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