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