1 /* 2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/aes_wrap.h" 13 #include "crypto/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, struct wpa_ptk *ptk) 23 { 24 u8 ptk_name[WPA_PMK_NAME_LEN]; 25 const u8 *anonce = key->key_nonce; 26 27 if (sm->xxkey_len == 0) { 28 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 29 "derivation"); 30 return -1; 31 } 32 33 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid, 34 sm->ssid_len, sm->mobility_domain, 35 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr, 36 sm->pmk_r0, sm->pmk_r0_name); 37 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN); 38 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", 39 sm->pmk_r0_name, WPA_PMK_NAME_LEN); 40 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 41 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 42 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 43 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 44 WPA_PMK_NAME_LEN); 45 return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, 46 sm->bssid, sm->pmk_r1_name, ptk, ptk_name, 47 sm->key_mgmt, sm->pairwise_cipher); 48 } 49 50 51 /** 52 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters 53 * @sm: Pointer to WPA state machine data from wpa_sm_init() 54 * @ies: Association Response IEs or %NULL to clear FT parameters 55 * @ies_len: Length of ies buffer in octets 56 * Returns: 0 on success, -1 on failure 57 */ 58 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len) 59 { 60 struct wpa_ft_ies ft; 61 62 if (sm == NULL) 63 return 0; 64 65 if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0) 66 return -1; 67 68 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1) 69 return -1; 70 71 if (ft.mdie) { 72 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain", 73 ft.mdie, MOBILITY_DOMAIN_ID_LEN); 74 os_memcpy(sm->mobility_domain, ft.mdie, 75 MOBILITY_DOMAIN_ID_LEN); 76 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN]; 77 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x", 78 sm->mdie_ft_capab); 79 } else 80 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN); 81 82 if (ft.r0kh_id) { 83 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", 84 ft.r0kh_id, ft.r0kh_id_len); 85 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len); 86 sm->r0kh_id_len = ft.r0kh_id_len; 87 } else { 88 /* FIX: When should R0KH-ID be cleared? We need to keep the 89 * old R0KH-ID in order to be able to use this during FT. */ 90 /* 91 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN); 92 * sm->r0kh_id_len = 0; 93 */ 94 } 95 96 if (ft.r1kh_id) { 97 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", 98 ft.r1kh_id, FT_R1KH_ID_LEN); 99 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN); 100 } else 101 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN); 102 103 os_free(sm->assoc_resp_ies); 104 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2); 105 if (sm->assoc_resp_ies) { 106 u8 *pos = sm->assoc_resp_ies; 107 if (ft.mdie) { 108 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2); 109 pos += ft.mdie_len + 2; 110 } 111 if (ft.ftie) { 112 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2); 113 pos += ft.ftie_len + 2; 114 } 115 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies; 116 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from " 117 "(Re)Association Response", 118 sm->assoc_resp_ies, sm->assoc_resp_ies_len); 119 } 120 121 return 0; 122 } 123 124 125 /** 126 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request 127 * @sm: Pointer to WPA state machine data from wpa_sm_init() 128 * @len: Buffer for returning the length of the IEs 129 * @anonce: ANonce or %NULL if not yet available 130 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List 131 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used 132 * @kck_len: KCK length in octets 133 * @target_ap: Target AP address 134 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL 135 * @ric_ies_len: Length of ric_ies buffer in octets 136 * @ap_mdie: Mobility Domain IE from the target AP 137 * Returns: Pointer to buffer with IEs or %NULL on failure 138 * 139 * Caller is responsible for freeing the returned buffer with os_free(); 140 */ 141 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len, 142 const u8 *anonce, const u8 *pmk_name, 143 const u8 *kck, size_t kck_len, 144 const u8 *target_ap, 145 const u8 *ric_ies, size_t ric_ies_len, 146 const u8 *ap_mdie) 147 { 148 size_t buf_len; 149 u8 *buf, *pos, *ftie_len, *ftie_pos; 150 struct rsn_mdie *mdie; 151 struct rsn_ftie *ftie; 152 struct rsn_ie_hdr *rsnie; 153 u16 capab; 154 155 sm->ft_completed = 0; 156 sm->ft_reassoc_completed = 0; 157 158 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 159 2 + sm->r0kh_id_len + ric_ies_len + 100; 160 buf = os_zalloc(buf_len); 161 if (buf == NULL) 162 return NULL; 163 pos = buf; 164 165 /* RSNIE[PMKR0Name/PMKR1Name] */ 166 rsnie = (struct rsn_ie_hdr *) pos; 167 rsnie->elem_id = WLAN_EID_RSN; 168 WPA_PUT_LE16(rsnie->version, RSN_VERSION); 169 pos = (u8 *) (rsnie + 1); 170 171 /* Group Suite Selector */ 172 if (!wpa_cipher_valid_group(sm->group_cipher)) { 173 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", 174 sm->group_cipher); 175 os_free(buf); 176 return NULL; 177 } 178 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, 179 sm->group_cipher)); 180 pos += RSN_SELECTOR_LEN; 181 182 /* Pairwise Suite Count */ 183 WPA_PUT_LE16(pos, 1); 184 pos += 2; 185 186 /* Pairwise Suite List */ 187 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 188 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", 189 sm->pairwise_cipher); 190 os_free(buf); 191 return NULL; 192 } 193 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, 194 sm->pairwise_cipher)); 195 pos += RSN_SELECTOR_LEN; 196 197 /* Authenticated Key Management Suite Count */ 198 WPA_PUT_LE16(pos, 1); 199 pos += 2; 200 201 /* Authenticated Key Management Suite List */ 202 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) 203 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 204 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK) 205 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 206 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE) 207 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE); 208 else { 209 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", 210 sm->key_mgmt); 211 os_free(buf); 212 return NULL; 213 } 214 pos += RSN_SELECTOR_LEN; 215 216 /* RSN Capabilities */ 217 capab = 0; 218 #ifdef CONFIG_IEEE80211W 219 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) 220 capab |= WPA_CAPABILITY_MFPC; 221 #endif /* CONFIG_IEEE80211W */ 222 WPA_PUT_LE16(pos, capab); 223 pos += 2; 224 225 /* PMKID Count */ 226 WPA_PUT_LE16(pos, 1); 227 pos += 2; 228 229 /* PMKID List [PMKR0Name/PMKR1Name] */ 230 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); 231 pos += WPA_PMK_NAME_LEN; 232 233 #ifdef CONFIG_IEEE80211W 234 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 235 /* Management Group Cipher Suite */ 236 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 237 pos += RSN_SELECTOR_LEN; 238 } 239 #endif /* CONFIG_IEEE80211W */ 240 241 rsnie->len = (pos - (u8 *) rsnie) - 2; 242 243 /* MDIE */ 244 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 245 *pos++ = sizeof(*mdie); 246 mdie = (struct rsn_mdie *) pos; 247 pos += sizeof(*mdie); 248 os_memcpy(mdie->mobility_domain, sm->mobility_domain, 249 MOBILITY_DOMAIN_ID_LEN); 250 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : 251 sm->mdie_ft_capab; 252 253 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ 254 ftie_pos = pos; 255 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 256 ftie_len = pos++; 257 ftie = (struct rsn_ftie *) pos; 258 pos += sizeof(*ftie); 259 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); 260 if (anonce) 261 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); 262 if (kck) { 263 /* R1KH-ID sub-element in third FT message */ 264 *pos++ = FTIE_SUBELEM_R1KH_ID; 265 *pos++ = FT_R1KH_ID_LEN; 266 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); 267 pos += FT_R1KH_ID_LEN; 268 } 269 /* R0KH-ID sub-element */ 270 *pos++ = FTIE_SUBELEM_R0KH_ID; 271 *pos++ = sm->r0kh_id_len; 272 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); 273 pos += sm->r0kh_id_len; 274 *ftie_len = pos - ftie_len - 1; 275 276 if (ric_ies) { 277 /* RIC Request */ 278 os_memcpy(pos, ric_ies, ric_ies_len); 279 pos += ric_ies_len; 280 } 281 282 if (kck) { 283 /* 284 * IEEE Std 802.11r-2008, 11A.8.4 285 * MIC shall be calculated over: 286 * non-AP STA MAC address 287 * Target AP MAC address 288 * Transaction seq number (5 for ReassocReq, 3 otherwise) 289 * RSN IE 290 * MDIE 291 * FTIE (with MIC field set to 0) 292 * RIC-Request (if present) 293 */ 294 /* Information element count */ 295 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, 296 ric_ies_len); 297 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5, 298 ((u8 *) mdie) - 2, 2 + sizeof(*mdie), 299 ftie_pos, 2 + *ftie_len, 300 (u8 *) rsnie, 2 + rsnie->len, ric_ies, 301 ric_ies_len, ftie->mic) < 0) { 302 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); 303 os_free(buf); 304 return NULL; 305 } 306 } 307 308 *len = pos - buf; 309 310 return buf; 311 } 312 313 314 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) 315 { 316 int keylen; 317 enum wpa_alg alg; 318 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; 319 320 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); 321 322 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 323 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", 324 sm->pairwise_cipher); 325 return -1; 326 } 327 328 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 329 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 330 331 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, 332 sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) { 333 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); 334 return -1; 335 } 336 337 return 0; 338 } 339 340 341 /** 342 * wpa_ft_prepare_auth_request - Generate over-the-air auth request 343 * @sm: Pointer to WPA state machine data from wpa_sm_init() 344 * @mdie: Target AP MDIE 345 * Returns: 0 on success, -1 on failure 346 */ 347 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) 348 { 349 u8 *ft_ies; 350 size_t ft_ies_len; 351 352 /* Generate a new SNonce */ 353 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 354 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 355 return -1; 356 } 357 358 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 359 NULL, 0, sm->bssid, NULL, 0, mdie); 360 if (ft_ies) { 361 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 362 ft_ies, ft_ies_len); 363 os_free(ft_ies); 364 } 365 366 return 0; 367 } 368 369 370 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, 371 int ft_action, const u8 *target_ap, 372 const u8 *ric_ies, size_t ric_ies_len) 373 { 374 u8 *ft_ies; 375 size_t ft_ies_len; 376 struct wpa_ft_ies parse; 377 struct rsn_mdie *mdie; 378 struct rsn_ftie *ftie; 379 u8 ptk_name[WPA_PMK_NAME_LEN]; 380 int ret; 381 const u8 *bssid; 382 383 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 384 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); 385 386 if (ft_action) { 387 if (!sm->over_the_ds_in_progress) { 388 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 389 "- drop FT Action Response"); 390 return -1; 391 } 392 393 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { 394 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 395 "with this Target AP - drop FT Action " 396 "Response"); 397 return -1; 398 } 399 } 400 401 if (!wpa_key_mgmt_ft(sm->key_mgmt)) { 402 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 403 "enabled for this connection"); 404 return -1; 405 } 406 407 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 408 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 409 return -1; 410 } 411 412 mdie = (struct rsn_mdie *) parse.mdie; 413 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 414 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 415 MOBILITY_DOMAIN_ID_LEN) != 0) { 416 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 417 return -1; 418 } 419 420 ftie = (struct rsn_ftie *) parse.ftie; 421 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 422 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 423 return -1; 424 } 425 426 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 427 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 428 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 429 ftie->snonce, WPA_NONCE_LEN); 430 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 431 sm->snonce, WPA_NONCE_LEN); 432 return -1; 433 } 434 435 if (parse.r0kh_id == NULL) { 436 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 437 return -1; 438 } 439 440 if (parse.r0kh_id_len != sm->r0kh_id_len || 441 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 442 { 443 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 444 "the current R0KH-ID"); 445 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 446 parse.r0kh_id, parse.r0kh_id_len); 447 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 448 sm->r0kh_id, sm->r0kh_id_len); 449 return -1; 450 } 451 452 if (parse.r1kh_id == NULL) { 453 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 454 return -1; 455 } 456 457 if (parse.rsn_pmkid == NULL || 458 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) 459 { 460 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " 461 "RSNIE"); 462 return -1; 463 } 464 465 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 466 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); 467 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); 468 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); 469 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); 470 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 471 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 472 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 473 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", 474 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 475 476 bssid = target_ap; 477 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, 478 sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk, 479 ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0) 480 return -1; 481 482 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, 483 sm->pmk_r1_name, 484 sm->ptk.kck, sm->ptk.kck_len, bssid, 485 ric_ies, ric_ies_len, 486 parse.mdie ? parse.mdie - 2 : NULL); 487 if (ft_ies) { 488 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 489 ft_ies, ft_ies_len); 490 os_free(ft_ies); 491 } 492 493 wpa_sm_mark_authenticated(sm, bssid); 494 ret = wpa_ft_install_ptk(sm, bssid); 495 if (ret) { 496 /* 497 * Some drivers do not support key configuration when we are 498 * not associated with the target AP. Work around this by 499 * trying again after the following reassociation gets 500 * completed. 501 */ 502 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " 503 "association - try again after reassociation"); 504 sm->set_ptk_after_assoc = 1; 505 } else 506 sm->set_ptk_after_assoc = 0; 507 508 sm->ft_completed = 1; 509 if (ft_action) { 510 /* 511 * The caller is expected trigger re-association with the 512 * Target AP. 513 */ 514 os_memcpy(sm->bssid, target_ap, ETH_ALEN); 515 } 516 517 return 0; 518 } 519 520 521 int wpa_ft_is_completed(struct wpa_sm *sm) 522 { 523 if (sm == NULL) 524 return 0; 525 526 if (!wpa_key_mgmt_ft(sm->key_mgmt)) 527 return 0; 528 529 return sm->ft_completed; 530 } 531 532 533 void wpa_reset_ft_completed(struct wpa_sm *sm) 534 { 535 if (sm != NULL) 536 sm->ft_completed = 0; 537 } 538 539 540 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem, 541 size_t gtk_elem_len) 542 { 543 u8 gtk[32]; 544 int keyidx; 545 enum wpa_alg alg; 546 size_t gtk_len, keylen, rsc_len; 547 548 if (gtk_elem == NULL) { 549 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE"); 550 return 0; 551 } 552 553 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp", 554 gtk_elem, gtk_elem_len); 555 556 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 || 557 gtk_elem_len - 19 > sizeof(gtk)) { 558 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " 559 "length %lu", (unsigned long) gtk_elem_len); 560 return -1; 561 } 562 gtk_len = gtk_elem_len - 19; 563 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11, 564 gtk)) { 565 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 566 "decrypt GTK"); 567 return -1; 568 } 569 570 keylen = wpa_cipher_key_len(sm->group_cipher); 571 rsc_len = wpa_cipher_rsc_len(sm->group_cipher); 572 alg = wpa_cipher_to_alg(sm->group_cipher); 573 if (alg == WPA_ALG_NONE) { 574 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", 575 sm->group_cipher); 576 return -1; 577 } 578 579 if (gtk_len < keylen) { 580 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); 581 return -1; 582 } 583 584 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ 585 586 keyidx = WPA_GET_LE16(gtk_elem) & 0x03; 587 588 if (gtk_elem[2] != keylen) { 589 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " 590 "negotiated %lu", 591 gtk_elem[2], (unsigned long) keylen); 592 return -1; 593 } 594 595 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); 596 if (sm->group_cipher == WPA_CIPHER_TKIP) { 597 /* Swap Tx/Rx keys for Michael MIC */ 598 u8 tmp[8]; 599 os_memcpy(tmp, gtk + 16, 8); 600 os_memcpy(gtk + 16, gtk + 24, 8); 601 os_memcpy(gtk + 24, tmp, 8); 602 } 603 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, 604 gtk_elem + 3, rsc_len, gtk, keylen) < 0) { 605 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " 606 "driver."); 607 return -1; 608 } 609 610 return 0; 611 } 612 613 614 #ifdef CONFIG_IEEE80211W 615 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, 616 size_t igtk_elem_len) 617 { 618 u8 igtk[WPA_IGTK_LEN]; 619 u16 keyidx; 620 621 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 622 return 0; 623 624 if (igtk_elem == NULL) { 625 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); 626 return 0; 627 } 628 629 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", 630 igtk_elem, igtk_elem_len); 631 632 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { 633 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " 634 "length %lu", (unsigned long) igtk_elem_len); 635 return -1; 636 } 637 if (igtk_elem[8] != WPA_IGTK_LEN) { 638 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " 639 "%d", igtk_elem[8]); 640 return -1; 641 } 642 643 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8, 644 igtk_elem + 9, igtk)) { 645 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 646 "decrypt IGTK"); 647 return -1; 648 } 649 650 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ 651 652 keyidx = WPA_GET_LE16(igtk_elem); 653 654 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, 655 WPA_IGTK_LEN); 656 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, 657 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { 658 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " 659 "driver."); 660 return -1; 661 } 662 663 return 0; 664 } 665 #endif /* CONFIG_IEEE80211W */ 666 667 668 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, 669 size_t ies_len, const u8 *src_addr) 670 { 671 struct wpa_ft_ies parse; 672 struct rsn_mdie *mdie; 673 struct rsn_ftie *ftie; 674 unsigned int count; 675 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 676 677 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 678 679 if (!wpa_key_mgmt_ft(sm->key_mgmt)) { 680 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 681 "enabled for this connection"); 682 return -1; 683 } 684 685 if (sm->ft_reassoc_completed) { 686 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission"); 687 return 0; 688 } 689 690 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 691 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 692 return -1; 693 } 694 695 mdie = (struct rsn_mdie *) parse.mdie; 696 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 697 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 698 MOBILITY_DOMAIN_ID_LEN) != 0) { 699 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 700 return -1; 701 } 702 703 ftie = (struct rsn_ftie *) parse.ftie; 704 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 705 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 706 return -1; 707 } 708 709 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 710 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 711 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 712 ftie->snonce, WPA_NONCE_LEN); 713 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 714 sm->snonce, WPA_NONCE_LEN); 715 return -1; 716 } 717 718 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { 719 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 720 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 721 ftie->anonce, WPA_NONCE_LEN); 722 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 723 sm->anonce, WPA_NONCE_LEN); 724 return -1; 725 } 726 727 if (parse.r0kh_id == NULL) { 728 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 729 return -1; 730 } 731 732 if (parse.r0kh_id_len != sm->r0kh_id_len || 733 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 734 { 735 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 736 "the current R0KH-ID"); 737 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 738 parse.r0kh_id, parse.r0kh_id_len); 739 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 740 sm->r0kh_id, sm->r0kh_id_len); 741 return -1; 742 } 743 744 if (parse.r1kh_id == NULL) { 745 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 746 return -1; 747 } 748 749 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { 750 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 751 "ReassocResp"); 752 return -1; 753 } 754 755 if (parse.rsn_pmkid == NULL || 756 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 757 { 758 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 759 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 760 return -1; 761 } 762 763 count = 3; 764 if (parse.ric) 765 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 766 if (ftie->mic_control[1] != count) { 767 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 768 "Control: received %u expected %u", 769 ftie->mic_control[1], count); 770 return -1; 771 } 772 773 if (wpa_ft_mic(sm->ptk.kck, sm->ptk.kck_len, sm->own_addr, src_addr, 6, 774 parse.mdie - 2, parse.mdie_len + 2, 775 parse.ftie - 2, parse.ftie_len + 2, 776 parse.rsn - 2, parse.rsn_len + 2, 777 parse.ric, parse.ric_len, 778 mic) < 0) { 779 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 780 return -1; 781 } 782 783 if (os_memcmp_const(mic, ftie->mic, 16) != 0) { 784 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 785 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 786 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 787 return -1; 788 } 789 790 sm->ft_reassoc_completed = 1; 791 792 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) 793 return -1; 794 795 #ifdef CONFIG_IEEE80211W 796 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) 797 return -1; 798 #endif /* CONFIG_IEEE80211W */ 799 800 if (sm->set_ptk_after_assoc) { 801 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " 802 "are associated"); 803 if (wpa_ft_install_ptk(sm, src_addr) < 0) 804 return -1; 805 sm->set_ptk_after_assoc = 0; 806 } 807 808 if (parse.ric) { 809 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", 810 parse.ric, parse.ric_len); 811 /* TODO: parse response and inform driver about results when 812 * using wpa_supplicant SME */ 813 } 814 815 wpa_printf(MSG_DEBUG, "FT: Completed successfully"); 816 817 return 0; 818 } 819 820 821 /** 822 * wpa_ft_start_over_ds - Generate over-the-DS auth request 823 * @sm: Pointer to WPA state machine data from wpa_sm_init() 824 * @target_ap: Target AP Address 825 * @mdie: Mobility Domain IE from the target AP 826 * Returns: 0 on success, -1 on failure 827 */ 828 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, 829 const u8 *mdie) 830 { 831 u8 *ft_ies; 832 size_t ft_ies_len; 833 834 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, 835 MAC2STR(target_ap)); 836 837 /* Generate a new SNonce */ 838 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 839 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 840 return -1; 841 } 842 843 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 844 NULL, 0, target_ap, NULL, 0, mdie); 845 if (ft_ies) { 846 sm->over_the_ds_in_progress = 1; 847 os_memcpy(sm->target_ap, target_ap, ETH_ALEN); 848 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); 849 os_free(ft_ies); 850 } 851 852 return 0; 853 } 854 855 #endif /* CONFIG_IEEE80211R */ 856