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 "drivers/driver.h"
18 #include "crypto/aes.h"
19 #include "crypto/aes_siv.h"
20 #include "crypto/aes_wrap.h"
21 #include "crypto/sha384.h"
22 #include "crypto/random.h"
23 #include "ap_config.h"
24 #include "ieee802_11.h"
25 #include "wmm.h"
26 #include "wpa_auth.h"
27 #include "wpa_auth_i.h"
28 #include "pmksa_cache_auth.h"
29
30
31 #ifdef CONFIG_IEEE80211R_AP
32
33 const unsigned int ftRRBseqTimeout = 10;
34 const unsigned int ftRRBmaxQueueLen = 100;
35
36
37 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
38 const u8 *current_ap, const u8 *sta_addr,
39 u16 status, const u8 *resp_ies,
40 size_t resp_ies_len);
41 static void ft_finish_pull(struct wpa_state_machine *sm);
42 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
43 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);
44
45 struct tlv_list {
46 u16 type;
47 size_t len;
48 const u8 *data;
49 };
50
51
52 /**
53 * wpa_ft_rrb_decrypt - Decrypt FT RRB message
54 * @key: AES-SIV key for AEAD
55 * @key_len: Length of key in octets
56 * @enc: Pointer to encrypted TLVs
57 * @enc_len: Length of encrypted TLVs in octets
58 * @auth: Pointer to authenticated TLVs
59 * @auth_len: Length of authenticated TLVs in octets
60 * @src_addr: MAC address of the frame sender
61 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
62 * @plain: Pointer to return the pointer to the allocated plaintext buffer;
63 * needs to be freed by the caller if not NULL;
64 * will only be returned on success
65 * @plain_len: Pointer to return the length of the allocated plaintext buffer
66 * in octets
67 * Returns: 0 on success, -1 on error
68 */
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)69 static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
70 const u8 *enc, size_t enc_len,
71 const u8 *auth, const size_t auth_len,
72 const u8 *src_addr, u8 type,
73 u8 **plain, size_t *plain_size)
74 {
75 const u8 *ad[3] = { src_addr, auth, &type };
76 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
77
78 wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
79 MAC2STR(src_addr), type);
80 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
81 wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs", enc, enc_len);
82 wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);
83
84 if (!key) { /* skip decryption */
85 *plain = os_memdup(enc, enc_len);
86 if (enc_len > 0 && !*plain)
87 goto err;
88
89 *plain_size = enc_len;
90
91 return 0;
92 }
93
94 *plain = NULL;
95
96 /* SIV overhead */
97 if (enc_len < AES_BLOCK_SIZE)
98 goto err;
99
100 *plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
101 if (!*plain)
102 goto err;
103
104 if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
105 *plain) < 0) {
106 if (enc_len < AES_BLOCK_SIZE + 2)
107 goto err;
108
109 /* Try to work around Ethernet devices that add extra
110 * two octet padding even if the frame is longer than
111 * the minimum Ethernet frame. */
112 enc_len -= 2;
113 if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
114 *plain) < 0)
115 goto err;
116 }
117
118 *plain_size = enc_len - AES_BLOCK_SIZE;
119 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
120 *plain, *plain_size);
121 return 0;
122 err:
123 os_free(*plain);
124 *plain = NULL;
125 *plain_size = 0;
126
127 wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");
128
129 return -1;
130 }
131
132
133 /* get first tlv record in packet matching type
134 * @data (decrypted) packet
135 * @return 0 on success else -1
136 */
wpa_ft_rrb_get_tlv(const u8 * plain,size_t plain_len,u16 type,size_t * tlv_len,const u8 ** tlv_data)137 static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
138 u16 type, size_t *tlv_len, const u8 **tlv_data)
139 {
140 const struct ft_rrb_tlv *f;
141 size_t left;
142 le16 type16;
143 size_t len;
144
145 left = plain_len;
146 type16 = host_to_le16(type);
147
148 while (left >= sizeof(*f)) {
149 f = (const struct ft_rrb_tlv *) plain;
150
151 left -= sizeof(*f);
152 plain += sizeof(*f);
153 len = le_to_host16(f->len);
154
155 if (left < len) {
156 wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
157 break;
158 }
159
160 if (f->type == type16) {
161 *tlv_len = len;
162 *tlv_data = plain;
163 return 0;
164 }
165
166 left -= len;
167 plain += len;
168 }
169
170 return -1;
171 }
172
173
wpa_ft_rrb_dump(const u8 * plain,const size_t plain_len)174 static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
175 {
176 const struct ft_rrb_tlv *f;
177 size_t left;
178 size_t len;
179
180 left = plain_len;
181
182 wpa_printf(MSG_DEBUG, "FT: RRB dump message");
183 while (left >= sizeof(*f)) {
184 f = (const struct ft_rrb_tlv *) plain;
185
186 left -= sizeof(*f);
187 plain += sizeof(*f);
188 len = le_to_host16(f->len);
189
190 wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
191 le_to_host16(f->type), len);
192
193 if (left < len) {
194 wpa_printf(MSG_DEBUG,
195 "FT: RRB message truncated: left %zu bytes, need %zu",
196 left, len);
197 break;
198 }
199
200 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);
201
202 left -= len;
203 plain += len;
204 }
205
206 if (left > 0)
207 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);
208
209 wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
210 }
211
212
cmp_int(const void * a,const void * b)213 static int cmp_int(const void *a, const void *b)
214 {
215 int x, y;
216
217 x = *((int *) a);
218 y = *((int *) b);
219 return x - y;
220 }
221
222
wpa_ft_rrb_get_tlv_vlan(const u8 * plain,const size_t plain_len,struct vlan_description * vlan)223 static int wpa_ft_rrb_get_tlv_vlan(const u8 *plain, const size_t plain_len,
224 struct vlan_description *vlan)
225 {
226 struct ft_rrb_tlv *f;
227 size_t left;
228 size_t len;
229 int taggedidx;
230 int vlan_id;
231 int type;
232
233 left = plain_len;
234 taggedidx = 0;
235 os_memset(vlan, 0, sizeof(*vlan));
236
237 while (left >= sizeof(*f)) {
238 f = (struct ft_rrb_tlv *) plain;
239
240 left -= sizeof(*f);
241 plain += sizeof(*f);
242
243 len = le_to_host16(f->len);
244 type = le_to_host16(f->type);
245
246 if (left < len) {
247 wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
248 return -1;
249 }
250
251 if (type != FT_RRB_VLAN_UNTAGGED && type != FT_RRB_VLAN_TAGGED)
252 goto skip;
253
254 if (type == FT_RRB_VLAN_UNTAGGED && len != sizeof(le16)) {
255 wpa_printf(MSG_DEBUG,
256 "FT: RRB VLAN_UNTAGGED invalid length");
257 return -1;
258 }
259
260 if (type == FT_RRB_VLAN_TAGGED && len % sizeof(le16) != 0) {
261 wpa_printf(MSG_DEBUG,
262 "FT: RRB VLAN_TAGGED invalid length");
263 return -1;
264 }
265
266 while (len >= sizeof(le16)) {
267 vlan_id = WPA_GET_LE16(plain);
268 plain += sizeof(le16);
269 left -= sizeof(le16);
270 len -= sizeof(le16);
271
272 if (vlan_id <= 0 || vlan_id > MAX_VLAN_ID) {
273 wpa_printf(MSG_DEBUG,
274 "FT: RRB VLAN ID invalid %d",
275 vlan_id);
276 continue;
277 }
278
279 if (type == FT_RRB_VLAN_UNTAGGED)
280 vlan->untagged = vlan_id;
281
282 if (type == FT_RRB_VLAN_TAGGED &&
283 taggedidx < MAX_NUM_TAGGED_VLAN) {
284 vlan->tagged[taggedidx] = vlan_id;
285 taggedidx++;
286 } else if (type == FT_RRB_VLAN_TAGGED) {
287 wpa_printf(MSG_DEBUG, "FT: RRB too many VLANs");
288 }
289 }
290
291 skip:
292 left -= len;
293 plain += len;
294 }
295
296 if (taggedidx)
297 qsort(vlan->tagged, taggedidx, sizeof(int), cmp_int);
298
299 vlan->notempty = vlan->untagged || vlan->tagged[0];
300
301 return 0;
302 }
303
304
wpa_ft_tlv_len(const struct tlv_list * tlvs)305 static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
306 {
307 size_t tlv_len = 0;
308 int i;
309
310 if (!tlvs)
311 return 0;
312
313 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
314 tlv_len += sizeof(struct ft_rrb_tlv);
315 tlv_len += tlvs[i].len;
316 }
317
318 return tlv_len;
319 }
320
321
wpa_ft_tlv_lin(const struct tlv_list * tlvs,u8 * start,u8 * endpos)322 static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
323 u8 *endpos)
324 {
325 int i;
326 size_t tlv_len;
327 struct ft_rrb_tlv *hdr;
328 u8 *pos;
329
330 if (!tlvs)
331 return 0;
332
333 tlv_len = 0;
334 pos = start;
335 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
336 if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
337 return tlv_len;
338 tlv_len += sizeof(*hdr);
339 hdr = (struct ft_rrb_tlv *) pos;
340 hdr->type = host_to_le16(tlvs[i].type);
341 hdr->len = host_to_le16(tlvs[i].len);
342 pos = start + tlv_len;
343
344 if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
345 return tlv_len;
346 if (tlvs[i].len == 0)
347 continue;
348 tlv_len += tlvs[i].len;
349 os_memcpy(pos, tlvs[i].data, tlvs[i].len);
350 pos = start + tlv_len;
351 }
352
353 return tlv_len;
354 }
355
356
wpa_ft_vlan_len(const struct vlan_description * vlan)357 static size_t wpa_ft_vlan_len(const struct vlan_description *vlan)
358 {
359 size_t tlv_len = 0;
360 int i;
361
362 if (!vlan || !vlan->notempty)
363 return 0;
364
365 if (vlan->untagged) {
366 tlv_len += sizeof(struct ft_rrb_tlv);
367 tlv_len += sizeof(le16);
368 }
369 if (vlan->tagged[0])
370 tlv_len += sizeof(struct ft_rrb_tlv);
371 for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++)
372 tlv_len += sizeof(le16);
373
374 return tlv_len;
375 }
376
377
wpa_ft_vlan_lin(const struct vlan_description * vlan,u8 * start,u8 * endpos)378 static size_t wpa_ft_vlan_lin(const struct vlan_description *vlan,
379 u8 *start, u8 *endpos)
380 {
381 size_t tlv_len;
382 int i, len;
383 struct ft_rrb_tlv *hdr;
384 u8 *pos = start;
385
386 if (!vlan || !vlan->notempty)
387 return 0;
388
389 tlv_len = 0;
390 if (vlan->untagged) {
391 tlv_len += sizeof(*hdr);
392 if (start + tlv_len > endpos)
393 return tlv_len;
394 hdr = (struct ft_rrb_tlv *) pos;
395 hdr->type = host_to_le16(FT_RRB_VLAN_UNTAGGED);
396 hdr->len = host_to_le16(sizeof(le16));
397 pos = start + tlv_len;
398
399 tlv_len += sizeof(le16);
400 if (start + tlv_len > endpos)
401 return tlv_len;
402 WPA_PUT_LE16(pos, vlan->untagged);
403 pos = start + tlv_len;
404 }
405
406 if (!vlan->tagged[0])
407 return tlv_len;
408
409 tlv_len += sizeof(*hdr);
410 if (start + tlv_len > endpos)
411 return tlv_len;
412 hdr = (struct ft_rrb_tlv *) pos;
413 hdr->type = host_to_le16(FT_RRB_VLAN_TAGGED);
414 len = 0; /* len is computed below */
415 pos = start + tlv_len;
416
417 for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) {
418 tlv_len += sizeof(le16);
419 if (start + tlv_len > endpos)
420 break;
421 len += sizeof(le16);
422 WPA_PUT_LE16(pos, vlan->tagged[i]);
423 pos = start + tlv_len;
424 }
425
426 hdr->len = host_to_le16(len);
427
428 return tlv_len;
429 }
430
431
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)432 static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
433 const struct tlv_list *tlvs2,
434 const struct vlan_description *vlan,
435 u8 **plain, size_t *plain_len)
436 {
437 u8 *pos, *endpos;
438 size_t tlv_len;
439
440 tlv_len = wpa_ft_tlv_len(tlvs1);
441 tlv_len += wpa_ft_tlv_len(tlvs2);
442 tlv_len += wpa_ft_vlan_len(vlan);
443
444 *plain_len = tlv_len;
445 *plain = os_zalloc(tlv_len);
446 if (!*plain) {
447 wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
448 goto err;
449 }
450
451 pos = *plain;
452 endpos = *plain + tlv_len;
453 pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
454 pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
455 pos += wpa_ft_vlan_lin(vlan, pos, endpos);
456
457 /* sanity check */
458 if (pos != endpos) {
459 wpa_printf(MSG_ERROR, "FT: Length error building RRB");
460 goto err;
461 }
462
463 return 0;
464
465 err:
466 os_free(*plain);
467 *plain = NULL;
468 *plain_len = 0;
469 return -1;
470 }
471
472
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)473 static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
474 const u8 *plain, const size_t plain_len,
475 const u8 *auth, const size_t auth_len,
476 const u8 *src_addr, u8 type, u8 *enc)
477 {
478 const u8 *ad[3] = { src_addr, auth, &type };
479 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
480
481 wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
482 MAC2STR(src_addr), type);
483 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
484 plain, plain_len);
485 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
486 wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);
487
488 if (!key) {
489 /* encryption not needed, return plaintext as packet */
490 os_memcpy(enc, plain, plain_len);
491 } else if (aes_siv_encrypt(key, key_len, plain, plain_len,
492 3, ad, ad_len, enc) < 0) {
493 wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
494 return -1;
495 }
496 wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs",
497 enc, plain_len + AES_BLOCK_SIZE);
498
499 return 0;
500 }
501
502
503 /**
504 * wpa_ft_rrb_build - Build and encrypt an FT RRB message
505 * @key: AES-SIV key for AEAD
506 * @key_len: Length of key in octets
507 * @tlvs_enc0: First set of to-be-encrypted TLVs
508 * @tlvs_enc1: Second set of to-be-encrypted TLVs
509 * @tlvs_auth: Set of to-be-authenticated TLVs
510 * @src_addr: MAC address of the frame sender
511 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
512 * @packet Pointer to return the pointer to the allocated packet buffer;
513 * needs to be freed by the caller if not null;
514 * will only be returned on success
515 * @packet_len: Pointer to return the length of the allocated buffer in octets
516 * Returns: 0 on success, -1 on error
517 */
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)518 static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
519 const struct tlv_list *tlvs_enc0,
520 const struct tlv_list *tlvs_enc1,
521 const struct tlv_list *tlvs_auth,
522 const struct vlan_description *vlan,
523 const u8 *src_addr, u8 type,
524 u8 **packet, size_t *packet_len)
525 {
526 u8 *plain = NULL, *auth = NULL, *pos, *tmp;
527 size_t plain_len = 0, auth_len = 0;
528 int ret = -1;
529 size_t pad_len = 0;
530
531 *packet = NULL;
532 if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, vlan, &plain, &plain_len) < 0)
533 goto out;
534
535 if (wpa_ft_rrb_lin(tlvs_auth, NULL, NULL, &auth, &auth_len) < 0)
536 goto out;
537
538 *packet_len = sizeof(u16) + auth_len + plain_len;
539 if (key)
540 *packet_len += AES_BLOCK_SIZE;
541 #define RRB_MIN_MSG_LEN 64
542 if (*packet_len < RRB_MIN_MSG_LEN) {
543 pad_len = RRB_MIN_MSG_LEN - *packet_len;
544 if (pad_len < sizeof(struct ft_rrb_tlv))
545 pad_len = sizeof(struct ft_rrb_tlv);
546 wpa_printf(MSG_DEBUG,
547 "FT: Pad message to minimum Ethernet frame length (%d --> %d)",
548 (int) *packet_len, (int) (*packet_len + pad_len));
549 *packet_len += pad_len;
550 tmp = os_realloc(auth, auth_len + pad_len);
551 if (!tmp)
552 goto out;
553 auth = tmp;
554 pos = auth + auth_len;
555 WPA_PUT_LE16(pos, FT_RRB_LAST_EMPTY);
556 pos += 2;
557 WPA_PUT_LE16(pos, pad_len - sizeof(struct ft_rrb_tlv));
558 pos += 2;
559 os_memset(pos, 0, pad_len - sizeof(struct ft_rrb_tlv));
560 auth_len += pad_len;
561
562 }
563 *packet = os_zalloc(*packet_len);
564 if (!*packet)
565 goto out;
566
567 pos = *packet;
568 WPA_PUT_LE16(pos, auth_len);
569 pos += 2;
570 os_memcpy(pos, auth, auth_len);
571 pos += auth_len;
572 if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
573 auth_len, src_addr, type, pos) < 0)
574 goto out;
575 wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", *packet, *packet_len);
576
577 ret = 0;
578
579 out:
580 bin_clear_free(plain, plain_len);
581 os_free(auth);
582
583 if (ret) {
584 wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
585 os_free(*packet);
586 *packet = NULL;
587 *packet_len = 0;
588 }
589
590 return ret;
591 }
592
593
594 #define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
595 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
596 &f_##field##_len, &f_##field) < 0 || \
597 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
598 wpa_printf(MSG_INFO, "FT: Missing required " #field \
599 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
600 wpa_ft_rrb_dump(srcfield, srcfield##_len); \
601 goto out; \
602 } \
603 } while (0)
604
605 #define RRB_GET(type, field, txt, checklength) \
606 RRB_GET_SRC(plain, type, field, txt, checklength)
607 #define RRB_GET_AUTH(type, field, txt, checklength) \
608 RRB_GET_SRC(auth, type, field, txt, checklength)
609
610 #define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
611 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
612 &f_##field##_len, &f_##field) < 0 || \
613 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
614 wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
615 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
616 f_##field##_len = 0; \
617 f_##field = NULL; \
618 } \
619 } while (0)
620
621 #define RRB_GET_OPTIONAL(type, field, txt, checklength) \
622 RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
623 #define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
624 RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)
625
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)626 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
627 const u8 *data, size_t data_len)
628 {
629 if (wpa_auth->cb->send_ether == NULL)
630 return -1;
631 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
632 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
633 data, data_len);
634 }
635
636
wpa_ft_rrb_oui_send(struct wpa_authenticator * wpa_auth,const u8 * dst,u8 oui_suffix,const u8 * data,size_t data_len)637 static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
638 const u8 *dst, u8 oui_suffix,
639 const u8 *data, size_t data_len)
640 {
641 if (!wpa_auth->cb->send_oui)
642 return -1;
643 wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR " (len=%u)",
644 oui_suffix, MAC2STR(dst), (unsigned int) data_len);
645 return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data,
646 data_len);
647 }
648
649
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)650 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
651 const u8 *dst, const u8 *data, size_t data_len)
652 {
653 if (wpa_auth->cb->send_ft_action == NULL)
654 return -1;
655 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
656 data, data_len);
657 }
658
659
wpa_ft_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)660 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
661 const u8 *addr, const u8 *p2p_dev_addr,
662 const u8 *prev_psk)
663 {
664 if (wpa_auth->cb->get_psk == NULL)
665 return NULL;
666 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
667 prev_psk, NULL, NULL);
668 }
669
670
671 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)672 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
673 {
674 if (wpa_auth->cb->add_sta == NULL)
675 return NULL;
676 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
677 }
678
679
wpa_ft_set_vlan(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,struct vlan_description * vlan)680 static int wpa_ft_set_vlan(struct wpa_authenticator *wpa_auth,
681 const u8 *sta_addr, struct vlan_description *vlan)
682 {
683 if (!wpa_auth->cb->set_vlan)
684 return -1;
685 return wpa_auth->cb->set_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
686 }
687
688
wpa_ft_get_vlan(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,struct vlan_description * vlan)689 static int wpa_ft_get_vlan(struct wpa_authenticator *wpa_auth,
690 const u8 *sta_addr, struct vlan_description *vlan)
691 {
692 if (!wpa_auth->cb->get_vlan)
693 return -1;
694 return wpa_auth->cb->get_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
695 }
696
697
698 static int
wpa_ft_set_identity(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * identity,size_t identity_len)699 wpa_ft_set_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
700 const u8 *identity, size_t identity_len)
701 {
702 if (!wpa_auth->cb->set_identity)
703 return -1;
704 return wpa_auth->cb->set_identity(wpa_auth->cb_ctx, sta_addr, identity,
705 identity_len);
706 }
707
708
709 static size_t
wpa_ft_get_identity(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 ** buf)710 wpa_ft_get_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
711 const u8 **buf)
712 {
713 *buf = NULL;
714 if (!wpa_auth->cb->get_identity)
715 return 0;
716 return wpa_auth->cb->get_identity(wpa_auth->cb_ctx, sta_addr, buf);
717 }
718
719
720 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)721 wpa_ft_set_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
722 const u8 *radius_cui, size_t radius_cui_len)
723 {
724 if (!wpa_auth->cb->set_radius_cui)
725 return -1;
726 return wpa_auth->cb->set_radius_cui(wpa_auth->cb_ctx, sta_addr,
727 radius_cui, radius_cui_len);
728 }
729
730
731 static size_t
wpa_ft_get_radius_cui(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 ** buf)732 wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
733 const u8 **buf)
734 {
735 *buf = NULL;
736 if (!wpa_auth->cb->get_radius_cui)
737 return 0;
738 return wpa_auth->cb->get_radius_cui(wpa_auth->cb_ctx, sta_addr, buf);
739 }
740
741
742 static void
wpa_ft_set_session_timeout(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,int session_timeout)743 wpa_ft_set_session_timeout(struct wpa_authenticator *wpa_auth,
744 const u8 *sta_addr, int session_timeout)
745 {
746 if (!wpa_auth->cb->set_session_timeout)
747 return;
748 wpa_auth->cb->set_session_timeout(wpa_auth->cb_ctx, sta_addr,
749 session_timeout);
750 }
751
752
753 static int
wpa_ft_get_session_timeout(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)754 wpa_ft_get_session_timeout(struct wpa_authenticator *wpa_auth,
755 const u8 *sta_addr)
756 {
757 if (!wpa_auth->cb->get_session_timeout)
758 return 0;
759 return wpa_auth->cb->get_session_timeout(wpa_auth->cb_ctx, sta_addr);
760 }
761
762
wpa_ft_add_tspec(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,u8 * tspec_ie,size_t tspec_ielen)763 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
764 const u8 *sta_addr,
765 u8 *tspec_ie, size_t tspec_ielen)
766 {
767 if (wpa_auth->cb->add_tspec == NULL) {
768 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
769 return -1;
770 }
771 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
772 tspec_ielen);
773 }
774
775
776 #ifdef CONFIG_OCV
wpa_channel_info(struct wpa_authenticator * wpa_auth,struct wpa_channel_info * ci)777 static int wpa_channel_info(struct wpa_authenticator *wpa_auth,
778 struct wpa_channel_info *ci)
779 {
780 if (!wpa_auth->cb->channel_info)
781 return -1;
782 return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci);
783 }
784 #endif /* CONFIG_OCV */
785
786
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)787 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
788 {
789 u8 *pos = buf;
790 u8 capab;
791 if (len < 2 + sizeof(struct rsn_mdie))
792 return -1;
793
794 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
795 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
796 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
797 pos += MOBILITY_DOMAIN_ID_LEN;
798 capab = 0;
799 if (conf->ft_over_ds)
800 capab |= RSN_FT_CAPAB_FT_OVER_DS;
801 *pos++ = capab;
802
803 return pos - buf;
804 }
805
806
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)807 int wpa_write_ftie(struct wpa_auth_config *conf, int use_sha384,
808 const u8 *r0kh_id, size_t r0kh_id_len,
809 const u8 *anonce, const u8 *snonce,
810 u8 *buf, size_t len, const u8 *subelem,
811 size_t subelem_len)
812 {
813 u8 *pos = buf, *ielen;
814 size_t hdrlen = use_sha384 ? sizeof(struct rsn_ftie_sha384) :
815 sizeof(struct rsn_ftie);
816
817 if (len < 2 + hdrlen + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
818 subelem_len)
819 return -1;
820
821 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
822 ielen = pos++;
823
824 if (use_sha384) {
825 struct rsn_ftie_sha384 *hdr = (struct rsn_ftie_sha384 *) pos;
826
827 os_memset(hdr, 0, sizeof(*hdr));
828 pos += sizeof(*hdr);
829 WPA_PUT_LE16(hdr->mic_control, 0);
830 if (anonce)
831 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
832 if (snonce)
833 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
834 } else {
835 struct rsn_ftie *hdr = (struct rsn_ftie *) pos;
836
837 os_memset(hdr, 0, sizeof(*hdr));
838 pos += sizeof(*hdr);
839 WPA_PUT_LE16(hdr->mic_control, 0);
840 if (anonce)
841 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
842 if (snonce)
843 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
844 }
845
846 /* Optional Parameters */
847 *pos++ = FTIE_SUBELEM_R1KH_ID;
848 *pos++ = FT_R1KH_ID_LEN;
849 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
850 pos += FT_R1KH_ID_LEN;
851
852 if (r0kh_id) {
853 *pos++ = FTIE_SUBELEM_R0KH_ID;
854 *pos++ = r0kh_id_len;
855 os_memcpy(pos, r0kh_id, r0kh_id_len);
856 pos += r0kh_id_len;
857 }
858
859 if (subelem) {
860 os_memcpy(pos, subelem, subelem_len);
861 pos += subelem_len;
862 }
863
864 *ielen = pos - buf - 2;
865
866 return pos - buf;
867 }
868
869
870 /* A packet to be handled after seq response */
871 struct ft_remote_item {
872 struct dl_list list;
873
874 u8 nonce[FT_RRB_NONCE_LEN];
875 struct os_reltime nonce_ts;
876
877 u8 src_addr[ETH_ALEN];
878 u8 *enc;
879 size_t enc_len;
880 u8 *auth;
881 size_t auth_len;
882 int (*cb)(struct wpa_authenticator *wpa_auth,
883 const u8 *src_addr,
884 const u8 *enc, size_t enc_len,
885 const u8 *auth, size_t auth_len,
886 int no_defer);
887 };
888
889
wpa_ft_rrb_seq_free(struct ft_remote_item * item)890 static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
891 {
892 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
893 dl_list_del(&item->list);
894 bin_clear_free(item->enc, item->enc_len);
895 os_free(item->auth);
896 os_free(item);
897 }
898
899
wpa_ft_rrb_seq_flush(struct wpa_authenticator * wpa_auth,struct ft_remote_seq * rkh_seq,int cb)900 static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
901 struct ft_remote_seq *rkh_seq, int cb)
902 {
903 struct ft_remote_item *item, *n;
904
905 dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
906 struct ft_remote_item, list) {
907 if (cb && item->cb)
908 item->cb(wpa_auth, item->src_addr, item->enc,
909 item->enc_len, item->auth, item->auth_len, 1);
910 wpa_ft_rrb_seq_free(item);
911 }
912 }
913
914
wpa_ft_rrb_seq_timeout(void * eloop_ctx,void * timeout_ctx)915 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
916 {
917 struct ft_remote_item *item = timeout_ctx;
918
919 wpa_ft_rrb_seq_free(item);
920 }
921
922
923 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))924 wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
925 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
926 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
927 const u8 *f_r1kh_id, const u8 *key, size_t key_len,
928 const u8 *enc, size_t enc_len,
929 const u8 *auth, size_t auth_len,
930 int (*cb)(struct wpa_authenticator *wpa_auth,
931 const u8 *src_addr,
932 const u8 *enc, size_t enc_len,
933 const u8 *auth, size_t auth_len,
934 int no_defer))
935 {
936 struct ft_remote_item *item = NULL;
937 u8 *packet = NULL;
938 size_t packet_len;
939 struct tlv_list seq_req_auth[] = {
940 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
941 .data = NULL /* to be filled: item->nonce */ },
942 { .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
943 .data = f_r0kh_id },
944 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
945 .data = f_r1kh_id },
946 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
947 };
948
949 if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
950 wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
951 goto err;
952 }
953
954 wpa_printf(MSG_DEBUG, "FT: Send out sequence number request to " MACSTR,
955 MAC2STR(src_addr));
956 item = os_zalloc(sizeof(*item));
957 if (!item)
958 goto err;
959
960 os_memcpy(item->src_addr, src_addr, ETH_ALEN);
961 item->cb = cb;
962
963 if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
964 wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
965 goto err;
966 }
967
968 if (os_get_reltime(&item->nonce_ts) < 0)
969 goto err;
970
971 if (enc && enc_len > 0) {
972 item->enc = os_memdup(enc, enc_len);
973 item->enc_len = enc_len;
974 if (!item->enc)
975 goto err;
976 }
977
978 if (auth && auth_len > 0) {
979 item->auth = os_memdup(auth, auth_len);
980 item->auth_len = auth_len;
981 if (!item->auth)
982 goto err;
983 }
984
985 eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
986 wpa_auth, item);
987
988 seq_req_auth[0].data = item->nonce;
989
990 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth, NULL,
991 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
992 &packet, &packet_len) < 0) {
993 item = NULL; /* some other seq resp might still accept this */
994 goto err;
995 }
996
997 dl_list_add(&rkh_seq->rx.queue, &item->list);
998
999 wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
1000 packet, packet_len);
1001
1002 os_free(packet);
1003
1004 return 0;
1005 err:
1006 wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
1007 if (item) {
1008 os_free(item->auth);
1009 bin_clear_free(item->enc, item->enc_len);
1010 os_free(item);
1011 }
1012
1013 return -1;
1014 }
1015
1016
1017 #define FT_RRB_SEQ_OK 0
1018 #define FT_RRB_SEQ_DROP 1
1019 #define FT_RRB_SEQ_DEFER 2
1020
1021 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)1022 wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
1023 const u8 *enc, size_t enc_len,
1024 const u8 *auth, size_t auth_len,
1025 const char *msgtype, int no_defer)
1026 {
1027 const u8 *f_seq;
1028 size_t f_seq_len;
1029 const struct ft_rrb_seq *msg_both;
1030 u32 msg_seq, msg_off, rkh_off;
1031 struct os_reltime now;
1032 unsigned int i;
1033
1034 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
1035 wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
1036 msg_both = (const struct ft_rrb_seq *) f_seq;
1037
1038 if (rkh_seq->rx.num_last == 0) {
1039 /* first packet from remote */
1040 goto defer;
1041 }
1042
1043 if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
1044 /* remote might have rebooted */
1045 goto defer;
1046 }
1047
1048 if (os_get_reltime(&now) == 0) {
1049 u32 msg_ts_now_remote, msg_ts_off;
1050 struct os_reltime now_remote;
1051
1052 os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
1053 msg_ts_now_remote = now_remote.sec;
1054 msg_ts_off = le_to_host32(msg_both->ts) -
1055 (msg_ts_now_remote - ftRRBseqTimeout);
1056 if (msg_ts_off > 2 * ftRRBseqTimeout)
1057 goto defer;
1058 }
1059
1060 msg_seq = le_to_host32(msg_both->seq);
1061 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
1062 msg_off = msg_seq - rkh_off;
1063 if (msg_off > 0xC0000000)
1064 goto out; /* too old message, drop it */
1065
1066 if (msg_off <= 0x40000000) {
1067 for (i = 0; i < rkh_seq->rx.num_last; i++) {
1068 if (rkh_seq->rx.last[i] == msg_seq)
1069 goto out; /* duplicate message, drop it */
1070 }
1071
1072 return FT_RRB_SEQ_OK;
1073 }
1074
1075 defer:
1076 if (no_defer)
1077 goto out;
1078
1079 wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
1080 MACSTR, msgtype, MAC2STR(src_addr));
1081
1082 return FT_RRB_SEQ_DEFER;
1083 out:
1084 wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
1085 msgtype, MAC2STR(src_addr));
1086
1087 return FT_RRB_SEQ_DROP;
1088 }
1089
1090
1091 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)1092 wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
1093 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
1094 const u8 *auth, size_t auth_len,
1095 const char *msgtype)
1096 {
1097 const u8 *f_seq;
1098 size_t f_seq_len;
1099 const struct ft_rrb_seq *msg_both;
1100 u32 msg_seq, msg_off, min_off, rkh_off;
1101 int minidx = 0;
1102 unsigned int i;
1103
1104 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
1105 msg_both = (const struct ft_rrb_seq *) f_seq;
1106
1107 msg_seq = le_to_host32(msg_both->seq);
1108
1109 if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
1110 rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
1111 rkh_seq->rx.num_last++;
1112 return;
1113 }
1114
1115 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
1116 for (i = 0; i < rkh_seq->rx.num_last; i++) {
1117 msg_off = rkh_seq->rx.last[i] - rkh_off;
1118 min_off = rkh_seq->rx.last[minidx] - rkh_off;
1119 if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
1120 minidx = i;
1121 }
1122 rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
1123 rkh_seq->rx.offsetidx = minidx;
1124
1125 return;
1126 out:
1127 /* RRB_GET_AUTH should never fail here as
1128 * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
1129 wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
1130 }
1131
1132
wpa_ft_new_seq(struct ft_remote_seq * rkh_seq,struct ft_rrb_seq * f_seq)1133 static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
1134 struct ft_rrb_seq *f_seq)
1135 {
1136 struct os_reltime now;
1137
1138 if (os_get_reltime(&now) < 0)
1139 return -1;
1140
1141 if (!rkh_seq->tx.dom) {
1142 if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
1143 sizeof(rkh_seq->tx.seq))) {
1144 wpa_printf(MSG_ERROR,
1145 "FT: Failed to get random data for sequence number initialization");
1146 rkh_seq->tx.seq = now.usec;
1147 }
1148 if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
1149 sizeof(rkh_seq->tx.dom))) {
1150 wpa_printf(MSG_ERROR,
1151 "FT: Failed to get random data for sequence number initialization");
1152 rkh_seq->tx.dom = now.usec;
1153 }
1154 rkh_seq->tx.dom |= 1;
1155 }
1156
1157 f_seq->dom = host_to_le32(rkh_seq->tx.dom);
1158 f_seq->seq = host_to_le32(rkh_seq->tx.seq);
1159 f_seq->ts = host_to_le32(now.sec);
1160
1161 rkh_seq->tx.seq++;
1162
1163 return 0;
1164 }
1165
1166
1167 struct wpa_ft_pmk_r0_sa {
1168 struct dl_list list;
1169 u8 pmk_r0[PMK_LEN_MAX];
1170 size_t pmk_r0_len;
1171 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
1172 u8 spa[ETH_ALEN];
1173 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
1174 struct vlan_description *vlan;
1175 os_time_t expiration; /* 0 for no expiration */
1176 u8 *identity;
1177 size_t identity_len;
1178 u8 *radius_cui;
1179 size_t radius_cui_len;
1180 os_time_t session_timeout; /* 0 for no expiration */
1181 /* TODO: radius_class, EAP type */
1182 int pmk_r1_pushed;
1183 };
1184
1185 struct wpa_ft_pmk_r1_sa {
1186 struct dl_list list;
1187 u8 pmk_r1[PMK_LEN_MAX];
1188 size_t pmk_r1_len;
1189 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
1190 u8 spa[ETH_ALEN];
1191 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
1192 struct vlan_description *vlan;
1193 u8 *identity;
1194 size_t identity_len;
1195 u8 *radius_cui;
1196 size_t radius_cui_len;
1197 os_time_t session_timeout; /* 0 for no expiration */
1198 /* TODO: radius_class, EAP type */
1199 };
1200
1201 struct wpa_ft_pmk_cache {
1202 struct dl_list pmk_r0; /* struct wpa_ft_pmk_r0_sa */
1203 struct dl_list pmk_r1; /* struct wpa_ft_pmk_r1_sa */
1204 };
1205
1206
1207 static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx);
1208 static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx);
1209
1210
wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa * r0)1211 static void wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa *r0)
1212 {
1213 if (!r0)
1214 return;
1215
1216 dl_list_del(&r0->list);
1217 eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
1218
1219 os_memset(r0->pmk_r0, 0, PMK_LEN_MAX);
1220 os_free(r0->vlan);
1221 os_free(r0->identity);
1222 os_free(r0->radius_cui);
1223 os_free(r0);
1224 }
1225
1226
wpa_ft_expire_pmk_r0(void * eloop_ctx,void * timeout_ctx)1227 static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx)
1228 {
1229 struct wpa_ft_pmk_r0_sa *r0 = eloop_ctx;
1230 struct os_reltime now;
1231 int expires_in;
1232 int session_timeout;
1233
1234 os_get_reltime(&now);
1235
1236 if (!r0)
1237 return;
1238
1239 expires_in = r0->expiration - now.sec;
1240 session_timeout = r0->session_timeout - now.sec;
1241 /* conditions to remove from cache:
1242 * a) r0->expiration is set and hit
1243 * -or-
1244 * b) r0->session_timeout is set and hit
1245 */
1246 if ((!r0->expiration || expires_in > 0) &&
1247 (!r0->session_timeout || session_timeout > 0)) {
1248 wpa_printf(MSG_ERROR,
1249 "FT: %s() called for non-expired entry %p",
1250 __func__, r0);
1251 eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
1252 if (r0->expiration && expires_in > 0)
1253 eloop_register_timeout(expires_in + 1, 0,
1254 wpa_ft_expire_pmk_r0, r0, NULL);
1255 if (r0->session_timeout && session_timeout > 0)
1256 eloop_register_timeout(session_timeout + 1, 0,
1257 wpa_ft_expire_pmk_r0, r0, NULL);
1258 return;
1259 }
1260
1261 wpa_ft_free_pmk_r0(r0);
1262 }
1263
1264
wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa * r1)1265 static void wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa *r1)
1266 {
1267 if (!r1)
1268 return;
1269
1270 dl_list_del(&r1->list);
1271 eloop_cancel_timeout(wpa_ft_expire_pmk_r1, r1, NULL);
1272
1273 os_memset(r1->pmk_r1, 0, PMK_LEN_MAX);
1274 os_free(r1->vlan);
1275 os_free(r1->identity);
1276 os_free(r1->radius_cui);
1277 os_free(r1);
1278 }
1279
1280
wpa_ft_expire_pmk_r1(void * eloop_ctx,void * timeout_ctx)1281 static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx)
1282 {
1283 struct wpa_ft_pmk_r1_sa *r1 = eloop_ctx;
1284
1285 wpa_ft_free_pmk_r1(r1);
1286 }
1287
1288
wpa_ft_pmk_cache_init(void)1289 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
1290 {
1291 struct wpa_ft_pmk_cache *cache;
1292
1293 cache = os_zalloc(sizeof(*cache));
1294 if (cache) {
1295 dl_list_init(&cache->pmk_r0);
1296 dl_list_init(&cache->pmk_r1);
1297 }
1298
1299 return cache;
1300 }
1301
1302
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)1303 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
1304 {
1305 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
1306 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
1307
1308 dl_list_for_each_safe(r0, r0prev, &cache->pmk_r0,
1309 struct wpa_ft_pmk_r0_sa, list)
1310 wpa_ft_free_pmk_r0(r0);
1311
1312 dl_list_for_each_safe(r1, r1prev, &cache->pmk_r1,
1313 struct wpa_ft_pmk_r1_sa, list)
1314 wpa_ft_free_pmk_r1(r1);
1315
1316 os_free(cache);
1317 }
1318
1319
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)1320 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
1321 const u8 *spa, const u8 *pmk_r0,
1322 size_t pmk_r0_len,
1323 const u8 *pmk_r0_name, int pairwise,
1324 const struct vlan_description *vlan,
1325 int expires_in, int session_timeout,
1326 const u8 *identity, size_t identity_len,
1327 const u8 *radius_cui, size_t radius_cui_len)
1328 {
1329 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1330 struct wpa_ft_pmk_r0_sa *r0;
1331 struct os_reltime now;
1332
1333 /* TODO: add limit on number of entries in cache */
1334 os_get_reltime(&now);
1335
1336 r0 = os_zalloc(sizeof(*r0));
1337 if (r0 == NULL)
1338 return -1;
1339
1340 os_memcpy(r0->pmk_r0, pmk_r0, pmk_r0_len);
1341 r0->pmk_r0_len = pmk_r0_len;
1342 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
1343 os_memcpy(r0->spa, spa, ETH_ALEN);
1344 r0->pairwise = pairwise;
1345 if (expires_in > 0)
1346 r0->expiration = now.sec + expires_in;
1347 if (vlan && vlan->notempty) {
1348 r0->vlan = os_zalloc(sizeof(*vlan));
1349 if (!r0->vlan) {
1350 bin_clear_free(r0, sizeof(*r0));
1351 return -1;
1352 }
1353 *r0->vlan = *vlan;
1354 }
1355 if (identity) {
1356 r0->identity = os_malloc(identity_len);
1357 if (r0->identity) {
1358 os_memcpy(r0->identity, identity, identity_len);
1359 r0->identity_len = identity_len;
1360 }
1361 }
1362 if (radius_cui) {
1363 r0->radius_cui = os_malloc(radius_cui_len);
1364 if (r0->radius_cui) {
1365 os_memcpy(r0->radius_cui, radius_cui, radius_cui_len);
1366 r0->radius_cui_len = radius_cui_len;
1367 }
1368 }
1369 if (session_timeout > 0)
1370 r0->session_timeout = now.sec + session_timeout;
1371
1372 dl_list_add(&cache->pmk_r0, &r0->list);
1373 if (expires_in > 0)
1374 eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0,
1375 r0, NULL);
1376 if (session_timeout > 0)
1377 eloop_register_timeout(session_timeout + 1, 0,
1378 wpa_ft_expire_pmk_r0, r0, NULL);
1379
1380 return 0;
1381 }
1382
1383
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)1384 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
1385 const u8 *spa, const u8 *pmk_r0_name,
1386 const struct wpa_ft_pmk_r0_sa **r0_out)
1387 {
1388 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1389 struct wpa_ft_pmk_r0_sa *r0;
1390 struct os_reltime now;
1391
1392 os_get_reltime(&now);
1393 dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
1394 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
1395 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
1396 WPA_PMK_NAME_LEN) == 0) {
1397 *r0_out = r0;
1398 return 0;
1399 }
1400 }
1401
1402 *r0_out = NULL;
1403 return -1;
1404 }
1405
1406
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)1407 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
1408 const u8 *spa, const u8 *pmk_r1,
1409 size_t pmk_r1_len,
1410 const u8 *pmk_r1_name, int pairwise,
1411 const struct vlan_description *vlan,
1412 int expires_in, int session_timeout,
1413 const u8 *identity, size_t identity_len,
1414 const u8 *radius_cui, size_t radius_cui_len)
1415 {
1416 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1417 int max_expires_in = wpa_auth->conf.r1_max_key_lifetime;
1418 struct wpa_ft_pmk_r1_sa *r1;
1419 struct os_reltime now;
1420
1421 /* TODO: limit on number of entries in cache */
1422 os_get_reltime(&now);
1423
1424 if (max_expires_in && (max_expires_in < expires_in || expires_in == 0))
1425 expires_in = max_expires_in;
1426
1427 r1 = os_zalloc(sizeof(*r1));
1428 if (r1 == NULL)
1429 return -1;
1430
1431 os_memcpy(r1->pmk_r1, pmk_r1, pmk_r1_len);
1432 r1->pmk_r1_len = pmk_r1_len;
1433 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
1434 os_memcpy(r1->spa, spa, ETH_ALEN);
1435 r1->pairwise = pairwise;
1436 if (vlan && vlan->notempty) {
1437 r1->vlan = os_zalloc(sizeof(*vlan));
1438 if (!r1->vlan) {
1439 bin_clear_free(r1, sizeof(*r1));
1440 return -1;
1441 }
1442 *r1->vlan = *vlan;
1443 }
1444 if (identity) {
1445 r1->identity = os_malloc(identity_len);
1446 if (r1->identity) {
1447 os_memcpy(r1->identity, identity, identity_len);
1448 r1->identity_len = identity_len;
1449 }
1450 }
1451 if (radius_cui) {
1452 r1->radius_cui = os_malloc(radius_cui_len);
1453 if (r1->radius_cui) {
1454 os_memcpy(r1->radius_cui, radius_cui, radius_cui_len);
1455 r1->radius_cui_len = radius_cui_len;
1456 }
1457 }
1458 if (session_timeout > 0)
1459 r1->session_timeout = now.sec + session_timeout;
1460
1461 dl_list_add(&cache->pmk_r1, &r1->list);
1462
1463 if (expires_in > 0)
1464 eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r1,
1465 r1, NULL);
1466 if (session_timeout > 0)
1467 eloop_register_timeout(session_timeout + 1, 0,
1468 wpa_ft_expire_pmk_r1, r1, NULL);
1469
1470 return 0;
1471 }
1472
1473
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)1474 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
1475 const u8 *spa, const u8 *pmk_r1_name,
1476 u8 *pmk_r1, size_t *pmk_r1_len, int *pairwise,
1477 struct vlan_description *vlan,
1478 const u8 **identity, size_t *identity_len,
1479 const u8 **radius_cui, size_t *radius_cui_len,
1480 int *session_timeout)
1481 {
1482 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
1483 struct wpa_ft_pmk_r1_sa *r1;
1484 struct os_reltime now;
1485
1486 os_get_reltime(&now);
1487
1488 dl_list_for_each(r1, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) {
1489 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
1490 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
1491 WPA_PMK_NAME_LEN) == 0) {
1492 os_memcpy(pmk_r1, r1->pmk_r1, r1->pmk_r1_len);
1493 *pmk_r1_len = r1->pmk_r1_len;
1494 if (pairwise)
1495 *pairwise = r1->pairwise;
1496 if (vlan && r1->vlan)
1497 *vlan = *r1->vlan;
1498 if (vlan && !r1->vlan)
1499 os_memset(vlan, 0, sizeof(*vlan));
1500 if (identity && identity_len) {
1501 *identity = r1->identity;
1502 *identity_len = r1->identity_len;
1503 }
1504 if (radius_cui && radius_cui_len) {
1505 *radius_cui = r1->radius_cui;
1506 *radius_cui_len = r1->radius_cui_len;
1507 }
1508 if (session_timeout && r1->session_timeout > now.sec)
1509 *session_timeout = r1->session_timeout -
1510 now.sec;
1511 else if (session_timeout && r1->session_timeout)
1512 *session_timeout = 1;
1513 else if (session_timeout)
1514 *session_timeout = 0;
1515 return 0;
1516 }
1517 }
1518
1519 return -1;
1520 }
1521
1522
wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh * r0kh)1523 static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
1524 {
1525 if (r0kh->seq)
1526 return 0;
1527
1528 r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
1529 if (!r0kh->seq) {
1530 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
1531 return -1;
1532 }
1533
1534 dl_list_init(&r0kh->seq->rx.queue);
1535
1536 return 0;
1537 }
1538
1539
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)1540 static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
1541 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
1542 struct ft_remote_r0kh **r0kh_out,
1543 struct ft_remote_r0kh **r0kh_wildcard)
1544 {
1545 struct ft_remote_r0kh *r0kh;
1546
1547 *r0kh_wildcard = NULL;
1548 *r0kh_out = NULL;
1549
1550 if (wpa_auth->conf.r0kh_list)
1551 r0kh = *wpa_auth->conf.r0kh_list;
1552 else
1553 r0kh = NULL;
1554 for (; r0kh; r0kh = r0kh->next) {
1555 if (r0kh->id_len == 1 && r0kh->id[0] == '*')
1556 *r0kh_wildcard = r0kh;
1557 if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
1558 os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
1559 *r0kh_out = r0kh;
1560 }
1561
1562 if (!*r0kh_out && !*r0kh_wildcard)
1563 wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");
1564
1565 if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
1566 *r0kh_out = NULL;
1567 }
1568
1569
wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh * r1kh)1570 static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
1571 {
1572 if (r1kh->seq)
1573 return 0;
1574
1575 r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
1576 if (!r1kh->seq) {
1577 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
1578 return -1;
1579 }
1580
1581 dl_list_init(&r1kh->seq->rx.queue);
1582
1583 return 0;
1584 }
1585
1586
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)1587 static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
1588 const u8 *f_r1kh_id,
1589 struct ft_remote_r1kh **r1kh_out,
1590 struct ft_remote_r1kh **r1kh_wildcard)
1591 {
1592 struct ft_remote_r1kh *r1kh;
1593
1594 *r1kh_wildcard = NULL;
1595 *r1kh_out = NULL;
1596
1597 if (wpa_auth->conf.r1kh_list)
1598 r1kh = *wpa_auth->conf.r1kh_list;
1599 else
1600 r1kh = NULL;
1601 for (; r1kh; r1kh = r1kh->next) {
1602 if (is_zero_ether_addr(r1kh->addr) &&
1603 is_zero_ether_addr(r1kh->id))
1604 *r1kh_wildcard = r1kh;
1605 if (f_r1kh_id &&
1606 os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
1607 *r1kh_out = r1kh;
1608 }
1609
1610 if (!*r1kh_out && !*r1kh_wildcard)
1611 wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");
1612
1613 if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
1614 *r1kh_out = NULL;
1615 }
1616
1617
wpa_ft_rrb_check_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len)1618 static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
1619 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1620 {
1621 if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
1622 os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
1623 f_r0kh_id_len) != 0)
1624 return -1;
1625
1626 return 0;
1627 }
1628
1629
wpa_ft_rrb_check_r1kh(struct wpa_authenticator * wpa_auth,const u8 * f_r1kh_id)1630 static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
1631 const u8 *f_r1kh_id)
1632 {
1633 if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
1634 FT_R1KH_ID_LEN) != 0)
1635 return -1;
1636
1637 return 0;
1638 }
1639
1640
wpa_ft_rrb_del_r0kh(void * eloop_ctx,void * timeout_ctx)1641 static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
1642 {
1643 struct wpa_authenticator *wpa_auth = eloop_ctx;
1644 struct ft_remote_r0kh *r0kh, *prev = NULL;
1645
1646 if (!wpa_auth->conf.r0kh_list)
1647 return;
1648
1649 for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
1650 if (r0kh == timeout_ctx)
1651 break;
1652 prev = r0kh;
1653 }
1654 if (!r0kh)
1655 return;
1656 if (prev)
1657 prev->next = r0kh->next;
1658 else
1659 *wpa_auth->conf.r0kh_list = r0kh->next;
1660 if (r0kh->seq)
1661 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1662 os_free(r0kh->seq);
1663 os_free(r0kh);
1664 }
1665
1666
wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh,int timeout)1667 static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
1668 struct ft_remote_r0kh *r0kh, int timeout)
1669 {
1670 if (timeout > 0)
1671 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1672 wpa_auth, r0kh);
1673 }
1674
1675
wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh,int timeout)1676 static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
1677 struct ft_remote_r0kh *r0kh, int timeout)
1678 {
1679 eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);
1680
1681 if (timeout > 0)
1682 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1683 wpa_auth, r0kh);
1684 }
1685
1686
1687 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)1688 wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
1689 struct ft_remote_r0kh *r0kh_wildcard,
1690 const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
1691 int timeout)
1692 {
1693 struct ft_remote_r0kh *r0kh;
1694
1695 if (!wpa_auth->conf.r0kh_list)
1696 return NULL;
1697
1698 r0kh = os_zalloc(sizeof(*r0kh));
1699 if (!r0kh)
1700 return NULL;
1701
1702 if (src_addr)
1703 os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));
1704
1705 if (id_len > FT_R0KH_ID_MAX_LEN)
1706 id_len = FT_R0KH_ID_MAX_LEN;
1707 os_memcpy(r0kh->id, r0kh_id, id_len);
1708 r0kh->id_len = id_len;
1709
1710 os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));
1711
1712 r0kh->next = *wpa_auth->conf.r0kh_list;
1713 *wpa_auth->conf.r0kh_list = r0kh;
1714
1715 if (timeout > 0)
1716 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1717 wpa_auth, r0kh);
1718
1719 if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
1720 return NULL;
1721
1722 return r0kh;
1723 }
1724
1725
wpa_ft_rrb_del_r1kh(void * eloop_ctx,void * timeout_ctx)1726 static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
1727 {
1728 struct wpa_authenticator *wpa_auth = eloop_ctx;
1729 struct ft_remote_r1kh *r1kh, *prev = NULL;
1730
1731 if (!wpa_auth->conf.r1kh_list)
1732 return;
1733
1734 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
1735 if (r1kh == timeout_ctx)
1736 break;
1737 prev = r1kh;
1738 }
1739 if (!r1kh)
1740 return;
1741 if (prev)
1742 prev->next = r1kh->next;
1743 else
1744 *wpa_auth->conf.r1kh_list = r1kh->next;
1745 if (r1kh->seq)
1746 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1747 os_free(r1kh->seq);
1748 os_free(r1kh);
1749 }
1750
1751
wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator * wpa_auth,struct ft_remote_r1kh * r1kh,int timeout)1752 static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
1753 struct ft_remote_r1kh *r1kh, int timeout)
1754 {
1755 if (timeout > 0)
1756 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1757 wpa_auth, r1kh);
1758 }
1759
1760
1761 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)1762 wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
1763 struct ft_remote_r1kh *r1kh_wildcard,
1764 const u8 *src_addr, const u8 *r1kh_id, int timeout)
1765 {
1766 struct ft_remote_r1kh *r1kh;
1767
1768 if (!wpa_auth->conf.r1kh_list)
1769 return NULL;
1770
1771 r1kh = os_zalloc(sizeof(*r1kh));
1772 if (!r1kh)
1773 return NULL;
1774
1775 os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
1776 os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
1777 os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
1778 r1kh->next = *wpa_auth->conf.r1kh_list;
1779 *wpa_auth->conf.r1kh_list = r1kh;
1780
1781 if (timeout > 0)
1782 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1783 wpa_auth, r1kh);
1784
1785 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
1786 return NULL;
1787
1788 return r1kh;
1789 }
1790
1791
wpa_ft_sta_deinit(struct wpa_state_machine * sm)1792 void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
1793 {
1794 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1795 }
1796
1797
wpa_ft_deinit_seq(struct wpa_authenticator * wpa_auth)1798 static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
1799 {
1800 struct ft_remote_r0kh *r0kh;
1801 struct ft_remote_r1kh *r1kh;
1802
1803 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);
1804
1805 if (wpa_auth->conf.r0kh_list)
1806 r0kh = *wpa_auth->conf.r0kh_list;
1807 else
1808 r0kh = NULL;
1809 for (; r0kh; r0kh = r0kh->next) {
1810 if (!r0kh->seq)
1811 continue;
1812 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1813 os_free(r0kh->seq);
1814 r0kh->seq = NULL;
1815 }
1816
1817 if (wpa_auth->conf.r1kh_list)
1818 r1kh = *wpa_auth->conf.r1kh_list;
1819 else
1820 r1kh = NULL;
1821 for (; r1kh; r1kh = r1kh->next) {
1822 if (!r1kh->seq)
1823 continue;
1824 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1825 os_free(r1kh->seq);
1826 r1kh->seq = NULL;
1827 }
1828 }
1829
1830
wpa_ft_deinit_rkh_tmp(struct wpa_authenticator * wpa_auth)1831 static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
1832 {
1833 struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
1834 struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;
1835
1836 if (wpa_auth->conf.r0kh_list)
1837 r0kh = *wpa_auth->conf.r0kh_list;
1838 else
1839 r0kh = NULL;
1840 while (r0kh) {
1841 r0kh_next = r0kh->next;
1842 if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
1843 r0kh) > 0) {
1844 if (r0kh_prev)
1845 r0kh_prev->next = r0kh_next;
1846 else
1847 *wpa_auth->conf.r0kh_list = r0kh_next;
1848 os_free(r0kh);
1849 } else {
1850 r0kh_prev = r0kh;
1851 }
1852 r0kh = r0kh_next;
1853 }
1854
1855 if (wpa_auth->conf.r1kh_list)
1856 r1kh = *wpa_auth->conf.r1kh_list;
1857 else
1858 r1kh = NULL;
1859 while (r1kh) {
1860 r1kh_next = r1kh->next;
1861 if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
1862 r1kh) > 0) {
1863 if (r1kh_prev)
1864 r1kh_prev->next = r1kh_next;
1865 else
1866 *wpa_auth->conf.r1kh_list = r1kh_next;
1867 os_free(r1kh);
1868 } else {
1869 r1kh_prev = r1kh;
1870 }
1871 r1kh = r1kh_next;
1872 }
1873 }
1874
1875
wpa_ft_deinit(struct wpa_authenticator * wpa_auth)1876 void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
1877 {
1878 wpa_ft_deinit_seq(wpa_auth);
1879 wpa_ft_deinit_rkh_tmp(wpa_auth);
1880 }
1881
1882
wpa_ft_block_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len)1883 static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
1884 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1885 {
1886 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1887
1888 if (!wpa_auth->conf.rkh_neg_timeout)
1889 return;
1890
1891 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
1892 &r0kh, &r0kh_wildcard);
1893
1894 if (!r0kh_wildcard) {
1895 /* r0kh removed after neg_timeout and might need re-adding */
1896 return;
1897 }
1898
1899 wpa_hexdump(MSG_DEBUG, "FT: Blacklist R0KH-ID",
1900 f_r0kh_id, f_r0kh_id_len);
1901
1902 if (r0kh) {
1903 wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
1904 wpa_auth->conf.rkh_neg_timeout);
1905 os_memset(r0kh->addr, 0, ETH_ALEN);
1906 } else
1907 wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
1908 f_r0kh_id_len,
1909 wpa_auth->conf.rkh_neg_timeout);
1910 }
1911
1912
wpa_ft_expire_pull(void * eloop_ctx,void * timeout_ctx)1913 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
1914 {
1915 struct wpa_state_machine *sm = eloop_ctx;
1916
1917 wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
1918 MAC2STR(sm->addr));
1919 if (sm->ft_pending_pull_left_retries <= 0)
1920 wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);
1921
1922 /* cancel multiple timeouts */
1923 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1924 ft_finish_pull(sm);
1925 }
1926
1927
wpa_ft_pull_pmk_r1(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * pmk_r0_name)1928 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
1929 const u8 *ies, size_t ies_len,
1930 const u8 *pmk_r0_name)
1931 {
1932 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1933 u8 *packet = NULL;
1934 const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
1935 size_t packet_len, key_len;
1936 struct ft_rrb_seq f_seq;
1937 int tsecs, tusecs, first;
1938 struct wpabuf *ft_pending_req_ies;
1939 int r0kh_timeout;
1940 struct tlv_list req_enc[] = {
1941 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
1942 .data = pmk_r0_name },
1943 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
1944 .data = sm->addr },
1945 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1946 };
1947 struct tlv_list req_auth[] = {
1948 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
1949 .data = sm->ft_pending_pull_nonce },
1950 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
1951 .data = (u8 *) &f_seq },
1952 { .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
1953 .data = sm->r0kh_id },
1954 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
1955 .data = f_r1kh_id },
1956 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1957 };
1958
1959 if (sm->ft_pending_pull_left_retries <= 0)
1960 return -1;
1961 first = sm->ft_pending_pull_left_retries ==
1962 sm->wpa_auth->conf.rkh_pull_retries;
1963 sm->ft_pending_pull_left_retries--;
1964
1965 wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
1966 &r0kh, &r0kh_wildcard);
1967
1968 /* Keep r0kh sufficiently long in the list for seq num check */
1969 r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
1970 1 + ftRRBseqTimeout;
1971 if (r0kh) {
1972 wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
1973 } else if (r0kh_wildcard) {
1974 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
1975 /* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
1976 r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
1977 r0kh_wildcard->addr,
1978 sm->r0kh_id, sm->r0kh_id_len,
1979 r0kh_timeout);
1980 }
1981 if (r0kh == NULL) {
1982 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
1983 sm->r0kh_id, sm->r0kh_id_len);
1984 return -1;
1985 }
1986 if (is_zero_ether_addr(r0kh->addr)) {
1987 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is blacklisted",
1988 sm->r0kh_id, sm->r0kh_id_len);
1989 return -1;
1990 }
1991 if (os_memcmp(r0kh->addr, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1992 wpa_printf(MSG_DEBUG,
1993 "FT: R0KH-ID points to self - no matching key available");
1994 return -1;
1995 }
1996
1997 key = r0kh->key;
1998 key_len = sizeof(r0kh->key);
1999
2000 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
2001 "address " MACSTR, MAC2STR(r0kh->addr));
2002
2003 if (r0kh->seq->rx.num_last == 0) {
2004 /* A sequence request will be sent out anyway when pull
2005 * response is received. Send it out now to avoid one RTT. */
2006 wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
2007 r0kh->id, r0kh->id_len, f_r1kh_id, key,
2008 key_len, NULL, 0, NULL, 0, NULL);
2009 }
2010
2011 if (first &&
2012 random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
2013 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
2014 "nonce");
2015 return -1;
2016 }
2017
2018 if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
2019 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
2020 return -1;
2021 }
2022
2023 if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth, NULL,
2024 sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
2025 &packet, &packet_len) < 0)
2026 return -1;
2027
2028 ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
2029 wpabuf_free(sm->ft_pending_req_ies);
2030 sm->ft_pending_req_ies = ft_pending_req_ies;
2031 if (!sm->ft_pending_req_ies) {
2032 os_free(packet);
2033 return -1;
2034 }
2035
2036 tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
2037 tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
2038 eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);
2039
2040 wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
2041 packet, packet_len);
2042
2043 os_free(packet);
2044
2045 return 0;
2046 }
2047
2048
wpa_ft_store_pmk_fils(struct wpa_state_machine * sm,const u8 * pmk_r0,const u8 * pmk_r0_name)2049 int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
2050 const u8 *pmk_r0, const u8 *pmk_r0_name)
2051 {
2052 int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
2053 struct vlan_description vlan;
2054 const u8 *identity, *radius_cui;
2055 size_t identity_len, radius_cui_len;
2056 int session_timeout;
2057 size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
2058 SHA384_MAC_LEN : PMK_LEN;
2059
2060 if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2061 wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
2062 MAC2STR(sm->addr));
2063 return -1;
2064 }
2065
2066 identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
2067 radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
2068 &radius_cui);
2069 session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
2070
2071 return wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
2072 pmk_r0_name, sm->pairwise, &vlan, expires_in,
2073 session_timeout, identity, identity_len,
2074 radius_cui, radius_cui_len);
2075 }
2076
2077
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,struct wpa_ptk * ptk)2078 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, struct wpa_ptk *ptk)
2079 {
2080 u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
2081 size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
2082 SHA384_MAC_LEN : PMK_LEN;
2083 size_t pmk_r1_len = pmk_r0_len;
2084 u8 pmk_r1[PMK_LEN_MAX];
2085 u8 ptk_name[WPA_PMK_NAME_LEN];
2086 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
2087 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
2088 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
2089 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
2090 const u8 *ssid = sm->wpa_auth->conf.ssid;
2091 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
2092 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
2093 int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
2094 struct vlan_description vlan;
2095 const u8 *identity, *radius_cui;
2096 size_t identity_len, radius_cui_len;
2097 int session_timeout;
2098 const u8 *mpmk;
2099 size_t mpmk_len;
2100
2101 if (sm->xxkey_len > 0) {
2102 mpmk = sm->xxkey;
2103 mpmk_len = sm->xxkey_len;
2104 } else if (sm->pmksa) {
2105 mpmk = sm->pmksa->pmk;
2106 mpmk_len = sm->pmksa->pmk_len;
2107 } else {
2108 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
2109 "derivation");
2110 return -1;
2111 }
2112
2113 if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
2114 wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
2115 MAC2STR(sm->addr));
2116 return -1;
2117 }
2118
2119 identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
2120 radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
2121 &radius_cui);
2122 session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
2123
2124 if (wpa_derive_pmk_r0(mpmk, mpmk_len, ssid, ssid_len, mdid,
2125 r0kh, r0kh_len, sm->addr,
2126 pmk_r0, pmk_r0_name,
2127 wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) < 0)
2128 return -1;
2129 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, pmk_r0_len);
2130 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
2131 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
2132 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
2133 pmk_r0_name,
2134 sm->pairwise, &vlan, expires_in,
2135 session_timeout, identity, identity_len,
2136 radius_cui, radius_cui_len);
2137
2138 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_len, pmk_r0_name, r1kh, sm->addr,
2139 pmk_r1, sm->pmk_r1_name) < 0)
2140 return -1;
2141 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, pmk_r1_len);
2142 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
2143 WPA_PMK_NAME_LEN);
2144 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
2145 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_len,
2146 sm->pmk_r1_name, sm->pairwise, &vlan,
2147 expires_in, session_timeout, identity,
2148 identity_len, radius_cui, radius_cui_len);
2149
2150 return wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
2151 sm->addr, sm->wpa_auth->addr, sm->pmk_r1_name,
2152 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
2153 }
2154
2155
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)2156 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
2157 const u8 *addr, int idx, u8 *seq)
2158 {
2159 if (wpa_auth->cb->get_seqnum == NULL)
2160 return -1;
2161 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
2162 }
2163
2164
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)2165 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
2166 {
2167 u8 *subelem;
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[32];
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 os_memset(keybuf + key_len, 0, pad_len);
2200 keybuf[key_len] = 0xdd;
2201 key_len += pad_len;
2202 key = keybuf;
2203 } else
2204 key = gsm->GTK[gsm->GN - 1];
2205
2206 /*
2207 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2208 * Key[5..32].
2209 */
2210 subelem_len = 13 + key_len + 8;
2211 subelem = os_zalloc(subelem_len);
2212 if (subelem == NULL)
2213 return NULL;
2214
2215 subelem[0] = FTIE_SUBELEM_GTK;
2216 subelem[1] = 11 + key_len + 8;
2217 /* Key ID in B0-B1 of Key Info */
2218 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
2219 subelem[4] = gsm->GTK_len;
2220 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
2221 if (aes_wrap(kek, kek_len, key_len / 8, key, subelem + 13)) {
2222 wpa_printf(MSG_DEBUG,
2223 "FT: GTK subelem encryption failed: kek_len=%d",
2224 (int) kek_len);
2225 os_free(subelem);
2226 return NULL;
2227 }
2228
2229 forced_memzero(keybuf, sizeof(keybuf));
2230 *len = subelem_len;
2231 return subelem;
2232 }
2233
2234
2235 #ifdef CONFIG_IEEE80211W
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)2236 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
2237 {
2238 u8 *subelem, *pos;
2239 struct wpa_group *gsm = sm->group;
2240 size_t subelem_len;
2241 const u8 *kek;
2242 size_t kek_len;
2243 size_t igtk_len;
2244
2245 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2246 kek = sm->PTK.kek2;
2247 kek_len = sm->PTK.kek2_len;
2248 } else {
2249 kek = sm->PTK.kek;
2250 kek_len = sm->PTK.kek_len;
2251 }
2252
2253 igtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2254
2255 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
2256 * Key[16+8] */
2257 subelem_len = 1 + 1 + 2 + 6 + 1 + igtk_len + 8;
2258 subelem = os_zalloc(subelem_len);
2259 if (subelem == NULL)
2260 return NULL;
2261
2262 pos = subelem;
2263 *pos++ = FTIE_SUBELEM_IGTK;
2264 *pos++ = subelem_len - 2;
2265 WPA_PUT_LE16(pos, gsm->GN_igtk);
2266 pos += 2;
2267 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
2268 pos += 6;
2269 *pos++ = igtk_len;
2270 if (aes_wrap(kek, kek_len, igtk_len / 8,
2271 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
2272 wpa_printf(MSG_DEBUG,
2273 "FT: IGTK subelem encryption failed: kek_len=%d",
2274 (int) kek_len);
2275 os_free(subelem);
2276 return NULL;
2277 }
2278
2279 *len = subelem_len;
2280 return subelem;
2281 }
2282 #endif /* CONFIG_IEEE80211W */
2283
2284
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)2285 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
2286 u8 *pos, u8 *end, u8 id, u8 descr_count,
2287 const u8 *ies, size_t ies_len)
2288 {
2289 struct ieee802_11_elems parse;
2290 struct rsn_rdie *rdie;
2291
2292 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
2293 id, descr_count);
2294 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
2295 ies, ies_len);
2296
2297 if (end - pos < (int) sizeof(*rdie)) {
2298 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
2299 return pos;
2300 }
2301
2302 *pos++ = WLAN_EID_RIC_DATA;
2303 *pos++ = sizeof(*rdie);
2304 rdie = (struct rsn_rdie *) pos;
2305 rdie->id = id;
2306 rdie->descr_count = 0;
2307 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
2308 pos += sizeof(*rdie);
2309
2310 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
2311 ParseFailed) {
2312 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
2313 rdie->status_code =
2314 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2315 return pos;
2316 }
2317
2318 if (parse.wmm_tspec) {
2319 struct wmm_tspec_element *tspec;
2320
2321 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
2322 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
2323 "(%d)", (int) parse.wmm_tspec_len);
2324 rdie->status_code =
2325 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2326 return pos;
2327 }
2328 if (end - pos < (int) sizeof(*tspec)) {
2329 wpa_printf(MSG_ERROR, "FT: Not enough room for "
2330 "response TSPEC");
2331 rdie->status_code =
2332 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2333 return pos;
2334 }
2335 tspec = (struct wmm_tspec_element *) pos;
2336 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
2337 }
2338
2339 #ifdef NEED_AP_MLME
2340 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
2341 int res;
2342
2343 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
2344 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
2345 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
2346 rdie->status_code =
2347 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
2348 else if (res == WMM_ADDTS_STATUS_REFUSED)
2349 rdie->status_code =
2350 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
2351 else {
2352 /* TSPEC accepted; include updated TSPEC in response */
2353 rdie->descr_count = 1;
2354 pos += sizeof(struct wmm_tspec_element);
2355 }
2356 return pos;
2357 }
2358 #endif /* NEED_AP_MLME */
2359
2360 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
2361 int res;
2362
2363 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
2364 sizeof(struct wmm_tspec_element));
2365 if (res >= 0) {
2366 if (res)
2367 rdie->status_code = host_to_le16(res);
2368 else {
2369 /* TSPEC accepted; include updated TSPEC in
2370 * response */
2371 rdie->descr_count = 1;
2372 pos += sizeof(struct wmm_tspec_element);
2373 }
2374 return pos;
2375 }
2376 }
2377
2378 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
2379 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
2380 return pos;
2381 }
2382
2383
wpa_ft_process_ric(struct wpa_state_machine * sm,u8 * pos,u8 * end,const u8 * ric,size_t ric_len)2384 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
2385 const u8 *ric, size_t ric_len)
2386 {
2387 const u8 *rpos, *start;
2388 const struct rsn_rdie *rdie;
2389
2390 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
2391
2392 rpos = ric;
2393 while (rpos + sizeof(*rdie) < ric + ric_len) {
2394 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
2395 rpos + 2 + rpos[1] > ric + ric_len)
2396 break;
2397 rdie = (const struct rsn_rdie *) (rpos + 2);
2398 rpos += 2 + rpos[1];
2399 start = rpos;
2400
2401 while (rpos + 2 <= ric + ric_len &&
2402 rpos + 2 + rpos[1] <= ric + ric_len) {
2403 if (rpos[0] == WLAN_EID_RIC_DATA)
2404 break;
2405 rpos += 2 + rpos[1];
2406 }
2407 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
2408 rdie->descr_count,
2409 start, rpos - start);
2410 }
2411
2412 return pos;
2413 }
2414
2415
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)2416 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
2417 size_t max_len, int auth_alg,
2418 const u8 *req_ies, size_t req_ies_len)
2419 {
2420 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
2421 u8 *fte_mic, *elem_count;
2422 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
2423 int res;
2424 struct wpa_auth_config *conf;
2425 struct wpa_ft_ies parse;
2426 u8 *ric_start;
2427 u8 *anonce, *snonce;
2428 const u8 *kck;
2429 size_t kck_len;
2430 int use_sha384;
2431
2432 if (sm == NULL)
2433 return pos;
2434
2435 use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
2436 conf = &sm->wpa_auth->conf;
2437
2438 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2439 return pos;
2440
2441 end = pos + max_len;
2442
2443 if (auth_alg == WLAN_AUTH_FT ||
2444 ((auth_alg == WLAN_AUTH_FILS_SK ||
2445 auth_alg == WLAN_AUTH_FILS_SK_PFS ||
2446 auth_alg == WLAN_AUTH_FILS_PK) &&
2447 (sm->wpa_key_mgmt & (WPA_KEY_MGMT_FT_FILS_SHA256 |
2448 WPA_KEY_MGMT_FT_FILS_SHA384)))) {
2449 if (!sm->pmk_r1_name_valid) {
2450 wpa_printf(MSG_ERROR,
2451 "FT: PMKR1Name is not valid for Assoc Resp RSNE");
2452 return NULL;
2453 }
2454 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name for Assoc Resp RSNE",
2455 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2456 /*
2457 * RSN (only present if this is a Reassociation Response and
2458 * part of a fast BSS transition; or if this is a
2459 * (Re)Association Response frame during an FT initial mobility
2460 * domain association using FILS)
2461 */
2462 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
2463 if (res < 0)
2464 return NULL;
2465 rsnie = pos;
2466 rsnie_len = res;
2467 pos += res;
2468 }
2469
2470 /* Mobility Domain Information */
2471 res = wpa_write_mdie(conf, pos, end - pos);
2472 if (res < 0)
2473 return NULL;
2474 mdie = pos;
2475 mdie_len = res;
2476 pos += res;
2477
2478 /* Fast BSS Transition Information */
2479 if (auth_alg == WLAN_AUTH_FT) {
2480 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
2481 if (!subelem) {
2482 wpa_printf(MSG_DEBUG,
2483 "FT: Failed to add GTK subelement");
2484 return NULL;
2485 }
2486 r0kh_id = sm->r0kh_id;
2487 r0kh_id_len = sm->r0kh_id_len;
2488 anonce = sm->ANonce;
2489 snonce = sm->SNonce;
2490 #ifdef CONFIG_IEEE80211W
2491 if (sm->mgmt_frame_prot) {
2492 u8 *igtk;
2493 size_t igtk_len;
2494 u8 *nbuf;
2495 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
2496 if (igtk == NULL) {
2497 wpa_printf(MSG_DEBUG,
2498 "FT: Failed to add IGTK subelement");
2499 os_free(subelem);
2500 return NULL;
2501 }
2502 nbuf = os_realloc(subelem, subelem_len + igtk_len);
2503 if (nbuf == NULL) {
2504 os_free(subelem);
2505 os_free(igtk);
2506 return NULL;
2507 }
2508 subelem = nbuf;
2509 os_memcpy(subelem + subelem_len, igtk, igtk_len);
2510 subelem_len += igtk_len;
2511 os_free(igtk);
2512 }
2513 #endif /* CONFIG_IEEE80211W */
2514 #ifdef CONFIG_OCV
2515 if (wpa_auth_uses_ocv(sm)) {
2516 struct wpa_channel_info ci;
2517 u8 *nbuf, *ocipos;
2518
2519 if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
2520 wpa_printf(MSG_WARNING,
2521 "Failed to get channel info for OCI element");
2522 os_free(subelem);
2523 return NULL;
2524 }
2525
2526 subelem_len += 2 + OCV_OCI_LEN;
2527 nbuf = os_realloc(subelem, subelem_len);
2528 if (!nbuf) {
2529 os_free(subelem);
2530 return NULL;
2531 }
2532 subelem = nbuf;
2533
2534 ocipos = subelem + subelem_len - 2 - OCV_OCI_LEN;
2535 *ocipos++ = FTIE_SUBELEM_OCI;
2536 *ocipos++ = OCV_OCI_LEN;
2537 if (ocv_insert_oci(&ci, &ocipos) < 0) {
2538 os_free(subelem);
2539 return NULL;
2540 }
2541 }
2542 #endif /* CONFIG_OCV */
2543 } else {
2544 r0kh_id = conf->r0_key_holder;
2545 r0kh_id_len = conf->r0_key_holder_len;
2546 anonce = NULL;
2547 snonce = NULL;
2548 }
2549 res = wpa_write_ftie(conf, use_sha384, r0kh_id, r0kh_id_len,
2550 anonce, snonce, pos, end - pos,
2551 subelem, subelem_len);
2552 os_free(subelem);
2553 if (res < 0)
2554 return NULL;
2555 ftie = pos;
2556 ftie_len = res;
2557 pos += res;
2558
2559 if (use_sha384) {
2560 struct rsn_ftie_sha384 *_ftie =
2561 (struct rsn_ftie_sha384 *) (ftie + 2);
2562
2563 fte_mic = _ftie->mic;
2564 elem_count = &_ftie->mic_control[1];
2565 } else {
2566 struct rsn_ftie *_ftie = (struct rsn_ftie *) (ftie + 2);
2567
2568 fte_mic = _ftie->mic;
2569 elem_count = &_ftie->mic_control[1];
2570 }
2571 if (auth_alg == WLAN_AUTH_FT)
2572 *elem_count = 3; /* Information element count */
2573
2574 ric_start = pos;
2575 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse, use_sha384) == 0
2576 && parse.ric) {
2577 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
2578 parse.ric_len);
2579 if (auth_alg == WLAN_AUTH_FT)
2580 *elem_count +=
2581 ieee802_11_ie_count(ric_start,
2582 pos - ric_start);
2583 }
2584 if (ric_start == pos)
2585 ric_start = NULL;
2586
2587 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2588 kck = sm->PTK.kck2;
2589 kck_len = sm->PTK.kck2_len;
2590 } else {
2591 kck = sm->PTK.kck;
2592 kck_len = sm->PTK.kck_len;
2593 }
2594 if (auth_alg == WLAN_AUTH_FT &&
2595 wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 6,
2596 mdie, mdie_len, ftie, ftie_len,
2597 rsnie, rsnie_len,
2598 ric_start, ric_start ? pos - ric_start : 0,
2599 fte_mic) < 0) {
2600 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
2601 return NULL;
2602 }
2603
2604 os_free(sm->assoc_resp_ftie);
2605 sm->assoc_resp_ftie = os_malloc(ftie_len);
2606 if (!sm->assoc_resp_ftie)
2607 return NULL;
2608 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
2609
2610 return pos;
2611 }
2612
2613
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)2614 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
2615 int vlan_id,
2616 enum wpa_alg alg, const u8 *addr, int idx,
2617 u8 *key, size_t key_len)
2618 {
2619 if (wpa_auth->cb->set_key == NULL)
2620 return -1;
2621 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
2622 key, key_len);
2623 }
2624
2625
wpa_ft_install_ptk(struct wpa_state_machine * sm)2626 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
2627 {
2628 enum wpa_alg alg;
2629 int klen;
2630
2631 /* MLME-SETKEYS.request(PTK) */
2632 alg = wpa_cipher_to_alg(sm->pairwise);
2633 klen = wpa_cipher_key_len(sm->pairwise);
2634 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
2635 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
2636 "PTK configuration", sm->pairwise);
2637 return;
2638 }
2639
2640 if (sm->tk_already_set) {
2641 /* Must avoid TK reconfiguration to prevent clearing of TX/RX
2642 * PN in the driver */
2643 wpa_printf(MSG_DEBUG,
2644 "FT: Do not re-install same PTK to the driver");
2645 return;
2646 }
2647
2648 /* FIX: add STA entry to kernel/driver here? The set_key will fail
2649 * most likely without this.. At the moment, STA entry is added only
2650 * after association has been completed. This function will be called
2651 * again after association to get the PTK configured, but that could be
2652 * optimized by adding the STA entry earlier.
2653 */
2654 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2655 sm->PTK.tk, klen))
2656 return;
2657
2658 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2659 sm->pairwise_set = TRUE;
2660 sm->tk_already_set = TRUE;
2661 }
2662
2663
2664 /* 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)2665 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
2666 const u8 *req_pmk_r1_name,
2667 u8 *out_pmk_r1, int *out_pairwise,
2668 struct vlan_description *out_vlan,
2669 const u8 **out_identity, size_t *out_identity_len,
2670 const u8 **out_radius_cui,
2671 size_t *out_radius_cui_len,
2672 int *out_session_timeout)
2673 {
2674 const u8 *pmk = NULL;
2675 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
2676 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
2677 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2678 const u8 *mdid = wpa_auth->conf.mobility_domain;
2679 const u8 *r0kh = sm->r0kh_id;
2680 size_t r0kh_len = sm->r0kh_id_len;
2681 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
2682 const u8 *ssid = wpa_auth->conf.ssid;
2683 size_t ssid_len = wpa_auth->conf.ssid_len;
2684 int pairwise;
2685
2686 pairwise = sm->pairwise;
2687
2688 for (;;) {
2689 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
2690 pmk);
2691 if (pmk == NULL)
2692 break;
2693
2694 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
2695 r0kh_len, sm->addr,
2696 pmk_r0, pmk_r0_name, 0) < 0 ||
2697 wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh,
2698 sm->addr, pmk_r1, pmk_r1_name) < 0 ||
2699 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
2700 WPA_PMK_NAME_LEN) != 0)
2701 continue;
2702
2703 /* We found a PSK that matches the requested pmk_r1_name */
2704 wpa_printf(MSG_DEBUG,
2705 "FT: Found PSK to generate PMK-R1 locally");
2706 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
2707 if (out_pairwise)
2708 *out_pairwise = pairwise;
2709 os_memcpy(sm->PMK, pmk, PMK_LEN);
2710 sm->pmk_len = PMK_LEN;
2711 if (out_vlan &&
2712 wpa_ft_get_vlan(sm->wpa_auth, sm->addr, out_vlan) < 0) {
2713 wpa_printf(MSG_DEBUG, "FT: vlan not available for STA "
2714 MACSTR, MAC2STR(sm->addr));
2715 return -1;
2716 }
2717
2718 if (out_identity && out_identity_len) {
2719 *out_identity_len = wpa_ft_get_identity(
2720 sm->wpa_auth, sm->addr, out_identity);
2721 }
2722
2723 if (out_radius_cui && out_radius_cui_len) {
2724 *out_radius_cui_len = wpa_ft_get_radius_cui(
2725 sm->wpa_auth, sm->addr, out_radius_cui);
2726 }
2727
2728 if (out_session_timeout) {
2729 *out_session_timeout = wpa_ft_get_session_timeout(
2730 sm->wpa_auth, sm->addr);
2731 }
2732
2733 return 0;
2734 }
2735
2736 wpa_printf(MSG_DEBUG,
2737 "FT: Did not find PSK to generate PMK-R1 locally");
2738 return -1;
2739 }
2740
2741
2742 /* Detect the configuration the station asked for.
2743 * Required to detect FT-PSK and pairwise cipher.
2744 */
wpa_ft_set_key_mgmt(struct wpa_state_machine * sm,struct wpa_ft_ies * parse)2745 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
2746 struct wpa_ft_ies *parse)
2747 {
2748 int key_mgmt, ciphers;
2749
2750 if (sm->wpa_key_mgmt)
2751 return 0;
2752
2753 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
2754 if (!key_mgmt) {
2755 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
2756 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
2757 return -1;
2758 }
2759 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
2760 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
2761 #ifdef CONFIG_SHA384
2762 else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
2763 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384;
2764 #endif /* CONFIG_SHA384 */
2765 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
2766 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
2767 #ifdef CONFIG_FILS
2768 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
2769 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
2770 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
2771 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
2772 #endif /* CONFIG_FILS */
2773 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
2774 if (!ciphers) {
2775 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
2776 MACSTR,
2777 parse->pairwise_cipher, MAC2STR(sm->addr));
2778 return -1;
2779 }
2780 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
2781
2782 return 0;
2783 }
2784
2785
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)2786 static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
2787 struct wpa_state_machine *sm,
2788 const u8 *r0kh_id, size_t r0kh_id_len,
2789 const u8 *req_pmk_r0_name,
2790 const u8 *req_pmk_r1_name,
2791 u8 *out_pmk_r1, int *out_pairwise,
2792 struct vlan_description *vlan,
2793 const u8 **identity, size_t *identity_len,
2794 const u8 **radius_cui,
2795 size_t *radius_cui_len,
2796 int *out_session_timeout)
2797 {
2798 struct wpa_auth_config *conf = &wpa_auth->conf;
2799 const struct wpa_ft_pmk_r0_sa *r0;
2800 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
2801 int expires_in = 0;
2802 int session_timeout = 0;
2803 struct os_reltime now;
2804
2805 if (conf->r0_key_holder_len != r0kh_id_len ||
2806 os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) !=
2807 0)
2808 return -1; /* not our R0KH-ID */
2809
2810 wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration");
2811 if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) <
2812 0)
2813 return -1; /* no matching PMKR0Name in local cache */
2814
2815 wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache");
2816
2817 if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_len, r0->pmk_r0_name,
2818 conf->r1_key_holder,
2819 sm->addr, out_pmk_r1, pmk_r1_name) < 0)
2820 return -1;
2821 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", out_pmk_r1, r0->pmk_r0_len);
2822 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
2823
2824 os_get_reltime(&now);
2825 if (r0->expiration)
2826 expires_in = r0->expiration - now.sec;
2827
2828 if (r0->session_timeout)
2829 session_timeout = r0->session_timeout - now.sec;
2830
2831 wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, r0->pmk_r0_len,
2832 pmk_r1_name,
2833 sm->pairwise, r0->vlan, expires_in, session_timeout,
2834 r0->identity, r0->identity_len,
2835 r0->radius_cui, r0->radius_cui_len);
2836
2837 *out_pairwise = sm->pairwise;
2838 if (vlan) {
2839 if (r0->vlan)
2840 *vlan = *r0->vlan;
2841 else
2842 os_memset(vlan, 0, sizeof(*vlan));
2843 }
2844
2845 if (identity && identity_len) {
2846 *identity = r0->identity;
2847 *identity_len = r0->identity_len;
2848 }
2849
2850 if (radius_cui && radius_cui_len) {
2851 *radius_cui = r0->radius_cui;
2852 *radius_cui_len = r0->radius_cui_len;
2853 }
2854
2855 *out_session_timeout = session_timeout;
2856
2857 return 0;
2858 }
2859
2860
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)2861 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
2862 const u8 *ies, size_t ies_len,
2863 u8 **resp_ies, size_t *resp_ies_len)
2864 {
2865 struct rsn_mdie *mdie;
2866 u8 pmk_r1[PMK_LEN_MAX], pmk_r1_name[WPA_PMK_NAME_LEN];
2867 u8 ptk_name[WPA_PMK_NAME_LEN];
2868 struct wpa_auth_config *conf;
2869 struct wpa_ft_ies parse;
2870 size_t buflen;
2871 int ret;
2872 u8 *pos, *end;
2873 int pairwise, session_timeout = 0;
2874 struct vlan_description vlan;
2875 const u8 *identity, *radius_cui;
2876 size_t identity_len = 0, radius_cui_len = 0;
2877 int use_sha384;
2878 size_t pmk_r1_len;
2879
2880 *resp_ies = NULL;
2881 *resp_ies_len = 0;
2882
2883 sm->pmk_r1_name_valid = 0;
2884 conf = &sm->wpa_auth->conf;
2885
2886 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
2887 ies, ies_len);
2888
2889 if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) {
2890 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
2891 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2892 }
2893 use_sha384 = wpa_key_mgmt_sha384(parse.key_mgmt);
2894 pmk_r1_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
2895
2896 mdie = (struct rsn_mdie *) parse.mdie;
2897 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
2898 os_memcmp(mdie->mobility_domain,
2899 sm->wpa_auth->conf.mobility_domain,
2900 MOBILITY_DOMAIN_ID_LEN) != 0) {
2901 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
2902 return WLAN_STATUS_INVALID_MDIE;
2903 }
2904
2905 if (use_sha384) {
2906 struct rsn_ftie_sha384 *ftie;
2907
2908 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
2909 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
2910 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2911 return WLAN_STATUS_INVALID_FTIE;
2912 }
2913
2914 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
2915 } else {
2916 struct rsn_ftie *ftie;
2917
2918 ftie = (struct rsn_ftie *) parse.ftie;
2919 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
2920 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2921 return WLAN_STATUS_INVALID_FTIE;
2922 }
2923
2924 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
2925 }
2926
2927 if (parse.r0kh_id == NULL) {
2928 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
2929 return WLAN_STATUS_INVALID_FTIE;
2930 }
2931
2932 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
2933 parse.r0kh_id, parse.r0kh_id_len);
2934 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
2935 sm->r0kh_id_len = parse.r0kh_id_len;
2936
2937 if (parse.rsn_pmkid == NULL) {
2938 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
2939 return WLAN_STATUS_INVALID_PMKID;
2940 }
2941
2942 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
2943 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2944
2945 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
2946 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
2947 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
2948 sm->wpa_auth->conf.r1_key_holder, sm->addr,
2949 pmk_r1_name, use_sha384) < 0)
2950 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2951 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
2952 pmk_r1_name, WPA_PMK_NAME_LEN);
2953
2954 if (conf->ft_psk_generate_local &&
2955 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
2956 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise,
2957 &vlan, &identity, &identity_len,
2958 &radius_cui, &radius_cui_len,
2959 &session_timeout) < 0)
2960 return WLAN_STATUS_INVALID_PMKID;
2961 wpa_printf(MSG_DEBUG,
2962 "FT: Generated PMK-R1 for FT-PSK locally");
2963 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
2964 pmk_r1, &pmk_r1_len, &pairwise, &vlan,
2965 &identity, &identity_len, &radius_cui,
2966 &radius_cui_len, &session_timeout) < 0) {
2967 wpa_printf(MSG_DEBUG,
2968 "FT: No PMK-R1 available in local cache for the requested PMKR1Name");
2969 if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm,
2970 parse.r0kh_id, parse.r0kh_id_len,
2971 parse.rsn_pmkid,
2972 pmk_r1_name, pmk_r1, &pairwise,
2973 &vlan, &identity, &identity_len,
2974 &radius_cui, &radius_cui_len,
2975 &session_timeout) == 0) {
2976 wpa_printf(MSG_DEBUG,
2977 "FT: Generated PMK-R1 based on local PMK-R0");
2978 goto pmk_r1_derived;
2979 }
2980
2981 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
2982 wpa_printf(MSG_DEBUG,
2983 "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
2984 return WLAN_STATUS_INVALID_PMKID;
2985 }
2986
2987 return -1; /* Status pending */
2988 } else {
2989 wpa_printf(MSG_DEBUG, "FT: Found PMKR1Name from local cache");
2990 }
2991
2992 pmk_r1_derived:
2993 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, pmk_r1_len);
2994 sm->pmk_r1_name_valid = 1;
2995 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
2996 os_memcpy(sm->pmk_r1, pmk_r1, pmk_r1_len);
2997 sm->pmk_r1_len = pmk_r1_len;
2998
2999 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
3000 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
3001 "ANonce");
3002 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3003 }
3004
3005 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
3006 sm->SNonce, WPA_NONCE_LEN);
3007 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
3008 sm->ANonce, WPA_NONCE_LEN);
3009
3010 if (wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
3011 sm->addr, sm->wpa_auth->addr, pmk_r1_name,
3012 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
3013 pairwise) < 0)
3014 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3015
3016 sm->pairwise = pairwise;
3017 sm->PTK_valid = TRUE;
3018 sm->tk_already_set = FALSE;
3019 wpa_ft_install_ptk(sm);
3020
3021 if (wpa_ft_set_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
3022 wpa_printf(MSG_DEBUG, "FT: Failed to configure VLAN");
3023 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3024 }
3025 if (wpa_ft_set_identity(sm->wpa_auth, sm->addr,
3026 identity, identity_len) < 0 ||
3027 wpa_ft_set_radius_cui(sm->wpa_auth, sm->addr,
3028 radius_cui, radius_cui_len) < 0) {
3029 wpa_printf(MSG_DEBUG, "FT: Failed to configure identity/CUI");
3030 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3031 }
3032 wpa_ft_set_session_timeout(sm->wpa_auth, sm->addr, session_timeout);
3033
3034 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
3035 2 + FT_R1KH_ID_LEN + 200;
3036 *resp_ies = os_zalloc(buflen);
3037 if (*resp_ies == NULL)
3038 goto fail;
3039
3040 pos = *resp_ies;
3041 end = *resp_ies + buflen;
3042
3043 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
3044 if (ret < 0)
3045 goto fail;
3046 pos += ret;
3047
3048 ret = wpa_write_mdie(conf, pos, end - pos);
3049 if (ret < 0)
3050 goto fail;
3051 pos += ret;
3052
3053 ret = wpa_write_ftie(conf, use_sha384, parse.r0kh_id, parse.r0kh_id_len,
3054 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
3055 if (ret < 0)
3056 goto fail;
3057 pos += ret;
3058
3059 *resp_ies_len = pos - *resp_ies;
3060
3061 return WLAN_STATUS_SUCCESS;
3062 fail:
3063 os_free(*resp_ies);
3064 *resp_ies = NULL;
3065 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3066 }
3067
3068
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)3069 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
3070 u16 auth_transaction, const u8 *ies, size_t ies_len,
3071 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
3072 u16 auth_transaction, u16 status,
3073 const u8 *ies, size_t ies_len),
3074 void *ctx)
3075 {
3076 u16 status;
3077 u8 *resp_ies;
3078 size_t resp_ies_len;
3079 int res;
3080
3081 if (sm == NULL) {
3082 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
3083 "WPA SM not available");
3084 return;
3085 }
3086
3087 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
3088 " BSSID=" MACSTR " transaction=%d",
3089 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
3090 sm->ft_pending_cb = cb;
3091 sm->ft_pending_cb_ctx = ctx;
3092 sm->ft_pending_auth_transaction = auth_transaction;
3093 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
3094 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
3095 &resp_ies_len);
3096 if (res < 0) {
3097 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
3098 return;
3099 }
3100 status = res;
3101
3102 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
3103 " auth_transaction=%d status=%u (%s)",
3104 MAC2STR(sm->addr), auth_transaction + 1, status,
3105 status2str(status));
3106 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
3107 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
3108 resp_ies, resp_ies_len);
3109 os_free(resp_ies);
3110 }
3111
3112
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)3113 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
3114 size_t ies_len)
3115 {
3116 struct wpa_ft_ies parse;
3117 struct rsn_mdie *mdie;
3118 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
3119 size_t mic_len = 16;
3120 unsigned int count;
3121 const u8 *kck;
3122 size_t kck_len;
3123 int use_sha384;
3124 const u8 *anonce, *snonce, *fte_mic;
3125 u8 fte_elem_count;
3126
3127 if (sm == NULL)
3128 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3129
3130 use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
3131
3132 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
3133
3134 if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
3135 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
3136 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3137 }
3138
3139 if (parse.rsn == NULL) {
3140 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
3141 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3142 }
3143
3144 if (parse.rsn_pmkid == NULL) {
3145 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
3146 return WLAN_STATUS_INVALID_PMKID;
3147 }
3148
3149 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
3150 != 0) {
3151 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
3152 "with the PMKR1Name derived from auth request");
3153 return WLAN_STATUS_INVALID_PMKID;
3154 }
3155
3156 mdie = (struct rsn_mdie *) parse.mdie;
3157 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
3158 os_memcmp(mdie->mobility_domain,
3159 sm->wpa_auth->conf.mobility_domain,
3160 MOBILITY_DOMAIN_ID_LEN) != 0) {
3161 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
3162 return WLAN_STATUS_INVALID_MDIE;
3163 }
3164
3165 if (use_sha384) {
3166 struct rsn_ftie_sha384 *ftie;
3167
3168 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
3169 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
3170 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3171 return WLAN_STATUS_INVALID_FTIE;
3172 }
3173
3174 anonce = ftie->anonce;
3175 snonce = ftie->snonce;
3176 fte_elem_count = ftie->mic_control[1];
3177 fte_mic = ftie->mic;
3178 } else {
3179 struct rsn_ftie *ftie;
3180
3181 ftie = (struct rsn_ftie *) parse.ftie;
3182 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
3183 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
3184 return WLAN_STATUS_INVALID_FTIE;
3185 }
3186
3187 anonce = ftie->anonce;
3188 snonce = ftie->snonce;
3189 fte_elem_count = ftie->mic_control[1];
3190 fte_mic = ftie->mic;
3191 }
3192
3193 if (os_memcmp(snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
3194 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
3195 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
3196 snonce, WPA_NONCE_LEN);
3197 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
3198 sm->SNonce, WPA_NONCE_LEN);
3199 return WLAN_STATUS_INVALID_FTIE;
3200 }
3201
3202 if (os_memcmp(anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
3203 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
3204 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
3205 anonce, WPA_NONCE_LEN);
3206 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
3207 sm->ANonce, WPA_NONCE_LEN);
3208 return WLAN_STATUS_INVALID_FTIE;
3209 }
3210
3211
3212 if (parse.r0kh_id == NULL) {
3213 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
3214 return WLAN_STATUS_INVALID_FTIE;
3215 }
3216
3217 if (parse.r0kh_id_len != sm->r0kh_id_len ||
3218 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
3219 {
3220 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
3221 "the current R0KH-ID");
3222 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
3223 parse.r0kh_id, parse.r0kh_id_len);
3224 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
3225 sm->r0kh_id, sm->r0kh_id_len);
3226 return WLAN_STATUS_INVALID_FTIE;
3227 }
3228
3229 if (parse.r1kh_id == NULL) {
3230 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
3231 return WLAN_STATUS_INVALID_FTIE;
3232 }
3233
3234 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
3235 FT_R1KH_ID_LEN) != 0) {
3236 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
3237 "ReassocReq");
3238 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
3239 parse.r1kh_id, FT_R1KH_ID_LEN);
3240 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
3241 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
3242 return WLAN_STATUS_INVALID_FTIE;
3243 }
3244
3245 if (parse.rsn_pmkid == NULL ||
3246 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
3247 {
3248 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
3249 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
3250 return WLAN_STATUS_INVALID_PMKID;
3251 }
3252
3253 count = 3;
3254 if (parse.ric)
3255 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
3256 if (fte_elem_count != count) {
3257 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
3258 "Control: received %u expected %u",
3259 fte_elem_count, count);
3260 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3261 }
3262
3263 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
3264 kck = sm->PTK.kck2;
3265 kck_len = sm->PTK.kck2_len;
3266 } else {
3267 kck = sm->PTK.kck;
3268 kck_len = sm->PTK.kck_len;
3269 }
3270 if (wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 5,
3271 parse.mdie - 2, parse.mdie_len + 2,
3272 parse.ftie - 2, parse.ftie_len + 2,
3273 parse.rsn - 2, parse.rsn_len + 2,
3274 parse.ric, parse.ric_len,
3275 mic) < 0) {
3276 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
3277 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3278 }
3279
3280 if (os_memcmp_const(mic, fte_mic, mic_len) != 0) {
3281 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
3282 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
3283 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
3284 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
3285 fte_mic, mic_len);
3286 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
3287 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
3288 parse.mdie - 2, parse.mdie_len + 2);
3289 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
3290 parse.ftie - 2, parse.ftie_len + 2);
3291 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
3292 parse.rsn - 2, parse.rsn_len + 2);
3293 return WLAN_STATUS_INVALID_FTIE;
3294 }
3295
3296 #ifdef CONFIG_OCV
3297 if (wpa_auth_uses_ocv(sm)) {
3298 struct wpa_channel_info ci;
3299 int tx_chanwidth;
3300 int tx_seg1_idx;
3301
3302 if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
3303 wpa_printf(MSG_WARNING,
3304 "Failed to get channel info to validate received OCI in (Re)Assoc Request");
3305 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3306 }
3307
3308 if (get_sta_tx_parameters(sm,
3309 channel_width_to_int(ci.chanwidth),
3310 ci.seg1_idx, &tx_chanwidth,
3311 &tx_seg1_idx) < 0)
3312 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3313
3314 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
3315 tx_chanwidth, tx_seg1_idx) != 0) {
3316 wpa_printf(MSG_WARNING, "%s", ocv_errorstr);
3317 return WLAN_STATUS_UNSPECIFIED_FAILURE;
3318 }
3319 }
3320 #endif /* CONFIG_OCV */
3321
3322 return WLAN_STATUS_SUCCESS;
3323 }
3324
3325
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)3326 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
3327 {
3328 const u8 *sta_addr, *target_ap;
3329 const u8 *ies;
3330 size_t ies_len;
3331 u8 action;
3332 struct ft_rrb_frame *frame;
3333
3334 if (sm == NULL)
3335 return -1;
3336
3337 /*
3338 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
3339 * FT Request action frame body[variable]
3340 */
3341
3342 if (len < 14) {
3343 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
3344 "(len=%lu)", (unsigned long) len);
3345 return -1;
3346 }
3347
3348 action = data[1];
3349 sta_addr = data + 2;
3350 target_ap = data + 8;
3351 ies = data + 14;
3352 ies_len = len - 14;
3353
3354 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
3355 " Target AP=" MACSTR " Action=%d)",
3356 MAC2STR(sta_addr), MAC2STR(target_ap), action);
3357
3358 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
3359 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
3360 "STA=" MACSTR " STA-Address=" MACSTR,
3361 MAC2STR(sm->addr), MAC2STR(sta_addr));
3362 return -1;
3363 }
3364
3365 /*
3366 * Do some sanity checking on the target AP address (not own and not
3367 * broadcast. This could be extended to filter based on a list of known
3368 * APs in the MD (if such a list were configured).
3369 */
3370 if ((target_ap[0] & 0x01) ||
3371 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
3372 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
3373 "frame");
3374 return -1;
3375 }
3376
3377 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
3378
3379 if (!sm->wpa_auth->conf.ft_over_ds) {
3380 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
3381 return -1;
3382 }
3383
3384 /* RRB - Forward action frame to the target AP */
3385 frame = os_malloc(sizeof(*frame) + len);
3386 if (frame == NULL)
3387 return -1;
3388 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
3389 frame->packet_type = FT_PACKET_REQUEST;
3390 frame->action_length = host_to_le16(len);
3391 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
3392 os_memcpy(frame + 1, data, len);
3393
3394 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
3395 sizeof(*frame) + len);
3396 os_free(frame);
3397
3398 return 0;
3399 }
3400
3401
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)3402 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
3403 u16 auth_transaction, u16 resp,
3404 const u8 *ies, size_t ies_len)
3405 {
3406 struct wpa_state_machine *sm = ctx;
3407 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
3408 MAC2STR(sm->addr));
3409 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
3410 WLAN_STATUS_SUCCESS, ies, ies_len);
3411 }
3412
3413
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)3414 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
3415 const u8 *current_ap, const u8 *sta_addr,
3416 const u8 *body, size_t len)
3417 {
3418 struct wpa_state_machine *sm;
3419 u16 status;
3420 u8 *resp_ies;
3421 size_t resp_ies_len;
3422 int res;
3423
3424 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
3425 if (sm == NULL) {
3426 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
3427 "RRB Request");
3428 return -1;
3429 }
3430
3431 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
3432
3433 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
3434 sm->ft_pending_cb_ctx = sm;
3435 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
3436 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
3437 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
3438 &resp_ies_len);
3439 if (res < 0) {
3440 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
3441 return 0;
3442 }
3443 status = res;
3444
3445 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
3446 resp_ies, resp_ies_len);
3447 os_free(resp_ies);
3448 return res;
3449 }
3450
3451
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)3452 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
3453 const u8 *current_ap, const u8 *sta_addr,
3454 u16 status, const u8 *resp_ies,
3455 size_t resp_ies_len)
3456 {
3457 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3458 size_t rlen;
3459 struct ft_rrb_frame *frame;
3460 u8 *pos;
3461
3462 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
3463 " CurrentAP=" MACSTR " status=%u (%s)",
3464 MAC2STR(sm->addr), MAC2STR(current_ap), status,
3465 status2str(status));
3466 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
3467
3468 /* RRB - Forward action frame response to the Current AP */
3469
3470 /*
3471 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
3472 * Status_Code[2] FT Request action frame body[variable]
3473 */
3474 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
3475
3476 frame = os_malloc(sizeof(*frame) + rlen);
3477 if (frame == NULL)
3478 return -1;
3479 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
3480 frame->packet_type = FT_PACKET_RESPONSE;
3481 frame->action_length = host_to_le16(rlen);
3482 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
3483 pos = (u8 *) (frame + 1);
3484 *pos++ = WLAN_ACTION_FT;
3485 *pos++ = 2; /* Action: Response */
3486 os_memcpy(pos, sta_addr, ETH_ALEN);
3487 pos += ETH_ALEN;
3488 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
3489 pos += ETH_ALEN;
3490 WPA_PUT_LE16(pos, status);
3491 pos += 2;
3492 if (resp_ies)
3493 os_memcpy(pos, resp_ies, resp_ies_len);
3494
3495 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
3496 sizeof(*frame) + rlen);
3497 os_free(frame);
3498
3499 return 0;
3500 }
3501
3502
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)3503 static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
3504 const struct tlv_list *tlvs,
3505 const struct wpa_ft_pmk_r0_sa *pmk_r0,
3506 const u8 *r1kh_id, const u8 *s1kh_id,
3507 const struct tlv_list *tlv_auth,
3508 const u8 *src_addr, u8 type,
3509 u8 **packet, size_t *packet_len)
3510 {
3511 u8 pmk_r1[PMK_LEN_MAX];
3512 size_t pmk_r1_len = pmk_r0->pmk_r0_len;
3513 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
3514 u8 f_pairwise[sizeof(le16)];
3515 u8 f_expires_in[sizeof(le16)];
3516 u8 f_session_timeout[sizeof(le32)];
3517 int expires_in;
3518 int session_timeout;
3519 struct os_reltime now;
3520 int ret;
3521 struct tlv_list sess_tlv[] = {
3522 { .type = FT_RRB_PMK_R1, .len = pmk_r1_len,
3523 .data = pmk_r1 },
3524 { .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
3525 .data = pmk_r1_name },
3526 { .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
3527 .data = f_pairwise },
3528 { .type = FT_RRB_EXPIRES_IN, .len = sizeof(f_expires_in),
3529 .data = f_expires_in },
3530 { .type = FT_RRB_IDENTITY, .len = pmk_r0->identity_len,
3531 .data = pmk_r0->identity },
3532 { .type = FT_RRB_RADIUS_CUI, .len = pmk_r0->radius_cui_len,
3533 .data = pmk_r0->radius_cui },
3534 { .type = FT_RRB_SESSION_TIMEOUT,
3535 .len = sizeof(f_session_timeout),
3536 .data = f_session_timeout },
3537 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3538 };
3539
3540 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_len,
3541 pmk_r0->pmk_r0_name, r1kh_id,
3542 s1kh_id, pmk_r1, pmk_r1_name) < 0)
3543 return -1;
3544 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 (for peer AP)",
3545 pmk_r1, pmk_r1_len);
3546 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name (for peer AP)",
3547 pmk_r1_name, WPA_PMK_NAME_LEN);
3548 WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);
3549
3550 os_get_reltime(&now);
3551 if (pmk_r0->expiration > now.sec)
3552 expires_in = pmk_r0->expiration - now.sec;
3553 else if (pmk_r0->expiration)
3554 expires_in = 1;
3555 else
3556 expires_in = 0;
3557 WPA_PUT_LE16(f_expires_in, expires_in);
3558
3559 if (pmk_r0->session_timeout > now.sec)
3560 session_timeout = pmk_r0->session_timeout - now.sec;
3561 else if (pmk_r0->session_timeout)
3562 session_timeout = 1;
3563 else
3564 session_timeout = 0;
3565 WPA_PUT_LE32(f_session_timeout, session_timeout);
3566
3567 ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
3568 pmk_r0->vlan, src_addr, type,
3569 packet, packet_len);
3570
3571 forced_memzero(pmk_r1, sizeof(pmk_r1));
3572
3573 return ret;
3574 }
3575
3576
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)3577 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
3578 const u8 *src_addr,
3579 const u8 *enc, size_t enc_len,
3580 const u8 *auth, size_t auth_len,
3581 int no_defer)
3582 {
3583 const char *msgtype = "pull request";
3584 u8 *plain = NULL, *packet = NULL;
3585 size_t plain_len = 0, packet_len = 0;
3586 struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
3587 const u8 *key;
3588 size_t key_len;
3589 int seq_ret;
3590 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
3591 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
3592 size_t f_pmk_r0_name_len;
3593 const struct wpa_ft_pmk_r0_sa *r0;
3594 int ret;
3595 struct tlv_list resp[2];
3596 struct tlv_list resp_auth[5];
3597 struct ft_rrb_seq f_seq;
3598
3599 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
3600
3601 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
3602 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
3603
3604 if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
3605 wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
3606 goto out;
3607 }
3608
3609 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
3610 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
3611
3612 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
3613 if (r1kh) {
3614 key = r1kh->key;
3615 key_len = sizeof(r1kh->key);
3616 } else if (r1kh_wildcard) {
3617 wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
3618 key = r1kh_wildcard->key;
3619 key_len = sizeof(r1kh_wildcard->key);
3620 } else {
3621 goto out;
3622 }
3623
3624 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
3625 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
3626
3627 seq_ret = FT_RRB_SEQ_DROP;
3628 if (r1kh)
3629 seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
3630 auth, auth_len, msgtype, no_defer);
3631 if (!no_defer && r1kh_wildcard &&
3632 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
3633 /* wildcard: r1kh-id unknown or changed addr -> do a seq req */
3634 seq_ret = FT_RRB_SEQ_DEFER;
3635 }
3636
3637 if (seq_ret == FT_RRB_SEQ_DROP)
3638 goto out;
3639
3640 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
3641 src_addr, FT_PACKET_R0KH_R1KH_PULL,
3642 &plain, &plain_len) < 0)
3643 goto out;
3644
3645 if (!r1kh)
3646 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
3647 f_r1kh_id,
3648 wpa_auth->conf.rkh_pos_timeout);
3649 if (!r1kh)
3650 goto out;
3651
3652 if (seq_ret == FT_RRB_SEQ_DEFER) {
3653 wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
3654 f_r0kh_id_len, f_r1kh_id, key, key_len,
3655 enc, enc_len, auth, auth_len,
3656 &wpa_ft_rrb_rx_pull);
3657 goto out;
3658 }
3659
3660 wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
3661 msgtype);
3662 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
3663 wpa_auth->conf.rkh_pos_timeout);
3664
3665 RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
3666 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
3667 f_pmk_r0_name_len);
3668
3669 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
3670 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
3671
3672 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
3673 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3674 goto out;
3675 }
3676
3677 resp[0].type = FT_RRB_S1KH_ID;
3678 resp[0].len = f_s1kh_id_len;
3679 resp[0].data = f_s1kh_id;
3680 resp[1].type = FT_RRB_LAST_EMPTY;
3681 resp[1].len = 0;
3682 resp[1].data = NULL;
3683
3684 resp_auth[0].type = FT_RRB_NONCE;
3685 resp_auth[0].len = f_nonce_len;
3686 resp_auth[0].data = f_nonce;
3687 resp_auth[1].type = FT_RRB_SEQ;
3688 resp_auth[1].len = sizeof(f_seq);
3689 resp_auth[1].data = (u8 *) &f_seq;
3690 resp_auth[2].type = FT_RRB_R0KH_ID;
3691 resp_auth[2].len = f_r0kh_id_len;
3692 resp_auth[2].data = f_r0kh_id;
3693 resp_auth[3].type = FT_RRB_R1KH_ID;
3694 resp_auth[3].len = f_r1kh_id_len;
3695 resp_auth[3].data = f_r1kh_id;
3696 resp_auth[4].type = FT_RRB_LAST_EMPTY;
3697 resp_auth[4].len = 0;
3698 resp_auth[4].data = NULL;
3699
3700 if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0) {
3701 wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
3702 ret = wpa_ft_rrb_build(key, key_len, resp, NULL, resp_auth,
3703 NULL, wpa_auth->addr,
3704 FT_PACKET_R0KH_R1KH_RESP,
3705 &packet, &packet_len);
3706 } else {
3707 ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id,
3708 f_s1kh_id, resp_auth, wpa_auth->addr,
3709 FT_PACKET_R0KH_R1KH_RESP,
3710 &packet, &packet_len);
3711 }
3712
3713 if (!ret)
3714 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
3715 FT_PACKET_R0KH_R1KH_RESP, packet,
3716 packet_len);
3717
3718 out:
3719 os_free(plain);
3720 os_free(packet);
3721
3722 return 0;
3723 }
3724
3725
3726 /* @returns 0 on success
3727 * -1 on error
3728 * -2 if FR_RRB_PAIRWISE is missing
3729 */
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))3730 static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
3731 const u8 *src_addr, u8 type,
3732 const u8 *enc, size_t enc_len,
3733 const u8 *auth, size_t auth_len,
3734 const char *msgtype, u8 *s1kh_id_out,
3735 int (*cb)(struct wpa_authenticator *wpa_auth,
3736 const u8 *src_addr,
3737 const u8 *enc, size_t enc_len,
3738 const u8 *auth, size_t auth_len,
3739 int no_defer))
3740 {
3741 u8 *plain = NULL;
3742 size_t plain_len = 0;
3743 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
3744 const u8 *key;
3745 size_t key_len;
3746 int seq_ret;
3747 const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
3748 const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
3749 const u8 *f_expires_in;
3750 size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
3751 const u8 *f_identity, *f_radius_cui;
3752 const u8 *f_session_timeout;
3753 size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
3754 size_t f_expires_in_len;
3755 size_t f_identity_len, f_radius_cui_len;
3756 size_t f_session_timeout_len;
3757 int pairwise;
3758 int ret = -1;
3759 int expires_in;
3760 int session_timeout;
3761 struct vlan_description vlan;
3762 size_t pmk_r1_len;
3763
3764 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
3765 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
3766
3767 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
3768 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
3769
3770 if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
3771 wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
3772 goto out;
3773 }
3774
3775 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
3776 &r0kh_wildcard);
3777 if (r0kh) {
3778 key = r0kh->key;
3779 key_len = sizeof(r0kh->key);
3780 } else if (r0kh_wildcard) {
3781 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
3782 key = r0kh_wildcard->key;
3783 key_len = sizeof(r0kh_wildcard->key);
3784 } else {
3785 goto out;
3786 }
3787
3788 seq_ret = FT_RRB_SEQ_DROP;
3789 if (r0kh) {
3790 seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
3791 auth, auth_len, msgtype,
3792 cb ? 0 : 1);
3793 }
3794 if (cb && r0kh_wildcard &&
3795 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
3796 /* wildcard: r0kh-id unknown or changed addr -> do a seq req */
3797 seq_ret = FT_RRB_SEQ_DEFER;
3798 }
3799
3800 if (seq_ret == FT_RRB_SEQ_DROP)
3801 goto out;
3802
3803 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
3804 src_addr, type, &plain, &plain_len) < 0)
3805 goto out;
3806
3807 if (!r0kh)
3808 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
3809 f_r0kh_id, f_r0kh_id_len,
3810 wpa_auth->conf.rkh_pos_timeout);
3811 if (!r0kh)
3812 goto out;
3813
3814 if (seq_ret == FT_RRB_SEQ_DEFER) {
3815 wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
3816 f_r0kh_id_len, f_r1kh_id, key, key_len,
3817 enc, enc_len, auth, auth_len, cb);
3818 goto out;
3819 }
3820
3821 wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
3822 msgtype);
3823 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
3824 wpa_auth->conf.rkh_pos_timeout);
3825
3826 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
3827 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
3828
3829 if (s1kh_id_out)
3830 os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);
3831
3832 ret = -2;
3833 RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
3834 wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);
3835
3836 ret = -1;
3837 RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
3838 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
3839 f_pmk_r1_name, WPA_PMK_NAME_LEN);
3840
3841 pmk_r1_len = PMK_LEN;
3842 if (wpa_ft_rrb_get_tlv(plain, plain_len, FT_RRB_PMK_R1, &f_pmk_r1_len,
3843 &f_pmk_r1) == 0 &&
3844 (f_pmk_r1_len == PMK_LEN || f_pmk_r1_len == SHA384_MAC_LEN))
3845 pmk_r1_len = f_pmk_r1_len;
3846 RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, pmk_r1_len);
3847 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, pmk_r1_len);
3848
3849 pairwise = WPA_GET_LE16(f_pairwise);
3850
3851 RRB_GET_OPTIONAL(FT_RRB_EXPIRES_IN, expires_in, msgtype,
3852 sizeof(le16));
3853 if (f_expires_in)
3854 expires_in = WPA_GET_LE16(f_expires_in);
3855 else
3856 expires_in = 0;
3857
3858 wpa_printf(MSG_DEBUG, "FT: PMK-R1 %s - expires_in=%d", msgtype,
3859 expires_in);
3860
3861 if (wpa_ft_rrb_get_tlv_vlan(plain, plain_len, &vlan) < 0) {
3862 wpa_printf(MSG_DEBUG, "FT: Cannot parse vlan");
3863 wpa_ft_rrb_dump(plain, plain_len);
3864 goto out;
3865 }
3866
3867 wpa_printf(MSG_DEBUG, "FT: vlan %d%s",
3868 le_to_host16(vlan.untagged), vlan.tagged[0] ? "+" : "");
3869
3870 RRB_GET_OPTIONAL(FT_RRB_IDENTITY, identity, msgtype, -1);
3871 if (f_identity)
3872 wpa_hexdump_ascii(MSG_DEBUG, "FT: Identity", f_identity,
3873 f_identity_len);
3874
3875 RRB_GET_OPTIONAL(FT_RRB_RADIUS_CUI, radius_cui, msgtype, -1);
3876 if (f_radius_cui)
3877 wpa_hexdump_ascii(MSG_DEBUG, "FT: CUI", f_radius_cui,
3878 f_radius_cui_len);
3879
3880 RRB_GET_OPTIONAL(FT_RRB_SESSION_TIMEOUT, session_timeout, msgtype,
3881 sizeof(le32));
3882 if (f_session_timeout)
3883 session_timeout = WPA_GET_LE32(f_session_timeout);
3884 else
3885 session_timeout = 0;
3886 wpa_printf(MSG_DEBUG, "FT: session_timeout %d", session_timeout);
3887
3888 if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, pmk_r1_len,
3889 f_pmk_r1_name,
3890 pairwise, &vlan, expires_in, session_timeout,
3891 f_identity, f_identity_len, f_radius_cui,
3892 f_radius_cui_len) < 0)
3893 goto out;
3894
3895 ret = 0;
3896 out:
3897 bin_clear_free(plain, plain_len);
3898
3899 return ret;
3900
3901 }
3902
3903
ft_finish_pull(struct wpa_state_machine * sm)3904 static void ft_finish_pull(struct wpa_state_machine *sm)
3905 {
3906 int res;
3907 u8 *resp_ies;
3908 size_t resp_ies_len;
3909 u16 status;
3910
3911 if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
3912 return;
3913
3914 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
3915 wpabuf_len(sm->ft_pending_req_ies),
3916 &resp_ies, &resp_ies_len);
3917 if (res < 0) {
3918 /* this loop is broken by ft_pending_pull_left_retries */
3919 wpa_printf(MSG_DEBUG,
3920 "FT: Callback postponed until response is available");
3921 return;
3922 }
3923 wpabuf_free(sm->ft_pending_req_ies);
3924 sm->ft_pending_req_ies = NULL;
3925 status = res;
3926 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
3927 " - status %u", MAC2STR(sm->addr), status);
3928
3929 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
3930 sm->ft_pending_auth_transaction + 1, status,
3931 resp_ies, resp_ies_len);
3932 os_free(resp_ies);
3933 }
3934
3935
3936 struct ft_get_sta_ctx {
3937 const u8 *nonce;
3938 const u8 *s1kh_id;
3939 struct wpa_state_machine *sm;
3940 };
3941
3942
ft_get_sta_cb(struct wpa_state_machine * sm,void * ctx)3943 static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
3944 {
3945 struct ft_get_sta_ctx *info = ctx;
3946
3947 if ((info->s1kh_id &&
3948 os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) ||
3949 os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
3950 FT_RRB_NONCE_LEN) != 0 ||
3951 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
3952 return 0;
3953
3954 info->sm = sm;
3955
3956 return 1;
3957 }
3958
3959
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)3960 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
3961 const u8 *src_addr,
3962 const u8 *enc, size_t enc_len,
3963 const u8 *auth, size_t auth_len,
3964 int no_defer)
3965 {
3966 const char *msgtype = "pull response";
3967 int nak, ret = -1;
3968 struct ft_get_sta_ctx ctx;
3969 u8 s1kh_id[ETH_ALEN];
3970 const u8 *f_nonce;
3971 size_t f_nonce_len;
3972
3973 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
3974
3975 RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
3976 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
3977
3978 os_memset(&ctx, 0, sizeof(ctx));
3979 ctx.nonce = f_nonce;
3980 if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
3981 /* nonce not found */
3982 wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
3983 return -1;
3984 }
3985
3986 ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
3987 enc, enc_len, auth, auth_len, msgtype, s1kh_id,
3988 no_defer ? NULL : &wpa_ft_rrb_rx_resp);
3989 if (ret == -2) {
3990 ret = 0;
3991 nak = 1;
3992 } else {
3993 nak = 0;
3994 }
3995 if (ret < 0)
3996 return -1;
3997
3998 ctx.s1kh_id = s1kh_id;
3999 if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
4000 wpa_printf(MSG_DEBUG,
4001 "FT: Response to a pending pull request for " MACSTR,
4002 MAC2STR(ctx.sm->addr));
4003 eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
4004 if (nak)
4005 ctx.sm->ft_pending_pull_left_retries = 0;
4006 ft_finish_pull(ctx.sm);
4007 }
4008
4009 out:
4010 return ret;
4011 }
4012
4013
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)4014 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
4015 const u8 *src_addr,
4016 const u8 *enc, size_t enc_len,
4017 const u8 *auth, size_t auth_len, int no_defer)
4018 {
4019 const char *msgtype = "push";
4020
4021 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
4022
4023 if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
4024 enc, enc_len, auth, auth_len, msgtype, NULL,
4025 no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
4026 return -1;
4027
4028 return 0;
4029 }
4030
4031
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)4032 static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
4033 const u8 *src_addr, int type,
4034 const u8 *enc, size_t enc_len,
4035 const u8 *auth, size_t auth_len,
4036 struct ft_remote_seq **rkh_seq,
4037 u8 **key, size_t *key_len,
4038 struct ft_remote_r0kh **r0kh_out,
4039 struct ft_remote_r1kh **r1kh_out,
4040 struct ft_remote_r0kh **r0kh_wildcard_out,
4041 struct ft_remote_r1kh **r1kh_wildcard_out)
4042 {
4043 struct ft_remote_r0kh *r0kh = NULL;
4044 struct ft_remote_r1kh *r1kh = NULL;
4045 const u8 *f_r0kh_id, *f_r1kh_id;
4046 size_t f_r0kh_id_len, f_r1kh_id_len;
4047 int to_r0kh, to_r1kh;
4048 u8 *plain = NULL;
4049 size_t plain_len = 0;
4050 struct ft_remote_r0kh *r0kh_wildcard;
4051 struct ft_remote_r1kh *r1kh_wildcard;
4052
4053 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
4054 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
4055
4056 to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
4057 to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);
4058
4059 if (to_r0kh && to_r1kh) {
4060 wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
4061 goto out;
4062 }
4063
4064 if (!to_r0kh && !to_r1kh) {
4065 wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
4066 goto out;
4067 }
4068
4069 if (!to_r0kh) {
4070 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
4071 &r0kh, &r0kh_wildcard);
4072 if (!r0kh_wildcard &&
4073 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
4074 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
4075 f_r0kh_id, f_r0kh_id_len);
4076 goto out;
4077 }
4078 if (r0kh) {
4079 *key = r0kh->key;
4080 *key_len = sizeof(r0kh->key);
4081 } else {
4082 *key = r0kh_wildcard->key;
4083 *key_len = sizeof(r0kh_wildcard->key);
4084 }
4085 }
4086
4087 if (!to_r1kh) {
4088 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
4089 &r1kh_wildcard);
4090 if (!r1kh_wildcard &&
4091 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
4092 wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
4093 f_r1kh_id, FT_R1KH_ID_LEN);
4094 goto out;
4095 }
4096 if (r1kh) {
4097 *key = r1kh->key;
4098 *key_len = sizeof(r1kh->key);
4099 } else {
4100 *key = r1kh_wildcard->key;
4101 *key_len = sizeof(r1kh_wildcard->key);
4102 }
4103 }
4104
4105 if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
4106 src_addr, type, &plain, &plain_len) < 0)
4107 goto out;
4108
4109 os_free(plain);
4110
4111 if (!to_r0kh) {
4112 if (!r0kh)
4113 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
4114 src_addr, f_r0kh_id,
4115 f_r0kh_id_len,
4116 ftRRBseqTimeout);
4117 if (!r0kh)
4118 goto out;
4119
4120 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
4121 *rkh_seq = r0kh->seq;
4122 if (r0kh_out)
4123 *r0kh_out = r0kh;
4124 if (r0kh_wildcard_out)
4125 *r0kh_wildcard_out = r0kh_wildcard;
4126 }
4127
4128 if (!to_r1kh) {
4129 if (!r1kh)
4130 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
4131 src_addr, f_r1kh_id,
4132 ftRRBseqTimeout);
4133 if (!r1kh)
4134 goto out;
4135
4136 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
4137 *rkh_seq = r1kh->seq;
4138 if (r1kh_out)
4139 *r1kh_out = r1kh;
4140 if (r1kh_wildcard_out)
4141 *r1kh_wildcard_out = r1kh_wildcard;
4142 }
4143
4144 return 0;
4145 out:
4146 return -1;
4147 }
4148
4149
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)4150 static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
4151 const u8 *src_addr,
4152 const u8 *enc, size_t enc_len,
4153 const u8 *auth, size_t auth_len,
4154 int no_defer)
4155 {
4156 int ret = -1;
4157 struct ft_rrb_seq f_seq;
4158 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
4159 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
4160 struct ft_remote_seq *rkh_seq = NULL;
4161 u8 *packet = NULL, *key = NULL;
4162 size_t packet_len = 0, key_len = 0;
4163 struct tlv_list seq_resp_auth[5];
4164
4165 wpa_printf(MSG_DEBUG, "FT: Received sequence number request");
4166
4167 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
4168 enc, enc_len, auth, auth_len, &rkh_seq, &key,
4169 &key_len, NULL, NULL, NULL, NULL) < 0)
4170 goto out;
4171
4172 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
4173 wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);
4174
4175 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
4176 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
4177
4178 if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
4179 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
4180 goto out;
4181 }
4182
4183 seq_resp_auth[0].type = FT_RRB_NONCE;
4184 seq_resp_auth[0].len = f_nonce_len;
4185 seq_resp_auth[0].data = f_nonce;
4186 seq_resp_auth[1].type = FT_RRB_SEQ;
4187 seq_resp_auth[1].len = sizeof(f_seq);
4188 seq_resp_auth[1].data = (u8 *) &f_seq;
4189 seq_resp_auth[2].type = FT_RRB_R0KH_ID;
4190 seq_resp_auth[2].len = f_r0kh_id_len;
4191 seq_resp_auth[2].data = f_r0kh_id;
4192 seq_resp_auth[3].type = FT_RRB_R1KH_ID;
4193 seq_resp_auth[3].len = FT_R1KH_ID_LEN;
4194 seq_resp_auth[3].data = f_r1kh_id;
4195 seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
4196 seq_resp_auth[4].len = 0;
4197 seq_resp_auth[4].data = NULL;
4198
4199 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth, NULL,
4200 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
4201 &packet, &packet_len) < 0)
4202 goto out;
4203
4204 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
4205 FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
4206 packet_len);
4207
4208 out:
4209 os_free(packet);
4210
4211 return ret;
4212 }
4213
4214
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)4215 static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
4216 const u8 *src_addr,
4217 const u8 *enc, size_t enc_len,
4218 const u8 *auth, size_t auth_len,
4219 int no_defer)
4220 {
4221 u8 *key = NULL;
4222 size_t key_len = 0;
4223 struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
4224 struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
4225 const u8 *f_nonce, *f_seq;
4226 size_t f_nonce_len, f_seq_len;
4227 struct ft_remote_seq *rkh_seq = NULL;
4228 struct ft_remote_item *item;
4229 struct os_reltime now, now_remote;
4230 int seq_ret, found;
4231 const struct ft_rrb_seq *msg_both;
4232 u32 msg_dom, msg_seq;
4233
4234 wpa_printf(MSG_DEBUG, "FT: Received sequence number response");
4235
4236 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
4237 enc, enc_len, auth, auth_len, &rkh_seq, &key,
4238 &key_len, &r0kh, &r1kh, &r0kh_wildcard,
4239 &r1kh_wildcard) < 0)
4240 goto out;
4241
4242 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
4243 wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
4244 f_nonce_len);
4245
4246 found = 0;
4247 dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
4248 list) {
4249 if (os_memcmp_const(f_nonce, item->nonce,
4250 FT_RRB_NONCE_LEN) != 0 ||
4251 os_get_reltime(&now) < 0 ||
4252 os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
4253 continue;
4254
4255 found = 1;
4256 break;
4257 }
4258 if (!found) {
4259 wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
4260 goto out;
4261 }
4262
4263 if (r0kh) {
4264 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
4265 wpa_auth->conf.rkh_pos_timeout);
4266 if (r0kh_wildcard)
4267 os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
4268 }
4269
4270 if (r1kh) {
4271 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
4272 wpa_auth->conf.rkh_pos_timeout);
4273 if (r1kh_wildcard)
4274 os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
4275 }
4276
4277 seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
4278 auth_len, "seq response", 1);
4279 if (seq_ret == FT_RRB_SEQ_OK) {
4280 wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
4281 wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
4282 auth_len, "seq response");
4283 } else {
4284 wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");
4285
4286 RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
4287 sizeof(*msg_both));
4288 msg_both = (const struct ft_rrb_seq *) f_seq;
4289
4290 msg_dom = le_to_host32(msg_both->dom);
4291 msg_seq = le_to_host32(msg_both->seq);
4292 now_remote.sec = le_to_host32(msg_both->ts);
4293 now_remote.usec = 0;
4294
4295 rkh_seq->rx.num_last = 2;
4296 rkh_seq->rx.dom = msg_dom;
4297 rkh_seq->rx.offsetidx = 0;
4298 /* Accept some older, possibly cached packets as well */
4299 rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
4300 dl_list_len(&rkh_seq->rx.queue);
4301 rkh_seq->rx.last[1] = msg_seq;
4302
4303 /* local time - offset = remote time
4304 * <=> local time - remote time = offset */
4305 os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
4306 }
4307
4308 wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);
4309
4310 return 0;
4311 out:
4312 return -1;
4313 }
4314
4315
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)4316 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
4317 const u8 *data, size_t data_len)
4318 {
4319 struct ft_rrb_frame *frame;
4320 u16 alen;
4321 const u8 *pos, *end, *start;
4322 u8 action;
4323 const u8 *sta_addr, *target_ap_addr;
4324
4325 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
4326 MAC2STR(src_addr));
4327
4328 if (data_len < sizeof(*frame)) {
4329 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
4330 (unsigned long) data_len);
4331 return -1;
4332 }
4333
4334 pos = data;
4335 frame = (struct ft_rrb_frame *) pos;
4336 pos += sizeof(*frame);
4337
4338 alen = le_to_host16(frame->action_length);
4339 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
4340 "action_length=%d ap_address=" MACSTR,
4341 frame->frame_type, frame->packet_type, alen,
4342 MAC2STR(frame->ap_address));
4343
4344 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
4345 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
4346 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
4347 "unrecognized type %d", frame->frame_type);
4348 return -1;
4349 }
4350
4351 if (alen > data_len - sizeof(*frame)) {
4352 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
4353 "frame");
4354 return -1;
4355 }
4356
4357 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
4358
4359 if (alen < 1 + 1 + 2 * ETH_ALEN) {
4360 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
4361 "room for Action Frame body); alen=%lu",
4362 (unsigned long) alen);
4363 return -1;
4364 }
4365 start = pos;
4366 end = pos + alen;
4367
4368 if (*pos != WLAN_ACTION_FT) {
4369 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
4370 "%d", *pos);
4371 return -1;
4372 }
4373
4374 pos++;
4375 action = *pos++;
4376 sta_addr = pos;
4377 pos += ETH_ALEN;
4378 target_ap_addr = pos;
4379 pos += ETH_ALEN;
4380 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
4381 MACSTR " target_ap_addr=" MACSTR,
4382 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
4383
4384 if (frame->packet_type == FT_PACKET_REQUEST) {
4385 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
4386
4387 if (action != 1) {
4388 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
4389 "RRB Request", action);
4390 return -1;
4391 }
4392
4393 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
4394 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
4395 "RRB Request does not match with own "
4396 "address");
4397 return -1;
4398 }
4399
4400 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
4401 sta_addr, pos, end - pos) < 0)
4402 return -1;
4403 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
4404 u16 status_code;
4405
4406 if (end - pos < 2) {
4407 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
4408 "code in RRB Response");
4409 return -1;
4410 }
4411 status_code = WPA_GET_LE16(pos);
4412 pos += 2;
4413
4414 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
4415 "(status_code=%d)", status_code);
4416
4417 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
4418 return -1;
4419 } else {
4420 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
4421 "packet_type %d", frame->packet_type);
4422 return -1;
4423 }
4424
4425 if (end > pos) {
4426 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
4427 pos, end - pos);
4428 }
4429
4430 return 0;
4431 }
4432
4433
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)4434 void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
4435 const u8 *dst_addr, u8 oui_suffix, const u8 *data,
4436 size_t data_len)
4437 {
4438 const u8 *auth, *enc;
4439 size_t alen, elen;
4440 int no_defer = 0;
4441
4442 wpa_printf(MSG_DEBUG, "FT: RRB-OUI received frame from remote AP "
4443 MACSTR, MAC2STR(src_addr));
4444 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame - oui_suffix=%d", oui_suffix);
4445 wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", data, data_len);
4446
4447 if (is_multicast_ether_addr(src_addr)) {
4448 wpa_printf(MSG_DEBUG,
4449 "FT: RRB-OUI received frame from multicast address "
4450 MACSTR, MAC2STR(src_addr));
4451 return;
4452 }
4453
4454 if (is_multicast_ether_addr(dst_addr)) {
4455 wpa_printf(MSG_DEBUG,
4456 "FT: RRB-OUI received frame from remote AP " MACSTR
4457 " to multicast address " MACSTR,
4458 MAC2STR(src_addr), MAC2STR(dst_addr));
4459 no_defer = 1;
4460 }
4461
4462 if (data_len < sizeof(u16)) {
4463 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
4464 return;
4465 }
4466
4467 alen = WPA_GET_LE16(data);
4468 if (data_len < sizeof(u16) + alen) {
4469 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
4470 return;
4471 }
4472
4473 auth = data + sizeof(u16);
4474 wpa_hexdump(MSG_MSGDUMP, "FT: Authenticated payload", auth, alen);
4475 enc = data + sizeof(u16) + alen;
4476 elen = data_len - sizeof(u16) - alen;
4477 wpa_hexdump(MSG_MSGDUMP, "FT: Encrypted payload", enc, elen);
4478
4479 switch (oui_suffix) {
4480 case FT_PACKET_R0KH_R1KH_PULL:
4481 wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
4482 no_defer);
4483 break;
4484 case FT_PACKET_R0KH_R1KH_RESP:
4485 wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
4486 no_defer);
4487 break;
4488 case FT_PACKET_R0KH_R1KH_PUSH:
4489 wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
4490 no_defer);
4491 break;
4492 case FT_PACKET_R0KH_R1KH_SEQ_REQ:
4493 wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
4494 no_defer);
4495 break;
4496 case FT_PACKET_R0KH_R1KH_SEQ_RESP:
4497 wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
4498 alen, no_defer);
4499 break;
4500 }
4501 }
4502
4503
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)4504 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
4505 struct wpa_ft_pmk_r0_sa *pmk_r0,
4506 struct ft_remote_r1kh *r1kh,
4507 const u8 *s1kh_id)
4508 {
4509 u8 *packet;
4510 size_t packet_len;
4511 struct ft_rrb_seq f_seq;
4512 struct tlv_list push[] = {
4513 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
4514 .data = s1kh_id },
4515 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
4516 .data = pmk_r0->pmk_r0_name },
4517 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
4518 };
4519 struct tlv_list push_auth[] = {
4520 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
4521 .data = (u8 *) &f_seq },
4522 { .type = FT_RRB_R0KH_ID,
4523 .len = wpa_auth->conf.r0_key_holder_len,
4524 .data = wpa_auth->conf.r0_key_holder },
4525 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
4526 .data = r1kh->id },
4527 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
4528 };
4529
4530 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
4531 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
4532 return -1;
4533 }
4534
4535 if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
4536 r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
4537 FT_PACKET_R0KH_R1KH_PUSH,
4538 &packet, &packet_len) < 0)
4539 return -1;
4540
4541 wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
4542 packet, packet_len);
4543
4544 os_free(packet);
4545 return 0;
4546 }
4547
4548
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)4549 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
4550 {
4551 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
4552 struct wpa_ft_pmk_r0_sa *r0, *r0found = NULL;
4553 struct ft_remote_r1kh *r1kh;
4554
4555 if (!wpa_auth->conf.pmk_r1_push)
4556 return;
4557 if (!wpa_auth->conf.r1kh_list)
4558 return;
4559
4560 dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
4561 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) {
4562 r0found = r0;
4563 break;
4564 }
4565 }
4566
4567 r0 = r0found;
4568 if (r0 == NULL || r0->pmk_r1_pushed)
4569 return;
4570 r0->pmk_r1_pushed = 1;
4571
4572 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
4573 "for STA " MACSTR, MAC2STR(addr));
4574
4575 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
4576 if (is_zero_ether_addr(r1kh->addr) ||
4577 is_zero_ether_addr(r1kh->id))
4578 continue;
4579 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
4580 continue;
4581 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
4582 }
4583 }
4584
4585 #endif /* CONFIG_IEEE80211R_AP */
4586