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Note set_key(WPA_ALG_NONE) failure in debug log
[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
243 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
244 ret = 1;
245 #endif /* CONFIG_IEEE80211R */
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 struct wpa_auth_callbacks *cb)
420 {
421 struct wpa_authenticator *wpa_auth;
422
423 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
424 if (wpa_auth == NULL)
425 return NULL;
426 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
427 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
428 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
429
430 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
431 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
432 os_free(wpa_auth);
433 return NULL;
434 }
435
436 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
437 if (wpa_auth->group == NULL) {
438 os_free(wpa_auth->wpa_ie);
439 os_free(wpa_auth);
440 return NULL;
441 }
442
443 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
444 wpa_auth);
445 if (wpa_auth->pmksa == NULL) {
446 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
447 os_free(wpa_auth->group);
448 os_free(wpa_auth->wpa_ie);
449 os_free(wpa_auth);
450 return NULL;
451 }
452
453 #ifdef CONFIG_IEEE80211R
454 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
455 if (wpa_auth->ft_pmk_cache == NULL) {
456 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
457 os_free(wpa_auth->group);
458 os_free(wpa_auth->wpa_ie);
459 pmksa_cache_auth_deinit(wpa_auth->pmksa);
460 os_free(wpa_auth);
461 return NULL;
462 }
463 #endif /* CONFIG_IEEE80211R */
464
465 if (wpa_auth->conf.wpa_gmk_rekey) {
466 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
467 wpa_rekey_gmk, wpa_auth, NULL);
468 }
469
470 if (wpa_auth->conf.wpa_group_rekey) {
471 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
472 wpa_rekey_gtk, wpa_auth, NULL);
473 }
474
475 #ifdef CONFIG_P2P
476 if (WPA_GET_BE32(conf->ip_addr_start)) {
477 int count = WPA_GET_BE32(conf->ip_addr_end) -
478 WPA_GET_BE32(conf->ip_addr_start) + 1;
479 if (count > 1000)
480 count = 1000;
481 if (count > 0)
482 wpa_auth->ip_pool = bitfield_alloc(count);
483 }
484 #endif /* CONFIG_P2P */
485
486 return wpa_auth;
487 }
488
489
490 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
491 {
492 struct wpa_group *group = wpa_auth->group;
493
494 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
495 "keys");
496 wpa_group_sm_step(wpa_auth, group);
497 group->GInit = FALSE;
498 wpa_group_sm_step(wpa_auth, group);
499 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
500 return -1;
501 return 0;
502 }
503
504
505 /**
506 * wpa_deinit - Deinitialize WPA authenticator
507 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
508 */
509 void wpa_deinit(struct wpa_authenticator *wpa_auth)
510 {
511 struct wpa_group *group, *prev;
512
513 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
514 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
515
516 #ifdef CONFIG_PEERKEY
517 while (wpa_auth->stsl_negotiations)
518 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
519 #endif /* CONFIG_PEERKEY */
520
521 pmksa_cache_auth_deinit(wpa_auth->pmksa);
522
523 #ifdef CONFIG_IEEE80211R
524 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
525 wpa_auth->ft_pmk_cache = NULL;
526 #endif /* CONFIG_IEEE80211R */
527
528 #ifdef CONFIG_P2P
529 bitfield_free(wpa_auth->ip_pool);
530 #endif /* CONFIG_P2P */
531
532
533 os_free(wpa_auth->wpa_ie);
534
535 group = wpa_auth->group;
536 while (group) {
537 prev = group;
538 group = group->next;
539 os_free(prev);
540 }
541
542 os_free(wpa_auth);
543 }
544
545
546 /**
547 * wpa_reconfig - Update WPA authenticator configuration
548 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
549 * @conf: Configuration for WPA authenticator
550 */
551 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
552 struct wpa_auth_config *conf)
553 {
554 struct wpa_group *group;
555 if (wpa_auth == NULL)
556 return 0;
557
558 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
559 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
560 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
561 return -1;
562 }
563
564 /*
565 * Reinitialize GTK to make sure it is suitable for the new
566 * configuration.
567 */
568 group = wpa_auth->group;
569 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
570 group->GInit = TRUE;
571 wpa_group_sm_step(wpa_auth, group);
572 group->GInit = FALSE;
573 wpa_group_sm_step(wpa_auth, group);
574
575 return 0;
576 }
577
578
579 struct wpa_state_machine *
580 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
581 const u8 *p2p_dev_addr)
582 {
583 struct wpa_state_machine *sm;
584
585 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
586 return NULL;
587
588 sm = os_zalloc(sizeof(struct wpa_state_machine));
589 if (sm == NULL)
590 return NULL;
591 os_memcpy(sm->addr, addr, ETH_ALEN);
592 if (p2p_dev_addr)
593 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
594
595 sm->wpa_auth = wpa_auth;
596 sm->group = wpa_auth->group;
597 wpa_group_get(sm->wpa_auth, sm->group);
598
599 return sm;
600 }
601
602
603 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
604 struct wpa_state_machine *sm)
605 {
606 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
607 return -1;
608
609 #ifdef CONFIG_IEEE80211R
610 if (sm->ft_completed) {
611 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
612 "FT authentication already completed - do not "
613 "start 4-way handshake");
614 /* Go to PTKINITDONE state to allow GTK rekeying */
615 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
616 return 0;
617 }
618 #endif /* CONFIG_IEEE80211R */
619
620 #ifdef CONFIG_FILS
621 if (sm->fils_completed) {
622 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
623 "FILS authentication already completed - do not start 4-way handshake");
624 /* Go to PTKINITDONE state to allow GTK rekeying */
625 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
626 return 0;
627 }
628 #endif /* CONFIG_FILS */
629
630 if (sm->started) {
631 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
632 sm->ReAuthenticationRequest = TRUE;
633 return wpa_sm_step(sm);
634 }
635
636 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
637 "start authentication");
638 sm->started = 1;
639
640 sm->Init = TRUE;
641 if (wpa_sm_step(sm) == 1)
642 return 1; /* should not really happen */
643 sm->Init = FALSE;
644 sm->AuthenticationRequest = TRUE;
645 return wpa_sm_step(sm);
646 }
647
648
649 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
650 {
651 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
652 * reassociates back to the same AP while the previous entry for the
653 * STA has not yet been removed. */
654 if (sm == NULL)
655 return;
656
657 sm->wpa_key_mgmt = 0;
658 }
659
660
661 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
662 {
663 #ifdef CONFIG_P2P
664 if (WPA_GET_BE32(sm->ip_addr)) {
665 u32 start;
666 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
667 "address %u.%u.%u.%u from " MACSTR,
668 sm->ip_addr[0], sm->ip_addr[1],
669 sm->ip_addr[2], sm->ip_addr[3],
670 MAC2STR(sm->addr));
671 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
672 bitfield_clear(sm->wpa_auth->ip_pool,
673 WPA_GET_BE32(sm->ip_addr) - start);
674 }
675 #endif /* CONFIG_P2P */
676 if (sm->GUpdateStationKeys) {
677 sm->group->GKeyDoneStations--;
678 sm->GUpdateStationKeys = FALSE;
679 }
680 #ifdef CONFIG_IEEE80211R
681 os_free(sm->assoc_resp_ftie);
682 wpabuf_free(sm->ft_pending_req_ies);
683 #endif /* CONFIG_IEEE80211R */
684 os_free(sm->last_rx_eapol_key);
685 os_free(sm->wpa_ie);
686 wpa_group_put(sm->wpa_auth, sm->group);
687 os_free(sm);
688 }
689
690
691 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
692 {
693 if (sm == NULL)
694 return;
695
696 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
697 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
698 "strict rekeying - force GTK rekey since STA "
699 "is leaving");
700 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
701 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
702 NULL);
703 }
704
705 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
706 sm->pending_1_of_4_timeout = 0;
707 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
708 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
709 if (sm->in_step_loop) {
710 /* Must not free state machine while wpa_sm_step() is running.
711 * Freeing will be completed in the end of wpa_sm_step(). */
712 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
713 "machine deinit for " MACSTR, MAC2STR(sm->addr));
714 sm->pending_deinit = 1;
715 } else
716 wpa_free_sta_sm(sm);
717 }
718
719
720 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
721 {
722 if (sm == NULL)
723 return;
724
725 sm->PTKRequest = TRUE;
726 sm->PTK_valid = 0;
727 }
728
729
730 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
731 const u8 *replay_counter)
732 {
733 int i;
734 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
735 if (!ctr[i].valid)
736 break;
737 if (os_memcmp(replay_counter, ctr[i].counter,
738 WPA_REPLAY_COUNTER_LEN) == 0)
739 return 1;
740 }
741 return 0;
742 }
743
744
745 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
746 const u8 *replay_counter)
747 {
748 int i;
749 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
750 if (ctr[i].valid &&
751 (replay_counter == NULL ||
752 os_memcmp(replay_counter, ctr[i].counter,
753 WPA_REPLAY_COUNTER_LEN) == 0))
754 ctr[i].valid = FALSE;
755 }
756 }
757
758
759 #ifdef CONFIG_IEEE80211R
760 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
761 struct wpa_state_machine *sm,
762 struct wpa_eapol_ie_parse *kde)
763 {
764 struct wpa_ie_data ie;
765 struct rsn_mdie *mdie;
766
767 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
768 ie.num_pmkid != 1 || ie.pmkid == NULL) {
769 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
770 "FT 4-way handshake message 2/4");
771 return -1;
772 }
773
774 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
775 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
776 sm->sup_pmk_r1_name, PMKID_LEN);
777
778 if (!kde->mdie || !kde->ftie) {
779 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
780 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
781 return -1;
782 }
783
784 mdie = (struct rsn_mdie *) (kde->mdie + 2);
785 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
786 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
787 MOBILITY_DOMAIN_ID_LEN) != 0) {
788 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
789 return -1;
790 }
791
792 if (sm->assoc_resp_ftie &&
793 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
794 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
795 2 + sm->assoc_resp_ftie[1]) != 0)) {
796 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
797 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
798 kde->ftie, kde->ftie_len);
799 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
800 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
801 return -1;
802 }
803
804 return 0;
805 }
806 #endif /* CONFIG_IEEE80211R */
807
808
809 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
810 struct wpa_state_machine *sm, int group)
811 {
812 /* Supplicant reported a Michael MIC error */
813 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
814 "received EAPOL-Key Error Request "
815 "(STA detected Michael MIC failure (group=%d))",
816 group);
817
818 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
819 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
820 "ignore Michael MIC failure report since "
821 "group cipher is not TKIP");
822 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
823 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
824 "ignore Michael MIC failure report since "
825 "pairwise cipher is not TKIP");
826 } else {
827 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
828 return 1; /* STA entry was removed */
829 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
830 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
831 }
832
833 /*
834 * Error report is not a request for a new key handshake, but since
835 * Authenticator may do it, let's change the keys now anyway.
836 */
837 wpa_request_new_ptk(sm);
838 return 0;
839 }
840
841
842 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
843 size_t data_len)
844 {
845 struct wpa_ptk PTK;
846 int ok = 0;
847 const u8 *pmk = NULL;
848 unsigned int pmk_len;
849
850 os_memset(&PTK, 0, sizeof(PTK));
851 for (;;) {
852 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
853 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
854 sm->p2p_dev_addr, pmk);
855 if (pmk == NULL)
856 break;
857 pmk_len = PMK_LEN;
858 } else {
859 pmk = sm->PMK;
860 pmk_len = sm->pmk_len;
861 }
862
863 wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK);
864
865 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
866 == 0) {
867 ok = 1;
868 break;
869 }
870
871 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
872 break;
873 }
874
875 if (!ok) {
876 wpa_printf(MSG_DEBUG,
877 "WPA: Earlier SNonce did not result in matching MIC");
878 return -1;
879 }
880
881 wpa_printf(MSG_DEBUG,
882 "WPA: Earlier SNonce resulted in matching MIC");
883 sm->alt_snonce_valid = 0;
884 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
885 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
886 sm->PTK_valid = TRUE;
887
888 return 0;
889 }
890
891
892 void wpa_receive(struct wpa_authenticator *wpa_auth,
893 struct wpa_state_machine *sm,
894 u8 *data, size_t data_len)
895 {
896 struct ieee802_1x_hdr *hdr;
897 struct wpa_eapol_key *key;
898 u16 key_info, key_data_length;
899 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
900 SMK_M1, SMK_M3, SMK_ERROR } msg;
901 char *msgtxt;
902 struct wpa_eapol_ie_parse kde;
903 const u8 *key_data;
904 size_t keyhdrlen, mic_len;
905 u8 *mic;
906
907 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
908 return;
909 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
910
911 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
912 keyhdrlen = sizeof(*key) + mic_len + 2;
913
914 if (data_len < sizeof(*hdr) + keyhdrlen) {
915 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
916 return;
917 }
918
919 hdr = (struct ieee802_1x_hdr *) data;
920 key = (struct wpa_eapol_key *) (hdr + 1);
921 mic = (u8 *) (key + 1);
922 key_info = WPA_GET_BE16(key->key_info);
923 key_data = mic + mic_len + 2;
924 key_data_length = WPA_GET_BE16(mic + mic_len);
925 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
926 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
927 MAC2STR(sm->addr), key_info, key->type,
928 (unsigned int) mic_len, key_data_length);
929 wpa_hexdump(MSG_MSGDUMP,
930 "WPA: EAPOL-Key header (ending before Key MIC)",
931 key, sizeof(*key));
932 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
933 mic, mic_len);
934 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
935 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
936 "key_data overflow (%d > %lu)",
937 key_data_length,
938 (unsigned long) (data_len - sizeof(*hdr) -
939 keyhdrlen));
940 return;
941 }
942
943 if (sm->wpa == WPA_VERSION_WPA2) {
944 if (key->type == EAPOL_KEY_TYPE_WPA) {
945 /*
946 * Some deployed station implementations seem to send
947 * msg 4/4 with incorrect type value in WPA2 mode.
948 */
949 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
950 "with unexpected WPA type in RSN mode");
951 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
952 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
953 "unexpected type %d in RSN mode",
954 key->type);
955 return;
956 }
957 } else {
958 if (key->type != EAPOL_KEY_TYPE_WPA) {
959 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
960 "unexpected type %d in WPA mode",
961 key->type);
962 return;
963 }
964 }
965
966 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
967 WPA_NONCE_LEN);
968 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
969 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
970
971 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
972 * are set */
973
974 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
975 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
976 if (key_info & WPA_KEY_INFO_ERROR) {
977 msg = SMK_ERROR;
978 msgtxt = "SMK Error";
979 } else {
980 msg = SMK_M1;
981 msgtxt = "SMK M1";
982 }
983 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
984 msg = SMK_M3;
985 msgtxt = "SMK M3";
986 } else if (key_info & WPA_KEY_INFO_REQUEST) {
987 msg = REQUEST;
988 msgtxt = "Request";
989 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
990 msg = GROUP_2;
991 msgtxt = "2/2 Group";
992 } else if (key_data_length == 0 ||
993 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
994 key_data_length == AES_BLOCK_SIZE)) {
995 msg = PAIRWISE_4;
996 msgtxt = "4/4 Pairwise";
997 } else {
998 msg = PAIRWISE_2;
999 msgtxt = "2/4 Pairwise";
1000 }
1001
1002 /* TODO: key_info type validation for PeerKey */
1003 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
1004 msg == GROUP_2) {
1005 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1006 if (sm->pairwise == WPA_CIPHER_CCMP ||
1007 sm->pairwise == WPA_CIPHER_GCMP) {
1008 if (wpa_use_aes_cmac(sm) &&
1009 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
1010 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
1011 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1012 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1013 wpa_auth_logger(wpa_auth, sm->addr,
1014 LOGGER_WARNING,
1015 "advertised support for "
1016 "AES-128-CMAC, but did not "
1017 "use it");
1018 return;
1019 }
1020
1021 if (!wpa_use_aes_cmac(sm) &&
1022 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1023 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1024 wpa_auth_logger(wpa_auth, sm->addr,
1025 LOGGER_WARNING,
1026 "did not use HMAC-SHA1-AES "
1027 "with CCMP/GCMP");
1028 return;
1029 }
1030 }
1031
1032 if ((wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1033 wpa_key_mgmt_fils(sm->wpa_key_mgmt)) &&
1034 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1035 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1036 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1037 return;
1038 }
1039 }
1040
1041 if (key_info & WPA_KEY_INFO_REQUEST) {
1042 if (sm->req_replay_counter_used &&
1043 os_memcmp(key->replay_counter, sm->req_replay_counter,
1044 WPA_REPLAY_COUNTER_LEN) <= 0) {
1045 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1046 "received EAPOL-Key request with "
1047 "replayed counter");
1048 return;
1049 }
1050 }
1051
1052 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1053 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1054 int i;
1055
1056 if (msg == PAIRWISE_2 &&
1057 wpa_replay_counter_valid(sm->prev_key_replay,
1058 key->replay_counter) &&
1059 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1060 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1061 {
1062 /*
1063 * Some supplicant implementations (e.g., Windows XP
1064 * WZC) update SNonce for each EAPOL-Key 2/4. This
1065 * breaks the workaround on accepting any of the
1066 * pending requests, so allow the SNonce to be updated
1067 * even if we have already sent out EAPOL-Key 3/4.
1068 */
1069 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1070 "Process SNonce update from STA "
1071 "based on retransmitted EAPOL-Key "
1072 "1/4");
1073 sm->update_snonce = 1;
1074 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1075 sm->alt_snonce_valid = TRUE;
1076 os_memcpy(sm->alt_replay_counter,
1077 sm->key_replay[0].counter,
1078 WPA_REPLAY_COUNTER_LEN);
1079 goto continue_processing;
1080 }
1081
1082 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1083 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1084 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1085 WPA_REPLAY_COUNTER_LEN) == 0) {
1086 /*
1087 * Supplicant may still be using the old SNonce since
1088 * there was two EAPOL-Key 2/4 messages and they had
1089 * different SNonce values.
1090 */
1091 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1092 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1093 goto continue_processing;
1094 }
1095
1096 if (msg == PAIRWISE_2 &&
1097 wpa_replay_counter_valid(sm->prev_key_replay,
1098 key->replay_counter) &&
1099 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1100 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1101 "ignore retransmitted EAPOL-Key %s - "
1102 "SNonce did not change", msgtxt);
1103 } else {
1104 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1105 "received EAPOL-Key %s with "
1106 "unexpected replay counter", msgtxt);
1107 }
1108 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1109 if (!sm->key_replay[i].valid)
1110 break;
1111 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1112 sm->key_replay[i].counter,
1113 WPA_REPLAY_COUNTER_LEN);
1114 }
1115 wpa_hexdump(MSG_DEBUG, "received replay counter",
1116 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1117 return;
1118 }
1119
1120 continue_processing:
1121 #ifdef CONFIG_FILS
1122 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1123 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1124 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1125 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1126 return;
1127 }
1128 #endif /* CONFIG_FILS */
1129
1130 switch (msg) {
1131 case PAIRWISE_2:
1132 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1133 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1134 (!sm->update_snonce ||
1135 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1136 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1137 "received EAPOL-Key msg 2/4 in "
1138 "invalid state (%d) - dropped",
1139 sm->wpa_ptk_state);
1140 return;
1141 }
1142 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1143 if (sm->group->reject_4way_hs_for_entropy) {
1144 /*
1145 * The system did not have enough entropy to generate
1146 * strong random numbers. Reject the first 4-way
1147 * handshake(s) and collect some entropy based on the
1148 * information from it. Once enough entropy is
1149 * available, the next atempt will trigger GMK/Key
1150 * Counter update and the station will be allowed to
1151 * continue.
1152 */
1153 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1154 "collect more entropy for random number "
1155 "generation");
1156 random_mark_pool_ready();
1157 wpa_sta_disconnect(wpa_auth, sm->addr);
1158 return;
1159 }
1160 break;
1161 case PAIRWISE_4:
1162 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1163 !sm->PTK_valid) {
1164 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1165 "received EAPOL-Key msg 4/4 in "
1166 "invalid state (%d) - dropped",
1167 sm->wpa_ptk_state);
1168 return;
1169 }
1170 break;
1171 case GROUP_2:
1172 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1173 || !sm->PTK_valid) {
1174 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1175 "received EAPOL-Key msg 2/2 in "
1176 "invalid state (%d) - dropped",
1177 sm->wpa_ptk_group_state);
1178 return;
1179 }
1180 break;
1181 #ifdef CONFIG_PEERKEY
1182 case SMK_M1:
1183 case SMK_M3:
1184 case SMK_ERROR:
1185 if (!wpa_auth->conf.peerkey) {
1186 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1187 "PeerKey use disabled - ignoring message");
1188 return;
1189 }
1190 if (!sm->PTK_valid) {
1191 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1192 "received EAPOL-Key msg SMK in "
1193 "invalid state - dropped");
1194 return;
1195 }
1196 break;
1197 #else /* CONFIG_PEERKEY */
1198 case SMK_M1:
1199 case SMK_M3:
1200 case SMK_ERROR:
1201 return; /* STSL disabled - ignore SMK messages */
1202 #endif /* CONFIG_PEERKEY */
1203 case REQUEST:
1204 break;
1205 }
1206
1207 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1208 "received EAPOL-Key frame (%s)", msgtxt);
1209
1210 if (key_info & WPA_KEY_INFO_ACK) {
1211 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1212 "received invalid EAPOL-Key: Key Ack set");
1213 return;
1214 }
1215
1216 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1217 !(key_info & WPA_KEY_INFO_MIC)) {
1218 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1219 "received invalid EAPOL-Key: Key MIC not set");
1220 return;
1221 }
1222
1223 #ifdef CONFIG_FILS
1224 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1225 (key_info & WPA_KEY_INFO_MIC)) {
1226 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1227 "received invalid EAPOL-Key: Key MIC set");
1228 return;
1229 }
1230 #endif /* CONFIG_FILS */
1231
1232 sm->MICVerified = FALSE;
1233 if (sm->PTK_valid && !sm->update_snonce) {
1234 if (mic_len &&
1235 wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
1236 data_len) &&
1237 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1238 wpa_try_alt_snonce(sm, data, data_len))) {
1239 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1240 "received EAPOL-Key with invalid MIC");
1241 return;
1242 }
1243 #ifdef CONFIG_FILS
1244 if (!mic_len &&
1245 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1246 &key_data_length) < 0) {
1247 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1248 "received EAPOL-Key with invalid MIC");
1249 return;
1250 }
1251 #endif /* CONFIG_FILS */
1252 sm->MICVerified = TRUE;
1253 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1254 sm->pending_1_of_4_timeout = 0;
1255 }
1256
1257 if (key_info & WPA_KEY_INFO_REQUEST) {
1258 if (sm->MICVerified) {
1259 sm->req_replay_counter_used = 1;
1260 os_memcpy(sm->req_replay_counter, key->replay_counter,
1261 WPA_REPLAY_COUNTER_LEN);
1262 } else {
1263 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1264 "received EAPOL-Key request with "
1265 "invalid MIC");
1266 return;
1267 }
1268
1269 /*
1270 * TODO: should decrypt key data field if encryption was used;
1271 * even though MAC address KDE is not normally encrypted,
1272 * supplicant is allowed to encrypt it.
1273 */
1274 if (msg == SMK_ERROR) {
1275 #ifdef CONFIG_PEERKEY
1276 wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
1277 #endif /* CONFIG_PEERKEY */
1278 return;
1279 } else if (key_info & WPA_KEY_INFO_ERROR) {
1280 if (wpa_receive_error_report(
1281 wpa_auth, sm,
1282 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1283 return; /* STA entry was removed */
1284 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1285 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1286 "received EAPOL-Key Request for new "
1287 "4-Way Handshake");
1288 wpa_request_new_ptk(sm);
1289 #ifdef CONFIG_PEERKEY
1290 } else if (msg == SMK_M1) {
1291 wpa_smk_m1(wpa_auth, sm, key, key_data,
1292 key_data_length);
1293 #endif /* CONFIG_PEERKEY */
1294 } else if (key_data_length > 0 &&
1295 wpa_parse_kde_ies(key_data, key_data_length,
1296 &kde) == 0 &&
1297 kde.mac_addr) {
1298 } else {
1299 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1300 "received EAPOL-Key Request for GTK "
1301 "rekeying");
1302 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1303 wpa_rekey_gtk(wpa_auth, NULL);
1304 }
1305 } else {
1306 /* Do not allow the same key replay counter to be reused. */
1307 wpa_replay_counter_mark_invalid(sm->key_replay,
1308 key->replay_counter);
1309
1310 if (msg == PAIRWISE_2) {
1311 /*
1312 * Maintain a copy of the pending EAPOL-Key frames in
1313 * case the EAPOL-Key frame was retransmitted. This is
1314 * needed to allow EAPOL-Key msg 2/4 reply to another
1315 * pending msg 1/4 to update the SNonce to work around
1316 * unexpected supplicant behavior.
1317 */
1318 os_memcpy(sm->prev_key_replay, sm->key_replay,
1319 sizeof(sm->key_replay));
1320 } else {
1321 os_memset(sm->prev_key_replay, 0,
1322 sizeof(sm->prev_key_replay));
1323 }
1324
1325 /*
1326 * Make sure old valid counters are not accepted anymore and
1327 * do not get copied again.
1328 */
1329 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1330 }
1331
1332 #ifdef CONFIG_PEERKEY
1333 if (msg == SMK_M3) {
1334 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
1335 return;
1336 }
1337 #endif /* CONFIG_PEERKEY */
1338
1339 os_free(sm->last_rx_eapol_key);
1340 sm->last_rx_eapol_key = os_malloc(data_len);
1341 if (sm->last_rx_eapol_key == NULL)
1342 return;
1343 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1344 sm->last_rx_eapol_key_len = data_len;
1345
1346 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1347 sm->EAPOLKeyReceived = TRUE;
1348 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1349 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1350 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1351 wpa_sm_step(sm);
1352 }
1353
1354
1355 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1356 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1357 {
1358 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1359 u8 *pos;
1360 int ret = 0;
1361
1362 /* GTK = PRF-X(GMK, "Group key expansion",
1363 * AA || GNonce || Time || random data)
1364 * The example described in the IEEE 802.11 standard uses only AA and
1365 * GNonce as inputs here. Add some more entropy since this derivation
1366 * is done only at the Authenticator and as such, does not need to be
1367 * exactly same.
1368 */
1369 os_memcpy(data, addr, ETH_ALEN);
1370 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1371 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1372 wpa_get_ntp_timestamp(pos);
1373 pos += 8;
1374 if (random_get_bytes(pos, 16) < 0)
1375 ret = -1;
1376
1377 #ifdef CONFIG_IEEE80211W
1378 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1379 #else /* CONFIG_IEEE80211W */
1380 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1381 < 0)
1382 ret = -1;
1383 #endif /* CONFIG_IEEE80211W */
1384
1385 return ret;
1386 }
1387
1388
1389 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1390 {
1391 struct wpa_authenticator *wpa_auth = eloop_ctx;
1392 struct wpa_state_machine *sm = timeout_ctx;
1393
1394 sm->pending_1_of_4_timeout = 0;
1395 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1396 sm->TimeoutEvt = TRUE;
1397 wpa_sm_step(sm);
1398 }
1399
1400
1401 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1402 struct wpa_state_machine *sm, int key_info,
1403 const u8 *key_rsc, const u8 *nonce,
1404 const u8 *kde, size_t kde_len,
1405 int keyidx, int encr, int force_version)
1406 {
1407 struct ieee802_1x_hdr *hdr;
1408 struct wpa_eapol_key *key;
1409 size_t len, mic_len, keyhdrlen;
1410 int alg;
1411 int key_data_len, pad_len = 0;
1412 u8 *buf, *pos;
1413 int version, pairwise;
1414 int i;
1415 u8 *key_mic, *key_data;
1416
1417 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
1418 keyhdrlen = sizeof(*key) + mic_len + 2;
1419
1420 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1421
1422 if (force_version)
1423 version = force_version;
1424 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1425 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1426 wpa_key_mgmt_fils(sm->wpa_key_mgmt))
1427 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1428 else if (wpa_use_aes_cmac(sm))
1429 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1430 else if (sm->pairwise != WPA_CIPHER_TKIP)
1431 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1432 else
1433 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1434
1435 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1436
1437 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1438 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1439 "encr=%d)",
1440 version,
1441 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1442 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1443 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1444 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1445 pairwise, (unsigned long) kde_len, keyidx, encr);
1446
1447 key_data_len = kde_len;
1448
1449 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1450 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1451 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1452 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1453 pad_len = key_data_len % 8;
1454 if (pad_len)
1455 pad_len = 8 - pad_len;
1456 key_data_len += pad_len + 8;
1457 }
1458
1459 len += key_data_len;
1460 if (!mic_len && encr)
1461 len += AES_BLOCK_SIZE;
1462
1463 hdr = os_zalloc(len);
1464 if (hdr == NULL)
1465 return;
1466 hdr->version = wpa_auth->conf.eapol_version;
1467 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1468 hdr->length = host_to_be16(len - sizeof(*hdr));
1469 key = (struct wpa_eapol_key *) (hdr + 1);
1470 key_mic = (u8 *) (key + 1);
1471 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1472
1473 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1474 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1475 key_info |= version;
1476 if (encr && sm->wpa == WPA_VERSION_WPA2)
1477 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1478 if (sm->wpa != WPA_VERSION_WPA2)
1479 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1480 WPA_PUT_BE16(key->key_info, key_info);
1481
1482 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1483 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1484 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1485 WPA_PUT_BE16(key->key_length, 0);
1486
1487 /* FIX: STSL: what to use as key_replay_counter? */
1488 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1489 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1490 os_memcpy(sm->key_replay[i].counter,
1491 sm->key_replay[i - 1].counter,
1492 WPA_REPLAY_COUNTER_LEN);
1493 }
1494 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1495 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1496 WPA_REPLAY_COUNTER_LEN);
1497 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1498 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1499 sm->key_replay[0].valid = TRUE;
1500
1501 if (nonce)
1502 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1503
1504 if (key_rsc)
1505 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1506
1507 if (kde && !encr) {
1508 os_memcpy(key_data, kde, kde_len);
1509 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1510 #ifdef CONFIG_FILS
1511 } else if (!mic_len) {
1512 const u8 *aad[1];
1513 size_t aad_len[1];
1514
1515 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1516 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1517 kde, kde_len);
1518
1519 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1520 sm->PTK.kek, sm->PTK.kek_len);
1521 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1522 * to Key Data (exclusive). */
1523 aad[0] = (u8 *) hdr;
1524 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1525 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1526 1, aad, aad_len, key_mic + 2) < 0) {
1527 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1528 return;
1529 }
1530
1531 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1532 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1533 #endif /* CONFIG_FILS */
1534 } else if (encr && kde) {
1535 buf = os_zalloc(key_data_len);
1536 if (buf == NULL) {
1537 os_free(hdr);
1538 return;
1539 }
1540 pos = buf;
1541 os_memcpy(pos, kde, kde_len);
1542 pos += kde_len;
1543
1544 if (pad_len)
1545 *pos++ = 0xdd;
1546
1547 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1548 buf, key_data_len);
1549 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1550 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1551 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1552 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1553 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1554 (key_data_len - 8) / 8, buf, key_data)) {
1555 os_free(hdr);
1556 os_free(buf);
1557 return;
1558 }
1559 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1560 #ifndef CONFIG_NO_RC4
1561 } else if (sm->PTK.kek_len == 16) {
1562 u8 ek[32];
1563 os_memcpy(key->key_iv,
1564 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1565 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1566 os_memcpy(ek, key->key_iv, 16);
1567 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1568 os_memcpy(key_data, buf, key_data_len);
1569 rc4_skip(ek, 32, 256, key_data, key_data_len);
1570 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1571 #endif /* CONFIG_NO_RC4 */
1572 } else {
1573 os_free(hdr);
1574 os_free(buf);
1575 return;
1576 }
1577 os_free(buf);
1578 }
1579
1580 if (key_info & WPA_KEY_INFO_MIC) {
1581 if (!sm->PTK_valid || !mic_len) {
1582 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1583 "PTK not valid when sending EAPOL-Key "
1584 "frame");
1585 os_free(hdr);
1586 return;
1587 }
1588
1589 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1590 sm->wpa_key_mgmt, version,
1591 (u8 *) hdr, len, key_mic);
1592 #ifdef CONFIG_TESTING_OPTIONS
1593 if (!pairwise &&
1594 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1595 drand48() <
1596 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1597 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1598 "Corrupting group EAPOL-Key Key MIC");
1599 key_mic[0]++;
1600 }
1601 #endif /* CONFIG_TESTING_OPTIONS */
1602 }
1603
1604 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1605 1);
1606 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1607 sm->pairwise_set);
1608 os_free(hdr);
1609 }
1610
1611
1612 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1613 struct wpa_state_machine *sm, int key_info,
1614 const u8 *key_rsc, const u8 *nonce,
1615 const u8 *kde, size_t kde_len,
1616 int keyidx, int encr)
1617 {
1618 int timeout_ms;
1619 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1620 int ctr;
1621
1622 if (sm == NULL)
1623 return;
1624
1625 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1626 keyidx, encr, 0);
1627
1628 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1629 if (ctr == 1 && wpa_auth->conf.tx_status)
1630 timeout_ms = pairwise ? eapol_key_timeout_first :
1631 eapol_key_timeout_first_group;
1632 else
1633 timeout_ms = eapol_key_timeout_subseq;
1634 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1635 sm->pending_1_of_4_timeout = 1;
1636 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1637 "counter %d)", timeout_ms, ctr);
1638 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1639 wpa_send_eapol_timeout, wpa_auth, sm);
1640 }
1641
1642
1643 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
1644 size_t data_len)
1645 {
1646 struct ieee802_1x_hdr *hdr;
1647 struct wpa_eapol_key *key;
1648 u16 key_info;
1649 int ret = 0;
1650 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1651 size_t mic_len = wpa_mic_len(akmp);
1652
1653 if (data_len < sizeof(*hdr) + sizeof(*key))
1654 return -1;
1655
1656 hdr = (struct ieee802_1x_hdr *) data;
1657 key = (struct wpa_eapol_key *) (hdr + 1);
1658 mic_pos = (u8 *) (key + 1);
1659 key_info = WPA_GET_BE16(key->key_info);
1660 os_memcpy(mic, mic_pos, mic_len);
1661 os_memset(mic_pos, 0, mic_len);
1662 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1663 key_info & WPA_KEY_INFO_TYPE_MASK,
1664 data, data_len, mic_pos) ||
1665 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1666 ret = -1;
1667 os_memcpy(mic_pos, mic, mic_len);
1668 return ret;
1669 }
1670
1671
1672 void wpa_remove_ptk(struct wpa_state_machine *sm)
1673 {
1674 sm->PTK_valid = FALSE;
1675 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1676 if (wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL,
1677 0))
1678 wpa_printf(MSG_DEBUG,
1679 "RSN: PTK removal from the driver failed");
1680 sm->pairwise_set = FALSE;
1681 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1682 }
1683
1684
1685 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1686 {
1687 int remove_ptk = 1;
1688
1689 if (sm == NULL)
1690 return -1;
1691
1692 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1693 "event %d notification", event);
1694
1695 switch (event) {
1696 case WPA_AUTH:
1697 #ifdef CONFIG_MESH
1698 /* PTKs are derived through AMPE */
1699 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1700 /* not mesh */
1701 break;
1702 }
1703 return 0;
1704 #endif /* CONFIG_MESH */
1705 case WPA_ASSOC:
1706 break;
1707 case WPA_DEAUTH:
1708 case WPA_DISASSOC:
1709 sm->DeauthenticationRequest = TRUE;
1710 break;
1711 case WPA_REAUTH:
1712 case WPA_REAUTH_EAPOL:
1713 if (!sm->started) {
1714 /*
1715 * When using WPS, we may end up here if the STA
1716 * manages to re-associate without the previous STA
1717 * entry getting removed. Consequently, we need to make
1718 * sure that the WPA state machines gets initialized
1719 * properly at this point.
1720 */
1721 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1722 "started - initialize now");
1723 sm->started = 1;
1724 sm->Init = TRUE;
1725 if (wpa_sm_step(sm) == 1)
1726 return 1; /* should not really happen */
1727 sm->Init = FALSE;
1728 sm->AuthenticationRequest = TRUE;
1729 break;
1730 }
1731 if (sm->GUpdateStationKeys) {
1732 /*
1733 * Reauthentication cancels the pending group key
1734 * update for this STA.
1735 */
1736 sm->group->GKeyDoneStations--;
1737 sm->GUpdateStationKeys = FALSE;
1738 sm->PtkGroupInit = TRUE;
1739 }
1740 sm->ReAuthenticationRequest = TRUE;
1741 break;
1742 case WPA_ASSOC_FT:
1743 #ifdef CONFIG_IEEE80211R
1744 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1745 "after association");
1746 wpa_ft_install_ptk(sm);
1747
1748 /* Using FT protocol, not WPA auth state machine */
1749 sm->ft_completed = 1;
1750 return 0;
1751 #else /* CONFIG_IEEE80211R */
1752 break;
1753 #endif /* CONFIG_IEEE80211R */
1754 }
1755
1756 #ifdef CONFIG_IEEE80211R
1757 sm->ft_completed = 0;
1758 #endif /* CONFIG_IEEE80211R */
1759
1760 #ifdef CONFIG_IEEE80211W
1761 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1762 remove_ptk = 0;
1763 #endif /* CONFIG_IEEE80211W */
1764 #ifdef CONFIG_FILS
1765 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1766 (event == WPA_AUTH || event == WPA_ASSOC))
1767 remove_ptk = 0;
1768 #endif /* CONFIG_FILS */
1769
1770 if (remove_ptk) {
1771 sm->PTK_valid = FALSE;
1772 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1773
1774 if (event != WPA_REAUTH_EAPOL)
1775 wpa_remove_ptk(sm);
1776 }
1777
1778 if (sm->in_step_loop) {
1779 /*
1780 * wpa_sm_step() is already running - avoid recursive call to
1781 * it by making the existing loop process the new update.
1782 */
1783 sm->changed = TRUE;
1784 return 0;
1785 }
1786 return wpa_sm_step(sm);
1787 }
1788
1789
1790 SM_STATE(WPA_PTK, INITIALIZE)
1791 {
1792 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1793 if (sm->Init) {
1794 /* Init flag is not cleared here, so avoid busy
1795 * loop by claiming nothing changed. */
1796 sm->changed = FALSE;
1797 }
1798
1799 sm->keycount = 0;
1800 if (sm->GUpdateStationKeys)
1801 sm->group->GKeyDoneStations--;
1802 sm->GUpdateStationKeys = FALSE;
1803 if (sm->wpa == WPA_VERSION_WPA)
1804 sm->PInitAKeys = FALSE;
1805 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1806 * Local AA > Remote AA)) */) {
1807 sm->Pair = TRUE;
1808 }
1809 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1810 wpa_remove_ptk(sm);
1811 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1812 sm->TimeoutCtr = 0;
1813 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1814 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1815 WPA_EAPOL_authorized, 0);
1816 }
1817 }
1818
1819
1820 SM_STATE(WPA_PTK, DISCONNECT)
1821 {
1822 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1823 sm->Disconnect = FALSE;
1824 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1825 }
1826
1827
1828 SM_STATE(WPA_PTK, DISCONNECTED)
1829 {
1830 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1831 sm->DeauthenticationRequest = FALSE;
1832 }
1833
1834
1835 SM_STATE(WPA_PTK, AUTHENTICATION)
1836 {
1837 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1838 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1839 sm->PTK_valid = FALSE;
1840 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1841 1);
1842 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1843 sm->AuthenticationRequest = FALSE;
1844 }
1845
1846
1847 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1848 struct wpa_group *group)
1849 {
1850 if (group->first_sta_seen)
1851 return;
1852 /*
1853 * System has run bit further than at the time hostapd was started
1854 * potentially very early during boot up. This provides better chances
1855 * of collecting more randomness on embedded systems. Re-initialize the
1856 * GMK and Counter here to improve their strength if there was not
1857 * enough entropy available immediately after system startup.
1858 */
1859 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1860 "station");
1861 if (random_pool_ready() != 1) {
1862 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1863 "to proceed - reject first 4-way handshake");
1864 group->reject_4way_hs_for_entropy = TRUE;
1865 } else {
1866 group->first_sta_seen = TRUE;
1867 group->reject_4way_hs_for_entropy = FALSE;
1868 }
1869
1870 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1871 wpa_gtk_update(wpa_auth, group) < 0 ||
1872 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1873 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1874 group->first_sta_seen = FALSE;
1875 group->reject_4way_hs_for_entropy = TRUE;
1876 }
1877 }
1878
1879
1880 SM_STATE(WPA_PTK, AUTHENTICATION2)
1881 {
1882 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1883
1884 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1885 sm->ReAuthenticationRequest = FALSE;
1886
1887 /*
1888 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1889 * ambiguous. The Authenticator state machine uses a counter that is
1890 * incremented by one for each 4-way handshake. However, the security
1891 * analysis of 4-way handshake points out that unpredictable nonces
1892 * help in preventing precomputation attacks. Instead of the state
1893 * machine definition, use an unpredictable nonce value here to provide
1894 * stronger protection against potential precomputation attacks.
1895 */
1896 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1897 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1898 "ANonce.");
1899 sm->Disconnect = TRUE;
1900 return;
1901 }
1902 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1903 WPA_NONCE_LEN);
1904 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1905 * logical place than INITIALIZE since AUTHENTICATION2 can be
1906 * re-entered on ReAuthenticationRequest without going through
1907 * INITIALIZE. */
1908 sm->TimeoutCtr = 0;
1909 }
1910
1911
1912 SM_STATE(WPA_PTK, INITPMK)
1913 {
1914 u8 msk[2 * PMK_LEN];
1915 size_t len = 2 * PMK_LEN;
1916
1917 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1918 #ifdef CONFIG_IEEE80211R
1919 sm->xxkey_len = 0;
1920 #endif /* CONFIG_IEEE80211R */
1921 if (sm->pmksa) {
1922 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1923 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
1924 sm->pmk_len = sm->pmksa->pmk_len;
1925 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1926 unsigned int pmk_len;
1927
1928 if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
1929 pmk_len = PMK_LEN_SUITE_B_192;
1930 else
1931 pmk_len = PMK_LEN;
1932 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1933 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
1934 pmk_len);
1935 if (len < pmk_len) {
1936 wpa_printf(MSG_DEBUG,
1937 "WPA: MSK not long enough (%u) to create PMK (%u)",
1938 (unsigned int) len, (unsigned int) pmk_len);
1939 sm->Disconnect = TRUE;
1940 return;
1941 }
1942 os_memcpy(sm->PMK, msk, pmk_len);
1943 sm->pmk_len = pmk_len;
1944 #ifdef CONFIG_IEEE80211R
1945 if (len >= 2 * PMK_LEN) {
1946 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1947 sm->xxkey_len = PMK_LEN;
1948 }
1949 #endif /* CONFIG_IEEE80211R */
1950 } else {
1951 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
1952 sm->wpa_auth->cb.get_msk);
1953 sm->Disconnect = TRUE;
1954 return;
1955 }
1956 os_memset(msk, 0, sizeof(msk));
1957
1958 sm->req_replay_counter_used = 0;
1959 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1960 * will break reauthentication since EAPOL state machines may not be
1961 * get into AUTHENTICATING state that clears keyRun before WPA state
1962 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1963 * state and takes PMK from the previously used AAA Key. This will
1964 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1965 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1966 * be good workaround for this issue. */
1967 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1968 }
1969
1970
1971 SM_STATE(WPA_PTK, INITPSK)
1972 {
1973 const u8 *psk;
1974 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1975 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1976 if (psk) {
1977 os_memcpy(sm->PMK, psk, PMK_LEN);
1978 sm->pmk_len = PMK_LEN;
1979 #ifdef CONFIG_IEEE80211R
1980 os_memcpy(sm->xxkey, psk, PMK_LEN);
1981 sm->xxkey_len = PMK_LEN;
1982 #endif /* CONFIG_IEEE80211R */
1983 }
1984 sm->req_replay_counter_used = 0;
1985 }
1986
1987
1988 SM_STATE(WPA_PTK, PTKSTART)
1989 {
1990 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1991 size_t pmkid_len = 0;
1992
1993 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1994 sm->PTKRequest = FALSE;
1995 sm->TimeoutEvt = FALSE;
1996 sm->alt_snonce_valid = FALSE;
1997
1998 sm->TimeoutCtr++;
1999 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
2000 /* No point in sending the EAPOL-Key - we will disconnect
2001 * immediately following this. */
2002 return;
2003 }
2004
2005 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2006 "sending 1/4 msg of 4-Way Handshake");
2007 /*
2008 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
2009 * one possible PSK for this STA.
2010 */
2011 if (sm->wpa == WPA_VERSION_WPA2 &&
2012 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2013 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
2014 pmkid = buf;
2015 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
2016 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
2017 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
2018 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2019 if (sm->pmksa) {
2020 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2021 sm->pmksa->pmkid, PMKID_LEN);
2022 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2023 /* No KCK available to derive PMKID */
2024 pmkid = NULL;
2025 } else {
2026 /*
2027 * Calculate PMKID since no PMKSA cache entry was
2028 * available with pre-calculated PMKID.
2029 */
2030 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2031 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2032 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
2033 }
2034 }
2035 wpa_send_eapol(sm->wpa_auth, sm,
2036 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2037 sm->ANonce, pmkid, pmkid_len, 0, 0);
2038 }
2039
2040
2041 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2042 const u8 *pmk, unsigned int pmk_len,
2043 struct wpa_ptk *ptk)
2044 {
2045 #ifdef CONFIG_IEEE80211R
2046 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2047 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2048 #endif /* CONFIG_IEEE80211R */
2049
2050 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2051 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2052 ptk, sm->wpa_key_mgmt, sm->pairwise);
2053 }
2054
2055
2056 #ifdef CONFIG_FILS
2057
2058 int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
2059 size_t pmk_len, const u8 *snonce, const u8 *anonce)
2060 {
2061 u8 ick[FILS_ICK_MAX_LEN];
2062 size_t ick_len;
2063 int res;
2064
2065 res = fils_pmk_to_ptk(pmk, pmk_len, sm->addr, sm->wpa_auth->addr,
2066 snonce, anonce, &sm->PTK, ick, &ick_len,
2067 sm->wpa_key_mgmt, sm->pairwise);
2068 if (res < 0)
2069 return res;
2070 sm->PTK_valid = TRUE;
2071
2072 res = fils_key_auth_sk(ick, ick_len, snonce, anonce,
2073 sm->addr, sm->wpa_auth->addr,
2074 NULL, 0, NULL, 0, /* TODO: SK+PFS */
2075 sm->wpa_key_mgmt, sm->fils_key_auth_sta,
2076 sm->fils_key_auth_ap,
2077 &sm->fils_key_auth_len);
2078 os_memset(ick, 0, sizeof(ick));
2079
2080 /* Store nonces for (Re)Association Request/Response frame processing */
2081 os_memcpy(sm->SNonce, snonce, FILS_NONCE_LEN);
2082 os_memcpy(sm->ANonce, anonce, FILS_NONCE_LEN);
2083
2084 return res;
2085 }
2086
2087
2088 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2089 u8 *buf, size_t buf_len, u16 *_key_data_len)
2090 {
2091 struct ieee802_1x_hdr *hdr;
2092 struct wpa_eapol_key *key;
2093 u8 *pos;
2094 u16 key_data_len;
2095 u8 *tmp;
2096 const u8 *aad[1];
2097 size_t aad_len[1];
2098
2099 hdr = (struct ieee802_1x_hdr *) buf;
2100 key = (struct wpa_eapol_key *) (hdr + 1);
2101 pos = (u8 *) (key + 1);
2102 key_data_len = WPA_GET_BE16(pos);
2103 if (key_data_len < AES_BLOCK_SIZE ||
2104 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2105 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2106 "No room for AES-SIV data in the frame");
2107 return -1;
2108 }
2109 pos += 2; /* Pointing at the Encrypted Key Data field */
2110
2111 tmp = os_malloc(key_data_len);
2112 if (!tmp)
2113 return -1;
2114
2115 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2116 * to Key Data (exclusive). */
2117 aad[0] = buf;
2118 aad_len[0] = pos - buf;
2119 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2120 1, aad, aad_len, tmp) < 0) {
2121 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2122 "Invalid AES-SIV data in the frame");
2123 bin_clear_free(tmp, key_data_len);
2124 return -1;
2125 }
2126
2127 /* AEAD decryption and validation completed successfully */
2128 key_data_len -= AES_BLOCK_SIZE;
2129 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2130 tmp, key_data_len);
2131
2132 /* Replace Key Data field with the decrypted version */
2133 os_memcpy(pos, tmp, key_data_len);
2134 pos -= 2; /* Key Data Length field */
2135 WPA_PUT_BE16(pos, key_data_len);
2136 bin_clear_free(tmp, key_data_len);
2137 if (_key_data_len)
2138 *_key_data_len = key_data_len;
2139 return 0;
2140 }
2141
2142
2143 int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
2144 const struct ieee80211_mgmt *mgmt, size_t frame_len,
2145 u8 *pos, size_t left)
2146 {
2147 u16 fc, stype;
2148 const u8 *end, *ie_start, *ie, *session, *crypt;
2149 struct ieee802_11_elems elems;
2150 const u8 *aad[5];
2151 size_t aad_len[5];
2152
2153 if (!sm || !sm->PTK_valid) {
2154 wpa_printf(MSG_DEBUG,
2155 "FILS: No KEK to decrypt Assocication Request frame");
2156 return -1;
2157 }
2158
2159 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2160 wpa_printf(MSG_DEBUG,
2161 "FILS: Not a FILS AKM - reject association");
2162 return -1;
2163 }
2164
2165 end = ((const u8 *) mgmt) + frame_len;
2166 fc = le_to_host16(mgmt->frame_control);
2167 stype = WLAN_FC_GET_STYPE(fc);
2168 if (stype == WLAN_FC_STYPE_REASSOC_REQ)
2169 ie_start = mgmt->u.reassoc_req.variable;
2170 else
2171 ie_start = mgmt->u.assoc_req.variable;
2172 ie = ie_start;
2173
2174 /*
2175 * Find FILS Session element which is the last unencrypted element in
2176 * the frame.
2177 */
2178 session = NULL;
2179 while (ie + 1 < end) {
2180 if (ie + 2 + ie[1] > end)
2181 break;
2182 if (ie[0] == WLAN_EID_EXTENSION &&
2183 ie[1] >= 1 + FILS_SESSION_LEN &&
2184 ie[2] == WLAN_EID_EXT_FILS_SESSION) {
2185 session = ie;
2186 break;
2187 }
2188 ie += 2 + ie[1];
2189 }
2190
2191 if (!session) {
2192 wpa_printf(MSG_DEBUG,
2193 "FILS: Could not find FILS Session element in Association Request frame - reject");
2194 return -1;
2195 }
2196 if (os_memcmp(fils_session, session + 3, FILS_SESSION_LEN) != 0) {
2197 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
2198 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
2199 fils_session, FILS_SESSION_LEN);
2200 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
2201 session + 3, FILS_SESSION_LEN);
2202 return -1;
2203 }
2204 crypt = session + 2 + session[1];
2205
2206 if (end - crypt < AES_BLOCK_SIZE) {
2207 wpa_printf(MSG_DEBUG,
2208 "FILS: Too short frame to include AES-SIV data");
2209 return -1;
2210 }
2211
2212 /* AES-SIV AAD vectors */
2213
2214 /* The STA's MAC address */
2215 aad[0] = mgmt->sa;
2216 aad_len[0] = ETH_ALEN;
2217 /* The AP's BSSID */
2218 aad[1] = mgmt->da;
2219 aad_len[1] = ETH_ALEN;
2220 /* The STA's nonce */
2221 aad[2] = sm->SNonce;
2222 aad_len[2] = FILS_NONCE_LEN;
2223 /* The AP's nonce */
2224 aad[3] = sm->ANonce;
2225 aad_len[3] = FILS_NONCE_LEN;
2226 /*
2227 * The (Re)Association Request frame from the Capability Information
2228 * field to the FILS Session element (both inclusive).
2229 */
2230 aad[4] = (const u8 *) &mgmt->u.assoc_req.capab_info;
2231 aad_len[4] = crypt - aad[0];
2232
2233 if (aes_siv_decrypt(sm->PTK.kek, sm->PTK.kek_len, crypt, end - crypt,
2234 1, aad, aad_len, pos + (crypt - ie_start)) < 0) {
2235 wpa_printf(MSG_DEBUG,
2236 "FILS: Invalid AES-SIV data in the frame");
2237 return -1;
2238 }
2239 wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
2240 pos, left - AES_BLOCK_SIZE);
2241
2242 if (ieee802_11_parse_elems(pos, left - AES_BLOCK_SIZE, &elems, 1) ==
2243 ParseFailed) {
2244 wpa_printf(MSG_DEBUG,
2245 "FILS: Failed to parse decrypted elements");
2246 return -1;
2247 }
2248 if (!elems.fils_key_confirm) {
2249 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
2250 return -1;
2251 }
2252 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
2253 wpa_printf(MSG_DEBUG,
2254 "FILS: Unexpected Key-Auth length %d (expected %d)",
2255 elems.fils_key_confirm_len,
2256 (int) sm->fils_key_auth_len);
2257 return -1;
2258 }
2259 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
2260 sm->fils_key_auth_len) != 0) {
2261 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
2262 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
2263 elems.fils_key_confirm,
2264 elems.fils_key_confirm_len);
2265 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
2266 sm->fils_key_auth_sta, sm->fils_key_auth_len);
2267 return -1;
2268 }
2269
2270 return left - AES_BLOCK_SIZE;
2271 }
2272
2273
2274 int fils_encrypt_assoc(struct wpa_state_machine *sm, u8 *buf,
2275 size_t current_len, size_t max_len)
2276 {
2277 u8 *end = buf + max_len;
2278 u8 *pos = buf + current_len;
2279 struct ieee80211_mgmt *mgmt;
2280 struct wpabuf *plain;
2281 u8 *len, *tmp, *tmp2;
2282 u8 hdr[2];
2283 u8 *gtk, dummy_gtk[32];
2284 size_t gtk_len;
2285 struct wpa_group *gsm;
2286 const u8 *aad[5];
2287 size_t aad_len[5];
2288
2289 if (!sm || !sm->PTK_valid)
2290 return -1;
2291
2292 wpa_hexdump(MSG_DEBUG,
2293 "FILS: Association Response frame before FILS processing",
2294 buf, current_len);
2295
2296 mgmt = (struct ieee80211_mgmt *) buf;
2297
2298 /* AES-SIV AAD vectors */
2299
2300 /* The AP's BSSID */
2301 aad[0] = mgmt->sa;
2302 aad_len[0] = ETH_ALEN;
2303 /* The STA's MAC address */
2304 aad[1] = mgmt->da;
2305 aad_len[1] = ETH_ALEN;
2306 /* The AP's nonce */
2307 aad[2] = sm->ANonce;
2308 aad_len[2] = FILS_NONCE_LEN;
2309 /* The STA's nonce */
2310 aad[3] = sm->SNonce;
2311 aad_len[3] = FILS_NONCE_LEN;
2312 /*
2313 * The (Re)Association Response frame from the Capability Information
2314 * field (the same offset in both Association and Reassociation
2315 * Response frames) to the FILS Session element (both inclusive).
2316 */
2317 aad[4] = (const u8 *) &mgmt->u.assoc_resp.capab_info;
2318 aad_len[4] = pos - aad[4];
2319
2320 /* The following elements will be encrypted with AES-SIV */
2321
2322 plain = wpabuf_alloc(1000);
2323 if (!plain)
2324 return -1;
2325
2326 /* TODO: FILS Public Key */
2327
2328 /* FILS Key Confirmation */
2329 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2330 wpabuf_put_u8(plain, 1 + sm->fils_key_auth_len); /* Length */
2331 /* Element ID Extension */
2332 wpabuf_put_u8(plain, WLAN_EID_EXT_FILS_KEY_CONFIRM);
2333 wpabuf_put_data(plain, sm->fils_key_auth_ap, sm->fils_key_auth_len);
2334
2335 /* TODO: FILS HLP Container */
2336
2337 /* TODO: FILS IP Address Assignment */
2338
2339 /* Key Delivery */
2340 gsm = sm->group;
2341 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2342 len = wpabuf_put(plain, 1);
2343 wpabuf_put_u8(plain, WLAN_EID_EXT_KEY_DELIVERY);
2344 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN,
2345 wpabuf_put(plain, WPA_KEY_RSC_LEN));
2346 /* GTK KDE */
2347 gtk = gsm->GTK[gsm->GN - 1];
2348 gtk_len = gsm->GTK_len;
2349 if (sm->wpa_auth->conf.disable_gtk) {
2350 /*
2351 * Provide unique random GTK to each STA to prevent use
2352 * of GTK in the BSS.
2353 */
2354 if (random_get_bytes(dummy_gtk, gtk_len) < 0) {
2355 wpabuf_free(plain);
2356 return -1;
2357 }
2358 gtk = dummy_gtk;
2359 }
2360 hdr[0] = gsm->GN & 0x03;
2361 hdr[1] = 0;
2362 tmp = wpabuf_put(plain, 0);
2363 tmp2 = wpa_add_kde(tmp, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2364 gtk, gtk_len);
2365 wpabuf_put(plain, tmp2 - tmp);
2366
2367 /* IGTK KDE */
2368 tmp = wpabuf_put(plain, 0);
2369 tmp2 = ieee80211w_kde_add(sm, tmp);
2370 wpabuf_put(plain, tmp2 - tmp);
2371
2372 *len = (u8 *) wpabuf_put(plain, 0) - len - 1;
2373
2374 if (pos + wpabuf_len(plain) + AES_BLOCK_SIZE > end) {
2375 wpa_printf(MSG_DEBUG,
2376 "FILS: Not enough room for FILS elements");
2377 wpabuf_free(plain);
2378 return -1;
2379 }
2380
2381 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: Association Response plaintext",
2382 plain);
2383
2384 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len,
2385 wpabuf_head(plain), wpabuf_len(plain),
2386 5, aad, aad_len, pos) < 0) {
2387 wpabuf_free(plain);
2388 return -1;
2389 }
2390
2391 wpa_hexdump(MSG_DEBUG,
2392 "FILS: Encrypted Association Response elements",
2393 pos, AES_BLOCK_SIZE + wpabuf_len(plain));
2394 current_len += wpabuf_len(plain) + AES_BLOCK_SIZE;
2395 wpabuf_free(plain);
2396
2397 sm->fils_completed = 1;
2398
2399 return current_len;
2400 }
2401
2402
2403 int fils_set_tk(struct wpa_state_machine *sm)
2404 {
2405 enum wpa_alg alg;
2406 int klen;
2407
2408 if (!sm || !sm->PTK_valid)
2409 return -1;
2410
2411 alg = wpa_cipher_to_alg(sm->pairwise);
2412 klen = wpa_cipher_key_len(sm->pairwise);
2413
2414 wpa_printf(MSG_DEBUG, "FILS: Configure TK to the driver");
2415 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2416 sm->PTK.tk, klen)) {
2417 wpa_printf(MSG_DEBUG, "FILS: Failed to set TK to the driver");
2418 return -1;
2419 }
2420
2421 return 0;
2422 }
2423
2424 #endif /* CONFIG_FILS */
2425
2426
2427 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2428 {
2429 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2430 struct wpa_ptk PTK;
2431 int ok = 0, psk_found = 0;
2432 const u8 *pmk = NULL;
2433 unsigned int pmk_len;
2434 int ft;
2435 const u8 *eapol_key_ie, *key_data, *mic;
2436 u16 key_data_length;
2437 size_t mic_len, eapol_key_ie_len;
2438 struct ieee802_1x_hdr *hdr;
2439 struct wpa_eapol_key *key;
2440 struct wpa_eapol_ie_parse kde;
2441
2442 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2443 sm->EAPOLKeyReceived = FALSE;
2444 sm->update_snonce = FALSE;
2445 os_memset(&PTK, 0, sizeof(PTK));
2446
2447 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
2448
2449 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2450 * WPA-PSK: iterate through possible PSKs and select the one matching
2451 * the packet */
2452 for (;;) {
2453 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2454 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2455 sm->p2p_dev_addr, pmk);
2456 if (pmk == NULL)
2457 break;
2458 psk_found = 1;
2459 pmk_len = PMK_LEN;
2460 } else {
2461 pmk = sm->PMK;
2462 pmk_len = sm->pmk_len;
2463 }
2464
2465 wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK);
2466
2467 if (mic_len &&
2468 wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
2469 sm->last_rx_eapol_key,
2470 sm->last_rx_eapol_key_len) == 0) {
2471 ok = 1;
2472 break;
2473 }
2474
2475 #ifdef CONFIG_FILS
2476 if (!mic_len &&
2477 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2478 sm->last_rx_eapol_key_len, NULL) == 0) {
2479 ok = 1;
2480 break;
2481 }
2482 #endif /* CONFIG_FILS */
2483
2484 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
2485 break;
2486 }
2487
2488 if (!ok) {
2489 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2490 "invalid MIC in msg 2/4 of 4-Way Handshake");
2491 if (psk_found)
2492 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2493 return;
2494 }
2495
2496 /*
2497 * Note: last_rx_eapol_key length fields have already been validated in
2498 * wpa_receive().
2499 */
2500 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2501 key = (struct wpa_eapol_key *) (hdr + 1);
2502 mic = (u8 *) (key + 1);
2503 key_data = mic + mic_len + 2;
2504 key_data_length = WPA_GET_BE16(mic + mic_len);
2505 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2506 sizeof(*key) - mic_len - 2)
2507 return;
2508
2509 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2510 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2511 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2512 return;
2513 }
2514 if (kde.rsn_ie) {
2515 eapol_key_ie = kde.rsn_ie;
2516 eapol_key_ie_len = kde.rsn_ie_len;
2517 } else if (kde.osen) {
2518 eapol_key_ie = kde.osen;
2519 eapol_key_ie_len = kde.osen_len;
2520 } else {
2521 eapol_key_ie = kde.wpa_ie;
2522 eapol_key_ie_len = kde.wpa_ie_len;
2523 }
2524 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2525 if (sm->wpa_ie == NULL ||
2526 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2527 eapol_key_ie, eapol_key_ie_len)) {
2528 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2529 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2530 if (sm->wpa_ie) {
2531 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2532 sm->wpa_ie, sm->wpa_ie_len);
2533 }
2534 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2535 eapol_key_ie, eapol_key_ie_len);
2536 /* MLME-DEAUTHENTICATE.request */
2537 wpa_sta_disconnect(wpa_auth, sm->addr);
2538 return;
2539 }
2540 #ifdef CONFIG_IEEE80211R
2541 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2542 wpa_sta_disconnect(wpa_auth, sm->addr);
2543 return;
2544 }
2545 #endif /* CONFIG_IEEE80211R */
2546 #ifdef CONFIG_P2P
2547 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2548 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2549 int idx;
2550 wpa_printf(MSG_DEBUG,
2551 "P2P: IP address requested in EAPOL-Key exchange");
2552 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2553 if (idx >= 0) {
2554 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2555 bitfield_set(wpa_auth->ip_pool, idx);
2556 WPA_PUT_BE32(sm->ip_addr, start + idx);
2557 wpa_printf(MSG_DEBUG,
2558 "P2P: Assigned IP address %u.%u.%u.%u to "
2559 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2560 sm->ip_addr[2], sm->ip_addr[3],
2561 MAC2STR(sm->addr));
2562 }
2563 }
2564 #endif /* CONFIG_P2P */
2565
2566 #ifdef CONFIG_IEEE80211R
2567 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2568 /*
2569 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2570 * with the value we derived.
2571 */
2572 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2573 WPA_PMK_NAME_LEN) != 0) {
2574 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2575 "PMKR1Name mismatch in FT 4-way "
2576 "handshake");
2577 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2578 "Supplicant",
2579 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2580 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2581 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2582 return;
2583 }
2584 }
2585 #endif /* CONFIG_IEEE80211R */
2586
2587 sm->pending_1_of_4_timeout = 0;
2588 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2589
2590 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2591 /* PSK may have changed from the previous choice, so update
2592 * state machine data based on whatever PSK was selected here.
2593 */
2594 os_memcpy(sm->PMK, pmk, PMK_LEN);
2595 sm->pmk_len = PMK_LEN;
2596 }
2597
2598 sm->MICVerified = TRUE;
2599
2600 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2601 sm->PTK_valid = TRUE;
2602 }
2603
2604
2605 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2606 {
2607 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2608 sm->TimeoutCtr = 0;
2609 }
2610
2611
2612 #ifdef CONFIG_IEEE80211W
2613
2614 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2615 {
2616 if (sm->mgmt_frame_prot) {
2617 size_t len;
2618 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2619 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2620 }
2621
2622 return 0;
2623 }
2624
2625
2626 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2627 {
2628 struct wpa_igtk_kde igtk;
2629 struct wpa_group *gsm = sm->group;
2630 u8 rsc[WPA_KEY_RSC_LEN];
2631 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2632
2633 if (!sm->mgmt_frame_prot)
2634 return pos;
2635
2636 igtk.keyid[0] = gsm->GN_igtk;
2637 igtk.keyid[1] = 0;
2638 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
2639 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
2640 os_memset(igtk.pn, 0, sizeof(igtk.pn));
2641 else
2642 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
2643 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
2644 if (sm->wpa_auth->conf.disable_gtk) {
2645 /*
2646 * Provide unique random IGTK to each STA to prevent use of
2647 * IGTK in the BSS.
2648 */
2649 if (random_get_bytes(igtk.igtk, len) < 0)
2650 return pos;
2651 }
2652 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
2653 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
2654 NULL, 0);
2655
2656 return pos;
2657 }
2658
2659 #else /* CONFIG_IEEE80211W */
2660
2661 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2662 {
2663 return 0;
2664 }
2665
2666
2667 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2668 {
2669 return pos;
2670 }
2671
2672 #endif /* CONFIG_IEEE80211W */
2673
2674
2675 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
2676 {
2677 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
2678 size_t gtk_len, kde_len;
2679 struct wpa_group *gsm = sm->group;
2680 u8 *wpa_ie;
2681 int wpa_ie_len, secure, keyidx, encr = 0;
2682
2683 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
2684 sm->TimeoutEvt = FALSE;
2685
2686 sm->TimeoutCtr++;
2687 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
2688 /* No point in sending the EAPOL-Key - we will disconnect
2689 * immediately following this. */
2690 return;
2691 }
2692
2693 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2694 GTK[GN], IGTK, [FTIE], [TIE * 2])
2695 */
2696 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2697 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2698 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2699 wpa_ie = sm->wpa_auth->wpa_ie;
2700 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2701 if (sm->wpa == WPA_VERSION_WPA &&
2702 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2703 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2704 /* WPA-only STA, remove RSN IE and possible MDIE */
2705 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2706 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
2707 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2708 wpa_ie_len = wpa_ie[1] + 2;
2709 }
2710 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2711 "sending 3/4 msg of 4-Way Handshake");
2712 if (sm->wpa == WPA_VERSION_WPA2) {
2713 /* WPA2 send GTK in the 4-way handshake */
2714 secure = 1;
2715 gtk = gsm->GTK[gsm->GN - 1];
2716 gtk_len = gsm->GTK_len;
2717 if (sm->wpa_auth->conf.disable_gtk) {
2718 /*
2719 * Provide unique random GTK to each STA to prevent use
2720 * of GTK in the BSS.
2721 */
2722 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2723 return;
2724 gtk = dummy_gtk;
2725 }
2726 keyidx = gsm->GN;
2727 _rsc = rsc;
2728 encr = 1;
2729 } else {
2730 /* WPA does not include GTK in msg 3/4 */
2731 secure = 0;
2732 gtk = NULL;
2733 gtk_len = 0;
2734 keyidx = 0;
2735 _rsc = NULL;
2736 if (sm->rx_eapol_key_secure) {
2737 /*
2738 * It looks like Windows 7 supplicant tries to use
2739 * Secure bit in msg 2/4 after having reported Michael
2740 * MIC failure and it then rejects the 4-way handshake
2741 * if msg 3/4 does not set Secure bit. Work around this
2742 * by setting the Secure bit here even in the case of
2743 * WPA if the supplicant used it first.
2744 */
2745 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2746 "STA used Secure bit in WPA msg 2/4 - "
2747 "set Secure for 3/4 as workaround");
2748 secure = 1;
2749 }
2750 }
2751
2752 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2753 if (gtk)
2754 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2755 #ifdef CONFIG_IEEE80211R
2756 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2757 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2758 kde_len += 300; /* FTIE + 2 * TIE */
2759 }
2760 #endif /* CONFIG_IEEE80211R */
2761 #ifdef CONFIG_P2P
2762 if (WPA_GET_BE32(sm->ip_addr) > 0)
2763 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2764 #endif /* CONFIG_P2P */
2765 kde = os_malloc(kde_len);
2766 if (kde == NULL)
2767 return;
2768
2769 pos = kde;
2770 os_memcpy(pos, wpa_ie, wpa_ie_len);
2771 pos += wpa_ie_len;
2772 #ifdef CONFIG_IEEE80211R
2773 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2774 int res;
2775 size_t elen;
2776
2777 elen = pos - kde;
2778 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
2779 if (res < 0) {
2780 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2781 "PMKR1Name into RSN IE in EAPOL-Key data");
2782 os_free(kde);
2783 return;
2784 }
2785 pos -= wpa_ie_len;
2786 pos += elen;
2787 }
2788 #endif /* CONFIG_IEEE80211R */
2789 if (gtk) {
2790 u8 hdr[2];
2791 hdr[0] = keyidx & 0x03;
2792 hdr[1] = 0;
2793 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2794 gtk, gtk_len);
2795 }
2796 pos = ieee80211w_kde_add(sm, pos);
2797
2798 #ifdef CONFIG_IEEE80211R
2799 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2800 int res;
2801 struct wpa_auth_config *conf;
2802
2803 conf = &sm->wpa_auth->conf;
2804 if (sm->assoc_resp_ftie &&
2805 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
2806 os_memcpy(pos, sm->assoc_resp_ftie,
2807 2 + sm->assoc_resp_ftie[1]);
2808 res = 2 + sm->assoc_resp_ftie[1];
2809 } else {
2810 res = wpa_write_ftie(conf, conf->r0_key_holder,
2811 conf->r0_key_holder_len,
2812 NULL, NULL, pos,
2813 kde + kde_len - pos,
2814 NULL, 0);
2815 }
2816 if (res < 0) {
2817 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2818 "into EAPOL-Key Key Data");
2819 os_free(kde);
2820 return;
2821 }
2822 pos += res;
2823
2824 /* TIE[ReassociationDeadline] (TU) */
2825 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2826 *pos++ = 5;
2827 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2828 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2829 pos += 4;
2830
2831 /* TIE[KeyLifetime] (seconds) */
2832 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2833 *pos++ = 5;
2834 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2835 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2836 pos += 4;
2837 }
2838 #endif /* CONFIG_IEEE80211R */
2839 #ifdef CONFIG_P2P
2840 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2841 u8 addr[3 * 4];
2842 os_memcpy(addr, sm->ip_addr, 4);
2843 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2844 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2845 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2846 addr, sizeof(addr), NULL, 0);
2847 }
2848 #endif /* CONFIG_P2P */
2849
2850 wpa_send_eapol(sm->wpa_auth, sm,
2851 (secure ? WPA_KEY_INFO_SECURE : 0) |
2852 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
2853 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2854 WPA_KEY_INFO_KEY_TYPE,
2855 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2856 os_free(kde);
2857 }
2858
2859
2860 SM_STATE(WPA_PTK, PTKINITDONE)
2861 {
2862 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2863 sm->EAPOLKeyReceived = FALSE;
2864 if (sm->Pair) {
2865 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2866 int klen = wpa_cipher_key_len(sm->pairwise);
2867 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2868 sm->PTK.tk, klen)) {
2869 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2870 return;
2871 }
2872 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2873 sm->pairwise_set = TRUE;
2874
2875 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2876 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2877 eloop_register_timeout(sm->wpa_auth->conf.
2878 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2879 sm->wpa_auth, sm);
2880 }
2881
2882 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2883 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2884 WPA_EAPOL_authorized, 1);
2885 }
2886 }
2887
2888 if (0 /* IBSS == TRUE */) {
2889 sm->keycount++;
2890 if (sm->keycount == 2) {
2891 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2892 WPA_EAPOL_portValid, 1);
2893 }
2894 } else {
2895 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2896 1);
2897 }
2898 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2899 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2900 if (sm->wpa == WPA_VERSION_WPA)
2901 sm->PInitAKeys = TRUE;
2902 else
2903 sm->has_GTK = TRUE;
2904 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2905 "pairwise key handshake completed (%s)",
2906 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2907
2908 #ifdef CONFIG_IEEE80211R
2909 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2910 #endif /* CONFIG_IEEE80211R */
2911 }
2912
2913
2914 SM_STEP(WPA_PTK)
2915 {
2916 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2917
2918 if (sm->Init)
2919 SM_ENTER(WPA_PTK, INITIALIZE);
2920 else if (sm->Disconnect
2921 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2922 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2923 "WPA_PTK: sm->Disconnect");
2924 SM_ENTER(WPA_PTK, DISCONNECT);
2925 }
2926 else if (sm->DeauthenticationRequest)
2927 SM_ENTER(WPA_PTK, DISCONNECTED);
2928 else if (sm->AuthenticationRequest)
2929 SM_ENTER(WPA_PTK, AUTHENTICATION);
2930 else if (sm->ReAuthenticationRequest)
2931 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2932 else if (sm->PTKRequest)
2933 SM_ENTER(WPA_PTK, PTKSTART);
2934 else switch (sm->wpa_ptk_state) {
2935 case WPA_PTK_INITIALIZE:
2936 break;
2937 case WPA_PTK_DISCONNECT:
2938 SM_ENTER(WPA_PTK, DISCONNECTED);
2939 break;
2940 case WPA_PTK_DISCONNECTED:
2941 SM_ENTER(WPA_PTK, INITIALIZE);
2942 break;
2943 case WPA_PTK_AUTHENTICATION:
2944 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2945 break;
2946 case WPA_PTK_AUTHENTICATION2:
2947 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2948 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2949 WPA_EAPOL_keyRun) > 0)
2950 SM_ENTER(WPA_PTK, INITPMK);
2951 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2952 /* FIX: && 802.1X::keyRun */)
2953 SM_ENTER(WPA_PTK, INITPSK);
2954 break;
2955 case WPA_PTK_INITPMK:
2956 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2957 WPA_EAPOL_keyAvailable) > 0)
2958 SM_ENTER(WPA_PTK, PTKSTART);
2959 else {
2960 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2961 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2962 "INITPMK - keyAvailable = false");
2963 SM_ENTER(WPA_PTK, DISCONNECT);
2964 }
2965 break;
2966 case WPA_PTK_INITPSK:
2967 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2968 NULL))
2969 SM_ENTER(WPA_PTK, PTKSTART);
2970 else {
2971 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2972 "no PSK configured for the STA");
2973 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2974 SM_ENTER(WPA_PTK, DISCONNECT);
2975 }
2976 break;
2977 case WPA_PTK_PTKSTART:
2978 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2979 sm->EAPOLKeyPairwise)
2980 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2981 else if (sm->TimeoutCtr >
2982 (int) dot11RSNAConfigPairwiseUpdateCount) {
2983 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2984 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2985 "PTKSTART: Retry limit %d reached",
2986 dot11RSNAConfigPairwiseUpdateCount);
2987 SM_ENTER(WPA_PTK, DISCONNECT);
2988 } else if (sm->TimeoutEvt)
2989 SM_ENTER(WPA_PTK, PTKSTART);
2990 break;
2991 case WPA_PTK_PTKCALCNEGOTIATING:
2992 if (sm->MICVerified)
2993 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2994 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2995 sm->EAPOLKeyPairwise)
2996 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2997 else if (sm->TimeoutEvt)
2998 SM_ENTER(WPA_PTK, PTKSTART);
2999 break;
3000 case WPA_PTK_PTKCALCNEGOTIATING2:
3001 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3002 break;
3003 case WPA_PTK_PTKINITNEGOTIATING:
3004 if (sm->update_snonce)
3005 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3006 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3007 sm->EAPOLKeyPairwise && sm->MICVerified)
3008 SM_ENTER(WPA_PTK, PTKINITDONE);
3009 else if (sm->TimeoutCtr >
3010 (int) dot11RSNAConfigPairwiseUpdateCount) {
3011 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3012 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3013 "PTKINITNEGOTIATING: Retry limit %d "
3014 "reached",
3015 dot11RSNAConfigPairwiseUpdateCount);
3016 SM_ENTER(WPA_PTK, DISCONNECT);
3017 } else if (sm->TimeoutEvt)
3018 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3019 break;
3020 case WPA_PTK_PTKINITDONE:
3021 break;
3022 }
3023 }
3024
3025
3026 SM_STATE(WPA_PTK_GROUP, IDLE)
3027 {
3028 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
3029 if (sm->Init) {
3030 /* Init flag is not cleared here, so avoid busy
3031 * loop by claiming nothing changed. */
3032 sm->changed = FALSE;
3033 }
3034 sm->GTimeoutCtr = 0;
3035 }
3036
3037
3038 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
3039 {
3040 u8 rsc[WPA_KEY_RSC_LEN];
3041 struct wpa_group *gsm = sm->group;
3042 const u8 *kde;
3043 u8 *kde_buf = NULL, *pos, hdr[2];
3044 size_t kde_len;
3045 u8 *gtk, dummy_gtk[32];
3046
3047 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
3048
3049 sm->GTimeoutCtr++;
3050 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
3051 /* No point in sending the EAPOL-Key - we will disconnect
3052 * immediately following this. */
3053 return;
3054 }
3055
3056 if (sm->wpa == WPA_VERSION_WPA)
3057 sm->PInitAKeys = FALSE;
3058 sm->TimeoutEvt = FALSE;
3059 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
3060 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3061 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
3062 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3063 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3064 "sending 1/2 msg of Group Key Handshake");
3065
3066 gtk = gsm->GTK[gsm->GN - 1];
3067 if (sm->wpa_auth->conf.disable_gtk) {
3068 /*
3069 * Provide unique random GTK to each STA to prevent use
3070 * of GTK in the BSS.
3071 */
3072 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
3073 return;
3074 gtk = dummy_gtk;
3075 }
3076 if (sm->wpa == WPA_VERSION_WPA2) {
3077 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
3078 ieee80211w_kde_len(sm);
3079 kde_buf = os_malloc(kde_len);
3080 if (kde_buf == NULL)
3081 return;
3082
3083 kde = pos = kde_buf;
3084 hdr[0] = gsm->GN & 0x03;
3085 hdr[1] = 0;
3086 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3087 gtk, gsm->GTK_len);
3088 pos = ieee80211w_kde_add(sm, pos);
3089 kde_len = pos - kde;
3090 } else {
3091 kde = gtk;
3092 kde_len = gsm->GTK_len;
3093 }
3094
3095 wpa_send_eapol(sm->wpa_auth, sm,
3096 WPA_KEY_INFO_SECURE |
3097 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
3098 WPA_KEY_INFO_ACK |
3099 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
3100 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1);
3101
3102 os_free(kde_buf);
3103 }
3104
3105
3106 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
3107 {
3108 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
3109 sm->EAPOLKeyReceived = FALSE;
3110 if (sm->GUpdateStationKeys)
3111 sm->group->GKeyDoneStations--;
3112 sm->GUpdateStationKeys = FALSE;
3113 sm->GTimeoutCtr = 0;
3114 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
3115 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3116 "group key handshake completed (%s)",
3117 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3118 sm->has_GTK = TRUE;
3119 }
3120
3121
3122 SM_STATE(WPA_PTK_GROUP, KEYERROR)
3123 {
3124 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
3125 if (sm->GUpdateStationKeys)
3126 sm->group->GKeyDoneStations--;
3127 sm->GUpdateStationKeys = FALSE;
3128 sm->Disconnect = TRUE;
3129 }
3130
3131
3132 SM_STEP(WPA_PTK_GROUP)
3133 {
3134 if (sm->Init || sm->PtkGroupInit) {
3135 SM_ENTER(WPA_PTK_GROUP, IDLE);
3136 sm->PtkGroupInit = FALSE;
3137 } else switch (sm->wpa_ptk_group_state) {
3138 case WPA_PTK_GROUP_IDLE:
3139 if (sm->GUpdateStationKeys ||
3140 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
3141 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3142 break;
3143 case WPA_PTK_GROUP_REKEYNEGOTIATING:
3144 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3145 !sm->EAPOLKeyPairwise && sm->MICVerified)
3146 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
3147 else if (sm->GTimeoutCtr >
3148 (int) dot11RSNAConfigGroupUpdateCount)
3149 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
3150 else if (sm->TimeoutEvt)
3151 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3152 break;
3153 case WPA_PTK_GROUP_KEYERROR:
3154 SM_ENTER(WPA_PTK_GROUP, IDLE);
3155 break;
3156 case WPA_PTK_GROUP_REKEYESTABLISHED:
3157 SM_ENTER(WPA_PTK_GROUP, IDLE);
3158 break;
3159 }
3160 }
3161
3162
3163 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
3164 struct wpa_group *group)
3165 {
3166 int ret = 0;
3167
3168 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3169 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3170 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
3171 wpa_auth->addr, group->GNonce,
3172 group->GTK[group->GN - 1], group->GTK_len) < 0)
3173 ret = -1;
3174 wpa_hexdump_key(MSG_DEBUG, "GTK",
3175 group->GTK[group->GN - 1], group->GTK_len);
3176
3177 #ifdef CONFIG_IEEE80211W
3178 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3179 size_t len;
3180 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3181 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3182 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3183 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
3184 wpa_auth->addr, group->GNonce,
3185 group->IGTK[group->GN_igtk - 4], len) < 0)
3186 ret = -1;
3187 wpa_hexdump_key(MSG_DEBUG, "IGTK",
3188 group->IGTK[group->GN_igtk - 4], len);
3189 }
3190 #endif /* CONFIG_IEEE80211W */
3191
3192 return ret;
3193 }
3194
3195
3196 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
3197 struct wpa_group *group)
3198 {
3199 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3200 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
3201 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
3202 group->wpa_group_state = WPA_GROUP_GTK_INIT;
3203
3204 /* GTK[0..N] = 0 */
3205 os_memset(group->GTK, 0, sizeof(group->GTK));
3206 group->GN = 1;
3207 group->GM = 2;
3208 #ifdef CONFIG_IEEE80211W
3209 group->GN_igtk = 4;
3210 group->GM_igtk = 5;
3211 #endif /* CONFIG_IEEE80211W */
3212 /* GTK[GN] = CalcGTK() */
3213 wpa_gtk_update(wpa_auth, group);
3214 }
3215
3216
3217 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
3218 {
3219 if (ctx != NULL && ctx != sm->group)
3220 return 0;
3221
3222 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
3223 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3224 "Not in PTKINITDONE; skip Group Key update");
3225 sm->GUpdateStationKeys = FALSE;
3226 return 0;
3227 }
3228 if (sm->GUpdateStationKeys) {
3229 /*
3230 * This should not really happen, so add a debug log entry.
3231 * Since we clear the GKeyDoneStations before the loop, the
3232 * station needs to be counted here anyway.
3233 */
3234 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3235 "GUpdateStationKeys was already set when "
3236 "marking station for GTK rekeying");
3237 }
3238
3239 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
3240 if (sm->is_wnmsleep)
3241 return 0;
3242
3243 sm->group->GKeyDoneStations++;
3244 sm->GUpdateStationKeys = TRUE;
3245
3246 wpa_sm_step(sm);
3247 return 0;
3248 }
3249
3250
3251 #ifdef CONFIG_WNM
3252 /* update GTK when exiting WNM-Sleep Mode */
3253 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
3254 {
3255 if (sm == NULL || sm->is_wnmsleep)
3256 return;
3257
3258 wpa_group_update_sta(sm, NULL);
3259 }
3260
3261
3262 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
3263 {
3264 if (sm)
3265 sm->is_wnmsleep = !!flag;
3266 }
3267
3268
3269 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3270 {
3271 struct wpa_group *gsm = sm->group;
3272 u8 *start = pos;
3273
3274 /*
3275 * GTK subelement:
3276 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
3277 * Key[5..32]
3278 */
3279 *pos++ = WNM_SLEEP_SUBELEM_GTK;
3280 *pos++ = 11 + gsm->GTK_len;
3281 /* Key ID in B0-B1 of Key Info */
3282 WPA_PUT_LE16(pos, gsm->GN & 0x03);
3283 pos += 2;
3284 *pos++ = gsm->GTK_len;
3285 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
3286 return 0;
3287 pos += 8;
3288 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3289 pos += gsm->GTK_len;
3290
3291 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
3292 gsm->GN);
3293 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
3294 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3295
3296 return pos - start;
3297 }
3298
3299
3300 #ifdef CONFIG_IEEE80211W
3301 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3302 {
3303 struct wpa_group *gsm = sm->group;
3304 u8 *start = pos;
3305 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3306
3307 /*
3308 * IGTK subelement:
3309 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
3310 */
3311 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
3312 *pos++ = 2 + 6 + len;
3313 WPA_PUT_LE16(pos, gsm->GN_igtk);
3314 pos += 2;
3315 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
3316 return 0;
3317 pos += 6;
3318
3319 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
3320 pos += len;
3321
3322 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
3323 gsm->GN_igtk);
3324 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
3325 gsm->IGTK[gsm->GN_igtk - 4], len);
3326
3327 return pos - start;
3328 }
3329 #endif /* CONFIG_IEEE80211W */
3330 #endif /* CONFIG_WNM */
3331
3332
3333 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3334 struct wpa_group *group)
3335 {
3336 int tmp;
3337
3338 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3339 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3340 group->changed = TRUE;
3341 group->wpa_group_state = WPA_GROUP_SETKEYS;
3342 group->GTKReKey = FALSE;
3343 tmp = group->GM;
3344 group->GM = group->GN;
3345 group->GN = tmp;
3346 #ifdef CONFIG_IEEE80211W
3347 tmp = group->GM_igtk;
3348 group->GM_igtk = group->GN_igtk;
3349 group->GN_igtk = tmp;
3350 #endif /* CONFIG_IEEE80211W */
3351 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3352 * counting the STAs that are marked with GUpdateStationKeys instead of
3353 * including all STAs that could be in not-yet-completed state. */
3354 wpa_gtk_update(wpa_auth, group);
3355
3356 if (group->GKeyDoneStations) {
3357 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3358 "GKeyDoneStations=%d when starting new GTK rekey",
3359 group->GKeyDoneStations);
3360 group->GKeyDoneStations = 0;
3361 }
3362 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3363 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3364 group->GKeyDoneStations);
3365 }
3366
3367
3368 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3369 struct wpa_group *group)
3370 {
3371 int ret = 0;
3372
3373 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3374 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3375 broadcast_ether_addr, group->GN,
3376 group->GTK[group->GN - 1], group->GTK_len) < 0)
3377 ret = -1;
3378
3379 #ifdef CONFIG_IEEE80211W
3380 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3381 enum wpa_alg alg;
3382 size_t len;
3383
3384 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3385 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3386
3387 if (ret == 0 &&
3388 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3389 broadcast_ether_addr, group->GN_igtk,
3390 group->IGTK[group->GN_igtk - 4], len) < 0)
3391 ret = -1;
3392 }
3393 #endif /* CONFIG_IEEE80211W */
3394
3395 return ret;
3396 }
3397
3398
3399 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3400 {
3401 if (sm->group == ctx) {
3402 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3403 " for discconnection due to fatal failure",
3404 MAC2STR(sm->addr));
3405 sm->Disconnect = TRUE;
3406 }
3407
3408 return 0;
3409 }
3410
3411
3412 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3413 struct wpa_group *group)
3414 {
3415 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3416 group->changed = TRUE;
3417 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3418 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3419 }
3420
3421
3422 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3423 struct wpa_group *group)
3424 {
3425 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3426 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3427 group->changed = TRUE;
3428 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
3429
3430 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
3431 wpa_group_fatal_failure(wpa_auth, group);
3432 return -1;
3433 }
3434
3435 return 0;
3436 }
3437
3438
3439 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
3440 struct wpa_group *group)
3441 {
3442 if (group->GInit) {
3443 wpa_group_gtk_init(wpa_auth, group);
3444 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
3445 /* Do not allow group operations */
3446 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
3447 group->GTKAuthenticator) {
3448 wpa_group_setkeysdone(wpa_auth, group);
3449 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
3450 group->GTKReKey) {
3451 wpa_group_setkeys(wpa_auth, group);
3452 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
3453 if (group->GKeyDoneStations == 0)
3454 wpa_group_setkeysdone(wpa_auth, group);
3455 else if (group->GTKReKey)
3456 wpa_group_setkeys(wpa_auth, group);
3457 }
3458 }
3459
3460
3461 static int wpa_sm_step(struct wpa_state_machine *sm)
3462 {
3463 if (sm == NULL)
3464 return 0;
3465
3466 if (sm->in_step_loop) {
3467 /* This should not happen, but if it does, make sure we do not
3468 * end up freeing the state machine too early by exiting the
3469 * recursive call. */
3470 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
3471 return 0;
3472 }
3473
3474 sm->in_step_loop = 1;
3475 do {
3476 if (sm->pending_deinit)
3477 break;
3478
3479 sm->changed = FALSE;
3480 sm->wpa_auth->group->changed = FALSE;
3481
3482 SM_STEP_RUN(WPA_PTK);
3483 if (sm->pending_deinit)
3484 break;
3485 SM_STEP_RUN(WPA_PTK_GROUP);
3486 if (sm->pending_deinit)
3487 break;
3488 wpa_group_sm_step(sm->wpa_auth, sm->group);
3489 } while (sm->changed || sm->wpa_auth->group->changed);
3490 sm->in_step_loop = 0;
3491
3492 if (sm->pending_deinit) {
3493 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
3494 "machine deinit for " MACSTR, MAC2STR(sm->addr));
3495 wpa_free_sta_sm(sm);
3496 return 1;
3497 }
3498 return 0;
3499 }
3500
3501
3502 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
3503 {
3504 struct wpa_state_machine *sm = eloop_ctx;
3505 wpa_sm_step(sm);
3506 }
3507
3508
3509 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
3510 {
3511 if (sm == NULL)
3512 return;
3513 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
3514 }
3515
3516
3517 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
3518 {
3519 int tmp, i;
3520 struct wpa_group *group;
3521
3522 if (wpa_auth == NULL)
3523 return;
3524
3525 group = wpa_auth->group;
3526
3527 for (i = 0; i < 2; i++) {
3528 tmp = group->GM;
3529 group->GM = group->GN;
3530 group->GN = tmp;
3531 #ifdef CONFIG_IEEE80211W
3532 tmp = group->GM_igtk;
3533 group->GM_igtk = group->GN_igtk;
3534 group->GN_igtk = tmp;
3535 #endif /* CONFIG_IEEE80211W */
3536 wpa_gtk_update(wpa_auth, group);
3537 wpa_group_config_group_keys(wpa_auth, group);
3538 }
3539 }
3540
3541
3542 static const char * wpa_bool_txt(int val)
3543 {
3544 return val ? "TRUE" : "FALSE";
3545 }
3546
3547
3548 #define RSN_SUITE "%02x-%02x-%02x-%d"
3549 #define RSN_SUITE_ARG(s) \
3550 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
3551
3552 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
3553 {
3554 int len = 0, ret;
3555 char pmkid_txt[PMKID_LEN * 2 + 1];
3556 #ifdef CONFIG_RSN_PREAUTH
3557 const int preauth = 1;
3558 #else /* CONFIG_RSN_PREAUTH */
3559 const int preauth = 0;
3560 #endif /* CONFIG_RSN_PREAUTH */
3561
3562 if (wpa_auth == NULL)
3563 return len;
3564
3565 ret = os_snprintf(buf + len, buflen - len,
3566 "dot11RSNAOptionImplemented=TRUE\n"
3567 "dot11RSNAPreauthenticationImplemented=%s\n"
3568 "dot11RSNAEnabled=%s\n"
3569 "dot11RSNAPreauthenticationEnabled=%s\n",
3570 wpa_bool_txt(preauth),
3571 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
3572 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
3573 if (os_snprintf_error(buflen - len, ret))
3574 return len;
3575 len += ret;
3576
3577 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
3578 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
3579
3580 ret = os_snprintf(
3581 buf + len, buflen - len,
3582 "dot11RSNAConfigVersion=%u\n"
3583 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
3584 /* FIX: dot11RSNAConfigGroupCipher */
3585 /* FIX: dot11RSNAConfigGroupRekeyMethod */
3586 /* FIX: dot11RSNAConfigGroupRekeyTime */
3587 /* FIX: dot11RSNAConfigGroupRekeyPackets */
3588 "dot11RSNAConfigGroupRekeyStrict=%u\n"
3589 "dot11RSNAConfigGroupUpdateCount=%u\n"
3590 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
3591 "dot11RSNAConfigGroupCipherSize=%u\n"
3592 "dot11RSNAConfigPMKLifetime=%u\n"
3593 "dot11RSNAConfigPMKReauthThreshold=%u\n"
3594 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
3595 "dot11RSNAConfigSATimeout=%u\n"
3596 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
3597 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
3598 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
3599 "dot11RSNAPMKIDUsed=%s\n"
3600 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
3601 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
3602 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
3603 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
3604 "dot11RSNA4WayHandshakeFailures=%u\n"
3605 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
3606 RSN_VERSION,
3607 !!wpa_auth->conf.wpa_strict_rekey,
3608 dot11RSNAConfigGroupUpdateCount,
3609 dot11RSNAConfigPairwiseUpdateCount,
3610 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
3611 dot11RSNAConfigPMKLifetime,
3612 dot11RSNAConfigPMKReauthThreshold,
3613 dot11RSNAConfigSATimeout,
3614 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
3615 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
3616 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
3617 pmkid_txt,
3618 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
3619 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
3620 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
3621 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
3622 wpa_auth->dot11RSNA4WayHandshakeFailures);
3623 if (os_snprintf_error(buflen - len, ret))
3624 return len;
3625 len += ret;
3626
3627 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
3628 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
3629
3630 /* Private MIB */
3631 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
3632 wpa_auth->group->wpa_group_state);
3633 if (os_snprintf_error(buflen - len, ret))
3634 return len;
3635 len += ret;
3636
3637 return len;
3638 }
3639
3640
3641 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
3642 {
3643 int len = 0, ret;
3644 u32 pairwise = 0;
3645
3646 if (sm == NULL)
3647 return 0;
3648
3649 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
3650
3651 /* dot11RSNAStatsEntry */
3652
3653 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
3654 WPA_PROTO_RSN : WPA_PROTO_WPA,
3655 sm->pairwise);
3656 if (pairwise == 0)
3657 return 0;
3658
3659 ret = os_snprintf(
3660 buf + len, buflen - len,
3661 /* TODO: dot11RSNAStatsIndex */
3662 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
3663 "dot11RSNAStatsVersion=1\n"
3664 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
3665 /* TODO: dot11RSNAStatsTKIPICVErrors */
3666 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
3667 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
3668 /* TODO: dot11RSNAStatsCCMPReplays */
3669 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
3670 /* TODO: dot11RSNAStatsTKIPReplays */,
3671 MAC2STR(sm->addr),
3672 RSN_SUITE_ARG(pairwise),
3673 sm->dot11RSNAStatsTKIPLocalMICFailures,
3674 sm->dot11RSNAStatsTKIPRemoteMICFailures);
3675 if (os_snprintf_error(buflen - len, ret))
3676 return len;
3677 len += ret;
3678
3679 /* Private MIB */
3680 ret = os_snprintf(buf + len, buflen - len,
3681 "hostapdWPAPTKState=%d\n"
3682 "hostapdWPAPTKGroupState=%d\n",
3683 sm->wpa_ptk_state,
3684 sm->wpa_ptk_group_state);
3685 if (os_snprintf_error(buflen - len, ret))
3686 return len;
3687 len += ret;
3688
3689 return len;
3690 }
3691
3692
3693 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
3694 {
3695 if (wpa_auth)
3696 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
3697 }
3698
3699
3700 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
3701 {
3702 return sm && sm->pairwise_set;
3703 }
3704
3705
3706 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
3707 {
3708 return sm->pairwise;
3709 }
3710
3711
3712 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3713 {
3714 if (sm == NULL)
3715 return -1;
3716 return sm->wpa_key_mgmt;
3717 }
3718
3719
3720 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3721 {
3722 if (sm == NULL)
3723 return 0;
3724 return sm->wpa;
3725 }
3726
3727
3728 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3729 struct rsn_pmksa_cache_entry *entry)
3730 {
3731 if (sm == NULL || sm->pmksa != entry)
3732 return -1;
3733 sm->pmksa = NULL;
3734 return 0;
3735 }
3736
3737
3738 struct rsn_pmksa_cache_entry *
3739 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3740 {
3741 return sm ? sm->pmksa : NULL;
3742 }
3743
3744
3745 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3746 {
3747 if (sm)
3748 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3749 }
3750
3751
3752 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3753 {
3754 if (wpa_auth == NULL)
3755 return NULL;
3756 *len = wpa_auth->wpa_ie_len;
3757 return wpa_auth->wpa_ie;
3758 }
3759
3760
3761 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3762 unsigned int pmk_len,
3763 int session_timeout, struct eapol_state_machine *eapol)
3764 {
3765 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3766 sm->wpa_auth->conf.disable_pmksa_caching)
3767 return -1;
3768
3769 if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
3770 if (pmk_len > PMK_LEN_SUITE_B_192)
3771 pmk_len = PMK_LEN_SUITE_B_192;
3772 } else if (pmk_len > PMK_LEN) {
3773 pmk_len = PMK_LEN;
3774 }
3775
3776 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
3777 sm->PTK.kck, sm->PTK.kck_len,
3778 sm->wpa_auth->addr, sm->addr, session_timeout,
3779 eapol, sm->wpa_key_mgmt))
3780 return 0;
3781
3782 return -1;
3783 }
3784
3785
3786 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3787 const u8 *pmk, size_t len, const u8 *sta_addr,
3788 int session_timeout,
3789 struct eapol_state_machine *eapol)
3790 {
3791 if (wpa_auth == NULL)
3792 return -1;
3793
3794 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
3795 NULL, 0,
3796 wpa_auth->addr,
3797 sta_addr, session_timeout, eapol,
3798 WPA_KEY_MGMT_IEEE8021X))
3799 return 0;
3800
3801 return -1;
3802 }
3803
3804
3805 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
3806 const u8 *pmk, const u8 *pmkid)
3807 {
3808 if (wpa_auth->conf.disable_pmksa_caching)
3809 return -1;
3810
3811 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
3812 NULL, 0,
3813 wpa_auth->addr, addr, 0, NULL,
3814 WPA_KEY_MGMT_SAE))
3815 return 0;
3816
3817 return -1;
3818 }
3819
3820
3821 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3822 const u8 *sta_addr)
3823 {
3824 struct rsn_pmksa_cache_entry *pmksa;
3825
3826 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3827 return;
3828 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3829 if (pmksa) {
3830 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3831 MACSTR " based on request", MAC2STR(sta_addr));
3832 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3833 }
3834 }
3835
3836
3837 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
3838 size_t len)
3839 {
3840 if (!wpa_auth || !wpa_auth->pmksa)
3841 return 0;
3842 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
3843 }
3844
3845
3846 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
3847 {
3848 if (wpa_auth && wpa_auth->pmksa)
3849 pmksa_cache_auth_flush(wpa_auth->pmksa);
3850 }
3851
3852
3853 struct rsn_pmksa_cache_entry *
3854 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
3855 const u8 *pmkid)
3856 {
3857 if (!wpa_auth || !wpa_auth->pmksa)
3858 return NULL;
3859 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, pmkid);
3860 }
3861
3862
3863 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
3864 struct wpa_state_machine *sm,
3865 struct wpa_authenticator *wpa_auth,
3866 u8 *pmkid, u8 *pmk)
3867 {
3868 if (!sm)
3869 return;
3870
3871 sm->pmksa = pmksa;
3872 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
3873 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
3874 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
3875 }
3876
3877
3878 /*
3879 * Remove and free the group from wpa_authenticator. This is triggered by a
3880 * callback to make sure nobody is currently iterating the group list while it
3881 * gets modified.
3882 */
3883 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
3884 struct wpa_group *group)
3885 {
3886 struct wpa_group *prev = wpa_auth->group;
3887
3888 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
3889 group->vlan_id);
3890
3891 while (prev) {
3892 if (prev->next == group) {
3893 /* This never frees the special first group as needed */
3894 prev->next = group->next;
3895 os_free(group);
3896 break;
3897 }
3898 prev = prev->next;
3899 }
3900
3901 }
3902
3903
3904 /* Increase the reference counter for group */
3905 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
3906 struct wpa_group *group)
3907 {
3908 /* Skip the special first group */
3909 if (wpa_auth->group == group)
3910 return;
3911
3912 group->references++;
3913 }
3914
3915
3916 /* Decrease the reference counter and maybe free the group */
3917 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
3918 struct wpa_group *group)
3919 {
3920 /* Skip the special first group */
3921 if (wpa_auth->group == group)
3922 return;
3923
3924 group->references--;
3925 if (group->references)
3926 return;
3927 wpa_group_free(wpa_auth, group);
3928 }
3929
3930
3931 /*
3932 * Add a group that has its references counter set to zero. Caller needs to
3933 * call wpa_group_get() on the return value to mark the entry in use.
3934 */
3935 static struct wpa_group *
3936 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3937 {
3938 struct wpa_group *group;
3939
3940 if (wpa_auth == NULL || wpa_auth->group == NULL)
3941 return NULL;
3942
3943 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3944 vlan_id);
3945 group = wpa_group_init(wpa_auth, vlan_id, 0);
3946 if (group == NULL)
3947 return NULL;
3948
3949 group->next = wpa_auth->group->next;
3950 wpa_auth->group->next = group;
3951
3952 return group;
3953 }
3954
3955
3956 /*
3957 * Enforce that the group state machine for the VLAN is running, increase
3958 * reference counter as interface is up. References might have been increased
3959 * even if a negative value is returned.
3960 * Returns: -1 on error (group missing, group already failed); otherwise, 0
3961 */
3962 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3963 {
3964 struct wpa_group *group;
3965
3966 if (wpa_auth == NULL)
3967 return 0;
3968
3969 group = wpa_auth->group;
3970 while (group) {
3971 if (group->vlan_id == vlan_id)
3972 break;
3973 group = group->next;
3974 }
3975
3976 if (group == NULL) {
3977 group = wpa_auth_add_group(wpa_auth, vlan_id);
3978 if (group == NULL)
3979 return -1;
3980 }
3981
3982 wpa_printf(MSG_DEBUG,
3983 "WPA: Ensure group state machine running for VLAN ID %d",
3984 vlan_id);
3985
3986 wpa_group_get(wpa_auth, group);
3987 group->num_setup_iface++;
3988
3989 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3990 return -1;
3991
3992 return 0;
3993 }
3994
3995
3996 /*
3997 * Decrease reference counter, expected to be zero afterwards.
3998 * returns: -1 on error (group not found, group in fail state)
3999 * -2 if wpa_group is still referenced
4000 * 0 else
4001 */
4002 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4003 {
4004 struct wpa_group *group;
4005 int ret = 0;
4006
4007 if (wpa_auth == NULL)
4008 return 0;
4009
4010 group = wpa_auth->group;
4011 while (group) {
4012 if (group->vlan_id == vlan_id)
4013 break;
4014 group = group->next;
4015 }
4016
4017 if (group == NULL)
4018 return -1;
4019
4020 wpa_printf(MSG_DEBUG,
4021 "WPA: Try stopping group state machine for VLAN ID %d",
4022 vlan_id);
4023
4024 if (group->num_setup_iface <= 0) {
4025 wpa_printf(MSG_ERROR,
4026 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
4027 vlan_id);
4028 return -1;
4029 }
4030 group->num_setup_iface--;
4031
4032 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4033 ret = -1;
4034
4035 if (group->references > 1) {
4036 wpa_printf(MSG_DEBUG,
4037 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
4038 vlan_id);
4039 ret = -2;
4040 }
4041
4042 wpa_group_put(wpa_auth, group);
4043
4044 return ret;
4045 }
4046
4047
4048 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
4049 {
4050 struct wpa_group *group;
4051
4052 if (sm == NULL || sm->wpa_auth == NULL)
4053 return 0;
4054
4055 group = sm->wpa_auth->group;
4056 while (group) {
4057 if (group->vlan_id == vlan_id)
4058 break;
4059 group = group->next;
4060 }
4061
4062 if (group == NULL) {
4063 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
4064 if (group == NULL)
4065 return -1;
4066 }
4067
4068 if (sm->group == group)
4069 return 0;
4070
4071 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4072 return -1;
4073
4074 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
4075 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
4076
4077 wpa_group_get(sm->wpa_auth, group);
4078 wpa_group_put(sm->wpa_auth, sm->group);
4079 sm->group = group;
4080
4081 return 0;
4082 }
4083
4084
4085 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
4086 struct wpa_state_machine *sm, int ack)
4087 {
4088 if (wpa_auth == NULL || sm == NULL)
4089 return;
4090 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
4091 " ack=%d", MAC2STR(sm->addr), ack);
4092 if (sm->pending_1_of_4_timeout && ack) {
4093 /*
4094 * Some deployed supplicant implementations update their SNonce
4095 * for each EAPOL-Key 2/4 message even within the same 4-way
4096 * handshake and then fail to use the first SNonce when
4097 * deriving the PTK. This results in unsuccessful 4-way
4098 * handshake whenever the relatively short initial timeout is
4099 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
4100 * around this by increasing the timeout now that we know that
4101 * the station has received the frame.
4102 */
4103 int timeout_ms = eapol_key_timeout_subseq;
4104 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
4105 "timeout by %u ms because of acknowledged frame",
4106 timeout_ms);
4107 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
4108 eloop_register_timeout(timeout_ms / 1000,
4109 (timeout_ms % 1000) * 1000,
4110 wpa_send_eapol_timeout, wpa_auth, sm);
4111 }
4112 }
4113
4114
4115 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
4116 {
4117 if (sm == NULL)
4118 return 0;
4119 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
4120 }
4121
4122
4123 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
4124 {
4125 if (sm == NULL)
4126 return 0;
4127 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
4128 }
4129
4130
4131 #ifdef CONFIG_P2P
4132 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
4133 {
4134 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
4135 return -1;
4136 os_memcpy(addr, sm->ip_addr, 4);
4137 return 0;
4138 }
4139 #endif /* CONFIG_P2P */
4140
4141
4142 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
4143 struct radius_das_attrs *attr)
4144 {
4145 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
4146 }
4147
4148
4149 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
4150 {
4151 struct wpa_group *group;
4152
4153 if (!wpa_auth)
4154 return;
4155 for (group = wpa_auth->group; group; group = group->next)
4156 wpa_group_config_group_keys(wpa_auth, group);
4157 }
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