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hostapd: Add Key MIC in group EAPOL-Key frames corruption test option
[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 int wpa_auth_mic_failure_report(
58 struct wpa_authenticator *wpa_auth, const u8 *addr)
59 {
60 if (wpa_auth->cb.mic_failure_report)
61 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
62 return 0;
63 }
64
65
66 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
67 const u8 *addr, wpa_eapol_variable var,
68 int value)
69 {
70 if (wpa_auth->cb.set_eapol)
71 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
72 }
73
74
75 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
76 const u8 *addr, wpa_eapol_variable var)
77 {
78 if (wpa_auth->cb.get_eapol == NULL)
79 return -1;
80 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
81 }
82
83
84 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
85 const u8 *addr, const u8 *prev_psk)
86 {
87 if (wpa_auth->cb.get_psk == NULL)
88 return NULL;
89 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk);
90 }
91
92
93 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
94 const u8 *addr, u8 *msk, size_t *len)
95 {
96 if (wpa_auth->cb.get_msk == NULL)
97 return -1;
98 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
99 }
100
101
102 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
103 int vlan_id,
104 enum wpa_alg alg, const u8 *addr, int idx,
105 u8 *key, size_t key_len)
106 {
107 if (wpa_auth->cb.set_key == NULL)
108 return -1;
109 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
110 key, key_len);
111 }
112
113
114 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
115 const u8 *addr, int idx, u8 *seq)
116 {
117 if (wpa_auth->cb.get_seqnum == NULL)
118 return -1;
119 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
120 }
121
122
123 static inline int
124 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
125 const u8 *data, size_t data_len, int encrypt)
126 {
127 if (wpa_auth->cb.send_eapol == NULL)
128 return -1;
129 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
130 encrypt);
131 }
132
133
134 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
135 int (*cb)(struct wpa_state_machine *sm, void *ctx),
136 void *cb_ctx)
137 {
138 if (wpa_auth->cb.for_each_sta == NULL)
139 return 0;
140 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
141 }
142
143
144 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
145 int (*cb)(struct wpa_authenticator *a, void *ctx),
146 void *cb_ctx)
147 {
148 if (wpa_auth->cb.for_each_auth == NULL)
149 return 0;
150 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
151 }
152
153
154 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
155 logger_level level, const char *txt)
156 {
157 if (wpa_auth->cb.logger == NULL)
158 return;
159 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
160 }
161
162
163 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
164 logger_level level, const char *fmt, ...)
165 {
166 char *format;
167 int maxlen;
168 va_list ap;
169
170 if (wpa_auth->cb.logger == NULL)
171 return;
172
173 maxlen = os_strlen(fmt) + 100;
174 format = os_malloc(maxlen);
175 if (!format)
176 return;
177
178 va_start(ap, fmt);
179 vsnprintf(format, maxlen, fmt, ap);
180 va_end(ap);
181
182 wpa_auth_logger(wpa_auth, addr, level, format);
183
184 os_free(format);
185 }
186
187
188 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
189 const u8 *addr)
190 {
191 if (wpa_auth->cb.disconnect == NULL)
192 return;
193 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
194 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
195 WLAN_REASON_PREV_AUTH_NOT_VALID);
196 }
197
198
199 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
200 {
201 int ret = 0;
202 #ifdef CONFIG_IEEE80211R
203 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
204 ret = 1;
205 #endif /* CONFIG_IEEE80211R */
206 #ifdef CONFIG_IEEE80211W
207 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
208 ret = 1;
209 #endif /* CONFIG_IEEE80211W */
210 return ret;
211 }
212
213
214 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
215 {
216 struct wpa_authenticator *wpa_auth = eloop_ctx;
217
218 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
219 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
220 "initialization.");
221 } else {
222 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
223 wpa_hexdump_key(MSG_DEBUG, "GMK",
224 wpa_auth->group->GMK, WPA_GMK_LEN);
225 }
226
227 if (wpa_auth->conf.wpa_gmk_rekey) {
228 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
229 wpa_rekey_gmk, wpa_auth, NULL);
230 }
231 }
232
233
234 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
235 {
236 struct wpa_authenticator *wpa_auth = eloop_ctx;
237 struct wpa_group *group;
238
239 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
240 for (group = wpa_auth->group; group; group = group->next) {
241 group->GTKReKey = TRUE;
242 do {
243 group->changed = FALSE;
244 wpa_group_sm_step(wpa_auth, group);
245 } while (group->changed);
246 }
247
248 if (wpa_auth->conf.wpa_group_rekey) {
249 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
250 0, wpa_rekey_gtk, wpa_auth, NULL);
251 }
252 }
253
254
255 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
256 {
257 struct wpa_authenticator *wpa_auth = eloop_ctx;
258 struct wpa_state_machine *sm = timeout_ctx;
259
260 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
261 wpa_request_new_ptk(sm);
262 wpa_sm_step(sm);
263 }
264
265
266 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
267 {
268 if (sm->pmksa == ctx)
269 sm->pmksa = NULL;
270 return 0;
271 }
272
273
274 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
275 void *ctx)
276 {
277 struct wpa_authenticator *wpa_auth = ctx;
278 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
279 }
280
281
282 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
283 struct wpa_group *group)
284 {
285 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
286 u8 rkey[32];
287 unsigned long ptr;
288
289 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
290 return -1;
291 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
292
293 /*
294 * Counter = PRF-256(Random number, "Init Counter",
295 * Local MAC Address || Time)
296 */
297 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
298 wpa_get_ntp_timestamp(buf + ETH_ALEN);
299 ptr = (unsigned long) group;
300 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
301 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
302 return -1;
303
304 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
305 group->Counter, WPA_NONCE_LEN) < 0)
306 return -1;
307 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
308 group->Counter, WPA_NONCE_LEN);
309
310 return 0;
311 }
312
313
314 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
315 int vlan_id, int delay_init)
316 {
317 struct wpa_group *group;
318
319 group = os_zalloc(sizeof(struct wpa_group));
320 if (group == NULL)
321 return NULL;
322
323 group->GTKAuthenticator = TRUE;
324 group->vlan_id = vlan_id;
325 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
326
327 if (random_pool_ready() != 1) {
328 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
329 "for secure operations - update keys later when "
330 "the first station connects");
331 }
332
333 /*
334 * Set initial GMK/Counter value here. The actual values that will be
335 * used in negotiations will be set once the first station tries to
336 * connect. This allows more time for collecting additional randomness
337 * on embedded devices.
338 */
339 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
340 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
341 "initialization.");
342 os_free(group);
343 return NULL;
344 }
345
346 group->GInit = TRUE;
347 if (delay_init) {
348 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
349 "until Beacon frames have been configured");
350 /* Initialization is completed in wpa_init_keys(). */
351 } else {
352 wpa_group_sm_step(wpa_auth, group);
353 group->GInit = FALSE;
354 wpa_group_sm_step(wpa_auth, group);
355 }
356
357 return group;
358 }
359
360
361 /**
362 * wpa_init - Initialize WPA authenticator
363 * @addr: Authenticator address
364 * @conf: Configuration for WPA authenticator
365 * @cb: Callback functions for WPA authenticator
366 * Returns: Pointer to WPA authenticator data or %NULL on failure
367 */
368 struct wpa_authenticator * wpa_init(const u8 *addr,
369 struct wpa_auth_config *conf,
370 struct wpa_auth_callbacks *cb)
371 {
372 struct wpa_authenticator *wpa_auth;
373
374 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
375 if (wpa_auth == NULL)
376 return NULL;
377 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
378 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
379 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
380
381 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
382 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
383 os_free(wpa_auth);
384 return NULL;
385 }
386
387 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
388 if (wpa_auth->group == NULL) {
389 os_free(wpa_auth->wpa_ie);
390 os_free(wpa_auth);
391 return NULL;
392 }
393
394 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
395 wpa_auth);
396 if (wpa_auth->pmksa == NULL) {
397 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
398 os_free(wpa_auth->wpa_ie);
399 os_free(wpa_auth);
400 return NULL;
401 }
402
403 #ifdef CONFIG_IEEE80211R
404 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
405 if (wpa_auth->ft_pmk_cache == NULL) {
406 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
407 os_free(wpa_auth->wpa_ie);
408 pmksa_cache_auth_deinit(wpa_auth->pmksa);
409 os_free(wpa_auth);
410 return NULL;
411 }
412 #endif /* CONFIG_IEEE80211R */
413
414 if (wpa_auth->conf.wpa_gmk_rekey) {
415 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
416 wpa_rekey_gmk, wpa_auth, NULL);
417 }
418
419 if (wpa_auth->conf.wpa_group_rekey) {
420 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
421 wpa_rekey_gtk, wpa_auth, NULL);
422 }
423
424 return wpa_auth;
425 }
426
427
428 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
429 {
430 struct wpa_group *group = wpa_auth->group;
431
432 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
433 "keys");
434 wpa_group_sm_step(wpa_auth, group);
435 group->GInit = FALSE;
436 wpa_group_sm_step(wpa_auth, group);
437 return 0;
438 }
439
440
441 /**
442 * wpa_deinit - Deinitialize WPA authenticator
443 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
444 */
445 void wpa_deinit(struct wpa_authenticator *wpa_auth)
446 {
447 struct wpa_group *group, *prev;
448
449 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
450 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
451
452 #ifdef CONFIG_PEERKEY
453 while (wpa_auth->stsl_negotiations)
454 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
455 #endif /* CONFIG_PEERKEY */
456
457 pmksa_cache_auth_deinit(wpa_auth->pmksa);
458
459 #ifdef CONFIG_IEEE80211R
460 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
461 wpa_auth->ft_pmk_cache = NULL;
462 #endif /* CONFIG_IEEE80211R */
463
464 os_free(wpa_auth->wpa_ie);
465
466 group = wpa_auth->group;
467 while (group) {
468 prev = group;
469 group = group->next;
470 os_free(prev);
471 }
472
473 os_free(wpa_auth);
474 }
475
476
477 /**
478 * wpa_reconfig - Update WPA authenticator configuration
479 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
480 * @conf: Configuration for WPA authenticator
481 */
482 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
483 struct wpa_auth_config *conf)
484 {
485 struct wpa_group *group;
486 if (wpa_auth == NULL)
487 return 0;
488
489 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
490 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
491 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
492 return -1;
493 }
494
495 /*
496 * Reinitialize GTK to make sure it is suitable for the new
497 * configuration.
498 */
499 group = wpa_auth->group;
500 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
501 group->GInit = TRUE;
502 wpa_group_sm_step(wpa_auth, group);
503 group->GInit = FALSE;
504 wpa_group_sm_step(wpa_auth, group);
505
506 return 0;
507 }
508
509
510 struct wpa_state_machine *
511 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr)
512 {
513 struct wpa_state_machine *sm;
514
515 sm = os_zalloc(sizeof(struct wpa_state_machine));
516 if (sm == NULL)
517 return NULL;
518 os_memcpy(sm->addr, addr, ETH_ALEN);
519
520 sm->wpa_auth = wpa_auth;
521 sm->group = wpa_auth->group;
522
523 return sm;
524 }
525
526
527 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
528 struct wpa_state_machine *sm)
529 {
530 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
531 return -1;
532
533 #ifdef CONFIG_IEEE80211R
534 if (sm->ft_completed) {
535 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
536 "FT authentication already completed - do not "
537 "start 4-way handshake");
538 return 0;
539 }
540 #endif /* CONFIG_IEEE80211R */
541
542 if (sm->started) {
543 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
544 sm->ReAuthenticationRequest = TRUE;
545 return wpa_sm_step(sm);
546 }
547
548 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
549 "start authentication");
550 sm->started = 1;
551
552 sm->Init = TRUE;
553 if (wpa_sm_step(sm) == 1)
554 return 1; /* should not really happen */
555 sm->Init = FALSE;
556 sm->AuthenticationRequest = TRUE;
557 return wpa_sm_step(sm);
558 }
559
560
561 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
562 {
563 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
564 * reassociates back to the same AP while the previous entry for the
565 * STA has not yet been removed. */
566 if (sm == NULL)
567 return;
568
569 sm->wpa_key_mgmt = 0;
570 }
571
572
573 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
574 {
575 if (sm->GUpdateStationKeys) {
576 sm->group->GKeyDoneStations--;
577 sm->GUpdateStationKeys = FALSE;
578 }
579 #ifdef CONFIG_IEEE80211R
580 os_free(sm->assoc_resp_ftie);
581 #endif /* CONFIG_IEEE80211R */
582 os_free(sm->last_rx_eapol_key);
583 os_free(sm->wpa_ie);
584 os_free(sm);
585 }
586
587
588 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
589 {
590 if (sm == NULL)
591 return;
592
593 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
594 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
595 "strict rekeying - force GTK rekey since STA "
596 "is leaving");
597 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
598 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
599 NULL);
600 }
601
602 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
603 sm->pending_1_of_4_timeout = 0;
604 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
605 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
606 if (sm->in_step_loop) {
607 /* Must not free state machine while wpa_sm_step() is running.
608 * Freeing will be completed in the end of wpa_sm_step(). */
609 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
610 "machine deinit for " MACSTR, MAC2STR(sm->addr));
611 sm->pending_deinit = 1;
612 } else
613 wpa_free_sta_sm(sm);
614 }
615
616
617 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
618 {
619 if (sm == NULL)
620 return;
621
622 sm->PTKRequest = TRUE;
623 sm->PTK_valid = 0;
624 }
625
626
627 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
628 const u8 *replay_counter)
629 {
630 int i;
631 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
632 if (!ctr[i].valid)
633 break;
634 if (os_memcmp(replay_counter, ctr[i].counter,
635 WPA_REPLAY_COUNTER_LEN) == 0)
636 return 1;
637 }
638 return 0;
639 }
640
641
642 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
643 const u8 *replay_counter)
644 {
645 int i;
646 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
647 if (ctr[i].valid &&
648 (replay_counter == NULL ||
649 os_memcmp(replay_counter, ctr[i].counter,
650 WPA_REPLAY_COUNTER_LEN) == 0))
651 ctr[i].valid = FALSE;
652 }
653 }
654
655
656 #ifdef CONFIG_IEEE80211R
657 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
658 struct wpa_state_machine *sm,
659 struct wpa_eapol_ie_parse *kde)
660 {
661 struct wpa_ie_data ie;
662 struct rsn_mdie *mdie;
663
664 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
665 ie.num_pmkid != 1 || ie.pmkid == NULL) {
666 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
667 "FT 4-way handshake message 2/4");
668 return -1;
669 }
670
671 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
672 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
673 sm->sup_pmk_r1_name, PMKID_LEN);
674
675 if (!kde->mdie || !kde->ftie) {
676 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
677 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
678 return -1;
679 }
680
681 mdie = (struct rsn_mdie *) (kde->mdie + 2);
682 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
683 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
684 MOBILITY_DOMAIN_ID_LEN) != 0) {
685 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
686 return -1;
687 }
688
689 if (sm->assoc_resp_ftie &&
690 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
691 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
692 2 + sm->assoc_resp_ftie[1]) != 0)) {
693 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
694 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
695 kde->ftie, kde->ftie_len);
696 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
697 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
698 return -1;
699 }
700
701 return 0;
702 }
703 #endif /* CONFIG_IEEE80211R */
704
705
706 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
707 struct wpa_state_machine *sm, int group)
708 {
709 /* Supplicant reported a Michael MIC error */
710 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
711 "received EAPOL-Key Error Request "
712 "(STA detected Michael MIC failure (group=%d))",
713 group);
714
715 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
716 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
717 "ignore Michael MIC failure report since "
718 "group cipher is not TKIP");
719 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
720 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
721 "ignore Michael MIC failure report since "
722 "pairwise cipher is not TKIP");
723 } else {
724 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
725 return 1; /* STA entry was removed */
726 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
727 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
728 }
729
730 /*
731 * Error report is not a request for a new key handshake, but since
732 * Authenticator may do it, let's change the keys now anyway.
733 */
734 wpa_request_new_ptk(sm);
735 return 0;
736 }
737
738
739 void wpa_receive(struct wpa_authenticator *wpa_auth,
740 struct wpa_state_machine *sm,
741 u8 *data, size_t data_len)
742 {
743 struct ieee802_1x_hdr *hdr;
744 struct wpa_eapol_key *key;
745 u16 key_info, key_data_length;
746 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
747 SMK_M1, SMK_M3, SMK_ERROR } msg;
748 char *msgtxt;
749 struct wpa_eapol_ie_parse kde;
750 int ft;
751 const u8 *eapol_key_ie;
752 size_t eapol_key_ie_len;
753
754 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
755 return;
756
757 if (data_len < sizeof(*hdr) + sizeof(*key))
758 return;
759
760 hdr = (struct ieee802_1x_hdr *) data;
761 key = (struct wpa_eapol_key *) (hdr + 1);
762 key_info = WPA_GET_BE16(key->key_info);
763 key_data_length = WPA_GET_BE16(key->key_data_length);
764 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
765 " key_info=0x%x type=%u key_data_length=%u",
766 MAC2STR(sm->addr), key_info, key->type, key_data_length);
767 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
768 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
769 "key_data overflow (%d > %lu)",
770 key_data_length,
771 (unsigned long) (data_len - sizeof(*hdr) -
772 sizeof(*key)));
773 return;
774 }
775
776 if (sm->wpa == WPA_VERSION_WPA2) {
777 if (key->type == EAPOL_KEY_TYPE_WPA) {
778 /*
779 * Some deployed station implementations seem to send
780 * msg 4/4 with incorrect type value in WPA2 mode.
781 */
782 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
783 "with unexpected WPA type in RSN mode");
784 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
785 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
786 "unexpected type %d in RSN mode",
787 key->type);
788 return;
789 }
790 } else {
791 if (key->type != EAPOL_KEY_TYPE_WPA) {
792 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
793 "unexpected type %d in WPA mode",
794 key->type);
795 return;
796 }
797 }
798
799 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
800 WPA_NONCE_LEN);
801 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
802 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
803
804 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
805 * are set */
806
807 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
808 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
809 if (key_info & WPA_KEY_INFO_ERROR) {
810 msg = SMK_ERROR;
811 msgtxt = "SMK Error";
812 } else {
813 msg = SMK_M1;
814 msgtxt = "SMK M1";
815 }
816 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
817 msg = SMK_M3;
818 msgtxt = "SMK M3";
819 } else if (key_info & WPA_KEY_INFO_REQUEST) {
820 msg = REQUEST;
821 msgtxt = "Request";
822 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
823 msg = GROUP_2;
824 msgtxt = "2/2 Group";
825 } else if (key_data_length == 0) {
826 msg = PAIRWISE_4;
827 msgtxt = "4/4 Pairwise";
828 } else {
829 msg = PAIRWISE_2;
830 msgtxt = "2/4 Pairwise";
831 }
832
833 /* TODO: key_info type validation for PeerKey */
834 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
835 msg == GROUP_2) {
836 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
837 if (sm->pairwise == WPA_CIPHER_CCMP ||
838 sm->pairwise == WPA_CIPHER_GCMP) {
839 if (wpa_use_aes_cmac(sm) &&
840 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
841 wpa_auth_logger(wpa_auth, sm->addr,
842 LOGGER_WARNING,
843 "advertised support for "
844 "AES-128-CMAC, but did not "
845 "use it");
846 return;
847 }
848
849 if (!wpa_use_aes_cmac(sm) &&
850 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
851 wpa_auth_logger(wpa_auth, sm->addr,
852 LOGGER_WARNING,
853 "did not use HMAC-SHA1-AES "
854 "with CCMP/GCMP");
855 return;
856 }
857 }
858 }
859
860 if (key_info & WPA_KEY_INFO_REQUEST) {
861 if (sm->req_replay_counter_used &&
862 os_memcmp(key->replay_counter, sm->req_replay_counter,
863 WPA_REPLAY_COUNTER_LEN) <= 0) {
864 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
865 "received EAPOL-Key request with "
866 "replayed counter");
867 return;
868 }
869 }
870
871 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
872 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
873 int i;
874
875 if (msg == PAIRWISE_2 &&
876 wpa_replay_counter_valid(sm->prev_key_replay,
877 key->replay_counter) &&
878 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
879 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
880 {
881 /*
882 * Some supplicant implementations (e.g., Windows XP
883 * WZC) update SNonce for each EAPOL-Key 2/4. This
884 * breaks the workaround on accepting any of the
885 * pending requests, so allow the SNonce to be updated
886 * even if we have already sent out EAPOL-Key 3/4.
887 */
888 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
889 "Process SNonce update from STA "
890 "based on retransmitted EAPOL-Key "
891 "1/4");
892 sm->update_snonce = 1;
893 wpa_replay_counter_mark_invalid(sm->prev_key_replay,
894 key->replay_counter);
895 goto continue_processing;
896 }
897
898 if (msg == PAIRWISE_2 &&
899 wpa_replay_counter_valid(sm->prev_key_replay,
900 key->replay_counter) &&
901 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
902 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
903 "ignore retransmitted EAPOL-Key %s - "
904 "SNonce did not change", msgtxt);
905 } else {
906 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
907 "received EAPOL-Key %s with "
908 "unexpected replay counter", msgtxt);
909 }
910 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
911 if (!sm->key_replay[i].valid)
912 break;
913 wpa_hexdump(MSG_DEBUG, "pending replay counter",
914 sm->key_replay[i].counter,
915 WPA_REPLAY_COUNTER_LEN);
916 }
917 wpa_hexdump(MSG_DEBUG, "received replay counter",
918 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
919 return;
920 }
921
922 continue_processing:
923 switch (msg) {
924 case PAIRWISE_2:
925 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
926 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
927 (!sm->update_snonce ||
928 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
929 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
930 "received EAPOL-Key msg 2/4 in "
931 "invalid state (%d) - dropped",
932 sm->wpa_ptk_state);
933 return;
934 }
935 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
936 if (sm->group->reject_4way_hs_for_entropy) {
937 /*
938 * The system did not have enough entropy to generate
939 * strong random numbers. Reject the first 4-way
940 * handshake(s) and collect some entropy based on the
941 * information from it. Once enough entropy is
942 * available, the next atempt will trigger GMK/Key
943 * Counter update and the station will be allowed to
944 * continue.
945 */
946 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
947 "collect more entropy for random number "
948 "generation");
949 random_mark_pool_ready();
950 wpa_sta_disconnect(wpa_auth, sm->addr);
951 return;
952 }
953 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
954 &kde) < 0) {
955 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
956 "received EAPOL-Key msg 2/4 with "
957 "invalid Key Data contents");
958 return;
959 }
960 if (kde.rsn_ie) {
961 eapol_key_ie = kde.rsn_ie;
962 eapol_key_ie_len = kde.rsn_ie_len;
963 } else {
964 eapol_key_ie = kde.wpa_ie;
965 eapol_key_ie_len = kde.wpa_ie_len;
966 }
967 ft = sm->wpa == WPA_VERSION_WPA2 &&
968 wpa_key_mgmt_ft(sm->wpa_key_mgmt);
969 if (sm->wpa_ie == NULL ||
970 wpa_compare_rsn_ie(ft,
971 sm->wpa_ie, sm->wpa_ie_len,
972 eapol_key_ie, eapol_key_ie_len)) {
973 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
974 "WPA IE from (Re)AssocReq did not "
975 "match with msg 2/4");
976 if (sm->wpa_ie) {
977 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
978 sm->wpa_ie, sm->wpa_ie_len);
979 }
980 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
981 eapol_key_ie, eapol_key_ie_len);
982 /* MLME-DEAUTHENTICATE.request */
983 wpa_sta_disconnect(wpa_auth, sm->addr);
984 return;
985 }
986 #ifdef CONFIG_IEEE80211R
987 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
988 wpa_sta_disconnect(wpa_auth, sm->addr);
989 return;
990 }
991 #endif /* CONFIG_IEEE80211R */
992 break;
993 case PAIRWISE_4:
994 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
995 !sm->PTK_valid) {
996 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
997 "received EAPOL-Key msg 4/4 in "
998 "invalid state (%d) - dropped",
999 sm->wpa_ptk_state);
1000 return;
1001 }
1002 break;
1003 case GROUP_2:
1004 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1005 || !sm->PTK_valid) {
1006 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1007 "received EAPOL-Key msg 2/2 in "
1008 "invalid state (%d) - dropped",
1009 sm->wpa_ptk_group_state);
1010 return;
1011 }
1012 break;
1013 #ifdef CONFIG_PEERKEY
1014 case SMK_M1:
1015 case SMK_M3:
1016 case SMK_ERROR:
1017 if (!wpa_auth->conf.peerkey) {
1018 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1019 "PeerKey use disabled - ignoring message");
1020 return;
1021 }
1022 if (!sm->PTK_valid) {
1023 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1024 "received EAPOL-Key msg SMK in "
1025 "invalid state - dropped");
1026 return;
1027 }
1028 break;
1029 #else /* CONFIG_PEERKEY */
1030 case SMK_M1:
1031 case SMK_M3:
1032 case SMK_ERROR:
1033 return; /* STSL disabled - ignore SMK messages */
1034 #endif /* CONFIG_PEERKEY */
1035 case REQUEST:
1036 break;
1037 }
1038
1039 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1040 "received EAPOL-Key frame (%s)", msgtxt);
1041
1042 if (key_info & WPA_KEY_INFO_ACK) {
1043 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1044 "received invalid EAPOL-Key: Key Ack set");
1045 return;
1046 }
1047
1048 if (!(key_info & WPA_KEY_INFO_MIC)) {
1049 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1050 "received invalid EAPOL-Key: Key MIC not set");
1051 return;
1052 }
1053
1054 sm->MICVerified = FALSE;
1055 if (sm->PTK_valid && !sm->update_snonce) {
1056 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1057 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1058 "received EAPOL-Key with invalid MIC");
1059 return;
1060 }
1061 sm->MICVerified = TRUE;
1062 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1063 sm->pending_1_of_4_timeout = 0;
1064 }
1065
1066 if (key_info & WPA_KEY_INFO_REQUEST) {
1067 if (sm->MICVerified) {
1068 sm->req_replay_counter_used = 1;
1069 os_memcpy(sm->req_replay_counter, key->replay_counter,
1070 WPA_REPLAY_COUNTER_LEN);
1071 } else {
1072 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1073 "received EAPOL-Key request with "
1074 "invalid MIC");
1075 return;
1076 }
1077
1078 /*
1079 * TODO: should decrypt key data field if encryption was used;
1080 * even though MAC address KDE is not normally encrypted,
1081 * supplicant is allowed to encrypt it.
1082 */
1083 if (msg == SMK_ERROR) {
1084 #ifdef CONFIG_PEERKEY
1085 wpa_smk_error(wpa_auth, sm, key);
1086 #endif /* CONFIG_PEERKEY */
1087 return;
1088 } else if (key_info & WPA_KEY_INFO_ERROR) {
1089 if (wpa_receive_error_report(
1090 wpa_auth, sm,
1091 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1092 return; /* STA entry was removed */
1093 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1094 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1095 "received EAPOL-Key Request for new "
1096 "4-Way Handshake");
1097 wpa_request_new_ptk(sm);
1098 #ifdef CONFIG_PEERKEY
1099 } else if (msg == SMK_M1) {
1100 wpa_smk_m1(wpa_auth, sm, key);
1101 #endif /* CONFIG_PEERKEY */
1102 } else if (key_data_length > 0 &&
1103 wpa_parse_kde_ies((const u8 *) (key + 1),
1104 key_data_length, &kde) == 0 &&
1105 kde.mac_addr) {
1106 } else {
1107 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1108 "received EAPOL-Key Request for GTK "
1109 "rekeying");
1110 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1111 wpa_rekey_gtk(wpa_auth, NULL);
1112 }
1113 } else {
1114 /* Do not allow the same key replay counter to be reused. */
1115 wpa_replay_counter_mark_invalid(sm->key_replay,
1116 key->replay_counter);
1117
1118 if (msg == PAIRWISE_2) {
1119 /*
1120 * Maintain a copy of the pending EAPOL-Key frames in
1121 * case the EAPOL-Key frame was retransmitted. This is
1122 * needed to allow EAPOL-Key msg 2/4 reply to another
1123 * pending msg 1/4 to update the SNonce to work around
1124 * unexpected supplicant behavior.
1125 */
1126 os_memcpy(sm->prev_key_replay, sm->key_replay,
1127 sizeof(sm->key_replay));
1128 } else {
1129 os_memset(sm->prev_key_replay, 0,
1130 sizeof(sm->prev_key_replay));
1131 }
1132
1133 /*
1134 * Make sure old valid counters are not accepted anymore and
1135 * do not get copied again.
1136 */
1137 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1138 }
1139
1140 #ifdef CONFIG_PEERKEY
1141 if (msg == SMK_M3) {
1142 wpa_smk_m3(wpa_auth, sm, key);
1143 return;
1144 }
1145 #endif /* CONFIG_PEERKEY */
1146
1147 os_free(sm->last_rx_eapol_key);
1148 sm->last_rx_eapol_key = os_malloc(data_len);
1149 if (sm->last_rx_eapol_key == NULL)
1150 return;
1151 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1152 sm->last_rx_eapol_key_len = data_len;
1153
1154 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1155 sm->EAPOLKeyReceived = TRUE;
1156 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1157 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1158 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1159 wpa_sm_step(sm);
1160 }
1161
1162
1163 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1164 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1165 {
1166 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1167 u8 *pos;
1168 int ret = 0;
1169
1170 /* GTK = PRF-X(GMK, "Group key expansion",
1171 * AA || GNonce || Time || random data)
1172 * The example described in the IEEE 802.11 standard uses only AA and
1173 * GNonce as inputs here. Add some more entropy since this derivation
1174 * is done only at the Authenticator and as such, does not need to be
1175 * exactly same.
1176 */
1177 os_memcpy(data, addr, ETH_ALEN);
1178 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1179 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1180 wpa_get_ntp_timestamp(pos);
1181 pos += 8;
1182 if (random_get_bytes(pos, 16) < 0)
1183 ret = -1;
1184
1185 #ifdef CONFIG_IEEE80211W
1186 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1187 #else /* CONFIG_IEEE80211W */
1188 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1189 < 0)
1190 ret = -1;
1191 #endif /* CONFIG_IEEE80211W */
1192
1193 return ret;
1194 }
1195
1196
1197 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1198 {
1199 struct wpa_authenticator *wpa_auth = eloop_ctx;
1200 struct wpa_state_machine *sm = timeout_ctx;
1201
1202 sm->pending_1_of_4_timeout = 0;
1203 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1204 sm->TimeoutEvt = TRUE;
1205 wpa_sm_step(sm);
1206 }
1207
1208
1209 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1210 struct wpa_state_machine *sm, int key_info,
1211 const u8 *key_rsc, const u8 *nonce,
1212 const u8 *kde, size_t kde_len,
1213 int keyidx, int encr, int force_version)
1214 {
1215 struct ieee802_1x_hdr *hdr;
1216 struct wpa_eapol_key *key;
1217 size_t len;
1218 int alg;
1219 int key_data_len, pad_len = 0;
1220 u8 *buf, *pos;
1221 int version, pairwise;
1222 int i;
1223
1224 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1225
1226 if (force_version)
1227 version = force_version;
1228 else if (wpa_use_aes_cmac(sm))
1229 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1230 else if (sm->pairwise != WPA_CIPHER_TKIP)
1231 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1232 else
1233 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1234
1235 pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1236
1237 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1238 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1239 "encr=%d)",
1240 version,
1241 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1242 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1243 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1244 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1245 pairwise, (unsigned long) kde_len, keyidx, encr);
1246
1247 key_data_len = kde_len;
1248
1249 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1250 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1251 pad_len = key_data_len % 8;
1252 if (pad_len)
1253 pad_len = 8 - pad_len;
1254 key_data_len += pad_len + 8;
1255 }
1256
1257 len += key_data_len;
1258
1259 hdr = os_zalloc(len);
1260 if (hdr == NULL)
1261 return;
1262 hdr->version = wpa_auth->conf.eapol_version;
1263 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1264 hdr->length = host_to_be16(len - sizeof(*hdr));
1265 key = (struct wpa_eapol_key *) (hdr + 1);
1266
1267 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1268 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1269 key_info |= version;
1270 if (encr && sm->wpa == WPA_VERSION_WPA2)
1271 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1272 if (sm->wpa != WPA_VERSION_WPA2)
1273 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1274 WPA_PUT_BE16(key->key_info, key_info);
1275
1276 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1277 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1278 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1279 WPA_PUT_BE16(key->key_length, 0);
1280
1281 /* FIX: STSL: what to use as key_replay_counter? */
1282 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1283 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1284 os_memcpy(sm->key_replay[i].counter,
1285 sm->key_replay[i - 1].counter,
1286 WPA_REPLAY_COUNTER_LEN);
1287 }
1288 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1289 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1290 WPA_REPLAY_COUNTER_LEN);
1291 sm->key_replay[0].valid = TRUE;
1292
1293 if (nonce)
1294 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1295
1296 if (key_rsc)
1297 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1298
1299 if (kde && !encr) {
1300 os_memcpy(key + 1, kde, kde_len);
1301 WPA_PUT_BE16(key->key_data_length, kde_len);
1302 } else if (encr && kde) {
1303 buf = os_zalloc(key_data_len);
1304 if (buf == NULL) {
1305 os_free(hdr);
1306 return;
1307 }
1308 pos = buf;
1309 os_memcpy(pos, kde, kde_len);
1310 pos += kde_len;
1311
1312 if (pad_len)
1313 *pos++ = 0xdd;
1314
1315 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1316 buf, key_data_len);
1317 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1318 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1319 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1320 (u8 *) (key + 1))) {
1321 os_free(hdr);
1322 os_free(buf);
1323 return;
1324 }
1325 WPA_PUT_BE16(key->key_data_length, key_data_len);
1326 } else {
1327 u8 ek[32];
1328 os_memcpy(key->key_iv,
1329 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1330 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1331 os_memcpy(ek, key->key_iv, 16);
1332 os_memcpy(ek + 16, sm->PTK.kek, 16);
1333 os_memcpy(key + 1, buf, key_data_len);
1334 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1335 WPA_PUT_BE16(key->key_data_length, key_data_len);
1336 }
1337 os_free(buf);
1338 }
1339
1340 if (key_info & WPA_KEY_INFO_MIC) {
1341 if (!sm->PTK_valid) {
1342 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1343 "PTK not valid when sending EAPOL-Key "
1344 "frame");
1345 os_free(hdr);
1346 return;
1347 }
1348 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1349 key->key_mic);
1350 #ifdef CONFIG_TESTING_OPTIONS
1351 if (!pairwise &&
1352 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0d &&
1353 drand48() <
1354 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1355 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1356 "Corrupting group EAPOL-Key Key MIC");
1357 key->key_mic[0]++;
1358 }
1359 #endif /* CONFIG_TESTING_OPTIONS */
1360 }
1361
1362 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1363 1);
1364 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1365 sm->pairwise_set);
1366 os_free(hdr);
1367 }
1368
1369
1370 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1371 struct wpa_state_machine *sm, int key_info,
1372 const u8 *key_rsc, const u8 *nonce,
1373 const u8 *kde, size_t kde_len,
1374 int keyidx, int encr)
1375 {
1376 int timeout_ms;
1377 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1378 int ctr;
1379
1380 if (sm == NULL)
1381 return;
1382
1383 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1384 keyidx, encr, 0);
1385
1386 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1387 if (ctr == 1 && wpa_auth->conf.tx_status)
1388 timeout_ms = pairwise ? eapol_key_timeout_first :
1389 eapol_key_timeout_first_group;
1390 else
1391 timeout_ms = eapol_key_timeout_subseq;
1392 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1393 sm->pending_1_of_4_timeout = 1;
1394 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1395 "counter %d)", timeout_ms, ctr);
1396 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1397 wpa_send_eapol_timeout, wpa_auth, sm);
1398 }
1399
1400
1401 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1402 {
1403 struct ieee802_1x_hdr *hdr;
1404 struct wpa_eapol_key *key;
1405 u16 key_info;
1406 int ret = 0;
1407 u8 mic[16];
1408
1409 if (data_len < sizeof(*hdr) + sizeof(*key))
1410 return -1;
1411
1412 hdr = (struct ieee802_1x_hdr *) data;
1413 key = (struct wpa_eapol_key *) (hdr + 1);
1414 key_info = WPA_GET_BE16(key->key_info);
1415 os_memcpy(mic, key->key_mic, 16);
1416 os_memset(key->key_mic, 0, 16);
1417 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1418 data, data_len, key->key_mic) ||
1419 os_memcmp(mic, key->key_mic, 16) != 0)
1420 ret = -1;
1421 os_memcpy(key->key_mic, mic, 16);
1422 return ret;
1423 }
1424
1425
1426 void wpa_remove_ptk(struct wpa_state_machine *sm)
1427 {
1428 sm->PTK_valid = FALSE;
1429 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1430 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1431 sm->pairwise_set = FALSE;
1432 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1433 }
1434
1435
1436 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1437 {
1438 int remove_ptk = 1;
1439
1440 if (sm == NULL)
1441 return -1;
1442
1443 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1444 "event %d notification", event);
1445
1446 switch (event) {
1447 case WPA_AUTH:
1448 case WPA_ASSOC:
1449 break;
1450 case WPA_DEAUTH:
1451 case WPA_DISASSOC:
1452 sm->DeauthenticationRequest = TRUE;
1453 break;
1454 case WPA_REAUTH:
1455 case WPA_REAUTH_EAPOL:
1456 if (!sm->started) {
1457 /*
1458 * When using WPS, we may end up here if the STA
1459 * manages to re-associate without the previous STA
1460 * entry getting removed. Consequently, we need to make
1461 * sure that the WPA state machines gets initialized
1462 * properly at this point.
1463 */
1464 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1465 "started - initialize now");
1466 sm->started = 1;
1467 sm->Init = TRUE;
1468 if (wpa_sm_step(sm) == 1)
1469 return 1; /* should not really happen */
1470 sm->Init = FALSE;
1471 sm->AuthenticationRequest = TRUE;
1472 break;
1473 }
1474 if (sm->GUpdateStationKeys) {
1475 /*
1476 * Reauthentication cancels the pending group key
1477 * update for this STA.
1478 */
1479 sm->group->GKeyDoneStations--;
1480 sm->GUpdateStationKeys = FALSE;
1481 sm->PtkGroupInit = TRUE;
1482 }
1483 sm->ReAuthenticationRequest = TRUE;
1484 break;
1485 case WPA_ASSOC_FT:
1486 #ifdef CONFIG_IEEE80211R
1487 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1488 "after association");
1489 wpa_ft_install_ptk(sm);
1490
1491 /* Using FT protocol, not WPA auth state machine */
1492 sm->ft_completed = 1;
1493 return 0;
1494 #else /* CONFIG_IEEE80211R */
1495 break;
1496 #endif /* CONFIG_IEEE80211R */
1497 }
1498
1499 #ifdef CONFIG_IEEE80211R
1500 sm->ft_completed = 0;
1501 #endif /* CONFIG_IEEE80211R */
1502
1503 #ifdef CONFIG_IEEE80211W
1504 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1505 remove_ptk = 0;
1506 #endif /* CONFIG_IEEE80211W */
1507
1508 if (remove_ptk) {
1509 sm->PTK_valid = FALSE;
1510 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1511
1512 if (event != WPA_REAUTH_EAPOL)
1513 wpa_remove_ptk(sm);
1514 }
1515
1516 return wpa_sm_step(sm);
1517 }
1518
1519
1520 SM_STATE(WPA_PTK, INITIALIZE)
1521 {
1522 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1523 if (sm->Init) {
1524 /* Init flag is not cleared here, so avoid busy
1525 * loop by claiming nothing changed. */
1526 sm->changed = FALSE;
1527 }
1528
1529 sm->keycount = 0;
1530 if (sm->GUpdateStationKeys)
1531 sm->group->GKeyDoneStations--;
1532 sm->GUpdateStationKeys = FALSE;
1533 if (sm->wpa == WPA_VERSION_WPA)
1534 sm->PInitAKeys = FALSE;
1535 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1536 * Local AA > Remote AA)) */) {
1537 sm->Pair = TRUE;
1538 }
1539 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1540 wpa_remove_ptk(sm);
1541 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1542 sm->TimeoutCtr = 0;
1543 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1544 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1545 WPA_EAPOL_authorized, 0);
1546 }
1547 }
1548
1549
1550 SM_STATE(WPA_PTK, DISCONNECT)
1551 {
1552 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1553 sm->Disconnect = FALSE;
1554 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1555 }
1556
1557
1558 SM_STATE(WPA_PTK, DISCONNECTED)
1559 {
1560 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1561 sm->DeauthenticationRequest = FALSE;
1562 }
1563
1564
1565 SM_STATE(WPA_PTK, AUTHENTICATION)
1566 {
1567 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1568 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1569 sm->PTK_valid = FALSE;
1570 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1571 1);
1572 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1573 sm->AuthenticationRequest = FALSE;
1574 }
1575
1576
1577 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1578 struct wpa_group *group)
1579 {
1580 if (group->first_sta_seen)
1581 return;
1582 /*
1583 * System has run bit further than at the time hostapd was started
1584 * potentially very early during boot up. This provides better chances
1585 * of collecting more randomness on embedded systems. Re-initialize the
1586 * GMK and Counter here to improve their strength if there was not
1587 * enough entropy available immediately after system startup.
1588 */
1589 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1590 "station");
1591 if (random_pool_ready() != 1) {
1592 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1593 "to proceed - reject first 4-way handshake");
1594 group->reject_4way_hs_for_entropy = TRUE;
1595 } else {
1596 group->first_sta_seen = TRUE;
1597 group->reject_4way_hs_for_entropy = FALSE;
1598 }
1599
1600 wpa_group_init_gmk_and_counter(wpa_auth, group);
1601 wpa_gtk_update(wpa_auth, group);
1602 wpa_group_config_group_keys(wpa_auth, group);
1603 }
1604
1605
1606 SM_STATE(WPA_PTK, AUTHENTICATION2)
1607 {
1608 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1609
1610 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1611 sm->ReAuthenticationRequest = FALSE;
1612
1613 /*
1614 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1615 * ambiguous. The Authenticator state machine uses a counter that is
1616 * incremented by one for each 4-way handshake. However, the security
1617 * analysis of 4-way handshake points out that unpredictable nonces
1618 * help in preventing precomputation attacks. Instead of the state
1619 * machine definition, use an unpredictable nonce value here to provide
1620 * stronger protection against potential precomputation attacks.
1621 */
1622 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1623 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1624 "ANonce.");
1625 sm->Disconnect = TRUE;
1626 return;
1627 }
1628 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1629 WPA_NONCE_LEN);
1630 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1631 * logical place than INITIALIZE since AUTHENTICATION2 can be
1632 * re-entered on ReAuthenticationRequest without going through
1633 * INITIALIZE. */
1634 sm->TimeoutCtr = 0;
1635 }
1636
1637
1638 SM_STATE(WPA_PTK, INITPMK)
1639 {
1640 u8 msk[2 * PMK_LEN];
1641 size_t len = 2 * PMK_LEN;
1642
1643 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1644 #ifdef CONFIG_IEEE80211R
1645 sm->xxkey_len = 0;
1646 #endif /* CONFIG_IEEE80211R */
1647 if (sm->pmksa) {
1648 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1649 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1650 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1651 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1652 "(len=%lu)", (unsigned long) len);
1653 os_memcpy(sm->PMK, msk, PMK_LEN);
1654 #ifdef CONFIG_IEEE80211R
1655 if (len >= 2 * PMK_LEN) {
1656 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1657 sm->xxkey_len = PMK_LEN;
1658 }
1659 #endif /* CONFIG_IEEE80211R */
1660 } else {
1661 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1662 }
1663
1664 sm->req_replay_counter_used = 0;
1665 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1666 * will break reauthentication since EAPOL state machines may not be
1667 * get into AUTHENTICATING state that clears keyRun before WPA state
1668 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1669 * state and takes PMK from the previously used AAA Key. This will
1670 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1671 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1672 * be good workaround for this issue. */
1673 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1674 }
1675
1676
1677 SM_STATE(WPA_PTK, INITPSK)
1678 {
1679 const u8 *psk;
1680 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1681 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL);
1682 if (psk) {
1683 os_memcpy(sm->PMK, psk, PMK_LEN);
1684 #ifdef CONFIG_IEEE80211R
1685 os_memcpy(sm->xxkey, psk, PMK_LEN);
1686 sm->xxkey_len = PMK_LEN;
1687 #endif /* CONFIG_IEEE80211R */
1688 }
1689 sm->req_replay_counter_used = 0;
1690 }
1691
1692
1693 SM_STATE(WPA_PTK, PTKSTART)
1694 {
1695 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1696 size_t pmkid_len = 0;
1697
1698 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1699 sm->PTKRequest = FALSE;
1700 sm->TimeoutEvt = FALSE;
1701
1702 sm->TimeoutCtr++;
1703 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1704 /* No point in sending the EAPOL-Key - we will disconnect
1705 * immediately following this. */
1706 return;
1707 }
1708
1709 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1710 "sending 1/4 msg of 4-Way Handshake");
1711 /*
1712 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1713 * one possible PSK for this STA.
1714 */
1715 if (sm->wpa == WPA_VERSION_WPA2 &&
1716 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1717 pmkid = buf;
1718 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1719 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1720 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1721 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1722 if (sm->pmksa)
1723 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1724 sm->pmksa->pmkid, PMKID_LEN);
1725 else {
1726 /*
1727 * Calculate PMKID since no PMKSA cache entry was
1728 * available with pre-calculated PMKID.
1729 */
1730 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1731 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1732 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1733 }
1734 }
1735 wpa_send_eapol(sm->wpa_auth, sm,
1736 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1737 sm->ANonce, pmkid, pmkid_len, 0, 0);
1738 }
1739
1740
1741 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1742 struct wpa_ptk *ptk)
1743 {
1744 size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64;
1745 #ifdef CONFIG_IEEE80211R
1746 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1747 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1748 #endif /* CONFIG_IEEE80211R */
1749
1750 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1751 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1752 (u8 *) ptk, ptk_len,
1753 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1754
1755 return 0;
1756 }
1757
1758
1759 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1760 {
1761 struct wpa_ptk PTK;
1762 int ok = 0;
1763 const u8 *pmk = NULL;
1764
1765 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1766 sm->EAPOLKeyReceived = FALSE;
1767 sm->update_snonce = FALSE;
1768
1769 /* WPA with IEEE 802.1X: use the derived PMK from EAP
1770 * WPA-PSK: iterate through possible PSKs and select the one matching
1771 * the packet */
1772 for (;;) {
1773 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1774 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk);
1775 if (pmk == NULL)
1776 break;
1777 } else
1778 pmk = sm->PMK;
1779
1780 wpa_derive_ptk(sm, pmk, &PTK);
1781
1782 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1783 sm->last_rx_eapol_key_len) == 0) {
1784 ok = 1;
1785 break;
1786 }
1787
1788 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1789 break;
1790 }
1791
1792 if (!ok) {
1793 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1794 "invalid MIC in msg 2/4 of 4-Way Handshake");
1795 return;
1796 }
1797
1798 #ifdef CONFIG_IEEE80211R
1799 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1800 /*
1801 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1802 * with the value we derived.
1803 */
1804 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1805 WPA_PMK_NAME_LEN) != 0) {
1806 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1807 "PMKR1Name mismatch in FT 4-way "
1808 "handshake");
1809 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1810 "Supplicant",
1811 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1812 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1813 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1814 return;
1815 }
1816 }
1817 #endif /* CONFIG_IEEE80211R */
1818
1819 sm->pending_1_of_4_timeout = 0;
1820 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1821
1822 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1823 /* PSK may have changed from the previous choice, so update
1824 * state machine data based on whatever PSK was selected here.
1825 */
1826 os_memcpy(sm->PMK, pmk, PMK_LEN);
1827 }
1828
1829 sm->MICVerified = TRUE;
1830
1831 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1832 sm->PTK_valid = TRUE;
1833 }
1834
1835
1836 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1837 {
1838 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1839 sm->TimeoutCtr = 0;
1840 }
1841
1842
1843 #ifdef CONFIG_IEEE80211W
1844
1845 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1846 {
1847 if (sm->mgmt_frame_prot) {
1848 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1849 }
1850
1851 return 0;
1852 }
1853
1854
1855 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1856 {
1857 struct wpa_igtk_kde igtk;
1858 struct wpa_group *gsm = sm->group;
1859
1860 if (!sm->mgmt_frame_prot)
1861 return pos;
1862
1863 igtk.keyid[0] = gsm->GN_igtk;
1864 igtk.keyid[1] = 0;
1865 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1866 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0)
1867 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1868 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1869 if (sm->wpa_auth->conf.disable_gtk) {
1870 /*
1871 * Provide unique random IGTK to each STA to prevent use of
1872 * IGTK in the BSS.
1873 */
1874 if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0)
1875 return pos;
1876 }
1877 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1878 (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1879
1880 return pos;
1881 }
1882
1883 #else /* CONFIG_IEEE80211W */
1884
1885 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1886 {
1887 return 0;
1888 }
1889
1890
1891 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1892 {
1893 return pos;
1894 }
1895
1896 #endif /* CONFIG_IEEE80211W */
1897
1898
1899 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1900 {
1901 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1902 size_t gtk_len, kde_len;
1903 struct wpa_group *gsm = sm->group;
1904 u8 *wpa_ie;
1905 int wpa_ie_len, secure, keyidx, encr = 0;
1906
1907 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1908 sm->TimeoutEvt = FALSE;
1909
1910 sm->TimeoutCtr++;
1911 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1912 /* No point in sending the EAPOL-Key - we will disconnect
1913 * immediately following this. */
1914 return;
1915 }
1916
1917 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1918 GTK[GN], IGTK, [FTIE], [TIE * 2])
1919 */
1920 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1921 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1922 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1923 wpa_ie = sm->wpa_auth->wpa_ie;
1924 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1925 if (sm->wpa == WPA_VERSION_WPA &&
1926 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1927 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1928 /* WPA-only STA, remove RSN IE */
1929 wpa_ie = wpa_ie + wpa_ie[1] + 2;
1930 wpa_ie_len = wpa_ie[1] + 2;
1931 }
1932 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1933 "sending 3/4 msg of 4-Way Handshake");
1934 if (sm->wpa == WPA_VERSION_WPA2) {
1935 /* WPA2 send GTK in the 4-way handshake */
1936 secure = 1;
1937 gtk = gsm->GTK[gsm->GN - 1];
1938 gtk_len = gsm->GTK_len;
1939 if (sm->wpa_auth->conf.disable_gtk) {
1940 /*
1941 * Provide unique random GTK to each STA to prevent use
1942 * of GTK in the BSS.
1943 */
1944 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
1945 return;
1946 gtk = dummy_gtk;
1947 }
1948 keyidx = gsm->GN;
1949 _rsc = rsc;
1950 encr = 1;
1951 } else {
1952 /* WPA does not include GTK in msg 3/4 */
1953 secure = 0;
1954 gtk = NULL;
1955 gtk_len = 0;
1956 keyidx = 0;
1957 _rsc = NULL;
1958 if (sm->rx_eapol_key_secure) {
1959 /*
1960 * It looks like Windows 7 supplicant tries to use
1961 * Secure bit in msg 2/4 after having reported Michael
1962 * MIC failure and it then rejects the 4-way handshake
1963 * if msg 3/4 does not set Secure bit. Work around this
1964 * by setting the Secure bit here even in the case of
1965 * WPA if the supplicant used it first.
1966 */
1967 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1968 "STA used Secure bit in WPA msg 2/4 - "
1969 "set Secure for 3/4 as workaround");
1970 secure = 1;
1971 }
1972 }
1973
1974 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
1975 if (gtk)
1976 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
1977 #ifdef CONFIG_IEEE80211R
1978 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1979 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
1980 kde_len += 300; /* FTIE + 2 * TIE */
1981 }
1982 #endif /* CONFIG_IEEE80211R */
1983 kde = os_malloc(kde_len);
1984 if (kde == NULL)
1985 return;
1986
1987 pos = kde;
1988 os_memcpy(pos, wpa_ie, wpa_ie_len);
1989 pos += wpa_ie_len;
1990 #ifdef CONFIG_IEEE80211R
1991 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1992 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
1993 if (res < 0) {
1994 wpa_printf(MSG_ERROR, "FT: Failed to insert "
1995 "PMKR1Name into RSN IE in EAPOL-Key data");
1996 os_free(kde);
1997 return;
1998 }
1999 pos += res;
2000 }
2001 #endif /* CONFIG_IEEE80211R */
2002 if (gtk) {
2003 u8 hdr[2];
2004 hdr[0] = keyidx & 0x03;
2005 hdr[1] = 0;
2006 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2007 gtk, gtk_len);
2008 }
2009 pos = ieee80211w_kde_add(sm, pos);
2010
2011 #ifdef CONFIG_IEEE80211R
2012 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2013 int res;
2014 struct wpa_auth_config *conf;
2015
2016 conf = &sm->wpa_auth->conf;
2017 res = wpa_write_ftie(conf, conf->r0_key_holder,
2018 conf->r0_key_holder_len,
2019 NULL, NULL, pos, kde + kde_len - pos,
2020 NULL, 0);
2021 if (res < 0) {
2022 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2023 "into EAPOL-Key Key Data");
2024 os_free(kde);
2025 return;
2026 }
2027 pos += res;
2028
2029 /* TIE[ReassociationDeadline] (TU) */
2030 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2031 *pos++ = 5;
2032 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2033 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2034 pos += 4;
2035
2036 /* TIE[KeyLifetime] (seconds) */
2037 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2038 *pos++ = 5;
2039 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2040 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2041 pos += 4;
2042 }
2043 #endif /* CONFIG_IEEE80211R */
2044
2045 wpa_send_eapol(sm->wpa_auth, sm,
2046 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2047 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2048 WPA_KEY_INFO_KEY_TYPE,
2049 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2050 os_free(kde);
2051 }
2052
2053
2054 SM_STATE(WPA_PTK, PTKINITDONE)
2055 {
2056 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2057 sm->EAPOLKeyReceived = FALSE;
2058 if (sm->Pair) {
2059 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2060 int klen = wpa_cipher_key_len(sm->pairwise);
2061 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2062 sm->PTK.tk1, klen)) {
2063 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2064 return;
2065 }
2066 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2067 sm->pairwise_set = TRUE;
2068
2069 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2070 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2071 eloop_register_timeout(sm->wpa_auth->conf.
2072 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2073 sm->wpa_auth, sm);
2074 }
2075
2076 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2077 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2078 WPA_EAPOL_authorized, 1);
2079 }
2080 }
2081
2082 if (0 /* IBSS == TRUE */) {
2083 sm->keycount++;
2084 if (sm->keycount == 2) {
2085 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2086 WPA_EAPOL_portValid, 1);
2087 }
2088 } else {
2089 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2090 1);
2091 }
2092 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2093 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2094 if (sm->wpa == WPA_VERSION_WPA)
2095 sm->PInitAKeys = TRUE;
2096 else
2097 sm->has_GTK = TRUE;
2098 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2099 "pairwise key handshake completed (%s)",
2100 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2101
2102 #ifdef CONFIG_IEEE80211R
2103 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2104 #endif /* CONFIG_IEEE80211R */
2105 }
2106
2107
2108 SM_STEP(WPA_PTK)
2109 {
2110 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2111
2112 if (sm->Init)
2113 SM_ENTER(WPA_PTK, INITIALIZE);
2114 else if (sm->Disconnect
2115 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2116 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2117 "WPA_PTK: sm->Disconnect");
2118 SM_ENTER(WPA_PTK, DISCONNECT);
2119 }
2120 else if (sm->DeauthenticationRequest)
2121 SM_ENTER(WPA_PTK, DISCONNECTED);
2122 else if (sm->AuthenticationRequest)
2123 SM_ENTER(WPA_PTK, AUTHENTICATION);
2124 else if (sm->ReAuthenticationRequest)
2125 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2126 else if (sm->PTKRequest)
2127 SM_ENTER(WPA_PTK, PTKSTART);
2128 else switch (sm->wpa_ptk_state) {
2129 case WPA_PTK_INITIALIZE:
2130 break;
2131 case WPA_PTK_DISCONNECT:
2132 SM_ENTER(WPA_PTK, DISCONNECTED);
2133 break;
2134 case WPA_PTK_DISCONNECTED:
2135 SM_ENTER(WPA_PTK, INITIALIZE);
2136 break;
2137 case WPA_PTK_AUTHENTICATION:
2138 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2139 break;
2140 case WPA_PTK_AUTHENTICATION2:
2141 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2142 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2143 WPA_EAPOL_keyRun) > 0)
2144 SM_ENTER(WPA_PTK, INITPMK);
2145 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2146 /* FIX: && 802.1X::keyRun */)
2147 SM_ENTER(WPA_PTK, INITPSK);
2148 break;
2149 case WPA_PTK_INITPMK:
2150 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2151 WPA_EAPOL_keyAvailable) > 0)
2152 SM_ENTER(WPA_PTK, PTKSTART);
2153 else {
2154 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2155 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2156 "INITPMK - keyAvailable = false");
2157 SM_ENTER(WPA_PTK, DISCONNECT);
2158 }
2159 break;
2160 case WPA_PTK_INITPSK:
2161 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL))
2162 SM_ENTER(WPA_PTK, PTKSTART);
2163 else {
2164 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2165 "no PSK configured for the STA");
2166 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2167 SM_ENTER(WPA_PTK, DISCONNECT);
2168 }
2169 break;
2170 case WPA_PTK_PTKSTART:
2171 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2172 sm->EAPOLKeyPairwise)
2173 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2174 else if (sm->TimeoutCtr >
2175 (int) dot11RSNAConfigPairwiseUpdateCount) {
2176 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2177 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2178 "PTKSTART: Retry limit %d reached",
2179 dot11RSNAConfigPairwiseUpdateCount);
2180 SM_ENTER(WPA_PTK, DISCONNECT);
2181 } else if (sm->TimeoutEvt)
2182 SM_ENTER(WPA_PTK, PTKSTART);
2183 break;
2184 case WPA_PTK_PTKCALCNEGOTIATING:
2185 if (sm->MICVerified)
2186 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2187 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2188 sm->EAPOLKeyPairwise)
2189 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2190 else if (sm->TimeoutEvt)
2191 SM_ENTER(WPA_PTK, PTKSTART);
2192 break;
2193 case WPA_PTK_PTKCALCNEGOTIATING2:
2194 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2195 break;
2196 case WPA_PTK_PTKINITNEGOTIATING:
2197 if (sm->update_snonce)
2198 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2199 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2200 sm->EAPOLKeyPairwise && sm->MICVerified)
2201 SM_ENTER(WPA_PTK, PTKINITDONE);
2202 else if (sm->TimeoutCtr >
2203 (int) dot11RSNAConfigPairwiseUpdateCount) {
2204 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2205 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2206 "PTKINITNEGOTIATING: Retry limit %d "
2207 "reached",
2208 dot11RSNAConfigPairwiseUpdateCount);
2209 SM_ENTER(WPA_PTK, DISCONNECT);
2210 } else if (sm->TimeoutEvt)
2211 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2212 break;
2213 case WPA_PTK_PTKINITDONE:
2214 break;
2215 }
2216 }
2217
2218
2219 SM_STATE(WPA_PTK_GROUP, IDLE)
2220 {
2221 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2222 if (sm->Init) {
2223 /* Init flag is not cleared here, so avoid busy
2224 * loop by claiming nothing changed. */
2225 sm->changed = FALSE;
2226 }
2227 sm->GTimeoutCtr = 0;
2228 }
2229
2230
2231 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2232 {
2233 u8 rsc[WPA_KEY_RSC_LEN];
2234 struct wpa_group *gsm = sm->group;
2235 u8 *kde, *pos, hdr[2];
2236 size_t kde_len;
2237 u8 *gtk, dummy_gtk[32];
2238
2239 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2240
2241 sm->GTimeoutCtr++;
2242 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2243 /* No point in sending the EAPOL-Key - we will disconnect
2244 * immediately following this. */
2245 return;
2246 }
2247
2248 if (sm->wpa == WPA_VERSION_WPA)
2249 sm->PInitAKeys = FALSE;
2250 sm->TimeoutEvt = FALSE;
2251 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2252 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2253 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2254 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2255 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2256 "sending 1/2 msg of Group Key Handshake");
2257
2258 gtk = gsm->GTK[gsm->GN - 1];
2259 if (sm->wpa_auth->conf.disable_gtk) {
2260 /*
2261 * Provide unique random GTK to each STA to prevent use
2262 * of GTK in the BSS.
2263 */
2264 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2265 return;
2266 gtk = dummy_gtk;
2267 }
2268 if (sm->wpa == WPA_VERSION_WPA2) {
2269 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2270 ieee80211w_kde_len(sm);
2271 kde = os_malloc(kde_len);
2272 if (kde == NULL)
2273 return;
2274
2275 pos = kde;
2276 hdr[0] = gsm->GN & 0x03;
2277 hdr[1] = 0;
2278 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2279 gtk, gsm->GTK_len);
2280 pos = ieee80211w_kde_add(sm, pos);
2281 } else {
2282 kde = gtk;
2283 pos = kde + gsm->GTK_len;
2284 }
2285
2286 wpa_send_eapol(sm->wpa_auth, sm,
2287 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2288 WPA_KEY_INFO_ACK |
2289 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2290 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2291 if (sm->wpa == WPA_VERSION_WPA2)
2292 os_free(kde);
2293 }
2294
2295
2296 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2297 {
2298 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2299 sm->EAPOLKeyReceived = FALSE;
2300 if (sm->GUpdateStationKeys)
2301 sm->group->GKeyDoneStations--;
2302 sm->GUpdateStationKeys = FALSE;
2303 sm->GTimeoutCtr = 0;
2304 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2305 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2306 "group key handshake completed (%s)",
2307 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2308 sm->has_GTK = TRUE;
2309 }
2310
2311
2312 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2313 {
2314 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2315 if (sm->GUpdateStationKeys)
2316 sm->group->GKeyDoneStations--;
2317 sm->GUpdateStationKeys = FALSE;
2318 sm->Disconnect = TRUE;
2319 }
2320
2321
2322 SM_STEP(WPA_PTK_GROUP)
2323 {
2324 if (sm->Init || sm->PtkGroupInit) {
2325 SM_ENTER(WPA_PTK_GROUP, IDLE);
2326 sm->PtkGroupInit = FALSE;
2327 } else switch (sm->wpa_ptk_group_state) {
2328 case WPA_PTK_GROUP_IDLE:
2329 if (sm->GUpdateStationKeys ||
2330 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2331 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2332 break;
2333 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2334 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2335 !sm->EAPOLKeyPairwise && sm->MICVerified)
2336 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2337 else if (sm->GTimeoutCtr >
2338 (int) dot11RSNAConfigGroupUpdateCount)
2339 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2340 else if (sm->TimeoutEvt)
2341 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2342 break;
2343 case WPA_PTK_GROUP_KEYERROR:
2344 SM_ENTER(WPA_PTK_GROUP, IDLE);
2345 break;
2346 case WPA_PTK_GROUP_REKEYESTABLISHED:
2347 SM_ENTER(WPA_PTK_GROUP, IDLE);
2348 break;
2349 }
2350 }
2351
2352
2353 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2354 struct wpa_group *group)
2355 {
2356 int ret = 0;
2357
2358 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2359 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2360 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2361 wpa_auth->addr, group->GNonce,
2362 group->GTK[group->GN - 1], group->GTK_len) < 0)
2363 ret = -1;
2364 wpa_hexdump_key(MSG_DEBUG, "GTK",
2365 group->GTK[group->GN - 1], group->GTK_len);
2366
2367 #ifdef CONFIG_IEEE80211W
2368 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2369 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2370 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2371 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2372 wpa_auth->addr, group->GNonce,
2373 group->IGTK[group->GN_igtk - 4],
2374 WPA_IGTK_LEN) < 0)
2375 ret = -1;
2376 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2377 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2378 }
2379 #endif /* CONFIG_IEEE80211W */
2380
2381 return ret;
2382 }
2383
2384
2385 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2386 struct wpa_group *group)
2387 {
2388 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2389 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2390 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2391 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2392
2393 /* GTK[0..N] = 0 */
2394 os_memset(group->GTK, 0, sizeof(group->GTK));
2395 group->GN = 1;
2396 group->GM = 2;
2397 #ifdef CONFIG_IEEE80211W
2398 group->GN_igtk = 4;
2399 group->GM_igtk = 5;
2400 #endif /* CONFIG_IEEE80211W */
2401 /* GTK[GN] = CalcGTK() */
2402 wpa_gtk_update(wpa_auth, group);
2403 }
2404
2405
2406 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2407 {
2408 if (ctx != NULL && ctx != sm->group)
2409 return 0;
2410
2411 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2412 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2413 "Not in PTKINITDONE; skip Group Key update");
2414 sm->GUpdateStationKeys = FALSE;
2415 return 0;
2416 }
2417 if (sm->GUpdateStationKeys) {
2418 /*
2419 * This should not really happen, so add a debug log entry.
2420 * Since we clear the GKeyDoneStations before the loop, the
2421 * station needs to be counted here anyway.
2422 */
2423 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2424 "GUpdateStationKeys was already set when "
2425 "marking station for GTK rekeying");
2426 }
2427
2428 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2429 if (sm->is_wnmsleep)
2430 return 0;
2431
2432 sm->group->GKeyDoneStations++;
2433 sm->GUpdateStationKeys = TRUE;
2434
2435 wpa_sm_step(sm);
2436 return 0;
2437 }
2438
2439
2440 #ifdef CONFIG_WNM
2441 /* update GTK when exiting WNM-Sleep Mode */
2442 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2443 {
2444 if (sm->is_wnmsleep)
2445 return;
2446
2447 wpa_group_update_sta(sm, NULL);
2448 }
2449
2450
2451 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2452 {
2453 sm->is_wnmsleep = !!flag;
2454 }
2455
2456
2457 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2458 {
2459 struct wpa_group *gsm = sm->group;
2460 u8 *start = pos;
2461
2462 /*
2463 * GTK subelement:
2464 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2465 * Key[5..32]
2466 */
2467 *pos++ = WNM_SLEEP_SUBELEM_GTK;
2468 *pos++ = 11 + gsm->GTK_len;
2469 /* Key ID in B0-B1 of Key Info */
2470 WPA_PUT_LE16(pos, gsm->GN & 0x03);
2471 pos += 2;
2472 *pos++ = gsm->GTK_len;
2473 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2474 return 0;
2475 pos += 8;
2476 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2477 pos += gsm->GTK_len;
2478
2479 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2480 gsm->GN);
2481 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2482 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2483
2484 return pos - start;
2485 }
2486
2487
2488 #ifdef CONFIG_IEEE80211W
2489 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2490 {
2491 struct wpa_group *gsm = sm->group;
2492 u8 *start = pos;
2493
2494 /*
2495 * IGTK subelement:
2496 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2497 */
2498 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2499 *pos++ = 2 + 6 + WPA_IGTK_LEN;
2500 WPA_PUT_LE16(pos, gsm->GN_igtk);
2501 pos += 2;
2502 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2503 return 0;
2504 pos += 6;
2505
2506 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2507 pos += WPA_IGTK_LEN;
2508
2509 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2510 gsm->GN_igtk);
2511 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2512 gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2513
2514 return pos - start;
2515 }
2516 #endif /* CONFIG_IEEE80211W */
2517 #endif /* CONFIG_WNM */
2518
2519
2520 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2521 struct wpa_group *group)
2522 {
2523 int tmp;
2524
2525 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2526 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2527 group->changed = TRUE;
2528 group->wpa_group_state = WPA_GROUP_SETKEYS;
2529 group->GTKReKey = FALSE;
2530 tmp = group->GM;
2531 group->GM = group->GN;
2532 group->GN = tmp;
2533 #ifdef CONFIG_IEEE80211W
2534 tmp = group->GM_igtk;
2535 group->GM_igtk = group->GN_igtk;
2536 group->GN_igtk = tmp;
2537 #endif /* CONFIG_IEEE80211W */
2538 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2539 * counting the STAs that are marked with GUpdateStationKeys instead of
2540 * including all STAs that could be in not-yet-completed state. */
2541 wpa_gtk_update(wpa_auth, group);
2542
2543 if (group->GKeyDoneStations) {
2544 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2545 "GKeyDoneStations=%d when starting new GTK rekey",
2546 group->GKeyDoneStations);
2547 group->GKeyDoneStations = 0;
2548 }
2549 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2550 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2551 group->GKeyDoneStations);
2552 }
2553
2554
2555 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2556 struct wpa_group *group)
2557 {
2558 int ret = 0;
2559
2560 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2561 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2562 broadcast_ether_addr, group->GN,
2563 group->GTK[group->GN - 1], group->GTK_len) < 0)
2564 ret = -1;
2565
2566 #ifdef CONFIG_IEEE80211W
2567 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2568 wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2569 broadcast_ether_addr, group->GN_igtk,
2570 group->IGTK[group->GN_igtk - 4],
2571 WPA_IGTK_LEN) < 0)
2572 ret = -1;
2573 #endif /* CONFIG_IEEE80211W */
2574
2575 return ret;
2576 }
2577
2578
2579 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2580 struct wpa_group *group)
2581 {
2582 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2583 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2584 group->changed = TRUE;
2585 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2586
2587 if (wpa_group_config_group_keys(wpa_auth, group) < 0)
2588 return -1;
2589
2590 return 0;
2591 }
2592
2593
2594 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2595 struct wpa_group *group)
2596 {
2597 if (group->GInit) {
2598 wpa_group_gtk_init(wpa_auth, group);
2599 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2600 group->GTKAuthenticator) {
2601 wpa_group_setkeysdone(wpa_auth, group);
2602 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2603 group->GTKReKey) {
2604 wpa_group_setkeys(wpa_auth, group);
2605 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2606 if (group->GKeyDoneStations == 0)
2607 wpa_group_setkeysdone(wpa_auth, group);
2608 else if (group->GTKReKey)
2609 wpa_group_setkeys(wpa_auth, group);
2610 }
2611 }
2612
2613
2614 static int wpa_sm_step(struct wpa_state_machine *sm)
2615 {
2616 if (sm == NULL)
2617 return 0;
2618
2619 if (sm->in_step_loop) {
2620 /* This should not happen, but if it does, make sure we do not
2621 * end up freeing the state machine too early by exiting the
2622 * recursive call. */
2623 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2624 return 0;
2625 }
2626
2627 sm->in_step_loop = 1;
2628 do {
2629 if (sm->pending_deinit)
2630 break;
2631
2632 sm->changed = FALSE;
2633 sm->wpa_auth->group->changed = FALSE;
2634
2635 SM_STEP_RUN(WPA_PTK);
2636 if (sm->pending_deinit)
2637 break;
2638 SM_STEP_RUN(WPA_PTK_GROUP);
2639 if (sm->pending_deinit)
2640 break;
2641 wpa_group_sm_step(sm->wpa_auth, sm->group);
2642 } while (sm->changed || sm->wpa_auth->group->changed);
2643 sm->in_step_loop = 0;
2644
2645 if (sm->pending_deinit) {
2646 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2647 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2648 wpa_free_sta_sm(sm);
2649 return 1;
2650 }
2651 return 0;
2652 }
2653
2654
2655 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2656 {
2657 struct wpa_state_machine *sm = eloop_ctx;
2658 wpa_sm_step(sm);
2659 }
2660
2661
2662 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2663 {
2664 if (sm == NULL)
2665 return;
2666 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2667 }
2668
2669
2670 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2671 {
2672 int tmp, i;
2673 struct wpa_group *group;
2674
2675 if (wpa_auth == NULL)
2676 return;
2677
2678 group = wpa_auth->group;
2679
2680 for (i = 0; i < 2; i++) {
2681 tmp = group->GM;
2682 group->GM = group->GN;
2683 group->GN = tmp;
2684 #ifdef CONFIG_IEEE80211W
2685 tmp = group->GM_igtk;
2686 group->GM_igtk = group->GN_igtk;
2687 group->GN_igtk = tmp;
2688 #endif /* CONFIG_IEEE80211W */
2689 wpa_gtk_update(wpa_auth, group);
2690 wpa_group_config_group_keys(wpa_auth, group);
2691 }
2692 }
2693
2694
2695 static const char * wpa_bool_txt(int bool)
2696 {
2697 return bool ? "TRUE" : "FALSE";
2698 }
2699
2700
2701 #define RSN_SUITE "%02x-%02x-%02x-%d"
2702 #define RSN_SUITE_ARG(s) \
2703 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2704
2705 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2706 {
2707 int len = 0, ret;
2708 char pmkid_txt[PMKID_LEN * 2 + 1];
2709 #ifdef CONFIG_RSN_PREAUTH
2710 const int preauth = 1;
2711 #else /* CONFIG_RSN_PREAUTH */
2712 const int preauth = 0;
2713 #endif /* CONFIG_RSN_PREAUTH */
2714
2715 if (wpa_auth == NULL)
2716 return len;
2717
2718 ret = os_snprintf(buf + len, buflen - len,
2719 "dot11RSNAOptionImplemented=TRUE\n"
2720 "dot11RSNAPreauthenticationImplemented=%s\n"
2721 "dot11RSNAEnabled=%s\n"
2722 "dot11RSNAPreauthenticationEnabled=%s\n",
2723 wpa_bool_txt(preauth),
2724 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2725 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2726 if (ret < 0 || (size_t) ret >= buflen - len)
2727 return len;
2728 len += ret;
2729
2730 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2731 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2732
2733 ret = os_snprintf(
2734 buf + len, buflen - len,
2735 "dot11RSNAConfigVersion=%u\n"
2736 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2737 /* FIX: dot11RSNAConfigGroupCipher */
2738 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2739 /* FIX: dot11RSNAConfigGroupRekeyTime */
2740 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2741 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2742 "dot11RSNAConfigGroupUpdateCount=%u\n"
2743 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2744 "dot11RSNAConfigGroupCipherSize=%u\n"
2745 "dot11RSNAConfigPMKLifetime=%u\n"
2746 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2747 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2748 "dot11RSNAConfigSATimeout=%u\n"
2749 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2750 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2751 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2752 "dot11RSNAPMKIDUsed=%s\n"
2753 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2754 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2755 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2756 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2757 "dot11RSNA4WayHandshakeFailures=%u\n"
2758 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2759 RSN_VERSION,
2760 !!wpa_auth->conf.wpa_strict_rekey,
2761 dot11RSNAConfigGroupUpdateCount,
2762 dot11RSNAConfigPairwiseUpdateCount,
2763 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2764 dot11RSNAConfigPMKLifetime,
2765 dot11RSNAConfigPMKReauthThreshold,
2766 dot11RSNAConfigSATimeout,
2767 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2768 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2769 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2770 pmkid_txt,
2771 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2772 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2773 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2774 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2775 wpa_auth->dot11RSNA4WayHandshakeFailures);
2776 if (ret < 0 || (size_t) ret >= buflen - len)
2777 return len;
2778 len += ret;
2779
2780 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2781 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2782
2783 /* Private MIB */
2784 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2785 wpa_auth->group->wpa_group_state);
2786 if (ret < 0 || (size_t) ret >= buflen - len)
2787 return len;
2788 len += ret;
2789
2790 return len;
2791 }
2792
2793
2794 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2795 {
2796 int len = 0, ret;
2797 u32 pairwise = 0;
2798
2799 if (sm == NULL)
2800 return 0;
2801
2802 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2803
2804 /* dot11RSNAStatsEntry */
2805
2806 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2807 WPA_PROTO_RSN : WPA_PROTO_WPA,
2808 sm->pairwise);
2809 if (pairwise == 0)
2810 return 0;
2811
2812 ret = os_snprintf(
2813 buf + len, buflen - len,
2814 /* TODO: dot11RSNAStatsIndex */
2815 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2816 "dot11RSNAStatsVersion=1\n"
2817 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2818 /* TODO: dot11RSNAStatsTKIPICVErrors */
2819 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2820 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2821 /* TODO: dot11RSNAStatsCCMPReplays */
2822 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2823 /* TODO: dot11RSNAStatsTKIPReplays */,
2824 MAC2STR(sm->addr),
2825 RSN_SUITE_ARG(pairwise),
2826 sm->dot11RSNAStatsTKIPLocalMICFailures,
2827 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2828 if (ret < 0 || (size_t) ret >= buflen - len)
2829 return len;
2830 len += ret;
2831
2832 /* Private MIB */
2833 ret = os_snprintf(buf + len, buflen - len,
2834 "hostapdWPAPTKState=%d\n"
2835 "hostapdWPAPTKGroupState=%d\n",
2836 sm->wpa_ptk_state,
2837 sm->wpa_ptk_group_state);
2838 if (ret < 0 || (size_t) ret >= buflen - len)
2839 return len;
2840 len += ret;
2841
2842 return len;
2843 }
2844
2845
2846 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2847 {
2848 if (wpa_auth)
2849 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2850 }
2851
2852
2853 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2854 {
2855 return sm && sm->pairwise_set;
2856 }
2857
2858
2859 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2860 {
2861 return sm->pairwise;
2862 }
2863
2864
2865 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2866 {
2867 if (sm == NULL)
2868 return -1;
2869 return sm->wpa_key_mgmt;
2870 }
2871
2872
2873 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2874 {
2875 if (sm == NULL)
2876 return 0;
2877 return sm->wpa;
2878 }
2879
2880
2881 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2882 struct rsn_pmksa_cache_entry *entry)
2883 {
2884 if (sm == NULL || sm->pmksa != entry)
2885 return -1;
2886 sm->pmksa = NULL;
2887 return 0;
2888 }
2889
2890
2891 struct rsn_pmksa_cache_entry *
2892 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
2893 {
2894 return sm ? sm->pmksa : NULL;
2895 }
2896
2897
2898 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
2899 {
2900 if (sm)
2901 sm->dot11RSNAStatsTKIPLocalMICFailures++;
2902 }
2903
2904
2905 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
2906 {
2907 if (wpa_auth == NULL)
2908 return NULL;
2909 *len = wpa_auth->wpa_ie_len;
2910 return wpa_auth->wpa_ie;
2911 }
2912
2913
2914 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
2915 int session_timeout, struct eapol_state_machine *eapol)
2916 {
2917 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
2918 sm->wpa_auth->conf.disable_pmksa_caching)
2919 return -1;
2920
2921 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
2922 sm->wpa_auth->addr, sm->addr, session_timeout,
2923 eapol, sm->wpa_key_mgmt))
2924 return 0;
2925
2926 return -1;
2927 }
2928
2929
2930 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
2931 const u8 *pmk, size_t len, const u8 *sta_addr,
2932 int session_timeout,
2933 struct eapol_state_machine *eapol)
2934 {
2935 if (wpa_auth == NULL)
2936 return -1;
2937
2938 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
2939 sta_addr, session_timeout, eapol,
2940 WPA_KEY_MGMT_IEEE8021X))
2941 return 0;
2942
2943 return -1;
2944 }
2945
2946
2947 static struct wpa_group *
2948 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
2949 {
2950 struct wpa_group *group;
2951
2952 if (wpa_auth == NULL || wpa_auth->group == NULL)
2953 return NULL;
2954
2955 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
2956 vlan_id);
2957 group = wpa_group_init(wpa_auth, vlan_id, 0);
2958 if (group == NULL)
2959 return NULL;
2960
2961 group->next = wpa_auth->group->next;
2962 wpa_auth->group->next = group;
2963
2964 return group;
2965 }
2966
2967
2968 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
2969 {
2970 struct wpa_group *group;
2971
2972 if (sm == NULL || sm->wpa_auth == NULL)
2973 return 0;
2974
2975 group = sm->wpa_auth->group;
2976 while (group) {
2977 if (group->vlan_id == vlan_id)
2978 break;
2979 group = group->next;
2980 }
2981
2982 if (group == NULL) {
2983 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
2984 if (group == NULL)
2985 return -1;
2986 }
2987
2988 if (sm->group == group)
2989 return 0;
2990
2991 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
2992 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
2993
2994 sm->group = group;
2995 return 0;
2996 }
2997
2998
2999 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3000 struct wpa_state_machine *sm, int ack)
3001 {
3002 if (wpa_auth == NULL || sm == NULL)
3003 return;
3004 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3005 " ack=%d", MAC2STR(sm->addr), ack);
3006 if (sm->pending_1_of_4_timeout && ack) {
3007 /*
3008 * Some deployed supplicant implementations update their SNonce
3009 * for each EAPOL-Key 2/4 message even within the same 4-way
3010 * handshake and then fail to use the first SNonce when
3011 * deriving the PTK. This results in unsuccessful 4-way
3012 * handshake whenever the relatively short initial timeout is
3013 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3014 * around this by increasing the timeout now that we know that
3015 * the station has received the frame.
3016 */
3017 int timeout_ms = eapol_key_timeout_subseq;
3018 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3019 "timeout by %u ms because of acknowledged frame",
3020 timeout_ms);
3021 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3022 eloop_register_timeout(timeout_ms / 1000,
3023 (timeout_ms % 1000) * 1000,
3024 wpa_send_eapol_timeout, wpa_auth, sm);
3025 }
3026 }
3027
3028
3029 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3030 {
3031 if (sm == NULL)
3032 return 0;
3033 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3034 }
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