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      1 /*
      2  * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
      3  * Copyright (c) 2006-2007, Jouni Malinen <j (at) 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/random.h"
     14 #include "common/ieee802_11_defs.h"
     15 #include "common/ieee802_11_common.h"
     16 #include "wpa.h"
     17 #include "wpa_i.h"
     18 
     19 #ifdef CONFIG_IEEE80211R
     20 
     21 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
     22 		      const struct wpa_eapol_key *key,
     23 		      struct wpa_ptk *ptk, size_t ptk_len)
     24 {
     25 	u8 ptk_name[WPA_PMK_NAME_LEN];
     26 	const u8 *anonce = key->key_nonce;
     27 
     28 	if (sm->xxkey_len == 0) {
     29 		wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
     30 			   "derivation");
     31 		return -1;
     32 	}
     33 
     34 	wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
     35 			  sm->ssid_len, sm->mobility_domain,
     36 			  sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
     37 			  sm->pmk_r0, sm->pmk_r0_name);
     38 	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
     39 	wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
     40 		    sm->pmk_r0_name, WPA_PMK_NAME_LEN);
     41 	wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
     42 			  sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
     43 	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
     44 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
     45 		    WPA_PMK_NAME_LEN);
     46 	wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
     47 			  sm->bssid, sm->pmk_r1_name,
     48 			  (u8 *) ptk, ptk_len, ptk_name);
     49 	wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
     50 	wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
     51 
     52 	return 0;
     53 }
     54 
     55 
     56 /**
     57  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
     58  * @sm: Pointer to WPA state machine data from wpa_sm_init()
     59  * @ies: Association Response IEs or %NULL to clear FT parameters
     60  * @ies_len: Length of ies buffer in octets
     61  * Returns: 0 on success, -1 on failure
     62  */
     63 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
     64 {
     65 	struct wpa_ft_ies ft;
     66 
     67 	if (sm == NULL)
     68 		return 0;
     69 
     70 	if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
     71 		return -1;
     72 
     73 	if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
     74 		return -1;
     75 
     76 	if (ft.mdie) {
     77 		wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
     78 			    ft.mdie, MOBILITY_DOMAIN_ID_LEN);
     79 		os_memcpy(sm->mobility_domain, ft.mdie,
     80 			  MOBILITY_DOMAIN_ID_LEN);
     81 		sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
     82 		wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
     83 			   sm->mdie_ft_capab);
     84 	} else
     85 		os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
     86 
     87 	if (ft.r0kh_id) {
     88 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
     89 			    ft.r0kh_id, ft.r0kh_id_len);
     90 		os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
     91 		sm->r0kh_id_len = ft.r0kh_id_len;
     92 	} else {
     93 		/* FIX: When should R0KH-ID be cleared? We need to keep the
     94 		 * old R0KH-ID in order to be able to use this during FT. */
     95 		/*
     96 		 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
     97 		 * sm->r0kh_id_len = 0;
     98 		 */
     99 	}
    100 
    101 	if (ft.r1kh_id) {
    102 		wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
    103 			    ft.r1kh_id, FT_R1KH_ID_LEN);
    104 		os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
    105 	} else
    106 		os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
    107 
    108 	os_free(sm->assoc_resp_ies);
    109 	sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
    110 	if (sm->assoc_resp_ies) {
    111 		u8 *pos = sm->assoc_resp_ies;
    112 		if (ft.mdie) {
    113 			os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
    114 			pos += ft.mdie_len + 2;
    115 		}
    116 		if (ft.ftie) {
    117 			os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
    118 			pos += ft.ftie_len + 2;
    119 		}
    120 		sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
    121 		wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
    122 			    "(Re)Association Response",
    123 			    sm->assoc_resp_ies, sm->assoc_resp_ies_len);
    124 	}
    125 
    126 	return 0;
    127 }
    128 
    129 
    130 /**
    131  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
    132  * @sm: Pointer to WPA state machine data from wpa_sm_init()
    133  * @len: Buffer for returning the length of the IEs
    134  * @anonce: ANonce or %NULL if not yet available
    135  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
    136  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
    137  * @target_ap: Target AP address
    138  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
    139  * @ric_ies_len: Length of ric_ies buffer in octets
    140  * @ap_mdie: Mobility Domain IE from the target AP
    141  * Returns: Pointer to buffer with IEs or %NULL on failure
    142  *
    143  * Caller is responsible for freeing the returned buffer with os_free();
    144  */
    145 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
    146 			       const u8 *anonce, const u8 *pmk_name,
    147 			       const u8 *kck, const u8 *target_ap,
    148 			       const u8 *ric_ies, size_t ric_ies_len,
    149 			       const u8 *ap_mdie)
    150 {
    151 	size_t buf_len;
    152 	u8 *buf, *pos, *ftie_len, *ftie_pos;
    153 	struct rsn_mdie *mdie;
    154 	struct rsn_ftie *ftie;
    155 	struct rsn_ie_hdr *rsnie;
    156 	u16 capab;
    157 
    158 	sm->ft_completed = 0;
    159 
    160 	buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
    161 		2 + sm->r0kh_id_len + ric_ies_len + 100;
    162 	buf = os_zalloc(buf_len);
    163 	if (buf == NULL)
    164 		return NULL;
    165 	pos = buf;
    166 
    167 	/* RSNIE[PMKR0Name/PMKR1Name] */
    168 	rsnie = (struct rsn_ie_hdr *) pos;
    169 	rsnie->elem_id = WLAN_EID_RSN;
    170 	WPA_PUT_LE16(rsnie->version, RSN_VERSION);
    171 	pos = (u8 *) (rsnie + 1);
    172 
    173 	/* Group Suite Selector */
    174 	if (sm->group_cipher != WPA_CIPHER_CCMP &&
    175 	    sm->group_cipher != WPA_CIPHER_GCMP &&
    176 	    sm->group_cipher != WPA_CIPHER_TKIP) {
    177 		wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
    178 			   sm->group_cipher);
    179 		os_free(buf);
    180 		return NULL;
    181 	}
    182 	RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
    183 						  sm->group_cipher));
    184 	pos += RSN_SELECTOR_LEN;
    185 
    186 	/* Pairwise Suite Count */
    187 	WPA_PUT_LE16(pos, 1);
    188 	pos += 2;
    189 
    190 	/* Pairwise Suite List */
    191 	if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
    192 		wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
    193 			   sm->pairwise_cipher);
    194 		os_free(buf);
    195 		return NULL;
    196 	}
    197 	RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
    198 						  sm->pairwise_cipher));
    199 	pos += RSN_SELECTOR_LEN;
    200 
    201 	/* Authenticated Key Management Suite Count */
    202 	WPA_PUT_LE16(pos, 1);
    203 	pos += 2;
    204 
    205 	/* Authenticated Key Management Suite List */
    206 	if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
    207 		RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
    208 	else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
    209 		RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
    210 	else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
    211 		RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
    212 	else {
    213 		wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
    214 			   sm->key_mgmt);
    215 		os_free(buf);
    216 		return NULL;
    217 	}
    218 	pos += RSN_SELECTOR_LEN;
    219 
    220 	/* RSN Capabilities */
    221 	capab = 0;
    222 #ifdef CONFIG_IEEE80211W
    223 	if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
    224 		capab |= WPA_CAPABILITY_MFPC;
    225 #endif /* CONFIG_IEEE80211W */
    226 	WPA_PUT_LE16(pos, capab);
    227 	pos += 2;
    228 
    229 	/* PMKID Count */
    230 	WPA_PUT_LE16(pos, 1);
    231 	pos += 2;
    232 
    233 	/* PMKID List [PMKR0Name/PMKR1Name] */
    234 	os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
    235 	pos += WPA_PMK_NAME_LEN;
    236 
    237 #ifdef CONFIG_IEEE80211W
    238 	if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
    239 		/* Management Group Cipher Suite */
    240 		RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
    241 		pos += RSN_SELECTOR_LEN;
    242 	}
    243 #endif /* CONFIG_IEEE80211W */
    244 
    245 	rsnie->len = (pos - (u8 *) rsnie) - 2;
    246 
    247 	/* MDIE */
    248 	*pos++ = WLAN_EID_MOBILITY_DOMAIN;
    249 	*pos++ = sizeof(*mdie);
    250 	mdie = (struct rsn_mdie *) pos;
    251 	pos += sizeof(*mdie);
    252 	os_memcpy(mdie->mobility_domain, sm->mobility_domain,
    253 		  MOBILITY_DOMAIN_ID_LEN);
    254 	mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
    255 		sm->mdie_ft_capab;
    256 
    257 	/* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
    258 	ftie_pos = pos;
    259 	*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
    260 	ftie_len = pos++;
    261 	ftie = (struct rsn_ftie *) pos;
    262 	pos += sizeof(*ftie);
    263 	os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
    264 	if (anonce)
    265 		os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
    266 	if (kck) {
    267 		/* R1KH-ID sub-element in third FT message */
    268 		*pos++ = FTIE_SUBELEM_R1KH_ID;
    269 		*pos++ = FT_R1KH_ID_LEN;
    270 		os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
    271 		pos += FT_R1KH_ID_LEN;
    272 	}
    273 	/* R0KH-ID sub-element */
    274 	*pos++ = FTIE_SUBELEM_R0KH_ID;
    275 	*pos++ = sm->r0kh_id_len;
    276 	os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
    277 	pos += sm->r0kh_id_len;
    278 	*ftie_len = pos - ftie_len - 1;
    279 
    280 	if (ric_ies) {
    281 		/* RIC Request */
    282 		os_memcpy(pos, ric_ies, ric_ies_len);
    283 		pos += ric_ies_len;
    284 	}
    285 
    286 	if (kck) {
    287 		/*
    288 		 * IEEE Std 802.11r-2008, 11A.8.4
    289 		 * MIC shall be calculated over:
    290 		 * non-AP STA MAC address
    291 		 * Target AP MAC address
    292 		 * Transaction seq number (5 for ReassocReq, 3 otherwise)
    293 		 * RSN IE
    294 		 * MDIE
    295 		 * FTIE (with MIC field set to 0)
    296 		 * RIC-Request (if present)
    297 		 */
    298 		/* Information element count */
    299 		ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
    300 							       ric_ies_len);
    301 		if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
    302 			       ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
    303 			       ftie_pos, 2 + *ftie_len,
    304 			       (u8 *) rsnie, 2 + rsnie->len, ric_ies,
    305 			       ric_ies_len, ftie->mic) < 0) {
    306 			wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
    307 			os_free(buf);
    308 			return NULL;
    309 		}
    310 	}
    311 
    312 	*len = pos - buf;
    313 
    314 	return buf;
    315 }
    316 
    317 
    318 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
    319 {
    320 	int keylen;
    321 	enum wpa_alg alg;
    322 	u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
    323 
    324 	wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
    325 
    326 	if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
    327 		wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
    328 			   sm->pairwise_cipher);
    329 		return -1;
    330 	}
    331 
    332 	alg = wpa_cipher_to_alg(sm->pairwise_cipher);
    333 	keylen = wpa_cipher_key_len(sm->pairwise_cipher);
    334 
    335 	if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
    336 			   sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
    337 		wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
    338 		return -1;
    339 	}
    340 
    341 	return 0;
    342 }
    343 
    344 
    345 /**
    346  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
    347  * @sm: Pointer to WPA state machine data from wpa_sm_init()
    348  * @mdie: Target AP MDIE
    349  * Returns: 0 on success, -1 on failure
    350  */
    351 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
    352 {
    353 	u8 *ft_ies;
    354 	size_t ft_ies_len;
    355 
    356 	/* Generate a new SNonce */
    357 	if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
    358 		wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
    359 		return -1;
    360 	}
    361 
    362 	ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
    363 				    NULL, sm->bssid, NULL, 0, mdie);
    364 	if (ft_ies) {
    365 		wpa_sm_update_ft_ies(sm, sm->mobility_domain,
    366 				     ft_ies, ft_ies_len);
    367 		os_free(ft_ies);
    368 	}
    369 
    370 	return 0;
    371 }
    372 
    373 
    374 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
    375 			    int ft_action, const u8 *target_ap,
    376 			    const u8 *ric_ies, size_t ric_ies_len)
    377 {
    378 	u8 *ft_ies;
    379 	size_t ft_ies_len, ptk_len;
    380 	struct wpa_ft_ies parse;
    381 	struct rsn_mdie *mdie;
    382 	struct rsn_ftie *ftie;
    383 	u8 ptk_name[WPA_PMK_NAME_LEN];
    384 	int ret;
    385 	const u8 *bssid;
    386 
    387 	wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
    388 	wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
    389 
    390 	if (ft_action) {
    391 		if (!sm->over_the_ds_in_progress) {
    392 			wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
    393 				   "- drop FT Action Response");
    394 			return -1;
    395 		}
    396 
    397 		if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
    398 			wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
    399 				   "with this Target AP - drop FT Action "
    400 				   "Response");
    401 			return -1;
    402 		}
    403 	}
    404 
    405 	if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
    406 		wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
    407 			   "enabled for this connection");
    408 		return -1;
    409 	}
    410 
    411 	if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
    412 		wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
    413 		return -1;
    414 	}
    415 
    416 	mdie = (struct rsn_mdie *) parse.mdie;
    417 	if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
    418 	    os_memcmp(mdie->mobility_domain, sm->mobility_domain,
    419 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
    420 		wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
    421 		return -1;
    422 	}
    423 
    424 	ftie = (struct rsn_ftie *) parse.ftie;
    425 	if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
    426 		wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
    427 		return -1;
    428 	}
    429 
    430 	if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
    431 		wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
    432 		wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
    433 			    ftie->snonce, WPA_NONCE_LEN);
    434 		wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
    435 			    sm->snonce, WPA_NONCE_LEN);
    436 		return -1;
    437 	}
    438 
    439 	if (parse.r0kh_id == NULL) {
    440 		wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
    441 		return -1;
    442 	}
    443 
    444 	if (parse.r0kh_id_len != sm->r0kh_id_len ||
    445 	    os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
    446 	{
    447 		wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
    448 			   "the current R0KH-ID");
    449 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
    450 			    parse.r0kh_id, parse.r0kh_id_len);
    451 		wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
    452 			    sm->r0kh_id, sm->r0kh_id_len);
    453 		return -1;
    454 	}
    455 
    456 	if (parse.r1kh_id == NULL) {
    457 		wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
    458 		return -1;
    459 	}
    460 
    461 	if (parse.rsn_pmkid == NULL ||
    462 	    os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
    463 	{
    464 		wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
    465 			   "RSNIE");
    466 		return -1;
    467 	}
    468 
    469 	os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
    470 	wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
    471 	wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
    472 	wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
    473 	os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
    474 	wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
    475 			  sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
    476 	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
    477 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
    478 		    sm->pmk_r1_name, WPA_PMK_NAME_LEN);
    479 
    480 	bssid = target_ap;
    481 	ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
    482 	wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
    483 			  bssid, sm->pmk_r1_name,
    484 			  (u8 *) &sm->ptk, ptk_len, ptk_name);
    485 	wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
    486 			(u8 *) &sm->ptk, ptk_len);
    487 	wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
    488 
    489 	ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
    490 				    sm->pmk_r1_name, sm->ptk.kck, bssid,
    491 				    ric_ies, ric_ies_len,
    492 				    parse.mdie ? parse.mdie - 2 : NULL);
    493 	if (ft_ies) {
    494 		wpa_sm_update_ft_ies(sm, sm->mobility_domain,
    495 				     ft_ies, ft_ies_len);
    496 		os_free(ft_ies);
    497 	}
    498 
    499 	wpa_sm_mark_authenticated(sm, bssid);
    500 	ret = wpa_ft_install_ptk(sm, bssid);
    501 	if (ret) {
    502 		/*
    503 		 * Some drivers do not support key configuration when we are
    504 		 * not associated with the target AP. Work around this by
    505 		 * trying again after the following reassociation gets
    506 		 * completed.
    507 		 */
    508 		wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
    509 			   "association - try again after reassociation");
    510 		sm->set_ptk_after_assoc = 1;
    511 	} else
    512 		sm->set_ptk_after_assoc = 0;
    513 
    514 	sm->ft_completed = 1;
    515 	if (ft_action) {
    516 		/*
    517 		 * The caller is expected trigger re-association with the
    518 		 * Target AP.
    519 		 */
    520 		os_memcpy(sm->bssid, target_ap, ETH_ALEN);
    521 	}
    522 
    523 	return 0;
    524 }
    525 
    526 
    527 int wpa_ft_is_completed(struct wpa_sm *sm)
    528 {
    529 	if (sm == NULL)
    530 		return 0;
    531 
    532 	if (!wpa_key_mgmt_ft(sm->key_mgmt))
    533 		return 0;
    534 
    535 	return sm->ft_completed;
    536 }
    537 
    538 
    539 void wpa_reset_ft_completed(struct wpa_sm *sm)
    540 {
    541 	if (sm != NULL)
    542 		sm->ft_completed = 0;
    543 }
    544 
    545 
    546 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
    547 				      size_t gtk_elem_len)
    548 {
    549 	u8 gtk[32];
    550 	int keyidx;
    551 	enum wpa_alg alg;
    552 	size_t gtk_len, keylen, rsc_len;
    553 
    554 	if (gtk_elem == NULL) {
    555 		wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
    556 		return 0;
    557 	}
    558 
    559 	wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
    560 			gtk_elem, gtk_elem_len);
    561 
    562 	if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
    563 	    gtk_elem_len - 19 > sizeof(gtk)) {
    564 		wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
    565 			   "length %lu", (unsigned long) gtk_elem_len);
    566 		return -1;
    567 	}
    568 	gtk_len = gtk_elem_len - 19;
    569 	if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
    570 		wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
    571 			   "decrypt GTK");
    572 		return -1;
    573 	}
    574 
    575 	keylen = wpa_cipher_key_len(sm->group_cipher);
    576 	rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
    577 	alg = wpa_cipher_to_alg(sm->group_cipher);
    578 	if (alg == WPA_ALG_NONE) {
    579 		wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
    580 			   sm->group_cipher);
    581 		return -1;
    582 	}
    583 
    584 	if (gtk_len < keylen) {
    585 		wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
    586 		return -1;
    587 	}
    588 
    589 	/* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
    590 
    591 	keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
    592 
    593 	if (gtk_elem[2] != keylen) {
    594 		wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
    595 			   "negotiated %lu",
    596 			   gtk_elem[2], (unsigned long) keylen);
    597 		return -1;
    598 	}
    599 
    600 	wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
    601 	if (sm->group_cipher == WPA_CIPHER_TKIP) {
    602 		/* Swap Tx/Rx keys for Michael MIC */
    603 		u8 tmp[8];
    604 		os_memcpy(tmp, gtk + 16, 8);
    605 		os_memcpy(gtk + 16, gtk + 24, 8);
    606 		os_memcpy(gtk + 24, tmp, 8);
    607 	}
    608 	if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
    609 			   gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
    610 		wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
    611 			   "driver.");
    612 		return -1;
    613 	}
    614 
    615 	return 0;
    616 }
    617 
    618 
    619 #ifdef CONFIG_IEEE80211W
    620 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
    621 				       size_t igtk_elem_len)
    622 {
    623 	u8 igtk[WPA_IGTK_LEN];
    624 	u16 keyidx;
    625 
    626 	if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
    627 		return 0;
    628 
    629 	if (igtk_elem == NULL) {
    630 		wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
    631 		return 0;
    632 	}
    633 
    634 	wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
    635 			igtk_elem, igtk_elem_len);
    636 
    637 	if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
    638 		wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
    639 			   "length %lu", (unsigned long) igtk_elem_len);
    640 		return -1;
    641 	}
    642 	if (igtk_elem[8] != WPA_IGTK_LEN) {
    643 		wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
    644 			   "%d", igtk_elem[8]);
    645 		return -1;
    646 	}
    647 
    648 	if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
    649 		wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
    650 			   "decrypt IGTK");
    651 		return -1;
    652 	}
    653 
    654 	/* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
    655 
    656 	keyidx = WPA_GET_LE16(igtk_elem);
    657 
    658 	wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
    659 			WPA_IGTK_LEN);
    660 	if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
    661 			   igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
    662 		wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
    663 			   "driver.");
    664 		return -1;
    665 	}
    666 
    667 	return 0;
    668 }
    669 #endif /* CONFIG_IEEE80211W */
    670 
    671 
    672 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
    673 				 size_t ies_len, const u8 *src_addr)
    674 {
    675 	struct wpa_ft_ies parse;
    676 	struct rsn_mdie *mdie;
    677 	struct rsn_ftie *ftie;
    678 	unsigned int count;
    679 	u8 mic[16];
    680 
    681 	wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
    682 
    683 	if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
    684 		wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
    685 			   "enabled for this connection");
    686 		return -1;
    687 	}
    688 
    689 	if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
    690 		wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
    691 		return -1;
    692 	}
    693 
    694 	mdie = (struct rsn_mdie *) parse.mdie;
    695 	if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
    696 	    os_memcmp(mdie->mobility_domain, sm->mobility_domain,
    697 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
    698 		wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
    699 		return -1;
    700 	}
    701 
    702 	ftie = (struct rsn_ftie *) parse.ftie;
    703 	if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
    704 		wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
    705 		return -1;
    706 	}
    707 
    708 	if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
    709 		wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
    710 		wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
    711 			    ftie->snonce, WPA_NONCE_LEN);
    712 		wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
    713 			    sm->snonce, WPA_NONCE_LEN);
    714 		return -1;
    715 	}
    716 
    717 	if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
    718 		wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
    719 		wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
    720 			    ftie->anonce, WPA_NONCE_LEN);
    721 		wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
    722 			    sm->anonce, WPA_NONCE_LEN);
    723 		return -1;
    724 	}
    725 
    726 	if (parse.r0kh_id == NULL) {
    727 		wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
    728 		return -1;
    729 	}
    730 
    731 	if (parse.r0kh_id_len != sm->r0kh_id_len ||
    732 	    os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
    733 	{
    734 		wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
    735 			   "the current R0KH-ID");
    736 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
    737 			    parse.r0kh_id, parse.r0kh_id_len);
    738 		wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
    739 			    sm->r0kh_id, sm->r0kh_id_len);
    740 		return -1;
    741 	}
    742 
    743 	if (parse.r1kh_id == NULL) {
    744 		wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
    745 		return -1;
    746 	}
    747 
    748 	if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
    749 		wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
    750 			   "ReassocResp");
    751 		return -1;
    752 	}
    753 
    754 	if (parse.rsn_pmkid == NULL ||
    755 	    os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
    756 	{
    757 		wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
    758 			   "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
    759 		return -1;
    760 	}
    761 
    762 	count = 3;
    763 	if (parse.ric)
    764 		count += ieee802_11_ie_count(parse.ric, parse.ric_len);
    765 	if (ftie->mic_control[1] != count) {
    766 		wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
    767 			   "Control: received %u expected %u",
    768 			   ftie->mic_control[1], count);
    769 		return -1;
    770 	}
    771 
    772 	if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
    773 		       parse.mdie - 2, parse.mdie_len + 2,
    774 		       parse.ftie - 2, parse.ftie_len + 2,
    775 		       parse.rsn - 2, parse.rsn_len + 2,
    776 		       parse.ric, parse.ric_len,
    777 		       mic) < 0) {
    778 		wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
    779 		return -1;
    780 	}
    781 
    782 	if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
    783 		wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
    784 		wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
    785 		wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
    786 		return -1;
    787 	}
    788 
    789 	if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
    790 		return -1;
    791 
    792 #ifdef CONFIG_IEEE80211W
    793 	if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
    794 		return -1;
    795 #endif /* CONFIG_IEEE80211W */
    796 
    797 	if (sm->set_ptk_after_assoc) {
    798 		wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
    799 			   "are associated");
    800 		if (wpa_ft_install_ptk(sm, src_addr) < 0)
    801 			return -1;
    802 		sm->set_ptk_after_assoc = 0;
    803 	}
    804 
    805 	if (parse.ric) {
    806 		wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
    807 			    parse.ric, parse.ric_len);
    808 		/* TODO: parse response and inform driver about results when
    809 		 * using wpa_supplicant SME */
    810 	}
    811 
    812 	wpa_printf(MSG_DEBUG, "FT: Completed successfully");
    813 
    814 	return 0;
    815 }
    816 
    817 
    818 /**
    819  * wpa_ft_start_over_ds - Generate over-the-DS auth request
    820  * @sm: Pointer to WPA state machine data from wpa_sm_init()
    821  * @target_ap: Target AP Address
    822  * @mdie: Mobility Domain IE from the target AP
    823  * Returns: 0 on success, -1 on failure
    824  */
    825 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
    826 			 const u8 *mdie)
    827 {
    828 	u8 *ft_ies;
    829 	size_t ft_ies_len;
    830 
    831 	wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
    832 		   MAC2STR(target_ap));
    833 
    834 	/* Generate a new SNonce */
    835 	if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
    836 		wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
    837 		return -1;
    838 	}
    839 
    840 	ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
    841 				    NULL, target_ap, NULL, 0, mdie);
    842 	if (ft_ies) {
    843 		sm->over_the_ds_in_progress = 1;
    844 		os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
    845 		wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
    846 		os_free(ft_ies);
    847 	}
    848 
    849 	return 0;
    850 }
    851 
    852 #endif /* CONFIG_IEEE80211R */
    853