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[thirdparty/hostap.git] / src / ap / wpa_auth.c
1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2011, 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 "common/ieee802_11_defs.h"
15 #include "crypto/aes_wrap.h"
16 #include "crypto/crypto.h"
17 #include "crypto/sha1.h"
18 #include "crypto/sha256.h"
19 #include "crypto/random.h"
20 #include "eapol_auth/eapol_auth_sm.h"
21 #include "ap_config.h"
22 #include "ieee802_11.h"
23 #include "wpa_auth.h"
24 #include "pmksa_cache_auth.h"
25 #include "wpa_auth_i.h"
26 #include "wpa_auth_ie.h"
27
28 #define STATE_MACHINE_DATA struct wpa_state_machine
29 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
30 #define STATE_MACHINE_ADDR sm->addr
31
32
33 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
34 static int wpa_sm_step(struct wpa_state_machine *sm);
35 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
36 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
37 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
38 struct wpa_group *group);
39 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
40 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
41 struct wpa_group *group);
42 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
43 struct wpa_group *group);
44
45 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
46 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
47 static const u32 eapol_key_timeout_first = 100; /* ms */
48 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
49 static const u32 eapol_key_timeout_first_group = 500; /* ms */
50
51 /* TODO: make these configurable */
52 static const int dot11RSNAConfigPMKLifetime = 43200;
53 static const int dot11RSNAConfigPMKReauthThreshold = 70;
54 static const int dot11RSNAConfigSATimeout = 60;
55
56
57 static inline void wpa_auth_mic_failure_report(
58 struct wpa_authenticator *wpa_auth, const u8 *addr)
59 {
60 if (wpa_auth->cb.mic_failure_report)
61 wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
62 }
63
64
65 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
66 const u8 *addr, wpa_eapol_variable var,
67 int value)
68 {
69 if (wpa_auth->cb.set_eapol)
70 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
71 }
72
73
74 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
75 const u8 *addr, wpa_eapol_variable var)
76 {
77 if (wpa_auth->cb.get_eapol == NULL)
78 return -1;
79 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
80 }
81
82
83 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
84 const u8 *addr, const u8 *prev_psk)
85 {
86 if (wpa_auth->cb.get_psk == NULL)
87 return NULL;
88 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk);
89 }
90
91
92 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
93 const u8 *addr, u8 *msk, size_t *len)
94 {
95 if (wpa_auth->cb.get_msk == NULL)
96 return -1;
97 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
98 }
99
100
101 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
102 int vlan_id,
103 enum wpa_alg alg, const u8 *addr, int idx,
104 u8 *key, size_t key_len)
105 {
106 if (wpa_auth->cb.set_key == NULL)
107 return -1;
108 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
109 key, key_len);
110 }
111
112
113 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
114 const u8 *addr, int idx, u8 *seq)
115 {
116 if (wpa_auth->cb.get_seqnum == NULL)
117 return -1;
118 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
119 }
120
121
122 static inline int
123 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
124 const u8 *data, size_t data_len, int encrypt)
125 {
126 if (wpa_auth->cb.send_eapol == NULL)
127 return -1;
128 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
129 encrypt);
130 }
131
132
133 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
134 int (*cb)(struct wpa_state_machine *sm, void *ctx),
135 void *cb_ctx)
136 {
137 if (wpa_auth->cb.for_each_sta == NULL)
138 return 0;
139 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
140 }
141
142
143 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
144 int (*cb)(struct wpa_authenticator *a, void *ctx),
145 void *cb_ctx)
146 {
147 if (wpa_auth->cb.for_each_auth == NULL)
148 return 0;
149 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
150 }
151
152
153 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
154 logger_level level, const char *txt)
155 {
156 if (wpa_auth->cb.logger == NULL)
157 return;
158 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
159 }
160
161
162 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
163 logger_level level, const char *fmt, ...)
164 {
165 char *format;
166 int maxlen;
167 va_list ap;
168
169 if (wpa_auth->cb.logger == NULL)
170 return;
171
172 maxlen = os_strlen(fmt) + 100;
173 format = os_malloc(maxlen);
174 if (!format)
175 return;
176
177 va_start(ap, fmt);
178 vsnprintf(format, maxlen, fmt, ap);
179 va_end(ap);
180
181 wpa_auth_logger(wpa_auth, addr, level, format);
182
183 os_free(format);
184 }
185
186
187 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
188 const u8 *addr)
189 {
190 if (wpa_auth->cb.disconnect == NULL)
191 return;
192 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
193 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
194 WLAN_REASON_PREV_AUTH_NOT_VALID);
195 }
196
197
198 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
199 {
200 int ret = 0;
201 #ifdef CONFIG_IEEE80211R
202 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
203 ret = 1;
204 #endif /* CONFIG_IEEE80211R */
205 #ifdef CONFIG_IEEE80211W
206 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
207 ret = 1;
208 #endif /* CONFIG_IEEE80211W */
209 return ret;
210 }
211
212
213 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
214 {
215 struct wpa_authenticator *wpa_auth = eloop_ctx;
216
217 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
218 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
219 "initialization.");
220 } else {
221 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
222 wpa_hexdump_key(MSG_DEBUG, "GMK",
223 wpa_auth->group->GMK, WPA_GMK_LEN);
224 }
225
226 if (wpa_auth->conf.wpa_gmk_rekey) {
227 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
228 wpa_rekey_gmk, wpa_auth, NULL);
229 }
230 }
231
232
233 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
234 {
235 struct wpa_authenticator *wpa_auth = eloop_ctx;
236 struct wpa_group *group;
237
238 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
239 for (group = wpa_auth->group; group; group = group->next) {
240 group->GTKReKey = TRUE;
241 do {
242 group->changed = FALSE;
243 wpa_group_sm_step(wpa_auth, group);
244 } while (group->changed);
245 }
246
247 if (wpa_auth->conf.wpa_group_rekey) {
248 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
249 0, wpa_rekey_gtk, wpa_auth, NULL);
250 }
251 }
252
253
254 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
255 {
256 struct wpa_authenticator *wpa_auth = eloop_ctx;
257 struct wpa_state_machine *sm = timeout_ctx;
258
259 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
260 wpa_request_new_ptk(sm);
261 wpa_sm_step(sm);
262 }
263
264
265 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
266 {
267 if (sm->pmksa == ctx)
268 sm->pmksa = NULL;
269 return 0;
270 }
271
272
273 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
274 void *ctx)
275 {
276 struct wpa_authenticator *wpa_auth = ctx;
277 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
278 }
279
280
281 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
282 struct wpa_group *group)
283 {
284 u8 buf[ETH_ALEN + 8 + sizeof(group)];
285 u8 rkey[32];
286
287 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
288 return -1;
289 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
290
291 /*
292 * Counter = PRF-256(Random number, "Init Counter",
293 * Local MAC Address || Time)
294 */
295 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
296 wpa_get_ntp_timestamp(buf + ETH_ALEN);
297 os_memcpy(buf + ETH_ALEN + 8, &group, sizeof(group));
298 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
299 return -1;
300
301 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
302 group->Counter, WPA_NONCE_LEN) < 0)
303 return -1;
304 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
305 group->Counter, WPA_NONCE_LEN);
306
307 return 0;
308 }
309
310
311 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
312 int vlan_id, int delay_init)
313 {
314 struct wpa_group *group;
315
316 group = os_zalloc(sizeof(struct wpa_group));
317 if (group == NULL)
318 return NULL;
319
320 group->GTKAuthenticator = TRUE;
321 group->vlan_id = vlan_id;
322 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
323
324 if (random_pool_ready() != 1) {
325 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
326 "for secure operations - update keys later when "
327 "the first station connects");
328 }
329
330 /*
331 * Set initial GMK/Counter value here. The actual values that will be
332 * used in negotiations will be set once the first station tries to
333 * connect. This allows more time for collecting additional randomness
334 * on embedded devices.
335 */
336 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
337 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
338 "initialization.");
339 os_free(group);
340 return NULL;
341 }
342
343 group->GInit = TRUE;
344 if (delay_init) {
345 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
346 "until Beacon frames have been configured");
347 /* Initialization is completed in wpa_init_keys(). */
348 } else {
349 wpa_group_sm_step(wpa_auth, group);
350 group->GInit = FALSE;
351 wpa_group_sm_step(wpa_auth, group);
352 }
353
354 return group;
355 }
356
357
358 /**
359 * wpa_init - Initialize WPA authenticator
360 * @addr: Authenticator address
361 * @conf: Configuration for WPA authenticator
362 * @cb: Callback functions for WPA authenticator
363 * Returns: Pointer to WPA authenticator data or %NULL on failure
364 */
365 struct wpa_authenticator * wpa_init(const u8 *addr,
366 struct wpa_auth_config *conf,
367 struct wpa_auth_callbacks *cb)
368 {
369 struct wpa_authenticator *wpa_auth;
370
371 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
372 if (wpa_auth == NULL)
373 return NULL;
374 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
375 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
376 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
377
378 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
379 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
380 os_free(wpa_auth);
381 return NULL;
382 }
383
384 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
385 if (wpa_auth->group == NULL) {
386 os_free(wpa_auth->wpa_ie);
387 os_free(wpa_auth);
388 return NULL;
389 }
390
391 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
392 wpa_auth);
393 if (wpa_auth->pmksa == NULL) {
394 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
395 os_free(wpa_auth->wpa_ie);
396 os_free(wpa_auth);
397 return NULL;
398 }
399
400 #ifdef CONFIG_IEEE80211R
401 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
402 if (wpa_auth->ft_pmk_cache == NULL) {
403 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
404 os_free(wpa_auth->wpa_ie);
405 pmksa_cache_auth_deinit(wpa_auth->pmksa);
406 os_free(wpa_auth);
407 return NULL;
408 }
409 #endif /* CONFIG_IEEE80211R */
410
411 if (wpa_auth->conf.wpa_gmk_rekey) {
412 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
413 wpa_rekey_gmk, wpa_auth, NULL);
414 }
415
416 if (wpa_auth->conf.wpa_group_rekey) {
417 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
418 wpa_rekey_gtk, wpa_auth, NULL);
419 }
420
421 return wpa_auth;
422 }
423
424
425 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
426 {
427 struct wpa_group *group = wpa_auth->group;
428
429 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
430 "keys");
431 wpa_group_sm_step(wpa_auth, group);
432 group->GInit = FALSE;
433 wpa_group_sm_step(wpa_auth, group);
434 return 0;
435 }
436
437
438 /**
439 * wpa_deinit - Deinitialize WPA authenticator
440 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
441 */
442 void wpa_deinit(struct wpa_authenticator *wpa_auth)
443 {
444 struct wpa_group *group, *prev;
445
446 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
447 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
448
449 #ifdef CONFIG_PEERKEY
450 while (wpa_auth->stsl_negotiations)
451 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
452 #endif /* CONFIG_PEERKEY */
453
454 pmksa_cache_auth_deinit(wpa_auth->pmksa);
455
456 #ifdef CONFIG_IEEE80211R
457 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
458 wpa_auth->ft_pmk_cache = NULL;
459 #endif /* CONFIG_IEEE80211R */
460
461 os_free(wpa_auth->wpa_ie);
462
463 group = wpa_auth->group;
464 while (group) {
465 prev = group;
466 group = group->next;
467 os_free(prev);
468 }
469
470 os_free(wpa_auth);
471 }
472
473
474 /**
475 * wpa_reconfig - Update WPA authenticator configuration
476 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
477 * @conf: Configuration for WPA authenticator
478 */
479 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
480 struct wpa_auth_config *conf)
481 {
482 struct wpa_group *group;
483 if (wpa_auth == NULL)
484 return 0;
485
486 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
487 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
488 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
489 return -1;
490 }
491
492 /*
493 * Reinitialize GTK to make sure it is suitable for the new
494 * configuration.
495 */
496 group = wpa_auth->group;
497 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
498 group->GInit = TRUE;
499 wpa_group_sm_step(wpa_auth, group);
500 group->GInit = FALSE;
501 wpa_group_sm_step(wpa_auth, group);
502
503 return 0;
504 }
505
506
507 struct wpa_state_machine *
508 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr)
509 {
510 struct wpa_state_machine *sm;
511
512 sm = os_zalloc(sizeof(struct wpa_state_machine));
513 if (sm == NULL)
514 return NULL;
515 os_memcpy(sm->addr, addr, ETH_ALEN);
516
517 sm->wpa_auth = wpa_auth;
518 sm->group = wpa_auth->group;
519
520 return sm;
521 }
522
523
524 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
525 struct wpa_state_machine *sm)
526 {
527 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
528 return -1;
529
530 #ifdef CONFIG_IEEE80211R
531 if (sm->ft_completed) {
532 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
533 "FT authentication already completed - do not "
534 "start 4-way handshake");
535 return 0;
536 }
537 #endif /* CONFIG_IEEE80211R */
538
539 if (sm->started) {
540 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
541 sm->ReAuthenticationRequest = TRUE;
542 return wpa_sm_step(sm);
543 }
544
545 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
546 "start authentication");
547 sm->started = 1;
548
549 sm->Init = TRUE;
550 if (wpa_sm_step(sm) == 1)
551 return 1; /* should not really happen */
552 sm->Init = FALSE;
553 sm->AuthenticationRequest = TRUE;
554 return wpa_sm_step(sm);
555 }
556
557
558 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
559 {
560 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
561 * reassociates back to the same AP while the previous entry for the
562 * STA has not yet been removed. */
563 if (sm == NULL)
564 return;
565
566 sm->wpa_key_mgmt = 0;
567 }
568
569
570 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
571 {
572 if (sm->GUpdateStationKeys) {
573 sm->group->GKeyDoneStations--;
574 sm->GUpdateStationKeys = FALSE;
575 }
576 #ifdef CONFIG_IEEE80211R
577 os_free(sm->assoc_resp_ftie);
578 #endif /* CONFIG_IEEE80211R */
579 os_free(sm->last_rx_eapol_key);
580 os_free(sm->wpa_ie);
581 os_free(sm);
582 }
583
584
585 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
586 {
587 if (sm == NULL)
588 return;
589
590 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
591 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
592 "strict rekeying - force GTK rekey since STA "
593 "is leaving");
594 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
595 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
596 NULL);
597 }
598
599 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
600 sm->pending_1_of_4_timeout = 0;
601 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
602 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
603 if (sm->in_step_loop) {
604 /* Must not free state machine while wpa_sm_step() is running.
605 * Freeing will be completed in the end of wpa_sm_step(). */
606 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
607 "machine deinit for " MACSTR, MAC2STR(sm->addr));
608 sm->pending_deinit = 1;
609 } else
610 wpa_free_sta_sm(sm);
611 }
612
613
614 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
615 {
616 if (sm == NULL)
617 return;
618
619 sm->PTKRequest = TRUE;
620 sm->PTK_valid = 0;
621 }
622
623
624 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
625 const u8 *replay_counter)
626 {
627 int i;
628 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
629 if (!ctr[i].valid)
630 break;
631 if (os_memcmp(replay_counter, ctr[i].counter,
632 WPA_REPLAY_COUNTER_LEN) == 0)
633 return 1;
634 }
635 return 0;
636 }
637
638
639 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
640 const u8 *replay_counter)
641 {
642 int i;
643 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
644 if (ctr[i].valid &&
645 (replay_counter == NULL ||
646 os_memcmp(replay_counter, ctr[i].counter,
647 WPA_REPLAY_COUNTER_LEN) == 0))
648 ctr[i].valid = FALSE;
649 }
650 }
651
652
653 #ifdef CONFIG_IEEE80211R
654 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
655 struct wpa_state_machine *sm,
656 struct wpa_eapol_ie_parse *kde)
657 {
658 struct wpa_ie_data ie;
659 struct rsn_mdie *mdie;
660
661 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
662 ie.num_pmkid != 1 || ie.pmkid == NULL) {
663 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
664 "FT 4-way handshake message 2/4");
665 return -1;
666 }
667
668 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
669 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
670 sm->sup_pmk_r1_name, PMKID_LEN);
671
672 if (!kde->mdie || !kde->ftie) {
673 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
674 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
675 return -1;
676 }
677
678 mdie = (struct rsn_mdie *) (kde->mdie + 2);
679 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
680 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
681 MOBILITY_DOMAIN_ID_LEN) != 0) {
682 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
683 return -1;
684 }
685
686 if (sm->assoc_resp_ftie &&
687 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
688 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
689 2 + sm->assoc_resp_ftie[1]) != 0)) {
690 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
691 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
692 kde->ftie, kde->ftie_len);
693 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
694 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
695 return -1;
696 }
697
698 return 0;
699 }
700 #endif /* CONFIG_IEEE80211R */
701
702
703 static void wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
704 struct wpa_state_machine *sm, int group)
705 {
706 /* Supplicant reported a Michael MIC error */
707 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
708 "received EAPOL-Key Error Request "
709 "(STA detected Michael MIC failure (group=%d))",
710 group);
711
712 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
713 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
714 "ignore Michael MIC failure report since "
715 "group cipher is not TKIP");
716 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
717 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
718 "ignore Michael MIC failure report since "
719 "pairwise cipher is not TKIP");
720 } else {
721 wpa_auth_mic_failure_report(wpa_auth, sm->addr);
722 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
723 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
724 }
725
726 /*
727 * Error report is not a request for a new key handshake, but since
728 * Authenticator may do it, let's change the keys now anyway.
729 */
730 wpa_request_new_ptk(sm);
731 }
732
733
734 void wpa_receive(struct wpa_authenticator *wpa_auth,
735 struct wpa_state_machine *sm,
736 u8 *data, size_t data_len)
737 {
738 struct ieee802_1x_hdr *hdr;
739 struct wpa_eapol_key *key;
740 u16 key_info, key_data_length;
741 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
742 SMK_M1, SMK_M3, SMK_ERROR } msg;
743 char *msgtxt;
744 struct wpa_eapol_ie_parse kde;
745 int ft;
746 const u8 *eapol_key_ie;
747 size_t eapol_key_ie_len;
748
749 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
750 return;
751
752 if (data_len < sizeof(*hdr) + sizeof(*key))
753 return;
754
755 hdr = (struct ieee802_1x_hdr *) data;
756 key = (struct wpa_eapol_key *) (hdr + 1);
757 key_info = WPA_GET_BE16(key->key_info);
758 key_data_length = WPA_GET_BE16(key->key_data_length);
759 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
760 " key_info=0x%x type=%u key_data_length=%u",
761 MAC2STR(sm->addr), key_info, key->type, key_data_length);
762 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
763 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
764 "key_data overflow (%d > %lu)",
765 key_data_length,
766 (unsigned long) (data_len - sizeof(*hdr) -
767 sizeof(*key)));
768 return;
769 }
770
771 if (sm->wpa == WPA_VERSION_WPA2) {
772 if (key->type == EAPOL_KEY_TYPE_WPA) {
773 /*
774 * Some deployed station implementations seem to send
775 * msg 4/4 with incorrect type value in WPA2 mode.
776 */
777 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
778 "with unexpected WPA type in RSN mode");
779 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
780 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
781 "unexpected type %d in RSN mode",
782 key->type);
783 return;
784 }
785 } else {
786 if (key->type != EAPOL_KEY_TYPE_WPA) {
787 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
788 "unexpected type %d in WPA mode",
789 key->type);
790 return;
791 }
792 }
793
794 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
795 WPA_NONCE_LEN);
796 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
797 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
798
799 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
800 * are set */
801
802 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
803 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
804 if (key_info & WPA_KEY_INFO_ERROR) {
805 msg = SMK_ERROR;
806 msgtxt = "SMK Error";
807 } else {
808 msg = SMK_M1;
809 msgtxt = "SMK M1";
810 }
811 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
812 msg = SMK_M3;
813 msgtxt = "SMK M3";
814 } else if (key_info & WPA_KEY_INFO_REQUEST) {
815 msg = REQUEST;
816 msgtxt = "Request";
817 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
818 msg = GROUP_2;
819 msgtxt = "2/2 Group";
820 } else if (key_data_length == 0) {
821 msg = PAIRWISE_4;
822 msgtxt = "4/4 Pairwise";
823 } else {
824 msg = PAIRWISE_2;
825 msgtxt = "2/4 Pairwise";
826 }
827
828 /* TODO: key_info type validation for PeerKey */
829 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
830 msg == GROUP_2) {
831 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
832 if (sm->pairwise == WPA_CIPHER_CCMP ||
833 sm->pairwise == WPA_CIPHER_GCMP) {
834 if (wpa_use_aes_cmac(sm) &&
835 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
836 wpa_auth_logger(wpa_auth, sm->addr,
837 LOGGER_WARNING,
838 "advertised support for "
839 "AES-128-CMAC, but did not "
840 "use it");
841 return;
842 }
843
844 if (!wpa_use_aes_cmac(sm) &&
845 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
846 wpa_auth_logger(wpa_auth, sm->addr,
847 LOGGER_WARNING,
848 "did not use HMAC-SHA1-AES "
849 "with CCMP/GCMP");
850 return;
851 }
852 }
853 }
854
855 if (key_info & WPA_KEY_INFO_REQUEST) {
856 if (sm->req_replay_counter_used &&
857 os_memcmp(key->replay_counter, sm->req_replay_counter,
858 WPA_REPLAY_COUNTER_LEN) <= 0) {
859 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
860 "received EAPOL-Key request with "
861 "replayed counter");
862 return;
863 }
864 }
865
866 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
867 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
868 int i;
869
870 if (msg == PAIRWISE_2 &&
871 wpa_replay_counter_valid(sm->prev_key_replay,
872 key->replay_counter) &&
873 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
874 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
875 {
876 /*
877 * Some supplicant implementations (e.g., Windows XP
878 * WZC) update SNonce for each EAPOL-Key 2/4. This
879 * breaks the workaround on accepting any of the
880 * pending requests, so allow the SNonce to be updated
881 * even if we have already sent out EAPOL-Key 3/4.
882 */
883 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
884 "Process SNonce update from STA "
885 "based on retransmitted EAPOL-Key "
886 "1/4");
887 sm->update_snonce = 1;
888 wpa_replay_counter_mark_invalid(sm->prev_key_replay,
889 key->replay_counter);
890 goto continue_processing;
891 }
892
893 if (msg == PAIRWISE_2 &&
894 wpa_replay_counter_valid(sm->prev_key_replay,
895 key->replay_counter) &&
896 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
897 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
898 "ignore retransmitted EAPOL-Key %s - "
899 "SNonce did not change", msgtxt);
900 } else {
901 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
902 "received EAPOL-Key %s with "
903 "unexpected replay counter", msgtxt);
904 }
905 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
906 if (!sm->key_replay[i].valid)
907 break;
908 wpa_hexdump(MSG_DEBUG, "pending replay counter",
909 sm->key_replay[i].counter,
910 WPA_REPLAY_COUNTER_LEN);
911 }
912 wpa_hexdump(MSG_DEBUG, "received replay counter",
913 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
914 return;
915 }
916
917 continue_processing:
918 switch (msg) {
919 case PAIRWISE_2:
920 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
921 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
922 (!sm->update_snonce ||
923 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
924 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
925 "received EAPOL-Key msg 2/4 in "
926 "invalid state (%d) - dropped",
927 sm->wpa_ptk_state);
928 return;
929 }
930 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
931 if (sm->group->reject_4way_hs_for_entropy) {
932 /*
933 * The system did not have enough entropy to generate
934 * strong random numbers. Reject the first 4-way
935 * handshake(s) and collect some entropy based on the
936 * information from it. Once enough entropy is
937 * available, the next atempt will trigger GMK/Key
938 * Counter update and the station will be allowed to
939 * continue.
940 */
941 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
942 "collect more entropy for random number "
943 "generation");
944 random_mark_pool_ready();
945 wpa_sta_disconnect(wpa_auth, sm->addr);
946 return;
947 }
948 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
949 &kde) < 0) {
950 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
951 "received EAPOL-Key msg 2/4 with "
952 "invalid Key Data contents");
953 return;
954 }
955 if (kde.rsn_ie) {
956 eapol_key_ie = kde.rsn_ie;
957 eapol_key_ie_len = kde.rsn_ie_len;
958 } else {
959 eapol_key_ie = kde.wpa_ie;
960 eapol_key_ie_len = kde.wpa_ie_len;
961 }
962 ft = sm->wpa == WPA_VERSION_WPA2 &&
963 wpa_key_mgmt_ft(sm->wpa_key_mgmt);
964 if (sm->wpa_ie == NULL ||
965 wpa_compare_rsn_ie(ft,
966 sm->wpa_ie, sm->wpa_ie_len,
967 eapol_key_ie, eapol_key_ie_len)) {
968 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
969 "WPA IE from (Re)AssocReq did not "
970 "match with msg 2/4");
971 if (sm->wpa_ie) {
972 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
973 sm->wpa_ie, sm->wpa_ie_len);
974 }
975 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
976 eapol_key_ie, eapol_key_ie_len);
977 /* MLME-DEAUTHENTICATE.request */
978 wpa_sta_disconnect(wpa_auth, sm->addr);
979 return;
980 }
981 #ifdef CONFIG_IEEE80211R
982 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
983 wpa_sta_disconnect(wpa_auth, sm->addr);
984 return;
985 }
986 #endif /* CONFIG_IEEE80211R */
987 break;
988 case PAIRWISE_4:
989 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
990 !sm->PTK_valid) {
991 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
992 "received EAPOL-Key msg 4/4 in "
993 "invalid state (%d) - dropped",
994 sm->wpa_ptk_state);
995 return;
996 }
997 break;
998 case GROUP_2:
999 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1000 || !sm->PTK_valid) {
1001 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1002 "received EAPOL-Key msg 2/2 in "
1003 "invalid state (%d) - dropped",
1004 sm->wpa_ptk_group_state);
1005 return;
1006 }
1007 break;
1008 #ifdef CONFIG_PEERKEY
1009 case SMK_M1:
1010 case SMK_M3:
1011 case SMK_ERROR:
1012 if (!wpa_auth->conf.peerkey) {
1013 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1014 "PeerKey use disabled - ignoring message");
1015 return;
1016 }
1017 if (!sm->PTK_valid) {
1018 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1019 "received EAPOL-Key msg SMK in "
1020 "invalid state - dropped");
1021 return;
1022 }
1023 break;
1024 #else /* CONFIG_PEERKEY */
1025 case SMK_M1:
1026 case SMK_M3:
1027 case SMK_ERROR:
1028 return; /* STSL disabled - ignore SMK messages */
1029 #endif /* CONFIG_PEERKEY */
1030 case REQUEST:
1031 break;
1032 }
1033
1034 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1035 "received EAPOL-Key frame (%s)", msgtxt);
1036
1037 if (key_info & WPA_KEY_INFO_ACK) {
1038 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1039 "received invalid EAPOL-Key: Key Ack set");
1040 return;
1041 }
1042
1043 if (!(key_info & WPA_KEY_INFO_MIC)) {
1044 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1045 "received invalid EAPOL-Key: Key MIC not set");
1046 return;
1047 }
1048
1049 sm->MICVerified = FALSE;
1050 if (sm->PTK_valid && !sm->update_snonce) {
1051 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1052 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1053 "received EAPOL-Key with invalid MIC");
1054 return;
1055 }
1056 sm->MICVerified = TRUE;
1057 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1058 sm->pending_1_of_4_timeout = 0;
1059 }
1060
1061 if (key_info & WPA_KEY_INFO_REQUEST) {
1062 if (sm->MICVerified) {
1063 sm->req_replay_counter_used = 1;
1064 os_memcpy(sm->req_replay_counter, key->replay_counter,
1065 WPA_REPLAY_COUNTER_LEN);
1066 } else {
1067 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1068 "received EAPOL-Key request with "
1069 "invalid MIC");
1070 return;
1071 }
1072
1073 /*
1074 * TODO: should decrypt key data field if encryption was used;
1075 * even though MAC address KDE is not normally encrypted,
1076 * supplicant is allowed to encrypt it.
1077 */
1078 if (msg == SMK_ERROR) {
1079 #ifdef CONFIG_PEERKEY
1080 wpa_smk_error(wpa_auth, sm, key);
1081 #endif /* CONFIG_PEERKEY */
1082 return;
1083 } else if (key_info & WPA_KEY_INFO_ERROR) {
1084 wpa_receive_error_report(
1085 wpa_auth, sm,
1086 !(key_info & WPA_KEY_INFO_KEY_TYPE));
1087 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1088 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1089 "received EAPOL-Key Request for new "
1090 "4-Way Handshake");
1091 wpa_request_new_ptk(sm);
1092 #ifdef CONFIG_PEERKEY
1093 } else if (msg == SMK_M1) {
1094 wpa_smk_m1(wpa_auth, sm, key);
1095 #endif /* CONFIG_PEERKEY */
1096 } else if (key_data_length > 0 &&
1097 wpa_parse_kde_ies((const u8 *) (key + 1),
1098 key_data_length, &kde) == 0 &&
1099 kde.mac_addr) {
1100 } else {
1101 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1102 "received EAPOL-Key Request for GTK "
1103 "rekeying");
1104 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1105 wpa_rekey_gtk(wpa_auth, NULL);
1106 }
1107 } else {
1108 /* Do not allow the same key replay counter to be reused. */
1109 wpa_replay_counter_mark_invalid(sm->key_replay,
1110 key->replay_counter);
1111
1112 if (msg == PAIRWISE_2) {
1113 /*
1114 * Maintain a copy of the pending EAPOL-Key frames in
1115 * case the EAPOL-Key frame was retransmitted. This is
1116 * needed to allow EAPOL-Key msg 2/4 reply to another
1117 * pending msg 1/4 to update the SNonce to work around
1118 * unexpected supplicant behavior.
1119 */
1120 os_memcpy(sm->prev_key_replay, sm->key_replay,
1121 sizeof(sm->key_replay));
1122 } else {
1123 os_memset(sm->prev_key_replay, 0,
1124 sizeof(sm->prev_key_replay));
1125 }
1126
1127 /*
1128 * Make sure old valid counters are not accepted anymore and
1129 * do not get copied again.
1130 */
1131 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1132 }
1133
1134 #ifdef CONFIG_PEERKEY
1135 if (msg == SMK_M3) {
1136 wpa_smk_m3(wpa_auth, sm, key);
1137 return;
1138 }
1139 #endif /* CONFIG_PEERKEY */
1140
1141 os_free(sm->last_rx_eapol_key);
1142 sm->last_rx_eapol_key = os_malloc(data_len);
1143 if (sm->last_rx_eapol_key == NULL)
1144 return;
1145 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1146 sm->last_rx_eapol_key_len = data_len;
1147
1148 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1149 sm->EAPOLKeyReceived = TRUE;
1150 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1151 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1152 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1153 wpa_sm_step(sm);
1154 }
1155
1156
1157 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1158 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1159 {
1160 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1161 u8 *pos;
1162 int ret = 0;
1163
1164 /* GTK = PRF-X(GMK, "Group key expansion",
1165 * AA || GNonce || Time || random data)
1166 * The example described in the IEEE 802.11 standard uses only AA and
1167 * GNonce as inputs here. Add some more entropy since this derivation
1168 * is done only at the Authenticator and as such, does not need to be
1169 * exactly same.
1170 */
1171 os_memcpy(data, addr, ETH_ALEN);
1172 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1173 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1174 wpa_get_ntp_timestamp(pos);
1175 pos += 8;
1176 if (random_get_bytes(pos, 16) < 0)
1177 ret = -1;
1178
1179 #ifdef CONFIG_IEEE80211W
1180 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1181 #else /* CONFIG_IEEE80211W */
1182 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1183 < 0)
1184 ret = -1;
1185 #endif /* CONFIG_IEEE80211W */
1186
1187 return ret;
1188 }
1189
1190
1191 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1192 {
1193 struct wpa_authenticator *wpa_auth = eloop_ctx;
1194 struct wpa_state_machine *sm = timeout_ctx;
1195
1196 sm->pending_1_of_4_timeout = 0;
1197 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1198 sm->TimeoutEvt = TRUE;
1199 wpa_sm_step(sm);
1200 }
1201
1202
1203 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1204 struct wpa_state_machine *sm, int key_info,
1205 const u8 *key_rsc, const u8 *nonce,
1206 const u8 *kde, size_t kde_len,
1207 int keyidx, int encr, int force_version)
1208 {
1209 struct ieee802_1x_hdr *hdr;
1210 struct wpa_eapol_key *key;
1211 size_t len;
1212 int alg;
1213 int key_data_len, pad_len = 0;
1214 u8 *buf, *pos;
1215 int version, pairwise;
1216 int i;
1217
1218 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1219
1220 if (force_version)
1221 version = force_version;
1222 else if (wpa_use_aes_cmac(sm))
1223 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1224 else if (sm->pairwise != WPA_CIPHER_TKIP)
1225 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1226 else
1227 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1228
1229 pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1230
1231 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1232 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1233 "encr=%d)",
1234 version,
1235 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1236 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1237 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1238 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1239 pairwise, (unsigned long) kde_len, keyidx, encr);
1240
1241 key_data_len = kde_len;
1242
1243 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1244 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1245 pad_len = key_data_len % 8;
1246 if (pad_len)
1247 pad_len = 8 - pad_len;
1248 key_data_len += pad_len + 8;
1249 }
1250
1251 len += key_data_len;
1252
1253 hdr = os_zalloc(len);
1254 if (hdr == NULL)
1255 return;
1256 hdr->version = wpa_auth->conf.eapol_version;
1257 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1258 hdr->length = host_to_be16(len - sizeof(*hdr));
1259 key = (struct wpa_eapol_key *) (hdr + 1);
1260
1261 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1262 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1263 key_info |= version;
1264 if (encr && sm->wpa == WPA_VERSION_WPA2)
1265 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1266 if (sm->wpa != WPA_VERSION_WPA2)
1267 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1268 WPA_PUT_BE16(key->key_info, key_info);
1269
1270 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1271 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1272 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1273 WPA_PUT_BE16(key->key_length, 0);
1274
1275 /* FIX: STSL: what to use as key_replay_counter? */
1276 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1277 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1278 os_memcpy(sm->key_replay[i].counter,
1279 sm->key_replay[i - 1].counter,
1280 WPA_REPLAY_COUNTER_LEN);
1281 }
1282 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1283 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1284 WPA_REPLAY_COUNTER_LEN);
1285 sm->key_replay[0].valid = TRUE;
1286
1287 if (nonce)
1288 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1289
1290 if (key_rsc)
1291 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1292
1293 if (kde && !encr) {
1294 os_memcpy(key + 1, kde, kde_len);
1295 WPA_PUT_BE16(key->key_data_length, kde_len);
1296 } else if (encr && kde) {
1297 buf = os_zalloc(key_data_len);
1298 if (buf == NULL) {
1299 os_free(hdr);
1300 return;
1301 }
1302 pos = buf;
1303 os_memcpy(pos, kde, kde_len);
1304 pos += kde_len;
1305
1306 if (pad_len)
1307 *pos++ = 0xdd;
1308
1309 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1310 buf, key_data_len);
1311 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1312 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1313 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1314 (u8 *) (key + 1))) {
1315 os_free(hdr);
1316 os_free(buf);
1317 return;
1318 }
1319 WPA_PUT_BE16(key->key_data_length, key_data_len);
1320 } else {
1321 u8 ek[32];
1322 os_memcpy(key->key_iv,
1323 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1324 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1325 os_memcpy(ek, key->key_iv, 16);
1326 os_memcpy(ek + 16, sm->PTK.kek, 16);
1327 os_memcpy(key + 1, buf, key_data_len);
1328 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1329 WPA_PUT_BE16(key->key_data_length, key_data_len);
1330 }
1331 os_free(buf);
1332 }
1333
1334 if (key_info & WPA_KEY_INFO_MIC) {
1335 if (!sm->PTK_valid) {
1336 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1337 "PTK not valid when sending EAPOL-Key "
1338 "frame");
1339 os_free(hdr);
1340 return;
1341 }
1342 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1343 key->key_mic);
1344 }
1345
1346 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1347 1);
1348 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1349 sm->pairwise_set);
1350 os_free(hdr);
1351 }
1352
1353
1354 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1355 struct wpa_state_machine *sm, int key_info,
1356 const u8 *key_rsc, const u8 *nonce,
1357 const u8 *kde, size_t kde_len,
1358 int keyidx, int encr)
1359 {
1360 int timeout_ms;
1361 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1362 int ctr;
1363
1364 if (sm == NULL)
1365 return;
1366
1367 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1368 keyidx, encr, 0);
1369
1370 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1371 if (ctr == 1 && wpa_auth->conf.tx_status)
1372 timeout_ms = pairwise ? eapol_key_timeout_first :
1373 eapol_key_timeout_first_group;
1374 else
1375 timeout_ms = eapol_key_timeout_subseq;
1376 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1377 sm->pending_1_of_4_timeout = 1;
1378 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1379 "counter %d)", timeout_ms, ctr);
1380 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1381 wpa_send_eapol_timeout, wpa_auth, sm);
1382 }
1383
1384
1385 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1386 {
1387 struct ieee802_1x_hdr *hdr;
1388 struct wpa_eapol_key *key;
1389 u16 key_info;
1390 int ret = 0;
1391 u8 mic[16];
1392
1393 if (data_len < sizeof(*hdr) + sizeof(*key))
1394 return -1;
1395
1396 hdr = (struct ieee802_1x_hdr *) data;
1397 key = (struct wpa_eapol_key *) (hdr + 1);
1398 key_info = WPA_GET_BE16(key->key_info);
1399 os_memcpy(mic, key->key_mic, 16);
1400 os_memset(key->key_mic, 0, 16);
1401 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1402 data, data_len, key->key_mic) ||
1403 os_memcmp(mic, key->key_mic, 16) != 0)
1404 ret = -1;
1405 os_memcpy(key->key_mic, mic, 16);
1406 return ret;
1407 }
1408
1409
1410 void wpa_remove_ptk(struct wpa_state_machine *sm)
1411 {
1412 sm->PTK_valid = FALSE;
1413 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1414 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1415 sm->pairwise_set = FALSE;
1416 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1417 }
1418
1419
1420 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1421 {
1422 int remove_ptk = 1;
1423
1424 if (sm == NULL)
1425 return -1;
1426
1427 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1428 "event %d notification", event);
1429
1430 switch (event) {
1431 case WPA_AUTH:
1432 case WPA_ASSOC:
1433 break;
1434 case WPA_DEAUTH:
1435 case WPA_DISASSOC:
1436 sm->DeauthenticationRequest = TRUE;
1437 break;
1438 case WPA_REAUTH:
1439 case WPA_REAUTH_EAPOL:
1440 if (!sm->started) {
1441 /*
1442 * When using WPS, we may end up here if the STA
1443 * manages to re-associate without the previous STA
1444 * entry getting removed. Consequently, we need to make
1445 * sure that the WPA state machines gets initialized
1446 * properly at this point.
1447 */
1448 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1449 "started - initialize now");
1450 sm->started = 1;
1451 sm->Init = TRUE;
1452 if (wpa_sm_step(sm) == 1)
1453 return 1; /* should not really happen */
1454 sm->Init = FALSE;
1455 sm->AuthenticationRequest = TRUE;
1456 break;
1457 }
1458 if (sm->GUpdateStationKeys) {
1459 /*
1460 * Reauthentication cancels the pending group key
1461 * update for this STA.
1462 */
1463 sm->group->GKeyDoneStations--;
1464 sm->GUpdateStationKeys = FALSE;
1465 sm->PtkGroupInit = TRUE;
1466 }
1467 sm->ReAuthenticationRequest = TRUE;
1468 break;
1469 case WPA_ASSOC_FT:
1470 #ifdef CONFIG_IEEE80211R
1471 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1472 "after association");
1473 wpa_ft_install_ptk(sm);
1474
1475 /* Using FT protocol, not WPA auth state machine */
1476 sm->ft_completed = 1;
1477 return 0;
1478 #else /* CONFIG_IEEE80211R */
1479 break;
1480 #endif /* CONFIG_IEEE80211R */
1481 }
1482
1483 #ifdef CONFIG_IEEE80211R
1484 sm->ft_completed = 0;
1485 #endif /* CONFIG_IEEE80211R */
1486
1487 #ifdef CONFIG_IEEE80211W
1488 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1489 remove_ptk = 0;
1490 #endif /* CONFIG_IEEE80211W */
1491
1492 if (remove_ptk) {
1493 sm->PTK_valid = FALSE;
1494 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1495
1496 if (event != WPA_REAUTH_EAPOL)
1497 wpa_remove_ptk(sm);
1498 }
1499
1500 return wpa_sm_step(sm);
1501 }
1502
1503
1504 SM_STATE(WPA_PTK, INITIALIZE)
1505 {
1506 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1507 if (sm->Init) {
1508 /* Init flag is not cleared here, so avoid busy
1509 * loop by claiming nothing changed. */
1510 sm->changed = FALSE;
1511 }
1512
1513 sm->keycount = 0;
1514 if (sm->GUpdateStationKeys)
1515 sm->group->GKeyDoneStations--;
1516 sm->GUpdateStationKeys = FALSE;
1517 if (sm->wpa == WPA_VERSION_WPA)
1518 sm->PInitAKeys = FALSE;
1519 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1520 * Local AA > Remote AA)) */) {
1521 sm->Pair = TRUE;
1522 }
1523 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1524 wpa_remove_ptk(sm);
1525 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1526 sm->TimeoutCtr = 0;
1527 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1528 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1529 WPA_EAPOL_authorized, 0);
1530 }
1531 }
1532
1533
1534 SM_STATE(WPA_PTK, DISCONNECT)
1535 {
1536 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1537 sm->Disconnect = FALSE;
1538 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1539 }
1540
1541
1542 SM_STATE(WPA_PTK, DISCONNECTED)
1543 {
1544 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1545 sm->DeauthenticationRequest = FALSE;
1546 }
1547
1548
1549 SM_STATE(WPA_PTK, AUTHENTICATION)
1550 {
1551 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1552 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1553 sm->PTK_valid = FALSE;
1554 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1555 1);
1556 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1557 sm->AuthenticationRequest = FALSE;
1558 }
1559
1560
1561 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1562 struct wpa_group *group)
1563 {
1564 if (group->first_sta_seen)
1565 return;
1566 /*
1567 * System has run bit further than at the time hostapd was started
1568 * potentially very early during boot up. This provides better chances
1569 * of collecting more randomness on embedded systems. Re-initialize the
1570 * GMK and Counter here to improve their strength if there was not
1571 * enough entropy available immediately after system startup.
1572 */
1573 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1574 "station");
1575 if (random_pool_ready() != 1) {
1576 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1577 "to proceed - reject first 4-way handshake");
1578 group->reject_4way_hs_for_entropy = TRUE;
1579 } else {
1580 group->first_sta_seen = TRUE;
1581 group->reject_4way_hs_for_entropy = FALSE;
1582 }
1583
1584 wpa_group_init_gmk_and_counter(wpa_auth, group);
1585 wpa_gtk_update(wpa_auth, group);
1586 wpa_group_config_group_keys(wpa_auth, group);
1587 }
1588
1589
1590 SM_STATE(WPA_PTK, AUTHENTICATION2)
1591 {
1592 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1593
1594 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1595
1596 /*
1597 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1598 * ambiguous. The Authenticator state machine uses a counter that is
1599 * incremented by one for each 4-way handshake. However, the security
1600 * analysis of 4-way handshake points out that unpredictable nonces
1601 * help in preventing precomputation attacks. Instead of the state
1602 * machine definition, use an unpredictable nonce value here to provide
1603 * stronger protection against potential precomputation attacks.
1604 */
1605 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1606 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1607 "ANonce.");
1608 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1609 return;
1610 }
1611 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1612 WPA_NONCE_LEN);
1613 sm->ReAuthenticationRequest = FALSE;
1614 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1615 * logical place than INITIALIZE since AUTHENTICATION2 can be
1616 * re-entered on ReAuthenticationRequest without going through
1617 * INITIALIZE. */
1618 sm->TimeoutCtr = 0;
1619 }
1620
1621
1622 SM_STATE(WPA_PTK, INITPMK)
1623 {
1624 u8 msk[2 * PMK_LEN];
1625 size_t len = 2 * PMK_LEN;
1626
1627 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1628 #ifdef CONFIG_IEEE80211R
1629 sm->xxkey_len = 0;
1630 #endif /* CONFIG_IEEE80211R */
1631 if (sm->pmksa) {
1632 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1633 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1634 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1635 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1636 "(len=%lu)", (unsigned long) len);
1637 os_memcpy(sm->PMK, msk, PMK_LEN);
1638 #ifdef CONFIG_IEEE80211R
1639 if (len >= 2 * PMK_LEN) {
1640 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1641 sm->xxkey_len = PMK_LEN;
1642 }
1643 #endif /* CONFIG_IEEE80211R */
1644 } else {
1645 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1646 }
1647
1648 sm->req_replay_counter_used = 0;
1649 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1650 * will break reauthentication since EAPOL state machines may not be
1651 * get into AUTHENTICATING state that clears keyRun before WPA state
1652 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1653 * state and takes PMK from the previously used AAA Key. This will
1654 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1655 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1656 * be good workaround for this issue. */
1657 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1658 }
1659
1660
1661 SM_STATE(WPA_PTK, INITPSK)
1662 {
1663 const u8 *psk;
1664 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1665 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL);
1666 if (psk) {
1667 os_memcpy(sm->PMK, psk, PMK_LEN);
1668 #ifdef CONFIG_IEEE80211R
1669 os_memcpy(sm->xxkey, psk, PMK_LEN);
1670 sm->xxkey_len = PMK_LEN;
1671 #endif /* CONFIG_IEEE80211R */
1672 }
1673 sm->req_replay_counter_used = 0;
1674 }
1675
1676
1677 SM_STATE(WPA_PTK, PTKSTART)
1678 {
1679 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1680 size_t pmkid_len = 0;
1681
1682 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1683 sm->PTKRequest = FALSE;
1684 sm->TimeoutEvt = FALSE;
1685
1686 sm->TimeoutCtr++;
1687 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1688 /* No point in sending the EAPOL-Key - we will disconnect
1689 * immediately following this. */
1690 return;
1691 }
1692
1693 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1694 "sending 1/4 msg of 4-Way Handshake");
1695 /*
1696 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1697 * one possible PSK for this STA.
1698 */
1699 if (sm->wpa == WPA_VERSION_WPA2 &&
1700 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1701 pmkid = buf;
1702 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1703 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1704 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1705 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1706 if (sm->pmksa)
1707 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1708 sm->pmksa->pmkid, PMKID_LEN);
1709 else {
1710 /*
1711 * Calculate PMKID since no PMKSA cache entry was
1712 * available with pre-calculated PMKID.
1713 */
1714 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1715 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1716 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1717 }
1718 }
1719 wpa_send_eapol(sm->wpa_auth, sm,
1720 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1721 sm->ANonce, pmkid, pmkid_len, 0, 0);
1722 }
1723
1724
1725 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1726 struct wpa_ptk *ptk)
1727 {
1728 size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64;
1729 #ifdef CONFIG_IEEE80211R
1730 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1731 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1732 #endif /* CONFIG_IEEE80211R */
1733
1734 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1735 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1736 (u8 *) ptk, ptk_len,
1737 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1738
1739 return 0;
1740 }
1741
1742
1743 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1744 {
1745 struct wpa_ptk PTK;
1746 int ok = 0;
1747 const u8 *pmk = NULL;
1748
1749 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1750 sm->EAPOLKeyReceived = FALSE;
1751 sm->update_snonce = FALSE;
1752
1753 /* WPA with IEEE 802.1X: use the derived PMK from EAP
1754 * WPA-PSK: iterate through possible PSKs and select the one matching
1755 * the packet */
1756 for (;;) {
1757 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1758 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk);
1759 if (pmk == NULL)
1760 break;
1761 } else
1762 pmk = sm->PMK;
1763
1764 wpa_derive_ptk(sm, pmk, &PTK);
1765
1766 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1767 sm->last_rx_eapol_key_len) == 0) {
1768 ok = 1;
1769 break;
1770 }
1771
1772 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1773 break;
1774 }
1775
1776 if (!ok) {
1777 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1778 "invalid MIC in msg 2/4 of 4-Way Handshake");
1779 return;
1780 }
1781
1782 #ifdef CONFIG_IEEE80211R
1783 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1784 /*
1785 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1786 * with the value we derived.
1787 */
1788 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1789 WPA_PMK_NAME_LEN) != 0) {
1790 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1791 "PMKR1Name mismatch in FT 4-way "
1792 "handshake");
1793 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1794 "Supplicant",
1795 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1796 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1797 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1798 return;
1799 }
1800 }
1801 #endif /* CONFIG_IEEE80211R */
1802
1803 sm->pending_1_of_4_timeout = 0;
1804 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1805
1806 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1807 /* PSK may have changed from the previous choice, so update
1808 * state machine data based on whatever PSK was selected here.
1809 */
1810 os_memcpy(sm->PMK, pmk, PMK_LEN);
1811 }
1812
1813 sm->MICVerified = TRUE;
1814
1815 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1816 sm->PTK_valid = TRUE;
1817 }
1818
1819
1820 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1821 {
1822 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1823 sm->TimeoutCtr = 0;
1824 }
1825
1826
1827 #ifdef CONFIG_IEEE80211W
1828
1829 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1830 {
1831 if (sm->mgmt_frame_prot) {
1832 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1833 }
1834
1835 return 0;
1836 }
1837
1838
1839 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1840 {
1841 struct wpa_igtk_kde igtk;
1842 struct wpa_group *gsm = sm->group;
1843
1844 if (!sm->mgmt_frame_prot)
1845 return pos;
1846
1847 igtk.keyid[0] = gsm->GN_igtk;
1848 igtk.keyid[1] = 0;
1849 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1850 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0)
1851 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1852 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1853 if (sm->wpa_auth->conf.disable_gtk) {
1854 /*
1855 * Provide unique random IGTK to each STA to prevent use of
1856 * IGTK in the BSS.
1857 */
1858 if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0)
1859 return pos;
1860 }
1861 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1862 (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1863
1864 return pos;
1865 }
1866
1867 #else /* CONFIG_IEEE80211W */
1868
1869 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1870 {
1871 return 0;
1872 }
1873
1874
1875 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1876 {
1877 return pos;
1878 }
1879
1880 #endif /* CONFIG_IEEE80211W */
1881
1882
1883 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1884 {
1885 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1886 size_t gtk_len, kde_len;
1887 struct wpa_group *gsm = sm->group;
1888 u8 *wpa_ie;
1889 int wpa_ie_len, secure, keyidx, encr = 0;
1890
1891 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1892 sm->TimeoutEvt = FALSE;
1893
1894 sm->TimeoutCtr++;
1895 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1896 /* No point in sending the EAPOL-Key - we will disconnect
1897 * immediately following this. */
1898 return;
1899 }
1900
1901 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1902 GTK[GN], IGTK, [FTIE], [TIE * 2])
1903 */
1904 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1905 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1906 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1907 wpa_ie = sm->wpa_auth->wpa_ie;
1908 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1909 if (sm->wpa == WPA_VERSION_WPA &&
1910 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1911 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1912 /* WPA-only STA, remove RSN IE */
1913 wpa_ie = wpa_ie + wpa_ie[1] + 2;
1914 wpa_ie_len = wpa_ie[1] + 2;
1915 }
1916 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1917 "sending 3/4 msg of 4-Way Handshake");
1918 if (sm->wpa == WPA_VERSION_WPA2) {
1919 /* WPA2 send GTK in the 4-way handshake */
1920 secure = 1;
1921 gtk = gsm->GTK[gsm->GN - 1];
1922 gtk_len = gsm->GTK_len;
1923 if (sm->wpa_auth->conf.disable_gtk) {
1924 /*
1925 * Provide unique random GTK to each STA to prevent use
1926 * of GTK in the BSS.
1927 */
1928 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
1929 return;
1930 gtk = dummy_gtk;
1931 }
1932 keyidx = gsm->GN;
1933 _rsc = rsc;
1934 encr = 1;
1935 } else {
1936 /* WPA does not include GTK in msg 3/4 */
1937 secure = 0;
1938 gtk = NULL;
1939 gtk_len = 0;
1940 keyidx = 0;
1941 _rsc = NULL;
1942 if (sm->rx_eapol_key_secure) {
1943 /*
1944 * It looks like Windows 7 supplicant tries to use
1945 * Secure bit in msg 2/4 after having reported Michael
1946 * MIC failure and it then rejects the 4-way handshake
1947 * if msg 3/4 does not set Secure bit. Work around this
1948 * by setting the Secure bit here even in the case of
1949 * WPA if the supplicant used it first.
1950 */
1951 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1952 "STA used Secure bit in WPA msg 2/4 - "
1953 "set Secure for 3/4 as workaround");
1954 secure = 1;
1955 }
1956 }
1957
1958 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
1959 if (gtk)
1960 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
1961 #ifdef CONFIG_IEEE80211R
1962 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1963 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
1964 kde_len += 300; /* FTIE + 2 * TIE */
1965 }
1966 #endif /* CONFIG_IEEE80211R */
1967 kde = os_malloc(kde_len);
1968 if (kde == NULL)
1969 return;
1970
1971 pos = kde;
1972 os_memcpy(pos, wpa_ie, wpa_ie_len);
1973 pos += wpa_ie_len;
1974 #ifdef CONFIG_IEEE80211R
1975 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1976 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
1977 if (res < 0) {
1978 wpa_printf(MSG_ERROR, "FT: Failed to insert "
1979 "PMKR1Name into RSN IE in EAPOL-Key data");
1980 os_free(kde);
1981 return;
1982 }
1983 pos += res;
1984 }
1985 #endif /* CONFIG_IEEE80211R */
1986 if (gtk) {
1987 u8 hdr[2];
1988 hdr[0] = keyidx & 0x03;
1989 hdr[1] = 0;
1990 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
1991 gtk, gtk_len);
1992 }
1993 pos = ieee80211w_kde_add(sm, pos);
1994
1995 #ifdef CONFIG_IEEE80211R
1996 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1997 int res;
1998 struct wpa_auth_config *conf;
1999
2000 conf = &sm->wpa_auth->conf;
2001 res = wpa_write_ftie(conf, conf->r0_key_holder,
2002 conf->r0_key_holder_len,
2003 NULL, NULL, pos, kde + kde_len - pos,
2004 NULL, 0);
2005 if (res < 0) {
2006 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2007 "into EAPOL-Key Key Data");
2008 os_free(kde);
2009 return;
2010 }
2011 pos += res;
2012
2013 /* TIE[ReassociationDeadline] (TU) */
2014 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2015 *pos++ = 5;
2016 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2017 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2018 pos += 4;
2019
2020 /* TIE[KeyLifetime] (seconds) */
2021 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2022 *pos++ = 5;
2023 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2024 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2025 pos += 4;
2026 }
2027 #endif /* CONFIG_IEEE80211R */
2028
2029 wpa_send_eapol(sm->wpa_auth, sm,
2030 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2031 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2032 WPA_KEY_INFO_KEY_TYPE,
2033 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2034 os_free(kde);
2035 }
2036
2037
2038 SM_STATE(WPA_PTK, PTKINITDONE)
2039 {
2040 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2041 sm->EAPOLKeyReceived = FALSE;
2042 if (sm->Pair) {
2043 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2044 int klen = wpa_cipher_key_len(sm->pairwise);
2045 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2046 sm->PTK.tk1, klen)) {
2047 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2048 return;
2049 }
2050 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2051 sm->pairwise_set = TRUE;
2052
2053 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2054 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2055 eloop_register_timeout(sm->wpa_auth->conf.
2056 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2057 sm->wpa_auth, sm);
2058 }
2059
2060 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2061 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2062 WPA_EAPOL_authorized, 1);
2063 }
2064 }
2065
2066 if (0 /* IBSS == TRUE */) {
2067 sm->keycount++;
2068 if (sm->keycount == 2) {
2069 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2070 WPA_EAPOL_portValid, 1);
2071 }
2072 } else {
2073 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2074 1);
2075 }
2076 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2077 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2078 if (sm->wpa == WPA_VERSION_WPA)
2079 sm->PInitAKeys = TRUE;
2080 else
2081 sm->has_GTK = TRUE;
2082 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2083 "pairwise key handshake completed (%s)",
2084 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2085
2086 #ifdef CONFIG_IEEE80211R
2087 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2088 #endif /* CONFIG_IEEE80211R */
2089 }
2090
2091
2092 SM_STEP(WPA_PTK)
2093 {
2094 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2095
2096 if (sm->Init)
2097 SM_ENTER(WPA_PTK, INITIALIZE);
2098 else if (sm->Disconnect
2099 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2100 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2101 "WPA_PTK: sm->Disconnect");
2102 SM_ENTER(WPA_PTK, DISCONNECT);
2103 }
2104 else if (sm->DeauthenticationRequest)
2105 SM_ENTER(WPA_PTK, DISCONNECTED);
2106 else if (sm->AuthenticationRequest)
2107 SM_ENTER(WPA_PTK, AUTHENTICATION);
2108 else if (sm->ReAuthenticationRequest)
2109 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2110 else if (sm->PTKRequest)
2111 SM_ENTER(WPA_PTK, PTKSTART);
2112 else switch (sm->wpa_ptk_state) {
2113 case WPA_PTK_INITIALIZE:
2114 break;
2115 case WPA_PTK_DISCONNECT:
2116 SM_ENTER(WPA_PTK, DISCONNECTED);
2117 break;
2118 case WPA_PTK_DISCONNECTED:
2119 SM_ENTER(WPA_PTK, INITIALIZE);
2120 break;
2121 case WPA_PTK_AUTHENTICATION:
2122 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2123 break;
2124 case WPA_PTK_AUTHENTICATION2:
2125 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2126 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2127 WPA_EAPOL_keyRun) > 0)
2128 SM_ENTER(WPA_PTK, INITPMK);
2129 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2130 /* FIX: && 802.1X::keyRun */)
2131 SM_ENTER(WPA_PTK, INITPSK);
2132 break;
2133 case WPA_PTK_INITPMK:
2134 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2135 WPA_EAPOL_keyAvailable) > 0)
2136 SM_ENTER(WPA_PTK, PTKSTART);
2137 else {
2138 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2139 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2140 "INITPMK - keyAvailable = false");
2141 SM_ENTER(WPA_PTK, DISCONNECT);
2142 }
2143 break;
2144 case WPA_PTK_INITPSK:
2145 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL))
2146 SM_ENTER(WPA_PTK, PTKSTART);
2147 else {
2148 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2149 "no PSK configured for the STA");
2150 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2151 SM_ENTER(WPA_PTK, DISCONNECT);
2152 }
2153 break;
2154 case WPA_PTK_PTKSTART:
2155 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2156 sm->EAPOLKeyPairwise)
2157 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2158 else if (sm->TimeoutCtr >
2159 (int) dot11RSNAConfigPairwiseUpdateCount) {
2160 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2161 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2162 "PTKSTART: Retry limit %d reached",
2163 dot11RSNAConfigPairwiseUpdateCount);
2164 SM_ENTER(WPA_PTK, DISCONNECT);
2165 } else if (sm->TimeoutEvt)
2166 SM_ENTER(WPA_PTK, PTKSTART);
2167 break;
2168 case WPA_PTK_PTKCALCNEGOTIATING:
2169 if (sm->MICVerified)
2170 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2171 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2172 sm->EAPOLKeyPairwise)
2173 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2174 else if (sm->TimeoutEvt)
2175 SM_ENTER(WPA_PTK, PTKSTART);
2176 break;
2177 case WPA_PTK_PTKCALCNEGOTIATING2:
2178 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2179 break;
2180 case WPA_PTK_PTKINITNEGOTIATING:
2181 if (sm->update_snonce)
2182 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2183 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2184 sm->EAPOLKeyPairwise && sm->MICVerified)
2185 SM_ENTER(WPA_PTK, PTKINITDONE);
2186 else if (sm->TimeoutCtr >
2187 (int) dot11RSNAConfigPairwiseUpdateCount) {
2188 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2189 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2190 "PTKINITNEGOTIATING: Retry limit %d "
2191 "reached",
2192 dot11RSNAConfigPairwiseUpdateCount);
2193 SM_ENTER(WPA_PTK, DISCONNECT);
2194 } else if (sm->TimeoutEvt)
2195 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2196 break;
2197 case WPA_PTK_PTKINITDONE:
2198 break;
2199 }
2200 }
2201
2202
2203 SM_STATE(WPA_PTK_GROUP, IDLE)
2204 {
2205 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2206 if (sm->Init) {
2207 /* Init flag is not cleared here, so avoid busy
2208 * loop by claiming nothing changed. */
2209 sm->changed = FALSE;
2210 }
2211 sm->GTimeoutCtr = 0;
2212 }
2213
2214
2215 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2216 {
2217 u8 rsc[WPA_KEY_RSC_LEN];
2218 struct wpa_group *gsm = sm->group;
2219 u8 *kde, *pos, hdr[2];
2220 size_t kde_len;
2221 u8 *gtk, dummy_gtk[32];
2222
2223 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2224
2225 sm->GTimeoutCtr++;
2226 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2227 /* No point in sending the EAPOL-Key - we will disconnect
2228 * immediately following this. */
2229 return;
2230 }
2231
2232 if (sm->wpa == WPA_VERSION_WPA)
2233 sm->PInitAKeys = FALSE;
2234 sm->TimeoutEvt = FALSE;
2235 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2236 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2237 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2238 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2239 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2240 "sending 1/2 msg of Group Key Handshake");
2241
2242 gtk = gsm->GTK[gsm->GN - 1];
2243 if (sm->wpa_auth->conf.disable_gtk) {
2244 /*
2245 * Provide unique random GTK to each STA to prevent use
2246 * of GTK in the BSS.
2247 */
2248 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2249 return;
2250 gtk = dummy_gtk;
2251 }
2252 if (sm->wpa == WPA_VERSION_WPA2) {
2253 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2254 ieee80211w_kde_len(sm);
2255 kde = os_malloc(kde_len);
2256 if (kde == NULL)
2257 return;
2258
2259 pos = kde;
2260 hdr[0] = gsm->GN & 0x03;
2261 hdr[1] = 0;
2262 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2263 gtk, gsm->GTK_len);
2264 pos = ieee80211w_kde_add(sm, pos);
2265 } else {
2266 kde = gtk;
2267 pos = kde + gsm->GTK_len;
2268 }
2269
2270 wpa_send_eapol(sm->wpa_auth, sm,
2271 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2272 WPA_KEY_INFO_ACK |
2273 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2274 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2275 if (sm->wpa == WPA_VERSION_WPA2)
2276 os_free(kde);
2277 }
2278
2279
2280 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2281 {
2282 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2283 sm->EAPOLKeyReceived = FALSE;
2284 if (sm->GUpdateStationKeys)
2285 sm->group->GKeyDoneStations--;
2286 sm->GUpdateStationKeys = FALSE;
2287 sm->GTimeoutCtr = 0;
2288 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2289 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2290 "group key handshake completed (%s)",
2291 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2292 sm->has_GTK = TRUE;
2293 }
2294
2295
2296 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2297 {
2298 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2299 if (sm->GUpdateStationKeys)
2300 sm->group->GKeyDoneStations--;
2301 sm->GUpdateStationKeys = FALSE;
2302 sm->Disconnect = TRUE;
2303 }
2304
2305
2306 SM_STEP(WPA_PTK_GROUP)
2307 {
2308 if (sm->Init || sm->PtkGroupInit) {
2309 SM_ENTER(WPA_PTK_GROUP, IDLE);
2310 sm->PtkGroupInit = FALSE;
2311 } else switch (sm->wpa_ptk_group_state) {
2312 case WPA_PTK_GROUP_IDLE:
2313 if (sm->GUpdateStationKeys ||
2314 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2315 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2316 break;
2317 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2318 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2319 !sm->EAPOLKeyPairwise && sm->MICVerified)
2320 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2321 else if (sm->GTimeoutCtr >
2322 (int) dot11RSNAConfigGroupUpdateCount)
2323 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2324 else if (sm->TimeoutEvt)
2325 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2326 break;
2327 case WPA_PTK_GROUP_KEYERROR:
2328 SM_ENTER(WPA_PTK_GROUP, IDLE);
2329 break;
2330 case WPA_PTK_GROUP_REKEYESTABLISHED:
2331 SM_ENTER(WPA_PTK_GROUP, IDLE);
2332 break;
2333 }
2334 }
2335
2336
2337 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2338 struct wpa_group *group)
2339 {
2340 int ret = 0;
2341
2342 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2343 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2344 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2345 wpa_auth->addr, group->GNonce,
2346 group->GTK[group->GN - 1], group->GTK_len) < 0)
2347 ret = -1;
2348 wpa_hexdump_key(MSG_DEBUG, "GTK",
2349 group->GTK[group->GN - 1], group->GTK_len);
2350
2351 #ifdef CONFIG_IEEE80211W
2352 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2353 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2354 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2355 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2356 wpa_auth->addr, group->GNonce,
2357 group->IGTK[group->GN_igtk - 4],
2358 WPA_IGTK_LEN) < 0)
2359 ret = -1;
2360 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2361 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2362 }
2363 #endif /* CONFIG_IEEE80211W */
2364
2365 return ret;
2366 }
2367
2368
2369 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2370 struct wpa_group *group)
2371 {
2372 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2373 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2374 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2375 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2376
2377 /* GTK[0..N] = 0 */
2378 os_memset(group->GTK, 0, sizeof(group->GTK));
2379 group->GN = 1;
2380 group->GM = 2;
2381 #ifdef CONFIG_IEEE80211W
2382 group->GN_igtk = 4;
2383 group->GM_igtk = 5;
2384 #endif /* CONFIG_IEEE80211W */
2385 /* GTK[GN] = CalcGTK() */
2386 wpa_gtk_update(wpa_auth, group);
2387 }
2388
2389
2390 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2391 {
2392 if (ctx != NULL && ctx != sm->group)
2393 return 0;
2394
2395 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2396 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2397 "Not in PTKINITDONE; skip Group Key update");
2398 sm->GUpdateStationKeys = FALSE;
2399 return 0;
2400 }
2401 if (sm->GUpdateStationKeys) {
2402 /*
2403 * This should not really happen, so add a debug log entry.
2404 * Since we clear the GKeyDoneStations before the loop, the
2405 * station needs to be counted here anyway.
2406 */
2407 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2408 "GUpdateStationKeys was already set when "
2409 "marking station for GTK rekeying");
2410 }
2411
2412 #ifdef CONFIG_IEEE80211V
2413 /* Do not rekey GTK/IGTK when STA is in wnmsleep */
2414 if (sm->is_wnmsleep)
2415 return 0;
2416 #endif /* CONFIG_IEEE80211V */
2417
2418 sm->group->GKeyDoneStations++;
2419 sm->GUpdateStationKeys = TRUE;
2420
2421 wpa_sm_step(sm);
2422 return 0;
2423 }
2424
2425
2426 #ifdef CONFIG_IEEE80211V
2427 /* update GTK when exiting wnmsleep mode */
2428 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2429 {
2430 if (sm->is_wnmsleep)
2431 return;
2432
2433 wpa_group_update_sta(sm, NULL);
2434 }
2435
2436
2437 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2438 {
2439 sm->is_wnmsleep = !!flag;
2440 }
2441
2442
2443 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2444 {
2445 u8 *subelem;
2446 struct wpa_group *gsm = sm->group;
2447 size_t subelem_len, pad_len;
2448 const u8 *key;
2449 size_t key_len;
2450 u8 keybuf[32];
2451
2452 /* GTK subslement */
2453 key_len = gsm->GTK_len;
2454 if (key_len > sizeof(keybuf))
2455 return 0;
2456
2457 /*
2458 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
2459 * than 16 bytes.
2460 */
2461 pad_len = key_len % 8;
2462 if (pad_len)
2463 pad_len = 8 - pad_len;
2464 if (key_len + pad_len < 16)
2465 pad_len += 8;
2466 if (pad_len) {
2467 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
2468 os_memset(keybuf + key_len, 0, pad_len);
2469 keybuf[key_len] = 0xdd;
2470 key_len += pad_len;
2471 key = keybuf;
2472 } else
2473 key = gsm->GTK[gsm->GN - 1];
2474
2475 /*
2476 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2477 * Key[5..32] | 8 padding.
2478 */
2479 subelem_len = 13 + key_len + 8;
2480 subelem = os_zalloc(subelem_len);
2481 if (subelem == NULL)
2482 return 0;
2483
2484 subelem[0] = WNM_SLEEP_SUBELEM_GTK;
2485 subelem[1] = 11 + key_len + 8;
2486 /* Key ID in B0-B1 of Key Info */
2487 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
2488 subelem[4] = gsm->GTK_len;
2489 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5) != 0)
2490 {
2491 os_free(subelem);
2492 return 0;
2493 }
2494 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
2495 os_free(subelem);
2496 return 0;
2497 }
2498
2499 os_memcpy(pos, subelem, subelem_len);
2500
2501 wpa_hexdump_key(MSG_DEBUG, "Plaintext GTK",
2502 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2503 os_free(subelem);
2504
2505 return subelem_len;
2506 }
2507
2508
2509 #ifdef CONFIG_IEEE80211W
2510 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2511 {
2512 u8 *subelem, *ptr;
2513 struct wpa_group *gsm = sm->group;
2514 size_t subelem_len;
2515
2516 /* IGTK subelement
2517 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] |
2518 * Key[16] | 8 padding */
2519 subelem_len = 1 + 1 + 2 + 6 + WPA_IGTK_LEN + 8;
2520 subelem = os_zalloc(subelem_len);
2521 if (subelem == NULL)
2522 return 0;
2523
2524 ptr = subelem;
2525 *ptr++ = WNM_SLEEP_SUBELEM_IGTK;
2526 *ptr++ = subelem_len - 2;
2527 WPA_PUT_LE16(ptr, gsm->GN_igtk);
2528 ptr += 2;
2529 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, ptr) != 0) {
2530 os_free(subelem);
2531 return 0;
2532 }
2533 ptr += 6;
2534 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
2535 gsm->IGTK[gsm->GN_igtk - 4], ptr)) {
2536 os_free(subelem);
2537 return -1;
2538 }
2539
2540 os_memcpy(pos, subelem, subelem_len);
2541
2542 wpa_hexdump_key(MSG_DEBUG, "Plaintext IGTK",
2543 gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2544 os_free(subelem);
2545
2546 return subelem_len;
2547 }
2548 #endif /* CONFIG_IEEE80211W */
2549 #endif /* CONFIG_IEEE80211V */
2550
2551
2552 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2553 struct wpa_group *group)
2554 {
2555 int tmp;
2556
2557 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2558 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2559 group->changed = TRUE;
2560 group->wpa_group_state = WPA_GROUP_SETKEYS;
2561 group->GTKReKey = FALSE;
2562 tmp = group->GM;
2563 group->GM = group->GN;
2564 group->GN = tmp;
2565 #ifdef CONFIG_IEEE80211W
2566 tmp = group->GM_igtk;
2567 group->GM_igtk = group->GN_igtk;
2568 group->GN_igtk = tmp;
2569 #endif /* CONFIG_IEEE80211W */
2570 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2571 * counting the STAs that are marked with GUpdateStationKeys instead of
2572 * including all STAs that could be in not-yet-completed state. */
2573 wpa_gtk_update(wpa_auth, group);
2574
2575 if (group->GKeyDoneStations) {
2576 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2577 "GKeyDoneStations=%d when starting new GTK rekey",
2578 group->GKeyDoneStations);
2579 group->GKeyDoneStations = 0;
2580 }
2581 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2582 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2583 group->GKeyDoneStations);
2584 }
2585
2586
2587 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2588 struct wpa_group *group)
2589 {
2590 int ret = 0;
2591
2592 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2593 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2594 broadcast_ether_addr, group->GN,
2595 group->GTK[group->GN - 1], group->GTK_len) < 0)
2596 ret = -1;
2597
2598 #ifdef CONFIG_IEEE80211W
2599 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2600 wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2601 broadcast_ether_addr, group->GN_igtk,
2602 group->IGTK[group->GN_igtk - 4],
2603 WPA_IGTK_LEN) < 0)
2604 ret = -1;
2605 #endif /* CONFIG_IEEE80211W */
2606
2607 return ret;
2608 }
2609
2610
2611 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2612 struct wpa_group *group)
2613 {
2614 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2615 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2616 group->changed = TRUE;
2617 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2618
2619 if (wpa_group_config_group_keys(wpa_auth, group) < 0)
2620 return -1;
2621
2622 return 0;
2623 }
2624
2625
2626 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2627 struct wpa_group *group)
2628 {
2629 if (group->GInit) {
2630 wpa_group_gtk_init(wpa_auth, group);
2631 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2632 group->GTKAuthenticator) {
2633 wpa_group_setkeysdone(wpa_auth, group);
2634 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2635 group->GTKReKey) {
2636 wpa_group_setkeys(wpa_auth, group);
2637 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2638 if (group->GKeyDoneStations == 0)
2639 wpa_group_setkeysdone(wpa_auth, group);
2640 else if (group->GTKReKey)
2641 wpa_group_setkeys(wpa_auth, group);
2642 }
2643 }
2644
2645
2646 static int wpa_sm_step(struct wpa_state_machine *sm)
2647 {
2648 if (sm == NULL)
2649 return 0;
2650
2651 if (sm->in_step_loop) {
2652 /* This should not happen, but if it does, make sure we do not
2653 * end up freeing the state machine too early by exiting the
2654 * recursive call. */
2655 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2656 return 0;
2657 }
2658
2659 sm->in_step_loop = 1;
2660 do {
2661 if (sm->pending_deinit)
2662 break;
2663
2664 sm->changed = FALSE;
2665 sm->wpa_auth->group->changed = FALSE;
2666
2667 SM_STEP_RUN(WPA_PTK);
2668 if (sm->pending_deinit)
2669 break;
2670 SM_STEP_RUN(WPA_PTK_GROUP);
2671 if (sm->pending_deinit)
2672 break;
2673 wpa_group_sm_step(sm->wpa_auth, sm->group);
2674 } while (sm->changed || sm->wpa_auth->group->changed);
2675 sm->in_step_loop = 0;
2676
2677 if (sm->pending_deinit) {
2678 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2679 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2680 wpa_free_sta_sm(sm);
2681 return 1;
2682 }
2683 return 0;
2684 }
2685
2686
2687 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2688 {
2689 struct wpa_state_machine *sm = eloop_ctx;
2690 wpa_sm_step(sm);
2691 }
2692
2693
2694 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2695 {
2696 if (sm == NULL)
2697 return;
2698 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2699 }
2700
2701
2702 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2703 {
2704 int tmp, i;
2705 struct wpa_group *group;
2706
2707 if (wpa_auth == NULL)
2708 return;
2709
2710 group = wpa_auth->group;
2711
2712 for (i = 0; i < 2; i++) {
2713 tmp = group->GM;
2714 group->GM = group->GN;
2715 group->GN = tmp;
2716 #ifdef CONFIG_IEEE80211W
2717 tmp = group->GM_igtk;
2718 group->GM_igtk = group->GN_igtk;
2719 group->GN_igtk = tmp;
2720 #endif /* CONFIG_IEEE80211W */
2721 wpa_gtk_update(wpa_auth, group);
2722 wpa_group_config_group_keys(wpa_auth, group);
2723 }
2724 }
2725
2726
2727 static const char * wpa_bool_txt(int bool)
2728 {
2729 return bool ? "TRUE" : "FALSE";
2730 }
2731
2732
2733 #define RSN_SUITE "%02x-%02x-%02x-%d"
2734 #define RSN_SUITE_ARG(s) \
2735 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2736
2737 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2738 {
2739 int len = 0, ret;
2740 char pmkid_txt[PMKID_LEN * 2 + 1];
2741 #ifdef CONFIG_RSN_PREAUTH
2742 const int preauth = 1;
2743 #else /* CONFIG_RSN_PREAUTH */
2744 const int preauth = 0;
2745 #endif /* CONFIG_RSN_PREAUTH */
2746
2747 if (wpa_auth == NULL)
2748 return len;
2749
2750 ret = os_snprintf(buf + len, buflen - len,
2751 "dot11RSNAOptionImplemented=TRUE\n"
2752 "dot11RSNAPreauthenticationImplemented=%s\n"
2753 "dot11RSNAEnabled=%s\n"
2754 "dot11RSNAPreauthenticationEnabled=%s\n",
2755 wpa_bool_txt(preauth),
2756 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2757 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2758 if (ret < 0 || (size_t) ret >= buflen - len)
2759 return len;
2760 len += ret;
2761
2762 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2763 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2764
2765 ret = os_snprintf(
2766 buf + len, buflen - len,
2767 "dot11RSNAConfigVersion=%u\n"
2768 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2769 /* FIX: dot11RSNAConfigGroupCipher */
2770 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2771 /* FIX: dot11RSNAConfigGroupRekeyTime */
2772 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2773 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2774 "dot11RSNAConfigGroupUpdateCount=%u\n"
2775 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2776 "dot11RSNAConfigGroupCipherSize=%u\n"
2777 "dot11RSNAConfigPMKLifetime=%u\n"
2778 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2779 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2780 "dot11RSNAConfigSATimeout=%u\n"
2781 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2782 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2783 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2784 "dot11RSNAPMKIDUsed=%s\n"
2785 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2786 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2787 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2788 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2789 "dot11RSNA4WayHandshakeFailures=%u\n"
2790 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2791 RSN_VERSION,
2792 !!wpa_auth->conf.wpa_strict_rekey,
2793 dot11RSNAConfigGroupUpdateCount,
2794 dot11RSNAConfigPairwiseUpdateCount,
2795 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2796 dot11RSNAConfigPMKLifetime,
2797 dot11RSNAConfigPMKReauthThreshold,
2798 dot11RSNAConfigSATimeout,
2799 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2800 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2801 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2802 pmkid_txt,
2803 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2804 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2805 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2806 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2807 wpa_auth->dot11RSNA4WayHandshakeFailures);
2808 if (ret < 0 || (size_t) ret >= buflen - len)
2809 return len;
2810 len += ret;
2811
2812 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2813 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2814
2815 /* Private MIB */
2816 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2817 wpa_auth->group->wpa_group_state);
2818 if (ret < 0 || (size_t) ret >= buflen - len)
2819 return len;
2820 len += ret;
2821
2822 return len;
2823 }
2824
2825
2826 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2827 {
2828 int len = 0, ret;
2829 u32 pairwise = 0;
2830
2831 if (sm == NULL)
2832 return 0;
2833
2834 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2835
2836 /* dot11RSNAStatsEntry */
2837
2838 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2839 WPA_PROTO_RSN : WPA_PROTO_WPA,
2840 sm->pairwise);
2841 if (pairwise == 0)
2842 return 0;
2843
2844 ret = os_snprintf(
2845 buf + len, buflen - len,
2846 /* TODO: dot11RSNAStatsIndex */
2847 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2848 "dot11RSNAStatsVersion=1\n"
2849 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2850 /* TODO: dot11RSNAStatsTKIPICVErrors */
2851 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2852 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2853 /* TODO: dot11RSNAStatsCCMPReplays */
2854 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2855 /* TODO: dot11RSNAStatsTKIPReplays */,
2856 MAC2STR(sm->addr),
2857 RSN_SUITE_ARG(pairwise),
2858 sm->dot11RSNAStatsTKIPLocalMICFailures,
2859 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2860 if (ret < 0 || (size_t) ret >= buflen - len)
2861 return len;
2862 len += ret;
2863
2864 /* Private MIB */
2865 ret = os_snprintf(buf + len, buflen - len,
2866 "hostapdWPAPTKState=%d\n"
2867 "hostapdWPAPTKGroupState=%d\n",
2868 sm->wpa_ptk_state,
2869 sm->wpa_ptk_group_state);
2870 if (ret < 0 || (size_t) ret >= buflen - len)
2871 return len;
2872 len += ret;
2873
2874 return len;
2875 }
2876
2877
2878 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2879 {
2880 if (wpa_auth)
2881 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2882 }
2883
2884
2885 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2886 {
2887 return sm && sm->pairwise_set;
2888 }
2889
2890
2891 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2892 {
2893 return sm->pairwise;
2894 }
2895
2896
2897 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2898 {
2899 if (sm == NULL)
2900 return -1;
2901 return sm->wpa_key_mgmt;
2902 }
2903
2904
2905 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2906 {
2907 if (sm == NULL)
2908 return 0;
2909 return sm->wpa;
2910 }
2911
2912
2913 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2914 struct rsn_pmksa_cache_entry *entry)
2915 {
2916 if (sm == NULL || sm->pmksa != entry)
2917 return -1;
2918 sm->pmksa = NULL;
2919 return 0;
2920 }
2921
2922
2923 struct rsn_pmksa_cache_entry *
2924 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
2925 {
2926 return sm ? sm->pmksa : NULL;
2927 }
2928
2929
2930 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
2931 {
2932 if (sm)
2933 sm->dot11RSNAStatsTKIPLocalMICFailures++;
2934 }
2935
2936
2937 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
2938 {
2939 if (wpa_auth == NULL)
2940 return NULL;
2941 *len = wpa_auth->wpa_ie_len;
2942 return wpa_auth->wpa_ie;
2943 }
2944
2945
2946 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
2947 int session_timeout, struct eapol_state_machine *eapol)
2948 {
2949 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
2950 sm->wpa_auth->conf.disable_pmksa_caching)
2951 return -1;
2952
2953 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
2954 sm->wpa_auth->addr, sm->addr, session_timeout,
2955 eapol, sm->wpa_key_mgmt))
2956 return 0;
2957
2958 return -1;
2959 }
2960
2961
2962 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
2963 const u8 *pmk, size_t len, const u8 *sta_addr,
2964 int session_timeout,
2965 struct eapol_state_machine *eapol)
2966 {
2967 if (wpa_auth == NULL)
2968 return -1;
2969
2970 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
2971 sta_addr, session_timeout, eapol,
2972 WPA_KEY_MGMT_IEEE8021X))
2973 return 0;
2974
2975 return -1;
2976 }
2977
2978
2979 static struct wpa_group *
2980 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
2981 {
2982 struct wpa_group *group;
2983
2984 if (wpa_auth == NULL || wpa_auth->group == NULL)
2985 return NULL;
2986
2987 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
2988 vlan_id);
2989 group = wpa_group_init(wpa_auth, vlan_id, 0);
2990 if (group == NULL)
2991 return NULL;
2992
2993 group->next = wpa_auth->group->next;
2994 wpa_auth->group->next = group;
2995
2996 return group;
2997 }
2998
2999
3000 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3001 {
3002 struct wpa_group *group;
3003
3004 if (sm == NULL || sm->wpa_auth == NULL)
3005 return 0;
3006
3007 group = sm->wpa_auth->group;
3008 while (group) {
3009 if (group->vlan_id == vlan_id)
3010 break;
3011 group = group->next;
3012 }
3013
3014 if (group == NULL) {
3015 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3016 if (group == NULL)
3017 return -1;
3018 }
3019
3020 if (sm->group == group)
3021 return 0;
3022
3023 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3024 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3025
3026 sm->group = group;
3027 return 0;
3028 }
3029
3030
3031 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3032 struct wpa_state_machine *sm, int ack)
3033 {
3034 if (wpa_auth == NULL || sm == NULL)
3035 return;
3036 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3037 " ack=%d", MAC2STR(sm->addr), ack);
3038 if (sm->pending_1_of_4_timeout && ack) {
3039 /*
3040 * Some deployed supplicant implementations update their SNonce
3041 * for each EAPOL-Key 2/4 message even within the same 4-way
3042 * handshake and then fail to use the first SNonce when
3043 * deriving the PTK. This results in unsuccessful 4-way
3044 * handshake whenever the relatively short initial timeout is
3045 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3046 * around this by increasing the timeout now that we know that
3047 * the station has received the frame.
3048 */
3049 int timeout_ms = eapol_key_timeout_subseq;
3050 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3051 "timeout by %u ms because of acknowledged frame",
3052 timeout_ms);
3053 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3054 eloop_register_timeout(timeout_ms / 1000,
3055 (timeout_ms % 1000) * 1000,
3056 wpa_send_eapol_timeout, wpa_auth, sm);
3057 }
3058 }
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