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FT: Add selection of FT+FILS AKMs
[thirdparty/hostap.git] / src / ap / wpa_auth_ft.c
1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
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 "utils/list.h"
14 #include "common/ieee802_11_defs.h"
15 #include "common/ieee802_11_common.h"
16 #include "crypto/aes_wrap.h"
17 #include "crypto/random.h"
18 #include "ap_config.h"
19 #include "ieee802_11.h"
20 #include "wmm.h"
21 #include "wpa_auth.h"
22 #include "wpa_auth_i.h"
23
24
25 #ifdef CONFIG_IEEE80211R_AP
26
27 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
28 const u8 *current_ap, const u8 *sta_addr,
29 u16 status, const u8 *resp_ies,
30 size_t resp_ies_len);
31
32
33 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
34 const u8 *data, size_t data_len)
35 {
36 if (wpa_auth->cb->send_ether == NULL)
37 return -1;
38 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
39 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
40 data, data_len);
41 }
42
43
44 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
45 const u8 *dst, const u8 *data, size_t data_len)
46 {
47 if (wpa_auth->cb->send_ft_action == NULL)
48 return -1;
49 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
50 data, data_len);
51 }
52
53
54 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
55 const u8 *addr, const u8 *p2p_dev_addr,
56 const u8 *prev_psk)
57 {
58 if (wpa_auth->cb->get_psk == NULL)
59 return NULL;
60 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
61 prev_psk);
62 }
63
64
65 static struct wpa_state_machine *
66 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
67 {
68 if (wpa_auth->cb->add_sta == NULL)
69 return NULL;
70 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
71 }
72
73
74 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
75 const u8 *sta_addr,
76 u8 *tspec_ie, size_t tspec_ielen)
77 {
78 if (wpa_auth->cb->add_tspec == NULL) {
79 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
80 return -1;
81 }
82 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
83 tspec_ielen);
84 }
85
86
87 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
88 {
89 u8 *pos = buf;
90 u8 capab;
91 if (len < 2 + sizeof(struct rsn_mdie))
92 return -1;
93
94 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
95 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
96 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
97 pos += MOBILITY_DOMAIN_ID_LEN;
98 capab = 0;
99 if (conf->ft_over_ds)
100 capab |= RSN_FT_CAPAB_FT_OVER_DS;
101 *pos++ = capab;
102
103 return pos - buf;
104 }
105
106
107 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
108 size_t r0kh_id_len,
109 const u8 *anonce, const u8 *snonce,
110 u8 *buf, size_t len, const u8 *subelem,
111 size_t subelem_len)
112 {
113 u8 *pos = buf, *ielen;
114 struct rsn_ftie *hdr;
115
116 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
117 subelem_len)
118 return -1;
119
120 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
121 ielen = pos++;
122
123 hdr = (struct rsn_ftie *) pos;
124 os_memset(hdr, 0, sizeof(*hdr));
125 pos += sizeof(*hdr);
126 WPA_PUT_LE16(hdr->mic_control, 0);
127 if (anonce)
128 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
129 if (snonce)
130 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
131
132 /* Optional Parameters */
133 *pos++ = FTIE_SUBELEM_R1KH_ID;
134 *pos++ = FT_R1KH_ID_LEN;
135 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
136 pos += FT_R1KH_ID_LEN;
137
138 if (r0kh_id) {
139 *pos++ = FTIE_SUBELEM_R0KH_ID;
140 *pos++ = r0kh_id_len;
141 os_memcpy(pos, r0kh_id, r0kh_id_len);
142 pos += r0kh_id_len;
143 }
144
145 if (subelem) {
146 os_memcpy(pos, subelem, subelem_len);
147 pos += subelem_len;
148 }
149
150 *ielen = pos - buf - 2;
151
152 return pos - buf;
153 }
154
155
156 struct wpa_ft_pmk_r0_sa {
157 struct wpa_ft_pmk_r0_sa *next;
158 u8 pmk_r0[PMK_LEN];
159 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
160 u8 spa[ETH_ALEN];
161 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
162 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
163 int pmk_r1_pushed;
164 };
165
166 struct wpa_ft_pmk_r1_sa {
167 struct wpa_ft_pmk_r1_sa *next;
168 u8 pmk_r1[PMK_LEN];
169 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
170 u8 spa[ETH_ALEN];
171 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
172 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
173 };
174
175 struct wpa_ft_pmk_cache {
176 struct wpa_ft_pmk_r0_sa *pmk_r0;
177 struct wpa_ft_pmk_r1_sa *pmk_r1;
178 };
179
180 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
181 {
182 struct wpa_ft_pmk_cache *cache;
183
184 cache = os_zalloc(sizeof(*cache));
185
186 return cache;
187 }
188
189
190 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
191 {
192 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
193 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
194
195 r0 = cache->pmk_r0;
196 while (r0) {
197 r0prev = r0;
198 r0 = r0->next;
199 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
200 os_free(r0prev);
201 }
202
203 r1 = cache->pmk_r1;
204 while (r1) {
205 r1prev = r1;
206 r1 = r1->next;
207 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
208 os_free(r1prev);
209 }
210
211 os_free(cache);
212 }
213
214
215 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
216 const u8 *spa, const u8 *pmk_r0,
217 const u8 *pmk_r0_name, int pairwise)
218 {
219 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
220 struct wpa_ft_pmk_r0_sa *r0;
221
222 /* TODO: add expiration and limit on number of entries in cache */
223
224 r0 = os_zalloc(sizeof(*r0));
225 if (r0 == NULL)
226 return -1;
227
228 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
229 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
230 os_memcpy(r0->spa, spa, ETH_ALEN);
231 r0->pairwise = pairwise;
232
233 r0->next = cache->pmk_r0;
234 cache->pmk_r0 = r0;
235
236 return 0;
237 }
238
239
240 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
241 const u8 *spa, const u8 *pmk_r0_name,
242 u8 *pmk_r0, int *pairwise)
243 {
244 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
245 struct wpa_ft_pmk_r0_sa *r0;
246
247 r0 = cache->pmk_r0;
248 while (r0) {
249 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
250 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
251 WPA_PMK_NAME_LEN) == 0) {
252 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
253 if (pairwise)
254 *pairwise = r0->pairwise;
255 return 0;
256 }
257
258 r0 = r0->next;
259 }
260
261 return -1;
262 }
263
264
265 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
266 const u8 *spa, const u8 *pmk_r1,
267 const u8 *pmk_r1_name, int pairwise)
268 {
269 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
270 struct wpa_ft_pmk_r1_sa *r1;
271
272 /* TODO: add expiration and limit on number of entries in cache */
273
274 r1 = os_zalloc(sizeof(*r1));
275 if (r1 == NULL)
276 return -1;
277
278 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
279 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
280 os_memcpy(r1->spa, spa, ETH_ALEN);
281 r1->pairwise = pairwise;
282
283 r1->next = cache->pmk_r1;
284 cache->pmk_r1 = r1;
285
286 return 0;
287 }
288
289
290 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
291 const u8 *spa, const u8 *pmk_r1_name,
292 u8 *pmk_r1, int *pairwise)
293 {
294 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
295 struct wpa_ft_pmk_r1_sa *r1;
296
297 r1 = cache->pmk_r1;
298 while (r1) {
299 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
300 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
301 WPA_PMK_NAME_LEN) == 0) {
302 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
303 if (pairwise)
304 *pairwise = r1->pairwise;
305 return 0;
306 }
307
308 r1 = r1->next;
309 }
310
311 return -1;
312 }
313
314
315 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
316 const u8 *ies, size_t ies_len,
317 const u8 *pmk_r0_name)
318 {
319 struct ft_remote_r0kh *r0kh;
320 struct ft_r0kh_r1kh_pull_frame frame, f;
321
322 r0kh = sm->wpa_auth->conf.r0kh_list;
323 while (r0kh) {
324 if (r0kh->id_len == sm->r0kh_id_len &&
325 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) ==
326 0)
327 break;
328 r0kh = r0kh->next;
329 }
330 if (r0kh == NULL) {
331 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
332 sm->r0kh_id, sm->r0kh_id_len);
333 return -1;
334 }
335
336 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
337 "address " MACSTR, MAC2STR(r0kh->addr));
338
339 os_memset(&frame, 0, sizeof(frame));
340 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
341 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
342 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
343 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN);
344
345 /* aes_wrap() does not support inplace encryption, so use a temporary
346 * buffer for the data. */
347 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) {
348 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
349 "nonce");
350 return -1;
351 }
352 os_memcpy(sm->ft_pending_pull_nonce, f.nonce,
353 FT_R0KH_R1KH_PULL_NONCE_LEN);
354 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
355 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
356 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN);
357 os_memset(f.pad, 0, sizeof(f.pad));
358
359 if (aes_wrap(r0kh->key, sizeof(r0kh->key),
360 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
361 f.nonce, frame.nonce) < 0)
362 return -1;
363
364 wpabuf_free(sm->ft_pending_req_ies);
365 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
366 if (sm->ft_pending_req_ies == NULL)
367 return -1;
368
369 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
370
371 return 0;
372 }
373
374
375 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
376 struct wpa_ptk *ptk)
377 {
378 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
379 u8 pmk_r1[PMK_LEN];
380 u8 ptk_name[WPA_PMK_NAME_LEN];
381 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
382 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
383 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
384 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
385 const u8 *ssid = sm->wpa_auth->conf.ssid;
386 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
387 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
388
389 if (sm->xxkey_len == 0) {
390 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
391 "derivation");
392 return -1;
393 }
394
395 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
396 r0kh, r0kh_len, sm->addr,
397 pmk_r0, pmk_r0_name) < 0)
398 return -1;
399 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
400 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
401 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
402 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
403 sm->pairwise);
404
405 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
406 pmk_r1, sm->pmk_r1_name) < 0)
407 return -1;
408 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
409 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
410 WPA_PMK_NAME_LEN);
411 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
412 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1,
413 sm->pmk_r1_name, sm->pairwise);
414
415 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
416 sm->wpa_auth->addr, sm->pmk_r1_name,
417 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
418 }
419
420
421 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
422 const u8 *addr, int idx, u8 *seq)
423 {
424 if (wpa_auth->cb->get_seqnum == NULL)
425 return -1;
426 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
427 }
428
429
430 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
431 {
432 u8 *subelem;
433 struct wpa_group *gsm = sm->group;
434 size_t subelem_len, pad_len;
435 const u8 *key;
436 size_t key_len;
437 u8 keybuf[32];
438
439 key_len = gsm->GTK_len;
440 if (key_len > sizeof(keybuf))
441 return NULL;
442
443 /*
444 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
445 * than 16 bytes.
446 */
447 pad_len = key_len % 8;
448 if (pad_len)
449 pad_len = 8 - pad_len;
450 if (key_len + pad_len < 16)
451 pad_len += 8;
452 if (pad_len && key_len < sizeof(keybuf)) {
453 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
454 os_memset(keybuf + key_len, 0, pad_len);
455 keybuf[key_len] = 0xdd;
456 key_len += pad_len;
457 key = keybuf;
458 } else
459 key = gsm->GTK[gsm->GN - 1];
460
461 /*
462 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
463 * Key[5..32].
464 */
465 subelem_len = 13 + key_len + 8;
466 subelem = os_zalloc(subelem_len);
467 if (subelem == NULL)
468 return NULL;
469
470 subelem[0] = FTIE_SUBELEM_GTK;
471 subelem[1] = 11 + key_len + 8;
472 /* Key ID in B0-B1 of Key Info */
473 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
474 subelem[4] = gsm->GTK_len;
475 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
476 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key,
477 subelem + 13)) {
478 os_free(subelem);
479 return NULL;
480 }
481
482 *len = subelem_len;
483 return subelem;
484 }
485
486
487 #ifdef CONFIG_IEEE80211W
488 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
489 {
490 u8 *subelem, *pos;
491 struct wpa_group *gsm = sm->group;
492 size_t subelem_len;
493
494 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
495 * Key[16+8] */
496 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
497 subelem = os_zalloc(subelem_len);
498 if (subelem == NULL)
499 return NULL;
500
501 pos = subelem;
502 *pos++ = FTIE_SUBELEM_IGTK;
503 *pos++ = subelem_len - 2;
504 WPA_PUT_LE16(pos, gsm->GN_igtk);
505 pos += 2;
506 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
507 pos += 6;
508 *pos++ = WPA_IGTK_LEN;
509 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8,
510 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
511 os_free(subelem);
512 return NULL;
513 }
514
515 *len = subelem_len;
516 return subelem;
517 }
518 #endif /* CONFIG_IEEE80211W */
519
520
521 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
522 u8 *pos, u8 *end, u8 id, u8 descr_count,
523 const u8 *ies, size_t ies_len)
524 {
525 struct ieee802_11_elems parse;
526 struct rsn_rdie *rdie;
527
528 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
529 id, descr_count);
530 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
531 ies, ies_len);
532
533 if (end - pos < (int) sizeof(*rdie)) {
534 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
535 return pos;
536 }
537
538 *pos++ = WLAN_EID_RIC_DATA;
539 *pos++ = sizeof(*rdie);
540 rdie = (struct rsn_rdie *) pos;
541 rdie->id = id;
542 rdie->descr_count = 0;
543 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
544 pos += sizeof(*rdie);
545
546 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
547 ParseFailed) {
548 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
549 rdie->status_code =
550 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
551 return pos;
552 }
553
554 if (parse.wmm_tspec) {
555 struct wmm_tspec_element *tspec;
556
557 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
558 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
559 "(%d)", (int) parse.wmm_tspec_len);
560 rdie->status_code =
561 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
562 return pos;
563 }
564 if (end - pos < (int) sizeof(*tspec)) {
565 wpa_printf(MSG_ERROR, "FT: Not enough room for "
566 "response TSPEC");
567 rdie->status_code =
568 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
569 return pos;
570 }
571 tspec = (struct wmm_tspec_element *) pos;
572 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
573 }
574
575 #ifdef NEED_AP_MLME
576 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
577 int res;
578
579 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
580 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
581 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
582 rdie->status_code =
583 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
584 else if (res == WMM_ADDTS_STATUS_REFUSED)
585 rdie->status_code =
586 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
587 else {
588 /* TSPEC accepted; include updated TSPEC in response */
589 rdie->descr_count = 1;
590 pos += sizeof(struct wmm_tspec_element);
591 }
592 return pos;
593 }
594 #endif /* NEED_AP_MLME */
595
596 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
597 int res;
598
599 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
600 sizeof(struct wmm_tspec_element));
601 if (res >= 0) {
602 if (res)
603 rdie->status_code = host_to_le16(res);
604 else {
605 /* TSPEC accepted; include updated TSPEC in
606 * response */
607 rdie->descr_count = 1;
608 pos += sizeof(struct wmm_tspec_element);
609 }
610 return pos;
611 }
612 }
613
614 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
615 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
616 return pos;
617 }
618
619
620 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
621 const u8 *ric, size_t ric_len)
622 {
623 const u8 *rpos, *start;
624 const struct rsn_rdie *rdie;
625
626 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
627
628 rpos = ric;
629 while (rpos + sizeof(*rdie) < ric + ric_len) {
630 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
631 rpos + 2 + rpos[1] > ric + ric_len)
632 break;
633 rdie = (const struct rsn_rdie *) (rpos + 2);
634 rpos += 2 + rpos[1];
635 start = rpos;
636
637 while (rpos + 2 <= ric + ric_len &&
638 rpos + 2 + rpos[1] <= ric + ric_len) {
639 if (rpos[0] == WLAN_EID_RIC_DATA)
640 break;
641 rpos += 2 + rpos[1];
642 }
643 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
644 rdie->descr_count,
645 start, rpos - start);
646 }
647
648 return pos;
649 }
650
651
652 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
653 size_t max_len, int auth_alg,
654 const u8 *req_ies, size_t req_ies_len)
655 {
656 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
657 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
658 int res;
659 struct wpa_auth_config *conf;
660 struct rsn_ftie *_ftie;
661 struct wpa_ft_ies parse;
662 u8 *ric_start;
663 u8 *anonce, *snonce;
664
665 if (sm == NULL)
666 return pos;
667
668 conf = &sm->wpa_auth->conf;
669
670 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
671 return pos;
672
673 end = pos + max_len;
674
675 if (auth_alg == WLAN_AUTH_FT) {
676 /*
677 * RSN (only present if this is a Reassociation Response and
678 * part of a fast BSS transition)
679 */
680 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
681 if (res < 0)
682 return pos;
683 rsnie = pos;
684 rsnie_len = res;
685 pos += res;
686 }
687
688 /* Mobility Domain Information */
689 res = wpa_write_mdie(conf, pos, end - pos);
690 if (res < 0)
691 return pos;
692 mdie = pos;
693 mdie_len = res;
694 pos += res;
695
696 /* Fast BSS Transition Information */
697 if (auth_alg == WLAN_AUTH_FT) {
698 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
699 r0kh_id = sm->r0kh_id;
700 r0kh_id_len = sm->r0kh_id_len;
701 anonce = sm->ANonce;
702 snonce = sm->SNonce;
703 #ifdef CONFIG_IEEE80211W
704 if (sm->mgmt_frame_prot) {
705 u8 *igtk;
706 size_t igtk_len;
707 u8 *nbuf;
708 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
709 if (igtk == NULL) {
710 os_free(subelem);
711 return pos;
712 }
713 nbuf = os_realloc(subelem, subelem_len + igtk_len);
714 if (nbuf == NULL) {
715 os_free(subelem);
716 os_free(igtk);
717 return pos;
718 }
719 subelem = nbuf;
720 os_memcpy(subelem + subelem_len, igtk, igtk_len);
721 subelem_len += igtk_len;
722 os_free(igtk);
723 }
724 #endif /* CONFIG_IEEE80211W */
725 } else {
726 r0kh_id = conf->r0_key_holder;
727 r0kh_id_len = conf->r0_key_holder_len;
728 anonce = NULL;
729 snonce = NULL;
730 }
731 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
732 end - pos, subelem, subelem_len);
733 os_free(subelem);
734 if (res < 0)
735 return pos;
736 ftie = pos;
737 ftie_len = res;
738 pos += res;
739
740 _ftie = (struct rsn_ftie *) (ftie + 2);
741 if (auth_alg == WLAN_AUTH_FT)
742 _ftie->mic_control[1] = 3; /* Information element count */
743
744 ric_start = pos;
745 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
746 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
747 parse.ric_len);
748 if (auth_alg == WLAN_AUTH_FT)
749 _ftie->mic_control[1] +=
750 ieee802_11_ie_count(ric_start,
751 pos - ric_start);
752 }
753 if (ric_start == pos)
754 ric_start = NULL;
755
756 if (auth_alg == WLAN_AUTH_FT &&
757 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
758 sm->wpa_auth->addr, 6,
759 mdie, mdie_len, ftie, ftie_len,
760 rsnie, rsnie_len,
761 ric_start, ric_start ? pos - ric_start : 0,
762 _ftie->mic) < 0)
763 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
764
765 os_free(sm->assoc_resp_ftie);
766 sm->assoc_resp_ftie = os_malloc(ftie_len);
767 if (sm->assoc_resp_ftie)
768 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
769
770 return pos;
771 }
772
773
774 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
775 int vlan_id,
776 enum wpa_alg alg, const u8 *addr, int idx,
777 u8 *key, size_t key_len)
778 {
779 if (wpa_auth->cb->set_key == NULL)
780 return -1;
781 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
782 key, key_len);
783 }
784
785
786 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
787 {
788 enum wpa_alg alg;
789 int klen;
790
791 /* MLME-SETKEYS.request(PTK) */
792 alg = wpa_cipher_to_alg(sm->pairwise);
793 klen = wpa_cipher_key_len(sm->pairwise);
794 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
795 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
796 "PTK configuration", sm->pairwise);
797 return;
798 }
799
800 /* FIX: add STA entry to kernel/driver here? The set_key will fail
801 * most likely without this.. At the moment, STA entry is added only
802 * after association has been completed. This function will be called
803 * again after association to get the PTK configured, but that could be
804 * optimized by adding the STA entry earlier.
805 */
806 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
807 sm->PTK.tk, klen))
808 return;
809
810 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
811 sm->pairwise_set = TRUE;
812 }
813
814
815 /* Derive PMK-R1 from PSK, check all available PSK */
816 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
817 const u8 *req_pmk_r1_name,
818 u8 *out_pmk_r1, int *out_pairwise)
819 {
820 const u8 *pmk = NULL;
821 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
822 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
823 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
824 const u8 *mdid = wpa_auth->conf.mobility_domain;
825 const u8 *r0kh = sm->r0kh_id;
826 size_t r0kh_len = sm->r0kh_id_len;
827 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
828 const u8 *ssid = wpa_auth->conf.ssid;
829 size_t ssid_len = wpa_auth->conf.ssid_len;
830 int pairwise;
831
832 pairwise = sm->pairwise;
833
834 for (;;) {
835 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
836 pmk);
837 if (pmk == NULL)
838 break;
839
840 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
841 r0kh_len, sm->addr,
842 pmk_r0, pmk_r0_name) < 0 ||
843 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
844 pmk_r1, pmk_r1_name) < 0 ||
845 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
846 WPA_PMK_NAME_LEN) != 0)
847 continue;
848
849 /* We found a PSK that matches the requested pmk_r1_name */
850 wpa_printf(MSG_DEBUG,
851 "FT: Found PSK to generate PMK-R1 locally");
852 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
853 if (out_pairwise)
854 *out_pairwise = pairwise;
855 return 0;
856 }
857
858 wpa_printf(MSG_DEBUG,
859 "FT: Did not find PSK to generate PMK-R1 locally");
860 return -1;
861 }
862
863
864 /* Detect the configuration the station asked for.
865 * Required to detect FT-PSK and pairwise cipher.
866 */
867 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
868 struct wpa_ft_ies *parse)
869 {
870 int key_mgmt, ciphers;
871
872 if (sm->wpa_key_mgmt)
873 return 0;
874
875 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
876 if (!key_mgmt) {
877 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
878 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
879 return -1;
880 }
881 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
882 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
883 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
884 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
885 #ifdef CONFIG_FILS
886 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
887 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
888 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
889 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
890 #endif /* CONFIG_FILS */
891 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
892 if (!ciphers) {
893 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
894 MACSTR,
895 parse->pairwise_cipher, MAC2STR(sm->addr));
896 return -1;
897 }
898 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
899
900 return 0;
901 }
902
903
904 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
905 const u8 *ies, size_t ies_len,
906 u8 **resp_ies, size_t *resp_ies_len)
907 {
908 struct rsn_mdie *mdie;
909 struct rsn_ftie *ftie;
910 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
911 u8 ptk_name[WPA_PMK_NAME_LEN];
912 struct wpa_auth_config *conf;
913 struct wpa_ft_ies parse;
914 size_t buflen;
915 int ret;
916 u8 *pos, *end;
917 int pairwise;
918
919 *resp_ies = NULL;
920 *resp_ies_len = 0;
921
922 sm->pmk_r1_name_valid = 0;
923 conf = &sm->wpa_auth->conf;
924
925 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
926 ies, ies_len);
927
928 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
929 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
930 return WLAN_STATUS_UNSPECIFIED_FAILURE;
931 }
932
933 mdie = (struct rsn_mdie *) parse.mdie;
934 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
935 os_memcmp(mdie->mobility_domain,
936 sm->wpa_auth->conf.mobility_domain,
937 MOBILITY_DOMAIN_ID_LEN) != 0) {
938 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
939 return WLAN_STATUS_INVALID_MDIE;
940 }
941
942 ftie = (struct rsn_ftie *) parse.ftie;
943 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
944 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
945 return WLAN_STATUS_INVALID_FTIE;
946 }
947
948 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
949
950 if (parse.r0kh_id == NULL) {
951 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
952 return WLAN_STATUS_INVALID_FTIE;
953 }
954
955 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
956 parse.r0kh_id, parse.r0kh_id_len);
957 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
958 sm->r0kh_id_len = parse.r0kh_id_len;
959
960 if (parse.rsn_pmkid == NULL) {
961 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
962 return WLAN_STATUS_INVALID_PMKID;
963 }
964
965 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
966 return WLAN_STATUS_UNSPECIFIED_FAILURE;
967
968 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
969 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
970 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
971 sm->wpa_auth->conf.r1_key_holder, sm->addr,
972 pmk_r1_name) < 0)
973 return WLAN_STATUS_UNSPECIFIED_FAILURE;
974 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
975 pmk_r1_name, WPA_PMK_NAME_LEN);
976
977 if (conf->ft_psk_generate_local &&
978 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
979 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0)
980 return WLAN_STATUS_INVALID_PMKID;
981 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
982 pmk_r1, &pairwise) < 0) {
983 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
984 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
985 "PMK-R1 and unknown R0KH-ID");
986 return WLAN_STATUS_INVALID_PMKID;
987 }
988
989 return -1; /* Status pending */
990 }
991
992 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
993 sm->pmk_r1_name_valid = 1;
994 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
995
996 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
997 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
998 "ANonce");
999 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1000 }
1001
1002 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1003 sm->SNonce, WPA_NONCE_LEN);
1004 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
1005 sm->ANonce, WPA_NONCE_LEN);
1006
1007 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1008 sm->wpa_auth->addr, pmk_r1_name,
1009 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
1010 pairwise) < 0)
1011 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1012
1013 sm->pairwise = pairwise;
1014 sm->PTK_valid = TRUE;
1015 wpa_ft_install_ptk(sm);
1016
1017 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
1018 2 + FT_R1KH_ID_LEN + 200;
1019 *resp_ies = os_zalloc(buflen);
1020 if (*resp_ies == NULL)
1021 goto fail;
1022
1023 pos = *resp_ies;
1024 end = *resp_ies + buflen;
1025
1026 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
1027 if (ret < 0)
1028 goto fail;
1029 pos += ret;
1030
1031 ret = wpa_write_mdie(conf, pos, end - pos);
1032 if (ret < 0)
1033 goto fail;
1034 pos += ret;
1035
1036 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
1037 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
1038 if (ret < 0)
1039 goto fail;
1040 pos += ret;
1041
1042 *resp_ies_len = pos - *resp_ies;
1043
1044 return WLAN_STATUS_SUCCESS;
1045 fail:
1046 os_free(*resp_ies);
1047 *resp_ies = NULL;
1048 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1049 }
1050
1051
1052 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
1053 u16 auth_transaction, const u8 *ies, size_t ies_len,
1054 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
1055 u16 auth_transaction, u16 status,
1056 const u8 *ies, size_t ies_len),
1057 void *ctx)
1058 {
1059 u16 status;
1060 u8 *resp_ies;
1061 size_t resp_ies_len;
1062 int res;
1063
1064 if (sm == NULL) {
1065 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
1066 "WPA SM not available");
1067 return;
1068 }
1069
1070 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
1071 " BSSID=" MACSTR " transaction=%d",
1072 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
1073 sm->ft_pending_cb = cb;
1074 sm->ft_pending_cb_ctx = ctx;
1075 sm->ft_pending_auth_transaction = auth_transaction;
1076 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
1077 &resp_ies_len);
1078 if (res < 0) {
1079 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
1080 return;
1081 }
1082 status = res;
1083
1084 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
1085 " auth_transaction=%d status=%d",
1086 MAC2STR(sm->addr), auth_transaction + 1, status);
1087 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1088 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
1089 resp_ies, resp_ies_len);
1090 os_free(resp_ies);
1091 }
1092
1093
1094 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
1095 size_t ies_len)
1096 {
1097 struct wpa_ft_ies parse;
1098 struct rsn_mdie *mdie;
1099 struct rsn_ftie *ftie;
1100 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1101 size_t mic_len = 16;
1102 unsigned int count;
1103
1104 if (sm == NULL)
1105 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1106
1107 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1108
1109 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1110 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1111 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1112 }
1113
1114 if (parse.rsn == NULL) {
1115 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1116 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1117 }
1118
1119 if (parse.rsn_pmkid == NULL) {
1120 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1121 return WLAN_STATUS_INVALID_PMKID;
1122 }
1123
1124 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1125 != 0) {
1126 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1127 "with the PMKR1Name derived from auth request");
1128 return WLAN_STATUS_INVALID_PMKID;
1129 }
1130
1131 mdie = (struct rsn_mdie *) parse.mdie;
1132 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1133 os_memcmp(mdie->mobility_domain,
1134 sm->wpa_auth->conf.mobility_domain,
1135 MOBILITY_DOMAIN_ID_LEN) != 0) {
1136 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1137 return WLAN_STATUS_INVALID_MDIE;
1138 }
1139
1140 ftie = (struct rsn_ftie *) parse.ftie;
1141 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1142 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1143 return WLAN_STATUS_INVALID_FTIE;
1144 }
1145
1146 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1147 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1148 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1149 ftie->snonce, WPA_NONCE_LEN);
1150 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1151 sm->SNonce, WPA_NONCE_LEN);
1152 return WLAN_STATUS_INVALID_FTIE;
1153 }
1154
1155 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1156 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1157 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1158 ftie->anonce, WPA_NONCE_LEN);
1159 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1160 sm->ANonce, WPA_NONCE_LEN);
1161 return WLAN_STATUS_INVALID_FTIE;
1162 }
1163
1164
1165 if (parse.r0kh_id == NULL) {
1166 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1167 return WLAN_STATUS_INVALID_FTIE;
1168 }
1169
1170 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1171 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1172 {
1173 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1174 "the current R0KH-ID");
1175 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1176 parse.r0kh_id, parse.r0kh_id_len);
1177 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1178 sm->r0kh_id, sm->r0kh_id_len);
1179 return WLAN_STATUS_INVALID_FTIE;
1180 }
1181
1182 if (parse.r1kh_id == NULL) {
1183 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1184 return WLAN_STATUS_INVALID_FTIE;
1185 }
1186
1187 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1188 FT_R1KH_ID_LEN) != 0) {
1189 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1190 "ReassocReq");
1191 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1192 parse.r1kh_id, FT_R1KH_ID_LEN);
1193 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1194 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1195 return WLAN_STATUS_INVALID_FTIE;
1196 }
1197
1198 if (parse.rsn_pmkid == NULL ||
1199 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1200 {
1201 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1202 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1203 return WLAN_STATUS_INVALID_PMKID;
1204 }
1205
1206 count = 3;
1207 if (parse.ric)
1208 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1209 if (ftie->mic_control[1] != count) {
1210 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1211 "Control: received %u expected %u",
1212 ftie->mic_control[1], count);
1213 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1214 }
1215
1216 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1217 sm->wpa_auth->addr, 5,
1218 parse.mdie - 2, parse.mdie_len + 2,
1219 parse.ftie - 2, parse.ftie_len + 2,
1220 parse.rsn - 2, parse.rsn_len + 2,
1221 parse.ric, parse.ric_len,
1222 mic) < 0) {
1223 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1224 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1225 }
1226
1227 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
1228 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1229 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1230 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1231 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1232 ftie->mic, mic_len);
1233 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1234 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1235 parse.mdie - 2, parse.mdie_len + 2);
1236 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1237 parse.ftie - 2, parse.ftie_len + 2);
1238 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1239 parse.rsn - 2, parse.rsn_len + 2);
1240 return WLAN_STATUS_INVALID_FTIE;
1241 }
1242
1243 return WLAN_STATUS_SUCCESS;
1244 }
1245
1246
1247 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1248 {
1249 const u8 *sta_addr, *target_ap;
1250 const u8 *ies;
1251 size_t ies_len;
1252 u8 action;
1253 struct ft_rrb_frame *frame;
1254
1255 if (sm == NULL)
1256 return -1;
1257
1258 /*
1259 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1260 * FT Request action frame body[variable]
1261 */
1262
1263 if (len < 14) {
1264 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1265 "(len=%lu)", (unsigned long) len);
1266 return -1;
1267 }
1268
1269 action = data[1];
1270 sta_addr = data + 2;
1271 target_ap = data + 8;
1272 ies = data + 14;
1273 ies_len = len - 14;
1274
1275 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1276 " Target AP=" MACSTR " Action=%d)",
1277 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1278
1279 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1280 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1281 "STA=" MACSTR " STA-Address=" MACSTR,
1282 MAC2STR(sm->addr), MAC2STR(sta_addr));
1283 return -1;
1284 }
1285
1286 /*
1287 * Do some sanity checking on the target AP address (not own and not
1288 * broadcast. This could be extended to filter based on a list of known
1289 * APs in the MD (if such a list were configured).
1290 */
1291 if ((target_ap[0] & 0x01) ||
1292 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1293 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1294 "frame");
1295 return -1;
1296 }
1297
1298 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1299
1300 if (!sm->wpa_auth->conf.ft_over_ds) {
1301 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
1302 return -1;
1303 }
1304
1305 /* RRB - Forward action frame to the target AP */
1306 frame = os_malloc(sizeof(*frame) + len);
1307 if (frame == NULL)
1308 return -1;
1309 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1310 frame->packet_type = FT_PACKET_REQUEST;
1311 frame->action_length = host_to_le16(len);
1312 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1313 os_memcpy(frame + 1, data, len);
1314
1315 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1316 sizeof(*frame) + len);
1317 os_free(frame);
1318
1319 return 0;
1320 }
1321
1322
1323 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1324 u16 auth_transaction, u16 resp,
1325 const u8 *ies, size_t ies_len)
1326 {
1327 struct wpa_state_machine *sm = ctx;
1328 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1329 MAC2STR(sm->addr));
1330 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1331 WLAN_STATUS_SUCCESS, ies, ies_len);
1332 }
1333
1334
1335 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1336 const u8 *current_ap, const u8 *sta_addr,
1337 const u8 *body, size_t len)
1338 {
1339 struct wpa_state_machine *sm;
1340 u16 status;
1341 u8 *resp_ies;
1342 size_t resp_ies_len;
1343 int res;
1344
1345 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1346 if (sm == NULL) {
1347 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1348 "RRB Request");
1349 return -1;
1350 }
1351
1352 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1353
1354 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1355 sm->ft_pending_cb_ctx = sm;
1356 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1357 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1358 &resp_ies_len);
1359 if (res < 0) {
1360 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1361 return 0;
1362 }
1363 status = res;
1364
1365 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1366 resp_ies, resp_ies_len);
1367 os_free(resp_ies);
1368 return res;
1369 }
1370
1371
1372 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1373 const u8 *current_ap, const u8 *sta_addr,
1374 u16 status, const u8 *resp_ies,
1375 size_t resp_ies_len)
1376 {
1377 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1378 size_t rlen;
1379 struct ft_rrb_frame *frame;
1380 u8 *pos;
1381
1382 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1383 " CurrentAP=" MACSTR " status=%d",
1384 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1385 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1386
1387 /* RRB - Forward action frame response to the Current AP */
1388
1389 /*
1390 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1391 * Status_Code[2] FT Request action frame body[variable]
1392 */
1393 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1394
1395 frame = os_malloc(sizeof(*frame) + rlen);
1396 if (frame == NULL)
1397 return -1;
1398 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1399 frame->packet_type = FT_PACKET_RESPONSE;
1400 frame->action_length = host_to_le16(rlen);
1401 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1402 pos = (u8 *) (frame + 1);
1403 *pos++ = WLAN_ACTION_FT;
1404 *pos++ = 2; /* Action: Response */
1405 os_memcpy(pos, sta_addr, ETH_ALEN);
1406 pos += ETH_ALEN;
1407 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1408 pos += ETH_ALEN;
1409 WPA_PUT_LE16(pos, status);
1410 pos += 2;
1411 if (resp_ies)
1412 os_memcpy(pos, resp_ies, resp_ies_len);
1413
1414 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1415 sizeof(*frame) + rlen);
1416 os_free(frame);
1417
1418 return 0;
1419 }
1420
1421
1422 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1423 const u8 *src_addr,
1424 const u8 *data, size_t data_len)
1425 {
1426 struct ft_r0kh_r1kh_pull_frame f;
1427 const u8 *crypt;
1428 u8 *plain;
1429 struct ft_remote_r1kh *r1kh;
1430 struct ft_r0kh_r1kh_resp_frame resp, r;
1431 u8 pmk_r0[PMK_LEN];
1432 int pairwise;
1433
1434 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1435
1436 if (data_len < sizeof(f))
1437 return -1;
1438
1439 r1kh = wpa_auth->conf.r1kh_list;
1440 while (r1kh) {
1441 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1442 break;
1443 r1kh = r1kh->next;
1444 }
1445 if (r1kh == NULL) {
1446 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1447 "PMK-R1 pull source address " MACSTR,
1448 MAC2STR(src_addr));
1449 return -1;
1450 }
1451
1452 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1453 os_memset(&f, 0, sizeof(f));
1454 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1455 /* aes_unwrap() does not support inplace decryption, so use a temporary
1456 * buffer for the data. */
1457 if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1458 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1459 crypt, plain) < 0) {
1460 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1461 "request from " MACSTR, MAC2STR(src_addr));
1462 return -1;
1463 }
1464
1465 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1466 f.nonce, sizeof(f.nonce));
1467 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1468 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1469 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1470 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1471
1472 os_memset(&resp, 0, sizeof(resp));
1473 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1474 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1475 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1476 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1477
1478 /* aes_wrap() does not support inplace encryption, so use a temporary
1479 * buffer for the data. */
1480 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1481 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1482 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1483 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1484 &pairwise) < 0) {
1485 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1486 "PMK-R1 pull");
1487 return -1;
1488 }
1489
1490 if (wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1491 r.pmk_r1, r.pmk_r1_name) < 0) {
1492 os_memset(pmk_r0, 0, PMK_LEN);
1493 return -1;
1494 }
1495 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1496 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1497 WPA_PMK_NAME_LEN);
1498 r.pairwise = host_to_le16(pairwise);
1499 os_memset(r.pad, 0, sizeof(r.pad));
1500
1501 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1502 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1503 r.nonce, resp.nonce) < 0) {
1504 os_memset(pmk_r0, 0, PMK_LEN);
1505 return -1;
1506 }
1507
1508 os_memset(pmk_r0, 0, PMK_LEN);
1509
1510 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1511
1512 return 0;
1513 }
1514
1515
1516 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1517 {
1518 struct wpa_state_machine *sm = eloop_ctx;
1519 int res;
1520 u8 *resp_ies;
1521 size_t resp_ies_len;
1522 u16 status;
1523
1524 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1525 wpabuf_len(sm->ft_pending_req_ies),
1526 &resp_ies, &resp_ies_len);
1527 wpabuf_free(sm->ft_pending_req_ies);
1528 sm->ft_pending_req_ies = NULL;
1529 if (res < 0)
1530 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1531 status = res;
1532 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1533 " - status %u", MAC2STR(sm->addr), status);
1534
1535 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1536 sm->ft_pending_auth_transaction + 1, status,
1537 resp_ies, resp_ies_len);
1538 os_free(resp_ies);
1539 }
1540
1541
1542 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1543 {
1544 struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1545
1546 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0 ||
1547 os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1548 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0 ||
1549 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1550 return 0;
1551
1552 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1553 MACSTR " - process from timeout", MAC2STR(sm->addr));
1554 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1555 return 1;
1556 }
1557
1558
1559 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1560 const u8 *src_addr,
1561 const u8 *data, size_t data_len)
1562 {
1563 struct ft_r0kh_r1kh_resp_frame f;
1564 const u8 *crypt;
1565 u8 *plain;
1566 struct ft_remote_r0kh *r0kh;
1567 int pairwise, res;
1568
1569 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1570
1571 if (data_len < sizeof(f))
1572 return -1;
1573
1574 r0kh = wpa_auth->conf.r0kh_list;
1575 while (r0kh) {
1576 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1577 break;
1578 r0kh = r0kh->next;
1579 }
1580 if (r0kh == NULL) {
1581 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1582 "PMK-R0 pull response source address " MACSTR,
1583 MAC2STR(src_addr));
1584 return -1;
1585 }
1586
1587 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1588 os_memset(&f, 0, sizeof(f));
1589 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1590 /* aes_unwrap() does not support inplace decryption, so use a temporary
1591 * buffer for the data. */
1592 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1593 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1594 crypt, plain) < 0) {
1595 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1596 "response from " MACSTR, MAC2STR(src_addr));
1597 return -1;
1598 }
1599
1600 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1601 FT_R1KH_ID_LEN) != 0) {
1602 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1603 "matching R1KH-ID");
1604 return -1;
1605 }
1606
1607 pairwise = le_to_host16(f.pairwise);
1608 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1609 f.nonce, sizeof(f.nonce));
1610 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1611 MACSTR " pairwise=0x%x",
1612 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1613 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1614 f.pmk_r1, PMK_LEN);
1615 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1616 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1617
1618 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1619 pairwise);
1620 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1621 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1622 os_memset(f.pmk_r1, 0, PMK_LEN);
1623
1624 return res ? 0 : -1;
1625 }
1626
1627
1628 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1629 const u8 *src_addr,
1630 const u8 *data, size_t data_len)
1631 {
1632 struct ft_r0kh_r1kh_push_frame f;
1633 const u8 *crypt;
1634 u8 *plain;
1635 struct ft_remote_r0kh *r0kh;
1636 struct os_time now;
1637 os_time_t tsend;
1638 int pairwise;
1639
1640 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1641
1642 if (data_len < sizeof(f))
1643 return -1;
1644
1645 r0kh = wpa_auth->conf.r0kh_list;
1646 while (r0kh) {
1647 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1648 break;
1649 r0kh = r0kh->next;
1650 }
1651 if (r0kh == NULL) {
1652 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1653 "PMK-R0 push source address " MACSTR,
1654 MAC2STR(src_addr));
1655 return -1;
1656 }
1657
1658 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp);
1659 os_memset(&f, 0, sizeof(f));
1660 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1661 timestamp);
1662 /* aes_unwrap() does not support inplace decryption, so use a temporary
1663 * buffer for the data. */
1664 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1665 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1666 crypt, plain) < 0) {
1667 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1668 MACSTR, MAC2STR(src_addr));
1669 return -1;
1670 }
1671
1672 os_get_time(&now);
1673 tsend = WPA_GET_LE32(f.timestamp);
1674 if ((now.sec > tsend && now.sec - tsend > 60) ||
1675 (now.sec < tsend && tsend - now.sec > 60)) {
1676 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1677 "timestamp: sender time %d own time %d\n",
1678 (int) tsend, (int) now.sec);
1679 return -1;
1680 }
1681
1682 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1683 FT_R1KH_ID_LEN) != 0) {
1684 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1685 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1686 MAC2STR(f.r1kh_id),
1687 MAC2STR(wpa_auth->conf.r1_key_holder));
1688 return -1;
1689 }
1690
1691 pairwise = le_to_host16(f.pairwise);
1692 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1693 MACSTR " pairwise=0x%x",
1694 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1695 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1696 f.pmk_r1, PMK_LEN);
1697 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1698 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1699
1700 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1701 pairwise);
1702 os_memset(f.pmk_r1, 0, PMK_LEN);
1703
1704 return 0;
1705 }
1706
1707
1708 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1709 const u8 *data, size_t data_len)
1710 {
1711 struct ft_rrb_frame *frame;
1712 u16 alen;
1713 const u8 *pos, *end, *start;
1714 u8 action;
1715 const u8 *sta_addr, *target_ap_addr;
1716
1717 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1718 MAC2STR(src_addr));
1719
1720 if (data_len < sizeof(*frame)) {
1721 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1722 (unsigned long) data_len);
1723 return -1;
1724 }
1725
1726 pos = data;
1727 frame = (struct ft_rrb_frame *) pos;
1728 pos += sizeof(*frame);
1729
1730 alen = le_to_host16(frame->action_length);
1731 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1732 "action_length=%d ap_address=" MACSTR,
1733 frame->frame_type, frame->packet_type, alen,
1734 MAC2STR(frame->ap_address));
1735
1736 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1737 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1738 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1739 "unrecognized type %d", frame->frame_type);
1740 return -1;
1741 }
1742
1743 if (alen > data_len - sizeof(*frame)) {
1744 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1745 "frame");
1746 return -1;
1747 }
1748
1749 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1750 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1751 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1752 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1753 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1754 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1755
1756 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1757
1758 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1759 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1760 "room for Action Frame body); alen=%lu",
1761 (unsigned long) alen);
1762 return -1;
1763 }
1764 start = pos;
1765 end = pos + alen;
1766
1767 if (*pos != WLAN_ACTION_FT) {
1768 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1769 "%d", *pos);
1770 return -1;
1771 }
1772
1773 pos++;
1774 action = *pos++;
1775 sta_addr = pos;
1776 pos += ETH_ALEN;
1777 target_ap_addr = pos;
1778 pos += ETH_ALEN;
1779 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1780 MACSTR " target_ap_addr=" MACSTR,
1781 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1782
1783 if (frame->packet_type == FT_PACKET_REQUEST) {
1784 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1785
1786 if (action != 1) {
1787 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1788 "RRB Request", action);
1789 return -1;
1790 }
1791
1792 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1793 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1794 "RRB Request does not match with own "
1795 "address");
1796 return -1;
1797 }
1798
1799 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1800 sta_addr, pos, end - pos) < 0)
1801 return -1;
1802 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1803 u16 status_code;
1804
1805 if (end - pos < 2) {
1806 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1807 "code in RRB Response");
1808 return -1;
1809 }
1810 status_code = WPA_GET_LE16(pos);
1811 pos += 2;
1812
1813 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1814 "(status_code=%d)", status_code);
1815
1816 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1817 return -1;
1818 } else {
1819 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1820 "packet_type %d", frame->packet_type);
1821 return -1;
1822 }
1823
1824 if (end > pos) {
1825 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1826 pos, end - pos);
1827 }
1828
1829 return 0;
1830 }
1831
1832
1833 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1834 struct wpa_ft_pmk_r0_sa *pmk_r0,
1835 struct ft_remote_r1kh *r1kh,
1836 const u8 *s1kh_id, int pairwise)
1837 {
1838 struct ft_r0kh_r1kh_push_frame frame, f;
1839 struct os_time now;
1840 const u8 *plain;
1841 u8 *crypt;
1842
1843 os_memset(&frame, 0, sizeof(frame));
1844 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1845 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1846 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1847 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1848
1849 /* aes_wrap() does not support inplace encryption, so use a temporary
1850 * buffer for the data. */
1851 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1852 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1853 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1854 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1855 s1kh_id, f.pmk_r1, f.pmk_r1_name) < 0)
1856 return -1;
1857 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1858 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1859 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1860 WPA_PMK_NAME_LEN);
1861 os_get_time(&now);
1862 WPA_PUT_LE32(f.timestamp, now.sec);
1863 f.pairwise = host_to_le16(pairwise);
1864 os_memset(f.pad, 0, sizeof(f.pad));
1865 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1866 timestamp);
1867 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame,
1868 timestamp);
1869 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1870 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1871 plain, crypt) < 0)
1872 return -1;
1873
1874 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1875 return 0;
1876 }
1877
1878
1879 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1880 {
1881 struct wpa_ft_pmk_r0_sa *r0;
1882 struct ft_remote_r1kh *r1kh;
1883
1884 if (!wpa_auth->conf.pmk_r1_push)
1885 return;
1886
1887 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1888 while (r0) {
1889 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1890 break;
1891 r0 = r0->next;
1892 }
1893
1894 if (r0 == NULL || r0->pmk_r1_pushed)
1895 return;
1896 r0->pmk_r1_pushed = 1;
1897
1898 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1899 "for STA " MACSTR, MAC2STR(addr));
1900
1901 r1kh = wpa_auth->conf.r1kh_list;
1902 while (r1kh) {
1903 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1904 r1kh = r1kh->next;
1905 }
1906 }
1907
1908 #endif /* CONFIG_IEEE80211R_AP */
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