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[thirdparty/hostap.git] / src / ap / wpa_auth.c
1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/state_machine.h"
14 #include "utils/bitfield.h"
15 #include "common/ieee802_11_defs.h"
16 #include "crypto/aes.h"
17 #include "crypto/aes_wrap.h"
18 #include "crypto/aes_siv.h"
19 #include "crypto/crypto.h"
20 #include "crypto/sha1.h"
21 #include "crypto/sha256.h"
22 #include "crypto/random.h"
23 #include "eapol_auth/eapol_auth_sm.h"
24 #include "ap_config.h"
25 #include "ieee802_11.h"
26 #include "wpa_auth.h"
27 #include "pmksa_cache_auth.h"
28 #include "wpa_auth_i.h"
29 #include "wpa_auth_ie.h"
30
31 #define STATE_MACHINE_DATA struct wpa_state_machine
32 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
33 #define STATE_MACHINE_ADDR sm->addr
34
35
36 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
37 static int wpa_sm_step(struct wpa_state_machine *sm);
38 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
39 size_t data_len);
40 #ifdef CONFIG_FILS
41 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
42 u8 *buf, size_t buf_len, u16 *_key_data_len);
43 #endif /* CONFIG_FILS */
44 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
45 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
46 struct wpa_group *group);
47 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
48 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
49 struct wpa_group *group);
50 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
51 struct wpa_group *group);
52 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
53 const u8 *pmk, unsigned int pmk_len,
54 struct wpa_ptk *ptk);
55 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
56 struct wpa_group *group);
57 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
58 struct wpa_group *group);
59 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
60 struct wpa_group *group);
61 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos);
62
63 static const u32 eapol_key_timeout_first = 100; /* ms */
64 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
65 static const u32 eapol_key_timeout_first_group = 500; /* ms */
66
67 /* TODO: make these configurable */
68 static const int dot11RSNAConfigPMKLifetime = 43200;
69 static const int dot11RSNAConfigPMKReauthThreshold = 70;
70 static const int dot11RSNAConfigSATimeout = 60;
71
72
73 static inline int wpa_auth_mic_failure_report(
74 struct wpa_authenticator *wpa_auth, const u8 *addr)
75 {
76 if (wpa_auth->cb->mic_failure_report)
77 return wpa_auth->cb->mic_failure_report(wpa_auth->cb_ctx, addr);
78 return 0;
79 }
80
81
82 static inline void wpa_auth_psk_failure_report(
83 struct wpa_authenticator *wpa_auth, const u8 *addr)
84 {
85 if (wpa_auth->cb->psk_failure_report)
86 wpa_auth->cb->psk_failure_report(wpa_auth->cb_ctx, addr);
87 }
88
89
90 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
91 const u8 *addr, wpa_eapol_variable var,
92 int value)
93 {
94 if (wpa_auth->cb->set_eapol)
95 wpa_auth->cb->set_eapol(wpa_auth->cb_ctx, addr, var, value);
96 }
97
98
99 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
100 const u8 *addr, wpa_eapol_variable var)
101 {
102 if (wpa_auth->cb->get_eapol == NULL)
103 return -1;
104 return wpa_auth->cb->get_eapol(wpa_auth->cb_ctx, addr, var);
105 }
106
107
108 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
109 const u8 *addr,
110 const u8 *p2p_dev_addr,
111 const u8 *prev_psk)
112 {
113 if (wpa_auth->cb->get_psk == NULL)
114 return NULL;
115 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
116 prev_psk);
117 }
118
119
120 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
121 const u8 *addr, u8 *msk, size_t *len)
122 {
123 if (wpa_auth->cb->get_msk == NULL)
124 return -1;
125 return wpa_auth->cb->get_msk(wpa_auth->cb_ctx, addr, msk, len);
126 }
127
128
129 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
130 int vlan_id,
131 enum wpa_alg alg, const u8 *addr, int idx,
132 u8 *key, size_t key_len)
133 {
134 if (wpa_auth->cb->set_key == NULL)
135 return -1;
136 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
137 key, key_len);
138 }
139
140
141 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
142 const u8 *addr, int idx, u8 *seq)
143 {
144 if (wpa_auth->cb->get_seqnum == NULL)
145 return -1;
146 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
147 }
148
149
150 static inline int
151 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
152 const u8 *data, size_t data_len, int encrypt)
153 {
154 if (wpa_auth->cb->send_eapol == NULL)
155 return -1;
156 return wpa_auth->cb->send_eapol(wpa_auth->cb_ctx, addr, data, data_len,
157 encrypt);
158 }
159
160
161 #ifdef CONFIG_MESH
162 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
163 const u8 *addr)
164 {
165 if (wpa_auth->cb->start_ampe == NULL)
166 return -1;
167 return wpa_auth->cb->start_ampe(wpa_auth->cb_ctx, addr);
168 }
169 #endif /* CONFIG_MESH */
170
171
172 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
173 int (*cb)(struct wpa_state_machine *sm, void *ctx),
174 void *cb_ctx)
175 {
176 if (wpa_auth->cb->for_each_sta == NULL)
177 return 0;
178 return wpa_auth->cb->for_each_sta(wpa_auth->cb_ctx, cb, cb_ctx);
179 }
180
181
182 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
183 int (*cb)(struct wpa_authenticator *a, void *ctx),
184 void *cb_ctx)
185 {
186 if (wpa_auth->cb->for_each_auth == NULL)
187 return 0;
188 return wpa_auth->cb->for_each_auth(wpa_auth->cb_ctx, cb, cb_ctx);
189 }
190
191
192 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
193 logger_level level, const char *txt)
194 {
195 if (wpa_auth->cb->logger == NULL)
196 return;
197 wpa_auth->cb->logger(wpa_auth->cb_ctx, addr, level, txt);
198 }
199
200
201 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
202 logger_level level, const char *fmt, ...)
203 {
204 char *format;
205 int maxlen;
206 va_list ap;
207
208 if (wpa_auth->cb->logger == NULL)
209 return;
210
211 maxlen = os_strlen(fmt) + 100;
212 format = os_malloc(maxlen);
213 if (!format)
214 return;
215
216 va_start(ap, fmt);
217 vsnprintf(format, maxlen, fmt, ap);
218 va_end(ap);
219
220 wpa_auth_logger(wpa_auth, addr, level, format);
221
222 os_free(format);
223 }
224
225
226 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
227 const u8 *addr)
228 {
229 if (wpa_auth->cb->disconnect == NULL)
230 return;
231 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
232 wpa_auth->cb->disconnect(wpa_auth->cb_ctx, addr,
233 WLAN_REASON_PREV_AUTH_NOT_VALID);
234 }
235
236
237 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
238 {
239 int ret = 0;
240 #ifdef CONFIG_IEEE80211R_AP
241 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
242 ret = 1;
243 #endif /* CONFIG_IEEE80211R_AP */
244 #ifdef CONFIG_IEEE80211W
245 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
246 ret = 1;
247 #endif /* CONFIG_IEEE80211W */
248 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
249 ret = 1;
250 return ret;
251 }
252
253
254 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
255 {
256 struct wpa_authenticator *wpa_auth = eloop_ctx;
257
258 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
259 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
260 "initialization.");
261 } else {
262 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
263 wpa_hexdump_key(MSG_DEBUG, "GMK",
264 wpa_auth->group->GMK, WPA_GMK_LEN);
265 }
266
267 if (wpa_auth->conf.wpa_gmk_rekey) {
268 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
269 wpa_rekey_gmk, wpa_auth, NULL);
270 }
271 }
272
273
274 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
275 {
276 struct wpa_authenticator *wpa_auth = eloop_ctx;
277 struct wpa_group *group, *next;
278
279 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
280 group = wpa_auth->group;
281 while (group) {
282 wpa_group_get(wpa_auth, group);
283
284 group->GTKReKey = TRUE;
285 do {
286 group->changed = FALSE;
287 wpa_group_sm_step(wpa_auth, group);
288 } while (group->changed);
289
290 next = group->next;
291 wpa_group_put(wpa_auth, group);
292 group = next;
293 }
294
295 if (wpa_auth->conf.wpa_group_rekey) {
296 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
297 0, wpa_rekey_gtk, wpa_auth, NULL);
298 }
299 }
300
301
302 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
303 {
304 struct wpa_authenticator *wpa_auth = eloop_ctx;
305 struct wpa_state_machine *sm = timeout_ctx;
306
307 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
308 wpa_request_new_ptk(sm);
309 wpa_sm_step(sm);
310 }
311
312
313 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
314 {
315 if (sm->pmksa == ctx)
316 sm->pmksa = NULL;
317 return 0;
318 }
319
320
321 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
322 void *ctx)
323 {
324 struct wpa_authenticator *wpa_auth = ctx;
325 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
326 }
327
328
329 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
330 struct wpa_group *group)
331 {
332 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
333 u8 rkey[32];
334 unsigned long ptr;
335
336 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
337 return -1;
338 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
339
340 /*
341 * Counter = PRF-256(Random number, "Init Counter",
342 * Local MAC Address || Time)
343 */
344 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
345 wpa_get_ntp_timestamp(buf + ETH_ALEN);
346 ptr = (unsigned long) group;
347 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
348 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
349 return -1;
350
351 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
352 group->Counter, WPA_NONCE_LEN) < 0)
353 return -1;
354 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
355 group->Counter, WPA_NONCE_LEN);
356
357 return 0;
358 }
359
360
361 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
362 int vlan_id, int delay_init)
363 {
364 struct wpa_group *group;
365
366 group = os_zalloc(sizeof(struct wpa_group));
367 if (group == NULL)
368 return NULL;
369
370 group->GTKAuthenticator = TRUE;
371 group->vlan_id = vlan_id;
372 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
373
374 if (random_pool_ready() != 1) {
375 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
376 "for secure operations - update keys later when "
377 "the first station connects");
378 }
379
380 /*
381 * Set initial GMK/Counter value here. The actual values that will be
382 * used in negotiations will be set once the first station tries to
383 * connect. This allows more time for collecting additional randomness
384 * on embedded devices.
385 */
386 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
387 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
388 "initialization.");
389 os_free(group);
390 return NULL;
391 }
392
393 group->GInit = TRUE;
394 if (delay_init) {
395 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
396 "until Beacon frames have been configured");
397 /* Initialization is completed in wpa_init_keys(). */
398 } else {
399 wpa_group_sm_step(wpa_auth, group);
400 group->GInit = FALSE;
401 wpa_group_sm_step(wpa_auth, group);
402 }
403
404 return group;
405 }
406
407
408 /**
409 * wpa_init - Initialize WPA authenticator
410 * @addr: Authenticator address
411 * @conf: Configuration for WPA authenticator
412 * @cb: Callback functions for WPA authenticator
413 * Returns: Pointer to WPA authenticator data or %NULL on failure
414 */
415 struct wpa_authenticator * wpa_init(const u8 *addr,
416 struct wpa_auth_config *conf,
417 const struct wpa_auth_callbacks *cb,
418 void *cb_ctx)
419 {
420 struct wpa_authenticator *wpa_auth;
421
422 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
423 if (wpa_auth == NULL)
424 return NULL;
425 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
426 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
427 wpa_auth->cb = cb;
428 wpa_auth->cb_ctx = cb_ctx;
429
430 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
431 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
432 os_free(wpa_auth);
433 return NULL;
434 }
435
436 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
437 if (wpa_auth->group == NULL) {
438 os_free(wpa_auth->wpa_ie);
439 os_free(wpa_auth);
440 return NULL;
441 }
442
443 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
444 wpa_auth);
445 if (wpa_auth->pmksa == NULL) {
446 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
447 os_free(wpa_auth->group);
448 os_free(wpa_auth->wpa_ie);
449 os_free(wpa_auth);
450 return NULL;
451 }
452
453 #ifdef CONFIG_IEEE80211R_AP
454 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
455 if (wpa_auth->ft_pmk_cache == NULL) {
456 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
457 os_free(wpa_auth->group);
458 os_free(wpa_auth->wpa_ie);
459 pmksa_cache_auth_deinit(wpa_auth->pmksa);
460 os_free(wpa_auth);
461 return NULL;
462 }
463 #endif /* CONFIG_IEEE80211R_AP */
464
465 if (wpa_auth->conf.wpa_gmk_rekey) {
466 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
467 wpa_rekey_gmk, wpa_auth, NULL);
468 }
469
470 if (wpa_auth->conf.wpa_group_rekey) {
471 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
472 wpa_rekey_gtk, wpa_auth, NULL);
473 }
474
475 #ifdef CONFIG_P2P
476 if (WPA_GET_BE32(conf->ip_addr_start)) {
477 int count = WPA_GET_BE32(conf->ip_addr_end) -
478 WPA_GET_BE32(conf->ip_addr_start) + 1;
479 if (count > 1000)
480 count = 1000;
481 if (count > 0)
482 wpa_auth->ip_pool = bitfield_alloc(count);
483 }
484 #endif /* CONFIG_P2P */
485
486 return wpa_auth;
487 }
488
489
490 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
491 {
492 struct wpa_group *group = wpa_auth->group;
493
494 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
495 "keys");
496 wpa_group_sm_step(wpa_auth, group);
497 group->GInit = FALSE;
498 wpa_group_sm_step(wpa_auth, group);
499 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
500 return -1;
501 return 0;
502 }
503
504
505 /**
506 * wpa_deinit - Deinitialize WPA authenticator
507 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
508 */
509 void wpa_deinit(struct wpa_authenticator *wpa_auth)
510 {
511 struct wpa_group *group, *prev;
512
513 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
514 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
515
516 pmksa_cache_auth_deinit(wpa_auth->pmksa);
517
518 #ifdef CONFIG_IEEE80211R_AP
519 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
520 wpa_auth->ft_pmk_cache = NULL;
521 #endif /* CONFIG_IEEE80211R_AP */
522
523 #ifdef CONFIG_P2P
524 bitfield_free(wpa_auth->ip_pool);
525 #endif /* CONFIG_P2P */
526
527
528 os_free(wpa_auth->wpa_ie);
529
530 group = wpa_auth->group;
531 while (group) {
532 prev = group;
533 group = group->next;
534 os_free(prev);
535 }
536
537 os_free(wpa_auth);
538 }
539
540
541 /**
542 * wpa_reconfig - Update WPA authenticator configuration
543 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
544 * @conf: Configuration for WPA authenticator
545 */
546 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
547 struct wpa_auth_config *conf)
548 {
549 struct wpa_group *group;
550 if (wpa_auth == NULL)
551 return 0;
552
553 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
554 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
555 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
556 return -1;
557 }
558
559 /*
560 * Reinitialize GTK to make sure it is suitable for the new
561 * configuration.
562 */
563 group = wpa_auth->group;
564 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
565 group->GInit = TRUE;
566 wpa_group_sm_step(wpa_auth, group);
567 group->GInit = FALSE;
568 wpa_group_sm_step(wpa_auth, group);
569
570 return 0;
571 }
572
573
574 struct wpa_state_machine *
575 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
576 const u8 *p2p_dev_addr)
577 {
578 struct wpa_state_machine *sm;
579
580 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
581 return NULL;
582
583 sm = os_zalloc(sizeof(struct wpa_state_machine));
584 if (sm == NULL)
585 return NULL;
586 os_memcpy(sm->addr, addr, ETH_ALEN);
587 if (p2p_dev_addr)
588 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
589
590 sm->wpa_auth = wpa_auth;
591 sm->group = wpa_auth->group;
592 wpa_group_get(sm->wpa_auth, sm->group);
593
594 return sm;
595 }
596
597
598 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
599 struct wpa_state_machine *sm)
600 {
601 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
602 return -1;
603
604 #ifdef CONFIG_IEEE80211R_AP
605 if (sm->ft_completed) {
606 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
607 "FT authentication already completed - do not "
608 "start 4-way handshake");
609 /* Go to PTKINITDONE state to allow GTK rekeying */
610 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
611 sm->Pair = TRUE;
612 return 0;
613 }
614 #endif /* CONFIG_IEEE80211R_AP */
615
616 #ifdef CONFIG_FILS
617 if (sm->fils_completed) {
618 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
619 "FILS authentication already completed - do not start 4-way handshake");
620 /* Go to PTKINITDONE state to allow GTK rekeying */
621 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
622 sm->Pair = TRUE;
623 return 0;
624 }
625 #endif /* CONFIG_FILS */
626
627 if (sm->started) {
628 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
629 sm->ReAuthenticationRequest = TRUE;
630 return wpa_sm_step(sm);
631 }
632
633 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
634 "start authentication");
635 sm->started = 1;
636
637 sm->Init = TRUE;
638 if (wpa_sm_step(sm) == 1)
639 return 1; /* should not really happen */
640 sm->Init = FALSE;
641 sm->AuthenticationRequest = TRUE;
642 return wpa_sm_step(sm);
643 }
644
645
646 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
647 {
648 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
649 * reassociates back to the same AP while the previous entry for the
650 * STA has not yet been removed. */
651 if (sm == NULL)
652 return;
653
654 sm->wpa_key_mgmt = 0;
655 }
656
657
658 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
659 {
660 #ifdef CONFIG_P2P
661 if (WPA_GET_BE32(sm->ip_addr)) {
662 u32 start;
663 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
664 "address %u.%u.%u.%u from " MACSTR,
665 sm->ip_addr[0], sm->ip_addr[1],
666 sm->ip_addr[2], sm->ip_addr[3],
667 MAC2STR(sm->addr));
668 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
669 bitfield_clear(sm->wpa_auth->ip_pool,
670 WPA_GET_BE32(sm->ip_addr) - start);
671 }
672 #endif /* CONFIG_P2P */
673 if (sm->GUpdateStationKeys) {
674 sm->group->GKeyDoneStations--;
675 sm->GUpdateStationKeys = FALSE;
676 }
677 #ifdef CONFIG_IEEE80211R_AP
678 os_free(sm->assoc_resp_ftie);
679 wpabuf_free(sm->ft_pending_req_ies);
680 #endif /* CONFIG_IEEE80211R_AP */
681 os_free(sm->last_rx_eapol_key);
682 os_free(sm->wpa_ie);
683 wpa_group_put(sm->wpa_auth, sm->group);
684 os_free(sm);
685 }
686
687
688 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
689 {
690 if (sm == NULL)
691 return;
692
693 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
694 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
695 "strict rekeying - force GTK rekey since STA "
696 "is leaving");
697 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
698 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
699 NULL);
700 }
701
702 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
703 sm->pending_1_of_4_timeout = 0;
704 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
705 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
706 if (sm->in_step_loop) {
707 /* Must not free state machine while wpa_sm_step() is running.
708 * Freeing will be completed in the end of wpa_sm_step(). */
709 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
710 "machine deinit for " MACSTR, MAC2STR(sm->addr));
711 sm->pending_deinit = 1;
712 } else
713 wpa_free_sta_sm(sm);
714 }
715
716
717 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
718 {
719 if (sm == NULL)
720 return;
721
722 sm->PTKRequest = TRUE;
723 sm->PTK_valid = 0;
724 }
725
726
727 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
728 const u8 *replay_counter)
729 {
730 int i;
731 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
732 if (!ctr[i].valid)
733 break;
734 if (os_memcmp(replay_counter, ctr[i].counter,
735 WPA_REPLAY_COUNTER_LEN) == 0)
736 return 1;
737 }
738 return 0;
739 }
740
741
742 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
743 const u8 *replay_counter)
744 {
745 int i;
746 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
747 if (ctr[i].valid &&
748 (replay_counter == NULL ||
749 os_memcmp(replay_counter, ctr[i].counter,
750 WPA_REPLAY_COUNTER_LEN) == 0))
751 ctr[i].valid = FALSE;
752 }
753 }
754
755
756 #ifdef CONFIG_IEEE80211R_AP
757 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
758 struct wpa_state_machine *sm,
759 struct wpa_eapol_ie_parse *kde)
760 {
761 struct wpa_ie_data ie;
762 struct rsn_mdie *mdie;
763
764 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
765 ie.num_pmkid != 1 || ie.pmkid == NULL) {
766 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
767 "FT 4-way handshake message 2/4");
768 return -1;
769 }
770
771 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
772 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
773 sm->sup_pmk_r1_name, PMKID_LEN);
774
775 if (!kde->mdie || !kde->ftie) {
776 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
777 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
778 return -1;
779 }
780
781 mdie = (struct rsn_mdie *) (kde->mdie + 2);
782 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
783 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
784 MOBILITY_DOMAIN_ID_LEN) != 0) {
785 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
786 return -1;
787 }
788
789 if (sm->assoc_resp_ftie &&
790 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
791 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
792 2 + sm->assoc_resp_ftie[1]) != 0)) {
793 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
794 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
795 kde->ftie, kde->ftie_len);
796 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
797 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
798 return -1;
799 }
800
801 return 0;
802 }
803 #endif /* CONFIG_IEEE80211R_AP */
804
805
806 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
807 struct wpa_state_machine *sm, int group)
808 {
809 /* Supplicant reported a Michael MIC error */
810 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
811 "received EAPOL-Key Error Request "
812 "(STA detected Michael MIC failure (group=%d))",
813 group);
814
815 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
816 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
817 "ignore Michael MIC failure report since "
818 "group cipher is not TKIP");
819 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
820 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
821 "ignore Michael MIC failure report since "
822 "pairwise cipher is not TKIP");
823 } else {
824 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
825 return 1; /* STA entry was removed */
826 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
827 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
828 }
829
830 /*
831 * Error report is not a request for a new key handshake, but since
832 * Authenticator may do it, let's change the keys now anyway.
833 */
834 wpa_request_new_ptk(sm);
835 return 0;
836 }
837
838
839 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
840 size_t data_len)
841 {
842 struct wpa_ptk PTK;
843 int ok = 0;
844 const u8 *pmk = NULL;
845 unsigned int pmk_len;
846
847 os_memset(&PTK, 0, sizeof(PTK));
848 for (;;) {
849 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
850 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
851 sm->p2p_dev_addr, pmk);
852 if (pmk == NULL)
853 break;
854 pmk_len = PMK_LEN;
855 } else {
856 pmk = sm->PMK;
857 pmk_len = sm->pmk_len;
858 }
859
860 if (wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK) < 0)
861 break;
862
863 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
864 == 0) {
865 ok = 1;
866 break;
867 }
868
869 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
870 break;
871 }
872
873 if (!ok) {
874 wpa_printf(MSG_DEBUG,
875 "WPA: Earlier SNonce did not result in matching MIC");
876 return -1;
877 }
878
879 wpa_printf(MSG_DEBUG,
880 "WPA: Earlier SNonce resulted in matching MIC");
881 sm->alt_snonce_valid = 0;
882 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
883 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
884 sm->PTK_valid = TRUE;
885
886 return 0;
887 }
888
889
890 void wpa_receive(struct wpa_authenticator *wpa_auth,
891 struct wpa_state_machine *sm,
892 u8 *data, size_t data_len)
893 {
894 struct ieee802_1x_hdr *hdr;
895 struct wpa_eapol_key *key;
896 u16 key_info, key_data_length;
897 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
898 SMK_M1, SMK_M3, SMK_ERROR } msg;
899 char *msgtxt;
900 struct wpa_eapol_ie_parse kde;
901 const u8 *key_data;
902 size_t keyhdrlen, mic_len;
903 u8 *mic;
904
905 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
906 return;
907 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
908
909 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
910 keyhdrlen = sizeof(*key) + mic_len + 2;
911
912 if (data_len < sizeof(*hdr) + keyhdrlen) {
913 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
914 return;
915 }
916
917 hdr = (struct ieee802_1x_hdr *) data;
918 key = (struct wpa_eapol_key *) (hdr + 1);
919 mic = (u8 *) (key + 1);
920 key_info = WPA_GET_BE16(key->key_info);
921 key_data = mic + mic_len + 2;
922 key_data_length = WPA_GET_BE16(mic + mic_len);
923 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
924 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
925 MAC2STR(sm->addr), key_info, key->type,
926 (unsigned int) mic_len, key_data_length);
927 wpa_hexdump(MSG_MSGDUMP,
928 "WPA: EAPOL-Key header (ending before Key MIC)",
929 key, sizeof(*key));
930 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
931 mic, mic_len);
932 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
933 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
934 "key_data overflow (%d > %lu)",
935 key_data_length,
936 (unsigned long) (data_len - sizeof(*hdr) -
937 keyhdrlen));
938 return;
939 }
940
941 if (sm->wpa == WPA_VERSION_WPA2) {
942 if (key->type == EAPOL_KEY_TYPE_WPA) {
943 /*
944 * Some deployed station implementations seem to send
945 * msg 4/4 with incorrect type value in WPA2 mode.
946 */
947 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
948 "with unexpected WPA type in RSN mode");
949 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
950 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
951 "unexpected type %d in RSN mode",
952 key->type);
953 return;
954 }
955 } else {
956 if (key->type != EAPOL_KEY_TYPE_WPA) {
957 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
958 "unexpected type %d in WPA mode",
959 key->type);
960 return;
961 }
962 }
963
964 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
965 WPA_NONCE_LEN);
966 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
967 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
968
969 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
970 * are set */
971
972 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
973 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
974 if (key_info & WPA_KEY_INFO_ERROR) {
975 msg = SMK_ERROR;
976 msgtxt = "SMK Error";
977 } else {
978 msg = SMK_M1;
979 msgtxt = "SMK M1";
980 }
981 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
982 msg = SMK_M3;
983 msgtxt = "SMK M3";
984 } else if (key_info & WPA_KEY_INFO_REQUEST) {
985 msg = REQUEST;
986 msgtxt = "Request";
987 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
988 msg = GROUP_2;
989 msgtxt = "2/2 Group";
990 } else if (key_data_length == 0 ||
991 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
992 key_data_length == AES_BLOCK_SIZE)) {
993 msg = PAIRWISE_4;
994 msgtxt = "4/4 Pairwise";
995 } else {
996 msg = PAIRWISE_2;
997 msgtxt = "2/4 Pairwise";
998 }
999
1000 /* TODO: key_info type validation for PeerKey */
1001 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
1002 msg == GROUP_2) {
1003 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1004 if (sm->pairwise == WPA_CIPHER_CCMP ||
1005 sm->pairwise == WPA_CIPHER_GCMP) {
1006 if (wpa_use_aes_cmac(sm) &&
1007 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
1008 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
1009 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1010 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1011 wpa_auth_logger(wpa_auth, sm->addr,
1012 LOGGER_WARNING,
1013 "advertised support for "
1014 "AES-128-CMAC, but did not "
1015 "use it");
1016 return;
1017 }
1018
1019 if (!wpa_use_aes_cmac(sm) &&
1020 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1021 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1022 wpa_auth_logger(wpa_auth, sm->addr,
1023 LOGGER_WARNING,
1024 "did not use HMAC-SHA1-AES "
1025 "with CCMP/GCMP");
1026 return;
1027 }
1028 }
1029
1030 if ((wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1031 wpa_key_mgmt_fils(sm->wpa_key_mgmt)) &&
1032 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1033 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1034 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1035 return;
1036 }
1037 }
1038
1039 if (key_info & WPA_KEY_INFO_REQUEST) {
1040 if (sm->req_replay_counter_used &&
1041 os_memcmp(key->replay_counter, sm->req_replay_counter,
1042 WPA_REPLAY_COUNTER_LEN) <= 0) {
1043 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1044 "received EAPOL-Key request with "
1045 "replayed counter");
1046 return;
1047 }
1048 }
1049
1050 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1051 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1052 int i;
1053
1054 if (msg == PAIRWISE_2 &&
1055 wpa_replay_counter_valid(sm->prev_key_replay,
1056 key->replay_counter) &&
1057 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1058 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1059 {
1060 /*
1061 * Some supplicant implementations (e.g., Windows XP
1062 * WZC) update SNonce for each EAPOL-Key 2/4. This
1063 * breaks the workaround on accepting any of the
1064 * pending requests, so allow the SNonce to be updated
1065 * even if we have already sent out EAPOL-Key 3/4.
1066 */
1067 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1068 "Process SNonce update from STA "
1069 "based on retransmitted EAPOL-Key "
1070 "1/4");
1071 sm->update_snonce = 1;
1072 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1073 sm->alt_snonce_valid = TRUE;
1074 os_memcpy(sm->alt_replay_counter,
1075 sm->key_replay[0].counter,
1076 WPA_REPLAY_COUNTER_LEN);
1077 goto continue_processing;
1078 }
1079
1080 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1081 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1082 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1083 WPA_REPLAY_COUNTER_LEN) == 0) {
1084 /*
1085 * Supplicant may still be using the old SNonce since
1086 * there was two EAPOL-Key 2/4 messages and they had
1087 * different SNonce values.
1088 */
1089 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1090 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1091 goto continue_processing;
1092 }
1093
1094 if (msg == PAIRWISE_2 &&
1095 wpa_replay_counter_valid(sm->prev_key_replay,
1096 key->replay_counter) &&
1097 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1098 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1099 "ignore retransmitted EAPOL-Key %s - "
1100 "SNonce did not change", msgtxt);
1101 } else {
1102 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1103 "received EAPOL-Key %s with "
1104 "unexpected replay counter", msgtxt);
1105 }
1106 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1107 if (!sm->key_replay[i].valid)
1108 break;
1109 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1110 sm->key_replay[i].counter,
1111 WPA_REPLAY_COUNTER_LEN);
1112 }
1113 wpa_hexdump(MSG_DEBUG, "received replay counter",
1114 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1115 return;
1116 }
1117
1118 continue_processing:
1119 #ifdef CONFIG_FILS
1120 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1121 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1122 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1123 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1124 return;
1125 }
1126 #endif /* CONFIG_FILS */
1127
1128 switch (msg) {
1129 case PAIRWISE_2:
1130 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1131 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1132 (!sm->update_snonce ||
1133 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1134 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1135 "received EAPOL-Key msg 2/4 in "
1136 "invalid state (%d) - dropped",
1137 sm->wpa_ptk_state);
1138 return;
1139 }
1140 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1141 if (sm->group->reject_4way_hs_for_entropy) {
1142 /*
1143 * The system did not have enough entropy to generate
1144 * strong random numbers. Reject the first 4-way
1145 * handshake(s) and collect some entropy based on the
1146 * information from it. Once enough entropy is
1147 * available, the next atempt will trigger GMK/Key
1148 * Counter update and the station will be allowed to
1149 * continue.
1150 */
1151 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1152 "collect more entropy for random number "
1153 "generation");
1154 random_mark_pool_ready();
1155 wpa_sta_disconnect(wpa_auth, sm->addr);
1156 return;
1157 }
1158 break;
1159 case PAIRWISE_4:
1160 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1161 !sm->PTK_valid) {
1162 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1163 "received EAPOL-Key msg 4/4 in "
1164 "invalid state (%d) - dropped",
1165 sm->wpa_ptk_state);
1166 return;
1167 }
1168 break;
1169 case GROUP_2:
1170 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1171 || !sm->PTK_valid) {
1172 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1173 "received EAPOL-Key msg 2/2 in "
1174 "invalid state (%d) - dropped",
1175 sm->wpa_ptk_group_state);
1176 return;
1177 }
1178 break;
1179 #ifdef CONFIG_PEERKEY
1180 case SMK_M1:
1181 case SMK_M3:
1182 case SMK_ERROR:
1183 if (!wpa_auth->conf.peerkey) {
1184 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1185 "PeerKey use disabled - ignoring message");
1186 return;
1187 }
1188 if (!sm->PTK_valid) {
1189 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1190 "received EAPOL-Key msg SMK in "
1191 "invalid state - dropped");
1192 return;
1193 }
1194 break;
1195 #else /* CONFIG_PEERKEY */
1196 case SMK_M1:
1197 case SMK_M3:
1198 case SMK_ERROR:
1199 return; /* STSL disabled - ignore SMK messages */
1200 #endif /* CONFIG_PEERKEY */
1201 case REQUEST:
1202 break;
1203 }
1204
1205 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1206 "received EAPOL-Key frame (%s)", msgtxt);
1207
1208 if (key_info & WPA_KEY_INFO_ACK) {
1209 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1210 "received invalid EAPOL-Key: Key Ack set");
1211 return;
1212 }
1213
1214 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1215 !(key_info & WPA_KEY_INFO_MIC)) {
1216 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1217 "received invalid EAPOL-Key: Key MIC not set");
1218 return;
1219 }
1220
1221 #ifdef CONFIG_FILS
1222 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1223 (key_info & WPA_KEY_INFO_MIC)) {
1224 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1225 "received invalid EAPOL-Key: Key MIC set");
1226 return;
1227 }
1228 #endif /* CONFIG_FILS */
1229
1230 sm->MICVerified = FALSE;
1231 if (sm->PTK_valid && !sm->update_snonce) {
1232 if (mic_len &&
1233 wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
1234 data_len) &&
1235 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1236 wpa_try_alt_snonce(sm, data, data_len))) {
1237 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1238 "received EAPOL-Key with invalid MIC");
1239 return;
1240 }
1241 #ifdef CONFIG_FILS
1242 if (!mic_len &&
1243 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1244 &key_data_length) < 0) {
1245 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1246 "received EAPOL-Key with invalid MIC");
1247 return;
1248 }
1249 #endif /* CONFIG_FILS */
1250 sm->MICVerified = TRUE;
1251 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1252 sm->pending_1_of_4_timeout = 0;
1253 }
1254
1255 if (key_info & WPA_KEY_INFO_REQUEST) {
1256 if (sm->MICVerified) {
1257 sm->req_replay_counter_used = 1;
1258 os_memcpy(sm->req_replay_counter, key->replay_counter,
1259 WPA_REPLAY_COUNTER_LEN);
1260 } else {
1261 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1262 "received EAPOL-Key request with "
1263 "invalid MIC");
1264 return;
1265 }
1266
1267 /*
1268 * TODO: should decrypt key data field if encryption was used;
1269 * even though MAC address KDE is not normally encrypted,
1270 * supplicant is allowed to encrypt it.
1271 */
1272 if (msg == SMK_ERROR) {
1273 #ifdef CONFIG_PEERKEY
1274 wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
1275 #endif /* CONFIG_PEERKEY */
1276 return;
1277 } else if (key_info & WPA_KEY_INFO_ERROR) {
1278 if (wpa_receive_error_report(
1279 wpa_auth, sm,
1280 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1281 return; /* STA entry was removed */
1282 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1283 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1284 "received EAPOL-Key Request for new "
1285 "4-Way Handshake");
1286 wpa_request_new_ptk(sm);
1287 #ifdef CONFIG_PEERKEY
1288 } else if (msg == SMK_M1) {
1289 wpa_smk_m1(wpa_auth, sm, key, key_data,
1290 key_data_length);
1291 #endif /* CONFIG_PEERKEY */
1292 } else if (key_data_length > 0 &&
1293 wpa_parse_kde_ies(key_data, key_data_length,
1294 &kde) == 0 &&
1295 kde.mac_addr) {
1296 } else {
1297 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1298 "received EAPOL-Key Request for GTK "
1299 "rekeying");
1300 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1301 wpa_rekey_gtk(wpa_auth, NULL);
1302 }
1303 } else {
1304 /* Do not allow the same key replay counter to be reused. */
1305 wpa_replay_counter_mark_invalid(sm->key_replay,
1306 key->replay_counter);
1307
1308 if (msg == PAIRWISE_2) {
1309 /*
1310 * Maintain a copy of the pending EAPOL-Key frames in
1311 * case the EAPOL-Key frame was retransmitted. This is
1312 * needed to allow EAPOL-Key msg 2/4 reply to another
1313 * pending msg 1/4 to update the SNonce to work around
1314 * unexpected supplicant behavior.
1315 */
1316 os_memcpy(sm->prev_key_replay, sm->key_replay,
1317 sizeof(sm->key_replay));
1318 } else {
1319 os_memset(sm->prev_key_replay, 0,
1320 sizeof(sm->prev_key_replay));
1321 }
1322
1323 /*
1324 * Make sure old valid counters are not accepted anymore and
1325 * do not get copied again.
1326 */
1327 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1328 }
1329
1330 #ifdef CONFIG_PEERKEY
1331 if (msg == SMK_M3) {
1332 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
1333 return;
1334 }
1335 #endif /* CONFIG_PEERKEY */
1336
1337 os_free(sm->last_rx_eapol_key);
1338 sm->last_rx_eapol_key = os_memdup(data, data_len);
1339 if (sm->last_rx_eapol_key == NULL)
1340 return;
1341 sm->last_rx_eapol_key_len = data_len;
1342
1343 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1344 sm->EAPOLKeyReceived = TRUE;
1345 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1346 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1347 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1348 wpa_sm_step(sm);
1349 }
1350
1351
1352 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1353 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1354 {
1355 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1356 u8 *pos;
1357 int ret = 0;
1358
1359 /* GTK = PRF-X(GMK, "Group key expansion",
1360 * AA || GNonce || Time || random data)
1361 * The example described in the IEEE 802.11 standard uses only AA and
1362 * GNonce as inputs here. Add some more entropy since this derivation
1363 * is done only at the Authenticator and as such, does not need to be
1364 * exactly same.
1365 */
1366 os_memcpy(data, addr, ETH_ALEN);
1367 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1368 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1369 wpa_get_ntp_timestamp(pos);
1370 pos += 8;
1371 if (random_get_bytes(pos, 16) < 0)
1372 ret = -1;
1373
1374 #ifdef CONFIG_IEEE80211W
1375 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1376 #else /* CONFIG_IEEE80211W */
1377 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1378 < 0)
1379 ret = -1;
1380 #endif /* CONFIG_IEEE80211W */
1381
1382 return ret;
1383 }
1384
1385
1386 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1387 {
1388 struct wpa_authenticator *wpa_auth = eloop_ctx;
1389 struct wpa_state_machine *sm = timeout_ctx;
1390
1391 sm->pending_1_of_4_timeout = 0;
1392 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1393 sm->TimeoutEvt = TRUE;
1394 wpa_sm_step(sm);
1395 }
1396
1397
1398 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1399 struct wpa_state_machine *sm, int key_info,
1400 const u8 *key_rsc, const u8 *nonce,
1401 const u8 *kde, size_t kde_len,
1402 int keyidx, int encr, int force_version)
1403 {
1404 struct ieee802_1x_hdr *hdr;
1405 struct wpa_eapol_key *key;
1406 size_t len, mic_len, keyhdrlen;
1407 int alg;
1408 int key_data_len, pad_len = 0;
1409 u8 *buf, *pos;
1410 int version, pairwise;
1411 int i;
1412 u8 *key_mic, *key_data;
1413
1414 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
1415 keyhdrlen = sizeof(*key) + mic_len + 2;
1416
1417 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1418
1419 if (force_version)
1420 version = force_version;
1421 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1422 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1423 wpa_key_mgmt_fils(sm->wpa_key_mgmt))
1424 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1425 else if (wpa_use_aes_cmac(sm))
1426 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1427 else if (sm->pairwise != WPA_CIPHER_TKIP)
1428 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1429 else
1430 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1431
1432 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1433
1434 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1435 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1436 "encr=%d)",
1437 version,
1438 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1439 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1440 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1441 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1442 pairwise, (unsigned long) kde_len, keyidx, encr);
1443
1444 key_data_len = kde_len;
1445
1446 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1447 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1448 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1449 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1450 pad_len = key_data_len % 8;
1451 if (pad_len)
1452 pad_len = 8 - pad_len;
1453 key_data_len += pad_len + 8;
1454 }
1455
1456 len += key_data_len;
1457 if (!mic_len && encr)
1458 len += AES_BLOCK_SIZE;
1459
1460 hdr = os_zalloc(len);
1461 if (hdr == NULL)
1462 return;
1463 hdr->version = wpa_auth->conf.eapol_version;
1464 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1465 hdr->length = host_to_be16(len - sizeof(*hdr));
1466 key = (struct wpa_eapol_key *) (hdr + 1);
1467 key_mic = (u8 *) (key + 1);
1468 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1469
1470 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1471 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1472 key_info |= version;
1473 if (encr && sm->wpa == WPA_VERSION_WPA2)
1474 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1475 if (sm->wpa != WPA_VERSION_WPA2)
1476 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1477 WPA_PUT_BE16(key->key_info, key_info);
1478
1479 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1480 if ((key_info & WPA_KEY_INFO_SMK_MESSAGE) ||
1481 (sm->wpa == WPA_VERSION_WPA2 && !pairwise))
1482 WPA_PUT_BE16(key->key_length, 0);
1483 else
1484 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1485
1486 /* FIX: STSL: what to use as key_replay_counter? */
1487 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1488 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1489 os_memcpy(sm->key_replay[i].counter,
1490 sm->key_replay[i - 1].counter,
1491 WPA_REPLAY_COUNTER_LEN);
1492 }
1493 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1494 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1495 WPA_REPLAY_COUNTER_LEN);
1496 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1497 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1498 sm->key_replay[0].valid = TRUE;
1499
1500 if (nonce)
1501 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1502
1503 if (key_rsc)
1504 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1505
1506 if (kde && !encr) {
1507 os_memcpy(key_data, kde, kde_len);
1508 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1509 #ifdef CONFIG_FILS
1510 } else if (!mic_len) {
1511 const u8 *aad[1];
1512 size_t aad_len[1];
1513
1514 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1515 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1516 kde, kde_len);
1517
1518 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1519 sm->PTK.kek, sm->PTK.kek_len);
1520 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1521 * to Key Data (exclusive). */
1522 aad[0] = (u8 *) hdr;
1523 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1524 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1525 1, aad, aad_len, key_mic + 2) < 0) {
1526 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1527 return;
1528 }
1529
1530 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1531 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1532 #endif /* CONFIG_FILS */
1533 } else if (encr && kde) {
1534 buf = os_zalloc(key_data_len);
1535 if (buf == NULL) {
1536 os_free(hdr);
1537 return;
1538 }
1539 pos = buf;
1540 os_memcpy(pos, kde, kde_len);
1541 pos += kde_len;
1542
1543 if (pad_len)
1544 *pos++ = 0xdd;
1545
1546 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1547 buf, key_data_len);
1548 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1549 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1550 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1551 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1552 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1553 (key_data_len - 8) / 8, buf, key_data)) {
1554 os_free(hdr);
1555 os_free(buf);
1556 return;
1557 }
1558 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1559 #ifndef CONFIG_NO_RC4
1560 } else if (sm->PTK.kek_len == 16) {
1561 u8 ek[32];
1562 os_memcpy(key->key_iv,
1563 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1564 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1565 os_memcpy(ek, key->key_iv, 16);
1566 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1567 os_memcpy(key_data, buf, key_data_len);
1568 rc4_skip(ek, 32, 256, key_data, key_data_len);
1569 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1570 #endif /* CONFIG_NO_RC4 */
1571 } else {
1572 os_free(hdr);
1573 os_free(buf);
1574 return;
1575 }
1576 os_free(buf);
1577 }
1578
1579 if (key_info & WPA_KEY_INFO_MIC) {
1580 if (!sm->PTK_valid || !mic_len) {
1581 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1582 "PTK not valid when sending EAPOL-Key "
1583 "frame");
1584 os_free(hdr);
1585 return;
1586 }
1587
1588 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1589 sm->wpa_key_mgmt, version,
1590 (u8 *) hdr, len, key_mic);
1591 #ifdef CONFIG_TESTING_OPTIONS
1592 if (!pairwise &&
1593 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1594 drand48() <
1595 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1596 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1597 "Corrupting group EAPOL-Key Key MIC");
1598 key_mic[0]++;
1599 }
1600 #endif /* CONFIG_TESTING_OPTIONS */
1601 }
1602
1603 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1604 1);
1605 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1606 sm->pairwise_set);
1607 os_free(hdr);
1608 }
1609
1610
1611 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1612 struct wpa_state_machine *sm, int key_info,
1613 const u8 *key_rsc, const u8 *nonce,
1614 const u8 *kde, size_t kde_len,
1615 int keyidx, int encr)
1616 {
1617 int timeout_ms;
1618 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1619 u32 ctr;
1620
1621 if (sm == NULL)
1622 return;
1623
1624 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1625 keyidx, encr, 0);
1626
1627 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1628 if (ctr == 1 && wpa_auth->conf.tx_status)
1629 timeout_ms = pairwise ? eapol_key_timeout_first :
1630 eapol_key_timeout_first_group;
1631 else
1632 timeout_ms = eapol_key_timeout_subseq;
1633 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1634 sm->pending_1_of_4_timeout = 1;
1635 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1636 "counter %u)", timeout_ms, ctr);
1637 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1638 wpa_send_eapol_timeout, wpa_auth, sm);
1639 }
1640
1641
1642 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
1643 size_t data_len)
1644 {
1645 struct ieee802_1x_hdr *hdr;
1646 struct wpa_eapol_key *key;
1647 u16 key_info;
1648 int ret = 0;
1649 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1650 size_t mic_len = wpa_mic_len(akmp);
1651
1652 if (data_len < sizeof(*hdr) + sizeof(*key))
1653 return -1;
1654
1655 hdr = (struct ieee802_1x_hdr *) data;
1656 key = (struct wpa_eapol_key *) (hdr + 1);
1657 mic_pos = (u8 *) (key + 1);
1658 key_info = WPA_GET_BE16(key->key_info);
1659 os_memcpy(mic, mic_pos, mic_len);
1660 os_memset(mic_pos, 0, mic_len);
1661 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1662 key_info & WPA_KEY_INFO_TYPE_MASK,
1663 data, data_len, mic_pos) ||
1664 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1665 ret = -1;
1666 os_memcpy(mic_pos, mic, mic_len);
1667 return ret;
1668 }
1669
1670
1671 void wpa_remove_ptk(struct wpa_state_machine *sm)
1672 {
1673 sm->PTK_valid = FALSE;
1674 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1675 if (wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL,
1676 0))
1677 wpa_printf(MSG_DEBUG,
1678 "RSN: PTK removal from the driver failed");
1679 sm->pairwise_set = FALSE;
1680 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1681 }
1682
1683
1684 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1685 {
1686 int remove_ptk = 1;
1687
1688 if (sm == NULL)
1689 return -1;
1690
1691 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1692 "event %d notification", event);
1693
1694 switch (event) {
1695 case WPA_AUTH:
1696 #ifdef CONFIG_MESH
1697 /* PTKs are derived through AMPE */
1698 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1699 /* not mesh */
1700 break;
1701 }
1702 return 0;
1703 #endif /* CONFIG_MESH */
1704 case WPA_ASSOC:
1705 break;
1706 case WPA_DEAUTH:
1707 case WPA_DISASSOC:
1708 sm->DeauthenticationRequest = TRUE;
1709 break;
1710 case WPA_REAUTH:
1711 case WPA_REAUTH_EAPOL:
1712 if (!sm->started) {
1713 /*
1714 * When using WPS, we may end up here if the STA
1715 * manages to re-associate without the previous STA
1716 * entry getting removed. Consequently, we need to make
1717 * sure that the WPA state machines gets initialized
1718 * properly at this point.
1719 */
1720 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1721 "started - initialize now");
1722 sm->started = 1;
1723 sm->Init = TRUE;
1724 if (wpa_sm_step(sm) == 1)
1725 return 1; /* should not really happen */
1726 sm->Init = FALSE;
1727 sm->AuthenticationRequest = TRUE;
1728 break;
1729 }
1730 if (sm->GUpdateStationKeys) {
1731 /*
1732 * Reauthentication cancels the pending group key
1733 * update for this STA.
1734 */
1735 sm->group->GKeyDoneStations--;
1736 sm->GUpdateStationKeys = FALSE;
1737 sm->PtkGroupInit = TRUE;
1738 }
1739 sm->ReAuthenticationRequest = TRUE;
1740 break;
1741 case WPA_ASSOC_FT:
1742 #ifdef CONFIG_IEEE80211R_AP
1743 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1744 "after association");
1745 wpa_ft_install_ptk(sm);
1746
1747 /* Using FT protocol, not WPA auth state machine */
1748 sm->ft_completed = 1;
1749 return 0;
1750 #else /* CONFIG_IEEE80211R_AP */
1751 break;
1752 #endif /* CONFIG_IEEE80211R_AP */
1753 }
1754
1755 #ifdef CONFIG_IEEE80211R_AP
1756 sm->ft_completed = 0;
1757 #endif /* CONFIG_IEEE80211R_AP */
1758
1759 #ifdef CONFIG_IEEE80211W
1760 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1761 remove_ptk = 0;
1762 #endif /* CONFIG_IEEE80211W */
1763 #ifdef CONFIG_FILS
1764 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1765 (event == WPA_AUTH || event == WPA_ASSOC))
1766 remove_ptk = 0;
1767 #endif /* CONFIG_FILS */
1768
1769 if (remove_ptk) {
1770 sm->PTK_valid = FALSE;
1771 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1772
1773 if (event != WPA_REAUTH_EAPOL)
1774 wpa_remove_ptk(sm);
1775 }
1776
1777 if (sm->in_step_loop) {
1778 /*
1779 * wpa_sm_step() is already running - avoid recursive call to
1780 * it by making the existing loop process the new update.
1781 */
1782 sm->changed = TRUE;
1783 return 0;
1784 }
1785 return wpa_sm_step(sm);
1786 }
1787
1788
1789 SM_STATE(WPA_PTK, INITIALIZE)
1790 {
1791 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1792 if (sm->Init) {
1793 /* Init flag is not cleared here, so avoid busy
1794 * loop by claiming nothing changed. */
1795 sm->changed = FALSE;
1796 }
1797
1798 sm->keycount = 0;
1799 if (sm->GUpdateStationKeys)
1800 sm->group->GKeyDoneStations--;
1801 sm->GUpdateStationKeys = FALSE;
1802 if (sm->wpa == WPA_VERSION_WPA)
1803 sm->PInitAKeys = FALSE;
1804 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1805 * Local AA > Remote AA)) */) {
1806 sm->Pair = TRUE;
1807 }
1808 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1809 wpa_remove_ptk(sm);
1810 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1811 sm->TimeoutCtr = 0;
1812 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1813 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1814 WPA_EAPOL_authorized, 0);
1815 }
1816 }
1817
1818
1819 SM_STATE(WPA_PTK, DISCONNECT)
1820 {
1821 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1822 sm->Disconnect = FALSE;
1823 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1824 }
1825
1826
1827 SM_STATE(WPA_PTK, DISCONNECTED)
1828 {
1829 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1830 sm->DeauthenticationRequest = FALSE;
1831 }
1832
1833
1834 SM_STATE(WPA_PTK, AUTHENTICATION)
1835 {
1836 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1837 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1838 sm->PTK_valid = FALSE;
1839 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1840 1);
1841 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1842 sm->AuthenticationRequest = FALSE;
1843 }
1844
1845
1846 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1847 struct wpa_group *group)
1848 {
1849 if (group->first_sta_seen)
1850 return;
1851 /*
1852 * System has run bit further than at the time hostapd was started
1853 * potentially very early during boot up. This provides better chances
1854 * of collecting more randomness on embedded systems. Re-initialize the
1855 * GMK and Counter here to improve their strength if there was not
1856 * enough entropy available immediately after system startup.
1857 */
1858 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1859 "station");
1860 if (random_pool_ready() != 1) {
1861 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1862 "to proceed - reject first 4-way handshake");
1863 group->reject_4way_hs_for_entropy = TRUE;
1864 } else {
1865 group->first_sta_seen = TRUE;
1866 group->reject_4way_hs_for_entropy = FALSE;
1867 }
1868
1869 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1870 wpa_gtk_update(wpa_auth, group) < 0 ||
1871 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1872 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1873 group->first_sta_seen = FALSE;
1874 group->reject_4way_hs_for_entropy = TRUE;
1875 }
1876 }
1877
1878
1879 SM_STATE(WPA_PTK, AUTHENTICATION2)
1880 {
1881 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1882
1883 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1884 sm->ReAuthenticationRequest = FALSE;
1885
1886 /*
1887 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1888 * ambiguous. The Authenticator state machine uses a counter that is
1889 * incremented by one for each 4-way handshake. However, the security
1890 * analysis of 4-way handshake points out that unpredictable nonces
1891 * help in preventing precomputation attacks. Instead of the state
1892 * machine definition, use an unpredictable nonce value here to provide
1893 * stronger protection against potential precomputation attacks.
1894 */
1895 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1896 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1897 "ANonce.");
1898 sm->Disconnect = TRUE;
1899 return;
1900 }
1901 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1902 WPA_NONCE_LEN);
1903 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1904 * logical place than INITIALIZE since AUTHENTICATION2 can be
1905 * re-entered on ReAuthenticationRequest without going through
1906 * INITIALIZE. */
1907 sm->TimeoutCtr = 0;
1908 }
1909
1910
1911 SM_STATE(WPA_PTK, INITPMK)
1912 {
1913 u8 msk[2 * PMK_LEN];
1914 size_t len = 2 * PMK_LEN;
1915
1916 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1917 #ifdef CONFIG_IEEE80211R_AP
1918 sm->xxkey_len = 0;
1919 #endif /* CONFIG_IEEE80211R_AP */
1920 if (sm->pmksa) {
1921 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1922 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
1923 sm->pmk_len = sm->pmksa->pmk_len;
1924 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1925 unsigned int pmk_len;
1926
1927 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
1928 pmk_len = PMK_LEN_SUITE_B_192;
1929 else
1930 pmk_len = PMK_LEN;
1931 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1932 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
1933 pmk_len);
1934 if (len < pmk_len) {
1935 wpa_printf(MSG_DEBUG,
1936 "WPA: MSK not long enough (%u) to create PMK (%u)",
1937 (unsigned int) len, (unsigned int) pmk_len);
1938 sm->Disconnect = TRUE;
1939 return;
1940 }
1941 os_memcpy(sm->PMK, msk, pmk_len);
1942 sm->pmk_len = pmk_len;
1943 #ifdef CONFIG_IEEE80211R_AP
1944 if (len >= 2 * PMK_LEN) {
1945 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1946 sm->xxkey_len = PMK_LEN;
1947 }
1948 #endif /* CONFIG_IEEE80211R_AP */
1949 } else {
1950 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
1951 sm->wpa_auth->cb->get_msk);
1952 sm->Disconnect = TRUE;
1953 return;
1954 }
1955 os_memset(msk, 0, sizeof(msk));
1956
1957 sm->req_replay_counter_used = 0;
1958 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1959 * will break reauthentication since EAPOL state machines may not be
1960 * get into AUTHENTICATING state that clears keyRun before WPA state
1961 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1962 * state and takes PMK from the previously used AAA Key. This will
1963 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1964 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1965 * be good workaround for this issue. */
1966 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1967 }
1968
1969
1970 SM_STATE(WPA_PTK, INITPSK)
1971 {
1972 const u8 *psk;
1973 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1974 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1975 if (psk) {
1976 os_memcpy(sm->PMK, psk, PMK_LEN);
1977 sm->pmk_len = PMK_LEN;
1978 #ifdef CONFIG_IEEE80211R_AP
1979 os_memcpy(sm->xxkey, psk, PMK_LEN);
1980 sm->xxkey_len = PMK_LEN;
1981 #endif /* CONFIG_IEEE80211R_AP */
1982 }
1983 sm->req_replay_counter_used = 0;
1984 }
1985
1986
1987 SM_STATE(WPA_PTK, PTKSTART)
1988 {
1989 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1990 size_t pmkid_len = 0;
1991
1992 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1993 sm->PTKRequest = FALSE;
1994 sm->TimeoutEvt = FALSE;
1995 sm->alt_snonce_valid = FALSE;
1996
1997 sm->TimeoutCtr++;
1998 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
1999 /* No point in sending the EAPOL-Key - we will disconnect
2000 * immediately following this. */
2001 return;
2002 }
2003
2004 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2005 "sending 1/4 msg of 4-Way Handshake");
2006 /*
2007 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
2008 * one possible PSK for this STA.
2009 */
2010 if (sm->wpa == WPA_VERSION_WPA2 &&
2011 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2012 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
2013 pmkid = buf;
2014 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
2015 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
2016 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
2017 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2018 if (sm->pmksa) {
2019 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2020 sm->pmksa->pmkid, PMKID_LEN);
2021 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2022 /* No KCK available to derive PMKID */
2023 pmkid = NULL;
2024 } else {
2025 /*
2026 * Calculate PMKID since no PMKSA cache entry was
2027 * available with pre-calculated PMKID.
2028 */
2029 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2030 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2031 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
2032 }
2033 }
2034 wpa_send_eapol(sm->wpa_auth, sm,
2035 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2036 sm->ANonce, pmkid, pmkid_len, 0, 0);
2037 }
2038
2039
2040 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2041 const u8 *pmk, unsigned int pmk_len,
2042 struct wpa_ptk *ptk)
2043 {
2044 #ifdef CONFIG_IEEE80211R_AP
2045 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2046 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2047 #endif /* CONFIG_IEEE80211R_AP */
2048
2049 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2050 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2051 ptk, sm->wpa_key_mgmt, sm->pairwise);
2052 }
2053
2054
2055 #ifdef CONFIG_FILS
2056
2057 int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
2058 size_t pmk_len, const u8 *snonce, const u8 *anonce)
2059 {
2060 u8 ick[FILS_ICK_MAX_LEN];
2061 size_t ick_len;
2062 int res;
2063
2064 res = fils_pmk_to_ptk(pmk, pmk_len, sm->addr, sm->wpa_auth->addr,
2065 snonce, anonce, &sm->PTK, ick, &ick_len,
2066 sm->wpa_key_mgmt, sm->pairwise);
2067 if (res < 0)
2068 return res;
2069 sm->PTK_valid = TRUE;
2070
2071 res = fils_key_auth_sk(ick, ick_len, snonce, anonce,
2072 sm->addr, sm->wpa_auth->addr,
2073 NULL, 0, NULL, 0, /* TODO: SK+PFS */
2074 sm->wpa_key_mgmt, sm->fils_key_auth_sta,
2075 sm->fils_key_auth_ap,
2076 &sm->fils_key_auth_len);
2077 os_memset(ick, 0, sizeof(ick));
2078
2079 /* Store nonces for (Re)Association Request/Response frame processing */
2080 os_memcpy(sm->SNonce, snonce, FILS_NONCE_LEN);
2081 os_memcpy(sm->ANonce, anonce, FILS_NONCE_LEN);
2082
2083 return res;
2084 }
2085
2086
2087 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2088 u8 *buf, size_t buf_len, u16 *_key_data_len)
2089 {
2090 struct ieee802_1x_hdr *hdr;
2091 struct wpa_eapol_key *key;
2092 u8 *pos;
2093 u16 key_data_len;
2094 u8 *tmp;
2095 const u8 *aad[1];
2096 size_t aad_len[1];
2097
2098 hdr = (struct ieee802_1x_hdr *) buf;
2099 key = (struct wpa_eapol_key *) (hdr + 1);
2100 pos = (u8 *) (key + 1);
2101 key_data_len = WPA_GET_BE16(pos);
2102 if (key_data_len < AES_BLOCK_SIZE ||
2103 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2104 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2105 "No room for AES-SIV data in the frame");
2106 return -1;
2107 }
2108 pos += 2; /* Pointing at the Encrypted Key Data field */
2109
2110 tmp = os_malloc(key_data_len);
2111 if (!tmp)
2112 return -1;
2113
2114 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2115 * to Key Data (exclusive). */
2116 aad[0] = buf;
2117 aad_len[0] = pos - buf;
2118 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2119 1, aad, aad_len, tmp) < 0) {
2120 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2121 "Invalid AES-SIV data in the frame");
2122 bin_clear_free(tmp, key_data_len);
2123 return -1;
2124 }
2125
2126 /* AEAD decryption and validation completed successfully */
2127 key_data_len -= AES_BLOCK_SIZE;
2128 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2129 tmp, key_data_len);
2130
2131 /* Replace Key Data field with the decrypted version */
2132 os_memcpy(pos, tmp, key_data_len);
2133 pos -= 2; /* Key Data Length field */
2134 WPA_PUT_BE16(pos, key_data_len);
2135 bin_clear_free(tmp, key_data_len);
2136 if (_key_data_len)
2137 *_key_data_len = key_data_len;
2138 return 0;
2139 }
2140
2141
2142 int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
2143 const struct ieee80211_mgmt *mgmt, size_t frame_len,
2144 u8 *pos, size_t left)
2145 {
2146 u16 fc, stype;
2147 const u8 *end, *ie_start, *ie, *session, *crypt;
2148 struct ieee802_11_elems elems;
2149 const u8 *aad[5];
2150 size_t aad_len[5];
2151
2152 if (!sm || !sm->PTK_valid) {
2153 wpa_printf(MSG_DEBUG,
2154 "FILS: No KEK to decrypt Assocication Request frame");
2155 return -1;
2156 }
2157
2158 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2159 wpa_printf(MSG_DEBUG,
2160 "FILS: Not a FILS AKM - reject association");
2161 return -1;
2162 }
2163
2164 end = ((const u8 *) mgmt) + frame_len;
2165 fc = le_to_host16(mgmt->frame_control);
2166 stype = WLAN_FC_GET_STYPE(fc);
2167 if (stype == WLAN_FC_STYPE_REASSOC_REQ)
2168 ie_start = mgmt->u.reassoc_req.variable;
2169 else
2170 ie_start = mgmt->u.assoc_req.variable;
2171 ie = ie_start;
2172
2173 /*
2174 * Find FILS Session element which is the last unencrypted element in
2175 * the frame.
2176 */
2177 session = NULL;
2178 while (ie + 1 < end) {
2179 if (ie + 2 + ie[1] > end)
2180 break;
2181 if (ie[0] == WLAN_EID_EXTENSION &&
2182 ie[1] >= 1 + FILS_SESSION_LEN &&
2183 ie[2] == WLAN_EID_EXT_FILS_SESSION) {
2184 session = ie;
2185 break;
2186 }
2187 ie += 2 + ie[1];
2188 }
2189
2190 if (!session) {
2191 wpa_printf(MSG_DEBUG,
2192 "FILS: Could not find FILS Session element in Association Request frame - reject");
2193 return -1;
2194 }
2195 if (os_memcmp(fils_session, session + 3, FILS_SESSION_LEN) != 0) {
2196 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
2197 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
2198 fils_session, FILS_SESSION_LEN);
2199 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
2200 session + 3, FILS_SESSION_LEN);
2201 return -1;
2202 }
2203 crypt = session + 2 + session[1];
2204
2205 if (end - crypt < AES_BLOCK_SIZE) {
2206 wpa_printf(MSG_DEBUG,
2207 "FILS: Too short frame to include AES-SIV data");
2208 return -1;
2209 }
2210
2211 /* AES-SIV AAD vectors */
2212
2213 /* The STA's MAC address */
2214 aad[0] = mgmt->sa;
2215 aad_len[0] = ETH_ALEN;
2216 /* The AP's BSSID */
2217 aad[1] = mgmt->da;
2218 aad_len[1] = ETH_ALEN;
2219 /* The STA's nonce */
2220 aad[2] = sm->SNonce;
2221 aad_len[2] = FILS_NONCE_LEN;
2222 /* The AP's nonce */
2223 aad[3] = sm->ANonce;
2224 aad_len[3] = FILS_NONCE_LEN;
2225 /*
2226 * The (Re)Association Request frame from the Capability Information
2227 * field to the FILS Session element (both inclusive).
2228 */
2229 aad[4] = (const u8 *) &mgmt->u.assoc_req.capab_info;
2230 aad_len[4] = crypt - aad[4];
2231
2232 if (aes_siv_decrypt(sm->PTK.kek, sm->PTK.kek_len, crypt, end - crypt,
2233 5, aad, aad_len, pos + (crypt - ie_start)) < 0) {
2234 wpa_printf(MSG_DEBUG,
2235 "FILS: Invalid AES-SIV data in the frame");
2236 return -1;
2237 }
2238 wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
2239 pos, left - AES_BLOCK_SIZE);
2240
2241 if (ieee802_11_parse_elems(pos, left - AES_BLOCK_SIZE, &elems, 1) ==
2242 ParseFailed) {
2243 wpa_printf(MSG_DEBUG,
2244 "FILS: Failed to parse decrypted elements");
2245 return -1;
2246 }
2247 if (!elems.fils_key_confirm) {
2248 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
2249 return -1;
2250 }
2251 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
2252 wpa_printf(MSG_DEBUG,
2253 "FILS: Unexpected Key-Auth length %d (expected %d)",
2254 elems.fils_key_confirm_len,
2255 (int) sm->fils_key_auth_len);
2256 return -1;
2257 }
2258 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
2259 sm->fils_key_auth_len) != 0) {
2260 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
2261 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
2262 elems.fils_key_confirm,
2263 elems.fils_key_confirm_len);
2264 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
2265 sm->fils_key_auth_sta, sm->fils_key_auth_len);
2266 return -1;
2267 }
2268
2269 return left - AES_BLOCK_SIZE;
2270 }
2271
2272
2273 int fils_encrypt_assoc(struct wpa_state_machine *sm, u8 *buf,
2274 size_t current_len, size_t max_len,
2275 const struct wpabuf *hlp)
2276 {
2277 u8 *end = buf + max_len;
2278 u8 *pos = buf + current_len;
2279 struct ieee80211_mgmt *mgmt;
2280 struct wpabuf *plain;
2281 u8 *len, *tmp, *tmp2;
2282 u8 hdr[2];
2283 u8 *gtk, dummy_gtk[32];
2284 size_t gtk_len;
2285 struct wpa_group *gsm;
2286 const u8 *aad[5];
2287 size_t aad_len[5];
2288
2289 if (!sm || !sm->PTK_valid)
2290 return -1;
2291
2292 wpa_hexdump(MSG_DEBUG,
2293 "FILS: Association Response frame before FILS processing",
2294 buf, current_len);
2295
2296 mgmt = (struct ieee80211_mgmt *) buf;
2297
2298 /* AES-SIV AAD vectors */
2299
2300 /* The AP's BSSID */
2301 aad[0] = mgmt->sa;
2302 aad_len[0] = ETH_ALEN;
2303 /* The STA's MAC address */
2304 aad[1] = mgmt->da;
2305 aad_len[1] = ETH_ALEN;
2306 /* The AP's nonce */
2307 aad[2] = sm->ANonce;
2308 aad_len[2] = FILS_NONCE_LEN;
2309 /* The STA's nonce */
2310 aad[3] = sm->SNonce;
2311 aad_len[3] = FILS_NONCE_LEN;
2312 /*
2313 * The (Re)Association Response frame from the Capability Information
2314 * field (the same offset in both Association and Reassociation
2315 * Response frames) to the FILS Session element (both inclusive).
2316 */
2317 aad[4] = (const u8 *) &mgmt->u.assoc_resp.capab_info;
2318 aad_len[4] = pos - aad[4];
2319
2320 /* The following elements will be encrypted with AES-SIV */
2321
2322 plain = wpabuf_alloc(1000);
2323 if (!plain)
2324 return -1;
2325
2326 /* TODO: FILS Public Key */
2327
2328 /* FILS Key Confirmation */
2329 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2330 wpabuf_put_u8(plain, 1 + sm->fils_key_auth_len); /* Length */
2331 /* Element ID Extension */
2332 wpabuf_put_u8(plain, WLAN_EID_EXT_FILS_KEY_CONFIRM);
2333 wpabuf_put_data(plain, sm->fils_key_auth_ap, sm->fils_key_auth_len);
2334
2335 /* FILS HLP Container */
2336 if (hlp)
2337 wpabuf_put_buf(plain, hlp);
2338
2339 /* TODO: FILS IP Address Assignment */
2340
2341 /* Key Delivery */
2342 gsm = sm->group;
2343 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2344 len = wpabuf_put(plain, 1);
2345 wpabuf_put_u8(plain, WLAN_EID_EXT_KEY_DELIVERY);
2346 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN,
2347 wpabuf_put(plain, WPA_KEY_RSC_LEN));
2348 /* GTK KDE */
2349 gtk = gsm->GTK[gsm->GN - 1];
2350 gtk_len = gsm->GTK_len;
2351 if (sm->wpa_auth->conf.disable_gtk) {
2352 /*
2353 * Provide unique random GTK to each STA to prevent use
2354 * of GTK in the BSS.
2355 */
2356 if (random_get_bytes(dummy_gtk, gtk_len) < 0) {
2357 wpabuf_free(plain);
2358 return -1;
2359 }
2360 gtk = dummy_gtk;
2361 }
2362 hdr[0] = gsm->GN & 0x03;
2363 hdr[1] = 0;
2364 tmp = wpabuf_put(plain, 0);
2365 tmp2 = wpa_add_kde(tmp, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2366 gtk, gtk_len);
2367 wpabuf_put(plain, tmp2 - tmp);
2368
2369 /* IGTK KDE */
2370 tmp = wpabuf_put(plain, 0);
2371 tmp2 = ieee80211w_kde_add(sm, tmp);
2372 wpabuf_put(plain, tmp2 - tmp);
2373
2374 *len = (u8 *) wpabuf_put(plain, 0) - len - 1;
2375
2376 if (pos + wpabuf_len(plain) + AES_BLOCK_SIZE > end) {
2377 wpa_printf(MSG_DEBUG,
2378 "FILS: Not enough room for FILS elements");
2379 wpabuf_free(plain);
2380 return -1;
2381 }
2382
2383 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: Association Response plaintext",
2384 plain);
2385
2386 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len,
2387 wpabuf_head(plain), wpabuf_len(plain),
2388 5, aad, aad_len, pos) < 0) {
2389 wpabuf_free(plain);
2390 return -1;
2391 }
2392
2393 wpa_hexdump(MSG_DEBUG,
2394 "FILS: Encrypted Association Response elements",
2395 pos, AES_BLOCK_SIZE + wpabuf_len(plain));
2396 current_len += wpabuf_len(plain) + AES_BLOCK_SIZE;
2397 wpabuf_free(plain);
2398
2399 sm->fils_completed = 1;
2400
2401 return current_len;
2402 }
2403
2404
2405 int fils_set_tk(struct wpa_state_machine *sm)
2406 {
2407 enum wpa_alg alg;
2408 int klen;
2409
2410 if (!sm || !sm->PTK_valid)
2411 return -1;
2412
2413 alg = wpa_cipher_to_alg(sm->pairwise);
2414 klen = wpa_cipher_key_len(sm->pairwise);
2415
2416 wpa_printf(MSG_DEBUG, "FILS: Configure TK to the driver");
2417 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2418 sm->PTK.tk, klen)) {
2419 wpa_printf(MSG_DEBUG, "FILS: Failed to set TK to the driver");
2420 return -1;
2421 }
2422
2423 return 0;
2424 }
2425
2426 #endif /* CONFIG_FILS */
2427
2428
2429 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2430 {
2431 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2432 struct wpa_ptk PTK;
2433 int ok = 0, psk_found = 0;
2434 const u8 *pmk = NULL;
2435 unsigned int pmk_len;
2436 int ft;
2437 const u8 *eapol_key_ie, *key_data, *mic;
2438 u16 key_data_length;
2439 size_t mic_len, eapol_key_ie_len;
2440 struct ieee802_1x_hdr *hdr;
2441 struct wpa_eapol_key *key;
2442 struct wpa_eapol_ie_parse kde;
2443
2444 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2445 sm->EAPOLKeyReceived = FALSE;
2446 sm->update_snonce = FALSE;
2447 os_memset(&PTK, 0, sizeof(PTK));
2448
2449 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
2450
2451 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2452 * WPA-PSK: iterate through possible PSKs and select the one matching
2453 * the packet */
2454 for (;;) {
2455 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2456 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2457 sm->p2p_dev_addr, pmk);
2458 if (pmk == NULL)
2459 break;
2460 psk_found = 1;
2461 pmk_len = PMK_LEN;
2462 } else {
2463 pmk = sm->PMK;
2464 pmk_len = sm->pmk_len;
2465 }
2466
2467 if (wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK) < 0)
2468 break;
2469
2470 if (mic_len &&
2471 wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
2472 sm->last_rx_eapol_key,
2473 sm->last_rx_eapol_key_len) == 0) {
2474 ok = 1;
2475 break;
2476 }
2477
2478 #ifdef CONFIG_FILS
2479 if (!mic_len &&
2480 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2481 sm->last_rx_eapol_key_len, NULL) == 0) {
2482 ok = 1;
2483 break;
2484 }
2485 #endif /* CONFIG_FILS */
2486
2487 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
2488 break;
2489 }
2490
2491 if (!ok) {
2492 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2493 "invalid MIC in msg 2/4 of 4-Way Handshake");
2494 if (psk_found)
2495 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2496 return;
2497 }
2498
2499 /*
2500 * Note: last_rx_eapol_key length fields have already been validated in
2501 * wpa_receive().
2502 */
2503 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2504 key = (struct wpa_eapol_key *) (hdr + 1);
2505 mic = (u8 *) (key + 1);
2506 key_data = mic + mic_len + 2;
2507 key_data_length = WPA_GET_BE16(mic + mic_len);
2508 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2509 sizeof(*key) - mic_len - 2)
2510 return;
2511
2512 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2513 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2514 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2515 return;
2516 }
2517 if (kde.rsn_ie) {
2518 eapol_key_ie = kde.rsn_ie;
2519 eapol_key_ie_len = kde.rsn_ie_len;
2520 } else if (kde.osen) {
2521 eapol_key_ie = kde.osen;
2522 eapol_key_ie_len = kde.osen_len;
2523 } else {
2524 eapol_key_ie = kde.wpa_ie;
2525 eapol_key_ie_len = kde.wpa_ie_len;
2526 }
2527 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2528 if (sm->wpa_ie == NULL ||
2529 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2530 eapol_key_ie, eapol_key_ie_len)) {
2531 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2532 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2533 if (sm->wpa_ie) {
2534 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2535 sm->wpa_ie, sm->wpa_ie_len);
2536 }
2537 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2538 eapol_key_ie, eapol_key_ie_len);
2539 /* MLME-DEAUTHENTICATE.request */
2540 wpa_sta_disconnect(wpa_auth, sm->addr);
2541 return;
2542 }
2543 #ifdef CONFIG_IEEE80211R_AP
2544 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2545 wpa_sta_disconnect(wpa_auth, sm->addr);
2546 return;
2547 }
2548 #endif /* CONFIG_IEEE80211R_AP */
2549 #ifdef CONFIG_P2P
2550 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2551 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2552 int idx;
2553 wpa_printf(MSG_DEBUG,
2554 "P2P: IP address requested in EAPOL-Key exchange");
2555 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2556 if (idx >= 0) {
2557 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2558 bitfield_set(wpa_auth->ip_pool, idx);
2559 WPA_PUT_BE32(sm->ip_addr, start + idx);
2560 wpa_printf(MSG_DEBUG,
2561 "P2P: Assigned IP address %u.%u.%u.%u to "
2562 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2563 sm->ip_addr[2], sm->ip_addr[3],
2564 MAC2STR(sm->addr));
2565 }
2566 }
2567 #endif /* CONFIG_P2P */
2568
2569 #ifdef CONFIG_IEEE80211R_AP
2570 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2571 /*
2572 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2573 * with the value we derived.
2574 */
2575 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2576 WPA_PMK_NAME_LEN) != 0) {
2577 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2578 "PMKR1Name mismatch in FT 4-way "
2579 "handshake");
2580 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2581 "Supplicant",
2582 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2583 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2584 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2585 return;
2586 }
2587 }
2588 #endif /* CONFIG_IEEE80211R_AP */
2589
2590 sm->pending_1_of_4_timeout = 0;
2591 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2592
2593 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2594 /* PSK may have changed from the previous choice, so update
2595 * state machine data based on whatever PSK was selected here.
2596 */
2597 os_memcpy(sm->PMK, pmk, PMK_LEN);
2598 sm->pmk_len = PMK_LEN;
2599 }
2600
2601 sm->MICVerified = TRUE;
2602
2603 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2604 sm->PTK_valid = TRUE;
2605 }
2606
2607
2608 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2609 {
2610 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2611 sm->TimeoutCtr = 0;
2612 }
2613
2614
2615 #ifdef CONFIG_IEEE80211W
2616
2617 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2618 {
2619 if (sm->mgmt_frame_prot) {
2620 size_t len;
2621 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2622 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2623 }
2624
2625 return 0;
2626 }
2627
2628
2629 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2630 {
2631 struct wpa_igtk_kde igtk;
2632 struct wpa_group *gsm = sm->group;
2633 u8 rsc[WPA_KEY_RSC_LEN];
2634 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2635
2636 if (!sm->mgmt_frame_prot)
2637 return pos;
2638
2639 igtk.keyid[0] = gsm->GN_igtk;
2640 igtk.keyid[1] = 0;
2641 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
2642 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
2643 os_memset(igtk.pn, 0, sizeof(igtk.pn));
2644 else
2645 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
2646 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
2647 if (sm->wpa_auth->conf.disable_gtk) {
2648 /*
2649 * Provide unique random IGTK to each STA to prevent use of
2650 * IGTK in the BSS.
2651 */
2652 if (random_get_bytes(igtk.igtk, len) < 0)
2653 return pos;
2654 }
2655 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
2656 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
2657 NULL, 0);
2658
2659 return pos;
2660 }
2661
2662 #else /* CONFIG_IEEE80211W */
2663
2664 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2665 {
2666 return 0;
2667 }
2668
2669
2670 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2671 {
2672 return pos;
2673 }
2674
2675 #endif /* CONFIG_IEEE80211W */
2676
2677
2678 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
2679 {
2680 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
2681 size_t gtk_len, kde_len;
2682 struct wpa_group *gsm = sm->group;
2683 u8 *wpa_ie;
2684 int wpa_ie_len, secure, keyidx, encr = 0;
2685
2686 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
2687 sm->TimeoutEvt = FALSE;
2688
2689 sm->TimeoutCtr++;
2690 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
2691 /* No point in sending the EAPOL-Key - we will disconnect
2692 * immediately following this. */
2693 return;
2694 }
2695
2696 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2697 GTK[GN], IGTK, [FTIE], [TIE * 2])
2698 */
2699 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2700 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2701 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2702 wpa_ie = sm->wpa_auth->wpa_ie;
2703 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2704 if (sm->wpa == WPA_VERSION_WPA &&
2705 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2706 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2707 /* WPA-only STA, remove RSN IE and possible MDIE */
2708 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2709 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
2710 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2711 wpa_ie_len = wpa_ie[1] + 2;
2712 }
2713 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2714 "sending 3/4 msg of 4-Way Handshake");
2715 if (sm->wpa == WPA_VERSION_WPA2) {
2716 /* WPA2 send GTK in the 4-way handshake */
2717 secure = 1;
2718 gtk = gsm->GTK[gsm->GN - 1];
2719 gtk_len = gsm->GTK_len;
2720 if (sm->wpa_auth->conf.disable_gtk) {
2721 /*
2722 * Provide unique random GTK to each STA to prevent use
2723 * of GTK in the BSS.
2724 */
2725 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2726 return;
2727 gtk = dummy_gtk;
2728 }
2729 keyidx = gsm->GN;
2730 _rsc = rsc;
2731 encr = 1;
2732 } else {
2733 /* WPA does not include GTK in msg 3/4 */
2734 secure = 0;
2735 gtk = NULL;
2736 gtk_len = 0;
2737 keyidx = 0;
2738 _rsc = NULL;
2739 if (sm->rx_eapol_key_secure) {
2740 /*
2741 * It looks like Windows 7 supplicant tries to use
2742 * Secure bit in msg 2/4 after having reported Michael
2743 * MIC failure and it then rejects the 4-way handshake
2744 * if msg 3/4 does not set Secure bit. Work around this
2745 * by setting the Secure bit here even in the case of
2746 * WPA if the supplicant used it first.
2747 */
2748 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2749 "STA used Secure bit in WPA msg 2/4 - "
2750 "set Secure for 3/4 as workaround");
2751 secure = 1;
2752 }
2753 }
2754
2755 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2756 if (gtk)
2757 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2758 #ifdef CONFIG_IEEE80211R_AP
2759 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2760 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2761 kde_len += 300; /* FTIE + 2 * TIE */
2762 }
2763 #endif /* CONFIG_IEEE80211R_AP */
2764 #ifdef CONFIG_P2P
2765 if (WPA_GET_BE32(sm->ip_addr) > 0)
2766 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2767 #endif /* CONFIG_P2P */
2768 kde = os_malloc(kde_len);
2769 if (kde == NULL)
2770 return;
2771
2772 pos = kde;
2773 os_memcpy(pos, wpa_ie, wpa_ie_len);
2774 pos += wpa_ie_len;
2775 #ifdef CONFIG_IEEE80211R_AP
2776 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2777 int res;
2778 size_t elen;
2779
2780 elen = pos - kde;
2781 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
2782 if (res < 0) {
2783 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2784 "PMKR1Name into RSN IE in EAPOL-Key data");
2785 os_free(kde);
2786 return;
2787 }
2788 pos -= wpa_ie_len;
2789 pos += elen;
2790 }
2791 #endif /* CONFIG_IEEE80211R_AP */
2792 if (gtk) {
2793 u8 hdr[2];
2794 hdr[0] = keyidx & 0x03;
2795 hdr[1] = 0;
2796 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2797 gtk, gtk_len);
2798 }
2799 pos = ieee80211w_kde_add(sm, pos);
2800
2801 #ifdef CONFIG_IEEE80211R_AP
2802 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2803 int res;
2804 struct wpa_auth_config *conf;
2805
2806 conf = &sm->wpa_auth->conf;
2807 if (sm->assoc_resp_ftie &&
2808 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
2809 os_memcpy(pos, sm->assoc_resp_ftie,
2810 2 + sm->assoc_resp_ftie[1]);
2811 res = 2 + sm->assoc_resp_ftie[1];
2812 } else {
2813 res = wpa_write_ftie(conf, conf->r0_key_holder,
2814 conf->r0_key_holder_len,
2815 NULL, NULL, pos,
2816 kde + kde_len - pos,
2817 NULL, 0);
2818 }
2819 if (res < 0) {
2820 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2821 "into EAPOL-Key Key Data");
2822 os_free(kde);
2823 return;
2824 }
2825 pos += res;
2826
2827 /* TIE[ReassociationDeadline] (TU) */
2828 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2829 *pos++ = 5;
2830 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2831 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2832 pos += 4;
2833
2834 /* TIE[KeyLifetime] (seconds) */
2835 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2836 *pos++ = 5;
2837 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2838 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2839 pos += 4;
2840 }
2841 #endif /* CONFIG_IEEE80211R_AP */
2842 #ifdef CONFIG_P2P
2843 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2844 u8 addr[3 * 4];
2845 os_memcpy(addr, sm->ip_addr, 4);
2846 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2847 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2848 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2849 addr, sizeof(addr), NULL, 0);
2850 }
2851 #endif /* CONFIG_P2P */
2852
2853 wpa_send_eapol(sm->wpa_auth, sm,
2854 (secure ? WPA_KEY_INFO_SECURE : 0) |
2855 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
2856 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2857 WPA_KEY_INFO_KEY_TYPE,
2858 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2859 os_free(kde);
2860 }
2861
2862
2863 SM_STATE(WPA_PTK, PTKINITDONE)
2864 {
2865 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2866 sm->EAPOLKeyReceived = FALSE;
2867 if (sm->Pair) {
2868 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2869 int klen = wpa_cipher_key_len(sm->pairwise);
2870 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2871 sm->PTK.tk, klen)) {
2872 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2873 return;
2874 }
2875 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2876 sm->pairwise_set = TRUE;
2877
2878 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2879 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2880 eloop_register_timeout(sm->wpa_auth->conf.
2881 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2882 sm->wpa_auth, sm);
2883 }
2884
2885 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2886 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2887 WPA_EAPOL_authorized, 1);
2888 }
2889 }
2890
2891 if (0 /* IBSS == TRUE */) {
2892 sm->keycount++;
2893 if (sm->keycount == 2) {
2894 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2895 WPA_EAPOL_portValid, 1);
2896 }
2897 } else {
2898 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2899 1);
2900 }
2901 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2902 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2903 if (sm->wpa == WPA_VERSION_WPA)
2904 sm->PInitAKeys = TRUE;
2905 else
2906 sm->has_GTK = TRUE;
2907 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2908 "pairwise key handshake completed (%s)",
2909 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2910
2911 #ifdef CONFIG_IEEE80211R_AP
2912 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2913 #endif /* CONFIG_IEEE80211R_AP */
2914 }
2915
2916
2917 SM_STEP(WPA_PTK)
2918 {
2919 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2920
2921 if (sm->Init)
2922 SM_ENTER(WPA_PTK, INITIALIZE);
2923 else if (sm->Disconnect
2924 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2925 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2926 "WPA_PTK: sm->Disconnect");
2927 SM_ENTER(WPA_PTK, DISCONNECT);
2928 }
2929 else if (sm->DeauthenticationRequest)
2930 SM_ENTER(WPA_PTK, DISCONNECTED);
2931 else if (sm->AuthenticationRequest)
2932 SM_ENTER(WPA_PTK, AUTHENTICATION);
2933 else if (sm->ReAuthenticationRequest)
2934 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2935 else if (sm->PTKRequest)
2936 SM_ENTER(WPA_PTK, PTKSTART);
2937 else switch (sm->wpa_ptk_state) {
2938 case WPA_PTK_INITIALIZE:
2939 break;
2940 case WPA_PTK_DISCONNECT:
2941 SM_ENTER(WPA_PTK, DISCONNECTED);
2942 break;
2943 case WPA_PTK_DISCONNECTED:
2944 SM_ENTER(WPA_PTK, INITIALIZE);
2945 break;
2946 case WPA_PTK_AUTHENTICATION:
2947 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2948 break;
2949 case WPA_PTK_AUTHENTICATION2:
2950 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2951 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2952 WPA_EAPOL_keyRun) > 0)
2953 SM_ENTER(WPA_PTK, INITPMK);
2954 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2955 /* FIX: && 802.1X::keyRun */)
2956 SM_ENTER(WPA_PTK, INITPSK);
2957 break;
2958 case WPA_PTK_INITPMK:
2959 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2960 WPA_EAPOL_keyAvailable) > 0)
2961 SM_ENTER(WPA_PTK, PTKSTART);
2962 else {
2963 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2964 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2965 "INITPMK - keyAvailable = false");
2966 SM_ENTER(WPA_PTK, DISCONNECT);
2967 }
2968 break;
2969 case WPA_PTK_INITPSK:
2970 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2971 NULL))
2972 SM_ENTER(WPA_PTK, PTKSTART);
2973 else {
2974 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2975 "no PSK configured for the STA");
2976 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2977 SM_ENTER(WPA_PTK, DISCONNECT);
2978 }
2979 break;
2980 case WPA_PTK_PTKSTART:
2981 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2982 sm->EAPOLKeyPairwise)
2983 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2984 else if (sm->TimeoutCtr >
2985 sm->wpa_auth->conf.wpa_pairwise_update_count) {
2986 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2987 wpa_auth_vlogger(
2988 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2989 "PTKSTART: Retry limit %u reached",
2990 sm->wpa_auth->conf.wpa_pairwise_update_count);
2991 SM_ENTER(WPA_PTK, DISCONNECT);
2992 } else if (sm->TimeoutEvt)
2993 SM_ENTER(WPA_PTK, PTKSTART);
2994 break;
2995 case WPA_PTK_PTKCALCNEGOTIATING:
2996 if (sm->MICVerified)
2997 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2998 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2999 sm->EAPOLKeyPairwise)
3000 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3001 else if (sm->TimeoutEvt)
3002 SM_ENTER(WPA_PTK, PTKSTART);
3003 break;
3004 case WPA_PTK_PTKCALCNEGOTIATING2:
3005 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3006 break;
3007 case WPA_PTK_PTKINITNEGOTIATING:
3008 if (sm->update_snonce)
3009 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3010 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3011 sm->EAPOLKeyPairwise && sm->MICVerified)
3012 SM_ENTER(WPA_PTK, PTKINITDONE);
3013 else if (sm->TimeoutCtr >
3014 sm->wpa_auth->conf.wpa_pairwise_update_count) {
3015 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3016 wpa_auth_vlogger(
3017 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3018 "PTKINITNEGOTIATING: Retry limit %u reached",
3019 sm->wpa_auth->conf.wpa_pairwise_update_count);
3020 SM_ENTER(WPA_PTK, DISCONNECT);
3021 } else if (sm->TimeoutEvt)
3022 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3023 break;
3024 case WPA_PTK_PTKINITDONE:
3025 break;
3026 }
3027 }
3028
3029
3030 SM_STATE(WPA_PTK_GROUP, IDLE)
3031 {
3032 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
3033 if (sm->Init) {
3034 /* Init flag is not cleared here, so avoid busy
3035 * loop by claiming nothing changed. */
3036 sm->changed = FALSE;
3037 }
3038 sm->GTimeoutCtr = 0;
3039 }
3040
3041
3042 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
3043 {
3044 u8 rsc[WPA_KEY_RSC_LEN];
3045 struct wpa_group *gsm = sm->group;
3046 const u8 *kde;
3047 u8 *kde_buf = NULL, *pos, hdr[2];
3048 size_t kde_len;
3049 u8 *gtk, dummy_gtk[32];
3050
3051 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
3052
3053 sm->GTimeoutCtr++;
3054 if (sm->GTimeoutCtr > sm->wpa_auth->conf.wpa_group_update_count) {
3055 /* No point in sending the EAPOL-Key - we will disconnect
3056 * immediately following this. */
3057 return;
3058 }
3059
3060 if (sm->wpa == WPA_VERSION_WPA)
3061 sm->PInitAKeys = FALSE;
3062 sm->TimeoutEvt = FALSE;
3063 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
3064 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3065 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
3066 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3067 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3068 "sending 1/2 msg of Group Key Handshake");
3069
3070 gtk = gsm->GTK[gsm->GN - 1];
3071 if (sm->wpa_auth->conf.disable_gtk) {
3072 /*
3073 * Provide unique random GTK to each STA to prevent use
3074 * of GTK in the BSS.
3075 */
3076 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
3077 return;
3078 gtk = dummy_gtk;
3079 }
3080 if (sm->wpa == WPA_VERSION_WPA2) {
3081 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
3082 ieee80211w_kde_len(sm);
3083 kde_buf = os_malloc(kde_len);
3084 if (kde_buf == NULL)
3085 return;
3086
3087 kde = pos = kde_buf;
3088 hdr[0] = gsm->GN & 0x03;
3089 hdr[1] = 0;
3090 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3091 gtk, gsm->GTK_len);
3092 pos = ieee80211w_kde_add(sm, pos);
3093 kde_len = pos - kde;
3094 } else {
3095 kde = gtk;
3096 kde_len = gsm->GTK_len;
3097 }
3098
3099 wpa_send_eapol(sm->wpa_auth, sm,
3100 WPA_KEY_INFO_SECURE |
3101 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
3102 WPA_KEY_INFO_ACK |
3103 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
3104 rsc, NULL, kde, kde_len, gsm->GN, 1);
3105
3106 os_free(kde_buf);
3107 }
3108
3109
3110 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
3111 {
3112 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
3113 sm->EAPOLKeyReceived = FALSE;
3114 if (sm->GUpdateStationKeys)
3115 sm->group->GKeyDoneStations--;
3116 sm->GUpdateStationKeys = FALSE;
3117 sm->GTimeoutCtr = 0;
3118 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
3119 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3120 "group key handshake completed (%s)",
3121 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3122 sm->has_GTK = TRUE;
3123 }
3124
3125
3126 SM_STATE(WPA_PTK_GROUP, KEYERROR)
3127 {
3128 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
3129 if (sm->GUpdateStationKeys)
3130 sm->group->GKeyDoneStations--;
3131 sm->GUpdateStationKeys = FALSE;
3132 sm->Disconnect = TRUE;
3133 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3134 "group key handshake failed (%s) after %u tries",
3135 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN",
3136 sm->wpa_auth->conf.wpa_group_update_count);
3137 }
3138
3139
3140 SM_STEP(WPA_PTK_GROUP)
3141 {
3142 if (sm->Init || sm->PtkGroupInit) {
3143 SM_ENTER(WPA_PTK_GROUP, IDLE);
3144 sm->PtkGroupInit = FALSE;
3145 } else switch (sm->wpa_ptk_group_state) {
3146 case WPA_PTK_GROUP_IDLE:
3147 if (sm->GUpdateStationKeys ||
3148 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
3149 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3150 break;
3151 case WPA_PTK_GROUP_REKEYNEGOTIATING:
3152 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3153 !sm->EAPOLKeyPairwise && sm->MICVerified)
3154 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
3155 else if (sm->GTimeoutCtr >
3156 sm->wpa_auth->conf.wpa_group_update_count)
3157 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
3158 else if (sm->TimeoutEvt)
3159 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3160 break;
3161 case WPA_PTK_GROUP_KEYERROR:
3162 SM_ENTER(WPA_PTK_GROUP, IDLE);
3163 break;
3164 case WPA_PTK_GROUP_REKEYESTABLISHED:
3165 SM_ENTER(WPA_PTK_GROUP, IDLE);
3166 break;
3167 }
3168 }
3169
3170
3171 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
3172 struct wpa_group *group)
3173 {
3174 int ret = 0;
3175
3176 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3177 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3178 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
3179 wpa_auth->addr, group->GNonce,
3180 group->GTK[group->GN - 1], group->GTK_len) < 0)
3181 ret = -1;
3182 wpa_hexdump_key(MSG_DEBUG, "GTK",
3183 group->GTK[group->GN - 1], group->GTK_len);
3184
3185 #ifdef CONFIG_IEEE80211W
3186 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3187 size_t len;
3188 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3189 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3190 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3191 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
3192 wpa_auth->addr, group->GNonce,
3193 group->IGTK[group->GN_igtk - 4], len) < 0)
3194 ret = -1;
3195 wpa_hexdump_key(MSG_DEBUG, "IGTK",
3196 group->IGTK[group->GN_igtk - 4], len);
3197 }
3198 #endif /* CONFIG_IEEE80211W */
3199
3200 return ret;
3201 }
3202
3203
3204 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
3205 struct wpa_group *group)
3206 {
3207 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3208 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
3209 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
3210 group->wpa_group_state = WPA_GROUP_GTK_INIT;
3211
3212 /* GTK[0..N] = 0 */
3213 os_memset(group->GTK, 0, sizeof(group->GTK));
3214 group->GN = 1;
3215 group->GM = 2;
3216 #ifdef CONFIG_IEEE80211W
3217 group->GN_igtk = 4;
3218 group->GM_igtk = 5;
3219 #endif /* CONFIG_IEEE80211W */
3220 /* GTK[GN] = CalcGTK() */
3221 wpa_gtk_update(wpa_auth, group);
3222 }
3223
3224
3225 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
3226 {
3227 if (ctx != NULL && ctx != sm->group)
3228 return 0;
3229
3230 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
3231 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3232 "Not in PTKINITDONE; skip Group Key update");
3233 sm->GUpdateStationKeys = FALSE;
3234 return 0;
3235 }
3236 if (sm->GUpdateStationKeys) {
3237 /*
3238 * This should not really happen, so add a debug log entry.
3239 * Since we clear the GKeyDoneStations before the loop, the
3240 * station needs to be counted here anyway.
3241 */
3242 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3243 "GUpdateStationKeys was already set when "
3244 "marking station for GTK rekeying");
3245 }
3246
3247 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
3248 if (sm->is_wnmsleep)
3249 return 0;
3250
3251 sm->group->GKeyDoneStations++;
3252 sm->GUpdateStationKeys = TRUE;
3253
3254 wpa_sm_step(sm);
3255 return 0;
3256 }
3257
3258
3259 #ifdef CONFIG_WNM
3260 /* update GTK when exiting WNM-Sleep Mode */
3261 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
3262 {
3263 if (sm == NULL || sm->is_wnmsleep)
3264 return;
3265
3266 wpa_group_update_sta(sm, NULL);
3267 }
3268
3269
3270 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
3271 {
3272 if (sm)
3273 sm->is_wnmsleep = !!flag;
3274 }
3275
3276
3277 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3278 {
3279 struct wpa_group *gsm = sm->group;
3280 u8 *start = pos;
3281
3282 /*
3283 * GTK subelement:
3284 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
3285 * Key[5..32]
3286 */
3287 *pos++ = WNM_SLEEP_SUBELEM_GTK;
3288 *pos++ = 11 + gsm->GTK_len;
3289 /* Key ID in B0-B1 of Key Info */
3290 WPA_PUT_LE16(pos, gsm->GN & 0x03);
3291 pos += 2;
3292 *pos++ = gsm->GTK_len;
3293 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
3294 return 0;
3295 pos += 8;
3296 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3297 pos += gsm->GTK_len;
3298
3299 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
3300 gsm->GN);
3301 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
3302 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3303
3304 return pos - start;
3305 }
3306
3307
3308 #ifdef CONFIG_IEEE80211W
3309 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3310 {
3311 struct wpa_group *gsm = sm->group;
3312 u8 *start = pos;
3313 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3314
3315 /*
3316 * IGTK subelement:
3317 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
3318 */
3319 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
3320 *pos++ = 2 + 6 + len;
3321 WPA_PUT_LE16(pos, gsm->GN_igtk);
3322 pos += 2;
3323 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
3324 return 0;
3325 pos += 6;
3326
3327 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
3328 pos += len;
3329
3330 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
3331 gsm->GN_igtk);
3332 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
3333 gsm->IGTK[gsm->GN_igtk - 4], len);
3334
3335 return pos - start;
3336 }
3337 #endif /* CONFIG_IEEE80211W */
3338 #endif /* CONFIG_WNM */
3339
3340
3341 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3342 struct wpa_group *group)
3343 {
3344 int tmp;
3345
3346 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3347 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3348 group->changed = TRUE;
3349 group->wpa_group_state = WPA_GROUP_SETKEYS;
3350 group->GTKReKey = FALSE;
3351 tmp = group->GM;
3352 group->GM = group->GN;
3353 group->GN = tmp;
3354 #ifdef CONFIG_IEEE80211W
3355 tmp = group->GM_igtk;
3356 group->GM_igtk = group->GN_igtk;
3357 group->GN_igtk = tmp;
3358 #endif /* CONFIG_IEEE80211W */
3359 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3360 * counting the STAs that are marked with GUpdateStationKeys instead of
3361 * including all STAs that could be in not-yet-completed state. */
3362 wpa_gtk_update(wpa_auth, group);
3363
3364 if (group->GKeyDoneStations) {
3365 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3366 "GKeyDoneStations=%d when starting new GTK rekey",
3367 group->GKeyDoneStations);
3368 group->GKeyDoneStations = 0;
3369 }
3370 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3371 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3372 group->GKeyDoneStations);
3373 }
3374
3375
3376 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3377 struct wpa_group *group)
3378 {
3379 int ret = 0;
3380
3381 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3382 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3383 broadcast_ether_addr, group->GN,
3384 group->GTK[group->GN - 1], group->GTK_len) < 0)
3385 ret = -1;
3386
3387 #ifdef CONFIG_IEEE80211W
3388 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3389 enum wpa_alg alg;
3390 size_t len;
3391
3392 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3393 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3394
3395 if (ret == 0 &&
3396 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3397 broadcast_ether_addr, group->GN_igtk,
3398 group->IGTK[group->GN_igtk - 4], len) < 0)
3399 ret = -1;
3400 }
3401 #endif /* CONFIG_IEEE80211W */
3402
3403 return ret;
3404 }
3405
3406
3407 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3408 {
3409 if (sm->group == ctx) {
3410 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3411 " for discconnection due to fatal failure",
3412 MAC2STR(sm->addr));
3413 sm->Disconnect = TRUE;
3414 }
3415
3416 return 0;
3417 }
3418
3419
3420 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3421 struct wpa_group *group)
3422 {
3423 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3424 group->changed = TRUE;
3425 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3426 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3427 }
3428
3429
3430 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3431 struct wpa_group *group)
3432 {
3433 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3434 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3435 group->changed = TRUE;
3436 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
3437
3438 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
3439 wpa_group_fatal_failure(wpa_auth, group);
3440 return -1;
3441 }
3442
3443 return 0;
3444 }
3445
3446
3447 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
3448 struct wpa_group *group)
3449 {
3450 if (group->GInit) {
3451 wpa_group_gtk_init(wpa_auth, group);
3452 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
3453 /* Do not allow group operations */
3454 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
3455 group->GTKAuthenticator) {
3456 wpa_group_setkeysdone(wpa_auth, group);
3457 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
3458 group->GTKReKey) {
3459 wpa_group_setkeys(wpa_auth, group);
3460 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
3461 if (group->GKeyDoneStations == 0)
3462 wpa_group_setkeysdone(wpa_auth, group);
3463 else if (group->GTKReKey)
3464 wpa_group_setkeys(wpa_auth, group);
3465 }
3466 }
3467
3468
3469 static int wpa_sm_step(struct wpa_state_machine *sm)
3470 {
3471 if (sm == NULL)
3472 return 0;
3473
3474 if (sm->in_step_loop) {
3475 /* This should not happen, but if it does, make sure we do not
3476 * end up freeing the state machine too early by exiting the
3477 * recursive call. */
3478 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
3479 return 0;
3480 }
3481
3482 sm->in_step_loop = 1;
3483 do {
3484 if (sm->pending_deinit)
3485 break;
3486
3487 sm->changed = FALSE;
3488 sm->wpa_auth->group->changed = FALSE;
3489
3490 SM_STEP_RUN(WPA_PTK);
3491 if (sm->pending_deinit)
3492 break;
3493 SM_STEP_RUN(WPA_PTK_GROUP);
3494 if (sm->pending_deinit)
3495 break;
3496 wpa_group_sm_step(sm->wpa_auth, sm->group);
3497 } while (sm->changed || sm->wpa_auth->group->changed);
3498 sm->in_step_loop = 0;
3499
3500 if (sm->pending_deinit) {
3501 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
3502 "machine deinit for " MACSTR, MAC2STR(sm->addr));
3503 wpa_free_sta_sm(sm);
3504 return 1;
3505 }
3506 return 0;
3507 }
3508
3509
3510 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
3511 {
3512 struct wpa_state_machine *sm = eloop_ctx;
3513 wpa_sm_step(sm);
3514 }
3515
3516
3517 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
3518 {
3519 if (sm == NULL)
3520 return;
3521 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
3522 }
3523
3524
3525 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
3526 {
3527 int tmp, i;
3528 struct wpa_group *group;
3529
3530 if (wpa_auth == NULL)
3531 return;
3532
3533 group = wpa_auth->group;
3534
3535 for (i = 0; i < 2; i++) {
3536 tmp = group->GM;
3537 group->GM = group->GN;
3538 group->GN = tmp;
3539 #ifdef CONFIG_IEEE80211W
3540 tmp = group->GM_igtk;
3541 group->GM_igtk = group->GN_igtk;
3542 group->GN_igtk = tmp;
3543 #endif /* CONFIG_IEEE80211W */
3544 wpa_gtk_update(wpa_auth, group);
3545 wpa_group_config_group_keys(wpa_auth, group);
3546 }
3547 }
3548
3549
3550 static const char * wpa_bool_txt(int val)
3551 {
3552 return val ? "TRUE" : "FALSE";
3553 }
3554
3555
3556 #define RSN_SUITE "%02x-%02x-%02x-%d"
3557 #define RSN_SUITE_ARG(s) \
3558 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
3559
3560 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
3561 {
3562 int len = 0, ret;
3563 char pmkid_txt[PMKID_LEN * 2 + 1];
3564 #ifdef CONFIG_RSN_PREAUTH
3565 const int preauth = 1;
3566 #else /* CONFIG_RSN_PREAUTH */
3567 const int preauth = 0;
3568 #endif /* CONFIG_RSN_PREAUTH */
3569
3570 if (wpa_auth == NULL)
3571 return len;
3572
3573 ret = os_snprintf(buf + len, buflen - len,
3574 "dot11RSNAOptionImplemented=TRUE\n"
3575 "dot11RSNAPreauthenticationImplemented=%s\n"
3576 "dot11RSNAEnabled=%s\n"
3577 "dot11RSNAPreauthenticationEnabled=%s\n",
3578 wpa_bool_txt(preauth),
3579 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
3580 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
3581 if (os_snprintf_error(buflen - len, ret))
3582 return len;
3583 len += ret;
3584
3585 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
3586 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
3587
3588 ret = os_snprintf(
3589 buf + len, buflen - len,
3590 "dot11RSNAConfigVersion=%u\n"
3591 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
3592 /* FIX: dot11RSNAConfigGroupCipher */
3593 /* FIX: dot11RSNAConfigGroupRekeyMethod */
3594 /* FIX: dot11RSNAConfigGroupRekeyTime */
3595 /* FIX: dot11RSNAConfigGroupRekeyPackets */
3596 "dot11RSNAConfigGroupRekeyStrict=%u\n"
3597 "dot11RSNAConfigGroupUpdateCount=%u\n"
3598 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
3599 "dot11RSNAConfigGroupCipherSize=%u\n"
3600 "dot11RSNAConfigPMKLifetime=%u\n"
3601 "dot11RSNAConfigPMKReauthThreshold=%u\n"
3602 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
3603 "dot11RSNAConfigSATimeout=%u\n"
3604 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
3605 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
3606 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
3607 "dot11RSNAPMKIDUsed=%s\n"
3608 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
3609 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
3610 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
3611 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
3612 "dot11RSNA4WayHandshakeFailures=%u\n"
3613 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
3614 RSN_VERSION,
3615 !!wpa_auth->conf.wpa_strict_rekey,
3616 wpa_auth->conf.wpa_group_update_count,
3617 wpa_auth->conf.wpa_pairwise_update_count,
3618 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
3619 dot11RSNAConfigPMKLifetime,
3620 dot11RSNAConfigPMKReauthThreshold,
3621 dot11RSNAConfigSATimeout,
3622 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
3623 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
3624 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
3625 pmkid_txt,
3626 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
3627 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
3628 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
3629 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
3630 wpa_auth->dot11RSNA4WayHandshakeFailures);
3631 if (os_snprintf_error(buflen - len, ret))
3632 return len;
3633 len += ret;
3634
3635 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
3636 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
3637
3638 /* Private MIB */
3639 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
3640 wpa_auth->group->wpa_group_state);
3641 if (os_snprintf_error(buflen - len, ret))
3642 return len;
3643 len += ret;
3644
3645 return len;
3646 }
3647
3648
3649 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
3650 {
3651 int len = 0, ret;
3652 u32 pairwise = 0;
3653
3654 if (sm == NULL)
3655 return 0;
3656
3657 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
3658
3659 /* dot11RSNAStatsEntry */
3660
3661 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
3662 WPA_PROTO_RSN : WPA_PROTO_WPA,
3663 sm->pairwise);
3664 if (pairwise == 0)
3665 return 0;
3666
3667 ret = os_snprintf(
3668 buf + len, buflen - len,
3669 /* TODO: dot11RSNAStatsIndex */
3670 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
3671 "dot11RSNAStatsVersion=1\n"
3672 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
3673 /* TODO: dot11RSNAStatsTKIPICVErrors */
3674 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
3675 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
3676 /* TODO: dot11RSNAStatsCCMPReplays */
3677 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
3678 /* TODO: dot11RSNAStatsTKIPReplays */,
3679 MAC2STR(sm->addr),
3680 RSN_SUITE_ARG(pairwise),
3681 sm->dot11RSNAStatsTKIPLocalMICFailures,
3682 sm->dot11RSNAStatsTKIPRemoteMICFailures);
3683 if (os_snprintf_error(buflen - len, ret))
3684 return len;
3685 len += ret;
3686
3687 /* Private MIB */
3688 ret = os_snprintf(buf + len, buflen - len,
3689 "hostapdWPAPTKState=%d\n"
3690 "hostapdWPAPTKGroupState=%d\n",
3691 sm->wpa_ptk_state,
3692 sm->wpa_ptk_group_state);
3693 if (os_snprintf_error(buflen - len, ret))
3694 return len;
3695 len += ret;
3696
3697 return len;
3698 }
3699
3700
3701 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
3702 {
3703 if (wpa_auth)
3704 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
3705 }
3706
3707
3708 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
3709 {
3710 return sm && sm->pairwise_set;
3711 }
3712
3713
3714 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
3715 {
3716 return sm->pairwise;
3717 }
3718
3719
3720 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3721 {
3722 if (sm == NULL)
3723 return -1;
3724 return sm->wpa_key_mgmt;
3725 }
3726
3727
3728 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3729 {
3730 if (sm == NULL)
3731 return 0;
3732 return sm->wpa;
3733 }
3734
3735
3736 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3737 struct rsn_pmksa_cache_entry *entry)
3738 {
3739 if (sm == NULL || sm->pmksa != entry)
3740 return -1;
3741 sm->pmksa = NULL;
3742 return 0;
3743 }
3744
3745
3746 struct rsn_pmksa_cache_entry *
3747 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3748 {
3749 return sm ? sm->pmksa : NULL;
3750 }
3751
3752
3753 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3754 {
3755 if (sm)
3756 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3757 }
3758
3759
3760 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3761 {
3762 if (wpa_auth == NULL)
3763 return NULL;
3764 *len = wpa_auth->wpa_ie_len;
3765 return wpa_auth->wpa_ie;
3766 }
3767
3768
3769 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3770 unsigned int pmk_len,
3771 int session_timeout, struct eapol_state_machine *eapol)
3772 {
3773 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3774 sm->wpa_auth->conf.disable_pmksa_caching)
3775 return -1;
3776
3777 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
3778 if (pmk_len > PMK_LEN_SUITE_B_192)
3779 pmk_len = PMK_LEN_SUITE_B_192;
3780 } else if (pmk_len > PMK_LEN) {
3781 pmk_len = PMK_LEN;
3782 }
3783
3784 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
3785 sm->PTK.kck, sm->PTK.kck_len,
3786 sm->wpa_auth->addr, sm->addr, session_timeout,
3787 eapol, sm->wpa_key_mgmt))
3788 return 0;
3789
3790 return -1;
3791 }
3792
3793
3794 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3795 const u8 *pmk, size_t len, const u8 *sta_addr,
3796 int session_timeout,
3797 struct eapol_state_machine *eapol)
3798 {
3799 if (wpa_auth == NULL)
3800 return -1;
3801
3802 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
3803 NULL, 0,
3804 wpa_auth->addr,
3805 sta_addr, session_timeout, eapol,
3806 WPA_KEY_MGMT_IEEE8021X))
3807 return 0;
3808
3809 return -1;
3810 }
3811
3812
3813 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
3814 const u8 *pmk, const u8 *pmkid)
3815 {
3816 if (wpa_auth->conf.disable_pmksa_caching)
3817 return -1;
3818
3819 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
3820 NULL, 0,
3821 wpa_auth->addr, addr, 0, NULL,
3822 WPA_KEY_MGMT_SAE))
3823 return 0;
3824
3825 return -1;
3826 }
3827
3828
3829 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3830 const u8 *sta_addr)
3831 {
3832 struct rsn_pmksa_cache_entry *pmksa;
3833
3834 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3835 return;
3836 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3837 if (pmksa) {
3838 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3839 MACSTR " based on request", MAC2STR(sta_addr));
3840 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3841 }
3842 }
3843
3844
3845 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
3846 size_t len)
3847 {
3848 if (!wpa_auth || !wpa_auth->pmksa)
3849 return 0;
3850 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
3851 }
3852
3853
3854 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
3855 {
3856 if (wpa_auth && wpa_auth->pmksa)
3857 pmksa_cache_auth_flush(wpa_auth->pmksa);
3858 }
3859
3860
3861 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
3862 #ifdef CONFIG_MESH
3863
3864 int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
3865 char *buf, size_t len)
3866 {
3867 if (!wpa_auth || !wpa_auth->pmksa)
3868 return 0;
3869
3870 return pmksa_cache_auth_list_mesh(wpa_auth->pmksa, addr, buf, len);
3871 }
3872
3873
3874 struct rsn_pmksa_cache_entry *
3875 wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
3876 const u8 *pmkid, int expiration)
3877 {
3878 struct rsn_pmksa_cache_entry *entry;
3879 struct os_reltime now;
3880
3881 entry = pmksa_cache_auth_create_entry(pmk, PMK_LEN, pmkid, NULL, 0, aa,
3882 spa, 0, NULL, WPA_KEY_MGMT_SAE);
3883 if (!entry)
3884 return NULL;
3885
3886 os_get_reltime(&now);
3887 entry->expiration = now.sec + expiration;
3888 return entry;
3889 }
3890
3891
3892 int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
3893 struct rsn_pmksa_cache_entry *entry)
3894 {
3895 int ret;
3896
3897 if (!wpa_auth || !wpa_auth->pmksa)
3898 return -1;
3899
3900 ret = pmksa_cache_auth_add_entry(wpa_auth->pmksa, entry);
3901 if (ret < 0)
3902 wpa_printf(MSG_DEBUG,
3903 "RSN: Failed to store external PMKSA cache for "
3904 MACSTR, MAC2STR(entry->spa));
3905
3906 return ret;
3907 }
3908
3909 #endif /* CONFIG_MESH */
3910 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
3911
3912
3913 struct rsn_pmksa_cache_entry *
3914 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
3915 const u8 *pmkid)
3916 {
3917 if (!wpa_auth || !wpa_auth->pmksa)
3918 return NULL;
3919 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, pmkid);
3920 }
3921
3922
3923 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
3924 struct wpa_state_machine *sm,
3925 struct wpa_authenticator *wpa_auth,
3926 u8 *pmkid, u8 *pmk)
3927 {
3928 if (!sm)
3929 return;
3930
3931 sm->pmksa = pmksa;
3932 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
3933 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
3934 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
3935 }
3936
3937
3938 /*
3939 * Remove and free the group from wpa_authenticator. This is triggered by a
3940 * callback to make sure nobody is currently iterating the group list while it
3941 * gets modified.
3942 */
3943 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
3944 struct wpa_group *group)
3945 {
3946 struct wpa_group *prev = wpa_auth->group;
3947
3948 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
3949 group->vlan_id);
3950
3951 while (prev) {
3952 if (prev->next == group) {
3953 /* This never frees the special first group as needed */
3954 prev->next = group->next;
3955 os_free(group);
3956 break;
3957 }
3958 prev = prev->next;
3959 }
3960
3961 }
3962
3963
3964 /* Increase the reference counter for group */
3965 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
3966 struct wpa_group *group)
3967 {
3968 /* Skip the special first group */
3969 if (wpa_auth->group == group)
3970 return;
3971
3972 group->references++;
3973 }
3974
3975
3976 /* Decrease the reference counter and maybe free the group */
3977 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
3978 struct wpa_group *group)
3979 {
3980 /* Skip the special first group */
3981 if (wpa_auth->group == group)
3982 return;
3983
3984 group->references--;
3985 if (group->references)
3986 return;
3987 wpa_group_free(wpa_auth, group);
3988 }
3989
3990
3991 /*
3992 * Add a group that has its references counter set to zero. Caller needs to
3993 * call wpa_group_get() on the return value to mark the entry in use.
3994 */
3995 static struct wpa_group *
3996 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3997 {
3998 struct wpa_group *group;
3999
4000 if (wpa_auth == NULL || wpa_auth->group == NULL)
4001 return NULL;
4002
4003 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
4004 vlan_id);
4005 group = wpa_group_init(wpa_auth, vlan_id, 0);
4006 if (group == NULL)
4007 return NULL;
4008
4009 group->next = wpa_auth->group->next;
4010 wpa_auth->group->next = group;
4011
4012 return group;
4013 }
4014
4015
4016 /*
4017 * Enforce that the group state machine for the VLAN is running, increase
4018 * reference counter as interface is up. References might have been increased
4019 * even if a negative value is returned.
4020 * Returns: -1 on error (group missing, group already failed); otherwise, 0
4021 */
4022 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4023 {
4024 struct wpa_group *group;
4025
4026 if (wpa_auth == NULL)
4027 return 0;
4028
4029 group = wpa_auth->group;
4030 while (group) {
4031 if (group->vlan_id == vlan_id)
4032 break;
4033 group = group->next;
4034 }
4035
4036 if (group == NULL) {
4037 group = wpa_auth_add_group(wpa_auth, vlan_id);
4038 if (group == NULL)
4039 return -1;
4040 }
4041
4042 wpa_printf(MSG_DEBUG,
4043 "WPA: Ensure group state machine running for VLAN ID %d",
4044 vlan_id);
4045
4046 wpa_group_get(wpa_auth, group);
4047 group->num_setup_iface++;
4048
4049 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4050 return -1;
4051
4052 return 0;
4053 }
4054
4055
4056 /*
4057 * Decrease reference counter, expected to be zero afterwards.
4058 * returns: -1 on error (group not found, group in fail state)
4059 * -2 if wpa_group is still referenced
4060 * 0 else
4061 */
4062 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4063 {
4064 struct wpa_group *group;
4065 int ret = 0;
4066
4067 if (wpa_auth == NULL)
4068 return 0;
4069
4070 group = wpa_auth->group;
4071 while (group) {
4072 if (group->vlan_id == vlan_id)
4073 break;
4074 group = group->next;
4075 }
4076
4077 if (group == NULL)
4078 return -1;
4079
4080 wpa_printf(MSG_DEBUG,
4081 "WPA: Try stopping group state machine for VLAN ID %d",
4082 vlan_id);
4083
4084 if (group->num_setup_iface <= 0) {
4085 wpa_printf(MSG_ERROR,
4086 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
4087 vlan_id);
4088 return -1;
4089 }
4090 group->num_setup_iface--;
4091
4092 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4093 ret = -1;
4094
4095 if (group->references > 1) {
4096 wpa_printf(MSG_DEBUG,
4097 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
4098 vlan_id);
4099 ret = -2;
4100 }
4101
4102 wpa_group_put(wpa_auth, group);
4103
4104 return ret;
4105 }
4106
4107
4108 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
4109 {
4110 struct wpa_group *group;
4111
4112 if (sm == NULL || sm->wpa_auth == NULL)
4113 return 0;
4114
4115 group = sm->wpa_auth->group;
4116 while (group) {
4117 if (group->vlan_id == vlan_id)
4118 break;
4119 group = group->next;
4120 }
4121
4122 if (group == NULL) {
4123 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
4124 if (group == NULL)
4125 return -1;
4126 }
4127
4128 if (sm->group == group)
4129 return 0;
4130
4131 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4132 return -1;
4133
4134 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
4135 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
4136
4137 wpa_group_get(sm->wpa_auth, group);
4138 wpa_group_put(sm->wpa_auth, sm->group);
4139 sm->group = group;
4140
4141 return 0;
4142 }
4143
4144
4145 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
4146 struct wpa_state_machine *sm, int ack)
4147 {
4148 if (wpa_auth == NULL || sm == NULL)
4149 return;
4150 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
4151 " ack=%d", MAC2STR(sm->addr), ack);
4152 if (sm->pending_1_of_4_timeout && ack) {
4153 /*
4154 * Some deployed supplicant implementations update their SNonce
4155 * for each EAPOL-Key 2/4 message even within the same 4-way
4156 * handshake and then fail to use the first SNonce when
4157 * deriving the PTK. This results in unsuccessful 4-way
4158 * handshake whenever the relatively short initial timeout is
4159 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
4160 * around this by increasing the timeout now that we know that
4161 * the station has received the frame.
4162 */
4163 int timeout_ms = eapol_key_timeout_subseq;
4164 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
4165 "timeout by %u ms because of acknowledged frame",
4166 timeout_ms);
4167 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
4168 eloop_register_timeout(timeout_ms / 1000,
4169 (timeout_ms % 1000) * 1000,
4170 wpa_send_eapol_timeout, wpa_auth, sm);
4171 }
4172 }
4173
4174
4175 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
4176 {
4177 if (sm == NULL)
4178 return 0;
4179 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
4180 }
4181
4182
4183 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
4184 {
4185 if (sm == NULL)
4186 return 0;
4187 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
4188 }
4189
4190
4191 #ifdef CONFIG_P2P
4192 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
4193 {
4194 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
4195 return -1;
4196 os_memcpy(addr, sm->ip_addr, 4);
4197 return 0;
4198 }
4199 #endif /* CONFIG_P2P */
4200
4201
4202 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
4203 struct radius_das_attrs *attr)
4204 {
4205 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
4206 }
4207
4208
4209 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
4210 {
4211 struct wpa_group *group;
4212
4213 if (!wpa_auth)
4214 return;
4215 for (group = wpa_auth->group; group; group = group->next)
4216 wpa_group_config_group_keys(wpa_auth, group);
4217 }
4218
4219
4220 #ifdef CONFIG_FILS
4221
4222 struct wpa_auth_fils_iter_data {
4223 struct wpa_authenticator *auth;
4224 const u8 *cache_id;
4225 struct rsn_pmksa_cache_entry *pmksa;
4226 const u8 *spa;
4227 const u8 *pmkid;
4228 };
4229
4230
4231 static int wpa_auth_fils_iter(struct wpa_authenticator *a, void *ctx)
4232 {
4233 struct wpa_auth_fils_iter_data *data = ctx;
4234
4235 if (a == data->auth || !a->conf.fils_cache_id ||
4236 os_memcmp(a->conf.fils_cache_id, data->cache_id,
4237 FILS_CACHE_ID_LEN) != 0)
4238 return 0;
4239 data->pmksa = pmksa_cache_auth_get(a->pmksa, data->spa, data->pmkid);
4240 return data->pmksa != NULL;
4241 }
4242
4243
4244 struct rsn_pmksa_cache_entry *
4245 wpa_auth_pmksa_get_fils_cache_id(struct wpa_authenticator *wpa_auth,
4246 const u8 *sta_addr, const u8 *pmkid)
4247 {
4248 struct wpa_auth_fils_iter_data idata;
4249
4250 if (!wpa_auth->conf.fils_cache_id_set)
4251 return NULL;
4252 idata.auth = wpa_auth;
4253 idata.cache_id = wpa_auth->conf.fils_cache_id;
4254 idata.pmksa = NULL;
4255 idata.spa = sta_addr;
4256 idata.pmkid = pmkid;
4257 wpa_auth_for_each_auth(wpa_auth, wpa_auth_fils_iter, &idata);
4258 return idata.pmksa;
4259 }
4260
4261 #endif /* CONFIG_FILS */
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