1 /* 2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2006-2015, 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, 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 #ifdef CONFIG_FILS 209 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256) 210 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256); 211 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384) 212 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384); 213 #endif /* CONFIG_FILS */ 214 else { 215 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", 216 sm->key_mgmt); 217 os_free(buf); 218 return NULL; 219 } 220 pos += RSN_SELECTOR_LEN; 221 222 /* RSN Capabilities */ 223 capab = 0; 224 #ifdef CONFIG_IEEE80211W 225 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) 226 capab |= WPA_CAPABILITY_MFPC; 227 #endif /* CONFIG_IEEE80211W */ 228 WPA_PUT_LE16(pos, capab); 229 pos += 2; 230 231 /* PMKID Count */ 232 WPA_PUT_LE16(pos, 1); 233 pos += 2; 234 235 /* PMKID List [PMKR0Name/PMKR1Name] */ 236 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); 237 pos += WPA_PMK_NAME_LEN; 238 239 #ifdef CONFIG_IEEE80211W 240 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 241 /* Management Group Cipher Suite */ 242 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 243 pos += RSN_SELECTOR_LEN; 244 } 245 #endif /* CONFIG_IEEE80211W */ 246 247 rsnie->len = (pos - (u8 *) rsnie) - 2; 248 249 /* MDIE */ 250 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 251 *pos++ = sizeof(*mdie); 252 mdie = (struct rsn_mdie *) pos; 253 pos += sizeof(*mdie); 254 os_memcpy(mdie->mobility_domain, sm->mobility_domain, 255 MOBILITY_DOMAIN_ID_LEN); 256 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : 257 sm->mdie_ft_capab; 258 259 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ 260 ftie_pos = pos; 261 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 262 ftie_len = pos++; 263 ftie = (struct rsn_ftie *) pos; 264 pos += sizeof(*ftie); 265 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); 266 if (anonce) 267 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); 268 if (kck) { 269 /* R1KH-ID sub-element in third FT message */ 270 *pos++ = FTIE_SUBELEM_R1KH_ID; 271 *pos++ = FT_R1KH_ID_LEN; 272 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); 273 pos += FT_R1KH_ID_LEN; 274 } 275 /* R0KH-ID sub-element */ 276 *pos++ = FTIE_SUBELEM_R0KH_ID; 277 *pos++ = sm->r0kh_id_len; 278 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); 279 pos += sm->r0kh_id_len; 280 *ftie_len = pos - ftie_len - 1; 281 282 if (ric_ies) { 283 /* RIC Request */ 284 os_memcpy(pos, ric_ies, ric_ies_len); 285 pos += ric_ies_len; 286 } 287 288 if (kck) { 289 /* 290 * IEEE Std 802.11r-2008, 11A.8.4 291 * MIC shall be calculated over: 292 * non-AP STA MAC address 293 * Target AP MAC address 294 * Transaction seq number (5 for ReassocReq, 3 otherwise) 295 * RSN IE 296 * MDIE 297 * FTIE (with MIC field set to 0) 298 * RIC-Request (if present) 299 */ 300 /* Information element count */ 301 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, 302 ric_ies_len); 303 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5, 304 ((u8 *) mdie) - 2, 2 + sizeof(*mdie), 305 ftie_pos, 2 + *ftie_len, 306 (u8 *) rsnie, 2 + rsnie->len, ric_ies, 307 ric_ies_len, ftie->mic) < 0) { 308 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); 309 os_free(buf); 310 return NULL; 311 } 312 } 313 314 *len = pos - buf; 315 316 return buf; 317 } 318 319 320 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) 321 { 322 int keylen; 323 enum wpa_alg alg; 324 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; 325 326 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); 327 328 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 329 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", 330 sm->pairwise_cipher); 331 return -1; 332 } 333 334 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 335 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 336 337 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, 338 sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) { 339 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); 340 return -1; 341 } 342 343 return 0; 344 } 345 346 347 /** 348 * wpa_ft_prepare_auth_request - Generate over-the-air auth request 349 * @sm: Pointer to WPA state machine data from wpa_sm_init() 350 * @mdie: Target AP MDIE 351 * Returns: 0 on success, -1 on failure 352 */ 353 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) 354 { 355 u8 *ft_ies; 356 size_t ft_ies_len; 357 358 /* Generate a new SNonce */ 359 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 360 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 361 return -1; 362 } 363 364 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 365 NULL, 0, sm->bssid, NULL, 0, mdie); 366 if (ft_ies) { 367 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 368 ft_ies, ft_ies_len); 369 os_free(ft_ies); 370 } 371 372 return 0; 373 } 374 375 376 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, 377 int ft_action, const u8 *target_ap, 378 const u8 *ric_ies, size_t ric_ies_len) 379 { 380 u8 *ft_ies; 381 size_t ft_ies_len; 382 struct wpa_ft_ies parse; 383 struct rsn_mdie *mdie; 384 struct rsn_ftie *ftie; 385 u8 ptk_name[WPA_PMK_NAME_LEN]; 386 int ret; 387 const u8 *bssid; 388 389 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 390 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); 391 392 if (ft_action) { 393 if (!sm->over_the_ds_in_progress) { 394 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 395 "- drop FT Action Response"); 396 return -1; 397 } 398 399 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { 400 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 401 "with this Target AP - drop FT Action " 402 "Response"); 403 return -1; 404 } 405 } 406 407 if (!wpa_key_mgmt_ft(sm->key_mgmt)) { 408 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 409 "enabled for this connection"); 410 return -1; 411 } 412 413 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 414 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 415 return -1; 416 } 417 418 mdie = (struct rsn_mdie *) parse.mdie; 419 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 420 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 421 MOBILITY_DOMAIN_ID_LEN) != 0) { 422 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 423 return -1; 424 } 425 426 ftie = (struct rsn_ftie *) parse.ftie; 427 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 428 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 429 return -1; 430 } 431 432 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 433 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 434 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 435 ftie->snonce, WPA_NONCE_LEN); 436 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 437 sm->snonce, WPA_NONCE_LEN); 438 return -1; 439 } 440 441 if (parse.r0kh_id == NULL) { 442 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 443 return -1; 444 } 445 446 if (parse.r0kh_id_len != sm->r0kh_id_len || 447 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 448 { 449 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 450 "the current R0KH-ID"); 451 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 452 parse.r0kh_id, parse.r0kh_id_len); 453 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 454 sm->r0kh_id, sm->r0kh_id_len); 455 return -1; 456 } 457 458 if (parse.r1kh_id == NULL) { 459 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 460 return -1; 461 } 462 463 if (parse.rsn_pmkid == NULL || 464 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) 465 { 466 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " 467 "RSNIE"); 468 return -1; 469 } 470 471 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 472 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); 473 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); 474 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); 475 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); 476 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 477 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 478 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 479 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", 480 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 481 482 bssid = target_ap; 483 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, 484 sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk, 485 ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0) 486 return -1; 487 488 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, 489 sm->pmk_r1_name, 490 sm->ptk.kck, sm->ptk.kck_len, 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, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11, 570 gtk)) { 571 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 572 "decrypt GTK"); 573 return -1; 574 } 575 576 keylen = wpa_cipher_key_len(sm->group_cipher); 577 rsc_len = wpa_cipher_rsc_len(sm->group_cipher); 578 alg = wpa_cipher_to_alg(sm->group_cipher); 579 if (alg == WPA_ALG_NONE) { 580 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", 581 sm->group_cipher); 582 return -1; 583 } 584 585 if (gtk_len < keylen) { 586 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); 587 return -1; 588 } 589 590 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ 591 592 keyidx = WPA_GET_LE16(gtk_elem) & 0x03; 593 594 if (gtk_elem[2] != keylen) { 595 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " 596 "negotiated %lu", 597 gtk_elem[2], (unsigned long) keylen); 598 return -1; 599 } 600 601 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); 602 if (sm->group_cipher == WPA_CIPHER_TKIP) { 603 /* Swap Tx/Rx keys for Michael MIC */ 604 u8 tmp[8]; 605 os_memcpy(tmp, gtk + 16, 8); 606 os_memcpy(gtk + 16, gtk + 24, 8); 607 os_memcpy(gtk + 24, tmp, 8); 608 } 609 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, 610 gtk_elem + 3, rsc_len, gtk, keylen) < 0) { 611 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " 612 "driver."); 613 return -1; 614 } 615 616 return 0; 617 } 618 619 620 #ifdef CONFIG_IEEE80211W 621 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, 622 size_t igtk_elem_len) 623 { 624 u8 igtk[WPA_IGTK_LEN]; 625 u16 keyidx; 626 627 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 628 return 0; 629 630 if (igtk_elem == NULL) { 631 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); 632 return 0; 633 } 634 635 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", 636 igtk_elem, igtk_elem_len); 637 638 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { 639 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " 640 "length %lu", (unsigned long) igtk_elem_len); 641 return -1; 642 } 643 if (igtk_elem[8] != WPA_IGTK_LEN) { 644 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " 645 "%d", igtk_elem[8]); 646 return -1; 647 } 648 649 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8, 650 igtk_elem + 9, igtk)) { 651 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 652 "decrypt IGTK"); 653 return -1; 654 } 655 656 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ 657 658 keyidx = WPA_GET_LE16(igtk_elem); 659 660 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, 661 WPA_IGTK_LEN); 662 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, 663 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { 664 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " 665 "driver."); 666 return -1; 667 } 668 669 return 0; 670 } 671 #endif /* CONFIG_IEEE80211W */ 672 673 674 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, 675 size_t ies_len, const u8 *src_addr) 676 { 677 struct wpa_ft_ies parse; 678 struct rsn_mdie *mdie; 679 struct rsn_ftie *ftie; 680 unsigned int count; 681 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 682 683 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 684 685 if (!wpa_key_mgmt_ft(sm->key_mgmt)) { 686 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 687 "enabled for this connection"); 688 return -1; 689 } 690 691 if (sm->ft_reassoc_completed) { 692 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission"); 693 return 0; 694 } 695 696 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 697 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 698 return -1; 699 } 700 701 mdie = (struct rsn_mdie *) parse.mdie; 702 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 703 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 704 MOBILITY_DOMAIN_ID_LEN) != 0) { 705 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 706 return -1; 707 } 708 709 ftie = (struct rsn_ftie *) parse.ftie; 710 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 711 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 712 return -1; 713 } 714 715 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 716 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 717 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 718 ftie->snonce, WPA_NONCE_LEN); 719 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 720 sm->snonce, WPA_NONCE_LEN); 721 return -1; 722 } 723 724 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { 725 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 726 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 727 ftie->anonce, WPA_NONCE_LEN); 728 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 729 sm->anonce, WPA_NONCE_LEN); 730 return -1; 731 } 732 733 if (parse.r0kh_id == NULL) { 734 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 735 return -1; 736 } 737 738 if (parse.r0kh_id_len != sm->r0kh_id_len || 739 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 740 { 741 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 742 "the current R0KH-ID"); 743 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 744 parse.r0kh_id, parse.r0kh_id_len); 745 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 746 sm->r0kh_id, sm->r0kh_id_len); 747 return -1; 748 } 749 750 if (parse.r1kh_id == NULL) { 751 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 752 return -1; 753 } 754 755 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { 756 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 757 "ReassocResp"); 758 return -1; 759 } 760 761 if (parse.rsn_pmkid == NULL || 762 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 763 { 764 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 765 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 766 return -1; 767 } 768 769 count = 3; 770 if (parse.ric) 771 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 772 if (ftie->mic_control[1] != count) { 773 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 774 "Control: received %u expected %u", 775 ftie->mic_control[1], count); 776 return -1; 777 } 778 779 if (wpa_ft_mic(sm->ptk.kck, sm->ptk.kck_len, sm->own_addr, src_addr, 6, 780 parse.mdie - 2, parse.mdie_len + 2, 781 parse.ftie - 2, parse.ftie_len + 2, 782 parse.rsn - 2, parse.rsn_len + 2, 783 parse.ric, parse.ric_len, 784 mic) < 0) { 785 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 786 return -1; 787 } 788 789 if (os_memcmp_const(mic, ftie->mic, 16) != 0) { 790 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 791 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 792 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 793 return -1; 794 } 795 796 sm->ft_reassoc_completed = 1; 797 798 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) 799 return -1; 800 801 #ifdef CONFIG_IEEE80211W 802 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) 803 return -1; 804 #endif /* CONFIG_IEEE80211W */ 805 806 if (sm->set_ptk_after_assoc) { 807 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " 808 "are associated"); 809 if (wpa_ft_install_ptk(sm, src_addr) < 0) 810 return -1; 811 sm->set_ptk_after_assoc = 0; 812 } 813 814 if (parse.ric) { 815 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", 816 parse.ric, parse.ric_len); 817 /* TODO: parse response and inform driver about results when 818 * using wpa_supplicant SME */ 819 } 820 821 wpa_printf(MSG_DEBUG, "FT: Completed successfully"); 822 823 return 0; 824 } 825 826 827 /** 828 * wpa_ft_start_over_ds - Generate over-the-DS auth request 829 * @sm: Pointer to WPA state machine data from wpa_sm_init() 830 * @target_ap: Target AP Address 831 * @mdie: Mobility Domain IE from the target AP 832 * Returns: 0 on success, -1 on failure 833 */ 834 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, 835 const u8 *mdie) 836 { 837 u8 *ft_ies; 838 size_t ft_ies_len; 839 840 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, 841 MAC2STR(target_ap)); 842 843 /* Generate a new SNonce */ 844 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 845 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 846 return -1; 847 } 848 849 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 850 NULL, 0, target_ap, NULL, 0, mdie); 851 if (ft_ies) { 852 sm->over_the_ds_in_progress = 1; 853 os_memcpy(sm->target_ap, target_ap, ETH_ALEN); 854 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); 855 os_free(ft_ies); 856 } 857 858 return 0; 859 } 860 861 #endif /* CONFIG_IEEE80211R */ 862
