return 1; 722 } 723 return 0; 724 } 725 726 727 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, 728 const u8 *replay_counter) 729 { 730 int i; 731 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 732 if (ctr[i].valid && 733 (replay_counter == NULL || 734 os_memcmp(replay_counter, ctr[i].counter, 735 WPA_REPLAY_COUNTER_LEN) == 0)) 736 ctr[i].valid = FALSE; 737 } 738 } 739 740 741 #ifdef CONFIG_IEEE80211R 742 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, 743 struct wpa_state_machine *sm, 744 struct wpa_eapol_ie_parse *kde) 745 { 746 struct wpa_ie_data ie; 747 struct rsn_mdie *mdie; 748 749 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || 750 ie.num_pmkid != 1 || ie.pmkid == NULL) { 751 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " 752 "FT 4-way handshake message 2/4"); 753 return -1; 754 } 755 756 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); 757 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", 758 sm->sup_pmk_r1_name, PMKID_LEN); 759 760 if (!kde->mdie || !kde->ftie) { 761 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " 762 "message 2/4", kde->mdie ? "FTIE" : "MDIE"); 763 return -1; 764 } 765 766 mdie = (struct rsn_mdie *) (kde->mdie + 2); 767 if (kde->mdie[1] < sizeof(struct rsn_mdie) || 768 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, 769 MOBILITY_DOMAIN_ID_LEN) != 0) { 770 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); 771 return -1; 772 } 773 774 if (sm->assoc_resp_ftie && 775 (kde->ftie[1] != sm->assoc_resp_ftie[1] || 776 os_memcmp(kde->ftie, sm->assoc_resp_ftie, 777 2 + sm->assoc_resp_ftie[1]) != 0)) { 778 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); 779 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", 780 kde->ftie, kde->ftie_len); 781 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", 782 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); 783 return -1; 784 } 785 786 return 0; 787 } 788 #endif /* CONFIG_IEEE80211R */ 789 790 791 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth, 792 struct wpa_state_machine *sm, int group) 793 { 794 /* Supplicant reported a Michael MIC error */ 795 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 796 "received EAPOL-Key Error Request " 797 "(STA detected Michael MIC failure (group=%d))", 798 group); 799 800 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { 801 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 802 "ignore Michael MIC failure report since " 803 "group cipher is not TKIP"); 804 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { 805 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 806 "ignore Michael MIC failure report since " 807 "pairwise cipher is not TKIP"); 808 } else { 809 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0) 810 return 1; /* STA entry was removed */ 811 sm->dot11RSNAStatsTKIPRemoteMICFailures++; 812 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; 813 } 814 815 /* 816 * Error report is not a request for a new key handshake, but since 817 * Authenticator may do it, let's change the keys now anyway. 818 */ 819 wpa_request_new_ptk(sm); 820 return 0; 821 } 822 823 824 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data, 825 size_t data_len) 826 { 827 struct wpa_ptk PTK; 828 int ok = 0; 829 const u8 *pmk = NULL; 830 831 for (;;) { 832 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 833 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 834 sm->p2p_dev_addr, pmk); 835 if (pmk == NULL) 836 break; 837 } else 838 pmk = sm->PMK; 839 840 wpa_derive_ptk(sm, sm->alt_SNonce, pmk, &PTK); 841 842 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len) 843 == 0) { 844 ok = 1; 845 break; 846 } 847 848 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 849 break; 850 } 851 852 if (!ok) { 853 wpa_printf(MSG_DEBUG, 854 "WPA: Earlier SNonce did not result in matching MIC"); 855 return -1; 856 } 857 858 wpa_printf(MSG_DEBUG, 859 "WPA: Earlier SNonce resulted in matching MIC"); 860 sm->alt_snonce_valid = 0; 861 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN); 862 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 863 sm->PTK_valid = TRUE; 864 865 return 0; 866 } 867 868 869 void wpa_receive(struct wpa_authenticator *wpa_auth, 870 struct wpa_state_machine *sm, 871 u8 *data, size_t data_len) 872 { 873 struct ieee802_1x_hdr *hdr; 874 struct wpa_eapol_key *key; 875 struct wpa_eapol_key_192 *key192; 876 u16 key_info, key_data_length; 877 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, 878 SMK_M1, SMK_M3, SMK_ERROR } msg; 879 char *msgtxt; 880 struct wpa_eapol_ie_parse kde; 881 int ft; 882 const u8 *eapol_key_ie, *key_data; 883 size_t eapol_key_ie_len, keyhdrlen, mic_len; 884 885 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) 886 return; 887 888 mic_len = wpa_mic_len(sm->wpa_key_mgmt); 889 keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key); 890 891 if (data_len < sizeof(*hdr) + keyhdrlen) 892 return; 893 894 hdr = (struct ieee802_1x_hdr *) data; 895 key = (struct wpa_eapol_key *) (hdr + 1); 896 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 897 key_info = WPA_GET_BE16(key->key_info); 898 if (mic_len == 24) { 899 key_data = (const u8 *) (key192 + 1); 900 key_data_length = WPA_GET_BE16(key192->key_data_length); 901 } else { 902 key_data = (const u8 *) (key + 1); 903 key_data_length = WPA_GET_BE16(key->key_data_length); 904 } 905 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR 906 " key_info=0x%x type=%u key_data_length=%u", 907 MAC2STR(sm->addr), key_info, key->type, key_data_length); 908 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) { 909 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " 910 "key_data overflow (%d > %lu)", 911 key_data_length, 912 (unsigned long) (data_len - sizeof(*hdr) - 913 keyhdrlen)); 914 return; 915 } 916 917 if (sm->wpa == WPA_VERSION_WPA2) { 918 if (key->type == EAPOL_KEY_TYPE_WPA) { 919 /* 920 * Some deployed station implementations seem to send 921 * msg 4/4 with incorrect type value in WPA2 mode. 922 */ 923 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " 924 "with unexpected WPA type in RSN mode"); 925 } else if (key->type != EAPOL_KEY_TYPE_RSN) { 926 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 927 "unexpected type %d in RSN mode", 928 key->type); 929 return; 930 } 931 } else { 932 if (key->type != EAPOL_KEY_TYPE_WPA) { 933 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " 934 "unexpected type %d in WPA mode", 935 key->type); 936 return; 937 } 938 } 939 940 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, 941 WPA_NONCE_LEN); 942 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", 943 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 944 945 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys 946 * are set */ 947 948 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == 949 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { 950 if (key_info & WPA_KEY_INFO_ERROR) { 951 msg = SMK_ERROR; 952 msgtxt = "SMK Error"; 953 } else { 954 msg = SMK_M1; 955 msgtxt = "SMK M1"; 956 } 957 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 958 msg = SMK_M3; 959 msgtxt = "SMK M3"; 960 } else if (key_info & WPA_KEY_INFO_REQUEST) { 961 msg = REQUEST; 962 msgtxt = "Request"; 963 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { 964 msg = GROUP_2; 965 msgtxt = "2/2 Group"; 966 } else if (key_data_length == 0) { 967 msg = PAIRWISE_4; 968 msgtxt = "4/4 Pairwise"; 969 } else { 970 msg = PAIRWISE_2; 971 msgtxt = "2/4 Pairwise"; 972 } 973 974 /* TODO: key_info type validation for PeerKey */ 975 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || 976 msg == GROUP_2) { 977 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 978 if (sm->pairwise == WPA_CIPHER_CCMP || 979 sm->pairwise == WPA_CIPHER_GCMP) { 980 if (wpa_use_aes_cmac(sm) && 981 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN && 982 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) && 983 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 984 wpa_auth_logger(wpa_auth, sm->addr, 985 LOGGER_WARNING, 986 "advertised support for " 987 "AES-128-CMAC, but did not " 988 "use it"); 989 return; 990 } 991 992 if (!wpa_use_aes_cmac(sm) && 993 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 994 wpa_auth_logger(wpa_auth, sm->addr, 995 LOGGER_WARNING, 996 "did not use HMAC-SHA1-AES " 997 "with CCMP/GCMP"); 998 return; 999 } 1000 } 1001 1002 if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) && 1003 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) { 1004 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 1005 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases"); 1006 return; 1007 } 1008 } 1009 1010 if (key_info & WPA_KEY_INFO_REQUEST) { 1011 if (sm->req_replay_counter_used && 1012 os_memcmp(key->replay_counter, sm->req_replay_counter, 1013 WPA_REPLAY_COUNTER_LEN) <= 0) { 1014 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, 1015 "received EAPOL-Key request with " 1016 "replayed counter"); 1017 return; 1018 } 1019 } 1020 1021 if (!(key_info & WPA_KEY_INFO_REQUEST) && 1022 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { 1023 int i; 1024 1025 if (msg == PAIRWISE_2 && 1026 wpa_replay_counter_valid(sm->prev_key_replay, 1027 key->replay_counter) && 1028 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 1029 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) 1030 { 1031 /* 1032 * Some supplicant implementations (e.g., Windows XP 1033 * WZC) update SNonce for each EAPOL-Key 2/4. This 1034 * breaks the workaround on accepting any of the 1035 * pending requests, so allow the SNonce to be updated 1036 * even if we have already sent out EAPOL-Key 3/4. 1037 */ 1038 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1039 "Process SNonce update from STA " 1040 "based on retransmitted EAPOL-Key " 1041 "1/4"); 1042 sm->update_snonce = 1; 1043 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN); 1044 sm->alt_snonce_valid = TRUE; 1045 os_memcpy(sm->alt_replay_counter, 1046 sm->key_replay[0].counter, 1047 WPA_REPLAY_COUNTER_LEN); 1048 goto continue_processing; 1049 } 1050 1051 if (msg == PAIRWISE_4 && sm->alt_snonce_valid && 1052 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && 1053 os_memcmp(key->replay_counter, sm->alt_replay_counter, 1054 WPA_REPLAY_COUNTER_LEN) == 0) { 1055 /* 1056 * Supplicant may still be using the old SNonce since 1057 * there was two EAPOL-Key 2/4 messages and they had 1058 * different SNonce values. 1059 */ 1060 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1061 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4"); 1062 goto continue_processing; 1063 } 1064 1065 if (msg == PAIRWISE_2 && 1066 wpa_replay_counter_valid(sm->prev_key_replay, 1067 key->replay_counter) && 1068 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { 1069 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1070 "ignore retransmitted EAPOL-Key %s - " 1071 "SNonce did not change", msgtxt); 1072 } else { 1073 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1074 "received EAPOL-Key %s with " 1075 "unexpected replay counter", msgtxt); 1076 } 1077 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { 1078 if (!sm->key_replay[i].valid) 1079 break; 1080 wpa_hexdump(MSG_DEBUG, "pending replay counter", 1081 sm->key_replay[i].counter, 1082 WPA_REPLAY_COUNTER_LEN); 1083 } 1084 wpa_hexdump(MSG_DEBUG, "received replay counter", 1085 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1086 return; 1087 } 1088 1089 continue_processing: 1090 switch (msg) { 1091 case PAIRWISE_2: 1092 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && 1093 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && 1094 (!sm->update_snonce || 1095 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { 1096 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1097 "received EAPOL-Key msg 2/4 in " 1098 "invalid state (%d) - dropped", 1099 sm->wpa_ptk_state); 1100 return; 1101 } 1102 random_add_randomness(key->key_nonce, WPA_NONCE_LEN); 1103 if (sm->group->reject_4way_hs_for_entropy) { 1104 /* 1105 * The system did not have enough entropy to generate 1106 * strong random numbers. Reject the first 4-way 1107 * handshake(s) and collect some entropy based on the 1108 * information from it. Once enough entropy is 1109 * available, the next atempt will trigger GMK/Key 1110 * Counter update and the station will be allowed to 1111 * continue. 1112 */ 1113 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " 1114 "collect more entropy for random number " 1115 "generation"); 1116 random_mark_pool_ready(); 1117 wpa_sta_disconnect(wpa_auth, sm->addr); 1118 return; 1119 } 1120 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) { 1121 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1122 "received EAPOL-Key msg 2/4 with " 1123 "invalid Key Data contents"); 1124 return; 1125 } 1126 if (kde.rsn_ie) { 1127 eapol_key_ie = kde.rsn_ie; 1128 eapol_key_ie_len = kde.rsn_ie_len; 1129 } else if (kde.osen) { 1130 eapol_key_ie = kde.osen; 1131 eapol_key_ie_len = kde.osen_len; 1132 } else { 1133 eapol_key_ie = kde.wpa_ie; 1134 eapol_key_ie_len = kde.wpa_ie_len; 1135 } 1136 ft = sm->wpa == WPA_VERSION_WPA2 && 1137 wpa_key_mgmt_ft(sm->wpa_key_mgmt); 1138 if (sm->wpa_ie == NULL || 1139 wpa_compare_rsn_ie(ft, 1140 sm->wpa_ie, sm->wpa_ie_len, 1141 eapol_key_ie, eapol_key_ie_len)) { 1142 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1143 "WPA IE from (Re)AssocReq did not " 1144 "match with msg 2/4"); 1145 if (sm->wpa_ie) { 1146 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", 1147 sm->wpa_ie, sm->wpa_ie_len); 1148 } 1149 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", 1150 eapol_key_ie, eapol_key_ie_len); 1151 /* MLME-DEAUTHENTICATE.request */ 1152 wpa_sta_disconnect(wpa_auth, sm->addr); 1153 return; 1154 } 1155 #ifdef CONFIG_IEEE80211R 1156 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { 1157 wpa_sta_disconnect(wpa_auth, sm->addr); 1158 return; 1159 } 1160 #endif /* CONFIG_IEEE80211R */ 1161 #ifdef CONFIG_P2P 1162 if (kde.ip_addr_req && kde.ip_addr_req[0] && 1163 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) { 1164 int idx; 1165 wpa_printf(MSG_DEBUG, "P2P: IP address requested in " 1166 "EAPOL-Key exchange"); 1167 idx = bitfield_get_first_zero(wpa_auth->ip_pool); 1168 if (idx >= 0) { 1169 u32 start = WPA_GET_BE32(wpa_auth->conf. 1170 ip_addr_start); 1171 bitfield_set(wpa_auth->ip_pool, idx); 1172 WPA_PUT_BE32(sm->ip_addr, start + idx); 1173 wpa_printf(MSG_DEBUG, "P2P: Assigned IP " 1174 "address %u.%u.%u.%u to " MACSTR, 1175 sm->ip_addr[0], sm->ip_addr[1], 1176 sm->ip_addr[2], sm->ip_addr[3], 1177 MAC2STR(sm->addr)); 1178 } 1179 } 1180 #endif /* CONFIG_P2P */ 1181 break; 1182 case PAIRWISE_4: 1183 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || 1184 !sm->PTK_valid) { 1185 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1186 "received EAPOL-Key msg 4/4 in " 1187 "invalid state (%d) - dropped", 1188 sm->wpa_ptk_state); 1189 return; 1190 } 1191 break; 1192 case GROUP_2: 1193 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING 1194 || !sm->PTK_valid) { 1195 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, 1196 "received EAPOL-Key msg 2/2 in " 1197 "invalid state (%d) - dropped", 1198 sm->wpa_ptk_group_state); 1199 return; 1200 } 1201 break; 1202 #ifdef CONFIG_PEERKEY 1203 case SMK_M1: 1204 case SMK_M3: 1205 case SMK_ERROR: 1206 if (!wpa_auth->conf.peerkey) { 1207 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " 1208 "PeerKey use disabled - ignoring message"); 1209 return; 1210 } 1211 if (!sm->PTK_valid) { 1212 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1213 "received EAPOL-Key msg SMK in " 1214 "invalid state - dropped"); 1215 return; 1216 } 1217 break; 1218 #else /* CONFIG_PEERKEY */ 1219 case SMK_M1: 1220 case SMK_M3: 1221 case SMK_ERROR: 1222 return; /* STSL disabled - ignore SMK messages */ 1223 #endif /* CONFIG_PEERKEY */ 1224 case REQUEST: 1225 break; 1226 } 1227 1228 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 1229 "received EAPOL-Key frame (%s)", msgtxt); 1230 1231 if (key_info & WPA_KEY_INFO_ACK) { 1232 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1233 "received invalid EAPOL-Key: Key Ack set"); 1234 return; 1235 } 1236 1237 if (!(key_info & WPA_KEY_INFO_MIC)) { 1238 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1239 "received invalid EAPOL-Key: Key MIC not set"); 1240 return; 1241 } 1242 1243 sm->MICVerified = FALSE; 1244 if (sm->PTK_valid && !sm->update_snonce) { 1245 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data, 1246 data_len) && 1247 (msg != PAIRWISE_4 || !sm->alt_snonce_valid || 1248 wpa_try_alt_snonce(sm, data, data_len))) { 1249 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1250 "received EAPOL-Key with invalid MIC"); 1251 return; 1252 } 1253 sm->MICVerified = TRUE; 1254 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 1255 sm->pending_1_of_4_timeout = 0; 1256 } 1257 1258 if (key_info & WPA_KEY_INFO_REQUEST) { 1259 if (sm->MICVerified) { 1260 sm->req_replay_counter_used = 1; 1261 os_memcpy(sm->req_replay_counter, key->replay_counter, 1262 WPA_REPLAY_COUNTER_LEN); 1263 } else { 1264 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1265 "received EAPOL-Key request with " 1266 "invalid MIC"); 1267 return; 1268 } 1269 1270 /* 1271 * TODO: should decrypt key data field if encryption was used; 1272 * even though MAC address KDE is not normally encrypted, 1273 * supplicant is allowed to encrypt it. 1274 */ 1275 if (msg == SMK_ERROR) { 1276 #ifdef CONFIG_PEERKEY 1277 wpa_smk_error(wpa_auth, sm, key_data, key_data_length); 1278 #endif /* CONFIG_PEERKEY */ 1279 return; 1280 } else if (key_info & WPA_KEY_INFO_ERROR) { 1281 if (wpa_receive_error_report( 1282 wpa_auth, sm, 1283 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0) 1284 return; /* STA entry was removed */ 1285 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1286 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1287 "received EAPOL-Key Request for new " 1288 "4-Way Handshake"); 1289 wpa_request_new_ptk(sm); 1290 #ifdef CONFIG_PEERKEY 1291 } else if (msg == SMK_M1) { 1292 wpa_smk_m1(wpa_auth, sm, key, key_data, 1293 key_data_length); 1294 #endif /* CONFIG_PEERKEY */ 1295 } else if (key_data_length > 0 && 1296 wpa_parse_kde_ies(key_data, key_data_length, 1297 &kde) == 0 && 1298 kde.mac_addr) { 1299 } else { 1300 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1301 "received EAPOL-Key Request for GTK " 1302 "rekeying"); 1303 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); 1304 wpa_rekey_gtk(wpa_auth, NULL); 1305 } 1306 } else { 1307 /* Do not allow the same key replay counter to be reused. */ 1308 wpa_replay_counter_mark_invalid(sm->key_replay, 1309 key->replay_counter); 1310 1311 if (msg == PAIRWISE_2) { 1312 /* 1313 * Maintain a copy of the pending EAPOL-Key frames in 1314 * case the EAPOL-Key frame was retransmitted. This is 1315 * needed to allow EAPOL-Key msg 2/4 reply to another 1316 * pending msg 1/4 to update the SNonce to work around 1317 * unexpected supplicant behavior. 1318 */ 1319 os_memcpy(sm->prev_key_replay, sm->key_replay, 1320 sizeof(sm->key_replay)); 1321 } else { 1322 os_memset(sm->prev_key_replay, 0, 1323 sizeof(sm->prev_key_replay)); 1324 } 1325 1326 /* 1327 * Make sure old valid counters are not accepted anymore and 1328 * do not get copied again. 1329 */ 1330 wpa_replay_counter_mark_invalid(sm->key_replay, NULL); 1331 } 1332 1333 #ifdef CONFIG_PEERKEY 1334 if (msg == SMK_M3) { 1335 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length); 1336 return; 1337 } 1338 #endif /* CONFIG_PEERKEY */ 1339 1340 os_free(sm->last_rx_eapol_key); 1341 sm->last_rx_eapol_key = os_malloc(data_len); 1342 if (sm->last_rx_eapol_key == NULL) 1343 return; 1344 os_memcpy(sm->last_rx_eapol_key, data, data_len); 1345 sm->last_rx_eapol_key_len = data_len; 1346 1347 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); 1348 sm->EAPOLKeyReceived = TRUE; 1349 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1350 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); 1351 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); 1352 wpa_sm_step(sm); 1353 } 1354 1355 1356 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, 1357 const u8 *gnonce, u8 *gtk, size_t gtk_len) 1358 { 1359 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; 1360 u8 *pos; 1361 int ret = 0; 1362 1363 /* GTK = PRF-X(GMK, "Group key expansion", 1364 * AA || GNonce || Time || random data) 1365 * The example described in the IEEE 802.11 standard uses only AA and 1366 * GNonce as inputs here. Add some more entropy since this derivation 1367 * is done only at the Authenticator and as such, does not need to be 1368 * exactly same. 1369 */ 1370 os_memcpy(data, addr, ETH_ALEN); 1371 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); 1372 pos = data + ETH_ALEN + WPA_NONCE_LEN; 1373 wpa_get_ntp_timestamp(pos); 1374 pos += 8; 1375 if (random_get_bytes(pos, 16) < 0) 1376 ret = -1; 1377 1378 #ifdef CONFIG_IEEE80211W 1379 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); 1380 #else /* CONFIG_IEEE80211W */ 1381 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) 1382 < 0) 1383 ret = -1; 1384 #endif /* CONFIG_IEEE80211W */ 1385 1386 return ret; 1387 } 1388 1389 1390 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) 1391 { 1392 struct wpa_authenticator *wpa_auth = eloop_ctx; 1393 struct wpa_state_machine *sm = timeout_ctx; 1394 1395 sm->pending_1_of_4_timeout = 0; 1396 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); 1397 sm->TimeoutEvt = TRUE; 1398 wpa_sm_step(sm); 1399 } 1400 1401 1402 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1403 struct wpa_state_machine *sm, int key_info, 1404 const u8 *key_rsc, const u8 *nonce, 1405 const u8 *kde, size_t kde_len, 1406 int keyidx, int encr, int force_version) 1407 { 1408 struct ieee802_1x_hdr *hdr; 1409 struct wpa_eapol_key *key; 1410 struct wpa_eapol_key_192 *key192; 1411 size_t len, mic_len, keyhdrlen; 1412 int alg; 1413 int key_data_len, pad_len = 0; 1414 u8 *buf, *pos; 1415 int version, pairwise; 1416 int i; 1417 u8 *key_data; 1418 1419 mic_len = wpa_mic_len(sm->wpa_key_mgmt); 1420 keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key); 1421 1422 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen; 1423 1424 if (force_version) 1425 version = force_version; 1426 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1427 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) 1428 version = WPA_KEY_INFO_TYPE_AKM_DEFINED; 1429 else if (wpa_use_aes_cmac(sm)) 1430 version = WPA_KEY_INFO_TYPE_AES_128_CMAC; 1431 else if (sm->pairwise != WPA_CIPHER_TKIP) 1432 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 1433 else 1434 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 1435 1436 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); 1437 1438 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " 1439 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " 1440 "encr=%d)", 1441 version, 1442 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, 1443 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, 1444 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, 1445 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, 1446 pairwise, (unsigned long) kde_len, keyidx, encr); 1447 1448 key_data_len = kde_len; 1449 1450 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1451 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1452 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) || 1453 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { 1454 pad_len = key_data_len % 8; 1455 if (pad_len) 1456 pad_len = 8 - pad_len; 1457 key_data_len += pad_len + 8; 1458 } 1459 1460 len += key_data_len; 1461 1462 hdr = os_zalloc(len); 1463 if (hdr == NULL) 1464 return; 1465 hdr->version = wpa_auth->conf.eapol_version; 1466 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; 1467 hdr->length = host_to_be16(len - sizeof(*hdr)); 1468 key = (struct wpa_eapol_key *) (hdr + 1); 1469 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 1470 key_data = ((u8 *) (hdr + 1)) + keyhdrlen; 1471 1472 key->type = sm->wpa == WPA_VERSION_WPA2 ? 1473 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1474 key_info |= version; 1475 if (encr && sm->wpa == WPA_VERSION_WPA2) 1476 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1477 if (sm->wpa != WPA_VERSION_WPA2) 1478 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; 1479 WPA_PUT_BE16(key->key_info, key_info); 1480 1481 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; 1482 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); 1483 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) 1484 WPA_PUT_BE16(key->key_length, 0); 1485 1486 /* FIX: STSL: what to use as key_replay_counter? */ 1487 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { 1488 sm->key_replay[i].valid = sm->key_replay[i - 1].valid; 1489 os_memcpy(sm->key_replay[i].counter, 1490 sm->key_replay[i - 1].counter, 1491 WPA_REPLAY_COUNTER_LEN); 1492 } 1493 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); 1494 os_memcpy(key->replay_counter, sm->key_replay[0].counter, 1495 WPA_REPLAY_COUNTER_LEN); 1496 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", 1497 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1498 sm->key_replay[0].valid = TRUE; 1499 1500 if (nonce) 1501 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); 1502 1503 if (key_rsc) 1504 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); 1505 1506 if (kde && !encr) { 1507 os_memcpy(key_data, kde, kde_len); 1508 if (mic_len == 24) 1509 WPA_PUT_BE16(key192->key_data_length, kde_len); 1510 else 1511 WPA_PUT_BE16(key->key_data_length, kde_len); 1512 } else if (encr && kde) { 1513 buf = os_zalloc(key_data_len); 1514 if (buf == NULL) { 1515 os_free(hdr); 1516 return; 1517 } 1518 pos = buf; 1519 os_memcpy(pos, kde, kde_len); 1520 pos += kde_len; 1521 1522 if (pad_len) 1523 *pos++ = 0xdd; 1524 1525 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", 1526 buf, key_data_len); 1527 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1528 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN || 1529 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) || 1530 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1531 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, 1532 (key_data_len - 8) / 8, buf, key_data)) { 1533 os_free(hdr); 1534 os_free(buf); 1535 return; 1536 } 1537 if (mic_len == 24) 1538 WPA_PUT_BE16(key192->key_data_length, 1539 key_data_len); 1540 else 1541 WPA_PUT_BE16(key->key_data_length, 1542 key_data_len); 1543 #ifndef CONFIG_NO_RC4 1544 } else if (sm->PTK.kek_len == 16) { 1545 u8 ek[32]; 1546 os_memcpy(key->key_iv, 1547 sm->group->Counter + WPA_NONCE_LEN - 16, 16); 1548 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); 1549 os_memcpy(ek, key->key_iv, 16); 1550 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len); 1551 os_memcpy(key_data, buf, key_data_len); 1552 rc4_skip(ek, 32, 256, key_data, key_data_len); 1553 if (mic_len == 24) 1554 WPA_PUT_BE16(key192->key_data_length, 1555 key_data_len); 1556 else 1557 WPA_PUT_BE16(key->key_data_length, 1558 key_data_len); 1559 #endif /* CONFIG_NO_RC4 */ 1560 } else { 1561 os_free(hdr); 1562 os_free(buf); 1563 return; 1564 } 1565 os_free(buf); 1566 } 1567 1568 if (key_info & WPA_KEY_INFO_MIC) { 1569 u8 *key_mic; 1570 1571 if (!sm->PTK_valid) { 1572 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 1573 "PTK not valid when sending EAPOL-Key " 1574 "frame"); 1575 os_free(hdr); 1576 return; 1577 } 1578 1579 key_mic = key192->key_mic; /* same offset for key and key192 */ 1580 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len, 1581 sm->wpa_key_mgmt, version, 1582 (u8 *) hdr, len, key_mic); 1583 #ifdef CONFIG_TESTING_OPTIONS 1584 if (!pairwise && 1585 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 && 1586 drand48() < 1587 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { 1588 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, 1589 "Corrupting group EAPOL-Key Key MIC"); 1590 key_mic[0]++; 1591 } 1592 #endif /* CONFIG_TESTING_OPTIONS */ 1593 } 1594 1595 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, 1596 1); 1597 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, 1598 sm->pairwise_set); 1599 os_free(hdr); 1600 } 1601 1602 1603 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, 1604 struct wpa_state_machine *sm, int key_info, 1605 const u8 *key_rsc, const u8 *nonce, 1606 const u8 *kde, size_t kde_len, 1607 int keyidx, int encr) 1608 { 1609 int timeout_ms; 1610 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; 1611 int ctr; 1612 1613 if (sm == NULL) 1614 return; 1615 1616 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, 1617 keyidx, encr, 0); 1618 1619 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; 1620 if (ctr == 1 && wpa_auth->conf.tx_status) 1621 timeout_ms = pairwise ? eapol_key_timeout_first : 1622 eapol_key_timeout_first_group; 1623 else 1624 timeout_ms = eapol_key_timeout_subseq; 1625 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) 1626 sm->pending_1_of_4_timeout = 1; 1627 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " 1628 "counter %d)", timeout_ms, ctr); 1629 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, 1630 wpa_send_eapol_timeout, wpa_auth, sm); 1631 } 1632 1633 1634 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data, 1635 size_t data_len) 1636 { 1637 struct ieee802_1x_hdr *hdr; 1638 struct wpa_eapol_key *key; 1639 struct wpa_eapol_key_192 *key192; 1640 u16 key_info; 1641 int ret = 0; 1642 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1643 size_t mic_len = wpa_mic_len(akmp); 1644 1645 if (data_len < sizeof(*hdr) + sizeof(*key)) 1646 return -1; 1647 1648 hdr = (struct ieee802_1x_hdr *) data; 1649 key = (struct wpa_eapol_key *) (hdr + 1); 1650 key192 = (struct wpa_eapol_key_192 *) (hdr + 1); 1651 key_info = WPA_GET_BE16(key->key_info); 1652 os_memcpy(mic, key192->key_mic, mic_len); 1653 os_memset(key192->key_mic, 0, mic_len); 1654 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp, 1655 key_info & WPA_KEY_INFO_TYPE_MASK, 1656 data, data_len, key192->key_mic) || 1657 os_memcmp_const(mic, key192->key_mic, mic_len) != 0) 1658 ret = -1; 1659 os_memcpy(key192->key_mic, mic, mic_len); 1660 return ret; 1661 } 1662 1663 1664 void wpa_remove_ptk(struct wpa_state_machine *sm) 1665 { 1666 sm->PTK_valid = FALSE; 1667 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1668 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); 1669 sm->pairwise_set = FALSE; 1670 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 1671 } 1672 1673 1674 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event) 1675 { 1676 int remove_ptk = 1; 1677 1678 if (sm == NULL) 1679 return -1; 1680 1681 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1682 "event %d notification", event); 1683 1684 switch (event) { 1685 case WPA_AUTH: 1686 #ifdef CONFIG_MESH 1687 /* PTKs are derived through AMPE */ 1688 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) { 1689 /* not mesh */ 1690 break; 1691 } 1692 return 0; 1693 #endif /* CONFIG_MESH */ 1694 case WPA_ASSOC: 1695 break; 1696 case WPA_DEAUTH: 1697 case WPA_DISASSOC: 1698 sm->DeauthenticationRequest = TRUE; 1699 break; 1700 case WPA_REAUTH: 1701 case WPA_REAUTH_EAPOL: 1702 if (!sm->started) { 1703 /* 1704 * When using WPS, we may end up here if the STA 1705 * manages to re-associate without the previous STA 1706 * entry getting removed. Consequently, we need to make 1707 * sure that the WPA state machines gets initialized 1708 * properly at this point. 1709 */ 1710 wpa_printf(MSG_DEBUG, "WPA state machine had not been " 1711 "started - initialize now"); 1712 sm->started = 1; 1713 sm->Init = TRUE; 1714 if (wpa_sm_step(sm) == 1) 1715 return 1; /* should not really happen */ 1716 sm->Init = FALSE; 1717 sm->AuthenticationRequest = TRUE; 1718 break; 1719 } 1720 if (sm->GUpdateStationKeys) { 1721 /* 1722 * Reauthentication cancels the pending group key 1723 * update for this STA. 1724 */ 1725 sm->group->GKeyDoneStations--; 1726 sm->GUpdateStationKeys = FALSE; 1727 sm->PtkGroupInit = TRUE; 1728 } 1729 sm->ReAuthenticationRequest = TRUE; 1730 break; 1731 case WPA_ASSOC_FT: 1732 #ifdef CONFIG_IEEE80211R 1733 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " 1734 "after association"); 1735 wpa_ft_install_ptk(sm); 1736 1737 /* Using FT protocol, not WPA auth state machine */ 1738 sm->ft_completed = 1; 1739 return 0; 1740 #else /* CONFIG_IEEE80211R */ 1741 break; 1742 #endif /* CONFIG_IEEE80211R */ 1743 } 1744 1745 #ifdef CONFIG_IEEE80211R 1746 sm->ft_completed = 0; 1747 #endif /* CONFIG_IEEE80211R */ 1748 1749 #ifdef CONFIG_IEEE80211W 1750 if (sm->mgmt_frame_prot && event == WPA_AUTH) 1751 remove_ptk = 0; 1752 #endif /* CONFIG_IEEE80211W */ 1753 1754 if (remove_ptk) { 1755 sm->PTK_valid = FALSE; 1756 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1757 1758 if (event != WPA_REAUTH_EAPOL) 1759 wpa_remove_ptk(sm); 1760 } 1761 1762 if (sm->in_step_loop) { 1763 /* 1764 * wpa_sm_step() is already running - avoid recursive call to 1765 * it by making the existing loop process the new update. 1766 */ 1767 sm->changed = TRUE; 1768 return 0; 1769 } 1770 return wpa_sm_step(sm); 1771 } 1772 1773 1774 SM_STATE(WPA_PTK, INITIALIZE) 1775 { 1776 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); 1777 if (sm->Init) { 1778 /* Init flag is not cleared here, so avoid busy 1779 * loop by claiming nothing changed. */ 1780 sm->changed = FALSE; 1781 } 1782 1783 sm->keycount = 0; 1784 if (sm->GUpdateStationKeys) 1785 sm->group->GKeyDoneStations--; 1786 sm->GUpdateStationKeys = FALSE; 1787 if (sm->wpa == WPA_VERSION_WPA) 1788 sm->PInitAKeys = FALSE; 1789 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and 1790 * Local AA > Remote AA)) */) { 1791 sm->Pair = TRUE; 1792 } 1793 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); 1794 wpa_remove_ptk(sm); 1795 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); 1796 sm->TimeoutCtr = 0; 1797 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 1798 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 1799 WPA_EAPOL_authorized, 0); 1800 } 1801 } 1802 1803 1804 SM_STATE(WPA_PTK, DISCONNECT) 1805 { 1806 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); 1807 sm->Disconnect = FALSE; 1808 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 1809 } 1810 1811 1812 SM_STATE(WPA_PTK, DISCONNECTED) 1813 { 1814 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); 1815 sm->DeauthenticationRequest = FALSE; 1816 } 1817 1818 1819 SM_STATE(WPA_PTK, AUTHENTICATION) 1820 { 1821 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); 1822 os_memset(&sm->PTK, 0, sizeof(sm->PTK)); 1823 sm->PTK_valid = FALSE; 1824 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, 1825 1); 1826 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); 1827 sm->AuthenticationRequest = FALSE; 1828 } 1829 1830 1831 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, 1832 struct wpa_group *group) 1833 { 1834 if (group->first_sta_seen) 1835 return; 1836 /* 1837 * System has run bit further than at the time hostapd was started 1838 * potentially very early during boot up. This provides better chances 1839 * of collecting more randomness on embedded systems. Re-initialize the 1840 * GMK and Counter here to improve their strength if there was not 1841 * enough entropy available immediately after system startup. 1842 */ 1843 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " 1844 "station"); 1845 if (random_pool_ready() != 1) { 1846 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " 1847 "to proceed - reject first 4-way handshake"); 1848 group->reject_4way_hs_for_entropy = TRUE; 1849 } else { 1850 group->first_sta_seen = TRUE; 1851 group->reject_4way_hs_for_entropy = FALSE; 1852 } 1853 1854 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 || 1855 wpa_gtk_update(wpa_auth, group) < 0 || 1856 wpa_group_config_group_keys(wpa_auth, group) < 0) { 1857 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed"); 1858 group->first_sta_seen = FALSE; 1859 group->reject_4way_hs_for_entropy = TRUE; 1860 } 1861 } 1862 1863 1864 SM_STATE(WPA_PTK, AUTHENTICATION2) 1865 { 1866 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); 1867 1868 wpa_group_ensure_init(sm->wpa_auth, sm->group); 1869 sm->ReAuthenticationRequest = FALSE; 1870 1871 /* 1872 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat 1873 * ambiguous. The Authenticator state machine uses a counter that is 1874 * incremented by one for each 4-way handshake. However, the security 1875 * analysis of 4-way handshake points out that unpredictable nonces 1876 * help in preventing precomputation attacks. Instead of the state 1877 * machine definition, use an unpredictable nonce value here to provide 1878 * stronger protection against potential precomputation attacks. 1879 */ 1880 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1881 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " 1882 "ANonce."); 1883 sm->Disconnect = TRUE; 1884 return; 1885 } 1886 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, 1887 WPA_NONCE_LEN); 1888 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more 1889 * logical place than INITIALIZE since AUTHENTICATION2 can be 1890 * re-entered on ReAuthenticationRequest without going through 1891 * INITIALIZE. */ 1892 sm->TimeoutCtr = 0; 1893 } 1894 1895 1896 static int wpa_auth_sm_ptk_update(struct wpa_state_machine *sm) 1897 { 1898 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1899 wpa_printf(MSG_ERROR, 1900 "WPA: Failed to get random data for ANonce"); 1901 sm->Disconnect = TRUE; 1902 return -1; 1903 } 1904 wpa_hexdump(MSG_DEBUG, "WPA: Assign new ANonce", sm->ANonce, 1905 WPA_NONCE_LEN); 1906 sm->TimeoutCtr = 0; 1907 return 0; 1908 } 1909 1910 1911 SM_STATE(WPA_PTK, INITPMK) 1912 { 1913 u8 msk[2 * PMK_LEN]; 1914 size_t len = 2 * PMK_LEN; 1915 1916 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); 1917 #ifdef CONFIG_IEEE80211R 1918 sm->xxkey_len = 0; 1919 #endif /* CONFIG_IEEE80211R */ 1920 if (sm->pmksa) { 1921 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); 1922 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); 1923 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { 1924 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " 1925 "(len=%lu)", (unsigned long) len); 1926 os_memcpy(sm->PMK, msk, PMK_LEN); 1927 #ifdef CONFIG_IEEE80211R 1928 if (len >= 2 * PMK_LEN) { 1929 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); 1930 sm->xxkey_len = PMK_LEN; 1931 } 1932 #endif /* CONFIG_IEEE80211R */ 1933 } else { 1934 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p", 1935 sm->wpa_auth->cb.get_msk); 1936 sm->Disconnect = TRUE; 1937 return; 1938 } 1939 os_memset(msk, 0, sizeof(msk)); 1940 1941 sm->req_replay_counter_used = 0; 1942 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this 1943 * will break reauthentication since EAPOL state machines may not be 1944 * get into AUTHENTICATING state that clears keyRun before WPA state 1945 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK 1946 * state and takes PMK from the previously used AAA Key. This will 1947 * eventually fail in 4-Way Handshake because Supplicant uses PMK 1948 * derived from the new AAA Key. Setting keyRun = FALSE here seems to 1949 * be good workaround for this issue. */ 1950 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); 1951 } 1952 1953 1954 SM_STATE(WPA_PTK, INITPSK) 1955 { 1956 const u8 *psk; 1957 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); 1958 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL); 1959 if (psk) { 1960 os_memcpy(sm->PMK, psk, PMK_LEN); 1961 #ifdef CONFIG_IEEE80211R 1962 os_memcpy(sm->xxkey, psk, PMK_LEN); 1963 sm->xxkey_len = PMK_LEN; 1964 #endif /* CONFIG_IEEE80211R */ 1965 } 1966 sm->req_replay_counter_used = 0; 1967 } 1968 1969 1970 SM_STATE(WPA_PTK, PTKSTART) 1971 { 1972 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; 1973 size_t pmkid_len = 0; 1974 1975 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); 1976 sm->PTKRequest = FALSE; 1977 sm->TimeoutEvt = FALSE; 1978 sm->alt_snonce_valid = FALSE; 1979 1980 sm->TimeoutCtr++; 1981 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 1982 /* No point in sending the EAPOL-Key - we will disconnect 1983 * immediately following this. */ 1984 return; 1985 } 1986 1987 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 1988 "sending 1/4 msg of 4-Way Handshake"); 1989 /* 1990 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only 1991 * one possible PSK for this STA. 1992 */ 1993 if (sm->wpa == WPA_VERSION_WPA2 && 1994 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 1995 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) { 1996 pmkid = buf; 1997 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 1998 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; 1999 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; 2000 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); 2001 if (sm->pmksa) { 2002 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], 2003 sm->pmksa->pmkid, PMKID_LEN); 2004 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) { 2005 /* No KCK available to derive PMKID */ 2006 pmkid = NULL; 2007 } else { 2008 /* 2009 * Calculate PMKID since no PMKSA cache entry was 2010 * available with pre-calculated PMKID. 2011 */ 2012 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, 2013 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], 2014 wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); 2015 } 2016 } 2017 wpa_send_eapol(sm->wpa_auth, sm, 2018 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, 2019 sm->ANonce, pmkid, pmkid_len, 0, 0); 2020 } 2021 2022 2023 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce, 2024 const u8 *pmk, struct wpa_ptk *ptk) 2025 { 2026 #ifdef CONFIG_IEEE80211R 2027 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 2028 return wpa_auth_derive_ptk_ft(sm, pmk, ptk); 2029 #endif /* CONFIG_IEEE80211R */ 2030 2031 return wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", 2032 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce, 2033 ptk, sm->wpa_key_mgmt, sm->pairwise); 2034 } 2035 2036 2037 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) 2038 { 2039 struct wpa_ptk PTK; 2040 int ok = 0, psk_found = 0; 2041 const u8 *pmk = NULL; 2042 2043 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); 2044 sm->EAPOLKeyReceived = FALSE; 2045 sm->update_snonce = FALSE; 2046 2047 /* WPA with IEEE 802.1X: use the derived PMK from EAP 2048 * WPA-PSK: iterate through possible PSKs and select the one matching 2049 * the packet */ 2050 for (;;) { 2051 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2052 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, 2053 sm->p2p_dev_addr, pmk); 2054 if (pmk == NULL) 2055 break; 2056 psk_found = 1; 2057 } else 2058 pmk = sm->PMK; 2059 2060 wpa_derive_ptk(sm, sm->SNonce, pmk, &PTK); 2061 2062 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, 2063 sm->last_rx_eapol_key, 2064 sm->last_rx_eapol_key_len) == 0) { 2065 ok = 1; 2066 break; 2067 } 2068 2069 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) 2070 break; 2071 } 2072 2073 if (!ok) { 2074 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2075 "invalid MIC in msg 2/4 of 4-Way Handshake"); 2076 if (psk_found) 2077 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr); 2078 return; 2079 } 2080 2081 #ifdef CONFIG_IEEE80211R 2082 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2083 /* 2084 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches 2085 * with the value we derived. 2086 */ 2087 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name, 2088 WPA_PMK_NAME_LEN) != 0) { 2089 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2090 "PMKR1Name mismatch in FT 4-way " 2091 "handshake"); 2092 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " 2093 "Supplicant", 2094 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); 2095 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 2096 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 2097 return; 2098 } 2099 } 2100 #endif /* CONFIG_IEEE80211R */ 2101 2102 sm->pending_1_of_4_timeout = 0; 2103 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); 2104 2105 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2106 /* PSK may have changed from the previous choice, so update 2107 * state machine data based on whatever PSK was selected here. 2108 */ 2109 os_memcpy(sm->PMK, pmk, PMK_LEN); 2110 } 2111 2112 sm->MICVerified = TRUE; 2113 2114 os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); 2115 sm->PTK_valid = TRUE; 2116 } 2117 2118 2119 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) 2120 { 2121 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); 2122 sm->TimeoutCtr = 0; 2123 } 2124 2125 2126 #ifdef CONFIG_IEEE80211W 2127 2128 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 2129 { 2130 if (sm->mgmt_frame_prot) { 2131 size_t len; 2132 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2133 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len; 2134 } 2135 2136 return 0; 2137 } 2138 2139 2140 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 2141 { 2142 struct wpa_igtk_kde igtk; 2143 struct wpa_group *gsm = sm->group; 2144 u8 rsc[WPA_KEY_RSC_LEN]; 2145 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2146 2147 if (!sm->mgmt_frame_prot) 2148 return pos; 2149 2150 igtk.keyid[0] = gsm->GN_igtk; 2151 igtk.keyid[1] = 0; 2152 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || 2153 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0) 2154 os_memset(igtk.pn, 0, sizeof(igtk.pn)); 2155 else 2156 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn)); 2157 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len); 2158 if (sm->wpa_auth->conf.disable_gtk) { 2159 /* 2160 * Provide unique random IGTK to each STA to prevent use of 2161 * IGTK in the BSS. 2162 */ 2163 if (random_get_bytes(igtk.igtk, len) < 0) 2164 return pos; 2165 } 2166 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, 2167 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len, 2168 NULL, 0); 2169 2170 return pos; 2171 } 2172 2173 #else /* CONFIG_IEEE80211W */ 2174 2175 static int ieee80211w_kde_len(struct wpa_state_machine *sm) 2176 { 2177 return 0; 2178 } 2179 2180 2181 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) 2182 { 2183 return pos; 2184 } 2185 2186 #endif /* CONFIG_IEEE80211W */ 2187 2188 2189 SM_STATE(WPA_PTK, PTKINITNEGOTIATING) 2190 { 2191 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; 2192 size_t gtk_len, kde_len; 2193 struct wpa_group *gsm = sm->group; 2194 u8 *wpa_ie; 2195 int wpa_ie_len, secure, keyidx, encr = 0; 2196 2197 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); 2198 sm->TimeoutEvt = FALSE; 2199 2200 sm->TimeoutCtr++; 2201 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { 2202 /* No point in sending the EAPOL-Key - we will disconnect 2203 * immediately following this. */ 2204 return; 2205 } 2206 2207 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], 2208 GTK[GN], IGTK, [FTIE], [TIE * 2]) 2209 */ 2210 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2211 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2212 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ 2213 wpa_ie = sm->wpa_auth->wpa_ie; 2214 wpa_ie_len = sm->wpa_auth->wpa_ie_len; 2215 if (sm->wpa == WPA_VERSION_WPA && 2216 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && 2217 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { 2218 /* WPA-only STA, remove RSN IE and possible MDIE */ 2219 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2220 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN) 2221 wpa_ie = wpa_ie + wpa_ie[1] + 2; 2222 wpa_ie_len = wpa_ie[1] + 2; 2223 } 2224 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2225 "sending 3/4 msg of 4-Way Handshake"); 2226 if (sm->wpa == WPA_VERSION_WPA2) { 2227 /* WPA2 send GTK in the 4-way handshake */ 2228 secure = 1; 2229 gtk = gsm->GTK[gsm->GN - 1]; 2230 gtk_len = gsm->GTK_len; 2231 if (sm->wpa_auth->conf.disable_gtk) { 2232 /* 2233 * Provide unique random GTK to each STA to prevent use 2234 * of GTK in the BSS. 2235 */ 2236 if (random_get_bytes(dummy_gtk, gtk_len) < 0) 2237 return; 2238 gtk = dummy_gtk; 2239 } 2240 keyidx = gsm->GN; 2241 _rsc = rsc; 2242 encr = 1; 2243 } else { 2244 /* WPA does not include GTK in msg 3/4 */ 2245 secure = 0; 2246 gtk = NULL; 2247 gtk_len = 0; 2248 keyidx = 0; 2249 _rsc = NULL; 2250 if (sm->rx_eapol_key_secure) { 2251 /* 2252 * It looks like Windows 7 supplicant tries to use 2253 * Secure bit in msg 2/4 after having reported Michael 2254 * MIC failure and it then rejects the 4-way handshake 2255 * if msg 3/4 does not set Secure bit. Work around this 2256 * by setting the Secure bit here even in the case of 2257 * WPA if the supplicant used it first. 2258 */ 2259 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2260 "STA used Secure bit in WPA msg 2/4 - " 2261 "set Secure for 3/4 as workaround"); 2262 secure = 1; 2263 } 2264 } 2265 2266 kde_len = wpa_ie_len + ieee80211w_kde_len(sm); 2267 if (gtk) 2268 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; 2269 #ifdef CONFIG_IEEE80211R 2270 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2271 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ 2272 kde_len += 300; /* FTIE + 2 * TIE */ 2273 } 2274 #endif /* CONFIG_IEEE80211R */ 2275 #ifdef CONFIG_P2P 2276 if (WPA_GET_BE32(sm->ip_addr) > 0) 2277 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4; 2278 #endif /* CONFIG_P2P */ 2279 kde = os_malloc(kde_len); 2280 if (kde == NULL) 2281 return; 2282 2283 pos = kde; 2284 os_memcpy(pos, wpa_ie, wpa_ie_len); 2285 pos += wpa_ie_len; 2286 #ifdef CONFIG_IEEE80211R 2287 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2288 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); 2289 if (res < 0) { 2290 wpa_printf(MSG_ERROR, "FT: Failed to insert " 2291 "PMKR1Name into RSN IE in EAPOL-Key data"); 2292 os_free(kde); 2293 return; 2294 } 2295 pos += res; 2296 } 2297 #endif /* CONFIG_IEEE80211R */ 2298 if (gtk) { 2299 u8 hdr[2]; 2300 hdr[0] = keyidx & 0x03; 2301 hdr[1] = 0; 2302 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2303 gtk, gtk_len); 2304 } 2305 pos = ieee80211w_kde_add(sm, pos); 2306 2307 #ifdef CONFIG_IEEE80211R 2308 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 2309 int res; 2310 struct wpa_auth_config *conf; 2311 2312 conf = &sm->wpa_auth->conf; 2313 res = wpa_write_ftie(conf, conf->r0_key_holder, 2314 conf->r0_key_holder_len, 2315 NULL, NULL, pos, kde + kde_len - pos, 2316 NULL, 0); 2317 if (res < 0) { 2318 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " 2319 "into EAPOL-Key Key Data"); 2320 os_free(kde); 2321 return; 2322 } 2323 pos += res; 2324 2325 /* TIE[ReassociationDeadline] (TU) */ 2326 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2327 *pos++ = 5; 2328 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; 2329 WPA_PUT_LE32(pos, conf->reassociation_deadline); 2330 pos += 4; 2331 2332 /* TIE[KeyLifetime] (seconds) */ 2333 *pos++ = WLAN_EID_TIMEOUT_INTERVAL; 2334 *pos++ = 5; 2335 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; 2336 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); 2337 pos += 4; 2338 } 2339 #endif /* CONFIG_IEEE80211R */ 2340 #ifdef CONFIG_P2P 2341 if (WPA_GET_BE32(sm->ip_addr) > 0) { 2342 u8 addr[3 * 4]; 2343 os_memcpy(addr, sm->ip_addr, 4); 2344 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4); 2345 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4); 2346 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC, 2347 addr, sizeof(addr), NULL, 0); 2348 } 2349 #endif /* CONFIG_P2P */ 2350 2351 wpa_send_eapol(sm->wpa_auth, sm, 2352 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | 2353 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | 2354 WPA_KEY_INFO_KEY_TYPE, 2355 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); 2356 os_free(kde); 2357 } 2358 2359 2360 SM_STATE(WPA_PTK, PTKINITDONE) 2361 { 2362 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); 2363 sm->EAPOLKeyReceived = FALSE; 2364 if (sm->Pair) { 2365 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); 2366 int klen = wpa_cipher_key_len(sm->pairwise); 2367 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 2368 sm->PTK.tk, klen)) { 2369 wpa_sta_disconnect(sm->wpa_auth, sm->addr); 2370 return; 2371 } 2372 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 2373 sm->pairwise_set = TRUE; 2374 2375 if (sm->wpa_auth->conf.wpa_ptk_rekey) { 2376 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); 2377 eloop_register_timeout(sm->wpa_auth->conf. 2378 wpa_ptk_rekey, 0, wpa_rekey_ptk, 2379 sm->wpa_auth, sm); 2380 } 2381 2382 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { 2383 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2384 WPA_EAPOL_authorized, 1); 2385 } 2386 } 2387 2388 if (0 /* IBSS == TRUE */) { 2389 sm->keycount++; 2390 if (sm->keycount == 2) { 2391 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, 2392 WPA_EAPOL_portValid, 1); 2393 } 2394 } else { 2395 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 2396 1); 2397 } 2398 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); 2399 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); 2400 if (sm->wpa == WPA_VERSION_WPA) 2401 sm->PInitAKeys = TRUE; 2402 else 2403 sm->has_GTK = TRUE; 2404 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2405 "pairwise key handshake completed (%s)", 2406 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2407 2408 #ifdef CONFIG_IEEE80211R 2409 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); 2410 #endif /* CONFIG_IEEE80211R */ 2411 } 2412 2413 2414 SM_STEP(WPA_PTK) 2415 { 2416 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 2417 2418 if (sm->Init) 2419 SM_ENTER(WPA_PTK, INITIALIZE); 2420 else if (sm->Disconnect 2421 /* || FIX: dot11RSNAConfigSALifetime timeout */) { 2422 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, 2423 "WPA_PTK: sm->Disconnect"); 2424 SM_ENTER(WPA_PTK, DISCONNECT); 2425 } 2426 else if (sm->DeauthenticationRequest) 2427 SM_ENTER(WPA_PTK, DISCONNECTED); 2428 else if (sm->AuthenticationRequest) 2429 SM_ENTER(WPA_PTK, AUTHENTICATION); 2430 else if (sm->ReAuthenticationRequest) 2431 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2432 else if (sm->PTKRequest) { 2433 if (wpa_auth_sm_ptk_update(sm) < 0) 2434 SM_ENTER(WPA_PTK, DISCONNECTED); 2435 else 2436 SM_ENTER(WPA_PTK, PTKSTART); 2437 } else switch (sm->wpa_ptk_state) { 2438 case WPA_PTK_INITIALIZE: 2439 break; 2440 case WPA_PTK_DISCONNECT: 2441 SM_ENTER(WPA_PTK, DISCONNECTED); 2442 break; 2443 case WPA_PTK_DISCONNECTED: 2444 SM_ENTER(WPA_PTK, INITIALIZE); 2445 break; 2446 case WPA_PTK_AUTHENTICATION: 2447 SM_ENTER(WPA_PTK, AUTHENTICATION2); 2448 break; 2449 case WPA_PTK_AUTHENTICATION2: 2450 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && 2451 wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2452 WPA_EAPOL_keyRun) > 0) 2453 SM_ENTER(WPA_PTK, INITPMK); 2454 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) 2455 /* FIX: && 802.1X::keyRun */) 2456 SM_ENTER(WPA_PTK, INITPSK); 2457 break; 2458 case WPA_PTK_INITPMK: 2459 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, 2460 WPA_EAPOL_keyAvailable) > 0) 2461 SM_ENTER(WPA_PTK, PTKSTART); 2462 else { 2463 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2464 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2465 "INITPMK - keyAvailable = false"); 2466 SM_ENTER(WPA_PTK, DISCONNECT); 2467 } 2468 break; 2469 case WPA_PTK_INITPSK: 2470 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, 2471 NULL)) 2472 SM_ENTER(WPA_PTK, PTKSTART); 2473 else { 2474 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2475 "no PSK configured for the STA"); 2476 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2477 SM_ENTER(WPA_PTK, DISCONNECT); 2478 } 2479 break; 2480 case WPA_PTK_PTKSTART: 2481 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2482 sm->EAPOLKeyPairwise) 2483 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2484 else if (sm->TimeoutCtr > 2485 (int) dot11RSNAConfigPairwiseUpdateCount) { 2486 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2487 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2488 "PTKSTART: Retry limit %d reached", 2489 dot11RSNAConfigPairwiseUpdateCount); 2490 SM_ENTER(WPA_PTK, DISCONNECT); 2491 } else if (sm->TimeoutEvt) 2492 SM_ENTER(WPA_PTK, PTKSTART); 2493 break; 2494 case WPA_PTK_PTKCALCNEGOTIATING: 2495 if (sm->MICVerified) 2496 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); 2497 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2498 sm->EAPOLKeyPairwise) 2499 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2500 else if (sm->TimeoutEvt) 2501 SM_ENTER(WPA_PTK, PTKSTART); 2502 break; 2503 case WPA_PTK_PTKCALCNEGOTIATING2: 2504 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2505 break; 2506 case WPA_PTK_PTKINITNEGOTIATING: 2507 if (sm->update_snonce) 2508 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); 2509 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2510 sm->EAPOLKeyPairwise && sm->MICVerified) 2511 SM_ENTER(WPA_PTK, PTKINITDONE); 2512 else if (sm->TimeoutCtr > 2513 (int) dot11RSNAConfigPairwiseUpdateCount) { 2514 wpa_auth->dot11RSNA4WayHandshakeFailures++; 2515 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2516 "PTKINITNEGOTIATING: Retry limit %d " 2517 "reached", 2518 dot11RSNAConfigPairwiseUpdateCount); 2519 SM_ENTER(WPA_PTK, DISCONNECT); 2520 } else if (sm->TimeoutEvt) 2521 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); 2522 break; 2523 case WPA_PTK_PTKINITDONE: 2524 break; 2525 } 2526 } 2527 2528 2529 SM_STATE(WPA_PTK_GROUP, IDLE) 2530 { 2531 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); 2532 if (sm->Init) { 2533 /* Init flag is not cleared here, so avoid busy 2534 * loop by claiming nothing changed. */ 2535 sm->changed = FALSE; 2536 } 2537 sm->GTimeoutCtr = 0; 2538 } 2539 2540 2541 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) 2542 { 2543 u8 rsc[WPA_KEY_RSC_LEN]; 2544 struct wpa_group *gsm = sm->group; 2545 const u8 *kde; 2546 u8 *kde_buf = NULL, *pos, hdr[2]; 2547 size_t kde_len; 2548 u8 *gtk, dummy_gtk[32]; 2549 2550 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); 2551 2552 sm->GTimeoutCtr++; 2553 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { 2554 /* No point in sending the EAPOL-Key - we will disconnect 2555 * immediately following this. */ 2556 return; 2557 } 2558 2559 if (sm->wpa == WPA_VERSION_WPA) 2560 sm->PInitAKeys = FALSE; 2561 sm->TimeoutEvt = FALSE; 2562 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ 2563 os_memset(rsc, 0, WPA_KEY_RSC_LEN); 2564 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) 2565 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); 2566 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2567 "sending 1/2 msg of Group Key Handshake"); 2568 2569 gtk = gsm->GTK[gsm->GN - 1]; 2570 if (sm->wpa_auth->conf.disable_gtk) { 2571 /* 2572 * Provide unique random GTK to each STA to prevent use 2573 * of GTK in the BSS. 2574 */ 2575 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) 2576 return; 2577 gtk = dummy_gtk; 2578 } 2579 if (sm->wpa == WPA_VERSION_WPA2) { 2580 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + 2581 ieee80211w_kde_len(sm); 2582 kde_buf = os_malloc(kde_len); 2583 if (kde_buf == NULL) 2584 return; 2585 2586 kde = pos = kde_buf; 2587 hdr[0] = gsm->GN & 0x03; 2588 hdr[1] = 0; 2589 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, 2590 gtk, gsm->GTK_len); 2591 pos = ieee80211w_kde_add(sm, pos); 2592 kde_len = pos - kde; 2593 } else { 2594 kde = gtk; 2595 kde_len = gsm->GTK_len; 2596 } 2597 2598 wpa_send_eapol(sm->wpa_auth, sm, 2599 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | 2600 WPA_KEY_INFO_ACK | 2601 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), 2602 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1); 2603 2604 os_free(kde_buf); 2605 } 2606 2607 2608 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) 2609 { 2610 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); 2611 sm->EAPOLKeyReceived = FALSE; 2612 if (sm->GUpdateStationKeys) 2613 sm->group->GKeyDoneStations--; 2614 sm->GUpdateStationKeys = FALSE; 2615 sm->GTimeoutCtr = 0; 2616 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ 2617 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, 2618 "group key handshake completed (%s)", 2619 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); 2620 sm->has_GTK = TRUE; 2621 } 2622 2623 2624 SM_STATE(WPA_PTK_GROUP, KEYERROR) 2625 { 2626 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); 2627 if (sm->GUpdateStationKeys) 2628 sm->group->GKeyDoneStations--; 2629 sm->GUpdateStationKeys = FALSE; 2630 sm->Disconnect = TRUE; 2631 } 2632 2633 2634 SM_STEP(WPA_PTK_GROUP) 2635 { 2636 if (sm->Init || sm->PtkGroupInit) { 2637 SM_ENTER(WPA_PTK_GROUP, IDLE); 2638 sm->PtkGroupInit = FALSE; 2639 } else switch (sm->wpa_ptk_group_state) { 2640 case WPA_PTK_GROUP_IDLE: 2641 if (sm->GUpdateStationKeys || 2642 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) 2643 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2644 break; 2645 case WPA_PTK_GROUP_REKEYNEGOTIATING: 2646 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && 2647 !sm->EAPOLKeyPairwise && sm->MICVerified) 2648 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); 2649 else if (sm->GTimeoutCtr > 2650 (int) dot11RSNAConfigGroupUpdateCount) 2651 SM_ENTER(WPA_PTK_GROUP, KEYERROR); 2652 else if (sm->TimeoutEvt) 2653 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); 2654 break; 2655 case WPA_PTK_GROUP_KEYERROR: 2656 SM_ENTER(WPA_PTK_GROUP, IDLE); 2657 break; 2658 case WPA_PTK_GROUP_REKEYESTABLISHED: 2659 SM_ENTER(WPA_PTK_GROUP, IDLE); 2660 break; 2661 } 2662 } 2663 2664 2665 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, 2666 struct wpa_group *group) 2667 { 2668 int ret = 0; 2669 2670 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2671 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2672 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", 2673 wpa_auth->addr, group->GNonce, 2674 group->GTK[group->GN - 1], group->GTK_len) < 0) 2675 ret = -1; 2676 wpa_hexdump_key(MSG_DEBUG, "GTK", 2677 group->GTK[group->GN - 1], group->GTK_len); 2678 2679 #ifdef CONFIG_IEEE80211W 2680 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2681 size_t len; 2682 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2683 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); 2684 inc_byte_array(group->Counter, WPA_NONCE_LEN); 2685 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", 2686 wpa_auth->addr, group->GNonce, 2687 group->IGTK[group->GN_igtk - 4], len) < 0) 2688 ret = -1; 2689 wpa_hexdump_key(MSG_DEBUG, "IGTK", 2690 group->IGTK[group->GN_igtk - 4], len); 2691 } 2692 #endif /* CONFIG_IEEE80211W */ 2693 2694 return ret; 2695 } 2696 2697 2698 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, 2699 struct wpa_group *group) 2700 { 2701 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2702 "GTK_INIT (VLAN-ID %d)", group->vlan_id); 2703 group->changed = FALSE; /* GInit is not cleared here; avoid loop */ 2704 group->wpa_group_state = WPA_GROUP_GTK_INIT; 2705 2706 /* GTK[0..N] = 0 */ 2707 os_memset(group->GTK, 0, sizeof(group->GTK)); 2708 group->GN = 1; 2709 group->GM = 2; 2710 #ifdef CONFIG_IEEE80211W 2711 group->GN_igtk = 4; 2712 group->GM_igtk = 5; 2713 #endif /* CONFIG_IEEE80211W */ 2714 /* GTK[GN] = CalcGTK() */ 2715 wpa_gtk_update(wpa_auth, group); 2716 } 2717 2718 2719 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) 2720 { 2721 if (ctx != NULL && ctx != sm->group) 2722 return 0; 2723 2724 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { 2725 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2726 "Not in PTKINITDONE; skip Group Key update"); 2727 sm->GUpdateStationKeys = FALSE; 2728 return 0; 2729 } 2730 if (sm->GUpdateStationKeys) { 2731 /* 2732 * This should not really happen, so add a debug log entry. 2733 * Since we clear the GKeyDoneStations before the loop, the 2734 * station needs to be counted here anyway. 2735 */ 2736 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, 2737 "GUpdateStationKeys was already set when " 2738 "marking station for GTK rekeying"); 2739 } 2740 2741 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ 2742 if (sm->is_wnmsleep) 2743 return 0; 2744 2745 sm->group->GKeyDoneStations++; 2746 sm->GUpdateStationKeys = TRUE; 2747 2748 wpa_sm_step(sm); 2749 return 0; 2750 } 2751 2752 2753 #ifdef CONFIG_WNM 2754 /* update GTK when exiting WNM-Sleep Mode */ 2755 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) 2756 { 2757 if (sm == NULL || sm->is_wnmsleep) 2758 return; 2759 2760 wpa_group_update_sta(sm, NULL); 2761 } 2762 2763 2764 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) 2765 { 2766 if (sm) 2767 sm->is_wnmsleep = !!flag; 2768 } 2769 2770 2771 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2772 { 2773 struct wpa_group *gsm = sm->group; 2774 u8 *start = pos; 2775 2776 /* 2777 * GTK subelement: 2778 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 2779 * Key[5..32] 2780 */ 2781 *pos++ = WNM_SLEEP_SUBELEM_GTK; 2782 *pos++ = 11 + gsm->GTK_len; 2783 /* Key ID in B0-B1 of Key Info */ 2784 WPA_PUT_LE16(pos, gsm->GN & 0x03); 2785 pos += 2; 2786 *pos++ = gsm->GTK_len; 2787 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) 2788 return 0; 2789 pos += 8; 2790 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2791 pos += gsm->GTK_len; 2792 2793 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", 2794 gsm->GN); 2795 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", 2796 gsm->GTK[gsm->GN - 1], gsm->GTK_len); 2797 2798 return pos - start; 2799 } 2800 2801 2802 #ifdef CONFIG_IEEE80211W 2803 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) 2804 { 2805 struct wpa_group *gsm = sm->group; 2806 u8 *start = pos; 2807 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); 2808 2809 /* 2810 * IGTK subelement: 2811 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] 2812 */ 2813 *pos++ = WNM_SLEEP_SUBELEM_IGTK; 2814 *pos++ = 2 + 6 + len; 2815 WPA_PUT_LE16(pos, gsm->GN_igtk); 2816 pos += 2; 2817 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) 2818 return 0; 2819 pos += 6; 2820 2821 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len); 2822 pos += len; 2823 2824 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", 2825 gsm->GN_igtk); 2826 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", 2827 gsm->IGTK[gsm->GN_igtk - 4], len); 2828 2829 return pos - start; 2830 } 2831 #endif /* CONFIG_IEEE80211W */ 2832 #endif /* CONFIG_WNM */ 2833 2834 2835 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, 2836 struct wpa_group *group) 2837 { 2838 int tmp; 2839 2840 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2841 "SETKEYS (VLAN-ID %d)", group->vlan_id); 2842 group->changed = TRUE; 2843 group->wpa_group_state = WPA_GROUP_SETKEYS; 2844 group->GTKReKey = FALSE; 2845 tmp = group->GM; 2846 group->GM = group->GN; 2847 group->GN = tmp; 2848 #ifdef CONFIG_IEEE80211W 2849 tmp = group->GM_igtk; 2850 group->GM_igtk = group->GN_igtk; 2851 group->GN_igtk = tmp; 2852 #endif /* CONFIG_IEEE80211W */ 2853 /* "GKeyDoneStations = GNoStations" is done in more robust way by 2854 * counting the STAs that are marked with GUpdateStationKeys instead of 2855 * including all STAs that could be in not-yet-completed state. */ 2856 wpa_gtk_update(wpa_auth, group); 2857 2858 if (group->GKeyDoneStations) { 2859 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " 2860 "GKeyDoneStations=%d when starting new GTK rekey", 2861 group->GKeyDoneStations); 2862 group->GKeyDoneStations = 0; 2863 } 2864 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); 2865 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", 2866 group->GKeyDoneStations); 2867 } 2868 2869 2870 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, 2871 struct wpa_group *group) 2872 { 2873 int ret = 0; 2874 2875 if (wpa_auth_set_key(wpa_auth, group->vlan_id, 2876 wpa_cipher_to_alg(wpa_auth->conf.wpa_group), 2877 broadcast_ether_addr, group->GN, 2878 group->GTK[group->GN - 1], group->GTK_len) < 0) 2879 ret = -1; 2880 2881 #ifdef CONFIG_IEEE80211W 2882 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { 2883 enum wpa_alg alg; 2884 size_t len; 2885 2886 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher); 2887 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher); 2888 2889 if (ret == 0 && 2890 wpa_auth_set_key(wpa_auth, group->vlan_id, alg, 2891 broadcast_ether_addr, group->GN_igtk, 2892 group->IGTK[group->GN_igtk - 4], len) < 0) 2893 ret = -1; 2894 } 2895 #endif /* CONFIG_IEEE80211W */ 2896 2897 return ret; 2898 } 2899 2900 2901 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx) 2902 { 2903 if (sm->group == ctx) { 2904 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR 2905 " for discconnection due to fatal failure", 2906 MAC2STR(sm->addr)); 2907 sm->Disconnect = TRUE; 2908 } 2909 2910 return 0; 2911 } 2912 2913 2914 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth, 2915 struct wpa_group *group) 2916 { 2917 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE"); 2918 group->changed = TRUE; 2919 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE; 2920 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group); 2921 } 2922 2923 2924 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, 2925 struct wpa_group *group) 2926 { 2927 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " 2928 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); 2929 group->changed = TRUE; 2930 group->wpa_group_state = WPA_GROUP_SETKEYSDONE; 2931 2932 if (wpa_group_config_group_keys(wpa_auth, group) < 0) { 2933 wpa_group_fatal_failure(wpa_auth, group); 2934 return -1; 2935 } 2936 2937 return 0; 2938 } 2939 2940 2941 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, 2942 struct wpa_group *group) 2943 { 2944 if (group->GInit) { 2945 wpa_group_gtk_init(wpa_auth, group); 2946 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) { 2947 /* Do not allow group operations */ 2948 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && 2949 group->GTKAuthenticator) { 2950 wpa_group_setkeysdone(wpa_auth, group); 2951 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && 2952 group->GTKReKey) { 2953 wpa_group_setkeys(wpa_auth, group); 2954 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { 2955 if (group->GKeyDoneStations == 0) 2956 wpa_group_setkeysdone(wpa_auth, group); 2957 else if (group->GTKReKey) 2958 wpa_group_setkeys(wpa_auth, group); 2959 } 2960 } 2961 2962 2963 static int wpa_sm_step(struct wpa_state_machine *sm) 2964 { 2965 if (sm == NULL) 2966 return 0; 2967 2968 if (sm->in_step_loop) { 2969 /* This should not happen, but if it does, make sure we do not 2970 * end up freeing the state machine too early by exiting the 2971 * recursive call. */ 2972 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); 2973 return 0; 2974 } 2975 2976 sm->in_step_loop = 1; 2977 do { 2978 if (sm->pending_deinit) 2979 break; 2980 2981 sm->changed = FALSE; 2982 sm->wpa_auth->group->changed = FALSE; 2983 2984 SM_STEP_RUN(WPA_PTK); 2985 if (sm->pending_deinit) 2986 break; 2987 SM_STEP_RUN(WPA_PTK_GROUP); 2988 if (sm->pending_deinit) 2989 break; 2990 wpa_group_sm_step(sm->wpa_auth, sm->group); 2991 } while (sm->changed || sm->wpa_auth->group->changed); 2992 sm->in_step_loop = 0; 2993 2994 if (sm->pending_deinit) { 2995 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " 2996 "machine deinit for " MACSTR, MAC2STR(sm->addr)); 2997 wpa_free_sta_sm(sm); 2998 return 1; 2999 } 3000 return 0; 3001 } 3002 3003 3004 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) 3005 { 3006 struct wpa_state_machine *sm = eloop_ctx; 3007 wpa_sm_step(sm); 3008 } 3009 3010 3011 void wpa_auth_sm_notify(struct wpa_state_machine *sm) 3012 { 3013 if (sm == NULL) 3014 return; 3015 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); 3016 } 3017 3018 3019 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) 3020 { 3021 int tmp, i; 3022 struct wpa_group *group; 3023 3024 if (wpa_auth == NULL) 3025 return; 3026 3027 group = wpa_auth->group; 3028 3029 for (i = 0; i < 2; i++) { 3030 tmp = group->GM; 3031 group->GM = group->GN; 3032 group->GN = tmp; 3033 #ifdef CONFIG_IEEE80211W 3034 tmp = group->GM_igtk; 3035 group->GM_igtk = group->GN_igtk; 3036 group->GN_igtk = tmp; 3037 #endif /* CONFIG_IEEE80211W */ 3038 wpa_gtk_update(wpa_auth, group); 3039 wpa_group_config_group_keys(wpa_auth, group); 3040 } 3041 } 3042 3043 3044 static const char * wpa_bool_txt(int val) 3045 { 3046 return val ? "TRUE" : "FALSE"; 3047 } 3048 3049 3050 #define RSN_SUITE "%02x-%02x-%02x-%d" 3051 #define RSN_SUITE_ARG(s) \ 3052 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 3053 3054 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) 3055 { 3056 int len = 0, ret; 3057 char pmkid_txt[PMKID_LEN * 2 + 1]; 3058 #ifdef CONFIG_RSN_PREAUTH 3059 const int preauth = 1; 3060 #else /* CONFIG_RSN_PREAUTH */ 3061 const int preauth = 0; 3062 #endif /* CONFIG_RSN_PREAUTH */ 3063 3064 if (wpa_auth == NULL) 3065 return len; 3066 3067 ret = os_snprintf(buf + len, buflen - len, 3068 "dot11RSNAOptionImplemented=TRUE\n" 3069 "dot11RSNAPreauthenticationImplemented=%s\n" 3070 "dot11RSNAEnabled=%s\n" 3071 "dot11RSNAPreauthenticationEnabled=%s\n", 3072 wpa_bool_txt(preauth), 3073 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), 3074 wpa_bool_txt(wpa_auth->conf.rsn_preauth)); 3075 if (os_snprintf_error(buflen - len, ret)) 3076 return len; 3077 len += ret; 3078 3079 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 3080 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); 3081 3082 ret = os_snprintf( 3083 buf + len, buflen - len, 3084 "dot11RSNAConfigVersion=%u\n" 3085 "dot11RSNAConfigPairwiseKeysSupported=9999\n" 3086 /* FIX: dot11RSNAConfigGroupCipher */ 3087 /* FIX: dot11RSNAConfigGroupRekeyMethod */ 3088 /* FIX: dot11RSNAConfigGroupRekeyTime */ 3089 /* FIX: dot11RSNAConfigGroupRekeyPackets */ 3090 "dot11RSNAConfigGroupRekeyStrict=%u\n" 3091 "dot11RSNAConfigGroupUpdateCount=%u\n" 3092 "dot11RSNAConfigPairwiseUpdateCount=%u\n" 3093 "dot11RSNAConfigGroupCipherSize=%u\n" 3094 "dot11RSNAConfigPMKLifetime=%u\n" 3095 "dot11RSNAConfigPMKReauthThreshold=%u\n" 3096 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" 3097 "dot11RSNAConfigSATimeout=%u\n" 3098 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 3099 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 3100 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 3101 "dot11RSNAPMKIDUsed=%s\n" 3102 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 3103 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 3104 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 3105 "dot11RSNATKIPCounterMeasuresInvoked=%u\n" 3106 "dot11RSNA4WayHandshakeFailures=%u\n" 3107 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", 3108 RSN_VERSION, 3109 !!wpa_auth->conf.wpa_strict_rekey, 3110 dot11RSNAConfigGroupUpdateCount, 3111 dot11RSNAConfigPairwiseUpdateCount, 3112 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, 3113 dot11RSNAConfigPMKLifetime, 3114 dot11RSNAConfigPMKReauthThreshold, 3115 dot11RSNAConfigSATimeout, 3116 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), 3117 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), 3118 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), 3119 pmkid_txt, 3120 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), 3121 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), 3122 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), 3123 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, 3124 wpa_auth->dot11RSNA4WayHandshakeFailures); 3125 if (os_snprintf_error(buflen - len, ret)) 3126 return len; 3127 len += ret; 3128 3129 /* TODO: dot11RSNAConfigPairwiseCiphersTable */ 3130 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ 3131 3132 /* Private MIB */ 3133 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", 3134 wpa_auth->group->wpa_group_state); 3135 if (os_snprintf_error(buflen - len, ret)) 3136 return len; 3137 len += ret; 3138 3139 return len; 3140 } 3141 3142 3143 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) 3144 { 3145 int len = 0, ret; 3146 u32 pairwise = 0; 3147 3148 if (sm == NULL) 3149 return 0; 3150 3151 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ 3152 3153 /* dot11RSNAStatsEntry */ 3154 3155 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? 3156 WPA_PROTO_RSN : WPA_PROTO_WPA, 3157 sm->pairwise); 3158 if (pairwise == 0) 3159 return 0; 3160 3161 ret = os_snprintf( 3162 buf + len, buflen - len, 3163 /* TODO: dot11RSNAStatsIndex */ 3164 "dot11RSNAStatsSTAAddress=" MACSTR "\n" 3165 "dot11RSNAStatsVersion=1\n" 3166 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" 3167 /* TODO: dot11RSNAStatsTKIPICVErrors */ 3168 "dot11RSNAStatsTKIPLocalMICFailures=%u\n" 3169 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" 3170 /* TODO: dot11RSNAStatsCCMPReplays */ 3171 /* TODO: dot11RSNAStatsCCMPDecryptErrors */ 3172 /* TODO: dot11RSNAStatsTKIPReplays */, 3173 MAC2STR(sm->addr), 3174 RSN_SUITE_ARG(pairwise), 3175 sm->dot11RSNAStatsTKIPLocalMICFailures, 3176 sm->dot11RSNAStatsTKIPRemoteMICFailures); 3177 if (os_snprintf_error(buflen - len, ret)) 3178 return len; 3179 len += ret; 3180 3181 /* Private MIB */ 3182 ret = os_snprintf(buf + len, buflen - len, 3183 "hostapdWPAPTKState=%d\n" 3184 "hostapdWPAPTKGroupState=%d\n", 3185 sm->wpa_ptk_state, 3186 sm->wpa_ptk_group_state); 3187 if (os_snprintf_error(buflen - len, ret)) 3188 return len; 3189 len += ret; 3190 3191 return len; 3192 } 3193 3194 3195 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) 3196 { 3197 if (wpa_auth) 3198 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; 3199 } 3200 3201 3202 int wpa_auth_pairwise_set(struct wpa_state_machine *sm) 3203 { 3204 return sm && sm->pairwise_set; 3205 } 3206 3207 3208 int wpa_auth_get_pairwise(struct wpa_state_machine *sm) 3209 { 3210 return sm->pairwise; 3211 } 3212 3213 3214 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) 3215 { 3216 if (sm == NULL) 3217 return -1; 3218 return sm->wpa_key_mgmt; 3219 } 3220 3221 3222 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) 3223 { 3224 if (sm == NULL) 3225 return 0; 3226 return sm->wpa; 3227 } 3228 3229 3230 int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm) 3231 { 3232 if (!sm || !wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 3233 return 0; 3234 return sm->tk_already_set; 3235 } 3236 3237 3238 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, 3239 struct rsn_pmksa_cache_entry *entry) 3240 { 3241 if (sm == NULL || sm->pmksa != entry) 3242 return -1; 3243 sm->pmksa = NULL; 3244 return 0; 3245 } 3246 3247 3248 struct rsn_pmksa_cache_entry * 3249 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) 3250 { 3251 return sm ? sm->pmksa : NULL; 3252 } 3253 3254 3255 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) 3256 { 3257 if (sm) 3258 sm->dot11RSNAStatsTKIPLocalMICFailures++; 3259 } 3260 3261 3262 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) 3263 { 3264 if (wpa_auth == NULL) 3265 return NULL; 3266 *len = wpa_auth->wpa_ie_len; 3267 return wpa_auth->wpa_ie; 3268 } 3269 3270 3271 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, 3272 int session_timeout, struct eapol_state_machine *eapol) 3273 { 3274 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || 3275 sm->wpa_auth->conf.disable_pmksa_caching) 3276 return -1; 3277 3278 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, 3279 sm->PTK.kck, sm->PTK.kck_len, 3280 sm->wpa_auth->addr, sm->addr, session_timeout, 3281 eapol, sm->wpa_key_mgmt)) 3282 return 0; 3283 3284 return -1; 3285 } 3286 3287 3288 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, 3289 const u8 *pmk, size_t len, const u8 *sta_addr, 3290 int session_timeout, 3291 struct eapol_state_machine *eapol) 3292 { 3293 if (wpa_auth == NULL) 3294 return -1; 3295 3296 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, 3297 NULL, 0, 3298 wpa_auth->addr, 3299 sta_addr, session_timeout, eapol, 3300 WPA_KEY_MGMT_IEEE8021X)) 3301 return 0; 3302 3303 return -1; 3304 } 3305 3306 3307 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr, 3308 const u8 *pmk) 3309 { 3310 if (wpa_auth->conf.disable_pmksa_caching) 3311 return -1; 3312 3313 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, 3314 NULL, 0, 3315 wpa_auth->addr, addr, 0, NULL, 3316 WPA_KEY_MGMT_SAE)) 3317 return 0; 3318 3319 return -1; 3320 } 3321 3322 3323 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth, 3324 const u8 *sta_addr) 3325 { 3326 struct rsn_pmksa_cache_entry *pmksa; 3327 3328 if (wpa_auth == NULL || wpa_auth->pmksa == NULL) 3329 return; 3330 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL); 3331 if (pmksa) { 3332 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for " 3333 MACSTR " based on request", MAC2STR(sta_addr)); 3334 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa); 3335 } 3336 } 3337 3338 3339 /* 3340 * Remove and free the group from wpa_authenticator. This is triggered by a 3341 * callback to make sure nobody is currently iterating the group list while it 3342 * gets modified. 3343 */ 3344 static void wpa_group_free(struct wpa_authenticator *wpa_auth, 3345 struct wpa_group *group) 3346 { 3347 struct wpa_group *prev = wpa_auth->group; 3348 3349 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d", 3350 group->vlan_id); 3351 3352 while (prev) { 3353 if (prev->next == group) { 3354 /* This never frees the special first group as needed */ 3355 prev->next = group->next; 3356 os_free(group); 3357 break; 3358 } 3359 prev = prev->next; 3360 } 3361 3362 } 3363 3364 3365 /* Increase the reference counter for group */ 3366 static void wpa_group_get(struct wpa_authenticator *wpa_auth, 3367 struct wpa_group *group) 3368 { 3369 /* Skip the special first group */ 3370 if (wpa_auth->group == group) 3371 return; 3372 3373 group->references++; 3374 } 3375 3376 3377 /* Decrease the reference counter and maybe free the group */ 3378 static void wpa_group_put(struct wpa_authenticator *wpa_auth, 3379 struct wpa_group *group) 3380 { 3381 /* Skip the special first group */ 3382 if (wpa_auth->group == group) 3383 return; 3384 3385 group->references--; 3386 if (group->references) 3387 return; 3388 wpa_group_free(wpa_auth, group); 3389 } 3390 3391 3392 /* 3393 * Add a group that has its references counter set to zero. Caller needs to 3394 * call wpa_group_get() on the return value to mark the entry in use. 3395 */ 3396 static struct wpa_group * 3397 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) 3398 { 3399 struct wpa_group *group; 3400 3401 if (wpa_auth == NULL || wpa_auth->group == NULL) 3402 return NULL; 3403 3404 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", 3405 vlan_id); 3406 group = wpa_group_init(wpa_auth, vlan_id, 0); 3407 if (group == NULL) 3408 return NULL; 3409 3410 group->next = wpa_auth->group->next; 3411 wpa_auth->group->next = group; 3412 3413 return group; 3414 } 3415 3416 3417 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) 3418 { 3419 struct wpa_group *group; 3420 3421 if (sm == NULL || sm->wpa_auth == NULL) 3422 return 0; 3423 3424 group = sm->wpa_auth->group; 3425 while (group) { 3426 if (group->vlan_id == vlan_id) 3427 break; 3428 group = group->next; 3429 } 3430 3431 if (group == NULL) { 3432 group = wpa_auth_add_group(sm->wpa_auth, vlan_id); 3433 if (group == NULL) 3434 return -1; 3435 } 3436 3437 if (sm->group == group) 3438 return 0; 3439 3440 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) 3441 return -1; 3442 3443 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " 3444 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); 3445 3446 wpa_group_get(sm->wpa_auth, group); 3447 wpa_group_put(sm->wpa_auth, sm->group); 3448 sm->group = group; 3449 3450 return 0; 3451 } 3452 3453 3454 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, 3455 struct wpa_state_machine *sm, int ack) 3456 { 3457 if (wpa_auth == NULL || sm == NULL) 3458 return; 3459 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR 3460 " ack=%d", MAC2STR(sm->addr), ack); 3461 if (sm->pending_1_of_4_timeout && ack) { 3462 /* 3463 * Some deployed supplicant implementations update their SNonce 3464 * for each EAPOL-Key 2/4 message even within the same 4-way 3465 * handshake and then fail to use the first SNonce when 3466 * deriving the PTK. This results in unsuccessful 4-way 3467 * handshake whenever the relatively short initial timeout is 3468 * reached and EAPOL-Key 1/4 is retransmitted. Try to work 3469 * around this by increasing the timeout now that we know that 3470 * the station has received the frame. 3471 */ 3472 int timeout_ms = eapol_key_timeout_subseq; 3473 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " 3474 "timeout by %u ms because of acknowledged frame", 3475 timeout_ms); 3476 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); 3477 eloop_register_timeout(timeout_ms / 1000, 3478 (timeout_ms % 1000) * 1000, 3479 wpa_send_eapol_timeout, wpa_auth, sm); 3480 } 3481 } 3482 3483 3484 int wpa_auth_uses_sae(struct wpa_state_machine *sm) 3485 { 3486 if (sm == NULL) 3487 return 0; 3488 return wpa_key_mgmt_sae(sm->wpa_key_mgmt); 3489 } 3490 3491 3492 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm) 3493 { 3494 if (sm == NULL) 3495 return 0; 3496 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE; 3497 } 3498 3499 3500 #ifdef CONFIG_P2P 3501 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr) 3502 { 3503 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0) 3504 return -1; 3505 os_memcpy(addr, sm->ip_addr, 4); 3506 return 0; 3507 } 3508 #endif /* CONFIG_P2P */ 3509 3510 3511 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth, 3512 struct radius_das_attrs *attr) 3513 { 3514 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr); 3515 } 3516 3517 3518 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth) 3519 { 3520 struct wpa_group *group; 3521 3522 if (!wpa_auth) 3523 return; 3524 for (group = wpa_auth->group; group; group = group->next) 3525 wpa_group_config_group_keys(wpa_auth, group); 3526 } 3527