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, false) < 0)
131 return -1;
132
133 if (ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1) {
134 wpa_ft_parse_ies_free(&ft);
135 return -1;
136 }
137
138 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
139 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
140 os_memcpy(sm->mobility_domain, ft.mdie, MOBILITY_DOMAIN_ID_LEN);
141 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
142 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
143 sm->mdie_ft_capab);
144
145 if (ft.r0kh_id) {
146 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
147 ft.r0kh_id, ft.r0kh_id_len);
148 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
149 sm->r0kh_id_len = ft.r0kh_id_len;
150 } else {
151 /* FIX: When should R0KH-ID be cleared? We need to keep the
152 * old R0KH-ID in order to be able to use this during FT. */
153 /*
154 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
155 * sm->r0kh_id_len = 0;
156 */
157 }
158
159 if (ft.r1kh_id) {
160 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
161 ft.r1kh_id, FT_R1KH_ID_LEN);
162 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
163 } else
164 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
165
166 os_free(sm->assoc_resp_ies);
167 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
168 if (sm->assoc_resp_ies) {
169 u8 *pos = sm->assoc_resp_ies;
170
171 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
172 pos += ft.mdie_len + 2;
173
174 if (ft.ftie) {
175 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
176 pos += ft.ftie_len + 2;
177 }
178 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
179 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
180 "(Re)Association Response",
181 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
182 }
183
184 wpa_ft_parse_ies_free(&ft);
185 return 0;
186 }
187
188
189 /**
190 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
191 * @sm: Pointer to WPA state machine data from wpa_sm_init()
192 * @len: Buffer for returning the length of the IEs
193 * @anonce: ANonce or %NULL if not yet available
194 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
195 * @kck: KCK for MIC or %NULL if no MIC is used
196 * @kck_len: KCK length in octets
197 * @target_ap: Target AP address
198 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
199 * @ric_ies_len: Length of ric_ies buffer in octets
200 * @ap_mdie: Mobility Domain IE from the target AP
201 * @omit_rsnxe: Whether RSNXE is omitted from Reassociation Request frame
202 * Returns: Pointer to buffer with IEs or %NULL on failure
203 *
204 * Caller is responsible for freeing the returned buffer with os_free();
205 */
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)206 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
207 const u8 *anonce, const u8 *pmk_name,
208 const u8 *kck, size_t kck_len,
209 const u8 *target_ap,
210 const u8 *ric_ies, size_t ric_ies_len,
211 const u8 *ap_mdie, int omit_rsnxe)
212 {
213 size_t buf_len;
214 u8 *buf, *pos, *ftie_len, *ftie_pos, *fte_mic, *elem_count;
215 struct rsn_mdie *mdie;
216 struct rsn_ie_hdr *rsnie;
217 int mdie_len;
218 u8 rsnxe[10];
219 size_t rsnxe_len;
220 int rsnxe_used;
221 int res;
222 u8 mic_control;
223
224 sm->ft_completed = 0;
225 sm->ft_reassoc_completed = 0;
226
227 buf_len = 2 + sizeof(struct rsn_mdie) + 2 +
228 sizeof(struct rsn_ftie_sha512) +
229 2 + sm->r0kh_id_len + ric_ies_len + 100;
230 buf = os_zalloc(buf_len);
231 if (buf == NULL)
232 return NULL;
233 pos = buf;
234
235 /* RSNIE[PMKR0Name/PMKR1Name] */
236 rsnie = (struct rsn_ie_hdr *) pos;
237 rsnie->elem_id = WLAN_EID_RSN;
238 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
239 pos = (u8 *) (rsnie + 1);
240
241 /* Group Suite Selector */
242 if (!wpa_cipher_valid_group(sm->group_cipher)) {
243 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
244 sm->group_cipher);
245 os_free(buf);
246 return NULL;
247 }
248 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
249 sm->group_cipher));
250 pos += RSN_SELECTOR_LEN;
251
252 /* Pairwise Suite Count */
253 WPA_PUT_LE16(pos, 1);
254 pos += 2;
255
256 /* Pairwise Suite List */
257 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
258 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
259 sm->pairwise_cipher);
260 os_free(buf);
261 return NULL;
262 }
263 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
264 sm->pairwise_cipher));
265 pos += RSN_SELECTOR_LEN;
266
267 /* Authenticated Key Management Suite Count */
268 WPA_PUT_LE16(pos, 1);
269 pos += 2;
270
271 /* Authenticated Key Management Suite List */
272 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
273 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
274 #ifdef CONFIG_SHA384
275 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
276 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
277 #endif /* CONFIG_SHA384 */
278 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
279 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
280 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
281 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
282 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY)
283 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE_EXT_KEY);
284 #ifdef CONFIG_FILS
285 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
286 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
287 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
288 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
289 #endif /* CONFIG_FILS */
290 else {
291 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
292 sm->key_mgmt);
293 os_free(buf);
294 return NULL;
295 }
296 pos += RSN_SELECTOR_LEN;
297
298 /* RSN Capabilities */
299 WPA_PUT_LE16(pos, rsn_supp_capab(sm));
300 pos += 2;
301
302 /* PMKID Count */
303 WPA_PUT_LE16(pos, 1);
304 pos += 2;
305
306 /* PMKID List [PMKR0Name/PMKR1Name] */
307 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
308 pos += WPA_PMK_NAME_LEN;
309
310 /* Management Group Cipher Suite */
311 switch (sm->mgmt_group_cipher) {
312 case WPA_CIPHER_AES_128_CMAC:
313 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
314 pos += RSN_SELECTOR_LEN;
315 break;
316 case WPA_CIPHER_BIP_GMAC_128:
317 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_128);
318 pos += RSN_SELECTOR_LEN;
319 break;
320 case WPA_CIPHER_BIP_GMAC_256:
321 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_256);
322 pos += RSN_SELECTOR_LEN;
323 break;
324 case WPA_CIPHER_BIP_CMAC_256:
325 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_CMAC_256);
326 pos += RSN_SELECTOR_LEN;
327 break;
328 }
329
330 rsnie->len = (pos - (u8 *) rsnie) - 2;
331
332 /* MDIE */
333 mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
334 if (mdie_len <= 0) {
335 os_free(buf);
336 return NULL;
337 }
338 mdie = (struct rsn_mdie *) (pos + 2);
339 pos += mdie_len;
340
341 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
342 ftie_pos = pos;
343 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
344 ftie_len = pos++;
345 rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) && anonce &&
346 (sm->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
347 sm->sae_pwe == SAE_PWE_BOTH);
348 #ifdef CONFIG_TESTING_OPTIONS
349 if (anonce && sm->ft_rsnxe_used) {
350 rsnxe_used = sm->ft_rsnxe_used == 1;
351 wpa_printf(MSG_DEBUG, "TESTING: FT: Force RSNXE Used %d",
352 rsnxe_used);
353 }
354 #endif /* CONFIG_TESTING_OPTIONS */
355 mic_control = rsnxe_used ? FTE_MIC_CTRL_RSNXE_USED : 0;
356 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
357 sm->pmk_r0_len == SHA512_MAC_LEN) {
358 struct rsn_ftie_sha512 *ftie;
359
360 ftie = (struct rsn_ftie_sha512 *) pos;
361 mic_control |= FTE_MIC_LEN_32 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
362 ftie->mic_control[0] = mic_control;
363 fte_mic = ftie->mic;
364 elem_count = &ftie->mic_control[1];
365 pos += sizeof(*ftie);
366 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
367 if (anonce)
368 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
369 } else if ((sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
370 sm->pmk_r0_len == SHA384_MAC_LEN) ||
371 wpa_key_mgmt_sha384(sm->key_mgmt)) {
372 struct rsn_ftie_sha384 *ftie;
373
374 ftie = (struct rsn_ftie_sha384 *) pos;
375 mic_control |= FTE_MIC_LEN_24 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
376 ftie->mic_control[0] = mic_control;
377 fte_mic = ftie->mic;
378 elem_count = &ftie->mic_control[1];
379 pos += sizeof(*ftie);
380 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
381 if (anonce)
382 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
383 } else {
384 struct rsn_ftie *ftie;
385
386 ftie = (struct rsn_ftie *) pos;
387 mic_control |= FTE_MIC_LEN_16 << FTE_MIC_CTRL_MIC_LEN_SHIFT;
388 ftie->mic_control[0] = mic_control;
389 fte_mic = ftie->mic;
390 elem_count = &ftie->mic_control[1];
391 pos += sizeof(*ftie);
392 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
393 if (anonce)
394 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
395 }
396 if (kck) {
397 /* R1KH-ID sub-element in third FT message */
398 *pos++ = FTIE_SUBELEM_R1KH_ID;
399 *pos++ = FT_R1KH_ID_LEN;
400 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
401 pos += FT_R1KH_ID_LEN;
402 }
403 /* R0KH-ID sub-element */
404 *pos++ = FTIE_SUBELEM_R0KH_ID;
405 *pos++ = sm->r0kh_id_len;
406 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
407 pos += sm->r0kh_id_len;
408 #ifdef CONFIG_OCV
409 if (kck && wpa_sm_ocv_enabled(sm)) {
410 /* OCI sub-element in the third FT message */
411 struct wpa_channel_info ci;
412
413 if (wpa_sm_channel_info(sm, &ci) != 0) {
414 wpa_printf(MSG_WARNING,
415 "Failed to get channel info for OCI element in FTE");
416 os_free(buf);
417 return NULL;
418 }
419 #ifdef CONFIG_TESTING_OPTIONS
420 if (sm->oci_freq_override_ft_assoc) {
421 wpa_printf(MSG_INFO,
422 "TEST: Override OCI KDE frequency %d -> %d MHz",
423 ci.frequency, sm->oci_freq_override_ft_assoc);
424 ci.frequency = sm->oci_freq_override_ft_assoc;
425 }
426 #endif /* CONFIG_TESTING_OPTIONS */
427
428 *pos++ = FTIE_SUBELEM_OCI;
429 *pos++ = OCV_OCI_LEN;
430 if (ocv_insert_oci(&ci, &pos) < 0) {
431 os_free(buf);
432 return NULL;
433 }
434 }
435 #endif /* CONFIG_OCV */
436 *ftie_len = pos - ftie_len - 1;
437
438 if (ric_ies) {
439 /* RIC Request */
440 os_memcpy(pos, ric_ies, ric_ies_len);
441 pos += ric_ies_len;
442 }
443
444 if (omit_rsnxe) {
445 rsnxe_len = 0;
446 } else {
447 res = wpa_gen_rsnxe(sm, rsnxe, sizeof(rsnxe));
448 if (res < 0) {
449 os_free(buf);
450 return NULL;
451 }
452 rsnxe_len = res;
453 }
454
455 if (kck) {
456 /*
457 * IEEE Std 802.11r-2008, 11A.8.4
458 * MIC shall be calculated over:
459 * non-AP STA MAC address
460 * Target AP MAC address
461 * Transaction seq number (5 for ReassocReq, 3 otherwise)
462 * RSN IE
463 * MDIE
464 * FTIE (with MIC field set to 0)
465 * RIC-Request (if present)
466 * RSNXE (if present)
467 */
468 /* Information element count */
469 *elem_count = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len);
470 if (rsnxe_len)
471 *elem_count += 1;
472 if (wpa_ft_mic(sm->key_mgmt, kck, kck_len,
473 sm->own_addr, target_ap, 5,
474 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
475 ftie_pos, 2 + *ftie_len,
476 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
477 ric_ies_len, rsnxe_len ? rsnxe : NULL, rsnxe_len,
478 NULL,
479 fte_mic) < 0) {
480 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
481 os_free(buf);
482 return NULL;
483 }
484 }
485
486 *len = pos - buf;
487
488 return buf;
489 }
490
491
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)492 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
493 {
494 int keylen;
495 enum wpa_alg alg;
496 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
497
498 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
499
500 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
501 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
502 sm->pairwise_cipher);
503 return -1;
504 }
505
506 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
507 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
508
509 /* TODO: AP MLD address for MLO */
510 if (wpa_sm_set_key(sm, -1, alg, bssid, 0, 1, null_rsc, sizeof(null_rsc),
511 (u8 *) sm->ptk.tk, keylen,
512 KEY_FLAG_PAIRWISE_RX_TX) < 0) {
513 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
514 return -1;
515 }
516 sm->tk_set = true;
517
518 wpa_sm_store_ptk(sm, bssid, sm->pairwise_cipher,
519 sm->dot11RSNAConfigPMKLifetime, &sm->ptk);
520 return 0;
521 }
522
523
524 /**
525 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
526 * @sm: Pointer to WPA state machine data from wpa_sm_init()
527 * @mdie: Target AP MDIE
528 * Returns: 0 on success, -1 on failure
529 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)530 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
531 {
532 u8 *ft_ies;
533 size_t ft_ies_len;
534
535 /* Generate a new SNonce */
536 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
537 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
538 return -1;
539 }
540
541 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
542 NULL, 0, sm->bssid, NULL, 0, mdie, 0);
543 if (ft_ies) {
544 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
545 ft_ies, ft_ies_len);
546 os_free(ft_ies);
547 }
548
549 return 0;
550 }
551
552
wpa_ft_add_mdie(struct wpa_sm * sm,u8 * buf,size_t buf_len,const u8 * ap_mdie)553 int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
554 const u8 *ap_mdie)
555 {
556 u8 *pos = buf;
557 struct rsn_mdie *mdie;
558
559 if (buf_len < 2 + sizeof(*mdie)) {
560 wpa_printf(MSG_INFO,
561 "FT: Failed to add MDIE: short buffer, length=%zu",
562 buf_len);
563 return 0;
564 }
565
566 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
567 *pos++ = sizeof(*mdie);
568 mdie = (struct rsn_mdie *) pos;
569 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
570 MOBILITY_DOMAIN_ID_LEN);
571 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
572 sm->mdie_ft_capab;
573
574 return 2 + sizeof(*mdie);
575 }
576
577
wpa_sm_get_ft_md(struct wpa_sm * sm)578 const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
579 {
580 return sm->mobility_domain;
581 }
582
583
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)584 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
585 int ft_action, const u8 *target_ap,
586 const u8 *ric_ies, size_t ric_ies_len)
587 {
588 u8 *ft_ies;
589 size_t ft_ies_len;
590 struct wpa_ft_ies parse;
591 struct rsn_mdie *mdie;
592 u8 ptk_name[WPA_PMK_NAME_LEN];
593 int ret = -1, res;
594 const u8 *bssid;
595 const u8 *kck;
596 size_t kck_len, kdk_len;
597
598 os_memset(&parse, 0, sizeof(parse));
599
600 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
601 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
602
603 if (ft_action) {
604 if (!sm->over_the_ds_in_progress) {
605 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
606 "- drop FT Action Response");
607 goto fail;
608 }
609
610 if (!ether_addr_equal(target_ap, sm->target_ap)) {
611 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
612 "with this Target AP - drop FT Action "
613 "Response");
614 goto fail;
615 }
616 }
617
618 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
619 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
620 "enabled for this connection");
621 goto fail;
622 }
623
624 if (wpa_ft_parse_ies(ies, ies_len, &parse, sm->key_mgmt,
625 !ft_action) < 0) {
626 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
627 goto fail;
628 }
629
630 mdie = (struct rsn_mdie *) parse.mdie;
631 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
632 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
633 MOBILITY_DOMAIN_ID_LEN) != 0) {
634 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
635 goto fail;
636 }
637
638 if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce) {
639 wpa_printf(MSG_DEBUG, "FT: Invalid FTE");
640 goto fail;
641 }
642
643 if (os_memcmp(parse.fte_snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
644 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
645 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
646 parse.fte_snonce, WPA_NONCE_LEN);
647 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
648 sm->snonce, WPA_NONCE_LEN);
649 goto fail;
650 }
651
652 if (parse.r0kh_id == NULL) {
653 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
654 goto fail;
655 }
656
657 if (parse.r0kh_id_len != sm->r0kh_id_len ||
658 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
659 {
660 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
661 "the current R0KH-ID");
662 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
663 parse.r0kh_id, parse.r0kh_id_len);
664 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
665 sm->r0kh_id, sm->r0kh_id_len);
666 goto fail;
667 }
668
669 if (parse.r1kh_id == NULL) {
670 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
671 goto fail;
672 }
673
674 if (parse.rsn_pmkid == NULL ||
675 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
676 {
677 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
678 "RSNIE");
679 goto fail;
680 }
681
682 if (sm->mfp == 2 && !(parse.rsn_capab & WPA_CAPABILITY_MFPC)) {
683 wpa_printf(MSG_INFO,
684 "FT: Target AP does not support PMF, but local configuration requires that");
685 goto fail;
686 }
687
688 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
689 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
690 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
691 wpa_hexdump(MSG_DEBUG, "FT: ANonce", parse.fte_anonce, WPA_NONCE_LEN);
692 os_memcpy(sm->anonce, parse.fte_anonce, WPA_NONCE_LEN);
693 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
694 sm->r1kh_id, sm->own_addr, sm->pmk_r1,
695 sm->pmk_r1_name) < 0)
696 goto fail;
697 sm->pmk_r1_len = sm->pmk_r0_len;
698
699 bssid = target_ap;
700
701 wpa_ft_pasn_store_r1kh(sm, bssid);
702
703 if (sm->force_kdk_derivation ||
704 (sm->secure_ltf &&
705 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF)))
706 kdk_len = WPA_KDK_MAX_LEN;
707 else
708 kdk_len = 0;
709
710 /* TODO: AP MLD address for MLO */
711 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
712 parse.fte_anonce, sm->own_addr, bssid,
713 sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
714 sm->pairwise_cipher,
715 kdk_len) < 0)
716 goto fail;
717
718 os_memcpy(sm->key_mobility_domain, sm->mobility_domain,
719 MOBILITY_DOMAIN_ID_LEN);
720
721 os_memcpy(sm->key_mobility_domain, sm->mobility_domain,
722 MOBILITY_DOMAIN_ID_LEN);
723
724 #ifdef CONFIG_PASN
725 if (sm->secure_ltf &&
726 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF) &&
727 wpa_ltf_keyseed(&sm->ptk, sm->key_mgmt, sm->pairwise_cipher)) {
728 wpa_printf(MSG_DEBUG, "FT: Failed to derive LTF keyseed");
729 goto fail;
730 }
731 #endif /* CONFIG_PASN */
732
733 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
734 kck = sm->ptk.kck2;
735 kck_len = sm->ptk.kck2_len;
736 } else {
737 kck = sm->ptk.kck;
738 kck_len = sm->ptk.kck_len;
739 }
740 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, parse.fte_anonce,
741 sm->pmk_r1_name,
742 kck, kck_len, bssid,
743 ric_ies, ric_ies_len,
744 parse.mdie ? parse.mdie - 2 : NULL,
745 !sm->ap_rsnxe);
746 if (ft_ies) {
747 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
748 ft_ies, ft_ies_len);
749 os_free(ft_ies);
750 }
751
752 wpa_sm_mark_authenticated(sm, bssid);
753 res = wpa_ft_install_ptk(sm, bssid);
754 if (res) {
755 /*
756 * Some drivers do not support key configuration when we are
757 * not associated with the target AP. Work around this by
758 * trying again after the following reassociation gets
759 * completed.
760 */
761 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
762 "association - try again after reassociation");
763 sm->set_ptk_after_assoc = 1;
764 } else
765 sm->set_ptk_after_assoc = 0;
766
767 sm->ft_completed = 1;
768 if (ft_action) {
769 /*
770 * The caller is expected trigger re-association with the
771 * Target AP.
772 */
773 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
774 }
775
776 ret = 0;
777 fail:
778 wpa_ft_parse_ies_free(&parse);
779 return ret;
780 }
781
782
wpa_ft_is_completed(struct wpa_sm * sm)783 int wpa_ft_is_completed(struct wpa_sm *sm)
784 {
785 if (sm == NULL)
786 return 0;
787
788 if (!wpa_key_mgmt_ft(sm->key_mgmt))
789 return 0;
790
791 return sm->ft_completed;
792 }
793
794
wpa_reset_ft_completed(struct wpa_sm * sm)795 void wpa_reset_ft_completed(struct wpa_sm *sm)
796 {
797 if (sm != NULL)
798 sm->ft_completed = 0;
799 }
800
801
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)802 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
803 size_t gtk_elem_len)
804 {
805 u8 gtk[32];
806 int keyidx;
807 enum wpa_alg alg;
808 size_t gtk_len, keylen, rsc_len;
809 const u8 *kek;
810 size_t kek_len;
811
812 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
813 kek = sm->ptk.kek2;
814 kek_len = sm->ptk.kek2_len;
815 } else {
816 kek = sm->ptk.kek;
817 kek_len = sm->ptk.kek_len;
818 }
819
820 if (gtk_elem == NULL) {
821 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
822 return 0;
823 }
824
825 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
826 gtk_elem, gtk_elem_len);
827
828 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
829 gtk_elem_len - 19 > sizeof(gtk)) {
830 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
831 "length %lu", (unsigned long) gtk_elem_len);
832 return -1;
833 }
834 gtk_len = gtk_elem_len - 19;
835 if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
836 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
837 "decrypt GTK");
838 return -1;
839 }
840
841 keylen = wpa_cipher_key_len(sm->group_cipher);
842 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
843 alg = wpa_cipher_to_alg(sm->group_cipher);
844 if (alg == WPA_ALG_NONE) {
845 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
846 sm->group_cipher);
847 return -1;
848 }
849
850 if (gtk_len < keylen) {
851 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
852 return -1;
853 }
854
855 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
856
857 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
858
859 if (gtk_elem[2] != keylen) {
860 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
861 "negotiated %lu",
862 gtk_elem[2], (unsigned long) keylen);
863 return -1;
864 }
865
866 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
867 if (sm->group_cipher == WPA_CIPHER_TKIP) {
868 /* Swap Tx/Rx keys for Michael MIC */
869 u8 tmp[8];
870 os_memcpy(tmp, gtk + 16, 8);
871 os_memcpy(gtk + 16, gtk + 24, 8);
872 os_memcpy(gtk + 24, tmp, 8);
873 }
874 if (wpa_sm_set_key(sm, -1, alg, broadcast_ether_addr, keyidx, 0,
875 gtk_elem + 3, rsc_len, gtk, keylen,
876 KEY_FLAG_GROUP_RX) < 0) {
877 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
878 "driver.");
879 return -1;
880 }
881
882 return 0;
883 }
884
885
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)886 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
887 size_t igtk_elem_len)
888 {
889 u8 igtk[WPA_IGTK_MAX_LEN];
890 size_t igtk_len;
891 u16 keyidx;
892 const u8 *kek;
893 size_t kek_len;
894
895 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
896 kek = sm->ptk.kek2;
897 kek_len = sm->ptk.kek2_len;
898 } else {
899 kek = sm->ptk.kek;
900 kek_len = sm->ptk.kek_len;
901 }
902
903 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
904 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
905 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
906 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
907 return 0;
908
909 if (igtk_elem == NULL) {
910 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
911 return 0;
912 }
913
914 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
915 igtk_elem, igtk_elem_len);
916
917 igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
918 if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
919 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
920 "length %lu", (unsigned long) igtk_elem_len);
921 return -1;
922 }
923 if (igtk_elem[8] != igtk_len) {
924 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
925 "%d", igtk_elem[8]);
926 return -1;
927 }
928
929 if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
930 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
931 "decrypt IGTK");
932 return -1;
933 }
934
935 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
936
937 keyidx = WPA_GET_LE16(igtk_elem);
938
939 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
940 igtk_len);
941 if (wpa_sm_set_key(sm, -1, wpa_cipher_to_alg(sm->mgmt_group_cipher),
942 broadcast_ether_addr, keyidx, 0,
943 igtk_elem + 2, 6, igtk, igtk_len,
944 KEY_FLAG_GROUP_RX) < 0) {
945 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
946 "driver.");
947 forced_memzero(igtk, sizeof(igtk));
948 return -1;
949 }
950 forced_memzero(igtk, sizeof(igtk));
951
952 return 0;
953 }
954
955
wpa_ft_process_bigtk_subelem(struct wpa_sm * sm,const u8 * bigtk_elem,size_t bigtk_elem_len)956 static int wpa_ft_process_bigtk_subelem(struct wpa_sm *sm, const u8 *bigtk_elem,
957 size_t bigtk_elem_len)
958 {
959 u8 bigtk[WPA_BIGTK_MAX_LEN];
960 size_t bigtk_len;
961 u16 keyidx;
962 const u8 *kek;
963 size_t kek_len;
964
965 if (!sm->beacon_prot || !bigtk_elem ||
966 (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
967 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
968 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
969 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256))
970 return 0;
971
972 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
973 kek = sm->ptk.kek2;
974 kek_len = sm->ptk.kek2_len;
975 } else {
976 kek = sm->ptk.kek;
977 kek_len = sm->ptk.kek_len;
978 }
979
980 wpa_hexdump_key(MSG_DEBUG, "FT: Received BIGTK in Reassoc Resp",
981 bigtk_elem, bigtk_elem_len);
982
983 bigtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
984 if (bigtk_elem_len != 2 + 6 + 1 + bigtk_len + 8) {
985 wpa_printf(MSG_DEBUG,
986 "FT: Invalid BIGTK sub-elem length %lu",
987 (unsigned long) bigtk_elem_len);
988 return -1;
989 }
990 if (bigtk_elem[8] != bigtk_len) {
991 wpa_printf(MSG_DEBUG,
992 "FT: Invalid BIGTK sub-elem Key Length %d",
993 bigtk_elem[8]);
994 return -1;
995 }
996
997 if (aes_unwrap(kek, kek_len, bigtk_len / 8, bigtk_elem + 9, bigtk)) {
998 wpa_printf(MSG_WARNING,
999 "FT: AES unwrap failed - could not decrypt BIGTK");
1000 return -1;
1001 }
1002
1003 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
1004
1005 keyidx = WPA_GET_LE16(bigtk_elem);
1006
1007 wpa_hexdump_key(MSG_DEBUG, "FT: BIGTK from Reassoc Resp", bigtk,
1008 bigtk_len);
1009 if (wpa_sm_set_key(sm, -1, wpa_cipher_to_alg(sm->mgmt_group_cipher),
1010 broadcast_ether_addr, keyidx, 0,
1011 bigtk_elem + 2, 6, bigtk, bigtk_len,
1012 KEY_FLAG_GROUP_RX) < 0) {
1013 wpa_printf(MSG_WARNING,
1014 "WPA: Failed to set BIGTK to the driver");
1015 forced_memzero(bigtk, sizeof(bigtk));
1016 return -1;
1017 }
1018 forced_memzero(bigtk, sizeof(bigtk));
1019
1020 return 0;
1021 }
1022
1023
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)1024 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
1025 size_t ies_len, const u8 *src_addr)
1026 {
1027 struct wpa_ft_ies parse;
1028 struct rsn_mdie *mdie;
1029 unsigned int count;
1030 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1031 const u8 *kck;
1032 size_t kck_len;
1033 int own_rsnxe_used;
1034 size_t mic_len;
1035 int ret = -1;
1036
1037 os_memset(&parse, 0, sizeof(parse));
1038
1039 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
1040
1041 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
1042 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
1043 "enabled for this connection");
1044 goto fail;
1045 }
1046
1047 if (sm->ft_reassoc_completed) {
1048 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
1049 return 0;
1050 }
1051
1052 if (wpa_ft_parse_ies(ies, ies_len, &parse, sm->key_mgmt, true) < 0) {
1053 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
1054 goto fail;
1055 }
1056
1057 mdie = (struct rsn_mdie *) parse.mdie;
1058 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1059 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
1060 MOBILITY_DOMAIN_ID_LEN) != 0) {
1061 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1062 goto fail;
1063 }
1064
1065 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
1066 sm->pmk_r1_len == SHA512_MAC_LEN)
1067 mic_len = 32;
1068 else if ((sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
1069 sm->pmk_r1_len == SHA384_MAC_LEN) ||
1070 wpa_key_mgmt_sha384(sm->key_mgmt))
1071 mic_len = 24;
1072 else
1073 mic_len = 16;
1074
1075 if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce ||
1076 parse.fte_mic_len != mic_len) {
1077 wpa_printf(MSG_DEBUG,
1078 "FT: Invalid FTE (fte_mic_len=%zu mic_len=%zu)",
1079 parse.fte_mic_len, mic_len);
1080 goto fail;
1081 }
1082
1083 if (os_memcmp(parse.fte_snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
1084 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1085 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1086 parse.fte_snonce, WPA_NONCE_LEN);
1087 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1088 sm->snonce, WPA_NONCE_LEN);
1089 goto fail;
1090 }
1091
1092 if (os_memcmp(parse.fte_anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
1093 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1094 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1095 parse.fte_anonce, WPA_NONCE_LEN);
1096 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1097 sm->anonce, WPA_NONCE_LEN);
1098 goto fail;
1099 }
1100
1101 if (parse.r0kh_id == NULL) {
1102 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1103 goto fail;
1104 }
1105
1106 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1107 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1108 {
1109 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1110 "the current R0KH-ID");
1111 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1112 parse.r0kh_id, parse.r0kh_id_len);
1113 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1114 sm->r0kh_id, sm->r0kh_id_len);
1115 goto fail;
1116 }
1117
1118 if (parse.r1kh_id == NULL) {
1119 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1120 goto fail;
1121 }
1122
1123 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
1124 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1125 "ReassocResp");
1126 goto fail;
1127 }
1128
1129 if (parse.rsn_pmkid == NULL ||
1130 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1131 {
1132 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1133 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1134 goto fail;
1135 }
1136
1137 count = 3;
1138 if (parse.ric)
1139 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1140 if (parse.rsnxe)
1141 count++;
1142 if (parse.fte_elem_count != count) {
1143 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1144 "Control: received %u expected %u",
1145 parse.fte_elem_count, count);
1146 goto fail;
1147 }
1148
1149 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
1150 kck = sm->ptk.kck2;
1151 kck_len = sm->ptk.kck2_len;
1152 } else {
1153 kck = sm->ptk.kck;
1154 kck_len = sm->ptk.kck_len;
1155 }
1156
1157 if (wpa_ft_mic(sm->key_mgmt, kck, kck_len, sm->own_addr, src_addr, 6,
1158 parse.mdie - 2, parse.mdie_len + 2,
1159 parse.ftie - 2, parse.ftie_len + 2,
1160 parse.rsn - 2, parse.rsn_len + 2,
1161 parse.ric, parse.ric_len,
1162 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1163 parse.rsnxe ? parse.rsnxe_len + 2 : 0,
1164 NULL,
1165 mic) < 0) {
1166 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1167 goto fail;
1168 }
1169
1170 if (os_memcmp_const(mic, parse.fte_mic, mic_len) != 0) {
1171 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1172 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1173 parse.fte_mic, mic_len);
1174 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1175 goto fail;
1176 }
1177
1178 if (parse.fte_rsnxe_used && !sm->ap_rsnxe) {
1179 wpa_printf(MSG_INFO,
1180 "FT: FTE indicated that AP uses RSNXE, but RSNXE was not included in Beacon/Probe Response frames");
1181 goto fail;
1182 }
1183
1184 if (!sm->ap_rsn_ie) {
1185 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1186 "FT: No RSNE for this AP known - trying to get from scan results");
1187 if (wpa_sm_get_beacon_ie(sm) < 0) {
1188 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1189 "FT: Could not find AP from the scan results");
1190 goto fail;
1191 }
1192 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
1193 "FT: Found the current AP from updated scan results");
1194 }
1195
1196 if (sm->ap_rsn_ie &&
1197 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
1198 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
1199 parse.rsn - 2, parse.rsn_len + 2)) {
1200 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1201 "FT: RSNE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1202 wpa_hexdump(MSG_INFO, "RSNE in Beacon/ProbeResp",
1203 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
1204 wpa_hexdump(MSG_INFO,
1205 "RSNE in FT protocol Reassociation Response frame",
1206 parse.rsn ? parse.rsn - 2 : NULL,
1207 parse.rsn ? parse.rsn_len + 2 : 0);
1208 goto fail;
1209 }
1210
1211 own_rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) &&
1212 (sm->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
1213 sm->sae_pwe == SAE_PWE_BOTH);
1214 if ((sm->ap_rsnxe && !parse.rsnxe && own_rsnxe_used) ||
1215 (!sm->ap_rsnxe && parse.rsnxe) ||
1216 (sm->ap_rsnxe && parse.rsnxe &&
1217 (sm->ap_rsnxe_len != 2 + parse.rsnxe_len ||
1218 os_memcmp(sm->ap_rsnxe, parse.rsnxe - 2,
1219 sm->ap_rsnxe_len) != 0))) {
1220 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1221 "FT: RSNXE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1222 wpa_hexdump(MSG_INFO, "RSNXE in Beacon/ProbeResp",
1223 sm->ap_rsnxe, sm->ap_rsnxe_len);
1224 wpa_hexdump(MSG_INFO,
1225 "RSNXE in FT protocol Reassociation Response frame",
1226 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1227 parse.rsnxe ? parse.rsnxe_len + 2 : 0);
1228 goto fail;
1229 }
1230
1231 #ifdef CONFIG_OCV
1232 if (wpa_sm_ocv_enabled(sm)) {
1233 struct wpa_channel_info ci;
1234
1235 if (wpa_sm_channel_info(sm, &ci) != 0) {
1236 wpa_printf(MSG_WARNING,
1237 "Failed to get channel info to validate received OCI in (Re)Assoc Response");
1238 goto fail;
1239 }
1240
1241 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
1242 channel_width_to_int(ci.chanwidth),
1243 ci.seg1_idx) != OCI_SUCCESS) {
1244 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
1245 "addr=" MACSTR " frame=ft-assoc error=%s",
1246 MAC2STR(src_addr), ocv_errorstr);
1247 goto fail;
1248 }
1249 }
1250 #endif /* CONFIG_OCV */
1251
1252 sm->ft_reassoc_completed = 1;
1253
1254 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0 ||
1255 wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0 ||
1256 wpa_ft_process_bigtk_subelem(sm, parse.bigtk, parse.bigtk_len) < 0)
1257 goto fail;
1258
1259 if (sm->set_ptk_after_assoc) {
1260 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
1261 "are associated");
1262 if (wpa_ft_install_ptk(sm, src_addr) < 0)
1263 goto fail;
1264 sm->set_ptk_after_assoc = 0;
1265 }
1266
1267 if (parse.ric) {
1268 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
1269 parse.ric, parse.ric_len);
1270 /* TODO: parse response and inform driver about results when
1271 * using wpa_supplicant SME */
1272 }
1273
1274 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
1275
1276 ret = 0;
1277 fail:
1278 wpa_ft_parse_ies_free(&parse);
1279 return ret;
1280 }
1281
1282
1283 /**
1284 * wpa_ft_start_over_ds - Generate over-the-DS auth request
1285 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1286 * @target_ap: Target AP Address
1287 * @mdie: Mobility Domain IE from the target AP
1288 * @force: Whether to force the request and ignore mobility domain differences
1289 * (only for testing purposes)
1290 * Returns: 0 on success, -1 on failure
1291 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie,bool force)1292 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1293 const u8 *mdie, bool force)
1294 {
1295 u8 *ft_ies;
1296 size_t ft_ies_len;
1297
1298 if (!force &&
1299 (!mdie || mdie[1] < 3 || !wpa_sm_has_ft_keys(sm, mdie + 2))) {
1300 wpa_printf(MSG_DEBUG, "FT: Cannot use over-the DS with " MACSTR
1301 " - no keys matching the mobility domain",
1302 MAC2STR(target_ap));
1303 return -1;
1304 }
1305
1306 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1307 MAC2STR(target_ap));
1308
1309 /* Generate a new SNonce */
1310 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1311 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1312 return -1;
1313 }
1314
1315 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1316 NULL, 0, target_ap, NULL, 0, mdie, 0);
1317 if (ft_ies) {
1318 sm->over_the_ds_in_progress = 1;
1319 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1320 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1321 os_free(ft_ies);
1322 }
1323
1324 return 0;
1325 }
1326
1327
1328 #ifdef CONFIG_PASN
1329
wpa_ft_pasn_get_r1kh(struct wpa_sm * sm,const u8 * bssid)1330 static struct pasn_ft_r1kh * wpa_ft_pasn_get_r1kh(struct wpa_sm *sm,
1331 const u8 *bssid)
1332 {
1333 size_t i;
1334
1335 for (i = 0; i < sm->n_pasn_r1kh; i++)
1336 if (ether_addr_equal(sm->pasn_r1kh[i].bssid, bssid))
1337 return &sm->pasn_r1kh[i];
1338
1339 return NULL;
1340 }
1341
1342
wpa_ft_pasn_store_r1kh(struct wpa_sm * sm,const u8 * bssid)1343 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid)
1344 {
1345 struct pasn_ft_r1kh *tmp = wpa_ft_pasn_get_r1kh(sm, bssid);
1346
1347 if (tmp)
1348 return;
1349
1350 tmp = os_realloc_array(sm->pasn_r1kh, sm->n_pasn_r1kh + 1,
1351 sizeof(*tmp));
1352 if (!tmp) {
1353 wpa_printf(MSG_DEBUG, "PASN: FT: Failed to store R1KH");
1354 return;
1355 }
1356
1357 sm->pasn_r1kh = tmp;
1358 tmp = &sm->pasn_r1kh[sm->n_pasn_r1kh];
1359
1360 wpa_printf(MSG_DEBUG, "PASN: FT: Store R1KH for " MACSTR,
1361 MAC2STR(bssid));
1362
1363 os_memcpy(tmp->bssid, bssid, ETH_ALEN);
1364 os_memcpy(tmp->r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN);
1365
1366 sm->n_pasn_r1kh++;
1367 }
1368
1369
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)1370 int wpa_pasn_ft_derive_pmk_r1(struct wpa_sm *sm, int akmp, const u8 *bssid,
1371 u8 *pmk_r1, size_t *pmk_r1_len, u8 *pmk_r1_name)
1372 {
1373 struct pasn_ft_r1kh *r1kh_entry;
1374
1375 if (sm->key_mgmt != (unsigned int) akmp) {
1376 wpa_printf(MSG_DEBUG,
1377 "PASN: FT: Key management mismatch: %u != %u",
1378 sm->key_mgmt, akmp);
1379 return -1;
1380 }
1381
1382 r1kh_entry = wpa_ft_pasn_get_r1kh(sm, bssid);
1383 if (!r1kh_entry) {
1384 wpa_printf(MSG_DEBUG,
1385 "PASN: FT: Cannot find R1KH-ID for " MACSTR,
1386 MAC2STR(bssid));
1387 return -1;
1388 }
1389
1390 /*
1391 * Note: PMK R0 etc. were already derived and are maintained by the
1392 * state machine, and as the same key hierarchy is used, there is no
1393 * need to derive them again, so only derive PMK R1 etc.
1394 */
1395 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
1396 r1kh_entry->r1kh_id, sm->own_addr, pmk_r1,
1397 pmk_r1_name) < 0)
1398 return -1;
1399
1400 *pmk_r1_len = sm->pmk_r0_len;
1401
1402 wpa_hexdump_key(MSG_DEBUG, "PASN: FT: PMK-R1", pmk_r1, sm->pmk_r0_len);
1403 wpa_hexdump(MSG_DEBUG, "PASN: FT: PMKR1Name", pmk_r1_name,
1404 WPA_PMK_NAME_LEN);
1405
1406 return 0;
1407 }
1408
1409 #endif /* CONFIG_PASN */
1410
1411 #endif /* CONFIG_IEEE80211R */
1412
