1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2011, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/state_machine.h"
14 #include "common/ieee802_11_defs.h"
15 #include "crypto/aes_wrap.h"
16 #include "crypto/crypto.h"
17 #include "crypto/sha1.h"
18 #include "crypto/sha256.h"
19 #include "crypto/random.h"
20 #include "eapol_auth/eapol_auth_sm.h"
21 #include "ap_config.h"
22 #include "ieee802_11.h"
23 #include "wpa_auth.h"
24 #include "pmksa_cache_auth.h"
25 #include "wpa_auth_i.h"
26 #include "wpa_auth_ie.h"
27
28 #define STATE_MACHINE_DATA struct wpa_state_machine
29 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
30 #define STATE_MACHINE_ADDR sm->addr
31
32
33 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
34 static int wpa_sm_step(struct wpa_state_machine *sm);
35 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
36 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
37 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
38 struct wpa_group *group);
39 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
40 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
41 struct wpa_group *group);
42 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
43 struct wpa_group *group);
44
45 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
46 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
47 static const u32 eapol_key_timeout_first = 100; /* ms */
48 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
49 static const u32 eapol_key_timeout_first_group = 500; /* ms */
50
51 /* TODO: make these configurable */
52 static const int dot11RSNAConfigPMKLifetime = 43200;
53 static const int dot11RSNAConfigPMKReauthThreshold = 70;
54 static const int dot11RSNAConfigSATimeout = 60;
55
56
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)57 static inline void wpa_auth_mic_failure_report(
58 struct wpa_authenticator *wpa_auth, const u8 *addr)
59 {
60 if (wpa_auth->cb.mic_failure_report)
61 wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
62 }
63
64
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)65 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
66 const u8 *addr, wpa_eapol_variable var,
67 int value)
68 {
69 if (wpa_auth->cb.set_eapol)
70 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
71 }
72
73
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)74 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
75 const u8 *addr, wpa_eapol_variable var)
76 {
77 if (wpa_auth->cb.get_eapol == NULL)
78 return -1;
79 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
80 }
81
82
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * prev_psk)83 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
84 const u8 *addr, const u8 *prev_psk)
85 {
86 if (wpa_auth->cb.get_psk == NULL)
87 return NULL;
88 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk);
89 }
90
91
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)92 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
93 const u8 *addr, u8 *msk, size_t *len)
94 {
95 if (wpa_auth->cb.get_msk == NULL)
96 return -1;
97 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
98 }
99
100
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)101 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
102 int vlan_id,
103 enum wpa_alg alg, const u8 *addr, int idx,
104 u8 *key, size_t key_len)
105 {
106 if (wpa_auth->cb.set_key == NULL)
107 return -1;
108 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
109 key, key_len);
110 }
111
112
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)113 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
114 const u8 *addr, int idx, u8 *seq)
115 {
116 if (wpa_auth->cb.get_seqnum == NULL)
117 return -1;
118 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
119 }
120
121
122 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)123 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
124 const u8 *data, size_t data_len, int encrypt)
125 {
126 if (wpa_auth->cb.send_eapol == NULL)
127 return -1;
128 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
129 encrypt);
130 }
131
132
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)133 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
134 int (*cb)(struct wpa_state_machine *sm, void *ctx),
135 void *cb_ctx)
136 {
137 if (wpa_auth->cb.for_each_sta == NULL)
138 return 0;
139 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
140 }
141
142
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)143 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
144 int (*cb)(struct wpa_authenticator *a, void *ctx),
145 void *cb_ctx)
146 {
147 if (wpa_auth->cb.for_each_auth == NULL)
148 return 0;
149 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
150 }
151
152
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)153 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
154 logger_level level, const char *txt)
155 {
156 if (wpa_auth->cb.logger == NULL)
157 return;
158 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
159 }
160
161
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)162 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
163 logger_level level, const char *fmt, ...)
164 {
165 char *format;
166 int maxlen;
167 va_list ap;
168
169 if (wpa_auth->cb.logger == NULL)
170 return;
171
172 maxlen = os_strlen(fmt) + 100;
173 format = os_malloc(maxlen);
174 if (!format)
175 return;
176
177 va_start(ap, fmt);
178 vsnprintf(format, maxlen, fmt, ap);
179 va_end(ap);
180
181 wpa_auth_logger(wpa_auth, addr, level, format);
182
183 os_free(format);
184 }
185
186
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr)187 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
188 const u8 *addr)
189 {
190 if (wpa_auth->cb.disconnect == NULL)
191 return;
192 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
193 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
194 WLAN_REASON_PREV_AUTH_NOT_VALID);
195 }
196
197
wpa_use_aes_cmac(struct wpa_state_machine * sm)198 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
199 {
200 int ret = 0;
201 #ifdef CONFIG_IEEE80211R
202 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
203 ret = 1;
204 #endif /* CONFIG_IEEE80211R */
205 #ifdef CONFIG_IEEE80211W
206 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
207 ret = 1;
208 #endif /* CONFIG_IEEE80211W */
209 return ret;
210 }
211
212
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)213 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
214 {
215 struct wpa_authenticator *wpa_auth = eloop_ctx;
216
217 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
218 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
219 "initialization.");
220 } else {
221 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
222 wpa_hexdump_key(MSG_DEBUG, "GMK",
223 wpa_auth->group->GMK, WPA_GMK_LEN);
224 }
225
226 if (wpa_auth->conf.wpa_gmk_rekey) {
227 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
228 wpa_rekey_gmk, wpa_auth, NULL);
229 }
230 }
231
232
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)233 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
234 {
235 struct wpa_authenticator *wpa_auth = eloop_ctx;
236 struct wpa_group *group;
237
238 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
239 for (group = wpa_auth->group; group; group = group->next) {
240 group->GTKReKey = TRUE;
241 do {
242 group->changed = FALSE;
243 wpa_group_sm_step(wpa_auth, group);
244 } while (group->changed);
245 }
246
247 if (wpa_auth->conf.wpa_group_rekey) {
248 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
249 0, wpa_rekey_gtk, wpa_auth, NULL);
250 }
251 }
252
253
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)254 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
255 {
256 struct wpa_authenticator *wpa_auth = eloop_ctx;
257 struct wpa_state_machine *sm = timeout_ctx;
258
259 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
260 wpa_request_new_ptk(sm);
261 wpa_sm_step(sm);
262 }
263
264
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)265 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
266 {
267 if (sm->pmksa == ctx)
268 sm->pmksa = NULL;
269 return 0;
270 }
271
272
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)273 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
274 void *ctx)
275 {
276 struct wpa_authenticator *wpa_auth = ctx;
277 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
278 }
279
280
wpa_group_set_key_len(struct wpa_group * group,int cipher)281 static void wpa_group_set_key_len(struct wpa_group *group, int cipher)
282 {
283 switch (cipher) {
284 case WPA_CIPHER_CCMP:
285 group->GTK_len = 16;
286 break;
287 case WPA_CIPHER_TKIP:
288 group->GTK_len = 32;
289 break;
290 case WPA_CIPHER_WEP104:
291 group->GTK_len = 13;
292 break;
293 case WPA_CIPHER_WEP40:
294 group->GTK_len = 5;
295 break;
296 }
297 }
298
299
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)300 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
301 struct wpa_group *group)
302 {
303 u8 buf[ETH_ALEN + 8 + sizeof(group)];
304 u8 rkey[32];
305
306 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
307 return -1;
308 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
309
310 /*
311 * Counter = PRF-256(Random number, "Init Counter",
312 * Local MAC Address || Time)
313 */
314 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
315 wpa_get_ntp_timestamp(buf + ETH_ALEN);
316 os_memcpy(buf + ETH_ALEN + 8, &group, sizeof(group));
317 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
318 return -1;
319
320 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
321 group->Counter, WPA_NONCE_LEN) < 0)
322 return -1;
323 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
324 group->Counter, WPA_NONCE_LEN);
325
326 return 0;
327 }
328
329
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)330 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
331 int vlan_id, int delay_init)
332 {
333 struct wpa_group *group;
334
335 group = os_zalloc(sizeof(struct wpa_group));
336 if (group == NULL)
337 return NULL;
338
339 group->GTKAuthenticator = TRUE;
340 group->vlan_id = vlan_id;
341
342 wpa_group_set_key_len(group, wpa_auth->conf.wpa_group);
343
344 if (random_pool_ready() != 1) {
345 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
346 "for secure operations - update keys later when "
347 "the first station connects");
348 }
349
350 /*
351 * Set initial GMK/Counter value here. The actual values that will be
352 * used in negotiations will be set once the first station tries to
353 * connect. This allows more time for collecting additional randomness
354 * on embedded devices.
355 */
356 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
357 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
358 "initialization.");
359 os_free(group);
360 return NULL;
361 }
362
363 group->GInit = TRUE;
364 if (delay_init) {
365 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
366 "until Beacon frames have been configured");
367 /* Initialization is completed in wpa_init_keys(). */
368 } else {
369 wpa_group_sm_step(wpa_auth, group);
370 group->GInit = FALSE;
371 wpa_group_sm_step(wpa_auth, group);
372 }
373
374 return group;
375 }
376
377
378 /**
379 * wpa_init - Initialize WPA authenticator
380 * @addr: Authenticator address
381 * @conf: Configuration for WPA authenticator
382 * @cb: Callback functions for WPA authenticator
383 * Returns: Pointer to WPA authenticator data or %NULL on failure
384 */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,struct wpa_auth_callbacks * cb)385 struct wpa_authenticator * wpa_init(const u8 *addr,
386 struct wpa_auth_config *conf,
387 struct wpa_auth_callbacks *cb)
388 {
389 struct wpa_authenticator *wpa_auth;
390
391 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
392 if (wpa_auth == NULL)
393 return NULL;
394 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
395 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
396 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
397
398 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
399 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
400 os_free(wpa_auth);
401 return NULL;
402 }
403
404 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
405 if (wpa_auth->group == NULL) {
406 os_free(wpa_auth->wpa_ie);
407 os_free(wpa_auth);
408 return NULL;
409 }
410
411 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
412 wpa_auth);
413 if (wpa_auth->pmksa == NULL) {
414 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
415 os_free(wpa_auth->wpa_ie);
416 os_free(wpa_auth);
417 return NULL;
418 }
419
420 #ifdef CONFIG_IEEE80211R
421 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
422 if (wpa_auth->ft_pmk_cache == NULL) {
423 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
424 os_free(wpa_auth->wpa_ie);
425 pmksa_cache_auth_deinit(wpa_auth->pmksa);
426 os_free(wpa_auth);
427 return NULL;
428 }
429 #endif /* CONFIG_IEEE80211R */
430
431 if (wpa_auth->conf.wpa_gmk_rekey) {
432 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
433 wpa_rekey_gmk, wpa_auth, NULL);
434 }
435
436 if (wpa_auth->conf.wpa_group_rekey) {
437 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
438 wpa_rekey_gtk, wpa_auth, NULL);
439 }
440
441 return wpa_auth;
442 }
443
444
wpa_init_keys(struct wpa_authenticator * wpa_auth)445 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
446 {
447 struct wpa_group *group = wpa_auth->group;
448
449 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
450 "keys");
451 wpa_group_sm_step(wpa_auth, group);
452 group->GInit = FALSE;
453 wpa_group_sm_step(wpa_auth, group);
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 */
wpa_deinit(struct wpa_authenticator * wpa_auth)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 os_free(wpa_auth->wpa_ie);
482
483 group = wpa_auth->group;
484 while (group) {
485 prev = group;
486 group = group->next;
487 os_free(prev);
488 }
489
490 os_free(wpa_auth);
491 }
492
493
494 /**
495 * wpa_reconfig - Update WPA authenticator configuration
496 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
497 * @conf: Configuration for WPA authenticator
498 */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)499 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
500 struct wpa_auth_config *conf)
501 {
502 struct wpa_group *group;
503 if (wpa_auth == NULL)
504 return 0;
505
506 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
507 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
508 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
509 return -1;
510 }
511
512 /*
513 * Reinitialize GTK to make sure it is suitable for the new
514 * configuration.
515 */
516 group = wpa_auth->group;
517 wpa_group_set_key_len(group, wpa_auth->conf.wpa_group);
518 group->GInit = TRUE;
519 wpa_group_sm_step(wpa_auth, group);
520 group->GInit = FALSE;
521 wpa_group_sm_step(wpa_auth, group);
522
523 return 0;
524 }
525
526
527 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr)528 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr)
529 {
530 struct wpa_state_machine *sm;
531
532 sm = os_zalloc(sizeof(struct wpa_state_machine));
533 if (sm == NULL)
534 return NULL;
535 os_memcpy(sm->addr, addr, ETH_ALEN);
536
537 sm->wpa_auth = wpa_auth;
538 sm->group = wpa_auth->group;
539
540 return sm;
541 }
542
543
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)544 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
545 struct wpa_state_machine *sm)
546 {
547 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
548 return -1;
549
550 #ifdef CONFIG_IEEE80211R
551 if (sm->ft_completed) {
552 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
553 "FT authentication already completed - do not "
554 "start 4-way handshake");
555 return 0;
556 }
557 #endif /* CONFIG_IEEE80211R */
558
559 if (sm->started) {
560 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
561 sm->ReAuthenticationRequest = TRUE;
562 return wpa_sm_step(sm);
563 }
564
565 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
566 "start authentication");
567 sm->started = 1;
568
569 sm->Init = TRUE;
570 if (wpa_sm_step(sm) == 1)
571 return 1; /* should not really happen */
572 sm->Init = FALSE;
573 sm->AuthenticationRequest = TRUE;
574 return wpa_sm_step(sm);
575 }
576
577
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)578 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
579 {
580 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
581 * reassociates back to the same AP while the previous entry for the
582 * STA has not yet been removed. */
583 if (sm == NULL)
584 return;
585
586 sm->wpa_key_mgmt = 0;
587 }
588
589
wpa_free_sta_sm(struct wpa_state_machine * sm)590 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
591 {
592 if (sm->GUpdateStationKeys) {
593 sm->group->GKeyDoneStations--;
594 sm->GUpdateStationKeys = FALSE;
595 }
596 #ifdef CONFIG_IEEE80211R
597 os_free(sm->assoc_resp_ftie);
598 #endif /* CONFIG_IEEE80211R */
599 os_free(sm->last_rx_eapol_key);
600 os_free(sm->wpa_ie);
601 os_free(sm);
602 }
603
604
wpa_auth_sta_deinit(struct wpa_state_machine * sm)605 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
606 {
607 if (sm == NULL)
608 return;
609
610 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
611 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
612 "strict rekeying - force GTK rekey since STA "
613 "is leaving");
614 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
615 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
616 NULL);
617 }
618
619 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
620 sm->pending_1_of_4_timeout = 0;
621 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
622 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
623 if (sm->in_step_loop) {
624 /* Must not free state machine while wpa_sm_step() is running.
625 * Freeing will be completed in the end of wpa_sm_step(). */
626 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
627 "machine deinit for " MACSTR, MAC2STR(sm->addr));
628 sm->pending_deinit = 1;
629 } else
630 wpa_free_sta_sm(sm);
631 }
632
633
wpa_request_new_ptk(struct wpa_state_machine * sm)634 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
635 {
636 if (sm == NULL)
637 return;
638
639 sm->PTKRequest = TRUE;
640 sm->PTK_valid = 0;
641 }
642
643
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)644 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
645 const u8 *replay_counter)
646 {
647 int i;
648 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
649 if (!ctr[i].valid)
650 break;
651 if (os_memcmp(replay_counter, ctr[i].counter,
652 WPA_REPLAY_COUNTER_LEN) == 0)
653 return 1;
654 }
655 return 0;
656 }
657
658
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)659 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
660 const u8 *replay_counter)
661 {
662 int i;
663 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
664 if (ctr[i].valid &&
665 (replay_counter == NULL ||
666 os_memcmp(replay_counter, ctr[i].counter,
667 WPA_REPLAY_COUNTER_LEN) == 0))
668 ctr[i].valid = FALSE;
669 }
670 }
671
672
673 #ifdef CONFIG_IEEE80211R
ft_check_msg_2_of_4(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,struct wpa_eapol_ie_parse * kde)674 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
675 struct wpa_state_machine *sm,
676 struct wpa_eapol_ie_parse *kde)
677 {
678 struct wpa_ie_data ie;
679 struct rsn_mdie *mdie;
680
681 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
682 ie.num_pmkid != 1 || ie.pmkid == NULL) {
683 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
684 "FT 4-way handshake message 2/4");
685 return -1;
686 }
687
688 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
689 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
690 sm->sup_pmk_r1_name, PMKID_LEN);
691
692 if (!kde->mdie || !kde->ftie) {
693 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
694 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
695 return -1;
696 }
697
698 mdie = (struct rsn_mdie *) (kde->mdie + 2);
699 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
700 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
701 MOBILITY_DOMAIN_ID_LEN) != 0) {
702 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
703 return -1;
704 }
705
706 if (sm->assoc_resp_ftie &&
707 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
708 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
709 2 + sm->assoc_resp_ftie[1]) != 0)) {
710 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
711 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
712 kde->ftie, kde->ftie_len);
713 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
714 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
715 return -1;
716 }
717
718 return 0;
719 }
720 #endif /* CONFIG_IEEE80211R */
721
722
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)723 static void wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
724 struct wpa_state_machine *sm, int group)
725 {
726 /* Supplicant reported a Michael MIC error */
727 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
728 "received EAPOL-Key Error Request "
729 "(STA detected Michael MIC failure (group=%d))",
730 group);
731
732 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
733 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
734 "ignore Michael MIC failure report since "
735 "group cipher is not TKIP");
736 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
737 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
738 "ignore Michael MIC failure report since "
739 "pairwise cipher is not TKIP");
740 } else {
741 wpa_auth_mic_failure_report(wpa_auth, sm->addr);
742 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
743 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
744 }
745
746 /*
747 * Error report is not a request for a new key handshake, but since
748 * Authenticator may do it, let's change the keys now anyway.
749 */
750 wpa_request_new_ptk(sm);
751 }
752
753
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)754 void wpa_receive(struct wpa_authenticator *wpa_auth,
755 struct wpa_state_machine *sm,
756 u8 *data, size_t data_len)
757 {
758 struct ieee802_1x_hdr *hdr;
759 struct wpa_eapol_key *key;
760 u16 key_info, key_data_length;
761 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
762 SMK_M1, SMK_M3, SMK_ERROR } msg;
763 char *msgtxt;
764 struct wpa_eapol_ie_parse kde;
765 int ft;
766 const u8 *eapol_key_ie;
767 size_t eapol_key_ie_len;
768
769 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
770 return;
771
772 if (data_len < sizeof(*hdr) + sizeof(*key))
773 return;
774
775 hdr = (struct ieee802_1x_hdr *) data;
776 key = (struct wpa_eapol_key *) (hdr + 1);
777 key_info = WPA_GET_BE16(key->key_info);
778 key_data_length = WPA_GET_BE16(key->key_data_length);
779 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
780 " key_info=0x%x type=%u key_data_length=%u",
781 MAC2STR(sm->addr), key_info, key->type, key_data_length);
782 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
783 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
784 "key_data overflow (%d > %lu)",
785 key_data_length,
786 (unsigned long) (data_len - sizeof(*hdr) -
787 sizeof(*key)));
788 return;
789 }
790
791 if (sm->wpa == WPA_VERSION_WPA2) {
792 if (key->type == EAPOL_KEY_TYPE_WPA) {
793 /*
794 * Some deployed station implementations seem to send
795 * msg 4/4 with incorrect type value in WPA2 mode.
796 */
797 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
798 "with unexpected WPA type in RSN mode");
799 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
800 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
801 "unexpected type %d in RSN mode",
802 key->type);
803 return;
804 }
805 } else {
806 if (key->type != EAPOL_KEY_TYPE_WPA) {
807 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
808 "unexpected type %d in WPA mode",
809 key->type);
810 return;
811 }
812 }
813
814 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
815 WPA_NONCE_LEN);
816 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
817 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
818
819 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
820 * are set */
821
822 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
823 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
824 if (key_info & WPA_KEY_INFO_ERROR) {
825 msg = SMK_ERROR;
826 msgtxt = "SMK Error";
827 } else {
828 msg = SMK_M1;
829 msgtxt = "SMK M1";
830 }
831 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
832 msg = SMK_M3;
833 msgtxt = "SMK M3";
834 } else if (key_info & WPA_KEY_INFO_REQUEST) {
835 msg = REQUEST;
836 msgtxt = "Request";
837 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
838 msg = GROUP_2;
839 msgtxt = "2/2 Group";
840 } else if (key_data_length == 0) {
841 msg = PAIRWISE_4;
842 msgtxt = "4/4 Pairwise";
843 } else {
844 msg = PAIRWISE_2;
845 msgtxt = "2/4 Pairwise";
846 }
847
848 /* TODO: key_info type validation for PeerKey */
849 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
850 msg == GROUP_2) {
851 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
852 if (sm->pairwise == WPA_CIPHER_CCMP) {
853 if (wpa_use_aes_cmac(sm) &&
854 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
855 wpa_auth_logger(wpa_auth, sm->addr,
856 LOGGER_WARNING,
857 "advertised support for "
858 "AES-128-CMAC, but did not "
859 "use it");
860 return;
861 }
862
863 if (!wpa_use_aes_cmac(sm) &&
864 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
865 wpa_auth_logger(wpa_auth, sm->addr,
866 LOGGER_WARNING,
867 "did not use HMAC-SHA1-AES "
868 "with CCMP");
869 return;
870 }
871 }
872 }
873
874 if (key_info & WPA_KEY_INFO_REQUEST) {
875 if (sm->req_replay_counter_used &&
876 os_memcmp(key->replay_counter, sm->req_replay_counter,
877 WPA_REPLAY_COUNTER_LEN) <= 0) {
878 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
879 "received EAPOL-Key request with "
880 "replayed counter");
881 return;
882 }
883 }
884
885 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
886 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
887 int i;
888
889 if (msg == PAIRWISE_2 &&
890 wpa_replay_counter_valid(sm->prev_key_replay,
891 key->replay_counter) &&
892 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
893 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
894 {
895 /*
896 * Some supplicant implementations (e.g., Windows XP
897 * WZC) update SNonce for each EAPOL-Key 2/4. This
898 * breaks the workaround on accepting any of the
899 * pending requests, so allow the SNonce to be updated
900 * even if we have already sent out EAPOL-Key 3/4.
901 */
902 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
903 "Process SNonce update from STA "
904 "based on retransmitted EAPOL-Key "
905 "1/4");
906 sm->update_snonce = 1;
907 wpa_replay_counter_mark_invalid(sm->prev_key_replay,
908 key->replay_counter);
909 goto continue_processing;
910 }
911
912 if (msg == PAIRWISE_2 &&
913 wpa_replay_counter_valid(sm->prev_key_replay,
914 key->replay_counter) &&
915 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
916 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
917 "ignore retransmitted EAPOL-Key %s - "
918 "SNonce did not change", msgtxt);
919 } else {
920 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
921 "received EAPOL-Key %s with "
922 "unexpected replay counter", msgtxt);
923 }
924 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
925 if (!sm->key_replay[i].valid)
926 break;
927 wpa_hexdump(MSG_DEBUG, "pending replay counter",
928 sm->key_replay[i].counter,
929 WPA_REPLAY_COUNTER_LEN);
930 }
931 wpa_hexdump(MSG_DEBUG, "received replay counter",
932 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
933 return;
934 }
935
936 continue_processing:
937 switch (msg) {
938 case PAIRWISE_2:
939 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
940 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
941 (!sm->update_snonce ||
942 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
943 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
944 "received EAPOL-Key msg 2/4 in "
945 "invalid state (%d) - dropped",
946 sm->wpa_ptk_state);
947 return;
948 }
949 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
950 if (sm->group->reject_4way_hs_for_entropy) {
951 /*
952 * The system did not have enough entropy to generate
953 * strong random numbers. Reject the first 4-way
954 * handshake(s) and collect some entropy based on the
955 * information from it. Once enough entropy is
956 * available, the next atempt will trigger GMK/Key
957 * Counter update and the station will be allowed to
958 * continue.
959 */
960 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
961 "collect more entropy for random number "
962 "generation");
963 random_mark_pool_ready();
964 wpa_sta_disconnect(wpa_auth, sm->addr);
965 return;
966 }
967 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
968 &kde) < 0) {
969 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
970 "received EAPOL-Key msg 2/4 with "
971 "invalid Key Data contents");
972 return;
973 }
974 if (kde.rsn_ie) {
975 eapol_key_ie = kde.rsn_ie;
976 eapol_key_ie_len = kde.rsn_ie_len;
977 } else {
978 eapol_key_ie = kde.wpa_ie;
979 eapol_key_ie_len = kde.wpa_ie_len;
980 }
981 ft = sm->wpa == WPA_VERSION_WPA2 &&
982 wpa_key_mgmt_ft(sm->wpa_key_mgmt);
983 if (sm->wpa_ie == NULL ||
984 wpa_compare_rsn_ie(ft,
985 sm->wpa_ie, sm->wpa_ie_len,
986 eapol_key_ie, eapol_key_ie_len)) {
987 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
988 "WPA IE from (Re)AssocReq did not "
989 "match with msg 2/4");
990 if (sm->wpa_ie) {
991 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
992 sm->wpa_ie, sm->wpa_ie_len);
993 }
994 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
995 eapol_key_ie, eapol_key_ie_len);
996 /* MLME-DEAUTHENTICATE.request */
997 wpa_sta_disconnect(wpa_auth, sm->addr);
998 return;
999 }
1000 #ifdef CONFIG_IEEE80211R
1001 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
1002 wpa_sta_disconnect(wpa_auth, sm->addr);
1003 return;
1004 }
1005 #endif /* CONFIG_IEEE80211R */
1006 break;
1007 case PAIRWISE_4:
1008 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1009 !sm->PTK_valid) {
1010 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1011 "received EAPOL-Key msg 4/4 in "
1012 "invalid state (%d) - dropped",
1013 sm->wpa_ptk_state);
1014 return;
1015 }
1016 break;
1017 case GROUP_2:
1018 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1019 || !sm->PTK_valid) {
1020 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1021 "received EAPOL-Key msg 2/2 in "
1022 "invalid state (%d) - dropped",
1023 sm->wpa_ptk_group_state);
1024 return;
1025 }
1026 break;
1027 #ifdef CONFIG_PEERKEY
1028 case SMK_M1:
1029 case SMK_M3:
1030 case SMK_ERROR:
1031 if (!wpa_auth->conf.peerkey) {
1032 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1033 "PeerKey use disabled - ignoring message");
1034 return;
1035 }
1036 if (!sm->PTK_valid) {
1037 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1038 "received EAPOL-Key msg SMK in "
1039 "invalid state - dropped");
1040 return;
1041 }
1042 break;
1043 #else /* CONFIG_PEERKEY */
1044 case SMK_M1:
1045 case SMK_M3:
1046 case SMK_ERROR:
1047 return; /* STSL disabled - ignore SMK messages */
1048 #endif /* CONFIG_PEERKEY */
1049 case REQUEST:
1050 break;
1051 }
1052
1053 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1054 "received EAPOL-Key frame (%s)", msgtxt);
1055
1056 if (key_info & WPA_KEY_INFO_ACK) {
1057 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1058 "received invalid EAPOL-Key: Key Ack set");
1059 return;
1060 }
1061
1062 if (!(key_info & WPA_KEY_INFO_MIC)) {
1063 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1064 "received invalid EAPOL-Key: Key MIC not set");
1065 return;
1066 }
1067
1068 sm->MICVerified = FALSE;
1069 if (sm->PTK_valid && !sm->update_snonce) {
1070 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1071 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1072 "received EAPOL-Key with invalid MIC");
1073 return;
1074 }
1075 sm->MICVerified = TRUE;
1076 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1077 sm->pending_1_of_4_timeout = 0;
1078 }
1079
1080 if (key_info & WPA_KEY_INFO_REQUEST) {
1081 if (sm->MICVerified) {
1082 sm->req_replay_counter_used = 1;
1083 os_memcpy(sm->req_replay_counter, key->replay_counter,
1084 WPA_REPLAY_COUNTER_LEN);
1085 } else {
1086 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1087 "received EAPOL-Key request with "
1088 "invalid MIC");
1089 return;
1090 }
1091
1092 /*
1093 * TODO: should decrypt key data field if encryption was used;
1094 * even though MAC address KDE is not normally encrypted,
1095 * supplicant is allowed to encrypt it.
1096 */
1097 if (msg == SMK_ERROR) {
1098 #ifdef CONFIG_PEERKEY
1099 wpa_smk_error(wpa_auth, sm, key);
1100 #endif /* CONFIG_PEERKEY */
1101 return;
1102 } else if (key_info & WPA_KEY_INFO_ERROR) {
1103 wpa_receive_error_report(
1104 wpa_auth, sm,
1105 !(key_info & WPA_KEY_INFO_KEY_TYPE));
1106 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1107 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1108 "received EAPOL-Key Request for new "
1109 "4-Way Handshake");
1110 wpa_request_new_ptk(sm);
1111 #ifdef CONFIG_PEERKEY
1112 } else if (msg == SMK_M1) {
1113 wpa_smk_m1(wpa_auth, sm, key);
1114 #endif /* CONFIG_PEERKEY */
1115 } else if (key_data_length > 0 &&
1116 wpa_parse_kde_ies((const u8 *) (key + 1),
1117 key_data_length, &kde) == 0 &&
1118 kde.mac_addr) {
1119 } else {
1120 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1121 "received EAPOL-Key Request for GTK "
1122 "rekeying");
1123 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1124 wpa_rekey_gtk(wpa_auth, NULL);
1125 }
1126 } else {
1127 /* Do not allow the same key replay counter to be reused. */
1128 wpa_replay_counter_mark_invalid(sm->key_replay,
1129 key->replay_counter);
1130
1131 if (msg == PAIRWISE_2) {
1132 /*
1133 * Maintain a copy of the pending EAPOL-Key frames in
1134 * case the EAPOL-Key frame was retransmitted. This is
1135 * needed to allow EAPOL-Key msg 2/4 reply to another
1136 * pending msg 1/4 to update the SNonce to work around
1137 * unexpected supplicant behavior.
1138 */
1139 os_memcpy(sm->prev_key_replay, sm->key_replay,
1140 sizeof(sm->key_replay));
1141 } else {
1142 os_memset(sm->prev_key_replay, 0,
1143 sizeof(sm->prev_key_replay));
1144 }
1145
1146 /*
1147 * Make sure old valid counters are not accepted anymore and
1148 * do not get copied again.
1149 */
1150 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1151 }
1152
1153 #ifdef CONFIG_PEERKEY
1154 if (msg == SMK_M3) {
1155 wpa_smk_m3(wpa_auth, sm, key);
1156 return;
1157 }
1158 #endif /* CONFIG_PEERKEY */
1159
1160 os_free(sm->last_rx_eapol_key);
1161 sm->last_rx_eapol_key = os_malloc(data_len);
1162 if (sm->last_rx_eapol_key == NULL)
1163 return;
1164 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1165 sm->last_rx_eapol_key_len = data_len;
1166
1167 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1168 sm->EAPOLKeyReceived = TRUE;
1169 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1170 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1171 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1172 wpa_sm_step(sm);
1173 }
1174
1175
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1176 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1177 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1178 {
1179 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1180 u8 *pos;
1181 int ret = 0;
1182
1183 /* GTK = PRF-X(GMK, "Group key expansion",
1184 * AA || GNonce || Time || random data)
1185 * The example described in the IEEE 802.11 standard uses only AA and
1186 * GNonce as inputs here. Add some more entropy since this derivation
1187 * is done only at the Authenticator and as such, does not need to be
1188 * exactly same.
1189 */
1190 os_memcpy(data, addr, ETH_ALEN);
1191 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1192 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1193 wpa_get_ntp_timestamp(pos);
1194 pos += 8;
1195 if (random_get_bytes(pos, 16) < 0)
1196 ret = -1;
1197
1198 #ifdef CONFIG_IEEE80211W
1199 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1200 #else /* CONFIG_IEEE80211W */
1201 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1202 < 0)
1203 ret = -1;
1204 #endif /* CONFIG_IEEE80211W */
1205
1206 return ret;
1207 }
1208
1209
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1210 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1211 {
1212 struct wpa_authenticator *wpa_auth = eloop_ctx;
1213 struct wpa_state_machine *sm = timeout_ctx;
1214
1215 sm->pending_1_of_4_timeout = 0;
1216 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1217 sm->TimeoutEvt = TRUE;
1218 wpa_sm_step(sm);
1219 }
1220
1221
__wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr,int force_version)1222 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1223 struct wpa_state_machine *sm, int key_info,
1224 const u8 *key_rsc, const u8 *nonce,
1225 const u8 *kde, size_t kde_len,
1226 int keyidx, int encr, int force_version)
1227 {
1228 struct ieee802_1x_hdr *hdr;
1229 struct wpa_eapol_key *key;
1230 size_t len;
1231 int alg;
1232 int key_data_len, pad_len = 0;
1233 u8 *buf, *pos;
1234 int version, pairwise;
1235 int i;
1236
1237 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1238
1239 if (force_version)
1240 version = force_version;
1241 else if (wpa_use_aes_cmac(sm))
1242 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1243 else if (sm->pairwise == WPA_CIPHER_CCMP)
1244 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1245 else
1246 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1247
1248 pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1249
1250 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1251 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1252 "encr=%d)",
1253 version,
1254 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1255 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1256 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1257 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1258 pairwise, (unsigned long) kde_len, keyidx, encr);
1259
1260 key_data_len = kde_len;
1261
1262 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1263 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1264 pad_len = key_data_len % 8;
1265 if (pad_len)
1266 pad_len = 8 - pad_len;
1267 key_data_len += pad_len + 8;
1268 }
1269
1270 len += key_data_len;
1271
1272 hdr = os_zalloc(len);
1273 if (hdr == NULL)
1274 return;
1275 hdr->version = wpa_auth->conf.eapol_version;
1276 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1277 hdr->length = host_to_be16(len - sizeof(*hdr));
1278 key = (struct wpa_eapol_key *) (hdr + 1);
1279
1280 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1281 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1282 key_info |= version;
1283 if (encr && sm->wpa == WPA_VERSION_WPA2)
1284 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1285 if (sm->wpa != WPA_VERSION_WPA2)
1286 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1287 WPA_PUT_BE16(key->key_info, key_info);
1288
1289 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1290 switch (alg) {
1291 case WPA_CIPHER_CCMP:
1292 WPA_PUT_BE16(key->key_length, 16);
1293 break;
1294 case WPA_CIPHER_TKIP:
1295 WPA_PUT_BE16(key->key_length, 32);
1296 break;
1297 case WPA_CIPHER_WEP40:
1298 WPA_PUT_BE16(key->key_length, 5);
1299 break;
1300 case WPA_CIPHER_WEP104:
1301 WPA_PUT_BE16(key->key_length, 13);
1302 break;
1303 }
1304 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1305 WPA_PUT_BE16(key->key_length, 0);
1306
1307 /* FIX: STSL: what to use as key_replay_counter? */
1308 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1309 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1310 os_memcpy(sm->key_replay[i].counter,
1311 sm->key_replay[i - 1].counter,
1312 WPA_REPLAY_COUNTER_LEN);
1313 }
1314 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1315 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1316 WPA_REPLAY_COUNTER_LEN);
1317 sm->key_replay[0].valid = TRUE;
1318
1319 if (nonce)
1320 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1321
1322 if (key_rsc)
1323 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1324
1325 if (kde && !encr) {
1326 os_memcpy(key + 1, kde, kde_len);
1327 WPA_PUT_BE16(key->key_data_length, kde_len);
1328 } else if (encr && kde) {
1329 buf = os_zalloc(key_data_len);
1330 if (buf == NULL) {
1331 os_free(hdr);
1332 return;
1333 }
1334 pos = buf;
1335 os_memcpy(pos, kde, kde_len);
1336 pos += kde_len;
1337
1338 if (pad_len)
1339 *pos++ = 0xdd;
1340
1341 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1342 buf, key_data_len);
1343 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1344 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1345 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1346 (u8 *) (key + 1))) {
1347 os_free(hdr);
1348 os_free(buf);
1349 return;
1350 }
1351 WPA_PUT_BE16(key->key_data_length, key_data_len);
1352 } else {
1353 u8 ek[32];
1354 os_memcpy(key->key_iv,
1355 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1356 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1357 os_memcpy(ek, key->key_iv, 16);
1358 os_memcpy(ek + 16, sm->PTK.kek, 16);
1359 os_memcpy(key + 1, buf, key_data_len);
1360 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1361 WPA_PUT_BE16(key->key_data_length, key_data_len);
1362 }
1363 os_free(buf);
1364 }
1365
1366 if (key_info & WPA_KEY_INFO_MIC) {
1367 if (!sm->PTK_valid) {
1368 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1369 "PTK not valid when sending EAPOL-Key "
1370 "frame");
1371 os_free(hdr);
1372 return;
1373 }
1374 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1375 key->key_mic);
1376 }
1377
1378 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1379 1);
1380 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1381 sm->pairwise_set);
1382 os_free(hdr);
1383 }
1384
1385
wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr)1386 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1387 struct wpa_state_machine *sm, int key_info,
1388 const u8 *key_rsc, const u8 *nonce,
1389 const u8 *kde, size_t kde_len,
1390 int keyidx, int encr)
1391 {
1392 int timeout_ms;
1393 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1394 int ctr;
1395
1396 if (sm == NULL)
1397 return;
1398
1399 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1400 keyidx, encr, 0);
1401
1402 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1403 if (ctr == 1 && wpa_auth->conf.tx_status)
1404 timeout_ms = pairwise ? eapol_key_timeout_first :
1405 eapol_key_timeout_first_group;
1406 else
1407 timeout_ms = eapol_key_timeout_subseq;
1408 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1409 sm->pending_1_of_4_timeout = 1;
1410 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1411 "counter %d)", timeout_ms, ctr);
1412 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1413 wpa_send_eapol_timeout, wpa_auth, sm);
1414 }
1415
1416
wpa_verify_key_mic(struct wpa_ptk * PTK,u8 * data,size_t data_len)1417 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1418 {
1419 struct ieee802_1x_hdr *hdr;
1420 struct wpa_eapol_key *key;
1421 u16 key_info;
1422 int ret = 0;
1423 u8 mic[16];
1424
1425 if (data_len < sizeof(*hdr) + sizeof(*key))
1426 return -1;
1427
1428 hdr = (struct ieee802_1x_hdr *) data;
1429 key = (struct wpa_eapol_key *) (hdr + 1);
1430 key_info = WPA_GET_BE16(key->key_info);
1431 os_memcpy(mic, key->key_mic, 16);
1432 os_memset(key->key_mic, 0, 16);
1433 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1434 data, data_len, key->key_mic) ||
1435 os_memcmp(mic, key->key_mic, 16) != 0)
1436 ret = -1;
1437 os_memcpy(key->key_mic, mic, 16);
1438 return ret;
1439 }
1440
1441
wpa_remove_ptk(struct wpa_state_machine * sm)1442 void wpa_remove_ptk(struct wpa_state_machine *sm)
1443 {
1444 sm->PTK_valid = FALSE;
1445 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1446 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1447 sm->pairwise_set = FALSE;
1448 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1449 }
1450
1451
wpa_auth_sm_event(struct wpa_state_machine * sm,wpa_event event)1452 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1453 {
1454 int remove_ptk = 1;
1455
1456 if (sm == NULL)
1457 return -1;
1458
1459 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1460 "event %d notification", event);
1461
1462 switch (event) {
1463 case WPA_AUTH:
1464 case WPA_ASSOC:
1465 break;
1466 case WPA_DEAUTH:
1467 case WPA_DISASSOC:
1468 sm->DeauthenticationRequest = TRUE;
1469 break;
1470 case WPA_REAUTH:
1471 case WPA_REAUTH_EAPOL:
1472 if (!sm->started) {
1473 /*
1474 * When using WPS, we may end up here if the STA
1475 * manages to re-associate without the previous STA
1476 * entry getting removed. Consequently, we need to make
1477 * sure that the WPA state machines gets initialized
1478 * properly at this point.
1479 */
1480 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1481 "started - initialize now");
1482 sm->started = 1;
1483 sm->Init = TRUE;
1484 if (wpa_sm_step(sm) == 1)
1485 return 1; /* should not really happen */
1486 sm->Init = FALSE;
1487 sm->AuthenticationRequest = TRUE;
1488 break;
1489 }
1490 if (sm->GUpdateStationKeys) {
1491 /*
1492 * Reauthentication cancels the pending group key
1493 * update for this STA.
1494 */
1495 sm->group->GKeyDoneStations--;
1496 sm->GUpdateStationKeys = FALSE;
1497 sm->PtkGroupInit = TRUE;
1498 }
1499 sm->ReAuthenticationRequest = TRUE;
1500 break;
1501 case WPA_ASSOC_FT:
1502 #ifdef CONFIG_IEEE80211R
1503 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1504 "after association");
1505 wpa_ft_install_ptk(sm);
1506
1507 /* Using FT protocol, not WPA auth state machine */
1508 sm->ft_completed = 1;
1509 return 0;
1510 #else /* CONFIG_IEEE80211R */
1511 break;
1512 #endif /* CONFIG_IEEE80211R */
1513 }
1514
1515 #ifdef CONFIG_IEEE80211R
1516 sm->ft_completed = 0;
1517 #endif /* CONFIG_IEEE80211R */
1518
1519 #ifdef CONFIG_IEEE80211W
1520 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1521 remove_ptk = 0;
1522 #endif /* CONFIG_IEEE80211W */
1523
1524 if (remove_ptk) {
1525 sm->PTK_valid = FALSE;
1526 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1527
1528 if (event != WPA_REAUTH_EAPOL)
1529 wpa_remove_ptk(sm);
1530 }
1531
1532 return wpa_sm_step(sm);
1533 }
1534
1535
wpa_alg_enum(int alg)1536 static enum wpa_alg wpa_alg_enum(int alg)
1537 {
1538 switch (alg) {
1539 case WPA_CIPHER_CCMP:
1540 return WPA_ALG_CCMP;
1541 case WPA_CIPHER_TKIP:
1542 return WPA_ALG_TKIP;
1543 case WPA_CIPHER_WEP104:
1544 case WPA_CIPHER_WEP40:
1545 return WPA_ALG_WEP;
1546 default:
1547 return WPA_ALG_NONE;
1548 }
1549 }
1550
1551
SM_STATE(WPA_PTK,INITIALIZE)1552 SM_STATE(WPA_PTK, INITIALIZE)
1553 {
1554 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1555 if (sm->Init) {
1556 /* Init flag is not cleared here, so avoid busy
1557 * loop by claiming nothing changed. */
1558 sm->changed = FALSE;
1559 }
1560
1561 sm->keycount = 0;
1562 if (sm->GUpdateStationKeys)
1563 sm->group->GKeyDoneStations--;
1564 sm->GUpdateStationKeys = FALSE;
1565 if (sm->wpa == WPA_VERSION_WPA)
1566 sm->PInitAKeys = FALSE;
1567 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1568 * Local AA > Remote AA)) */) {
1569 sm->Pair = TRUE;
1570 }
1571 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1572 wpa_remove_ptk(sm);
1573 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1574 sm->TimeoutCtr = 0;
1575 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1576 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1577 WPA_EAPOL_authorized, 0);
1578 }
1579 }
1580
1581
SM_STATE(WPA_PTK,DISCONNECT)1582 SM_STATE(WPA_PTK, DISCONNECT)
1583 {
1584 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1585 sm->Disconnect = FALSE;
1586 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1587 }
1588
1589
SM_STATE(WPA_PTK,DISCONNECTED)1590 SM_STATE(WPA_PTK, DISCONNECTED)
1591 {
1592 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1593 sm->DeauthenticationRequest = FALSE;
1594 }
1595
1596
SM_STATE(WPA_PTK,AUTHENTICATION)1597 SM_STATE(WPA_PTK, AUTHENTICATION)
1598 {
1599 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1600 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1601 sm->PTK_valid = FALSE;
1602 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1603 1);
1604 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1605 sm->AuthenticationRequest = FALSE;
1606 }
1607
1608
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1609 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1610 struct wpa_group *group)
1611 {
1612 if (group->first_sta_seen)
1613 return;
1614 /*
1615 * System has run bit further than at the time hostapd was started
1616 * potentially very early during boot up. This provides better chances
1617 * of collecting more randomness on embedded systems. Re-initialize the
1618 * GMK and Counter here to improve their strength if there was not
1619 * enough entropy available immediately after system startup.
1620 */
1621 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1622 "station");
1623 if (random_pool_ready() != 1) {
1624 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1625 "to proceed - reject first 4-way handshake");
1626 group->reject_4way_hs_for_entropy = TRUE;
1627 } else {
1628 group->first_sta_seen = TRUE;
1629 group->reject_4way_hs_for_entropy = FALSE;
1630 }
1631
1632 wpa_group_init_gmk_and_counter(wpa_auth, group);
1633 wpa_gtk_update(wpa_auth, group);
1634 wpa_group_config_group_keys(wpa_auth, group);
1635 }
1636
1637
SM_STATE(WPA_PTK,AUTHENTICATION2)1638 SM_STATE(WPA_PTK, AUTHENTICATION2)
1639 {
1640 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1641
1642 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1643
1644 os_memcpy(sm->ANonce, sm->group->Counter, WPA_NONCE_LEN);
1645 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1646 WPA_NONCE_LEN);
1647 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1648 sm->ReAuthenticationRequest = FALSE;
1649 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1650 * logical place than INITIALIZE since AUTHENTICATION2 can be
1651 * re-entered on ReAuthenticationRequest without going through
1652 * INITIALIZE. */
1653 sm->TimeoutCtr = 0;
1654 }
1655
1656
SM_STATE(WPA_PTK,INITPMK)1657 SM_STATE(WPA_PTK, INITPMK)
1658 {
1659 u8 msk[2 * PMK_LEN];
1660 size_t len = 2 * PMK_LEN;
1661
1662 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1663 #ifdef CONFIG_IEEE80211R
1664 sm->xxkey_len = 0;
1665 #endif /* CONFIG_IEEE80211R */
1666 if (sm->pmksa) {
1667 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1668 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1669 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1670 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1671 "(len=%lu)", (unsigned long) len);
1672 os_memcpy(sm->PMK, msk, PMK_LEN);
1673 #ifdef CONFIG_IEEE80211R
1674 if (len >= 2 * PMK_LEN) {
1675 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1676 sm->xxkey_len = PMK_LEN;
1677 }
1678 #endif /* CONFIG_IEEE80211R */
1679 } else {
1680 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1681 }
1682
1683 sm->req_replay_counter_used = 0;
1684 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1685 * will break reauthentication since EAPOL state machines may not be
1686 * get into AUTHENTICATING state that clears keyRun before WPA state
1687 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1688 * state and takes PMK from the previously used AAA Key. This will
1689 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1690 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1691 * be good workaround for this issue. */
1692 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1693 }
1694
1695
SM_STATE(WPA_PTK,INITPSK)1696 SM_STATE(WPA_PTK, INITPSK)
1697 {
1698 const u8 *psk;
1699 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1700 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL);
1701 if (psk) {
1702 os_memcpy(sm->PMK, psk, PMK_LEN);
1703 #ifdef CONFIG_IEEE80211R
1704 os_memcpy(sm->xxkey, psk, PMK_LEN);
1705 sm->xxkey_len = PMK_LEN;
1706 #endif /* CONFIG_IEEE80211R */
1707 }
1708 sm->req_replay_counter_used = 0;
1709 }
1710
1711
SM_STATE(WPA_PTK,PTKSTART)1712 SM_STATE(WPA_PTK, PTKSTART)
1713 {
1714 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1715 size_t pmkid_len = 0;
1716
1717 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1718 sm->PTKRequest = FALSE;
1719 sm->TimeoutEvt = FALSE;
1720
1721 sm->TimeoutCtr++;
1722 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1723 /* No point in sending the EAPOL-Key - we will disconnect
1724 * immediately following this. */
1725 return;
1726 }
1727
1728 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1729 "sending 1/4 msg of 4-Way Handshake");
1730 /*
1731 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1732 * one possible PSK for this STA.
1733 */
1734 if (sm->wpa == WPA_VERSION_WPA2 &&
1735 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1736 pmkid = buf;
1737 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1738 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1739 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1740 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1741 if (sm->pmksa)
1742 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1743 sm->pmksa->pmkid, PMKID_LEN);
1744 else {
1745 /*
1746 * Calculate PMKID since no PMKSA cache entry was
1747 * available with pre-calculated PMKID.
1748 */
1749 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1750 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1751 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1752 }
1753 }
1754 wpa_send_eapol(sm->wpa_auth, sm,
1755 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1756 sm->ANonce, pmkid, pmkid_len, 0, 0);
1757 }
1758
1759
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk)1760 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1761 struct wpa_ptk *ptk)
1762 {
1763 size_t ptk_len = sm->pairwise == WPA_CIPHER_CCMP ? 48 : 64;
1764 #ifdef CONFIG_IEEE80211R
1765 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1766 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1767 #endif /* CONFIG_IEEE80211R */
1768
1769 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1770 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1771 (u8 *) ptk, ptk_len,
1772 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1773
1774 return 0;
1775 }
1776
1777
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)1778 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1779 {
1780 struct wpa_ptk PTK;
1781 int ok = 0;
1782 const u8 *pmk = NULL;
1783
1784 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1785 sm->EAPOLKeyReceived = FALSE;
1786 sm->update_snonce = FALSE;
1787
1788 /* WPA with IEEE 802.1X: use the derived PMK from EAP
1789 * WPA-PSK: iterate through possible PSKs and select the one matching
1790 * the packet */
1791 for (;;) {
1792 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1793 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk);
1794 if (pmk == NULL)
1795 break;
1796 } else
1797 pmk = sm->PMK;
1798
1799 wpa_derive_ptk(sm, pmk, &PTK);
1800
1801 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1802 sm->last_rx_eapol_key_len) == 0) {
1803 ok = 1;
1804 break;
1805 }
1806
1807 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1808 break;
1809 }
1810
1811 if (!ok) {
1812 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1813 "invalid MIC in msg 2/4 of 4-Way Handshake");
1814 return;
1815 }
1816
1817 #ifdef CONFIG_IEEE80211R
1818 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1819 /*
1820 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1821 * with the value we derived.
1822 */
1823 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1824 WPA_PMK_NAME_LEN) != 0) {
1825 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1826 "PMKR1Name mismatch in FT 4-way "
1827 "handshake");
1828 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1829 "Supplicant",
1830 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1831 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1832 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1833 return;
1834 }
1835 }
1836 #endif /* CONFIG_IEEE80211R */
1837
1838 sm->pending_1_of_4_timeout = 0;
1839 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1840
1841 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1842 /* PSK may have changed from the previous choice, so update
1843 * state machine data based on whatever PSK was selected here.
1844 */
1845 os_memcpy(sm->PMK, pmk, PMK_LEN);
1846 }
1847
1848 sm->MICVerified = TRUE;
1849
1850 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1851 sm->PTK_valid = TRUE;
1852 }
1853
1854
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)1855 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1856 {
1857 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1858 sm->TimeoutCtr = 0;
1859 }
1860
1861
1862 #ifdef CONFIG_IEEE80211W
1863
ieee80211w_kde_len(struct wpa_state_machine * sm)1864 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1865 {
1866 if (sm->mgmt_frame_prot) {
1867 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1868 }
1869
1870 return 0;
1871 }
1872
1873
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1874 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1875 {
1876 struct wpa_igtk_kde igtk;
1877 struct wpa_group *gsm = sm->group;
1878
1879 if (!sm->mgmt_frame_prot)
1880 return pos;
1881
1882 igtk.keyid[0] = gsm->GN_igtk;
1883 igtk.keyid[1] = 0;
1884 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1885 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0)
1886 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1887 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1888 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1889 (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1890
1891 return pos;
1892 }
1893
1894 #else /* CONFIG_IEEE80211W */
1895
ieee80211w_kde_len(struct wpa_state_machine * sm)1896 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1897 {
1898 return 0;
1899 }
1900
1901
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1902 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1903 {
1904 return pos;
1905 }
1906
1907 #endif /* CONFIG_IEEE80211W */
1908
1909
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)1910 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1911 {
1912 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos;
1913 size_t gtk_len, kde_len;
1914 struct wpa_group *gsm = sm->group;
1915 u8 *wpa_ie;
1916 int wpa_ie_len, secure, keyidx, encr = 0;
1917
1918 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1919 sm->TimeoutEvt = FALSE;
1920
1921 sm->TimeoutCtr++;
1922 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1923 /* No point in sending the EAPOL-Key - we will disconnect
1924 * immediately following this. */
1925 return;
1926 }
1927
1928 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1929 GTK[GN], IGTK, [FTIE], [TIE * 2])
1930 */
1931 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1932 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1933 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1934 wpa_ie = sm->wpa_auth->wpa_ie;
1935 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1936 if (sm->wpa == WPA_VERSION_WPA &&
1937 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1938 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1939 /* WPA-only STA, remove RSN IE */
1940 wpa_ie = wpa_ie + wpa_ie[1] + 2;
1941 wpa_ie_len = wpa_ie[1] + 2;
1942 }
1943 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1944 "sending 3/4 msg of 4-Way Handshake");
1945 if (sm->wpa == WPA_VERSION_WPA2) {
1946 /* WPA2 send GTK in the 4-way handshake */
1947 secure = 1;
1948 gtk = gsm->GTK[gsm->GN - 1];
1949 gtk_len = gsm->GTK_len;
1950 keyidx = gsm->GN;
1951 _rsc = rsc;
1952 encr = 1;
1953 } else {
1954 /* WPA does not include GTK in msg 3/4 */
1955 secure = 0;
1956 gtk = NULL;
1957 gtk_len = 0;
1958 keyidx = 0;
1959 _rsc = NULL;
1960 if (sm->rx_eapol_key_secure) {
1961 /*
1962 * It looks like Windows 7 supplicant tries to use
1963 * Secure bit in msg 2/4 after having reported Michael
1964 * MIC failure and it then rejects the 4-way handshake
1965 * if msg 3/4 does not set Secure bit. Work around this
1966 * by setting the Secure bit here even in the case of
1967 * WPA if the supplicant used it first.
1968 */
1969 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1970 "STA used Secure bit in WPA msg 2/4 - "
1971 "set Secure for 3/4 as workaround");
1972 secure = 1;
1973 }
1974 }
1975
1976 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
1977 if (gtk)
1978 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
1979 #ifdef CONFIG_IEEE80211R
1980 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1981 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
1982 kde_len += 300; /* FTIE + 2 * TIE */
1983 }
1984 #endif /* CONFIG_IEEE80211R */
1985 kde = os_malloc(kde_len);
1986 if (kde == NULL)
1987 return;
1988
1989 pos = kde;
1990 os_memcpy(pos, wpa_ie, wpa_ie_len);
1991 pos += wpa_ie_len;
1992 #ifdef CONFIG_IEEE80211R
1993 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1994 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
1995 if (res < 0) {
1996 wpa_printf(MSG_ERROR, "FT: Failed to insert "
1997 "PMKR1Name into RSN IE in EAPOL-Key data");
1998 os_free(kde);
1999 return;
2000 }
2001 pos += res;
2002 }
2003 #endif /* CONFIG_IEEE80211R */
2004 if (gtk) {
2005 u8 hdr[2];
2006 hdr[0] = keyidx & 0x03;
2007 hdr[1] = 0;
2008 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2009 gtk, gtk_len);
2010 }
2011 pos = ieee80211w_kde_add(sm, pos);
2012
2013 #ifdef CONFIG_IEEE80211R
2014 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2015 int res;
2016 struct wpa_auth_config *conf;
2017
2018 conf = &sm->wpa_auth->conf;
2019 res = wpa_write_ftie(conf, conf->r0_key_holder,
2020 conf->r0_key_holder_len,
2021 NULL, NULL, pos, kde + kde_len - pos,
2022 NULL, 0);
2023 if (res < 0) {
2024 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2025 "into EAPOL-Key Key Data");
2026 os_free(kde);
2027 return;
2028 }
2029 pos += res;
2030
2031 /* TIE[ReassociationDeadline] (TU) */
2032 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2033 *pos++ = 5;
2034 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2035 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2036 pos += 4;
2037
2038 /* TIE[KeyLifetime] (seconds) */
2039 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2040 *pos++ = 5;
2041 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2042 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2043 pos += 4;
2044 }
2045 #endif /* CONFIG_IEEE80211R */
2046
2047 wpa_send_eapol(sm->wpa_auth, sm,
2048 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2049 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2050 WPA_KEY_INFO_KEY_TYPE,
2051 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2052 os_free(kde);
2053 }
2054
2055
SM_STATE(WPA_PTK,PTKINITDONE)2056 SM_STATE(WPA_PTK, PTKINITDONE)
2057 {
2058 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2059 sm->EAPOLKeyReceived = FALSE;
2060 if (sm->Pair) {
2061 enum wpa_alg alg;
2062 int klen;
2063 if (sm->pairwise == WPA_CIPHER_TKIP) {
2064 alg = WPA_ALG_TKIP;
2065 klen = 32;
2066 } else {
2067 alg = WPA_ALG_CCMP;
2068 klen = 16;
2069 }
2070 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2071 sm->PTK.tk1, klen)) {
2072 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2073 return;
2074 }
2075 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2076 sm->pairwise_set = TRUE;
2077
2078 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2079 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2080 eloop_register_timeout(sm->wpa_auth->conf.
2081 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2082 sm->wpa_auth, sm);
2083 }
2084
2085 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2086 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2087 WPA_EAPOL_authorized, 1);
2088 }
2089 }
2090
2091 if (0 /* IBSS == TRUE */) {
2092 sm->keycount++;
2093 if (sm->keycount == 2) {
2094 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2095 WPA_EAPOL_portValid, 1);
2096 }
2097 } else {
2098 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2099 1);
2100 }
2101 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2102 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2103 if (sm->wpa == WPA_VERSION_WPA)
2104 sm->PInitAKeys = TRUE;
2105 else
2106 sm->has_GTK = TRUE;
2107 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2108 "pairwise key handshake completed (%s)",
2109 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2110
2111 #ifdef CONFIG_IEEE80211R
2112 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2113 #endif /* CONFIG_IEEE80211R */
2114 }
2115
2116
SM_STEP(WPA_PTK)2117 SM_STEP(WPA_PTK)
2118 {
2119 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2120
2121 if (sm->Init)
2122 SM_ENTER(WPA_PTK, INITIALIZE);
2123 else if (sm->Disconnect
2124 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2125 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2126 "WPA_PTK: sm->Disconnect");
2127 SM_ENTER(WPA_PTK, DISCONNECT);
2128 }
2129 else if (sm->DeauthenticationRequest)
2130 SM_ENTER(WPA_PTK, DISCONNECTED);
2131 else if (sm->AuthenticationRequest)
2132 SM_ENTER(WPA_PTK, AUTHENTICATION);
2133 else if (sm->ReAuthenticationRequest)
2134 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2135 else if (sm->PTKRequest)
2136 SM_ENTER(WPA_PTK, PTKSTART);
2137 else switch (sm->wpa_ptk_state) {
2138 case WPA_PTK_INITIALIZE:
2139 break;
2140 case WPA_PTK_DISCONNECT:
2141 SM_ENTER(WPA_PTK, DISCONNECTED);
2142 break;
2143 case WPA_PTK_DISCONNECTED:
2144 SM_ENTER(WPA_PTK, INITIALIZE);
2145 break;
2146 case WPA_PTK_AUTHENTICATION:
2147 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2148 break;
2149 case WPA_PTK_AUTHENTICATION2:
2150 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2151 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2152 WPA_EAPOL_keyRun) > 0)
2153 SM_ENTER(WPA_PTK, INITPMK);
2154 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2155 /* FIX: && 802.1X::keyRun */)
2156 SM_ENTER(WPA_PTK, INITPSK);
2157 break;
2158 case WPA_PTK_INITPMK:
2159 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2160 WPA_EAPOL_keyAvailable) > 0)
2161 SM_ENTER(WPA_PTK, PTKSTART);
2162 else {
2163 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2164 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2165 "INITPMK - keyAvailable = false");
2166 SM_ENTER(WPA_PTK, DISCONNECT);
2167 }
2168 break;
2169 case WPA_PTK_INITPSK:
2170 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL))
2171 SM_ENTER(WPA_PTK, PTKSTART);
2172 else {
2173 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2174 "no PSK configured for the STA");
2175 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2176 SM_ENTER(WPA_PTK, DISCONNECT);
2177 }
2178 break;
2179 case WPA_PTK_PTKSTART:
2180 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2181 sm->EAPOLKeyPairwise)
2182 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2183 else if (sm->TimeoutCtr >
2184 (int) dot11RSNAConfigPairwiseUpdateCount) {
2185 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2186 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2187 "PTKSTART: Retry limit %d reached",
2188 dot11RSNAConfigPairwiseUpdateCount);
2189 SM_ENTER(WPA_PTK, DISCONNECT);
2190 } else if (sm->TimeoutEvt)
2191 SM_ENTER(WPA_PTK, PTKSTART);
2192 break;
2193 case WPA_PTK_PTKCALCNEGOTIATING:
2194 if (sm->MICVerified)
2195 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2196 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2197 sm->EAPOLKeyPairwise)
2198 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2199 else if (sm->TimeoutEvt)
2200 SM_ENTER(WPA_PTK, PTKSTART);
2201 break;
2202 case WPA_PTK_PTKCALCNEGOTIATING2:
2203 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2204 break;
2205 case WPA_PTK_PTKINITNEGOTIATING:
2206 if (sm->update_snonce)
2207 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2208 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2209 sm->EAPOLKeyPairwise && sm->MICVerified)
2210 SM_ENTER(WPA_PTK, PTKINITDONE);
2211 else if (sm->TimeoutCtr >
2212 (int) dot11RSNAConfigPairwiseUpdateCount) {
2213 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2214 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2215 "PTKINITNEGOTIATING: Retry limit %d "
2216 "reached",
2217 dot11RSNAConfigPairwiseUpdateCount);
2218 SM_ENTER(WPA_PTK, DISCONNECT);
2219 } else if (sm->TimeoutEvt)
2220 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2221 break;
2222 case WPA_PTK_PTKINITDONE:
2223 break;
2224 }
2225 }
2226
2227
SM_STATE(WPA_PTK_GROUP,IDLE)2228 SM_STATE(WPA_PTK_GROUP, IDLE)
2229 {
2230 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2231 if (sm->Init) {
2232 /* Init flag is not cleared here, so avoid busy
2233 * loop by claiming nothing changed. */
2234 sm->changed = FALSE;
2235 }
2236 sm->GTimeoutCtr = 0;
2237 }
2238
2239
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)2240 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2241 {
2242 u8 rsc[WPA_KEY_RSC_LEN];
2243 struct wpa_group *gsm = sm->group;
2244 u8 *kde, *pos, hdr[2];
2245 size_t kde_len;
2246
2247 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2248
2249 sm->GTimeoutCtr++;
2250 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2251 /* No point in sending the EAPOL-Key - we will disconnect
2252 * immediately following this. */
2253 return;
2254 }
2255
2256 if (sm->wpa == WPA_VERSION_WPA)
2257 sm->PInitAKeys = FALSE;
2258 sm->TimeoutEvt = FALSE;
2259 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2260 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2261 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2262 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2263 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2264 "sending 1/2 msg of Group Key Handshake");
2265
2266 if (sm->wpa == WPA_VERSION_WPA2) {
2267 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2268 ieee80211w_kde_len(sm);
2269 kde = os_malloc(kde_len);
2270 if (kde == NULL)
2271 return;
2272
2273 pos = kde;
2274 hdr[0] = gsm->GN & 0x03;
2275 hdr[1] = 0;
2276 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2277 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2278 pos = ieee80211w_kde_add(sm, pos);
2279 } else {
2280 kde = gsm->GTK[gsm->GN - 1];
2281 pos = kde + gsm->GTK_len;
2282 }
2283
2284 wpa_send_eapol(sm->wpa_auth, sm,
2285 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2286 WPA_KEY_INFO_ACK |
2287 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2288 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2289 if (sm->wpa == WPA_VERSION_WPA2)
2290 os_free(kde);
2291 }
2292
2293
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)2294 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2295 {
2296 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2297 sm->EAPOLKeyReceived = FALSE;
2298 if (sm->GUpdateStationKeys)
2299 sm->group->GKeyDoneStations--;
2300 sm->GUpdateStationKeys = FALSE;
2301 sm->GTimeoutCtr = 0;
2302 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2303 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2304 "group key handshake completed (%s)",
2305 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2306 sm->has_GTK = TRUE;
2307 }
2308
2309
SM_STATE(WPA_PTK_GROUP,KEYERROR)2310 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2311 {
2312 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2313 if (sm->GUpdateStationKeys)
2314 sm->group->GKeyDoneStations--;
2315 sm->GUpdateStationKeys = FALSE;
2316 sm->Disconnect = TRUE;
2317 }
2318
2319
SM_STEP(WPA_PTK_GROUP)2320 SM_STEP(WPA_PTK_GROUP)
2321 {
2322 if (sm->Init || sm->PtkGroupInit) {
2323 SM_ENTER(WPA_PTK_GROUP, IDLE);
2324 sm->PtkGroupInit = FALSE;
2325 } else switch (sm->wpa_ptk_group_state) {
2326 case WPA_PTK_GROUP_IDLE:
2327 if (sm->GUpdateStationKeys ||
2328 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2329 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2330 break;
2331 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2332 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2333 !sm->EAPOLKeyPairwise && sm->MICVerified)
2334 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2335 else if (sm->GTimeoutCtr >
2336 (int) dot11RSNAConfigGroupUpdateCount)
2337 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2338 else if (sm->TimeoutEvt)
2339 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2340 break;
2341 case WPA_PTK_GROUP_KEYERROR:
2342 SM_ENTER(WPA_PTK_GROUP, IDLE);
2343 break;
2344 case WPA_PTK_GROUP_REKEYESTABLISHED:
2345 SM_ENTER(WPA_PTK_GROUP, IDLE);
2346 break;
2347 }
2348 }
2349
2350
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2351 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2352 struct wpa_group *group)
2353 {
2354 int ret = 0;
2355
2356 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2357 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2358 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2359 wpa_auth->addr, group->GNonce,
2360 group->GTK[group->GN - 1], group->GTK_len) < 0)
2361 ret = -1;
2362 wpa_hexdump_key(MSG_DEBUG, "GTK",
2363 group->GTK[group->GN - 1], group->GTK_len);
2364
2365 #ifdef CONFIG_IEEE80211W
2366 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2367 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2368 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2369 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2370 wpa_auth->addr, group->GNonce,
2371 group->IGTK[group->GN_igtk - 4],
2372 WPA_IGTK_LEN) < 0)
2373 ret = -1;
2374 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2375 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2376 }
2377 #endif /* CONFIG_IEEE80211W */
2378
2379 return ret;
2380 }
2381
2382
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2383 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2384 struct wpa_group *group)
2385 {
2386 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2387 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2388 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2389 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2390
2391 /* GTK[0..N] = 0 */
2392 os_memset(group->GTK, 0, sizeof(group->GTK));
2393 group->GN = 1;
2394 group->GM = 2;
2395 #ifdef CONFIG_IEEE80211W
2396 group->GN_igtk = 4;
2397 group->GM_igtk = 5;
2398 #endif /* CONFIG_IEEE80211W */
2399 /* GTK[GN] = CalcGTK() */
2400 wpa_gtk_update(wpa_auth, group);
2401 }
2402
2403
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)2404 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2405 {
2406 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2407 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2408 "Not in PTKINITDONE; skip Group Key update");
2409 sm->GUpdateStationKeys = FALSE;
2410 return 0;
2411 }
2412 if (sm->GUpdateStationKeys) {
2413 /*
2414 * This should not really happen, so add a debug log entry.
2415 * Since we clear the GKeyDoneStations before the loop, the
2416 * station needs to be counted here anyway.
2417 */
2418 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2419 "GUpdateStationKeys was already set when "
2420 "marking station for GTK rekeying");
2421 }
2422
2423 sm->group->GKeyDoneStations++;
2424 sm->GUpdateStationKeys = TRUE;
2425
2426 wpa_sm_step(sm);
2427 return 0;
2428 }
2429
2430
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2431 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2432 struct wpa_group *group)
2433 {
2434 int tmp;
2435
2436 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2437 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2438 group->changed = TRUE;
2439 group->wpa_group_state = WPA_GROUP_SETKEYS;
2440 group->GTKReKey = FALSE;
2441 tmp = group->GM;
2442 group->GM = group->GN;
2443 group->GN = tmp;
2444 #ifdef CONFIG_IEEE80211W
2445 tmp = group->GM_igtk;
2446 group->GM_igtk = group->GN_igtk;
2447 group->GN_igtk = tmp;
2448 #endif /* CONFIG_IEEE80211W */
2449 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2450 * counting the STAs that are marked with GUpdateStationKeys instead of
2451 * including all STAs that could be in not-yet-completed state. */
2452 wpa_gtk_update(wpa_auth, group);
2453
2454 if (group->GKeyDoneStations) {
2455 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2456 "GKeyDoneStations=%d when starting new GTK rekey",
2457 group->GKeyDoneStations);
2458 group->GKeyDoneStations = 0;
2459 }
2460 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, NULL);
2461 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2462 group->GKeyDoneStations);
2463 }
2464
2465
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2466 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2467 struct wpa_group *group)
2468 {
2469 int ret = 0;
2470
2471 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2472 wpa_alg_enum(wpa_auth->conf.wpa_group),
2473 broadcast_ether_addr, group->GN,
2474 group->GTK[group->GN - 1], group->GTK_len) < 0)
2475 ret = -1;
2476
2477 #ifdef CONFIG_IEEE80211W
2478 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2479 wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2480 broadcast_ether_addr, group->GN_igtk,
2481 group->IGTK[group->GN_igtk - 4],
2482 WPA_IGTK_LEN) < 0)
2483 ret = -1;
2484 #endif /* CONFIG_IEEE80211W */
2485
2486 return ret;
2487 }
2488
2489
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2490 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2491 struct wpa_group *group)
2492 {
2493 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2494 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2495 group->changed = TRUE;
2496 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2497
2498 if (wpa_group_config_group_keys(wpa_auth, group) < 0)
2499 return -1;
2500
2501 return 0;
2502 }
2503
2504
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2505 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2506 struct wpa_group *group)
2507 {
2508 if (group->GInit) {
2509 wpa_group_gtk_init(wpa_auth, group);
2510 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2511 group->GTKAuthenticator) {
2512 wpa_group_setkeysdone(wpa_auth, group);
2513 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2514 group->GTKReKey) {
2515 wpa_group_setkeys(wpa_auth, group);
2516 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2517 if (group->GKeyDoneStations == 0)
2518 wpa_group_setkeysdone(wpa_auth, group);
2519 else if (group->GTKReKey)
2520 wpa_group_setkeys(wpa_auth, group);
2521 }
2522 }
2523
2524
wpa_sm_step(struct wpa_state_machine * sm)2525 static int wpa_sm_step(struct wpa_state_machine *sm)
2526 {
2527 if (sm == NULL)
2528 return 0;
2529
2530 if (sm->in_step_loop) {
2531 /* This should not happen, but if it does, make sure we do not
2532 * end up freeing the state machine too early by exiting the
2533 * recursive call. */
2534 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2535 return 0;
2536 }
2537
2538 sm->in_step_loop = 1;
2539 do {
2540 if (sm->pending_deinit)
2541 break;
2542
2543 sm->changed = FALSE;
2544 sm->wpa_auth->group->changed = FALSE;
2545
2546 SM_STEP_RUN(WPA_PTK);
2547 if (sm->pending_deinit)
2548 break;
2549 SM_STEP_RUN(WPA_PTK_GROUP);
2550 if (sm->pending_deinit)
2551 break;
2552 wpa_group_sm_step(sm->wpa_auth, sm->group);
2553 } while (sm->changed || sm->wpa_auth->group->changed);
2554 sm->in_step_loop = 0;
2555
2556 if (sm->pending_deinit) {
2557 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2558 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2559 wpa_free_sta_sm(sm);
2560 return 1;
2561 }
2562 return 0;
2563 }
2564
2565
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)2566 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2567 {
2568 struct wpa_state_machine *sm = eloop_ctx;
2569 wpa_sm_step(sm);
2570 }
2571
2572
wpa_auth_sm_notify(struct wpa_state_machine * sm)2573 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2574 {
2575 if (sm == NULL)
2576 return;
2577 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2578 }
2579
2580
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)2581 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2582 {
2583 int tmp, i;
2584 struct wpa_group *group;
2585
2586 if (wpa_auth == NULL)
2587 return;
2588
2589 group = wpa_auth->group;
2590
2591 for (i = 0; i < 2; i++) {
2592 tmp = group->GM;
2593 group->GM = group->GN;
2594 group->GN = tmp;
2595 #ifdef CONFIG_IEEE80211W
2596 tmp = group->GM_igtk;
2597 group->GM_igtk = group->GN_igtk;
2598 group->GN_igtk = tmp;
2599 #endif /* CONFIG_IEEE80211W */
2600 wpa_gtk_update(wpa_auth, group);
2601 wpa_group_config_group_keys(wpa_auth, group);
2602 }
2603 }
2604
2605
wpa_bool_txt(int bool)2606 static const char * wpa_bool_txt(int bool)
2607 {
2608 return bool ? "TRUE" : "FALSE";
2609 }
2610
2611
wpa_cipher_bits(int cipher)2612 static int wpa_cipher_bits(int cipher)
2613 {
2614 switch (cipher) {
2615 case WPA_CIPHER_CCMP:
2616 return 128;
2617 case WPA_CIPHER_TKIP:
2618 return 256;
2619 case WPA_CIPHER_WEP104:
2620 return 104;
2621 case WPA_CIPHER_WEP40:
2622 return 40;
2623 default:
2624 return 0;
2625 }
2626 }
2627
2628
2629 #define RSN_SUITE "%02x-%02x-%02x-%d"
2630 #define RSN_SUITE_ARG(s) \
2631 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2632
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)2633 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2634 {
2635 int len = 0, ret;
2636 char pmkid_txt[PMKID_LEN * 2 + 1];
2637 #ifdef CONFIG_RSN_PREAUTH
2638 const int preauth = 1;
2639 #else /* CONFIG_RSN_PREAUTH */
2640 const int preauth = 0;
2641 #endif /* CONFIG_RSN_PREAUTH */
2642
2643 if (wpa_auth == NULL)
2644 return len;
2645
2646 ret = os_snprintf(buf + len, buflen - len,
2647 "dot11RSNAOptionImplemented=TRUE\n"
2648 "dot11RSNAPreauthenticationImplemented=%s\n"
2649 "dot11RSNAEnabled=%s\n"
2650 "dot11RSNAPreauthenticationEnabled=%s\n",
2651 wpa_bool_txt(preauth),
2652 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2653 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2654 if (ret < 0 || (size_t) ret >= buflen - len)
2655 return len;
2656 len += ret;
2657
2658 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2659 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2660
2661 ret = os_snprintf(
2662 buf + len, buflen - len,
2663 "dot11RSNAConfigVersion=%u\n"
2664 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2665 /* FIX: dot11RSNAConfigGroupCipher */
2666 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2667 /* FIX: dot11RSNAConfigGroupRekeyTime */
2668 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2669 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2670 "dot11RSNAConfigGroupUpdateCount=%u\n"
2671 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2672 "dot11RSNAConfigGroupCipherSize=%u\n"
2673 "dot11RSNAConfigPMKLifetime=%u\n"
2674 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2675 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2676 "dot11RSNAConfigSATimeout=%u\n"
2677 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2678 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2679 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2680 "dot11RSNAPMKIDUsed=%s\n"
2681 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2682 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2683 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2684 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2685 "dot11RSNA4WayHandshakeFailures=%u\n"
2686 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2687 RSN_VERSION,
2688 !!wpa_auth->conf.wpa_strict_rekey,
2689 dot11RSNAConfigGroupUpdateCount,
2690 dot11RSNAConfigPairwiseUpdateCount,
2691 wpa_cipher_bits(wpa_auth->conf.wpa_group),
2692 dot11RSNAConfigPMKLifetime,
2693 dot11RSNAConfigPMKReauthThreshold,
2694 dot11RSNAConfigSATimeout,
2695 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2696 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2697 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2698 pmkid_txt,
2699 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2700 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2701 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2702 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2703 wpa_auth->dot11RSNA4WayHandshakeFailures);
2704 if (ret < 0 || (size_t) ret >= buflen - len)
2705 return len;
2706 len += ret;
2707
2708 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2709 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2710
2711 /* Private MIB */
2712 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2713 wpa_auth->group->wpa_group_state);
2714 if (ret < 0 || (size_t) ret >= buflen - len)
2715 return len;
2716 len += ret;
2717
2718 return len;
2719 }
2720
2721
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)2722 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2723 {
2724 int len = 0, ret;
2725 u32 pairwise = 0;
2726
2727 if (sm == NULL)
2728 return 0;
2729
2730 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2731
2732 /* dot11RSNAStatsEntry */
2733
2734 if (sm->wpa == WPA_VERSION_WPA) {
2735 if (sm->pairwise == WPA_CIPHER_CCMP)
2736 pairwise = WPA_CIPHER_SUITE_CCMP;
2737 else if (sm->pairwise == WPA_CIPHER_TKIP)
2738 pairwise = WPA_CIPHER_SUITE_TKIP;
2739 else if (sm->pairwise == WPA_CIPHER_WEP104)
2740 pairwise = WPA_CIPHER_SUITE_WEP104;
2741 else if (sm->pairwise == WPA_CIPHER_WEP40)
2742 pairwise = WPA_CIPHER_SUITE_WEP40;
2743 else if (sm->pairwise == WPA_CIPHER_NONE)
2744 pairwise = WPA_CIPHER_SUITE_NONE;
2745 } else if (sm->wpa == WPA_VERSION_WPA2) {
2746 if (sm->pairwise == WPA_CIPHER_CCMP)
2747 pairwise = RSN_CIPHER_SUITE_CCMP;
2748 else if (sm->pairwise == WPA_CIPHER_TKIP)
2749 pairwise = RSN_CIPHER_SUITE_TKIP;
2750 else if (sm->pairwise == WPA_CIPHER_WEP104)
2751 pairwise = RSN_CIPHER_SUITE_WEP104;
2752 else if (sm->pairwise == WPA_CIPHER_WEP40)
2753 pairwise = RSN_CIPHER_SUITE_WEP40;
2754 else if (sm->pairwise == WPA_CIPHER_NONE)
2755 pairwise = RSN_CIPHER_SUITE_NONE;
2756 } else
2757 return 0;
2758
2759 ret = os_snprintf(
2760 buf + len, buflen - len,
2761 /* TODO: dot11RSNAStatsIndex */
2762 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2763 "dot11RSNAStatsVersion=1\n"
2764 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2765 /* TODO: dot11RSNAStatsTKIPICVErrors */
2766 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2767 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2768 /* TODO: dot11RSNAStatsCCMPReplays */
2769 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2770 /* TODO: dot11RSNAStatsTKIPReplays */,
2771 MAC2STR(sm->addr),
2772 RSN_SUITE_ARG(pairwise),
2773 sm->dot11RSNAStatsTKIPLocalMICFailures,
2774 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2775 if (ret < 0 || (size_t) ret >= buflen - len)
2776 return len;
2777 len += ret;
2778
2779 /* Private MIB */
2780 ret = os_snprintf(buf + len, buflen - len,
2781 "hostapdWPAPTKState=%d\n"
2782 "hostapdWPAPTKGroupState=%d\n",
2783 sm->wpa_ptk_state,
2784 sm->wpa_ptk_group_state);
2785 if (ret < 0 || (size_t) ret >= buflen - len)
2786 return len;
2787 len += ret;
2788
2789 return len;
2790 }
2791
2792
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)2793 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2794 {
2795 if (wpa_auth)
2796 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2797 }
2798
2799
wpa_auth_pairwise_set(struct wpa_state_machine * sm)2800 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2801 {
2802 return sm && sm->pairwise_set;
2803 }
2804
2805
wpa_auth_get_pairwise(struct wpa_state_machine * sm)2806 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2807 {
2808 return sm->pairwise;
2809 }
2810
2811
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)2812 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2813 {
2814 if (sm == NULL)
2815 return -1;
2816 return sm->wpa_key_mgmt;
2817 }
2818
2819
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)2820 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2821 {
2822 if (sm == NULL)
2823 return 0;
2824 return sm->wpa;
2825 }
2826
2827
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)2828 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2829 struct rsn_pmksa_cache_entry *entry)
2830 {
2831 if (sm == NULL || sm->pmksa != entry)
2832 return -1;
2833 sm->pmksa = NULL;
2834 return 0;
2835 }
2836
2837
2838 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)2839 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
2840 {
2841 return sm ? sm->pmksa : NULL;
2842 }
2843
2844
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)2845 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
2846 {
2847 if (sm)
2848 sm->dot11RSNAStatsTKIPLocalMICFailures++;
2849 }
2850
2851
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)2852 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
2853 {
2854 if (wpa_auth == NULL)
2855 return NULL;
2856 *len = wpa_auth->wpa_ie_len;
2857 return wpa_auth->wpa_ie;
2858 }
2859
2860
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,int session_timeout,struct eapol_state_machine * eapol)2861 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
2862 int session_timeout, struct eapol_state_machine *eapol)
2863 {
2864 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
2865 sm->wpa_auth->conf.disable_pmksa_caching)
2866 return -1;
2867
2868 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
2869 sm->wpa_auth->addr, sm->addr, session_timeout,
2870 eapol, sm->wpa_key_mgmt))
2871 return 0;
2872
2873 return -1;
2874 }
2875
2876
wpa_auth_pmksa_add_preauth(struct wpa_authenticator * wpa_auth,const u8 * pmk,size_t len,const u8 * sta_addr,int session_timeout,struct eapol_state_machine * eapol)2877 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
2878 const u8 *pmk, size_t len, const u8 *sta_addr,
2879 int session_timeout,
2880 struct eapol_state_machine *eapol)
2881 {
2882 if (wpa_auth == NULL)
2883 return -1;
2884
2885 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
2886 sta_addr, session_timeout, eapol,
2887 WPA_KEY_MGMT_IEEE8021X))
2888 return 0;
2889
2890 return -1;
2891 }
2892
2893
2894 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)2895 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
2896 {
2897 struct wpa_group *group;
2898
2899 if (wpa_auth == NULL || wpa_auth->group == NULL)
2900 return NULL;
2901
2902 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
2903 vlan_id);
2904 group = wpa_group_init(wpa_auth, vlan_id, 0);
2905 if (group == NULL)
2906 return NULL;
2907
2908 group->next = wpa_auth->group->next;
2909 wpa_auth->group->next = group;
2910
2911 return group;
2912 }
2913
2914
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)2915 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
2916 {
2917 struct wpa_group *group;
2918
2919 if (sm == NULL || sm->wpa_auth == NULL)
2920 return 0;
2921
2922 group = sm->wpa_auth->group;
2923 while (group) {
2924 if (group->vlan_id == vlan_id)
2925 break;
2926 group = group->next;
2927 }
2928
2929 if (group == NULL) {
2930 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
2931 if (group == NULL)
2932 return -1;
2933 }
2934
2935 if (sm->group == group)
2936 return 0;
2937
2938 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
2939 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
2940
2941 sm->group = group;
2942 return 0;
2943 }
2944
2945
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)2946 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
2947 struct wpa_state_machine *sm, int ack)
2948 {
2949 if (wpa_auth == NULL || sm == NULL)
2950 return;
2951 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
2952 " ack=%d", MAC2STR(sm->addr), ack);
2953 if (sm->pending_1_of_4_timeout && ack) {
2954 /*
2955 * Some deployed supplicant implementations update their SNonce
2956 * for each EAPOL-Key 2/4 message even within the same 4-way
2957 * handshake and then fail to use the first SNonce when
2958 * deriving the PTK. This results in unsuccessful 4-way
2959 * handshake whenever the relatively short initial timeout is
2960 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
2961 * around this by increasing the timeout now that we know that
2962 * the station has received the frame.
2963 */
2964 int timeout_ms = eapol_key_timeout_subseq;
2965 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
2966 "timeout by %u ms because of acknowledged frame",
2967 timeout_ms);
2968 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
2969 eloop_register_timeout(timeout_ms / 1000,
2970 (timeout_ms % 1000) * 1000,
2971 wpa_send_eapol_timeout, wpa_auth, sm);
2972 }
2973 }
2974