wpa_ft.c revision 4b06059785b935dd1f4f09314e4e12c417d2c6a4
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 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 { 211 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", 212 sm->key_mgmt); 213 os_free(buf); 214 return NULL; 215 } 216 pos += RSN_SELECTOR_LEN; 217 218 /* RSN Capabilities */ 219 capab = 0; 220#ifdef CONFIG_IEEE80211W 221 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) 222 capab |= WPA_CAPABILITY_MFPC; 223#endif /* CONFIG_IEEE80211W */ 224 WPA_PUT_LE16(pos, capab); 225 pos += 2; 226 227 /* PMKID Count */ 228 WPA_PUT_LE16(pos, 1); 229 pos += 2; 230 231 /* PMKID List [PMKR0Name/PMKR1Name] */ 232 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); 233 pos += WPA_PMK_NAME_LEN; 234 235#ifdef CONFIG_IEEE80211W 236 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 237 /* Management Group Cipher Suite */ 238 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 239 pos += RSN_SELECTOR_LEN; 240 } 241#endif /* CONFIG_IEEE80211W */ 242 243 rsnie->len = (pos - (u8 *) rsnie) - 2; 244 245 /* MDIE */ 246 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 247 *pos++ = sizeof(*mdie); 248 mdie = (struct rsn_mdie *) pos; 249 pos += sizeof(*mdie); 250 os_memcpy(mdie->mobility_domain, sm->mobility_domain, 251 MOBILITY_DOMAIN_ID_LEN); 252 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : 253 sm->mdie_ft_capab; 254 255 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ 256 ftie_pos = pos; 257 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 258 ftie_len = pos++; 259 ftie = (struct rsn_ftie *) pos; 260 pos += sizeof(*ftie); 261 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); 262 if (anonce) 263 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); 264 if (kck) { 265 /* R1KH-ID sub-element in third FT message */ 266 *pos++ = FTIE_SUBELEM_R1KH_ID; 267 *pos++ = FT_R1KH_ID_LEN; 268 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); 269 pos += FT_R1KH_ID_LEN; 270 } 271 /* R0KH-ID sub-element */ 272 *pos++ = FTIE_SUBELEM_R0KH_ID; 273 *pos++ = sm->r0kh_id_len; 274 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); 275 pos += sm->r0kh_id_len; 276 *ftie_len = pos - ftie_len - 1; 277 278 if (ric_ies) { 279 /* RIC Request */ 280 os_memcpy(pos, ric_ies, ric_ies_len); 281 pos += ric_ies_len; 282 } 283 284 if (kck) { 285 /* 286 * IEEE Std 802.11r-2008, 11A.8.4 287 * MIC shall be calculated over: 288 * non-AP STA MAC address 289 * Target AP MAC address 290 * Transaction seq number (5 for ReassocReq, 3 otherwise) 291 * RSN IE 292 * MDIE 293 * FTIE (with MIC field set to 0) 294 * RIC-Request (if present) 295 */ 296 /* Information element count */ 297 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, 298 ric_ies_len); 299 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5, 300 ((u8 *) mdie) - 2, 2 + sizeof(*mdie), 301 ftie_pos, 2 + *ftie_len, 302 (u8 *) rsnie, 2 + rsnie->len, ric_ies, 303 ric_ies_len, ftie->mic) < 0) { 304 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); 305 os_free(buf); 306 return NULL; 307 } 308 } 309 310 *len = pos - buf; 311 312 return buf; 313} 314 315 316static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) 317{ 318 int keylen; 319 enum wpa_alg alg; 320 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; 321 322 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); 323 324 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 325 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", 326 sm->pairwise_cipher); 327 return -1; 328 } 329 330 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 331 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 332 333 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, 334 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) { 335 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); 336 return -1; 337 } 338 339 return 0; 340} 341 342 343/** 344 * wpa_ft_prepare_auth_request - Generate over-the-air auth request 345 * @sm: Pointer to WPA state machine data from wpa_sm_init() 346 * @mdie: Target AP MDIE 347 * Returns: 0 on success, -1 on failure 348 */ 349int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) 350{ 351 u8 *ft_ies; 352 size_t ft_ies_len; 353 354 /* Generate a new SNonce */ 355 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 356 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 357 return -1; 358 } 359 360 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 361 NULL, sm->bssid, NULL, 0, mdie); 362 if (ft_ies) { 363 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 364 ft_ies, ft_ies_len); 365 os_free(ft_ies); 366 } 367 368 return 0; 369} 370 371 372int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, 373 int ft_action, const u8 *target_ap, 374 const u8 *ric_ies, size_t ric_ies_len) 375{ 376 u8 *ft_ies; 377 size_t ft_ies_len, ptk_len; 378 struct wpa_ft_ies parse; 379 struct rsn_mdie *mdie; 380 struct rsn_ftie *ftie; 381 u8 ptk_name[WPA_PMK_NAME_LEN]; 382 int ret; 383 const u8 *bssid; 384 385 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 386 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); 387 388 if (ft_action) { 389 if (!sm->over_the_ds_in_progress) { 390 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 391 "- drop FT Action Response"); 392 return -1; 393 } 394 395 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { 396 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 397 "with this Target AP - drop FT Action " 398 "Response"); 399 return -1; 400 } 401 } 402 403 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 404 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 405 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 406 "enabled for this connection"); 407 return -1; 408 } 409 410 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 411 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 412 return -1; 413 } 414 415 mdie = (struct rsn_mdie *) parse.mdie; 416 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 417 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 418 MOBILITY_DOMAIN_ID_LEN) != 0) { 419 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 420 return -1; 421 } 422 423 ftie = (struct rsn_ftie *) parse.ftie; 424 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 425 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 426 return -1; 427 } 428 429 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 430 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 431 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 432 ftie->snonce, WPA_NONCE_LEN); 433 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 434 sm->snonce, WPA_NONCE_LEN); 435 return -1; 436 } 437 438 if (parse.r0kh_id == NULL) { 439 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 440 return -1; 441 } 442 443 if (parse.r0kh_id_len != sm->r0kh_id_len || 444 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 445 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 446 "the current R0KH-ID"); 447 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 448 parse.r0kh_id, parse.r0kh_id_len); 449 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 450 sm->r0kh_id, sm->r0kh_id_len); 451 return -1; 452 } 453 454 if (parse.r1kh_id == NULL) { 455 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 456 return -1; 457 } 458 459 if (parse.rsn_pmkid == NULL || 460 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) { 461 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " 462 "RSNIE"); 463 return -1; 464 } 465 466 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 467 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); 468 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); 469 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); 470 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); 471 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 472 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 473 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 474 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", 475 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 476 477 bssid = target_ap; 478 ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64; 479 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr, 480 bssid, sm->pmk_r1_name, 481 (u8 *) &sm->ptk, ptk_len, ptk_name); 482 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 483 (u8 *) &sm->ptk, ptk_len); 484 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 485 486 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, 487 sm->pmk_r1_name, sm->ptk.kck, bssid, 488 ric_ies, ric_ies_len, 489 parse.mdie ? parse.mdie - 2 : NULL); 490 if (ft_ies) { 491 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 492 ft_ies, ft_ies_len); 493 os_free(ft_ies); 494 } 495 496 wpa_sm_mark_authenticated(sm, bssid); 497 ret = wpa_ft_install_ptk(sm, bssid); 498 if (ret) { 499 /* 500 * Some drivers do not support key configuration when we are 501 * not associated with the target AP. Work around this by 502 * trying again after the following reassociation gets 503 * completed. 504 */ 505 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " 506 "association - try again after reassociation"); 507 sm->set_ptk_after_assoc = 1; 508 } else 509 sm->set_ptk_after_assoc = 0; 510 511 sm->ft_completed = 1; 512 if (ft_action) { 513 /* 514 * The caller is expected trigger re-association with the 515 * Target AP. 516 */ 517 os_memcpy(sm->bssid, target_ap, ETH_ALEN); 518 } 519 520 return 0; 521} 522 523 524int wpa_ft_is_completed(struct wpa_sm *sm) 525{ 526 if (sm == NULL) 527 return 0; 528 529 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 530 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) 531 return 0; 532 533 return sm->ft_completed; 534} 535 536 537void wpa_reset_ft_completed(struct wpa_sm *sm) 538{ 539 if (sm != NULL) 540 sm->ft_completed = 0; 541} 542 543 544static 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 (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, 600 gtk_elem + 3, rsc_len, gtk, keylen) < 0) { 601 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " 602 "driver."); 603 return -1; 604 } 605 606 return 0; 607} 608 609 610#ifdef CONFIG_IEEE80211W 611static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, 612 size_t igtk_elem_len) 613{ 614 u8 igtk[WPA_IGTK_LEN]; 615 u16 keyidx; 616 617 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 618 return 0; 619 620 if (igtk_elem == NULL) { 621 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); 622 return 0; 623 } 624 625 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", 626 igtk_elem, igtk_elem_len); 627 628 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { 629 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " 630 "length %lu", (unsigned long) igtk_elem_len); 631 return -1; 632 } 633 if (igtk_elem[8] != WPA_IGTK_LEN) { 634 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " 635 "%d", igtk_elem[8]); 636 return -1; 637 } 638 639 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) { 640 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 641 "decrypt IGTK"); 642 return -1; 643 } 644 645 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ 646 647 keyidx = WPA_GET_LE16(igtk_elem); 648 649 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, 650 WPA_IGTK_LEN); 651 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, 652 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { 653 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " 654 "driver."); 655 return -1; 656 } 657 658 return 0; 659} 660#endif /* CONFIG_IEEE80211W */ 661 662 663int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, 664 size_t ies_len, const u8 *src_addr) 665{ 666 struct wpa_ft_ies parse; 667 struct rsn_mdie *mdie; 668 struct rsn_ftie *ftie; 669 unsigned int count; 670 u8 mic[16]; 671 672 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 673 674 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 675 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 676 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 677 "enabled for this connection"); 678 return -1; 679 } 680 681 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 682 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 683 return -1; 684 } 685 686 mdie = (struct rsn_mdie *) parse.mdie; 687 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 688 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 689 MOBILITY_DOMAIN_ID_LEN) != 0) { 690 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 691 return -1; 692 } 693 694 ftie = (struct rsn_ftie *) parse.ftie; 695 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 696 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 697 return -1; 698 } 699 700 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 701 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 702 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 703 ftie->snonce, WPA_NONCE_LEN); 704 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 705 sm->snonce, WPA_NONCE_LEN); 706 return -1; 707 } 708 709 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { 710 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 711 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 712 ftie->anonce, WPA_NONCE_LEN); 713 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 714 sm->anonce, WPA_NONCE_LEN); 715 return -1; 716 } 717 718 if (parse.r0kh_id == NULL) { 719 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 720 return -1; 721 } 722 723 if (parse.r0kh_id_len != sm->r0kh_id_len || 724 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 725 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 726 "the current R0KH-ID"); 727 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 728 parse.r0kh_id, parse.r0kh_id_len); 729 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 730 sm->r0kh_id, sm->r0kh_id_len); 731 return -1; 732 } 733 734 if (parse.r1kh_id == NULL) { 735 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 736 return -1; 737 } 738 739 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { 740 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 741 "ReassocResp"); 742 return -1; 743 } 744 745 if (parse.rsn_pmkid == NULL || 746 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 747 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 748 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 749 return -1; 750 } 751 752 count = 3; 753 if (parse.ric) 754 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 755 if (ftie->mic_control[1] != count) { 756 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 757 "Control: received %u expected %u", 758 ftie->mic_control[1], count); 759 return -1; 760 } 761 762 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6, 763 parse.mdie - 2, parse.mdie_len + 2, 764 parse.ftie - 2, parse.ftie_len + 2, 765 parse.rsn - 2, parse.rsn_len + 2, 766 parse.ric, parse.ric_len, 767 mic) < 0) { 768 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 769 return -1; 770 } 771 772 if (os_memcmp(mic, ftie->mic, 16) != 0) { 773 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 774 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 775 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 776 return -1; 777 } 778 779 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) 780 return -1; 781 782#ifdef CONFIG_IEEE80211W 783 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) 784 return -1; 785#endif /* CONFIG_IEEE80211W */ 786 787 if (sm->set_ptk_after_assoc) { 788 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " 789 "are associated"); 790 if (wpa_ft_install_ptk(sm, src_addr) < 0) 791 return -1; 792 sm->set_ptk_after_assoc = 0; 793 } 794 795 if (parse.ric) { 796 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", 797 parse.ric, parse.ric_len); 798 /* TODO: parse response and inform driver about results when 799 * using wpa_supplicant SME */ 800 } 801 802 wpa_printf(MSG_DEBUG, "FT: Completed successfully"); 803 804 return 0; 805} 806 807 808/** 809 * wpa_ft_start_over_ds - Generate over-the-DS auth request 810 * @sm: Pointer to WPA state machine data from wpa_sm_init() 811 * @target_ap: Target AP Address 812 * @mdie: Mobility Domain IE from the target AP 813 * Returns: 0 on success, -1 on failure 814 */ 815int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, 816 const u8 *mdie) 817{ 818 u8 *ft_ies; 819 size_t ft_ies_len; 820 821 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, 822 MAC2STR(target_ap)); 823 824 /* Generate a new SNonce */ 825 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 826 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 827 return -1; 828 } 829 830 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 831 NULL, target_ap, NULL, 0, mdie); 832 if (ft_ies) { 833 sm->over_the_ds_in_progress = 1; 834 os_memcpy(sm->target_ap, target_ap, ETH_ALEN); 835 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); 836 os_free(ft_ies); 837 } 838 839 return 0; 840} 841 842#endif /* CONFIG_IEEE80211R */ 843