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 (sm->key_mgmt == WPA_KEY_MGMT_OSEN)
93 ver = WPA_KEY_INFO_TYPE_AKM_DEFINED;
94 else if (wpa_key_mgmt_ft(sm->key_mgmt) ||
95 wpa_key_mgmt_sha256(sm->key_mgmt))
96 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
97 else if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
98 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
99 else
100 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
101
102 if (wpa_sm_get_bssid(sm, bssid) < 0) {
103 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
104 "Failed to read BSSID for EAPOL-Key request");
105 return;
106 }
107
108 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
109 sizeof(*reply), &rlen, (void *) &reply);
110 if (rbuf == NULL)
111 return;
112
113 reply->type = (sm->proto == WPA_PROTO_RSN ||
114 sm->proto == WPA_PROTO_OSEN) ?
115 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
116 key_info = WPA_KEY_INFO_REQUEST | ver;
117 if (sm->ptk_set)
118 key_info |= WPA_KEY_INFO_MIC;
119 if (error)
120 key_info |= WPA_KEY_INFO_ERROR;
121 if (pairwise)
122 key_info |= WPA_KEY_INFO_KEY_TYPE;
123 WPA_PUT_BE16(reply->key_info, key_info);
124 WPA_PUT_BE16(reply->key_length, 0);
125 os_memcpy(reply->replay_counter, sm->request_counter,
126 WPA_REPLAY_COUNTER_LEN);
127 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
128
129 WPA_PUT_BE16(reply->key_data_length, 0);
130
131 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
132 "WPA: Sending EAPOL-Key Request (error=%d "
133 "pairwise=%d ptk_set=%d len=%lu)",
134 error, pairwise, sm->ptk_set, (unsigned long) rlen);
135 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
136 rbuf, rlen, key_info & WPA_KEY_INFO_MIC ?
137 reply->key_mic : NULL);
138 }
139
140
wpa_supplicant_get_pmk(struct wpa_sm * sm,const unsigned char * src_addr,const u8 * pmkid)141 static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
142 const unsigned char *src_addr,
143 const u8 *pmkid)
144 {
145 int abort_cached = 0;
146
147 if (pmkid && !sm->cur_pmksa) {
148 /* When using drivers that generate RSN IE, wpa_supplicant may
149 * not have enough time to get the association information
150 * event before receiving this 1/4 message, so try to find a
151 * matching PMKSA cache entry here. */
152 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid,
153 NULL);
154 if (sm->cur_pmksa) {
155 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
156 "RSN: found matching PMKID from PMKSA cache");
157 } else {
158 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
159 "RSN: no matching PMKID found");
160 abort_cached = 1;
161 }
162 }
163
164 if (pmkid && sm->cur_pmksa &&
165 os_memcmp_const(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
166 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
167 wpa_sm_set_pmk_from_pmksa(sm);
168 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
169 sm->pmk, sm->pmk_len);
170 eapol_sm_notify_cached(sm->eapol);
171 #ifdef CONFIG_IEEE80211R
172 sm->xxkey_len = 0;
173 #endif /* CONFIG_IEEE80211R */
174 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
175 int res, pmk_len;
176 pmk_len = PMK_LEN;
177 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN);
178 if (res) {
179 /*
180 * EAP-LEAP is an exception from other EAP methods: it
181 * uses only 16-byte PMK.
182 */
183 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
184 pmk_len = 16;
185 } else {
186 #ifdef CONFIG_IEEE80211R
187 u8 buf[2 * PMK_LEN];
188 if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
189 {
190 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
191 sm->xxkey_len = PMK_LEN;
192 os_memset(buf, 0, sizeof(buf));
193 }
194 #endif /* CONFIG_IEEE80211R */
195 }
196 if (res == 0) {
197 struct rsn_pmksa_cache_entry *sa = NULL;
198 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
199 "machines", sm->pmk, pmk_len);
200 sm->pmk_len = pmk_len;
201 if (sm->proto == WPA_PROTO_RSN &&
202 !wpa_key_mgmt_ft(sm->key_mgmt)) {
203 sa = pmksa_cache_add(sm->pmksa,
204 sm->pmk, pmk_len,
205 src_addr, sm->own_addr,
206 sm->network_ctx,
207 sm->key_mgmt);
208 }
209 if (!sm->cur_pmksa && pmkid &&
210 pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL))
211 {
212 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
213 "RSN: the new PMK matches with the "
214 "PMKID");
215 abort_cached = 0;
216 }
217
218 if (!sm->cur_pmksa)
219 sm->cur_pmksa = sa;
220 } else {
221 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
222 "WPA: Failed to get master session key from "
223 "EAPOL state machines - key handshake "
224 "aborted");
225 if (sm->cur_pmksa) {
226 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
227 "RSN: Cancelled PMKSA caching "
228 "attempt");
229 sm->cur_pmksa = NULL;
230 abort_cached = 1;
231 } else if (!abort_cached) {
232 return -1;
233 }
234 }
235 }
236
237 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) &&
238 !wpa_key_mgmt_ft(sm->key_mgmt) && sm->key_mgmt != WPA_KEY_MGMT_OSEN)
239 {
240 /* Send EAPOL-Start to trigger full EAP authentication. */
241 u8 *buf;
242 size_t buflen;
243
244 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
245 "RSN: no PMKSA entry found - trigger "
246 "full EAP authentication");
247 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
248 NULL, 0, &buflen, NULL);
249 if (buf) {
250 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
251 buf, buflen);
252 os_free(buf);
253 return -2;
254 }
255
256 return -1;
257 }
258
259 return 0;
260 }
261
262
263 /**
264 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
265 * @sm: Pointer to WPA state machine data from wpa_sm_init()
266 * @dst: Destination address for the frame
267 * @key: Pointer to the EAPOL-Key frame header
268 * @ver: Version bits from EAPOL-Key Key Info
269 * @nonce: Nonce value for the EAPOL-Key frame
270 * @wpa_ie: WPA/RSN IE
271 * @wpa_ie_len: Length of the WPA/RSN IE
272 * @ptk: PTK to use for keyed hash and encryption
273 * Returns: 0 on success, -1 on failure
274 */
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)275 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
276 const struct wpa_eapol_key *key,
277 int ver, const u8 *nonce,
278 const u8 *wpa_ie, size_t wpa_ie_len,
279 struct wpa_ptk *ptk)
280 {
281 size_t rlen;
282 struct wpa_eapol_key *reply;
283 u8 *rbuf;
284 u8 *rsn_ie_buf = NULL;
285
286 if (wpa_ie == NULL) {
287 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No wpa_ie set - "
288 "cannot generate msg 2/4");
289 return -1;
290 }
291
292 #ifdef CONFIG_IEEE80211R
293 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
294 int res;
295
296 /*
297 * Add PMKR1Name into RSN IE (PMKID-List) and add MDIE and
298 * FTIE from (Re)Association Response.
299 */
300 rsn_ie_buf = os_malloc(wpa_ie_len + 2 + 2 + PMKID_LEN +
301 sm->assoc_resp_ies_len);
302 if (rsn_ie_buf == NULL)
303 return -1;
304 os_memcpy(rsn_ie_buf, wpa_ie, wpa_ie_len);
305 res = wpa_insert_pmkid(rsn_ie_buf, wpa_ie_len,
306 sm->pmk_r1_name);
307 if (res < 0) {
308 os_free(rsn_ie_buf);
309 return -1;
310 }
311 wpa_ie_len += res;
312
313 if (sm->assoc_resp_ies) {
314 os_memcpy(rsn_ie_buf + wpa_ie_len, sm->assoc_resp_ies,
315 sm->assoc_resp_ies_len);
316 wpa_ie_len += sm->assoc_resp_ies_len;
317 }
318
319 wpa_ie = rsn_ie_buf;
320 }
321 #endif /* CONFIG_IEEE80211R */
322
323 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
324
325 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
326 NULL, sizeof(*reply) + wpa_ie_len,
327 &rlen, (void *) &reply);
328 if (rbuf == NULL) {
329 os_free(rsn_ie_buf);
330 return -1;
331 }
332
333 reply->type = (sm->proto == WPA_PROTO_RSN ||
334 sm->proto == WPA_PROTO_OSEN) ?
335 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
336 WPA_PUT_BE16(reply->key_info,
337 ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC);
338 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
339 WPA_PUT_BE16(reply->key_length, 0);
340 else
341 os_memcpy(reply->key_length, key->key_length, 2);
342 os_memcpy(reply->replay_counter, key->replay_counter,
343 WPA_REPLAY_COUNTER_LEN);
344 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter,
345 WPA_REPLAY_COUNTER_LEN);
346
347 WPA_PUT_BE16(reply->key_data_length, wpa_ie_len);
348 os_memcpy(reply + 1, wpa_ie, wpa_ie_len);
349 os_free(rsn_ie_buf);
350
351 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
352
353 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
354 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
355 rbuf, rlen, reply->key_mic);
356
357 return 0;
358 }
359
360
wpa_derive_ptk(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)361 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
362 const struct wpa_eapol_key *key,
363 struct wpa_ptk *ptk)
364 {
365 size_t ptk_len = wpa_cipher_key_len(sm->pairwise_cipher) + 32;
366 #ifdef CONFIG_IEEE80211R
367 if (wpa_key_mgmt_ft(sm->key_mgmt))
368 return wpa_derive_ptk_ft(sm, src_addr, key, ptk, ptk_len);
369 #endif /* CONFIG_IEEE80211R */
370
371 wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
372 sm->own_addr, sm->bssid, sm->snonce, key->key_nonce,
373 (u8 *) ptk, ptk_len,
374 wpa_key_mgmt_sha256(sm->key_mgmt));
375 return 0;
376 }
377
378
wpa_supplicant_process_1_of_4(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,u16 ver,const u8 * key_data,size_t key_data_len)379 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
380 const unsigned char *src_addr,
381 const struct wpa_eapol_key *key,
382 u16 ver, const u8 *key_data,
383 size_t key_data_len)
384 {
385 struct wpa_eapol_ie_parse ie;
386 struct wpa_ptk *ptk;
387 int res;
388 u8 *kde, *kde_buf = NULL;
389 size_t kde_len;
390
391 if (wpa_sm_get_network_ctx(sm) == NULL) {
392 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No SSID info "
393 "found (msg 1 of 4)");
394 return;
395 }
396
397 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
398 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of 4-Way "
399 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
400
401 os_memset(&ie, 0, sizeof(ie));
402
403 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
404 /* RSN: msg 1/4 should contain PMKID for the selected PMK */
405 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data",
406 key_data, key_data_len);
407 if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
408 goto failed;
409 if (ie.pmkid) {
410 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
411 "Authenticator", ie.pmkid, PMKID_LEN);
412 }
413 }
414
415 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid);
416 if (res == -2) {
417 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to "
418 "msg 1/4 - requesting full EAP authentication");
419 return;
420 }
421 if (res)
422 goto failed;
423
424 if (sm->renew_snonce) {
425 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
426 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
427 "WPA: Failed to get random data for SNonce");
428 goto failed;
429 }
430 sm->renew_snonce = 0;
431 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
432 sm->snonce, WPA_NONCE_LEN);
433 }
434
435 /* Calculate PTK which will be stored as a temporary PTK until it has
436 * been verified when processing message 3/4. */
437 ptk = &sm->tptk;
438 wpa_derive_ptk(sm, src_addr, key, ptk);
439 if (sm->pairwise_cipher == WPA_CIPHER_TKIP) {
440 u8 buf[8];
441 /* Supplicant: swap tx/rx Mic keys */
442 os_memcpy(buf, ptk->u.auth.tx_mic_key, 8);
443 os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8);
444 os_memcpy(ptk->u.auth.rx_mic_key, buf, 8);
445 os_memset(buf, 0, sizeof(buf));
446 }
447 sm->tptk_set = 1;
448
449 kde = sm->assoc_wpa_ie;
450 kde_len = sm->assoc_wpa_ie_len;
451
452 #ifdef CONFIG_P2P
453 if (sm->p2p) {
454 kde_buf = os_malloc(kde_len + 2 + RSN_SELECTOR_LEN + 1);
455 if (kde_buf) {
456 u8 *pos;
457 wpa_printf(MSG_DEBUG, "P2P: Add IP Address Request KDE "
458 "into EAPOL-Key 2/4");
459 os_memcpy(kde_buf, kde, kde_len);
460 kde = kde_buf;
461 pos = kde + kde_len;
462 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
463 *pos++ = RSN_SELECTOR_LEN + 1;
464 RSN_SELECTOR_PUT(pos, WFA_KEY_DATA_IP_ADDR_REQ);
465 pos += RSN_SELECTOR_LEN;
466 *pos++ = 0x01;
467 kde_len = pos - kde;
468 }
469 }
470 #endif /* CONFIG_P2P */
471
472 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
473 kde, kde_len, ptk))
474 goto failed;
475
476 os_free(kde_buf);
477 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
478 return;
479
480 failed:
481 os_free(kde_buf);
482 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
483 }
484
485
wpa_sm_start_preauth(void * eloop_ctx,void * timeout_ctx)486 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
487 {
488 struct wpa_sm *sm = eloop_ctx;
489 rsn_preauth_candidate_process(sm);
490 }
491
492
wpa_supplicant_key_neg_complete(struct wpa_sm * sm,const u8 * addr,int secure)493 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
494 const u8 *addr, int secure)
495 {
496 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
497 "WPA: Key negotiation completed with "
498 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
499 wpa_cipher_txt(sm->pairwise_cipher),
500 wpa_cipher_txt(sm->group_cipher));
501 wpa_sm_cancel_auth_timeout(sm);
502 wpa_sm_set_state(sm, WPA_COMPLETED);
503
504 if (secure) {
505 wpa_sm_mlme_setprotection(
506 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
507 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
508 eapol_sm_notify_portValid(sm->eapol, TRUE);
509 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt))
510 eapol_sm_notify_eap_success(sm->eapol, TRUE);
511 /*
512 * Start preauthentication after a short wait to avoid a
513 * possible race condition between the data receive and key
514 * configuration after the 4-Way Handshake. This increases the
515 * likelihood of the first preauth EAPOL-Start frame getting to
516 * the target AP.
517 */
518 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
519 }
520
521 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
522 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
523 "RSN: Authenticator accepted "
524 "opportunistic PMKSA entry - marking it valid");
525 sm->cur_pmksa->opportunistic = 0;
526 }
527
528 #ifdef CONFIG_IEEE80211R
529 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
530 /* Prepare for the next transition */
531 wpa_ft_prepare_auth_request(sm, NULL);
532 }
533 #endif /* CONFIG_IEEE80211R */
534 }
535
536
wpa_sm_rekey_ptk(void * eloop_ctx,void * timeout_ctx)537 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
538 {
539 struct wpa_sm *sm = eloop_ctx;
540 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Request PTK rekeying");
541 wpa_sm_key_request(sm, 0, 1);
542 }
543
544
wpa_supplicant_install_ptk(struct wpa_sm * sm,const struct wpa_eapol_key * key)545 static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
546 const struct wpa_eapol_key *key)
547 {
548 int keylen, rsclen;
549 enum wpa_alg alg;
550 const u8 *key_rsc;
551 u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
552
553 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
554 "WPA: Installing PTK to the driver");
555
556 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
557 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher "
558 "Suite: NONE - do not use pairwise keys");
559 return 0;
560 }
561
562 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
563 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
564 "WPA: Unsupported pairwise cipher %d",
565 sm->pairwise_cipher);
566 return -1;
567 }
568
569 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
570 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
571 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher);
572
573 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
574 key_rsc = null_rsc;
575 } else {
576 key_rsc = key->key_rsc;
577 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
578 }
579
580 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
581 (u8 *) sm->ptk.tk1, keylen) < 0) {
582 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
583 "WPA: Failed to set PTK to the "
584 "driver (alg=%d keylen=%d bssid=" MACSTR ")",
585 alg, keylen, MAC2STR(sm->bssid));
586 return -1;
587 }
588
589 if (sm->wpa_ptk_rekey) {
590 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
591 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
592 sm, NULL);
593 }
594
595 return 0;
596 }
597
598
wpa_supplicant_check_group_cipher(struct wpa_sm * sm,int group_cipher,int keylen,int maxkeylen,int * key_rsc_len,enum wpa_alg * alg)599 static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm,
600 int group_cipher,
601 int keylen, int maxkeylen,
602 int *key_rsc_len,
603 enum wpa_alg *alg)
604 {
605 int klen;
606
607 *alg = wpa_cipher_to_alg(group_cipher);
608 if (*alg == WPA_ALG_NONE) {
609 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
610 "WPA: Unsupported Group Cipher %d",
611 group_cipher);
612 return -1;
613 }
614 *key_rsc_len = wpa_cipher_rsc_len(group_cipher);
615
616 klen = wpa_cipher_key_len(group_cipher);
617 if (keylen != klen || maxkeylen < klen) {
618 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
619 "WPA: Unsupported %s Group Cipher key length %d (%d)",
620 wpa_cipher_txt(group_cipher), keylen, maxkeylen);
621 return -1;
622 }
623 return 0;
624 }
625
626
627 struct wpa_gtk_data {
628 enum wpa_alg alg;
629 int tx, key_rsc_len, keyidx;
630 u8 gtk[32];
631 int gtk_len;
632 };
633
634
wpa_supplicant_install_gtk(struct wpa_sm * sm,const struct wpa_gtk_data * gd,const u8 * key_rsc)635 static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
636 const struct wpa_gtk_data *gd,
637 const u8 *key_rsc)
638 {
639 const u8 *_gtk = gd->gtk;
640 u8 gtk_buf[32];
641
642 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
643 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
644 "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)",
645 gd->keyidx, gd->tx, gd->gtk_len);
646 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
647 if (sm->group_cipher == WPA_CIPHER_TKIP) {
648 /* Swap Tx/Rx keys for Michael MIC */
649 os_memcpy(gtk_buf, gd->gtk, 16);
650 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
651 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
652 _gtk = gtk_buf;
653 }
654 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
655 if (wpa_sm_set_key(sm, gd->alg, NULL,
656 gd->keyidx, 1, key_rsc, gd->key_rsc_len,
657 _gtk, gd->gtk_len) < 0) {
658 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
659 "WPA: Failed to set GTK to the driver "
660 "(Group only)");
661 os_memset(gtk_buf, 0, sizeof(gtk_buf));
662 return -1;
663 }
664 } else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr,
665 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
666 _gtk, gd->gtk_len) < 0) {
667 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
668 "WPA: Failed to set GTK to "
669 "the driver (alg=%d keylen=%d keyidx=%d)",
670 gd->alg, gd->gtk_len, gd->keyidx);
671 os_memset(gtk_buf, 0, sizeof(gtk_buf));
672 return -1;
673 }
674 os_memset(gtk_buf, 0, sizeof(gtk_buf));
675
676 return 0;
677 }
678
679
wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm * sm,int tx)680 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
681 int tx)
682 {
683 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
684 /* Ignore Tx bit for GTK if a pairwise key is used. One AP
685 * seemed to set this bit (incorrectly, since Tx is only when
686 * doing Group Key only APs) and without this workaround, the
687 * data connection does not work because wpa_supplicant
688 * configured non-zero keyidx to be used for unicast. */
689 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
690 "WPA: Tx bit set for GTK, but pairwise "
691 "keys are used - ignore Tx bit");
692 return 0;
693 }
694 return tx;
695 }
696
697
wpa_supplicant_pairwise_gtk(struct wpa_sm * sm,const struct wpa_eapol_key * key,const u8 * gtk,size_t gtk_len,int key_info)698 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
699 const struct wpa_eapol_key *key,
700 const u8 *gtk, size_t gtk_len,
701 int key_info)
702 {
703 struct wpa_gtk_data gd;
704
705 /*
706 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
707 * GTK KDE format:
708 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
709 * Reserved [bits 0-7]
710 * GTK
711 */
712
713 os_memset(&gd, 0, sizeof(gd));
714 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
715 gtk, gtk_len);
716
717 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
718 return -1;
719
720 gd.keyidx = gtk[0] & 0x3;
721 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
722 !!(gtk[0] & BIT(2)));
723 gtk += 2;
724 gtk_len -= 2;
725
726 os_memcpy(gd.gtk, gtk, gtk_len);
727 gd.gtk_len = gtk_len;
728
729 if (sm->group_cipher != WPA_CIPHER_GTK_NOT_USED &&
730 (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
731 gtk_len, gtk_len,
732 &gd.key_rsc_len, &gd.alg) ||
733 wpa_supplicant_install_gtk(sm, &gd, key->key_rsc))) {
734 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
735 "RSN: Failed to install GTK");
736 os_memset(&gd, 0, sizeof(gd));
737 return -1;
738 }
739 os_memset(&gd, 0, sizeof(gd));
740
741 wpa_supplicant_key_neg_complete(sm, sm->bssid,
742 key_info & WPA_KEY_INFO_SECURE);
743 return 0;
744 }
745
746
ieee80211w_set_keys(struct wpa_sm * sm,struct wpa_eapol_ie_parse * ie)747 static int ieee80211w_set_keys(struct wpa_sm *sm,
748 struct wpa_eapol_ie_parse *ie)
749 {
750 #ifdef CONFIG_IEEE80211W
751 if (!wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher))
752 return 0;
753
754 if (ie->igtk) {
755 size_t len;
756 const struct wpa_igtk_kde *igtk;
757 u16 keyidx;
758 len = wpa_cipher_key_len(sm->mgmt_group_cipher);
759 if (ie->igtk_len != WPA_IGTK_KDE_PREFIX_LEN + len)
760 return -1;
761 igtk = (const struct wpa_igtk_kde *) ie->igtk;
762 keyidx = WPA_GET_LE16(igtk->keyid);
763 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: IGTK keyid %d "
764 "pn %02x%02x%02x%02x%02x%02x",
765 keyidx, MAC2STR(igtk->pn));
766 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK",
767 igtk->igtk, len);
768 if (keyidx > 4095) {
769 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
770 "WPA: Invalid IGTK KeyID %d", keyidx);
771 return -1;
772 }
773 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
774 broadcast_ether_addr,
775 keyidx, 0, igtk->pn, sizeof(igtk->pn),
776 igtk->igtk, len) < 0) {
777 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
778 "WPA: Failed to configure IGTK to the driver");
779 return -1;
780 }
781 }
782
783 return 0;
784 #else /* CONFIG_IEEE80211W */
785 return 0;
786 #endif /* CONFIG_IEEE80211W */
787 }
788
789
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)790 static void wpa_report_ie_mismatch(struct wpa_sm *sm,
791 const char *reason, const u8 *src_addr,
792 const u8 *wpa_ie, size_t wpa_ie_len,
793 const u8 *rsn_ie, size_t rsn_ie_len)
794 {
795 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
796 reason, MAC2STR(src_addr));
797
798 if (sm->ap_wpa_ie) {
799 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
800 sm->ap_wpa_ie, sm->ap_wpa_ie_len);
801 }
802 if (wpa_ie) {
803 if (!sm->ap_wpa_ie) {
804 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
805 "WPA: No WPA IE in Beacon/ProbeResp");
806 }
807 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
808 wpa_ie, wpa_ie_len);
809 }
810
811 if (sm->ap_rsn_ie) {
812 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
813 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
814 }
815 if (rsn_ie) {
816 if (!sm->ap_rsn_ie) {
817 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
818 "WPA: No RSN IE in Beacon/ProbeResp");
819 }
820 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
821 rsn_ie, rsn_ie_len);
822 }
823
824 wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
825 }
826
827
828 #ifdef CONFIG_IEEE80211R
829
ft_validate_mdie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie,const u8 * assoc_resp_mdie)830 static int ft_validate_mdie(struct wpa_sm *sm,
831 const unsigned char *src_addr,
832 struct wpa_eapol_ie_parse *ie,
833 const u8 *assoc_resp_mdie)
834 {
835 struct rsn_mdie *mdie;
836
837 mdie = (struct rsn_mdie *) (ie->mdie + 2);
838 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
839 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
840 MOBILITY_DOMAIN_ID_LEN) != 0) {
841 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did "
842 "not match with the current mobility domain");
843 return -1;
844 }
845
846 if (assoc_resp_mdie &&
847 (assoc_resp_mdie[1] != ie->mdie[1] ||
848 os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) {
849 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch");
850 wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4",
851 ie->mdie, 2 + ie->mdie[1]);
852 wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response",
853 assoc_resp_mdie, 2 + assoc_resp_mdie[1]);
854 return -1;
855 }
856
857 return 0;
858 }
859
860
ft_validate_ftie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie,const u8 * assoc_resp_ftie)861 static int ft_validate_ftie(struct wpa_sm *sm,
862 const unsigned char *src_addr,
863 struct wpa_eapol_ie_parse *ie,
864 const u8 *assoc_resp_ftie)
865 {
866 if (ie->ftie == NULL) {
867 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
868 "FT: No FTIE in EAPOL-Key msg 3/4");
869 return -1;
870 }
871
872 if (assoc_resp_ftie == NULL)
873 return 0;
874
875 if (assoc_resp_ftie[1] != ie->ftie[1] ||
876 os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) {
877 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch");
878 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4",
879 ie->ftie, 2 + ie->ftie[1]);
880 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response",
881 assoc_resp_ftie, 2 + assoc_resp_ftie[1]);
882 return -1;
883 }
884
885 return 0;
886 }
887
888
ft_validate_rsnie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)889 static int ft_validate_rsnie(struct wpa_sm *sm,
890 const unsigned char *src_addr,
891 struct wpa_eapol_ie_parse *ie)
892 {
893 struct wpa_ie_data rsn;
894
895 if (!ie->rsn_ie)
896 return 0;
897
898 /*
899 * Verify that PMKR1Name from EAPOL-Key message 3/4
900 * matches with the value we derived.
901 */
902 if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 ||
903 rsn.num_pmkid != 1 || rsn.pmkid == NULL) {
904 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in "
905 "FT 4-way handshake message 3/4");
906 return -1;
907 }
908
909 if (os_memcmp_const(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
910 {
911 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
912 "FT: PMKR1Name mismatch in "
913 "FT 4-way handshake message 3/4");
914 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator",
915 rsn.pmkid, WPA_PMK_NAME_LEN);
916 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
917 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
918 return -1;
919 }
920
921 return 0;
922 }
923
924
wpa_supplicant_validate_ie_ft(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)925 static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm,
926 const unsigned char *src_addr,
927 struct wpa_eapol_ie_parse *ie)
928 {
929 const u8 *pos, *end, *mdie = NULL, *ftie = NULL;
930
931 if (sm->assoc_resp_ies) {
932 pos = sm->assoc_resp_ies;
933 end = pos + sm->assoc_resp_ies_len;
934 while (pos + 2 < end) {
935 if (pos + 2 + pos[1] > end)
936 break;
937 switch (*pos) {
938 case WLAN_EID_MOBILITY_DOMAIN:
939 mdie = pos;
940 break;
941 case WLAN_EID_FAST_BSS_TRANSITION:
942 ftie = pos;
943 break;
944 }
945 pos += 2 + pos[1];
946 }
947 }
948
949 if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 ||
950 ft_validate_ftie(sm, src_addr, ie, ftie) < 0 ||
951 ft_validate_rsnie(sm, src_addr, ie) < 0)
952 return -1;
953
954 return 0;
955 }
956
957 #endif /* CONFIG_IEEE80211R */
958
959
wpa_supplicant_validate_ie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)960 static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
961 const unsigned char *src_addr,
962 struct wpa_eapol_ie_parse *ie)
963 {
964 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
965 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
966 "WPA: No WPA/RSN IE for this AP known. "
967 "Trying to get from scan results");
968 if (wpa_sm_get_beacon_ie(sm) < 0) {
969 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
970 "WPA: Could not find AP from "
971 "the scan results");
972 } else {
973 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
974 "WPA: Found the current AP from "
975 "updated scan results");
976 }
977 }
978
979 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
980 (sm->ap_wpa_ie || sm->ap_rsn_ie)) {
981 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
982 "with IE in Beacon/ProbeResp (no IE?)",
983 src_addr, ie->wpa_ie, ie->wpa_ie_len,
984 ie->rsn_ie, ie->rsn_ie_len);
985 return -1;
986 }
987
988 if ((ie->wpa_ie && sm->ap_wpa_ie &&
989 (ie->wpa_ie_len != sm->ap_wpa_ie_len ||
990 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
991 (ie->rsn_ie && sm->ap_rsn_ie &&
992 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
993 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
994 ie->rsn_ie, ie->rsn_ie_len))) {
995 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
996 "with IE in Beacon/ProbeResp",
997 src_addr, ie->wpa_ie, ie->wpa_ie_len,
998 ie->rsn_ie, ie->rsn_ie_len);
999 return -1;
1000 }
1001
1002 if (sm->proto == WPA_PROTO_WPA &&
1003 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
1004 wpa_report_ie_mismatch(sm, "Possible downgrade attack "
1005 "detected - RSN was enabled and RSN IE "
1006 "was in msg 3/4, but not in "
1007 "Beacon/ProbeResp",
1008 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1009 ie->rsn_ie, ie->rsn_ie_len);
1010 return -1;
1011 }
1012
1013 #ifdef CONFIG_IEEE80211R
1014 if (wpa_key_mgmt_ft(sm->key_mgmt) &&
1015 wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0)
1016 return -1;
1017 #endif /* CONFIG_IEEE80211R */
1018
1019 return 0;
1020 }
1021
1022
1023 /**
1024 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
1025 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1026 * @dst: Destination address for the frame
1027 * @key: Pointer to the EAPOL-Key frame header
1028 * @ver: Version bits from EAPOL-Key Key Info
1029 * @key_info: Key Info
1030 * @ptk: PTK to use for keyed hash and encryption
1031 * Returns: 0 on success, -1 on failure
1032 */
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,struct wpa_ptk * ptk)1033 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
1034 const struct wpa_eapol_key *key,
1035 u16 ver, u16 key_info,
1036 struct wpa_ptk *ptk)
1037 {
1038 size_t rlen;
1039 struct wpa_eapol_key *reply;
1040 u8 *rbuf;
1041
1042 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1043 sizeof(*reply), &rlen, (void *) &reply);
1044 if (rbuf == NULL)
1045 return -1;
1046
1047 reply->type = (sm->proto == WPA_PROTO_RSN ||
1048 sm->proto == WPA_PROTO_OSEN) ?
1049 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1050 key_info &= WPA_KEY_INFO_SECURE;
1051 key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC;
1052 WPA_PUT_BE16(reply->key_info, key_info);
1053 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
1054 WPA_PUT_BE16(reply->key_length, 0);
1055 else
1056 os_memcpy(reply->key_length, key->key_length, 2);
1057 os_memcpy(reply->replay_counter, key->replay_counter,
1058 WPA_REPLAY_COUNTER_LEN);
1059
1060 WPA_PUT_BE16(reply->key_data_length, 0);
1061
1062 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
1063 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
1064 rbuf, rlen, reply->key_mic);
1065
1066 return 0;
1067 }
1068
1069
wpa_supplicant_process_3_of_4(struct wpa_sm * sm,const struct wpa_eapol_key * key,u16 ver,const u8 * key_data,size_t key_data_len)1070 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
1071 const struct wpa_eapol_key *key,
1072 u16 ver, const u8 *key_data,
1073 size_t key_data_len)
1074 {
1075 u16 key_info, keylen;
1076 struct wpa_eapol_ie_parse ie;
1077
1078 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
1079 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way "
1080 "Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
1081
1082 key_info = WPA_GET_BE16(key->key_info);
1083
1084 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", key_data, key_data_len);
1085 if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
1086 goto failed;
1087 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1088 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1089 "WPA: GTK IE in unencrypted key data");
1090 goto failed;
1091 }
1092 #ifdef CONFIG_IEEE80211W
1093 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1094 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1095 "WPA: IGTK KDE in unencrypted key data");
1096 goto failed;
1097 }
1098
1099 if (ie.igtk &&
1100 wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher) &&
1101 ie.igtk_len != WPA_IGTK_KDE_PREFIX_LEN +
1102 (unsigned int) wpa_cipher_key_len(sm->mgmt_group_cipher)) {
1103 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1104 "WPA: Invalid IGTK KDE length %lu",
1105 (unsigned long) ie.igtk_len);
1106 goto failed;
1107 }
1108 #endif /* CONFIG_IEEE80211W */
1109
1110 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
1111 goto failed;
1112
1113 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
1114 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1115 "WPA: ANonce from message 1 of 4-Way Handshake "
1116 "differs from 3 of 4-Way Handshake - drop packet (src="
1117 MACSTR ")", MAC2STR(sm->bssid));
1118 goto failed;
1119 }
1120
1121 keylen = WPA_GET_BE16(key->key_length);
1122 if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) {
1123 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1124 "WPA: Invalid %s key length %d (src=" MACSTR
1125 ")", wpa_cipher_txt(sm->pairwise_cipher), keylen,
1126 MAC2STR(sm->bssid));
1127 goto failed;
1128 }
1129
1130 #ifdef CONFIG_P2P
1131 if (ie.ip_addr_alloc) {
1132 os_memcpy(sm->p2p_ip_addr, ie.ip_addr_alloc, 3 * 4);
1133 wpa_hexdump(MSG_DEBUG, "P2P: IP address info",
1134 sm->p2p_ip_addr, sizeof(sm->p2p_ip_addr));
1135 }
1136 #endif /* CONFIG_P2P */
1137
1138 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
1139 &sm->ptk)) {
1140 goto failed;
1141 }
1142
1143 /* SNonce was successfully used in msg 3/4, so mark it to be renewed
1144 * for the next 4-Way Handshake. If msg 3 is received again, the old
1145 * SNonce will still be used to avoid changing PTK. */
1146 sm->renew_snonce = 1;
1147
1148 if (key_info & WPA_KEY_INFO_INSTALL) {
1149 if (wpa_supplicant_install_ptk(sm, key))
1150 goto failed;
1151 }
1152
1153 if (key_info & WPA_KEY_INFO_SECURE) {
1154 wpa_sm_mlme_setprotection(
1155 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
1156 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
1157 eapol_sm_notify_portValid(sm->eapol, TRUE);
1158 }
1159 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1160
1161 if (sm->group_cipher == WPA_CIPHER_GTK_NOT_USED) {
1162 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1163 key_info & WPA_KEY_INFO_SECURE);
1164 } else if (ie.gtk &&
1165 wpa_supplicant_pairwise_gtk(sm, key,
1166 ie.gtk, ie.gtk_len, key_info) < 0) {
1167 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1168 "RSN: Failed to configure GTK");
1169 goto failed;
1170 }
1171
1172 if (ieee80211w_set_keys(sm, &ie) < 0) {
1173 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1174 "RSN: Failed to configure IGTK");
1175 goto failed;
1176 }
1177
1178 if (ie.gtk)
1179 wpa_sm_set_rekey_offload(sm);
1180
1181 return;
1182
1183 failed:
1184 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1185 }
1186
1187
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)1188 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
1189 const u8 *keydata,
1190 size_t keydatalen,
1191 u16 key_info,
1192 struct wpa_gtk_data *gd)
1193 {
1194 int maxkeylen;
1195 struct wpa_eapol_ie_parse ie;
1196
1197 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen);
1198 if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0)
1199 return -1;
1200 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1201 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1202 "WPA: GTK IE in unencrypted key data");
1203 return -1;
1204 }
1205 if (ie.gtk == NULL) {
1206 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1207 "WPA: No GTK IE in Group Key msg 1/2");
1208 return -1;
1209 }
1210 maxkeylen = gd->gtk_len = ie.gtk_len - 2;
1211
1212 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
1213 gd->gtk_len, maxkeylen,
1214 &gd->key_rsc_len, &gd->alg))
1215 return -1;
1216
1217 wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake",
1218 ie.gtk, ie.gtk_len);
1219 gd->keyidx = ie.gtk[0] & 0x3;
1220 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
1221 !!(ie.gtk[0] & BIT(2)));
1222 if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
1223 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1224 "RSN: Too long GTK in GTK IE (len=%lu)",
1225 (unsigned long) ie.gtk_len - 2);
1226 return -1;
1227 }
1228 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
1229
1230 if (ieee80211w_set_keys(sm, &ie) < 0)
1231 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1232 "RSN: Failed to configure IGTK");
1233
1234 return 0;
1235 }
1236
1237
wpa_supplicant_process_1_of_2_wpa(struct wpa_sm * sm,const struct wpa_eapol_key * key,const u8 * key_data,size_t key_data_len,u16 key_info,u16 ver,struct wpa_gtk_data * gd)1238 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
1239 const struct wpa_eapol_key *key,
1240 const u8 *key_data,
1241 size_t key_data_len, u16 key_info,
1242 u16 ver, struct wpa_gtk_data *gd)
1243 {
1244 size_t maxkeylen;
1245
1246 gd->gtk_len = WPA_GET_BE16(key->key_length);
1247 maxkeylen = key_data_len;
1248 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1249 if (maxkeylen < 8) {
1250 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1251 "WPA: Too short maxkeylen (%lu)",
1252 (unsigned long) maxkeylen);
1253 return -1;
1254 }
1255 maxkeylen -= 8;
1256 }
1257
1258 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
1259 gd->gtk_len, maxkeylen,
1260 &gd->key_rsc_len, &gd->alg))
1261 return -1;
1262
1263 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1264 WPA_KEY_INFO_KEY_INDEX_SHIFT;
1265 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1266 u8 ek[32];
1267 if (key_data_len > sizeof(gd->gtk)) {
1268 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1269 "WPA: RC4 key data too long (%lu)",
1270 (unsigned long) key_data_len);
1271 return -1;
1272 }
1273 os_memcpy(ek, key->key_iv, 16);
1274 os_memcpy(ek + 16, sm->ptk.kek, 16);
1275 os_memcpy(gd->gtk, key_data, key_data_len);
1276 if (rc4_skip(ek, 32, 256, gd->gtk, key_data_len)) {
1277 os_memset(ek, 0, sizeof(ek));
1278 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1279 "WPA: RC4 failed");
1280 return -1;
1281 }
1282 os_memset(ek, 0, sizeof(ek));
1283 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1284 if (maxkeylen % 8) {
1285 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1286 "WPA: Unsupported AES-WRAP len %lu",
1287 (unsigned long) maxkeylen);
1288 return -1;
1289 }
1290 if (maxkeylen > sizeof(gd->gtk)) {
1291 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1292 "WPA: AES-WRAP key data "
1293 "too long (keydatalen=%lu maxkeylen=%lu)",
1294 (unsigned long) key_data_len,
1295 (unsigned long) maxkeylen);
1296 return -1;
1297 }
1298 if (aes_unwrap(sm->ptk.kek, 16, maxkeylen / 8, key_data,
1299 gd->gtk)) {
1300 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1301 "WPA: AES unwrap failed - could not decrypt "
1302 "GTK");
1303 return -1;
1304 }
1305 } else {
1306 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1307 "WPA: Unsupported key_info type %d", ver);
1308 return -1;
1309 }
1310 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1311 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1312 return 0;
1313 }
1314
1315
wpa_supplicant_send_2_of_2(struct wpa_sm * sm,const struct wpa_eapol_key * key,int ver,u16 key_info)1316 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1317 const struct wpa_eapol_key *key,
1318 int ver, u16 key_info)
1319 {
1320 size_t rlen;
1321 struct wpa_eapol_key *reply;
1322 u8 *rbuf;
1323
1324 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1325 sizeof(*reply), &rlen, (void *) &reply);
1326 if (rbuf == NULL)
1327 return -1;
1328
1329 reply->type = (sm->proto == WPA_PROTO_RSN ||
1330 sm->proto == WPA_PROTO_OSEN) ?
1331 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1332 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1333 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
1334 WPA_PUT_BE16(reply->key_info, key_info);
1335 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
1336 WPA_PUT_BE16(reply->key_length, 0);
1337 else
1338 os_memcpy(reply->key_length, key->key_length, 2);
1339 os_memcpy(reply->replay_counter, key->replay_counter,
1340 WPA_REPLAY_COUNTER_LEN);
1341
1342 WPA_PUT_BE16(reply->key_data_length, 0);
1343
1344 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1345 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL,
1346 rbuf, rlen, reply->key_mic);
1347
1348 return 0;
1349 }
1350
1351
wpa_supplicant_process_1_of_2(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,const u8 * key_data,size_t key_data_len,u16 ver)1352 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1353 const unsigned char *src_addr,
1354 const struct wpa_eapol_key *key,
1355 const u8 *key_data,
1356 size_t key_data_len, u16 ver)
1357 {
1358 u16 key_info;
1359 int rekey, ret;
1360 struct wpa_gtk_data gd;
1361
1362 os_memset(&gd, 0, sizeof(gd));
1363
1364 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1365 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key "
1366 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1367
1368 key_info = WPA_GET_BE16(key->key_info);
1369
1370 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
1371 ret = wpa_supplicant_process_1_of_2_rsn(sm, key_data,
1372 key_data_len, key_info,
1373 &gd);
1374 } else {
1375 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, key_data,
1376 key_data_len,
1377 key_info, ver, &gd);
1378 }
1379
1380 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1381
1382 if (ret)
1383 goto failed;
1384
1385 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) ||
1386 wpa_supplicant_send_2_of_2(sm, key, ver, key_info))
1387 goto failed;
1388
1389 if (rekey) {
1390 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying "
1391 "completed with " MACSTR " [GTK=%s]",
1392 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1393 wpa_sm_cancel_auth_timeout(sm);
1394 wpa_sm_set_state(sm, WPA_COMPLETED);
1395 } else {
1396 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1397 key_info &
1398 WPA_KEY_INFO_SECURE);
1399 }
1400
1401 wpa_sm_set_rekey_offload(sm);
1402
1403 return;
1404
1405 failed:
1406 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1407 }
1408
1409
wpa_supplicant_verify_eapol_key_mic(struct wpa_sm * sm,struct wpa_eapol_key * key,u16 ver,const u8 * buf,size_t len)1410 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1411 struct wpa_eapol_key *key,
1412 u16 ver,
1413 const u8 *buf, size_t len)
1414 {
1415 u8 mic[16];
1416 int ok = 0;
1417
1418 os_memcpy(mic, key->key_mic, 16);
1419 if (sm->tptk_set) {
1420 os_memset(key->key_mic, 0, 16);
1421 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len,
1422 key->key_mic);
1423 if (os_memcmp_const(mic, key->key_mic, 16) != 0) {
1424 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1425 "WPA: Invalid EAPOL-Key MIC "
1426 "when using TPTK - ignoring TPTK");
1427 } else {
1428 ok = 1;
1429 sm->tptk_set = 0;
1430 sm->ptk_set = 1;
1431 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1432 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
1433 }
1434 }
1435
1436 if (!ok && sm->ptk_set) {
1437 os_memset(key->key_mic, 0, 16);
1438 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len,
1439 key->key_mic);
1440 if (os_memcmp_const(mic, key->key_mic, 16) != 0) {
1441 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1442 "WPA: Invalid EAPOL-Key MIC - "
1443 "dropping packet");
1444 return -1;
1445 }
1446 ok = 1;
1447 }
1448
1449 if (!ok) {
1450 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1451 "WPA: Could not verify EAPOL-Key MIC - "
1452 "dropping packet");
1453 return -1;
1454 }
1455
1456 os_memcpy(sm->rx_replay_counter, key->replay_counter,
1457 WPA_REPLAY_COUNTER_LEN);
1458 sm->rx_replay_counter_set = 1;
1459 return 0;
1460 }
1461
1462
1463 /* 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,u8 * key_data,size_t * key_data_len)1464 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1465 struct wpa_eapol_key *key, u16 ver,
1466 u8 *key_data, size_t *key_data_len)
1467 {
1468 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1469 key_data, *key_data_len);
1470 if (!sm->ptk_set) {
1471 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1472 "WPA: PTK not available, cannot decrypt EAPOL-Key Key "
1473 "Data");
1474 return -1;
1475 }
1476
1477 /* Decrypt key data here so that this operation does not need
1478 * to be implemented separately for each message type. */
1479 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1480 u8 ek[32];
1481 os_memcpy(ek, key->key_iv, 16);
1482 os_memcpy(ek + 16, sm->ptk.kek, 16);
1483 if (rc4_skip(ek, 32, 256, key_data, *key_data_len)) {
1484 os_memset(ek, 0, sizeof(ek));
1485 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1486 "WPA: RC4 failed");
1487 return -1;
1488 }
1489 os_memset(ek, 0, sizeof(ek));
1490 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1491 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC ||
1492 sm->key_mgmt == WPA_KEY_MGMT_OSEN) {
1493 u8 *buf;
1494 if (*key_data_len < 8 || *key_data_len % 8) {
1495 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1496 "WPA: Unsupported AES-WRAP len %u",
1497 (unsigned int) *key_data_len);
1498 return -1;
1499 }
1500 *key_data_len -= 8; /* AES-WRAP adds 8 bytes */
1501 buf = os_malloc(*key_data_len);
1502 if (buf == NULL) {
1503 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1504 "WPA: No memory for AES-UNWRAP buffer");
1505 return -1;
1506 }
1507 if (aes_unwrap(sm->ptk.kek, 16, *key_data_len / 8,
1508 key_data, buf)) {
1509 os_free(buf);
1510 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1511 "WPA: AES unwrap failed - "
1512 "could not decrypt EAPOL-Key key data");
1513 return -1;
1514 }
1515 os_memcpy(key_data, buf, *key_data_len);
1516 os_free(buf);
1517 WPA_PUT_BE16(key->key_data_length, *key_data_len);
1518 } else {
1519 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1520 "WPA: Unsupported key_info type %d", ver);
1521 return -1;
1522 }
1523 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1524 key_data, *key_data_len);
1525 return 0;
1526 }
1527
1528
1529 /**
1530 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1531 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1532 */
wpa_sm_aborted_cached(struct wpa_sm * sm)1533 void wpa_sm_aborted_cached(struct wpa_sm *sm)
1534 {
1535 if (sm && sm->cur_pmksa) {
1536 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1537 "RSN: Cancelling PMKSA caching attempt");
1538 sm->cur_pmksa = NULL;
1539 }
1540 }
1541
1542
wpa_eapol_key_dump(struct wpa_sm * sm,const struct wpa_eapol_key * key)1543 static void wpa_eapol_key_dump(struct wpa_sm *sm,
1544 const struct wpa_eapol_key *key)
1545 {
1546 #ifndef CONFIG_NO_STDOUT_DEBUG
1547 u16 key_info = WPA_GET_BE16(key->key_info);
1548
1549 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type);
1550 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1551 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)",
1552 key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1553 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1554 WPA_KEY_INFO_KEY_INDEX_SHIFT,
1555 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1556 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1557 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1558 key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1559 key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1560 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1561 key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1562 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1563 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1564 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1565 " key_length=%u key_data_length=%u",
1566 WPA_GET_BE16(key->key_length),
1567 WPA_GET_BE16(key->key_data_length));
1568 wpa_hexdump(MSG_DEBUG, " replay_counter",
1569 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1570 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN);
1571 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16);
1572 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8);
1573 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8);
1574 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16);
1575 #endif /* CONFIG_NO_STDOUT_DEBUG */
1576 }
1577
1578
1579 /**
1580 * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1581 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1582 * @src_addr: Source MAC address of the EAPOL packet
1583 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1584 * @len: Length of the EAPOL frame
1585 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1586 *
1587 * This function is called for each received EAPOL frame. Other than EAPOL-Key
1588 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1589 * only processing WPA and WPA2 EAPOL-Key frames.
1590 *
1591 * The received EAPOL-Key packets are validated and valid packets are replied
1592 * to. In addition, key material (PTK, GTK) is configured at the end of a
1593 * successful key handshake.
1594 */
wpa_sm_rx_eapol(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1595 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1596 const u8 *buf, size_t len)
1597 {
1598 size_t plen, data_len, key_data_len;
1599 const struct ieee802_1x_hdr *hdr;
1600 struct wpa_eapol_key *key;
1601 u16 key_info, ver;
1602 u8 *tmp = NULL;
1603 int ret = -1;
1604 struct wpa_peerkey *peerkey = NULL;
1605 u8 *key_data;
1606
1607 #ifdef CONFIG_IEEE80211R
1608 sm->ft_completed = 0;
1609 #endif /* CONFIG_IEEE80211R */
1610
1611 if (len < sizeof(*hdr) + sizeof(*key)) {
1612 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1613 "WPA: EAPOL frame too short to be a WPA "
1614 "EAPOL-Key (len %lu, expecting at least %lu)",
1615 (unsigned long) len,
1616 (unsigned long) sizeof(*hdr) + sizeof(*key));
1617 return 0;
1618 }
1619
1620 hdr = (const struct ieee802_1x_hdr *) buf;
1621 plen = be_to_host16(hdr->length);
1622 data_len = plen + sizeof(*hdr);
1623 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1624 "IEEE 802.1X RX: version=%d type=%d length=%lu",
1625 hdr->version, hdr->type, (unsigned long) plen);
1626
1627 if (hdr->version < EAPOL_VERSION) {
1628 /* TODO: backwards compatibility */
1629 }
1630 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1631 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1632 "WPA: EAPOL frame (type %u) discarded, "
1633 "not a Key frame", hdr->type);
1634 ret = 0;
1635 goto out;
1636 }
1637 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", buf, len);
1638 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
1639 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1640 "WPA: EAPOL frame payload size %lu "
1641 "invalid (frame size %lu)",
1642 (unsigned long) plen, (unsigned long) len);
1643 ret = 0;
1644 goto out;
1645 }
1646 if (data_len < len) {
1647 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1648 "WPA: ignoring %lu bytes after the IEEE 802.1X data",
1649 (unsigned long) len - data_len);
1650 }
1651
1652 /*
1653 * Make a copy of the frame since we need to modify the buffer during
1654 * MAC validation and Key Data decryption.
1655 */
1656 tmp = os_malloc(data_len);
1657 if (tmp == NULL)
1658 goto out;
1659 os_memcpy(tmp, buf, data_len);
1660 key = (struct wpa_eapol_key *) (tmp + sizeof(struct ieee802_1x_hdr));
1661 key_data = (u8 *) (key + 1);
1662
1663 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1664 {
1665 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1666 "WPA: EAPOL-Key type (%d) unknown, discarded",
1667 key->type);
1668 ret = 0;
1669 goto out;
1670 }
1671 wpa_eapol_key_dump(sm, key);
1672
1673 key_data_len = WPA_GET_BE16(key->key_data_length);
1674 if (key_data_len > plen - sizeof(struct wpa_eapol_key)) {
1675 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1676 "frame - key_data overflow (%u > %u)",
1677 (unsigned int) key_data_len,
1678 (unsigned int) (plen - sizeof(struct wpa_eapol_key)));
1679 goto out;
1680 }
1681
1682 eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1683 key_info = WPA_GET_BE16(key->key_info);
1684 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1685 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1686 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
1687 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1688 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
1689 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
1690 sm->key_mgmt != WPA_KEY_MGMT_OSEN) {
1691 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1692 "WPA: Unsupported EAPOL-Key descriptor version %d",
1693 ver);
1694 goto out;
1695 }
1696
1697 if (sm->key_mgmt == WPA_KEY_MGMT_OSEN &&
1698 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1699 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1700 "OSEN: Unsupported EAPOL-Key descriptor version %d",
1701 ver);
1702 goto out;
1703 }
1704
1705 #ifdef CONFIG_IEEE80211R
1706 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
1707 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
1708 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1709 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1710 "FT: AP did not use AES-128-CMAC");
1711 goto out;
1712 }
1713 } else
1714 #endif /* CONFIG_IEEE80211R */
1715 #ifdef CONFIG_IEEE80211W
1716 if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
1717 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1718 sm->key_mgmt != WPA_KEY_MGMT_OSEN) {
1719 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1720 "WPA: AP did not use the "
1721 "negotiated AES-128-CMAC");
1722 goto out;
1723 }
1724 } else
1725 #endif /* CONFIG_IEEE80211W */
1726 if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
1727 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1728 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1729 "WPA: CCMP is used, but EAPOL-Key "
1730 "descriptor version (%d) is not 2", ver);
1731 if (sm->group_cipher != WPA_CIPHER_CCMP &&
1732 !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1733 /* Earlier versions of IEEE 802.11i did not explicitly
1734 * require version 2 descriptor for all EAPOL-Key
1735 * packets, so allow group keys to use version 1 if
1736 * CCMP is not used for them. */
1737 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1738 "WPA: Backwards compatibility: allow invalid "
1739 "version for non-CCMP group keys");
1740 } else if (ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1741 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1742 "WPA: Interoperability workaround: allow incorrect (should have been HMAC-SHA1), but stronger (is AES-128-CMAC), descriptor version to be used");
1743 } else
1744 goto out;
1745 } else if (sm->pairwise_cipher == WPA_CIPHER_GCMP &&
1746 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1747 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1748 "WPA: GCMP is used, but EAPOL-Key "
1749 "descriptor version (%d) is not 2", ver);
1750 goto out;
1751 }
1752
1753 #ifdef CONFIG_PEERKEY
1754 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
1755 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
1756 break;
1757 }
1758
1759 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
1760 if (!peerkey->initiator && peerkey->replay_counter_set &&
1761 os_memcmp(key->replay_counter, peerkey->replay_counter,
1762 WPA_REPLAY_COUNTER_LEN) <= 0) {
1763 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1764 "RSN: EAPOL-Key Replay Counter did not "
1765 "increase (STK) - dropping packet");
1766 goto out;
1767 } else if (peerkey->initiator) {
1768 u8 _tmp[WPA_REPLAY_COUNTER_LEN];
1769 os_memcpy(_tmp, key->replay_counter,
1770 WPA_REPLAY_COUNTER_LEN);
1771 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
1772 if (os_memcmp(_tmp, peerkey->replay_counter,
1773 WPA_REPLAY_COUNTER_LEN) != 0) {
1774 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1775 "RSN: EAPOL-Key Replay "
1776 "Counter did not match (STK) - "
1777 "dropping packet");
1778 goto out;
1779 }
1780 }
1781 }
1782
1783 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
1784 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1785 "RSN: Ack bit in key_info from STK peer");
1786 goto out;
1787 }
1788 #endif /* CONFIG_PEERKEY */
1789
1790 if (!peerkey && sm->rx_replay_counter_set &&
1791 os_memcmp(key->replay_counter, sm->rx_replay_counter,
1792 WPA_REPLAY_COUNTER_LEN) <= 0) {
1793 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1794 "WPA: EAPOL-Key Replay Counter did not increase - "
1795 "dropping packet");
1796 goto out;
1797 }
1798
1799 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
1800 #ifdef CONFIG_PEERKEY
1801 && (peerkey == NULL || !peerkey->initiator)
1802 #endif /* CONFIG_PEERKEY */
1803 ) {
1804 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1805 "WPA: No Ack bit in key_info");
1806 goto out;
1807 }
1808
1809 if (key_info & WPA_KEY_INFO_REQUEST) {
1810 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1811 "WPA: EAPOL-Key with Request bit - dropped");
1812 goto out;
1813 }
1814
1815 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
1816 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
1817 goto out;
1818
1819 #ifdef CONFIG_PEERKEY
1820 if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
1821 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len))
1822 goto out;
1823 #endif /* CONFIG_PEERKEY */
1824
1825 if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) &&
1826 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1827 if (wpa_supplicant_decrypt_key_data(sm, key, ver, key_data,
1828 &key_data_len))
1829 goto out;
1830 }
1831
1832 if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1833 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
1834 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1835 "WPA: Ignored EAPOL-Key (Pairwise) with "
1836 "non-zero key index");
1837 goto out;
1838 }
1839 if (peerkey) {
1840 /* PeerKey 4-Way Handshake */
1841 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver,
1842 key_data, key_data_len);
1843 } else if (key_info & WPA_KEY_INFO_MIC) {
1844 /* 3/4 4-Way Handshake */
1845 wpa_supplicant_process_3_of_4(sm, key, ver, key_data,
1846 key_data_len);
1847 } else {
1848 /* 1/4 4-Way Handshake */
1849 wpa_supplicant_process_1_of_4(sm, src_addr, key,
1850 ver, key_data,
1851 key_data_len);
1852 }
1853 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1854 /* PeerKey SMK Handshake */
1855 peerkey_rx_eapol_smk(sm, src_addr, key, key_data_len, key_info,
1856 ver);
1857 } else {
1858 if (key_info & WPA_KEY_INFO_MIC) {
1859 /* 1/2 Group Key Handshake */
1860 wpa_supplicant_process_1_of_2(sm, src_addr, key,
1861 key_data, key_data_len,
1862 ver);
1863 } else {
1864 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1865 "WPA: EAPOL-Key (Group) without Mic bit - "
1866 "dropped");
1867 }
1868 }
1869
1870 ret = 1;
1871
1872 out:
1873 os_free(tmp);
1874 return ret;
1875 }
1876
1877
1878 #ifdef CONFIG_CTRL_IFACE
wpa_key_mgmt_suite(struct wpa_sm * sm)1879 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
1880 {
1881 switch (sm->key_mgmt) {
1882 case WPA_KEY_MGMT_IEEE8021X:
1883 return ((sm->proto == WPA_PROTO_RSN ||
1884 sm->proto == WPA_PROTO_OSEN) ?
1885 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
1886 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
1887 case WPA_KEY_MGMT_PSK:
1888 return (sm->proto == WPA_PROTO_RSN ?
1889 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
1890 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
1891 #ifdef CONFIG_IEEE80211R
1892 case WPA_KEY_MGMT_FT_IEEE8021X:
1893 return RSN_AUTH_KEY_MGMT_FT_802_1X;
1894 case WPA_KEY_MGMT_FT_PSK:
1895 return RSN_AUTH_KEY_MGMT_FT_PSK;
1896 #endif /* CONFIG_IEEE80211R */
1897 #ifdef CONFIG_IEEE80211W
1898 case WPA_KEY_MGMT_IEEE8021X_SHA256:
1899 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
1900 case WPA_KEY_MGMT_PSK_SHA256:
1901 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
1902 #endif /* CONFIG_IEEE80211W */
1903 case WPA_KEY_MGMT_CCKM:
1904 return (sm->proto == WPA_PROTO_RSN ?
1905 RSN_AUTH_KEY_MGMT_CCKM:
1906 WPA_AUTH_KEY_MGMT_CCKM);
1907 case WPA_KEY_MGMT_WPA_NONE:
1908 return WPA_AUTH_KEY_MGMT_NONE;
1909 default:
1910 return 0;
1911 }
1912 }
1913
1914
1915 #define RSN_SUITE "%02x-%02x-%02x-%d"
1916 #define RSN_SUITE_ARG(s) \
1917 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
1918
1919 /**
1920 * wpa_sm_get_mib - Dump text list of MIB entries
1921 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1922 * @buf: Buffer for the list
1923 * @buflen: Length of the buffer
1924 * Returns: Number of bytes written to buffer
1925 *
1926 * This function is used fetch dot11 MIB variables.
1927 */
wpa_sm_get_mib(struct wpa_sm * sm,char * buf,size_t buflen)1928 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
1929 {
1930 char pmkid_txt[PMKID_LEN * 2 + 1];
1931 int rsna, ret;
1932 size_t len;
1933
1934 if (sm->cur_pmksa) {
1935 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
1936 sm->cur_pmksa->pmkid, PMKID_LEN);
1937 } else
1938 pmkid_txt[0] = '\0';
1939
1940 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
1941 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
1942 sm->proto == WPA_PROTO_RSN)
1943 rsna = 1;
1944 else
1945 rsna = 0;
1946
1947 ret = os_snprintf(buf, buflen,
1948 "dot11RSNAOptionImplemented=TRUE\n"
1949 "dot11RSNAPreauthenticationImplemented=TRUE\n"
1950 "dot11RSNAEnabled=%s\n"
1951 "dot11RSNAPreauthenticationEnabled=%s\n"
1952 "dot11RSNAConfigVersion=%d\n"
1953 "dot11RSNAConfigPairwiseKeysSupported=5\n"
1954 "dot11RSNAConfigGroupCipherSize=%d\n"
1955 "dot11RSNAConfigPMKLifetime=%d\n"
1956 "dot11RSNAConfigPMKReauthThreshold=%d\n"
1957 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
1958 "dot11RSNAConfigSATimeout=%d\n",
1959 rsna ? "TRUE" : "FALSE",
1960 rsna ? "TRUE" : "FALSE",
1961 RSN_VERSION,
1962 wpa_cipher_key_len(sm->group_cipher) * 8,
1963 sm->dot11RSNAConfigPMKLifetime,
1964 sm->dot11RSNAConfigPMKReauthThreshold,
1965 sm->dot11RSNAConfigSATimeout);
1966 if (ret < 0 || (size_t) ret >= buflen)
1967 return 0;
1968 len = ret;
1969
1970 ret = os_snprintf(
1971 buf + len, buflen - len,
1972 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
1973 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
1974 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
1975 "dot11RSNAPMKIDUsed=%s\n"
1976 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
1977 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
1978 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
1979 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
1980 "dot11RSNA4WayHandshakeFailures=%u\n",
1981 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1982 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1983 sm->pairwise_cipher)),
1984 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1985 sm->group_cipher)),
1986 pmkid_txt,
1987 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1988 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1989 sm->pairwise_cipher)),
1990 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1991 sm->group_cipher)),
1992 sm->dot11RSNA4WayHandshakeFailures);
1993 if (ret >= 0 && (size_t) ret < buflen)
1994 len += ret;
1995
1996 return (int) len;
1997 }
1998 #endif /* CONFIG_CTRL_IFACE */
1999
2000
wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx,enum pmksa_free_reason reason)2001 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
2002 void *ctx, enum pmksa_free_reason reason)
2003 {
2004 struct wpa_sm *sm = ctx;
2005 int deauth = 0;
2006
2007 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: "
2008 MACSTR " reason=%d", MAC2STR(entry->aa), reason);
2009
2010 if (sm->cur_pmksa == entry) {
2011 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2012 "RSN: %s current PMKSA entry",
2013 reason == PMKSA_REPLACE ? "replaced" : "removed");
2014 pmksa_cache_clear_current(sm);
2015
2016 /*
2017 * If an entry is simply being replaced, there's no need to
2018 * deauthenticate because it will be immediately re-added.
2019 * This happens when EAP authentication is completed again
2020 * (reauth or failed PMKSA caching attempt).
2021 */
2022 if (reason != PMKSA_REPLACE)
2023 deauth = 1;
2024 }
2025
2026 if (reason == PMKSA_EXPIRE &&
2027 (sm->pmk_len == entry->pmk_len &&
2028 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
2029 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2030 "RSN: deauthenticating due to expired PMK");
2031 pmksa_cache_clear_current(sm);
2032 deauth = 1;
2033 }
2034
2035 if (deauth) {
2036 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2037 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
2038 }
2039 }
2040
2041
2042 /**
2043 * wpa_sm_init - Initialize WPA state machine
2044 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
2045 * Returns: Pointer to the allocated WPA state machine data
2046 *
2047 * This function is used to allocate a new WPA state machine and the returned
2048 * value is passed to all WPA state machine calls.
2049 */
wpa_sm_init(struct wpa_sm_ctx * ctx)2050 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
2051 {
2052 struct wpa_sm *sm;
2053
2054 sm = os_zalloc(sizeof(*sm));
2055 if (sm == NULL)
2056 return NULL;
2057 dl_list_init(&sm->pmksa_candidates);
2058 sm->renew_snonce = 1;
2059 sm->ctx = ctx;
2060
2061 sm->dot11RSNAConfigPMKLifetime = 43200;
2062 sm->dot11RSNAConfigPMKReauthThreshold = 70;
2063 sm->dot11RSNAConfigSATimeout = 60;
2064
2065 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
2066 if (sm->pmksa == NULL) {
2067 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
2068 "RSN: PMKSA cache initialization failed");
2069 os_free(sm);
2070 return NULL;
2071 }
2072
2073 return sm;
2074 }
2075
2076
2077 /**
2078 * wpa_sm_deinit - Deinitialize WPA state machine
2079 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2080 */
wpa_sm_deinit(struct wpa_sm * sm)2081 void wpa_sm_deinit(struct wpa_sm *sm)
2082 {
2083 if (sm == NULL)
2084 return;
2085 pmksa_cache_deinit(sm->pmksa);
2086 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
2087 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
2088 os_free(sm->assoc_wpa_ie);
2089 os_free(sm->ap_wpa_ie);
2090 os_free(sm->ap_rsn_ie);
2091 os_free(sm->ctx);
2092 peerkey_deinit(sm);
2093 #ifdef CONFIG_IEEE80211R
2094 os_free(sm->assoc_resp_ies);
2095 #endif /* CONFIG_IEEE80211R */
2096 os_free(sm);
2097 }
2098
2099
2100 /**
2101 * wpa_sm_notify_assoc - Notify WPA state machine about association
2102 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2103 * @bssid: The BSSID of the new association
2104 *
2105 * This function is called to let WPA state machine know that the connection
2106 * was established.
2107 */
wpa_sm_notify_assoc(struct wpa_sm * sm,const u8 * bssid)2108 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
2109 {
2110 int clear_ptk = 1;
2111
2112 if (sm == NULL)
2113 return;
2114
2115 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2116 "WPA: Association event - clear replay counter");
2117 os_memcpy(sm->bssid, bssid, ETH_ALEN);
2118 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
2119 sm->rx_replay_counter_set = 0;
2120 sm->renew_snonce = 1;
2121 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
2122 rsn_preauth_deinit(sm);
2123
2124 #ifdef CONFIG_IEEE80211R
2125 if (wpa_ft_is_completed(sm)) {
2126 /*
2127 * Clear portValid to kick EAPOL state machine to re-enter
2128 * AUTHENTICATED state to get the EAPOL port Authorized.
2129 */
2130 eapol_sm_notify_portValid(sm->eapol, FALSE);
2131 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
2132
2133 /* Prepare for the next transition */
2134 wpa_ft_prepare_auth_request(sm, NULL);
2135
2136 clear_ptk = 0;
2137 }
2138 #endif /* CONFIG_IEEE80211R */
2139
2140 if (clear_ptk) {
2141 /*
2142 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
2143 * this is not part of a Fast BSS Transition.
2144 */
2145 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK");
2146 sm->ptk_set = 0;
2147 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
2148 sm->tptk_set = 0;
2149 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
2150 }
2151
2152 #ifdef CONFIG_TDLS
2153 wpa_tdls_assoc(sm);
2154 #endif /* CONFIG_TDLS */
2155
2156 #ifdef CONFIG_P2P
2157 os_memset(sm->p2p_ip_addr, 0, sizeof(sm->p2p_ip_addr));
2158 #endif /* CONFIG_P2P */
2159 }
2160
2161
2162 /**
2163 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
2164 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2165 *
2166 * This function is called to let WPA state machine know that the connection
2167 * was lost. This will abort any existing pre-authentication session.
2168 */
wpa_sm_notify_disassoc(struct wpa_sm * sm)2169 void wpa_sm_notify_disassoc(struct wpa_sm *sm)
2170 {
2171 peerkey_deinit(sm);
2172 rsn_preauth_deinit(sm);
2173 pmksa_cache_clear_current(sm);
2174 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
2175 sm->dot11RSNA4WayHandshakeFailures++;
2176 #ifdef CONFIG_TDLS
2177 wpa_tdls_disassoc(sm);
2178 #endif /* CONFIG_TDLS */
2179 }
2180
2181
2182 /**
2183 * wpa_sm_set_pmk - Set PMK
2184 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2185 * @pmk: The new PMK
2186 * @pmk_len: The length of the new PMK in bytes
2187 *
2188 * Configure the PMK for WPA state machine.
2189 */
wpa_sm_set_pmk(struct wpa_sm * sm,const u8 * pmk,size_t pmk_len)2190 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len)
2191 {
2192 if (sm == NULL)
2193 return;
2194
2195 sm->pmk_len = pmk_len;
2196 os_memcpy(sm->pmk, pmk, pmk_len);
2197
2198 #ifdef CONFIG_IEEE80211R
2199 /* Set XXKey to be PSK for FT key derivation */
2200 sm->xxkey_len = pmk_len;
2201 os_memcpy(sm->xxkey, pmk, pmk_len);
2202 #endif /* CONFIG_IEEE80211R */
2203 }
2204
2205
2206 /**
2207 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
2208 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2209 *
2210 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
2211 * will be cleared.
2212 */
wpa_sm_set_pmk_from_pmksa(struct wpa_sm * sm)2213 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
2214 {
2215 if (sm == NULL)
2216 return;
2217
2218 if (sm->cur_pmksa) {
2219 sm->pmk_len = sm->cur_pmksa->pmk_len;
2220 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
2221 } else {
2222 sm->pmk_len = PMK_LEN;
2223 os_memset(sm->pmk, 0, PMK_LEN);
2224 }
2225 }
2226
2227
2228 /**
2229 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
2230 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2231 * @fast_reauth: Whether fast reauthentication (EAP) is allowed
2232 */
wpa_sm_set_fast_reauth(struct wpa_sm * sm,int fast_reauth)2233 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
2234 {
2235 if (sm)
2236 sm->fast_reauth = fast_reauth;
2237 }
2238
2239
2240 /**
2241 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
2242 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2243 * @scard_ctx: Context pointer for smartcard related callback functions
2244 */
wpa_sm_set_scard_ctx(struct wpa_sm * sm,void * scard_ctx)2245 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
2246 {
2247 if (sm == NULL)
2248 return;
2249 sm->scard_ctx = scard_ctx;
2250 if (sm->preauth_eapol)
2251 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
2252 }
2253
2254
2255 /**
2256 * wpa_sm_set_config - Notification of current configration change
2257 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2258 * @config: Pointer to current network configuration
2259 *
2260 * Notify WPA state machine that configuration has changed. config will be
2261 * stored as a backpointer to network configuration. This can be %NULL to clear
2262 * the stored pointed.
2263 */
wpa_sm_set_config(struct wpa_sm * sm,struct rsn_supp_config * config)2264 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
2265 {
2266 if (!sm)
2267 return;
2268
2269 if (config) {
2270 sm->network_ctx = config->network_ctx;
2271 sm->peerkey_enabled = config->peerkey_enabled;
2272 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2273 sm->proactive_key_caching = config->proactive_key_caching;
2274 sm->eap_workaround = config->eap_workaround;
2275 sm->eap_conf_ctx = config->eap_conf_ctx;
2276 if (config->ssid) {
2277 os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2278 sm->ssid_len = config->ssid_len;
2279 } else
2280 sm->ssid_len = 0;
2281 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
2282 sm->p2p = config->p2p;
2283 } else {
2284 sm->network_ctx = NULL;
2285 sm->peerkey_enabled = 0;
2286 sm->allowed_pairwise_cipher = 0;
2287 sm->proactive_key_caching = 0;
2288 sm->eap_workaround = 0;
2289 sm->eap_conf_ctx = NULL;
2290 sm->ssid_len = 0;
2291 sm->wpa_ptk_rekey = 0;
2292 sm->p2p = 0;
2293 }
2294 }
2295
2296
2297 /**
2298 * wpa_sm_set_own_addr - Set own MAC address
2299 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2300 * @addr: Own MAC address
2301 */
wpa_sm_set_own_addr(struct wpa_sm * sm,const u8 * addr)2302 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2303 {
2304 if (sm)
2305 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2306 }
2307
2308
2309 /**
2310 * wpa_sm_set_ifname - Set network interface name
2311 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2312 * @ifname: Interface name
2313 * @bridge_ifname: Optional bridge interface name (for pre-auth)
2314 */
wpa_sm_set_ifname(struct wpa_sm * sm,const char * ifname,const char * bridge_ifname)2315 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2316 const char *bridge_ifname)
2317 {
2318 if (sm) {
2319 sm->ifname = ifname;
2320 sm->bridge_ifname = bridge_ifname;
2321 }
2322 }
2323
2324
2325 /**
2326 * wpa_sm_set_eapol - Set EAPOL state machine pointer
2327 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2328 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2329 */
wpa_sm_set_eapol(struct wpa_sm * sm,struct eapol_sm * eapol)2330 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2331 {
2332 if (sm)
2333 sm->eapol = eapol;
2334 }
2335
2336
2337 /**
2338 * wpa_sm_set_param - Set WPA state machine parameters
2339 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2340 * @param: Parameter field
2341 * @value: Parameter value
2342 * Returns: 0 on success, -1 on failure
2343 */
wpa_sm_set_param(struct wpa_sm * sm,enum wpa_sm_conf_params param,unsigned int value)2344 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2345 unsigned int value)
2346 {
2347 int ret = 0;
2348
2349 if (sm == NULL)
2350 return -1;
2351
2352 switch (param) {
2353 case RSNA_PMK_LIFETIME:
2354 if (value > 0)
2355 sm->dot11RSNAConfigPMKLifetime = value;
2356 else
2357 ret = -1;
2358 break;
2359 case RSNA_PMK_REAUTH_THRESHOLD:
2360 if (value > 0 && value <= 100)
2361 sm->dot11RSNAConfigPMKReauthThreshold = value;
2362 else
2363 ret = -1;
2364 break;
2365 case RSNA_SA_TIMEOUT:
2366 if (value > 0)
2367 sm->dot11RSNAConfigSATimeout = value;
2368 else
2369 ret = -1;
2370 break;
2371 case WPA_PARAM_PROTO:
2372 sm->proto = value;
2373 break;
2374 case WPA_PARAM_PAIRWISE:
2375 sm->pairwise_cipher = value;
2376 break;
2377 case WPA_PARAM_GROUP:
2378 sm->group_cipher = value;
2379 break;
2380 case WPA_PARAM_KEY_MGMT:
2381 sm->key_mgmt = value;
2382 break;
2383 #ifdef CONFIG_IEEE80211W
2384 case WPA_PARAM_MGMT_GROUP:
2385 sm->mgmt_group_cipher = value;
2386 break;
2387 #endif /* CONFIG_IEEE80211W */
2388 case WPA_PARAM_RSN_ENABLED:
2389 sm->rsn_enabled = value;
2390 break;
2391 case WPA_PARAM_MFP:
2392 sm->mfp = value;
2393 break;
2394 default:
2395 break;
2396 }
2397
2398 return ret;
2399 }
2400
2401
2402 /**
2403 * wpa_sm_get_status - Get WPA state machine
2404 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2405 * @buf: Buffer for status information
2406 * @buflen: Maximum buffer length
2407 * @verbose: Whether to include verbose status information
2408 * Returns: Number of bytes written to buf.
2409 *
2410 * Query WPA state machine for status information. This function fills in
2411 * a text area with current status information. If the buffer (buf) is not
2412 * large enough, status information will be truncated to fit the buffer.
2413 */
wpa_sm_get_status(struct wpa_sm * sm,char * buf,size_t buflen,int verbose)2414 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2415 int verbose)
2416 {
2417 char *pos = buf, *end = buf + buflen;
2418 int ret;
2419
2420 ret = os_snprintf(pos, end - pos,
2421 "pairwise_cipher=%s\n"
2422 "group_cipher=%s\n"
2423 "key_mgmt=%s\n",
2424 wpa_cipher_txt(sm->pairwise_cipher),
2425 wpa_cipher_txt(sm->group_cipher),
2426 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2427 if (ret < 0 || ret >= end - pos)
2428 return pos - buf;
2429 pos += ret;
2430
2431 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) {
2432 struct wpa_ie_data rsn;
2433 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn)
2434 >= 0 &&
2435 rsn.capabilities & (WPA_CAPABILITY_MFPR |
2436 WPA_CAPABILITY_MFPC)) {
2437 ret = os_snprintf(pos, end - pos, "pmf=%d\n",
2438 (rsn.capabilities &
2439 WPA_CAPABILITY_MFPR) ? 2 : 1);
2440 if (ret < 0 || ret >= end - pos)
2441 return pos - buf;
2442 pos += ret;
2443 }
2444 }
2445
2446 return pos - buf;
2447 }
2448
2449
wpa_sm_pmf_enabled(struct wpa_sm * sm)2450 int wpa_sm_pmf_enabled(struct wpa_sm *sm)
2451 {
2452 struct wpa_ie_data rsn;
2453
2454 if (sm->mfp == NO_MGMT_FRAME_PROTECTION || !sm->ap_rsn_ie)
2455 return 0;
2456
2457 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) >= 0 &&
2458 rsn.capabilities & (WPA_CAPABILITY_MFPR | WPA_CAPABILITY_MFPC))
2459 return 1;
2460
2461 return 0;
2462 }
2463
2464
2465 /**
2466 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2467 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2468 * @wpa_ie: Pointer to buffer for WPA/RSN IE
2469 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2470 * Returns: 0 on success, -1 on failure
2471 */
wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm * sm,u8 * wpa_ie,size_t * wpa_ie_len)2472 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2473 size_t *wpa_ie_len)
2474 {
2475 int res;
2476
2477 if (sm == NULL)
2478 return -1;
2479
2480 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2481 if (res < 0)
2482 return -1;
2483 *wpa_ie_len = res;
2484
2485 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2486 wpa_ie, *wpa_ie_len);
2487
2488 if (sm->assoc_wpa_ie == NULL) {
2489 /*
2490 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2491 * the correct version of the IE even if PMKSA caching is
2492 * aborted (which would remove PMKID from IE generation).
2493 */
2494 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2495 if (sm->assoc_wpa_ie == NULL)
2496 return -1;
2497
2498 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2499 sm->assoc_wpa_ie_len = *wpa_ie_len;
2500 }
2501
2502 return 0;
2503 }
2504
2505
2506 /**
2507 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2508 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2509 * @ie: Pointer to IE data (starting from id)
2510 * @len: IE length
2511 * Returns: 0 on success, -1 on failure
2512 *
2513 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2514 * Request frame. The IE will be used to override the default value generated
2515 * with wpa_sm_set_assoc_wpa_ie_default().
2516 */
wpa_sm_set_assoc_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2517 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2518 {
2519 if (sm == NULL)
2520 return -1;
2521
2522 os_free(sm->assoc_wpa_ie);
2523 if (ie == NULL || len == 0) {
2524 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2525 "WPA: clearing own WPA/RSN IE");
2526 sm->assoc_wpa_ie = NULL;
2527 sm->assoc_wpa_ie_len = 0;
2528 } else {
2529 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2530 sm->assoc_wpa_ie = os_malloc(len);
2531 if (sm->assoc_wpa_ie == NULL)
2532 return -1;
2533
2534 os_memcpy(sm->assoc_wpa_ie, ie, len);
2535 sm->assoc_wpa_ie_len = len;
2536 }
2537
2538 return 0;
2539 }
2540
2541
2542 /**
2543 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2544 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2545 * @ie: Pointer to IE data (starting from id)
2546 * @len: IE length
2547 * Returns: 0 on success, -1 on failure
2548 *
2549 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2550 * frame.
2551 */
wpa_sm_set_ap_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2552 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2553 {
2554 if (sm == NULL)
2555 return -1;
2556
2557 os_free(sm->ap_wpa_ie);
2558 if (ie == NULL || len == 0) {
2559 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2560 "WPA: clearing AP WPA IE");
2561 sm->ap_wpa_ie = NULL;
2562 sm->ap_wpa_ie_len = 0;
2563 } else {
2564 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2565 sm->ap_wpa_ie = os_malloc(len);
2566 if (sm->ap_wpa_ie == NULL)
2567 return -1;
2568
2569 os_memcpy(sm->ap_wpa_ie, ie, len);
2570 sm->ap_wpa_ie_len = len;
2571 }
2572
2573 return 0;
2574 }
2575
2576
2577 /**
2578 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
2579 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2580 * @ie: Pointer to IE data (starting from id)
2581 * @len: IE length
2582 * Returns: 0 on success, -1 on failure
2583 *
2584 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response
2585 * frame.
2586 */
wpa_sm_set_ap_rsn_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2587 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2588 {
2589 if (sm == NULL)
2590 return -1;
2591
2592 os_free(sm->ap_rsn_ie);
2593 if (ie == NULL || len == 0) {
2594 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2595 "WPA: clearing AP RSN IE");
2596 sm->ap_rsn_ie = NULL;
2597 sm->ap_rsn_ie_len = 0;
2598 } else {
2599 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2600 sm->ap_rsn_ie = os_malloc(len);
2601 if (sm->ap_rsn_ie == NULL)
2602 return -1;
2603
2604 os_memcpy(sm->ap_rsn_ie, ie, len);
2605 sm->ap_rsn_ie_len = len;
2606 }
2607
2608 return 0;
2609 }
2610
2611
2612 /**
2613 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
2614 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2615 * @data: Pointer to data area for parsing results
2616 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
2617 *
2618 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
2619 * parsed data into data.
2620 */
wpa_sm_parse_own_wpa_ie(struct wpa_sm * sm,struct wpa_ie_data * data)2621 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
2622 {
2623 if (sm == NULL)
2624 return -1;
2625
2626 if (sm->assoc_wpa_ie == NULL) {
2627 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2628 "WPA: No WPA/RSN IE available from association info");
2629 return -1;
2630 }
2631 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
2632 return -2;
2633 return 0;
2634 }
2635
2636
wpa_sm_pmksa_cache_list(struct wpa_sm * sm,char * buf,size_t len)2637 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len)
2638 {
2639 return pmksa_cache_list(sm->pmksa, buf, len);
2640 }
2641
2642
2643 #ifdef CONFIG_TESTING_OPTIONS
wpa_sm_drop_sa(struct wpa_sm * sm)2644 void wpa_sm_drop_sa(struct wpa_sm *sm)
2645 {
2646 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK");
2647 sm->ptk_set = 0;
2648 sm->tptk_set = 0;
2649 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2650 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
2651 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
2652 }
2653 #endif /* CONFIG_TESTING_OPTIONS */
2654
2655
wpa_sm_has_ptk(struct wpa_sm * sm)2656 int wpa_sm_has_ptk(struct wpa_sm *sm)
2657 {
2658 if (sm == NULL)
2659 return 0;
2660 return sm->ptk_set;
2661 }
2662
2663
wpa_sm_update_replay_ctr(struct wpa_sm * sm,const u8 * replay_ctr)2664 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr)
2665 {
2666 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN);
2667 }
2668
2669
wpa_sm_pmksa_cache_flush(struct wpa_sm * sm,void * network_ctx)2670 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx)
2671 {
2672 pmksa_cache_flush(sm->pmksa, network_ctx, NULL, 0);
2673 }
2674
2675
2676 #ifdef CONFIG_WNM
wpa_wnmsleep_install_key(struct wpa_sm * sm,u8 subelem_id,u8 * buf)2677 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf)
2678 {
2679 u16 keyinfo;
2680 u8 keylen; /* plaintext key len */
2681 u8 *key_rsc;
2682
2683 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) {
2684 struct wpa_gtk_data gd;
2685
2686 os_memset(&gd, 0, sizeof(gd));
2687 keylen = wpa_cipher_key_len(sm->group_cipher);
2688 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
2689 gd.alg = wpa_cipher_to_alg(sm->group_cipher);
2690 if (gd.alg == WPA_ALG_NONE) {
2691 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite");
2692 return -1;
2693 }
2694
2695 key_rsc = buf + 5;
2696 keyinfo = WPA_GET_LE16(buf + 2);
2697 gd.gtk_len = keylen;
2698 if (gd.gtk_len != buf[4]) {
2699 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d",
2700 gd.gtk_len, buf[4]);
2701 return -1;
2702 }
2703 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */
2704 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(
2705 sm, !!(keyinfo & WPA_KEY_INFO_TXRX));
2706
2707 os_memcpy(gd.gtk, buf + 13, gd.gtk_len);
2708
2709 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)",
2710 gd.gtk, gd.gtk_len);
2711 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) {
2712 os_memset(&gd, 0, sizeof(gd));
2713 wpa_printf(MSG_DEBUG, "Failed to install the GTK in "
2714 "WNM mode");
2715 return -1;
2716 }
2717 os_memset(&gd, 0, sizeof(gd));
2718 #ifdef CONFIG_IEEE80211W
2719 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) {
2720 struct wpa_igtk_kde igd;
2721 u16 keyidx;
2722
2723 os_memset(&igd, 0, sizeof(igd));
2724 keylen = wpa_cipher_key_len(sm->mgmt_group_cipher);
2725 os_memcpy(igd.keyid, buf + 2, 2);
2726 os_memcpy(igd.pn, buf + 4, 6);
2727
2728 keyidx = WPA_GET_LE16(igd.keyid);
2729 os_memcpy(igd.igtk, buf + 10, keylen);
2730
2731 wpa_hexdump_key(MSG_DEBUG, "Install IGTK (WNM SLEEP)",
2732 igd.igtk, keylen);
2733 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
2734 broadcast_ether_addr,
2735 keyidx, 0, igd.pn, sizeof(igd.pn),
2736 igd.igtk, keylen) < 0) {
2737 wpa_printf(MSG_DEBUG, "Failed to install the IGTK in "
2738 "WNM mode");
2739 os_memset(&igd, 0, sizeof(igd));
2740 return -1;
2741 }
2742 os_memset(&igd, 0, sizeof(igd));
2743 #endif /* CONFIG_IEEE80211W */
2744 } else {
2745 wpa_printf(MSG_DEBUG, "Unknown element id");
2746 return -1;
2747 }
2748
2749 return 0;
2750 }
2751 #endif /* CONFIG_WNM */
2752
2753
2754 #ifdef CONFIG_PEERKEY
wpa_sm_rx_eapol_peerkey(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2755 int wpa_sm_rx_eapol_peerkey(struct wpa_sm *sm, const u8 *src_addr,
2756 const u8 *buf, size_t len)
2757 {
2758 struct wpa_peerkey *peerkey;
2759
2760 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
2761 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
2762 break;
2763 }
2764
2765 if (!peerkey)
2766 return 0;
2767
2768 wpa_sm_rx_eapol(sm, src_addr, buf, len);
2769
2770 return 1;
2771 }
2772 #endif /* CONFIG_PEERKEY */
2773
2774
2775 #ifdef CONFIG_P2P
2776
wpa_sm_get_p2p_ip_addr(struct wpa_sm * sm,u8 * buf)2777 int wpa_sm_get_p2p_ip_addr(struct wpa_sm *sm, u8 *buf)
2778 {
2779 if (sm == NULL || WPA_GET_BE32(sm->p2p_ip_addr) == 0)
2780 return -1;
2781 os_memcpy(buf, sm->p2p_ip_addr, 3 * 4);
2782 return 0;
2783 }
2784
2785 #endif /* CONFIG_P2P */
2786