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1 /*
2  * IEEE 802.11 RSN / WPA Authenticator
3  * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8 
9 #include "utils/includes.h"
10 
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/state_machine.h"
14 #include "utils/bitfield.h"
15 #include "common/ieee802_11_defs.h"
16 #include "crypto/aes_wrap.h"
17 #include "crypto/crypto.h"
18 #include "crypto/sha1.h"
19 #include "crypto/sha256.h"
20 #include "crypto/random.h"
21 #include "eapol_auth/eapol_auth_sm.h"
22 #include "ap_config.h"
23 #include "ieee802_11.h"
24 #include "wpa_auth.h"
25 #include "pmksa_cache_auth.h"
26 #include "wpa_auth_i.h"
27 #include "wpa_auth_ie.h"
28 
29 #define STATE_MACHINE_DATA struct wpa_state_machine
30 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
31 #define STATE_MACHINE_ADDR sm->addr
32 
33 
34 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
35 static int wpa_sm_step(struct wpa_state_machine *sm);
36 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
37 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
38 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
39 			      struct wpa_group *group);
40 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
41 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
42 			  struct wpa_group *group);
43 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
44 				       struct wpa_group *group);
45 
46 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
47 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
48 static const u32 eapol_key_timeout_first = 100; /* ms */
49 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
50 static const u32 eapol_key_timeout_first_group = 500; /* ms */
51 
52 /* TODO: make these configurable */
53 static const int dot11RSNAConfigPMKLifetime = 43200;
54 static const int dot11RSNAConfigPMKReauthThreshold = 70;
55 static const int dot11RSNAConfigSATimeout = 60;
56 
57 
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)58 static inline int wpa_auth_mic_failure_report(
59 	struct wpa_authenticator *wpa_auth, const u8 *addr)
60 {
61 	if (wpa_auth->cb.mic_failure_report)
62 		return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
63 	return 0;
64 }
65 
66 
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)67 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
68 				      const u8 *addr, wpa_eapol_variable var,
69 				      int value)
70 {
71 	if (wpa_auth->cb.set_eapol)
72 		wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
73 }
74 
75 
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)76 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
77 				     const u8 *addr, wpa_eapol_variable var)
78 {
79 	if (wpa_auth->cb.get_eapol == NULL)
80 		return -1;
81 	return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
82 }
83 
84 
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)85 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
86 					  const u8 *addr,
87 					  const u8 *p2p_dev_addr,
88 					  const u8 *prev_psk)
89 {
90 	if (wpa_auth->cb.get_psk == NULL)
91 		return NULL;
92 	return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
93 				    prev_psk);
94 }
95 
96 
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)97 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
98 				   const u8 *addr, u8 *msk, size_t *len)
99 {
100 	if (wpa_auth->cb.get_msk == NULL)
101 		return -1;
102 	return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
103 }
104 
105 
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)106 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
107 				   int vlan_id,
108 				   enum wpa_alg alg, const u8 *addr, int idx,
109 				   u8 *key, size_t key_len)
110 {
111 	if (wpa_auth->cb.set_key == NULL)
112 		return -1;
113 	return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
114 				    key, key_len);
115 }
116 
117 
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)118 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
119 				      const u8 *addr, int idx, u8 *seq)
120 {
121 	if (wpa_auth->cb.get_seqnum == NULL)
122 		return -1;
123 	return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
124 }
125 
126 
127 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)128 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
129 		    const u8 *data, size_t data_len, int encrypt)
130 {
131 	if (wpa_auth->cb.send_eapol == NULL)
132 		return -1;
133 	return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
134 				       encrypt);
135 }
136 
137 
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)138 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
139 			  int (*cb)(struct wpa_state_machine *sm, void *ctx),
140 			  void *cb_ctx)
141 {
142 	if (wpa_auth->cb.for_each_sta == NULL)
143 		return 0;
144 	return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
145 }
146 
147 
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)148 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
149 			   int (*cb)(struct wpa_authenticator *a, void *ctx),
150 			   void *cb_ctx)
151 {
152 	if (wpa_auth->cb.for_each_auth == NULL)
153 		return 0;
154 	return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
155 }
156 
157 
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)158 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
159 		     logger_level level, const char *txt)
160 {
161 	if (wpa_auth->cb.logger == NULL)
162 		return;
163 	wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
164 }
165 
166 
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)167 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
168 		      logger_level level, const char *fmt, ...)
169 {
170 	char *format;
171 	int maxlen;
172 	va_list ap;
173 
174 	if (wpa_auth->cb.logger == NULL)
175 		return;
176 
177 	maxlen = os_strlen(fmt) + 100;
178 	format = os_malloc(maxlen);
179 	if (!format)
180 		return;
181 
182 	va_start(ap, fmt);
183 	vsnprintf(format, maxlen, fmt, ap);
184 	va_end(ap);
185 
186 	wpa_auth_logger(wpa_auth, addr, level, format);
187 
188 	os_free(format);
189 }
190 
191 
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr)192 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
193 			       const u8 *addr)
194 {
195 	if (wpa_auth->cb.disconnect == NULL)
196 		return;
197 	wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
198 	wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
199 				WLAN_REASON_PREV_AUTH_NOT_VALID);
200 }
201 
202 
wpa_use_aes_cmac(struct wpa_state_machine * sm)203 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
204 {
205 	int ret = 0;
206 #ifdef CONFIG_IEEE80211R
207 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
208 		ret = 1;
209 #endif /* CONFIG_IEEE80211R */
210 #ifdef CONFIG_IEEE80211W
211 	if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
212 		ret = 1;
213 #endif /* CONFIG_IEEE80211W */
214 	if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
215 		ret = 1;
216 	return ret;
217 }
218 
219 
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)220 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
221 {
222 	struct wpa_authenticator *wpa_auth = eloop_ctx;
223 
224 	if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
225 		wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
226 			   "initialization.");
227 	} else {
228 		wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
229 		wpa_hexdump_key(MSG_DEBUG, "GMK",
230 				wpa_auth->group->GMK, WPA_GMK_LEN);
231 	}
232 
233 	if (wpa_auth->conf.wpa_gmk_rekey) {
234 		eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
235 				       wpa_rekey_gmk, wpa_auth, NULL);
236 	}
237 }
238 
239 
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)240 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
241 {
242 	struct wpa_authenticator *wpa_auth = eloop_ctx;
243 	struct wpa_group *group;
244 
245 	wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
246 	for (group = wpa_auth->group; group; group = group->next) {
247 		group->GTKReKey = TRUE;
248 		do {
249 			group->changed = FALSE;
250 			wpa_group_sm_step(wpa_auth, group);
251 		} while (group->changed);
252 	}
253 
254 	if (wpa_auth->conf.wpa_group_rekey) {
255 		eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
256 				       0, wpa_rekey_gtk, wpa_auth, NULL);
257 	}
258 }
259 
260 
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)261 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
262 {
263 	struct wpa_authenticator *wpa_auth = eloop_ctx;
264 	struct wpa_state_machine *sm = timeout_ctx;
265 
266 	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
267 	wpa_request_new_ptk(sm);
268 	wpa_sm_step(sm);
269 }
270 
271 
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)272 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
273 {
274 	if (sm->pmksa == ctx)
275 		sm->pmksa = NULL;
276 	return 0;
277 }
278 
279 
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)280 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
281 				   void *ctx)
282 {
283 	struct wpa_authenticator *wpa_auth = ctx;
284 	wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
285 }
286 
287 
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)288 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
289 					  struct wpa_group *group)
290 {
291 	u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
292 	u8 rkey[32];
293 	unsigned long ptr;
294 
295 	if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
296 		return -1;
297 	wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
298 
299 	/*
300 	 * Counter = PRF-256(Random number, "Init Counter",
301 	 *                   Local MAC Address || Time)
302 	 */
303 	os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
304 	wpa_get_ntp_timestamp(buf + ETH_ALEN);
305 	ptr = (unsigned long) group;
306 	os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
307 	if (random_get_bytes(rkey, sizeof(rkey)) < 0)
308 		return -1;
309 
310 	if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
311 		     group->Counter, WPA_NONCE_LEN) < 0)
312 		return -1;
313 	wpa_hexdump_key(MSG_DEBUG, "Key Counter",
314 			group->Counter, WPA_NONCE_LEN);
315 
316 	return 0;
317 }
318 
319 
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)320 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
321 					 int vlan_id, int delay_init)
322 {
323 	struct wpa_group *group;
324 
325 	group = os_zalloc(sizeof(struct wpa_group));
326 	if (group == NULL)
327 		return NULL;
328 
329 	group->GTKAuthenticator = TRUE;
330 	group->vlan_id = vlan_id;
331 	group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
332 
333 	if (random_pool_ready() != 1) {
334 		wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
335 			   "for secure operations - update keys later when "
336 			   "the first station connects");
337 	}
338 
339 	/*
340 	 * Set initial GMK/Counter value here. The actual values that will be
341 	 * used in negotiations will be set once the first station tries to
342 	 * connect. This allows more time for collecting additional randomness
343 	 * on embedded devices.
344 	 */
345 	if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
346 		wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
347 			   "initialization.");
348 		os_free(group);
349 		return NULL;
350 	}
351 
352 	group->GInit = TRUE;
353 	if (delay_init) {
354 		wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
355 			   "until Beacon frames have been configured");
356 		/* Initialization is completed in wpa_init_keys(). */
357 	} else {
358 		wpa_group_sm_step(wpa_auth, group);
359 		group->GInit = FALSE;
360 		wpa_group_sm_step(wpa_auth, group);
361 	}
362 
363 	return group;
364 }
365 
366 
367 /**
368  * wpa_init - Initialize WPA authenticator
369  * @addr: Authenticator address
370  * @conf: Configuration for WPA authenticator
371  * @cb: Callback functions for WPA authenticator
372  * Returns: Pointer to WPA authenticator data or %NULL on failure
373  */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,struct wpa_auth_callbacks * cb)374 struct wpa_authenticator * wpa_init(const u8 *addr,
375 				    struct wpa_auth_config *conf,
376 				    struct wpa_auth_callbacks *cb)
377 {
378 	struct wpa_authenticator *wpa_auth;
379 
380 	wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
381 	if (wpa_auth == NULL)
382 		return NULL;
383 	os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
384 	os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
385 	os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
386 
387 	if (wpa_auth_gen_wpa_ie(wpa_auth)) {
388 		wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
389 		os_free(wpa_auth);
390 		return NULL;
391 	}
392 
393 	wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
394 	if (wpa_auth->group == NULL) {
395 		os_free(wpa_auth->wpa_ie);
396 		os_free(wpa_auth);
397 		return NULL;
398 	}
399 
400 	wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
401 						wpa_auth);
402 	if (wpa_auth->pmksa == NULL) {
403 		wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
404 		os_free(wpa_auth->wpa_ie);
405 		os_free(wpa_auth);
406 		return NULL;
407 	}
408 
409 #ifdef CONFIG_IEEE80211R
410 	wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
411 	if (wpa_auth->ft_pmk_cache == NULL) {
412 		wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
413 		os_free(wpa_auth->wpa_ie);
414 		pmksa_cache_auth_deinit(wpa_auth->pmksa);
415 		os_free(wpa_auth);
416 		return NULL;
417 	}
418 #endif /* CONFIG_IEEE80211R */
419 
420 	if (wpa_auth->conf.wpa_gmk_rekey) {
421 		eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
422 				       wpa_rekey_gmk, wpa_auth, NULL);
423 	}
424 
425 	if (wpa_auth->conf.wpa_group_rekey) {
426 		eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
427 				       wpa_rekey_gtk, wpa_auth, NULL);
428 	}
429 
430 #ifdef CONFIG_P2P
431 	if (WPA_GET_BE32(conf->ip_addr_start)) {
432 		int count = WPA_GET_BE32(conf->ip_addr_end) -
433 			WPA_GET_BE32(conf->ip_addr_start) + 1;
434 		if (count > 1000)
435 			count = 1000;
436 		if (count > 0)
437 			wpa_auth->ip_pool = bitfield_alloc(count);
438 	}
439 #endif /* CONFIG_P2P */
440 
441 	return wpa_auth;
442 }
443 
444 
wpa_init_keys(struct wpa_authenticator * wpa_auth)445 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
446 {
447 	struct wpa_group *group = wpa_auth->group;
448 
449 	wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
450 		   "keys");
451 	wpa_group_sm_step(wpa_auth, group);
452 	group->GInit = FALSE;
453 	wpa_group_sm_step(wpa_auth, group);
454 	if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
455 		return -1;
456 	return 0;
457 }
458 
459 
460 /**
461  * wpa_deinit - Deinitialize WPA authenticator
462  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
463  */
wpa_deinit(struct wpa_authenticator * wpa_auth)464 void wpa_deinit(struct wpa_authenticator *wpa_auth)
465 {
466 	struct wpa_group *group, *prev;
467 
468 	eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
469 	eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
470 
471 #ifdef CONFIG_PEERKEY
472 	while (wpa_auth->stsl_negotiations)
473 		wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
474 #endif /* CONFIG_PEERKEY */
475 
476 	pmksa_cache_auth_deinit(wpa_auth->pmksa);
477 
478 #ifdef CONFIG_IEEE80211R
479 	wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
480 	wpa_auth->ft_pmk_cache = NULL;
481 #endif /* CONFIG_IEEE80211R */
482 
483 #ifdef CONFIG_P2P
484 	bitfield_free(wpa_auth->ip_pool);
485 #endif /* CONFIG_P2P */
486 
487 
488 	os_free(wpa_auth->wpa_ie);
489 
490 	group = wpa_auth->group;
491 	while (group) {
492 		prev = group;
493 		group = group->next;
494 		os_free(prev);
495 	}
496 
497 	os_free(wpa_auth);
498 }
499 
500 
501 /**
502  * wpa_reconfig - Update WPA authenticator configuration
503  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
504  * @conf: Configuration for WPA authenticator
505  */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)506 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
507 		 struct wpa_auth_config *conf)
508 {
509 	struct wpa_group *group;
510 	if (wpa_auth == NULL)
511 		return 0;
512 
513 	os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
514 	if (wpa_auth_gen_wpa_ie(wpa_auth)) {
515 		wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
516 		return -1;
517 	}
518 
519 	/*
520 	 * Reinitialize GTK to make sure it is suitable for the new
521 	 * configuration.
522 	 */
523 	group = wpa_auth->group;
524 	group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
525 	group->GInit = TRUE;
526 	wpa_group_sm_step(wpa_auth, group);
527 	group->GInit = FALSE;
528 	wpa_group_sm_step(wpa_auth, group);
529 
530 	return 0;
531 }
532 
533 
534 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr)535 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
536 		  const u8 *p2p_dev_addr)
537 {
538 	struct wpa_state_machine *sm;
539 
540 	if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
541 		return NULL;
542 
543 	sm = os_zalloc(sizeof(struct wpa_state_machine));
544 	if (sm == NULL)
545 		return NULL;
546 	os_memcpy(sm->addr, addr, ETH_ALEN);
547 	if (p2p_dev_addr)
548 		os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
549 
550 	sm->wpa_auth = wpa_auth;
551 	sm->group = wpa_auth->group;
552 
553 	return sm;
554 }
555 
556 
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)557 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
558 			    struct wpa_state_machine *sm)
559 {
560 	if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
561 		return -1;
562 
563 #ifdef CONFIG_IEEE80211R
564 	if (sm->ft_completed) {
565 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
566 				"FT authentication already completed - do not "
567 				"start 4-way handshake");
568 		/* Go to PTKINITDONE state to allow GTK rekeying */
569 		sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
570 		return 0;
571 	}
572 #endif /* CONFIG_IEEE80211R */
573 
574 	if (sm->started) {
575 		os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
576 		sm->ReAuthenticationRequest = TRUE;
577 		return wpa_sm_step(sm);
578 	}
579 
580 	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
581 			"start authentication");
582 	sm->started = 1;
583 
584 	sm->Init = TRUE;
585 	if (wpa_sm_step(sm) == 1)
586 		return 1; /* should not really happen */
587 	sm->Init = FALSE;
588 	sm->AuthenticationRequest = TRUE;
589 	return wpa_sm_step(sm);
590 }
591 
592 
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)593 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
594 {
595 	/* WPA/RSN was not used - clear WPA state. This is needed if the STA
596 	 * reassociates back to the same AP while the previous entry for the
597 	 * STA has not yet been removed. */
598 	if (sm == NULL)
599 		return;
600 
601 	sm->wpa_key_mgmt = 0;
602 }
603 
604 
wpa_free_sta_sm(struct wpa_state_machine * sm)605 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
606 {
607 #ifdef CONFIG_P2P
608 	if (WPA_GET_BE32(sm->ip_addr)) {
609 		u32 start;
610 		wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
611 			   "address %u.%u.%u.%u from " MACSTR,
612 			   sm->ip_addr[0], sm->ip_addr[1],
613 			   sm->ip_addr[2], sm->ip_addr[3],
614 			   MAC2STR(sm->addr));
615 		start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
616 		bitfield_clear(sm->wpa_auth->ip_pool,
617 			       WPA_GET_BE32(sm->ip_addr) - start);
618 	}
619 #endif /* CONFIG_P2P */
620 	if (sm->GUpdateStationKeys) {
621 		sm->group->GKeyDoneStations--;
622 		sm->GUpdateStationKeys = FALSE;
623 	}
624 #ifdef CONFIG_IEEE80211R
625 	os_free(sm->assoc_resp_ftie);
626 	wpabuf_free(sm->ft_pending_req_ies);
627 #endif /* CONFIG_IEEE80211R */
628 	os_free(sm->last_rx_eapol_key);
629 	os_free(sm->wpa_ie);
630 	os_free(sm);
631 }
632 
633 
wpa_auth_sta_deinit(struct wpa_state_machine * sm)634 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
635 {
636 	if (sm == NULL)
637 		return;
638 
639 	if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
640 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
641 				"strict rekeying - force GTK rekey since STA "
642 				"is leaving");
643 		eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
644 		eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
645 				       NULL);
646 	}
647 
648 	eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
649 	sm->pending_1_of_4_timeout = 0;
650 	eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
651 	eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
652 	if (sm->in_step_loop) {
653 		/* Must not free state machine while wpa_sm_step() is running.
654 		 * Freeing will be completed in the end of wpa_sm_step(). */
655 		wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
656 			   "machine deinit for " MACSTR, MAC2STR(sm->addr));
657 		sm->pending_deinit = 1;
658 	} else
659 		wpa_free_sta_sm(sm);
660 }
661 
662 
wpa_request_new_ptk(struct wpa_state_machine * sm)663 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
664 {
665 	if (sm == NULL)
666 		return;
667 
668 	sm->PTKRequest = TRUE;
669 	sm->PTK_valid = 0;
670 }
671 
672 
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)673 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
674 				    const u8 *replay_counter)
675 {
676 	int i;
677 	for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
678 		if (!ctr[i].valid)
679 			break;
680 		if (os_memcmp(replay_counter, ctr[i].counter,
681 			      WPA_REPLAY_COUNTER_LEN) == 0)
682 			return 1;
683 	}
684 	return 0;
685 }
686 
687 
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)688 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
689 					    const u8 *replay_counter)
690 {
691 	int i;
692 	for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
693 		if (ctr[i].valid &&
694 		    (replay_counter == NULL ||
695 		     os_memcmp(replay_counter, ctr[i].counter,
696 			       WPA_REPLAY_COUNTER_LEN) == 0))
697 			ctr[i].valid = FALSE;
698 	}
699 }
700 
701 
702 #ifdef CONFIG_IEEE80211R
ft_check_msg_2_of_4(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,struct wpa_eapol_ie_parse * kde)703 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
704 			       struct wpa_state_machine *sm,
705 			       struct wpa_eapol_ie_parse *kde)
706 {
707 	struct wpa_ie_data ie;
708 	struct rsn_mdie *mdie;
709 
710 	if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
711 	    ie.num_pmkid != 1 || ie.pmkid == NULL) {
712 		wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
713 			   "FT 4-way handshake message 2/4");
714 		return -1;
715 	}
716 
717 	os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
718 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
719 		    sm->sup_pmk_r1_name, PMKID_LEN);
720 
721 	if (!kde->mdie || !kde->ftie) {
722 		wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
723 			   "message 2/4", kde->mdie ? "FTIE" : "MDIE");
724 		return -1;
725 	}
726 
727 	mdie = (struct rsn_mdie *) (kde->mdie + 2);
728 	if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
729 	    os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
730 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
731 		wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
732 		return -1;
733 	}
734 
735 	if (sm->assoc_resp_ftie &&
736 	    (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
737 	     os_memcmp(kde->ftie, sm->assoc_resp_ftie,
738 		       2 + sm->assoc_resp_ftie[1]) != 0)) {
739 		wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
740 		wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
741 			    kde->ftie, kde->ftie_len);
742 		wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
743 			    sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
744 		return -1;
745 	}
746 
747 	return 0;
748 }
749 #endif /* CONFIG_IEEE80211R */
750 
751 
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)752 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
753 				    struct wpa_state_machine *sm, int group)
754 {
755 	/* Supplicant reported a Michael MIC error */
756 	wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
757 			 "received EAPOL-Key Error Request "
758 			 "(STA detected Michael MIC failure (group=%d))",
759 			 group);
760 
761 	if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
762 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
763 				"ignore Michael MIC failure report since "
764 				"group cipher is not TKIP");
765 	} else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
766 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
767 				"ignore Michael MIC failure report since "
768 				"pairwise cipher is not TKIP");
769 	} else {
770 		if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
771 			return 1; /* STA entry was removed */
772 		sm->dot11RSNAStatsTKIPRemoteMICFailures++;
773 		wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
774 	}
775 
776 	/*
777 	 * Error report is not a request for a new key handshake, but since
778 	 * Authenticator may do it, let's change the keys now anyway.
779 	 */
780 	wpa_request_new_ptk(sm);
781 	return 0;
782 }
783 
784 
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)785 void wpa_receive(struct wpa_authenticator *wpa_auth,
786 		 struct wpa_state_machine *sm,
787 		 u8 *data, size_t data_len)
788 {
789 	struct ieee802_1x_hdr *hdr;
790 	struct wpa_eapol_key *key;
791 	u16 key_info, key_data_length;
792 	enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
793 	       SMK_M1, SMK_M3, SMK_ERROR } msg;
794 	char *msgtxt;
795 	struct wpa_eapol_ie_parse kde;
796 	int ft;
797 	const u8 *eapol_key_ie;
798 	size_t eapol_key_ie_len;
799 
800 	if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
801 		return;
802 
803 	if (data_len < sizeof(*hdr) + sizeof(*key))
804 		return;
805 
806 	hdr = (struct ieee802_1x_hdr *) data;
807 	key = (struct wpa_eapol_key *) (hdr + 1);
808 	key_info = WPA_GET_BE16(key->key_info);
809 	key_data_length = WPA_GET_BE16(key->key_data_length);
810 	wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
811 		   " key_info=0x%x type=%u key_data_length=%u",
812 		   MAC2STR(sm->addr), key_info, key->type, key_data_length);
813 	if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
814 		wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
815 			   "key_data overflow (%d > %lu)",
816 			   key_data_length,
817 			   (unsigned long) (data_len - sizeof(*hdr) -
818 					    sizeof(*key)));
819 		return;
820 	}
821 
822 	if (sm->wpa == WPA_VERSION_WPA2) {
823 		if (key->type == EAPOL_KEY_TYPE_WPA) {
824 			/*
825 			 * Some deployed station implementations seem to send
826 			 * msg 4/4 with incorrect type value in WPA2 mode.
827 			 */
828 			wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
829 				   "with unexpected WPA type in RSN mode");
830 		} else if (key->type != EAPOL_KEY_TYPE_RSN) {
831 			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
832 				   "unexpected type %d in RSN mode",
833 				   key->type);
834 			return;
835 		}
836 	} else {
837 		if (key->type != EAPOL_KEY_TYPE_WPA) {
838 			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
839 				   "unexpected type %d in WPA mode",
840 				   key->type);
841 			return;
842 		}
843 	}
844 
845 	wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
846 		    WPA_NONCE_LEN);
847 	wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
848 		    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
849 
850 	/* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
851 	 * are set */
852 
853 	if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
854 	    (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
855 		if (key_info & WPA_KEY_INFO_ERROR) {
856 			msg = SMK_ERROR;
857 			msgtxt = "SMK Error";
858 		} else {
859 			msg = SMK_M1;
860 			msgtxt = "SMK M1";
861 		}
862 	} else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
863 		msg = SMK_M3;
864 		msgtxt = "SMK M3";
865 	} else if (key_info & WPA_KEY_INFO_REQUEST) {
866 		msg = REQUEST;
867 		msgtxt = "Request";
868 	} else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
869 		msg = GROUP_2;
870 		msgtxt = "2/2 Group";
871 	} else if (key_data_length == 0) {
872 		msg = PAIRWISE_4;
873 		msgtxt = "4/4 Pairwise";
874 	} else {
875 		msg = PAIRWISE_2;
876 		msgtxt = "2/4 Pairwise";
877 	}
878 
879 	/* TODO: key_info type validation for PeerKey */
880 	if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
881 	    msg == GROUP_2) {
882 		u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
883 		if (sm->pairwise == WPA_CIPHER_CCMP ||
884 		    sm->pairwise == WPA_CIPHER_GCMP) {
885 			if (wpa_use_aes_cmac(sm) &&
886 			    sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
887 			    ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
888 				wpa_auth_logger(wpa_auth, sm->addr,
889 						LOGGER_WARNING,
890 						"advertised support for "
891 						"AES-128-CMAC, but did not "
892 						"use it");
893 				return;
894 			}
895 
896 			if (!wpa_use_aes_cmac(sm) &&
897 			    ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
898 				wpa_auth_logger(wpa_auth, sm->addr,
899 						LOGGER_WARNING,
900 						"did not use HMAC-SHA1-AES "
901 						"with CCMP/GCMP");
902 				return;
903 			}
904 		}
905 	}
906 
907 	if (key_info & WPA_KEY_INFO_REQUEST) {
908 		if (sm->req_replay_counter_used &&
909 		    os_memcmp(key->replay_counter, sm->req_replay_counter,
910 			      WPA_REPLAY_COUNTER_LEN) <= 0) {
911 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
912 					"received EAPOL-Key request with "
913 					"replayed counter");
914 			return;
915 		}
916 	}
917 
918 	if (!(key_info & WPA_KEY_INFO_REQUEST) &&
919 	    !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
920 		int i;
921 
922 		if (msg == PAIRWISE_2 &&
923 		    wpa_replay_counter_valid(sm->prev_key_replay,
924 					     key->replay_counter) &&
925 		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
926 		    os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
927 		{
928 			/*
929 			 * Some supplicant implementations (e.g., Windows XP
930 			 * WZC) update SNonce for each EAPOL-Key 2/4. This
931 			 * breaks the workaround on accepting any of the
932 			 * pending requests, so allow the SNonce to be updated
933 			 * even if we have already sent out EAPOL-Key 3/4.
934 			 */
935 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
936 					 "Process SNonce update from STA "
937 					 "based on retransmitted EAPOL-Key "
938 					 "1/4");
939 			sm->update_snonce = 1;
940 			wpa_replay_counter_mark_invalid(sm->prev_key_replay,
941 							key->replay_counter);
942 			goto continue_processing;
943 		}
944 
945 		if (msg == PAIRWISE_2 &&
946 		    wpa_replay_counter_valid(sm->prev_key_replay,
947 					     key->replay_counter) &&
948 		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
949 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
950 					 "ignore retransmitted EAPOL-Key %s - "
951 					 "SNonce did not change", msgtxt);
952 		} else {
953 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
954 					 "received EAPOL-Key %s with "
955 					 "unexpected replay counter", msgtxt);
956 		}
957 		for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
958 			if (!sm->key_replay[i].valid)
959 				break;
960 			wpa_hexdump(MSG_DEBUG, "pending replay counter",
961 				    sm->key_replay[i].counter,
962 				    WPA_REPLAY_COUNTER_LEN);
963 		}
964 		wpa_hexdump(MSG_DEBUG, "received replay counter",
965 			    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
966 		return;
967 	}
968 
969 continue_processing:
970 	switch (msg) {
971 	case PAIRWISE_2:
972 		if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
973 		    sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
974 		    (!sm->update_snonce ||
975 		     sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
976 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
977 					 "received EAPOL-Key msg 2/4 in "
978 					 "invalid state (%d) - dropped",
979 					 sm->wpa_ptk_state);
980 			return;
981 		}
982 		random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
983 		if (sm->group->reject_4way_hs_for_entropy) {
984 			/*
985 			 * The system did not have enough entropy to generate
986 			 * strong random numbers. Reject the first 4-way
987 			 * handshake(s) and collect some entropy based on the
988 			 * information from it. Once enough entropy is
989 			 * available, the next atempt will trigger GMK/Key
990 			 * Counter update and the station will be allowed to
991 			 * continue.
992 			 */
993 			wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
994 				   "collect more entropy for random number "
995 				   "generation");
996 			random_mark_pool_ready();
997 			wpa_sta_disconnect(wpa_auth, sm->addr);
998 			return;
999 		}
1000 		if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
1001 				      &kde) < 0) {
1002 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1003 					 "received EAPOL-Key msg 2/4 with "
1004 					 "invalid Key Data contents");
1005 			return;
1006 		}
1007 		if (kde.rsn_ie) {
1008 			eapol_key_ie = kde.rsn_ie;
1009 			eapol_key_ie_len = kde.rsn_ie_len;
1010 		} else if (kde.osen) {
1011 			eapol_key_ie = kde.osen;
1012 			eapol_key_ie_len = kde.osen_len;
1013 		} else {
1014 			eapol_key_ie = kde.wpa_ie;
1015 			eapol_key_ie_len = kde.wpa_ie_len;
1016 		}
1017 		ft = sm->wpa == WPA_VERSION_WPA2 &&
1018 			wpa_key_mgmt_ft(sm->wpa_key_mgmt);
1019 		if (sm->wpa_ie == NULL ||
1020 		    wpa_compare_rsn_ie(ft,
1021 				       sm->wpa_ie, sm->wpa_ie_len,
1022 				       eapol_key_ie, eapol_key_ie_len)) {
1023 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1024 					"WPA IE from (Re)AssocReq did not "
1025 					"match with msg 2/4");
1026 			if (sm->wpa_ie) {
1027 				wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
1028 					    sm->wpa_ie, sm->wpa_ie_len);
1029 			}
1030 			wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
1031 				    eapol_key_ie, eapol_key_ie_len);
1032 			/* MLME-DEAUTHENTICATE.request */
1033 			wpa_sta_disconnect(wpa_auth, sm->addr);
1034 			return;
1035 		}
1036 #ifdef CONFIG_IEEE80211R
1037 		if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
1038 			wpa_sta_disconnect(wpa_auth, sm->addr);
1039 			return;
1040 		}
1041 #endif /* CONFIG_IEEE80211R */
1042 #ifdef CONFIG_P2P
1043 		if (kde.ip_addr_req && kde.ip_addr_req[0] &&
1044 		    wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
1045 			int idx;
1046 			wpa_printf(MSG_DEBUG, "P2P: IP address requested in "
1047 				   "EAPOL-Key exchange");
1048 			idx = bitfield_get_first_zero(wpa_auth->ip_pool);
1049 			if (idx >= 0) {
1050 				u32 start = WPA_GET_BE32(wpa_auth->conf.
1051 							 ip_addr_start);
1052 				bitfield_set(wpa_auth->ip_pool, idx);
1053 				WPA_PUT_BE32(sm->ip_addr, start + idx);
1054 				wpa_printf(MSG_DEBUG, "P2P: Assigned IP "
1055 					   "address %u.%u.%u.%u to " MACSTR,
1056 					   sm->ip_addr[0], sm->ip_addr[1],
1057 					   sm->ip_addr[2], sm->ip_addr[3],
1058 					   MAC2STR(sm->addr));
1059 			}
1060 		}
1061 #endif /* CONFIG_P2P */
1062 		break;
1063 	case PAIRWISE_4:
1064 		if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1065 		    !sm->PTK_valid) {
1066 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1067 					 "received EAPOL-Key msg 4/4 in "
1068 					 "invalid state (%d) - dropped",
1069 					 sm->wpa_ptk_state);
1070 			return;
1071 		}
1072 		break;
1073 	case GROUP_2:
1074 		if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1075 		    || !sm->PTK_valid) {
1076 			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1077 					 "received EAPOL-Key msg 2/2 in "
1078 					 "invalid state (%d) - dropped",
1079 					 sm->wpa_ptk_group_state);
1080 			return;
1081 		}
1082 		break;
1083 #ifdef CONFIG_PEERKEY
1084 	case SMK_M1:
1085 	case SMK_M3:
1086 	case SMK_ERROR:
1087 		if (!wpa_auth->conf.peerkey) {
1088 			wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1089 				   "PeerKey use disabled - ignoring message");
1090 			return;
1091 		}
1092 		if (!sm->PTK_valid) {
1093 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1094 					"received EAPOL-Key msg SMK in "
1095 					"invalid state - dropped");
1096 			return;
1097 		}
1098 		break;
1099 #else /* CONFIG_PEERKEY */
1100 	case SMK_M1:
1101 	case SMK_M3:
1102 	case SMK_ERROR:
1103 		return; /* STSL disabled - ignore SMK messages */
1104 #endif /* CONFIG_PEERKEY */
1105 	case REQUEST:
1106 		break;
1107 	}
1108 
1109 	wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1110 			 "received EAPOL-Key frame (%s)", msgtxt);
1111 
1112 	if (key_info & WPA_KEY_INFO_ACK) {
1113 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1114 				"received invalid EAPOL-Key: Key Ack set");
1115 		return;
1116 	}
1117 
1118 	if (!(key_info & WPA_KEY_INFO_MIC)) {
1119 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1120 				"received invalid EAPOL-Key: Key MIC not set");
1121 		return;
1122 	}
1123 
1124 	sm->MICVerified = FALSE;
1125 	if (sm->PTK_valid && !sm->update_snonce) {
1126 		if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1127 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1128 					"received EAPOL-Key with invalid MIC");
1129 			return;
1130 		}
1131 		sm->MICVerified = TRUE;
1132 		eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1133 		sm->pending_1_of_4_timeout = 0;
1134 	}
1135 
1136 	if (key_info & WPA_KEY_INFO_REQUEST) {
1137 		if (sm->MICVerified) {
1138 			sm->req_replay_counter_used = 1;
1139 			os_memcpy(sm->req_replay_counter, key->replay_counter,
1140 				  WPA_REPLAY_COUNTER_LEN);
1141 		} else {
1142 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1143 					"received EAPOL-Key request with "
1144 					"invalid MIC");
1145 			return;
1146 		}
1147 
1148 		/*
1149 		 * TODO: should decrypt key data field if encryption was used;
1150 		 * even though MAC address KDE is not normally encrypted,
1151 		 * supplicant is allowed to encrypt it.
1152 		 */
1153 		if (msg == SMK_ERROR) {
1154 #ifdef CONFIG_PEERKEY
1155 			wpa_smk_error(wpa_auth, sm, key);
1156 #endif /* CONFIG_PEERKEY */
1157 			return;
1158 		} else if (key_info & WPA_KEY_INFO_ERROR) {
1159 			if (wpa_receive_error_report(
1160 				    wpa_auth, sm,
1161 				    !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1162 				return; /* STA entry was removed */
1163 		} else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1164 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1165 					"received EAPOL-Key Request for new "
1166 					"4-Way Handshake");
1167 			wpa_request_new_ptk(sm);
1168 #ifdef CONFIG_PEERKEY
1169 		} else if (msg == SMK_M1) {
1170 			wpa_smk_m1(wpa_auth, sm, key);
1171 #endif /* CONFIG_PEERKEY */
1172 		} else if (key_data_length > 0 &&
1173 			   wpa_parse_kde_ies((const u8 *) (key + 1),
1174 					     key_data_length, &kde) == 0 &&
1175 			   kde.mac_addr) {
1176 		} else {
1177 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1178 					"received EAPOL-Key Request for GTK "
1179 					"rekeying");
1180 			eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1181 			wpa_rekey_gtk(wpa_auth, NULL);
1182 		}
1183 	} else {
1184 		/* Do not allow the same key replay counter to be reused. */
1185 		wpa_replay_counter_mark_invalid(sm->key_replay,
1186 						key->replay_counter);
1187 
1188 		if (msg == PAIRWISE_2) {
1189 			/*
1190 			 * Maintain a copy of the pending EAPOL-Key frames in
1191 			 * case the EAPOL-Key frame was retransmitted. This is
1192 			 * needed to allow EAPOL-Key msg 2/4 reply to another
1193 			 * pending msg 1/4 to update the SNonce to work around
1194 			 * unexpected supplicant behavior.
1195 			 */
1196 			os_memcpy(sm->prev_key_replay, sm->key_replay,
1197 				  sizeof(sm->key_replay));
1198 		} else {
1199 			os_memset(sm->prev_key_replay, 0,
1200 				  sizeof(sm->prev_key_replay));
1201 		}
1202 
1203 		/*
1204 		 * Make sure old valid counters are not accepted anymore and
1205 		 * do not get copied again.
1206 		 */
1207 		wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1208 	}
1209 
1210 #ifdef CONFIG_PEERKEY
1211 	if (msg == SMK_M3) {
1212 		wpa_smk_m3(wpa_auth, sm, key);
1213 		return;
1214 	}
1215 #endif /* CONFIG_PEERKEY */
1216 
1217 	os_free(sm->last_rx_eapol_key);
1218 	sm->last_rx_eapol_key = os_malloc(data_len);
1219 	if (sm->last_rx_eapol_key == NULL)
1220 		return;
1221 	os_memcpy(sm->last_rx_eapol_key, data, data_len);
1222 	sm->last_rx_eapol_key_len = data_len;
1223 
1224 	sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1225 	sm->EAPOLKeyReceived = TRUE;
1226 	sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1227 	sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1228 	os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1229 	wpa_sm_step(sm);
1230 }
1231 
1232 
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1233 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1234 			  const u8 *gnonce, u8 *gtk, size_t gtk_len)
1235 {
1236 	u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1237 	u8 *pos;
1238 	int ret = 0;
1239 
1240 	/* GTK = PRF-X(GMK, "Group key expansion",
1241 	 *	AA || GNonce || Time || random data)
1242 	 * The example described in the IEEE 802.11 standard uses only AA and
1243 	 * GNonce as inputs here. Add some more entropy since this derivation
1244 	 * is done only at the Authenticator and as such, does not need to be
1245 	 * exactly same.
1246 	 */
1247 	os_memcpy(data, addr, ETH_ALEN);
1248 	os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1249 	pos = data + ETH_ALEN + WPA_NONCE_LEN;
1250 	wpa_get_ntp_timestamp(pos);
1251 	pos += 8;
1252 	if (random_get_bytes(pos, 16) < 0)
1253 		ret = -1;
1254 
1255 #ifdef CONFIG_IEEE80211W
1256 	sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1257 #else /* CONFIG_IEEE80211W */
1258 	if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1259 	    < 0)
1260 		ret = -1;
1261 #endif /* CONFIG_IEEE80211W */
1262 
1263 	return ret;
1264 }
1265 
1266 
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1267 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1268 {
1269 	struct wpa_authenticator *wpa_auth = eloop_ctx;
1270 	struct wpa_state_machine *sm = timeout_ctx;
1271 
1272 	sm->pending_1_of_4_timeout = 0;
1273 	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1274 	sm->TimeoutEvt = TRUE;
1275 	wpa_sm_step(sm);
1276 }
1277 
1278 
__wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr,int force_version)1279 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1280 		      struct wpa_state_machine *sm, int key_info,
1281 		      const u8 *key_rsc, const u8 *nonce,
1282 		      const u8 *kde, size_t kde_len,
1283 		      int keyidx, int encr, int force_version)
1284 {
1285 	struct ieee802_1x_hdr *hdr;
1286 	struct wpa_eapol_key *key;
1287 	size_t len;
1288 	int alg;
1289 	int key_data_len, pad_len = 0;
1290 	u8 *buf, *pos;
1291 	int version, pairwise;
1292 	int i;
1293 
1294 	len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1295 
1296 	if (force_version)
1297 		version = force_version;
1298 	else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
1299 		version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1300 	else if (wpa_use_aes_cmac(sm))
1301 		version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1302 	else if (sm->pairwise != WPA_CIPHER_TKIP)
1303 		version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1304 	else
1305 		version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1306 
1307 	pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1308 
1309 	wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1310 		   "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1311 		   "encr=%d)",
1312 		   version,
1313 		   (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1314 		   (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1315 		   (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1316 		   (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1317 		   pairwise, (unsigned long) kde_len, keyidx, encr);
1318 
1319 	key_data_len = kde_len;
1320 
1321 	if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1322 	     sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1323 	     version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1324 		pad_len = key_data_len % 8;
1325 		if (pad_len)
1326 			pad_len = 8 - pad_len;
1327 		key_data_len += pad_len + 8;
1328 	}
1329 
1330 	len += key_data_len;
1331 
1332 	hdr = os_zalloc(len);
1333 	if (hdr == NULL)
1334 		return;
1335 	hdr->version = wpa_auth->conf.eapol_version;
1336 	hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1337 	hdr->length = host_to_be16(len  - sizeof(*hdr));
1338 	key = (struct wpa_eapol_key *) (hdr + 1);
1339 
1340 	key->type = sm->wpa == WPA_VERSION_WPA2 ?
1341 		EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1342 	key_info |= version;
1343 	if (encr && sm->wpa == WPA_VERSION_WPA2)
1344 		key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1345 	if (sm->wpa != WPA_VERSION_WPA2)
1346 		key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1347 	WPA_PUT_BE16(key->key_info, key_info);
1348 
1349 	alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1350 	WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1351 	if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1352 		WPA_PUT_BE16(key->key_length, 0);
1353 
1354 	/* FIX: STSL: what to use as key_replay_counter? */
1355 	for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1356 		sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1357 		os_memcpy(sm->key_replay[i].counter,
1358 			  sm->key_replay[i - 1].counter,
1359 			  WPA_REPLAY_COUNTER_LEN);
1360 	}
1361 	inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1362 	os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1363 		  WPA_REPLAY_COUNTER_LEN);
1364 	sm->key_replay[0].valid = TRUE;
1365 
1366 	if (nonce)
1367 		os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1368 
1369 	if (key_rsc)
1370 		os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1371 
1372 	if (kde && !encr) {
1373 		os_memcpy(key + 1, kde, kde_len);
1374 		WPA_PUT_BE16(key->key_data_length, kde_len);
1375 	} else if (encr && kde) {
1376 		buf = os_zalloc(key_data_len);
1377 		if (buf == NULL) {
1378 			os_free(hdr);
1379 			return;
1380 		}
1381 		pos = buf;
1382 		os_memcpy(pos, kde, kde_len);
1383 		pos += kde_len;
1384 
1385 		if (pad_len)
1386 			*pos++ = 0xdd;
1387 
1388 		wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1389 				buf, key_data_len);
1390 		if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1391 		    sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1392 		    version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1393 			if (aes_wrap(sm->PTK.kek, 16,
1394 				     (key_data_len - 8) / 8, buf,
1395 				     (u8 *) (key + 1))) {
1396 				os_free(hdr);
1397 				os_free(buf);
1398 				return;
1399 			}
1400 			WPA_PUT_BE16(key->key_data_length, key_data_len);
1401 		} else {
1402 			u8 ek[32];
1403 			os_memcpy(key->key_iv,
1404 				  sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1405 			inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1406 			os_memcpy(ek, key->key_iv, 16);
1407 			os_memcpy(ek + 16, sm->PTK.kek, 16);
1408 			os_memcpy(key + 1, buf, key_data_len);
1409 			rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1410 			WPA_PUT_BE16(key->key_data_length, key_data_len);
1411 		}
1412 		os_free(buf);
1413 	}
1414 
1415 	if (key_info & WPA_KEY_INFO_MIC) {
1416 		if (!sm->PTK_valid) {
1417 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1418 					"PTK not valid when sending EAPOL-Key "
1419 					"frame");
1420 			os_free(hdr);
1421 			return;
1422 		}
1423 		wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1424 				  key->key_mic);
1425 #ifdef CONFIG_TESTING_OPTIONS
1426 		if (!pairwise &&
1427 		    wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1428 		    drand48() <
1429 		    wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1430 			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1431 					"Corrupting group EAPOL-Key Key MIC");
1432 			key->key_mic[0]++;
1433 		}
1434 #endif /* CONFIG_TESTING_OPTIONS */
1435 	}
1436 
1437 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1438 			   1);
1439 	wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1440 			    sm->pairwise_set);
1441 	os_free(hdr);
1442 }
1443 
1444 
wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr)1445 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1446 			   struct wpa_state_machine *sm, int key_info,
1447 			   const u8 *key_rsc, const u8 *nonce,
1448 			   const u8 *kde, size_t kde_len,
1449 			   int keyidx, int encr)
1450 {
1451 	int timeout_ms;
1452 	int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1453 	int ctr;
1454 
1455 	if (sm == NULL)
1456 		return;
1457 
1458 	__wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1459 			 keyidx, encr, 0);
1460 
1461 	ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1462 	if (ctr == 1 && wpa_auth->conf.tx_status)
1463 		timeout_ms = pairwise ? eapol_key_timeout_first :
1464 			eapol_key_timeout_first_group;
1465 	else
1466 		timeout_ms = eapol_key_timeout_subseq;
1467 	if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1468 		sm->pending_1_of_4_timeout = 1;
1469 	wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1470 		   "counter %d)", timeout_ms, ctr);
1471 	eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1472 			       wpa_send_eapol_timeout, wpa_auth, sm);
1473 }
1474 
1475 
wpa_verify_key_mic(struct wpa_ptk * PTK,u8 * data,size_t data_len)1476 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1477 {
1478 	struct ieee802_1x_hdr *hdr;
1479 	struct wpa_eapol_key *key;
1480 	u16 key_info;
1481 	int ret = 0;
1482 	u8 mic[16];
1483 
1484 	if (data_len < sizeof(*hdr) + sizeof(*key))
1485 		return -1;
1486 
1487 	hdr = (struct ieee802_1x_hdr *) data;
1488 	key = (struct wpa_eapol_key *) (hdr + 1);
1489 	key_info = WPA_GET_BE16(key->key_info);
1490 	os_memcpy(mic, key->key_mic, 16);
1491 	os_memset(key->key_mic, 0, 16);
1492 	if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1493 			      data, data_len, key->key_mic) ||
1494 	    os_memcmp_const(mic, key->key_mic, 16) != 0)
1495 		ret = -1;
1496 	os_memcpy(key->key_mic, mic, 16);
1497 	return ret;
1498 }
1499 
1500 
wpa_remove_ptk(struct wpa_state_machine * sm)1501 void wpa_remove_ptk(struct wpa_state_machine *sm)
1502 {
1503 	sm->PTK_valid = FALSE;
1504 	os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1505 	wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1506 	sm->pairwise_set = FALSE;
1507 	eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1508 }
1509 
1510 
wpa_auth_sm_event(struct wpa_state_machine * sm,wpa_event event)1511 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1512 {
1513 	int remove_ptk = 1;
1514 
1515 	if (sm == NULL)
1516 		return -1;
1517 
1518 	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1519 			 "event %d notification", event);
1520 
1521 	switch (event) {
1522 	case WPA_AUTH:
1523 	case WPA_ASSOC:
1524 		break;
1525 	case WPA_DEAUTH:
1526 	case WPA_DISASSOC:
1527 		sm->DeauthenticationRequest = TRUE;
1528 		break;
1529 	case WPA_REAUTH:
1530 	case WPA_REAUTH_EAPOL:
1531 		if (!sm->started) {
1532 			/*
1533 			 * When using WPS, we may end up here if the STA
1534 			 * manages to re-associate without the previous STA
1535 			 * entry getting removed. Consequently, we need to make
1536 			 * sure that the WPA state machines gets initialized
1537 			 * properly at this point.
1538 			 */
1539 			wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1540 				   "started - initialize now");
1541 			sm->started = 1;
1542 			sm->Init = TRUE;
1543 			if (wpa_sm_step(sm) == 1)
1544 				return 1; /* should not really happen */
1545 			sm->Init = FALSE;
1546 			sm->AuthenticationRequest = TRUE;
1547 			break;
1548 		}
1549 		if (sm->GUpdateStationKeys) {
1550 			/*
1551 			 * Reauthentication cancels the pending group key
1552 			 * update for this STA.
1553 			 */
1554 			sm->group->GKeyDoneStations--;
1555 			sm->GUpdateStationKeys = FALSE;
1556 			sm->PtkGroupInit = TRUE;
1557 		}
1558 		sm->ReAuthenticationRequest = TRUE;
1559 		break;
1560 	case WPA_ASSOC_FT:
1561 #ifdef CONFIG_IEEE80211R
1562 		wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1563 			   "after association");
1564 		wpa_ft_install_ptk(sm);
1565 
1566 		/* Using FT protocol, not WPA auth state machine */
1567 		sm->ft_completed = 1;
1568 		return 0;
1569 #else /* CONFIG_IEEE80211R */
1570 		break;
1571 #endif /* CONFIG_IEEE80211R */
1572 	}
1573 
1574 #ifdef CONFIG_IEEE80211R
1575 	sm->ft_completed = 0;
1576 #endif /* CONFIG_IEEE80211R */
1577 
1578 #ifdef CONFIG_IEEE80211W
1579 	if (sm->mgmt_frame_prot && event == WPA_AUTH)
1580 		remove_ptk = 0;
1581 #endif /* CONFIG_IEEE80211W */
1582 
1583 	if (remove_ptk) {
1584 		sm->PTK_valid = FALSE;
1585 		os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1586 
1587 		if (event != WPA_REAUTH_EAPOL)
1588 			wpa_remove_ptk(sm);
1589 	}
1590 
1591 	return wpa_sm_step(sm);
1592 }
1593 
1594 
SM_STATE(WPA_PTK,INITIALIZE)1595 SM_STATE(WPA_PTK, INITIALIZE)
1596 {
1597 	SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1598 	if (sm->Init) {
1599 		/* Init flag is not cleared here, so avoid busy
1600 		 * loop by claiming nothing changed. */
1601 		sm->changed = FALSE;
1602 	}
1603 
1604 	sm->keycount = 0;
1605 	if (sm->GUpdateStationKeys)
1606 		sm->group->GKeyDoneStations--;
1607 	sm->GUpdateStationKeys = FALSE;
1608 	if (sm->wpa == WPA_VERSION_WPA)
1609 		sm->PInitAKeys = FALSE;
1610 	if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1611 	       * Local AA > Remote AA)) */) {
1612 		sm->Pair = TRUE;
1613 	}
1614 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1615 	wpa_remove_ptk(sm);
1616 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1617 	sm->TimeoutCtr = 0;
1618 	if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1619 		wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1620 				   WPA_EAPOL_authorized, 0);
1621 	}
1622 }
1623 
1624 
SM_STATE(WPA_PTK,DISCONNECT)1625 SM_STATE(WPA_PTK, DISCONNECT)
1626 {
1627 	SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1628 	sm->Disconnect = FALSE;
1629 	wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1630 }
1631 
1632 
SM_STATE(WPA_PTK,DISCONNECTED)1633 SM_STATE(WPA_PTK, DISCONNECTED)
1634 {
1635 	SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1636 	sm->DeauthenticationRequest = FALSE;
1637 }
1638 
1639 
SM_STATE(WPA_PTK,AUTHENTICATION)1640 SM_STATE(WPA_PTK, AUTHENTICATION)
1641 {
1642 	SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1643 	os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1644 	sm->PTK_valid = FALSE;
1645 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1646 			   1);
1647 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1648 	sm->AuthenticationRequest = FALSE;
1649 }
1650 
1651 
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1652 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1653 				  struct wpa_group *group)
1654 {
1655 	if (group->first_sta_seen)
1656 		return;
1657 	/*
1658 	 * System has run bit further than at the time hostapd was started
1659 	 * potentially very early during boot up. This provides better chances
1660 	 * of collecting more randomness on embedded systems. Re-initialize the
1661 	 * GMK and Counter here to improve their strength if there was not
1662 	 * enough entropy available immediately after system startup.
1663 	 */
1664 	wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1665 		   "station");
1666 	if (random_pool_ready() != 1) {
1667 		wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1668 			   "to proceed - reject first 4-way handshake");
1669 		group->reject_4way_hs_for_entropy = TRUE;
1670 	} else {
1671 		group->first_sta_seen = TRUE;
1672 		group->reject_4way_hs_for_entropy = FALSE;
1673 	}
1674 
1675 	wpa_group_init_gmk_and_counter(wpa_auth, group);
1676 	wpa_gtk_update(wpa_auth, group);
1677 	wpa_group_config_group_keys(wpa_auth, group);
1678 }
1679 
1680 
SM_STATE(WPA_PTK,AUTHENTICATION2)1681 SM_STATE(WPA_PTK, AUTHENTICATION2)
1682 {
1683 	SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1684 
1685 	wpa_group_ensure_init(sm->wpa_auth, sm->group);
1686 	sm->ReAuthenticationRequest = FALSE;
1687 
1688 	/*
1689 	 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1690 	 * ambiguous. The Authenticator state machine uses a counter that is
1691 	 * incremented by one for each 4-way handshake. However, the security
1692 	 * analysis of 4-way handshake points out that unpredictable nonces
1693 	 * help in preventing precomputation attacks. Instead of the state
1694 	 * machine definition, use an unpredictable nonce value here to provide
1695 	 * stronger protection against potential precomputation attacks.
1696 	 */
1697 	if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1698 		wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1699 			   "ANonce.");
1700 		sm->Disconnect = TRUE;
1701 		return;
1702 	}
1703 	wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1704 		    WPA_NONCE_LEN);
1705 	/* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1706 	 * logical place than INITIALIZE since AUTHENTICATION2 can be
1707 	 * re-entered on ReAuthenticationRequest without going through
1708 	 * INITIALIZE. */
1709 	sm->TimeoutCtr = 0;
1710 }
1711 
1712 
SM_STATE(WPA_PTK,INITPMK)1713 SM_STATE(WPA_PTK, INITPMK)
1714 {
1715 	u8 msk[2 * PMK_LEN];
1716 	size_t len = 2 * PMK_LEN;
1717 
1718 	SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1719 #ifdef CONFIG_IEEE80211R
1720 	sm->xxkey_len = 0;
1721 #endif /* CONFIG_IEEE80211R */
1722 	if (sm->pmksa) {
1723 		wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1724 		os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1725 	} else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1726 		wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1727 			   "(len=%lu)", (unsigned long) len);
1728 		os_memcpy(sm->PMK, msk, PMK_LEN);
1729 #ifdef CONFIG_IEEE80211R
1730 		if (len >= 2 * PMK_LEN) {
1731 			os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1732 			sm->xxkey_len = PMK_LEN;
1733 		}
1734 #endif /* CONFIG_IEEE80211R */
1735 	} else {
1736 		wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1737 	}
1738 
1739 	sm->req_replay_counter_used = 0;
1740 	/* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1741 	 * will break reauthentication since EAPOL state machines may not be
1742 	 * get into AUTHENTICATING state that clears keyRun before WPA state
1743 	 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1744 	 * state and takes PMK from the previously used AAA Key. This will
1745 	 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1746 	 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1747 	 * be good workaround for this issue. */
1748 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1749 }
1750 
1751 
SM_STATE(WPA_PTK,INITPSK)1752 SM_STATE(WPA_PTK, INITPSK)
1753 {
1754 	const u8 *psk;
1755 	SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1756 	psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1757 	if (psk) {
1758 		os_memcpy(sm->PMK, psk, PMK_LEN);
1759 #ifdef CONFIG_IEEE80211R
1760 		os_memcpy(sm->xxkey, psk, PMK_LEN);
1761 		sm->xxkey_len = PMK_LEN;
1762 #endif /* CONFIG_IEEE80211R */
1763 	}
1764 	sm->req_replay_counter_used = 0;
1765 }
1766 
1767 
SM_STATE(WPA_PTK,PTKSTART)1768 SM_STATE(WPA_PTK, PTKSTART)
1769 {
1770 	u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1771 	size_t pmkid_len = 0;
1772 
1773 	SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1774 	sm->PTKRequest = FALSE;
1775 	sm->TimeoutEvt = FALSE;
1776 
1777 	sm->TimeoutCtr++;
1778 	if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1779 		/* No point in sending the EAPOL-Key - we will disconnect
1780 		 * immediately following this. */
1781 		return;
1782 	}
1783 
1784 	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1785 			"sending 1/4 msg of 4-Way Handshake");
1786 	/*
1787 	 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1788 	 * one possible PSK for this STA.
1789 	 */
1790 	if (sm->wpa == WPA_VERSION_WPA2 &&
1791 	    wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
1792 	    sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
1793 		pmkid = buf;
1794 		pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1795 		pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1796 		pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1797 		RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1798 		if (sm->pmksa)
1799 			os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1800 				  sm->pmksa->pmkid, PMKID_LEN);
1801 		else {
1802 			/*
1803 			 * Calculate PMKID since no PMKSA cache entry was
1804 			 * available with pre-calculated PMKID.
1805 			 */
1806 			rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1807 				  sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1808 				  wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1809 		}
1810 	}
1811 	wpa_send_eapol(sm->wpa_auth, sm,
1812 		       WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1813 		       sm->ANonce, pmkid, pmkid_len, 0, 0);
1814 }
1815 
1816 
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk)1817 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1818 			  struct wpa_ptk *ptk)
1819 {
1820 	size_t ptk_len = wpa_cipher_key_len(sm->pairwise) + 32;
1821 #ifdef CONFIG_IEEE80211R
1822 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1823 		return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1824 #endif /* CONFIG_IEEE80211R */
1825 
1826 	wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1827 		       sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1828 		       (u8 *) ptk, ptk_len,
1829 		       wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1830 
1831 	return 0;
1832 }
1833 
1834 
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)1835 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1836 {
1837 	struct wpa_ptk PTK;
1838 	int ok = 0;
1839 	const u8 *pmk = NULL;
1840 
1841 	SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1842 	sm->EAPOLKeyReceived = FALSE;
1843 	sm->update_snonce = FALSE;
1844 
1845 	/* WPA with IEEE 802.1X: use the derived PMK from EAP
1846 	 * WPA-PSK: iterate through possible PSKs and select the one matching
1847 	 * the packet */
1848 	for (;;) {
1849 		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1850 			pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
1851 					       sm->p2p_dev_addr, pmk);
1852 			if (pmk == NULL)
1853 				break;
1854 		} else
1855 			pmk = sm->PMK;
1856 
1857 		wpa_derive_ptk(sm, pmk, &PTK);
1858 
1859 		if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1860 				       sm->last_rx_eapol_key_len) == 0) {
1861 			ok = 1;
1862 			break;
1863 		}
1864 
1865 		if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1866 			break;
1867 	}
1868 
1869 	if (!ok) {
1870 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1871 				"invalid MIC in msg 2/4 of 4-Way Handshake");
1872 		return;
1873 	}
1874 
1875 #ifdef CONFIG_IEEE80211R
1876 	if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1877 		/*
1878 		 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1879 		 * with the value we derived.
1880 		 */
1881 		if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1882 				    WPA_PMK_NAME_LEN) != 0) {
1883 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1884 					"PMKR1Name mismatch in FT 4-way "
1885 					"handshake");
1886 			wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1887 				    "Supplicant",
1888 				    sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1889 			wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1890 				    sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1891 			return;
1892 		}
1893 	}
1894 #endif /* CONFIG_IEEE80211R */
1895 
1896 	sm->pending_1_of_4_timeout = 0;
1897 	eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1898 
1899 	if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1900 		/* PSK may have changed from the previous choice, so update
1901 		 * state machine data based on whatever PSK was selected here.
1902 		 */
1903 		os_memcpy(sm->PMK, pmk, PMK_LEN);
1904 	}
1905 
1906 	sm->MICVerified = TRUE;
1907 
1908 	os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1909 	sm->PTK_valid = TRUE;
1910 }
1911 
1912 
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)1913 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1914 {
1915 	SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1916 	sm->TimeoutCtr = 0;
1917 }
1918 
1919 
1920 #ifdef CONFIG_IEEE80211W
1921 
ieee80211w_kde_len(struct wpa_state_machine * sm)1922 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1923 {
1924 	if (sm->mgmt_frame_prot) {
1925 		size_t len;
1926 		len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1927 		return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
1928 	}
1929 
1930 	return 0;
1931 }
1932 
1933 
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1934 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1935 {
1936 	struct wpa_igtk_kde igtk;
1937 	struct wpa_group *gsm = sm->group;
1938 	u8 rsc[WPA_KEY_RSC_LEN];
1939 	size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1940 
1941 	if (!sm->mgmt_frame_prot)
1942 		return pos;
1943 
1944 	igtk.keyid[0] = gsm->GN_igtk;
1945 	igtk.keyid[1] = 0;
1946 	if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1947 	    wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
1948 		os_memset(igtk.pn, 0, sizeof(igtk.pn));
1949 	else
1950 		os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
1951 	os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
1952 	if (sm->wpa_auth->conf.disable_gtk) {
1953 		/*
1954 		 * Provide unique random IGTK to each STA to prevent use of
1955 		 * IGTK in the BSS.
1956 		 */
1957 		if (random_get_bytes(igtk.igtk, len) < 0)
1958 			return pos;
1959 	}
1960 	pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1961 			  (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
1962 			  NULL, 0);
1963 
1964 	return pos;
1965 }
1966 
1967 #else /* CONFIG_IEEE80211W */
1968 
ieee80211w_kde_len(struct wpa_state_machine * sm)1969 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1970 {
1971 	return 0;
1972 }
1973 
1974 
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1975 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1976 {
1977 	return pos;
1978 }
1979 
1980 #endif /* CONFIG_IEEE80211W */
1981 
1982 
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)1983 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1984 {
1985 	u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1986 	size_t gtk_len, kde_len;
1987 	struct wpa_group *gsm = sm->group;
1988 	u8 *wpa_ie;
1989 	int wpa_ie_len, secure, keyidx, encr = 0;
1990 
1991 	SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1992 	sm->TimeoutEvt = FALSE;
1993 
1994 	sm->TimeoutCtr++;
1995 	if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1996 		/* No point in sending the EAPOL-Key - we will disconnect
1997 		 * immediately following this. */
1998 		return;
1999 	}
2000 
2001 	/* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2002 	   GTK[GN], IGTK, [FTIE], [TIE * 2])
2003 	 */
2004 	os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2005 	wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2006 	/* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2007 	wpa_ie = sm->wpa_auth->wpa_ie;
2008 	wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2009 	if (sm->wpa == WPA_VERSION_WPA &&
2010 	    (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2011 	    wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2012 		/* WPA-only STA, remove RSN IE */
2013 		wpa_ie = wpa_ie + wpa_ie[1] + 2;
2014 		wpa_ie_len = wpa_ie[1] + 2;
2015 	}
2016 	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2017 			"sending 3/4 msg of 4-Way Handshake");
2018 	if (sm->wpa == WPA_VERSION_WPA2) {
2019 		/* WPA2 send GTK in the 4-way handshake */
2020 		secure = 1;
2021 		gtk = gsm->GTK[gsm->GN - 1];
2022 		gtk_len = gsm->GTK_len;
2023 		if (sm->wpa_auth->conf.disable_gtk) {
2024 			/*
2025 			 * Provide unique random GTK to each STA to prevent use
2026 			 * of GTK in the BSS.
2027 			 */
2028 			if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2029 				return;
2030 			gtk = dummy_gtk;
2031 		}
2032 		keyidx = gsm->GN;
2033 		_rsc = rsc;
2034 		encr = 1;
2035 	} else {
2036 		/* WPA does not include GTK in msg 3/4 */
2037 		secure = 0;
2038 		gtk = NULL;
2039 		gtk_len = 0;
2040 		keyidx = 0;
2041 		_rsc = NULL;
2042 		if (sm->rx_eapol_key_secure) {
2043 			/*
2044 			 * It looks like Windows 7 supplicant tries to use
2045 			 * Secure bit in msg 2/4 after having reported Michael
2046 			 * MIC failure and it then rejects the 4-way handshake
2047 			 * if msg 3/4 does not set Secure bit. Work around this
2048 			 * by setting the Secure bit here even in the case of
2049 			 * WPA if the supplicant used it first.
2050 			 */
2051 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2052 					"STA used Secure bit in WPA msg 2/4 - "
2053 					"set Secure for 3/4 as workaround");
2054 			secure = 1;
2055 		}
2056 	}
2057 
2058 	kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2059 	if (gtk)
2060 		kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2061 #ifdef CONFIG_IEEE80211R
2062 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2063 		kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2064 		kde_len += 300; /* FTIE + 2 * TIE */
2065 	}
2066 #endif /* CONFIG_IEEE80211R */
2067 #ifdef CONFIG_P2P
2068 	if (WPA_GET_BE32(sm->ip_addr) > 0)
2069 		kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2070 #endif /* CONFIG_P2P */
2071 	kde = os_malloc(kde_len);
2072 	if (kde == NULL)
2073 		return;
2074 
2075 	pos = kde;
2076 	os_memcpy(pos, wpa_ie, wpa_ie_len);
2077 	pos += wpa_ie_len;
2078 #ifdef CONFIG_IEEE80211R
2079 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2080 		int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
2081 		if (res < 0) {
2082 			wpa_printf(MSG_ERROR, "FT: Failed to insert "
2083 				   "PMKR1Name into RSN IE in EAPOL-Key data");
2084 			os_free(kde);
2085 			return;
2086 		}
2087 		pos += res;
2088 	}
2089 #endif /* CONFIG_IEEE80211R */
2090 	if (gtk) {
2091 		u8 hdr[2];
2092 		hdr[0] = keyidx & 0x03;
2093 		hdr[1] = 0;
2094 		pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2095 				  gtk, gtk_len);
2096 	}
2097 	pos = ieee80211w_kde_add(sm, pos);
2098 
2099 #ifdef CONFIG_IEEE80211R
2100 	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2101 		int res;
2102 		struct wpa_auth_config *conf;
2103 
2104 		conf = &sm->wpa_auth->conf;
2105 		res = wpa_write_ftie(conf, conf->r0_key_holder,
2106 				     conf->r0_key_holder_len,
2107 				     NULL, NULL, pos, kde + kde_len - pos,
2108 				     NULL, 0);
2109 		if (res < 0) {
2110 			wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2111 				   "into EAPOL-Key Key Data");
2112 			os_free(kde);
2113 			return;
2114 		}
2115 		pos += res;
2116 
2117 		/* TIE[ReassociationDeadline] (TU) */
2118 		*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2119 		*pos++ = 5;
2120 		*pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2121 		WPA_PUT_LE32(pos, conf->reassociation_deadline);
2122 		pos += 4;
2123 
2124 		/* TIE[KeyLifetime] (seconds) */
2125 		*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2126 		*pos++ = 5;
2127 		*pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2128 		WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2129 		pos += 4;
2130 	}
2131 #endif /* CONFIG_IEEE80211R */
2132 #ifdef CONFIG_P2P
2133 	if (WPA_GET_BE32(sm->ip_addr) > 0) {
2134 		u8 addr[3 * 4];
2135 		os_memcpy(addr, sm->ip_addr, 4);
2136 		os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2137 		os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2138 		pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2139 				  addr, sizeof(addr), NULL, 0);
2140 	}
2141 #endif /* CONFIG_P2P */
2142 
2143 	wpa_send_eapol(sm->wpa_auth, sm,
2144 		       (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2145 		       WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2146 		       WPA_KEY_INFO_KEY_TYPE,
2147 		       _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2148 	os_free(kde);
2149 }
2150 
2151 
SM_STATE(WPA_PTK,PTKINITDONE)2152 SM_STATE(WPA_PTK, PTKINITDONE)
2153 {
2154 	SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2155 	sm->EAPOLKeyReceived = FALSE;
2156 	if (sm->Pair) {
2157 		enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2158 		int klen = wpa_cipher_key_len(sm->pairwise);
2159 		if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2160 				     sm->PTK.tk1, klen)) {
2161 			wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2162 			return;
2163 		}
2164 		/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2165 		sm->pairwise_set = TRUE;
2166 
2167 		if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2168 			eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2169 			eloop_register_timeout(sm->wpa_auth->conf.
2170 					       wpa_ptk_rekey, 0, wpa_rekey_ptk,
2171 					       sm->wpa_auth, sm);
2172 		}
2173 
2174 		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2175 			wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2176 					   WPA_EAPOL_authorized, 1);
2177 		}
2178 	}
2179 
2180 	if (0 /* IBSS == TRUE */) {
2181 		sm->keycount++;
2182 		if (sm->keycount == 2) {
2183 			wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2184 					   WPA_EAPOL_portValid, 1);
2185 		}
2186 	} else {
2187 		wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2188 				   1);
2189 	}
2190 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2191 	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2192 	if (sm->wpa == WPA_VERSION_WPA)
2193 		sm->PInitAKeys = TRUE;
2194 	else
2195 		sm->has_GTK = TRUE;
2196 	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2197 			 "pairwise key handshake completed (%s)",
2198 			 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2199 
2200 #ifdef CONFIG_IEEE80211R
2201 	wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2202 #endif /* CONFIG_IEEE80211R */
2203 }
2204 
2205 
SM_STEP(WPA_PTK)2206 SM_STEP(WPA_PTK)
2207 {
2208 	struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2209 
2210 	if (sm->Init)
2211 		SM_ENTER(WPA_PTK, INITIALIZE);
2212 	else if (sm->Disconnect
2213 		 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2214 		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2215 				"WPA_PTK: sm->Disconnect");
2216 		SM_ENTER(WPA_PTK, DISCONNECT);
2217 	}
2218 	else if (sm->DeauthenticationRequest)
2219 		SM_ENTER(WPA_PTK, DISCONNECTED);
2220 	else if (sm->AuthenticationRequest)
2221 		SM_ENTER(WPA_PTK, AUTHENTICATION);
2222 	else if (sm->ReAuthenticationRequest)
2223 		SM_ENTER(WPA_PTK, AUTHENTICATION2);
2224 	else if (sm->PTKRequest)
2225 		SM_ENTER(WPA_PTK, PTKSTART);
2226 	else switch (sm->wpa_ptk_state) {
2227 	case WPA_PTK_INITIALIZE:
2228 		break;
2229 	case WPA_PTK_DISCONNECT:
2230 		SM_ENTER(WPA_PTK, DISCONNECTED);
2231 		break;
2232 	case WPA_PTK_DISCONNECTED:
2233 		SM_ENTER(WPA_PTK, INITIALIZE);
2234 		break;
2235 	case WPA_PTK_AUTHENTICATION:
2236 		SM_ENTER(WPA_PTK, AUTHENTICATION2);
2237 		break;
2238 	case WPA_PTK_AUTHENTICATION2:
2239 		if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2240 		    wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2241 				       WPA_EAPOL_keyRun) > 0)
2242 			SM_ENTER(WPA_PTK, INITPMK);
2243 		else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2244 			 /* FIX: && 802.1X::keyRun */)
2245 			SM_ENTER(WPA_PTK, INITPSK);
2246 		break;
2247 	case WPA_PTK_INITPMK:
2248 		if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2249 				       WPA_EAPOL_keyAvailable) > 0)
2250 			SM_ENTER(WPA_PTK, PTKSTART);
2251 		else {
2252 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2253 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2254 					"INITPMK - keyAvailable = false");
2255 			SM_ENTER(WPA_PTK, DISCONNECT);
2256 		}
2257 		break;
2258 	case WPA_PTK_INITPSK:
2259 		if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2260 				     NULL))
2261 			SM_ENTER(WPA_PTK, PTKSTART);
2262 		else {
2263 			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2264 					"no PSK configured for the STA");
2265 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2266 			SM_ENTER(WPA_PTK, DISCONNECT);
2267 		}
2268 		break;
2269 	case WPA_PTK_PTKSTART:
2270 		if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2271 		    sm->EAPOLKeyPairwise)
2272 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2273 		else if (sm->TimeoutCtr >
2274 			 (int) dot11RSNAConfigPairwiseUpdateCount) {
2275 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2276 			wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2277 					 "PTKSTART: Retry limit %d reached",
2278 					 dot11RSNAConfigPairwiseUpdateCount);
2279 			SM_ENTER(WPA_PTK, DISCONNECT);
2280 		} else if (sm->TimeoutEvt)
2281 			SM_ENTER(WPA_PTK, PTKSTART);
2282 		break;
2283 	case WPA_PTK_PTKCALCNEGOTIATING:
2284 		if (sm->MICVerified)
2285 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2286 		else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2287 			 sm->EAPOLKeyPairwise)
2288 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2289 		else if (sm->TimeoutEvt)
2290 			SM_ENTER(WPA_PTK, PTKSTART);
2291 		break;
2292 	case WPA_PTK_PTKCALCNEGOTIATING2:
2293 		SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2294 		break;
2295 	case WPA_PTK_PTKINITNEGOTIATING:
2296 		if (sm->update_snonce)
2297 			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2298 		else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2299 			 sm->EAPOLKeyPairwise && sm->MICVerified)
2300 			SM_ENTER(WPA_PTK, PTKINITDONE);
2301 		else if (sm->TimeoutCtr >
2302 			 (int) dot11RSNAConfigPairwiseUpdateCount) {
2303 			wpa_auth->dot11RSNA4WayHandshakeFailures++;
2304 			wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2305 					 "PTKINITNEGOTIATING: Retry limit %d "
2306 					 "reached",
2307 					 dot11RSNAConfigPairwiseUpdateCount);
2308 			SM_ENTER(WPA_PTK, DISCONNECT);
2309 		} else if (sm->TimeoutEvt)
2310 			SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2311 		break;
2312 	case WPA_PTK_PTKINITDONE:
2313 		break;
2314 	}
2315 }
2316 
2317 
SM_STATE(WPA_PTK_GROUP,IDLE)2318 SM_STATE(WPA_PTK_GROUP, IDLE)
2319 {
2320 	SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2321 	if (sm->Init) {
2322 		/* Init flag is not cleared here, so avoid busy
2323 		 * loop by claiming nothing changed. */
2324 		sm->changed = FALSE;
2325 	}
2326 	sm->GTimeoutCtr = 0;
2327 }
2328 
2329 
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)2330 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2331 {
2332 	u8 rsc[WPA_KEY_RSC_LEN];
2333 	struct wpa_group *gsm = sm->group;
2334 	u8 *kde, *pos, hdr[2];
2335 	size_t kde_len;
2336 	u8 *gtk, dummy_gtk[32];
2337 
2338 	SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2339 
2340 	sm->GTimeoutCtr++;
2341 	if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2342 		/* No point in sending the EAPOL-Key - we will disconnect
2343 		 * immediately following this. */
2344 		return;
2345 	}
2346 
2347 	if (sm->wpa == WPA_VERSION_WPA)
2348 		sm->PInitAKeys = FALSE;
2349 	sm->TimeoutEvt = FALSE;
2350 	/* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2351 	os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2352 	if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2353 		wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2354 	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2355 			"sending 1/2 msg of Group Key Handshake");
2356 
2357 	gtk = gsm->GTK[gsm->GN - 1];
2358 	if (sm->wpa_auth->conf.disable_gtk) {
2359 		/*
2360 		 * Provide unique random GTK to each STA to prevent use
2361 		 * of GTK in the BSS.
2362 		 */
2363 		if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2364 			return;
2365 		gtk = dummy_gtk;
2366 	}
2367 	if (sm->wpa == WPA_VERSION_WPA2) {
2368 		kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2369 			ieee80211w_kde_len(sm);
2370 		kde = os_malloc(kde_len);
2371 		if (kde == NULL)
2372 			return;
2373 
2374 		pos = kde;
2375 		hdr[0] = gsm->GN & 0x03;
2376 		hdr[1] = 0;
2377 		pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2378 				  gtk, gsm->GTK_len);
2379 		pos = ieee80211w_kde_add(sm, pos);
2380 	} else {
2381 		kde = gtk;
2382 		pos = kde + gsm->GTK_len;
2383 	}
2384 
2385 	wpa_send_eapol(sm->wpa_auth, sm,
2386 		       WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2387 		       WPA_KEY_INFO_ACK |
2388 		       (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2389 		       rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2390 	if (sm->wpa == WPA_VERSION_WPA2)
2391 		os_free(kde);
2392 }
2393 
2394 
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)2395 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2396 {
2397 	SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2398 	sm->EAPOLKeyReceived = FALSE;
2399 	if (sm->GUpdateStationKeys)
2400 		sm->group->GKeyDoneStations--;
2401 	sm->GUpdateStationKeys = FALSE;
2402 	sm->GTimeoutCtr = 0;
2403 	/* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2404 	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2405 			 "group key handshake completed (%s)",
2406 			 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2407 	sm->has_GTK = TRUE;
2408 }
2409 
2410 
SM_STATE(WPA_PTK_GROUP,KEYERROR)2411 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2412 {
2413 	SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2414 	if (sm->GUpdateStationKeys)
2415 		sm->group->GKeyDoneStations--;
2416 	sm->GUpdateStationKeys = FALSE;
2417 	sm->Disconnect = TRUE;
2418 }
2419 
2420 
SM_STEP(WPA_PTK_GROUP)2421 SM_STEP(WPA_PTK_GROUP)
2422 {
2423 	if (sm->Init || sm->PtkGroupInit) {
2424 		SM_ENTER(WPA_PTK_GROUP, IDLE);
2425 		sm->PtkGroupInit = FALSE;
2426 	} else switch (sm->wpa_ptk_group_state) {
2427 	case WPA_PTK_GROUP_IDLE:
2428 		if (sm->GUpdateStationKeys ||
2429 		    (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2430 			SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2431 		break;
2432 	case WPA_PTK_GROUP_REKEYNEGOTIATING:
2433 		if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2434 		    !sm->EAPOLKeyPairwise && sm->MICVerified)
2435 			SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2436 		else if (sm->GTimeoutCtr >
2437 			 (int) dot11RSNAConfigGroupUpdateCount)
2438 			SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2439 		else if (sm->TimeoutEvt)
2440 			SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2441 		break;
2442 	case WPA_PTK_GROUP_KEYERROR:
2443 		SM_ENTER(WPA_PTK_GROUP, IDLE);
2444 		break;
2445 	case WPA_PTK_GROUP_REKEYESTABLISHED:
2446 		SM_ENTER(WPA_PTK_GROUP, IDLE);
2447 		break;
2448 	}
2449 }
2450 
2451 
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2452 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2453 			  struct wpa_group *group)
2454 {
2455 	int ret = 0;
2456 
2457 	os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2458 	inc_byte_array(group->Counter, WPA_NONCE_LEN);
2459 	if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2460 			   wpa_auth->addr, group->GNonce,
2461 			   group->GTK[group->GN - 1], group->GTK_len) < 0)
2462 		ret = -1;
2463 	wpa_hexdump_key(MSG_DEBUG, "GTK",
2464 			group->GTK[group->GN - 1], group->GTK_len);
2465 
2466 #ifdef CONFIG_IEEE80211W
2467 	if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2468 		size_t len;
2469 		len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2470 		os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2471 		inc_byte_array(group->Counter, WPA_NONCE_LEN);
2472 		if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2473 				   wpa_auth->addr, group->GNonce,
2474 				   group->IGTK[group->GN_igtk - 4], len) < 0)
2475 			ret = -1;
2476 		wpa_hexdump_key(MSG_DEBUG, "IGTK",
2477 				group->IGTK[group->GN_igtk - 4], len);
2478 	}
2479 #endif /* CONFIG_IEEE80211W */
2480 
2481 	return ret;
2482 }
2483 
2484 
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2485 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2486 			       struct wpa_group *group)
2487 {
2488 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2489 		   "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2490 	group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2491 	group->wpa_group_state = WPA_GROUP_GTK_INIT;
2492 
2493 	/* GTK[0..N] = 0 */
2494 	os_memset(group->GTK, 0, sizeof(group->GTK));
2495 	group->GN = 1;
2496 	group->GM = 2;
2497 #ifdef CONFIG_IEEE80211W
2498 	group->GN_igtk = 4;
2499 	group->GM_igtk = 5;
2500 #endif /* CONFIG_IEEE80211W */
2501 	/* GTK[GN] = CalcGTK() */
2502 	wpa_gtk_update(wpa_auth, group);
2503 }
2504 
2505 
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)2506 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2507 {
2508 	if (ctx != NULL && ctx != sm->group)
2509 		return 0;
2510 
2511 	if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2512 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2513 				"Not in PTKINITDONE; skip Group Key update");
2514 		sm->GUpdateStationKeys = FALSE;
2515 		return 0;
2516 	}
2517 	if (sm->GUpdateStationKeys) {
2518 		/*
2519 		 * This should not really happen, so add a debug log entry.
2520 		 * Since we clear the GKeyDoneStations before the loop, the
2521 		 * station needs to be counted here anyway.
2522 		 */
2523 		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2524 				"GUpdateStationKeys was already set when "
2525 				"marking station for GTK rekeying");
2526 	}
2527 
2528 	/* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2529 	if (sm->is_wnmsleep)
2530 		return 0;
2531 
2532 	sm->group->GKeyDoneStations++;
2533 	sm->GUpdateStationKeys = TRUE;
2534 
2535 	wpa_sm_step(sm);
2536 	return 0;
2537 }
2538 
2539 
2540 #ifdef CONFIG_WNM
2541 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)2542 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2543 {
2544 	if (sm == NULL || sm->is_wnmsleep)
2545 		return;
2546 
2547 	wpa_group_update_sta(sm, NULL);
2548 }
2549 
2550 
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)2551 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2552 {
2553 	if (sm)
2554 		sm->is_wnmsleep = !!flag;
2555 }
2556 
2557 
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)2558 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2559 {
2560 	struct wpa_group *gsm = sm->group;
2561 	u8 *start = pos;
2562 
2563 	/*
2564 	 * GTK subelement:
2565 	 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2566 	 * Key[5..32]
2567 	 */
2568 	*pos++ = WNM_SLEEP_SUBELEM_GTK;
2569 	*pos++ = 11 + gsm->GTK_len;
2570 	/* Key ID in B0-B1 of Key Info */
2571 	WPA_PUT_LE16(pos, gsm->GN & 0x03);
2572 	pos += 2;
2573 	*pos++ = gsm->GTK_len;
2574 	if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2575 		return 0;
2576 	pos += 8;
2577 	os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2578 	pos += gsm->GTK_len;
2579 
2580 	wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2581 		   gsm->GN);
2582 	wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2583 			gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2584 
2585 	return pos - start;
2586 }
2587 
2588 
2589 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)2590 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2591 {
2592 	struct wpa_group *gsm = sm->group;
2593 	u8 *start = pos;
2594 	size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2595 
2596 	/*
2597 	 * IGTK subelement:
2598 	 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2599 	 */
2600 	*pos++ = WNM_SLEEP_SUBELEM_IGTK;
2601 	*pos++ = 2 + 6 + len;
2602 	WPA_PUT_LE16(pos, gsm->GN_igtk);
2603 	pos += 2;
2604 	if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2605 		return 0;
2606 	pos += 6;
2607 
2608 	os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
2609 	pos += len;
2610 
2611 	wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2612 		   gsm->GN_igtk);
2613 	wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2614 			gsm->IGTK[gsm->GN_igtk - 4], len);
2615 
2616 	return pos - start;
2617 }
2618 #endif /* CONFIG_IEEE80211W */
2619 #endif /* CONFIG_WNM */
2620 
2621 
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2622 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2623 			      struct wpa_group *group)
2624 {
2625 	int tmp;
2626 
2627 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2628 		   "SETKEYS (VLAN-ID %d)", group->vlan_id);
2629 	group->changed = TRUE;
2630 	group->wpa_group_state = WPA_GROUP_SETKEYS;
2631 	group->GTKReKey = FALSE;
2632 	tmp = group->GM;
2633 	group->GM = group->GN;
2634 	group->GN = tmp;
2635 #ifdef CONFIG_IEEE80211W
2636 	tmp = group->GM_igtk;
2637 	group->GM_igtk = group->GN_igtk;
2638 	group->GN_igtk = tmp;
2639 #endif /* CONFIG_IEEE80211W */
2640 	/* "GKeyDoneStations = GNoStations" is done in more robust way by
2641 	 * counting the STAs that are marked with GUpdateStationKeys instead of
2642 	 * including all STAs that could be in not-yet-completed state. */
2643 	wpa_gtk_update(wpa_auth, group);
2644 
2645 	if (group->GKeyDoneStations) {
2646 		wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2647 			   "GKeyDoneStations=%d when starting new GTK rekey",
2648 			   group->GKeyDoneStations);
2649 		group->GKeyDoneStations = 0;
2650 	}
2651 	wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2652 	wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2653 		   group->GKeyDoneStations);
2654 }
2655 
2656 
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2657 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2658 				       struct wpa_group *group)
2659 {
2660 	int ret = 0;
2661 
2662 	if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2663 			     wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2664 			     broadcast_ether_addr, group->GN,
2665 			     group->GTK[group->GN - 1], group->GTK_len) < 0)
2666 		ret = -1;
2667 
2668 #ifdef CONFIG_IEEE80211W
2669 	if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2670 		enum wpa_alg alg;
2671 		size_t len;
2672 
2673 		alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
2674 		len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2675 
2676 		if (ret == 0 &&
2677 		    wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
2678 				     broadcast_ether_addr, group->GN_igtk,
2679 				     group->IGTK[group->GN_igtk - 4], len) < 0)
2680 			ret = -1;
2681 	}
2682 #endif /* CONFIG_IEEE80211W */
2683 
2684 	return ret;
2685 }
2686 
2687 
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)2688 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
2689 {
2690 	if (sm->group == ctx) {
2691 		wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
2692 			   " for discconnection due to fatal failure",
2693 			   MAC2STR(sm->addr));
2694 		sm->Disconnect = TRUE;
2695 	}
2696 
2697 	return 0;
2698 }
2699 
2700 
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2701 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
2702 				    struct wpa_group *group)
2703 {
2704 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
2705 	group->changed = TRUE;
2706 	group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
2707 	wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
2708 }
2709 
2710 
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2711 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2712 				 struct wpa_group *group)
2713 {
2714 	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2715 		   "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2716 	group->changed = TRUE;
2717 	group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2718 
2719 	if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
2720 		wpa_group_fatal_failure(wpa_auth, group);
2721 		return -1;
2722 	}
2723 
2724 	return 0;
2725 }
2726 
2727 
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2728 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2729 			      struct wpa_group *group)
2730 {
2731 	if (group->GInit) {
2732 		wpa_group_gtk_init(wpa_auth, group);
2733 	} else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
2734 		/* Do not allow group operations */
2735 	} else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2736 		   group->GTKAuthenticator) {
2737 		wpa_group_setkeysdone(wpa_auth, group);
2738 	} else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2739 		   group->GTKReKey) {
2740 		wpa_group_setkeys(wpa_auth, group);
2741 	} else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2742 		if (group->GKeyDoneStations == 0)
2743 			wpa_group_setkeysdone(wpa_auth, group);
2744 		else if (group->GTKReKey)
2745 			wpa_group_setkeys(wpa_auth, group);
2746 	}
2747 }
2748 
2749 
wpa_sm_step(struct wpa_state_machine * sm)2750 static int wpa_sm_step(struct wpa_state_machine *sm)
2751 {
2752 	if (sm == NULL)
2753 		return 0;
2754 
2755 	if (sm->in_step_loop) {
2756 		/* This should not happen, but if it does, make sure we do not
2757 		 * end up freeing the state machine too early by exiting the
2758 		 * recursive call. */
2759 		wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2760 		return 0;
2761 	}
2762 
2763 	sm->in_step_loop = 1;
2764 	do {
2765 		if (sm->pending_deinit)
2766 			break;
2767 
2768 		sm->changed = FALSE;
2769 		sm->wpa_auth->group->changed = FALSE;
2770 
2771 		SM_STEP_RUN(WPA_PTK);
2772 		if (sm->pending_deinit)
2773 			break;
2774 		SM_STEP_RUN(WPA_PTK_GROUP);
2775 		if (sm->pending_deinit)
2776 			break;
2777 		wpa_group_sm_step(sm->wpa_auth, sm->group);
2778 	} while (sm->changed || sm->wpa_auth->group->changed);
2779 	sm->in_step_loop = 0;
2780 
2781 	if (sm->pending_deinit) {
2782 		wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2783 			   "machine deinit for " MACSTR, MAC2STR(sm->addr));
2784 		wpa_free_sta_sm(sm);
2785 		return 1;
2786 	}
2787 	return 0;
2788 }
2789 
2790 
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)2791 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2792 {
2793 	struct wpa_state_machine *sm = eloop_ctx;
2794 	wpa_sm_step(sm);
2795 }
2796 
2797 
wpa_auth_sm_notify(struct wpa_state_machine * sm)2798 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2799 {
2800 	if (sm == NULL)
2801 		return;
2802 	eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2803 }
2804 
2805 
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)2806 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2807 {
2808 	int tmp, i;
2809 	struct wpa_group *group;
2810 
2811 	if (wpa_auth == NULL)
2812 		return;
2813 
2814 	group = wpa_auth->group;
2815 
2816 	for (i = 0; i < 2; i++) {
2817 		tmp = group->GM;
2818 		group->GM = group->GN;
2819 		group->GN = tmp;
2820 #ifdef CONFIG_IEEE80211W
2821 		tmp = group->GM_igtk;
2822 		group->GM_igtk = group->GN_igtk;
2823 		group->GN_igtk = tmp;
2824 #endif /* CONFIG_IEEE80211W */
2825 		wpa_gtk_update(wpa_auth, group);
2826 		wpa_group_config_group_keys(wpa_auth, group);
2827 	}
2828 }
2829 
2830 
wpa_bool_txt(int bool)2831 static const char * wpa_bool_txt(int bool)
2832 {
2833 	return bool ? "TRUE" : "FALSE";
2834 }
2835 
2836 
2837 #define RSN_SUITE "%02x-%02x-%02x-%d"
2838 #define RSN_SUITE_ARG(s) \
2839 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2840 
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)2841 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2842 {
2843 	int len = 0, ret;
2844 	char pmkid_txt[PMKID_LEN * 2 + 1];
2845 #ifdef CONFIG_RSN_PREAUTH
2846 	const int preauth = 1;
2847 #else /* CONFIG_RSN_PREAUTH */
2848 	const int preauth = 0;
2849 #endif /* CONFIG_RSN_PREAUTH */
2850 
2851 	if (wpa_auth == NULL)
2852 		return len;
2853 
2854 	ret = os_snprintf(buf + len, buflen - len,
2855 			  "dot11RSNAOptionImplemented=TRUE\n"
2856 			  "dot11RSNAPreauthenticationImplemented=%s\n"
2857 			  "dot11RSNAEnabled=%s\n"
2858 			  "dot11RSNAPreauthenticationEnabled=%s\n",
2859 			  wpa_bool_txt(preauth),
2860 			  wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2861 			  wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2862 	if (ret < 0 || (size_t) ret >= buflen - len)
2863 		return len;
2864 	len += ret;
2865 
2866 	wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2867 			 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2868 
2869 	ret = os_snprintf(
2870 		buf + len, buflen - len,
2871 		"dot11RSNAConfigVersion=%u\n"
2872 		"dot11RSNAConfigPairwiseKeysSupported=9999\n"
2873 		/* FIX: dot11RSNAConfigGroupCipher */
2874 		/* FIX: dot11RSNAConfigGroupRekeyMethod */
2875 		/* FIX: dot11RSNAConfigGroupRekeyTime */
2876 		/* FIX: dot11RSNAConfigGroupRekeyPackets */
2877 		"dot11RSNAConfigGroupRekeyStrict=%u\n"
2878 		"dot11RSNAConfigGroupUpdateCount=%u\n"
2879 		"dot11RSNAConfigPairwiseUpdateCount=%u\n"
2880 		"dot11RSNAConfigGroupCipherSize=%u\n"
2881 		"dot11RSNAConfigPMKLifetime=%u\n"
2882 		"dot11RSNAConfigPMKReauthThreshold=%u\n"
2883 		"dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2884 		"dot11RSNAConfigSATimeout=%u\n"
2885 		"dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2886 		"dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2887 		"dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2888 		"dot11RSNAPMKIDUsed=%s\n"
2889 		"dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2890 		"dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2891 		"dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2892 		"dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2893 		"dot11RSNA4WayHandshakeFailures=%u\n"
2894 		"dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2895 		RSN_VERSION,
2896 		!!wpa_auth->conf.wpa_strict_rekey,
2897 		dot11RSNAConfigGroupUpdateCount,
2898 		dot11RSNAConfigPairwiseUpdateCount,
2899 		wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2900 		dot11RSNAConfigPMKLifetime,
2901 		dot11RSNAConfigPMKReauthThreshold,
2902 		dot11RSNAConfigSATimeout,
2903 		RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2904 		RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2905 		RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2906 		pmkid_txt,
2907 		RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2908 		RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2909 		RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2910 		wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2911 		wpa_auth->dot11RSNA4WayHandshakeFailures);
2912 	if (ret < 0 || (size_t) ret >= buflen - len)
2913 		return len;
2914 	len += ret;
2915 
2916 	/* TODO: dot11RSNAConfigPairwiseCiphersTable */
2917 	/* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2918 
2919 	/* Private MIB */
2920 	ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2921 			  wpa_auth->group->wpa_group_state);
2922 	if (ret < 0 || (size_t) ret >= buflen - len)
2923 		return len;
2924 	len += ret;
2925 
2926 	return len;
2927 }
2928 
2929 
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)2930 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2931 {
2932 	int len = 0, ret;
2933 	u32 pairwise = 0;
2934 
2935 	if (sm == NULL)
2936 		return 0;
2937 
2938 	/* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2939 
2940 	/* dot11RSNAStatsEntry */
2941 
2942 	pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2943 				       WPA_PROTO_RSN : WPA_PROTO_WPA,
2944 				       sm->pairwise);
2945 	if (pairwise == 0)
2946 		return 0;
2947 
2948 	ret = os_snprintf(
2949 		buf + len, buflen - len,
2950 		/* TODO: dot11RSNAStatsIndex */
2951 		"dot11RSNAStatsSTAAddress=" MACSTR "\n"
2952 		"dot11RSNAStatsVersion=1\n"
2953 		"dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2954 		/* TODO: dot11RSNAStatsTKIPICVErrors */
2955 		"dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2956 		"dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2957 		/* TODO: dot11RSNAStatsCCMPReplays */
2958 		/* TODO: dot11RSNAStatsCCMPDecryptErrors */
2959 		/* TODO: dot11RSNAStatsTKIPReplays */,
2960 		MAC2STR(sm->addr),
2961 		RSN_SUITE_ARG(pairwise),
2962 		sm->dot11RSNAStatsTKIPLocalMICFailures,
2963 		sm->dot11RSNAStatsTKIPRemoteMICFailures);
2964 	if (ret < 0 || (size_t) ret >= buflen - len)
2965 		return len;
2966 	len += ret;
2967 
2968 	/* Private MIB */
2969 	ret = os_snprintf(buf + len, buflen - len,
2970 			  "hostapdWPAPTKState=%d\n"
2971 			  "hostapdWPAPTKGroupState=%d\n",
2972 			  sm->wpa_ptk_state,
2973 			  sm->wpa_ptk_group_state);
2974 	if (ret < 0 || (size_t) ret >= buflen - len)
2975 		return len;
2976 	len += ret;
2977 
2978 	return len;
2979 }
2980 
2981 
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)2982 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2983 {
2984 	if (wpa_auth)
2985 		wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2986 }
2987 
2988 
wpa_auth_pairwise_set(struct wpa_state_machine * sm)2989 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2990 {
2991 	return sm && sm->pairwise_set;
2992 }
2993 
2994 
wpa_auth_get_pairwise(struct wpa_state_machine * sm)2995 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2996 {
2997 	return sm->pairwise;
2998 }
2999 
3000 
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)3001 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3002 {
3003 	if (sm == NULL)
3004 		return -1;
3005 	return sm->wpa_key_mgmt;
3006 }
3007 
3008 
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)3009 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3010 {
3011 	if (sm == NULL)
3012 		return 0;
3013 	return sm->wpa;
3014 }
3015 
3016 
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)3017 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3018 			     struct rsn_pmksa_cache_entry *entry)
3019 {
3020 	if (sm == NULL || sm->pmksa != entry)
3021 		return -1;
3022 	sm->pmksa = NULL;
3023 	return 0;
3024 }
3025 
3026 
3027 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)3028 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3029 {
3030 	return sm ? sm->pmksa : NULL;
3031 }
3032 
3033 
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)3034 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3035 {
3036 	if (sm)
3037 		sm->dot11RSNAStatsTKIPLocalMICFailures++;
3038 }
3039 
3040 
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)3041 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3042 {
3043 	if (wpa_auth == NULL)
3044 		return NULL;
3045 	*len = wpa_auth->wpa_ie_len;
3046 	return wpa_auth->wpa_ie;
3047 }
3048 
3049 
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,int session_timeout,struct eapol_state_machine * eapol)3050 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3051 		       int session_timeout, struct eapol_state_machine *eapol)
3052 {
3053 	if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3054 	    sm->wpa_auth->conf.disable_pmksa_caching)
3055 		return -1;
3056 
3057 	if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
3058 				 sm->wpa_auth->addr, sm->addr, session_timeout,
3059 				 eapol, sm->wpa_key_mgmt))
3060 		return 0;
3061 
3062 	return -1;
3063 }
3064 
3065 
wpa_auth_pmksa_add_preauth(struct wpa_authenticator * wpa_auth,const u8 * pmk,size_t len,const u8 * sta_addr,int session_timeout,struct eapol_state_machine * eapol)3066 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3067 			       const u8 *pmk, size_t len, const u8 *sta_addr,
3068 			       int session_timeout,
3069 			       struct eapol_state_machine *eapol)
3070 {
3071 	if (wpa_auth == NULL)
3072 		return -1;
3073 
3074 	if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
3075 				 sta_addr, session_timeout, eapol,
3076 				 WPA_KEY_MGMT_IEEE8021X))
3077 		return 0;
3078 
3079 	return -1;
3080 }
3081 
3082 
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)3083 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3084 			   const u8 *sta_addr)
3085 {
3086 	struct rsn_pmksa_cache_entry *pmksa;
3087 
3088 	if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3089 		return;
3090 	pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3091 	if (pmksa) {
3092 		wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3093 			   MACSTR " based on request", MAC2STR(sta_addr));
3094 		pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3095 	}
3096 }
3097 
3098 
3099 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)3100 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3101 {
3102 	struct wpa_group *group;
3103 
3104 	if (wpa_auth == NULL || wpa_auth->group == NULL)
3105 		return NULL;
3106 
3107 	wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3108 		   vlan_id);
3109 	group = wpa_group_init(wpa_auth, vlan_id, 0);
3110 	if (group == NULL)
3111 		return NULL;
3112 
3113 	group->next = wpa_auth->group->next;
3114 	wpa_auth->group->next = group;
3115 
3116 	return group;
3117 }
3118 
3119 
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)3120 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3121 {
3122 	struct wpa_group *group;
3123 
3124 	if (sm == NULL || sm->wpa_auth == NULL)
3125 		return 0;
3126 
3127 	group = sm->wpa_auth->group;
3128 	while (group) {
3129 		if (group->vlan_id == vlan_id)
3130 			break;
3131 		group = group->next;
3132 	}
3133 
3134 	if (group == NULL) {
3135 		group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3136 		if (group == NULL)
3137 			return -1;
3138 	}
3139 
3140 	if (sm->group == group)
3141 		return 0;
3142 
3143 	if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3144 		return -1;
3145 
3146 	wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3147 		   "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3148 
3149 	sm->group = group;
3150 	return 0;
3151 }
3152 
3153 
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)3154 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3155 				  struct wpa_state_machine *sm, int ack)
3156 {
3157 	if (wpa_auth == NULL || sm == NULL)
3158 		return;
3159 	wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3160 		   " ack=%d", MAC2STR(sm->addr), ack);
3161 	if (sm->pending_1_of_4_timeout && ack) {
3162 		/*
3163 		 * Some deployed supplicant implementations update their SNonce
3164 		 * for each EAPOL-Key 2/4 message even within the same 4-way
3165 		 * handshake and then fail to use the first SNonce when
3166 		 * deriving the PTK. This results in unsuccessful 4-way
3167 		 * handshake whenever the relatively short initial timeout is
3168 		 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3169 		 * around this by increasing the timeout now that we know that
3170 		 * the station has received the frame.
3171 		 */
3172 		int timeout_ms = eapol_key_timeout_subseq;
3173 		wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3174 			   "timeout by %u ms because of acknowledged frame",
3175 			   timeout_ms);
3176 		eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3177 		eloop_register_timeout(timeout_ms / 1000,
3178 				       (timeout_ms % 1000) * 1000,
3179 				       wpa_send_eapol_timeout, wpa_auth, sm);
3180 	}
3181 }
3182 
3183 
wpa_auth_uses_sae(struct wpa_state_machine * sm)3184 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3185 {
3186 	if (sm == NULL)
3187 		return 0;
3188 	return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3189 }
3190 
3191 
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)3192 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3193 {
3194 	if (sm == NULL)
3195 		return 0;
3196 	return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3197 }
3198 
3199 
3200 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)3201 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3202 {
3203 	if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3204 		return -1;
3205 	os_memcpy(addr, sm->ip_addr, 4);
3206 	return 0;
3207 }
3208 #endif /* CONFIG_P2P */
3209