Line data Source code
1 : /*
2 : * IEEE 802.11 RSN / WPA Authenticator
3 : * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "utils/includes.h"
10 :
11 : #include "utils/common.h"
12 : #include "utils/eloop.h"
13 : #include "utils/state_machine.h"
14 : #include "utils/bitfield.h"
15 : #include "common/ieee802_11_defs.h"
16 : #include "crypto/aes_wrap.h"
17 : #include "crypto/crypto.h"
18 : #include "crypto/sha1.h"
19 : #include "crypto/sha256.h"
20 : #include "crypto/random.h"
21 : #include "eapol_auth/eapol_auth_sm.h"
22 : #include "ap_config.h"
23 : #include "ieee802_11.h"
24 : #include "wpa_auth.h"
25 : #include "pmksa_cache_auth.h"
26 : #include "wpa_auth_i.h"
27 : #include "wpa_auth_ie.h"
28 :
29 : #define STATE_MACHINE_DATA struct wpa_state_machine
30 : #define STATE_MACHINE_DEBUG_PREFIX "WPA"
31 : #define STATE_MACHINE_ADDR sm->addr
32 :
33 :
34 : static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
35 : static int wpa_sm_step(struct wpa_state_machine *sm);
36 : static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
37 : static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
38 : static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
39 : struct wpa_group *group);
40 : static void wpa_request_new_ptk(struct wpa_state_machine *sm);
41 : static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
42 : struct wpa_group *group);
43 : static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
44 : struct wpa_group *group);
45 :
46 : static const u32 dot11RSNAConfigGroupUpdateCount = 4;
47 : static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
48 : static const u32 eapol_key_timeout_first = 100; /* ms */
49 : static const u32 eapol_key_timeout_subseq = 1000; /* ms */
50 : static const u32 eapol_key_timeout_first_group = 500; /* ms */
51 :
52 : /* TODO: make these configurable */
53 : static const int dot11RSNAConfigPMKLifetime = 43200;
54 : static const int dot11RSNAConfigPMKReauthThreshold = 70;
55 : static const int dot11RSNAConfigSATimeout = 60;
56 :
57 :
58 0 : static inline int wpa_auth_mic_failure_report(
59 : struct wpa_authenticator *wpa_auth, const u8 *addr)
60 : {
61 0 : if (wpa_auth->cb.mic_failure_report)
62 0 : return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
63 0 : return 0;
64 : }
65 :
66 :
67 0 : static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
68 : const u8 *addr, wpa_eapol_variable var,
69 : int value)
70 : {
71 0 : if (wpa_auth->cb.set_eapol)
72 0 : wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
73 0 : }
74 :
75 :
76 0 : static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
77 : const u8 *addr, wpa_eapol_variable var)
78 : {
79 0 : if (wpa_auth->cb.get_eapol == NULL)
80 0 : return -1;
81 0 : return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
82 : }
83 :
84 :
85 0 : static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
86 : const u8 *addr,
87 : const u8 *p2p_dev_addr,
88 : const u8 *prev_psk)
89 : {
90 0 : if (wpa_auth->cb.get_psk == NULL)
91 0 : return NULL;
92 0 : return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
93 : prev_psk);
94 : }
95 :
96 :
97 0 : static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
98 : const u8 *addr, u8 *msk, size_t *len)
99 : {
100 0 : if (wpa_auth->cb.get_msk == NULL)
101 0 : return -1;
102 0 : return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
103 : }
104 :
105 :
106 0 : static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
107 : int vlan_id,
108 : enum wpa_alg alg, const u8 *addr, int idx,
109 : u8 *key, size_t key_len)
110 : {
111 0 : if (wpa_auth->cb.set_key == NULL)
112 0 : return -1;
113 0 : return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
114 : key, key_len);
115 : }
116 :
117 :
118 0 : static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
119 : const u8 *addr, int idx, u8 *seq)
120 : {
121 0 : if (wpa_auth->cb.get_seqnum == NULL)
122 0 : return -1;
123 0 : return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
124 : }
125 :
126 :
127 : static inline int
128 0 : wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
129 : const u8 *data, size_t data_len, int encrypt)
130 : {
131 0 : if (wpa_auth->cb.send_eapol == NULL)
132 0 : return -1;
133 0 : return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
134 : encrypt);
135 : }
136 :
137 :
138 0 : int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
139 : int (*cb)(struct wpa_state_machine *sm, void *ctx),
140 : void *cb_ctx)
141 : {
142 0 : if (wpa_auth->cb.for_each_sta == NULL)
143 0 : return 0;
144 0 : return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
145 : }
146 :
147 :
148 0 : int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
149 : int (*cb)(struct wpa_authenticator *a, void *ctx),
150 : void *cb_ctx)
151 : {
152 0 : if (wpa_auth->cb.for_each_auth == NULL)
153 0 : return 0;
154 0 : return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
155 : }
156 :
157 :
158 0 : void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
159 : logger_level level, const char *txt)
160 : {
161 0 : if (wpa_auth->cb.logger == NULL)
162 0 : return;
163 0 : wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
164 : }
165 :
166 :
167 0 : void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
168 : logger_level level, const char *fmt, ...)
169 : {
170 : char *format;
171 : int maxlen;
172 : va_list ap;
173 :
174 0 : if (wpa_auth->cb.logger == NULL)
175 0 : return;
176 :
177 0 : maxlen = os_strlen(fmt) + 100;
178 0 : format = os_malloc(maxlen);
179 0 : if (!format)
180 0 : return;
181 :
182 0 : va_start(ap, fmt);
183 0 : vsnprintf(format, maxlen, fmt, ap);
184 0 : va_end(ap);
185 :
186 0 : wpa_auth_logger(wpa_auth, addr, level, format);
187 :
188 0 : os_free(format);
189 : }
190 :
191 :
192 0 : static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
193 : const u8 *addr)
194 : {
195 0 : if (wpa_auth->cb.disconnect == NULL)
196 0 : return;
197 0 : wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
198 0 : wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
199 : WLAN_REASON_PREV_AUTH_NOT_VALID);
200 : }
201 :
202 :
203 0 : static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
204 : {
205 0 : int ret = 0;
206 : #ifdef CONFIG_IEEE80211R
207 0 : if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
208 0 : ret = 1;
209 : #endif /* CONFIG_IEEE80211R */
210 : #ifdef CONFIG_IEEE80211W
211 0 : if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
212 0 : ret = 1;
213 : #endif /* CONFIG_IEEE80211W */
214 0 : if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
215 0 : ret = 1;
216 0 : return ret;
217 : }
218 :
219 :
220 0 : static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
221 : {
222 0 : struct wpa_authenticator *wpa_auth = eloop_ctx;
223 :
224 0 : if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
225 0 : wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
226 : "initialization.");
227 : } else {
228 0 : wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
229 0 : wpa_hexdump_key(MSG_DEBUG, "GMK",
230 0 : wpa_auth->group->GMK, WPA_GMK_LEN);
231 : }
232 :
233 0 : if (wpa_auth->conf.wpa_gmk_rekey) {
234 0 : eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
235 : wpa_rekey_gmk, wpa_auth, NULL);
236 : }
237 0 : }
238 :
239 :
240 0 : static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
241 : {
242 0 : struct wpa_authenticator *wpa_auth = eloop_ctx;
243 : struct wpa_group *group;
244 :
245 0 : wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
246 0 : for (group = wpa_auth->group; group; group = group->next) {
247 0 : group->GTKReKey = TRUE;
248 : do {
249 0 : group->changed = FALSE;
250 0 : wpa_group_sm_step(wpa_auth, group);
251 0 : } while (group->changed);
252 : }
253 :
254 0 : if (wpa_auth->conf.wpa_group_rekey) {
255 0 : eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
256 : 0, wpa_rekey_gtk, wpa_auth, NULL);
257 : }
258 0 : }
259 :
260 :
261 0 : static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
262 : {
263 0 : struct wpa_authenticator *wpa_auth = eloop_ctx;
264 0 : struct wpa_state_machine *sm = timeout_ctx;
265 :
266 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
267 0 : wpa_request_new_ptk(sm);
268 0 : wpa_sm_step(sm);
269 0 : }
270 :
271 :
272 0 : static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
273 : {
274 0 : if (sm->pmksa == ctx)
275 0 : sm->pmksa = NULL;
276 0 : return 0;
277 : }
278 :
279 :
280 0 : static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
281 : void *ctx)
282 : {
283 0 : struct wpa_authenticator *wpa_auth = ctx;
284 0 : wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
285 0 : }
286 :
287 :
288 0 : static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
289 : struct wpa_group *group)
290 : {
291 : u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
292 : u8 rkey[32];
293 : unsigned long ptr;
294 :
295 0 : if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
296 0 : return -1;
297 0 : wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
298 :
299 : /*
300 : * Counter = PRF-256(Random number, "Init Counter",
301 : * Local MAC Address || Time)
302 : */
303 0 : os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
304 0 : wpa_get_ntp_timestamp(buf + ETH_ALEN);
305 0 : ptr = (unsigned long) group;
306 0 : os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
307 0 : if (random_get_bytes(rkey, sizeof(rkey)) < 0)
308 0 : return -1;
309 :
310 0 : if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
311 0 : group->Counter, WPA_NONCE_LEN) < 0)
312 0 : return -1;
313 0 : wpa_hexdump_key(MSG_DEBUG, "Key Counter",
314 0 : group->Counter, WPA_NONCE_LEN);
315 :
316 0 : return 0;
317 : }
318 :
319 :
320 0 : static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
321 : int vlan_id, int delay_init)
322 : {
323 : struct wpa_group *group;
324 :
325 0 : group = os_zalloc(sizeof(struct wpa_group));
326 0 : if (group == NULL)
327 0 : return NULL;
328 :
329 0 : group->GTKAuthenticator = TRUE;
330 0 : group->vlan_id = vlan_id;
331 0 : group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
332 :
333 : if (random_pool_ready() != 1) {
334 : wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
335 : "for secure operations - update keys later when "
336 : "the first station connects");
337 : }
338 :
339 : /*
340 : * Set initial GMK/Counter value here. The actual values that will be
341 : * used in negotiations will be set once the first station tries to
342 : * connect. This allows more time for collecting additional randomness
343 : * on embedded devices.
344 : */
345 0 : if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
346 0 : wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
347 : "initialization.");
348 0 : os_free(group);
349 0 : return NULL;
350 : }
351 :
352 0 : group->GInit = TRUE;
353 0 : if (delay_init) {
354 0 : wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
355 : "until Beacon frames have been configured");
356 : /* Initialization is completed in wpa_init_keys(). */
357 : } else {
358 0 : wpa_group_sm_step(wpa_auth, group);
359 0 : group->GInit = FALSE;
360 0 : wpa_group_sm_step(wpa_auth, group);
361 : }
362 :
363 0 : return group;
364 : }
365 :
366 :
367 : /**
368 : * wpa_init - Initialize WPA authenticator
369 : * @addr: Authenticator address
370 : * @conf: Configuration for WPA authenticator
371 : * @cb: Callback functions for WPA authenticator
372 : * Returns: Pointer to WPA authenticator data or %NULL on failure
373 : */
374 0 : struct wpa_authenticator * wpa_init(const u8 *addr,
375 : struct wpa_auth_config *conf,
376 : struct wpa_auth_callbacks *cb)
377 : {
378 : struct wpa_authenticator *wpa_auth;
379 :
380 0 : wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
381 0 : if (wpa_auth == NULL)
382 0 : return NULL;
383 0 : os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
384 0 : os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
385 0 : os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
386 :
387 0 : if (wpa_auth_gen_wpa_ie(wpa_auth)) {
388 0 : wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
389 0 : os_free(wpa_auth);
390 0 : return NULL;
391 : }
392 :
393 0 : wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
394 0 : if (wpa_auth->group == NULL) {
395 0 : os_free(wpa_auth->wpa_ie);
396 0 : os_free(wpa_auth);
397 0 : return NULL;
398 : }
399 :
400 0 : wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
401 : wpa_auth);
402 0 : if (wpa_auth->pmksa == NULL) {
403 0 : wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
404 0 : os_free(wpa_auth->wpa_ie);
405 0 : os_free(wpa_auth);
406 0 : return NULL;
407 : }
408 :
409 : #ifdef CONFIG_IEEE80211R
410 0 : wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
411 0 : if (wpa_auth->ft_pmk_cache == NULL) {
412 0 : wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
413 0 : os_free(wpa_auth->wpa_ie);
414 0 : pmksa_cache_auth_deinit(wpa_auth->pmksa);
415 0 : os_free(wpa_auth);
416 0 : return NULL;
417 : }
418 : #endif /* CONFIG_IEEE80211R */
419 :
420 0 : if (wpa_auth->conf.wpa_gmk_rekey) {
421 0 : eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
422 : wpa_rekey_gmk, wpa_auth, NULL);
423 : }
424 :
425 0 : if (wpa_auth->conf.wpa_group_rekey) {
426 0 : eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
427 : wpa_rekey_gtk, wpa_auth, NULL);
428 : }
429 :
430 : #ifdef CONFIG_P2P
431 : if (WPA_GET_BE32(conf->ip_addr_start)) {
432 : int count = WPA_GET_BE32(conf->ip_addr_end) -
433 : WPA_GET_BE32(conf->ip_addr_start) + 1;
434 : if (count > 1000)
435 : count = 1000;
436 : if (count > 0)
437 : wpa_auth->ip_pool = bitfield_alloc(count);
438 : }
439 : #endif /* CONFIG_P2P */
440 :
441 0 : return wpa_auth;
442 : }
443 :
444 :
445 0 : int wpa_init_keys(struct wpa_authenticator *wpa_auth)
446 : {
447 0 : struct wpa_group *group = wpa_auth->group;
448 :
449 0 : wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
450 : "keys");
451 0 : wpa_group_sm_step(wpa_auth, group);
452 0 : group->GInit = FALSE;
453 0 : wpa_group_sm_step(wpa_auth, group);
454 0 : if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
455 0 : return -1;
456 0 : return 0;
457 : }
458 :
459 :
460 : /**
461 : * wpa_deinit - Deinitialize WPA authenticator
462 : * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
463 : */
464 0 : void wpa_deinit(struct wpa_authenticator *wpa_auth)
465 : {
466 : struct wpa_group *group, *prev;
467 :
468 0 : eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
469 0 : eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
470 :
471 : #ifdef CONFIG_PEERKEY
472 0 : while (wpa_auth->stsl_negotiations)
473 0 : wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
474 : #endif /* CONFIG_PEERKEY */
475 :
476 0 : pmksa_cache_auth_deinit(wpa_auth->pmksa);
477 :
478 : #ifdef CONFIG_IEEE80211R
479 0 : wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
480 0 : wpa_auth->ft_pmk_cache = NULL;
481 : #endif /* CONFIG_IEEE80211R */
482 :
483 : #ifdef CONFIG_P2P
484 : bitfield_free(wpa_auth->ip_pool);
485 : #endif /* CONFIG_P2P */
486 :
487 :
488 0 : os_free(wpa_auth->wpa_ie);
489 :
490 0 : group = wpa_auth->group;
491 0 : while (group) {
492 0 : prev = group;
493 0 : group = group->next;
494 0 : os_free(prev);
495 : }
496 :
497 0 : os_free(wpa_auth);
498 0 : }
499 :
500 :
501 : /**
502 : * wpa_reconfig - Update WPA authenticator configuration
503 : * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
504 : * @conf: Configuration for WPA authenticator
505 : */
506 0 : int wpa_reconfig(struct wpa_authenticator *wpa_auth,
507 : struct wpa_auth_config *conf)
508 : {
509 : struct wpa_group *group;
510 0 : if (wpa_auth == NULL)
511 0 : return 0;
512 :
513 0 : os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
514 0 : if (wpa_auth_gen_wpa_ie(wpa_auth)) {
515 0 : wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
516 0 : return -1;
517 : }
518 :
519 : /*
520 : * Reinitialize GTK to make sure it is suitable for the new
521 : * configuration.
522 : */
523 0 : group = wpa_auth->group;
524 0 : group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
525 0 : group->GInit = TRUE;
526 0 : wpa_group_sm_step(wpa_auth, group);
527 0 : group->GInit = FALSE;
528 0 : wpa_group_sm_step(wpa_auth, group);
529 :
530 0 : return 0;
531 : }
532 :
533 :
534 : struct wpa_state_machine *
535 0 : wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
536 : const u8 *p2p_dev_addr)
537 : {
538 : struct wpa_state_machine *sm;
539 :
540 0 : if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
541 0 : return NULL;
542 :
543 0 : sm = os_zalloc(sizeof(struct wpa_state_machine));
544 0 : if (sm == NULL)
545 0 : return NULL;
546 0 : os_memcpy(sm->addr, addr, ETH_ALEN);
547 0 : if (p2p_dev_addr)
548 0 : os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
549 :
550 0 : sm->wpa_auth = wpa_auth;
551 0 : sm->group = wpa_auth->group;
552 :
553 0 : return sm;
554 : }
555 :
556 :
557 0 : int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
558 : struct wpa_state_machine *sm)
559 : {
560 0 : if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
561 0 : return -1;
562 :
563 : #ifdef CONFIG_IEEE80211R
564 0 : if (sm->ft_completed) {
565 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
566 : "FT authentication already completed - do not "
567 : "start 4-way handshake");
568 : /* Go to PTKINITDONE state to allow GTK rekeying */
569 0 : sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
570 0 : return 0;
571 : }
572 : #endif /* CONFIG_IEEE80211R */
573 :
574 0 : if (sm->started) {
575 0 : os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
576 0 : sm->ReAuthenticationRequest = TRUE;
577 0 : return wpa_sm_step(sm);
578 : }
579 :
580 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
581 : "start authentication");
582 0 : sm->started = 1;
583 :
584 0 : sm->Init = TRUE;
585 0 : if (wpa_sm_step(sm) == 1)
586 0 : return 1; /* should not really happen */
587 0 : sm->Init = FALSE;
588 0 : sm->AuthenticationRequest = TRUE;
589 0 : return wpa_sm_step(sm);
590 : }
591 :
592 :
593 0 : void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
594 : {
595 : /* WPA/RSN was not used - clear WPA state. This is needed if the STA
596 : * reassociates back to the same AP while the previous entry for the
597 : * STA has not yet been removed. */
598 0 : if (sm == NULL)
599 0 : return;
600 :
601 0 : sm->wpa_key_mgmt = 0;
602 : }
603 :
604 :
605 0 : static void wpa_free_sta_sm(struct wpa_state_machine *sm)
606 : {
607 : #ifdef CONFIG_P2P
608 : if (WPA_GET_BE32(sm->ip_addr)) {
609 : u32 start;
610 : wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
611 : "address %u.%u.%u.%u from " MACSTR,
612 : sm->ip_addr[0], sm->ip_addr[1],
613 : sm->ip_addr[2], sm->ip_addr[3],
614 : MAC2STR(sm->addr));
615 : start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
616 : bitfield_clear(sm->wpa_auth->ip_pool,
617 : WPA_GET_BE32(sm->ip_addr) - start);
618 : }
619 : #endif /* CONFIG_P2P */
620 0 : if (sm->GUpdateStationKeys) {
621 0 : sm->group->GKeyDoneStations--;
622 0 : sm->GUpdateStationKeys = FALSE;
623 : }
624 : #ifdef CONFIG_IEEE80211R
625 0 : os_free(sm->assoc_resp_ftie);
626 0 : wpabuf_free(sm->ft_pending_req_ies);
627 : #endif /* CONFIG_IEEE80211R */
628 0 : os_free(sm->last_rx_eapol_key);
629 0 : os_free(sm->wpa_ie);
630 0 : os_free(sm);
631 0 : }
632 :
633 :
634 0 : void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
635 : {
636 0 : if (sm == NULL)
637 0 : return;
638 :
639 0 : if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
640 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
641 : "strict rekeying - force GTK rekey since STA "
642 : "is leaving");
643 0 : eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
644 0 : eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
645 : NULL);
646 : }
647 :
648 0 : eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
649 0 : sm->pending_1_of_4_timeout = 0;
650 0 : eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
651 0 : eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
652 0 : if (sm->in_step_loop) {
653 : /* Must not free state machine while wpa_sm_step() is running.
654 : * Freeing will be completed in the end of wpa_sm_step(). */
655 0 : wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
656 0 : "machine deinit for " MACSTR, MAC2STR(sm->addr));
657 0 : sm->pending_deinit = 1;
658 : } else
659 0 : wpa_free_sta_sm(sm);
660 : }
661 :
662 :
663 0 : static void wpa_request_new_ptk(struct wpa_state_machine *sm)
664 : {
665 0 : if (sm == NULL)
666 0 : return;
667 :
668 0 : sm->PTKRequest = TRUE;
669 0 : sm->PTK_valid = 0;
670 : }
671 :
672 :
673 0 : static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
674 : const u8 *replay_counter)
675 : {
676 : int i;
677 0 : for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
678 0 : if (!ctr[i].valid)
679 0 : break;
680 0 : if (os_memcmp(replay_counter, ctr[i].counter,
681 : WPA_REPLAY_COUNTER_LEN) == 0)
682 0 : return 1;
683 : }
684 0 : return 0;
685 : }
686 :
687 :
688 0 : static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
689 : const u8 *replay_counter)
690 : {
691 : int i;
692 0 : for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
693 0 : if (ctr[i].valid &&
694 0 : (replay_counter == NULL ||
695 0 : os_memcmp(replay_counter, ctr[i].counter,
696 : WPA_REPLAY_COUNTER_LEN) == 0))
697 0 : ctr[i].valid = FALSE;
698 : }
699 0 : }
700 :
701 :
702 : #ifdef CONFIG_IEEE80211R
703 0 : static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
704 : struct wpa_state_machine *sm,
705 : struct wpa_eapol_ie_parse *kde)
706 : {
707 : struct wpa_ie_data ie;
708 : struct rsn_mdie *mdie;
709 :
710 0 : if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
711 0 : ie.num_pmkid != 1 || ie.pmkid == NULL) {
712 0 : wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
713 : "FT 4-way handshake message 2/4");
714 0 : return -1;
715 : }
716 :
717 0 : os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
718 0 : wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
719 0 : sm->sup_pmk_r1_name, PMKID_LEN);
720 :
721 0 : if (!kde->mdie || !kde->ftie) {
722 0 : wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
723 0 : "message 2/4", kde->mdie ? "FTIE" : "MDIE");
724 0 : return -1;
725 : }
726 :
727 0 : mdie = (struct rsn_mdie *) (kde->mdie + 2);
728 0 : if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
729 0 : os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
730 : MOBILITY_DOMAIN_ID_LEN) != 0) {
731 0 : wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
732 0 : return -1;
733 : }
734 :
735 0 : if (sm->assoc_resp_ftie &&
736 0 : (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
737 0 : os_memcmp(kde->ftie, sm->assoc_resp_ftie,
738 : 2 + sm->assoc_resp_ftie[1]) != 0)) {
739 0 : wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
740 0 : wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
741 0 : kde->ftie, kde->ftie_len);
742 0 : wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
743 0 : sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
744 0 : return -1;
745 : }
746 :
747 0 : return 0;
748 : }
749 : #endif /* CONFIG_IEEE80211R */
750 :
751 :
752 0 : static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
753 : struct wpa_state_machine *sm, int group)
754 : {
755 : /* Supplicant reported a Michael MIC error */
756 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
757 : "received EAPOL-Key Error Request "
758 : "(STA detected Michael MIC failure (group=%d))",
759 : group);
760 :
761 0 : if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
762 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
763 : "ignore Michael MIC failure report since "
764 : "group cipher is not TKIP");
765 0 : } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
766 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
767 : "ignore Michael MIC failure report since "
768 : "pairwise cipher is not TKIP");
769 : } else {
770 0 : if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
771 0 : return 1; /* STA entry was removed */
772 0 : sm->dot11RSNAStatsTKIPRemoteMICFailures++;
773 0 : wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
774 : }
775 :
776 : /*
777 : * Error report is not a request for a new key handshake, but since
778 : * Authenticator may do it, let's change the keys now anyway.
779 : */
780 0 : wpa_request_new_ptk(sm);
781 0 : return 0;
782 : }
783 :
784 :
785 0 : void wpa_receive(struct wpa_authenticator *wpa_auth,
786 : struct wpa_state_machine *sm,
787 : u8 *data, size_t data_len)
788 : {
789 : struct ieee802_1x_hdr *hdr;
790 : struct wpa_eapol_key *key;
791 : u16 key_info, key_data_length;
792 : enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
793 : SMK_M1, SMK_M3, SMK_ERROR } msg;
794 : char *msgtxt;
795 : struct wpa_eapol_ie_parse kde;
796 : int ft;
797 : const u8 *eapol_key_ie;
798 : size_t eapol_key_ie_len;
799 :
800 0 : if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
801 0 : return;
802 :
803 0 : if (data_len < sizeof(*hdr) + sizeof(*key))
804 0 : return;
805 :
806 0 : hdr = (struct ieee802_1x_hdr *) data;
807 0 : key = (struct wpa_eapol_key *) (hdr + 1);
808 0 : key_info = WPA_GET_BE16(key->key_info);
809 0 : key_data_length = WPA_GET_BE16(key->key_data_length);
810 0 : wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
811 : " key_info=0x%x type=%u key_data_length=%u",
812 0 : MAC2STR(sm->addr), key_info, key->type, key_data_length);
813 0 : if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
814 0 : wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
815 : "key_data overflow (%d > %lu)",
816 : key_data_length,
817 : (unsigned long) (data_len - sizeof(*hdr) -
818 : sizeof(*key)));
819 0 : return;
820 : }
821 :
822 0 : if (sm->wpa == WPA_VERSION_WPA2) {
823 0 : if (key->type == EAPOL_KEY_TYPE_WPA) {
824 : /*
825 : * Some deployed station implementations seem to send
826 : * msg 4/4 with incorrect type value in WPA2 mode.
827 : */
828 0 : wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
829 : "with unexpected WPA type in RSN mode");
830 0 : } else if (key->type != EAPOL_KEY_TYPE_RSN) {
831 0 : wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
832 : "unexpected type %d in RSN mode",
833 0 : key->type);
834 0 : return;
835 : }
836 : } else {
837 0 : if (key->type != EAPOL_KEY_TYPE_WPA) {
838 0 : wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
839 : "unexpected type %d in WPA mode",
840 0 : key->type);
841 0 : return;
842 : }
843 : }
844 :
845 0 : wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
846 : WPA_NONCE_LEN);
847 0 : wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
848 0 : key->replay_counter, WPA_REPLAY_COUNTER_LEN);
849 :
850 : /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
851 : * are set */
852 :
853 0 : if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
854 : (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
855 0 : if (key_info & WPA_KEY_INFO_ERROR) {
856 0 : msg = SMK_ERROR;
857 0 : msgtxt = "SMK Error";
858 : } else {
859 0 : msg = SMK_M1;
860 0 : msgtxt = "SMK M1";
861 : }
862 0 : } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
863 0 : msg = SMK_M3;
864 0 : msgtxt = "SMK M3";
865 0 : } else if (key_info & WPA_KEY_INFO_REQUEST) {
866 0 : msg = REQUEST;
867 0 : msgtxt = "Request";
868 0 : } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
869 0 : msg = GROUP_2;
870 0 : msgtxt = "2/2 Group";
871 0 : } else if (key_data_length == 0) {
872 0 : msg = PAIRWISE_4;
873 0 : msgtxt = "4/4 Pairwise";
874 : } else {
875 0 : msg = PAIRWISE_2;
876 0 : msgtxt = "2/4 Pairwise";
877 : }
878 :
879 : /* TODO: key_info type validation for PeerKey */
880 0 : if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
881 : msg == GROUP_2) {
882 0 : u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
883 0 : if (sm->pairwise == WPA_CIPHER_CCMP ||
884 0 : sm->pairwise == WPA_CIPHER_GCMP) {
885 0 : if (wpa_use_aes_cmac(sm) &&
886 0 : sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
887 : ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
888 0 : wpa_auth_logger(wpa_auth, sm->addr,
889 : LOGGER_WARNING,
890 : "advertised support for "
891 : "AES-128-CMAC, but did not "
892 : "use it");
893 0 : return;
894 : }
895 :
896 0 : if (!wpa_use_aes_cmac(sm) &&
897 : ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
898 0 : wpa_auth_logger(wpa_auth, sm->addr,
899 : LOGGER_WARNING,
900 : "did not use HMAC-SHA1-AES "
901 : "with CCMP/GCMP");
902 0 : return;
903 : }
904 : }
905 : }
906 :
907 0 : if (key_info & WPA_KEY_INFO_REQUEST) {
908 0 : if (sm->req_replay_counter_used &&
909 0 : os_memcmp(key->replay_counter, sm->req_replay_counter,
910 : WPA_REPLAY_COUNTER_LEN) <= 0) {
911 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
912 : "received EAPOL-Key request with "
913 : "replayed counter");
914 0 : return;
915 : }
916 : }
917 :
918 0 : if (!(key_info & WPA_KEY_INFO_REQUEST) &&
919 0 : !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
920 : int i;
921 :
922 0 : if (msg == PAIRWISE_2 &&
923 0 : wpa_replay_counter_valid(sm->prev_key_replay,
924 0 : key->replay_counter) &&
925 0 : sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
926 0 : os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
927 : {
928 : /*
929 : * Some supplicant implementations (e.g., Windows XP
930 : * WZC) update SNonce for each EAPOL-Key 2/4. This
931 : * breaks the workaround on accepting any of the
932 : * pending requests, so allow the SNonce to be updated
933 : * even if we have already sent out EAPOL-Key 3/4.
934 : */
935 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
936 : "Process SNonce update from STA "
937 : "based on retransmitted EAPOL-Key "
938 : "1/4");
939 0 : sm->update_snonce = 1;
940 0 : wpa_replay_counter_mark_invalid(sm->prev_key_replay,
941 0 : key->replay_counter);
942 0 : goto continue_processing;
943 : }
944 :
945 0 : if (msg == PAIRWISE_2 &&
946 0 : wpa_replay_counter_valid(sm->prev_key_replay,
947 0 : key->replay_counter) &&
948 0 : sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
949 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
950 : "ignore retransmitted EAPOL-Key %s - "
951 : "SNonce did not change", msgtxt);
952 : } else {
953 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
954 : "received EAPOL-Key %s with "
955 : "unexpected replay counter", msgtxt);
956 : }
957 0 : for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
958 0 : if (!sm->key_replay[i].valid)
959 0 : break;
960 0 : wpa_hexdump(MSG_DEBUG, "pending replay counter",
961 0 : sm->key_replay[i].counter,
962 : WPA_REPLAY_COUNTER_LEN);
963 : }
964 0 : wpa_hexdump(MSG_DEBUG, "received replay counter",
965 0 : key->replay_counter, WPA_REPLAY_COUNTER_LEN);
966 0 : return;
967 : }
968 :
969 : continue_processing:
970 0 : switch (msg) {
971 : case PAIRWISE_2:
972 0 : if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
973 0 : sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
974 0 : (!sm->update_snonce ||
975 0 : sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
976 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
977 : "received EAPOL-Key msg 2/4 in "
978 : "invalid state (%d) - dropped",
979 0 : sm->wpa_ptk_state);
980 0 : return;
981 : }
982 : random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
983 0 : if (sm->group->reject_4way_hs_for_entropy) {
984 : /*
985 : * The system did not have enough entropy to generate
986 : * strong random numbers. Reject the first 4-way
987 : * handshake(s) and collect some entropy based on the
988 : * information from it. Once enough entropy is
989 : * available, the next atempt will trigger GMK/Key
990 : * Counter update and the station will be allowed to
991 : * continue.
992 : */
993 0 : wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
994 : "collect more entropy for random number "
995 : "generation");
996 : random_mark_pool_ready();
997 0 : wpa_sta_disconnect(wpa_auth, sm->addr);
998 0 : return;
999 : }
1000 0 : if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
1001 : &kde) < 0) {
1002 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1003 : "received EAPOL-Key msg 2/4 with "
1004 : "invalid Key Data contents");
1005 0 : return;
1006 : }
1007 0 : if (kde.rsn_ie) {
1008 0 : eapol_key_ie = kde.rsn_ie;
1009 0 : eapol_key_ie_len = kde.rsn_ie_len;
1010 0 : } else if (kde.osen) {
1011 0 : eapol_key_ie = kde.osen;
1012 0 : eapol_key_ie_len = kde.osen_len;
1013 : } else {
1014 0 : eapol_key_ie = kde.wpa_ie;
1015 0 : eapol_key_ie_len = kde.wpa_ie_len;
1016 : }
1017 0 : ft = sm->wpa == WPA_VERSION_WPA2 &&
1018 0 : wpa_key_mgmt_ft(sm->wpa_key_mgmt);
1019 0 : if (sm->wpa_ie == NULL ||
1020 0 : wpa_compare_rsn_ie(ft,
1021 0 : sm->wpa_ie, sm->wpa_ie_len,
1022 : eapol_key_ie, eapol_key_ie_len)) {
1023 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1024 : "WPA IE from (Re)AssocReq did not "
1025 : "match with msg 2/4");
1026 0 : if (sm->wpa_ie) {
1027 0 : wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
1028 0 : sm->wpa_ie, sm->wpa_ie_len);
1029 : }
1030 0 : wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
1031 : eapol_key_ie, eapol_key_ie_len);
1032 : /* MLME-DEAUTHENTICATE.request */
1033 0 : wpa_sta_disconnect(wpa_auth, sm->addr);
1034 0 : return;
1035 : }
1036 : #ifdef CONFIG_IEEE80211R
1037 0 : if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
1038 0 : wpa_sta_disconnect(wpa_auth, sm->addr);
1039 0 : return;
1040 : }
1041 : #endif /* CONFIG_IEEE80211R */
1042 : #ifdef CONFIG_P2P
1043 : if (kde.ip_addr_req && kde.ip_addr_req[0] &&
1044 : wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
1045 : int idx;
1046 : wpa_printf(MSG_DEBUG, "P2P: IP address requested in "
1047 : "EAPOL-Key exchange");
1048 : idx = bitfield_get_first_zero(wpa_auth->ip_pool);
1049 : if (idx >= 0) {
1050 : u32 start = WPA_GET_BE32(wpa_auth->conf.
1051 : ip_addr_start);
1052 : bitfield_set(wpa_auth->ip_pool, idx);
1053 : WPA_PUT_BE32(sm->ip_addr, start + idx);
1054 : wpa_printf(MSG_DEBUG, "P2P: Assigned IP "
1055 : "address %u.%u.%u.%u to " MACSTR,
1056 : sm->ip_addr[0], sm->ip_addr[1],
1057 : sm->ip_addr[2], sm->ip_addr[3],
1058 : MAC2STR(sm->addr));
1059 : }
1060 : }
1061 : #endif /* CONFIG_P2P */
1062 0 : break;
1063 : case PAIRWISE_4:
1064 0 : if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1065 0 : !sm->PTK_valid) {
1066 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1067 : "received EAPOL-Key msg 4/4 in "
1068 : "invalid state (%d) - dropped",
1069 0 : sm->wpa_ptk_state);
1070 0 : return;
1071 : }
1072 0 : break;
1073 : case GROUP_2:
1074 0 : if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1075 0 : || !sm->PTK_valid) {
1076 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1077 : "received EAPOL-Key msg 2/2 in "
1078 : "invalid state (%d) - dropped",
1079 0 : sm->wpa_ptk_group_state);
1080 0 : return;
1081 : }
1082 0 : break;
1083 : #ifdef CONFIG_PEERKEY
1084 : case SMK_M1:
1085 : case SMK_M3:
1086 : case SMK_ERROR:
1087 0 : if (!wpa_auth->conf.peerkey) {
1088 0 : wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1089 : "PeerKey use disabled - ignoring message");
1090 0 : return;
1091 : }
1092 0 : if (!sm->PTK_valid) {
1093 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1094 : "received EAPOL-Key msg SMK in "
1095 : "invalid state - dropped");
1096 0 : return;
1097 : }
1098 0 : break;
1099 : #else /* CONFIG_PEERKEY */
1100 : case SMK_M1:
1101 : case SMK_M3:
1102 : case SMK_ERROR:
1103 : return; /* STSL disabled - ignore SMK messages */
1104 : #endif /* CONFIG_PEERKEY */
1105 : case REQUEST:
1106 0 : break;
1107 : }
1108 :
1109 0 : wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1110 : "received EAPOL-Key frame (%s)", msgtxt);
1111 :
1112 0 : if (key_info & WPA_KEY_INFO_ACK) {
1113 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1114 : "received invalid EAPOL-Key: Key Ack set");
1115 0 : return;
1116 : }
1117 :
1118 0 : if (!(key_info & WPA_KEY_INFO_MIC)) {
1119 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1120 : "received invalid EAPOL-Key: Key MIC not set");
1121 0 : return;
1122 : }
1123 :
1124 0 : sm->MICVerified = FALSE;
1125 0 : if (sm->PTK_valid && !sm->update_snonce) {
1126 0 : if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1127 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1128 : "received EAPOL-Key with invalid MIC");
1129 0 : return;
1130 : }
1131 0 : sm->MICVerified = TRUE;
1132 0 : eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1133 0 : sm->pending_1_of_4_timeout = 0;
1134 : }
1135 :
1136 0 : if (key_info & WPA_KEY_INFO_REQUEST) {
1137 0 : if (sm->MICVerified) {
1138 0 : sm->req_replay_counter_used = 1;
1139 0 : os_memcpy(sm->req_replay_counter, key->replay_counter,
1140 : WPA_REPLAY_COUNTER_LEN);
1141 : } else {
1142 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1143 : "received EAPOL-Key request with "
1144 : "invalid MIC");
1145 0 : return;
1146 : }
1147 :
1148 : /*
1149 : * TODO: should decrypt key data field if encryption was used;
1150 : * even though MAC address KDE is not normally encrypted,
1151 : * supplicant is allowed to encrypt it.
1152 : */
1153 0 : if (msg == SMK_ERROR) {
1154 : #ifdef CONFIG_PEERKEY
1155 0 : wpa_smk_error(wpa_auth, sm, key);
1156 : #endif /* CONFIG_PEERKEY */
1157 0 : return;
1158 0 : } else if (key_info & WPA_KEY_INFO_ERROR) {
1159 0 : if (wpa_receive_error_report(
1160 : wpa_auth, sm,
1161 0 : !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1162 0 : return; /* STA entry was removed */
1163 0 : } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1164 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1165 : "received EAPOL-Key Request for new "
1166 : "4-Way Handshake");
1167 0 : wpa_request_new_ptk(sm);
1168 : #ifdef CONFIG_PEERKEY
1169 0 : } else if (msg == SMK_M1) {
1170 0 : wpa_smk_m1(wpa_auth, sm, key);
1171 : #endif /* CONFIG_PEERKEY */
1172 0 : } else if (key_data_length > 0 &&
1173 0 : wpa_parse_kde_ies((const u8 *) (key + 1),
1174 0 : key_data_length, &kde) == 0 &&
1175 0 : kde.mac_addr) {
1176 : } else {
1177 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1178 : "received EAPOL-Key Request for GTK "
1179 : "rekeying");
1180 0 : eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1181 0 : wpa_rekey_gtk(wpa_auth, NULL);
1182 : }
1183 : } else {
1184 : /* Do not allow the same key replay counter to be reused. */
1185 0 : wpa_replay_counter_mark_invalid(sm->key_replay,
1186 0 : key->replay_counter);
1187 :
1188 0 : if (msg == PAIRWISE_2) {
1189 : /*
1190 : * Maintain a copy of the pending EAPOL-Key frames in
1191 : * case the EAPOL-Key frame was retransmitted. This is
1192 : * needed to allow EAPOL-Key msg 2/4 reply to another
1193 : * pending msg 1/4 to update the SNonce to work around
1194 : * unexpected supplicant behavior.
1195 : */
1196 0 : os_memcpy(sm->prev_key_replay, sm->key_replay,
1197 : sizeof(sm->key_replay));
1198 : } else {
1199 0 : os_memset(sm->prev_key_replay, 0,
1200 : sizeof(sm->prev_key_replay));
1201 : }
1202 :
1203 : /*
1204 : * Make sure old valid counters are not accepted anymore and
1205 : * do not get copied again.
1206 : */
1207 0 : wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1208 : }
1209 :
1210 : #ifdef CONFIG_PEERKEY
1211 0 : if (msg == SMK_M3) {
1212 0 : wpa_smk_m3(wpa_auth, sm, key);
1213 0 : return;
1214 : }
1215 : #endif /* CONFIG_PEERKEY */
1216 :
1217 0 : os_free(sm->last_rx_eapol_key);
1218 0 : sm->last_rx_eapol_key = os_malloc(data_len);
1219 0 : if (sm->last_rx_eapol_key == NULL)
1220 0 : return;
1221 0 : os_memcpy(sm->last_rx_eapol_key, data, data_len);
1222 0 : sm->last_rx_eapol_key_len = data_len;
1223 :
1224 0 : sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1225 0 : sm->EAPOLKeyReceived = TRUE;
1226 0 : sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1227 0 : sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1228 0 : os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1229 0 : wpa_sm_step(sm);
1230 : }
1231 :
1232 :
1233 0 : static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1234 : const u8 *gnonce, u8 *gtk, size_t gtk_len)
1235 : {
1236 : u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1237 : u8 *pos;
1238 0 : int ret = 0;
1239 :
1240 : /* GTK = PRF-X(GMK, "Group key expansion",
1241 : * AA || GNonce || Time || random data)
1242 : * The example described in the IEEE 802.11 standard uses only AA and
1243 : * GNonce as inputs here. Add some more entropy since this derivation
1244 : * is done only at the Authenticator and as such, does not need to be
1245 : * exactly same.
1246 : */
1247 0 : os_memcpy(data, addr, ETH_ALEN);
1248 0 : os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1249 0 : pos = data + ETH_ALEN + WPA_NONCE_LEN;
1250 0 : wpa_get_ntp_timestamp(pos);
1251 0 : pos += 8;
1252 0 : if (random_get_bytes(pos, 16) < 0)
1253 0 : ret = -1;
1254 :
1255 : #ifdef CONFIG_IEEE80211W
1256 0 : sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1257 : #else /* CONFIG_IEEE80211W */
1258 : if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1259 : < 0)
1260 : ret = -1;
1261 : #endif /* CONFIG_IEEE80211W */
1262 :
1263 0 : return ret;
1264 : }
1265 :
1266 :
1267 0 : static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1268 : {
1269 0 : struct wpa_authenticator *wpa_auth = eloop_ctx;
1270 0 : struct wpa_state_machine *sm = timeout_ctx;
1271 :
1272 0 : sm->pending_1_of_4_timeout = 0;
1273 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1274 0 : sm->TimeoutEvt = TRUE;
1275 0 : wpa_sm_step(sm);
1276 0 : }
1277 :
1278 :
1279 0 : void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1280 : struct wpa_state_machine *sm, int key_info,
1281 : const u8 *key_rsc, const u8 *nonce,
1282 : const u8 *kde, size_t kde_len,
1283 : int keyidx, int encr, int force_version)
1284 : {
1285 : struct ieee802_1x_hdr *hdr;
1286 : struct wpa_eapol_key *key;
1287 : size_t len;
1288 : int alg;
1289 0 : int key_data_len, pad_len = 0;
1290 : u8 *buf, *pos;
1291 : int version, pairwise;
1292 : int i;
1293 :
1294 0 : len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1295 :
1296 0 : if (force_version)
1297 0 : version = force_version;
1298 0 : else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
1299 0 : version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1300 0 : else if (wpa_use_aes_cmac(sm))
1301 0 : version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1302 0 : else if (sm->pairwise != WPA_CIPHER_TKIP)
1303 0 : version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1304 : else
1305 0 : version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1306 :
1307 0 : pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1308 :
1309 0 : wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1310 : "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1311 : "encr=%d)",
1312 : version,
1313 0 : (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1314 0 : (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1315 0 : (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1316 0 : (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1317 : pairwise, (unsigned long) kde_len, keyidx, encr);
1318 :
1319 0 : key_data_len = kde_len;
1320 :
1321 0 : if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1322 0 : sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1323 0 : version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1324 0 : pad_len = key_data_len % 8;
1325 0 : if (pad_len)
1326 0 : pad_len = 8 - pad_len;
1327 0 : key_data_len += pad_len + 8;
1328 : }
1329 :
1330 0 : len += key_data_len;
1331 :
1332 0 : hdr = os_zalloc(len);
1333 0 : if (hdr == NULL)
1334 0 : return;
1335 0 : hdr->version = wpa_auth->conf.eapol_version;
1336 0 : hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1337 0 : hdr->length = host_to_be16(len - sizeof(*hdr));
1338 0 : key = (struct wpa_eapol_key *) (hdr + 1);
1339 :
1340 0 : key->type = sm->wpa == WPA_VERSION_WPA2 ?
1341 : EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1342 0 : key_info |= version;
1343 0 : if (encr && sm->wpa == WPA_VERSION_WPA2)
1344 0 : key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1345 0 : if (sm->wpa != WPA_VERSION_WPA2)
1346 0 : key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1347 0 : WPA_PUT_BE16(key->key_info, key_info);
1348 :
1349 0 : alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1350 0 : WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1351 0 : if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1352 0 : WPA_PUT_BE16(key->key_length, 0);
1353 :
1354 : /* FIX: STSL: what to use as key_replay_counter? */
1355 0 : for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1356 0 : sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1357 0 : os_memcpy(sm->key_replay[i].counter,
1358 : sm->key_replay[i - 1].counter,
1359 : WPA_REPLAY_COUNTER_LEN);
1360 : }
1361 0 : inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1362 0 : os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1363 : WPA_REPLAY_COUNTER_LEN);
1364 0 : sm->key_replay[0].valid = TRUE;
1365 :
1366 0 : if (nonce)
1367 0 : os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1368 :
1369 0 : if (key_rsc)
1370 0 : os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1371 :
1372 0 : if (kde && !encr) {
1373 0 : os_memcpy(key + 1, kde, kde_len);
1374 0 : WPA_PUT_BE16(key->key_data_length, kde_len);
1375 0 : } else if (encr && kde) {
1376 0 : buf = os_zalloc(key_data_len);
1377 0 : if (buf == NULL) {
1378 0 : os_free(hdr);
1379 0 : return;
1380 : }
1381 0 : pos = buf;
1382 0 : os_memcpy(pos, kde, kde_len);
1383 0 : pos += kde_len;
1384 :
1385 0 : if (pad_len)
1386 0 : *pos++ = 0xdd;
1387 :
1388 0 : wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1389 : buf, key_data_len);
1390 0 : if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1391 0 : sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1392 : version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1393 0 : if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1394 : (u8 *) (key + 1))) {
1395 0 : os_free(hdr);
1396 0 : os_free(buf);
1397 0 : return;
1398 : }
1399 0 : WPA_PUT_BE16(key->key_data_length, key_data_len);
1400 : } else {
1401 : u8 ek[32];
1402 0 : os_memcpy(key->key_iv,
1403 : sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1404 0 : inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1405 0 : os_memcpy(ek, key->key_iv, 16);
1406 0 : os_memcpy(ek + 16, sm->PTK.kek, 16);
1407 0 : os_memcpy(key + 1, buf, key_data_len);
1408 0 : rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1409 0 : WPA_PUT_BE16(key->key_data_length, key_data_len);
1410 : }
1411 0 : os_free(buf);
1412 : }
1413 :
1414 0 : if (key_info & WPA_KEY_INFO_MIC) {
1415 0 : if (!sm->PTK_valid) {
1416 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1417 : "PTK not valid when sending EAPOL-Key "
1418 : "frame");
1419 0 : os_free(hdr);
1420 0 : return;
1421 : }
1422 0 : wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1423 0 : key->key_mic);
1424 : #ifdef CONFIG_TESTING_OPTIONS
1425 0 : if (!pairwise &&
1426 0 : wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1427 0 : drand48() <
1428 0 : wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1429 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1430 : "Corrupting group EAPOL-Key Key MIC");
1431 0 : key->key_mic[0]++;
1432 : }
1433 : #endif /* CONFIG_TESTING_OPTIONS */
1434 : }
1435 :
1436 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1437 : 1);
1438 0 : wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1439 0 : sm->pairwise_set);
1440 0 : os_free(hdr);
1441 : }
1442 :
1443 :
1444 0 : static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1445 : struct wpa_state_machine *sm, int key_info,
1446 : const u8 *key_rsc, const u8 *nonce,
1447 : const u8 *kde, size_t kde_len,
1448 : int keyidx, int encr)
1449 : {
1450 : int timeout_ms;
1451 0 : int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1452 : int ctr;
1453 :
1454 0 : if (sm == NULL)
1455 0 : return;
1456 :
1457 0 : __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1458 : keyidx, encr, 0);
1459 :
1460 0 : ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1461 0 : if (ctr == 1 && wpa_auth->conf.tx_status)
1462 0 : timeout_ms = pairwise ? eapol_key_timeout_first :
1463 : eapol_key_timeout_first_group;
1464 : else
1465 0 : timeout_ms = eapol_key_timeout_subseq;
1466 0 : if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1467 0 : sm->pending_1_of_4_timeout = 1;
1468 0 : wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1469 : "counter %d)", timeout_ms, ctr);
1470 0 : eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1471 : wpa_send_eapol_timeout, wpa_auth, sm);
1472 : }
1473 :
1474 :
1475 0 : static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1476 : {
1477 : struct ieee802_1x_hdr *hdr;
1478 : struct wpa_eapol_key *key;
1479 : u16 key_info;
1480 0 : int ret = 0;
1481 : u8 mic[16];
1482 :
1483 0 : if (data_len < sizeof(*hdr) + sizeof(*key))
1484 0 : return -1;
1485 :
1486 0 : hdr = (struct ieee802_1x_hdr *) data;
1487 0 : key = (struct wpa_eapol_key *) (hdr + 1);
1488 0 : key_info = WPA_GET_BE16(key->key_info);
1489 0 : os_memcpy(mic, key->key_mic, 16);
1490 0 : os_memset(key->key_mic, 0, 16);
1491 0 : if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1492 0 : data, data_len, key->key_mic) ||
1493 0 : os_memcmp(mic, key->key_mic, 16) != 0)
1494 0 : ret = -1;
1495 0 : os_memcpy(key->key_mic, mic, 16);
1496 0 : return ret;
1497 : }
1498 :
1499 :
1500 0 : void wpa_remove_ptk(struct wpa_state_machine *sm)
1501 : {
1502 0 : sm->PTK_valid = FALSE;
1503 0 : os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1504 0 : wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1505 0 : sm->pairwise_set = FALSE;
1506 0 : eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1507 0 : }
1508 :
1509 :
1510 0 : int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1511 : {
1512 0 : int remove_ptk = 1;
1513 :
1514 0 : if (sm == NULL)
1515 0 : return -1;
1516 :
1517 0 : wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1518 : "event %d notification", event);
1519 :
1520 0 : switch (event) {
1521 : case WPA_AUTH:
1522 : case WPA_ASSOC:
1523 0 : break;
1524 : case WPA_DEAUTH:
1525 : case WPA_DISASSOC:
1526 0 : sm->DeauthenticationRequest = TRUE;
1527 0 : break;
1528 : case WPA_REAUTH:
1529 : case WPA_REAUTH_EAPOL:
1530 0 : if (!sm->started) {
1531 : /*
1532 : * When using WPS, we may end up here if the STA
1533 : * manages to re-associate without the previous STA
1534 : * entry getting removed. Consequently, we need to make
1535 : * sure that the WPA state machines gets initialized
1536 : * properly at this point.
1537 : */
1538 0 : wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1539 : "started - initialize now");
1540 0 : sm->started = 1;
1541 0 : sm->Init = TRUE;
1542 0 : if (wpa_sm_step(sm) == 1)
1543 0 : return 1; /* should not really happen */
1544 0 : sm->Init = FALSE;
1545 0 : sm->AuthenticationRequest = TRUE;
1546 0 : break;
1547 : }
1548 0 : if (sm->GUpdateStationKeys) {
1549 : /*
1550 : * Reauthentication cancels the pending group key
1551 : * update for this STA.
1552 : */
1553 0 : sm->group->GKeyDoneStations--;
1554 0 : sm->GUpdateStationKeys = FALSE;
1555 0 : sm->PtkGroupInit = TRUE;
1556 : }
1557 0 : sm->ReAuthenticationRequest = TRUE;
1558 0 : break;
1559 : case WPA_ASSOC_FT:
1560 : #ifdef CONFIG_IEEE80211R
1561 0 : wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1562 : "after association");
1563 0 : wpa_ft_install_ptk(sm);
1564 :
1565 : /* Using FT protocol, not WPA auth state machine */
1566 0 : sm->ft_completed = 1;
1567 0 : return 0;
1568 : #else /* CONFIG_IEEE80211R */
1569 : break;
1570 : #endif /* CONFIG_IEEE80211R */
1571 : }
1572 :
1573 : #ifdef CONFIG_IEEE80211R
1574 0 : sm->ft_completed = 0;
1575 : #endif /* CONFIG_IEEE80211R */
1576 :
1577 : #ifdef CONFIG_IEEE80211W
1578 0 : if (sm->mgmt_frame_prot && event == WPA_AUTH)
1579 0 : remove_ptk = 0;
1580 : #endif /* CONFIG_IEEE80211W */
1581 :
1582 0 : if (remove_ptk) {
1583 0 : sm->PTK_valid = FALSE;
1584 0 : os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1585 :
1586 0 : if (event != WPA_REAUTH_EAPOL)
1587 0 : wpa_remove_ptk(sm);
1588 : }
1589 :
1590 0 : return wpa_sm_step(sm);
1591 : }
1592 :
1593 :
1594 0 : SM_STATE(WPA_PTK, INITIALIZE)
1595 : {
1596 0 : SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1597 0 : if (sm->Init) {
1598 : /* Init flag is not cleared here, so avoid busy
1599 : * loop by claiming nothing changed. */
1600 0 : sm->changed = FALSE;
1601 : }
1602 :
1603 0 : sm->keycount = 0;
1604 0 : if (sm->GUpdateStationKeys)
1605 0 : sm->group->GKeyDoneStations--;
1606 0 : sm->GUpdateStationKeys = FALSE;
1607 0 : if (sm->wpa == WPA_VERSION_WPA)
1608 0 : sm->PInitAKeys = FALSE;
1609 : if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1610 : * Local AA > Remote AA)) */) {
1611 0 : sm->Pair = TRUE;
1612 : }
1613 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1614 0 : wpa_remove_ptk(sm);
1615 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1616 0 : sm->TimeoutCtr = 0;
1617 0 : if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1618 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1619 : WPA_EAPOL_authorized, 0);
1620 : }
1621 0 : }
1622 :
1623 :
1624 0 : SM_STATE(WPA_PTK, DISCONNECT)
1625 : {
1626 0 : SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1627 0 : sm->Disconnect = FALSE;
1628 0 : wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1629 0 : }
1630 :
1631 :
1632 0 : SM_STATE(WPA_PTK, DISCONNECTED)
1633 : {
1634 0 : SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1635 0 : sm->DeauthenticationRequest = FALSE;
1636 0 : }
1637 :
1638 :
1639 0 : SM_STATE(WPA_PTK, AUTHENTICATION)
1640 : {
1641 0 : SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1642 0 : os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1643 0 : sm->PTK_valid = FALSE;
1644 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1645 : 1);
1646 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1647 0 : sm->AuthenticationRequest = FALSE;
1648 0 : }
1649 :
1650 :
1651 0 : static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1652 : struct wpa_group *group)
1653 : {
1654 0 : if (group->first_sta_seen)
1655 0 : return;
1656 : /*
1657 : * System has run bit further than at the time hostapd was started
1658 : * potentially very early during boot up. This provides better chances
1659 : * of collecting more randomness on embedded systems. Re-initialize the
1660 : * GMK and Counter here to improve their strength if there was not
1661 : * enough entropy available immediately after system startup.
1662 : */
1663 0 : wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1664 : "station");
1665 : if (random_pool_ready() != 1) {
1666 : wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1667 : "to proceed - reject first 4-way handshake");
1668 : group->reject_4way_hs_for_entropy = TRUE;
1669 : } else {
1670 0 : group->first_sta_seen = TRUE;
1671 0 : group->reject_4way_hs_for_entropy = FALSE;
1672 : }
1673 :
1674 0 : wpa_group_init_gmk_and_counter(wpa_auth, group);
1675 0 : wpa_gtk_update(wpa_auth, group);
1676 0 : wpa_group_config_group_keys(wpa_auth, group);
1677 : }
1678 :
1679 :
1680 0 : SM_STATE(WPA_PTK, AUTHENTICATION2)
1681 : {
1682 0 : SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1683 :
1684 0 : wpa_group_ensure_init(sm->wpa_auth, sm->group);
1685 0 : sm->ReAuthenticationRequest = FALSE;
1686 :
1687 : /*
1688 : * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1689 : * ambiguous. The Authenticator state machine uses a counter that is
1690 : * incremented by one for each 4-way handshake. However, the security
1691 : * analysis of 4-way handshake points out that unpredictable nonces
1692 : * help in preventing precomputation attacks. Instead of the state
1693 : * machine definition, use an unpredictable nonce value here to provide
1694 : * stronger protection against potential precomputation attacks.
1695 : */
1696 0 : if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1697 0 : wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1698 : "ANonce.");
1699 0 : sm->Disconnect = TRUE;
1700 0 : return;
1701 : }
1702 0 : wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1703 : WPA_NONCE_LEN);
1704 : /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1705 : * logical place than INITIALIZE since AUTHENTICATION2 can be
1706 : * re-entered on ReAuthenticationRequest without going through
1707 : * INITIALIZE. */
1708 0 : sm->TimeoutCtr = 0;
1709 : }
1710 :
1711 :
1712 0 : SM_STATE(WPA_PTK, INITPMK)
1713 : {
1714 : u8 msk[2 * PMK_LEN];
1715 0 : size_t len = 2 * PMK_LEN;
1716 :
1717 0 : SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1718 : #ifdef CONFIG_IEEE80211R
1719 0 : sm->xxkey_len = 0;
1720 : #endif /* CONFIG_IEEE80211R */
1721 0 : if (sm->pmksa) {
1722 0 : wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1723 0 : os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1724 0 : } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1725 0 : wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1726 : "(len=%lu)", (unsigned long) len);
1727 0 : os_memcpy(sm->PMK, msk, PMK_LEN);
1728 : #ifdef CONFIG_IEEE80211R
1729 0 : if (len >= 2 * PMK_LEN) {
1730 0 : os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1731 0 : sm->xxkey_len = PMK_LEN;
1732 : }
1733 : #endif /* CONFIG_IEEE80211R */
1734 : } else {
1735 0 : wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1736 : }
1737 :
1738 0 : sm->req_replay_counter_used = 0;
1739 : /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1740 : * will break reauthentication since EAPOL state machines may not be
1741 : * get into AUTHENTICATING state that clears keyRun before WPA state
1742 : * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1743 : * state and takes PMK from the previously used AAA Key. This will
1744 : * eventually fail in 4-Way Handshake because Supplicant uses PMK
1745 : * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1746 : * be good workaround for this issue. */
1747 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1748 0 : }
1749 :
1750 :
1751 0 : SM_STATE(WPA_PTK, INITPSK)
1752 : {
1753 : const u8 *psk;
1754 0 : SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1755 0 : psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1756 0 : if (psk) {
1757 0 : os_memcpy(sm->PMK, psk, PMK_LEN);
1758 : #ifdef CONFIG_IEEE80211R
1759 0 : os_memcpy(sm->xxkey, psk, PMK_LEN);
1760 0 : sm->xxkey_len = PMK_LEN;
1761 : #endif /* CONFIG_IEEE80211R */
1762 : }
1763 0 : sm->req_replay_counter_used = 0;
1764 0 : }
1765 :
1766 :
1767 0 : SM_STATE(WPA_PTK, PTKSTART)
1768 : {
1769 0 : u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1770 0 : size_t pmkid_len = 0;
1771 :
1772 0 : SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1773 0 : sm->PTKRequest = FALSE;
1774 0 : sm->TimeoutEvt = FALSE;
1775 :
1776 0 : sm->TimeoutCtr++;
1777 0 : if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1778 : /* No point in sending the EAPOL-Key - we will disconnect
1779 : * immediately following this. */
1780 0 : return;
1781 : }
1782 :
1783 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1784 : "sending 1/4 msg of 4-Way Handshake");
1785 : /*
1786 : * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1787 : * one possible PSK for this STA.
1788 : */
1789 0 : if (sm->wpa == WPA_VERSION_WPA2 &&
1790 0 : wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
1791 0 : sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
1792 0 : pmkid = buf;
1793 0 : pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1794 0 : pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1795 0 : pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1796 0 : RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1797 0 : if (sm->pmksa)
1798 0 : os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1799 : sm->pmksa->pmkid, PMKID_LEN);
1800 : else {
1801 : /*
1802 : * Calculate PMKID since no PMKSA cache entry was
1803 : * available with pre-calculated PMKID.
1804 : */
1805 0 : rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1806 0 : sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1807 : wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1808 : }
1809 : }
1810 0 : wpa_send_eapol(sm->wpa_auth, sm,
1811 : WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1812 0 : sm->ANonce, pmkid, pmkid_len, 0, 0);
1813 : }
1814 :
1815 :
1816 0 : static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1817 : struct wpa_ptk *ptk)
1818 : {
1819 0 : size_t ptk_len = wpa_cipher_key_len(sm->pairwise) + 32;
1820 : #ifdef CONFIG_IEEE80211R
1821 0 : if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1822 0 : return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1823 : #endif /* CONFIG_IEEE80211R */
1824 :
1825 0 : wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1826 0 : sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1827 : (u8 *) ptk, ptk_len,
1828 : wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1829 :
1830 0 : return 0;
1831 : }
1832 :
1833 :
1834 0 : SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1835 : {
1836 : struct wpa_ptk PTK;
1837 0 : int ok = 0;
1838 0 : const u8 *pmk = NULL;
1839 :
1840 0 : SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1841 0 : sm->EAPOLKeyReceived = FALSE;
1842 0 : sm->update_snonce = FALSE;
1843 :
1844 : /* WPA with IEEE 802.1X: use the derived PMK from EAP
1845 : * WPA-PSK: iterate through possible PSKs and select the one matching
1846 : * the packet */
1847 : for (;;) {
1848 0 : if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1849 0 : pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
1850 0 : sm->p2p_dev_addr, pmk);
1851 0 : if (pmk == NULL)
1852 0 : break;
1853 : } else
1854 0 : pmk = sm->PMK;
1855 :
1856 0 : wpa_derive_ptk(sm, pmk, &PTK);
1857 :
1858 0 : if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1859 : sm->last_rx_eapol_key_len) == 0) {
1860 0 : ok = 1;
1861 0 : break;
1862 : }
1863 :
1864 0 : if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1865 0 : break;
1866 0 : }
1867 :
1868 0 : if (!ok) {
1869 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1870 : "invalid MIC in msg 2/4 of 4-Way Handshake");
1871 0 : return;
1872 : }
1873 :
1874 : #ifdef CONFIG_IEEE80211R
1875 0 : if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1876 : /*
1877 : * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1878 : * with the value we derived.
1879 : */
1880 0 : if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1881 : WPA_PMK_NAME_LEN) != 0) {
1882 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1883 : "PMKR1Name mismatch in FT 4-way "
1884 : "handshake");
1885 0 : wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1886 : "Supplicant",
1887 0 : sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1888 0 : wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1889 0 : sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1890 0 : return;
1891 : }
1892 : }
1893 : #endif /* CONFIG_IEEE80211R */
1894 :
1895 0 : sm->pending_1_of_4_timeout = 0;
1896 0 : eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1897 :
1898 0 : if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1899 : /* PSK may have changed from the previous choice, so update
1900 : * state machine data based on whatever PSK was selected here.
1901 : */
1902 0 : os_memcpy(sm->PMK, pmk, PMK_LEN);
1903 : }
1904 :
1905 0 : sm->MICVerified = TRUE;
1906 :
1907 0 : os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1908 0 : sm->PTK_valid = TRUE;
1909 : }
1910 :
1911 :
1912 0 : SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1913 : {
1914 0 : SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1915 0 : sm->TimeoutCtr = 0;
1916 0 : }
1917 :
1918 :
1919 : #ifdef CONFIG_IEEE80211W
1920 :
1921 0 : static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1922 : {
1923 0 : if (sm->mgmt_frame_prot) {
1924 : size_t len;
1925 0 : len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1926 0 : return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
1927 : }
1928 :
1929 0 : return 0;
1930 : }
1931 :
1932 :
1933 0 : static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1934 : {
1935 : struct wpa_igtk_kde igtk;
1936 0 : struct wpa_group *gsm = sm->group;
1937 : u8 rsc[WPA_KEY_RSC_LEN];
1938 0 : size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1939 :
1940 0 : if (!sm->mgmt_frame_prot)
1941 0 : return pos;
1942 :
1943 0 : igtk.keyid[0] = gsm->GN_igtk;
1944 0 : igtk.keyid[1] = 0;
1945 0 : if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1946 0 : wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
1947 0 : os_memset(igtk.pn, 0, sizeof(igtk.pn));
1948 : else
1949 0 : os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
1950 0 : os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
1951 0 : if (sm->wpa_auth->conf.disable_gtk) {
1952 : /*
1953 : * Provide unique random IGTK to each STA to prevent use of
1954 : * IGTK in the BSS.
1955 : */
1956 0 : if (random_get_bytes(igtk.igtk, len) < 0)
1957 0 : return pos;
1958 : }
1959 0 : pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1960 : (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
1961 : NULL, 0);
1962 :
1963 0 : return pos;
1964 : }
1965 :
1966 : #else /* CONFIG_IEEE80211W */
1967 :
1968 : static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1969 : {
1970 : return 0;
1971 : }
1972 :
1973 :
1974 : static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1975 : {
1976 : return pos;
1977 : }
1978 :
1979 : #endif /* CONFIG_IEEE80211W */
1980 :
1981 :
1982 0 : SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1983 : {
1984 : u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1985 : size_t gtk_len, kde_len;
1986 0 : struct wpa_group *gsm = sm->group;
1987 : u8 *wpa_ie;
1988 0 : int wpa_ie_len, secure, keyidx, encr = 0;
1989 :
1990 0 : SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1991 0 : sm->TimeoutEvt = FALSE;
1992 :
1993 0 : sm->TimeoutCtr++;
1994 0 : if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1995 : /* No point in sending the EAPOL-Key - we will disconnect
1996 : * immediately following this. */
1997 0 : return;
1998 : }
1999 :
2000 : /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2001 : GTK[GN], IGTK, [FTIE], [TIE * 2])
2002 : */
2003 0 : os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2004 0 : wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2005 : /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2006 0 : wpa_ie = sm->wpa_auth->wpa_ie;
2007 0 : wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2008 0 : if (sm->wpa == WPA_VERSION_WPA &&
2009 0 : (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2010 0 : wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2011 : /* WPA-only STA, remove RSN IE */
2012 0 : wpa_ie = wpa_ie + wpa_ie[1] + 2;
2013 0 : wpa_ie_len = wpa_ie[1] + 2;
2014 : }
2015 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2016 : "sending 3/4 msg of 4-Way Handshake");
2017 0 : if (sm->wpa == WPA_VERSION_WPA2) {
2018 : /* WPA2 send GTK in the 4-way handshake */
2019 0 : secure = 1;
2020 0 : gtk = gsm->GTK[gsm->GN - 1];
2021 0 : gtk_len = gsm->GTK_len;
2022 0 : if (sm->wpa_auth->conf.disable_gtk) {
2023 : /*
2024 : * Provide unique random GTK to each STA to prevent use
2025 : * of GTK in the BSS.
2026 : */
2027 0 : if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2028 0 : return;
2029 0 : gtk = dummy_gtk;
2030 : }
2031 0 : keyidx = gsm->GN;
2032 0 : _rsc = rsc;
2033 0 : encr = 1;
2034 : } else {
2035 : /* WPA does not include GTK in msg 3/4 */
2036 0 : secure = 0;
2037 0 : gtk = NULL;
2038 0 : gtk_len = 0;
2039 0 : keyidx = 0;
2040 0 : _rsc = NULL;
2041 0 : if (sm->rx_eapol_key_secure) {
2042 : /*
2043 : * It looks like Windows 7 supplicant tries to use
2044 : * Secure bit in msg 2/4 after having reported Michael
2045 : * MIC failure and it then rejects the 4-way handshake
2046 : * if msg 3/4 does not set Secure bit. Work around this
2047 : * by setting the Secure bit here even in the case of
2048 : * WPA if the supplicant used it first.
2049 : */
2050 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2051 : "STA used Secure bit in WPA msg 2/4 - "
2052 : "set Secure for 3/4 as workaround");
2053 0 : secure = 1;
2054 : }
2055 : }
2056 :
2057 0 : kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2058 0 : if (gtk)
2059 0 : kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2060 : #ifdef CONFIG_IEEE80211R
2061 0 : if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2062 0 : kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2063 0 : kde_len += 300; /* FTIE + 2 * TIE */
2064 : }
2065 : #endif /* CONFIG_IEEE80211R */
2066 : #ifdef CONFIG_P2P
2067 : if (WPA_GET_BE32(sm->ip_addr) > 0)
2068 : kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2069 : #endif /* CONFIG_P2P */
2070 0 : kde = os_malloc(kde_len);
2071 0 : if (kde == NULL)
2072 0 : return;
2073 :
2074 0 : pos = kde;
2075 0 : os_memcpy(pos, wpa_ie, wpa_ie_len);
2076 0 : pos += wpa_ie_len;
2077 : #ifdef CONFIG_IEEE80211R
2078 0 : if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2079 0 : int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
2080 0 : if (res < 0) {
2081 0 : wpa_printf(MSG_ERROR, "FT: Failed to insert "
2082 : "PMKR1Name into RSN IE in EAPOL-Key data");
2083 0 : os_free(kde);
2084 0 : return;
2085 : }
2086 0 : pos += res;
2087 : }
2088 : #endif /* CONFIG_IEEE80211R */
2089 0 : if (gtk) {
2090 : u8 hdr[2];
2091 0 : hdr[0] = keyidx & 0x03;
2092 0 : hdr[1] = 0;
2093 0 : pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2094 : gtk, gtk_len);
2095 : }
2096 0 : pos = ieee80211w_kde_add(sm, pos);
2097 :
2098 : #ifdef CONFIG_IEEE80211R
2099 0 : if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2100 : int res;
2101 : struct wpa_auth_config *conf;
2102 :
2103 0 : conf = &sm->wpa_auth->conf;
2104 0 : res = wpa_write_ftie(conf, conf->r0_key_holder,
2105 : conf->r0_key_holder_len,
2106 0 : NULL, NULL, pos, kde + kde_len - pos,
2107 : NULL, 0);
2108 0 : if (res < 0) {
2109 0 : wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2110 : "into EAPOL-Key Key Data");
2111 0 : os_free(kde);
2112 0 : return;
2113 : }
2114 0 : pos += res;
2115 :
2116 : /* TIE[ReassociationDeadline] (TU) */
2117 0 : *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2118 0 : *pos++ = 5;
2119 0 : *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2120 0 : WPA_PUT_LE32(pos, conf->reassociation_deadline);
2121 0 : pos += 4;
2122 :
2123 : /* TIE[KeyLifetime] (seconds) */
2124 0 : *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2125 0 : *pos++ = 5;
2126 0 : *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2127 0 : WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2128 0 : pos += 4;
2129 : }
2130 : #endif /* CONFIG_IEEE80211R */
2131 : #ifdef CONFIG_P2P
2132 : if (WPA_GET_BE32(sm->ip_addr) > 0) {
2133 : u8 addr[3 * 4];
2134 : os_memcpy(addr, sm->ip_addr, 4);
2135 : os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2136 : os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2137 : pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2138 : addr, sizeof(addr), NULL, 0);
2139 : }
2140 : #endif /* CONFIG_P2P */
2141 :
2142 0 : wpa_send_eapol(sm->wpa_auth, sm,
2143 : (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2144 : WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2145 : WPA_KEY_INFO_KEY_TYPE,
2146 0 : _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2147 0 : os_free(kde);
2148 : }
2149 :
2150 :
2151 0 : SM_STATE(WPA_PTK, PTKINITDONE)
2152 : {
2153 0 : SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2154 0 : sm->EAPOLKeyReceived = FALSE;
2155 0 : if (sm->Pair) {
2156 0 : enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2157 0 : int klen = wpa_cipher_key_len(sm->pairwise);
2158 0 : if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2159 0 : sm->PTK.tk1, klen)) {
2160 0 : wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2161 0 : return;
2162 : }
2163 : /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2164 0 : sm->pairwise_set = TRUE;
2165 :
2166 0 : if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2167 0 : eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2168 0 : eloop_register_timeout(sm->wpa_auth->conf.
2169 : wpa_ptk_rekey, 0, wpa_rekey_ptk,
2170 0 : sm->wpa_auth, sm);
2171 : }
2172 :
2173 0 : if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2174 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2175 : WPA_EAPOL_authorized, 1);
2176 : }
2177 : }
2178 :
2179 : if (0 /* IBSS == TRUE */) {
2180 : sm->keycount++;
2181 : if (sm->keycount == 2) {
2182 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2183 : WPA_EAPOL_portValid, 1);
2184 : }
2185 : } else {
2186 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2187 : 1);
2188 : }
2189 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2190 0 : wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2191 0 : if (sm->wpa == WPA_VERSION_WPA)
2192 0 : sm->PInitAKeys = TRUE;
2193 : else
2194 0 : sm->has_GTK = TRUE;
2195 0 : wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2196 : "pairwise key handshake completed (%s)",
2197 0 : sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2198 :
2199 : #ifdef CONFIG_IEEE80211R
2200 0 : wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2201 : #endif /* CONFIG_IEEE80211R */
2202 : }
2203 :
2204 :
2205 0 : SM_STEP(WPA_PTK)
2206 : {
2207 0 : struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2208 :
2209 0 : if (sm->Init)
2210 0 : SM_ENTER(WPA_PTK, INITIALIZE);
2211 0 : else if (sm->Disconnect
2212 : /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2213 0 : wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2214 : "WPA_PTK: sm->Disconnect");
2215 0 : SM_ENTER(WPA_PTK, DISCONNECT);
2216 : }
2217 0 : else if (sm->DeauthenticationRequest)
2218 0 : SM_ENTER(WPA_PTK, DISCONNECTED);
2219 0 : else if (sm->AuthenticationRequest)
2220 0 : SM_ENTER(WPA_PTK, AUTHENTICATION);
2221 0 : else if (sm->ReAuthenticationRequest)
2222 0 : SM_ENTER(WPA_PTK, AUTHENTICATION2);
2223 0 : else if (sm->PTKRequest)
2224 0 : SM_ENTER(WPA_PTK, PTKSTART);
2225 0 : else switch (sm->wpa_ptk_state) {
2226 : case WPA_PTK_INITIALIZE:
2227 0 : break;
2228 : case WPA_PTK_DISCONNECT:
2229 0 : SM_ENTER(WPA_PTK, DISCONNECTED);
2230 0 : break;
2231 : case WPA_PTK_DISCONNECTED:
2232 0 : SM_ENTER(WPA_PTK, INITIALIZE);
2233 0 : break;
2234 : case WPA_PTK_AUTHENTICATION:
2235 0 : SM_ENTER(WPA_PTK, AUTHENTICATION2);
2236 0 : break;
2237 : case WPA_PTK_AUTHENTICATION2:
2238 0 : if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2239 0 : wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2240 : WPA_EAPOL_keyRun) > 0)
2241 0 : SM_ENTER(WPA_PTK, INITPMK);
2242 0 : else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2243 : /* FIX: && 802.1X::keyRun */)
2244 0 : SM_ENTER(WPA_PTK, INITPSK);
2245 0 : break;
2246 : case WPA_PTK_INITPMK:
2247 0 : if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2248 : WPA_EAPOL_keyAvailable) > 0)
2249 0 : SM_ENTER(WPA_PTK, PTKSTART);
2250 : else {
2251 0 : wpa_auth->dot11RSNA4WayHandshakeFailures++;
2252 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2253 : "INITPMK - keyAvailable = false");
2254 0 : SM_ENTER(WPA_PTK, DISCONNECT);
2255 : }
2256 0 : break;
2257 : case WPA_PTK_INITPSK:
2258 0 : if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2259 : NULL))
2260 0 : SM_ENTER(WPA_PTK, PTKSTART);
2261 : else {
2262 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2263 : "no PSK configured for the STA");
2264 0 : wpa_auth->dot11RSNA4WayHandshakeFailures++;
2265 0 : SM_ENTER(WPA_PTK, DISCONNECT);
2266 : }
2267 0 : break;
2268 : case WPA_PTK_PTKSTART:
2269 0 : if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2270 0 : sm->EAPOLKeyPairwise)
2271 0 : SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2272 0 : else if (sm->TimeoutCtr >
2273 0 : (int) dot11RSNAConfigPairwiseUpdateCount) {
2274 0 : wpa_auth->dot11RSNA4WayHandshakeFailures++;
2275 0 : wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2276 : "PTKSTART: Retry limit %d reached",
2277 : dot11RSNAConfigPairwiseUpdateCount);
2278 0 : SM_ENTER(WPA_PTK, DISCONNECT);
2279 0 : } else if (sm->TimeoutEvt)
2280 0 : SM_ENTER(WPA_PTK, PTKSTART);
2281 0 : break;
2282 : case WPA_PTK_PTKCALCNEGOTIATING:
2283 0 : if (sm->MICVerified)
2284 0 : SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2285 0 : else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2286 0 : sm->EAPOLKeyPairwise)
2287 0 : SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2288 0 : else if (sm->TimeoutEvt)
2289 0 : SM_ENTER(WPA_PTK, PTKSTART);
2290 0 : break;
2291 : case WPA_PTK_PTKCALCNEGOTIATING2:
2292 0 : SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2293 0 : break;
2294 : case WPA_PTK_PTKINITNEGOTIATING:
2295 0 : if (sm->update_snonce)
2296 0 : SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2297 0 : else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2298 0 : sm->EAPOLKeyPairwise && sm->MICVerified)
2299 0 : SM_ENTER(WPA_PTK, PTKINITDONE);
2300 0 : else if (sm->TimeoutCtr >
2301 0 : (int) dot11RSNAConfigPairwiseUpdateCount) {
2302 0 : wpa_auth->dot11RSNA4WayHandshakeFailures++;
2303 0 : wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2304 : "PTKINITNEGOTIATING: Retry limit %d "
2305 : "reached",
2306 : dot11RSNAConfigPairwiseUpdateCount);
2307 0 : SM_ENTER(WPA_PTK, DISCONNECT);
2308 0 : } else if (sm->TimeoutEvt)
2309 0 : SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2310 0 : break;
2311 : case WPA_PTK_PTKINITDONE:
2312 0 : break;
2313 : }
2314 0 : }
2315 :
2316 :
2317 0 : SM_STATE(WPA_PTK_GROUP, IDLE)
2318 : {
2319 0 : SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2320 0 : if (sm->Init) {
2321 : /* Init flag is not cleared here, so avoid busy
2322 : * loop by claiming nothing changed. */
2323 0 : sm->changed = FALSE;
2324 : }
2325 0 : sm->GTimeoutCtr = 0;
2326 0 : }
2327 :
2328 :
2329 0 : SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2330 : {
2331 : u8 rsc[WPA_KEY_RSC_LEN];
2332 0 : struct wpa_group *gsm = sm->group;
2333 : u8 *kde, *pos, hdr[2];
2334 : size_t kde_len;
2335 : u8 *gtk, dummy_gtk[32];
2336 :
2337 0 : SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2338 :
2339 0 : sm->GTimeoutCtr++;
2340 0 : if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2341 : /* No point in sending the EAPOL-Key - we will disconnect
2342 : * immediately following this. */
2343 0 : return;
2344 : }
2345 :
2346 0 : if (sm->wpa == WPA_VERSION_WPA)
2347 0 : sm->PInitAKeys = FALSE;
2348 0 : sm->TimeoutEvt = FALSE;
2349 : /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2350 0 : os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2351 0 : if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2352 0 : wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2353 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2354 : "sending 1/2 msg of Group Key Handshake");
2355 :
2356 0 : gtk = gsm->GTK[gsm->GN - 1];
2357 0 : if (sm->wpa_auth->conf.disable_gtk) {
2358 : /*
2359 : * Provide unique random GTK to each STA to prevent use
2360 : * of GTK in the BSS.
2361 : */
2362 0 : if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2363 0 : return;
2364 0 : gtk = dummy_gtk;
2365 : }
2366 0 : if (sm->wpa == WPA_VERSION_WPA2) {
2367 0 : kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2368 0 : ieee80211w_kde_len(sm);
2369 0 : kde = os_malloc(kde_len);
2370 0 : if (kde == NULL)
2371 0 : return;
2372 :
2373 0 : pos = kde;
2374 0 : hdr[0] = gsm->GN & 0x03;
2375 0 : hdr[1] = 0;
2376 0 : pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2377 0 : gtk, gsm->GTK_len);
2378 0 : pos = ieee80211w_kde_add(sm, pos);
2379 : } else {
2380 0 : kde = gtk;
2381 0 : pos = kde + gsm->GTK_len;
2382 : }
2383 :
2384 0 : wpa_send_eapol(sm->wpa_auth, sm,
2385 : WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2386 : WPA_KEY_INFO_ACK |
2387 0 : (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2388 0 : rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2389 0 : if (sm->wpa == WPA_VERSION_WPA2)
2390 0 : os_free(kde);
2391 : }
2392 :
2393 :
2394 0 : SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2395 : {
2396 0 : SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2397 0 : sm->EAPOLKeyReceived = FALSE;
2398 0 : if (sm->GUpdateStationKeys)
2399 0 : sm->group->GKeyDoneStations--;
2400 0 : sm->GUpdateStationKeys = FALSE;
2401 0 : sm->GTimeoutCtr = 0;
2402 : /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2403 0 : wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2404 : "group key handshake completed (%s)",
2405 0 : sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2406 0 : sm->has_GTK = TRUE;
2407 0 : }
2408 :
2409 :
2410 0 : SM_STATE(WPA_PTK_GROUP, KEYERROR)
2411 : {
2412 0 : SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2413 0 : if (sm->GUpdateStationKeys)
2414 0 : sm->group->GKeyDoneStations--;
2415 0 : sm->GUpdateStationKeys = FALSE;
2416 0 : sm->Disconnect = TRUE;
2417 0 : }
2418 :
2419 :
2420 0 : SM_STEP(WPA_PTK_GROUP)
2421 : {
2422 0 : if (sm->Init || sm->PtkGroupInit) {
2423 0 : SM_ENTER(WPA_PTK_GROUP, IDLE);
2424 0 : sm->PtkGroupInit = FALSE;
2425 0 : } else switch (sm->wpa_ptk_group_state) {
2426 : case WPA_PTK_GROUP_IDLE:
2427 0 : if (sm->GUpdateStationKeys ||
2428 0 : (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2429 0 : SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2430 0 : break;
2431 : case WPA_PTK_GROUP_REKEYNEGOTIATING:
2432 0 : if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2433 0 : !sm->EAPOLKeyPairwise && sm->MICVerified)
2434 0 : SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2435 0 : else if (sm->GTimeoutCtr >
2436 0 : (int) dot11RSNAConfigGroupUpdateCount)
2437 0 : SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2438 0 : else if (sm->TimeoutEvt)
2439 0 : SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2440 0 : break;
2441 : case WPA_PTK_GROUP_KEYERROR:
2442 0 : SM_ENTER(WPA_PTK_GROUP, IDLE);
2443 0 : break;
2444 : case WPA_PTK_GROUP_REKEYESTABLISHED:
2445 0 : SM_ENTER(WPA_PTK_GROUP, IDLE);
2446 0 : break;
2447 : }
2448 0 : }
2449 :
2450 :
2451 0 : static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2452 : struct wpa_group *group)
2453 : {
2454 0 : int ret = 0;
2455 :
2456 0 : os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2457 0 : inc_byte_array(group->Counter, WPA_NONCE_LEN);
2458 0 : if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2459 0 : wpa_auth->addr, group->GNonce,
2460 0 : group->GTK[group->GN - 1], group->GTK_len) < 0)
2461 0 : ret = -1;
2462 0 : wpa_hexdump_key(MSG_DEBUG, "GTK",
2463 0 : group->GTK[group->GN - 1], group->GTK_len);
2464 :
2465 : #ifdef CONFIG_IEEE80211W
2466 0 : if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2467 : size_t len;
2468 0 : len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2469 0 : os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2470 0 : inc_byte_array(group->Counter, WPA_NONCE_LEN);
2471 0 : if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2472 0 : wpa_auth->addr, group->GNonce,
2473 0 : group->IGTK[group->GN_igtk - 4], len) < 0)
2474 0 : ret = -1;
2475 0 : wpa_hexdump_key(MSG_DEBUG, "IGTK",
2476 0 : group->IGTK[group->GN_igtk - 4], len);
2477 : }
2478 : #endif /* CONFIG_IEEE80211W */
2479 :
2480 0 : return ret;
2481 : }
2482 :
2483 :
2484 0 : static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2485 : struct wpa_group *group)
2486 : {
2487 0 : wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2488 : "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2489 0 : group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2490 0 : group->wpa_group_state = WPA_GROUP_GTK_INIT;
2491 :
2492 : /* GTK[0..N] = 0 */
2493 0 : os_memset(group->GTK, 0, sizeof(group->GTK));
2494 0 : group->GN = 1;
2495 0 : group->GM = 2;
2496 : #ifdef CONFIG_IEEE80211W
2497 0 : group->GN_igtk = 4;
2498 0 : group->GM_igtk = 5;
2499 : #endif /* CONFIG_IEEE80211W */
2500 : /* GTK[GN] = CalcGTK() */
2501 0 : wpa_gtk_update(wpa_auth, group);
2502 0 : }
2503 :
2504 :
2505 0 : static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2506 : {
2507 0 : if (ctx != NULL && ctx != sm->group)
2508 0 : return 0;
2509 :
2510 0 : if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2511 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2512 : "Not in PTKINITDONE; skip Group Key update");
2513 0 : sm->GUpdateStationKeys = FALSE;
2514 0 : return 0;
2515 : }
2516 0 : if (sm->GUpdateStationKeys) {
2517 : /*
2518 : * This should not really happen, so add a debug log entry.
2519 : * Since we clear the GKeyDoneStations before the loop, the
2520 : * station needs to be counted here anyway.
2521 : */
2522 0 : wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2523 : "GUpdateStationKeys was already set when "
2524 : "marking station for GTK rekeying");
2525 : }
2526 :
2527 : /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2528 0 : if (sm->is_wnmsleep)
2529 0 : return 0;
2530 :
2531 0 : sm->group->GKeyDoneStations++;
2532 0 : sm->GUpdateStationKeys = TRUE;
2533 :
2534 0 : wpa_sm_step(sm);
2535 0 : return 0;
2536 : }
2537 :
2538 :
2539 : #ifdef CONFIG_WNM
2540 : /* update GTK when exiting WNM-Sleep Mode */
2541 0 : void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2542 : {
2543 0 : if (sm == NULL || sm->is_wnmsleep)
2544 0 : return;
2545 :
2546 0 : wpa_group_update_sta(sm, NULL);
2547 : }
2548 :
2549 :
2550 0 : void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2551 : {
2552 0 : if (sm)
2553 0 : sm->is_wnmsleep = !!flag;
2554 0 : }
2555 :
2556 :
2557 0 : int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2558 : {
2559 0 : struct wpa_group *gsm = sm->group;
2560 0 : u8 *start = pos;
2561 :
2562 : /*
2563 : * GTK subelement:
2564 : * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2565 : * Key[5..32]
2566 : */
2567 0 : *pos++ = WNM_SLEEP_SUBELEM_GTK;
2568 0 : *pos++ = 11 + gsm->GTK_len;
2569 : /* Key ID in B0-B1 of Key Info */
2570 0 : WPA_PUT_LE16(pos, gsm->GN & 0x03);
2571 0 : pos += 2;
2572 0 : *pos++ = gsm->GTK_len;
2573 0 : if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2574 0 : return 0;
2575 0 : pos += 8;
2576 0 : os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2577 0 : pos += gsm->GTK_len;
2578 :
2579 0 : wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2580 : gsm->GN);
2581 0 : wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2582 0 : gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2583 :
2584 0 : return pos - start;
2585 : }
2586 :
2587 :
2588 : #ifdef CONFIG_IEEE80211W
2589 0 : int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2590 : {
2591 0 : struct wpa_group *gsm = sm->group;
2592 0 : u8 *start = pos;
2593 0 : size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2594 :
2595 : /*
2596 : * IGTK subelement:
2597 : * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2598 : */
2599 0 : *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2600 0 : *pos++ = 2 + 6 + len;
2601 0 : WPA_PUT_LE16(pos, gsm->GN_igtk);
2602 0 : pos += 2;
2603 0 : if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2604 0 : return 0;
2605 0 : pos += 6;
2606 :
2607 0 : os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
2608 0 : pos += len;
2609 :
2610 0 : wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2611 : gsm->GN_igtk);
2612 0 : wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2613 0 : gsm->IGTK[gsm->GN_igtk - 4], len);
2614 :
2615 0 : return pos - start;
2616 : }
2617 : #endif /* CONFIG_IEEE80211W */
2618 : #endif /* CONFIG_WNM */
2619 :
2620 :
2621 0 : static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2622 : struct wpa_group *group)
2623 : {
2624 : int tmp;
2625 :
2626 0 : wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2627 : "SETKEYS (VLAN-ID %d)", group->vlan_id);
2628 0 : group->changed = TRUE;
2629 0 : group->wpa_group_state = WPA_GROUP_SETKEYS;
2630 0 : group->GTKReKey = FALSE;
2631 0 : tmp = group->GM;
2632 0 : group->GM = group->GN;
2633 0 : group->GN = tmp;
2634 : #ifdef CONFIG_IEEE80211W
2635 0 : tmp = group->GM_igtk;
2636 0 : group->GM_igtk = group->GN_igtk;
2637 0 : group->GN_igtk = tmp;
2638 : #endif /* CONFIG_IEEE80211W */
2639 : /* "GKeyDoneStations = GNoStations" is done in more robust way by
2640 : * counting the STAs that are marked with GUpdateStationKeys instead of
2641 : * including all STAs that could be in not-yet-completed state. */
2642 0 : wpa_gtk_update(wpa_auth, group);
2643 :
2644 0 : if (group->GKeyDoneStations) {
2645 0 : wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2646 : "GKeyDoneStations=%d when starting new GTK rekey",
2647 : group->GKeyDoneStations);
2648 0 : group->GKeyDoneStations = 0;
2649 : }
2650 0 : wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2651 0 : wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2652 : group->GKeyDoneStations);
2653 0 : }
2654 :
2655 :
2656 0 : static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2657 : struct wpa_group *group)
2658 : {
2659 0 : int ret = 0;
2660 :
2661 0 : if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2662 0 : wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2663 : broadcast_ether_addr, group->GN,
2664 0 : group->GTK[group->GN - 1], group->GTK_len) < 0)
2665 0 : ret = -1;
2666 :
2667 : #ifdef CONFIG_IEEE80211W
2668 0 : if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2669 : enum wpa_alg alg;
2670 : size_t len;
2671 :
2672 0 : alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
2673 0 : len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2674 :
2675 0 : if (ret == 0 &&
2676 0 : wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
2677 : broadcast_ether_addr, group->GN_igtk,
2678 0 : group->IGTK[group->GN_igtk - 4], len) < 0)
2679 0 : ret = -1;
2680 : }
2681 : #endif /* CONFIG_IEEE80211W */
2682 :
2683 0 : return ret;
2684 : }
2685 :
2686 :
2687 0 : static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
2688 : {
2689 0 : if (sm->group == ctx) {
2690 0 : wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
2691 : " for discconnection due to fatal failure",
2692 0 : MAC2STR(sm->addr));
2693 0 : sm->Disconnect = TRUE;
2694 : }
2695 :
2696 0 : return 0;
2697 : }
2698 :
2699 :
2700 0 : static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
2701 : struct wpa_group *group)
2702 : {
2703 0 : wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
2704 0 : group->changed = TRUE;
2705 0 : group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
2706 0 : wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
2707 0 : }
2708 :
2709 :
2710 0 : static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2711 : struct wpa_group *group)
2712 : {
2713 0 : wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2714 : "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2715 0 : group->changed = TRUE;
2716 0 : group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2717 :
2718 0 : if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
2719 0 : wpa_group_fatal_failure(wpa_auth, group);
2720 0 : return -1;
2721 : }
2722 :
2723 0 : return 0;
2724 : }
2725 :
2726 :
2727 0 : static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2728 : struct wpa_group *group)
2729 : {
2730 0 : if (group->GInit) {
2731 0 : wpa_group_gtk_init(wpa_auth, group);
2732 0 : } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
2733 : /* Do not allow group operations */
2734 0 : } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2735 0 : group->GTKAuthenticator) {
2736 0 : wpa_group_setkeysdone(wpa_auth, group);
2737 0 : } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2738 0 : group->GTKReKey) {
2739 0 : wpa_group_setkeys(wpa_auth, group);
2740 0 : } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2741 0 : if (group->GKeyDoneStations == 0)
2742 0 : wpa_group_setkeysdone(wpa_auth, group);
2743 0 : else if (group->GTKReKey)
2744 0 : wpa_group_setkeys(wpa_auth, group);
2745 : }
2746 0 : }
2747 :
2748 :
2749 0 : static int wpa_sm_step(struct wpa_state_machine *sm)
2750 : {
2751 0 : if (sm == NULL)
2752 0 : return 0;
2753 :
2754 0 : if (sm->in_step_loop) {
2755 : /* This should not happen, but if it does, make sure we do not
2756 : * end up freeing the state machine too early by exiting the
2757 : * recursive call. */
2758 0 : wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2759 0 : return 0;
2760 : }
2761 :
2762 0 : sm->in_step_loop = 1;
2763 : do {
2764 0 : if (sm->pending_deinit)
2765 0 : break;
2766 :
2767 0 : sm->changed = FALSE;
2768 0 : sm->wpa_auth->group->changed = FALSE;
2769 :
2770 0 : SM_STEP_RUN(WPA_PTK);
2771 0 : if (sm->pending_deinit)
2772 0 : break;
2773 0 : SM_STEP_RUN(WPA_PTK_GROUP);
2774 0 : if (sm->pending_deinit)
2775 0 : break;
2776 0 : wpa_group_sm_step(sm->wpa_auth, sm->group);
2777 0 : } while (sm->changed || sm->wpa_auth->group->changed);
2778 0 : sm->in_step_loop = 0;
2779 :
2780 0 : if (sm->pending_deinit) {
2781 0 : wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2782 0 : "machine deinit for " MACSTR, MAC2STR(sm->addr));
2783 0 : wpa_free_sta_sm(sm);
2784 0 : return 1;
2785 : }
2786 0 : return 0;
2787 : }
2788 :
2789 :
2790 0 : static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2791 : {
2792 0 : struct wpa_state_machine *sm = eloop_ctx;
2793 0 : wpa_sm_step(sm);
2794 0 : }
2795 :
2796 :
2797 0 : void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2798 : {
2799 0 : if (sm == NULL)
2800 0 : return;
2801 0 : eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2802 : }
2803 :
2804 :
2805 0 : void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2806 : {
2807 : int tmp, i;
2808 : struct wpa_group *group;
2809 :
2810 0 : if (wpa_auth == NULL)
2811 0 : return;
2812 :
2813 0 : group = wpa_auth->group;
2814 :
2815 0 : for (i = 0; i < 2; i++) {
2816 0 : tmp = group->GM;
2817 0 : group->GM = group->GN;
2818 0 : group->GN = tmp;
2819 : #ifdef CONFIG_IEEE80211W
2820 0 : tmp = group->GM_igtk;
2821 0 : group->GM_igtk = group->GN_igtk;
2822 0 : group->GN_igtk = tmp;
2823 : #endif /* CONFIG_IEEE80211W */
2824 0 : wpa_gtk_update(wpa_auth, group);
2825 0 : wpa_group_config_group_keys(wpa_auth, group);
2826 : }
2827 : }
2828 :
2829 :
2830 0 : static const char * wpa_bool_txt(int bool)
2831 : {
2832 0 : return bool ? "TRUE" : "FALSE";
2833 : }
2834 :
2835 :
2836 : #define RSN_SUITE "%02x-%02x-%02x-%d"
2837 : #define RSN_SUITE_ARG(s) \
2838 : ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2839 :
2840 0 : int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2841 : {
2842 0 : int len = 0, ret;
2843 : char pmkid_txt[PMKID_LEN * 2 + 1];
2844 : #ifdef CONFIG_RSN_PREAUTH
2845 0 : const int preauth = 1;
2846 : #else /* CONFIG_RSN_PREAUTH */
2847 : const int preauth = 0;
2848 : #endif /* CONFIG_RSN_PREAUTH */
2849 :
2850 0 : if (wpa_auth == NULL)
2851 0 : return len;
2852 :
2853 0 : ret = os_snprintf(buf + len, buflen - len,
2854 : "dot11RSNAOptionImplemented=TRUE\n"
2855 : "dot11RSNAPreauthenticationImplemented=%s\n"
2856 : "dot11RSNAEnabled=%s\n"
2857 : "dot11RSNAPreauthenticationEnabled=%s\n",
2858 : wpa_bool_txt(preauth),
2859 0 : wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2860 : wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2861 0 : if (ret < 0 || (size_t) ret >= buflen - len)
2862 0 : return len;
2863 0 : len += ret;
2864 :
2865 0 : wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2866 0 : wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2867 :
2868 0 : ret = os_snprintf(
2869 : buf + len, buflen - len,
2870 : "dot11RSNAConfigVersion=%u\n"
2871 : "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2872 : /* FIX: dot11RSNAConfigGroupCipher */
2873 : /* FIX: dot11RSNAConfigGroupRekeyMethod */
2874 : /* FIX: dot11RSNAConfigGroupRekeyTime */
2875 : /* FIX: dot11RSNAConfigGroupRekeyPackets */
2876 : "dot11RSNAConfigGroupRekeyStrict=%u\n"
2877 : "dot11RSNAConfigGroupUpdateCount=%u\n"
2878 : "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2879 : "dot11RSNAConfigGroupCipherSize=%u\n"
2880 : "dot11RSNAConfigPMKLifetime=%u\n"
2881 : "dot11RSNAConfigPMKReauthThreshold=%u\n"
2882 : "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2883 : "dot11RSNAConfigSATimeout=%u\n"
2884 : "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2885 : "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2886 : "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2887 : "dot11RSNAPMKIDUsed=%s\n"
2888 : "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2889 : "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2890 : "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2891 : "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2892 : "dot11RSNA4WayHandshakeFailures=%u\n"
2893 : "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2894 : RSN_VERSION,
2895 0 : !!wpa_auth->conf.wpa_strict_rekey,
2896 : dot11RSNAConfigGroupUpdateCount,
2897 : dot11RSNAConfigPairwiseUpdateCount,
2898 0 : wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2899 : dot11RSNAConfigPMKLifetime,
2900 : dot11RSNAConfigPMKReauthThreshold,
2901 : dot11RSNAConfigSATimeout,
2902 0 : RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2903 0 : RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2904 0 : RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2905 : pmkid_txt,
2906 0 : RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2907 0 : RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2908 0 : RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2909 : wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2910 : wpa_auth->dot11RSNA4WayHandshakeFailures);
2911 0 : if (ret < 0 || (size_t) ret >= buflen - len)
2912 0 : return len;
2913 0 : len += ret;
2914 :
2915 : /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2916 : /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2917 :
2918 : /* Private MIB */
2919 0 : ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2920 0 : wpa_auth->group->wpa_group_state);
2921 0 : if (ret < 0 || (size_t) ret >= buflen - len)
2922 0 : return len;
2923 0 : len += ret;
2924 :
2925 0 : return len;
2926 : }
2927 :
2928 :
2929 0 : int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2930 : {
2931 0 : int len = 0, ret;
2932 0 : u32 pairwise = 0;
2933 :
2934 0 : if (sm == NULL)
2935 0 : return 0;
2936 :
2937 : /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2938 :
2939 : /* dot11RSNAStatsEntry */
2940 :
2941 0 : pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2942 : WPA_PROTO_RSN : WPA_PROTO_WPA,
2943 : sm->pairwise);
2944 0 : if (pairwise == 0)
2945 0 : return 0;
2946 :
2947 0 : ret = os_snprintf(
2948 : buf + len, buflen - len,
2949 : /* TODO: dot11RSNAStatsIndex */
2950 : "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2951 : "dot11RSNAStatsVersion=1\n"
2952 : "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2953 : /* TODO: dot11RSNAStatsTKIPICVErrors */
2954 : "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2955 : "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2956 : /* TODO: dot11RSNAStatsCCMPReplays */
2957 : /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2958 : /* TODO: dot11RSNAStatsTKIPReplays */,
2959 0 : MAC2STR(sm->addr),
2960 0 : RSN_SUITE_ARG(pairwise),
2961 : sm->dot11RSNAStatsTKIPLocalMICFailures,
2962 : sm->dot11RSNAStatsTKIPRemoteMICFailures);
2963 0 : if (ret < 0 || (size_t) ret >= buflen - len)
2964 0 : return len;
2965 0 : len += ret;
2966 :
2967 : /* Private MIB */
2968 0 : ret = os_snprintf(buf + len, buflen - len,
2969 : "hostapdWPAPTKState=%d\n"
2970 : "hostapdWPAPTKGroupState=%d\n",
2971 0 : sm->wpa_ptk_state,
2972 0 : sm->wpa_ptk_group_state);
2973 0 : if (ret < 0 || (size_t) ret >= buflen - len)
2974 0 : return len;
2975 0 : len += ret;
2976 :
2977 0 : return len;
2978 : }
2979 :
2980 :
2981 0 : void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2982 : {
2983 0 : if (wpa_auth)
2984 0 : wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2985 0 : }
2986 :
2987 :
2988 0 : int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2989 : {
2990 0 : return sm && sm->pairwise_set;
2991 : }
2992 :
2993 :
2994 0 : int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2995 : {
2996 0 : return sm->pairwise;
2997 : }
2998 :
2999 :
3000 0 : int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3001 : {
3002 0 : if (sm == NULL)
3003 0 : return -1;
3004 0 : return sm->wpa_key_mgmt;
3005 : }
3006 :
3007 :
3008 0 : int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3009 : {
3010 0 : if (sm == NULL)
3011 0 : return 0;
3012 0 : return sm->wpa;
3013 : }
3014 :
3015 :
3016 0 : int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3017 : struct rsn_pmksa_cache_entry *entry)
3018 : {
3019 0 : if (sm == NULL || sm->pmksa != entry)
3020 0 : return -1;
3021 0 : sm->pmksa = NULL;
3022 0 : return 0;
3023 : }
3024 :
3025 :
3026 : struct rsn_pmksa_cache_entry *
3027 0 : wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3028 : {
3029 0 : return sm ? sm->pmksa : NULL;
3030 : }
3031 :
3032 :
3033 0 : void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3034 : {
3035 0 : if (sm)
3036 0 : sm->dot11RSNAStatsTKIPLocalMICFailures++;
3037 0 : }
3038 :
3039 :
3040 2 : const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3041 : {
3042 2 : if (wpa_auth == NULL)
3043 2 : return NULL;
3044 0 : *len = wpa_auth->wpa_ie_len;
3045 0 : return wpa_auth->wpa_ie;
3046 : }
3047 :
3048 :
3049 0 : int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3050 : int session_timeout, struct eapol_state_machine *eapol)
3051 : {
3052 0 : if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3053 0 : sm->wpa_auth->conf.disable_pmksa_caching)
3054 0 : return -1;
3055 :
3056 0 : if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
3057 0 : sm->wpa_auth->addr, sm->addr, session_timeout,
3058 : eapol, sm->wpa_key_mgmt))
3059 0 : return 0;
3060 :
3061 0 : return -1;
3062 : }
3063 :
3064 :
3065 0 : int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3066 : const u8 *pmk, size_t len, const u8 *sta_addr,
3067 : int session_timeout,
3068 : struct eapol_state_machine *eapol)
3069 : {
3070 0 : if (wpa_auth == NULL)
3071 0 : return -1;
3072 :
3073 0 : if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
3074 : sta_addr, session_timeout, eapol,
3075 : WPA_KEY_MGMT_IEEE8021X))
3076 0 : return 0;
3077 :
3078 0 : return -1;
3079 : }
3080 :
3081 :
3082 0 : void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3083 : const u8 *sta_addr)
3084 : {
3085 : struct rsn_pmksa_cache_entry *pmksa;
3086 :
3087 0 : if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3088 0 : return;
3089 0 : pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3090 0 : if (pmksa) {
3091 0 : wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3092 0 : MACSTR " based on request", MAC2STR(sta_addr));
3093 0 : pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3094 : }
3095 : }
3096 :
3097 :
3098 : static struct wpa_group *
3099 0 : wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3100 : {
3101 : struct wpa_group *group;
3102 :
3103 0 : if (wpa_auth == NULL || wpa_auth->group == NULL)
3104 0 : return NULL;
3105 :
3106 0 : wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3107 : vlan_id);
3108 0 : group = wpa_group_init(wpa_auth, vlan_id, 0);
3109 0 : if (group == NULL)
3110 0 : return NULL;
3111 :
3112 0 : group->next = wpa_auth->group->next;
3113 0 : wpa_auth->group->next = group;
3114 :
3115 0 : return group;
3116 : }
3117 :
3118 :
3119 0 : int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3120 : {
3121 : struct wpa_group *group;
3122 :
3123 0 : if (sm == NULL || sm->wpa_auth == NULL)
3124 0 : return 0;
3125 :
3126 0 : group = sm->wpa_auth->group;
3127 0 : while (group) {
3128 0 : if (group->vlan_id == vlan_id)
3129 0 : break;
3130 0 : group = group->next;
3131 : }
3132 :
3133 0 : if (group == NULL) {
3134 0 : group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3135 0 : if (group == NULL)
3136 0 : return -1;
3137 : }
3138 :
3139 0 : if (sm->group == group)
3140 0 : return 0;
3141 :
3142 0 : if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3143 0 : return -1;
3144 :
3145 0 : wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3146 0 : "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3147 :
3148 0 : sm->group = group;
3149 0 : return 0;
3150 : }
3151 :
3152 :
3153 0 : void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3154 : struct wpa_state_machine *sm, int ack)
3155 : {
3156 0 : if (wpa_auth == NULL || sm == NULL)
3157 0 : return;
3158 0 : wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3159 0 : " ack=%d", MAC2STR(sm->addr), ack);
3160 0 : if (sm->pending_1_of_4_timeout && ack) {
3161 : /*
3162 : * Some deployed supplicant implementations update their SNonce
3163 : * for each EAPOL-Key 2/4 message even within the same 4-way
3164 : * handshake and then fail to use the first SNonce when
3165 : * deriving the PTK. This results in unsuccessful 4-way
3166 : * handshake whenever the relatively short initial timeout is
3167 : * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3168 : * around this by increasing the timeout now that we know that
3169 : * the station has received the frame.
3170 : */
3171 0 : int timeout_ms = eapol_key_timeout_subseq;
3172 0 : wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3173 : "timeout by %u ms because of acknowledged frame",
3174 : timeout_ms);
3175 0 : eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3176 0 : eloop_register_timeout(timeout_ms / 1000,
3177 0 : (timeout_ms % 1000) * 1000,
3178 : wpa_send_eapol_timeout, wpa_auth, sm);
3179 : }
3180 : }
3181 :
3182 :
3183 0 : int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3184 : {
3185 0 : if (sm == NULL)
3186 0 : return 0;
3187 0 : return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3188 : }
3189 :
3190 :
3191 0 : int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3192 : {
3193 0 : if (sm == NULL)
3194 0 : return 0;
3195 0 : return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3196 : }
3197 :
3198 :
3199 : #ifdef CONFIG_P2P
3200 : int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3201 : {
3202 : if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3203 : return -1;
3204 : os_memcpy(addr, sm->ip_addr, 4);
3205 : return 0;
3206 : }
3207 : #endif /* CONFIG_P2P */
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