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