1 /*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2018, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/aes_wrap.h"
13 #include "crypto/sha384.h"
14 #include "crypto/random.h"
15 #include "common/ieee802_11_defs.h"
16 #include "common/ieee802_11_common.h"
17 #include "common/ocv.h"
18 #include "common/wpa_ctrl.h"
19 #include "drivers/driver.h"
20 #include "wpa.h"
21 #include "wpa_i.h"
22 #include "wpa_ie.h"
23 #include "pmksa_cache.h"
24
25 #ifdef CONFIG_IEEE80211R
26
27 #ifdef CONFIG_PASN
28 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid);
29 #else /* CONFIG_PASN */
wpa_ft_pasn_store_r1kh(struct wpa_sm * sm,const u8 * bssid)30 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid)
31 {
32 }
33 #endif /* CONFIG_PASN */
34
35
wpa_derive_ptk_ft(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)36 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
37 const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
38 {
39 u8 ptk_name[WPA_PMK_NAME_LEN];
40 const u8 *anonce = key->key_nonce;
41 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
42 const u8 *mpmk;
43 size_t mpmk_len, kdk_len;
44
45 if (sm->xxkey_len > 0) {
46 mpmk = sm->xxkey;
47 mpmk_len = sm->xxkey_len;
48 } else if (sm->cur_pmksa) {
49 mpmk = sm->cur_pmksa->pmk;
50 mpmk_len = sm->cur_pmksa->pmk_len;
51 } else {
52 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
53 "derivation");
54 return -1;
55 }
56
57 sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
58 if (wpa_derive_pmk_r0(mpmk, mpmk_len, sm->ssid,
59 sm->ssid_len, sm->mobility_domain,
60 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
61 sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0)
62 return -1;
63 sm->pmk_r1_len = sm->pmk_r0_len;
64 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
65 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
66 sm->pmk_r1_name) < 0)
67 return -1;
68
69 wpa_ft_pasn_store_r1kh(sm, src_addr);
70
71 if (sm->force_kdk_derivation ||
72 (sm->secure_ltf &&
73 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF)))
74 kdk_len = WPA_KDK_MAX_LEN;
75 else
76 kdk_len = 0;
77
78 return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce, anonce,
79 sm->own_addr, sm->bssid, sm->pmk_r1_name, ptk,
80 ptk_name, sm->key_mgmt, sm->pairwise_cipher,
81 kdk_len);
82 }
83
84
85 /**
86 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
87 * @sm: Pointer to WPA state machine data from wpa_sm_init()
88 * @ies: Association Response IEs or %NULL to clear FT parameters
89 * @ies_len: Length of ies buffer in octets
90 * Returns: 0 on success, -1 on failure
91 */
wpa_sm_set_ft_params(struct wpa_sm * sm,const u8 * ies,size_t ies_len)92 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
93 {
94 struct wpa_ft_ies ft;
95 int use_sha384;
96
97 if (sm == NULL)
98 return 0;
99
100 if (!get_ie(ies, ies_len, WLAN_EID_MOBILITY_DOMAIN)) {
101 os_free(sm->assoc_resp_ies);
102 sm->assoc_resp_ies = NULL;
103 sm->assoc_resp_ies_len = 0;
104 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
105 os_memset(sm->r0kh_id, 0, FT_R0KH_ID_MAX_LEN);
106 sm->r0kh_id_len = 0;
107 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
108 return 0;
109 }
110
111 use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
112 if (wpa_ft_parse_ies(ies, ies_len, &ft, use_sha384) < 0)
113 return -1;
114
115 if (ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
116 return -1;
117
118 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
119 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
120 os_memcpy(sm->mobility_domain, ft.mdie, MOBILITY_DOMAIN_ID_LEN);
121 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
122 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
123 sm->mdie_ft_capab);
124
125 if (ft.r0kh_id) {
126 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
127 ft.r0kh_id, ft.r0kh_id_len);
128 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
129 sm->r0kh_id_len = ft.r0kh_id_len;
130 } else {
131 /* FIX: When should R0KH-ID be cleared? We need to keep the
132 * old R0KH-ID in order to be able to use this during FT. */
133 /*
134 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
135 * sm->r0kh_id_len = 0;
136 */
137 }
138
139 if (ft.r1kh_id) {
140 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
141 ft.r1kh_id, FT_R1KH_ID_LEN);
142 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
143 } else
144 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
145
146 os_free(sm->assoc_resp_ies);
147 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
148 if (sm->assoc_resp_ies) {
149 u8 *pos = sm->assoc_resp_ies;
150
151 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
152 pos += ft.mdie_len + 2;
153
154 if (ft.ftie) {
155 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
156 pos += ft.ftie_len + 2;
157 }
158 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
159 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
160 "(Re)Association Response",
161 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
162 }
163
164 return 0;
165 }
166
167
168 /**
169 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
170 * @sm: Pointer to WPA state machine data from wpa_sm_init()
171 * @len: Buffer for returning the length of the IEs
172 * @anonce: ANonce or %NULL if not yet available
173 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
174 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
175 * @kck_len: KCK length in octets
176 * @target_ap: Target AP address
177 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
178 * @ric_ies_len: Length of ric_ies buffer in octets
179 * @ap_mdie: Mobility Domain IE from the target AP
180 * @omit_rsnxe: Whether RSNXE is omitted from Reassociation Request frame
181 * Returns: Pointer to buffer with IEs or %NULL on failure
182 *
183 * Caller is responsible for freeing the returned buffer with os_free();
184 */
wpa_ft_gen_req_ies(struct wpa_sm * sm,size_t * len,const u8 * anonce,const u8 * pmk_name,const u8 * kck,size_t kck_len,const u8 * target_ap,const u8 * ric_ies,size_t ric_ies_len,const u8 * ap_mdie,int omit_rsnxe)185 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
186 const u8 *anonce, const u8 *pmk_name,
187 const u8 *kck, size_t kck_len,
188 const u8 *target_ap,
189 const u8 *ric_ies, size_t ric_ies_len,
190 const u8 *ap_mdie, int omit_rsnxe)
191 {
192 size_t buf_len;
193 u8 *buf, *pos, *ftie_len, *ftie_pos, *fte_mic, *elem_count;
194 struct rsn_mdie *mdie;
195 struct rsn_ie_hdr *rsnie;
196 int mdie_len;
197 u8 rsnxe[10];
198 size_t rsnxe_len;
199 int rsnxe_used;
200 int res;
201
202 sm->ft_completed = 0;
203 sm->ft_reassoc_completed = 0;
204
205 buf_len = 2 + sizeof(struct rsn_mdie) + 2 +
206 sizeof(struct rsn_ftie_sha384) +
207 2 + sm->r0kh_id_len + ric_ies_len + 100;
208 buf = os_zalloc(buf_len);
209 if (buf == NULL)
210 return NULL;
211 pos = buf;
212
213 /* RSNIE[PMKR0Name/PMKR1Name] */
214 rsnie = (struct rsn_ie_hdr *) pos;
215 rsnie->elem_id = WLAN_EID_RSN;
216 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
217 pos = (u8 *) (rsnie + 1);
218
219 /* Group Suite Selector */
220 if (!wpa_cipher_valid_group(sm->group_cipher)) {
221 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
222 sm->group_cipher);
223 os_free(buf);
224 return NULL;
225 }
226 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
227 sm->group_cipher));
228 pos += RSN_SELECTOR_LEN;
229
230 /* Pairwise Suite Count */
231 WPA_PUT_LE16(pos, 1);
232 pos += 2;
233
234 /* Pairwise Suite List */
235 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
236 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
237 sm->pairwise_cipher);
238 os_free(buf);
239 return NULL;
240 }
241 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
242 sm->pairwise_cipher));
243 pos += RSN_SELECTOR_LEN;
244
245 /* Authenticated Key Management Suite Count */
246 WPA_PUT_LE16(pos, 1);
247 pos += 2;
248
249 /* Authenticated Key Management Suite List */
250 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
251 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
252 #ifdef CONFIG_SHA384
253 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
254 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
255 #endif /* CONFIG_SHA384 */
256 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
257 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
258 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
259 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
260 #ifdef CONFIG_FILS
261 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
262 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
263 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
264 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
265 #endif /* CONFIG_FILS */
266 else {
267 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
268 sm->key_mgmt);
269 os_free(buf);
270 return NULL;
271 }
272 pos += RSN_SELECTOR_LEN;
273
274 /* RSN Capabilities */
275 WPA_PUT_LE16(pos, rsn_supp_capab(sm));
276 pos += 2;
277
278 /* PMKID Count */
279 WPA_PUT_LE16(pos, 1);
280 pos += 2;
281
282 /* PMKID List [PMKR0Name/PMKR1Name] */
283 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
284 pos += WPA_PMK_NAME_LEN;
285
286 /* Management Group Cipher Suite */
287 switch (sm->mgmt_group_cipher) {
288 case WPA_CIPHER_AES_128_CMAC:
289 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
290 pos += RSN_SELECTOR_LEN;
291 break;
292 case WPA_CIPHER_BIP_GMAC_128:
293 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_128);
294 pos += RSN_SELECTOR_LEN;
295 break;
296 case WPA_CIPHER_BIP_GMAC_256:
297 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_256);
298 pos += RSN_SELECTOR_LEN;
299 break;
300 case WPA_CIPHER_BIP_CMAC_256:
301 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_CMAC_256);
302 pos += RSN_SELECTOR_LEN;
303 break;
304 }
305
306 rsnie->len = (pos - (u8 *) rsnie) - 2;
307
308 /* MDIE */
309 mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
310 if (mdie_len <= 0) {
311 os_free(buf);
312 return NULL;
313 }
314 mdie = (struct rsn_mdie *) (pos + 2);
315 pos += mdie_len;
316
317 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
318 ftie_pos = pos;
319 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
320 ftie_len = pos++;
321 rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) && anonce &&
322 (sm->sae_pwe == 1 || sm->sae_pwe == 2);
323 #ifdef CONFIG_TESTING_OPTIONS
324 if (anonce && sm->ft_rsnxe_used) {
325 rsnxe_used = sm->ft_rsnxe_used == 1;
326 wpa_printf(MSG_DEBUG, "TESTING: FT: Force RSNXE Used %d",
327 rsnxe_used);
328 }
329 #endif /* CONFIG_TESTING_OPTIONS */
330 if (wpa_key_mgmt_sha384(sm->key_mgmt)) {
331 struct rsn_ftie_sha384 *ftie;
332
333 ftie = (struct rsn_ftie_sha384 *) pos;
334 ftie->mic_control[0] = !!rsnxe_used;
335 fte_mic = ftie->mic;
336 elem_count = &ftie->mic_control[1];
337 pos += sizeof(*ftie);
338 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
339 if (anonce)
340 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
341 } else {
342 struct rsn_ftie *ftie;
343
344 ftie = (struct rsn_ftie *) pos;
345 ftie->mic_control[0] = !!rsnxe_used;
346 fte_mic = ftie->mic;
347 elem_count = &ftie->mic_control[1];
348 pos += sizeof(*ftie);
349 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
350 if (anonce)
351 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
352 }
353 if (kck) {
354 /* R1KH-ID sub-element in third FT message */
355 *pos++ = FTIE_SUBELEM_R1KH_ID;
356 *pos++ = FT_R1KH_ID_LEN;
357 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
358 pos += FT_R1KH_ID_LEN;
359 }
360 /* R0KH-ID sub-element */
361 *pos++ = FTIE_SUBELEM_R0KH_ID;
362 *pos++ = sm->r0kh_id_len;
363 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
364 pos += sm->r0kh_id_len;
365 #ifdef CONFIG_OCV
366 if (kck && wpa_sm_ocv_enabled(sm)) {
367 /* OCI sub-element in the third FT message */
368 struct wpa_channel_info ci;
369
370 if (wpa_sm_channel_info(sm, &ci) != 0) {
371 wpa_printf(MSG_WARNING,
372 "Failed to get channel info for OCI element in FTE");
373 os_free(buf);
374 return NULL;
375 }
376 #ifdef CONFIG_TESTING_OPTIONS
377 if (sm->oci_freq_override_ft_assoc) {
378 wpa_printf(MSG_INFO,
379 "TEST: Override OCI KDE frequency %d -> %d MHz",
380 ci.frequency, sm->oci_freq_override_ft_assoc);
381 ci.frequency = sm->oci_freq_override_ft_assoc;
382 }
383 #endif /* CONFIG_TESTING_OPTIONS */
384
385 *pos++ = FTIE_SUBELEM_OCI;
386 *pos++ = OCV_OCI_LEN;
387 if (ocv_insert_oci(&ci, &pos) < 0) {
388 os_free(buf);
389 return NULL;
390 }
391 }
392 #endif /* CONFIG_OCV */
393 *ftie_len = pos - ftie_len - 1;
394
395 if (ric_ies) {
396 /* RIC Request */
397 os_memcpy(pos, ric_ies, ric_ies_len);
398 pos += ric_ies_len;
399 }
400
401 if (omit_rsnxe) {
402 rsnxe_len = 0;
403 } else {
404 res = wpa_gen_rsnxe(sm, rsnxe, sizeof(rsnxe));
405 if (res < 0) {
406 os_free(buf);
407 return NULL;
408 }
409 rsnxe_len = res;
410 }
411
412 if (kck) {
413 /*
414 * IEEE Std 802.11r-2008, 11A.8.4
415 * MIC shall be calculated over:
416 * non-AP STA MAC address
417 * Target AP MAC address
418 * Transaction seq number (5 for ReassocReq, 3 otherwise)
419 * RSN IE
420 * MDIE
421 * FTIE (with MIC field set to 0)
422 * RIC-Request (if present)
423 * RSNXE (if present)
424 */
425 /* Information element count */
426 *elem_count = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len);
427 if (rsnxe_len)
428 *elem_count += 1;
429 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
430 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
431 ftie_pos, 2 + *ftie_len,
432 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
433 ric_ies_len, rsnxe_len ? rsnxe : NULL, rsnxe_len,
434 fte_mic) < 0) {
435 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
436 os_free(buf);
437 return NULL;
438 }
439 }
440
441 *len = pos - buf;
442
443 return buf;
444 }
445
446
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)447 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
448 {
449 int keylen;
450 enum wpa_alg alg;
451 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
452
453 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
454
455 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
456 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
457 sm->pairwise_cipher);
458 return -1;
459 }
460
461 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
462 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
463
464 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, sizeof(null_rsc),
465 (u8 *) sm->ptk.tk, keylen,
466 KEY_FLAG_PAIRWISE_RX_TX) < 0) {
467 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
468 return -1;
469 }
470
471 wpa_sm_store_ptk(sm, sm->bssid, sm->pairwise_cipher,
472 sm->dot11RSNAConfigPMKLifetime, &sm->ptk);
473 return 0;
474 }
475
476
477 /**
478 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
479 * @sm: Pointer to WPA state machine data from wpa_sm_init()
480 * @mdie: Target AP MDIE
481 * Returns: 0 on success, -1 on failure
482 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)483 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
484 {
485 u8 *ft_ies;
486 size_t ft_ies_len;
487
488 /* Generate a new SNonce */
489 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
490 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
491 return -1;
492 }
493
494 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
495 NULL, 0, sm->bssid, NULL, 0, mdie, 0);
496 if (ft_ies) {
497 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
498 ft_ies, ft_ies_len);
499 os_free(ft_ies);
500 }
501
502 return 0;
503 }
504
505
wpa_ft_add_mdie(struct wpa_sm * sm,u8 * buf,size_t buf_len,const u8 * ap_mdie)506 int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
507 const u8 *ap_mdie)
508 {
509 u8 *pos = buf;
510 struct rsn_mdie *mdie;
511
512 if (buf_len < 2 + sizeof(*mdie)) {
513 wpa_printf(MSG_INFO,
514 "FT: Failed to add MDIE: short buffer, length=%zu",
515 buf_len);
516 return 0;
517 }
518
519 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
520 *pos++ = sizeof(*mdie);
521 mdie = (struct rsn_mdie *) pos;
522 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
523 MOBILITY_DOMAIN_ID_LEN);
524 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
525 sm->mdie_ft_capab;
526
527 return 2 + sizeof(*mdie);
528 }
529
530
wpa_sm_get_ft_md(struct wpa_sm * sm)531 const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
532 {
533 return sm->mobility_domain;
534 }
535
536
wpa_ft_process_response(struct wpa_sm * sm,const u8 * ies,size_t ies_len,int ft_action,const u8 * target_ap,const u8 * ric_ies,size_t ric_ies_len)537 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
538 int ft_action, const u8 *target_ap,
539 const u8 *ric_ies, size_t ric_ies_len)
540 {
541 u8 *ft_ies;
542 size_t ft_ies_len;
543 struct wpa_ft_ies parse;
544 struct rsn_mdie *mdie;
545 u8 ptk_name[WPA_PMK_NAME_LEN];
546 int ret;
547 const u8 *bssid;
548 const u8 *kck;
549 size_t kck_len, kdk_len;
550 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
551 const u8 *anonce, *snonce;
552
553 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
554 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
555
556 if (ft_action) {
557 if (!sm->over_the_ds_in_progress) {
558 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
559 "- drop FT Action Response");
560 return -1;
561 }
562
563 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
564 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
565 "with this Target AP - drop FT Action "
566 "Response");
567 return -1;
568 }
569 }
570
571 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
572 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
573 "enabled for this connection");
574 return -1;
575 }
576
577 if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
578 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
579 return -1;
580 }
581
582 mdie = (struct rsn_mdie *) parse.mdie;
583 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
584 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
585 MOBILITY_DOMAIN_ID_LEN) != 0) {
586 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
587 return -1;
588 }
589
590 if (use_sha384) {
591 struct rsn_ftie_sha384 *ftie;
592
593 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
594 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
595 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
596 return -1;
597 }
598
599 anonce = ftie->anonce;
600 snonce = ftie->snonce;
601 } else {
602 struct rsn_ftie *ftie;
603
604 ftie = (struct rsn_ftie *) parse.ftie;
605 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
606 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
607 return -1;
608 }
609
610 anonce = ftie->anonce;
611 snonce = ftie->snonce;
612 }
613
614 if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
615 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
616 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
617 snonce, WPA_NONCE_LEN);
618 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
619 sm->snonce, WPA_NONCE_LEN);
620 return -1;
621 }
622
623 if (parse.r0kh_id == NULL) {
624 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
625 return -1;
626 }
627
628 if (parse.r0kh_id_len != sm->r0kh_id_len ||
629 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
630 {
631 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
632 "the current R0KH-ID");
633 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
634 parse.r0kh_id, parse.r0kh_id_len);
635 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
636 sm->r0kh_id, sm->r0kh_id_len);
637 return -1;
638 }
639
640 if (parse.r1kh_id == NULL) {
641 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
642 return -1;
643 }
644
645 if (parse.rsn_pmkid == NULL ||
646 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
647 {
648 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
649 "RSNIE");
650 return -1;
651 }
652
653 if (sm->mfp == 2 && !(parse.rsn_capab & WPA_CAPABILITY_MFPC)) {
654 wpa_printf(MSG_INFO,
655 "FT: Target AP does not support PMF, but local configuration requires that");
656 return -1;
657 }
658
659 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
660 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
661 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
662 wpa_hexdump(MSG_DEBUG, "FT: ANonce", anonce, WPA_NONCE_LEN);
663 os_memcpy(sm->anonce, anonce, WPA_NONCE_LEN);
664 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
665 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
666 sm->pmk_r1_name) < 0)
667 return -1;
668 sm->pmk_r1_len = sm->pmk_r0_len;
669
670 bssid = target_ap;
671
672 wpa_ft_pasn_store_r1kh(sm, bssid);
673
674 if (sm->force_kdk_derivation ||
675 (sm->secure_ltf &&
676 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF)))
677 kdk_len = WPA_KDK_MAX_LEN;
678 else
679 kdk_len = 0;
680
681 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
682 anonce, sm->own_addr, bssid,
683 sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
684 sm->pairwise_cipher,
685 kdk_len) < 0)
686 return -1;
687
688 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
689 kck = sm->ptk.kck2;
690 kck_len = sm->ptk.kck2_len;
691 } else {
692 kck = sm->ptk.kck;
693 kck_len = sm->ptk.kck_len;
694 }
695 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, anonce,
696 sm->pmk_r1_name,
697 kck, kck_len, bssid,
698 ric_ies, ric_ies_len,
699 parse.mdie ? parse.mdie - 2 : NULL,
700 !sm->ap_rsnxe);
701 if (ft_ies) {
702 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
703 ft_ies, ft_ies_len);
704 os_free(ft_ies);
705 }
706
707 wpa_sm_mark_authenticated(sm, bssid);
708 ret = wpa_ft_install_ptk(sm, bssid);
709 if (ret) {
710 /*
711 * Some drivers do not support key configuration when we are
712 * not associated with the target AP. Work around this by
713 * trying again after the following reassociation gets
714 * completed.
715 */
716 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
717 "association - try again after reassociation");
718 sm->set_ptk_after_assoc = 1;
719 } else
720 sm->set_ptk_after_assoc = 0;
721
722 sm->ft_completed = 1;
723 if (ft_action) {
724 /*
725 * The caller is expected trigger re-association with the
726 * Target AP.
727 */
728 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
729 }
730
731 return 0;
732 }
733
734
wpa_ft_is_completed(struct wpa_sm * sm)735 int wpa_ft_is_completed(struct wpa_sm *sm)
736 {
737 if (sm == NULL)
738 return 0;
739
740 if (!wpa_key_mgmt_ft(sm->key_mgmt))
741 return 0;
742
743 return sm->ft_completed;
744 }
745
746
wpa_reset_ft_completed(struct wpa_sm * sm)747 void wpa_reset_ft_completed(struct wpa_sm *sm)
748 {
749 if (sm != NULL)
750 sm->ft_completed = 0;
751 }
752
753
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)754 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
755 size_t gtk_elem_len)
756 {
757 u8 gtk[32];
758 int keyidx;
759 enum wpa_alg alg;
760 size_t gtk_len, keylen, rsc_len;
761 const u8 *kek;
762 size_t kek_len;
763
764 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
765 kek = sm->ptk.kek2;
766 kek_len = sm->ptk.kek2_len;
767 } else {
768 kek = sm->ptk.kek;
769 kek_len = sm->ptk.kek_len;
770 }
771
772 if (gtk_elem == NULL) {
773 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
774 return 0;
775 }
776
777 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
778 gtk_elem, gtk_elem_len);
779
780 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
781 gtk_elem_len - 19 > sizeof(gtk)) {
782 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
783 "length %lu", (unsigned long) gtk_elem_len);
784 return -1;
785 }
786 gtk_len = gtk_elem_len - 19;
787 if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
788 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
789 "decrypt GTK");
790 return -1;
791 }
792
793 keylen = wpa_cipher_key_len(sm->group_cipher);
794 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
795 alg = wpa_cipher_to_alg(sm->group_cipher);
796 if (alg == WPA_ALG_NONE) {
797 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
798 sm->group_cipher);
799 return -1;
800 }
801
802 if (gtk_len < keylen) {
803 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
804 return -1;
805 }
806
807 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
808
809 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
810
811 if (gtk_elem[2] != keylen) {
812 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
813 "negotiated %lu",
814 gtk_elem[2], (unsigned long) keylen);
815 return -1;
816 }
817
818 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
819 if (sm->group_cipher == WPA_CIPHER_TKIP) {
820 /* Swap Tx/Rx keys for Michael MIC */
821 u8 tmp[8];
822 os_memcpy(tmp, gtk + 16, 8);
823 os_memcpy(gtk + 16, gtk + 24, 8);
824 os_memcpy(gtk + 24, tmp, 8);
825 }
826 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
827 gtk_elem + 3, rsc_len, gtk, keylen,
828 KEY_FLAG_GROUP_RX) < 0) {
829 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
830 "driver.");
831 return -1;
832 }
833
834 return 0;
835 }
836
837
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)838 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
839 size_t igtk_elem_len)
840 {
841 u8 igtk[WPA_IGTK_MAX_LEN];
842 size_t igtk_len;
843 u16 keyidx;
844 const u8 *kek;
845 size_t kek_len;
846
847 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
848 kek = sm->ptk.kek2;
849 kek_len = sm->ptk.kek2_len;
850 } else {
851 kek = sm->ptk.kek;
852 kek_len = sm->ptk.kek_len;
853 }
854
855 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
856 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
857 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
858 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
859 return 0;
860
861 if (igtk_elem == NULL) {
862 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
863 return 0;
864 }
865
866 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
867 igtk_elem, igtk_elem_len);
868
869 igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
870 if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
871 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
872 "length %lu", (unsigned long) igtk_elem_len);
873 return -1;
874 }
875 if (igtk_elem[8] != igtk_len) {
876 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
877 "%d", igtk_elem[8]);
878 return -1;
879 }
880
881 if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
882 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
883 "decrypt IGTK");
884 return -1;
885 }
886
887 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
888
889 keyidx = WPA_GET_LE16(igtk_elem);
890
891 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
892 igtk_len);
893 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
894 broadcast_ether_addr, keyidx, 0,
895 igtk_elem + 2, 6, igtk, igtk_len,
896 KEY_FLAG_GROUP_RX) < 0) {
897 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
898 "driver.");
899 forced_memzero(igtk, sizeof(igtk));
900 return -1;
901 }
902 forced_memzero(igtk, sizeof(igtk));
903
904 return 0;
905 }
906
907
wpa_ft_process_bigtk_subelem(struct wpa_sm * sm,const u8 * bigtk_elem,size_t bigtk_elem_len)908 static int wpa_ft_process_bigtk_subelem(struct wpa_sm *sm, const u8 *bigtk_elem,
909 size_t bigtk_elem_len)
910 {
911 u8 bigtk[WPA_BIGTK_MAX_LEN];
912 size_t bigtk_len;
913 u16 keyidx;
914 const u8 *kek;
915 size_t kek_len;
916
917 if (!sm->beacon_prot || !bigtk_elem ||
918 (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
919 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
920 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
921 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256))
922 return 0;
923
924 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
925 kek = sm->ptk.kek2;
926 kek_len = sm->ptk.kek2_len;
927 } else {
928 kek = sm->ptk.kek;
929 kek_len = sm->ptk.kek_len;
930 }
931
932 wpa_hexdump_key(MSG_DEBUG, "FT: Received BIGTK in Reassoc Resp",
933 bigtk_elem, bigtk_elem_len);
934
935 bigtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
936 if (bigtk_elem_len != 2 + 6 + 1 + bigtk_len + 8) {
937 wpa_printf(MSG_DEBUG,
938 "FT: Invalid BIGTK sub-elem length %lu",
939 (unsigned long) bigtk_elem_len);
940 return -1;
941 }
942 if (bigtk_elem[8] != bigtk_len) {
943 wpa_printf(MSG_DEBUG,
944 "FT: Invalid BIGTK sub-elem Key Length %d",
945 bigtk_elem[8]);
946 return -1;
947 }
948
949 if (aes_unwrap(kek, kek_len, bigtk_len / 8, bigtk_elem + 9, bigtk)) {
950 wpa_printf(MSG_WARNING,
951 "FT: AES unwrap failed - could not decrypt BIGTK");
952 return -1;
953 }
954
955 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
956
957 keyidx = WPA_GET_LE16(bigtk_elem);
958
959 wpa_hexdump_key(MSG_DEBUG, "FT: BIGTK from Reassoc Resp", bigtk,
960 bigtk_len);
961 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
962 broadcast_ether_addr, keyidx, 0,
963 bigtk_elem + 2, 6, bigtk, bigtk_len,
964 KEY_FLAG_GROUP_RX) < 0) {
965 wpa_printf(MSG_WARNING,
966 "WPA: Failed to set BIGTK to the driver");
967 forced_memzero(bigtk, sizeof(bigtk));
968 return -1;
969 }
970 forced_memzero(bigtk, sizeof(bigtk));
971
972 return 0;
973 }
974
975
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)976 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
977 size_t ies_len, const u8 *src_addr)
978 {
979 struct wpa_ft_ies parse;
980 struct rsn_mdie *mdie;
981 unsigned int count;
982 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
983 const u8 *kck;
984 size_t kck_len;
985 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
986 const u8 *anonce, *snonce, *fte_mic;
987 u8 fte_elem_count;
988 int own_rsnxe_used, rsnxe_used;
989
990 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
991
992 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
993 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
994 "enabled for this connection");
995 return -1;
996 }
997
998 if (sm->ft_reassoc_completed) {
999 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
1000 return 0;
1001 }
1002
1003 if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
1004 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
1005 return -1;
1006 }
1007
1008 mdie = (struct rsn_mdie *) parse.mdie;
1009 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1010 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
1011 MOBILITY_DOMAIN_ID_LEN) != 0) {
1012 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1013 return -1;
1014 }
1015
1016 if (use_sha384) {
1017 struct rsn_ftie_sha384 *ftie;
1018
1019 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
1020 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
1021 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1022 return -1;
1023 }
1024
1025 anonce = ftie->anonce;
1026 snonce = ftie->snonce;
1027 rsnxe_used = ftie->mic_control[0] & 0x01;
1028 fte_elem_count = ftie->mic_control[1];
1029 fte_mic = ftie->mic;
1030 } else {
1031 struct rsn_ftie *ftie;
1032
1033 ftie = (struct rsn_ftie *) parse.ftie;
1034 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
1035 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1036 return -1;
1037 }
1038
1039 anonce = ftie->anonce;
1040 snonce = ftie->snonce;
1041 rsnxe_used = ftie->mic_control[0] & 0x01;
1042 fte_elem_count = ftie->mic_control[1];
1043 fte_mic = ftie->mic;
1044 }
1045
1046 if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
1047 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1048 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1049 snonce, WPA_NONCE_LEN);
1050 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1051 sm->snonce, WPA_NONCE_LEN);
1052 return -1;
1053 }
1054
1055 if (os_memcmp(anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
1056 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1057 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1058 anonce, WPA_NONCE_LEN);
1059 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1060 sm->anonce, WPA_NONCE_LEN);
1061 return -1;
1062 }
1063
1064 if (parse.r0kh_id == NULL) {
1065 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1066 return -1;
1067 }
1068
1069 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1070 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1071 {
1072 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1073 "the current R0KH-ID");
1074 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1075 parse.r0kh_id, parse.r0kh_id_len);
1076 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1077 sm->r0kh_id, sm->r0kh_id_len);
1078 return -1;
1079 }
1080
1081 if (parse.r1kh_id == NULL) {
1082 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1083 return -1;
1084 }
1085
1086 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
1087 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1088 "ReassocResp");
1089 return -1;
1090 }
1091
1092 if (parse.rsn_pmkid == NULL ||
1093 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1094 {
1095 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1096 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1097 return -1;
1098 }
1099
1100 count = 3;
1101 if (parse.ric)
1102 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1103 if (parse.rsnxe)
1104 count++;
1105 if (fte_elem_count != count) {
1106 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1107 "Control: received %u expected %u",
1108 fte_elem_count, count);
1109 return -1;
1110 }
1111
1112 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
1113 kck = sm->ptk.kck2;
1114 kck_len = sm->ptk.kck2_len;
1115 } else {
1116 kck = sm->ptk.kck;
1117 kck_len = sm->ptk.kck_len;
1118 }
1119
1120 if (wpa_ft_mic(kck, kck_len, sm->own_addr, src_addr, 6,
1121 parse.mdie - 2, parse.mdie_len + 2,
1122 parse.ftie - 2, parse.ftie_len + 2,
1123 parse.rsn - 2, parse.rsn_len + 2,
1124 parse.ric, parse.ric_len,
1125 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1126 parse.rsnxe ? parse.rsnxe_len + 2 : 0,
1127 mic) < 0) {
1128 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1129 return -1;
1130 }
1131
1132 if (os_memcmp_const(mic, fte_mic, 16) != 0) {
1133 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1134 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", fte_mic, 16);
1135 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
1136 return -1;
1137 }
1138
1139 if (rsnxe_used && !sm->ap_rsnxe) {
1140 wpa_printf(MSG_INFO,
1141 "FT: FTE indicated that AP uses RSNXE, but RSNXE was not included in Beacon/Probe Response frames");
1142 return -1;
1143 }
1144
1145 if (!sm->ap_rsn_ie) {
1146 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1147 "FT: No RSNE for this AP known - trying to get from scan results");
1148 if (wpa_sm_get_beacon_ie(sm) < 0) {
1149 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1150 "FT: Could not find AP from the scan results");
1151 return -1;
1152 }
1153 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
1154 "FT: Found the current AP from updated scan results");
1155 }
1156
1157 if (sm->ap_rsn_ie &&
1158 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
1159 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
1160 parse.rsn - 2, parse.rsn_len + 2)) {
1161 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1162 "FT: RSNE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1163 wpa_hexdump(MSG_INFO, "RSNE in Beacon/ProbeResp",
1164 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
1165 wpa_hexdump(MSG_INFO,
1166 "RSNE in FT protocol Reassociation Response frame",
1167 parse.rsn ? parse.rsn - 2 : NULL,
1168 parse.rsn ? parse.rsn_len + 2 : 0);
1169 return -1;
1170 }
1171
1172 own_rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) &&
1173 (sm->sae_pwe == 1 || sm->sae_pwe == 2);
1174 if ((sm->ap_rsnxe && !parse.rsnxe && own_rsnxe_used) ||
1175 (!sm->ap_rsnxe && parse.rsnxe) ||
1176 (sm->ap_rsnxe && parse.rsnxe &&
1177 (sm->ap_rsnxe_len != 2 + parse.rsnxe_len ||
1178 os_memcmp(sm->ap_rsnxe, parse.rsnxe - 2,
1179 sm->ap_rsnxe_len) != 0))) {
1180 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1181 "FT: RSNXE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1182 wpa_hexdump(MSG_INFO, "RSNXE in Beacon/ProbeResp",
1183 sm->ap_rsnxe, sm->ap_rsnxe_len);
1184 wpa_hexdump(MSG_INFO,
1185 "RSNXE in FT protocol Reassociation Response frame",
1186 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1187 parse.rsnxe ? parse.rsnxe_len + 2 : 0);
1188 return -1;
1189 }
1190
1191 #ifdef CONFIG_OCV
1192 if (wpa_sm_ocv_enabled(sm)) {
1193 struct wpa_channel_info ci;
1194
1195 if (wpa_sm_channel_info(sm, &ci) != 0) {
1196 wpa_printf(MSG_WARNING,
1197 "Failed to get channel info to validate received OCI in (Re)Assoc Response");
1198 return -1;
1199 }
1200
1201 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
1202 channel_width_to_int(ci.chanwidth),
1203 ci.seg1_idx) != OCI_SUCCESS) {
1204 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
1205 "addr=" MACSTR " frame=ft-assoc error=%s",
1206 MAC2STR(src_addr), ocv_errorstr);
1207 return -1;
1208 }
1209 }
1210 #endif /* CONFIG_OCV */
1211
1212 sm->ft_reassoc_completed = 1;
1213
1214 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0 ||
1215 wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0 ||
1216 wpa_ft_process_bigtk_subelem(sm, parse.bigtk, parse.bigtk_len) < 0)
1217 return -1;
1218
1219 if (sm->set_ptk_after_assoc) {
1220 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
1221 "are associated");
1222 if (wpa_ft_install_ptk(sm, src_addr) < 0)
1223 return -1;
1224 sm->set_ptk_after_assoc = 0;
1225 }
1226
1227 if (parse.ric) {
1228 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
1229 parse.ric, parse.ric_len);
1230 /* TODO: parse response and inform driver about results when
1231 * using wpa_supplicant SME */
1232 }
1233
1234 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
1235
1236 return 0;
1237 }
1238
1239
1240 /**
1241 * wpa_ft_start_over_ds - Generate over-the-DS auth request
1242 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1243 * @target_ap: Target AP Address
1244 * @mdie: Mobility Domain IE from the target AP
1245 * Returns: 0 on success, -1 on failure
1246 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie)1247 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1248 const u8 *mdie)
1249 {
1250 u8 *ft_ies;
1251 size_t ft_ies_len;
1252
1253 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1254 MAC2STR(target_ap));
1255
1256 /* Generate a new SNonce */
1257 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1258 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1259 return -1;
1260 }
1261
1262 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1263 NULL, 0, target_ap, NULL, 0, mdie, 0);
1264 if (ft_ies) {
1265 sm->over_the_ds_in_progress = 1;
1266 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1267 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1268 os_free(ft_ies);
1269 }
1270
1271 return 0;
1272 }
1273
1274
1275 #ifdef CONFIG_PASN
1276
wpa_ft_pasn_get_r1kh(struct wpa_sm * sm,const u8 * bssid)1277 static struct pasn_ft_r1kh * wpa_ft_pasn_get_r1kh(struct wpa_sm *sm,
1278 const u8 *bssid)
1279 {
1280 size_t i;
1281
1282 for (i = 0; i < sm->n_pasn_r1kh; i++)
1283 if (os_memcmp(sm->pasn_r1kh[i].bssid, bssid, ETH_ALEN) == 0)
1284 return &sm->pasn_r1kh[i];
1285
1286 return NULL;
1287 }
1288
1289
wpa_ft_pasn_store_r1kh(struct wpa_sm * sm,const u8 * bssid)1290 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid)
1291 {
1292 struct pasn_ft_r1kh *tmp = wpa_ft_pasn_get_r1kh(sm, bssid);
1293
1294 if (tmp)
1295 return;
1296
1297 tmp = os_realloc_array(sm->pasn_r1kh, sm->n_pasn_r1kh + 1,
1298 sizeof(*tmp));
1299 if (!tmp) {
1300 wpa_printf(MSG_DEBUG, "PASN: FT: Failed to store R1KH");
1301 return;
1302 }
1303
1304 sm->pasn_r1kh = tmp;
1305 tmp = &sm->pasn_r1kh[sm->n_pasn_r1kh];
1306
1307 wpa_printf(MSG_DEBUG, "PASN: FT: Store R1KH for " MACSTR,
1308 MAC2STR(bssid));
1309
1310 os_memcpy(tmp->bssid, bssid, ETH_ALEN);
1311 os_memcpy(tmp->r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN);
1312
1313 sm->n_pasn_r1kh++;
1314 }
1315
1316
wpa_pasn_ft_derive_pmk_r1(struct wpa_sm * sm,int akmp,const u8 * bssid,u8 * pmk_r1,size_t * pmk_r1_len,u8 * pmk_r1_name)1317 int wpa_pasn_ft_derive_pmk_r1(struct wpa_sm *sm, int akmp, const u8 *bssid,
1318 u8 *pmk_r1, size_t *pmk_r1_len, u8 *pmk_r1_name)
1319 {
1320 struct pasn_ft_r1kh *r1kh_entry;
1321
1322 if (sm->key_mgmt != (unsigned int) akmp) {
1323 wpa_printf(MSG_DEBUG,
1324 "PASN: FT: Key management mismatch: %u != %u",
1325 sm->key_mgmt, akmp);
1326 return -1;
1327 }
1328
1329 r1kh_entry = wpa_ft_pasn_get_r1kh(sm, bssid);
1330 if (!r1kh_entry) {
1331 wpa_printf(MSG_DEBUG,
1332 "PASN: FT: Cannot find R1KH-ID for " MACSTR,
1333 MAC2STR(bssid));
1334 return -1;
1335 }
1336
1337 /*
1338 * Note: PMK R0 etc. were already derived and are maintained by the
1339 * state machine, and as the same key hierarchy is used, there is no
1340 * need to derive them again, so only derive PMK R1 etc.
1341 */
1342 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
1343 r1kh_entry->r1kh_id, sm->own_addr, pmk_r1,
1344 pmk_r1_name) < 0)
1345 return -1;
1346
1347 *pmk_r1_len = sm->pmk_r0_len;
1348
1349 wpa_hexdump_key(MSG_DEBUG, "PASN: FT: PMK-R1", pmk_r1, sm->pmk_r0_len);
1350 wpa_hexdump(MSG_DEBUG, "PASN: FT: PMKR1Name", pmk_r1_name,
1351 WPA_PMK_NAME_LEN);
1352
1353 return 0;
1354 }
1355
1356 #endif /* CONFIG_PASN */
1357
1358 #endif /* CONFIG_IEEE80211R */
1359
