• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 "common/ocv.h"
17 #include "common/wpa_ctrl.h"
18 #include "drivers/driver.h"
19 #include "crypto/aes.h"
20 #include "crypto/aes_siv.h"
21 #include "crypto/aes_wrap.h"
22 #include "crypto/sha384.h"
23 #include "crypto/random.h"
24 #include "ap_config.h"
25 #include "ieee802_11.h"
26 #include "wmm.h"
27 #include "wpa_auth.h"
28 #include "wpa_auth_i.h"
29 #include "pmksa_cache_auth.h"
30 
31 
32 #ifdef CONFIG_IEEE80211R_AP
33 
34 const unsigned int ftRRBseqTimeout = 10;
35 const unsigned int ftRRBmaxQueueLen = 100;
36 
37 
38 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
39 				     const u8 *current_ap, const u8 *sta_addr,
40 				     u16 status, const u8 *resp_ies,
41 				     size_t resp_ies_len);
42 static void ft_finish_pull(struct wpa_state_machine *sm);
43 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
44 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);
45 
46 struct tlv_list {
47 	u16 type;
48 	size_t len;
49 	const u8 *data;
50 };
51 
52 
53 /**
54  * wpa_ft_rrb_decrypt - Decrypt FT RRB message
55  * @key: AES-SIV key for AEAD
56  * @key_len: Length of key in octets
57  * @enc: Pointer to encrypted TLVs
58  * @enc_len: Length of encrypted TLVs in octets
59  * @auth: Pointer to authenticated TLVs
60  * @auth_len: Length of authenticated TLVs in octets
61  * @src_addr: MAC address of the frame sender
62  * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
63  * @plain: Pointer to return the pointer to the allocated plaintext buffer;
64  *	needs to be freed by the caller if not NULL;
65  *	will only be returned on success
66  * @plain_len: Pointer to return the length of the allocated plaintext buffer
67  *	in octets
68  * Returns: 0 on success, -1 on error
69  */
wpa_ft_rrb_decrypt(const u8 * key,const size_t key_len,const u8 * enc,size_t enc_len,const u8 * auth,const size_t auth_len,const u8 * src_addr,u8 type,u8 ** plain,size_t * plain_size)70 static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
71 			      const u8 *enc, size_t enc_len,
72 			      const u8 *auth, const size_t auth_len,
73 			      const u8 *src_addr, u8 type,
74 			      u8 **plain, size_t *plain_size)
75 {
76 	const u8 *ad[3] = { src_addr, auth, &type };
77 	size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
78 
79 	wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
80 		   MAC2STR(src_addr), type);
81 	wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
82 	wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs", enc, enc_len);
83 	wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);
84 
85 	if (!key) { /* skip decryption */
86 		*plain = os_memdup(enc, enc_len);
87 		if (enc_len > 0 && !*plain)
88 			goto err;
89 
90 		*plain_size = enc_len;
91 
92 		return 0;
93 	}
94 
95 	*plain = NULL;
96 
97 	/* SIV overhead */
98 	if (enc_len < AES_BLOCK_SIZE)
99 		goto err;
100 
101 	*plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
102 	if (!*plain)
103 		goto err;
104 
105 	if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
106 			    *plain) < 0) {
107 		if (enc_len < AES_BLOCK_SIZE + 2)
108 			goto err;
109 
110 		/* Try to work around Ethernet devices that add extra
111 		 * two octet padding even if the frame is longer than
112 		 * the minimum Ethernet frame. */
113 		enc_len -= 2;
114 		if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
115 				    *plain) < 0)
116 			goto err;
117 	}
118 
119 	*plain_size = enc_len - AES_BLOCK_SIZE;
120 	wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
121 			*plain, *plain_size);
122 	return 0;
123 err:
124 	os_free(*plain);
125 	*plain = NULL;
126 	*plain_size = 0;
127 
128 	wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");
129 
130 	return -1;
131 }
132 
133 
134 /* get first tlv record in packet matching type
135  * @data (decrypted) packet
136  * @return 0 on success else -1
137  */
wpa_ft_rrb_get_tlv(const u8 * plain,size_t plain_len,u16 type,size_t * tlv_len,const u8 ** tlv_data)138 static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
139 			      u16 type, size_t *tlv_len, const u8 **tlv_data)
140 {
141 	const struct ft_rrb_tlv *f;
142 	size_t left;
143 	le16 type16;
144 	size_t len;
145 
146 	left = plain_len;
147 	type16 = host_to_le16(type);
148 
149 	while (left >= sizeof(*f)) {
150 		f = (const struct ft_rrb_tlv *) plain;
151 
152 		left -= sizeof(*f);
153 		plain += sizeof(*f);
154 		len = le_to_host16(f->len);
155 
156 		if (left < len) {
157 			wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
158 			break;
159 		}
160 
161 		if (f->type == type16) {
162 			*tlv_len = len;
163 			*tlv_data = plain;
164 			return 0;
165 		}
166 
167 		left -= len;
168 		plain += len;
169 	}
170 
171 	return -1;
172 }
173 
174 
wpa_ft_rrb_dump(const u8 * plain,const size_t plain_len)175 static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
176 {
177 	const struct ft_rrb_tlv *f;
178 	size_t left;
179 	size_t len;
180 
181 	left = plain_len;
182 
183 	wpa_printf(MSG_DEBUG, "FT: RRB dump message");
184 	while (left >= sizeof(*f)) {
185 		f = (const struct ft_rrb_tlv *) plain;
186 
187 		left -= sizeof(*f);
188 		plain += sizeof(*f);
189 		len = le_to_host16(f->len);
190 
191 		wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
192 			   le_to_host16(f->type), len);
193 
194 		if (left < len) {
195 			wpa_printf(MSG_DEBUG,
196 				   "FT: RRB message truncated: left %zu bytes, need %zu",
197 				   left, len);
198 			break;
199 		}
200 
201 		wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);
202 
203 		left -= len;
204 		plain += len;
205 	}
206 
207 	if (left > 0)
208 		wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);
209 
210 	wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
211 }
212 
213 
cmp_int(const void * a,const void * b)214 static int cmp_int(const void *a, const void *b)
215 {
216 	int x, y;
217 
218 	x = *((int *) a);
219 	y = *((int *) b);
220 	return x - y;
221 }
222 
223 
wpa_ft_rrb_get_tlv_vlan(const u8 * plain,const size_t plain_len,struct vlan_description * vlan)224 static int wpa_ft_rrb_get_tlv_vlan(const u8 *plain, const size_t plain_len,
225 				   struct vlan_description *vlan)
226 {
227 	struct ft_rrb_tlv *f;
228 	size_t left;
229 	size_t len;
230 	int taggedidx;
231 	int vlan_id;
232 	int type;
233 
234 	left = plain_len;
235 	taggedidx = 0;
236 	os_memset(vlan, 0, sizeof(*vlan));
237 
238 	while (left >= sizeof(*f)) {
239 		f = (struct ft_rrb_tlv *) plain;
240 
241 		left -= sizeof(*f);
242 		plain += sizeof(*f);
243 
244 		len = le_to_host16(f->len);
245 		type = le_to_host16(f->type);
246 
247 		if (left < len) {
248 			wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
249 			return -1;
250 		}
251 
252 		if (type != FT_RRB_VLAN_UNTAGGED && type != FT_RRB_VLAN_TAGGED)
253 			goto skip;
254 
255 		if (type == FT_RRB_VLAN_UNTAGGED && len != sizeof(le16)) {
256 			wpa_printf(MSG_DEBUG,
257 				   "FT: RRB VLAN_UNTAGGED invalid length");
258 			return -1;
259 		}
260 
261 		if (type == FT_RRB_VLAN_TAGGED && len % sizeof(le16) != 0) {
262 			wpa_printf(MSG_DEBUG,
263 				   "FT: RRB VLAN_TAGGED invalid length");
264 			return -1;
265 		}
266 
267 		while (len >= sizeof(le16)) {
268 			vlan_id = WPA_GET_LE16(plain);
269 			plain += sizeof(le16);
270 			left -= sizeof(le16);
271 			len -= sizeof(le16);
272 
273 			if (vlan_id <= 0 || vlan_id > MAX_VLAN_ID) {
274 				wpa_printf(MSG_DEBUG,
275 					   "FT: RRB VLAN ID invalid %d",
276 					   vlan_id);
277 				continue;
278 			}
279 
280 			if (type == FT_RRB_VLAN_UNTAGGED)
281 				vlan->untagged = vlan_id;
282 
283 			if (type == FT_RRB_VLAN_TAGGED &&
284 			    taggedidx < MAX_NUM_TAGGED_VLAN) {
285 				vlan->tagged[taggedidx] = vlan_id;
286 				taggedidx++;
287 			} else if (type == FT_RRB_VLAN_TAGGED) {
288 				wpa_printf(MSG_DEBUG, "FT: RRB too many VLANs");
289 			}
290 		}
291 
292 	skip:
293 		left -= len;
294 		plain += len;
295 	}
296 
297 	if (taggedidx)
298 		qsort(vlan->tagged, taggedidx, sizeof(int), cmp_int);
299 
300 	vlan->notempty = vlan->untagged || vlan->tagged[0];
301 
302 	return 0;
303 }
304 
305 
wpa_ft_tlv_len(const struct tlv_list * tlvs)306 static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
307 {
308 	size_t tlv_len = 0;
309 	int i;
310 
311 	if (!tlvs)
312 		return 0;
313 
314 	for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
315 		tlv_len += sizeof(struct ft_rrb_tlv);
316 		tlv_len += tlvs[i].len;
317 	}
318 
319 	return tlv_len;
320 }
321 
322 
wpa_ft_tlv_lin(const struct tlv_list * tlvs,u8 * start,u8 * endpos)323 static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
324 			     u8 *endpos)
325 {
326 	int i;
327 	size_t tlv_len;
328 	struct ft_rrb_tlv *hdr;
329 	u8 *pos;
330 
331 	if (!tlvs)
332 		return 0;
333 
334 	tlv_len = 0;
335 	pos = start;
336 	for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
337 		if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
338 			return tlv_len;
339 		tlv_len += sizeof(*hdr);
340 		hdr = (struct ft_rrb_tlv *) pos;
341 		hdr->type = host_to_le16(tlvs[i].type);
342 		hdr->len = host_to_le16(tlvs[i].len);
343 		pos = start + tlv_len;
344 
345 		if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
346 			return tlv_len;
347 		if (tlvs[i].len == 0)
348 			continue;
349 		tlv_len += tlvs[i].len;
350 		os_memcpy(pos, tlvs[i].data, tlvs[i].len);
351 		pos = start + tlv_len;
352 	}
353 
354 	return tlv_len;
355 }
356 
357 
wpa_ft_vlan_len(const struct vlan_description * vlan)358 static size_t wpa_ft_vlan_len(const struct vlan_description *vlan)
359 {
360 	size_t tlv_len = 0;
361 	int i;
362 
363 	if (!vlan || !vlan->notempty)
364 		return 0;
365 
366 	if (vlan->untagged) {
367 		tlv_len += sizeof(struct ft_rrb_tlv);
368 		tlv_len += sizeof(le16);
369 	}
370 	if (vlan->tagged[0])
371 		tlv_len += sizeof(struct ft_rrb_tlv);
372 	for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++)
373 		tlv_len += sizeof(le16);
374 
375 	return tlv_len;
376 }
377 
378 
wpa_ft_vlan_lin(const struct vlan_description * vlan,u8 * start,u8 * endpos)379 static size_t wpa_ft_vlan_lin(const struct vlan_description *vlan,
380 			      u8 *start, u8 *endpos)
381 {
382 	size_t tlv_len;
383 	int i, len;
384 	struct ft_rrb_tlv *hdr;
385 	u8 *pos = start;
386 
387 	if (!vlan || !vlan->notempty)
388 		return 0;
389 
390 	tlv_len = 0;
391 	if (vlan->untagged) {
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_UNTAGGED);
397 		hdr->len = host_to_le16(sizeof(le16));
398 		pos = start + tlv_len;
399 
400 		tlv_len += sizeof(le16);
401 		if (start + tlv_len > endpos)
402 			return tlv_len;
403 		WPA_PUT_LE16(pos, vlan->untagged);
404 		pos = start + tlv_len;
405 	}
406 
407 	if (!vlan->tagged[0])
408 		return tlv_len;
409 
410 	tlv_len += sizeof(*hdr);
411 	if (start + tlv_len > endpos)
412 		return tlv_len;
413 	hdr = (struct ft_rrb_tlv *) pos;
414 	hdr->type = host_to_le16(FT_RRB_VLAN_TAGGED);
415 	len = 0; /* len is computed below */
416 	pos = start + tlv_len;
417 
418 	for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) {
419 		tlv_len += sizeof(le16);
420 		if (start + tlv_len > endpos)
421 			break;
422 		len += sizeof(le16);
423 		WPA_PUT_LE16(pos, vlan->tagged[i]);
424 		pos = start + tlv_len;
425 	}
426 
427 	hdr->len = host_to_le16(len);
428 
429 	return tlv_len;
430 }
431 
432 
wpa_ft_rrb_lin(const struct tlv_list * tlvs1,const struct tlv_list * tlvs2,const struct vlan_description * vlan,u8 ** plain,size_t * plain_len)433 static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
434 			  const struct tlv_list *tlvs2,
435 			  const struct vlan_description *vlan,
436 			  u8 **plain, size_t *plain_len)
437 {
438 	u8 *pos, *endpos;
439 	size_t tlv_len;
440 
441 	tlv_len = wpa_ft_tlv_len(tlvs1);
442 	tlv_len += wpa_ft_tlv_len(tlvs2);
443 	tlv_len += wpa_ft_vlan_len(vlan);
444 
445 	*plain_len = tlv_len;
446 	*plain = os_zalloc(tlv_len);
447 	if (!*plain) {
448 		wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
449 		goto err;
450 	}
451 
452 	pos = *plain;
453 	endpos = *plain + tlv_len;
454 	pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
455 	pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
456 	pos += wpa_ft_vlan_lin(vlan, pos, endpos);
457 
458 	/* sanity check */
459 	if (pos != endpos) {
460 		wpa_printf(MSG_ERROR, "FT: Length error building RRB");
461 		goto err;
462 	}
463 
464 	return 0;
465 
466 err:
467 	os_free(*plain);
468 	*plain = NULL;
469 	*plain_len = 0;
470 	return -1;
471 }
472 
473 
wpa_ft_rrb_encrypt(const u8 * key,const size_t key_len,const u8 * plain,const size_t plain_len,const u8 * auth,const size_t auth_len,const u8 * src_addr,u8 type,u8 * enc)474 static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
475 			      const u8 *plain, const size_t plain_len,
476 			      const u8 *auth, const size_t auth_len,
477 			      const u8 *src_addr, u8 type, u8 *enc)
478 {
479 	const u8 *ad[3] = { src_addr, auth, &type };
480 	size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
481 
482 	wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
483 		   MAC2STR(src_addr), type);
484 	wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
485 			plain, plain_len);
486 	wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
487 	wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);
488 
489 	if (!key) {
490 		/* encryption not needed, return plaintext as packet */
491 		os_memcpy(enc, plain, plain_len);
492 	} else if (aes_siv_encrypt(key, key_len, plain, plain_len,
493 				   3, ad, ad_len, enc) < 0) {
494 		wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
495 		return -1;
496 	}
497 	wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs",
498 		    enc, plain_len + AES_BLOCK_SIZE);
499 
500 	return 0;
501 }
502 
503 
504 /**
505  * wpa_ft_rrb_build - Build and encrypt an FT RRB message
506  * @key: AES-SIV key for AEAD
507  * @key_len: Length of key in octets
508  * @tlvs_enc0: First set of to-be-encrypted TLVs
509  * @tlvs_enc1: Second set of to-be-encrypted TLVs
510  * @tlvs_auth: Set of to-be-authenticated TLVs
511  * @src_addr: MAC address of the frame sender
512  * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
513  * @packet Pointer to return the pointer to the allocated packet buffer;
514  *         needs to be freed by the caller if not null;
515  *         will only be returned on success
516  * @packet_len: Pointer to return the length of the allocated buffer in octets
517  * Returns: 0 on success, -1 on error
518  */
wpa_ft_rrb_build(const u8 * key,const size_t key_len,const struct tlv_list * tlvs_enc0,const struct tlv_list * tlvs_enc1,const struct tlv_list * tlvs_auth,const struct vlan_description * vlan,const u8 * src_addr,u8 type,u8 ** packet,size_t * packet_len)519 static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
520 			    const struct tlv_list *tlvs_enc0,
521 			    const struct tlv_list *tlvs_enc1,
522 			    const struct tlv_list *tlvs_auth,
523 			    const struct vlan_description *vlan,
524 			    const u8 *src_addr, u8 type,
525 			    u8 **packet, size_t *packet_len)
526 {
527 	u8 *plain = NULL, *auth = NULL, *pos, *tmp;
528 	size_t plain_len = 0, auth_len = 0;
529 	int ret = -1;
530 	size_t pad_len = 0;
531 
532 	*packet = NULL;
533 	if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, vlan, &plain, &plain_len) < 0)
534 		goto out;
535 
536 	if (wpa_ft_rrb_lin(tlvs_auth, NULL, NULL, &auth, &auth_len) < 0)
537 		goto out;
538 
539 	*packet_len = sizeof(u16) + auth_len + plain_len;
540 	if (key)
541 		*packet_len += AES_BLOCK_SIZE;
542 #define RRB_MIN_MSG_LEN 64
543 	if (*packet_len < RRB_MIN_MSG_LEN) {
544 		pad_len = RRB_MIN_MSG_LEN - *packet_len;
545 		if (pad_len < sizeof(struct ft_rrb_tlv))
546 			pad_len = sizeof(struct ft_rrb_tlv);
547 		wpa_printf(MSG_DEBUG,
548 			   "FT: Pad message to minimum Ethernet frame length (%d --> %d)",
549 			   (int) *packet_len, (int) (*packet_len + pad_len));
550 		*packet_len += pad_len;
551 		tmp = os_realloc(auth, auth_len + pad_len);
552 		if (!tmp)
553 			goto out;
554 		auth = tmp;
555 		pos = auth + auth_len;
556 		WPA_PUT_LE16(pos, FT_RRB_LAST_EMPTY);
557 		pos += 2;
558 		WPA_PUT_LE16(pos, pad_len - sizeof(struct ft_rrb_tlv));
559 		pos += 2;
560 		os_memset(pos, 0, pad_len - sizeof(struct ft_rrb_tlv));
561 		auth_len += pad_len;
562 
563 	}
564 	*packet = os_zalloc(*packet_len);
565 	if (!*packet)
566 		goto out;
567 
568 	pos = *packet;
569 	WPA_PUT_LE16(pos, auth_len);
570 	pos += 2;
571 	os_memcpy(pos, auth, auth_len);
572 	pos += auth_len;
573 	if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
574 			       auth_len, src_addr, type, pos) < 0)
575 		goto out;
576 	wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", *packet, *packet_len);
577 
578 	ret = 0;
579 
580 out:
581 	bin_clear_free(plain, plain_len);
582 	os_free(auth);
583 
584 	if (ret) {
585 		wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
586 		os_free(*packet);
587 		*packet = NULL;
588 		*packet_len = 0;
589 	}
590 
591 	return ret;
592 }
593 
594 
595 #define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
596 	if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
597 				&f_##field##_len, &f_##field) < 0 || \
598 	    (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
599 		wpa_printf(MSG_INFO, "FT: Missing required " #field \
600 			   " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
601 		wpa_ft_rrb_dump(srcfield, srcfield##_len); \
602 		goto out; \
603 	} \
604 } while (0)
605 
606 #define RRB_GET(type, field, txt, checklength) \
607 	RRB_GET_SRC(plain, type, field, txt, checklength)
608 #define RRB_GET_AUTH(type, field, txt, checklength) \
609 	RRB_GET_SRC(auth, type, field, txt, checklength)
610 
611 #define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
612 	if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
613 				&f_##field##_len, &f_##field) < 0 || \
614 	    (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
615 		wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
616 			   " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
617 		f_##field##_len = 0; \
618 		f_##field = NULL; \
619 	} \
620 } while (0)
621 
622 #define RRB_GET_OPTIONAL(type, field, txt, checklength) \
623 	RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
624 #define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
625 	RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)
626 
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)627 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
628 			   const u8 *data, size_t data_len)
629 {
630 	if (wpa_auth->cb->send_ether == NULL)
631 		return -1;
632 	wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
633 	return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
634 					data, data_len);
635 }
636 
637 
wpa_ft_rrb_oui_send(struct wpa_authenticator * wpa_auth,const u8 * dst,u8 oui_suffix,const u8 * data,size_t data_len)638 static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
639 			       const u8 *dst, u8 oui_suffix,
640 			       const u8 *data, size_t data_len)
641 {
642 	if (!wpa_auth->cb->send_oui)
643 		return -1;
644 	wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR " (len=%u)",
645 		   oui_suffix, MAC2STR(dst), (unsigned int) data_len);
646 	return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data,
647 				      data_len);
648 }
649 
650 
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)651 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
652 			      const u8 *dst, const u8 *data, size_t data_len)
653 {
654 	if (wpa_auth->cb->send_ft_action == NULL)
655 		return -1;
656 	return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
657 					    data, data_len);
658 }
659 
660 
wpa_ft_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)661 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
662 				 const u8 *addr, const u8 *p2p_dev_addr,
663 				 const u8 *prev_psk)
664 {
665 	if (wpa_auth->cb->get_psk == NULL)
666 		return NULL;
667 	return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
668 				     prev_psk, NULL, NULL);
669 }
670 
671 
672 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)673 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
674 {
675 	if (wpa_auth->cb->add_sta == NULL)
676 		return NULL;
677 	return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
678 }
679 
680 
wpa_ft_set_vlan(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,struct vlan_description * vlan)681 static int wpa_ft_set_vlan(struct wpa_authenticator *wpa_auth,
682 			   const u8 *sta_addr, struct vlan_description *vlan)
683 {
684 	if (!wpa_auth->cb->set_vlan)
685 		return -1;
686 	return wpa_auth->cb->set_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
687 }
688 
689 
wpa_ft_get_vlan(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,struct vlan_description * vlan)690 static int wpa_ft_get_vlan(struct wpa_authenticator *wpa_auth,
691 			   const u8 *sta_addr, struct vlan_description *vlan)
692 {
693 	if (!wpa_auth->cb->get_vlan)
694 		return -1;
695 	return wpa_auth->cb->get_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
696 }
697 
698 
699 static int
wpa_ft_set_identity(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * identity,size_t identity_len)700 wpa_ft_set_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
701 		    const u8 *identity, size_t identity_len)
702 {
703 	if (!wpa_auth->cb->set_identity)
704 		return -1;
705 	return wpa_auth->cb->set_identity(wpa_auth->cb_ctx, sta_addr, identity,
706 					  identity_len);
707 }
708 
709 
710 static size_t
wpa_ft_get_identity(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 ** buf)711 wpa_ft_get_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
712 		    const u8 **buf)
713 {
714 	*buf = NULL;
715 	if (!wpa_auth->cb->get_identity)
716 		return 0;
717 	return wpa_auth->cb->get_identity(wpa_auth->cb_ctx, sta_addr, buf);
718 }
719 
720 
721 static int
wpa_ft_set_radius_cui(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * radius_cui,size_t radius_cui_len)722 wpa_ft_set_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
723 		      const u8 *radius_cui, size_t radius_cui_len)
724 {
725 	if (!wpa_auth->cb->set_radius_cui)
726 		return -1;
727 	return wpa_auth->cb->set_radius_cui(wpa_auth->cb_ctx, sta_addr,
728 					    radius_cui, radius_cui_len);
729 }
730 
731 
732 static size_t
wpa_ft_get_radius_cui(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 ** buf)733 wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
734 		      const u8 **buf)
735 {
736 	*buf = NULL;
737 	if (!wpa_auth->cb->get_radius_cui)
738 		return 0;
739 	return wpa_auth->cb->get_radius_cui(wpa_auth->cb_ctx, sta_addr, buf);
740 }
741 
742 
743 static void
wpa_ft_set_session_timeout(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,int session_timeout)744 wpa_ft_set_session_timeout(struct wpa_authenticator *wpa_auth,
745 			    const u8 *sta_addr, int session_timeout)
746 {
747 	if (!wpa_auth->cb->set_session_timeout)
748 		return;
749 	wpa_auth->cb->set_session_timeout(wpa_auth->cb_ctx, sta_addr,
750 					  session_timeout);
751 }
752 
753 
754 static int
wpa_ft_get_session_timeout(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)755 wpa_ft_get_session_timeout(struct wpa_authenticator *wpa_auth,
756 			    const u8 *sta_addr)
757 {
758 	if (!wpa_auth->cb->get_session_timeout)
759 		return 0;
760 	return wpa_auth->cb->get_session_timeout(wpa_auth->cb_ctx, sta_addr);
761 }
762 
763 
wpa_ft_add_tspec(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,u8 * tspec_ie,size_t tspec_ielen)764 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
765 			    const u8 *sta_addr,
766 			    u8 *tspec_ie, size_t tspec_ielen)
767 {
768 	if (wpa_auth->cb->add_tspec == NULL) {
769 		wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
770 		return -1;
771 	}
772 	return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
773 				       tspec_ielen);
774 }
775 
776 
777 #ifdef CONFIG_OCV
wpa_channel_info(struct wpa_authenticator * wpa_auth,struct wpa_channel_info * ci)778 static int wpa_channel_info(struct wpa_authenticator *wpa_auth,
779 			       struct wpa_channel_info *ci)
780 {
781 	if (!wpa_auth->cb->channel_info)
782 		return -1;
783 	return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci);
784 }
785 #endif /* CONFIG_OCV */
786 
787 
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)788 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
789 {
790 	u8 *pos = buf;
791 	u8 capab;
792 	if (len < 2 + sizeof(struct rsn_mdie))
793 		return -1;
794 
795 	*pos++ = WLAN_EID_MOBILITY_DOMAIN;
796 	*pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
797 	os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
798 	pos += MOBILITY_DOMAIN_ID_LEN;
799 	capab = 0;
800 	if (conf->ft_over_ds)
801 		capab |= RSN_FT_CAPAB_FT_OVER_DS;
802 	*pos++ = capab;
803 
804 	return pos - buf;
805 }
806 
807 
wpa_write_ftie(struct wpa_auth_config * conf,int use_sha384,const u8 * r0kh_id,size_t r0kh_id_len,const u8 * anonce,const u8 * snonce,u8 * buf,size_t len,const u8 * subelem,size_t subelem_len,int rsnxe_used)808 int wpa_write_ftie(struct wpa_auth_config *conf, int use_sha384,
809 		   const u8 *r0kh_id, size_t r0kh_id_len,
810 		   const u8 *anonce, const u8 *snonce,
811 		   u8 *buf, size_t len, const u8 *subelem,
812 		   size_t subelem_len, int rsnxe_used)
813 {
814 	u8 *pos = buf, *ielen;
815 	size_t hdrlen = use_sha384 ? sizeof(struct rsn_ftie_sha384) :
816 		sizeof(struct rsn_ftie);
817 
818 	if (len < 2 + hdrlen + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
819 	    subelem_len)
820 		return -1;
821 
822 	*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
823 	ielen = pos++;
824 
825 	if (use_sha384) {
826 		struct rsn_ftie_sha384 *hdr = (struct rsn_ftie_sha384 *) pos;
827 
828 		os_memset(hdr, 0, sizeof(*hdr));
829 		pos += sizeof(*hdr);
830 		WPA_PUT_LE16(hdr->mic_control, !!rsnxe_used);
831 		if (anonce)
832 			os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
833 		if (snonce)
834 			os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
835 	} else {
836 		struct rsn_ftie *hdr = (struct rsn_ftie *) pos;
837 
838 		os_memset(hdr, 0, sizeof(*hdr));
839 		pos += sizeof(*hdr);
840 		WPA_PUT_LE16(hdr->mic_control, !!rsnxe_used);
841 		if (anonce)
842 			os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
843 		if (snonce)
844 			os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
845 	}
846 
847 	/* Optional Parameters */
848 	*pos++ = FTIE_SUBELEM_R1KH_ID;
849 	*pos++ = FT_R1KH_ID_LEN;
850 	os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
851 	pos += FT_R1KH_ID_LEN;
852 
853 	if (r0kh_id) {
854 		*pos++ = FTIE_SUBELEM_R0KH_ID;
855 		*pos++ = r0kh_id_len;
856 		os_memcpy(pos, r0kh_id, r0kh_id_len);
857 		pos += r0kh_id_len;
858 	}
859 
860 	if (subelem) {
861 		os_memcpy(pos, subelem, subelem_len);
862 		pos += subelem_len;
863 	}
864 
865 	*ielen = pos - buf - 2;
866 
867 	return pos - buf;
868 }
869 
870 
871 /* A packet to be handled after seq response */
872 struct ft_remote_item {
873 	struct dl_list list;
874 
875 	u8 nonce[FT_RRB_NONCE_LEN];
876 	struct os_reltime nonce_ts;
877 
878 	u8 src_addr[ETH_ALEN];
879 	u8 *enc;
880 	size_t enc_len;
881 	u8 *auth;
882 	size_t auth_len;
883 	int (*cb)(struct wpa_authenticator *wpa_auth,
884 		  const u8 *src_addr,
885 		  const u8 *enc, size_t enc_len,
886 		  const u8 *auth, size_t auth_len,
887 		  int no_defer);
888 };
889 
890 
wpa_ft_rrb_seq_free(struct ft_remote_item * item)891 static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
892 {
893 	eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
894 	dl_list_del(&item->list);
895 	bin_clear_free(item->enc, item->enc_len);
896 	os_free(item->auth);
897 	os_free(item);
898 }
899 
900 
wpa_ft_rrb_seq_flush(struct wpa_authenticator * wpa_auth,struct ft_remote_seq * rkh_seq,int cb)901 static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
902 				 struct ft_remote_seq *rkh_seq, int cb)
903 {
904 	struct ft_remote_item *item, *n;
905 
906 	dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
907 			      struct ft_remote_item, list) {
908 		if (cb && item->cb)
909 			item->cb(wpa_auth, item->src_addr, item->enc,
910 				 item->enc_len, item->auth, item->auth_len, 1);
911 		wpa_ft_rrb_seq_free(item);
912 	}
913 }
914 
915 
wpa_ft_rrb_seq_timeout(void * eloop_ctx,void * timeout_ctx)916 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
917 {
918 	struct ft_remote_item *item = timeout_ctx;
919 
920 	wpa_ft_rrb_seq_free(item);
921 }
922 
923 
924 static int
wpa_ft_rrb_seq_req(struct wpa_authenticator * wpa_auth,struct ft_remote_seq * rkh_seq,const u8 * src_addr,const u8 * f_r0kh_id,size_t f_r0kh_id_len,const u8 * f_r1kh_id,const u8 * key,size_t key_len,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int (* cb)(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer))925 wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
926 		   struct ft_remote_seq *rkh_seq, const u8 *src_addr,
927 		   const u8 *f_r0kh_id, size_t f_r0kh_id_len,
928 		   const u8 *f_r1kh_id, const u8 *key, size_t key_len,
929 		   const u8 *enc, size_t enc_len,
930 		   const u8 *auth, size_t auth_len,
931 		   int (*cb)(struct wpa_authenticator *wpa_auth,
932 			     const u8 *src_addr,
933 			     const u8 *enc, size_t enc_len,
934 			     const u8 *auth, size_t auth_len,
935 			     int no_defer))
936 {
937 	struct ft_remote_item *item = NULL;
938 	u8 *packet = NULL;
939 	size_t packet_len;
940 	struct tlv_list seq_req_auth[] = {
941 		{ .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
942 		  .data = NULL /* to be filled: item->nonce */ },
943 		{ .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
944 		  .data = f_r0kh_id },
945 		{ .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
946 		  .data = f_r1kh_id },
947 		{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
948 	};
949 
950 	if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
951 		wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
952 		goto err;
953 	}
954 
955 	wpa_printf(MSG_DEBUG, "FT: Send sequence number request from " MACSTR
956 		   " to " MACSTR,
957 		   MAC2STR(wpa_auth->addr), MAC2STR(src_addr));
958 	item = os_zalloc(sizeof(*item));
959 	if (!item)
960 		goto err;
961 
962 	os_memcpy(item->src_addr, src_addr, ETH_ALEN);
963 	item->cb = cb;
964 
965 	if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
966 		wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
967 		goto err;
968 	}
969 
970 	if (os_get_reltime(&item->nonce_ts) < 0)
971 		goto err;
972 
973 	if (enc && enc_len > 0) {
974 		item->enc = os_memdup(enc, enc_len);
975 		item->enc_len = enc_len;
976 		if (!item->enc)
977 			goto err;
978 	}
979 
980 	if (auth && auth_len > 0) {
981 		item->auth = os_memdup(auth, auth_len);
982 		item->auth_len = auth_len;
983 		if (!item->auth)
984 			goto err;
985 	}
986 
987 	eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
988 			       wpa_auth, item);
989 
990 	seq_req_auth[0].data = item->nonce;
991 
992 	if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth, NULL,
993 			     wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
994 			     &packet, &packet_len) < 0) {
995 		item = NULL; /* some other seq resp might still accept this */
996 		goto err;
997 	}
998 
999 	dl_list_add(&rkh_seq->rx.queue, &item->list);
1000 
1001 	wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
1002 			    packet, packet_len);
1003 
1004 	os_free(packet);
1005 
1006 	return 0;
1007 err:
1008 	wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
1009 	if (item) {
1010 		os_free(item->auth);
1011 		bin_clear_free(item->enc, item->enc_len);
1012 		os_free(item);
1013 	}
1014 
1015 	return -1;
1016 }
1017 
1018 
1019 #define FT_RRB_SEQ_OK    0
1020 #define FT_RRB_SEQ_DROP  1
1021 #define FT_RRB_SEQ_DEFER 2
1022 
1023 static int
wpa_ft_rrb_seq_chk(struct ft_remote_seq * rkh_seq,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,const char * msgtype,int no_defer)1024 wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
1025 		   const u8 *enc, size_t enc_len,
1026 		   const u8 *auth, size_t auth_len,
1027 		   const char *msgtype, int no_defer)
1028 {
1029 	const u8 *f_seq;
1030 	size_t f_seq_len;
1031 	const struct ft_rrb_seq *msg_both;
1032 	u32 msg_seq, msg_off, rkh_off;
1033 	struct os_reltime now;
1034 	unsigned int i;
1035 
1036 	RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
1037 	wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
1038 	msg_both = (const struct ft_rrb_seq *) f_seq;
1039 
1040 	if (rkh_seq->rx.num_last == 0) {
1041 		/* first packet from remote */
1042 		goto defer;
1043 	}
1044 
1045 	if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
1046 		/* remote might have rebooted */
1047 		goto defer;
1048 	}
1049 
1050 	if (os_get_reltime(&now) == 0) {
1051 		u32 msg_ts_now_remote, msg_ts_off;
1052 		struct os_reltime now_remote;
1053 
1054 		os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
1055 		msg_ts_now_remote = now_remote.sec;
1056 		msg_ts_off = le_to_host32(msg_both->ts) -
1057 			(msg_ts_now_remote - ftRRBseqTimeout);
1058 		if (msg_ts_off > 2 * ftRRBseqTimeout)
1059 			goto defer;
1060 	}
1061 
1062 	msg_seq = le_to_host32(msg_both->seq);
1063 	rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
1064 	msg_off = msg_seq - rkh_off;
1065 	if (msg_off > 0xC0000000)
1066 		goto out; /* too old message, drop it */
1067 
1068 	if (msg_off <= 0x40000000) {
1069 		for (i = 0; i < rkh_seq->rx.num_last; i++) {
1070 			if (rkh_seq->rx.last[i] == msg_seq)
1071 				goto out; /* duplicate message, drop it */
1072 		}
1073 
1074 		return FT_RRB_SEQ_OK;
1075 	}
1076 
1077 defer:
1078 	if (no_defer)
1079 		goto out;
1080 
1081 	wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
1082 		   MACSTR, msgtype, MAC2STR(src_addr));
1083 
1084 	return FT_RRB_SEQ_DEFER;
1085 out:
1086 	wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
1087 		   msgtype, MAC2STR(src_addr));
1088 
1089 	return FT_RRB_SEQ_DROP;
1090 }
1091 
1092 
1093 static void
wpa_ft_rrb_seq_accept(struct wpa_authenticator * wpa_auth,struct ft_remote_seq * rkh_seq,const u8 * src_addr,const u8 * auth,size_t auth_len,const char * msgtype)1094 wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
1095 		      struct ft_remote_seq *rkh_seq, const u8 *src_addr,
1096 		      const u8 *auth, size_t auth_len,
1097 		      const char *msgtype)
1098 {
1099 	const u8 *f_seq;
1100 	size_t f_seq_len;
1101 	const struct ft_rrb_seq *msg_both;
1102 	u32 msg_seq, msg_off, min_off, rkh_off;
1103 	int minidx = 0;
1104 	unsigned int i;
1105 
1106 	RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
1107 	msg_both = (const struct ft_rrb_seq *) f_seq;
1108 
1109 	msg_seq = le_to_host32(msg_both->seq);
1110 
1111 	if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
1112 		rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
1113 		rkh_seq->rx.num_last++;
1114 		return;
1115 	}
1116 
1117 	rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
1118 	for (i = 0; i < rkh_seq->rx.num_last; i++) {
1119 		msg_off = rkh_seq->rx.last[i] - rkh_off;
1120 		min_off = rkh_seq->rx.last[minidx] - rkh_off;
1121 		if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
1122 			minidx = i;
1123 	}
1124 	rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
1125 	rkh_seq->rx.offsetidx = minidx;
1126 
1127 	return;
1128 out:
1129 	/* RRB_GET_AUTH should never fail here as
1130 	 * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
1131 	wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
1132 }
1133 
1134 
wpa_ft_new_seq(struct ft_remote_seq * rkh_seq,struct ft_rrb_seq * f_seq)1135 static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
1136 			  struct ft_rrb_seq *f_seq)
1137 {
1138 	struct os_reltime now;
1139 
1140 	if (os_get_reltime(&now) < 0)
1141 		return -1;
1142 
1143 	if (!rkh_seq->tx.dom) {
1144 		if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
1145 				     sizeof(rkh_seq->tx.seq))) {
1146 			wpa_printf(MSG_ERROR,
1147 				   "FT: Failed to get random data for sequence number initialization");
1148 			rkh_seq->tx.seq = now.usec;
1149 		}
1150 		if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
1151 				     sizeof(rkh_seq->tx.dom))) {
1152 			wpa_printf(MSG_ERROR,
1153 				   "FT: Failed to get random data for sequence number initialization");
1154 			rkh_seq->tx.dom = now.usec;
1155 		}
1156 		rkh_seq->tx.dom |= 1;
1157 	}
1158 
1159 	f_seq->dom = host_to_le32(rkh_seq->tx.dom);
1160 	f_seq->seq = host_to_le32(rkh_seq->tx.seq);
1161 	f_seq->ts = host_to_le32(now.sec);
1162 
1163 	rkh_seq->tx.seq++;
1164 
1165 	return 0;
1166 }
1167 
1168 
1169 struct wpa_ft_pmk_r0_sa {
1170 	struct dl_list list;
1171 	u8 pmk_r0[PMK_LEN_MAX];
1172 	size_t pmk_r0_len;
1173 	u8 pmk_r0_name[WPA_PMK_NAME_LEN];
1174 	u8 spa[ETH_ALEN];
1175 	int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
1176 	struct vlan_description *vlan;
1177 	os_time_t expiration; /* 0 for no expiration */
1178 	u8 *identity;
1179 	size_t identity_len;
1180 	u8 *radius_cui;
1181 	size_t radius_cui_len;
1182 	os_time_t session_timeout; /* 0 for no expiration */
1183 	/* TODO: radius_class, EAP type */
1184 	int pmk_r1_pushed;
1185 };
1186 
1187 struct wpa_ft_pmk_r1_sa {
1188 	struct dl_list list;
1189 	u8 pmk_r1[PMK_LEN_MAX];
1190 	size_t pmk_r1_len;
1191 	u8 pmk_r1_name[WPA_PMK_NAME_LEN];
1192 	u8 spa[ETH_ALEN];
1193 	int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
1194 	struct vlan_description *vlan;
1195 	u8 *identity;
1196 	size_t identity_len;
1197 	u8 *radius_cui;
1198 	size_t radius_cui_len;
1199 	os_time_t session_timeout; /* 0 for no expiration */
1200 	/* TODO: radius_class, EAP type */
1201 };
1202 
1203 struct wpa_ft_pmk_cache {
1204 	struct dl_list pmk_r0; /* struct wpa_ft_pmk_r0_sa */
1205 	struct dl_list pmk_r1; /* struct wpa_ft_pmk_r1_sa */
1206 };
1207 
1208 
1209 static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx);
1210 static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx);
1211 
1212 
wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa * r0)1213 static void wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa *r0)
1214 {
1215 	if (!r0)
1216 		return;
1217 
1218 	dl_list_del(&r0->list);
1219 	eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
1220 
1221 	os_memset(r0->pmk_r0, 0, PMK_LEN_MAX);
1222 	os_free(r0->vlan);
1223 	os_free(r0->identity);
1224 	os_free(r0->radius_cui);
1225 	os_free(r0);
1226 }
1227 
1228 
wpa_ft_expire_pmk_r0(void * eloop_ctx,void * timeout_ctx)1229 static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx)
1230 {
1231 	struct wpa_ft_pmk_r0_sa *r0 = eloop_ctx;
1232 	struct os_reltime now;
1233 	int expires_in;
1234 	int session_timeout;
1235 
1236 	os_get_reltime(&now);
1237 
1238 	if (!r0)
1239 		return;
1240 
1241 	expires_in = r0->expiration - now.sec;
1242 	session_timeout = r0->session_timeout - now.sec;
1243 	/* conditions to remove from cache:
1244 	 * a) r0->expiration is set and hit
1245 	 * -or-
1246 	 * b) r0->session_timeout is set and hit
1247 	 */
1248 	if ((!r0->expiration || expires_in > 0) &&
1249 	    (!r0->session_timeout || session_timeout > 0)) {
1250 		wpa_printf(MSG_ERROR,
1251 			   "FT: %s() called for non-expired entry %p",
1252 			   __func__, r0);
1253 		eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
1254 		if (r0->expiration && expires_in > 0)
1255 			eloop_register_timeout(expires_in + 1, 0,
1256 					       wpa_ft_expire_pmk_r0, r0, NULL);
1257 		if (r0->session_timeout && session_timeout > 0)
1258 			eloop_register_timeout(session_timeout + 1, 0,
1259 					       wpa_ft_expire_pmk_r0, r0, NULL);
1260 		return;
1261 	}
1262 
1263 	wpa_ft_free_pmk_r0(r0);
1264 }
1265 
1266 
wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa * r1)1267 static void wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa *r1)
1268 {
1269 	if (!r1)
1270 		return;
1271 
1272 	dl_list_del(&r1->list);
1273 	eloop_cancel_timeout(wpa_ft_expire_pmk_r1, r1, NULL);
1274 
1275 	os_memset(r1->pmk_r1, 0, PMK_LEN_MAX);
1276 	os_free(r1->vlan);
1277 	os_free(r1->identity);
1278 	os_free(r1->radius_cui);
1279 	os_free(r1);
1280 }
1281 
1282 
wpa_ft_expire_pmk_r1(void * eloop_ctx,void * timeout_ctx)1283 static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx)
1284 {
1285 	struct wpa_ft_pmk_r1_sa *r1 = eloop_ctx;
1286 
1287 	wpa_ft_free_pmk_r1(r1);
1288 }
1289 
1290 
wpa_ft_pmk_cache_init(void)1291 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
1292 {
1293 	struct wpa_ft_pmk_cache *cache;
1294 
1295 	cache = os_zalloc(sizeof(*cache));
1296 	if (cache) {
1297 		dl_list_init(&cache->pmk_r0);
1298 		dl_list_init(&cache->pmk_r1);
1299 	}
1300 
1301 	return cache;
1302 }
1303 
1304 
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)1305 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
1306 {
1307 	struct wpa_ft_pmk_r0_sa *r0, *r0prev;
1308 	struct wpa_ft_pmk_r1_sa *r1, *r1prev;
1309 
1310 	dl_list_for_each_safe(r0, r0prev, &cache->pmk_r0,
1311 			      struct wpa_ft_pmk_r0_sa, list)
1312 		wpa_ft_free_pmk_r0(r0);
1313 
1314 	dl_list_for_each_safe(r1, r1prev, &cache->pmk_r1,
1315 			      struct wpa_ft_pmk_r1_sa, list)
1316 		wpa_ft_free_pmk_r1(r1);
1317 
1318 	os_free(cache);
1319 }
1320 
1321 
wpa_ft_store_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0,size_t pmk_r0_len,const u8 * pmk_r0_name,int pairwise,const struct vlan_description * vlan,int expires_in,int session_timeout,const u8 * identity,size_t identity_len,const u8 * radius_cui,size_t radius_cui_len)1322 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
1323 			       const u8 *spa, const u8 *pmk_r0,
1324 			       size_t pmk_r0_len,
1325 			       const u8 *pmk_r0_name, int pairwise,
1326 			       const struct vlan_description *vlan,
1327 			       int expires_in, int session_timeout,
1328 			       const u8 *identity, size_t identity_len,
1329 			       const u8 *radius_cui, size_t radius_cui_len)
1330 {
1331 	struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1332 	struct wpa_ft_pmk_r0_sa *r0;
1333 	struct os_reltime now;
1334 
1335 	/* TODO: add limit on number of entries in cache */
1336 	os_get_reltime(&now);
1337 
1338 	r0 = os_zalloc(sizeof(*r0));
1339 	if (r0 == NULL)
1340 		return -1;
1341 
1342 	os_memcpy(r0->pmk_r0, pmk_r0, pmk_r0_len);
1343 	r0->pmk_r0_len = pmk_r0_len;
1344 	os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
1345 	os_memcpy(r0->spa, spa, ETH_ALEN);
1346 	r0->pairwise = pairwise;
1347 	if (expires_in > 0)
1348 		r0->expiration = now.sec + expires_in;
1349 	if (vlan && vlan->notempty) {
1350 		r0->vlan = os_zalloc(sizeof(*vlan));
1351 		if (!r0->vlan) {
1352 			bin_clear_free(r0, sizeof(*r0));
1353 			return -1;
1354 		}
1355 		*r0->vlan = *vlan;
1356 	}
1357 	if (identity) {
1358 		r0->identity = os_malloc(identity_len);
1359 		if (r0->identity) {
1360 			os_memcpy(r0->identity, identity, identity_len);
1361 			r0->identity_len = identity_len;
1362 		}
1363 	}
1364 	if (radius_cui) {
1365 		r0->radius_cui = os_malloc(radius_cui_len);
1366 		if (r0->radius_cui) {
1367 			os_memcpy(r0->radius_cui, radius_cui, radius_cui_len);
1368 			r0->radius_cui_len = radius_cui_len;
1369 		}
1370 	}
1371 	if (session_timeout > 0)
1372 		r0->session_timeout = now.sec + session_timeout;
1373 
1374 	dl_list_add(&cache->pmk_r0, &r0->list);
1375 	if (expires_in > 0)
1376 		eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0,
1377 				       r0, NULL);
1378 	if (session_timeout > 0)
1379 		eloop_register_timeout(session_timeout + 1, 0,
1380 				       wpa_ft_expire_pmk_r0, r0, NULL);
1381 
1382 	return 0;
1383 }
1384 
1385 
wpa_ft_fetch_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0_name,const struct wpa_ft_pmk_r0_sa ** r0_out)1386 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
1387 			       const u8 *spa, const u8 *pmk_r0_name,
1388 			       const struct wpa_ft_pmk_r0_sa **r0_out)
1389 {
1390 	struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1391 	struct wpa_ft_pmk_r0_sa *r0;
1392 	struct os_reltime now;
1393 
1394 	os_get_reltime(&now);
1395 	dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
1396 		if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
1397 		    os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
1398 				    WPA_PMK_NAME_LEN) == 0) {
1399 			*r0_out = r0;
1400 			return 0;
1401 		}
1402 	}
1403 
1404 	*r0_out = NULL;
1405 	return -1;
1406 }
1407 
1408 
wpa_ft_store_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1,size_t pmk_r1_len,const u8 * pmk_r1_name,int pairwise,const struct vlan_description * vlan,int expires_in,int session_timeout,const u8 * identity,size_t identity_len,const u8 * radius_cui,size_t radius_cui_len)1409 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
1410 			       const u8 *spa, const u8 *pmk_r1,
1411 			       size_t pmk_r1_len,
1412 			       const u8 *pmk_r1_name, int pairwise,
1413 			       const struct vlan_description *vlan,
1414 			       int expires_in, int session_timeout,
1415 			       const u8 *identity, size_t identity_len,
1416 			       const u8 *radius_cui, size_t radius_cui_len)
1417 {
1418 	struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1419 	int max_expires_in = wpa_auth->conf.r1_max_key_lifetime;
1420 	struct wpa_ft_pmk_r1_sa *r1;
1421 	struct os_reltime now;
1422 
1423 	/* TODO: limit on number of entries in cache */
1424 	os_get_reltime(&now);
1425 
1426 	if (max_expires_in && (max_expires_in < expires_in || expires_in == 0))
1427 		expires_in = max_expires_in;
1428 
1429 	r1 = os_zalloc(sizeof(*r1));
1430 	if (r1 == NULL)
1431 		return -1;
1432 
1433 	os_memcpy(r1->pmk_r1, pmk_r1, pmk_r1_len);
1434 	r1->pmk_r1_len = pmk_r1_len;
1435 	os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
1436 	os_memcpy(r1->spa, spa, ETH_ALEN);
1437 	r1->pairwise = pairwise;
1438 	if (vlan && vlan->notempty) {
1439 		r1->vlan = os_zalloc(sizeof(*vlan));
1440 		if (!r1->vlan) {
1441 			bin_clear_free(r1, sizeof(*r1));
1442 			return -1;
1443 		}
1444 		*r1->vlan = *vlan;
1445 	}
1446 	if (identity) {
1447 		r1->identity = os_malloc(identity_len);
1448 		if (r1->identity) {
1449 			os_memcpy(r1->identity, identity, identity_len);
1450 			r1->identity_len = identity_len;
1451 		}
1452 	}
1453 	if (radius_cui) {
1454 		r1->radius_cui = os_malloc(radius_cui_len);
1455 		if (r1->radius_cui) {
1456 			os_memcpy(r1->radius_cui, radius_cui, radius_cui_len);
1457 			r1->radius_cui_len = radius_cui_len;
1458 		}
1459 	}
1460 	if (session_timeout > 0)
1461 		r1->session_timeout = now.sec + session_timeout;
1462 
1463 	dl_list_add(&cache->pmk_r1, &r1->list);
1464 
1465 	if (expires_in > 0)
1466 		eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r1,
1467 				       r1, NULL);
1468 	if (session_timeout > 0)
1469 		eloop_register_timeout(session_timeout + 1, 0,
1470 				       wpa_ft_expire_pmk_r1, r1, NULL);
1471 
1472 	return 0;
1473 }
1474 
1475 
wpa_ft_fetch_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1_name,u8 * pmk_r1,size_t * pmk_r1_len,int * pairwise,struct vlan_description * vlan,const u8 ** identity,size_t * identity_len,const u8 ** radius_cui,size_t * radius_cui_len,int * session_timeout)1476 int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
1477 			const u8 *spa, const u8 *pmk_r1_name,
1478 			u8 *pmk_r1, size_t *pmk_r1_len, int *pairwise,
1479 			struct vlan_description *vlan,
1480 			const u8 **identity, size_t *identity_len,
1481 			const u8 **radius_cui, size_t *radius_cui_len,
1482 			int *session_timeout)
1483 {
1484 	struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1485 	struct wpa_ft_pmk_r1_sa *r1;
1486 	struct os_reltime now;
1487 
1488 	os_get_reltime(&now);
1489 
1490 	dl_list_for_each(r1, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) {
1491 		if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
1492 		    os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
1493 				    WPA_PMK_NAME_LEN) == 0) {
1494 			os_memcpy(pmk_r1, r1->pmk_r1, r1->pmk_r1_len);
1495 			*pmk_r1_len = r1->pmk_r1_len;
1496 			if (pairwise)
1497 				*pairwise = r1->pairwise;
1498 			if (vlan && r1->vlan)
1499 				*vlan = *r1->vlan;
1500 			if (vlan && !r1->vlan)
1501 				os_memset(vlan, 0, sizeof(*vlan));
1502 			if (identity && identity_len) {
1503 				*identity = r1->identity;
1504 				*identity_len = r1->identity_len;
1505 			}
1506 			if (radius_cui && radius_cui_len) {
1507 				*radius_cui = r1->radius_cui;
1508 				*radius_cui_len = r1->radius_cui_len;
1509 			}
1510 			if (session_timeout && r1->session_timeout > now.sec)
1511 				*session_timeout = r1->session_timeout -
1512 					now.sec;
1513 			else if (session_timeout && r1->session_timeout)
1514 				*session_timeout = 1;
1515 			else if (session_timeout)
1516 				*session_timeout = 0;
1517 			return 0;
1518 		}
1519 	}
1520 
1521 	return -1;
1522 }
1523 
1524 
wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh * r0kh)1525 static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
1526 {
1527 	if (r0kh->seq)
1528 		return 0;
1529 
1530 	r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
1531 	if (!r0kh->seq) {
1532 		wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
1533 		return -1;
1534 	}
1535 
1536 	dl_list_init(&r0kh->seq->rx.queue);
1537 
1538 	return 0;
1539 }
1540 
1541 
wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len,struct ft_remote_r0kh ** r0kh_out,struct ft_remote_r0kh ** r0kh_wildcard)1542 static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
1543 				   const u8 *f_r0kh_id, size_t f_r0kh_id_len,
1544 				   struct ft_remote_r0kh **r0kh_out,
1545 				   struct ft_remote_r0kh **r0kh_wildcard)
1546 {
1547 	struct ft_remote_r0kh *r0kh;
1548 
1549 	*r0kh_wildcard = NULL;
1550 	*r0kh_out = NULL;
1551 
1552 	if (wpa_auth->conf.r0kh_list)
1553 		r0kh = *wpa_auth->conf.r0kh_list;
1554 	else
1555 		r0kh = NULL;
1556 	for (; r0kh; r0kh = r0kh->next) {
1557 		if (r0kh->id_len == 1 && r0kh->id[0] == '*')
1558 			*r0kh_wildcard = r0kh;
1559 		if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
1560 		    os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
1561 			*r0kh_out = r0kh;
1562 	}
1563 
1564 	if (!*r0kh_out && !*r0kh_wildcard)
1565 		wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");
1566 
1567 	if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
1568 		*r0kh_out = NULL;
1569 }
1570 
1571 
wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh * r1kh)1572 static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
1573 {
1574 	if (r1kh->seq)
1575 		return 0;
1576 
1577 	r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
1578 	if (!r1kh->seq) {
1579 		wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
1580 		return -1;
1581 	}
1582 
1583 	dl_list_init(&r1kh->seq->rx.queue);
1584 
1585 	return 0;
1586 }
1587 
1588 
wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator * wpa_auth,const u8 * f_r1kh_id,struct ft_remote_r1kh ** r1kh_out,struct ft_remote_r1kh ** r1kh_wildcard)1589 static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
1590 				   const u8 *f_r1kh_id,
1591 				   struct ft_remote_r1kh **r1kh_out,
1592 				   struct ft_remote_r1kh **r1kh_wildcard)
1593 {
1594 	struct ft_remote_r1kh *r1kh;
1595 
1596 	*r1kh_wildcard = NULL;
1597 	*r1kh_out = NULL;
1598 
1599 	if (wpa_auth->conf.r1kh_list)
1600 		r1kh = *wpa_auth->conf.r1kh_list;
1601 	else
1602 		r1kh = NULL;
1603 	for (; r1kh; r1kh = r1kh->next) {
1604 		if (is_zero_ether_addr(r1kh->addr) &&
1605 		    is_zero_ether_addr(r1kh->id))
1606 			*r1kh_wildcard = r1kh;
1607 		if (f_r1kh_id &&
1608 		    os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
1609 			*r1kh_out = r1kh;
1610 	}
1611 
1612 	if (!*r1kh_out && !*r1kh_wildcard)
1613 		wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");
1614 
1615 	if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
1616 		*r1kh_out = NULL;
1617 }
1618 
1619 
wpa_ft_rrb_check_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len)1620 static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
1621 				 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1622 {
1623 	if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
1624 	    os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
1625 			    f_r0kh_id_len) != 0)
1626 		return -1;
1627 
1628 	return 0;
1629 }
1630 
1631 
wpa_ft_rrb_check_r1kh(struct wpa_authenticator * wpa_auth,const u8 * f_r1kh_id)1632 static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
1633 				 const u8 *f_r1kh_id)
1634 {
1635 	if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
1636 			    FT_R1KH_ID_LEN) != 0)
1637 		return -1;
1638 
1639 	return 0;
1640 }
1641 
1642 
wpa_ft_rrb_del_r0kh(void * eloop_ctx,void * timeout_ctx)1643 static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
1644 {
1645 	struct wpa_authenticator *wpa_auth = eloop_ctx;
1646 	struct ft_remote_r0kh *r0kh, *prev = NULL;
1647 
1648 	if (!wpa_auth->conf.r0kh_list)
1649 		return;
1650 
1651 	for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
1652 		if (r0kh == timeout_ctx)
1653 			break;
1654 		prev = r0kh;
1655 	}
1656 	if (!r0kh)
1657 		return;
1658 	if (prev)
1659 		prev->next = r0kh->next;
1660 	else
1661 		*wpa_auth->conf.r0kh_list = r0kh->next;
1662 	if (r0kh->seq)
1663 		wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1664 	os_free(r0kh->seq);
1665 	os_free(r0kh);
1666 }
1667 
1668 
wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh,int timeout)1669 static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
1670 				      struct ft_remote_r0kh *r0kh, int timeout)
1671 {
1672 	if (timeout > 0)
1673 		eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1674 					wpa_auth, r0kh);
1675 }
1676 
1677 
wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh,int timeout)1678 static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
1679 				    struct ft_remote_r0kh *r0kh, int timeout)
1680 {
1681 	eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);
1682 
1683 	if (timeout > 0)
1684 		eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1685 				       wpa_auth, r0kh);
1686 }
1687 
1688 
1689 static struct ft_remote_r0kh *
wpa_ft_rrb_add_r0kh(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh_wildcard,const u8 * src_addr,const u8 * r0kh_id,size_t id_len,int timeout)1690 wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
1691 		    struct ft_remote_r0kh *r0kh_wildcard,
1692 		    const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
1693 		    int timeout)
1694 {
1695 	struct ft_remote_r0kh *r0kh;
1696 
1697 	if (!wpa_auth->conf.r0kh_list)
1698 		return NULL;
1699 
1700 	r0kh = os_zalloc(sizeof(*r0kh));
1701 	if (!r0kh)
1702 		return NULL;
1703 
1704 	if (src_addr)
1705 		os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));
1706 
1707 	if (id_len > FT_R0KH_ID_MAX_LEN)
1708 		id_len = FT_R0KH_ID_MAX_LEN;
1709 	os_memcpy(r0kh->id, r0kh_id, id_len);
1710 	r0kh->id_len = id_len;
1711 
1712 	os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));
1713 
1714 	r0kh->next = *wpa_auth->conf.r0kh_list;
1715 	*wpa_auth->conf.r0kh_list = r0kh;
1716 
1717 	if (timeout > 0)
1718 		eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1719 				       wpa_auth, r0kh);
1720 
1721 	if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
1722 		return NULL;
1723 
1724 	return r0kh;
1725 }
1726 
1727 
wpa_ft_rrb_del_r1kh(void * eloop_ctx,void * timeout_ctx)1728 static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
1729 {
1730 	struct wpa_authenticator *wpa_auth = eloop_ctx;
1731 	struct ft_remote_r1kh *r1kh, *prev = NULL;
1732 
1733 	if (!wpa_auth->conf.r1kh_list)
1734 		return;
1735 
1736 	for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
1737 		if (r1kh == timeout_ctx)
1738 			break;
1739 		prev = r1kh;
1740 	}
1741 	if (!r1kh)
1742 		return;
1743 	if (prev)
1744 		prev->next = r1kh->next;
1745 	else
1746 		*wpa_auth->conf.r1kh_list = r1kh->next;
1747 	if (r1kh->seq)
1748 		wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1749 	os_free(r1kh->seq);
1750 	os_free(r1kh);
1751 }
1752 
1753 
wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator * wpa_auth,struct ft_remote_r1kh * r1kh,int timeout)1754 static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
1755 				      struct ft_remote_r1kh *r1kh, int timeout)
1756 {
1757 	if (timeout > 0)
1758 		eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1759 					wpa_auth, r1kh);
1760 }
1761 
1762 
1763 static struct ft_remote_r1kh *
wpa_ft_rrb_add_r1kh(struct wpa_authenticator * wpa_auth,struct ft_remote_r1kh * r1kh_wildcard,const u8 * src_addr,const u8 * r1kh_id,int timeout)1764 wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
1765 		    struct ft_remote_r1kh *r1kh_wildcard,
1766 		    const u8 *src_addr, const u8 *r1kh_id, int timeout)
1767 {
1768 	struct ft_remote_r1kh *r1kh;
1769 
1770 	if (!wpa_auth->conf.r1kh_list)
1771 		return NULL;
1772 
1773 	r1kh = os_zalloc(sizeof(*r1kh));
1774 	if (!r1kh)
1775 		return NULL;
1776 
1777 	os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
1778 	os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
1779 	os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
1780 	r1kh->next = *wpa_auth->conf.r1kh_list;
1781 	*wpa_auth->conf.r1kh_list = r1kh;
1782 
1783 	if (timeout > 0)
1784 		eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1785 				       wpa_auth, r1kh);
1786 
1787 	if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
1788 		return NULL;
1789 
1790 	return r1kh;
1791 }
1792 
1793 
wpa_ft_sta_deinit(struct wpa_state_machine * sm)1794 void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
1795 {
1796 	eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1797 }
1798 
1799 
wpa_ft_deinit_seq(struct wpa_authenticator * wpa_auth)1800 static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
1801 {
1802 	struct ft_remote_r0kh *r0kh;
1803 	struct ft_remote_r1kh *r1kh;
1804 
1805 	eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);
1806 
1807 	if (wpa_auth->conf.r0kh_list)
1808 		r0kh = *wpa_auth->conf.r0kh_list;
1809 	else
1810 		r0kh = NULL;
1811 	for (; r0kh; r0kh = r0kh->next) {
1812 		if (!r0kh->seq)
1813 			continue;
1814 		wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1815 		os_free(r0kh->seq);
1816 		r0kh->seq = NULL;
1817 	}
1818 
1819 	if (wpa_auth->conf.r1kh_list)
1820 		r1kh = *wpa_auth->conf.r1kh_list;
1821 	else
1822 		r1kh = NULL;
1823 	for (; r1kh; r1kh = r1kh->next) {
1824 		if (!r1kh->seq)
1825 			continue;
1826 		wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1827 		os_free(r1kh->seq);
1828 		r1kh->seq = NULL;
1829 	}
1830 }
1831 
1832 
wpa_ft_deinit_rkh_tmp(struct wpa_authenticator * wpa_auth)1833 static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
1834 {
1835 	struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
1836 	struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;
1837 
1838 	if (wpa_auth->conf.r0kh_list)
1839 		r0kh = *wpa_auth->conf.r0kh_list;
1840 	else
1841 		r0kh = NULL;
1842 	while (r0kh) {
1843 		r0kh_next = r0kh->next;
1844 		if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
1845 					 r0kh) > 0) {
1846 			if (r0kh_prev)
1847 				r0kh_prev->next = r0kh_next;
1848 			else
1849 				*wpa_auth->conf.r0kh_list = r0kh_next;
1850 			os_free(r0kh);
1851 		} else {
1852 			r0kh_prev = r0kh;
1853 		}
1854 		r0kh = r0kh_next;
1855 	}
1856 
1857 	if (wpa_auth->conf.r1kh_list)
1858 		r1kh = *wpa_auth->conf.r1kh_list;
1859 	else
1860 		r1kh = NULL;
1861 	while (r1kh) {
1862 		r1kh_next = r1kh->next;
1863 		if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
1864 					 r1kh) > 0) {
1865 			if (r1kh_prev)
1866 				r1kh_prev->next = r1kh_next;
1867 			else
1868 				*wpa_auth->conf.r1kh_list = r1kh_next;
1869 			os_free(r1kh);
1870 		} else {
1871 			r1kh_prev = r1kh;
1872 		}
1873 		r1kh = r1kh_next;
1874 	}
1875 }
1876 
1877 
wpa_ft_deinit(struct wpa_authenticator * wpa_auth)1878 void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
1879 {
1880 	wpa_ft_deinit_seq(wpa_auth);
1881 	wpa_ft_deinit_rkh_tmp(wpa_auth);
1882 }
1883 
1884 
wpa_ft_block_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len)1885 static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
1886 			      const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1887 {
1888 	struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1889 
1890 	if (!wpa_auth->conf.rkh_neg_timeout)
1891 		return;
1892 
1893 	wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
1894 			       &r0kh, &r0kh_wildcard);
1895 
1896 	if (!r0kh_wildcard) {
1897 		/* r0kh removed after neg_timeout and might need re-adding */
1898 		return;
1899 	}
1900 
1901 	wpa_hexdump(MSG_DEBUG, "FT: Temporarily block R0KH-ID",
1902 		    f_r0kh_id, f_r0kh_id_len);
1903 
1904 	if (r0kh) {
1905 		wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
1906 					wpa_auth->conf.rkh_neg_timeout);
1907 		os_memset(r0kh->addr, 0, ETH_ALEN);
1908 	} else
1909 		wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
1910 				    f_r0kh_id_len,
1911 				    wpa_auth->conf.rkh_neg_timeout);
1912 }
1913 
1914 
wpa_ft_expire_pull(void * eloop_ctx,void * timeout_ctx)1915 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
1916 {
1917 	struct wpa_state_machine *sm = eloop_ctx;
1918 
1919 	wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
1920 		   MAC2STR(sm->addr));
1921 	if (sm->ft_pending_pull_left_retries <= 0)
1922 		wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);
1923 
1924 	/* cancel multiple timeouts */
1925 	eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1926 	ft_finish_pull(sm);
1927 }
1928 
1929 
wpa_ft_pull_pmk_r1(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * pmk_r0_name)1930 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
1931 			      const u8 *ies, size_t ies_len,
1932 			      const u8 *pmk_r0_name)
1933 {
1934 	struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1935 	u8 *packet = NULL;
1936 	const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
1937 	size_t packet_len, key_len;
1938 	struct ft_rrb_seq f_seq;
1939 	int tsecs, tusecs, first;
1940 	struct wpabuf *ft_pending_req_ies;
1941 	int r0kh_timeout;
1942 	struct tlv_list req_enc[] = {
1943 		{ .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
1944 		  .data = pmk_r0_name },
1945 		{ .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
1946 		  .data = sm->addr },
1947 		{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1948 	};
1949 	struct tlv_list req_auth[] = {
1950 		{ .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
1951 		  .data = sm->ft_pending_pull_nonce },
1952 		{ .type = FT_RRB_SEQ, .len = sizeof(f_seq),
1953 		  .data = (u8 *) &f_seq },
1954 		{ .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
1955 		  .data = sm->r0kh_id },
1956 		{ .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
1957 		  .data = f_r1kh_id },
1958 		{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1959 	};
1960 
1961 	if (sm->ft_pending_pull_left_retries <= 0)
1962 		return -1;
1963 	first = sm->ft_pending_pull_left_retries ==
1964 		sm->wpa_auth->conf.rkh_pull_retries;
1965 	sm->ft_pending_pull_left_retries--;
1966 
1967 	wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
1968 			       &r0kh, &r0kh_wildcard);
1969 
1970 	/* Keep r0kh sufficiently long in the list for seq num check */
1971 	r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
1972 		1 + ftRRBseqTimeout;
1973 	if (r0kh) {
1974 		wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
1975 	} else if (r0kh_wildcard) {
1976 		wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
1977 		/* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
1978 		r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
1979 					   r0kh_wildcard->addr,
1980 					   sm->r0kh_id, sm->r0kh_id_len,
1981 					   r0kh_timeout);
1982 	}
1983 	if (r0kh == NULL) {
1984 		wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
1985 			    sm->r0kh_id, sm->r0kh_id_len);
1986 		return -1;
1987 	}
1988 	if (is_zero_ether_addr(r0kh->addr)) {
1989 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is temporarily blocked",
1990 			    sm->r0kh_id, sm->r0kh_id_len);
1991 		return -1;
1992 	}
1993 	if (os_memcmp(r0kh->addr, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1994 		wpa_printf(MSG_DEBUG,
1995 			   "FT: R0KH-ID points to self - no matching key available");
1996 		return -1;
1997 	}
1998 
1999 	key = r0kh->key;
2000 	key_len = sizeof(r0kh->key);
2001 
2002 	if (r0kh->seq->rx.num_last == 0) {
2003 		/* A sequence request will be sent out anyway when pull
2004 		 * response is received. Send it out now to avoid one RTT. */
2005 		wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
2006 				   r0kh->id, r0kh->id_len, f_r1kh_id, key,
2007 				   key_len, NULL, 0, NULL, 0, NULL);
2008 	}
2009 
2010 	wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request from " MACSTR
2011 		   " to remote R0KH address " MACSTR,
2012 		   MAC2STR(sm->wpa_auth->addr), MAC2STR(r0kh->addr));
2013 
2014 	if (first &&
2015 	    random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
2016 		wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
2017 			   "nonce");
2018 		return -1;
2019 	}
2020 
2021 	if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
2022 		wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
2023 		return -1;
2024 	}
2025 
2026 	if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth, NULL,
2027 			     sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
2028 			     &packet, &packet_len) < 0)
2029 		return -1;
2030 
2031 	ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
2032 	wpabuf_free(sm->ft_pending_req_ies);
2033 	sm->ft_pending_req_ies = ft_pending_req_ies;
2034 	if (!sm->ft_pending_req_ies) {
2035 		os_free(packet);
2036 		return -1;
2037 	}
2038 
2039 	tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
2040 	tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
2041 	eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);
2042 
2043 	wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
2044 			    packet, packet_len);
2045 
2046 	os_free(packet);
2047 
2048 	return 0;
2049 }
2050 
2051 
wpa_ft_store_pmk_fils(struct wpa_state_machine * sm,const u8 * pmk_r0,const u8 * pmk_r0_name)2052 int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
2053 			  const u8 *pmk_r0, const u8 *pmk_r0_name)
2054 {
2055 	int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
2056 	struct vlan_description vlan;
2057 	const u8 *identity, *radius_cui;
2058 	size_t identity_len, radius_cui_len;
2059 	int session_timeout;
2060 	size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
2061 		SHA384_MAC_LEN : PMK_LEN;
2062 
2063 	if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2064 		wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
2065 			   MAC2STR(sm->addr));
2066 		return -1;
2067 	}
2068 
2069 	identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
2070 	radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
2071 					       &radius_cui);
2072 	session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
2073 
2074 	return wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
2075 				   pmk_r0_name, sm->pairwise, &vlan, expires_in,
2076 				   session_timeout, identity, identity_len,
2077 				   radius_cui, radius_cui_len);
2078 }
2079 
2080 
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,struct wpa_ptk * ptk)2081 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, struct wpa_ptk *ptk)
2082 {
2083 	u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
2084 	size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
2085 		SHA384_MAC_LEN : PMK_LEN;
2086 	size_t pmk_r1_len = pmk_r0_len;
2087 	u8 pmk_r1[PMK_LEN_MAX];
2088 	u8 ptk_name[WPA_PMK_NAME_LEN];
2089 	const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
2090 	const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
2091 	size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
2092 	const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
2093 	const u8 *ssid = sm->wpa_auth->conf.ssid;
2094 	size_t ssid_len = sm->wpa_auth->conf.ssid_len;
2095 	int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
2096 	int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
2097 	struct vlan_description vlan;
2098 	const u8 *identity, *radius_cui;
2099 	size_t identity_len, radius_cui_len;
2100 	int session_timeout;
2101 	const u8 *mpmk;
2102 	size_t mpmk_len;
2103 
2104 	if (sm->xxkey_len > 0) {
2105 		mpmk = sm->xxkey;
2106 		mpmk_len = sm->xxkey_len;
2107 	} else if (sm->pmksa) {
2108 		mpmk = sm->pmksa->pmk;
2109 		mpmk_len = sm->pmksa->pmk_len;
2110 	} else {
2111 		wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
2112 			   "derivation");
2113 		return -1;
2114 	}
2115 
2116 	if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2117 		wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
2118 			   MAC2STR(sm->addr));
2119 		return -1;
2120 	}
2121 
2122 	identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
2123 	radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
2124 					       &radius_cui);
2125 	session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
2126 
2127 	if (wpa_derive_pmk_r0(mpmk, mpmk_len, ssid, ssid_len, mdid,
2128 			      r0kh, r0kh_len, sm->addr,
2129 			      pmk_r0, pmk_r0_name,
2130 			      wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) < 0)
2131 		return -1;
2132 	if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
2133 		wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
2134 				    pmk_r0_name,
2135 				    sm->pairwise, &vlan, expires_in,
2136 				    session_timeout, identity, identity_len,
2137 				    radius_cui, radius_cui_len);
2138 
2139 	if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_len, pmk_r0_name, r1kh, sm->addr,
2140 			      pmk_r1, sm->pmk_r1_name) < 0)
2141 		return -1;
2142 	if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
2143 		wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_len,
2144 				    sm->pmk_r1_name, sm->pairwise, &vlan,
2145 				    expires_in, session_timeout, identity,
2146 				    identity_len, radius_cui, radius_cui_len);
2147 
2148 	return wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
2149 				 sm->addr, sm->wpa_auth->addr, sm->pmk_r1_name,
2150 				 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise,
2151 				 0);
2152 }
2153 
2154 
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)2155 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
2156 				      const u8 *addr, int idx, u8 *seq)
2157 {
2158 	if (wpa_auth->cb->get_seqnum == NULL)
2159 		return -1;
2160 	return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
2161 }
2162 
2163 
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)2164 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
2165 {
2166 	u8 *subelem;
2167 	struct wpa_auth_config *conf = &sm->wpa_auth->conf;
2168 	struct wpa_group *gsm = sm->group;
2169 	size_t subelem_len, pad_len;
2170 	const u8 *key;
2171 	size_t key_len;
2172 	u8 keybuf[WPA_GTK_MAX_LEN];
2173 	const u8 *kek;
2174 	size_t kek_len;
2175 
2176 	if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2177 		kek = sm->PTK.kek2;
2178 		kek_len = sm->PTK.kek2_len;
2179 	} else {
2180 		kek = sm->PTK.kek;
2181 		kek_len = sm->PTK.kek_len;
2182 	}
2183 
2184 	key_len = gsm->GTK_len;
2185 	if (key_len > sizeof(keybuf))
2186 		return NULL;
2187 
2188 	/*
2189 	 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
2190 	 * than 16 bytes.
2191 	 */
2192 	pad_len = key_len % 8;
2193 	if (pad_len)
2194 		pad_len = 8 - pad_len;
2195 	if (key_len + pad_len < 16)
2196 		pad_len += 8;
2197 	if (pad_len && key_len < sizeof(keybuf)) {
2198 		os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
2199 		if (conf->disable_gtk ||
2200 		    sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
2201 			/*
2202 			 * Provide unique random GTK to each STA to prevent use
2203 			 * of GTK in the BSS.
2204 			 */
2205 			if (random_get_bytes(keybuf, key_len) < 0)
2206 				return NULL;
2207 		}
2208 		os_memset(keybuf + key_len, 0, pad_len);
2209 		keybuf[key_len] = 0xdd;
2210 		key_len += pad_len;
2211 		key = keybuf;
2212 	} else if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
2213 		/*
2214 		 * Provide unique random GTK to each STA to prevent use of GTK
2215 		 * in the BSS.
2216 		 */
2217 		if (random_get_bytes(keybuf, key_len) < 0)
2218 			return NULL;
2219 		key = keybuf;
2220 	} else {
2221 		key = gsm->GTK[gsm->GN - 1];
2222 	}
2223 
2224 	/*
2225 	 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2226 	 * Key[5..32].
2227 	 */
2228 	subelem_len = 13 + key_len + 8;
2229 	subelem = os_zalloc(subelem_len);
2230 	if (subelem == NULL)
2231 		return NULL;
2232 
2233 	subelem[0] = FTIE_SUBELEM_GTK;
2234 	subelem[1] = 11 + key_len + 8;
2235 	/* Key ID in B0-B1 of Key Info */
2236 	WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
2237 	subelem[4] = gsm->GTK_len;
2238 	wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
2239 	if (aes_wrap(kek, kek_len, key_len / 8, key, subelem + 13)) {
2240 		wpa_printf(MSG_DEBUG,
2241 			   "FT: GTK subelem encryption failed: kek_len=%d",
2242 			   (int) kek_len);
2243 		os_free(subelem);
2244 		return NULL;
2245 	}
2246 
2247 	forced_memzero(keybuf, sizeof(keybuf));
2248 	*len = subelem_len;
2249 	return subelem;
2250 }
2251 
2252 
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)2253 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
2254 {
2255 	u8 *subelem, *pos;
2256 	struct wpa_auth_config *conf = &sm->wpa_auth->conf;
2257 	struct wpa_group *gsm = sm->group;
2258 	size_t subelem_len;
2259 	const u8 *kek, *igtk;
2260 	size_t kek_len;
2261 	size_t igtk_len;
2262 	u8 dummy_igtk[WPA_IGTK_MAX_LEN];
2263 
2264 	if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2265 		kek = sm->PTK.kek2;
2266 		kek_len = sm->PTK.kek2_len;
2267 	} else {
2268 		kek = sm->PTK.kek;
2269 		kek_len = sm->PTK.kek_len;
2270 	}
2271 
2272 	igtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2273 
2274 	/* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
2275 	 * Key[16+8] */
2276 	subelem_len = 1 + 1 + 2 + 6 + 1 + igtk_len + 8;
2277 	subelem = os_zalloc(subelem_len);
2278 	if (subelem == NULL)
2279 		return NULL;
2280 
2281 	pos = subelem;
2282 	*pos++ = FTIE_SUBELEM_IGTK;
2283 	*pos++ = subelem_len - 2;
2284 	WPA_PUT_LE16(pos, gsm->GN_igtk);
2285 	pos += 2;
2286 	wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
2287 	pos += 6;
2288 	*pos++ = igtk_len;
2289 	igtk = gsm->IGTK[gsm->GN_igtk - 4];
2290 	if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
2291 		/*
2292 		 * Provide unique random IGTK to each STA to prevent use of
2293 		 * IGTK in the BSS.
2294 		 */
2295 		if (random_get_bytes(dummy_igtk, igtk_len / 8) < 0) {
2296 			os_free(subelem);
2297 			return NULL;
2298 		}
2299 		igtk = dummy_igtk;
2300 	}
2301 	if (aes_wrap(kek, kek_len, igtk_len / 8, igtk, pos)) {
2302 		wpa_printf(MSG_DEBUG,
2303 			   "FT: IGTK subelem encryption failed: kek_len=%d",
2304 			   (int) kek_len);
2305 		os_free(subelem);
2306 		return NULL;
2307 	}
2308 
2309 	*len = subelem_len;
2310 	return subelem;
2311 }
2312 
2313 
wpa_ft_bigtk_subelem(struct wpa_state_machine * sm,size_t * len)2314 static u8 * wpa_ft_bigtk_subelem(struct wpa_state_machine *sm, size_t *len)
2315 {
2316 	u8 *subelem, *pos;
2317 	struct wpa_group *gsm = sm->group;
2318 	size_t subelem_len;
2319 	const u8 *kek, *bigtk;
2320 	size_t kek_len;
2321 	size_t bigtk_len;
2322 	u8 dummy_bigtk[WPA_IGTK_MAX_LEN];
2323 
2324 	if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2325 		kek = sm->PTK.kek2;
2326 		kek_len = sm->PTK.kek2_len;
2327 	} else {
2328 		kek = sm->PTK.kek;
2329 		kek_len = sm->PTK.kek_len;
2330 	}
2331 
2332 	bigtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2333 
2334 	/* Sub-elem ID[1] | Length[1] | KeyID[2] | BIPN[6] | Key Length[1] |
2335 	 * Key[16+8] */
2336 	subelem_len = 1 + 1 + 2 + 6 + 1 + bigtk_len + 8;
2337 	subelem = os_zalloc(subelem_len);
2338 	if (subelem == NULL)
2339 		return NULL;
2340 
2341 	pos = subelem;
2342 	*pos++ = FTIE_SUBELEM_BIGTK;
2343 	*pos++ = subelem_len - 2;
2344 	WPA_PUT_LE16(pos, gsm->GN_bigtk);
2345 	pos += 2;
2346 	wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_bigtk, pos);
2347 	pos += 6;
2348 	*pos++ = bigtk_len;
2349 	bigtk = gsm->IGTK[gsm->GN_bigtk - 6];
2350 	if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
2351 		/*
2352 		 * Provide unique random BIGTK to each OSEN STA to prevent use
2353 		 * of BIGTK in the BSS.
2354 		 */
2355 		if (random_get_bytes(dummy_bigtk, bigtk_len / 8) < 0) {
2356 			os_free(subelem);
2357 			return NULL;
2358 		}
2359 		bigtk = dummy_bigtk;
2360 	}
2361 	if (aes_wrap(kek, kek_len, bigtk_len / 8, bigtk, pos)) {
2362 		wpa_printf(MSG_DEBUG,
2363 			   "FT: BIGTK subelem encryption failed: kek_len=%d",
2364 			   (int) kek_len);
2365 		os_free(subelem);
2366 		return NULL;
2367 	}
2368 
2369 	*len = subelem_len;
2370 	return subelem;
2371 }
2372 
2373 
wpa_ft_process_rdie(struct wpa_state_machine * sm,u8 * pos,u8 * end,u8 id,u8 descr_count,const u8 * ies,size_t ies_len)2374 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
2375 				u8 *pos, u8 *end, u8 id, u8 descr_count,
2376 				const u8 *ies, size_t ies_len)
2377 {
2378 	struct ieee802_11_elems parse;
2379 	struct rsn_rdie *rdie;
2380 
2381 	wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
2382 		   id, descr_count);
2383 	wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
2384 		    ies, ies_len);
2385 
2386 	if (end - pos < (int) sizeof(*rdie)) {
2387 		wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
2388 		return pos;
2389 	}
2390 
2391 	*pos++ = WLAN_EID_RIC_DATA;
2392 	*pos++ = sizeof(*rdie);
2393 	rdie = (struct rsn_rdie *) pos;
2394 	rdie->id = id;
2395 	rdie->descr_count = 0;
2396 	rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
2397 	pos += sizeof(*rdie);
2398 
2399 	if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
2400 	    ParseFailed) {
2401 		wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
2402 		rdie->status_code =
2403 			host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2404 		return pos;
2405 	}
2406 
2407 	if (parse.wmm_tspec) {
2408 		struct wmm_tspec_element *tspec;
2409 
2410 		if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
2411 			wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
2412 				   "(%d)", (int) parse.wmm_tspec_len);
2413 			rdie->status_code =
2414 				host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2415 			return pos;
2416 		}
2417 		if (end - pos < (int) sizeof(*tspec)) {
2418 			wpa_printf(MSG_ERROR, "FT: Not enough room for "
2419 				   "response TSPEC");
2420 			rdie->status_code =
2421 				host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2422 			return pos;
2423 		}
2424 		tspec = (struct wmm_tspec_element *) pos;
2425 		os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
2426 	}
2427 
2428 #ifdef NEED_AP_MLME
2429 	if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
2430 		int res;
2431 
2432 		res = wmm_process_tspec((struct wmm_tspec_element *) pos);
2433 		wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
2434 		if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
2435 			rdie->status_code =
2436 				host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
2437 		else if (res == WMM_ADDTS_STATUS_REFUSED)
2438 			rdie->status_code =
2439 				host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
2440 		else {
2441 			/* TSPEC accepted; include updated TSPEC in response */
2442 			rdie->descr_count = 1;
2443 			pos += sizeof(struct wmm_tspec_element);
2444 		}
2445 		return pos;
2446 	}
2447 #endif /* NEED_AP_MLME */
2448 
2449 	if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
2450 		int res;
2451 
2452 		res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
2453 				       sizeof(struct wmm_tspec_element));
2454 		if (res >= 0) {
2455 			if (res)
2456 				rdie->status_code = host_to_le16(res);
2457 			else {
2458 				/* TSPEC accepted; include updated TSPEC in
2459 				 * response */
2460 				rdie->descr_count = 1;
2461 				pos += sizeof(struct wmm_tspec_element);
2462 			}
2463 			return pos;
2464 		}
2465 	}
2466 
2467 	wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
2468 	rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2469 	return pos;
2470 }
2471 
2472 
wpa_ft_process_ric(struct wpa_state_machine * sm,u8 * pos,u8 * end,const u8 * ric,size_t ric_len)2473 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
2474 			       const u8 *ric, size_t ric_len)
2475 {
2476 	const u8 *rpos, *start;
2477 	const struct rsn_rdie *rdie;
2478 
2479 	wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
2480 
2481 	rpos = ric;
2482 	while (rpos + sizeof(*rdie) < ric + ric_len) {
2483 		if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
2484 		    rpos + 2 + rpos[1] > ric + ric_len)
2485 			break;
2486 		rdie = (const struct rsn_rdie *) (rpos + 2);
2487 		rpos += 2 + rpos[1];
2488 		start = rpos;
2489 
2490 		while (rpos + 2 <= ric + ric_len &&
2491 		       rpos + 2 + rpos[1] <= ric + ric_len) {
2492 			if (rpos[0] == WLAN_EID_RIC_DATA)
2493 				break;
2494 			rpos += 2 + rpos[1];
2495 		}
2496 		pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
2497 					  rdie->descr_count,
2498 					  start, rpos - start);
2499 	}
2500 
2501 	return pos;
2502 }
2503 
2504 
wpa_sm_write_assoc_resp_ies(struct wpa_state_machine * sm,u8 * pos,size_t max_len,int auth_alg,const u8 * req_ies,size_t req_ies_len,int omit_rsnxe)2505 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
2506 				 size_t max_len, int auth_alg,
2507 				 const u8 *req_ies, size_t req_ies_len,
2508 				 int omit_rsnxe)
2509 {
2510 	u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
2511 	u8 *fte_mic, *elem_count;
2512 	size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
2513 	u8 rsnxe_buf[10], *rsnxe = rsnxe_buf;
2514 	size_t rsnxe_len;
2515 	int rsnxe_used;
2516 	int res;
2517 	struct wpa_auth_config *conf;
2518 	struct wpa_ft_ies parse;
2519 	u8 *ric_start;
2520 	u8 *anonce, *snonce;
2521 	const u8 *kck;
2522 	size_t kck_len;
2523 	int use_sha384;
2524 
2525 	if (sm == NULL)
2526 		return pos;
2527 
2528 	use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
2529 	conf = &sm->wpa_auth->conf;
2530 
2531 	if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2532 		return pos;
2533 
2534 	end = pos + max_len;
2535 
2536 #ifdef CONFIG_TESTING_OPTIONS
2537 	if (auth_alg == WLAN_AUTH_FT &&
2538 	    sm->wpa_auth->conf.rsne_override_ft_set) {
2539 		wpa_printf(MSG_DEBUG,
2540 			   "TESTING: RSNE FT override for MIC calculation");
2541 		rsnie = sm->wpa_auth->conf.rsne_override_ft;
2542 		rsnie_len = sm->wpa_auth->conf.rsne_override_ft_len;
2543 		if (end - pos < (long int) rsnie_len)
2544 			return pos;
2545 		os_memcpy(pos, rsnie, rsnie_len);
2546 		rsnie = pos;
2547 		pos += rsnie_len;
2548 		if (rsnie_len > PMKID_LEN && sm->pmk_r1_name_valid) {
2549 			int idx;
2550 
2551 			/* Replace all 0xff PMKID with the valid PMKR1Name */
2552 			for (idx = 0; idx < PMKID_LEN; idx++) {
2553 				if (rsnie[rsnie_len - 1 - idx] != 0xff)
2554 					break;
2555 			}
2556 			if (idx == PMKID_LEN)
2557 				os_memcpy(&rsnie[rsnie_len - PMKID_LEN],
2558 					  sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2559 		}
2560 	} else
2561 #endif /* CONFIG_TESTING_OPTIONS */
2562 	if (auth_alg == WLAN_AUTH_FT ||
2563 	    ((auth_alg == WLAN_AUTH_FILS_SK ||
2564 	      auth_alg == WLAN_AUTH_FILS_SK_PFS ||
2565 	      auth_alg == WLAN_AUTH_FILS_PK) &&
2566 	     (sm->wpa_key_mgmt & (WPA_KEY_MGMT_FT_FILS_SHA256 |
2567 				  WPA_KEY_MGMT_FT_FILS_SHA384)))) {
2568 		if (!sm->pmk_r1_name_valid) {
2569 			wpa_printf(MSG_ERROR,
2570 				   "FT: PMKR1Name is not valid for Assoc Resp RSNE");
2571 			return NULL;
2572 		}
2573 		wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name for Assoc Resp RSNE",
2574 			    sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2575 		/*
2576 		 * RSN (only present if this is a Reassociation Response and
2577 		 * part of a fast BSS transition; or if this is a
2578 		 * (Re)Association Response frame during an FT initial mobility
2579 		 * domain association using FILS)
2580 		 */
2581 		res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
2582 		if (res < 0)
2583 			return NULL;
2584 		rsnie = pos;
2585 		rsnie_len = res;
2586 		pos += res;
2587 	}
2588 
2589 	/* Mobility Domain Information */
2590 	res = wpa_write_mdie(conf, pos, end - pos);
2591 	if (res < 0)
2592 		return NULL;
2593 	mdie = pos;
2594 	mdie_len = res;
2595 	pos += res;
2596 
2597 	/* Fast BSS Transition Information */
2598 	if (auth_alg == WLAN_AUTH_FT) {
2599 		subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
2600 		if (!subelem) {
2601 			wpa_printf(MSG_DEBUG,
2602 				   "FT: Failed to add GTK subelement");
2603 			return NULL;
2604 		}
2605 		r0kh_id = sm->r0kh_id;
2606 		r0kh_id_len = sm->r0kh_id_len;
2607 		anonce = sm->ANonce;
2608 		snonce = sm->SNonce;
2609 		if (sm->mgmt_frame_prot) {
2610 			u8 *igtk;
2611 			size_t igtk_len;
2612 			u8 *nbuf;
2613 			igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
2614 			if (igtk == NULL) {
2615 				wpa_printf(MSG_DEBUG,
2616 					   "FT: Failed to add IGTK subelement");
2617 				os_free(subelem);
2618 				return NULL;
2619 			}
2620 			nbuf = os_realloc(subelem, subelem_len + igtk_len);
2621 			if (nbuf == NULL) {
2622 				os_free(subelem);
2623 				os_free(igtk);
2624 				return NULL;
2625 			}
2626 			subelem = nbuf;
2627 			os_memcpy(subelem + subelem_len, igtk, igtk_len);
2628 			subelem_len += igtk_len;
2629 			os_free(igtk);
2630 		}
2631 		if (sm->mgmt_frame_prot && conf->beacon_prot) {
2632 			u8 *bigtk;
2633 			size_t bigtk_len;
2634 			u8 *nbuf;
2635 
2636 			bigtk = wpa_ft_bigtk_subelem(sm, &bigtk_len);
2637 			if (!bigtk) {
2638 				wpa_printf(MSG_DEBUG,
2639 					   "FT: Failed to add BIGTK subelement");
2640 				os_free(subelem);
2641 				return NULL;
2642 			}
2643 			nbuf = os_realloc(subelem, subelem_len + bigtk_len);
2644 			if (!nbuf) {
2645 				os_free(subelem);
2646 				os_free(bigtk);
2647 				return NULL;
2648 			}
2649 			subelem = nbuf;
2650 			os_memcpy(subelem + subelem_len, bigtk, bigtk_len);
2651 			subelem_len += bigtk_len;
2652 			os_free(bigtk);
2653 		}
2654 #ifdef CONFIG_OCV
2655 		if (wpa_auth_uses_ocv(sm)) {
2656 			struct wpa_channel_info ci;
2657 			u8 *nbuf, *ocipos;
2658 
2659 			if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
2660 				wpa_printf(MSG_WARNING,
2661 					   "Failed to get channel info for OCI element");
2662 				os_free(subelem);
2663 				return NULL;
2664 			}
2665 #ifdef CONFIG_TESTING_OPTIONS
2666 			if (conf->oci_freq_override_ft_assoc) {
2667 				wpa_printf(MSG_INFO,
2668 					   "TEST: Override OCI frequency %d -> %u MHz",
2669 					   ci.frequency,
2670 					   conf->oci_freq_override_ft_assoc);
2671 				ci.frequency = conf->oci_freq_override_ft_assoc;
2672 			}
2673 #endif /* CONFIG_TESTING_OPTIONS */
2674 
2675 			subelem_len += 2 + OCV_OCI_LEN;
2676 			nbuf = os_realloc(subelem, subelem_len);
2677 			if (!nbuf) {
2678 				os_free(subelem);
2679 				return NULL;
2680 			}
2681 			subelem = nbuf;
2682 
2683 			ocipos = subelem + subelem_len - 2 - OCV_OCI_LEN;
2684 			*ocipos++ = FTIE_SUBELEM_OCI;
2685 			*ocipos++ = OCV_OCI_LEN;
2686 			if (ocv_insert_oci(&ci, &ocipos) < 0) {
2687 				os_free(subelem);
2688 				return NULL;
2689 			}
2690 		}
2691 #endif /* CONFIG_OCV */
2692 	} else {
2693 		r0kh_id = conf->r0_key_holder;
2694 		r0kh_id_len = conf->r0_key_holder_len;
2695 		anonce = NULL;
2696 		snonce = NULL;
2697 	}
2698 	rsnxe_used = (auth_alg == WLAN_AUTH_FT) &&
2699 		(conf->sae_pwe == 1 || conf->sae_pwe == 2);
2700 #ifdef CONFIG_TESTING_OPTIONS
2701 	if (sm->wpa_auth->conf.ft_rsnxe_used) {
2702 		rsnxe_used = sm->wpa_auth->conf.ft_rsnxe_used == 1;
2703 		wpa_printf(MSG_DEBUG, "TESTING: FT: Force RSNXE Used %d",
2704 			   rsnxe_used);
2705 	}
2706 #endif /* CONFIG_TESTING_OPTIONS */
2707 	res = wpa_write_ftie(conf, use_sha384, r0kh_id, r0kh_id_len,
2708 			     anonce, snonce, pos, end - pos,
2709 			     subelem, subelem_len, rsnxe_used);
2710 	os_free(subelem);
2711 	if (res < 0)
2712 		return NULL;
2713 	ftie = pos;
2714 	ftie_len = res;
2715 	pos += res;
2716 
2717 	if (use_sha384) {
2718 		struct rsn_ftie_sha384 *_ftie =
2719 			(struct rsn_ftie_sha384 *) (ftie + 2);
2720 
2721 		fte_mic = _ftie->mic;
2722 		elem_count = &_ftie->mic_control[1];
2723 	} else {
2724 		struct rsn_ftie *_ftie = (struct rsn_ftie *) (ftie + 2);
2725 
2726 		fte_mic = _ftie->mic;
2727 		elem_count = &_ftie->mic_control[1];
2728 	}
2729 	if (auth_alg == WLAN_AUTH_FT)
2730 		*elem_count = 3; /* Information element count */
2731 
2732 	ric_start = pos;
2733 	if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse, use_sha384) == 0
2734 	    && parse.ric) {
2735 		pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
2736 					 parse.ric_len);
2737 		if (auth_alg == WLAN_AUTH_FT)
2738 			*elem_count +=
2739 				ieee802_11_ie_count(ric_start,
2740 						    pos - ric_start);
2741 	}
2742 	if (ric_start == pos)
2743 		ric_start = NULL;
2744 
2745 	if (omit_rsnxe) {
2746 		rsnxe_len = 0;
2747 	} else {
2748 		res = wpa_write_rsnxe(&sm->wpa_auth->conf, rsnxe,
2749 				      sizeof(rsnxe_buf));
2750 		if (res < 0)
2751 			return NULL;
2752 		rsnxe_len = res;
2753 	}
2754 #ifdef CONFIG_TESTING_OPTIONS
2755 	if (auth_alg == WLAN_AUTH_FT &&
2756 	    sm->wpa_auth->conf.rsnxe_override_ft_set) {
2757 		wpa_printf(MSG_DEBUG,
2758 			   "TESTING: RSNXE FT override for MIC calculation");
2759 		rsnxe = sm->wpa_auth->conf.rsnxe_override_ft;
2760 		rsnxe_len = sm->wpa_auth->conf.rsnxe_override_ft_len;
2761 	}
2762 #endif /* CONFIG_TESTING_OPTIONS */
2763 	if (auth_alg == WLAN_AUTH_FT && rsnxe_len)
2764 		*elem_count += 1;
2765 
2766 	if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2767 		kck = sm->PTK.kck2;
2768 		kck_len = sm->PTK.kck2_len;
2769 	} else {
2770 		kck = sm->PTK.kck;
2771 		kck_len = sm->PTK.kck_len;
2772 	}
2773 	if (auth_alg == WLAN_AUTH_FT &&
2774 	    wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 6,
2775 		       mdie, mdie_len, ftie, ftie_len,
2776 		       rsnie, rsnie_len,
2777 		       ric_start, ric_start ? pos - ric_start : 0,
2778 		       rsnxe_len ? rsnxe : NULL, rsnxe_len,
2779 		       fte_mic) < 0) {
2780 		wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
2781 		return NULL;
2782 	}
2783 
2784 	os_free(sm->assoc_resp_ftie);
2785 	sm->assoc_resp_ftie = os_malloc(ftie_len);
2786 	if (!sm->assoc_resp_ftie)
2787 		return NULL;
2788 	os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
2789 
2790 	return pos;
2791 }
2792 
2793 
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len,enum key_flag key_flag)2794 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
2795 				   int vlan_id,
2796 				   enum wpa_alg alg, const u8 *addr, int idx,
2797 				   u8 *key, size_t key_len,
2798 				   enum key_flag key_flag)
2799 {
2800 	if (wpa_auth->cb->set_key == NULL)
2801 		return -1;
2802 	return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
2803 				     key, key_len, key_flag);
2804 }
2805 
2806 
wpa_auth_add_sta_ft(struct wpa_authenticator * wpa_auth,const u8 * addr)2807 static inline int wpa_auth_add_sta_ft(struct wpa_authenticator *wpa_auth,
2808 				      const u8 *addr)
2809 {
2810 	if (!wpa_auth->cb->add_sta_ft)
2811 		return -1;
2812 	return wpa_auth->cb->add_sta_ft(wpa_auth->cb_ctx, addr);
2813 }
2814 
2815 
wpa_ft_install_ptk(struct wpa_state_machine * sm,int retry)2816 void wpa_ft_install_ptk(struct wpa_state_machine *sm, int retry)
2817 {
2818 	enum wpa_alg alg;
2819 	int klen;
2820 
2821 	/* MLME-SETKEYS.request(PTK) */
2822 	alg = wpa_cipher_to_alg(sm->pairwise);
2823 	klen = wpa_cipher_key_len(sm->pairwise);
2824 	if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
2825 		wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
2826 			   "PTK configuration", sm->pairwise);
2827 		return;
2828 	}
2829 
2830 	if (sm->tk_already_set) {
2831 		/* Must avoid TK reconfiguration to prevent clearing of TX/RX
2832 		 * PN in the driver */
2833 		wpa_printf(MSG_DEBUG,
2834 			   "FT: Do not re-install same PTK to the driver");
2835 		return;
2836 	}
2837 
2838 	if (!retry)
2839 		wpa_auth_add_sta_ft(sm->wpa_auth, sm->addr);
2840 
2841 	/* FIX: add STA entry to kernel/driver here? The set_key will fail
2842 	 * most likely without this.. At the moment, STA entry is added only
2843 	 * after association has been completed. This function will be called
2844 	 * again after association to get the PTK configured, but that could be
2845 	 * optimized by adding the STA entry earlier.
2846 	 */
2847 	if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, sm->keyidx_active,
2848 			     sm->PTK.tk, klen, KEY_FLAG_PAIRWISE_RX_TX))
2849 		return;
2850 
2851 	/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2852 	sm->pairwise_set = true;
2853 	sm->tk_already_set = true;
2854 }
2855 
2856 
2857 /* Derive PMK-R1 from PSK, check all available PSK */
wpa_ft_psk_pmk_r1(struct wpa_state_machine * sm,const u8 * req_pmk_r1_name,u8 * out_pmk_r1,int * out_pairwise,struct vlan_description * out_vlan,const u8 ** out_identity,size_t * out_identity_len,const u8 ** out_radius_cui,size_t * out_radius_cui_len,int * out_session_timeout)2858 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
2859 			     const u8 *req_pmk_r1_name,
2860 			     u8 *out_pmk_r1, int *out_pairwise,
2861 			     struct vlan_description *out_vlan,
2862 			     const u8 **out_identity, size_t *out_identity_len,
2863 			     const u8 **out_radius_cui,
2864 			     size_t *out_radius_cui_len,
2865 			     int *out_session_timeout)
2866 {
2867 	const u8 *pmk = NULL;
2868 	u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
2869 	u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
2870 	struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2871 	const u8 *mdid = wpa_auth->conf.mobility_domain;
2872 	const u8 *r0kh = sm->r0kh_id;
2873 	size_t r0kh_len = sm->r0kh_id_len;
2874 	const u8 *r1kh = wpa_auth->conf.r1_key_holder;
2875 	const u8 *ssid = wpa_auth->conf.ssid;
2876 	size_t ssid_len = wpa_auth->conf.ssid_len;
2877 	int pairwise;
2878 
2879 	pairwise = sm->pairwise;
2880 
2881 	for (;;) {
2882 		pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
2883 				     pmk);
2884 		if (pmk == NULL)
2885 			break;
2886 
2887 		if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
2888 				      r0kh_len, sm->addr,
2889 				      pmk_r0, pmk_r0_name, 0) < 0 ||
2890 		    wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh,
2891 				      sm->addr, pmk_r1, pmk_r1_name) < 0 ||
2892 		    os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
2893 				    WPA_PMK_NAME_LEN) != 0)
2894 			continue;
2895 
2896 		/* We found a PSK that matches the requested pmk_r1_name */
2897 		wpa_printf(MSG_DEBUG,
2898 			   "FT: Found PSK to generate PMK-R1 locally");
2899 		os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
2900 		if (out_pairwise)
2901 			*out_pairwise = pairwise;
2902 		os_memcpy(sm->PMK, pmk, PMK_LEN);
2903 		sm->pmk_len = PMK_LEN;
2904 		if (out_vlan &&
2905 		    wpa_ft_get_vlan(sm->wpa_auth, sm->addr, out_vlan) < 0) {
2906 			wpa_printf(MSG_DEBUG, "FT: vlan not available for STA "
2907 				   MACSTR, MAC2STR(sm->addr));
2908 			return -1;
2909 		}
2910 
2911 		if (out_identity && out_identity_len) {
2912 			*out_identity_len = wpa_ft_get_identity(
2913 				sm->wpa_auth, sm->addr, out_identity);
2914 		}
2915 
2916 		if (out_radius_cui && out_radius_cui_len) {
2917 			*out_radius_cui_len = wpa_ft_get_radius_cui(
2918 				sm->wpa_auth, sm->addr, out_radius_cui);
2919 		}
2920 
2921 		if (out_session_timeout) {
2922 			*out_session_timeout = wpa_ft_get_session_timeout(
2923 				sm->wpa_auth, sm->addr);
2924 		}
2925 
2926 		return 0;
2927 	}
2928 
2929 	wpa_printf(MSG_DEBUG,
2930 		   "FT: Did not find PSK to generate PMK-R1 locally");
2931 	return -1;
2932 }
2933 
2934 
2935 /* Detect the configuration the station asked for.
2936  * Required to detect FT-PSK and pairwise cipher.
2937  */
wpa_ft_set_key_mgmt(struct wpa_state_machine * sm,struct wpa_ft_ies * parse)2938 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
2939 			       struct wpa_ft_ies *parse)
2940 {
2941 	int key_mgmt, ciphers;
2942 
2943 	if (sm->wpa_key_mgmt)
2944 		return 0;
2945 
2946 	key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
2947 	if (!key_mgmt) {
2948 		wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
2949 			   MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
2950 		return -1;
2951 	}
2952 	if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
2953 		sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
2954 #ifdef CONFIG_SHA384
2955 	else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
2956 		sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384;
2957 #endif /* CONFIG_SHA384 */
2958 	else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
2959 		sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
2960 #ifdef CONFIG_FILS
2961 	else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
2962 		sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
2963 	else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
2964 		sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
2965 #endif /* CONFIG_FILS */
2966 	ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
2967 	if (!ciphers) {
2968 		wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
2969 			   MACSTR,
2970 			   parse->pairwise_cipher, MAC2STR(sm->addr));
2971 		return -1;
2972 	}
2973 	sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
2974 
2975 	return 0;
2976 }
2977 
2978 
wpa_ft_local_derive_pmk_r1(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,const u8 * r0kh_id,size_t r0kh_id_len,const u8 * req_pmk_r0_name,const u8 * req_pmk_r1_name,u8 * out_pmk_r1,int * out_pairwise,struct vlan_description * vlan,const u8 ** identity,size_t * identity_len,const u8 ** radius_cui,size_t * radius_cui_len,int * out_session_timeout)2979 static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
2980 				      struct wpa_state_machine *sm,
2981 				      const u8 *r0kh_id, size_t r0kh_id_len,
2982 				      const u8 *req_pmk_r0_name,
2983 				      const u8 *req_pmk_r1_name,
2984 				      u8 *out_pmk_r1, int *out_pairwise,
2985 				      struct vlan_description *vlan,
2986 				      const u8 **identity, size_t *identity_len,
2987 				      const u8 **radius_cui,
2988 				      size_t *radius_cui_len,
2989 				      int *out_session_timeout)
2990 {
2991 	struct wpa_auth_config *conf = &wpa_auth->conf;
2992 	const struct wpa_ft_pmk_r0_sa *r0;
2993 	u8 pmk_r1_name[WPA_PMK_NAME_LEN];
2994 	int expires_in = 0;
2995 	int session_timeout = 0;
2996 	struct os_reltime now;
2997 
2998 	if (conf->r0_key_holder_len != r0kh_id_len ||
2999 	    os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) !=
3000 	    0)
3001 		return -1; /* not our R0KH-ID */
3002 
3003 	wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration");
3004 	if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) <
3005 	    0)
3006 		return -1; /* no matching PMKR0Name in local cache */
3007 
3008 	wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache");
3009 
3010 	if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_len, r0->pmk_r0_name,
3011 			      conf->r1_key_holder,
3012 			      sm->addr, out_pmk_r1, pmk_r1_name) < 0)
3013 		return -1;
3014 
3015 	os_get_reltime(&now);
3016 	if (r0->expiration)
3017 		expires_in = r0->expiration - now.sec;
3018 
3019 	if (r0->session_timeout)
3020 		session_timeout = r0->session_timeout - now.sec;
3021 
3022 	wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, r0->pmk_r0_len,
3023 			    pmk_r1_name,
3024 			    sm->pairwise, r0->vlan, expires_in, session_timeout,
3025 			    r0->identity, r0->identity_len,
3026 			    r0->radius_cui, r0->radius_cui_len);
3027 
3028 	*out_pairwise = sm->pairwise;
3029 	if (vlan) {
3030 		if (r0->vlan)
3031 			*vlan = *r0->vlan;
3032 		else
3033 			os_memset(vlan, 0, sizeof(*vlan));
3034 	}
3035 
3036 	if (identity && identity_len) {
3037 		*identity = r0->identity;
3038 		*identity_len = r0->identity_len;
3039 	}
3040 
3041 	if (radius_cui && radius_cui_len) {
3042 		*radius_cui = r0->radius_cui;
3043 		*radius_cui_len = r0->radius_cui_len;
3044 	}
3045 
3046 	*out_session_timeout = session_timeout;
3047 
3048 	return 0;
3049 }
3050 
3051 
wpa_ft_process_auth_req(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,u8 ** resp_ies,size_t * resp_ies_len)3052 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
3053 				   const u8 *ies, size_t ies_len,
3054 				   u8 **resp_ies, size_t *resp_ies_len)
3055 {
3056 	struct rsn_mdie *mdie;
3057 	u8 pmk_r1[PMK_LEN_MAX], pmk_r1_name[WPA_PMK_NAME_LEN];
3058 	u8 ptk_name[WPA_PMK_NAME_LEN];
3059 	struct wpa_auth_config *conf;
3060 	struct wpa_ft_ies parse;
3061 	size_t buflen;
3062 	int ret;
3063 	u8 *pos, *end;
3064 	int pairwise, session_timeout = 0;
3065 	struct vlan_description vlan;
3066 	const u8 *identity, *radius_cui;
3067 	size_t identity_len = 0, radius_cui_len = 0;
3068 	int use_sha384;
3069 	size_t pmk_r1_len, kdk_len;
3070 
3071 	*resp_ies = NULL;
3072 	*resp_ies_len = 0;
3073 
3074 	sm->pmk_r1_name_valid = 0;
3075 	conf = &sm->wpa_auth->conf;
3076 
3077 	wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
3078 		    ies, ies_len);
3079 
3080 	if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) {
3081 		wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
3082 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3083 	}
3084 	use_sha384 = wpa_key_mgmt_sha384(parse.key_mgmt);
3085 	pmk_r1_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
3086 
3087 	mdie = (struct rsn_mdie *) parse.mdie;
3088 	if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
3089 	    os_memcmp(mdie->mobility_domain,
3090 		      sm->wpa_auth->conf.mobility_domain,
3091 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
3092 		wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
3093 		return WLAN_STATUS_INVALID_MDIE;
3094 	}
3095 
3096 	if (use_sha384) {
3097 		struct rsn_ftie_sha384 *ftie;
3098 
3099 		ftie = (struct rsn_ftie_sha384 *) parse.ftie;
3100 		if (!ftie || parse.ftie_len < sizeof(*ftie)) {
3101 			wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3102 			return WLAN_STATUS_INVALID_FTIE;
3103 		}
3104 
3105 		os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
3106 	} else {
3107 		struct rsn_ftie *ftie;
3108 
3109 		ftie = (struct rsn_ftie *) parse.ftie;
3110 		if (!ftie || parse.ftie_len < sizeof(*ftie)) {
3111 			wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3112 			return WLAN_STATUS_INVALID_FTIE;
3113 		}
3114 
3115 		os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
3116 	}
3117 
3118 	if (parse.r0kh_id == NULL) {
3119 		wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
3120 		return WLAN_STATUS_INVALID_FTIE;
3121 	}
3122 
3123 	wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
3124 		    parse.r0kh_id, parse.r0kh_id_len);
3125 	os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
3126 	sm->r0kh_id_len = parse.r0kh_id_len;
3127 
3128 	if (parse.rsn_pmkid == NULL) {
3129 		wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
3130 		return WLAN_STATUS_INVALID_PMKID;
3131 	}
3132 
3133 	if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
3134 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3135 
3136 	wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
3137 		    parse.rsn_pmkid, WPA_PMK_NAME_LEN);
3138 	if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
3139 				   sm->wpa_auth->conf.r1_key_holder, sm->addr,
3140 				   pmk_r1_name, use_sha384) < 0)
3141 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3142 
3143 	if (conf->ft_psk_generate_local &&
3144 	    wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
3145 		if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise,
3146 				      &vlan, &identity, &identity_len,
3147 				      &radius_cui, &radius_cui_len,
3148 				      &session_timeout) < 0)
3149 			return WLAN_STATUS_INVALID_PMKID;
3150 		wpa_printf(MSG_DEBUG,
3151 			   "FT: Generated PMK-R1 for FT-PSK locally");
3152 	} else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
3153 				       pmk_r1, &pmk_r1_len, &pairwise, &vlan,
3154 				       &identity, &identity_len, &radius_cui,
3155 				       &radius_cui_len, &session_timeout) < 0) {
3156 		wpa_printf(MSG_DEBUG,
3157 			   "FT: No PMK-R1 available in local cache for the requested PMKR1Name");
3158 		if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm,
3159 					       parse.r0kh_id, parse.r0kh_id_len,
3160 					       parse.rsn_pmkid,
3161 					       pmk_r1_name, pmk_r1, &pairwise,
3162 					       &vlan, &identity, &identity_len,
3163 					       &radius_cui, &radius_cui_len,
3164 					       &session_timeout) == 0) {
3165 			wpa_printf(MSG_DEBUG,
3166 				   "FT: Generated PMK-R1 based on local PMK-R0");
3167 			goto pmk_r1_derived;
3168 		}
3169 
3170 		if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
3171 			wpa_printf(MSG_DEBUG,
3172 				   "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
3173 			return WLAN_STATUS_INVALID_PMKID;
3174 		}
3175 
3176 		return -1; /* Status pending */
3177 	} else {
3178 		wpa_printf(MSG_DEBUG, "FT: Found PMKR1Name from local cache");
3179 	}
3180 
3181 pmk_r1_derived:
3182 	wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, pmk_r1_len);
3183 	sm->pmk_r1_name_valid = 1;
3184 	os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
3185 	os_memcpy(sm->pmk_r1, pmk_r1, pmk_r1_len);
3186 	sm->pmk_r1_len = pmk_r1_len;
3187 
3188 	if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
3189 		wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
3190 			   "ANonce");
3191 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3192 	}
3193 
3194 	wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
3195 		    sm->SNonce, WPA_NONCE_LEN);
3196 	wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
3197 		    sm->ANonce, WPA_NONCE_LEN);
3198 
3199 	if (sm->wpa_auth->conf.force_kdk_derivation ||
3200 	    (sm->wpa_auth->conf.secure_ltf &&
3201 	     sm->rsnxe && sm->rsnxe_len >= 4 &&
3202 	     sm->rsnxe[3] & BIT(WLAN_RSNX_CAPAB_SECURE_LTF - 8)))
3203 		kdk_len = WPA_KDK_MAX_LEN;
3204 	else
3205 		kdk_len = 0;
3206 
3207 	if (wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
3208 			      sm->addr, sm->wpa_auth->addr, pmk_r1_name,
3209 			      &sm->PTK, ptk_name, sm->wpa_key_mgmt,
3210 			      pairwise, kdk_len) < 0)
3211 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3212 
3213 	sm->pairwise = pairwise;
3214 	sm->PTK_valid = true;
3215 	sm->tk_already_set = false;
3216 	wpa_ft_install_ptk(sm, 0);
3217 
3218 	if (wpa_ft_set_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
3219 		wpa_printf(MSG_DEBUG, "FT: Failed to configure VLAN");
3220 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3221 	}
3222 	if (wpa_ft_set_identity(sm->wpa_auth, sm->addr,
3223 				identity, identity_len) < 0 ||
3224 	    wpa_ft_set_radius_cui(sm->wpa_auth, sm->addr,
3225 				  radius_cui, radius_cui_len) < 0) {
3226 		wpa_printf(MSG_DEBUG, "FT: Failed to configure identity/CUI");
3227 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3228 	}
3229 	wpa_ft_set_session_timeout(sm->wpa_auth, sm->addr, session_timeout);
3230 
3231 	buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
3232 		2 + FT_R1KH_ID_LEN + 200;
3233 	*resp_ies = os_zalloc(buflen);
3234 	if (*resp_ies == NULL)
3235 		goto fail;
3236 
3237 	pos = *resp_ies;
3238 	end = *resp_ies + buflen;
3239 
3240 	ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
3241 	if (ret < 0)
3242 		goto fail;
3243 	pos += ret;
3244 
3245 	ret = wpa_write_mdie(conf, pos, end - pos);
3246 	if (ret < 0)
3247 		goto fail;
3248 	pos += ret;
3249 
3250 	ret = wpa_write_ftie(conf, use_sha384, parse.r0kh_id, parse.r0kh_id_len,
3251 			     sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0,
3252 			     0);
3253 	if (ret < 0)
3254 		goto fail;
3255 	pos += ret;
3256 
3257 	*resp_ies_len = pos - *resp_ies;
3258 
3259 	return WLAN_STATUS_SUCCESS;
3260 fail:
3261 	os_free(*resp_ies);
3262 	*resp_ies = NULL;
3263 	return WLAN_STATUS_UNSPECIFIED_FAILURE;
3264 }
3265 
3266 
wpa_ft_process_auth(struct wpa_state_machine * sm,const u8 * bssid,u16 auth_transaction,const u8 * ies,size_t ies_len,void (* cb)(void * ctx,const u8 * dst,const u8 * bssid,u16 auth_transaction,u16 status,const u8 * ies,size_t ies_len),void * ctx)3267 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
3268 			 u16 auth_transaction, const u8 *ies, size_t ies_len,
3269 			 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
3270 				    u16 auth_transaction, u16 status,
3271 				    const u8 *ies, size_t ies_len),
3272 			 void *ctx)
3273 {
3274 	u16 status;
3275 	u8 *resp_ies;
3276 	size_t resp_ies_len;
3277 	int res;
3278 
3279 	if (sm == NULL) {
3280 		wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
3281 			   "WPA SM not available");
3282 		return;
3283 	}
3284 
3285 	wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
3286 		   " BSSID=" MACSTR " transaction=%d",
3287 		   MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
3288 	sm->ft_pending_cb = cb;
3289 	sm->ft_pending_cb_ctx = ctx;
3290 	sm->ft_pending_auth_transaction = auth_transaction;
3291 	sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
3292 	res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
3293 				      &resp_ies_len);
3294 	if (res < 0) {
3295 		wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
3296 		return;
3297 	}
3298 	status = res;
3299 
3300 	wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
3301 		   " auth_transaction=%d status=%u (%s)",
3302 		   MAC2STR(sm->addr), auth_transaction + 1, status,
3303 		   status2str(status));
3304 	wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
3305 	cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
3306 	   resp_ies, resp_ies_len);
3307 	os_free(resp_ies);
3308 }
3309 
3310 
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)3311 int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
3312 			    size_t ies_len)
3313 {
3314 	struct wpa_ft_ies parse;
3315 	struct rsn_mdie *mdie;
3316 	u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
3317 	size_t mic_len = 16;
3318 	unsigned int count;
3319 	const u8 *kck;
3320 	size_t kck_len;
3321 	int use_sha384;
3322 	const u8 *anonce, *snonce, *fte_mic;
3323 	u8 fte_elem_count;
3324 	int rsnxe_used;
3325 	struct wpa_auth_config *conf;
3326 
3327 	if (sm == NULL)
3328 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3329 
3330 	conf = &sm->wpa_auth->conf;
3331 	use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
3332 
3333 	wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
3334 
3335 	if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
3336 		wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
3337 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3338 	}
3339 
3340 	if (parse.rsn == NULL) {
3341 		wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
3342 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3343 	}
3344 
3345 	if (parse.rsn_pmkid == NULL) {
3346 		wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
3347 		return WLAN_STATUS_INVALID_PMKID;
3348 	}
3349 
3350 	if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
3351 	    != 0) {
3352 		wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
3353 			   "with the PMKR1Name derived from auth request");
3354 		return WLAN_STATUS_INVALID_PMKID;
3355 	}
3356 
3357 	mdie = (struct rsn_mdie *) parse.mdie;
3358 	if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
3359 	    os_memcmp(mdie->mobility_domain, conf->mobility_domain,
3360 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
3361 		wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
3362 		return WLAN_STATUS_INVALID_MDIE;
3363 	}
3364 
3365 	if (use_sha384) {
3366 		struct rsn_ftie_sha384 *ftie;
3367 
3368 		ftie = (struct rsn_ftie_sha384 *) parse.ftie;
3369 		if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
3370 			wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3371 			return WLAN_STATUS_INVALID_FTIE;
3372 		}
3373 
3374 		anonce = ftie->anonce;
3375 		snonce = ftie->snonce;
3376 		rsnxe_used = ftie->mic_control[0] & 0x01;
3377 		fte_elem_count = ftie->mic_control[1];
3378 		fte_mic = ftie->mic;
3379 	} else {
3380 		struct rsn_ftie *ftie;
3381 
3382 		ftie = (struct rsn_ftie *) parse.ftie;
3383 		if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
3384 			wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3385 			return WLAN_STATUS_INVALID_FTIE;
3386 		}
3387 
3388 		anonce = ftie->anonce;
3389 		snonce = ftie->snonce;
3390 		rsnxe_used = ftie->mic_control[0] & 0x01;
3391 		fte_elem_count = ftie->mic_control[1];
3392 		fte_mic = ftie->mic;
3393 	}
3394 
3395 	if (os_memcmp(snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
3396 		wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
3397 		wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
3398 			    snonce, WPA_NONCE_LEN);
3399 		wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
3400 			    sm->SNonce, WPA_NONCE_LEN);
3401 		return WLAN_STATUS_INVALID_FTIE;
3402 	}
3403 
3404 	if (os_memcmp(anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
3405 		wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
3406 		wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
3407 			    anonce, WPA_NONCE_LEN);
3408 		wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
3409 			    sm->ANonce, WPA_NONCE_LEN);
3410 		return WLAN_STATUS_INVALID_FTIE;
3411 	}
3412 
3413 
3414 	if (parse.r0kh_id == NULL) {
3415 		wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
3416 		return WLAN_STATUS_INVALID_FTIE;
3417 	}
3418 
3419 	if (parse.r0kh_id_len != sm->r0kh_id_len ||
3420 	    os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
3421 	{
3422 		wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
3423 			   "the current R0KH-ID");
3424 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
3425 			    parse.r0kh_id, parse.r0kh_id_len);
3426 		wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
3427 			    sm->r0kh_id, sm->r0kh_id_len);
3428 		return WLAN_STATUS_INVALID_FTIE;
3429 	}
3430 
3431 	if (parse.r1kh_id == NULL) {
3432 		wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
3433 		return WLAN_STATUS_INVALID_FTIE;
3434 	}
3435 
3436 	if (os_memcmp_const(parse.r1kh_id, conf->r1_key_holder,
3437 			    FT_R1KH_ID_LEN) != 0) {
3438 		wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
3439 			   "ReassocReq");
3440 		wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
3441 			    parse.r1kh_id, FT_R1KH_ID_LEN);
3442 		wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
3443 			    conf->r1_key_holder, FT_R1KH_ID_LEN);
3444 		return WLAN_STATUS_INVALID_FTIE;
3445 	}
3446 
3447 	if (parse.rsn_pmkid == NULL ||
3448 	    os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
3449 	{
3450 		wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
3451 			   "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
3452 		return WLAN_STATUS_INVALID_PMKID;
3453 	}
3454 
3455 	count = 3;
3456 	if (parse.ric)
3457 		count += ieee802_11_ie_count(parse.ric, parse.ric_len);
3458 	if (parse.rsnxe)
3459 		count++;
3460 	if (fte_elem_count != count) {
3461 		wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
3462 			   "Control: received %u expected %u",
3463 			   fte_elem_count, count);
3464 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3465 	}
3466 
3467 	if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
3468 		kck = sm->PTK.kck2;
3469 		kck_len = sm->PTK.kck2_len;
3470 	} else {
3471 		kck = sm->PTK.kck;
3472 		kck_len = sm->PTK.kck_len;
3473 	}
3474 	if (wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 5,
3475 		       parse.mdie - 2, parse.mdie_len + 2,
3476 		       parse.ftie - 2, parse.ftie_len + 2,
3477 		       parse.rsn - 2, parse.rsn_len + 2,
3478 		       parse.ric, parse.ric_len,
3479 		       parse.rsnxe ? parse.rsnxe - 2 : NULL,
3480 		       parse.rsnxe ? parse.rsnxe_len + 2 : 0,
3481 		       mic) < 0) {
3482 		wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
3483 		return WLAN_STATUS_UNSPECIFIED_FAILURE;
3484 	}
3485 
3486 	if (os_memcmp_const(mic, fte_mic, mic_len) != 0) {
3487 		wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
3488 		wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
3489 			   MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
3490 		wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
3491 			    fte_mic, mic_len);
3492 		wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
3493 		wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
3494 			    parse.mdie - 2, parse.mdie_len + 2);
3495 		wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
3496 			    parse.ftie - 2, parse.ftie_len + 2);
3497 		wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
3498 			    parse.rsn - 2, parse.rsn_len + 2);
3499 		wpa_hexdump(MSG_MSGDUMP, "FT: RSNXE",
3500 			    parse.rsnxe ? parse.rsnxe - 2 : NULL,
3501 			    parse.rsnxe ? parse.rsnxe_len + 2 : 0);
3502 		return WLAN_STATUS_INVALID_FTIE;
3503 	}
3504 
3505 	if (rsnxe_used && (conf->sae_pwe == 1 || conf->sae_pwe == 2) &&
3506 	    !parse.rsnxe) {
3507 		wpa_printf(MSG_INFO,
3508 			   "FT: FTE indicated that STA uses RSNXE, but RSNXE was not included");
3509 		return -1; /* discard request */
3510 	}
3511 
3512 #ifdef CONFIG_OCV
3513 	if (wpa_auth_uses_ocv(sm)) {
3514 		struct wpa_channel_info ci;
3515 		int tx_chanwidth;
3516 		int tx_seg1_idx;
3517 		enum oci_verify_result res;
3518 
3519 		if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
3520 			wpa_printf(MSG_WARNING,
3521 				   "Failed to get channel info to validate received OCI in (Re)Assoc Request");
3522 			return WLAN_STATUS_UNSPECIFIED_FAILURE;
3523 		}
3524 
3525 		if (get_sta_tx_parameters(sm,
3526 					  channel_width_to_int(ci.chanwidth),
3527 					  ci.seg1_idx, &tx_chanwidth,
3528 					  &tx_seg1_idx) < 0)
3529 			return WLAN_STATUS_UNSPECIFIED_FAILURE;
3530 
3531 		res = ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
3532 					   tx_chanwidth, tx_seg1_idx);
3533 		if (wpa_auth_uses_ocv(sm) == 2 && res == OCI_NOT_FOUND) {
3534 			/* Work around misbehaving STAs */
3535 			wpa_printf(MSG_INFO,
3536 				   "Disable OCV with a STA that does not send OCI");
3537 			wpa_auth_set_ocv(sm, 0);
3538 		} else if (res != OCI_SUCCESS) {
3539 			wpa_printf(MSG_WARNING, "OCV failed: %s", ocv_errorstr);
3540 			if (sm->wpa_auth->conf.msg_ctx)
3541 				wpa_msg(sm->wpa_auth->conf.msg_ctx, MSG_INFO,
3542 					OCV_FAILURE "addr=" MACSTR
3543 					" frame=ft-reassoc-req error=%s",
3544 					MAC2STR(sm->addr), ocv_errorstr);
3545 			return WLAN_STATUS_INVALID_FTIE;
3546 		}
3547 	}
3548 #endif /* CONFIG_OCV */
3549 
3550 	return WLAN_STATUS_SUCCESS;
3551 }
3552 
3553 
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)3554 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
3555 {
3556 	const u8 *sta_addr, *target_ap;
3557 	const u8 *ies;
3558 	size_t ies_len;
3559 	u8 action;
3560 	struct ft_rrb_frame *frame;
3561 
3562 	if (sm == NULL)
3563 		return -1;
3564 
3565 	/*
3566 	 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
3567 	 * FT Request action frame body[variable]
3568 	 */
3569 
3570 	if (len < 14) {
3571 		wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
3572 			   "(len=%lu)", (unsigned long) len);
3573 		return -1;
3574 	}
3575 
3576 	action = data[1];
3577 	sta_addr = data + 2;
3578 	target_ap = data + 8;
3579 	ies = data + 14;
3580 	ies_len = len - 14;
3581 
3582 	wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
3583 		   " Target AP=" MACSTR " Action=%d)",
3584 		   MAC2STR(sta_addr), MAC2STR(target_ap), action);
3585 
3586 	if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
3587 		wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
3588 			   "STA=" MACSTR " STA-Address=" MACSTR,
3589 			   MAC2STR(sm->addr), MAC2STR(sta_addr));
3590 		return -1;
3591 	}
3592 
3593 	/*
3594 	 * Do some sanity checking on the target AP address (not own and not
3595 	 * broadcast. This could be extended to filter based on a list of known
3596 	 * APs in the MD (if such a list were configured).
3597 	 */
3598 	if ((target_ap[0] & 0x01) ||
3599 	    os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
3600 		wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
3601 			   "frame");
3602 		return -1;
3603 	}
3604 
3605 	wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
3606 
3607 	if (!sm->wpa_auth->conf.ft_over_ds) {
3608 		wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
3609 		return -1;
3610 	}
3611 
3612 	/* RRB - Forward action frame to the target AP */
3613 	frame = os_malloc(sizeof(*frame) + len);
3614 	if (frame == NULL)
3615 		return -1;
3616 	frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
3617 	frame->packet_type = FT_PACKET_REQUEST;
3618 	frame->action_length = host_to_le16(len);
3619 	os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
3620 	os_memcpy(frame + 1, data, len);
3621 
3622 	wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
3623 			sizeof(*frame) + len);
3624 	os_free(frame);
3625 
3626 	return 0;
3627 }
3628 
3629 
wpa_ft_rrb_rx_request_cb(void * ctx,const u8 * dst,const u8 * bssid,u16 auth_transaction,u16 resp,const u8 * ies,size_t ies_len)3630 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
3631 				     u16 auth_transaction, u16 resp,
3632 				     const u8 *ies, size_t ies_len)
3633 {
3634 	struct wpa_state_machine *sm = ctx;
3635 	wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
3636 		   MAC2STR(sm->addr));
3637 	wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
3638 				  WLAN_STATUS_SUCCESS, ies, ies_len);
3639 }
3640 
3641 
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)3642 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
3643 				 const u8 *current_ap, const u8 *sta_addr,
3644 				 const u8 *body, size_t len)
3645 {
3646 	struct wpa_state_machine *sm;
3647 	u16 status;
3648 	u8 *resp_ies;
3649 	size_t resp_ies_len;
3650 	int res;
3651 
3652 	sm = wpa_ft_add_sta(wpa_auth, sta_addr);
3653 	if (sm == NULL) {
3654 		wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
3655 			   "RRB Request");
3656 		return -1;
3657 	}
3658 
3659 	wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
3660 
3661 	sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
3662 	sm->ft_pending_cb_ctx = sm;
3663 	os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
3664 	sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
3665 	res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
3666 				      &resp_ies_len);
3667 	if (res < 0) {
3668 		wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
3669 		return 0;
3670 	}
3671 	status = res;
3672 
3673 	res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
3674 					resp_ies, resp_ies_len);
3675 	os_free(resp_ies);
3676 	return res;
3677 }
3678 
3679 
wpa_ft_send_rrb_auth_resp(struct wpa_state_machine * sm,const u8 * current_ap,const u8 * sta_addr,u16 status,const u8 * resp_ies,size_t resp_ies_len)3680 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
3681 				     const u8 *current_ap, const u8 *sta_addr,
3682 				     u16 status, const u8 *resp_ies,
3683 				     size_t resp_ies_len)
3684 {
3685 	struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3686 	size_t rlen;
3687 	struct ft_rrb_frame *frame;
3688 	u8 *pos;
3689 
3690 	wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
3691 		   " CurrentAP=" MACSTR " status=%u (%s)",
3692 		   MAC2STR(sm->addr), MAC2STR(current_ap), status,
3693 		   status2str(status));
3694 	wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
3695 
3696 	/* RRB - Forward action frame response to the Current AP */
3697 
3698 	/*
3699 	 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
3700 	 * Status_Code[2] FT Request action frame body[variable]
3701 	 */
3702 	rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
3703 
3704 	frame = os_malloc(sizeof(*frame) + rlen);
3705 	if (frame == NULL)
3706 		return -1;
3707 	frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
3708 	frame->packet_type = FT_PACKET_RESPONSE;
3709 	frame->action_length = host_to_le16(rlen);
3710 	os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
3711 	pos = (u8 *) (frame + 1);
3712 	*pos++ = WLAN_ACTION_FT;
3713 	*pos++ = 2; /* Action: Response */
3714 	os_memcpy(pos, sta_addr, ETH_ALEN);
3715 	pos += ETH_ALEN;
3716 	os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
3717 	pos += ETH_ALEN;
3718 	WPA_PUT_LE16(pos, status);
3719 	pos += 2;
3720 	if (resp_ies)
3721 		os_memcpy(pos, resp_ies, resp_ies_len);
3722 
3723 	wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
3724 			sizeof(*frame) + rlen);
3725 	os_free(frame);
3726 
3727 	return 0;
3728 }
3729 
3730 
wpa_ft_rrb_build_r0(const u8 * key,const size_t key_len,const struct tlv_list * tlvs,const struct wpa_ft_pmk_r0_sa * pmk_r0,const u8 * r1kh_id,const u8 * s1kh_id,const struct tlv_list * tlv_auth,const u8 * src_addr,u8 type,u8 ** packet,size_t * packet_len)3731 static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
3732 			       const struct tlv_list *tlvs,
3733 			       const struct wpa_ft_pmk_r0_sa *pmk_r0,
3734 			       const u8 *r1kh_id, const u8 *s1kh_id,
3735 			       const struct tlv_list *tlv_auth,
3736 			       const u8 *src_addr, u8 type,
3737 			       u8 **packet, size_t *packet_len)
3738 {
3739 	u8 pmk_r1[PMK_LEN_MAX];
3740 	size_t pmk_r1_len = pmk_r0->pmk_r0_len;
3741 	u8 pmk_r1_name[WPA_PMK_NAME_LEN];
3742 	u8 f_pairwise[sizeof(le16)];
3743 	u8 f_expires_in[sizeof(le16)];
3744 	u8 f_session_timeout[sizeof(le32)];
3745 	int expires_in;
3746 	int session_timeout;
3747 	struct os_reltime now;
3748 	int ret;
3749 	struct tlv_list sess_tlv[] = {
3750 		{ .type = FT_RRB_PMK_R1, .len = pmk_r1_len,
3751 		  .data = pmk_r1 },
3752 		{ .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
3753 		  .data = pmk_r1_name },
3754 		{ .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
3755 		  .data = f_pairwise },
3756 		{ .type = FT_RRB_EXPIRES_IN, .len = sizeof(f_expires_in),
3757 		  .data = f_expires_in },
3758 		{ .type = FT_RRB_IDENTITY, .len = pmk_r0->identity_len,
3759 		  .data = pmk_r0->identity },
3760 		{ .type = FT_RRB_RADIUS_CUI, .len = pmk_r0->radius_cui_len,
3761 		  .data = pmk_r0->radius_cui },
3762 		{ .type = FT_RRB_SESSION_TIMEOUT,
3763 		  .len = sizeof(f_session_timeout),
3764 		  .data = f_session_timeout },
3765 		{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3766 	};
3767 
3768 	wpa_printf(MSG_DEBUG, "FT: Derive PMK-R1 for peer AP");
3769 	if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_len,
3770 			      pmk_r0->pmk_r0_name, r1kh_id,
3771 			      s1kh_id, pmk_r1, pmk_r1_name) < 0)
3772 		return -1;
3773 	WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);
3774 
3775 	os_get_reltime(&now);
3776 	if (pmk_r0->expiration > now.sec)
3777 		expires_in = pmk_r0->expiration - now.sec;
3778 	else if (pmk_r0->expiration)
3779 		expires_in = 1;
3780 	else
3781 		expires_in = 0;
3782 	WPA_PUT_LE16(f_expires_in, expires_in);
3783 
3784 	if (pmk_r0->session_timeout > now.sec)
3785 		session_timeout = pmk_r0->session_timeout - now.sec;
3786 	else if (pmk_r0->session_timeout)
3787 		session_timeout = 1;
3788 	else
3789 		session_timeout = 0;
3790 	WPA_PUT_LE32(f_session_timeout, session_timeout);
3791 
3792 	ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
3793 			       pmk_r0->vlan, src_addr, type,
3794 			       packet, packet_len);
3795 
3796 	forced_memzero(pmk_r1, sizeof(pmk_r1));
3797 
3798 	return ret;
3799 }
3800 
3801 
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer)3802 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
3803 			      const u8 *src_addr,
3804 			      const u8 *enc, size_t enc_len,
3805 			      const u8 *auth, size_t auth_len,
3806 			      int no_defer)
3807 {
3808 	const char *msgtype = "pull request";
3809 	u8 *plain = NULL, *packet = NULL;
3810 	size_t plain_len = 0, packet_len = 0;
3811 	struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
3812 	const u8 *key;
3813 	size_t key_len;
3814 	int seq_ret;
3815 	const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
3816 	size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
3817 	size_t f_pmk_r0_name_len;
3818 	const struct wpa_ft_pmk_r0_sa *r0;
3819 	int ret;
3820 	struct tlv_list resp[2];
3821 	struct tlv_list resp_auth[5];
3822 	struct ft_rrb_seq f_seq;
3823 
3824 	wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
3825 
3826 	RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
3827 	wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
3828 
3829 	if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
3830 		wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
3831 		goto out;
3832 	}
3833 
3834 	RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
3835 	wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
3836 
3837 	wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
3838 	if (r1kh) {
3839 		key = r1kh->key;
3840 		key_len = sizeof(r1kh->key);
3841 	} else if (r1kh_wildcard) {
3842 		wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
3843 		key = r1kh_wildcard->key;
3844 		key_len = sizeof(r1kh_wildcard->key);
3845 	} else {
3846 		goto out;
3847 	}
3848 
3849 	RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
3850 	wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
3851 
3852 	seq_ret = FT_RRB_SEQ_DROP;
3853 	if (r1kh)
3854 		seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
3855 					     auth, auth_len, msgtype, no_defer);
3856 	if (!no_defer && r1kh_wildcard &&
3857 	    (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
3858 		/* wildcard: r1kh-id unknown or changed addr -> do a seq req */
3859 		seq_ret = FT_RRB_SEQ_DEFER;
3860 	}
3861 
3862 	if (seq_ret == FT_RRB_SEQ_DROP)
3863 		goto out;
3864 
3865 	if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
3866 			       src_addr, FT_PACKET_R0KH_R1KH_PULL,
3867 			       &plain, &plain_len) < 0)
3868 		goto out;
3869 
3870 	if (!r1kh)
3871 		r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
3872 					   f_r1kh_id,
3873 					   wpa_auth->conf.rkh_pos_timeout);
3874 	if (!r1kh)
3875 		goto out;
3876 
3877 	if (seq_ret == FT_RRB_SEQ_DEFER) {
3878 		wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
3879 				   f_r0kh_id_len, f_r1kh_id, key, key_len,
3880 				   enc, enc_len, auth, auth_len,
3881 				   &wpa_ft_rrb_rx_pull);
3882 		goto out;
3883 	}
3884 
3885 	wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
3886 			      msgtype);
3887 	wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
3888 				  wpa_auth->conf.rkh_pos_timeout);
3889 
3890 	RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
3891 	wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
3892 		    f_pmk_r0_name_len);
3893 
3894 	RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
3895 	wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
3896 
3897 	if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
3898 		wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3899 		goto out;
3900 	}
3901 
3902 	wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull response from " MACSTR
3903 		   " to " MACSTR,
3904 		   MAC2STR(wpa_auth->addr), MAC2STR(src_addr));
3905 
3906 	resp[0].type = FT_RRB_S1KH_ID;
3907 	resp[0].len = f_s1kh_id_len;
3908 	resp[0].data = f_s1kh_id;
3909 	resp[1].type = FT_RRB_LAST_EMPTY;
3910 	resp[1].len = 0;
3911 	resp[1].data = NULL;
3912 
3913 	resp_auth[0].type = FT_RRB_NONCE;
3914 	resp_auth[0].len = f_nonce_len;
3915 	resp_auth[0].data = f_nonce;
3916 	resp_auth[1].type = FT_RRB_SEQ;
3917 	resp_auth[1].len = sizeof(f_seq);
3918 	resp_auth[1].data = (u8 *) &f_seq;
3919 	resp_auth[2].type = FT_RRB_R0KH_ID;
3920 	resp_auth[2].len = f_r0kh_id_len;
3921 	resp_auth[2].data = f_r0kh_id;
3922 	resp_auth[3].type = FT_RRB_R1KH_ID;
3923 	resp_auth[3].len = f_r1kh_id_len;
3924 	resp_auth[3].data = f_r1kh_id;
3925 	resp_auth[4].type = FT_RRB_LAST_EMPTY;
3926 	resp_auth[4].len = 0;
3927 	resp_auth[4].data = NULL;
3928 
3929 	if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0) {
3930 		wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
3931 		ret = wpa_ft_rrb_build(key, key_len, resp, NULL, resp_auth,
3932 				       NULL, wpa_auth->addr,
3933 				       FT_PACKET_R0KH_R1KH_RESP,
3934 				       &packet, &packet_len);
3935 	} else {
3936 		ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id,
3937 					  f_s1kh_id, resp_auth, wpa_auth->addr,
3938 					  FT_PACKET_R0KH_R1KH_RESP,
3939 					  &packet, &packet_len);
3940 	}
3941 
3942 	if (!ret)
3943 		wpa_ft_rrb_oui_send(wpa_auth, src_addr,
3944 				    FT_PACKET_R0KH_R1KH_RESP, packet,
3945 				    packet_len);
3946 
3947 out:
3948 	os_free(plain);
3949 	os_free(packet);
3950 
3951 	return 0;
3952 }
3953 
3954 
3955 /* @returns  0 on success
3956  *          -1 on error
3957  *          -2 if FR_RRB_PAIRWISE is missing
3958  */
wpa_ft_rrb_rx_r1(struct wpa_authenticator * wpa_auth,const u8 * src_addr,u8 type,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,const char * msgtype,u8 * s1kh_id_out,int (* cb)(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer))3959 static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
3960 			    const u8 *src_addr, u8 type,
3961 			    const u8 *enc, size_t enc_len,
3962 			    const u8 *auth, size_t auth_len,
3963 			    const char *msgtype, u8 *s1kh_id_out,
3964 			    int (*cb)(struct wpa_authenticator *wpa_auth,
3965 				      const u8 *src_addr,
3966 				      const u8 *enc, size_t enc_len,
3967 				      const u8 *auth, size_t auth_len,
3968 				      int no_defer))
3969 {
3970 	u8 *plain = NULL;
3971 	size_t plain_len = 0;
3972 	struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
3973 	const u8 *key;
3974 	size_t key_len;
3975 	int seq_ret;
3976 	const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
3977 	const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
3978 	const u8 *f_expires_in;
3979 	size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
3980 	const u8 *f_identity, *f_radius_cui;
3981 	const u8 *f_session_timeout;
3982 	size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
3983 	size_t f_expires_in_len;
3984 	size_t f_identity_len, f_radius_cui_len;
3985 	size_t f_session_timeout_len;
3986 	int pairwise;
3987 	int ret = -1;
3988 	int expires_in;
3989 	int session_timeout;
3990 	struct vlan_description vlan;
3991 	size_t pmk_r1_len;
3992 
3993 	RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
3994 	wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
3995 
3996 	RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
3997 	wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
3998 
3999 	if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
4000 		wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
4001 		goto out;
4002 	}
4003 
4004 	wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
4005 			       &r0kh_wildcard);
4006 	if (r0kh) {
4007 		key = r0kh->key;
4008 		key_len = sizeof(r0kh->key);
4009 	} else if (r0kh_wildcard) {
4010 		wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
4011 		key = r0kh_wildcard->key;
4012 		key_len = sizeof(r0kh_wildcard->key);
4013 	} else {
4014 		goto out;
4015 	}
4016 
4017 	seq_ret = FT_RRB_SEQ_DROP;
4018 	if (r0kh) {
4019 		seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
4020 					     auth, auth_len, msgtype,
4021 					     cb ? 0 : 1);
4022 	}
4023 	if (cb && r0kh_wildcard &&
4024 	    (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
4025 		/* wildcard: r0kh-id unknown or changed addr -> do a seq req */
4026 		seq_ret = FT_RRB_SEQ_DEFER;
4027 	}
4028 
4029 	if (seq_ret == FT_RRB_SEQ_DROP)
4030 		goto out;
4031 
4032 	if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
4033 			       src_addr, type, &plain, &plain_len) < 0)
4034 		goto out;
4035 
4036 	if (!r0kh)
4037 		r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
4038 					   f_r0kh_id, f_r0kh_id_len,
4039 					   wpa_auth->conf.rkh_pos_timeout);
4040 	if (!r0kh)
4041 		goto out;
4042 
4043 	if (seq_ret == FT_RRB_SEQ_DEFER) {
4044 		wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
4045 				   f_r0kh_id_len, f_r1kh_id, key, key_len,
4046 				   enc, enc_len, auth, auth_len, cb);
4047 		goto out;
4048 	}
4049 
4050 	wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
4051 			      msgtype);
4052 	wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
4053 				  wpa_auth->conf.rkh_pos_timeout);
4054 
4055 	RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
4056 	wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
4057 
4058 	if (s1kh_id_out)
4059 		os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);
4060 
4061 	ret = -2;
4062 	RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
4063 	wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);
4064 
4065 	ret = -1;
4066 	RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
4067 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
4068 		    f_pmk_r1_name, WPA_PMK_NAME_LEN);
4069 
4070 	pmk_r1_len = PMK_LEN;
4071 	if (wpa_ft_rrb_get_tlv(plain, plain_len, FT_RRB_PMK_R1, &f_pmk_r1_len,
4072 			       &f_pmk_r1) == 0 &&
4073 	    (f_pmk_r1_len == PMK_LEN || f_pmk_r1_len == SHA384_MAC_LEN))
4074 		pmk_r1_len = f_pmk_r1_len;
4075 	RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, pmk_r1_len);
4076 	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, pmk_r1_len);
4077 
4078 	pairwise = WPA_GET_LE16(f_pairwise);
4079 
4080 	RRB_GET_OPTIONAL(FT_RRB_EXPIRES_IN, expires_in, msgtype,
4081 			 sizeof(le16));
4082 	if (f_expires_in)
4083 		expires_in = WPA_GET_LE16(f_expires_in);
4084 	else
4085 		expires_in = 0;
4086 
4087 	wpa_printf(MSG_DEBUG, "FT: PMK-R1 %s - expires_in=%d", msgtype,
4088 		   expires_in);
4089 
4090 	if (wpa_ft_rrb_get_tlv_vlan(plain, plain_len, &vlan) < 0) {
4091 		wpa_printf(MSG_DEBUG, "FT: Cannot parse vlan");
4092 		wpa_ft_rrb_dump(plain, plain_len);
4093 		goto out;
4094 	}
4095 
4096 	wpa_printf(MSG_DEBUG, "FT: vlan %d%s",
4097 		   le_to_host16(vlan.untagged), vlan.tagged[0] ? "+" : "");
4098 
4099 	RRB_GET_OPTIONAL(FT_RRB_IDENTITY, identity, msgtype, -1);
4100 	if (f_identity)
4101 		wpa_hexdump_ascii(MSG_DEBUG, "FT: Identity", f_identity,
4102 				  f_identity_len);
4103 
4104 	RRB_GET_OPTIONAL(FT_RRB_RADIUS_CUI, radius_cui, msgtype, -1);
4105 	if (f_radius_cui)
4106 		wpa_hexdump_ascii(MSG_DEBUG, "FT: CUI", f_radius_cui,
4107 				  f_radius_cui_len);
4108 
4109 	RRB_GET_OPTIONAL(FT_RRB_SESSION_TIMEOUT, session_timeout, msgtype,
4110 			 sizeof(le32));
4111 	if (f_session_timeout)
4112 		session_timeout = WPA_GET_LE32(f_session_timeout);
4113 	else
4114 		session_timeout = 0;
4115 	wpa_printf(MSG_DEBUG, "FT: session_timeout %d", session_timeout);
4116 
4117 	if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, pmk_r1_len,
4118 				f_pmk_r1_name,
4119 				pairwise, &vlan, expires_in, session_timeout,
4120 				f_identity, f_identity_len, f_radius_cui,
4121 				f_radius_cui_len) < 0)
4122 		goto out;
4123 
4124 	ret = 0;
4125 out:
4126 	bin_clear_free(plain, plain_len);
4127 
4128 	return ret;
4129 
4130 }
4131 
4132 
ft_finish_pull(struct wpa_state_machine * sm)4133 static void ft_finish_pull(struct wpa_state_machine *sm)
4134 {
4135 	int res;
4136 	u8 *resp_ies;
4137 	size_t resp_ies_len;
4138 	u16 status;
4139 
4140 	if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
4141 		return;
4142 
4143 	res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
4144 				      wpabuf_len(sm->ft_pending_req_ies),
4145 				      &resp_ies, &resp_ies_len);
4146 	if (res < 0) {
4147 		/* this loop is broken by ft_pending_pull_left_retries */
4148 		wpa_printf(MSG_DEBUG,
4149 			   "FT: Callback postponed until response is available");
4150 		return;
4151 	}
4152 	wpabuf_free(sm->ft_pending_req_ies);
4153 	sm->ft_pending_req_ies = NULL;
4154 	status = res;
4155 	wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
4156 		   " - status %u", MAC2STR(sm->addr), status);
4157 
4158 	sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
4159 			  sm->ft_pending_auth_transaction + 1, status,
4160 			  resp_ies, resp_ies_len);
4161 	os_free(resp_ies);
4162 }
4163 
4164 
4165 struct ft_get_sta_ctx {
4166 	const u8 *nonce;
4167 	const u8 *s1kh_id;
4168 	struct wpa_state_machine *sm;
4169 };
4170 
4171 
ft_get_sta_cb(struct wpa_state_machine * sm,void * ctx)4172 static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
4173 {
4174 	struct ft_get_sta_ctx *info = ctx;
4175 
4176 	if ((info->s1kh_id &&
4177 	     os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) ||
4178 	    os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
4179 		      FT_RRB_NONCE_LEN) != 0 ||
4180 	    sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
4181 		return 0;
4182 
4183 	info->sm = sm;
4184 
4185 	return 1;
4186 }
4187 
4188 
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer)4189 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
4190 			      const u8 *src_addr,
4191 			      const u8 *enc, size_t enc_len,
4192 			      const u8 *auth, size_t auth_len,
4193 			      int no_defer)
4194 {
4195 	const char *msgtype = "pull response";
4196 	int nak, ret = -1;
4197 	struct ft_get_sta_ctx ctx;
4198 	u8 s1kh_id[ETH_ALEN];
4199 	const u8 *f_nonce;
4200 	size_t f_nonce_len;
4201 
4202 	wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
4203 
4204 	RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
4205 	wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
4206 
4207 	os_memset(&ctx, 0, sizeof(ctx));
4208 	ctx.nonce = f_nonce;
4209 	if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
4210 		/* nonce not found */
4211 		wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
4212 		return -1;
4213 	}
4214 
4215 	ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
4216 			       enc, enc_len, auth, auth_len, msgtype, s1kh_id,
4217 			       no_defer ? NULL : &wpa_ft_rrb_rx_resp);
4218 	if (ret == -2) {
4219 		ret = 0;
4220 		nak = 1;
4221 	} else {
4222 		nak = 0;
4223 	}
4224 	if (ret < 0)
4225 		return -1;
4226 
4227 	ctx.s1kh_id = s1kh_id;
4228 	if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
4229 		wpa_printf(MSG_DEBUG,
4230 			   "FT: Response to a pending pull request for " MACSTR,
4231 			   MAC2STR(ctx.sm->addr));
4232 		eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
4233 		if (nak)
4234 			ctx.sm->ft_pending_pull_left_retries = 0;
4235 		ft_finish_pull(ctx.sm);
4236 	}
4237 
4238 out:
4239 	return ret;
4240 }
4241 
4242 
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer)4243 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
4244 			      const u8 *src_addr,
4245 			      const u8 *enc, size_t enc_len,
4246 			      const u8 *auth, size_t auth_len, int no_defer)
4247 {
4248 	const char *msgtype = "push";
4249 
4250 	wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
4251 
4252 	if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
4253 			     enc, enc_len, auth, auth_len, msgtype, NULL,
4254 			     no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
4255 		return -1;
4256 
4257 	return 0;
4258 }
4259 
4260 
wpa_ft_rrb_rx_seq(struct wpa_authenticator * wpa_auth,const u8 * src_addr,int type,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,struct ft_remote_seq ** rkh_seq,u8 ** key,size_t * key_len,struct ft_remote_r0kh ** r0kh_out,struct ft_remote_r1kh ** r1kh_out,struct ft_remote_r0kh ** r0kh_wildcard_out,struct ft_remote_r1kh ** r1kh_wildcard_out)4261 static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
4262 			     const u8 *src_addr, int type,
4263 			     const u8 *enc, size_t enc_len,
4264 			     const u8 *auth, size_t auth_len,
4265 			     struct ft_remote_seq **rkh_seq,
4266 			     u8 **key, size_t *key_len,
4267 			     struct ft_remote_r0kh **r0kh_out,
4268 			     struct ft_remote_r1kh **r1kh_out,
4269 			     struct ft_remote_r0kh **r0kh_wildcard_out,
4270 			     struct ft_remote_r1kh **r1kh_wildcard_out)
4271 {
4272 	struct ft_remote_r0kh *r0kh = NULL;
4273 	struct ft_remote_r1kh *r1kh = NULL;
4274 	const u8 *f_r0kh_id, *f_r1kh_id;
4275 	size_t f_r0kh_id_len, f_r1kh_id_len;
4276 	int to_r0kh, to_r1kh;
4277 	u8 *plain = NULL;
4278 	size_t plain_len = 0;
4279 	struct ft_remote_r0kh *r0kh_wildcard;
4280 	struct ft_remote_r1kh *r1kh_wildcard;
4281 
4282 	RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
4283 	RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
4284 
4285 	to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
4286 	to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);
4287 
4288 	if (to_r0kh && to_r1kh) {
4289 		wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
4290 		goto out;
4291 	}
4292 
4293 	if (!to_r0kh && !to_r1kh) {
4294 		wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
4295 		goto out;
4296 	}
4297 
4298 	if (!to_r0kh) {
4299 		wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
4300 				       &r0kh, &r0kh_wildcard);
4301 		if (!r0kh_wildcard &&
4302 		    (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
4303 			wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
4304 				    f_r0kh_id, f_r0kh_id_len);
4305 			goto out;
4306 		}
4307 		if (r0kh) {
4308 			*key = r0kh->key;
4309 			*key_len = sizeof(r0kh->key);
4310 		} else {
4311 			*key = r0kh_wildcard->key;
4312 			*key_len = sizeof(r0kh_wildcard->key);
4313 		}
4314 	}
4315 
4316 	if (!to_r1kh) {
4317 		wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
4318 				       &r1kh_wildcard);
4319 		if (!r1kh_wildcard &&
4320 		    (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
4321 			wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
4322 				    f_r1kh_id, FT_R1KH_ID_LEN);
4323 			goto out;
4324 		}
4325 		if (r1kh) {
4326 			*key = r1kh->key;
4327 			*key_len = sizeof(r1kh->key);
4328 		} else {
4329 			*key = r1kh_wildcard->key;
4330 			*key_len = sizeof(r1kh_wildcard->key);
4331 		}
4332 	}
4333 
4334 	if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
4335 			       src_addr, type, &plain, &plain_len) < 0)
4336 		goto out;
4337 
4338 	os_free(plain);
4339 
4340 	if (!to_r0kh) {
4341 		if (!r0kh)
4342 			r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
4343 						   src_addr, f_r0kh_id,
4344 						   f_r0kh_id_len,
4345 						   ftRRBseqTimeout);
4346 		if (!r0kh)
4347 			goto out;
4348 
4349 		wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
4350 		*rkh_seq = r0kh->seq;
4351 		if (r0kh_out)
4352 			*r0kh_out = r0kh;
4353 		if (r0kh_wildcard_out)
4354 			*r0kh_wildcard_out = r0kh_wildcard;
4355 	}
4356 
4357 	if (!to_r1kh) {
4358 		if (!r1kh)
4359 			r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
4360 						   src_addr, f_r1kh_id,
4361 						   ftRRBseqTimeout);
4362 		if (!r1kh)
4363 			goto out;
4364 
4365 		wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
4366 		*rkh_seq = r1kh->seq;
4367 		if (r1kh_out)
4368 			*r1kh_out = r1kh;
4369 		if (r1kh_wildcard_out)
4370 			*r1kh_wildcard_out = r1kh_wildcard;
4371 	}
4372 
4373 	return 0;
4374 out:
4375 	return -1;
4376 }
4377 
4378 
wpa_ft_rrb_rx_seq_req(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer)4379 static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
4380 				 const u8 *src_addr,
4381 				 const u8 *enc, size_t enc_len,
4382 				 const u8 *auth, size_t auth_len,
4383 				 int no_defer)
4384 {
4385 	int ret = -1;
4386 	struct ft_rrb_seq f_seq;
4387 	const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
4388 	size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
4389 	struct ft_remote_seq *rkh_seq = NULL;
4390 	u8 *packet = NULL, *key = NULL;
4391 	size_t packet_len = 0, key_len = 0;
4392 	struct tlv_list seq_resp_auth[5];
4393 
4394 	wpa_printf(MSG_DEBUG, "FT: Received sequence number request");
4395 
4396 	if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
4397 			      enc, enc_len, auth, auth_len, &rkh_seq, &key,
4398 			      &key_len, NULL, NULL, NULL, NULL) < 0)
4399 		goto out;
4400 
4401 	RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
4402 	wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);
4403 
4404 	RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
4405 	RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
4406 
4407 	if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
4408 		wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
4409 		goto out;
4410 	}
4411 
4412 	wpa_printf(MSG_DEBUG, "FT: Send sequence number response from " MACSTR
4413 		   " to " MACSTR,
4414 		   MAC2STR(wpa_auth->addr), MAC2STR(src_addr));
4415 
4416 	seq_resp_auth[0].type = FT_RRB_NONCE;
4417 	seq_resp_auth[0].len = f_nonce_len;
4418 	seq_resp_auth[0].data = f_nonce;
4419 	seq_resp_auth[1].type = FT_RRB_SEQ;
4420 	seq_resp_auth[1].len = sizeof(f_seq);
4421 	seq_resp_auth[1].data = (u8 *) &f_seq;
4422 	seq_resp_auth[2].type = FT_RRB_R0KH_ID;
4423 	seq_resp_auth[2].len = f_r0kh_id_len;
4424 	seq_resp_auth[2].data = f_r0kh_id;
4425 	seq_resp_auth[3].type = FT_RRB_R1KH_ID;
4426 	seq_resp_auth[3].len = FT_R1KH_ID_LEN;
4427 	seq_resp_auth[3].data = f_r1kh_id;
4428 	seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
4429 	seq_resp_auth[4].len = 0;
4430 	seq_resp_auth[4].data = NULL;
4431 
4432 	if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth, NULL,
4433 			     wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
4434 			     &packet, &packet_len) < 0)
4435 		goto out;
4436 
4437 	wpa_ft_rrb_oui_send(wpa_auth, src_addr,
4438 			    FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
4439 			    packet_len);
4440 
4441 out:
4442 	os_free(packet);
4443 
4444 	return ret;
4445 }
4446 
4447 
wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * enc,size_t enc_len,const u8 * auth,size_t auth_len,int no_defer)4448 static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
4449 				  const u8 *src_addr,
4450 				  const u8 *enc, size_t enc_len,
4451 				  const u8 *auth, size_t auth_len,
4452 				  int no_defer)
4453 {
4454 	u8 *key = NULL;
4455 	size_t key_len = 0;
4456 	struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
4457 	struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
4458 	const u8 *f_nonce, *f_seq;
4459 	size_t f_nonce_len, f_seq_len;
4460 	struct ft_remote_seq *rkh_seq = NULL;
4461 	struct ft_remote_item *item;
4462 	struct os_reltime now, now_remote;
4463 	int seq_ret, found;
4464 	const struct ft_rrb_seq *msg_both;
4465 	u32 msg_dom, msg_seq;
4466 
4467 	wpa_printf(MSG_DEBUG, "FT: Received sequence number response");
4468 
4469 	if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
4470 			      enc, enc_len, auth, auth_len, &rkh_seq, &key,
4471 			      &key_len, &r0kh, &r1kh, &r0kh_wildcard,
4472 			      &r1kh_wildcard) < 0)
4473 		goto out;
4474 
4475 	RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
4476 	wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
4477 		    f_nonce_len);
4478 
4479 	found = 0;
4480 	dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
4481 			 list) {
4482 		if (os_memcmp_const(f_nonce, item->nonce,
4483 				    FT_RRB_NONCE_LEN) != 0 ||
4484 		    os_get_reltime(&now) < 0 ||
4485 		    os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
4486 			continue;
4487 
4488 		found = 1;
4489 		break;
4490 	}
4491 	if (!found) {
4492 		wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
4493 		goto out;
4494 	}
4495 
4496 	if (r0kh) {
4497 		wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
4498 					  wpa_auth->conf.rkh_pos_timeout);
4499 		if (r0kh_wildcard)
4500 			os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
4501 	}
4502 
4503 	if (r1kh) {
4504 		wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
4505 					  wpa_auth->conf.rkh_pos_timeout);
4506 		if (r1kh_wildcard)
4507 			os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
4508 	}
4509 
4510 	seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
4511 				     auth_len, "seq response", 1);
4512 	if (seq_ret == FT_RRB_SEQ_OK) {
4513 		wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
4514 		wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
4515 				      auth_len, "seq response");
4516 	} else {
4517 		wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");
4518 
4519 		RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
4520 			     sizeof(*msg_both));
4521 		msg_both = (const struct ft_rrb_seq *) f_seq;
4522 
4523 		msg_dom = le_to_host32(msg_both->dom);
4524 		msg_seq = le_to_host32(msg_both->seq);
4525 		now_remote.sec = le_to_host32(msg_both->ts);
4526 		now_remote.usec = 0;
4527 
4528 		rkh_seq->rx.num_last = 2;
4529 		rkh_seq->rx.dom = msg_dom;
4530 		rkh_seq->rx.offsetidx = 0;
4531 		/* Accept some older, possibly cached packets as well */
4532 		rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
4533 			dl_list_len(&rkh_seq->rx.queue);
4534 		rkh_seq->rx.last[1] = msg_seq;
4535 
4536 		/* local time - offset = remote time
4537 		 * <=> local time - remote time = offset */
4538 		os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
4539 	}
4540 
4541 	wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);
4542 
4543 	return 0;
4544 out:
4545 	return -1;
4546 }
4547 
4548 
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)4549 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
4550 		  const u8 *data, size_t data_len)
4551 {
4552 	struct ft_rrb_frame *frame;
4553 	u16 alen;
4554 	const u8 *pos, *end, *start;
4555 	u8 action;
4556 	const u8 *sta_addr, *target_ap_addr;
4557 
4558 	wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
4559 		   MAC2STR(src_addr));
4560 
4561 	if (data_len < sizeof(*frame)) {
4562 		wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
4563 			   (unsigned long) data_len);
4564 		return -1;
4565 	}
4566 
4567 	pos = data;
4568 	frame = (struct ft_rrb_frame *) pos;
4569 	pos += sizeof(*frame);
4570 
4571 	alen = le_to_host16(frame->action_length);
4572 	wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
4573 		   "action_length=%d ap_address=" MACSTR,
4574 		   frame->frame_type, frame->packet_type, alen,
4575 		   MAC2STR(frame->ap_address));
4576 
4577 	if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
4578 		/* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
4579 		wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
4580 			   "unrecognized type %d", frame->frame_type);
4581 		return -1;
4582 	}
4583 
4584 	if (alen > data_len - sizeof(*frame)) {
4585 		wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
4586 			   "frame");
4587 		return -1;
4588 	}
4589 
4590 	wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
4591 
4592 	if (alen < 1 + 1 + 2 * ETH_ALEN) {
4593 		wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
4594 			   "room for Action Frame body); alen=%lu",
4595 			   (unsigned long) alen);
4596 		return -1;
4597 	}
4598 	start = pos;
4599 	end = pos + alen;
4600 
4601 	if (*pos != WLAN_ACTION_FT) {
4602 		wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
4603 			   "%d", *pos);
4604 		return -1;
4605 	}
4606 
4607 	pos++;
4608 	action = *pos++;
4609 	sta_addr = pos;
4610 	pos += ETH_ALEN;
4611 	target_ap_addr = pos;
4612 	pos += ETH_ALEN;
4613 	wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
4614 		   MACSTR " target_ap_addr=" MACSTR,
4615 		   action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
4616 
4617 	if (frame->packet_type == FT_PACKET_REQUEST) {
4618 		wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
4619 
4620 		if (action != 1) {
4621 			wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
4622 				   "RRB Request", action);
4623 			return -1;
4624 		}
4625 
4626 		if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
4627 			wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
4628 				   "RRB Request does not match with own "
4629 				   "address");
4630 			return -1;
4631 		}
4632 
4633 		if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
4634 					  sta_addr, pos, end - pos) < 0)
4635 			return -1;
4636 	} else if (frame->packet_type == FT_PACKET_RESPONSE) {
4637 		u16 status_code;
4638 
4639 		if (end - pos < 2) {
4640 			wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
4641 				   "code in RRB Response");
4642 			return -1;
4643 		}
4644 		status_code = WPA_GET_LE16(pos);
4645 
4646 		wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
4647 			   "(status_code=%d)", status_code);
4648 
4649 		if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
4650 			return -1;
4651 	} else {
4652 		wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
4653 			   "packet_type %d", frame->packet_type);
4654 		return -1;
4655 	}
4656 
4657 	return 0;
4658 }
4659 
4660 
wpa_ft_rrb_oui_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * dst_addr,u8 oui_suffix,const u8 * data,size_t data_len)4661 void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
4662 		       const u8 *dst_addr, u8 oui_suffix, const u8 *data,
4663 		       size_t data_len)
4664 {
4665 	const u8 *auth, *enc;
4666 	size_t alen, elen;
4667 	int no_defer = 0;
4668 
4669 	wpa_printf(MSG_DEBUG, "FT: RRB-OUI(" MACSTR
4670 		   ") received frame from remote AP "
4671 		   MACSTR " oui_suffix=%u dst=" MACSTR,
4672 		   MAC2STR(wpa_auth->addr), MAC2STR(src_addr), oui_suffix,
4673 		   MAC2STR(dst_addr));
4674 	wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", data, data_len);
4675 
4676 	if (is_multicast_ether_addr(src_addr)) {
4677 		wpa_printf(MSG_DEBUG,
4678 			   "FT: RRB-OUI received frame from multicast address "
4679 			   MACSTR, MAC2STR(src_addr));
4680 		return;
4681 	}
4682 
4683 	if (is_multicast_ether_addr(dst_addr))
4684 		no_defer = 1;
4685 
4686 	if (data_len < sizeof(u16)) {
4687 		wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
4688 		return;
4689 	}
4690 
4691 	alen = WPA_GET_LE16(data);
4692 	if (data_len < sizeof(u16) + alen) {
4693 		wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
4694 		return;
4695 	}
4696 
4697 	auth = data + sizeof(u16);
4698 	wpa_hexdump(MSG_MSGDUMP, "FT: Authenticated payload", auth, alen);
4699 	enc = data + sizeof(u16) + alen;
4700 	elen = data_len - sizeof(u16) - alen;
4701 	wpa_hexdump(MSG_MSGDUMP, "FT: Encrypted payload", enc, elen);
4702 
4703 	switch (oui_suffix) {
4704 	case FT_PACKET_R0KH_R1KH_PULL:
4705 		wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
4706 				   no_defer);
4707 		break;
4708 	case FT_PACKET_R0KH_R1KH_RESP:
4709 		wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
4710 				   no_defer);
4711 		break;
4712 	case FT_PACKET_R0KH_R1KH_PUSH:
4713 		wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
4714 				   no_defer);
4715 		break;
4716 	case FT_PACKET_R0KH_R1KH_SEQ_REQ:
4717 		wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
4718 				      no_defer);
4719 		break;
4720 	case FT_PACKET_R0KH_R1KH_SEQ_RESP:
4721 		wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
4722 				       alen, no_defer);
4723 		break;
4724 	}
4725 }
4726 
4727 
wpa_ft_generate_pmk_r1(struct wpa_authenticator * wpa_auth,struct wpa_ft_pmk_r0_sa * pmk_r0,struct ft_remote_r1kh * r1kh,const u8 * s1kh_id)4728 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
4729 				  struct wpa_ft_pmk_r0_sa *pmk_r0,
4730 				  struct ft_remote_r1kh *r1kh,
4731 				  const u8 *s1kh_id)
4732 {
4733 	u8 *packet;
4734 	size_t packet_len;
4735 	struct ft_rrb_seq f_seq;
4736 	struct tlv_list push[] = {
4737 		{ .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
4738 		  .data = s1kh_id },
4739 		{ .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
4740 		  .data = pmk_r0->pmk_r0_name },
4741 		{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
4742 	};
4743 	struct tlv_list push_auth[] = {
4744 		{ .type = FT_RRB_SEQ, .len = sizeof(f_seq),
4745 		  .data = (u8 *) &f_seq },
4746 		{ .type = FT_RRB_R0KH_ID,
4747 		  .len = wpa_auth->conf.r0_key_holder_len,
4748 		  .data = wpa_auth->conf.r0_key_holder },
4749 		{ .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
4750 		  .data = r1kh->id },
4751 		{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
4752 	};
4753 
4754 	if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
4755 		wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
4756 		return -1;
4757 	}
4758 
4759 	wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 push from " MACSTR
4760 		   " to remote R0KH address " MACSTR,
4761 		   MAC2STR(wpa_auth->addr), MAC2STR(r1kh->addr));
4762 
4763 	if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
4764 				r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
4765 				FT_PACKET_R0KH_R1KH_PUSH,
4766 				&packet, &packet_len) < 0)
4767 		return -1;
4768 
4769 	wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
4770 			    packet, packet_len);
4771 
4772 	os_free(packet);
4773 	return 0;
4774 }
4775 
4776 
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)4777 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
4778 {
4779 	struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
4780 	struct wpa_ft_pmk_r0_sa *r0, *r0found = NULL;
4781 	struct ft_remote_r1kh *r1kh;
4782 
4783 	if (!wpa_auth->conf.pmk_r1_push)
4784 		return;
4785 	if (!wpa_auth->conf.r1kh_list)
4786 		return;
4787 
4788 	dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
4789 		if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) {
4790 			r0found = r0;
4791 			break;
4792 		}
4793 	}
4794 
4795 	r0 = r0found;
4796 	if (r0 == NULL || r0->pmk_r1_pushed)
4797 		return;
4798 	r0->pmk_r1_pushed = 1;
4799 
4800 	wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
4801 		   "for STA " MACSTR, MAC2STR(addr));
4802 
4803 	for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
4804 		if (is_zero_ether_addr(r1kh->addr) ||
4805 		    is_zero_ether_addr(r1kh->id))
4806 			continue;
4807 		if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
4808 			continue;
4809 		wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
4810 	}
4811 }
4812 
4813 #endif /* CONFIG_IEEE80211R_AP */
4814