1 /*
2 * WPA Supplicant - WPA state machine and EAPOL-Key processing
3 * Copyright (c) 2003-2015, Jouni Malinen <j@w1.fi>
4 * Copyright(c) 2015 Intel Deutschland GmbH
5 *
6 * This software may be distributed under the terms of the BSD license.
7 * See README for more details.
8 */
9
10 #include "includes.h"
11
12 #include "common.h"
13 #include "crypto/aes.h"
14 #include "crypto/aes_wrap.h"
15 #include "crypto/crypto.h"
16 #include "crypto/random.h"
17 #include "crypto/aes_siv.h"
18 #include "common/ieee802_11_defs.h"
19 #include "common/ieee802_11_common.h"
20 #include "eap_common/eap_defs.h"
21 #include "eapol_supp/eapol_supp_sm.h"
22 #include "wpa.h"
23 #include "eloop.h"
24 #include "preauth.h"
25 #include "pmksa_cache.h"
26 #include "wpa_i.h"
27 #include "wpa_ie.h"
28 #include "peerkey.h"
29
30
31 static const u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
32
33
34 /**
35 * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message
36 * @sm: Pointer to WPA state machine data from wpa_sm_init()
37 * @ptk: PTK for Key Confirmation/Encryption Key
38 * @ver: Version field from Key Info
39 * @dest: Destination address for the frame
40 * @proto: Ethertype (usually ETH_P_EAPOL)
41 * @msg: EAPOL-Key message
42 * @msg_len: Length of message
43 * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written
44 * Returns: >= 0 on success, < 0 on failure
45 */
wpa_eapol_key_send(struct wpa_sm * sm,struct wpa_ptk * ptk,int ver,const u8 * dest,u16 proto,u8 * msg,size_t msg_len,u8 * key_mic)46 int wpa_eapol_key_send(struct wpa_sm *sm, struct wpa_ptk *ptk,
47 int ver, const u8 *dest, u16 proto,
48 u8 *msg, size_t msg_len, u8 *key_mic)
49 {
50 int ret = -1;
51 size_t mic_len = wpa_mic_len(sm->key_mgmt);
52
53 if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) {
54 /*
55 * Association event was not yet received; try to fetch
56 * BSSID from the driver.
57 */
58 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) {
59 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
60 "WPA: Failed to read BSSID for "
61 "EAPOL-Key destination address");
62 } else {
63 dest = sm->bssid;
64 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
65 "WPA: Use BSSID (" MACSTR
66 ") as the destination for EAPOL-Key",
67 MAC2STR(dest));
68 }
69 }
70
71 if (mic_len) {
72 if (key_mic && (!ptk || !ptk->kck_len))
73 goto out;
74
75 if (key_mic &&
76 wpa_eapol_key_mic(ptk->kck, ptk->kck_len, sm->key_mgmt, ver,
77 msg, msg_len, key_mic)) {
78 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
79 "WPA: Failed to generate EAPOL-Key version %d key_mgmt 0x%x MIC",
80 ver, sm->key_mgmt);
81 goto out;
82 }
83 if (ptk)
84 wpa_hexdump_key(MSG_DEBUG, "WPA: KCK",
85 ptk->kck, ptk->kck_len);
86 wpa_hexdump(MSG_DEBUG, "WPA: Derived Key MIC",
87 key_mic, mic_len);
88 } else {
89 #ifdef CONFIG_FILS
90 /* AEAD cipher - Key MIC field not used */
91 struct ieee802_1x_hdr *s_hdr, *hdr;
92 struct wpa_eapol_key *s_key, *key;
93 u8 *buf, *s_key_data, *key_data;
94 size_t buf_len = msg_len + AES_BLOCK_SIZE;
95 size_t key_data_len;
96 u16 eapol_len;
97 const u8 *aad[1];
98 size_t aad_len[1];
99
100 if (!ptk || !ptk->kek_len)
101 goto out;
102
103 key_data_len = msg_len - sizeof(struct ieee802_1x_hdr) -
104 sizeof(struct wpa_eapol_key) - 2;
105
106 buf = os_malloc(buf_len);
107 if (!buf)
108 goto out;
109
110 os_memcpy(buf, msg, msg_len);
111 hdr = (struct ieee802_1x_hdr *) buf;
112 key = (struct wpa_eapol_key *) (hdr + 1);
113 key_data = ((u8 *) (key + 1)) + 2;
114
115 /* Update EAPOL header to include AES-SIV overhead */
116 eapol_len = be_to_host16(hdr->length);
117 eapol_len += AES_BLOCK_SIZE;
118 hdr->length = host_to_be16(eapol_len);
119
120 /* Update Key Data Length field to include AES-SIV overhead */
121 WPA_PUT_BE16((u8 *) (key + 1), AES_BLOCK_SIZE + key_data_len);
122
123 s_hdr = (struct ieee802_1x_hdr *) msg;
124 s_key = (struct wpa_eapol_key *) (s_hdr + 1);
125 s_key_data = ((u8 *) (s_key + 1)) + 2;
126
127 wpa_hexdump_key(MSG_DEBUG, "WPA: Plaintext Key Data",
128 s_key_data, key_data_len);
129
130 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK", ptk->kek, ptk->kek_len);
131 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
132 * to Key Data (exclusive). */
133 aad[0] = buf;
134 aad_len[0] = key_data - buf;
135 if (aes_siv_encrypt(ptk->kek, ptk->kek_len,
136 s_key_data, key_data_len,
137 1, aad, aad_len, key_data) < 0) {
138 os_free(buf);
139 goto out;
140 }
141
142 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
143 key_data, AES_BLOCK_SIZE + key_data_len);
144
145 os_free(msg);
146 msg = buf;
147 msg_len = buf_len;
148 #else /* CONFIG_FILS */
149 goto out;
150 #endif /* CONFIG_FILS */
151 }
152
153 wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len);
154 ret = wpa_sm_ether_send(sm, dest, proto, msg, msg_len);
155 eapol_sm_notify_tx_eapol_key(sm->eapol);
156 out:
157 os_free(msg);
158 return ret;
159 }
160
161
162 /**
163 * wpa_sm_key_request - Send EAPOL-Key Request
164 * @sm: Pointer to WPA state machine data from wpa_sm_init()
165 * @error: Indicate whether this is an Michael MIC error report
166 * @pairwise: 1 = error report for pairwise packet, 0 = for group packet
167 *
168 * Send an EAPOL-Key Request to the current authenticator. This function is
169 * used to request rekeying and it is usually called when a local Michael MIC
170 * failure is detected.
171 */
wpa_sm_key_request(struct wpa_sm * sm,int error,int pairwise)172 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
173 {
174 size_t mic_len, hdrlen, rlen;
175 struct wpa_eapol_key *reply;
176 int key_info, ver;
177 u8 bssid[ETH_ALEN], *rbuf, *key_mic, *mic;
178
179 if (sm->key_mgmt == WPA_KEY_MGMT_OSEN ||
180 wpa_key_mgmt_suite_b(sm->key_mgmt))
181 ver = WPA_KEY_INFO_TYPE_AKM_DEFINED;
182 else if (wpa_key_mgmt_ft(sm->key_mgmt) ||
183 wpa_key_mgmt_sha256(sm->key_mgmt))
184 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
185 else if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
186 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
187 else
188 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
189
190 if (wpa_sm_get_bssid(sm, bssid) < 0) {
191 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
192 "Failed to read BSSID for EAPOL-Key request");
193 return;
194 }
195
196 mic_len = wpa_mic_len(sm->key_mgmt);
197 hdrlen = sizeof(*reply) + mic_len + 2;
198 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
199 hdrlen, &rlen, (void *) &reply);
200 if (rbuf == NULL)
201 return;
202
203 reply->type = (sm->proto == WPA_PROTO_RSN ||
204 sm->proto == WPA_PROTO_OSEN) ?
205 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
206 key_info = WPA_KEY_INFO_REQUEST | ver;
207 if (sm->ptk_set)
208 key_info |= WPA_KEY_INFO_SECURE;
209 if (sm->ptk_set && mic_len)
210 key_info |= WPA_KEY_INFO_MIC;
211 if (error)
212 key_info |= WPA_KEY_INFO_ERROR;
213 if (pairwise)
214 key_info |= WPA_KEY_INFO_KEY_TYPE;
215 WPA_PUT_BE16(reply->key_info, key_info);
216 WPA_PUT_BE16(reply->key_length, 0);
217 os_memcpy(reply->replay_counter, sm->request_counter,
218 WPA_REPLAY_COUNTER_LEN);
219 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
220
221 mic = (u8 *) (reply + 1);
222 WPA_PUT_BE16(mic + mic_len, 0);
223 if (!(key_info & WPA_KEY_INFO_MIC))
224 key_mic = NULL;
225 else
226 key_mic = mic;
227
228 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
229 "WPA: Sending EAPOL-Key Request (error=%d "
230 "pairwise=%d ptk_set=%d len=%lu)",
231 error, pairwise, sm->ptk_set, (unsigned long) rlen);
232 wpa_eapol_key_send(sm, &sm->ptk, ver, bssid, ETH_P_EAPOL, rbuf, rlen,
233 key_mic);
234 }
235
236
wpa_supplicant_key_mgmt_set_pmk(struct wpa_sm * sm)237 static void wpa_supplicant_key_mgmt_set_pmk(struct wpa_sm *sm)
238 {
239 #ifdef CONFIG_IEEE80211R
240 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
241 if (wpa_sm_key_mgmt_set_pmk(sm, sm->xxkey, sm->xxkey_len))
242 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
243 "RSN: Cannot set low order 256 bits of MSK for key management offload");
244 } else {
245 #endif /* CONFIG_IEEE80211R */
246 if (wpa_sm_key_mgmt_set_pmk(sm, sm->pmk, sm->pmk_len))
247 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
248 "RSN: Cannot set PMK for key management offload");
249 #ifdef CONFIG_IEEE80211R
250 }
251 #endif /* CONFIG_IEEE80211R */
252 }
253
254
wpa_supplicant_get_pmk(struct wpa_sm * sm,const unsigned char * src_addr,const u8 * pmkid)255 static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
256 const unsigned char *src_addr,
257 const u8 *pmkid)
258 {
259 int abort_cached = 0;
260
261 if (pmkid && !sm->cur_pmksa) {
262 /* When using drivers that generate RSN IE, wpa_supplicant may
263 * not have enough time to get the association information
264 * event before receiving this 1/4 message, so try to find a
265 * matching PMKSA cache entry here. */
266 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid,
267 NULL);
268 if (sm->cur_pmksa) {
269 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
270 "RSN: found matching PMKID from PMKSA cache");
271 } else {
272 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
273 "RSN: no matching PMKID found");
274 abort_cached = 1;
275 }
276 }
277
278 if (pmkid && sm->cur_pmksa &&
279 os_memcmp_const(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
280 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
281 wpa_sm_set_pmk_from_pmksa(sm);
282 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
283 sm->pmk, sm->pmk_len);
284 eapol_sm_notify_cached(sm->eapol);
285 #ifdef CONFIG_IEEE80211R
286 sm->xxkey_len = 0;
287 #endif /* CONFIG_IEEE80211R */
288 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
289 int res, pmk_len;
290
291 if (wpa_key_mgmt_sha384(sm->key_mgmt))
292 pmk_len = PMK_LEN_SUITE_B_192;
293 else
294 pmk_len = PMK_LEN;
295 res = eapol_sm_get_key(sm->eapol, sm->pmk, pmk_len);
296 if (res) {
297 if (pmk_len == PMK_LEN) {
298 /*
299 * EAP-LEAP is an exception from other EAP
300 * methods: it uses only 16-byte PMK.
301 */
302 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
303 pmk_len = 16;
304 }
305 } else {
306 #ifdef CONFIG_IEEE80211R
307 u8 buf[2 * PMK_LEN];
308 if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
309 {
310 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
311 sm->xxkey_len = PMK_LEN;
312 os_memset(buf, 0, sizeof(buf));
313 }
314 #endif /* CONFIG_IEEE80211R */
315 }
316 if (res == 0) {
317 struct rsn_pmksa_cache_entry *sa = NULL;
318 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
319 "machines", sm->pmk, pmk_len);
320 sm->pmk_len = pmk_len;
321 wpa_supplicant_key_mgmt_set_pmk(sm);
322 if (sm->proto == WPA_PROTO_RSN &&
323 !wpa_key_mgmt_suite_b(sm->key_mgmt) &&
324 !wpa_key_mgmt_ft(sm->key_mgmt)) {
325 sa = pmksa_cache_add(sm->pmksa,
326 sm->pmk, pmk_len, NULL,
327 NULL, 0,
328 src_addr, sm->own_addr,
329 sm->network_ctx,
330 sm->key_mgmt);
331 }
332 if (!sm->cur_pmksa && pmkid &&
333 pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL))
334 {
335 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
336 "RSN: the new PMK matches with the "
337 "PMKID");
338 abort_cached = 0;
339 } else if (sa && !sm->cur_pmksa && pmkid) {
340 /*
341 * It looks like the authentication server
342 * derived mismatching MSK. This should not
343 * really happen, but bugs happen.. There is not
344 * much we can do here without knowing what
345 * exactly caused the server to misbehave.
346 */
347 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
348 "RSN: PMKID mismatch - authentication server may have derived different MSK?!");
349 return -1;
350 }
351
352 if (!sm->cur_pmksa)
353 sm->cur_pmksa = sa;
354 } else {
355 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
356 "WPA: Failed to get master session key from "
357 "EAPOL state machines - key handshake "
358 "aborted");
359 if (sm->cur_pmksa) {
360 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
361 "RSN: Cancelled PMKSA caching "
362 "attempt");
363 sm->cur_pmksa = NULL;
364 abort_cached = 1;
365 } else if (!abort_cached) {
366 return -1;
367 }
368 }
369 }
370
371 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) &&
372 !wpa_key_mgmt_suite_b(sm->key_mgmt) &&
373 !wpa_key_mgmt_ft(sm->key_mgmt) && sm->key_mgmt != WPA_KEY_MGMT_OSEN)
374 {
375 /* Send EAPOL-Start to trigger full EAP authentication. */
376 u8 *buf;
377 size_t buflen;
378
379 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
380 "RSN: no PMKSA entry found - trigger "
381 "full EAP authentication");
382 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
383 NULL, 0, &buflen, NULL);
384 if (buf) {
385 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
386 buf, buflen);
387 os_free(buf);
388 return -2;
389 }
390
391 return -1;
392 }
393
394 return 0;
395 }
396
397
398 /**
399 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
400 * @sm: Pointer to WPA state machine data from wpa_sm_init()
401 * @dst: Destination address for the frame
402 * @key: Pointer to the EAPOL-Key frame header
403 * @ver: Version bits from EAPOL-Key Key Info
404 * @nonce: Nonce value for the EAPOL-Key frame
405 * @wpa_ie: WPA/RSN IE
406 * @wpa_ie_len: Length of the WPA/RSN IE
407 * @ptk: PTK to use for keyed hash and encryption
408 * Returns: >= 0 on success, < 0 on failure
409 */
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)410 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
411 const struct wpa_eapol_key *key,
412 int ver, const u8 *nonce,
413 const u8 *wpa_ie, size_t wpa_ie_len,
414 struct wpa_ptk *ptk)
415 {
416 size_t mic_len, hdrlen, rlen;
417 struct wpa_eapol_key *reply;
418 u8 *rbuf, *key_mic;
419 u8 *rsn_ie_buf = NULL;
420 u16 key_info;
421
422 if (wpa_ie == NULL) {
423 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No wpa_ie set - "
424 "cannot generate msg 2/4");
425 return -1;
426 }
427
428 #ifdef CONFIG_IEEE80211R
429 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
430 int res;
431
432 /*
433 * Add PMKR1Name into RSN IE (PMKID-List) and add MDIE and
434 * FTIE from (Re)Association Response.
435 */
436 rsn_ie_buf = os_malloc(wpa_ie_len + 2 + 2 + PMKID_LEN +
437 sm->assoc_resp_ies_len);
438 if (rsn_ie_buf == NULL)
439 return -1;
440 os_memcpy(rsn_ie_buf, wpa_ie, wpa_ie_len);
441 res = wpa_insert_pmkid(rsn_ie_buf, &wpa_ie_len,
442 sm->pmk_r1_name);
443 if (res < 0) {
444 os_free(rsn_ie_buf);
445 return -1;
446 }
447
448 if (sm->assoc_resp_ies) {
449 os_memcpy(rsn_ie_buf + wpa_ie_len, sm->assoc_resp_ies,
450 sm->assoc_resp_ies_len);
451 wpa_ie_len += sm->assoc_resp_ies_len;
452 }
453
454 wpa_ie = rsn_ie_buf;
455 }
456 #endif /* CONFIG_IEEE80211R */
457
458 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
459
460 mic_len = wpa_mic_len(sm->key_mgmt);
461 hdrlen = sizeof(*reply) + mic_len + 2;
462 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
463 NULL, hdrlen + wpa_ie_len,
464 &rlen, (void *) &reply);
465 if (rbuf == NULL) {
466 os_free(rsn_ie_buf);
467 return -1;
468 }
469
470 reply->type = (sm->proto == WPA_PROTO_RSN ||
471 sm->proto == WPA_PROTO_OSEN) ?
472 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
473 key_info = ver | WPA_KEY_INFO_KEY_TYPE;
474 if (mic_len)
475 key_info |= WPA_KEY_INFO_MIC;
476 else
477 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
478 WPA_PUT_BE16(reply->key_info, key_info);
479 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
480 WPA_PUT_BE16(reply->key_length, 0);
481 else
482 os_memcpy(reply->key_length, key->key_length, 2);
483 os_memcpy(reply->replay_counter, key->replay_counter,
484 WPA_REPLAY_COUNTER_LEN);
485 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter,
486 WPA_REPLAY_COUNTER_LEN);
487
488 key_mic = (u8 *) (reply + 1);
489 WPA_PUT_BE16(key_mic + mic_len, wpa_ie_len); /* Key Data Length */
490 os_memcpy(key_mic + mic_len + 2, wpa_ie, wpa_ie_len); /* Key Data */
491 os_free(rsn_ie_buf);
492
493 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
494
495 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
496 return wpa_eapol_key_send(sm, ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen,
497 key_mic);
498 }
499
500
wpa_derive_ptk(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)501 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
502 const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
503 {
504 #ifdef CONFIG_IEEE80211R
505 if (wpa_key_mgmt_ft(sm->key_mgmt))
506 return wpa_derive_ptk_ft(sm, src_addr, key, ptk);
507 #endif /* CONFIG_IEEE80211R */
508
509 return wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
510 sm->own_addr, sm->bssid, sm->snonce,
511 key->key_nonce, ptk, sm->key_mgmt,
512 sm->pairwise_cipher);
513 }
514
515
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)516 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
517 const unsigned char *src_addr,
518 const struct wpa_eapol_key *key,
519 u16 ver, const u8 *key_data,
520 size_t key_data_len)
521 {
522 struct wpa_eapol_ie_parse ie;
523 struct wpa_ptk *ptk;
524 int res;
525 u8 *kde, *kde_buf = NULL;
526 size_t kde_len;
527
528 if (wpa_sm_get_network_ctx(sm) == NULL) {
529 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No SSID info "
530 "found (msg 1 of 4)");
531 return;
532 }
533
534 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
535 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of 4-Way "
536 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
537
538 os_memset(&ie, 0, sizeof(ie));
539
540 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
541 /* RSN: msg 1/4 should contain PMKID for the selected PMK */
542 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data",
543 key_data, key_data_len);
544 if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
545 goto failed;
546 if (ie.pmkid) {
547 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
548 "Authenticator", ie.pmkid, PMKID_LEN);
549 }
550 }
551
552 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid);
553 if (res == -2) {
554 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to "
555 "msg 1/4 - requesting full EAP authentication");
556 return;
557 }
558 if (res)
559 goto failed;
560
561 if (sm->renew_snonce) {
562 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
563 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
564 "WPA: Failed to get random data for SNonce");
565 goto failed;
566 }
567 sm->renew_snonce = 0;
568 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
569 sm->snonce, WPA_NONCE_LEN);
570 }
571
572 /* Calculate PTK which will be stored as a temporary PTK until it has
573 * been verified when processing message 3/4. */
574 ptk = &sm->tptk;
575 wpa_derive_ptk(sm, src_addr, key, ptk);
576 if (sm->pairwise_cipher == WPA_CIPHER_TKIP) {
577 u8 buf[8];
578 /* Supplicant: swap tx/rx Mic keys */
579 os_memcpy(buf, &ptk->tk[16], 8);
580 os_memcpy(&ptk->tk[16], &ptk->tk[24], 8);
581 os_memcpy(&ptk->tk[24], buf, 8);
582 os_memset(buf, 0, sizeof(buf));
583 }
584 sm->tptk_set = 1;
585 sm->tk_to_set = 1;
586
587 kde = sm->assoc_wpa_ie;
588 kde_len = sm->assoc_wpa_ie_len;
589
590 #ifdef CONFIG_P2P
591 if (sm->p2p) {
592 kde_buf = os_malloc(kde_len + 2 + RSN_SELECTOR_LEN + 1);
593 if (kde_buf) {
594 u8 *pos;
595 wpa_printf(MSG_DEBUG, "P2P: Add IP Address Request KDE "
596 "into EAPOL-Key 2/4");
597 os_memcpy(kde_buf, kde, kde_len);
598 kde = kde_buf;
599 pos = kde + kde_len;
600 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
601 *pos++ = RSN_SELECTOR_LEN + 1;
602 RSN_SELECTOR_PUT(pos, WFA_KEY_DATA_IP_ADDR_REQ);
603 pos += RSN_SELECTOR_LEN;
604 *pos++ = 0x01;
605 kde_len = pos - kde;
606 }
607 }
608 #endif /* CONFIG_P2P */
609
610 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
611 kde, kde_len, ptk) < 0)
612 goto failed;
613
614 os_free(kde_buf);
615 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
616 return;
617
618 failed:
619 os_free(kde_buf);
620 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
621 }
622
623
wpa_sm_start_preauth(void * eloop_ctx,void * timeout_ctx)624 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
625 {
626 struct wpa_sm *sm = eloop_ctx;
627 rsn_preauth_candidate_process(sm);
628 }
629
630
wpa_supplicant_key_neg_complete(struct wpa_sm * sm,const u8 * addr,int secure)631 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
632 const u8 *addr, int secure)
633 {
634 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
635 "WPA: Key negotiation completed with "
636 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
637 wpa_cipher_txt(sm->pairwise_cipher),
638 wpa_cipher_txt(sm->group_cipher));
639 wpa_sm_cancel_auth_timeout(sm);
640 wpa_sm_set_state(sm, WPA_COMPLETED);
641
642 if (secure) {
643 wpa_sm_mlme_setprotection(
644 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
645 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
646 eapol_sm_notify_portValid(sm->eapol, TRUE);
647 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt))
648 eapol_sm_notify_eap_success(sm->eapol, TRUE);
649 /*
650 * Start preauthentication after a short wait to avoid a
651 * possible race condition between the data receive and key
652 * configuration after the 4-Way Handshake. This increases the
653 * likelihood of the first preauth EAPOL-Start frame getting to
654 * the target AP.
655 */
656 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
657 }
658
659 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
660 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
661 "RSN: Authenticator accepted "
662 "opportunistic PMKSA entry - marking it valid");
663 sm->cur_pmksa->opportunistic = 0;
664 }
665
666 #ifdef CONFIG_IEEE80211R
667 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
668 /* Prepare for the next transition */
669 wpa_ft_prepare_auth_request(sm, NULL);
670 }
671 #endif /* CONFIG_IEEE80211R */
672 }
673
674
wpa_sm_rekey_ptk(void * eloop_ctx,void * timeout_ctx)675 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
676 {
677 struct wpa_sm *sm = eloop_ctx;
678 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Request PTK rekeying");
679 wpa_sm_key_request(sm, 0, 1);
680 }
681
682
wpa_supplicant_install_ptk(struct wpa_sm * sm,const struct wpa_eapol_key * key)683 static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
684 const struct wpa_eapol_key *key)
685 {
686 int keylen, rsclen;
687 enum wpa_alg alg;
688 const u8 *key_rsc;
689
690 if (!sm->tk_to_set) {
691 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
692 "WPA: Do not re-install same PTK to the driver");
693 return 0;
694 }
695
696 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
697 "WPA: Installing PTK to the driver");
698
699 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
700 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher "
701 "Suite: NONE - do not use pairwise keys");
702 return 0;
703 }
704
705 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
706 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
707 "WPA: Unsupported pairwise cipher %d",
708 sm->pairwise_cipher);
709 return -1;
710 }
711
712 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
713 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
714 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher);
715
716 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
717 key_rsc = null_rsc;
718 } else {
719 key_rsc = key->key_rsc;
720 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
721 }
722
723 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
724 sm->ptk.tk, keylen) < 0) {
725 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
726 "WPA: Failed to set PTK to the "
727 "driver (alg=%d keylen=%d bssid=" MACSTR ")",
728 alg, keylen, MAC2STR(sm->bssid));
729 return -1;
730 }
731
732 /* TK is not needed anymore in supplicant */
733 os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
734 sm->tk_to_set = 0;
735
736 if (sm->wpa_ptk_rekey) {
737 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
738 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
739 sm, NULL);
740 }
741
742 return 0;
743 }
744
745
wpa_supplicant_check_group_cipher(struct wpa_sm * sm,int group_cipher,int keylen,int maxkeylen,int * key_rsc_len,enum wpa_alg * alg)746 static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm,
747 int group_cipher,
748 int keylen, int maxkeylen,
749 int *key_rsc_len,
750 enum wpa_alg *alg)
751 {
752 int klen;
753
754 *alg = wpa_cipher_to_alg(group_cipher);
755 if (*alg == WPA_ALG_NONE) {
756 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
757 "WPA: Unsupported Group Cipher %d",
758 group_cipher);
759 return -1;
760 }
761 *key_rsc_len = wpa_cipher_rsc_len(group_cipher);
762
763 klen = wpa_cipher_key_len(group_cipher);
764 if (keylen != klen || maxkeylen < klen) {
765 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
766 "WPA: Unsupported %s Group Cipher key length %d (%d)",
767 wpa_cipher_txt(group_cipher), keylen, maxkeylen);
768 return -1;
769 }
770 return 0;
771 }
772
773
774 struct wpa_gtk_data {
775 enum wpa_alg alg;
776 int tx, key_rsc_len, keyidx;
777 u8 gtk[32];
778 int gtk_len;
779 };
780
781
wpa_supplicant_install_gtk(struct wpa_sm * sm,const struct wpa_gtk_data * gd,const u8 * key_rsc)782 static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
783 const struct wpa_gtk_data *gd,
784 const u8 *key_rsc)
785 {
786 const u8 *_gtk = gd->gtk;
787 u8 gtk_buf[32];
788
789 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
790 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
791 "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)",
792 gd->keyidx, gd->tx, gd->gtk_len);
793 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
794 if (sm->group_cipher == WPA_CIPHER_TKIP) {
795 /* Swap Tx/Rx keys for Michael MIC */
796 os_memcpy(gtk_buf, gd->gtk, 16);
797 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
798 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
799 _gtk = gtk_buf;
800 }
801 if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
802 if (wpa_sm_set_key(sm, gd->alg, NULL,
803 gd->keyidx, 1, key_rsc, gd->key_rsc_len,
804 _gtk, gd->gtk_len) < 0) {
805 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
806 "WPA: Failed to set GTK to the driver "
807 "(Group only)");
808 os_memset(gtk_buf, 0, sizeof(gtk_buf));
809 return -1;
810 }
811 } else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr,
812 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
813 _gtk, gd->gtk_len) < 0) {
814 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
815 "WPA: Failed to set GTK to "
816 "the driver (alg=%d keylen=%d keyidx=%d)",
817 gd->alg, gd->gtk_len, gd->keyidx);
818 os_memset(gtk_buf, 0, sizeof(gtk_buf));
819 return -1;
820 }
821 os_memset(gtk_buf, 0, sizeof(gtk_buf));
822
823 return 0;
824 }
825
826
wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm * sm,int tx)827 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
828 int tx)
829 {
830 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
831 /* Ignore Tx bit for GTK if a pairwise key is used. One AP
832 * seemed to set this bit (incorrectly, since Tx is only when
833 * doing Group Key only APs) and without this workaround, the
834 * data connection does not work because wpa_supplicant
835 * configured non-zero keyidx to be used for unicast. */
836 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
837 "WPA: Tx bit set for GTK, but pairwise "
838 "keys are used - ignore Tx bit");
839 return 0;
840 }
841 return tx;
842 }
843
844
wpa_supplicant_rsc_relaxation(const struct wpa_sm * sm,const u8 * rsc)845 static int wpa_supplicant_rsc_relaxation(const struct wpa_sm *sm,
846 const u8 *rsc)
847 {
848 int rsclen;
849
850 if (!sm->wpa_rsc_relaxation)
851 return 0;
852
853 rsclen = wpa_cipher_rsc_len(sm->group_cipher);
854
855 /*
856 * Try to detect RSC (endian) corruption issue where the AP sends
857 * the RSC bytes in EAPOL-Key message in the wrong order, both if
858 * it's actually a 6-byte field (as it should be) and if it treats
859 * it as an 8-byte field.
860 * An AP model known to have this bug is the Sapido RB-1632.
861 */
862 if (rsclen == 6 && ((rsc[5] && !rsc[0]) || rsc[6] || rsc[7])) {
863 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
864 "RSC %02x%02x%02x%02x%02x%02x%02x%02x is likely bogus, using 0",
865 rsc[0], rsc[1], rsc[2], rsc[3],
866 rsc[4], rsc[5], rsc[6], rsc[7]);
867
868 return 1;
869 }
870
871 return 0;
872 }
873
874
wpa_supplicant_pairwise_gtk(struct wpa_sm * sm,const struct wpa_eapol_key * key,const u8 * gtk,size_t gtk_len,int key_info)875 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
876 const struct wpa_eapol_key *key,
877 const u8 *gtk, size_t gtk_len,
878 int key_info)
879 {
880 struct wpa_gtk_data gd;
881 const u8 *key_rsc;
882
883 /*
884 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
885 * GTK KDE format:
886 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
887 * Reserved [bits 0-7]
888 * GTK
889 */
890
891 os_memset(&gd, 0, sizeof(gd));
892 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
893 gtk, gtk_len);
894
895 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
896 return -1;
897
898 gd.keyidx = gtk[0] & 0x3;
899 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
900 !!(gtk[0] & BIT(2)));
901 gtk += 2;
902 gtk_len -= 2;
903
904 os_memcpy(gd.gtk, gtk, gtk_len);
905 gd.gtk_len = gtk_len;
906
907 key_rsc = key->key_rsc;
908 if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
909 key_rsc = null_rsc;
910
911 if (sm->group_cipher != WPA_CIPHER_GTK_NOT_USED &&
912 (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
913 gtk_len, gtk_len,
914 &gd.key_rsc_len, &gd.alg) ||
915 wpa_supplicant_install_gtk(sm, &gd, key_rsc))) {
916 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
917 "RSN: Failed to install GTK");
918 os_memset(&gd, 0, sizeof(gd));
919 return -1;
920 }
921 os_memset(&gd, 0, sizeof(gd));
922
923 wpa_supplicant_key_neg_complete(sm, sm->bssid,
924 key_info & WPA_KEY_INFO_SECURE);
925 return 0;
926 }
927
928
ieee80211w_set_keys(struct wpa_sm * sm,struct wpa_eapol_ie_parse * ie)929 static int ieee80211w_set_keys(struct wpa_sm *sm,
930 struct wpa_eapol_ie_parse *ie)
931 {
932 #ifdef CONFIG_IEEE80211W
933 if (!wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher))
934 return 0;
935
936 if (ie->igtk) {
937 size_t len;
938 const struct wpa_igtk_kde *igtk;
939 u16 keyidx;
940 len = wpa_cipher_key_len(sm->mgmt_group_cipher);
941 if (ie->igtk_len != WPA_IGTK_KDE_PREFIX_LEN + len)
942 return -1;
943 igtk = (const struct wpa_igtk_kde *) ie->igtk;
944 keyidx = WPA_GET_LE16(igtk->keyid);
945 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: IGTK keyid %d "
946 "pn %02x%02x%02x%02x%02x%02x",
947 keyidx, MAC2STR(igtk->pn));
948 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK",
949 igtk->igtk, len);
950 if (keyidx > 4095) {
951 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
952 "WPA: Invalid IGTK KeyID %d", keyidx);
953 return -1;
954 }
955 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
956 broadcast_ether_addr,
957 keyidx, 0, igtk->pn, sizeof(igtk->pn),
958 igtk->igtk, len) < 0) {
959 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
960 "WPA: Failed to configure IGTK to the driver");
961 return -1;
962 }
963 }
964
965 return 0;
966 #else /* CONFIG_IEEE80211W */
967 return 0;
968 #endif /* CONFIG_IEEE80211W */
969 }
970
971
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)972 static void wpa_report_ie_mismatch(struct wpa_sm *sm,
973 const char *reason, const u8 *src_addr,
974 const u8 *wpa_ie, size_t wpa_ie_len,
975 const u8 *rsn_ie, size_t rsn_ie_len)
976 {
977 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
978 reason, MAC2STR(src_addr));
979
980 if (sm->ap_wpa_ie) {
981 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
982 sm->ap_wpa_ie, sm->ap_wpa_ie_len);
983 }
984 if (wpa_ie) {
985 if (!sm->ap_wpa_ie) {
986 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
987 "WPA: No WPA IE in Beacon/ProbeResp");
988 }
989 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
990 wpa_ie, wpa_ie_len);
991 }
992
993 if (sm->ap_rsn_ie) {
994 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
995 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
996 }
997 if (rsn_ie) {
998 if (!sm->ap_rsn_ie) {
999 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1000 "WPA: No RSN IE in Beacon/ProbeResp");
1001 }
1002 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
1003 rsn_ie, rsn_ie_len);
1004 }
1005
1006 wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
1007 }
1008
1009
1010 #ifdef CONFIG_IEEE80211R
1011
ft_validate_mdie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie,const u8 * assoc_resp_mdie)1012 static int ft_validate_mdie(struct wpa_sm *sm,
1013 const unsigned char *src_addr,
1014 struct wpa_eapol_ie_parse *ie,
1015 const u8 *assoc_resp_mdie)
1016 {
1017 struct rsn_mdie *mdie;
1018
1019 mdie = (struct rsn_mdie *) (ie->mdie + 2);
1020 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
1021 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
1022 MOBILITY_DOMAIN_ID_LEN) != 0) {
1023 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did "
1024 "not match with the current mobility domain");
1025 return -1;
1026 }
1027
1028 if (assoc_resp_mdie &&
1029 (assoc_resp_mdie[1] != ie->mdie[1] ||
1030 os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) {
1031 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch");
1032 wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4",
1033 ie->mdie, 2 + ie->mdie[1]);
1034 wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response",
1035 assoc_resp_mdie, 2 + assoc_resp_mdie[1]);
1036 return -1;
1037 }
1038
1039 return 0;
1040 }
1041
1042
ft_validate_ftie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie,const u8 * assoc_resp_ftie)1043 static int ft_validate_ftie(struct wpa_sm *sm,
1044 const unsigned char *src_addr,
1045 struct wpa_eapol_ie_parse *ie,
1046 const u8 *assoc_resp_ftie)
1047 {
1048 if (ie->ftie == NULL) {
1049 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1050 "FT: No FTIE in EAPOL-Key msg 3/4");
1051 return -1;
1052 }
1053
1054 if (assoc_resp_ftie == NULL)
1055 return 0;
1056
1057 if (assoc_resp_ftie[1] != ie->ftie[1] ||
1058 os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) {
1059 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch");
1060 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4",
1061 ie->ftie, 2 + ie->ftie[1]);
1062 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response",
1063 assoc_resp_ftie, 2 + assoc_resp_ftie[1]);
1064 return -1;
1065 }
1066
1067 return 0;
1068 }
1069
1070
ft_validate_rsnie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)1071 static int ft_validate_rsnie(struct wpa_sm *sm,
1072 const unsigned char *src_addr,
1073 struct wpa_eapol_ie_parse *ie)
1074 {
1075 struct wpa_ie_data rsn;
1076
1077 if (!ie->rsn_ie)
1078 return 0;
1079
1080 /*
1081 * Verify that PMKR1Name from EAPOL-Key message 3/4
1082 * matches with the value we derived.
1083 */
1084 if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 ||
1085 rsn.num_pmkid != 1 || rsn.pmkid == NULL) {
1086 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in "
1087 "FT 4-way handshake message 3/4");
1088 return -1;
1089 }
1090
1091 if (os_memcmp_const(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
1092 {
1093 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1094 "FT: PMKR1Name mismatch in "
1095 "FT 4-way handshake message 3/4");
1096 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator",
1097 rsn.pmkid, WPA_PMK_NAME_LEN);
1098 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1099 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1100 return -1;
1101 }
1102
1103 return 0;
1104 }
1105
1106
wpa_supplicant_validate_ie_ft(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)1107 static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm,
1108 const unsigned char *src_addr,
1109 struct wpa_eapol_ie_parse *ie)
1110 {
1111 const u8 *pos, *end, *mdie = NULL, *ftie = NULL;
1112
1113 if (sm->assoc_resp_ies) {
1114 pos = sm->assoc_resp_ies;
1115 end = pos + sm->assoc_resp_ies_len;
1116 while (end - pos > 2) {
1117 if (2 + pos[1] > end - pos)
1118 break;
1119 switch (*pos) {
1120 case WLAN_EID_MOBILITY_DOMAIN:
1121 mdie = pos;
1122 break;
1123 case WLAN_EID_FAST_BSS_TRANSITION:
1124 ftie = pos;
1125 break;
1126 }
1127 pos += 2 + pos[1];
1128 }
1129 }
1130
1131 if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 ||
1132 ft_validate_ftie(sm, src_addr, ie, ftie) < 0 ||
1133 ft_validate_rsnie(sm, src_addr, ie) < 0)
1134 return -1;
1135
1136 return 0;
1137 }
1138
1139 #endif /* CONFIG_IEEE80211R */
1140
1141
wpa_supplicant_validate_ie(struct wpa_sm * sm,const unsigned char * src_addr,struct wpa_eapol_ie_parse * ie)1142 static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
1143 const unsigned char *src_addr,
1144 struct wpa_eapol_ie_parse *ie)
1145 {
1146 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
1147 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1148 "WPA: No WPA/RSN IE for this AP known. "
1149 "Trying to get from scan results");
1150 if (wpa_sm_get_beacon_ie(sm) < 0) {
1151 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1152 "WPA: Could not find AP from "
1153 "the scan results");
1154 } else {
1155 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
1156 "WPA: Found the current AP from "
1157 "updated scan results");
1158 }
1159 }
1160
1161 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
1162 (sm->ap_wpa_ie || sm->ap_rsn_ie)) {
1163 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
1164 "with IE in Beacon/ProbeResp (no IE?)",
1165 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1166 ie->rsn_ie, ie->rsn_ie_len);
1167 return -1;
1168 }
1169
1170 if ((ie->wpa_ie && sm->ap_wpa_ie &&
1171 (ie->wpa_ie_len != sm->ap_wpa_ie_len ||
1172 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
1173 (ie->rsn_ie && sm->ap_rsn_ie &&
1174 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
1175 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
1176 ie->rsn_ie, ie->rsn_ie_len))) {
1177 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
1178 "with IE in Beacon/ProbeResp",
1179 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1180 ie->rsn_ie, ie->rsn_ie_len);
1181 return -1;
1182 }
1183
1184 if (sm->proto == WPA_PROTO_WPA &&
1185 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
1186 wpa_report_ie_mismatch(sm, "Possible downgrade attack "
1187 "detected - RSN was enabled and RSN IE "
1188 "was in msg 3/4, but not in "
1189 "Beacon/ProbeResp",
1190 src_addr, ie->wpa_ie, ie->wpa_ie_len,
1191 ie->rsn_ie, ie->rsn_ie_len);
1192 return -1;
1193 }
1194
1195 #ifdef CONFIG_IEEE80211R
1196 if (wpa_key_mgmt_ft(sm->key_mgmt) &&
1197 wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0)
1198 return -1;
1199 #endif /* CONFIG_IEEE80211R */
1200
1201 return 0;
1202 }
1203
1204
1205 /**
1206 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
1207 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1208 * @dst: Destination address for the frame
1209 * @key: Pointer to the EAPOL-Key frame header
1210 * @ver: Version bits from EAPOL-Key Key Info
1211 * @key_info: Key Info
1212 * @ptk: PTK to use for keyed hash and encryption
1213 * Returns: >= 0 on success, < 0 on failure
1214 */
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)1215 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
1216 const struct wpa_eapol_key *key,
1217 u16 ver, u16 key_info,
1218 struct wpa_ptk *ptk)
1219 {
1220 size_t mic_len, hdrlen, rlen;
1221 struct wpa_eapol_key *reply;
1222 u8 *rbuf, *key_mic;
1223
1224 mic_len = wpa_mic_len(sm->key_mgmt);
1225 hdrlen = sizeof(*reply) + mic_len + 2;
1226 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1227 hdrlen, &rlen, (void *) &reply);
1228 if (rbuf == NULL)
1229 return -1;
1230
1231 reply->type = (sm->proto == WPA_PROTO_RSN ||
1232 sm->proto == WPA_PROTO_OSEN) ?
1233 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1234 key_info &= WPA_KEY_INFO_SECURE;
1235 key_info |= ver | WPA_KEY_INFO_KEY_TYPE;
1236 if (mic_len)
1237 key_info |= WPA_KEY_INFO_MIC;
1238 else
1239 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1240 WPA_PUT_BE16(reply->key_info, key_info);
1241 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
1242 WPA_PUT_BE16(reply->key_length, 0);
1243 else
1244 os_memcpy(reply->key_length, key->key_length, 2);
1245 os_memcpy(reply->replay_counter, key->replay_counter,
1246 WPA_REPLAY_COUNTER_LEN);
1247
1248 key_mic = (u8 *) (reply + 1);
1249 WPA_PUT_BE16(key_mic + mic_len, 0);
1250
1251 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
1252 return wpa_eapol_key_send(sm, ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen,
1253 key_mic);
1254 }
1255
1256
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)1257 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
1258 const struct wpa_eapol_key *key,
1259 u16 ver, const u8 *key_data,
1260 size_t key_data_len)
1261 {
1262 u16 key_info, keylen;
1263 struct wpa_eapol_ie_parse ie;
1264
1265 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
1266 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way "
1267 "Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
1268
1269 key_info = WPA_GET_BE16(key->key_info);
1270
1271 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", key_data, key_data_len);
1272 if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
1273 goto failed;
1274 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1275 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1276 "WPA: GTK IE in unencrypted key data");
1277 goto failed;
1278 }
1279 #ifdef CONFIG_IEEE80211W
1280 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1281 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1282 "WPA: IGTK KDE in unencrypted key data");
1283 goto failed;
1284 }
1285
1286 if (ie.igtk &&
1287 wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher) &&
1288 ie.igtk_len != WPA_IGTK_KDE_PREFIX_LEN +
1289 (unsigned int) wpa_cipher_key_len(sm->mgmt_group_cipher)) {
1290 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1291 "WPA: Invalid IGTK KDE length %lu",
1292 (unsigned long) ie.igtk_len);
1293 goto failed;
1294 }
1295 #endif /* CONFIG_IEEE80211W */
1296
1297 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
1298 goto failed;
1299
1300 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
1301 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1302 "WPA: ANonce from message 1 of 4-Way Handshake "
1303 "differs from 3 of 4-Way Handshake - drop packet (src="
1304 MACSTR ")", MAC2STR(sm->bssid));
1305 goto failed;
1306 }
1307
1308 keylen = WPA_GET_BE16(key->key_length);
1309 if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) {
1310 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1311 "WPA: Invalid %s key length %d (src=" MACSTR
1312 ")", wpa_cipher_txt(sm->pairwise_cipher), keylen,
1313 MAC2STR(sm->bssid));
1314 goto failed;
1315 }
1316
1317 #ifdef CONFIG_P2P
1318 if (ie.ip_addr_alloc) {
1319 os_memcpy(sm->p2p_ip_addr, ie.ip_addr_alloc, 3 * 4);
1320 wpa_hexdump(MSG_DEBUG, "P2P: IP address info",
1321 sm->p2p_ip_addr, sizeof(sm->p2p_ip_addr));
1322 }
1323 #endif /* CONFIG_P2P */
1324
1325 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
1326 &sm->ptk) < 0) {
1327 goto failed;
1328 }
1329
1330 /* SNonce was successfully used in msg 3/4, so mark it to be renewed
1331 * for the next 4-Way Handshake. If msg 3 is received again, the old
1332 * SNonce will still be used to avoid changing PTK. */
1333 sm->renew_snonce = 1;
1334
1335 if (key_info & WPA_KEY_INFO_INSTALL) {
1336 if (wpa_supplicant_install_ptk(sm, key))
1337 goto failed;
1338 }
1339
1340 if (key_info & WPA_KEY_INFO_SECURE) {
1341 wpa_sm_mlme_setprotection(
1342 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
1343 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
1344 eapol_sm_notify_portValid(sm->eapol, TRUE);
1345 }
1346 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1347
1348 if (sm->group_cipher == WPA_CIPHER_GTK_NOT_USED) {
1349 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1350 key_info & WPA_KEY_INFO_SECURE);
1351 } else if (ie.gtk &&
1352 wpa_supplicant_pairwise_gtk(sm, key,
1353 ie.gtk, ie.gtk_len, key_info) < 0) {
1354 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1355 "RSN: Failed to configure GTK");
1356 goto failed;
1357 }
1358
1359 if (ieee80211w_set_keys(sm, &ie) < 0) {
1360 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1361 "RSN: Failed to configure IGTK");
1362 goto failed;
1363 }
1364
1365 if (ie.gtk)
1366 wpa_sm_set_rekey_offload(sm);
1367
1368 if (sm->proto == WPA_PROTO_RSN && wpa_key_mgmt_suite_b(sm->key_mgmt)) {
1369 struct rsn_pmksa_cache_entry *sa;
1370
1371 sa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, NULL,
1372 sm->ptk.kck, sm->ptk.kck_len,
1373 sm->bssid, sm->own_addr,
1374 sm->network_ctx, sm->key_mgmt);
1375 if (!sm->cur_pmksa)
1376 sm->cur_pmksa = sa;
1377 }
1378
1379 sm->msg_3_of_4_ok = 1;
1380 return;
1381
1382 failed:
1383 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1384 }
1385
1386
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)1387 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
1388 const u8 *keydata,
1389 size_t keydatalen,
1390 u16 key_info,
1391 struct wpa_gtk_data *gd)
1392 {
1393 int maxkeylen;
1394 struct wpa_eapol_ie_parse ie;
1395
1396 wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data",
1397 keydata, keydatalen);
1398 if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0)
1399 return -1;
1400 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1401 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1402 "WPA: GTK IE in unencrypted key data");
1403 return -1;
1404 }
1405 if (ie.gtk == NULL) {
1406 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1407 "WPA: No GTK IE in Group Key msg 1/2");
1408 return -1;
1409 }
1410 maxkeylen = gd->gtk_len = ie.gtk_len - 2;
1411
1412 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
1413 gd->gtk_len, maxkeylen,
1414 &gd->key_rsc_len, &gd->alg))
1415 return -1;
1416
1417 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake",
1418 ie.gtk, ie.gtk_len);
1419 gd->keyidx = ie.gtk[0] & 0x3;
1420 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
1421 !!(ie.gtk[0] & BIT(2)));
1422 if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
1423 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1424 "RSN: Too long GTK in GTK IE (len=%lu)",
1425 (unsigned long) ie.gtk_len - 2);
1426 return -1;
1427 }
1428 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
1429
1430 if (ieee80211w_set_keys(sm, &ie) < 0)
1431 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1432 "RSN: Failed to configure IGTK");
1433
1434 return 0;
1435 }
1436
1437
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)1438 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
1439 const struct wpa_eapol_key *key,
1440 const u8 *key_data,
1441 size_t key_data_len, u16 key_info,
1442 u16 ver, struct wpa_gtk_data *gd)
1443 {
1444 size_t maxkeylen;
1445 u16 gtk_len;
1446
1447 gtk_len = WPA_GET_BE16(key->key_length);
1448 maxkeylen = key_data_len;
1449 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1450 if (maxkeylen < 8) {
1451 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1452 "WPA: Too short maxkeylen (%lu)",
1453 (unsigned long) maxkeylen);
1454 return -1;
1455 }
1456 maxkeylen -= 8;
1457 }
1458
1459 if (gtk_len > maxkeylen ||
1460 wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
1461 gtk_len, maxkeylen,
1462 &gd->key_rsc_len, &gd->alg))
1463 return -1;
1464
1465 gd->gtk_len = gtk_len;
1466 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1467 WPA_KEY_INFO_KEY_INDEX_SHIFT;
1468 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) {
1469 #ifdef CONFIG_NO_RC4
1470 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1471 "WPA: RC4 not supported in the build");
1472 return -1;
1473 #else /* CONFIG_NO_RC4 */
1474 u8 ek[32];
1475 if (key_data_len > sizeof(gd->gtk)) {
1476 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1477 "WPA: RC4 key data too long (%lu)",
1478 (unsigned long) key_data_len);
1479 return -1;
1480 }
1481 os_memcpy(ek, key->key_iv, 16);
1482 os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len);
1483 os_memcpy(gd->gtk, key_data, key_data_len);
1484 if (rc4_skip(ek, 32, 256, gd->gtk, key_data_len)) {
1485 os_memset(ek, 0, sizeof(ek));
1486 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1487 "WPA: RC4 failed");
1488 return -1;
1489 }
1490 os_memset(ek, 0, sizeof(ek));
1491 #endif /* CONFIG_NO_RC4 */
1492 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1493 if (maxkeylen % 8) {
1494 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1495 "WPA: Unsupported AES-WRAP len %lu",
1496 (unsigned long) maxkeylen);
1497 return -1;
1498 }
1499 if (maxkeylen > sizeof(gd->gtk)) {
1500 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1501 "WPA: AES-WRAP key data "
1502 "too long (keydatalen=%lu maxkeylen=%lu)",
1503 (unsigned long) key_data_len,
1504 (unsigned long) maxkeylen);
1505 return -1;
1506 }
1507 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, maxkeylen / 8,
1508 key_data, gd->gtk)) {
1509 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1510 "WPA: AES unwrap failed - could not decrypt "
1511 "GTK");
1512 return -1;
1513 }
1514 } else {
1515 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1516 "WPA: Unsupported key_info type %d", ver);
1517 return -1;
1518 }
1519 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1520 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1521 return 0;
1522 }
1523
1524
wpa_supplicant_send_2_of_2(struct wpa_sm * sm,const struct wpa_eapol_key * key,int ver,u16 key_info)1525 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1526 const struct wpa_eapol_key *key,
1527 int ver, u16 key_info)
1528 {
1529 size_t mic_len, hdrlen, rlen;
1530 struct wpa_eapol_key *reply;
1531 u8 *rbuf, *key_mic;
1532
1533 mic_len = wpa_mic_len(sm->key_mgmt);
1534 hdrlen = sizeof(*reply) + mic_len + 2;
1535 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1536 hdrlen, &rlen, (void *) &reply);
1537 if (rbuf == NULL)
1538 return -1;
1539
1540 reply->type = (sm->proto == WPA_PROTO_RSN ||
1541 sm->proto == WPA_PROTO_OSEN) ?
1542 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1543 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1544 key_info |= ver | WPA_KEY_INFO_SECURE;
1545 if (mic_len)
1546 key_info |= WPA_KEY_INFO_MIC;
1547 WPA_PUT_BE16(reply->key_info, key_info);
1548 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
1549 WPA_PUT_BE16(reply->key_length, 0);
1550 else
1551 os_memcpy(reply->key_length, key->key_length, 2);
1552 os_memcpy(reply->replay_counter, key->replay_counter,
1553 WPA_REPLAY_COUNTER_LEN);
1554
1555 key_mic = (u8 *) (reply + 1);
1556 WPA_PUT_BE16(key_mic + mic_len, 0);
1557
1558 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1559 return wpa_eapol_key_send(sm, &sm->ptk, ver, sm->bssid, ETH_P_EAPOL,
1560 rbuf, rlen, key_mic);
1561 }
1562
1563
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)1564 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1565 const unsigned char *src_addr,
1566 const struct wpa_eapol_key *key,
1567 const u8 *key_data,
1568 size_t key_data_len, u16 ver)
1569 {
1570 u16 key_info;
1571 int rekey, ret;
1572 struct wpa_gtk_data gd;
1573 const u8 *key_rsc;
1574
1575 if (!sm->msg_3_of_4_ok) {
1576 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1577 "WPA: Group Key Handshake started prior to completion of 4-way handshake");
1578 goto failed;
1579 }
1580
1581 os_memset(&gd, 0, sizeof(gd));
1582
1583 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1584 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key "
1585 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1586
1587 key_info = WPA_GET_BE16(key->key_info);
1588
1589 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
1590 ret = wpa_supplicant_process_1_of_2_rsn(sm, key_data,
1591 key_data_len, key_info,
1592 &gd);
1593 } else {
1594 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, key_data,
1595 key_data_len,
1596 key_info, ver, &gd);
1597 }
1598
1599 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1600
1601 if (ret)
1602 goto failed;
1603
1604 key_rsc = key->key_rsc;
1605 if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
1606 key_rsc = null_rsc;
1607
1608 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc) ||
1609 wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0)
1610 goto failed;
1611 os_memset(&gd, 0, sizeof(gd));
1612
1613 if (rekey) {
1614 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying "
1615 "completed with " MACSTR " [GTK=%s]",
1616 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1617 wpa_sm_cancel_auth_timeout(sm);
1618 wpa_sm_set_state(sm, WPA_COMPLETED);
1619 } else {
1620 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1621 key_info &
1622 WPA_KEY_INFO_SECURE);
1623 }
1624
1625 wpa_sm_set_rekey_offload(sm);
1626
1627 return;
1628
1629 failed:
1630 os_memset(&gd, 0, sizeof(gd));
1631 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1632 }
1633
1634
wpa_supplicant_verify_eapol_key_mic(struct wpa_sm * sm,struct wpa_eapol_key * key,u16 ver,const u8 * buf,size_t len)1635 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1636 struct wpa_eapol_key *key,
1637 u16 ver,
1638 const u8 *buf, size_t len)
1639 {
1640 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1641 int ok = 0;
1642 size_t mic_len = wpa_mic_len(sm->key_mgmt);
1643
1644 os_memcpy(mic, key + 1, mic_len);
1645 if (sm->tptk_set) {
1646 os_memset(key + 1, 0, mic_len);
1647 wpa_eapol_key_mic(sm->tptk.kck, sm->tptk.kck_len, sm->key_mgmt,
1648 ver, buf, len, (u8 *) (key + 1));
1649 if (os_memcmp_const(mic, key + 1, mic_len) != 0) {
1650 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1651 "WPA: Invalid EAPOL-Key MIC "
1652 "when using TPTK - ignoring TPTK");
1653 } else {
1654 ok = 1;
1655 sm->tptk_set = 0;
1656 sm->ptk_set = 1;
1657 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1658 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
1659 }
1660 }
1661
1662 if (!ok && sm->ptk_set) {
1663 os_memset(key + 1, 0, mic_len);
1664 wpa_eapol_key_mic(sm->ptk.kck, sm->ptk.kck_len, sm->key_mgmt,
1665 ver, buf, len, (u8 *) (key + 1));
1666 if (os_memcmp_const(mic, key + 1, mic_len) != 0) {
1667 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1668 "WPA: Invalid EAPOL-Key MIC - "
1669 "dropping packet");
1670 return -1;
1671 }
1672 ok = 1;
1673 }
1674
1675 if (!ok) {
1676 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1677 "WPA: Could not verify EAPOL-Key MIC - "
1678 "dropping packet");
1679 return -1;
1680 }
1681
1682 os_memcpy(sm->rx_replay_counter, key->replay_counter,
1683 WPA_REPLAY_COUNTER_LEN);
1684 sm->rx_replay_counter_set = 1;
1685 return 0;
1686 }
1687
1688
1689 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
wpa_supplicant_decrypt_key_data(struct wpa_sm * sm,struct wpa_eapol_key * key,size_t mic_len,u16 ver,u8 * key_data,size_t * key_data_len)1690 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1691 struct wpa_eapol_key *key,
1692 size_t mic_len, u16 ver,
1693 u8 *key_data, size_t *key_data_len)
1694 {
1695 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1696 key_data, *key_data_len);
1697 if (!sm->ptk_set) {
1698 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1699 "WPA: PTK not available, cannot decrypt EAPOL-Key Key "
1700 "Data");
1701 return -1;
1702 }
1703
1704 /* Decrypt key data here so that this operation does not need
1705 * to be implemented separately for each message type. */
1706 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) {
1707 #ifdef CONFIG_NO_RC4
1708 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1709 "WPA: RC4 not supported in the build");
1710 return -1;
1711 #else /* CONFIG_NO_RC4 */
1712 u8 ek[32];
1713 os_memcpy(ek, key->key_iv, 16);
1714 os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len);
1715 if (rc4_skip(ek, 32, 256, key_data, *key_data_len)) {
1716 os_memset(ek, 0, sizeof(ek));
1717 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
1718 "WPA: RC4 failed");
1719 return -1;
1720 }
1721 os_memset(ek, 0, sizeof(ek));
1722 #endif /* CONFIG_NO_RC4 */
1723 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1724 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC ||
1725 sm->key_mgmt == WPA_KEY_MGMT_OSEN ||
1726 wpa_key_mgmt_suite_b(sm->key_mgmt)) {
1727 u8 *buf;
1728 if (*key_data_len < 8 || *key_data_len % 8) {
1729 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1730 "WPA: Unsupported AES-WRAP len %u",
1731 (unsigned int) *key_data_len);
1732 return -1;
1733 }
1734 *key_data_len -= 8; /* AES-WRAP adds 8 bytes */
1735 buf = os_malloc(*key_data_len);
1736 if (buf == NULL) {
1737 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1738 "WPA: No memory for AES-UNWRAP buffer");
1739 return -1;
1740 }
1741 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, *key_data_len / 8,
1742 key_data, buf)) {
1743 bin_clear_free(buf, *key_data_len);
1744 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1745 "WPA: AES unwrap failed - "
1746 "could not decrypt EAPOL-Key key data");
1747 return -1;
1748 }
1749 os_memcpy(key_data, buf, *key_data_len);
1750 bin_clear_free(buf, *key_data_len);
1751 WPA_PUT_BE16(((u8 *) (key + 1)) + mic_len, *key_data_len);
1752 } else {
1753 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1754 "WPA: Unsupported key_info type %d", ver);
1755 return -1;
1756 }
1757 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1758 key_data, *key_data_len);
1759 return 0;
1760 }
1761
1762
1763 /**
1764 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1765 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1766 */
wpa_sm_aborted_cached(struct wpa_sm * sm)1767 void wpa_sm_aborted_cached(struct wpa_sm *sm)
1768 {
1769 if (sm && sm->cur_pmksa) {
1770 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1771 "RSN: Cancelling PMKSA caching attempt");
1772 sm->cur_pmksa = NULL;
1773 }
1774 }
1775
1776
wpa_eapol_key_dump(struct wpa_sm * sm,const struct wpa_eapol_key * key,unsigned int key_data_len,const u8 * mic,unsigned int mic_len)1777 static void wpa_eapol_key_dump(struct wpa_sm *sm,
1778 const struct wpa_eapol_key *key,
1779 unsigned int key_data_len,
1780 const u8 *mic, unsigned int mic_len)
1781 {
1782 #ifndef CONFIG_NO_STDOUT_DEBUG
1783 u16 key_info = WPA_GET_BE16(key->key_info);
1784
1785 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type);
1786 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1787 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)",
1788 key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1789 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1790 WPA_KEY_INFO_KEY_INDEX_SHIFT,
1791 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1792 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1793 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1794 key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1795 key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1796 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1797 key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1798 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1799 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1800 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1801 " key_length=%u key_data_length=%u",
1802 WPA_GET_BE16(key->key_length), key_data_len);
1803 wpa_hexdump(MSG_DEBUG, " replay_counter",
1804 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1805 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN);
1806 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16);
1807 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8);
1808 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8);
1809 wpa_hexdump(MSG_DEBUG, " key_mic", mic, mic_len);
1810 #endif /* CONFIG_NO_STDOUT_DEBUG */
1811 }
1812
1813
1814 #ifdef CONFIG_FILS
wpa_supp_aead_decrypt(struct wpa_sm * sm,u8 * buf,size_t buf_len,size_t * key_data_len)1815 static int wpa_supp_aead_decrypt(struct wpa_sm *sm, u8 *buf, size_t buf_len,
1816 size_t *key_data_len)
1817 {
1818 struct wpa_ptk *ptk;
1819 struct ieee802_1x_hdr *hdr;
1820 struct wpa_eapol_key *key;
1821 u8 *pos, *tmp;
1822 const u8 *aad[1];
1823 size_t aad_len[1];
1824
1825 if (*key_data_len < AES_BLOCK_SIZE) {
1826 wpa_printf(MSG_INFO, "No room for AES-SIV data in the frame");
1827 return -1;
1828 }
1829
1830 if (sm->tptk_set)
1831 ptk = &sm->tptk;
1832 else if (sm->ptk_set)
1833 ptk = &sm->ptk;
1834 else
1835 return -1;
1836
1837 hdr = (struct ieee802_1x_hdr *) buf;
1838 key = (struct wpa_eapol_key *) (hdr + 1);
1839 pos = (u8 *) (key + 1);
1840 pos += 2; /* Pointing at the Encrypted Key Data field */
1841
1842 tmp = os_malloc(*key_data_len);
1843 if (!tmp)
1844 return -1;
1845
1846 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1847 * to Key Data (exclusive). */
1848 aad[0] = buf;
1849 aad_len[0] = pos - buf;
1850 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, *key_data_len,
1851 1, aad, aad_len, tmp) < 0) {
1852 wpa_printf(MSG_INFO, "Invalid AES-SIV data in the frame");
1853 bin_clear_free(tmp, *key_data_len);
1854 return -1;
1855 }
1856
1857 /* AEAD decryption and validation completed successfully */
1858 (*key_data_len) -= AES_BLOCK_SIZE;
1859 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
1860 tmp, *key_data_len);
1861
1862 /* Replace Key Data field with the decrypted version */
1863 os_memcpy(pos, tmp, *key_data_len);
1864 pos -= 2; /* Key Data Length field */
1865 WPA_PUT_BE16(pos, *key_data_len);
1866 bin_clear_free(tmp, *key_data_len);
1867
1868 if (sm->tptk_set) {
1869 sm->tptk_set = 0;
1870 sm->ptk_set = 1;
1871 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1872 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
1873 }
1874
1875 os_memcpy(sm->rx_replay_counter, key->replay_counter,
1876 WPA_REPLAY_COUNTER_LEN);
1877 sm->rx_replay_counter_set = 1;
1878
1879 return 0;
1880 }
1881 #endif /* CONFIG_FILS */
1882
1883
1884 /**
1885 * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1886 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1887 * @src_addr: Source MAC address of the EAPOL packet
1888 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1889 * @len: Length of the EAPOL frame
1890 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1891 *
1892 * This function is called for each received EAPOL frame. Other than EAPOL-Key
1893 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1894 * only processing WPA and WPA2 EAPOL-Key frames.
1895 *
1896 * The received EAPOL-Key packets are validated and valid packets are replied
1897 * to. In addition, key material (PTK, GTK) is configured at the end of a
1898 * successful key handshake.
1899 */
wpa_sm_rx_eapol(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1900 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1901 const u8 *buf, size_t len)
1902 {
1903 size_t plen, data_len, key_data_len;
1904 const struct ieee802_1x_hdr *hdr;
1905 struct wpa_eapol_key *key;
1906 u16 key_info, ver;
1907 u8 *tmp = NULL;
1908 int ret = -1;
1909 struct wpa_peerkey *peerkey = NULL;
1910 u8 *mic, *key_data;
1911 size_t mic_len, keyhdrlen;
1912
1913 #ifdef CONFIG_IEEE80211R
1914 sm->ft_completed = 0;
1915 #endif /* CONFIG_IEEE80211R */
1916
1917 mic_len = wpa_mic_len(sm->key_mgmt);
1918 keyhdrlen = sizeof(*key) + mic_len + 2;
1919
1920 if (len < sizeof(*hdr) + keyhdrlen) {
1921 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1922 "WPA: EAPOL frame too short to be a WPA "
1923 "EAPOL-Key (len %lu, expecting at least %lu)",
1924 (unsigned long) len,
1925 (unsigned long) sizeof(*hdr) + keyhdrlen);
1926 return 0;
1927 }
1928
1929 hdr = (const struct ieee802_1x_hdr *) buf;
1930 plen = be_to_host16(hdr->length);
1931 data_len = plen + sizeof(*hdr);
1932 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1933 "IEEE 802.1X RX: version=%d type=%d length=%lu",
1934 hdr->version, hdr->type, (unsigned long) plen);
1935
1936 if (hdr->version < EAPOL_VERSION) {
1937 /* TODO: backwards compatibility */
1938 }
1939 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1940 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1941 "WPA: EAPOL frame (type %u) discarded, "
1942 "not a Key frame", hdr->type);
1943 ret = 0;
1944 goto out;
1945 }
1946 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", buf, len);
1947 if (plen > len - sizeof(*hdr) || plen < keyhdrlen) {
1948 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1949 "WPA: EAPOL frame payload size %lu "
1950 "invalid (frame size %lu)",
1951 (unsigned long) plen, (unsigned long) len);
1952 ret = 0;
1953 goto out;
1954 }
1955 if (data_len < len) {
1956 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1957 "WPA: ignoring %lu bytes after the IEEE 802.1X data",
1958 (unsigned long) len - data_len);
1959 }
1960
1961 /*
1962 * Make a copy of the frame since we need to modify the buffer during
1963 * MAC validation and Key Data decryption.
1964 */
1965 tmp = os_malloc(data_len);
1966 if (tmp == NULL)
1967 goto out;
1968 os_memcpy(tmp, buf, data_len);
1969 key = (struct wpa_eapol_key *) (tmp + sizeof(struct ieee802_1x_hdr));
1970 mic = (u8 *) (key + 1);
1971 key_data = mic + mic_len + 2;
1972
1973 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1974 {
1975 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1976 "WPA: EAPOL-Key type (%d) unknown, discarded",
1977 key->type);
1978 ret = 0;
1979 goto out;
1980 }
1981
1982 key_data_len = WPA_GET_BE16(mic + mic_len);
1983 wpa_eapol_key_dump(sm, key, key_data_len, mic, mic_len);
1984
1985 if (key_data_len > plen - keyhdrlen) {
1986 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1987 "frame - key_data overflow (%u > %u)",
1988 (unsigned int) key_data_len,
1989 (unsigned int) (plen - keyhdrlen));
1990 goto out;
1991 }
1992
1993 eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1994 key_info = WPA_GET_BE16(key->key_info);
1995 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1996 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1997 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
1998 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1999 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
2000 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
2001 !wpa_key_mgmt_suite_b(sm->key_mgmt) &&
2002 !wpa_key_mgmt_fils(sm->key_mgmt) &&
2003 sm->key_mgmt != WPA_KEY_MGMT_OSEN) {
2004 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2005 "WPA: Unsupported EAPOL-Key descriptor version %d",
2006 ver);
2007 goto out;
2008 }
2009
2010 if (sm->key_mgmt == WPA_KEY_MGMT_OSEN &&
2011 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
2012 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2013 "OSEN: Unsupported EAPOL-Key descriptor version %d",
2014 ver);
2015 goto out;
2016 }
2017
2018 if ((wpa_key_mgmt_suite_b(sm->key_mgmt) ||
2019 wpa_key_mgmt_fils(sm->key_mgmt)) &&
2020 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
2021 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2022 "RSN: Unsupported EAPOL-Key descriptor version %d (expected AKM defined = 0)",
2023 ver);
2024 goto out;
2025 }
2026
2027 #ifdef CONFIG_IEEE80211R
2028 if (wpa_key_mgmt_ft(sm->key_mgmt)) {
2029 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
2030 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
2031 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2032 "FT: AP did not use AES-128-CMAC");
2033 goto out;
2034 }
2035 } else
2036 #endif /* CONFIG_IEEE80211R */
2037 #ifdef CONFIG_IEEE80211W
2038 if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
2039 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
2040 sm->key_mgmt != WPA_KEY_MGMT_OSEN &&
2041 !wpa_key_mgmt_fils(sm->key_mgmt) &&
2042 !wpa_key_mgmt_suite_b(sm->key_mgmt)) {
2043 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2044 "WPA: AP did not use the "
2045 "negotiated AES-128-CMAC");
2046 goto out;
2047 }
2048 } else
2049 #endif /* CONFIG_IEEE80211W */
2050 if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
2051 !wpa_key_mgmt_suite_b(sm->key_mgmt) &&
2052 !wpa_key_mgmt_fils(sm->key_mgmt) &&
2053 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
2054 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2055 "WPA: CCMP is used, but EAPOL-Key "
2056 "descriptor version (%d) is not 2", ver);
2057 if (sm->group_cipher != WPA_CIPHER_CCMP &&
2058 !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
2059 /* Earlier versions of IEEE 802.11i did not explicitly
2060 * require version 2 descriptor for all EAPOL-Key
2061 * packets, so allow group keys to use version 1 if
2062 * CCMP is not used for them. */
2063 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2064 "WPA: Backwards compatibility: allow invalid "
2065 "version for non-CCMP group keys");
2066 } else if (ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
2067 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2068 "WPA: Interoperability workaround: allow incorrect (should have been HMAC-SHA1), but stronger (is AES-128-CMAC), descriptor version to be used");
2069 } else
2070 goto out;
2071 } else if (sm->pairwise_cipher == WPA_CIPHER_GCMP &&
2072 !wpa_key_mgmt_suite_b(sm->key_mgmt) &&
2073 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
2074 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2075 "WPA: GCMP is used, but EAPOL-Key "
2076 "descriptor version (%d) is not 2", ver);
2077 goto out;
2078 }
2079
2080 #ifdef CONFIG_PEERKEY
2081 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
2082 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
2083 break;
2084 }
2085
2086 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
2087 if (!peerkey->initiator && peerkey->replay_counter_set &&
2088 os_memcmp(key->replay_counter, peerkey->replay_counter,
2089 WPA_REPLAY_COUNTER_LEN) <= 0) {
2090 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
2091 "RSN: EAPOL-Key Replay Counter did not "
2092 "increase (STK) - dropping packet");
2093 goto out;
2094 } else if (peerkey->initiator) {
2095 u8 _tmp[WPA_REPLAY_COUNTER_LEN];
2096 os_memcpy(_tmp, key->replay_counter,
2097 WPA_REPLAY_COUNTER_LEN);
2098 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
2099 if (os_memcmp(_tmp, peerkey->replay_counter,
2100 WPA_REPLAY_COUNTER_LEN) != 0) {
2101 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2102 "RSN: EAPOL-Key Replay "
2103 "Counter did not match (STK) - "
2104 "dropping packet");
2105 goto out;
2106 }
2107 }
2108 }
2109
2110 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
2111 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2112 "RSN: Ack bit in key_info from STK peer");
2113 goto out;
2114 }
2115 #endif /* CONFIG_PEERKEY */
2116
2117 if (!peerkey && sm->rx_replay_counter_set &&
2118 os_memcmp(key->replay_counter, sm->rx_replay_counter,
2119 WPA_REPLAY_COUNTER_LEN) <= 0) {
2120 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
2121 "WPA: EAPOL-Key Replay Counter did not increase - "
2122 "dropping packet");
2123 goto out;
2124 }
2125
2126 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
2127 #ifdef CONFIG_PEERKEY
2128 && (peerkey == NULL || !peerkey->initiator)
2129 #endif /* CONFIG_PEERKEY */
2130 ) {
2131 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2132 "WPA: No Ack bit in key_info");
2133 goto out;
2134 }
2135
2136 if (key_info & WPA_KEY_INFO_REQUEST) {
2137 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
2138 "WPA: EAPOL-Key with Request bit - dropped");
2139 goto out;
2140 }
2141
2142 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
2143 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
2144 goto out;
2145
2146 #ifdef CONFIG_PEERKEY
2147 if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
2148 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp,
2149 data_len))
2150 goto out;
2151 #endif /* CONFIG_PEERKEY */
2152
2153 #ifdef CONFIG_FILS
2154 if (!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
2155 if (wpa_supp_aead_decrypt(sm, tmp, data_len, &key_data_len))
2156 goto out;
2157 }
2158 #endif /* CONFIG_FILS */
2159
2160 if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) &&
2161 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) && mic_len) {
2162 if (wpa_supplicant_decrypt_key_data(sm, key, mic_len,
2163 ver, key_data,
2164 &key_data_len))
2165 goto out;
2166 }
2167
2168 if (key_info & WPA_KEY_INFO_KEY_TYPE) {
2169 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
2170 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
2171 "WPA: Ignored EAPOL-Key (Pairwise) with "
2172 "non-zero key index");
2173 goto out;
2174 }
2175 if (peerkey) {
2176 /* PeerKey 4-Way Handshake */
2177 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver,
2178 key_data, key_data_len);
2179 } else if (key_info & (WPA_KEY_INFO_MIC |
2180 WPA_KEY_INFO_ENCR_KEY_DATA)) {
2181 /* 3/4 4-Way Handshake */
2182 wpa_supplicant_process_3_of_4(sm, key, ver, key_data,
2183 key_data_len);
2184 } else {
2185 /* 1/4 4-Way Handshake */
2186 wpa_supplicant_process_1_of_4(sm, src_addr, key,
2187 ver, key_data,
2188 key_data_len);
2189 }
2190 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
2191 /* PeerKey SMK Handshake */
2192 peerkey_rx_eapol_smk(sm, src_addr, key, key_data, key_data_len,
2193 key_info, ver);
2194 } else {
2195 if ((mic_len && (key_info & WPA_KEY_INFO_MIC)) ||
2196 (!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA))) {
2197 /* 1/2 Group Key Handshake */
2198 wpa_supplicant_process_1_of_2(sm, src_addr, key,
2199 key_data, key_data_len,
2200 ver);
2201 } else {
2202 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
2203 "WPA: EAPOL-Key (Group) without Mic/Encr bit - "
2204 "dropped");
2205 }
2206 }
2207
2208 ret = 1;
2209
2210 out:
2211 bin_clear_free(tmp, data_len);
2212 return ret;
2213 }
2214
2215
2216 #ifdef CONFIG_CTRL_IFACE
wpa_key_mgmt_suite(struct wpa_sm * sm)2217 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
2218 {
2219 switch (sm->key_mgmt) {
2220 case WPA_KEY_MGMT_IEEE8021X:
2221 return ((sm->proto == WPA_PROTO_RSN ||
2222 sm->proto == WPA_PROTO_OSEN) ?
2223 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
2224 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
2225 case WPA_KEY_MGMT_PSK:
2226 return (sm->proto == WPA_PROTO_RSN ?
2227 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
2228 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
2229 #ifdef CONFIG_IEEE80211R
2230 case WPA_KEY_MGMT_FT_IEEE8021X:
2231 return RSN_AUTH_KEY_MGMT_FT_802_1X;
2232 case WPA_KEY_MGMT_FT_PSK:
2233 return RSN_AUTH_KEY_MGMT_FT_PSK;
2234 #endif /* CONFIG_IEEE80211R */
2235 #ifdef CONFIG_IEEE80211W
2236 case WPA_KEY_MGMT_IEEE8021X_SHA256:
2237 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
2238 case WPA_KEY_MGMT_PSK_SHA256:
2239 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
2240 #endif /* CONFIG_IEEE80211W */
2241 case WPA_KEY_MGMT_CCKM:
2242 return (sm->proto == WPA_PROTO_RSN ?
2243 RSN_AUTH_KEY_MGMT_CCKM:
2244 WPA_AUTH_KEY_MGMT_CCKM);
2245 case WPA_KEY_MGMT_WPA_NONE:
2246 return WPA_AUTH_KEY_MGMT_NONE;
2247 case WPA_KEY_MGMT_IEEE8021X_SUITE_B:
2248 return RSN_AUTH_KEY_MGMT_802_1X_SUITE_B;
2249 case WPA_KEY_MGMT_IEEE8021X_SUITE_B_192:
2250 return RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192;
2251 default:
2252 return 0;
2253 }
2254 }
2255
2256
2257 #define RSN_SUITE "%02x-%02x-%02x-%d"
2258 #define RSN_SUITE_ARG(s) \
2259 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2260
2261 /**
2262 * wpa_sm_get_mib - Dump text list of MIB entries
2263 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2264 * @buf: Buffer for the list
2265 * @buflen: Length of the buffer
2266 * Returns: Number of bytes written to buffer
2267 *
2268 * This function is used fetch dot11 MIB variables.
2269 */
wpa_sm_get_mib(struct wpa_sm * sm,char * buf,size_t buflen)2270 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
2271 {
2272 char pmkid_txt[PMKID_LEN * 2 + 1];
2273 int rsna, ret;
2274 size_t len;
2275
2276 if (sm->cur_pmksa) {
2277 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2278 sm->cur_pmksa->pmkid, PMKID_LEN);
2279 } else
2280 pmkid_txt[0] = '\0';
2281
2282 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
2283 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
2284 sm->proto == WPA_PROTO_RSN)
2285 rsna = 1;
2286 else
2287 rsna = 0;
2288
2289 ret = os_snprintf(buf, buflen,
2290 "dot11RSNAOptionImplemented=TRUE\n"
2291 "dot11RSNAPreauthenticationImplemented=TRUE\n"
2292 "dot11RSNAEnabled=%s\n"
2293 "dot11RSNAPreauthenticationEnabled=%s\n"
2294 "dot11RSNAConfigVersion=%d\n"
2295 "dot11RSNAConfigPairwiseKeysSupported=5\n"
2296 "dot11RSNAConfigGroupCipherSize=%d\n"
2297 "dot11RSNAConfigPMKLifetime=%d\n"
2298 "dot11RSNAConfigPMKReauthThreshold=%d\n"
2299 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
2300 "dot11RSNAConfigSATimeout=%d\n",
2301 rsna ? "TRUE" : "FALSE",
2302 rsna ? "TRUE" : "FALSE",
2303 RSN_VERSION,
2304 wpa_cipher_key_len(sm->group_cipher) * 8,
2305 sm->dot11RSNAConfigPMKLifetime,
2306 sm->dot11RSNAConfigPMKReauthThreshold,
2307 sm->dot11RSNAConfigSATimeout);
2308 if (os_snprintf_error(buflen, ret))
2309 return 0;
2310 len = ret;
2311
2312 ret = os_snprintf(
2313 buf + len, buflen - len,
2314 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2315 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2316 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2317 "dot11RSNAPMKIDUsed=%s\n"
2318 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2319 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2320 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2321 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
2322 "dot11RSNA4WayHandshakeFailures=%u\n",
2323 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
2324 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
2325 sm->pairwise_cipher)),
2326 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
2327 sm->group_cipher)),
2328 pmkid_txt,
2329 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
2330 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
2331 sm->pairwise_cipher)),
2332 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
2333 sm->group_cipher)),
2334 sm->dot11RSNA4WayHandshakeFailures);
2335 if (!os_snprintf_error(buflen - len, ret))
2336 len += ret;
2337
2338 return (int) len;
2339 }
2340 #endif /* CONFIG_CTRL_IFACE */
2341
2342
wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx,enum pmksa_free_reason reason)2343 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
2344 void *ctx, enum pmksa_free_reason reason)
2345 {
2346 struct wpa_sm *sm = ctx;
2347 int deauth = 0;
2348
2349 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: "
2350 MACSTR " reason=%d", MAC2STR(entry->aa), reason);
2351
2352 if (sm->cur_pmksa == entry) {
2353 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2354 "RSN: %s current PMKSA entry",
2355 reason == PMKSA_REPLACE ? "replaced" : "removed");
2356 pmksa_cache_clear_current(sm);
2357
2358 /*
2359 * If an entry is simply being replaced, there's no need to
2360 * deauthenticate because it will be immediately re-added.
2361 * This happens when EAP authentication is completed again
2362 * (reauth or failed PMKSA caching attempt).
2363 */
2364 if (reason != PMKSA_REPLACE)
2365 deauth = 1;
2366 }
2367
2368 if (reason == PMKSA_EXPIRE &&
2369 (sm->pmk_len == entry->pmk_len &&
2370 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
2371 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2372 "RSN: deauthenticating due to expired PMK");
2373 pmksa_cache_clear_current(sm);
2374 deauth = 1;
2375 }
2376
2377 if (deauth) {
2378 os_memset(sm->pmk, 0, sizeof(sm->pmk));
2379 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
2380 }
2381 }
2382
2383
2384 /**
2385 * wpa_sm_init - Initialize WPA state machine
2386 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
2387 * Returns: Pointer to the allocated WPA state machine data
2388 *
2389 * This function is used to allocate a new WPA state machine and the returned
2390 * value is passed to all WPA state machine calls.
2391 */
wpa_sm_init(struct wpa_sm_ctx * ctx)2392 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
2393 {
2394 struct wpa_sm *sm;
2395
2396 sm = os_zalloc(sizeof(*sm));
2397 if (sm == NULL)
2398 return NULL;
2399 dl_list_init(&sm->pmksa_candidates);
2400 sm->renew_snonce = 1;
2401 sm->ctx = ctx;
2402
2403 sm->dot11RSNAConfigPMKLifetime = 43200;
2404 sm->dot11RSNAConfigPMKReauthThreshold = 70;
2405 sm->dot11RSNAConfigSATimeout = 60;
2406
2407 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
2408 if (sm->pmksa == NULL) {
2409 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
2410 "RSN: PMKSA cache initialization failed");
2411 os_free(sm);
2412 return NULL;
2413 }
2414
2415 return sm;
2416 }
2417
2418
2419 /**
2420 * wpa_sm_deinit - Deinitialize WPA state machine
2421 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2422 */
wpa_sm_deinit(struct wpa_sm * sm)2423 void wpa_sm_deinit(struct wpa_sm *sm)
2424 {
2425 if (sm == NULL)
2426 return;
2427 pmksa_cache_deinit(sm->pmksa);
2428 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
2429 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
2430 os_free(sm->assoc_wpa_ie);
2431 os_free(sm->ap_wpa_ie);
2432 os_free(sm->ap_rsn_ie);
2433 wpa_sm_drop_sa(sm);
2434 os_free(sm->ctx);
2435 peerkey_deinit(sm);
2436 #ifdef CONFIG_IEEE80211R
2437 os_free(sm->assoc_resp_ies);
2438 #endif /* CONFIG_IEEE80211R */
2439 #ifdef CONFIG_TESTING_OPTIONS
2440 wpabuf_free(sm->test_assoc_ie);
2441 #endif /* CONFIG_TESTING_OPTIONS */
2442 os_free(sm);
2443 }
2444
2445
2446 /**
2447 * wpa_sm_notify_assoc - Notify WPA state machine about association
2448 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2449 * @bssid: The BSSID of the new association
2450 *
2451 * This function is called to let WPA state machine know that the connection
2452 * was established.
2453 */
wpa_sm_notify_assoc(struct wpa_sm * sm,const u8 * bssid)2454 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
2455 {
2456 int clear_ptk = 1;
2457
2458 if (sm == NULL)
2459 return;
2460
2461 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2462 "WPA: Association event - clear replay counter");
2463 os_memcpy(sm->bssid, bssid, ETH_ALEN);
2464 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
2465 sm->rx_replay_counter_set = 0;
2466 sm->renew_snonce = 1;
2467 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
2468 rsn_preauth_deinit(sm);
2469
2470 #ifdef CONFIG_IEEE80211R
2471 if (wpa_ft_is_completed(sm)) {
2472 /*
2473 * Clear portValid to kick EAPOL state machine to re-enter
2474 * AUTHENTICATED state to get the EAPOL port Authorized.
2475 */
2476 eapol_sm_notify_portValid(sm->eapol, FALSE);
2477 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
2478
2479 /* Prepare for the next transition */
2480 wpa_ft_prepare_auth_request(sm, NULL);
2481
2482 clear_ptk = 0;
2483 }
2484 #endif /* CONFIG_IEEE80211R */
2485 #ifdef CONFIG_FILS
2486 if (sm->fils_completed) {
2487 /*
2488 * Clear portValid to kick EAPOL state machine to re-enter
2489 * AUTHENTICATED state to get the EAPOL port Authorized.
2490 */
2491 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
2492 clear_ptk = 0;
2493 }
2494 #endif /* CONFIG_FILS */
2495
2496 if (clear_ptk) {
2497 /*
2498 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
2499 * this is not part of a Fast BSS Transition.
2500 */
2501 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK");
2502 sm->ptk_set = 0;
2503 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
2504 sm->tptk_set = 0;
2505 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
2506 }
2507
2508 #ifdef CONFIG_TDLS
2509 wpa_tdls_assoc(sm);
2510 #endif /* CONFIG_TDLS */
2511
2512 #ifdef CONFIG_P2P
2513 os_memset(sm->p2p_ip_addr, 0, sizeof(sm->p2p_ip_addr));
2514 #endif /* CONFIG_P2P */
2515 }
2516
2517
2518 /**
2519 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
2520 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2521 *
2522 * This function is called to let WPA state machine know that the connection
2523 * was lost. This will abort any existing pre-authentication session.
2524 */
wpa_sm_notify_disassoc(struct wpa_sm * sm)2525 void wpa_sm_notify_disassoc(struct wpa_sm *sm)
2526 {
2527 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
2528 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
2529 peerkey_deinit(sm);
2530 rsn_preauth_deinit(sm);
2531 pmksa_cache_clear_current(sm);
2532 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
2533 sm->dot11RSNA4WayHandshakeFailures++;
2534 #ifdef CONFIG_TDLS
2535 wpa_tdls_disassoc(sm);
2536 #endif /* CONFIG_TDLS */
2537 #ifdef CONFIG_FILS
2538 sm->fils_completed = 0;
2539 #endif /* CONFIG_FILS */
2540
2541 /* Keys are not needed in the WPA state machine anymore */
2542 wpa_sm_drop_sa(sm);
2543
2544 sm->msg_3_of_4_ok = 0;
2545 }
2546
2547
2548 /**
2549 * wpa_sm_set_pmk - Set PMK
2550 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2551 * @pmk: The new PMK
2552 * @pmk_len: The length of the new PMK in bytes
2553 * @pmkid: Calculated PMKID
2554 * @bssid: AA to add into PMKSA cache or %NULL to not cache the PMK
2555 *
2556 * Configure the PMK for WPA state machine.
2557 */
wpa_sm_set_pmk(struct wpa_sm * sm,const u8 * pmk,size_t pmk_len,const u8 * pmkid,const u8 * bssid)2558 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len,
2559 const u8 *pmkid, const u8 *bssid)
2560 {
2561 if (sm == NULL)
2562 return;
2563
2564 sm->pmk_len = pmk_len;
2565 os_memcpy(sm->pmk, pmk, pmk_len);
2566
2567 #ifdef CONFIG_IEEE80211R
2568 /* Set XXKey to be PSK for FT key derivation */
2569 sm->xxkey_len = pmk_len;
2570 os_memcpy(sm->xxkey, pmk, pmk_len);
2571 #endif /* CONFIG_IEEE80211R */
2572
2573 if (bssid) {
2574 pmksa_cache_add(sm->pmksa, pmk, pmk_len, pmkid, NULL, 0,
2575 bssid, sm->own_addr,
2576 sm->network_ctx, sm->key_mgmt);
2577 }
2578 }
2579
2580
2581 /**
2582 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
2583 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2584 *
2585 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
2586 * will be cleared.
2587 */
wpa_sm_set_pmk_from_pmksa(struct wpa_sm * sm)2588 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
2589 {
2590 if (sm == NULL)
2591 return;
2592
2593 if (sm->cur_pmksa) {
2594 sm->pmk_len = sm->cur_pmksa->pmk_len;
2595 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
2596 } else {
2597 sm->pmk_len = PMK_LEN;
2598 os_memset(sm->pmk, 0, PMK_LEN);
2599 }
2600 }
2601
2602
2603 /**
2604 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
2605 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2606 * @fast_reauth: Whether fast reauthentication (EAP) is allowed
2607 */
wpa_sm_set_fast_reauth(struct wpa_sm * sm,int fast_reauth)2608 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
2609 {
2610 if (sm)
2611 sm->fast_reauth = fast_reauth;
2612 }
2613
2614
2615 /**
2616 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
2617 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2618 * @scard_ctx: Context pointer for smartcard related callback functions
2619 */
wpa_sm_set_scard_ctx(struct wpa_sm * sm,void * scard_ctx)2620 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
2621 {
2622 if (sm == NULL)
2623 return;
2624 sm->scard_ctx = scard_ctx;
2625 if (sm->preauth_eapol)
2626 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
2627 }
2628
2629
2630 /**
2631 * wpa_sm_set_config - Notification of current configration change
2632 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2633 * @config: Pointer to current network configuration
2634 *
2635 * Notify WPA state machine that configuration has changed. config will be
2636 * stored as a backpointer to network configuration. This can be %NULL to clear
2637 * the stored pointed.
2638 */
wpa_sm_set_config(struct wpa_sm * sm,struct rsn_supp_config * config)2639 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
2640 {
2641 if (!sm)
2642 return;
2643
2644 if (config) {
2645 sm->network_ctx = config->network_ctx;
2646 sm->peerkey_enabled = config->peerkey_enabled;
2647 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2648 sm->proactive_key_caching = config->proactive_key_caching;
2649 sm->eap_workaround = config->eap_workaround;
2650 sm->eap_conf_ctx = config->eap_conf_ctx;
2651 if (config->ssid) {
2652 os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2653 sm->ssid_len = config->ssid_len;
2654 } else
2655 sm->ssid_len = 0;
2656 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
2657 sm->p2p = config->p2p;
2658 sm->wpa_rsc_relaxation = config->wpa_rsc_relaxation;
2659 } else {
2660 sm->network_ctx = NULL;
2661 sm->peerkey_enabled = 0;
2662 sm->allowed_pairwise_cipher = 0;
2663 sm->proactive_key_caching = 0;
2664 sm->eap_workaround = 0;
2665 sm->eap_conf_ctx = NULL;
2666 sm->ssid_len = 0;
2667 sm->wpa_ptk_rekey = 0;
2668 sm->p2p = 0;
2669 sm->wpa_rsc_relaxation = 0;
2670 }
2671 }
2672
2673
2674 /**
2675 * wpa_sm_set_own_addr - Set own MAC address
2676 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2677 * @addr: Own MAC address
2678 */
wpa_sm_set_own_addr(struct wpa_sm * sm,const u8 * addr)2679 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2680 {
2681 if (sm)
2682 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2683 }
2684
2685
2686 /**
2687 * wpa_sm_set_ifname - Set network interface name
2688 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2689 * @ifname: Interface name
2690 * @bridge_ifname: Optional bridge interface name (for pre-auth)
2691 */
wpa_sm_set_ifname(struct wpa_sm * sm,const char * ifname,const char * bridge_ifname)2692 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2693 const char *bridge_ifname)
2694 {
2695 if (sm) {
2696 sm->ifname = ifname;
2697 sm->bridge_ifname = bridge_ifname;
2698 }
2699 }
2700
2701
2702 /**
2703 * wpa_sm_set_eapol - Set EAPOL state machine pointer
2704 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2705 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2706 */
wpa_sm_set_eapol(struct wpa_sm * sm,struct eapol_sm * eapol)2707 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2708 {
2709 if (sm)
2710 sm->eapol = eapol;
2711 }
2712
2713
2714 /**
2715 * wpa_sm_set_param - Set WPA state machine parameters
2716 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2717 * @param: Parameter field
2718 * @value: Parameter value
2719 * Returns: 0 on success, -1 on failure
2720 */
wpa_sm_set_param(struct wpa_sm * sm,enum wpa_sm_conf_params param,unsigned int value)2721 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2722 unsigned int value)
2723 {
2724 int ret = 0;
2725
2726 if (sm == NULL)
2727 return -1;
2728
2729 switch (param) {
2730 case RSNA_PMK_LIFETIME:
2731 if (value > 0)
2732 sm->dot11RSNAConfigPMKLifetime = value;
2733 else
2734 ret = -1;
2735 break;
2736 case RSNA_PMK_REAUTH_THRESHOLD:
2737 if (value > 0 && value <= 100)
2738 sm->dot11RSNAConfigPMKReauthThreshold = value;
2739 else
2740 ret = -1;
2741 break;
2742 case RSNA_SA_TIMEOUT:
2743 if (value > 0)
2744 sm->dot11RSNAConfigSATimeout = value;
2745 else
2746 ret = -1;
2747 break;
2748 case WPA_PARAM_PROTO:
2749 sm->proto = value;
2750 break;
2751 case WPA_PARAM_PAIRWISE:
2752 sm->pairwise_cipher = value;
2753 break;
2754 case WPA_PARAM_GROUP:
2755 sm->group_cipher = value;
2756 break;
2757 case WPA_PARAM_KEY_MGMT:
2758 sm->key_mgmt = value;
2759 break;
2760 #ifdef CONFIG_IEEE80211W
2761 case WPA_PARAM_MGMT_GROUP:
2762 sm->mgmt_group_cipher = value;
2763 break;
2764 #endif /* CONFIG_IEEE80211W */
2765 case WPA_PARAM_RSN_ENABLED:
2766 sm->rsn_enabled = value;
2767 break;
2768 case WPA_PARAM_MFP:
2769 sm->mfp = value;
2770 break;
2771 default:
2772 break;
2773 }
2774
2775 return ret;
2776 }
2777
2778
2779 /**
2780 * wpa_sm_get_status - Get WPA state machine
2781 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2782 * @buf: Buffer for status information
2783 * @buflen: Maximum buffer length
2784 * @verbose: Whether to include verbose status information
2785 * Returns: Number of bytes written to buf.
2786 *
2787 * Query WPA state machine for status information. This function fills in
2788 * a text area with current status information. If the buffer (buf) is not
2789 * large enough, status information will be truncated to fit the buffer.
2790 */
wpa_sm_get_status(struct wpa_sm * sm,char * buf,size_t buflen,int verbose)2791 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2792 int verbose)
2793 {
2794 char *pos = buf, *end = buf + buflen;
2795 int ret;
2796
2797 ret = os_snprintf(pos, end - pos,
2798 "pairwise_cipher=%s\n"
2799 "group_cipher=%s\n"
2800 "key_mgmt=%s\n",
2801 wpa_cipher_txt(sm->pairwise_cipher),
2802 wpa_cipher_txt(sm->group_cipher),
2803 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2804 if (os_snprintf_error(end - pos, ret))
2805 return pos - buf;
2806 pos += ret;
2807
2808 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) {
2809 struct wpa_ie_data rsn;
2810 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn)
2811 >= 0 &&
2812 rsn.capabilities & (WPA_CAPABILITY_MFPR |
2813 WPA_CAPABILITY_MFPC)) {
2814 ret = os_snprintf(pos, end - pos, "pmf=%d\n",
2815 (rsn.capabilities &
2816 WPA_CAPABILITY_MFPR) ? 2 : 1);
2817 if (os_snprintf_error(end - pos, ret))
2818 return pos - buf;
2819 pos += ret;
2820 }
2821 }
2822
2823 return pos - buf;
2824 }
2825
2826
wpa_sm_pmf_enabled(struct wpa_sm * sm)2827 int wpa_sm_pmf_enabled(struct wpa_sm *sm)
2828 {
2829 struct wpa_ie_data rsn;
2830
2831 if (sm->mfp == NO_MGMT_FRAME_PROTECTION || !sm->ap_rsn_ie)
2832 return 0;
2833
2834 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) >= 0 &&
2835 rsn.capabilities & (WPA_CAPABILITY_MFPR | WPA_CAPABILITY_MFPC))
2836 return 1;
2837
2838 return 0;
2839 }
2840
2841
2842 /**
2843 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2844 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2845 * @wpa_ie: Pointer to buffer for WPA/RSN IE
2846 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2847 * Returns: 0 on success, -1 on failure
2848 */
wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm * sm,u8 * wpa_ie,size_t * wpa_ie_len)2849 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2850 size_t *wpa_ie_len)
2851 {
2852 int res;
2853
2854 if (sm == NULL)
2855 return -1;
2856
2857 #ifdef CONFIG_TESTING_OPTIONS
2858 if (sm->test_assoc_ie) {
2859 wpa_printf(MSG_DEBUG,
2860 "TESTING: Replace association WPA/RSN IE");
2861 if (*wpa_ie_len < wpabuf_len(sm->test_assoc_ie))
2862 return -1;
2863 os_memcpy(wpa_ie, wpabuf_head(sm->test_assoc_ie),
2864 wpabuf_len(sm->test_assoc_ie));
2865 res = wpabuf_len(sm->test_assoc_ie);
2866 } else
2867 #endif /* CONFIG_TESTING_OPTIONS */
2868 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2869 if (res < 0)
2870 return -1;
2871 *wpa_ie_len = res;
2872
2873 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2874 wpa_ie, *wpa_ie_len);
2875
2876 if (sm->assoc_wpa_ie == NULL) {
2877 /*
2878 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2879 * the correct version of the IE even if PMKSA caching is
2880 * aborted (which would remove PMKID from IE generation).
2881 */
2882 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2883 if (sm->assoc_wpa_ie == NULL)
2884 return -1;
2885
2886 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2887 sm->assoc_wpa_ie_len = *wpa_ie_len;
2888 } else {
2889 wpa_hexdump(MSG_DEBUG,
2890 "WPA: Leave previously set WPA IE default",
2891 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len);
2892 }
2893
2894 return 0;
2895 }
2896
2897
2898 /**
2899 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2900 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2901 * @ie: Pointer to IE data (starting from id)
2902 * @len: IE length
2903 * Returns: 0 on success, -1 on failure
2904 *
2905 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2906 * Request frame. The IE will be used to override the default value generated
2907 * with wpa_sm_set_assoc_wpa_ie_default().
2908 */
wpa_sm_set_assoc_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2909 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2910 {
2911 if (sm == NULL)
2912 return -1;
2913
2914 os_free(sm->assoc_wpa_ie);
2915 if (ie == NULL || len == 0) {
2916 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2917 "WPA: clearing own WPA/RSN IE");
2918 sm->assoc_wpa_ie = NULL;
2919 sm->assoc_wpa_ie_len = 0;
2920 } else {
2921 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2922 sm->assoc_wpa_ie = os_malloc(len);
2923 if (sm->assoc_wpa_ie == NULL)
2924 return -1;
2925
2926 os_memcpy(sm->assoc_wpa_ie, ie, len);
2927 sm->assoc_wpa_ie_len = len;
2928 }
2929
2930 return 0;
2931 }
2932
2933
2934 /**
2935 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2936 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2937 * @ie: Pointer to IE data (starting from id)
2938 * @len: IE length
2939 * Returns: 0 on success, -1 on failure
2940 *
2941 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2942 * frame.
2943 */
wpa_sm_set_ap_wpa_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2944 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2945 {
2946 if (sm == NULL)
2947 return -1;
2948
2949 os_free(sm->ap_wpa_ie);
2950 if (ie == NULL || len == 0) {
2951 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2952 "WPA: clearing AP WPA IE");
2953 sm->ap_wpa_ie = NULL;
2954 sm->ap_wpa_ie_len = 0;
2955 } else {
2956 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2957 sm->ap_wpa_ie = os_malloc(len);
2958 if (sm->ap_wpa_ie == NULL)
2959 return -1;
2960
2961 os_memcpy(sm->ap_wpa_ie, ie, len);
2962 sm->ap_wpa_ie_len = len;
2963 }
2964
2965 return 0;
2966 }
2967
2968
2969 /**
2970 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
2971 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2972 * @ie: Pointer to IE data (starting from id)
2973 * @len: IE length
2974 * Returns: 0 on success, -1 on failure
2975 *
2976 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response
2977 * frame.
2978 */
wpa_sm_set_ap_rsn_ie(struct wpa_sm * sm,const u8 * ie,size_t len)2979 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2980 {
2981 if (sm == NULL)
2982 return -1;
2983
2984 os_free(sm->ap_rsn_ie);
2985 if (ie == NULL || len == 0) {
2986 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
2987 "WPA: clearing AP RSN IE");
2988 sm->ap_rsn_ie = NULL;
2989 sm->ap_rsn_ie_len = 0;
2990 } else {
2991 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2992 sm->ap_rsn_ie = os_malloc(len);
2993 if (sm->ap_rsn_ie == NULL)
2994 return -1;
2995
2996 os_memcpy(sm->ap_rsn_ie, ie, len);
2997 sm->ap_rsn_ie_len = len;
2998 }
2999
3000 return 0;
3001 }
3002
3003
3004 /**
3005 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
3006 * @sm: Pointer to WPA state machine data from wpa_sm_init()
3007 * @data: Pointer to data area for parsing results
3008 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
3009 *
3010 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
3011 * parsed data into data.
3012 */
wpa_sm_parse_own_wpa_ie(struct wpa_sm * sm,struct wpa_ie_data * data)3013 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
3014 {
3015 if (sm == NULL)
3016 return -1;
3017
3018 if (sm->assoc_wpa_ie == NULL) {
3019 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
3020 "WPA: No WPA/RSN IE available from association info");
3021 return -1;
3022 }
3023 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
3024 return -2;
3025 return 0;
3026 }
3027
3028
wpa_sm_pmksa_cache_list(struct wpa_sm * sm,char * buf,size_t len)3029 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len)
3030 {
3031 return pmksa_cache_list(sm->pmksa, buf, len);
3032 }
3033
3034
wpa_sm_pmksa_cache_head(struct wpa_sm * sm)3035 struct rsn_pmksa_cache_entry * wpa_sm_pmksa_cache_head(struct wpa_sm *sm)
3036 {
3037 return pmksa_cache_head(sm->pmksa);
3038 }
3039
3040
3041 struct rsn_pmksa_cache_entry *
wpa_sm_pmksa_cache_add_entry(struct wpa_sm * sm,struct rsn_pmksa_cache_entry * entry)3042 wpa_sm_pmksa_cache_add_entry(struct wpa_sm *sm,
3043 struct rsn_pmksa_cache_entry * entry)
3044 {
3045 return pmksa_cache_add_entry(sm->pmksa, entry);
3046 }
3047
3048
wpa_sm_drop_sa(struct wpa_sm * sm)3049 void wpa_sm_drop_sa(struct wpa_sm *sm)
3050 {
3051 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK");
3052 sm->ptk_set = 0;
3053 sm->tptk_set = 0;
3054 os_memset(sm->pmk, 0, sizeof(sm->pmk));
3055 os_memset(&sm->ptk, 0, sizeof(sm->ptk));
3056 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
3057 #ifdef CONFIG_IEEE80211R
3058 os_memset(sm->xxkey, 0, sizeof(sm->xxkey));
3059 os_memset(sm->pmk_r0, 0, sizeof(sm->pmk_r0));
3060 os_memset(sm->pmk_r1, 0, sizeof(sm->pmk_r1));
3061 #endif /* CONFIG_IEEE80211R */
3062 }
3063
3064
wpa_sm_has_ptk(struct wpa_sm * sm)3065 int wpa_sm_has_ptk(struct wpa_sm *sm)
3066 {
3067 if (sm == NULL)
3068 return 0;
3069 return sm->ptk_set;
3070 }
3071
3072
wpa_sm_update_replay_ctr(struct wpa_sm * sm,const u8 * replay_ctr)3073 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr)
3074 {
3075 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN);
3076 }
3077
3078
wpa_sm_pmksa_cache_flush(struct wpa_sm * sm,void * network_ctx)3079 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx)
3080 {
3081 pmksa_cache_flush(sm->pmksa, network_ctx, NULL, 0);
3082 }
3083
3084
3085 #ifdef CONFIG_WNM
wpa_wnmsleep_install_key(struct wpa_sm * sm,u8 subelem_id,u8 * buf)3086 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf)
3087 {
3088 u16 keyinfo;
3089 u8 keylen; /* plaintext key len */
3090 u8 *key_rsc;
3091
3092 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) {
3093 struct wpa_gtk_data gd;
3094
3095 os_memset(&gd, 0, sizeof(gd));
3096 keylen = wpa_cipher_key_len(sm->group_cipher);
3097 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
3098 gd.alg = wpa_cipher_to_alg(sm->group_cipher);
3099 if (gd.alg == WPA_ALG_NONE) {
3100 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite");
3101 return -1;
3102 }
3103
3104 key_rsc = buf + 5;
3105 keyinfo = WPA_GET_LE16(buf + 2);
3106 gd.gtk_len = keylen;
3107 if (gd.gtk_len != buf[4]) {
3108 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d",
3109 gd.gtk_len, buf[4]);
3110 return -1;
3111 }
3112 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */
3113 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(
3114 sm, !!(keyinfo & WPA_KEY_INFO_TXRX));
3115
3116 os_memcpy(gd.gtk, buf + 13, gd.gtk_len);
3117
3118 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)",
3119 gd.gtk, gd.gtk_len);
3120 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) {
3121 os_memset(&gd, 0, sizeof(gd));
3122 wpa_printf(MSG_DEBUG, "Failed to install the GTK in "
3123 "WNM mode");
3124 return -1;
3125 }
3126 os_memset(&gd, 0, sizeof(gd));
3127 #ifdef CONFIG_IEEE80211W
3128 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) {
3129 struct wpa_igtk_kde igd;
3130 u16 keyidx;
3131
3132 os_memset(&igd, 0, sizeof(igd));
3133 keylen = wpa_cipher_key_len(sm->mgmt_group_cipher);
3134 os_memcpy(igd.keyid, buf + 2, 2);
3135 os_memcpy(igd.pn, buf + 4, 6);
3136
3137 keyidx = WPA_GET_LE16(igd.keyid);
3138 os_memcpy(igd.igtk, buf + 10, keylen);
3139
3140 wpa_hexdump_key(MSG_DEBUG, "Install IGTK (WNM SLEEP)",
3141 igd.igtk, keylen);
3142 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
3143 broadcast_ether_addr,
3144 keyidx, 0, igd.pn, sizeof(igd.pn),
3145 igd.igtk, keylen) < 0) {
3146 wpa_printf(MSG_DEBUG, "Failed to install the IGTK in "
3147 "WNM mode");
3148 os_memset(&igd, 0, sizeof(igd));
3149 return -1;
3150 }
3151 os_memset(&igd, 0, sizeof(igd));
3152 #endif /* CONFIG_IEEE80211W */
3153 } else {
3154 wpa_printf(MSG_DEBUG, "Unknown element id");
3155 return -1;
3156 }
3157
3158 return 0;
3159 }
3160 #endif /* CONFIG_WNM */
3161
3162
3163 #ifdef CONFIG_PEERKEY
wpa_sm_rx_eapol_peerkey(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)3164 int wpa_sm_rx_eapol_peerkey(struct wpa_sm *sm, const u8 *src_addr,
3165 const u8 *buf, size_t len)
3166 {
3167 struct wpa_peerkey *peerkey;
3168
3169 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
3170 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
3171 break;
3172 }
3173
3174 if (!peerkey)
3175 return 0;
3176
3177 wpa_sm_rx_eapol(sm, src_addr, buf, len);
3178
3179 return 1;
3180 }
3181 #endif /* CONFIG_PEERKEY */
3182
3183
3184 #ifdef CONFIG_P2P
3185
wpa_sm_get_p2p_ip_addr(struct wpa_sm * sm,u8 * buf)3186 int wpa_sm_get_p2p_ip_addr(struct wpa_sm *sm, u8 *buf)
3187 {
3188 if (sm == NULL || WPA_GET_BE32(sm->p2p_ip_addr) == 0)
3189 return -1;
3190 os_memcpy(buf, sm->p2p_ip_addr, 3 * 4);
3191 return 0;
3192 }
3193
3194 #endif /* CONFIG_P2P */
3195
3196
wpa_sm_set_rx_replay_ctr(struct wpa_sm * sm,const u8 * rx_replay_counter)3197 void wpa_sm_set_rx_replay_ctr(struct wpa_sm *sm, const u8 *rx_replay_counter)
3198 {
3199 if (rx_replay_counter == NULL)
3200 return;
3201
3202 os_memcpy(sm->rx_replay_counter, rx_replay_counter,
3203 WPA_REPLAY_COUNTER_LEN);
3204 sm->rx_replay_counter_set = 1;
3205 wpa_printf(MSG_DEBUG, "Updated key replay counter");
3206 }
3207
3208
wpa_sm_set_ptk_kck_kek(struct wpa_sm * sm,const u8 * ptk_kck,size_t ptk_kck_len,const u8 * ptk_kek,size_t ptk_kek_len)3209 void wpa_sm_set_ptk_kck_kek(struct wpa_sm *sm,
3210 const u8 *ptk_kck, size_t ptk_kck_len,
3211 const u8 *ptk_kek, size_t ptk_kek_len)
3212 {
3213 if (ptk_kck && ptk_kck_len <= WPA_KCK_MAX_LEN) {
3214 os_memcpy(sm->ptk.kck, ptk_kck, ptk_kck_len);
3215 sm->ptk.kck_len = ptk_kck_len;
3216 wpa_printf(MSG_DEBUG, "Updated PTK KCK");
3217 }
3218 if (ptk_kek && ptk_kek_len <= WPA_KEK_MAX_LEN) {
3219 os_memcpy(sm->ptk.kek, ptk_kek, ptk_kek_len);
3220 sm->ptk.kek_len = ptk_kek_len;
3221 wpa_printf(MSG_DEBUG, "Updated PTK KEK");
3222 }
3223 sm->ptk_set = 1;
3224 }
3225
3226
3227 #ifdef CONFIG_TESTING_OPTIONS
wpa_sm_set_test_assoc_ie(struct wpa_sm * sm,struct wpabuf * buf)3228 void wpa_sm_set_test_assoc_ie(struct wpa_sm *sm, struct wpabuf *buf)
3229 {
3230 wpabuf_free(sm->test_assoc_ie);
3231 sm->test_assoc_ie = buf;
3232 }
3233 #endif /* CONFIG_TESTING_OPTIONS */
3234
3235
3236 #ifdef CONFIG_FILS
3237
fils_build_auth(struct wpa_sm * sm)3238 struct wpabuf * fils_build_auth(struct wpa_sm *sm)
3239 {
3240 struct wpabuf *buf = NULL;
3241 struct wpabuf *erp_msg;
3242
3243 erp_msg = eapol_sm_build_erp_reauth_start(sm->eapol);
3244 if (!erp_msg && !sm->cur_pmksa) {
3245 wpa_printf(MSG_DEBUG,
3246 "FILS: Neither ERP EAP-Initiate/Re-auth nor PMKSA cache entry is available - skip FILS");
3247 goto fail;
3248 }
3249
3250 wpa_printf(MSG_DEBUG, "FILS: Try to use FILS (erp=%d pmksa_cache=%d)",
3251 erp_msg != NULL, sm->cur_pmksa != NULL);
3252
3253 sm->fils_completed = 0;
3254
3255 if (!sm->assoc_wpa_ie) {
3256 wpa_printf(MSG_INFO, "FILS: No own RSN IE set for FILS");
3257 goto fail;
3258 }
3259
3260 if (random_get_bytes(sm->fils_nonce, FILS_NONCE_LEN) < 0 ||
3261 random_get_bytes(sm->fils_session, FILS_SESSION_LEN) < 0)
3262 goto fail;
3263
3264 wpa_hexdump(MSG_DEBUG, "FILS: Generated FILS Nonce",
3265 sm->fils_nonce, FILS_NONCE_LEN);
3266 wpa_hexdump(MSG_DEBUG, "FILS: Generated FILS Session",
3267 sm->fils_session, FILS_SESSION_LEN);
3268
3269 buf = wpabuf_alloc(1000 + sm->assoc_wpa_ie_len);
3270 if (!buf)
3271 goto fail;
3272
3273 /* Fields following the Authentication algorithm number field */
3274
3275 /* Authentication Transaction seq# */
3276 wpabuf_put_le16(buf, 1);
3277
3278 /* Status Code */
3279 wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
3280
3281 /* TODO: Finite Cyclic Group when using PK or PFS */
3282 /* TODO: Element when using PK or PFS */
3283
3284 /* RSNE */
3285 wpa_hexdump(MSG_DEBUG, "FILS: RSNE in FILS Authentication frame",
3286 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len);
3287 wpabuf_put_data(buf, sm->assoc_wpa_ie, sm->assoc_wpa_ie_len);
3288
3289 /* TODO: MDE when using FILS for FT initial association */
3290 /* TODO: FTE when using FILS for FT initial association */
3291
3292 /* FILS Nonce */
3293 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
3294 wpabuf_put_u8(buf, 1 + FILS_NONCE_LEN); /* Length */
3295 /* Element ID Extension */
3296 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_NONCE);
3297 wpabuf_put_data(buf, sm->fils_nonce, FILS_NONCE_LEN);
3298
3299 /* FILS Session */
3300 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
3301 wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN); /* Length */
3302 /* Element ID Extension */
3303 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION);
3304 wpabuf_put_data(buf, sm->fils_session, FILS_SESSION_LEN);
3305
3306 /* FILS Wrapped Data */
3307 sm->fils_erp_pmkid_set = 0;
3308 if (erp_msg) {
3309 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
3310 wpabuf_put_u8(buf, 1 + wpabuf_len(erp_msg)); /* Length */
3311 /* Element ID Extension */
3312 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_WRAPPED_DATA);
3313 wpabuf_put_buf(buf, erp_msg);
3314 /* Calculate pending PMKID here so that we do not need to
3315 * maintain a copy of the EAP-Initiate/Reauth message. */
3316 if (fils_pmkid_erp(sm->key_mgmt, wpabuf_head(erp_msg),
3317 wpabuf_len(erp_msg),
3318 sm->fils_erp_pmkid) == 0)
3319 sm->fils_erp_pmkid_set = 1;
3320 }
3321
3322 wpa_hexdump_buf(MSG_DEBUG, "RSN: FILS fields for Authentication frame",
3323 buf);
3324
3325 fail:
3326 wpabuf_free(erp_msg);
3327 return buf;
3328 }
3329
3330
fils_process_auth(struct wpa_sm * sm,const u8 * data,size_t len)3331 int fils_process_auth(struct wpa_sm *sm, const u8 *data, size_t len)
3332 {
3333 const u8 *pos, *end;
3334 struct ieee802_11_elems elems;
3335 struct wpa_ie_data rsn;
3336 int pmkid_match = 0;
3337 u8 ick[FILS_ICK_MAX_LEN];
3338 size_t ick_len;
3339 int res;
3340
3341 wpa_hexdump(MSG_DEBUG, "FILS: Authentication frame fields",
3342 data, len);
3343 pos = data;
3344 end = data + len;
3345
3346 /* TODO: Finite Cyclic Group when using PK or PFS */
3347 /* TODO: Element when using PK or PFS */
3348
3349 wpa_hexdump(MSG_DEBUG, "FILS: Remaining IEs", pos, end - pos);
3350 if (ieee802_11_parse_elems(pos, end - pos, &elems, 1) == ParseFailed) {
3351 wpa_printf(MSG_DEBUG, "FILS: Could not parse elements");
3352 return -1;
3353 }
3354
3355 /* RSNE */
3356 wpa_hexdump(MSG_DEBUG, "FILS: RSN element", elems.rsn_ie,
3357 elems.rsn_ie_len);
3358 if (!elems.rsn_ie ||
3359 wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, elems.rsn_ie_len + 2,
3360 &rsn) < 0) {
3361 wpa_printf(MSG_DEBUG, "FILS: No RSN element");
3362 return -1;
3363 }
3364
3365 if (!elems.fils_nonce) {
3366 wpa_printf(MSG_DEBUG, "FILS: No FILS Nonce field");
3367 return -1;
3368 }
3369 os_memcpy(sm->fils_anonce, elems.fils_nonce, FILS_NONCE_LEN);
3370 wpa_hexdump(MSG_DEBUG, "FILS: ANonce", sm->fils_anonce, FILS_NONCE_LEN);
3371
3372 /* TODO: MDE when using FILS+FT */
3373 /* TODO: FTE when using FILS+FT */
3374
3375 /* PMKID List */
3376 if (rsn.pmkid && rsn.num_pmkid > 0) {
3377 wpa_hexdump(MSG_DEBUG, "FILS: PMKID List",
3378 rsn.pmkid, rsn.num_pmkid * PMKID_LEN);
3379
3380 if (rsn.num_pmkid != 1) {
3381 wpa_printf(MSG_DEBUG, "FILS: Invalid PMKID selection");
3382 return -1;
3383 }
3384 wpa_hexdump(MSG_DEBUG, "FILS: PMKID", rsn.pmkid, PMKID_LEN);
3385 if (os_memcmp(sm->cur_pmksa->pmkid, rsn.pmkid, PMKID_LEN) != 0)
3386 {
3387 wpa_printf(MSG_DEBUG, "FILS: PMKID mismatch");
3388 wpa_hexdump(MSG_DEBUG, "FILS: Expected PMKID",
3389 sm->cur_pmksa->pmkid, PMKID_LEN);
3390 return -1;
3391 }
3392 wpa_printf(MSG_DEBUG,
3393 "FILS: Matching PMKID - continue using PMKSA caching");
3394 pmkid_match = 1;
3395 }
3396 if (!pmkid_match && sm->cur_pmksa) {
3397 wpa_printf(MSG_DEBUG,
3398 "FILS: No PMKID match - cannot use cached PMKSA entry");
3399 sm->cur_pmksa = NULL;
3400 }
3401
3402 /* FILS Session */
3403 if (!elems.fils_session) {
3404 wpa_printf(MSG_DEBUG, "FILS: No FILS Session element");
3405 return -1;
3406 }
3407 wpa_hexdump(MSG_DEBUG, "FILS: FILS Session", elems.fils_session,
3408 FILS_SESSION_LEN);
3409 if (os_memcmp(sm->fils_session, elems.fils_session, FILS_SESSION_LEN)
3410 != 0) {
3411 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
3412 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
3413 sm->fils_session, FILS_SESSION_LEN);
3414 return -1;
3415 }
3416
3417 /* FILS Wrapped Data */
3418 if (!sm->cur_pmksa && elems.fils_wrapped_data) {
3419 u8 rmsk[ERP_MAX_KEY_LEN];
3420 size_t rmsk_len;
3421
3422 wpa_hexdump(MSG_DEBUG, "FILS: Wrapped Data",
3423 elems.fils_wrapped_data,
3424 elems.fils_wrapped_data_len);
3425 eapol_sm_process_erp_finish(sm->eapol, elems.fils_wrapped_data,
3426 elems.fils_wrapped_data_len);
3427 if (eapol_sm_failed(sm->eapol))
3428 return -1;
3429
3430 rmsk_len = ERP_MAX_KEY_LEN;
3431 res = eapol_sm_get_key(sm->eapol, rmsk, rmsk_len);
3432 if (res == PMK_LEN) {
3433 rmsk_len = PMK_LEN;
3434 res = eapol_sm_get_key(sm->eapol, rmsk, rmsk_len);
3435 }
3436 if (res)
3437 return -1;
3438
3439 res = fils_rmsk_to_pmk(sm->key_mgmt, rmsk, rmsk_len,
3440 sm->fils_nonce, sm->fils_anonce, NULL, 0,
3441 sm->pmk, &sm->pmk_len);
3442 os_memset(rmsk, 0, sizeof(rmsk));
3443 if (res)
3444 return -1;
3445
3446 if (!sm->fils_erp_pmkid_set) {
3447 wpa_printf(MSG_DEBUG, "FILS: PMKID not available");
3448 return -1;
3449 }
3450 wpa_hexdump(MSG_DEBUG, "FILS: PMKID", sm->fils_erp_pmkid,
3451 PMKID_LEN);
3452 wpa_printf(MSG_DEBUG, "FILS: ERP processing succeeded - add PMKSA cache entry for the result");
3453 sm->cur_pmksa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len,
3454 sm->fils_erp_pmkid, NULL, 0,
3455 sm->bssid, sm->own_addr,
3456 sm->network_ctx, sm->key_mgmt);
3457 }
3458
3459 if (!sm->cur_pmksa) {
3460 wpa_printf(MSG_DEBUG,
3461 "FILS: No remaining options to continue FILS authentication");
3462 return -1;
3463 }
3464
3465 if (fils_pmk_to_ptk(sm->pmk, sm->pmk_len, sm->own_addr, sm->bssid,
3466 sm->fils_nonce, sm->fils_anonce, &sm->ptk,
3467 ick, &ick_len, sm->key_mgmt, sm->pairwise_cipher) <
3468 0) {
3469 wpa_printf(MSG_DEBUG, "FILS: Failed to derive PTK");
3470 return -1;
3471 }
3472 sm->ptk_set = 1;
3473 sm->tptk_set = 0;
3474 os_memset(&sm->tptk, 0, sizeof(sm->tptk));
3475
3476 res = fils_key_auth_sk(ick, ick_len, sm->fils_nonce,
3477 sm->fils_anonce, sm->own_addr, sm->bssid,
3478 NULL, 0, NULL, 0, /* TODO: SK+PFS */
3479 sm->key_mgmt, sm->fils_key_auth_sta,
3480 sm->fils_key_auth_ap,
3481 &sm->fils_key_auth_len);
3482 os_memset(ick, 0, sizeof(ick));
3483 return res;
3484 }
3485
3486
fils_build_assoc_req(struct wpa_sm * sm,const u8 ** kek,size_t * kek_len,const u8 ** snonce,const u8 ** anonce,const struct wpabuf ** hlp,unsigned int num_hlp)3487 struct wpabuf * fils_build_assoc_req(struct wpa_sm *sm, const u8 **kek,
3488 size_t *kek_len, const u8 **snonce,
3489 const u8 **anonce,
3490 const struct wpabuf **hlp,
3491 unsigned int num_hlp)
3492 {
3493 struct wpabuf *buf;
3494 size_t len;
3495 unsigned int i;
3496
3497 len = 1000;
3498 for (i = 0; hlp && i < num_hlp; i++)
3499 len += 10 + wpabuf_len(hlp[i]);
3500 buf = wpabuf_alloc(len);
3501 if (!buf)
3502 return NULL;
3503
3504 /* FILS Session */
3505 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
3506 wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN); /* Length */
3507 /* Element ID Extension */
3508 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION);
3509 wpabuf_put_data(buf, sm->fils_session, FILS_SESSION_LEN);
3510
3511 /* Everything after FILS Session element gets encrypted in the driver
3512 * with KEK. The buffer returned from here is the plaintext version. */
3513
3514 /* TODO: FILS Public Key */
3515
3516 /* FILS Key Confirm */
3517 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
3518 wpabuf_put_u8(buf, 1 + sm->fils_key_auth_len); /* Length */
3519 /* Element ID Extension */
3520 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_KEY_CONFIRM);
3521 wpabuf_put_data(buf, sm->fils_key_auth_sta, sm->fils_key_auth_len);
3522
3523 /* FILS HLP Container */
3524 for (i = 0; hlp && i < num_hlp; i++) {
3525 const u8 *pos = wpabuf_head(hlp[i]);
3526 size_t left = wpabuf_len(hlp[i]);
3527
3528 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
3529 if (left <= 254)
3530 len = 1 + left;
3531 else
3532 len = 255;
3533 wpabuf_put_u8(buf, len); /* Length */
3534 /* Element ID Extension */
3535 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_HLP_CONTAINER);
3536 /* Destination MAC Address, Source MAC Address, HLP Packet.
3537 * HLP Packet is in MSDU format (i.e., included the LLC/SNAP
3538 * header when LPD is used). */
3539 wpabuf_put_data(buf, pos, len - 1);
3540 pos += len - 1;
3541 left -= len - 1;
3542 while (left) {
3543 wpabuf_put_u8(buf, WLAN_EID_FRAGMENT);
3544 len = left > 255 ? 255 : left;
3545 wpabuf_put_u8(buf, len);
3546 wpabuf_put_data(buf, pos, len);
3547 pos += len;
3548 left -= len;
3549 }
3550 }
3551
3552 /* TODO: FILS IP Address Assignment */
3553
3554 wpa_hexdump_buf(MSG_DEBUG, "FILS: Association Request plaintext", buf);
3555
3556 *kek = sm->ptk.kek;
3557 *kek_len = sm->ptk.kek_len;
3558 wpa_hexdump_key(MSG_DEBUG, "FILS: KEK for AEAD", *kek, *kek_len);
3559 *snonce = sm->fils_nonce;
3560 wpa_hexdump(MSG_DEBUG, "FILS: SNonce for AEAD AAD",
3561 *snonce, FILS_NONCE_LEN);
3562 *anonce = sm->fils_anonce;
3563 wpa_hexdump(MSG_DEBUG, "FILS: ANonce for AEAD AAD",
3564 *anonce, FILS_NONCE_LEN);
3565
3566 return buf;
3567 }
3568
3569
fils_process_hlp_resp(struct wpa_sm * sm,const u8 * resp,size_t len)3570 static void fils_process_hlp_resp(struct wpa_sm *sm, const u8 *resp, size_t len)
3571 {
3572 const u8 *pos, *end;
3573
3574 wpa_hexdump(MSG_MSGDUMP, "FILS: HLP response", resp, len);
3575 if (len < 2 * ETH_ALEN)
3576 return;
3577 pos = resp + 2 * ETH_ALEN;
3578 end = resp + len;
3579 if (end - pos >= 6 &&
3580 os_memcmp(pos, "\xaa\xaa\x03\x00\x00\x00", 6) == 0)
3581 pos += 6; /* Remove SNAP/LLC header */
3582 wpa_sm_fils_hlp_rx(sm, resp, resp + ETH_ALEN, pos, end - pos);
3583 }
3584
3585
fils_process_hlp_container(struct wpa_sm * sm,const u8 * pos,size_t len)3586 static void fils_process_hlp_container(struct wpa_sm *sm, const u8 *pos,
3587 size_t len)
3588 {
3589 const u8 *end = pos + len;
3590 u8 *tmp, *tmp_pos;
3591
3592 /* Check if there are any FILS HLP Container elements */
3593 while (end - pos >= 2) {
3594 if (2 + pos[1] > end - pos)
3595 return;
3596 if (pos[0] == WLAN_EID_EXTENSION &&
3597 pos[1] >= 1 + 2 * ETH_ALEN &&
3598 pos[2] == WLAN_EID_EXT_FILS_HLP_CONTAINER)
3599 break;
3600 pos += 2 + pos[1];
3601 }
3602 if (end - pos < 2)
3603 return; /* No FILS HLP Container elements */
3604
3605 tmp = os_malloc(end - pos);
3606 if (!tmp)
3607 return;
3608
3609 while (end - pos >= 2) {
3610 if (2 + pos[1] > end - pos ||
3611 pos[0] != WLAN_EID_EXTENSION ||
3612 pos[1] < 1 + 2 * ETH_ALEN ||
3613 pos[2] != WLAN_EID_EXT_FILS_HLP_CONTAINER)
3614 break;
3615 tmp_pos = tmp;
3616 os_memcpy(tmp_pos, pos + 3, pos[1] - 1);
3617 tmp_pos += pos[1] - 1;
3618 pos += 2 + pos[1];
3619
3620 /* Add possible fragments */
3621 while (end - pos >= 2 && pos[0] == WLAN_EID_FRAGMENT &&
3622 2 + pos[1] <= end - pos) {
3623 os_memcpy(tmp_pos, pos + 2, pos[1]);
3624 tmp_pos += pos[1];
3625 pos += 2 + pos[1];
3626 }
3627
3628 fils_process_hlp_resp(sm, tmp, tmp_pos - tmp);
3629 }
3630
3631 os_free(tmp);
3632 }
3633
3634
fils_process_assoc_resp(struct wpa_sm * sm,const u8 * resp,size_t len)3635 int fils_process_assoc_resp(struct wpa_sm *sm, const u8 *resp, size_t len)
3636 {
3637 const struct ieee80211_mgmt *mgmt;
3638 const u8 *end, *ie_start;
3639 struct ieee802_11_elems elems;
3640 int keylen, rsclen;
3641 enum wpa_alg alg;
3642 struct wpa_gtk_data gd;
3643 int maxkeylen;
3644 struct wpa_eapol_ie_parse kde;
3645
3646 if (!sm || !sm->ptk_set) {
3647 wpa_printf(MSG_DEBUG, "FILS: No KEK available");
3648 return -1;
3649 }
3650
3651 if (!wpa_key_mgmt_fils(sm->key_mgmt)) {
3652 wpa_printf(MSG_DEBUG, "FILS: Not a FILS AKM");
3653 return -1;
3654 }
3655
3656 wpa_hexdump(MSG_DEBUG, "FILS: (Re)Association Response frame",
3657 resp, len);
3658
3659 mgmt = (const struct ieee80211_mgmt *) resp;
3660 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_resp))
3661 return -1;
3662
3663 end = resp + len;
3664 /* Same offset for Association Response and Reassociation Response */
3665 ie_start = mgmt->u.assoc_resp.variable;
3666
3667 if (ieee802_11_parse_elems(ie_start, end - ie_start, &elems, 1) ==
3668 ParseFailed) {
3669 wpa_printf(MSG_DEBUG,
3670 "FILS: Failed to parse decrypted elements");
3671 goto fail;
3672 }
3673
3674 if (!elems.fils_session) {
3675 wpa_printf(MSG_DEBUG, "FILS: No FILS Session element");
3676 return -1;
3677 }
3678 if (os_memcmp(elems.fils_session, sm->fils_session,
3679 FILS_SESSION_LEN) != 0) {
3680 wpa_printf(MSG_DEBUG, "FILS: FILS Session mismatch");
3681 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
3682 elems.fils_session, FILS_SESSION_LEN);
3683 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
3684 sm->fils_session, FILS_SESSION_LEN);
3685 }
3686
3687 /* TODO: FILS Public Key */
3688
3689 if (!elems.fils_key_confirm) {
3690 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
3691 goto fail;
3692 }
3693 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
3694 wpa_printf(MSG_DEBUG,
3695 "FILS: Unexpected Key-Auth length %d (expected %d)",
3696 elems.fils_key_confirm_len,
3697 (int) sm->fils_key_auth_len);
3698 goto fail;
3699 }
3700 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_ap,
3701 sm->fils_key_auth_len) != 0) {
3702 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
3703 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
3704 elems.fils_key_confirm,
3705 elems.fils_key_confirm_len);
3706 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
3707 sm->fils_key_auth_ap, sm->fils_key_auth_len);
3708 goto fail;
3709 }
3710
3711 /* Key Delivery */
3712 if (!elems.key_delivery) {
3713 wpa_printf(MSG_DEBUG, "FILS: No Key Delivery element");
3714 goto fail;
3715 }
3716
3717 /* Parse GTK and set the key to the driver */
3718 os_memset(&gd, 0, sizeof(gd));
3719 if (wpa_supplicant_parse_ies(elems.key_delivery + WPA_KEY_RSC_LEN,
3720 elems.key_delivery_len - WPA_KEY_RSC_LEN,
3721 &kde) < 0) {
3722 wpa_printf(MSG_DEBUG, "FILS: Failed to parse KDEs");
3723 goto fail;
3724 }
3725 if (!kde.gtk) {
3726 wpa_printf(MSG_DEBUG, "FILS: No GTK KDE");
3727 goto fail;
3728 }
3729 maxkeylen = gd.gtk_len = kde.gtk_len - 2;
3730 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
3731 gd.gtk_len, maxkeylen,
3732 &gd.key_rsc_len, &gd.alg))
3733 goto fail;
3734
3735 wpa_hexdump_key(MSG_DEBUG, "FILS: Received GTK", kde.gtk, kde.gtk_len);
3736 gd.keyidx = kde.gtk[0] & 0x3;
3737 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
3738 !!(kde.gtk[0] & BIT(2)));
3739 if (kde.gtk_len - 2 > sizeof(gd.gtk)) {
3740 wpa_printf(MSG_DEBUG, "FILS: Too long GTK in GTK KDE (len=%lu)",
3741 (unsigned long) kde.gtk_len - 2);
3742 goto fail;
3743 }
3744 os_memcpy(gd.gtk, kde.gtk + 2, kde.gtk_len - 2);
3745
3746 wpa_printf(MSG_DEBUG, "FILS: Set GTK to driver");
3747 if (wpa_supplicant_install_gtk(sm, &gd, elems.key_delivery) < 0) {
3748 wpa_printf(MSG_DEBUG, "FILS: Failed to set GTK");
3749 goto fail;
3750 }
3751
3752 if (ieee80211w_set_keys(sm, &kde) < 0) {
3753 wpa_printf(MSG_DEBUG, "FILS: Failed to set IGTK");
3754 goto fail;
3755 }
3756
3757 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
3758 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
3759 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher);
3760 wpa_hexdump_key(MSG_DEBUG, "FILS: Set TK to driver",
3761 sm->ptk.tk, keylen);
3762 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, null_rsc, rsclen,
3763 sm->ptk.tk, keylen) < 0) {
3764 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
3765 "FILS: Failed to set PTK to the driver (alg=%d keylen=%d bssid="
3766 MACSTR ")",
3767 alg, keylen, MAC2STR(sm->bssid));
3768 goto fail;
3769 }
3770
3771 /* TODO: TK could be cleared after auth frame exchange now that driver
3772 * takes care of association frame encryption/decryption. */
3773 /* TK is not needed anymore in supplicant */
3774 os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
3775
3776 /* FILS HLP Container */
3777 fils_process_hlp_container(sm, ie_start, end - ie_start);
3778
3779 /* TODO: FILS IP Address Assignment */
3780
3781 wpa_printf(MSG_DEBUG, "FILS: Auth+Assoc completed successfully");
3782 sm->fils_completed = 1;
3783
3784 return 0;
3785 fail:
3786 return -1;
3787 }
3788
3789 #endif /* CONFIG_FILS */
3790
3791
wpa_fils_is_completed(struct wpa_sm * sm)3792 int wpa_fils_is_completed(struct wpa_sm *sm)
3793 {
3794 #ifdef CONFIG_FILS
3795 return sm && sm->fils_completed;
3796 #else /* CONFIG_FILS */
3797 return 0;
3798 #endif /* CONFIG_FILS */
3799 }
3800