wpa_ft.c revision 189251
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 "wpa.h" 19#include "wpa_i.h" 20#include "wpa_ie.h" 21#include "aes_wrap.h" 22#include "ieee802_11_defs.h" 23 24#ifdef CONFIG_IEEE80211R 25 26int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr, 27 const struct wpa_eapol_key *key, 28 struct wpa_ptk *ptk) 29{ 30 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 31 u8 ptk_name[WPA_PMK_NAME_LEN]; 32 const u8 *anonce = key->key_nonce; 33 34 if (sm->xxkey_len == 0) { 35 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 36 "derivation"); 37 return -1; 38 } 39 40 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid, 41 sm->ssid_len, sm->mobility_domain, 42 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr, 43 sm->pmk_r0, sm->pmk_r0_name); 44 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN); 45 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", 46 sm->pmk_r0_name, WPA_PMK_NAME_LEN); 47 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 48 sm->own_addr, sm->pmk_r1, pmk_r1_name); 49 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 50 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN); 51 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, 52 sm->bssid, pmk_r1_name, 53 (u8 *) ptk, sizeof(*ptk), ptk_name); 54 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk)); 55 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 56 57 return 0; 58} 59 60 61/** 62 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters 63 * @sm: Pointer to WPA state machine data from wpa_sm_init() 64 * @mobility_domain: Mobility domain identifier (2 octets) 65 * @r0kh_id: PMK-R0 key holder identity (1-48 octets) 66 * @r0kh_id_len: R0KH-ID length (1-48) 67 * @r1kh_id: PMK-R1 key holder identity (16 octets) 68 * Returns: 0 on success, -1 on failure 69 */ 70int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *mobility_domain, 71 const u8 *r0kh_id, size_t r0kh_id_len, 72 const u8 *r1kh_id) 73{ 74 if (sm && mobility_domain) { 75 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain", 76 mobility_domain, MOBILITY_DOMAIN_ID_LEN); 77 os_memcpy(sm->mobility_domain, mobility_domain, 78 MOBILITY_DOMAIN_ID_LEN); 79 } else if (sm) 80 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN); 81 82 if (sm && r0kh_id) { 83 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN) 84 return -1; 85 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len); 86 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len); 87 sm->r0kh_id_len = r0kh_id_len; 88 } else if (sm) { 89 /* FIX: When should R0KH-ID be cleared? We need to keep the 90 * old R0KH-ID in order to be able to use this during FT. */ 91 /* 92 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN); 93 * sm->r0kh_id_len = 0; 94 */ 95 } 96 97 if (sm && r1kh_id) { 98 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN); 99 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN); 100 } else if (sm) 101 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN); 102 103 return 0; 104} 105 106 107/** 108 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth Request 109 * @sm: Pointer to WPA state machine data from wpa_sm_init() 110 * @len: Buffer for returning the length of the IEs 111 * @anonce: ANonce or %NULL if not yet available 112 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List 113 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used 114 * @target_ap: Target AP address 115 * Returns: Pointer to buffer with IEs or %NULL on failure 116 * 117 * Caller is responsible for freeing the returned buffer with os_free(); 118 */ 119static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len, 120 const u8 *anonce, const u8 *pmk_name, 121 const u8 *kck, const u8 *target_ap) 122{ 123 size_t buf_len; 124 u8 *buf, *pos, *ftie_len, *ftie_pos; 125 struct rsn_mdie *mdie; 126 struct rsn_ftie *ftie; 127 struct rsn_ie_hdr *rsnie; 128 u16 capab; 129 130 sm->ft_completed = 0; 131 132 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 133 2 + sm->r0kh_id_len + 100; 134 buf = os_zalloc(buf_len); 135 if (buf == NULL) 136 return NULL; 137 pos = buf; 138 139 /* RSNIE[PMKR0Name] */ 140 rsnie = (struct rsn_ie_hdr *) pos; 141 rsnie->elem_id = WLAN_EID_RSN; 142 WPA_PUT_LE16(rsnie->version, RSN_VERSION); 143 pos = (u8 *) (rsnie + 1); 144 145 /* Group Suite Selector */ 146 if (sm->group_cipher == WPA_CIPHER_CCMP) 147 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 148 else if (sm->group_cipher == WPA_CIPHER_TKIP) 149 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 150 else { 151 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", 152 sm->group_cipher); 153 os_free(buf); 154 return NULL; 155 } 156 pos += RSN_SELECTOR_LEN; 157 158 /* Pairwise Suite Count */ 159 WPA_PUT_LE16(pos, 1); 160 pos += 2; 161 162 /* Pairwise Suite List */ 163 if (sm->pairwise_cipher == WPA_CIPHER_CCMP) 164 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 165 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP) 166 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 167 else { 168 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", 169 sm->pairwise_cipher); 170 os_free(buf); 171 return NULL; 172 } 173 pos += RSN_SELECTOR_LEN; 174 175 /* Authenticated Key Management Suite Count */ 176 WPA_PUT_LE16(pos, 1); 177 pos += 2; 178 179 /* Authenticated Key Management Suite List */ 180 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) 181 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 182 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK) 183 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 184 else { 185 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", 186 sm->key_mgmt); 187 os_free(buf); 188 return NULL; 189 } 190 pos += RSN_SELECTOR_LEN; 191 192 /* RSN Capabilities */ 193 capab = 0; 194#ifdef CONFIG_IEEE80211W 195 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) 196 capab |= WPA_CAPABILITY_MFPC; 197#endif /* CONFIG_IEEE80211W */ 198 WPA_PUT_LE16(pos, capab); 199 pos += 2; 200 201 /* PMKID Count */ 202 WPA_PUT_LE16(pos, 1); 203 pos += 2; 204 205 /* PMKID List [PMKR0Name/PMKR1Name] */ 206 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); 207 pos += WPA_PMK_NAME_LEN; 208 209#ifdef CONFIG_IEEE80211W 210 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 211 /* Management Group Cipher Suite */ 212 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 213 pos += RSN_SELECTOR_LEN; 214 } 215#endif /* CONFIG_IEEE80211W */ 216 217 rsnie->len = (pos - (u8 *) rsnie) - 2; 218 219 /* MDIE */ 220 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 221 *pos++ = sizeof(*mdie); 222 mdie = (struct rsn_mdie *) pos; 223 pos += sizeof(*mdie); 224 os_memcpy(mdie->mobility_domain, sm->mobility_domain, 225 MOBILITY_DOMAIN_ID_LEN); 226 mdie->ft_capab = 0; /* FIX: copy from the target AP's MDIE */ 227 228 /* FTIE[SNonce, R0KH-ID] */ 229 ftie_pos = pos; 230 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 231 ftie_len = pos++; 232 ftie = (struct rsn_ftie *) pos; 233 pos += sizeof(*ftie); 234 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); 235 if (anonce) 236 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); 237 /* R0KH-ID sub-element */ 238 *pos++ = FTIE_SUBELEM_R0KH_ID; 239 *pos++ = sm->r0kh_id_len; 240 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); 241 pos += sm->r0kh_id_len; 242 *ftie_len = pos - ftie_len - 1; 243 244 if (kck) { 245 /* 246 * IEEE Std 802.11r-2008, 11A.8.4 247 * MIC shall be calculated over: 248 * non-AP STA MAC address 249 * Target AP MAC address 250 * Transaction seq number (5 for ReassocReq, 3 otherwise) 251 * RSN IE 252 * MDIE 253 * FTIE (with MIC field set to 0) 254 * RIC-Request (if present) 255 */ 256 ftie->mic_control[1] = 3; /* Information element count */ 257 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5, 258 ((u8 *) mdie) - 2, 2 + sizeof(*mdie), 259 ftie_pos, 2 + *ftie_len, 260 (u8 *) rsnie, 2 + rsnie->len, NULL, 0, 261 ftie->mic) < 0) { 262 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); 263 os_free(buf); 264 return NULL; 265 } 266 } 267 268 *len = pos - buf; 269 270 return buf; 271} 272 273 274struct wpa_ft_ies { 275 const u8 *mdie; 276 size_t mdie_len; 277 const u8 *ftie; 278 size_t ftie_len; 279 const u8 *r1kh_id; 280 const u8 *gtk; 281 size_t gtk_len; 282 const u8 *r0kh_id; 283 size_t r0kh_id_len; 284 const u8 *rsn; 285 size_t rsn_len; 286 const u8 *rsn_pmkid; 287 const u8 *tie; 288 size_t tie_len; 289 const u8 *igtk; 290 size_t igtk_len; 291}; 292 293 294static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len, 295 struct wpa_ft_ies *parse) 296{ 297 const u8 *end, *pos; 298 299 parse->ftie = ie; 300 parse->ftie_len = ie_len; 301 302 pos = ie + sizeof(struct rsn_ftie); 303 end = ie + ie_len; 304 305 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 306 switch (pos[0]) { 307 case FTIE_SUBELEM_R1KH_ID: 308 if (pos[1] != FT_R1KH_ID_LEN) { 309 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID " 310 "length in FTIE: %d", pos[1]); 311 return -1; 312 } 313 parse->r1kh_id = pos + 2; 314 break; 315 case FTIE_SUBELEM_GTK: 316 parse->gtk = pos + 2; 317 parse->gtk_len = pos[1]; 318 break; 319 case FTIE_SUBELEM_R0KH_ID: 320 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) { 321 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID " 322 "length in FTIE: %d", pos[1]); 323 return -1; 324 } 325 parse->r0kh_id = pos + 2; 326 parse->r0kh_id_len = pos[1]; 327 break; 328#ifdef CONFIG_IEEE80211W 329 case FTIE_SUBELEM_IGTK: 330 parse->igtk = pos + 2; 331 parse->igtk_len = pos[1]; 332 break; 333#endif /* CONFIG_IEEE80211W */ 334 } 335 336 pos += 2 + pos[1]; 337 } 338 339 return 0; 340} 341 342 343static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, 344 struct wpa_ft_ies *parse) 345{ 346 const u8 *end, *pos; 347 struct wpa_ie_data data; 348 int ret; 349 350 os_memset(parse, 0, sizeof(*parse)); 351 if (ies == NULL) 352 return 0; 353 354 pos = ies; 355 end = ies + ies_len; 356 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 357 switch (pos[0]) { 358 case WLAN_EID_RSN: 359 parse->rsn = pos + 2; 360 parse->rsn_len = pos[1]; 361 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2, 362 parse->rsn_len + 2, 363 &data); 364 if (ret < 0) { 365 wpa_printf(MSG_DEBUG, "FT: Failed to parse " 366 "RSN IE: %d", ret); 367 return -1; 368 } 369 if (data.num_pmkid == 1 && data.pmkid) 370 parse->rsn_pmkid = data.pmkid; 371 break; 372 case WLAN_EID_MOBILITY_DOMAIN: 373 parse->mdie = pos + 2; 374 parse->mdie_len = pos[1]; 375 break; 376 case WLAN_EID_FAST_BSS_TRANSITION: 377 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0) 378 return -1; 379 break; 380 case WLAN_EID_TIMEOUT_INTERVAL: 381 parse->tie = pos + 2; 382 parse->tie_len = pos[1]; 383 break; 384 } 385 386 pos += 2 + pos[1]; 387 } 388 389 return 0; 390} 391 392 393static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) 394{ 395 int keylen; 396 wpa_alg alg; 397 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; 398 399 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); 400 401 switch (sm->pairwise_cipher) { 402 case WPA_CIPHER_CCMP: 403 alg = WPA_ALG_CCMP; 404 keylen = 16; 405 break; 406 case WPA_CIPHER_TKIP: 407 alg = WPA_ALG_TKIP; 408 keylen = 32; 409 break; 410 default: 411 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", 412 sm->pairwise_cipher); 413 return -1; 414 } 415 416 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, 417 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) { 418 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); 419 return -1; 420 } 421 422 return 0; 423} 424 425 426/** 427 * wpa_ft_prepare_auth_request - Generate over-the-air auth request 428 * @sm: Pointer to WPA state machine data from wpa_sm_init() 429 * Returns: 0 on success, -1 on failure 430 */ 431int wpa_ft_prepare_auth_request(struct wpa_sm *sm) 432{ 433 u8 *ft_ies; 434 size_t ft_ies_len; 435 436 /* Generate a new SNonce */ 437 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) { 438 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 439 return -1; 440 } 441 442 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 443 NULL, sm->bssid); 444 if (ft_ies) { 445 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 446 ft_ies, ft_ies_len); 447 os_free(ft_ies); 448 } 449 450 return 0; 451} 452 453 454int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, 455 int ft_action, const u8 *target_ap) 456{ 457 u8 *ft_ies; 458 size_t ft_ies_len; 459 struct wpa_ft_ies parse; 460 struct rsn_mdie *mdie; 461 struct rsn_ftie *ftie; 462 u8 ptk_name[WPA_PMK_NAME_LEN]; 463 int ret; 464 const u8 *bssid; 465 466 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 467 468 if (ft_action) { 469 if (!sm->over_the_ds_in_progress) { 470 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 471 "- drop FT Action Response"); 472 return -1; 473 } 474 475 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { 476 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " 477 "with this Target AP - drop FT Action " 478 "Response"); 479 return -1; 480 } 481 } 482 483 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 484 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 485 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 486 "enabled for this connection"); 487 return -1; 488 } 489 490 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 491 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 492 return -1; 493 } 494 495 mdie = (struct rsn_mdie *) parse.mdie; 496 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 497 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 498 MOBILITY_DOMAIN_ID_LEN) != 0) { 499 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 500 return -1; 501 } 502 503 ftie = (struct rsn_ftie *) parse.ftie; 504 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 505 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 506 return -1; 507 } 508 509 if (parse.r0kh_id == NULL) { 510 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 511 return -1; 512 } 513 514 if (parse.r0kh_id_len != sm->r0kh_id_len || 515 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 516 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 517 "the current R0KH-ID"); 518 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 519 parse.r0kh_id, parse.r0kh_id_len); 520 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 521 sm->r0kh_id, sm->r0kh_id_len); 522 return -1; 523 } 524 525 if (parse.r1kh_id == NULL) { 526 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 527 return -1; 528 } 529 530 if (parse.rsn_pmkid == NULL || 531 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) { 532 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " 533 "RSNIE"); 534 return -1; 535 } 536 537 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 538 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); 539 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); 540 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); 541 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, 542 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); 543 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); 544 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", 545 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 546 547 bssid = target_ap; 548 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr, 549 bssid, sm->pmk_r1_name, 550 (u8 *) &sm->ptk, sizeof(sm->ptk), ptk_name); 551 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 552 (u8 *) &sm->ptk, sizeof(sm->ptk)); 553 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 554 555 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, 556 sm->pmk_r1_name, sm->ptk.kck, bssid); 557 if (ft_ies) { 558 wpa_sm_update_ft_ies(sm, sm->mobility_domain, 559 ft_ies, ft_ies_len); 560 os_free(ft_ies); 561 } 562 563 ret = wpa_ft_install_ptk(sm, bssid); 564 565 if (ret == 0) { 566 sm->ft_completed = 1; 567 if (ft_action) { 568 /* TODO: trigger re-association to the Target AP; 569 * MLME is now doing this automatically, but it should 570 * really be done only if we get here successfully. */ 571 os_memcpy(sm->bssid, target_ap, ETH_ALEN); 572 } 573 } 574 575 return ret; 576} 577 578 579int wpa_ft_is_completed(struct wpa_sm *sm) 580{ 581 if (sm == NULL) 582 return 0; 583 584 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 585 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) 586 return 0; 587 588 return sm->ft_completed; 589} 590 591 592static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem, 593 size_t gtk_elem_len) 594{ 595 u8 gtk[32]; 596 int keyidx; 597 wpa_alg alg; 598 size_t gtk_len, keylen, rsc_len; 599 600 if (gtk_elem == NULL) { 601 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE"); 602 return 0; 603 } 604 605 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp", 606 gtk_elem, gtk_elem_len); 607 608 if (gtk_elem_len < 10 + 24 || (gtk_elem_len - 10) % 8 || 609 gtk_elem_len - 18 > sizeof(gtk)) { 610 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " 611 "length %lu", (unsigned long) gtk_elem_len); 612 return -1; 613 } 614 gtk_len = gtk_elem_len - 18; 615 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 10, gtk)) { 616 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 617 "decrypt GTK"); 618 return -1; 619 } 620 621 switch (sm->group_cipher) { 622 case WPA_CIPHER_CCMP: 623 keylen = 16; 624 rsc_len = 6; 625 alg = WPA_ALG_CCMP; 626 break; 627 case WPA_CIPHER_TKIP: 628 keylen = 32; 629 rsc_len = 6; 630 alg = WPA_ALG_TKIP; 631 break; 632 case WPA_CIPHER_WEP104: 633 keylen = 13; 634 rsc_len = 0; 635 alg = WPA_ALG_WEP; 636 break; 637 case WPA_CIPHER_WEP40: 638 keylen = 5; 639 rsc_len = 0; 640 alg = WPA_ALG_WEP; 641 break; 642 default: 643 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", 644 sm->group_cipher); 645 return -1; 646 } 647 648 if (gtk_len < keylen) { 649 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); 650 return -1; 651 } 652 653 /* Key Info[1] | Key Length[1] | RSC[8] | Key[5..32]. */ 654 655 keyidx = gtk_elem[0] & 0x03; 656 657 if (gtk_elem[1] != keylen) { 658 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " 659 "negotiated %lu", 660 gtk_elem[1], (unsigned long) keylen); 661 return -1; 662 } 663 664 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); 665 if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff", 666 keyidx, 0, gtk_elem + 2, rsc_len, gtk, keylen) < 667 0) { 668 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " 669 "driver."); 670 return -1; 671 } 672 673 return 0; 674} 675 676 677#ifdef CONFIG_IEEE80211W 678static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, 679 size_t igtk_elem_len) 680{ 681 u8 igtk[WPA_IGTK_LEN]; 682 u16 keyidx; 683 684 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 685 return 0; 686 687 if (igtk_elem == NULL) { 688 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); 689 return 0; 690 } 691 692 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", 693 igtk_elem, igtk_elem_len); 694 695 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { 696 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " 697 "length %lu", (unsigned long) igtk_elem_len); 698 return -1; 699 } 700 if (igtk_elem[8] != WPA_IGTK_LEN) { 701 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " 702 "%d", igtk_elem[8]); 703 return -1; 704 } 705 706 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) { 707 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " 708 "decrypt IGTK"); 709 return -1; 710 } 711 712 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ 713 714 keyidx = WPA_GET_LE16(igtk_elem); 715 716 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, 717 WPA_IGTK_LEN); 718 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff", 719 keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 720 0) { 721 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " 722 "driver."); 723 return -1; 724 } 725 726 return 0; 727} 728#endif /* CONFIG_IEEE80211W */ 729 730 731int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, 732 size_t ies_len, const u8 *src_addr) 733{ 734 struct wpa_ft_ies parse; 735 struct rsn_mdie *mdie; 736 struct rsn_ftie *ftie; 737 size_t count; 738 u8 mic[16]; 739 740 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); 741 742 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 743 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { 744 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " 745 "enabled for this connection"); 746 return -1; 747 } 748 749 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 750 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); 751 return -1; 752 } 753 754 mdie = (struct rsn_mdie *) parse.mdie; 755 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 756 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 757 MOBILITY_DOMAIN_ID_LEN) != 0) { 758 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 759 return -1; 760 } 761 762 ftie = (struct rsn_ftie *) parse.ftie; 763 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 764 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 765 return -1; 766 } 767 768 if (parse.r0kh_id == NULL) { 769 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 770 return -1; 771 } 772 773 if (parse.r0kh_id_len != sm->r0kh_id_len || 774 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 775 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 776 "the current R0KH-ID"); 777 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 778 parse.r0kh_id, parse.r0kh_id_len); 779 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 780 sm->r0kh_id, sm->r0kh_id_len); 781 return -1; 782 } 783 784 if (parse.r1kh_id == NULL) { 785 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 786 return -1; 787 } 788 789 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { 790 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 791 "ReassocResp"); 792 return -1; 793 } 794 795 if (parse.rsn_pmkid == NULL || 796 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 797 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 798 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 799 return -1; 800 } 801 802 count = 3; 803 if (parse.tie) 804 count++; 805 806 if (ftie->mic_control[1] != count) { 807 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)", 808 ftie->mic_control[1]); 809 return -1; 810 } 811 812 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6, 813 parse.mdie - 2, parse.mdie_len + 2, 814 parse.ftie - 2, parse.ftie_len + 2, 815 parse.rsn - 2, parse.rsn_len + 2, NULL, 0, 816 mic) < 0) { 817 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 818 return -1; 819 } 820 821 if (os_memcmp(mic, ftie->mic, 16) != 0) { 822 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 823 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 824 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 825 return -1; 826 } 827 828 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) 829 return -1; 830 831#ifdef CONFIG_IEEE80211W 832 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) 833 return -1; 834#endif /* CONFIG_IEEE80211W */ 835 836 return 0; 837} 838 839 840/** 841 * wpa_ft_start_over_ds - Generate over-the-DS auth request 842 * @sm: Pointer to WPA state machine data from wpa_sm_init() 843 * Returns: 0 on success, -1 on failure 844 */ 845int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap) 846{ 847 u8 *ft_ies; 848 size_t ft_ies_len; 849 850 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, 851 MAC2STR(target_ap)); 852 853 /* Generate a new SNonce */ 854 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) { 855 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); 856 return -1; 857 } 858 859 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, 860 NULL, target_ap); 861 if (ft_ies) { 862 sm->over_the_ds_in_progress = 1; 863 os_memcpy(sm->target_ap, target_ap, ETH_ALEN); 864 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); 865 os_free(ft_ies); 866 } 867 868 return 0; 869} 870 871#endif /* CONFIG_IEEE80211R */ 872