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FILS: Fix AES-SIV AAD for (Re)Association Request frame decryption
[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 dot11RSNAConfigGroupUpdateCount = 4;
64 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
65 static const u32 eapol_key_timeout_first = 100; /* ms */
66 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
67 static const u32 eapol_key_timeout_first_group = 500; /* ms */
68
69 /* TODO: make these configurable */
70 static const int dot11RSNAConfigPMKLifetime = 43200;
71 static const int dot11RSNAConfigPMKReauthThreshold = 70;
72 static const int dot11RSNAConfigSATimeout = 60;
73
74
75 static inline int wpa_auth_mic_failure_report(
76 struct wpa_authenticator *wpa_auth, const u8 *addr)
77 {
78 if (wpa_auth->cb->mic_failure_report)
79 return wpa_auth->cb->mic_failure_report(wpa_auth->cb_ctx, addr);
80 return 0;
81 }
82
83
84 static inline void wpa_auth_psk_failure_report(
85 struct wpa_authenticator *wpa_auth, const u8 *addr)
86 {
87 if (wpa_auth->cb->psk_failure_report)
88 wpa_auth->cb->psk_failure_report(wpa_auth->cb_ctx, addr);
89 }
90
91
92 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
93 const u8 *addr, wpa_eapol_variable var,
94 int value)
95 {
96 if (wpa_auth->cb->set_eapol)
97 wpa_auth->cb->set_eapol(wpa_auth->cb_ctx, addr, var, value);
98 }
99
100
101 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
102 const u8 *addr, wpa_eapol_variable var)
103 {
104 if (wpa_auth->cb->get_eapol == NULL)
105 return -1;
106 return wpa_auth->cb->get_eapol(wpa_auth->cb_ctx, addr, var);
107 }
108
109
110 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
111 const u8 *addr,
112 const u8 *p2p_dev_addr,
113 const u8 *prev_psk)
114 {
115 if (wpa_auth->cb->get_psk == NULL)
116 return NULL;
117 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
118 prev_psk);
119 }
120
121
122 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
123 const u8 *addr, u8 *msk, size_t *len)
124 {
125 if (wpa_auth->cb->get_msk == NULL)
126 return -1;
127 return wpa_auth->cb->get_msk(wpa_auth->cb_ctx, addr, msk, len);
128 }
129
130
131 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
132 int vlan_id,
133 enum wpa_alg alg, const u8 *addr, int idx,
134 u8 *key, size_t key_len)
135 {
136 if (wpa_auth->cb->set_key == NULL)
137 return -1;
138 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
139 key, key_len);
140 }
141
142
143 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
144 const u8 *addr, int idx, u8 *seq)
145 {
146 if (wpa_auth->cb->get_seqnum == NULL)
147 return -1;
148 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
149 }
150
151
152 static inline int
153 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
154 const u8 *data, size_t data_len, int encrypt)
155 {
156 if (wpa_auth->cb->send_eapol == NULL)
157 return -1;
158 return wpa_auth->cb->send_eapol(wpa_auth->cb_ctx, addr, data, data_len,
159 encrypt);
160 }
161
162
163 #ifdef CONFIG_MESH
164 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
165 const u8 *addr)
166 {
167 if (wpa_auth->cb->start_ampe == NULL)
168 return -1;
169 return wpa_auth->cb->start_ampe(wpa_auth->cb_ctx, addr);
170 }
171 #endif /* CONFIG_MESH */
172
173
174 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
175 int (*cb)(struct wpa_state_machine *sm, void *ctx),
176 void *cb_ctx)
177 {
178 if (wpa_auth->cb->for_each_sta == NULL)
179 return 0;
180 return wpa_auth->cb->for_each_sta(wpa_auth->cb_ctx, cb, cb_ctx);
181 }
182
183
184 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
185 int (*cb)(struct wpa_authenticator *a, void *ctx),
186 void *cb_ctx)
187 {
188 if (wpa_auth->cb->for_each_auth == NULL)
189 return 0;
190 return wpa_auth->cb->for_each_auth(wpa_auth->cb_ctx, cb, cb_ctx);
191 }
192
193
194 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
195 logger_level level, const char *txt)
196 {
197 if (wpa_auth->cb->logger == NULL)
198 return;
199 wpa_auth->cb->logger(wpa_auth->cb_ctx, addr, level, txt);
200 }
201
202
203 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
204 logger_level level, const char *fmt, ...)
205 {
206 char *format;
207 int maxlen;
208 va_list ap;
209
210 if (wpa_auth->cb->logger == NULL)
211 return;
212
213 maxlen = os_strlen(fmt) + 100;
214 format = os_malloc(maxlen);
215 if (!format)
216 return;
217
218 va_start(ap, fmt);
219 vsnprintf(format, maxlen, fmt, ap);
220 va_end(ap);
221
222 wpa_auth_logger(wpa_auth, addr, level, format);
223
224 os_free(format);
225 }
226
227
228 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
229 const u8 *addr)
230 {
231 if (wpa_auth->cb->disconnect == NULL)
232 return;
233 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
234 wpa_auth->cb->disconnect(wpa_auth->cb_ctx, addr,
235 WLAN_REASON_PREV_AUTH_NOT_VALID);
236 }
237
238
239 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
240 {
241 int ret = 0;
242 #ifdef CONFIG_IEEE80211R_AP
243 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
244 ret = 1;
245 #endif /* CONFIG_IEEE80211R_AP */
246 #ifdef CONFIG_IEEE80211W
247 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
248 ret = 1;
249 #endif /* CONFIG_IEEE80211W */
250 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
251 ret = 1;
252 return ret;
253 }
254
255
256 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
257 {
258 struct wpa_authenticator *wpa_auth = eloop_ctx;
259
260 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
261 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
262 "initialization.");
263 } else {
264 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
265 wpa_hexdump_key(MSG_DEBUG, "GMK",
266 wpa_auth->group->GMK, WPA_GMK_LEN);
267 }
268
269 if (wpa_auth->conf.wpa_gmk_rekey) {
270 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
271 wpa_rekey_gmk, wpa_auth, NULL);
272 }
273 }
274
275
276 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
277 {
278 struct wpa_authenticator *wpa_auth = eloop_ctx;
279 struct wpa_group *group, *next;
280
281 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
282 group = wpa_auth->group;
283 while (group) {
284 wpa_group_get(wpa_auth, group);
285
286 group->GTKReKey = TRUE;
287 do {
288 group->changed = FALSE;
289 wpa_group_sm_step(wpa_auth, group);
290 } while (group->changed);
291
292 next = group->next;
293 wpa_group_put(wpa_auth, group);
294 group = next;
295 }
296
297 if (wpa_auth->conf.wpa_group_rekey) {
298 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
299 0, wpa_rekey_gtk, wpa_auth, NULL);
300 }
301 }
302
303
304 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
305 {
306 struct wpa_authenticator *wpa_auth = eloop_ctx;
307 struct wpa_state_machine *sm = timeout_ctx;
308
309 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
310 wpa_request_new_ptk(sm);
311 wpa_sm_step(sm);
312 }
313
314
315 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
316 {
317 if (sm->pmksa == ctx)
318 sm->pmksa = NULL;
319 return 0;
320 }
321
322
323 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
324 void *ctx)
325 {
326 struct wpa_authenticator *wpa_auth = ctx;
327 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
328 }
329
330
331 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
332 struct wpa_group *group)
333 {
334 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
335 u8 rkey[32];
336 unsigned long ptr;
337
338 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
339 return -1;
340 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
341
342 /*
343 * Counter = PRF-256(Random number, "Init Counter",
344 * Local MAC Address || Time)
345 */
346 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
347 wpa_get_ntp_timestamp(buf + ETH_ALEN);
348 ptr = (unsigned long) group;
349 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
350 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
351 return -1;
352
353 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
354 group->Counter, WPA_NONCE_LEN) < 0)
355 return -1;
356 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
357 group->Counter, WPA_NONCE_LEN);
358
359 return 0;
360 }
361
362
363 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
364 int vlan_id, int delay_init)
365 {
366 struct wpa_group *group;
367
368 group = os_zalloc(sizeof(struct wpa_group));
369 if (group == NULL)
370 return NULL;
371
372 group->GTKAuthenticator = TRUE;
373 group->vlan_id = vlan_id;
374 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
375
376 if (random_pool_ready() != 1) {
377 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
378 "for secure operations - update keys later when "
379 "the first station connects");
380 }
381
382 /*
383 * Set initial GMK/Counter value here. The actual values that will be
384 * used in negotiations will be set once the first station tries to
385 * connect. This allows more time for collecting additional randomness
386 * on embedded devices.
387 */
388 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
389 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
390 "initialization.");
391 os_free(group);
392 return NULL;
393 }
394
395 group->GInit = TRUE;
396 if (delay_init) {
397 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
398 "until Beacon frames have been configured");
399 /* Initialization is completed in wpa_init_keys(). */
400 } else {
401 wpa_group_sm_step(wpa_auth, group);
402 group->GInit = FALSE;
403 wpa_group_sm_step(wpa_auth, group);
404 }
405
406 return group;
407 }
408
409
410 /**
411 * wpa_init - Initialize WPA authenticator
412 * @addr: Authenticator address
413 * @conf: Configuration for WPA authenticator
414 * @cb: Callback functions for WPA authenticator
415 * Returns: Pointer to WPA authenticator data or %NULL on failure
416 */
417 struct wpa_authenticator * wpa_init(const u8 *addr,
418 struct wpa_auth_config *conf,
419 const struct wpa_auth_callbacks *cb,
420 void *cb_ctx)
421 {
422 struct wpa_authenticator *wpa_auth;
423
424 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
425 if (wpa_auth == NULL)
426 return NULL;
427 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
428 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
429 wpa_auth->cb = cb;
430 wpa_auth->cb_ctx = cb_ctx;
431
432 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
433 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
434 os_free(wpa_auth);
435 return NULL;
436 }
437
438 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
439 if (wpa_auth->group == NULL) {
440 os_free(wpa_auth->wpa_ie);
441 os_free(wpa_auth);
442 return NULL;
443 }
444
445 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
446 wpa_auth);
447 if (wpa_auth->pmksa == NULL) {
448 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
449 os_free(wpa_auth->group);
450 os_free(wpa_auth->wpa_ie);
451 os_free(wpa_auth);
452 return NULL;
453 }
454
455 #ifdef CONFIG_IEEE80211R_AP
456 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
457 if (wpa_auth->ft_pmk_cache == NULL) {
458 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
459 os_free(wpa_auth->group);
460 os_free(wpa_auth->wpa_ie);
461 pmksa_cache_auth_deinit(wpa_auth->pmksa);
462 os_free(wpa_auth);
463 return NULL;
464 }
465 #endif /* CONFIG_IEEE80211R_AP */
466
467 if (wpa_auth->conf.wpa_gmk_rekey) {
468 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
469 wpa_rekey_gmk, wpa_auth, NULL);
470 }
471
472 if (wpa_auth->conf.wpa_group_rekey) {
473 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
474 wpa_rekey_gtk, wpa_auth, NULL);
475 }
476
477 #ifdef CONFIG_P2P
478 if (WPA_GET_BE32(conf->ip_addr_start)) {
479 int count = WPA_GET_BE32(conf->ip_addr_end) -
480 WPA_GET_BE32(conf->ip_addr_start) + 1;
481 if (count > 1000)
482 count = 1000;
483 if (count > 0)
484 wpa_auth->ip_pool = bitfield_alloc(count);
485 }
486 #endif /* CONFIG_P2P */
487
488 return wpa_auth;
489 }
490
491
492 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
493 {
494 struct wpa_group *group = wpa_auth->group;
495
496 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
497 "keys");
498 wpa_group_sm_step(wpa_auth, group);
499 group->GInit = FALSE;
500 wpa_group_sm_step(wpa_auth, group);
501 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
502 return -1;
503 return 0;
504 }
505
506
507 /**
508 * wpa_deinit - Deinitialize WPA authenticator
509 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
510 */
511 void wpa_deinit(struct wpa_authenticator *wpa_auth)
512 {
513 struct wpa_group *group, *prev;
514
515 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
516 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
517
518 #ifdef CONFIG_PEERKEY
519 while (wpa_auth->stsl_negotiations)
520 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
521 #endif /* CONFIG_PEERKEY */
522
523 pmksa_cache_auth_deinit(wpa_auth->pmksa);
524
525 #ifdef CONFIG_IEEE80211R_AP
526 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
527 wpa_auth->ft_pmk_cache = NULL;
528 #endif /* CONFIG_IEEE80211R_AP */
529
530 #ifdef CONFIG_P2P
531 bitfield_free(wpa_auth->ip_pool);
532 #endif /* CONFIG_P2P */
533
534
535 os_free(wpa_auth->wpa_ie);
536
537 group = wpa_auth->group;
538 while (group) {
539 prev = group;
540 group = group->next;
541 os_free(prev);
542 }
543
544 os_free(wpa_auth);
545 }
546
547
548 /**
549 * wpa_reconfig - Update WPA authenticator configuration
550 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
551 * @conf: Configuration for WPA authenticator
552 */
553 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
554 struct wpa_auth_config *conf)
555 {
556 struct wpa_group *group;
557 if (wpa_auth == NULL)
558 return 0;
559
560 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
561 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
562 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
563 return -1;
564 }
565
566 /*
567 * Reinitialize GTK to make sure it is suitable for the new
568 * configuration.
569 */
570 group = wpa_auth->group;
571 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
572 group->GInit = TRUE;
573 wpa_group_sm_step(wpa_auth, group);
574 group->GInit = FALSE;
575 wpa_group_sm_step(wpa_auth, group);
576
577 return 0;
578 }
579
580
581 struct wpa_state_machine *
582 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
583 const u8 *p2p_dev_addr)
584 {
585 struct wpa_state_machine *sm;
586
587 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
588 return NULL;
589
590 sm = os_zalloc(sizeof(struct wpa_state_machine));
591 if (sm == NULL)
592 return NULL;
593 os_memcpy(sm->addr, addr, ETH_ALEN);
594 if (p2p_dev_addr)
595 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
596
597 sm->wpa_auth = wpa_auth;
598 sm->group = wpa_auth->group;
599 wpa_group_get(sm->wpa_auth, sm->group);
600
601 return sm;
602 }
603
604
605 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
606 struct wpa_state_machine *sm)
607 {
608 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
609 return -1;
610
611 #ifdef CONFIG_IEEE80211R_AP
612 if (sm->ft_completed) {
613 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
614 "FT authentication already completed - do not "
615 "start 4-way handshake");
616 /* Go to PTKINITDONE state to allow GTK rekeying */
617 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
618 return 0;
619 }
620 #endif /* CONFIG_IEEE80211R_AP */
621
622 #ifdef CONFIG_FILS
623 if (sm->fils_completed) {
624 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
625 "FILS authentication already completed - do not start 4-way handshake");
626 /* Go to PTKINITDONE state to allow GTK rekeying */
627 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
628 return 0;
629 }
630 #endif /* CONFIG_FILS */
631
632 if (sm->started) {
633 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
634 sm->ReAuthenticationRequest = TRUE;
635 return wpa_sm_step(sm);
636 }
637
638 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
639 "start authentication");
640 sm->started = 1;
641
642 sm->Init = TRUE;
643 if (wpa_sm_step(sm) == 1)
644 return 1; /* should not really happen */
645 sm->Init = FALSE;
646 sm->AuthenticationRequest = TRUE;
647 return wpa_sm_step(sm);
648 }
649
650
651 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
652 {
653 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
654 * reassociates back to the same AP while the previous entry for the
655 * STA has not yet been removed. */
656 if (sm == NULL)
657 return;
658
659 sm->wpa_key_mgmt = 0;
660 }
661
662
663 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
664 {
665 #ifdef CONFIG_P2P
666 if (WPA_GET_BE32(sm->ip_addr)) {
667 u32 start;
668 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
669 "address %u.%u.%u.%u from " MACSTR,
670 sm->ip_addr[0], sm->ip_addr[1],
671 sm->ip_addr[2], sm->ip_addr[3],
672 MAC2STR(sm->addr));
673 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
674 bitfield_clear(sm->wpa_auth->ip_pool,
675 WPA_GET_BE32(sm->ip_addr) - start);
676 }
677 #endif /* CONFIG_P2P */
678 if (sm->GUpdateStationKeys) {
679 sm->group->GKeyDoneStations--;
680 sm->GUpdateStationKeys = FALSE;
681 }
682 #ifdef CONFIG_IEEE80211R_AP
683 os_free(sm->assoc_resp_ftie);
684 wpabuf_free(sm->ft_pending_req_ies);
685 #endif /* CONFIG_IEEE80211R_AP */
686 os_free(sm->last_rx_eapol_key);
687 os_free(sm->wpa_ie);
688 wpa_group_put(sm->wpa_auth, sm->group);
689 os_free(sm);
690 }
691
692
693 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
694 {
695 if (sm == NULL)
696 return;
697
698 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
699 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
700 "strict rekeying - force GTK rekey since STA "
701 "is leaving");
702 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
703 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
704 NULL);
705 }
706
707 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
708 sm->pending_1_of_4_timeout = 0;
709 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
710 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
711 if (sm->in_step_loop) {
712 /* Must not free state machine while wpa_sm_step() is running.
713 * Freeing will be completed in the end of wpa_sm_step(). */
714 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
715 "machine deinit for " MACSTR, MAC2STR(sm->addr));
716 sm->pending_deinit = 1;
717 } else
718 wpa_free_sta_sm(sm);
719 }
720
721
722 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
723 {
724 if (sm == NULL)
725 return;
726
727 sm->PTKRequest = TRUE;
728 sm->PTK_valid = 0;
729 }
730
731
732 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
733 const u8 *replay_counter)
734 {
735 int i;
736 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
737 if (!ctr[i].valid)
738 break;
739 if (os_memcmp(replay_counter, ctr[i].counter,
740 WPA_REPLAY_COUNTER_LEN) == 0)
741 return 1;
742 }
743 return 0;
744 }
745
746
747 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
748 const u8 *replay_counter)
749 {
750 int i;
751 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
752 if (ctr[i].valid &&
753 (replay_counter == NULL ||
754 os_memcmp(replay_counter, ctr[i].counter,
755 WPA_REPLAY_COUNTER_LEN) == 0))
756 ctr[i].valid = FALSE;
757 }
758 }
759
760
761 #ifdef CONFIG_IEEE80211R_AP
762 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
763 struct wpa_state_machine *sm,
764 struct wpa_eapol_ie_parse *kde)
765 {
766 struct wpa_ie_data ie;
767 struct rsn_mdie *mdie;
768
769 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
770 ie.num_pmkid != 1 || ie.pmkid == NULL) {
771 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
772 "FT 4-way handshake message 2/4");
773 return -1;
774 }
775
776 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
777 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
778 sm->sup_pmk_r1_name, PMKID_LEN);
779
780 if (!kde->mdie || !kde->ftie) {
781 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
782 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
783 return -1;
784 }
785
786 mdie = (struct rsn_mdie *) (kde->mdie + 2);
787 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
788 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
789 MOBILITY_DOMAIN_ID_LEN) != 0) {
790 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
791 return -1;
792 }
793
794 if (sm->assoc_resp_ftie &&
795 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
796 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
797 2 + sm->assoc_resp_ftie[1]) != 0)) {
798 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
799 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
800 kde->ftie, kde->ftie_len);
801 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
802 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
803 return -1;
804 }
805
806 return 0;
807 }
808 #endif /* CONFIG_IEEE80211R_AP */
809
810
811 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
812 struct wpa_state_machine *sm, int group)
813 {
814 /* Supplicant reported a Michael MIC error */
815 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
816 "received EAPOL-Key Error Request "
817 "(STA detected Michael MIC failure (group=%d))",
818 group);
819
820 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
821 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
822 "ignore Michael MIC failure report since "
823 "group cipher is not TKIP");
824 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
825 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
826 "ignore Michael MIC failure report since "
827 "pairwise cipher is not TKIP");
828 } else {
829 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
830 return 1; /* STA entry was removed */
831 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
832 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
833 }
834
835 /*
836 * Error report is not a request for a new key handshake, but since
837 * Authenticator may do it, let's change the keys now anyway.
838 */
839 wpa_request_new_ptk(sm);
840 return 0;
841 }
842
843
844 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
845 size_t data_len)
846 {
847 struct wpa_ptk PTK;
848 int ok = 0;
849 const u8 *pmk = NULL;
850 unsigned int pmk_len;
851
852 os_memset(&PTK, 0, sizeof(PTK));
853 for (;;) {
854 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
855 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
856 sm->p2p_dev_addr, pmk);
857 if (pmk == NULL)
858 break;
859 pmk_len = PMK_LEN;
860 } else {
861 pmk = sm->PMK;
862 pmk_len = sm->pmk_len;
863 }
864
865 wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK);
866
867 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
868 == 0) {
869 ok = 1;
870 break;
871 }
872
873 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
874 break;
875 }
876
877 if (!ok) {
878 wpa_printf(MSG_DEBUG,
879 "WPA: Earlier SNonce did not result in matching MIC");
880 return -1;
881 }
882
883 wpa_printf(MSG_DEBUG,
884 "WPA: Earlier SNonce resulted in matching MIC");
885 sm->alt_snonce_valid = 0;
886 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
887 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
888 sm->PTK_valid = TRUE;
889
890 return 0;
891 }
892
893
894 void wpa_receive(struct wpa_authenticator *wpa_auth,
895 struct wpa_state_machine *sm,
896 u8 *data, size_t data_len)
897 {
898 struct ieee802_1x_hdr *hdr;
899 struct wpa_eapol_key *key;
900 u16 key_info, key_data_length;
901 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
902 SMK_M1, SMK_M3, SMK_ERROR } msg;
903 char *msgtxt;
904 struct wpa_eapol_ie_parse kde;
905 const u8 *key_data;
906 size_t keyhdrlen, mic_len;
907 u8 *mic;
908
909 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
910 return;
911 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
912
913 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
914 keyhdrlen = sizeof(*key) + mic_len + 2;
915
916 if (data_len < sizeof(*hdr) + keyhdrlen) {
917 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
918 return;
919 }
920
921 hdr = (struct ieee802_1x_hdr *) data;
922 key = (struct wpa_eapol_key *) (hdr + 1);
923 mic = (u8 *) (key + 1);
924 key_info = WPA_GET_BE16(key->key_info);
925 key_data = mic + mic_len + 2;
926 key_data_length = WPA_GET_BE16(mic + mic_len);
927 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
928 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
929 MAC2STR(sm->addr), key_info, key->type,
930 (unsigned int) mic_len, key_data_length);
931 wpa_hexdump(MSG_MSGDUMP,
932 "WPA: EAPOL-Key header (ending before Key MIC)",
933 key, sizeof(*key));
934 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
935 mic, mic_len);
936 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
937 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
938 "key_data overflow (%d > %lu)",
939 key_data_length,
940 (unsigned long) (data_len - sizeof(*hdr) -
941 keyhdrlen));
942 return;
943 }
944
945 if (sm->wpa == WPA_VERSION_WPA2) {
946 if (key->type == EAPOL_KEY_TYPE_WPA) {
947 /*
948 * Some deployed station implementations seem to send
949 * msg 4/4 with incorrect type value in WPA2 mode.
950 */
951 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
952 "with unexpected WPA type in RSN mode");
953 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
954 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
955 "unexpected type %d in RSN mode",
956 key->type);
957 return;
958 }
959 } else {
960 if (key->type != EAPOL_KEY_TYPE_WPA) {
961 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
962 "unexpected type %d in WPA mode",
963 key->type);
964 return;
965 }
966 }
967
968 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
969 WPA_NONCE_LEN);
970 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
971 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
972
973 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
974 * are set */
975
976 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
977 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
978 if (key_info & WPA_KEY_INFO_ERROR) {
979 msg = SMK_ERROR;
980 msgtxt = "SMK Error";
981 } else {
982 msg = SMK_M1;
983 msgtxt = "SMK M1";
984 }
985 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
986 msg = SMK_M3;
987 msgtxt = "SMK M3";
988 } else if (key_info & WPA_KEY_INFO_REQUEST) {
989 msg = REQUEST;
990 msgtxt = "Request";
991 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
992 msg = GROUP_2;
993 msgtxt = "2/2 Group";
994 } else if (key_data_length == 0 ||
995 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
996 key_data_length == AES_BLOCK_SIZE)) {
997 msg = PAIRWISE_4;
998 msgtxt = "4/4 Pairwise";
999 } else {
1000 msg = PAIRWISE_2;
1001 msgtxt = "2/4 Pairwise";
1002 }
1003
1004 /* TODO: key_info type validation for PeerKey */
1005 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
1006 msg == GROUP_2) {
1007 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1008 if (sm->pairwise == WPA_CIPHER_CCMP ||
1009 sm->pairwise == WPA_CIPHER_GCMP) {
1010 if (wpa_use_aes_cmac(sm) &&
1011 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
1012 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
1013 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1014 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1015 wpa_auth_logger(wpa_auth, sm->addr,
1016 LOGGER_WARNING,
1017 "advertised support for "
1018 "AES-128-CMAC, but did not "
1019 "use it");
1020 return;
1021 }
1022
1023 if (!wpa_use_aes_cmac(sm) &&
1024 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1025 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1026 wpa_auth_logger(wpa_auth, sm->addr,
1027 LOGGER_WARNING,
1028 "did not use HMAC-SHA1-AES "
1029 "with CCMP/GCMP");
1030 return;
1031 }
1032 }
1033
1034 if ((wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1035 wpa_key_mgmt_fils(sm->wpa_key_mgmt)) &&
1036 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1037 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1038 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1039 return;
1040 }
1041 }
1042
1043 if (key_info & WPA_KEY_INFO_REQUEST) {
1044 if (sm->req_replay_counter_used &&
1045 os_memcmp(key->replay_counter, sm->req_replay_counter,
1046 WPA_REPLAY_COUNTER_LEN) <= 0) {
1047 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1048 "received EAPOL-Key request with "
1049 "replayed counter");
1050 return;
1051 }
1052 }
1053
1054 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1055 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1056 int i;
1057
1058 if (msg == PAIRWISE_2 &&
1059 wpa_replay_counter_valid(sm->prev_key_replay,
1060 key->replay_counter) &&
1061 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1062 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1063 {
1064 /*
1065 * Some supplicant implementations (e.g., Windows XP
1066 * WZC) update SNonce for each EAPOL-Key 2/4. This
1067 * breaks the workaround on accepting any of the
1068 * pending requests, so allow the SNonce to be updated
1069 * even if we have already sent out EAPOL-Key 3/4.
1070 */
1071 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1072 "Process SNonce update from STA "
1073 "based on retransmitted EAPOL-Key "
1074 "1/4");
1075 sm->update_snonce = 1;
1076 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1077 sm->alt_snonce_valid = TRUE;
1078 os_memcpy(sm->alt_replay_counter,
1079 sm->key_replay[0].counter,
1080 WPA_REPLAY_COUNTER_LEN);
1081 goto continue_processing;
1082 }
1083
1084 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1085 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1086 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1087 WPA_REPLAY_COUNTER_LEN) == 0) {
1088 /*
1089 * Supplicant may still be using the old SNonce since
1090 * there was two EAPOL-Key 2/4 messages and they had
1091 * different SNonce values.
1092 */
1093 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1094 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1095 goto continue_processing;
1096 }
1097
1098 if (msg == PAIRWISE_2 &&
1099 wpa_replay_counter_valid(sm->prev_key_replay,
1100 key->replay_counter) &&
1101 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1102 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1103 "ignore retransmitted EAPOL-Key %s - "
1104 "SNonce did not change", msgtxt);
1105 } else {
1106 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1107 "received EAPOL-Key %s with "
1108 "unexpected replay counter", msgtxt);
1109 }
1110 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1111 if (!sm->key_replay[i].valid)
1112 break;
1113 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1114 sm->key_replay[i].counter,
1115 WPA_REPLAY_COUNTER_LEN);
1116 }
1117 wpa_hexdump(MSG_DEBUG, "received replay counter",
1118 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1119 return;
1120 }
1121
1122 continue_processing:
1123 #ifdef CONFIG_FILS
1124 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1125 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1126 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1127 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1128 return;
1129 }
1130 #endif /* CONFIG_FILS */
1131
1132 switch (msg) {
1133 case PAIRWISE_2:
1134 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1135 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1136 (!sm->update_snonce ||
1137 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1138 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1139 "received EAPOL-Key msg 2/4 in "
1140 "invalid state (%d) - dropped",
1141 sm->wpa_ptk_state);
1142 return;
1143 }
1144 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1145 if (sm->group->reject_4way_hs_for_entropy) {
1146 /*
1147 * The system did not have enough entropy to generate
1148 * strong random numbers. Reject the first 4-way
1149 * handshake(s) and collect some entropy based on the
1150 * information from it. Once enough entropy is
1151 * available, the next atempt will trigger GMK/Key
1152 * Counter update and the station will be allowed to
1153 * continue.
1154 */
1155 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1156 "collect more entropy for random number "
1157 "generation");
1158 random_mark_pool_ready();
1159 wpa_sta_disconnect(wpa_auth, sm->addr);
1160 return;
1161 }
1162 break;
1163 case PAIRWISE_4:
1164 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1165 !sm->PTK_valid) {
1166 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1167 "received EAPOL-Key msg 4/4 in "
1168 "invalid state (%d) - dropped",
1169 sm->wpa_ptk_state);
1170 return;
1171 }
1172 break;
1173 case GROUP_2:
1174 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1175 || !sm->PTK_valid) {
1176 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1177 "received EAPOL-Key msg 2/2 in "
1178 "invalid state (%d) - dropped",
1179 sm->wpa_ptk_group_state);
1180 return;
1181 }
1182 break;
1183 #ifdef CONFIG_PEERKEY
1184 case SMK_M1:
1185 case SMK_M3:
1186 case SMK_ERROR:
1187 if (!wpa_auth->conf.peerkey) {
1188 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1189 "PeerKey use disabled - ignoring message");
1190 return;
1191 }
1192 if (!sm->PTK_valid) {
1193 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1194 "received EAPOL-Key msg SMK in "
1195 "invalid state - dropped");
1196 return;
1197 }
1198 break;
1199 #else /* CONFIG_PEERKEY */
1200 case SMK_M1:
1201 case SMK_M3:
1202 case SMK_ERROR:
1203 return; /* STSL disabled - ignore SMK messages */
1204 #endif /* CONFIG_PEERKEY */
1205 case REQUEST:
1206 break;
1207 }
1208
1209 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1210 "received EAPOL-Key frame (%s)", msgtxt);
1211
1212 if (key_info & WPA_KEY_INFO_ACK) {
1213 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1214 "received invalid EAPOL-Key: Key Ack set");
1215 return;
1216 }
1217
1218 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1219 !(key_info & WPA_KEY_INFO_MIC)) {
1220 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1221 "received invalid EAPOL-Key: Key MIC not set");
1222 return;
1223 }
1224
1225 #ifdef CONFIG_FILS
1226 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1227 (key_info & WPA_KEY_INFO_MIC)) {
1228 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1229 "received invalid EAPOL-Key: Key MIC set");
1230 return;
1231 }
1232 #endif /* CONFIG_FILS */
1233
1234 sm->MICVerified = FALSE;
1235 if (sm->PTK_valid && !sm->update_snonce) {
1236 if (mic_len &&
1237 wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
1238 data_len) &&
1239 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1240 wpa_try_alt_snonce(sm, data, data_len))) {
1241 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1242 "received EAPOL-Key with invalid MIC");
1243 return;
1244 }
1245 #ifdef CONFIG_FILS
1246 if (!mic_len &&
1247 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1248 &key_data_length) < 0) {
1249 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1250 "received EAPOL-Key with invalid MIC");
1251 return;
1252 }
1253 #endif /* CONFIG_FILS */
1254 sm->MICVerified = TRUE;
1255 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1256 sm->pending_1_of_4_timeout = 0;
1257 }
1258
1259 if (key_info & WPA_KEY_INFO_REQUEST) {
1260 if (sm->MICVerified) {
1261 sm->req_replay_counter_used = 1;
1262 os_memcpy(sm->req_replay_counter, key->replay_counter,
1263 WPA_REPLAY_COUNTER_LEN);
1264 } else {
1265 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1266 "received EAPOL-Key request with "
1267 "invalid MIC");
1268 return;
1269 }
1270
1271 /*
1272 * TODO: should decrypt key data field if encryption was used;
1273 * even though MAC address KDE is not normally encrypted,
1274 * supplicant is allowed to encrypt it.
1275 */
1276 if (msg == SMK_ERROR) {
1277 #ifdef CONFIG_PEERKEY
1278 wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
1279 #endif /* CONFIG_PEERKEY */
1280 return;
1281 } else if (key_info & WPA_KEY_INFO_ERROR) {
1282 if (wpa_receive_error_report(
1283 wpa_auth, sm,
1284 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1285 return; /* STA entry was removed */
1286 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1287 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1288 "received EAPOL-Key Request for new "
1289 "4-Way Handshake");
1290 wpa_request_new_ptk(sm);
1291 #ifdef CONFIG_PEERKEY
1292 } else if (msg == SMK_M1) {
1293 wpa_smk_m1(wpa_auth, sm, key, key_data,
1294 key_data_length);
1295 #endif /* CONFIG_PEERKEY */
1296 } else if (key_data_length > 0 &&
1297 wpa_parse_kde_ies(key_data, key_data_length,
1298 &kde) == 0 &&
1299 kde.mac_addr) {
1300 } else {
1301 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1302 "received EAPOL-Key Request for GTK "
1303 "rekeying");
1304 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1305 wpa_rekey_gtk(wpa_auth, NULL);
1306 }
1307 } else {
1308 /* Do not allow the same key replay counter to be reused. */
1309 wpa_replay_counter_mark_invalid(sm->key_replay,
1310 key->replay_counter);
1311
1312 if (msg == PAIRWISE_2) {
1313 /*
1314 * Maintain a copy of the pending EAPOL-Key frames in
1315 * case the EAPOL-Key frame was retransmitted. This is
1316 * needed to allow EAPOL-Key msg 2/4 reply to another
1317 * pending msg 1/4 to update the SNonce to work around
1318 * unexpected supplicant behavior.
1319 */
1320 os_memcpy(sm->prev_key_replay, sm->key_replay,
1321 sizeof(sm->key_replay));
1322 } else {
1323 os_memset(sm->prev_key_replay, 0,
1324 sizeof(sm->prev_key_replay));
1325 }
1326
1327 /*
1328 * Make sure old valid counters are not accepted anymore and
1329 * do not get copied again.
1330 */
1331 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1332 }
1333
1334 #ifdef CONFIG_PEERKEY
1335 if (msg == SMK_M3) {
1336 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
1337 return;
1338 }
1339 #endif /* CONFIG_PEERKEY */
1340
1341 os_free(sm->last_rx_eapol_key);
1342 sm->last_rx_eapol_key = os_malloc(data_len);
1343 if (sm->last_rx_eapol_key == NULL)
1344 return;
1345 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1346 sm->last_rx_eapol_key_len = data_len;
1347
1348 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1349 sm->EAPOLKeyReceived = TRUE;
1350 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1351 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1352 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1353 wpa_sm_step(sm);
1354 }
1355
1356
1357 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1358 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1359 {
1360 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1361 u8 *pos;
1362 int ret = 0;
1363
1364 /* GTK = PRF-X(GMK, "Group key expansion",
1365 * AA || GNonce || Time || random data)
1366 * The example described in the IEEE 802.11 standard uses only AA and
1367 * GNonce as inputs here. Add some more entropy since this derivation
1368 * is done only at the Authenticator and as such, does not need to be
1369 * exactly same.
1370 */
1371 os_memcpy(data, addr, ETH_ALEN);
1372 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1373 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1374 wpa_get_ntp_timestamp(pos);
1375 pos += 8;
1376 if (random_get_bytes(pos, 16) < 0)
1377 ret = -1;
1378
1379 #ifdef CONFIG_IEEE80211W
1380 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1381 #else /* CONFIG_IEEE80211W */
1382 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1383 < 0)
1384 ret = -1;
1385 #endif /* CONFIG_IEEE80211W */
1386
1387 return ret;
1388 }
1389
1390
1391 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1392 {
1393 struct wpa_authenticator *wpa_auth = eloop_ctx;
1394 struct wpa_state_machine *sm = timeout_ctx;
1395
1396 sm->pending_1_of_4_timeout = 0;
1397 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1398 sm->TimeoutEvt = TRUE;
1399 wpa_sm_step(sm);
1400 }
1401
1402
1403 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1404 struct wpa_state_machine *sm, int key_info,
1405 const u8 *key_rsc, const u8 *nonce,
1406 const u8 *kde, size_t kde_len,
1407 int keyidx, int encr, int force_version)
1408 {
1409 struct ieee802_1x_hdr *hdr;
1410 struct wpa_eapol_key *key;
1411 size_t len, mic_len, keyhdrlen;
1412 int alg;
1413 int key_data_len, pad_len = 0;
1414 u8 *buf, *pos;
1415 int version, pairwise;
1416 int i;
1417 u8 *key_mic, *key_data;
1418
1419 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
1420 keyhdrlen = sizeof(*key) + mic_len + 2;
1421
1422 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1423
1424 if (force_version)
1425 version = force_version;
1426 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1427 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1428 wpa_key_mgmt_fils(sm->wpa_key_mgmt))
1429 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1430 else if (wpa_use_aes_cmac(sm))
1431 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1432 else if (sm->pairwise != WPA_CIPHER_TKIP)
1433 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1434 else
1435 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1436
1437 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1438
1439 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1440 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1441 "encr=%d)",
1442 version,
1443 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1444 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1445 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1446 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1447 pairwise, (unsigned long) kde_len, keyidx, encr);
1448
1449 key_data_len = kde_len;
1450
1451 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1452 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1453 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1454 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1455 pad_len = key_data_len % 8;
1456 if (pad_len)
1457 pad_len = 8 - pad_len;
1458 key_data_len += pad_len + 8;
1459 }
1460
1461 len += key_data_len;
1462 if (!mic_len && encr)
1463 len += AES_BLOCK_SIZE;
1464
1465 hdr = os_zalloc(len);
1466 if (hdr == NULL)
1467 return;
1468 hdr->version = wpa_auth->conf.eapol_version;
1469 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1470 hdr->length = host_to_be16(len - sizeof(*hdr));
1471 key = (struct wpa_eapol_key *) (hdr + 1);
1472 key_mic = (u8 *) (key + 1);
1473 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1474
1475 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1476 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1477 key_info |= version;
1478 if (encr && sm->wpa == WPA_VERSION_WPA2)
1479 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1480 if (sm->wpa != WPA_VERSION_WPA2)
1481 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1482 WPA_PUT_BE16(key->key_info, key_info);
1483
1484 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1485 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1486 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1487 WPA_PUT_BE16(key->key_length, 0);
1488
1489 /* FIX: STSL: what to use as key_replay_counter? */
1490 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1491 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1492 os_memcpy(sm->key_replay[i].counter,
1493 sm->key_replay[i - 1].counter,
1494 WPA_REPLAY_COUNTER_LEN);
1495 }
1496 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1497 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1498 WPA_REPLAY_COUNTER_LEN);
1499 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1500 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1501 sm->key_replay[0].valid = TRUE;
1502
1503 if (nonce)
1504 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1505
1506 if (key_rsc)
1507 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1508
1509 if (kde && !encr) {
1510 os_memcpy(key_data, kde, kde_len);
1511 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1512 #ifdef CONFIG_FILS
1513 } else if (!mic_len) {
1514 const u8 *aad[1];
1515 size_t aad_len[1];
1516
1517 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1518 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1519 kde, kde_len);
1520
1521 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1522 sm->PTK.kek, sm->PTK.kek_len);
1523 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1524 * to Key Data (exclusive). */
1525 aad[0] = (u8 *) hdr;
1526 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1527 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1528 1, aad, aad_len, key_mic + 2) < 0) {
1529 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1530 return;
1531 }
1532
1533 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1534 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1535 #endif /* CONFIG_FILS */
1536 } else if (encr && kde) {
1537 buf = os_zalloc(key_data_len);
1538 if (buf == NULL) {
1539 os_free(hdr);
1540 return;
1541 }
1542 pos = buf;
1543 os_memcpy(pos, kde, kde_len);
1544 pos += kde_len;
1545
1546 if (pad_len)
1547 *pos++ = 0xdd;
1548
1549 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1550 buf, key_data_len);
1551 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1552 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1553 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1554 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1555 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1556 (key_data_len - 8) / 8, buf, key_data)) {
1557 os_free(hdr);
1558 os_free(buf);
1559 return;
1560 }
1561 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1562 #ifndef CONFIG_NO_RC4
1563 } else if (sm->PTK.kek_len == 16) {
1564 u8 ek[32];
1565 os_memcpy(key->key_iv,
1566 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1567 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1568 os_memcpy(ek, key->key_iv, 16);
1569 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1570 os_memcpy(key_data, buf, key_data_len);
1571 rc4_skip(ek, 32, 256, key_data, key_data_len);
1572 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1573 #endif /* CONFIG_NO_RC4 */
1574 } else {
1575 os_free(hdr);
1576 os_free(buf);
1577 return;
1578 }
1579 os_free(buf);
1580 }
1581
1582 if (key_info & WPA_KEY_INFO_MIC) {
1583 if (!sm->PTK_valid || !mic_len) {
1584 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1585 "PTK not valid when sending EAPOL-Key "
1586 "frame");
1587 os_free(hdr);
1588 return;
1589 }
1590
1591 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1592 sm->wpa_key_mgmt, version,
1593 (u8 *) hdr, len, key_mic);
1594 #ifdef CONFIG_TESTING_OPTIONS
1595 if (!pairwise &&
1596 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1597 drand48() <
1598 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1599 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1600 "Corrupting group EAPOL-Key Key MIC");
1601 key_mic[0]++;
1602 }
1603 #endif /* CONFIG_TESTING_OPTIONS */
1604 }
1605
1606 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1607 1);
1608 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1609 sm->pairwise_set);
1610 os_free(hdr);
1611 }
1612
1613
1614 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1615 struct wpa_state_machine *sm, int key_info,
1616 const u8 *key_rsc, const u8 *nonce,
1617 const u8 *kde, size_t kde_len,
1618 int keyidx, int encr)
1619 {
1620 int timeout_ms;
1621 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1622 int ctr;
1623
1624 if (sm == NULL)
1625 return;
1626
1627 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1628 keyidx, encr, 0);
1629
1630 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1631 if (ctr == 1 && wpa_auth->conf.tx_status)
1632 timeout_ms = pairwise ? eapol_key_timeout_first :
1633 eapol_key_timeout_first_group;
1634 else
1635 timeout_ms = eapol_key_timeout_subseq;
1636 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1637 sm->pending_1_of_4_timeout = 1;
1638 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1639 "counter %d)", timeout_ms, ctr);
1640 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1641 wpa_send_eapol_timeout, wpa_auth, sm);
1642 }
1643
1644
1645 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
1646 size_t data_len)
1647 {
1648 struct ieee802_1x_hdr *hdr;
1649 struct wpa_eapol_key *key;
1650 u16 key_info;
1651 int ret = 0;
1652 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1653 size_t mic_len = wpa_mic_len(akmp);
1654
1655 if (data_len < sizeof(*hdr) + sizeof(*key))
1656 return -1;
1657
1658 hdr = (struct ieee802_1x_hdr *) data;
1659 key = (struct wpa_eapol_key *) (hdr + 1);
1660 mic_pos = (u8 *) (key + 1);
1661 key_info = WPA_GET_BE16(key->key_info);
1662 os_memcpy(mic, mic_pos, mic_len);
1663 os_memset(mic_pos, 0, mic_len);
1664 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1665 key_info & WPA_KEY_INFO_TYPE_MASK,
1666 data, data_len, mic_pos) ||
1667 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1668 ret = -1;
1669 os_memcpy(mic_pos, mic, mic_len);
1670 return ret;
1671 }
1672
1673
1674 void wpa_remove_ptk(struct wpa_state_machine *sm)
1675 {
1676 sm->PTK_valid = FALSE;
1677 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1678 if (wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL,
1679 0))
1680 wpa_printf(MSG_DEBUG,
1681 "RSN: PTK removal from the driver failed");
1682 sm->pairwise_set = FALSE;
1683 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1684 }
1685
1686
1687 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1688 {
1689 int remove_ptk = 1;
1690
1691 if (sm == NULL)
1692 return -1;
1693
1694 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1695 "event %d notification", event);
1696
1697 switch (event) {
1698 case WPA_AUTH:
1699 #ifdef CONFIG_MESH
1700 /* PTKs are derived through AMPE */
1701 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1702 /* not mesh */
1703 break;
1704 }
1705 return 0;
1706 #endif /* CONFIG_MESH */
1707 case WPA_ASSOC:
1708 break;
1709 case WPA_DEAUTH:
1710 case WPA_DISASSOC:
1711 sm->DeauthenticationRequest = TRUE;
1712 break;
1713 case WPA_REAUTH:
1714 case WPA_REAUTH_EAPOL:
1715 if (!sm->started) {
1716 /*
1717 * When using WPS, we may end up here if the STA
1718 * manages to re-associate without the previous STA
1719 * entry getting removed. Consequently, we need to make
1720 * sure that the WPA state machines gets initialized
1721 * properly at this point.
1722 */
1723 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1724 "started - initialize now");
1725 sm->started = 1;
1726 sm->Init = TRUE;
1727 if (wpa_sm_step(sm) == 1)
1728 return 1; /* should not really happen */
1729 sm->Init = FALSE;
1730 sm->AuthenticationRequest = TRUE;
1731 break;
1732 }
1733 if (sm->GUpdateStationKeys) {
1734 /*
1735 * Reauthentication cancels the pending group key
1736 * update for this STA.
1737 */
1738 sm->group->GKeyDoneStations--;
1739 sm->GUpdateStationKeys = FALSE;
1740 sm->PtkGroupInit = TRUE;
1741 }
1742 sm->ReAuthenticationRequest = TRUE;
1743 break;
1744 case WPA_ASSOC_FT:
1745 #ifdef CONFIG_IEEE80211R_AP
1746 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1747 "after association");
1748 wpa_ft_install_ptk(sm);
1749
1750 /* Using FT protocol, not WPA auth state machine */
1751 sm->ft_completed = 1;
1752 return 0;
1753 #else /* CONFIG_IEEE80211R_AP */
1754 break;
1755 #endif /* CONFIG_IEEE80211R_AP */
1756 }
1757
1758 #ifdef CONFIG_IEEE80211R_AP
1759 sm->ft_completed = 0;
1760 #endif /* CONFIG_IEEE80211R_AP */
1761
1762 #ifdef CONFIG_IEEE80211W
1763 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1764 remove_ptk = 0;
1765 #endif /* CONFIG_IEEE80211W */
1766 #ifdef CONFIG_FILS
1767 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1768 (event == WPA_AUTH || event == WPA_ASSOC))
1769 remove_ptk = 0;
1770 #endif /* CONFIG_FILS */
1771
1772 if (remove_ptk) {
1773 sm->PTK_valid = FALSE;
1774 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1775
1776 if (event != WPA_REAUTH_EAPOL)
1777 wpa_remove_ptk(sm);
1778 }
1779
1780 if (sm->in_step_loop) {
1781 /*
1782 * wpa_sm_step() is already running - avoid recursive call to
1783 * it by making the existing loop process the new update.
1784 */
1785 sm->changed = TRUE;
1786 return 0;
1787 }
1788 return wpa_sm_step(sm);
1789 }
1790
1791
1792 SM_STATE(WPA_PTK, INITIALIZE)
1793 {
1794 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1795 if (sm->Init) {
1796 /* Init flag is not cleared here, so avoid busy
1797 * loop by claiming nothing changed. */
1798 sm->changed = FALSE;
1799 }
1800
1801 sm->keycount = 0;
1802 if (sm->GUpdateStationKeys)
1803 sm->group->GKeyDoneStations--;
1804 sm->GUpdateStationKeys = FALSE;
1805 if (sm->wpa == WPA_VERSION_WPA)
1806 sm->PInitAKeys = FALSE;
1807 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1808 * Local AA > Remote AA)) */) {
1809 sm->Pair = TRUE;
1810 }
1811 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1812 wpa_remove_ptk(sm);
1813 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1814 sm->TimeoutCtr = 0;
1815 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1816 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1817 WPA_EAPOL_authorized, 0);
1818 }
1819 }
1820
1821
1822 SM_STATE(WPA_PTK, DISCONNECT)
1823 {
1824 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1825 sm->Disconnect = FALSE;
1826 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1827 }
1828
1829
1830 SM_STATE(WPA_PTK, DISCONNECTED)
1831 {
1832 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1833 sm->DeauthenticationRequest = FALSE;
1834 }
1835
1836
1837 SM_STATE(WPA_PTK, AUTHENTICATION)
1838 {
1839 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1840 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1841 sm->PTK_valid = FALSE;
1842 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1843 1);
1844 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1845 sm->AuthenticationRequest = FALSE;
1846 }
1847
1848
1849 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1850 struct wpa_group *group)
1851 {
1852 if (group->first_sta_seen)
1853 return;
1854 /*
1855 * System has run bit further than at the time hostapd was started
1856 * potentially very early during boot up. This provides better chances
1857 * of collecting more randomness on embedded systems. Re-initialize the
1858 * GMK and Counter here to improve their strength if there was not
1859 * enough entropy available immediately after system startup.
1860 */
1861 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1862 "station");
1863 if (random_pool_ready() != 1) {
1864 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1865 "to proceed - reject first 4-way handshake");
1866 group->reject_4way_hs_for_entropy = TRUE;
1867 } else {
1868 group->first_sta_seen = TRUE;
1869 group->reject_4way_hs_for_entropy = FALSE;
1870 }
1871
1872 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1873 wpa_gtk_update(wpa_auth, group) < 0 ||
1874 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1875 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1876 group->first_sta_seen = FALSE;
1877 group->reject_4way_hs_for_entropy = TRUE;
1878 }
1879 }
1880
1881
1882 SM_STATE(WPA_PTK, AUTHENTICATION2)
1883 {
1884 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1885
1886 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1887 sm->ReAuthenticationRequest = FALSE;
1888
1889 /*
1890 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1891 * ambiguous. The Authenticator state machine uses a counter that is
1892 * incremented by one for each 4-way handshake. However, the security
1893 * analysis of 4-way handshake points out that unpredictable nonces
1894 * help in preventing precomputation attacks. Instead of the state
1895 * machine definition, use an unpredictable nonce value here to provide
1896 * stronger protection against potential precomputation attacks.
1897 */
1898 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1899 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1900 "ANonce.");
1901 sm->Disconnect = TRUE;
1902 return;
1903 }
1904 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1905 WPA_NONCE_LEN);
1906 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1907 * logical place than INITIALIZE since AUTHENTICATION2 can be
1908 * re-entered on ReAuthenticationRequest without going through
1909 * INITIALIZE. */
1910 sm->TimeoutCtr = 0;
1911 }
1912
1913
1914 SM_STATE(WPA_PTK, INITPMK)
1915 {
1916 u8 msk[2 * PMK_LEN];
1917 size_t len = 2 * PMK_LEN;
1918
1919 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1920 #ifdef CONFIG_IEEE80211R_AP
1921 sm->xxkey_len = 0;
1922 #endif /* CONFIG_IEEE80211R_AP */
1923 if (sm->pmksa) {
1924 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1925 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
1926 sm->pmk_len = sm->pmksa->pmk_len;
1927 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1928 unsigned int pmk_len;
1929
1930 if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
1931 pmk_len = PMK_LEN_SUITE_B_192;
1932 else
1933 pmk_len = PMK_LEN;
1934 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1935 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
1936 pmk_len);
1937 if (len < pmk_len) {
1938 wpa_printf(MSG_DEBUG,
1939 "WPA: MSK not long enough (%u) to create PMK (%u)",
1940 (unsigned int) len, (unsigned int) pmk_len);
1941 sm->Disconnect = TRUE;
1942 return;
1943 }
1944 os_memcpy(sm->PMK, msk, pmk_len);
1945 sm->pmk_len = pmk_len;
1946 #ifdef CONFIG_IEEE80211R_AP
1947 if (len >= 2 * PMK_LEN) {
1948 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1949 sm->xxkey_len = PMK_LEN;
1950 }
1951 #endif /* CONFIG_IEEE80211R_AP */
1952 } else {
1953 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
1954 sm->wpa_auth->cb->get_msk);
1955 sm->Disconnect = TRUE;
1956 return;
1957 }
1958 os_memset(msk, 0, sizeof(msk));
1959
1960 sm->req_replay_counter_used = 0;
1961 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1962 * will break reauthentication since EAPOL state machines may not be
1963 * get into AUTHENTICATING state that clears keyRun before WPA state
1964 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1965 * state and takes PMK from the previously used AAA Key. This will
1966 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1967 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1968 * be good workaround for this issue. */
1969 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1970 }
1971
1972
1973 SM_STATE(WPA_PTK, INITPSK)
1974 {
1975 const u8 *psk;
1976 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1977 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1978 if (psk) {
1979 os_memcpy(sm->PMK, psk, PMK_LEN);
1980 sm->pmk_len = PMK_LEN;
1981 #ifdef CONFIG_IEEE80211R_AP
1982 os_memcpy(sm->xxkey, psk, PMK_LEN);
1983 sm->xxkey_len = PMK_LEN;
1984 #endif /* CONFIG_IEEE80211R_AP */
1985 }
1986 sm->req_replay_counter_used = 0;
1987 }
1988
1989
1990 SM_STATE(WPA_PTK, PTKSTART)
1991 {
1992 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1993 size_t pmkid_len = 0;
1994
1995 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1996 sm->PTKRequest = FALSE;
1997 sm->TimeoutEvt = FALSE;
1998 sm->alt_snonce_valid = FALSE;
1999
2000 sm->TimeoutCtr++;
2001 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
2002 /* No point in sending the EAPOL-Key - we will disconnect
2003 * immediately following this. */
2004 return;
2005 }
2006
2007 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2008 "sending 1/4 msg of 4-Way Handshake");
2009 /*
2010 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
2011 * one possible PSK for this STA.
2012 */
2013 if (sm->wpa == WPA_VERSION_WPA2 &&
2014 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2015 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
2016 pmkid = buf;
2017 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
2018 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
2019 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
2020 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2021 if (sm->pmksa) {
2022 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2023 sm->pmksa->pmkid, PMKID_LEN);
2024 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2025 /* No KCK available to derive PMKID */
2026 pmkid = NULL;
2027 } else {
2028 /*
2029 * Calculate PMKID since no PMKSA cache entry was
2030 * available with pre-calculated PMKID.
2031 */
2032 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2033 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2034 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
2035 }
2036 }
2037 wpa_send_eapol(sm->wpa_auth, sm,
2038 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2039 sm->ANonce, pmkid, pmkid_len, 0, 0);
2040 }
2041
2042
2043 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2044 const u8 *pmk, unsigned int pmk_len,
2045 struct wpa_ptk *ptk)
2046 {
2047 #ifdef CONFIG_IEEE80211R_AP
2048 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2049 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2050 #endif /* CONFIG_IEEE80211R_AP */
2051
2052 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2053 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2054 ptk, sm->wpa_key_mgmt, sm->pairwise);
2055 }
2056
2057
2058 #ifdef CONFIG_FILS
2059
2060 int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
2061 size_t pmk_len, const u8 *snonce, const u8 *anonce)
2062 {
2063 u8 ick[FILS_ICK_MAX_LEN];
2064 size_t ick_len;
2065 int res;
2066
2067 res = fils_pmk_to_ptk(pmk, pmk_len, sm->addr, sm->wpa_auth->addr,
2068 snonce, anonce, &sm->PTK, ick, &ick_len,
2069 sm->wpa_key_mgmt, sm->pairwise);
2070 if (res < 0)
2071 return res;
2072 sm->PTK_valid = TRUE;
2073
2074 res = fils_key_auth_sk(ick, ick_len, snonce, anonce,
2075 sm->addr, sm->wpa_auth->addr,
2076 NULL, 0, NULL, 0, /* TODO: SK+PFS */
2077 sm->wpa_key_mgmt, sm->fils_key_auth_sta,
2078 sm->fils_key_auth_ap,
2079 &sm->fils_key_auth_len);
2080 os_memset(ick, 0, sizeof(ick));
2081
2082 /* Store nonces for (Re)Association Request/Response frame processing */
2083 os_memcpy(sm->SNonce, snonce, FILS_NONCE_LEN);
2084 os_memcpy(sm->ANonce, anonce, FILS_NONCE_LEN);
2085
2086 return res;
2087 }
2088
2089
2090 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2091 u8 *buf, size_t buf_len, u16 *_key_data_len)
2092 {
2093 struct ieee802_1x_hdr *hdr;
2094 struct wpa_eapol_key *key;
2095 u8 *pos;
2096 u16 key_data_len;
2097 u8 *tmp;
2098 const u8 *aad[1];
2099 size_t aad_len[1];
2100
2101 hdr = (struct ieee802_1x_hdr *) buf;
2102 key = (struct wpa_eapol_key *) (hdr + 1);
2103 pos = (u8 *) (key + 1);
2104 key_data_len = WPA_GET_BE16(pos);
2105 if (key_data_len < AES_BLOCK_SIZE ||
2106 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2107 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2108 "No room for AES-SIV data in the frame");
2109 return -1;
2110 }
2111 pos += 2; /* Pointing at the Encrypted Key Data field */
2112
2113 tmp = os_malloc(key_data_len);
2114 if (!tmp)
2115 return -1;
2116
2117 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2118 * to Key Data (exclusive). */
2119 aad[0] = buf;
2120 aad_len[0] = pos - buf;
2121 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2122 1, aad, aad_len, tmp) < 0) {
2123 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2124 "Invalid AES-SIV data in the frame");
2125 bin_clear_free(tmp, key_data_len);
2126 return -1;
2127 }
2128
2129 /* AEAD decryption and validation completed successfully */
2130 key_data_len -= AES_BLOCK_SIZE;
2131 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2132 tmp, key_data_len);
2133
2134 /* Replace Key Data field with the decrypted version */
2135 os_memcpy(pos, tmp, key_data_len);
2136 pos -= 2; /* Key Data Length field */
2137 WPA_PUT_BE16(pos, key_data_len);
2138 bin_clear_free(tmp, key_data_len);
2139 if (_key_data_len)
2140 *_key_data_len = key_data_len;
2141 return 0;
2142 }
2143
2144
2145 int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
2146 const struct ieee80211_mgmt *mgmt, size_t frame_len,
2147 u8 *pos, size_t left)
2148 {
2149 u16 fc, stype;
2150 const u8 *end, *ie_start, *ie, *session, *crypt;
2151 struct ieee802_11_elems elems;
2152 const u8 *aad[5];
2153 size_t aad_len[5];
2154
2155 if (!sm || !sm->PTK_valid) {
2156 wpa_printf(MSG_DEBUG,
2157 "FILS: No KEK to decrypt Assocication Request frame");
2158 return -1;
2159 }
2160
2161 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2162 wpa_printf(MSG_DEBUG,
2163 "FILS: Not a FILS AKM - reject association");
2164 return -1;
2165 }
2166
2167 end = ((const u8 *) mgmt) + frame_len;
2168 fc = le_to_host16(mgmt->frame_control);
2169 stype = WLAN_FC_GET_STYPE(fc);
2170 if (stype == WLAN_FC_STYPE_REASSOC_REQ)
2171 ie_start = mgmt->u.reassoc_req.variable;
2172 else
2173 ie_start = mgmt->u.assoc_req.variable;
2174 ie = ie_start;
2175
2176 /*
2177 * Find FILS Session element which is the last unencrypted element in
2178 * the frame.
2179 */
2180 session = NULL;
2181 while (ie + 1 < end) {
2182 if (ie + 2 + ie[1] > end)
2183 break;
2184 if (ie[0] == WLAN_EID_EXTENSION &&
2185 ie[1] >= 1 + FILS_SESSION_LEN &&
2186 ie[2] == WLAN_EID_EXT_FILS_SESSION) {
2187 session = ie;
2188 break;
2189 }
2190 ie += 2 + ie[1];
2191 }
2192
2193 if (!session) {
2194 wpa_printf(MSG_DEBUG,
2195 "FILS: Could not find FILS Session element in Association Request frame - reject");
2196 return -1;
2197 }
2198 if (os_memcmp(fils_session, session + 3, FILS_SESSION_LEN) != 0) {
2199 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
2200 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
2201 fils_session, FILS_SESSION_LEN);
2202 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
2203 session + 3, FILS_SESSION_LEN);
2204 return -1;
2205 }
2206 crypt = session + 2 + session[1];
2207
2208 if (end - crypt < AES_BLOCK_SIZE) {
2209 wpa_printf(MSG_DEBUG,
2210 "FILS: Too short frame to include AES-SIV data");
2211 return -1;
2212 }
2213
2214 /* AES-SIV AAD vectors */
2215
2216 /* The STA's MAC address */
2217 aad[0] = mgmt->sa;
2218 aad_len[0] = ETH_ALEN;
2219 /* The AP's BSSID */
2220 aad[1] = mgmt->da;
2221 aad_len[1] = ETH_ALEN;
2222 /* The STA's nonce */
2223 aad[2] = sm->SNonce;
2224 aad_len[2] = FILS_NONCE_LEN;
2225 /* The AP's nonce */
2226 aad[3] = sm->ANonce;
2227 aad_len[3] = FILS_NONCE_LEN;
2228 /*
2229 * The (Re)Association Request frame from the Capability Information
2230 * field to the FILS Session element (both inclusive).
2231 */
2232 aad[4] = (const u8 *) &mgmt->u.assoc_req.capab_info;
2233 aad_len[4] = crypt - aad[4];
2234
2235 if (aes_siv_decrypt(sm->PTK.kek, sm->PTK.kek_len, crypt, end - crypt,
2236 5, aad, aad_len, pos + (crypt - ie_start)) < 0) {
2237 wpa_printf(MSG_DEBUG,
2238 "FILS: Invalid AES-SIV data in the frame");
2239 return -1;
2240 }
2241 wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
2242 pos, left - AES_BLOCK_SIZE);
2243
2244 if (ieee802_11_parse_elems(pos, left - AES_BLOCK_SIZE, &elems, 1) ==
2245 ParseFailed) {
2246 wpa_printf(MSG_DEBUG,
2247 "FILS: Failed to parse decrypted elements");
2248 return -1;
2249 }
2250 if (!elems.fils_key_confirm) {
2251 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
2252 return -1;
2253 }
2254 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
2255 wpa_printf(MSG_DEBUG,
2256 "FILS: Unexpected Key-Auth length %d (expected %d)",
2257 elems.fils_key_confirm_len,
2258 (int) sm->fils_key_auth_len);
2259 return -1;
2260 }
2261 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
2262 sm->fils_key_auth_len) != 0) {
2263 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
2264 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
2265 elems.fils_key_confirm,
2266 elems.fils_key_confirm_len);
2267 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
2268 sm->fils_key_auth_sta, sm->fils_key_auth_len);
2269 return -1;
2270 }
2271
2272 return left - AES_BLOCK_SIZE;
2273 }
2274
2275
2276 int fils_encrypt_assoc(struct wpa_state_machine *sm, u8 *buf,
2277 size_t current_len, size_t max_len,
2278 const struct wpabuf *hlp)
2279 {
2280 u8 *end = buf + max_len;
2281 u8 *pos = buf + current_len;
2282 struct ieee80211_mgmt *mgmt;
2283 struct wpabuf *plain;
2284 u8 *len, *tmp, *tmp2;
2285 u8 hdr[2];
2286 u8 *gtk, dummy_gtk[32];
2287 size_t gtk_len;
2288 struct wpa_group *gsm;
2289 const u8 *aad[5];
2290 size_t aad_len[5];
2291
2292 if (!sm || !sm->PTK_valid)
2293 return -1;
2294
2295 wpa_hexdump(MSG_DEBUG,
2296 "FILS: Association Response frame before FILS processing",
2297 buf, current_len);
2298
2299 mgmt = (struct ieee80211_mgmt *) buf;
2300
2301 /* AES-SIV AAD vectors */
2302
2303 /* The AP's BSSID */
2304 aad[0] = mgmt->sa;
2305 aad_len[0] = ETH_ALEN;
2306 /* The STA's MAC address */
2307 aad[1] = mgmt->da;
2308 aad_len[1] = ETH_ALEN;
2309 /* The AP's nonce */
2310 aad[2] = sm->ANonce;
2311 aad_len[2] = FILS_NONCE_LEN;
2312 /* The STA's nonce */
2313 aad[3] = sm->SNonce;
2314 aad_len[3] = FILS_NONCE_LEN;
2315 /*
2316 * The (Re)Association Response frame from the Capability Information
2317 * field (the same offset in both Association and Reassociation
2318 * Response frames) to the FILS Session element (both inclusive).
2319 */
2320 aad[4] = (const u8 *) &mgmt->u.assoc_resp.capab_info;
2321 aad_len[4] = pos - aad[4];
2322
2323 /* The following elements will be encrypted with AES-SIV */
2324
2325 plain = wpabuf_alloc(1000);
2326 if (!plain)
2327 return -1;
2328
2329 /* TODO: FILS Public Key */
2330
2331 /* FILS Key Confirmation */
2332 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2333 wpabuf_put_u8(plain, 1 + sm->fils_key_auth_len); /* Length */
2334 /* Element ID Extension */
2335 wpabuf_put_u8(plain, WLAN_EID_EXT_FILS_KEY_CONFIRM);
2336 wpabuf_put_data(plain, sm->fils_key_auth_ap, sm->fils_key_auth_len);
2337
2338 /* FILS HLP Container */
2339 if (hlp)
2340 wpabuf_put_buf(plain, hlp);
2341
2342 /* TODO: FILS IP Address Assignment */
2343
2344 /* Key Delivery */
2345 gsm = sm->group;
2346 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2347 len = wpabuf_put(plain, 1);
2348 wpabuf_put_u8(plain, WLAN_EID_EXT_KEY_DELIVERY);
2349 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN,
2350 wpabuf_put(plain, WPA_KEY_RSC_LEN));
2351 /* GTK KDE */
2352 gtk = gsm->GTK[gsm->GN - 1];
2353 gtk_len = gsm->GTK_len;
2354 if (sm->wpa_auth->conf.disable_gtk) {
2355 /*
2356 * Provide unique random GTK to each STA to prevent use
2357 * of GTK in the BSS.
2358 */
2359 if (random_get_bytes(dummy_gtk, gtk_len) < 0) {
2360 wpabuf_free(plain);
2361 return -1;
2362 }
2363 gtk = dummy_gtk;
2364 }
2365 hdr[0] = gsm->GN & 0x03;
2366 hdr[1] = 0;
2367 tmp = wpabuf_put(plain, 0);
2368 tmp2 = wpa_add_kde(tmp, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2369 gtk, gtk_len);
2370 wpabuf_put(plain, tmp2 - tmp);
2371
2372 /* IGTK KDE */
2373 tmp = wpabuf_put(plain, 0);
2374 tmp2 = ieee80211w_kde_add(sm, tmp);
2375 wpabuf_put(plain, tmp2 - tmp);
2376
2377 *len = (u8 *) wpabuf_put(plain, 0) - len - 1;
2378
2379 if (pos + wpabuf_len(plain) + AES_BLOCK_SIZE > end) {
2380 wpa_printf(MSG_DEBUG,
2381 "FILS: Not enough room for FILS elements");
2382 wpabuf_free(plain);
2383 return -1;
2384 }
2385
2386 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: Association Response plaintext",
2387 plain);
2388
2389 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len,
2390 wpabuf_head(plain), wpabuf_len(plain),
2391 5, aad, aad_len, pos) < 0) {
2392 wpabuf_free(plain);
2393 return -1;
2394 }
2395
2396 wpa_hexdump(MSG_DEBUG,
2397 "FILS: Encrypted Association Response elements",
2398 pos, AES_BLOCK_SIZE + wpabuf_len(plain));
2399 current_len += wpabuf_len(plain) + AES_BLOCK_SIZE;
2400 wpabuf_free(plain);
2401
2402 sm->fils_completed = 1;
2403
2404 return current_len;
2405 }
2406
2407
2408 int fils_set_tk(struct wpa_state_machine *sm)
2409 {
2410 enum wpa_alg alg;
2411 int klen;
2412
2413 if (!sm || !sm->PTK_valid)
2414 return -1;
2415
2416 alg = wpa_cipher_to_alg(sm->pairwise);
2417 klen = wpa_cipher_key_len(sm->pairwise);
2418
2419 wpa_printf(MSG_DEBUG, "FILS: Configure TK to the driver");
2420 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2421 sm->PTK.tk, klen)) {
2422 wpa_printf(MSG_DEBUG, "FILS: Failed to set TK to the driver");
2423 return -1;
2424 }
2425
2426 return 0;
2427 }
2428
2429 #endif /* CONFIG_FILS */
2430
2431
2432 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2433 {
2434 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2435 struct wpa_ptk PTK;
2436 int ok = 0, psk_found = 0;
2437 const u8 *pmk = NULL;
2438 unsigned int pmk_len;
2439 int ft;
2440 const u8 *eapol_key_ie, *key_data, *mic;
2441 u16 key_data_length;
2442 size_t mic_len, eapol_key_ie_len;
2443 struct ieee802_1x_hdr *hdr;
2444 struct wpa_eapol_key *key;
2445 struct wpa_eapol_ie_parse kde;
2446
2447 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2448 sm->EAPOLKeyReceived = FALSE;
2449 sm->update_snonce = FALSE;
2450 os_memset(&PTK, 0, sizeof(PTK));
2451
2452 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
2453
2454 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2455 * WPA-PSK: iterate through possible PSKs and select the one matching
2456 * the packet */
2457 for (;;) {
2458 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2459 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2460 sm->p2p_dev_addr, pmk);
2461 if (pmk == NULL)
2462 break;
2463 psk_found = 1;
2464 pmk_len = PMK_LEN;
2465 } else {
2466 pmk = sm->PMK;
2467 pmk_len = sm->pmk_len;
2468 }
2469
2470 wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK);
2471
2472 if (mic_len &&
2473 wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
2474 sm->last_rx_eapol_key,
2475 sm->last_rx_eapol_key_len) == 0) {
2476 ok = 1;
2477 break;
2478 }
2479
2480 #ifdef CONFIG_FILS
2481 if (!mic_len &&
2482 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2483 sm->last_rx_eapol_key_len, NULL) == 0) {
2484 ok = 1;
2485 break;
2486 }
2487 #endif /* CONFIG_FILS */
2488
2489 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
2490 break;
2491 }
2492
2493 if (!ok) {
2494 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2495 "invalid MIC in msg 2/4 of 4-Way Handshake");
2496 if (psk_found)
2497 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2498 return;
2499 }
2500
2501 /*
2502 * Note: last_rx_eapol_key length fields have already been validated in
2503 * wpa_receive().
2504 */
2505 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2506 key = (struct wpa_eapol_key *) (hdr + 1);
2507 mic = (u8 *) (key + 1);
2508 key_data = mic + mic_len + 2;
2509 key_data_length = WPA_GET_BE16(mic + mic_len);
2510 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2511 sizeof(*key) - mic_len - 2)
2512 return;
2513
2514 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2515 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2516 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2517 return;
2518 }
2519 if (kde.rsn_ie) {
2520 eapol_key_ie = kde.rsn_ie;
2521 eapol_key_ie_len = kde.rsn_ie_len;
2522 } else if (kde.osen) {
2523 eapol_key_ie = kde.osen;
2524 eapol_key_ie_len = kde.osen_len;
2525 } else {
2526 eapol_key_ie = kde.wpa_ie;
2527 eapol_key_ie_len = kde.wpa_ie_len;
2528 }
2529 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2530 if (sm->wpa_ie == NULL ||
2531 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2532 eapol_key_ie, eapol_key_ie_len)) {
2533 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2534 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2535 if (sm->wpa_ie) {
2536 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2537 sm->wpa_ie, sm->wpa_ie_len);
2538 }
2539 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2540 eapol_key_ie, eapol_key_ie_len);
2541 /* MLME-DEAUTHENTICATE.request */
2542 wpa_sta_disconnect(wpa_auth, sm->addr);
2543 return;
2544 }
2545 #ifdef CONFIG_IEEE80211R_AP
2546 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2547 wpa_sta_disconnect(wpa_auth, sm->addr);
2548 return;
2549 }
2550 #endif /* CONFIG_IEEE80211R_AP */
2551 #ifdef CONFIG_P2P
2552 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2553 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2554 int idx;
2555 wpa_printf(MSG_DEBUG,
2556 "P2P: IP address requested in EAPOL-Key exchange");
2557 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2558 if (idx >= 0) {
2559 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2560 bitfield_set(wpa_auth->ip_pool, idx);
2561 WPA_PUT_BE32(sm->ip_addr, start + idx);
2562 wpa_printf(MSG_DEBUG,
2563 "P2P: Assigned IP address %u.%u.%u.%u to "
2564 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2565 sm->ip_addr[2], sm->ip_addr[3],
2566 MAC2STR(sm->addr));
2567 }
2568 }
2569 #endif /* CONFIG_P2P */
2570
2571 #ifdef CONFIG_IEEE80211R_AP
2572 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2573 /*
2574 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2575 * with the value we derived.
2576 */
2577 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2578 WPA_PMK_NAME_LEN) != 0) {
2579 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2580 "PMKR1Name mismatch in FT 4-way "
2581 "handshake");
2582 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2583 "Supplicant",
2584 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2585 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2586 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2587 return;
2588 }
2589 }
2590 #endif /* CONFIG_IEEE80211R_AP */
2591
2592 sm->pending_1_of_4_timeout = 0;
2593 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2594
2595 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2596 /* PSK may have changed from the previous choice, so update
2597 * state machine data based on whatever PSK was selected here.
2598 */
2599 os_memcpy(sm->PMK, pmk, PMK_LEN);
2600 sm->pmk_len = PMK_LEN;
2601 }
2602
2603 sm->MICVerified = TRUE;
2604
2605 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2606 sm->PTK_valid = TRUE;
2607 }
2608
2609
2610 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2611 {
2612 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2613 sm->TimeoutCtr = 0;
2614 }
2615
2616
2617 #ifdef CONFIG_IEEE80211W
2618
2619 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2620 {
2621 if (sm->mgmt_frame_prot) {
2622 size_t len;
2623 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2624 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2625 }
2626
2627 return 0;
2628 }
2629
2630
2631 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2632 {
2633 struct wpa_igtk_kde igtk;
2634 struct wpa_group *gsm = sm->group;
2635 u8 rsc[WPA_KEY_RSC_LEN];
2636 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2637
2638 if (!sm->mgmt_frame_prot)
2639 return pos;
2640
2641 igtk.keyid[0] = gsm->GN_igtk;
2642 igtk.keyid[1] = 0;
2643 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
2644 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
2645 os_memset(igtk.pn, 0, sizeof(igtk.pn));
2646 else
2647 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
2648 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
2649 if (sm->wpa_auth->conf.disable_gtk) {
2650 /*
2651 * Provide unique random IGTK to each STA to prevent use of
2652 * IGTK in the BSS.
2653 */
2654 if (random_get_bytes(igtk.igtk, len) < 0)
2655 return pos;
2656 }
2657 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
2658 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
2659 NULL, 0);
2660
2661 return pos;
2662 }
2663
2664 #else /* CONFIG_IEEE80211W */
2665
2666 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2667 {
2668 return 0;
2669 }
2670
2671
2672 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2673 {
2674 return pos;
2675 }
2676
2677 #endif /* CONFIG_IEEE80211W */
2678
2679
2680 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
2681 {
2682 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
2683 size_t gtk_len, kde_len;
2684 struct wpa_group *gsm = sm->group;
2685 u8 *wpa_ie;
2686 int wpa_ie_len, secure, keyidx, encr = 0;
2687
2688 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
2689 sm->TimeoutEvt = FALSE;
2690
2691 sm->TimeoutCtr++;
2692 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
2693 /* No point in sending the EAPOL-Key - we will disconnect
2694 * immediately following this. */
2695 return;
2696 }
2697
2698 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2699 GTK[GN], IGTK, [FTIE], [TIE * 2])
2700 */
2701 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2702 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2703 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2704 wpa_ie = sm->wpa_auth->wpa_ie;
2705 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2706 if (sm->wpa == WPA_VERSION_WPA &&
2707 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2708 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2709 /* WPA-only STA, remove RSN IE and possible MDIE */
2710 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2711 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
2712 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2713 wpa_ie_len = wpa_ie[1] + 2;
2714 }
2715 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2716 "sending 3/4 msg of 4-Way Handshake");
2717 if (sm->wpa == WPA_VERSION_WPA2) {
2718 /* WPA2 send GTK in the 4-way handshake */
2719 secure = 1;
2720 gtk = gsm->GTK[gsm->GN - 1];
2721 gtk_len = gsm->GTK_len;
2722 if (sm->wpa_auth->conf.disable_gtk) {
2723 /*
2724 * Provide unique random GTK to each STA to prevent use
2725 * of GTK in the BSS.
2726 */
2727 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2728 return;
2729 gtk = dummy_gtk;
2730 }
2731 keyidx = gsm->GN;
2732 _rsc = rsc;
2733 encr = 1;
2734 } else {
2735 /* WPA does not include GTK in msg 3/4 */
2736 secure = 0;
2737 gtk = NULL;
2738 gtk_len = 0;
2739 keyidx = 0;
2740 _rsc = NULL;
2741 if (sm->rx_eapol_key_secure) {
2742 /*
2743 * It looks like Windows 7 supplicant tries to use
2744 * Secure bit in msg 2/4 after having reported Michael
2745 * MIC failure and it then rejects the 4-way handshake
2746 * if msg 3/4 does not set Secure bit. Work around this
2747 * by setting the Secure bit here even in the case of
2748 * WPA if the supplicant used it first.
2749 */
2750 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2751 "STA used Secure bit in WPA msg 2/4 - "
2752 "set Secure for 3/4 as workaround");
2753 secure = 1;
2754 }
2755 }
2756
2757 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2758 if (gtk)
2759 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2760 #ifdef CONFIG_IEEE80211R_AP
2761 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2762 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2763 kde_len += 300; /* FTIE + 2 * TIE */
2764 }
2765 #endif /* CONFIG_IEEE80211R_AP */
2766 #ifdef CONFIG_P2P
2767 if (WPA_GET_BE32(sm->ip_addr) > 0)
2768 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2769 #endif /* CONFIG_P2P */
2770 kde = os_malloc(kde_len);
2771 if (kde == NULL)
2772 return;
2773
2774 pos = kde;
2775 os_memcpy(pos, wpa_ie, wpa_ie_len);
2776 pos += wpa_ie_len;
2777 #ifdef CONFIG_IEEE80211R_AP
2778 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2779 int res;
2780 size_t elen;
2781
2782 elen = pos - kde;
2783 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
2784 if (res < 0) {
2785 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2786 "PMKR1Name into RSN IE in EAPOL-Key data");
2787 os_free(kde);
2788 return;
2789 }
2790 pos -= wpa_ie_len;
2791 pos += elen;
2792 }
2793 #endif /* CONFIG_IEEE80211R_AP */
2794 if (gtk) {
2795 u8 hdr[2];
2796 hdr[0] = keyidx & 0x03;
2797 hdr[1] = 0;
2798 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2799 gtk, gtk_len);
2800 }
2801 pos = ieee80211w_kde_add(sm, pos);
2802
2803 #ifdef CONFIG_IEEE80211R_AP
2804 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2805 int res;
2806 struct wpa_auth_config *conf;
2807
2808 conf = &sm->wpa_auth->conf;
2809 if (sm->assoc_resp_ftie &&
2810 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
2811 os_memcpy(pos, sm->assoc_resp_ftie,
2812 2 + sm->assoc_resp_ftie[1]);
2813 res = 2 + sm->assoc_resp_ftie[1];
2814 } else {
2815 res = wpa_write_ftie(conf, conf->r0_key_holder,
2816 conf->r0_key_holder_len,
2817 NULL, NULL, pos,
2818 kde + kde_len - pos,
2819 NULL, 0);
2820 }
2821 if (res < 0) {
2822 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2823 "into EAPOL-Key Key Data");
2824 os_free(kde);
2825 return;
2826 }
2827 pos += res;
2828
2829 /* TIE[ReassociationDeadline] (TU) */
2830 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2831 *pos++ = 5;
2832 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2833 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2834 pos += 4;
2835
2836 /* TIE[KeyLifetime] (seconds) */
2837 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2838 *pos++ = 5;
2839 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2840 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2841 pos += 4;
2842 }
2843 #endif /* CONFIG_IEEE80211R_AP */
2844 #ifdef CONFIG_P2P
2845 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2846 u8 addr[3 * 4];
2847 os_memcpy(addr, sm->ip_addr, 4);
2848 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2849 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2850 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2851 addr, sizeof(addr), NULL, 0);
2852 }
2853 #endif /* CONFIG_P2P */
2854
2855 wpa_send_eapol(sm->wpa_auth, sm,
2856 (secure ? WPA_KEY_INFO_SECURE : 0) |
2857 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
2858 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2859 WPA_KEY_INFO_KEY_TYPE,
2860 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2861 os_free(kde);
2862 }
2863
2864
2865 SM_STATE(WPA_PTK, PTKINITDONE)
2866 {
2867 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2868 sm->EAPOLKeyReceived = FALSE;
2869 if (sm->Pair) {
2870 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2871 int klen = wpa_cipher_key_len(sm->pairwise);
2872 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2873 sm->PTK.tk, klen)) {
2874 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2875 return;
2876 }
2877 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2878 sm->pairwise_set = TRUE;
2879
2880 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2881 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2882 eloop_register_timeout(sm->wpa_auth->conf.
2883 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2884 sm->wpa_auth, sm);
2885 }
2886
2887 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2888 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2889 WPA_EAPOL_authorized, 1);
2890 }
2891 }
2892
2893 if (0 /* IBSS == TRUE */) {
2894 sm->keycount++;
2895 if (sm->keycount == 2) {
2896 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2897 WPA_EAPOL_portValid, 1);
2898 }
2899 } else {
2900 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2901 1);
2902 }
2903 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2904 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2905 if (sm->wpa == WPA_VERSION_WPA)
2906 sm->PInitAKeys = TRUE;
2907 else
2908 sm->has_GTK = TRUE;
2909 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2910 "pairwise key handshake completed (%s)",
2911 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2912
2913 #ifdef CONFIG_IEEE80211R_AP
2914 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2915 #endif /* CONFIG_IEEE80211R_AP */
2916 }
2917
2918
2919 SM_STEP(WPA_PTK)
2920 {
2921 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2922
2923 if (sm->Init)
2924 SM_ENTER(WPA_PTK, INITIALIZE);
2925 else if (sm->Disconnect
2926 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2927 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2928 "WPA_PTK: sm->Disconnect");
2929 SM_ENTER(WPA_PTK, DISCONNECT);
2930 }
2931 else if (sm->DeauthenticationRequest)
2932 SM_ENTER(WPA_PTK, DISCONNECTED);
2933 else if (sm->AuthenticationRequest)
2934 SM_ENTER(WPA_PTK, AUTHENTICATION);
2935 else if (sm->ReAuthenticationRequest)
2936 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2937 else if (sm->PTKRequest)
2938 SM_ENTER(WPA_PTK, PTKSTART);
2939 else switch (sm->wpa_ptk_state) {
2940 case WPA_PTK_INITIALIZE:
2941 break;
2942 case WPA_PTK_DISCONNECT:
2943 SM_ENTER(WPA_PTK, DISCONNECTED);
2944 break;
2945 case WPA_PTK_DISCONNECTED:
2946 SM_ENTER(WPA_PTK, INITIALIZE);
2947 break;
2948 case WPA_PTK_AUTHENTICATION:
2949 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2950 break;
2951 case WPA_PTK_AUTHENTICATION2:
2952 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2953 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2954 WPA_EAPOL_keyRun) > 0)
2955 SM_ENTER(WPA_PTK, INITPMK);
2956 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2957 /* FIX: && 802.1X::keyRun */)
2958 SM_ENTER(WPA_PTK, INITPSK);
2959 break;
2960 case WPA_PTK_INITPMK:
2961 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2962 WPA_EAPOL_keyAvailable) > 0)
2963 SM_ENTER(WPA_PTK, PTKSTART);
2964 else {
2965 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2966 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2967 "INITPMK - keyAvailable = false");
2968 SM_ENTER(WPA_PTK, DISCONNECT);
2969 }
2970 break;
2971 case WPA_PTK_INITPSK:
2972 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2973 NULL))
2974 SM_ENTER(WPA_PTK, PTKSTART);
2975 else {
2976 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2977 "no PSK configured for the STA");
2978 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2979 SM_ENTER(WPA_PTK, DISCONNECT);
2980 }
2981 break;
2982 case WPA_PTK_PTKSTART:
2983 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2984 sm->EAPOLKeyPairwise)
2985 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2986 else if (sm->TimeoutCtr >
2987 (int) dot11RSNAConfigPairwiseUpdateCount) {
2988 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2989 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2990 "PTKSTART: Retry limit %d reached",
2991 dot11RSNAConfigPairwiseUpdateCount);
2992 SM_ENTER(WPA_PTK, DISCONNECT);
2993 } else if (sm->TimeoutEvt)
2994 SM_ENTER(WPA_PTK, PTKSTART);
2995 break;
2996 case WPA_PTK_PTKCALCNEGOTIATING:
2997 if (sm->MICVerified)
2998 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2999 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3000 sm->EAPOLKeyPairwise)
3001 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3002 else if (sm->TimeoutEvt)
3003 SM_ENTER(WPA_PTK, PTKSTART);
3004 break;
3005 case WPA_PTK_PTKCALCNEGOTIATING2:
3006 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3007 break;
3008 case WPA_PTK_PTKINITNEGOTIATING:
3009 if (sm->update_snonce)
3010 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3011 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3012 sm->EAPOLKeyPairwise && sm->MICVerified)
3013 SM_ENTER(WPA_PTK, PTKINITDONE);
3014 else if (sm->TimeoutCtr >
3015 (int) dot11RSNAConfigPairwiseUpdateCount) {
3016 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3017 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3018 "PTKINITNEGOTIATING: Retry limit %d "
3019 "reached",
3020 dot11RSNAConfigPairwiseUpdateCount);
3021 SM_ENTER(WPA_PTK, DISCONNECT);
3022 } else if (sm->TimeoutEvt)
3023 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3024 break;
3025 case WPA_PTK_PTKINITDONE:
3026 break;
3027 }
3028 }
3029
3030
3031 SM_STATE(WPA_PTK_GROUP, IDLE)
3032 {
3033 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
3034 if (sm->Init) {
3035 /* Init flag is not cleared here, so avoid busy
3036 * loop by claiming nothing changed. */
3037 sm->changed = FALSE;
3038 }
3039 sm->GTimeoutCtr = 0;
3040 }
3041
3042
3043 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
3044 {
3045 u8 rsc[WPA_KEY_RSC_LEN];
3046 struct wpa_group *gsm = sm->group;
3047 const u8 *kde;
3048 u8 *kde_buf = NULL, *pos, hdr[2];
3049 size_t kde_len;
3050 u8 *gtk, dummy_gtk[32];
3051
3052 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
3053
3054 sm->GTimeoutCtr++;
3055 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
3056 /* No point in sending the EAPOL-Key - we will disconnect
3057 * immediately following this. */
3058 return;
3059 }
3060
3061 if (sm->wpa == WPA_VERSION_WPA)
3062 sm->PInitAKeys = FALSE;
3063 sm->TimeoutEvt = FALSE;
3064 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
3065 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3066 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
3067 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3068 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3069 "sending 1/2 msg of Group Key Handshake");
3070
3071 gtk = gsm->GTK[gsm->GN - 1];
3072 if (sm->wpa_auth->conf.disable_gtk) {
3073 /*
3074 * Provide unique random GTK to each STA to prevent use
3075 * of GTK in the BSS.
3076 */
3077 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
3078 return;
3079 gtk = dummy_gtk;
3080 }
3081 if (sm->wpa == WPA_VERSION_WPA2) {
3082 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
3083 ieee80211w_kde_len(sm);
3084 kde_buf = os_malloc(kde_len);
3085 if (kde_buf == NULL)
3086 return;
3087
3088 kde = pos = kde_buf;
3089 hdr[0] = gsm->GN & 0x03;
3090 hdr[1] = 0;
3091 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3092 gtk, gsm->GTK_len);
3093 pos = ieee80211w_kde_add(sm, pos);
3094 kde_len = pos - kde;
3095 } else {
3096 kde = gtk;
3097 kde_len = gsm->GTK_len;
3098 }
3099
3100 wpa_send_eapol(sm->wpa_auth, sm,
3101 WPA_KEY_INFO_SECURE |
3102 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
3103 WPA_KEY_INFO_ACK |
3104 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
3105 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1);
3106
3107 os_free(kde_buf);
3108 }
3109
3110
3111 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
3112 {
3113 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
3114 sm->EAPOLKeyReceived = FALSE;
3115 if (sm->GUpdateStationKeys)
3116 sm->group->GKeyDoneStations--;
3117 sm->GUpdateStationKeys = FALSE;
3118 sm->GTimeoutCtr = 0;
3119 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
3120 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3121 "group key handshake completed (%s)",
3122 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3123 sm->has_GTK = TRUE;
3124 }
3125
3126
3127 SM_STATE(WPA_PTK_GROUP, KEYERROR)
3128 {
3129 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
3130 if (sm->GUpdateStationKeys)
3131 sm->group->GKeyDoneStations--;
3132 sm->GUpdateStationKeys = FALSE;
3133 sm->Disconnect = TRUE;
3134 }
3135
3136
3137 SM_STEP(WPA_PTK_GROUP)
3138 {
3139 if (sm->Init || sm->PtkGroupInit) {
3140 SM_ENTER(WPA_PTK_GROUP, IDLE);
3141 sm->PtkGroupInit = FALSE;
3142 } else switch (sm->wpa_ptk_group_state) {
3143 case WPA_PTK_GROUP_IDLE:
3144 if (sm->GUpdateStationKeys ||
3145 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
3146 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3147 break;
3148 case WPA_PTK_GROUP_REKEYNEGOTIATING:
3149 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3150 !sm->EAPOLKeyPairwise && sm->MICVerified)
3151 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
3152 else if (sm->GTimeoutCtr >
3153 (int) dot11RSNAConfigGroupUpdateCount)
3154 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
3155 else if (sm->TimeoutEvt)
3156 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3157 break;
3158 case WPA_PTK_GROUP_KEYERROR:
3159 SM_ENTER(WPA_PTK_GROUP, IDLE);
3160 break;
3161 case WPA_PTK_GROUP_REKEYESTABLISHED:
3162 SM_ENTER(WPA_PTK_GROUP, IDLE);
3163 break;
3164 }
3165 }
3166
3167
3168 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
3169 struct wpa_group *group)
3170 {
3171 int ret = 0;
3172
3173 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3174 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3175 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
3176 wpa_auth->addr, group->GNonce,
3177 group->GTK[group->GN - 1], group->GTK_len) < 0)
3178 ret = -1;
3179 wpa_hexdump_key(MSG_DEBUG, "GTK",
3180 group->GTK[group->GN - 1], group->GTK_len);
3181
3182 #ifdef CONFIG_IEEE80211W
3183 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3184 size_t len;
3185 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3186 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3187 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3188 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
3189 wpa_auth->addr, group->GNonce,
3190 group->IGTK[group->GN_igtk - 4], len) < 0)
3191 ret = -1;
3192 wpa_hexdump_key(MSG_DEBUG, "IGTK",
3193 group->IGTK[group->GN_igtk - 4], len);
3194 }
3195 #endif /* CONFIG_IEEE80211W */
3196
3197 return ret;
3198 }
3199
3200
3201 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
3202 struct wpa_group *group)
3203 {
3204 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3205 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
3206 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
3207 group->wpa_group_state = WPA_GROUP_GTK_INIT;
3208
3209 /* GTK[0..N] = 0 */
3210 os_memset(group->GTK, 0, sizeof(group->GTK));
3211 group->GN = 1;
3212 group->GM = 2;
3213 #ifdef CONFIG_IEEE80211W
3214 group->GN_igtk = 4;
3215 group->GM_igtk = 5;
3216 #endif /* CONFIG_IEEE80211W */
3217 /* GTK[GN] = CalcGTK() */
3218 wpa_gtk_update(wpa_auth, group);
3219 }
3220
3221
3222 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
3223 {
3224 if (ctx != NULL && ctx != sm->group)
3225 return 0;
3226
3227 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
3228 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3229 "Not in PTKINITDONE; skip Group Key update");
3230 sm->GUpdateStationKeys = FALSE;
3231 return 0;
3232 }
3233 if (sm->GUpdateStationKeys) {
3234 /*
3235 * This should not really happen, so add a debug log entry.
3236 * Since we clear the GKeyDoneStations before the loop, the
3237 * station needs to be counted here anyway.
3238 */
3239 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3240 "GUpdateStationKeys was already set when "
3241 "marking station for GTK rekeying");
3242 }
3243
3244 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
3245 if (sm->is_wnmsleep)
3246 return 0;
3247
3248 sm->group->GKeyDoneStations++;
3249 sm->GUpdateStationKeys = TRUE;
3250
3251 wpa_sm_step(sm);
3252 return 0;
3253 }
3254
3255
3256 #ifdef CONFIG_WNM
3257 /* update GTK when exiting WNM-Sleep Mode */
3258 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
3259 {
3260 if (sm == NULL || sm->is_wnmsleep)
3261 return;
3262
3263 wpa_group_update_sta(sm, NULL);
3264 }
3265
3266
3267 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
3268 {
3269 if (sm)
3270 sm->is_wnmsleep = !!flag;
3271 }
3272
3273
3274 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3275 {
3276 struct wpa_group *gsm = sm->group;
3277 u8 *start = pos;
3278
3279 /*
3280 * GTK subelement:
3281 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
3282 * Key[5..32]
3283 */
3284 *pos++ = WNM_SLEEP_SUBELEM_GTK;
3285 *pos++ = 11 + gsm->GTK_len;
3286 /* Key ID in B0-B1 of Key Info */
3287 WPA_PUT_LE16(pos, gsm->GN & 0x03);
3288 pos += 2;
3289 *pos++ = gsm->GTK_len;
3290 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
3291 return 0;
3292 pos += 8;
3293 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3294 pos += gsm->GTK_len;
3295
3296 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
3297 gsm->GN);
3298 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
3299 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3300
3301 return pos - start;
3302 }
3303
3304
3305 #ifdef CONFIG_IEEE80211W
3306 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3307 {
3308 struct wpa_group *gsm = sm->group;
3309 u8 *start = pos;
3310 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3311
3312 /*
3313 * IGTK subelement:
3314 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
3315 */
3316 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
3317 *pos++ = 2 + 6 + len;
3318 WPA_PUT_LE16(pos, gsm->GN_igtk);
3319 pos += 2;
3320 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
3321 return 0;
3322 pos += 6;
3323
3324 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
3325 pos += len;
3326
3327 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
3328 gsm->GN_igtk);
3329 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
3330 gsm->IGTK[gsm->GN_igtk - 4], len);
3331
3332 return pos - start;
3333 }
3334 #endif /* CONFIG_IEEE80211W */
3335 #endif /* CONFIG_WNM */
3336
3337
3338 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3339 struct wpa_group *group)
3340 {
3341 int tmp;
3342
3343 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3344 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3345 group->changed = TRUE;
3346 group->wpa_group_state = WPA_GROUP_SETKEYS;
3347 group->GTKReKey = FALSE;
3348 tmp = group->GM;
3349 group->GM = group->GN;
3350 group->GN = tmp;
3351 #ifdef CONFIG_IEEE80211W
3352 tmp = group->GM_igtk;
3353 group->GM_igtk = group->GN_igtk;
3354 group->GN_igtk = tmp;
3355 #endif /* CONFIG_IEEE80211W */
3356 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3357 * counting the STAs that are marked with GUpdateStationKeys instead of
3358 * including all STAs that could be in not-yet-completed state. */
3359 wpa_gtk_update(wpa_auth, group);
3360
3361 if (group->GKeyDoneStations) {
3362 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3363 "GKeyDoneStations=%d when starting new GTK rekey",
3364 group->GKeyDoneStations);
3365 group->GKeyDoneStations = 0;
3366 }
3367 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3368 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3369 group->GKeyDoneStations);
3370 }
3371
3372
3373 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3374 struct wpa_group *group)
3375 {
3376 int ret = 0;
3377
3378 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3379 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3380 broadcast_ether_addr, group->GN,
3381 group->GTK[group->GN - 1], group->GTK_len) < 0)
3382 ret = -1;
3383
3384 #ifdef CONFIG_IEEE80211W
3385 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3386 enum wpa_alg alg;
3387 size_t len;
3388
3389 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3390 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3391
3392 if (ret == 0 &&
3393 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3394 broadcast_ether_addr, group->GN_igtk,
3395 group->IGTK[group->GN_igtk - 4], len) < 0)
3396 ret = -1;
3397 }
3398 #endif /* CONFIG_IEEE80211W */
3399
3400 return ret;
3401 }
3402
3403
3404 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3405 {
3406 if (sm->group == ctx) {
3407 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3408 " for discconnection due to fatal failure",
3409 MAC2STR(sm->addr));
3410 sm->Disconnect = TRUE;
3411 }
3412
3413 return 0;
3414 }
3415
3416
3417 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3418 struct wpa_group *group)
3419 {
3420 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3421 group->changed = TRUE;
3422 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3423 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3424 }
3425
3426
3427 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3428 struct wpa_group *group)
3429 {
3430 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3431 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3432 group->changed = TRUE;
3433 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
3434
3435 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
3436 wpa_group_fatal_failure(wpa_auth, group);
3437 return -1;
3438 }
3439
3440 return 0;
3441 }
3442
3443
3444 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
3445 struct wpa_group *group)
3446 {
3447 if (group->GInit) {
3448 wpa_group_gtk_init(wpa_auth, group);
3449 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
3450 /* Do not allow group operations */
3451 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
3452 group->GTKAuthenticator) {
3453 wpa_group_setkeysdone(wpa_auth, group);
3454 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
3455 group->GTKReKey) {
3456 wpa_group_setkeys(wpa_auth, group);
3457 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
3458 if (group->GKeyDoneStations == 0)
3459 wpa_group_setkeysdone(wpa_auth, group);
3460 else if (group->GTKReKey)
3461 wpa_group_setkeys(wpa_auth, group);
3462 }
3463 }
3464
3465
3466 static int wpa_sm_step(struct wpa_state_machine *sm)
3467 {
3468 if (sm == NULL)
3469 return 0;
3470
3471 if (sm->in_step_loop) {
3472 /* This should not happen, but if it does, make sure we do not
3473 * end up freeing the state machine too early by exiting the
3474 * recursive call. */
3475 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
3476 return 0;
3477 }
3478
3479 sm->in_step_loop = 1;
3480 do {
3481 if (sm->pending_deinit)
3482 break;
3483
3484 sm->changed = FALSE;
3485 sm->wpa_auth->group->changed = FALSE;
3486
3487 SM_STEP_RUN(WPA_PTK);
3488 if (sm->pending_deinit)
3489 break;
3490 SM_STEP_RUN(WPA_PTK_GROUP);
3491 if (sm->pending_deinit)
3492 break;
3493 wpa_group_sm_step(sm->wpa_auth, sm->group);
3494 } while (sm->changed || sm->wpa_auth->group->changed);
3495 sm->in_step_loop = 0;
3496
3497 if (sm->pending_deinit) {
3498 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
3499 "machine deinit for " MACSTR, MAC2STR(sm->addr));
3500 wpa_free_sta_sm(sm);
3501 return 1;
3502 }
3503 return 0;
3504 }
3505
3506
3507 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
3508 {
3509 struct wpa_state_machine *sm = eloop_ctx;
3510 wpa_sm_step(sm);
3511 }
3512
3513
3514 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
3515 {
3516 if (sm == NULL)
3517 return;
3518 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
3519 }
3520
3521
3522 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
3523 {
3524 int tmp, i;
3525 struct wpa_group *group;
3526
3527 if (wpa_auth == NULL)
3528 return;
3529
3530 group = wpa_auth->group;
3531
3532 for (i = 0; i < 2; i++) {
3533 tmp = group->GM;
3534 group->GM = group->GN;
3535 group->GN = tmp;
3536 #ifdef CONFIG_IEEE80211W
3537 tmp = group->GM_igtk;
3538 group->GM_igtk = group->GN_igtk;
3539 group->GN_igtk = tmp;
3540 #endif /* CONFIG_IEEE80211W */
3541 wpa_gtk_update(wpa_auth, group);
3542 wpa_group_config_group_keys(wpa_auth, group);
3543 }
3544 }
3545
3546
3547 static const char * wpa_bool_txt(int val)
3548 {
3549 return val ? "TRUE" : "FALSE";
3550 }
3551
3552
3553 #define RSN_SUITE "%02x-%02x-%02x-%d"
3554 #define RSN_SUITE_ARG(s) \
3555 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
3556
3557 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
3558 {
3559 int len = 0, ret;
3560 char pmkid_txt[PMKID_LEN * 2 + 1];
3561 #ifdef CONFIG_RSN_PREAUTH
3562 const int preauth = 1;
3563 #else /* CONFIG_RSN_PREAUTH */
3564 const int preauth = 0;
3565 #endif /* CONFIG_RSN_PREAUTH */
3566
3567 if (wpa_auth == NULL)
3568 return len;
3569
3570 ret = os_snprintf(buf + len, buflen - len,
3571 "dot11RSNAOptionImplemented=TRUE\n"
3572 "dot11RSNAPreauthenticationImplemented=%s\n"
3573 "dot11RSNAEnabled=%s\n"
3574 "dot11RSNAPreauthenticationEnabled=%s\n",
3575 wpa_bool_txt(preauth),
3576 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
3577 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
3578 if (os_snprintf_error(buflen - len, ret))
3579 return len;
3580 len += ret;
3581
3582 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
3583 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
3584
3585 ret = os_snprintf(
3586 buf + len, buflen - len,
3587 "dot11RSNAConfigVersion=%u\n"
3588 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
3589 /* FIX: dot11RSNAConfigGroupCipher */
3590 /* FIX: dot11RSNAConfigGroupRekeyMethod */
3591 /* FIX: dot11RSNAConfigGroupRekeyTime */
3592 /* FIX: dot11RSNAConfigGroupRekeyPackets */
3593 "dot11RSNAConfigGroupRekeyStrict=%u\n"
3594 "dot11RSNAConfigGroupUpdateCount=%u\n"
3595 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
3596 "dot11RSNAConfigGroupCipherSize=%u\n"
3597 "dot11RSNAConfigPMKLifetime=%u\n"
3598 "dot11RSNAConfigPMKReauthThreshold=%u\n"
3599 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
3600 "dot11RSNAConfigSATimeout=%u\n"
3601 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
3602 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
3603 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
3604 "dot11RSNAPMKIDUsed=%s\n"
3605 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
3606 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
3607 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
3608 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
3609 "dot11RSNA4WayHandshakeFailures=%u\n"
3610 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
3611 RSN_VERSION,
3612 !!wpa_auth->conf.wpa_strict_rekey,
3613 dot11RSNAConfigGroupUpdateCount,
3614 dot11RSNAConfigPairwiseUpdateCount,
3615 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
3616 dot11RSNAConfigPMKLifetime,
3617 dot11RSNAConfigPMKReauthThreshold,
3618 dot11RSNAConfigSATimeout,
3619 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
3620 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
3621 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
3622 pmkid_txt,
3623 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
3624 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
3625 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
3626 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
3627 wpa_auth->dot11RSNA4WayHandshakeFailures);
3628 if (os_snprintf_error(buflen - len, ret))
3629 return len;
3630 len += ret;
3631
3632 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
3633 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
3634
3635 /* Private MIB */
3636 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
3637 wpa_auth->group->wpa_group_state);
3638 if (os_snprintf_error(buflen - len, ret))
3639 return len;
3640 len += ret;
3641
3642 return len;
3643 }
3644
3645
3646 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
3647 {
3648 int len = 0, ret;
3649 u32 pairwise = 0;
3650
3651 if (sm == NULL)
3652 return 0;
3653
3654 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
3655
3656 /* dot11RSNAStatsEntry */
3657
3658 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
3659 WPA_PROTO_RSN : WPA_PROTO_WPA,
3660 sm->pairwise);
3661 if (pairwise == 0)
3662 return 0;
3663
3664 ret = os_snprintf(
3665 buf + len, buflen - len,
3666 /* TODO: dot11RSNAStatsIndex */
3667 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
3668 "dot11RSNAStatsVersion=1\n"
3669 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
3670 /* TODO: dot11RSNAStatsTKIPICVErrors */
3671 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
3672 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
3673 /* TODO: dot11RSNAStatsCCMPReplays */
3674 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
3675 /* TODO: dot11RSNAStatsTKIPReplays */,
3676 MAC2STR(sm->addr),
3677 RSN_SUITE_ARG(pairwise),
3678 sm->dot11RSNAStatsTKIPLocalMICFailures,
3679 sm->dot11RSNAStatsTKIPRemoteMICFailures);
3680 if (os_snprintf_error(buflen - len, ret))
3681 return len;
3682 len += ret;
3683
3684 /* Private MIB */
3685 ret = os_snprintf(buf + len, buflen - len,
3686 "hostapdWPAPTKState=%d\n"
3687 "hostapdWPAPTKGroupState=%d\n",
3688 sm->wpa_ptk_state,
3689 sm->wpa_ptk_group_state);
3690 if (os_snprintf_error(buflen - len, ret))
3691 return len;
3692 len += ret;
3693
3694 return len;
3695 }
3696
3697
3698 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
3699 {
3700 if (wpa_auth)
3701 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
3702 }
3703
3704
3705 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
3706 {
3707 return sm && sm->pairwise_set;
3708 }
3709
3710
3711 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
3712 {
3713 return sm->pairwise;
3714 }
3715
3716
3717 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3718 {
3719 if (sm == NULL)
3720 return -1;
3721 return sm->wpa_key_mgmt;
3722 }
3723
3724
3725 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3726 {
3727 if (sm == NULL)
3728 return 0;
3729 return sm->wpa;
3730 }
3731
3732
3733 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3734 struct rsn_pmksa_cache_entry *entry)
3735 {
3736 if (sm == NULL || sm->pmksa != entry)
3737 return -1;
3738 sm->pmksa = NULL;
3739 return 0;
3740 }
3741
3742
3743 struct rsn_pmksa_cache_entry *
3744 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3745 {
3746 return sm ? sm->pmksa : NULL;
3747 }
3748
3749
3750 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3751 {
3752 if (sm)
3753 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3754 }
3755
3756
3757 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3758 {
3759 if (wpa_auth == NULL)
3760 return NULL;
3761 *len = wpa_auth->wpa_ie_len;
3762 return wpa_auth->wpa_ie;
3763 }
3764
3765
3766 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3767 unsigned int pmk_len,
3768 int session_timeout, struct eapol_state_machine *eapol)
3769 {
3770 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3771 sm->wpa_auth->conf.disable_pmksa_caching)
3772 return -1;
3773
3774 if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
3775 if (pmk_len > PMK_LEN_SUITE_B_192)
3776 pmk_len = PMK_LEN_SUITE_B_192;
3777 } else if (pmk_len > PMK_LEN) {
3778 pmk_len = PMK_LEN;
3779 }
3780
3781 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
3782 sm->PTK.kck, sm->PTK.kck_len,
3783 sm->wpa_auth->addr, sm->addr, session_timeout,
3784 eapol, sm->wpa_key_mgmt))
3785 return 0;
3786
3787 return -1;
3788 }
3789
3790
3791 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3792 const u8 *pmk, size_t len, const u8 *sta_addr,
3793 int session_timeout,
3794 struct eapol_state_machine *eapol)
3795 {
3796 if (wpa_auth == NULL)
3797 return -1;
3798
3799 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
3800 NULL, 0,
3801 wpa_auth->addr,
3802 sta_addr, session_timeout, eapol,
3803 WPA_KEY_MGMT_IEEE8021X))
3804 return 0;
3805
3806 return -1;
3807 }
3808
3809
3810 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
3811 const u8 *pmk, const u8 *pmkid)
3812 {
3813 if (wpa_auth->conf.disable_pmksa_caching)
3814 return -1;
3815
3816 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
3817 NULL, 0,
3818 wpa_auth->addr, addr, 0, NULL,
3819 WPA_KEY_MGMT_SAE))
3820 return 0;
3821
3822 return -1;
3823 }
3824
3825
3826 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3827 const u8 *sta_addr)
3828 {
3829 struct rsn_pmksa_cache_entry *pmksa;
3830
3831 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3832 return;
3833 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3834 if (pmksa) {
3835 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3836 MACSTR " based on request", MAC2STR(sta_addr));
3837 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3838 }
3839 }
3840
3841
3842 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
3843 size_t len)
3844 {
3845 if (!wpa_auth || !wpa_auth->pmksa)
3846 return 0;
3847 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
3848 }
3849
3850
3851 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
3852 {
3853 if (wpa_auth && wpa_auth->pmksa)
3854 pmksa_cache_auth_flush(wpa_auth->pmksa);
3855 }
3856
3857
3858 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
3859 #ifdef CONFIG_MESH
3860
3861 int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
3862 char *buf, size_t len)
3863 {
3864 if (!wpa_auth || !wpa_auth->pmksa)
3865 return 0;
3866
3867 return pmksa_cache_auth_list_mesh(wpa_auth->pmksa, addr, buf, len);
3868 }
3869
3870
3871 struct rsn_pmksa_cache_entry *
3872 wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
3873 const u8 *pmkid, int expiration)
3874 {
3875 struct rsn_pmksa_cache_entry *entry;
3876 struct os_reltime now;
3877
3878 entry = pmksa_cache_auth_create_entry(pmk, PMK_LEN, pmkid, NULL, 0, aa,
3879 spa, 0, NULL, WPA_KEY_MGMT_SAE);
3880 if (!entry)
3881 return NULL;
3882
3883 os_get_reltime(&now);
3884 entry->expiration = now.sec + expiration;
3885 return entry;
3886 }
3887
3888
3889 int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
3890 struct rsn_pmksa_cache_entry *entry)
3891 {
3892 int ret;
3893
3894 if (!wpa_auth || !wpa_auth->pmksa)
3895 return -1;
3896
3897 ret = pmksa_cache_auth_add_entry(wpa_auth->pmksa, entry);
3898 if (ret < 0)
3899 wpa_printf(MSG_DEBUG,
3900 "RSN: Failed to store external PMKSA cache for "
3901 MACSTR, MAC2STR(entry->spa));
3902
3903 return ret;
3904 }
3905
3906 #endif /* CONFIG_MESH */
3907 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
3908
3909
3910 struct rsn_pmksa_cache_entry *
3911 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
3912 const u8 *pmkid)
3913 {
3914 if (!wpa_auth || !wpa_auth->pmksa)
3915 return NULL;
3916 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, pmkid);
3917 }
3918
3919
3920 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
3921 struct wpa_state_machine *sm,
3922 struct wpa_authenticator *wpa_auth,
3923 u8 *pmkid, u8 *pmk)
3924 {
3925 if (!sm)
3926 return;
3927
3928 sm->pmksa = pmksa;
3929 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
3930 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
3931 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
3932 }
3933
3934
3935 /*
3936 * Remove and free the group from wpa_authenticator. This is triggered by a
3937 * callback to make sure nobody is currently iterating the group list while it
3938 * gets modified.
3939 */
3940 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
3941 struct wpa_group *group)
3942 {
3943 struct wpa_group *prev = wpa_auth->group;
3944
3945 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
3946 group->vlan_id);
3947
3948 while (prev) {
3949 if (prev->next == group) {
3950 /* This never frees the special first group as needed */
3951 prev->next = group->next;
3952 os_free(group);
3953 break;
3954 }
3955 prev = prev->next;
3956 }
3957
3958 }
3959
3960
3961 /* Increase the reference counter for group */
3962 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
3963 struct wpa_group *group)
3964 {
3965 /* Skip the special first group */
3966 if (wpa_auth->group == group)
3967 return;
3968
3969 group->references++;
3970 }
3971
3972
3973 /* Decrease the reference counter and maybe free the group */
3974 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
3975 struct wpa_group *group)
3976 {
3977 /* Skip the special first group */
3978 if (wpa_auth->group == group)
3979 return;
3980
3981 group->references--;
3982 if (group->references)
3983 return;
3984 wpa_group_free(wpa_auth, group);
3985 }
3986
3987
3988 /*
3989 * Add a group that has its references counter set to zero. Caller needs to
3990 * call wpa_group_get() on the return value to mark the entry in use.
3991 */
3992 static struct wpa_group *
3993 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3994 {
3995 struct wpa_group *group;
3996
3997 if (wpa_auth == NULL || wpa_auth->group == NULL)
3998 return NULL;
3999
4000 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
4001 vlan_id);
4002 group = wpa_group_init(wpa_auth, vlan_id, 0);
4003 if (group == NULL)
4004 return NULL;
4005
4006 group->next = wpa_auth->group->next;
4007 wpa_auth->group->next = group;
4008
4009 return group;
4010 }
4011
4012
4013 /*
4014 * Enforce that the group state machine for the VLAN is running, increase
4015 * reference counter as interface is up. References might have been increased
4016 * even if a negative value is returned.
4017 * Returns: -1 on error (group missing, group already failed); otherwise, 0
4018 */
4019 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4020 {
4021 struct wpa_group *group;
4022
4023 if (wpa_auth == NULL)
4024 return 0;
4025
4026 group = wpa_auth->group;
4027 while (group) {
4028 if (group->vlan_id == vlan_id)
4029 break;
4030 group = group->next;
4031 }
4032
4033 if (group == NULL) {
4034 group = wpa_auth_add_group(wpa_auth, vlan_id);
4035 if (group == NULL)
4036 return -1;
4037 }
4038
4039 wpa_printf(MSG_DEBUG,
4040 "WPA: Ensure group state machine running for VLAN ID %d",
4041 vlan_id);
4042
4043 wpa_group_get(wpa_auth, group);
4044 group->num_setup_iface++;
4045
4046 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4047 return -1;
4048
4049 return 0;
4050 }
4051
4052
4053 /*
4054 * Decrease reference counter, expected to be zero afterwards.
4055 * returns: -1 on error (group not found, group in fail state)
4056 * -2 if wpa_group is still referenced
4057 * 0 else
4058 */
4059 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4060 {
4061 struct wpa_group *group;
4062 int ret = 0;
4063
4064 if (wpa_auth == NULL)
4065 return 0;
4066
4067 group = wpa_auth->group;
4068 while (group) {
4069 if (group->vlan_id == vlan_id)
4070 break;
4071 group = group->next;
4072 }
4073
4074 if (group == NULL)
4075 return -1;
4076
4077 wpa_printf(MSG_DEBUG,
4078 "WPA: Try stopping group state machine for VLAN ID %d",
4079 vlan_id);
4080
4081 if (group->num_setup_iface <= 0) {
4082 wpa_printf(MSG_ERROR,
4083 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
4084 vlan_id);
4085 return -1;
4086 }
4087 group->num_setup_iface--;
4088
4089 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4090 ret = -1;
4091
4092 if (group->references > 1) {
4093 wpa_printf(MSG_DEBUG,
4094 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
4095 vlan_id);
4096 ret = -2;
4097 }
4098
4099 wpa_group_put(wpa_auth, group);
4100
4101 return ret;
4102 }
4103
4104
4105 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
4106 {
4107 struct wpa_group *group;
4108
4109 if (sm == NULL || sm->wpa_auth == NULL)
4110 return 0;
4111
4112 group = sm->wpa_auth->group;
4113 while (group) {
4114 if (group->vlan_id == vlan_id)
4115 break;
4116 group = group->next;
4117 }
4118
4119 if (group == NULL) {
4120 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
4121 if (group == NULL)
4122 return -1;
4123 }
4124
4125 if (sm->group == group)
4126 return 0;
4127
4128 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4129 return -1;
4130
4131 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
4132 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
4133
4134 wpa_group_get(sm->wpa_auth, group);
4135 wpa_group_put(sm->wpa_auth, sm->group);
4136 sm->group = group;
4137
4138 return 0;
4139 }
4140
4141
4142 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
4143 struct wpa_state_machine *sm, int ack)
4144 {
4145 if (wpa_auth == NULL || sm == NULL)
4146 return;
4147 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
4148 " ack=%d", MAC2STR(sm->addr), ack);
4149 if (sm->pending_1_of_4_timeout && ack) {
4150 /*
4151 * Some deployed supplicant implementations update their SNonce
4152 * for each EAPOL-Key 2/4 message even within the same 4-way
4153 * handshake and then fail to use the first SNonce when
4154 * deriving the PTK. This results in unsuccessful 4-way
4155 * handshake whenever the relatively short initial timeout is
4156 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
4157 * around this by increasing the timeout now that we know that
4158 * the station has received the frame.
4159 */
4160 int timeout_ms = eapol_key_timeout_subseq;
4161 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
4162 "timeout by %u ms because of acknowledged frame",
4163 timeout_ms);
4164 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
4165 eloop_register_timeout(timeout_ms / 1000,
4166 (timeout_ms % 1000) * 1000,
4167 wpa_send_eapol_timeout, wpa_auth, sm);
4168 }
4169 }
4170
4171
4172 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
4173 {
4174 if (sm == NULL)
4175 return 0;
4176 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
4177 }
4178
4179
4180 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
4181 {
4182 if (sm == NULL)
4183 return 0;
4184 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
4185 }
4186
4187
4188 #ifdef CONFIG_P2P
4189 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
4190 {
4191 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
4192 return -1;
4193 os_memcpy(addr, sm->ip_addr, 4);
4194 return 0;
4195 }
4196 #endif /* CONFIG_P2P */
4197
4198
4199 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
4200 struct radius_das_attrs *attr)
4201 {
4202 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
4203 }
4204
4205
4206 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
4207 {
4208 struct wpa_group *group;
4209
4210 if (!wpa_auth)
4211 return;
4212 for (group = wpa_auth->group; group; group = group->next)
4213 wpa_group_config_group_keys(wpa_auth, group);
4214 }
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