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, maxkeylen / 8, key_data, gd->gtk)) {
1299 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1300 "WPA: AES unwrap failed - could not decrypt "
1301 "GTK");
1302 return -1;
1303 }
1304 } else {
1305 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1306 "WPA: Unsupported key_info type %d", ver);
1307 return -1;
1308 }
1309 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1310 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1311 return 0;
1312 }
1313
1314
wpa_supplicant_send_2_of_2(struct wpa_sm * sm,const struct wpa_eapol_key * key,int ver,u16 key_info)1315 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1316 const struct wpa_eapol_key *key,
1317 int ver, u16 key_info)
1318 {
1319 size_t rlen;
1320 struct wpa_eapol_key *reply;
1321 u8 *rbuf;
1322
1323 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1324 sizeof(*reply), &rlen, (void *) &reply);
1325 if (rbuf == NULL)
1326 return -1;
1327
1328 reply->type = (sm->proto == WPA_PROTO_RSN ||
1329 sm->proto == WPA_PROTO_OSEN) ?
1330 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1331 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1332 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
1333 WPA_PUT_BE16(reply->key_info, key_info);
1334 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
1335 WPA_PUT_BE16(reply->key_length, 0);
1336 else
1337 os_memcpy(reply->key_length, key->key_length, 2);
1338 os_memcpy(reply->replay_counter, key->replay_counter,
1339 WPA_REPLAY_COUNTER_LEN);
1340
1341 WPA_PUT_BE16(reply->key_data_length, 0);
1342
1343 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1344 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL,
1345 rbuf, rlen, reply->key_mic);
1346
1347 return 0;
1348 }
1349
1350
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)1351 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1352 const unsigned char *src_addr,
1353 const struct wpa_eapol_key *key,
1354 const u8 *key_data,
1355 size_t key_data_len, u16 ver)
1356 {
1357 u16 key_info;
1358 int rekey, ret;
1359 struct wpa_gtk_data gd;
1360
1361 os_memset(&gd, 0, sizeof(gd));
1362
1363 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1364 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key "
1365 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1366
1367 key_info = WPA_GET_BE16(key->key_info);
1368
1369 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
1370 ret = wpa_supplicant_process_1_of_2_rsn(sm, key_data,
1371 key_data_len, key_info,
1372 &gd);
1373 } else {
1374 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, key_data,
1375 key_data_len,
1376 key_info, ver, &gd);
1377 }
1378
1379 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1380
1381 if (ret)
1382 goto failed;
1383
1384 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) ||
1385 wpa_supplicant_send_2_of_2(sm, key, ver, key_info))
1386 goto failed;
1387
1388 if (rekey) {
1389 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying "
1390 "completed with " MACSTR " [GTK=%s]",
1391 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1392 wpa_sm_cancel_auth_timeout(sm);
1393 wpa_sm_set_state(sm, WPA_COMPLETED);
1394 } else {
1395 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1396 key_info &
1397 WPA_KEY_INFO_SECURE);
1398 }
1399
1400 wpa_sm_set_rekey_offload(sm);
1401
1402 return;
1403
1404 failed:
1405 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1406 }
1407
1408
wpa_supplicant_verify_eapol_key_mic(struct wpa_sm * sm,struct wpa_eapol_key * key,u16 ver,const u8 * buf,size_t len)1409 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1410 struct wpa_eapol_key *key,
1411 u16 ver,
1412 const u8 *buf, size_t len)
1413 {
1414 u8 mic[16];
1415 int ok = 0;
1416
1417 os_memcpy(mic, key->key_mic, 16);
1418 if (sm->tptk_set) {
1419 os_memset(key->key_mic, 0, 16);
1420 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len,
1421 key->key_mic);
1422 if (os_memcmp_const(mic, key->key_mic, 16) != 0) {
1423 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1424 "WPA: Invalid EAPOL-Key MIC "
1425 "when using TPTK - ignoring TPTK");
1426 } else {
1427 ok = 1;
1428 sm->tptk_set = 0;
1429 sm->ptk_set = 1;
1430 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1431 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
1432 }
1433 }
1434
1435 if (!ok && sm->ptk_set) {
1436 os_memset(key->key_mic, 0, 16);
1437 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len,
1438 key->key_mic);
1439 if (os_memcmp_const(mic, key->key_mic, 16) != 0) {
1440 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1441 "WPA: Invalid EAPOL-Key MIC - "
1442 "dropping packet");
1443 return -1;
1444 }
1445 ok = 1;
1446 }
1447
1448 if (!ok) {
1449 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1450 "WPA: Could not verify EAPOL-Key MIC - "
1451 "dropping packet");
1452 return -1;
1453 }
1454
1455 os_memcpy(sm->rx_replay_counter, key->replay_counter,
1456 WPA_REPLAY_COUNTER_LEN);
1457 sm->rx_replay_counter_set = 1;
1458 return 0;
1459 }
1460
1461
1462 /* 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)1463 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1464 struct wpa_eapol_key *key, u16 ver,
1465 u8 *key_data, size_t *key_data_len)
1466 {
1467 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1468 key_data, *key_data_len);
1469 if (!sm->ptk_set) {
1470 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1471 "WPA: PTK not available, cannot decrypt EAPOL-Key Key "
1472 "Data");
1473 return -1;
1474 }
1475
1476 /* Decrypt key data here so that this operation does not need
1477 * to be implemented separately for each message type. */
1478 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1479 u8 ek[32];
1480 os_memcpy(ek, key->key_iv, 16);
1481 os_memcpy(ek + 16, sm->ptk.kek, 16);
1482 if (rc4_skip(ek, 32, 256, key_data, *key_data_len)) {
1483 os_memset(ek, 0, sizeof(ek));
1484 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1485 "WPA: RC4 failed");
1486 return -1;
1487 }
1488 os_memset(ek, 0, sizeof(ek));
1489 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1490 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC ||
1491 sm->key_mgmt == WPA_KEY_MGMT_OSEN) {
1492 u8 *buf;
1493 if (*key_data_len < 8 || *key_data_len % 8) {
1494 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1495 "WPA: Unsupported AES-WRAP len %u",
1496 (unsigned int) *key_data_len);
1497 return -1;
1498 }
1499 *key_data_len -= 8; /* AES-WRAP adds 8 bytes */
1500 buf = os_malloc(*key_data_len);
1501 if (buf == NULL) {
1502 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1503 "WPA: No memory for AES-UNWRAP buffer");
1504 return -1;
1505 }
1506 if (aes_unwrap(sm->ptk.kek, *key_data_len / 8,
1507 key_data, buf)) {
1508 os_free(buf);
1509 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1510 "WPA: AES unwrap failed - "
1511 "could not decrypt EAPOL-Key key data");
1512 return -1;
1513 }
1514 os_memcpy(key_data, buf, *key_data_len);
1515 os_free(buf);
1516 WPA_PUT_BE16(key->key_data_length, *key_data_len);
1517 } else {
1518 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1519 "WPA: Unsupported key_info type %d", ver);
1520 return -1;
1521 }
1522 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1523 key_data, *key_data_len);
1524 return 0;
1525 }
1526
1527
1528 /**
1529 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1530 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1531 */
wpa_sm_aborted_cached(struct wpa_sm * sm)1532 void wpa_sm_aborted_cached(struct wpa_sm *sm)
1533 {
1534 if (sm && sm->cur_pmksa) {
1535 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1536 "RSN: Cancelling PMKSA caching attempt");
1537 sm->cur_pmksa = NULL;
1538 }
1539 }
1540
1541
wpa_eapol_key_dump(struct wpa_sm * sm,const struct wpa_eapol_key * key)1542 static void wpa_eapol_key_dump(struct wpa_sm *sm,
1543 const struct wpa_eapol_key *key)
1544 {
1545 #ifndef CONFIG_NO_STDOUT_DEBUG
1546 u16 key_info = WPA_GET_BE16(key->key_info);
1547
1548 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type);
1549 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1550 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)",
1551 key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1552 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1553 WPA_KEY_INFO_KEY_INDEX_SHIFT,
1554 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1555 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1556 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1557 key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1558 key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1559 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1560 key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1561 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1562 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1563 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1564 " key_length=%u key_data_length=%u",
1565 WPA_GET_BE16(key->key_length),
1566 WPA_GET_BE16(key->key_data_length));
1567 wpa_hexdump(MSG_DEBUG, " replay_counter",
1568 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1569 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN);
1570 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16);
1571 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8);
1572 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8);
1573 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16);
1574 #endif /* CONFIG_NO_STDOUT_DEBUG */
1575 }
1576
1577
1578 /**
1579 * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1580 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1581 * @src_addr: Source MAC address of the EAPOL packet
1582 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1583 * @len: Length of the EAPOL frame
1584 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1585 *
1586 * This function is called for each received EAPOL frame. Other than EAPOL-Key
1587 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1588 * only processing WPA and WPA2 EAPOL-Key frames.
1589 *
1590 * The received EAPOL-Key packets are validated and valid packets are replied
1591 * to. In addition, key material (PTK, GTK) is configured at the end of a
1592 * successful key handshake.
1593 */
wpa_sm_rx_eapol(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1594 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1595 const u8 *buf, size_t len)
1596 {
1597 size_t plen, data_len, key_data_len;
1598 const struct ieee802_1x_hdr *hdr;
1599 struct wpa_eapol_key *key;
1600 u16 key_info, ver;
1601 u8 *tmp = NULL;
1602 int ret = -1;
1603 struct wpa_peerkey *peerkey = NULL;
1604 u8 *key_data;
1605
1606 #ifdef CONFIG_IEEE80211R
1607 sm->ft_completed = 0;
1608 #endif /* CONFIG_IEEE80211R */
1609
1610 if (len < sizeof(*hdr) + sizeof(*key)) {
1611 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1612 "WPA: EAPOL frame too short to be a WPA "
1613 "EAPOL-Key (len %lu, expecting at least %lu)",
1614 (unsigned long) len,
1615 (unsigned long) sizeof(*hdr) + sizeof(*key));
1616 return 0;
1617 }
1618
1619 hdr = (const struct ieee802_1x_hdr *) buf;
1620 plen = be_to_host16(hdr->length);
1621 data_len = plen + sizeof(*hdr);
1622 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1623 "IEEE 802.1X RX: version=%d type=%d length=%lu",
1624 hdr->version, hdr->type, (unsigned long) plen);
1625
1626 if (hdr->version < EAPOL_VERSION) {
1627 /* TODO: backwards compatibility */
1628 }
1629 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1630 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1631 "WPA: EAPOL frame (type %u) discarded, "
1632 "not a Key frame", hdr->type);
1633 ret = 0;
1634 goto out;
1635 }
1636 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", buf, len);
1637 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
1638 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1639 "WPA: EAPOL frame payload size %lu "
1640 "invalid (frame size %lu)",
1641 (unsigned long) plen, (unsigned long) len);
1642 ret = 0;
1643 goto out;
1644 }
1645 if (data_len < len) {
1646 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1647 "WPA: ignoring %lu bytes after the IEEE 802.1X data",
1648 (unsigned long) len - data_len);
1649 }
1650
1651 /*
1652 * Make a copy of the frame since we need to modify the buffer during
1653 * MAC validation and Key Data decryption.
1654 */
1655 tmp = os_malloc(data_len);
1656 if (tmp == NULL)
1657 goto out;
1658 os_memcpy(tmp, buf, data_len);
1659 key = (struct wpa_eapol_key *) (tmp + sizeof(struct ieee802_1x_hdr));
1660 key_data = (u8 *) (key + 1);
1661
1662 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1663 {
1664 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1665 "WPA: EAPOL-Key type (%d) unknown, discarded",
1666 key->type);
1667 ret = 0;
1668 goto out;
1669 }
1670 wpa_eapol_key_dump(sm, key);
1671
1672 key_data_len = WPA_GET_BE16(key->key_data_length);
1673 if (key_data_len > plen - sizeof(struct wpa_eapol_key)) {
1674 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1675 "frame - key_data overflow (%u > %u)",
1676 (unsigned int) key_data_len,
1677 (unsigned int) (plen - sizeof(struct wpa_eapol_key)));
1678 goto out;
1679 }
1680
1681 eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1682 key_info = WPA_GET_BE16(key->key_info);
1683 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1684 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1685 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
1686 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1687 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
1688 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
1689 sm->key_mgmt != WPA_KEY_MGMT_OSEN) {
1690 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1691 "WPA: Unsupported EAPOL-Key descriptor version %d",
1692 ver);
1693 goto out;
1694 }
1695
1696 if (sm->key_mgmt == WPA_KEY_MGMT_OSEN &&
1697 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1698 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1699 "OSEN: Unsupported EAPOL-Key descriptor version %d",
1700 ver);
1701 goto out;
1702 }
1703
1704 #ifdef CONFIG_IEEE80211R
1705 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
1706 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
1707 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1708 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1709 "FT: AP did not use AES-128-CMAC");
1710 goto out;
1711 }
1712 } else
1713 #endif /* CONFIG_IEEE80211R */
1714 #ifdef CONFIG_IEEE80211W
1715 if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
1716 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1717 sm->key_mgmt != WPA_KEY_MGMT_OSEN) {
1718 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1719 "WPA: AP did not use the "
1720 "negotiated AES-128-CMAC");
1721 goto out;
1722 }
1723 } else
1724 #endif /* CONFIG_IEEE80211W */
1725 if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
1726 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1727 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1728 "WPA: CCMP is used, but EAPOL-Key "
1729 "descriptor version (%d) is not 2", ver);
1730 if (sm->group_cipher != WPA_CIPHER_CCMP &&
1731 !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1732 /* Earlier versions of IEEE 802.11i did not explicitly
1733 * require version 2 descriptor for all EAPOL-Key
1734 * packets, so allow group keys to use version 1 if
1735 * CCMP is not used for them. */
1736 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1737 "WPA: Backwards compatibility: allow invalid "
1738 "version for non-CCMP group keys");
1739 } else if (ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1740 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1741 "WPA: Interoperability workaround: allow incorrect (should have been HMAC-SHA1), but stronger (is AES-128-CMAC), descriptor version to be used");
1742 } else
1743 goto out;
1744 } else if (sm->pairwise_cipher == WPA_CIPHER_GCMP &&
1745 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1746 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1747 "WPA: GCMP is used, but EAPOL-Key "
1748 "descriptor version (%d) is not 2", ver);
1749 goto out;
1750 }
1751
1752 #ifdef CONFIG_PEERKEY
1753 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
1754 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
1755 break;
1756 }
1757
1758 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
1759 if (!peerkey->initiator && peerkey->replay_counter_set &&
1760 os_memcmp(key->replay_counter, peerkey->replay_counter,
1761 WPA_REPLAY_COUNTER_LEN) <= 0) {
1762 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1763 "RSN: EAPOL-Key Replay Counter did not "
1764 "increase (STK) - dropping packet");
1765 goto out;
1766 } else if (peerkey->initiator) {
1767 u8 _tmp[WPA_REPLAY_COUNTER_LEN];
1768 os_memcpy(_tmp, key->replay_counter,
1769 WPA_REPLAY_COUNTER_LEN);
1770 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
1771 if (os_memcmp(_tmp, peerkey->replay_counter,
1772 WPA_REPLAY_COUNTER_LEN) != 0) {
1773 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1774 "RSN: EAPOL-Key Replay "
1775 "Counter did not match (STK) - "
1776 "dropping packet");
1777 goto out;
1778 }
1779 }
1780 }
1781
1782 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
1783 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1784 "RSN: Ack bit in key_info from STK peer");
1785 goto out;
1786 }
1787 #endif /* CONFIG_PEERKEY */
1788
1789 if (!peerkey && sm->rx_replay_counter_set &&
1790 os_memcmp(key->replay_counter, sm->rx_replay_counter,
1791 WPA_REPLAY_COUNTER_LEN) <= 0) {
1792 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1793 "WPA: EAPOL-Key Replay Counter did not increase - "
1794 "dropping packet");
1795 goto out;
1796 }
1797
1798 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
1799 #ifdef CONFIG_PEERKEY
1800 && (peerkey == NULL || !peerkey->initiator)
1801 #endif /* CONFIG_PEERKEY */
1802 ) {
1803 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1804 "WPA: No Ack bit in key_info");
1805 goto out;
1806 }
1807
1808 if (key_info & WPA_KEY_INFO_REQUEST) {
1809 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1810 "WPA: EAPOL-Key with Request bit - dropped");
1811 goto out;
1812 }
1813
1814 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
1815 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
1816 goto out;
1817
1818 #ifdef CONFIG_PEERKEY
1819 if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
1820 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len))
1821 goto out;
1822 #endif /* CONFIG_PEERKEY */
1823
1824 if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) &&
1825 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1826 if (wpa_supplicant_decrypt_key_data(sm, key, ver, key_data,
1827 &key_data_len))
1828 goto out;
1829 }
1830
1831 if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1832 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
1833 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1834 "WPA: Ignored EAPOL-Key (Pairwise) with "
1835 "non-zero key index");
1836 goto out;
1837 }
1838 if (peerkey) {
1839 /* PeerKey 4-Way Handshake */
1840 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver,
1841 key_data, key_data_len);
1842 } else if (key_info & WPA_KEY_INFO_MIC) {
1843 /* 3/4 4-Way Handshake */
1844 wpa_supplicant_process_3_of_4(sm, key, ver, key_data,
1845 key_data_len);
1846 } else {
1847 /* 1/4 4-Way Handshake */
1848 wpa_supplicant_process_1_of_4(sm, src_addr, key,
1849 ver, key_data,
1850 key_data_len);
1851 }
1852 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1853 /* PeerKey SMK Handshake */
1854 peerkey_rx_eapol_smk(sm, src_addr, key, key_data_len, key_info,
1855 ver);
1856 } else {
1857 if (key_info & WPA_KEY_INFO_MIC) {
1858 /* 1/2 Group Key Handshake */
1859 wpa_supplicant_process_1_of_2(sm, src_addr, key,
1860 key_data, key_data_len,
1861 ver);
1862 } else {
1863 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1864 "WPA: EAPOL-Key (Group) without Mic bit - "
1865 "dropped");
1866 }
1867 }
1868
1869 ret = 1;
1870
1871 out:
1872 os_free(tmp);
1873 return ret;
1874 }
1875
1876
1877 #ifdef CONFIG_CTRL_IFACE
wpa_key_mgmt_suite(struct wpa_sm * sm)1878 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
1879 {
1880 switch (sm->key_mgmt) {
1881 case WPA_KEY_MGMT_IEEE8021X:
1882 return ((sm->proto == WPA_PROTO_RSN ||
1883 sm->proto == WPA_PROTO_OSEN) ?
1884 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
1885 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
1886 case WPA_KEY_MGMT_PSK:
1887 return (sm->proto == WPA_PROTO_RSN ?
1888 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
1889 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
1890 #ifdef CONFIG_IEEE80211R
1891 case WPA_KEY_MGMT_FT_IEEE8021X:
1892 return RSN_AUTH_KEY_MGMT_FT_802_1X;
1893 case WPA_KEY_MGMT_FT_PSK:
1894 return RSN_AUTH_KEY_MGMT_FT_PSK;
1895 #endif /* CONFIG_IEEE80211R */
1896 #ifdef CONFIG_IEEE80211W
1897 case WPA_KEY_MGMT_IEEE8021X_SHA256:
1898 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
1899 case WPA_KEY_MGMT_PSK_SHA256:
1900 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
1901 #endif /* CONFIG_IEEE80211W */
1902 case WPA_KEY_MGMT_CCKM:
1903 return (sm->proto == WPA_PROTO_RSN ?
1904 RSN_AUTH_KEY_MGMT_CCKM:
1905 WPA_AUTH_KEY_MGMT_CCKM);
1906 case WPA_KEY_MGMT_WPA_NONE:
1907 return WPA_AUTH_KEY_MGMT_NONE;
1908 default:
1909 return 0;
1910 }
1911 }
1912
1913
1914 #define RSN_SUITE "%02x-%02x-%02x-%d"
1915 #define RSN_SUITE_ARG(s) \
1916 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
1917
1918 /**
1919 * wpa_sm_get_mib - Dump text list of MIB entries
1920 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1921 * @buf: Buffer for the list
1922 * @buflen: Length of the buffer
1923 * Returns: Number of bytes written to buffer
1924 *
1925 * This function is used fetch dot11 MIB variables.
1926 */
wpa_sm_get_mib(struct wpa_sm * sm,char * buf,size_t buflen)1927 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
1928 {
1929 char pmkid_txt[PMKID_LEN * 2 + 1];
1930 int rsna, ret;
1931 size_t len;
1932
1933 if (sm->cur_pmksa) {
1934 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
1935 sm->cur_pmksa->pmkid, PMKID_LEN);
1936 } else
1937 pmkid_txt[0] = '\0';
1938
1939 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
1940 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
1941 sm->proto == WPA_PROTO_RSN)
1942 rsna = 1;
1943 else
1944 rsna = 0;
1945
1946 ret = os_snprintf(buf, buflen,
1947 "dot11RSNAOptionImplemented=TRUE\n"
1948 "dot11RSNAPreauthenticationImplemented=TRUE\n"
1949 "dot11RSNAEnabled=%s\n"
1950 "dot11RSNAPreauthenticationEnabled=%s\n"
1951 "dot11RSNAConfigVersion=%d\n"
1952 "dot11RSNAConfigPairwiseKeysSupported=5\n"
1953 "dot11RSNAConfigGroupCipherSize=%d\n"
1954 "dot11RSNAConfigPMKLifetime=%d\n"
1955 "dot11RSNAConfigPMKReauthThreshold=%d\n"
1956 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
1957 "dot11RSNAConfigSATimeout=%d\n",
1958 rsna ? "TRUE" : "FALSE",
1959 rsna ? "TRUE" : "FALSE",
1960 RSN_VERSION,
1961 wpa_cipher_key_len(sm->group_cipher) * 8,
1962 sm->dot11RSNAConfigPMKLifetime,
1963 sm->dot11RSNAConfigPMKReauthThreshold,
1964 sm->dot11RSNAConfigSATimeout);
1965 if (ret < 0 || (size_t) ret >= buflen)
1966 return 0;
1967 len = ret;
1968
1969 ret = os_snprintf(
1970 buf + len, buflen - len,
1971 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
1972 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
1973 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
1974 "dot11RSNAPMKIDUsed=%s\n"
1975 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
1976 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
1977 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
1978 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
1979 "dot11RSNA4WayHandshakeFailures=%u\n",
1980 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1981 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1982 sm->pairwise_cipher)),
1983 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1984 sm->group_cipher)),
1985 pmkid_txt,
1986 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1987 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1988 sm->pairwise_cipher)),
1989 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
1990 sm->group_cipher)),
1991 sm->dot11RSNA4WayHandshakeFailures);
1992 if (ret >= 0 && (size_t) ret < buflen)
1993 len += ret;
1994
1995 return (int) len;
1996 }
1997 #endif /* CONFIG_CTRL_IFACE */
1998
1999
wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx,enum pmksa_free_reason reason)2000 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
2001 void *ctx, enum pmksa_free_reason reason)
2002 {
2003 struct wpa_sm *sm = ctx;
2004 int deauth = 0;
2005
2006 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: "
2007 MACSTR " reason=%d", MAC2STR(entry->aa), reason);
2008
2009 if (sm->cur_pmksa == entry) {
2010 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2011 "RSN: %s current PMKSA entry",
2012 reason == PMKSA_REPLACE ? "replaced" : "removed");
2013 pmksa_cache_clear_current(sm);
2014
2015 /*
2016 * If an entry is simply being replaced, there's no need to
2017 * deauthenticate because it will be immediately re-added.
2018 * This happens when EAP authentication is completed again
2019 * (reauth or failed PMKSA caching attempt).
2020 */
2021 if (reason != PMKSA_REPLACE)
2022 deauth = 1;
2023 }
2024
2025 if (reason == PMKSA_EXPIRE &&
2026 (sm->pmk_len == entry->pmk_len &&
2027 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
2028 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2029 "RSN: deauthenticating due to expired PMK");
2030 pmksa_cache_clear_current(sm);
2031 deauth = 1;
2032 }
2033
2034 if (deauth) {
2035 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2036 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
2037 }
2038 }
2039
2040
2041 /**
2042 * wpa_sm_init - Initialize WPA state machine
2043 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
2044 * Returns: Pointer to the allocated WPA state machine data
2045 *
2046 * This function is used to allocate a new WPA state machine and the returned
2047 * value is passed to all WPA state machine calls.
2048 */
wpa_sm_init(struct wpa_sm_ctx * ctx)2049 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
2050 {
2051 struct wpa_sm *sm;
2052
2053 sm = os_zalloc(sizeof(*sm));
2054 if (sm == NULL)
2055 return NULL;
2056 dl_list_init(&sm->pmksa_candidates);
2057 sm->renew_snonce = 1;
2058 sm->ctx = ctx;
2059
2060 sm->dot11RSNAConfigPMKLifetime = 43200;
2061 sm->dot11RSNAConfigPMKReauthThreshold = 70;
2062 sm->dot11RSNAConfigSATimeout = 60;
2063
2064 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
2065 if (sm->pmksa == NULL) {
2066 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
2067 "RSN: PMKSA cache initialization failed");
2068 os_free(sm);
2069 return NULL;
2070 }
2071
2072 return sm;
2073 }
2074
2075
2076 /**
2077 * wpa_sm_deinit - Deinitialize WPA state machine
2078 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2079 */
wpa_sm_deinit(struct wpa_sm * sm)2080 void wpa_sm_deinit(struct wpa_sm *sm)
2081 {
2082 if (sm == NULL)
2083 return;
2084 pmksa_cache_deinit(sm->pmksa);
2085 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
2086 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
2087 os_free(sm->assoc_wpa_ie);
2088 os_free(sm->ap_wpa_ie);
2089 os_free(sm->ap_rsn_ie);
2090 os_free(sm->ctx);
2091 peerkey_deinit(sm);
2092 #ifdef CONFIG_IEEE80211R
2093 os_free(sm->assoc_resp_ies);
2094 #endif /* CONFIG_IEEE80211R */
2095 os_free(sm);
2096 }
2097
2098
2099 /**
2100 * wpa_sm_notify_assoc - Notify WPA state machine about association
2101 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2102 * @bssid: The BSSID of the new association
2103 *
2104 * This function is called to let WPA state machine know that the connection
2105 * was established.
2106 */
wpa_sm_notify_assoc(struct wpa_sm * sm,const u8 * bssid)2107 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
2108 {
2109 int clear_ptk = 1;
2110
2111 if (sm == NULL)
2112 return;
2113
2114 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2115 "WPA: Association event - clear replay counter");
2116 os_memcpy(sm->bssid, bssid, ETH_ALEN);
2117 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
2118 sm->rx_replay_counter_set = 0;
2119 sm->renew_snonce = 1;
2120 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
2121 rsn_preauth_deinit(sm);
2122
2123 #ifdef CONFIG_IEEE80211R
2124 if (wpa_ft_is_completed(sm)) {
2125 /*
2126 * Clear portValid to kick EAPOL state machine to re-enter
2127 * AUTHENTICATED state to get the EAPOL port Authorized.
2128 */
2129 eapol_sm_notify_portValid(sm->eapol, FALSE);
2130 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
2131
2132 /* Prepare for the next transition */
2133 wpa_ft_prepare_auth_request(sm, NULL);
2134
2135 clear_ptk = 0;
2136 }
2137 #endif /* CONFIG_IEEE80211R */
2138
2139 if (clear_ptk) {
2140 /*
2141 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
2142 * this is not part of a Fast BSS Transition.
2143 */
2144 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK");
2145 sm->ptk_set = 0;
2146 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
2147 sm->tptk_set = 0;
2148 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
2149 }
2150
2151 #ifdef CONFIG_TDLS
2152 wpa_tdls_assoc(sm);
2153 #endif /* CONFIG_TDLS */
2154
2155 #ifdef CONFIG_P2P
2156 os_memset(sm->p2p_ip_addr, 0, sizeof(sm->p2p_ip_addr));
2157 #endif /* CONFIG_P2P */
2158 }
2159
2160
2161 /**
2162 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
2163 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2164 *
2165 * This function is called to let WPA state machine know that the connection
2166 * was lost. This will abort any existing pre-authentication session.
2167 */
wpa_sm_notify_disassoc(struct wpa_sm * sm)2168 void wpa_sm_notify_disassoc(struct wpa_sm *sm)
2169 {
2170 peerkey_deinit(sm);
2171 rsn_preauth_deinit(sm);
2172 pmksa_cache_clear_current(sm);
2173 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
2174 sm->dot11RSNA4WayHandshakeFailures++;
2175 #ifdef CONFIG_TDLS
2176 wpa_tdls_disassoc(sm);
2177 #endif /* CONFIG_TDLS */
2178 }
2179
2180
2181 /**
2182 * wpa_sm_set_pmk - Set PMK
2183 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2184 * @pmk: The new PMK
2185 * @pmk_len: The length of the new PMK in bytes
2186 *
2187 * Configure the PMK for WPA state machine.
2188 */
wpa_sm_set_pmk(struct wpa_sm * sm,const u8 * pmk,size_t pmk_len)2189 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len)
2190 {
2191 if (sm == NULL)
2192 return;
2193
2194 sm->pmk_len = pmk_len;
2195 os_memcpy(sm->pmk, pmk, pmk_len);
2196
2197 #ifdef CONFIG_IEEE80211R
2198 /* Set XXKey to be PSK for FT key derivation */
2199 sm->xxkey_len = pmk_len;
2200 os_memcpy(sm->xxkey, pmk, pmk_len);
2201 #endif /* CONFIG_IEEE80211R */
2202 }
2203
2204
2205 /**
2206 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
2207 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2208 *
2209 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
2210 * will be cleared.
2211 */
wpa_sm_set_pmk_from_pmksa(struct wpa_sm * sm)2212 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
2213 {
2214 if (sm == NULL)
2215 return;
2216
2217 if (sm->cur_pmksa) {
2218 sm->pmk_len = sm->cur_pmksa->pmk_len;
2219 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
2220 } else {
2221 sm->pmk_len = PMK_LEN;
2222 os_memset(sm->pmk, 0, PMK_LEN);
2223 }
2224 }
2225
2226
2227 /**
2228 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
2229 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2230 * @fast_reauth: Whether fast reauthentication (EAP) is allowed
2231 */
wpa_sm_set_fast_reauth(struct wpa_sm * sm,int fast_reauth)2232 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
2233 {
2234 if (sm)
2235 sm->fast_reauth = fast_reauth;
2236 }
2237
2238
2239 /**
2240 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
2241 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2242 * @scard_ctx: Context pointer for smartcard related callback functions
2243 */
wpa_sm_set_scard_ctx(struct wpa_sm * sm,void * scard_ctx)2244 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
2245 {
2246 if (sm == NULL)
2247 return;
2248 sm->scard_ctx = scard_ctx;
2249 if (sm->preauth_eapol)
2250 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
2251 }
2252
2253
2254 /**
2255 * wpa_sm_set_config - Notification of current configration change
2256 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2257 * @config: Pointer to current network configuration
2258 *
2259 * Notify WPA state machine that configuration has changed. config will be
2260 * stored as a backpointer to network configuration. This can be %NULL to clear
2261 * the stored pointed.
2262 */
wpa_sm_set_config(struct wpa_sm * sm,struct rsn_supp_config * config)2263 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
2264 {
2265 if (!sm)
2266 return;
2267
2268 if (config) {
2269 sm->network_ctx = config->network_ctx;
2270 sm->peerkey_enabled = config->peerkey_enabled;
2271 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2272 sm->proactive_key_caching = config->proactive_key_caching;
2273 sm->eap_workaround = config->eap_workaround;
2274 sm->eap_conf_ctx = config->eap_conf_ctx;
2275 if (config->ssid) {
2276 os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2277 sm->ssid_len = config->ssid_len;
2278 } else
2279 sm->ssid_len = 0;
2280 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
2281 sm->p2p = config->p2p;
2282 } else {
2283 sm->network_ctx = NULL;
2284 sm->peerkey_enabled = 0;
2285 sm->allowed_pairwise_cipher = 0;
2286 sm->proactive_key_caching = 0;
2287 sm->eap_workaround = 0;
2288 sm->eap_conf_ctx = NULL;
2289 sm->ssid_len = 0;
2290 sm->wpa_ptk_rekey = 0;
2291 sm->p2p = 0;
2292 }
2293 }
2294
2295
2296 /**
2297 * wpa_sm_set_own_addr - Set own MAC address
2298 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2299 * @addr: Own MAC address
2300 */
wpa_sm_set_own_addr(struct wpa_sm * sm,const u8 * addr)2301 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2302 {
2303 if (sm)
2304 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2305 }
2306
2307
2308 /**
2309 * wpa_sm_set_ifname - Set network interface name
2310 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2311 * @ifname: Interface name
2312 * @bridge_ifname: Optional bridge interface name (for pre-auth)
2313 */
wpa_sm_set_ifname(struct wpa_sm * sm,const char * ifname,const char * bridge_ifname)2314 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2315 const char *bridge_ifname)
2316 {
2317 if (sm) {
2318 sm->ifname = ifname;
2319 sm->bridge_ifname = bridge_ifname;
2320 }
2321 }
2322
2323
2324 /**
2325 * wpa_sm_set_eapol - Set EAPOL state machine pointer
2326 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2327 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2328 */
wpa_sm_set_eapol(struct wpa_sm * sm,struct eapol_sm * eapol)2329 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2330 {
2331 if (sm)
2332 sm->eapol = eapol;
2333 }
2334
2335
2336 /**
2337 * wpa_sm_set_param - Set WPA state machine parameters
2338 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2339 * @param: Parameter field
2340 * @value: Parameter value
2341 * Returns: 0 on success, -1 on failure
2342 */
wpa_sm_set_param(struct wpa_sm * sm,enum wpa_sm_conf_params param,unsigned int value)2343 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2344 unsigned int value)
2345 {
2346 int ret = 0;
2347
2348 if (sm == NULL)
2349 return -1;
2350
2351 switch (param) {
2352 case RSNA_PMK_LIFETIME:
2353 if (value > 0)
2354 sm->dot11RSNAConfigPMKLifetime = value;
2355 else
2356 ret = -1;
2357 break;
2358 case RSNA_PMK_REAUTH_THRESHOLD:
2359 if (value > 0 && value <= 100)
2360 sm->dot11RSNAConfigPMKReauthThreshold = value;
2361 else
2362 ret = -1;
2363 break;
2364 case RSNA_SA_TIMEOUT:
2365 if (value > 0)
2366 sm->dot11RSNAConfigSATimeout = value;
2367 else
2368 ret = -1;
2369 break;
2370 case WPA_PARAM_PROTO:
2371 sm->proto = value;
2372 break;
2373 case WPA_PARAM_PAIRWISE:
2374 sm->pairwise_cipher = value;
2375 break;
2376 case WPA_PARAM_GROUP:
2377 sm->group_cipher = value;
2378 break;
2379 case WPA_PARAM_KEY_MGMT:
2380 sm->key_mgmt = value;
2381 break;
2382 #ifdef CONFIG_IEEE80211W
2383 case WPA_PARAM_MGMT_GROUP:
2384 sm->mgmt_group_cipher = value;
2385 break;
2386 #endif /* CONFIG_IEEE80211W */
2387 case WPA_PARAM_RSN_ENABLED:
2388 sm->rsn_enabled = value;
2389 break;
2390 case WPA_PARAM_MFP:
2391 sm->mfp = value;
2392 break;
2393 default:
2394 break;
2395 }
2396
2397 return ret;
2398 }
2399
2400
2401 /**
2402 * wpa_sm_get_status - Get WPA state machine
2403 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2404 * @buf: Buffer for status information
2405 * @buflen: Maximum buffer length
2406 * @verbose: Whether to include verbose status information
2407 * Returns: Number of bytes written to buf.
2408 *
2409 * Query WPA state machine for status information. This function fills in
2410 * a text area with current status information. If the buffer (buf) is not
2411 * large enough, status information will be truncated to fit the buffer.
2412 */
wpa_sm_get_status(struct wpa_sm * sm,char * buf,size_t buflen,int verbose)2413 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2414 int verbose)
2415 {
2416 char *pos = buf, *end = buf + buflen;
2417 int ret;
2418
2419 ret = os_snprintf(pos, end - pos,
2420 "pairwise_cipher=%s\n"
2421 "group_cipher=%s\n"
2422 "key_mgmt=%s\n",
2423 wpa_cipher_txt(sm->pairwise_cipher),
2424 wpa_cipher_txt(sm->group_cipher),
2425 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2426 if (ret < 0 || ret >= end - pos)
2427 return pos - buf;
2428 pos += ret;
2429
2430 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) {
2431 struct wpa_ie_data rsn;
2432 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn)
2433 >= 0 &&
2434 rsn.capabilities & (WPA_CAPABILITY_MFPR |
2435 WPA_CAPABILITY_MFPC)) {
2436 ret = os_snprintf(pos, end - pos, "pmf=%d\n",
2437 (rsn.capabilities &
2438 WPA_CAPABILITY_MFPR) ? 2 : 1);
2439 if (ret < 0 || ret >= end - pos)
2440 return pos - buf;
2441 pos += ret;
2442 }
2443 }
2444
2445 return pos - buf;
2446 }
2447
2448
wpa_sm_pmf_enabled(struct wpa_sm * sm)2449 int wpa_sm_pmf_enabled(struct wpa_sm *sm)
2450 {
2451 struct wpa_ie_data rsn;
2452
2453 if (sm->mfp == NO_MGMT_FRAME_PROTECTION || !sm->ap_rsn_ie)
2454 return 0;
2455
2456 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) >= 0 &&
2457 rsn.capabilities & (WPA_CAPABILITY_MFPR | WPA_CAPABILITY_MFPC))
2458 return 1;
2459
2460 return 0;
2461 }
2462
2463
2464 /**
2465 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2466 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2467 * @wpa_ie: Pointer to buffer for WPA/RSN IE
2468 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2469 * Returns: 0 on success, -1 on failure
2470 */
wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm * sm,u8 * wpa_ie,size_t * wpa_ie_len)2471 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2472 size_t *wpa_ie_len)
2473 {
2474 int res;
2475
2476 if (sm == NULL)
2477 return -1;
2478
2479 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2480 if (res < 0)
2481 return -1;
2482 *wpa_ie_len = res;
2483
2484 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2485 wpa_ie, *wpa_ie_len);
2486
2487 if (sm->assoc_wpa_ie == NULL) {
2488 /*
2489 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2490 * the correct version of the IE even if PMKSA caching is
2491 * aborted (which would remove PMKID from IE generation).
2492 */
2493 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2494 if (sm->assoc_wpa_ie == NULL)
2495 return -1;
2496
2497 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2498 sm->assoc_wpa_ie_len = *wpa_ie_len;
2499 }
2500
2501 return 0;
2502 }
2503
2504
2505 /**
2506 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2507 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2508 * @ie: Pointer to IE data (starting from id)
2509 * @len: IE length
2510 * Returns: 0 on success, -1 on failure
2511 *
2512 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2513 * Request frame. The IE will be used to override the default value generated
2514 * with wpa_sm_set_assoc_wpa_ie_default().
2515 */
wpa_sm_set_assoc_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2516 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2517 {
2518 if (sm == NULL)
2519 return -1;
2520
2521 os_free(sm->assoc_wpa_ie);
2522 if (ie == NULL || len == 0) {
2523 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2524 "WPA: clearing own WPA/RSN IE");
2525 sm->assoc_wpa_ie = NULL;
2526 sm->assoc_wpa_ie_len = 0;
2527 } else {
2528 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2529 sm->assoc_wpa_ie = os_malloc(len);
2530 if (sm->assoc_wpa_ie == NULL)
2531 return -1;
2532
2533 os_memcpy(sm->assoc_wpa_ie, ie, len);
2534 sm->assoc_wpa_ie_len = len;
2535 }
2536
2537 return 0;
2538 }
2539
2540
2541 /**
2542 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2543 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2544 * @ie: Pointer to IE data (starting from id)
2545 * @len: IE length
2546 * Returns: 0 on success, -1 on failure
2547 *
2548 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2549 * frame.
2550 */
wpa_sm_set_ap_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2551 int wpa_sm_set_ap_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->ap_wpa_ie);
2557 if (ie == NULL || len == 0) {
2558 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2559 "WPA: clearing AP WPA IE");
2560 sm->ap_wpa_ie = NULL;
2561 sm->ap_wpa_ie_len = 0;
2562 } else {
2563 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2564 sm->ap_wpa_ie = os_malloc(len);
2565 if (sm->ap_wpa_ie == NULL)
2566 return -1;
2567
2568 os_memcpy(sm->ap_wpa_ie, ie, len);
2569 sm->ap_wpa_ie_len = len;
2570 }
2571
2572 return 0;
2573 }
2574
2575
2576 /**
2577 * wpa_sm_set_ap_rsn_ie - Set AP RSN 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 RSN IE used in Beacon / Probe Response
2584 * frame.
2585 */
wpa_sm_set_ap_rsn_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2586 int wpa_sm_set_ap_rsn_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_rsn_ie);
2592 if (ie == NULL || len == 0) {
2593 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2594 "WPA: clearing AP RSN IE");
2595 sm->ap_rsn_ie = NULL;
2596 sm->ap_rsn_ie_len = 0;
2597 } else {
2598 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2599 sm->ap_rsn_ie = os_malloc(len);
2600 if (sm->ap_rsn_ie == NULL)
2601 return -1;
2602
2603 os_memcpy(sm->ap_rsn_ie, ie, len);
2604 sm->ap_rsn_ie_len = len;
2605 }
2606
2607 return 0;
2608 }
2609
2610
2611 /**
2612 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
2613 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2614 * @data: Pointer to data area for parsing results
2615 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
2616 *
2617 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
2618 * parsed data into data.
2619 */
wpa_sm_parse_own_wpa_ie(struct wpa_sm * sm,struct wpa_ie_data * data)2620 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
2621 {
2622 if (sm == NULL)
2623 return -1;
2624
2625 if (sm->assoc_wpa_ie == NULL) {
2626 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2627 "WPA: No WPA/RSN IE available from association info");
2628 return -1;
2629 }
2630 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
2631 return -2;
2632 return 0;
2633 }
2634
2635
wpa_sm_pmksa_cache_list(struct wpa_sm * sm,char * buf,size_t len)2636 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len)
2637 {
2638 return pmksa_cache_list(sm->pmksa, buf, len);
2639 }
2640
2641
2642 #ifdef CONFIG_TESTING_OPTIONS
wpa_sm_drop_sa(struct wpa_sm * sm)2643 void wpa_sm_drop_sa(struct wpa_sm *sm)
2644 {
2645 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK");
2646 sm->ptk_set = 0;
2647 sm->tptk_set = 0;
2648 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2649 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
2650 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
2651 }
2652 #endif /* CONFIG_TESTING_OPTIONS */
2653
2654
wpa_sm_has_ptk(struct wpa_sm * sm)2655 int wpa_sm_has_ptk(struct wpa_sm *sm)
2656 {
2657 if (sm == NULL)
2658 return 0;
2659 return sm->ptk_set;
2660 }
2661
2662
wpa_sm_update_replay_ctr(struct wpa_sm * sm,const u8 * replay_ctr)2663 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr)
2664 {
2665 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN);
2666 }
2667
2668
wpa_sm_pmksa_cache_flush(struct wpa_sm * sm,void * network_ctx)2669 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx)
2670 {
2671 pmksa_cache_flush(sm->pmksa, network_ctx, NULL, 0);
2672 }
2673
2674
2675 #ifdef CONFIG_WNM
wpa_wnmsleep_install_key(struct wpa_sm * sm,u8 subelem_id,u8 * buf)2676 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf)
2677 {
2678 u16 keyinfo;
2679 u8 keylen; /* plaintext key len */
2680 u8 *key_rsc;
2681
2682 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) {
2683 struct wpa_gtk_data gd;
2684
2685 os_memset(&gd, 0, sizeof(gd));
2686 keylen = wpa_cipher_key_len(sm->group_cipher);
2687 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
2688 gd.alg = wpa_cipher_to_alg(sm->group_cipher);
2689 if (gd.alg == WPA_ALG_NONE) {
2690 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite");
2691 return -1;
2692 }
2693
2694 key_rsc = buf + 5;
2695 keyinfo = WPA_GET_LE16(buf + 2);
2696 gd.gtk_len = keylen;
2697 if (gd.gtk_len != buf[4]) {
2698 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d",
2699 gd.gtk_len, buf[4]);
2700 return -1;
2701 }
2702 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */
2703 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(
2704 sm, !!(keyinfo & WPA_KEY_INFO_TXRX));
2705
2706 os_memcpy(gd.gtk, buf + 13, gd.gtk_len);
2707
2708 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)",
2709 gd.gtk, gd.gtk_len);
2710 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) {
2711 os_memset(&gd, 0, sizeof(gd));
2712 wpa_printf(MSG_DEBUG, "Failed to install the GTK in "
2713 "WNM mode");
2714 return -1;
2715 }
2716 os_memset(&gd, 0, sizeof(gd));
2717 #ifdef CONFIG_IEEE80211W
2718 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) {
2719 struct wpa_igtk_kde igd;
2720 u16 keyidx;
2721
2722 os_memset(&igd, 0, sizeof(igd));
2723 keylen = wpa_cipher_key_len(sm->mgmt_group_cipher);
2724 os_memcpy(igd.keyid, buf + 2, 2);
2725 os_memcpy(igd.pn, buf + 4, 6);
2726
2727 keyidx = WPA_GET_LE16(igd.keyid);
2728 os_memcpy(igd.igtk, buf + 10, keylen);
2729
2730 wpa_hexdump_key(MSG_DEBUG, "Install IGTK (WNM SLEEP)",
2731 igd.igtk, keylen);
2732 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
2733 broadcast_ether_addr,
2734 keyidx, 0, igd.pn, sizeof(igd.pn),
2735 igd.igtk, keylen) < 0) {
2736 wpa_printf(MSG_DEBUG, "Failed to install the IGTK in "
2737 "WNM mode");
2738 os_memset(&igd, 0, sizeof(igd));
2739 return -1;
2740 }
2741 os_memset(&igd, 0, sizeof(igd));
2742 #endif /* CONFIG_IEEE80211W */
2743 } else {
2744 wpa_printf(MSG_DEBUG, "Unknown element id");
2745 return -1;
2746 }
2747
2748 return 0;
2749 }
2750 #endif /* CONFIG_WNM */
2751
2752
2753 #ifdef CONFIG_PEERKEY
wpa_sm_rx_eapol_peerkey(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2754 int wpa_sm_rx_eapol_peerkey(struct wpa_sm *sm, const u8 *src_addr,
2755 const u8 *buf, size_t len)
2756 {
2757 struct wpa_peerkey *peerkey;
2758
2759 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
2760 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
2761 break;
2762 }
2763
2764 if (!peerkey)
2765 return 0;
2766
2767 wpa_sm_rx_eapol(sm, src_addr, buf, len);
2768
2769 return 1;
2770 }
2771 #endif /* CONFIG_PEERKEY */
2772
2773
2774 #ifdef CONFIG_P2P
2775
wpa_sm_get_p2p_ip_addr(struct wpa_sm * sm,u8 * buf)2776 int wpa_sm_get_p2p_ip_addr(struct wpa_sm *sm, u8 *buf)
2777 {
2778 if (sm == NULL || WPA_GET_BE32(sm->p2p_ip_addr) == 0)
2779 return -1;
2780 os_memcpy(buf, sm->p2p_ip_addr, 3 * 4);
2781 return 0;
2782 }
2783
2784 #endif /* CONFIG_P2P */
2785