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FT: Handle AssocResp generation failures as fatal errors
[thirdparty/hostap.git] / src / ap / wpa_auth_ft.c
1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2018, 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/sha384.h"
20 #include "crypto/random.h"
21 #include "ap_config.h"
22 #include "ieee802_11.h"
23 #include "wmm.h"
24 #include "wpa_auth.h"
25 #include "wpa_auth_i.h"
26
27
28 #ifdef CONFIG_IEEE80211R_AP
29
30 const unsigned int ftRRBseqTimeout = 10;
31 const unsigned int ftRRBmaxQueueLen = 100;
32
33
34 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
35 const u8 *current_ap, const u8 *sta_addr,
36 u16 status, const u8 *resp_ies,
37 size_t resp_ies_len);
38 static void ft_finish_pull(struct wpa_state_machine *sm);
39 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
40 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);
41
42 struct tlv_list {
43 u16 type;
44 size_t len;
45 const u8 *data;
46 };
47
48
49 /**
50 * wpa_ft_rrb_decrypt - Decrypt FT RRB message
51 * @key: AES-SIV key for AEAD
52 * @key_len: Length of key in octets
53 * @enc: Pointer to encrypted TLVs
54 * @enc_len: Length of encrypted TLVs in octets
55 * @auth: Pointer to authenticated TLVs
56 * @auth_len: Length of authenticated TLVs in octets
57 * @src_addr: MAC address of the frame sender
58 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
59 * @plain: Pointer to return the pointer to the allocated plaintext buffer;
60 * needs to be freed by the caller if not NULL;
61 * will only be returned on success
62 * @plain_len: Pointer to return the length of the allocated plaintext buffer
63 * in octets
64 * Returns: 0 on success, -1 on error
65 */
66 static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
67 const u8 *enc, const size_t enc_len,
68 const u8 *auth, const size_t auth_len,
69 const u8 *src_addr, u8 type,
70 u8 **plain, size_t *plain_size)
71 {
72 const u8 *ad[3] = { src_addr, auth, &type };
73 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
74
75 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
76
77 if (!key) { /* skip decryption */
78 *plain = os_memdup(enc, enc_len);
79 if (enc_len > 0 && !*plain)
80 goto err;
81
82 *plain_size = enc_len;
83
84 return 0;
85 }
86
87 *plain = NULL;
88
89 /* SIV overhead */
90 if (enc_len < AES_BLOCK_SIZE)
91 goto err;
92
93 *plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
94 if (!*plain)
95 goto err;
96
97 if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
98 *plain) < 0)
99 goto err;
100
101 *plain_size = enc_len - AES_BLOCK_SIZE;
102 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
103 *plain, *plain_size);
104 return 0;
105 err:
106 os_free(*plain);
107 *plain = NULL;
108 *plain_size = 0;
109
110 wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");
111
112 return -1;
113 }
114
115
116 /* get first tlv record in packet matching type
117 * @data (decrypted) packet
118 * @return 0 on success else -1
119 */
120 static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
121 u16 type, size_t *tlv_len, const u8 **tlv_data)
122 {
123 const struct ft_rrb_tlv *f;
124 size_t left;
125 le16 type16;
126 size_t len;
127
128 left = plain_len;
129 type16 = host_to_le16(type);
130
131 while (left >= sizeof(*f)) {
132 f = (const struct ft_rrb_tlv *) plain;
133
134 left -= sizeof(*f);
135 plain += sizeof(*f);
136 len = le_to_host16(f->len);
137
138 if (left < len) {
139 wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
140 break;
141 }
142
143 if (f->type == type16) {
144 *tlv_len = len;
145 *tlv_data = plain;
146 return 0;
147 }
148
149 left -= len;
150 plain += len;
151 }
152
153 return -1;
154 }
155
156
157 static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
158 {
159 const struct ft_rrb_tlv *f;
160 size_t left;
161 size_t len;
162
163 left = plain_len;
164
165 wpa_printf(MSG_DEBUG, "FT: RRB dump message");
166 while (left >= sizeof(*f)) {
167 f = (const struct ft_rrb_tlv *) plain;
168
169 left -= sizeof(*f);
170 plain += sizeof(*f);
171 len = le_to_host16(f->len);
172
173 wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
174 le_to_host16(f->type), len);
175
176 if (left < len) {
177 wpa_printf(MSG_DEBUG,
178 "FT: RRB message truncated: left %zu bytes, need %zu",
179 left, len);
180 break;
181 }
182
183 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);
184
185 left -= len;
186 plain += len;
187 }
188
189 if (left > 0)
190 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);
191
192 wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
193 }
194
195
196 static int cmp_int(const void *a, const void *b)
197 {
198 int x, y;
199
200 x = *((int *) a);
201 y = *((int *) b);
202 return x - y;
203 }
204
205
206 static int wpa_ft_rrb_get_tlv_vlan(const u8 *plain, const size_t plain_len,
207 struct vlan_description *vlan)
208 {
209 struct ft_rrb_tlv *f;
210 size_t left;
211 size_t len;
212 int taggedidx;
213 int vlan_id;
214 int type;
215
216 left = plain_len;
217 taggedidx = 0;
218 os_memset(vlan, 0, sizeof(*vlan));
219
220 while (left >= sizeof(*f)) {
221 f = (struct ft_rrb_tlv *) plain;
222
223 left -= sizeof(*f);
224 plain += sizeof(*f);
225
226 len = le_to_host16(f->len);
227 type = le_to_host16(f->type);
228
229 if (left < len) {
230 wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
231 return -1;
232 }
233
234 if (type != FT_RRB_VLAN_UNTAGGED && type != FT_RRB_VLAN_TAGGED)
235 goto skip;
236
237 if (type == FT_RRB_VLAN_UNTAGGED && len != sizeof(le16)) {
238 wpa_printf(MSG_DEBUG,
239 "FT: RRB VLAN_UNTAGGED invalid length");
240 return -1;
241 }
242
243 if (type == FT_RRB_VLAN_TAGGED && len % sizeof(le16) != 0) {
244 wpa_printf(MSG_DEBUG,
245 "FT: RRB VLAN_TAGGED invalid length");
246 return -1;
247 }
248
249 while (len >= sizeof(le16)) {
250 vlan_id = WPA_GET_LE16(plain);
251 plain += sizeof(le16);
252 left -= sizeof(le16);
253 len -= sizeof(le16);
254
255 if (vlan_id <= 0 || vlan_id > MAX_VLAN_ID) {
256 wpa_printf(MSG_DEBUG,
257 "FT: RRB VLAN ID invalid %d",
258 vlan_id);
259 continue;
260 }
261
262 if (type == FT_RRB_VLAN_UNTAGGED)
263 vlan->untagged = vlan_id;
264
265 if (type == FT_RRB_VLAN_TAGGED &&
266 taggedidx < MAX_NUM_TAGGED_VLAN) {
267 vlan->tagged[taggedidx] = vlan_id;
268 taggedidx++;
269 } else if (type == FT_RRB_VLAN_TAGGED) {
270 wpa_printf(MSG_DEBUG, "FT: RRB too many VLANs");
271 }
272 }
273
274 skip:
275 left -= len;
276 plain += len;
277 }
278
279 if (taggedidx)
280 qsort(vlan->tagged, taggedidx, sizeof(int), cmp_int);
281
282 vlan->notempty = vlan->untagged || vlan->tagged[0];
283
284 return 0;
285 }
286
287
288 static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
289 {
290 size_t tlv_len = 0;
291 int i;
292
293 if (!tlvs)
294 return 0;
295
296 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
297 tlv_len += sizeof(struct ft_rrb_tlv);
298 tlv_len += tlvs[i].len;
299 }
300
301 return tlv_len;
302 }
303
304
305 static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
306 u8 *endpos)
307 {
308 int i;
309 size_t tlv_len;
310 struct ft_rrb_tlv *hdr;
311 u8 *pos;
312
313 if (!tlvs)
314 return 0;
315
316 tlv_len = 0;
317 pos = start;
318 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
319 if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
320 return tlv_len;
321 tlv_len += sizeof(*hdr);
322 hdr = (struct ft_rrb_tlv *) pos;
323 hdr->type = host_to_le16(tlvs[i].type);
324 hdr->len = host_to_le16(tlvs[i].len);
325 pos = start + tlv_len;
326
327 if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
328 return tlv_len;
329 if (tlvs[i].len == 0)
330 continue;
331 tlv_len += tlvs[i].len;
332 os_memcpy(pos, tlvs[i].data, tlvs[i].len);
333 pos = start + tlv_len;
334 }
335
336 return tlv_len;
337 }
338
339
340 static size_t wpa_ft_vlan_len(const struct vlan_description *vlan)
341 {
342 size_t tlv_len = 0;
343 int i;
344
345 if (!vlan || !vlan->notempty)
346 return 0;
347
348 if (vlan->untagged) {
349 tlv_len += sizeof(struct ft_rrb_tlv);
350 tlv_len += sizeof(le16);
351 }
352 if (vlan->tagged[0])
353 tlv_len += sizeof(struct ft_rrb_tlv);
354 for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++)
355 tlv_len += sizeof(le16);
356
357 return tlv_len;
358 }
359
360
361 static size_t wpa_ft_vlan_lin(const struct vlan_description *vlan,
362 u8 *start, u8 *endpos)
363 {
364 size_t tlv_len;
365 int i, len;
366 struct ft_rrb_tlv *hdr;
367 u8 *pos = start;
368
369 if (!vlan || !vlan->notempty)
370 return 0;
371
372 tlv_len = 0;
373 if (vlan->untagged) {
374 tlv_len += sizeof(*hdr);
375 if (start + tlv_len > endpos)
376 return tlv_len;
377 hdr = (struct ft_rrb_tlv *) pos;
378 hdr->type = host_to_le16(FT_RRB_VLAN_UNTAGGED);
379 hdr->len = host_to_le16(sizeof(le16));
380 pos = start + tlv_len;
381
382 tlv_len += sizeof(le16);
383 if (start + tlv_len > endpos)
384 return tlv_len;
385 WPA_PUT_LE16(pos, vlan->untagged);
386 pos = start + tlv_len;
387 }
388
389 if (!vlan->tagged[0])
390 return tlv_len;
391
392 tlv_len += sizeof(*hdr);
393 if (start + tlv_len > endpos)
394 return tlv_len;
395 hdr = (struct ft_rrb_tlv *) pos;
396 hdr->type = host_to_le16(FT_RRB_VLAN_TAGGED);
397 len = 0; /* len is computed below */
398 pos = start + tlv_len;
399
400 for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) {
401 tlv_len += sizeof(le16);
402 if (start + tlv_len > endpos)
403 break;
404 len += sizeof(le16);
405 WPA_PUT_LE16(pos, vlan->tagged[i]);
406 pos = start + tlv_len;
407 }
408
409 hdr->len = host_to_le16(len);
410
411 return tlv_len;
412 }
413
414
415 static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
416 const struct tlv_list *tlvs2,
417 const struct vlan_description *vlan,
418 u8 **plain, size_t *plain_len)
419 {
420 u8 *pos, *endpos;
421 size_t tlv_len;
422
423 tlv_len = wpa_ft_tlv_len(tlvs1);
424 tlv_len += wpa_ft_tlv_len(tlvs2);
425 tlv_len += wpa_ft_vlan_len(vlan);
426
427 *plain_len = tlv_len;
428 *plain = os_zalloc(tlv_len);
429 if (!*plain) {
430 wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
431 goto err;
432 }
433
434 pos = *plain;
435 endpos = *plain + tlv_len;
436 pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
437 pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
438 pos += wpa_ft_vlan_lin(vlan, pos, endpos);
439
440 /* sanity check */
441 if (pos != endpos) {
442 wpa_printf(MSG_ERROR, "FT: Length error building RRB");
443 goto err;
444 }
445
446 return 0;
447
448 err:
449 os_free(*plain);
450 *plain = NULL;
451 *plain_len = 0;
452 return -1;
453 }
454
455
456 static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
457 const u8 *plain, const size_t plain_len,
458 const u8 *auth, const size_t auth_len,
459 const u8 *src_addr, u8 type, u8 *enc)
460 {
461 const u8 *ad[3] = { src_addr, auth, &type };
462 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
463
464 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
465 plain, plain_len);
466 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
467
468 if (!key) {
469 /* encryption not needed, return plaintext as packet */
470 os_memcpy(enc, plain, plain_len);
471 } else if (aes_siv_encrypt(key, key_len, plain, plain_len,
472 3, ad, ad_len, enc) < 0) {
473 wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
474 return -1;
475 }
476
477 return 0;
478 }
479
480
481 /**
482 * wpa_ft_rrb_build - Build and encrypt an FT RRB message
483 * @key: AES-SIV key for AEAD
484 * @key_len: Length of key in octets
485 * @tlvs_enc0: First set of to-be-encrypted TLVs
486 * @tlvs_enc1: Second set of to-be-encrypted TLVs
487 * @tlvs_auth: Set of to-be-authenticated TLVs
488 * @src_addr: MAC address of the frame sender
489 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
490 * @packet Pointer to return the pointer to the allocated packet buffer;
491 * needs to be freed by the caller if not null;
492 * will only be returned on success
493 * @packet_len: Pointer to return the length of the allocated buffer in octets
494 * Returns: 0 on success, -1 on error
495 */
496 static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
497 const struct tlv_list *tlvs_enc0,
498 const struct tlv_list *tlvs_enc1,
499 const struct tlv_list *tlvs_auth,
500 const struct vlan_description *vlan,
501 const u8 *src_addr, u8 type,
502 u8 **packet, size_t *packet_len)
503 {
504 u8 *plain = NULL, *auth = NULL, *pos;
505 size_t plain_len = 0, auth_len = 0;
506 int ret = -1;
507
508 *packet = NULL;
509 if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, vlan, &plain, &plain_len) < 0)
510 goto out;
511
512 if (wpa_ft_rrb_lin(tlvs_auth, NULL, NULL, &auth, &auth_len) < 0)
513 goto out;
514
515 *packet_len = sizeof(u16) + auth_len + plain_len;
516 if (key)
517 *packet_len += AES_BLOCK_SIZE;
518 *packet = os_zalloc(*packet_len);
519 if (!*packet)
520 goto out;
521
522 pos = *packet;
523 WPA_PUT_LE16(pos, auth_len);
524 pos += 2;
525 os_memcpy(pos, auth, auth_len);
526 pos += auth_len;
527 if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
528 auth_len, src_addr, type, pos) < 0)
529 goto out;
530
531 ret = 0;
532
533 out:
534 bin_clear_free(plain, plain_len);
535 os_free(auth);
536
537 if (ret) {
538 wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
539 os_free(*packet);
540 *packet = NULL;
541 *packet_len = 0;
542 }
543
544 return ret;
545 }
546
547
548 #define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
549 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
550 &f_##field##_len, &f_##field) < 0 || \
551 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
552 wpa_printf(MSG_INFO, "FT: Missing required " #field \
553 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
554 wpa_ft_rrb_dump(srcfield, srcfield##_len); \
555 goto out; \
556 } \
557 } while (0)
558
559 #define RRB_GET(type, field, txt, checklength) \
560 RRB_GET_SRC(plain, type, field, txt, checklength)
561 #define RRB_GET_AUTH(type, field, txt, checklength) \
562 RRB_GET_SRC(auth, type, field, txt, checklength)
563
564 #define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
565 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
566 &f_##field##_len, &f_##field) < 0 || \
567 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
568 wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
569 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
570 f_##field##_len = 0; \
571 f_##field = NULL; \
572 } \
573 } while (0)
574
575 #define RRB_GET_OPTIONAL(type, field, txt, checklength) \
576 RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
577 #define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
578 RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)
579
580 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
581 const u8 *data, size_t data_len)
582 {
583 if (wpa_auth->cb->send_ether == NULL)
584 return -1;
585 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
586 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
587 data, data_len);
588 }
589
590
591 static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
592 const u8 *dst, u8 oui_suffix,
593 const u8 *data, size_t data_len)
594 {
595 if (!wpa_auth->cb->send_oui)
596 return -1;
597 wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR,
598 oui_suffix, MAC2STR(dst));
599 return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data,
600 data_len);
601 }
602
603
604 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
605 const u8 *dst, const u8 *data, size_t data_len)
606 {
607 if (wpa_auth->cb->send_ft_action == NULL)
608 return -1;
609 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
610 data, data_len);
611 }
612
613
614 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
615 const u8 *addr, const u8 *p2p_dev_addr,
616 const u8 *prev_psk)
617 {
618 if (wpa_auth->cb->get_psk == NULL)
619 return NULL;
620 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
621 prev_psk, NULL);
622 }
623
624
625 static struct wpa_state_machine *
626 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
627 {
628 if (wpa_auth->cb->add_sta == NULL)
629 return NULL;
630 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
631 }
632
633
634 static int wpa_ft_set_vlan(struct wpa_authenticator *wpa_auth,
635 const u8 *sta_addr, struct vlan_description *vlan)
636 {
637 if (!wpa_auth->cb->set_vlan)
638 return -1;
639 return wpa_auth->cb->set_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
640 }
641
642
643 static int wpa_ft_get_vlan(struct wpa_authenticator *wpa_auth,
644 const u8 *sta_addr, struct vlan_description *vlan)
645 {
646 if (!wpa_auth->cb->get_vlan)
647 return -1;
648 return wpa_auth->cb->get_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
649 }
650
651
652 static int
653 wpa_ft_set_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
654 const u8 *identity, size_t identity_len)
655 {
656 if (!wpa_auth->cb->set_identity)
657 return -1;
658 return wpa_auth->cb->set_identity(wpa_auth->cb_ctx, sta_addr, identity,
659 identity_len);
660 }
661
662
663 static size_t
664 wpa_ft_get_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
665 const u8 **buf)
666 {
667 *buf = NULL;
668 if (!wpa_auth->cb->get_identity)
669 return 0;
670 return wpa_auth->cb->get_identity(wpa_auth->cb_ctx, sta_addr, buf);
671 }
672
673
674 static int
675 wpa_ft_set_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
676 const u8 *radius_cui, size_t radius_cui_len)
677 {
678 if (!wpa_auth->cb->set_radius_cui)
679 return -1;
680 return wpa_auth->cb->set_radius_cui(wpa_auth->cb_ctx, sta_addr,
681 radius_cui, radius_cui_len);
682 }
683
684
685 static size_t
686 wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
687 const u8 **buf)
688 {
689 *buf = NULL;
690 if (!wpa_auth->cb->get_radius_cui)
691 return 0;
692 return wpa_auth->cb->get_radius_cui(wpa_auth->cb_ctx, sta_addr, buf);
693 }
694
695
696 static void
697 wpa_ft_set_session_timeout(struct wpa_authenticator *wpa_auth,
698 const u8 *sta_addr, int session_timeout)
699 {
700 if (!wpa_auth->cb->set_session_timeout)
701 return;
702 wpa_auth->cb->set_session_timeout(wpa_auth->cb_ctx, sta_addr,
703 session_timeout);
704 }
705
706
707 static int
708 wpa_ft_get_session_timeout(struct wpa_authenticator *wpa_auth,
709 const u8 *sta_addr)
710 {
711 if (!wpa_auth->cb->get_session_timeout)
712 return 0;
713 return wpa_auth->cb->get_session_timeout(wpa_auth->cb_ctx, sta_addr);
714 }
715
716
717 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
718 const u8 *sta_addr,
719 u8 *tspec_ie, size_t tspec_ielen)
720 {
721 if (wpa_auth->cb->add_tspec == NULL) {
722 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
723 return -1;
724 }
725 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
726 tspec_ielen);
727 }
728
729
730 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
731 {
732 u8 *pos = buf;
733 u8 capab;
734 if (len < 2 + sizeof(struct rsn_mdie))
735 return -1;
736
737 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
738 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
739 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
740 pos += MOBILITY_DOMAIN_ID_LEN;
741 capab = 0;
742 if (conf->ft_over_ds)
743 capab |= RSN_FT_CAPAB_FT_OVER_DS;
744 *pos++ = capab;
745
746 return pos - buf;
747 }
748
749
750 int wpa_write_ftie(struct wpa_auth_config *conf, int use_sha384,
751 const u8 *r0kh_id, size_t r0kh_id_len,
752 const u8 *anonce, const u8 *snonce,
753 u8 *buf, size_t len, const u8 *subelem,
754 size_t subelem_len)
755 {
756 u8 *pos = buf, *ielen;
757 size_t hdrlen = use_sha384 ? sizeof(struct rsn_ftie_sha384) :
758 sizeof(struct rsn_ftie);
759
760 if (len < 2 + hdrlen + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
761 subelem_len)
762 return -1;
763
764 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
765 ielen = pos++;
766
767 if (use_sha384) {
768 struct rsn_ftie_sha384 *hdr = (struct rsn_ftie_sha384 *) pos;
769
770 os_memset(hdr, 0, sizeof(*hdr));
771 pos += sizeof(*hdr);
772 WPA_PUT_LE16(hdr->mic_control, 0);
773 if (anonce)
774 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
775 if (snonce)
776 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
777 } else {
778 struct rsn_ftie *hdr = (struct rsn_ftie *) pos;
779
780 os_memset(hdr, 0, sizeof(*hdr));
781 pos += sizeof(*hdr);
782 WPA_PUT_LE16(hdr->mic_control, 0);
783 if (anonce)
784 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
785 if (snonce)
786 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
787 }
788
789 /* Optional Parameters */
790 *pos++ = FTIE_SUBELEM_R1KH_ID;
791 *pos++ = FT_R1KH_ID_LEN;
792 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
793 pos += FT_R1KH_ID_LEN;
794
795 if (r0kh_id) {
796 *pos++ = FTIE_SUBELEM_R0KH_ID;
797 *pos++ = r0kh_id_len;
798 os_memcpy(pos, r0kh_id, r0kh_id_len);
799 pos += r0kh_id_len;
800 }
801
802 if (subelem) {
803 os_memcpy(pos, subelem, subelem_len);
804 pos += subelem_len;
805 }
806
807 *ielen = pos - buf - 2;
808
809 return pos - buf;
810 }
811
812
813 /* A packet to be handled after seq response */
814 struct ft_remote_item {
815 struct dl_list list;
816
817 u8 nonce[FT_RRB_NONCE_LEN];
818 struct os_reltime nonce_ts;
819
820 u8 src_addr[ETH_ALEN];
821 u8 *enc;
822 size_t enc_len;
823 u8 *auth;
824 size_t auth_len;
825 int (*cb)(struct wpa_authenticator *wpa_auth,
826 const u8 *src_addr,
827 const u8 *enc, size_t enc_len,
828 const u8 *auth, size_t auth_len,
829 int no_defer);
830 };
831
832
833 static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
834 {
835 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
836 dl_list_del(&item->list);
837 bin_clear_free(item->enc, item->enc_len);
838 os_free(item->auth);
839 os_free(item);
840 }
841
842
843 static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
844 struct ft_remote_seq *rkh_seq, int cb)
845 {
846 struct ft_remote_item *item, *n;
847
848 dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
849 struct ft_remote_item, list) {
850 if (cb && item->cb)
851 item->cb(wpa_auth, item->src_addr, item->enc,
852 item->enc_len, item->auth, item->auth_len, 1);
853 wpa_ft_rrb_seq_free(item);
854 }
855 }
856
857
858 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
859 {
860 struct ft_remote_item *item = timeout_ctx;
861
862 wpa_ft_rrb_seq_free(item);
863 }
864
865
866 static int
867 wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
868 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
869 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
870 const u8 *f_r1kh_id, const u8 *key, size_t key_len,
871 const u8 *enc, size_t enc_len,
872 const u8 *auth, size_t auth_len,
873 int (*cb)(struct wpa_authenticator *wpa_auth,
874 const u8 *src_addr,
875 const u8 *enc, size_t enc_len,
876 const u8 *auth, size_t auth_len,
877 int no_defer))
878 {
879 struct ft_remote_item *item = NULL;
880 u8 *packet = NULL;
881 size_t packet_len;
882 struct tlv_list seq_req_auth[] = {
883 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
884 .data = NULL /* to be filled: item->nonce */ },
885 { .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
886 .data = f_r0kh_id },
887 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
888 .data = f_r1kh_id },
889 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
890 };
891
892 if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
893 wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
894 goto err;
895 }
896
897 item = os_zalloc(sizeof(*item));
898 if (!item)
899 goto err;
900
901 os_memcpy(item->src_addr, src_addr, ETH_ALEN);
902 item->cb = cb;
903
904 if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
905 wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
906 goto err;
907 }
908
909 if (os_get_reltime(&item->nonce_ts) < 0)
910 goto err;
911
912 if (enc && enc_len > 0) {
913 item->enc = os_memdup(enc, enc_len);
914 item->enc_len = enc_len;
915 if (!item->enc)
916 goto err;
917 }
918
919 if (auth && auth_len > 0) {
920 item->auth = os_memdup(auth, auth_len);
921 item->auth_len = auth_len;
922 if (!item->auth)
923 goto err;
924 }
925
926 eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
927 wpa_auth, item);
928
929 seq_req_auth[0].data = item->nonce;
930
931 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth, NULL,
932 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
933 &packet, &packet_len) < 0) {
934 item = NULL; /* some other seq resp might still accept this */
935 goto err;
936 }
937
938 dl_list_add(&rkh_seq->rx.queue, &item->list);
939
940 wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
941 packet, packet_len);
942
943 os_free(packet);
944
945 return 0;
946 err:
947 wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
948 if (item) {
949 os_free(item->auth);
950 bin_clear_free(item->enc, item->enc_len);
951 os_free(item);
952 }
953
954 return -1;
955 }
956
957
958 #define FT_RRB_SEQ_OK 0
959 #define FT_RRB_SEQ_DROP 1
960 #define FT_RRB_SEQ_DEFER 2
961
962 static int
963 wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
964 const u8 *enc, size_t enc_len,
965 const u8 *auth, size_t auth_len,
966 const char *msgtype, int no_defer)
967 {
968 const u8 *f_seq;
969 size_t f_seq_len;
970 const struct ft_rrb_seq *msg_both;
971 u32 msg_seq, msg_off, rkh_off;
972 struct os_reltime now;
973 unsigned int i;
974
975 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
976 wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
977 msg_both = (const struct ft_rrb_seq *) f_seq;
978
979 if (rkh_seq->rx.num_last == 0) {
980 /* first packet from remote */
981 goto defer;
982 }
983
984 if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
985 /* remote might have rebooted */
986 goto defer;
987 }
988
989 if (os_get_reltime(&now) == 0) {
990 u32 msg_ts_now_remote, msg_ts_off;
991 struct os_reltime now_remote;
992
993 os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
994 msg_ts_now_remote = now_remote.sec;
995 msg_ts_off = le_to_host32(msg_both->ts) -
996 (msg_ts_now_remote - ftRRBseqTimeout);
997 if (msg_ts_off > 2 * ftRRBseqTimeout)
998 goto defer;
999 }
1000
1001 msg_seq = le_to_host32(msg_both->seq);
1002 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
1003 msg_off = msg_seq - rkh_off;
1004 if (msg_off > 0xC0000000)
1005 goto out; /* too old message, drop it */
1006
1007 if (msg_off <= 0x40000000) {
1008 for (i = 0; i < rkh_seq->rx.num_last; i++) {
1009 if (rkh_seq->rx.last[i] == msg_seq)
1010 goto out; /* duplicate message, drop it */
1011 }
1012
1013 return FT_RRB_SEQ_OK;
1014 }
1015
1016 defer:
1017 if (no_defer)
1018 goto out;
1019
1020 wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
1021 MACSTR, msgtype, MAC2STR(src_addr));
1022
1023 return FT_RRB_SEQ_DEFER;
1024 out:
1025 wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
1026 msgtype, MAC2STR(src_addr));
1027
1028 return FT_RRB_SEQ_DROP;
1029 }
1030
1031
1032 static void
1033 wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
1034 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
1035 const u8 *auth, size_t auth_len,
1036 const char *msgtype)
1037 {
1038 const u8 *f_seq;
1039 size_t f_seq_len;
1040 const struct ft_rrb_seq *msg_both;
1041 u32 msg_seq, msg_off, min_off, rkh_off;
1042 int minidx = 0;
1043 unsigned int i;
1044
1045 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
1046 msg_both = (const struct ft_rrb_seq *) f_seq;
1047
1048 msg_seq = le_to_host32(msg_both->seq);
1049
1050 if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
1051 rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
1052 rkh_seq->rx.num_last++;
1053 return;
1054 }
1055
1056 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
1057 for (i = 0; i < rkh_seq->rx.num_last; i++) {
1058 msg_off = rkh_seq->rx.last[i] - rkh_off;
1059 min_off = rkh_seq->rx.last[minidx] - rkh_off;
1060 if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
1061 minidx = i;
1062 }
1063 rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
1064 rkh_seq->rx.offsetidx = minidx;
1065
1066 return;
1067 out:
1068 /* RRB_GET_AUTH should never fail here as
1069 * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
1070 wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
1071 }
1072
1073
1074 static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
1075 struct ft_rrb_seq *f_seq)
1076 {
1077 struct os_reltime now;
1078
1079 if (os_get_reltime(&now) < 0)
1080 return -1;
1081
1082 if (!rkh_seq->tx.dom) {
1083 if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
1084 sizeof(rkh_seq->tx.seq))) {
1085 wpa_printf(MSG_ERROR,
1086 "FT: Failed to get random data for sequence number initialization");
1087 rkh_seq->tx.seq = now.usec;
1088 }
1089 if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
1090 sizeof(rkh_seq->tx.dom))) {
1091 wpa_printf(MSG_ERROR,
1092 "FT: Failed to get random data for sequence number initialization");
1093 rkh_seq->tx.dom = now.usec;
1094 }
1095 rkh_seq->tx.dom |= 1;
1096 }
1097
1098 f_seq->dom = host_to_le32(rkh_seq->tx.dom);
1099 f_seq->seq = host_to_le32(rkh_seq->tx.seq);
1100 f_seq->ts = host_to_le32(now.sec);
1101
1102 rkh_seq->tx.seq++;
1103
1104 return 0;
1105 }
1106
1107
1108 struct wpa_ft_pmk_r0_sa {
1109 struct dl_list list;
1110 u8 pmk_r0[PMK_LEN_MAX];
1111 size_t pmk_r0_len;
1112 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
1113 u8 spa[ETH_ALEN];
1114 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
1115 struct vlan_description *vlan;
1116 os_time_t expiration; /* 0 for no expiration */
1117 u8 *identity;
1118 size_t identity_len;
1119 u8 *radius_cui;
1120 size_t radius_cui_len;
1121 os_time_t session_timeout; /* 0 for no expiration */
1122 /* TODO: radius_class, EAP type */
1123 int pmk_r1_pushed;
1124 };
1125
1126 struct wpa_ft_pmk_r1_sa {
1127 struct dl_list list;
1128 u8 pmk_r1[PMK_LEN_MAX];
1129 size_t pmk_r1_len;
1130 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
1131 u8 spa[ETH_ALEN];
1132 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
1133 struct vlan_description *vlan;
1134 u8 *identity;
1135 size_t identity_len;
1136 u8 *radius_cui;
1137 size_t radius_cui_len;
1138 os_time_t session_timeout; /* 0 for no expiration */
1139 /* TODO: radius_class, EAP type */
1140 };
1141
1142 struct wpa_ft_pmk_cache {
1143 struct dl_list pmk_r0; /* struct wpa_ft_pmk_r0_sa */
1144 struct dl_list pmk_r1; /* struct wpa_ft_pmk_r1_sa */
1145 };
1146
1147
1148 static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx);
1149 static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx);
1150
1151
1152 static void wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa *r0)
1153 {
1154 if (!r0)
1155 return;
1156
1157 dl_list_del(&r0->list);
1158 eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
1159
1160 os_memset(r0->pmk_r0, 0, PMK_LEN_MAX);
1161 os_free(r0->vlan);
1162 os_free(r0->identity);
1163 os_free(r0->radius_cui);
1164 os_free(r0);
1165 }
1166
1167
1168 static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx)
1169 {
1170 struct wpa_ft_pmk_r0_sa *r0 = eloop_ctx;
1171 struct os_reltime now;
1172 int expires_in;
1173 int session_timeout;
1174
1175 os_get_reltime(&now);
1176
1177 if (!r0)
1178 return;
1179
1180 expires_in = r0->expiration - now.sec;
1181 session_timeout = r0->session_timeout - now.sec;
1182 /* conditions to remove from cache:
1183 * a) r0->expiration is set and hit
1184 * -or-
1185 * b) r0->session_timeout is set and hit
1186 */
1187 if ((!r0->expiration || expires_in > 0) &&
1188 (!r0->session_timeout || session_timeout > 0)) {
1189 wpa_printf(MSG_ERROR,
1190 "FT: %s() called for non-expired entry %p",
1191 __func__, r0);
1192 eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
1193 if (r0->expiration && expires_in > 0)
1194 eloop_register_timeout(expires_in + 1, 0,
1195 wpa_ft_expire_pmk_r0, r0, NULL);
1196 if (r0->session_timeout && session_timeout > 0)
1197 eloop_register_timeout(session_timeout + 1, 0,
1198 wpa_ft_expire_pmk_r0, r0, NULL);
1199 return;
1200 }
1201
1202 wpa_ft_free_pmk_r0(r0);
1203 }
1204
1205
1206 static void wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa *r1)
1207 {
1208 if (!r1)
1209 return;
1210
1211 dl_list_del(&r1->list);
1212 eloop_cancel_timeout(wpa_ft_expire_pmk_r1, r1, NULL);
1213
1214 os_memset(r1->pmk_r1, 0, PMK_LEN_MAX);
1215 os_free(r1->vlan);
1216 os_free(r1->identity);
1217 os_free(r1->radius_cui);
1218 os_free(r1);
1219 }
1220
1221
1222 static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx)
1223 {
1224 struct wpa_ft_pmk_r1_sa *r1 = eloop_ctx;
1225
1226 wpa_ft_free_pmk_r1(r1);
1227 }
1228
1229
1230 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
1231 {
1232 struct wpa_ft_pmk_cache *cache;
1233
1234 cache = os_zalloc(sizeof(*cache));
1235 if (cache) {
1236 dl_list_init(&cache->pmk_r0);
1237 dl_list_init(&cache->pmk_r1);
1238 }
1239
1240 return cache;
1241 }
1242
1243
1244 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
1245 {
1246 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
1247 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
1248
1249 dl_list_for_each_safe(r0, r0prev, &cache->pmk_r0,
1250 struct wpa_ft_pmk_r0_sa, list)
1251 wpa_ft_free_pmk_r0(r0);
1252
1253 dl_list_for_each_safe(r1, r1prev, &cache->pmk_r1,
1254 struct wpa_ft_pmk_r1_sa, list)
1255 wpa_ft_free_pmk_r1(r1);
1256
1257 os_free(cache);
1258 }
1259
1260
1261 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
1262 const u8 *spa, const u8 *pmk_r0,
1263 size_t pmk_r0_len,
1264 const u8 *pmk_r0_name, int pairwise,
1265 const struct vlan_description *vlan,
1266 int expires_in, int session_timeout,
1267 const u8 *identity, size_t identity_len,
1268 const u8 *radius_cui, size_t radius_cui_len)
1269 {
1270 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1271 struct wpa_ft_pmk_r0_sa *r0;
1272 struct os_reltime now;
1273
1274 /* TODO: add limit on number of entries in cache */
1275 os_get_reltime(&now);
1276
1277 r0 = os_zalloc(sizeof(*r0));
1278 if (r0 == NULL)
1279 return -1;
1280
1281 os_memcpy(r0->pmk_r0, pmk_r0, pmk_r0_len);
1282 r0->pmk_r0_len = pmk_r0_len;
1283 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
1284 os_memcpy(r0->spa, spa, ETH_ALEN);
1285 r0->pairwise = pairwise;
1286 if (expires_in > 0)
1287 r0->expiration = now.sec + expires_in;
1288 if (vlan && vlan->notempty) {
1289 r0->vlan = os_zalloc(sizeof(*vlan));
1290 if (!r0->vlan) {
1291 bin_clear_free(r0, sizeof(*r0));
1292 return -1;
1293 }
1294 *r0->vlan = *vlan;
1295 }
1296 if (identity) {
1297 r0->identity = os_malloc(identity_len);
1298 if (r0->identity) {
1299 os_memcpy(r0->identity, identity, identity_len);
1300 r0->identity_len = identity_len;
1301 }
1302 }
1303 if (radius_cui) {
1304 r0->radius_cui = os_malloc(radius_cui_len);
1305 if (r0->radius_cui) {
1306 os_memcpy(r0->radius_cui, radius_cui, radius_cui_len);
1307 r0->radius_cui_len = radius_cui_len;
1308 }
1309 }
1310 if (session_timeout > 0)
1311 r0->session_timeout = now.sec + session_timeout;
1312
1313 dl_list_add(&cache->pmk_r0, &r0->list);
1314 if (expires_in > 0)
1315 eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0,
1316 r0, NULL);
1317 if (session_timeout > 0)
1318 eloop_register_timeout(session_timeout + 1, 0,
1319 wpa_ft_expire_pmk_r0, r0, NULL);
1320
1321 return 0;
1322 }
1323
1324
1325 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
1326 const u8 *spa, const u8 *pmk_r0_name,
1327 const struct wpa_ft_pmk_r0_sa **r0_out)
1328 {
1329 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1330 struct wpa_ft_pmk_r0_sa *r0;
1331 struct os_reltime now;
1332
1333 os_get_reltime(&now);
1334 dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
1335 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
1336 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
1337 WPA_PMK_NAME_LEN) == 0) {
1338 *r0_out = r0;
1339 return 0;
1340 }
1341 }
1342
1343 *r0_out = NULL;
1344 return -1;
1345 }
1346
1347
1348 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
1349 const u8 *spa, const u8 *pmk_r1,
1350 size_t pmk_r1_len,
1351 const u8 *pmk_r1_name, int pairwise,
1352 const struct vlan_description *vlan,
1353 int expires_in, int session_timeout,
1354 const u8 *identity, size_t identity_len,
1355 const u8 *radius_cui, size_t radius_cui_len)
1356 {
1357 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1358 int max_expires_in = wpa_auth->conf.r1_max_key_lifetime;
1359 struct wpa_ft_pmk_r1_sa *r1;
1360 struct os_reltime now;
1361
1362 /* TODO: limit on number of entries in cache */
1363 os_get_reltime(&now);
1364
1365 if (max_expires_in && (max_expires_in < expires_in || expires_in == 0))
1366 expires_in = max_expires_in;
1367
1368 r1 = os_zalloc(sizeof(*r1));
1369 if (r1 == NULL)
1370 return -1;
1371
1372 os_memcpy(r1->pmk_r1, pmk_r1, pmk_r1_len);
1373 r1->pmk_r1_len = pmk_r1_len;
1374 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
1375 os_memcpy(r1->spa, spa, ETH_ALEN);
1376 r1->pairwise = pairwise;
1377 if (vlan && vlan->notempty) {
1378 r1->vlan = os_zalloc(sizeof(*vlan));
1379 if (!r1->vlan) {
1380 bin_clear_free(r1, sizeof(*r1));
1381 return -1;
1382 }
1383 *r1->vlan = *vlan;
1384 }
1385 if (identity) {
1386 r1->identity = os_malloc(identity_len);
1387 if (r1->identity) {
1388 os_memcpy(r1->identity, identity, identity_len);
1389 r1->identity_len = identity_len;
1390 }
1391 }
1392 if (radius_cui) {
1393 r1->radius_cui = os_malloc(radius_cui_len);
1394 if (r1->radius_cui) {
1395 os_memcpy(r1->radius_cui, radius_cui, radius_cui_len);
1396 r1->radius_cui_len = radius_cui_len;
1397 }
1398 }
1399 if (session_timeout > 0)
1400 r1->session_timeout = now.sec + session_timeout;
1401
1402 dl_list_add(&cache->pmk_r1, &r1->list);
1403
1404 if (expires_in > 0)
1405 eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r1,
1406 r1, NULL);
1407 if (session_timeout > 0)
1408 eloop_register_timeout(session_timeout + 1, 0,
1409 wpa_ft_expire_pmk_r1, r1, NULL);
1410
1411 return 0;
1412 }
1413
1414
1415 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
1416 const u8 *spa, const u8 *pmk_r1_name,
1417 u8 *pmk_r1, size_t *pmk_r1_len, int *pairwise,
1418 struct vlan_description *vlan,
1419 const u8 **identity, size_t *identity_len,
1420 const u8 **radius_cui, size_t *radius_cui_len,
1421 int *session_timeout)
1422 {
1423 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1424 struct wpa_ft_pmk_r1_sa *r1;
1425 struct os_reltime now;
1426
1427 os_get_reltime(&now);
1428
1429 dl_list_for_each(r1, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) {
1430 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
1431 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
1432 WPA_PMK_NAME_LEN) == 0) {
1433 os_memcpy(pmk_r1, r1->pmk_r1, r1->pmk_r1_len);
1434 *pmk_r1_len = r1->pmk_r1_len;
1435 if (pairwise)
1436 *pairwise = r1->pairwise;
1437 if (vlan && r1->vlan)
1438 *vlan = *r1->vlan;
1439 if (vlan && !r1->vlan)
1440 os_memset(vlan, 0, sizeof(*vlan));
1441 if (identity && identity_len) {
1442 *identity = r1->identity;
1443 *identity_len = r1->identity_len;
1444 }
1445 if (radius_cui && radius_cui_len) {
1446 *radius_cui = r1->radius_cui;
1447 *radius_cui_len = r1->radius_cui_len;
1448 }
1449 if (session_timeout && r1->session_timeout > now.sec)
1450 *session_timeout = r1->session_timeout -
1451 now.sec;
1452 else if (session_timeout && r1->session_timeout)
1453 *session_timeout = 1;
1454 else
1455 *session_timeout = 0;
1456 return 0;
1457 }
1458 }
1459
1460 return -1;
1461 }
1462
1463
1464 static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
1465 {
1466 if (r0kh->seq)
1467 return 0;
1468
1469 r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
1470 if (!r0kh->seq) {
1471 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
1472 return -1;
1473 }
1474
1475 dl_list_init(&r0kh->seq->rx.queue);
1476
1477 return 0;
1478 }
1479
1480
1481 static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
1482 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
1483 struct ft_remote_r0kh **r0kh_out,
1484 struct ft_remote_r0kh **r0kh_wildcard)
1485 {
1486 struct ft_remote_r0kh *r0kh;
1487
1488 *r0kh_wildcard = NULL;
1489 *r0kh_out = NULL;
1490
1491 if (wpa_auth->conf.r0kh_list)
1492 r0kh = *wpa_auth->conf.r0kh_list;
1493 else
1494 r0kh = NULL;
1495 for (; r0kh; r0kh = r0kh->next) {
1496 if (r0kh->id_len == 1 && r0kh->id[0] == '*')
1497 *r0kh_wildcard = r0kh;
1498 if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
1499 os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
1500 *r0kh_out = r0kh;
1501 }
1502
1503 if (!*r0kh_out && !*r0kh_wildcard)
1504 wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");
1505
1506 if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
1507 *r0kh_out = NULL;
1508 }
1509
1510
1511 static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
1512 {
1513 if (r1kh->seq)
1514 return 0;
1515
1516 r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
1517 if (!r1kh->seq) {
1518 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
1519 return -1;
1520 }
1521
1522 dl_list_init(&r1kh->seq->rx.queue);
1523
1524 return 0;
1525 }
1526
1527
1528 static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
1529 const u8 *f_r1kh_id,
1530 struct ft_remote_r1kh **r1kh_out,
1531 struct ft_remote_r1kh **r1kh_wildcard)
1532 {
1533 struct ft_remote_r1kh *r1kh;
1534
1535 *r1kh_wildcard = NULL;
1536 *r1kh_out = NULL;
1537
1538 if (wpa_auth->conf.r1kh_list)
1539 r1kh = *wpa_auth->conf.r1kh_list;
1540 else
1541 r1kh = NULL;
1542 for (; r1kh; r1kh = r1kh->next) {
1543 if (is_zero_ether_addr(r1kh->addr) &&
1544 is_zero_ether_addr(r1kh->id))
1545 *r1kh_wildcard = r1kh;
1546 if (f_r1kh_id &&
1547 os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
1548 *r1kh_out = r1kh;
1549 }
1550
1551 if (!*r1kh_out && !*r1kh_wildcard)
1552 wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");
1553
1554 if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
1555 *r1kh_out = NULL;
1556 }
1557
1558
1559 static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
1560 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1561 {
1562 if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
1563 os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
1564 f_r0kh_id_len) != 0)
1565 return -1;
1566
1567 return 0;
1568 }
1569
1570
1571 static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
1572 const u8 *f_r1kh_id)
1573 {
1574 if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
1575 FT_R1KH_ID_LEN) != 0)
1576 return -1;
1577
1578 return 0;
1579 }
1580
1581
1582 static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
1583 {
1584 struct wpa_authenticator *wpa_auth = eloop_ctx;
1585 struct ft_remote_r0kh *r0kh, *prev = NULL;
1586
1587 if (!wpa_auth->conf.r0kh_list)
1588 return;
1589
1590 for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
1591 if (r0kh == timeout_ctx)
1592 break;
1593 prev = r0kh;
1594 }
1595 if (!r0kh)
1596 return;
1597 if (prev)
1598 prev->next = r0kh->next;
1599 else
1600 *wpa_auth->conf.r0kh_list = r0kh->next;
1601 if (r0kh->seq)
1602 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1603 os_free(r0kh->seq);
1604 os_free(r0kh);
1605 }
1606
1607
1608 static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
1609 struct ft_remote_r0kh *r0kh, int timeout)
1610 {
1611 if (timeout > 0)
1612 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1613 wpa_auth, r0kh);
1614 }
1615
1616
1617 static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
1618 struct ft_remote_r0kh *r0kh, int timeout)
1619 {
1620 eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);
1621
1622 if (timeout > 0)
1623 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1624 wpa_auth, r0kh);
1625 }
1626
1627
1628 static struct ft_remote_r0kh *
1629 wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
1630 struct ft_remote_r0kh *r0kh_wildcard,
1631 const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
1632 int timeout)
1633 {
1634 struct ft_remote_r0kh *r0kh;
1635
1636 if (!wpa_auth->conf.r0kh_list)
1637 return NULL;
1638
1639 r0kh = os_zalloc(sizeof(*r0kh));
1640 if (!r0kh)
1641 return NULL;
1642
1643 if (src_addr)
1644 os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));
1645
1646 if (id_len > FT_R0KH_ID_MAX_LEN)
1647 id_len = FT_R0KH_ID_MAX_LEN;
1648 os_memcpy(r0kh->id, r0kh_id, id_len);
1649 r0kh->id_len = id_len;
1650
1651 os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));
1652
1653 r0kh->next = *wpa_auth->conf.r0kh_list;
1654 *wpa_auth->conf.r0kh_list = r0kh;
1655
1656 if (timeout > 0)
1657 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1658 wpa_auth, r0kh);
1659
1660 if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
1661 return NULL;
1662
1663 return r0kh;
1664 }
1665
1666
1667 static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
1668 {
1669 struct wpa_authenticator *wpa_auth = eloop_ctx;
1670 struct ft_remote_r1kh *r1kh, *prev = NULL;
1671
1672 if (!wpa_auth->conf.r1kh_list)
1673 return;
1674
1675 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
1676 if (r1kh == timeout_ctx)
1677 break;
1678 prev = r1kh;
1679 }
1680 if (!r1kh)
1681 return;
1682 if (prev)
1683 prev->next = r1kh->next;
1684 else
1685 *wpa_auth->conf.r1kh_list = r1kh->next;
1686 if (r1kh->seq)
1687 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1688 os_free(r1kh->seq);
1689 os_free(r1kh);
1690 }
1691
1692
1693 static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
1694 struct ft_remote_r1kh *r1kh, int timeout)
1695 {
1696 if (timeout > 0)
1697 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1698 wpa_auth, r1kh);
1699 }
1700
1701
1702 static struct ft_remote_r1kh *
1703 wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
1704 struct ft_remote_r1kh *r1kh_wildcard,
1705 const u8 *src_addr, const u8 *r1kh_id, int timeout)
1706 {
1707 struct ft_remote_r1kh *r1kh;
1708
1709 if (!wpa_auth->conf.r1kh_list)
1710 return NULL;
1711
1712 r1kh = os_zalloc(sizeof(*r1kh));
1713 if (!r1kh)
1714 return NULL;
1715
1716 os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
1717 os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
1718 os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
1719 r1kh->next = *wpa_auth->conf.r1kh_list;
1720 *wpa_auth->conf.r1kh_list = r1kh;
1721
1722 if (timeout > 0)
1723 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1724 wpa_auth, r1kh);
1725
1726 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
1727 return NULL;
1728
1729 return r1kh;
1730 }
1731
1732
1733 void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
1734 {
1735 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1736 }
1737
1738
1739 static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
1740 {
1741 struct ft_remote_r0kh *r0kh;
1742 struct ft_remote_r1kh *r1kh;
1743
1744 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);
1745
1746 if (wpa_auth->conf.r0kh_list)
1747 r0kh = *wpa_auth->conf.r0kh_list;
1748 else
1749 r0kh = NULL;
1750 for (; r0kh; r0kh = r0kh->next) {
1751 if (!r0kh->seq)
1752 continue;
1753 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1754 os_free(r0kh->seq);
1755 r0kh->seq = NULL;
1756 }
1757
1758 if (wpa_auth->conf.r1kh_list)
1759 r1kh = *wpa_auth->conf.r1kh_list;
1760 else
1761 r1kh = NULL;
1762 for (; r1kh; r1kh = r1kh->next) {
1763 if (!r1kh->seq)
1764 continue;
1765 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1766 os_free(r1kh->seq);
1767 r1kh->seq = NULL;
1768 }
1769 }
1770
1771
1772 static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
1773 {
1774 struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
1775 struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;
1776
1777 if (wpa_auth->conf.r0kh_list)
1778 r0kh = *wpa_auth->conf.r0kh_list;
1779 else
1780 r0kh = NULL;
1781 while (r0kh) {
1782 r0kh_next = r0kh->next;
1783 if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
1784 r0kh) > 0) {
1785 if (r0kh_prev)
1786 r0kh_prev->next = r0kh_next;
1787 else
1788 *wpa_auth->conf.r0kh_list = r0kh_next;
1789 os_free(r0kh);
1790 } else {
1791 r0kh_prev = r0kh;
1792 }
1793 r0kh = r0kh_next;
1794 }
1795
1796 if (wpa_auth->conf.r1kh_list)
1797 r1kh = *wpa_auth->conf.r1kh_list;
1798 else
1799 r1kh = NULL;
1800 while (r1kh) {
1801 r1kh_next = r1kh->next;
1802 if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
1803 r1kh) > 0) {
1804 if (r1kh_prev)
1805 r1kh_prev->next = r1kh_next;
1806 else
1807 *wpa_auth->conf.r1kh_list = r1kh_next;
1808 os_free(r1kh);
1809 } else {
1810 r1kh_prev = r1kh;
1811 }
1812 r1kh = r1kh_next;
1813 }
1814 }
1815
1816
1817 void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
1818 {
1819 wpa_ft_deinit_seq(wpa_auth);
1820 wpa_ft_deinit_rkh_tmp(wpa_auth);
1821 }
1822
1823
1824 static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
1825 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1826 {
1827 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1828
1829 if (!wpa_auth->conf.rkh_neg_timeout)
1830 return;
1831
1832 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
1833 &r0kh, &r0kh_wildcard);
1834
1835 if (!r0kh_wildcard) {
1836 /* r0kh removed after neg_timeout and might need re-adding */
1837 return;
1838 }
1839
1840 wpa_hexdump(MSG_DEBUG, "FT: Blacklist R0KH-ID",
1841 f_r0kh_id, f_r0kh_id_len);
1842
1843 if (r0kh) {
1844 wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
1845 wpa_auth->conf.rkh_neg_timeout);
1846 os_memset(r0kh->addr, 0, ETH_ALEN);
1847 } else
1848 wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
1849 f_r0kh_id_len,
1850 wpa_auth->conf.rkh_neg_timeout);
1851 }
1852
1853
1854 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
1855 {
1856 struct wpa_state_machine *sm = eloop_ctx;
1857
1858 wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
1859 MAC2STR(sm->addr));
1860 if (sm->ft_pending_pull_left_retries <= 0)
1861 wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);
1862
1863 /* cancel multiple timeouts */
1864 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1865 ft_finish_pull(sm);
1866 }
1867
1868
1869 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
1870 const u8 *ies, size_t ies_len,
1871 const u8 *pmk_r0_name)
1872 {
1873 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1874 u8 *packet = NULL;
1875 const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
1876 size_t packet_len, key_len;
1877 struct ft_rrb_seq f_seq;
1878 int tsecs, tusecs, first;
1879 struct wpabuf *ft_pending_req_ies;
1880 int r0kh_timeout;
1881 struct tlv_list req_enc[] = {
1882 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
1883 .data = pmk_r0_name },
1884 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
1885 .data = sm->addr },
1886 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1887 };
1888 struct tlv_list req_auth[] = {
1889 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
1890 .data = sm->ft_pending_pull_nonce },
1891 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
1892 .data = (u8 *) &f_seq },
1893 { .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
1894 .data = sm->r0kh_id },
1895 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
1896 .data = f_r1kh_id },
1897 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1898 };
1899
1900 if (sm->ft_pending_pull_left_retries <= 0)
1901 return -1;
1902 first = sm->ft_pending_pull_left_retries ==
1903 sm->wpa_auth->conf.rkh_pull_retries;
1904 sm->ft_pending_pull_left_retries--;
1905
1906 wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
1907 &r0kh, &r0kh_wildcard);
1908
1909 /* Keep r0kh sufficiently long in the list for seq num check */
1910 r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
1911 1 + ftRRBseqTimeout;
1912 if (r0kh) {
1913 wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
1914 } else if (r0kh_wildcard) {
1915 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
1916 /* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
1917 r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
1918 r0kh_wildcard->addr,
1919 sm->r0kh_id, sm->r0kh_id_len,
1920 r0kh_timeout);
1921 }
1922 if (r0kh == NULL) {
1923 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
1924 sm->r0kh_id, sm->r0kh_id_len);
1925 return -1;
1926 }
1927 if (is_zero_ether_addr(r0kh->addr)) {
1928 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is blacklisted",
1929 sm->r0kh_id, sm->r0kh_id_len);
1930 return -1;
1931 }
1932 if (os_memcmp(r0kh->addr, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1933 wpa_printf(MSG_DEBUG,
1934 "FT: R0KH-ID points to self - no matching key available");
1935 return -1;
1936 }
1937
1938 key = r0kh->key;
1939 key_len = sizeof(r0kh->key);
1940
1941 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
1942 "address " MACSTR, MAC2STR(r0kh->addr));
1943
1944 if (r0kh->seq->rx.num_last == 0) {
1945 /* A sequence request will be sent out anyway when pull
1946 * response is received. Send it out now to avoid one RTT. */
1947 wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
1948 r0kh->id, r0kh->id_len, f_r1kh_id, key,
1949 key_len, NULL, 0, NULL, 0, NULL);
1950 }
1951
1952 if (first &&
1953 random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
1954 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
1955 "nonce");
1956 return -1;
1957 }
1958
1959 if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
1960 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
1961 return -1;
1962 }
1963
1964 if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth, NULL,
1965 sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
1966 &packet, &packet_len) < 0)
1967 return -1;
1968
1969 ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
1970 wpabuf_free(sm->ft_pending_req_ies);
1971 sm->ft_pending_req_ies = ft_pending_req_ies;
1972 if (!sm->ft_pending_req_ies) {
1973 os_free(packet);
1974 return -1;
1975 }
1976
1977 tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
1978 tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
1979 eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);
1980
1981 wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
1982 packet, packet_len);
1983
1984 os_free(packet);
1985
1986 return 0;
1987 }
1988
1989
1990 int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
1991 const u8 *pmk_r0, const u8 *pmk_r0_name)
1992 {
1993 int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
1994 struct vlan_description vlan;
1995 const u8 *identity, *radius_cui;
1996 size_t identity_len, radius_cui_len;
1997 int session_timeout;
1998 size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
1999 SHA384_MAC_LEN : PMK_LEN;
2000
2001 if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2002 wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
2003 MAC2STR(sm->addr));
2004 return -1;
2005 }
2006
2007 identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
2008 radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
2009 &radius_cui);
2010 session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
2011
2012 return wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
2013 pmk_r0_name, sm->pairwise, &vlan, expires_in,
2014 session_timeout, identity, identity_len,
2015 radius_cui, radius_cui_len);
2016 }
2017
2018
2019 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
2020 struct wpa_ptk *ptk)
2021 {
2022 u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
2023 size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
2024 SHA384_MAC_LEN : PMK_LEN;
2025 size_t pmk_r1_len = pmk_r0_len;
2026 u8 pmk_r1[PMK_LEN_MAX];
2027 u8 ptk_name[WPA_PMK_NAME_LEN];
2028 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
2029 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
2030 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
2031 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
2032 const u8 *ssid = sm->wpa_auth->conf.ssid;
2033 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
2034 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
2035 int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
2036 struct vlan_description vlan;
2037 const u8 *identity, *radius_cui;
2038 size_t identity_len, radius_cui_len;
2039 int session_timeout;
2040
2041 if (sm->xxkey_len == 0) {
2042 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
2043 "derivation");
2044 return -1;
2045 }
2046
2047 if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2048 wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
2049 MAC2STR(sm->addr));
2050 return -1;
2051 }
2052
2053 identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
2054 radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
2055 &radius_cui);
2056 session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
2057
2058 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
2059 r0kh, r0kh_len, sm->addr,
2060 pmk_r0, pmk_r0_name,
2061 wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) < 0)
2062 return -1;
2063 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, pmk_r0_len);
2064 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
2065 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
2066 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
2067 pmk_r0_name,
2068 sm->pairwise, &vlan, expires_in,
2069 session_timeout, identity, identity_len,
2070 radius_cui, radius_cui_len);
2071
2072 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_len, pmk_r0_name, r1kh, sm->addr,
2073 pmk_r1, sm->pmk_r1_name) < 0)
2074 return -1;
2075 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, pmk_r1_len);
2076 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
2077 WPA_PMK_NAME_LEN);
2078 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
2079 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_len,
2080 sm->pmk_r1_name, sm->pairwise, &vlan,
2081 expires_in, session_timeout, identity,
2082 identity_len, radius_cui, radius_cui_len);
2083
2084 return wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
2085 sm->addr, sm->wpa_auth->addr, sm->pmk_r1_name,
2086 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
2087 }
2088
2089
2090 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
2091 const u8 *addr, int idx, u8 *seq)
2092 {
2093 if (wpa_auth->cb->get_seqnum == NULL)
2094 return -1;
2095 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
2096 }
2097
2098
2099 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
2100 {
2101 u8 *subelem;
2102 struct wpa_group *gsm = sm->group;
2103 size_t subelem_len, pad_len;
2104 const u8 *key;
2105 size_t key_len;
2106 u8 keybuf[32];
2107 const u8 *kek;
2108 size_t kek_len;
2109
2110 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2111 kek = sm->PTK.kek2;
2112 kek_len = sm->PTK.kek2_len;
2113 } else {
2114 kek = sm->PTK.kek;
2115 kek_len = sm->PTK.kek_len;
2116 }
2117
2118 key_len = gsm->GTK_len;
2119 if (key_len > sizeof(keybuf))
2120 return NULL;
2121
2122 /*
2123 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
2124 * than 16 bytes.
2125 */
2126 pad_len = key_len % 8;
2127 if (pad_len)
2128 pad_len = 8 - pad_len;
2129 if (key_len + pad_len < 16)
2130 pad_len += 8;
2131 if (pad_len && key_len < sizeof(keybuf)) {
2132 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
2133 os_memset(keybuf + key_len, 0, pad_len);
2134 keybuf[key_len] = 0xdd;
2135 key_len += pad_len;
2136 key = keybuf;
2137 } else
2138 key = gsm->GTK[gsm->GN - 1];
2139
2140 /*
2141 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2142 * Key[5..32].
2143 */
2144 subelem_len = 13 + key_len + 8;
2145 subelem = os_zalloc(subelem_len);
2146 if (subelem == NULL)
2147 return NULL;
2148
2149 subelem[0] = FTIE_SUBELEM_GTK;
2150 subelem[1] = 11 + key_len + 8;
2151 /* Key ID in B0-B1 of Key Info */
2152 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
2153 subelem[4] = gsm->GTK_len;
2154 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
2155 if (aes_wrap(kek, kek_len, key_len / 8, key, subelem + 13)) {
2156 wpa_printf(MSG_DEBUG,
2157 "FT: GTK subelem encryption failed: kek_len=%d",
2158 (int) kek_len);
2159 os_free(subelem);
2160 return NULL;
2161 }
2162
2163 *len = subelem_len;
2164 return subelem;
2165 }
2166
2167
2168 #ifdef CONFIG_IEEE80211W
2169 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
2170 {
2171 u8 *subelem, *pos;
2172 struct wpa_group *gsm = sm->group;
2173 size_t subelem_len;
2174 const u8 *kek;
2175 size_t kek_len;
2176
2177 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2178 kek = sm->PTK.kek2;
2179 kek_len = sm->PTK.kek2_len;
2180 } else {
2181 kek = sm->PTK.kek;
2182 kek_len = sm->PTK.kek_len;
2183 }
2184
2185 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
2186 * Key[16+8] */
2187 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
2188 subelem = os_zalloc(subelem_len);
2189 if (subelem == NULL)
2190 return NULL;
2191
2192 pos = subelem;
2193 *pos++ = FTIE_SUBELEM_IGTK;
2194 *pos++ = subelem_len - 2;
2195 WPA_PUT_LE16(pos, gsm->GN_igtk);
2196 pos += 2;
2197 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
2198 pos += 6;
2199 *pos++ = WPA_IGTK_LEN;
2200 if (aes_wrap(kek, kek_len, WPA_IGTK_LEN / 8,
2201 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
2202 wpa_printf(MSG_DEBUG,
2203 "FT: IGTK subelem encryption failed: kek_len=%d",
2204 (int) kek_len);
2205 os_free(subelem);
2206 return NULL;
2207 }
2208
2209 *len = subelem_len;
2210 return subelem;
2211 }
2212 #endif /* CONFIG_IEEE80211W */
2213
2214
2215 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
2216 u8 *pos, u8 *end, u8 id, u8 descr_count,
2217 const u8 *ies, size_t ies_len)
2218 {
2219 struct ieee802_11_elems parse;
2220 struct rsn_rdie *rdie;
2221
2222 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
2223 id, descr_count);
2224 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
2225 ies, ies_len);
2226
2227 if (end - pos < (int) sizeof(*rdie)) {
2228 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
2229 return pos;
2230 }
2231
2232 *pos++ = WLAN_EID_RIC_DATA;
2233 *pos++ = sizeof(*rdie);
2234 rdie = (struct rsn_rdie *) pos;
2235 rdie->id = id;
2236 rdie->descr_count = 0;
2237 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
2238 pos += sizeof(*rdie);
2239
2240 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
2241 ParseFailed) {
2242 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
2243 rdie->status_code =
2244 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2245 return pos;
2246 }
2247
2248 if (parse.wmm_tspec) {
2249 struct wmm_tspec_element *tspec;
2250
2251 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
2252 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
2253 "(%d)", (int) parse.wmm_tspec_len);
2254 rdie->status_code =
2255 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2256 return pos;
2257 }
2258 if (end - pos < (int) sizeof(*tspec)) {
2259 wpa_printf(MSG_ERROR, "FT: Not enough room for "
2260 "response TSPEC");
2261 rdie->status_code =
2262 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2263 return pos;
2264 }
2265 tspec = (struct wmm_tspec_element *) pos;
2266 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
2267 }
2268
2269 #ifdef NEED_AP_MLME
2270 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
2271 int res;
2272
2273 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
2274 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
2275 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
2276 rdie->status_code =
2277 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
2278 else if (res == WMM_ADDTS_STATUS_REFUSED)
2279 rdie->status_code =
2280 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
2281 else {
2282 /* TSPEC accepted; include updated TSPEC in response */
2283 rdie->descr_count = 1;
2284 pos += sizeof(struct wmm_tspec_element);
2285 }
2286 return pos;
2287 }
2288 #endif /* NEED_AP_MLME */
2289
2290 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
2291 int res;
2292
2293 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
2294 sizeof(struct wmm_tspec_element));
2295 if (res >= 0) {
2296 if (res)
2297 rdie->status_code = host_to_le16(res);
2298 else {
2299 /* TSPEC accepted; include updated TSPEC in
2300 * response */
2301 rdie->descr_count = 1;
2302 pos += sizeof(struct wmm_tspec_element);
2303 }
2304 return pos;
2305 }
2306 }
2307
2308 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
2309 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2310 return pos;
2311 }
2312
2313
2314 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
2315 const u8 *ric, size_t ric_len)
2316 {
2317 const u8 *rpos, *start;
2318 const struct rsn_rdie *rdie;
2319
2320 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
2321
2322 rpos = ric;
2323 while (rpos + sizeof(*rdie) < ric + ric_len) {
2324 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
2325 rpos + 2 + rpos[1] > ric + ric_len)
2326 break;
2327 rdie = (const struct rsn_rdie *) (rpos + 2);
2328 rpos += 2 + rpos[1];
2329 start = rpos;
2330
2331 while (rpos + 2 <= ric + ric_len &&
2332 rpos + 2 + rpos[1] <= ric + ric_len) {
2333 if (rpos[0] == WLAN_EID_RIC_DATA)
2334 break;
2335 rpos += 2 + rpos[1];
2336 }
2337 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
2338 rdie->descr_count,
2339 start, rpos - start);
2340 }
2341
2342 return pos;
2343 }
2344
2345
2346 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
2347 size_t max_len, int auth_alg,
2348 const u8 *req_ies, size_t req_ies_len)
2349 {
2350 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
2351 u8 *fte_mic, *elem_count;
2352 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
2353 int res;
2354 struct wpa_auth_config *conf;
2355 struct wpa_ft_ies parse;
2356 u8 *ric_start;
2357 u8 *anonce, *snonce;
2358 const u8 *kck;
2359 size_t kck_len;
2360 int use_sha384;
2361
2362 if (sm == NULL)
2363 return pos;
2364
2365 use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
2366 conf = &sm->wpa_auth->conf;
2367
2368 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2369 return pos;
2370
2371 end = pos + max_len;
2372
2373 if (auth_alg == WLAN_AUTH_FT) {
2374 /*
2375 * RSN (only present if this is a Reassociation Response and
2376 * part of a fast BSS transition)
2377 */
2378 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
2379 if (res < 0)
2380 return NULL;
2381 rsnie = pos;
2382 rsnie_len = res;
2383 pos += res;
2384 }
2385
2386 /* Mobility Domain Information */
2387 res = wpa_write_mdie(conf, pos, end - pos);
2388 if (res < 0)
2389 return NULL;
2390 mdie = pos;
2391 mdie_len = res;
2392 pos += res;
2393
2394 /* Fast BSS Transition Information */
2395 if (auth_alg == WLAN_AUTH_FT) {
2396 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
2397 if (!subelem) {
2398 wpa_printf(MSG_DEBUG,
2399 "FT: Failed to add GTK subelement");
2400 return NULL;
2401 }
2402 r0kh_id = sm->r0kh_id;
2403 r0kh_id_len = sm->r0kh_id_len;
2404 anonce = sm->ANonce;
2405 snonce = sm->SNonce;
2406 #ifdef CONFIG_IEEE80211W
2407 if (sm->mgmt_frame_prot) {
2408 u8 *igtk;
2409 size_t igtk_len;
2410 u8 *nbuf;
2411 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
2412 if (igtk == NULL) {
2413 wpa_printf(MSG_DEBUG,
2414 "FT: Failed to add IGTK subelement");
2415 os_free(subelem);
2416 return NULL;
2417 }
2418 nbuf = os_realloc(subelem, subelem_len + igtk_len);
2419 if (nbuf == NULL) {
2420 os_free(subelem);
2421 os_free(igtk);
2422 return NULL;
2423 }
2424 subelem = nbuf;
2425 os_memcpy(subelem + subelem_len, igtk, igtk_len);
2426 subelem_len += igtk_len;
2427 os_free(igtk);
2428 }
2429 #endif /* CONFIG_IEEE80211W */
2430 } else {
2431 r0kh_id = conf->r0_key_holder;
2432 r0kh_id_len = conf->r0_key_holder_len;
2433 anonce = NULL;
2434 snonce = NULL;
2435 }
2436 res = wpa_write_ftie(conf, use_sha384, r0kh_id, r0kh_id_len,
2437 anonce, snonce, pos, end - pos,
2438 subelem, subelem_len);
2439 os_free(subelem);
2440 if (res < 0)
2441 return NULL;
2442 ftie = pos;
2443 ftie_len = res;
2444 pos += res;
2445
2446 if (use_sha384) {
2447 struct rsn_ftie_sha384 *_ftie =
2448 (struct rsn_ftie_sha384 *) (ftie + 2);
2449
2450 fte_mic = _ftie->mic;
2451 elem_count = &_ftie->mic_control[1];
2452 } else {
2453 struct rsn_ftie *_ftie = (struct rsn_ftie *) (ftie + 2);
2454
2455 fte_mic = _ftie->mic;
2456 elem_count = &_ftie->mic_control[1];
2457 }
2458 if (auth_alg == WLAN_AUTH_FT)
2459 *elem_count = 3; /* Information element count */
2460
2461 ric_start = pos;
2462 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse, use_sha384) == 0
2463 && parse.ric) {
2464 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
2465 parse.ric_len);
2466 if (auth_alg == WLAN_AUTH_FT)
2467 *elem_count +=
2468 ieee802_11_ie_count(ric_start,
2469 pos - ric_start);
2470 }
2471 if (ric_start == pos)
2472 ric_start = NULL;
2473
2474 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2475 kck = sm->PTK.kck2;
2476 kck_len = sm->PTK.kck2_len;
2477 } else {
2478 kck = sm->PTK.kck;
2479 kck_len = sm->PTK.kck_len;
2480 }
2481 if (auth_alg == WLAN_AUTH_FT &&
2482 wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 6,
2483 mdie, mdie_len, ftie, ftie_len,
2484 rsnie, rsnie_len,
2485 ric_start, ric_start ? pos - ric_start : 0,
2486 fte_mic) < 0) {
2487 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
2488 return NULL;
2489 }
2490
2491 os_free(sm->assoc_resp_ftie);
2492 sm->assoc_resp_ftie = os_malloc(ftie_len);
2493 if (!sm->assoc_resp_ftie)
2494 return NULL;
2495 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
2496
2497 return pos;
2498 }
2499
2500
2501 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
2502 int vlan_id,
2503 enum wpa_alg alg, const u8 *addr, int idx,
2504 u8 *key, size_t key_len)
2505 {
2506 if (wpa_auth->cb->set_key == NULL)
2507 return -1;
2508 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
2509 key, key_len);
2510 }
2511
2512
2513 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
2514 {
2515 enum wpa_alg alg;
2516 int klen;
2517
2518 /* MLME-SETKEYS.request(PTK) */
2519 alg = wpa_cipher_to_alg(sm->pairwise);
2520 klen = wpa_cipher_key_len(sm->pairwise);
2521 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
2522 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
2523 "PTK configuration", sm->pairwise);
2524 return;
2525 }
2526
2527 if (sm->tk_already_set) {
2528 /* Must avoid TK reconfiguration to prevent clearing of TX/RX
2529 * PN in the driver */
2530 wpa_printf(MSG_DEBUG,
2531 "FT: Do not re-install same PTK to the driver");
2532 return;
2533 }
2534
2535 /* FIX: add STA entry to kernel/driver here? The set_key will fail
2536 * most likely without this.. At the moment, STA entry is added only
2537 * after association has been completed. This function will be called
2538 * again after association to get the PTK configured, but that could be
2539 * optimized by adding the STA entry earlier.
2540 */
2541 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2542 sm->PTK.tk, klen))
2543 return;
2544
2545 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2546 sm->pairwise_set = TRUE;
2547 sm->tk_already_set = TRUE;
2548 }
2549
2550
2551 /* Derive PMK-R1 from PSK, check all available PSK */
2552 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
2553 const u8 *req_pmk_r1_name,
2554 u8 *out_pmk_r1, int *out_pairwise,
2555 struct vlan_description *out_vlan,
2556 const u8 **out_identity, size_t *out_identity_len,
2557 const u8 **out_radius_cui,
2558 size_t *out_radius_cui_len,
2559 int *out_session_timeout)
2560 {
2561 const u8 *pmk = NULL;
2562 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
2563 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
2564 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2565 const u8 *mdid = wpa_auth->conf.mobility_domain;
2566 const u8 *r0kh = sm->r0kh_id;
2567 size_t r0kh_len = sm->r0kh_id_len;
2568 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
2569 const u8 *ssid = wpa_auth->conf.ssid;
2570 size_t ssid_len = wpa_auth->conf.ssid_len;
2571 int pairwise;
2572
2573 pairwise = sm->pairwise;
2574
2575 for (;;) {
2576 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
2577 pmk);
2578 if (pmk == NULL)
2579 break;
2580
2581 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
2582 r0kh_len, sm->addr,
2583 pmk_r0, pmk_r0_name, 0) < 0 ||
2584 wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh,
2585 sm->addr, pmk_r1, pmk_r1_name) < 0 ||
2586 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
2587 WPA_PMK_NAME_LEN) != 0)
2588 continue;
2589
2590 /* We found a PSK that matches the requested pmk_r1_name */
2591 wpa_printf(MSG_DEBUG,
2592 "FT: Found PSK to generate PMK-R1 locally");
2593 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
2594 if (out_pairwise)
2595 *out_pairwise = pairwise;
2596 if (out_vlan &&
2597 wpa_ft_get_vlan(sm->wpa_auth, sm->addr, out_vlan) < 0) {
2598 wpa_printf(MSG_DEBUG, "FT: vlan not available for STA "
2599 MACSTR, MAC2STR(sm->addr));
2600 return -1;
2601 }
2602
2603 if (out_identity && out_identity_len) {
2604 *out_identity_len = wpa_ft_get_identity(
2605 sm->wpa_auth, sm->addr, out_identity);
2606 }
2607
2608 if (out_radius_cui && out_radius_cui_len) {
2609 *out_radius_cui_len = wpa_ft_get_radius_cui(
2610 sm->wpa_auth, sm->addr, out_radius_cui);
2611 }
2612
2613 if (out_session_timeout) {
2614 *out_session_timeout = wpa_ft_get_session_timeout(
2615 sm->wpa_auth, sm->addr);
2616 }
2617
2618 return 0;
2619 }
2620
2621 wpa_printf(MSG_DEBUG,
2622 "FT: Did not find PSK to generate PMK-R1 locally");
2623 return -1;
2624 }
2625
2626
2627 /* Detect the configuration the station asked for.
2628 * Required to detect FT-PSK and pairwise cipher.
2629 */
2630 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
2631 struct wpa_ft_ies *parse)
2632 {
2633 int key_mgmt, ciphers;
2634
2635 if (sm->wpa_key_mgmt)
2636 return 0;
2637
2638 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
2639 if (!key_mgmt) {
2640 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
2641 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
2642 return -1;
2643 }
2644 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
2645 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
2646 #ifdef CONFIG_SHA384
2647 else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
2648 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384;
2649 #endif /* CONFIG_SHA384 */
2650 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
2651 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
2652 #ifdef CONFIG_FILS
2653 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
2654 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
2655 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
2656 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
2657 #endif /* CONFIG_FILS */
2658 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
2659 if (!ciphers) {
2660 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
2661 MACSTR,
2662 parse->pairwise_cipher, MAC2STR(sm->addr));
2663 return -1;
2664 }
2665 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
2666
2667 return 0;
2668 }
2669
2670
2671 static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
2672 struct wpa_state_machine *sm,
2673 const u8 *r0kh_id, size_t r0kh_id_len,
2674 const u8 *req_pmk_r0_name,
2675 const u8 *req_pmk_r1_name,
2676 u8 *out_pmk_r1, int *out_pairwise,
2677 struct vlan_description *vlan,
2678 const u8 **identity, size_t *identity_len,
2679 const u8 **radius_cui,
2680 size_t *radius_cui_len,
2681 int *out_session_timeout)
2682 {
2683 struct wpa_auth_config *conf = &wpa_auth->conf;
2684 const struct wpa_ft_pmk_r0_sa *r0;
2685 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
2686 int expires_in = 0;
2687 int session_timeout = 0;
2688 struct os_reltime now;
2689
2690 if (conf->r0_key_holder_len != r0kh_id_len ||
2691 os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) !=
2692 0)
2693 return -1; /* not our R0KH-ID */
2694
2695 wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration");
2696 if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) <
2697 0)
2698 return -1; /* no matching PMKR0Name in local cache */
2699
2700 wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache");
2701
2702 if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_len, r0->pmk_r0_name,
2703 conf->r1_key_holder,
2704 sm->addr, out_pmk_r1, pmk_r1_name) < 0)
2705 return -1;
2706 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", out_pmk_r1, r0->pmk_r0_len);
2707 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
2708
2709 os_get_reltime(&now);
2710 if (r0->expiration)
2711 expires_in = r0->expiration - now.sec;
2712
2713 if (r0->session_timeout)
2714 session_timeout = r0->session_timeout - now.sec;
2715
2716 wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, r0->pmk_r0_len,
2717 pmk_r1_name,
2718 sm->pairwise, r0->vlan, expires_in, session_timeout,
2719 r0->identity, r0->identity_len,
2720 r0->radius_cui, r0->radius_cui_len);
2721
2722 *out_pairwise = sm->pairwise;
2723 if (vlan) {
2724 if (r0->vlan)
2725 *vlan = *r0->vlan;
2726 else
2727 os_memset(vlan, 0, sizeof(*vlan));
2728 }
2729
2730 if (identity && identity_len) {
2731 *identity = r0->identity;
2732 *identity_len = r0->identity_len;
2733 }
2734
2735 if (radius_cui && radius_cui_len) {
2736 *radius_cui = r0->radius_cui;
2737 *radius_cui_len = r0->radius_cui_len;
2738 }
2739
2740 *out_session_timeout = session_timeout;
2741
2742 return 0;
2743 }
2744
2745
2746 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
2747 const u8 *ies, size_t ies_len,
2748 u8 **resp_ies, size_t *resp_ies_len)
2749 {
2750 struct rsn_mdie *mdie;
2751 u8 pmk_r1[PMK_LEN_MAX], pmk_r1_name[WPA_PMK_NAME_LEN];
2752 u8 ptk_name[WPA_PMK_NAME_LEN];
2753 struct wpa_auth_config *conf;
2754 struct wpa_ft_ies parse;
2755 size_t buflen;
2756 int ret;
2757 u8 *pos, *end;
2758 int pairwise, session_timeout = 0;
2759 struct vlan_description vlan;
2760 const u8 *identity, *radius_cui;
2761 size_t identity_len = 0, radius_cui_len = 0;
2762 int use_sha384;
2763 size_t pmk_r1_len;
2764
2765 *resp_ies = NULL;
2766 *resp_ies_len = 0;
2767
2768 sm->pmk_r1_name_valid = 0;
2769 conf = &sm->wpa_auth->conf;
2770
2771 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
2772 ies, ies_len);
2773
2774 if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) {
2775 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
2776 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2777 }
2778 use_sha384 = wpa_key_mgmt_sha384(parse.key_mgmt);
2779 pmk_r1_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
2780
2781 mdie = (struct rsn_mdie *) parse.mdie;
2782 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
2783 os_memcmp(mdie->mobility_domain,
2784 sm->wpa_auth->conf.mobility_domain,
2785 MOBILITY_DOMAIN_ID_LEN) != 0) {
2786 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
2787 return WLAN_STATUS_INVALID_MDIE;
2788 }
2789
2790 if (use_sha384) {
2791 struct rsn_ftie_sha384 *ftie;
2792
2793 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
2794 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
2795 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2796 return WLAN_STATUS_INVALID_FTIE;
2797 }
2798
2799 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
2800 } else {
2801 struct rsn_ftie *ftie;
2802
2803 ftie = (struct rsn_ftie *) parse.ftie;
2804 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
2805 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2806 return WLAN_STATUS_INVALID_FTIE;
2807 }
2808
2809 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
2810 }
2811
2812 if (parse.r0kh_id == NULL) {
2813 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
2814 return WLAN_STATUS_INVALID_FTIE;
2815 }
2816
2817 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
2818 parse.r0kh_id, parse.r0kh_id_len);
2819 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
2820 sm->r0kh_id_len = parse.r0kh_id_len;
2821
2822 if (parse.rsn_pmkid == NULL) {
2823 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
2824 return WLAN_STATUS_INVALID_PMKID;
2825 }
2826
2827 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
2828 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2829
2830 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
2831 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
2832 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
2833 sm->wpa_auth->conf.r1_key_holder, sm->addr,
2834 pmk_r1_name) < 0)
2835 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2836 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
2837 pmk_r1_name, WPA_PMK_NAME_LEN);
2838
2839 if (conf->ft_psk_generate_local &&
2840 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
2841 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise,
2842 &vlan, &identity, &identity_len,
2843 &radius_cui, &radius_cui_len,
2844 &session_timeout) < 0)
2845 return WLAN_STATUS_INVALID_PMKID;
2846 wpa_printf(MSG_DEBUG,
2847 "FT: Generated PMK-R1 for FT-PSK locally");
2848 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
2849 pmk_r1, &pmk_r1_len, &pairwise, &vlan,
2850 &identity, &identity_len, &radius_cui,
2851 &radius_cui_len, &session_timeout) < 0) {
2852 wpa_printf(MSG_DEBUG,
2853 "FT: No PMK-R1 available in local cache for the requested PMKR1Name");
2854 if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm,
2855 parse.r0kh_id, parse.r0kh_id_len,
2856 parse.rsn_pmkid,
2857 pmk_r1_name, pmk_r1, &pairwise,
2858 &vlan, &identity, &identity_len,
2859 &radius_cui, &radius_cui_len,
2860 &session_timeout) == 0) {
2861 wpa_printf(MSG_DEBUG,
2862 "FT: Generated PMK-R1 based on local PMK-R0");
2863 goto pmk_r1_derived;
2864 }
2865
2866 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
2867 wpa_printf(MSG_DEBUG,
2868 "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
2869 return WLAN_STATUS_INVALID_PMKID;
2870 }
2871
2872 return -1; /* Status pending */
2873 } else {
2874 wpa_printf(MSG_DEBUG, "FT: Found PMKR1Name from local cache");
2875 }
2876
2877 pmk_r1_derived:
2878 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, pmk_r1_len);
2879 sm->pmk_r1_name_valid = 1;
2880 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
2881
2882 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
2883 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
2884 "ANonce");
2885 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2886 }
2887
2888 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
2889 sm->SNonce, WPA_NONCE_LEN);
2890 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
2891 sm->ANonce, WPA_NONCE_LEN);
2892
2893 if (wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
2894 sm->addr, sm->wpa_auth->addr, pmk_r1_name,
2895 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
2896 pairwise) < 0)
2897 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2898
2899 sm->pairwise = pairwise;
2900 sm->PTK_valid = TRUE;
2901 sm->tk_already_set = FALSE;
2902 wpa_ft_install_ptk(sm);
2903
2904 if (wpa_ft_set_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2905 wpa_printf(MSG_DEBUG, "FT: Failed to configure VLAN");
2906 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2907 }
2908 if (wpa_ft_set_identity(sm->wpa_auth, sm->addr,
2909 identity, identity_len) < 0 ||
2910 wpa_ft_set_radius_cui(sm->wpa_auth, sm->addr,
2911 radius_cui, radius_cui_len) < 0) {
2912 wpa_printf(MSG_DEBUG, "FT: Failed to configure identity/CUI");
2913 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2914 }
2915 wpa_ft_set_session_timeout(sm->wpa_auth, sm->addr, session_timeout);
2916
2917 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
2918 2 + FT_R1KH_ID_LEN + 200;
2919 *resp_ies = os_zalloc(buflen);
2920 if (*resp_ies == NULL)
2921 goto fail;
2922
2923 pos = *resp_ies;
2924 end = *resp_ies + buflen;
2925
2926 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
2927 if (ret < 0)
2928 goto fail;
2929 pos += ret;
2930
2931 ret = wpa_write_mdie(conf, pos, end - pos);
2932 if (ret < 0)
2933 goto fail;
2934 pos += ret;
2935
2936 ret = wpa_write_ftie(conf, use_sha384, parse.r0kh_id, parse.r0kh_id_len,
2937 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
2938 if (ret < 0)
2939 goto fail;
2940 pos += ret;
2941
2942 *resp_ies_len = pos - *resp_ies;
2943
2944 return WLAN_STATUS_SUCCESS;
2945 fail:
2946 os_free(*resp_ies);
2947 *resp_ies = NULL;
2948 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2949 }
2950
2951
2952 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
2953 u16 auth_transaction, const u8 *ies, size_t ies_len,
2954 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
2955 u16 auth_transaction, u16 status,
2956 const u8 *ies, size_t ies_len),
2957 void *ctx)
2958 {
2959 u16 status;
2960 u8 *resp_ies;
2961 size_t resp_ies_len;
2962 int res;
2963
2964 if (sm == NULL) {
2965 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
2966 "WPA SM not available");
2967 return;
2968 }
2969
2970 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
2971 " BSSID=" MACSTR " transaction=%d",
2972 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
2973 sm->ft_pending_cb = cb;
2974 sm->ft_pending_cb_ctx = ctx;
2975 sm->ft_pending_auth_transaction = auth_transaction;
2976 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
2977 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
2978 &resp_ies_len);
2979 if (res < 0) {
2980 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
2981 return;
2982 }
2983 status = res;
2984
2985 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
2986 " auth_transaction=%d status=%d",
2987 MAC2STR(sm->addr), auth_transaction + 1, status);
2988 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
2989 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
2990 resp_ies, resp_ies_len);
2991 os_free(resp_ies);
2992 }
2993
2994
2995 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
2996 size_t ies_len)
2997 {
2998 struct wpa_ft_ies parse;
2999 struct rsn_mdie *mdie;
3000 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
3001 size_t mic_len = 16;
3002 unsigned int count;
3003 const u8 *kck;
3004 size_t kck_len;
3005 int use_sha384;
3006 const u8 *anonce, *snonce, *fte_mic;
3007 u8 fte_elem_count;
3008
3009 if (sm == NULL)
3010 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3011
3012 use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
3013
3014 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
3015
3016 if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
3017 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
3018 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3019 }
3020
3021 if (parse.rsn == NULL) {
3022 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
3023 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3024 }
3025
3026 if (parse.rsn_pmkid == NULL) {
3027 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
3028 return WLAN_STATUS_INVALID_PMKID;
3029 }
3030
3031 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
3032 != 0) {
3033 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
3034 "with the PMKR1Name derived from auth request");
3035 return WLAN_STATUS_INVALID_PMKID;
3036 }
3037
3038 mdie = (struct rsn_mdie *) parse.mdie;
3039 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
3040 os_memcmp(mdie->mobility_domain,
3041 sm->wpa_auth->conf.mobility_domain,
3042 MOBILITY_DOMAIN_ID_LEN) != 0) {
3043 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
3044 return WLAN_STATUS_INVALID_MDIE;
3045 }
3046
3047 if (use_sha384) {
3048 struct rsn_ftie_sha384 *ftie;
3049
3050 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
3051 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
3052 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3053 return WLAN_STATUS_INVALID_FTIE;
3054 }
3055
3056 anonce = ftie->anonce;
3057 snonce = ftie->snonce;
3058 fte_elem_count = ftie->mic_control[1];
3059 fte_mic = ftie->mic;
3060 } else {
3061 struct rsn_ftie *ftie;
3062
3063 ftie = (struct rsn_ftie *) parse.ftie;
3064 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
3065 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3066 return WLAN_STATUS_INVALID_FTIE;
3067 }
3068
3069 anonce = ftie->anonce;
3070 snonce = ftie->snonce;
3071 fte_elem_count = ftie->mic_control[1];
3072 fte_mic = ftie->mic;
3073 }
3074
3075 if (os_memcmp(snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
3076 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
3077 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
3078 snonce, WPA_NONCE_LEN);
3079 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
3080 sm->SNonce, WPA_NONCE_LEN);
3081 return WLAN_STATUS_INVALID_FTIE;
3082 }
3083
3084 if (os_memcmp(anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
3085 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
3086 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
3087 anonce, WPA_NONCE_LEN);
3088 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
3089 sm->ANonce, WPA_NONCE_LEN);
3090 return WLAN_STATUS_INVALID_FTIE;
3091 }
3092
3093
3094 if (parse.r0kh_id == NULL) {
3095 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
3096 return WLAN_STATUS_INVALID_FTIE;
3097 }
3098
3099 if (parse.r0kh_id_len != sm->r0kh_id_len ||
3100 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
3101 {
3102 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
3103 "the current R0KH-ID");
3104 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
3105 parse.r0kh_id, parse.r0kh_id_len);
3106 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
3107 sm->r0kh_id, sm->r0kh_id_len);
3108 return WLAN_STATUS_INVALID_FTIE;
3109 }
3110
3111 if (parse.r1kh_id == NULL) {
3112 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
3113 return WLAN_STATUS_INVALID_FTIE;
3114 }
3115
3116 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
3117 FT_R1KH_ID_LEN) != 0) {
3118 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
3119 "ReassocReq");
3120 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
3121 parse.r1kh_id, FT_R1KH_ID_LEN);
3122 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
3123 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
3124 return WLAN_STATUS_INVALID_FTIE;
3125 }
3126
3127 if (parse.rsn_pmkid == NULL ||
3128 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
3129 {
3130 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
3131 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
3132 return WLAN_STATUS_INVALID_PMKID;
3133 }
3134
3135 count = 3;
3136 if (parse.ric)
3137 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
3138 if (fte_elem_count != count) {
3139 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
3140 "Control: received %u expected %u",
3141 fte_elem_count, count);
3142 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3143 }
3144
3145 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
3146 kck = sm->PTK.kck2;
3147 kck_len = sm->PTK.kck2_len;
3148 } else {
3149 kck = sm->PTK.kck;
3150 kck_len = sm->PTK.kck_len;
3151 }
3152 if (wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 5,
3153 parse.mdie - 2, parse.mdie_len + 2,
3154 parse.ftie - 2, parse.ftie_len + 2,
3155 parse.rsn - 2, parse.rsn_len + 2,
3156 parse.ric, parse.ric_len,
3157 mic) < 0) {
3158 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
3159 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3160 }
3161
3162 if (os_memcmp_const(mic, fte_mic, mic_len) != 0) {
3163 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
3164 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
3165 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
3166 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
3167 fte_mic, mic_len);
3168 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
3169 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
3170 parse.mdie - 2, parse.mdie_len + 2);
3171 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
3172 parse.ftie - 2, parse.ftie_len + 2);
3173 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
3174 parse.rsn - 2, parse.rsn_len + 2);
3175 return WLAN_STATUS_INVALID_FTIE;
3176 }
3177
3178 return WLAN_STATUS_SUCCESS;
3179 }
3180
3181
3182 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
3183 {
3184 const u8 *sta_addr, *target_ap;
3185 const u8 *ies;
3186 size_t ies_len;
3187 u8 action;
3188 struct ft_rrb_frame *frame;
3189
3190 if (sm == NULL)
3191 return -1;
3192
3193 /*
3194 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
3195 * FT Request action frame body[variable]
3196 */
3197
3198 if (len < 14) {
3199 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
3200 "(len=%lu)", (unsigned long) len);
3201 return -1;
3202 }
3203
3204 action = data[1];
3205 sta_addr = data + 2;
3206 target_ap = data + 8;
3207 ies = data + 14;
3208 ies_len = len - 14;
3209
3210 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
3211 " Target AP=" MACSTR " Action=%d)",
3212 MAC2STR(sta_addr), MAC2STR(target_ap), action);
3213
3214 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
3215 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
3216 "STA=" MACSTR " STA-Address=" MACSTR,
3217 MAC2STR(sm->addr), MAC2STR(sta_addr));
3218 return -1;
3219 }
3220
3221 /*
3222 * Do some sanity checking on the target AP address (not own and not
3223 * broadcast. This could be extended to filter based on a list of known
3224 * APs in the MD (if such a list were configured).
3225 */
3226 if ((target_ap[0] & 0x01) ||
3227 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
3228 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
3229 "frame");
3230 return -1;
3231 }
3232
3233 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
3234
3235 if (!sm->wpa_auth->conf.ft_over_ds) {
3236 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
3237 return -1;
3238 }
3239
3240 /* RRB - Forward action frame to the target AP */
3241 frame = os_malloc(sizeof(*frame) + len);
3242 if (frame == NULL)
3243 return -1;
3244 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
3245 frame->packet_type = FT_PACKET_REQUEST;
3246 frame->action_length = host_to_le16(len);
3247 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
3248 os_memcpy(frame + 1, data, len);
3249
3250 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
3251 sizeof(*frame) + len);
3252 os_free(frame);
3253
3254 return 0;
3255 }
3256
3257
3258 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
3259 u16 auth_transaction, u16 resp,
3260 const u8 *ies, size_t ies_len)
3261 {
3262 struct wpa_state_machine *sm = ctx;
3263 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
3264 MAC2STR(sm->addr));
3265 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
3266 WLAN_STATUS_SUCCESS, ies, ies_len);
3267 }
3268
3269
3270 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
3271 const u8 *current_ap, const u8 *sta_addr,
3272 const u8 *body, size_t len)
3273 {
3274 struct wpa_state_machine *sm;
3275 u16 status;
3276 u8 *resp_ies;
3277 size_t resp_ies_len;
3278 int res;
3279
3280 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
3281 if (sm == NULL) {
3282 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
3283 "RRB Request");
3284 return -1;
3285 }
3286
3287 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
3288
3289 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
3290 sm->ft_pending_cb_ctx = sm;
3291 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
3292 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
3293 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
3294 &resp_ies_len);
3295 if (res < 0) {
3296 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
3297 return 0;
3298 }
3299 status = res;
3300
3301 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
3302 resp_ies, resp_ies_len);
3303 os_free(resp_ies);
3304 return res;
3305 }
3306
3307
3308 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
3309 const u8 *current_ap, const u8 *sta_addr,
3310 u16 status, const u8 *resp_ies,
3311 size_t resp_ies_len)
3312 {
3313 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3314 size_t rlen;
3315 struct ft_rrb_frame *frame;
3316 u8 *pos;
3317
3318 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
3319 " CurrentAP=" MACSTR " status=%d",
3320 MAC2STR(sm->addr), MAC2STR(current_ap), status);
3321 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
3322
3323 /* RRB - Forward action frame response to the Current AP */
3324
3325 /*
3326 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
3327 * Status_Code[2] FT Request action frame body[variable]
3328 */
3329 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
3330
3331 frame = os_malloc(sizeof(*frame) + rlen);
3332 if (frame == NULL)
3333 return -1;
3334 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
3335 frame->packet_type = FT_PACKET_RESPONSE;
3336 frame->action_length = host_to_le16(rlen);
3337 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
3338 pos = (u8 *) (frame + 1);
3339 *pos++ = WLAN_ACTION_FT;
3340 *pos++ = 2; /* Action: Response */
3341 os_memcpy(pos, sta_addr, ETH_ALEN);
3342 pos += ETH_ALEN;
3343 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
3344 pos += ETH_ALEN;
3345 WPA_PUT_LE16(pos, status);
3346 pos += 2;
3347 if (resp_ies)
3348 os_memcpy(pos, resp_ies, resp_ies_len);
3349
3350 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
3351 sizeof(*frame) + rlen);
3352 os_free(frame);
3353
3354 return 0;
3355 }
3356
3357
3358 static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
3359 const struct tlv_list *tlvs,
3360 const struct wpa_ft_pmk_r0_sa *pmk_r0,
3361 const u8 *r1kh_id, const u8 *s1kh_id,
3362 const struct tlv_list *tlv_auth,
3363 const u8 *src_addr, u8 type,
3364 u8 **packet, size_t *packet_len)
3365 {
3366 u8 pmk_r1[PMK_LEN_MAX];
3367 size_t pmk_r1_len = pmk_r0->pmk_r0_len;
3368 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
3369 u8 f_pairwise[sizeof(le16)];
3370 u8 f_expires_in[sizeof(le16)];
3371 u8 f_session_timeout[sizeof(le32)];
3372 int expires_in;
3373 int session_timeout;
3374 struct os_reltime now;
3375 int ret;
3376 struct tlv_list sess_tlv[] = {
3377 { .type = FT_RRB_PMK_R1, .len = pmk_r1_len,
3378 .data = pmk_r1 },
3379 { .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
3380 .data = pmk_r1_name },
3381 { .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
3382 .data = f_pairwise },
3383 { .type = FT_RRB_EXPIRES_IN, .len = sizeof(f_expires_in),
3384 .data = f_expires_in },
3385 { .type = FT_RRB_IDENTITY, .len = pmk_r0->identity_len,
3386 .data = pmk_r0->identity },
3387 { .type = FT_RRB_RADIUS_CUI, .len = pmk_r0->radius_cui_len,
3388 .data = pmk_r0->radius_cui },
3389 { .type = FT_RRB_SESSION_TIMEOUT,
3390 .len = sizeof(f_session_timeout),
3391 .data = f_session_timeout },
3392 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3393 };
3394
3395 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_len,
3396 pmk_r0->pmk_r0_name, r1kh_id,
3397 s1kh_id, pmk_r1, pmk_r1_name) < 0)
3398 return -1;
3399 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 (for peer AP)",
3400 pmk_r1, pmk_r1_len);
3401 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name (for peer AP)",
3402 pmk_r1_name, WPA_PMK_NAME_LEN);
3403 WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);
3404
3405 os_get_reltime(&now);
3406 if (pmk_r0->expiration > now.sec)
3407 expires_in = pmk_r0->expiration - now.sec;
3408 else if (pmk_r0->expiration)
3409 expires_in = 1;
3410 else
3411 expires_in = 0;
3412 WPA_PUT_LE16(f_expires_in, expires_in);
3413
3414 if (pmk_r0->session_timeout > now.sec)
3415 session_timeout = pmk_r0->session_timeout - now.sec;
3416 else if (pmk_r0->session_timeout)
3417 session_timeout = 1;
3418 else
3419 session_timeout = 0;
3420 WPA_PUT_LE32(f_session_timeout, session_timeout);
3421
3422 ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
3423 pmk_r0->vlan, src_addr, type,
3424 packet, packet_len);
3425
3426 os_memset(pmk_r1, 0, sizeof(pmk_r1));
3427
3428 return ret;
3429 }
3430
3431
3432 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
3433 const u8 *src_addr,
3434 const u8 *enc, size_t enc_len,
3435 const u8 *auth, size_t auth_len,
3436 int no_defer)
3437 {
3438 const char *msgtype = "pull request";
3439 u8 *plain = NULL, *packet = NULL;
3440 size_t plain_len = 0, packet_len = 0;
3441 struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
3442 const u8 *key;
3443 size_t key_len;
3444 int seq_ret;
3445 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
3446 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
3447 size_t f_pmk_r0_name_len;
3448 const struct wpa_ft_pmk_r0_sa *r0;
3449 int ret;
3450 struct tlv_list resp[2];
3451 struct tlv_list resp_auth[5];
3452 struct ft_rrb_seq f_seq;
3453
3454 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
3455
3456 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
3457 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
3458
3459 if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
3460 wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
3461 goto out;
3462 }
3463
3464 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
3465 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
3466
3467 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
3468 if (r1kh) {
3469 key = r1kh->key;
3470 key_len = sizeof(r1kh->key);
3471 } else if (r1kh_wildcard) {
3472 wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
3473 key = r1kh_wildcard->key;
3474 key_len = sizeof(r1kh_wildcard->key);
3475 } else {
3476 goto out;
3477 }
3478
3479 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
3480 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
3481
3482 seq_ret = FT_RRB_SEQ_DROP;
3483 if (r1kh)
3484 seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
3485 auth, auth_len, msgtype, no_defer);
3486 if (!no_defer && r1kh_wildcard &&
3487 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
3488 /* wildcard: r1kh-id unknown or changed addr -> do a seq req */
3489 seq_ret = FT_RRB_SEQ_DEFER;
3490 }
3491
3492 if (seq_ret == FT_RRB_SEQ_DROP)
3493 goto out;
3494
3495 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
3496 src_addr, FT_PACKET_R0KH_R1KH_PULL,
3497 &plain, &plain_len) < 0)
3498 goto out;
3499
3500 if (!r1kh)
3501 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
3502 f_r1kh_id,
3503 wpa_auth->conf.rkh_pos_timeout);
3504 if (!r1kh)
3505 goto out;
3506
3507 if (seq_ret == FT_RRB_SEQ_DEFER) {
3508 wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
3509 f_r0kh_id_len, f_r1kh_id, key, key_len,
3510 enc, enc_len, auth, auth_len,
3511 &wpa_ft_rrb_rx_pull);
3512 goto out;
3513 }
3514
3515 wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
3516 msgtype);
3517 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
3518 wpa_auth->conf.rkh_pos_timeout);
3519
3520 RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
3521 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
3522 f_pmk_r0_name_len);
3523
3524 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
3525 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
3526
3527 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
3528 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3529 goto out;
3530 }
3531
3532 resp[0].type = FT_RRB_S1KH_ID;
3533 resp[0].len = f_s1kh_id_len;
3534 resp[0].data = f_s1kh_id;
3535 resp[1].type = FT_RRB_LAST_EMPTY;
3536 resp[1].len = 0;
3537 resp[1].data = NULL;
3538
3539 resp_auth[0].type = FT_RRB_NONCE;
3540 resp_auth[0].len = f_nonce_len;
3541 resp_auth[0].data = f_nonce;
3542 resp_auth[1].type = FT_RRB_SEQ;
3543 resp_auth[1].len = sizeof(f_seq);
3544 resp_auth[1].data = (u8 *) &f_seq;
3545 resp_auth[2].type = FT_RRB_R0KH_ID;
3546 resp_auth[2].len = f_r0kh_id_len;
3547 resp_auth[2].data = f_r0kh_id;
3548 resp_auth[3].type = FT_RRB_R1KH_ID;
3549 resp_auth[3].len = f_r1kh_id_len;
3550 resp_auth[3].data = f_r1kh_id;
3551 resp_auth[4].type = FT_RRB_LAST_EMPTY;
3552 resp_auth[4].len = 0;
3553 resp_auth[4].data = NULL;
3554
3555 if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0) {
3556 wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
3557 ret = wpa_ft_rrb_build(key, key_len, resp, NULL, resp_auth,
3558 NULL, wpa_auth->addr,
3559 FT_PACKET_R0KH_R1KH_RESP,
3560 &packet, &packet_len);
3561 } else {
3562 ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id,
3563 f_s1kh_id, resp_auth, wpa_auth->addr,
3564 FT_PACKET_R0KH_R1KH_RESP,
3565 &packet, &packet_len);
3566 }
3567
3568 if (!ret)
3569 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
3570 FT_PACKET_R0KH_R1KH_RESP, packet,
3571 packet_len);
3572
3573 out:
3574 os_free(plain);
3575 os_free(packet);
3576
3577 return 0;
3578 }
3579
3580
3581 /* @returns 0 on success
3582 * -1 on error
3583 * -2 if FR_RRB_PAIRWISE is missing
3584 */
3585 static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
3586 const u8 *src_addr, u8 type,
3587 const u8 *enc, size_t enc_len,
3588 const u8 *auth, size_t auth_len,
3589 const char *msgtype, u8 *s1kh_id_out,
3590 int (*cb)(struct wpa_authenticator *wpa_auth,
3591 const u8 *src_addr,
3592 const u8 *enc, size_t enc_len,
3593 const u8 *auth, size_t auth_len,
3594 int no_defer))
3595 {
3596 u8 *plain = NULL;
3597 size_t plain_len = 0;
3598 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
3599 const u8 *key;
3600 size_t key_len;
3601 int seq_ret;
3602 const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
3603 const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
3604 const u8 *f_expires_in;
3605 size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
3606 const u8 *f_identity, *f_radius_cui;
3607 const u8 *f_session_timeout;
3608 size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
3609 size_t f_expires_in_len;
3610 size_t f_identity_len, f_radius_cui_len;
3611 size_t f_session_timeout_len;
3612 int pairwise;
3613 int ret = -1;
3614 int expires_in;
3615 int session_timeout;
3616 struct vlan_description vlan;
3617 size_t pmk_r1_len;
3618
3619 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
3620 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
3621
3622 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
3623 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
3624
3625 if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
3626 wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
3627 goto out;
3628 }
3629
3630 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
3631 &r0kh_wildcard);
3632 if (r0kh) {
3633 key = r0kh->key;
3634 key_len = sizeof(r0kh->key);
3635 } else if (r0kh_wildcard) {
3636 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
3637 key = r0kh_wildcard->key;
3638 key_len = sizeof(r0kh_wildcard->key);
3639 } else {
3640 goto out;
3641 }
3642
3643 seq_ret = FT_RRB_SEQ_DROP;
3644 if (r0kh) {
3645 seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
3646 auth, auth_len, msgtype,
3647 cb ? 0 : 1);
3648 }
3649 if (cb && r0kh_wildcard &&
3650 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
3651 /* wildcard: r0kh-id unknown or changed addr -> do a seq req */
3652 seq_ret = FT_RRB_SEQ_DEFER;
3653 }
3654
3655 if (seq_ret == FT_RRB_SEQ_DROP)
3656 goto out;
3657
3658 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
3659 src_addr, type, &plain, &plain_len) < 0)
3660 goto out;
3661
3662 if (!r0kh)
3663 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
3664 f_r0kh_id, f_r0kh_id_len,
3665 wpa_auth->conf.rkh_pos_timeout);
3666 if (!r0kh)
3667 goto out;
3668
3669 if (seq_ret == FT_RRB_SEQ_DEFER) {
3670 wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
3671 f_r0kh_id_len, f_r1kh_id, key, key_len,
3672 enc, enc_len, auth, auth_len, cb);
3673 goto out;
3674 }
3675
3676 wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
3677 msgtype);
3678 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
3679 wpa_auth->conf.rkh_pos_timeout);
3680
3681 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
3682 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
3683
3684 if (s1kh_id_out)
3685 os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);
3686
3687 ret = -2;
3688 RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
3689 wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);
3690
3691 ret = -1;
3692 RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
3693 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
3694 f_pmk_r1_name, WPA_PMK_NAME_LEN);
3695
3696 pmk_r1_len = PMK_LEN;
3697 if (wpa_ft_rrb_get_tlv(plain, plain_len, FT_RRB_PMK_R1, &f_pmk_r1_len,
3698 &f_pmk_r1) == 0 &&
3699 (f_pmk_r1_len == PMK_LEN || f_pmk_r1_len == SHA384_MAC_LEN))
3700 pmk_r1_len = f_pmk_r1_len;
3701 RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, pmk_r1_len);
3702 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, pmk_r1_len);
3703
3704 pairwise = WPA_GET_LE16(f_pairwise);
3705
3706 RRB_GET_OPTIONAL(FT_RRB_EXPIRES_IN, expires_in, msgtype,
3707 sizeof(le16));
3708 if (f_expires_in)
3709 expires_in = WPA_GET_LE16(f_expires_in);
3710 else
3711 expires_in = 0;
3712
3713 wpa_printf(MSG_DEBUG, "FT: PMK-R1 %s - expires_in=%d", msgtype,
3714 expires_in);
3715
3716 if (wpa_ft_rrb_get_tlv_vlan(plain, plain_len, &vlan) < 0) {
3717 wpa_printf(MSG_DEBUG, "FT: Cannot parse vlan");
3718 wpa_ft_rrb_dump(plain, plain_len);
3719 goto out;
3720 }
3721
3722 wpa_printf(MSG_DEBUG, "FT: vlan %d%s",
3723 le_to_host16(vlan.untagged), vlan.tagged[0] ? "+" : "");
3724
3725 RRB_GET_OPTIONAL(FT_RRB_IDENTITY, identity, msgtype, -1);
3726 if (f_identity)
3727 wpa_hexdump_ascii(MSG_DEBUG, "FT: Identity", f_identity,
3728 f_identity_len);
3729
3730 RRB_GET_OPTIONAL(FT_RRB_RADIUS_CUI, radius_cui, msgtype, -1);
3731 if (f_radius_cui)
3732 wpa_hexdump_ascii(MSG_DEBUG, "FT: CUI", f_radius_cui,
3733 f_radius_cui_len);
3734
3735 RRB_GET_OPTIONAL(FT_RRB_SESSION_TIMEOUT, session_timeout, msgtype,
3736 sizeof(le32));
3737 if (f_session_timeout)
3738 session_timeout = WPA_GET_LE32(f_session_timeout);
3739 else
3740 session_timeout = 0;
3741 wpa_printf(MSG_DEBUG, "FT: session_timeout %d", session_timeout);
3742
3743 if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, pmk_r1_len,
3744 f_pmk_r1_name,
3745 pairwise, &vlan, expires_in, session_timeout,
3746 f_identity, f_identity_len, f_radius_cui,
3747 f_radius_cui_len) < 0)
3748 goto out;
3749
3750 ret = 0;
3751 out:
3752 if (plain) {
3753 os_memset(plain, 0, plain_len);
3754 os_free(plain);
3755 }
3756
3757 return ret;
3758
3759 }
3760
3761
3762 static void ft_finish_pull(struct wpa_state_machine *sm)
3763 {
3764 int res;
3765 u8 *resp_ies;
3766 size_t resp_ies_len;
3767 u16 status;
3768
3769 if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
3770 return;
3771
3772 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
3773 wpabuf_len(sm->ft_pending_req_ies),
3774 &resp_ies, &resp_ies_len);
3775 if (res < 0) {
3776 /* this loop is broken by ft_pending_pull_left_retries */
3777 wpa_printf(MSG_DEBUG,
3778 "FT: Callback postponed until response is available");
3779 return;
3780 }
3781 wpabuf_free(sm->ft_pending_req_ies);
3782 sm->ft_pending_req_ies = NULL;
3783 status = res;
3784 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
3785 " - status %u", MAC2STR(sm->addr), status);
3786
3787 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
3788 sm->ft_pending_auth_transaction + 1, status,
3789 resp_ies, resp_ies_len);
3790 os_free(resp_ies);
3791 }
3792
3793
3794 struct ft_get_sta_ctx {
3795 const u8 *nonce;
3796 const u8 *s1kh_id;
3797 struct wpa_state_machine *sm;
3798 };
3799
3800
3801 static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
3802 {
3803 struct ft_get_sta_ctx *info = ctx;
3804
3805 if ((info->s1kh_id &&
3806 os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) ||
3807 os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
3808 FT_RRB_NONCE_LEN) != 0 ||
3809 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
3810 return 0;
3811
3812 info->sm = sm;
3813
3814 return 1;
3815 }
3816
3817
3818 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
3819 const u8 *src_addr,
3820 const u8 *enc, size_t enc_len,
3821 const u8 *auth, size_t auth_len,
3822 int no_defer)
3823 {
3824 const char *msgtype = "pull response";
3825 int nak, ret = -1;
3826 struct ft_get_sta_ctx ctx;
3827 u8 s1kh_id[ETH_ALEN];
3828 const u8 *f_nonce;
3829 size_t f_nonce_len;
3830
3831 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
3832
3833 RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
3834 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
3835
3836 os_memset(&ctx, 0, sizeof(ctx));
3837 ctx.nonce = f_nonce;
3838 if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
3839 /* nonce not found */
3840 wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
3841 return -1;
3842 }
3843
3844 ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
3845 enc, enc_len, auth, auth_len, msgtype, s1kh_id,
3846 no_defer ? NULL : &wpa_ft_rrb_rx_resp);
3847 if (ret == -2) {
3848 ret = 0;
3849 nak = 1;
3850 } else {
3851 nak = 0;
3852 }
3853 if (ret < 0)
3854 return -1;
3855
3856 ctx.s1kh_id = s1kh_id;
3857 if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
3858 wpa_printf(MSG_DEBUG,
3859 "FT: Response to a pending pull request for " MACSTR,
3860 MAC2STR(ctx.sm->addr));
3861 eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
3862 if (nak)
3863 ctx.sm->ft_pending_pull_left_retries = 0;
3864 ft_finish_pull(ctx.sm);
3865 }
3866
3867 out:
3868 return ret;
3869 }
3870
3871
3872 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
3873 const u8 *src_addr,
3874 const u8 *enc, size_t enc_len,
3875 const u8 *auth, size_t auth_len, int no_defer)
3876 {
3877 const char *msgtype = "push";
3878
3879 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
3880
3881 if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
3882 enc, enc_len, auth, auth_len, msgtype, NULL,
3883 no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
3884 return -1;
3885
3886 return 0;
3887 }
3888
3889
3890 static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
3891 const u8 *src_addr, int type,
3892 const u8 *enc, size_t enc_len,
3893 const u8 *auth, size_t auth_len,
3894 struct ft_remote_seq **rkh_seq,
3895 u8 **key, size_t *key_len,
3896 struct ft_remote_r0kh **r0kh_out,
3897 struct ft_remote_r1kh **r1kh_out,
3898 struct ft_remote_r0kh **r0kh_wildcard_out,
3899 struct ft_remote_r1kh **r1kh_wildcard_out)
3900 {
3901 struct ft_remote_r0kh *r0kh = NULL;
3902 struct ft_remote_r1kh *r1kh = NULL;
3903 const u8 *f_r0kh_id, *f_r1kh_id;
3904 size_t f_r0kh_id_len, f_r1kh_id_len;
3905 int to_r0kh, to_r1kh;
3906 u8 *plain = NULL;
3907 size_t plain_len = 0;
3908 struct ft_remote_r0kh *r0kh_wildcard;
3909 struct ft_remote_r1kh *r1kh_wildcard;
3910
3911 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
3912 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
3913
3914 to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
3915 to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);
3916
3917 if (to_r0kh && to_r1kh) {
3918 wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
3919 goto out;
3920 }
3921
3922 if (!to_r0kh && !to_r1kh) {
3923 wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
3924 goto out;
3925 }
3926
3927 if (!to_r0kh) {
3928 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
3929 &r0kh, &r0kh_wildcard);
3930 if (!r0kh_wildcard &&
3931 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
3932 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
3933 f_r0kh_id, f_r0kh_id_len);
3934 goto out;
3935 }
3936 if (r0kh) {
3937 *key = r0kh->key;
3938 *key_len = sizeof(r0kh->key);
3939 } else {
3940 *key = r0kh_wildcard->key;
3941 *key_len = sizeof(r0kh_wildcard->key);
3942 }
3943 }
3944
3945 if (!to_r1kh) {
3946 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
3947 &r1kh_wildcard);
3948 if (!r1kh_wildcard &&
3949 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
3950 wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
3951 f_r1kh_id, FT_R1KH_ID_LEN);
3952 goto out;
3953 }
3954 if (r1kh) {
3955 *key = r1kh->key;
3956 *key_len = sizeof(r1kh->key);
3957 } else {
3958 *key = r1kh_wildcard->key;
3959 *key_len = sizeof(r1kh_wildcard->key);
3960 }
3961 }
3962
3963 if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
3964 src_addr, type, &plain, &plain_len) < 0)
3965 goto out;
3966
3967 os_free(plain);
3968
3969 if (!to_r0kh) {
3970 if (!r0kh)
3971 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
3972 src_addr, f_r0kh_id,
3973 f_r0kh_id_len,
3974 ftRRBseqTimeout);
3975 if (!r0kh)
3976 goto out;
3977
3978 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
3979 *rkh_seq = r0kh->seq;
3980 if (r0kh_out)
3981 *r0kh_out = r0kh;
3982 if (r0kh_wildcard_out)
3983 *r0kh_wildcard_out = r0kh_wildcard;
3984 }
3985
3986 if (!to_r1kh) {
3987 if (!r1kh)
3988 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
3989 src_addr, f_r1kh_id,
3990 ftRRBseqTimeout);
3991 if (!r1kh)
3992 goto out;
3993
3994 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
3995 *rkh_seq = r1kh->seq;
3996 if (r1kh_out)
3997 *r1kh_out = r1kh;
3998 if (r1kh_wildcard_out)
3999 *r1kh_wildcard_out = r1kh_wildcard;
4000 }
4001
4002 return 0;
4003 out:
4004 return -1;
4005 }
4006
4007
4008 static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
4009 const u8 *src_addr,
4010 const u8 *enc, size_t enc_len,
4011 const u8 *auth, size_t auth_len,
4012 int no_defer)
4013 {
4014 int ret = -1;
4015 struct ft_rrb_seq f_seq;
4016 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
4017 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
4018 struct ft_remote_seq *rkh_seq = NULL;
4019 u8 *packet = NULL, *key = NULL;
4020 size_t packet_len = 0, key_len = 0;
4021 struct tlv_list seq_resp_auth[5];
4022
4023 wpa_printf(MSG_DEBUG, "FT: Received sequence number request");
4024
4025 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
4026 enc, enc_len, auth, auth_len, &rkh_seq, &key,
4027 &key_len, NULL, NULL, NULL, NULL) < 0)
4028 goto out;
4029
4030 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
4031 wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);
4032
4033 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
4034 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
4035
4036 if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
4037 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
4038 goto out;
4039 }
4040
4041 seq_resp_auth[0].type = FT_RRB_NONCE;
4042 seq_resp_auth[0].len = f_nonce_len;
4043 seq_resp_auth[0].data = f_nonce;
4044 seq_resp_auth[1].type = FT_RRB_SEQ;
4045 seq_resp_auth[1].len = sizeof(f_seq);
4046 seq_resp_auth[1].data = (u8 *) &f_seq;
4047 seq_resp_auth[2].type = FT_RRB_R0KH_ID;
4048 seq_resp_auth[2].len = f_r0kh_id_len;
4049 seq_resp_auth[2].data = f_r0kh_id;
4050 seq_resp_auth[3].type = FT_RRB_R1KH_ID;
4051 seq_resp_auth[3].len = FT_R1KH_ID_LEN;
4052 seq_resp_auth[3].data = f_r1kh_id;
4053 seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
4054 seq_resp_auth[4].len = 0;
4055 seq_resp_auth[4].data = NULL;
4056
4057 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth, NULL,
4058 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
4059 &packet, &packet_len) < 0)
4060 goto out;
4061
4062 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
4063 FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
4064 packet_len);
4065
4066 out:
4067 os_free(packet);
4068
4069 return ret;
4070 }
4071
4072
4073 static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
4074 const u8 *src_addr,
4075 const u8 *enc, size_t enc_len,
4076 const u8 *auth, size_t auth_len,
4077 int no_defer)
4078 {
4079 u8 *key = NULL;
4080 size_t key_len = 0;
4081 struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
4082 struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
4083 const u8 *f_nonce, *f_seq;
4084 size_t f_nonce_len, f_seq_len;
4085 struct ft_remote_seq *rkh_seq = NULL;
4086 struct ft_remote_item *item;
4087 struct os_reltime now, now_remote;
4088 int seq_ret, found;
4089 const struct ft_rrb_seq *msg_both;
4090 u32 msg_dom, msg_seq;
4091
4092 wpa_printf(MSG_DEBUG, "FT: Received sequence number response");
4093
4094 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
4095 enc, enc_len, auth, auth_len, &rkh_seq, &key,
4096 &key_len, &r0kh, &r1kh, &r0kh_wildcard,
4097 &r1kh_wildcard) < 0)
4098 goto out;
4099
4100 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
4101 wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
4102 f_nonce_len);
4103
4104 found = 0;
4105 dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
4106 list) {
4107 if (os_memcmp_const(f_nonce, item->nonce,
4108 FT_RRB_NONCE_LEN) != 0 ||
4109 os_get_reltime(&now) < 0 ||
4110 os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
4111 continue;
4112
4113 found = 1;
4114 break;
4115 }
4116 if (!found) {
4117 wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
4118 goto out;
4119 }
4120
4121 if (r0kh) {
4122 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
4123 wpa_auth->conf.rkh_pos_timeout);
4124 if (r0kh_wildcard)
4125 os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
4126 }
4127
4128 if (r1kh) {
4129 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
4130 wpa_auth->conf.rkh_pos_timeout);
4131 if (r1kh_wildcard)
4132 os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
4133 }
4134
4135 seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
4136 auth_len, "seq response", 1);
4137 if (seq_ret == FT_RRB_SEQ_OK) {
4138 wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
4139 wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
4140 auth_len, "seq response");
4141 } else {
4142 wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");
4143
4144 RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
4145 sizeof(*msg_both));
4146 msg_both = (const struct ft_rrb_seq *) f_seq;
4147
4148 msg_dom = le_to_host32(msg_both->dom);
4149 msg_seq = le_to_host32(msg_both->seq);
4150 now_remote.sec = le_to_host32(msg_both->ts);
4151 now_remote.usec = 0;
4152
4153 rkh_seq->rx.num_last = 2;
4154 rkh_seq->rx.dom = msg_dom;
4155 rkh_seq->rx.offsetidx = 0;
4156 /* Accept some older, possibly cached packets as well */
4157 rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
4158 dl_list_len(&rkh_seq->rx.queue);
4159 rkh_seq->rx.last[1] = msg_seq;
4160
4161 /* local time - offset = remote time
4162 * <=> local time - remote time = offset */
4163 os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
4164 }
4165
4166 wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);
4167
4168 return 0;
4169 out:
4170 return -1;
4171 }
4172
4173
4174 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
4175 const u8 *data, size_t data_len)
4176 {
4177 struct ft_rrb_frame *frame;
4178 u16 alen;
4179 const u8 *pos, *end, *start;
4180 u8 action;
4181 const u8 *sta_addr, *target_ap_addr;
4182
4183 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
4184 MAC2STR(src_addr));
4185
4186 if (data_len < sizeof(*frame)) {
4187 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
4188 (unsigned long) data_len);
4189 return -1;
4190 }
4191
4192 pos = data;
4193 frame = (struct ft_rrb_frame *) pos;
4194 pos += sizeof(*frame);
4195
4196 alen = le_to_host16(frame->action_length);
4197 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
4198 "action_length=%d ap_address=" MACSTR,
4199 frame->frame_type, frame->packet_type, alen,
4200 MAC2STR(frame->ap_address));
4201
4202 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
4203 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
4204 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
4205 "unrecognized type %d", frame->frame_type);
4206 return -1;
4207 }
4208
4209 if (alen > data_len - sizeof(*frame)) {
4210 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
4211 "frame");
4212 return -1;
4213 }
4214
4215 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
4216
4217 if (alen < 1 + 1 + 2 * ETH_ALEN) {
4218 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
4219 "room for Action Frame body); alen=%lu",
4220 (unsigned long) alen);
4221 return -1;
4222 }
4223 start = pos;
4224 end = pos + alen;
4225
4226 if (*pos != WLAN_ACTION_FT) {
4227 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
4228 "%d", *pos);
4229 return -1;
4230 }
4231
4232 pos++;
4233 action = *pos++;
4234 sta_addr = pos;
4235 pos += ETH_ALEN;
4236 target_ap_addr = pos;
4237 pos += ETH_ALEN;
4238 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
4239 MACSTR " target_ap_addr=" MACSTR,
4240 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
4241
4242 if (frame->packet_type == FT_PACKET_REQUEST) {
4243 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
4244
4245 if (action != 1) {
4246 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
4247 "RRB Request", action);
4248 return -1;
4249 }
4250
4251 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
4252 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
4253 "RRB Request does not match with own "
4254 "address");
4255 return -1;
4256 }
4257
4258 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
4259 sta_addr, pos, end - pos) < 0)
4260 return -1;
4261 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
4262 u16 status_code;
4263
4264 if (end - pos < 2) {
4265 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
4266 "code in RRB Response");
4267 return -1;
4268 }
4269 status_code = WPA_GET_LE16(pos);
4270 pos += 2;
4271
4272 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
4273 "(status_code=%d)", status_code);
4274
4275 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
4276 return -1;
4277 } else {
4278 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
4279 "packet_type %d", frame->packet_type);
4280 return -1;
4281 }
4282
4283 if (end > pos) {
4284 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
4285 pos, end - pos);
4286 }
4287
4288 return 0;
4289 }
4290
4291
4292 void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
4293 const u8 *dst_addr, u8 oui_suffix, const u8 *data,
4294 size_t data_len)
4295 {
4296 const u8 *auth, *enc;
4297 size_t alen, elen;
4298 int no_defer = 0;
4299
4300 wpa_printf(MSG_DEBUG, "FT: RRB-OUI received frame from remote AP "
4301 MACSTR, MAC2STR(src_addr));
4302 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame - oui_suffix=%d", oui_suffix);
4303
4304 if (is_multicast_ether_addr(src_addr)) {
4305 wpa_printf(MSG_DEBUG,
4306 "FT: RRB-OUI received frame from multicast address "
4307 MACSTR, MAC2STR(src_addr));
4308 return;
4309 }
4310
4311 if (is_multicast_ether_addr(dst_addr)) {
4312 wpa_printf(MSG_DEBUG,
4313 "FT: RRB-OUI received frame from remote AP " MACSTR
4314 " to multicast address " MACSTR,
4315 MAC2STR(src_addr), MAC2STR(dst_addr));
4316 no_defer = 1;
4317 }
4318
4319 if (data_len < sizeof(u16)) {
4320 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
4321 return;
4322 }
4323
4324 alen = WPA_GET_LE16(data);
4325 if (data_len < sizeof(u16) + alen) {
4326 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
4327 return;
4328 }
4329
4330 auth = data + sizeof(u16);
4331 enc = data + sizeof(u16) + alen;
4332 elen = data_len - sizeof(u16) - alen;
4333
4334 switch (oui_suffix) {
4335 case FT_PACKET_R0KH_R1KH_PULL:
4336 wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
4337 no_defer);
4338 break;
4339 case FT_PACKET_R0KH_R1KH_RESP:
4340 wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
4341 no_defer);
4342 break;
4343 case FT_PACKET_R0KH_R1KH_PUSH:
4344 wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
4345 no_defer);
4346 break;
4347 case FT_PACKET_R0KH_R1KH_SEQ_REQ:
4348 wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
4349 no_defer);
4350 break;
4351 case FT_PACKET_R0KH_R1KH_SEQ_RESP:
4352 wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
4353 alen, no_defer);
4354 break;
4355 }
4356 }
4357
4358
4359 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
4360 struct wpa_ft_pmk_r0_sa *pmk_r0,
4361 struct ft_remote_r1kh *r1kh,
4362 const u8 *s1kh_id)
4363 {
4364 u8 *packet;
4365 size_t packet_len;
4366 struct ft_rrb_seq f_seq;
4367 struct tlv_list push[] = {
4368 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
4369 .data = s1kh_id },
4370 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
4371 .data = pmk_r0->pmk_r0_name },
4372 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
4373 };
4374 struct tlv_list push_auth[] = {
4375 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
4376 .data = (u8 *) &f_seq },
4377 { .type = FT_RRB_R0KH_ID,
4378 .len = wpa_auth->conf.r0_key_holder_len,
4379 .data = wpa_auth->conf.r0_key_holder },
4380 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
4381 .data = r1kh->id },
4382 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
4383 };
4384
4385 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
4386 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
4387 return -1;
4388 }
4389
4390 if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
4391 r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
4392 FT_PACKET_R0KH_R1KH_PUSH,
4393 &packet, &packet_len) < 0)
4394 return -1;
4395
4396 wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
4397 packet, packet_len);
4398
4399 os_free(packet);
4400 return 0;
4401 }
4402
4403
4404 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
4405 {
4406 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
4407 struct wpa_ft_pmk_r0_sa *r0, *r0found = NULL;
4408 struct ft_remote_r1kh *r1kh;
4409
4410 if (!wpa_auth->conf.pmk_r1_push)
4411 return;
4412 if (!wpa_auth->conf.r1kh_list)
4413 return;
4414
4415 dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
4416 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) {
4417 r0found = r0;
4418 break;
4419 }
4420 }
4421
4422 r0 = r0found;
4423 if (r0 == NULL || r0->pmk_r1_pushed)
4424 return;
4425 r0->pmk_r1_pushed = 1;
4426
4427 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
4428 "for STA " MACSTR, MAC2STR(addr));
4429
4430 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
4431 if (is_zero_ether_addr(r1kh->addr) ||
4432 is_zero_ether_addr(r1kh->id))
4433 continue;
4434 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
4435 continue;
4436 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
4437 }
4438 }
4439
4440 #endif /* CONFIG_IEEE80211R_AP */
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