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