xref: /freebsd/contrib/wpa/src/ap/wpa_auth.c (revision 3b8f08459569bf0faa21473e5cec2491e95c9349)
1 /*
2  * IEEE 802.11 RSN / WPA Authenticator
3  * Copyright (c) 2004-2011, 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 "common/ieee802_11_defs.h"
15 #include "crypto/aes_wrap.h"
16 #include "crypto/crypto.h"
17 #include "crypto/sha1.h"
18 #include "crypto/sha256.h"
19 #include "crypto/random.h"
20 #include "eapol_auth/eapol_auth_sm.h"
21 #include "ap_config.h"
22 #include "ieee802_11.h"
23 #include "wpa_auth.h"
24 #include "pmksa_cache_auth.h"
25 #include "wpa_auth_i.h"
26 #include "wpa_auth_ie.h"
27 
28 #define STATE_MACHINE_DATA struct wpa_state_machine
29 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
30 #define STATE_MACHINE_ADDR sm->addr
31 
32 
33 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
34 static int wpa_sm_step(struct wpa_state_machine *sm);
35 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
36 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
37 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
38 			      struct wpa_group *group);
39 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
40 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
41 			  struct wpa_group *group);
42 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
43 				       struct wpa_group *group);
44 
45 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
46 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
47 static const u32 eapol_key_timeout_first = 100; /* ms */
48 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
49 static const u32 eapol_key_timeout_first_group = 500; /* ms */
50 
51 /* TODO: make these configurable */
52 static const int dot11RSNAConfigPMKLifetime = 43200;
53 static const int dot11RSNAConfigPMKReauthThreshold = 70;
54 static const int dot11RSNAConfigSATimeout = 60;
55 
56 
57 static inline int wpa_auth_mic_failure_report(
58 	struct wpa_authenticator *wpa_auth, const u8 *addr)
59 {
60 	if (wpa_auth->cb.mic_failure_report)
61 		return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
62 	return 0;
63 }
64 
65 
66 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
67 				      const u8 *addr, wpa_eapol_variable var,
68 				      int value)
69 {
70 	if (wpa_auth->cb.set_eapol)
71 		wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
72 }
73 
74 
75 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
76 				     const u8 *addr, wpa_eapol_variable var)
77 {
78 	if (wpa_auth->cb.get_eapol == NULL)
79 		return -1;
80 	return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
81 }
82 
83 
84 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
85 					  const u8 *addr, const u8 *prev_psk)
86 {
87 	if (wpa_auth->cb.get_psk == NULL)
88 		return NULL;
89 	return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk);
90 }
91 
92 
93 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
94 				   const u8 *addr, u8 *msk, size_t *len)
95 {
96 	if (wpa_auth->cb.get_msk == NULL)
97 		return -1;
98 	return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
99 }
100 
101 
102 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
103 				   int vlan_id,
104 				   enum wpa_alg alg, const u8 *addr, int idx,
105 				   u8 *key, size_t key_len)
106 {
107 	if (wpa_auth->cb.set_key == NULL)
108 		return -1;
109 	return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
110 				    key, key_len);
111 }
112 
113 
114 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
115 				      const u8 *addr, int idx, u8 *seq)
116 {
117 	if (wpa_auth->cb.get_seqnum == NULL)
118 		return -1;
119 	return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
120 }
121 
122 
123 static inline int
124 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
125 		    const u8 *data, size_t data_len, int encrypt)
126 {
127 	if (wpa_auth->cb.send_eapol == NULL)
128 		return -1;
129 	return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
130 				       encrypt);
131 }
132 
133 
134 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
135 			  int (*cb)(struct wpa_state_machine *sm, void *ctx),
136 			  void *cb_ctx)
137 {
138 	if (wpa_auth->cb.for_each_sta == NULL)
139 		return 0;
140 	return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
141 }
142 
143 
144 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
145 			   int (*cb)(struct wpa_authenticator *a, void *ctx),
146 			   void *cb_ctx)
147 {
148 	if (wpa_auth->cb.for_each_auth == NULL)
149 		return 0;
150 	return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
151 }
152 
153 
154 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
155 		     logger_level level, const char *txt)
156 {
157 	if (wpa_auth->cb.logger == NULL)
158 		return;
159 	wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
160 }
161 
162 
163 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
164 		      logger_level level, const char *fmt, ...)
165 {
166 	char *format;
167 	int maxlen;
168 	va_list ap;
169 
170 	if (wpa_auth->cb.logger == NULL)
171 		return;
172 
173 	maxlen = os_strlen(fmt) + 100;
174 	format = os_malloc(maxlen);
175 	if (!format)
176 		return;
177 
178 	va_start(ap, fmt);
179 	vsnprintf(format, maxlen, fmt, ap);
180 	va_end(ap);
181 
182 	wpa_auth_logger(wpa_auth, addr, level, format);
183 
184 	os_free(format);
185 }
186 
187 
188 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
189 			       const u8 *addr)
190 {
191 	if (wpa_auth->cb.disconnect == NULL)
192 		return;
193 	wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
194 	wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
195 				WLAN_REASON_PREV_AUTH_NOT_VALID);
196 }
197 
198 
199 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
200 {
201 	int ret = 0;
202 #ifdef CONFIG_IEEE80211R
203 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
204 		ret = 1;
205 #endif /* CONFIG_IEEE80211R */
206 #ifdef CONFIG_IEEE80211W
207 	if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
208 		ret = 1;
209 #endif /* CONFIG_IEEE80211W */
210 	return ret;
211 }
212 
213 
214 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
215 {
216 	struct wpa_authenticator *wpa_auth = eloop_ctx;
217 
218 	if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
219 		wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
220 			   "initialization.");
221 	} else {
222 		wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
223 		wpa_hexdump_key(MSG_DEBUG, "GMK",
224 				wpa_auth->group->GMK, WPA_GMK_LEN);
225 	}
226 
227 	if (wpa_auth->conf.wpa_gmk_rekey) {
228 		eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
229 				       wpa_rekey_gmk, wpa_auth, NULL);
230 	}
231 }
232 
233 
234 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
235 {
236 	struct wpa_authenticator *wpa_auth = eloop_ctx;
237 	struct wpa_group *group;
238 
239 	wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
240 	for (group = wpa_auth->group; group; group = group->next) {
241 		group->GTKReKey = TRUE;
242 		do {
243 			group->changed = FALSE;
244 			wpa_group_sm_step(wpa_auth, group);
245 		} while (group->changed);
246 	}
247 
248 	if (wpa_auth->conf.wpa_group_rekey) {
249 		eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
250 				       0, wpa_rekey_gtk, wpa_auth, NULL);
251 	}
252 }
253 
254 
255 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
256 {
257 	struct wpa_authenticator *wpa_auth = eloop_ctx;
258 	struct wpa_state_machine *sm = timeout_ctx;
259 
260 	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
261 	wpa_request_new_ptk(sm);
262 	wpa_sm_step(sm);
263 }
264 
265 
266 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
267 {
268 	if (sm->pmksa == ctx)
269 		sm->pmksa = NULL;
270 	return 0;
271 }
272 
273 
274 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
275 				   void *ctx)
276 {
277 	struct wpa_authenticator *wpa_auth = ctx;
278 	wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
279 }
280 
281 
282 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
283 					  struct wpa_group *group)
284 {
285 	u8 buf[ETH_ALEN + 8 + sizeof(group)];
286 	u8 rkey[32];
287 
288 	if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
289 		return -1;
290 	wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
291 
292 	/*
293 	 * Counter = PRF-256(Random number, "Init Counter",
294 	 *                   Local MAC Address || Time)
295 	 */
296 	os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
297 	wpa_get_ntp_timestamp(buf + ETH_ALEN);
298 	os_memcpy(buf + ETH_ALEN + 8, &group, sizeof(group));
299 	if (random_get_bytes(rkey, sizeof(rkey)) < 0)
300 		return -1;
301 
302 	if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
303 		     group->Counter, WPA_NONCE_LEN) < 0)
304 		return -1;
305 	wpa_hexdump_key(MSG_DEBUG, "Key Counter",
306 			group->Counter, WPA_NONCE_LEN);
307 
308 	return 0;
309 }
310 
311 
312 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
313 					 int vlan_id, int delay_init)
314 {
315 	struct wpa_group *group;
316 
317 	group = os_zalloc(sizeof(struct wpa_group));
318 	if (group == NULL)
319 		return NULL;
320 
321 	group->GTKAuthenticator = TRUE;
322 	group->vlan_id = vlan_id;
323 	group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
324 
325 	if (random_pool_ready() != 1) {
326 		wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
327 			   "for secure operations - update keys later when "
328 			   "the first station connects");
329 	}
330 
331 	/*
332 	 * Set initial GMK/Counter value here. The actual values that will be
333 	 * used in negotiations will be set once the first station tries to
334 	 * connect. This allows more time for collecting additional randomness
335 	 * on embedded devices.
336 	 */
337 	if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
338 		wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
339 			   "initialization.");
340 		os_free(group);
341 		return NULL;
342 	}
343 
344 	group->GInit = TRUE;
345 	if (delay_init) {
346 		wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
347 			   "until Beacon frames have been configured");
348 		/* Initialization is completed in wpa_init_keys(). */
349 	} else {
350 		wpa_group_sm_step(wpa_auth, group);
351 		group->GInit = FALSE;
352 		wpa_group_sm_step(wpa_auth, group);
353 	}
354 
355 	return group;
356 }
357 
358 
359 /**
360  * wpa_init - Initialize WPA authenticator
361  * @addr: Authenticator address
362  * @conf: Configuration for WPA authenticator
363  * @cb: Callback functions for WPA authenticator
364  * Returns: Pointer to WPA authenticator data or %NULL on failure
365  */
366 struct wpa_authenticator * wpa_init(const u8 *addr,
367 				    struct wpa_auth_config *conf,
368 				    struct wpa_auth_callbacks *cb)
369 {
370 	struct wpa_authenticator *wpa_auth;
371 
372 	wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
373 	if (wpa_auth == NULL)
374 		return NULL;
375 	os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
376 	os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
377 	os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
378 
379 	if (wpa_auth_gen_wpa_ie(wpa_auth)) {
380 		wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
381 		os_free(wpa_auth);
382 		return NULL;
383 	}
384 
385 	wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
386 	if (wpa_auth->group == NULL) {
387 		os_free(wpa_auth->wpa_ie);
388 		os_free(wpa_auth);
389 		return NULL;
390 	}
391 
392 	wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
393 						wpa_auth);
394 	if (wpa_auth->pmksa == NULL) {
395 		wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
396 		os_free(wpa_auth->wpa_ie);
397 		os_free(wpa_auth);
398 		return NULL;
399 	}
400 
401 #ifdef CONFIG_IEEE80211R
402 	wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
403 	if (wpa_auth->ft_pmk_cache == NULL) {
404 		wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
405 		os_free(wpa_auth->wpa_ie);
406 		pmksa_cache_auth_deinit(wpa_auth->pmksa);
407 		os_free(wpa_auth);
408 		return NULL;
409 	}
410 #endif /* CONFIG_IEEE80211R */
411 
412 	if (wpa_auth->conf.wpa_gmk_rekey) {
413 		eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
414 				       wpa_rekey_gmk, wpa_auth, NULL);
415 	}
416 
417 	if (wpa_auth->conf.wpa_group_rekey) {
418 		eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
419 				       wpa_rekey_gtk, wpa_auth, NULL);
420 	}
421 
422 	return wpa_auth;
423 }
424 
425 
426 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
427 {
428 	struct wpa_group *group = wpa_auth->group;
429 
430 	wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
431 		   "keys");
432 	wpa_group_sm_step(wpa_auth, group);
433 	group->GInit = FALSE;
434 	wpa_group_sm_step(wpa_auth, group);
435 	return 0;
436 }
437 
438 
439 /**
440  * wpa_deinit - Deinitialize WPA authenticator
441  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
442  */
443 void wpa_deinit(struct wpa_authenticator *wpa_auth)
444 {
445 	struct wpa_group *group, *prev;
446 
447 	eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
448 	eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
449 
450 #ifdef CONFIG_PEERKEY
451 	while (wpa_auth->stsl_negotiations)
452 		wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
453 #endif /* CONFIG_PEERKEY */
454 
455 	pmksa_cache_auth_deinit(wpa_auth->pmksa);
456 
457 #ifdef CONFIG_IEEE80211R
458 	wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
459 	wpa_auth->ft_pmk_cache = NULL;
460 #endif /* CONFIG_IEEE80211R */
461 
462 	os_free(wpa_auth->wpa_ie);
463 
464 	group = wpa_auth->group;
465 	while (group) {
466 		prev = group;
467 		group = group->next;
468 		os_free(prev);
469 	}
470 
471 	os_free(wpa_auth);
472 }
473 
474 
475 /**
476  * wpa_reconfig - Update WPA authenticator configuration
477  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
478  * @conf: Configuration for WPA authenticator
479  */
480 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
481 		 struct wpa_auth_config *conf)
482 {
483 	struct wpa_group *group;
484 	if (wpa_auth == NULL)
485 		return 0;
486 
487 	os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
488 	if (wpa_auth_gen_wpa_ie(wpa_auth)) {
489 		wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
490 		return -1;
491 	}
492 
493 	/*
494 	 * Reinitialize GTK to make sure it is suitable for the new
495 	 * configuration.
496 	 */
497 	group = wpa_auth->group;
498 	group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
499 	group->GInit = TRUE;
500 	wpa_group_sm_step(wpa_auth, group);
501 	group->GInit = FALSE;
502 	wpa_group_sm_step(wpa_auth, group);
503 
504 	return 0;
505 }
506 
507 
508 struct wpa_state_machine *
509 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr)
510 {
511 	struct wpa_state_machine *sm;
512 
513 	sm = os_zalloc(sizeof(struct wpa_state_machine));
514 	if (sm == NULL)
515 		return NULL;
516 	os_memcpy(sm->addr, addr, ETH_ALEN);
517 
518 	sm->wpa_auth = wpa_auth;
519 	sm->group = wpa_auth->group;
520 
521 	return sm;
522 }
523 
524 
525 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
526 			    struct wpa_state_machine *sm)
527 {
528 	if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
529 		return -1;
530 
531 #ifdef CONFIG_IEEE80211R
532 	if (sm->ft_completed) {
533 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
534 				"FT authentication already completed - do not "
535 				"start 4-way handshake");
536 		return 0;
537 	}
538 #endif /* CONFIG_IEEE80211R */
539 
540 	if (sm->started) {
541 		os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
542 		sm->ReAuthenticationRequest = TRUE;
543 		return wpa_sm_step(sm);
544 	}
545 
546 	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
547 			"start authentication");
548 	sm->started = 1;
549 
550 	sm->Init = TRUE;
551 	if (wpa_sm_step(sm) == 1)
552 		return 1; /* should not really happen */
553 	sm->Init = FALSE;
554 	sm->AuthenticationRequest = TRUE;
555 	return wpa_sm_step(sm);
556 }
557 
558 
559 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
560 {
561 	/* WPA/RSN was not used - clear WPA state. This is needed if the STA
562 	 * reassociates back to the same AP while the previous entry for the
563 	 * STA has not yet been removed. */
564 	if (sm == NULL)
565 		return;
566 
567 	sm->wpa_key_mgmt = 0;
568 }
569 
570 
571 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
572 {
573 	if (sm->GUpdateStationKeys) {
574 		sm->group->GKeyDoneStations--;
575 		sm->GUpdateStationKeys = FALSE;
576 	}
577 #ifdef CONFIG_IEEE80211R
578 	os_free(sm->assoc_resp_ftie);
579 #endif /* CONFIG_IEEE80211R */
580 	os_free(sm->last_rx_eapol_key);
581 	os_free(sm->wpa_ie);
582 	os_free(sm);
583 }
584 
585 
586 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
587 {
588 	if (sm == NULL)
589 		return;
590 
591 	if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
592 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
593 				"strict rekeying - force GTK rekey since STA "
594 				"is leaving");
595 		eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
596 		eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
597 				       NULL);
598 	}
599 
600 	eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
601 	sm->pending_1_of_4_timeout = 0;
602 	eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
603 	eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
604 	if (sm->in_step_loop) {
605 		/* Must not free state machine while wpa_sm_step() is running.
606 		 * Freeing will be completed in the end of wpa_sm_step(). */
607 		wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
608 			   "machine deinit for " MACSTR, MAC2STR(sm->addr));
609 		sm->pending_deinit = 1;
610 	} else
611 		wpa_free_sta_sm(sm);
612 }
613 
614 
615 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
616 {
617 	if (sm == NULL)
618 		return;
619 
620 	sm->PTKRequest = TRUE;
621 	sm->PTK_valid = 0;
622 }
623 
624 
625 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
626 				    const u8 *replay_counter)
627 {
628 	int i;
629 	for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
630 		if (!ctr[i].valid)
631 			break;
632 		if (os_memcmp(replay_counter, ctr[i].counter,
633 			      WPA_REPLAY_COUNTER_LEN) == 0)
634 			return 1;
635 	}
636 	return 0;
637 }
638 
639 
640 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
641 					    const u8 *replay_counter)
642 {
643 	int i;
644 	for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
645 		if (ctr[i].valid &&
646 		    (replay_counter == NULL ||
647 		     os_memcmp(replay_counter, ctr[i].counter,
648 			       WPA_REPLAY_COUNTER_LEN) == 0))
649 			ctr[i].valid = FALSE;
650 	}
651 }
652 
653 
654 #ifdef CONFIG_IEEE80211R
655 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
656 			       struct wpa_state_machine *sm,
657 			       struct wpa_eapol_ie_parse *kde)
658 {
659 	struct wpa_ie_data ie;
660 	struct rsn_mdie *mdie;
661 
662 	if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
663 	    ie.num_pmkid != 1 || ie.pmkid == NULL) {
664 		wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
665 			   "FT 4-way handshake message 2/4");
666 		return -1;
667 	}
668 
669 	os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
670 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
671 		    sm->sup_pmk_r1_name, PMKID_LEN);
672 
673 	if (!kde->mdie || !kde->ftie) {
674 		wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
675 			   "message 2/4", kde->mdie ? "FTIE" : "MDIE");
676 		return -1;
677 	}
678 
679 	mdie = (struct rsn_mdie *) (kde->mdie + 2);
680 	if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
681 	    os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
682 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
683 		wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
684 		return -1;
685 	}
686 
687 	if (sm->assoc_resp_ftie &&
688 	    (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
689 	     os_memcmp(kde->ftie, sm->assoc_resp_ftie,
690 		       2 + sm->assoc_resp_ftie[1]) != 0)) {
691 		wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
692 		wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
693 			    kde->ftie, kde->ftie_len);
694 		wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
695 			    sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
696 		return -1;
697 	}
698 
699 	return 0;
700 }
701 #endif /* CONFIG_IEEE80211R */
702 
703 
704 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
705 				    struct wpa_state_machine *sm, int group)
706 {
707 	/* Supplicant reported a Michael MIC error */
708 	wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
709 			 "received EAPOL-Key Error Request "
710 			 "(STA detected Michael MIC failure (group=%d))",
711 			 group);
712 
713 	if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
714 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
715 				"ignore Michael MIC failure report since "
716 				"group cipher is not TKIP");
717 	} else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
718 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
719 				"ignore Michael MIC failure report since "
720 				"pairwise cipher is not TKIP");
721 	} else {
722 		if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
723 			return 1; /* STA entry was removed */
724 		sm->dot11RSNAStatsTKIPRemoteMICFailures++;
725 		wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
726 	}
727 
728 	/*
729 	 * Error report is not a request for a new key handshake, but since
730 	 * Authenticator may do it, let's change the keys now anyway.
731 	 */
732 	wpa_request_new_ptk(sm);
733 	return 0;
734 }
735 
736 
737 void wpa_receive(struct wpa_authenticator *wpa_auth,
738 		 struct wpa_state_machine *sm,
739 		 u8 *data, size_t data_len)
740 {
741 	struct ieee802_1x_hdr *hdr;
742 	struct wpa_eapol_key *key;
743 	u16 key_info, key_data_length;
744 	enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
745 	       SMK_M1, SMK_M3, SMK_ERROR } msg;
746 	char *msgtxt;
747 	struct wpa_eapol_ie_parse kde;
748 	int ft;
749 	const u8 *eapol_key_ie;
750 	size_t eapol_key_ie_len;
751 
752 	if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
753 		return;
754 
755 	if (data_len < sizeof(*hdr) + sizeof(*key))
756 		return;
757 
758 	hdr = (struct ieee802_1x_hdr *) data;
759 	key = (struct wpa_eapol_key *) (hdr + 1);
760 	key_info = WPA_GET_BE16(key->key_info);
761 	key_data_length = WPA_GET_BE16(key->key_data_length);
762 	wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
763 		   " key_info=0x%x type=%u key_data_length=%u",
764 		   MAC2STR(sm->addr), key_info, key->type, key_data_length);
765 	if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
766 		wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
767 			   "key_data overflow (%d > %lu)",
768 			   key_data_length,
769 			   (unsigned long) (data_len - sizeof(*hdr) -
770 					    sizeof(*key)));
771 		return;
772 	}
773 
774 	if (sm->wpa == WPA_VERSION_WPA2) {
775 		if (key->type == EAPOL_KEY_TYPE_WPA) {
776 			/*
777 			 * Some deployed station implementations seem to send
778 			 * msg 4/4 with incorrect type value in WPA2 mode.
779 			 */
780 			wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
781 				   "with unexpected WPA type in RSN mode");
782 		} else if (key->type != EAPOL_KEY_TYPE_RSN) {
783 			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
784 				   "unexpected type %d in RSN mode",
785 				   key->type);
786 			return;
787 		}
788 	} else {
789 		if (key->type != EAPOL_KEY_TYPE_WPA) {
790 			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
791 				   "unexpected type %d in WPA mode",
792 				   key->type);
793 			return;
794 		}
795 	}
796 
797 	wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
798 		    WPA_NONCE_LEN);
799 	wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
800 		    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
801 
802 	/* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
803 	 * are set */
804 
805 	if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
806 	    (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
807 		if (key_info & WPA_KEY_INFO_ERROR) {
808 			msg = SMK_ERROR;
809 			msgtxt = "SMK Error";
810 		} else {
811 			msg = SMK_M1;
812 			msgtxt = "SMK M1";
813 		}
814 	} else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
815 		msg = SMK_M3;
816 		msgtxt = "SMK M3";
817 	} else if (key_info & WPA_KEY_INFO_REQUEST) {
818 		msg = REQUEST;
819 		msgtxt = "Request";
820 	} else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
821 		msg = GROUP_2;
822 		msgtxt = "2/2 Group";
823 	} else if (key_data_length == 0) {
824 		msg = PAIRWISE_4;
825 		msgtxt = "4/4 Pairwise";
826 	} else {
827 		msg = PAIRWISE_2;
828 		msgtxt = "2/4 Pairwise";
829 	}
830 
831 	/* TODO: key_info type validation for PeerKey */
832 	if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
833 	    msg == GROUP_2) {
834 		u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
835 		if (sm->pairwise == WPA_CIPHER_CCMP ||
836 		    sm->pairwise == WPA_CIPHER_GCMP) {
837 			if (wpa_use_aes_cmac(sm) &&
838 			    ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
839 				wpa_auth_logger(wpa_auth, sm->addr,
840 						LOGGER_WARNING,
841 						"advertised support for "
842 						"AES-128-CMAC, but did not "
843 						"use it");
844 				return;
845 			}
846 
847 			if (!wpa_use_aes_cmac(sm) &&
848 			    ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
849 				wpa_auth_logger(wpa_auth, sm->addr,
850 						LOGGER_WARNING,
851 						"did not use HMAC-SHA1-AES "
852 						"with CCMP/GCMP");
853 				return;
854 			}
855 		}
856 	}
857 
858 	if (key_info & WPA_KEY_INFO_REQUEST) {
859 		if (sm->req_replay_counter_used &&
860 		    os_memcmp(key->replay_counter, sm->req_replay_counter,
861 			      WPA_REPLAY_COUNTER_LEN) <= 0) {
862 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
863 					"received EAPOL-Key request with "
864 					"replayed counter");
865 			return;
866 		}
867 	}
868 
869 	if (!(key_info & WPA_KEY_INFO_REQUEST) &&
870 	    !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
871 		int i;
872 
873 		if (msg == PAIRWISE_2 &&
874 		    wpa_replay_counter_valid(sm->prev_key_replay,
875 					     key->replay_counter) &&
876 		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
877 		    os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
878 		{
879 			/*
880 			 * Some supplicant implementations (e.g., Windows XP
881 			 * WZC) update SNonce for each EAPOL-Key 2/4. This
882 			 * breaks the workaround on accepting any of the
883 			 * pending requests, so allow the SNonce to be updated
884 			 * even if we have already sent out EAPOL-Key 3/4.
885 			 */
886 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
887 					 "Process SNonce update from STA "
888 					 "based on retransmitted EAPOL-Key "
889 					 "1/4");
890 			sm->update_snonce = 1;
891 			wpa_replay_counter_mark_invalid(sm->prev_key_replay,
892 							key->replay_counter);
893 			goto continue_processing;
894 		}
895 
896 		if (msg == PAIRWISE_2 &&
897 		    wpa_replay_counter_valid(sm->prev_key_replay,
898 					     key->replay_counter) &&
899 		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
900 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
901 					 "ignore retransmitted EAPOL-Key %s - "
902 					 "SNonce did not change", msgtxt);
903 		} else {
904 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
905 					 "received EAPOL-Key %s with "
906 					 "unexpected replay counter", msgtxt);
907 		}
908 		for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
909 			if (!sm->key_replay[i].valid)
910 				break;
911 			wpa_hexdump(MSG_DEBUG, "pending replay counter",
912 				    sm->key_replay[i].counter,
913 				    WPA_REPLAY_COUNTER_LEN);
914 		}
915 		wpa_hexdump(MSG_DEBUG, "received replay counter",
916 			    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
917 		return;
918 	}
919 
920 continue_processing:
921 	switch (msg) {
922 	case PAIRWISE_2:
923 		if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
924 		    sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
925 		    (!sm->update_snonce ||
926 		     sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
927 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
928 					 "received EAPOL-Key msg 2/4 in "
929 					 "invalid state (%d) - dropped",
930 					 sm->wpa_ptk_state);
931 			return;
932 		}
933 		random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
934 		if (sm->group->reject_4way_hs_for_entropy) {
935 			/*
936 			 * The system did not have enough entropy to generate
937 			 * strong random numbers. Reject the first 4-way
938 			 * handshake(s) and collect some entropy based on the
939 			 * information from it. Once enough entropy is
940 			 * available, the next atempt will trigger GMK/Key
941 			 * Counter update and the station will be allowed to
942 			 * continue.
943 			 */
944 			wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
945 				   "collect more entropy for random number "
946 				   "generation");
947 			random_mark_pool_ready();
948 			wpa_sta_disconnect(wpa_auth, sm->addr);
949 			return;
950 		}
951 		if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
952 				      &kde) < 0) {
953 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
954 					 "received EAPOL-Key msg 2/4 with "
955 					 "invalid Key Data contents");
956 			return;
957 		}
958 		if (kde.rsn_ie) {
959 			eapol_key_ie = kde.rsn_ie;
960 			eapol_key_ie_len = kde.rsn_ie_len;
961 		} else {
962 			eapol_key_ie = kde.wpa_ie;
963 			eapol_key_ie_len = kde.wpa_ie_len;
964 		}
965 		ft = sm->wpa == WPA_VERSION_WPA2 &&
966 			wpa_key_mgmt_ft(sm->wpa_key_mgmt);
967 		if (sm->wpa_ie == NULL ||
968 		    wpa_compare_rsn_ie(ft,
969 				       sm->wpa_ie, sm->wpa_ie_len,
970 				       eapol_key_ie, eapol_key_ie_len)) {
971 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
972 					"WPA IE from (Re)AssocReq did not "
973 					"match with msg 2/4");
974 			if (sm->wpa_ie) {
975 				wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
976 					    sm->wpa_ie, sm->wpa_ie_len);
977 			}
978 			wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
979 				    eapol_key_ie, eapol_key_ie_len);
980 			/* MLME-DEAUTHENTICATE.request */
981 			wpa_sta_disconnect(wpa_auth, sm->addr);
982 			return;
983 		}
984 #ifdef CONFIG_IEEE80211R
985 		if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
986 			wpa_sta_disconnect(wpa_auth, sm->addr);
987 			return;
988 		}
989 #endif /* CONFIG_IEEE80211R */
990 		break;
991 	case PAIRWISE_4:
992 		if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
993 		    !sm->PTK_valid) {
994 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
995 					 "received EAPOL-Key msg 4/4 in "
996 					 "invalid state (%d) - dropped",
997 					 sm->wpa_ptk_state);
998 			return;
999 		}
1000 		break;
1001 	case GROUP_2:
1002 		if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1003 		    || !sm->PTK_valid) {
1004 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1005 					 "received EAPOL-Key msg 2/2 in "
1006 					 "invalid state (%d) - dropped",
1007 					 sm->wpa_ptk_group_state);
1008 			return;
1009 		}
1010 		break;
1011 #ifdef CONFIG_PEERKEY
1012 	case SMK_M1:
1013 	case SMK_M3:
1014 	case SMK_ERROR:
1015 		if (!wpa_auth->conf.peerkey) {
1016 			wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1017 				   "PeerKey use disabled - ignoring message");
1018 			return;
1019 		}
1020 		if (!sm->PTK_valid) {
1021 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1022 					"received EAPOL-Key msg SMK in "
1023 					"invalid state - dropped");
1024 			return;
1025 		}
1026 		break;
1027 #else /* CONFIG_PEERKEY */
1028 	case SMK_M1:
1029 	case SMK_M3:
1030 	case SMK_ERROR:
1031 		return; /* STSL disabled - ignore SMK messages */
1032 #endif /* CONFIG_PEERKEY */
1033 	case REQUEST:
1034 		break;
1035 	}
1036 
1037 	wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1038 			 "received EAPOL-Key frame (%s)", msgtxt);
1039 
1040 	if (key_info & WPA_KEY_INFO_ACK) {
1041 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1042 				"received invalid EAPOL-Key: Key Ack set");
1043 		return;
1044 	}
1045 
1046 	if (!(key_info & WPA_KEY_INFO_MIC)) {
1047 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1048 				"received invalid EAPOL-Key: Key MIC not set");
1049 		return;
1050 	}
1051 
1052 	sm->MICVerified = FALSE;
1053 	if (sm->PTK_valid && !sm->update_snonce) {
1054 		if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1055 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1056 					"received EAPOL-Key with invalid MIC");
1057 			return;
1058 		}
1059 		sm->MICVerified = TRUE;
1060 		eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1061 		sm->pending_1_of_4_timeout = 0;
1062 	}
1063 
1064 	if (key_info & WPA_KEY_INFO_REQUEST) {
1065 		if (sm->MICVerified) {
1066 			sm->req_replay_counter_used = 1;
1067 			os_memcpy(sm->req_replay_counter, key->replay_counter,
1068 				  WPA_REPLAY_COUNTER_LEN);
1069 		} else {
1070 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1071 					"received EAPOL-Key request with "
1072 					"invalid MIC");
1073 			return;
1074 		}
1075 
1076 		/*
1077 		 * TODO: should decrypt key data field if encryption was used;
1078 		 * even though MAC address KDE is not normally encrypted,
1079 		 * supplicant is allowed to encrypt it.
1080 		 */
1081 		if (msg == SMK_ERROR) {
1082 #ifdef CONFIG_PEERKEY
1083 			wpa_smk_error(wpa_auth, sm, key);
1084 #endif /* CONFIG_PEERKEY */
1085 			return;
1086 		} else if (key_info & WPA_KEY_INFO_ERROR) {
1087 			if (wpa_receive_error_report(
1088 				    wpa_auth, sm,
1089 				    !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1090 				return; /* STA entry was removed */
1091 		} else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1092 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1093 					"received EAPOL-Key Request for new "
1094 					"4-Way Handshake");
1095 			wpa_request_new_ptk(sm);
1096 #ifdef CONFIG_PEERKEY
1097 		} else if (msg == SMK_M1) {
1098 			wpa_smk_m1(wpa_auth, sm, key);
1099 #endif /* CONFIG_PEERKEY */
1100 		} else if (key_data_length > 0 &&
1101 			   wpa_parse_kde_ies((const u8 *) (key + 1),
1102 					     key_data_length, &kde) == 0 &&
1103 			   kde.mac_addr) {
1104 		} else {
1105 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1106 					"received EAPOL-Key Request for GTK "
1107 					"rekeying");
1108 			eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1109 			wpa_rekey_gtk(wpa_auth, NULL);
1110 		}
1111 	} else {
1112 		/* Do not allow the same key replay counter to be reused. */
1113 		wpa_replay_counter_mark_invalid(sm->key_replay,
1114 						key->replay_counter);
1115 
1116 		if (msg == PAIRWISE_2) {
1117 			/*
1118 			 * Maintain a copy of the pending EAPOL-Key frames in
1119 			 * case the EAPOL-Key frame was retransmitted. This is
1120 			 * needed to allow EAPOL-Key msg 2/4 reply to another
1121 			 * pending msg 1/4 to update the SNonce to work around
1122 			 * unexpected supplicant behavior.
1123 			 */
1124 			os_memcpy(sm->prev_key_replay, sm->key_replay,
1125 				  sizeof(sm->key_replay));
1126 		} else {
1127 			os_memset(sm->prev_key_replay, 0,
1128 				  sizeof(sm->prev_key_replay));
1129 		}
1130 
1131 		/*
1132 		 * Make sure old valid counters are not accepted anymore and
1133 		 * do not get copied again.
1134 		 */
1135 		wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1136 	}
1137 
1138 #ifdef CONFIG_PEERKEY
1139 	if (msg == SMK_M3) {
1140 		wpa_smk_m3(wpa_auth, sm, key);
1141 		return;
1142 	}
1143 #endif /* CONFIG_PEERKEY */
1144 
1145 	os_free(sm->last_rx_eapol_key);
1146 	sm->last_rx_eapol_key = os_malloc(data_len);
1147 	if (sm->last_rx_eapol_key == NULL)
1148 		return;
1149 	os_memcpy(sm->last_rx_eapol_key, data, data_len);
1150 	sm->last_rx_eapol_key_len = data_len;
1151 
1152 	sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1153 	sm->EAPOLKeyReceived = TRUE;
1154 	sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1155 	sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1156 	os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1157 	wpa_sm_step(sm);
1158 }
1159 
1160 
1161 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1162 			  const u8 *gnonce, u8 *gtk, size_t gtk_len)
1163 {
1164 	u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1165 	u8 *pos;
1166 	int ret = 0;
1167 
1168 	/* GTK = PRF-X(GMK, "Group key expansion",
1169 	 *	AA || GNonce || Time || random data)
1170 	 * The example described in the IEEE 802.11 standard uses only AA and
1171 	 * GNonce as inputs here. Add some more entropy since this derivation
1172 	 * is done only at the Authenticator and as such, does not need to be
1173 	 * exactly same.
1174 	 */
1175 	os_memcpy(data, addr, ETH_ALEN);
1176 	os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1177 	pos = data + ETH_ALEN + WPA_NONCE_LEN;
1178 	wpa_get_ntp_timestamp(pos);
1179 	pos += 8;
1180 	if (random_get_bytes(pos, 16) < 0)
1181 		ret = -1;
1182 
1183 #ifdef CONFIG_IEEE80211W
1184 	sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1185 #else /* CONFIG_IEEE80211W */
1186 	if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1187 	    < 0)
1188 		ret = -1;
1189 #endif /* CONFIG_IEEE80211W */
1190 
1191 	return ret;
1192 }
1193 
1194 
1195 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1196 {
1197 	struct wpa_authenticator *wpa_auth = eloop_ctx;
1198 	struct wpa_state_machine *sm = timeout_ctx;
1199 
1200 	sm->pending_1_of_4_timeout = 0;
1201 	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1202 	sm->TimeoutEvt = TRUE;
1203 	wpa_sm_step(sm);
1204 }
1205 
1206 
1207 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1208 		      struct wpa_state_machine *sm, int key_info,
1209 		      const u8 *key_rsc, const u8 *nonce,
1210 		      const u8 *kde, size_t kde_len,
1211 		      int keyidx, int encr, int force_version)
1212 {
1213 	struct ieee802_1x_hdr *hdr;
1214 	struct wpa_eapol_key *key;
1215 	size_t len;
1216 	int alg;
1217 	int key_data_len, pad_len = 0;
1218 	u8 *buf, *pos;
1219 	int version, pairwise;
1220 	int i;
1221 
1222 	len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1223 
1224 	if (force_version)
1225 		version = force_version;
1226 	else if (wpa_use_aes_cmac(sm))
1227 		version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1228 	else if (sm->pairwise != WPA_CIPHER_TKIP)
1229 		version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1230 	else
1231 		version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1232 
1233 	pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1234 
1235 	wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1236 		   "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1237 		   "encr=%d)",
1238 		   version,
1239 		   (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1240 		   (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1241 		   (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1242 		   (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1243 		   pairwise, (unsigned long) kde_len, keyidx, encr);
1244 
1245 	key_data_len = kde_len;
1246 
1247 	if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1248 	     version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1249 		pad_len = key_data_len % 8;
1250 		if (pad_len)
1251 			pad_len = 8 - pad_len;
1252 		key_data_len += pad_len + 8;
1253 	}
1254 
1255 	len += key_data_len;
1256 
1257 	hdr = os_zalloc(len);
1258 	if (hdr == NULL)
1259 		return;
1260 	hdr->version = wpa_auth->conf.eapol_version;
1261 	hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1262 	hdr->length = host_to_be16(len  - sizeof(*hdr));
1263 	key = (struct wpa_eapol_key *) (hdr + 1);
1264 
1265 	key->type = sm->wpa == WPA_VERSION_WPA2 ?
1266 		EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1267 	key_info |= version;
1268 	if (encr && sm->wpa == WPA_VERSION_WPA2)
1269 		key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1270 	if (sm->wpa != WPA_VERSION_WPA2)
1271 		key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1272 	WPA_PUT_BE16(key->key_info, key_info);
1273 
1274 	alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1275 	WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1276 	if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1277 		WPA_PUT_BE16(key->key_length, 0);
1278 
1279 	/* FIX: STSL: what to use as key_replay_counter? */
1280 	for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1281 		sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1282 		os_memcpy(sm->key_replay[i].counter,
1283 			  sm->key_replay[i - 1].counter,
1284 			  WPA_REPLAY_COUNTER_LEN);
1285 	}
1286 	inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1287 	os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1288 		  WPA_REPLAY_COUNTER_LEN);
1289 	sm->key_replay[0].valid = TRUE;
1290 
1291 	if (nonce)
1292 		os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1293 
1294 	if (key_rsc)
1295 		os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1296 
1297 	if (kde && !encr) {
1298 		os_memcpy(key + 1, kde, kde_len);
1299 		WPA_PUT_BE16(key->key_data_length, kde_len);
1300 	} else if (encr && kde) {
1301 		buf = os_zalloc(key_data_len);
1302 		if (buf == NULL) {
1303 			os_free(hdr);
1304 			return;
1305 		}
1306 		pos = buf;
1307 		os_memcpy(pos, kde, kde_len);
1308 		pos += kde_len;
1309 
1310 		if (pad_len)
1311 			*pos++ = 0xdd;
1312 
1313 		wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1314 				buf, key_data_len);
1315 		if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1316 		    version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1317 			if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1318 				     (u8 *) (key + 1))) {
1319 				os_free(hdr);
1320 				os_free(buf);
1321 				return;
1322 			}
1323 			WPA_PUT_BE16(key->key_data_length, key_data_len);
1324 		} else {
1325 			u8 ek[32];
1326 			os_memcpy(key->key_iv,
1327 				  sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1328 			inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1329 			os_memcpy(ek, key->key_iv, 16);
1330 			os_memcpy(ek + 16, sm->PTK.kek, 16);
1331 			os_memcpy(key + 1, buf, key_data_len);
1332 			rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1333 			WPA_PUT_BE16(key->key_data_length, key_data_len);
1334 		}
1335 		os_free(buf);
1336 	}
1337 
1338 	if (key_info & WPA_KEY_INFO_MIC) {
1339 		if (!sm->PTK_valid) {
1340 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1341 					"PTK not valid when sending EAPOL-Key "
1342 					"frame");
1343 			os_free(hdr);
1344 			return;
1345 		}
1346 		wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1347 				  key->key_mic);
1348 	}
1349 
1350 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1351 			   1);
1352 	wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1353 			    sm->pairwise_set);
1354 	os_free(hdr);
1355 }
1356 
1357 
1358 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1359 			   struct wpa_state_machine *sm, int key_info,
1360 			   const u8 *key_rsc, const u8 *nonce,
1361 			   const u8 *kde, size_t kde_len,
1362 			   int keyidx, int encr)
1363 {
1364 	int timeout_ms;
1365 	int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1366 	int ctr;
1367 
1368 	if (sm == NULL)
1369 		return;
1370 
1371 	__wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1372 			 keyidx, encr, 0);
1373 
1374 	ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1375 	if (ctr == 1 && wpa_auth->conf.tx_status)
1376 		timeout_ms = pairwise ? eapol_key_timeout_first :
1377 			eapol_key_timeout_first_group;
1378 	else
1379 		timeout_ms = eapol_key_timeout_subseq;
1380 	if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1381 		sm->pending_1_of_4_timeout = 1;
1382 	wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1383 		   "counter %d)", timeout_ms, ctr);
1384 	eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1385 			       wpa_send_eapol_timeout, wpa_auth, sm);
1386 }
1387 
1388 
1389 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1390 {
1391 	struct ieee802_1x_hdr *hdr;
1392 	struct wpa_eapol_key *key;
1393 	u16 key_info;
1394 	int ret = 0;
1395 	u8 mic[16];
1396 
1397 	if (data_len < sizeof(*hdr) + sizeof(*key))
1398 		return -1;
1399 
1400 	hdr = (struct ieee802_1x_hdr *) data;
1401 	key = (struct wpa_eapol_key *) (hdr + 1);
1402 	key_info = WPA_GET_BE16(key->key_info);
1403 	os_memcpy(mic, key->key_mic, 16);
1404 	os_memset(key->key_mic, 0, 16);
1405 	if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1406 			      data, data_len, key->key_mic) ||
1407 	    os_memcmp(mic, key->key_mic, 16) != 0)
1408 		ret = -1;
1409 	os_memcpy(key->key_mic, mic, 16);
1410 	return ret;
1411 }
1412 
1413 
1414 void wpa_remove_ptk(struct wpa_state_machine *sm)
1415 {
1416 	sm->PTK_valid = FALSE;
1417 	os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1418 	wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1419 	sm->pairwise_set = FALSE;
1420 	eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1421 }
1422 
1423 
1424 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1425 {
1426 	int remove_ptk = 1;
1427 
1428 	if (sm == NULL)
1429 		return -1;
1430 
1431 	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1432 			 "event %d notification", event);
1433 
1434 	switch (event) {
1435 	case WPA_AUTH:
1436 	case WPA_ASSOC:
1437 		break;
1438 	case WPA_DEAUTH:
1439 	case WPA_DISASSOC:
1440 		sm->DeauthenticationRequest = TRUE;
1441 		break;
1442 	case WPA_REAUTH:
1443 	case WPA_REAUTH_EAPOL:
1444 		if (!sm->started) {
1445 			/*
1446 			 * When using WPS, we may end up here if the STA
1447 			 * manages to re-associate without the previous STA
1448 			 * entry getting removed. Consequently, we need to make
1449 			 * sure that the WPA state machines gets initialized
1450 			 * properly at this point.
1451 			 */
1452 			wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1453 				   "started - initialize now");
1454 			sm->started = 1;
1455 			sm->Init = TRUE;
1456 			if (wpa_sm_step(sm) == 1)
1457 				return 1; /* should not really happen */
1458 			sm->Init = FALSE;
1459 			sm->AuthenticationRequest = TRUE;
1460 			break;
1461 		}
1462 		if (sm->GUpdateStationKeys) {
1463 			/*
1464 			 * Reauthentication cancels the pending group key
1465 			 * update for this STA.
1466 			 */
1467 			sm->group->GKeyDoneStations--;
1468 			sm->GUpdateStationKeys = FALSE;
1469 			sm->PtkGroupInit = TRUE;
1470 		}
1471 		sm->ReAuthenticationRequest = TRUE;
1472 		break;
1473 	case WPA_ASSOC_FT:
1474 #ifdef CONFIG_IEEE80211R
1475 		wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1476 			   "after association");
1477 		wpa_ft_install_ptk(sm);
1478 
1479 		/* Using FT protocol, not WPA auth state machine */
1480 		sm->ft_completed = 1;
1481 		return 0;
1482 #else /* CONFIG_IEEE80211R */
1483 		break;
1484 #endif /* CONFIG_IEEE80211R */
1485 	}
1486 
1487 #ifdef CONFIG_IEEE80211R
1488 	sm->ft_completed = 0;
1489 #endif /* CONFIG_IEEE80211R */
1490 
1491 #ifdef CONFIG_IEEE80211W
1492 	if (sm->mgmt_frame_prot && event == WPA_AUTH)
1493 		remove_ptk = 0;
1494 #endif /* CONFIG_IEEE80211W */
1495 
1496 	if (remove_ptk) {
1497 		sm->PTK_valid = FALSE;
1498 		os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1499 
1500 		if (event != WPA_REAUTH_EAPOL)
1501 			wpa_remove_ptk(sm);
1502 	}
1503 
1504 	return wpa_sm_step(sm);
1505 }
1506 
1507 
1508 SM_STATE(WPA_PTK, INITIALIZE)
1509 {
1510 	SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1511 	if (sm->Init) {
1512 		/* Init flag is not cleared here, so avoid busy
1513 		 * loop by claiming nothing changed. */
1514 		sm->changed = FALSE;
1515 	}
1516 
1517 	sm->keycount = 0;
1518 	if (sm->GUpdateStationKeys)
1519 		sm->group->GKeyDoneStations--;
1520 	sm->GUpdateStationKeys = FALSE;
1521 	if (sm->wpa == WPA_VERSION_WPA)
1522 		sm->PInitAKeys = FALSE;
1523 	if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1524 	       * Local AA > Remote AA)) */) {
1525 		sm->Pair = TRUE;
1526 	}
1527 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1528 	wpa_remove_ptk(sm);
1529 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1530 	sm->TimeoutCtr = 0;
1531 	if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1532 		wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1533 				   WPA_EAPOL_authorized, 0);
1534 	}
1535 }
1536 
1537 
1538 SM_STATE(WPA_PTK, DISCONNECT)
1539 {
1540 	SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1541 	sm->Disconnect = FALSE;
1542 	wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1543 }
1544 
1545 
1546 SM_STATE(WPA_PTK, DISCONNECTED)
1547 {
1548 	SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1549 	sm->DeauthenticationRequest = FALSE;
1550 }
1551 
1552 
1553 SM_STATE(WPA_PTK, AUTHENTICATION)
1554 {
1555 	SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1556 	os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1557 	sm->PTK_valid = FALSE;
1558 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1559 			   1);
1560 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1561 	sm->AuthenticationRequest = FALSE;
1562 }
1563 
1564 
1565 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1566 				  struct wpa_group *group)
1567 {
1568 	if (group->first_sta_seen)
1569 		return;
1570 	/*
1571 	 * System has run bit further than at the time hostapd was started
1572 	 * potentially very early during boot up. This provides better chances
1573 	 * of collecting more randomness on embedded systems. Re-initialize the
1574 	 * GMK and Counter here to improve their strength if there was not
1575 	 * enough entropy available immediately after system startup.
1576 	 */
1577 	wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1578 		   "station");
1579 	if (random_pool_ready() != 1) {
1580 		wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1581 			   "to proceed - reject first 4-way handshake");
1582 		group->reject_4way_hs_for_entropy = TRUE;
1583 	} else {
1584 		group->first_sta_seen = TRUE;
1585 		group->reject_4way_hs_for_entropy = FALSE;
1586 	}
1587 
1588 	wpa_group_init_gmk_and_counter(wpa_auth, group);
1589 	wpa_gtk_update(wpa_auth, group);
1590 	wpa_group_config_group_keys(wpa_auth, group);
1591 }
1592 
1593 
1594 SM_STATE(WPA_PTK, AUTHENTICATION2)
1595 {
1596 	SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1597 
1598 	wpa_group_ensure_init(sm->wpa_auth, sm->group);
1599 
1600 	/*
1601 	 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1602 	 * ambiguous. The Authenticator state machine uses a counter that is
1603 	 * incremented by one for each 4-way handshake. However, the security
1604 	 * analysis of 4-way handshake points out that unpredictable nonces
1605 	 * help in preventing precomputation attacks. Instead of the state
1606 	 * machine definition, use an unpredictable nonce value here to provide
1607 	 * stronger protection against potential precomputation attacks.
1608 	 */
1609 	if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1610 		wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1611 			   "ANonce.");
1612 		wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1613 		return;
1614 	}
1615 	wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1616 		    WPA_NONCE_LEN);
1617 	sm->ReAuthenticationRequest = FALSE;
1618 	/* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1619 	 * logical place than INITIALIZE since AUTHENTICATION2 can be
1620 	 * re-entered on ReAuthenticationRequest without going through
1621 	 * INITIALIZE. */
1622 	sm->TimeoutCtr = 0;
1623 }
1624 
1625 
1626 SM_STATE(WPA_PTK, INITPMK)
1627 {
1628 	u8 msk[2 * PMK_LEN];
1629 	size_t len = 2 * PMK_LEN;
1630 
1631 	SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1632 #ifdef CONFIG_IEEE80211R
1633 	sm->xxkey_len = 0;
1634 #endif /* CONFIG_IEEE80211R */
1635 	if (sm->pmksa) {
1636 		wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1637 		os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1638 	} else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1639 		wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1640 			   "(len=%lu)", (unsigned long) len);
1641 		os_memcpy(sm->PMK, msk, PMK_LEN);
1642 #ifdef CONFIG_IEEE80211R
1643 		if (len >= 2 * PMK_LEN) {
1644 			os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1645 			sm->xxkey_len = PMK_LEN;
1646 		}
1647 #endif /* CONFIG_IEEE80211R */
1648 	} else {
1649 		wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1650 	}
1651 
1652 	sm->req_replay_counter_used = 0;
1653 	/* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1654 	 * will break reauthentication since EAPOL state machines may not be
1655 	 * get into AUTHENTICATING state that clears keyRun before WPA state
1656 	 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1657 	 * state and takes PMK from the previously used AAA Key. This will
1658 	 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1659 	 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1660 	 * be good workaround for this issue. */
1661 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1662 }
1663 
1664 
1665 SM_STATE(WPA_PTK, INITPSK)
1666 {
1667 	const u8 *psk;
1668 	SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1669 	psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL);
1670 	if (psk) {
1671 		os_memcpy(sm->PMK, psk, PMK_LEN);
1672 #ifdef CONFIG_IEEE80211R
1673 		os_memcpy(sm->xxkey, psk, PMK_LEN);
1674 		sm->xxkey_len = PMK_LEN;
1675 #endif /* CONFIG_IEEE80211R */
1676 	}
1677 	sm->req_replay_counter_used = 0;
1678 }
1679 
1680 
1681 SM_STATE(WPA_PTK, PTKSTART)
1682 {
1683 	u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1684 	size_t pmkid_len = 0;
1685 
1686 	SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1687 	sm->PTKRequest = FALSE;
1688 	sm->TimeoutEvt = FALSE;
1689 
1690 	sm->TimeoutCtr++;
1691 	if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1692 		/* No point in sending the EAPOL-Key - we will disconnect
1693 		 * immediately following this. */
1694 		return;
1695 	}
1696 
1697 	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1698 			"sending 1/4 msg of 4-Way Handshake");
1699 	/*
1700 	 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1701 	 * one possible PSK for this STA.
1702 	 */
1703 	if (sm->wpa == WPA_VERSION_WPA2 &&
1704 	    wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1705 		pmkid = buf;
1706 		pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1707 		pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1708 		pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1709 		RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1710 		if (sm->pmksa)
1711 			os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1712 				  sm->pmksa->pmkid, PMKID_LEN);
1713 		else {
1714 			/*
1715 			 * Calculate PMKID since no PMKSA cache entry was
1716 			 * available with pre-calculated PMKID.
1717 			 */
1718 			rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1719 				  sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1720 				  wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1721 		}
1722 	}
1723 	wpa_send_eapol(sm->wpa_auth, sm,
1724 		       WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1725 		       sm->ANonce, pmkid, pmkid_len, 0, 0);
1726 }
1727 
1728 
1729 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1730 			  struct wpa_ptk *ptk)
1731 {
1732 	size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64;
1733 #ifdef CONFIG_IEEE80211R
1734 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1735 		return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1736 #endif /* CONFIG_IEEE80211R */
1737 
1738 	wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1739 		       sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1740 		       (u8 *) ptk, ptk_len,
1741 		       wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1742 
1743 	return 0;
1744 }
1745 
1746 
1747 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1748 {
1749 	struct wpa_ptk PTK;
1750 	int ok = 0;
1751 	const u8 *pmk = NULL;
1752 
1753 	SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1754 	sm->EAPOLKeyReceived = FALSE;
1755 	sm->update_snonce = FALSE;
1756 
1757 	/* WPA with IEEE 802.1X: use the derived PMK from EAP
1758 	 * WPA-PSK: iterate through possible PSKs and select the one matching
1759 	 * the packet */
1760 	for (;;) {
1761 		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1762 			pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk);
1763 			if (pmk == NULL)
1764 				break;
1765 		} else
1766 			pmk = sm->PMK;
1767 
1768 		wpa_derive_ptk(sm, pmk, &PTK);
1769 
1770 		if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1771 				       sm->last_rx_eapol_key_len) == 0) {
1772 			ok = 1;
1773 			break;
1774 		}
1775 
1776 		if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1777 			break;
1778 	}
1779 
1780 	if (!ok) {
1781 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1782 				"invalid MIC in msg 2/4 of 4-Way Handshake");
1783 		return;
1784 	}
1785 
1786 #ifdef CONFIG_IEEE80211R
1787 	if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1788 		/*
1789 		 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1790 		 * with the value we derived.
1791 		 */
1792 		if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1793 			      WPA_PMK_NAME_LEN) != 0) {
1794 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1795 					"PMKR1Name mismatch in FT 4-way "
1796 					"handshake");
1797 			wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1798 				    "Supplicant",
1799 				    sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1800 			wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1801 				    sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1802 			return;
1803 		}
1804 	}
1805 #endif /* CONFIG_IEEE80211R */
1806 
1807 	sm->pending_1_of_4_timeout = 0;
1808 	eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1809 
1810 	if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1811 		/* PSK may have changed from the previous choice, so update
1812 		 * state machine data based on whatever PSK was selected here.
1813 		 */
1814 		os_memcpy(sm->PMK, pmk, PMK_LEN);
1815 	}
1816 
1817 	sm->MICVerified = TRUE;
1818 
1819 	os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1820 	sm->PTK_valid = TRUE;
1821 }
1822 
1823 
1824 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1825 {
1826 	SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1827 	sm->TimeoutCtr = 0;
1828 }
1829 
1830 
1831 #ifdef CONFIG_IEEE80211W
1832 
1833 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1834 {
1835 	if (sm->mgmt_frame_prot) {
1836 		return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1837 	}
1838 
1839 	return 0;
1840 }
1841 
1842 
1843 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1844 {
1845 	struct wpa_igtk_kde igtk;
1846 	struct wpa_group *gsm = sm->group;
1847 
1848 	if (!sm->mgmt_frame_prot)
1849 		return pos;
1850 
1851 	igtk.keyid[0] = gsm->GN_igtk;
1852 	igtk.keyid[1] = 0;
1853 	if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1854 	    wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0)
1855 		os_memset(igtk.pn, 0, sizeof(igtk.pn));
1856 	os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1857 	if (sm->wpa_auth->conf.disable_gtk) {
1858 		/*
1859 		 * Provide unique random IGTK to each STA to prevent use of
1860 		 * IGTK in the BSS.
1861 		 */
1862 		if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0)
1863 			return pos;
1864 	}
1865 	pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1866 			  (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1867 
1868 	return pos;
1869 }
1870 
1871 #else /* CONFIG_IEEE80211W */
1872 
1873 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1874 {
1875 	return 0;
1876 }
1877 
1878 
1879 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1880 {
1881 	return pos;
1882 }
1883 
1884 #endif /* CONFIG_IEEE80211W */
1885 
1886 
1887 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1888 {
1889 	u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1890 	size_t gtk_len, kde_len;
1891 	struct wpa_group *gsm = sm->group;
1892 	u8 *wpa_ie;
1893 	int wpa_ie_len, secure, keyidx, encr = 0;
1894 
1895 	SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1896 	sm->TimeoutEvt = FALSE;
1897 
1898 	sm->TimeoutCtr++;
1899 	if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1900 		/* No point in sending the EAPOL-Key - we will disconnect
1901 		 * immediately following this. */
1902 		return;
1903 	}
1904 
1905 	/* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1906 	   GTK[GN], IGTK, [FTIE], [TIE * 2])
1907 	 */
1908 	os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1909 	wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1910 	/* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1911 	wpa_ie = sm->wpa_auth->wpa_ie;
1912 	wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1913 	if (sm->wpa == WPA_VERSION_WPA &&
1914 	    (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1915 	    wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1916 		/* WPA-only STA, remove RSN IE */
1917 		wpa_ie = wpa_ie + wpa_ie[1] + 2;
1918 		wpa_ie_len = wpa_ie[1] + 2;
1919 	}
1920 	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1921 			"sending 3/4 msg of 4-Way Handshake");
1922 	if (sm->wpa == WPA_VERSION_WPA2) {
1923 		/* WPA2 send GTK in the 4-way handshake */
1924 		secure = 1;
1925 		gtk = gsm->GTK[gsm->GN - 1];
1926 		gtk_len = gsm->GTK_len;
1927 		if (sm->wpa_auth->conf.disable_gtk) {
1928 			/*
1929 			 * Provide unique random GTK to each STA to prevent use
1930 			 * of GTK in the BSS.
1931 			 */
1932 			if (random_get_bytes(dummy_gtk, gtk_len) < 0)
1933 				return;
1934 			gtk = dummy_gtk;
1935 		}
1936 		keyidx = gsm->GN;
1937 		_rsc = rsc;
1938 		encr = 1;
1939 	} else {
1940 		/* WPA does not include GTK in msg 3/4 */
1941 		secure = 0;
1942 		gtk = NULL;
1943 		gtk_len = 0;
1944 		keyidx = 0;
1945 		_rsc = NULL;
1946 		if (sm->rx_eapol_key_secure) {
1947 			/*
1948 			 * It looks like Windows 7 supplicant tries to use
1949 			 * Secure bit in msg 2/4 after having reported Michael
1950 			 * MIC failure and it then rejects the 4-way handshake
1951 			 * if msg 3/4 does not set Secure bit. Work around this
1952 			 * by setting the Secure bit here even in the case of
1953 			 * WPA if the supplicant used it first.
1954 			 */
1955 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1956 					"STA used Secure bit in WPA msg 2/4 - "
1957 					"set Secure for 3/4 as workaround");
1958 			secure = 1;
1959 		}
1960 	}
1961 
1962 	kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
1963 	if (gtk)
1964 		kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
1965 #ifdef CONFIG_IEEE80211R
1966 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1967 		kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
1968 		kde_len += 300; /* FTIE + 2 * TIE */
1969 	}
1970 #endif /* CONFIG_IEEE80211R */
1971 	kde = os_malloc(kde_len);
1972 	if (kde == NULL)
1973 		return;
1974 
1975 	pos = kde;
1976 	os_memcpy(pos, wpa_ie, wpa_ie_len);
1977 	pos += wpa_ie_len;
1978 #ifdef CONFIG_IEEE80211R
1979 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1980 		int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
1981 		if (res < 0) {
1982 			wpa_printf(MSG_ERROR, "FT: Failed to insert "
1983 				   "PMKR1Name into RSN IE in EAPOL-Key data");
1984 			os_free(kde);
1985 			return;
1986 		}
1987 		pos += res;
1988 	}
1989 #endif /* CONFIG_IEEE80211R */
1990 	if (gtk) {
1991 		u8 hdr[2];
1992 		hdr[0] = keyidx & 0x03;
1993 		hdr[1] = 0;
1994 		pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
1995 				  gtk, gtk_len);
1996 	}
1997 	pos = ieee80211w_kde_add(sm, pos);
1998 
1999 #ifdef CONFIG_IEEE80211R
2000 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2001 		int res;
2002 		struct wpa_auth_config *conf;
2003 
2004 		conf = &sm->wpa_auth->conf;
2005 		res = wpa_write_ftie(conf, conf->r0_key_holder,
2006 				     conf->r0_key_holder_len,
2007 				     NULL, NULL, pos, kde + kde_len - pos,
2008 				     NULL, 0);
2009 		if (res < 0) {
2010 			wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2011 				   "into EAPOL-Key Key Data");
2012 			os_free(kde);
2013 			return;
2014 		}
2015 		pos += res;
2016 
2017 		/* TIE[ReassociationDeadline] (TU) */
2018 		*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2019 		*pos++ = 5;
2020 		*pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2021 		WPA_PUT_LE32(pos, conf->reassociation_deadline);
2022 		pos += 4;
2023 
2024 		/* TIE[KeyLifetime] (seconds) */
2025 		*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2026 		*pos++ = 5;
2027 		*pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2028 		WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2029 		pos += 4;
2030 	}
2031 #endif /* CONFIG_IEEE80211R */
2032 
2033 	wpa_send_eapol(sm->wpa_auth, sm,
2034 		       (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2035 		       WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2036 		       WPA_KEY_INFO_KEY_TYPE,
2037 		       _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2038 	os_free(kde);
2039 }
2040 
2041 
2042 SM_STATE(WPA_PTK, PTKINITDONE)
2043 {
2044 	SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2045 	sm->EAPOLKeyReceived = FALSE;
2046 	if (sm->Pair) {
2047 		enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2048 		int klen = wpa_cipher_key_len(sm->pairwise);
2049 		if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2050 				     sm->PTK.tk1, klen)) {
2051 			wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2052 			return;
2053 		}
2054 		/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2055 		sm->pairwise_set = TRUE;
2056 
2057 		if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2058 			eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2059 			eloop_register_timeout(sm->wpa_auth->conf.
2060 					       wpa_ptk_rekey, 0, wpa_rekey_ptk,
2061 					       sm->wpa_auth, sm);
2062 		}
2063 
2064 		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2065 			wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2066 					   WPA_EAPOL_authorized, 1);
2067 		}
2068 	}
2069 
2070 	if (0 /* IBSS == TRUE */) {
2071 		sm->keycount++;
2072 		if (sm->keycount == 2) {
2073 			wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2074 					   WPA_EAPOL_portValid, 1);
2075 		}
2076 	} else {
2077 		wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2078 				   1);
2079 	}
2080 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2081 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2082 	if (sm->wpa == WPA_VERSION_WPA)
2083 		sm->PInitAKeys = TRUE;
2084 	else
2085 		sm->has_GTK = TRUE;
2086 	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2087 			 "pairwise key handshake completed (%s)",
2088 			 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2089 
2090 #ifdef CONFIG_IEEE80211R
2091 	wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2092 #endif /* CONFIG_IEEE80211R */
2093 }
2094 
2095 
2096 SM_STEP(WPA_PTK)
2097 {
2098 	struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2099 
2100 	if (sm->Init)
2101 		SM_ENTER(WPA_PTK, INITIALIZE);
2102 	else if (sm->Disconnect
2103 		 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2104 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2105 				"WPA_PTK: sm->Disconnect");
2106 		SM_ENTER(WPA_PTK, DISCONNECT);
2107 	}
2108 	else if (sm->DeauthenticationRequest)
2109 		SM_ENTER(WPA_PTK, DISCONNECTED);
2110 	else if (sm->AuthenticationRequest)
2111 		SM_ENTER(WPA_PTK, AUTHENTICATION);
2112 	else if (sm->ReAuthenticationRequest)
2113 		SM_ENTER(WPA_PTK, AUTHENTICATION2);
2114 	else if (sm->PTKRequest)
2115 		SM_ENTER(WPA_PTK, PTKSTART);
2116 	else switch (sm->wpa_ptk_state) {
2117 	case WPA_PTK_INITIALIZE:
2118 		break;
2119 	case WPA_PTK_DISCONNECT:
2120 		SM_ENTER(WPA_PTK, DISCONNECTED);
2121 		break;
2122 	case WPA_PTK_DISCONNECTED:
2123 		SM_ENTER(WPA_PTK, INITIALIZE);
2124 		break;
2125 	case WPA_PTK_AUTHENTICATION:
2126 		SM_ENTER(WPA_PTK, AUTHENTICATION2);
2127 		break;
2128 	case WPA_PTK_AUTHENTICATION2:
2129 		if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2130 		    wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2131 				       WPA_EAPOL_keyRun) > 0)
2132 			SM_ENTER(WPA_PTK, INITPMK);
2133 		else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2134 			 /* FIX: && 802.1X::keyRun */)
2135 			SM_ENTER(WPA_PTK, INITPSK);
2136 		break;
2137 	case WPA_PTK_INITPMK:
2138 		if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2139 				       WPA_EAPOL_keyAvailable) > 0)
2140 			SM_ENTER(WPA_PTK, PTKSTART);
2141 		else {
2142 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2143 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2144 					"INITPMK - keyAvailable = false");
2145 			SM_ENTER(WPA_PTK, DISCONNECT);
2146 		}
2147 		break;
2148 	case WPA_PTK_INITPSK:
2149 		if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL))
2150 			SM_ENTER(WPA_PTK, PTKSTART);
2151 		else {
2152 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2153 					"no PSK configured for the STA");
2154 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2155 			SM_ENTER(WPA_PTK, DISCONNECT);
2156 		}
2157 		break;
2158 	case WPA_PTK_PTKSTART:
2159 		if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2160 		    sm->EAPOLKeyPairwise)
2161 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2162 		else if (sm->TimeoutCtr >
2163 			 (int) dot11RSNAConfigPairwiseUpdateCount) {
2164 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2165 			wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2166 					 "PTKSTART: Retry limit %d reached",
2167 					 dot11RSNAConfigPairwiseUpdateCount);
2168 			SM_ENTER(WPA_PTK, DISCONNECT);
2169 		} else if (sm->TimeoutEvt)
2170 			SM_ENTER(WPA_PTK, PTKSTART);
2171 		break;
2172 	case WPA_PTK_PTKCALCNEGOTIATING:
2173 		if (sm->MICVerified)
2174 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2175 		else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2176 			 sm->EAPOLKeyPairwise)
2177 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2178 		else if (sm->TimeoutEvt)
2179 			SM_ENTER(WPA_PTK, PTKSTART);
2180 		break;
2181 	case WPA_PTK_PTKCALCNEGOTIATING2:
2182 		SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2183 		break;
2184 	case WPA_PTK_PTKINITNEGOTIATING:
2185 		if (sm->update_snonce)
2186 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2187 		else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2188 			 sm->EAPOLKeyPairwise && sm->MICVerified)
2189 			SM_ENTER(WPA_PTK, PTKINITDONE);
2190 		else if (sm->TimeoutCtr >
2191 			 (int) dot11RSNAConfigPairwiseUpdateCount) {
2192 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2193 			wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2194 					 "PTKINITNEGOTIATING: Retry limit %d "
2195 					 "reached",
2196 					 dot11RSNAConfigPairwiseUpdateCount);
2197 			SM_ENTER(WPA_PTK, DISCONNECT);
2198 		} else if (sm->TimeoutEvt)
2199 			SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2200 		break;
2201 	case WPA_PTK_PTKINITDONE:
2202 		break;
2203 	}
2204 }
2205 
2206 
2207 SM_STATE(WPA_PTK_GROUP, IDLE)
2208 {
2209 	SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2210 	if (sm->Init) {
2211 		/* Init flag is not cleared here, so avoid busy
2212 		 * loop by claiming nothing changed. */
2213 		sm->changed = FALSE;
2214 	}
2215 	sm->GTimeoutCtr = 0;
2216 }
2217 
2218 
2219 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2220 {
2221 	u8 rsc[WPA_KEY_RSC_LEN];
2222 	struct wpa_group *gsm = sm->group;
2223 	u8 *kde, *pos, hdr[2];
2224 	size_t kde_len;
2225 	u8 *gtk, dummy_gtk[32];
2226 
2227 	SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2228 
2229 	sm->GTimeoutCtr++;
2230 	if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2231 		/* No point in sending the EAPOL-Key - we will disconnect
2232 		 * immediately following this. */
2233 		return;
2234 	}
2235 
2236 	if (sm->wpa == WPA_VERSION_WPA)
2237 		sm->PInitAKeys = FALSE;
2238 	sm->TimeoutEvt = FALSE;
2239 	/* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2240 	os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2241 	if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2242 		wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2243 	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2244 			"sending 1/2 msg of Group Key Handshake");
2245 
2246 	gtk = gsm->GTK[gsm->GN - 1];
2247 	if (sm->wpa_auth->conf.disable_gtk) {
2248 		/*
2249 		 * Provide unique random GTK to each STA to prevent use
2250 		 * of GTK in the BSS.
2251 		 */
2252 		if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2253 			return;
2254 		gtk = dummy_gtk;
2255 	}
2256 	if (sm->wpa == WPA_VERSION_WPA2) {
2257 		kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2258 			ieee80211w_kde_len(sm);
2259 		kde = os_malloc(kde_len);
2260 		if (kde == NULL)
2261 			return;
2262 
2263 		pos = kde;
2264 		hdr[0] = gsm->GN & 0x03;
2265 		hdr[1] = 0;
2266 		pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2267 				  gtk, gsm->GTK_len);
2268 		pos = ieee80211w_kde_add(sm, pos);
2269 	} else {
2270 		kde = gtk;
2271 		pos = kde + gsm->GTK_len;
2272 	}
2273 
2274 	wpa_send_eapol(sm->wpa_auth, sm,
2275 		       WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2276 		       WPA_KEY_INFO_ACK |
2277 		       (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2278 		       rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2279 	if (sm->wpa == WPA_VERSION_WPA2)
2280 		os_free(kde);
2281 }
2282 
2283 
2284 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2285 {
2286 	SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2287 	sm->EAPOLKeyReceived = FALSE;
2288 	if (sm->GUpdateStationKeys)
2289 		sm->group->GKeyDoneStations--;
2290 	sm->GUpdateStationKeys = FALSE;
2291 	sm->GTimeoutCtr = 0;
2292 	/* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2293 	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2294 			 "group key handshake completed (%s)",
2295 			 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2296 	sm->has_GTK = TRUE;
2297 }
2298 
2299 
2300 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2301 {
2302 	SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2303 	if (sm->GUpdateStationKeys)
2304 		sm->group->GKeyDoneStations--;
2305 	sm->GUpdateStationKeys = FALSE;
2306 	sm->Disconnect = TRUE;
2307 }
2308 
2309 
2310 SM_STEP(WPA_PTK_GROUP)
2311 {
2312 	if (sm->Init || sm->PtkGroupInit) {
2313 		SM_ENTER(WPA_PTK_GROUP, IDLE);
2314 		sm->PtkGroupInit = FALSE;
2315 	} else switch (sm->wpa_ptk_group_state) {
2316 	case WPA_PTK_GROUP_IDLE:
2317 		if (sm->GUpdateStationKeys ||
2318 		    (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2319 			SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2320 		break;
2321 	case WPA_PTK_GROUP_REKEYNEGOTIATING:
2322 		if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2323 		    !sm->EAPOLKeyPairwise && sm->MICVerified)
2324 			SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2325 		else if (sm->GTimeoutCtr >
2326 			 (int) dot11RSNAConfigGroupUpdateCount)
2327 			SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2328 		else if (sm->TimeoutEvt)
2329 			SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2330 		break;
2331 	case WPA_PTK_GROUP_KEYERROR:
2332 		SM_ENTER(WPA_PTK_GROUP, IDLE);
2333 		break;
2334 	case WPA_PTK_GROUP_REKEYESTABLISHED:
2335 		SM_ENTER(WPA_PTK_GROUP, IDLE);
2336 		break;
2337 	}
2338 }
2339 
2340 
2341 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2342 			  struct wpa_group *group)
2343 {
2344 	int ret = 0;
2345 
2346 	os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2347 	inc_byte_array(group->Counter, WPA_NONCE_LEN);
2348 	if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2349 			   wpa_auth->addr, group->GNonce,
2350 			   group->GTK[group->GN - 1], group->GTK_len) < 0)
2351 		ret = -1;
2352 	wpa_hexdump_key(MSG_DEBUG, "GTK",
2353 			group->GTK[group->GN - 1], group->GTK_len);
2354 
2355 #ifdef CONFIG_IEEE80211W
2356 	if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2357 		os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2358 		inc_byte_array(group->Counter, WPA_NONCE_LEN);
2359 		if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2360 				   wpa_auth->addr, group->GNonce,
2361 				   group->IGTK[group->GN_igtk - 4],
2362 				   WPA_IGTK_LEN) < 0)
2363 			ret = -1;
2364 		wpa_hexdump_key(MSG_DEBUG, "IGTK",
2365 				group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2366 	}
2367 #endif /* CONFIG_IEEE80211W */
2368 
2369 	return ret;
2370 }
2371 
2372 
2373 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2374 			       struct wpa_group *group)
2375 {
2376 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2377 		   "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2378 	group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2379 	group->wpa_group_state = WPA_GROUP_GTK_INIT;
2380 
2381 	/* GTK[0..N] = 0 */
2382 	os_memset(group->GTK, 0, sizeof(group->GTK));
2383 	group->GN = 1;
2384 	group->GM = 2;
2385 #ifdef CONFIG_IEEE80211W
2386 	group->GN_igtk = 4;
2387 	group->GM_igtk = 5;
2388 #endif /* CONFIG_IEEE80211W */
2389 	/* GTK[GN] = CalcGTK() */
2390 	wpa_gtk_update(wpa_auth, group);
2391 }
2392 
2393 
2394 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2395 {
2396 	if (ctx != NULL && ctx != sm->group)
2397 		return 0;
2398 
2399 	if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2400 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2401 				"Not in PTKINITDONE; skip Group Key update");
2402 		sm->GUpdateStationKeys = FALSE;
2403 		return 0;
2404 	}
2405 	if (sm->GUpdateStationKeys) {
2406 		/*
2407 		 * This should not really happen, so add a debug log entry.
2408 		 * Since we clear the GKeyDoneStations before the loop, the
2409 		 * station needs to be counted here anyway.
2410 		 */
2411 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2412 				"GUpdateStationKeys was already set when "
2413 				"marking station for GTK rekeying");
2414 	}
2415 
2416 	/* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2417 	if (sm->is_wnmsleep)
2418 		return 0;
2419 
2420 	sm->group->GKeyDoneStations++;
2421 	sm->GUpdateStationKeys = TRUE;
2422 
2423 	wpa_sm_step(sm);
2424 	return 0;
2425 }
2426 
2427 
2428 #ifdef CONFIG_WNM
2429 /* update GTK when exiting WNM-Sleep Mode */
2430 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2431 {
2432 	if (sm->is_wnmsleep)
2433 		return;
2434 
2435 	wpa_group_update_sta(sm, NULL);
2436 }
2437 
2438 
2439 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2440 {
2441 	sm->is_wnmsleep = !!flag;
2442 }
2443 
2444 
2445 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2446 {
2447 	struct wpa_group *gsm = sm->group;
2448 	u8 *start = pos;
2449 
2450 	/*
2451 	 * GTK subelement:
2452 	 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2453 	 * Key[5..32]
2454 	 */
2455 	*pos++ = WNM_SLEEP_SUBELEM_GTK;
2456 	*pos++ = 11 + gsm->GTK_len;
2457 	/* Key ID in B0-B1 of Key Info */
2458 	WPA_PUT_LE16(pos, gsm->GN & 0x03);
2459 	pos += 2;
2460 	*pos++ = gsm->GTK_len;
2461 	if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2462 		return 0;
2463 	pos += 8;
2464 	os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2465 	pos += gsm->GTK_len;
2466 
2467 	wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2468 		   gsm->GN);
2469 	wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2470 			gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2471 
2472 	return pos - start;
2473 }
2474 
2475 
2476 #ifdef CONFIG_IEEE80211W
2477 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2478 {
2479 	struct wpa_group *gsm = sm->group;
2480 	u8 *start = pos;
2481 
2482 	/*
2483 	 * IGTK subelement:
2484 	 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2485 	 */
2486 	*pos++ = WNM_SLEEP_SUBELEM_IGTK;
2487 	*pos++ = 2 + 6 + WPA_IGTK_LEN;
2488 	WPA_PUT_LE16(pos, gsm->GN_igtk);
2489 	pos += 2;
2490 	if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2491 		return 0;
2492 	pos += 6;
2493 
2494 	os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2495 	pos += WPA_IGTK_LEN;
2496 
2497 	wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2498 		   gsm->GN_igtk);
2499 	wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2500 			gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2501 
2502 	return pos - start;
2503 }
2504 #endif /* CONFIG_IEEE80211W */
2505 #endif /* CONFIG_WNM */
2506 
2507 
2508 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2509 			      struct wpa_group *group)
2510 {
2511 	int tmp;
2512 
2513 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2514 		   "SETKEYS (VLAN-ID %d)", group->vlan_id);
2515 	group->changed = TRUE;
2516 	group->wpa_group_state = WPA_GROUP_SETKEYS;
2517 	group->GTKReKey = FALSE;
2518 	tmp = group->GM;
2519 	group->GM = group->GN;
2520 	group->GN = tmp;
2521 #ifdef CONFIG_IEEE80211W
2522 	tmp = group->GM_igtk;
2523 	group->GM_igtk = group->GN_igtk;
2524 	group->GN_igtk = tmp;
2525 #endif /* CONFIG_IEEE80211W */
2526 	/* "GKeyDoneStations = GNoStations" is done in more robust way by
2527 	 * counting the STAs that are marked with GUpdateStationKeys instead of
2528 	 * including all STAs that could be in not-yet-completed state. */
2529 	wpa_gtk_update(wpa_auth, group);
2530 
2531 	if (group->GKeyDoneStations) {
2532 		wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2533 			   "GKeyDoneStations=%d when starting new GTK rekey",
2534 			   group->GKeyDoneStations);
2535 		group->GKeyDoneStations = 0;
2536 	}
2537 	wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2538 	wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2539 		   group->GKeyDoneStations);
2540 }
2541 
2542 
2543 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2544 				       struct wpa_group *group)
2545 {
2546 	int ret = 0;
2547 
2548 	if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2549 			     wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2550 			     broadcast_ether_addr, group->GN,
2551 			     group->GTK[group->GN - 1], group->GTK_len) < 0)
2552 		ret = -1;
2553 
2554 #ifdef CONFIG_IEEE80211W
2555 	if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2556 	    wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2557 			     broadcast_ether_addr, group->GN_igtk,
2558 			     group->IGTK[group->GN_igtk - 4],
2559 			     WPA_IGTK_LEN) < 0)
2560 		ret = -1;
2561 #endif /* CONFIG_IEEE80211W */
2562 
2563 	return ret;
2564 }
2565 
2566 
2567 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2568 				 struct wpa_group *group)
2569 {
2570 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2571 		   "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2572 	group->changed = TRUE;
2573 	group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2574 
2575 	if (wpa_group_config_group_keys(wpa_auth, group) < 0)
2576 		return -1;
2577 
2578 	return 0;
2579 }
2580 
2581 
2582 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2583 			      struct wpa_group *group)
2584 {
2585 	if (group->GInit) {
2586 		wpa_group_gtk_init(wpa_auth, group);
2587 	} else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2588 		   group->GTKAuthenticator) {
2589 		wpa_group_setkeysdone(wpa_auth, group);
2590 	} else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2591 		   group->GTKReKey) {
2592 		wpa_group_setkeys(wpa_auth, group);
2593 	} else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2594 		if (group->GKeyDoneStations == 0)
2595 			wpa_group_setkeysdone(wpa_auth, group);
2596 		else if (group->GTKReKey)
2597 			wpa_group_setkeys(wpa_auth, group);
2598 	}
2599 }
2600 
2601 
2602 static int wpa_sm_step(struct wpa_state_machine *sm)
2603 {
2604 	if (sm == NULL)
2605 		return 0;
2606 
2607 	if (sm->in_step_loop) {
2608 		/* This should not happen, but if it does, make sure we do not
2609 		 * end up freeing the state machine too early by exiting the
2610 		 * recursive call. */
2611 		wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2612 		return 0;
2613 	}
2614 
2615 	sm->in_step_loop = 1;
2616 	do {
2617 		if (sm->pending_deinit)
2618 			break;
2619 
2620 		sm->changed = FALSE;
2621 		sm->wpa_auth->group->changed = FALSE;
2622 
2623 		SM_STEP_RUN(WPA_PTK);
2624 		if (sm->pending_deinit)
2625 			break;
2626 		SM_STEP_RUN(WPA_PTK_GROUP);
2627 		if (sm->pending_deinit)
2628 			break;
2629 		wpa_group_sm_step(sm->wpa_auth, sm->group);
2630 	} while (sm->changed || sm->wpa_auth->group->changed);
2631 	sm->in_step_loop = 0;
2632 
2633 	if (sm->pending_deinit) {
2634 		wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2635 			   "machine deinit for " MACSTR, MAC2STR(sm->addr));
2636 		wpa_free_sta_sm(sm);
2637 		return 1;
2638 	}
2639 	return 0;
2640 }
2641 
2642 
2643 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2644 {
2645 	struct wpa_state_machine *sm = eloop_ctx;
2646 	wpa_sm_step(sm);
2647 }
2648 
2649 
2650 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2651 {
2652 	if (sm == NULL)
2653 		return;
2654 	eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2655 }
2656 
2657 
2658 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2659 {
2660 	int tmp, i;
2661 	struct wpa_group *group;
2662 
2663 	if (wpa_auth == NULL)
2664 		return;
2665 
2666 	group = wpa_auth->group;
2667 
2668 	for (i = 0; i < 2; i++) {
2669 		tmp = group->GM;
2670 		group->GM = group->GN;
2671 		group->GN = tmp;
2672 #ifdef CONFIG_IEEE80211W
2673 		tmp = group->GM_igtk;
2674 		group->GM_igtk = group->GN_igtk;
2675 		group->GN_igtk = tmp;
2676 #endif /* CONFIG_IEEE80211W */
2677 		wpa_gtk_update(wpa_auth, group);
2678 		wpa_group_config_group_keys(wpa_auth, group);
2679 	}
2680 }
2681 
2682 
2683 static const char * wpa_bool_txt(int bool)
2684 {
2685 	return bool ? "TRUE" : "FALSE";
2686 }
2687 
2688 
2689 #define RSN_SUITE "%02x-%02x-%02x-%d"
2690 #define RSN_SUITE_ARG(s) \
2691 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2692 
2693 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2694 {
2695 	int len = 0, ret;
2696 	char pmkid_txt[PMKID_LEN * 2 + 1];
2697 #ifdef CONFIG_RSN_PREAUTH
2698 	const int preauth = 1;
2699 #else /* CONFIG_RSN_PREAUTH */
2700 	const int preauth = 0;
2701 #endif /* CONFIG_RSN_PREAUTH */
2702 
2703 	if (wpa_auth == NULL)
2704 		return len;
2705 
2706 	ret = os_snprintf(buf + len, buflen - len,
2707 			  "dot11RSNAOptionImplemented=TRUE\n"
2708 			  "dot11RSNAPreauthenticationImplemented=%s\n"
2709 			  "dot11RSNAEnabled=%s\n"
2710 			  "dot11RSNAPreauthenticationEnabled=%s\n",
2711 			  wpa_bool_txt(preauth),
2712 			  wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2713 			  wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2714 	if (ret < 0 || (size_t) ret >= buflen - len)
2715 		return len;
2716 	len += ret;
2717 
2718 	wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2719 			 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2720 
2721 	ret = os_snprintf(
2722 		buf + len, buflen - len,
2723 		"dot11RSNAConfigVersion=%u\n"
2724 		"dot11RSNAConfigPairwiseKeysSupported=9999\n"
2725 		/* FIX: dot11RSNAConfigGroupCipher */
2726 		/* FIX: dot11RSNAConfigGroupRekeyMethod */
2727 		/* FIX: dot11RSNAConfigGroupRekeyTime */
2728 		/* FIX: dot11RSNAConfigGroupRekeyPackets */
2729 		"dot11RSNAConfigGroupRekeyStrict=%u\n"
2730 		"dot11RSNAConfigGroupUpdateCount=%u\n"
2731 		"dot11RSNAConfigPairwiseUpdateCount=%u\n"
2732 		"dot11RSNAConfigGroupCipherSize=%u\n"
2733 		"dot11RSNAConfigPMKLifetime=%u\n"
2734 		"dot11RSNAConfigPMKReauthThreshold=%u\n"
2735 		"dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2736 		"dot11RSNAConfigSATimeout=%u\n"
2737 		"dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2738 		"dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2739 		"dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2740 		"dot11RSNAPMKIDUsed=%s\n"
2741 		"dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2742 		"dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2743 		"dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2744 		"dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2745 		"dot11RSNA4WayHandshakeFailures=%u\n"
2746 		"dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2747 		RSN_VERSION,
2748 		!!wpa_auth->conf.wpa_strict_rekey,
2749 		dot11RSNAConfigGroupUpdateCount,
2750 		dot11RSNAConfigPairwiseUpdateCount,
2751 		wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2752 		dot11RSNAConfigPMKLifetime,
2753 		dot11RSNAConfigPMKReauthThreshold,
2754 		dot11RSNAConfigSATimeout,
2755 		RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2756 		RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2757 		RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2758 		pmkid_txt,
2759 		RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2760 		RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2761 		RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2762 		wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2763 		wpa_auth->dot11RSNA4WayHandshakeFailures);
2764 	if (ret < 0 || (size_t) ret >= buflen - len)
2765 		return len;
2766 	len += ret;
2767 
2768 	/* TODO: dot11RSNAConfigPairwiseCiphersTable */
2769 	/* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2770 
2771 	/* Private MIB */
2772 	ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2773 			  wpa_auth->group->wpa_group_state);
2774 	if (ret < 0 || (size_t) ret >= buflen - len)
2775 		return len;
2776 	len += ret;
2777 
2778 	return len;
2779 }
2780 
2781 
2782 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2783 {
2784 	int len = 0, ret;
2785 	u32 pairwise = 0;
2786 
2787 	if (sm == NULL)
2788 		return 0;
2789 
2790 	/* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2791 
2792 	/* dot11RSNAStatsEntry */
2793 
2794 	pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2795 				       WPA_PROTO_RSN : WPA_PROTO_WPA,
2796 				       sm->pairwise);
2797 	if (pairwise == 0)
2798 		return 0;
2799 
2800 	ret = os_snprintf(
2801 		buf + len, buflen - len,
2802 		/* TODO: dot11RSNAStatsIndex */
2803 		"dot11RSNAStatsSTAAddress=" MACSTR "\n"
2804 		"dot11RSNAStatsVersion=1\n"
2805 		"dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2806 		/* TODO: dot11RSNAStatsTKIPICVErrors */
2807 		"dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2808 		"dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2809 		/* TODO: dot11RSNAStatsCCMPReplays */
2810 		/* TODO: dot11RSNAStatsCCMPDecryptErrors */
2811 		/* TODO: dot11RSNAStatsTKIPReplays */,
2812 		MAC2STR(sm->addr),
2813 		RSN_SUITE_ARG(pairwise),
2814 		sm->dot11RSNAStatsTKIPLocalMICFailures,
2815 		sm->dot11RSNAStatsTKIPRemoteMICFailures);
2816 	if (ret < 0 || (size_t) ret >= buflen - len)
2817 		return len;
2818 	len += ret;
2819 
2820 	/* Private MIB */
2821 	ret = os_snprintf(buf + len, buflen - len,
2822 			  "hostapdWPAPTKState=%d\n"
2823 			  "hostapdWPAPTKGroupState=%d\n",
2824 			  sm->wpa_ptk_state,
2825 			  sm->wpa_ptk_group_state);
2826 	if (ret < 0 || (size_t) ret >= buflen - len)
2827 		return len;
2828 	len += ret;
2829 
2830 	return len;
2831 }
2832 
2833 
2834 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2835 {
2836 	if (wpa_auth)
2837 		wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2838 }
2839 
2840 
2841 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2842 {
2843 	return sm && sm->pairwise_set;
2844 }
2845 
2846 
2847 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2848 {
2849 	return sm->pairwise;
2850 }
2851 
2852 
2853 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2854 {
2855 	if (sm == NULL)
2856 		return -1;
2857 	return sm->wpa_key_mgmt;
2858 }
2859 
2860 
2861 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2862 {
2863 	if (sm == NULL)
2864 		return 0;
2865 	return sm->wpa;
2866 }
2867 
2868 
2869 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2870 			     struct rsn_pmksa_cache_entry *entry)
2871 {
2872 	if (sm == NULL || sm->pmksa != entry)
2873 		return -1;
2874 	sm->pmksa = NULL;
2875 	return 0;
2876 }
2877 
2878 
2879 struct rsn_pmksa_cache_entry *
2880 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
2881 {
2882 	return sm ? sm->pmksa : NULL;
2883 }
2884 
2885 
2886 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
2887 {
2888 	if (sm)
2889 		sm->dot11RSNAStatsTKIPLocalMICFailures++;
2890 }
2891 
2892 
2893 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
2894 {
2895 	if (wpa_auth == NULL)
2896 		return NULL;
2897 	*len = wpa_auth->wpa_ie_len;
2898 	return wpa_auth->wpa_ie;
2899 }
2900 
2901 
2902 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
2903 		       int session_timeout, struct eapol_state_machine *eapol)
2904 {
2905 	if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
2906 	    sm->wpa_auth->conf.disable_pmksa_caching)
2907 		return -1;
2908 
2909 	if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
2910 				 sm->wpa_auth->addr, sm->addr, session_timeout,
2911 				 eapol, sm->wpa_key_mgmt))
2912 		return 0;
2913 
2914 	return -1;
2915 }
2916 
2917 
2918 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
2919 			       const u8 *pmk, size_t len, const u8 *sta_addr,
2920 			       int session_timeout,
2921 			       struct eapol_state_machine *eapol)
2922 {
2923 	if (wpa_auth == NULL)
2924 		return -1;
2925 
2926 	if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
2927 				 sta_addr, session_timeout, eapol,
2928 				 WPA_KEY_MGMT_IEEE8021X))
2929 		return 0;
2930 
2931 	return -1;
2932 }
2933 
2934 
2935 static struct wpa_group *
2936 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
2937 {
2938 	struct wpa_group *group;
2939 
2940 	if (wpa_auth == NULL || wpa_auth->group == NULL)
2941 		return NULL;
2942 
2943 	wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
2944 		   vlan_id);
2945 	group = wpa_group_init(wpa_auth, vlan_id, 0);
2946 	if (group == NULL)
2947 		return NULL;
2948 
2949 	group->next = wpa_auth->group->next;
2950 	wpa_auth->group->next = group;
2951 
2952 	return group;
2953 }
2954 
2955 
2956 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
2957 {
2958 	struct wpa_group *group;
2959 
2960 	if (sm == NULL || sm->wpa_auth == NULL)
2961 		return 0;
2962 
2963 	group = sm->wpa_auth->group;
2964 	while (group) {
2965 		if (group->vlan_id == vlan_id)
2966 			break;
2967 		group = group->next;
2968 	}
2969 
2970 	if (group == NULL) {
2971 		group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
2972 		if (group == NULL)
2973 			return -1;
2974 	}
2975 
2976 	if (sm->group == group)
2977 		return 0;
2978 
2979 	wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
2980 		   "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
2981 
2982 	sm->group = group;
2983 	return 0;
2984 }
2985 
2986 
2987 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
2988 				  struct wpa_state_machine *sm, int ack)
2989 {
2990 	if (wpa_auth == NULL || sm == NULL)
2991 		return;
2992 	wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
2993 		   " ack=%d", MAC2STR(sm->addr), ack);
2994 	if (sm->pending_1_of_4_timeout && ack) {
2995 		/*
2996 		 * Some deployed supplicant implementations update their SNonce
2997 		 * for each EAPOL-Key 2/4 message even within the same 4-way
2998 		 * handshake and then fail to use the first SNonce when
2999 		 * deriving the PTK. This results in unsuccessful 4-way
3000 		 * handshake whenever the relatively short initial timeout is
3001 		 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3002 		 * around this by increasing the timeout now that we know that
3003 		 * the station has received the frame.
3004 		 */
3005 		int timeout_ms = eapol_key_timeout_subseq;
3006 		wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3007 			   "timeout by %u ms because of acknowledged frame",
3008 			   timeout_ms);
3009 		eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3010 		eloop_register_timeout(timeout_ms / 1000,
3011 				       (timeout_ms % 1000) * 1000,
3012 				       wpa_send_eapol_timeout, wpa_auth, sm);
3013 	}
3014 }
3015 
3016 
3017 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3018 {
3019 	if (sm == NULL)
3020 		return 0;
3021 	return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3022 }
3023