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