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[thirdparty/hostap.git] / src / ap / wpa_auth.c
1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/state_machine.h"
14 #include "utils/bitfield.h"
15 #include "common/ieee802_11_defs.h"
16 #include "crypto/aes_wrap.h"
17 #include "crypto/crypto.h"
18 #include "crypto/sha1.h"
19 #include "crypto/sha256.h"
20 #include "crypto/random.h"
21 #include "eapol_auth/eapol_auth_sm.h"
22 #include "ap_config.h"
23 #include "ieee802_11.h"
24 #include "wpa_auth.h"
25 #include "pmksa_cache_auth.h"
26 #include "wpa_auth_i.h"
27 #include "wpa_auth_ie.h"
28
29 #define STATE_MACHINE_DATA struct wpa_state_machine
30 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
31 #define STATE_MACHINE_ADDR sm->addr
32
33
34 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
35 static int wpa_sm_step(struct wpa_state_machine *sm);
36 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
37 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
38 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
39 struct wpa_group *group);
40 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
41 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
42 struct wpa_group *group);
43 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
44 struct wpa_group *group);
45
46 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
47 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
48 static const u32 eapol_key_timeout_first = 100; /* ms */
49 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
50 static const u32 eapol_key_timeout_first_group = 500; /* ms */
51
52 /* TODO: make these configurable */
53 static const int dot11RSNAConfigPMKLifetime = 43200;
54 static const int dot11RSNAConfigPMKReauthThreshold = 70;
55 static const int dot11RSNAConfigSATimeout = 60;
56
57
58 static inline int wpa_auth_mic_failure_report(
59 struct wpa_authenticator *wpa_auth, const u8 *addr)
60 {
61 if (wpa_auth->cb.mic_failure_report)
62 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
63 return 0;
64 }
65
66
67 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
68 const u8 *addr, wpa_eapol_variable var,
69 int value)
70 {
71 if (wpa_auth->cb.set_eapol)
72 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
73 }
74
75
76 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
77 const u8 *addr, wpa_eapol_variable var)
78 {
79 if (wpa_auth->cb.get_eapol == NULL)
80 return -1;
81 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
82 }
83
84
85 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
86 const u8 *addr,
87 const u8 *p2p_dev_addr,
88 const u8 *prev_psk)
89 {
90 if (wpa_auth->cb.get_psk == NULL)
91 return NULL;
92 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
93 prev_psk);
94 }
95
96
97 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
98 const u8 *addr, u8 *msk, size_t *len)
99 {
100 if (wpa_auth->cb.get_msk == NULL)
101 return -1;
102 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
103 }
104
105
106 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
107 int vlan_id,
108 enum wpa_alg alg, const u8 *addr, int idx,
109 u8 *key, size_t key_len)
110 {
111 if (wpa_auth->cb.set_key == NULL)
112 return -1;
113 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
114 key, key_len);
115 }
116
117
118 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
119 const u8 *addr, int idx, u8 *seq)
120 {
121 if (wpa_auth->cb.get_seqnum == NULL)
122 return -1;
123 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
124 }
125
126
127 static inline int
128 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
129 const u8 *data, size_t data_len, int encrypt)
130 {
131 if (wpa_auth->cb.send_eapol == NULL)
132 return -1;
133 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
134 encrypt);
135 }
136
137
138 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
139 int (*cb)(struct wpa_state_machine *sm, void *ctx),
140 void *cb_ctx)
141 {
142 if (wpa_auth->cb.for_each_sta == NULL)
143 return 0;
144 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
145 }
146
147
148 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
149 int (*cb)(struct wpa_authenticator *a, void *ctx),
150 void *cb_ctx)
151 {
152 if (wpa_auth->cb.for_each_auth == NULL)
153 return 0;
154 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
155 }
156
157
158 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
159 logger_level level, const char *txt)
160 {
161 if (wpa_auth->cb.logger == NULL)
162 return;
163 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
164 }
165
166
167 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
168 logger_level level, const char *fmt, ...)
169 {
170 char *format;
171 int maxlen;
172 va_list ap;
173
174 if (wpa_auth->cb.logger == NULL)
175 return;
176
177 maxlen = os_strlen(fmt) + 100;
178 format = os_malloc(maxlen);
179 if (!format)
180 return;
181
182 va_start(ap, fmt);
183 vsnprintf(format, maxlen, fmt, ap);
184 va_end(ap);
185
186 wpa_auth_logger(wpa_auth, addr, level, format);
187
188 os_free(format);
189 }
190
191
192 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
193 const u8 *addr)
194 {
195 if (wpa_auth->cb.disconnect == NULL)
196 return;
197 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
198 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
199 WLAN_REASON_PREV_AUTH_NOT_VALID);
200 }
201
202
203 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
204 {
205 int ret = 0;
206 #ifdef CONFIG_IEEE80211R
207 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
208 ret = 1;
209 #endif /* CONFIG_IEEE80211R */
210 #ifdef CONFIG_IEEE80211W
211 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
212 ret = 1;
213 #endif /* CONFIG_IEEE80211W */
214 return ret;
215 }
216
217
218 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
219 {
220 struct wpa_authenticator *wpa_auth = eloop_ctx;
221
222 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
223 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
224 "initialization.");
225 } else {
226 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
227 wpa_hexdump_key(MSG_DEBUG, "GMK",
228 wpa_auth->group->GMK, WPA_GMK_LEN);
229 }
230
231 if (wpa_auth->conf.wpa_gmk_rekey) {
232 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
233 wpa_rekey_gmk, wpa_auth, NULL);
234 }
235 }
236
237
238 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
239 {
240 struct wpa_authenticator *wpa_auth = eloop_ctx;
241 struct wpa_group *group;
242
243 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
244 for (group = wpa_auth->group; group; group = group->next) {
245 group->GTKReKey = TRUE;
246 do {
247 group->changed = FALSE;
248 wpa_group_sm_step(wpa_auth, group);
249 } while (group->changed);
250 }
251
252 if (wpa_auth->conf.wpa_group_rekey) {
253 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
254 0, wpa_rekey_gtk, wpa_auth, NULL);
255 }
256 }
257
258
259 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
260 {
261 struct wpa_authenticator *wpa_auth = eloop_ctx;
262 struct wpa_state_machine *sm = timeout_ctx;
263
264 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
265 wpa_request_new_ptk(sm);
266 wpa_sm_step(sm);
267 }
268
269
270 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
271 {
272 if (sm->pmksa == ctx)
273 sm->pmksa = NULL;
274 return 0;
275 }
276
277
278 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
279 void *ctx)
280 {
281 struct wpa_authenticator *wpa_auth = ctx;
282 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
283 }
284
285
286 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
287 struct wpa_group *group)
288 {
289 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
290 u8 rkey[32];
291 unsigned long ptr;
292
293 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
294 return -1;
295 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
296
297 /*
298 * Counter = PRF-256(Random number, "Init Counter",
299 * Local MAC Address || Time)
300 */
301 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
302 wpa_get_ntp_timestamp(buf + ETH_ALEN);
303 ptr = (unsigned long) group;
304 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
305 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
306 return -1;
307
308 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
309 group->Counter, WPA_NONCE_LEN) < 0)
310 return -1;
311 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
312 group->Counter, WPA_NONCE_LEN);
313
314 return 0;
315 }
316
317
318 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
319 int vlan_id, int delay_init)
320 {
321 struct wpa_group *group;
322
323 group = os_zalloc(sizeof(struct wpa_group));
324 if (group == NULL)
325 return NULL;
326
327 group->GTKAuthenticator = TRUE;
328 group->vlan_id = vlan_id;
329 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
330
331 if (random_pool_ready() != 1) {
332 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
333 "for secure operations - update keys later when "
334 "the first station connects");
335 }
336
337 /*
338 * Set initial GMK/Counter value here. The actual values that will be
339 * used in negotiations will be set once the first station tries to
340 * connect. This allows more time for collecting additional randomness
341 * on embedded devices.
342 */
343 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
344 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
345 "initialization.");
346 os_free(group);
347 return NULL;
348 }
349
350 group->GInit = TRUE;
351 if (delay_init) {
352 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
353 "until Beacon frames have been configured");
354 /* Initialization is completed in wpa_init_keys(). */
355 } else {
356 wpa_group_sm_step(wpa_auth, group);
357 group->GInit = FALSE;
358 wpa_group_sm_step(wpa_auth, group);
359 }
360
361 return group;
362 }
363
364
365 /**
366 * wpa_init - Initialize WPA authenticator
367 * @addr: Authenticator address
368 * @conf: Configuration for WPA authenticator
369 * @cb: Callback functions for WPA authenticator
370 * Returns: Pointer to WPA authenticator data or %NULL on failure
371 */
372 struct wpa_authenticator * wpa_init(const u8 *addr,
373 struct wpa_auth_config *conf,
374 struct wpa_auth_callbacks *cb)
375 {
376 struct wpa_authenticator *wpa_auth;
377
378 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
379 if (wpa_auth == NULL)
380 return NULL;
381 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
382 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
383 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
384
385 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
386 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
387 os_free(wpa_auth);
388 return NULL;
389 }
390
391 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
392 if (wpa_auth->group == NULL) {
393 os_free(wpa_auth->wpa_ie);
394 os_free(wpa_auth);
395 return NULL;
396 }
397
398 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
399 wpa_auth);
400 if (wpa_auth->pmksa == NULL) {
401 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
402 os_free(wpa_auth->wpa_ie);
403 os_free(wpa_auth);
404 return NULL;
405 }
406
407 #ifdef CONFIG_IEEE80211R
408 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
409 if (wpa_auth->ft_pmk_cache == NULL) {
410 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
411 os_free(wpa_auth->wpa_ie);
412 pmksa_cache_auth_deinit(wpa_auth->pmksa);
413 os_free(wpa_auth);
414 return NULL;
415 }
416 #endif /* CONFIG_IEEE80211R */
417
418 if (wpa_auth->conf.wpa_gmk_rekey) {
419 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
420 wpa_rekey_gmk, wpa_auth, NULL);
421 }
422
423 if (wpa_auth->conf.wpa_group_rekey) {
424 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
425 wpa_rekey_gtk, wpa_auth, NULL);
426 }
427
428 #ifdef CONFIG_P2P
429 if (WPA_GET_BE32(conf->ip_addr_start)) {
430 int count = WPA_GET_BE32(conf->ip_addr_end) -
431 WPA_GET_BE32(conf->ip_addr_start) + 1;
432 if (count > 1000)
433 count = 1000;
434 if (count > 0)
435 wpa_auth->ip_pool = bitfield_alloc(count);
436 }
437 #endif /* CONFIG_P2P */
438
439 return wpa_auth;
440 }
441
442
443 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
444 {
445 struct wpa_group *group = wpa_auth->group;
446
447 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
448 "keys");
449 wpa_group_sm_step(wpa_auth, group);
450 group->GInit = FALSE;
451 wpa_group_sm_step(wpa_auth, group);
452 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
453 return -1;
454 return 0;
455 }
456
457
458 /**
459 * wpa_deinit - Deinitialize WPA authenticator
460 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
461 */
462 void wpa_deinit(struct wpa_authenticator *wpa_auth)
463 {
464 struct wpa_group *group, *prev;
465
466 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
467 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
468
469 #ifdef CONFIG_PEERKEY
470 while (wpa_auth->stsl_negotiations)
471 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
472 #endif /* CONFIG_PEERKEY */
473
474 pmksa_cache_auth_deinit(wpa_auth->pmksa);
475
476 #ifdef CONFIG_IEEE80211R
477 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
478 wpa_auth->ft_pmk_cache = NULL;
479 #endif /* CONFIG_IEEE80211R */
480
481 #ifdef CONFIG_P2P
482 bitfield_free(wpa_auth->ip_pool);
483 #endif /* CONFIG_P2P */
484
485
486 os_free(wpa_auth->wpa_ie);
487
488 group = wpa_auth->group;
489 while (group) {
490 prev = group;
491 group = group->next;
492 os_free(prev);
493 }
494
495 os_free(wpa_auth);
496 }
497
498
499 /**
500 * wpa_reconfig - Update WPA authenticator configuration
501 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
502 * @conf: Configuration for WPA authenticator
503 */
504 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
505 struct wpa_auth_config *conf)
506 {
507 struct wpa_group *group;
508 if (wpa_auth == NULL)
509 return 0;
510
511 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
512 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
513 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
514 return -1;
515 }
516
517 /*
518 * Reinitialize GTK to make sure it is suitable for the new
519 * configuration.
520 */
521 group = wpa_auth->group;
522 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
523 group->GInit = TRUE;
524 wpa_group_sm_step(wpa_auth, group);
525 group->GInit = FALSE;
526 wpa_group_sm_step(wpa_auth, group);
527
528 return 0;
529 }
530
531
532 struct wpa_state_machine *
533 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
534 const u8 *p2p_dev_addr)
535 {
536 struct wpa_state_machine *sm;
537
538 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
539 return NULL;
540
541 sm = os_zalloc(sizeof(struct wpa_state_machine));
542 if (sm == NULL)
543 return NULL;
544 os_memcpy(sm->addr, addr, ETH_ALEN);
545 if (p2p_dev_addr)
546 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
547
548 sm->wpa_auth = wpa_auth;
549 sm->group = wpa_auth->group;
550
551 return sm;
552 }
553
554
555 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
556 struct wpa_state_machine *sm)
557 {
558 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
559 return -1;
560
561 #ifdef CONFIG_IEEE80211R
562 if (sm->ft_completed) {
563 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
564 "FT authentication already completed - do not "
565 "start 4-way handshake");
566 return 0;
567 }
568 #endif /* CONFIG_IEEE80211R */
569
570 if (sm->started) {
571 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
572 sm->ReAuthenticationRequest = TRUE;
573 return wpa_sm_step(sm);
574 }
575
576 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
577 "start authentication");
578 sm->started = 1;
579
580 sm->Init = TRUE;
581 if (wpa_sm_step(sm) == 1)
582 return 1; /* should not really happen */
583 sm->Init = FALSE;
584 sm->AuthenticationRequest = TRUE;
585 return wpa_sm_step(sm);
586 }
587
588
589 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
590 {
591 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
592 * reassociates back to the same AP while the previous entry for the
593 * STA has not yet been removed. */
594 if (sm == NULL)
595 return;
596
597 sm->wpa_key_mgmt = 0;
598 }
599
600
601 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
602 {
603 #ifdef CONFIG_P2P
604 if (WPA_GET_BE32(sm->ip_addr)) {
605 u32 start;
606 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
607 "address %u.%u.%u.%u from " MACSTR,
608 sm->ip_addr[0], sm->ip_addr[1],
609 sm->ip_addr[2], sm->ip_addr[3],
610 MAC2STR(sm->addr));
611 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
612 bitfield_clear(sm->wpa_auth->ip_pool,
613 WPA_GET_BE32(sm->ip_addr) - start);
614 }
615 #endif /* CONFIG_P2P */
616 if (sm->GUpdateStationKeys) {
617 sm->group->GKeyDoneStations--;
618 sm->GUpdateStationKeys = FALSE;
619 }
620 #ifdef CONFIG_IEEE80211R
621 os_free(sm->assoc_resp_ftie);
622 #endif /* CONFIG_IEEE80211R */
623 os_free(sm->last_rx_eapol_key);
624 os_free(sm->wpa_ie);
625 os_free(sm);
626 }
627
628
629 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
630 {
631 if (sm == NULL)
632 return;
633
634 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
635 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
636 "strict rekeying - force GTK rekey since STA "
637 "is leaving");
638 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
639 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
640 NULL);
641 }
642
643 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
644 sm->pending_1_of_4_timeout = 0;
645 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
646 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
647 if (sm->in_step_loop) {
648 /* Must not free state machine while wpa_sm_step() is running.
649 * Freeing will be completed in the end of wpa_sm_step(). */
650 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
651 "machine deinit for " MACSTR, MAC2STR(sm->addr));
652 sm->pending_deinit = 1;
653 } else
654 wpa_free_sta_sm(sm);
655 }
656
657
658 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
659 {
660 if (sm == NULL)
661 return;
662
663 sm->PTKRequest = TRUE;
664 sm->PTK_valid = 0;
665 }
666
667
668 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
669 const u8 *replay_counter)
670 {
671 int i;
672 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
673 if (!ctr[i].valid)
674 break;
675 if (os_memcmp(replay_counter, ctr[i].counter,
676 WPA_REPLAY_COUNTER_LEN) == 0)
677 return 1;
678 }
679 return 0;
680 }
681
682
683 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
684 const u8 *replay_counter)
685 {
686 int i;
687 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
688 if (ctr[i].valid &&
689 (replay_counter == NULL ||
690 os_memcmp(replay_counter, ctr[i].counter,
691 WPA_REPLAY_COUNTER_LEN) == 0))
692 ctr[i].valid = FALSE;
693 }
694 }
695
696
697 #ifdef CONFIG_IEEE80211R
698 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
699 struct wpa_state_machine *sm,
700 struct wpa_eapol_ie_parse *kde)
701 {
702 struct wpa_ie_data ie;
703 struct rsn_mdie *mdie;
704
705 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
706 ie.num_pmkid != 1 || ie.pmkid == NULL) {
707 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
708 "FT 4-way handshake message 2/4");
709 return -1;
710 }
711
712 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
713 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
714 sm->sup_pmk_r1_name, PMKID_LEN);
715
716 if (!kde->mdie || !kde->ftie) {
717 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
718 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
719 return -1;
720 }
721
722 mdie = (struct rsn_mdie *) (kde->mdie + 2);
723 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
724 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
725 MOBILITY_DOMAIN_ID_LEN) != 0) {
726 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
727 return -1;
728 }
729
730 if (sm->assoc_resp_ftie &&
731 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
732 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
733 2 + sm->assoc_resp_ftie[1]) != 0)) {
734 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
735 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
736 kde->ftie, kde->ftie_len);
737 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
738 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
739 return -1;
740 }
741
742 return 0;
743 }
744 #endif /* CONFIG_IEEE80211R */
745
746
747 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
748 struct wpa_state_machine *sm, int group)
749 {
750 /* Supplicant reported a Michael MIC error */
751 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
752 "received EAPOL-Key Error Request "
753 "(STA detected Michael MIC failure (group=%d))",
754 group);
755
756 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
757 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
758 "ignore Michael MIC failure report since "
759 "group cipher is not TKIP");
760 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
761 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
762 "ignore Michael MIC failure report since "
763 "pairwise cipher is not TKIP");
764 } else {
765 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
766 return 1; /* STA entry was removed */
767 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
768 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
769 }
770
771 /*
772 * Error report is not a request for a new key handshake, but since
773 * Authenticator may do it, let's change the keys now anyway.
774 */
775 wpa_request_new_ptk(sm);
776 return 0;
777 }
778
779
780 void wpa_receive(struct wpa_authenticator *wpa_auth,
781 struct wpa_state_machine *sm,
782 u8 *data, size_t data_len)
783 {
784 struct ieee802_1x_hdr *hdr;
785 struct wpa_eapol_key *key;
786 u16 key_info, key_data_length;
787 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
788 SMK_M1, SMK_M3, SMK_ERROR } msg;
789 char *msgtxt;
790 struct wpa_eapol_ie_parse kde;
791 int ft;
792 const u8 *eapol_key_ie;
793 size_t eapol_key_ie_len;
794
795 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
796 return;
797
798 if (data_len < sizeof(*hdr) + sizeof(*key))
799 return;
800
801 hdr = (struct ieee802_1x_hdr *) data;
802 key = (struct wpa_eapol_key *) (hdr + 1);
803 key_info = WPA_GET_BE16(key->key_info);
804 key_data_length = WPA_GET_BE16(key->key_data_length);
805 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
806 " key_info=0x%x type=%u key_data_length=%u",
807 MAC2STR(sm->addr), key_info, key->type, key_data_length);
808 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
809 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
810 "key_data overflow (%d > %lu)",
811 key_data_length,
812 (unsigned long) (data_len - sizeof(*hdr) -
813 sizeof(*key)));
814 return;
815 }
816
817 if (sm->wpa == WPA_VERSION_WPA2) {
818 if (key->type == EAPOL_KEY_TYPE_WPA) {
819 /*
820 * Some deployed station implementations seem to send
821 * msg 4/4 with incorrect type value in WPA2 mode.
822 */
823 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
824 "with unexpected WPA type in RSN mode");
825 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
826 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
827 "unexpected type %d in RSN mode",
828 key->type);
829 return;
830 }
831 } else {
832 if (key->type != EAPOL_KEY_TYPE_WPA) {
833 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
834 "unexpected type %d in WPA mode",
835 key->type);
836 return;
837 }
838 }
839
840 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
841 WPA_NONCE_LEN);
842 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
843 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
844
845 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
846 * are set */
847
848 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
849 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
850 if (key_info & WPA_KEY_INFO_ERROR) {
851 msg = SMK_ERROR;
852 msgtxt = "SMK Error";
853 } else {
854 msg = SMK_M1;
855 msgtxt = "SMK M1";
856 }
857 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
858 msg = SMK_M3;
859 msgtxt = "SMK M3";
860 } else if (key_info & WPA_KEY_INFO_REQUEST) {
861 msg = REQUEST;
862 msgtxt = "Request";
863 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
864 msg = GROUP_2;
865 msgtxt = "2/2 Group";
866 } else if (key_data_length == 0) {
867 msg = PAIRWISE_4;
868 msgtxt = "4/4 Pairwise";
869 } else {
870 msg = PAIRWISE_2;
871 msgtxt = "2/4 Pairwise";
872 }
873
874 /* TODO: key_info type validation for PeerKey */
875 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
876 msg == GROUP_2) {
877 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
878 if (sm->pairwise == WPA_CIPHER_CCMP ||
879 sm->pairwise == WPA_CIPHER_GCMP) {
880 if (wpa_use_aes_cmac(sm) &&
881 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
882 wpa_auth_logger(wpa_auth, sm->addr,
883 LOGGER_WARNING,
884 "advertised support for "
885 "AES-128-CMAC, but did not "
886 "use it");
887 return;
888 }
889
890 if (!wpa_use_aes_cmac(sm) &&
891 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
892 wpa_auth_logger(wpa_auth, sm->addr,
893 LOGGER_WARNING,
894 "did not use HMAC-SHA1-AES "
895 "with CCMP/GCMP");
896 return;
897 }
898 }
899 }
900
901 if (key_info & WPA_KEY_INFO_REQUEST) {
902 if (sm->req_replay_counter_used &&
903 os_memcmp(key->replay_counter, sm->req_replay_counter,
904 WPA_REPLAY_COUNTER_LEN) <= 0) {
905 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
906 "received EAPOL-Key request with "
907 "replayed counter");
908 return;
909 }
910 }
911
912 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
913 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
914 int i;
915
916 if (msg == PAIRWISE_2 &&
917 wpa_replay_counter_valid(sm->prev_key_replay,
918 key->replay_counter) &&
919 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
920 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
921 {
922 /*
923 * Some supplicant implementations (e.g., Windows XP
924 * WZC) update SNonce for each EAPOL-Key 2/4. This
925 * breaks the workaround on accepting any of the
926 * pending requests, so allow the SNonce to be updated
927 * even if we have already sent out EAPOL-Key 3/4.
928 */
929 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
930 "Process SNonce update from STA "
931 "based on retransmitted EAPOL-Key "
932 "1/4");
933 sm->update_snonce = 1;
934 wpa_replay_counter_mark_invalid(sm->prev_key_replay,
935 key->replay_counter);
936 goto continue_processing;
937 }
938
939 if (msg == PAIRWISE_2 &&
940 wpa_replay_counter_valid(sm->prev_key_replay,
941 key->replay_counter) &&
942 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
943 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
944 "ignore retransmitted EAPOL-Key %s - "
945 "SNonce did not change", msgtxt);
946 } else {
947 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
948 "received EAPOL-Key %s with "
949 "unexpected replay counter", msgtxt);
950 }
951 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
952 if (!sm->key_replay[i].valid)
953 break;
954 wpa_hexdump(MSG_DEBUG, "pending replay counter",
955 sm->key_replay[i].counter,
956 WPA_REPLAY_COUNTER_LEN);
957 }
958 wpa_hexdump(MSG_DEBUG, "received replay counter",
959 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
960 return;
961 }
962
963 continue_processing:
964 switch (msg) {
965 case PAIRWISE_2:
966 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
967 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
968 (!sm->update_snonce ||
969 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
970 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
971 "received EAPOL-Key msg 2/4 in "
972 "invalid state (%d) - dropped",
973 sm->wpa_ptk_state);
974 return;
975 }
976 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
977 if (sm->group->reject_4way_hs_for_entropy) {
978 /*
979 * The system did not have enough entropy to generate
980 * strong random numbers. Reject the first 4-way
981 * handshake(s) and collect some entropy based on the
982 * information from it. Once enough entropy is
983 * available, the next atempt will trigger GMK/Key
984 * Counter update and the station will be allowed to
985 * continue.
986 */
987 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
988 "collect more entropy for random number "
989 "generation");
990 random_mark_pool_ready();
991 wpa_sta_disconnect(wpa_auth, sm->addr);
992 return;
993 }
994 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
995 &kde) < 0) {
996 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
997 "received EAPOL-Key msg 2/4 with "
998 "invalid Key Data contents");
999 return;
1000 }
1001 if (kde.rsn_ie) {
1002 eapol_key_ie = kde.rsn_ie;
1003 eapol_key_ie_len = kde.rsn_ie_len;
1004 } else {
1005 eapol_key_ie = kde.wpa_ie;
1006 eapol_key_ie_len = kde.wpa_ie_len;
1007 }
1008 ft = sm->wpa == WPA_VERSION_WPA2 &&
1009 wpa_key_mgmt_ft(sm->wpa_key_mgmt);
1010 if (sm->wpa_ie == NULL ||
1011 wpa_compare_rsn_ie(ft,
1012 sm->wpa_ie, sm->wpa_ie_len,
1013 eapol_key_ie, eapol_key_ie_len)) {
1014 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1015 "WPA IE from (Re)AssocReq did not "
1016 "match with msg 2/4");
1017 if (sm->wpa_ie) {
1018 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
1019 sm->wpa_ie, sm->wpa_ie_len);
1020 }
1021 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
1022 eapol_key_ie, eapol_key_ie_len);
1023 /* MLME-DEAUTHENTICATE.request */
1024 wpa_sta_disconnect(wpa_auth, sm->addr);
1025 return;
1026 }
1027 #ifdef CONFIG_IEEE80211R
1028 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
1029 wpa_sta_disconnect(wpa_auth, sm->addr);
1030 return;
1031 }
1032 #endif /* CONFIG_IEEE80211R */
1033 #ifdef CONFIG_P2P
1034 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
1035 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
1036 int idx;
1037 wpa_printf(MSG_DEBUG, "P2P: IP address requested in "
1038 "EAPOL-Key exchange");
1039 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
1040 if (idx >= 0) {
1041 u32 start = WPA_GET_BE32(wpa_auth->conf.
1042 ip_addr_start);
1043 bitfield_set(wpa_auth->ip_pool, idx);
1044 WPA_PUT_BE32(sm->ip_addr, start + idx);
1045 wpa_printf(MSG_DEBUG, "P2P: Assigned IP "
1046 "address %u.%u.%u.%u to " MACSTR,
1047 sm->ip_addr[0], sm->ip_addr[1],
1048 sm->ip_addr[2], sm->ip_addr[3],
1049 MAC2STR(sm->addr));
1050 }
1051 }
1052 #endif /* CONFIG_P2P */
1053 break;
1054 case PAIRWISE_4:
1055 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1056 !sm->PTK_valid) {
1057 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1058 "received EAPOL-Key msg 4/4 in "
1059 "invalid state (%d) - dropped",
1060 sm->wpa_ptk_state);
1061 return;
1062 }
1063 break;
1064 case GROUP_2:
1065 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1066 || !sm->PTK_valid) {
1067 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1068 "received EAPOL-Key msg 2/2 in "
1069 "invalid state (%d) - dropped",
1070 sm->wpa_ptk_group_state);
1071 return;
1072 }
1073 break;
1074 #ifdef CONFIG_PEERKEY
1075 case SMK_M1:
1076 case SMK_M3:
1077 case SMK_ERROR:
1078 if (!wpa_auth->conf.peerkey) {
1079 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1080 "PeerKey use disabled - ignoring message");
1081 return;
1082 }
1083 if (!sm->PTK_valid) {
1084 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1085 "received EAPOL-Key msg SMK in "
1086 "invalid state - dropped");
1087 return;
1088 }
1089 break;
1090 #else /* CONFIG_PEERKEY */
1091 case SMK_M1:
1092 case SMK_M3:
1093 case SMK_ERROR:
1094 return; /* STSL disabled - ignore SMK messages */
1095 #endif /* CONFIG_PEERKEY */
1096 case REQUEST:
1097 break;
1098 }
1099
1100 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1101 "received EAPOL-Key frame (%s)", msgtxt);
1102
1103 if (key_info & WPA_KEY_INFO_ACK) {
1104 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1105 "received invalid EAPOL-Key: Key Ack set");
1106 return;
1107 }
1108
1109 if (!(key_info & WPA_KEY_INFO_MIC)) {
1110 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1111 "received invalid EAPOL-Key: Key MIC not set");
1112 return;
1113 }
1114
1115 sm->MICVerified = FALSE;
1116 if (sm->PTK_valid && !sm->update_snonce) {
1117 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1118 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1119 "received EAPOL-Key with invalid MIC");
1120 return;
1121 }
1122 sm->MICVerified = TRUE;
1123 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1124 sm->pending_1_of_4_timeout = 0;
1125 }
1126
1127 if (key_info & WPA_KEY_INFO_REQUEST) {
1128 if (sm->MICVerified) {
1129 sm->req_replay_counter_used = 1;
1130 os_memcpy(sm->req_replay_counter, key->replay_counter,
1131 WPA_REPLAY_COUNTER_LEN);
1132 } else {
1133 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1134 "received EAPOL-Key request with "
1135 "invalid MIC");
1136 return;
1137 }
1138
1139 /*
1140 * TODO: should decrypt key data field if encryption was used;
1141 * even though MAC address KDE is not normally encrypted,
1142 * supplicant is allowed to encrypt it.
1143 */
1144 if (msg == SMK_ERROR) {
1145 #ifdef CONFIG_PEERKEY
1146 wpa_smk_error(wpa_auth, sm, key);
1147 #endif /* CONFIG_PEERKEY */
1148 return;
1149 } else if (key_info & WPA_KEY_INFO_ERROR) {
1150 if (wpa_receive_error_report(
1151 wpa_auth, sm,
1152 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1153 return; /* STA entry was removed */
1154 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1155 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1156 "received EAPOL-Key Request for new "
1157 "4-Way Handshake");
1158 wpa_request_new_ptk(sm);
1159 #ifdef CONFIG_PEERKEY
1160 } else if (msg == SMK_M1) {
1161 wpa_smk_m1(wpa_auth, sm, key);
1162 #endif /* CONFIG_PEERKEY */
1163 } else if (key_data_length > 0 &&
1164 wpa_parse_kde_ies((const u8 *) (key + 1),
1165 key_data_length, &kde) == 0 &&
1166 kde.mac_addr) {
1167 } else {
1168 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1169 "received EAPOL-Key Request for GTK "
1170 "rekeying");
1171 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1172 wpa_rekey_gtk(wpa_auth, NULL);
1173 }
1174 } else {
1175 /* Do not allow the same key replay counter to be reused. */
1176 wpa_replay_counter_mark_invalid(sm->key_replay,
1177 key->replay_counter);
1178
1179 if (msg == PAIRWISE_2) {
1180 /*
1181 * Maintain a copy of the pending EAPOL-Key frames in
1182 * case the EAPOL-Key frame was retransmitted. This is
1183 * needed to allow EAPOL-Key msg 2/4 reply to another
1184 * pending msg 1/4 to update the SNonce to work around
1185 * unexpected supplicant behavior.
1186 */
1187 os_memcpy(sm->prev_key_replay, sm->key_replay,
1188 sizeof(sm->key_replay));
1189 } else {
1190 os_memset(sm->prev_key_replay, 0,
1191 sizeof(sm->prev_key_replay));
1192 }
1193
1194 /*
1195 * Make sure old valid counters are not accepted anymore and
1196 * do not get copied again.
1197 */
1198 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1199 }
1200
1201 #ifdef CONFIG_PEERKEY
1202 if (msg == SMK_M3) {
1203 wpa_smk_m3(wpa_auth, sm, key);
1204 return;
1205 }
1206 #endif /* CONFIG_PEERKEY */
1207
1208 os_free(sm->last_rx_eapol_key);
1209 sm->last_rx_eapol_key = os_malloc(data_len);
1210 if (sm->last_rx_eapol_key == NULL)
1211 return;
1212 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1213 sm->last_rx_eapol_key_len = data_len;
1214
1215 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1216 sm->EAPOLKeyReceived = TRUE;
1217 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1218 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1219 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1220 wpa_sm_step(sm);
1221 }
1222
1223
1224 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1225 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1226 {
1227 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1228 u8 *pos;
1229 int ret = 0;
1230
1231 /* GTK = PRF-X(GMK, "Group key expansion",
1232 * AA || GNonce || Time || random data)
1233 * The example described in the IEEE 802.11 standard uses only AA and
1234 * GNonce as inputs here. Add some more entropy since this derivation
1235 * is done only at the Authenticator and as such, does not need to be
1236 * exactly same.
1237 */
1238 os_memcpy(data, addr, ETH_ALEN);
1239 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1240 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1241 wpa_get_ntp_timestamp(pos);
1242 pos += 8;
1243 if (random_get_bytes(pos, 16) < 0)
1244 ret = -1;
1245
1246 #ifdef CONFIG_IEEE80211W
1247 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1248 #else /* CONFIG_IEEE80211W */
1249 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1250 < 0)
1251 ret = -1;
1252 #endif /* CONFIG_IEEE80211W */
1253
1254 return ret;
1255 }
1256
1257
1258 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1259 {
1260 struct wpa_authenticator *wpa_auth = eloop_ctx;
1261 struct wpa_state_machine *sm = timeout_ctx;
1262
1263 sm->pending_1_of_4_timeout = 0;
1264 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1265 sm->TimeoutEvt = TRUE;
1266 wpa_sm_step(sm);
1267 }
1268
1269
1270 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1271 struct wpa_state_machine *sm, int key_info,
1272 const u8 *key_rsc, const u8 *nonce,
1273 const u8 *kde, size_t kde_len,
1274 int keyidx, int encr, int force_version)
1275 {
1276 struct ieee802_1x_hdr *hdr;
1277 struct wpa_eapol_key *key;
1278 size_t len;
1279 int alg;
1280 int key_data_len, pad_len = 0;
1281 u8 *buf, *pos;
1282 int version, pairwise;
1283 int i;
1284
1285 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1286
1287 if (force_version)
1288 version = force_version;
1289 else if (wpa_use_aes_cmac(sm))
1290 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1291 else if (sm->pairwise != WPA_CIPHER_TKIP)
1292 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1293 else
1294 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1295
1296 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1297
1298 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1299 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1300 "encr=%d)",
1301 version,
1302 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1303 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1304 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1305 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1306 pairwise, (unsigned long) kde_len, keyidx, encr);
1307
1308 key_data_len = kde_len;
1309
1310 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1311 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1312 pad_len = key_data_len % 8;
1313 if (pad_len)
1314 pad_len = 8 - pad_len;
1315 key_data_len += pad_len + 8;
1316 }
1317
1318 len += key_data_len;
1319
1320 hdr = os_zalloc(len);
1321 if (hdr == NULL)
1322 return;
1323 hdr->version = wpa_auth->conf.eapol_version;
1324 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1325 hdr->length = host_to_be16(len - sizeof(*hdr));
1326 key = (struct wpa_eapol_key *) (hdr + 1);
1327
1328 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1329 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1330 key_info |= version;
1331 if (encr && sm->wpa == WPA_VERSION_WPA2)
1332 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1333 if (sm->wpa != WPA_VERSION_WPA2)
1334 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1335 WPA_PUT_BE16(key->key_info, key_info);
1336
1337 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1338 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1339 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1340 WPA_PUT_BE16(key->key_length, 0);
1341
1342 /* FIX: STSL: what to use as key_replay_counter? */
1343 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1344 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1345 os_memcpy(sm->key_replay[i].counter,
1346 sm->key_replay[i - 1].counter,
1347 WPA_REPLAY_COUNTER_LEN);
1348 }
1349 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1350 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1351 WPA_REPLAY_COUNTER_LEN);
1352 sm->key_replay[0].valid = TRUE;
1353
1354 if (nonce)
1355 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1356
1357 if (key_rsc)
1358 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1359
1360 if (kde && !encr) {
1361 os_memcpy(key + 1, kde, kde_len);
1362 WPA_PUT_BE16(key->key_data_length, kde_len);
1363 } else if (encr && kde) {
1364 buf = os_zalloc(key_data_len);
1365 if (buf == NULL) {
1366 os_free(hdr);
1367 return;
1368 }
1369 pos = buf;
1370 os_memcpy(pos, kde, kde_len);
1371 pos += kde_len;
1372
1373 if (pad_len)
1374 *pos++ = 0xdd;
1375
1376 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1377 buf, key_data_len);
1378 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1379 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1380 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1381 (u8 *) (key + 1))) {
1382 os_free(hdr);
1383 os_free(buf);
1384 return;
1385 }
1386 WPA_PUT_BE16(key->key_data_length, key_data_len);
1387 } else {
1388 u8 ek[32];
1389 os_memcpy(key->key_iv,
1390 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1391 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1392 os_memcpy(ek, key->key_iv, 16);
1393 os_memcpy(ek + 16, sm->PTK.kek, 16);
1394 os_memcpy(key + 1, buf, key_data_len);
1395 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1396 WPA_PUT_BE16(key->key_data_length, key_data_len);
1397 }
1398 os_free(buf);
1399 }
1400
1401 if (key_info & WPA_KEY_INFO_MIC) {
1402 if (!sm->PTK_valid) {
1403 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1404 "PTK not valid when sending EAPOL-Key "
1405 "frame");
1406 os_free(hdr);
1407 return;
1408 }
1409 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1410 key->key_mic);
1411 #ifdef CONFIG_TESTING_OPTIONS
1412 if (!pairwise &&
1413 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0d &&
1414 drand48() <
1415 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1416 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1417 "Corrupting group EAPOL-Key Key MIC");
1418 key->key_mic[0]++;
1419 }
1420 #endif /* CONFIG_TESTING_OPTIONS */
1421 }
1422
1423 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1424 1);
1425 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1426 sm->pairwise_set);
1427 os_free(hdr);
1428 }
1429
1430
1431 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1432 struct wpa_state_machine *sm, int key_info,
1433 const u8 *key_rsc, const u8 *nonce,
1434 const u8 *kde, size_t kde_len,
1435 int keyidx, int encr)
1436 {
1437 int timeout_ms;
1438 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1439 int ctr;
1440
1441 if (sm == NULL)
1442 return;
1443
1444 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1445 keyidx, encr, 0);
1446
1447 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1448 if (ctr == 1 && wpa_auth->conf.tx_status)
1449 timeout_ms = pairwise ? eapol_key_timeout_first :
1450 eapol_key_timeout_first_group;
1451 else
1452 timeout_ms = eapol_key_timeout_subseq;
1453 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1454 sm->pending_1_of_4_timeout = 1;
1455 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1456 "counter %d)", timeout_ms, ctr);
1457 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1458 wpa_send_eapol_timeout, wpa_auth, sm);
1459 }
1460
1461
1462 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1463 {
1464 struct ieee802_1x_hdr *hdr;
1465 struct wpa_eapol_key *key;
1466 u16 key_info;
1467 int ret = 0;
1468 u8 mic[16];
1469
1470 if (data_len < sizeof(*hdr) + sizeof(*key))
1471 return -1;
1472
1473 hdr = (struct ieee802_1x_hdr *) data;
1474 key = (struct wpa_eapol_key *) (hdr + 1);
1475 key_info = WPA_GET_BE16(key->key_info);
1476 os_memcpy(mic, key->key_mic, 16);
1477 os_memset(key->key_mic, 0, 16);
1478 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1479 data, data_len, key->key_mic) ||
1480 os_memcmp(mic, key->key_mic, 16) != 0)
1481 ret = -1;
1482 os_memcpy(key->key_mic, mic, 16);
1483 return ret;
1484 }
1485
1486
1487 void wpa_remove_ptk(struct wpa_state_machine *sm)
1488 {
1489 sm->PTK_valid = FALSE;
1490 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1491 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1492 sm->pairwise_set = FALSE;
1493 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1494 }
1495
1496
1497 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1498 {
1499 int remove_ptk = 1;
1500
1501 if (sm == NULL)
1502 return -1;
1503
1504 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1505 "event %d notification", event);
1506
1507 switch (event) {
1508 case WPA_AUTH:
1509 case WPA_ASSOC:
1510 break;
1511 case WPA_DEAUTH:
1512 case WPA_DISASSOC:
1513 sm->DeauthenticationRequest = TRUE;
1514 break;
1515 case WPA_REAUTH:
1516 case WPA_REAUTH_EAPOL:
1517 if (!sm->started) {
1518 /*
1519 * When using WPS, we may end up here if the STA
1520 * manages to re-associate without the previous STA
1521 * entry getting removed. Consequently, we need to make
1522 * sure that the WPA state machines gets initialized
1523 * properly at this point.
1524 */
1525 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1526 "started - initialize now");
1527 sm->started = 1;
1528 sm->Init = TRUE;
1529 if (wpa_sm_step(sm) == 1)
1530 return 1; /* should not really happen */
1531 sm->Init = FALSE;
1532 sm->AuthenticationRequest = TRUE;
1533 break;
1534 }
1535 if (sm->GUpdateStationKeys) {
1536 /*
1537 * Reauthentication cancels the pending group key
1538 * update for this STA.
1539 */
1540 sm->group->GKeyDoneStations--;
1541 sm->GUpdateStationKeys = FALSE;
1542 sm->PtkGroupInit = TRUE;
1543 }
1544 sm->ReAuthenticationRequest = TRUE;
1545 break;
1546 case WPA_ASSOC_FT:
1547 #ifdef CONFIG_IEEE80211R
1548 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1549 "after association");
1550 wpa_ft_install_ptk(sm);
1551
1552 /* Using FT protocol, not WPA auth state machine */
1553 sm->ft_completed = 1;
1554 return 0;
1555 #else /* CONFIG_IEEE80211R */
1556 break;
1557 #endif /* CONFIG_IEEE80211R */
1558 }
1559
1560 #ifdef CONFIG_IEEE80211R
1561 sm->ft_completed = 0;
1562 #endif /* CONFIG_IEEE80211R */
1563
1564 #ifdef CONFIG_IEEE80211W
1565 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1566 remove_ptk = 0;
1567 #endif /* CONFIG_IEEE80211W */
1568
1569 if (remove_ptk) {
1570 sm->PTK_valid = FALSE;
1571 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1572
1573 if (event != WPA_REAUTH_EAPOL)
1574 wpa_remove_ptk(sm);
1575 }
1576
1577 return wpa_sm_step(sm);
1578 }
1579
1580
1581 SM_STATE(WPA_PTK, INITIALIZE)
1582 {
1583 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1584 if (sm->Init) {
1585 /* Init flag is not cleared here, so avoid busy
1586 * loop by claiming nothing changed. */
1587 sm->changed = FALSE;
1588 }
1589
1590 sm->keycount = 0;
1591 if (sm->GUpdateStationKeys)
1592 sm->group->GKeyDoneStations--;
1593 sm->GUpdateStationKeys = FALSE;
1594 if (sm->wpa == WPA_VERSION_WPA)
1595 sm->PInitAKeys = FALSE;
1596 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1597 * Local AA > Remote AA)) */) {
1598 sm->Pair = TRUE;
1599 }
1600 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1601 wpa_remove_ptk(sm);
1602 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1603 sm->TimeoutCtr = 0;
1604 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1605 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1606 WPA_EAPOL_authorized, 0);
1607 }
1608 }
1609
1610
1611 SM_STATE(WPA_PTK, DISCONNECT)
1612 {
1613 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1614 sm->Disconnect = FALSE;
1615 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1616 }
1617
1618
1619 SM_STATE(WPA_PTK, DISCONNECTED)
1620 {
1621 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1622 sm->DeauthenticationRequest = FALSE;
1623 }
1624
1625
1626 SM_STATE(WPA_PTK, AUTHENTICATION)
1627 {
1628 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1629 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1630 sm->PTK_valid = FALSE;
1631 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1632 1);
1633 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1634 sm->AuthenticationRequest = FALSE;
1635 }
1636
1637
1638 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1639 struct wpa_group *group)
1640 {
1641 if (group->first_sta_seen)
1642 return;
1643 /*
1644 * System has run bit further than at the time hostapd was started
1645 * potentially very early during boot up. This provides better chances
1646 * of collecting more randomness on embedded systems. Re-initialize the
1647 * GMK and Counter here to improve their strength if there was not
1648 * enough entropy available immediately after system startup.
1649 */
1650 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1651 "station");
1652 if (random_pool_ready() != 1) {
1653 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1654 "to proceed - reject first 4-way handshake");
1655 group->reject_4way_hs_for_entropy = TRUE;
1656 } else {
1657 group->first_sta_seen = TRUE;
1658 group->reject_4way_hs_for_entropy = FALSE;
1659 }
1660
1661 wpa_group_init_gmk_and_counter(wpa_auth, group);
1662 wpa_gtk_update(wpa_auth, group);
1663 wpa_group_config_group_keys(wpa_auth, group);
1664 }
1665
1666
1667 SM_STATE(WPA_PTK, AUTHENTICATION2)
1668 {
1669 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1670
1671 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1672 sm->ReAuthenticationRequest = FALSE;
1673
1674 /*
1675 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1676 * ambiguous. The Authenticator state machine uses a counter that is
1677 * incremented by one for each 4-way handshake. However, the security
1678 * analysis of 4-way handshake points out that unpredictable nonces
1679 * help in preventing precomputation attacks. Instead of the state
1680 * machine definition, use an unpredictable nonce value here to provide
1681 * stronger protection against potential precomputation attacks.
1682 */
1683 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1684 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1685 "ANonce.");
1686 sm->Disconnect = TRUE;
1687 return;
1688 }
1689 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1690 WPA_NONCE_LEN);
1691 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1692 * logical place than INITIALIZE since AUTHENTICATION2 can be
1693 * re-entered on ReAuthenticationRequest without going through
1694 * INITIALIZE. */
1695 sm->TimeoutCtr = 0;
1696 }
1697
1698
1699 SM_STATE(WPA_PTK, INITPMK)
1700 {
1701 u8 msk[2 * PMK_LEN];
1702 size_t len = 2 * PMK_LEN;
1703
1704 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1705 #ifdef CONFIG_IEEE80211R
1706 sm->xxkey_len = 0;
1707 #endif /* CONFIG_IEEE80211R */
1708 if (sm->pmksa) {
1709 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1710 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1711 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1712 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1713 "(len=%lu)", (unsigned long) len);
1714 os_memcpy(sm->PMK, msk, PMK_LEN);
1715 #ifdef CONFIG_IEEE80211R
1716 if (len >= 2 * PMK_LEN) {
1717 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1718 sm->xxkey_len = PMK_LEN;
1719 }
1720 #endif /* CONFIG_IEEE80211R */
1721 } else {
1722 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1723 }
1724
1725 sm->req_replay_counter_used = 0;
1726 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1727 * will break reauthentication since EAPOL state machines may not be
1728 * get into AUTHENTICATING state that clears keyRun before WPA state
1729 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1730 * state and takes PMK from the previously used AAA Key. This will
1731 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1732 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1733 * be good workaround for this issue. */
1734 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1735 }
1736
1737
1738 SM_STATE(WPA_PTK, INITPSK)
1739 {
1740 const u8 *psk;
1741 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1742 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1743 if (psk) {
1744 os_memcpy(sm->PMK, psk, PMK_LEN);
1745 #ifdef CONFIG_IEEE80211R
1746 os_memcpy(sm->xxkey, psk, PMK_LEN);
1747 sm->xxkey_len = PMK_LEN;
1748 #endif /* CONFIG_IEEE80211R */
1749 }
1750 sm->req_replay_counter_used = 0;
1751 }
1752
1753
1754 SM_STATE(WPA_PTK, PTKSTART)
1755 {
1756 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1757 size_t pmkid_len = 0;
1758
1759 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1760 sm->PTKRequest = FALSE;
1761 sm->TimeoutEvt = FALSE;
1762
1763 sm->TimeoutCtr++;
1764 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1765 /* No point in sending the EAPOL-Key - we will disconnect
1766 * immediately following this. */
1767 return;
1768 }
1769
1770 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1771 "sending 1/4 msg of 4-Way Handshake");
1772 /*
1773 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1774 * one possible PSK for this STA.
1775 */
1776 if (sm->wpa == WPA_VERSION_WPA2 &&
1777 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1778 pmkid = buf;
1779 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1780 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1781 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1782 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1783 if (sm->pmksa)
1784 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1785 sm->pmksa->pmkid, PMKID_LEN);
1786 else {
1787 /*
1788 * Calculate PMKID since no PMKSA cache entry was
1789 * available with pre-calculated PMKID.
1790 */
1791 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1792 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1793 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1794 }
1795 }
1796 wpa_send_eapol(sm->wpa_auth, sm,
1797 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1798 sm->ANonce, pmkid, pmkid_len, 0, 0);
1799 }
1800
1801
1802 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1803 struct wpa_ptk *ptk)
1804 {
1805 size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64;
1806 #ifdef CONFIG_IEEE80211R
1807 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1808 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1809 #endif /* CONFIG_IEEE80211R */
1810
1811 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1812 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1813 (u8 *) ptk, ptk_len,
1814 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1815
1816 return 0;
1817 }
1818
1819
1820 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1821 {
1822 struct wpa_ptk PTK;
1823 int ok = 0;
1824 const u8 *pmk = NULL;
1825
1826 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1827 sm->EAPOLKeyReceived = FALSE;
1828 sm->update_snonce = FALSE;
1829
1830 /* WPA with IEEE 802.1X: use the derived PMK from EAP
1831 * WPA-PSK: iterate through possible PSKs and select the one matching
1832 * the packet */
1833 for (;;) {
1834 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1835 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
1836 sm->p2p_dev_addr, pmk);
1837 if (pmk == NULL)
1838 break;
1839 } else
1840 pmk = sm->PMK;
1841
1842 wpa_derive_ptk(sm, pmk, &PTK);
1843
1844 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1845 sm->last_rx_eapol_key_len) == 0) {
1846 ok = 1;
1847 break;
1848 }
1849
1850 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1851 break;
1852 }
1853
1854 if (!ok) {
1855 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1856 "invalid MIC in msg 2/4 of 4-Way Handshake");
1857 return;
1858 }
1859
1860 #ifdef CONFIG_IEEE80211R
1861 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1862 /*
1863 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1864 * with the value we derived.
1865 */
1866 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1867 WPA_PMK_NAME_LEN) != 0) {
1868 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1869 "PMKR1Name mismatch in FT 4-way "
1870 "handshake");
1871 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1872 "Supplicant",
1873 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1874 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1875 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1876 return;
1877 }
1878 }
1879 #endif /* CONFIG_IEEE80211R */
1880
1881 sm->pending_1_of_4_timeout = 0;
1882 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1883
1884 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1885 /* PSK may have changed from the previous choice, so update
1886 * state machine data based on whatever PSK was selected here.
1887 */
1888 os_memcpy(sm->PMK, pmk, PMK_LEN);
1889 }
1890
1891 sm->MICVerified = TRUE;
1892
1893 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1894 sm->PTK_valid = TRUE;
1895 }
1896
1897
1898 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1899 {
1900 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1901 sm->TimeoutCtr = 0;
1902 }
1903
1904
1905 #ifdef CONFIG_IEEE80211W
1906
1907 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1908 {
1909 if (sm->mgmt_frame_prot) {
1910 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1911 }
1912
1913 return 0;
1914 }
1915
1916
1917 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1918 {
1919 struct wpa_igtk_kde igtk;
1920 struct wpa_group *gsm = sm->group;
1921 u8 rsc[WPA_KEY_RSC_LEN];
1922
1923 if (!sm->mgmt_frame_prot)
1924 return pos;
1925
1926 igtk.keyid[0] = gsm->GN_igtk;
1927 igtk.keyid[1] = 0;
1928 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1929 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
1930 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1931 else
1932 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
1933 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1934 if (sm->wpa_auth->conf.disable_gtk) {
1935 /*
1936 * Provide unique random IGTK to each STA to prevent use of
1937 * IGTK in the BSS.
1938 */
1939 if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0)
1940 return pos;
1941 }
1942 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1943 (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1944
1945 return pos;
1946 }
1947
1948 #else /* CONFIG_IEEE80211W */
1949
1950 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1951 {
1952 return 0;
1953 }
1954
1955
1956 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1957 {
1958 return pos;
1959 }
1960
1961 #endif /* CONFIG_IEEE80211W */
1962
1963
1964 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1965 {
1966 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1967 size_t gtk_len, kde_len;
1968 struct wpa_group *gsm = sm->group;
1969 u8 *wpa_ie;
1970 int wpa_ie_len, secure, keyidx, encr = 0;
1971
1972 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1973 sm->TimeoutEvt = FALSE;
1974
1975 sm->TimeoutCtr++;
1976 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1977 /* No point in sending the EAPOL-Key - we will disconnect
1978 * immediately following this. */
1979 return;
1980 }
1981
1982 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1983 GTK[GN], IGTK, [FTIE], [TIE * 2])
1984 */
1985 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1986 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1987 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1988 wpa_ie = sm->wpa_auth->wpa_ie;
1989 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1990 if (sm->wpa == WPA_VERSION_WPA &&
1991 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1992 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1993 /* WPA-only STA, remove RSN IE */
1994 wpa_ie = wpa_ie + wpa_ie[1] + 2;
1995 wpa_ie_len = wpa_ie[1] + 2;
1996 }
1997 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1998 "sending 3/4 msg of 4-Way Handshake");
1999 if (sm->wpa == WPA_VERSION_WPA2) {
2000 /* WPA2 send GTK in the 4-way handshake */
2001 secure = 1;
2002 gtk = gsm->GTK[gsm->GN - 1];
2003 gtk_len = gsm->GTK_len;
2004 if (sm->wpa_auth->conf.disable_gtk) {
2005 /*
2006 * Provide unique random GTK to each STA to prevent use
2007 * of GTK in the BSS.
2008 */
2009 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2010 return;
2011 gtk = dummy_gtk;
2012 }
2013 keyidx = gsm->GN;
2014 _rsc = rsc;
2015 encr = 1;
2016 } else {
2017 /* WPA does not include GTK in msg 3/4 */
2018 secure = 0;
2019 gtk = NULL;
2020 gtk_len = 0;
2021 keyidx = 0;
2022 _rsc = NULL;
2023 if (sm->rx_eapol_key_secure) {
2024 /*
2025 * It looks like Windows 7 supplicant tries to use
2026 * Secure bit in msg 2/4 after having reported Michael
2027 * MIC failure and it then rejects the 4-way handshake
2028 * if msg 3/4 does not set Secure bit. Work around this
2029 * by setting the Secure bit here even in the case of
2030 * WPA if the supplicant used it first.
2031 */
2032 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2033 "STA used Secure bit in WPA msg 2/4 - "
2034 "set Secure for 3/4 as workaround");
2035 secure = 1;
2036 }
2037 }
2038
2039 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2040 if (gtk)
2041 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2042 #ifdef CONFIG_IEEE80211R
2043 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2044 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2045 kde_len += 300; /* FTIE + 2 * TIE */
2046 }
2047 #endif /* CONFIG_IEEE80211R */
2048 #ifdef CONFIG_P2P
2049 if (WPA_GET_BE32(sm->ip_addr) > 0)
2050 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2051 #endif /* CONFIG_P2P */
2052 kde = os_malloc(kde_len);
2053 if (kde == NULL)
2054 return;
2055
2056 pos = kde;
2057 os_memcpy(pos, wpa_ie, wpa_ie_len);
2058 pos += wpa_ie_len;
2059 #ifdef CONFIG_IEEE80211R
2060 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2061 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
2062 if (res < 0) {
2063 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2064 "PMKR1Name into RSN IE in EAPOL-Key data");
2065 os_free(kde);
2066 return;
2067 }
2068 pos += res;
2069 }
2070 #endif /* CONFIG_IEEE80211R */
2071 if (gtk) {
2072 u8 hdr[2];
2073 hdr[0] = keyidx & 0x03;
2074 hdr[1] = 0;
2075 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2076 gtk, gtk_len);
2077 }
2078 pos = ieee80211w_kde_add(sm, pos);
2079
2080 #ifdef CONFIG_IEEE80211R
2081 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2082 int res;
2083 struct wpa_auth_config *conf;
2084
2085 conf = &sm->wpa_auth->conf;
2086 res = wpa_write_ftie(conf, conf->r0_key_holder,
2087 conf->r0_key_holder_len,
2088 NULL, NULL, pos, kde + kde_len - pos,
2089 NULL, 0);
2090 if (res < 0) {
2091 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2092 "into EAPOL-Key Key Data");
2093 os_free(kde);
2094 return;
2095 }
2096 pos += res;
2097
2098 /* TIE[ReassociationDeadline] (TU) */
2099 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2100 *pos++ = 5;
2101 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2102 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2103 pos += 4;
2104
2105 /* TIE[KeyLifetime] (seconds) */
2106 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2107 *pos++ = 5;
2108 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2109 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2110 pos += 4;
2111 }
2112 #endif /* CONFIG_IEEE80211R */
2113 #ifdef CONFIG_P2P
2114 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2115 u8 addr[3 * 4];
2116 os_memcpy(addr, sm->ip_addr, 4);
2117 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2118 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2119 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2120 addr, sizeof(addr), NULL, 0);
2121 }
2122 #endif /* CONFIG_P2P */
2123
2124 wpa_send_eapol(sm->wpa_auth, sm,
2125 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2126 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2127 WPA_KEY_INFO_KEY_TYPE,
2128 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2129 os_free(kde);
2130 }
2131
2132
2133 SM_STATE(WPA_PTK, PTKINITDONE)
2134 {
2135 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2136 sm->EAPOLKeyReceived = FALSE;
2137 if (sm->Pair) {
2138 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2139 int klen = wpa_cipher_key_len(sm->pairwise);
2140 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2141 sm->PTK.tk1, klen)) {
2142 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2143 return;
2144 }
2145 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2146 sm->pairwise_set = TRUE;
2147
2148 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2149 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2150 eloop_register_timeout(sm->wpa_auth->conf.
2151 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2152 sm->wpa_auth, sm);
2153 }
2154
2155 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2156 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2157 WPA_EAPOL_authorized, 1);
2158 }
2159 }
2160
2161 if (0 /* IBSS == TRUE */) {
2162 sm->keycount++;
2163 if (sm->keycount == 2) {
2164 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2165 WPA_EAPOL_portValid, 1);
2166 }
2167 } else {
2168 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2169 1);
2170 }
2171 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2172 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2173 if (sm->wpa == WPA_VERSION_WPA)
2174 sm->PInitAKeys = TRUE;
2175 else
2176 sm->has_GTK = TRUE;
2177 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2178 "pairwise key handshake completed (%s)",
2179 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2180
2181 #ifdef CONFIG_IEEE80211R
2182 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2183 #endif /* CONFIG_IEEE80211R */
2184 }
2185
2186
2187 SM_STEP(WPA_PTK)
2188 {
2189 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2190
2191 if (sm->Init)
2192 SM_ENTER(WPA_PTK, INITIALIZE);
2193 else if (sm->Disconnect
2194 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2195 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2196 "WPA_PTK: sm->Disconnect");
2197 SM_ENTER(WPA_PTK, DISCONNECT);
2198 }
2199 else if (sm->DeauthenticationRequest)
2200 SM_ENTER(WPA_PTK, DISCONNECTED);
2201 else if (sm->AuthenticationRequest)
2202 SM_ENTER(WPA_PTK, AUTHENTICATION);
2203 else if (sm->ReAuthenticationRequest)
2204 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2205 else if (sm->PTKRequest)
2206 SM_ENTER(WPA_PTK, PTKSTART);
2207 else switch (sm->wpa_ptk_state) {
2208 case WPA_PTK_INITIALIZE:
2209 break;
2210 case WPA_PTK_DISCONNECT:
2211 SM_ENTER(WPA_PTK, DISCONNECTED);
2212 break;
2213 case WPA_PTK_DISCONNECTED:
2214 SM_ENTER(WPA_PTK, INITIALIZE);
2215 break;
2216 case WPA_PTK_AUTHENTICATION:
2217 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2218 break;
2219 case WPA_PTK_AUTHENTICATION2:
2220 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2221 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2222 WPA_EAPOL_keyRun) > 0)
2223 SM_ENTER(WPA_PTK, INITPMK);
2224 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2225 /* FIX: && 802.1X::keyRun */)
2226 SM_ENTER(WPA_PTK, INITPSK);
2227 break;
2228 case WPA_PTK_INITPMK:
2229 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2230 WPA_EAPOL_keyAvailable) > 0)
2231 SM_ENTER(WPA_PTK, PTKSTART);
2232 else {
2233 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2234 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2235 "INITPMK - keyAvailable = false");
2236 SM_ENTER(WPA_PTK, DISCONNECT);
2237 }
2238 break;
2239 case WPA_PTK_INITPSK:
2240 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2241 NULL))
2242 SM_ENTER(WPA_PTK, PTKSTART);
2243 else {
2244 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2245 "no PSK configured for the STA");
2246 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2247 SM_ENTER(WPA_PTK, DISCONNECT);
2248 }
2249 break;
2250 case WPA_PTK_PTKSTART:
2251 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2252 sm->EAPOLKeyPairwise)
2253 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2254 else if (sm->TimeoutCtr >
2255 (int) dot11RSNAConfigPairwiseUpdateCount) {
2256 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2257 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2258 "PTKSTART: Retry limit %d reached",
2259 dot11RSNAConfigPairwiseUpdateCount);
2260 SM_ENTER(WPA_PTK, DISCONNECT);
2261 } else if (sm->TimeoutEvt)
2262 SM_ENTER(WPA_PTK, PTKSTART);
2263 break;
2264 case WPA_PTK_PTKCALCNEGOTIATING:
2265 if (sm->MICVerified)
2266 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2267 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2268 sm->EAPOLKeyPairwise)
2269 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2270 else if (sm->TimeoutEvt)
2271 SM_ENTER(WPA_PTK, PTKSTART);
2272 break;
2273 case WPA_PTK_PTKCALCNEGOTIATING2:
2274 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2275 break;
2276 case WPA_PTK_PTKINITNEGOTIATING:
2277 if (sm->update_snonce)
2278 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2279 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2280 sm->EAPOLKeyPairwise && sm->MICVerified)
2281 SM_ENTER(WPA_PTK, PTKINITDONE);
2282 else if (sm->TimeoutCtr >
2283 (int) dot11RSNAConfigPairwiseUpdateCount) {
2284 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2285 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2286 "PTKINITNEGOTIATING: Retry limit %d "
2287 "reached",
2288 dot11RSNAConfigPairwiseUpdateCount);
2289 SM_ENTER(WPA_PTK, DISCONNECT);
2290 } else if (sm->TimeoutEvt)
2291 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2292 break;
2293 case WPA_PTK_PTKINITDONE:
2294 break;
2295 }
2296 }
2297
2298
2299 SM_STATE(WPA_PTK_GROUP, IDLE)
2300 {
2301 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2302 if (sm->Init) {
2303 /* Init flag is not cleared here, so avoid busy
2304 * loop by claiming nothing changed. */
2305 sm->changed = FALSE;
2306 }
2307 sm->GTimeoutCtr = 0;
2308 }
2309
2310
2311 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2312 {
2313 u8 rsc[WPA_KEY_RSC_LEN];
2314 struct wpa_group *gsm = sm->group;
2315 u8 *kde, *pos, hdr[2];
2316 size_t kde_len;
2317 u8 *gtk, dummy_gtk[32];
2318
2319 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2320
2321 sm->GTimeoutCtr++;
2322 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2323 /* No point in sending the EAPOL-Key - we will disconnect
2324 * immediately following this. */
2325 return;
2326 }
2327
2328 if (sm->wpa == WPA_VERSION_WPA)
2329 sm->PInitAKeys = FALSE;
2330 sm->TimeoutEvt = FALSE;
2331 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2332 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2333 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2334 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2335 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2336 "sending 1/2 msg of Group Key Handshake");
2337
2338 gtk = gsm->GTK[gsm->GN - 1];
2339 if (sm->wpa_auth->conf.disable_gtk) {
2340 /*
2341 * Provide unique random GTK to each STA to prevent use
2342 * of GTK in the BSS.
2343 */
2344 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2345 return;
2346 gtk = dummy_gtk;
2347 }
2348 if (sm->wpa == WPA_VERSION_WPA2) {
2349 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2350 ieee80211w_kde_len(sm);
2351 kde = os_malloc(kde_len);
2352 if (kde == NULL)
2353 return;
2354
2355 pos = kde;
2356 hdr[0] = gsm->GN & 0x03;
2357 hdr[1] = 0;
2358 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2359 gtk, gsm->GTK_len);
2360 pos = ieee80211w_kde_add(sm, pos);
2361 } else {
2362 kde = gtk;
2363 pos = kde + gsm->GTK_len;
2364 }
2365
2366 wpa_send_eapol(sm->wpa_auth, sm,
2367 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2368 WPA_KEY_INFO_ACK |
2369 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2370 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2371 if (sm->wpa == WPA_VERSION_WPA2)
2372 os_free(kde);
2373 }
2374
2375
2376 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2377 {
2378 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2379 sm->EAPOLKeyReceived = FALSE;
2380 if (sm->GUpdateStationKeys)
2381 sm->group->GKeyDoneStations--;
2382 sm->GUpdateStationKeys = FALSE;
2383 sm->GTimeoutCtr = 0;
2384 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2385 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2386 "group key handshake completed (%s)",
2387 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2388 sm->has_GTK = TRUE;
2389 }
2390
2391
2392 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2393 {
2394 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2395 if (sm->GUpdateStationKeys)
2396 sm->group->GKeyDoneStations--;
2397 sm->GUpdateStationKeys = FALSE;
2398 sm->Disconnect = TRUE;
2399 }
2400
2401
2402 SM_STEP(WPA_PTK_GROUP)
2403 {
2404 if (sm->Init || sm->PtkGroupInit) {
2405 SM_ENTER(WPA_PTK_GROUP, IDLE);
2406 sm->PtkGroupInit = FALSE;
2407 } else switch (sm->wpa_ptk_group_state) {
2408 case WPA_PTK_GROUP_IDLE:
2409 if (sm->GUpdateStationKeys ||
2410 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2411 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2412 break;
2413 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2414 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2415 !sm->EAPOLKeyPairwise && sm->MICVerified)
2416 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2417 else if (sm->GTimeoutCtr >
2418 (int) dot11RSNAConfigGroupUpdateCount)
2419 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2420 else if (sm->TimeoutEvt)
2421 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2422 break;
2423 case WPA_PTK_GROUP_KEYERROR:
2424 SM_ENTER(WPA_PTK_GROUP, IDLE);
2425 break;
2426 case WPA_PTK_GROUP_REKEYESTABLISHED:
2427 SM_ENTER(WPA_PTK_GROUP, IDLE);
2428 break;
2429 }
2430 }
2431
2432
2433 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2434 struct wpa_group *group)
2435 {
2436 int ret = 0;
2437
2438 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2439 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2440 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2441 wpa_auth->addr, group->GNonce,
2442 group->GTK[group->GN - 1], group->GTK_len) < 0)
2443 ret = -1;
2444 wpa_hexdump_key(MSG_DEBUG, "GTK",
2445 group->GTK[group->GN - 1], group->GTK_len);
2446
2447 #ifdef CONFIG_IEEE80211W
2448 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2449 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2450 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2451 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2452 wpa_auth->addr, group->GNonce,
2453 group->IGTK[group->GN_igtk - 4],
2454 WPA_IGTK_LEN) < 0)
2455 ret = -1;
2456 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2457 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2458 }
2459 #endif /* CONFIG_IEEE80211W */
2460
2461 return ret;
2462 }
2463
2464
2465 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2466 struct wpa_group *group)
2467 {
2468 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2469 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2470 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2471 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2472
2473 /* GTK[0..N] = 0 */
2474 os_memset(group->GTK, 0, sizeof(group->GTK));
2475 group->GN = 1;
2476 group->GM = 2;
2477 #ifdef CONFIG_IEEE80211W
2478 group->GN_igtk = 4;
2479 group->GM_igtk = 5;
2480 #endif /* CONFIG_IEEE80211W */
2481 /* GTK[GN] = CalcGTK() */
2482 wpa_gtk_update(wpa_auth, group);
2483 }
2484
2485
2486 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2487 {
2488 if (ctx != NULL && ctx != sm->group)
2489 return 0;
2490
2491 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2492 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2493 "Not in PTKINITDONE; skip Group Key update");
2494 sm->GUpdateStationKeys = FALSE;
2495 return 0;
2496 }
2497 if (sm->GUpdateStationKeys) {
2498 /*
2499 * This should not really happen, so add a debug log entry.
2500 * Since we clear the GKeyDoneStations before the loop, the
2501 * station needs to be counted here anyway.
2502 */
2503 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2504 "GUpdateStationKeys was already set when "
2505 "marking station for GTK rekeying");
2506 }
2507
2508 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2509 if (sm->is_wnmsleep)
2510 return 0;
2511
2512 sm->group->GKeyDoneStations++;
2513 sm->GUpdateStationKeys = TRUE;
2514
2515 wpa_sm_step(sm);
2516 return 0;
2517 }
2518
2519
2520 #ifdef CONFIG_WNM
2521 /* update GTK when exiting WNM-Sleep Mode */
2522 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2523 {
2524 if (sm == NULL || sm->is_wnmsleep)
2525 return;
2526
2527 wpa_group_update_sta(sm, NULL);
2528 }
2529
2530
2531 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2532 {
2533 if (sm)
2534 sm->is_wnmsleep = !!flag;
2535 }
2536
2537
2538 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2539 {
2540 struct wpa_group *gsm = sm->group;
2541 u8 *start = pos;
2542
2543 /*
2544 * GTK subelement:
2545 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2546 * Key[5..32]
2547 */
2548 *pos++ = WNM_SLEEP_SUBELEM_GTK;
2549 *pos++ = 11 + gsm->GTK_len;
2550 /* Key ID in B0-B1 of Key Info */
2551 WPA_PUT_LE16(pos, gsm->GN & 0x03);
2552 pos += 2;
2553 *pos++ = gsm->GTK_len;
2554 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2555 return 0;
2556 pos += 8;
2557 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2558 pos += gsm->GTK_len;
2559
2560 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2561 gsm->GN);
2562 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2563 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2564
2565 return pos - start;
2566 }
2567
2568
2569 #ifdef CONFIG_IEEE80211W
2570 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2571 {
2572 struct wpa_group *gsm = sm->group;
2573 u8 *start = pos;
2574
2575 /*
2576 * IGTK subelement:
2577 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2578 */
2579 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2580 *pos++ = 2 + 6 + WPA_IGTK_LEN;
2581 WPA_PUT_LE16(pos, gsm->GN_igtk);
2582 pos += 2;
2583 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2584 return 0;
2585 pos += 6;
2586
2587 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2588 pos += WPA_IGTK_LEN;
2589
2590 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2591 gsm->GN_igtk);
2592 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2593 gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2594
2595 return pos - start;
2596 }
2597 #endif /* CONFIG_IEEE80211W */
2598 #endif /* CONFIG_WNM */
2599
2600
2601 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2602 struct wpa_group *group)
2603 {
2604 int tmp;
2605
2606 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2607 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2608 group->changed = TRUE;
2609 group->wpa_group_state = WPA_GROUP_SETKEYS;
2610 group->GTKReKey = FALSE;
2611 tmp = group->GM;
2612 group->GM = group->GN;
2613 group->GN = tmp;
2614 #ifdef CONFIG_IEEE80211W
2615 tmp = group->GM_igtk;
2616 group->GM_igtk = group->GN_igtk;
2617 group->GN_igtk = tmp;
2618 #endif /* CONFIG_IEEE80211W */
2619 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2620 * counting the STAs that are marked with GUpdateStationKeys instead of
2621 * including all STAs that could be in not-yet-completed state. */
2622 wpa_gtk_update(wpa_auth, group);
2623
2624 if (group->GKeyDoneStations) {
2625 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2626 "GKeyDoneStations=%d when starting new GTK rekey",
2627 group->GKeyDoneStations);
2628 group->GKeyDoneStations = 0;
2629 }
2630 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2631 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2632 group->GKeyDoneStations);
2633 }
2634
2635
2636 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2637 struct wpa_group *group)
2638 {
2639 int ret = 0;
2640
2641 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2642 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2643 broadcast_ether_addr, group->GN,
2644 group->GTK[group->GN - 1], group->GTK_len) < 0)
2645 ret = -1;
2646
2647 #ifdef CONFIG_IEEE80211W
2648 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2649 wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2650 broadcast_ether_addr, group->GN_igtk,
2651 group->IGTK[group->GN_igtk - 4],
2652 WPA_IGTK_LEN) < 0)
2653 ret = -1;
2654 #endif /* CONFIG_IEEE80211W */
2655
2656 return ret;
2657 }
2658
2659
2660 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
2661 {
2662 if (sm->group == ctx) {
2663 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
2664 " for discconnection due to fatal failure",
2665 MAC2STR(sm->addr));
2666 sm->Disconnect = TRUE;
2667 }
2668
2669 return 0;
2670 }
2671
2672
2673 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
2674 struct wpa_group *group)
2675 {
2676 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
2677 group->changed = TRUE;
2678 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
2679 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
2680 }
2681
2682
2683 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2684 struct wpa_group *group)
2685 {
2686 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2687 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2688 group->changed = TRUE;
2689 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2690
2691 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
2692 wpa_group_fatal_failure(wpa_auth, group);
2693 return -1;
2694 }
2695
2696 return 0;
2697 }
2698
2699
2700 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2701 struct wpa_group *group)
2702 {
2703 if (group->GInit) {
2704 wpa_group_gtk_init(wpa_auth, group);
2705 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
2706 /* Do not allow group operations */
2707 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2708 group->GTKAuthenticator) {
2709 wpa_group_setkeysdone(wpa_auth, group);
2710 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2711 group->GTKReKey) {
2712 wpa_group_setkeys(wpa_auth, group);
2713 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2714 if (group->GKeyDoneStations == 0)
2715 wpa_group_setkeysdone(wpa_auth, group);
2716 else if (group->GTKReKey)
2717 wpa_group_setkeys(wpa_auth, group);
2718 }
2719 }
2720
2721
2722 static int wpa_sm_step(struct wpa_state_machine *sm)
2723 {
2724 if (sm == NULL)
2725 return 0;
2726
2727 if (sm->in_step_loop) {
2728 /* This should not happen, but if it does, make sure we do not
2729 * end up freeing the state machine too early by exiting the
2730 * recursive call. */
2731 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2732 return 0;
2733 }
2734
2735 sm->in_step_loop = 1;
2736 do {
2737 if (sm->pending_deinit)
2738 break;
2739
2740 sm->changed = FALSE;
2741 sm->wpa_auth->group->changed = FALSE;
2742
2743 SM_STEP_RUN(WPA_PTK);
2744 if (sm->pending_deinit)
2745 break;
2746 SM_STEP_RUN(WPA_PTK_GROUP);
2747 if (sm->pending_deinit)
2748 break;
2749 wpa_group_sm_step(sm->wpa_auth, sm->group);
2750 } while (sm->changed || sm->wpa_auth->group->changed);
2751 sm->in_step_loop = 0;
2752
2753 if (sm->pending_deinit) {
2754 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2755 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2756 wpa_free_sta_sm(sm);
2757 return 1;
2758 }
2759 return 0;
2760 }
2761
2762
2763 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2764 {
2765 struct wpa_state_machine *sm = eloop_ctx;
2766 wpa_sm_step(sm);
2767 }
2768
2769
2770 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2771 {
2772 if (sm == NULL)
2773 return;
2774 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2775 }
2776
2777
2778 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2779 {
2780 int tmp, i;
2781 struct wpa_group *group;
2782
2783 if (wpa_auth == NULL)
2784 return;
2785
2786 group = wpa_auth->group;
2787
2788 for (i = 0; i < 2; i++) {
2789 tmp = group->GM;
2790 group->GM = group->GN;
2791 group->GN = tmp;
2792 #ifdef CONFIG_IEEE80211W
2793 tmp = group->GM_igtk;
2794 group->GM_igtk = group->GN_igtk;
2795 group->GN_igtk = tmp;
2796 #endif /* CONFIG_IEEE80211W */
2797 wpa_gtk_update(wpa_auth, group);
2798 wpa_group_config_group_keys(wpa_auth, group);
2799 }
2800 }
2801
2802
2803 static const char * wpa_bool_txt(int bool)
2804 {
2805 return bool ? "TRUE" : "FALSE";
2806 }
2807
2808
2809 #define RSN_SUITE "%02x-%02x-%02x-%d"
2810 #define RSN_SUITE_ARG(s) \
2811 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2812
2813 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2814 {
2815 int len = 0, ret;
2816 char pmkid_txt[PMKID_LEN * 2 + 1];
2817 #ifdef CONFIG_RSN_PREAUTH
2818 const int preauth = 1;
2819 #else /* CONFIG_RSN_PREAUTH */
2820 const int preauth = 0;
2821 #endif /* CONFIG_RSN_PREAUTH */
2822
2823 if (wpa_auth == NULL)
2824 return len;
2825
2826 ret = os_snprintf(buf + len, buflen - len,
2827 "dot11RSNAOptionImplemented=TRUE\n"
2828 "dot11RSNAPreauthenticationImplemented=%s\n"
2829 "dot11RSNAEnabled=%s\n"
2830 "dot11RSNAPreauthenticationEnabled=%s\n",
2831 wpa_bool_txt(preauth),
2832 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2833 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2834 if (ret < 0 || (size_t) ret >= buflen - len)
2835 return len;
2836 len += ret;
2837
2838 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2839 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2840
2841 ret = os_snprintf(
2842 buf + len, buflen - len,
2843 "dot11RSNAConfigVersion=%u\n"
2844 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2845 /* FIX: dot11RSNAConfigGroupCipher */
2846 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2847 /* FIX: dot11RSNAConfigGroupRekeyTime */
2848 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2849 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2850 "dot11RSNAConfigGroupUpdateCount=%u\n"
2851 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2852 "dot11RSNAConfigGroupCipherSize=%u\n"
2853 "dot11RSNAConfigPMKLifetime=%u\n"
2854 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2855 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2856 "dot11RSNAConfigSATimeout=%u\n"
2857 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2858 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2859 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2860 "dot11RSNAPMKIDUsed=%s\n"
2861 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2862 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2863 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2864 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2865 "dot11RSNA4WayHandshakeFailures=%u\n"
2866 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2867 RSN_VERSION,
2868 !!wpa_auth->conf.wpa_strict_rekey,
2869 dot11RSNAConfigGroupUpdateCount,
2870 dot11RSNAConfigPairwiseUpdateCount,
2871 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2872 dot11RSNAConfigPMKLifetime,
2873 dot11RSNAConfigPMKReauthThreshold,
2874 dot11RSNAConfigSATimeout,
2875 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2876 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2877 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2878 pmkid_txt,
2879 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2880 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2881 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2882 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2883 wpa_auth->dot11RSNA4WayHandshakeFailures);
2884 if (ret < 0 || (size_t) ret >= buflen - len)
2885 return len;
2886 len += ret;
2887
2888 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2889 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2890
2891 /* Private MIB */
2892 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2893 wpa_auth->group->wpa_group_state);
2894 if (ret < 0 || (size_t) ret >= buflen - len)
2895 return len;
2896 len += ret;
2897
2898 return len;
2899 }
2900
2901
2902 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2903 {
2904 int len = 0, ret;
2905 u32 pairwise = 0;
2906
2907 if (sm == NULL)
2908 return 0;
2909
2910 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2911
2912 /* dot11RSNAStatsEntry */
2913
2914 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2915 WPA_PROTO_RSN : WPA_PROTO_WPA,
2916 sm->pairwise);
2917 if (pairwise == 0)
2918 return 0;
2919
2920 ret = os_snprintf(
2921 buf + len, buflen - len,
2922 /* TODO: dot11RSNAStatsIndex */
2923 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2924 "dot11RSNAStatsVersion=1\n"
2925 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2926 /* TODO: dot11RSNAStatsTKIPICVErrors */
2927 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2928 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2929 /* TODO: dot11RSNAStatsCCMPReplays */
2930 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2931 /* TODO: dot11RSNAStatsTKIPReplays */,
2932 MAC2STR(sm->addr),
2933 RSN_SUITE_ARG(pairwise),
2934 sm->dot11RSNAStatsTKIPLocalMICFailures,
2935 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2936 if (ret < 0 || (size_t) ret >= buflen - len)
2937 return len;
2938 len += ret;
2939
2940 /* Private MIB */
2941 ret = os_snprintf(buf + len, buflen - len,
2942 "hostapdWPAPTKState=%d\n"
2943 "hostapdWPAPTKGroupState=%d\n",
2944 sm->wpa_ptk_state,
2945 sm->wpa_ptk_group_state);
2946 if (ret < 0 || (size_t) ret >= buflen - len)
2947 return len;
2948 len += ret;
2949
2950 return len;
2951 }
2952
2953
2954 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2955 {
2956 if (wpa_auth)
2957 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2958 }
2959
2960
2961 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2962 {
2963 return sm && sm->pairwise_set;
2964 }
2965
2966
2967 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2968 {
2969 return sm->pairwise;
2970 }
2971
2972
2973 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2974 {
2975 if (sm == NULL)
2976 return -1;
2977 return sm->wpa_key_mgmt;
2978 }
2979
2980
2981 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2982 {
2983 if (sm == NULL)
2984 return 0;
2985 return sm->wpa;
2986 }
2987
2988
2989 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2990 struct rsn_pmksa_cache_entry *entry)
2991 {
2992 if (sm == NULL || sm->pmksa != entry)
2993 return -1;
2994 sm->pmksa = NULL;
2995 return 0;
2996 }
2997
2998
2999 struct rsn_pmksa_cache_entry *
3000 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3001 {
3002 return sm ? sm->pmksa : NULL;
3003 }
3004
3005
3006 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3007 {
3008 if (sm)
3009 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3010 }
3011
3012
3013 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3014 {
3015 if (wpa_auth == NULL)
3016 return NULL;
3017 *len = wpa_auth->wpa_ie_len;
3018 return wpa_auth->wpa_ie;
3019 }
3020
3021
3022 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3023 int session_timeout, struct eapol_state_machine *eapol)
3024 {
3025 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3026 sm->wpa_auth->conf.disable_pmksa_caching)
3027 return -1;
3028
3029 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
3030 sm->wpa_auth->addr, sm->addr, session_timeout,
3031 eapol, sm->wpa_key_mgmt))
3032 return 0;
3033
3034 return -1;
3035 }
3036
3037
3038 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3039 const u8 *pmk, size_t len, const u8 *sta_addr,
3040 int session_timeout,
3041 struct eapol_state_machine *eapol)
3042 {
3043 if (wpa_auth == NULL)
3044 return -1;
3045
3046 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
3047 sta_addr, session_timeout, eapol,
3048 WPA_KEY_MGMT_IEEE8021X))
3049 return 0;
3050
3051 return -1;
3052 }
3053
3054
3055 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3056 const u8 *sta_addr)
3057 {
3058 struct rsn_pmksa_cache_entry *pmksa;
3059
3060 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3061 return;
3062 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3063 if (pmksa) {
3064 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3065 MACSTR " based on request", MAC2STR(sta_addr));
3066 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3067 }
3068 }
3069
3070
3071 static struct wpa_group *
3072 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3073 {
3074 struct wpa_group *group;
3075
3076 if (wpa_auth == NULL || wpa_auth->group == NULL)
3077 return NULL;
3078
3079 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3080 vlan_id);
3081 group = wpa_group_init(wpa_auth, vlan_id, 0);
3082 if (group == NULL)
3083 return NULL;
3084
3085 group->next = wpa_auth->group->next;
3086 wpa_auth->group->next = group;
3087
3088 return group;
3089 }
3090
3091
3092 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3093 {
3094 struct wpa_group *group;
3095
3096 if (sm == NULL || sm->wpa_auth == NULL)
3097 return 0;
3098
3099 group = sm->wpa_auth->group;
3100 while (group) {
3101 if (group->vlan_id == vlan_id)
3102 break;
3103 group = group->next;
3104 }
3105
3106 if (group == NULL) {
3107 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3108 if (group == NULL)
3109 return -1;
3110 }
3111
3112 if (sm->group == group)
3113 return 0;
3114
3115 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3116 return -1;
3117
3118 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3119 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3120
3121 sm->group = group;
3122 return 0;
3123 }
3124
3125
3126 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3127 struct wpa_state_machine *sm, int ack)
3128 {
3129 if (wpa_auth == NULL || sm == NULL)
3130 return;
3131 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3132 " ack=%d", MAC2STR(sm->addr), ack);
3133 if (sm->pending_1_of_4_timeout && ack) {
3134 /*
3135 * Some deployed supplicant implementations update their SNonce
3136 * for each EAPOL-Key 2/4 message even within the same 4-way
3137 * handshake and then fail to use the first SNonce when
3138 * deriving the PTK. This results in unsuccessful 4-way
3139 * handshake whenever the relatively short initial timeout is
3140 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3141 * around this by increasing the timeout now that we know that
3142 * the station has received the frame.
3143 */
3144 int timeout_ms = eapol_key_timeout_subseq;
3145 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3146 "timeout by %u ms because of acknowledged frame",
3147 timeout_ms);
3148 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3149 eloop_register_timeout(timeout_ms / 1000,
3150 (timeout_ms % 1000) * 1000,
3151 wpa_send_eapol_timeout, wpa_auth, sm);
3152 }
3153 }
3154
3155
3156 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3157 {
3158 if (sm == NULL)
3159 return 0;
3160 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3161 }
3162
3163
3164 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3165 {
3166 if (sm == NULL)
3167 return 0;
3168 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3169 }
3170
3171
3172 #ifdef CONFIG_P2P
3173 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3174 {
3175 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3176 return -1;
3177 os_memcpy(addr, sm->ip_addr, 4);
3178 return 0;
3179 }
3180 #endif /* CONFIG_P2P */
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