1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/list.h"
14 #include "common/ieee802_11_defs.h"
15 #include "common/ieee802_11_common.h"
16 #include "crypto/aes.h"
17 #include "crypto/aes_siv.h"
18 #include "crypto/aes_wrap.h"
19 #include "crypto/random.h"
20 #include "ap_config.h"
21 #include "ieee802_11.h"
22 #include "wmm.h"
23 #include "wpa_auth.h"
24 #include "wpa_auth_i.h"
25
26
27 #ifdef CONFIG_IEEE80211R_AP
28
29 const unsigned int ftRRBseqTimeout = 10;
30 const unsigned int ftRRBmaxQueueLen = 100;
31
32
33 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
34 const u8 *current_ap, const u8 *sta_addr,
35 u16 status, const u8 *resp_ies,
36 size_t resp_ies_len);
37 static void ft_finish_pull(struct wpa_state_machine *sm);
38 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
39 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);
40
41 struct tlv_list {
42 u16 type;
43 size_t len;
44 const u8 *data;
45 };
46
47
48 /**
49 * wpa_ft_rrb_decrypt - Decrypt FT RRB message
50 * @key: AES-SIV key for AEAD
51 * @key_len: Length of key in octets
52 * @enc: Pointer to encrypted TLVs
53 * @enc_len: Length of encrypted TLVs in octets
54 * @auth: Pointer to authenticated TLVs
55 * @auth_len: Length of authenticated TLVs in octets
56 * @src_addr: MAC address of the frame sender
57 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
58 * @plain: Pointer to return the pointer to the allocated plaintext buffer;
59 * needs to be freed by the caller if not NULL;
60 * will only be returned on success
61 * @plain_len: Pointer to return the length of the allocated plaintext buffer
62 * in octets
63 * Returns: 0 on success, -1 on error
64 */
wpa_ft_rrb_decrypt(const u8 * key,const size_t key_len,const u8 * enc,const size_t enc_len,const u8 * auth,const size_t auth_len,const u8 * src_addr,u8 type,u8 ** plain,size_t * plain_size)65 static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
66 const u8 *enc, const size_t enc_len,
67 const u8 *auth, const size_t auth_len,
68 const u8 *src_addr, u8 type,
69 u8 **plain, size_t *plain_size)
70 {
71 const u8 *ad[3] = { src_addr, auth, &type };
72 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
73
74 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
75
76 if (!key) { /* skip decryption */
77 *plain = os_memdup(enc, enc_len);
78 if (enc_len > 0 && !*plain)
79 goto err;
80
81 *plain_size = enc_len;
82
83 return 0;
84 }
85
86 *plain = NULL;
87
88 /* SIV overhead */
89 if (enc_len < AES_BLOCK_SIZE)
90 goto err;
91
92 *plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
93 if (!*plain)
94 goto err;
95
96 if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
97 *plain) < 0)
98 goto err;
99
100 *plain_size = enc_len - AES_BLOCK_SIZE;
101 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
102 *plain, *plain_size);
103 return 0;
104 err:
105 os_free(*plain);
106 *plain = NULL;
107 *plain_size = 0;
108
109 wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");
110
111 return -1;
112 }
113
114
115 /* get first tlv record in packet matching type
116 * @data (decrypted) packet
117 * @return 0 on success else -1
118 */
wpa_ft_rrb_get_tlv(const u8 * plain,size_t plain_len,u16 type,size_t * tlv_len,const u8 ** tlv_data)119 static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
120 u16 type, size_t *tlv_len, const u8 **tlv_data)
121 {
122 const struct ft_rrb_tlv *f;
123 size_t left;
124 le16 type16;
125 size_t len;
126
127 left = plain_len;
128 type16 = host_to_le16(type);
129
130 while (left >= sizeof(*f)) {
131 f = (const struct ft_rrb_tlv *) plain;
132
133 left -= sizeof(*f);
134 plain += sizeof(*f);
135 len = le_to_host16(f->len);
136
137 if (left < len) {
138 wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
139 break;
140 }
141
142 if (f->type == type16) {
143 *tlv_len = len;
144 *tlv_data = plain;
145 return 0;
146 }
147
148 left -= len;
149 plain += len;
150 }
151
152 return -1;
153 }
154
155
wpa_ft_rrb_dump(const u8 * plain,const size_t plain_len)156 static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
157 {
158 const struct ft_rrb_tlv *f;
159 size_t left;
160 size_t len;
161
162 left = plain_len;
163
164 wpa_printf(MSG_DEBUG, "FT: RRB dump message");
165 while (left >= sizeof(*f)) {
166 f = (const struct ft_rrb_tlv *) plain;
167
168 left -= sizeof(*f);
169 plain += sizeof(*f);
170 len = le_to_host16(f->len);
171
172 wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
173 le_to_host16(f->type), len);
174
175 if (left < len) {
176 wpa_printf(MSG_DEBUG,
177 "FT: RRB message truncated: left %zu bytes, need %zu",
178 left, len);
179 break;
180 }
181
182 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);
183
184 left -= len;
185 plain += len;
186 }
187
188 if (left > 0)
189 wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);
190
191 wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
192 }
193
194
wpa_ft_tlv_len(const struct tlv_list * tlvs)195 static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
196 {
197 size_t tlv_len = 0;
198 int i;
199
200 if (!tlvs)
201 return 0;
202
203 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
204 tlv_len += sizeof(struct ft_rrb_tlv);
205 tlv_len += tlvs[i].len;
206 }
207
208 return tlv_len;
209 }
210
211
wpa_ft_tlv_lin(const struct tlv_list * tlvs,u8 * start,u8 * endpos)212 static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
213 u8 *endpos)
214 {
215 int i;
216 size_t tlv_len;
217 struct ft_rrb_tlv *hdr;
218 u8 *pos;
219
220 if (!tlvs)
221 return 0;
222
223 tlv_len = 0;
224 pos = start;
225 for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
226 if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
227 return tlv_len;
228 tlv_len += sizeof(*hdr);
229 hdr = (struct ft_rrb_tlv *) pos;
230 hdr->type = host_to_le16(tlvs[i].type);
231 hdr->len = host_to_le16(tlvs[i].len);
232 pos = start + tlv_len;
233
234 if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
235 return tlv_len;
236 tlv_len += tlvs[i].len;
237 os_memcpy(pos, tlvs[i].data, tlvs[i].len);
238 pos = start + tlv_len;
239 }
240
241 return tlv_len;
242 }
243
244
wpa_ft_rrb_lin(const struct tlv_list * tlvs1,const struct tlv_list * tlvs2,u8 ** plain,size_t * plain_len)245 static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
246 const struct tlv_list *tlvs2,
247 u8 **plain, size_t *plain_len)
248 {
249 u8 *pos, *endpos;
250 size_t tlv_len;
251
252 tlv_len = wpa_ft_tlv_len(tlvs1);
253 tlv_len += wpa_ft_tlv_len(tlvs2);
254
255 *plain_len = tlv_len;
256 *plain = os_zalloc(tlv_len);
257 if (!*plain) {
258 wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
259 goto err;
260 }
261
262 pos = *plain;
263 endpos = *plain + tlv_len;
264 pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
265 pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
266
267 /* sanity check */
268 if (pos != endpos) {
269 wpa_printf(MSG_ERROR, "FT: Length error building RRB");
270 goto err;
271 }
272
273 return 0;
274
275 err:
276 os_free(*plain);
277 *plain = NULL;
278 *plain_len = 0;
279 return -1;
280 }
281
282
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)283 static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
284 const u8 *plain, const size_t plain_len,
285 const u8 *auth, const size_t auth_len,
286 const u8 *src_addr, u8 type, u8 *enc)
287 {
288 const u8 *ad[3] = { src_addr, auth, &type };
289 size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
290
291 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
292 plain, plain_len);
293 wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
294
295 if (!key) {
296 /* encryption not needed, return plaintext as packet */
297 os_memcpy(enc, plain, plain_len);
298 } else if (aes_siv_encrypt(key, key_len, plain, plain_len,
299 3, ad, ad_len, enc) < 0) {
300 wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
301 return -1;
302 }
303
304 return 0;
305 }
306
307
308 /**
309 * wpa_ft_rrb_build - Build and encrypt an FT RRB message
310 * @key: AES-SIV key for AEAD
311 * @key_len: Length of key in octets
312 * @tlvs_enc0: First set of to-be-encrypted TLVs
313 * @tlvs_enc1: Second set of to-be-encrypted TLVs
314 * @tlvs_auth: Set of to-be-authenticated TLVs
315 * @src_addr: MAC address of the frame sender
316 * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
317 * @packet Pointer to return the pointer to the allocated packet buffer;
318 * needs to be freed by the caller if not null;
319 * will only be returned on success
320 * @packet_len: Pointer to return the length of the allocated buffer in octets
321 * Returns: 0 on success, -1 on error
322 */
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 u8 * src_addr,u8 type,u8 ** packet,size_t * packet_len)323 static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
324 const struct tlv_list *tlvs_enc0,
325 const struct tlv_list *tlvs_enc1,
326 const struct tlv_list *tlvs_auth,
327 const u8 *src_addr, u8 type,
328 u8 **packet, size_t *packet_len)
329 {
330 u8 *plain = NULL, *auth = NULL, *pos;
331 size_t plain_len = 0, auth_len = 0;
332 int ret = -1;
333
334 if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, &plain, &plain_len) < 0)
335 goto out;
336
337 if (wpa_ft_rrb_lin(tlvs_auth, NULL, &auth, &auth_len) < 0)
338 goto out;
339
340 *packet_len = sizeof(u16) + auth_len + plain_len;
341 if (key)
342 *packet_len += AES_BLOCK_SIZE;
343 *packet = os_zalloc(*packet_len);
344 if (!*packet)
345 goto out;
346
347 pos = *packet;
348 WPA_PUT_LE16(pos, auth_len);
349 pos += 2;
350 os_memcpy(pos, auth, auth_len);
351 pos += auth_len;
352 if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
353 auth_len, src_addr, type, pos) < 0)
354 goto out;
355
356 ret = 0;
357
358 out:
359 bin_clear_free(plain, plain_len);
360 os_free(auth);
361
362 if (ret) {
363 wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
364 os_free(*packet);
365 *packet = NULL;
366 *packet_len = 0;
367 }
368
369 return ret;
370 }
371
372
373 #define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
374 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
375 &f_##field##_len, &f_##field) < 0 || \
376 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
377 wpa_printf(MSG_INFO, "FT: Missing required " #field \
378 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
379 wpa_ft_rrb_dump(srcfield, srcfield##_len); \
380 goto out; \
381 } \
382 } while (0)
383
384 #define RRB_GET(type, field, txt, checklength) \
385 RRB_GET_SRC(plain, type, field, txt, checklength)
386 #define RRB_GET_AUTH(type, field, txt, checklength) \
387 RRB_GET_SRC(auth, type, field, txt, checklength)
388
389 #define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
390 if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
391 &f_##field##_len, &f_##field) < 0 || \
392 (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
393 wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
394 " in %s from " MACSTR, txt, MAC2STR(src_addr)); \
395 f_##field##_len = 0; \
396 f_##field = NULL; \
397 } \
398 } while (0)
399
400 #define RRB_GET_OPTIONAL(type, field, txt, checklength) \
401 RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
402 #define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
403 RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)
404
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)405 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
406 const u8 *data, size_t data_len)
407 {
408 if (wpa_auth->cb->send_ether == NULL)
409 return -1;
410 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
411 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
412 data, data_len);
413 }
414
415
wpa_ft_rrb_oui_send(struct wpa_authenticator * wpa_auth,const u8 * dst,u8 oui_suffix,const u8 * data,size_t data_len)416 static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
417 const u8 *dst, u8 oui_suffix,
418 const u8 *data, size_t data_len)
419 {
420 if (!wpa_auth->cb->send_oui)
421 return -1;
422 wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR,
423 oui_suffix, MAC2STR(dst));
424 return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data,
425 data_len);
426 }
427
428
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)429 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
430 const u8 *dst, const u8 *data, size_t data_len)
431 {
432 if (wpa_auth->cb->send_ft_action == NULL)
433 return -1;
434 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
435 data, data_len);
436 }
437
438
wpa_ft_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)439 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
440 const u8 *addr, const u8 *p2p_dev_addr,
441 const u8 *prev_psk)
442 {
443 if (wpa_auth->cb->get_psk == NULL)
444 return NULL;
445 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
446 prev_psk, NULL);
447 }
448
449
450 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)451 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
452 {
453 if (wpa_auth->cb->add_sta == NULL)
454 return NULL;
455 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
456 }
457
458
wpa_ft_add_tspec(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,u8 * tspec_ie,size_t tspec_ielen)459 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
460 const u8 *sta_addr,
461 u8 *tspec_ie, size_t tspec_ielen)
462 {
463 if (wpa_auth->cb->add_tspec == NULL) {
464 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
465 return -1;
466 }
467 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
468 tspec_ielen);
469 }
470
471
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)472 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
473 {
474 u8 *pos = buf;
475 u8 capab;
476 if (len < 2 + sizeof(struct rsn_mdie))
477 return -1;
478
479 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
480 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
481 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
482 pos += MOBILITY_DOMAIN_ID_LEN;
483 capab = 0;
484 if (conf->ft_over_ds)
485 capab |= RSN_FT_CAPAB_FT_OVER_DS;
486 *pos++ = capab;
487
488 return pos - buf;
489 }
490
491
wpa_write_ftie(struct wpa_auth_config * conf,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)492 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
493 size_t r0kh_id_len,
494 const u8 *anonce, const u8 *snonce,
495 u8 *buf, size_t len, const u8 *subelem,
496 size_t subelem_len)
497 {
498 u8 *pos = buf, *ielen;
499 struct rsn_ftie *hdr;
500
501 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
502 subelem_len)
503 return -1;
504
505 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
506 ielen = pos++;
507
508 hdr = (struct rsn_ftie *) pos;
509 os_memset(hdr, 0, sizeof(*hdr));
510 pos += sizeof(*hdr);
511 WPA_PUT_LE16(hdr->mic_control, 0);
512 if (anonce)
513 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
514 if (snonce)
515 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
516
517 /* Optional Parameters */
518 *pos++ = FTIE_SUBELEM_R1KH_ID;
519 *pos++ = FT_R1KH_ID_LEN;
520 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
521 pos += FT_R1KH_ID_LEN;
522
523 if (r0kh_id) {
524 *pos++ = FTIE_SUBELEM_R0KH_ID;
525 *pos++ = r0kh_id_len;
526 os_memcpy(pos, r0kh_id, r0kh_id_len);
527 pos += r0kh_id_len;
528 }
529
530 if (subelem) {
531 os_memcpy(pos, subelem, subelem_len);
532 pos += subelem_len;
533 }
534
535 *ielen = pos - buf - 2;
536
537 return pos - buf;
538 }
539
540
541 /* A packet to be handled after seq response */
542 struct ft_remote_item {
543 struct dl_list list;
544
545 u8 nonce[FT_RRB_NONCE_LEN];
546 struct os_reltime nonce_ts;
547
548 u8 src_addr[ETH_ALEN];
549 u8 *enc;
550 size_t enc_len;
551 u8 *auth;
552 size_t auth_len;
553 int (*cb)(struct wpa_authenticator *wpa_auth,
554 const u8 *src_addr,
555 const u8 *enc, size_t enc_len,
556 const u8 *auth, size_t auth_len,
557 int no_defer);
558 };
559
560
wpa_ft_rrb_seq_free(struct ft_remote_item * item)561 static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
562 {
563 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
564 dl_list_del(&item->list);
565 bin_clear_free(item->enc, item->enc_len);
566 os_free(item->auth);
567 os_free(item);
568 }
569
570
wpa_ft_rrb_seq_flush(struct wpa_authenticator * wpa_auth,struct ft_remote_seq * rkh_seq,int cb)571 static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
572 struct ft_remote_seq *rkh_seq, int cb)
573 {
574 struct ft_remote_item *item, *n;
575
576 dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
577 struct ft_remote_item, list) {
578 if (cb && item->cb)
579 item->cb(wpa_auth, item->src_addr, item->enc,
580 item->enc_len, item->auth, item->auth_len, 1);
581 wpa_ft_rrb_seq_free(item);
582 }
583 }
584
585
wpa_ft_rrb_seq_timeout(void * eloop_ctx,void * timeout_ctx)586 static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
587 {
588 struct ft_remote_item *item = timeout_ctx;
589
590 wpa_ft_rrb_seq_free(item);
591 }
592
593
594 static int
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))595 wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
596 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
597 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
598 const u8 *f_r1kh_id, const u8 *key, size_t key_len,
599 const u8 *enc, size_t enc_len,
600 const u8 *auth, size_t auth_len,
601 int (*cb)(struct wpa_authenticator *wpa_auth,
602 const u8 *src_addr,
603 const u8 *enc, size_t enc_len,
604 const u8 *auth, size_t auth_len,
605 int no_defer))
606 {
607 struct ft_remote_item *item = NULL;
608 u8 *packet = NULL;
609 size_t packet_len;
610 struct tlv_list seq_req_auth[] = {
611 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
612 .data = NULL /* to be filled: item->nonce */ },
613 { .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
614 .data = f_r0kh_id },
615 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
616 .data = f_r1kh_id },
617 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
618 };
619
620 if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
621 wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
622 goto err;
623 }
624
625 item = os_zalloc(sizeof(*item));
626 if (!item)
627 goto err;
628
629 os_memcpy(item->src_addr, src_addr, ETH_ALEN);
630 item->cb = cb;
631
632 if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
633 wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
634 goto err;
635 }
636
637 if (os_get_reltime(&item->nonce_ts) < 0)
638 goto err;
639
640 if (enc && enc_len > 0) {
641 item->enc = os_memdup(enc, enc_len);
642 item->enc_len = enc_len;
643 if (!item->enc)
644 goto err;
645 }
646
647 if (auth && auth_len > 0) {
648 item->auth = os_memdup(auth, auth_len);
649 item->auth_len = auth_len;
650 if (!item->auth)
651 goto err;
652 }
653
654 eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
655 wpa_auth, item);
656
657 seq_req_auth[0].data = item->nonce;
658
659 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth,
660 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
661 &packet, &packet_len) < 0) {
662 item = NULL; /* some other seq resp might still accept this */
663 goto err;
664 }
665
666 dl_list_add(&rkh_seq->rx.queue, &item->list);
667
668 wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
669 packet, packet_len);
670
671 os_free(packet);
672
673 return 0;
674 err:
675 wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
676 if (item) {
677 os_free(item->auth);
678 bin_clear_free(item->enc, item->enc_len);
679 os_free(item);
680 }
681
682 return -1;
683 }
684
685
686 #define FT_RRB_SEQ_OK 0
687 #define FT_RRB_SEQ_DROP 1
688 #define FT_RRB_SEQ_DEFER 2
689
690 static int
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)691 wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
692 const u8 *enc, size_t enc_len,
693 const u8 *auth, size_t auth_len,
694 const char *msgtype, int no_defer)
695 {
696 const u8 *f_seq;
697 size_t f_seq_len;
698 const struct ft_rrb_seq *msg_both;
699 u32 msg_seq, msg_off, rkh_off;
700 struct os_reltime now;
701 unsigned int i;
702
703 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
704 wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
705 msg_both = (const struct ft_rrb_seq *) f_seq;
706
707 if (rkh_seq->rx.num_last == 0) {
708 /* first packet from remote */
709 goto defer;
710 }
711
712 if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
713 /* remote might have rebooted */
714 goto defer;
715 }
716
717 if (os_get_reltime(&now) == 0) {
718 u32 msg_ts_now_remote, msg_ts_off;
719 struct os_reltime now_remote;
720
721 os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
722 msg_ts_now_remote = now_remote.sec;
723 msg_ts_off = le_to_host32(msg_both->ts) -
724 (msg_ts_now_remote - ftRRBseqTimeout);
725 if (msg_ts_off > 2 * ftRRBseqTimeout)
726 goto defer;
727 }
728
729 msg_seq = le_to_host32(msg_both->seq);
730 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
731 msg_off = msg_seq - rkh_off;
732 if (msg_off > 0xC0000000)
733 goto out; /* too old message, drop it */
734
735 if (msg_off <= 0x40000000) {
736 for (i = 0; i < rkh_seq->rx.num_last; i++) {
737 if (rkh_seq->rx.last[i] == msg_seq)
738 goto out; /* duplicate message, drop it */
739 }
740
741 return FT_RRB_SEQ_OK;
742 }
743
744 defer:
745 if (no_defer)
746 goto out;
747
748 wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
749 MACSTR, msgtype, MAC2STR(src_addr));
750
751 return FT_RRB_SEQ_DEFER;
752 out:
753 wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
754 msgtype, MAC2STR(src_addr));
755
756 return FT_RRB_SEQ_DROP;
757 }
758
759
760 static void
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)761 wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
762 struct ft_remote_seq *rkh_seq, const u8 *src_addr,
763 const u8 *auth, size_t auth_len,
764 const char *msgtype)
765 {
766 const u8 *f_seq;
767 size_t f_seq_len;
768 const struct ft_rrb_seq *msg_both;
769 u32 msg_seq, msg_off, min_off, rkh_off;
770 int minidx = 0;
771 unsigned int i;
772
773 RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
774 msg_both = (const struct ft_rrb_seq *) f_seq;
775
776 msg_seq = le_to_host32(msg_both->seq);
777
778 if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
779 rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
780 rkh_seq->rx.num_last++;
781 return;
782 }
783
784 rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
785 for (i = 0; i < rkh_seq->rx.num_last; i++) {
786 msg_off = rkh_seq->rx.last[i] - rkh_off;
787 min_off = rkh_seq->rx.last[minidx] - rkh_off;
788 if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
789 minidx = i;
790 }
791 rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
792 rkh_seq->rx.offsetidx = minidx;
793
794 return;
795 out:
796 /* RRB_GET_AUTH should never fail here as
797 * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
798 wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
799 }
800
801
wpa_ft_new_seq(struct ft_remote_seq * rkh_seq,struct ft_rrb_seq * f_seq)802 static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
803 struct ft_rrb_seq *f_seq)
804 {
805 struct os_reltime now;
806
807 if (os_get_reltime(&now) < 0)
808 return -1;
809
810 if (!rkh_seq->tx.dom) {
811 if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
812 sizeof(rkh_seq->tx.seq))) {
813 wpa_printf(MSG_ERROR,
814 "FT: Failed to get random data for sequence number initialization");
815 rkh_seq->tx.seq = now.usec;
816 }
817 if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
818 sizeof(rkh_seq->tx.dom))) {
819 wpa_printf(MSG_ERROR,
820 "FT: Failed to get random data for sequence number initialization");
821 rkh_seq->tx.dom = now.usec;
822 }
823 rkh_seq->tx.dom |= 1;
824 }
825
826 f_seq->dom = host_to_le32(rkh_seq->tx.dom);
827 f_seq->seq = host_to_le32(rkh_seq->tx.seq);
828 f_seq->ts = host_to_le32(now.sec);
829
830 rkh_seq->tx.seq++;
831
832 return 0;
833 }
834
835
836 struct wpa_ft_pmk_r0_sa {
837 struct wpa_ft_pmk_r0_sa *next;
838 u8 pmk_r0[PMK_LEN];
839 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
840 u8 spa[ETH_ALEN];
841 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
842 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
843 int pmk_r1_pushed;
844 };
845
846 struct wpa_ft_pmk_r1_sa {
847 struct wpa_ft_pmk_r1_sa *next;
848 u8 pmk_r1[PMK_LEN];
849 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
850 u8 spa[ETH_ALEN];
851 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
852 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
853 };
854
855 struct wpa_ft_pmk_cache {
856 struct wpa_ft_pmk_r0_sa *pmk_r0;
857 struct wpa_ft_pmk_r1_sa *pmk_r1;
858 };
859
wpa_ft_pmk_cache_init(void)860 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
861 {
862 struct wpa_ft_pmk_cache *cache;
863
864 cache = os_zalloc(sizeof(*cache));
865
866 return cache;
867 }
868
869
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)870 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
871 {
872 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
873 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
874
875 r0 = cache->pmk_r0;
876 while (r0) {
877 r0prev = r0;
878 r0 = r0->next;
879 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
880 os_free(r0prev);
881 }
882
883 r1 = cache->pmk_r1;
884 while (r1) {
885 r1prev = r1;
886 r1 = r1->next;
887 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
888 os_free(r1prev);
889 }
890
891 os_free(cache);
892 }
893
894
wpa_ft_store_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0,const u8 * pmk_r0_name,int pairwise)895 int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
896 const u8 *spa, const u8 *pmk_r0,
897 const u8 *pmk_r0_name, int pairwise)
898 {
899 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
900 struct wpa_ft_pmk_r0_sa *r0;
901
902 /* TODO: add expiration and limit on number of entries in cache */
903
904 r0 = os_zalloc(sizeof(*r0));
905 if (r0 == NULL)
906 return -1;
907
908 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
909 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
910 os_memcpy(r0->spa, spa, ETH_ALEN);
911 r0->pairwise = pairwise;
912
913 r0->next = cache->pmk_r0;
914 cache->pmk_r0 = r0;
915
916 return 0;
917 }
918
919
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)920 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
921 const u8 *spa, const u8 *pmk_r0_name,
922 const struct wpa_ft_pmk_r0_sa **r0_out)
923 {
924 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
925 struct wpa_ft_pmk_r0_sa *r0;
926
927 r0 = cache->pmk_r0;
928 while (r0) {
929 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
930 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
931 WPA_PMK_NAME_LEN) == 0) {
932 *r0_out = r0;
933 return 0;
934 }
935
936 r0 = r0->next;
937 }
938
939 *r0_out = NULL;
940 return -1;
941 }
942
943
wpa_ft_store_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1,const u8 * pmk_r1_name,int pairwise)944 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
945 const u8 *spa, const u8 *pmk_r1,
946 const u8 *pmk_r1_name, int pairwise)
947 {
948 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
949 struct wpa_ft_pmk_r1_sa *r1;
950
951 /* TODO: add expiration and limit on number of entries in cache */
952
953 r1 = os_zalloc(sizeof(*r1));
954 if (r1 == NULL)
955 return -1;
956
957 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
958 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
959 os_memcpy(r1->spa, spa, ETH_ALEN);
960 r1->pairwise = pairwise;
961
962 r1->next = cache->pmk_r1;
963 cache->pmk_r1 = r1;
964
965 return 0;
966 }
967
968
wpa_ft_fetch_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1_name,u8 * pmk_r1,int * pairwise)969 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
970 const u8 *spa, const u8 *pmk_r1_name,
971 u8 *pmk_r1, int *pairwise)
972 {
973 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
974 struct wpa_ft_pmk_r1_sa *r1;
975
976 r1 = cache->pmk_r1;
977 while (r1) {
978 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
979 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
980 WPA_PMK_NAME_LEN) == 0) {
981 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
982 if (pairwise)
983 *pairwise = r1->pairwise;
984 return 0;
985 }
986
987 r1 = r1->next;
988 }
989
990 return -1;
991 }
992
993
wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh * r0kh)994 static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
995 {
996 if (r0kh->seq)
997 return 0;
998
999 r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
1000 if (!r0kh->seq) {
1001 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
1002 return -1;
1003 }
1004
1005 dl_list_init(&r0kh->seq->rx.queue);
1006
1007 return 0;
1008 }
1009
1010
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)1011 static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
1012 const u8 *f_r0kh_id, size_t f_r0kh_id_len,
1013 struct ft_remote_r0kh **r0kh_out,
1014 struct ft_remote_r0kh **r0kh_wildcard)
1015 {
1016 struct ft_remote_r0kh *r0kh;
1017
1018 *r0kh_wildcard = NULL;
1019 *r0kh_out = NULL;
1020
1021 if (wpa_auth->conf.r0kh_list)
1022 r0kh = *wpa_auth->conf.r0kh_list;
1023 else
1024 r0kh = NULL;
1025 for (; r0kh; r0kh = r0kh->next) {
1026 if (r0kh->id_len == 1 && r0kh->id[0] == '*')
1027 *r0kh_wildcard = r0kh;
1028 if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
1029 os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
1030 *r0kh_out = r0kh;
1031 }
1032
1033 if (!*r0kh_out && !*r0kh_wildcard)
1034 wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");
1035
1036 if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
1037 *r0kh_out = NULL;
1038 }
1039
1040
wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh * r1kh)1041 static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
1042 {
1043 if (r1kh->seq)
1044 return 0;
1045
1046 r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
1047 if (!r1kh->seq) {
1048 wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
1049 return -1;
1050 }
1051
1052 dl_list_init(&r1kh->seq->rx.queue);
1053
1054 return 0;
1055 }
1056
1057
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)1058 static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
1059 const u8 *f_r1kh_id,
1060 struct ft_remote_r1kh **r1kh_out,
1061 struct ft_remote_r1kh **r1kh_wildcard)
1062 {
1063 struct ft_remote_r1kh *r1kh;
1064
1065 *r1kh_wildcard = NULL;
1066 *r1kh_out = NULL;
1067
1068 if (wpa_auth->conf.r1kh_list)
1069 r1kh = *wpa_auth->conf.r1kh_list;
1070 else
1071 r1kh = NULL;
1072 for (; r1kh; r1kh = r1kh->next) {
1073 if (is_zero_ether_addr(r1kh->addr) &&
1074 is_zero_ether_addr(r1kh->id))
1075 *r1kh_wildcard = r1kh;
1076 if (f_r1kh_id &&
1077 os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
1078 *r1kh_out = r1kh;
1079 }
1080
1081 if (!*r1kh_out && !*r1kh_wildcard)
1082 wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");
1083
1084 if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
1085 *r1kh_out = NULL;
1086 }
1087
1088
wpa_ft_rrb_check_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len)1089 static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
1090 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1091 {
1092 if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
1093 os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
1094 f_r0kh_id_len) != 0)
1095 return -1;
1096
1097 return 0;
1098 }
1099
1100
wpa_ft_rrb_check_r1kh(struct wpa_authenticator * wpa_auth,const u8 * f_r1kh_id)1101 static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
1102 const u8 *f_r1kh_id)
1103 {
1104 if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
1105 FT_R1KH_ID_LEN) != 0)
1106 return -1;
1107
1108 return 0;
1109 }
1110
1111
wpa_ft_rrb_del_r0kh(void * eloop_ctx,void * timeout_ctx)1112 static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
1113 {
1114 struct wpa_authenticator *wpa_auth = eloop_ctx;
1115 struct ft_remote_r0kh *r0kh, *prev = NULL;
1116
1117 if (!wpa_auth->conf.r0kh_list)
1118 return;
1119
1120 for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
1121 if (r0kh == timeout_ctx)
1122 break;
1123 prev = r0kh;
1124 }
1125 if (!r0kh)
1126 return;
1127 if (prev)
1128 prev->next = r0kh->next;
1129 else
1130 *wpa_auth->conf.r0kh_list = r0kh->next;
1131 if (r0kh->seq)
1132 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1133 os_free(r0kh->seq);
1134 os_free(r0kh);
1135 }
1136
1137
wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh,int timeout)1138 static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
1139 struct ft_remote_r0kh *r0kh, int timeout)
1140 {
1141 if (timeout > 0)
1142 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1143 wpa_auth, r0kh);
1144 }
1145
1146
wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator * wpa_auth,struct ft_remote_r0kh * r0kh,int timeout)1147 static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
1148 struct ft_remote_r0kh *r0kh, int timeout)
1149 {
1150 eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);
1151
1152 if (timeout > 0)
1153 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1154 wpa_auth, r0kh);
1155 }
1156
1157
1158 static struct ft_remote_r0kh *
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)1159 wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
1160 struct ft_remote_r0kh *r0kh_wildcard,
1161 const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
1162 int timeout)
1163 {
1164 struct ft_remote_r0kh *r0kh;
1165
1166 if (!wpa_auth->conf.r0kh_list)
1167 return NULL;
1168
1169 r0kh = os_zalloc(sizeof(*r0kh));
1170 if (!r0kh)
1171 return NULL;
1172
1173 if (src_addr)
1174 os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));
1175
1176 if (id_len > FT_R0KH_ID_MAX_LEN)
1177 id_len = FT_R0KH_ID_MAX_LEN;
1178 os_memcpy(r0kh->id, r0kh_id, id_len);
1179 r0kh->id_len = id_len;
1180
1181 os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));
1182
1183 r0kh->next = *wpa_auth->conf.r0kh_list;
1184 *wpa_auth->conf.r0kh_list = r0kh;
1185
1186 if (timeout > 0)
1187 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
1188 wpa_auth, r0kh);
1189
1190 if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
1191 return NULL;
1192
1193 return r0kh;
1194 }
1195
1196
wpa_ft_rrb_del_r1kh(void * eloop_ctx,void * timeout_ctx)1197 static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
1198 {
1199 struct wpa_authenticator *wpa_auth = eloop_ctx;
1200 struct ft_remote_r1kh *r1kh, *prev = NULL;
1201
1202 if (!wpa_auth->conf.r1kh_list)
1203 return;
1204
1205 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
1206 if (r1kh == timeout_ctx)
1207 break;
1208 prev = r1kh;
1209 }
1210 if (!r1kh)
1211 return;
1212 if (prev)
1213 prev->next = r1kh->next;
1214 else
1215 *wpa_auth->conf.r1kh_list = r1kh->next;
1216 if (r1kh->seq)
1217 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1218 os_free(r1kh->seq);
1219 os_free(r1kh);
1220 }
1221
1222
wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator * wpa_auth,struct ft_remote_r1kh * r1kh,int timeout)1223 static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
1224 struct ft_remote_r1kh *r1kh, int timeout)
1225 {
1226 if (timeout > 0)
1227 eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1228 wpa_auth, r1kh);
1229 }
1230
1231
1232 static struct ft_remote_r1kh *
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)1233 wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
1234 struct ft_remote_r1kh *r1kh_wildcard,
1235 const u8 *src_addr, const u8 *r1kh_id, int timeout)
1236 {
1237 struct ft_remote_r1kh *r1kh;
1238
1239 if (!wpa_auth->conf.r1kh_list)
1240 return NULL;
1241
1242 r1kh = os_zalloc(sizeof(*r1kh));
1243 if (!r1kh)
1244 return NULL;
1245
1246 os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
1247 os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
1248 os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
1249 r1kh->next = *wpa_auth->conf.r1kh_list;
1250 *wpa_auth->conf.r1kh_list = r1kh;
1251
1252 if (timeout > 0)
1253 eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
1254 wpa_auth, r1kh);
1255
1256 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
1257 return NULL;
1258
1259 return r1kh;
1260 }
1261
1262
wpa_ft_sta_deinit(struct wpa_state_machine * sm)1263 void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
1264 {
1265 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1266 }
1267
1268
wpa_ft_deinit_seq(struct wpa_authenticator * wpa_auth)1269 static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
1270 {
1271 struct ft_remote_r0kh *r0kh;
1272 struct ft_remote_r1kh *r1kh;
1273
1274 eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);
1275
1276 if (wpa_auth->conf.r0kh_list)
1277 r0kh = *wpa_auth->conf.r0kh_list;
1278 else
1279 r0kh = NULL;
1280 for (; r0kh; r0kh = r0kh->next) {
1281 if (!r0kh->seq)
1282 continue;
1283 wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
1284 os_free(r0kh->seq);
1285 r0kh->seq = NULL;
1286 }
1287
1288 if (wpa_auth->conf.r1kh_list)
1289 r1kh = *wpa_auth->conf.r1kh_list;
1290 else
1291 r1kh = NULL;
1292 for (; r1kh; r1kh = r1kh->next) {
1293 if (!r1kh->seq)
1294 continue;
1295 wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
1296 os_free(r1kh->seq);
1297 r1kh->seq = NULL;
1298 }
1299 }
1300
1301
wpa_ft_deinit_rkh_tmp(struct wpa_authenticator * wpa_auth)1302 static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
1303 {
1304 struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
1305 struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;
1306
1307 if (wpa_auth->conf.r0kh_list)
1308 r0kh = *wpa_auth->conf.r0kh_list;
1309 else
1310 r0kh = NULL;
1311 while (r0kh) {
1312 r0kh_next = r0kh->next;
1313 if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
1314 r0kh) > 0) {
1315 if (r0kh_prev)
1316 r0kh_prev->next = r0kh_next;
1317 else
1318 *wpa_auth->conf.r0kh_list = r0kh_next;
1319 os_free(r0kh);
1320 } else {
1321 r0kh_prev = r0kh;
1322 }
1323 r0kh = r0kh_next;
1324 }
1325
1326 if (wpa_auth->conf.r1kh_list)
1327 r1kh = *wpa_auth->conf.r1kh_list;
1328 else
1329 r1kh = NULL;
1330 while (r1kh) {
1331 r1kh_next = r1kh->next;
1332 if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
1333 r1kh) > 0) {
1334 if (r1kh_prev)
1335 r1kh_prev->next = r1kh_next;
1336 else
1337 *wpa_auth->conf.r1kh_list = r1kh_next;
1338 os_free(r1kh);
1339 } else {
1340 r1kh_prev = r1kh;
1341 }
1342 r1kh = r1kh_next;
1343 }
1344 }
1345
1346
wpa_ft_deinit(struct wpa_authenticator * wpa_auth)1347 void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
1348 {
1349 wpa_ft_deinit_seq(wpa_auth);
1350 wpa_ft_deinit_rkh_tmp(wpa_auth);
1351 }
1352
1353
wpa_ft_block_r0kh(struct wpa_authenticator * wpa_auth,const u8 * f_r0kh_id,size_t f_r0kh_id_len)1354 static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
1355 const u8 *f_r0kh_id, size_t f_r0kh_id_len)
1356 {
1357 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1358
1359 if (!wpa_auth->conf.rkh_neg_timeout)
1360 return;
1361
1362 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
1363 &r0kh, &r0kh_wildcard);
1364
1365 if (!r0kh_wildcard) {
1366 /* r0kh removed after neg_timeout and might need re-adding */
1367 return;
1368 }
1369
1370 wpa_hexdump(MSG_DEBUG, "FT: Blacklist R0KH-ID",
1371 f_r0kh_id, f_r0kh_id_len);
1372
1373 if (r0kh) {
1374 wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
1375 wpa_auth->conf.rkh_neg_timeout);
1376 os_memset(r0kh->addr, 0, ETH_ALEN);
1377 } else
1378 wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
1379 f_r0kh_id_len,
1380 wpa_auth->conf.rkh_neg_timeout);
1381 }
1382
1383
wpa_ft_expire_pull(void * eloop_ctx,void * timeout_ctx)1384 static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
1385 {
1386 struct wpa_state_machine *sm = eloop_ctx;
1387
1388 wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
1389 MAC2STR(sm->addr));
1390 if (sm->ft_pending_pull_left_retries <= 0)
1391 wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);
1392
1393 /* cancel multiple timeouts */
1394 eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
1395 ft_finish_pull(sm);
1396 }
1397
1398
wpa_ft_pull_pmk_r1(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * pmk_r0_name)1399 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
1400 const u8 *ies, size_t ies_len,
1401 const u8 *pmk_r0_name)
1402 {
1403 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
1404 u8 *packet = NULL;
1405 const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
1406 size_t packet_len, key_len;
1407 struct ft_rrb_seq f_seq;
1408 int tsecs, tusecs, first;
1409 struct wpabuf *ft_pending_req_ies;
1410 int r0kh_timeout;
1411 struct tlv_list req_enc[] = {
1412 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
1413 .data = pmk_r0_name },
1414 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
1415 .data = sm->addr },
1416 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1417 };
1418 struct tlv_list req_auth[] = {
1419 { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
1420 .data = sm->ft_pending_pull_nonce },
1421 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
1422 .data = (u8 *) &f_seq },
1423 { .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
1424 .data = sm->r0kh_id },
1425 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
1426 .data = f_r1kh_id },
1427 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
1428 };
1429
1430 if (sm->ft_pending_pull_left_retries <= 0)
1431 return -1;
1432 first = sm->ft_pending_pull_left_retries ==
1433 sm->wpa_auth->conf.rkh_pull_retries;
1434 sm->ft_pending_pull_left_retries--;
1435
1436 wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
1437 &r0kh, &r0kh_wildcard);
1438
1439 /* Keep r0kh sufficiently long in the list for seq num check */
1440 r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
1441 1 + ftRRBseqTimeout;
1442 if (r0kh) {
1443 wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
1444 } else if (r0kh_wildcard) {
1445 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
1446 /* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
1447 r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
1448 r0kh_wildcard->addr,
1449 sm->r0kh_id, sm->r0kh_id_len,
1450 r0kh_timeout);
1451 }
1452 if (r0kh == NULL) {
1453 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
1454 sm->r0kh_id, sm->r0kh_id_len);
1455 return -1;
1456 }
1457 if (is_zero_ether_addr(r0kh->addr)) {
1458 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is blacklisted",
1459 sm->r0kh_id, sm->r0kh_id_len);
1460 return -1;
1461 }
1462
1463 key = r0kh->key;
1464 key_len = sizeof(r0kh->key);
1465
1466 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
1467 "address " MACSTR, MAC2STR(r0kh->addr));
1468
1469 if (r0kh->seq->rx.num_last == 0) {
1470 /* A sequence request will be sent out anyway when pull
1471 * response is received. Send it out now to avoid one RTT. */
1472 wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
1473 r0kh->id, r0kh->id_len, f_r1kh_id, key,
1474 key_len, NULL, 0, NULL, 0, NULL);
1475 }
1476
1477 if (first &&
1478 random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
1479 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
1480 "nonce");
1481 return -1;
1482 }
1483
1484 if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
1485 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
1486 return -1;
1487 }
1488
1489 if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth,
1490 sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
1491 &packet, &packet_len) < 0)
1492 return -1;
1493
1494 ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
1495 wpabuf_free(sm->ft_pending_req_ies);
1496 sm->ft_pending_req_ies = ft_pending_req_ies;
1497 if (!sm->ft_pending_req_ies) {
1498 os_free(packet);
1499 return -1;
1500 }
1501
1502 tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
1503 tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
1504 eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);
1505
1506 wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
1507 packet, packet_len);
1508
1509 os_free(packet);
1510
1511 return 0;
1512 }
1513
1514
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk)1515 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
1516 struct wpa_ptk *ptk)
1517 {
1518 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
1519 u8 pmk_r1[PMK_LEN];
1520 u8 ptk_name[WPA_PMK_NAME_LEN];
1521 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
1522 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
1523 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
1524 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
1525 const u8 *ssid = sm->wpa_auth->conf.ssid;
1526 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
1527 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
1528
1529 if (sm->xxkey_len == 0) {
1530 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
1531 "derivation");
1532 return -1;
1533 }
1534
1535 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
1536 r0kh, r0kh_len, sm->addr,
1537 pmk_r0, pmk_r0_name) < 0)
1538 return -1;
1539 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
1540 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
1541 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
1542 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
1543 sm->pairwise);
1544
1545 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
1546 pmk_r1, sm->pmk_r1_name) < 0)
1547 return -1;
1548 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
1549 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
1550 WPA_PMK_NAME_LEN);
1551 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
1552 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1,
1553 sm->pmk_r1_name, sm->pairwise);
1554
1555 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1556 sm->wpa_auth->addr, sm->pmk_r1_name,
1557 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
1558 }
1559
1560
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)1561 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
1562 const u8 *addr, int idx, u8 *seq)
1563 {
1564 if (wpa_auth->cb->get_seqnum == NULL)
1565 return -1;
1566 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
1567 }
1568
1569
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)1570 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
1571 {
1572 u8 *subelem;
1573 struct wpa_group *gsm = sm->group;
1574 size_t subelem_len, pad_len;
1575 const u8 *key;
1576 size_t key_len;
1577 u8 keybuf[32];
1578
1579 key_len = gsm->GTK_len;
1580 if (key_len > sizeof(keybuf))
1581 return NULL;
1582
1583 /*
1584 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
1585 * than 16 bytes.
1586 */
1587 pad_len = key_len % 8;
1588 if (pad_len)
1589 pad_len = 8 - pad_len;
1590 if (key_len + pad_len < 16)
1591 pad_len += 8;
1592 if (pad_len && key_len < sizeof(keybuf)) {
1593 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
1594 os_memset(keybuf + key_len, 0, pad_len);
1595 keybuf[key_len] = 0xdd;
1596 key_len += pad_len;
1597 key = keybuf;
1598 } else
1599 key = gsm->GTK[gsm->GN - 1];
1600
1601 /*
1602 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
1603 * Key[5..32].
1604 */
1605 subelem_len = 13 + key_len + 8;
1606 subelem = os_zalloc(subelem_len);
1607 if (subelem == NULL)
1608 return NULL;
1609
1610 subelem[0] = FTIE_SUBELEM_GTK;
1611 subelem[1] = 11 + key_len + 8;
1612 /* Key ID in B0-B1 of Key Info */
1613 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
1614 subelem[4] = gsm->GTK_len;
1615 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
1616 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key,
1617 subelem + 13)) {
1618 os_free(subelem);
1619 return NULL;
1620 }
1621
1622 *len = subelem_len;
1623 return subelem;
1624 }
1625
1626
1627 #ifdef CONFIG_IEEE80211W
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)1628 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
1629 {
1630 u8 *subelem, *pos;
1631 struct wpa_group *gsm = sm->group;
1632 size_t subelem_len;
1633
1634 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
1635 * Key[16+8] */
1636 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
1637 subelem = os_zalloc(subelem_len);
1638 if (subelem == NULL)
1639 return NULL;
1640
1641 pos = subelem;
1642 *pos++ = FTIE_SUBELEM_IGTK;
1643 *pos++ = subelem_len - 2;
1644 WPA_PUT_LE16(pos, gsm->GN_igtk);
1645 pos += 2;
1646 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
1647 pos += 6;
1648 *pos++ = WPA_IGTK_LEN;
1649 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8,
1650 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
1651 os_free(subelem);
1652 return NULL;
1653 }
1654
1655 *len = subelem_len;
1656 return subelem;
1657 }
1658 #endif /* CONFIG_IEEE80211W */
1659
1660
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)1661 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
1662 u8 *pos, u8 *end, u8 id, u8 descr_count,
1663 const u8 *ies, size_t ies_len)
1664 {
1665 struct ieee802_11_elems parse;
1666 struct rsn_rdie *rdie;
1667
1668 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
1669 id, descr_count);
1670 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
1671 ies, ies_len);
1672
1673 if (end - pos < (int) sizeof(*rdie)) {
1674 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
1675 return pos;
1676 }
1677
1678 *pos++ = WLAN_EID_RIC_DATA;
1679 *pos++ = sizeof(*rdie);
1680 rdie = (struct rsn_rdie *) pos;
1681 rdie->id = id;
1682 rdie->descr_count = 0;
1683 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
1684 pos += sizeof(*rdie);
1685
1686 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
1687 ParseFailed) {
1688 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
1689 rdie->status_code =
1690 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1691 return pos;
1692 }
1693
1694 if (parse.wmm_tspec) {
1695 struct wmm_tspec_element *tspec;
1696
1697 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
1698 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
1699 "(%d)", (int) parse.wmm_tspec_len);
1700 rdie->status_code =
1701 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1702 return pos;
1703 }
1704 if (end - pos < (int) sizeof(*tspec)) {
1705 wpa_printf(MSG_ERROR, "FT: Not enough room for "
1706 "response TSPEC");
1707 rdie->status_code =
1708 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1709 return pos;
1710 }
1711 tspec = (struct wmm_tspec_element *) pos;
1712 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
1713 }
1714
1715 #ifdef NEED_AP_MLME
1716 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
1717 int res;
1718
1719 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
1720 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
1721 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
1722 rdie->status_code =
1723 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
1724 else if (res == WMM_ADDTS_STATUS_REFUSED)
1725 rdie->status_code =
1726 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
1727 else {
1728 /* TSPEC accepted; include updated TSPEC in response */
1729 rdie->descr_count = 1;
1730 pos += sizeof(struct wmm_tspec_element);
1731 }
1732 return pos;
1733 }
1734 #endif /* NEED_AP_MLME */
1735
1736 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
1737 int res;
1738
1739 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
1740 sizeof(struct wmm_tspec_element));
1741 if (res >= 0) {
1742 if (res)
1743 rdie->status_code = host_to_le16(res);
1744 else {
1745 /* TSPEC accepted; include updated TSPEC in
1746 * response */
1747 rdie->descr_count = 1;
1748 pos += sizeof(struct wmm_tspec_element);
1749 }
1750 return pos;
1751 }
1752 }
1753
1754 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
1755 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
1756 return pos;
1757 }
1758
1759
wpa_ft_process_ric(struct wpa_state_machine * sm,u8 * pos,u8 * end,const u8 * ric,size_t ric_len)1760 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
1761 const u8 *ric, size_t ric_len)
1762 {
1763 const u8 *rpos, *start;
1764 const struct rsn_rdie *rdie;
1765
1766 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
1767
1768 rpos = ric;
1769 while (rpos + sizeof(*rdie) < ric + ric_len) {
1770 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
1771 rpos + 2 + rpos[1] > ric + ric_len)
1772 break;
1773 rdie = (const struct rsn_rdie *) (rpos + 2);
1774 rpos += 2 + rpos[1];
1775 start = rpos;
1776
1777 while (rpos + 2 <= ric + ric_len &&
1778 rpos + 2 + rpos[1] <= ric + ric_len) {
1779 if (rpos[0] == WLAN_EID_RIC_DATA)
1780 break;
1781 rpos += 2 + rpos[1];
1782 }
1783 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
1784 rdie->descr_count,
1785 start, rpos - start);
1786 }
1787
1788 return pos;
1789 }
1790
1791
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)1792 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
1793 size_t max_len, int auth_alg,
1794 const u8 *req_ies, size_t req_ies_len)
1795 {
1796 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
1797 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
1798 int res;
1799 struct wpa_auth_config *conf;
1800 struct rsn_ftie *_ftie;
1801 struct wpa_ft_ies parse;
1802 u8 *ric_start;
1803 u8 *anonce, *snonce;
1804
1805 if (sm == NULL)
1806 return pos;
1807
1808 conf = &sm->wpa_auth->conf;
1809
1810 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1811 return pos;
1812
1813 end = pos + max_len;
1814
1815 if (auth_alg == WLAN_AUTH_FT) {
1816 /*
1817 * RSN (only present if this is a Reassociation Response and
1818 * part of a fast BSS transition)
1819 */
1820 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
1821 if (res < 0)
1822 return pos;
1823 rsnie = pos;
1824 rsnie_len = res;
1825 pos += res;
1826 }
1827
1828 /* Mobility Domain Information */
1829 res = wpa_write_mdie(conf, pos, end - pos);
1830 if (res < 0)
1831 return pos;
1832 mdie = pos;
1833 mdie_len = res;
1834 pos += res;
1835
1836 /* Fast BSS Transition Information */
1837 if (auth_alg == WLAN_AUTH_FT) {
1838 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
1839 r0kh_id = sm->r0kh_id;
1840 r0kh_id_len = sm->r0kh_id_len;
1841 anonce = sm->ANonce;
1842 snonce = sm->SNonce;
1843 #ifdef CONFIG_IEEE80211W
1844 if (sm->mgmt_frame_prot) {
1845 u8 *igtk;
1846 size_t igtk_len;
1847 u8 *nbuf;
1848 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
1849 if (igtk == NULL) {
1850 os_free(subelem);
1851 return pos;
1852 }
1853 nbuf = os_realloc(subelem, subelem_len + igtk_len);
1854 if (nbuf == NULL) {
1855 os_free(subelem);
1856 os_free(igtk);
1857 return pos;
1858 }
1859 subelem = nbuf;
1860 os_memcpy(subelem + subelem_len, igtk, igtk_len);
1861 subelem_len += igtk_len;
1862 os_free(igtk);
1863 }
1864 #endif /* CONFIG_IEEE80211W */
1865 } else {
1866 r0kh_id = conf->r0_key_holder;
1867 r0kh_id_len = conf->r0_key_holder_len;
1868 anonce = NULL;
1869 snonce = NULL;
1870 }
1871 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
1872 end - pos, subelem, subelem_len);
1873 os_free(subelem);
1874 if (res < 0)
1875 return pos;
1876 ftie = pos;
1877 ftie_len = res;
1878 pos += res;
1879
1880 _ftie = (struct rsn_ftie *) (ftie + 2);
1881 if (auth_alg == WLAN_AUTH_FT)
1882 _ftie->mic_control[1] = 3; /* Information element count */
1883
1884 ric_start = pos;
1885 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
1886 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
1887 parse.ric_len);
1888 if (auth_alg == WLAN_AUTH_FT)
1889 _ftie->mic_control[1] +=
1890 ieee802_11_ie_count(ric_start,
1891 pos - ric_start);
1892 }
1893 if (ric_start == pos)
1894 ric_start = NULL;
1895
1896 if (auth_alg == WLAN_AUTH_FT &&
1897 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1898 sm->wpa_auth->addr, 6,
1899 mdie, mdie_len, ftie, ftie_len,
1900 rsnie, rsnie_len,
1901 ric_start, ric_start ? pos - ric_start : 0,
1902 _ftie->mic) < 0)
1903 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1904
1905 os_free(sm->assoc_resp_ftie);
1906 sm->assoc_resp_ftie = os_malloc(ftie_len);
1907 if (sm->assoc_resp_ftie)
1908 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
1909
1910 return pos;
1911 }
1912
1913
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)1914 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
1915 int vlan_id,
1916 enum wpa_alg alg, const u8 *addr, int idx,
1917 u8 *key, size_t key_len)
1918 {
1919 if (wpa_auth->cb->set_key == NULL)
1920 return -1;
1921 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
1922 key, key_len);
1923 }
1924
1925
wpa_ft_install_ptk(struct wpa_state_machine * sm)1926 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
1927 {
1928 enum wpa_alg alg;
1929 int klen;
1930
1931 /* MLME-SETKEYS.request(PTK) */
1932 alg = wpa_cipher_to_alg(sm->pairwise);
1933 klen = wpa_cipher_key_len(sm->pairwise);
1934 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
1935 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
1936 "PTK configuration", sm->pairwise);
1937 return;
1938 }
1939
1940 if (sm->tk_already_set) {
1941 /* Must avoid TK reconfiguration to prevent clearing of TX/RX
1942 * PN in the driver */
1943 wpa_printf(MSG_DEBUG,
1944 "FT: Do not re-install same PTK to the driver");
1945 return;
1946 }
1947
1948 /* FIX: add STA entry to kernel/driver here? The set_key will fail
1949 * most likely without this.. At the moment, STA entry is added only
1950 * after association has been completed. This function will be called
1951 * again after association to get the PTK configured, but that could be
1952 * optimized by adding the STA entry earlier.
1953 */
1954 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
1955 sm->PTK.tk, klen))
1956 return;
1957
1958 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
1959 sm->pairwise_set = TRUE;
1960 sm->tk_already_set = TRUE;
1961 }
1962
1963
1964 /* 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)1965 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
1966 const u8 *req_pmk_r1_name,
1967 u8 *out_pmk_r1, int *out_pairwise)
1968 {
1969 const u8 *pmk = NULL;
1970 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
1971 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
1972 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1973 const u8 *mdid = wpa_auth->conf.mobility_domain;
1974 const u8 *r0kh = sm->r0kh_id;
1975 size_t r0kh_len = sm->r0kh_id_len;
1976 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
1977 const u8 *ssid = wpa_auth->conf.ssid;
1978 size_t ssid_len = wpa_auth->conf.ssid_len;
1979 int pairwise;
1980
1981 pairwise = sm->pairwise;
1982
1983 for (;;) {
1984 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
1985 pmk);
1986 if (pmk == NULL)
1987 break;
1988
1989 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
1990 r0kh_len, sm->addr,
1991 pmk_r0, pmk_r0_name) < 0 ||
1992 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
1993 pmk_r1, pmk_r1_name) < 0 ||
1994 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
1995 WPA_PMK_NAME_LEN) != 0)
1996 continue;
1997
1998 /* We found a PSK that matches the requested pmk_r1_name */
1999 wpa_printf(MSG_DEBUG,
2000 "FT: Found PSK to generate PMK-R1 locally");
2001 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
2002 if (out_pairwise)
2003 *out_pairwise = pairwise;
2004 return 0;
2005 }
2006
2007 wpa_printf(MSG_DEBUG,
2008 "FT: Did not find PSK to generate PMK-R1 locally");
2009 return -1;
2010 }
2011
2012
2013 /* Detect the configuration the station asked for.
2014 * Required to detect FT-PSK and pairwise cipher.
2015 */
wpa_ft_set_key_mgmt(struct wpa_state_machine * sm,struct wpa_ft_ies * parse)2016 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
2017 struct wpa_ft_ies *parse)
2018 {
2019 int key_mgmt, ciphers;
2020
2021 if (sm->wpa_key_mgmt)
2022 return 0;
2023
2024 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
2025 if (!key_mgmt) {
2026 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
2027 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
2028 return -1;
2029 }
2030 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
2031 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
2032 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
2033 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
2034 #ifdef CONFIG_FILS
2035 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
2036 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
2037 else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
2038 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
2039 #endif /* CONFIG_FILS */
2040 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
2041 if (!ciphers) {
2042 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
2043 MACSTR,
2044 parse->pairwise_cipher, MAC2STR(sm->addr));
2045 return -1;
2046 }
2047 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
2048
2049 return 0;
2050 }
2051
2052
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)2053 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
2054 const u8 *ies, size_t ies_len,
2055 u8 **resp_ies, size_t *resp_ies_len)
2056 {
2057 struct rsn_mdie *mdie;
2058 struct rsn_ftie *ftie;
2059 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
2060 u8 ptk_name[WPA_PMK_NAME_LEN];
2061 struct wpa_auth_config *conf;
2062 struct wpa_ft_ies parse;
2063 size_t buflen;
2064 int ret;
2065 u8 *pos, *end;
2066 int pairwise;
2067
2068 *resp_ies = NULL;
2069 *resp_ies_len = 0;
2070
2071 sm->pmk_r1_name_valid = 0;
2072 conf = &sm->wpa_auth->conf;
2073
2074 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
2075 ies, ies_len);
2076
2077 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
2078 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
2079 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2080 }
2081
2082 mdie = (struct rsn_mdie *) parse.mdie;
2083 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
2084 os_memcmp(mdie->mobility_domain,
2085 sm->wpa_auth->conf.mobility_domain,
2086 MOBILITY_DOMAIN_ID_LEN) != 0) {
2087 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
2088 return WLAN_STATUS_INVALID_MDIE;
2089 }
2090
2091 ftie = (struct rsn_ftie *) parse.ftie;
2092 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
2093 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2094 return WLAN_STATUS_INVALID_FTIE;
2095 }
2096
2097 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
2098
2099 if (parse.r0kh_id == NULL) {
2100 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
2101 return WLAN_STATUS_INVALID_FTIE;
2102 }
2103
2104 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
2105 parse.r0kh_id, parse.r0kh_id_len);
2106 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
2107 sm->r0kh_id_len = parse.r0kh_id_len;
2108
2109 if (parse.rsn_pmkid == NULL) {
2110 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
2111 return WLAN_STATUS_INVALID_PMKID;
2112 }
2113
2114 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
2115 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2116
2117 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
2118 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
2119 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
2120 sm->wpa_auth->conf.r1_key_holder, sm->addr,
2121 pmk_r1_name) < 0)
2122 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2123 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
2124 pmk_r1_name, WPA_PMK_NAME_LEN);
2125
2126 if (conf->ft_psk_generate_local &&
2127 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
2128 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0)
2129 return WLAN_STATUS_INVALID_PMKID;
2130 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
2131 pmk_r1, &pairwise) < 0) {
2132 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
2133 wpa_printf(MSG_DEBUG,
2134 "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
2135 return WLAN_STATUS_INVALID_PMKID;
2136 }
2137
2138 return -1; /* Status pending */
2139 }
2140
2141 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
2142 sm->pmk_r1_name_valid = 1;
2143 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
2144
2145 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
2146 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
2147 "ANonce");
2148 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2149 }
2150
2151 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
2152 sm->SNonce, WPA_NONCE_LEN);
2153 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
2154 sm->ANonce, WPA_NONCE_LEN);
2155
2156 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
2157 sm->wpa_auth->addr, pmk_r1_name,
2158 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
2159 pairwise) < 0)
2160 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2161
2162 sm->pairwise = pairwise;
2163 sm->PTK_valid = TRUE;
2164 sm->tk_already_set = FALSE;
2165 wpa_ft_install_ptk(sm);
2166
2167 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
2168 2 + FT_R1KH_ID_LEN + 200;
2169 *resp_ies = os_zalloc(buflen);
2170 if (*resp_ies == NULL)
2171 goto fail;
2172
2173 pos = *resp_ies;
2174 end = *resp_ies + buflen;
2175
2176 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
2177 if (ret < 0)
2178 goto fail;
2179 pos += ret;
2180
2181 ret = wpa_write_mdie(conf, pos, end - pos);
2182 if (ret < 0)
2183 goto fail;
2184 pos += ret;
2185
2186 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
2187 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
2188 if (ret < 0)
2189 goto fail;
2190 pos += ret;
2191
2192 *resp_ies_len = pos - *resp_ies;
2193
2194 return WLAN_STATUS_SUCCESS;
2195 fail:
2196 os_free(*resp_ies);
2197 *resp_ies = NULL;
2198 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2199 }
2200
2201
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)2202 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
2203 u16 auth_transaction, const u8 *ies, size_t ies_len,
2204 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
2205 u16 auth_transaction, u16 status,
2206 const u8 *ies, size_t ies_len),
2207 void *ctx)
2208 {
2209 u16 status;
2210 u8 *resp_ies;
2211 size_t resp_ies_len;
2212 int res;
2213
2214 if (sm == NULL) {
2215 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
2216 "WPA SM not available");
2217 return;
2218 }
2219
2220 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
2221 " BSSID=" MACSTR " transaction=%d",
2222 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
2223 sm->ft_pending_cb = cb;
2224 sm->ft_pending_cb_ctx = ctx;
2225 sm->ft_pending_auth_transaction = auth_transaction;
2226 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
2227 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
2228 &resp_ies_len);
2229 if (res < 0) {
2230 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
2231 return;
2232 }
2233 status = res;
2234
2235 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
2236 " auth_transaction=%d status=%d",
2237 MAC2STR(sm->addr), auth_transaction + 1, status);
2238 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
2239 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
2240 resp_ies, resp_ies_len);
2241 os_free(resp_ies);
2242 }
2243
2244
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)2245 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
2246 size_t ies_len)
2247 {
2248 struct wpa_ft_ies parse;
2249 struct rsn_mdie *mdie;
2250 struct rsn_ftie *ftie;
2251 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
2252 size_t mic_len = 16;
2253 unsigned int count;
2254
2255 if (sm == NULL)
2256 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2257
2258 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
2259
2260 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
2261 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
2262 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2263 }
2264
2265 if (parse.rsn == NULL) {
2266 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
2267 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2268 }
2269
2270 if (parse.rsn_pmkid == NULL) {
2271 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
2272 return WLAN_STATUS_INVALID_PMKID;
2273 }
2274
2275 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
2276 != 0) {
2277 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
2278 "with the PMKR1Name derived from auth request");
2279 return WLAN_STATUS_INVALID_PMKID;
2280 }
2281
2282 mdie = (struct rsn_mdie *) parse.mdie;
2283 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
2284 os_memcmp(mdie->mobility_domain,
2285 sm->wpa_auth->conf.mobility_domain,
2286 MOBILITY_DOMAIN_ID_LEN) != 0) {
2287 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
2288 return WLAN_STATUS_INVALID_MDIE;
2289 }
2290
2291 ftie = (struct rsn_ftie *) parse.ftie;
2292 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
2293 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
2294 return WLAN_STATUS_INVALID_FTIE;
2295 }
2296
2297 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
2298 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
2299 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
2300 ftie->snonce, WPA_NONCE_LEN);
2301 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
2302 sm->SNonce, WPA_NONCE_LEN);
2303 return WLAN_STATUS_INVALID_FTIE;
2304 }
2305
2306 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
2307 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
2308 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
2309 ftie->anonce, WPA_NONCE_LEN);
2310 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
2311 sm->ANonce, WPA_NONCE_LEN);
2312 return WLAN_STATUS_INVALID_FTIE;
2313 }
2314
2315
2316 if (parse.r0kh_id == NULL) {
2317 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
2318 return WLAN_STATUS_INVALID_FTIE;
2319 }
2320
2321 if (parse.r0kh_id_len != sm->r0kh_id_len ||
2322 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
2323 {
2324 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
2325 "the current R0KH-ID");
2326 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
2327 parse.r0kh_id, parse.r0kh_id_len);
2328 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
2329 sm->r0kh_id, sm->r0kh_id_len);
2330 return WLAN_STATUS_INVALID_FTIE;
2331 }
2332
2333 if (parse.r1kh_id == NULL) {
2334 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
2335 return WLAN_STATUS_INVALID_FTIE;
2336 }
2337
2338 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
2339 FT_R1KH_ID_LEN) != 0) {
2340 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
2341 "ReassocReq");
2342 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
2343 parse.r1kh_id, FT_R1KH_ID_LEN);
2344 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
2345 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
2346 return WLAN_STATUS_INVALID_FTIE;
2347 }
2348
2349 if (parse.rsn_pmkid == NULL ||
2350 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
2351 {
2352 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
2353 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
2354 return WLAN_STATUS_INVALID_PMKID;
2355 }
2356
2357 count = 3;
2358 if (parse.ric)
2359 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
2360 if (ftie->mic_control[1] != count) {
2361 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
2362 "Control: received %u expected %u",
2363 ftie->mic_control[1], count);
2364 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2365 }
2366
2367 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
2368 sm->wpa_auth->addr, 5,
2369 parse.mdie - 2, parse.mdie_len + 2,
2370 parse.ftie - 2, parse.ftie_len + 2,
2371 parse.rsn - 2, parse.rsn_len + 2,
2372 parse.ric, parse.ric_len,
2373 mic) < 0) {
2374 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
2375 return WLAN_STATUS_UNSPECIFIED_FAILURE;
2376 }
2377
2378 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
2379 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
2380 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
2381 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
2382 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
2383 ftie->mic, mic_len);
2384 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
2385 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
2386 parse.mdie - 2, parse.mdie_len + 2);
2387 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
2388 parse.ftie - 2, parse.ftie_len + 2);
2389 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
2390 parse.rsn - 2, parse.rsn_len + 2);
2391 return WLAN_STATUS_INVALID_FTIE;
2392 }
2393
2394 return WLAN_STATUS_SUCCESS;
2395 }
2396
2397
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)2398 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
2399 {
2400 const u8 *sta_addr, *target_ap;
2401 const u8 *ies;
2402 size_t ies_len;
2403 u8 action;
2404 struct ft_rrb_frame *frame;
2405
2406 if (sm == NULL)
2407 return -1;
2408
2409 /*
2410 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
2411 * FT Request action frame body[variable]
2412 */
2413
2414 if (len < 14) {
2415 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
2416 "(len=%lu)", (unsigned long) len);
2417 return -1;
2418 }
2419
2420 action = data[1];
2421 sta_addr = data + 2;
2422 target_ap = data + 8;
2423 ies = data + 14;
2424 ies_len = len - 14;
2425
2426 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
2427 " Target AP=" MACSTR " Action=%d)",
2428 MAC2STR(sta_addr), MAC2STR(target_ap), action);
2429
2430 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
2431 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
2432 "STA=" MACSTR " STA-Address=" MACSTR,
2433 MAC2STR(sm->addr), MAC2STR(sta_addr));
2434 return -1;
2435 }
2436
2437 /*
2438 * Do some sanity checking on the target AP address (not own and not
2439 * broadcast. This could be extended to filter based on a list of known
2440 * APs in the MD (if such a list were configured).
2441 */
2442 if ((target_ap[0] & 0x01) ||
2443 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
2444 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
2445 "frame");
2446 return -1;
2447 }
2448
2449 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
2450
2451 if (!sm->wpa_auth->conf.ft_over_ds) {
2452 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
2453 return -1;
2454 }
2455
2456 /* RRB - Forward action frame to the target AP */
2457 frame = os_malloc(sizeof(*frame) + len);
2458 if (frame == NULL)
2459 return -1;
2460 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
2461 frame->packet_type = FT_PACKET_REQUEST;
2462 frame->action_length = host_to_le16(len);
2463 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
2464 os_memcpy(frame + 1, data, len);
2465
2466 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
2467 sizeof(*frame) + len);
2468 os_free(frame);
2469
2470 return 0;
2471 }
2472
2473
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)2474 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
2475 u16 auth_transaction, u16 resp,
2476 const u8 *ies, size_t ies_len)
2477 {
2478 struct wpa_state_machine *sm = ctx;
2479 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
2480 MAC2STR(sm->addr));
2481 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
2482 WLAN_STATUS_SUCCESS, ies, ies_len);
2483 }
2484
2485
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)2486 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
2487 const u8 *current_ap, const u8 *sta_addr,
2488 const u8 *body, size_t len)
2489 {
2490 struct wpa_state_machine *sm;
2491 u16 status;
2492 u8 *resp_ies;
2493 size_t resp_ies_len;
2494 int res;
2495
2496 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
2497 if (sm == NULL) {
2498 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
2499 "RRB Request");
2500 return -1;
2501 }
2502
2503 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
2504
2505 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
2506 sm->ft_pending_cb_ctx = sm;
2507 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
2508 sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
2509 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
2510 &resp_ies_len);
2511 if (res < 0) {
2512 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
2513 return 0;
2514 }
2515 status = res;
2516
2517 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
2518 resp_ies, resp_ies_len);
2519 os_free(resp_ies);
2520 return res;
2521 }
2522
2523
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)2524 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
2525 const u8 *current_ap, const u8 *sta_addr,
2526 u16 status, const u8 *resp_ies,
2527 size_t resp_ies_len)
2528 {
2529 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2530 size_t rlen;
2531 struct ft_rrb_frame *frame;
2532 u8 *pos;
2533
2534 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
2535 " CurrentAP=" MACSTR " status=%d",
2536 MAC2STR(sm->addr), MAC2STR(current_ap), status);
2537 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
2538
2539 /* RRB - Forward action frame response to the Current AP */
2540
2541 /*
2542 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
2543 * Status_Code[2] FT Request action frame body[variable]
2544 */
2545 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
2546
2547 frame = os_malloc(sizeof(*frame) + rlen);
2548 if (frame == NULL)
2549 return -1;
2550 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
2551 frame->packet_type = FT_PACKET_RESPONSE;
2552 frame->action_length = host_to_le16(rlen);
2553 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
2554 pos = (u8 *) (frame + 1);
2555 *pos++ = WLAN_ACTION_FT;
2556 *pos++ = 2; /* Action: Response */
2557 os_memcpy(pos, sta_addr, ETH_ALEN);
2558 pos += ETH_ALEN;
2559 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
2560 pos += ETH_ALEN;
2561 WPA_PUT_LE16(pos, status);
2562 pos += 2;
2563 if (resp_ies)
2564 os_memcpy(pos, resp_ies, resp_ies_len);
2565
2566 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
2567 sizeof(*frame) + rlen);
2568 os_free(frame);
2569
2570 return 0;
2571 }
2572
2573
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)2574 static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
2575 const struct tlv_list *tlvs,
2576 const struct wpa_ft_pmk_r0_sa *pmk_r0,
2577 const u8 *r1kh_id, const u8 *s1kh_id,
2578 const struct tlv_list *tlv_auth,
2579 const u8 *src_addr, u8 type,
2580 u8 **packet, size_t *packet_len)
2581 {
2582 u8 pmk_r1[PMK_LEN];
2583 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
2584 u8 f_pairwise[sizeof(le16)];
2585 int ret;
2586 struct tlv_list sess_tlv[] = {
2587 { .type = FT_RRB_PMK_R1, .len = sizeof(pmk_r1),
2588 .data = pmk_r1 },
2589 { .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
2590 .data = pmk_r1_name },
2591 { .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
2592 .data = f_pairwise },
2593 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
2594 };
2595
2596 if (!pmk_r0)
2597 return wpa_ft_rrb_build(key, key_len, tlvs, NULL, tlv_auth,
2598 src_addr, type, packet, packet_len);
2599
2600 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh_id,
2601 s1kh_id, pmk_r1, pmk_r1_name) < 0)
2602 return -1;
2603 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
2604 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
2605 WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);
2606
2607 ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
2608 src_addr, type, packet, packet_len);
2609
2610 os_memset(pmk_r1, 0, sizeof(pmk_r1));
2611
2612 return ret;
2613 }
2614
2615
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)2616 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
2617 const u8 *src_addr,
2618 const u8 *enc, size_t enc_len,
2619 const u8 *auth, size_t auth_len,
2620 int no_defer)
2621 {
2622 const char *msgtype = "pull request";
2623 u8 *plain = NULL, *packet = NULL;
2624 size_t plain_len = 0, packet_len = 0;
2625 struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
2626 const u8 *key;
2627 size_t key_len;
2628 int seq_ret;
2629 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
2630 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
2631 size_t f_pmk_r0_name_len;
2632 const struct wpa_ft_pmk_r0_sa *r0;
2633 int ret;
2634 struct tlv_list resp[2];
2635 struct tlv_list resp_auth[5];
2636 struct ft_rrb_seq f_seq;
2637
2638 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
2639
2640 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
2641 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
2642
2643 if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
2644 wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
2645 goto out;
2646 }
2647
2648 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
2649 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
2650
2651 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
2652 if (r1kh) {
2653 key = r1kh->key;
2654 key_len = sizeof(r1kh->key);
2655 } else if (r1kh_wildcard) {
2656 wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
2657 key = r1kh_wildcard->key;
2658 key_len = sizeof(r1kh_wildcard->key);
2659 } else {
2660 goto out;
2661 }
2662
2663 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
2664 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
2665
2666 seq_ret = FT_RRB_SEQ_DROP;
2667 if (r1kh)
2668 seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
2669 auth, auth_len, msgtype, no_defer);
2670 if (!no_defer && r1kh_wildcard &&
2671 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
2672 /* wildcard: r1kh-id unknown or changed addr -> do a seq req */
2673 seq_ret = FT_RRB_SEQ_DEFER;
2674 }
2675
2676 if (seq_ret == FT_RRB_SEQ_DROP)
2677 goto out;
2678
2679 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
2680 src_addr, FT_PACKET_R0KH_R1KH_PULL,
2681 &plain, &plain_len) < 0)
2682 goto out;
2683
2684 if (!r1kh)
2685 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
2686 f_r1kh_id,
2687 wpa_auth->conf.rkh_pos_timeout);
2688 if (!r1kh)
2689 goto out;
2690
2691 if (seq_ret == FT_RRB_SEQ_DEFER) {
2692 wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
2693 f_r0kh_id_len, f_r1kh_id, key, key_len,
2694 enc, enc_len, auth, auth_len,
2695 &wpa_ft_rrb_rx_pull);
2696 goto out;
2697 }
2698
2699 wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
2700 msgtype);
2701 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
2702 wpa_auth->conf.rkh_pos_timeout);
2703
2704 RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
2705 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
2706 f_pmk_r0_name_len);
2707
2708 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
2709 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
2710
2711 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
2712 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
2713 goto out;
2714 }
2715
2716 resp[0].type = FT_RRB_S1KH_ID;
2717 resp[0].len = f_s1kh_id_len;
2718 resp[0].data = f_s1kh_id;
2719 resp[1].type = FT_RRB_LAST_EMPTY;
2720 resp[1].len = 0;
2721 resp[1].data = NULL;
2722
2723 resp_auth[0].type = FT_RRB_NONCE;
2724 resp_auth[0].len = f_nonce_len;
2725 resp_auth[0].data = f_nonce;
2726 resp_auth[1].type = FT_RRB_SEQ;
2727 resp_auth[1].len = sizeof(f_seq);
2728 resp_auth[1].data = (u8 *) &f_seq;
2729 resp_auth[2].type = FT_RRB_R0KH_ID;
2730 resp_auth[2].len = f_r0kh_id_len;
2731 resp_auth[2].data = f_r0kh_id;
2732 resp_auth[3].type = FT_RRB_R1KH_ID;
2733 resp_auth[3].len = f_r1kh_id_len;
2734 resp_auth[3].data = f_r1kh_id;
2735 resp_auth[4].type = FT_RRB_LAST_EMPTY;
2736 resp_auth[4].len = 0;
2737 resp_auth[4].data = NULL;
2738
2739 if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0)
2740 wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
2741
2742 ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id, f_s1kh_id,
2743 resp_auth, wpa_auth->addr,
2744 FT_PACKET_R0KH_R1KH_RESP,
2745 &packet, &packet_len);
2746
2747 if (!ret)
2748 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
2749 FT_PACKET_R0KH_R1KH_RESP, packet,
2750 packet_len);
2751
2752 out:
2753 os_free(plain);
2754 os_free(packet);
2755
2756 return 0;
2757 }
2758
2759
2760 /* @returns 0 on success
2761 * -1 on error
2762 * -2 if FR_RRB_PAIRWISE is missing
2763 */
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))2764 static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
2765 const u8 *src_addr, u8 type,
2766 const u8 *enc, size_t enc_len,
2767 const u8 *auth, size_t auth_len,
2768 const char *msgtype, u8 *s1kh_id_out,
2769 int (*cb)(struct wpa_authenticator *wpa_auth,
2770 const u8 *src_addr,
2771 const u8 *enc, size_t enc_len,
2772 const u8 *auth, size_t auth_len,
2773 int no_defer))
2774 {
2775 u8 *plain = NULL;
2776 size_t plain_len = 0;
2777 struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
2778 const u8 *key;
2779 size_t key_len;
2780 int seq_ret;
2781 const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
2782 const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
2783 size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
2784 size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
2785 int pairwise;
2786 int ret = -1;
2787
2788 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
2789 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
2790
2791 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
2792 wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
2793
2794 if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
2795 wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
2796 goto out;
2797 }
2798
2799 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
2800 &r0kh_wildcard);
2801 if (r0kh) {
2802 key = r0kh->key;
2803 key_len = sizeof(r0kh->key);
2804 } else if (r0kh_wildcard) {
2805 wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
2806 key = r0kh_wildcard->key;
2807 key_len = sizeof(r0kh_wildcard->key);
2808 } else {
2809 goto out;
2810 }
2811
2812 seq_ret = FT_RRB_SEQ_DROP;
2813 if (r0kh) {
2814 seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
2815 auth, auth_len, msgtype,
2816 cb ? 0 : 1);
2817 }
2818 if (cb && r0kh_wildcard &&
2819 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
2820 /* wildcard: r0kh-id unknown or changed addr -> do a seq req */
2821 seq_ret = FT_RRB_SEQ_DEFER;
2822 }
2823
2824 if (seq_ret == FT_RRB_SEQ_DROP)
2825 goto out;
2826
2827 if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
2828 src_addr, type, &plain, &plain_len) < 0)
2829 goto out;
2830
2831 if (!r0kh)
2832 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
2833 f_r0kh_id, f_r0kh_id_len,
2834 wpa_auth->conf.rkh_pos_timeout);
2835 if (!r0kh)
2836 goto out;
2837
2838 if (seq_ret == FT_RRB_SEQ_DEFER) {
2839 wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
2840 f_r0kh_id_len, f_r1kh_id, key, key_len,
2841 enc, enc_len, auth, auth_len, cb);
2842 goto out;
2843 }
2844
2845 wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
2846 msgtype);
2847 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
2848 wpa_auth->conf.rkh_pos_timeout);
2849
2850 RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
2851 wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
2852
2853 if (s1kh_id_out)
2854 os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);
2855
2856 ret = -2;
2857 RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
2858 wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);
2859
2860 ret = -1;
2861 RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
2862 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
2863 f_pmk_r1_name, WPA_PMK_NAME_LEN);
2864
2865 RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, PMK_LEN);
2866 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, PMK_LEN);
2867
2868 pairwise = WPA_GET_LE16(f_pairwise);
2869
2870 if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, f_pmk_r1_name,
2871 pairwise) < 0)
2872 goto out;
2873
2874 ret = 0;
2875 out:
2876 if (plain) {
2877 os_memset(plain, 0, plain_len);
2878 os_free(plain);
2879 }
2880
2881 return ret;
2882
2883 }
2884
2885
ft_finish_pull(struct wpa_state_machine * sm)2886 static void ft_finish_pull(struct wpa_state_machine *sm)
2887 {
2888 int res;
2889 u8 *resp_ies;
2890 size_t resp_ies_len;
2891 u16 status;
2892
2893 if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
2894 return;
2895
2896 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
2897 wpabuf_len(sm->ft_pending_req_ies),
2898 &resp_ies, &resp_ies_len);
2899 if (res < 0) {
2900 /* this loop is broken by ft_pending_pull_left_retries */
2901 wpa_printf(MSG_DEBUG,
2902 "FT: Callback postponed until response is available");
2903 return;
2904 }
2905 wpabuf_free(sm->ft_pending_req_ies);
2906 sm->ft_pending_req_ies = NULL;
2907 status = res;
2908 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
2909 " - status %u", MAC2STR(sm->addr), status);
2910
2911 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
2912 sm->ft_pending_auth_transaction + 1, status,
2913 resp_ies, resp_ies_len);
2914 os_free(resp_ies);
2915 }
2916
2917
2918 struct ft_get_sta_ctx {
2919 const u8 *nonce;
2920 const u8 *s1kh_id;
2921 struct wpa_state_machine *sm;
2922 };
2923
2924
ft_get_sta_cb(struct wpa_state_machine * sm,void * ctx)2925 static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
2926 {
2927 struct ft_get_sta_ctx *info = ctx;
2928
2929 if ((info->s1kh_id &&
2930 os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) ||
2931 os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
2932 FT_RRB_NONCE_LEN) != 0 ||
2933 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
2934 return 0;
2935
2936 info->sm = sm;
2937
2938 return 1;
2939 }
2940
2941
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)2942 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
2943 const u8 *src_addr,
2944 const u8 *enc, size_t enc_len,
2945 const u8 *auth, size_t auth_len,
2946 int no_defer)
2947 {
2948 const char *msgtype = "pull response";
2949 int nak, ret = -1;
2950 struct ft_get_sta_ctx ctx;
2951 u8 s1kh_id[ETH_ALEN];
2952 const u8 *f_nonce;
2953 size_t f_nonce_len;
2954
2955 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
2956
2957 RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
2958 wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
2959
2960 os_memset(&ctx, 0, sizeof(ctx));
2961 ctx.nonce = f_nonce;
2962 if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
2963 /* nonce not found */
2964 wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
2965 return -1;
2966 }
2967
2968 ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
2969 enc, enc_len, auth, auth_len, msgtype, s1kh_id,
2970 no_defer ? NULL : &wpa_ft_rrb_rx_resp);
2971 if (ret == -2) {
2972 ret = 0;
2973 nak = 1;
2974 } else {
2975 nak = 0;
2976 }
2977 if (ret < 0)
2978 return -1;
2979
2980 ctx.s1kh_id = s1kh_id;
2981 if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
2982 wpa_printf(MSG_DEBUG,
2983 "FT: Response to a pending pull request for " MACSTR,
2984 MAC2STR(ctx.sm->addr));
2985 eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
2986 if (nak)
2987 ctx.sm->ft_pending_pull_left_retries = 0;
2988 ft_finish_pull(ctx.sm);
2989 }
2990
2991 out:
2992 return ret;
2993 }
2994
2995
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)2996 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
2997 const u8 *src_addr,
2998 const u8 *enc, size_t enc_len,
2999 const u8 *auth, size_t auth_len, int no_defer)
3000 {
3001 const char *msgtype = "push";
3002
3003 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
3004
3005 if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
3006 enc, enc_len, auth, auth_len, msgtype, NULL,
3007 no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
3008 return -1;
3009
3010 return 0;
3011 }
3012
3013
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)3014 static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
3015 const u8 *src_addr, int type,
3016 const u8 *enc, size_t enc_len,
3017 const u8 *auth, size_t auth_len,
3018 struct ft_remote_seq **rkh_seq,
3019 u8 **key, size_t *key_len,
3020 struct ft_remote_r0kh **r0kh_out,
3021 struct ft_remote_r1kh **r1kh_out,
3022 struct ft_remote_r0kh **r0kh_wildcard_out,
3023 struct ft_remote_r1kh **r1kh_wildcard_out)
3024 {
3025 struct ft_remote_r0kh *r0kh = NULL;
3026 struct ft_remote_r1kh *r1kh = NULL;
3027 const u8 *f_r0kh_id, *f_r1kh_id;
3028 size_t f_r0kh_id_len, f_r1kh_id_len;
3029 int to_r0kh, to_r1kh;
3030 u8 *plain = NULL;
3031 size_t plain_len = 0;
3032 struct ft_remote_r0kh *r0kh_wildcard;
3033 struct ft_remote_r1kh *r1kh_wildcard;
3034
3035 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
3036 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
3037
3038 to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
3039 to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);
3040
3041 if (to_r0kh && to_r1kh) {
3042 wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
3043 goto out;
3044 }
3045
3046 if (!to_r0kh && !to_r1kh) {
3047 wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
3048 goto out;
3049 }
3050
3051 if (!to_r0kh) {
3052 wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
3053 &r0kh, &r0kh_wildcard);
3054 if (!r0kh_wildcard &&
3055 (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
3056 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
3057 f_r0kh_id, f_r0kh_id_len);
3058 goto out;
3059 }
3060 if (r0kh) {
3061 *key = r0kh->key;
3062 *key_len = sizeof(r0kh->key);
3063 } else {
3064 *key = r0kh_wildcard->key;
3065 *key_len = sizeof(r0kh_wildcard->key);
3066 }
3067 }
3068
3069 if (!to_r1kh) {
3070 wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
3071 &r1kh_wildcard);
3072 if (!r1kh_wildcard &&
3073 (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
3074 wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
3075 f_r1kh_id, FT_R1KH_ID_LEN);
3076 goto out;
3077 }
3078 if (r1kh) {
3079 *key = r1kh->key;
3080 *key_len = sizeof(r1kh->key);
3081 } else {
3082 *key = r1kh_wildcard->key;
3083 *key_len = sizeof(r1kh_wildcard->key);
3084 }
3085 }
3086
3087 if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
3088 src_addr, type, &plain, &plain_len) < 0)
3089 goto out;
3090
3091 os_free(plain);
3092
3093 if (!to_r0kh) {
3094 if (!r0kh)
3095 r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
3096 src_addr, f_r0kh_id,
3097 f_r0kh_id_len,
3098 ftRRBseqTimeout);
3099 if (!r0kh)
3100 goto out;
3101
3102 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
3103 *rkh_seq = r0kh->seq;
3104 if (r0kh_out)
3105 *r0kh_out = r0kh;
3106 if (r0kh_wildcard_out)
3107 *r0kh_wildcard_out = r0kh_wildcard;
3108 }
3109
3110 if (!to_r1kh) {
3111 if (!r1kh)
3112 r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
3113 src_addr, f_r1kh_id,
3114 ftRRBseqTimeout);
3115 if (!r1kh)
3116 goto out;
3117
3118 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
3119 *rkh_seq = r1kh->seq;
3120 if (r1kh_out)
3121 *r1kh_out = r1kh;
3122 if (r1kh_wildcard_out)
3123 *r1kh_wildcard_out = r1kh_wildcard;
3124 }
3125
3126 return 0;
3127 out:
3128 return -1;
3129 }
3130
3131
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)3132 static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
3133 const u8 *src_addr,
3134 const u8 *enc, size_t enc_len,
3135 const u8 *auth, size_t auth_len,
3136 int no_defer)
3137 {
3138 int ret = -1;
3139 struct ft_rrb_seq f_seq;
3140 const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
3141 size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
3142 struct ft_remote_seq *rkh_seq = NULL;
3143 u8 *packet = NULL, *key = NULL;
3144 size_t packet_len = 0, key_len = 0;
3145 struct tlv_list seq_resp_auth[5];
3146
3147 wpa_printf(MSG_DEBUG, "FT: Received sequence number request");
3148
3149 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
3150 enc, enc_len, auth, auth_len, &rkh_seq, &key,
3151 &key_len, NULL, NULL, NULL, NULL) < 0)
3152 goto out;
3153
3154 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
3155 wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);
3156
3157 RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
3158 RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
3159
3160 if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
3161 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3162 goto out;
3163 }
3164
3165 seq_resp_auth[0].type = FT_RRB_NONCE;
3166 seq_resp_auth[0].len = f_nonce_len;
3167 seq_resp_auth[0].data = f_nonce;
3168 seq_resp_auth[1].type = FT_RRB_SEQ;
3169 seq_resp_auth[1].len = sizeof(f_seq);
3170 seq_resp_auth[1].data = (u8 *) &f_seq;
3171 seq_resp_auth[2].type = FT_RRB_R0KH_ID;
3172 seq_resp_auth[2].len = f_r0kh_id_len;
3173 seq_resp_auth[2].data = f_r0kh_id;
3174 seq_resp_auth[3].type = FT_RRB_R1KH_ID;
3175 seq_resp_auth[3].len = FT_R1KH_ID_LEN;
3176 seq_resp_auth[3].data = f_r1kh_id;
3177 seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
3178 seq_resp_auth[4].len = 0;
3179 seq_resp_auth[4].data = NULL;
3180
3181 if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth,
3182 wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
3183 &packet, &packet_len) < 0)
3184 goto out;
3185
3186 wpa_ft_rrb_oui_send(wpa_auth, src_addr,
3187 FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
3188 packet_len);
3189
3190 out:
3191 os_free(packet);
3192
3193 return ret;
3194 }
3195
3196
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)3197 static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
3198 const u8 *src_addr,
3199 const u8 *enc, size_t enc_len,
3200 const u8 *auth, size_t auth_len,
3201 int no_defer)
3202 {
3203 u8 *key = NULL;
3204 size_t key_len = 0;
3205 struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
3206 struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
3207 const u8 *f_nonce, *f_seq;
3208 size_t f_nonce_len, f_seq_len;
3209 struct ft_remote_seq *rkh_seq = NULL;
3210 struct ft_remote_item *item;
3211 struct os_reltime now, now_remote;
3212 int seq_ret, found;
3213 const struct ft_rrb_seq *msg_both;
3214 u32 msg_dom, msg_seq;
3215
3216 wpa_printf(MSG_DEBUG, "FT: Received sequence number response");
3217
3218 if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
3219 enc, enc_len, auth, auth_len, &rkh_seq, &key,
3220 &key_len, &r0kh, &r1kh, &r0kh_wildcard,
3221 &r1kh_wildcard) < 0)
3222 goto out;
3223
3224 RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
3225 wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
3226 f_nonce_len);
3227
3228 found = 0;
3229 dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
3230 list) {
3231 if (os_memcmp_const(f_nonce, item->nonce,
3232 FT_RRB_NONCE_LEN) != 0 ||
3233 os_get_reltime(&now) < 0 ||
3234 os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
3235 continue;
3236
3237 found = 1;
3238 break;
3239 }
3240 if (!found) {
3241 wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
3242 goto out;
3243 }
3244
3245 if (r0kh) {
3246 wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
3247 wpa_auth->conf.rkh_pos_timeout);
3248 if (r0kh_wildcard)
3249 os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
3250 }
3251
3252 if (r1kh) {
3253 wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
3254 wpa_auth->conf.rkh_pos_timeout);
3255 if (r1kh_wildcard)
3256 os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
3257 }
3258
3259 seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
3260 auth_len, "seq response", 1);
3261 if (seq_ret == FT_RRB_SEQ_OK) {
3262 wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
3263 wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
3264 auth_len, "seq response");
3265 } else {
3266 wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");
3267
3268 RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
3269 sizeof(*msg_both));
3270 msg_both = (const struct ft_rrb_seq *) f_seq;
3271
3272 msg_dom = le_to_host32(msg_both->dom);
3273 msg_seq = le_to_host32(msg_both->seq);
3274 now_remote.sec = le_to_host32(msg_both->ts);
3275 now_remote.usec = 0;
3276
3277 rkh_seq->rx.num_last = 2;
3278 rkh_seq->rx.dom = msg_dom;
3279 rkh_seq->rx.offsetidx = 0;
3280 /* Accept some older, possibly cached packets as well */
3281 rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
3282 dl_list_len(&rkh_seq->rx.queue);
3283 rkh_seq->rx.last[1] = msg_seq;
3284
3285 /* local time - offset = remote time
3286 * <=> local time - remote time = offset */
3287 os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
3288 }
3289
3290 wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);
3291
3292 return 0;
3293 out:
3294 return -1;
3295 }
3296
3297
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)3298 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
3299 const u8 *data, size_t data_len)
3300 {
3301 struct ft_rrb_frame *frame;
3302 u16 alen;
3303 const u8 *pos, *end, *start;
3304 u8 action;
3305 const u8 *sta_addr, *target_ap_addr;
3306
3307 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
3308 MAC2STR(src_addr));
3309
3310 if (data_len < sizeof(*frame)) {
3311 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
3312 (unsigned long) data_len);
3313 return -1;
3314 }
3315
3316 pos = data;
3317 frame = (struct ft_rrb_frame *) pos;
3318 pos += sizeof(*frame);
3319
3320 alen = le_to_host16(frame->action_length);
3321 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
3322 "action_length=%d ap_address=" MACSTR,
3323 frame->frame_type, frame->packet_type, alen,
3324 MAC2STR(frame->ap_address));
3325
3326 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
3327 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
3328 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
3329 "unrecognized type %d", frame->frame_type);
3330 return -1;
3331 }
3332
3333 if (alen > data_len - sizeof(*frame)) {
3334 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
3335 "frame");
3336 return -1;
3337 }
3338
3339 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
3340
3341 if (alen < 1 + 1 + 2 * ETH_ALEN) {
3342 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
3343 "room for Action Frame body); alen=%lu",
3344 (unsigned long) alen);
3345 return -1;
3346 }
3347 start = pos;
3348 end = pos + alen;
3349
3350 if (*pos != WLAN_ACTION_FT) {
3351 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
3352 "%d", *pos);
3353 return -1;
3354 }
3355
3356 pos++;
3357 action = *pos++;
3358 sta_addr = pos;
3359 pos += ETH_ALEN;
3360 target_ap_addr = pos;
3361 pos += ETH_ALEN;
3362 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
3363 MACSTR " target_ap_addr=" MACSTR,
3364 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
3365
3366 if (frame->packet_type == FT_PACKET_REQUEST) {
3367 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
3368
3369 if (action != 1) {
3370 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
3371 "RRB Request", action);
3372 return -1;
3373 }
3374
3375 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
3376 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
3377 "RRB Request does not match with own "
3378 "address");
3379 return -1;
3380 }
3381
3382 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
3383 sta_addr, pos, end - pos) < 0)
3384 return -1;
3385 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
3386 u16 status_code;
3387
3388 if (end - pos < 2) {
3389 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
3390 "code in RRB Response");
3391 return -1;
3392 }
3393 status_code = WPA_GET_LE16(pos);
3394 pos += 2;
3395
3396 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
3397 "(status_code=%d)", status_code);
3398
3399 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
3400 return -1;
3401 } else {
3402 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
3403 "packet_type %d", frame->packet_type);
3404 return -1;
3405 }
3406
3407 if (end > pos) {
3408 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
3409 pos, end - pos);
3410 }
3411
3412 return 0;
3413 }
3414
3415
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)3416 void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
3417 const u8 *dst_addr, u8 oui_suffix, const u8 *data,
3418 size_t data_len)
3419 {
3420 const u8 *auth, *enc;
3421 size_t alen, elen;
3422 int no_defer = 0;
3423
3424 wpa_printf(MSG_DEBUG, "FT: RRB-OUI received frame from remote AP "
3425 MACSTR, MAC2STR(src_addr));
3426 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame - oui_suffix=%d", oui_suffix);
3427
3428 if (is_multicast_ether_addr(src_addr)) {
3429 wpa_printf(MSG_DEBUG,
3430 "FT: RRB-OUI received frame from multicast address "
3431 MACSTR, MAC2STR(src_addr));
3432 return;
3433 }
3434
3435 if (is_multicast_ether_addr(dst_addr)) {
3436 wpa_printf(MSG_DEBUG,
3437 "FT: RRB-OUI received frame from remote AP " MACSTR
3438 " to multicast address " MACSTR,
3439 MAC2STR(src_addr), MAC2STR(dst_addr));
3440 no_defer = 1;
3441 }
3442
3443 if (data_len < sizeof(u16)) {
3444 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
3445 return;
3446 }
3447
3448 alen = WPA_GET_LE16(data);
3449 if (data_len < sizeof(u16) + alen) {
3450 wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
3451 return;
3452 }
3453
3454 auth = data + sizeof(u16);
3455 enc = data + sizeof(u16) + alen;
3456 elen = data_len - sizeof(u16) - alen;
3457
3458 switch (oui_suffix) {
3459 case FT_PACKET_R0KH_R1KH_PULL:
3460 wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
3461 no_defer);
3462 break;
3463 case FT_PACKET_R0KH_R1KH_RESP:
3464 wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
3465 no_defer);
3466 break;
3467 case FT_PACKET_R0KH_R1KH_PUSH:
3468 wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
3469 no_defer);
3470 break;
3471 case FT_PACKET_R0KH_R1KH_SEQ_REQ:
3472 wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
3473 no_defer);
3474 break;
3475 case FT_PACKET_R0KH_R1KH_SEQ_RESP:
3476 wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
3477 alen, no_defer);
3478 break;
3479 }
3480 }
3481
3482
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)3483 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
3484 struct wpa_ft_pmk_r0_sa *pmk_r0,
3485 struct ft_remote_r1kh *r1kh,
3486 const u8 *s1kh_id)
3487 {
3488 u8 *packet;
3489 size_t packet_len;
3490 struct ft_rrb_seq f_seq;
3491 struct tlv_list push[] = {
3492 { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
3493 .data = s1kh_id },
3494 { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
3495 .data = pmk_r0->pmk_r0_name },
3496 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3497 };
3498 struct tlv_list push_auth[] = {
3499 { .type = FT_RRB_SEQ, .len = sizeof(f_seq),
3500 .data = (u8 *) &f_seq },
3501 { .type = FT_RRB_R0KH_ID,
3502 .len = wpa_auth->conf.r0_key_holder_len,
3503 .data = wpa_auth->conf.r0_key_holder },
3504 { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
3505 .data = r1kh->id },
3506 { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
3507 };
3508
3509 if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
3510 wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
3511 return -1;
3512 }
3513
3514 if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
3515 r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
3516 FT_PACKET_R0KH_R1KH_PUSH,
3517 &packet, &packet_len) < 0)
3518 return -1;
3519
3520 wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
3521 packet, packet_len);
3522
3523 os_free(packet);
3524 return 0;
3525 }
3526
3527
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)3528 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
3529 {
3530 struct wpa_ft_pmk_r0_sa *r0;
3531 struct ft_remote_r1kh *r1kh;
3532
3533 if (!wpa_auth->conf.pmk_r1_push)
3534 return;
3535 if (!wpa_auth->conf.r1kh_list)
3536 return;
3537
3538 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
3539 while (r0) {
3540 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
3541 break;
3542 r0 = r0->next;
3543 }
3544
3545 if (r0 == NULL || r0->pmk_r1_pushed)
3546 return;
3547 r0->pmk_r1_pushed = 1;
3548
3549 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
3550 "for STA " MACSTR, MAC2STR(addr));
3551
3552 for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
3553 if (is_zero_ether_addr(r1kh->addr) ||
3554 is_zero_ether_addr(r1kh->id))
3555 continue;
3556 if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
3557 continue;
3558 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
3559 }
3560 }
3561
3562 #endif /* CONFIG_IEEE80211R_AP */
3563