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hostapd: Update vendor branch to 0.6.10
[dragonfly.git] / contrib / hostapd / hostapd / wpa_ft.c
blob31391051febd1be7a0f808027e1581779553af6b
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, size_t ptk_len)
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, ptk_len, ptk_name);
358 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
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 #ifdef CONFIG_IEEE80211W
375 static inline int wpa_auth_get_seqnum_igtk(struct wpa_authenticator *wpa_auth,
376 const u8 *addr, int idx, u8 *seq)
377 {
378 if (wpa_auth->cb.get_seqnum_igtk == NULL)
379 return -1;
380 return wpa_auth->cb.get_seqnum_igtk(wpa_auth->cb.ctx, addr, idx, seq);
381 }
382 #endif /* CONFIG_IEEE80211W */
383
384
385 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
386 {
387 u8 *subelem;
388 struct wpa_group *gsm = sm->group;
389 size_t subelem_len, pad_len;
390 const u8 *key;
391 size_t key_len;
392 u8 keybuf[32];
393
394 key_len = gsm->GTK_len;
395 if (key_len > sizeof(keybuf))
396 return NULL;
397
398 /*
399 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
400 * than 16 bytes.
401 */
402 pad_len = key_len % 8;
403 if (pad_len)
404 pad_len = 8 - pad_len;
405 if (key_len + pad_len < 16)
406 pad_len += 8;
407 if (pad_len) {
408 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
409 os_memset(keybuf + key_len, 0, pad_len);
410 keybuf[key_len] = 0xdd;
411 key_len += pad_len;
412 key = keybuf;
413 } else
414 key = gsm->GTK[gsm->GN - 1];
415
416 /*
417 * Sub-elem ID[1] | Length[1] | Key Info[1] | Key Length[1] | RSC[8] |
418 * Key[5..32].
419 */
420 subelem_len = 12 + key_len + 8;
421 subelem = os_zalloc(subelem_len);
422 if (subelem == NULL)
423 return NULL;
424
425 subelem[0] = FTIE_SUBELEM_GTK;
426 subelem[1] = 10 + key_len + 8;
427 subelem[2] = gsm->GN & 0x03; /* Key ID in B0-B1 of Key Info */
428 subelem[3] = gsm->GTK_len;
429 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 4);
430 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 12)) {
431 os_free(subelem);
432 return NULL;
433 }
434
435 *len = subelem_len;
436 return subelem;
437 }
438
439
440 #ifdef CONFIG_IEEE80211W
441 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
442 {
443 u8 *subelem, *pos;
444 struct wpa_group *gsm = sm->group;
445 size_t subelem_len;
446
447 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
448 * Key[16+8] */
449 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
450 subelem = os_zalloc(subelem_len);
451 if (subelem == NULL)
452 return NULL;
453
454 pos = subelem;
455 *pos++ = FTIE_SUBELEM_IGTK;
456 *pos++ = subelem_len - 2;
457 WPA_PUT_LE16(pos, gsm->GN_igtk);
458 pos += 2;
459 wpa_auth_get_seqnum_igtk(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
460 pos += 6;
461 *pos++ = WPA_IGTK_LEN;
462 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
463 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
464 os_free(subelem);
465 return NULL;
466 }
467
468 *len = subelem_len;
469 return subelem;
470 }
471 #endif /* CONFIG_IEEE80211W */
472
473
474 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
475 size_t max_len, int auth_alg)
476 {
477 u8 *end, *mdie, *ftie, *rsnie, *r0kh_id, *subelem = NULL;
478 size_t mdie_len, ftie_len, rsnie_len, r0kh_id_len, subelem_len = 0;
479 int res;
480 struct wpa_auth_config *conf;
481 struct rsn_ftie *_ftie;
482
483 if (sm == NULL)
484 return pos;
485
486 conf = &sm->wpa_auth->conf;
487
488 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
489 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
490 return pos;
491
492 end = pos + max_len;
493
494 /* RSN */
495 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
496 if (res < 0)
497 return pos;
498 rsnie = pos;
499 rsnie_len = res;
500 pos += res;
501
502 /* Mobility Domain Information */
503 res = wpa_write_mdie(conf, pos, end - pos);
504 if (res < 0)
505 return pos;
506 mdie = pos;
507 mdie_len = res;
508 pos += res;
509
510 /* Fast BSS Transition Information */
511 if (auth_alg == WLAN_AUTH_FT) {
512 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
513 r0kh_id = sm->r0kh_id;
514 r0kh_id_len = sm->r0kh_id_len;
515 #ifdef CONFIG_IEEE80211W
516 if (sm->mgmt_frame_prot) {
517 u8 *igtk;
518 size_t igtk_len;
519 u8 *nbuf;
520 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
521 if (igtk == NULL) {
522 os_free(subelem);
523 return pos;
524 }
525 nbuf = os_realloc(subelem, subelem_len + igtk_len);
526 if (nbuf == NULL) {
527 os_free(subelem);
528 os_free(igtk);
529 return pos;
530 }
531 subelem = nbuf;
532 os_memcpy(subelem + subelem_len, igtk, igtk_len);
533 subelem_len += igtk_len;
534 os_free(igtk);
535 }
536 #endif /* CONFIG_IEEE80211W */
537 } else {
538 r0kh_id = conf->r0_key_holder;
539 r0kh_id_len = conf->r0_key_holder_len;
540 }
541 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, NULL, NULL, pos,
542 end - pos, subelem, subelem_len);
543 os_free(subelem);
544 if (res < 0)
545 return pos;
546 ftie = pos;
547 ftie_len = res;
548 pos += res;
549
550 _ftie = (struct rsn_ftie *) (ftie + 2);
551 _ftie->mic_control[1] = 3; /* Information element count */
552 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
553 mdie, mdie_len, ftie, ftie_len,
554 rsnie, rsnie_len, NULL, 0, _ftie->mic) < 0)
555 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
556
557 return pos;
558 }
559
560
561 struct wpa_ft_ies {
562 const u8 *mdie;
563 size_t mdie_len;
564 const u8 *ftie;
565 size_t ftie_len;
566 const u8 *r1kh_id;
567 const u8 *gtk;
568 size_t gtk_len;
569 const u8 *r0kh_id;
570 size_t r0kh_id_len;
571 const u8 *rsn;
572 size_t rsn_len;
573 const u8 *rsn_pmkid;
574 };
575
576
577 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
578 struct wpa_ft_ies *parse)
579 {
580 const u8 *end, *pos;
581
582 parse->ftie = ie;
583 parse->ftie_len = ie_len;
584
585 pos = ie + sizeof(struct rsn_ftie);
586 end = ie + ie_len;
587
588 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
589 switch (pos[0]) {
590 case FTIE_SUBELEM_R1KH_ID:
591 if (pos[1] != FT_R1KH_ID_LEN) {
592 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
593 "length in FTIE: %d", pos[1]);
594 return -1;
595 }
596 parse->r1kh_id = pos + 2;
597 break;
598 case FTIE_SUBELEM_GTK:
599 parse->gtk = pos + 2;
600 parse->gtk_len = pos[1];
601 break;
602 case FTIE_SUBELEM_R0KH_ID:
603 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
604 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
605 "length in FTIE: %d", pos[1]);
606 return -1;
607 }
608 parse->r0kh_id = pos + 2;
609 parse->r0kh_id_len = pos[1];
610 break;
611 }
612
613 pos += 2 + pos[1];
614 }
615
616 return 0;
617 }
618
619
620 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
621 struct wpa_ft_ies *parse)
622 {
623 const u8 *end, *pos;
624 struct wpa_ie_data data;
625 int ret;
626
627 os_memset(parse, 0, sizeof(*parse));
628 if (ies == NULL)
629 return 0;
630
631 pos = ies;
632 end = ies + ies_len;
633 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
634 switch (pos[0]) {
635 case WLAN_EID_RSN:
636 parse->rsn = pos + 2;
637 parse->rsn_len = pos[1];
638 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
639 parse->rsn_len + 2,
640 &data);
641 if (ret < 0) {
642 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
643 "RSN IE: %d", ret);
644 return -1;
645 }
646 if (data.num_pmkid == 1 && data.pmkid)
647 parse->rsn_pmkid = data.pmkid;
648 break;
649 case WLAN_EID_MOBILITY_DOMAIN:
650 parse->mdie = pos + 2;
651 parse->mdie_len = pos[1];
652 break;
653 case WLAN_EID_FAST_BSS_TRANSITION:
654 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
655 return -1;
656 break;
657 }
658
659 pos += 2 + pos[1];
660 }
661
662 return 0;
663 }
664
665
666 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
667 int vlan_id,
668 const char *alg, const u8 *addr, int idx,
669 u8 *key, size_t key_len)
670 {
671 if (wpa_auth->cb.set_key == NULL)
672 return -1;
673 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
674 key, key_len);
675 }
676
677
678 static void wpa_ft_install_ptk(struct wpa_state_machine *sm)
679 {
680 char *alg;
681 int klen;
682
683 /* MLME-SETKEYS.request(PTK) */
684 if (sm->pairwise == WPA_CIPHER_TKIP) {
685 alg = "TKIP";
686 klen = 32;
687 } else if (sm->pairwise == WPA_CIPHER_CCMP) {
688 alg = "CCMP";
689 klen = 16;
690 } else
691 return;
692
693 /* FIX: add STA entry to kernel/driver here? The set_key will fail
694 * most likely without this.. At the moment, STA entry is added only
695 * after association has been completed. Alternatively, could
696 * re-configure PTK at that point(?).
697 */
698 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
699 sm->PTK.tk1, klen))
700 return;
701
702 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
703 sm->pairwise_set = TRUE;
704 }
705
706
707 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
708 const u8 *ies, size_t ies_len,
709 u8 **resp_ies, size_t *resp_ies_len)
710 {
711 struct rsn_mdie *mdie;
712 struct rsn_ftie *ftie;
713 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
714 u8 ptk_name[WPA_PMK_NAME_LEN];
715 struct wpa_auth_config *conf;
716 struct wpa_ft_ies parse;
717 size_t buflen, ptk_len;
718 int ret;
719 u8 *pos, *end;
720
721 *resp_ies = NULL;
722 *resp_ies_len = 0;
723
724 sm->pmk_r1_name_valid = 0;
725 conf = &sm->wpa_auth->conf;
726
727 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
728 ies, ies_len);
729
730 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
731 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
732 return WLAN_STATUS_UNSPECIFIED_FAILURE;
733 }
734
735 mdie = (struct rsn_mdie *) parse.mdie;
736 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
737 os_memcmp(mdie->mobility_domain,
738 sm->wpa_auth->conf.mobility_domain,
739 MOBILITY_DOMAIN_ID_LEN) != 0) {
740 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
741 return WLAN_STATUS_INVALID_MDIE;
742 }
743
744 ftie = (struct rsn_ftie *) parse.ftie;
745 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
746 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
747 return WLAN_STATUS_INVALID_FTIE;
748 }
749
750 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
751
752 if (parse.r0kh_id == NULL) {
753 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
754 return WLAN_STATUS_INVALID_FTIE;
755 }
756
757 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
758 parse.r0kh_id, parse.r0kh_id_len);
759 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
760 sm->r0kh_id_len = parse.r0kh_id_len;
761
762 if (parse.rsn_pmkid == NULL) {
763 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
764 return WLAN_STATUS_INVALID_PMKID;
765 }
766
767 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
768 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
769 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
770 sm->wpa_auth->conf.r1_key_holder, sm->addr,
771 pmk_r1_name);
772 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
773 pmk_r1_name, WPA_PMK_NAME_LEN);
774
775 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1) <
776 0) {
777 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
778 sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
779 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
780 "PMK-R1 and unknown R0KH-ID");
781 return WLAN_STATUS_INVALID_PMKID;
782 }
783
784 /*
785 * TODO: Should return "status pending" (and the caller should
786 * not send out response now). The real response will be sent
787 * once the response from R0KH is received.
788 */
789 return WLAN_STATUS_INVALID_PMKID;
790 }
791
792 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
793 sm->pmk_r1_name_valid = 1;
794 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
795
796 if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) {
797 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
798 "ANonce");
799 return WLAN_STATUS_UNSPECIFIED_FAILURE;
800 }
801
802 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
803 sm->SNonce, WPA_NONCE_LEN);
804 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
805 sm->ANonce, WPA_NONCE_LEN);
806
807 ptk_len = sm->pairwise == WPA_CIPHER_CCMP ? 48 : 64;
808 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
809 sm->wpa_auth->addr, pmk_r1_name,
810 (u8 *) &sm->PTK, ptk_len, ptk_name);
811 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
812 (u8 *) &sm->PTK, ptk_len);
813 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
814
815 wpa_ft_install_ptk(sm);
816
817 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
818 2 + FT_R1KH_ID_LEN + 200;
819 *resp_ies = os_zalloc(buflen);
820 if (*resp_ies == NULL) {
821 return WLAN_STATUS_UNSPECIFIED_FAILURE;
822 }
823
824 pos = *resp_ies;
825 end = *resp_ies + buflen;
826
827 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
828 if (ret < 0) {
829 os_free(*resp_ies);
830 *resp_ies = NULL;
831 return WLAN_STATUS_UNSPECIFIED_FAILURE;
832 }
833 pos += ret;
834
835 ret = wpa_write_mdie(conf, pos, end - pos);
836 if (ret < 0) {
837 os_free(*resp_ies);
838 *resp_ies = NULL;
839 return WLAN_STATUS_UNSPECIFIED_FAILURE;
840 }
841 pos += ret;
842
843 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
844 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
845 if (ret < 0) {
846 os_free(*resp_ies);
847 *resp_ies = NULL;
848 return WLAN_STATUS_UNSPECIFIED_FAILURE;
849 }
850 pos += ret;
851
852 *resp_ies_len = pos - *resp_ies;
853
854 return WLAN_STATUS_SUCCESS;
855 }
856
857
858 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
859 u16 auth_transaction, const u8 *ies, size_t ies_len,
860 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
861 u16 auth_transaction, u16 status,
862 const u8 *ies, size_t ies_len),
863 void *ctx)
864 {
865 u16 status;
866 u8 *resp_ies;
867 size_t resp_ies_len;
868
869 if (sm == NULL) {
870 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
871 "WPA SM not available");
872 return;
873 }
874
875 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
876 " BSSID=" MACSTR " transaction=%d",
877 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
878 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
879 &resp_ies_len);
880
881 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
882 " auth_transaction=%d status=%d",
883 MAC2STR(sm->addr), auth_transaction + 1, status);
884 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
885 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
886 resp_ies, resp_ies_len);
887 os_free(resp_ies);
888 }
889
890
891 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
892 size_t ies_len)
893 {
894 struct wpa_ft_ies parse;
895 struct rsn_mdie *mdie;
896 struct rsn_ftie *ftie;
897 u8 mic[16];
898
899 if (sm == NULL)
900 return WLAN_STATUS_UNSPECIFIED_FAILURE;
901
902 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
903
904 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
905 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
906 return WLAN_STATUS_UNSPECIFIED_FAILURE;
907 }
908
909 if (parse.rsn == NULL) {
910 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
911 return WLAN_STATUS_UNSPECIFIED_FAILURE;
912 }
913
914 if (parse.rsn_pmkid == NULL) {
915 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
916 return WLAN_STATUS_INVALID_PMKID;
917 }
918
919 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
920 {
921 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
922 "with the PMKR1Name derived from auth request");
923 return WLAN_STATUS_INVALID_PMKID;
924 }
925
926 mdie = (struct rsn_mdie *) parse.mdie;
927 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
928 os_memcmp(mdie->mobility_domain,
929 sm->wpa_auth->conf.mobility_domain,
930 MOBILITY_DOMAIN_ID_LEN) != 0) {
931 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
932 return WLAN_STATUS_INVALID_MDIE;
933 }
934
935 ftie = (struct rsn_ftie *) parse.ftie;
936 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
937 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
938 return WLAN_STATUS_INVALID_FTIE;
939 }
940
941 /*
942 * Assume that MDIE, FTIE, and RSN IE are protected and that there is
943 * no RIC, so total of 3 protected IEs.
944 */
945 if (ftie->mic_control[1] != 3) {
946 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
947 ftie->mic_control[1]);
948 return WLAN_STATUS_INVALID_FTIE;
949 }
950
951 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
952 parse.mdie - 2, parse.mdie_len + 2,
953 parse.ftie - 2, parse.ftie_len + 2,
954 parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
955 mic) < 0) {
956 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
957 return WLAN_STATUS_UNSPECIFIED_FAILURE;
958 }
959
960 if (os_memcmp(mic, ftie->mic, 16) != 0) {
961 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
962 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
963 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
964 return WLAN_STATUS_INVALID_FTIE;
965 }
966
967 return WLAN_STATUS_SUCCESS;
968 }
969
970
971 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
972 {
973 const u8 *sta_addr, *target_ap;
974 const u8 *ies;
975 size_t ies_len;
976 u8 action;
977 struct ft_rrb_frame *frame;
978
979 if (sm == NULL)
980 return -1;
981
982 /*
983 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
984 * FT Request action frame body[variable]
985 */
986
987 if (len < 14) {
988 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
989 "(len=%lu)", (unsigned long) len);
990 return -1;
991 }
992
993 action = data[1];
994 sta_addr = data + 2;
995 target_ap = data + 8;
996 ies = data + 14;
997 ies_len = len - 14;
998
999 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1000 " Target AP=" MACSTR " Action=%d)",
1001 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1002
1003 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1004 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1005 "STA=" MACSTR " STA-Address=" MACSTR,
1006 MAC2STR(sm->addr), MAC2STR(sta_addr));
1007 return -1;
1008 }
1009
1010 /*
1011 * Do some sanity checking on the target AP address (not own and not
1012 * broadcast. This could be extended to filter based on a list of known
1013 * APs in the MD (if such a list were configured).
1014 */
1015 if ((target_ap[0] & 0x01) ||
1016 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1017 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1018 "frame");
1019 return -1;
1020 }
1021
1022 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1023
1024 /* RRB - Forward action frame to the target AP */
1025 frame = os_malloc(sizeof(*frame) + len);
1026 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1027 frame->packet_type = FT_PACKET_REQUEST;
1028 frame->action_length = host_to_le16(len);
1029 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1030 os_memcpy(frame + 1, data, len);
1031
1032 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1033 sizeof(*frame) + len);
1034 os_free(frame);
1035
1036 return 0;
1037 }
1038
1039
1040 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1041 const u8 *current_ap, const u8 *sta_addr,
1042 const u8 *body, size_t len)
1043 {
1044 struct wpa_state_machine *sm;
1045 u16 status;
1046 u8 *resp_ies, *pos;
1047 size_t resp_ies_len, rlen;
1048 struct ft_rrb_frame *frame;
1049
1050 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1051 if (sm == NULL) {
1052 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1053 "RRB Request");
1054 return -1;
1055 }
1056
1057 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1058
1059 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1060 &resp_ies_len);
1061
1062 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1063 " CurrentAP=" MACSTR " status=%d",
1064 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1065 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1066
1067 /* RRB - Forward action frame response to the Current AP */
1068
1069 /*
1070 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1071 * Status_Code[2] FT Request action frame body[variable]
1072 */
1073 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1074
1075 frame = os_malloc(sizeof(*frame) + rlen);
1076 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1077 frame->packet_type = FT_PACKET_RESPONSE;
1078 frame->action_length = host_to_le16(rlen);
1079 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1080 pos = (u8 *) (frame + 1);
1081 *pos++ = WLAN_ACTION_FT;
1082 *pos++ = 2; /* Action: Response */
1083 os_memcpy(pos, sta_addr, ETH_ALEN);
1084 pos += ETH_ALEN;
1085 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1086 pos += ETH_ALEN;
1087 WPA_PUT_LE16(pos, status);
1088 pos += 2;
1089 if (resp_ies) {
1090 os_memcpy(pos, resp_ies, resp_ies_len);
1091 os_free(resp_ies);
1092 }
1093
1094 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1095 sizeof(*frame) + rlen);
1096 os_free(frame);
1097
1098 return 0;
1099 }
1100
1101
1102 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1103 const u8 *src_addr,
1104 const u8 *data, size_t data_len)
1105 {
1106 struct ft_r0kh_r1kh_pull_frame *frame, f;
1107 struct ft_remote_r1kh *r1kh;
1108 struct ft_r0kh_r1kh_resp_frame resp, r;
1109 u8 pmk_r0[PMK_LEN];
1110
1111 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1112
1113 if (data_len < sizeof(*frame))
1114 return -1;
1115
1116 r1kh = wpa_auth->conf.r1kh_list;
1117 while (r1kh) {
1118 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1119 break;
1120 r1kh = r1kh->next;
1121 }
1122 if (r1kh == NULL) {
1123 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1124 "PMK-R1 pull source address " MACSTR,
1125 MAC2STR(src_addr));
1126 return -1;
1127 }
1128
1129 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1130 /* aes_unwrap() does not support inplace decryption, so use a temporary
1131 * buffer for the data. */
1132 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1133 frame->nonce, f.nonce) < 0) {
1134 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1135 "request from " MACSTR, MAC2STR(src_addr));
1136 return -1;
1137 }
1138
1139 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1140 f.nonce, sizeof(f.nonce));
1141 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1142 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1143 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1144 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1145
1146 os_memset(&resp, 0, sizeof(resp));
1147 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1148 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1149 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1150 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1151
1152 /* aes_wrap() does not support inplace encryption, so use a temporary
1153 * buffer for the data. */
1154 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1155 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1156 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1157 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0) <
1158 0) {
1159 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1160 "PMK-R1 pull");
1161 return -1;
1162 }
1163
1164 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1165 r.pmk_r1, r.pmk_r1_name);
1166 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1167 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1168 WPA_PMK_NAME_LEN);
1169
1170 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1171 r.nonce, resp.nonce) < 0) {
1172 os_memset(pmk_r0, 0, PMK_LEN);
1173 return -1;
1174 }
1175
1176 os_memset(pmk_r0, 0, PMK_LEN);
1177
1178 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1179
1180 return 0;
1181 }
1182
1183
1184 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1185 const u8 *src_addr,
1186 const u8 *data, size_t data_len)
1187 {
1188 struct ft_r0kh_r1kh_resp_frame *frame, f;
1189 struct ft_remote_r0kh *r0kh;
1190
1191 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1192
1193 if (data_len < sizeof(*frame))
1194 return -1;
1195
1196 r0kh = wpa_auth->conf.r0kh_list;
1197 while (r0kh) {
1198 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1199 break;
1200 r0kh = r0kh->next;
1201 }
1202 if (r0kh == NULL) {
1203 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1204 "PMK-R0 pull response source address " MACSTR,
1205 MAC2STR(src_addr));
1206 return -1;
1207 }
1208
1209 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1210 /* aes_unwrap() does not support inplace decryption, so use a temporary
1211 * buffer for the data. */
1212 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1213 frame->nonce, f.nonce) < 0) {
1214 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1215 "response from " MACSTR, MAC2STR(src_addr));
1216 return -1;
1217 }
1218
1219 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1220 != 0) {
1221 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1222 "matching R1KH-ID");
1223 return -1;
1224 }
1225
1226 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1227 * and call this requests callback function to finish request
1228 * processing */
1229
1230 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1231 f.nonce, sizeof(f.nonce));
1232 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1233 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1234 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1235 f.pmk_r1, PMK_LEN);
1236 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1237 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1238
1239 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
1240 os_memset(f.pmk_r1, 0, PMK_LEN);
1241
1242 return 0;
1243 }
1244
1245
1246 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1247 const u8 *src_addr,
1248 const u8 *data, size_t data_len)
1249 {
1250 struct ft_r0kh_r1kh_push_frame *frame, f;
1251 struct ft_remote_r0kh *r0kh;
1252 struct os_time now;
1253 os_time_t tsend;
1254
1255 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1256
1257 if (data_len < sizeof(*frame))
1258 return -1;
1259
1260 r0kh = wpa_auth->conf.r0kh_list;
1261 while (r0kh) {
1262 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1263 break;
1264 r0kh = r0kh->next;
1265 }
1266 if (r0kh == NULL) {
1267 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1268 "PMK-R0 push source address " MACSTR,
1269 MAC2STR(src_addr));
1270 return -1;
1271 }
1272
1273 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1274 /* aes_unwrap() does not support inplace decryption, so use a temporary
1275 * buffer for the data. */
1276 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1277 frame->timestamp, f.timestamp) < 0) {
1278 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1279 MACSTR, MAC2STR(src_addr));
1280 return -1;
1281 }
1282
1283 os_get_time(&now);
1284 tsend = WPA_GET_LE32(f.timestamp);
1285 if ((now.sec > tsend && now.sec - tsend > 60) ||
1286 (now.sec < tsend && tsend - now.sec > 60)) {
1287 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1288 "timestamp: sender time %d own time %d\n",
1289 (int) tsend, (int) now.sec);
1290 return -1;
1291 }
1292
1293 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1294 != 0) {
1295 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1296 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1297 MAC2STR(f.r1kh_id),
1298 MAC2STR(wpa_auth->conf.r1_key_holder));
1299 return -1;
1300 }
1301
1302 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1303 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1304 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1305 f.pmk_r1, PMK_LEN);
1306 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1307 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1308
1309 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
1310 os_memset(f.pmk_r1, 0, PMK_LEN);
1311
1312 return 0;
1313 }
1314
1315
1316 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1317 const u8 *data, size_t data_len)
1318 {
1319 struct ft_rrb_frame *frame;
1320 u16 alen;
1321 const u8 *pos, *end, *start;
1322 u8 action;
1323 const u8 *sta_addr, *target_ap_addr;
1324
1325 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1326 MAC2STR(src_addr));
1327
1328 if (data_len < sizeof(*frame)) {
1329 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1330 (unsigned long) data_len);
1331 return -1;
1332 }
1333
1334 pos = data;
1335 frame = (struct ft_rrb_frame *) pos;
1336 pos += sizeof(*frame);
1337
1338 alen = le_to_host16(frame->action_length);
1339 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1340 "action_length=%d ap_address=" MACSTR,
1341 frame->frame_type, frame->packet_type, alen,
1342 MAC2STR(frame->ap_address));
1343
1344 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1345 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1346 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1347 "unrecognized type %d", frame->frame_type);
1348 return -1;
1349 }
1350
1351 if (alen > data_len - sizeof(*frame)) {
1352 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1353 "frame");
1354 return -1;
1355 }
1356
1357 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1358 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1359 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1360 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1361 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1362 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1363
1364 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1365
1366 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1367 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1368 "room for Action Frame body); alen=%lu",
1369 (unsigned long) alen);
1370 return -1;
1371 }
1372 start = pos;
1373 end = pos + alen;
1374
1375 if (*pos != WLAN_ACTION_FT) {
1376 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1377 "%d", *pos);
1378 return -1;
1379 }
1380
1381 pos++;
1382 action = *pos++;
1383 sta_addr = pos;
1384 pos += ETH_ALEN;
1385 target_ap_addr = pos;
1386 pos += ETH_ALEN;
1387 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1388 MACSTR " target_ap_addr=" MACSTR,
1389 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1390
1391 if (frame->packet_type == FT_PACKET_REQUEST) {
1392 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1393
1394 if (action != 1) {
1395 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1396 "RRB Request", action);
1397 return -1;
1398 }
1399
1400 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1401 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1402 "RRB Request does not match with own "
1403 "address");
1404 return -1;
1405 }
1406
1407 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1408 sta_addr, pos, end - pos) < 0)
1409 return -1;
1410 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1411 u16 status_code;
1412
1413 if (end - pos < 2) {
1414 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1415 "code in RRB Response");
1416 return -1;
1417 }
1418 status_code = WPA_GET_LE16(pos);
1419 pos += 2;
1420
1421 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1422 "(status_code=%d)", status_code);
1423
1424 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1425 return -1;
1426 } else {
1427 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1428 "packet_type %d", frame->packet_type);
1429 return -1;
1430 }
1431
1432 return 0;
1433 }
1434
1435
1436 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1437 struct wpa_ft_pmk_r0_sa *pmk_r0,
1438 struct ft_remote_r1kh *r1kh,
1439 const u8 *s1kh_id)
1440 {
1441 struct ft_r0kh_r1kh_push_frame frame, f;
1442 struct os_time now;
1443
1444 os_memset(&frame, 0, sizeof(frame));
1445 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1446 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1447 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1448 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1449
1450 /* aes_wrap() does not support inplace encryption, so use a temporary
1451 * buffer for the data. */
1452 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1453 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1454 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1455 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1456 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1457 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1458 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1459 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1460 WPA_PMK_NAME_LEN);
1461 os_get_time(&now);
1462 WPA_PUT_LE32(f.timestamp, now.sec);
1463 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1464 f.timestamp, frame.timestamp) < 0)
1465 return;
1466
1467 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1468 }
1469
1470
1471 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1472 {
1473 struct wpa_ft_pmk_r0_sa *r0;
1474 struct ft_remote_r1kh *r1kh;
1475
1476 if (!wpa_auth->conf.pmk_r1_push)
1477 return;
1478
1479 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1480 while (r0) {
1481 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1482 break;
1483 r0 = r0->next;
1484 }
1485
1486 if (r0 == NULL || r0->pmk_r1_pushed)
1487 return;
1488 r0->pmk_r1_pushed = 1;
1489
1490 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1491 "for STA " MACSTR, MAC2STR(addr));
1492
1493 r1kh = wpa_auth->conf.r1kh_list;
1494 while (r1kh) {
1495 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
1496 r1kh = r1kh->next;
1497 }
1498 }
1499
1500 #endif /* CONFIG_IEEE80211R */
DragonFly BSD