1 /*
2 * WPA Supplicant - WPA state machine and EAPOL-Key processing
3 * Copyright (c) 2003-2012, 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 "includes.h"
10
11 #include "common.h"
12 #include "crypto/aes_wrap.h"
13 #include "crypto/crypto.h"
14 #include "crypto/random.h"
15 #include "common/ieee802_11_defs.h"
16 #include "eapol_supp/eapol_supp_sm.h"
17 #include "wpa.h"
18 #include "eloop.h"
19 #include "preauth.h"
20 #include "pmksa_cache.h"
21 #include "wpa_i.h"
22 #include "wpa_ie.h"
23 #include "peerkey.h"
24
25
26 /**
27 * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message
28 * @sm: Pointer to WPA state machine data from wpa_sm_init()
29 * @kck: Key Confirmation Key (KCK, part of PTK)
30 * @ver: Version field from Key Info
31 * @dest: Destination address for the frame
32 * @proto: Ethertype (usually ETH_P_EAPOL)
33 * @msg: EAPOL-Key message
34 * @msg_len: Length of message
35 * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written
36 */
wpa_eapol_key_send(struct wpa_sm * sm,const u8 * kck,int ver,const u8 * dest,u16 proto,u8 * msg,size_t msg_len,u8 * key_mic)37 void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck,
38 int ver, const u8 *dest, u16 proto,
39 u8 *msg, size_t msg_len, u8 *key_mic)
40 {
41 if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) {
42 /*
43 * Association event was not yet received; try to fetch
44 * BSSID from the driver.
45 */
46 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) {
47 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
48 "WPA: Failed to read BSSID for "
49 "EAPOL-Key destination address");
50 } else {
51 dest = sm->bssid;
52 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
53 "WPA: Use BSSID (" MACSTR
54 ") as the destination for EAPOL-Key",
55 MAC2STR(dest));
56 }
57 }
58 if (key_mic &&
59 wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic)) {
60 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
61 "WPA: Failed to generate EAPOL-Key "
62 "version %d MIC", ver);
63 goto out;
64 }
65 wpa_hexdump_key(MSG_DEBUG, "WPA: KCK", kck, 16);
66 wpa_hexdump(MSG_DEBUG, "WPA: Derived Key MIC", key_mic, 16);
67 wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len);
68 wpa_sm_ether_send(sm, dest, proto, msg, msg_len);
69 eapol_sm_notify_tx_eapol_key(sm->eapol);
70 out:
71 os_free(msg);
72 }
73
74
75 /**
76 * wpa_sm_key_request - Send EAPOL-Key Request
77 * @sm: Pointer to WPA state machine data from wpa_sm_init()
78 * @error: Indicate whether this is an Michael MIC error report
79 * @pairwise: 1 = error report for pairwise packet, 0 = for group packet
80 *
81 * Send an EAPOL-Key Request to the current authenticator. This function is
82 * used to request rekeying and it is usually called when a local Michael MIC
83 * failure is detected.
84 */
wpa_sm_key_request(struct wpa_sm * sm,int error,int pairwise)85 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
86 {
87 size_t rlen;
88 struct wpa_eapol_key *reply;
89 int key_info, ver;
90 u8 bssid[ETH_ALEN], *rbuf;
91
92 if (wpa_key_mgmt_ft(sm->key_mgmt) || wpa_key_mgmt_sha256(sm->key_mgmt))
93 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
94 else if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
95 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
96 else
97 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
98
99 if (wpa_sm_get_bssid(sm, bssid) < 0) {
100 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
101 "Failed to read BSSID for EAPOL-Key request");
102 return;
103 }
104
105 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
106 sizeof(*reply), &rlen, (void *) &reply);
107 if (rbuf == NULL)
108 return;
109
110 reply->type = sm->proto == WPA_PROTO_RSN ?
111 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
112 key_info = WPA_KEY_INFO_REQUEST | ver;
113 if (sm->ptk_set)
114 key_info |= WPA_KEY_INFO_MIC;
115 if (error)
116 key_info |= WPA_KEY_INFO_ERROR;
117 if (pairwise)
118 key_info |= WPA_KEY_INFO_KEY_TYPE;
119 WPA_PUT_BE16(reply->key_info, key_info);
120 WPA_PUT_BE16(reply->key_length, 0);
121 os_memcpy(reply->replay_counter, sm->request_counter,
122 WPA_REPLAY_COUNTER_LEN);
123 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
124
125 WPA_PUT_BE16(reply->key_data_length, 0);
126
127 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
128 "WPA: Sending EAPOL-Key Request (error=%d "
129 "pairwise=%d ptk_set=%d len=%lu)",
130 error, pairwise, sm->ptk_set, (unsigned long) rlen);
131 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
132 rbuf, rlen, key_info & WPA_KEY_INFO_MIC ?
133 reply->key_mic : NULL);
134 }
135
136
wpa_supplicant_get_pmk(struct wpa_sm * sm,const unsigned char * src_addr,const u8 * pmkid)137 static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
138 const unsigned char *src_addr,
139 const u8 *pmkid)
140 {
141 int abort_cached = 0;
142
143 if (pmkid && !sm->cur_pmksa) {
144 /* When using drivers that generate RSN IE, wpa_supplicant may
145 * not have enough time to get the association information
146 * event before receiving this 1/4 message, so try to find a
147 * matching PMKSA cache entry here. */
148 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid,
149 NULL);
150 if (sm->cur_pmksa) {
151 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
152 "RSN: found matching PMKID from PMKSA cache");
153 } else {
154 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
155 "RSN: no matching PMKID found");
156 abort_cached = 1;
157 }
158 }
159
160 if (pmkid && sm->cur_pmksa &&
161 os_memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
162 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
163 wpa_sm_set_pmk_from_pmksa(sm);
164 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
165 sm->pmk, sm->pmk_len);
166 eapol_sm_notify_cached(sm->eapol);
167 #ifdef CONFIG_IEEE80211R
168 sm->xxkey_len = 0;
169 #endif /* CONFIG_IEEE80211R */
170 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
171 int res, pmk_len;
172 pmk_len = PMK_LEN;
173 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN);
174 if (res) {
175 /*
176 * EAP-LEAP is an exception from other EAP methods: it
177 * uses only 16-byte PMK.
178 */
179 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
180 pmk_len = 16;
181 } else {
182 #ifdef CONFIG_IEEE80211R
183 u8 buf[2 * PMK_LEN];
184 if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
185 {
186 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
187 sm->xxkey_len = PMK_LEN;
188 os_memset(buf, 0, sizeof(buf));
189 }
190 #endif /* CONFIG_IEEE80211R */
191 }
192 if (res == 0) {
193 struct rsn_pmksa_cache_entry *sa = NULL;
194 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
195 "machines", sm->pmk, pmk_len);
196 sm->pmk_len = pmk_len;
197 if (sm->proto == WPA_PROTO_RSN &&
198 !wpa_key_mgmt_ft(sm->key_mgmt)) {
199 sa = pmksa_cache_add(sm->pmksa,
200 sm->pmk, pmk_len,
201 src_addr, sm->own_addr,
202 sm->network_ctx,
203 sm->key_mgmt);
204 }
205 if (!sm->cur_pmksa && pmkid &&
206 pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL))
207 {
208 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
209 "RSN: the new PMK matches with the "
210 "PMKID");
211 abort_cached = 0;
212 }
213
214 if (!sm->cur_pmksa)
215 sm->cur_pmksa = sa;
216 } else {
217 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
218 "WPA: Failed to get master session key from "
219 "EAPOL state machines - key handshake "
220 "aborted");
221 if (sm->cur_pmksa) {
222 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
223 "RSN: Cancelled PMKSA caching "
224 "attempt");
225 sm->cur_pmksa = NULL;
226 abort_cached = 1;
227 } else if (!abort_cached) {
228 return -1;
229 }
230 }
231 }
232
233 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) &&
234 !wpa_key_mgmt_ft(sm->key_mgmt)) {
235 /* Send EAPOL-Start to trigger full EAP authentication. */
236 u8 *buf;
237 size_t buflen;
238
239 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
240 "RSN: no PMKSA entry found - trigger "
241 "full EAP authentication");
242 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
243 NULL, 0, &buflen, NULL);
244 if (buf) {
245 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
246 buf, buflen);
247 os_free(buf);
248 return -2;
249 }
250
251 return -1;
252 }
253
254 return 0;
255 }
256
257
258 /**
259 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
260 * @sm: Pointer to WPA state machine data from wpa_sm_init()
261 * @dst: Destination address for the frame
262 * @key: Pointer to the EAPOL-Key frame header
263 * @ver: Version bits from EAPOL-Key Key Info
264 * @nonce: Nonce value for the EAPOL-Key frame
265 * @wpa_ie: WPA/RSN IE
266 * @wpa_ie_len: Length of the WPA/RSN IE
267 * @ptk: PTK to use for keyed hash and encryption
268 * Returns: 0 on success, -1 on failure
269 */
wpa_supplicant_send_2_of_4(struct wpa_sm * sm,const unsigned char * dst,const struct wpa_eapol_key * key,int ver,const u8 * nonce,const u8 * wpa_ie,size_t wpa_ie_len,struct wpa_ptk * ptk)270 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
271 const struct wpa_eapol_key *key,
272 int ver, const u8 *nonce,
273 const u8 *wpa_ie, size_t wpa_ie_len,
274 struct wpa_ptk *ptk)
275 {
276 size_t rlen;
277 struct wpa_eapol_key *reply;
278 u8 *rbuf;
279 u8 *rsn_ie_buf = NULL;
280
281 if (wpa_ie == NULL) {
282 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No wpa_ie set - "
283 "cannot generate msg 2/4");
284 return -1;
285 }
286
287 #ifdef CONFIG_IEEE80211R
288 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
289 int res;
290
291 /*
292 * Add PMKR1Name into RSN IE (PMKID-List) and add MDIE and
293 * FTIE from (Re)Association Response.
294 */
295 rsn_ie_buf = os_malloc(wpa_ie_len + 2 + 2 + PMKID_LEN +
296 sm->assoc_resp_ies_len);
297 if (rsn_ie_buf == NULL)
298 return -1;
299 os_memcpy(rsn_ie_buf, wpa_ie, wpa_ie_len);
300 res = wpa_insert_pmkid(rsn_ie_buf, wpa_ie_len,
301 sm->pmk_r1_name);
302 if (res < 0) {
303 os_free(rsn_ie_buf);
304 return -1;
305 }
306 wpa_ie_len += res;
307
308 if (sm->assoc_resp_ies) {
309 os_memcpy(rsn_ie_buf + wpa_ie_len, sm->assoc_resp_ies,
310 sm->assoc_resp_ies_len);
311 wpa_ie_len += sm->assoc_resp_ies_len;
312 }
313
314 wpa_ie = rsn_ie_buf;
315 }
316 #endif /* CONFIG_IEEE80211R */
317
318 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
319
320 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
321 NULL, sizeof(*reply) + wpa_ie_len,
322 &rlen, (void *) &reply);
323 if (rbuf == NULL) {
324 os_free(rsn_ie_buf);
325 return -1;
326 }
327
328 reply->type = sm->proto == WPA_PROTO_RSN ?
329 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
330 WPA_PUT_BE16(reply->key_info,
331 ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC);
332 if (sm->proto == WPA_PROTO_RSN)
333 WPA_PUT_BE16(reply->key_length, 0);
334 else
335 os_memcpy(reply->key_length, key->key_length, 2);
336 os_memcpy(reply->replay_counter, key->replay_counter,
337 WPA_REPLAY_COUNTER_LEN);
338 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter,
339 WPA_REPLAY_COUNTER_LEN);
340
341 WPA_PUT_BE16(reply->key_data_length, wpa_ie_len);
342 os_memcpy(reply + 1, wpa_ie, wpa_ie_len);
343 os_free(rsn_ie_buf);
344
345 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
346
347 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
348 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
349 rbuf, rlen, reply->key_mic);
350
351 return 0;
352 }
353
354
wpa_derive_ptk(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)355 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
356 const struct wpa_eapol_key *key,
357 struct wpa_ptk *ptk)
358 {
359 size_t ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
360 #ifdef CONFIG_IEEE80211R
361 if (wpa_key_mgmt_ft(sm->key_mgmt))
362 return wpa_derive_ptk_ft(sm, src_addr, key, ptk, ptk_len);
363 #endif /* CONFIG_IEEE80211R */
364
365 wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
366 sm->own_addr, sm->bssid, sm->snonce, key->key_nonce,
367 (u8 *) ptk, ptk_len,
368 wpa_key_mgmt_sha256(sm->key_mgmt));
369 return 0;
370 }
371
372
wpa_supplicant_process_1_of_4(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,u16 ver)373 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
374 const unsigned char *src_addr,
375 const struct wpa_eapol_key *key,
376 u16 ver)
377 {
378 struct wpa_eapol_ie_parse ie;
379 struct wpa_ptk *ptk;
380 u8 buf[8];
381 int res;
382
383 if (wpa_sm_get_network_ctx(sm) == NULL) {
384 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No SSID info "
385 "found (msg 1 of 4)");
386 return;
387 }
388
389 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
390 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of 4-Way "
391 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
392
393 os_memset(&ie, 0, sizeof(ie));
394
395 #ifndef CONFIG_NO_WPA2
396 if (sm->proto == WPA_PROTO_RSN) {
397 /* RSN: msg 1/4 should contain PMKID for the selected PMK */
398 const u8 *_buf = (const u8 *) (key + 1);
399 size_t len = WPA_GET_BE16(key->key_data_length);
400 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len);
401 if (wpa_supplicant_parse_ies(_buf, len, &ie) < 0)
402 goto failed;
403 if (ie.pmkid) {
404 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
405 "Authenticator", ie.pmkid, PMKID_LEN);
406 }
407 }
408 #endif /* CONFIG_NO_WPA2 */
409
410 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid);
411 if (res == -2) {
412 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to "
413 "msg 1/4 - requesting full EAP authentication");
414 return;
415 }
416 if (res)
417 goto failed;
418
419 if (sm->renew_snonce) {
420 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
421 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
422 "WPA: Failed to get random data for SNonce");
423 goto failed;
424 }
425 sm->renew_snonce = 0;
426 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
427 sm->snonce, WPA_NONCE_LEN);
428 }
429
430 /* Calculate PTK which will be stored as a temporary PTK until it has
431 * been verified when processing message 3/4. */
432 ptk = &sm->tptk;
433 wpa_derive_ptk(sm, src_addr, key, ptk);
434 /* Supplicant: swap tx/rx Mic keys */
435 os_memcpy(buf, ptk->u.auth.tx_mic_key, 8);
436 os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8);
437 os_memcpy(ptk->u.auth.rx_mic_key, buf, 8);
438 sm->tptk_set = 1;
439
440 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
441 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len,
442 ptk))
443 goto failed;
444
445 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
446 return;
447
448 failed:
449 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
450 }
451
452
wpa_sm_start_preauth(void * eloop_ctx,void * timeout_ctx)453 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
454 {
455 struct wpa_sm *sm = eloop_ctx;
456 rsn_preauth_candidate_process(sm);
457 }
458
459
wpa_supplicant_key_neg_complete(struct wpa_sm * sm,const u8 * addr,int secure)460 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
461 const u8 *addr, int secure)
462 {
463 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
464 "WPA: Key negotiation completed with "
465 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
466 wpa_cipher_txt(sm->pairwise_cipher),
467 wpa_cipher_txt(sm->group_cipher));
468 wpa_sm_cancel_auth_timeout(sm);
469 wpa_sm_set_state(sm, WPA_COMPLETED);
470
471 if (secure) {
472 wpa_sm_mlme_setprotection(
473 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
474 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
475 eapol_sm_notify_portValid(sm->eapol, TRUE);
476 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt))
477 eapol_sm_notify_eap_success(sm->eapol, TRUE);
478 /*
479 * Start preauthentication after a short wait to avoid a
480 * possible race condition between the data receive and key
481 * configuration after the 4-Way Handshake. This increases the
482 * likelihood of the first preauth EAPOL-Start frame getting to
483 * the target AP.
484 */
485 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
486 }
487
488 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
489 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
490 "RSN: Authenticator accepted "
491 "opportunistic PMKSA entry - marking it valid");
492 sm->cur_pmksa->opportunistic = 0;
493 }
494
495 #ifdef CONFIG_IEEE80211R
496 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
497 /* Prepare for the next transition */
498 wpa_ft_prepare_auth_request(sm, NULL);
499 }
500 #endif /* CONFIG_IEEE80211R */
501 }
502
503
wpa_sm_rekey_ptk(void * eloop_ctx,void * timeout_ctx)504 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
505 {
506 struct wpa_sm *sm = eloop_ctx;
507 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Request PTK rekeying");
508 wpa_sm_key_request(sm, 0, 1);
509 }
510
511
wpa_supplicant_install_ptk(struct wpa_sm * sm,const struct wpa_eapol_key * key)512 static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
513 const struct wpa_eapol_key *key)
514 {
515 int keylen, rsclen;
516 enum wpa_alg alg;
517 const u8 *key_rsc;
518 u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
519
520 if (sm->ptk_installed) {
521 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
522 "WPA: Do not re-install same PTK to the driver");
523 return 0;
524 }
525
526 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
527 "WPA: Installing PTK to the driver");
528
529 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
530 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher "
531 "Suite: NONE - do not use pairwise keys");
532 return 0;
533 }
534
535 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
536 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
537 "WPA: Unsupported pairwise cipher %d",
538 sm->pairwise_cipher);
539 return -1;
540 }
541
542 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
543 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
544 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher);
545
546 if (sm->proto == WPA_PROTO_RSN) {
547 key_rsc = null_rsc;
548 } else {
549 key_rsc = key->key_rsc;
550 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
551 }
552
553 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
554 (u8 *) sm->ptk.tk1, keylen) < 0) {
555 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
556 "WPA: Failed to set PTK to the "
557 "driver (alg=%d keylen=%d bssid=" MACSTR ")",
558 alg, keylen, MAC2STR(sm->bssid));
559 return -1;
560 }
561
562 sm->ptk_installed = 1;
563
564 if (sm->wpa_ptk_rekey) {
565 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
566 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
567 sm, NULL);
568 }
569
570 return 0;
571 }
572
573
wpa_supplicant_check_group_cipher(struct wpa_sm * sm,int group_cipher,int keylen,int maxkeylen,int * key_rsc_len,enum wpa_alg * alg)574 static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm,
575 int group_cipher,
576 int keylen, int maxkeylen,
577 int *key_rsc_len,
578 enum wpa_alg *alg)
579 {
580 int klen;
581
582 *alg = wpa_cipher_to_alg(group_cipher);
583 if (*alg == WPA_ALG_NONE) {
584 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
585 "WPA: Unsupported Group Cipher %d",
586 group_cipher);
587 return -1;
588 }
589 *key_rsc_len = wpa_cipher_rsc_len(group_cipher);
590
591 klen = wpa_cipher_key_len(group_cipher);
592 if (keylen != klen || maxkeylen < klen) {
593 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
594 "WPA: Unsupported %s Group Cipher key length %d (%d)",
595 wpa_cipher_txt(group_cipher), keylen, maxkeylen);
596 return -1;
597 }
598 return 0;
599 }
600
601
602 struct wpa_gtk_data {
603 enum wpa_alg alg;
604 int tx, key_rsc_len, keyidx;
605 u8 gtk[32];
606 int gtk_len;
607 };
608
609
wpa_supplicant_install_gtk(struct wpa_sm * sm,const struct wpa_gtk_data * gd,const u8 * key_rsc,int wnm_sleep)610 static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
611 const struct wpa_gtk_data *gd,
612 const u8 *key_rsc, int wnm_sleep)
613 {
614 const u8 *_gtk = gd->gtk;
615 u8 gtk_buf[32];
616
617 /* Detect possible key reinstallation */
618 if ((sm->gtk.gtk_len == (size_t) gd->gtk_len &&
619 os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) ||
620 (sm->gtk_wnm_sleep.gtk_len == (size_t) gd->gtk_len &&
621 os_memcmp(sm->gtk_wnm_sleep.gtk, gd->gtk,
622 sm->gtk_wnm_sleep.gtk_len) == 0)) {
623 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
624 "WPA: Not reinstalling already in-use GTK to the driver (keyidx=%d tx=%d len=%d)",
625 gd->keyidx, gd->tx, gd->gtk_len);
626 return 0;
627 }
628
629 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
630 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
631 "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)",
632 gd->keyidx, gd->tx, gd->gtk_len);
633 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
634 if (sm->group_cipher == WPA_CIPHER_TKIP) {
635 /* Swap Tx/Rx keys for Michael MIC */
636 os_memcpy(gtk_buf, gd->gtk, 16);
637 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
638 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
639 _gtk = gtk_buf;
640 }
641 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
642 if (wpa_sm_set_key(sm, gd->alg, NULL,
643 gd->keyidx, 1, key_rsc, gd->key_rsc_len,
644 _gtk, gd->gtk_len) < 0) {
645 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
646 "WPA: Failed to set GTK to the driver "
647 "(Group only)");
648 return -1;
649 }
650 } else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr,
651 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
652 _gtk, gd->gtk_len) < 0) {
653 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
654 "WPA: Failed to set GTK to "
655 "the driver (alg=%d keylen=%d keyidx=%d)",
656 gd->alg, gd->gtk_len, gd->keyidx);
657 return -1;
658 }
659
660 if (wnm_sleep) {
661 sm->gtk_wnm_sleep.gtk_len = gd->gtk_len;
662 os_memcpy(sm->gtk_wnm_sleep.gtk, gd->gtk,
663 sm->gtk_wnm_sleep.gtk_len);
664 } else {
665 sm->gtk.gtk_len = gd->gtk_len;
666 os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len);
667 }
668
669 return 0;
670 }
671
672
wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm * sm,int tx)673 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
674 int tx)
675 {
676 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
677 /* Ignore Tx bit for GTK if a pairwise key is used. One AP
678 * seemed to set this bit (incorrectly, since Tx is only when
679 * doing Group Key only APs) and without this workaround, the
680 * data connection does not work because wpa_supplicant
681 * configured non-zero keyidx to be used for unicast. */
682 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
683 "WPA: Tx bit set for GTK, but pairwise "
684 "keys are used - ignore Tx bit");
685 return 0;
686 }
687 return tx;
688 }
689
690
wpa_supplicant_pairwise_gtk(struct wpa_sm * sm,const struct wpa_eapol_key * key,const u8 * gtk,size_t gtk_len,int key_info)691 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
692 const struct wpa_eapol_key *key,
693 const u8 *gtk, size_t gtk_len,
694 int key_info)
695 {
696 #ifndef CONFIG_NO_WPA2
697 struct wpa_gtk_data gd;
698
699 /*
700 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
701 * GTK KDE format:
702 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
703 * Reserved [bits 0-7]
704 * GTK
705 */
706
707 os_memset(&gd, 0, sizeof(gd));
708 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
709 gtk, gtk_len);
710
711 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
712 return -1;
713
714 gd.keyidx = gtk[0] & 0x3;
715 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
716 !!(gtk[0] & BIT(2)));
717 gtk += 2;
718 gtk_len -= 2;
719
720 os_memcpy(gd.gtk, gtk, gtk_len);
721 gd.gtk_len = gtk_len;
722
723 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
724 gtk_len, gtk_len,
725 &gd.key_rsc_len, &gd.alg) ||
726 wpa_supplicant_install_gtk(sm, &gd, key->key_rsc, 0)) {
727 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
728 "RSN: Failed to install GTK");
729 return -1;
730 }
731
732 wpa_supplicant_key_neg_complete(sm, sm->bssid,
733 key_info & WPA_KEY_INFO_SECURE);
734 return 0;
735 #else /* CONFIG_NO_WPA2 */
736 return -1;
737 #endif /* CONFIG_NO_WPA2 */
738 }
739
740
741 #ifdef CONFIG_IEEE80211W
wpa_supplicant_install_igtk(struct wpa_sm * sm,const struct wpa_igtk_kde * igtk,int wnm_sleep)742 static int wpa_supplicant_install_igtk(struct wpa_sm *sm,
743 const struct wpa_igtk_kde *igtk,
744 int wnm_sleep)
745 {
746 size_t len = WPA_IGTK_LEN;
747 u16 keyidx = WPA_GET_LE16(igtk->keyid);
748
749 /* Detect possible key reinstallation */
750 if ((sm->igtk.igtk_len == len &&
751 os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) ||
752 (sm->igtk_wnm_sleep.igtk_len == len &&
753 os_memcmp(sm->igtk_wnm_sleep.igtk, igtk->igtk,
754 sm->igtk_wnm_sleep.igtk_len) == 0)) {
755 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
756 "WPA: Not reinstalling already in-use IGTK to the driver (keyidx=%d)",
757 keyidx);
758 return 0;
759 }
760
761 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
762 "WPA: IGTK keyid %d pn %02x%02x%02x%02x%02x%02x",
763 keyidx, MAC2STR(igtk->pn));
764 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", igtk->igtk, len);
765 if (keyidx > 4095) {
766 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
767 "WPA: Invalid IGTK KeyID %d", keyidx);
768 return -1;
769 }
770 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr,
771 keyidx, 0, igtk->pn, sizeof(igtk->pn),
772 igtk->igtk, WPA_IGTK_LEN) < 0) {
773 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
774 "WPA: Failed to configure IGTK to the driver");
775 return -1;
776 }
777
778 if (wnm_sleep) {
779 sm->igtk_wnm_sleep.igtk_len = len;
780 os_memcpy(sm->igtk_wnm_sleep.igtk, igtk->igtk,
781 sm->igtk_wnm_sleep.igtk_len);
782 } else {
783 sm->igtk.igtk_len = len;
784 os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len);
785 }
786
787 return 0;
788 }
789 #endif /* CONFIG_IEEE80211W */
790
791
ieee80211w_set_keys(struct wpa_sm * sm,struct wpa_eapol_ie_parse * ie)792 static int ieee80211w_set_keys(struct wpa_sm *sm,
793 struct wpa_eapol_ie_parse *ie)
794 {
795 #ifdef CONFIG_IEEE80211W
796 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
797 return 0;
798
799 if (ie->igtk) {
800 const struct wpa_igtk_kde *igtk;
801 if (ie->igtk_len != sizeof(*igtk))
802 return -1;
803
804 igtk = (const struct wpa_igtk_kde *) ie->igtk;
805 if (wpa_supplicant_install_igtk(sm, igtk, 0) < 0)
806 return -1;
807 }
808
809 return 0;
810 #else /* CONFIG_IEEE80211W */
811 return 0;
812 #endif /* CONFIG_IEEE80211W */
813 }
814
815
wpa_report_ie_mismatch(struct wpa_sm * sm,const char * reason,const u8 * src_addr,const u8 * wpa_ie,size_t wpa_ie_len,const u8 * rsn_ie,size_t rsn_ie_len)816 static void wpa_report_ie_mismatch(struct wpa_sm *sm,
817 const char *reason, const u8 *src_addr,
818 const u8 *wpa_ie, size_t wpa_ie_len,
819 const u8 *rsn_ie, size_t rsn_ie_len)
820 {
821 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
822 reason, MAC2STR(src_addr));
823
824 if (sm->ap_wpa_ie) {
825 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
826 sm->ap_wpa_ie, sm->ap_wpa_ie_len);
827 }
828 if (wpa_ie) {
829 if (!sm->ap_wpa_ie) {
830 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
831 "WPA: No WPA IE in Beacon/ProbeResp");
832 }
833 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
834 wpa_ie, wpa_ie_len);
835 }
836
837 if (sm->ap_rsn_ie) {
838 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
839 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
840 }
841 if (rsn_ie) {
842 if (!sm->ap_rsn_ie) {
843 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
844 "WPA: No RSN IE in Beacon/ProbeResp");
845 }
846 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
847 rsn_ie, rsn_ie_len);
848 }
849
850 wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
851 }
852
853
854 #ifdef CONFIG_IEEE80211R
855
ft_validate_mdie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie,const u8 * assoc_resp_mdie)856 static int ft_validate_mdie(struct wpa_sm *sm,
857 const unsigned char *src_addr,
858 struct wpa_eapol_ie_parse *ie,
859 const u8 *assoc_resp_mdie)
860 {
861 struct rsn_mdie *mdie;
862
863 mdie = (struct rsn_mdie *) (ie->mdie + 2);
864 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
865 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
866 MOBILITY_DOMAIN_ID_LEN) != 0) {
867 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did "
868 "not match with the current mobility domain");
869 return -1;
870 }
871
872 if (assoc_resp_mdie &&
873 (assoc_resp_mdie[1] != ie->mdie[1] ||
874 os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) {
875 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch");
876 wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4",
877 ie->mdie, 2 + ie->mdie[1]);
878 wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response",
879 assoc_resp_mdie, 2 + assoc_resp_mdie[1]);
880 return -1;
881 }
882
883 return 0;
884 }
885
886
ft_validate_ftie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie,const u8 * assoc_resp_ftie)887 static int ft_validate_ftie(struct wpa_sm *sm,
888 const unsigned char *src_addr,
889 struct wpa_eapol_ie_parse *ie,
890 const u8 *assoc_resp_ftie)
891 {
892 if (ie->ftie == NULL) {
893 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
894 "FT: No FTIE in EAPOL-Key msg 3/4");
895 return -1;
896 }
897
898 if (assoc_resp_ftie == NULL)
899 return 0;
900
901 if (assoc_resp_ftie[1] != ie->ftie[1] ||
902 os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) {
903 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch");
904 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4",
905 ie->ftie, 2 + ie->ftie[1]);
906 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response",
907 assoc_resp_ftie, 2 + assoc_resp_ftie[1]);
908 return -1;
909 }
910
911 return 0;
912 }
913
914
ft_validate_rsnie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)915 static int ft_validate_rsnie(struct wpa_sm *sm,
916 const unsigned char *src_addr,
917 struct wpa_eapol_ie_parse *ie)
918 {
919 struct wpa_ie_data rsn;
920
921 if (!ie->rsn_ie)
922 return 0;
923
924 /*
925 * Verify that PMKR1Name from EAPOL-Key message 3/4
926 * matches with the value we derived.
927 */
928 if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 ||
929 rsn.num_pmkid != 1 || rsn.pmkid == NULL) {
930 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in "
931 "FT 4-way handshake message 3/4");
932 return -1;
933 }
934
935 if (os_memcmp(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) {
936 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
937 "FT: PMKR1Name mismatch in "
938 "FT 4-way handshake message 3/4");
939 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator",
940 rsn.pmkid, WPA_PMK_NAME_LEN);
941 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
942 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
943 return -1;
944 }
945
946 return 0;
947 }
948
949
wpa_supplicant_validate_ie_ft(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)950 static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm,
951 const unsigned char *src_addr,
952 struct wpa_eapol_ie_parse *ie)
953 {
954 const u8 *pos, *end, *mdie = NULL, *ftie = NULL;
955
956 if (sm->assoc_resp_ies) {
957 pos = sm->assoc_resp_ies;
958 end = pos + sm->assoc_resp_ies_len;
959 while (pos + 2 < end) {
960 if (pos + 2 + pos[1] > end)
961 break;
962 switch (*pos) {
963 case WLAN_EID_MOBILITY_DOMAIN:
964 mdie = pos;
965 break;
966 case WLAN_EID_FAST_BSS_TRANSITION:
967 ftie = pos;
968 break;
969 }
970 pos += 2 + pos[1];
971 }
972 }
973
974 if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 ||
975 ft_validate_ftie(sm, src_addr, ie, ftie) < 0 ||
976 ft_validate_rsnie(sm, src_addr, ie) < 0)
977 return -1;
978
979 return 0;
980 }
981
982 #endif /* CONFIG_IEEE80211R */
983
984
wpa_supplicant_validate_ie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)985 static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
986 const unsigned char *src_addr,
987 struct wpa_eapol_ie_parse *ie)
988 {
989 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
990 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
991 "WPA: No WPA/RSN IE for this AP known. "
992 "Trying to get from scan results");
993 if (wpa_sm_get_beacon_ie(sm) < 0) {
994 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
995 "WPA: Could not find AP from "
996 "the scan results");
997 } else {
998 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
999 "WPA: Found the current AP from "
1000 "updated scan results");
1001 }
1002 }
1003
1004 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
1005 (sm->ap_wpa_ie || sm->ap_rsn_ie)) {
1006 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
1007 "with IE in Beacon/ProbeResp (no IE?)",
1008 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1009 ie->rsn_ie, ie->rsn_ie_len);
1010 return -1;
1011 }
1012
1013 if ((ie->wpa_ie && sm->ap_wpa_ie &&
1014 (ie->wpa_ie_len != sm->ap_wpa_ie_len ||
1015 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
1016 (ie->rsn_ie && sm->ap_rsn_ie &&
1017 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
1018 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
1019 ie->rsn_ie, ie->rsn_ie_len))) {
1020 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
1021 "with IE in Beacon/ProbeResp",
1022 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1023 ie->rsn_ie, ie->rsn_ie_len);
1024 return -1;
1025 }
1026
1027 if (sm->proto == WPA_PROTO_WPA &&
1028 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
1029 wpa_report_ie_mismatch(sm, "Possible downgrade attack "
1030 "detected - RSN was enabled and RSN IE "
1031 "was in msg 3/4, but not in "
1032 "Beacon/ProbeResp",
1033 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1034 ie->rsn_ie, ie->rsn_ie_len);
1035 return -1;
1036 }
1037
1038 #ifdef CONFIG_IEEE80211R
1039 if (wpa_key_mgmt_ft(sm->key_mgmt) &&
1040 wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0)
1041 return -1;
1042 #endif /* CONFIG_IEEE80211R */
1043
1044 return 0;
1045 }
1046
1047
1048 /**
1049 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
1050 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1051 * @dst: Destination address for the frame
1052 * @key: Pointer to the EAPOL-Key frame header
1053 * @ver: Version bits from EAPOL-Key Key Info
1054 * @key_info: Key Info
1055 * @kde: KDEs to include the EAPOL-Key frame
1056 * @kde_len: Length of KDEs
1057 * @ptk: PTK to use for keyed hash and encryption
1058 * Returns: 0 on success, -1 on failure
1059 */
wpa_supplicant_send_4_of_4(struct wpa_sm * sm,const unsigned char * dst,const struct wpa_eapol_key * key,u16 ver,u16 key_info,const u8 * kde,size_t kde_len,struct wpa_ptk * ptk)1060 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
1061 const struct wpa_eapol_key *key,
1062 u16 ver, u16 key_info,
1063 const u8 *kde, size_t kde_len,
1064 struct wpa_ptk *ptk)
1065 {
1066 size_t rlen;
1067 struct wpa_eapol_key *reply;
1068 u8 *rbuf;
1069
1070 if (kde)
1071 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len);
1072
1073 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1074 sizeof(*reply) + kde_len,
1075 &rlen, (void *) &reply);
1076 if (rbuf == NULL)
1077 return -1;
1078
1079 reply->type = sm->proto == WPA_PROTO_RSN ?
1080 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1081 key_info &= WPA_KEY_INFO_SECURE;
1082 key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC;
1083 WPA_PUT_BE16(reply->key_info, key_info);
1084 if (sm->proto == WPA_PROTO_RSN)
1085 WPA_PUT_BE16(reply->key_length, 0);
1086 else
1087 os_memcpy(reply->key_length, key->key_length, 2);
1088 os_memcpy(reply->replay_counter, key->replay_counter,
1089 WPA_REPLAY_COUNTER_LEN);
1090
1091 WPA_PUT_BE16(reply->key_data_length, kde_len);
1092 if (kde)
1093 os_memcpy(reply + 1, kde, kde_len);
1094
1095 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
1096 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
1097 rbuf, rlen, reply->key_mic);
1098
1099 return 0;
1100 }
1101
1102
wpa_supplicant_process_3_of_4(struct wpa_sm * sm,const struct wpa_eapol_key * key,u16 ver)1103 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
1104 const struct wpa_eapol_key *key,
1105 u16 ver)
1106 {
1107 u16 key_info, keylen, len;
1108 const u8 *pos;
1109 struct wpa_eapol_ie_parse ie;
1110
1111 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
1112 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way "
1113 "Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
1114
1115 key_info = WPA_GET_BE16(key->key_info);
1116
1117 pos = (const u8 *) (key + 1);
1118 len = WPA_GET_BE16(key->key_data_length);
1119 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len);
1120 if (wpa_supplicant_parse_ies(pos, len, &ie) < 0)
1121 goto failed;
1122 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1123 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1124 "WPA: GTK IE in unencrypted key data");
1125 goto failed;
1126 }
1127 #ifdef CONFIG_IEEE80211W
1128 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1129 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1130 "WPA: IGTK KDE in unencrypted key data");
1131 goto failed;
1132 }
1133
1134 if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) {
1135 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1136 "WPA: Invalid IGTK KDE length %lu",
1137 (unsigned long) ie.igtk_len);
1138 goto failed;
1139 }
1140 #endif /* CONFIG_IEEE80211W */
1141
1142 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
1143 goto failed;
1144
1145 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
1146 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1147 "WPA: ANonce from message 1 of 4-Way Handshake "
1148 "differs from 3 of 4-Way Handshake - drop packet (src="
1149 MACSTR ")", MAC2STR(sm->bssid));
1150 goto failed;
1151 }
1152
1153 keylen = WPA_GET_BE16(key->key_length);
1154 if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) {
1155 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1156 "WPA: Invalid %s key length %d (src=" MACSTR
1157 ")", wpa_cipher_txt(sm->pairwise_cipher), keylen,
1158 MAC2STR(sm->bssid));
1159 goto failed;
1160 }
1161
1162 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
1163 NULL, 0, &sm->ptk)) {
1164 goto failed;
1165 }
1166
1167 /* SNonce was successfully used in msg 3/4, so mark it to be renewed
1168 * for the next 4-Way Handshake. If msg 3 is received again, the old
1169 * SNonce will still be used to avoid changing PTK. */
1170 sm->renew_snonce = 1;
1171
1172 if (key_info & WPA_KEY_INFO_INSTALL) {
1173 if (wpa_supplicant_install_ptk(sm, key))
1174 goto failed;
1175 }
1176
1177 if (key_info & WPA_KEY_INFO_SECURE) {
1178 wpa_sm_mlme_setprotection(
1179 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
1180 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
1181 eapol_sm_notify_portValid(sm->eapol, TRUE);
1182 }
1183 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1184
1185 if (ie.gtk &&
1186 wpa_supplicant_pairwise_gtk(sm, key,
1187 ie.gtk, ie.gtk_len, key_info) < 0) {
1188 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1189 "RSN: Failed to configure GTK");
1190 goto failed;
1191 }
1192
1193 if (ieee80211w_set_keys(sm, &ie) < 0) {
1194 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1195 "RSN: Failed to configure IGTK");
1196 goto failed;
1197 }
1198
1199 wpa_sm_set_rekey_offload(sm);
1200
1201 return;
1202
1203 failed:
1204 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1205 }
1206
1207
wpa_supplicant_process_1_of_2_rsn(struct wpa_sm * sm,const u8 * keydata,size_t keydatalen,u16 key_info,struct wpa_gtk_data * gd)1208 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
1209 const u8 *keydata,
1210 size_t keydatalen,
1211 u16 key_info,
1212 struct wpa_gtk_data *gd)
1213 {
1214 int maxkeylen;
1215 struct wpa_eapol_ie_parse ie;
1216
1217 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen);
1218 if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0)
1219 return -1;
1220 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1221 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1222 "WPA: GTK IE in unencrypted key data");
1223 return -1;
1224 }
1225 if (ie.gtk == NULL) {
1226 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1227 "WPA: No GTK IE in Group Key msg 1/2");
1228 return -1;
1229 }
1230 maxkeylen = gd->gtk_len = ie.gtk_len - 2;
1231
1232 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
1233 gd->gtk_len, maxkeylen,
1234 &gd->key_rsc_len, &gd->alg))
1235 return -1;
1236
1237 wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake",
1238 ie.gtk, ie.gtk_len);
1239 gd->keyidx = ie.gtk[0] & 0x3;
1240 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
1241 !!(ie.gtk[0] & BIT(2)));
1242 if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
1243 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1244 "RSN: Too long GTK in GTK IE (len=%lu)",
1245 (unsigned long) ie.gtk_len - 2);
1246 return -1;
1247 }
1248 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
1249
1250 if (ieee80211w_set_keys(sm, &ie) < 0)
1251 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1252 "RSN: Failed to configure IGTK");
1253
1254 return 0;
1255 }
1256
1257
wpa_supplicant_process_1_of_2_wpa(struct wpa_sm * sm,const struct wpa_eapol_key * key,size_t keydatalen,int key_info,size_t extra_len,u16 ver,struct wpa_gtk_data * gd)1258 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
1259 const struct wpa_eapol_key *key,
1260 size_t keydatalen, int key_info,
1261 size_t extra_len, u16 ver,
1262 struct wpa_gtk_data *gd)
1263 {
1264 size_t maxkeylen;
1265 u8 ek[32];
1266
1267 gd->gtk_len = WPA_GET_BE16(key->key_length);
1268 maxkeylen = keydatalen;
1269 if (keydatalen > extra_len) {
1270 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1271 "WPA: Truncated EAPOL-Key packet: "
1272 "key_data_length=%lu > extra_len=%lu",
1273 (unsigned long) keydatalen, (unsigned long) extra_len);
1274 return -1;
1275 }
1276 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1277 if (maxkeylen < 8) {
1278 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1279 "WPA: Too short maxkeylen (%lu)",
1280 (unsigned long) maxkeylen);
1281 return -1;
1282 }
1283 maxkeylen -= 8;
1284 }
1285
1286 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
1287 gd->gtk_len, maxkeylen,
1288 &gd->key_rsc_len, &gd->alg))
1289 return -1;
1290
1291 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1292 WPA_KEY_INFO_KEY_INDEX_SHIFT;
1293 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1294 os_memcpy(ek, key->key_iv, 16);
1295 os_memcpy(ek + 16, sm->ptk.kek, 16);
1296 if (keydatalen > sizeof(gd->gtk)) {
1297 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1298 "WPA: RC4 key data too long (%lu)",
1299 (unsigned long) keydatalen);
1300 return -1;
1301 }
1302 os_memcpy(gd->gtk, key + 1, keydatalen);
1303 if (rc4_skip(ek, 32, 256, gd->gtk, keydatalen)) {
1304 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1305 "WPA: RC4 failed");
1306 return -1;
1307 }
1308 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1309 if (keydatalen % 8) {
1310 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1311 "WPA: Unsupported AES-WRAP len %lu",
1312 (unsigned long) keydatalen);
1313 return -1;
1314 }
1315 if (maxkeylen > sizeof(gd->gtk)) {
1316 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1317 "WPA: AES-WRAP key data "
1318 "too long (keydatalen=%lu maxkeylen=%lu)",
1319 (unsigned long) keydatalen,
1320 (unsigned long) maxkeylen);
1321 return -1;
1322 }
1323 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8,
1324 (const u8 *) (key + 1), gd->gtk)) {
1325 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1326 "WPA: AES unwrap failed - could not decrypt "
1327 "GTK");
1328 return -1;
1329 }
1330 } else {
1331 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1332 "WPA: Unsupported key_info type %d", ver);
1333 return -1;
1334 }
1335 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1336 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1337 return 0;
1338 }
1339
1340
wpa_supplicant_send_2_of_2(struct wpa_sm * sm,const struct wpa_eapol_key * key,int ver,u16 key_info)1341 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1342 const struct wpa_eapol_key *key,
1343 int ver, u16 key_info)
1344 {
1345 size_t rlen;
1346 struct wpa_eapol_key *reply;
1347 u8 *rbuf;
1348
1349 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1350 sizeof(*reply), &rlen, (void *) &reply);
1351 if (rbuf == NULL)
1352 return -1;
1353
1354 reply->type = sm->proto == WPA_PROTO_RSN ?
1355 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1356 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1357 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
1358 WPA_PUT_BE16(reply->key_info, key_info);
1359 if (sm->proto == WPA_PROTO_RSN)
1360 WPA_PUT_BE16(reply->key_length, 0);
1361 else
1362 os_memcpy(reply->key_length, key->key_length, 2);
1363 os_memcpy(reply->replay_counter, key->replay_counter,
1364 WPA_REPLAY_COUNTER_LEN);
1365
1366 WPA_PUT_BE16(reply->key_data_length, 0);
1367
1368 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1369 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL,
1370 rbuf, rlen, reply->key_mic);
1371
1372 return 0;
1373 }
1374
1375
wpa_supplicant_process_1_of_2(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,int extra_len,u16 ver)1376 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1377 const unsigned char *src_addr,
1378 const struct wpa_eapol_key *key,
1379 int extra_len, u16 ver)
1380 {
1381 u16 key_info, keydatalen;
1382 int rekey, ret;
1383 struct wpa_gtk_data gd;
1384
1385 os_memset(&gd, 0, sizeof(gd));
1386
1387 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1388 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key "
1389 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1390
1391 key_info = WPA_GET_BE16(key->key_info);
1392 keydatalen = WPA_GET_BE16(key->key_data_length);
1393
1394 if (sm->proto == WPA_PROTO_RSN) {
1395 ret = wpa_supplicant_process_1_of_2_rsn(sm,
1396 (const u8 *) (key + 1),
1397 keydatalen, key_info,
1398 &gd);
1399 } else {
1400 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen,
1401 key_info, extra_len,
1402 ver, &gd);
1403 }
1404
1405 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1406
1407 if (ret)
1408 goto failed;
1409
1410 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc, 0) ||
1411 wpa_supplicant_send_2_of_2(sm, key, ver, key_info))
1412 goto failed;
1413
1414 if (rekey) {
1415 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Group rekeying "
1416 "completed with " MACSTR " [GTK=%s]",
1417 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1418 wpa_sm_cancel_auth_timeout(sm);
1419 wpa_sm_set_state(sm, WPA_COMPLETED);
1420
1421 wpa_sm_set_rekey_offload(sm);
1422 } else {
1423 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1424 key_info &
1425 WPA_KEY_INFO_SECURE);
1426 }
1427 return;
1428
1429 failed:
1430 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1431 }
1432
1433
wpa_supplicant_verify_eapol_key_mic(struct wpa_sm * sm,struct wpa_eapol_key * key,u16 ver,const u8 * buf,size_t len)1434 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1435 struct wpa_eapol_key *key,
1436 u16 ver,
1437 const u8 *buf, size_t len)
1438 {
1439 u8 mic[16];
1440 int ok = 0;
1441
1442 os_memcpy(mic, key->key_mic, 16);
1443 if (sm->tptk_set) {
1444 os_memset(key->key_mic, 0, 16);
1445 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len,
1446 key->key_mic);
1447 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1448 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1449 "WPA: Invalid EAPOL-Key MIC "
1450 "when using TPTK - ignoring TPTK");
1451 } else {
1452 ok = 1;
1453 sm->tptk_set = 0;
1454 sm->ptk_set = 1;
1455 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1456 }
1457 }
1458
1459 if (!ok && sm->ptk_set) {
1460 os_memset(key->key_mic, 0, 16);
1461 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len,
1462 key->key_mic);
1463 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1464 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1465 "WPA: Invalid EAPOL-Key MIC - "
1466 "dropping packet");
1467 return -1;
1468 }
1469 ok = 1;
1470 }
1471
1472 if (!ok) {
1473 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1474 "WPA: Could not verify EAPOL-Key MIC - "
1475 "dropping packet");
1476 return -1;
1477 }
1478
1479 os_memcpy(sm->rx_replay_counter, key->replay_counter,
1480 WPA_REPLAY_COUNTER_LEN);
1481 sm->rx_replay_counter_set = 1;
1482 return 0;
1483 }
1484
1485
1486 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
wpa_supplicant_decrypt_key_data(struct wpa_sm * sm,struct wpa_eapol_key * key,u16 ver)1487 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1488 struct wpa_eapol_key *key, u16 ver)
1489 {
1490 u16 keydatalen = WPA_GET_BE16(key->key_data_length);
1491
1492 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1493 (u8 *) (key + 1), keydatalen);
1494 if (!sm->ptk_set) {
1495 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1496 "WPA: PTK not available, cannot decrypt EAPOL-Key Key "
1497 "Data");
1498 return -1;
1499 }
1500
1501 /* Decrypt key data here so that this operation does not need
1502 * to be implemented separately for each message type. */
1503 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1504 u8 ek[32];
1505 os_memcpy(ek, key->key_iv, 16);
1506 os_memcpy(ek + 16, sm->ptk.kek, 16);
1507 if (rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen)) {
1508 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1509 "WPA: RC4 failed");
1510 return -1;
1511 }
1512 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1513 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1514 u8 *buf;
1515 if (keydatalen % 8) {
1516 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1517 "WPA: Unsupported AES-WRAP len %d",
1518 keydatalen);
1519 return -1;
1520 }
1521 keydatalen -= 8; /* AES-WRAP adds 8 bytes */
1522 buf = os_malloc(keydatalen);
1523 if (buf == NULL) {
1524 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1525 "WPA: No memory for AES-UNWRAP buffer");
1526 return -1;
1527 }
1528 if (aes_unwrap(sm->ptk.kek, keydatalen / 8,
1529 (u8 *) (key + 1), buf)) {
1530 os_free(buf);
1531 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1532 "WPA: AES unwrap failed - "
1533 "could not decrypt EAPOL-Key key data");
1534 return -1;
1535 }
1536 os_memcpy(key + 1, buf, keydatalen);
1537 os_free(buf);
1538 WPA_PUT_BE16(key->key_data_length, keydatalen);
1539 } else {
1540 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1541 "WPA: Unsupported key_info type %d", ver);
1542 return -1;
1543 }
1544 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1545 (u8 *) (key + 1), keydatalen);
1546 return 0;
1547 }
1548
1549
1550 /**
1551 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1552 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1553 */
wpa_sm_aborted_cached(struct wpa_sm * sm)1554 void wpa_sm_aborted_cached(struct wpa_sm *sm)
1555 {
1556 if (sm && sm->cur_pmksa) {
1557 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1558 "RSN: Cancelling PMKSA caching attempt");
1559 sm->cur_pmksa = NULL;
1560 }
1561 }
1562
1563
wpa_eapol_key_dump(struct wpa_sm * sm,const struct wpa_eapol_key * key)1564 static void wpa_eapol_key_dump(struct wpa_sm *sm,
1565 const struct wpa_eapol_key *key)
1566 {
1567 #ifndef CONFIG_NO_STDOUT_DEBUG
1568 u16 key_info = WPA_GET_BE16(key->key_info);
1569
1570 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type);
1571 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1572 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)",
1573 key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1574 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1575 WPA_KEY_INFO_KEY_INDEX_SHIFT,
1576 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1577 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1578 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1579 key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1580 key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1581 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1582 key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1583 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1584 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1585 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1586 " key_length=%u key_data_length=%u",
1587 WPA_GET_BE16(key->key_length),
1588 WPA_GET_BE16(key->key_data_length));
1589 wpa_hexdump(MSG_DEBUG, " replay_counter",
1590 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1591 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN);
1592 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16);
1593 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8);
1594 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8);
1595 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16);
1596 #endif /* CONFIG_NO_STDOUT_DEBUG */
1597 }
1598
1599
1600 /**
1601 * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1602 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1603 * @src_addr: Source MAC address of the EAPOL packet
1604 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1605 * @len: Length of the EAPOL frame
1606 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1607 *
1608 * This function is called for each received EAPOL frame. Other than EAPOL-Key
1609 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1610 * only processing WPA and WPA2 EAPOL-Key frames.
1611 *
1612 * The received EAPOL-Key packets are validated and valid packets are replied
1613 * to. In addition, key material (PTK, GTK) is configured at the end of a
1614 * successful key handshake.
1615 */
wpa_sm_rx_eapol(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1616 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1617 const u8 *buf, size_t len)
1618 {
1619 size_t plen, data_len, extra_len;
1620 struct ieee802_1x_hdr *hdr;
1621 struct wpa_eapol_key *key;
1622 u16 key_info, ver;
1623 u8 *tmp;
1624 int ret = -1;
1625 struct wpa_peerkey *peerkey = NULL;
1626
1627 #ifdef CONFIG_IEEE80211R
1628 sm->ft_completed = 0;
1629 #endif /* CONFIG_IEEE80211R */
1630
1631 if (len < sizeof(*hdr) + sizeof(*key)) {
1632 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1633 "WPA: EAPOL frame too short to be a WPA "
1634 "EAPOL-Key (len %lu, expecting at least %lu)",
1635 (unsigned long) len,
1636 (unsigned long) sizeof(*hdr) + sizeof(*key));
1637 return 0;
1638 }
1639
1640 tmp = os_malloc(len);
1641 if (tmp == NULL)
1642 return -1;
1643 os_memcpy(tmp, buf, len);
1644
1645 hdr = (struct ieee802_1x_hdr *) tmp;
1646 key = (struct wpa_eapol_key *) (hdr + 1);
1647 plen = be_to_host16(hdr->length);
1648 data_len = plen + sizeof(*hdr);
1649 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1650 "IEEE 802.1X RX: version=%d type=%d length=%lu",
1651 hdr->version, hdr->type, (unsigned long) plen);
1652
1653 if (hdr->version < EAPOL_VERSION) {
1654 /* TODO: backwards compatibility */
1655 }
1656 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1657 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1658 "WPA: EAPOL frame (type %u) discarded, "
1659 "not a Key frame", hdr->type);
1660 ret = 0;
1661 goto out;
1662 }
1663 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
1664 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1665 "WPA: EAPOL frame payload size %lu "
1666 "invalid (frame size %lu)",
1667 (unsigned long) plen, (unsigned long) len);
1668 ret = 0;
1669 goto out;
1670 }
1671
1672 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1673 {
1674 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1675 "WPA: EAPOL-Key type (%d) unknown, discarded",
1676 key->type);
1677 ret = 0;
1678 goto out;
1679 }
1680 wpa_eapol_key_dump(sm, key);
1681
1682 eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1683 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len);
1684 if (data_len < len) {
1685 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1686 "WPA: ignoring %lu bytes after the IEEE 802.1X data",
1687 (unsigned long) len - data_len);
1688 }
1689 key_info = WPA_GET_BE16(key->key_info);
1690 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1691 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1692 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
1693 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1694 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
1695 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1696 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1697 "WPA: Unsupported EAPOL-Key descriptor version %d",
1698 ver);
1699 goto out;
1700 }
1701
1702 #ifdef CONFIG_IEEE80211R
1703 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
1704 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
1705 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1706 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1707 "FT: AP did not use AES-128-CMAC");
1708 goto out;
1709 }
1710 } else
1711 #endif /* CONFIG_IEEE80211R */
1712 #ifdef CONFIG_IEEE80211W
1713 if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
1714 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1715 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1716 "WPA: AP did not use the "
1717 "negotiated AES-128-CMAC");
1718 goto out;
1719 }
1720 } else
1721 #endif /* CONFIG_IEEE80211W */
1722 if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
1723 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1724 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1725 "WPA: CCMP is used, but EAPOL-Key "
1726 "descriptor version (%d) is not 2", ver);
1727 if (sm->group_cipher != WPA_CIPHER_CCMP &&
1728 !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1729 /* Earlier versions of IEEE 802.11i did not explicitly
1730 * require version 2 descriptor for all EAPOL-Key
1731 * packets, so allow group keys to use version 1 if
1732 * CCMP is not used for them. */
1733 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1734 "WPA: Backwards compatibility: allow invalid "
1735 "version for non-CCMP group keys");
1736 } else
1737 goto out;
1738 }
1739 if (sm->pairwise_cipher == WPA_CIPHER_GCMP &&
1740 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1741 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1742 "WPA: GCMP is used, but EAPOL-Key "
1743 "descriptor version (%d) is not 2", ver);
1744 goto out;
1745 }
1746
1747 #ifdef CONFIG_PEERKEY
1748 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
1749 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
1750 break;
1751 }
1752
1753 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
1754 if (!peerkey->initiator && peerkey->replay_counter_set &&
1755 os_memcmp(key->replay_counter, peerkey->replay_counter,
1756 WPA_REPLAY_COUNTER_LEN) <= 0) {
1757 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1758 "RSN: EAPOL-Key Replay Counter did not "
1759 "increase (STK) - dropping packet");
1760 goto out;
1761 } else if (peerkey->initiator) {
1762 u8 _tmp[WPA_REPLAY_COUNTER_LEN];
1763 os_memcpy(_tmp, key->replay_counter,
1764 WPA_REPLAY_COUNTER_LEN);
1765 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
1766 if (os_memcmp(_tmp, peerkey->replay_counter,
1767 WPA_REPLAY_COUNTER_LEN) != 0) {
1768 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1769 "RSN: EAPOL-Key Replay "
1770 "Counter did not match (STK) - "
1771 "dropping packet");
1772 goto out;
1773 }
1774 }
1775 }
1776
1777 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
1778 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1779 "RSN: Ack bit in key_info from STK peer");
1780 goto out;
1781 }
1782 #endif /* CONFIG_PEERKEY */
1783
1784 if (!peerkey && sm->rx_replay_counter_set &&
1785 os_memcmp(key->replay_counter, sm->rx_replay_counter,
1786 WPA_REPLAY_COUNTER_LEN) <= 0) {
1787 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1788 "WPA: EAPOL-Key Replay Counter did not increase - "
1789 "dropping packet");
1790 goto out;
1791 }
1792
1793 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
1794 #ifdef CONFIG_PEERKEY
1795 && (peerkey == NULL || !peerkey->initiator)
1796 #endif /* CONFIG_PEERKEY */
1797 ) {
1798 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1799 "WPA: No Ack bit in key_info");
1800 goto out;
1801 }
1802
1803 if (key_info & WPA_KEY_INFO_REQUEST) {
1804 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1805 "WPA: EAPOL-Key with Request bit - dropped");
1806 goto out;
1807 }
1808
1809 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
1810 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
1811 goto out;
1812
1813 #ifdef CONFIG_PEERKEY
1814 if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
1815 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len))
1816 goto out;
1817 #endif /* CONFIG_PEERKEY */
1818
1819 extra_len = data_len - sizeof(*hdr) - sizeof(*key);
1820
1821 if (WPA_GET_BE16(key->key_data_length) > extra_len) {
1822 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1823 "frame - key_data overflow (%d > %lu)",
1824 WPA_GET_BE16(key->key_data_length),
1825 (unsigned long) extra_len);
1826 goto out;
1827 }
1828 extra_len = WPA_GET_BE16(key->key_data_length);
1829
1830 if (sm->proto == WPA_PROTO_RSN &&
1831 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1832 /*
1833 * Only decrypt the Key Data field if the frame's authenticity
1834 * was verified. When using AES-SIV (FILS), the MIC flag is not
1835 * set, so this check should only be performed if mic_len != 0
1836 * which is the case in this code branch.
1837 */
1838 if (!(key_info & WPA_KEY_INFO_MIC)) {
1839 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1840 "WPA: Ignore EAPOL-Key with encrypted but unauthenticated data");
1841 goto out;
1842 }
1843 if (wpa_supplicant_decrypt_key_data(sm, key, ver))
1844 goto out;
1845 extra_len = WPA_GET_BE16(key->key_data_length);
1846 }
1847
1848 if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1849 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
1850 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1851 "WPA: Ignored EAPOL-Key (Pairwise) with "
1852 "non-zero key index");
1853 goto out;
1854 }
1855 if (peerkey) {
1856 /* PeerKey 4-Way Handshake */
1857 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver);
1858 } else if (key_info & WPA_KEY_INFO_MIC) {
1859 /* 3/4 4-Way Handshake */
1860 wpa_supplicant_process_3_of_4(sm, key, ver);
1861 } else {
1862 /* 1/4 4-Way Handshake */
1863 wpa_supplicant_process_1_of_4(sm, src_addr, key,
1864 ver);
1865 }
1866 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1867 /* PeerKey SMK Handshake */
1868 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info,
1869 ver);
1870 } else {
1871 if (key_info & WPA_KEY_INFO_MIC) {
1872 /* 1/2 Group Key Handshake */
1873 wpa_supplicant_process_1_of_2(sm, src_addr, key,
1874 extra_len, ver);
1875 } else {
1876 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1877 "WPA: EAPOL-Key (Group) without Mic bit - "
1878 "dropped");
1879 }
1880 }
1881
1882 ret = 1;
1883
1884 out:
1885 os_free(tmp);
1886 return ret;
1887 }
1888
1889
1890 #ifdef CONFIG_CTRL_IFACE
wpa_key_mgmt_suite(struct wpa_sm * sm)1891 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
1892 {
1893 switch (sm->key_mgmt) {
1894 case WPA_KEY_MGMT_IEEE8021X:
1895 return (sm->proto == WPA_PROTO_RSN ?
1896 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
1897 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
1898 case WPA_KEY_MGMT_PSK:
1899 return (sm->proto == WPA_PROTO_RSN ?
1900 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
1901 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
1902 #ifdef CONFIG_IEEE80211R
1903 case WPA_KEY_MGMT_FT_IEEE8021X:
1904 return RSN_AUTH_KEY_MGMT_FT_802_1X;
1905 case WPA_KEY_MGMT_FT_PSK:
1906 return RSN_AUTH_KEY_MGMT_FT_PSK;
1907 #endif /* CONFIG_IEEE80211R */
1908 #ifdef CONFIG_IEEE80211W
1909 case WPA_KEY_MGMT_IEEE8021X_SHA256:
1910 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
1911 case WPA_KEY_MGMT_PSK_SHA256:
1912 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
1913 #endif /* CONFIG_IEEE80211W */
1914 case WPA_KEY_MGMT_CCKM:
1915 return (sm->proto == WPA_PROTO_RSN ?
1916 RSN_AUTH_KEY_MGMT_CCKM:
1917 WPA_AUTH_KEY_MGMT_CCKM);
1918 case WPA_KEY_MGMT_WPA_NONE:
1919 return WPA_AUTH_KEY_MGMT_NONE;
1920 default:
1921 return 0;
1922 }
1923 }
1924
1925
1926 #define RSN_SUITE "%02x-%02x-%02x-%d"
1927 #define RSN_SUITE_ARG(s) \
1928 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
1929
1930 /**
1931 * wpa_sm_get_mib - Dump text list of MIB entries
1932 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1933 * @buf: Buffer for the list
1934 * @buflen: Length of the buffer
1935 * Returns: Number of bytes written to buffer
1936 *
1937 * This function is used fetch dot11 MIB variables.
1938 */
wpa_sm_get_mib(struct wpa_sm * sm,char * buf,size_t buflen)1939 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
1940 {
1941 char pmkid_txt[PMKID_LEN * 2 + 1];
1942 int rsna, ret;
1943 size_t len;
1944
1945 if (sm->cur_pmksa) {
1946 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
1947 sm->cur_pmksa->pmkid, PMKID_LEN);
1948 } else
1949 pmkid_txt[0] = '\0';
1950
1951 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
1952 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
1953 sm->proto == WPA_PROTO_RSN)
1954 rsna = 1;
1955 else
1956 rsna = 0;
1957
1958 ret = os_snprintf(buf, buflen,
1959 "dot11RSNAOptionImplemented=TRUE\n"
1960 "dot11RSNAPreauthenticationImplemented=TRUE\n"
1961 "dot11RSNAEnabled=%s\n"
1962 "dot11RSNAPreauthenticationEnabled=%s\n"
1963 "dot11RSNAConfigVersion=%d\n"
1964 "dot11RSNAConfigPairwiseKeysSupported=5\n"
1965 "dot11RSNAConfigGroupCipherSize=%d\n"
1966 "dot11RSNAConfigPMKLifetime=%d\n"
1967 "dot11RSNAConfigPMKReauthThreshold=%d\n"
1968 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
1969 "dot11RSNAConfigSATimeout=%d\n",
1970 rsna ? "TRUE" : "FALSE",
1971 rsna ? "TRUE" : "FALSE",
1972 RSN_VERSION,
1973 wpa_cipher_key_len(sm->group_cipher) * 8,
1974 sm->dot11RSNAConfigPMKLifetime,
1975 sm->dot11RSNAConfigPMKReauthThreshold,
1976 sm->dot11RSNAConfigSATimeout);
1977 if (ret < 0 || (size_t) ret >= buflen)
1978 return 0;
1979 len = ret;
1980
1981 ret = os_snprintf(
1982 buf + len, buflen - len,
1983 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
1984 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
1985 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
1986 "dot11RSNAPMKIDUsed=%s\n"
1987 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
1988 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
1989 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
1990 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
1991 "dot11RSNA4WayHandshakeFailures=%u\n",
1992 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1993 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1994 sm->pairwise_cipher)),
1995 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1996 sm->group_cipher)),
1997 pmkid_txt,
1998 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1999 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
2000 sm->pairwise_cipher)),
2001 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
2002 sm->group_cipher)),
2003 sm->dot11RSNA4WayHandshakeFailures);
2004 if (ret >= 0 && (size_t) ret < buflen)
2005 len += ret;
2006
2007 return (int) len;
2008 }
2009 #endif /* CONFIG_CTRL_IFACE */
2010
2011
wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx,enum pmksa_free_reason reason)2012 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
2013 void *ctx, enum pmksa_free_reason reason)
2014 {
2015 struct wpa_sm *sm = ctx;
2016 int deauth = 0;
2017
2018 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: "
2019 MACSTR " reason=%d", MAC2STR(entry->aa), reason);
2020
2021 if (sm->cur_pmksa == entry) {
2022 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2023 "RSN: %s current PMKSA entry",
2024 reason == PMKSA_REPLACE ? "replaced" : "removed");
2025 pmksa_cache_clear_current(sm);
2026
2027 /*
2028 * If an entry is simply being replaced, there's no need to
2029 * deauthenticate because it will be immediately re-added.
2030 * This happens when EAP authentication is completed again
2031 * (reauth or failed PMKSA caching attempt).
2032 */
2033 if (reason != PMKSA_REPLACE)
2034 deauth = 1;
2035 }
2036
2037 if (reason == PMKSA_EXPIRE &&
2038 (sm->pmk_len == entry->pmk_len &&
2039 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
2040 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2041 "RSN: deauthenticating due to expired PMK");
2042 pmksa_cache_clear_current(sm);
2043 deauth = 1;
2044 }
2045
2046 if (deauth) {
2047 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2048 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
2049 }
2050 }
2051
2052
2053 /**
2054 * wpa_sm_init - Initialize WPA state machine
2055 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
2056 * Returns: Pointer to the allocated WPA state machine data
2057 *
2058 * This function is used to allocate a new WPA state machine and the returned
2059 * value is passed to all WPA state machine calls.
2060 */
wpa_sm_init(struct wpa_sm_ctx * ctx)2061 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
2062 {
2063 struct wpa_sm *sm;
2064
2065 sm = os_zalloc(sizeof(*sm));
2066 if (sm == NULL)
2067 return NULL;
2068 dl_list_init(&sm->pmksa_candidates);
2069 sm->renew_snonce = 1;
2070 sm->ctx = ctx;
2071
2072 sm->dot11RSNAConfigPMKLifetime = 43200;
2073 sm->dot11RSNAConfigPMKReauthThreshold = 70;
2074 sm->dot11RSNAConfigSATimeout = 60;
2075
2076 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
2077 if (sm->pmksa == NULL) {
2078 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
2079 "RSN: PMKSA cache initialization failed");
2080 os_free(sm);
2081 return NULL;
2082 }
2083
2084 return sm;
2085 }
2086
2087
2088 /**
2089 * wpa_sm_deinit - Deinitialize WPA state machine
2090 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2091 */
wpa_sm_deinit(struct wpa_sm * sm)2092 void wpa_sm_deinit(struct wpa_sm *sm)
2093 {
2094 if (sm == NULL)
2095 return;
2096 pmksa_cache_deinit(sm->pmksa);
2097 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
2098 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
2099 os_free(sm->assoc_wpa_ie);
2100 os_free(sm->ap_wpa_ie);
2101 os_free(sm->ap_rsn_ie);
2102 os_free(sm->ctx);
2103 peerkey_deinit(sm);
2104 #ifdef CONFIG_IEEE80211R
2105 os_free(sm->assoc_resp_ies);
2106 #endif /* CONFIG_IEEE80211R */
2107 os_free(sm);
2108 }
2109
2110
2111 /**
2112 * wpa_sm_notify_assoc - Notify WPA state machine about association
2113 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2114 * @bssid: The BSSID of the new association
2115 *
2116 * This function is called to let WPA state machine know that the connection
2117 * was established.
2118 */
wpa_sm_notify_assoc(struct wpa_sm * sm,const u8 * bssid)2119 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
2120 {
2121 int clear_keys = 1;
2122
2123 if (sm == NULL)
2124 return;
2125
2126 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2127 "WPA: Association event - clear replay counter");
2128 os_memcpy(sm->bssid, bssid, ETH_ALEN);
2129 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
2130 sm->rx_replay_counter_set = 0;
2131 sm->renew_snonce = 1;
2132 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
2133 rsn_preauth_deinit(sm);
2134
2135 #ifdef CONFIG_IEEE80211R
2136 if (wpa_ft_is_completed(sm)) {
2137 /*
2138 * Clear portValid to kick EAPOL state machine to re-enter
2139 * AUTHENTICATED state to get the EAPOL port Authorized.
2140 */
2141 eapol_sm_notify_portValid(sm->eapol, FALSE);
2142 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
2143
2144 /* Prepare for the next transition */
2145 wpa_ft_prepare_auth_request(sm, NULL);
2146
2147 clear_keys = 0;
2148 }
2149 #endif /* CONFIG_IEEE80211R */
2150
2151 if (clear_keys) {
2152 /*
2153 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
2154 * this is not part of a Fast BSS Transition.
2155 */
2156 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK");
2157 sm->ptk_set = 0;
2158 sm->tptk_set = 0;
2159 os_memset(&sm->gtk, 0, sizeof(sm->gtk));
2160 os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep));
2161 #ifdef CONFIG_IEEE80211W
2162 os_memset(&sm->igtk, 0, sizeof(sm->igtk));
2163 os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep));
2164 #endif /* CONFIG_IEEE80211W */
2165 }
2166
2167 #ifdef CONFIG_TDLS
2168 wpa_tdls_assoc(sm);
2169 #endif /* CONFIG_TDLS */
2170 }
2171
2172
2173 /**
2174 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
2175 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2176 *
2177 * This function is called to let WPA state machine know that the connection
2178 * was lost. This will abort any existing pre-authentication session.
2179 */
wpa_sm_notify_disassoc(struct wpa_sm * sm)2180 void wpa_sm_notify_disassoc(struct wpa_sm *sm)
2181 {
2182 rsn_preauth_deinit(sm);
2183 pmksa_cache_clear_current(sm);
2184 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
2185 sm->dot11RSNA4WayHandshakeFailures++;
2186 #ifdef CONFIG_TDLS
2187 wpa_tdls_disassoc(sm);
2188 #endif /* CONFIG_TDLS */
2189 #ifdef CONFIG_IEEE80211R
2190 sm->ft_reassoc_completed = 0;
2191 #endif /* CONFIG_IEEE80211R */
2192 }
2193
2194
2195 /**
2196 * wpa_sm_set_pmk - Set PMK
2197 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2198 * @pmk: The new PMK
2199 * @pmk_len: The length of the new PMK in bytes
2200 *
2201 * Configure the PMK for WPA state machine.
2202 */
wpa_sm_set_pmk(struct wpa_sm * sm,const u8 * pmk,size_t pmk_len)2203 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len)
2204 {
2205 if (sm == NULL)
2206 return;
2207
2208 sm->pmk_len = pmk_len;
2209 os_memcpy(sm->pmk, pmk, pmk_len);
2210
2211 #ifdef CONFIG_IEEE80211R
2212 /* Set XXKey to be PSK for FT key derivation */
2213 sm->xxkey_len = pmk_len;
2214 os_memcpy(sm->xxkey, pmk, pmk_len);
2215 #endif /* CONFIG_IEEE80211R */
2216 }
2217
2218
2219 /**
2220 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
2221 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2222 *
2223 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
2224 * will be cleared.
2225 */
wpa_sm_set_pmk_from_pmksa(struct wpa_sm * sm)2226 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
2227 {
2228 if (sm == NULL)
2229 return;
2230
2231 if (sm->cur_pmksa) {
2232 sm->pmk_len = sm->cur_pmksa->pmk_len;
2233 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
2234 } else {
2235 sm->pmk_len = PMK_LEN;
2236 os_memset(sm->pmk, 0, PMK_LEN);
2237 }
2238 }
2239
2240
2241 /**
2242 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
2243 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2244 * @fast_reauth: Whether fast reauthentication (EAP) is allowed
2245 */
wpa_sm_set_fast_reauth(struct wpa_sm * sm,int fast_reauth)2246 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
2247 {
2248 if (sm)
2249 sm->fast_reauth = fast_reauth;
2250 }
2251
2252
2253 /**
2254 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
2255 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2256 * @scard_ctx: Context pointer for smartcard related callback functions
2257 */
wpa_sm_set_scard_ctx(struct wpa_sm * sm,void * scard_ctx)2258 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
2259 {
2260 if (sm == NULL)
2261 return;
2262 sm->scard_ctx = scard_ctx;
2263 if (sm->preauth_eapol)
2264 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
2265 }
2266
2267
2268 /**
2269 * wpa_sm_set_config - Notification of current configration change
2270 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2271 * @config: Pointer to current network configuration
2272 *
2273 * Notify WPA state machine that configuration has changed. config will be
2274 * stored as a backpointer to network configuration. This can be %NULL to clear
2275 * the stored pointed.
2276 */
wpa_sm_set_config(struct wpa_sm * sm,struct rsn_supp_config * config)2277 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
2278 {
2279 if (!sm)
2280 return;
2281
2282 if (config) {
2283 sm->network_ctx = config->network_ctx;
2284 sm->peerkey_enabled = config->peerkey_enabled;
2285 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2286 sm->proactive_key_caching = config->proactive_key_caching;
2287 sm->eap_workaround = config->eap_workaround;
2288 sm->eap_conf_ctx = config->eap_conf_ctx;
2289 if (config->ssid) {
2290 os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2291 sm->ssid_len = config->ssid_len;
2292 } else
2293 sm->ssid_len = 0;
2294 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
2295 } else {
2296 sm->network_ctx = NULL;
2297 sm->peerkey_enabled = 0;
2298 sm->allowed_pairwise_cipher = 0;
2299 sm->proactive_key_caching = 0;
2300 sm->eap_workaround = 0;
2301 sm->eap_conf_ctx = NULL;
2302 sm->ssid_len = 0;
2303 sm->wpa_ptk_rekey = 0;
2304 }
2305 }
2306
2307
2308 /**
2309 * wpa_sm_set_own_addr - Set own MAC address
2310 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2311 * @addr: Own MAC address
2312 */
wpa_sm_set_own_addr(struct wpa_sm * sm,const u8 * addr)2313 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2314 {
2315 if (sm)
2316 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2317 }
2318
2319
2320 /**
2321 * wpa_sm_set_ifname - Set network interface name
2322 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2323 * @ifname: Interface name
2324 * @bridge_ifname: Optional bridge interface name (for pre-auth)
2325 */
wpa_sm_set_ifname(struct wpa_sm * sm,const char * ifname,const char * bridge_ifname)2326 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2327 const char *bridge_ifname)
2328 {
2329 if (sm) {
2330 sm->ifname = ifname;
2331 sm->bridge_ifname = bridge_ifname;
2332 }
2333 }
2334
2335
2336 /**
2337 * wpa_sm_set_eapol - Set EAPOL state machine pointer
2338 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2339 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2340 */
wpa_sm_set_eapol(struct wpa_sm * sm,struct eapol_sm * eapol)2341 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2342 {
2343 if (sm)
2344 sm->eapol = eapol;
2345 }
2346
2347
2348 /**
2349 * wpa_sm_set_param - Set WPA state machine parameters
2350 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2351 * @param: Parameter field
2352 * @value: Parameter value
2353 * Returns: 0 on success, -1 on failure
2354 */
wpa_sm_set_param(struct wpa_sm * sm,enum wpa_sm_conf_params param,unsigned int value)2355 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2356 unsigned int value)
2357 {
2358 int ret = 0;
2359
2360 if (sm == NULL)
2361 return -1;
2362
2363 switch (param) {
2364 case RSNA_PMK_LIFETIME:
2365 if (value > 0)
2366 sm->dot11RSNAConfigPMKLifetime = value;
2367 else
2368 ret = -1;
2369 break;
2370 case RSNA_PMK_REAUTH_THRESHOLD:
2371 if (value > 0 && value <= 100)
2372 sm->dot11RSNAConfigPMKReauthThreshold = value;
2373 else
2374 ret = -1;
2375 break;
2376 case RSNA_SA_TIMEOUT:
2377 if (value > 0)
2378 sm->dot11RSNAConfigSATimeout = value;
2379 else
2380 ret = -1;
2381 break;
2382 case WPA_PARAM_PROTO:
2383 sm->proto = value;
2384 break;
2385 case WPA_PARAM_PAIRWISE:
2386 sm->pairwise_cipher = value;
2387 break;
2388 case WPA_PARAM_GROUP:
2389 sm->group_cipher = value;
2390 break;
2391 case WPA_PARAM_KEY_MGMT:
2392 sm->key_mgmt = value;
2393 break;
2394 #ifdef CONFIG_IEEE80211W
2395 case WPA_PARAM_MGMT_GROUP:
2396 sm->mgmt_group_cipher = value;
2397 break;
2398 #endif /* CONFIG_IEEE80211W */
2399 case WPA_PARAM_RSN_ENABLED:
2400 sm->rsn_enabled = value;
2401 break;
2402 case WPA_PARAM_MFP:
2403 sm->mfp = value;
2404 break;
2405 default:
2406 break;
2407 }
2408
2409 return ret;
2410 }
2411
2412
2413 /**
2414 * wpa_sm_get_param - Get WPA state machine parameters
2415 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2416 * @param: Parameter field
2417 * Returns: Parameter value
2418 */
wpa_sm_get_param(struct wpa_sm * sm,enum wpa_sm_conf_params param)2419 unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param)
2420 {
2421 if (sm == NULL)
2422 return 0;
2423
2424 switch (param) {
2425 case RSNA_PMK_LIFETIME:
2426 return sm->dot11RSNAConfigPMKLifetime;
2427 case RSNA_PMK_REAUTH_THRESHOLD:
2428 return sm->dot11RSNAConfigPMKReauthThreshold;
2429 case RSNA_SA_TIMEOUT:
2430 return sm->dot11RSNAConfigSATimeout;
2431 case WPA_PARAM_PROTO:
2432 return sm->proto;
2433 case WPA_PARAM_PAIRWISE:
2434 return sm->pairwise_cipher;
2435 case WPA_PARAM_GROUP:
2436 return sm->group_cipher;
2437 case WPA_PARAM_KEY_MGMT:
2438 return sm->key_mgmt;
2439 #ifdef CONFIG_IEEE80211W
2440 case WPA_PARAM_MGMT_GROUP:
2441 return sm->mgmt_group_cipher;
2442 #endif /* CONFIG_IEEE80211W */
2443 case WPA_PARAM_RSN_ENABLED:
2444 return sm->rsn_enabled;
2445 default:
2446 return 0;
2447 }
2448 }
2449
2450
2451 /**
2452 * wpa_sm_get_status - Get WPA state machine
2453 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2454 * @buf: Buffer for status information
2455 * @buflen: Maximum buffer length
2456 * @verbose: Whether to include verbose status information
2457 * Returns: Number of bytes written to buf.
2458 *
2459 * Query WPA state machine for status information. This function fills in
2460 * a text area with current status information. If the buffer (buf) is not
2461 * large enough, status information will be truncated to fit the buffer.
2462 */
wpa_sm_get_status(struct wpa_sm * sm,char * buf,size_t buflen,int verbose)2463 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2464 int verbose)
2465 {
2466 char *pos = buf, *end = buf + buflen;
2467 int ret;
2468
2469 ret = os_snprintf(pos, end - pos,
2470 "pairwise_cipher=%s\n"
2471 "group_cipher=%s\n"
2472 "key_mgmt=%s\n",
2473 wpa_cipher_txt(sm->pairwise_cipher),
2474 wpa_cipher_txt(sm->group_cipher),
2475 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2476 if (ret < 0 || ret >= end - pos)
2477 return pos - buf;
2478 pos += ret;
2479
2480 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) {
2481 struct wpa_ie_data rsn;
2482 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn)
2483 >= 0 &&
2484 rsn.capabilities & (WPA_CAPABILITY_MFPR |
2485 WPA_CAPABILITY_MFPC)) {
2486 ret = os_snprintf(pos, end - pos, "pmf=%d\n",
2487 (rsn.capabilities &
2488 WPA_CAPABILITY_MFPR) ? 2 : 1);
2489 if (ret < 0 || ret >= end - pos)
2490 return pos - buf;
2491 pos += ret;
2492 }
2493 }
2494
2495 return pos - buf;
2496 }
2497
2498
2499 /**
2500 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2501 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2502 * @wpa_ie: Pointer to buffer for WPA/RSN IE
2503 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2504 * Returns: 0 on success, -1 on failure
2505 */
wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm * sm,u8 * wpa_ie,size_t * wpa_ie_len)2506 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2507 size_t *wpa_ie_len)
2508 {
2509 int res;
2510
2511 if (sm == NULL)
2512 return -1;
2513
2514 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2515 if (res < 0)
2516 return -1;
2517 *wpa_ie_len = res;
2518
2519 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2520 wpa_ie, *wpa_ie_len);
2521
2522 if (sm->assoc_wpa_ie == NULL) {
2523 /*
2524 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2525 * the correct version of the IE even if PMKSA caching is
2526 * aborted (which would remove PMKID from IE generation).
2527 */
2528 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2529 if (sm->assoc_wpa_ie == NULL)
2530 return -1;
2531
2532 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2533 sm->assoc_wpa_ie_len = *wpa_ie_len;
2534 }
2535
2536 return 0;
2537 }
2538
2539
2540 /**
2541 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2542 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2543 * @ie: Pointer to IE data (starting from id)
2544 * @len: IE length
2545 * Returns: 0 on success, -1 on failure
2546 *
2547 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2548 * Request frame. The IE will be used to override the default value generated
2549 * with wpa_sm_set_assoc_wpa_ie_default().
2550 */
wpa_sm_set_assoc_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2551 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2552 {
2553 if (sm == NULL)
2554 return -1;
2555
2556 os_free(sm->assoc_wpa_ie);
2557 if (ie == NULL || len == 0) {
2558 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2559 "WPA: clearing own WPA/RSN IE");
2560 sm->assoc_wpa_ie = NULL;
2561 sm->assoc_wpa_ie_len = 0;
2562 } else {
2563 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2564 sm->assoc_wpa_ie = os_malloc(len);
2565 if (sm->assoc_wpa_ie == NULL)
2566 return -1;
2567
2568 os_memcpy(sm->assoc_wpa_ie, ie, len);
2569 sm->assoc_wpa_ie_len = len;
2570 }
2571
2572 return 0;
2573 }
2574
2575
2576 /**
2577 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2578 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2579 * @ie: Pointer to IE data (starting from id)
2580 * @len: IE length
2581 * Returns: 0 on success, -1 on failure
2582 *
2583 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2584 * frame.
2585 */
wpa_sm_set_ap_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2586 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2587 {
2588 if (sm == NULL)
2589 return -1;
2590
2591 os_free(sm->ap_wpa_ie);
2592 if (ie == NULL || len == 0) {
2593 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2594 "WPA: clearing AP WPA IE");
2595 sm->ap_wpa_ie = NULL;
2596 sm->ap_wpa_ie_len = 0;
2597 } else {
2598 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2599 sm->ap_wpa_ie = os_malloc(len);
2600 if (sm->ap_wpa_ie == NULL)
2601 return -1;
2602
2603 os_memcpy(sm->ap_wpa_ie, ie, len);
2604 sm->ap_wpa_ie_len = len;
2605 }
2606
2607 return 0;
2608 }
2609
2610
2611 /**
2612 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
2613 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2614 * @ie: Pointer to IE data (starting from id)
2615 * @len: IE length
2616 * Returns: 0 on success, -1 on failure
2617 *
2618 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response
2619 * frame.
2620 */
wpa_sm_set_ap_rsn_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2621 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2622 {
2623 if (sm == NULL)
2624 return -1;
2625
2626 os_free(sm->ap_rsn_ie);
2627 if (ie == NULL || len == 0) {
2628 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2629 "WPA: clearing AP RSN IE");
2630 sm->ap_rsn_ie = NULL;
2631 sm->ap_rsn_ie_len = 0;
2632 } else {
2633 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2634 sm->ap_rsn_ie = os_malloc(len);
2635 if (sm->ap_rsn_ie == NULL)
2636 return -1;
2637
2638 os_memcpy(sm->ap_rsn_ie, ie, len);
2639 sm->ap_rsn_ie_len = len;
2640 }
2641
2642 return 0;
2643 }
2644
2645
2646 /**
2647 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
2648 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2649 * @data: Pointer to data area for parsing results
2650 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
2651 *
2652 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
2653 * parsed data into data.
2654 */
wpa_sm_parse_own_wpa_ie(struct wpa_sm * sm,struct wpa_ie_data * data)2655 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
2656 {
2657 if (sm == NULL)
2658 return -1;
2659
2660 if (sm->assoc_wpa_ie == NULL) {
2661 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2662 "WPA: No WPA/RSN IE available from association info");
2663 return -1;
2664 }
2665 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
2666 return -2;
2667 return 0;
2668 }
2669
2670
wpa_sm_pmksa_cache_list(struct wpa_sm * sm,char * buf,size_t len)2671 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len)
2672 {
2673 #ifndef CONFIG_NO_WPA2
2674 return pmksa_cache_list(sm->pmksa, buf, len);
2675 #else /* CONFIG_NO_WPA2 */
2676 return -1;
2677 #endif /* CONFIG_NO_WPA2 */
2678 }
2679
2680
wpa_sm_drop_sa(struct wpa_sm * sm)2681 void wpa_sm_drop_sa(struct wpa_sm *sm)
2682 {
2683 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK");
2684 sm->ptk_set = 0;
2685 sm->tptk_set = 0;
2686 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2687 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
2688 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
2689 os_memset(&sm->gtk, 0, sizeof(sm->gtk));
2690 os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep));
2691 #ifdef CONFIG_IEEE80211W
2692 os_memset(&sm->igtk, 0, sizeof(sm->igtk));
2693 os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep));
2694 #endif /* CONFIG_IEEE80211W */
2695 }
2696
2697
wpa_sm_has_ptk(struct wpa_sm * sm)2698 int wpa_sm_has_ptk(struct wpa_sm *sm)
2699 {
2700 if (sm == NULL)
2701 return 0;
2702 return sm->ptk_set;
2703 }
2704
2705
wpa_sm_update_replay_ctr(struct wpa_sm * sm,const u8 * replay_ctr)2706 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr)
2707 {
2708 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN);
2709 }
2710
2711
wpa_sm_pmksa_cache_flush(struct wpa_sm * sm,void * network_ctx)2712 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx)
2713 {
2714 #ifndef CONFIG_NO_WPA2
2715 pmksa_cache_flush(sm->pmksa, network_ctx);
2716 #endif /* CONFIG_NO_WPA2 */
2717 }
2718
2719
2720 #ifdef CONFIG_WNM
wpa_wnmsleep_install_key(struct wpa_sm * sm,u8 subelem_id,u8 * buf)2721 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf)
2722 {
2723 struct wpa_gtk_data gd;
2724 #ifdef CONFIG_IEEE80211W
2725 struct wpa_igtk_kde igd;
2726 u16 keyidx;
2727 #endif /* CONFIG_IEEE80211W */
2728 u16 keyinfo;
2729 u8 keylen; /* plaintext key len */
2730 u8 *key_rsc;
2731
2732 os_memset(&gd, 0, sizeof(gd));
2733 #ifdef CONFIG_IEEE80211W
2734 os_memset(&igd, 0, sizeof(igd));
2735 #endif /* CONFIG_IEEE80211W */
2736
2737 keylen = wpa_cipher_key_len(sm->group_cipher);
2738 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
2739 gd.alg = wpa_cipher_to_alg(sm->group_cipher);
2740 if (gd.alg == WPA_ALG_NONE) {
2741 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite");
2742 return -1;
2743 }
2744
2745 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) {
2746 key_rsc = buf + 5;
2747 keyinfo = WPA_GET_LE16(buf + 2);
2748 gd.gtk_len = keylen;
2749 if (gd.gtk_len != buf[4]) {
2750 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d",
2751 gd.gtk_len, buf[4]);
2752 return -1;
2753 }
2754 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */
2755 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(
2756 sm, !!(keyinfo & WPA_KEY_INFO_TXRX));
2757
2758 os_memcpy(gd.gtk, buf + 13, gd.gtk_len);
2759
2760 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)",
2761 gd.gtk, gd.gtk_len);
2762 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 1)) {
2763 wpa_printf(MSG_DEBUG, "Failed to install the GTK in "
2764 "WNM mode");
2765 return -1;
2766 }
2767 #ifdef CONFIG_IEEE80211W
2768 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) {
2769 const struct wpa_igtk_kde *igtk;
2770
2771 igtk = (const struct wpa_igtk_kde *) (buf + 2);
2772 if (wpa_supplicant_install_igtk(sm, igtk, 1) < 0)
2773 return -1;
2774 #endif /* CONFIG_IEEE80211W */
2775 } else {
2776 wpa_printf(MSG_DEBUG, "Unknown element id");
2777 return -1;
2778 }
2779
2780 return 0;
2781 }
2782 #endif /* CONFIG_WNM */
2783