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[netbsd-mini2440.git] / dist / wpa / hostapd / wpa_ft.c
blob44249e2039a3b2d4af147cc448c5bf61f36fc8a3
1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "config.h"
19 #include "wpa.h"
20 #include "aes_wrap.h"
21 #include "ieee802_11.h"
22 #include "defs.h"
23 #include "wpa_auth_i.h"
24 #include "wpa_auth_ie.h"
25
26
27 #ifdef CONFIG_IEEE80211R
28
29 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
30 const u8 *data, size_t data_len)
31 {
32 if (wpa_auth->cb.send_ether == NULL)
33 return -1;
34 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
35 data, data_len);
36 }
37
38
39 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
40 const u8 *dst, const u8 *data, size_t data_len)
41 {
42 if (wpa_auth->cb.send_ft_action == NULL)
43 return -1;
44 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
45 data, data_len);
46 }
47
48
49 static struct wpa_state_machine *
50 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
51 {
52 if (wpa_auth->cb.add_sta == NULL)
53 return NULL;
54 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
55 }
56
57
58 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
59 {
60 u8 *pos = buf;
61 u8 capab;
62 if (len < 2 + sizeof(struct rsn_mdie))
63 return -1;
64
65 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
66 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
67 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
68 pos += MOBILITY_DOMAIN_ID_LEN;
69 capab = RSN_FT_CAPAB_FT_OVER_DS;
70 *pos++ = capab;
71
72 return pos - buf;
73 }
74
75
76 static int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
77 size_t r0kh_id_len,
78 const u8 *anonce, const u8 *snonce,
79 u8 *buf, size_t len, const u8 *subelem,
80 size_t subelem_len)
81 {
82 u8 *pos = buf, *ielen;
83 struct rsn_ftie *hdr;
84
85 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
86 subelem_len)
87 return -1;
88
89 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
90 ielen = pos++;
91
92 hdr = (struct rsn_ftie *) pos;
93 os_memset(hdr, 0, sizeof(*hdr));
94 pos += sizeof(*hdr);
95 WPA_PUT_LE16(hdr->mic_control, 0);
96 if (anonce)
97 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
98 if (snonce)
99 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
100
101 /* Optional Parameters */
102 *pos++ = FTIE_SUBELEM_R1KH_ID;
103 *pos++ = FT_R1KH_ID_LEN;
104 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
105 pos += FT_R1KH_ID_LEN;
106
107 if (r0kh_id) {
108 *pos++ = FTIE_SUBELEM_R0KH_ID;
109 *pos++ = r0kh_id_len;
110 os_memcpy(pos, r0kh_id, r0kh_id_len);
111 pos += r0kh_id_len;
112 }
113
114 if (subelem) {
115 os_memcpy(pos, subelem, subelem_len);
116 pos += subelem_len;
117 }
118
119 *ielen = pos - buf - 2;
120
121 return pos - buf;
122 }
123
124
125 struct wpa_ft_pmk_r0_sa {
126 struct wpa_ft_pmk_r0_sa *next;
127 u8 pmk_r0[PMK_LEN];
128 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
129 u8 spa[ETH_ALEN];
130 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
131 int pmk_r1_pushed;
132 };
133
134 struct wpa_ft_pmk_r1_sa {
135 struct wpa_ft_pmk_r1_sa *next;
136 u8 pmk_r1[PMK_LEN];
137 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
138 u8 spa[ETH_ALEN];
139 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
140 };
141
142 struct wpa_ft_pmk_cache {
143 struct wpa_ft_pmk_r0_sa *pmk_r0;
144 struct wpa_ft_pmk_r1_sa *pmk_r1;
145 };
146
147 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
148 {
149 struct wpa_ft_pmk_cache *cache;
150
151 cache = os_zalloc(sizeof(*cache));
152
153 return cache;
154 }
155
156
157 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
158 {
159 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
160 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
161
162 r0 = cache->pmk_r0;
163 while (r0) {
164 r0prev = r0;
165 r0 = r0->next;
166 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
167 os_free(r0prev);
168 }
169
170 r1 = cache->pmk_r1;
171 while (r1) {
172 r1prev = r1;
173 r1 = r1->next;
174 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
175 os_free(r1prev);
176 }
177
178 os_free(cache);
179 }
180
181
182 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
183 const u8 *spa, const u8 *pmk_r0,
184 const u8 *pmk_r0_name)
185 {
186 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
187 struct wpa_ft_pmk_r0_sa *r0;
188
189 /* TODO: add expiration and limit on number of entries in cache */
190
191 r0 = os_zalloc(sizeof(*r0));
192 if (r0 == NULL)
193 return -1;
194
195 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
196 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
197 os_memcpy(r0->spa, spa, ETH_ALEN);
198
199 r0->next = cache->pmk_r0;
200 cache->pmk_r0 = r0;
201
202 return 0;
203 }
204
205
206 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
207 const u8 *spa, const u8 *pmk_r0_name,
208 u8 *pmk_r0)
209 {
210 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
211 struct wpa_ft_pmk_r0_sa *r0;
212
213 r0 = cache->pmk_r0;
214 while (r0) {
215 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
216 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
217 == 0) {
218 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
219 return 0;
220 }
221
222 r0 = r0->next;
223 }
224
225 return -1;
226 }
227
228
229 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
230 const u8 *spa, const u8 *pmk_r1,
231 const u8 *pmk_r1_name)
232 {
233 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
234 struct wpa_ft_pmk_r1_sa *r1;
235
236 /* TODO: add expiration and limit on number of entries in cache */
237
238 r1 = os_zalloc(sizeof(*r1));
239 if (r1 == NULL)
240 return -1;
241
242 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
243 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
244 os_memcpy(r1->spa, spa, ETH_ALEN);
245
246 r1->next = cache->pmk_r1;
247 cache->pmk_r1 = r1;
248
249 return 0;
250 }
251
252
253 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
254 const u8 *spa, const u8 *pmk_r1_name,
255 u8 *pmk_r1)
256 {
257 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
258 struct wpa_ft_pmk_r1_sa *r1;
259
260 r1 = cache->pmk_r1;
261 while (r1) {
262 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
263 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
264 == 0) {
265 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
266 return 0;
267 }
268
269 r1 = r1->next;
270 }
271
272 return -1;
273 }
274
275
276 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
277 const u8 *s1kh_id, const u8 *r0kh_id,
278 size_t r0kh_id_len, const u8 *pmk_r0_name)
279 {
280 struct ft_remote_r0kh *r0kh;
281 struct ft_r0kh_r1kh_pull_frame frame, f;
282
283 r0kh = wpa_auth->conf.r0kh_list;
284 while (r0kh) {
285 if (r0kh->id_len == r0kh_id_len &&
286 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
287 break;
288 r0kh = r0kh->next;
289 }
290 if (r0kh == NULL)
291 return -1;
292
293 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
294 "address " MACSTR, MAC2STR(r0kh->addr));
295
296 os_memset(&frame, 0, sizeof(frame));
297 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
298 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
299 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
300 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
301
302 /* aes_wrap() does not support inplace encryption, so use a temporary
303 * buffer for the data. */
304 if (os_get_random(f.nonce, sizeof(f.nonce))) {
305 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
306 "nonce");
307 return -1;
308 }
309 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
310 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
311 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
312
313 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
314 f.nonce, frame.nonce) < 0)
315 return -1;
316
317 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
318
319 return 0;
320 }
321
322
323 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
324 struct wpa_ptk *ptk)
325 {
326 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
327 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
328 u8 ptk_name[WPA_PMK_NAME_LEN];
329 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
330 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
331 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
332 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
333 const u8 *ssid = sm->wpa_auth->conf.ssid;
334 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
335
336
337 if (sm->xxkey_len == 0) {
338 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
339 "derivation");
340 return -1;
341 }
342
343 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
344 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
345 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
346 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
347 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name);
348
349 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
350 pmk_r1, pmk_r1_name);
351 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
352 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
353 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_name);
354
355 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
356 sm->wpa_auth->addr, pmk_r1_name,
357 (u8 *) ptk, sizeof(*ptk), ptk_name);
358 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk));
359 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
360
361 return 0;
362 }
363
364
365 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
366 const u8 *addr, int idx, u8 *seq)
367 {
368 if (wpa_auth->cb.get_seqnum == NULL)
369 return -1;
370 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
371 }
372
373
374 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
375 {
376 u8 *subelem;
377 struct wpa_group *gsm = sm->group;
378 size_t subelem_len, pad_len;
379 const u8 *key;
380 size_t key_len;
381 u8 keybuf[32];
382
383 key_len = gsm->GTK_len;
384 if (key_len > sizeof(keybuf))
385 return NULL;
386
387 /*
388 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
389 * than 16 bytes.
390 */
391 pad_len = key_len % 8;
392 if (pad_len)
393 pad_len = 8 - pad_len;
394 if (key_len + pad_len < 16)
395 pad_len += 8;
396 if (pad_len) {
397 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
398 os_memset(keybuf + key_len, 0, pad_len);
399 keybuf[key_len] = 0xdd;
400 key_len += pad_len;
401 key = keybuf;
402 } else
403 key = gsm->GTK[gsm->GN - 1];
404
405 /*
406 * Sub-elem ID[1] | Length[1] | Key Info[1] | Key Length[1] | RSC[8] |
407 * Key[5..32].
408 */
409 subelem_len = 12 + key_len + 8;
410 subelem = os_zalloc(subelem_len);
411 if (subelem == NULL)
412 return NULL;
413
414 subelem[0] = FTIE_SUBELEM_GTK;
415 subelem[1] = 10 + key_len + 8;
416 subelem[2] = gsm->GN & 0x03; /* Key ID in B0-B1 of Key Info */
417 subelem[3] = gsm->GTK_len;
418 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 4);
419 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 12)) {
420 os_free(subelem);
421 return NULL;
422 }
423
424 *len = subelem_len;
425 return subelem;
426 }
427
428
429 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
430 size_t max_len, int auth_alg)
431 {
432 u8 *end, *mdie, *ftie, *rsnie, *r0kh_id, *subelem = NULL;
433 size_t mdie_len, ftie_len, rsnie_len, r0kh_id_len, subelem_len = 0;
434 int res;
435 struct wpa_auth_config *conf;
436 struct rsn_ftie *_ftie;
437
438 if (sm == NULL)
439 return pos;
440
441 conf = &sm->wpa_auth->conf;
442
443 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
444 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
445 return pos;
446
447 end = pos + max_len;
448
449 /* RSN */
450 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
451 if (res < 0)
452 return pos;
453 rsnie = pos;
454 rsnie_len = res;
455 pos += res;
456
457 /* Mobility Domain Information */
458 res = wpa_write_mdie(conf, pos, end - pos);
459 if (res < 0)
460 return pos;
461 mdie = pos;
462 mdie_len = res;
463 pos += res;
464
465 /* Fast BSS Transition Information */
466 if (auth_alg == WLAN_AUTH_FT) {
467 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
468 r0kh_id = sm->r0kh_id;
469 r0kh_id_len = sm->r0kh_id_len;
470 } else {
471 r0kh_id = conf->r0_key_holder;
472 r0kh_id_len = conf->r0_key_holder_len;
473 }
474 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, NULL, NULL, pos,
475 end - pos, subelem, subelem_len);
476 os_free(subelem);
477 if (res < 0)
478 return pos;
479 ftie = pos;
480 ftie_len = res;
481 pos += res;
482
483 _ftie = (struct rsn_ftie *) (ftie + 2);
484 _ftie->mic_control[1] = 3; /* Information element count */
485 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
486 mdie, mdie_len, ftie, ftie_len,
487 rsnie, rsnie_len, NULL, 0, _ftie->mic) < 0)
488 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
489
490 return pos;
491 }
492
493
494 struct wpa_ft_ies {
495 const u8 *mdie;
496 size_t mdie_len;
497 const u8 *ftie;
498 size_t ftie_len;
499 const u8 *r1kh_id;
500 const u8 *gtk;
501 size_t gtk_len;
502 const u8 *r0kh_id;
503 size_t r0kh_id_len;
504 const u8 *rsn;
505 size_t rsn_len;
506 const u8 *rsn_pmkid;
507 };
508
509
510 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
511 struct wpa_ft_ies *parse)
512 {
513 const u8 *end, *pos;
514
515 parse->ftie = ie;
516 parse->ftie_len = ie_len;
517
518 pos = ie + sizeof(struct rsn_ftie);
519 end = ie + ie_len;
520
521 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
522 switch (pos[0]) {
523 case FTIE_SUBELEM_R1KH_ID:
524 if (pos[1] != FT_R1KH_ID_LEN) {
525 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
526 "length in FTIE: %d", pos[1]);
527 return -1;
528 }
529 parse->r1kh_id = pos + 2;
530 break;
531 case FTIE_SUBELEM_GTK:
532 parse->gtk = pos + 2;
533 parse->gtk_len = pos[1];
534 break;
535 case FTIE_SUBELEM_R0KH_ID:
536 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
537 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
538 "length in FTIE: %d", pos[1]);
539 return -1;
540 }
541 parse->r0kh_id = pos + 2;
542 parse->r0kh_id_len = pos[1];
543 break;
544 }
545
546 pos += 2 + pos[1];
547 }
548
549 return 0;
550 }
551
552
553 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
554 struct wpa_ft_ies *parse)
555 {
556 const u8 *end, *pos;
557 struct wpa_ie_data data;
558 int ret;
559
560 os_memset(parse, 0, sizeof(*parse));
561 if (ies == NULL)
562 return 0;
563
564 pos = ies;
565 end = ies + ies_len;
566 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
567 switch (pos[0]) {
568 case WLAN_EID_RSN:
569 parse->rsn = pos + 2;
570 parse->rsn_len = pos[1];
571 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
572 parse->rsn_len + 2,
573 &data);
574 if (ret < 0) {
575 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
576 "RSN IE: %d", ret);
577 return -1;
578 }
579 if (data.num_pmkid == 1 && data.pmkid)
580 parse->rsn_pmkid = data.pmkid;
581 break;
582 case WLAN_EID_MOBILITY_DOMAIN:
583 parse->mdie = pos + 2;
584 parse->mdie_len = pos[1];
585 break;
586 case WLAN_EID_FAST_BSS_TRANSITION:
587 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
588 return -1;
589 break;
590 }
591
592 pos += 2 + pos[1];
593 }
594
595 return 0;
596 }
597
598
599 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
600 int vlan_id,
601 const char *alg, const u8 *addr, int idx,
602 u8 *key, size_t key_len)
603 {
604 if (wpa_auth->cb.set_key == NULL)
605 return -1;
606 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
607 key, key_len);
608 }
609
610
611 static void wpa_ft_install_ptk(struct wpa_state_machine *sm)
612 {
613 char *alg;
614 int klen;
615
616 /* MLME-SETKEYS.request(PTK) */
617 if (sm->pairwise == WPA_CIPHER_TKIP) {
618 alg = "TKIP";
619 klen = 32;
620 } else if (sm->pairwise == WPA_CIPHER_CCMP) {
621 alg = "CCMP";
622 klen = 16;
623 } else
624 return;
625
626 /* FIX: add STA entry to kernel/driver here? The set_key will fail
627 * most likely without this.. At the moment, STA entry is added only
628 * after association has been completed. Alternatively, could
629 * re-configure PTK at that point(?).
630 */
631 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
632 sm->PTK.tk1, klen))
633 return;
634
635 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
636 sm->pairwise_set = TRUE;
637 }
638
639
640 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
641 const u8 *ies, size_t ies_len,
642 u8 **resp_ies, size_t *resp_ies_len)
643 {
644 struct rsn_mdie *mdie;
645 struct rsn_ftie *ftie;
646 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
647 u8 ptk_name[WPA_PMK_NAME_LEN];
648 struct wpa_auth_config *conf;
649 struct wpa_ft_ies parse;
650 size_t buflen;
651 int ret;
652 u8 *pos, *end;
653
654 *resp_ies = NULL;
655 *resp_ies_len = 0;
656
657 sm->pmk_r1_name_valid = 0;
658 conf = &sm->wpa_auth->conf;
659
660 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
661 ies, ies_len);
662
663 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
664 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
665 return WLAN_STATUS_UNSPECIFIED_FAILURE;
666 }
667
668 mdie = (struct rsn_mdie *) parse.mdie;
669 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
670 os_memcmp(mdie->mobility_domain,
671 sm->wpa_auth->conf.mobility_domain,
672 MOBILITY_DOMAIN_ID_LEN) != 0) {
673 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
674 return WLAN_STATUS_INVALID_MDIE;
675 }
676
677 ftie = (struct rsn_ftie *) parse.ftie;
678 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
679 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
680 return WLAN_STATUS_INVALID_FTIE;
681 }
682
683 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
684
685 if (parse.r0kh_id == NULL) {
686 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
687 return WLAN_STATUS_INVALID_FTIE;
688 }
689
690 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
691 parse.r0kh_id, parse.r0kh_id_len);
692 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
693 sm->r0kh_id_len = parse.r0kh_id_len;
694
695 if (parse.rsn_pmkid == NULL) {
696 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
697 return WLAN_STATUS_INVALID_PMKID;
698 }
699
700 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
701 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
702 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
703 sm->wpa_auth->conf.r1_key_holder, sm->addr,
704 pmk_r1_name);
705 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
706 pmk_r1_name, WPA_PMK_NAME_LEN);
707
708 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1) <
709 0) {
710 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
711 sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
712 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
713 "PMK-R1 and unknown R0KH-ID");
714 return WLAN_STATUS_INVALID_PMKID;
715 }
716
717 /*
718 * TODO: Should return "status pending" (and the caller should
719 * not send out response now). The real response will be sent
720 * once the response from R0KH is received.
721 */
722 return WLAN_STATUS_INVALID_PMKID;
723 }
724
725 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
726 sm->pmk_r1_name_valid = 1;
727 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
728
729 if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) {
730 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
731 "ANonce");
732 return WLAN_STATUS_UNSPECIFIED_FAILURE;
733 }
734
735 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
736 sm->SNonce, WPA_NONCE_LEN);
737 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
738 sm->ANonce, WPA_NONCE_LEN);
739
740 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
741 sm->wpa_auth->addr, pmk_r1_name,
742 (u8 *) &sm->PTK, sizeof(sm->PTK), ptk_name);
743 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
744 (u8 *) &sm->PTK, sizeof(sm->PTK));
745 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
746
747 wpa_ft_install_ptk(sm);
748
749 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
750 2 + FT_R1KH_ID_LEN + 200;
751 *resp_ies = os_zalloc(buflen);
752 if (*resp_ies == NULL) {
753 return WLAN_STATUS_UNSPECIFIED_FAILURE;
754 }
755
756 pos = *resp_ies;
757 end = *resp_ies + buflen;
758
759 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
760 if (ret < 0) {
761 os_free(*resp_ies);
762 *resp_ies = NULL;
763 return WLAN_STATUS_UNSPECIFIED_FAILURE;
764 }
765 pos += ret;
766
767 ret = wpa_write_mdie(conf, pos, end - pos);
768 if (ret < 0) {
769 os_free(*resp_ies);
770 *resp_ies = NULL;
771 return WLAN_STATUS_UNSPECIFIED_FAILURE;
772 }
773 pos += ret;
774
775 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
776 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
777 if (ret < 0) {
778 os_free(*resp_ies);
779 *resp_ies = NULL;
780 return WLAN_STATUS_UNSPECIFIED_FAILURE;
781 }
782 pos += ret;
783
784 *resp_ies_len = pos - *resp_ies;
785
786 return WLAN_STATUS_SUCCESS;
787 }
788
789
790 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
791 u16 auth_transaction, const u8 *ies, size_t ies_len,
792 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
793 u16 auth_transaction, u16 status,
794 const u8 *ies, size_t ies_len),
795 void *ctx)
796 {
797 u16 status;
798 u8 *resp_ies;
799 size_t resp_ies_len;
800
801 if (sm == NULL) {
802 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
803 "WPA SM not available");
804 return;
805 }
806
807 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
808 " BSSID=" MACSTR " transaction=%d",
809 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
810 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
811 &resp_ies_len);
812
813 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
814 " auth_transaction=%d status=%d",
815 MAC2STR(sm->addr), auth_transaction + 1, status);
816 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
817 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
818 resp_ies, resp_ies_len);
819 os_free(resp_ies);
820 }
821
822
823 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
824 size_t ies_len)
825 {
826 struct wpa_ft_ies parse;
827 struct rsn_mdie *mdie;
828 struct rsn_ftie *ftie;
829 u8 mic[16];
830
831 if (sm == NULL)
832 return WLAN_STATUS_UNSPECIFIED_FAILURE;
833
834 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
835
836 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
837 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
838 return WLAN_STATUS_UNSPECIFIED_FAILURE;
839 }
840
841 if (parse.rsn == NULL) {
842 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
843 return WLAN_STATUS_UNSPECIFIED_FAILURE;
844 }
845
846 if (parse.rsn_pmkid == NULL) {
847 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
848 return WLAN_STATUS_INVALID_PMKID;
849 }
850
851 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
852 {
853 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
854 "with the PMKR1Name derived from auth request");
855 return WLAN_STATUS_INVALID_PMKID;
856 }
857
858 mdie = (struct rsn_mdie *) parse.mdie;
859 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
860 os_memcmp(mdie->mobility_domain,
861 sm->wpa_auth->conf.mobility_domain,
862 MOBILITY_DOMAIN_ID_LEN) != 0) {
863 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
864 return WLAN_STATUS_INVALID_MDIE;
865 }
866
867 ftie = (struct rsn_ftie *) parse.ftie;
868 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
869 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
870 return WLAN_STATUS_INVALID_FTIE;
871 }
872
873 /*
874 * Assume that MDIE, FTIE, and RSN IE are protected and that there is
875 * no RIC, so total of 3 protected IEs.
876 */
877 if (ftie->mic_control[1] != 3) {
878 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
879 ftie->mic_control[1]);
880 return WLAN_STATUS_INVALID_FTIE;
881 }
882
883 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
884 parse.mdie - 2, parse.mdie_len + 2,
885 parse.ftie - 2, parse.ftie_len + 2,
886 parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
887 mic) < 0) {
888 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
889 return WLAN_STATUS_UNSPECIFIED_FAILURE;
890 }
891
892 if (os_memcmp(mic, ftie->mic, 16) != 0) {
893 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
894 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
895 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
896 return WLAN_STATUS_INVALID_FTIE;
897 }
898
899 return WLAN_STATUS_SUCCESS;
900 }
901
902
903 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
904 {
905 const u8 *sta_addr, *target_ap;
906 const u8 *ies;
907 size_t ies_len;
908 u8 action;
909 struct ft_rrb_frame *frame;
910
911 if (sm == NULL)
912 return -1;
913
914 /*
915 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
916 * FT Request action frame body[variable]
917 */
918
919 if (len < 14) {
920 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
921 "(len=%lu)", (unsigned long) len);
922 return -1;
923 }
924
925 action = data[1];
926 sta_addr = data + 2;
927 target_ap = data + 8;
928 ies = data + 14;
929 ies_len = len - 14;
930
931 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
932 " Target AP=" MACSTR " Action=%d)",
933 MAC2STR(sta_addr), MAC2STR(target_ap), action);
934
935 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
936 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
937 "STA=" MACSTR " STA-Address=" MACSTR,
938 MAC2STR(sm->addr), MAC2STR(sta_addr));
939 return -1;
940 }
941
942 /*
943 * Do some sanity checking on the target AP address (not own and not
944 * broadcast. This could be extended to filter based on a list of known
945 * APs in the MD (if such a list were configured).
946 */
947 if ((target_ap[0] & 0x01) ||
948 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
949 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
950 "frame");
951 return -1;
952 }
953
954 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
955
956 /* RRB - Forward action frame to the target AP */
957 frame = os_malloc(sizeof(*frame) + len);
958 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
959 frame->packet_type = FT_PACKET_REQUEST;
960 frame->action_length = host_to_le16(len);
961 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
962 os_memcpy(frame + 1, data, len);
963
964 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
965 sizeof(*frame) + len);
966 os_free(frame);
967
968 return 0;
969 }
970
971
972 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
973 const u8 *current_ap, const u8 *sta_addr,
974 const u8 *body, size_t len)
975 {
976 struct wpa_state_machine *sm;
977 u16 status;
978 u8 *resp_ies, *pos;
979 size_t resp_ies_len, rlen;
980 struct ft_rrb_frame *frame;
981
982 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
983 if (sm == NULL) {
984 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
985 "RRB Request");
986 return -1;
987 }
988
989 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
990
991 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
992 &resp_ies_len);
993
994 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
995 " CurrentAP=" MACSTR " status=%d",
996 MAC2STR(sm->addr), MAC2STR(current_ap), status);
997 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
998
999 /* RRB - Forward action frame response to the Current AP */
1000
1001 /*
1002 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1003 * Status_Code[2] FT Request action frame body[variable]
1004 */
1005 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1006
1007 frame = os_malloc(sizeof(*frame) + rlen);
1008 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1009 frame->packet_type = FT_PACKET_RESPONSE;
1010 frame->action_length = host_to_le16(rlen);
1011 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1012 pos = (u8 *) (frame + 1);
1013 *pos++ = WLAN_ACTION_FT;
1014 *pos++ = 2; /* Action: Response */
1015 os_memcpy(pos, sta_addr, ETH_ALEN);
1016 pos += ETH_ALEN;
1017 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1018 pos += ETH_ALEN;
1019 WPA_PUT_LE16(pos, status);
1020 pos += 2;
1021 if (resp_ies) {
1022 os_memcpy(pos, resp_ies, resp_ies_len);
1023 os_free(resp_ies);
1024 }
1025
1026 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1027 sizeof(*frame) + rlen);
1028 os_free(frame);
1029
1030 return 0;
1031 }
1032
1033
1034 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1035 const u8 *src_addr,
1036 const u8 *data, size_t data_len)
1037 {
1038 struct ft_r0kh_r1kh_pull_frame *frame, f;
1039 struct ft_remote_r1kh *r1kh;
1040 struct ft_r0kh_r1kh_resp_frame resp, r;
1041 u8 pmk_r0[PMK_LEN];
1042
1043 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1044
1045 if (data_len < sizeof(*frame))
1046 return -1;
1047
1048 r1kh = wpa_auth->conf.r1kh_list;
1049 while (r1kh) {
1050 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1051 break;
1052 r1kh = r1kh->next;
1053 }
1054 if (r1kh == NULL) {
1055 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1056 "PMK-R1 pull source address " MACSTR,
1057 MAC2STR(src_addr));
1058 return -1;
1059 }
1060
1061 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1062 /* aes_unwrap() does not support inplace decryption, so use a temporary
1063 * buffer for the data. */
1064 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1065 frame->nonce, f.nonce) < 0) {
1066 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1067 "request from " MACSTR, MAC2STR(src_addr));
1068 return -1;
1069 }
1070
1071 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1072 f.nonce, sizeof(f.nonce));
1073 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1074 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1075 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1076 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1077
1078 os_memset(&resp, 0, sizeof(resp));
1079 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1080 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1081 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1082 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1083
1084 /* aes_wrap() does not support inplace encryption, so use a temporary
1085 * buffer for the data. */
1086 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1087 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1088 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1089 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0) <
1090 0) {
1091 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1092 "PMK-R1 pull");
1093 return -1;
1094 }
1095
1096 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1097 r.pmk_r1, r.pmk_r1_name);
1098 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1099 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1100 WPA_PMK_NAME_LEN);
1101
1102 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1103 r.nonce, resp.nonce) < 0) {
1104 os_memset(pmk_r0, 0, PMK_LEN);
1105 return -1;
1106 }
1107
1108 os_memset(pmk_r0, 0, PMK_LEN);
1109
1110 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1111
1112 return 0;
1113 }
1114
1115
1116 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1117 const u8 *src_addr,
1118 const u8 *data, size_t data_len)
1119 {
1120 struct ft_r0kh_r1kh_resp_frame *frame, f;
1121 struct ft_remote_r0kh *r0kh;
1122
1123 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1124
1125 if (data_len < sizeof(*frame))
1126 return -1;
1127
1128 r0kh = wpa_auth->conf.r0kh_list;
1129 while (r0kh) {
1130 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1131 break;
1132 r0kh = r0kh->next;
1133 }
1134 if (r0kh == NULL) {
1135 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1136 "PMK-R0 pull response source address " MACSTR,
1137 MAC2STR(src_addr));
1138 return -1;
1139 }
1140
1141 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1142 /* aes_unwrap() does not support inplace decryption, so use a temporary
1143 * buffer for the data. */
1144 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1145 frame->nonce, f.nonce) < 0) {
1146 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1147 "response from " MACSTR, MAC2STR(src_addr));
1148 return -1;
1149 }
1150
1151 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1152 != 0) {
1153 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1154 "matching R1KH-ID");
1155 return -1;
1156 }
1157
1158 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1159 * and call this requests callback function to finish request
1160 * processing */
1161
1162 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1163 f.nonce, sizeof(f.nonce));
1164 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1165 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1166 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1167 f.pmk_r1, PMK_LEN);
1168 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1169 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1170
1171 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
1172 os_memset(f.pmk_r1, 0, PMK_LEN);
1173
1174 return 0;
1175 }
1176
1177
1178 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1179 const u8 *src_addr,
1180 const u8 *data, size_t data_len)
1181 {
1182 struct ft_r0kh_r1kh_push_frame *frame, f;
1183 struct ft_remote_r0kh *r0kh;
1184 struct os_time now;
1185 os_time_t tsend;
1186
1187 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1188
1189 if (data_len < sizeof(*frame))
1190 return -1;
1191
1192 r0kh = wpa_auth->conf.r0kh_list;
1193 while (r0kh) {
1194 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1195 break;
1196 r0kh = r0kh->next;
1197 }
1198 if (r0kh == NULL) {
1199 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1200 "PMK-R0 push source address " MACSTR,
1201 MAC2STR(src_addr));
1202 return -1;
1203 }
1204
1205 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1206 /* aes_unwrap() does not support inplace decryption, so use a temporary
1207 * buffer for the data. */
1208 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1209 frame->timestamp, f.timestamp) < 0) {
1210 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1211 MACSTR, MAC2STR(src_addr));
1212 return -1;
1213 }
1214
1215 os_get_time(&now);
1216 tsend = WPA_GET_LE32(f.timestamp);
1217 if ((now.sec > tsend && now.sec - tsend > 60) ||
1218 (now.sec < tsend && tsend - now.sec > 60)) {
1219 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1220 "timestamp: sender time %d own time %d\n",
1221 (int) tsend, (int) now.sec);
1222 return -1;
1223 }
1224
1225 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1226 != 0) {
1227 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1228 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1229 MAC2STR(f.r1kh_id),
1230 MAC2STR(wpa_auth->conf.r1_key_holder));
1231 return -1;
1232 }
1233
1234 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1235 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1236 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1237 f.pmk_r1, PMK_LEN);
1238 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1239 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1240
1241 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
1242 os_memset(f.pmk_r1, 0, PMK_LEN);
1243
1244 return 0;
1245 }
1246
1247
1248 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1249 const u8 *data, size_t data_len)
1250 {
1251 struct ft_rrb_frame *frame;
1252 u16 alen;
1253 const u8 *pos, *end, *start;
1254 u8 action;
1255 const u8 *sta_addr, *target_ap_addr;
1256
1257 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1258 MAC2STR(src_addr));
1259
1260 if (data_len < sizeof(*frame)) {
1261 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1262 (unsigned long) data_len);
1263 return -1;
1264 }
1265
1266 pos = data;
1267 frame = (struct ft_rrb_frame *) pos;
1268 pos += sizeof(*frame);
1269
1270 alen = le_to_host16(frame->action_length);
1271 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1272 "action_length=%d ap_address=" MACSTR,
1273 frame->frame_type, frame->packet_type, alen,
1274 MAC2STR(frame->ap_address));
1275
1276 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1277 /* Discard frame per IEEE 802.11r/D8.0, 10A.10.3 */
1278 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1279 "unrecognized type %d", frame->frame_type);
1280 return -1;
1281 }
1282
1283 if (alen > data_len - sizeof(*frame)) {
1284 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1285 "frame");
1286 return -1;
1287 }
1288
1289 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1290 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1291 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1292 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1293 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1294 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1295
1296 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1297
1298 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1299 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1300 "room for Action Frame body); alen=%lu",
1301 (unsigned long) alen);
1302 return -1;
1303 }
1304 start = pos;
1305 end = pos + alen;
1306
1307 if (*pos != WLAN_ACTION_FT) {
1308 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1309 "%d", *pos);
1310 return -1;
1311 }
1312
1313 pos++;
1314 action = *pos++;
1315 sta_addr = pos;
1316 pos += ETH_ALEN;
1317 target_ap_addr = pos;
1318 pos += ETH_ALEN;
1319 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1320 MACSTR " target_ap_addr=" MACSTR,
1321 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1322
1323 if (frame->packet_type == FT_PACKET_REQUEST) {
1324 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1325
1326 if (action != 1) {
1327 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1328 "RRB Request", action);
1329 return -1;
1330 }
1331
1332 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1333 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1334 "RRB Request does not match with own "
1335 "address");
1336 return -1;
1337 }
1338
1339 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1340 sta_addr, pos, end - pos) < 0)
1341 return -1;
1342 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1343 u16 status_code;
1344
1345 if (end - pos < 2) {
1346 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1347 "code in RRB Response");
1348 return -1;
1349 }
1350 status_code = WPA_GET_LE16(pos);
1351 pos += 2;
1352
1353 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1354 "(status_code=%d)", status_code);
1355
1356 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1357 return -1;
1358 } else {
1359 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1360 "packet_type %d", frame->packet_type);
1361 return -1;
1362 }
1363
1364 return 0;
1365 }
1366
1367
1368 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1369 struct wpa_ft_pmk_r0_sa *pmk_r0,
1370 struct ft_remote_r1kh *r1kh,
1371 const u8 *s1kh_id)
1372 {
1373 struct ft_r0kh_r1kh_push_frame frame, f;
1374 struct os_time now;
1375
1376 os_memset(&frame, 0, sizeof(frame));
1377 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1378 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1379 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1380 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1381
1382 /* aes_wrap() does not support inplace encryption, so use a temporary
1383 * buffer for the data. */
1384 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1385 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1386 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1387 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1388 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1389 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1390 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1391 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1392 WPA_PMK_NAME_LEN);
1393 os_get_time(&now);
1394 WPA_PUT_LE32(f.timestamp, now.sec);
1395 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1396 f.timestamp, frame.timestamp) < 0)
1397 return;
1398
1399 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1400 }
1401
1402
1403 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1404 {
1405 struct wpa_ft_pmk_r0_sa *r0;
1406 struct ft_remote_r1kh *r1kh;
1407
1408 if (!wpa_auth->conf.pmk_r1_push)
1409 return;
1410
1411 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1412 while (r0) {
1413 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1414 break;
1415 r0 = r0->next;
1416 }
1417
1418 if (r0 == NULL || r0->pmk_r1_pushed)
1419 return;
1420 r0->pmk_r1_pushed = 1;
1421
1422 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1423 "for STA " MACSTR, MAC2STR(addr));
1424
1425 r1kh = wpa_auth->conf.r1kh_list;
1426 while (r1kh) {
1427 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
1428 r1kh = r1kh->next;
1429 }
1430 }
1431
1432 #endif /* CONFIG_IEEE80211R */
NetBSD on the FriendlyARM MINI2440