wpa_ft.c revision 8d520ff1dc2da35cdca849e982051b86468016d8
1/* 2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15#include "includes.h" 16 17#include "common.h" 18#include "crypto/aes_wrap.h" 19#include "crypto/random.h" 20#include "common/ieee802_11_defs.h" 21#include "common/ieee802_11_common.h" 22#include "wpa.h" 23#include "wpa_i.h" 24#include "wpa_ie.h" 25 26#ifdef CONFIG_IEEE80211R 27 28struct wpa_ft_ies { 29 const u8 *mdie; 30 size_t mdie_len; 31 const u8 *ftie; 32 size_t ftie_len; 33 const u8 *r1kh_id; 34 const u8 *gtk; 35 size_t gtk_len; 36 const u8 *r0kh_id; 37 size_t r0kh_id_len; 38 const u8 *rsn; 39 size_t rsn_len; 40 const u8 *rsn_pmkid; 41 const u8 *tie; 42 size_t tie_len; 43 const u8 *igtk; 44 size_t igtk_len; 45 const u8 *ric; 46 size_t ric_len; 47}; 48 49static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, 50 struct wpa_ft_ies *parse); 51 52 53int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr, 54 const struct wpa_eapol_key *key, 55 struct wpa_ptk *ptk, size_t ptk_len) 56{ 57 u8 ptk_name[WPA_PMK_NAME_LEN]; 58 const u8 *anonce = key->key_nonce; 59 60 if (sm->xxkey_len == 0) { 61 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 62 "derivation"); 63 return -1; 64 } 65 66 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid, 67 sm->ssid_len, sm->mobility_domain, 68 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr, 69 sm->pmk_r0, sm->pmk_r0_name); 70 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN); 71 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", 72 sm->pmk_r0_name, WPA_PMK_NAME_LEN); 73 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 74 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 75 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 76 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 77 WPA_PMK_NAME_LEN); 78 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, 79 sm->bssid, sm->pmk_r1_name, 80 (u8 *) ptk, ptk_len, ptk_name); 81 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); 82 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 83 84 return 0; 85} 86 87 88/** 89 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters 90 * @sm: Pointer to WPA state machine data from wpa_sm_init() 91 * @ies: Association Response IEs or %NULL to clear FT parameters 92 * @ies_len: Length of ies buffer in octets 93 * Returns: 0 on success, -1 on failure 94 */ 95int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len) 96{ 97 struct wpa_ft_ies ft; 98 99 if (sm == NULL) 100 return 0; 101 102 if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0) 103 return -1; 104 105 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1) 106 return -1; 107 108 if (ft.mdie) { 109 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain", 110 ft.mdie, MOBILITY_DOMAIN_ID_LEN); 111 os_memcpy(sm->mobility_domain, ft.mdie, 112 MOBILITY_DOMAIN_ID_LEN); 113 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN]; 114 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x", 115 sm->mdie_ft_capab); 116 } else 117 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN); 118 119 if (ft.r0kh_id) { 120 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", 121 ft.r0kh_id, ft.r0kh_id_len); 122 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len); 123 sm->r0kh_id_len = ft.r0kh_id_len; 124 } else { 125 /* FIX: When should R0KH-ID be cleared? We need to keep the 126 * old R0KH-ID in order to be able to use this during FT. */ 127 /* 128 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN); 129 * sm->r0kh_id_len = 0; 130 */ 131 } 132 133 if (ft.r1kh_id) { 134 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", 135 ft.r1kh_id, FT_R1KH_ID_LEN); 136 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN); 137 } else 138 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN); 139 140 os_free(sm->assoc_resp_ies); 141 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2); 142 if (sm->assoc_resp_ies) { 143 u8 *pos = sm->assoc_resp_ies; 144 if (ft.mdie) { 145 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2); 146 pos += ft.mdie_len + 2; 147 } 148 if (ft.ftie) { 149 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2); 150 pos += ft.ftie_len + 2; 151 } 152 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies; 153 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from " 154 "(Re)Association Response", 155 sm->assoc_resp_ies, sm->assoc_resp_ies_len); 156 } 157 158 return 0; 159} 160 161 162/** 163 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request 164 * @sm: Pointer to WPA state machine data from wpa_sm_init() 165 * @len: Buffer for returning the length of the IEs 166 * @anonce: ANonce or %NULL if not yet available 167 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List 168 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used 169 * @target_ap: Target AP address 170 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL 171 * @ric_ies_len: Length of ric_ies buffer in octets 172 * @ap_mdie: Mobility Domain IE from the target AP 173 * Returns: Pointer to buffer with IEs or %NULL on failure 174 * 175 * Caller is responsible for freeing the returned buffer with os_free(); 176 */ 177static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len, 178 const u8 *anonce, const u8 *pmk_name, 179 const u8 *kck, const u8 *target_ap, 180 const u8 *ric_ies, size_t ric_ies_len, 181 const u8 *ap_mdie) 182{ 183 size_t buf_len; 184 u8 *buf, *pos, *ftie_len, *ftie_pos; 185 struct rsn_mdie *mdie; 186 struct rsn_ftie *ftie; 187 struct rsn_ie_hdr *rsnie; 188 u16 capab; 189 190 sm->ft_completed = 0; 191 192 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 193 2 + sm->r0kh_id_len + ric_ies_len + 100; 194 buf = os_zalloc(buf_len); 195 if (buf == NULL) 196 return NULL; 197 pos = buf; 198 199 /* RSNIE[PMKR0Name/PMKR1Name] */ 200 rsnie = (struct rsn_ie_hdr *) pos; 201 rsnie->elem_id = WLAN_EID_RSN; 202 WPA_PUT_LE16(rsnie->version, RSN_VERSION); 203 pos = (u8 *) (rsnie + 1); 204 205 /* Group Suite Selector */ 206 if (sm->group_cipher == WPA_CIPHER_CCMP) 207 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 208 else if (sm->group_cipher == WPA_CIPHER_TKIP) 209 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 210 else { 211 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", 212 sm->group_cipher); 213 os_free(buf); 214 return NULL; 215 } 216 pos += RSN_SELECTOR_LEN; 217 218 /* Pairwise Suite Count */ 219 WPA_PUT_LE16(pos, 1); 220 pos += 2; 221 222 /* Pairwise Suite List */ 223 if (sm->pairwise_cipher == WPA_CIPHER_CCMP) 224 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 225 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP) 226 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 227 else { 228 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", 229 sm->pairwise_cipher); 230 os_free(buf); 231 return NULL; 232 } 233 pos += RSN_SELECTOR_LEN; 234 235 /* Authenticated Key Management Suite Count */ 236 WPA_PUT_LE16(pos, 1); 237 pos += 2; 238 239 /* Authenticated Key Management Suite List */ 240 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) 241 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 242 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK) 243 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 244 else { 245 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", 246 sm->key_mgmt); 247 os_free(buf); 248 return NULL; 249 } 250 pos += RSN_SELECTOR_LEN; 251 252 /* RSN Capabilities */ 253 capab = 0; 254#ifdef CONFIG_IEEE80211W 255 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) 256 capab |= WPA_CAPABILITY_MFPC; 257#endif /* CONFIG_IEEE80211W */ 258 WPA_PUT_LE16(pos, capab); 259 pos += 2; 260 261 /* PMKID Count */ 262 WPA_PUT_LE16(pos, 1); 263 pos += 2; 264 265 /* PMKID List [PMKR0Name/PMKR1Name] */ 266 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); 267 pos += WPA_PMK_NAME_LEN; 268 269#ifdef CONFIG_IEEE80211W 270 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 271 /* Management Group Cipher Suite */ 272 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 273 pos += RSN_SELECTOR_LEN; 274 } 275#endif /* CONFIG_IEEE80211W */ 276 277 rsnie->len = (pos - (u8 *) rsnie) - 2; 278 279 /* MDIE */ 280 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 281 *pos++ = sizeof(*mdie); 282 mdie = (struct rsn_mdie *) pos; 283 pos += sizeof(*mdie); 284 os_memcpy(mdie->mobility_domain, sm->mobility_domain, 285 MOBILITY_DOMAIN_ID_LEN); 286 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : 287 sm->mdie_ft_capab; 288 289 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ 290 ftie_pos = pos; 291 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 292 ftie_len = pos++; 293 ftie = (struct rsn_ftie *) pos; 294 pos += sizeof(*ftie); 295 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); 296 if (anonce) 297 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); 298 if (kck) { 299 /* R1KH-ID sub-element in third FT message */ 300 *pos++ = FTIE_SUBELEM_R1KH_ID; 301 *pos++ = FT_R1KH_ID_LEN; 302 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); 303 pos += FT_R1KH_ID_LEN; 304 } 305 /* R0KH-ID sub-element */ 306 *pos++ = FTIE_SUBELEM_R0KH_ID; 307 *pos++ = sm->r0kh_id_len; 308 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); 309 pos += sm->r0kh_id_len; 310 *ftie_len = pos - ftie_len - 1; 311 312 if (ric_ies) { 313 /* RIC Request */ 314 os_memcpy(pos, ric_ies, ric_ies_len); 315 pos += ric_ies_len; 316 } 317 318 if (kck) { 319 /* 320 * IEEE Std 802.11r-2008, 11A.8.4 321 * MIC shall be calculated over: 322 * non-AP STA MAC address 323 * Target AP MAC address 324 * Transaction seq number (5 for ReassocReq, 3 otherwise) 325 * RSN IE 326 * MDIE 327 * FTIE (with MIC field set to 0) 328 * RIC-Request (if present) 329 */ 330 /* Information element count */ 331 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, 332 ric_ies_len); 333 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5, 334 ((u8 *) mdie) - 2, 2 + sizeof(*mdie), 335 ftie_pos, 2 + *ftie_len, 336 (u8 *) rsnie, 2 + rsnie->len, ric_ies, 337 ric_ies_len, ftie->mic) < 0) { 338 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); 339 os_free(buf); 340 return NULL; 341 } 342 } 343 344 *len = pos - buf; 345 346 return buf; 347} 348 349 350static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len, 351 struct wpa_ft_ies *parse) 352{ 353 const u8 *end, *pos; 354 355 parse->ftie = ie; 356 parse->ftie_len = ie_len; 357 358 pos = ie + sizeof(struct rsn_ftie); 359 end = ie + ie_len; 360 361 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 362 switch (pos[0]) { 363 case FTIE_SUBELEM_R1KH_ID: 364 if (pos[1] != FT_R1KH_ID_LEN) { 365 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID " 366 "length in FTIE: %d", pos[1]); 367 return -1; 368 } 369 parse->r1kh_id = pos + 2; 370 break; 371 case FTIE_SUBELEM_GTK: 372 parse->gtk = pos + 2; 373 parse->gtk_len = pos[1]; 374 break; 375 case FTIE_SUBELEM_R0KH_ID: 376 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) { 377 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID " 378 "length in FTIE: %d", pos[1]); 379 return -1; 380 } 381 parse->r0kh_id = pos + 2; 382 parse->r0kh_id_len = pos[1]; 383 break; 384#ifdef CONFIG_IEEE80211W 385 case FTIE_SUBELEM_IGTK: 386 parse->igtk = pos + 2; 387 parse->igtk_len = pos[1]; 388 break; 389#endif /* CONFIG_IEEE80211W */ 390 } 391 392 pos += 2 + pos[1]; 393 } 394 395 return 0; 396} 397 398 399static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, 400 struct wpa_ft_ies *parse) 401{ 402 const u8 *end, *pos; 403 struct wpa_ie_data data; 404 int ret; 405 const struct rsn_ftie *ftie; 406 int prot_ie_count = 0; 407 408 os_memset(parse, 0, sizeof(*parse)); 409 if (ies == NULL) 410 return 0; 411 412 pos = ies; 413 end = ies + ies_len; 414 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 415 switch (pos[0]) { 416 case WLAN_EID_RSN: 417 parse->rsn = pos + 2; 418 parse->rsn_len = pos[1]; 419 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2, 420 parse->rsn_len + 2, 421 &data); 422 if (ret < 0) { 423 wpa_printf(MSG_DEBUG, "FT: Failed to parse " 424 "RSN IE: %d", ret); 425 return -1; 426 } 427 if (data.num_pmkid == 1 && data.pmkid) 428 parse->rsn_pmkid = data.pmkid; 429 break; 430 case WLAN_EID_MOBILITY_DOMAIN: 431 parse->mdie = pos + 2; 432 parse->mdie_len = pos[1]; 433 break; 434 case WLAN_EID_FAST_BSS_TRANSITION: 435 if (pos[1] < sizeof(*ftie)) 436 return -1; 437 ftie = (const struct rsn_ftie *) (pos + 2); 438 prot_ie_count = ftie->mic_control[1]; 439 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0) 440 return -1; 441 break; 442 case WLAN_EID_TIMEOUT_INTERVAL: 443 parse->tie = pos + 2; 444 parse->tie_len = pos[1]; 445 break; 446 case WLAN_EID_RIC_DATA: 447 if (parse->ric == NULL) 448 parse->ric = pos; 449 } 450 451 pos += 2 + pos[1]; 452 } 453 454 if (prot_ie_count == 0) 455 return 0; /* no MIC */ 456 457 /* 458 * Check that the protected IE count matches with IEs included in the 459 * frame. 460 */ 461 if (parse->rsn) 462 prot_ie_count--; 463 if (parse->mdie) 464 prot_ie_count--; 465 if (parse->ftie) 466 prot_ie_count--; 467 if (parse->tie) 468 prot_ie_count--; 469 if (prot_ie_count < 0) { 470 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in " 471 "the protected IE count"); 472 return -1; 473 } 474 475 if (prot_ie_count == 0 && parse->ric) { 476 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not " 477 "included in protected IE count"); 478 return -1; 479 } 480 481 /* Determine the end of the RIC IE(s) */ 482 pos = parse->ric; 483 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end && 484 prot_ie_count) { 485 prot_ie_count--; 486 pos += 2 + pos[1]; 487 } 488 parse->ric_len = pos - parse->ric; 489 if (prot_ie_count) { 490 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from " 491 "frame", (int) prot_ie_count); 492 return -1; 493 } 494 495 return 0; 496} 497 498 499static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) 500{ 501 int keylen; 502 enum wpa_alg alg; 503 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; 504 505 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); 506 507 switch (sm->pairwise_cipher) { 508 case WPA_CIPHER_CCMP: 509 alg = WPA_ALG_CCMP; 510 keylen = 16; 511 break; 512 case WPA_CIPHER_TKIP: 513 alg = WPA_ALG_TKIP; 514 keylen = 32; 515 break; 516 default: 517 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", 518 sm->pairwise_cipher); 519 return -1; 520 } 521 522 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, 523 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) { 524 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); 525 return -1; 526 } 527 528 return 0; 529} 530 531 532/** 533 * wpa_ft_prepare_auth_request - Generate over-the-air auth request 534 * @sm: Pointer to WPA state machine data from wpa_sm_init() 535 * @mdie: Target AP MDIE 536 * Returns: 0 on success, -1 on failure 537 */ 538int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) 539{ 540 u8 *ft_ies; 541 size_t ft_ies_len; 542 543 /* Generate a new SNonce */ 544 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 545 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 546 return -1; 547 } 548 549 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 550 NULL, sm->bssid, NULL, 0, mdie); 551 if (ft_ies) { 552 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 553 ft_ies, ft_ies_len); 554 os_free(ft_ies); 555 } 556 557 return 0; 558} 559 560 561int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, 562 int ft_action, const u8 *target_ap, 563 const u8 *ric_ies, size_t ric_ies_len) 564{ 565 u8 *ft_ies; 566 size_t ft_ies_len, ptk_len; 567 struct wpa_ft_ies parse; 568 struct rsn_mdie *mdie; 569 struct rsn_ftie *ftie; 570 u8 ptk_name[WPA_PMK_NAME_LEN]; 571 int ret; 572 const u8 *bssid; 573 574 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 575 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); 576 577 if (ft_action) { 578 if (!sm->over_the_ds_in_progress) { 579 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 580 "- drop FT Action Response"); 581 return -1; 582 } 583 584 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { 585 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 586 "with this Target AP - drop FT Action " 587 "Response"); 588 return -1; 589 } 590 } 591 592 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 593 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 594 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 595 "enabled for this connection"); 596 return -1; 597 } 598 599 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 600 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 601 return -1; 602 } 603 604 mdie = (struct rsn_mdie *) parse.mdie; 605 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 606 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 607 MOBILITY_DOMAIN_ID_LEN) != 0) { 608 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 609 return -1; 610 } 611 612 ftie = (struct rsn_ftie *) parse.ftie; 613 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 614 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 615 return -1; 616 } 617 618 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 619 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 620 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 621 ftie->snonce, WPA_NONCE_LEN); 622 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 623 sm->snonce, WPA_NONCE_LEN); 624 return -1; 625 } 626 627 if (parse.r0kh_id == NULL) { 628 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 629 return -1; 630 } 631 632 if (parse.r0kh_id_len != sm->r0kh_id_len || 633 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 634 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 635 "the current R0KH-ID"); 636 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 637 parse.r0kh_id, parse.r0kh_id_len); 638 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 639 sm->r0kh_id, sm->r0kh_id_len); 640 return -1; 641 } 642 643 if (parse.r1kh_id == NULL) { 644 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 645 return -1; 646 } 647 648 if (parse.rsn_pmkid == NULL || 649 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) { 650 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " 651 "RSNIE"); 652 return -1; 653 } 654 655 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 656 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); 657 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); 658 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); 659 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); 660 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 661 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 662 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 663 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", 664 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 665 666 bssid = target_ap; 667 ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64; 668 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr, 669 bssid, sm->pmk_r1_name, 670 (u8 *) &sm->ptk, ptk_len, ptk_name); 671 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 672 (u8 *) &sm->ptk, ptk_len); 673 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 674 675 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, 676 sm->pmk_r1_name, sm->ptk.kck, bssid, 677 ric_ies, ric_ies_len, 678 parse.mdie ? parse.mdie - 2 : NULL); 679 if (ft_ies) { 680 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 681 ft_ies, ft_ies_len); 682 os_free(ft_ies); 683 } 684 685 wpa_sm_mark_authenticated(sm, bssid); 686 ret = wpa_ft_install_ptk(sm, bssid); 687 if (ret) { 688 /* 689 * Some drivers do not support key configuration when we are 690 * not associated with the target AP. Work around this by 691 * trying again after the following reassociation gets 692 * completed. 693 */ 694 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " 695 "association - try again after reassociation"); 696 sm->set_ptk_after_assoc = 1; 697 } else 698 sm->set_ptk_after_assoc = 0; 699 700 sm->ft_completed = 1; 701 if (ft_action) { 702 /* 703 * The caller is expected trigger re-association with the 704 * Target AP. 705 */ 706 os_memcpy(sm->bssid, target_ap, ETH_ALEN); 707 } 708 709 return 0; 710} 711 712 713int wpa_ft_is_completed(struct wpa_sm *sm) 714{ 715 if (sm == NULL) 716 return 0; 717 718 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 719 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) 720 return 0; 721 722 return sm->ft_completed; 723} 724 725 726static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem, 727 size_t gtk_elem_len) 728{ 729 u8 gtk[32]; 730 int keyidx; 731 enum wpa_alg alg; 732 size_t gtk_len, keylen, rsc_len; 733 734 if (gtk_elem == NULL) { 735 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE"); 736 return 0; 737 } 738 739 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp", 740 gtk_elem, gtk_elem_len); 741 742 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 || 743 gtk_elem_len - 19 > sizeof(gtk)) { 744 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " 745 "length %lu", (unsigned long) gtk_elem_len); 746 return -1; 747 } 748 gtk_len = gtk_elem_len - 19; 749 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) { 750 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 751 "decrypt GTK"); 752 return -1; 753 } 754 755 switch (sm->group_cipher) { 756 case WPA_CIPHER_CCMP: 757 keylen = 16; 758 rsc_len = 6; 759 alg = WPA_ALG_CCMP; 760 break; 761 case WPA_CIPHER_TKIP: 762 keylen = 32; 763 rsc_len = 6; 764 alg = WPA_ALG_TKIP; 765 break; 766 case WPA_CIPHER_WEP104: 767 keylen = 13; 768 rsc_len = 0; 769 alg = WPA_ALG_WEP; 770 break; 771 case WPA_CIPHER_WEP40: 772 keylen = 5; 773 rsc_len = 0; 774 alg = WPA_ALG_WEP; 775 break; 776 default: 777 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", 778 sm->group_cipher); 779 return -1; 780 } 781 782 if (gtk_len < keylen) { 783 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); 784 return -1; 785 } 786 787 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ 788 789 keyidx = WPA_GET_LE16(gtk_elem) & 0x03; 790 791 if (gtk_elem[2] != keylen) { 792 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " 793 "negotiated %lu", 794 gtk_elem[2], (unsigned long) keylen); 795 return -1; 796 } 797 798 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); 799 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, 800 gtk_elem + 3, rsc_len, gtk, keylen) < 0) { 801 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " 802 "driver."); 803 return -1; 804 } 805 806 return 0; 807} 808 809 810#ifdef CONFIG_IEEE80211W 811static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, 812 size_t igtk_elem_len) 813{ 814 u8 igtk[WPA_IGTK_LEN]; 815 u16 keyidx; 816 817 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 818 return 0; 819 820 if (igtk_elem == NULL) { 821 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); 822 return 0; 823 } 824 825 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", 826 igtk_elem, igtk_elem_len); 827 828 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { 829 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " 830 "length %lu", (unsigned long) igtk_elem_len); 831 return -1; 832 } 833 if (igtk_elem[8] != WPA_IGTK_LEN) { 834 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " 835 "%d", igtk_elem[8]); 836 return -1; 837 } 838 839 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) { 840 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 841 "decrypt IGTK"); 842 return -1; 843 } 844 845 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ 846 847 keyidx = WPA_GET_LE16(igtk_elem); 848 849 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, 850 WPA_IGTK_LEN); 851 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, 852 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { 853 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " 854 "driver."); 855 return -1; 856 } 857 858 return 0; 859} 860#endif /* CONFIG_IEEE80211W */ 861 862 863int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, 864 size_t ies_len, const u8 *src_addr) 865{ 866 struct wpa_ft_ies parse; 867 struct rsn_mdie *mdie; 868 struct rsn_ftie *ftie; 869 unsigned int count; 870 u8 mic[16]; 871 872 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 873 874 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 875 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 876 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 877 "enabled for this connection"); 878 return -1; 879 } 880 881 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 882 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 883 return -1; 884 } 885 886 mdie = (struct rsn_mdie *) parse.mdie; 887 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 888 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 889 MOBILITY_DOMAIN_ID_LEN) != 0) { 890 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 891 return -1; 892 } 893 894 ftie = (struct rsn_ftie *) parse.ftie; 895 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 896 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 897 return -1; 898 } 899 900 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { 901 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 902 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 903 ftie->snonce, WPA_NONCE_LEN); 904 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 905 sm->snonce, WPA_NONCE_LEN); 906 return -1; 907 } 908 909 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { 910 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 911 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 912 ftie->anonce, WPA_NONCE_LEN); 913 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 914 sm->anonce, WPA_NONCE_LEN); 915 return -1; 916 } 917 918 if (parse.r0kh_id == NULL) { 919 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 920 return -1; 921 } 922 923 if (parse.r0kh_id_len != sm->r0kh_id_len || 924 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 925 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 926 "the current R0KH-ID"); 927 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 928 parse.r0kh_id, parse.r0kh_id_len); 929 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 930 sm->r0kh_id, sm->r0kh_id_len); 931 return -1; 932 } 933 934 if (parse.r1kh_id == NULL) { 935 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 936 return -1; 937 } 938 939 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { 940 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 941 "ReassocResp"); 942 return -1; 943 } 944 945 if (parse.rsn_pmkid == NULL || 946 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 947 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 948 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 949 return -1; 950 } 951 952 count = 3; 953 if (parse.tie) 954 count++; 955 if (ftie->mic_control[1] != count) { 956 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 957 "Control: received %u expected %u", 958 ftie->mic_control[1], count); 959 return -1; 960 } 961 962 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6, 963 parse.mdie - 2, parse.mdie_len + 2, 964 parse.ftie - 2, parse.ftie_len + 2, 965 parse.rsn - 2, parse.rsn_len + 2, 966 parse.ric, parse.ric_len, 967 mic) < 0) { 968 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 969 return -1; 970 } 971 972 if (os_memcmp(mic, ftie->mic, 16) != 0) { 973 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 974 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 975 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 976 return -1; 977 } 978 979 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) 980 return -1; 981 982#ifdef CONFIG_IEEE80211W 983 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) 984 return -1; 985#endif /* CONFIG_IEEE80211W */ 986 987 if (sm->set_ptk_after_assoc) { 988 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " 989 "are associated"); 990 if (wpa_ft_install_ptk(sm, src_addr) < 0) 991 return -1; 992 sm->set_ptk_after_assoc = 0; 993 } 994 995 if (parse.ric) { 996 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", 997 parse.ric, parse.ric_len); 998 /* TODO: parse response and inform driver about results */ 999 } 1000 1001 return 0; 1002} 1003 1004 1005/** 1006 * wpa_ft_start_over_ds - Generate over-the-DS auth request 1007 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1008 * @target_ap: Target AP Address 1009 * @mdie: Mobility Domain IE from the target AP 1010 * Returns: 0 on success, -1 on failure 1011 */ 1012int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, 1013 const u8 *mdie) 1014{ 1015 u8 *ft_ies; 1016 size_t ft_ies_len; 1017 1018 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, 1019 MAC2STR(target_ap)); 1020 1021 /* Generate a new SNonce */ 1022 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 1023 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 1024 return -1; 1025 } 1026 1027 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 1028 NULL, target_ap, NULL, 0, mdie); 1029 if (ft_ies) { 1030 sm->over_the_ds_in_progress = 1; 1031 os_memcpy(sm->target_ap, target_ap, ETH_ALEN); 1032 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); 1033 os_free(ft_ies); 1034 } 1035 1036 return 0; 1037} 1038 1039#endif /* CONFIG_IEEE80211R */ 1040