Line data Source code
1 : /*
2 : * WPA Supplicant - Mesh RSN routines
3 : * Copyright (c) 2013-2014, cozybit, Inc. All rights reserved.
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "utils/includes.h"
10 :
11 : #include "utils/common.h"
12 : #include "utils/eloop.h"
13 : #include "crypto/sha256.h"
14 : #include "crypto/random.h"
15 : #include "crypto/aes.h"
16 : #include "crypto/aes_siv.h"
17 : #include "rsn_supp/wpa.h"
18 : #include "ap/hostapd.h"
19 : #include "ap/wpa_auth.h"
20 : #include "ap/sta_info.h"
21 : #include "ap/ieee802_11.h"
22 : #include "wpa_supplicant_i.h"
23 : #include "driver_i.h"
24 : #include "wpas_glue.h"
25 : #include "mesh_mpm.h"
26 : #include "mesh_rsn.h"
27 :
28 : #define MESH_AUTH_TIMEOUT 10
29 : #define MESH_AUTH_RETRY 3
30 : #define MESH_AUTH_BLOCK_DURATION 3600
31 :
32 12 : void mesh_auth_timer(void *eloop_ctx, void *user_data)
33 : {
34 12 : struct wpa_supplicant *wpa_s = eloop_ctx;
35 12 : struct sta_info *sta = user_data;
36 :
37 12 : if (sta->sae->state != SAE_ACCEPTED) {
38 84 : wpa_printf(MSG_DEBUG, "AUTH: Re-authenticate with " MACSTR
39 : " (attempt %d) ",
40 84 : MAC2STR(sta->addr), sta->sae_auth_retry);
41 72 : wpa_msg(wpa_s, MSG_INFO, MESH_SAE_AUTH_FAILURE "addr=" MACSTR,
42 72 : MAC2STR(sta->addr));
43 12 : if (sta->sae_auth_retry < MESH_AUTH_RETRY) {
44 10 : mesh_rsn_auth_sae_sta(wpa_s, sta);
45 : } else {
46 2 : if (sta->sae_auth_retry > MESH_AUTH_RETRY) {
47 0 : ap_free_sta(wpa_s->ifmsh->bss[0], sta);
48 12 : return;
49 : }
50 :
51 : /* block the STA if exceeded the number of attempts */
52 2 : wpa_mesh_set_plink_state(wpa_s, sta, PLINK_BLOCKED);
53 2 : sta->sae->state = SAE_NOTHING;
54 2 : if (wpa_s->mesh_auth_block_duration <
55 : MESH_AUTH_BLOCK_DURATION)
56 2 : wpa_s->mesh_auth_block_duration += 60;
57 2 : eloop_register_timeout(wpa_s->mesh_auth_block_duration,
58 : 0, mesh_auth_timer, wpa_s, sta);
59 14 : wpa_msg(wpa_s, MSG_INFO, MESH_SAE_AUTH_BLOCKED "addr="
60 : MACSTR " duration=%d",
61 12 : MAC2STR(sta->addr),
62 : wpa_s->mesh_auth_block_duration);
63 : }
64 12 : sta->sae_auth_retry++;
65 : }
66 : }
67 :
68 :
69 8 : static void auth_logger(void *ctx, const u8 *addr, logger_level level,
70 : const char *txt)
71 : {
72 8 : if (addr)
73 48 : wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
74 48 : MAC2STR(addr), txt);
75 : else
76 0 : wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
77 8 : }
78 :
79 :
80 0 : static const u8 *auth_get_psk(void *ctx, const u8 *addr,
81 : const u8 *p2p_dev_addr, const u8 *prev_psk)
82 : {
83 0 : struct mesh_rsn *mesh_rsn = ctx;
84 0 : struct hostapd_data *hapd = mesh_rsn->wpa_s->ifmsh->bss[0];
85 0 : struct sta_info *sta = ap_get_sta(hapd, addr);
86 :
87 0 : wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
88 0 : __func__, MAC2STR(addr), prev_psk);
89 :
90 0 : if (sta && sta->auth_alg == WLAN_AUTH_SAE) {
91 0 : if (!sta->sae || prev_psk)
92 0 : return NULL;
93 0 : return sta->sae->pmk;
94 : }
95 :
96 0 : return NULL;
97 : }
98 :
99 :
100 8 : static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
101 : const u8 *addr, int idx, u8 *key, size_t key_len)
102 : {
103 8 : struct mesh_rsn *mesh_rsn = ctx;
104 : u8 seq[6];
105 :
106 8 : os_memset(seq, 0, sizeof(seq));
107 :
108 8 : if (addr) {
109 48 : wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
110 : " key_idx=%d)",
111 48 : __func__, alg, MAC2STR(addr), idx);
112 : } else {
113 0 : wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
114 : __func__, alg, idx);
115 : }
116 8 : wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
117 :
118 8 : return wpa_drv_set_key(mesh_rsn->wpa_s, alg, addr, idx,
119 : 1, seq, 6, key, key_len);
120 : }
121 :
122 :
123 8 : static int auth_start_ampe(void *ctx, const u8 *addr)
124 : {
125 8 : struct mesh_rsn *mesh_rsn = ctx;
126 : struct hostapd_data *hapd;
127 : struct sta_info *sta;
128 :
129 8 : if (mesh_rsn->wpa_s->current_ssid->mode != WPAS_MODE_MESH)
130 0 : return -1;
131 :
132 8 : hapd = mesh_rsn->wpa_s->ifmsh->bss[0];
133 8 : sta = ap_get_sta(hapd, addr);
134 8 : if (sta)
135 8 : eloop_cancel_timeout(mesh_auth_timer, mesh_rsn->wpa_s, sta);
136 :
137 8 : mesh_mpm_auth_peer(mesh_rsn->wpa_s, addr);
138 8 : return 0;
139 : }
140 :
141 :
142 12 : static int __mesh_rsn_auth_init(struct mesh_rsn *rsn, const u8 *addr)
143 : {
144 : struct wpa_auth_config conf;
145 : struct wpa_auth_callbacks cb;
146 12 : u8 seq[6] = {};
147 :
148 12 : wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
149 :
150 12 : os_memset(&conf, 0, sizeof(conf));
151 12 : conf.wpa = 2;
152 12 : conf.wpa_key_mgmt = WPA_KEY_MGMT_SAE;
153 12 : conf.wpa_pairwise = WPA_CIPHER_CCMP;
154 12 : conf.rsn_pairwise = WPA_CIPHER_CCMP;
155 12 : conf.wpa_group = WPA_CIPHER_CCMP;
156 12 : conf.eapol_version = 0;
157 12 : conf.wpa_group_rekey = -1;
158 :
159 12 : os_memset(&cb, 0, sizeof(cb));
160 12 : cb.ctx = rsn;
161 12 : cb.logger = auth_logger;
162 12 : cb.get_psk = auth_get_psk;
163 12 : cb.set_key = auth_set_key;
164 12 : cb.start_ampe = auth_start_ampe;
165 :
166 12 : rsn->auth = wpa_init(addr, &conf, &cb);
167 12 : if (rsn->auth == NULL) {
168 0 : wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
169 0 : return -1;
170 : }
171 :
172 : /* TODO: support rekeying */
173 12 : if (random_get_bytes(rsn->mgtk, 16) < 0) {
174 0 : wpa_deinit(rsn->auth);
175 0 : return -1;
176 : }
177 :
178 : /* group mgmt */
179 12 : wpa_drv_set_key(rsn->wpa_s, WPA_ALG_IGTK, NULL, 4, 1,
180 12 : seq, sizeof(seq), rsn->mgtk, sizeof(rsn->mgtk));
181 :
182 : /* group privacy / data frames */
183 12 : wpa_drv_set_key(rsn->wpa_s, WPA_ALG_CCMP, NULL, 1, 1,
184 12 : seq, sizeof(seq), rsn->mgtk, sizeof(rsn->mgtk));
185 :
186 12 : return 0;
187 : }
188 :
189 :
190 0 : static void mesh_rsn_deinit(struct mesh_rsn *rsn)
191 : {
192 0 : os_memset(rsn->mgtk, 0, sizeof(rsn->mgtk));
193 0 : wpa_deinit(rsn->auth);
194 0 : }
195 :
196 :
197 12 : struct mesh_rsn *mesh_rsn_auth_init(struct wpa_supplicant *wpa_s,
198 : struct mesh_conf *conf)
199 : {
200 : struct mesh_rsn *mesh_rsn;
201 12 : struct hostapd_data *bss = wpa_s->ifmsh->bss[0];
202 : const u8 *ie;
203 : size_t ie_len;
204 :
205 12 : mesh_rsn = os_zalloc(sizeof(*mesh_rsn));
206 12 : if (mesh_rsn == NULL)
207 0 : return NULL;
208 12 : mesh_rsn->wpa_s = wpa_s;
209 :
210 12 : if (__mesh_rsn_auth_init(mesh_rsn, wpa_s->own_addr) < 0) {
211 0 : mesh_rsn_deinit(mesh_rsn);
212 0 : return NULL;
213 : }
214 :
215 12 : bss->wpa_auth = mesh_rsn->auth;
216 :
217 12 : ie = wpa_auth_get_wpa_ie(mesh_rsn->auth, &ie_len);
218 12 : conf->ies = (u8 *) ie;
219 12 : conf->ie_len = ie_len;
220 :
221 12 : wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
222 :
223 12 : return mesh_rsn;
224 : }
225 :
226 :
227 27 : static int index_within_array(const int *array, int idx)
228 : {
229 : int i;
230 :
231 27 : for (i = 0; i < idx; i++) {
232 0 : if (array[i] == -1)
233 0 : return 0;
234 : }
235 :
236 27 : return 1;
237 : }
238 :
239 :
240 27 : static int mesh_rsn_sae_group(struct wpa_supplicant *wpa_s,
241 : struct sae_data *sae)
242 : {
243 27 : int *groups = wpa_s->ifmsh->bss[0]->conf->sae_groups;
244 :
245 : /* Configuration may have changed, so validate current index */
246 27 : if (!index_within_array(groups, wpa_s->mesh_rsn->sae_group_index))
247 0 : return -1;
248 :
249 : for (;;) {
250 27 : int group = groups[wpa_s->mesh_rsn->sae_group_index];
251 :
252 27 : if (group <= 0)
253 0 : break;
254 27 : if (sae_set_group(sae, group) == 0) {
255 27 : wpa_dbg(wpa_s, MSG_DEBUG, "SME: Selected SAE group %d",
256 : sae->group);
257 27 : return 0;
258 : }
259 0 : wpa_s->mesh_rsn->sae_group_index++;
260 0 : }
261 :
262 0 : return -1;
263 : }
264 :
265 :
266 27 : static int mesh_rsn_build_sae_commit(struct wpa_supplicant *wpa_s,
267 : struct wpa_ssid *ssid,
268 : struct sta_info *sta)
269 : {
270 27 : if (ssid->passphrase == NULL) {
271 0 : wpa_msg(wpa_s, MSG_DEBUG, "SAE: No password available");
272 0 : return -1;
273 : }
274 :
275 27 : if (mesh_rsn_sae_group(wpa_s, sta->sae) < 0) {
276 0 : wpa_msg(wpa_s, MSG_DEBUG, "SAE: Failed to select group");
277 0 : return -1;
278 : }
279 :
280 81 : return sae_prepare_commit(wpa_s->own_addr, sta->addr,
281 27 : (u8 *) ssid->passphrase,
282 27 : os_strlen(ssid->passphrase), sta->sae);
283 : }
284 :
285 :
286 : /* initiate new SAE authentication with sta */
287 27 : int mesh_rsn_auth_sae_sta(struct wpa_supplicant *wpa_s,
288 : struct sta_info *sta)
289 : {
290 27 : struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
291 27 : struct wpa_ssid *ssid = wpa_s->current_ssid;
292 : unsigned int rnd;
293 : int ret;
294 :
295 27 : if (!ssid) {
296 0 : wpa_msg(wpa_s, MSG_DEBUG,
297 : "AUTH: No current_ssid known to initiate new SAE");
298 0 : return -1;
299 : }
300 :
301 27 : if (!sta->sae) {
302 17 : sta->sae = os_zalloc(sizeof(*sta->sae));
303 17 : if (sta->sae == NULL)
304 0 : return -1;
305 : }
306 :
307 27 : if (mesh_rsn_build_sae_commit(wpa_s, ssid, sta))
308 0 : return -1;
309 :
310 162 : wpa_msg(wpa_s, MSG_DEBUG,
311 : "AUTH: started authentication with SAE peer: " MACSTR,
312 162 : MAC2STR(sta->addr));
313 :
314 27 : wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
315 27 : ret = auth_sae_init_committed(hapd, sta);
316 27 : if (ret)
317 0 : return ret;
318 :
319 27 : eloop_cancel_timeout(mesh_auth_timer, wpa_s, sta);
320 27 : rnd = rand() % MESH_AUTH_TIMEOUT;
321 27 : eloop_register_timeout(MESH_AUTH_TIMEOUT + rnd, 0, mesh_auth_timer,
322 : wpa_s, sta);
323 27 : return 0;
324 : }
325 :
326 :
327 38 : void mesh_rsn_get_pmkid(struct mesh_rsn *rsn, struct sta_info *sta, u8 *pmkid)
328 : {
329 : /* don't expect wpa auth to cache the pmkid for now */
330 76 : rsn_pmkid(sta->sae->pmk, PMK_LEN, rsn->wpa_s->own_addr,
331 38 : sta->addr, pmkid,
332 : wpa_key_mgmt_sha256(wpa_auth_sta_key_mgmt(sta->wpa_sm)));
333 38 : }
334 :
335 :
336 : static void
337 8 : mesh_rsn_derive_aek(struct mesh_rsn *rsn, struct sta_info *sta)
338 : {
339 8 : u8 *myaddr = rsn->wpa_s->own_addr;
340 8 : u8 *peer = sta->addr;
341 8 : u8 *addr1 = peer, *addr2 = myaddr;
342 : u8 context[AES_BLOCK_SIZE];
343 :
344 : /* SAE */
345 8 : RSN_SELECTOR_PUT(context, wpa_cipher_to_suite(0, WPA_CIPHER_GCMP));
346 :
347 8 : if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
348 4 : addr1 = myaddr;
349 4 : addr2 = peer;
350 : }
351 8 : os_memcpy(context + 4, addr1, ETH_ALEN);
352 8 : os_memcpy(context + 10, addr2, ETH_ALEN);
353 :
354 8 : sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk), "AEK Derivation",
355 8 : context, sizeof(context), sta->aek, sizeof(sta->aek));
356 8 : }
357 :
358 :
359 : /* derive mesh temporal key from pmk */
360 8 : int mesh_rsn_derive_mtk(struct wpa_supplicant *wpa_s, struct sta_info *sta)
361 : {
362 : u8 *ptr;
363 : u8 *min, *max;
364 : u16 min_lid, max_lid;
365 8 : size_t nonce_len = sizeof(sta->my_nonce);
366 8 : size_t lid_len = sizeof(sta->my_lid);
367 8 : u8 *myaddr = wpa_s->own_addr;
368 8 : u8 *peer = sta->addr;
369 : /* 2 nonces, 2 linkids, akm suite, 2 mac addrs */
370 : u8 context[64 + 4 + 4 + 12];
371 :
372 8 : ptr = context;
373 8 : if (os_memcmp(sta->my_nonce, sta->peer_nonce, nonce_len) < 0) {
374 4 : min = sta->my_nonce;
375 4 : max = sta->peer_nonce;
376 : } else {
377 4 : min = sta->peer_nonce;
378 4 : max = sta->my_nonce;
379 : }
380 8 : os_memcpy(ptr, min, nonce_len);
381 8 : os_memcpy(ptr + nonce_len, max, nonce_len);
382 8 : ptr += 2 * nonce_len;
383 :
384 8 : if (sta->my_lid < sta->peer_lid) {
385 4 : min_lid = host_to_le16(sta->my_lid);
386 4 : max_lid = host_to_le16(sta->peer_lid);
387 : } else {
388 4 : min_lid = host_to_le16(sta->peer_lid);
389 4 : max_lid = host_to_le16(sta->my_lid);
390 : }
391 8 : os_memcpy(ptr, &min_lid, lid_len);
392 8 : os_memcpy(ptr + lid_len, &max_lid, lid_len);
393 8 : ptr += 2 * lid_len;
394 :
395 : /* SAE */
396 8 : RSN_SELECTOR_PUT(ptr, wpa_cipher_to_suite(0, WPA_CIPHER_GCMP));
397 8 : ptr += 4;
398 :
399 8 : if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
400 4 : min = myaddr;
401 4 : max = peer;
402 : } else {
403 4 : min = peer;
404 4 : max = myaddr;
405 : }
406 8 : os_memcpy(ptr, min, ETH_ALEN);
407 8 : os_memcpy(ptr + ETH_ALEN, max, ETH_ALEN);
408 :
409 8 : sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk),
410 : "Temporal Key Derivation", context, sizeof(context),
411 8 : sta->mtk, sizeof(sta->mtk));
412 8 : return 0;
413 : }
414 :
415 :
416 8 : void mesh_rsn_init_ampe_sta(struct wpa_supplicant *wpa_s, struct sta_info *sta)
417 : {
418 8 : if (random_get_bytes(sta->my_nonce, 32) < 0) {
419 0 : wpa_printf(MSG_INFO, "mesh: Failed to derive random nonce");
420 : /* TODO: How to handle this more cleanly? */
421 : }
422 8 : os_memset(sta->peer_nonce, 0, 32);
423 8 : mesh_rsn_derive_aek(wpa_s->mesh_rsn, sta);
424 8 : }
425 :
426 :
427 : /* insert AMPE and encrypted MIC at @ie.
428 : * @mesh_rsn: mesh RSN context
429 : * @sta: STA we're sending to
430 : * @cat: pointer to category code in frame header.
431 : * @buf: wpabuf to add encrypted AMPE and MIC to.
432 : * */
433 38 : int mesh_rsn_protect_frame(struct mesh_rsn *rsn, struct sta_info *sta,
434 : const u8 *cat, struct wpabuf *buf)
435 : {
436 : struct ieee80211_ampe_ie *ampe;
437 38 : u8 const *ie = wpabuf_head_u8(buf) + wpabuf_len(buf);
438 38 : u8 *ampe_ie = NULL, *mic_ie = NULL, *mic_payload;
439 38 : const u8 *aad[] = { rsn->wpa_s->own_addr, sta->addr, cat };
440 38 : const size_t aad_len[] = { ETH_ALEN, ETH_ALEN, ie - cat };
441 38 : int ret = 0;
442 :
443 38 : if (AES_BLOCK_SIZE + 2 + sizeof(*ampe) + 2 > wpabuf_tailroom(buf)) {
444 0 : wpa_printf(MSG_ERROR, "protect frame: buffer too small");
445 0 : return -EINVAL;
446 : }
447 :
448 38 : ampe_ie = os_zalloc(2 + sizeof(*ampe));
449 38 : if (!ampe_ie) {
450 0 : wpa_printf(MSG_ERROR, "protect frame: out of memory");
451 0 : return -ENOMEM;
452 : }
453 :
454 38 : mic_ie = os_zalloc(2 + AES_BLOCK_SIZE);
455 38 : if (!mic_ie) {
456 0 : wpa_printf(MSG_ERROR, "protect frame: out of memory");
457 0 : ret = -ENOMEM;
458 0 : goto free;
459 : }
460 :
461 : /* IE: AMPE */
462 38 : ampe_ie[0] = WLAN_EID_AMPE;
463 38 : ampe_ie[1] = sizeof(*ampe);
464 38 : ampe = (struct ieee80211_ampe_ie *) (ampe_ie + 2);
465 :
466 38 : RSN_SELECTOR_PUT(ampe->selected_pairwise_suite,
467 : wpa_cipher_to_suite(WPA_PROTO_RSN, WPA_CIPHER_CCMP));
468 38 : os_memcpy(ampe->local_nonce, sta->my_nonce, 32);
469 38 : os_memcpy(ampe->peer_nonce, sta->peer_nonce, 32);
470 : /* incomplete: see 13.5.4 */
471 : /* TODO: static mgtk for now since we don't support rekeying! */
472 38 : os_memcpy(ampe->mgtk, rsn->mgtk, 16);
473 : /* TODO: Populate Key RSC */
474 : /* expire in 13 decades or so */
475 38 : os_memset(ampe->key_expiration, 0xff, 4);
476 :
477 : /* IE: MIC */
478 38 : mic_ie[0] = WLAN_EID_MIC;
479 38 : mic_ie[1] = AES_BLOCK_SIZE;
480 38 : wpabuf_put_data(buf, mic_ie, 2);
481 : /* MIC field is output ciphertext */
482 :
483 : /* encrypt after MIC */
484 38 : mic_payload = (u8 *) wpabuf_put(buf, 2 + sizeof(*ampe) +
485 : AES_BLOCK_SIZE);
486 :
487 38 : if (aes_siv_encrypt(sta->aek, ampe_ie, 2 + sizeof(*ampe), 3,
488 : aad, aad_len, mic_payload)) {
489 0 : wpa_printf(MSG_ERROR, "protect frame: failed to encrypt");
490 0 : ret = -ENOMEM;
491 0 : goto free;
492 : }
493 :
494 : free:
495 38 : os_free(ampe_ie);
496 38 : os_free(mic_ie);
497 :
498 38 : return ret;
499 : }
500 :
501 :
502 20 : int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta,
503 : struct ieee802_11_elems *elems, const u8 *cat,
504 : const u8 *start, size_t elems_len)
505 : {
506 20 : int ret = 0;
507 : struct ieee80211_ampe_ie *ampe;
508 20 : u8 null_nonce[32] = {};
509 : u8 ampe_eid;
510 : u8 ampe_ie_len;
511 20 : u8 *ampe_buf, *crypt = NULL;
512 : size_t crypt_len;
513 20 : const u8 *aad[] = { sta->addr, wpa_s->own_addr, cat };
514 40 : const size_t aad_len[] = { ETH_ALEN, ETH_ALEN,
515 20 : (elems->mic - 2) - cat };
516 :
517 20 : if (!elems->mic || elems->mic_len < AES_BLOCK_SIZE) {
518 0 : wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing mic ie");
519 0 : return -1;
520 : }
521 :
522 20 : ampe_buf = (u8 *) elems->mic + elems->mic_len;
523 20 : if ((int) elems_len < ampe_buf - start)
524 0 : return -1;
525 :
526 20 : crypt_len = elems_len - (elems->mic - start);
527 20 : if (crypt_len < 2) {
528 0 : wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing ampe ie");
529 0 : return -1;
530 : }
531 :
532 : /* crypt is modified by siv_decrypt */
533 20 : crypt = os_zalloc(crypt_len);
534 20 : if (!crypt) {
535 0 : wpa_printf(MSG_ERROR, "Mesh RSN: out of memory");
536 0 : ret = -ENOMEM;
537 0 : goto free;
538 : }
539 :
540 20 : os_memcpy(crypt, elems->mic, crypt_len);
541 :
542 20 : if (aes_siv_decrypt(sta->aek, crypt, crypt_len, 3,
543 : aad, aad_len, ampe_buf)) {
544 0 : wpa_printf(MSG_ERROR, "Mesh RSN: frame verification failed!");
545 0 : ret = -1;
546 0 : goto free;
547 : }
548 :
549 20 : ampe_eid = *ampe_buf++;
550 20 : ampe_ie_len = *ampe_buf++;
551 :
552 20 : if (ampe_eid != WLAN_EID_AMPE ||
553 : ampe_ie_len < sizeof(struct ieee80211_ampe_ie)) {
554 0 : wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: invalid ampe ie");
555 0 : ret = -1;
556 0 : goto free;
557 : }
558 :
559 20 : ampe = (struct ieee80211_ampe_ie *) ampe_buf;
560 32 : if (os_memcmp(ampe->peer_nonce, null_nonce, 32) != 0 &&
561 12 : os_memcmp(ampe->peer_nonce, sta->my_nonce, 32) != 0) {
562 0 : wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: invalid peer nonce");
563 0 : ret = -1;
564 0 : goto free;
565 : }
566 20 : os_memcpy(sta->peer_nonce, ampe->local_nonce,
567 : sizeof(ampe->local_nonce));
568 20 : os_memcpy(sta->mgtk, ampe->mgtk, sizeof(ampe->mgtk));
569 :
570 : /* todo parse mgtk expiration */
571 : free:
572 20 : os_free(crypt);
573 20 : return ret;
574 : }
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