wpa_ft.c revision c5ec7f57ead87efa365800228aa0b09a12d9e6c4
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 21int 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 */ 63int 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 */ 145static 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 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 176 else if (sm->group_cipher == WPA_CIPHER_TKIP) 177 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 178 else { 179 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", 180 sm->group_cipher); 181 os_free(buf); 182 return NULL; 183 } 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 (sm->pairwise_cipher == WPA_CIPHER_CCMP) 192 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 193 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP) 194 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 195 else { 196 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", 197 sm->pairwise_cipher); 198 os_free(buf); 199 return NULL; 200 } 201 pos += RSN_SELECTOR_LEN; 202 203 /* Authenticated Key Management Suite Count */ 204 WPA_PUT_LE16(pos, 1); 205 pos += 2; 206 207 /* Authenticated Key Management Suite List */ 208 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) 209 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 210 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK) 211 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 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 318static 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 switch (sm->pairwise_cipher) { 327 case WPA_CIPHER_CCMP: 328 alg = WPA_ALG_CCMP; 329 keylen = 16; 330 break; 331 case WPA_CIPHER_TKIP: 332 alg = WPA_ALG_TKIP; 333 keylen = 32; 334 break; 335 default: 336 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", 337 sm->pairwise_cipher); 338 return -1; 339 } 340 341 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, 342 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) { 343 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); 344 return -1; 345 } 346 347 return 0; 348} 349 350 351/** 352 * wpa_ft_prepare_auth_request - Generate over-the-air auth request 353 * @sm: Pointer to WPA state machine data from wpa_sm_init() 354 * @mdie: Target AP MDIE 355 * Returns: 0 on success, -1 on failure 356 */ 357int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) 358{ 359 u8 *ft_ies; 360 size_t ft_ies_len; 361 362 /* Generate a new SNonce */ 363 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 364 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 365 return -1; 366 } 367 368 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 369 NULL, sm->bssid, NULL, 0, mdie); 370 if (ft_ies) { 371 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 372 ft_ies, ft_ies_len); 373 os_free(ft_ies); 374 } 375 376 return 0; 377} 378 379 380int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, 381 int ft_action, const u8 *target_ap, 382 const u8 *ric_ies, size_t ric_ies_len) 383{ 384 u8 *ft_ies; 385 size_t ft_ies_len, ptk_len; 386 struct wpa_ft_ies parse; 387 struct rsn_mdie *mdie; 388 struct rsn_ftie *ftie; 389 u8 ptk_name[WPA_PMK_NAME_LEN]; 390 int ret; 391 const u8 *bssid; 392 393 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 394 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); 395 396 if (ft_action) { 397 if (!sm->over_the_ds_in_progress) { 398 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 399 "- drop FT Action Response"); 400 return -1; 401 } 402 403 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { 404 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 405 "with this Target AP - drop FT Action " 406 "Response"); 407 return -1; 408 } 409 } 410 411 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 412 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 413 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 414 "enabled for this connection"); 415 return -1; 416 } 417 418 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 419 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 420 return -1; 421 } 422 423 mdie = (struct rsn_mdie *) parse.mdie; 424 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 425 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 426 MOBILITY_DOMAIN_ID_LEN) != 0) { 427 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 428 return -1; 429 } 430 431 ftie = (struct rsn_ftie *) parse.ftie; 432 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 433 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 434 return -1; 435 } 436 437 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 438 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 439 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 440 ftie->snonce, WPA_NONCE_LEN); 441 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 442 sm->snonce, WPA_NONCE_LEN); 443 return -1; 444 } 445 446 if (parse.r0kh_id == NULL) { 447 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 448 return -1; 449 } 450 451 if (parse.r0kh_id_len != sm->r0kh_id_len || 452 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 453 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 454 "the current R0KH-ID"); 455 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 456 parse.r0kh_id, parse.r0kh_id_len); 457 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 458 sm->r0kh_id, sm->r0kh_id_len); 459 return -1; 460 } 461 462 if (parse.r1kh_id == NULL) { 463 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 464 return -1; 465 } 466 467 if (parse.rsn_pmkid == NULL || 468 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) { 469 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " 470 "RSNIE"); 471 return -1; 472 } 473 474 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 475 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); 476 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); 477 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); 478 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); 479 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 480 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 481 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 482 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", 483 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 484 485 bssid = target_ap; 486 ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64; 487 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr, 488 bssid, sm->pmk_r1_name, 489 (u8 *) &sm->ptk, ptk_len, ptk_name); 490 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 491 (u8 *) &sm->ptk, ptk_len); 492 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 493 494 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, 495 sm->pmk_r1_name, sm->ptk.kck, bssid, 496 ric_ies, ric_ies_len, 497 parse.mdie ? parse.mdie - 2 : NULL); 498 if (ft_ies) { 499 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 500 ft_ies, ft_ies_len); 501 os_free(ft_ies); 502 } 503 504 wpa_sm_mark_authenticated(sm, bssid); 505 ret = wpa_ft_install_ptk(sm, bssid); 506 if (ret) { 507 /* 508 * Some drivers do not support key configuration when we are 509 * not associated with the target AP. Work around this by 510 * trying again after the following reassociation gets 511 * completed. 512 */ 513 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " 514 "association - try again after reassociation"); 515 sm->set_ptk_after_assoc = 1; 516 } else 517 sm->set_ptk_after_assoc = 0; 518 519 sm->ft_completed = 1; 520 if (ft_action) { 521 /* 522 * The caller is expected trigger re-association with the 523 * Target AP. 524 */ 525 os_memcpy(sm->bssid, target_ap, ETH_ALEN); 526 } 527 528 return 0; 529} 530 531 532int wpa_ft_is_completed(struct wpa_sm *sm) 533{ 534 if (sm == NULL) 535 return 0; 536 537 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 538 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) 539 return 0; 540 541 return sm->ft_completed; 542} 543 544 545static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem, 546 size_t gtk_elem_len) 547{ 548 u8 gtk[32]; 549 int keyidx; 550 enum wpa_alg alg; 551 size_t gtk_len, keylen, rsc_len; 552 553 if (gtk_elem == NULL) { 554 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE"); 555 return 0; 556 } 557 558 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp", 559 gtk_elem, gtk_elem_len); 560 561 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 || 562 gtk_elem_len - 19 > sizeof(gtk)) { 563 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " 564 "length %lu", (unsigned long) gtk_elem_len); 565 return -1; 566 } 567 gtk_len = gtk_elem_len - 19; 568 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) { 569 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 570 "decrypt GTK"); 571 return -1; 572 } 573 574 switch (sm->group_cipher) { 575 case WPA_CIPHER_CCMP: 576 keylen = 16; 577 rsc_len = 6; 578 alg = WPA_ALG_CCMP; 579 break; 580 case WPA_CIPHER_TKIP: 581 keylen = 32; 582 rsc_len = 6; 583 alg = WPA_ALG_TKIP; 584 break; 585 case WPA_CIPHER_WEP104: 586 keylen = 13; 587 rsc_len = 0; 588 alg = WPA_ALG_WEP; 589 break; 590 case WPA_CIPHER_WEP40: 591 keylen = 5; 592 rsc_len = 0; 593 alg = WPA_ALG_WEP; 594 break; 595 default: 596 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", 597 sm->group_cipher); 598 return -1; 599 } 600 601 if (gtk_len < keylen) { 602 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); 603 return -1; 604 } 605 606 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ 607 608 keyidx = WPA_GET_LE16(gtk_elem) & 0x03; 609 610 if (gtk_elem[2] != keylen) { 611 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " 612 "negotiated %lu", 613 gtk_elem[2], (unsigned long) keylen); 614 return -1; 615 } 616 617 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); 618 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, 619 gtk_elem + 3, rsc_len, gtk, keylen) < 0) { 620 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " 621 "driver."); 622 return -1; 623 } 624 625 return 0; 626} 627 628 629#ifdef CONFIG_IEEE80211W 630static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, 631 size_t igtk_elem_len) 632{ 633 u8 igtk[WPA_IGTK_LEN]; 634 u16 keyidx; 635 636 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 637 return 0; 638 639 if (igtk_elem == NULL) { 640 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); 641 return 0; 642 } 643 644 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", 645 igtk_elem, igtk_elem_len); 646 647 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { 648 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " 649 "length %lu", (unsigned long) igtk_elem_len); 650 return -1; 651 } 652 if (igtk_elem[8] != WPA_IGTK_LEN) { 653 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " 654 "%d", igtk_elem[8]); 655 return -1; 656 } 657 658 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) { 659 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 660 "decrypt IGTK"); 661 return -1; 662 } 663 664 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ 665 666 keyidx = WPA_GET_LE16(igtk_elem); 667 668 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, 669 WPA_IGTK_LEN); 670 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, 671 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { 672 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " 673 "driver."); 674 return -1; 675 } 676 677 return 0; 678} 679#endif /* CONFIG_IEEE80211W */ 680 681 682int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, 683 size_t ies_len, const u8 *src_addr) 684{ 685 struct wpa_ft_ies parse; 686 struct rsn_mdie *mdie; 687 struct rsn_ftie *ftie; 688 unsigned int count; 689 u8 mic[16]; 690 691 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 692 693 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 694 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 695 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 696 "enabled for this connection"); 697 return -1; 698 } 699 700 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 701 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 702 return -1; 703 } 704 705 mdie = (struct rsn_mdie *) parse.mdie; 706 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 707 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 708 MOBILITY_DOMAIN_ID_LEN) != 0) { 709 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 710 return -1; 711 } 712 713 ftie = (struct rsn_ftie *) parse.ftie; 714 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 715 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 716 return -1; 717 } 718 719 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 720 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 721 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 722 ftie->snonce, WPA_NONCE_LEN); 723 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 724 sm->snonce, WPA_NONCE_LEN); 725 return -1; 726 } 727 728 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { 729 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 730 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 731 ftie->anonce, WPA_NONCE_LEN); 732 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 733 sm->anonce, WPA_NONCE_LEN); 734 return -1; 735 } 736 737 if (parse.r0kh_id == NULL) { 738 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 739 return -1; 740 } 741 742 if (parse.r0kh_id_len != sm->r0kh_id_len || 743 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 744 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 745 "the current R0KH-ID"); 746 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 747 parse.r0kh_id, parse.r0kh_id_len); 748 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 749 sm->r0kh_id, sm->r0kh_id_len); 750 return -1; 751 } 752 753 if (parse.r1kh_id == NULL) { 754 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 755 return -1; 756 } 757 758 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { 759 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 760 "ReassocResp"); 761 return -1; 762 } 763 764 if (parse.rsn_pmkid == NULL || 765 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 766 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 767 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 768 return -1; 769 } 770 771 count = 3; 772 if (parse.ric) 773 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 774 if (ftie->mic_control[1] != count) { 775 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 776 "Control: received %u expected %u", 777 ftie->mic_control[1], count); 778 return -1; 779 } 780 781 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6, 782 parse.mdie - 2, parse.mdie_len + 2, 783 parse.ftie - 2, parse.ftie_len + 2, 784 parse.rsn - 2, parse.rsn_len + 2, 785 parse.ric, parse.ric_len, 786 mic) < 0) { 787 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 788 return -1; 789 } 790 791 if (os_memcmp(mic, ftie->mic, 16) != 0) { 792 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 793 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 794 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 795 return -1; 796 } 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 */ 818 } 819 820 return 0; 821} 822 823 824/** 825 * wpa_ft_start_over_ds - Generate over-the-DS auth request 826 * @sm: Pointer to WPA state machine data from wpa_sm_init() 827 * @target_ap: Target AP Address 828 * @mdie: Mobility Domain IE from the target AP 829 * Returns: 0 on success, -1 on failure 830 */ 831int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, 832 const u8 *mdie) 833{ 834 u8 *ft_ies; 835 size_t ft_ies_len; 836 837 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, 838 MAC2STR(target_ap)); 839 840 /* Generate a new SNonce */ 841 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 842 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 843 return -1; 844 } 845 846 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 847 NULL, target_ap, NULL, 0, mdie); 848 if (ft_ies) { 849 sm->over_the_ds_in_progress = 1; 850 os_memcpy(sm->target_ap, target_ap, ETH_ALEN); 851 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); 852 os_free(ft_ies); 853 } 854 855 return 0; 856} 857 858#endif /* CONFIG_IEEE80211R */ 859