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
22 #ifdef CONFIG_IEEE80211R
23
wpa_derive_ptk_ft(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)24 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
25 const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
26 {
27 u8 ptk_name[WPA_PMK_NAME_LEN];
28 const u8 *anonce = key->key_nonce;
29 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
30
31 if (sm->xxkey_len == 0) {
32 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
33 "derivation");
34 return -1;
35 }
36
37 sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
38 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
39 sm->ssid_len, sm->mobility_domain,
40 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
41 sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0)
42 return -1;
43 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, sm->pmk_r0_len);
44 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
45 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
46 sm->pmk_r1_len = sm->pmk_r0_len;
47 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
48 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
49 sm->pmk_r1_name) < 0)
50 return -1;
51 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, sm->pmk_r1_len);
52 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
53 WPA_PMK_NAME_LEN);
54 return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce, anonce,
55 sm->own_addr, sm->bssid, sm->pmk_r1_name, ptk,
56 ptk_name, sm->key_mgmt, sm->pairwise_cipher);
57 }
58
59
60 /**
61 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
62 * @sm: Pointer to WPA state machine data from wpa_sm_init()
63 * @ies: Association Response IEs or %NULL to clear FT parameters
64 * @ies_len: Length of ies buffer in octets
65 * Returns: 0 on success, -1 on failure
66 */
wpa_sm_set_ft_params(struct wpa_sm * sm,const u8 * ies,size_t ies_len)67 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
68 {
69 struct wpa_ft_ies ft;
70 int use_sha384;
71
72 if (sm == NULL)
73 return 0;
74
75 use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
76 if (wpa_ft_parse_ies(ies, ies_len, &ft, use_sha384) < 0)
77 return -1;
78
79 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
80 return -1;
81
82 if (ft.mdie) {
83 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
84 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
85 os_memcpy(sm->mobility_domain, ft.mdie,
86 MOBILITY_DOMAIN_ID_LEN);
87 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
88 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
89 sm->mdie_ft_capab);
90 } else
91 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
92
93 if (ft.r0kh_id) {
94 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
95 ft.r0kh_id, ft.r0kh_id_len);
96 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
97 sm->r0kh_id_len = ft.r0kh_id_len;
98 } else {
99 /* FIX: When should R0KH-ID be cleared? We need to keep the
100 * old R0KH-ID in order to be able to use this during FT. */
101 /*
102 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
103 * sm->r0kh_id_len = 0;
104 */
105 }
106
107 if (ft.r1kh_id) {
108 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
109 ft.r1kh_id, FT_R1KH_ID_LEN);
110 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
111 } else
112 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
113
114 os_free(sm->assoc_resp_ies);
115 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
116 if (sm->assoc_resp_ies) {
117 u8 *pos = sm->assoc_resp_ies;
118 if (ft.mdie) {
119 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
120 pos += ft.mdie_len + 2;
121 }
122 if (ft.ftie) {
123 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
124 pos += ft.ftie_len + 2;
125 }
126 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
127 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
128 "(Re)Association Response",
129 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
130 }
131
132 return 0;
133 }
134
135
136 /**
137 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
138 * @sm: Pointer to WPA state machine data from wpa_sm_init()
139 * @len: Buffer for returning the length of the IEs
140 * @anonce: ANonce or %NULL if not yet available
141 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
142 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
143 * @kck_len: KCK length in octets
144 * @target_ap: Target AP address
145 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
146 * @ric_ies_len: Length of ric_ies buffer in octets
147 * @ap_mdie: Mobility Domain IE from the target AP
148 * Returns: Pointer to buffer with IEs or %NULL on failure
149 *
150 * Caller is responsible for freeing the returned buffer with os_free();
151 */
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)152 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
153 const u8 *anonce, const u8 *pmk_name,
154 const u8 *kck, size_t kck_len,
155 const u8 *target_ap,
156 const u8 *ric_ies, size_t ric_ies_len,
157 const u8 *ap_mdie)
158 {
159 size_t buf_len;
160 u8 *buf, *pos, *ftie_len, *ftie_pos, *fte_mic, *elem_count;
161 struct rsn_mdie *mdie;
162 struct rsn_ie_hdr *rsnie;
163 u16 capab;
164 int mdie_len;
165
166 sm->ft_completed = 0;
167 sm->ft_reassoc_completed = 0;
168
169 buf_len = 2 + sizeof(struct rsn_mdie) + 2 +
170 sizeof(struct rsn_ftie_sha384) +
171 2 + sm->r0kh_id_len + ric_ies_len + 100;
172 buf = os_zalloc(buf_len);
173 if (buf == NULL)
174 return NULL;
175 pos = buf;
176
177 /* RSNIE[PMKR0Name/PMKR1Name] */
178 rsnie = (struct rsn_ie_hdr *) pos;
179 rsnie->elem_id = WLAN_EID_RSN;
180 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
181 pos = (u8 *) (rsnie + 1);
182
183 /* Group Suite Selector */
184 if (!wpa_cipher_valid_group(sm->group_cipher)) {
185 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
186 sm->group_cipher);
187 os_free(buf);
188 return NULL;
189 }
190 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
191 sm->group_cipher));
192 pos += RSN_SELECTOR_LEN;
193
194 /* Pairwise Suite Count */
195 WPA_PUT_LE16(pos, 1);
196 pos += 2;
197
198 /* Pairwise Suite List */
199 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
200 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
201 sm->pairwise_cipher);
202 os_free(buf);
203 return NULL;
204 }
205 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
206 sm->pairwise_cipher));
207 pos += RSN_SELECTOR_LEN;
208
209 /* Authenticated Key Management Suite Count */
210 WPA_PUT_LE16(pos, 1);
211 pos += 2;
212
213 /* Authenticated Key Management Suite List */
214 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
215 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
216 #ifdef CONFIG_SHA384
217 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
218 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
219 #endif /* CONFIG_SHA384 */
220 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
221 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
222 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
223 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
224 #ifdef CONFIG_FILS
225 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
226 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
227 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
228 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
229 #endif /* CONFIG_FILS */
230 else {
231 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
232 sm->key_mgmt);
233 os_free(buf);
234 return NULL;
235 }
236 pos += RSN_SELECTOR_LEN;
237
238 /* RSN Capabilities */
239 capab = 0;
240 #ifdef CONFIG_IEEE80211W
241 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC ||
242 sm->mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_128 ||
243 sm->mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_256 ||
244 sm->mgmt_group_cipher == WPA_CIPHER_BIP_CMAC_256)
245 capab |= WPA_CAPABILITY_MFPC;
246 #endif /* CONFIG_IEEE80211W */
247 if (sm->ocv)
248 capab |= WPA_CAPABILITY_OCVC;
249 WPA_PUT_LE16(pos, capab);
250 pos += 2;
251
252 /* PMKID Count */
253 WPA_PUT_LE16(pos, 1);
254 pos += 2;
255
256 /* PMKID List [PMKR0Name/PMKR1Name] */
257 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
258 pos += WPA_PMK_NAME_LEN;
259
260 #ifdef CONFIG_IEEE80211W
261 /* Management Group Cipher Suite */
262 switch (sm->mgmt_group_cipher) {
263 case WPA_CIPHER_AES_128_CMAC:
264 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
265 pos += RSN_SELECTOR_LEN;
266 break;
267 case WPA_CIPHER_BIP_GMAC_128:
268 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_128);
269 pos += RSN_SELECTOR_LEN;
270 break;
271 case WPA_CIPHER_BIP_GMAC_256:
272 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_256);
273 pos += RSN_SELECTOR_LEN;
274 break;
275 case WPA_CIPHER_BIP_CMAC_256:
276 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_CMAC_256);
277 pos += RSN_SELECTOR_LEN;
278 break;
279 }
280 #endif /* CONFIG_IEEE80211W */
281
282 rsnie->len = (pos - (u8 *) rsnie) - 2;
283
284 /* MDIE */
285 mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
286 if (mdie_len <= 0) {
287 os_free(buf);
288 return NULL;
289 }
290 mdie = (struct rsn_mdie *) (pos + 2);
291 pos += mdie_len;
292
293 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
294 ftie_pos = pos;
295 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
296 ftie_len = pos++;
297 if (wpa_key_mgmt_sha384(sm->key_mgmt)) {
298 struct rsn_ftie_sha384 *ftie;
299
300 ftie = (struct rsn_ftie_sha384 *) pos;
301 fte_mic = ftie->mic;
302 elem_count = &ftie->mic_control[1];
303 pos += sizeof(*ftie);
304 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
305 if (anonce)
306 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
307 } else {
308 struct rsn_ftie *ftie;
309
310 ftie = (struct rsn_ftie *) pos;
311 fte_mic = ftie->mic;
312 elem_count = &ftie->mic_control[1];
313 pos += sizeof(*ftie);
314 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
315 if (anonce)
316 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
317 }
318 if (kck) {
319 /* R1KH-ID sub-element in third FT message */
320 *pos++ = FTIE_SUBELEM_R1KH_ID;
321 *pos++ = FT_R1KH_ID_LEN;
322 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
323 pos += FT_R1KH_ID_LEN;
324 }
325 /* R0KH-ID sub-element */
326 *pos++ = FTIE_SUBELEM_R0KH_ID;
327 *pos++ = sm->r0kh_id_len;
328 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
329 pos += sm->r0kh_id_len;
330 #ifdef CONFIG_OCV
331 if (kck && wpa_sm_ocv_enabled(sm)) {
332 /* OCI sub-element in the third FT message */
333 struct wpa_channel_info ci;
334
335 if (wpa_sm_channel_info(sm, &ci) != 0) {
336 wpa_printf(MSG_WARNING,
337 "Failed to get channel info for OCI element in FTE");
338 os_free(buf);
339 return NULL;
340 }
341
342 *pos++ = FTIE_SUBELEM_OCI;
343 *pos++ = OCV_OCI_LEN;
344 if (ocv_insert_oci(&ci, &pos) < 0) {
345 os_free(buf);
346 return NULL;
347 }
348 }
349 #endif /* CONFIG_OCV */
350 *ftie_len = pos - ftie_len - 1;
351
352 if (ric_ies) {
353 /* RIC Request */
354 os_memcpy(pos, ric_ies, ric_ies_len);
355 pos += ric_ies_len;
356 }
357
358 if (kck) {
359 /*
360 * IEEE Std 802.11r-2008, 11A.8.4
361 * MIC shall be calculated over:
362 * non-AP STA MAC address
363 * Target AP MAC address
364 * Transaction seq number (5 for ReassocReq, 3 otherwise)
365 * RSN IE
366 * MDIE
367 * FTIE (with MIC field set to 0)
368 * RIC-Request (if present)
369 */
370 /* Information element count */
371 *elem_count = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len);
372 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
373 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
374 ftie_pos, 2 + *ftie_len,
375 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
376 ric_ies_len, fte_mic) < 0) {
377 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
378 os_free(buf);
379 return NULL;
380 }
381 }
382
383 *len = pos - buf;
384
385 return buf;
386 }
387
388
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)389 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
390 {
391 int keylen;
392 enum wpa_alg alg;
393 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
394
395 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
396
397 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
398 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
399 sm->pairwise_cipher);
400 return -1;
401 }
402
403 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
404 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
405
406 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
407 sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
408 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
409 return -1;
410 }
411
412 return 0;
413 }
414
415
416 /**
417 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
418 * @sm: Pointer to WPA state machine data from wpa_sm_init()
419 * @mdie: Target AP MDIE
420 * Returns: 0 on success, -1 on failure
421 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)422 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
423 {
424 u8 *ft_ies;
425 size_t ft_ies_len;
426
427 /* Generate a new SNonce */
428 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
429 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
430 return -1;
431 }
432
433 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
434 NULL, 0, sm->bssid, NULL, 0, mdie);
435 if (ft_ies) {
436 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
437 ft_ies, ft_ies_len);
438 os_free(ft_ies);
439 }
440
441 return 0;
442 }
443
444
wpa_ft_add_mdie(struct wpa_sm * sm,u8 * buf,size_t buf_len,const u8 * ap_mdie)445 int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
446 const u8 *ap_mdie)
447 {
448 u8 *pos = buf;
449 struct rsn_mdie *mdie;
450
451 if (buf_len < 2 + sizeof(*mdie)) {
452 wpa_printf(MSG_INFO,
453 "FT: Failed to add MDIE: short buffer, length=%zu",
454 buf_len);
455 return 0;
456 }
457
458 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
459 *pos++ = sizeof(*mdie);
460 mdie = (struct rsn_mdie *) pos;
461 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
462 MOBILITY_DOMAIN_ID_LEN);
463 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
464 sm->mdie_ft_capab;
465
466 return 2 + sizeof(*mdie);
467 }
468
469
wpa_sm_get_ft_md(struct wpa_sm * sm)470 const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
471 {
472 return sm->mobility_domain;
473 }
474
475
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)476 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
477 int ft_action, const u8 *target_ap,
478 const u8 *ric_ies, size_t ric_ies_len)
479 {
480 u8 *ft_ies;
481 size_t ft_ies_len;
482 struct wpa_ft_ies parse;
483 struct rsn_mdie *mdie;
484 u8 ptk_name[WPA_PMK_NAME_LEN];
485 int ret;
486 const u8 *bssid;
487 const u8 *kck;
488 size_t kck_len;
489 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
490 const u8 *anonce, *snonce;
491
492 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
493 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
494
495 if (ft_action) {
496 if (!sm->over_the_ds_in_progress) {
497 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
498 "- drop FT Action Response");
499 return -1;
500 }
501
502 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
503 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
504 "with this Target AP - drop FT Action "
505 "Response");
506 return -1;
507 }
508 }
509
510 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
511 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
512 "enabled for this connection");
513 return -1;
514 }
515
516 if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
517 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
518 return -1;
519 }
520
521 mdie = (struct rsn_mdie *) parse.mdie;
522 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
523 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
524 MOBILITY_DOMAIN_ID_LEN) != 0) {
525 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
526 return -1;
527 }
528
529 if (use_sha384) {
530 struct rsn_ftie_sha384 *ftie;
531
532 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
533 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
534 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
535 return -1;
536 }
537
538 anonce = ftie->anonce;
539 snonce = ftie->snonce;
540 } else {
541 struct rsn_ftie *ftie;
542
543 ftie = (struct rsn_ftie *) parse.ftie;
544 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
545 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
546 return -1;
547 }
548
549 anonce = ftie->anonce;
550 snonce = ftie->snonce;
551 }
552
553 if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
554 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
555 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
556 snonce, WPA_NONCE_LEN);
557 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
558 sm->snonce, WPA_NONCE_LEN);
559 return -1;
560 }
561
562 if (parse.r0kh_id == NULL) {
563 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
564 return -1;
565 }
566
567 if (parse.r0kh_id_len != sm->r0kh_id_len ||
568 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
569 {
570 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
571 "the current R0KH-ID");
572 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
573 parse.r0kh_id, parse.r0kh_id_len);
574 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
575 sm->r0kh_id, sm->r0kh_id_len);
576 return -1;
577 }
578
579 if (parse.r1kh_id == NULL) {
580 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
581 return -1;
582 }
583
584 if (parse.rsn_pmkid == NULL ||
585 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
586 {
587 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
588 "RSNIE");
589 return -1;
590 }
591
592 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
593 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
594 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
595 wpa_hexdump(MSG_DEBUG, "FT: ANonce", anonce, WPA_NONCE_LEN);
596 os_memcpy(sm->anonce, anonce, WPA_NONCE_LEN);
597 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
598 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
599 sm->pmk_r1_name) < 0)
600 return -1;
601 sm->pmk_r1_len = sm->pmk_r0_len;
602 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, sm->pmk_r1_len);
603 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
604 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
605
606 bssid = target_ap;
607 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
608 anonce, sm->own_addr, bssid,
609 sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
610 sm->pairwise_cipher) < 0)
611 return -1;
612
613 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
614 kck = sm->ptk.kck2;
615 kck_len = sm->ptk.kck2_len;
616 } else {
617 kck = sm->ptk.kck;
618 kck_len = sm->ptk.kck_len;
619 }
620 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, anonce,
621 sm->pmk_r1_name,
622 kck, kck_len, bssid,
623 ric_ies, ric_ies_len,
624 parse.mdie ? parse.mdie - 2 : NULL);
625 if (ft_ies) {
626 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
627 ft_ies, ft_ies_len);
628 os_free(ft_ies);
629 }
630
631 wpa_sm_mark_authenticated(sm, bssid);
632 ret = wpa_ft_install_ptk(sm, bssid);
633 if (ret) {
634 /*
635 * Some drivers do not support key configuration when we are
636 * not associated with the target AP. Work around this by
637 * trying again after the following reassociation gets
638 * completed.
639 */
640 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
641 "association - try again after reassociation");
642 sm->set_ptk_after_assoc = 1;
643 } else
644 sm->set_ptk_after_assoc = 0;
645
646 sm->ft_completed = 1;
647 if (ft_action) {
648 /*
649 * The caller is expected trigger re-association with the
650 * Target AP.
651 */
652 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
653 }
654
655 return 0;
656 }
657
658
wpa_ft_is_completed(struct wpa_sm * sm)659 int wpa_ft_is_completed(struct wpa_sm *sm)
660 {
661 if (sm == NULL)
662 return 0;
663
664 if (!wpa_key_mgmt_ft(sm->key_mgmt))
665 return 0;
666
667 return sm->ft_completed;
668 }
669
670
wpa_reset_ft_completed(struct wpa_sm * sm)671 void wpa_reset_ft_completed(struct wpa_sm *sm)
672 {
673 if (sm != NULL)
674 sm->ft_completed = 0;
675 }
676
677
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)678 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
679 size_t gtk_elem_len)
680 {
681 u8 gtk[32];
682 int keyidx;
683 enum wpa_alg alg;
684 size_t gtk_len, keylen, rsc_len;
685 const u8 *kek;
686 size_t kek_len;
687
688 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
689 kek = sm->ptk.kek2;
690 kek_len = sm->ptk.kek2_len;
691 } else {
692 kek = sm->ptk.kek;
693 kek_len = sm->ptk.kek_len;
694 }
695
696 if (gtk_elem == NULL) {
697 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
698 return 0;
699 }
700
701 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
702 gtk_elem, gtk_elem_len);
703
704 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
705 gtk_elem_len - 19 > sizeof(gtk)) {
706 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
707 "length %lu", (unsigned long) gtk_elem_len);
708 return -1;
709 }
710 gtk_len = gtk_elem_len - 19;
711 if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
712 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
713 "decrypt GTK");
714 return -1;
715 }
716
717 keylen = wpa_cipher_key_len(sm->group_cipher);
718 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
719 alg = wpa_cipher_to_alg(sm->group_cipher);
720 if (alg == WPA_ALG_NONE) {
721 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
722 sm->group_cipher);
723 return -1;
724 }
725
726 if (gtk_len < keylen) {
727 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
728 return -1;
729 }
730
731 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
732
733 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
734
735 if (gtk_elem[2] != keylen) {
736 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
737 "negotiated %lu",
738 gtk_elem[2], (unsigned long) keylen);
739 return -1;
740 }
741
742 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
743 if (sm->group_cipher == WPA_CIPHER_TKIP) {
744 /* Swap Tx/Rx keys for Michael MIC */
745 u8 tmp[8];
746 os_memcpy(tmp, gtk + 16, 8);
747 os_memcpy(gtk + 16, gtk + 24, 8);
748 os_memcpy(gtk + 24, tmp, 8);
749 }
750 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
751 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
752 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
753 "driver.");
754 return -1;
755 }
756
757 return 0;
758 }
759
760
761 #ifdef CONFIG_IEEE80211W
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)762 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
763 size_t igtk_elem_len)
764 {
765 u8 igtk[WPA_IGTK_MAX_LEN];
766 size_t igtk_len;
767 u16 keyidx;
768 const u8 *kek;
769 size_t kek_len;
770
771 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
772 kek = sm->ptk.kek2;
773 kek_len = sm->ptk.kek2_len;
774 } else {
775 kek = sm->ptk.kek;
776 kek_len = sm->ptk.kek_len;
777 }
778
779 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
780 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
781 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
782 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
783 return 0;
784
785 if (igtk_elem == NULL) {
786 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
787 return 0;
788 }
789
790 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
791 igtk_elem, igtk_elem_len);
792
793 igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
794 if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
795 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
796 "length %lu", (unsigned long) igtk_elem_len);
797 return -1;
798 }
799 if (igtk_elem[8] != igtk_len) {
800 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
801 "%d", igtk_elem[8]);
802 return -1;
803 }
804
805 if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
806 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
807 "decrypt IGTK");
808 return -1;
809 }
810
811 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
812
813 keyidx = WPA_GET_LE16(igtk_elem);
814
815 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
816 igtk_len);
817 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
818 broadcast_ether_addr, keyidx, 0,
819 igtk_elem + 2, 6, igtk, igtk_len) < 0) {
820 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
821 "driver.");
822 os_memset(igtk, 0, sizeof(igtk));
823 return -1;
824 }
825 os_memset(igtk, 0, sizeof(igtk));
826
827 return 0;
828 }
829 #endif /* CONFIG_IEEE80211W */
830
831
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)832 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
833 size_t ies_len, const u8 *src_addr)
834 {
835 struct wpa_ft_ies parse;
836 struct rsn_mdie *mdie;
837 unsigned int count;
838 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
839 const u8 *kck;
840 size_t kck_len;
841 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
842 const u8 *anonce, *snonce, *fte_mic;
843 u8 fte_elem_count;
844
845 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
846
847 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
848 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
849 "enabled for this connection");
850 return -1;
851 }
852
853 if (sm->ft_reassoc_completed) {
854 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
855 return 0;
856 }
857
858 if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
859 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
860 return -1;
861 }
862
863 mdie = (struct rsn_mdie *) parse.mdie;
864 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
865 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
866 MOBILITY_DOMAIN_ID_LEN) != 0) {
867 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
868 return -1;
869 }
870
871 if (use_sha384) {
872 struct rsn_ftie_sha384 *ftie;
873
874 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
875 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
876 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
877 return -1;
878 }
879
880 anonce = ftie->anonce;
881 snonce = ftie->snonce;
882 fte_elem_count = ftie->mic_control[1];
883 fte_mic = ftie->mic;
884 } else {
885 struct rsn_ftie *ftie;
886
887 ftie = (struct rsn_ftie *) parse.ftie;
888 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
889 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
890 return -1;
891 }
892
893 anonce = ftie->anonce;
894 snonce = ftie->snonce;
895 fte_elem_count = ftie->mic_control[1];
896 fte_mic = ftie->mic;
897 }
898
899 if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
900 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
901 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
902 snonce, WPA_NONCE_LEN);
903 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
904 sm->snonce, WPA_NONCE_LEN);
905 return -1;
906 }
907
908 if (os_memcmp(anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
909 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
910 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
911 anonce, WPA_NONCE_LEN);
912 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
913 sm->anonce, WPA_NONCE_LEN);
914 return -1;
915 }
916
917 if (parse.r0kh_id == NULL) {
918 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
919 return -1;
920 }
921
922 if (parse.r0kh_id_len != sm->r0kh_id_len ||
923 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
924 {
925 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
926 "the current R0KH-ID");
927 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
928 parse.r0kh_id, parse.r0kh_id_len);
929 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
930 sm->r0kh_id, sm->r0kh_id_len);
931 return -1;
932 }
933
934 if (parse.r1kh_id == NULL) {
935 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
936 return -1;
937 }
938
939 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
940 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
941 "ReassocResp");
942 return -1;
943 }
944
945 if (parse.rsn_pmkid == NULL ||
946 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
947 {
948 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
949 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
950 return -1;
951 }
952
953 count = 3;
954 if (parse.ric)
955 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
956 if (fte_elem_count != count) {
957 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
958 "Control: received %u expected %u",
959 fte_elem_count, count);
960 return -1;
961 }
962
963 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
964 kck = sm->ptk.kck2;
965 kck_len = sm->ptk.kck2_len;
966 } else {
967 kck = sm->ptk.kck;
968 kck_len = sm->ptk.kck_len;
969 }
970
971 if (wpa_ft_mic(kck, kck_len, sm->own_addr, src_addr, 6,
972 parse.mdie - 2, parse.mdie_len + 2,
973 parse.ftie - 2, parse.ftie_len + 2,
974 parse.rsn - 2, parse.rsn_len + 2,
975 parse.ric, parse.ric_len,
976 mic) < 0) {
977 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
978 return -1;
979 }
980
981 if (os_memcmp_const(mic, fte_mic, 16) != 0) {
982 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
983 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", fte_mic, 16);
984 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
985 return -1;
986 }
987
988 #ifdef CONFIG_OCV
989 if (wpa_sm_ocv_enabled(sm)) {
990 struct wpa_channel_info ci;
991
992 if (wpa_sm_channel_info(sm, &ci) != 0) {
993 wpa_printf(MSG_WARNING,
994 "Failed to get channel info to validate received OCI in (Re)Assoc Response");
995 return -1;
996 }
997
998 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
999 channel_width_to_int(ci.chanwidth),
1000 ci.seg1_idx) != 0) {
1001 wpa_printf(MSG_WARNING, "%s", ocv_errorstr);
1002 return -1;
1003 }
1004 }
1005 #endif /* CONFIG_OCV */
1006
1007 sm->ft_reassoc_completed = 1;
1008
1009 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
1010 return -1;
1011
1012 #ifdef CONFIG_IEEE80211W
1013 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
1014 return -1;
1015 #endif /* CONFIG_IEEE80211W */
1016
1017 if (sm->set_ptk_after_assoc) {
1018 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
1019 "are associated");
1020 if (wpa_ft_install_ptk(sm, src_addr) < 0)
1021 return -1;
1022 sm->set_ptk_after_assoc = 0;
1023 }
1024
1025 if (parse.ric) {
1026 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
1027 parse.ric, parse.ric_len);
1028 /* TODO: parse response and inform driver about results when
1029 * using wpa_supplicant SME */
1030 }
1031
1032 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
1033
1034 return 0;
1035 }
1036
1037
1038 /**
1039 * wpa_ft_start_over_ds - Generate over-the-DS auth request
1040 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1041 * @target_ap: Target AP Address
1042 * @mdie: Mobility Domain IE from the target AP
1043 * Returns: 0 on success, -1 on failure
1044 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie)1045 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1046 const u8 *mdie)
1047 {
1048 u8 *ft_ies;
1049 size_t ft_ies_len;
1050
1051 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1052 MAC2STR(target_ap));
1053
1054 /* Generate a new SNonce */
1055 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1056 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1057 return -1;
1058 }
1059
1060 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1061 NULL, 0, target_ap, NULL, 0, mdie);
1062 if (ft_ies) {
1063 sm->over_the_ds_in_progress = 1;
1064 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1065 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1066 os_free(ft_ies);
1067 }
1068
1069 return 0;
1070 }
1071
1072 #endif /* CONFIG_IEEE80211R */
1073