blob: 5d88274b8678ea914e3224f82c7e86f6f2ef223d [file] [log] [blame]
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -08001/*
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"
Dmitry Shmidtff787d52015-01-12 13:01:47 -080021#include "ap/ieee802_11.h"
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -080022#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
Dmitry Shmidt7f656022015-02-25 14:36:37 -080030#define MESH_AUTH_BLOCK_DURATION 3600
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -080031
32void mesh_auth_timer(void *eloop_ctx, void *user_data)
33{
34 struct wpa_supplicant *wpa_s = eloop_ctx;
35 struct sta_info *sta = user_data;
36
37 if (sta->sae->state != SAE_ACCEPTED) {
38 wpa_printf(MSG_DEBUG, "AUTH: Re-authenticate with " MACSTR
39 " (attempt %d) ",
40 MAC2STR(sta->addr), sta->sae_auth_retry);
Dmitry Shmidt7f656022015-02-25 14:36:37 -080041 wpa_msg(wpa_s, MSG_INFO, MESH_SAE_AUTH_FAILURE "addr=" MACSTR,
42 MAC2STR(sta->addr));
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -080043 if (sta->sae_auth_retry < MESH_AUTH_RETRY) {
44 mesh_rsn_auth_sae_sta(wpa_s, sta);
45 } else {
Dmitry Shmidt7f656022015-02-25 14:36:37 -080046 if (sta->sae_auth_retry > MESH_AUTH_RETRY) {
47 ap_free_sta(wpa_s->ifmsh->bss[0], sta);
48 return;
49 }
50
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -080051 /* block the STA if exceeded the number of attempts */
Dmitry Shmidt216983b2015-02-06 10:50:36 -080052 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_BLOCKED);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -080053 sta->sae->state = SAE_NOTHING;
Dmitry Shmidt7f656022015-02-25 14:36:37 -080054 if (wpa_s->mesh_auth_block_duration <
55 MESH_AUTH_BLOCK_DURATION)
56 wpa_s->mesh_auth_block_duration += 60;
57 eloop_register_timeout(wpa_s->mesh_auth_block_duration,
58 0, mesh_auth_timer, wpa_s, sta);
59 wpa_msg(wpa_s, MSG_INFO, MESH_SAE_AUTH_BLOCKED "addr="
60 MACSTR " duration=%d",
61 MAC2STR(sta->addr),
62 wpa_s->mesh_auth_block_duration);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -080063 }
64 sta->sae_auth_retry++;
65 }
66}
67
68
69static void auth_logger(void *ctx, const u8 *addr, logger_level level,
70 const char *txt)
71{
72 if (addr)
73 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
74 MAC2STR(addr), txt);
75 else
76 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
77}
78
79
80static const u8 *auth_get_psk(void *ctx, const u8 *addr,
81 const u8 *p2p_dev_addr, const u8 *prev_psk)
82{
83 struct mesh_rsn *mesh_rsn = ctx;
84 struct hostapd_data *hapd = mesh_rsn->wpa_s->ifmsh->bss[0];
85 struct sta_info *sta = ap_get_sta(hapd, addr);
86
87 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
88 __func__, MAC2STR(addr), prev_psk);
89
90 if (sta && sta->auth_alg == WLAN_AUTH_SAE) {
91 if (!sta->sae || prev_psk)
92 return NULL;
93 return sta->sae->pmk;
94 }
95
96 return NULL;
97}
98
99
100static 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 struct mesh_rsn *mesh_rsn = ctx;
104 u8 seq[6];
105
106 os_memset(seq, 0, sizeof(seq));
107
108 if (addr) {
109 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
110 " key_idx=%d)",
111 __func__, alg, MAC2STR(addr), idx);
112 } else {
113 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
114 __func__, alg, idx);
115 }
116 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
117
118 return wpa_drv_set_key(mesh_rsn->wpa_s, alg, addr, idx,
119 1, seq, 6, key, key_len);
120}
121
122
123static int auth_start_ampe(void *ctx, const u8 *addr)
124{
125 struct mesh_rsn *mesh_rsn = ctx;
126 struct hostapd_data *hapd;
127 struct sta_info *sta;
128
129 if (mesh_rsn->wpa_s->current_ssid->mode != WPAS_MODE_MESH)
130 return -1;
131
132 hapd = mesh_rsn->wpa_s->ifmsh->bss[0];
133 sta = ap_get_sta(hapd, addr);
134 if (sta)
135 eloop_cancel_timeout(mesh_auth_timer, mesh_rsn->wpa_s, sta);
136
137 mesh_mpm_auth_peer(mesh_rsn->wpa_s, addr);
138 return 0;
139}
140
141
142static 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 u8 seq[6] = {};
147
148 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
149
150 os_memset(&conf, 0, sizeof(conf));
151 conf.wpa = 2;
152 conf.wpa_key_mgmt = WPA_KEY_MGMT_SAE;
153 conf.wpa_pairwise = WPA_CIPHER_CCMP;
154 conf.rsn_pairwise = WPA_CIPHER_CCMP;
155 conf.wpa_group = WPA_CIPHER_CCMP;
156 conf.eapol_version = 0;
157 conf.wpa_group_rekey = -1;
158
159 os_memset(&cb, 0, sizeof(cb));
160 cb.ctx = rsn;
161 cb.logger = auth_logger;
162 cb.get_psk = auth_get_psk;
163 cb.set_key = auth_set_key;
164 cb.start_ampe = auth_start_ampe;
165
166 rsn->auth = wpa_init(addr, &conf, &cb);
167 if (rsn->auth == NULL) {
168 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
169 return -1;
170 }
171
172 /* TODO: support rekeying */
173 if (random_get_bytes(rsn->mgtk, 16) < 0) {
174 wpa_deinit(rsn->auth);
175 return -1;
176 }
177
178 /* group mgmt */
179 wpa_drv_set_key(rsn->wpa_s, WPA_ALG_IGTK, NULL, 4, 1,
180 seq, sizeof(seq), rsn->mgtk, sizeof(rsn->mgtk));
181
182 /* group privacy / data frames */
183 wpa_drv_set_key(rsn->wpa_s, WPA_ALG_CCMP, NULL, 1, 1,
184 seq, sizeof(seq), rsn->mgtk, sizeof(rsn->mgtk));
185
186 return 0;
187}
188
189
190static void mesh_rsn_deinit(struct mesh_rsn *rsn)
191{
192 os_memset(rsn->mgtk, 0, sizeof(rsn->mgtk));
Dmitry Shmidtd80a4012015-11-05 16:35:40 -0800193 if (rsn->auth)
194 wpa_deinit(rsn->auth);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800195}
196
197
198struct mesh_rsn *mesh_rsn_auth_init(struct wpa_supplicant *wpa_s,
199 struct mesh_conf *conf)
200{
201 struct mesh_rsn *mesh_rsn;
202 struct hostapd_data *bss = wpa_s->ifmsh->bss[0];
203 const u8 *ie;
204 size_t ie_len;
205
206 mesh_rsn = os_zalloc(sizeof(*mesh_rsn));
207 if (mesh_rsn == NULL)
208 return NULL;
209 mesh_rsn->wpa_s = wpa_s;
210
211 if (__mesh_rsn_auth_init(mesh_rsn, wpa_s->own_addr) < 0) {
212 mesh_rsn_deinit(mesh_rsn);
Dmitry Shmidtd80a4012015-11-05 16:35:40 -0800213 os_free(mesh_rsn);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800214 return NULL;
215 }
216
217 bss->wpa_auth = mesh_rsn->auth;
218
219 ie = wpa_auth_get_wpa_ie(mesh_rsn->auth, &ie_len);
Dmitry Shmidtd80a4012015-11-05 16:35:40 -0800220 conf->rsn_ie = (u8 *) ie;
221 conf->rsn_ie_len = ie_len;
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800222
223 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
224
225 return mesh_rsn;
226}
227
228
229static int index_within_array(const int *array, int idx)
230{
231 int i;
232
233 for (i = 0; i < idx; i++) {
234 if (array[i] == -1)
235 return 0;
236 }
237
238 return 1;
239}
240
241
242static int mesh_rsn_sae_group(struct wpa_supplicant *wpa_s,
243 struct sae_data *sae)
244{
245 int *groups = wpa_s->ifmsh->bss[0]->conf->sae_groups;
246
247 /* Configuration may have changed, so validate current index */
248 if (!index_within_array(groups, wpa_s->mesh_rsn->sae_group_index))
249 return -1;
250
251 for (;;) {
252 int group = groups[wpa_s->mesh_rsn->sae_group_index];
253
254 if (group <= 0)
255 break;
256 if (sae_set_group(sae, group) == 0) {
257 wpa_dbg(wpa_s, MSG_DEBUG, "SME: Selected SAE group %d",
258 sae->group);
259 return 0;
260 }
261 wpa_s->mesh_rsn->sae_group_index++;
262 }
263
264 return -1;
265}
266
267
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800268static int mesh_rsn_build_sae_commit(struct wpa_supplicant *wpa_s,
269 struct wpa_ssid *ssid,
270 struct sta_info *sta)
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800271{
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800272 if (ssid->passphrase == NULL) {
273 wpa_msg(wpa_s, MSG_DEBUG, "SAE: No password available");
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800274 return -1;
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800275 }
276
277 if (mesh_rsn_sae_group(wpa_s, sta->sae) < 0) {
278 wpa_msg(wpa_s, MSG_DEBUG, "SAE: Failed to select group");
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800279 return -1;
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800280 }
281
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800282 return sae_prepare_commit(wpa_s->own_addr, sta->addr,
283 (u8 *) ssid->passphrase,
284 os_strlen(ssid->passphrase), sta->sae);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800285}
286
287
288/* initiate new SAE authentication with sta */
289int mesh_rsn_auth_sae_sta(struct wpa_supplicant *wpa_s,
290 struct sta_info *sta)
291{
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800292 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800293 struct wpa_ssid *ssid = wpa_s->current_ssid;
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800294 unsigned int rnd;
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800295 int ret;
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800296
297 if (!ssid) {
298 wpa_msg(wpa_s, MSG_DEBUG,
299 "AUTH: No current_ssid known to initiate new SAE");
300 return -1;
301 }
302
303 if (!sta->sae) {
304 sta->sae = os_zalloc(sizeof(*sta->sae));
305 if (sta->sae == NULL)
306 return -1;
307 }
308
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800309 if (mesh_rsn_build_sae_commit(wpa_s, ssid, sta))
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800310 return -1;
311
312 wpa_msg(wpa_s, MSG_DEBUG,
313 "AUTH: started authentication with SAE peer: " MACSTR,
314 MAC2STR(sta->addr));
315
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800316 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
Dmitry Shmidtff787d52015-01-12 13:01:47 -0800317 ret = auth_sae_init_committed(hapd, sta);
318 if (ret)
319 return ret;
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800320
Dmitry Shmidt7f656022015-02-25 14:36:37 -0800321 eloop_cancel_timeout(mesh_auth_timer, wpa_s, sta);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800322 rnd = rand() % MESH_AUTH_TIMEOUT;
323 eloop_register_timeout(MESH_AUTH_TIMEOUT + rnd, 0, mesh_auth_timer,
324 wpa_s, sta);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800325 return 0;
326}
327
328
329void mesh_rsn_get_pmkid(struct mesh_rsn *rsn, struct sta_info *sta, u8 *pmkid)
330{
Dmitry Shmidtd97138d2015-12-28 13:27:49 -0800331 os_memcpy(pmkid, sta->sae->pmkid, SAE_PMKID_LEN);
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800332}
333
334
335static void
336mesh_rsn_derive_aek(struct mesh_rsn *rsn, struct sta_info *sta)
337{
338 u8 *myaddr = rsn->wpa_s->own_addr;
339 u8 *peer = sta->addr;
340 u8 *addr1 = peer, *addr2 = myaddr;
341 u8 context[AES_BLOCK_SIZE];
342
343 /* SAE */
344 RSN_SELECTOR_PUT(context, wpa_cipher_to_suite(0, WPA_CIPHER_GCMP));
345
346 if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
347 addr1 = myaddr;
348 addr2 = peer;
349 }
350 os_memcpy(context + 4, addr1, ETH_ALEN);
351 os_memcpy(context + 10, addr2, ETH_ALEN);
352
353 sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk), "AEK Derivation",
354 context, sizeof(context), sta->aek, sizeof(sta->aek));
355}
356
357
358/* derive mesh temporal key from pmk */
359int mesh_rsn_derive_mtk(struct wpa_supplicant *wpa_s, struct sta_info *sta)
360{
361 u8 *ptr;
362 u8 *min, *max;
363 u16 min_lid, max_lid;
364 size_t nonce_len = sizeof(sta->my_nonce);
365 size_t lid_len = sizeof(sta->my_lid);
366 u8 *myaddr = wpa_s->own_addr;
367 u8 *peer = sta->addr;
368 /* 2 nonces, 2 linkids, akm suite, 2 mac addrs */
369 u8 context[64 + 4 + 4 + 12];
370
371 ptr = context;
372 if (os_memcmp(sta->my_nonce, sta->peer_nonce, nonce_len) < 0) {
373 min = sta->my_nonce;
374 max = sta->peer_nonce;
375 } else {
376 min = sta->peer_nonce;
377 max = sta->my_nonce;
378 }
379 os_memcpy(ptr, min, nonce_len);
380 os_memcpy(ptr + nonce_len, max, nonce_len);
381 ptr += 2 * nonce_len;
382
383 if (sta->my_lid < sta->peer_lid) {
384 min_lid = host_to_le16(sta->my_lid);
385 max_lid = host_to_le16(sta->peer_lid);
386 } else {
387 min_lid = host_to_le16(sta->peer_lid);
388 max_lid = host_to_le16(sta->my_lid);
389 }
390 os_memcpy(ptr, &min_lid, lid_len);
391 os_memcpy(ptr + lid_len, &max_lid, lid_len);
392 ptr += 2 * lid_len;
393
394 /* SAE */
395 RSN_SELECTOR_PUT(ptr, wpa_cipher_to_suite(0, WPA_CIPHER_GCMP));
396 ptr += 4;
397
398 if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
399 min = myaddr;
400 max = peer;
401 } else {
402 min = peer;
403 max = myaddr;
404 }
405 os_memcpy(ptr, min, ETH_ALEN);
406 os_memcpy(ptr + ETH_ALEN, max, ETH_ALEN);
407
408 sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk),
409 "Temporal Key Derivation", context, sizeof(context),
410 sta->mtk, sizeof(sta->mtk));
411 return 0;
412}
413
414
415void mesh_rsn_init_ampe_sta(struct wpa_supplicant *wpa_s, struct sta_info *sta)
416{
417 if (random_get_bytes(sta->my_nonce, 32) < 0) {
418 wpa_printf(MSG_INFO, "mesh: Failed to derive random nonce");
419 /* TODO: How to handle this more cleanly? */
420 }
421 os_memset(sta->peer_nonce, 0, 32);
422 mesh_rsn_derive_aek(wpa_s->mesh_rsn, sta);
423}
424
425
426/* insert AMPE and encrypted MIC at @ie.
427 * @mesh_rsn: mesh RSN context
428 * @sta: STA we're sending to
429 * @cat: pointer to category code in frame header.
430 * @buf: wpabuf to add encrypted AMPE and MIC to.
431 * */
432int mesh_rsn_protect_frame(struct mesh_rsn *rsn, struct sta_info *sta,
433 const u8 *cat, struct wpabuf *buf)
434{
435 struct ieee80211_ampe_ie *ampe;
436 u8 const *ie = wpabuf_head_u8(buf) + wpabuf_len(buf);
437 u8 *ampe_ie = NULL, *mic_ie = NULL, *mic_payload;
438 const u8 *aad[] = { rsn->wpa_s->own_addr, sta->addr, cat };
439 const size_t aad_len[] = { ETH_ALEN, ETH_ALEN, ie - cat };
440 int ret = 0;
441
442 if (AES_BLOCK_SIZE + 2 + sizeof(*ampe) + 2 > wpabuf_tailroom(buf)) {
443 wpa_printf(MSG_ERROR, "protect frame: buffer too small");
444 return -EINVAL;
445 }
446
447 ampe_ie = os_zalloc(2 + sizeof(*ampe));
448 if (!ampe_ie) {
449 wpa_printf(MSG_ERROR, "protect frame: out of memory");
450 return -ENOMEM;
451 }
452
453 mic_ie = os_zalloc(2 + AES_BLOCK_SIZE);
454 if (!mic_ie) {
455 wpa_printf(MSG_ERROR, "protect frame: out of memory");
456 ret = -ENOMEM;
457 goto free;
458 }
459
460 /* IE: AMPE */
461 ampe_ie[0] = WLAN_EID_AMPE;
462 ampe_ie[1] = sizeof(*ampe);
463 ampe = (struct ieee80211_ampe_ie *) (ampe_ie + 2);
464
465 RSN_SELECTOR_PUT(ampe->selected_pairwise_suite,
466 wpa_cipher_to_suite(WPA_PROTO_RSN, WPA_CIPHER_CCMP));
467 os_memcpy(ampe->local_nonce, sta->my_nonce, 32);
468 os_memcpy(ampe->peer_nonce, sta->peer_nonce, 32);
469 /* incomplete: see 13.5.4 */
470 /* TODO: static mgtk for now since we don't support rekeying! */
471 os_memcpy(ampe->mgtk, rsn->mgtk, 16);
472 /* TODO: Populate Key RSC */
473 /* expire in 13 decades or so */
474 os_memset(ampe->key_expiration, 0xff, 4);
475
476 /* IE: MIC */
477 mic_ie[0] = WLAN_EID_MIC;
478 mic_ie[1] = AES_BLOCK_SIZE;
479 wpabuf_put_data(buf, mic_ie, 2);
480 /* MIC field is output ciphertext */
481
482 /* encrypt after MIC */
483 mic_payload = (u8 *) wpabuf_put(buf, 2 + sizeof(*ampe) +
484 AES_BLOCK_SIZE);
485
486 if (aes_siv_encrypt(sta->aek, ampe_ie, 2 + sizeof(*ampe), 3,
487 aad, aad_len, mic_payload)) {
488 wpa_printf(MSG_ERROR, "protect frame: failed to encrypt");
489 ret = -ENOMEM;
490 goto free;
491 }
492
493free:
494 os_free(ampe_ie);
495 os_free(mic_ie);
496
497 return ret;
498}
499
500
501int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta,
502 struct ieee802_11_elems *elems, const u8 *cat,
Dmitry Shmidtd97138d2015-12-28 13:27:49 -0800503 const u8 *chosen_pmk,
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800504 const u8 *start, size_t elems_len)
505{
506 int ret = 0;
507 struct ieee80211_ampe_ie *ampe;
508 u8 null_nonce[32] = {};
509 u8 ampe_eid;
510 u8 ampe_ie_len;
511 u8 *ampe_buf, *crypt = NULL;
512 size_t crypt_len;
513 const u8 *aad[] = { sta->addr, wpa_s->own_addr, cat };
514 const size_t aad_len[] = { ETH_ALEN, ETH_ALEN,
515 (elems->mic - 2) - cat };
516
Dmitry Shmidtd97138d2015-12-28 13:27:49 -0800517 if (chosen_pmk && os_memcmp(chosen_pmk, sta->sae->pmkid, PMKID_LEN)) {
518 wpa_msg(wpa_s, MSG_DEBUG,
519 "Mesh RSN: Invalid PMKID (Chosen PMK did not match calculated PMKID)");
520 return -1;
521 }
522
Dmitry Shmidt6c0da2b2015-01-05 13:08:17 -0800523 if (!elems->mic || elems->mic_len < AES_BLOCK_SIZE) {
524 wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing mic ie");
525 return -1;
526 }
527
528 ampe_buf = (u8 *) elems->mic + elems->mic_len;
529 if ((int) elems_len < ampe_buf - start)
530 return -1;
531
532 crypt_len = elems_len - (elems->mic - start);
533 if (crypt_len < 2) {
534 wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing ampe ie");
535 return -1;
536 }
537
538 /* crypt is modified by siv_decrypt */
539 crypt = os_zalloc(crypt_len);
540 if (!crypt) {
541 wpa_printf(MSG_ERROR, "Mesh RSN: out of memory");
542 ret = -ENOMEM;
543 goto free;
544 }
545
546 os_memcpy(crypt, elems->mic, crypt_len);
547
548 if (aes_siv_decrypt(sta->aek, crypt, crypt_len, 3,
549 aad, aad_len, ampe_buf)) {
550 wpa_printf(MSG_ERROR, "Mesh RSN: frame verification failed!");
551 ret = -1;
552 goto free;
553 }
554
555 ampe_eid = *ampe_buf++;
556 ampe_ie_len = *ampe_buf++;
557
558 if (ampe_eid != WLAN_EID_AMPE ||
559 ampe_ie_len < sizeof(struct ieee80211_ampe_ie)) {
560 wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: invalid ampe ie");
561 ret = -1;
562 goto free;
563 }
564
565 ampe = (struct ieee80211_ampe_ie *) ampe_buf;
566 if (os_memcmp(ampe->peer_nonce, null_nonce, 32) != 0 &&
567 os_memcmp(ampe->peer_nonce, sta->my_nonce, 32) != 0) {
568 wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: invalid peer nonce");
569 ret = -1;
570 goto free;
571 }
572 os_memcpy(sta->peer_nonce, ampe->local_nonce,
573 sizeof(ampe->local_nonce));
574 os_memcpy(sta->mgtk, ampe->mgtk, sizeof(ampe->mgtk));
575
576 /* todo parse mgtk expiration */
577free:
578 os_free(crypt);
579 return ret;
580}