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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 {
    211 		wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
    212 			   sm->key_mgmt);
    213 		os_free(buf);
    214 		return NULL;
    215 	}
    216 	pos += RSN_SELECTOR_LEN;
    217 
    218 	/* RSN Capabilities */
    219 	capab = 0;
    220 #ifdef CONFIG_IEEE80211W
    221 	if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
    222 		capab |= WPA_CAPABILITY_MFPC;
    223 #endif /* CONFIG_IEEE80211W */
    224 	WPA_PUT_LE16(pos, capab);
    225 	pos += 2;
    226 
    227 	/* PMKID Count */
    228 	WPA_PUT_LE16(pos, 1);
    229 	pos += 2;
    230 
    231 	/* PMKID List [PMKR0Name/PMKR1Name] */
    232 	os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
    233 	pos += WPA_PMK_NAME_LEN;
    234 
    235 #ifdef CONFIG_IEEE80211W
    236 	if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
    237 		/* Management Group Cipher Suite */
    238 		RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
    239 		pos += RSN_SELECTOR_LEN;
    240 	}
    241 #endif /* CONFIG_IEEE80211W */
    242 
    243 	rsnie->len = (pos - (u8 *) rsnie) - 2;
    244 
    245 	/* MDIE */
    246 	*pos++ = WLAN_EID_MOBILITY_DOMAIN;
    247 	*pos++ = sizeof(*mdie);
    248 	mdie = (struct rsn_mdie *) pos;
    249 	pos += sizeof(*mdie);
    250 	os_memcpy(mdie->mobility_domain, sm->mobility_domain,
    251 		  MOBILITY_DOMAIN_ID_LEN);
    252 	mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
    253 		sm->mdie_ft_capab;
    254 
    255 	/* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
    256 	ftie_pos = pos;
    257 	*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
    258 	ftie_len = pos++;
    259 	ftie = (struct rsn_ftie *) pos;
    260 	pos += sizeof(*ftie);
    261 	os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
    262 	if (anonce)
    263 		os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
    264 	if (kck) {
    265 		/* R1KH-ID sub-element in third FT message */
    266 		*pos++ = FTIE_SUBELEM_R1KH_ID;
    267 		*pos++ = FT_R1KH_ID_LEN;
    268 		os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
    269 		pos += FT_R1KH_ID_LEN;
    270 	}
    271 	/* R0KH-ID sub-element */
    272 	*pos++ = FTIE_SUBELEM_R0KH_ID;
    273 	*pos++ = sm->r0kh_id_len;
    274 	os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
    275 	pos += sm->r0kh_id_len;
    276 	*ftie_len = pos - ftie_len - 1;
    277 
    278 	if (ric_ies) {
    279 		/* RIC Request */
    280 		os_memcpy(pos, ric_ies, ric_ies_len);
    281 		pos += ric_ies_len;
    282 	}
    283 
    284 	if (kck) {
    285 		/*
    286 		 * IEEE Std 802.11r-2008, 11A.8.4
    287 		 * MIC shall be calculated over:
    288 		 * non-AP STA MAC address
    289 		 * Target AP MAC address
    290 		 * Transaction seq number (5 for ReassocReq, 3 otherwise)
    291 		 * RSN IE
    292 		 * MDIE
    293 		 * FTIE (with MIC field set to 0)
    294 		 * RIC-Request (if present)
    295 		 */
    296 		/* Information element count */
    297 		ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
    298 							       ric_ies_len);
    299 		if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
    300 			       ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
    301 			       ftie_pos, 2 + *ftie_len,
    302 			       (u8 *) rsnie, 2 + rsnie->len, ric_ies,
    303 			       ric_ies_len, ftie->mic) < 0) {
    304 			wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
    305 			os_free(buf);
    306 			return NULL;
    307 		}
    308 	}
    309 
    310 	*len = pos - buf;
    311 
    312 	return buf;
    313 }
    314 
    315 
    316 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
    317 {
    318 	int keylen;
    319 	enum wpa_alg alg;
    320 	u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
    321 
    322 	wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
    323 
    324 	if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
    325 		wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
    326 			   sm->pairwise_cipher);
    327 		return -1;
    328 	}
    329 
    330 	alg = wpa_cipher_to_alg(sm->pairwise_cipher);
    331 	keylen = wpa_cipher_key_len(sm->pairwise_cipher);
    332 
    333 	if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
    334 			   sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
    335 		wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
    336 		return -1;
    337 	}
    338 
    339 	return 0;
    340 }
    341 
    342 
    343 /**
    344  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
    345  * @sm: Pointer to WPA state machine data from wpa_sm_init()
    346  * @mdie: Target AP MDIE
    347  * Returns: 0 on success, -1 on failure
    348  */
    349 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
    350 {
    351 	u8 *ft_ies;
    352 	size_t ft_ies_len;
    353 
    354 	/* Generate a new SNonce */
    355 	if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
    356 		wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
    357 		return -1;
    358 	}
    359 
    360 	ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
    361 				    NULL, sm->bssid, NULL, 0, mdie);
    362 	if (ft_ies) {
    363 		wpa_sm_update_ft_ies(sm, sm->mobility_domain,
    364 				     ft_ies, ft_ies_len);
    365 		os_free(ft_ies);
    366 	}
    367 
    368 	return 0;
    369 }
    370 
    371 
    372 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
    373 			    int ft_action, const u8 *target_ap,
    374 			    const u8 *ric_ies, size_t ric_ies_len)
    375 {
    376 	u8 *ft_ies;
    377 	size_t ft_ies_len, ptk_len;
    378 	struct wpa_ft_ies parse;
    379 	struct rsn_mdie *mdie;
    380 	struct rsn_ftie *ftie;
    381 	u8 ptk_name[WPA_PMK_NAME_LEN];
    382 	int ret;
    383 	const u8 *bssid;
    384 
    385 	wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
    386 	wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
    387 
    388 	if (ft_action) {
    389 		if (!sm->over_the_ds_in_progress) {
    390 			wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
    391 				   "- drop FT Action Response");
    392 			return -1;
    393 		}
    394 
    395 		if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
    396 			wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
    397 				   "with this Target AP - drop FT Action "
    398 				   "Response");
    399 			return -1;
    400 		}
    401 	}
    402 
    403 	if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
    404 	    sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
    405 		wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
    406 			   "enabled for this connection");
    407 		return -1;
    408 	}
    409 
    410 	if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
    411 		wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
    412 		return -1;
    413 	}
    414 
    415 	mdie = (struct rsn_mdie *) parse.mdie;
    416 	if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
    417 	    os_memcmp(mdie->mobility_domain, sm->mobility_domain,
    418 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
    419 		wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
    420 		return -1;
    421 	}
    422 
    423 	ftie = (struct rsn_ftie *) parse.ftie;
    424 	if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
    425 		wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
    426 		return -1;
    427 	}
    428 
    429 	if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
    430 		wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
    431 		wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
    432 			    ftie->snonce, WPA_NONCE_LEN);
    433 		wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
    434 			    sm->snonce, WPA_NONCE_LEN);
    435 		return -1;
    436 	}
    437 
    438 	if (parse.r0kh_id == NULL) {
    439 		wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
    440 		return -1;
    441 	}
    442 
    443 	if (parse.r0kh_id_len != sm->r0kh_id_len ||
    444 	    os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
    445 		wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
    446 			   "the current R0KH-ID");
    447 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
    448 			    parse.r0kh_id, parse.r0kh_id_len);
    449 		wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
    450 			    sm->r0kh_id, sm->r0kh_id_len);
    451 		return -1;
    452 	}
    453 
    454 	if (parse.r1kh_id == NULL) {
    455 		wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
    456 		return -1;
    457 	}
    458 
    459 	if (parse.rsn_pmkid == NULL ||
    460 	    os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
    461 		wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
    462 			   "RSNIE");
    463 		return -1;
    464 	}
    465 
    466 	os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
    467 	wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
    468 	wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
    469 	wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
    470 	os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
    471 	wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
    472 			  sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
    473 	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
    474 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
    475 		    sm->pmk_r1_name, WPA_PMK_NAME_LEN);
    476 
    477 	bssid = target_ap;
    478 	ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
    479 	wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
    480 			  bssid, sm->pmk_r1_name,
    481 			  (u8 *) &sm->ptk, ptk_len, ptk_name);
    482 	wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
    483 			(u8 *) &sm->ptk, ptk_len);
    484 	wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
    485 
    486 	ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
    487 				    sm->pmk_r1_name, sm->ptk.kck, bssid,
    488 				    ric_ies, ric_ies_len,
    489 				    parse.mdie ? parse.mdie - 2 : NULL);
    490 	if (ft_ies) {
    491 		wpa_sm_update_ft_ies(sm, sm->mobility_domain,
    492 				     ft_ies, ft_ies_len);
    493 		os_free(ft_ies);
    494 	}
    495 
    496 	wpa_sm_mark_authenticated(sm, bssid);
    497 	ret = wpa_ft_install_ptk(sm, bssid);
    498 	if (ret) {
    499 		/*
    500 		 * Some drivers do not support key configuration when we are
    501 		 * not associated with the target AP. Work around this by
    502 		 * trying again after the following reassociation gets
    503 		 * completed.
    504 		 */
    505 		wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
    506 			   "association - try again after reassociation");
    507 		sm->set_ptk_after_assoc = 1;
    508 	} else
    509 		sm->set_ptk_after_assoc = 0;
    510 
    511 	sm->ft_completed = 1;
    512 	if (ft_action) {
    513 		/*
    514 		 * The caller is expected trigger re-association with the
    515 		 * Target AP.
    516 		 */
    517 		os_memcpy(sm->bssid, target_ap, ETH_ALEN);
    518 	}
    519 
    520 	return 0;
    521 }
    522 
    523 
    524 int wpa_ft_is_completed(struct wpa_sm *sm)
    525 {
    526 	if (sm == NULL)
    527 		return 0;
    528 
    529 	if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
    530 	    sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
    531 		return 0;
    532 
    533 	return sm->ft_completed;
    534 }
    535 
    536 
    537 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
    538 				      size_t gtk_elem_len)
    539 {
    540 	u8 gtk[32];
    541 	int keyidx;
    542 	enum wpa_alg alg;
    543 	size_t gtk_len, keylen, rsc_len;
    544 
    545 	if (gtk_elem == NULL) {
    546 		wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
    547 		return 0;
    548 	}
    549 
    550 	wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
    551 			gtk_elem, gtk_elem_len);
    552 
    553 	if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
    554 	    gtk_elem_len - 19 > sizeof(gtk)) {
    555 		wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
    556 			   "length %lu", (unsigned long) gtk_elem_len);
    557 		return -1;
    558 	}
    559 	gtk_len = gtk_elem_len - 19;
    560 	if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
    561 		wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
    562 			   "decrypt GTK");
    563 		return -1;
    564 	}
    565 
    566 	keylen = wpa_cipher_key_len(sm->group_cipher);
    567 	rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
    568 	alg = wpa_cipher_to_alg(sm->group_cipher);
    569 	if (alg == WPA_ALG_NONE) {
    570 		wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
    571 			   sm->group_cipher);
    572 		return -1;
    573 	}
    574 
    575 	if (gtk_len < keylen) {
    576 		wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
    577 		return -1;
    578 	}
    579 
    580 	/* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
    581 
    582 	keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
    583 
    584 	if (gtk_elem[2] != keylen) {
    585 		wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
    586 			   "negotiated %lu",
    587 			   gtk_elem[2], (unsigned long) keylen);
    588 		return -1;
    589 	}
    590 
    591 	wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
    592 	if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
    593 			   gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
    594 		wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
    595 			   "driver.");
    596 		return -1;
    597 	}
    598 
    599 	return 0;
    600 }
    601 
    602 
    603 #ifdef CONFIG_IEEE80211W
    604 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
    605 				       size_t igtk_elem_len)
    606 {
    607 	u8 igtk[WPA_IGTK_LEN];
    608 	u16 keyidx;
    609 
    610 	if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
    611 		return 0;
    612 
    613 	if (igtk_elem == NULL) {
    614 		wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
    615 		return 0;
    616 	}
    617 
    618 	wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
    619 			igtk_elem, igtk_elem_len);
    620 
    621 	if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
    622 		wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
    623 			   "length %lu", (unsigned long) igtk_elem_len);
    624 		return -1;
    625 	}
    626 	if (igtk_elem[8] != WPA_IGTK_LEN) {
    627 		wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
    628 			   "%d", igtk_elem[8]);
    629 		return -1;
    630 	}
    631 
    632 	if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
    633 		wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
    634 			   "decrypt IGTK");
    635 		return -1;
    636 	}
    637 
    638 	/* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
    639 
    640 	keyidx = WPA_GET_LE16(igtk_elem);
    641 
    642 	wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
    643 			WPA_IGTK_LEN);
    644 	if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
    645 			   igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
    646 		wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
    647 			   "driver.");
    648 		return -1;
    649 	}
    650 
    651 	return 0;
    652 }
    653 #endif /* CONFIG_IEEE80211W */
    654 
    655 
    656 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
    657 				 size_t ies_len, const u8 *src_addr)
    658 {
    659 	struct wpa_ft_ies parse;
    660 	struct rsn_mdie *mdie;
    661 	struct rsn_ftie *ftie;
    662 	unsigned int count;
    663 	u8 mic[16];
    664 
    665 	wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
    666 
    667 	if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
    668 	    sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
    669 		wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
    670 			   "enabled for this connection");
    671 		return -1;
    672 	}
    673 
    674 	if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
    675 		wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
    676 		return -1;
    677 	}
    678 
    679 	mdie = (struct rsn_mdie *) parse.mdie;
    680 	if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
    681 	    os_memcmp(mdie->mobility_domain, sm->mobility_domain,
    682 		      MOBILITY_DOMAIN_ID_LEN) != 0) {
    683 		wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
    684 		return -1;
    685 	}
    686 
    687 	ftie = (struct rsn_ftie *) parse.ftie;
    688 	if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
    689 		wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
    690 		return -1;
    691 	}
    692 
    693 	if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
    694 		wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
    695 		wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
    696 			    ftie->snonce, WPA_NONCE_LEN);
    697 		wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
    698 			    sm->snonce, WPA_NONCE_LEN);
    699 		return -1;
    700 	}
    701 
    702 	if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
    703 		wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
    704 		wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
    705 			    ftie->anonce, WPA_NONCE_LEN);
    706 		wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
    707 			    sm->anonce, WPA_NONCE_LEN);
    708 		return -1;
    709 	}
    710 
    711 	if (parse.r0kh_id == NULL) {
    712 		wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
    713 		return -1;
    714 	}
    715 
    716 	if (parse.r0kh_id_len != sm->r0kh_id_len ||
    717 	    os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
    718 		wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
    719 			   "the current R0KH-ID");
    720 		wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
    721 			    parse.r0kh_id, parse.r0kh_id_len);
    722 		wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
    723 			    sm->r0kh_id, sm->r0kh_id_len);
    724 		return -1;
    725 	}
    726 
    727 	if (parse.r1kh_id == NULL) {
    728 		wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
    729 		return -1;
    730 	}
    731 
    732 	if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
    733 		wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
    734 			   "ReassocResp");
    735 		return -1;
    736 	}
    737 
    738 	if (parse.rsn_pmkid == NULL ||
    739 	    os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
    740 		wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
    741 			   "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
    742 		return -1;
    743 	}
    744 
    745 	count = 3;
    746 	if (parse.ric)
    747 		count += ieee802_11_ie_count(parse.ric, parse.ric_len);
    748 	if (ftie->mic_control[1] != count) {
    749 		wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
    750 			   "Control: received %u expected %u",
    751 			   ftie->mic_control[1], count);
    752 		return -1;
    753 	}
    754 
    755 	if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
    756 		       parse.mdie - 2, parse.mdie_len + 2,
    757 		       parse.ftie - 2, parse.ftie_len + 2,
    758 		       parse.rsn - 2, parse.rsn_len + 2,
    759 		       parse.ric, parse.ric_len,
    760 		       mic) < 0) {
    761 		wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
    762 		return -1;
    763 	}
    764 
    765 	if (os_memcmp(mic, ftie->mic, 16) != 0) {
    766 		wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
    767 		wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
    768 		wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
    769 		return -1;
    770 	}
    771 
    772 	if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
    773 		return -1;
    774 
    775 #ifdef CONFIG_IEEE80211W
    776 	if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
    777 		return -1;
    778 #endif /* CONFIG_IEEE80211W */
    779 
    780 	if (sm->set_ptk_after_assoc) {
    781 		wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
    782 			   "are associated");
    783 		if (wpa_ft_install_ptk(sm, src_addr) < 0)
    784 			return -1;
    785 		sm->set_ptk_after_assoc = 0;
    786 	}
    787 
    788 	if (parse.ric) {
    789 		wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
    790 			    parse.ric, parse.ric_len);
    791 		/* TODO: parse response and inform driver about results when
    792 		 * using wpa_supplicant SME */
    793 	}
    794 
    795 	wpa_printf(MSG_DEBUG, "FT: Completed successfully");
    796 
    797 	return 0;
    798 }
    799 
    800 
    801 /**
    802  * wpa_ft_start_over_ds - Generate over-the-DS auth request
    803  * @sm: Pointer to WPA state machine data from wpa_sm_init()
    804  * @target_ap: Target AP Address
    805  * @mdie: Mobility Domain IE from the target AP
    806  * Returns: 0 on success, -1 on failure
    807  */
    808 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
    809 			 const u8 *mdie)
    810 {
    811 	u8 *ft_ies;
    812 	size_t ft_ies_len;
    813 
    814 	wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
    815 		   MAC2STR(target_ap));
    816 
    817 	/* Generate a new SNonce */
    818 	if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
    819 		wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
    820 		return -1;
    821 	}
    822 
    823 	ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
    824 				    NULL, target_ap, NULL, 0, mdie);
    825 	if (ft_ies) {
    826 		sm->over_the_ds_in_progress = 1;
    827 		os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
    828 		wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
    829 		os_free(ft_ies);
    830 	}
    831 
    832 	return 0;
    833 }
    834 
    835 #endif /* CONFIG_IEEE80211R */
    836