1 /*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2018, Jouni Malinen <[email protected]>
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 #ifdef CONFIG_PASN
722 if (sm->secure_ltf &&
723 ieee802_11_rsnx_capab(sm->ap_rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF) &&
724 wpa_ltf_keyseed(&sm->ptk, sm->key_mgmt, sm->pairwise_cipher)) {
725 wpa_printf(MSG_DEBUG, "FT: Failed to derive LTF keyseed");
726 goto fail;
727 }
728 #endif /* CONFIG_PASN */
729
730 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
731 kck = sm->ptk.kck2;
732 kck_len = sm->ptk.kck2_len;
733 } else {
734 kck = sm->ptk.kck;
735 kck_len = sm->ptk.kck_len;
736 }
737 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, parse.fte_anonce,
738 sm->pmk_r1_name,
739 kck, kck_len, bssid,
740 ric_ies, ric_ies_len,
741 parse.mdie ? parse.mdie - 2 : NULL,
742 !sm->ap_rsnxe);
743 if (ft_ies) {
744 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
745 ft_ies, ft_ies_len);
746 os_free(ft_ies);
747 }
748
749 wpa_sm_mark_authenticated(sm, bssid);
750 res = wpa_ft_install_ptk(sm, bssid);
751 if (res) {
752 /*
753 * Some drivers do not support key configuration when we are
754 * not associated with the target AP. Work around this by
755 * trying again after the following reassociation gets
756 * completed.
757 */
758 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
759 "association - try again after reassociation");
760 sm->set_ptk_after_assoc = 1;
761 } else
762 sm->set_ptk_after_assoc = 0;
763
764 sm->ft_completed = 1;
765 if (ft_action) {
766 /*
767 * The caller is expected trigger re-association with the
768 * Target AP.
769 */
770 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
771 }
772
773 ret = 0;
774 fail:
775 wpa_ft_parse_ies_free(&parse);
776 return ret;
777 }
778
779
wpa_ft_is_completed(struct wpa_sm * sm)780 int wpa_ft_is_completed(struct wpa_sm *sm)
781 {
782 if (sm == NULL)
783 return 0;
784
785 if (!wpa_key_mgmt_ft(sm->key_mgmt))
786 return 0;
787
788 return sm->ft_completed;
789 }
790
791 #if defined(CONFIG_DRIVER_NL80211_BRCM) || defined(CONFIG_DRIVER_NL80211_SYNA)
wpa_ft_is_ft_protocol(struct wpa_sm * sm)792 int wpa_ft_is_ft_protocol(struct wpa_sm *sm)
793 {
794 if (sm == NULL)
795 return 0;
796
797 if (!wpa_key_mgmt_ft(sm->key_mgmt))
798 return 0;
799
800 return sm->ft_protocol;
801 }
802 #endif /* CONFIG_DRIVER_NL80211_BRCM || CONFIG_DRIVER_NL80211_SYNA */
803
wpa_reset_ft_completed(struct wpa_sm * sm)804 void wpa_reset_ft_completed(struct wpa_sm *sm)
805 {
806 if (sm != NULL)
807 sm->ft_completed = 0;
808 }
809
810
wpa_set_ft_completed(struct wpa_sm * sm)811 void wpa_set_ft_completed(struct wpa_sm *sm)
812 {
813 if (sm != NULL)
814 sm->ft_completed = 1;
815 }
816
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)817 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
818 size_t gtk_elem_len)
819 {
820 u8 gtk[32];
821 int keyidx;
822 enum wpa_alg alg;
823 size_t gtk_len, keylen, rsc_len;
824 const u8 *kek;
825 size_t kek_len;
826
827 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
828 kek = sm->ptk.kek2;
829 kek_len = sm->ptk.kek2_len;
830 } else {
831 kek = sm->ptk.kek;
832 kek_len = sm->ptk.kek_len;
833 }
834
835 if (gtk_elem == NULL) {
836 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
837 return 0;
838 }
839
840 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
841 gtk_elem, gtk_elem_len);
842
843 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
844 gtk_elem_len - 19 > sizeof(gtk)) {
845 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
846 "length %lu", (unsigned long) gtk_elem_len);
847 return -1;
848 }
849 gtk_len = gtk_elem_len - 19;
850 if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
851 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
852 "decrypt GTK");
853 return -1;
854 }
855
856 keylen = wpa_cipher_key_len(sm->group_cipher);
857 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
858 alg = wpa_cipher_to_alg(sm->group_cipher);
859 if (alg == WPA_ALG_NONE) {
860 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
861 sm->group_cipher);
862 return -1;
863 }
864
865 if (gtk_len < keylen) {
866 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
867 return -1;
868 }
869
870 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
871
872 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
873
874 if (gtk_elem[2] != keylen) {
875 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
876 "negotiated %lu",
877 gtk_elem[2], (unsigned long) keylen);
878 return -1;
879 }
880
881 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
882 if (sm->group_cipher == WPA_CIPHER_TKIP) {
883 /* Swap Tx/Rx keys for Michael MIC */
884 u8 tmp[8];
885 os_memcpy(tmp, gtk + 16, 8);
886 os_memcpy(gtk + 16, gtk + 24, 8);
887 os_memcpy(gtk + 24, tmp, 8);
888 }
889 if (wpa_sm_set_key(sm, -1, alg, broadcast_ether_addr, keyidx, 0,
890 gtk_elem + 3, rsc_len, gtk, keylen,
891 KEY_FLAG_GROUP_RX) < 0) {
892 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
893 "driver.");
894 return -1;
895 }
896
897 return 0;
898 }
899
900
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)901 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
902 size_t igtk_elem_len)
903 {
904 u8 igtk[WPA_IGTK_MAX_LEN];
905 size_t igtk_len;
906 u16 keyidx;
907 const u8 *kek;
908 size_t kek_len;
909
910 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
911 kek = sm->ptk.kek2;
912 kek_len = sm->ptk.kek2_len;
913 } else {
914 kek = sm->ptk.kek;
915 kek_len = sm->ptk.kek_len;
916 }
917
918 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
919 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
920 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
921 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
922 return 0;
923
924 if (igtk_elem == NULL) {
925 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
926 return 0;
927 }
928
929 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
930 igtk_elem, igtk_elem_len);
931
932 igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
933 if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
934 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
935 "length %lu", (unsigned long) igtk_elem_len);
936 return -1;
937 }
938 if (igtk_elem[8] != igtk_len) {
939 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
940 "%d", igtk_elem[8]);
941 return -1;
942 }
943
944 if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
945 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
946 "decrypt IGTK");
947 return -1;
948 }
949
950 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
951
952 keyidx = WPA_GET_LE16(igtk_elem);
953
954 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
955 igtk_len);
956 if (wpa_sm_set_key(sm, -1, wpa_cipher_to_alg(sm->mgmt_group_cipher),
957 broadcast_ether_addr, keyidx, 0,
958 igtk_elem + 2, 6, igtk, igtk_len,
959 KEY_FLAG_GROUP_RX) < 0) {
960 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
961 "driver.");
962 forced_memzero(igtk, sizeof(igtk));
963 return -1;
964 }
965 forced_memzero(igtk, sizeof(igtk));
966
967 return 0;
968 }
969
970
wpa_ft_process_bigtk_subelem(struct wpa_sm * sm,const u8 * bigtk_elem,size_t bigtk_elem_len)971 static int wpa_ft_process_bigtk_subelem(struct wpa_sm *sm, const u8 *bigtk_elem,
972 size_t bigtk_elem_len)
973 {
974 u8 bigtk[WPA_BIGTK_MAX_LEN];
975 size_t bigtk_len;
976 u16 keyidx;
977 const u8 *kek;
978 size_t kek_len;
979
980 if (!sm->beacon_prot || !bigtk_elem ||
981 (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
982 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
983 sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
984 sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256))
985 return 0;
986
987 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
988 kek = sm->ptk.kek2;
989 kek_len = sm->ptk.kek2_len;
990 } else {
991 kek = sm->ptk.kek;
992 kek_len = sm->ptk.kek_len;
993 }
994
995 wpa_hexdump_key(MSG_DEBUG, "FT: Received BIGTK in Reassoc Resp",
996 bigtk_elem, bigtk_elem_len);
997
998 bigtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
999 if (bigtk_elem_len != 2 + 6 + 1 + bigtk_len + 8) {
1000 wpa_printf(MSG_DEBUG,
1001 "FT: Invalid BIGTK sub-elem length %lu",
1002 (unsigned long) bigtk_elem_len);
1003 return -1;
1004 }
1005 if (bigtk_elem[8] != bigtk_len) {
1006 wpa_printf(MSG_DEBUG,
1007 "FT: Invalid BIGTK sub-elem Key Length %d",
1008 bigtk_elem[8]);
1009 return -1;
1010 }
1011
1012 if (aes_unwrap(kek, kek_len, bigtk_len / 8, bigtk_elem + 9, bigtk)) {
1013 wpa_printf(MSG_WARNING,
1014 "FT: AES unwrap failed - could not decrypt BIGTK");
1015 return -1;
1016 }
1017
1018 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
1019
1020 keyidx = WPA_GET_LE16(bigtk_elem);
1021
1022 wpa_hexdump_key(MSG_DEBUG, "FT: BIGTK from Reassoc Resp", bigtk,
1023 bigtk_len);
1024 if (wpa_sm_set_key(sm, -1, wpa_cipher_to_alg(sm->mgmt_group_cipher),
1025 broadcast_ether_addr, keyidx, 0,
1026 bigtk_elem + 2, 6, bigtk, bigtk_len,
1027 KEY_FLAG_GROUP_RX) < 0) {
1028 wpa_printf(MSG_WARNING,
1029 "WPA: Failed to set BIGTK to the driver");
1030 forced_memzero(bigtk, sizeof(bigtk));
1031 return -1;
1032 }
1033 forced_memzero(bigtk, sizeof(bigtk));
1034
1035 return 0;
1036 }
1037
1038
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)1039 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
1040 size_t ies_len, const u8 *src_addr)
1041 {
1042 struct wpa_ft_ies parse;
1043 struct rsn_mdie *mdie;
1044 unsigned int count;
1045 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1046 const u8 *kck;
1047 size_t kck_len;
1048 int own_rsnxe_used;
1049 size_t mic_len;
1050 int ret = -1;
1051
1052 os_memset(&parse, 0, sizeof(parse));
1053
1054 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
1055
1056 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
1057 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
1058 "enabled for this connection");
1059 goto fail;
1060 }
1061
1062 if (sm->ft_reassoc_completed) {
1063 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
1064 return 0;
1065 }
1066
1067 if (wpa_ft_parse_ies(ies, ies_len, &parse, sm->key_mgmt, true) < 0) {
1068 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
1069 goto fail;
1070 }
1071
1072 mdie = (struct rsn_mdie *) parse.mdie;
1073 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1074 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
1075 MOBILITY_DOMAIN_ID_LEN) != 0) {
1076 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1077 goto fail;
1078 }
1079
1080 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
1081 sm->pmk_r1_len == SHA512_MAC_LEN)
1082 mic_len = 32;
1083 else if ((sm->key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
1084 sm->pmk_r1_len == SHA384_MAC_LEN) ||
1085 wpa_key_mgmt_sha384(sm->key_mgmt))
1086 mic_len = 24;
1087 else
1088 mic_len = 16;
1089
1090 if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce ||
1091 parse.fte_mic_len != mic_len) {
1092 wpa_printf(MSG_DEBUG,
1093 "FT: Invalid FTE (fte_mic_len=%zu mic_len=%zu)",
1094 parse.fte_mic_len, mic_len);
1095 goto fail;
1096 }
1097
1098 if (os_memcmp(parse.fte_snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
1099 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1100 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1101 parse.fte_snonce, WPA_NONCE_LEN);
1102 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1103 sm->snonce, WPA_NONCE_LEN);
1104 goto fail;
1105 }
1106
1107 if (os_memcmp(parse.fte_anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
1108 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1109 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1110 parse.fte_anonce, WPA_NONCE_LEN);
1111 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1112 sm->anonce, WPA_NONCE_LEN);
1113 goto fail;
1114 }
1115
1116 if (parse.r0kh_id == NULL) {
1117 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1118 goto fail;
1119 }
1120
1121 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1122 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1123 {
1124 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1125 "the current R0KH-ID");
1126 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1127 parse.r0kh_id, parse.r0kh_id_len);
1128 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1129 sm->r0kh_id, sm->r0kh_id_len);
1130 goto fail;
1131 }
1132
1133 if (parse.r1kh_id == NULL) {
1134 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1135 goto fail;
1136 }
1137
1138 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
1139 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1140 "ReassocResp");
1141 goto fail;
1142 }
1143
1144 if (parse.rsn_pmkid == NULL ||
1145 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1146 {
1147 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1148 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1149 goto fail;
1150 }
1151
1152 count = 3;
1153 if (parse.ric)
1154 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1155 if (parse.rsnxe)
1156 count++;
1157 if (parse.fte_elem_count != count) {
1158 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1159 "Control: received %u expected %u",
1160 parse.fte_elem_count, count);
1161 goto fail;
1162 }
1163
1164 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
1165 kck = sm->ptk.kck2;
1166 kck_len = sm->ptk.kck2_len;
1167 } else {
1168 kck = sm->ptk.kck;
1169 kck_len = sm->ptk.kck_len;
1170 }
1171
1172 if (wpa_ft_mic(sm->key_mgmt, kck, kck_len, sm->own_addr, src_addr, 6,
1173 parse.mdie - 2, parse.mdie_len + 2,
1174 parse.ftie - 2, parse.ftie_len + 2,
1175 parse.rsn - 2, parse.rsn_len + 2,
1176 parse.ric, parse.ric_len,
1177 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1178 parse.rsnxe ? parse.rsnxe_len + 2 : 0,
1179 NULL,
1180 mic) < 0) {
1181 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1182 goto fail;
1183 }
1184
1185 if (os_memcmp_const(mic, parse.fte_mic, mic_len) != 0) {
1186 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1187 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1188 parse.fte_mic, mic_len);
1189 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1190 goto fail;
1191 }
1192
1193 if (parse.fte_rsnxe_used && !sm->ap_rsnxe) {
1194 wpa_printf(MSG_INFO,
1195 "FT: FTE indicated that AP uses RSNXE, but RSNXE was not included in Beacon/Probe Response frames");
1196 goto fail;
1197 }
1198
1199 if (!sm->ap_rsn_ie) {
1200 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
1201 "FT: No RSNE for this AP known - trying to get from scan results");
1202 if (wpa_sm_get_beacon_ie(sm) < 0) {
1203 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1204 "FT: Could not find AP from the scan results");
1205 goto fail;
1206 }
1207 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
1208 "FT: Found the current AP from updated scan results");
1209 }
1210
1211 if (sm->ap_rsn_ie &&
1212 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
1213 sm->ap_rsn_ie, sm->ap_rsn_ie_len,
1214 parse.rsn - 2, parse.rsn_len + 2)) {
1215 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1216 "FT: RSNE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1217 wpa_hexdump(MSG_INFO, "RSNE in Beacon/ProbeResp",
1218 sm->ap_rsn_ie, sm->ap_rsn_ie_len);
1219 wpa_hexdump(MSG_INFO,
1220 "RSNE in FT protocol Reassociation Response frame",
1221 parse.rsn ? parse.rsn - 2 : NULL,
1222 parse.rsn ? parse.rsn_len + 2 : 0);
1223 goto fail;
1224 }
1225
1226 own_rsnxe_used = wpa_key_mgmt_sae(sm->key_mgmt) &&
1227 (sm->sae_pwe == SAE_PWE_HASH_TO_ELEMENT ||
1228 sm->sae_pwe == SAE_PWE_BOTH);
1229 if ((sm->ap_rsnxe && !parse.rsnxe && own_rsnxe_used) ||
1230 (!sm->ap_rsnxe && parse.rsnxe) ||
1231 (sm->ap_rsnxe && parse.rsnxe &&
1232 (sm->ap_rsnxe_len != 2 + parse.rsnxe_len ||
1233 os_memcmp(sm->ap_rsnxe, parse.rsnxe - 2,
1234 sm->ap_rsnxe_len) != 0))) {
1235 wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
1236 "FT: RSNXE mismatch between Beacon/ProbeResp and FT protocol Reassociation Response frame");
1237 wpa_hexdump(MSG_INFO, "RSNXE in Beacon/ProbeResp",
1238 sm->ap_rsnxe, sm->ap_rsnxe_len);
1239 wpa_hexdump(MSG_INFO,
1240 "RSNXE in FT protocol Reassociation Response frame",
1241 parse.rsnxe ? parse.rsnxe - 2 : NULL,
1242 parse.rsnxe ? parse.rsnxe_len + 2 : 0);
1243 goto fail;
1244 }
1245
1246 #ifdef CONFIG_OCV
1247 if (wpa_sm_ocv_enabled(sm)) {
1248 struct wpa_channel_info ci;
1249
1250 if (wpa_sm_channel_info(sm, &ci) != 0) {
1251 wpa_printf(MSG_WARNING,
1252 "Failed to get channel info to validate received OCI in (Re)Assoc Response");
1253 goto fail;
1254 }
1255
1256 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
1257 channel_width_to_int(ci.chanwidth),
1258 ci.seg1_idx) != OCI_SUCCESS) {
1259 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
1260 "addr=" MACSTR " frame=ft-assoc error=%s",
1261 MAC2STR(src_addr), ocv_errorstr);
1262 goto fail;
1263 }
1264 }
1265 #endif /* CONFIG_OCV */
1266
1267 sm->ft_reassoc_completed = 1;
1268
1269 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0 ||
1270 wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0 ||
1271 wpa_ft_process_bigtk_subelem(sm, parse.bigtk, parse.bigtk_len) < 0)
1272 goto fail;
1273
1274 if (sm->set_ptk_after_assoc) {
1275 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
1276 "are associated");
1277 if (wpa_ft_install_ptk(sm, src_addr) < 0)
1278 goto fail;
1279 sm->set_ptk_after_assoc = 0;
1280 }
1281
1282 if (parse.ric) {
1283 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
1284 parse.ric, parse.ric_len);
1285 /* TODO: parse response and inform driver about results when
1286 * using wpa_supplicant SME */
1287 }
1288
1289 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
1290
1291 ret = 0;
1292 fail:
1293 wpa_ft_parse_ies_free(&parse);
1294 return ret;
1295 }
1296
1297
1298 /**
1299 * wpa_ft_start_over_ds - Generate over-the-DS auth request
1300 * @sm: Pointer to WPA state machine data from wpa_sm_init()
1301 * @target_ap: Target AP Address
1302 * @mdie: Mobility Domain IE from the target AP
1303 * @force: Whether to force the request and ignore mobility domain differences
1304 * (only for testing purposes)
1305 * Returns: 0 on success, -1 on failure
1306 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie,bool force)1307 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1308 const u8 *mdie, bool force)
1309 {
1310 u8 *ft_ies;
1311 size_t ft_ies_len;
1312
1313 if (!force &&
1314 (!mdie || mdie[1] < 3 || !wpa_sm_has_ft_keys(sm, mdie + 2))) {
1315 wpa_printf(MSG_DEBUG, "FT: Cannot use over-the DS with " MACSTR
1316 " - no keys matching the mobility domain",
1317 MAC2STR(target_ap));
1318 return -1;
1319 }
1320
1321 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1322 MAC2STR(target_ap));
1323
1324 /* Generate a new SNonce */
1325 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1326 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1327 return -1;
1328 }
1329
1330 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1331 NULL, 0, target_ap, NULL, 0, mdie, 0);
1332 if (ft_ies) {
1333 sm->over_the_ds_in_progress = 1;
1334 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1335 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1336 os_free(ft_ies);
1337 }
1338
1339 return 0;
1340 }
1341
1342
1343 #ifdef CONFIG_PASN
1344
wpa_ft_pasn_get_r1kh(struct wpa_sm * sm,const u8 * bssid)1345 static struct pasn_ft_r1kh * wpa_ft_pasn_get_r1kh(struct wpa_sm *sm,
1346 const u8 *bssid)
1347 {
1348 size_t i;
1349
1350 for (i = 0; i < sm->n_pasn_r1kh; i++)
1351 if (ether_addr_equal(sm->pasn_r1kh[i].bssid, bssid))
1352 return &sm->pasn_r1kh[i];
1353
1354 return NULL;
1355 }
1356
1357
wpa_ft_pasn_store_r1kh(struct wpa_sm * sm,const u8 * bssid)1358 static void wpa_ft_pasn_store_r1kh(struct wpa_sm *sm, const u8 *bssid)
1359 {
1360 struct pasn_ft_r1kh *tmp = wpa_ft_pasn_get_r1kh(sm, bssid);
1361
1362 if (tmp)
1363 return;
1364
1365 tmp = os_realloc_array(sm->pasn_r1kh, sm->n_pasn_r1kh + 1,
1366 sizeof(*tmp));
1367 if (!tmp) {
1368 wpa_printf(MSG_DEBUG, "PASN: FT: Failed to store R1KH");
1369 return;
1370 }
1371
1372 sm->pasn_r1kh = tmp;
1373 tmp = &sm->pasn_r1kh[sm->n_pasn_r1kh];
1374
1375 wpa_printf(MSG_DEBUG, "PASN: FT: Store R1KH for " MACSTR,
1376 MAC2STR(bssid));
1377
1378 os_memcpy(tmp->bssid, bssid, ETH_ALEN);
1379 os_memcpy(tmp->r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN);
1380
1381 sm->n_pasn_r1kh++;
1382 }
1383
1384
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)1385 int wpa_pasn_ft_derive_pmk_r1(struct wpa_sm *sm, int akmp, const u8 *bssid,
1386 u8 *pmk_r1, size_t *pmk_r1_len, u8 *pmk_r1_name)
1387 {
1388 struct pasn_ft_r1kh *r1kh_entry;
1389
1390 if (sm->key_mgmt != (unsigned int) akmp) {
1391 wpa_printf(MSG_DEBUG,
1392 "PASN: FT: Key management mismatch: %u != %u",
1393 sm->key_mgmt, akmp);
1394 return -1;
1395 }
1396
1397 r1kh_entry = wpa_ft_pasn_get_r1kh(sm, bssid);
1398 if (!r1kh_entry) {
1399 wpa_printf(MSG_DEBUG,
1400 "PASN: FT: Cannot find R1KH-ID for " MACSTR,
1401 MAC2STR(bssid));
1402 return -1;
1403 }
1404
1405 /*
1406 * Note: PMK R0 etc. were already derived and are maintained by the
1407 * state machine, and as the same key hierarchy is used, there is no
1408 * need to derive them again, so only derive PMK R1 etc.
1409 */
1410 if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
1411 r1kh_entry->r1kh_id, sm->own_addr, pmk_r1,
1412 pmk_r1_name) < 0)
1413 return -1;
1414
1415 *pmk_r1_len = sm->pmk_r0_len;
1416
1417 wpa_hexdump_key(MSG_DEBUG, "PASN: FT: PMK-R1", pmk_r1, sm->pmk_r0_len);
1418 wpa_hexdump(MSG_DEBUG, "PASN: FT: PMKR1Name", pmk_r1_name,
1419 WPA_PMK_NAME_LEN);
1420
1421 return 0;
1422 }
1423
1424 #endif /* CONFIG_PASN */
1425
1426 #endif /* CONFIG_IEEE80211R */
1427