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Added support for enforcing frequent PTK rekeying
[thirdparty/hostap.git] / src / rsn_supp / wpa.c
CommitLineData
6fc6879b
JM		 1/*
2 * WPA Supplicant - WPA state machine and EAPOL-Key processing
3 * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#include "includes.h"
16
17#include "common.h"
18#include "rc4.h"
19#include "aes_wrap.h"
20#include "wpa.h"
21#include "eloop.h"
22#include "eapol_supp/eapol_supp_sm.h"
23#include "preauth.h"
24#include "pmksa_cache.h"
25#include "wpa_i.h"
26#include "wpa_ie.h"
27#include "peerkey.h"
28#include "ieee802_11_defs.h"
29
30
31/**
32 * wpa_cipher_txt - Convert cipher suite to a text string
33 * @cipher: Cipher suite (WPA_CIPHER_* enum)
34 * Returns: Pointer to a text string of the cipher suite name
35 */
36static const char * wpa_cipher_txt(int cipher)
37{
38 switch (cipher) {
39 case WPA_CIPHER_NONE:
40 return "NONE";
41 case WPA_CIPHER_WEP40:
42 return "WEP-40";
43 case WPA_CIPHER_WEP104:
44 return "WEP-104";
45 case WPA_CIPHER_TKIP:
46 return "TKIP";
47 case WPA_CIPHER_CCMP:
48 return "CCMP";
49 default:
50 return "UNKNOWN";
51 }
52}
53
54
55/**
56 * wpa_key_mgmt_txt - Convert key management suite to a text string
57 * @key_mgmt: Key management suite (WPA_KEY_MGMT_* enum)
58 * @proto: WPA/WPA2 version (WPA_PROTO_*)
59 * Returns: Pointer to a text string of the key management suite name
60 */
61static const char * wpa_key_mgmt_txt(int key_mgmt, int proto)
62{
63 switch (key_mgmt) {
64 case WPA_KEY_MGMT_IEEE8021X:
65 return proto == WPA_PROTO_RSN ?
66 "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP";
67 case WPA_KEY_MGMT_PSK:
68 return proto == WPA_PROTO_RSN ?
69 "WPA2-PSK" : "WPA-PSK";
70 case WPA_KEY_MGMT_NONE:
71 return "NONE";
72 case WPA_KEY_MGMT_IEEE8021X_NO_WPA:
73 return "IEEE 802.1X (no WPA)";
74#ifdef CONFIG_IEEE80211R
75 case WPA_KEY_MGMT_FT_IEEE8021X:
76 return "FT-EAP";
77 case WPA_KEY_MGMT_FT_PSK:
78 return "FT-PSK";
79#endif /* CONFIG_IEEE80211R */
56586197
JM		 80#ifdef CONFIG_IEEE80211W
81 case WPA_KEY_MGMT_IEEE8021X_SHA256:
82 return "WPA2-EAP-SHA256";
83 case WPA_KEY_MGMT_PSK_SHA256:
84 return "WPA2-PSK-SHA256";
85#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 86 default:
87 return "UNKNOWN";
88 }
89}
90
91
92/**
93 * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message
94 * @sm: Pointer to WPA state machine data from wpa_sm_init()
95 * @kck: Key Confirmation Key (KCK, part of PTK)
96 * @ver: Version field from Key Info
97 * @dest: Destination address for the frame
98 * @proto: Ethertype (usually ETH_P_EAPOL)
99 * @msg: EAPOL-Key message
100 * @msg_len: Length of message
101 * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written
102 */
103void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck,
104 int ver, const u8 *dest, u16 proto,
105 u8 *msg, size_t msg_len, u8 *key_mic)
106{
a8e16edc 107 if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) {
6fc6879b
JM		 108 /*
109 * Association event was not yet received; try to fetch
110 * BSSID from the driver.
111 */
112 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) {
113 wpa_printf(MSG_DEBUG, "WPA: Failed to read BSSID for "
114 "EAPOL-Key destination address");
115 } else {
116 dest = sm->bssid;
117 wpa_printf(MSG_DEBUG, "WPA: Use BSSID (" MACSTR
118 ") as the destination for EAPOL-Key",
119 MAC2STR(dest));
120 }
121 }
122 if (key_mic)
123 wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic);
124 wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len);
125 wpa_sm_ether_send(sm, dest, proto, msg, msg_len);
126 eapol_sm_notify_tx_eapol_key(sm->eapol);
127 os_free(msg);
128}
129
130
131/**
132 * wpa_sm_key_request - Send EAPOL-Key Request
133 * @sm: Pointer to WPA state machine data from wpa_sm_init()
134 * @error: Indicate whether this is an Michael MIC error report
135 * @pairwise: 1 = error report for pairwise packet, 0 = for group packet
6fc6879b
JM		 136 *
137 * Send an EAPOL-Key Request to the current authenticator. This function is
138 * used to request rekeying and it is usually called when a local Michael MIC
139 * failure is detected.
140 */
141void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
142{
143 size_t rlen;
144 struct wpa_eapol_key *reply;
145 int key_info, ver;
146 u8 bssid[ETH_ALEN], *rbuf;
147
56586197 148 if (wpa_key_mgmt_ft(sm->key_mgmt) || wpa_key_mgmt_sha256(sm->key_mgmt))
6fc6879b
JM		 149 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
150 else if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
151 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
152 else
153 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
154
155 if (wpa_sm_get_bssid(sm, bssid) < 0) {
156 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
157 "request");
158 return;
159 }
160
161 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
162 sizeof(*reply), &rlen, (void *) &reply);
163 if (rbuf == NULL)
164 return;
165
166 reply->type = sm->proto == WPA_PROTO_RSN ?
167 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
168 key_info = WPA_KEY_INFO_REQUEST | ver;
169 if (sm->ptk_set)
170 key_info |= WPA_KEY_INFO_MIC;
171 if (error)
172 key_info |= WPA_KEY_INFO_ERROR;
173 if (pairwise)
174 key_info |= WPA_KEY_INFO_KEY_TYPE;
175 WPA_PUT_BE16(reply->key_info, key_info);
176 WPA_PUT_BE16(reply->key_length, 0);
177 os_memcpy(reply->replay_counter, sm->request_counter,
178 WPA_REPLAY_COUNTER_LEN);
179 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
180
181 WPA_PUT_BE16(reply->key_data_length, 0);
182
183 wpa_printf(MSG_INFO, "WPA: Sending EAPOL-Key Request (error=%d "
184 "pairwise=%d ptk_set=%d len=%lu)",
185 error, pairwise, sm->ptk_set, (unsigned long) rlen);
186 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
187 rbuf, rlen, key_info & WPA_KEY_INFO_MIC ?
188 reply->key_mic : NULL);
189}
190
191
192static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
193 const unsigned char *src_addr,
194 const u8 *pmkid)
195{
196 int abort_cached = 0;
197
198 if (pmkid && !sm->cur_pmksa) {
199 /* When using drivers that generate RSN IE, wpa_supplicant may
200 * not have enough time to get the association information
201 * event before receiving this 1/4 message, so try to find a
202 * matching PMKSA cache entry here. */
203 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid);
204 if (sm->cur_pmksa) {
205 wpa_printf(MSG_DEBUG, "RSN: found matching PMKID from "
206 "PMKSA cache");
207 } else {
208 wpa_printf(MSG_DEBUG, "RSN: no matching PMKID found");
209 abort_cached = 1;
210 }
211 }
212
213 if (pmkid && sm->cur_pmksa &&
214 os_memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
215 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
216 wpa_sm_set_pmk_from_pmksa(sm);
217 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
218 sm->pmk, sm->pmk_len);
219 eapol_sm_notify_cached(sm->eapol);
220#ifdef CONFIG_IEEE80211R
221 sm->xxkey_len = 0;
222#endif /* CONFIG_IEEE80211R */
56586197 223 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
6fc6879b
JM		 224 int res, pmk_len;
225 pmk_len = PMK_LEN;
226 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN);
227 if (res) {
228 /*
229 * EAP-LEAP is an exception from other EAP methods: it
230 * uses only 16-byte PMK.
231 */
232 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
233 pmk_len = 16;
234 } else {
235#ifdef CONFIG_IEEE80211R
236 u8 buf[2 * PMK_LEN];
237 if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
238 {
239 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
240 sm->xxkey_len = PMK_LEN;
241 os_memset(buf, 0, sizeof(buf));
242 }
243#endif /* CONFIG_IEEE80211R */
244 }
245 if (res == 0) {
246 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
247 "machines", sm->pmk, pmk_len);
248 sm->pmk_len = pmk_len;
249 pmksa_cache_add(sm->pmksa, sm->pmk, pmk_len, src_addr,
56586197
JM		 250 sm->own_addr, sm->network_ctx,
251 sm->key_mgmt);
6fc6879b
JM		 252 if (!sm->cur_pmksa && pmkid &&
253 pmksa_cache_get(sm->pmksa, src_addr, pmkid)) {
254 wpa_printf(MSG_DEBUG, "RSN: the new PMK "
255 "matches with the PMKID");
256 abort_cached = 0;
257 }
258 } else {
259 wpa_msg(sm->ctx->ctx, MSG_WARNING,
260 "WPA: Failed to get master session key from "
261 "EAPOL state machines");
262 wpa_msg(sm->ctx->ctx, MSG_WARNING,
263 "WPA: Key handshake aborted");
264 if (sm->cur_pmksa) {
265 wpa_printf(MSG_DEBUG, "RSN: Cancelled PMKSA "
266 "caching attempt");
267 sm->cur_pmksa = NULL;
268 abort_cached = 1;
269 } else {
270 return -1;
271 }
272 }
273 }
274
56586197 275 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) {
6fc6879b
JM		 276 /* Send EAPOL-Start to trigger full EAP authentication. */
277 u8 *buf;
278 size_t buflen;
279
280 wpa_printf(MSG_DEBUG, "RSN: no PMKSA entry found - trigger "
281 "full EAP authentication");
282 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
283 NULL, 0, &buflen, NULL);
284 if (buf) {
285 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
286 buf, buflen);
287 os_free(buf);
288 }
289
290 return -1;
291 }
292
293 return 0;
294}
295
296
297/**
298 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
299 * @sm: Pointer to WPA state machine data from wpa_sm_init()
300 * @dst: Destination address for the frame
301 * @key: Pointer to the EAPOL-Key frame header
302 * @ver: Version bits from EAPOL-Key Key Info
303 * @nonce: Nonce value for the EAPOL-Key frame
304 * @wpa_ie: WPA/RSN IE
305 * @wpa_ie_len: Length of the WPA/RSN IE
306 * @ptk: PTK to use for keyed hash and encryption
307 * Returns: 0 on success, -1 on failure
308 */
309int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
310 const struct wpa_eapol_key *key,
311 int ver, const u8 *nonce,
312 const u8 *wpa_ie, size_t wpa_ie_len,
313 struct wpa_ptk *ptk)
314{
315 size_t rlen;
316 struct wpa_eapol_key *reply;
317 u8 *rbuf;
318
319 if (wpa_ie == NULL) {
320 wpa_printf(MSG_WARNING, "WPA: No wpa_ie set - cannot "
321 "generate msg 2/4");
322 return -1;
323 }
324
325 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
326
327 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
328 NULL, sizeof(*reply) + wpa_ie_len,
329 &rlen, (void *) &reply);
330 if (rbuf == NULL)
331 return -1;
332
333 reply->type = sm->proto == WPA_PROTO_RSN ?
334 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
335 WPA_PUT_BE16(reply->key_info,
336 ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC);
337 if (sm->proto == WPA_PROTO_RSN)
338 WPA_PUT_BE16(reply->key_length, 0);
339 else
340 os_memcpy(reply->key_length, key->key_length, 2);
341 os_memcpy(reply->replay_counter, key->replay_counter,
342 WPA_REPLAY_COUNTER_LEN);
343
344 WPA_PUT_BE16(reply->key_data_length, wpa_ie_len);
345 os_memcpy(reply + 1, wpa_ie, wpa_ie_len);
346
347 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
348
349 wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
350 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
351 rbuf, rlen, reply->key_mic);
352
353 return 0;
354}
355
356
357static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
358 const struct wpa_eapol_key *key,
359 struct wpa_ptk *ptk)
360{
361#ifdef CONFIG_IEEE80211R
56586197 362 if (wpa_key_mgmt_ft(sm->key_mgmt))
6fc6879b
JM		 363 return wpa_derive_ptk_ft(sm, src_addr, key, ptk);
364#endif /* CONFIG_IEEE80211R */
365
366 wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
367 sm->own_addr, sm->bssid, sm->snonce, key->key_nonce,
56586197
JM		 368 (u8 *) ptk, sizeof(*ptk),
369 wpa_key_mgmt_sha256(sm->key_mgmt));
6fc6879b
JM		 370 return 0;
371}
372
373
374static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
375 const unsigned char *src_addr,
376 const struct wpa_eapol_key *key,
377 u16 ver)
378{
379 struct wpa_eapol_ie_parse ie;
380 struct wpa_ptk *ptk;
381 u8 buf[8];
382
383 if (wpa_sm_get_network_ctx(sm) == NULL) {
384 wpa_printf(MSG_WARNING, "WPA: No SSID info found (msg 1 of "
385 "4).");
386 return;
387 }
388
389 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
390 wpa_printf(MSG_DEBUG, "WPA: RX message 1 of 4-Way Handshake from "
391 MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
392
393 os_memset(&ie, 0, sizeof(ie));
394
395#ifndef CONFIG_NO_WPA2
396 if (sm->proto == WPA_PROTO_RSN) {
397 /* RSN: msg 1/4 should contain PMKID for the selected PMK */
398 const u8 *_buf = (const u8 *) (key + 1);
399 size_t len = WPA_GET_BE16(key->key_data_length);
400 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len);
401 wpa_supplicant_parse_ies(_buf, len, &ie);
402 if (ie.pmkid) {
403 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
404 "Authenticator", ie.pmkid, PMKID_LEN);
405 }
406 }
407#endif /* CONFIG_NO_WPA2 */
408
409 if (wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid))
410 return;
411
412 if (sm->renew_snonce) {
413 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
414 wpa_msg(sm->ctx->ctx, MSG_WARNING,
415 "WPA: Failed to get random data for SNonce");
416 return;
417 }
418 sm->renew_snonce = 0;
419 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
420 sm->snonce, WPA_NONCE_LEN);
421 }
422
423 /* Calculate PTK which will be stored as a temporary PTK until it has
424 * been verified when processing message 3/4. */
425 ptk = &sm->tptk;
426 wpa_derive_ptk(sm, src_addr, key, ptk);
427 /* Supplicant: swap tx/rx Mic keys */
428 os_memcpy(buf, ptk->u.auth.tx_mic_key, 8);
429 os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8);
430 os_memcpy(ptk->u.auth.rx_mic_key, buf, 8);
431 sm->tptk_set = 1;
432
433 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
434 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len,
435 ptk))
436 return;
437
438 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
439}
440
441
442static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
443{
444 struct wpa_sm *sm = eloop_ctx;
445 rsn_preauth_candidate_process(sm);
446}
447
448
449static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
450 const u8 *addr, int secure)
451{
452 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Key negotiation completed with "
453 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
454 wpa_cipher_txt(sm->pairwise_cipher),
455 wpa_cipher_txt(sm->group_cipher));
6fc6879b
JM		 456 wpa_sm_cancel_auth_timeout(sm);
457 wpa_sm_set_state(sm, WPA_COMPLETED);
458
459 if (secure) {
460 wpa_sm_mlme_setprotection(
461 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
462 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
463 eapol_sm_notify_portValid(sm->eapol, TRUE);
56586197 464 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt))
6fc6879b
JM		 465 eapol_sm_notify_eap_success(sm->eapol, TRUE);
466 /*
467 * Start preauthentication after a short wait to avoid a
468 * possible race condition between the data receive and key
469 * configuration after the 4-Way Handshake. This increases the
470 * likelyhood of the first preauth EAPOL-Start frame getting to
471 * the target AP.
472 */
473 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
474 }
475
476 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
477 wpa_printf(MSG_DEBUG, "RSN: Authenticator accepted "
478 "opportunistic PMKSA entry - marking it valid");
479 sm->cur_pmksa->opportunistic = 0;
480 }
481
482#ifdef CONFIG_IEEE80211R
56586197 483 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
6fc6879b
JM		 484 /* Prepare for the next transition */
485 wpa_ft_prepare_auth_request(sm);
486 }
487#endif /* CONFIG_IEEE80211R */
488}
489
490
581a8cde
JM		 491static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
492{
493 struct wpa_sm *sm = eloop_ctx;
494 wpa_printf(MSG_DEBUG, "WPA: Request PTK rekeying");
495 wpa_sm_key_request(sm, 0, 1);
496}
497
498
6fc6879b
JM		 499static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
500 const struct wpa_eapol_key *key)
501{
502 int keylen, rsclen;
503 wpa_alg alg;
504 const u8 *key_rsc;
505 u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
506
507 wpa_printf(MSG_DEBUG, "WPA: Installing PTK to the driver.");
508
509 switch (sm->pairwise_cipher) {
510 case WPA_CIPHER_CCMP:
511 alg = WPA_ALG_CCMP;
512 keylen = 16;
513 rsclen = 6;
514 break;
515 case WPA_CIPHER_TKIP:
516 alg = WPA_ALG_TKIP;
517 keylen = 32;
518 rsclen = 6;
519 break;
520 case WPA_CIPHER_NONE:
521 wpa_printf(MSG_DEBUG, "WPA: Pairwise Cipher Suite: "
522 "NONE - do not use pairwise keys");
523 return 0;
524 default:
525 wpa_printf(MSG_WARNING, "WPA: Unsupported pairwise cipher %d",
526 sm->pairwise_cipher);
527 return -1;
528 }
529
530 if (sm->proto == WPA_PROTO_RSN) {
531 key_rsc = null_rsc;
532 } else {
533 key_rsc = key->key_rsc;
534 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
535 }
536
537 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
538 (u8 *) sm->ptk.tk1, keylen) < 0) {
539 wpa_printf(MSG_WARNING, "WPA: Failed to set PTK to the "
540 "driver.");
541 return -1;
542 }
581a8cde
JM		 543
544 if (sm->wpa_ptk_rekey) {
545 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
546 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
547 sm, NULL);
548 }
549
6fc6879b
JM		 550 return 0;
551}
552
553
554static int wpa_supplicant_check_group_cipher(int group_cipher,
555 int keylen, int maxkeylen,
556 int *key_rsc_len, wpa_alg *alg)
557{
558 int ret = 0;
559
560 switch (group_cipher) {
561 case WPA_CIPHER_CCMP:
562 if (keylen != 16 || maxkeylen < 16) {
563 ret = -1;
564 break;
565 }
566 *key_rsc_len = 6;
567 *alg = WPA_ALG_CCMP;
568 break;
569 case WPA_CIPHER_TKIP:
570 if (keylen != 32 || maxkeylen < 32) {
571 ret = -1;
572 break;
573 }
574 *key_rsc_len = 6;
575 *alg = WPA_ALG_TKIP;
576 break;
577 case WPA_CIPHER_WEP104:
578 if (keylen != 13 || maxkeylen < 13) {
579 ret = -1;
580 break;
581 }
582 *key_rsc_len = 0;
583 *alg = WPA_ALG_WEP;
584 break;
585 case WPA_CIPHER_WEP40:
586 if (keylen != 5 || maxkeylen < 5) {
587 ret = -1;
588 break;
589 }
590 *key_rsc_len = 0;
591 *alg = WPA_ALG_WEP;
592 break;
593 default:
594 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
595 group_cipher);
596 return -1;
597 }
598
599 if (ret < 0 ) {
600 wpa_printf(MSG_WARNING, "WPA: Unsupported %s Group Cipher key "
601 "length %d (%d).",
602 wpa_cipher_txt(group_cipher), keylen, maxkeylen);
603 }
604
605 return ret;
606}
607
608
609struct wpa_gtk_data {
610 wpa_alg alg;
611 int tx, key_rsc_len, keyidx;
612 u8 gtk[32];
613 int gtk_len;
614};
615
616
617static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
618 const struct wpa_gtk_data *gd,
619 const u8 *key_rsc)
620{
621 const u8 *_gtk = gd->gtk;
622 u8 gtk_buf[32];
623
624 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
625 wpa_printf(MSG_DEBUG, "WPA: Installing GTK to the driver "
626 "(keyidx=%d tx=%d len=%d).", gd->keyidx, gd->tx,
627 gd->gtk_len);
628 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
629 if (sm->group_cipher == WPA_CIPHER_TKIP) {
630 /* Swap Tx/Rx keys for Michael MIC */
631 os_memcpy(gtk_buf, gd->gtk, 16);
632 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
633 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
634 _gtk = gtk_buf;
635 }
636 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
637 if (wpa_sm_set_key(sm, gd->alg,
638 (u8 *) "\xff\xff\xff\xff\xff\xff",
639 gd->keyidx, 1, key_rsc, gd->key_rsc_len,
640 _gtk, gd->gtk_len) < 0) {
641 wpa_printf(MSG_WARNING, "WPA: Failed to set "
642 "GTK to the driver (Group only).");
643 return -1;
644 }
645 } else if (wpa_sm_set_key(sm, gd->alg,
646 (u8 *) "\xff\xff\xff\xff\xff\xff",
647 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
648 _gtk, gd->gtk_len) < 0) {
649 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to "
650 "the driver.");
651 return -1;
652 }
653
654 return 0;
655}
656
657
658static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
659 int tx)
660{
661 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
662 /* Ignore Tx bit for GTK if a pairwise key is used. One AP
663 * seemed to set this bit (incorrectly, since Tx is only when
664 * doing Group Key only APs) and without this workaround, the
665 * data connection does not work because wpa_supplicant
666 * configured non-zero keyidx to be used for unicast. */
667 wpa_printf(MSG_INFO, "WPA: Tx bit set for GTK, but pairwise "
668 "keys are used - ignore Tx bit");
669 return 0;
670 }
671 return tx;
672}
673
674
675static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
676 const struct wpa_eapol_key *key,
677 const u8 *gtk, size_t gtk_len,
678 int key_info)
679{
680#ifndef CONFIG_NO_WPA2
681 struct wpa_gtk_data gd;
682
683 /*
684 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
685 * GTK KDE format:
686 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
687 * Reserved [bits 0-7]
688 * GTK
689 */
690
691 os_memset(&gd, 0, sizeof(gd));
692 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
693 gtk, gtk_len);
694
695 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
696 return -1;
697
698 gd.keyidx = gtk[0] & 0x3;
699 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
700 !!(gtk[0] & BIT(2)));
701 gtk += 2;
702 gtk_len -= 2;
703
704 os_memcpy(gd.gtk, gtk, gtk_len);
705 gd.gtk_len = gtk_len;
706
707 if (wpa_supplicant_check_group_cipher(sm->group_cipher,
708 gtk_len, gtk_len,
709 &gd.key_rsc_len, &gd.alg) ||
710 wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) {
711 wpa_printf(MSG_DEBUG, "RSN: Failed to install GTK");
712 return -1;
713 }
714
715 wpa_supplicant_key_neg_complete(sm, sm->bssid,
716 key_info & WPA_KEY_INFO_SECURE);
717 return 0;
718#else /* CONFIG_NO_WPA2 */
719 return -1;
720#endif /* CONFIG_NO_WPA2 */
721}
722
723
724static int ieee80211w_set_keys(struct wpa_sm *sm,
725 struct wpa_eapol_ie_parse *ie)
726{
727#ifdef CONFIG_IEEE80211W
728 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
729 return 0;
730
731 if (ie->igtk) {
732 const struct wpa_igtk_kde *igtk;
733 u16 keyidx;
734 if (ie->igtk_len != sizeof(*igtk))
735 return -1;
736 igtk = (const struct wpa_igtk_kde *) ie->igtk;
737 keyidx = WPA_GET_LE16(igtk->keyid);
738 wpa_printf(MSG_DEBUG, "WPA: IGTK keyid %d "
739 "pn %02x%02x%02x%02x%02x%02x",
740 keyidx, MAC2STR(igtk->pn));
741 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK",
742 igtk->igtk, WPA_IGTK_LEN);
743 if (keyidx > 4095) {
744 wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KeyID %d",
745 keyidx);
746 return -1;
747 }
748 if (wpa_sm_set_key(sm, WPA_ALG_IGTK,
749 (u8 *) "\xff\xff\xff\xff\xff\xff",
750 keyidx, 0, igtk->pn, sizeof(igtk->pn),
751 igtk->igtk, WPA_IGTK_LEN) < 0) {
752 wpa_printf(MSG_WARNING, "WPA: Failed to configure IGTK"
753 " to the driver");
754 return -1;
755 }
756 }
757
758 return 0;
759#else /* CONFIG_IEEE80211W */
760 return 0;
761#endif /* CONFIG_IEEE80211W */
762}
763
764
765static void wpa_report_ie_mismatch(struct wpa_sm *sm,
766 const char *reason, const u8 *src_addr,
767 const u8 *wpa_ie, size_t wpa_ie_len,
768 const u8 *rsn_ie, size_t rsn_ie_len)
769{
770 wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
771 reason, MAC2STR(src_addr));
772
773 if (sm->ap_wpa_ie) {
774 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
775 sm->ap_wpa_ie, sm->ap_wpa_ie_len);
776 }
777 if (wpa_ie) {
778 if (!sm->ap_wpa_ie) {
779 wpa_printf(MSG_INFO, "WPA: No WPA IE in "
780 "Beacon/ProbeResp");
781 }
782 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
783 wpa_ie, wpa_ie_len);
784 }
785
786 if (sm->ap_rsn_ie) {
787 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
788 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
789 }
790 if (rsn_ie) {
791 if (!sm->ap_rsn_ie) {
792 wpa_printf(MSG_INFO, "WPA: No RSN IE in "
793 "Beacon/ProbeResp");
794 }
795 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
796 rsn_ie, rsn_ie_len);
797 }
798
799 wpa_sm_disassociate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
6fc6879b
JM		 800}
801
802
803static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
804 const unsigned char *src_addr,
805 struct wpa_eapol_ie_parse *ie)
806{
807 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
808 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE for this AP known. "
809 "Trying to get from scan results");
810 if (wpa_sm_get_beacon_ie(sm) < 0) {
811 wpa_printf(MSG_WARNING, "WPA: Could not find AP from "
812 "the scan results");
813 } else {
814 wpa_printf(MSG_DEBUG, "WPA: Found the current AP from "
815 "updated scan results");
816 }
817 }
818
819 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
820 (sm->ap_wpa_ie || sm->ap_rsn_ie)) {
821 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
822 "with IE in Beacon/ProbeResp (no IE?)",
823 src_addr, ie->wpa_ie, ie->wpa_ie_len,
824 ie->rsn_ie, ie->rsn_ie_len);
825 return -1;
826 }
827
828 if ((ie->wpa_ie && sm->ap_wpa_ie &&
829 (ie->wpa_ie_len != sm->ap_wpa_ie_len ||
830 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
831 (ie->rsn_ie && sm->ap_rsn_ie &&
832 (ie->rsn_ie_len != sm->ap_rsn_ie_len ||
833 os_memcmp(ie->rsn_ie, sm->ap_rsn_ie, ie->rsn_ie_len) != 0))) {
834 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
835 "with IE in Beacon/ProbeResp",
836 src_addr, ie->wpa_ie, ie->wpa_ie_len,
837 ie->rsn_ie, ie->rsn_ie_len);
838 return -1;
839 }
840
841 if (sm->proto == WPA_PROTO_WPA &&
842 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
843 wpa_report_ie_mismatch(sm, "Possible downgrade attack "
844 "detected - RSN was enabled and RSN IE "
845 "was in msg 3/4, but not in "
846 "Beacon/ProbeResp",
847 src_addr, ie->wpa_ie, ie->wpa_ie_len,
848 ie->rsn_ie, ie->rsn_ie_len);
849 return -1;
850 }
851
852#ifdef CONFIG_IEEE80211R
56586197 853 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
6fc6879b
JM		 854 struct rsn_mdie *mdie;
855 /* TODO: verify that full MDIE matches with the one from scan
856 * results, not only mobility domain */
857 mdie = (struct rsn_mdie *) (ie->mdie + 2);
858 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
859 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
860 MOBILITY_DOMAIN_ID_LEN) != 0) {
861 wpa_printf(MSG_DEBUG, "FT: MDIE in msg 3/4 did not "
862 "match with the current mobility domain");
863 return -1;
864 }
865 }
866#endif /* CONFIG_IEEE80211R */
867
868 return 0;
869}
870
871
872/**
873 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
874 * @sm: Pointer to WPA state machine data from wpa_sm_init()
875 * @dst: Destination address for the frame
876 * @key: Pointer to the EAPOL-Key frame header
877 * @ver: Version bits from EAPOL-Key Key Info
878 * @key_info: Key Info
879 * @kde: KDEs to include the EAPOL-Key frame
880 * @kde_len: Length of KDEs
881 * @ptk: PTK to use for keyed hash and encryption
882 * Returns: 0 on success, -1 on failure
883 */
884int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
885 const struct wpa_eapol_key *key,
886 u16 ver, u16 key_info,
887 const u8 *kde, size_t kde_len,
888 struct wpa_ptk *ptk)
889{
890 size_t rlen;
891 struct wpa_eapol_key *reply;
892 u8 *rbuf;
893
894 if (kde)
895 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len);
896
897 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
898 sizeof(*reply) + kde_len,
899 &rlen, (void *) &reply);
900 if (rbuf == NULL)
901 return -1;
902
903 reply->type = sm->proto == WPA_PROTO_RSN ?
904 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
905 key_info &= WPA_KEY_INFO_SECURE;
906 key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC;
907 WPA_PUT_BE16(reply->key_info, key_info);
908 if (sm->proto == WPA_PROTO_RSN)
909 WPA_PUT_BE16(reply->key_length, 0);
910 else
911 os_memcpy(reply->key_length, key->key_length, 2);
912 os_memcpy(reply->replay_counter, key->replay_counter,
913 WPA_REPLAY_COUNTER_LEN);
914
915 WPA_PUT_BE16(reply->key_data_length, kde_len);
916 if (kde)
917 os_memcpy(reply + 1, kde, kde_len);
918
919 wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
920 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
921 rbuf, rlen, reply->key_mic);
922
923 return 0;
924}
925
926
927static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
928 const struct wpa_eapol_key *key,
929 u16 ver)
930{
931 u16 key_info, keylen, len;
932 const u8 *pos;
933 struct wpa_eapol_ie_parse ie;
934
935 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
936 wpa_printf(MSG_DEBUG, "WPA: RX message 3 of 4-Way Handshake from "
937 MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
938
939 key_info = WPA_GET_BE16(key->key_info);
940
941 pos = (const u8 *) (key + 1);
942 len = WPA_GET_BE16(key->key_data_length);
943 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len);
944 wpa_supplicant_parse_ies(pos, len, &ie);
945 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
946 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
947 return;
948 }
949#ifdef CONFIG_IEEE80211W
950 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
951 wpa_printf(MSG_WARNING, "WPA: IGTK KDE in unencrypted key "
952 "data");
953 return;
954 }
955
956 if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) {
957 wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KDE length %lu",
958 (unsigned long) ie.igtk_len);
959 return;
960 }
961#endif /* CONFIG_IEEE80211W */
962
963 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
964 return;
965
966 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
967 wpa_printf(MSG_WARNING, "WPA: ANonce from message 1 of 4-Way "
968 "Handshake differs from 3 of 4-Way Handshake - drop"
969 " packet (src=" MACSTR ")", MAC2STR(sm->bssid));
970 return;
971 }
972
973 keylen = WPA_GET_BE16(key->key_length);
974 switch (sm->pairwise_cipher) {
975 case WPA_CIPHER_CCMP:
976 if (keylen != 16) {
977 wpa_printf(MSG_WARNING, "WPA: Invalid CCMP key length "
978 "%d (src=" MACSTR ")",
979 keylen, MAC2STR(sm->bssid));
980 return;
981 }
982 break;
983 case WPA_CIPHER_TKIP:
984 if (keylen != 32) {
985 wpa_printf(MSG_WARNING, "WPA: Invalid TKIP key length "
986 "%d (src=" MACSTR ")",
987 keylen, MAC2STR(sm->bssid));
988 return;
989 }
990 break;
991 }
992
993 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
994 NULL, 0, &sm->ptk))
995 return;
996
997 /* SNonce was successfully used in msg 3/4, so mark it to be renewed
998 * for the next 4-Way Handshake. If msg 3 is received again, the old
999 * SNonce will still be used to avoid changing PTK. */
1000 sm->renew_snonce = 1;
1001
1002 if (key_info & WPA_KEY_INFO_INSTALL) {
1003 wpa_supplicant_install_ptk(sm, key);
1004 }
1005
1006 if (key_info & WPA_KEY_INFO_SECURE) {
1007 wpa_sm_mlme_setprotection(
1008 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
1009 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
1010 eapol_sm_notify_portValid(sm->eapol, TRUE);
1011 }
1012 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1013
1014 if (ie.gtk &&
1015 wpa_supplicant_pairwise_gtk(sm, key,
1016 ie.gtk, ie.gtk_len, key_info) < 0) {
1017 wpa_printf(MSG_INFO, "RSN: Failed to configure GTK");
1018 }
1019
1020 if (ieee80211w_set_keys(sm, &ie) < 0)
1021 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
1022}
1023
1024
1025static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
1026 const u8 *keydata,
1027 size_t keydatalen,
1028 u16 key_info,
1029 struct wpa_gtk_data *gd)
1030{
1031 int maxkeylen;
1032 struct wpa_eapol_ie_parse ie;
1033
1034 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen);
1035 wpa_supplicant_parse_ies(keydata, keydatalen, &ie);
1036 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1037 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
1038 return -1;
1039 }
1040 if (ie.gtk == NULL) {
1041 wpa_printf(MSG_INFO, "WPA: No GTK IE in Group Key msg 1/2");
1042 return -1;
1043 }
1044 maxkeylen = gd->gtk_len = ie.gtk_len - 2;
1045
1046 if (wpa_supplicant_check_group_cipher(sm->group_cipher,
1047 gd->gtk_len, maxkeylen,
1048 &gd->key_rsc_len, &gd->alg))
1049 return -1;
1050
1051 wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake",
1052 ie.gtk, ie.gtk_len);
1053 gd->keyidx = ie.gtk[0] & 0x3;
1054 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
1055 !!(ie.gtk[0] & BIT(2)));
1056 if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
1057 wpa_printf(MSG_INFO, "RSN: Too long GTK in GTK IE "
1058 "(len=%lu)", (unsigned long) ie.gtk_len - 2);
1059 return -1;
1060 }
1061 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
1062
1063 if (ieee80211w_set_keys(sm, &ie) < 0)
1064 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
1065
1066 return 0;
1067}
1068
1069
1070static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
1071 const struct wpa_eapol_key *key,
1072 size_t keydatalen, int key_info,
1073 size_t extra_len, u16 ver,
1074 struct wpa_gtk_data *gd)
1075{
1076 size_t maxkeylen;
1077 u8 ek[32];
1078
1079 gd->gtk_len = WPA_GET_BE16(key->key_length);
1080 maxkeylen = keydatalen;
1081 if (keydatalen > extra_len) {
1082 wpa_printf(MSG_INFO, "WPA: Truncated EAPOL-Key packet:"
1083 " key_data_length=%lu > extra_len=%lu",
1084 (unsigned long) keydatalen,
1085 (unsigned long) extra_len);
1086 return -1;
1087 }
1088 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1089 if (maxkeylen < 8) {
1090 wpa_printf(MSG_INFO, "WPA: Too short maxkeylen (%lu)",
1091 (unsigned long) maxkeylen);
1092 return -1;
1093 }
1094 maxkeylen -= 8;
1095 }
1096
1097 if (wpa_supplicant_check_group_cipher(sm->group_cipher,
1098 gd->gtk_len, maxkeylen,
1099 &gd->key_rsc_len, &gd->alg))
1100 return -1;
1101
1102 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1103 WPA_KEY_INFO_KEY_INDEX_SHIFT;
1104 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1105 os_memcpy(ek, key->key_iv, 16);
1106 os_memcpy(ek + 16, sm->ptk.kek, 16);
1107 if (keydatalen > sizeof(gd->gtk)) {
1108 wpa_printf(MSG_WARNING, "WPA: RC4 key data "
1109 "too long (%lu)",
1110 (unsigned long) keydatalen);
1111 return -1;
1112 }
1113 os_memcpy(gd->gtk, key + 1, keydatalen);
1114 rc4_skip(ek, 32, 256, gd->gtk, keydatalen);
1115 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1116 if (keydatalen % 8) {
1117 wpa_printf(MSG_WARNING, "WPA: Unsupported AES-WRAP "
1118 "len %lu", (unsigned long) keydatalen);
1119 return -1;
1120 }
1121 if (maxkeylen > sizeof(gd->gtk)) {
1122 wpa_printf(MSG_WARNING, "WPA: AES-WRAP key data "
1123 "too long (keydatalen=%lu maxkeylen=%lu)",
1124 (unsigned long) keydatalen,
1125 (unsigned long) maxkeylen);
1126 return -1;
1127 }
1128 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8,
1129 (const u8 *) (key + 1), gd->gtk)) {
1130 wpa_printf(MSG_WARNING, "WPA: AES unwrap "
1131 "failed - could not decrypt GTK");
1132 return -1;
1133 }
1134 } else {
1135 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
1136 ver);
1137 return -1;
1138 }
1139 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1140 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1141 return 0;
1142}
1143
1144
1145static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1146 const struct wpa_eapol_key *key,
1147 int ver, u16 key_info)
1148{
1149 size_t rlen;
1150 struct wpa_eapol_key *reply;
1151 u8 *rbuf;
1152
1153 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1154 sizeof(*reply), &rlen, (void *) &reply);
1155 if (rbuf == NULL)
1156 return -1;
1157
1158 reply->type = sm->proto == WPA_PROTO_RSN ?
1159 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1160 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1161 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
1162 WPA_PUT_BE16(reply->key_info, key_info);
1163 if (sm->proto == WPA_PROTO_RSN)
1164 WPA_PUT_BE16(reply->key_length, 0);
1165 else
1166 os_memcpy(reply->key_length, key->key_length, 2);
1167 os_memcpy(reply->replay_counter, key->replay_counter,
1168 WPA_REPLAY_COUNTER_LEN);
1169
1170 WPA_PUT_BE16(reply->key_data_length, 0);
1171
1172 wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1173 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL,
1174 rbuf, rlen, reply->key_mic);
1175
1176 return 0;
1177}
1178
1179
1180static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1181 const unsigned char *src_addr,
1182 const struct wpa_eapol_key *key,
1183 int extra_len, u16 ver)
1184{
1185 u16 key_info, keydatalen;
1186 int rekey, ret;
1187 struct wpa_gtk_data gd;
1188
1189 os_memset(&gd, 0, sizeof(gd));
1190
1191 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1192 wpa_printf(MSG_DEBUG, "WPA: RX message 1 of Group Key Handshake from "
1193 MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1194
1195 key_info = WPA_GET_BE16(key->key_info);
1196 keydatalen = WPA_GET_BE16(key->key_data_length);
1197
1198 if (sm->proto == WPA_PROTO_RSN) {
1199 ret = wpa_supplicant_process_1_of_2_rsn(sm,
1200 (const u8 *) (key + 1),
1201 keydatalen, key_info,
1202 &gd);
1203 } else {
1204 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen,
1205 key_info, extra_len,
1206 ver, &gd);
1207 }
1208
1209 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1210
1211 if (ret)
1212 return;
1213
1214 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) ||
1215 wpa_supplicant_send_2_of_2(sm, key, ver, key_info))
1216 return;
1217
1218 if (rekey) {
1219 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Group rekeying "
1220 "completed with " MACSTR " [GTK=%s]",
1221 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1222 wpa_sm_cancel_auth_timeout(sm);
1223 wpa_sm_set_state(sm, WPA_COMPLETED);
1224 } else {
1225 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1226 key_info &
1227 WPA_KEY_INFO_SECURE);
1228 }
1229}
1230
1231
1232static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1233 struct wpa_eapol_key *key,
1234 u16 ver,
1235 const u8 *buf, size_t len)
1236{
1237 u8 mic[16];
1238 int ok = 0;
1239
1240 os_memcpy(mic, key->key_mic, 16);
1241 if (sm->tptk_set) {
1242 os_memset(key->key_mic, 0, 16);
1243 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len,
1244 key->key_mic);
1245 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1246 wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC "
1247 "when using TPTK - ignoring TPTK");
1248 } else {
1249 ok = 1;
1250 sm->tptk_set = 0;
1251 sm->ptk_set = 1;
1252 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1253 }
1254 }
1255
1256 if (!ok && sm->ptk_set) {
1257 os_memset(key->key_mic, 0, 16);
1258 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len,
1259 key->key_mic);
1260 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1261 wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC "
1262 "- dropping packet");
1263 return -1;
1264 }
1265 ok = 1;
1266 }
1267
1268 if (!ok) {
1269 wpa_printf(MSG_WARNING, "WPA: Could not verify EAPOL-Key MIC "
1270 "- dropping packet");
1271 return -1;
1272 }
1273
1274 os_memcpy(sm->rx_replay_counter, key->replay_counter,
1275 WPA_REPLAY_COUNTER_LEN);
1276 sm->rx_replay_counter_set = 1;
1277 return 0;
1278}
1279
1280
1281/* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
1282static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1283 struct wpa_eapol_key *key, u16 ver)
1284{
1285 u16 keydatalen = WPA_GET_BE16(key->key_data_length);
1286
1287 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1288 (u8 *) (key + 1), keydatalen);
1289 if (!sm->ptk_set) {
1290 wpa_printf(MSG_WARNING, "WPA: PTK not available, "
1291 "cannot decrypt EAPOL-Key key data.");
1292 return -1;
1293 }
1294
1295 /* Decrypt key data here so that this operation does not need
1296 * to be implemented separately for each message type. */
1297 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1298 u8 ek[32];
1299 os_memcpy(ek, key->key_iv, 16);
1300 os_memcpy(ek + 16, sm->ptk.kek, 16);
1301 rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen);
1302 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1303 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1304 u8 *buf;
1305 if (keydatalen % 8) {
1306 wpa_printf(MSG_WARNING, "WPA: Unsupported "
1307 "AES-WRAP len %d", keydatalen);
1308 return -1;
1309 }
1310 keydatalen -= 8; /* AES-WRAP adds 8 bytes */
1311 buf = os_malloc(keydatalen);
1312 if (buf == NULL) {
1313 wpa_printf(MSG_WARNING, "WPA: No memory for "
1314 "AES-UNWRAP buffer");
1315 return -1;
1316 }
1317 if (aes_unwrap(sm->ptk.kek, keydatalen / 8,
1318 (u8 *) (key + 1), buf)) {
1319 os_free(buf);
1320 wpa_printf(MSG_WARNING, "WPA: AES unwrap failed - "
1321 "could not decrypt EAPOL-Key key data");
1322 return -1;
1323 }
1324 os_memcpy(key + 1, buf, keydatalen);
1325 os_free(buf);
1326 WPA_PUT_BE16(key->key_data_length, keydatalen);
1327 } else {
1328 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
1329 ver);
1330 return -1;
1331 }
1332 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1333 (u8 *) (key + 1), keydatalen);
1334 return 0;
1335}
1336
1337
1338/**
1339 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1340 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1341 */
1342void wpa_sm_aborted_cached(struct wpa_sm *sm)
1343{
1344 if (sm && sm->cur_pmksa) {
1345 wpa_printf(MSG_DEBUG, "RSN: Cancelling PMKSA caching attempt");
1346 sm->cur_pmksa = NULL;
1347 }
1348}
1349
1350
1351static void wpa_eapol_key_dump(const struct wpa_eapol_key *key)
1352{
1353#ifndef CONFIG_NO_STDOUT_DEBUG
1354 u16 key_info = WPA_GET_BE16(key->key_info);
1355
1356 wpa_printf(MSG_DEBUG, " EAPOL-Key type=%d", key->type);
1357 wpa_printf(MSG_DEBUG, " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s"
1358 "%s%s%s%s%s%s%s)",
1359 key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1360 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1361 WPA_KEY_INFO_KEY_INDEX_SHIFT,
1362 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1363 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1364 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1365 key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1366 key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1367 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1368 key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1369 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1370 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1371 wpa_printf(MSG_DEBUG, " key_length=%u key_data_length=%u",
1372 WPA_GET_BE16(key->key_length),
1373 WPA_GET_BE16(key->key_data_length));
1374 wpa_hexdump(MSG_DEBUG, " replay_counter",
1375 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1376 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN);
1377 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16);
1378 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8);
1379 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8);
1380 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16);
1381#endif /* CONFIG_NO_STDOUT_DEBUG */
1382}
1383
1384
1385/**
1386 * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1387 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1388 * @src_addr: Source MAC address of the EAPOL packet
1389 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1390 * @len: Length of the EAPOL frame
1391 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1392 *
1393 * This function is called for each received EAPOL frame. Other than EAPOL-Key
1394 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1395 * only processing WPA and WPA2 EAPOL-Key frames.
1396 *
1397 * The received EAPOL-Key packets are validated and valid packets are replied
1398 * to. In addition, key material (PTK, GTK) is configured at the end of a
1399 * successful key handshake.
1400 */
1401int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1402 const u8 *buf, size_t len)
1403{
1404 size_t plen, data_len, extra_len;
1405 struct ieee802_1x_hdr *hdr;
1406 struct wpa_eapol_key *key;
1407 u16 key_info, ver;
1408 u8 *tmp;
1409 int ret = -1;
1410 struct wpa_peerkey *peerkey = NULL;
1411
1412#ifdef CONFIG_IEEE80211R
1413 sm->ft_completed = 0;
1414#endif /* CONFIG_IEEE80211R */
1415
1416 if (len < sizeof(*hdr) + sizeof(*key)) {
1417 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame too short to be a WPA "
1418 "EAPOL-Key (len %lu, expecting at least %lu)",
1419 (unsigned long) len,
1420 (unsigned long) sizeof(*hdr) + sizeof(*key));
1421 return 0;
1422 }
1423
1424 tmp = os_malloc(len);
1425 if (tmp == NULL)
1426 return -1;
1427 os_memcpy(tmp, buf, len);
1428
1429 hdr = (struct ieee802_1x_hdr *) tmp;
1430 key = (struct wpa_eapol_key *) (hdr + 1);
1431 plen = be_to_host16(hdr->length);
1432 data_len = plen + sizeof(*hdr);
1433 wpa_printf(MSG_DEBUG, "IEEE 802.1X RX: version=%d type=%d length=%lu",
1434 hdr->version, hdr->type, (unsigned long) plen);
1435
1436 if (hdr->version < EAPOL_VERSION) {
1437 /* TODO: backwards compatibility */
1438 }
1439 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1440 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame (type %u) discarded, "
1441 "not a Key frame", hdr->type);
1442 ret = 0;
1443 goto out;
1444 }
1445 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
1446 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame payload size %lu "
1447 "invalid (frame size %lu)",
1448 (unsigned long) plen, (unsigned long) len);
1449 ret = 0;
1450 goto out;
1451 }
1452
1453 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1454 {
1455 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key type (%d) unknown, "
1456 "discarded", key->type);
1457 ret = 0;
1458 goto out;
1459 }
1460 wpa_eapol_key_dump(key);
1461
1462 eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1463 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len);
1464 if (data_len < len) {
1465 wpa_printf(MSG_DEBUG, "WPA: ignoring %lu bytes after the IEEE "
1466 "802.1X data", (unsigned long) len - data_len);
1467 }
1468 key_info = WPA_GET_BE16(key->key_info);
1469 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1470 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1471#ifdef CONFIG_IEEE80211R
1472 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1473#endif /* CONFIG_IEEE80211R */
1474 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1475 wpa_printf(MSG_INFO, "WPA: Unsupported EAPOL-Key descriptor "
1476 "version %d.", ver);
1477 goto out;
1478 }
1479
1480#ifdef CONFIG_IEEE80211R
56586197 1481 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
6fc6879b
JM		 1482 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
1483 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1484 wpa_printf(MSG_INFO, "FT: AP did not use "
1485 "AES-128-CMAC.");
1486 goto out;
1487 }
1488 } else
1489#endif /* CONFIG_IEEE80211R */
56586197
JM		 1490#ifdef CONFIG_IEEE80211W
1491 if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
1492 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1493 wpa_printf(MSG_INFO, "WPA: AP did not use the "
1494 "negotiated AES-128-CMAC.");
1495 goto out;
1496 }
1497 } else
1498#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 1499 if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
1500 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1501 wpa_printf(MSG_INFO, "WPA: CCMP is used, but EAPOL-Key "
1502 "descriptor version (%d) is not 2.", ver);
1503 if (sm->group_cipher != WPA_CIPHER_CCMP &&
1504 !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1505 /* Earlier versions of IEEE 802.11i did not explicitly
1506 * require version 2 descriptor for all EAPOL-Key
1507 * packets, so allow group keys to use version 1 if
1508 * CCMP is not used for them. */
1509 wpa_printf(MSG_INFO, "WPA: Backwards compatibility: "
1510 "allow invalid version for non-CCMP group "
1511 "keys");
1512 } else
1513 goto out;
1514 }
1515
1516#ifdef CONFIG_PEERKEY
1517 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
1518 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
1519 break;
1520 }
1521
1522 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
1523 if (!peerkey->initiator && peerkey->replay_counter_set &&
1524 os_memcmp(key->replay_counter, peerkey->replay_counter,
1525 WPA_REPLAY_COUNTER_LEN) <= 0) {
1526 wpa_printf(MSG_WARNING, "RSN: EAPOL-Key Replay "
1527 "Counter did not increase (STK) - dropping "
1528 "packet");
1529 goto out;
1530 } else if (peerkey->initiator) {
1531 u8 _tmp[WPA_REPLAY_COUNTER_LEN];
1532 os_memcpy(_tmp, key->replay_counter,
1533 WPA_REPLAY_COUNTER_LEN);
1534 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
1535 if (os_memcmp(_tmp, peerkey->replay_counter,
1536 WPA_REPLAY_COUNTER_LEN) != 0) {
1537 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key Replay "
1538 "Counter did not match (STK) - "
1539 "dropping packet");
1540 goto out;
1541 }
1542 }
1543 }
1544
1545 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
1546 wpa_printf(MSG_INFO, "RSN: Ack bit in key_info from STK peer");
1547 goto out;
1548 }
1549#endif /* CONFIG_PEERKEY */
1550
1551 if (!peerkey && sm->rx_replay_counter_set &&
1552 os_memcmp(key->replay_counter, sm->rx_replay_counter,
1553 WPA_REPLAY_COUNTER_LEN) <= 0) {
1554 wpa_printf(MSG_WARNING, "WPA: EAPOL-Key Replay Counter did not"
1555 " increase - dropping packet");
1556 goto out;
1557 }
1558
1559 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
1560#ifdef CONFIG_PEERKEY
1561 && (peerkey == NULL || !peerkey->initiator)
1562#endif /* CONFIG_PEERKEY */
1563 ) {
1564 wpa_printf(MSG_INFO, "WPA: No Ack bit in key_info");
1565 goto out;
1566 }
1567
1568 if (key_info & WPA_KEY_INFO_REQUEST) {
1569 wpa_printf(MSG_INFO, "WPA: EAPOL-Key with Request bit - "
1570 "dropped");
1571 goto out;
1572 }
1573
1574 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
1575 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
1576 goto out;
1577
1578#ifdef CONFIG_PEERKEY
1579 if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
1580 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len))
1581 goto out;
1582#endif /* CONFIG_PEERKEY */
1583
1584 extra_len = data_len - sizeof(*hdr) - sizeof(*key);
1585
1586 if (WPA_GET_BE16(key->key_data_length) > extra_len) {
1587 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1588 "frame - key_data overflow (%d > %lu)",
1589 WPA_GET_BE16(key->key_data_length),
1590 (unsigned long) extra_len);
1591 goto out;
1592 }
1593 extra_len = WPA_GET_BE16(key->key_data_length);
1594
1595 if (sm->proto == WPA_PROTO_RSN &&
1596 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1597 if (wpa_supplicant_decrypt_key_data(sm, key, ver))
1598 goto out;
1599 extra_len = WPA_GET_BE16(key->key_data_length);
1600 }
1601
1602 if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1603 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
1604 wpa_printf(MSG_WARNING, "WPA: Ignored EAPOL-Key "
1605 "(Pairwise) with non-zero key index");
1606 goto out;
1607 }
1608 if (peerkey) {
1609 /* PeerKey 4-Way Handshake */
1610 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver);
1611 } else if (key_info & WPA_KEY_INFO_MIC) {
1612 /* 3/4 4-Way Handshake */
1613 wpa_supplicant_process_3_of_4(sm, key, ver);
1614 } else {
1615 /* 1/4 4-Way Handshake */
1616 wpa_supplicant_process_1_of_4(sm, src_addr, key,
1617 ver);
1618 }
1619 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1620 /* PeerKey SMK Handshake */
1621 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info,
1622 ver);
1623 } else {
1624 if (key_info & WPA_KEY_INFO_MIC) {
1625 /* 1/2 Group Key Handshake */
1626 wpa_supplicant_process_1_of_2(sm, src_addr, key,
1627 extra_len, ver);
1628 } else {
1629 wpa_printf(MSG_WARNING, "WPA: EAPOL-Key (Group) "
1630 "without Mic bit - dropped");
1631 }
1632 }
1633
1634 ret = 1;
1635
1636out:
1637 os_free(tmp);
1638 return ret;
1639}
1640
1641
1642#ifdef CONFIG_CTRL_IFACE
1643static int wpa_cipher_bits(int cipher)
1644{
1645 switch (cipher) {
1646 case WPA_CIPHER_CCMP:
1647 return 128;
1648 case WPA_CIPHER_TKIP:
1649 return 256;
1650 case WPA_CIPHER_WEP104:
1651 return 104;
1652 case WPA_CIPHER_WEP40:
1653 return 40;
1654 default:
1655 return 0;
1656 }
1657}
1658
1659
1660static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
1661{
1662 switch (sm->key_mgmt) {
1663 case WPA_KEY_MGMT_IEEE8021X:
1664 return (sm->proto == WPA_PROTO_RSN ?
1665 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
1666 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
1667 case WPA_KEY_MGMT_PSK:
1668 return (sm->proto == WPA_PROTO_RSN ?
1669 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
1670 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
1671#ifdef CONFIG_IEEE80211R
1672 case WPA_KEY_MGMT_FT_IEEE8021X:
1673 return RSN_AUTH_KEY_MGMT_FT_802_1X;
1674 case WPA_KEY_MGMT_FT_PSK:
1675 return RSN_AUTH_KEY_MGMT_FT_PSK;
1676#endif /* CONFIG_IEEE80211R */
56586197
JM		 1677#ifdef CONFIG_IEEE80211W
1678 case WPA_KEY_MGMT_IEEE8021X_SHA256:
1679 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
1680 case WPA_KEY_MGMT_PSK_SHA256:
1681 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
1682#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 1683 case WPA_KEY_MGMT_WPA_NONE:
1684 return WPA_AUTH_KEY_MGMT_NONE;
1685 default:
1686 return 0;
1687 }
1688}
1689
1690
1691static u32 wpa_cipher_suite(struct wpa_sm *sm, int cipher)
1692{
1693 switch (cipher) {
1694 case WPA_CIPHER_CCMP:
1695 return (sm->proto == WPA_PROTO_RSN ?
1696 RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP);
1697 case WPA_CIPHER_TKIP:
1698 return (sm->proto == WPA_PROTO_RSN ?
1699 RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP);
1700 case WPA_CIPHER_WEP104:
1701 return (sm->proto == WPA_PROTO_RSN ?
1702 RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104);
1703 case WPA_CIPHER_WEP40:
1704 return (sm->proto == WPA_PROTO_RSN ?
1705 RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40);
1706 case WPA_CIPHER_NONE:
1707 return (sm->proto == WPA_PROTO_RSN ?
1708 RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE);
1709 default:
1710 return 0;
1711 }
1712}
1713
1714
1715#define RSN_SUITE "%02x-%02x-%02x-%d"
1716#define RSN_SUITE_ARG(s) \
1717((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
1718
1719/**
1720 * wpa_sm_get_mib - Dump text list of MIB entries
1721 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1722 * @buf: Buffer for the list
1723 * @buflen: Length of the buffer
1724 * Returns: Number of bytes written to buffer
1725 *
1726 * This function is used fetch dot11 MIB variables.
1727 */
1728int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
1729{
1730 char pmkid_txt[PMKID_LEN * 2 + 1];
1731 int rsna, ret;
1732 size_t len;
1733
1734 if (sm->cur_pmksa) {
1735 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
1736 sm->cur_pmksa->pmkid, PMKID_LEN);
1737 } else
1738 pmkid_txt[0] = '\0';
1739
56586197
JM		 1740 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
1741 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
6fc6879b
JM		 1742 sm->proto == WPA_PROTO_RSN)
1743 rsna = 1;
1744 else
1745 rsna = 0;
1746
1747 ret = os_snprintf(buf, buflen,
1748 "dot11RSNAOptionImplemented=TRUE\n"
1749 "dot11RSNAPreauthenticationImplemented=TRUE\n"
1750 "dot11RSNAEnabled=%s\n"
1751 "dot11RSNAPreauthenticationEnabled=%s\n"
1752 "dot11RSNAConfigVersion=%d\n"
1753 "dot11RSNAConfigPairwiseKeysSupported=5\n"
1754 "dot11RSNAConfigGroupCipherSize=%d\n"
1755 "dot11RSNAConfigPMKLifetime=%d\n"
1756 "dot11RSNAConfigPMKReauthThreshold=%d\n"
1757 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
1758 "dot11RSNAConfigSATimeout=%d\n",
1759 rsna ? "TRUE" : "FALSE",
1760 rsna ? "TRUE" : "FALSE",
1761 RSN_VERSION,
1762 wpa_cipher_bits(sm->group_cipher),
1763 sm->dot11RSNAConfigPMKLifetime,
1764 sm->dot11RSNAConfigPMKReauthThreshold,
1765 sm->dot11RSNAConfigSATimeout);
1766 if (ret < 0 || (size_t) ret >= buflen)
1767 return 0;
1768 len = ret;
1769
1770 ret = os_snprintf(
1771 buf + len, buflen - len,
1772 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
1773 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
1774 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
1775 "dot11RSNAPMKIDUsed=%s\n"
1776 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
1777 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
1778 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
1779 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
1780 "dot11RSNA4WayHandshakeFailures=%u\n",
1781 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1782 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)),
1783 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)),
1784 pmkid_txt,
1785 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1786 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)),
1787 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)),
1788 sm->dot11RSNA4WayHandshakeFailures);
1789 if (ret >= 0 && (size_t) ret < buflen)
1790 len += ret;
1791
1792 return (int) len;
1793}
1794#endif /* CONFIG_CTRL_IFACE */
1795
1796
1797static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
1798 void *ctx, int replace)
1799{
1800 struct wpa_sm *sm = ctx;
1801
1802 if (sm->cur_pmksa == entry ||
1803 (sm->pmk_len == entry->pmk_len &&
1804 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
1805 wpa_printf(MSG_DEBUG, "RSN: removed current PMKSA entry");
1806 sm->cur_pmksa = NULL;
1807
1808 if (replace) {
1809 /* A new entry is being added, so no need to
1810 * deauthenticate in this case. This happens when EAP
1811 * authentication is completed again (reauth or failed
1812 * PMKSA caching attempt). */
1813 return;
1814 }
1815
1816 os_memset(sm->pmk, 0, sizeof(sm->pmk));
1817 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
6fc6879b
JM		 1818 }
1819}
1820
1821
1822/**
1823 * wpa_sm_init - Initialize WPA state machine
1824 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
1825 * Returns: Pointer to the allocated WPA state machine data
1826 *
1827 * This function is used to allocate a new WPA state machine and the returned
1828 * value is passed to all WPA state machine calls.
1829 */
1830struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
1831{
1832 struct wpa_sm *sm;
1833
1834 sm = os_zalloc(sizeof(*sm));
1835 if (sm == NULL)
1836 return NULL;
1837 sm->renew_snonce = 1;
1838 sm->ctx = ctx;
1839
1840 sm->dot11RSNAConfigPMKLifetime = 43200;
1841 sm->dot11RSNAConfigPMKReauthThreshold = 70;
1842 sm->dot11RSNAConfigSATimeout = 60;
1843
1844 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
1845 if (sm->pmksa == NULL) {
1846 wpa_printf(MSG_ERROR, "RSN: PMKSA cache initialization "
1847 "failed");
1848 os_free(sm);
1849 return NULL;
1850 }
1851
1852 return sm;
1853}
1854
1855
1856/**
1857 * wpa_sm_deinit - Deinitialize WPA state machine
1858 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1859 */
1860void wpa_sm_deinit(struct wpa_sm *sm)
1861{
1862 if (sm == NULL)
1863 return;
1864 pmksa_cache_deinit(sm->pmksa);
1865 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
581a8cde 1866 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
6fc6879b
JM		 1867 os_free(sm->assoc_wpa_ie);
1868 os_free(sm->ap_wpa_ie);
1869 os_free(sm->ap_rsn_ie);
1870 os_free(sm->ctx);
1871 peerkey_deinit(sm);
1872 os_free(sm);
1873}
1874
1875
1876/**
1877 * wpa_sm_notify_assoc - Notify WPA state machine about association
1878 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1879 * @bssid: The BSSID of the new association
1880 *
1881 * This function is called to let WPA state machine know that the connection
1882 * was established.
1883 */
1884void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
1885{
58a98fb0
JM		 1886 int clear_ptk = 1;
1887
6fc6879b
JM		 1888 if (sm == NULL)
1889 return;
1890
1891 wpa_printf(MSG_DEBUG, "WPA: Association event - clear replay counter");
1892 os_memcpy(sm->bssid, bssid, ETH_ALEN);
1893 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
1894 sm->rx_replay_counter_set = 0;
1895 sm->renew_snonce = 1;
1896 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
1897 rsn_preauth_deinit(sm);
1898
1899#ifdef CONFIG_IEEE80211R
58a98fb0 1900 if (wpa_ft_is_completed(sm)) {
6fc6879b
JM		 1901 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
1902
1903 /* Prepare for the next transition */
1904 wpa_ft_prepare_auth_request(sm);
58a98fb0
JM		 1905
1906 clear_ptk = 0;
6fc6879b
JM		 1907 }
1908#endif /* CONFIG_IEEE80211R */
58a98fb0
JM		 1909
1910 if (clear_ptk) {
1911 /*
1912 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
1913 * this is not part of a Fast BSS Transition.
1914 */
1915 wpa_printf(MSG_DEBUG, "WPA: Clear old PTK");
1916 sm->ptk_set = 0;
1917 sm->tptk_set = 0;
1918 }
6fc6879b
JM		 1919}
1920
1921
1922/**
1923 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
1924 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1925 *
1926 * This function is called to let WPA state machine know that the connection
1927 * was lost. This will abort any existing pre-authentication session.
1928 */
1929void wpa_sm_notify_disassoc(struct wpa_sm *sm)
1930{
1931 rsn_preauth_deinit(sm);
1932 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
1933 sm->dot11RSNA4WayHandshakeFailures++;
1934}
1935
1936
1937/**
1938 * wpa_sm_set_pmk - Set PMK
1939 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1940 * @pmk: The new PMK
1941 * @pmk_len: The length of the new PMK in bytes
1942 *
1943 * Configure the PMK for WPA state machine.
1944 */
1945void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len)
1946{
1947 if (sm == NULL)
1948 return;
1949
1950 sm->pmk_len = pmk_len;
1951 os_memcpy(sm->pmk, pmk, pmk_len);
1952
1953#ifdef CONFIG_IEEE80211R
1954 /* Set XXKey to be PSK for FT key derivation */
1955 sm->xxkey_len = pmk_len;
1956 os_memcpy(sm->xxkey, pmk, pmk_len);
1957#endif /* CONFIG_IEEE80211R */
1958}
1959
1960
1961/**
1962 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
1963 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1964 *
1965 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
1966 * will be cleared.
1967 */
1968void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
1969{
1970 if (sm == NULL)
1971 return;
1972
1973 if (sm->cur_pmksa) {
1974 sm->pmk_len = sm->cur_pmksa->pmk_len;
1975 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
1976 } else {
1977 sm->pmk_len = PMK_LEN;
1978 os_memset(sm->pmk, 0, PMK_LEN);
1979 }
1980}
1981
1982
1983/**
1984 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
1985 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1986 * @fast_reauth: Whether fast reauthentication (EAP) is allowed
1987 */
1988void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
1989{
1990 if (sm)
1991 sm->fast_reauth = fast_reauth;
1992}
1993
1994
1995/**
1996 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
1997 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1998 * @scard_ctx: Context pointer for smartcard related callback functions
1999 */
2000void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
2001{
2002 if (sm == NULL)
2003 return;
2004 sm->scard_ctx = scard_ctx;
2005 if (sm->preauth_eapol)
2006 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
2007}
2008
2009
2010/**
2011 * wpa_sm_set_config - Notification of current configration change
2012 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2013 * @config: Pointer to current network configuration
2014 *
2015 * Notify WPA state machine that configuration has changed. config will be
2016 * stored as a backpointer to network configuration. This can be %NULL to clear
2017 * the stored pointed.
2018 */
2019void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
2020{
2021 if (!sm)
2022 return;
2023
6fc6879b 2024 if (config) {
886a807f 2025 sm->network_ctx = config->network_ctx;
6fc6879b
JM		 2026 sm->peerkey_enabled = config->peerkey_enabled;
2027 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2028 sm->proactive_key_caching = config->proactive_key_caching;
2029 sm->eap_workaround = config->eap_workaround;
2030 sm->eap_conf_ctx = config->eap_conf_ctx;
2031 if (config->ssid) {
2032 os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2033 sm->ssid_len = config->ssid_len;
2034 } else
2035 sm->ssid_len = 0;
581a8cde 2036 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
6fc6879b 2037 } else {
886a807f 2038 sm->network_ctx = NULL;
6fc6879b
JM		 2039 sm->peerkey_enabled = 0;
2040 sm->allowed_pairwise_cipher = 0;
2041 sm->proactive_key_caching = 0;
2042 sm->eap_workaround = 0;
2043 sm->eap_conf_ctx = NULL;
2044 sm->ssid_len = 0;
581a8cde 2045 sm->wpa_ptk_rekey = 0;
6fc6879b 2046 }
3ff77e07
JM		 2047 if (config == NULL || config->network_ctx != sm->network_ctx)
2048 pmksa_cache_notify_reconfig(sm->pmksa);
6fc6879b
JM		 2049}
2050
2051
2052/**
2053 * wpa_sm_set_own_addr - Set own MAC address
2054 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2055 * @addr: Own MAC address
2056 */
2057void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2058{
2059 if (sm)
2060 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2061}
2062
2063
2064/**
2065 * wpa_sm_set_ifname - Set network interface name
2066 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2067 * @ifname: Interface name
2068 * @bridge_ifname: Optional bridge interface name (for pre-auth)
2069 */
2070void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2071 const char *bridge_ifname)
2072{
2073 if (sm) {
2074 sm->ifname = ifname;
2075 sm->bridge_ifname = bridge_ifname;
2076 }
2077}
2078
2079
2080/**
2081 * wpa_sm_set_eapol - Set EAPOL state machine pointer
2082 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2083 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2084 */
2085void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2086{
2087 if (sm)
2088 sm->eapol = eapol;
2089}
2090
2091
2092/**
2093 * wpa_sm_set_param - Set WPA state machine parameters
2094 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2095 * @param: Parameter field
2096 * @value: Parameter value
2097 * Returns: 0 on success, -1 on failure
2098 */
2099int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2100 unsigned int value)
2101{
2102 int ret = 0;
2103
2104 if (sm == NULL)
2105 return -1;
2106
2107 switch (param) {
2108 case RSNA_PMK_LIFETIME:
2109 if (value > 0)
2110 sm->dot11RSNAConfigPMKLifetime = value;
2111 else
2112 ret = -1;
2113 break;
2114 case RSNA_PMK_REAUTH_THRESHOLD:
2115 if (value > 0 && value <= 100)
2116 sm->dot11RSNAConfigPMKReauthThreshold = value;
2117 else
2118 ret = -1;
2119 break;
2120 case RSNA_SA_TIMEOUT:
2121 if (value > 0)
2122 sm->dot11RSNAConfigSATimeout = value;
2123 else
2124 ret = -1;
2125 break;
2126 case WPA_PARAM_PROTO:
2127 sm->proto = value;
2128 break;
2129 case WPA_PARAM_PAIRWISE:
2130 sm->pairwise_cipher = value;
2131 break;
2132 case WPA_PARAM_GROUP:
2133 sm->group_cipher = value;
2134 break;
2135 case WPA_PARAM_KEY_MGMT:
2136 sm->key_mgmt = value;
2137 break;
2138#ifdef CONFIG_IEEE80211W
2139 case WPA_PARAM_MGMT_GROUP:
2140 sm->mgmt_group_cipher = value;
2141 break;
2142#endif /* CONFIG_IEEE80211W */
2143 case WPA_PARAM_RSN_ENABLED:
2144 sm->rsn_enabled = value;
2145 break;
2146 default:
2147 break;
2148 }
2149
2150 return ret;
2151}
2152
2153
2154/**
2155 * wpa_sm_get_param - Get WPA state machine parameters
2156 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2157 * @param: Parameter field
2158 * Returns: Parameter value
2159 */
2160unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param)
2161{
2162 if (sm == NULL)
2163 return 0;
2164
2165 switch (param) {
2166 case RSNA_PMK_LIFETIME:
2167 return sm->dot11RSNAConfigPMKLifetime;
2168 case RSNA_PMK_REAUTH_THRESHOLD:
2169 return sm->dot11RSNAConfigPMKReauthThreshold;
2170 case RSNA_SA_TIMEOUT:
2171 return sm->dot11RSNAConfigSATimeout;
2172 case WPA_PARAM_PROTO:
2173 return sm->proto;
2174 case WPA_PARAM_PAIRWISE:
2175 return sm->pairwise_cipher;
2176 case WPA_PARAM_GROUP:
2177 return sm->group_cipher;
2178 case WPA_PARAM_KEY_MGMT:
2179 return sm->key_mgmt;
2180#ifdef CONFIG_IEEE80211W
2181 case WPA_PARAM_MGMT_GROUP:
2182 return sm->mgmt_group_cipher;
2183#endif /* CONFIG_IEEE80211W */
2184 case WPA_PARAM_RSN_ENABLED:
2185 return sm->rsn_enabled;
2186 default:
2187 return 0;
2188 }
2189}
2190
2191
2192/**
2193 * wpa_sm_get_status - Get WPA state machine
2194 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2195 * @buf: Buffer for status information
2196 * @buflen: Maximum buffer length
2197 * @verbose: Whether to include verbose status information
2198 * Returns: Number of bytes written to buf.
2199 *
2200 * Query WPA state machine for status information. This function fills in
2201 * a text area with current status information. If the buffer (buf) is not
2202 * large enough, status information will be truncated to fit the buffer.
2203 */
2204int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2205 int verbose)
2206{
2207 char *pos = buf, *end = buf + buflen;
2208 int ret;
2209
2210 ret = os_snprintf(pos, end - pos,
2211 "pairwise_cipher=%s\n"
2212 "group_cipher=%s\n"
2213 "key_mgmt=%s\n",
2214 wpa_cipher_txt(sm->pairwise_cipher),
2215 wpa_cipher_txt(sm->group_cipher),
2216 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2217 if (ret < 0 || ret >= end - pos)
2218 return pos - buf;
2219 pos += ret;
2220 return pos - buf;
2221}
2222
2223
2224/**
2225 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2226 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2227 * @wpa_ie: Pointer to buffer for WPA/RSN IE
2228 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2229 * Returns: 0 on success, -1 on failure
2230 */
2231int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2232 size_t *wpa_ie_len)
2233{
2234 int res;
2235
2236 if (sm == NULL)
2237 return -1;
2238
2239 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2240 if (res < 0)
2241 return -1;
2242 *wpa_ie_len = res;
2243
2244 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2245 wpa_ie, *wpa_ie_len);
2246
2247 if (sm->assoc_wpa_ie == NULL) {
2248 /*
2249 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2250 * the correct version of the IE even if PMKSA caching is
2251 * aborted (which would remove PMKID from IE generation).
2252 */
2253 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2254 if (sm->assoc_wpa_ie == NULL)
2255 return -1;
2256
2257 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2258 sm->assoc_wpa_ie_len = *wpa_ie_len;
2259 }
2260
2261 return 0;
2262}
2263
2264
2265/**
2266 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2267 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2268 * @ie: Pointer to IE data (starting from id)
2269 * @len: IE length
2270 * Returns: 0 on success, -1 on failure
2271 *
2272 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2273 * Request frame. The IE will be used to override the default value generated
2274 * with wpa_sm_set_assoc_wpa_ie_default().
2275 */
2276int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2277{
2278 if (sm == NULL)
2279 return -1;
2280
2281 os_free(sm->assoc_wpa_ie);
2282 if (ie == NULL || len == 0) {
2283 wpa_printf(MSG_DEBUG, "WPA: clearing own WPA/RSN IE");
2284 sm->assoc_wpa_ie = NULL;
2285 sm->assoc_wpa_ie_len = 0;
2286 } else {
2287 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2288 sm->assoc_wpa_ie = os_malloc(len);
2289 if (sm->assoc_wpa_ie == NULL)
2290 return -1;
2291
2292 os_memcpy(sm->assoc_wpa_ie, ie, len);
2293 sm->assoc_wpa_ie_len = len;
2294 }
2295
2296 return 0;
2297}
2298
2299
2300/**
2301 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2302 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2303 * @ie: Pointer to IE data (starting from id)
2304 * @len: IE length
2305 * Returns: 0 on success, -1 on failure
2306 *
2307 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2308 * frame.
2309 */
2310int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2311{
2312 if (sm == NULL)
2313 return -1;
2314
2315 os_free(sm->ap_wpa_ie);
2316 if (ie == NULL || len == 0) {
2317 wpa_printf(MSG_DEBUG, "WPA: clearing AP WPA IE");
2318 sm->ap_wpa_ie = NULL;
2319 sm->ap_wpa_ie_len = 0;
2320 } else {
2321 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2322 sm->ap_wpa_ie = os_malloc(len);
2323 if (sm->ap_wpa_ie == NULL)
2324 return -1;
2325
2326 os_memcpy(sm->ap_wpa_ie, ie, len);
2327 sm->ap_wpa_ie_len = len;
2328 }
2329
2330 return 0;
2331}
2332
2333
2334/**
2335 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
2336 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2337 * @ie: Pointer to IE data (starting from id)
2338 * @len: IE length
2339 * Returns: 0 on success, -1 on failure
2340 *
2341 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response
2342 * frame.
2343 */
2344int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2345{
2346 if (sm == NULL)
2347 return -1;
2348
2349 os_free(sm->ap_rsn_ie);
2350 if (ie == NULL || len == 0) {
2351 wpa_printf(MSG_DEBUG, "WPA: clearing AP RSN IE");
2352 sm->ap_rsn_ie = NULL;
2353 sm->ap_rsn_ie_len = 0;
2354 } else {
2355 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2356 sm->ap_rsn_ie = os_malloc(len);
2357 if (sm->ap_rsn_ie == NULL)
2358 return -1;
2359
2360 os_memcpy(sm->ap_rsn_ie, ie, len);
2361 sm->ap_rsn_ie_len = len;
2362 }
2363
2364 return 0;
2365}
2366
2367
2368/**
2369 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
2370 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2371 * @data: Pointer to data area for parsing results
2372 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
2373 *
2374 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
2375 * parsed data into data.
2376 */
2377int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
2378{
2379 if (sm == NULL || sm->assoc_wpa_ie == NULL) {
2380 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE available from "
2381 "association info");
2382 return -1;
2383 }
2384 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
2385 return -2;
2386 return 0;
2387}
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