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/sha512.h"
15 #include "crypto/random.h"
16 #include "common/ieee802_11_defs.h"
17 #include "common/ieee802_11_common.h"
18 #include "common/ocv.h"
19 #include "common/wpa_ctrl.h"
20 #include "drivers/driver.h"
21 #include "wpa.h"
22 #include "wpa_i.h"
23 #include "wpa_ie.h"
24 #include "pmksa_cache.h"
25
26 #ifdef CONFIG_IEEE80211R
27
28 #ifdef CONFIG_PASN
29 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid);
30 #else /* CONFIG_PASN */
wpa_ft_pasn_store_r1kh(struct wpa_sm * sm,const u8 * bssid)31 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid)
32 {
33 }
34 #endif /* CONFIG_PASN */
35
36
wpa_derive_ptk_ft(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)37 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
38 const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
39 {
40 u8 ptk_name[WPA_PMK_NAME_LEN];
41 const u8 *anonce = key->key_nonce;
42 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
43 const u8 *mpmk;
44 size_t mpmk_len, kdk_len;
45 int ret = 0;
46
47 if (sm->xxkey_len > 0) {
48 mpmk = sm->xxkey;
49 mpmk_len = sm->xxkey_len;
50 } else if (sm->cur_pmksa) {
51 mpmk = sm->cur_pmksa->pmk;
52 mpmk_len = sm->cur_pmksa->pmk_len;
53 } else {
54 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
55 "derivation");
56 return -1;
57 }
58
59 if (wpa_key_mgmt_sae_ext_key(sm->key_mgmt))
60 sm->pmk_r0_len = mpmk_len;
61 else
62 sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
63 if (wpa_derive_pmk_r0(mpmk, mpmk_len, sm->ssid,
64 sm->ssid_len, sm->mobility_domain,
65 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
66 sm->pmk_r0, sm->pmk_r0_name, sm->key_mgmt) < 0)
67 return -1;
68 sm->pmk_r1_len = sm->pmk_r0_len;
69 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
70 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
71 sm->pmk_r1_name) < 0)
72 return -1;
73
74 wpa_ft_pasn_store_r1kh(sm, src_addr);
75
76 if (sm->force_kdk_derivation ||
77 (sm->secure_ltf &&
78 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF)))
79 kdk_len = WPA_KDK_MAX_LEN;
80 else
81 kdk_len = 0;
82
83 ret = wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
84 anonce, sm->own_addr, wpa_sm_get_auth_addr(sm),
85 sm->pmk_r1_name, ptk, ptk_name, sm->key_mgmt,
86 sm->pairwise_cipher, kdk_len);
87 if (ret) {
88 wpa_printf(MSG_ERROR, "FT: PTK derivation failed");
89 return ret;
90 }
91
92 os_memcpy(sm->key_mobility_domain, sm->mobility_domain,
93 MOBILITY_DOMAIN_ID_LEN);
94
95 #ifdef CONFIG_PASN
96 if (sm->secure_ltf &&
97 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF))
98 ret = wpa_ltf_keyseed(ptk, sm->key_mgmt, sm->pairwise_cipher);
99 #endif /* CONFIG_PASN */
100
101 return ret;
102 }
103
104
105 /**
106 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
107 * @sm: Pointer to WPA state machine data from wpa_sm_init()
108 * @ies: Association Response IEs or %NULL to clear FT parameters
109 * @ies_len: Length of ies buffer in octets
110 * Returns: 0 on success, -1 on failure
111 */
wpa_sm_set_ft_params(struct wpa_sm * sm,const u8 * ies,size_t ies_len)112 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
113 {
114 struct wpa_ft_ies ft;
115
116 if (sm == NULL)
117 return 0;
118
119 if (!get_ie(ies, ies_len, WLAN_EID_MOBILITY_DOMAIN)) {
120 os_free(sm->assoc_resp_ies);
121 sm->assoc_resp_ies = NULL;
122 sm->assoc_resp_ies_len = 0;
123 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
124 os_memset(sm->r0kh_id, 0, FT_R0KH_ID_MAX_LEN);
125 sm->r0kh_id_len = 0;
126 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
127 return 0;
128 }
129
130 if (wpa_ft_parse_ies(ies, ies_len, &ft, sm->key_mgmt) < 0)
131 return -1;
132
133 if (ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
134 return -1;
135
136 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
137 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
138 os_memcpy(sm->mobility_domain, ft.mdie, MOBILITY_DOMAIN_ID_LEN);
139 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
140 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
141 sm->mdie_ft_capab);
142
143 if (ft.r0kh_id) {
144 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
145 ft.r0kh_id, ft.r0kh_id_len);
146 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
147 sm->r0kh_id_len = ft.r0kh_id_len;
148 } else {
149 /* FIX: When should R0KH-ID be cleared? We need to keep the
150 * old R0KH-ID in order to be able to use this during FT. */
151 /*
152 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
153 * sm->r0kh_id_len = 0;
154 */
155 }
156
157 if (ft.r1kh_id) {
158 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
159 ft.r1kh_id, FT_R1KH_ID_LEN);
160 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
161 } else
162 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
163
164 os_free(sm->assoc_resp_ies);
165 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
166 if (sm->assoc_resp_ies) {
167 u8 *pos = sm->assoc_resp_ies;
168
169 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
170 pos += ft.mdie_len + 2;
171
172 if (ft.ftie) {
173 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
174 pos += ft.ftie_len + 2;
175 }
176 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
177 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
178 "(Re)Association Response",
179 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
180 }
181
182 return 0;
183 }
184
185
186 /**
187 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
188 * @sm: Pointer to WPA state machine data from wpa_sm_init()
189 * @len: Buffer for returning the length of the IEs
190 * @anonce: ANonce or %NULL if not yet available
191 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
192 * @kck: KCK for MIC or %NULL if no MIC is used
193 * @kck_len: KCK length in octets
194 * @target_ap: Target AP address
195 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
196 * @ric_ies_len: Length of ric_ies buffer in octets
197 * @ap_mdie: Mobility Domain IE from the target AP
198 * @omit_rsnxe: Whether RSNXE is omitted from Reassociation Request frame
199 * Returns: Pointer to buffer with IEs or %NULL on failure
200 *
201 * Caller is responsible for freeing the returned buffer with os_free();
202 */
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)203 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
204 const u8 *anonce, const u8 *pmk_name,
205 const u8 *kck, size_t kck_len,
206 const u8 *target_ap,
207 const u8 *ric_ies, size_t ric_ies_len,
208 const u8 *ap_mdie, int omit_rsnxe)
209 {
210 size_t buf_len;
211 u8 *buf, *pos, *ftie_len, *ftie_pos, *fte_mic, *elem_count;
212 struct rsn_mdie *mdie;
213 struct rsn_ie_hdr *rsnie;
214 int mdie_len;
215 u8 rsnxe[10];
216 size_t rsnxe_len;
217 int rsnxe_used;
218 int res;
219 u8 mic_control;
220
221 sm->ft_completed = 0;
222 sm->ft_reassoc_completed = 0;
223
224 buf_len = 2 + sizeof(struct rsn_mdie) + 2 +
225 sizeof(struct rsn_ftie_sha512) +
226 2 + sm->r0kh_id_len + ric_ies_len + 100;
227 buf = os_zalloc(buf_len);
228 if (buf == NULL)
229 return NULL;
230 pos = buf;
231
232 /* RSNIE[PMKR0Name/PMKR1Name] */
233 rsnie = (struct rsn_ie_hdr *) pos;
234 rsnie->elem_id = WLAN_EID_RSN;
235 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
236 pos = (u8 *) (rsnie + 1);
237
238 /* Group Suite Selector */
239 if (!wpa_cipher_valid_group(sm->group_cipher)) {
240 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
241 sm->group_cipher);
242 os_free(buf);
243 return NULL;
244 }
245 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
246 sm->group_cipher));
247 pos += RSN_SELECTOR_LEN;
248
249 /* Pairwise Suite Count */
250 WPA_PUT_LE16(pos, 1);
251 pos += 2;
252
253 /* Pairwise Suite List */
254 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
255 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
256 sm->pairwise_cipher);
257 os_free(buf);
258 return NULL;
259 }
260 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
261 sm->pairwise_cipher));
262 pos += RSN_SELECTOR_LEN;
263
264 /* Authenticated Key Management Suite Count */
265 WPA_PUT_LE16(pos, 1);
266 pos += 2;
267
268 /* Authenticated Key Management Suite List */
269 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
270 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
271 #ifdef CONFIG_SHA384
272 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
273 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
274 #endif /* CONFIG_SHA384 */
275 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
276 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
277 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
278 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
279 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY)
280 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE_EXT_KEY);
281 #ifdef CONFIG_FILS
282 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
283 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
284 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
285 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
286 #endif /* CONFIG_FILS */
287 else {
288 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
289 sm->key_mgmt);
290 os_free(buf);
291 return NULL;
292 }
293 pos += RSN_SELECTOR_LEN;
294
295 /* RSN Capabilities */
296 WPA_PUT_LE16(pos, rsn_supp_capab(sm));
297 pos += 2;
298
299 /* PMKID Count */
300 WPA_PUT_LE16(pos, 1);
301 pos += 2;
302
303 /* PMKID List [PMKR0Name/PMKR1Name] */
304 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
305 pos += WPA_PMK_NAME_LEN;
306
307 /* Management Group Cipher Suite */
308 switch (sm->mgmt_group_cipher) {
309 case WPA_CIPHER_AES_128_CMAC:
310 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
311 pos += RSN_SELECTOR_LEN;
312 break;
313 case WPA_CIPHER_BIP_GMAC_128:
314 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_128);
315 pos += RSN_SELECTOR_LEN;
316 break;
317 case WPA_CIPHER_BIP_GMAC_256:
318 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_256);
319 pos += RSN_SELECTOR_LEN;
320 break;
321 case WPA_CIPHER_BIP_CMAC_256:
322 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_CMAC_256);
323 pos += RSN_SELECTOR_LEN;
324 break;
325 }
326
327 rsnie->len = (pos - (u8 *) rsnie) - 2;
328
329 /* MDIE */
330 mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
331 if (mdie_len <= 0) {
332 os_free(buf);
333 return NULL;
334 }
335 mdie = (struct rsn_mdie *) (pos + 2);
336 pos += mdie_len;
337
338 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
339 ftie_pos = pos;
340 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
341 ftie_len = pos++;
342 rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) && anonce &&
343 (sm->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
344 sm->sae_pwe == SAE_PWE_BOTH);
345 #ifdef CONFIG_TESTING_OPTIONS
346 if (anonce && sm->ft_rsnxe_used) {
347 rsnxe_used = sm->ft_rsnxe_used == 1;
348 wpa_printf(MSG_DEBUG, "TESTING: FT: Force RSNXE Used %d",
349 rsnxe_used);
350 }
351 #endif /* CONFIG_TESTING_OPTIONS */
352 mic_control = rsnxe_used ? FTE_MIC_CTRL_RSNXE_USED : 0;
353 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
354 sm->pmk_r0_len == SHA512_MAC_LEN) {
355 struct rsn_ftie_sha512 *ftie;
356
357 ftie = (struct rsn_ftie_sha512 *) pos;
358 mic_control |= FTE_MIC_LEN_32 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
359 ftie->mic_control[0] = mic_control;
360 fte_mic = ftie->mic;
361 elem_count = &ftie->mic_control[1];
362 pos += sizeof(*ftie);
363 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
364 if (anonce)
365 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
366 } else if ((sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
367 sm->pmk_r0_len == SHA384_MAC_LEN) ||
368 wpa_key_mgmt_sha384(sm->key_mgmt)) {
369 struct rsn_ftie_sha384 *ftie;
370
371 ftie = (struct rsn_ftie_sha384 *) pos;
372 mic_control |= FTE_MIC_LEN_24 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
373 ftie->mic_control[0] = mic_control;
374 fte_mic = ftie->mic;
375 elem_count = &ftie->mic_control[1];
376 pos += sizeof(*ftie);
377 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
378 if (anonce)
379 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
380 } else {
381 struct rsn_ftie *ftie;
382
383 ftie = (struct rsn_ftie *) pos;
384 mic_control |= FTE_MIC_LEN_16 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
385 ftie->mic_control[0] = mic_control;
386 fte_mic = ftie->mic;
387 elem_count = &ftie->mic_control[1];
388 pos += sizeof(*ftie);
389 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
390 if (anonce)
391 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
392 }
393 if (kck) {
394 /* R1KH-ID sub-element in third FT message */
395 *pos++ = FTIE_SUBELEM_R1KH_ID;
396 *pos++ = FT_R1KH_ID_LEN;
397 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
398 pos += FT_R1KH_ID_LEN;
399 }
400 /* R0KH-ID sub-element */
401 *pos++ = FTIE_SUBELEM_R0KH_ID;
402 *pos++ = sm->r0kh_id_len;
403 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
404 pos += sm->r0kh_id_len;
405 #ifdef CONFIG_OCV
406 if (kck && wpa_sm_ocv_enabled(sm)) {
407 /* OCI sub-element in the third FT message */
408 struct wpa_channel_info ci;
409
410 if (wpa_sm_channel_info(sm, &ci) != 0) {
411 wpa_printf(MSG_WARNING,
412 "Failed to get channel info for OCI element in FTE");
413 os_free(buf);
414 return NULL;
415 }
416 #ifdef CONFIG_TESTING_OPTIONS
417 if (sm->oci_freq_override_ft_assoc) {
418 wpa_printf(MSG_INFO,
419 "TEST: Override OCI KDE frequency %d -> %d MHz",
420 ci.frequency, sm->oci_freq_override_ft_assoc);
421 ci.frequency = sm->oci_freq_override_ft_assoc;
422 }
423 #endif /* CONFIG_TESTING_OPTIONS */
424
425 *pos++ = FTIE_SUBELEM_OCI;
426 *pos++ = OCV_OCI_LEN;
427 if (ocv_insert_oci(&ci, &pos) < 0) {
428 os_free(buf);
429 return NULL;
430 }
431 }
432 #endif /* CONFIG_OCV */
433 *ftie_len = pos - ftie_len - 1;
434
435 if (ric_ies) {
436 /* RIC Request */
437 os_memcpy(pos, ric_ies, ric_ies_len);
438 pos += ric_ies_len;
439 }
440
441 if (omit_rsnxe) {
442 rsnxe_len = 0;
443 } else {
444 res = wpa_gen_rsnxe(sm, rsnxe, sizeof(rsnxe));
445 if (res < 0) {
446 os_free(buf);
447 return NULL;
448 }
449 rsnxe_len = res;
450 }
451
452 if (kck) {
453 /*
454 * IEEE Std 802.11r-2008, 11A.8.4
455 * MIC shall be calculated over:
456 * non-AP STA MAC address
457 * Target AP MAC address
458 * Transaction seq number (5 for ReassocReq, 3 otherwise)
459 * RSN IE
460 * MDIE
461 * FTIE (with MIC field set to 0)
462 * RIC-Request (if present)
463 * RSNXE (if present)
464 */
465 /* Information element count */
466 *elem_count = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len);
467 if (rsnxe_len)
468 *elem_count += 1;
469 if (wpa_ft_mic(sm->key_mgmt, kck, kck_len,
470 sm->own_addr, target_ap, 5,
471 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
472 ftie_pos, 2 + *ftie_len,
473 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
474 ric_ies_len, rsnxe_len ? rsnxe : NULL, rsnxe_len,
475 fte_mic) < 0) {
476 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
477 os_free(buf);
478 return NULL;
479 }
480 }
481
482 *len = pos - buf;
483
484 return buf;
485 }
486
487
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)488 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
489 {
490 int keylen;
491 enum wpa_alg alg;
492 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
493
494 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
495
496 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
497 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
498 sm->pairwise_cipher);
499 return -1;
500 }
501
502 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
503 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
504
505 /* TODO: AP MLD address for MLO */
506 if (wpa_sm_set_key(sm, -1, alg, bssid, 0, 1, null_rsc, sizeof(null_rsc),
507 (u8 *) sm->ptk.tk, keylen,
508 KEY_FLAG_PAIRWISE_RX_TX) < 0) {
509 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
510 return -1;
511 }
512 sm->tk_set = true;
513
514 wpa_sm_store_ptk(sm, bssid, sm->pairwise_cipher,
515 sm->dot11RSNAConfigPMKLifetime, &sm->ptk);
516 return 0;
517 }
518
519
520 /**
521 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
522 * @sm: Pointer to WPA state machine data from wpa_sm_init()
523 * @mdie: Target AP MDIE
524 * Returns: 0 on success, -1 on failure
525 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)526 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
527 {
528 u8 *ft_ies;
529 size_t ft_ies_len;
530
531 /* Generate a new SNonce */
532 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
533 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
534 return -1;
535 }
536
537 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
538 NULL, 0, sm->bssid, NULL, 0, mdie, 0);
539 if (ft_ies) {
540 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
541 ft_ies, ft_ies_len);
542 os_free(ft_ies);
543 }
544
545 return 0;
546 }
547
548
wpa_ft_add_mdie(struct wpa_sm * sm,u8 * buf,size_t buf_len,const u8 * ap_mdie)549 int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
550 const u8 *ap_mdie)
551 {
552 u8 *pos = buf;
553 struct rsn_mdie *mdie;
554
555 if (buf_len < 2 + sizeof(*mdie)) {
556 wpa_printf(MSG_INFO,
557 "FT: Failed to add MDIE: short buffer, length=%zu",
558 buf_len);
559 return 0;
560 }
561
562 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
563 *pos++ = sizeof(*mdie);
564 mdie = (struct rsn_mdie *) pos;
565 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
566 MOBILITY_DOMAIN_ID_LEN);
567 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
568 sm->mdie_ft_capab;
569
570 return 2 + sizeof(*mdie);
571 }
572
573
wpa_sm_get_ft_md(struct wpa_sm * sm)574 const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
575 {
576 return sm->mobility_domain;
577 }
578
579
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)580 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
581 int ft_action, const u8 *target_ap,
582 const u8 *ric_ies, size_t ric_ies_len)
583 {
584 u8 *ft_ies;
585 size_t ft_ies_len;
586 struct wpa_ft_ies parse;
587 struct rsn_mdie *mdie;
588 u8 ptk_name[WPA_PMK_NAME_LEN];
589 int ret;
590 const u8 *bssid;
591 const u8 *kck;
592 size_t kck_len, kdk_len;
593
594 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
595 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
596
597 if (ft_action) {
598 if (!sm->over_the_ds_in_progress) {
599 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
600 "- drop FT Action Response");
601 return -1;
602 }
603
604 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
605 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
606 "with this Target AP - drop FT Action "
607 "Response");
608 return -1;
609 }
610 }
611
612 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
613 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
614 "enabled for this connection");
615 return -1;
616 }
617
618 if (wpa_ft_parse_ies(ies, ies_len, &parse, sm->key_mgmt) < 0) {
619 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
620 return -1;
621 }
622
623 mdie = (struct rsn_mdie *) parse.mdie;
624 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
625 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
626 MOBILITY_DOMAIN_ID_LEN) != 0) {
627 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
628 return -1;
629 }
630
631 if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce) {
632 wpa_printf(MSG_DEBUG, "FT: Invalid FTE");
633 return -1;
634 }
635
636 if (os_memcmp(parse.fte_snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
637 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
638 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
639 parse.fte_snonce, WPA_NONCE_LEN);
640 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
641 sm->snonce, WPA_NONCE_LEN);
642 return -1;
643 }
644
645 if (parse.r0kh_id == NULL) {
646 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
647 return -1;
648 }
649
650 if (parse.r0kh_id_len != sm->r0kh_id_len ||
651 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
652 {
653 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
654 "the current R0KH-ID");
655 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
656 parse.r0kh_id, parse.r0kh_id_len);
657 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
658 sm->r0kh_id, sm->r0kh_id_len);
659 return -1;
660 }
661
662 if (parse.r1kh_id == NULL) {
663 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
664 return -1;
665 }
666
667 if (parse.rsn_pmkid == NULL ||
668 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
669 {
670 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
671 "RSNIE");
672 return -1;
673 }
674
675 if (sm->mfp == 2 && !(parse.rsn_capab & WPA_CAPABILITY_MFPC)) {
676 wpa_printf(MSG_INFO,
677 "FT: Target AP does not support PMF, but local configuration requires that");
678 return -1;
679 }
680
681 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
682 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
683 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
684 wpa_hexdump(MSG_DEBUG, "FT: ANonce", parse.fte_anonce, WPA_NONCE_LEN);
685 os_memcpy(sm->anonce, parse.fte_anonce, WPA_NONCE_LEN);
686 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
687 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
688 sm->pmk_r1_name) < 0)
689 return -1;
690 sm->pmk_r1_len = sm->pmk_r0_len;
691
692 bssid = target_ap;
693
694 wpa_ft_pasn_store_r1kh(sm, bssid);
695
696 if (sm->force_kdk_derivation ||
697 (sm->secure_ltf &&
698 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF)))
699 kdk_len = WPA_KDK_MAX_LEN;
700 else
701 kdk_len = 0;
702
703 /* TODO: AP MLD address for MLO */
704 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
705 parse.fte_anonce, sm->own_addr, bssid,
706 sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
707 sm->pairwise_cipher,
708 kdk_len) < 0)
709 return -1;
710
711 os_memcpy(sm->key_mobility_domain, sm->mobility_domain,
712 MOBILITY_DOMAIN_ID_LEN);
713
714 #ifdef CONFIG_PASN
715 if (sm->secure_ltf &&
716 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF) &&
717 wpa_ltf_keyseed(&sm->ptk, sm->key_mgmt, sm->pairwise_cipher)) {
718 wpa_printf(MSG_DEBUG, "FT: Failed to derive LTF keyseed");
719 return -1;
720 }
721 #endif /* CONFIG_PASN */
722
723 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
724 kck = sm->ptk.kck2;
725 kck_len = sm->ptk.kck2_len;
726 } else {
727 kck = sm->ptk.kck;
728 kck_len = sm->ptk.kck_len;
729 }
730 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, parse.fte_anonce,
731 sm->pmk_r1_name,
732 kck, kck_len, bssid,
733 ric_ies, ric_ies_len,
734 parse.mdie ? parse.mdie - 2 : NULL,
735 !sm->ap_rsnxe);
736 if (ft_ies) {
737 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
738 ft_ies, ft_ies_len);
739 os_free(ft_ies);
740 }
741
742 wpa_sm_mark_authenticated(sm, bssid);
743 ret = wpa_ft_install_ptk(sm, bssid);
744 if (ret) {
745 /*
746 * Some drivers do not support key configuration when we are
747 * not associated with the target AP. Work around this by
748 * trying again after the following reassociation gets
749 * completed.
750 */
751 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
752 "association - try again after reassociation");
753 sm->set_ptk_after_assoc = 1;
754 } else
755 sm->set_ptk_after_assoc = 0;
756
757 sm->ft_completed = 1;
758 if (ft_action) {
759 /*
760 * The caller is expected trigger re-association with the
761 * Target AP.
762 */
763 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
764 }
765
766 return 0;
767 }
768
769
wpa_ft_is_completed(struct wpa_sm * sm)770 int wpa_ft_is_completed(struct wpa_sm *sm)
771 {
772 if (sm == NULL)
773 return 0;
774
775 if (!wpa_key_mgmt_ft(sm->key_mgmt))
776 return 0;
777
778 return sm->ft_completed;
779 }
780
781 #if defined(CONFIG_DRIVER_NL80211_BRCM) || defined(CONFIG_DRIVER_NL80211_SYNA)
wpa_ft_is_ft_protocol(struct wpa_sm * sm)782 int wpa_ft_is_ft_protocol(struct wpa_sm *sm)
783 {
784 if (sm == NULL)
785 return 0;
786
787 if (!wpa_key_mgmt_ft(sm->key_mgmt))
788 return 0;
789
790 return sm->ft_protocol;
791 }
792 #endif /* CONFIG_DRIVER_NL80211_BRCM || CONFIG_DRIVER_NL80211_SYNA */
793
wpa_reset_ft_completed(struct wpa_sm * sm)794 void wpa_reset_ft_completed(struct wpa_sm *sm)
795 {
796 if (sm != NULL)
797 sm->ft_completed = 0;
798 }
799
800
wpa_set_ft_completed(struct wpa_sm * sm)801 void wpa_set_ft_completed(struct wpa_sm *sm)
802 {
803 if (sm != NULL)
804 sm->ft_completed = 1;
805 }
806
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)807 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
808 size_t gtk_elem_len)
809 {
810 u8 gtk[32];
811 int keyidx;
812 enum wpa_alg alg;
813 size_t gtk_len, keylen, rsc_len;
814 const u8 *kek;
815 size_t kek_len;
816
817 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
818 kek = sm->ptk.kek2;
819 kek_len = sm->ptk.kek2_len;
820 } else {
821 kek = sm->ptk.kek;
822 kek_len = sm->ptk.kek_len;
823 }
824
825 if (gtk_elem == NULL) {
826 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
827 return 0;
828 }
829
830 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
831 gtk_elem, gtk_elem_len);
832
833 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
834 gtk_elem_len - 19 > sizeof(gtk)) {
835 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
836 "length %lu", (unsigned long) gtk_elem_len);
837 return -1;
838 }
839 gtk_len = gtk_elem_len - 19;
840 if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
841 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
842 "decrypt GTK");
843 return -1;
844 }
845
846 keylen = wpa_cipher_key_len(sm->group_cipher);
847 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
848 alg = wpa_cipher_to_alg(sm->group_cipher);
849 if (alg == WPA_ALG_NONE) {
850 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
851 sm->group_cipher);
852 return -1;
853 }
854
855 if (gtk_len < keylen) {
856 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
857 return -1;
858 }
859
860 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
861
862 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
863
864 if (gtk_elem[2] != keylen) {
865 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
866 "negotiated %lu",
867 gtk_elem[2], (unsigned long) keylen);
868 return -1;
869 }
870
871 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
872 if (sm->group_cipher == WPA_CIPHER_TKIP) {
873 /* Swap Tx/Rx keys for Michael MIC */
874 u8 tmp[8];
875 os_memcpy(tmp, gtk + 16, 8);
876 os_memcpy(gtk + 16, gtk + 24, 8);
877 os_memcpy(gtk + 24, tmp, 8);
878 }
879 if (wpa_sm_set_key(sm, -1, alg, broadcast_ether_addr, keyidx, 0,
880 gtk_elem + 3, rsc_len, gtk, keylen,
881 KEY_FLAG_GROUP_RX) < 0) {
882 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
883 "driver.");
884 return -1;
885 }
886
887 return 0;
888 }
889
890
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)891 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
892 size_t igtk_elem_len)
893 {
894 u8 igtk[WPA_IGTK_MAX_LEN];
895 size_t igtk_len;
896 u16 keyidx;
897 const u8 *kek;
898 size_t kek_len;
899
900 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
901 kek = sm->ptk.kek2;
902 kek_len = sm->ptk.kek2_len;
903 } else {
904 kek = sm->ptk.kek;
905 kek_len = sm->ptk.kek_len;
906 }
907
908 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
909 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
910 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
911 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
912 return 0;
913
914 if (igtk_elem == NULL) {
915 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
916 return 0;
917 }
918
919 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
920 igtk_elem, igtk_elem_len);
921
922 igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
923 if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
924 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
925 "length %lu", (unsigned long) igtk_elem_len);
926 return -1;
927 }
928 if (igtk_elem[8] != igtk_len) {
929 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
930 "%d", igtk_elem[8]);
931 return -1;
932 }
933
934 if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
935 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
936 "decrypt IGTK");
937 return -1;
938 }
939
940 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
941
942 keyidx = WPA_GET_LE16(igtk_elem);
943
944 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
945 igtk_len);
946 if (wpa_sm_set_key(sm, -1, wpa_cipher_to_alg(sm->mgmt_group_cipher),
947 broadcast_ether_addr, keyidx, 0,
948 igtk_elem + 2, 6, igtk, igtk_len,
949 KEY_FLAG_GROUP_RX) < 0) {
950 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
951 "driver.");
952 forced_memzero(igtk, sizeof(igtk));
953 return -1;
954 }
955 forced_memzero(igtk, sizeof(igtk));
956
957 return 0;
958 }
959
960
wpa_ft_process_bigtk_subelem(struct wpa_sm * sm,const u8 * bigtk_elem,size_t bigtk_elem_len)961 static int wpa_ft_process_bigtk_subelem(struct wpa_sm *sm, const u8 *bigtk_elem,
962 size_t bigtk_elem_len)
963 {
964 u8 bigtk[WPA_BIGTK_MAX_LEN];
965 size_t bigtk_len;
966 u16 keyidx;
967 const u8 *kek;
968 size_t kek_len;
969
970 if (!sm->beacon_prot || !bigtk_elem ||
971 (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
972 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
973 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
974 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256))
975 return 0;
976
977 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
978 kek = sm->ptk.kek2;
979 kek_len = sm->ptk.kek2_len;
980 } else {
981 kek = sm->ptk.kek;
982 kek_len = sm->ptk.kek_len;
983 }
984
985 wpa_hexdump_key(MSG_DEBUG, "FT: Received BIGTK in Reassoc Resp",
986 bigtk_elem, bigtk_elem_len);
987
988 bigtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
989 if (bigtk_elem_len != 2 + 6 + 1 + bigtk_len + 8) {
990 wpa_printf(MSG_DEBUG,
991 "FT: Invalid BIGTK sub-elem length %lu",
992 (unsigned long) bigtk_elem_len);
993 return -1;
994 }
995 if (bigtk_elem[8] != bigtk_len) {
996 wpa_printf(MSG_DEBUG,
997 "FT: Invalid BIGTK sub-elem Key Length %d",
998 bigtk_elem[8]);
999 return -1;
1000 }
1001
1002 if (aes_unwrap(kek, kek_len, bigtk_len / 8, bigtk_elem + 9, bigtk)) {
1003 wpa_printf(MSG_WARNING,
1004 "FT: AES unwrap failed - could not decrypt BIGTK");
1005 return -1;
1006 }
1007
1008 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
1009
1010 keyidx = WPA_GET_LE16(bigtk_elem);
1011
1012 wpa_hexdump_key(MSG_DEBUG, "FT: BIGTK from Reassoc Resp", bigtk,
1013 bigtk_len);
1014 if (wpa_sm_set_key(sm, -1, wpa_cipher_to_alg(sm->mgmt_group_cipher),
1015 broadcast_ether_addr, keyidx, 0,
1016 bigtk_elem + 2, 6, bigtk, bigtk_len,
1017 KEY_FLAG_GROUP_RX) < 0) {
1018 wpa_printf(MSG_WARNING,
1019 "WPA: Failed to set BIGTK to the driver");
1020 forced_memzero(bigtk, sizeof(bigtk));
1021 return -1;
1022 }
1023 forced_memzero(bigtk, sizeof(bigtk));
1024
1025 return 0;
1026 }
1027
1028
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)1029 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
1030 size_t ies_len, const u8 *src_addr)
1031 {
1032 struct wpa_ft_ies parse;
1033 struct rsn_mdie *mdie;
1034 unsigned int count;
1035 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1036 const u8 *kck;
1037 size_t kck_len;
1038 int own_rsnxe_used;
1039 size_t mic_len;
1040
1041 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
1042
1043 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
1044 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
1045 "enabled for this connection");
1046 return -1;
1047 }
1048
1049 if (sm->ft_reassoc_completed) {
1050 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
1051 return 0;
1052 }
1053
1054 if (wpa_ft_parse_ies(ies, ies_len, &parse, sm->key_mgmt) < 0) {
1055 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
1056 return -1;
1057 }
1058
1059 mdie = (struct rsn_mdie *) parse.mdie;
1060 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1061 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
1062 MOBILITY_DOMAIN_ID_LEN) != 0) {
1063 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1064 return -1;
1065 }
1066
1067 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
1068 sm->pmk_r1_len == SHA512_MAC_LEN)
1069 mic_len = 32;
1070 else if ((sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
1071 sm->pmk_r1_len == SHA384_MAC_LEN) ||
1072 wpa_key_mgmt_sha384(sm->key_mgmt))
1073 mic_len = 24;
1074 else
1075 mic_len = 16;
1076
1077 if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce ||
1078 parse.fte_mic_len != mic_len) {
1079 wpa_printf(MSG_DEBUG,
1080 "FT: Invalid FTE (fte_mic_len=%zu mic_len=%zu)",
1081 parse.fte_mic_len, mic_len);
1082 return -1;
1083 }
1084
1085 if (os_memcmp(parse.fte_snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
1086 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1087 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1088 parse.fte_snonce, WPA_NONCE_LEN);
1089 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1090 sm->snonce, WPA_NONCE_LEN);
1091 return -1;
1092 }
1093
1094 if (os_memcmp(parse.fte_anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
1095 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1096 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1097 parse.fte_anonce, WPA_NONCE_LEN);
1098 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1099 sm->anonce, WPA_NONCE_LEN);
1100 return -1;
1101 }
1102
1103 if (parse.r0kh_id == NULL) {
1104 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1105 return -1;
1106 }
1107
1108 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1109 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1110 {
1111 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1112 "the current R0KH-ID");
1113 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1114 parse.r0kh_id, parse.r0kh_id_len);
1115 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1116 sm->r0kh_id, sm->r0kh_id_len);
1117 return -1;
1118 }
1119
1120 if (parse.r1kh_id == NULL) {
1121 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1122 return -1;
1123 }
1124
1125 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
1126 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1127 "ReassocResp");
1128 return -1;
1129 }
1130
1131 if (parse.rsn_pmkid == NULL ||
1132 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1133 {
1134 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1135 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1136 return -1;
1137 }
1138
1139 count = 3;
1140 if (parse.ric)
1141 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1142 if (parse.rsnxe)
1143 count++;
1144 if (parse.fte_elem_count != count) {
1145 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1146 "Control: received %u expected %u",
1147 parse.fte_elem_count, count);
1148 return -1;
1149 }
1150
1151 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
1152 kck = sm->ptk.kck2;
1153 kck_len = sm->ptk.kck2_len;
1154 } else {
1155 kck = sm->ptk.kck;
1156 kck_len = sm->ptk.kck_len;
1157 }
1158
1159 if (wpa_ft_mic(sm->key_mgmt, kck, kck_len, sm->own_addr, src_addr, 6,
1160 parse.mdie - 2, parse.mdie_len + 2,
1161 parse.ftie - 2, parse.ftie_len + 2,
1162 parse.rsn - 2, parse.rsn_len + 2,
1163 parse.ric, parse.ric_len,
1164 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1165 parse.rsnxe ? parse.rsnxe_len + 2 : 0,
1166 mic) < 0) {
1167 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1168 return -1;
1169 }
1170
1171 if (os_memcmp_const(mic, parse.fte_mic, mic_len) != 0) {
1172 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1173 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1174 parse.fte_mic, mic_len);
1175 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1176 return -1;
1177 }
1178
1179 if (parse.fte_rsnxe_used && !sm->ap_rsnxe) {
1180 wpa_printf(MSG_INFO,
1181 "FT: FTE indicated that AP uses RSNXE, but RSNXE was not included in Beacon/Probe Response frames");
1182 return -1;
1183 }
1184
1185 if (!sm->ap_rsn_ie) {
1186 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1187 "FT: No RSNE for this AP known - trying to get from scan results");
1188 if (wpa_sm_get_beacon_ie(sm) < 0) {
1189 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1190 "FT: Could not find AP from the scan results");
1191 return -1;
1192 }
1193 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
1194 "FT: Found the current AP from updated scan results");
1195 }
1196
1197 if (sm->ap_rsn_ie &&
1198 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
1199 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
1200 parse.rsn - 2, parse.rsn_len + 2)) {
1201 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1202 "FT: RSNE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1203 wpa_hexdump(MSG_INFO, "RSNE in Beacon/ProbeResp",
1204 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
1205 wpa_hexdump(MSG_INFO,
1206 "RSNE in FT protocol Reassociation Response frame",
1207 parse.rsn ? parse.rsn - 2 : NULL,
1208 parse.rsn ? parse.rsn_len + 2 : 0);
1209 return -1;
1210 }
1211
1212 own_rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) &&
1213 (sm->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
1214 sm->sae_pwe == SAE_PWE_BOTH);
1215 if ((sm->ap_rsnxe && !parse.rsnxe && own_rsnxe_used) ||
1216 (!sm->ap_rsnxe && parse.rsnxe) ||
1217 (sm->ap_rsnxe && parse.rsnxe &&
1218 (sm->ap_rsnxe_len != 2 + parse.rsnxe_len ||
1219 os_memcmp(sm->ap_rsnxe, parse.rsnxe - 2,
1220 sm->ap_rsnxe_len) != 0))) {
1221 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1222 "FT: RSNXE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1223 wpa_hexdump(MSG_INFO, "RSNXE in Beacon/ProbeResp",
1224 sm->ap_rsnxe, sm->ap_rsnxe_len);
1225 wpa_hexdump(MSG_INFO,
1226 "RSNXE in FT protocol Reassociation Response frame",
1227 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1228 parse.rsnxe ? parse.rsnxe_len + 2 : 0);
1229 return -1;
1230 }
1231
1232 #ifdef CONFIG_OCV
1233 if (wpa_sm_ocv_enabled(sm)) {
1234 struct wpa_channel_info ci;
1235
1236 if (wpa_sm_channel_info(sm, &ci) != 0) {
1237 wpa_printf(MSG_WARNING,
1238 "Failed to get channel info to validate received OCI in (Re)Assoc Response");
1239 return -1;
1240 }
1241
1242 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
1243 channel_width_to_int(ci.chanwidth),
1244 ci.seg1_idx) != OCI_SUCCESS) {
1245 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
1246 "addr=" MACSTR " frame=ft-assoc error=%s",
1247 MAC2STR(src_addr), ocv_errorstr);
1248 return -1;
1249 }
1250 }
1251 #endif /* CONFIG_OCV */
1252
1253 sm->ft_reassoc_completed = 1;
1254
1255 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0 ||
1256 wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0 ||
1257 wpa_ft_process_bigtk_subelem(sm, parse.bigtk, parse.bigtk_len) < 0)
1258 return -1;
1259
1260 if (sm->set_ptk_after_assoc) {
1261 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
1262 "are associated");
1263 if (wpa_ft_install_ptk(sm, src_addr) < 0)
1264 return -1;
1265 sm->set_ptk_after_assoc = 0;
1266 }
1267
1268 if (parse.ric) {
1269 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
1270 parse.ric, parse.ric_len);
1271 /* TODO: parse response and inform driver about results when
1272 * using wpa_supplicant SME */
1273 }
1274
1275 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
1276
1277 return 0;
1278 }
1279
1280
1281 /**
1282 * wpa_ft_start_over_ds - Generate over-the-DS auth request
1283 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1284 * @target_ap: Target AP Address
1285 * @mdie: Mobility Domain IE from the target AP
1286 * @force: Whether to force the request and ignore mobility domain differences
1287 * (only for testing purposes)
1288 * Returns: 0 on success, -1 on failure
1289 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie,bool force)1290 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1291 const u8 *mdie, bool force)
1292 {
1293 u8 *ft_ies;
1294 size_t ft_ies_len;
1295
1296 if (!force &&
1297 (!mdie || mdie[1] < 3 || !wpa_sm_has_ft_keys(sm, mdie + 2))) {
1298 wpa_printf(MSG_DEBUG, "FT: Cannot use over-the DS with " MACSTR
1299 " - no keys matching the mobility domain",
1300 MAC2STR(target_ap));
1301 return -1;
1302 }
1303
1304 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1305 MAC2STR(target_ap));
1306
1307 /* Generate a new SNonce */
1308 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1309 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1310 return -1;
1311 }
1312
1313 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1314 NULL, 0, target_ap, NULL, 0, mdie, 0);
1315 if (ft_ies) {
1316 sm->over_the_ds_in_progress = 1;
1317 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1318 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1319 os_free(ft_ies);
1320 }
1321
1322 return 0;
1323 }
1324
1325
1326 #ifdef CONFIG_PASN
1327
wpa_ft_pasn_get_r1kh(struct wpa_sm * sm,const u8 * bssid)1328 static struct pasn_ft_r1kh * wpa_ft_pasn_get_r1kh(struct wpa_sm *sm,
1329 const u8 *bssid)
1330 {
1331 size_t i;
1332
1333 for (i = 0; i < sm->n_pasn_r1kh; i++)
1334 if (os_memcmp(sm->pasn_r1kh[i].bssid, bssid, ETH_ALEN) == 0)
1335 return &sm->pasn_r1kh[i];
1336
1337 return NULL;
1338 }
1339
1340
wpa_ft_pasn_store_r1kh(struct wpa_sm * sm,const u8 * bssid)1341 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid)
1342 {
1343 struct pasn_ft_r1kh *tmp = wpa_ft_pasn_get_r1kh(sm, bssid);
1344
1345 if (tmp)
1346 return;
1347
1348 tmp = os_realloc_array(sm->pasn_r1kh, sm->n_pasn_r1kh + 1,
1349 sizeof(*tmp));
1350 if (!tmp) {
1351 wpa_printf(MSG_DEBUG, "PASN: FT: Failed to store R1KH");
1352 return;
1353 }
1354
1355 sm->pasn_r1kh = tmp;
1356 tmp = &sm->pasn_r1kh[sm->n_pasn_r1kh];
1357
1358 wpa_printf(MSG_DEBUG, "PASN: FT: Store R1KH for " MACSTR,
1359 MAC2STR(bssid));
1360
1361 os_memcpy(tmp->bssid, bssid, ETH_ALEN);
1362 os_memcpy(tmp->r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN);
1363
1364 sm->n_pasn_r1kh++;
1365 }
1366
1367
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)1368 int wpa_pasn_ft_derive_pmk_r1(struct wpa_sm *sm, int akmp, const u8 *bssid,
1369 u8 *pmk_r1, size_t *pmk_r1_len, u8 *pmk_r1_name)
1370 {
1371 struct pasn_ft_r1kh *r1kh_entry;
1372
1373 if (sm->key_mgmt != (unsigned int) akmp) {
1374 wpa_printf(MSG_DEBUG,
1375 "PASN: FT: Key management mismatch: %u != %u",
1376 sm->key_mgmt, akmp);
1377 return -1;
1378 }
1379
1380 r1kh_entry = wpa_ft_pasn_get_r1kh(sm, bssid);
1381 if (!r1kh_entry) {
1382 wpa_printf(MSG_DEBUG,
1383 "PASN: FT: Cannot find R1KH-ID for " MACSTR,
1384 MAC2STR(bssid));
1385 return -1;
1386 }
1387
1388 /*
1389 * Note: PMK R0 etc. were already derived and are maintained by the
1390 * state machine, and as the same key hierarchy is used, there is no
1391 * need to derive them again, so only derive PMK R1 etc.
1392 */
1393 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
1394 r1kh_entry->r1kh_id, sm->own_addr, pmk_r1,
1395 pmk_r1_name) < 0)
1396 return -1;
1397
1398 *pmk_r1_len = sm->pmk_r0_len;
1399
1400 wpa_hexdump_key(MSG_DEBUG, "PASN: FT: PMK-R1", pmk_r1, sm->pmk_r0_len);
1401 wpa_hexdump(MSG_DEBUG, "PASN: FT: PMKR1Name", pmk_r1_name,
1402 WPA_PMK_NAME_LEN);
1403
1404 return 0;
1405 }
1406
1407 #endif /* CONFIG_PASN */
1408
1409 #endif /* CONFIG_IEEE80211R */
1410