]> git.ipfire.org Git - thirdparty/hostap.git/blob - src/ap/wpa_auth_ft.c
projects / thirdparty / hostap.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
FILS: Add more complete support for FT-FILS use cases
[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.h"
17 #include "crypto/aes_siv.h"
18 #include "crypto/aes_wrap.h"
19 #include "crypto/random.h"
20 #include "ap_config.h"
21 #include "ieee802_11.h"
22 #include "wmm.h"
23 #include "wpa_auth.h"
24 #include "wpa_auth_i.h"
25
26
27 #ifdef CONFIG_IEEE80211R_AP
28
29 const unsigned int ftRRBseqTimeout = 10;
30 const unsigned int ftRRBmaxQueueLen = 100;
31
32
33 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
34 const u8 *current_ap, const u8 *sta_addr,
35 u16 status, const u8 *resp_ies,
36 size_t resp_ies_len);
37 static void ft_finish_pull(struct wpa_state_machine *sm);
38 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
39 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);
40
41 struct tlv_list {
42 u16 type;
43 size_t len;
44 const u8 *data;
45 };
46
47
48 /**
49 * wpa_ft_rrb_decrypt - Decrypt FT RRB message
50 * @key: AES-SIV key for AEAD
51 * @key_len: Length of key in octets
52 * @enc: Pointer to encrypted TLVs
53 * @enc_len: Length of encrypted TLVs in octets
54 * @auth: Pointer to authenticated TLVs
55 * @auth_len: Length of authenticated TLVs in octets
56 * @src_addr: MAC address of the frame sender
57 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
58 * @plain: Pointer to return the pointer to the allocated plaintext buffer;
59 * needs to be freed by the caller if not NULL;
60 * will only be returned on success
61 * @plain_len: Pointer to return the length of the allocated plaintext buffer
62 * in octets
63 * Returns: 0 on success, -1 on error
64 */
65 static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
66 const u8 *enc, const size_t enc_len,
67 const u8 *auth, const size_t auth_len,
68 const u8 *src_addr, u8 type,
69 u8 **plain, size_t *plain_size)
70 {
71 const u8 *ad[3] = { src_addr, auth, &type };
72 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
73
74 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
75
76 if (!key) { /* skip decryption */
77 *plain = os_memdup(enc, enc_len);
78 if (enc_len > 0 && !*plain)
79 goto err;
80
81 *plain_size = enc_len;
82
83 return 0;
84 }
85
86 *plain = NULL;
87
88 /* SIV overhead */
89 if (enc_len < AES_BLOCK_SIZE)
90 goto err;
91
92 *plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
93 if (!*plain)
94 goto err;
95
96 if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
97 *plain) < 0)
98 goto err;
99
100 *plain_size = enc_len - AES_BLOCK_SIZE;
101 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
102 *plain, *plain_size);
103 return 0;
104 err:
105 os_free(*plain);
106 *plain = NULL;
107 *plain_size = 0;
108
109 wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");
110
111 return -1;
112 }
113
114
115 /* get first tlv record in packet matching type
116 * @data (decrypted) packet
117 * @return 0 on success else -1
118 */
119 static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
120 u16 type, size_t *tlv_len, const u8 **tlv_data)
121 {
122 const struct ft_rrb_tlv *f;
123 size_t left;
124 le16 type16;
125 size_t len;
126
127 left = plain_len;
128 type16 = host_to_le16(type);
129
130 while (left >= sizeof(*f)) {
131 f = (const struct ft_rrb_tlv *) plain;
132
133 left -= sizeof(*f);
134 plain += sizeof(*f);
135 len = le_to_host16(f->len);
136
137 if (left < len) {
138 wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
139 break;
140 }
141
142 if (f->type == type16) {
143 *tlv_len = len;
144 *tlv_data = plain;
145 return 0;
146 }
147
148 left -= len;
149 plain += len;
150 }
151
152 return -1;
153 }
154
155
156 static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
157 {
158 const struct ft_rrb_tlv *f;
159 size_t left;
160 size_t len;
161
162 left = plain_len;
163
164 wpa_printf(MSG_DEBUG, "FT: RRB dump message");
165 while (left >= sizeof(*f)) {
166 f = (const struct ft_rrb_tlv *) plain;
167
168 left -= sizeof(*f);
169 plain += sizeof(*f);
170 len = le_to_host16(f->len);
171
172 wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
173 le_to_host16(f->type), len);
174
175 if (left < len) {
176 wpa_printf(MSG_DEBUG,
177 "FT: RRB message truncated: left %zu bytes, need %zu",
178 left, len);
179 break;
180 }
181
182 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);
183
184 left -= len;
185 plain += len;
186 }
187
188 if (left > 0)
189 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);
190
191 wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
192 }
193
194
195 static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
196 {
197 size_t tlv_len = 0;
198 int i;
199
200 if (!tlvs)
201 return 0;
202
203 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
204 tlv_len += sizeof(struct ft_rrb_tlv);
205 tlv_len += tlvs[i].len;
206 }
207
208 return tlv_len;
209 }
210
211
212 static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
213 u8 *endpos)
214 {
215 int i;
216 size_t tlv_len;
217 struct ft_rrb_tlv *hdr;
218 u8 *pos;
219
220 if (!tlvs)
221 return 0;
222
223 tlv_len = 0;
224 pos = start;
225 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
226 if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
227 return tlv_len;
228 tlv_len += sizeof(*hdr);
229 hdr = (struct ft_rrb_tlv *) pos;
230 hdr->type = host_to_le16(tlvs[i].type);
231 hdr->len = host_to_le16(tlvs[i].len);
232 pos = start + tlv_len;
233
234 if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
235 return tlv_len;
236 tlv_len += tlvs[i].len;
237 os_memcpy(pos, tlvs[i].data, tlvs[i].len);
238 pos = start + tlv_len;
239 }
240
241 return tlv_len;
242 }
243
244
245 static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
246 const struct tlv_list *tlvs2,
247 u8 **plain, size_t *plain_len)
248 {
249 u8 *pos, *endpos;
250 size_t tlv_len;
251
252 tlv_len = wpa_ft_tlv_len(tlvs1);
253 tlv_len += wpa_ft_tlv_len(tlvs2);
254
255 *plain_len = tlv_len;
256 *plain = os_zalloc(tlv_len);
257 if (!*plain) {
258 wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
259 goto err;
260 }
261
262 pos = *plain;
263 endpos = *plain + tlv_len;
264 pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
265 pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
266
267 /* sanity check */
268 if (pos != endpos) {
269 wpa_printf(MSG_ERROR, "FT: Length error building RRB");
270 goto err;
271 }
272
273 return 0;
274
275 err:
276 os_free(*plain);
277 *plain = NULL;
278 *plain_len = 0;
279 return -1;
280 }
281
282
283 static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
284 const u8 *plain, const size_t plain_len,
285 const u8 *auth, const size_t auth_len,
286 const u8 *src_addr, u8 type, u8 *enc)
287 {
288 const u8 *ad[3] = { src_addr, auth, &type };
289 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
290
291 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
292 plain, plain_len);
293 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
294
295 if (!key) {
296 /* encryption not needed, return plaintext as packet */
297 os_memcpy(enc, plain, plain_len);
298 } else if (aes_siv_encrypt(key, key_len, plain, plain_len,
299 3, ad, ad_len, enc) < 0) {
300 wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
301 return -1;
302 }
303
304 return 0;
305 }
306
307
308 /**
309 * wpa_ft_rrb_build - Build and encrypt an FT RRB message
310 * @key: AES-SIV key for AEAD
311 * @key_len: Length of key in octets
312 * @tlvs_enc0: First set of to-be-encrypted TLVs
313 * @tlvs_enc1: Second set of to-be-encrypted TLVs
314 * @tlvs_auth: Set of to-be-authenticated TLVs
315 * @src_addr: MAC address of the frame sender
316 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
317 * @packet Pointer to return the pointer to the allocated packet buffer;
318 * needs to be freed by the caller if not null;
319 * will only be returned on success
320 * @packet_len: Pointer to return the length of the allocated buffer in octets
321 * Returns: 0 on success, -1 on error
322 */
323 static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
324 const struct tlv_list *tlvs_enc0,
325 const struct tlv_list *tlvs_enc1,
326 const struct tlv_list *tlvs_auth,
327 const u8 *src_addr, u8 type,
328 u8 **packet, size_t *packet_len)
329 {
330 u8 *plain = NULL, *auth = NULL, *pos;
331 size_t plain_len = 0, auth_len = 0;
332 int ret = -1;
333
334 if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, &plain, &plain_len) < 0)
335 goto out;
336
337 if (wpa_ft_rrb_lin(tlvs_auth, NULL, &auth, &auth_len) < 0)
338 goto out;
339
340 *packet_len = sizeof(u16) + auth_len + plain_len;
341 if (key)
342 *packet_len += AES_BLOCK_SIZE;
343 *packet = os_zalloc(*packet_len);
344 if (!*packet)
345 goto out;
346
347 pos = *packet;
348 WPA_PUT_LE16(pos, auth_len);
349 pos += 2;
350 os_memcpy(pos, auth, auth_len);
351 pos += auth_len;
352 if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
353 auth_len, src_addr, type, pos) < 0)
354 goto out;
355
356 ret = 0;
357
358 out:
359 bin_clear_free(plain, plain_len);
360 os_free(auth);
361
362 if (ret) {
363 wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
364 os_free(*packet);
365 *packet = NULL;
366 *packet_len = 0;
367 }
368
369 return ret;
370 }
371
372
373 #define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
374 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
375 &f_##field##_len, &f_##field) < 0 || \
376 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
377 wpa_printf(MSG_INFO, "FT: Missing required " #field \
378 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
379 wpa_ft_rrb_dump(srcfield, srcfield##_len); \
380 goto out; \
381 } \
382 } while (0)
383
384 #define RRB_GET(type, field, txt, checklength) \
385 RRB_GET_SRC(plain, type, field, txt, checklength)
386 #define RRB_GET_AUTH(type, field, txt, checklength) \
387 RRB_GET_SRC(auth, type, field, txt, checklength)
388
389 #define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
390 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
391 &f_##field##_len, &f_##field) < 0 || \
392 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
393 wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
394 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
395 f_##field##_len = 0; \
396 f_##field = NULL; \
397 } \
398 } while (0)
399
400 #define RRB_GET_OPTIONAL(type, field, txt, checklength) \
401 RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
402 #define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
403 RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)
404
405 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
406 const u8 *data, size_t data_len)
407 {
408 if (wpa_auth->cb->send_ether == NULL)
409 return -1;
410 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
411 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
412 data, data_len);
413 }
414
415
416 static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
417 const u8 *dst, u8 oui_suffix,
418 const u8 *data, size_t data_len)
419 {
420 if (!wpa_auth->cb->send_oui)
421 return -1;
422 wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR,
423 oui_suffix, MAC2STR(dst));
424 return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data,
425 data_len);
426 }
427
428
429 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
430 const u8 *dst, const u8 *data, size_t data_len)
431 {
432 if (wpa_auth->cb->send_ft_action == NULL)
433 return -1;
434 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
435 data, data_len);
436 }
437
438
439 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
440 const u8 *addr, const u8 *p2p_dev_addr,
441 const u8 *prev_psk)
442 {
443 if (wpa_auth->cb->get_psk == NULL)
444 return NULL;
445 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
446 prev_psk, NULL);
447 }
448
449
450 static struct wpa_state_machine *
451 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
452 {
453 if (wpa_auth->cb->add_sta == NULL)
454 return NULL;
455 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
456 }
457
458
459 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
460 const u8 *sta_addr,
461 u8 *tspec_ie, size_t tspec_ielen)
462 {
463 if (wpa_auth->cb->add_tspec == NULL) {
464 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
465 return -1;
466 }
467 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
468 tspec_ielen);
469 }
470
471
472 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
473 {
474 u8 *pos = buf;
475 u8 capab;
476 if (len < 2 + sizeof(struct rsn_mdie))
477 return -1;
478
479 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
480 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
481 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
482 pos += MOBILITY_DOMAIN_ID_LEN;
483 capab = 0;
484 if (conf->ft_over_ds)
485 capab |= RSN_FT_CAPAB_FT_OVER_DS;
486 *pos++ = capab;
487
488 return pos - buf;
489 }
490
491
492 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
493 size_t r0kh_id_len,
494 const u8 *anonce, const u8 *snonce,
495 u8 *buf, size_t len, const u8 *subelem,
496 size_t subelem_len)
497 {
498 u8 *pos = buf, *ielen;
499 struct rsn_ftie *hdr;
500
501 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
502 subelem_len)
503 return -1;
504
505 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
506 ielen = pos++;
507
508 hdr = (struct rsn_ftie *) pos;
509 os_memset(hdr, 0, sizeof(*hdr));
510 pos += sizeof(*hdr);
511 WPA_PUT_LE16(hdr->mic_control, 0);
512 if (anonce)
513 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
514 if (snonce)
515 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
516
517 /* Optional Parameters */
518 *pos++ = FTIE_SUBELEM_R1KH_ID;
519 *pos++ = FT_R1KH_ID_LEN;
520 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
521 pos += FT_R1KH_ID_LEN;
522
523 if (r0kh_id) {
524 *pos++ = FTIE_SUBELEM_R0KH_ID;
525 *pos++ = r0kh_id_len;
526 os_memcpy(pos, r0kh_id, r0kh_id_len);
527 pos += r0kh_id_len;
528 }
529
530 if (subelem) {
531 os_memcpy(pos, subelem, subelem_len);
532 pos += subelem_len;
533 }
534
535 *ielen = pos - buf - 2;
536
537 return pos - buf;
538 }
539
540
541 /* A packet to be handled after seq response */
542 struct ft_remote_item {
543 struct dl_list list;
544
545 u8 nonce[FT_RRB_NONCE_LEN];
546 struct os_reltime nonce_ts;
547
548 u8 src_addr[ETH_ALEN];
549 u8 *enc;
550 size_t enc_len;
551 u8 *auth;
552 size_t auth_len;
553 int (*cb)(struct wpa_authenticator *wpa_auth,
554 const u8 *src_addr,
555 const u8 *enc, size_t enc_len,
556 const u8 *auth, size_t auth_len,
557 int no_defer);
558 };
559
560
561 static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
562 {
563 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
564 dl_list_del(&item->list);
565 bin_clear_free(item->enc, item->enc_len);
566 os_free(item->auth);
567 os_free(item);
568 }
569
570
571 static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
572 struct ft_remote_seq *rkh_seq, int cb)
573 {
574 struct ft_remote_item *item, *n;
575
576 dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
577 struct ft_remote_item, list) {
578 if (cb && item->cb)
579 item->cb(wpa_auth, item->src_addr, item->enc,
580 item->enc_len, item->auth, item->auth_len, 1);
581 wpa_ft_rrb_seq_free(item);
582 }
583 }
584
585
586 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
587 {
588 struct ft_remote_item *item = timeout_ctx;
589
590 wpa_ft_rrb_seq_free(item);
591 }
592
593
594 static int
595 wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
596 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
597 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
598 const u8 *f_r1kh_id, const u8 *key, size_t key_len,
599 const u8 *enc, size_t enc_len,
600 const u8 *auth, size_t auth_len,
601 int (*cb)(struct wpa_authenticator *wpa_auth,
602 const u8 *src_addr,
603 const u8 *enc, size_t enc_len,
604 const u8 *auth, size_t auth_len,
605 int no_defer))
606 {
607 struct ft_remote_item *item = NULL;
608 u8 *packet = NULL;
609 size_t packet_len;
610 struct tlv_list seq_req_auth[] = {
611 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
612 .data = NULL /* to be filled: item->nonce */ },
613 { .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
614 .data = f_r0kh_id },
615 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
616 .data = f_r1kh_id },
617 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
618 };
619
620 if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
621 wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
622 goto err;
623 }
624
625 item = os_zalloc(sizeof(*item));
626 if (!item)
627 goto err;
628
629 os_memcpy(item->src_addr, src_addr, ETH_ALEN);
630 item->cb = cb;
631
632 if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
633 wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
634 goto err;
635 }
636
637 if (os_get_reltime(&item->nonce_ts) < 0)
638 goto err;
639
640 if (enc && enc_len > 0) {
641 item->enc = os_memdup(enc, enc_len);
642 item->enc_len = enc_len;
643 if (!item->enc)
644 goto err;
645 }
646
647 if (auth && auth_len > 0) {
648 item->auth = os_memdup(auth, auth_len);
649 item->auth_len = auth_len;
650 if (!item->auth)
651 goto err;
652 }
653
654 eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
655 wpa_auth, item);
656
657 seq_req_auth[0].data = item->nonce;
658
659 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth,
660 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
661 &packet, &packet_len) < 0) {
662 item = NULL; /* some other seq resp might still accept this */
663 goto err;
664 }
665
666 dl_list_add(&rkh_seq->rx.queue, &item->list);
667
668 wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
669 packet, packet_len);
670
671 os_free(packet);
672
673 return 0;
674 err:
675 wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
676 if (item) {
677 os_free(item->auth);
678 bin_clear_free(item->enc, item->enc_len);
679 os_free(item);
680 }
681
682 return -1;
683 }
684
685
686 #define FT_RRB_SEQ_OK 0
687 #define FT_RRB_SEQ_DROP 1
688 #define FT_RRB_SEQ_DEFER 2
689
690 static int
691 wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
692 const u8 *enc, size_t enc_len,
693 const u8 *auth, size_t auth_len,
694 const char *msgtype, int no_defer)
695 {
696 const u8 *f_seq;
697 size_t f_seq_len;
698 const struct ft_rrb_seq *msg_both;
699 u32 msg_seq, msg_off, rkh_off;
700 struct os_reltime now;
701 unsigned int i;
702
703 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
704 wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
705 msg_both = (const struct ft_rrb_seq *) f_seq;
706
707 if (rkh_seq->rx.num_last == 0) {
708 /* first packet from remote */
709 goto defer;
710 }
711
712 if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
713 /* remote might have rebooted */
714 goto defer;
715 }
716
717 if (os_get_reltime(&now) == 0) {
718 u32 msg_ts_now_remote, msg_ts_off;
719 struct os_reltime now_remote;
720
721 os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
722 msg_ts_now_remote = now_remote.sec;
723 msg_ts_off = le_to_host32(msg_both->ts) -
724 (msg_ts_now_remote - ftRRBseqTimeout);
725 if (msg_ts_off > 2 * ftRRBseqTimeout)
726 goto defer;
727 }
728
729 msg_seq = le_to_host32(msg_both->seq);
730 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
731 msg_off = msg_seq - rkh_off;
732 if (msg_off > 0xC0000000)
733 goto out; /* too old message, drop it */
734
735 if (msg_off <= 0x40000000) {
736 for (i = 0; i < rkh_seq->rx.num_last; i++) {
737 if (rkh_seq->rx.last[i] == msg_seq)
738 goto out; /* duplicate message, drop it */
739 }
740
741 return FT_RRB_SEQ_OK;
742 }
743
744 defer:
745 if (no_defer)
746 goto out;
747
748 wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
749 MACSTR, msgtype, MAC2STR(src_addr));
750
751 return FT_RRB_SEQ_DEFER;
752 out:
753 wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
754 msgtype, MAC2STR(src_addr));
755
756 return FT_RRB_SEQ_DROP;
757 }
758
759
760 static void
761 wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
762 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
763 const u8 *auth, size_t auth_len,
764 const char *msgtype)
765 {
766 const u8 *f_seq;
767 size_t f_seq_len;
768 const struct ft_rrb_seq *msg_both;
769 u32 msg_seq, msg_off, min_off, rkh_off;
770 int minidx = 0;
771 unsigned int i;
772
773 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
774 msg_both = (const struct ft_rrb_seq *) f_seq;
775
776 msg_seq = le_to_host32(msg_both->seq);
777
778 if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
779 rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
780 rkh_seq->rx.num_last++;
781 return;
782 }
783
784 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
785 for (i = 0; i < rkh_seq->rx.num_last; i++) {
786 msg_off = rkh_seq->rx.last[i] - rkh_off;
787 min_off = rkh_seq->rx.last[minidx] - rkh_off;
788 if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
789 minidx = i;
790 }
791 rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
792 rkh_seq->rx.offsetidx = minidx;
793
794 return;
795 out:
796 /* RRB_GET_AUTH should never fail here as
797 * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
798 wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
799 }
800
801
802 static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
803 struct ft_rrb_seq *f_seq)
804 {
805 struct os_reltime now;
806
807 if (os_get_reltime(&now) < 0)
808 return -1;
809
810 if (!rkh_seq->tx.dom) {
811 if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
812 sizeof(rkh_seq->tx.seq))) {
813 wpa_printf(MSG_ERROR,
814 "FT: Failed to get random data for sequence number initialization");
815 rkh_seq->tx.seq = now.usec;
816 }
817 if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
818 sizeof(rkh_seq->tx.dom))) {
819 wpa_printf(MSG_ERROR,
820 "FT: Failed to get random data for sequence number initialization");
821 rkh_seq->tx.dom = now.usec;
822 }
823 rkh_seq->tx.dom |= 1;
824 }
825
826 f_seq->dom = host_to_le32(rkh_seq->tx.dom);
827 f_seq->seq = host_to_le32(rkh_seq->tx.seq);
828 f_seq->ts = host_to_le32(now.sec);
829
830 rkh_seq->tx.seq++;
831
832 return 0;
833 }
834
835
836 struct wpa_ft_pmk_r0_sa {
837 struct wpa_ft_pmk_r0_sa *next;
838 u8 pmk_r0[PMK_LEN];
839 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
840 u8 spa[ETH_ALEN];
841 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
842 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
843 int pmk_r1_pushed;
844 };
845
846 struct wpa_ft_pmk_r1_sa {
847 struct wpa_ft_pmk_r1_sa *next;
848 u8 pmk_r1[PMK_LEN];
849 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
850 u8 spa[ETH_ALEN];
851 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
852 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
853 };
854
855 struct wpa_ft_pmk_cache {
856 struct wpa_ft_pmk_r0_sa *pmk_r0;
857 struct wpa_ft_pmk_r1_sa *pmk_r1;
858 };
859
860 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
861 {
862 struct wpa_ft_pmk_cache *cache;
863
864 cache = os_zalloc(sizeof(*cache));
865
866 return cache;
867 }
868
869
870 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
871 {
872 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
873 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
874
875 r0 = cache->pmk_r0;
876 while (r0) {
877 r0prev = r0;
878 r0 = r0->next;
879 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
880 os_free(r0prev);
881 }
882
883 r1 = cache->pmk_r1;
884 while (r1) {
885 r1prev = r1;
886 r1 = r1->next;
887 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
888 os_free(r1prev);
889 }
890
891 os_free(cache);
892 }
893
894
895 int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
896 const u8 *spa, const u8 *pmk_r0,
897 const u8 *pmk_r0_name, int pairwise)
898 {
899 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
900 struct wpa_ft_pmk_r0_sa *r0;
901
902 /* TODO: add expiration and limit on number of entries in cache */
903
904 r0 = os_zalloc(sizeof(*r0));
905 if (r0 == NULL)
906 return -1;
907
908 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
909 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
910 os_memcpy(r0->spa, spa, ETH_ALEN);
911 r0->pairwise = pairwise;
912
913 r0->next = cache->pmk_r0;
914 cache->pmk_r0 = r0;
915
916 return 0;
917 }
918
919
920 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
921 const u8 *spa, const u8 *pmk_r0_name,
922 const struct wpa_ft_pmk_r0_sa **r0_out)
923 {
924 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
925 struct wpa_ft_pmk_r0_sa *r0;
926
927 r0 = cache->pmk_r0;
928 while (r0) {
929 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
930 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
931 WPA_PMK_NAME_LEN) == 0) {
932 *r0_out = r0;
933 return 0;
934 }
935
936 r0 = r0->next;
937 }
938
939 *r0_out = NULL;
940 return -1;
941 }
942
943
944 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
945 const u8 *spa, const u8 *pmk_r1,
946 const u8 *pmk_r1_name, int pairwise)
947 {
948 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
949 struct wpa_ft_pmk_r1_sa *r1;
950
951 /* TODO: add expiration and limit on number of entries in cache */
952
953 r1 = os_zalloc(sizeof(*r1));
954 if (r1 == NULL)
955 return -1;
956
957 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
958 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
959 os_memcpy(r1->spa, spa, ETH_ALEN);
960 r1->pairwise = pairwise;
961
962 r1->next = cache->pmk_r1;
963 cache->pmk_r1 = r1;
964
965 return 0;
966 }
967
968
969 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
970 const u8 *spa, const u8 *pmk_r1_name,
971 u8 *pmk_r1, int *pairwise)
972 {
973 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
974 struct wpa_ft_pmk_r1_sa *r1;
975
976 r1 = cache->pmk_r1;
977 while (r1) {
978 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
979 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
980 WPA_PMK_NAME_LEN) == 0) {
981 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
982 if (pairwise)
983 *pairwise = r1->pairwise;
984 return 0;
985 }
986
987 r1 = r1->next;
988 }
989
990 return -1;
991 }
992
993
994 static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
995 {
996 if (r0kh->seq)
997 return 0;
998
999 r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
1000 if (!r0kh->seq) {
1001 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
1002 return -1;
1003 }
1004
1005 dl_list_init(&r0kh->seq->rx.queue);
1006
1007 return 0;
1008 }
1009
1010
1011 static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
1012 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
1013 struct ft_remote_r0kh **r0kh_out,
1014 struct ft_remote_r0kh **r0kh_wildcard)
1015 {
1016 struct ft_remote_r0kh *r0kh;
1017
1018 *r0kh_wildcard = NULL;
1019 *r0kh_out = NULL;
1020
1021 if (wpa_auth->conf.r0kh_list)
1022 r0kh = *wpa_auth->conf.r0kh_list;
1023 else
1024 r0kh = NULL;
1025 for (; r0kh; r0kh = r0kh->next) {
1026 if (r0kh->id_len == 1 && r0kh->id[0] == '*')
1027 *r0kh_wildcard = r0kh;
1028 if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
1029 os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
1030 *r0kh_out = r0kh;
1031 }
1032
1033 if (!*r0kh_out && !*r0kh_wildcard)
1034 wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");
1035
1036 if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
1037 *r0kh_out = NULL;
1038 }
1039
1040
1041 static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
1042 {
1043 if (r1kh->seq)
1044 return 0;
1045
1046 r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
1047 if (!r1kh->seq) {
1048 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
1049 return -1;
1050 }
1051
1052 dl_list_init(&r1kh->seq->rx.queue);
1053
1054 return 0;
1055 }
1056
1057
1058 static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
1059 const u8 *f_r1kh_id,
1060 struct ft_remote_r1kh **r1kh_out,
1061 struct ft_remote_r1kh **r1kh_wildcard)
1062 {
1063 struct ft_remote_r1kh *r1kh;
1064
1065 *r1kh_wildcard = NULL;
1066 *r1kh_out = NULL;
1067
1068 if (wpa_auth->conf.r1kh_list)
1069 r1kh = *wpa_auth->conf.r1kh_list;
1070 else
1071 r1kh = NULL;
1072 for (; r1kh; r1kh = r1kh->next) {
1073 if (is_zero_ether_addr(r1kh->addr) &&
1074 is_zero_ether_addr(r1kh->id))
1075 *r1kh_wildcard = r1kh;
1076 if (f_r1kh_id &&
1077 os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
1078 *r1kh_out = r1kh;
1079 }
1080
1081 if (!*r1kh_out && !*r1kh_wildcard)
1082 wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");
1083
1084 if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
1085 *r1kh_out = NULL;
1086 }
1087
1088
1089 static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
1090 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1091 {
1092 if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
1093 os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
1094 f_r0kh_id_len) != 0)
1095 return -1;
1096
1097 return 0;
1098 }
1099
1100
1101 static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
1102 const u8 *f_r1kh_id)
1103 {
1104 if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
1105 FT_R1KH_ID_LEN) != 0)
1106 return -1;
1107
1108 return 0;
1109 }
1110
1111
1112 static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
1113 {
1114 struct wpa_authenticator *wpa_auth = eloop_ctx;
1115 struct ft_remote_r0kh *r0kh, *prev = NULL;
1116
1117 if (!wpa_auth->conf.r0kh_list)
1118 return;
1119
1120 for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
1121 if (r0kh == timeout_ctx)
1122 break;
1123 prev = r0kh;
1124 }
1125 if (!r0kh)
1126 return;
1127 if (prev)
1128 prev->next = r0kh->next;
1129 else
1130 *wpa_auth->conf.r0kh_list = r0kh->next;
1131 if (r0kh->seq)
1132 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1133 os_free(r0kh->seq);
1134 os_free(r0kh);
1135 }
1136
1137
1138 static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
1139 struct ft_remote_r0kh *r0kh, int timeout)
1140 {
1141 if (timeout > 0)
1142 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1143 wpa_auth, r0kh);
1144 }
1145
1146
1147 static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
1148 struct ft_remote_r0kh *r0kh, int timeout)
1149 {
1150 eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);
1151
1152 if (timeout > 0)
1153 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1154 wpa_auth, r0kh);
1155 }
1156
1157
1158 static struct ft_remote_r0kh *
1159 wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
1160 struct ft_remote_r0kh *r0kh_wildcard,
1161 const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
1162 int timeout)
1163 {
1164 struct ft_remote_r0kh *r0kh;
1165
1166 if (!wpa_auth->conf.r0kh_list)
1167 return NULL;
1168
1169 r0kh = os_zalloc(sizeof(*r0kh));
1170 if (!r0kh)
1171 return NULL;
1172
1173 if (src_addr)
1174 os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));
1175
1176 if (id_len > FT_R0KH_ID_MAX_LEN)
1177 id_len = FT_R0KH_ID_MAX_LEN;
1178 os_memcpy(r0kh->id, r0kh_id, id_len);
1179 r0kh->id_len = id_len;
1180
1181 os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));
1182
1183 r0kh->next = *wpa_auth->conf.r0kh_list;
1184 *wpa_auth->conf.r0kh_list = r0kh;
1185
1186 if (timeout > 0)
1187 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1188 wpa_auth, r0kh);
1189
1190 if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
1191 return NULL;
1192
1193 return r0kh;
1194 }
1195
1196
1197 static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
1198 {
1199 struct wpa_authenticator *wpa_auth = eloop_ctx;
1200 struct ft_remote_r1kh *r1kh, *prev = NULL;
1201
1202 if (!wpa_auth->conf.r1kh_list)
1203 return;
1204
1205 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
1206 if (r1kh == timeout_ctx)
1207 break;
1208 prev = r1kh;
1209 }
1210 if (!r1kh)
1211 return;
1212 if (prev)
1213 prev->next = r1kh->next;
1214 else
1215 *wpa_auth->conf.r1kh_list = r1kh->next;
1216 if (r1kh->seq)
1217 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1218 os_free(r1kh->seq);
1219 os_free(r1kh);
1220 }
1221
1222
1223 static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
1224 struct ft_remote_r1kh *r1kh, int timeout)
1225 {
1226 if (timeout > 0)
1227 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1228 wpa_auth, r1kh);
1229 }
1230
1231
1232 static struct ft_remote_r1kh *
1233 wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
1234 struct ft_remote_r1kh *r1kh_wildcard,
1235 const u8 *src_addr, const u8 *r1kh_id, int timeout)
1236 {
1237 struct ft_remote_r1kh *r1kh;
1238
1239 if (!wpa_auth->conf.r1kh_list)
1240 return NULL;
1241
1242 r1kh = os_zalloc(sizeof(*r1kh));
1243 if (!r1kh)
1244 return NULL;
1245
1246 os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
1247 os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
1248 os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
1249 r1kh->next = *wpa_auth->conf.r1kh_list;
1250 *wpa_auth->conf.r1kh_list = r1kh;
1251
1252 if (timeout > 0)
1253 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1254 wpa_auth, r1kh);
1255
1256 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
1257 return NULL;
1258
1259 return r1kh;
1260 }
1261
1262
1263 void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
1264 {
1265 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1266 }
1267
1268
1269 static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
1270 {
1271 struct ft_remote_r0kh *r0kh;
1272 struct ft_remote_r1kh *r1kh;
1273
1274 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);
1275
1276 if (wpa_auth->conf.r0kh_list)
1277 r0kh = *wpa_auth->conf.r0kh_list;
1278 else
1279 r0kh = NULL;
1280 for (; r0kh; r0kh = r0kh->next) {
1281 if (!r0kh->seq)
1282 continue;
1283 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1284 os_free(r0kh->seq);
1285 r0kh->seq = NULL;
1286 }
1287
1288 if (wpa_auth->conf.r1kh_list)
1289 r1kh = *wpa_auth->conf.r1kh_list;
1290 else
1291 r1kh = NULL;
1292 for (; r1kh; r1kh = r1kh->next) {
1293 if (!r1kh->seq)
1294 continue;
1295 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1296 os_free(r1kh->seq);
1297 r1kh->seq = NULL;
1298 }
1299 }
1300
1301
1302 static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
1303 {
1304 struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
1305 struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;
1306
1307 if (wpa_auth->conf.r0kh_list)
1308 r0kh = *wpa_auth->conf.r0kh_list;
1309 else
1310 r0kh = NULL;
1311 while (r0kh) {
1312 r0kh_next = r0kh->next;
1313 if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
1314 r0kh) > 0) {
1315 if (r0kh_prev)
1316 r0kh_prev->next = r0kh_next;
1317 else
1318 *wpa_auth->conf.r0kh_list = r0kh_next;
1319 os_free(r0kh);
1320 } else {
1321 r0kh_prev = r0kh;
1322 }
1323 r0kh = r0kh_next;
1324 }
1325
1326 if (wpa_auth->conf.r1kh_list)
1327 r1kh = *wpa_auth->conf.r1kh_list;
1328 else
1329 r1kh = NULL;
1330 while (r1kh) {
1331 r1kh_next = r1kh->next;
1332 if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
1333 r1kh) > 0) {
1334 if (r1kh_prev)
1335 r1kh_prev->next = r1kh_next;
1336 else
1337 *wpa_auth->conf.r1kh_list = r1kh_next;
1338 os_free(r1kh);
1339 } else {
1340 r1kh_prev = r1kh;
1341 }
1342 r1kh = r1kh_next;
1343 }
1344 }
1345
1346
1347 void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
1348 {
1349 wpa_ft_deinit_seq(wpa_auth);
1350 wpa_ft_deinit_rkh_tmp(wpa_auth);
1351 }
1352
1353
1354 static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
1355 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1356 {
1357 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1358
1359 if (!wpa_auth->conf.rkh_neg_timeout)
1360 return;
1361
1362 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
1363 &r0kh, &r0kh_wildcard);
1364
1365 if (!r0kh_wildcard) {
1366 /* r0kh removed after neg_timeout and might need re-adding */
1367 return;
1368 }
1369
1370 wpa_hexdump(MSG_DEBUG, "FT: Blacklist R0KH-ID",
1371 f_r0kh_id, f_r0kh_id_len);
1372
1373 if (r0kh) {
1374 wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
1375 wpa_auth->conf.rkh_neg_timeout);
1376 os_memset(r0kh->addr, 0, ETH_ALEN);
1377 } else
1378 wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
1379 f_r0kh_id_len,
1380 wpa_auth->conf.rkh_neg_timeout);
1381 }
1382
1383
1384 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
1385 {
1386 struct wpa_state_machine *sm = eloop_ctx;
1387
1388 wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
1389 MAC2STR(sm->addr));
1390 if (sm->ft_pending_pull_left_retries <= 0)
1391 wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);
1392
1393 /* cancel multiple timeouts */
1394 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1395 ft_finish_pull(sm);
1396 }
1397
1398
1399 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
1400 const u8 *ies, size_t ies_len,
1401 const u8 *pmk_r0_name)
1402 {
1403 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1404 u8 *packet = NULL;
1405 const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
1406 size_t packet_len, key_len;
1407 struct ft_rrb_seq f_seq;
1408 int tsecs, tusecs, first;
1409 struct wpabuf *ft_pending_req_ies;
1410 int r0kh_timeout;
1411 struct tlv_list req_enc[] = {
1412 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
1413 .data = pmk_r0_name },
1414 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
1415 .data = sm->addr },
1416 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1417 };
1418 struct tlv_list req_auth[] = {
1419 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
1420 .data = sm->ft_pending_pull_nonce },
1421 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
1422 .data = (u8 *) &f_seq },
1423 { .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
1424 .data = sm->r0kh_id },
1425 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
1426 .data = f_r1kh_id },
1427 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1428 };
1429
1430 if (sm->ft_pending_pull_left_retries <= 0)
1431 return -1;
1432 first = sm->ft_pending_pull_left_retries ==
1433 sm->wpa_auth->conf.rkh_pull_retries;
1434 sm->ft_pending_pull_left_retries--;
1435
1436 wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
1437 &r0kh, &r0kh_wildcard);
1438
1439 /* Keep r0kh sufficiently long in the list for seq num check */
1440 r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
1441 1 + ftRRBseqTimeout;
1442 if (r0kh) {
1443 wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
1444 } else if (r0kh_wildcard) {
1445 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
1446 /* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
1447 r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
1448 r0kh_wildcard->addr,
1449 sm->r0kh_id, sm->r0kh_id_len,
1450 r0kh_timeout);
1451 }
1452 if (r0kh == NULL) {
1453 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
1454 sm->r0kh_id, sm->r0kh_id_len);
1455 return -1;
1456 }
1457 if (is_zero_ether_addr(r0kh->addr)) {
1458 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is blacklisted",
1459 sm->r0kh_id, sm->r0kh_id_len);
1460 return -1;
1461 }
1462 if (os_memcmp(r0kh->addr, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1463 wpa_printf(MSG_DEBUG,
1464 "FT: R0KH-ID points to self - no matching key available");
1465 return -1;
1466 }
1467
1468 key = r0kh->key;
1469 key_len = sizeof(r0kh->key);
1470
1471 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
1472 "address " MACSTR, MAC2STR(r0kh->addr));
1473
1474 if (r0kh->seq->rx.num_last == 0) {
1475 /* A sequence request will be sent out anyway when pull
1476 * response is received. Send it out now to avoid one RTT. */
1477 wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
1478 r0kh->id, r0kh->id_len, f_r1kh_id, key,
1479 key_len, NULL, 0, NULL, 0, NULL);
1480 }
1481
1482 if (first &&
1483 random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
1484 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
1485 "nonce");
1486 return -1;
1487 }
1488
1489 if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
1490 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
1491 return -1;
1492 }
1493
1494 if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth,
1495 sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
1496 &packet, &packet_len) < 0)
1497 return -1;
1498
1499 ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
1500 wpabuf_free(sm->ft_pending_req_ies);
1501 sm->ft_pending_req_ies = ft_pending_req_ies;
1502 if (!sm->ft_pending_req_ies) {
1503 os_free(packet);
1504 return -1;
1505 }
1506
1507 tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
1508 tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
1509 eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);
1510
1511 wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
1512 packet, packet_len);
1513
1514 os_free(packet);
1515
1516 return 0;
1517 }
1518
1519
1520 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
1521 struct wpa_ptk *ptk)
1522 {
1523 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
1524 u8 pmk_r1[PMK_LEN];
1525 u8 ptk_name[WPA_PMK_NAME_LEN];
1526 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
1527 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
1528 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
1529 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
1530 const u8 *ssid = sm->wpa_auth->conf.ssid;
1531 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
1532 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
1533
1534 if (sm->xxkey_len == 0) {
1535 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
1536 "derivation");
1537 return -1;
1538 }
1539
1540 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
1541 r0kh, r0kh_len, sm->addr,
1542 pmk_r0, pmk_r0_name) < 0)
1543 return -1;
1544 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
1545 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
1546 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
1547 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
1548 sm->pairwise);
1549
1550 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
1551 pmk_r1, sm->pmk_r1_name) < 0)
1552 return -1;
1553 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
1554 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
1555 WPA_PMK_NAME_LEN);
1556 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
1557 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1,
1558 sm->pmk_r1_name, sm->pairwise);
1559
1560 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1561 sm->wpa_auth->addr, sm->pmk_r1_name,
1562 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
1563 }
1564
1565
1566 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
1567 const u8 *addr, int idx, u8 *seq)
1568 {
1569 if (wpa_auth->cb->get_seqnum == NULL)
1570 return -1;
1571 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
1572 }
1573
1574
1575 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
1576 {
1577 u8 *subelem;
1578 struct wpa_group *gsm = sm->group;
1579 size_t subelem_len, pad_len;
1580 const u8 *key;
1581 size_t key_len;
1582 u8 keybuf[32];
1583
1584 key_len = gsm->GTK_len;
1585 if (key_len > sizeof(keybuf))
1586 return NULL;
1587
1588 /*
1589 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
1590 * than 16 bytes.
1591 */
1592 pad_len = key_len % 8;
1593 if (pad_len)
1594 pad_len = 8 - pad_len;
1595 if (key_len + pad_len < 16)
1596 pad_len += 8;
1597 if (pad_len && key_len < sizeof(keybuf)) {
1598 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
1599 os_memset(keybuf + key_len, 0, pad_len);
1600 keybuf[key_len] = 0xdd;
1601 key_len += pad_len;
1602 key = keybuf;
1603 } else
1604 key = gsm->GTK[gsm->GN - 1];
1605
1606 /*
1607 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
1608 * Key[5..32].
1609 */
1610 subelem_len = 13 + key_len + 8;
1611 subelem = os_zalloc(subelem_len);
1612 if (subelem == NULL)
1613 return NULL;
1614
1615 subelem[0] = FTIE_SUBELEM_GTK;
1616 subelem[1] = 11 + key_len + 8;
1617 /* Key ID in B0-B1 of Key Info */
1618 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
1619 subelem[4] = gsm->GTK_len;
1620 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
1621 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key,
1622 subelem + 13)) {
1623 os_free(subelem);
1624 return NULL;
1625 }
1626
1627 *len = subelem_len;
1628 return subelem;
1629 }
1630
1631
1632 #ifdef CONFIG_IEEE80211W
1633 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
1634 {
1635 u8 *subelem, *pos;
1636 struct wpa_group *gsm = sm->group;
1637 size_t subelem_len;
1638
1639 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
1640 * Key[16+8] */
1641 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
1642 subelem = os_zalloc(subelem_len);
1643 if (subelem == NULL)
1644 return NULL;
1645
1646 pos = subelem;
1647 *pos++ = FTIE_SUBELEM_IGTK;
1648 *pos++ = subelem_len - 2;
1649 WPA_PUT_LE16(pos, gsm->GN_igtk);
1650 pos += 2;
1651 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
1652 pos += 6;
1653 *pos++ = WPA_IGTK_LEN;
1654 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8,
1655 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
1656 os_free(subelem);
1657 return NULL;
1658 }
1659
1660 *len = subelem_len;
1661 return subelem;
1662 }
1663 #endif /* CONFIG_IEEE80211W */
1664
1665
1666 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
1667 u8 *pos, u8 *end, u8 id, u8 descr_count,
1668 const u8 *ies, size_t ies_len)
1669 {
1670 struct ieee802_11_elems parse;
1671 struct rsn_rdie *rdie;
1672
1673 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
1674 id, descr_count);
1675 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
1676 ies, ies_len);
1677
1678 if (end - pos < (int) sizeof(*rdie)) {
1679 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
1680 return pos;
1681 }
1682
1683 *pos++ = WLAN_EID_RIC_DATA;
1684 *pos++ = sizeof(*rdie);
1685 rdie = (struct rsn_rdie *) pos;
1686 rdie->id = id;
1687 rdie->descr_count = 0;
1688 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
1689 pos += sizeof(*rdie);
1690
1691 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
1692 ParseFailed) {
1693 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
1694 rdie->status_code =
1695 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1696 return pos;
1697 }
1698
1699 if (parse.wmm_tspec) {
1700 struct wmm_tspec_element *tspec;
1701
1702 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
1703 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
1704 "(%d)", (int) parse.wmm_tspec_len);
1705 rdie->status_code =
1706 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1707 return pos;
1708 }
1709 if (end - pos < (int) sizeof(*tspec)) {
1710 wpa_printf(MSG_ERROR, "FT: Not enough room for "
1711 "response TSPEC");
1712 rdie->status_code =
1713 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1714 return pos;
1715 }
1716 tspec = (struct wmm_tspec_element *) pos;
1717 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
1718 }
1719
1720 #ifdef NEED_AP_MLME
1721 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
1722 int res;
1723
1724 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
1725 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
1726 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
1727 rdie->status_code =
1728 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
1729 else if (res == WMM_ADDTS_STATUS_REFUSED)
1730 rdie->status_code =
1731 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
1732 else {
1733 /* TSPEC accepted; include updated TSPEC in response */
1734 rdie->descr_count = 1;
1735 pos += sizeof(struct wmm_tspec_element);
1736 }
1737 return pos;
1738 }
1739 #endif /* NEED_AP_MLME */
1740
1741 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
1742 int res;
1743
1744 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
1745 sizeof(struct wmm_tspec_element));
1746 if (res >= 0) {
1747 if (res)
1748 rdie->status_code = host_to_le16(res);
1749 else {
1750 /* TSPEC accepted; include updated TSPEC in
1751 * response */
1752 rdie->descr_count = 1;
1753 pos += sizeof(struct wmm_tspec_element);
1754 }
1755 return pos;
1756 }
1757 }
1758
1759 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
1760 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1761 return pos;
1762 }
1763
1764
1765 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
1766 const u8 *ric, size_t ric_len)
1767 {
1768 const u8 *rpos, *start;
1769 const struct rsn_rdie *rdie;
1770
1771 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
1772
1773 rpos = ric;
1774 while (rpos + sizeof(*rdie) < ric + ric_len) {
1775 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
1776 rpos + 2 + rpos[1] > ric + ric_len)
1777 break;
1778 rdie = (const struct rsn_rdie *) (rpos + 2);
1779 rpos += 2 + rpos[1];
1780 start = rpos;
1781
1782 while (rpos + 2 <= ric + ric_len &&
1783 rpos + 2 + rpos[1] <= ric + ric_len) {
1784 if (rpos[0] == WLAN_EID_RIC_DATA)
1785 break;
1786 rpos += 2 + rpos[1];
1787 }
1788 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
1789 rdie->descr_count,
1790 start, rpos - start);
1791 }
1792
1793 return pos;
1794 }
1795
1796
1797 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
1798 size_t max_len, int auth_alg,
1799 const u8 *req_ies, size_t req_ies_len)
1800 {
1801 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
1802 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
1803 int res;
1804 struct wpa_auth_config *conf;
1805 struct rsn_ftie *_ftie;
1806 struct wpa_ft_ies parse;
1807 u8 *ric_start;
1808 u8 *anonce, *snonce;
1809 const u8 *kck;
1810 size_t kck_len;
1811
1812 if (sm == NULL)
1813 return pos;
1814
1815 conf = &sm->wpa_auth->conf;
1816
1817 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1818 return pos;
1819
1820 end = pos + max_len;
1821
1822 if (auth_alg == WLAN_AUTH_FT) {
1823 /*
1824 * RSN (only present if this is a Reassociation Response and
1825 * part of a fast BSS transition)
1826 */
1827 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
1828 if (res < 0)
1829 return pos;
1830 rsnie = pos;
1831 rsnie_len = res;
1832 pos += res;
1833 }
1834
1835 /* Mobility Domain Information */
1836 res = wpa_write_mdie(conf, pos, end - pos);
1837 if (res < 0)
1838 return pos;
1839 mdie = pos;
1840 mdie_len = res;
1841 pos += res;
1842
1843 /* Fast BSS Transition Information */
1844 if (auth_alg == WLAN_AUTH_FT) {
1845 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
1846 r0kh_id = sm->r0kh_id;
1847 r0kh_id_len = sm->r0kh_id_len;
1848 anonce = sm->ANonce;
1849 snonce = sm->SNonce;
1850 #ifdef CONFIG_IEEE80211W
1851 if (sm->mgmt_frame_prot) {
1852 u8 *igtk;
1853 size_t igtk_len;
1854 u8 *nbuf;
1855 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
1856 if (igtk == NULL) {
1857 os_free(subelem);
1858 return pos;
1859 }
1860 nbuf = os_realloc(subelem, subelem_len + igtk_len);
1861 if (nbuf == NULL) {
1862 os_free(subelem);
1863 os_free(igtk);
1864 return pos;
1865 }
1866 subelem = nbuf;
1867 os_memcpy(subelem + subelem_len, igtk, igtk_len);
1868 subelem_len += igtk_len;
1869 os_free(igtk);
1870 }
1871 #endif /* CONFIG_IEEE80211W */
1872 } else {
1873 r0kh_id = conf->r0_key_holder;
1874 r0kh_id_len = conf->r0_key_holder_len;
1875 anonce = NULL;
1876 snonce = NULL;
1877 }
1878 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
1879 end - pos, subelem, subelem_len);
1880 os_free(subelem);
1881 if (res < 0)
1882 return pos;
1883 ftie = pos;
1884 ftie_len = res;
1885 pos += res;
1886
1887 _ftie = (struct rsn_ftie *) (ftie + 2);
1888 if (auth_alg == WLAN_AUTH_FT)
1889 _ftie->mic_control[1] = 3; /* Information element count */
1890
1891 ric_start = pos;
1892 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
1893 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
1894 parse.ric_len);
1895 if (auth_alg == WLAN_AUTH_FT)
1896 _ftie->mic_control[1] +=
1897 ieee802_11_ie_count(ric_start,
1898 pos - ric_start);
1899 }
1900 if (ric_start == pos)
1901 ric_start = NULL;
1902
1903 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
1904 kck = sm->PTK.kck2;
1905 kck_len = sm->PTK.kck2_len;
1906 } else {
1907 kck = sm->PTK.kck;
1908 kck_len = sm->PTK.kck_len;
1909 }
1910 if (auth_alg == WLAN_AUTH_FT &&
1911 wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 6,
1912 mdie, mdie_len, ftie, ftie_len,
1913 rsnie, rsnie_len,
1914 ric_start, ric_start ? pos - ric_start : 0,
1915 _ftie->mic) < 0)
1916 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1917
1918 os_free(sm->assoc_resp_ftie);
1919 sm->assoc_resp_ftie = os_malloc(ftie_len);
1920 if (sm->assoc_resp_ftie)
1921 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
1922
1923 return pos;
1924 }
1925
1926
1927 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
1928 int vlan_id,
1929 enum wpa_alg alg, const u8 *addr, int idx,
1930 u8 *key, size_t key_len)
1931 {
1932 if (wpa_auth->cb->set_key == NULL)
1933 return -1;
1934 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
1935 key, key_len);
1936 }
1937
1938
1939 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
1940 {
1941 enum wpa_alg alg;
1942 int klen;
1943
1944 /* MLME-SETKEYS.request(PTK) */
1945 alg = wpa_cipher_to_alg(sm->pairwise);
1946 klen = wpa_cipher_key_len(sm->pairwise);
1947 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
1948 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
1949 "PTK configuration", sm->pairwise);
1950 return;
1951 }
1952
1953 if (sm->tk_already_set) {
1954 /* Must avoid TK reconfiguration to prevent clearing of TX/RX
1955 * PN in the driver */
1956 wpa_printf(MSG_DEBUG,
1957 "FT: Do not re-install same PTK to the driver");
1958 return;
1959 }
1960
1961 /* FIX: add STA entry to kernel/driver here? The set_key will fail
1962 * most likely without this.. At the moment, STA entry is added only
1963 * after association has been completed. This function will be called
1964 * again after association to get the PTK configured, but that could be
1965 * optimized by adding the STA entry earlier.
1966 */
1967 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
1968 sm->PTK.tk, klen))
1969 return;
1970
1971 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
1972 sm->pairwise_set = TRUE;
1973 sm->tk_already_set = TRUE;
1974 }
1975
1976
1977 /* Derive PMK-R1 from PSK, check all available PSK */
1978 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
1979 const u8 *req_pmk_r1_name,
1980 u8 *out_pmk_r1, int *out_pairwise)
1981 {
1982 const u8 *pmk = NULL;
1983 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
1984 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
1985 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1986 const u8 *mdid = wpa_auth->conf.mobility_domain;
1987 const u8 *r0kh = sm->r0kh_id;
1988 size_t r0kh_len = sm->r0kh_id_len;
1989 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
1990 const u8 *ssid = wpa_auth->conf.ssid;
1991 size_t ssid_len = wpa_auth->conf.ssid_len;
1992 int pairwise;
1993
1994 pairwise = sm->pairwise;
1995
1996 for (;;) {
1997 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
1998 pmk);
1999 if (pmk == NULL)
2000 break;
2001
2002 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
2003 r0kh_len, sm->addr,
2004 pmk_r0, pmk_r0_name) < 0 ||
2005 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
2006 pmk_r1, pmk_r1_name) < 0 ||
2007 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
2008 WPA_PMK_NAME_LEN) != 0)
2009 continue;
2010
2011 /* We found a PSK that matches the requested pmk_r1_name */
2012 wpa_printf(MSG_DEBUG,
2013 "FT: Found PSK to generate PMK-R1 locally");
2014 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
2015 if (out_pairwise)
2016 *out_pairwise = pairwise;
2017 return 0;
2018 }
2019
2020 wpa_printf(MSG_DEBUG,
2021 "FT: Did not find PSK to generate PMK-R1 locally");
2022 return -1;
2023 }
2024
2025
2026 /* Detect the configuration the station asked for.
2027 * Required to detect FT-PSK and pairwise cipher.
2028 */
2029 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
2030 struct wpa_ft_ies *parse)
2031 {
2032 int key_mgmt, ciphers;
2033
2034 if (sm->wpa_key_mgmt)
2035 return 0;
2036
2037 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
2038 if (!key_mgmt) {
2039 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
2040 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
2041 return -1;
2042 }
2043 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
2044 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
2045 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
2046 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
2047 #ifdef CONFIG_FILS
2048 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
2049 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
2050 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
2051 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
2052 #endif /* CONFIG_FILS */
2053 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
2054 if (!ciphers) {
2055 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
2056 MACSTR,
2057 parse->pairwise_cipher, MAC2STR(sm->addr));
2058 return -1;
2059 }
2060 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
2061
2062 return 0;
2063 }
2064
2065
2066 static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
2067 struct wpa_state_machine *sm,
2068 const u8 *r0kh_id, size_t r0kh_id_len,
2069 const u8 *req_pmk_r0_name,
2070 const u8 *req_pmk_r1_name,
2071 u8 *out_pmk_r1, int *out_pairwise)
2072 {
2073 struct wpa_auth_config *conf = &wpa_auth->conf;
2074 const struct wpa_ft_pmk_r0_sa *r0;
2075 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
2076
2077 if (conf->r0_key_holder_len != r0kh_id_len ||
2078 os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) !=
2079 0)
2080 return -1; /* not our R0KH-ID */
2081
2082 wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration");
2083 if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) <
2084 0)
2085 return -1; /* no matching PMKR0Name in local cache */
2086
2087 wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache");
2088
2089 if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_name, conf->r1_key_holder,
2090 sm->addr, out_pmk_r1, pmk_r1_name) < 0)
2091 return -1;
2092 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", out_pmk_r1, PMK_LEN);
2093 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
2094
2095 wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, pmk_r1_name,
2096 sm->pairwise);
2097
2098 *out_pairwise = sm->pairwise;
2099 return 0;
2100 }
2101
2102
2103 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
2104 const u8 *ies, size_t ies_len,
2105 u8 **resp_ies, size_t *resp_ies_len)
2106 {
2107 struct rsn_mdie *mdie;
2108 struct rsn_ftie *ftie;
2109 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
2110 u8 ptk_name[WPA_PMK_NAME_LEN];
2111 struct wpa_auth_config *conf;
2112 struct wpa_ft_ies parse;
2113 size_t buflen;
2114 int ret;
2115 u8 *pos, *end;
2116 int pairwise;
2117
2118 *resp_ies = NULL;
2119 *resp_ies_len = 0;
2120
2121 sm->pmk_r1_name_valid = 0;
2122 conf = &sm->wpa_auth->conf;
2123
2124 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
2125 ies, ies_len);
2126
2127 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
2128 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
2129 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2130 }
2131
2132 mdie = (struct rsn_mdie *) parse.mdie;
2133 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
2134 os_memcmp(mdie->mobility_domain,
2135 sm->wpa_auth->conf.mobility_domain,
2136 MOBILITY_DOMAIN_ID_LEN) != 0) {
2137 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
2138 return WLAN_STATUS_INVALID_MDIE;
2139 }
2140
2141 ftie = (struct rsn_ftie *) parse.ftie;
2142 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
2143 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2144 return WLAN_STATUS_INVALID_FTIE;
2145 }
2146
2147 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
2148
2149 if (parse.r0kh_id == NULL) {
2150 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
2151 return WLAN_STATUS_INVALID_FTIE;
2152 }
2153
2154 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
2155 parse.r0kh_id, parse.r0kh_id_len);
2156 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
2157 sm->r0kh_id_len = parse.r0kh_id_len;
2158
2159 if (parse.rsn_pmkid == NULL) {
2160 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
2161 return WLAN_STATUS_INVALID_PMKID;
2162 }
2163
2164 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
2165 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2166
2167 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
2168 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
2169 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
2170 sm->wpa_auth->conf.r1_key_holder, sm->addr,
2171 pmk_r1_name) < 0)
2172 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2173 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
2174 pmk_r1_name, WPA_PMK_NAME_LEN);
2175
2176 if (conf->ft_psk_generate_local &&
2177 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
2178 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0)
2179 return WLAN_STATUS_INVALID_PMKID;
2180 wpa_printf(MSG_DEBUG,
2181 "FT: Generated PMK-R1 for FT-PSK locally");
2182 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
2183 pmk_r1, &pairwise) < 0) {
2184 wpa_printf(MSG_DEBUG,
2185 "FT: No PMK-R1 available in local cache for the requested PMKR1Name");
2186 if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm,
2187 parse.r0kh_id, parse.r0kh_id_len,
2188 parse.rsn_pmkid,
2189 pmk_r1_name, pmk_r1, &pairwise)
2190 == 0) {
2191 wpa_printf(MSG_DEBUG,
2192 "FT: Generated PMK-R1 based on local PMK-R0");
2193 goto pmk_r1_derived;
2194 }
2195
2196 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
2197 wpa_printf(MSG_DEBUG,
2198 "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
2199 return WLAN_STATUS_INVALID_PMKID;
2200 }
2201
2202 return -1; /* Status pending */
2203 } else {
2204 wpa_printf(MSG_DEBUG, "FT: Found PMKR1Name from local cache");
2205 }
2206
2207 pmk_r1_derived:
2208 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
2209 sm->pmk_r1_name_valid = 1;
2210 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
2211
2212 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
2213 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
2214 "ANonce");
2215 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2216 }
2217
2218 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
2219 sm->SNonce, WPA_NONCE_LEN);
2220 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
2221 sm->ANonce, WPA_NONCE_LEN);
2222
2223 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
2224 sm->wpa_auth->addr, pmk_r1_name,
2225 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
2226 pairwise) < 0)
2227 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2228
2229 sm->pairwise = pairwise;
2230 sm->PTK_valid = TRUE;
2231 sm->tk_already_set = FALSE;
2232 wpa_ft_install_ptk(sm);
2233
2234 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
2235 2 + FT_R1KH_ID_LEN + 200;
2236 *resp_ies = os_zalloc(buflen);
2237 if (*resp_ies == NULL)
2238 goto fail;
2239
2240 pos = *resp_ies;
2241 end = *resp_ies + buflen;
2242
2243 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
2244 if (ret < 0)
2245 goto fail;
2246 pos += ret;
2247
2248 ret = wpa_write_mdie(conf, pos, end - pos);
2249 if (ret < 0)
2250 goto fail;
2251 pos += ret;
2252
2253 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
2254 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
2255 if (ret < 0)
2256 goto fail;
2257 pos += ret;
2258
2259 *resp_ies_len = pos - *resp_ies;
2260
2261 return WLAN_STATUS_SUCCESS;
2262 fail:
2263 os_free(*resp_ies);
2264 *resp_ies = NULL;
2265 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2266 }
2267
2268
2269 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
2270 u16 auth_transaction, const u8 *ies, size_t ies_len,
2271 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
2272 u16 auth_transaction, u16 status,
2273 const u8 *ies, size_t ies_len),
2274 void *ctx)
2275 {
2276 u16 status;
2277 u8 *resp_ies;
2278 size_t resp_ies_len;
2279 int res;
2280
2281 if (sm == NULL) {
2282 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
2283 "WPA SM not available");
2284 return;
2285 }
2286
2287 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
2288 " BSSID=" MACSTR " transaction=%d",
2289 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
2290 sm->ft_pending_cb = cb;
2291 sm->ft_pending_cb_ctx = ctx;
2292 sm->ft_pending_auth_transaction = auth_transaction;
2293 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
2294 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
2295 &resp_ies_len);
2296 if (res < 0) {
2297 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
2298 return;
2299 }
2300 status = res;
2301
2302 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
2303 " auth_transaction=%d status=%d",
2304 MAC2STR(sm->addr), auth_transaction + 1, status);
2305 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
2306 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
2307 resp_ies, resp_ies_len);
2308 os_free(resp_ies);
2309 }
2310
2311
2312 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
2313 size_t ies_len)
2314 {
2315 struct wpa_ft_ies parse;
2316 struct rsn_mdie *mdie;
2317 struct rsn_ftie *ftie;
2318 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
2319 size_t mic_len = 16;
2320 unsigned int count;
2321 const u8 *kck;
2322 size_t kck_len;
2323
2324 if (sm == NULL)
2325 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2326
2327 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
2328
2329 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
2330 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
2331 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2332 }
2333
2334 if (parse.rsn == NULL) {
2335 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
2336 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2337 }
2338
2339 if (parse.rsn_pmkid == NULL) {
2340 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
2341 return WLAN_STATUS_INVALID_PMKID;
2342 }
2343
2344 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
2345 != 0) {
2346 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
2347 "with the PMKR1Name derived from auth request");
2348 return WLAN_STATUS_INVALID_PMKID;
2349 }
2350
2351 mdie = (struct rsn_mdie *) parse.mdie;
2352 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
2353 os_memcmp(mdie->mobility_domain,
2354 sm->wpa_auth->conf.mobility_domain,
2355 MOBILITY_DOMAIN_ID_LEN) != 0) {
2356 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
2357 return WLAN_STATUS_INVALID_MDIE;
2358 }
2359
2360 ftie = (struct rsn_ftie *) parse.ftie;
2361 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
2362 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2363 return WLAN_STATUS_INVALID_FTIE;
2364 }
2365
2366 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
2367 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
2368 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
2369 ftie->snonce, WPA_NONCE_LEN);
2370 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
2371 sm->SNonce, WPA_NONCE_LEN);
2372 return WLAN_STATUS_INVALID_FTIE;
2373 }
2374
2375 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
2376 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
2377 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
2378 ftie->anonce, WPA_NONCE_LEN);
2379 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
2380 sm->ANonce, WPA_NONCE_LEN);
2381 return WLAN_STATUS_INVALID_FTIE;
2382 }
2383
2384
2385 if (parse.r0kh_id == NULL) {
2386 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
2387 return WLAN_STATUS_INVALID_FTIE;
2388 }
2389
2390 if (parse.r0kh_id_len != sm->r0kh_id_len ||
2391 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
2392 {
2393 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
2394 "the current R0KH-ID");
2395 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
2396 parse.r0kh_id, parse.r0kh_id_len);
2397 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
2398 sm->r0kh_id, sm->r0kh_id_len);
2399 return WLAN_STATUS_INVALID_FTIE;
2400 }
2401
2402 if (parse.r1kh_id == NULL) {
2403 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
2404 return WLAN_STATUS_INVALID_FTIE;
2405 }
2406
2407 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
2408 FT_R1KH_ID_LEN) != 0) {
2409 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
2410 "ReassocReq");
2411 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
2412 parse.r1kh_id, FT_R1KH_ID_LEN);
2413 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
2414 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
2415 return WLAN_STATUS_INVALID_FTIE;
2416 }
2417
2418 if (parse.rsn_pmkid == NULL ||
2419 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
2420 {
2421 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
2422 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
2423 return WLAN_STATUS_INVALID_PMKID;
2424 }
2425
2426 count = 3;
2427 if (parse.ric)
2428 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
2429 if (ftie->mic_control[1] != count) {
2430 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
2431 "Control: received %u expected %u",
2432 ftie->mic_control[1], count);
2433 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2434 }
2435
2436 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2437 kck = sm->PTK.kck2;
2438 kck_len = sm->PTK.kck2_len;
2439 } else {
2440 kck = sm->PTK.kck;
2441 kck_len = sm->PTK.kck_len;
2442 }
2443 if (wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 5,
2444 parse.mdie - 2, parse.mdie_len + 2,
2445 parse.ftie - 2, parse.ftie_len + 2,
2446 parse.rsn - 2, parse.rsn_len + 2,
2447 parse.ric, parse.ric_len,
2448 mic) < 0) {
2449 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
2450 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2451 }
2452
2453 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
2454 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
2455 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
2456 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
2457 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
2458 ftie->mic, mic_len);
2459 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
2460 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
2461 parse.mdie - 2, parse.mdie_len + 2);
2462 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
2463 parse.ftie - 2, parse.ftie_len + 2);
2464 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
2465 parse.rsn - 2, parse.rsn_len + 2);
2466 return WLAN_STATUS_INVALID_FTIE;
2467 }
2468
2469 return WLAN_STATUS_SUCCESS;
2470 }
2471
2472
2473 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
2474 {
2475 const u8 *sta_addr, *target_ap;
2476 const u8 *ies;
2477 size_t ies_len;
2478 u8 action;
2479 struct ft_rrb_frame *frame;
2480
2481 if (sm == NULL)
2482 return -1;
2483
2484 /*
2485 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
2486 * FT Request action frame body[variable]
2487 */
2488
2489 if (len < 14) {
2490 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
2491 "(len=%lu)", (unsigned long) len);
2492 return -1;
2493 }
2494
2495 action = data[1];
2496 sta_addr = data + 2;
2497 target_ap = data + 8;
2498 ies = data + 14;
2499 ies_len = len - 14;
2500
2501 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
2502 " Target AP=" MACSTR " Action=%d)",
2503 MAC2STR(sta_addr), MAC2STR(target_ap), action);
2504
2505 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
2506 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
2507 "STA=" MACSTR " STA-Address=" MACSTR,
2508 MAC2STR(sm->addr), MAC2STR(sta_addr));
2509 return -1;
2510 }
2511
2512 /*
2513 * Do some sanity checking on the target AP address (not own and not
2514 * broadcast. This could be extended to filter based on a list of known
2515 * APs in the MD (if such a list were configured).
2516 */
2517 if ((target_ap[0] & 0x01) ||
2518 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
2519 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
2520 "frame");
2521 return -1;
2522 }
2523
2524 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
2525
2526 if (!sm->wpa_auth->conf.ft_over_ds) {
2527 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
2528 return -1;
2529 }
2530
2531 /* RRB - Forward action frame to the target AP */
2532 frame = os_malloc(sizeof(*frame) + len);
2533 if (frame == NULL)
2534 return -1;
2535 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
2536 frame->packet_type = FT_PACKET_REQUEST;
2537 frame->action_length = host_to_le16(len);
2538 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
2539 os_memcpy(frame + 1, data, len);
2540
2541 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
2542 sizeof(*frame) + len);
2543 os_free(frame);
2544
2545 return 0;
2546 }
2547
2548
2549 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
2550 u16 auth_transaction, u16 resp,
2551 const u8 *ies, size_t ies_len)
2552 {
2553 struct wpa_state_machine *sm = ctx;
2554 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
2555 MAC2STR(sm->addr));
2556 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
2557 WLAN_STATUS_SUCCESS, ies, ies_len);
2558 }
2559
2560
2561 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
2562 const u8 *current_ap, const u8 *sta_addr,
2563 const u8 *body, size_t len)
2564 {
2565 struct wpa_state_machine *sm;
2566 u16 status;
2567 u8 *resp_ies;
2568 size_t resp_ies_len;
2569 int res;
2570
2571 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
2572 if (sm == NULL) {
2573 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
2574 "RRB Request");
2575 return -1;
2576 }
2577
2578 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
2579
2580 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
2581 sm->ft_pending_cb_ctx = sm;
2582 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
2583 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
2584 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
2585 &resp_ies_len);
2586 if (res < 0) {
2587 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
2588 return 0;
2589 }
2590 status = res;
2591
2592 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
2593 resp_ies, resp_ies_len);
2594 os_free(resp_ies);
2595 return res;
2596 }
2597
2598
2599 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
2600 const u8 *current_ap, const u8 *sta_addr,
2601 u16 status, const u8 *resp_ies,
2602 size_t resp_ies_len)
2603 {
2604 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2605 size_t rlen;
2606 struct ft_rrb_frame *frame;
2607 u8 *pos;
2608
2609 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
2610 " CurrentAP=" MACSTR " status=%d",
2611 MAC2STR(sm->addr), MAC2STR(current_ap), status);
2612 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
2613
2614 /* RRB - Forward action frame response to the Current AP */
2615
2616 /*
2617 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
2618 * Status_Code[2] FT Request action frame body[variable]
2619 */
2620 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
2621
2622 frame = os_malloc(sizeof(*frame) + rlen);
2623 if (frame == NULL)
2624 return -1;
2625 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
2626 frame->packet_type = FT_PACKET_RESPONSE;
2627 frame->action_length = host_to_le16(rlen);
2628 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
2629 pos = (u8 *) (frame + 1);
2630 *pos++ = WLAN_ACTION_FT;
2631 *pos++ = 2; /* Action: Response */
2632 os_memcpy(pos, sta_addr, ETH_ALEN);
2633 pos += ETH_ALEN;
2634 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
2635 pos += ETH_ALEN;
2636 WPA_PUT_LE16(pos, status);
2637 pos += 2;
2638 if (resp_ies)
2639 os_memcpy(pos, resp_ies, resp_ies_len);
2640
2641 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
2642 sizeof(*frame) + rlen);
2643 os_free(frame);
2644
2645 return 0;
2646 }
2647
2648
2649 static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
2650 const struct tlv_list *tlvs,
2651 const struct wpa_ft_pmk_r0_sa *pmk_r0,
2652 const u8 *r1kh_id, const u8 *s1kh_id,
2653 const struct tlv_list *tlv_auth,
2654 const u8 *src_addr, u8 type,
2655 u8 **packet, size_t *packet_len)
2656 {
2657 u8 pmk_r1[PMK_LEN];
2658 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
2659 u8 f_pairwise[sizeof(le16)];
2660 int ret;
2661 struct tlv_list sess_tlv[] = {
2662 { .type = FT_RRB_PMK_R1, .len = sizeof(pmk_r1),
2663 .data = pmk_r1 },
2664 { .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
2665 .data = pmk_r1_name },
2666 { .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
2667 .data = f_pairwise },
2668 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
2669 };
2670
2671 if (!pmk_r0)
2672 return wpa_ft_rrb_build(key, key_len, tlvs, NULL, tlv_auth,
2673 src_addr, type, packet, packet_len);
2674
2675 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh_id,
2676 s1kh_id, pmk_r1, pmk_r1_name) < 0)
2677 return -1;
2678 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
2679 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
2680 WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);
2681
2682 ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
2683 src_addr, type, packet, packet_len);
2684
2685 os_memset(pmk_r1, 0, sizeof(pmk_r1));
2686
2687 return ret;
2688 }
2689
2690
2691 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
2692 const u8 *src_addr,
2693 const u8 *enc, size_t enc_len,
2694 const u8 *auth, size_t auth_len,
2695 int no_defer)
2696 {
2697 const char *msgtype = "pull request";
2698 u8 *plain = NULL, *packet = NULL;
2699 size_t plain_len = 0, packet_len = 0;
2700 struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
2701 const u8 *key;
2702 size_t key_len;
2703 int seq_ret;
2704 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
2705 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
2706 size_t f_pmk_r0_name_len;
2707 const struct wpa_ft_pmk_r0_sa *r0;
2708 int ret;
2709 struct tlv_list resp[2];
2710 struct tlv_list resp_auth[5];
2711 struct ft_rrb_seq f_seq;
2712
2713 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
2714
2715 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
2716 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
2717
2718 if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
2719 wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
2720 goto out;
2721 }
2722
2723 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
2724 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
2725
2726 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
2727 if (r1kh) {
2728 key = r1kh->key;
2729 key_len = sizeof(r1kh->key);
2730 } else if (r1kh_wildcard) {
2731 wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
2732 key = r1kh_wildcard->key;
2733 key_len = sizeof(r1kh_wildcard->key);
2734 } else {
2735 goto out;
2736 }
2737
2738 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
2739 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
2740
2741 seq_ret = FT_RRB_SEQ_DROP;
2742 if (r1kh)
2743 seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
2744 auth, auth_len, msgtype, no_defer);
2745 if (!no_defer && r1kh_wildcard &&
2746 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
2747 /* wildcard: r1kh-id unknown or changed addr -> do a seq req */
2748 seq_ret = FT_RRB_SEQ_DEFER;
2749 }
2750
2751 if (seq_ret == FT_RRB_SEQ_DROP)
2752 goto out;
2753
2754 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
2755 src_addr, FT_PACKET_R0KH_R1KH_PULL,
2756 &plain, &plain_len) < 0)
2757 goto out;
2758
2759 if (!r1kh)
2760 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
2761 f_r1kh_id,
2762 wpa_auth->conf.rkh_pos_timeout);
2763 if (!r1kh)
2764 goto out;
2765
2766 if (seq_ret == FT_RRB_SEQ_DEFER) {
2767 wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
2768 f_r0kh_id_len, f_r1kh_id, key, key_len,
2769 enc, enc_len, auth, auth_len,
2770 &wpa_ft_rrb_rx_pull);
2771 goto out;
2772 }
2773
2774 wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
2775 msgtype);
2776 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
2777 wpa_auth->conf.rkh_pos_timeout);
2778
2779 RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
2780 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
2781 f_pmk_r0_name_len);
2782
2783 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
2784 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
2785
2786 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
2787 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
2788 goto out;
2789 }
2790
2791 resp[0].type = FT_RRB_S1KH_ID;
2792 resp[0].len = f_s1kh_id_len;
2793 resp[0].data = f_s1kh_id;
2794 resp[1].type = FT_RRB_LAST_EMPTY;
2795 resp[1].len = 0;
2796 resp[1].data = NULL;
2797
2798 resp_auth[0].type = FT_RRB_NONCE;
2799 resp_auth[0].len = f_nonce_len;
2800 resp_auth[0].data = f_nonce;
2801 resp_auth[1].type = FT_RRB_SEQ;
2802 resp_auth[1].len = sizeof(f_seq);
2803 resp_auth[1].data = (u8 *) &f_seq;
2804 resp_auth[2].type = FT_RRB_R0KH_ID;
2805 resp_auth[2].len = f_r0kh_id_len;
2806 resp_auth[2].data = f_r0kh_id;
2807 resp_auth[3].type = FT_RRB_R1KH_ID;
2808 resp_auth[3].len = f_r1kh_id_len;
2809 resp_auth[3].data = f_r1kh_id;
2810 resp_auth[4].type = FT_RRB_LAST_EMPTY;
2811 resp_auth[4].len = 0;
2812 resp_auth[4].data = NULL;
2813
2814 if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0)
2815 wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
2816
2817 ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id, f_s1kh_id,
2818 resp_auth, wpa_auth->addr,
2819 FT_PACKET_R0KH_R1KH_RESP,
2820 &packet, &packet_len);
2821
2822 if (!ret)
2823 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
2824 FT_PACKET_R0KH_R1KH_RESP, packet,
2825 packet_len);
2826
2827 out:
2828 os_free(plain);
2829 os_free(packet);
2830
2831 return 0;
2832 }
2833
2834
2835 /* @returns 0 on success
2836 * -1 on error
2837 * -2 if FR_RRB_PAIRWISE is missing
2838 */
2839 static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
2840 const u8 *src_addr, u8 type,
2841 const u8 *enc, size_t enc_len,
2842 const u8 *auth, size_t auth_len,
2843 const char *msgtype, u8 *s1kh_id_out,
2844 int (*cb)(struct wpa_authenticator *wpa_auth,
2845 const u8 *src_addr,
2846 const u8 *enc, size_t enc_len,
2847 const u8 *auth, size_t auth_len,
2848 int no_defer))
2849 {
2850 u8 *plain = NULL;
2851 size_t plain_len = 0;
2852 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
2853 const u8 *key;
2854 size_t key_len;
2855 int seq_ret;
2856 const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
2857 const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
2858 size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
2859 size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
2860 int pairwise;
2861 int ret = -1;
2862
2863 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
2864 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
2865
2866 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
2867 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
2868
2869 if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
2870 wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
2871 goto out;
2872 }
2873
2874 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
2875 &r0kh_wildcard);
2876 if (r0kh) {
2877 key = r0kh->key;
2878 key_len = sizeof(r0kh->key);
2879 } else if (r0kh_wildcard) {
2880 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
2881 key = r0kh_wildcard->key;
2882 key_len = sizeof(r0kh_wildcard->key);
2883 } else {
2884 goto out;
2885 }
2886
2887 seq_ret = FT_RRB_SEQ_DROP;
2888 if (r0kh) {
2889 seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
2890 auth, auth_len, msgtype,
2891 cb ? 0 : 1);
2892 }
2893 if (cb && r0kh_wildcard &&
2894 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
2895 /* wildcard: r0kh-id unknown or changed addr -> do a seq req */
2896 seq_ret = FT_RRB_SEQ_DEFER;
2897 }
2898
2899 if (seq_ret == FT_RRB_SEQ_DROP)
2900 goto out;
2901
2902 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
2903 src_addr, type, &plain, &plain_len) < 0)
2904 goto out;
2905
2906 if (!r0kh)
2907 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
2908 f_r0kh_id, f_r0kh_id_len,
2909 wpa_auth->conf.rkh_pos_timeout);
2910 if (!r0kh)
2911 goto out;
2912
2913 if (seq_ret == FT_RRB_SEQ_DEFER) {
2914 wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
2915 f_r0kh_id_len, f_r1kh_id, key, key_len,
2916 enc, enc_len, auth, auth_len, cb);
2917 goto out;
2918 }
2919
2920 wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
2921 msgtype);
2922 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
2923 wpa_auth->conf.rkh_pos_timeout);
2924
2925 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
2926 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
2927
2928 if (s1kh_id_out)
2929 os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);
2930
2931 ret = -2;
2932 RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
2933 wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);
2934
2935 ret = -1;
2936 RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
2937 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
2938 f_pmk_r1_name, WPA_PMK_NAME_LEN);
2939
2940 RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, PMK_LEN);
2941 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, PMK_LEN);
2942
2943 pairwise = WPA_GET_LE16(f_pairwise);
2944
2945 if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, f_pmk_r1_name,
2946 pairwise) < 0)
2947 goto out;
2948
2949 ret = 0;
2950 out:
2951 if (plain) {
2952 os_memset(plain, 0, plain_len);
2953 os_free(plain);
2954 }
2955
2956 return ret;
2957
2958 }
2959
2960
2961 static void ft_finish_pull(struct wpa_state_machine *sm)
2962 {
2963 int res;
2964 u8 *resp_ies;
2965 size_t resp_ies_len;
2966 u16 status;
2967
2968 if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
2969 return;
2970
2971 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
2972 wpabuf_len(sm->ft_pending_req_ies),
2973 &resp_ies, &resp_ies_len);
2974 if (res < 0) {
2975 /* this loop is broken by ft_pending_pull_left_retries */
2976 wpa_printf(MSG_DEBUG,
2977 "FT: Callback postponed until response is available");
2978 return;
2979 }
2980 wpabuf_free(sm->ft_pending_req_ies);
2981 sm->ft_pending_req_ies = NULL;
2982 status = res;
2983 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
2984 " - status %u", MAC2STR(sm->addr), status);
2985
2986 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
2987 sm->ft_pending_auth_transaction + 1, status,
2988 resp_ies, resp_ies_len);
2989 os_free(resp_ies);
2990 }
2991
2992
2993 struct ft_get_sta_ctx {
2994 const u8 *nonce;
2995 const u8 *s1kh_id;
2996 struct wpa_state_machine *sm;
2997 };
2998
2999
3000 static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
3001 {
3002 struct ft_get_sta_ctx *info = ctx;
3003
3004 if ((info->s1kh_id &&
3005 os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) ||
3006 os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
3007 FT_RRB_NONCE_LEN) != 0 ||
3008 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
3009 return 0;
3010
3011 info->sm = sm;
3012
3013 return 1;
3014 }
3015
3016
3017 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
3018 const u8 *src_addr,
3019 const u8 *enc, size_t enc_len,
3020 const u8 *auth, size_t auth_len,
3021 int no_defer)
3022 {
3023 const char *msgtype = "pull response";
3024 int nak, ret = -1;
3025 struct ft_get_sta_ctx ctx;
3026 u8 s1kh_id[ETH_ALEN];
3027 const u8 *f_nonce;
3028 size_t f_nonce_len;
3029
3030 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
3031
3032 RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
3033 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
3034
3035 os_memset(&ctx, 0, sizeof(ctx));
3036 ctx.nonce = f_nonce;
3037 if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
3038 /* nonce not found */
3039 wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
3040 return -1;
3041 }
3042
3043 ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
3044 enc, enc_len, auth, auth_len, msgtype, s1kh_id,
3045 no_defer ? NULL : &wpa_ft_rrb_rx_resp);
3046 if (ret == -2) {
3047 ret = 0;
3048 nak = 1;
3049 } else {
3050 nak = 0;
3051 }
3052 if (ret < 0)
3053 return -1;
3054
3055 ctx.s1kh_id = s1kh_id;
3056 if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
3057 wpa_printf(MSG_DEBUG,
3058 "FT: Response to a pending pull request for " MACSTR,
3059 MAC2STR(ctx.sm->addr));
3060 eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
3061 if (nak)
3062 ctx.sm->ft_pending_pull_left_retries = 0;
3063 ft_finish_pull(ctx.sm);
3064 }
3065
3066 out:
3067 return ret;
3068 }
3069
3070
3071 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
3072 const u8 *src_addr,
3073 const u8 *enc, size_t enc_len,
3074 const u8 *auth, size_t auth_len, int no_defer)
3075 {
3076 const char *msgtype = "push";
3077
3078 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
3079
3080 if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
3081 enc, enc_len, auth, auth_len, msgtype, NULL,
3082 no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
3083 return -1;
3084
3085 return 0;
3086 }
3087
3088
3089 static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
3090 const u8 *src_addr, int type,
3091 const u8 *enc, size_t enc_len,
3092 const u8 *auth, size_t auth_len,
3093 struct ft_remote_seq **rkh_seq,
3094 u8 **key, size_t *key_len,
3095 struct ft_remote_r0kh **r0kh_out,
3096 struct ft_remote_r1kh **r1kh_out,
3097 struct ft_remote_r0kh **r0kh_wildcard_out,
3098 struct ft_remote_r1kh **r1kh_wildcard_out)
3099 {
3100 struct ft_remote_r0kh *r0kh = NULL;
3101 struct ft_remote_r1kh *r1kh = NULL;
3102 const u8 *f_r0kh_id, *f_r1kh_id;
3103 size_t f_r0kh_id_len, f_r1kh_id_len;
3104 int to_r0kh, to_r1kh;
3105 u8 *plain = NULL;
3106 size_t plain_len = 0;
3107 struct ft_remote_r0kh *r0kh_wildcard;
3108 struct ft_remote_r1kh *r1kh_wildcard;
3109
3110 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
3111 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
3112
3113 to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
3114 to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);
3115
3116 if (to_r0kh && to_r1kh) {
3117 wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
3118 goto out;
3119 }
3120
3121 if (!to_r0kh && !to_r1kh) {
3122 wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
3123 goto out;
3124 }
3125
3126 if (!to_r0kh) {
3127 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
3128 &r0kh, &r0kh_wildcard);
3129 if (!r0kh_wildcard &&
3130 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
3131 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
3132 f_r0kh_id, f_r0kh_id_len);
3133 goto out;
3134 }
3135 if (r0kh) {
3136 *key = r0kh->key;
3137 *key_len = sizeof(r0kh->key);
3138 } else {
3139 *key = r0kh_wildcard->key;
3140 *key_len = sizeof(r0kh_wildcard->key);
3141 }
3142 }
3143
3144 if (!to_r1kh) {
3145 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
3146 &r1kh_wildcard);
3147 if (!r1kh_wildcard &&
3148 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
3149 wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
3150 f_r1kh_id, FT_R1KH_ID_LEN);
3151 goto out;
3152 }
3153 if (r1kh) {
3154 *key = r1kh->key;
3155 *key_len = sizeof(r1kh->key);
3156 } else {
3157 *key = r1kh_wildcard->key;
3158 *key_len = sizeof(r1kh_wildcard->key);
3159 }
3160 }
3161
3162 if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
3163 src_addr, type, &plain, &plain_len) < 0)
3164 goto out;
3165
3166 os_free(plain);
3167
3168 if (!to_r0kh) {
3169 if (!r0kh)
3170 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
3171 src_addr, f_r0kh_id,
3172 f_r0kh_id_len,
3173 ftRRBseqTimeout);
3174 if (!r0kh)
3175 goto out;
3176
3177 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
3178 *rkh_seq = r0kh->seq;
3179 if (r0kh_out)
3180 *r0kh_out = r0kh;
3181 if (r0kh_wildcard_out)
3182 *r0kh_wildcard_out = r0kh_wildcard;
3183 }
3184
3185 if (!to_r1kh) {
3186 if (!r1kh)
3187 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
3188 src_addr, f_r1kh_id,
3189 ftRRBseqTimeout);
3190 if (!r1kh)
3191 goto out;
3192
3193 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
3194 *rkh_seq = r1kh->seq;
3195 if (r1kh_out)
3196 *r1kh_out = r1kh;
3197 if (r1kh_wildcard_out)
3198 *r1kh_wildcard_out = r1kh_wildcard;
3199 }
3200
3201 return 0;
3202 out:
3203 return -1;
3204 }
3205
3206
3207 static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
3208 const u8 *src_addr,
3209 const u8 *enc, size_t enc_len,
3210 const u8 *auth, size_t auth_len,
3211 int no_defer)
3212 {
3213 int ret = -1;
3214 struct ft_rrb_seq f_seq;
3215 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
3216 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
3217 struct ft_remote_seq *rkh_seq = NULL;
3218 u8 *packet = NULL, *key = NULL;
3219 size_t packet_len = 0, key_len = 0;
3220 struct tlv_list seq_resp_auth[5];
3221
3222 wpa_printf(MSG_DEBUG, "FT: Received sequence number request");
3223
3224 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
3225 enc, enc_len, auth, auth_len, &rkh_seq, &key,
3226 &key_len, NULL, NULL, NULL, NULL) < 0)
3227 goto out;
3228
3229 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
3230 wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);
3231
3232 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
3233 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
3234
3235 if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
3236 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3237 goto out;
3238 }
3239
3240 seq_resp_auth[0].type = FT_RRB_NONCE;
3241 seq_resp_auth[0].len = f_nonce_len;
3242 seq_resp_auth[0].data = f_nonce;
3243 seq_resp_auth[1].type = FT_RRB_SEQ;
3244 seq_resp_auth[1].len = sizeof(f_seq);
3245 seq_resp_auth[1].data = (u8 *) &f_seq;
3246 seq_resp_auth[2].type = FT_RRB_R0KH_ID;
3247 seq_resp_auth[2].len = f_r0kh_id_len;
3248 seq_resp_auth[2].data = f_r0kh_id;
3249 seq_resp_auth[3].type = FT_RRB_R1KH_ID;
3250 seq_resp_auth[3].len = FT_R1KH_ID_LEN;
3251 seq_resp_auth[3].data = f_r1kh_id;
3252 seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
3253 seq_resp_auth[4].len = 0;
3254 seq_resp_auth[4].data = NULL;
3255
3256 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth,
3257 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
3258 &packet, &packet_len) < 0)
3259 goto out;
3260
3261 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
3262 FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
3263 packet_len);
3264
3265 out:
3266 os_free(packet);
3267
3268 return ret;
3269 }
3270
3271
3272 static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
3273 const u8 *src_addr,
3274 const u8 *enc, size_t enc_len,
3275 const u8 *auth, size_t auth_len,
3276 int no_defer)
3277 {
3278 u8 *key = NULL;
3279 size_t key_len = 0;
3280 struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
3281 struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
3282 const u8 *f_nonce, *f_seq;
3283 size_t f_nonce_len, f_seq_len;
3284 struct ft_remote_seq *rkh_seq = NULL;
3285 struct ft_remote_item *item;
3286 struct os_reltime now, now_remote;
3287 int seq_ret, found;
3288 const struct ft_rrb_seq *msg_both;
3289 u32 msg_dom, msg_seq;
3290
3291 wpa_printf(MSG_DEBUG, "FT: Received sequence number response");
3292
3293 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
3294 enc, enc_len, auth, auth_len, &rkh_seq, &key,
3295 &key_len, &r0kh, &r1kh, &r0kh_wildcard,
3296 &r1kh_wildcard) < 0)
3297 goto out;
3298
3299 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
3300 wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
3301 f_nonce_len);
3302
3303 found = 0;
3304 dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
3305 list) {
3306 if (os_memcmp_const(f_nonce, item->nonce,
3307 FT_RRB_NONCE_LEN) != 0 ||
3308 os_get_reltime(&now) < 0 ||
3309 os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
3310 continue;
3311
3312 found = 1;
3313 break;
3314 }
3315 if (!found) {
3316 wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
3317 goto out;
3318 }
3319
3320 if (r0kh) {
3321 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
3322 wpa_auth->conf.rkh_pos_timeout);
3323 if (r0kh_wildcard)
3324 os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
3325 }
3326
3327 if (r1kh) {
3328 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
3329 wpa_auth->conf.rkh_pos_timeout);
3330 if (r1kh_wildcard)
3331 os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
3332 }
3333
3334 seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
3335 auth_len, "seq response", 1);
3336 if (seq_ret == FT_RRB_SEQ_OK) {
3337 wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
3338 wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
3339 auth_len, "seq response");
3340 } else {
3341 wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");
3342
3343 RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
3344 sizeof(*msg_both));
3345 msg_both = (const struct ft_rrb_seq *) f_seq;
3346
3347 msg_dom = le_to_host32(msg_both->dom);
3348 msg_seq = le_to_host32(msg_both->seq);
3349 now_remote.sec = le_to_host32(msg_both->ts);
3350 now_remote.usec = 0;
3351
3352 rkh_seq->rx.num_last = 2;
3353 rkh_seq->rx.dom = msg_dom;
3354 rkh_seq->rx.offsetidx = 0;
3355 /* Accept some older, possibly cached packets as well */
3356 rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
3357 dl_list_len(&rkh_seq->rx.queue);
3358 rkh_seq->rx.last[1] = msg_seq;
3359
3360 /* local time - offset = remote time
3361 * <=> local time - remote time = offset */
3362 os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
3363 }
3364
3365 wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);
3366
3367 return 0;
3368 out:
3369 return -1;
3370 }
3371
3372
3373 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
3374 const u8 *data, size_t data_len)
3375 {
3376 struct ft_rrb_frame *frame;
3377 u16 alen;
3378 const u8 *pos, *end, *start;
3379 u8 action;
3380 const u8 *sta_addr, *target_ap_addr;
3381
3382 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
3383 MAC2STR(src_addr));
3384
3385 if (data_len < sizeof(*frame)) {
3386 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
3387 (unsigned long) data_len);
3388 return -1;
3389 }
3390
3391 pos = data;
3392 frame = (struct ft_rrb_frame *) pos;
3393 pos += sizeof(*frame);
3394
3395 alen = le_to_host16(frame->action_length);
3396 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
3397 "action_length=%d ap_address=" MACSTR,
3398 frame->frame_type, frame->packet_type, alen,
3399 MAC2STR(frame->ap_address));
3400
3401 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
3402 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
3403 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
3404 "unrecognized type %d", frame->frame_type);
3405 return -1;
3406 }
3407
3408 if (alen > data_len - sizeof(*frame)) {
3409 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
3410 "frame");
3411 return -1;
3412 }
3413
3414 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
3415
3416 if (alen < 1 + 1 + 2 * ETH_ALEN) {
3417 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
3418 "room for Action Frame body); alen=%lu",
3419 (unsigned long) alen);
3420 return -1;
3421 }
3422 start = pos;
3423 end = pos + alen;
3424
3425 if (*pos != WLAN_ACTION_FT) {
3426 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
3427 "%d", *pos);
3428 return -1;
3429 }
3430
3431 pos++;
3432 action = *pos++;
3433 sta_addr = pos;
3434 pos += ETH_ALEN;
3435 target_ap_addr = pos;
3436 pos += ETH_ALEN;
3437 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
3438 MACSTR " target_ap_addr=" MACSTR,
3439 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
3440
3441 if (frame->packet_type == FT_PACKET_REQUEST) {
3442 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
3443
3444 if (action != 1) {
3445 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
3446 "RRB Request", action);
3447 return -1;
3448 }
3449
3450 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
3451 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
3452 "RRB Request does not match with own "
3453 "address");
3454 return -1;
3455 }
3456
3457 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
3458 sta_addr, pos, end - pos) < 0)
3459 return -1;
3460 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
3461 u16 status_code;
3462
3463 if (end - pos < 2) {
3464 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
3465 "code in RRB Response");
3466 return -1;
3467 }
3468 status_code = WPA_GET_LE16(pos);
3469 pos += 2;
3470
3471 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
3472 "(status_code=%d)", status_code);
3473
3474 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
3475 return -1;
3476 } else {
3477 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
3478 "packet_type %d", frame->packet_type);
3479 return -1;
3480 }
3481
3482 if (end > pos) {
3483 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
3484 pos, end - pos);
3485 }
3486
3487 return 0;
3488 }
3489
3490
3491 void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
3492 const u8 *dst_addr, u8 oui_suffix, const u8 *data,
3493 size_t data_len)
3494 {
3495 const u8 *auth, *enc;
3496 size_t alen, elen;
3497 int no_defer = 0;
3498
3499 wpa_printf(MSG_DEBUG, "FT: RRB-OUI received frame from remote AP "
3500 MACSTR, MAC2STR(src_addr));
3501 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame - oui_suffix=%d", oui_suffix);
3502
3503 if (is_multicast_ether_addr(src_addr)) {
3504 wpa_printf(MSG_DEBUG,
3505 "FT: RRB-OUI received frame from multicast address "
3506 MACSTR, MAC2STR(src_addr));
3507 return;
3508 }
3509
3510 if (is_multicast_ether_addr(dst_addr)) {
3511 wpa_printf(MSG_DEBUG,
3512 "FT: RRB-OUI received frame from remote AP " MACSTR
3513 " to multicast address " MACSTR,
3514 MAC2STR(src_addr), MAC2STR(dst_addr));
3515 no_defer = 1;
3516 }
3517
3518 if (data_len < sizeof(u16)) {
3519 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
3520 return;
3521 }
3522
3523 alen = WPA_GET_LE16(data);
3524 if (data_len < sizeof(u16) + alen) {
3525 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
3526 return;
3527 }
3528
3529 auth = data + sizeof(u16);
3530 enc = data + sizeof(u16) + alen;
3531 elen = data_len - sizeof(u16) - alen;
3532
3533 switch (oui_suffix) {
3534 case FT_PACKET_R0KH_R1KH_PULL:
3535 wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
3536 no_defer);
3537 break;
3538 case FT_PACKET_R0KH_R1KH_RESP:
3539 wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
3540 no_defer);
3541 break;
3542 case FT_PACKET_R0KH_R1KH_PUSH:
3543 wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
3544 no_defer);
3545 break;
3546 case FT_PACKET_R0KH_R1KH_SEQ_REQ:
3547 wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
3548 no_defer);
3549 break;
3550 case FT_PACKET_R0KH_R1KH_SEQ_RESP:
3551 wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
3552 alen, no_defer);
3553 break;
3554 }
3555 }
3556
3557
3558 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
3559 struct wpa_ft_pmk_r0_sa *pmk_r0,
3560 struct ft_remote_r1kh *r1kh,
3561 const u8 *s1kh_id)
3562 {
3563 u8 *packet;
3564 size_t packet_len;
3565 struct ft_rrb_seq f_seq;
3566 struct tlv_list push[] = {
3567 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
3568 .data = s1kh_id },
3569 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
3570 .data = pmk_r0->pmk_r0_name },
3571 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3572 };
3573 struct tlv_list push_auth[] = {
3574 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
3575 .data = (u8 *) &f_seq },
3576 { .type = FT_RRB_R0KH_ID,
3577 .len = wpa_auth->conf.r0_key_holder_len,
3578 .data = wpa_auth->conf.r0_key_holder },
3579 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
3580 .data = r1kh->id },
3581 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3582 };
3583
3584 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
3585 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3586 return -1;
3587 }
3588
3589 if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
3590 r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
3591 FT_PACKET_R0KH_R1KH_PUSH,
3592 &packet, &packet_len) < 0)
3593 return -1;
3594
3595 wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
3596 packet, packet_len);
3597
3598 os_free(packet);
3599 return 0;
3600 }
3601
3602
3603 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
3604 {
3605 struct wpa_ft_pmk_r0_sa *r0;
3606 struct ft_remote_r1kh *r1kh;
3607
3608 if (!wpa_auth->conf.pmk_r1_push)
3609 return;
3610 if (!wpa_auth->conf.r1kh_list)
3611 return;
3612
3613 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
3614 while (r0) {
3615 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
3616 break;
3617 r0 = r0->next;
3618 }
3619
3620 if (r0 == NULL || r0->pmk_r1_pushed)
3621 return;
3622 r0->pmk_r1_pushed = 1;
3623
3624 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
3625 "for STA " MACSTR, MAC2STR(addr));
3626
3627 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
3628 if (is_zero_ether_addr(r1kh->addr) ||
3629 is_zero_ether_addr(r1kh->id))
3630 continue;
3631 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
3632 continue;
3633 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
3634 }
3635 }
3636
3637 #endif /* CONFIG_IEEE80211R_AP */
Unnamed repository; edit this file 'description' to name the repository.