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FILS: Update EAPOL-Key Descriptor Version RX rules (AP)
[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
62 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
63 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
64 static const u32 eapol_key_timeout_first = 100; /* ms */
65 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
66 static const u32 eapol_key_timeout_first_group = 500; /* ms */
67
68 /* TODO: make these configurable */
69 static const int dot11RSNAConfigPMKLifetime = 43200;
70 static const int dot11RSNAConfigPMKReauthThreshold = 70;
71 static const int dot11RSNAConfigSATimeout = 60;
72
73
74 static inline int wpa_auth_mic_failure_report(
75 struct wpa_authenticator *wpa_auth, const u8 *addr)
76 {
77 if (wpa_auth->cb.mic_failure_report)
78 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
79 return 0;
80 }
81
82
83 static inline void wpa_auth_psk_failure_report(
84 struct wpa_authenticator *wpa_auth, const u8 *addr)
85 {
86 if (wpa_auth->cb.psk_failure_report)
87 wpa_auth->cb.psk_failure_report(wpa_auth->cb.ctx, addr);
88 }
89
90
91 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
92 const u8 *addr, wpa_eapol_variable var,
93 int value)
94 {
95 if (wpa_auth->cb.set_eapol)
96 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
97 }
98
99
100 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
101 const u8 *addr, wpa_eapol_variable var)
102 {
103 if (wpa_auth->cb.get_eapol == NULL)
104 return -1;
105 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
106 }
107
108
109 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
110 const u8 *addr,
111 const u8 *p2p_dev_addr,
112 const u8 *prev_psk)
113 {
114 if (wpa_auth->cb.get_psk == NULL)
115 return NULL;
116 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
117 prev_psk);
118 }
119
120
121 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
122 const u8 *addr, u8 *msk, size_t *len)
123 {
124 if (wpa_auth->cb.get_msk == NULL)
125 return -1;
126 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
127 }
128
129
130 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
131 int vlan_id,
132 enum wpa_alg alg, const u8 *addr, int idx,
133 u8 *key, size_t key_len)
134 {
135 if (wpa_auth->cb.set_key == NULL)
136 return -1;
137 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
138 key, key_len);
139 }
140
141
142 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
143 const u8 *addr, int idx, u8 *seq)
144 {
145 if (wpa_auth->cb.get_seqnum == NULL)
146 return -1;
147 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
148 }
149
150
151 static inline int
152 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
153 const u8 *data, size_t data_len, int encrypt)
154 {
155 if (wpa_auth->cb.send_eapol == NULL)
156 return -1;
157 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
158 encrypt);
159 }
160
161
162 #ifdef CONFIG_MESH
163 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
164 const u8 *addr)
165 {
166 if (wpa_auth->cb.start_ampe == NULL)
167 return -1;
168 return wpa_auth->cb.start_ampe(wpa_auth->cb.ctx, addr);
169 }
170 #endif /* CONFIG_MESH */
171
172
173 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
174 int (*cb)(struct wpa_state_machine *sm, void *ctx),
175 void *cb_ctx)
176 {
177 if (wpa_auth->cb.for_each_sta == NULL)
178 return 0;
179 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
180 }
181
182
183 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
184 int (*cb)(struct wpa_authenticator *a, void *ctx),
185 void *cb_ctx)
186 {
187 if (wpa_auth->cb.for_each_auth == NULL)
188 return 0;
189 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
190 }
191
192
193 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
194 logger_level level, const char *txt)
195 {
196 if (wpa_auth->cb.logger == NULL)
197 return;
198 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
199 }
200
201
202 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
203 logger_level level, const char *fmt, ...)
204 {
205 char *format;
206 int maxlen;
207 va_list ap;
208
209 if (wpa_auth->cb.logger == NULL)
210 return;
211
212 maxlen = os_strlen(fmt) + 100;
213 format = os_malloc(maxlen);
214 if (!format)
215 return;
216
217 va_start(ap, fmt);
218 vsnprintf(format, maxlen, fmt, ap);
219 va_end(ap);
220
221 wpa_auth_logger(wpa_auth, addr, level, format);
222
223 os_free(format);
224 }
225
226
227 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
228 const u8 *addr)
229 {
230 if (wpa_auth->cb.disconnect == NULL)
231 return;
232 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
233 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
234 WLAN_REASON_PREV_AUTH_NOT_VALID);
235 }
236
237
238 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
239 {
240 int ret = 0;
241 #ifdef CONFIG_IEEE80211R
242 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
243 ret = 1;
244 #endif /* CONFIG_IEEE80211R */
245 #ifdef CONFIG_IEEE80211W
246 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
247 ret = 1;
248 #endif /* CONFIG_IEEE80211W */
249 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
250 ret = 1;
251 return ret;
252 }
253
254
255 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
256 {
257 struct wpa_authenticator *wpa_auth = eloop_ctx;
258
259 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
260 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
261 "initialization.");
262 } else {
263 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
264 wpa_hexdump_key(MSG_DEBUG, "GMK",
265 wpa_auth->group->GMK, WPA_GMK_LEN);
266 }
267
268 if (wpa_auth->conf.wpa_gmk_rekey) {
269 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
270 wpa_rekey_gmk, wpa_auth, NULL);
271 }
272 }
273
274
275 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
276 {
277 struct wpa_authenticator *wpa_auth = eloop_ctx;
278 struct wpa_group *group, *next;
279
280 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
281 group = wpa_auth->group;
282 while (group) {
283 wpa_group_get(wpa_auth, group);
284
285 group->GTKReKey = TRUE;
286 do {
287 group->changed = FALSE;
288 wpa_group_sm_step(wpa_auth, group);
289 } while (group->changed);
290
291 next = group->next;
292 wpa_group_put(wpa_auth, group);
293 group = next;
294 }
295
296 if (wpa_auth->conf.wpa_group_rekey) {
297 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
298 0, wpa_rekey_gtk, wpa_auth, NULL);
299 }
300 }
301
302
303 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
304 {
305 struct wpa_authenticator *wpa_auth = eloop_ctx;
306 struct wpa_state_machine *sm = timeout_ctx;
307
308 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
309 wpa_request_new_ptk(sm);
310 wpa_sm_step(sm);
311 }
312
313
314 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
315 {
316 if (sm->pmksa == ctx)
317 sm->pmksa = NULL;
318 return 0;
319 }
320
321
322 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
323 void *ctx)
324 {
325 struct wpa_authenticator *wpa_auth = ctx;
326 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
327 }
328
329
330 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
331 struct wpa_group *group)
332 {
333 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
334 u8 rkey[32];
335 unsigned long ptr;
336
337 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
338 return -1;
339 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
340
341 /*
342 * Counter = PRF-256(Random number, "Init Counter",
343 * Local MAC Address || Time)
344 */
345 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
346 wpa_get_ntp_timestamp(buf + ETH_ALEN);
347 ptr = (unsigned long) group;
348 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
349 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
350 return -1;
351
352 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
353 group->Counter, WPA_NONCE_LEN) < 0)
354 return -1;
355 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
356 group->Counter, WPA_NONCE_LEN);
357
358 return 0;
359 }
360
361
362 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
363 int vlan_id, int delay_init)
364 {
365 struct wpa_group *group;
366
367 group = os_zalloc(sizeof(struct wpa_group));
368 if (group == NULL)
369 return NULL;
370
371 group->GTKAuthenticator = TRUE;
372 group->vlan_id = vlan_id;
373 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
374
375 if (random_pool_ready() != 1) {
376 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
377 "for secure operations - update keys later when "
378 "the first station connects");
379 }
380
381 /*
382 * Set initial GMK/Counter value here. The actual values that will be
383 * used in negotiations will be set once the first station tries to
384 * connect. This allows more time for collecting additional randomness
385 * on embedded devices.
386 */
387 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
388 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
389 "initialization.");
390 os_free(group);
391 return NULL;
392 }
393
394 group->GInit = TRUE;
395 if (delay_init) {
396 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
397 "until Beacon frames have been configured");
398 /* Initialization is completed in wpa_init_keys(). */
399 } else {
400 wpa_group_sm_step(wpa_auth, group);
401 group->GInit = FALSE;
402 wpa_group_sm_step(wpa_auth, group);
403 }
404
405 return group;
406 }
407
408
409 /**
410 * wpa_init - Initialize WPA authenticator
411 * @addr: Authenticator address
412 * @conf: Configuration for WPA authenticator
413 * @cb: Callback functions for WPA authenticator
414 * Returns: Pointer to WPA authenticator data or %NULL on failure
415 */
416 struct wpa_authenticator * wpa_init(const u8 *addr,
417 struct wpa_auth_config *conf,
418 struct wpa_auth_callbacks *cb)
419 {
420 struct wpa_authenticator *wpa_auth;
421
422 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
423 if (wpa_auth == NULL)
424 return NULL;
425 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
426 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
427 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
428
429 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
430 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
431 os_free(wpa_auth);
432 return NULL;
433 }
434
435 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
436 if (wpa_auth->group == NULL) {
437 os_free(wpa_auth->wpa_ie);
438 os_free(wpa_auth);
439 return NULL;
440 }
441
442 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
443 wpa_auth);
444 if (wpa_auth->pmksa == NULL) {
445 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
446 os_free(wpa_auth->group);
447 os_free(wpa_auth->wpa_ie);
448 os_free(wpa_auth);
449 return NULL;
450 }
451
452 #ifdef CONFIG_IEEE80211R
453 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
454 if (wpa_auth->ft_pmk_cache == NULL) {
455 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
456 os_free(wpa_auth->group);
457 os_free(wpa_auth->wpa_ie);
458 pmksa_cache_auth_deinit(wpa_auth->pmksa);
459 os_free(wpa_auth);
460 return NULL;
461 }
462 #endif /* CONFIG_IEEE80211R */
463
464 if (wpa_auth->conf.wpa_gmk_rekey) {
465 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
466 wpa_rekey_gmk, wpa_auth, NULL);
467 }
468
469 if (wpa_auth->conf.wpa_group_rekey) {
470 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
471 wpa_rekey_gtk, wpa_auth, NULL);
472 }
473
474 #ifdef CONFIG_P2P
475 if (WPA_GET_BE32(conf->ip_addr_start)) {
476 int count = WPA_GET_BE32(conf->ip_addr_end) -
477 WPA_GET_BE32(conf->ip_addr_start) + 1;
478 if (count > 1000)
479 count = 1000;
480 if (count > 0)
481 wpa_auth->ip_pool = bitfield_alloc(count);
482 }
483 #endif /* CONFIG_P2P */
484
485 return wpa_auth;
486 }
487
488
489 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
490 {
491 struct wpa_group *group = wpa_auth->group;
492
493 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
494 "keys");
495 wpa_group_sm_step(wpa_auth, group);
496 group->GInit = FALSE;
497 wpa_group_sm_step(wpa_auth, group);
498 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
499 return -1;
500 return 0;
501 }
502
503
504 /**
505 * wpa_deinit - Deinitialize WPA authenticator
506 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
507 */
508 void wpa_deinit(struct wpa_authenticator *wpa_auth)
509 {
510 struct wpa_group *group, *prev;
511
512 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
513 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
514
515 #ifdef CONFIG_PEERKEY
516 while (wpa_auth->stsl_negotiations)
517 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
518 #endif /* CONFIG_PEERKEY */
519
520 pmksa_cache_auth_deinit(wpa_auth->pmksa);
521
522 #ifdef CONFIG_IEEE80211R
523 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
524 wpa_auth->ft_pmk_cache = NULL;
525 #endif /* CONFIG_IEEE80211R */
526
527 #ifdef CONFIG_P2P
528 bitfield_free(wpa_auth->ip_pool);
529 #endif /* CONFIG_P2P */
530
531
532 os_free(wpa_auth->wpa_ie);
533
534 group = wpa_auth->group;
535 while (group) {
536 prev = group;
537 group = group->next;
538 os_free(prev);
539 }
540
541 os_free(wpa_auth);
542 }
543
544
545 /**
546 * wpa_reconfig - Update WPA authenticator configuration
547 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
548 * @conf: Configuration for WPA authenticator
549 */
550 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
551 struct wpa_auth_config *conf)
552 {
553 struct wpa_group *group;
554 if (wpa_auth == NULL)
555 return 0;
556
557 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
558 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
559 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
560 return -1;
561 }
562
563 /*
564 * Reinitialize GTK to make sure it is suitable for the new
565 * configuration.
566 */
567 group = wpa_auth->group;
568 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
569 group->GInit = TRUE;
570 wpa_group_sm_step(wpa_auth, group);
571 group->GInit = FALSE;
572 wpa_group_sm_step(wpa_auth, group);
573
574 return 0;
575 }
576
577
578 struct wpa_state_machine *
579 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
580 const u8 *p2p_dev_addr)
581 {
582 struct wpa_state_machine *sm;
583
584 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
585 return NULL;
586
587 sm = os_zalloc(sizeof(struct wpa_state_machine));
588 if (sm == NULL)
589 return NULL;
590 os_memcpy(sm->addr, addr, ETH_ALEN);
591 if (p2p_dev_addr)
592 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
593
594 sm->wpa_auth = wpa_auth;
595 sm->group = wpa_auth->group;
596 wpa_group_get(sm->wpa_auth, sm->group);
597
598 return sm;
599 }
600
601
602 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
603 struct wpa_state_machine *sm)
604 {
605 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
606 return -1;
607
608 #ifdef CONFIG_IEEE80211R
609 if (sm->ft_completed) {
610 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
611 "FT authentication already completed - do not "
612 "start 4-way handshake");
613 /* Go to PTKINITDONE state to allow GTK rekeying */
614 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
615 return 0;
616 }
617 #endif /* CONFIG_IEEE80211R */
618
619 if (sm->started) {
620 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
621 sm->ReAuthenticationRequest = TRUE;
622 return wpa_sm_step(sm);
623 }
624
625 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
626 "start authentication");
627 sm->started = 1;
628
629 sm->Init = TRUE;
630 if (wpa_sm_step(sm) == 1)
631 return 1; /* should not really happen */
632 sm->Init = FALSE;
633 sm->AuthenticationRequest = TRUE;
634 return wpa_sm_step(sm);
635 }
636
637
638 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
639 {
640 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
641 * reassociates back to the same AP while the previous entry for the
642 * STA has not yet been removed. */
643 if (sm == NULL)
644 return;
645
646 sm->wpa_key_mgmt = 0;
647 }
648
649
650 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
651 {
652 #ifdef CONFIG_P2P
653 if (WPA_GET_BE32(sm->ip_addr)) {
654 u32 start;
655 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
656 "address %u.%u.%u.%u from " MACSTR,
657 sm->ip_addr[0], sm->ip_addr[1],
658 sm->ip_addr[2], sm->ip_addr[3],
659 MAC2STR(sm->addr));
660 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
661 bitfield_clear(sm->wpa_auth->ip_pool,
662 WPA_GET_BE32(sm->ip_addr) - start);
663 }
664 #endif /* CONFIG_P2P */
665 if (sm->GUpdateStationKeys) {
666 sm->group->GKeyDoneStations--;
667 sm->GUpdateStationKeys = FALSE;
668 }
669 #ifdef CONFIG_IEEE80211R
670 os_free(sm->assoc_resp_ftie);
671 wpabuf_free(sm->ft_pending_req_ies);
672 #endif /* CONFIG_IEEE80211R */
673 os_free(sm->last_rx_eapol_key);
674 os_free(sm->wpa_ie);
675 wpa_group_put(sm->wpa_auth, sm->group);
676 os_free(sm);
677 }
678
679
680 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
681 {
682 if (sm == NULL)
683 return;
684
685 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
686 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
687 "strict rekeying - force GTK rekey since STA "
688 "is leaving");
689 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
690 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
691 NULL);
692 }
693
694 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
695 sm->pending_1_of_4_timeout = 0;
696 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
697 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
698 if (sm->in_step_loop) {
699 /* Must not free state machine while wpa_sm_step() is running.
700 * Freeing will be completed in the end of wpa_sm_step(). */
701 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
702 "machine deinit for " MACSTR, MAC2STR(sm->addr));
703 sm->pending_deinit = 1;
704 } else
705 wpa_free_sta_sm(sm);
706 }
707
708
709 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
710 {
711 if (sm == NULL)
712 return;
713
714 sm->PTKRequest = TRUE;
715 sm->PTK_valid = 0;
716 }
717
718
719 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
720 const u8 *replay_counter)
721 {
722 int i;
723 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
724 if (!ctr[i].valid)
725 break;
726 if (os_memcmp(replay_counter, ctr[i].counter,
727 WPA_REPLAY_COUNTER_LEN) == 0)
728 return 1;
729 }
730 return 0;
731 }
732
733
734 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
735 const u8 *replay_counter)
736 {
737 int i;
738 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
739 if (ctr[i].valid &&
740 (replay_counter == NULL ||
741 os_memcmp(replay_counter, ctr[i].counter,
742 WPA_REPLAY_COUNTER_LEN) == 0))
743 ctr[i].valid = FALSE;
744 }
745 }
746
747
748 #ifdef CONFIG_IEEE80211R
749 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
750 struct wpa_state_machine *sm,
751 struct wpa_eapol_ie_parse *kde)
752 {
753 struct wpa_ie_data ie;
754 struct rsn_mdie *mdie;
755
756 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
757 ie.num_pmkid != 1 || ie.pmkid == NULL) {
758 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
759 "FT 4-way handshake message 2/4");
760 return -1;
761 }
762
763 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
764 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
765 sm->sup_pmk_r1_name, PMKID_LEN);
766
767 if (!kde->mdie || !kde->ftie) {
768 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
769 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
770 return -1;
771 }
772
773 mdie = (struct rsn_mdie *) (kde->mdie + 2);
774 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
775 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
776 MOBILITY_DOMAIN_ID_LEN) != 0) {
777 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
778 return -1;
779 }
780
781 if (sm->assoc_resp_ftie &&
782 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
783 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
784 2 + sm->assoc_resp_ftie[1]) != 0)) {
785 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
786 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
787 kde->ftie, kde->ftie_len);
788 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
789 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
790 return -1;
791 }
792
793 return 0;
794 }
795 #endif /* CONFIG_IEEE80211R */
796
797
798 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
799 struct wpa_state_machine *sm, int group)
800 {
801 /* Supplicant reported a Michael MIC error */
802 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
803 "received EAPOL-Key Error Request "
804 "(STA detected Michael MIC failure (group=%d))",
805 group);
806
807 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
808 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
809 "ignore Michael MIC failure report since "
810 "group cipher is not TKIP");
811 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
812 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
813 "ignore Michael MIC failure report since "
814 "pairwise cipher is not TKIP");
815 } else {
816 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
817 return 1; /* STA entry was removed */
818 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
819 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
820 }
821
822 /*
823 * Error report is not a request for a new key handshake, but since
824 * Authenticator may do it, let's change the keys now anyway.
825 */
826 wpa_request_new_ptk(sm);
827 return 0;
828 }
829
830
831 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
832 size_t data_len)
833 {
834 struct wpa_ptk PTK;
835 int ok = 0;
836 const u8 *pmk = NULL;
837 unsigned int pmk_len;
838
839 os_memset(&PTK, 0, sizeof(PTK));
840 for (;;) {
841 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
842 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
843 sm->p2p_dev_addr, pmk);
844 if (pmk == NULL)
845 break;
846 pmk_len = PMK_LEN;
847 } else {
848 pmk = sm->PMK;
849 pmk_len = sm->pmk_len;
850 }
851
852 wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK);
853
854 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
855 == 0) {
856 ok = 1;
857 break;
858 }
859
860 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
861 break;
862 }
863
864 if (!ok) {
865 wpa_printf(MSG_DEBUG,
866 "WPA: Earlier SNonce did not result in matching MIC");
867 return -1;
868 }
869
870 wpa_printf(MSG_DEBUG,
871 "WPA: Earlier SNonce resulted in matching MIC");
872 sm->alt_snonce_valid = 0;
873 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
874 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
875 sm->PTK_valid = TRUE;
876
877 return 0;
878 }
879
880
881 void wpa_receive(struct wpa_authenticator *wpa_auth,
882 struct wpa_state_machine *sm,
883 u8 *data, size_t data_len)
884 {
885 struct ieee802_1x_hdr *hdr;
886 struct wpa_eapol_key *key;
887 u16 key_info, key_data_length;
888 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
889 SMK_M1, SMK_M3, SMK_ERROR } msg;
890 char *msgtxt;
891 struct wpa_eapol_ie_parse kde;
892 const u8 *key_data;
893 size_t keyhdrlen, mic_len;
894 u8 *mic;
895
896 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
897 return;
898 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
899
900 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
901 keyhdrlen = sizeof(*key) + mic_len + 2;
902
903 if (data_len < sizeof(*hdr) + keyhdrlen) {
904 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
905 return;
906 }
907
908 hdr = (struct ieee802_1x_hdr *) data;
909 key = (struct wpa_eapol_key *) (hdr + 1);
910 mic = (u8 *) (key + 1);
911 key_info = WPA_GET_BE16(key->key_info);
912 key_data = mic + mic_len + 2;
913 key_data_length = WPA_GET_BE16(mic + mic_len);
914 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
915 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
916 MAC2STR(sm->addr), key_info, key->type,
917 (unsigned int) mic_len, key_data_length);
918 wpa_hexdump(MSG_MSGDUMP,
919 "WPA: EAPOL-Key header (ending before Key MIC)",
920 key, sizeof(*key));
921 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
922 mic, mic_len);
923 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
924 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
925 "key_data overflow (%d > %lu)",
926 key_data_length,
927 (unsigned long) (data_len - sizeof(*hdr) -
928 keyhdrlen));
929 return;
930 }
931
932 if (sm->wpa == WPA_VERSION_WPA2) {
933 if (key->type == EAPOL_KEY_TYPE_WPA) {
934 /*
935 * Some deployed station implementations seem to send
936 * msg 4/4 with incorrect type value in WPA2 mode.
937 */
938 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
939 "with unexpected WPA type in RSN mode");
940 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
941 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
942 "unexpected type %d in RSN mode",
943 key->type);
944 return;
945 }
946 } else {
947 if (key->type != EAPOL_KEY_TYPE_WPA) {
948 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
949 "unexpected type %d in WPA mode",
950 key->type);
951 return;
952 }
953 }
954
955 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
956 WPA_NONCE_LEN);
957 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
958 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
959
960 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
961 * are set */
962
963 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
964 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
965 if (key_info & WPA_KEY_INFO_ERROR) {
966 msg = SMK_ERROR;
967 msgtxt = "SMK Error";
968 } else {
969 msg = SMK_M1;
970 msgtxt = "SMK M1";
971 }
972 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
973 msg = SMK_M3;
974 msgtxt = "SMK M3";
975 } else if (key_info & WPA_KEY_INFO_REQUEST) {
976 msg = REQUEST;
977 msgtxt = "Request";
978 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
979 msg = GROUP_2;
980 msgtxt = "2/2 Group";
981 } else if (key_data_length == 0 ||
982 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
983 key_data_length == AES_BLOCK_SIZE)) {
984 msg = PAIRWISE_4;
985 msgtxt = "4/4 Pairwise";
986 } else {
987 msg = PAIRWISE_2;
988 msgtxt = "2/4 Pairwise";
989 }
990
991 /* TODO: key_info type validation for PeerKey */
992 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
993 msg == GROUP_2) {
994 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
995 if (sm->pairwise == WPA_CIPHER_CCMP ||
996 sm->pairwise == WPA_CIPHER_GCMP) {
997 if (wpa_use_aes_cmac(sm) &&
998 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
999 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
1000 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1001 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1002 wpa_auth_logger(wpa_auth, sm->addr,
1003 LOGGER_WARNING,
1004 "advertised support for "
1005 "AES-128-CMAC, but did not "
1006 "use it");
1007 return;
1008 }
1009
1010 if (!wpa_use_aes_cmac(sm) &&
1011 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1012 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1013 wpa_auth_logger(wpa_auth, sm->addr,
1014 LOGGER_WARNING,
1015 "did not use HMAC-SHA1-AES "
1016 "with CCMP/GCMP");
1017 return;
1018 }
1019 }
1020
1021 if ((wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1022 wpa_key_mgmt_fils(sm->wpa_key_mgmt)) &&
1023 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1024 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1025 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1026 return;
1027 }
1028 }
1029
1030 if (key_info & WPA_KEY_INFO_REQUEST) {
1031 if (sm->req_replay_counter_used &&
1032 os_memcmp(key->replay_counter, sm->req_replay_counter,
1033 WPA_REPLAY_COUNTER_LEN) <= 0) {
1034 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1035 "received EAPOL-Key request with "
1036 "replayed counter");
1037 return;
1038 }
1039 }
1040
1041 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1042 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1043 int i;
1044
1045 if (msg == PAIRWISE_2 &&
1046 wpa_replay_counter_valid(sm->prev_key_replay,
1047 key->replay_counter) &&
1048 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1049 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1050 {
1051 /*
1052 * Some supplicant implementations (e.g., Windows XP
1053 * WZC) update SNonce for each EAPOL-Key 2/4. This
1054 * breaks the workaround on accepting any of the
1055 * pending requests, so allow the SNonce to be updated
1056 * even if we have already sent out EAPOL-Key 3/4.
1057 */
1058 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1059 "Process SNonce update from STA "
1060 "based on retransmitted EAPOL-Key "
1061 "1/4");
1062 sm->update_snonce = 1;
1063 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1064 sm->alt_snonce_valid = TRUE;
1065 os_memcpy(sm->alt_replay_counter,
1066 sm->key_replay[0].counter,
1067 WPA_REPLAY_COUNTER_LEN);
1068 goto continue_processing;
1069 }
1070
1071 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1072 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1073 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1074 WPA_REPLAY_COUNTER_LEN) == 0) {
1075 /*
1076 * Supplicant may still be using the old SNonce since
1077 * there was two EAPOL-Key 2/4 messages and they had
1078 * different SNonce values.
1079 */
1080 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1081 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1082 goto continue_processing;
1083 }
1084
1085 if (msg == PAIRWISE_2 &&
1086 wpa_replay_counter_valid(sm->prev_key_replay,
1087 key->replay_counter) &&
1088 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1089 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1090 "ignore retransmitted EAPOL-Key %s - "
1091 "SNonce did not change", msgtxt);
1092 } else {
1093 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1094 "received EAPOL-Key %s with "
1095 "unexpected replay counter", msgtxt);
1096 }
1097 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1098 if (!sm->key_replay[i].valid)
1099 break;
1100 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1101 sm->key_replay[i].counter,
1102 WPA_REPLAY_COUNTER_LEN);
1103 }
1104 wpa_hexdump(MSG_DEBUG, "received replay counter",
1105 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1106 return;
1107 }
1108
1109 continue_processing:
1110 #ifdef CONFIG_FILS
1111 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1112 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1113 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1114 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1115 return;
1116 }
1117 #endif /* CONFIG_FILS */
1118
1119 switch (msg) {
1120 case PAIRWISE_2:
1121 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1122 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1123 (!sm->update_snonce ||
1124 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1125 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1126 "received EAPOL-Key msg 2/4 in "
1127 "invalid state (%d) - dropped",
1128 sm->wpa_ptk_state);
1129 return;
1130 }
1131 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1132 if (sm->group->reject_4way_hs_for_entropy) {
1133 /*
1134 * The system did not have enough entropy to generate
1135 * strong random numbers. Reject the first 4-way
1136 * handshake(s) and collect some entropy based on the
1137 * information from it. Once enough entropy is
1138 * available, the next atempt will trigger GMK/Key
1139 * Counter update and the station will be allowed to
1140 * continue.
1141 */
1142 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1143 "collect more entropy for random number "
1144 "generation");
1145 random_mark_pool_ready();
1146 wpa_sta_disconnect(wpa_auth, sm->addr);
1147 return;
1148 }
1149 break;
1150 case PAIRWISE_4:
1151 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1152 !sm->PTK_valid) {
1153 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1154 "received EAPOL-Key msg 4/4 in "
1155 "invalid state (%d) - dropped",
1156 sm->wpa_ptk_state);
1157 return;
1158 }
1159 break;
1160 case GROUP_2:
1161 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1162 || !sm->PTK_valid) {
1163 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1164 "received EAPOL-Key msg 2/2 in "
1165 "invalid state (%d) - dropped",
1166 sm->wpa_ptk_group_state);
1167 return;
1168 }
1169 break;
1170 #ifdef CONFIG_PEERKEY
1171 case SMK_M1:
1172 case SMK_M3:
1173 case SMK_ERROR:
1174 if (!wpa_auth->conf.peerkey) {
1175 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1176 "PeerKey use disabled - ignoring message");
1177 return;
1178 }
1179 if (!sm->PTK_valid) {
1180 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1181 "received EAPOL-Key msg SMK in "
1182 "invalid state - dropped");
1183 return;
1184 }
1185 break;
1186 #else /* CONFIG_PEERKEY */
1187 case SMK_M1:
1188 case SMK_M3:
1189 case SMK_ERROR:
1190 return; /* STSL disabled - ignore SMK messages */
1191 #endif /* CONFIG_PEERKEY */
1192 case REQUEST:
1193 break;
1194 }
1195
1196 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1197 "received EAPOL-Key frame (%s)", msgtxt);
1198
1199 if (key_info & WPA_KEY_INFO_ACK) {
1200 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1201 "received invalid EAPOL-Key: Key Ack set");
1202 return;
1203 }
1204
1205 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1206 !(key_info & WPA_KEY_INFO_MIC)) {
1207 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1208 "received invalid EAPOL-Key: Key MIC not set");
1209 return;
1210 }
1211
1212 #ifdef CONFIG_FILS
1213 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1214 (key_info & WPA_KEY_INFO_MIC)) {
1215 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1216 "received invalid EAPOL-Key: Key MIC set");
1217 return;
1218 }
1219 #endif /* CONFIG_FILS */
1220
1221 sm->MICVerified = FALSE;
1222 if (sm->PTK_valid && !sm->update_snonce) {
1223 if (mic_len &&
1224 wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
1225 data_len) &&
1226 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1227 wpa_try_alt_snonce(sm, data, data_len))) {
1228 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1229 "received EAPOL-Key with invalid MIC");
1230 return;
1231 }
1232 #ifdef CONFIG_FILS
1233 if (!mic_len &&
1234 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1235 &key_data_length) < 0) {
1236 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1237 "received EAPOL-Key with invalid MIC");
1238 return;
1239 }
1240 #endif /* CONFIG_FILS */
1241 sm->MICVerified = TRUE;
1242 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1243 sm->pending_1_of_4_timeout = 0;
1244 }
1245
1246 if (key_info & WPA_KEY_INFO_REQUEST) {
1247 if (sm->MICVerified) {
1248 sm->req_replay_counter_used = 1;
1249 os_memcpy(sm->req_replay_counter, key->replay_counter,
1250 WPA_REPLAY_COUNTER_LEN);
1251 } else {
1252 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1253 "received EAPOL-Key request with "
1254 "invalid MIC");
1255 return;
1256 }
1257
1258 /*
1259 * TODO: should decrypt key data field if encryption was used;
1260 * even though MAC address KDE is not normally encrypted,
1261 * supplicant is allowed to encrypt it.
1262 */
1263 if (msg == SMK_ERROR) {
1264 #ifdef CONFIG_PEERKEY
1265 wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
1266 #endif /* CONFIG_PEERKEY */
1267 return;
1268 } else if (key_info & WPA_KEY_INFO_ERROR) {
1269 if (wpa_receive_error_report(
1270 wpa_auth, sm,
1271 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1272 return; /* STA entry was removed */
1273 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1274 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1275 "received EAPOL-Key Request for new "
1276 "4-Way Handshake");
1277 wpa_request_new_ptk(sm);
1278 #ifdef CONFIG_PEERKEY
1279 } else if (msg == SMK_M1) {
1280 wpa_smk_m1(wpa_auth, sm, key, key_data,
1281 key_data_length);
1282 #endif /* CONFIG_PEERKEY */
1283 } else if (key_data_length > 0 &&
1284 wpa_parse_kde_ies(key_data, key_data_length,
1285 &kde) == 0 &&
1286 kde.mac_addr) {
1287 } else {
1288 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1289 "received EAPOL-Key Request for GTK "
1290 "rekeying");
1291 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1292 wpa_rekey_gtk(wpa_auth, NULL);
1293 }
1294 } else {
1295 /* Do not allow the same key replay counter to be reused. */
1296 wpa_replay_counter_mark_invalid(sm->key_replay,
1297 key->replay_counter);
1298
1299 if (msg == PAIRWISE_2) {
1300 /*
1301 * Maintain a copy of the pending EAPOL-Key frames in
1302 * case the EAPOL-Key frame was retransmitted. This is
1303 * needed to allow EAPOL-Key msg 2/4 reply to another
1304 * pending msg 1/4 to update the SNonce to work around
1305 * unexpected supplicant behavior.
1306 */
1307 os_memcpy(sm->prev_key_replay, sm->key_replay,
1308 sizeof(sm->key_replay));
1309 } else {
1310 os_memset(sm->prev_key_replay, 0,
1311 sizeof(sm->prev_key_replay));
1312 }
1313
1314 /*
1315 * Make sure old valid counters are not accepted anymore and
1316 * do not get copied again.
1317 */
1318 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1319 }
1320
1321 #ifdef CONFIG_PEERKEY
1322 if (msg == SMK_M3) {
1323 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
1324 return;
1325 }
1326 #endif /* CONFIG_PEERKEY */
1327
1328 os_free(sm->last_rx_eapol_key);
1329 sm->last_rx_eapol_key = os_malloc(data_len);
1330 if (sm->last_rx_eapol_key == NULL)
1331 return;
1332 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1333 sm->last_rx_eapol_key_len = data_len;
1334
1335 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1336 sm->EAPOLKeyReceived = TRUE;
1337 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1338 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1339 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1340 wpa_sm_step(sm);
1341 }
1342
1343
1344 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1345 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1346 {
1347 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1348 u8 *pos;
1349 int ret = 0;
1350
1351 /* GTK = PRF-X(GMK, "Group key expansion",
1352 * AA || GNonce || Time || random data)
1353 * The example described in the IEEE 802.11 standard uses only AA and
1354 * GNonce as inputs here. Add some more entropy since this derivation
1355 * is done only at the Authenticator and as such, does not need to be
1356 * exactly same.
1357 */
1358 os_memcpy(data, addr, ETH_ALEN);
1359 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1360 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1361 wpa_get_ntp_timestamp(pos);
1362 pos += 8;
1363 if (random_get_bytes(pos, 16) < 0)
1364 ret = -1;
1365
1366 #ifdef CONFIG_IEEE80211W
1367 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1368 #else /* CONFIG_IEEE80211W */
1369 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1370 < 0)
1371 ret = -1;
1372 #endif /* CONFIG_IEEE80211W */
1373
1374 return ret;
1375 }
1376
1377
1378 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1379 {
1380 struct wpa_authenticator *wpa_auth = eloop_ctx;
1381 struct wpa_state_machine *sm = timeout_ctx;
1382
1383 sm->pending_1_of_4_timeout = 0;
1384 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1385 sm->TimeoutEvt = TRUE;
1386 wpa_sm_step(sm);
1387 }
1388
1389
1390 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1391 struct wpa_state_machine *sm, int key_info,
1392 const u8 *key_rsc, const u8 *nonce,
1393 const u8 *kde, size_t kde_len,
1394 int keyidx, int encr, int force_version)
1395 {
1396 struct ieee802_1x_hdr *hdr;
1397 struct wpa_eapol_key *key;
1398 size_t len, mic_len, keyhdrlen;
1399 int alg;
1400 int key_data_len, pad_len = 0;
1401 u8 *buf, *pos;
1402 int version, pairwise;
1403 int i;
1404 u8 *key_mic, *key_data;
1405
1406 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
1407 keyhdrlen = sizeof(*key) + mic_len + 2;
1408
1409 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1410
1411 if (force_version)
1412 version = force_version;
1413 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1414 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1415 wpa_key_mgmt_fils(sm->wpa_key_mgmt))
1416 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1417 else if (wpa_use_aes_cmac(sm))
1418 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1419 else if (sm->pairwise != WPA_CIPHER_TKIP)
1420 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1421 else
1422 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1423
1424 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1425
1426 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1427 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1428 "encr=%d)",
1429 version,
1430 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1431 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1432 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1433 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1434 pairwise, (unsigned long) kde_len, keyidx, encr);
1435
1436 key_data_len = kde_len;
1437
1438 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1439 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1440 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1441 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1442 pad_len = key_data_len % 8;
1443 if (pad_len)
1444 pad_len = 8 - pad_len;
1445 key_data_len += pad_len + 8;
1446 }
1447
1448 len += key_data_len;
1449 if (!mic_len && encr)
1450 len += AES_BLOCK_SIZE;
1451
1452 hdr = os_zalloc(len);
1453 if (hdr == NULL)
1454 return;
1455 hdr->version = wpa_auth->conf.eapol_version;
1456 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1457 hdr->length = host_to_be16(len - sizeof(*hdr));
1458 key = (struct wpa_eapol_key *) (hdr + 1);
1459 key_mic = (u8 *) (key + 1);
1460 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1461
1462 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1463 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1464 key_info |= version;
1465 if (encr && sm->wpa == WPA_VERSION_WPA2)
1466 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1467 if (sm->wpa != WPA_VERSION_WPA2)
1468 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1469 WPA_PUT_BE16(key->key_info, key_info);
1470
1471 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1472 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1473 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1474 WPA_PUT_BE16(key->key_length, 0);
1475
1476 /* FIX: STSL: what to use as key_replay_counter? */
1477 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1478 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1479 os_memcpy(sm->key_replay[i].counter,
1480 sm->key_replay[i - 1].counter,
1481 WPA_REPLAY_COUNTER_LEN);
1482 }
1483 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1484 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1485 WPA_REPLAY_COUNTER_LEN);
1486 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1487 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1488 sm->key_replay[0].valid = TRUE;
1489
1490 if (nonce)
1491 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1492
1493 if (key_rsc)
1494 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1495
1496 if (kde && !encr) {
1497 os_memcpy(key_data, kde, kde_len);
1498 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1499 #ifdef CONFIG_FILS
1500 } else if (!mic_len) {
1501 const u8 *aad[1];
1502 size_t aad_len[1];
1503
1504 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1505 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1506 kde, kde_len);
1507
1508 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1509 sm->PTK.kek, sm->PTK.kek_len);
1510 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1511 * to Key Data (exclusive). */
1512 aad[0] = (u8 *) hdr;
1513 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1514 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1515 1, aad, aad_len, key_mic + 2) < 0) {
1516 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1517 return;
1518 }
1519
1520 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1521 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1522 #endif /* CONFIG_FILS */
1523 } else if (encr && kde) {
1524 buf = os_zalloc(key_data_len);
1525 if (buf == NULL) {
1526 os_free(hdr);
1527 return;
1528 }
1529 pos = buf;
1530 os_memcpy(pos, kde, kde_len);
1531 pos += kde_len;
1532
1533 if (pad_len)
1534 *pos++ = 0xdd;
1535
1536 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1537 buf, key_data_len);
1538 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1539 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1540 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1541 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1542 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1543 (key_data_len - 8) / 8, buf, key_data)) {
1544 os_free(hdr);
1545 os_free(buf);
1546 return;
1547 }
1548 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1549 #ifndef CONFIG_NO_RC4
1550 } else if (sm->PTK.kek_len == 16) {
1551 u8 ek[32];
1552 os_memcpy(key->key_iv,
1553 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1554 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1555 os_memcpy(ek, key->key_iv, 16);
1556 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1557 os_memcpy(key_data, buf, key_data_len);
1558 rc4_skip(ek, 32, 256, key_data, key_data_len);
1559 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1560 #endif /* CONFIG_NO_RC4 */
1561 } else {
1562 os_free(hdr);
1563 os_free(buf);
1564 return;
1565 }
1566 os_free(buf);
1567 }
1568
1569 if (key_info & WPA_KEY_INFO_MIC) {
1570 if (!sm->PTK_valid || !mic_len) {
1571 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1572 "PTK not valid when sending EAPOL-Key "
1573 "frame");
1574 os_free(hdr);
1575 return;
1576 }
1577
1578 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1579 sm->wpa_key_mgmt, version,
1580 (u8 *) hdr, len, key_mic);
1581 #ifdef CONFIG_TESTING_OPTIONS
1582 if (!pairwise &&
1583 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1584 drand48() <
1585 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1586 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1587 "Corrupting group EAPOL-Key Key MIC");
1588 key_mic[0]++;
1589 }
1590 #endif /* CONFIG_TESTING_OPTIONS */
1591 }
1592
1593 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1594 1);
1595 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1596 sm->pairwise_set);
1597 os_free(hdr);
1598 }
1599
1600
1601 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1602 struct wpa_state_machine *sm, int key_info,
1603 const u8 *key_rsc, const u8 *nonce,
1604 const u8 *kde, size_t kde_len,
1605 int keyidx, int encr)
1606 {
1607 int timeout_ms;
1608 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1609 int ctr;
1610
1611 if (sm == NULL)
1612 return;
1613
1614 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1615 keyidx, encr, 0);
1616
1617 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1618 if (ctr == 1 && wpa_auth->conf.tx_status)
1619 timeout_ms = pairwise ? eapol_key_timeout_first :
1620 eapol_key_timeout_first_group;
1621 else
1622 timeout_ms = eapol_key_timeout_subseq;
1623 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1624 sm->pending_1_of_4_timeout = 1;
1625 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1626 "counter %d)", timeout_ms, ctr);
1627 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1628 wpa_send_eapol_timeout, wpa_auth, sm);
1629 }
1630
1631
1632 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
1633 size_t data_len)
1634 {
1635 struct ieee802_1x_hdr *hdr;
1636 struct wpa_eapol_key *key;
1637 u16 key_info;
1638 int ret = 0;
1639 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1640 size_t mic_len = wpa_mic_len(akmp);
1641
1642 if (data_len < sizeof(*hdr) + sizeof(*key))
1643 return -1;
1644
1645 hdr = (struct ieee802_1x_hdr *) data;
1646 key = (struct wpa_eapol_key *) (hdr + 1);
1647 mic_pos = (u8 *) (key + 1);
1648 key_info = WPA_GET_BE16(key->key_info);
1649 os_memcpy(mic, mic_pos, mic_len);
1650 os_memset(mic_pos, 0, mic_len);
1651 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1652 key_info & WPA_KEY_INFO_TYPE_MASK,
1653 data, data_len, mic_pos) ||
1654 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1655 ret = -1;
1656 os_memcpy(mic_pos, mic, mic_len);
1657 return ret;
1658 }
1659
1660
1661 void wpa_remove_ptk(struct wpa_state_machine *sm)
1662 {
1663 sm->PTK_valid = FALSE;
1664 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1665 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1666 sm->pairwise_set = FALSE;
1667 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1668 }
1669
1670
1671 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1672 {
1673 int remove_ptk = 1;
1674
1675 if (sm == NULL)
1676 return -1;
1677
1678 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1679 "event %d notification", event);
1680
1681 switch (event) {
1682 case WPA_AUTH:
1683 #ifdef CONFIG_MESH
1684 /* PTKs are derived through AMPE */
1685 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1686 /* not mesh */
1687 break;
1688 }
1689 return 0;
1690 #endif /* CONFIG_MESH */
1691 case WPA_ASSOC:
1692 break;
1693 case WPA_DEAUTH:
1694 case WPA_DISASSOC:
1695 sm->DeauthenticationRequest = TRUE;
1696 break;
1697 case WPA_REAUTH:
1698 case WPA_REAUTH_EAPOL:
1699 if (!sm->started) {
1700 /*
1701 * When using WPS, we may end up here if the STA
1702 * manages to re-associate without the previous STA
1703 * entry getting removed. Consequently, we need to make
1704 * sure that the WPA state machines gets initialized
1705 * properly at this point.
1706 */
1707 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1708 "started - initialize now");
1709 sm->started = 1;
1710 sm->Init = TRUE;
1711 if (wpa_sm_step(sm) == 1)
1712 return 1; /* should not really happen */
1713 sm->Init = FALSE;
1714 sm->AuthenticationRequest = TRUE;
1715 break;
1716 }
1717 if (sm->GUpdateStationKeys) {
1718 /*
1719 * Reauthentication cancels the pending group key
1720 * update for this STA.
1721 */
1722 sm->group->GKeyDoneStations--;
1723 sm->GUpdateStationKeys = FALSE;
1724 sm->PtkGroupInit = TRUE;
1725 }
1726 sm->ReAuthenticationRequest = TRUE;
1727 break;
1728 case WPA_ASSOC_FT:
1729 #ifdef CONFIG_IEEE80211R
1730 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1731 "after association");
1732 wpa_ft_install_ptk(sm);
1733
1734 /* Using FT protocol, not WPA auth state machine */
1735 sm->ft_completed = 1;
1736 return 0;
1737 #else /* CONFIG_IEEE80211R */
1738 break;
1739 #endif /* CONFIG_IEEE80211R */
1740 }
1741
1742 #ifdef CONFIG_IEEE80211R
1743 sm->ft_completed = 0;
1744 #endif /* CONFIG_IEEE80211R */
1745
1746 #ifdef CONFIG_IEEE80211W
1747 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1748 remove_ptk = 0;
1749 #endif /* CONFIG_IEEE80211W */
1750
1751 if (remove_ptk) {
1752 sm->PTK_valid = FALSE;
1753 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1754
1755 if (event != WPA_REAUTH_EAPOL)
1756 wpa_remove_ptk(sm);
1757 }
1758
1759 if (sm->in_step_loop) {
1760 /*
1761 * wpa_sm_step() is already running - avoid recursive call to
1762 * it by making the existing loop process the new update.
1763 */
1764 sm->changed = TRUE;
1765 return 0;
1766 }
1767 return wpa_sm_step(sm);
1768 }
1769
1770
1771 SM_STATE(WPA_PTK, INITIALIZE)
1772 {
1773 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1774 if (sm->Init) {
1775 /* Init flag is not cleared here, so avoid busy
1776 * loop by claiming nothing changed. */
1777 sm->changed = FALSE;
1778 }
1779
1780 sm->keycount = 0;
1781 if (sm->GUpdateStationKeys)
1782 sm->group->GKeyDoneStations--;
1783 sm->GUpdateStationKeys = FALSE;
1784 if (sm->wpa == WPA_VERSION_WPA)
1785 sm->PInitAKeys = FALSE;
1786 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1787 * Local AA > Remote AA)) */) {
1788 sm->Pair = TRUE;
1789 }
1790 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1791 wpa_remove_ptk(sm);
1792 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1793 sm->TimeoutCtr = 0;
1794 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1795 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1796 WPA_EAPOL_authorized, 0);
1797 }
1798 }
1799
1800
1801 SM_STATE(WPA_PTK, DISCONNECT)
1802 {
1803 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1804 sm->Disconnect = FALSE;
1805 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1806 }
1807
1808
1809 SM_STATE(WPA_PTK, DISCONNECTED)
1810 {
1811 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1812 sm->DeauthenticationRequest = FALSE;
1813 }
1814
1815
1816 SM_STATE(WPA_PTK, AUTHENTICATION)
1817 {
1818 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1819 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1820 sm->PTK_valid = FALSE;
1821 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1822 1);
1823 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1824 sm->AuthenticationRequest = FALSE;
1825 }
1826
1827
1828 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1829 struct wpa_group *group)
1830 {
1831 if (group->first_sta_seen)
1832 return;
1833 /*
1834 * System has run bit further than at the time hostapd was started
1835 * potentially very early during boot up. This provides better chances
1836 * of collecting more randomness on embedded systems. Re-initialize the
1837 * GMK and Counter here to improve their strength if there was not
1838 * enough entropy available immediately after system startup.
1839 */
1840 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1841 "station");
1842 if (random_pool_ready() != 1) {
1843 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1844 "to proceed - reject first 4-way handshake");
1845 group->reject_4way_hs_for_entropy = TRUE;
1846 } else {
1847 group->first_sta_seen = TRUE;
1848 group->reject_4way_hs_for_entropy = FALSE;
1849 }
1850
1851 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1852 wpa_gtk_update(wpa_auth, group) < 0 ||
1853 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1854 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1855 group->first_sta_seen = FALSE;
1856 group->reject_4way_hs_for_entropy = TRUE;
1857 }
1858 }
1859
1860
1861 SM_STATE(WPA_PTK, AUTHENTICATION2)
1862 {
1863 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1864
1865 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1866 sm->ReAuthenticationRequest = FALSE;
1867
1868 /*
1869 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1870 * ambiguous. The Authenticator state machine uses a counter that is
1871 * incremented by one for each 4-way handshake. However, the security
1872 * analysis of 4-way handshake points out that unpredictable nonces
1873 * help in preventing precomputation attacks. Instead of the state
1874 * machine definition, use an unpredictable nonce value here to provide
1875 * stronger protection against potential precomputation attacks.
1876 */
1877 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1878 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1879 "ANonce.");
1880 sm->Disconnect = TRUE;
1881 return;
1882 }
1883 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1884 WPA_NONCE_LEN);
1885 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1886 * logical place than INITIALIZE since AUTHENTICATION2 can be
1887 * re-entered on ReAuthenticationRequest without going through
1888 * INITIALIZE. */
1889 sm->TimeoutCtr = 0;
1890 }
1891
1892
1893 SM_STATE(WPA_PTK, INITPMK)
1894 {
1895 u8 msk[2 * PMK_LEN];
1896 size_t len = 2 * PMK_LEN;
1897
1898 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1899 #ifdef CONFIG_IEEE80211R
1900 sm->xxkey_len = 0;
1901 #endif /* CONFIG_IEEE80211R */
1902 if (sm->pmksa) {
1903 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1904 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
1905 sm->pmk_len = sm->pmksa->pmk_len;
1906 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1907 unsigned int pmk_len;
1908
1909 if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
1910 pmk_len = PMK_LEN_SUITE_B_192;
1911 else
1912 pmk_len = PMK_LEN;
1913 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1914 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
1915 pmk_len);
1916 if (len < pmk_len) {
1917 wpa_printf(MSG_DEBUG,
1918 "WPA: MSK not long enough (%u) to create PMK (%u)",
1919 (unsigned int) len, (unsigned int) pmk_len);
1920 sm->Disconnect = TRUE;
1921 return;
1922 }
1923 os_memcpy(sm->PMK, msk, pmk_len);
1924 sm->pmk_len = pmk_len;
1925 #ifdef CONFIG_IEEE80211R
1926 if (len >= 2 * PMK_LEN) {
1927 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1928 sm->xxkey_len = PMK_LEN;
1929 }
1930 #endif /* CONFIG_IEEE80211R */
1931 } else {
1932 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
1933 sm->wpa_auth->cb.get_msk);
1934 sm->Disconnect = TRUE;
1935 return;
1936 }
1937 os_memset(msk, 0, sizeof(msk));
1938
1939 sm->req_replay_counter_used = 0;
1940 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1941 * will break reauthentication since EAPOL state machines may not be
1942 * get into AUTHENTICATING state that clears keyRun before WPA state
1943 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1944 * state and takes PMK from the previously used AAA Key. This will
1945 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1946 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1947 * be good workaround for this issue. */
1948 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1949 }
1950
1951
1952 SM_STATE(WPA_PTK, INITPSK)
1953 {
1954 const u8 *psk;
1955 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1956 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1957 if (psk) {
1958 os_memcpy(sm->PMK, psk, PMK_LEN);
1959 sm->pmk_len = PMK_LEN;
1960 #ifdef CONFIG_IEEE80211R
1961 os_memcpy(sm->xxkey, psk, PMK_LEN);
1962 sm->xxkey_len = PMK_LEN;
1963 #endif /* CONFIG_IEEE80211R */
1964 }
1965 sm->req_replay_counter_used = 0;
1966 }
1967
1968
1969 SM_STATE(WPA_PTK, PTKSTART)
1970 {
1971 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1972 size_t pmkid_len = 0;
1973
1974 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1975 sm->PTKRequest = FALSE;
1976 sm->TimeoutEvt = FALSE;
1977 sm->alt_snonce_valid = FALSE;
1978
1979 sm->TimeoutCtr++;
1980 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1981 /* No point in sending the EAPOL-Key - we will disconnect
1982 * immediately following this. */
1983 return;
1984 }
1985
1986 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1987 "sending 1/4 msg of 4-Way Handshake");
1988 /*
1989 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1990 * one possible PSK for this STA.
1991 */
1992 if (sm->wpa == WPA_VERSION_WPA2 &&
1993 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
1994 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
1995 pmkid = buf;
1996 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1997 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1998 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1999 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2000 if (sm->pmksa) {
2001 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2002 sm->pmksa->pmkid, PMKID_LEN);
2003 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2004 /* No KCK available to derive PMKID */
2005 pmkid = NULL;
2006 } else {
2007 /*
2008 * Calculate PMKID since no PMKSA cache entry was
2009 * available with pre-calculated PMKID.
2010 */
2011 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2012 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2013 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
2014 }
2015 }
2016 wpa_send_eapol(sm->wpa_auth, sm,
2017 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2018 sm->ANonce, pmkid, pmkid_len, 0, 0);
2019 }
2020
2021
2022 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2023 const u8 *pmk, unsigned int pmk_len,
2024 struct wpa_ptk *ptk)
2025 {
2026 #ifdef CONFIG_IEEE80211R
2027 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2028 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2029 #endif /* CONFIG_IEEE80211R */
2030
2031 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2032 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2033 ptk, sm->wpa_key_mgmt, sm->pairwise);
2034 }
2035
2036
2037 #ifdef CONFIG_FILS
2038 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2039 u8 *buf, size_t buf_len, u16 *_key_data_len)
2040 {
2041 struct ieee802_1x_hdr *hdr;
2042 struct wpa_eapol_key *key;
2043 u8 *pos;
2044 u16 key_data_len;
2045 u8 *tmp;
2046 const u8 *aad[1];
2047 size_t aad_len[1];
2048
2049 hdr = (struct ieee802_1x_hdr *) buf;
2050 key = (struct wpa_eapol_key *) (hdr + 1);
2051 pos = (u8 *) (key + 1);
2052 key_data_len = WPA_GET_BE16(pos);
2053 if (key_data_len < AES_BLOCK_SIZE ||
2054 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2055 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2056 "No room for AES-SIV data in the frame");
2057 return -1;
2058 }
2059 pos += 2; /* Pointing at the Encrypted Key Data field */
2060
2061 tmp = os_malloc(key_data_len);
2062 if (!tmp)
2063 return -1;
2064
2065 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2066 * to Key Data (exclusive). */
2067 aad[0] = buf;
2068 aad_len[0] = pos - buf;
2069 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2070 1, aad, aad_len, tmp) < 0) {
2071 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2072 "Invalid AES-SIV data in the frame");
2073 bin_clear_free(tmp, key_data_len);
2074 return -1;
2075 }
2076
2077 /* AEAD decryption and validation completed successfully */
2078 key_data_len -= AES_BLOCK_SIZE;
2079 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2080 tmp, key_data_len);
2081
2082 /* Replace Key Data field with the decrypted version */
2083 os_memcpy(pos, tmp, key_data_len);
2084 pos -= 2; /* Key Data Length field */
2085 WPA_PUT_BE16(pos, key_data_len);
2086 bin_clear_free(tmp, key_data_len);
2087 if (_key_data_len)
2088 *_key_data_len = key_data_len;
2089 return 0;
2090 }
2091 #endif /* CONFIG_FILS */
2092
2093
2094 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2095 {
2096 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2097 struct wpa_ptk PTK;
2098 int ok = 0, psk_found = 0;
2099 const u8 *pmk = NULL;
2100 unsigned int pmk_len;
2101 int ft;
2102 const u8 *eapol_key_ie, *key_data, *mic;
2103 u16 key_data_length;
2104 size_t mic_len, eapol_key_ie_len;
2105 struct ieee802_1x_hdr *hdr;
2106 struct wpa_eapol_key *key;
2107 struct wpa_eapol_ie_parse kde;
2108
2109 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2110 sm->EAPOLKeyReceived = FALSE;
2111 sm->update_snonce = FALSE;
2112 os_memset(&PTK, 0, sizeof(PTK));
2113
2114 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
2115
2116 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2117 * WPA-PSK: iterate through possible PSKs and select the one matching
2118 * the packet */
2119 for (;;) {
2120 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2121 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2122 sm->p2p_dev_addr, pmk);
2123 if (pmk == NULL)
2124 break;
2125 psk_found = 1;
2126 pmk_len = PMK_LEN;
2127 } else {
2128 pmk = sm->PMK;
2129 pmk_len = sm->pmk_len;
2130 }
2131
2132 wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK);
2133
2134 if (mic_len &&
2135 wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
2136 sm->last_rx_eapol_key,
2137 sm->last_rx_eapol_key_len) == 0) {
2138 ok = 1;
2139 break;
2140 }
2141
2142 #ifdef CONFIG_FILS
2143 if (!mic_len &&
2144 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2145 sm->last_rx_eapol_key_len, NULL) == 0) {
2146 ok = 1;
2147 break;
2148 }
2149 #endif /* CONFIG_FILS */
2150
2151 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
2152 break;
2153 }
2154
2155 if (!ok) {
2156 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2157 "invalid MIC in msg 2/4 of 4-Way Handshake");
2158 if (psk_found)
2159 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2160 return;
2161 }
2162
2163 /*
2164 * Note: last_rx_eapol_key length fields have already been validated in
2165 * wpa_receive().
2166 */
2167 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2168 key = (struct wpa_eapol_key *) (hdr + 1);
2169 mic = (u8 *) (key + 1);
2170 key_data = mic + mic_len + 2;
2171 key_data_length = WPA_GET_BE16(mic + mic_len);
2172 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2173 sizeof(*key) - mic_len - 2)
2174 return;
2175
2176 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2177 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2178 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2179 return;
2180 }
2181 if (kde.rsn_ie) {
2182 eapol_key_ie = kde.rsn_ie;
2183 eapol_key_ie_len = kde.rsn_ie_len;
2184 } else if (kde.osen) {
2185 eapol_key_ie = kde.osen;
2186 eapol_key_ie_len = kde.osen_len;
2187 } else {
2188 eapol_key_ie = kde.wpa_ie;
2189 eapol_key_ie_len = kde.wpa_ie_len;
2190 }
2191 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2192 if (sm->wpa_ie == NULL ||
2193 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2194 eapol_key_ie, eapol_key_ie_len)) {
2195 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2196 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2197 if (sm->wpa_ie) {
2198 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2199 sm->wpa_ie, sm->wpa_ie_len);
2200 }
2201 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2202 eapol_key_ie, eapol_key_ie_len);
2203 /* MLME-DEAUTHENTICATE.request */
2204 wpa_sta_disconnect(wpa_auth, sm->addr);
2205 return;
2206 }
2207 #ifdef CONFIG_IEEE80211R
2208 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2209 wpa_sta_disconnect(wpa_auth, sm->addr);
2210 return;
2211 }
2212 #endif /* CONFIG_IEEE80211R */
2213 #ifdef CONFIG_P2P
2214 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2215 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2216 int idx;
2217 wpa_printf(MSG_DEBUG,
2218 "P2P: IP address requested in EAPOL-Key exchange");
2219 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2220 if (idx >= 0) {
2221 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2222 bitfield_set(wpa_auth->ip_pool, idx);
2223 WPA_PUT_BE32(sm->ip_addr, start + idx);
2224 wpa_printf(MSG_DEBUG,
2225 "P2P: Assigned IP address %u.%u.%u.%u to "
2226 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2227 sm->ip_addr[2], sm->ip_addr[3],
2228 MAC2STR(sm->addr));
2229 }
2230 }
2231 #endif /* CONFIG_P2P */
2232
2233 #ifdef CONFIG_IEEE80211R
2234 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2235 /*
2236 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2237 * with the value we derived.
2238 */
2239 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2240 WPA_PMK_NAME_LEN) != 0) {
2241 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2242 "PMKR1Name mismatch in FT 4-way "
2243 "handshake");
2244 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2245 "Supplicant",
2246 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2247 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2248 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2249 return;
2250 }
2251 }
2252 #endif /* CONFIG_IEEE80211R */
2253
2254 sm->pending_1_of_4_timeout = 0;
2255 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2256
2257 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2258 /* PSK may have changed from the previous choice, so update
2259 * state machine data based on whatever PSK was selected here.
2260 */
2261 os_memcpy(sm->PMK, pmk, PMK_LEN);
2262 sm->pmk_len = PMK_LEN;
2263 }
2264
2265 sm->MICVerified = TRUE;
2266
2267 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2268 sm->PTK_valid = TRUE;
2269 }
2270
2271
2272 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2273 {
2274 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2275 sm->TimeoutCtr = 0;
2276 }
2277
2278
2279 #ifdef CONFIG_IEEE80211W
2280
2281 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2282 {
2283 if (sm->mgmt_frame_prot) {
2284 size_t len;
2285 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2286 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2287 }
2288
2289 return 0;
2290 }
2291
2292
2293 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2294 {
2295 struct wpa_igtk_kde igtk;
2296 struct wpa_group *gsm = sm->group;
2297 u8 rsc[WPA_KEY_RSC_LEN];
2298 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2299
2300 if (!sm->mgmt_frame_prot)
2301 return pos;
2302
2303 igtk.keyid[0] = gsm->GN_igtk;
2304 igtk.keyid[1] = 0;
2305 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
2306 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
2307 os_memset(igtk.pn, 0, sizeof(igtk.pn));
2308 else
2309 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
2310 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
2311 if (sm->wpa_auth->conf.disable_gtk) {
2312 /*
2313 * Provide unique random IGTK to each STA to prevent use of
2314 * IGTK in the BSS.
2315 */
2316 if (random_get_bytes(igtk.igtk, len) < 0)
2317 return pos;
2318 }
2319 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
2320 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
2321 NULL, 0);
2322
2323 return pos;
2324 }
2325
2326 #else /* CONFIG_IEEE80211W */
2327
2328 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2329 {
2330 return 0;
2331 }
2332
2333
2334 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2335 {
2336 return pos;
2337 }
2338
2339 #endif /* CONFIG_IEEE80211W */
2340
2341
2342 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
2343 {
2344 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
2345 size_t gtk_len, kde_len;
2346 struct wpa_group *gsm = sm->group;
2347 u8 *wpa_ie;
2348 int wpa_ie_len, secure, keyidx, encr = 0;
2349
2350 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
2351 sm->TimeoutEvt = FALSE;
2352
2353 sm->TimeoutCtr++;
2354 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
2355 /* No point in sending the EAPOL-Key - we will disconnect
2356 * immediately following this. */
2357 return;
2358 }
2359
2360 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2361 GTK[GN], IGTK, [FTIE], [TIE * 2])
2362 */
2363 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2364 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2365 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2366 wpa_ie = sm->wpa_auth->wpa_ie;
2367 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2368 if (sm->wpa == WPA_VERSION_WPA &&
2369 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2370 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2371 /* WPA-only STA, remove RSN IE and possible MDIE */
2372 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2373 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
2374 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2375 wpa_ie_len = wpa_ie[1] + 2;
2376 }
2377 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2378 "sending 3/4 msg of 4-Way Handshake");
2379 if (sm->wpa == WPA_VERSION_WPA2) {
2380 /* WPA2 send GTK in the 4-way handshake */
2381 secure = 1;
2382 gtk = gsm->GTK[gsm->GN - 1];
2383 gtk_len = gsm->GTK_len;
2384 if (sm->wpa_auth->conf.disable_gtk) {
2385 /*
2386 * Provide unique random GTK to each STA to prevent use
2387 * of GTK in the BSS.
2388 */
2389 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2390 return;
2391 gtk = dummy_gtk;
2392 }
2393 keyidx = gsm->GN;
2394 _rsc = rsc;
2395 encr = 1;
2396 } else {
2397 /* WPA does not include GTK in msg 3/4 */
2398 secure = 0;
2399 gtk = NULL;
2400 gtk_len = 0;
2401 keyidx = 0;
2402 _rsc = NULL;
2403 if (sm->rx_eapol_key_secure) {
2404 /*
2405 * It looks like Windows 7 supplicant tries to use
2406 * Secure bit in msg 2/4 after having reported Michael
2407 * MIC failure and it then rejects the 4-way handshake
2408 * if msg 3/4 does not set Secure bit. Work around this
2409 * by setting the Secure bit here even in the case of
2410 * WPA if the supplicant used it first.
2411 */
2412 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2413 "STA used Secure bit in WPA msg 2/4 - "
2414 "set Secure for 3/4 as workaround");
2415 secure = 1;
2416 }
2417 }
2418
2419 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2420 if (gtk)
2421 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2422 #ifdef CONFIG_IEEE80211R
2423 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2424 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2425 kde_len += 300; /* FTIE + 2 * TIE */
2426 }
2427 #endif /* CONFIG_IEEE80211R */
2428 #ifdef CONFIG_P2P
2429 if (WPA_GET_BE32(sm->ip_addr) > 0)
2430 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2431 #endif /* CONFIG_P2P */
2432 kde = os_malloc(kde_len);
2433 if (kde == NULL)
2434 return;
2435
2436 pos = kde;
2437 os_memcpy(pos, wpa_ie, wpa_ie_len);
2438 pos += wpa_ie_len;
2439 #ifdef CONFIG_IEEE80211R
2440 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2441 int res;
2442 size_t elen;
2443
2444 elen = pos - kde;
2445 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
2446 if (res < 0) {
2447 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2448 "PMKR1Name into RSN IE in EAPOL-Key data");
2449 os_free(kde);
2450 return;
2451 }
2452 pos -= wpa_ie_len;
2453 pos += elen;
2454 }
2455 #endif /* CONFIG_IEEE80211R */
2456 if (gtk) {
2457 u8 hdr[2];
2458 hdr[0] = keyidx & 0x03;
2459 hdr[1] = 0;
2460 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2461 gtk, gtk_len);
2462 }
2463 pos = ieee80211w_kde_add(sm, pos);
2464
2465 #ifdef CONFIG_IEEE80211R
2466 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2467 int res;
2468 struct wpa_auth_config *conf;
2469
2470 conf = &sm->wpa_auth->conf;
2471 if (sm->assoc_resp_ftie &&
2472 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
2473 os_memcpy(pos, sm->assoc_resp_ftie,
2474 2 + sm->assoc_resp_ftie[1]);
2475 res = 2 + sm->assoc_resp_ftie[1];
2476 } else {
2477 res = wpa_write_ftie(conf, conf->r0_key_holder,
2478 conf->r0_key_holder_len,
2479 NULL, NULL, pos,
2480 kde + kde_len - pos,
2481 NULL, 0);
2482 }
2483 if (res < 0) {
2484 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2485 "into EAPOL-Key Key Data");
2486 os_free(kde);
2487 return;
2488 }
2489 pos += res;
2490
2491 /* TIE[ReassociationDeadline] (TU) */
2492 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2493 *pos++ = 5;
2494 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2495 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2496 pos += 4;
2497
2498 /* TIE[KeyLifetime] (seconds) */
2499 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2500 *pos++ = 5;
2501 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2502 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2503 pos += 4;
2504 }
2505 #endif /* CONFIG_IEEE80211R */
2506 #ifdef CONFIG_P2P
2507 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2508 u8 addr[3 * 4];
2509 os_memcpy(addr, sm->ip_addr, 4);
2510 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2511 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2512 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2513 addr, sizeof(addr), NULL, 0);
2514 }
2515 #endif /* CONFIG_P2P */
2516
2517 wpa_send_eapol(sm->wpa_auth, sm,
2518 (secure ? WPA_KEY_INFO_SECURE : 0) |
2519 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
2520 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2521 WPA_KEY_INFO_KEY_TYPE,
2522 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2523 os_free(kde);
2524 }
2525
2526
2527 SM_STATE(WPA_PTK, PTKINITDONE)
2528 {
2529 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2530 sm->EAPOLKeyReceived = FALSE;
2531 if (sm->Pair) {
2532 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2533 int klen = wpa_cipher_key_len(sm->pairwise);
2534 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2535 sm->PTK.tk, klen)) {
2536 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2537 return;
2538 }
2539 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2540 sm->pairwise_set = TRUE;
2541
2542 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2543 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2544 eloop_register_timeout(sm->wpa_auth->conf.
2545 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2546 sm->wpa_auth, sm);
2547 }
2548
2549 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2550 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2551 WPA_EAPOL_authorized, 1);
2552 }
2553 }
2554
2555 if (0 /* IBSS == TRUE */) {
2556 sm->keycount++;
2557 if (sm->keycount == 2) {
2558 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2559 WPA_EAPOL_portValid, 1);
2560 }
2561 } else {
2562 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2563 1);
2564 }
2565 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2566 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2567 if (sm->wpa == WPA_VERSION_WPA)
2568 sm->PInitAKeys = TRUE;
2569 else
2570 sm->has_GTK = TRUE;
2571 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2572 "pairwise key handshake completed (%s)",
2573 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2574
2575 #ifdef CONFIG_IEEE80211R
2576 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2577 #endif /* CONFIG_IEEE80211R */
2578 }
2579
2580
2581 SM_STEP(WPA_PTK)
2582 {
2583 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2584
2585 if (sm->Init)
2586 SM_ENTER(WPA_PTK, INITIALIZE);
2587 else if (sm->Disconnect
2588 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2589 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2590 "WPA_PTK: sm->Disconnect");
2591 SM_ENTER(WPA_PTK, DISCONNECT);
2592 }
2593 else if (sm->DeauthenticationRequest)
2594 SM_ENTER(WPA_PTK, DISCONNECTED);
2595 else if (sm->AuthenticationRequest)
2596 SM_ENTER(WPA_PTK, AUTHENTICATION);
2597 else if (sm->ReAuthenticationRequest)
2598 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2599 else if (sm->PTKRequest)
2600 SM_ENTER(WPA_PTK, PTKSTART);
2601 else switch (sm->wpa_ptk_state) {
2602 case WPA_PTK_INITIALIZE:
2603 break;
2604 case WPA_PTK_DISCONNECT:
2605 SM_ENTER(WPA_PTK, DISCONNECTED);
2606 break;
2607 case WPA_PTK_DISCONNECTED:
2608 SM_ENTER(WPA_PTK, INITIALIZE);
2609 break;
2610 case WPA_PTK_AUTHENTICATION:
2611 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2612 break;
2613 case WPA_PTK_AUTHENTICATION2:
2614 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2615 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2616 WPA_EAPOL_keyRun) > 0)
2617 SM_ENTER(WPA_PTK, INITPMK);
2618 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2619 /* FIX: && 802.1X::keyRun */)
2620 SM_ENTER(WPA_PTK, INITPSK);
2621 break;
2622 case WPA_PTK_INITPMK:
2623 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2624 WPA_EAPOL_keyAvailable) > 0)
2625 SM_ENTER(WPA_PTK, PTKSTART);
2626 else {
2627 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2628 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2629 "INITPMK - keyAvailable = false");
2630 SM_ENTER(WPA_PTK, DISCONNECT);
2631 }
2632 break;
2633 case WPA_PTK_INITPSK:
2634 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2635 NULL))
2636 SM_ENTER(WPA_PTK, PTKSTART);
2637 else {
2638 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2639 "no PSK configured for the STA");
2640 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2641 SM_ENTER(WPA_PTK, DISCONNECT);
2642 }
2643 break;
2644 case WPA_PTK_PTKSTART:
2645 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2646 sm->EAPOLKeyPairwise)
2647 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2648 else if (sm->TimeoutCtr >
2649 (int) dot11RSNAConfigPairwiseUpdateCount) {
2650 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2651 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2652 "PTKSTART: Retry limit %d reached",
2653 dot11RSNAConfigPairwiseUpdateCount);
2654 SM_ENTER(WPA_PTK, DISCONNECT);
2655 } else if (sm->TimeoutEvt)
2656 SM_ENTER(WPA_PTK, PTKSTART);
2657 break;
2658 case WPA_PTK_PTKCALCNEGOTIATING:
2659 if (sm->MICVerified)
2660 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2661 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2662 sm->EAPOLKeyPairwise)
2663 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2664 else if (sm->TimeoutEvt)
2665 SM_ENTER(WPA_PTK, PTKSTART);
2666 break;
2667 case WPA_PTK_PTKCALCNEGOTIATING2:
2668 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2669 break;
2670 case WPA_PTK_PTKINITNEGOTIATING:
2671 if (sm->update_snonce)
2672 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2673 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2674 sm->EAPOLKeyPairwise && sm->MICVerified)
2675 SM_ENTER(WPA_PTK, PTKINITDONE);
2676 else if (sm->TimeoutCtr >
2677 (int) dot11RSNAConfigPairwiseUpdateCount) {
2678 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2679 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2680 "PTKINITNEGOTIATING: Retry limit %d "
2681 "reached",
2682 dot11RSNAConfigPairwiseUpdateCount);
2683 SM_ENTER(WPA_PTK, DISCONNECT);
2684 } else if (sm->TimeoutEvt)
2685 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2686 break;
2687 case WPA_PTK_PTKINITDONE:
2688 break;
2689 }
2690 }
2691
2692
2693 SM_STATE(WPA_PTK_GROUP, IDLE)
2694 {
2695 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2696 if (sm->Init) {
2697 /* Init flag is not cleared here, so avoid busy
2698 * loop by claiming nothing changed. */
2699 sm->changed = FALSE;
2700 }
2701 sm->GTimeoutCtr = 0;
2702 }
2703
2704
2705 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2706 {
2707 u8 rsc[WPA_KEY_RSC_LEN];
2708 struct wpa_group *gsm = sm->group;
2709 const u8 *kde;
2710 u8 *kde_buf = NULL, *pos, hdr[2];
2711 size_t kde_len;
2712 u8 *gtk, dummy_gtk[32];
2713
2714 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2715
2716 sm->GTimeoutCtr++;
2717 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2718 /* No point in sending the EAPOL-Key - we will disconnect
2719 * immediately following this. */
2720 return;
2721 }
2722
2723 if (sm->wpa == WPA_VERSION_WPA)
2724 sm->PInitAKeys = FALSE;
2725 sm->TimeoutEvt = FALSE;
2726 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2727 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2728 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2729 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2730 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2731 "sending 1/2 msg of Group Key Handshake");
2732
2733 gtk = gsm->GTK[gsm->GN - 1];
2734 if (sm->wpa_auth->conf.disable_gtk) {
2735 /*
2736 * Provide unique random GTK to each STA to prevent use
2737 * of GTK in the BSS.
2738 */
2739 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2740 return;
2741 gtk = dummy_gtk;
2742 }
2743 if (sm->wpa == WPA_VERSION_WPA2) {
2744 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2745 ieee80211w_kde_len(sm);
2746 kde_buf = os_malloc(kde_len);
2747 if (kde_buf == NULL)
2748 return;
2749
2750 kde = pos = kde_buf;
2751 hdr[0] = gsm->GN & 0x03;
2752 hdr[1] = 0;
2753 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2754 gtk, gsm->GTK_len);
2755 pos = ieee80211w_kde_add(sm, pos);
2756 kde_len = pos - kde;
2757 } else {
2758 kde = gtk;
2759 kde_len = gsm->GTK_len;
2760 }
2761
2762 wpa_send_eapol(sm->wpa_auth, sm,
2763 WPA_KEY_INFO_SECURE |
2764 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
2765 WPA_KEY_INFO_ACK |
2766 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2767 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1);
2768
2769 os_free(kde_buf);
2770 }
2771
2772
2773 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2774 {
2775 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2776 sm->EAPOLKeyReceived = FALSE;
2777 if (sm->GUpdateStationKeys)
2778 sm->group->GKeyDoneStations--;
2779 sm->GUpdateStationKeys = FALSE;
2780 sm->GTimeoutCtr = 0;
2781 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2782 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2783 "group key handshake completed (%s)",
2784 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2785 sm->has_GTK = TRUE;
2786 }
2787
2788
2789 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2790 {
2791 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2792 if (sm->GUpdateStationKeys)
2793 sm->group->GKeyDoneStations--;
2794 sm->GUpdateStationKeys = FALSE;
2795 sm->Disconnect = TRUE;
2796 }
2797
2798
2799 SM_STEP(WPA_PTK_GROUP)
2800 {
2801 if (sm->Init || sm->PtkGroupInit) {
2802 SM_ENTER(WPA_PTK_GROUP, IDLE);
2803 sm->PtkGroupInit = FALSE;
2804 } else switch (sm->wpa_ptk_group_state) {
2805 case WPA_PTK_GROUP_IDLE:
2806 if (sm->GUpdateStationKeys ||
2807 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2808 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2809 break;
2810 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2811 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2812 !sm->EAPOLKeyPairwise && sm->MICVerified)
2813 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2814 else if (sm->GTimeoutCtr >
2815 (int) dot11RSNAConfigGroupUpdateCount)
2816 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2817 else if (sm->TimeoutEvt)
2818 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2819 break;
2820 case WPA_PTK_GROUP_KEYERROR:
2821 SM_ENTER(WPA_PTK_GROUP, IDLE);
2822 break;
2823 case WPA_PTK_GROUP_REKEYESTABLISHED:
2824 SM_ENTER(WPA_PTK_GROUP, IDLE);
2825 break;
2826 }
2827 }
2828
2829
2830 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2831 struct wpa_group *group)
2832 {
2833 int ret = 0;
2834
2835 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2836 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2837 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2838 wpa_auth->addr, group->GNonce,
2839 group->GTK[group->GN - 1], group->GTK_len) < 0)
2840 ret = -1;
2841 wpa_hexdump_key(MSG_DEBUG, "GTK",
2842 group->GTK[group->GN - 1], group->GTK_len);
2843
2844 #ifdef CONFIG_IEEE80211W
2845 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2846 size_t len;
2847 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2848 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2849 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2850 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2851 wpa_auth->addr, group->GNonce,
2852 group->IGTK[group->GN_igtk - 4], len) < 0)
2853 ret = -1;
2854 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2855 group->IGTK[group->GN_igtk - 4], len);
2856 }
2857 #endif /* CONFIG_IEEE80211W */
2858
2859 return ret;
2860 }
2861
2862
2863 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2864 struct wpa_group *group)
2865 {
2866 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2867 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2868 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2869 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2870
2871 /* GTK[0..N] = 0 */
2872 os_memset(group->GTK, 0, sizeof(group->GTK));
2873 group->GN = 1;
2874 group->GM = 2;
2875 #ifdef CONFIG_IEEE80211W
2876 group->GN_igtk = 4;
2877 group->GM_igtk = 5;
2878 #endif /* CONFIG_IEEE80211W */
2879 /* GTK[GN] = CalcGTK() */
2880 wpa_gtk_update(wpa_auth, group);
2881 }
2882
2883
2884 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2885 {
2886 if (ctx != NULL && ctx != sm->group)
2887 return 0;
2888
2889 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2890 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2891 "Not in PTKINITDONE; skip Group Key update");
2892 sm->GUpdateStationKeys = FALSE;
2893 return 0;
2894 }
2895 if (sm->GUpdateStationKeys) {
2896 /*
2897 * This should not really happen, so add a debug log entry.
2898 * Since we clear the GKeyDoneStations before the loop, the
2899 * station needs to be counted here anyway.
2900 */
2901 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2902 "GUpdateStationKeys was already set when "
2903 "marking station for GTK rekeying");
2904 }
2905
2906 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2907 if (sm->is_wnmsleep)
2908 return 0;
2909
2910 sm->group->GKeyDoneStations++;
2911 sm->GUpdateStationKeys = TRUE;
2912
2913 wpa_sm_step(sm);
2914 return 0;
2915 }
2916
2917
2918 #ifdef CONFIG_WNM
2919 /* update GTK when exiting WNM-Sleep Mode */
2920 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2921 {
2922 if (sm == NULL || sm->is_wnmsleep)
2923 return;
2924
2925 wpa_group_update_sta(sm, NULL);
2926 }
2927
2928
2929 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2930 {
2931 if (sm)
2932 sm->is_wnmsleep = !!flag;
2933 }
2934
2935
2936 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2937 {
2938 struct wpa_group *gsm = sm->group;
2939 u8 *start = pos;
2940
2941 /*
2942 * GTK subelement:
2943 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2944 * Key[5..32]
2945 */
2946 *pos++ = WNM_SLEEP_SUBELEM_GTK;
2947 *pos++ = 11 + gsm->GTK_len;
2948 /* Key ID in B0-B1 of Key Info */
2949 WPA_PUT_LE16(pos, gsm->GN & 0x03);
2950 pos += 2;
2951 *pos++ = gsm->GTK_len;
2952 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2953 return 0;
2954 pos += 8;
2955 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2956 pos += gsm->GTK_len;
2957
2958 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2959 gsm->GN);
2960 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2961 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2962
2963 return pos - start;
2964 }
2965
2966
2967 #ifdef CONFIG_IEEE80211W
2968 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2969 {
2970 struct wpa_group *gsm = sm->group;
2971 u8 *start = pos;
2972 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2973
2974 /*
2975 * IGTK subelement:
2976 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2977 */
2978 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2979 *pos++ = 2 + 6 + len;
2980 WPA_PUT_LE16(pos, gsm->GN_igtk);
2981 pos += 2;
2982 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2983 return 0;
2984 pos += 6;
2985
2986 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
2987 pos += len;
2988
2989 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2990 gsm->GN_igtk);
2991 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2992 gsm->IGTK[gsm->GN_igtk - 4], len);
2993
2994 return pos - start;
2995 }
2996 #endif /* CONFIG_IEEE80211W */
2997 #endif /* CONFIG_WNM */
2998
2999
3000 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3001 struct wpa_group *group)
3002 {
3003 int tmp;
3004
3005 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3006 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3007 group->changed = TRUE;
3008 group->wpa_group_state = WPA_GROUP_SETKEYS;
3009 group->GTKReKey = FALSE;
3010 tmp = group->GM;
3011 group->GM = group->GN;
3012 group->GN = tmp;
3013 #ifdef CONFIG_IEEE80211W
3014 tmp = group->GM_igtk;
3015 group->GM_igtk = group->GN_igtk;
3016 group->GN_igtk = tmp;
3017 #endif /* CONFIG_IEEE80211W */
3018 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3019 * counting the STAs that are marked with GUpdateStationKeys instead of
3020 * including all STAs that could be in not-yet-completed state. */
3021 wpa_gtk_update(wpa_auth, group);
3022
3023 if (group->GKeyDoneStations) {
3024 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3025 "GKeyDoneStations=%d when starting new GTK rekey",
3026 group->GKeyDoneStations);
3027 group->GKeyDoneStations = 0;
3028 }
3029 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3030 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3031 group->GKeyDoneStations);
3032 }
3033
3034
3035 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3036 struct wpa_group *group)
3037 {
3038 int ret = 0;
3039
3040 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3041 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3042 broadcast_ether_addr, group->GN,
3043 group->GTK[group->GN - 1], group->GTK_len) < 0)
3044 ret = -1;
3045
3046 #ifdef CONFIG_IEEE80211W
3047 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3048 enum wpa_alg alg;
3049 size_t len;
3050
3051 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3052 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3053
3054 if (ret == 0 &&
3055 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3056 broadcast_ether_addr, group->GN_igtk,
3057 group->IGTK[group->GN_igtk - 4], len) < 0)
3058 ret = -1;
3059 }
3060 #endif /* CONFIG_IEEE80211W */
3061
3062 return ret;
3063 }
3064
3065
3066 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3067 {
3068 if (sm->group == ctx) {
3069 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3070 " for discconnection due to fatal failure",
3071 MAC2STR(sm->addr));
3072 sm->Disconnect = TRUE;
3073 }
3074
3075 return 0;
3076 }
3077
3078
3079 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3080 struct wpa_group *group)
3081 {
3082 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3083 group->changed = TRUE;
3084 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3085 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3086 }
3087
3088
3089 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3090 struct wpa_group *group)
3091 {
3092 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3093 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3094 group->changed = TRUE;
3095 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
3096
3097 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
3098 wpa_group_fatal_failure(wpa_auth, group);
3099 return -1;
3100 }
3101
3102 return 0;
3103 }
3104
3105
3106 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
3107 struct wpa_group *group)
3108 {
3109 if (group->GInit) {
3110 wpa_group_gtk_init(wpa_auth, group);
3111 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
3112 /* Do not allow group operations */
3113 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
3114 group->GTKAuthenticator) {
3115 wpa_group_setkeysdone(wpa_auth, group);
3116 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
3117 group->GTKReKey) {
3118 wpa_group_setkeys(wpa_auth, group);
3119 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
3120 if (group->GKeyDoneStations == 0)
3121 wpa_group_setkeysdone(wpa_auth, group);
3122 else if (group->GTKReKey)
3123 wpa_group_setkeys(wpa_auth, group);
3124 }
3125 }
3126
3127
3128 static int wpa_sm_step(struct wpa_state_machine *sm)
3129 {
3130 if (sm == NULL)
3131 return 0;
3132
3133 if (sm->in_step_loop) {
3134 /* This should not happen, but if it does, make sure we do not
3135 * end up freeing the state machine too early by exiting the
3136 * recursive call. */
3137 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
3138 return 0;
3139 }
3140
3141 sm->in_step_loop = 1;
3142 do {
3143 if (sm->pending_deinit)
3144 break;
3145
3146 sm->changed = FALSE;
3147 sm->wpa_auth->group->changed = FALSE;
3148
3149 SM_STEP_RUN(WPA_PTK);
3150 if (sm->pending_deinit)
3151 break;
3152 SM_STEP_RUN(WPA_PTK_GROUP);
3153 if (sm->pending_deinit)
3154 break;
3155 wpa_group_sm_step(sm->wpa_auth, sm->group);
3156 } while (sm->changed || sm->wpa_auth->group->changed);
3157 sm->in_step_loop = 0;
3158
3159 if (sm->pending_deinit) {
3160 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
3161 "machine deinit for " MACSTR, MAC2STR(sm->addr));
3162 wpa_free_sta_sm(sm);
3163 return 1;
3164 }
3165 return 0;
3166 }
3167
3168
3169 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
3170 {
3171 struct wpa_state_machine *sm = eloop_ctx;
3172 wpa_sm_step(sm);
3173 }
3174
3175
3176 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
3177 {
3178 if (sm == NULL)
3179 return;
3180 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
3181 }
3182
3183
3184 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
3185 {
3186 int tmp, i;
3187 struct wpa_group *group;
3188
3189 if (wpa_auth == NULL)
3190 return;
3191
3192 group = wpa_auth->group;
3193
3194 for (i = 0; i < 2; i++) {
3195 tmp = group->GM;
3196 group->GM = group->GN;
3197 group->GN = tmp;
3198 #ifdef CONFIG_IEEE80211W
3199 tmp = group->GM_igtk;
3200 group->GM_igtk = group->GN_igtk;
3201 group->GN_igtk = tmp;
3202 #endif /* CONFIG_IEEE80211W */
3203 wpa_gtk_update(wpa_auth, group);
3204 wpa_group_config_group_keys(wpa_auth, group);
3205 }
3206 }
3207
3208
3209 static const char * wpa_bool_txt(int val)
3210 {
3211 return val ? "TRUE" : "FALSE";
3212 }
3213
3214
3215 #define RSN_SUITE "%02x-%02x-%02x-%d"
3216 #define RSN_SUITE_ARG(s) \
3217 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
3218
3219 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
3220 {
3221 int len = 0, ret;
3222 char pmkid_txt[PMKID_LEN * 2 + 1];
3223 #ifdef CONFIG_RSN_PREAUTH
3224 const int preauth = 1;
3225 #else /* CONFIG_RSN_PREAUTH */
3226 const int preauth = 0;
3227 #endif /* CONFIG_RSN_PREAUTH */
3228
3229 if (wpa_auth == NULL)
3230 return len;
3231
3232 ret = os_snprintf(buf + len, buflen - len,
3233 "dot11RSNAOptionImplemented=TRUE\n"
3234 "dot11RSNAPreauthenticationImplemented=%s\n"
3235 "dot11RSNAEnabled=%s\n"
3236 "dot11RSNAPreauthenticationEnabled=%s\n",
3237 wpa_bool_txt(preauth),
3238 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
3239 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
3240 if (os_snprintf_error(buflen - len, ret))
3241 return len;
3242 len += ret;
3243
3244 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
3245 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
3246
3247 ret = os_snprintf(
3248 buf + len, buflen - len,
3249 "dot11RSNAConfigVersion=%u\n"
3250 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
3251 /* FIX: dot11RSNAConfigGroupCipher */
3252 /* FIX: dot11RSNAConfigGroupRekeyMethod */
3253 /* FIX: dot11RSNAConfigGroupRekeyTime */
3254 /* FIX: dot11RSNAConfigGroupRekeyPackets */
3255 "dot11RSNAConfigGroupRekeyStrict=%u\n"
3256 "dot11RSNAConfigGroupUpdateCount=%u\n"
3257 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
3258 "dot11RSNAConfigGroupCipherSize=%u\n"
3259 "dot11RSNAConfigPMKLifetime=%u\n"
3260 "dot11RSNAConfigPMKReauthThreshold=%u\n"
3261 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
3262 "dot11RSNAConfigSATimeout=%u\n"
3263 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
3264 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
3265 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
3266 "dot11RSNAPMKIDUsed=%s\n"
3267 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
3268 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
3269 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
3270 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
3271 "dot11RSNA4WayHandshakeFailures=%u\n"
3272 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
3273 RSN_VERSION,
3274 !!wpa_auth->conf.wpa_strict_rekey,
3275 dot11RSNAConfigGroupUpdateCount,
3276 dot11RSNAConfigPairwiseUpdateCount,
3277 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
3278 dot11RSNAConfigPMKLifetime,
3279 dot11RSNAConfigPMKReauthThreshold,
3280 dot11RSNAConfigSATimeout,
3281 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
3282 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
3283 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
3284 pmkid_txt,
3285 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
3286 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
3287 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
3288 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
3289 wpa_auth->dot11RSNA4WayHandshakeFailures);
3290 if (os_snprintf_error(buflen - len, ret))
3291 return len;
3292 len += ret;
3293
3294 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
3295 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
3296
3297 /* Private MIB */
3298 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
3299 wpa_auth->group->wpa_group_state);
3300 if (os_snprintf_error(buflen - len, ret))
3301 return len;
3302 len += ret;
3303
3304 return len;
3305 }
3306
3307
3308 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
3309 {
3310 int len = 0, ret;
3311 u32 pairwise = 0;
3312
3313 if (sm == NULL)
3314 return 0;
3315
3316 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
3317
3318 /* dot11RSNAStatsEntry */
3319
3320 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
3321 WPA_PROTO_RSN : WPA_PROTO_WPA,
3322 sm->pairwise);
3323 if (pairwise == 0)
3324 return 0;
3325
3326 ret = os_snprintf(
3327 buf + len, buflen - len,
3328 /* TODO: dot11RSNAStatsIndex */
3329 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
3330 "dot11RSNAStatsVersion=1\n"
3331 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
3332 /* TODO: dot11RSNAStatsTKIPICVErrors */
3333 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
3334 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
3335 /* TODO: dot11RSNAStatsCCMPReplays */
3336 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
3337 /* TODO: dot11RSNAStatsTKIPReplays */,
3338 MAC2STR(sm->addr),
3339 RSN_SUITE_ARG(pairwise),
3340 sm->dot11RSNAStatsTKIPLocalMICFailures,
3341 sm->dot11RSNAStatsTKIPRemoteMICFailures);
3342 if (os_snprintf_error(buflen - len, ret))
3343 return len;
3344 len += ret;
3345
3346 /* Private MIB */
3347 ret = os_snprintf(buf + len, buflen - len,
3348 "hostapdWPAPTKState=%d\n"
3349 "hostapdWPAPTKGroupState=%d\n",
3350 sm->wpa_ptk_state,
3351 sm->wpa_ptk_group_state);
3352 if (os_snprintf_error(buflen - len, ret))
3353 return len;
3354 len += ret;
3355
3356 return len;
3357 }
3358
3359
3360 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
3361 {
3362 if (wpa_auth)
3363 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
3364 }
3365
3366
3367 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
3368 {
3369 return sm && sm->pairwise_set;
3370 }
3371
3372
3373 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
3374 {
3375 return sm->pairwise;
3376 }
3377
3378
3379 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3380 {
3381 if (sm == NULL)
3382 return -1;
3383 return sm->wpa_key_mgmt;
3384 }
3385
3386
3387 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3388 {
3389 if (sm == NULL)
3390 return 0;
3391 return sm->wpa;
3392 }
3393
3394
3395 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3396 struct rsn_pmksa_cache_entry *entry)
3397 {
3398 if (sm == NULL || sm->pmksa != entry)
3399 return -1;
3400 sm->pmksa = NULL;
3401 return 0;
3402 }
3403
3404
3405 struct rsn_pmksa_cache_entry *
3406 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3407 {
3408 return sm ? sm->pmksa : NULL;
3409 }
3410
3411
3412 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3413 {
3414 if (sm)
3415 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3416 }
3417
3418
3419 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3420 {
3421 if (wpa_auth == NULL)
3422 return NULL;
3423 *len = wpa_auth->wpa_ie_len;
3424 return wpa_auth->wpa_ie;
3425 }
3426
3427
3428 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3429 unsigned int pmk_len,
3430 int session_timeout, struct eapol_state_machine *eapol)
3431 {
3432 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3433 sm->wpa_auth->conf.disable_pmksa_caching)
3434 return -1;
3435
3436 if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
3437 if (pmk_len > PMK_LEN_SUITE_B_192)
3438 pmk_len = PMK_LEN_SUITE_B_192;
3439 } else if (pmk_len > PMK_LEN) {
3440 pmk_len = PMK_LEN;
3441 }
3442
3443 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
3444 sm->PTK.kck, sm->PTK.kck_len,
3445 sm->wpa_auth->addr, sm->addr, session_timeout,
3446 eapol, sm->wpa_key_mgmt))
3447 return 0;
3448
3449 return -1;
3450 }
3451
3452
3453 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3454 const u8 *pmk, size_t len, const u8 *sta_addr,
3455 int session_timeout,
3456 struct eapol_state_machine *eapol)
3457 {
3458 if (wpa_auth == NULL)
3459 return -1;
3460
3461 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
3462 NULL, 0,
3463 wpa_auth->addr,
3464 sta_addr, session_timeout, eapol,
3465 WPA_KEY_MGMT_IEEE8021X))
3466 return 0;
3467
3468 return -1;
3469 }
3470
3471
3472 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
3473 const u8 *pmk, const u8 *pmkid)
3474 {
3475 if (wpa_auth->conf.disable_pmksa_caching)
3476 return -1;
3477
3478 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
3479 NULL, 0,
3480 wpa_auth->addr, addr, 0, NULL,
3481 WPA_KEY_MGMT_SAE))
3482 return 0;
3483
3484 return -1;
3485 }
3486
3487
3488 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3489 const u8 *sta_addr)
3490 {
3491 struct rsn_pmksa_cache_entry *pmksa;
3492
3493 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3494 return;
3495 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3496 if (pmksa) {
3497 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3498 MACSTR " based on request", MAC2STR(sta_addr));
3499 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3500 }
3501 }
3502
3503
3504 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
3505 size_t len)
3506 {
3507 if (!wpa_auth || !wpa_auth->pmksa)
3508 return 0;
3509 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
3510 }
3511
3512
3513 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
3514 {
3515 if (wpa_auth && wpa_auth->pmksa)
3516 pmksa_cache_auth_flush(wpa_auth->pmksa);
3517 }
3518
3519
3520 struct rsn_pmksa_cache_entry *
3521 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
3522 {
3523 if (!wpa_auth || !wpa_auth->pmksa)
3524 return NULL;
3525 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3526 }
3527
3528
3529 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
3530 struct wpa_state_machine *sm,
3531 struct wpa_authenticator *wpa_auth,
3532 u8 *pmkid, u8 *pmk)
3533 {
3534 if (!sm)
3535 return;
3536
3537 sm->pmksa = pmksa;
3538 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
3539 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
3540 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
3541 }
3542
3543
3544 /*
3545 * Remove and free the group from wpa_authenticator. This is triggered by a
3546 * callback to make sure nobody is currently iterating the group list while it
3547 * gets modified.
3548 */
3549 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
3550 struct wpa_group *group)
3551 {
3552 struct wpa_group *prev = wpa_auth->group;
3553
3554 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
3555 group->vlan_id);
3556
3557 while (prev) {
3558 if (prev->next == group) {
3559 /* This never frees the special first group as needed */
3560 prev->next = group->next;
3561 os_free(group);
3562 break;
3563 }
3564 prev = prev->next;
3565 }
3566
3567 }
3568
3569
3570 /* Increase the reference counter for group */
3571 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
3572 struct wpa_group *group)
3573 {
3574 /* Skip the special first group */
3575 if (wpa_auth->group == group)
3576 return;
3577
3578 group->references++;
3579 }
3580
3581
3582 /* Decrease the reference counter and maybe free the group */
3583 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
3584 struct wpa_group *group)
3585 {
3586 /* Skip the special first group */
3587 if (wpa_auth->group == group)
3588 return;
3589
3590 group->references--;
3591 if (group->references)
3592 return;
3593 wpa_group_free(wpa_auth, group);
3594 }
3595
3596
3597 /*
3598 * Add a group that has its references counter set to zero. Caller needs to
3599 * call wpa_group_get() on the return value to mark the entry in use.
3600 */
3601 static struct wpa_group *
3602 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3603 {
3604 struct wpa_group *group;
3605
3606 if (wpa_auth == NULL || wpa_auth->group == NULL)
3607 return NULL;
3608
3609 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3610 vlan_id);
3611 group = wpa_group_init(wpa_auth, vlan_id, 0);
3612 if (group == NULL)
3613 return NULL;
3614
3615 group->next = wpa_auth->group->next;
3616 wpa_auth->group->next = group;
3617
3618 return group;
3619 }
3620
3621
3622 /*
3623 * Enforce that the group state machine for the VLAN is running, increase
3624 * reference counter as interface is up. References might have been increased
3625 * even if a negative value is returned.
3626 * Returns: -1 on error (group missing, group already failed); otherwise, 0
3627 */
3628 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3629 {
3630 struct wpa_group *group;
3631
3632 if (wpa_auth == NULL)
3633 return 0;
3634
3635 group = wpa_auth->group;
3636 while (group) {
3637 if (group->vlan_id == vlan_id)
3638 break;
3639 group = group->next;
3640 }
3641
3642 if (group == NULL) {
3643 group = wpa_auth_add_group(wpa_auth, vlan_id);
3644 if (group == NULL)
3645 return -1;
3646 }
3647
3648 wpa_printf(MSG_DEBUG,
3649 "WPA: Ensure group state machine running for VLAN ID %d",
3650 vlan_id);
3651
3652 wpa_group_get(wpa_auth, group);
3653 group->num_setup_iface++;
3654
3655 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3656 return -1;
3657
3658 return 0;
3659 }
3660
3661
3662 /*
3663 * Decrease reference counter, expected to be zero afterwards.
3664 * returns: -1 on error (group not found, group in fail state)
3665 * -2 if wpa_group is still referenced
3666 * 0 else
3667 */
3668 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3669 {
3670 struct wpa_group *group;
3671 int ret = 0;
3672
3673 if (wpa_auth == NULL)
3674 return 0;
3675
3676 group = wpa_auth->group;
3677 while (group) {
3678 if (group->vlan_id == vlan_id)
3679 break;
3680 group = group->next;
3681 }
3682
3683 if (group == NULL)
3684 return -1;
3685
3686 wpa_printf(MSG_DEBUG,
3687 "WPA: Try stopping group state machine for VLAN ID %d",
3688 vlan_id);
3689
3690 if (group->num_setup_iface <= 0) {
3691 wpa_printf(MSG_ERROR,
3692 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
3693 vlan_id);
3694 return -1;
3695 }
3696 group->num_setup_iface--;
3697
3698 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3699 ret = -1;
3700
3701 if (group->references > 1) {
3702 wpa_printf(MSG_DEBUG,
3703 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
3704 vlan_id);
3705 ret = -2;
3706 }
3707
3708 wpa_group_put(wpa_auth, group);
3709
3710 return ret;
3711 }
3712
3713
3714 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3715 {
3716 struct wpa_group *group;
3717
3718 if (sm == NULL || sm->wpa_auth == NULL)
3719 return 0;
3720
3721 group = sm->wpa_auth->group;
3722 while (group) {
3723 if (group->vlan_id == vlan_id)
3724 break;
3725 group = group->next;
3726 }
3727
3728 if (group == NULL) {
3729 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3730 if (group == NULL)
3731 return -1;
3732 }
3733
3734 if (sm->group == group)
3735 return 0;
3736
3737 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3738 return -1;
3739
3740 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3741 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3742
3743 wpa_group_get(sm->wpa_auth, group);
3744 wpa_group_put(sm->wpa_auth, sm->group);
3745 sm->group = group;
3746
3747 return 0;
3748 }
3749
3750
3751 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3752 struct wpa_state_machine *sm, int ack)
3753 {
3754 if (wpa_auth == NULL || sm == NULL)
3755 return;
3756 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3757 " ack=%d", MAC2STR(sm->addr), ack);
3758 if (sm->pending_1_of_4_timeout && ack) {
3759 /*
3760 * Some deployed supplicant implementations update their SNonce
3761 * for each EAPOL-Key 2/4 message even within the same 4-way
3762 * handshake and then fail to use the first SNonce when
3763 * deriving the PTK. This results in unsuccessful 4-way
3764 * handshake whenever the relatively short initial timeout is
3765 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3766 * around this by increasing the timeout now that we know that
3767 * the station has received the frame.
3768 */
3769 int timeout_ms = eapol_key_timeout_subseq;
3770 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3771 "timeout by %u ms because of acknowledged frame",
3772 timeout_ms);
3773 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3774 eloop_register_timeout(timeout_ms / 1000,
3775 (timeout_ms % 1000) * 1000,
3776 wpa_send_eapol_timeout, wpa_auth, sm);
3777 }
3778 }
3779
3780
3781 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3782 {
3783 if (sm == NULL)
3784 return 0;
3785 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3786 }
3787
3788
3789 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3790 {
3791 if (sm == NULL)
3792 return 0;
3793 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3794 }
3795
3796
3797 #ifdef CONFIG_P2P
3798 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3799 {
3800 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3801 return -1;
3802 os_memcpy(addr, sm->ip_addr, 4);
3803 return 0;
3804 }
3805 #endif /* CONFIG_P2P */
3806
3807
3808 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
3809 struct radius_das_attrs *attr)
3810 {
3811 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
3812 }
3813
3814
3815 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
3816 {
3817 struct wpa_group *group;
3818
3819 if (!wpa_auth)
3820 return;
3821 for (group = wpa_auth->group; group; group = group->next)
3822 wpa_group_config_group_keys(wpa_auth, group);
3823 }
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