1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2019, 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 "common/ocv.h"
17 #include "crypto/aes.h"
18 #include "crypto/aes_wrap.h"
19 #include "crypto/aes_siv.h"
20 #include "crypto/crypto.h"
21 #include "crypto/sha1.h"
22 #include "crypto/sha256.h"
23 #include "crypto/sha384.h"
24 #include "crypto/random.h"
25 #include "eapol_auth/eapol_auth_sm.h"
26 #include "drivers/driver.h"
27 #include "ap_config.h"
28 #include "ieee802_11.h"
29 #include "wpa_auth.h"
30 #include "pmksa_cache_auth.h"
31 #include "wpa_auth_i.h"
32 #include "wpa_auth_ie.h"
33
34 #define STATE_MACHINE_DATA struct wpa_state_machine
35 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
36 #define STATE_MACHINE_ADDR sm->addr
37
38
39 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
40 static int wpa_sm_step(struct wpa_state_machine *sm);
41 static int wpa_verify_key_mic(int akmp, size_t pmk_len, struct wpa_ptk *PTK,
42 u8 *data, size_t data_len);
43 #ifdef CONFIG_FILS
44 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
45 u8 *buf, size_t buf_len, u16 *_key_data_len);
46 static struct wpabuf * fils_prepare_plainbuf(struct wpa_state_machine *sm,
47 const struct wpabuf *hlp);
48 #endif /* CONFIG_FILS */
49 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
50 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
51 struct wpa_group *group);
52 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
53 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
54 struct wpa_group *group);
55 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
56 struct wpa_group *group);
57 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
58 const u8 *pmk, unsigned int pmk_len,
59 struct wpa_ptk *ptk);
60 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
61 struct wpa_group *group);
62 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
63 struct wpa_group *group);
64 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
65 struct wpa_group *group);
66 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos);
67
68 static const u32 eapol_key_timeout_first = 100; /* ms */
69 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
70 static const u32 eapol_key_timeout_first_group = 500; /* ms */
71 static const u32 eapol_key_timeout_no_retrans = 4000; /* ms */
72
73 /* TODO: make these configurable */
74 static const int dot11RSNAConfigPMKLifetime = 43200;
75 static const int dot11RSNAConfigPMKReauthThreshold = 70;
76 static const int dot11RSNAConfigSATimeout = 60;
77
78
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)79 static inline int wpa_auth_mic_failure_report(
80 struct wpa_authenticator *wpa_auth, const u8 *addr)
81 {
82 if (wpa_auth->cb->mic_failure_report)
83 return wpa_auth->cb->mic_failure_report(wpa_auth->cb_ctx, addr);
84 return 0;
85 }
86
87
wpa_auth_psk_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)88 static inline void wpa_auth_psk_failure_report(
89 struct wpa_authenticator *wpa_auth, const u8 *addr)
90 {
91 if (wpa_auth->cb->psk_failure_report)
92 wpa_auth->cb->psk_failure_report(wpa_auth->cb_ctx, addr);
93 }
94
95
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)96 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
97 const u8 *addr, wpa_eapol_variable var,
98 int value)
99 {
100 if (wpa_auth->cb->set_eapol)
101 wpa_auth->cb->set_eapol(wpa_auth->cb_ctx, addr, var, value);
102 }
103
104
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)105 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
106 const u8 *addr, wpa_eapol_variable var)
107 {
108 if (wpa_auth->cb->get_eapol == NULL)
109 return -1;
110 return wpa_auth->cb->get_eapol(wpa_auth->cb_ctx, addr, var);
111 }
112
113
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)114 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
115 const u8 *addr,
116 const u8 *p2p_dev_addr,
117 const u8 *prev_psk, size_t *psk_len,
118 int *vlan_id)
119 {
120 if (wpa_auth->cb->get_psk == NULL)
121 return NULL;
122 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
123 prev_psk, psk_len, vlan_id);
124 }
125
126
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)127 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
128 const u8 *addr, u8 *msk, size_t *len)
129 {
130 if (wpa_auth->cb->get_msk == NULL)
131 return -1;
132 return wpa_auth->cb->get_msk(wpa_auth->cb_ctx, addr, msk, len);
133 }
134
135
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)136 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
137 int vlan_id,
138 enum wpa_alg alg, const u8 *addr, int idx,
139 u8 *key, size_t key_len)
140 {
141 if (wpa_auth->cb->set_key == NULL)
142 return -1;
143 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
144 key, key_len);
145 }
146
147
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)148 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
149 const u8 *addr, int idx, u8 *seq)
150 {
151 if (wpa_auth->cb->get_seqnum == NULL)
152 return -1;
153 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
154 }
155
156
157 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)158 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
159 const u8 *data, size_t data_len, int encrypt)
160 {
161 if (wpa_auth->cb->send_eapol == NULL)
162 return -1;
163 return wpa_auth->cb->send_eapol(wpa_auth->cb_ctx, addr, data, data_len,
164 encrypt);
165 }
166
167
168 #ifdef CONFIG_MESH
wpa_auth_start_ampe(struct wpa_authenticator * wpa_auth,const u8 * addr)169 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
170 const u8 *addr)
171 {
172 if (wpa_auth->cb->start_ampe == NULL)
173 return -1;
174 return wpa_auth->cb->start_ampe(wpa_auth->cb_ctx, addr);
175 }
176 #endif /* CONFIG_MESH */
177
178
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)179 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
180 int (*cb)(struct wpa_state_machine *sm, void *ctx),
181 void *cb_ctx)
182 {
183 if (wpa_auth->cb->for_each_sta == NULL)
184 return 0;
185 return wpa_auth->cb->for_each_sta(wpa_auth->cb_ctx, cb, cb_ctx);
186 }
187
188
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)189 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
190 int (*cb)(struct wpa_authenticator *a, void *ctx),
191 void *cb_ctx)
192 {
193 if (wpa_auth->cb->for_each_auth == NULL)
194 return 0;
195 return wpa_auth->cb->for_each_auth(wpa_auth->cb_ctx, cb, cb_ctx);
196 }
197
198
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)199 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
200 logger_level level, const char *txt)
201 {
202 if (wpa_auth->cb->logger == NULL)
203 return;
204 wpa_auth->cb->logger(wpa_auth->cb_ctx, addr, level, txt);
205 }
206
207
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)208 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
209 logger_level level, const char *fmt, ...)
210 {
211 char *format;
212 int maxlen;
213 va_list ap;
214
215 if (wpa_auth->cb->logger == NULL)
216 return;
217
218 maxlen = os_strlen(fmt) + 100;
219 format = os_malloc(maxlen);
220 if (!format)
221 return;
222
223 va_start(ap, fmt);
224 vsnprintf(format, maxlen, fmt, ap);
225 va_end(ap);
226
227 wpa_auth_logger(wpa_auth, addr, level, format);
228
229 os_free(format);
230 }
231
232
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr,u16 reason)233 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
234 const u8 *addr, u16 reason)
235 {
236 if (wpa_auth->cb->disconnect == NULL)
237 return;
238 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR " (reason %u)",
239 MAC2STR(addr), reason);
240 wpa_auth->cb->disconnect(wpa_auth->cb_ctx, addr, reason);
241 }
242
243
244 #ifdef CONFIG_OCV
wpa_channel_info(struct wpa_authenticator * wpa_auth,struct wpa_channel_info * ci)245 static int wpa_channel_info(struct wpa_authenticator *wpa_auth,
246 struct wpa_channel_info *ci)
247 {
248 if (!wpa_auth->cb->channel_info)
249 return -1;
250 return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci);
251 }
252 #endif /* CONFIG_OCV */
253
254
wpa_auth_update_vlan(struct wpa_authenticator * wpa_auth,const u8 * addr,int vlan_id)255 static int wpa_auth_update_vlan(struct wpa_authenticator *wpa_auth,
256 const u8 *addr, int vlan_id)
257 {
258 if (!wpa_auth->cb->update_vlan)
259 return -1;
260 return wpa_auth->cb->update_vlan(wpa_auth->cb_ctx, addr, vlan_id);
261 }
262
263
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)264 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
265 {
266 struct wpa_authenticator *wpa_auth = eloop_ctx;
267
268 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
269 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
270 "initialization.");
271 } else {
272 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
273 wpa_hexdump_key(MSG_DEBUG, "GMK",
274 wpa_auth->group->GMK, WPA_GMK_LEN);
275 }
276
277 if (wpa_auth->conf.wpa_gmk_rekey) {
278 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
279 wpa_rekey_gmk, wpa_auth, NULL);
280 }
281 }
282
283
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)284 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
285 {
286 struct wpa_authenticator *wpa_auth = eloop_ctx;
287 struct wpa_group *group, *next;
288
289 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
290 group = wpa_auth->group;
291 while (group) {
292 wpa_group_get(wpa_auth, group);
293
294 group->GTKReKey = TRUE;
295 do {
296 group->changed = FALSE;
297 wpa_group_sm_step(wpa_auth, group);
298 } while (group->changed);
299
300 next = group->next;
301 wpa_group_put(wpa_auth, group);
302 group = next;
303 }
304
305 if (wpa_auth->conf.wpa_group_rekey) {
306 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
307 0, wpa_rekey_gtk, wpa_auth, NULL);
308 }
309 }
310
311
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)312 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
313 {
314 struct wpa_authenticator *wpa_auth = eloop_ctx;
315 struct wpa_state_machine *sm = timeout_ctx;
316
317 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
318 wpa_request_new_ptk(sm);
319 wpa_sm_step(sm);
320 }
321
322
wpa_auth_set_ptk_rekey_timer(struct wpa_state_machine * sm)323 void wpa_auth_set_ptk_rekey_timer(struct wpa_state_machine *sm)
324 {
325 if (sm && sm->wpa_auth->conf.wpa_ptk_rekey) {
326 wpa_printf(MSG_DEBUG, "WPA: Start PTK rekeying timer for "
327 MACSTR " (%d seconds)", MAC2STR(sm->addr),
328 sm->wpa_auth->conf.wpa_ptk_rekey);
329 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
330 eloop_register_timeout(sm->wpa_auth->conf.wpa_ptk_rekey, 0,
331 wpa_rekey_ptk, sm->wpa_auth, sm);
332 }
333 }
334
335
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)336 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
337 {
338 if (sm->pmksa == ctx)
339 sm->pmksa = NULL;
340 return 0;
341 }
342
343
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)344 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
345 void *ctx)
346 {
347 struct wpa_authenticator *wpa_auth = ctx;
348 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
349 }
350
351
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)352 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
353 struct wpa_group *group)
354 {
355 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
356 u8 rkey[32];
357 unsigned long ptr;
358
359 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
360 return -1;
361 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
362
363 /*
364 * Counter = PRF-256(Random number, "Init Counter",
365 * Local MAC Address || Time)
366 */
367 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
368 wpa_get_ntp_timestamp(buf + ETH_ALEN);
369 ptr = (unsigned long) group;
370 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
371 #ifdef TEST_FUZZ
372 os_memset(buf + ETH_ALEN, 0xab, 8);
373 os_memset(buf + ETH_ALEN + 8, 0xcd, sizeof(ptr));
374 #endif /* TEST_FUZZ */
375 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
376 return -1;
377
378 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
379 group->Counter, WPA_NONCE_LEN) < 0)
380 return -1;
381 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
382 group->Counter, WPA_NONCE_LEN);
383
384 return 0;
385 }
386
387
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)388 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
389 int vlan_id, int delay_init)
390 {
391 struct wpa_group *group;
392
393 group = os_zalloc(sizeof(struct wpa_group));
394 if (group == NULL)
395 return NULL;
396
397 group->GTKAuthenticator = TRUE;
398 group->vlan_id = vlan_id;
399 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
400
401 if (random_pool_ready() != 1) {
402 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
403 "for secure operations - update keys later when "
404 "the first station connects");
405 }
406
407 /*
408 * Set initial GMK/Counter value here. The actual values that will be
409 * used in negotiations will be set once the first station tries to
410 * connect. This allows more time for collecting additional randomness
411 * on embedded devices.
412 */
413 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
414 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
415 "initialization.");
416 os_free(group);
417 return NULL;
418 }
419
420 group->GInit = TRUE;
421 if (delay_init) {
422 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
423 "until Beacon frames have been configured");
424 /* Initialization is completed in wpa_init_keys(). */
425 } else {
426 wpa_group_sm_step(wpa_auth, group);
427 group->GInit = FALSE;
428 wpa_group_sm_step(wpa_auth, group);
429 }
430
431 return group;
432 }
433
434
435 /**
436 * wpa_init - Initialize WPA authenticator
437 * @addr: Authenticator address
438 * @conf: Configuration for WPA authenticator
439 * @cb: Callback functions for WPA authenticator
440 * Returns: Pointer to WPA authenticator data or %NULL on failure
441 */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,const struct wpa_auth_callbacks * cb,void * cb_ctx)442 struct wpa_authenticator * wpa_init(const u8 *addr,
443 struct wpa_auth_config *conf,
444 const struct wpa_auth_callbacks *cb,
445 void *cb_ctx)
446 {
447 struct wpa_authenticator *wpa_auth;
448
449 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
450 if (wpa_auth == NULL)
451 return NULL;
452 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
453 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
454 wpa_auth->cb = cb;
455 wpa_auth->cb_ctx = cb_ctx;
456
457 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
458 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
459 os_free(wpa_auth);
460 return NULL;
461 }
462
463 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
464 if (wpa_auth->group == NULL) {
465 os_free(wpa_auth->wpa_ie);
466 os_free(wpa_auth);
467 return NULL;
468 }
469
470 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
471 wpa_auth);
472 if (wpa_auth->pmksa == NULL) {
473 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
474 os_free(wpa_auth->group);
475 os_free(wpa_auth->wpa_ie);
476 os_free(wpa_auth);
477 return NULL;
478 }
479
480 #ifdef CONFIG_IEEE80211R_AP
481 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
482 if (wpa_auth->ft_pmk_cache == NULL) {
483 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
484 os_free(wpa_auth->group);
485 os_free(wpa_auth->wpa_ie);
486 pmksa_cache_auth_deinit(wpa_auth->pmksa);
487 os_free(wpa_auth);
488 return NULL;
489 }
490 #endif /* CONFIG_IEEE80211R_AP */
491
492 if (wpa_auth->conf.wpa_gmk_rekey) {
493 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
494 wpa_rekey_gmk, wpa_auth, NULL);
495 }
496
497 if (wpa_auth->conf.wpa_group_rekey) {
498 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
499 wpa_rekey_gtk, wpa_auth, NULL);
500 }
501
502 #ifdef CONFIG_P2P
503 if (WPA_GET_BE32(conf->ip_addr_start)) {
504 int count = WPA_GET_BE32(conf->ip_addr_end) -
505 WPA_GET_BE32(conf->ip_addr_start) + 1;
506 if (count > 1000)
507 count = 1000;
508 if (count > 0)
509 wpa_auth->ip_pool = bitfield_alloc(count);
510 }
511 #endif /* CONFIG_P2P */
512
513 return wpa_auth;
514 }
515
516
wpa_init_keys(struct wpa_authenticator * wpa_auth)517 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
518 {
519 struct wpa_group *group = wpa_auth->group;
520
521 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
522 "keys");
523 wpa_group_sm_step(wpa_auth, group);
524 group->GInit = FALSE;
525 wpa_group_sm_step(wpa_auth, group);
526 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
527 return -1;
528 return 0;
529 }
530
531
532 /**
533 * wpa_deinit - Deinitialize WPA authenticator
534 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
535 */
wpa_deinit(struct wpa_authenticator * wpa_auth)536 void wpa_deinit(struct wpa_authenticator *wpa_auth)
537 {
538 struct wpa_group *group, *prev;
539
540 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
541 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
542
543 pmksa_cache_auth_deinit(wpa_auth->pmksa);
544
545 #ifdef CONFIG_IEEE80211R_AP
546 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
547 wpa_auth->ft_pmk_cache = NULL;
548 wpa_ft_deinit(wpa_auth);
549 #endif /* CONFIG_IEEE80211R_AP */
550
551 #ifdef CONFIG_P2P
552 bitfield_free(wpa_auth->ip_pool);
553 #endif /* CONFIG_P2P */
554
555
556 os_free(wpa_auth->wpa_ie);
557
558 group = wpa_auth->group;
559 while (group) {
560 prev = group;
561 group = group->next;
562 os_free(prev);
563 }
564
565 os_free(wpa_auth);
566 }
567
568
569 /**
570 * wpa_reconfig - Update WPA authenticator configuration
571 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
572 * @conf: Configuration for WPA authenticator
573 */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)574 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
575 struct wpa_auth_config *conf)
576 {
577 struct wpa_group *group;
578 if (wpa_auth == NULL)
579 return 0;
580
581 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
582 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
583 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
584 return -1;
585 }
586
587 /*
588 * Reinitialize GTK to make sure it is suitable for the new
589 * configuration.
590 */
591 group = wpa_auth->group;
592 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
593 group->GInit = TRUE;
594 wpa_group_sm_step(wpa_auth, group);
595 group->GInit = FALSE;
596 wpa_group_sm_step(wpa_auth, group);
597
598 return 0;
599 }
600
601
602 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr)603 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
604 const u8 *p2p_dev_addr)
605 {
606 struct wpa_state_machine *sm;
607
608 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
609 return NULL;
610
611 sm = os_zalloc(sizeof(struct wpa_state_machine));
612 if (sm == NULL)
613 return NULL;
614 os_memcpy(sm->addr, addr, ETH_ALEN);
615 if (p2p_dev_addr)
616 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
617
618 sm->wpa_auth = wpa_auth;
619 sm->group = wpa_auth->group;
620 wpa_group_get(sm->wpa_auth, sm->group);
621
622 return sm;
623 }
624
625
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)626 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
627 struct wpa_state_machine *sm)
628 {
629 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
630 return -1;
631
632 #ifdef CONFIG_IEEE80211R_AP
633 if (sm->ft_completed) {
634 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
635 "FT authentication already completed - do not "
636 "start 4-way handshake");
637 /* Go to PTKINITDONE state to allow GTK rekeying */
638 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
639 sm->Pair = TRUE;
640 return 0;
641 }
642 #endif /* CONFIG_IEEE80211R_AP */
643
644 #ifdef CONFIG_FILS
645 if (sm->fils_completed) {
646 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
647 "FILS authentication already completed - do not start 4-way handshake");
648 /* Go to PTKINITDONE state to allow GTK rekeying */
649 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
650 sm->Pair = TRUE;
651 return 0;
652 }
653 #endif /* CONFIG_FILS */
654
655 if (sm->started) {
656 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
657 sm->ReAuthenticationRequest = TRUE;
658 return wpa_sm_step(sm);
659 }
660
661 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
662 "start authentication");
663 sm->started = 1;
664
665 sm->Init = TRUE;
666 if (wpa_sm_step(sm) == 1)
667 return 1; /* should not really happen */
668 sm->Init = FALSE;
669 sm->AuthenticationRequest = TRUE;
670 return wpa_sm_step(sm);
671 }
672
673
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)674 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
675 {
676 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
677 * reassociates back to the same AP while the previous entry for the
678 * STA has not yet been removed. */
679 if (sm == NULL)
680 return;
681
682 sm->wpa_key_mgmt = 0;
683 }
684
685
wpa_free_sta_sm(struct wpa_state_machine * sm)686 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
687 {
688 #ifdef CONFIG_P2P
689 if (WPA_GET_BE32(sm->ip_addr)) {
690 u32 start;
691 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
692 "address %u.%u.%u.%u from " MACSTR,
693 sm->ip_addr[0], sm->ip_addr[1],
694 sm->ip_addr[2], sm->ip_addr[3],
695 MAC2STR(sm->addr));
696 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
697 bitfield_clear(sm->wpa_auth->ip_pool,
698 WPA_GET_BE32(sm->ip_addr) - start);
699 }
700 #endif /* CONFIG_P2P */
701 if (sm->GUpdateStationKeys) {
702 sm->group->GKeyDoneStations--;
703 sm->GUpdateStationKeys = FALSE;
704 }
705 #ifdef CONFIG_IEEE80211R_AP
706 os_free(sm->assoc_resp_ftie);
707 wpabuf_free(sm->ft_pending_req_ies);
708 #endif /* CONFIG_IEEE80211R_AP */
709 os_free(sm->last_rx_eapol_key);
710 os_free(sm->wpa_ie);
711 wpa_group_put(sm->wpa_auth, sm->group);
712 #ifdef CONFIG_DPP2
713 wpabuf_clear_free(sm->dpp_z);
714 #endif /* CONFIG_DPP2 */
715 bin_clear_free(sm, sizeof(*sm));
716 }
717
718
wpa_auth_sta_deinit(struct wpa_state_machine * sm)719 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
720 {
721 if (sm == NULL)
722 return;
723
724 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
725 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
726 "strict rekeying - force GTK rekey since STA "
727 "is leaving");
728 if (eloop_deplete_timeout(0, 500000, wpa_rekey_gtk,
729 sm->wpa_auth, NULL) == -1)
730 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
731 NULL);
732 }
733
734 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
735 sm->pending_1_of_4_timeout = 0;
736 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
737 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
738 #ifdef CONFIG_IEEE80211R_AP
739 wpa_ft_sta_deinit(sm);
740 #endif /* CONFIG_IEEE80211R_AP */
741 if (sm->in_step_loop) {
742 /* Must not free state machine while wpa_sm_step() is running.
743 * Freeing will be completed in the end of wpa_sm_step(). */
744 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
745 "machine deinit for " MACSTR, MAC2STR(sm->addr));
746 sm->pending_deinit = 1;
747 } else
748 wpa_free_sta_sm(sm);
749 }
750
751
wpa_request_new_ptk(struct wpa_state_machine * sm)752 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
753 {
754 if (sm == NULL)
755 return;
756
757 sm->PTKRequest = TRUE;
758 sm->PTK_valid = 0;
759 }
760
761
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)762 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
763 const u8 *replay_counter)
764 {
765 int i;
766 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
767 if (!ctr[i].valid)
768 break;
769 if (os_memcmp(replay_counter, ctr[i].counter,
770 WPA_REPLAY_COUNTER_LEN) == 0)
771 return 1;
772 }
773 return 0;
774 }
775
776
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)777 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
778 const u8 *replay_counter)
779 {
780 int i;
781 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
782 if (ctr[i].valid &&
783 (replay_counter == NULL ||
784 os_memcmp(replay_counter, ctr[i].counter,
785 WPA_REPLAY_COUNTER_LEN) == 0))
786 ctr[i].valid = FALSE;
787 }
788 }
789
790
791 #ifdef CONFIG_IEEE80211R_AP
ft_check_msg_2_of_4(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,struct wpa_eapol_ie_parse * kde)792 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
793 struct wpa_state_machine *sm,
794 struct wpa_eapol_ie_parse *kde)
795 {
796 struct wpa_ie_data ie;
797 struct rsn_mdie *mdie;
798
799 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
800 ie.num_pmkid != 1 || ie.pmkid == NULL) {
801 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
802 "FT 4-way handshake message 2/4");
803 return -1;
804 }
805
806 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
807 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
808 sm->sup_pmk_r1_name, PMKID_LEN);
809
810 if (!kde->mdie || !kde->ftie) {
811 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
812 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
813 return -1;
814 }
815
816 mdie = (struct rsn_mdie *) (kde->mdie + 2);
817 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
818 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
819 MOBILITY_DOMAIN_ID_LEN) != 0) {
820 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
821 return -1;
822 }
823
824 if (sm->assoc_resp_ftie &&
825 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
826 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
827 2 + sm->assoc_resp_ftie[1]) != 0)) {
828 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
829 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
830 kde->ftie, kde->ftie_len);
831 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
832 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
833 return -1;
834 }
835
836 return 0;
837 }
838 #endif /* CONFIG_IEEE80211R_AP */
839
840
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)841 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
842 struct wpa_state_machine *sm, int group)
843 {
844 /* Supplicant reported a Michael MIC error */
845 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
846 "received EAPOL-Key Error Request "
847 "(STA detected Michael MIC failure (group=%d))",
848 group);
849
850 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
851 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
852 "ignore Michael MIC failure report since "
853 "group cipher is not TKIP");
854 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
855 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
856 "ignore Michael MIC failure report since "
857 "pairwise cipher is not TKIP");
858 } else {
859 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
860 return 1; /* STA entry was removed */
861 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
862 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
863 }
864
865 /*
866 * Error report is not a request for a new key handshake, but since
867 * Authenticator may do it, let's change the keys now anyway.
868 */
869 wpa_request_new_ptk(sm);
870 return 0;
871 }
872
873
wpa_try_alt_snonce(struct wpa_state_machine * sm,u8 * data,size_t data_len)874 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
875 size_t data_len)
876 {
877 struct wpa_ptk PTK;
878 int ok = 0;
879 const u8 *pmk = NULL;
880 size_t pmk_len;
881 int vlan_id = 0;
882
883 os_memset(&PTK, 0, sizeof(PTK));
884 for (;;) {
885 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
886 !wpa_key_mgmt_sae(sm->wpa_key_mgmt)) {
887 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
888 sm->p2p_dev_addr, pmk, &pmk_len,
889 &vlan_id);
890 if (pmk == NULL)
891 break;
892 #ifdef CONFIG_IEEE80211R_AP
893 if (wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
894 os_memcpy(sm->xxkey, pmk, pmk_len);
895 sm->xxkey_len = pmk_len;
896 }
897 #endif /* CONFIG_IEEE80211R_AP */
898 } else {
899 pmk = sm->PMK;
900 pmk_len = sm->pmk_len;
901 }
902
903 if (wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK) < 0)
904 break;
905
906 if (wpa_verify_key_mic(sm->wpa_key_mgmt, pmk_len, &PTK,
907 data, data_len) == 0) {
908 if (sm->PMK != pmk) {
909 os_memcpy(sm->PMK, pmk, pmk_len);
910 sm->pmk_len = pmk_len;
911 }
912 ok = 1;
913 break;
914 }
915
916 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
917 wpa_key_mgmt_sae(sm->wpa_key_mgmt))
918 break;
919 }
920
921 if (!ok) {
922 wpa_printf(MSG_DEBUG,
923 "WPA: Earlier SNonce did not result in matching MIC");
924 return -1;
925 }
926
927 wpa_printf(MSG_DEBUG,
928 "WPA: Earlier SNonce resulted in matching MIC");
929 sm->alt_snonce_valid = 0;
930
931 if (vlan_id && wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
932 wpa_auth_update_vlan(sm->wpa_auth, sm->addr, vlan_id) < 0)
933 return -1;
934
935 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
936 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
937 forced_memzero(&PTK, sizeof(PTK));
938 sm->PTK_valid = TRUE;
939
940 return 0;
941 }
942
943
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)944 void wpa_receive(struct wpa_authenticator *wpa_auth,
945 struct wpa_state_machine *sm,
946 u8 *data, size_t data_len)
947 {
948 struct ieee802_1x_hdr *hdr;
949 struct wpa_eapol_key *key;
950 u16 key_info, key_data_length;
951 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST } msg;
952 char *msgtxt;
953 struct wpa_eapol_ie_parse kde;
954 const u8 *key_data;
955 size_t keyhdrlen, mic_len;
956 u8 *mic;
957
958 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
959 return;
960 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
961
962 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
963 keyhdrlen = sizeof(*key) + mic_len + 2;
964
965 if (data_len < sizeof(*hdr) + keyhdrlen) {
966 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
967 return;
968 }
969
970 hdr = (struct ieee802_1x_hdr *) data;
971 key = (struct wpa_eapol_key *) (hdr + 1);
972 mic = (u8 *) (key + 1);
973 key_info = WPA_GET_BE16(key->key_info);
974 key_data = mic + mic_len + 2;
975 key_data_length = WPA_GET_BE16(mic + mic_len);
976 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
977 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
978 MAC2STR(sm->addr), key_info, key->type,
979 (unsigned int) mic_len, key_data_length);
980 wpa_hexdump(MSG_MSGDUMP,
981 "WPA: EAPOL-Key header (ending before Key MIC)",
982 key, sizeof(*key));
983 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
984 mic, mic_len);
985 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
986 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
987 "key_data overflow (%d > %lu)",
988 key_data_length,
989 (unsigned long) (data_len - sizeof(*hdr) -
990 keyhdrlen));
991 return;
992 }
993
994 if (sm->wpa == WPA_VERSION_WPA2) {
995 if (key->type == EAPOL_KEY_TYPE_WPA) {
996 /*
997 * Some deployed station implementations seem to send
998 * msg 4/4 with incorrect type value in WPA2 mode.
999 */
1000 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
1001 "with unexpected WPA type in RSN mode");
1002 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
1003 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
1004 "unexpected type %d in RSN mode",
1005 key->type);
1006 return;
1007 }
1008 } else {
1009 if (key->type != EAPOL_KEY_TYPE_WPA) {
1010 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
1011 "unexpected type %d in WPA mode",
1012 key->type);
1013 return;
1014 }
1015 }
1016
1017 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
1018 WPA_NONCE_LEN);
1019 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
1020 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1021
1022 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
1023 * are set */
1024
1025 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1026 wpa_printf(MSG_DEBUG, "WPA: Ignore SMK message");
1027 return;
1028 }
1029
1030 if (key_info & WPA_KEY_INFO_REQUEST) {
1031 msg = REQUEST;
1032 msgtxt = "Request";
1033 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1034 msg = GROUP_2;
1035 msgtxt = "2/2 Group";
1036 } else if (key_data_length == 0 ||
1037 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
1038 key_data_length == AES_BLOCK_SIZE)) {
1039 msg = PAIRWISE_4;
1040 msgtxt = "4/4 Pairwise";
1041 } else {
1042 msg = PAIRWISE_2;
1043 msgtxt = "2/4 Pairwise";
1044 }
1045
1046 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
1047 msg == GROUP_2) {
1048 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1049 if (sm->pairwise == WPA_CIPHER_CCMP ||
1050 sm->pairwise == WPA_CIPHER_GCMP) {
1051 if (wpa_use_cmac(sm->wpa_key_mgmt) &&
1052 !wpa_use_akm_defined(sm->wpa_key_mgmt) &&
1053 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1054 wpa_auth_logger(wpa_auth, sm->addr,
1055 LOGGER_WARNING,
1056 "advertised support for "
1057 "AES-128-CMAC, but did not "
1058 "use it");
1059 return;
1060 }
1061
1062 if (!wpa_use_cmac(sm->wpa_key_mgmt) &&
1063 !wpa_use_akm_defined(sm->wpa_key_mgmt) &&
1064 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1065 wpa_auth_logger(wpa_auth, sm->addr,
1066 LOGGER_WARNING,
1067 "did not use HMAC-SHA1-AES "
1068 "with CCMP/GCMP");
1069 return;
1070 }
1071 }
1072
1073 if (wpa_use_akm_defined(sm->wpa_key_mgmt) &&
1074 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1075 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1076 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1077 return;
1078 }
1079 }
1080
1081 if (key_info & WPA_KEY_INFO_REQUEST) {
1082 if (sm->req_replay_counter_used &&
1083 os_memcmp(key->replay_counter, sm->req_replay_counter,
1084 WPA_REPLAY_COUNTER_LEN) <= 0) {
1085 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1086 "received EAPOL-Key request with "
1087 "replayed counter");
1088 return;
1089 }
1090 }
1091
1092 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1093 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1094 int i;
1095
1096 if (msg == PAIRWISE_2 &&
1097 wpa_replay_counter_valid(sm->prev_key_replay,
1098 key->replay_counter) &&
1099 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1100 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1101 {
1102 /*
1103 * Some supplicant implementations (e.g., Windows XP
1104 * WZC) update SNonce for each EAPOL-Key 2/4. This
1105 * breaks the workaround on accepting any of the
1106 * pending requests, so allow the SNonce to be updated
1107 * even if we have already sent out EAPOL-Key 3/4.
1108 */
1109 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1110 "Process SNonce update from STA "
1111 "based on retransmitted EAPOL-Key "
1112 "1/4");
1113 sm->update_snonce = 1;
1114 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1115 sm->alt_snonce_valid = TRUE;
1116 os_memcpy(sm->alt_replay_counter,
1117 sm->key_replay[0].counter,
1118 WPA_REPLAY_COUNTER_LEN);
1119 goto continue_processing;
1120 }
1121
1122 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1123 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1124 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1125 WPA_REPLAY_COUNTER_LEN) == 0) {
1126 /*
1127 * Supplicant may still be using the old SNonce since
1128 * there was two EAPOL-Key 2/4 messages and they had
1129 * different SNonce values.
1130 */
1131 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1132 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1133 goto continue_processing;
1134 }
1135
1136 if (msg == PAIRWISE_2 &&
1137 wpa_replay_counter_valid(sm->prev_key_replay,
1138 key->replay_counter) &&
1139 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1140 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1141 "ignore retransmitted EAPOL-Key %s - "
1142 "SNonce did not change", msgtxt);
1143 } else {
1144 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1145 "received EAPOL-Key %s with "
1146 "unexpected replay counter", msgtxt);
1147 }
1148 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1149 if (!sm->key_replay[i].valid)
1150 break;
1151 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1152 sm->key_replay[i].counter,
1153 WPA_REPLAY_COUNTER_LEN);
1154 }
1155 wpa_hexdump(MSG_DEBUG, "received replay counter",
1156 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1157 return;
1158 }
1159
1160 continue_processing:
1161 #ifdef CONFIG_FILS
1162 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1163 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1164 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1165 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1166 return;
1167 }
1168 #endif /* CONFIG_FILS */
1169
1170 switch (msg) {
1171 case PAIRWISE_2:
1172 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1173 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1174 (!sm->update_snonce ||
1175 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1176 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1177 "received EAPOL-Key msg 2/4 in "
1178 "invalid state (%d) - dropped",
1179 sm->wpa_ptk_state);
1180 return;
1181 }
1182 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1183 if (sm->group->reject_4way_hs_for_entropy) {
1184 /*
1185 * The system did not have enough entropy to generate
1186 * strong random numbers. Reject the first 4-way
1187 * handshake(s) and collect some entropy based on the
1188 * information from it. Once enough entropy is
1189 * available, the next atempt will trigger GMK/Key
1190 * Counter update and the station will be allowed to
1191 * continue.
1192 */
1193 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1194 "collect more entropy for random number "
1195 "generation");
1196 random_mark_pool_ready();
1197 wpa_sta_disconnect(wpa_auth, sm->addr,
1198 WLAN_REASON_PREV_AUTH_NOT_VALID);
1199 return;
1200 }
1201 break;
1202 case PAIRWISE_4:
1203 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1204 !sm->PTK_valid) {
1205 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1206 "received EAPOL-Key msg 4/4 in "
1207 "invalid state (%d) - dropped",
1208 sm->wpa_ptk_state);
1209 return;
1210 }
1211 break;
1212 case GROUP_2:
1213 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1214 || !sm->PTK_valid) {
1215 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1216 "received EAPOL-Key msg 2/2 in "
1217 "invalid state (%d) - dropped",
1218 sm->wpa_ptk_group_state);
1219 return;
1220 }
1221 break;
1222 case REQUEST:
1223 break;
1224 }
1225
1226 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1227 "received EAPOL-Key frame (%s)", msgtxt);
1228
1229 if (key_info & WPA_KEY_INFO_ACK) {
1230 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1231 "received invalid EAPOL-Key: Key Ack set");
1232 return;
1233 }
1234
1235 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1236 !(key_info & WPA_KEY_INFO_MIC)) {
1237 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1238 "received invalid EAPOL-Key: Key MIC not set");
1239 return;
1240 }
1241
1242 #ifdef CONFIG_FILS
1243 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1244 (key_info & WPA_KEY_INFO_MIC)) {
1245 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1246 "received invalid EAPOL-Key: Key MIC set");
1247 return;
1248 }
1249 #endif /* CONFIG_FILS */
1250
1251 sm->MICVerified = FALSE;
1252 if (sm->PTK_valid && !sm->update_snonce) {
1253 if (mic_len &&
1254 wpa_verify_key_mic(sm->wpa_key_mgmt, sm->pmk_len, &sm->PTK,
1255 data, data_len) &&
1256 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1257 wpa_try_alt_snonce(sm, data, data_len))) {
1258 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1259 "received EAPOL-Key with invalid MIC");
1260 #ifdef TEST_FUZZ
1261 wpa_printf(MSG_INFO,
1262 "TEST: Ignore Key MIC failure for fuzz testing");
1263 goto continue_fuzz;
1264 #endif /* TEST_FUZZ */
1265 return;
1266 }
1267 #ifdef CONFIG_FILS
1268 if (!mic_len &&
1269 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1270 &key_data_length) < 0) {
1271 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1272 "received EAPOL-Key with invalid MIC");
1273 #ifdef TEST_FUZZ
1274 wpa_printf(MSG_INFO,
1275 "TEST: Ignore Key MIC failure for fuzz testing");
1276 goto continue_fuzz;
1277 #endif /* TEST_FUZZ */
1278 return;
1279 }
1280 #endif /* CONFIG_FILS */
1281 #ifdef TEST_FUZZ
1282 continue_fuzz:
1283 #endif /* TEST_FUZZ */
1284 sm->MICVerified = TRUE;
1285 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1286 sm->pending_1_of_4_timeout = 0;
1287 }
1288
1289 if (key_info & WPA_KEY_INFO_REQUEST) {
1290 if (sm->MICVerified) {
1291 sm->req_replay_counter_used = 1;
1292 os_memcpy(sm->req_replay_counter, key->replay_counter,
1293 WPA_REPLAY_COUNTER_LEN);
1294 } else {
1295 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1296 "received EAPOL-Key request with "
1297 "invalid MIC");
1298 return;
1299 }
1300
1301 /*
1302 * TODO: should decrypt key data field if encryption was used;
1303 * even though MAC address KDE is not normally encrypted,
1304 * supplicant is allowed to encrypt it.
1305 */
1306 if (key_info & WPA_KEY_INFO_ERROR) {
1307 if (wpa_receive_error_report(
1308 wpa_auth, sm,
1309 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1310 return; /* STA entry was removed */
1311 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1312 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1313 "received EAPOL-Key Request for new "
1314 "4-Way Handshake");
1315 wpa_request_new_ptk(sm);
1316 } else if (key_data_length > 0 &&
1317 wpa_parse_kde_ies(key_data, key_data_length,
1318 &kde) == 0 &&
1319 kde.mac_addr) {
1320 } else {
1321 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1322 "received EAPOL-Key Request for GTK "
1323 "rekeying");
1324 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1325 wpa_rekey_gtk(wpa_auth, NULL);
1326 }
1327 } else {
1328 /* Do not allow the same key replay counter to be reused. */
1329 wpa_replay_counter_mark_invalid(sm->key_replay,
1330 key->replay_counter);
1331
1332 if (msg == PAIRWISE_2) {
1333 /*
1334 * Maintain a copy of the pending EAPOL-Key frames in
1335 * case the EAPOL-Key frame was retransmitted. This is
1336 * needed to allow EAPOL-Key msg 2/4 reply to another
1337 * pending msg 1/4 to update the SNonce to work around
1338 * unexpected supplicant behavior.
1339 */
1340 os_memcpy(sm->prev_key_replay, sm->key_replay,
1341 sizeof(sm->key_replay));
1342 } else {
1343 os_memset(sm->prev_key_replay, 0,
1344 sizeof(sm->prev_key_replay));
1345 }
1346
1347 /*
1348 * Make sure old valid counters are not accepted anymore and
1349 * do not get copied again.
1350 */
1351 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1352 }
1353
1354 os_free(sm->last_rx_eapol_key);
1355 sm->last_rx_eapol_key = os_memdup(data, data_len);
1356 if (sm->last_rx_eapol_key == NULL)
1357 return;
1358 sm->last_rx_eapol_key_len = data_len;
1359
1360 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1361 sm->EAPOLKeyReceived = TRUE;
1362 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1363 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1364 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1365 wpa_sm_step(sm);
1366 }
1367
1368
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1369 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1370 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1371 {
1372 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + WPA_GTK_MAX_LEN];
1373 u8 *pos;
1374 int ret = 0;
1375
1376 /* GTK = PRF-X(GMK, "Group key expansion",
1377 * AA || GNonce || Time || random data)
1378 * The example described in the IEEE 802.11 standard uses only AA and
1379 * GNonce as inputs here. Add some more entropy since this derivation
1380 * is done only at the Authenticator and as such, does not need to be
1381 * exactly same.
1382 */
1383 os_memset(data, 0, sizeof(data));
1384 os_memcpy(data, addr, ETH_ALEN);
1385 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1386 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1387 wpa_get_ntp_timestamp(pos);
1388 #ifdef TEST_FUZZ
1389 os_memset(pos, 0xef, 8);
1390 #endif /* TEST_FUZZ */
1391 pos += 8;
1392 if (random_get_bytes(pos, gtk_len) < 0)
1393 ret = -1;
1394
1395 #ifdef CONFIG_SHA384
1396 if (sha384_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data),
1397 gtk, gtk_len) < 0)
1398 ret = -1;
1399 #else /* CONFIG_SHA384 */
1400 #ifdef CONFIG_SHA256
1401 if (sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data),
1402 gtk, gtk_len) < 0)
1403 ret = -1;
1404 #else /* CONFIG_SHA256 */
1405 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data),
1406 gtk, gtk_len) < 0)
1407 ret = -1;
1408 #endif /* CONFIG_SHA256 */
1409 #endif /* CONFIG_SHA384 */
1410
1411 forced_memzero(data, sizeof(data));
1412
1413 return ret;
1414 }
1415
1416
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1417 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1418 {
1419 struct wpa_authenticator *wpa_auth = eloop_ctx;
1420 struct wpa_state_machine *sm = timeout_ctx;
1421
1422 sm->pending_1_of_4_timeout = 0;
1423 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1424 sm->TimeoutEvt = TRUE;
1425 wpa_sm_step(sm);
1426 }
1427
1428
__wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr,int force_version)1429 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1430 struct wpa_state_machine *sm, int key_info,
1431 const u8 *key_rsc, const u8 *nonce,
1432 const u8 *kde, size_t kde_len,
1433 int keyidx, int encr, int force_version)
1434 {
1435 struct ieee802_1x_hdr *hdr;
1436 struct wpa_eapol_key *key;
1437 size_t len, mic_len, keyhdrlen;
1438 int alg;
1439 int key_data_len, pad_len = 0;
1440 u8 *buf, *pos;
1441 int version, pairwise;
1442 int i;
1443 u8 *key_mic, *key_data;
1444
1445 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
1446 keyhdrlen = sizeof(*key) + mic_len + 2;
1447
1448 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1449
1450 if (force_version)
1451 version = force_version;
1452 else if (wpa_use_akm_defined(sm->wpa_key_mgmt))
1453 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1454 else if (wpa_use_cmac(sm->wpa_key_mgmt))
1455 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1456 else if (sm->pairwise != WPA_CIPHER_TKIP)
1457 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1458 else
1459 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1460
1461 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1462
1463 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1464 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1465 "encr=%d)",
1466 version,
1467 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1468 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1469 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1470 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1471 pairwise, (unsigned long) kde_len, keyidx, encr);
1472
1473 key_data_len = kde_len;
1474
1475 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1476 wpa_use_aes_key_wrap(sm->wpa_key_mgmt) ||
1477 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1478 pad_len = key_data_len % 8;
1479 if (pad_len)
1480 pad_len = 8 - pad_len;
1481 key_data_len += pad_len + 8;
1482 }
1483
1484 len += key_data_len;
1485 if (!mic_len && encr)
1486 len += AES_BLOCK_SIZE;
1487
1488 hdr = os_zalloc(len);
1489 if (hdr == NULL)
1490 return;
1491 hdr->version = wpa_auth->conf.eapol_version;
1492 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1493 hdr->length = host_to_be16(len - sizeof(*hdr));
1494 key = (struct wpa_eapol_key *) (hdr + 1);
1495 key_mic = (u8 *) (key + 1);
1496 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1497
1498 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1499 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1500 key_info |= version;
1501 if (encr && sm->wpa == WPA_VERSION_WPA2)
1502 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1503 if (sm->wpa != WPA_VERSION_WPA2)
1504 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1505 WPA_PUT_BE16(key->key_info, key_info);
1506
1507 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1508 if (sm->wpa == WPA_VERSION_WPA2 && !pairwise)
1509 WPA_PUT_BE16(key->key_length, 0);
1510 else
1511 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1512
1513 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1514 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1515 os_memcpy(sm->key_replay[i].counter,
1516 sm->key_replay[i - 1].counter,
1517 WPA_REPLAY_COUNTER_LEN);
1518 }
1519 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1520 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1521 WPA_REPLAY_COUNTER_LEN);
1522 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1523 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1524 sm->key_replay[0].valid = TRUE;
1525
1526 if (nonce)
1527 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1528
1529 if (key_rsc)
1530 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1531
1532 if (kde && !encr) {
1533 os_memcpy(key_data, kde, kde_len);
1534 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1535 #ifdef CONFIG_FILS
1536 } else if (!mic_len && kde) {
1537 const u8 *aad[1];
1538 size_t aad_len[1];
1539
1540 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1541 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1542 kde, kde_len);
1543
1544 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1545 sm->PTK.kek, sm->PTK.kek_len);
1546 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1547 * to Key Data (exclusive). */
1548 aad[0] = (u8 *) hdr;
1549 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1550 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1551 1, aad, aad_len, key_mic + 2) < 0) {
1552 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1553 return;
1554 }
1555
1556 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1557 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1558 #endif /* CONFIG_FILS */
1559 } else if (encr && kde) {
1560 buf = os_zalloc(key_data_len);
1561 if (buf == NULL) {
1562 os_free(hdr);
1563 return;
1564 }
1565 pos = buf;
1566 os_memcpy(pos, kde, kde_len);
1567 pos += kde_len;
1568
1569 if (pad_len)
1570 *pos++ = 0xdd;
1571
1572 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1573 buf, key_data_len);
1574 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1575 wpa_use_aes_key_wrap(sm->wpa_key_mgmt) ||
1576 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1577 wpa_printf(MSG_DEBUG,
1578 "WPA: Encrypt Key Data using AES-WRAP (KEK length %u)",
1579 (unsigned int) sm->PTK.kek_len);
1580 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1581 (key_data_len - 8) / 8, buf, key_data)) {
1582 os_free(hdr);
1583 os_free(buf);
1584 return;
1585 }
1586 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1587 #ifndef CONFIG_NO_RC4
1588 } else if (sm->PTK.kek_len == 16) {
1589 u8 ek[32];
1590
1591 wpa_printf(MSG_DEBUG,
1592 "WPA: Encrypt Key Data using RC4");
1593 os_memcpy(key->key_iv,
1594 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1595 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1596 os_memcpy(ek, key->key_iv, 16);
1597 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1598 os_memcpy(key_data, buf, key_data_len);
1599 rc4_skip(ek, 32, 256, key_data, key_data_len);
1600 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1601 #endif /* CONFIG_NO_RC4 */
1602 } else {
1603 os_free(hdr);
1604 os_free(buf);
1605 return;
1606 }
1607 os_free(buf);
1608 }
1609
1610 if (key_info & WPA_KEY_INFO_MIC) {
1611 if (!sm->PTK_valid || !mic_len) {
1612 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1613 "PTK not valid when sending EAPOL-Key "
1614 "frame");
1615 os_free(hdr);
1616 return;
1617 }
1618
1619 if (wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1620 sm->wpa_key_mgmt, version,
1621 (u8 *) hdr, len, key_mic) < 0) {
1622 os_free(hdr);
1623 return;
1624 }
1625 #ifdef CONFIG_TESTING_OPTIONS
1626 if (!pairwise &&
1627 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1628 drand48() <
1629 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1630 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1631 "Corrupting group EAPOL-Key Key MIC");
1632 key_mic[0]++;
1633 }
1634 #endif /* CONFIG_TESTING_OPTIONS */
1635 }
1636
1637 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1638 1);
1639 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1640 sm->pairwise_set);
1641 os_free(hdr);
1642 }
1643
1644
wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr)1645 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1646 struct wpa_state_machine *sm, int key_info,
1647 const u8 *key_rsc, const u8 *nonce,
1648 const u8 *kde, size_t kde_len,
1649 int keyidx, int encr)
1650 {
1651 int timeout_ms;
1652 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1653 u32 ctr;
1654
1655 if (sm == NULL)
1656 return;
1657
1658 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1659 keyidx, encr, 0);
1660
1661 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1662 if (ctr == 1 && wpa_auth->conf.tx_status)
1663 timeout_ms = pairwise ? eapol_key_timeout_first :
1664 eapol_key_timeout_first_group;
1665 else
1666 timeout_ms = eapol_key_timeout_subseq;
1667 if (wpa_auth->conf.wpa_disable_eapol_key_retries &&
1668 (!pairwise || (key_info & WPA_KEY_INFO_MIC)))
1669 timeout_ms = eapol_key_timeout_no_retrans;
1670 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1671 sm->pending_1_of_4_timeout = 1;
1672 #ifdef TEST_FUZZ
1673 timeout_ms = 1;
1674 #endif /* TEST_FUZZ */
1675 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1676 "counter %u)", timeout_ms, ctr);
1677 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1678 wpa_send_eapol_timeout, wpa_auth, sm);
1679 }
1680
1681
wpa_verify_key_mic(int akmp,size_t pmk_len,struct wpa_ptk * PTK,u8 * data,size_t data_len)1682 static int wpa_verify_key_mic(int akmp, size_t pmk_len, struct wpa_ptk *PTK,
1683 u8 *data, size_t data_len)
1684 {
1685 struct ieee802_1x_hdr *hdr;
1686 struct wpa_eapol_key *key;
1687 u16 key_info;
1688 int ret = 0;
1689 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1690 size_t mic_len = wpa_mic_len(akmp, pmk_len);
1691
1692 if (data_len < sizeof(*hdr) + sizeof(*key))
1693 return -1;
1694
1695 hdr = (struct ieee802_1x_hdr *) data;
1696 key = (struct wpa_eapol_key *) (hdr + 1);
1697 mic_pos = (u8 *) (key + 1);
1698 key_info = WPA_GET_BE16(key->key_info);
1699 os_memcpy(mic, mic_pos, mic_len);
1700 os_memset(mic_pos, 0, mic_len);
1701 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1702 key_info & WPA_KEY_INFO_TYPE_MASK,
1703 data, data_len, mic_pos) ||
1704 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1705 ret = -1;
1706 os_memcpy(mic_pos, mic, mic_len);
1707 return ret;
1708 }
1709
1710
wpa_remove_ptk(struct wpa_state_machine * sm)1711 void wpa_remove_ptk(struct wpa_state_machine *sm)
1712 {
1713 sm->PTK_valid = FALSE;
1714 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1715 if (wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL,
1716 0))
1717 wpa_printf(MSG_DEBUG,
1718 "RSN: PTK removal from the driver failed");
1719 sm->pairwise_set = FALSE;
1720 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1721 }
1722
1723
wpa_auth_sm_event(struct wpa_state_machine * sm,enum wpa_event event)1724 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1725 {
1726 int remove_ptk = 1;
1727
1728 if (sm == NULL)
1729 return -1;
1730
1731 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1732 "event %d notification", event);
1733
1734 switch (event) {
1735 case WPA_AUTH:
1736 #ifdef CONFIG_MESH
1737 /* PTKs are derived through AMPE */
1738 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1739 /* not mesh */
1740 break;
1741 }
1742 return 0;
1743 #endif /* CONFIG_MESH */
1744 case WPA_ASSOC:
1745 break;
1746 case WPA_DEAUTH:
1747 case WPA_DISASSOC:
1748 sm->DeauthenticationRequest = TRUE;
1749 #ifdef CONFIG_IEEE80211R_AP
1750 os_memset(sm->PMK, 0, sizeof(sm->PMK));
1751 sm->pmk_len = 0;
1752 os_memset(sm->xxkey, 0, sizeof(sm->xxkey));
1753 sm->xxkey_len = 0;
1754 os_memset(sm->pmk_r1, 0, sizeof(sm->pmk_r1));
1755 sm->pmk_r1_len = 0;
1756 #endif /* CONFIG_IEEE80211R_AP */
1757 break;
1758 case WPA_REAUTH:
1759 case WPA_REAUTH_EAPOL:
1760 if (!sm->started) {
1761 /*
1762 * When using WPS, we may end up here if the STA
1763 * manages to re-associate without the previous STA
1764 * entry getting removed. Consequently, we need to make
1765 * sure that the WPA state machines gets initialized
1766 * properly at this point.
1767 */
1768 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1769 "started - initialize now");
1770 sm->started = 1;
1771 sm->Init = TRUE;
1772 if (wpa_sm_step(sm) == 1)
1773 return 1; /* should not really happen */
1774 sm->Init = FALSE;
1775 sm->AuthenticationRequest = TRUE;
1776 break;
1777 }
1778 if (sm->GUpdateStationKeys) {
1779 /*
1780 * Reauthentication cancels the pending group key
1781 * update for this STA.
1782 */
1783 sm->group->GKeyDoneStations--;
1784 sm->GUpdateStationKeys = FALSE;
1785 sm->PtkGroupInit = TRUE;
1786 }
1787 sm->ReAuthenticationRequest = TRUE;
1788 break;
1789 case WPA_ASSOC_FT:
1790 #ifdef CONFIG_IEEE80211R_AP
1791 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1792 "after association");
1793 wpa_ft_install_ptk(sm);
1794
1795 /* Using FT protocol, not WPA auth state machine */
1796 sm->ft_completed = 1;
1797 wpa_auth_set_ptk_rekey_timer(sm);
1798 return 0;
1799 #else /* CONFIG_IEEE80211R_AP */
1800 break;
1801 #endif /* CONFIG_IEEE80211R_AP */
1802 case WPA_ASSOC_FILS:
1803 #ifdef CONFIG_FILS
1804 wpa_printf(MSG_DEBUG,
1805 "FILS: TK configuration after association");
1806 fils_set_tk(sm);
1807 sm->fils_completed = 1;
1808 return 0;
1809 #else /* CONFIG_FILS */
1810 break;
1811 #endif /* CONFIG_FILS */
1812 case WPA_DRV_STA_REMOVED:
1813 sm->tk_already_set = FALSE;
1814 return 0;
1815 }
1816
1817 #ifdef CONFIG_IEEE80211R_AP
1818 sm->ft_completed = 0;
1819 #endif /* CONFIG_IEEE80211R_AP */
1820
1821 #ifdef CONFIG_IEEE80211W
1822 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1823 remove_ptk = 0;
1824 #endif /* CONFIG_IEEE80211W */
1825 #ifdef CONFIG_FILS
1826 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1827 (event == WPA_AUTH || event == WPA_ASSOC))
1828 remove_ptk = 0;
1829 #endif /* CONFIG_FILS */
1830
1831 if (remove_ptk) {
1832 sm->PTK_valid = FALSE;
1833 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1834
1835 if (event != WPA_REAUTH_EAPOL)
1836 wpa_remove_ptk(sm);
1837 }
1838
1839 if (sm->in_step_loop) {
1840 /*
1841 * wpa_sm_step() is already running - avoid recursive call to
1842 * it by making the existing loop process the new update.
1843 */
1844 sm->changed = TRUE;
1845 return 0;
1846 }
1847 return wpa_sm_step(sm);
1848 }
1849
1850
SM_STATE(WPA_PTK,INITIALIZE)1851 SM_STATE(WPA_PTK, INITIALIZE)
1852 {
1853 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1854 if (sm->Init) {
1855 /* Init flag is not cleared here, so avoid busy
1856 * loop by claiming nothing changed. */
1857 sm->changed = FALSE;
1858 }
1859
1860 sm->keycount = 0;
1861 if (sm->GUpdateStationKeys)
1862 sm->group->GKeyDoneStations--;
1863 sm->GUpdateStationKeys = FALSE;
1864 if (sm->wpa == WPA_VERSION_WPA)
1865 sm->PInitAKeys = FALSE;
1866 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1867 * Local AA > Remote AA)) */) {
1868 sm->Pair = TRUE;
1869 }
1870 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1871 wpa_remove_ptk(sm);
1872 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1873 sm->TimeoutCtr = 0;
1874 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
1875 sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP ||
1876 sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE) {
1877 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1878 WPA_EAPOL_authorized, 0);
1879 }
1880 }
1881
1882
SM_STATE(WPA_PTK,DISCONNECT)1883 SM_STATE(WPA_PTK, DISCONNECT)
1884 {
1885 u16 reason = sm->disconnect_reason;
1886
1887 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1888 sm->Disconnect = FALSE;
1889 sm->disconnect_reason = 0;
1890 if (!reason)
1891 reason = WLAN_REASON_PREV_AUTH_NOT_VALID;
1892 wpa_sta_disconnect(sm->wpa_auth, sm->addr, reason);
1893 }
1894
1895
SM_STATE(WPA_PTK,DISCONNECTED)1896 SM_STATE(WPA_PTK, DISCONNECTED)
1897 {
1898 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1899 sm->DeauthenticationRequest = FALSE;
1900 }
1901
1902
SM_STATE(WPA_PTK,AUTHENTICATION)1903 SM_STATE(WPA_PTK, AUTHENTICATION)
1904 {
1905 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1906 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1907 sm->PTK_valid = FALSE;
1908 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1909 1);
1910 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1911 sm->AuthenticationRequest = FALSE;
1912 }
1913
1914
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1915 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1916 struct wpa_group *group)
1917 {
1918 if (group->first_sta_seen)
1919 return;
1920 /*
1921 * System has run bit further than at the time hostapd was started
1922 * potentially very early during boot up. This provides better chances
1923 * of collecting more randomness on embedded systems. Re-initialize the
1924 * GMK and Counter here to improve their strength if there was not
1925 * enough entropy available immediately after system startup.
1926 */
1927 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1928 "station");
1929 if (random_pool_ready() != 1) {
1930 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1931 "to proceed - reject first 4-way handshake");
1932 group->reject_4way_hs_for_entropy = TRUE;
1933 } else {
1934 group->first_sta_seen = TRUE;
1935 group->reject_4way_hs_for_entropy = FALSE;
1936 }
1937
1938 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1939 wpa_gtk_update(wpa_auth, group) < 0 ||
1940 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1941 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1942 group->first_sta_seen = FALSE;
1943 group->reject_4way_hs_for_entropy = TRUE;
1944 }
1945 }
1946
1947
SM_STATE(WPA_PTK,AUTHENTICATION2)1948 SM_STATE(WPA_PTK, AUTHENTICATION2)
1949 {
1950 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1951
1952 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1953 sm->ReAuthenticationRequest = FALSE;
1954
1955 /*
1956 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1957 * ambiguous. The Authenticator state machine uses a counter that is
1958 * incremented by one for each 4-way handshake. However, the security
1959 * analysis of 4-way handshake points out that unpredictable nonces
1960 * help in preventing precomputation attacks. Instead of the state
1961 * machine definition, use an unpredictable nonce value here to provide
1962 * stronger protection against potential precomputation attacks.
1963 */
1964 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1965 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1966 "ANonce.");
1967 sm->Disconnect = TRUE;
1968 return;
1969 }
1970 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1971 WPA_NONCE_LEN);
1972 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1973 * logical place than INITIALIZE since AUTHENTICATION2 can be
1974 * re-entered on ReAuthenticationRequest without going through
1975 * INITIALIZE. */
1976 sm->TimeoutCtr = 0;
1977 }
1978
1979
wpa_auth_sm_ptk_update(struct wpa_state_machine * sm)1980 static int wpa_auth_sm_ptk_update(struct wpa_state_machine *sm)
1981 {
1982 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1983 wpa_printf(MSG_ERROR,
1984 "WPA: Failed to get random data for ANonce");
1985 sm->Disconnect = TRUE;
1986 return -1;
1987 }
1988 wpa_hexdump(MSG_DEBUG, "WPA: Assign new ANonce", sm->ANonce,
1989 WPA_NONCE_LEN);
1990 sm->TimeoutCtr = 0;
1991 return 0;
1992 }
1993
1994
SM_STATE(WPA_PTK,INITPMK)1995 SM_STATE(WPA_PTK, INITPMK)
1996 {
1997 u8 msk[2 * PMK_LEN];
1998 size_t len = 2 * PMK_LEN;
1999
2000 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
2001 #ifdef CONFIG_IEEE80211R_AP
2002 sm->xxkey_len = 0;
2003 #endif /* CONFIG_IEEE80211R_AP */
2004 if (sm->pmksa) {
2005 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
2006 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
2007 sm->pmk_len = sm->pmksa->pmk_len;
2008 #ifdef CONFIG_DPP
2009 } else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP) {
2010 wpa_printf(MSG_DEBUG,
2011 "DPP: No PMKSA cache entry for STA - reject connection");
2012 sm->Disconnect = TRUE;
2013 sm->disconnect_reason = WLAN_REASON_INVALID_PMKID;
2014 return;
2015 #endif /* CONFIG_DPP */
2016 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
2017 unsigned int pmk_len;
2018
2019 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
2020 pmk_len = PMK_LEN_SUITE_B_192;
2021 else
2022 pmk_len = PMK_LEN;
2023 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
2024 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
2025 pmk_len);
2026 if (len < pmk_len) {
2027 wpa_printf(MSG_DEBUG,
2028 "WPA: MSK not long enough (%u) to create PMK (%u)",
2029 (unsigned int) len, (unsigned int) pmk_len);
2030 sm->Disconnect = TRUE;
2031 return;
2032 }
2033 os_memcpy(sm->PMK, msk, pmk_len);
2034 sm->pmk_len = pmk_len;
2035 #ifdef CONFIG_IEEE80211R_AP
2036 if (len >= 2 * PMK_LEN) {
2037 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
2038 os_memcpy(sm->xxkey, msk, SHA384_MAC_LEN);
2039 sm->xxkey_len = SHA384_MAC_LEN;
2040 } else {
2041 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
2042 sm->xxkey_len = PMK_LEN;
2043 }
2044 }
2045 #endif /* CONFIG_IEEE80211R_AP */
2046 } else {
2047 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
2048 sm->wpa_auth->cb->get_msk);
2049 sm->Disconnect = TRUE;
2050 return;
2051 }
2052 forced_memzero(msk, sizeof(msk));
2053
2054 sm->req_replay_counter_used = 0;
2055 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
2056 * will break reauthentication since EAPOL state machines may not be
2057 * get into AUTHENTICATING state that clears keyRun before WPA state
2058 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
2059 * state and takes PMK from the previously used AAA Key. This will
2060 * eventually fail in 4-Way Handshake because Supplicant uses PMK
2061 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
2062 * be good workaround for this issue. */
2063 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
2064 }
2065
2066
SM_STATE(WPA_PTK,INITPSK)2067 SM_STATE(WPA_PTK, INITPSK)
2068 {
2069 const u8 *psk;
2070 size_t psk_len;
2071
2072 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
2073 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL,
2074 &psk_len, NULL);
2075 if (psk) {
2076 os_memcpy(sm->PMK, psk, psk_len);
2077 sm->pmk_len = psk_len;
2078 #ifdef CONFIG_IEEE80211R_AP
2079 os_memcpy(sm->xxkey, psk, PMK_LEN);
2080 sm->xxkey_len = PMK_LEN;
2081 #endif /* CONFIG_IEEE80211R_AP */
2082 }
2083 #ifdef CONFIG_SAE
2084 if (wpa_auth_uses_sae(sm) && sm->pmksa) {
2085 wpa_printf(MSG_DEBUG, "SAE: PMK from PMKSA cache");
2086 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
2087 sm->pmk_len = sm->pmksa->pmk_len;
2088 #ifdef CONFIG_IEEE80211R_AP
2089 os_memcpy(sm->xxkey, sm->pmksa->pmk, sm->pmksa->pmk_len);
2090 sm->xxkey_len = sm->pmksa->pmk_len;
2091 #endif /* CONFIG_IEEE80211R_AP */
2092 }
2093 #endif /* CONFIG_SAE */
2094 sm->req_replay_counter_used = 0;
2095 }
2096
2097
SM_STATE(WPA_PTK,PTKSTART)2098 SM_STATE(WPA_PTK, PTKSTART)
2099 {
2100 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
2101 size_t pmkid_len = 0;
2102
2103 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
2104 sm->PTKRequest = FALSE;
2105 sm->TimeoutEvt = FALSE;
2106 sm->alt_snonce_valid = FALSE;
2107
2108 sm->TimeoutCtr++;
2109 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
2110 /* No point in sending the EAPOL-Key - we will disconnect
2111 * immediately following this. */
2112 return;
2113 }
2114
2115 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2116 "sending 1/4 msg of 4-Way Handshake");
2117 /*
2118 * For infrastructure BSS cases, it is better for the AP not to include
2119 * the PMKID KDE in EAPOL-Key msg 1/4 since it could be used to initiate
2120 * offline search for the passphrase/PSK without having to be able to
2121 * capture a 4-way handshake from a STA that has access to the network.
2122 *
2123 * For IBSS cases, addition of PMKID KDE could be considered even with
2124 * WPA2-PSK cases that use multiple PSKs, but only if there is a single
2125 * possible PSK for this STA. However, this should not be done unless
2126 * there is support for using that information on the supplicant side.
2127 * The concern about exposing PMKID unnecessarily in infrastructure BSS
2128 * cases would also apply here, but at least in the IBSS case, this
2129 * would cover a potential real use case.
2130 */
2131 if (sm->wpa == WPA_VERSION_WPA2 &&
2132 (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) ||
2133 (sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE && sm->pmksa) ||
2134 wpa_key_mgmt_sae(sm->wpa_key_mgmt)) &&
2135 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
2136 pmkid = buf;
2137 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
2138 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
2139 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
2140 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2141 if (sm->pmksa) {
2142 wpa_hexdump(MSG_DEBUG,
2143 "RSN: Message 1/4 PMKID from PMKSA entry",
2144 sm->pmksa->pmkid, PMKID_LEN);
2145 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2146 sm->pmksa->pmkid, PMKID_LEN);
2147 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2148 /* No KCK available to derive PMKID */
2149 wpa_printf(MSG_DEBUG,
2150 "RSN: No KCK available to derive PMKID for message 1/4");
2151 pmkid = NULL;
2152 #ifdef CONFIG_FILS
2153 } else if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2154 if (sm->pmkid_set) {
2155 wpa_hexdump(MSG_DEBUG,
2156 "RSN: Message 1/4 PMKID from FILS/ERP",
2157 sm->pmkid, PMKID_LEN);
2158 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2159 sm->pmkid, PMKID_LEN);
2160 } else {
2161 /* No PMKID available */
2162 wpa_printf(MSG_DEBUG,
2163 "RSN: No FILS/ERP PMKID available for message 1/4");
2164 pmkid = NULL;
2165 }
2166 #endif /* CONFIG_FILS */
2167 #ifdef CONFIG_IEEE80211R_AP
2168 } else if (wpa_key_mgmt_ft(sm->wpa_key_mgmt) &&
2169 sm->ft_completed) {
2170 wpa_printf(MSG_DEBUG,
2171 "FT: No PMKID in message 1/4 when using FT protocol");
2172 pmkid = NULL;
2173 pmkid_len = 0;
2174 #endif /* CONFIG_IEEE80211R_AP */
2175 #ifdef CONFIG_SAE
2176 } else if (wpa_key_mgmt_sae(sm->wpa_key_mgmt)) {
2177 if (sm->pmkid_set) {
2178 wpa_hexdump(MSG_DEBUG,
2179 "RSN: Message 1/4 PMKID from SAE",
2180 sm->pmkid, PMKID_LEN);
2181 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2182 sm->pmkid, PMKID_LEN);
2183 } else {
2184 /* No PMKID available */
2185 wpa_printf(MSG_DEBUG,
2186 "RSN: No SAE PMKID available for message 1/4");
2187 pmkid = NULL;
2188 }
2189 #endif /* CONFIG_SAE */
2190 } else {
2191 /*
2192 * Calculate PMKID since no PMKSA cache entry was
2193 * available with pre-calculated PMKID.
2194 */
2195 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2196 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2197 sm->wpa_key_mgmt);
2198 wpa_hexdump(MSG_DEBUG,
2199 "RSN: Message 1/4 PMKID derived from PMK",
2200 &pmkid[2 + RSN_SELECTOR_LEN], PMKID_LEN);
2201 }
2202 }
2203 wpa_send_eapol(sm->wpa_auth, sm,
2204 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2205 sm->ANonce, pmkid, pmkid_len, 0, 0);
2206 }
2207
2208
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * snonce,const u8 * pmk,unsigned int pmk_len,struct wpa_ptk * ptk)2209 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2210 const u8 *pmk, unsigned int pmk_len,
2211 struct wpa_ptk *ptk)
2212 {
2213 const u8 *z = NULL;
2214 size_t z_len = 0;
2215
2216 #ifdef CONFIG_IEEE80211R_AP
2217 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2218 if (sm->ft_completed) {
2219 u8 ptk_name[WPA_PMK_NAME_LEN];
2220
2221 return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len,
2222 sm->SNonce, sm->ANonce,
2223 sm->addr, sm->wpa_auth->addr,
2224 sm->pmk_r1_name,
2225 ptk, ptk_name,
2226 sm->wpa_key_mgmt,
2227 sm->pairwise);
2228 }
2229 return wpa_auth_derive_ptk_ft(sm, ptk);
2230 }
2231 #endif /* CONFIG_IEEE80211R_AP */
2232
2233 #ifdef CONFIG_DPP2
2234 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP && sm->dpp_z) {
2235 z = wpabuf_head(sm->dpp_z);
2236 z_len = wpabuf_len(sm->dpp_z);
2237 }
2238 #endif /* CONFIG_DPP2 */
2239
2240 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2241 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2242 ptk, sm->wpa_key_mgmt, sm->pairwise, z, z_len);
2243 }
2244
2245
2246 #ifdef CONFIG_FILS
2247
fils_auth_pmk_to_ptk(struct wpa_state_machine * sm,const u8 * pmk,size_t pmk_len,const u8 * snonce,const u8 * anonce,const u8 * dhss,size_t dhss_len,struct wpabuf * g_sta,struct wpabuf * g_ap)2248 int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
2249 size_t pmk_len, const u8 *snonce, const u8 *anonce,
2250 const u8 *dhss, size_t dhss_len,
2251 struct wpabuf *g_sta, struct wpabuf *g_ap)
2252 {
2253 u8 ick[FILS_ICK_MAX_LEN];
2254 size_t ick_len;
2255 int res;
2256 u8 fils_ft[FILS_FT_MAX_LEN];
2257 size_t fils_ft_len = 0;
2258
2259 res = fils_pmk_to_ptk(pmk, pmk_len, sm->addr, sm->wpa_auth->addr,
2260 snonce, anonce, dhss, dhss_len,
2261 &sm->PTK, ick, &ick_len,
2262 sm->wpa_key_mgmt, sm->pairwise,
2263 fils_ft, &fils_ft_len);
2264 if (res < 0)
2265 return res;
2266 sm->PTK_valid = TRUE;
2267 sm->tk_already_set = FALSE;
2268
2269 #ifdef CONFIG_IEEE80211R_AP
2270 if (fils_ft_len) {
2271 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2272 struct wpa_auth_config *conf = &wpa_auth->conf;
2273 u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
2274 int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
2275 size_t pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
2276
2277 if (wpa_derive_pmk_r0(fils_ft, fils_ft_len,
2278 conf->ssid, conf->ssid_len,
2279 conf->mobility_domain,
2280 conf->r0_key_holder,
2281 conf->r0_key_holder_len,
2282 sm->addr, pmk_r0, pmk_r0_name,
2283 use_sha384) < 0)
2284 return -1;
2285
2286 wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0",
2287 pmk_r0, pmk_r0_len);
2288 wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR0Name",
2289 pmk_r0_name, WPA_PMK_NAME_LEN);
2290 wpa_ft_store_pmk_fils(sm, pmk_r0, pmk_r0_name);
2291 forced_memzero(fils_ft, sizeof(fils_ft));
2292
2293 res = wpa_derive_pmk_r1_name(pmk_r0_name, conf->r1_key_holder,
2294 sm->addr, sm->pmk_r1_name,
2295 use_sha384);
2296 forced_memzero(pmk_r0, PMK_LEN_MAX);
2297 if (res < 0)
2298 return -1;
2299 wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR1Name", sm->pmk_r1_name,
2300 WPA_PMK_NAME_LEN);
2301 sm->pmk_r1_name_valid = 1;
2302 }
2303 #endif /* CONFIG_IEEE80211R_AP */
2304
2305 res = fils_key_auth_sk(ick, ick_len, snonce, anonce,
2306 sm->addr, sm->wpa_auth->addr,
2307 g_sta ? wpabuf_head(g_sta) : NULL,
2308 g_sta ? wpabuf_len(g_sta) : 0,
2309 g_ap ? wpabuf_head(g_ap) : NULL,
2310 g_ap ? wpabuf_len(g_ap) : 0,
2311 sm->wpa_key_mgmt, sm->fils_key_auth_sta,
2312 sm->fils_key_auth_ap,
2313 &sm->fils_key_auth_len);
2314 forced_memzero(ick, sizeof(ick));
2315
2316 /* Store nonces for (Re)Association Request/Response frame processing */
2317 os_memcpy(sm->SNonce, snonce, FILS_NONCE_LEN);
2318 os_memcpy(sm->ANonce, anonce, FILS_NONCE_LEN);
2319
2320 return res;
2321 }
2322
2323
wpa_aead_decrypt(struct wpa_state_machine * sm,struct wpa_ptk * ptk,u8 * buf,size_t buf_len,u16 * _key_data_len)2324 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2325 u8 *buf, size_t buf_len, u16 *_key_data_len)
2326 {
2327 struct ieee802_1x_hdr *hdr;
2328 struct wpa_eapol_key *key;
2329 u8 *pos;
2330 u16 key_data_len;
2331 u8 *tmp;
2332 const u8 *aad[1];
2333 size_t aad_len[1];
2334
2335 hdr = (struct ieee802_1x_hdr *) buf;
2336 key = (struct wpa_eapol_key *) (hdr + 1);
2337 pos = (u8 *) (key + 1);
2338 key_data_len = WPA_GET_BE16(pos);
2339 if (key_data_len < AES_BLOCK_SIZE ||
2340 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2341 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2342 "No room for AES-SIV data in the frame");
2343 return -1;
2344 }
2345 pos += 2; /* Pointing at the Encrypted Key Data field */
2346
2347 tmp = os_malloc(key_data_len);
2348 if (!tmp)
2349 return -1;
2350
2351 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2352 * to Key Data (exclusive). */
2353 aad[0] = buf;
2354 aad_len[0] = pos - buf;
2355 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2356 1, aad, aad_len, tmp) < 0) {
2357 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2358 "Invalid AES-SIV data in the frame");
2359 bin_clear_free(tmp, key_data_len);
2360 return -1;
2361 }
2362
2363 /* AEAD decryption and validation completed successfully */
2364 key_data_len -= AES_BLOCK_SIZE;
2365 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2366 tmp, key_data_len);
2367
2368 /* Replace Key Data field with the decrypted version */
2369 os_memcpy(pos, tmp, key_data_len);
2370 pos -= 2; /* Key Data Length field */
2371 WPA_PUT_BE16(pos, key_data_len);
2372 bin_clear_free(tmp, key_data_len);
2373 if (_key_data_len)
2374 *_key_data_len = key_data_len;
2375 return 0;
2376 }
2377
2378
wpa_fils_validate_fils_session(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * fils_session)2379 const u8 * wpa_fils_validate_fils_session(struct wpa_state_machine *sm,
2380 const u8 *ies, size_t ies_len,
2381 const u8 *fils_session)
2382 {
2383 const u8 *ie, *end;
2384 const u8 *session = NULL;
2385
2386 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2387 wpa_printf(MSG_DEBUG,
2388 "FILS: Not a FILS AKM - reject association");
2389 return NULL;
2390 }
2391
2392 /* Verify Session element */
2393 ie = ies;
2394 end = ((const u8 *) ie) + ies_len;
2395 while (ie + 1 < end) {
2396 if (ie + 2 + ie[1] > end)
2397 break;
2398 if (ie[0] == WLAN_EID_EXTENSION &&
2399 ie[1] >= 1 + FILS_SESSION_LEN &&
2400 ie[2] == WLAN_EID_EXT_FILS_SESSION) {
2401 session = ie;
2402 break;
2403 }
2404 ie += 2 + ie[1];
2405 }
2406
2407 if (!session) {
2408 wpa_printf(MSG_DEBUG,
2409 "FILS: %s: Could not find FILS Session element in Assoc Req - reject",
2410 __func__);
2411 return NULL;
2412 }
2413
2414 if (!fils_session) {
2415 wpa_printf(MSG_DEBUG,
2416 "FILS: %s: Could not find FILS Session element in STA entry - reject",
2417 __func__);
2418 return NULL;
2419 }
2420
2421 if (os_memcmp(fils_session, session + 3, FILS_SESSION_LEN) != 0) {
2422 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
2423 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
2424 fils_session, FILS_SESSION_LEN);
2425 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
2426 session + 3, FILS_SESSION_LEN);
2427 return NULL;
2428 }
2429 return session;
2430 }
2431
2432
wpa_fils_validate_key_confirm(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)2433 int wpa_fils_validate_key_confirm(struct wpa_state_machine *sm, const u8 *ies,
2434 size_t ies_len)
2435 {
2436 struct ieee802_11_elems elems;
2437
2438 if (ieee802_11_parse_elems(ies, ies_len, &elems, 1) == ParseFailed) {
2439 wpa_printf(MSG_DEBUG,
2440 "FILS: Failed to parse decrypted elements");
2441 return -1;
2442 }
2443
2444 if (!elems.fils_session) {
2445 wpa_printf(MSG_DEBUG, "FILS: No FILS Session element");
2446 return -1;
2447 }
2448
2449 if (!elems.fils_key_confirm) {
2450 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
2451 return -1;
2452 }
2453
2454 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
2455 wpa_printf(MSG_DEBUG,
2456 "FILS: Unexpected Key-Auth length %d (expected %d)",
2457 elems.fils_key_confirm_len,
2458 (int) sm->fils_key_auth_len);
2459 return -1;
2460 }
2461
2462 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
2463 sm->fils_key_auth_len) != 0) {
2464 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
2465 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
2466 elems.fils_key_confirm, elems.fils_key_confirm_len);
2467 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
2468 sm->fils_key_auth_sta, sm->fils_key_auth_len);
2469 return -1;
2470 }
2471
2472 return 0;
2473 }
2474
2475
fils_decrypt_assoc(struct wpa_state_machine * sm,const u8 * fils_session,const struct ieee80211_mgmt * mgmt,size_t frame_len,u8 * pos,size_t left)2476 int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
2477 const struct ieee80211_mgmt *mgmt, size_t frame_len,
2478 u8 *pos, size_t left)
2479 {
2480 u16 fc, stype;
2481 const u8 *end, *ie_start, *ie, *session, *crypt;
2482 const u8 *aad[5];
2483 size_t aad_len[5];
2484
2485 if (!sm || !sm->PTK_valid) {
2486 wpa_printf(MSG_DEBUG,
2487 "FILS: No KEK to decrypt Assocication Request frame");
2488 return -1;
2489 }
2490
2491 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2492 wpa_printf(MSG_DEBUG,
2493 "FILS: Not a FILS AKM - reject association");
2494 return -1;
2495 }
2496
2497 end = ((const u8 *) mgmt) + frame_len;
2498 fc = le_to_host16(mgmt->frame_control);
2499 stype = WLAN_FC_GET_STYPE(fc);
2500 if (stype == WLAN_FC_STYPE_REASSOC_REQ)
2501 ie_start = mgmt->u.reassoc_req.variable;
2502 else
2503 ie_start = mgmt->u.assoc_req.variable;
2504 ie = ie_start;
2505
2506 /*
2507 * Find FILS Session element which is the last unencrypted element in
2508 * the frame.
2509 */
2510 session = wpa_fils_validate_fils_session(sm, ie, end - ie,
2511 fils_session);
2512 if (!session) {
2513 wpa_printf(MSG_DEBUG, "FILS: Session validation failed");
2514 return -1;
2515 }
2516
2517 crypt = session + 2 + session[1];
2518
2519 if (end - crypt < AES_BLOCK_SIZE) {
2520 wpa_printf(MSG_DEBUG,
2521 "FILS: Too short frame to include AES-SIV data");
2522 return -1;
2523 }
2524
2525 /* AES-SIV AAD vectors */
2526
2527 /* The STA's MAC address */
2528 aad[0] = mgmt->sa;
2529 aad_len[0] = ETH_ALEN;
2530 /* The AP's BSSID */
2531 aad[1] = mgmt->da;
2532 aad_len[1] = ETH_ALEN;
2533 /* The STA's nonce */
2534 aad[2] = sm->SNonce;
2535 aad_len[2] = FILS_NONCE_LEN;
2536 /* The AP's nonce */
2537 aad[3] = sm->ANonce;
2538 aad_len[3] = FILS_NONCE_LEN;
2539 /*
2540 * The (Re)Association Request frame from the Capability Information
2541 * field to the FILS Session element (both inclusive).
2542 */
2543 aad[4] = (const u8 *) &mgmt->u.assoc_req.capab_info;
2544 aad_len[4] = crypt - aad[4];
2545
2546 if (aes_siv_decrypt(sm->PTK.kek, sm->PTK.kek_len, crypt, end - crypt,
2547 5, aad, aad_len, pos + (crypt - ie_start)) < 0) {
2548 wpa_printf(MSG_DEBUG,
2549 "FILS: Invalid AES-SIV data in the frame");
2550 return -1;
2551 }
2552 wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
2553 pos, left - AES_BLOCK_SIZE);
2554
2555 if (wpa_fils_validate_key_confirm(sm, pos, left - AES_BLOCK_SIZE) < 0) {
2556 wpa_printf(MSG_DEBUG, "FILS: Key Confirm validation failed");
2557 return -1;
2558 }
2559
2560 return left - AES_BLOCK_SIZE;
2561 }
2562
2563
fils_encrypt_assoc(struct wpa_state_machine * sm,u8 * buf,size_t current_len,size_t max_len,const struct wpabuf * hlp)2564 int fils_encrypt_assoc(struct wpa_state_machine *sm, u8 *buf,
2565 size_t current_len, size_t max_len,
2566 const struct wpabuf *hlp)
2567 {
2568 u8 *end = buf + max_len;
2569 u8 *pos = buf + current_len;
2570 struct ieee80211_mgmt *mgmt;
2571 struct wpabuf *plain;
2572 const u8 *aad[5];
2573 size_t aad_len[5];
2574
2575 if (!sm || !sm->PTK_valid)
2576 return -1;
2577
2578 wpa_hexdump(MSG_DEBUG,
2579 "FILS: Association Response frame before FILS processing",
2580 buf, current_len);
2581
2582 mgmt = (struct ieee80211_mgmt *) buf;
2583
2584 /* AES-SIV AAD vectors */
2585
2586 /* The AP's BSSID */
2587 aad[0] = mgmt->sa;
2588 aad_len[0] = ETH_ALEN;
2589 /* The STA's MAC address */
2590 aad[1] = mgmt->da;
2591 aad_len[1] = ETH_ALEN;
2592 /* The AP's nonce */
2593 aad[2] = sm->ANonce;
2594 aad_len[2] = FILS_NONCE_LEN;
2595 /* The STA's nonce */
2596 aad[3] = sm->SNonce;
2597 aad_len[3] = FILS_NONCE_LEN;
2598 /*
2599 * The (Re)Association Response frame from the Capability Information
2600 * field (the same offset in both Association and Reassociation
2601 * Response frames) to the FILS Session element (both inclusive).
2602 */
2603 aad[4] = (const u8 *) &mgmt->u.assoc_resp.capab_info;
2604 aad_len[4] = pos - aad[4];
2605
2606 /* The following elements will be encrypted with AES-SIV */
2607 plain = fils_prepare_plainbuf(sm, hlp);
2608 if (!plain) {
2609 wpa_printf(MSG_DEBUG, "FILS: Plain buffer prep failed");
2610 return -1;
2611 }
2612
2613 if (pos + wpabuf_len(plain) + AES_BLOCK_SIZE > end) {
2614 wpa_printf(MSG_DEBUG,
2615 "FILS: Not enough room for FILS elements");
2616 wpabuf_clear_free(plain);
2617 return -1;
2618 }
2619
2620 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: Association Response plaintext",
2621 plain);
2622
2623 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len,
2624 wpabuf_head(plain), wpabuf_len(plain),
2625 5, aad, aad_len, pos) < 0) {
2626 wpabuf_clear_free(plain);
2627 return -1;
2628 }
2629
2630 wpa_hexdump(MSG_DEBUG,
2631 "FILS: Encrypted Association Response elements",
2632 pos, AES_BLOCK_SIZE + wpabuf_len(plain));
2633 current_len += wpabuf_len(plain) + AES_BLOCK_SIZE;
2634 wpabuf_clear_free(plain);
2635
2636 sm->fils_completed = 1;
2637
2638 return current_len;
2639 }
2640
2641
fils_prepare_plainbuf(struct wpa_state_machine * sm,const struct wpabuf * hlp)2642 static struct wpabuf * fils_prepare_plainbuf(struct wpa_state_machine *sm,
2643 const struct wpabuf *hlp)
2644 {
2645 struct wpabuf *plain;
2646 u8 *len, *tmp, *tmp2;
2647 u8 hdr[2];
2648 u8 *gtk, dummy_gtk[32];
2649 size_t gtk_len;
2650 struct wpa_group *gsm;
2651
2652 plain = wpabuf_alloc(1000);
2653 if (!plain)
2654 return NULL;
2655
2656 /* TODO: FILS Public Key */
2657
2658 /* FILS Key Confirmation */
2659 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2660 wpabuf_put_u8(plain, 1 + sm->fils_key_auth_len); /* Length */
2661 /* Element ID Extension */
2662 wpabuf_put_u8(plain, WLAN_EID_EXT_FILS_KEY_CONFIRM);
2663 wpabuf_put_data(plain, sm->fils_key_auth_ap, sm->fils_key_auth_len);
2664
2665 /* FILS HLP Container */
2666 if (hlp)
2667 wpabuf_put_buf(plain, hlp);
2668
2669 /* TODO: FILS IP Address Assignment */
2670
2671 /* Key Delivery */
2672 gsm = sm->group;
2673 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2674 len = wpabuf_put(plain, 1);
2675 wpabuf_put_u8(plain, WLAN_EID_EXT_KEY_DELIVERY);
2676 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN,
2677 wpabuf_put(plain, WPA_KEY_RSC_LEN));
2678 /* GTK KDE */
2679 gtk = gsm->GTK[gsm->GN - 1];
2680 gtk_len = gsm->GTK_len;
2681 if (sm->wpa_auth->conf.disable_gtk ||
2682 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
2683 /*
2684 * Provide unique random GTK to each STA to prevent use
2685 * of GTK in the BSS.
2686 */
2687 if (random_get_bytes(dummy_gtk, gtk_len) < 0) {
2688 wpabuf_clear_free(plain);
2689 return NULL;
2690 }
2691 gtk = dummy_gtk;
2692 }
2693 hdr[0] = gsm->GN & 0x03;
2694 hdr[1] = 0;
2695 tmp = wpabuf_put(plain, 0);
2696 tmp2 = wpa_add_kde(tmp, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2697 gtk, gtk_len);
2698 wpabuf_put(plain, tmp2 - tmp);
2699
2700 /* IGTK KDE */
2701 tmp = wpabuf_put(plain, 0);
2702 tmp2 = ieee80211w_kde_add(sm, tmp);
2703 wpabuf_put(plain, tmp2 - tmp);
2704
2705 *len = (u8 *) wpabuf_put(plain, 0) - len - 1;
2706
2707 #ifdef CONFIG_OCV
2708 if (wpa_auth_uses_ocv(sm)) {
2709 struct wpa_channel_info ci;
2710 u8 *pos;
2711
2712 if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
2713 wpa_printf(MSG_WARNING,
2714 "FILS: Failed to get channel info for OCI element");
2715 wpabuf_clear_free(plain);
2716 return NULL;
2717 }
2718
2719 pos = wpabuf_put(plain, OCV_OCI_EXTENDED_LEN);
2720 if (ocv_insert_extended_oci(&ci, pos) < 0) {
2721 wpabuf_clear_free(plain);
2722 return NULL;
2723 }
2724 }
2725 #endif /* CONFIG_OCV */
2726
2727 return plain;
2728 }
2729
2730
fils_set_tk(struct wpa_state_machine * sm)2731 int fils_set_tk(struct wpa_state_machine *sm)
2732 {
2733 enum wpa_alg alg;
2734 int klen;
2735
2736 if (!sm || !sm->PTK_valid) {
2737 wpa_printf(MSG_DEBUG, "FILS: No valid PTK available to set TK");
2738 return -1;
2739 }
2740 if (sm->tk_already_set) {
2741 wpa_printf(MSG_DEBUG, "FILS: TK already set to the driver");
2742 return -1;
2743 }
2744
2745 alg = wpa_cipher_to_alg(sm->pairwise);
2746 klen = wpa_cipher_key_len(sm->pairwise);
2747
2748 wpa_printf(MSG_DEBUG, "FILS: Configure TK to the driver");
2749 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2750 sm->PTK.tk, klen)) {
2751 wpa_printf(MSG_DEBUG, "FILS: Failed to set TK to the driver");
2752 return -1;
2753 }
2754 sm->tk_already_set = TRUE;
2755
2756 return 0;
2757 }
2758
2759
hostapd_eid_assoc_fils_session(struct wpa_state_machine * sm,u8 * buf,const u8 * fils_session,struct wpabuf * hlp)2760 u8 * hostapd_eid_assoc_fils_session(struct wpa_state_machine *sm, u8 *buf,
2761 const u8 *fils_session, struct wpabuf *hlp)
2762 {
2763 struct wpabuf *plain;
2764 u8 *pos = buf;
2765
2766 /* FILS Session */
2767 *pos++ = WLAN_EID_EXTENSION; /* Element ID */
2768 *pos++ = 1 + FILS_SESSION_LEN; /* Length */
2769 *pos++ = WLAN_EID_EXT_FILS_SESSION; /* Element ID Extension */
2770 os_memcpy(pos, fils_session, FILS_SESSION_LEN);
2771 pos += FILS_SESSION_LEN;
2772
2773 plain = fils_prepare_plainbuf(sm, hlp);
2774 if (!plain) {
2775 wpa_printf(MSG_DEBUG, "FILS: Plain buffer prep failed");
2776 return NULL;
2777 }
2778
2779 os_memcpy(pos, wpabuf_head(plain), wpabuf_len(plain));
2780 pos += wpabuf_len(plain);
2781
2782 wpa_printf(MSG_DEBUG, "%s: plain buf_len: %u", __func__,
2783 (unsigned int) wpabuf_len(plain));
2784 wpabuf_clear_free(plain);
2785 sm->fils_completed = 1;
2786 return pos;
2787 }
2788
2789 #endif /* CONFIG_FILS */
2790
2791
2792 #ifdef CONFIG_OCV
get_sta_tx_parameters(struct wpa_state_machine * sm,int ap_max_chanwidth,int ap_seg1_idx,int * bandwidth,int * seg1_idx)2793 int get_sta_tx_parameters(struct wpa_state_machine *sm, int ap_max_chanwidth,
2794 int ap_seg1_idx, int *bandwidth, int *seg1_idx)
2795 {
2796 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2797
2798 if (!wpa_auth->cb->get_sta_tx_params)
2799 return -1;
2800 return wpa_auth->cb->get_sta_tx_params(wpa_auth->cb_ctx, sm->addr,
2801 ap_max_chanwidth, ap_seg1_idx,
2802 bandwidth, seg1_idx);
2803 }
2804 #endif /* CONFIG_OCV */
2805
2806
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)2807 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2808 {
2809 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2810 struct wpa_ptk PTK;
2811 int ok = 0, psk_found = 0;
2812 const u8 *pmk = NULL;
2813 size_t pmk_len;
2814 int ft;
2815 const u8 *eapol_key_ie, *key_data, *mic;
2816 u16 key_data_length;
2817 size_t mic_len, eapol_key_ie_len;
2818 struct ieee802_1x_hdr *hdr;
2819 struct wpa_eapol_key *key;
2820 struct wpa_eapol_ie_parse kde;
2821 int vlan_id = 0;
2822
2823 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2824 sm->EAPOLKeyReceived = FALSE;
2825 sm->update_snonce = FALSE;
2826 os_memset(&PTK, 0, sizeof(PTK));
2827
2828 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
2829
2830 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2831 * WPA-PSK: iterate through possible PSKs and select the one matching
2832 * the packet */
2833 for (;;) {
2834 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
2835 !wpa_key_mgmt_sae(sm->wpa_key_mgmt)) {
2836 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2837 sm->p2p_dev_addr, pmk, &pmk_len,
2838 &vlan_id);
2839 if (pmk == NULL)
2840 break;
2841 psk_found = 1;
2842 #ifdef CONFIG_IEEE80211R_AP
2843 if (wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
2844 os_memcpy(sm->xxkey, pmk, pmk_len);
2845 sm->xxkey_len = pmk_len;
2846 }
2847 #endif /* CONFIG_IEEE80211R_AP */
2848 } else {
2849 pmk = sm->PMK;
2850 pmk_len = sm->pmk_len;
2851 }
2852
2853 if ((!pmk || !pmk_len) && sm->pmksa) {
2854 wpa_printf(MSG_DEBUG, "WPA: Use PMK from PMKSA cache");
2855 pmk = sm->pmksa->pmk;
2856 pmk_len = sm->pmksa->pmk_len;
2857 }
2858
2859 if (wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK) < 0)
2860 break;
2861
2862 if (mic_len &&
2863 wpa_verify_key_mic(sm->wpa_key_mgmt, pmk_len, &PTK,
2864 sm->last_rx_eapol_key,
2865 sm->last_rx_eapol_key_len) == 0) {
2866 if (sm->PMK != pmk) {
2867 os_memcpy(sm->PMK, pmk, pmk_len);
2868 sm->pmk_len = pmk_len;
2869 }
2870 ok = 1;
2871 break;
2872 }
2873
2874 #ifdef CONFIG_FILS
2875 if (!mic_len &&
2876 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2877 sm->last_rx_eapol_key_len, NULL) == 0) {
2878 ok = 1;
2879 break;
2880 }
2881 #endif /* CONFIG_FILS */
2882
2883 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
2884 wpa_key_mgmt_sae(sm->wpa_key_mgmt))
2885 break;
2886 }
2887
2888 if (!ok) {
2889 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2890 "invalid MIC in msg 2/4 of 4-Way Handshake");
2891 if (psk_found)
2892 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2893 return;
2894 }
2895
2896 /*
2897 * Note: last_rx_eapol_key length fields have already been validated in
2898 * wpa_receive().
2899 */
2900 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2901 key = (struct wpa_eapol_key *) (hdr + 1);
2902 mic = (u8 *) (key + 1);
2903 key_data = mic + mic_len + 2;
2904 key_data_length = WPA_GET_BE16(mic + mic_len);
2905 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2906 sizeof(*key) - mic_len - 2)
2907 return;
2908
2909 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2910 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2911 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2912 return;
2913 }
2914 if (kde.rsn_ie) {
2915 eapol_key_ie = kde.rsn_ie;
2916 eapol_key_ie_len = kde.rsn_ie_len;
2917 } else if (kde.osen) {
2918 eapol_key_ie = kde.osen;
2919 eapol_key_ie_len = kde.osen_len;
2920 } else {
2921 eapol_key_ie = kde.wpa_ie;
2922 eapol_key_ie_len = kde.wpa_ie_len;
2923 }
2924 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2925 if (sm->wpa_ie == NULL ||
2926 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2927 eapol_key_ie, eapol_key_ie_len)) {
2928 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2929 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2930 if (sm->wpa_ie) {
2931 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2932 sm->wpa_ie, sm->wpa_ie_len);
2933 }
2934 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2935 eapol_key_ie, eapol_key_ie_len);
2936 /* MLME-DEAUTHENTICATE.request */
2937 wpa_sta_disconnect(wpa_auth, sm->addr,
2938 WLAN_REASON_PREV_AUTH_NOT_VALID);
2939 return;
2940 }
2941 #ifdef CONFIG_OCV
2942 if (wpa_auth_uses_ocv(sm)) {
2943 struct wpa_channel_info ci;
2944 int tx_chanwidth;
2945 int tx_seg1_idx;
2946
2947 if (wpa_channel_info(wpa_auth, &ci) != 0) {
2948 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2949 "Failed to get channel info to validate received OCI in EAPOL-Key 2/4");
2950 return;
2951 }
2952
2953 if (get_sta_tx_parameters(sm,
2954 channel_width_to_int(ci.chanwidth),
2955 ci.seg1_idx, &tx_chanwidth,
2956 &tx_seg1_idx) < 0)
2957 return;
2958
2959 if (ocv_verify_tx_params(kde.oci, kde.oci_len, &ci,
2960 tx_chanwidth, tx_seg1_idx) != 0) {
2961 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2962 ocv_errorstr);
2963 return;
2964 }
2965 }
2966 #endif /* CONFIG_OCV */
2967 #ifdef CONFIG_IEEE80211R_AP
2968 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2969 wpa_sta_disconnect(wpa_auth, sm->addr,
2970 WLAN_REASON_PREV_AUTH_NOT_VALID);
2971 return;
2972 }
2973 #endif /* CONFIG_IEEE80211R_AP */
2974 #ifdef CONFIG_P2P
2975 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2976 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2977 int idx;
2978 wpa_printf(MSG_DEBUG,
2979 "P2P: IP address requested in EAPOL-Key exchange");
2980 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2981 if (idx >= 0) {
2982 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2983 bitfield_set(wpa_auth->ip_pool, idx);
2984 WPA_PUT_BE32(sm->ip_addr, start + idx);
2985 wpa_printf(MSG_DEBUG,
2986 "P2P: Assigned IP address %u.%u.%u.%u to "
2987 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2988 sm->ip_addr[2], sm->ip_addr[3],
2989 MAC2STR(sm->addr));
2990 }
2991 }
2992 #endif /* CONFIG_P2P */
2993
2994 #ifdef CONFIG_IEEE80211R_AP
2995 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2996 /*
2997 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2998 * with the value we derived.
2999 */
3000 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
3001 WPA_PMK_NAME_LEN) != 0) {
3002 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3003 "PMKR1Name mismatch in FT 4-way "
3004 "handshake");
3005 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
3006 "Supplicant",
3007 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
3008 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
3009 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
3010 return;
3011 }
3012 }
3013 #endif /* CONFIG_IEEE80211R_AP */
3014
3015 if (vlan_id && wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
3016 wpa_auth_update_vlan(wpa_auth, sm->addr, vlan_id) < 0) {
3017 wpa_sta_disconnect(wpa_auth, sm->addr,
3018 WLAN_REASON_PREV_AUTH_NOT_VALID);
3019 return;
3020 }
3021
3022 sm->pending_1_of_4_timeout = 0;
3023 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
3024
3025 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
3026 /* PSK may have changed from the previous choice, so update
3027 * state machine data based on whatever PSK was selected here.
3028 */
3029 os_memcpy(sm->PMK, pmk, PMK_LEN);
3030 sm->pmk_len = PMK_LEN;
3031 }
3032
3033 sm->MICVerified = TRUE;
3034
3035 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
3036 forced_memzero(&PTK, sizeof(PTK));
3037 sm->PTK_valid = TRUE;
3038 }
3039
3040
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)3041 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
3042 {
3043 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
3044 sm->TimeoutCtr = 0;
3045 }
3046
3047
3048 #ifdef CONFIG_IEEE80211W
3049
ieee80211w_kde_len(struct wpa_state_machine * sm)3050 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
3051 {
3052 if (sm->mgmt_frame_prot) {
3053 size_t len;
3054 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3055 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
3056 }
3057
3058 return 0;
3059 }
3060
3061
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)3062 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
3063 {
3064 struct wpa_igtk_kde igtk;
3065 struct wpa_group *gsm = sm->group;
3066 u8 rsc[WPA_KEY_RSC_LEN];
3067 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3068
3069 if (!sm->mgmt_frame_prot)
3070 return pos;
3071
3072 igtk.keyid[0] = gsm->GN_igtk;
3073 igtk.keyid[1] = 0;
3074 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
3075 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
3076 os_memset(igtk.pn, 0, sizeof(igtk.pn));
3077 else
3078 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
3079 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
3080 if (sm->wpa_auth->conf.disable_gtk ||
3081 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
3082 /*
3083 * Provide unique random IGTK to each STA to prevent use of
3084 * IGTK in the BSS.
3085 */
3086 if (random_get_bytes(igtk.igtk, len) < 0)
3087 return pos;
3088 }
3089 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
3090 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
3091 NULL, 0);
3092
3093 return pos;
3094 }
3095
3096 #else /* CONFIG_IEEE80211W */
3097
ieee80211w_kde_len(struct wpa_state_machine * sm)3098 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
3099 {
3100 return 0;
3101 }
3102
3103
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)3104 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
3105 {
3106 return pos;
3107 }
3108
3109 #endif /* CONFIG_IEEE80211W */
3110
3111
ocv_oci_len(struct wpa_state_machine * sm)3112 static int ocv_oci_len(struct wpa_state_machine *sm)
3113 {
3114 #ifdef CONFIG_OCV
3115 if (wpa_auth_uses_ocv(sm))
3116 return OCV_OCI_KDE_LEN;
3117 #endif /* CONFIG_OCV */
3118 return 0;
3119 }
3120
ocv_oci_add(struct wpa_state_machine * sm,u8 ** argpos)3121 static int ocv_oci_add(struct wpa_state_machine *sm, u8 **argpos)
3122 {
3123 #ifdef CONFIG_OCV
3124 struct wpa_channel_info ci;
3125
3126 if (!wpa_auth_uses_ocv(sm))
3127 return 0;
3128
3129 if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
3130 wpa_printf(MSG_WARNING,
3131 "Failed to get channel info for OCI element");
3132 return -1;
3133 }
3134
3135 return ocv_insert_oci_kde(&ci, argpos);
3136 #else /* CONFIG_OCV */
3137 return 0;
3138 #endif /* CONFIG_OCV */
3139 }
3140
3141
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)3142 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
3143 {
3144 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
3145 size_t gtk_len, kde_len;
3146 struct wpa_group *gsm = sm->group;
3147 u8 *wpa_ie;
3148 int wpa_ie_len, secure, keyidx, encr = 0;
3149
3150 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
3151 sm->TimeoutEvt = FALSE;
3152
3153 sm->TimeoutCtr++;
3154 if (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3155 sm->TimeoutCtr > 1) {
3156 /* Do not allow retransmission of EAPOL-Key msg 3/4 */
3157 return;
3158 }
3159 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
3160 /* No point in sending the EAPOL-Key - we will disconnect
3161 * immediately following this. */
3162 return;
3163 }
3164
3165 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
3166 GTK[GN], IGTK, [FTIE], [TIE * 2])
3167 */
3168 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3169 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3170 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
3171 wpa_ie = sm->wpa_auth->wpa_ie;
3172 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
3173 if (sm->wpa == WPA_VERSION_WPA &&
3174 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
3175 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
3176 /* WPA-only STA, remove RSN IE and possible MDIE */
3177 wpa_ie = wpa_ie + wpa_ie[1] + 2;
3178 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
3179 wpa_ie = wpa_ie + wpa_ie[1] + 2;
3180 wpa_ie_len = wpa_ie[1] + 2;
3181 }
3182 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3183 "sending 3/4 msg of 4-Way Handshake");
3184 if (sm->wpa == WPA_VERSION_WPA2) {
3185 /* WPA2 send GTK in the 4-way handshake */
3186 secure = 1;
3187 gtk = gsm->GTK[gsm->GN - 1];
3188 gtk_len = gsm->GTK_len;
3189 if (sm->wpa_auth->conf.disable_gtk ||
3190 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
3191 /*
3192 * Provide unique random GTK to each STA to prevent use
3193 * of GTK in the BSS.
3194 */
3195 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
3196 return;
3197 gtk = dummy_gtk;
3198 }
3199 keyidx = gsm->GN;
3200 _rsc = rsc;
3201 encr = 1;
3202 } else {
3203 /* WPA does not include GTK in msg 3/4 */
3204 secure = 0;
3205 gtk = NULL;
3206 gtk_len = 0;
3207 keyidx = 0;
3208 _rsc = NULL;
3209 if (sm->rx_eapol_key_secure) {
3210 /*
3211 * It looks like Windows 7 supplicant tries to use
3212 * Secure bit in msg 2/4 after having reported Michael
3213 * MIC failure and it then rejects the 4-way handshake
3214 * if msg 3/4 does not set Secure bit. Work around this
3215 * by setting the Secure bit here even in the case of
3216 * WPA if the supplicant used it first.
3217 */
3218 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3219 "STA used Secure bit in WPA msg 2/4 - "
3220 "set Secure for 3/4 as workaround");
3221 secure = 1;
3222 }
3223 }
3224
3225 kde_len = wpa_ie_len + ieee80211w_kde_len(sm) + ocv_oci_len(sm);
3226 if (gtk)
3227 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
3228 #ifdef CONFIG_IEEE80211R_AP
3229 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
3230 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
3231 kde_len += 300; /* FTIE + 2 * TIE */
3232 }
3233 #endif /* CONFIG_IEEE80211R_AP */
3234 #ifdef CONFIG_P2P
3235 if (WPA_GET_BE32(sm->ip_addr) > 0)
3236 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
3237 #endif /* CONFIG_P2P */
3238 kde = os_malloc(kde_len);
3239 if (kde == NULL)
3240 return;
3241
3242 pos = kde;
3243 os_memcpy(pos, wpa_ie, wpa_ie_len);
3244 pos += wpa_ie_len;
3245 #ifdef CONFIG_IEEE80211R_AP
3246 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
3247 int res;
3248 size_t elen;
3249
3250 elen = pos - kde;
3251 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
3252 if (res < 0) {
3253 wpa_printf(MSG_ERROR, "FT: Failed to insert "
3254 "PMKR1Name into RSN IE in EAPOL-Key data");
3255 os_free(kde);
3256 return;
3257 }
3258 pos -= wpa_ie_len;
3259 pos += elen;
3260 }
3261 #endif /* CONFIG_IEEE80211R_AP */
3262 if (gtk) {
3263 u8 hdr[2];
3264 hdr[0] = keyidx & 0x03;
3265 hdr[1] = 0;
3266 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3267 gtk, gtk_len);
3268 }
3269 pos = ieee80211w_kde_add(sm, pos);
3270 if (ocv_oci_add(sm, &pos) < 0) {
3271 os_free(kde);
3272 return;
3273 }
3274
3275 #ifdef CONFIG_IEEE80211R_AP
3276 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
3277 int res;
3278 struct wpa_auth_config *conf;
3279
3280 conf = &sm->wpa_auth->conf;
3281 if (sm->assoc_resp_ftie &&
3282 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
3283 os_memcpy(pos, sm->assoc_resp_ftie,
3284 2 + sm->assoc_resp_ftie[1]);
3285 res = 2 + sm->assoc_resp_ftie[1];
3286 } else {
3287 int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
3288
3289 res = wpa_write_ftie(conf, use_sha384,
3290 conf->r0_key_holder,
3291 conf->r0_key_holder_len,
3292 NULL, NULL, pos,
3293 kde + kde_len - pos,
3294 NULL, 0);
3295 }
3296 if (res < 0) {
3297 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
3298 "into EAPOL-Key Key Data");
3299 os_free(kde);
3300 return;
3301 }
3302 pos += res;
3303
3304 /* TIE[ReassociationDeadline] (TU) */
3305 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
3306 *pos++ = 5;
3307 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
3308 WPA_PUT_LE32(pos, conf->reassociation_deadline);
3309 pos += 4;
3310
3311 /* TIE[KeyLifetime] (seconds) */
3312 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
3313 *pos++ = 5;
3314 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
3315 WPA_PUT_LE32(pos, conf->r0_key_lifetime);
3316 pos += 4;
3317 }
3318 #endif /* CONFIG_IEEE80211R_AP */
3319 #ifdef CONFIG_P2P
3320 if (WPA_GET_BE32(sm->ip_addr) > 0) {
3321 u8 addr[3 * 4];
3322 os_memcpy(addr, sm->ip_addr, 4);
3323 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
3324 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
3325 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
3326 addr, sizeof(addr), NULL, 0);
3327 }
3328 #endif /* CONFIG_P2P */
3329
3330 wpa_send_eapol(sm->wpa_auth, sm,
3331 (secure ? WPA_KEY_INFO_SECURE : 0) |
3332 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
3333 WPA_KEY_INFO_MIC : 0) |
3334 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
3335 WPA_KEY_INFO_KEY_TYPE,
3336 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
3337 os_free(kde);
3338 }
3339
3340
SM_STATE(WPA_PTK,PTKINITDONE)3341 SM_STATE(WPA_PTK, PTKINITDONE)
3342 {
3343 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
3344 sm->EAPOLKeyReceived = FALSE;
3345 if (sm->Pair) {
3346 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
3347 int klen = wpa_cipher_key_len(sm->pairwise);
3348 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
3349 sm->PTK.tk, klen)) {
3350 wpa_sta_disconnect(sm->wpa_auth, sm->addr,
3351 WLAN_REASON_PREV_AUTH_NOT_VALID);
3352 return;
3353 }
3354 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
3355 sm->pairwise_set = TRUE;
3356
3357 wpa_auth_set_ptk_rekey_timer(sm);
3358
3359 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
3360 sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP ||
3361 sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE) {
3362 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
3363 WPA_EAPOL_authorized, 1);
3364 }
3365 }
3366
3367 if (0 /* IBSS == TRUE */) {
3368 sm->keycount++;
3369 if (sm->keycount == 2) {
3370 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
3371 WPA_EAPOL_portValid, 1);
3372 }
3373 } else {
3374 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
3375 1);
3376 }
3377 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
3378 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
3379 if (sm->wpa == WPA_VERSION_WPA)
3380 sm->PInitAKeys = TRUE;
3381 else
3382 sm->has_GTK = TRUE;
3383 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3384 "pairwise key handshake completed (%s)",
3385 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3386
3387 #ifdef CONFIG_IEEE80211R_AP
3388 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
3389 #endif /* CONFIG_IEEE80211R_AP */
3390 }
3391
3392
SM_STEP(WPA_PTK)3393 SM_STEP(WPA_PTK)
3394 {
3395 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3396
3397 if (sm->Init)
3398 SM_ENTER(WPA_PTK, INITIALIZE);
3399 else if (sm->Disconnect
3400 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
3401 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
3402 "WPA_PTK: sm->Disconnect");
3403 SM_ENTER(WPA_PTK, DISCONNECT);
3404 }
3405 else if (sm->DeauthenticationRequest)
3406 SM_ENTER(WPA_PTK, DISCONNECTED);
3407 else if (sm->AuthenticationRequest)
3408 SM_ENTER(WPA_PTK, AUTHENTICATION);
3409 else if (sm->ReAuthenticationRequest)
3410 SM_ENTER(WPA_PTK, AUTHENTICATION2);
3411 else if (sm->PTKRequest) {
3412 if (wpa_auth_sm_ptk_update(sm) < 0)
3413 SM_ENTER(WPA_PTK, DISCONNECTED);
3414 else
3415 SM_ENTER(WPA_PTK, PTKSTART);
3416 } else switch (sm->wpa_ptk_state) {
3417 case WPA_PTK_INITIALIZE:
3418 break;
3419 case WPA_PTK_DISCONNECT:
3420 SM_ENTER(WPA_PTK, DISCONNECTED);
3421 break;
3422 case WPA_PTK_DISCONNECTED:
3423 SM_ENTER(WPA_PTK, INITIALIZE);
3424 break;
3425 case WPA_PTK_AUTHENTICATION:
3426 SM_ENTER(WPA_PTK, AUTHENTICATION2);
3427 break;
3428 case WPA_PTK_AUTHENTICATION2:
3429 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
3430 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
3431 WPA_EAPOL_keyRun) > 0)
3432 SM_ENTER(WPA_PTK, INITPMK);
3433 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
3434 sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE
3435 /* FIX: && 802.1X::keyRun */)
3436 SM_ENTER(WPA_PTK, INITPSK);
3437 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP)
3438 SM_ENTER(WPA_PTK, INITPMK);
3439 break;
3440 case WPA_PTK_INITPMK:
3441 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
3442 WPA_EAPOL_keyAvailable) > 0) {
3443 SM_ENTER(WPA_PTK, PTKSTART);
3444 #ifdef CONFIG_DPP
3445 } else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP && sm->pmksa) {
3446 SM_ENTER(WPA_PTK, PTKSTART);
3447 #endif /* CONFIG_DPP */
3448 } else {
3449 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3450 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3451 "INITPMK - keyAvailable = false");
3452 SM_ENTER(WPA_PTK, DISCONNECT);
3453 }
3454 break;
3455 case WPA_PTK_INITPSK:
3456 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
3457 NULL, NULL, NULL)) {
3458 SM_ENTER(WPA_PTK, PTKSTART);
3459 #ifdef CONFIG_SAE
3460 } else if (wpa_auth_uses_sae(sm) && sm->pmksa) {
3461 SM_ENTER(WPA_PTK, PTKSTART);
3462 #endif /* CONFIG_SAE */
3463 } else {
3464 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3465 "no PSK configured for the STA");
3466 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3467 SM_ENTER(WPA_PTK, DISCONNECT);
3468 }
3469 break;
3470 case WPA_PTK_PTKSTART:
3471 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3472 sm->EAPOLKeyPairwise)
3473 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3474 else if (sm->TimeoutCtr >
3475 sm->wpa_auth->conf.wpa_pairwise_update_count) {
3476 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3477 wpa_auth_vlogger(
3478 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3479 "PTKSTART: Retry limit %u reached",
3480 sm->wpa_auth->conf.wpa_pairwise_update_count);
3481 SM_ENTER(WPA_PTK, DISCONNECT);
3482 } else if (sm->TimeoutEvt)
3483 SM_ENTER(WPA_PTK, PTKSTART);
3484 break;
3485 case WPA_PTK_PTKCALCNEGOTIATING:
3486 if (sm->MICVerified)
3487 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
3488 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3489 sm->EAPOLKeyPairwise)
3490 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3491 else if (sm->TimeoutEvt)
3492 SM_ENTER(WPA_PTK, PTKSTART);
3493 break;
3494 case WPA_PTK_PTKCALCNEGOTIATING2:
3495 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3496 break;
3497 case WPA_PTK_PTKINITNEGOTIATING:
3498 if (sm->update_snonce)
3499 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3500 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3501 sm->EAPOLKeyPairwise && sm->MICVerified)
3502 SM_ENTER(WPA_PTK, PTKINITDONE);
3503 else if (sm->TimeoutCtr >
3504 sm->wpa_auth->conf.wpa_pairwise_update_count ||
3505 (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3506 sm->TimeoutCtr > 1)) {
3507 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3508 wpa_auth_vlogger(
3509 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3510 "PTKINITNEGOTIATING: Retry limit %u reached",
3511 sm->wpa_auth->conf.wpa_pairwise_update_count);
3512 SM_ENTER(WPA_PTK, DISCONNECT);
3513 } else if (sm->TimeoutEvt)
3514 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3515 break;
3516 case WPA_PTK_PTKINITDONE:
3517 break;
3518 }
3519 }
3520
3521
SM_STATE(WPA_PTK_GROUP,IDLE)3522 SM_STATE(WPA_PTK_GROUP, IDLE)
3523 {
3524 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
3525 if (sm->Init) {
3526 /* Init flag is not cleared here, so avoid busy
3527 * loop by claiming nothing changed. */
3528 sm->changed = FALSE;
3529 }
3530 sm->GTimeoutCtr = 0;
3531 }
3532
3533
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)3534 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
3535 {
3536 u8 rsc[WPA_KEY_RSC_LEN];
3537 struct wpa_group *gsm = sm->group;
3538 const u8 *kde;
3539 u8 *kde_buf = NULL, *pos, hdr[2];
3540 size_t kde_len;
3541 u8 *gtk, dummy_gtk[32];
3542
3543 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
3544
3545 sm->GTimeoutCtr++;
3546 if (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3547 sm->GTimeoutCtr > 1) {
3548 /* Do not allow retransmission of EAPOL-Key group msg 1/2 */
3549 return;
3550 }
3551 if (sm->GTimeoutCtr > sm->wpa_auth->conf.wpa_group_update_count) {
3552 /* No point in sending the EAPOL-Key - we will disconnect
3553 * immediately following this. */
3554 return;
3555 }
3556
3557 if (sm->wpa == WPA_VERSION_WPA)
3558 sm->PInitAKeys = FALSE;
3559 sm->TimeoutEvt = FALSE;
3560 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
3561 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3562 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
3563 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3564 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3565 "sending 1/2 msg of Group Key Handshake");
3566
3567 gtk = gsm->GTK[gsm->GN - 1];
3568 if (sm->wpa_auth->conf.disable_gtk ||
3569 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
3570 /*
3571 * Provide unique random GTK to each STA to prevent use
3572 * of GTK in the BSS.
3573 */
3574 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
3575 return;
3576 gtk = dummy_gtk;
3577 }
3578 if (sm->wpa == WPA_VERSION_WPA2) {
3579 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
3580 ieee80211w_kde_len(sm) + ocv_oci_len(sm);
3581 kde_buf = os_malloc(kde_len);
3582 if (kde_buf == NULL)
3583 return;
3584
3585 kde = pos = kde_buf;
3586 hdr[0] = gsm->GN & 0x03;
3587 hdr[1] = 0;
3588 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3589 gtk, gsm->GTK_len);
3590 pos = ieee80211w_kde_add(sm, pos);
3591 if (ocv_oci_add(sm, &pos) < 0) {
3592 os_free(kde_buf);
3593 return;
3594 }
3595 kde_len = pos - kde;
3596 } else {
3597 kde = gtk;
3598 kde_len = gsm->GTK_len;
3599 }
3600
3601 wpa_send_eapol(sm->wpa_auth, sm,
3602 WPA_KEY_INFO_SECURE |
3603 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
3604 WPA_KEY_INFO_MIC : 0) |
3605 WPA_KEY_INFO_ACK |
3606 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
3607 rsc, NULL, kde, kde_len, gsm->GN, 1);
3608
3609 os_free(kde_buf);
3610 }
3611
3612
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)3613 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
3614 {
3615 #ifdef CONFIG_OCV
3616 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3617 const u8 *key_data, *mic;
3618 struct ieee802_1x_hdr *hdr;
3619 struct wpa_eapol_key *key;
3620 struct wpa_eapol_ie_parse kde;
3621 size_t mic_len;
3622 u16 key_data_length;
3623 #endif /* CONFIG_OCV */
3624
3625 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
3626 sm->EAPOLKeyReceived = FALSE;
3627
3628 #ifdef CONFIG_OCV
3629 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
3630
3631 /*
3632 * Note: last_rx_eapol_key length fields have already been validated in
3633 * wpa_receive().
3634 */
3635 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
3636 key = (struct wpa_eapol_key *) (hdr + 1);
3637 mic = (u8 *) (key + 1);
3638 key_data = mic + mic_len + 2;
3639 key_data_length = WPA_GET_BE16(mic + mic_len);
3640 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
3641 sizeof(*key) - mic_len - 2)
3642 return;
3643
3644 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
3645 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
3646 "received EAPOL-Key group msg 2/2 with invalid Key Data contents");
3647 return;
3648 }
3649
3650 if (wpa_auth_uses_ocv(sm)) {
3651 struct wpa_channel_info ci;
3652 int tx_chanwidth;
3653 int tx_seg1_idx;
3654
3655 if (wpa_channel_info(wpa_auth, &ci) != 0) {
3656 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
3657 "Failed to get channel info to validate received OCI in EAPOL-Key group 1/2");
3658 return;
3659 }
3660
3661 if (get_sta_tx_parameters(sm,
3662 channel_width_to_int(ci.chanwidth),
3663 ci.seg1_idx, &tx_chanwidth,
3664 &tx_seg1_idx) < 0)
3665 return;
3666
3667 if (ocv_verify_tx_params(kde.oci, kde.oci_len, &ci,
3668 tx_chanwidth, tx_seg1_idx) != 0) {
3669 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
3670 ocv_errorstr);
3671 return;
3672 }
3673 }
3674 #endif /* CONFIG_OCV */
3675
3676 if (sm->GUpdateStationKeys)
3677 sm->group->GKeyDoneStations--;
3678 sm->GUpdateStationKeys = FALSE;
3679 sm->GTimeoutCtr = 0;
3680 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
3681 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3682 "group key handshake completed (%s)",
3683 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3684 sm->has_GTK = TRUE;
3685 }
3686
3687
SM_STATE(WPA_PTK_GROUP,KEYERROR)3688 SM_STATE(WPA_PTK_GROUP, KEYERROR)
3689 {
3690 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
3691 if (sm->GUpdateStationKeys)
3692 sm->group->GKeyDoneStations--;
3693 sm->GUpdateStationKeys = FALSE;
3694 sm->Disconnect = TRUE;
3695 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3696 "group key handshake failed (%s) after %u tries",
3697 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN",
3698 sm->wpa_auth->conf.wpa_group_update_count);
3699 }
3700
3701
SM_STEP(WPA_PTK_GROUP)3702 SM_STEP(WPA_PTK_GROUP)
3703 {
3704 if (sm->Init || sm->PtkGroupInit) {
3705 SM_ENTER(WPA_PTK_GROUP, IDLE);
3706 sm->PtkGroupInit = FALSE;
3707 } else switch (sm->wpa_ptk_group_state) {
3708 case WPA_PTK_GROUP_IDLE:
3709 if (sm->GUpdateStationKeys ||
3710 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
3711 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3712 break;
3713 case WPA_PTK_GROUP_REKEYNEGOTIATING:
3714 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3715 !sm->EAPOLKeyPairwise && sm->MICVerified)
3716 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
3717 else if (sm->GTimeoutCtr >
3718 sm->wpa_auth->conf.wpa_group_update_count ||
3719 (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3720 sm->GTimeoutCtr > 1))
3721 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
3722 else if (sm->TimeoutEvt)
3723 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3724 break;
3725 case WPA_PTK_GROUP_KEYERROR:
3726 SM_ENTER(WPA_PTK_GROUP, IDLE);
3727 break;
3728 case WPA_PTK_GROUP_REKEYESTABLISHED:
3729 SM_ENTER(WPA_PTK_GROUP, IDLE);
3730 break;
3731 }
3732 }
3733
3734
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3735 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
3736 struct wpa_group *group)
3737 {
3738 int ret = 0;
3739
3740 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3741 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3742 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
3743 wpa_auth->addr, group->GNonce,
3744 group->GTK[group->GN - 1], group->GTK_len) < 0)
3745 ret = -1;
3746 wpa_hexdump_key(MSG_DEBUG, "GTK",
3747 group->GTK[group->GN - 1], group->GTK_len);
3748
3749 #ifdef CONFIG_IEEE80211W
3750 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3751 size_t len;
3752 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3753 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3754 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3755 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
3756 wpa_auth->addr, group->GNonce,
3757 group->IGTK[group->GN_igtk - 4], len) < 0)
3758 ret = -1;
3759 wpa_hexdump_key(MSG_DEBUG, "IGTK",
3760 group->IGTK[group->GN_igtk - 4], len);
3761 }
3762 #endif /* CONFIG_IEEE80211W */
3763
3764 return ret;
3765 }
3766
3767
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3768 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
3769 struct wpa_group *group)
3770 {
3771 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3772 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
3773 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
3774 group->wpa_group_state = WPA_GROUP_GTK_INIT;
3775
3776 /* GTK[0..N] = 0 */
3777 os_memset(group->GTK, 0, sizeof(group->GTK));
3778 group->GN = 1;
3779 group->GM = 2;
3780 #ifdef CONFIG_IEEE80211W
3781 group->GN_igtk = 4;
3782 group->GM_igtk = 5;
3783 #endif /* CONFIG_IEEE80211W */
3784 /* GTK[GN] = CalcGTK() */
3785 wpa_gtk_update(wpa_auth, group);
3786 }
3787
3788
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)3789 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
3790 {
3791 if (ctx != NULL && ctx != sm->group)
3792 return 0;
3793
3794 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
3795 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3796 "Not in PTKINITDONE; skip Group Key update");
3797 sm->GUpdateStationKeys = FALSE;
3798 return 0;
3799 }
3800 if (sm->GUpdateStationKeys) {
3801 /*
3802 * This should not really happen, so add a debug log entry.
3803 * Since we clear the GKeyDoneStations before the loop, the
3804 * station needs to be counted here anyway.
3805 */
3806 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3807 "GUpdateStationKeys was already set when "
3808 "marking station for GTK rekeying");
3809 }
3810
3811 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
3812 if (sm->is_wnmsleep)
3813 return 0;
3814
3815 sm->group->GKeyDoneStations++;
3816 sm->GUpdateStationKeys = TRUE;
3817
3818 wpa_sm_step(sm);
3819 return 0;
3820 }
3821
3822
3823 #ifdef CONFIG_WNM_AP
3824 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)3825 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
3826 {
3827 if (sm == NULL || sm->is_wnmsleep)
3828 return;
3829
3830 wpa_group_update_sta(sm, NULL);
3831 }
3832
3833
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)3834 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
3835 {
3836 if (sm)
3837 sm->is_wnmsleep = !!flag;
3838 }
3839
3840
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)3841 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3842 {
3843 struct wpa_group *gsm = sm->group;
3844 u8 *start = pos;
3845
3846 /*
3847 * GTK subelement:
3848 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
3849 * Key[5..32]
3850 */
3851 *pos++ = WNM_SLEEP_SUBELEM_GTK;
3852 *pos++ = 11 + gsm->GTK_len;
3853 /* Key ID in B0-B1 of Key Info */
3854 WPA_PUT_LE16(pos, gsm->GN & 0x03);
3855 pos += 2;
3856 *pos++ = gsm->GTK_len;
3857 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
3858 return 0;
3859 pos += 8;
3860 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3861 pos += gsm->GTK_len;
3862
3863 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
3864 gsm->GN);
3865 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
3866 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3867
3868 return pos - start;
3869 }
3870
3871
3872 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)3873 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3874 {
3875 struct wpa_group *gsm = sm->group;
3876 u8 *start = pos;
3877 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3878
3879 /*
3880 * IGTK subelement:
3881 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
3882 */
3883 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
3884 *pos++ = 2 + 6 + len;
3885 WPA_PUT_LE16(pos, gsm->GN_igtk);
3886 pos += 2;
3887 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
3888 return 0;
3889 pos += 6;
3890
3891 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
3892 pos += len;
3893
3894 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
3895 gsm->GN_igtk);
3896 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
3897 gsm->IGTK[gsm->GN_igtk - 4], len);
3898
3899 return pos - start;
3900 }
3901 #endif /* CONFIG_IEEE80211W */
3902 #endif /* CONFIG_WNM_AP */
3903
3904
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3905 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3906 struct wpa_group *group)
3907 {
3908 int tmp;
3909
3910 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3911 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3912 group->changed = TRUE;
3913 group->wpa_group_state = WPA_GROUP_SETKEYS;
3914 group->GTKReKey = FALSE;
3915 tmp = group->GM;
3916 group->GM = group->GN;
3917 group->GN = tmp;
3918 #ifdef CONFIG_IEEE80211W
3919 tmp = group->GM_igtk;
3920 group->GM_igtk = group->GN_igtk;
3921 group->GN_igtk = tmp;
3922 #endif /* CONFIG_IEEE80211W */
3923 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3924 * counting the STAs that are marked with GUpdateStationKeys instead of
3925 * including all STAs that could be in not-yet-completed state. */
3926 wpa_gtk_update(wpa_auth, group);
3927
3928 if (group->GKeyDoneStations) {
3929 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3930 "GKeyDoneStations=%d when starting new GTK rekey",
3931 group->GKeyDoneStations);
3932 group->GKeyDoneStations = 0;
3933 }
3934 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3935 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3936 group->GKeyDoneStations);
3937 }
3938
3939
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3940 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3941 struct wpa_group *group)
3942 {
3943 int ret = 0;
3944
3945 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3946 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3947 broadcast_ether_addr, group->GN,
3948 group->GTK[group->GN - 1], group->GTK_len) < 0)
3949 ret = -1;
3950
3951 #ifdef CONFIG_IEEE80211W
3952 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3953 enum wpa_alg alg;
3954 size_t len;
3955
3956 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3957 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3958
3959 if (ret == 0 &&
3960 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3961 broadcast_ether_addr, group->GN_igtk,
3962 group->IGTK[group->GN_igtk - 4], len) < 0)
3963 ret = -1;
3964 }
3965 #endif /* CONFIG_IEEE80211W */
3966
3967 return ret;
3968 }
3969
3970
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)3971 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3972 {
3973 if (sm->group == ctx) {
3974 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3975 " for discconnection due to fatal failure",
3976 MAC2STR(sm->addr));
3977 sm->Disconnect = TRUE;
3978 }
3979
3980 return 0;
3981 }
3982
3983
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3984 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3985 struct wpa_group *group)
3986 {
3987 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3988 group->changed = TRUE;
3989 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3990 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3991 }
3992
3993
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3994 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3995 struct wpa_group *group)
3996 {
3997 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3998 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3999 group->changed = TRUE;
4000 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
4001
4002 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
4003 wpa_group_fatal_failure(wpa_auth, group);
4004 return -1;
4005 }
4006
4007 return 0;
4008 }
4009
4010
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4011 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
4012 struct wpa_group *group)
4013 {
4014 if (group->GInit) {
4015 wpa_group_gtk_init(wpa_auth, group);
4016 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
4017 /* Do not allow group operations */
4018 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
4019 group->GTKAuthenticator) {
4020 wpa_group_setkeysdone(wpa_auth, group);
4021 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
4022 group->GTKReKey) {
4023 wpa_group_setkeys(wpa_auth, group);
4024 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
4025 if (group->GKeyDoneStations == 0)
4026 wpa_group_setkeysdone(wpa_auth, group);
4027 else if (group->GTKReKey)
4028 wpa_group_setkeys(wpa_auth, group);
4029 }
4030 }
4031
4032
wpa_sm_step(struct wpa_state_machine * sm)4033 static int wpa_sm_step(struct wpa_state_machine *sm)
4034 {
4035 if (sm == NULL)
4036 return 0;
4037
4038 if (sm->in_step_loop) {
4039 /* This should not happen, but if it does, make sure we do not
4040 * end up freeing the state machine too early by exiting the
4041 * recursive call. */
4042 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
4043 return 0;
4044 }
4045
4046 sm->in_step_loop = 1;
4047 do {
4048 if (sm->pending_deinit)
4049 break;
4050
4051 sm->changed = FALSE;
4052 sm->wpa_auth->group->changed = FALSE;
4053
4054 SM_STEP_RUN(WPA_PTK);
4055 if (sm->pending_deinit)
4056 break;
4057 SM_STEP_RUN(WPA_PTK_GROUP);
4058 if (sm->pending_deinit)
4059 break;
4060 wpa_group_sm_step(sm->wpa_auth, sm->group);
4061 } while (sm->changed || sm->wpa_auth->group->changed);
4062 sm->in_step_loop = 0;
4063
4064 if (sm->pending_deinit) {
4065 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
4066 "machine deinit for " MACSTR, MAC2STR(sm->addr));
4067 wpa_free_sta_sm(sm);
4068 return 1;
4069 }
4070 return 0;
4071 }
4072
4073
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)4074 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
4075 {
4076 struct wpa_state_machine *sm = eloop_ctx;
4077 wpa_sm_step(sm);
4078 }
4079
4080
wpa_auth_sm_notify(struct wpa_state_machine * sm)4081 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
4082 {
4083 if (sm == NULL)
4084 return;
4085 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
4086 }
4087
4088
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)4089 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
4090 {
4091 int tmp, i;
4092 struct wpa_group *group;
4093
4094 if (wpa_auth == NULL)
4095 return;
4096
4097 group = wpa_auth->group;
4098
4099 for (i = 0; i < 2; i++) {
4100 tmp = group->GM;
4101 group->GM = group->GN;
4102 group->GN = tmp;
4103 #ifdef CONFIG_IEEE80211W
4104 tmp = group->GM_igtk;
4105 group->GM_igtk = group->GN_igtk;
4106 group->GN_igtk = tmp;
4107 #endif /* CONFIG_IEEE80211W */
4108 wpa_gtk_update(wpa_auth, group);
4109 wpa_group_config_group_keys(wpa_auth, group);
4110 }
4111 }
4112
4113
wpa_bool_txt(int val)4114 static const char * wpa_bool_txt(int val)
4115 {
4116 return val ? "TRUE" : "FALSE";
4117 }
4118
4119
4120 #define RSN_SUITE "%02x-%02x-%02x-%d"
4121 #define RSN_SUITE_ARG(s) \
4122 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
4123
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)4124 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
4125 {
4126 int len = 0, ret;
4127 char pmkid_txt[PMKID_LEN * 2 + 1];
4128 #ifdef CONFIG_RSN_PREAUTH
4129 const int preauth = 1;
4130 #else /* CONFIG_RSN_PREAUTH */
4131 const int preauth = 0;
4132 #endif /* CONFIG_RSN_PREAUTH */
4133
4134 if (wpa_auth == NULL)
4135 return len;
4136
4137 ret = os_snprintf(buf + len, buflen - len,
4138 "dot11RSNAOptionImplemented=TRUE\n"
4139 "dot11RSNAPreauthenticationImplemented=%s\n"
4140 "dot11RSNAEnabled=%s\n"
4141 "dot11RSNAPreauthenticationEnabled=%s\n",
4142 wpa_bool_txt(preauth),
4143 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
4144 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
4145 if (os_snprintf_error(buflen - len, ret))
4146 return len;
4147 len += ret;
4148
4149 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
4150 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
4151
4152 ret = os_snprintf(
4153 buf + len, buflen - len,
4154 "dot11RSNAConfigVersion=%u\n"
4155 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
4156 /* FIX: dot11RSNAConfigGroupCipher */
4157 /* FIX: dot11RSNAConfigGroupRekeyMethod */
4158 /* FIX: dot11RSNAConfigGroupRekeyTime */
4159 /* FIX: dot11RSNAConfigGroupRekeyPackets */
4160 "dot11RSNAConfigGroupRekeyStrict=%u\n"
4161 "dot11RSNAConfigGroupUpdateCount=%u\n"
4162 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
4163 "dot11RSNAConfigGroupCipherSize=%u\n"
4164 "dot11RSNAConfigPMKLifetime=%u\n"
4165 "dot11RSNAConfigPMKReauthThreshold=%u\n"
4166 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
4167 "dot11RSNAConfigSATimeout=%u\n"
4168 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
4169 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
4170 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
4171 "dot11RSNAPMKIDUsed=%s\n"
4172 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
4173 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
4174 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
4175 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
4176 "dot11RSNA4WayHandshakeFailures=%u\n"
4177 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
4178 RSN_VERSION,
4179 !!wpa_auth->conf.wpa_strict_rekey,
4180 wpa_auth->conf.wpa_group_update_count,
4181 wpa_auth->conf.wpa_pairwise_update_count,
4182 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
4183 dot11RSNAConfigPMKLifetime,
4184 dot11RSNAConfigPMKReauthThreshold,
4185 dot11RSNAConfigSATimeout,
4186 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
4187 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
4188 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
4189 pmkid_txt,
4190 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
4191 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
4192 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
4193 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
4194 wpa_auth->dot11RSNA4WayHandshakeFailures);
4195 if (os_snprintf_error(buflen - len, ret))
4196 return len;
4197 len += ret;
4198
4199 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
4200 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
4201
4202 /* Private MIB */
4203 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
4204 wpa_auth->group->wpa_group_state);
4205 if (os_snprintf_error(buflen - len, ret))
4206 return len;
4207 len += ret;
4208
4209 return len;
4210 }
4211
4212
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)4213 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
4214 {
4215 int len = 0, ret;
4216 u32 pairwise = 0;
4217
4218 if (sm == NULL)
4219 return 0;
4220
4221 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
4222
4223 /* dot11RSNAStatsEntry */
4224
4225 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
4226 WPA_PROTO_RSN : WPA_PROTO_WPA,
4227 sm->pairwise);
4228 if (pairwise == 0)
4229 return 0;
4230
4231 ret = os_snprintf(
4232 buf + len, buflen - len,
4233 /* TODO: dot11RSNAStatsIndex */
4234 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
4235 "dot11RSNAStatsVersion=1\n"
4236 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
4237 /* TODO: dot11RSNAStatsTKIPICVErrors */
4238 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
4239 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
4240 /* TODO: dot11RSNAStatsCCMPReplays */
4241 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
4242 /* TODO: dot11RSNAStatsTKIPReplays */,
4243 MAC2STR(sm->addr),
4244 RSN_SUITE_ARG(pairwise),
4245 sm->dot11RSNAStatsTKIPLocalMICFailures,
4246 sm->dot11RSNAStatsTKIPRemoteMICFailures);
4247 if (os_snprintf_error(buflen - len, ret))
4248 return len;
4249 len += ret;
4250
4251 /* Private MIB */
4252 ret = os_snprintf(buf + len, buflen - len,
4253 "wpa=%d\n"
4254 "AKMSuiteSelector=" RSN_SUITE "\n"
4255 "hostapdWPAPTKState=%d\n"
4256 "hostapdWPAPTKGroupState=%d\n",
4257 sm->wpa,
4258 RSN_SUITE_ARG(wpa_akm_to_suite(sm->wpa_key_mgmt)),
4259 sm->wpa_ptk_state,
4260 sm->wpa_ptk_group_state);
4261 if (os_snprintf_error(buflen - len, ret))
4262 return len;
4263 len += ret;
4264
4265 return len;
4266 }
4267
4268
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)4269 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
4270 {
4271 if (wpa_auth)
4272 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
4273 }
4274
4275
wpa_auth_pairwise_set(struct wpa_state_machine * sm)4276 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
4277 {
4278 return sm && sm->pairwise_set;
4279 }
4280
4281
wpa_auth_get_pairwise(struct wpa_state_machine * sm)4282 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
4283 {
4284 return sm->pairwise;
4285 }
4286
4287
wpa_auth_get_pmk(struct wpa_state_machine * sm,int * len)4288 const u8 * wpa_auth_get_pmk(struct wpa_state_machine *sm, int *len)
4289 {
4290 if (!sm)
4291 return NULL;
4292 *len = sm->pmk_len;
4293 return sm->PMK;
4294 }
4295
4296
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)4297 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
4298 {
4299 if (sm == NULL)
4300 return -1;
4301 return sm->wpa_key_mgmt;
4302 }
4303
4304
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)4305 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
4306 {
4307 if (sm == NULL)
4308 return 0;
4309 return sm->wpa;
4310 }
4311
4312
wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine * sm)4313 int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm)
4314 {
4315 if (!sm || !wpa_key_mgmt_ft(sm->wpa_key_mgmt))
4316 return 0;
4317 return sm->tk_already_set;
4318 }
4319
4320
wpa_auth_sta_fils_tk_already_set(struct wpa_state_machine * sm)4321 int wpa_auth_sta_fils_tk_already_set(struct wpa_state_machine *sm)
4322 {
4323 if (!sm || !wpa_key_mgmt_fils(sm->wpa_key_mgmt))
4324 return 0;
4325 return sm->tk_already_set;
4326 }
4327
4328
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)4329 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
4330 struct rsn_pmksa_cache_entry *entry)
4331 {
4332 if (sm == NULL || sm->pmksa != entry)
4333 return -1;
4334 sm->pmksa = NULL;
4335 return 0;
4336 }
4337
4338
4339 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)4340 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
4341 {
4342 return sm ? sm->pmksa : NULL;
4343 }
4344
4345
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)4346 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
4347 {
4348 if (sm)
4349 sm->dot11RSNAStatsTKIPLocalMICFailures++;
4350 }
4351
4352
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)4353 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
4354 {
4355 if (wpa_auth == NULL)
4356 return NULL;
4357 *len = wpa_auth->wpa_ie_len;
4358 return wpa_auth->wpa_ie;
4359 }
4360
4361
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,unsigned int pmk_len,int session_timeout,struct eapol_state_machine * eapol)4362 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
4363 unsigned int pmk_len,
4364 int session_timeout, struct eapol_state_machine *eapol)
4365 {
4366 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
4367 sm->wpa_auth->conf.disable_pmksa_caching)
4368 return -1;
4369
4370 #ifdef CONFIG_IEEE80211R_AP
4371 if (pmk_len >= 2 * PMK_LEN && wpa_key_mgmt_ft(sm->wpa_key_mgmt) &&
4372 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
4373 !wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
4374 /* Cache MPMK/XXKey instead of initial part from MSK */
4375 pmk = pmk + PMK_LEN;
4376 pmk_len = PMK_LEN;
4377 } else
4378 #endif /* CONFIG_IEEE80211R_AP */
4379 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
4380 if (pmk_len > PMK_LEN_SUITE_B_192)
4381 pmk_len = PMK_LEN_SUITE_B_192;
4382 } else if (pmk_len > PMK_LEN) {
4383 pmk_len = PMK_LEN;
4384 }
4385
4386 wpa_hexdump_key(MSG_DEBUG, "RSN: Cache PMK", pmk, pmk_len);
4387 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
4388 sm->PTK.kck, sm->PTK.kck_len,
4389 sm->wpa_auth->addr, sm->addr, session_timeout,
4390 eapol, sm->wpa_key_mgmt))
4391 return 0;
4392
4393 return -1;
4394 }
4395
4396
wpa_auth_pmksa_add_preauth(struct wpa_authenticator * wpa_auth,const u8 * pmk,size_t len,const u8 * sta_addr,int session_timeout,struct eapol_state_machine * eapol)4397 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
4398 const u8 *pmk, size_t len, const u8 *sta_addr,
4399 int session_timeout,
4400 struct eapol_state_machine *eapol)
4401 {
4402 if (wpa_auth == NULL)
4403 return -1;
4404
4405 wpa_hexdump_key(MSG_DEBUG, "RSN: Cache PMK from preauth", pmk, len);
4406 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
4407 NULL, 0,
4408 wpa_auth->addr,
4409 sta_addr, session_timeout, eapol,
4410 WPA_KEY_MGMT_IEEE8021X))
4411 return 0;
4412
4413 return -1;
4414 }
4415
4416
wpa_auth_pmksa_add_sae(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * pmk,const u8 * pmkid)4417 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
4418 const u8 *pmk, const u8 *pmkid)
4419 {
4420 if (wpa_auth->conf.disable_pmksa_caching)
4421 return -1;
4422
4423 wpa_hexdump_key(MSG_DEBUG, "RSN: Cache PMK from SAE", pmk, PMK_LEN);
4424 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
4425 NULL, 0,
4426 wpa_auth->addr, addr, 0, NULL,
4427 WPA_KEY_MGMT_SAE))
4428 return 0;
4429
4430 return -1;
4431 }
4432
4433
wpa_auth_add_sae_pmkid(struct wpa_state_machine * sm,const u8 * pmkid)4434 void wpa_auth_add_sae_pmkid(struct wpa_state_machine *sm, const u8 *pmkid)
4435 {
4436 os_memcpy(sm->pmkid, pmkid, PMKID_LEN);
4437 sm->pmkid_set = 1;
4438 }
4439
4440
wpa_auth_pmksa_add2(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * pmk,size_t pmk_len,const u8 * pmkid,int session_timeout,int akmp)4441 int wpa_auth_pmksa_add2(struct wpa_authenticator *wpa_auth, const u8 *addr,
4442 const u8 *pmk, size_t pmk_len, const u8 *pmkid,
4443 int session_timeout, int akmp)
4444 {
4445 if (wpa_auth->conf.disable_pmksa_caching)
4446 return -1;
4447
4448 wpa_hexdump_key(MSG_DEBUG, "RSN: Cache PMK (2)", pmk, PMK_LEN);
4449 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, pmk_len, pmkid,
4450 NULL, 0, wpa_auth->addr, addr, session_timeout,
4451 NULL, akmp))
4452 return 0;
4453
4454 return -1;
4455 }
4456
4457
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)4458 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
4459 const u8 *sta_addr)
4460 {
4461 struct rsn_pmksa_cache_entry *pmksa;
4462
4463 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
4464 return;
4465 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
4466 if (pmksa) {
4467 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
4468 MACSTR " based on request", MAC2STR(sta_addr));
4469 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
4470 }
4471 }
4472
4473
wpa_auth_pmksa_list(struct wpa_authenticator * wpa_auth,char * buf,size_t len)4474 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
4475 size_t len)
4476 {
4477 if (!wpa_auth || !wpa_auth->pmksa)
4478 return 0;
4479 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
4480 }
4481
4482
wpa_auth_pmksa_flush(struct wpa_authenticator * wpa_auth)4483 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
4484 {
4485 if (wpa_auth && wpa_auth->pmksa)
4486 pmksa_cache_auth_flush(wpa_auth->pmksa);
4487 }
4488
4489
4490 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
4491 #ifdef CONFIG_MESH
4492
wpa_auth_pmksa_list_mesh(struct wpa_authenticator * wpa_auth,const u8 * addr,char * buf,size_t len)4493 int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
4494 char *buf, size_t len)
4495 {
4496 if (!wpa_auth || !wpa_auth->pmksa)
4497 return 0;
4498
4499 return pmksa_cache_auth_list_mesh(wpa_auth->pmksa, addr, buf, len);
4500 }
4501
4502
4503 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_create_entry(const u8 * aa,const u8 * spa,const u8 * pmk,const u8 * pmkid,int expiration)4504 wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
4505 const u8 *pmkid, int expiration)
4506 {
4507 struct rsn_pmksa_cache_entry *entry;
4508 struct os_reltime now;
4509
4510 entry = pmksa_cache_auth_create_entry(pmk, PMK_LEN, pmkid, NULL, 0, aa,
4511 spa, 0, NULL, WPA_KEY_MGMT_SAE);
4512 if (!entry)
4513 return NULL;
4514
4515 os_get_reltime(&now);
4516 entry->expiration = now.sec + expiration;
4517 return entry;
4518 }
4519
4520
wpa_auth_pmksa_add_entry(struct wpa_authenticator * wpa_auth,struct rsn_pmksa_cache_entry * entry)4521 int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
4522 struct rsn_pmksa_cache_entry *entry)
4523 {
4524 int ret;
4525
4526 if (!wpa_auth || !wpa_auth->pmksa)
4527 return -1;
4528
4529 ret = pmksa_cache_auth_add_entry(wpa_auth->pmksa, entry);
4530 if (ret < 0)
4531 wpa_printf(MSG_DEBUG,
4532 "RSN: Failed to store external PMKSA cache for "
4533 MACSTR, MAC2STR(entry->spa));
4534
4535 return ret;
4536 }
4537
4538 #endif /* CONFIG_MESH */
4539 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
4540
4541
4542 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_get(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * pmkid)4543 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
4544 const u8 *pmkid)
4545 {
4546 if (!wpa_auth || !wpa_auth->pmksa)
4547 return NULL;
4548 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, pmkid);
4549 }
4550
4551
wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry * pmksa,struct wpa_state_machine * sm,struct wpa_authenticator * wpa_auth,u8 * pmkid,u8 * pmk)4552 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
4553 struct wpa_state_machine *sm,
4554 struct wpa_authenticator *wpa_auth,
4555 u8 *pmkid, u8 *pmk)
4556 {
4557 if (!sm)
4558 return;
4559
4560 sm->pmksa = pmksa;
4561 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
4562 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
4563 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
4564 }
4565
4566
4567 /*
4568 * Remove and free the group from wpa_authenticator. This is triggered by a
4569 * callback to make sure nobody is currently iterating the group list while it
4570 * gets modified.
4571 */
wpa_group_free(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4572 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
4573 struct wpa_group *group)
4574 {
4575 struct wpa_group *prev = wpa_auth->group;
4576
4577 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
4578 group->vlan_id);
4579
4580 while (prev) {
4581 if (prev->next == group) {
4582 /* This never frees the special first group as needed */
4583 prev->next = group->next;
4584 os_free(group);
4585 break;
4586 }
4587 prev = prev->next;
4588 }
4589
4590 }
4591
4592
4593 /* Increase the reference counter for group */
wpa_group_get(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4594 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
4595 struct wpa_group *group)
4596 {
4597 /* Skip the special first group */
4598 if (wpa_auth->group == group)
4599 return;
4600
4601 group->references++;
4602 }
4603
4604
4605 /* Decrease the reference counter and maybe free the group */
wpa_group_put(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4606 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
4607 struct wpa_group *group)
4608 {
4609 /* Skip the special first group */
4610 if (wpa_auth->group == group)
4611 return;
4612
4613 group->references--;
4614 if (group->references)
4615 return;
4616 wpa_group_free(wpa_auth, group);
4617 }
4618
4619
4620 /*
4621 * Add a group that has its references counter set to zero. Caller needs to
4622 * call wpa_group_get() on the return value to mark the entry in use.
4623 */
4624 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)4625 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4626 {
4627 struct wpa_group *group;
4628
4629 if (wpa_auth == NULL || wpa_auth->group == NULL)
4630 return NULL;
4631
4632 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
4633 vlan_id);
4634 group = wpa_group_init(wpa_auth, vlan_id, 0);
4635 if (group == NULL)
4636 return NULL;
4637
4638 group->next = wpa_auth->group->next;
4639 wpa_auth->group->next = group;
4640
4641 return group;
4642 }
4643
4644
4645 /*
4646 * Enforce that the group state machine for the VLAN is running, increase
4647 * reference counter as interface is up. References might have been increased
4648 * even if a negative value is returned.
4649 * Returns: -1 on error (group missing, group already failed); otherwise, 0
4650 */
wpa_auth_ensure_group(struct wpa_authenticator * wpa_auth,int vlan_id)4651 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4652 {
4653 struct wpa_group *group;
4654
4655 if (wpa_auth == NULL)
4656 return 0;
4657
4658 group = wpa_auth->group;
4659 while (group) {
4660 if (group->vlan_id == vlan_id)
4661 break;
4662 group = group->next;
4663 }
4664
4665 if (group == NULL) {
4666 group = wpa_auth_add_group(wpa_auth, vlan_id);
4667 if (group == NULL)
4668 return -1;
4669 }
4670
4671 wpa_printf(MSG_DEBUG,
4672 "WPA: Ensure group state machine running for VLAN ID %d",
4673 vlan_id);
4674
4675 wpa_group_get(wpa_auth, group);
4676 group->num_setup_iface++;
4677
4678 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4679 return -1;
4680
4681 return 0;
4682 }
4683
4684
4685 /*
4686 * Decrease reference counter, expected to be zero afterwards.
4687 * returns: -1 on error (group not found, group in fail state)
4688 * -2 if wpa_group is still referenced
4689 * 0 else
4690 */
wpa_auth_release_group(struct wpa_authenticator * wpa_auth,int vlan_id)4691 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4692 {
4693 struct wpa_group *group;
4694 int ret = 0;
4695
4696 if (wpa_auth == NULL)
4697 return 0;
4698
4699 group = wpa_auth->group;
4700 while (group) {
4701 if (group->vlan_id == vlan_id)
4702 break;
4703 group = group->next;
4704 }
4705
4706 if (group == NULL)
4707 return -1;
4708
4709 wpa_printf(MSG_DEBUG,
4710 "WPA: Try stopping group state machine for VLAN ID %d",
4711 vlan_id);
4712
4713 if (group->num_setup_iface <= 0) {
4714 wpa_printf(MSG_ERROR,
4715 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
4716 vlan_id);
4717 return -1;
4718 }
4719 group->num_setup_iface--;
4720
4721 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4722 ret = -1;
4723
4724 if (group->references > 1) {
4725 wpa_printf(MSG_DEBUG,
4726 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
4727 vlan_id);
4728 ret = -2;
4729 }
4730
4731 wpa_group_put(wpa_auth, group);
4732
4733 return ret;
4734 }
4735
4736
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)4737 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
4738 {
4739 struct wpa_group *group;
4740
4741 if (sm == NULL || sm->wpa_auth == NULL)
4742 return 0;
4743
4744 group = sm->wpa_auth->group;
4745 while (group) {
4746 if (group->vlan_id == vlan_id)
4747 break;
4748 group = group->next;
4749 }
4750
4751 if (group == NULL) {
4752 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
4753 if (group == NULL)
4754 return -1;
4755 }
4756
4757 if (sm->group == group)
4758 return 0;
4759
4760 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4761 return -1;
4762
4763 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
4764 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
4765
4766 wpa_group_get(sm->wpa_auth, group);
4767 wpa_group_put(sm->wpa_auth, sm->group);
4768 sm->group = group;
4769
4770 return 0;
4771 }
4772
4773
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)4774 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
4775 struct wpa_state_machine *sm, int ack)
4776 {
4777 if (wpa_auth == NULL || sm == NULL)
4778 return;
4779 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
4780 " ack=%d", MAC2STR(sm->addr), ack);
4781 if (sm->pending_1_of_4_timeout && ack) {
4782 /*
4783 * Some deployed supplicant implementations update their SNonce
4784 * for each EAPOL-Key 2/4 message even within the same 4-way
4785 * handshake and then fail to use the first SNonce when
4786 * deriving the PTK. This results in unsuccessful 4-way
4787 * handshake whenever the relatively short initial timeout is
4788 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
4789 * around this by increasing the timeout now that we know that
4790 * the station has received the frame.
4791 */
4792 int timeout_ms = eapol_key_timeout_subseq;
4793 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
4794 "timeout by %u ms because of acknowledged frame",
4795 timeout_ms);
4796 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
4797 eloop_register_timeout(timeout_ms / 1000,
4798 (timeout_ms % 1000) * 1000,
4799 wpa_send_eapol_timeout, wpa_auth, sm);
4800 }
4801
4802 #ifdef CONFIG_TESTING_OPTIONS
4803 if (sm->eapol_status_cb) {
4804 sm->eapol_status_cb(sm->eapol_status_cb_ctx1,
4805 sm->eapol_status_cb_ctx2);
4806 sm->eapol_status_cb = NULL;
4807 }
4808 #endif /* CONFIG_TESTING_OPTIONS */
4809 }
4810
4811
wpa_auth_uses_sae(struct wpa_state_machine * sm)4812 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
4813 {
4814 if (sm == NULL)
4815 return 0;
4816 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
4817 }
4818
4819
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)4820 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
4821 {
4822 if (sm == NULL)
4823 return 0;
4824 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
4825 }
4826
4827
4828 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)4829 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
4830 {
4831 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
4832 return -1;
4833 os_memcpy(addr, sm->ip_addr, 4);
4834 return 0;
4835 }
4836 #endif /* CONFIG_P2P */
4837
4838
wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator * wpa_auth,struct radius_das_attrs * attr)4839 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
4840 struct radius_das_attrs *attr)
4841 {
4842 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
4843 }
4844
4845
wpa_auth_reconfig_group_keys(struct wpa_authenticator * wpa_auth)4846 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
4847 {
4848 struct wpa_group *group;
4849
4850 if (!wpa_auth)
4851 return;
4852 for (group = wpa_auth->group; group; group = group->next)
4853 wpa_group_config_group_keys(wpa_auth, group);
4854 }
4855
4856
4857 #ifdef CONFIG_FILS
4858
4859 struct wpa_auth_fils_iter_data {
4860 struct wpa_authenticator *auth;
4861 const u8 *cache_id;
4862 struct rsn_pmksa_cache_entry *pmksa;
4863 const u8 *spa;
4864 const u8 *pmkid;
4865 };
4866
4867
wpa_auth_fils_iter(struct wpa_authenticator * a,void * ctx)4868 static int wpa_auth_fils_iter(struct wpa_authenticator *a, void *ctx)
4869 {
4870 struct wpa_auth_fils_iter_data *data = ctx;
4871
4872 if (a == data->auth || !a->conf.fils_cache_id_set ||
4873 os_memcmp(a->conf.fils_cache_id, data->cache_id,
4874 FILS_CACHE_ID_LEN) != 0)
4875 return 0;
4876 data->pmksa = pmksa_cache_auth_get(a->pmksa, data->spa, data->pmkid);
4877 return data->pmksa != NULL;
4878 }
4879
4880
4881 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_get_fils_cache_id(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * pmkid)4882 wpa_auth_pmksa_get_fils_cache_id(struct wpa_authenticator *wpa_auth,
4883 const u8 *sta_addr, const u8 *pmkid)
4884 {
4885 struct wpa_auth_fils_iter_data idata;
4886
4887 if (!wpa_auth->conf.fils_cache_id_set)
4888 return NULL;
4889 idata.auth = wpa_auth;
4890 idata.cache_id = wpa_auth->conf.fils_cache_id;
4891 idata.pmksa = NULL;
4892 idata.spa = sta_addr;
4893 idata.pmkid = pmkid;
4894 wpa_auth_for_each_auth(wpa_auth, wpa_auth_fils_iter, &idata);
4895 return idata.pmksa;
4896 }
4897
4898
4899 #ifdef CONFIG_IEEE80211R_AP
wpa_auth_write_fte(struct wpa_authenticator * wpa_auth,int use_sha384,u8 * buf,size_t len)4900 int wpa_auth_write_fte(struct wpa_authenticator *wpa_auth, int use_sha384,
4901 u8 *buf, size_t len)
4902 {
4903 struct wpa_auth_config *conf = &wpa_auth->conf;
4904
4905 return wpa_write_ftie(conf, use_sha384, conf->r0_key_holder,
4906 conf->r0_key_holder_len,
4907 NULL, NULL, buf, len, NULL, 0);
4908 }
4909 #endif /* CONFIG_IEEE80211R_AP */
4910
4911
wpa_auth_get_fils_aead_params(struct wpa_state_machine * sm,u8 * fils_anonce,u8 * fils_snonce,u8 * fils_kek,size_t * fils_kek_len)4912 void wpa_auth_get_fils_aead_params(struct wpa_state_machine *sm,
4913 u8 *fils_anonce, u8 *fils_snonce,
4914 u8 *fils_kek, size_t *fils_kek_len)
4915 {
4916 os_memcpy(fils_anonce, sm->ANonce, WPA_NONCE_LEN);
4917 os_memcpy(fils_snonce, sm->SNonce, WPA_NONCE_LEN);
4918 os_memcpy(fils_kek, sm->PTK.kek, WPA_KEK_MAX_LEN);
4919 *fils_kek_len = sm->PTK.kek_len;
4920 }
4921
4922
wpa_auth_add_fils_pmk_pmkid(struct wpa_state_machine * sm,const u8 * pmk,size_t pmk_len,const u8 * pmkid)4923 void wpa_auth_add_fils_pmk_pmkid(struct wpa_state_machine *sm, const u8 *pmk,
4924 size_t pmk_len, const u8 *pmkid)
4925 {
4926 os_memcpy(sm->PMK, pmk, pmk_len);
4927 sm->pmk_len = pmk_len;
4928 os_memcpy(sm->pmkid, pmkid, PMKID_LEN);
4929 sm->pmkid_set = 1;
4930 }
4931
4932 #endif /* CONFIG_FILS */
4933
4934
wpa_auth_set_auth_alg(struct wpa_state_machine * sm,u16 auth_alg)4935 void wpa_auth_set_auth_alg(struct wpa_state_machine *sm, u16 auth_alg)
4936 {
4937 if (sm)
4938 sm->auth_alg = auth_alg;
4939 }
4940
4941
4942 #ifdef CONFIG_DPP2
wpa_auth_set_dpp_z(struct wpa_state_machine * sm,const struct wpabuf * z)4943 void wpa_auth_set_dpp_z(struct wpa_state_machine *sm, const struct wpabuf *z)
4944 {
4945 if (sm) {
4946 wpabuf_clear_free(sm->dpp_z);
4947 sm->dpp_z = z ? wpabuf_dup(z) : NULL;
4948 }
4949 }
4950 #endif /* CONFIG_DPP2 */
4951
4952
4953 #ifdef CONFIG_TESTING_OPTIONS
4954
wpa_auth_resend_m1(struct wpa_state_machine * sm,int change_anonce,void (* cb)(void * ctx1,void * ctx2),void * ctx1,void * ctx2)4955 int wpa_auth_resend_m1(struct wpa_state_machine *sm, int change_anonce,
4956 void (*cb)(void *ctx1, void *ctx2),
4957 void *ctx1, void *ctx2)
4958 {
4959 const u8 *anonce = sm->ANonce;
4960 u8 anonce_buf[WPA_NONCE_LEN];
4961
4962 if (change_anonce) {
4963 if (random_get_bytes(anonce_buf, WPA_NONCE_LEN))
4964 return -1;
4965 anonce = anonce_buf;
4966 }
4967
4968 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
4969 "sending 1/4 msg of 4-Way Handshake (TESTING)");
4970 wpa_send_eapol(sm->wpa_auth, sm,
4971 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
4972 anonce, NULL, 0, 0, 0);
4973 return 0;
4974 }
4975
4976
wpa_auth_resend_m3(struct wpa_state_machine * sm,void (* cb)(void * ctx1,void * ctx2),void * ctx1,void * ctx2)4977 int wpa_auth_resend_m3(struct wpa_state_machine *sm,
4978 void (*cb)(void *ctx1, void *ctx2),
4979 void *ctx1, void *ctx2)
4980 {
4981 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos;
4982 #ifdef CONFIG_IEEE80211W
4983 u8 *opos;
4984 #endif /* CONFIG_IEEE80211W */
4985 size_t gtk_len, kde_len;
4986 struct wpa_group *gsm = sm->group;
4987 u8 *wpa_ie;
4988 int wpa_ie_len, secure, keyidx, encr = 0;
4989
4990 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
4991 GTK[GN], IGTK, [FTIE], [TIE * 2])
4992 */
4993
4994 /* Use 0 RSC */
4995 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
4996 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
4997 wpa_ie = sm->wpa_auth->wpa_ie;
4998 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
4999 if (sm->wpa == WPA_VERSION_WPA &&
5000 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
5001 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
5002 /* WPA-only STA, remove RSN IE and possible MDIE */
5003 wpa_ie = wpa_ie + wpa_ie[1] + 2;
5004 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
5005 wpa_ie = wpa_ie + wpa_ie[1] + 2;
5006 wpa_ie_len = wpa_ie[1] + 2;
5007 }
5008 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
5009 "sending 3/4 msg of 4-Way Handshake (TESTING)");
5010 if (sm->wpa == WPA_VERSION_WPA2) {
5011 /* WPA2 send GTK in the 4-way handshake */
5012 secure = 1;
5013 gtk = gsm->GTK[gsm->GN - 1];
5014 gtk_len = gsm->GTK_len;
5015 keyidx = gsm->GN;
5016 _rsc = rsc;
5017 encr = 1;
5018 } else {
5019 /* WPA does not include GTK in msg 3/4 */
5020 secure = 0;
5021 gtk = NULL;
5022 gtk_len = 0;
5023 keyidx = 0;
5024 _rsc = NULL;
5025 if (sm->rx_eapol_key_secure) {
5026 /*
5027 * It looks like Windows 7 supplicant tries to use
5028 * Secure bit in msg 2/4 after having reported Michael
5029 * MIC failure and it then rejects the 4-way handshake
5030 * if msg 3/4 does not set Secure bit. Work around this
5031 * by setting the Secure bit here even in the case of
5032 * WPA if the supplicant used it first.
5033 */
5034 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
5035 "STA used Secure bit in WPA msg 2/4 - "
5036 "set Secure for 3/4 as workaround");
5037 secure = 1;
5038 }
5039 }
5040
5041 kde_len = wpa_ie_len + ieee80211w_kde_len(sm) + ocv_oci_len(sm);
5042 if (gtk)
5043 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
5044 #ifdef CONFIG_IEEE80211R_AP
5045 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
5046 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
5047 kde_len += 300; /* FTIE + 2 * TIE */
5048 }
5049 #endif /* CONFIG_IEEE80211R_AP */
5050 kde = os_malloc(kde_len);
5051 if (kde == NULL)
5052 return -1;
5053
5054 pos = kde;
5055 os_memcpy(pos, wpa_ie, wpa_ie_len);
5056 pos += wpa_ie_len;
5057 #ifdef CONFIG_IEEE80211R_AP
5058 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
5059 int res;
5060 size_t elen;
5061
5062 elen = pos - kde;
5063 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
5064 if (res < 0) {
5065 wpa_printf(MSG_ERROR, "FT: Failed to insert "
5066 "PMKR1Name into RSN IE in EAPOL-Key data");
5067 os_free(kde);
5068 return -1;
5069 }
5070 pos -= wpa_ie_len;
5071 pos += elen;
5072 }
5073 #endif /* CONFIG_IEEE80211R_AP */
5074 if (gtk) {
5075 u8 hdr[2];
5076 hdr[0] = keyidx & 0x03;
5077 hdr[1] = 0;
5078 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
5079 gtk, gtk_len);
5080 }
5081 #ifdef CONFIG_IEEE80211W
5082 opos = pos;
5083 pos = ieee80211w_kde_add(sm, pos);
5084 if (pos - opos >= 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN) {
5085 /* skip KDE header and keyid */
5086 opos += 2 + RSN_SELECTOR_LEN + 2;
5087 os_memset(opos, 0, 6); /* clear PN */
5088 }
5089 #endif /* CONFIG_IEEE80211W */
5090 if (ocv_oci_add(sm, &pos) < 0) {
5091 os_free(kde);
5092 return -1;
5093 }
5094
5095 #ifdef CONFIG_IEEE80211R_AP
5096 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
5097 int res;
5098 struct wpa_auth_config *conf;
5099
5100 conf = &sm->wpa_auth->conf;
5101 if (sm->assoc_resp_ftie &&
5102 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
5103 os_memcpy(pos, sm->assoc_resp_ftie,
5104 2 + sm->assoc_resp_ftie[1]);
5105 res = 2 + sm->assoc_resp_ftie[1];
5106 } else {
5107 int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
5108
5109 res = wpa_write_ftie(conf, use_sha384,
5110 conf->r0_key_holder,
5111 conf->r0_key_holder_len,
5112 NULL, NULL, pos,
5113 kde + kde_len - pos,
5114 NULL, 0);
5115 }
5116 if (res < 0) {
5117 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
5118 "into EAPOL-Key Key Data");
5119 os_free(kde);
5120 return -1;
5121 }
5122 pos += res;
5123
5124 /* TIE[ReassociationDeadline] (TU) */
5125 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
5126 *pos++ = 5;
5127 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
5128 WPA_PUT_LE32(pos, conf->reassociation_deadline);
5129 pos += 4;
5130
5131 /* TIE[KeyLifetime] (seconds) */
5132 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
5133 *pos++ = 5;
5134 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
5135 WPA_PUT_LE32(pos, conf->r0_key_lifetime);
5136 pos += 4;
5137 }
5138 #endif /* CONFIG_IEEE80211R_AP */
5139
5140 wpa_send_eapol(sm->wpa_auth, sm,
5141 (secure ? WPA_KEY_INFO_SECURE : 0) |
5142 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
5143 WPA_KEY_INFO_MIC : 0) |
5144 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
5145 WPA_KEY_INFO_KEY_TYPE,
5146 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
5147 os_free(kde);
5148 return 0;
5149 }
5150
5151
wpa_auth_resend_group_m1(struct wpa_state_machine * sm,void (* cb)(void * ctx1,void * ctx2),void * ctx1,void * ctx2)5152 int wpa_auth_resend_group_m1(struct wpa_state_machine *sm,
5153 void (*cb)(void *ctx1, void *ctx2),
5154 void *ctx1, void *ctx2)
5155 {
5156 u8 rsc[WPA_KEY_RSC_LEN];
5157 struct wpa_group *gsm = sm->group;
5158 const u8 *kde;
5159 u8 *kde_buf = NULL, *pos, hdr[2];
5160 #ifdef CONFIG_IEEE80211W
5161 u8 *opos;
5162 #endif /* CONFIG_IEEE80211W */
5163 size_t kde_len;
5164 u8 *gtk;
5165
5166 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
5167 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
5168 /* Use 0 RSC */
5169 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
5170 "sending 1/2 msg of Group Key Handshake (TESTING)");
5171
5172 gtk = gsm->GTK[gsm->GN - 1];
5173 if (sm->wpa == WPA_VERSION_WPA2) {
5174 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
5175 ieee80211w_kde_len(sm) + ocv_oci_len(sm);
5176 kde_buf = os_malloc(kde_len);
5177 if (kde_buf == NULL)
5178 return -1;
5179
5180 kde = pos = kde_buf;
5181 hdr[0] = gsm->GN & 0x03;
5182 hdr[1] = 0;
5183 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
5184 gtk, gsm->GTK_len);
5185 #ifdef CONFIG_IEEE80211W
5186 opos = pos;
5187 pos = ieee80211w_kde_add(sm, pos);
5188 if (pos - opos >=
5189 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN) {
5190 /* skip KDE header and keyid */
5191 opos += 2 + RSN_SELECTOR_LEN + 2;
5192 os_memset(opos, 0, 6); /* clear PN */
5193 }
5194 #endif /* CONFIG_IEEE80211W */
5195 if (ocv_oci_add(sm, &pos) < 0) {
5196 os_free(kde_buf);
5197 return -1;
5198 }
5199 kde_len = pos - kde;
5200 } else {
5201 kde = gtk;
5202 kde_len = gsm->GTK_len;
5203 }
5204
5205 sm->eapol_status_cb = cb;
5206 sm->eapol_status_cb_ctx1 = ctx1;
5207 sm->eapol_status_cb_ctx2 = ctx2;
5208
5209 wpa_send_eapol(sm->wpa_auth, sm,
5210 WPA_KEY_INFO_SECURE |
5211 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
5212 WPA_KEY_INFO_MIC : 0) |
5213 WPA_KEY_INFO_ACK |
5214 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
5215 rsc, NULL, kde, kde_len, gsm->GN, 1);
5216
5217 os_free(kde_buf);
5218 return 0;
5219 }
5220
5221
wpa_auth_rekey_gtk(struct wpa_authenticator * wpa_auth)5222 int wpa_auth_rekey_gtk(struct wpa_authenticator *wpa_auth)
5223 {
5224 if (!wpa_auth)
5225 return -1;
5226 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
5227 return eloop_register_timeout(0, 0, wpa_rekey_gtk, wpa_auth, NULL);
5228 }
5229
5230 #endif /* CONFIG_TESTING_OPTIONS */
5231