1 /* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2009, 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 "utils/includes.h" 16 17 #include "utils/common.h" 18 #include "common/ieee802_11_defs.h" 19 #include "common/ieee802_11_common.h" 20 #include "crypto/aes_wrap.h" 21 #include "ap_config.h" 22 #include "ieee802_11.h" 23 #include "wmm.h" 24 #include "wpa_auth.h" 25 #include "wpa_auth_i.h" 26 #include "wpa_auth_ie.h" 27 28 29 #ifdef CONFIG_IEEE80211R 30 31 struct wpa_ft_ies { 32 const u8 *mdie; 33 size_t mdie_len; 34 const u8 *ftie; 35 size_t ftie_len; 36 const u8 *r1kh_id; 37 const u8 *gtk; 38 size_t gtk_len; 39 const u8 *r0kh_id; 40 size_t r0kh_id_len; 41 const u8 *rsn; 42 size_t rsn_len; 43 const u8 *rsn_pmkid; 44 const u8 *ric; 45 size_t ric_len; 46 }; 47 48 49 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, 50 struct wpa_ft_ies *parse); 51 52 53 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, 54 const u8 *data, size_t data_len) 55 { 56 if (wpa_auth->cb.send_ether == NULL) 57 return -1; 58 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB, 59 data, data_len); 60 } 61 62 63 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, 64 const u8 *dst, const u8 *data, size_t data_len) 65 { 66 if (wpa_auth->cb.send_ft_action == NULL) 67 return -1; 68 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst, 69 data, data_len); 70 } 71 72 73 static struct wpa_state_machine * 74 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) 75 { 76 if (wpa_auth->cb.add_sta == NULL) 77 return NULL; 78 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr); 79 } 80 81 82 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) 83 { 84 u8 *pos = buf; 85 u8 capab; 86 if (len < 2 + sizeof(struct rsn_mdie)) 87 return -1; 88 89 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 90 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; 91 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 92 pos += MOBILITY_DOMAIN_ID_LEN; 93 capab = RSN_FT_CAPAB_FT_OVER_DS; 94 *pos++ = capab; 95 96 return pos - buf; 97 } 98 99 100 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, 101 size_t r0kh_id_len, 102 const u8 *anonce, const u8 *snonce, 103 u8 *buf, size_t len, const u8 *subelem, 104 size_t subelem_len) 105 { 106 u8 *pos = buf, *ielen; 107 struct rsn_ftie *hdr; 108 109 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + 110 subelem_len) 111 return -1; 112 113 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 114 ielen = pos++; 115 116 hdr = (struct rsn_ftie *) pos; 117 os_memset(hdr, 0, sizeof(*hdr)); 118 pos += sizeof(*hdr); 119 WPA_PUT_LE16(hdr->mic_control, 0); 120 if (anonce) 121 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); 122 if (snonce) 123 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); 124 125 /* Optional Parameters */ 126 *pos++ = FTIE_SUBELEM_R1KH_ID; 127 *pos++ = FT_R1KH_ID_LEN; 128 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); 129 pos += FT_R1KH_ID_LEN; 130 131 if (r0kh_id) { 132 *pos++ = FTIE_SUBELEM_R0KH_ID; 133 *pos++ = r0kh_id_len; 134 os_memcpy(pos, r0kh_id, r0kh_id_len); 135 pos += r0kh_id_len; 136 } 137 138 if (subelem) { 139 os_memcpy(pos, subelem, subelem_len); 140 pos += subelem_len; 141 } 142 143 *ielen = pos - buf - 2; 144 145 return pos - buf; 146 } 147 148 149 struct wpa_ft_pmk_r0_sa { 150 struct wpa_ft_pmk_r0_sa *next; 151 u8 pmk_r0[PMK_LEN]; 152 u8 pmk_r0_name[WPA_PMK_NAME_LEN]; 153 u8 spa[ETH_ALEN]; 154 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 155 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 156 int pmk_r1_pushed; 157 }; 158 159 struct wpa_ft_pmk_r1_sa { 160 struct wpa_ft_pmk_r1_sa *next; 161 u8 pmk_r1[PMK_LEN]; 162 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 163 u8 spa[ETH_ALEN]; 164 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 165 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 166 }; 167 168 struct wpa_ft_pmk_cache { 169 struct wpa_ft_pmk_r0_sa *pmk_r0; 170 struct wpa_ft_pmk_r1_sa *pmk_r1; 171 }; 172 173 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) 174 { 175 struct wpa_ft_pmk_cache *cache; 176 177 cache = os_zalloc(sizeof(*cache)); 178 179 return cache; 180 } 181 182 183 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) 184 { 185 struct wpa_ft_pmk_r0_sa *r0, *r0prev; 186 struct wpa_ft_pmk_r1_sa *r1, *r1prev; 187 188 r0 = cache->pmk_r0; 189 while (r0) { 190 r0prev = r0; 191 r0 = r0->next; 192 os_memset(r0prev->pmk_r0, 0, PMK_LEN); 193 os_free(r0prev); 194 } 195 196 r1 = cache->pmk_r1; 197 while (r1) { 198 r1prev = r1; 199 r1 = r1->next; 200 os_memset(r1prev->pmk_r1, 0, PMK_LEN); 201 os_free(r1prev); 202 } 203 204 os_free(cache); 205 } 206 207 208 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, 209 const u8 *spa, const u8 *pmk_r0, 210 const u8 *pmk_r0_name, int pairwise) 211 { 212 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 213 struct wpa_ft_pmk_r0_sa *r0; 214 215 /* TODO: add expiration and limit on number of entries in cache */ 216 217 r0 = os_zalloc(sizeof(*r0)); 218 if (r0 == NULL) 219 return -1; 220 221 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); 222 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 223 os_memcpy(r0->spa, spa, ETH_ALEN); 224 r0->pairwise = pairwise; 225 226 r0->next = cache->pmk_r0; 227 cache->pmk_r0 = r0; 228 229 return 0; 230 } 231 232 233 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, 234 const u8 *spa, const u8 *pmk_r0_name, 235 u8 *pmk_r0, int *pairwise) 236 { 237 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 238 struct wpa_ft_pmk_r0_sa *r0; 239 240 r0 = cache->pmk_r0; 241 while (r0) { 242 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && 243 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN) 244 == 0) { 245 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); 246 if (pairwise) 247 *pairwise = r0->pairwise; 248 return 0; 249 } 250 251 r0 = r0->next; 252 } 253 254 return -1; 255 } 256 257 258 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, 259 const u8 *spa, const u8 *pmk_r1, 260 const u8 *pmk_r1_name, int pairwise) 261 { 262 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 263 struct wpa_ft_pmk_r1_sa *r1; 264 265 /* TODO: add expiration and limit on number of entries in cache */ 266 267 r1 = os_zalloc(sizeof(*r1)); 268 if (r1 == NULL) 269 return -1; 270 271 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); 272 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 273 os_memcpy(r1->spa, spa, ETH_ALEN); 274 r1->pairwise = pairwise; 275 276 r1->next = cache->pmk_r1; 277 cache->pmk_r1 = r1; 278 279 return 0; 280 } 281 282 283 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, 284 const u8 *spa, const u8 *pmk_r1_name, 285 u8 *pmk_r1, int *pairwise) 286 { 287 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 288 struct wpa_ft_pmk_r1_sa *r1; 289 290 r1 = cache->pmk_r1; 291 while (r1) { 292 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && 293 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN) 294 == 0) { 295 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); 296 if (pairwise) 297 *pairwise = r1->pairwise; 298 return 0; 299 } 300 301 r1 = r1->next; 302 } 303 304 return -1; 305 } 306 307 308 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth, 309 const u8 *s1kh_id, const u8 *r0kh_id, 310 size_t r0kh_id_len, const u8 *pmk_r0_name) 311 { 312 struct ft_remote_r0kh *r0kh; 313 struct ft_r0kh_r1kh_pull_frame frame, f; 314 315 r0kh = wpa_auth->conf.r0kh_list; 316 while (r0kh) { 317 if (r0kh->id_len == r0kh_id_len && 318 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0) 319 break; 320 r0kh = r0kh->next; 321 } 322 if (r0kh == NULL) 323 return -1; 324 325 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 326 "address " MACSTR, MAC2STR(r0kh->addr)); 327 328 os_memset(&frame, 0, sizeof(frame)); 329 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 330 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 331 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 332 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 333 334 /* aes_wrap() does not support inplace encryption, so use a temporary 335 * buffer for the data. */ 336 if (os_get_random(f.nonce, sizeof(f.nonce))) { 337 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 338 "nonce"); 339 return -1; 340 } 341 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 342 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 343 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 344 345 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 346 f.nonce, frame.nonce) < 0) 347 return -1; 348 349 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 350 351 return 0; 352 } 353 354 355 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 356 struct wpa_ptk *ptk, size_t ptk_len) 357 { 358 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 359 u8 pmk_r1[PMK_LEN]; 360 u8 ptk_name[WPA_PMK_NAME_LEN]; 361 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 362 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 363 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 364 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 365 const u8 *ssid = sm->wpa_auth->conf.ssid; 366 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 367 368 369 if (sm->xxkey_len == 0) { 370 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 371 "derivation"); 372 return -1; 373 } 374 375 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 376 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); 377 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 378 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 379 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 380 sm->pairwise); 381 382 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 383 pmk_r1, sm->pmk_r1_name); 384 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 385 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 386 WPA_PMK_NAME_LEN); 387 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name, 388 sm->pairwise); 389 390 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 391 sm->wpa_auth->addr, sm->pmk_r1_name, 392 (u8 *) ptk, ptk_len, ptk_name); 393 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); 394 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 395 396 return 0; 397 } 398 399 400 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 401 const u8 *addr, int idx, u8 *seq) 402 { 403 if (wpa_auth->cb.get_seqnum == NULL) 404 return -1; 405 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 406 } 407 408 409 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 410 { 411 u8 *subelem; 412 struct wpa_group *gsm = sm->group; 413 size_t subelem_len, pad_len; 414 const u8 *key; 415 size_t key_len; 416 u8 keybuf[32]; 417 418 key_len = gsm->GTK_len; 419 if (key_len > sizeof(keybuf)) 420 return NULL; 421 422 /* 423 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 424 * than 16 bytes. 425 */ 426 pad_len = key_len % 8; 427 if (pad_len) 428 pad_len = 8 - pad_len; 429 if (key_len + pad_len < 16) 430 pad_len += 8; 431 if (pad_len) { 432 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 433 os_memset(keybuf + key_len, 0, pad_len); 434 keybuf[key_len] = 0xdd; 435 key_len += pad_len; 436 key = keybuf; 437 } else 438 key = gsm->GTK[gsm->GN - 1]; 439 440 /* 441 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 442 * Key[5..32]. 443 */ 444 subelem_len = 13 + key_len + 8; 445 subelem = os_zalloc(subelem_len); 446 if (subelem == NULL) 447 return NULL; 448 449 subelem[0] = FTIE_SUBELEM_GTK; 450 subelem[1] = 11 + key_len + 8; 451 /* Key ID in B0-B1 of Key Info */ 452 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 453 subelem[4] = gsm->GTK_len; 454 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 455 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) { 456 os_free(subelem); 457 return NULL; 458 } 459 460 *len = subelem_len; 461 return subelem; 462 } 463 464 465 #ifdef CONFIG_IEEE80211W 466 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 467 { 468 u8 *subelem, *pos; 469 struct wpa_group *gsm = sm->group; 470 size_t subelem_len; 471 472 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 473 * Key[16+8] */ 474 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 475 subelem = os_zalloc(subelem_len); 476 if (subelem == NULL) 477 return NULL; 478 479 pos = subelem; 480 *pos++ = FTIE_SUBELEM_IGTK; 481 *pos++ = subelem_len - 2; 482 WPA_PUT_LE16(pos, gsm->GN_igtk); 483 pos += 2; 484 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 485 pos += 6; 486 *pos++ = WPA_IGTK_LEN; 487 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, 488 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 489 os_free(subelem); 490 return NULL; 491 } 492 493 *len = subelem_len; 494 return subelem; 495 } 496 #endif /* CONFIG_IEEE80211W */ 497 498 499 static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count, 500 const u8 *ies, size_t ies_len) 501 { 502 struct ieee802_11_elems parse; 503 struct rsn_rdie *rdie; 504 505 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 506 id, descr_count); 507 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 508 ies, ies_len); 509 510 if (end - pos < (int) sizeof(*rdie)) { 511 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 512 return pos; 513 } 514 515 *pos++ = WLAN_EID_RIC_DATA; 516 *pos++ = sizeof(*rdie); 517 rdie = (struct rsn_rdie *) pos; 518 rdie->id = id; 519 rdie->descr_count = 0; 520 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 521 pos += sizeof(*rdie); 522 523 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 524 ParseFailed) { 525 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 526 rdie->status_code = 527 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 528 return pos; 529 } 530 531 #ifdef NEED_AP_MLME 532 if (parse.wmm_tspec) { 533 struct wmm_tspec_element *tspec; 534 int res; 535 536 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 537 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 538 "(%d)", (int) parse.wmm_tspec_len); 539 rdie->status_code = 540 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 541 return pos; 542 } 543 if (end - pos < (int) sizeof(*tspec)) { 544 wpa_printf(MSG_ERROR, "FT: Not enough room for " 545 "response TSPEC"); 546 rdie->status_code = 547 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 548 return pos; 549 } 550 tspec = (struct wmm_tspec_element *) pos; 551 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 552 res = wmm_process_tspec(tspec); 553 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 554 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 555 rdie->status_code = 556 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 557 else if (res == WMM_ADDTS_STATUS_REFUSED) 558 rdie->status_code = 559 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 560 else { 561 /* TSPEC accepted; include updated TSPEC in response */ 562 rdie->descr_count = 1; 563 pos += sizeof(*tspec); 564 } 565 return pos; 566 } 567 #endif /* NEED_AP_MLME */ 568 569 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 570 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 571 return pos; 572 } 573 574 575 static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len) 576 { 577 const u8 *rpos, *start; 578 const struct rsn_rdie *rdie; 579 580 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 581 582 rpos = ric; 583 while (rpos + sizeof(*rdie) < ric + ric_len) { 584 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 585 rpos + 2 + rpos[1] > ric + ric_len) 586 break; 587 rdie = (const struct rsn_rdie *) (rpos + 2); 588 rpos += 2 + rpos[1]; 589 start = rpos; 590 591 while (rpos + 2 <= ric + ric_len && 592 rpos + 2 + rpos[1] <= ric + ric_len) { 593 if (rpos[0] == WLAN_EID_RIC_DATA) 594 break; 595 rpos += 2 + rpos[1]; 596 } 597 pos = wpa_ft_process_rdie(pos, end, rdie->id, 598 rdie->descr_count, 599 start, rpos - start); 600 } 601 602 return pos; 603 } 604 605 606 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 607 size_t max_len, int auth_alg, 608 const u8 *req_ies, size_t req_ies_len) 609 { 610 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 611 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 612 int res; 613 struct wpa_auth_config *conf; 614 struct rsn_ftie *_ftie; 615 struct wpa_ft_ies parse; 616 u8 *ric_start; 617 u8 *anonce, *snonce; 618 619 if (sm == NULL) 620 return pos; 621 622 conf = &sm->wpa_auth->conf; 623 624 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 625 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK) 626 return pos; 627 628 end = pos + max_len; 629 630 if (auth_alg == WLAN_AUTH_FT) { 631 /* 632 * RSN (only present if this is a Reassociation Response and 633 * part of a fast BSS transition) 634 */ 635 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 636 if (res < 0) 637 return pos; 638 rsnie = pos; 639 rsnie_len = res; 640 pos += res; 641 } 642 643 /* Mobility Domain Information */ 644 res = wpa_write_mdie(conf, pos, end - pos); 645 if (res < 0) 646 return pos; 647 mdie = pos; 648 mdie_len = res; 649 pos += res; 650 651 /* Fast BSS Transition Information */ 652 if (auth_alg == WLAN_AUTH_FT) { 653 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 654 r0kh_id = sm->r0kh_id; 655 r0kh_id_len = sm->r0kh_id_len; 656 anonce = sm->ANonce; 657 snonce = sm->SNonce; 658 #ifdef CONFIG_IEEE80211W 659 if (sm->mgmt_frame_prot) { 660 u8 *igtk; 661 size_t igtk_len; 662 u8 *nbuf; 663 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 664 if (igtk == NULL) { 665 os_free(subelem); 666 return pos; 667 } 668 nbuf = os_realloc(subelem, subelem_len + igtk_len); 669 if (nbuf == NULL) { 670 os_free(subelem); 671 os_free(igtk); 672 return pos; 673 } 674 subelem = nbuf; 675 os_memcpy(subelem + subelem_len, igtk, igtk_len); 676 subelem_len += igtk_len; 677 os_free(igtk); 678 } 679 #endif /* CONFIG_IEEE80211W */ 680 } else { 681 r0kh_id = conf->r0_key_holder; 682 r0kh_id_len = conf->r0_key_holder_len; 683 anonce = NULL; 684 snonce = NULL; 685 } 686 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 687 end - pos, subelem, subelem_len); 688 os_free(subelem); 689 if (res < 0) 690 return pos; 691 ftie = pos; 692 ftie_len = res; 693 pos += res; 694 695 os_free(sm->assoc_resp_ftie); 696 sm->assoc_resp_ftie = os_malloc(ftie_len); 697 if (sm->assoc_resp_ftie) 698 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 699 700 _ftie = (struct rsn_ftie *) (ftie + 2); 701 if (auth_alg == WLAN_AUTH_FT) 702 _ftie->mic_control[1] = 3; /* Information element count */ 703 704 ric_start = pos; 705 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 706 pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len); 707 if (auth_alg == WLAN_AUTH_FT) 708 _ftie->mic_control[1] += 709 ieee802_11_ie_count(ric_start, 710 pos - ric_start); 711 } 712 if (ric_start == pos) 713 ric_start = NULL; 714 715 if (auth_alg == WLAN_AUTH_FT && 716 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6, 717 mdie, mdie_len, ftie, ftie_len, 718 rsnie, rsnie_len, 719 ric_start, ric_start ? pos - ric_start : 0, 720 _ftie->mic) < 0) 721 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 722 723 return pos; 724 } 725 726 727 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len, 728 struct wpa_ft_ies *parse) 729 { 730 const u8 *end, *pos; 731 732 parse->ftie = ie; 733 parse->ftie_len = ie_len; 734 735 pos = ie + sizeof(struct rsn_ftie); 736 end = ie + ie_len; 737 738 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 739 switch (pos[0]) { 740 case FTIE_SUBELEM_R1KH_ID: 741 if (pos[1] != FT_R1KH_ID_LEN) { 742 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID " 743 "length in FTIE: %d", pos[1]); 744 return -1; 745 } 746 parse->r1kh_id = pos + 2; 747 break; 748 case FTIE_SUBELEM_GTK: 749 parse->gtk = pos + 2; 750 parse->gtk_len = pos[1]; 751 break; 752 case FTIE_SUBELEM_R0KH_ID: 753 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) { 754 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID " 755 "length in FTIE: %d", pos[1]); 756 return -1; 757 } 758 parse->r0kh_id = pos + 2; 759 parse->r0kh_id_len = pos[1]; 760 break; 761 } 762 763 pos += 2 + pos[1]; 764 } 765 766 return 0; 767 } 768 769 770 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, 771 struct wpa_ft_ies *parse) 772 { 773 const u8 *end, *pos; 774 struct wpa_ie_data data; 775 int ret; 776 const struct rsn_ftie *ftie; 777 int prot_ie_count = 0; 778 779 os_memset(parse, 0, sizeof(*parse)); 780 if (ies == NULL) 781 return 0; 782 783 pos = ies; 784 end = ies + ies_len; 785 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 786 switch (pos[0]) { 787 case WLAN_EID_RSN: 788 parse->rsn = pos + 2; 789 parse->rsn_len = pos[1]; 790 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2, 791 parse->rsn_len + 2, 792 &data); 793 if (ret < 0) { 794 wpa_printf(MSG_DEBUG, "FT: Failed to parse " 795 "RSN IE: %d", ret); 796 return -1; 797 } 798 if (data.num_pmkid == 1 && data.pmkid) 799 parse->rsn_pmkid = data.pmkid; 800 break; 801 case WLAN_EID_MOBILITY_DOMAIN: 802 parse->mdie = pos + 2; 803 parse->mdie_len = pos[1]; 804 break; 805 case WLAN_EID_FAST_BSS_TRANSITION: 806 if (pos[1] < sizeof(*ftie)) 807 return -1; 808 ftie = (const struct rsn_ftie *) (pos + 2); 809 prot_ie_count = ftie->mic_control[1]; 810 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0) 811 return -1; 812 break; 813 case WLAN_EID_RIC_DATA: 814 if (parse->ric == NULL) 815 parse->ric = pos; 816 } 817 818 pos += 2 + pos[1]; 819 } 820 821 if (prot_ie_count == 0) 822 return 0; /* no MIC */ 823 824 /* 825 * Check that the protected IE count matches with IEs included in the 826 * frame. 827 */ 828 if (parse->rsn) 829 prot_ie_count--; 830 if (parse->mdie) 831 prot_ie_count--; 832 if (parse->ftie) 833 prot_ie_count--; 834 if (prot_ie_count < 0) { 835 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in " 836 "the protected IE count"); 837 return -1; 838 } 839 840 if (prot_ie_count == 0 && parse->ric) { 841 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not " 842 "included in protected IE count"); 843 return -1; 844 } 845 846 /* Determine the end of the RIC IE(s) */ 847 pos = parse->ric; 848 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end && 849 prot_ie_count) { 850 prot_ie_count--; 851 pos += 2 + pos[1]; 852 } 853 parse->ric_len = pos - parse->ric; 854 if (prot_ie_count) { 855 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from " 856 "frame", (int) prot_ie_count); 857 return -1; 858 } 859 860 return 0; 861 } 862 863 864 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 865 int vlan_id, 866 enum wpa_alg alg, const u8 *addr, int idx, 867 u8 *key, size_t key_len) 868 { 869 if (wpa_auth->cb.set_key == NULL) 870 return -1; 871 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 872 key, key_len); 873 } 874 875 876 void wpa_ft_install_ptk(struct wpa_state_machine *sm) 877 { 878 enum wpa_alg alg; 879 int klen; 880 881 /* MLME-SETKEYS.request(PTK) */ 882 if (sm->pairwise == WPA_CIPHER_TKIP) { 883 alg = WPA_ALG_TKIP; 884 klen = 32; 885 } else if (sm->pairwise == WPA_CIPHER_CCMP) { 886 alg = WPA_ALG_CCMP; 887 klen = 16; 888 } else { 889 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 890 "PTK configuration", sm->pairwise); 891 return; 892 } 893 894 /* FIX: add STA entry to kernel/driver here? The set_key will fail 895 * most likely without this.. At the moment, STA entry is added only 896 * after association has been completed. This function will be called 897 * again after association to get the PTK configured, but that could be 898 * optimized by adding the STA entry earlier. 899 */ 900 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 901 sm->PTK.tk1, klen)) 902 return; 903 904 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 905 sm->pairwise_set = TRUE; 906 } 907 908 909 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm, 910 const u8 *ies, size_t ies_len, 911 u8 **resp_ies, size_t *resp_ies_len) 912 { 913 struct rsn_mdie *mdie; 914 struct rsn_ftie *ftie; 915 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 916 u8 ptk_name[WPA_PMK_NAME_LEN]; 917 struct wpa_auth_config *conf; 918 struct wpa_ft_ies parse; 919 size_t buflen, ptk_len; 920 int ret; 921 u8 *pos, *end; 922 int pairwise; 923 924 *resp_ies = NULL; 925 *resp_ies_len = 0; 926 927 sm->pmk_r1_name_valid = 0; 928 conf = &sm->wpa_auth->conf; 929 930 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 931 ies, ies_len); 932 933 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 934 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 935 return WLAN_STATUS_UNSPECIFIED_FAILURE; 936 } 937 938 mdie = (struct rsn_mdie *) parse.mdie; 939 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 940 os_memcmp(mdie->mobility_domain, 941 sm->wpa_auth->conf.mobility_domain, 942 MOBILITY_DOMAIN_ID_LEN) != 0) { 943 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 944 return WLAN_STATUS_INVALID_MDIE; 945 } 946 947 ftie = (struct rsn_ftie *) parse.ftie; 948 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 949 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 950 return WLAN_STATUS_INVALID_FTIE; 951 } 952 953 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 954 955 if (parse.r0kh_id == NULL) { 956 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 957 return WLAN_STATUS_INVALID_FTIE; 958 } 959 960 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 961 parse.r0kh_id, parse.r0kh_id_len); 962 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 963 sm->r0kh_id_len = parse.r0kh_id_len; 964 965 if (parse.rsn_pmkid == NULL) { 966 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 967 return WLAN_STATUS_INVALID_PMKID; 968 } 969 970 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 971 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 972 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 973 sm->wpa_auth->conf.r1_key_holder, sm->addr, 974 pmk_r1_name); 975 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 976 pmk_r1_name, WPA_PMK_NAME_LEN); 977 978 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 979 &pairwise) < 0) { 980 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id, 981 sm->r0kh_id_len, parse.rsn_pmkid) < 0) { 982 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 983 "PMK-R1 and unknown R0KH-ID"); 984 return WLAN_STATUS_INVALID_PMKID; 985 } 986 987 /* 988 * TODO: Should return "status pending" (and the caller should 989 * not send out response now). The real response will be sent 990 * once the response from R0KH is received. 991 */ 992 return WLAN_STATUS_INVALID_PMKID; 993 } 994 995 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 996 sm->pmk_r1_name_valid = 1; 997 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 998 999 if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) { 1000 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 1001 "ANonce"); 1002 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1003 } 1004 1005 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1006 sm->SNonce, WPA_NONCE_LEN); 1007 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 1008 sm->ANonce, WPA_NONCE_LEN); 1009 1010 ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48; 1011 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 1012 sm->wpa_auth->addr, pmk_r1_name, 1013 (u8 *) &sm->PTK, ptk_len, ptk_name); 1014 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 1015 (u8 *) &sm->PTK, ptk_len); 1016 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 1017 1018 sm->pairwise = pairwise; 1019 wpa_ft_install_ptk(sm); 1020 1021 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 1022 2 + FT_R1KH_ID_LEN + 200; 1023 *resp_ies = os_zalloc(buflen); 1024 if (*resp_ies == NULL) { 1025 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1026 } 1027 1028 pos = *resp_ies; 1029 end = *resp_ies + buflen; 1030 1031 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 1032 if (ret < 0) { 1033 os_free(*resp_ies); 1034 *resp_ies = NULL; 1035 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1036 } 1037 pos += ret; 1038 1039 ret = wpa_write_mdie(conf, pos, end - pos); 1040 if (ret < 0) { 1041 os_free(*resp_ies); 1042 *resp_ies = NULL; 1043 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1044 } 1045 pos += ret; 1046 1047 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 1048 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 1049 if (ret < 0) { 1050 os_free(*resp_ies); 1051 *resp_ies = NULL; 1052 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1053 } 1054 pos += ret; 1055 1056 *resp_ies_len = pos - *resp_ies; 1057 1058 return WLAN_STATUS_SUCCESS; 1059 } 1060 1061 1062 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 1063 u16 auth_transaction, const u8 *ies, size_t ies_len, 1064 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 1065 u16 auth_transaction, u16 status, 1066 const u8 *ies, size_t ies_len), 1067 void *ctx) 1068 { 1069 u16 status; 1070 u8 *resp_ies; 1071 size_t resp_ies_len; 1072 1073 if (sm == NULL) { 1074 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 1075 "WPA SM not available"); 1076 return; 1077 } 1078 1079 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 1080 " BSSID=" MACSTR " transaction=%d", 1081 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 1082 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 1083 &resp_ies_len); 1084 1085 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 1086 " auth_transaction=%d status=%d", 1087 MAC2STR(sm->addr), auth_transaction + 1, status); 1088 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1089 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 1090 resp_ies, resp_ies_len); 1091 os_free(resp_ies); 1092 } 1093 1094 1095 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 1096 size_t ies_len) 1097 { 1098 struct wpa_ft_ies parse; 1099 struct rsn_mdie *mdie; 1100 struct rsn_ftie *ftie; 1101 u8 mic[16]; 1102 unsigned int count; 1103 1104 if (sm == NULL) 1105 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1106 1107 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 1108 1109 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1110 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1111 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1112 } 1113 1114 if (parse.rsn == NULL) { 1115 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1116 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1117 } 1118 1119 if (parse.rsn_pmkid == NULL) { 1120 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1121 return WLAN_STATUS_INVALID_PMKID; 1122 } 1123 1124 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) 1125 { 1126 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1127 "with the PMKR1Name derived from auth request"); 1128 return WLAN_STATUS_INVALID_PMKID; 1129 } 1130 1131 mdie = (struct rsn_mdie *) parse.mdie; 1132 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1133 os_memcmp(mdie->mobility_domain, 1134 sm->wpa_auth->conf.mobility_domain, 1135 MOBILITY_DOMAIN_ID_LEN) != 0) { 1136 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1137 return WLAN_STATUS_INVALID_MDIE; 1138 } 1139 1140 ftie = (struct rsn_ftie *) parse.ftie; 1141 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1142 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1143 return WLAN_STATUS_INVALID_FTIE; 1144 } 1145 1146 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1147 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1148 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1149 ftie->snonce, WPA_NONCE_LEN); 1150 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1151 sm->SNonce, WPA_NONCE_LEN); 1152 return -1; 1153 } 1154 1155 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1156 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1157 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1158 ftie->anonce, WPA_NONCE_LEN); 1159 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1160 sm->ANonce, WPA_NONCE_LEN); 1161 return -1; 1162 } 1163 1164 1165 if (parse.r0kh_id == NULL) { 1166 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1167 return -1; 1168 } 1169 1170 if (parse.r0kh_id_len != sm->r0kh_id_len || 1171 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 1172 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1173 "the current R0KH-ID"); 1174 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1175 parse.r0kh_id, parse.r0kh_id_len); 1176 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1177 sm->r0kh_id, sm->r0kh_id_len); 1178 return -1; 1179 } 1180 1181 if (parse.r1kh_id == NULL) { 1182 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1183 return -1; 1184 } 1185 1186 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1187 FT_R1KH_ID_LEN) != 0) { 1188 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1189 "ReassocReq"); 1190 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1191 parse.r1kh_id, FT_R1KH_ID_LEN); 1192 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1193 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1194 return -1; 1195 } 1196 1197 if (parse.rsn_pmkid == NULL || 1198 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 1199 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1200 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1201 return -1; 1202 } 1203 1204 count = 3; 1205 if (parse.ric) 1206 count++; 1207 if (ftie->mic_control[1] != count) { 1208 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1209 "Control: received %u expected %u", 1210 ftie->mic_control[1], count); 1211 return -1; 1212 } 1213 1214 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5, 1215 parse.mdie - 2, parse.mdie_len + 2, 1216 parse.ftie - 2, parse.ftie_len + 2, 1217 parse.rsn - 2, parse.rsn_len + 2, 1218 parse.ric, parse.ric_len, 1219 mic) < 0) { 1220 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1221 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1222 } 1223 1224 if (os_memcmp(mic, ftie->mic, 16) != 0) { 1225 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1226 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 1227 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 1228 return WLAN_STATUS_INVALID_FTIE; 1229 } 1230 1231 return WLAN_STATUS_SUCCESS; 1232 } 1233 1234 1235 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1236 { 1237 const u8 *sta_addr, *target_ap; 1238 const u8 *ies; 1239 size_t ies_len; 1240 u8 action; 1241 struct ft_rrb_frame *frame; 1242 1243 if (sm == NULL) 1244 return -1; 1245 1246 /* 1247 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1248 * FT Request action frame body[variable] 1249 */ 1250 1251 if (len < 14) { 1252 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1253 "(len=%lu)", (unsigned long) len); 1254 return -1; 1255 } 1256 1257 action = data[1]; 1258 sta_addr = data + 2; 1259 target_ap = data + 8; 1260 ies = data + 14; 1261 ies_len = len - 14; 1262 1263 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1264 " Target AP=" MACSTR " Action=%d)", 1265 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1266 1267 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1268 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1269 "STA=" MACSTR " STA-Address=" MACSTR, 1270 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1271 return -1; 1272 } 1273 1274 /* 1275 * Do some sanity checking on the target AP address (not own and not 1276 * broadcast. This could be extended to filter based on a list of known 1277 * APs in the MD (if such a list were configured). 1278 */ 1279 if ((target_ap[0] & 0x01) || 1280 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1281 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1282 "frame"); 1283 return -1; 1284 } 1285 1286 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1287 1288 /* RRB - Forward action frame to the target AP */ 1289 frame = os_malloc(sizeof(*frame) + len); 1290 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1291 frame->packet_type = FT_PACKET_REQUEST; 1292 frame->action_length = host_to_le16(len); 1293 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1294 os_memcpy(frame + 1, data, len); 1295 1296 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1297 sizeof(*frame) + len); 1298 os_free(frame); 1299 1300 return 0; 1301 } 1302 1303 1304 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1305 const u8 *current_ap, const u8 *sta_addr, 1306 const u8 *body, size_t len) 1307 { 1308 struct wpa_state_machine *sm; 1309 u16 status; 1310 u8 *resp_ies, *pos; 1311 size_t resp_ies_len, rlen; 1312 struct ft_rrb_frame *frame; 1313 1314 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1315 if (sm == NULL) { 1316 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1317 "RRB Request"); 1318 return -1; 1319 } 1320 1321 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1322 1323 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1324 &resp_ies_len); 1325 1326 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1327 " CurrentAP=" MACSTR " status=%d", 1328 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1329 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1330 1331 /* RRB - Forward action frame response to the Current AP */ 1332 1333 /* 1334 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1335 * Status_Code[2] FT Request action frame body[variable] 1336 */ 1337 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1338 1339 frame = os_malloc(sizeof(*frame) + rlen); 1340 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1341 frame->packet_type = FT_PACKET_RESPONSE; 1342 frame->action_length = host_to_le16(rlen); 1343 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1344 pos = (u8 *) (frame + 1); 1345 *pos++ = WLAN_ACTION_FT; 1346 *pos++ = 2; /* Action: Response */ 1347 os_memcpy(pos, sta_addr, ETH_ALEN); 1348 pos += ETH_ALEN; 1349 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1350 pos += ETH_ALEN; 1351 WPA_PUT_LE16(pos, status); 1352 pos += 2; 1353 if (resp_ies) { 1354 os_memcpy(pos, resp_ies, resp_ies_len); 1355 os_free(resp_ies); 1356 } 1357 1358 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1359 sizeof(*frame) + rlen); 1360 os_free(frame); 1361 1362 return 0; 1363 } 1364 1365 1366 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1367 const u8 *src_addr, 1368 const u8 *data, size_t data_len) 1369 { 1370 struct ft_r0kh_r1kh_pull_frame *frame, f; 1371 struct ft_remote_r1kh *r1kh; 1372 struct ft_r0kh_r1kh_resp_frame resp, r; 1373 u8 pmk_r0[PMK_LEN]; 1374 int pairwise; 1375 1376 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1377 1378 if (data_len < sizeof(*frame)) 1379 return -1; 1380 1381 r1kh = wpa_auth->conf.r1kh_list; 1382 while (r1kh) { 1383 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1384 break; 1385 r1kh = r1kh->next; 1386 } 1387 if (r1kh == NULL) { 1388 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1389 "PMK-R1 pull source address " MACSTR, 1390 MAC2STR(src_addr)); 1391 return -1; 1392 } 1393 1394 frame = (struct ft_r0kh_r1kh_pull_frame *) data; 1395 /* aes_unwrap() does not support inplace decryption, so use a temporary 1396 * buffer for the data. */ 1397 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1398 frame->nonce, f.nonce) < 0) { 1399 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1400 "request from " MACSTR, MAC2STR(src_addr)); 1401 return -1; 1402 } 1403 1404 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1405 f.nonce, sizeof(f.nonce)); 1406 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1407 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1408 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" 1409 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1410 1411 os_memset(&resp, 0, sizeof(resp)); 1412 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1413 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1414 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1415 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1416 1417 /* aes_wrap() does not support inplace encryption, so use a temporary 1418 * buffer for the data. */ 1419 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1420 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1421 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1422 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1423 &pairwise) < 0) { 1424 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1425 "PMK-R1 pull"); 1426 return -1; 1427 } 1428 1429 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1430 r.pmk_r1, r.pmk_r1_name); 1431 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1432 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1433 WPA_PMK_NAME_LEN); 1434 r.pairwise = pairwise; 1435 1436 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1437 r.nonce, resp.nonce) < 0) { 1438 os_memset(pmk_r0, 0, PMK_LEN); 1439 return -1; 1440 } 1441 1442 os_memset(pmk_r0, 0, PMK_LEN); 1443 1444 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1445 1446 return 0; 1447 } 1448 1449 1450 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1451 const u8 *src_addr, 1452 const u8 *data, size_t data_len) 1453 { 1454 struct ft_r0kh_r1kh_resp_frame *frame, f; 1455 struct ft_remote_r0kh *r0kh; 1456 int pairwise; 1457 1458 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1459 1460 if (data_len < sizeof(*frame)) 1461 return -1; 1462 1463 r0kh = wpa_auth->conf.r0kh_list; 1464 while (r0kh) { 1465 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1466 break; 1467 r0kh = r0kh->next; 1468 } 1469 if (r0kh == NULL) { 1470 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1471 "PMK-R0 pull response source address " MACSTR, 1472 MAC2STR(src_addr)); 1473 return -1; 1474 } 1475 1476 frame = (struct ft_r0kh_r1kh_resp_frame *) data; 1477 /* aes_unwrap() does not support inplace decryption, so use a temporary 1478 * buffer for the data. */ 1479 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1480 frame->nonce, f.nonce) < 0) { 1481 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1482 "response from " MACSTR, MAC2STR(src_addr)); 1483 return -1; 1484 } 1485 1486 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1487 != 0) { 1488 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1489 "matching R1KH-ID"); 1490 return -1; 1491 } 1492 1493 /* TODO: verify that <nonce,s1kh_id> matches with a pending request 1494 * and call this requests callback function to finish request 1495 * processing */ 1496 1497 pairwise = le_to_host16(f.pairwise); 1498 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1499 f.nonce, sizeof(f.nonce)); 1500 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" 1501 MACSTR " pairwise=0x%x", 1502 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1503 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1504 f.pmk_r1, PMK_LEN); 1505 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1506 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1507 1508 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1509 pairwise); 1510 os_memset(f.pmk_r1, 0, PMK_LEN); 1511 1512 return 0; 1513 } 1514 1515 1516 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1517 const u8 *src_addr, 1518 const u8 *data, size_t data_len) 1519 { 1520 struct ft_r0kh_r1kh_push_frame *frame, f; 1521 struct ft_remote_r0kh *r0kh; 1522 struct os_time now; 1523 os_time_t tsend; 1524 int pairwise; 1525 1526 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1527 1528 if (data_len < sizeof(*frame)) 1529 return -1; 1530 1531 r0kh = wpa_auth->conf.r0kh_list; 1532 while (r0kh) { 1533 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1534 break; 1535 r0kh = r0kh->next; 1536 } 1537 if (r0kh == NULL) { 1538 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1539 "PMK-R0 push source address " MACSTR, 1540 MAC2STR(src_addr)); 1541 return -1; 1542 } 1543 1544 frame = (struct ft_r0kh_r1kh_push_frame *) data; 1545 /* aes_unwrap() does not support inplace decryption, so use a temporary 1546 * buffer for the data. */ 1547 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1548 frame->timestamp, f.timestamp) < 0) { 1549 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1550 MACSTR, MAC2STR(src_addr)); 1551 return -1; 1552 } 1553 1554 os_get_time(&now); 1555 tsend = WPA_GET_LE32(f.timestamp); 1556 if ((now.sec > tsend && now.sec - tsend > 60) || 1557 (now.sec < tsend && tsend - now.sec > 60)) { 1558 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1559 "timestamp: sender time %d own time %d\n", 1560 (int) tsend, (int) now.sec); 1561 return -1; 1562 } 1563 1564 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1565 != 0) { 1566 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1567 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1568 MAC2STR(f.r1kh_id), 1569 MAC2STR(wpa_auth->conf.r1_key_holder)); 1570 return -1; 1571 } 1572 1573 pairwise = le_to_host16(f.pairwise); 1574 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1575 MACSTR " pairwise=0x%x", 1576 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1577 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1578 f.pmk_r1, PMK_LEN); 1579 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1580 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1581 1582 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1583 pairwise); 1584 os_memset(f.pmk_r1, 0, PMK_LEN); 1585 1586 return 0; 1587 } 1588 1589 1590 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1591 const u8 *data, size_t data_len) 1592 { 1593 struct ft_rrb_frame *frame; 1594 u16 alen; 1595 const u8 *pos, *end, *start; 1596 u8 action; 1597 const u8 *sta_addr, *target_ap_addr; 1598 1599 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1600 MAC2STR(src_addr)); 1601 1602 if (data_len < sizeof(*frame)) { 1603 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1604 (unsigned long) data_len); 1605 return -1; 1606 } 1607 1608 pos = data; 1609 frame = (struct ft_rrb_frame *) pos; 1610 pos += sizeof(*frame); 1611 1612 alen = le_to_host16(frame->action_length); 1613 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1614 "action_length=%d ap_address=" MACSTR, 1615 frame->frame_type, frame->packet_type, alen, 1616 MAC2STR(frame->ap_address)); 1617 1618 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1619 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1620 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1621 "unrecognized type %d", frame->frame_type); 1622 return -1; 1623 } 1624 1625 if (alen > data_len - sizeof(*frame)) { 1626 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1627 "frame"); 1628 return -1; 1629 } 1630 1631 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1632 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1633 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1634 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1635 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1636 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1637 1638 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1639 1640 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1641 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1642 "room for Action Frame body); alen=%lu", 1643 (unsigned long) alen); 1644 return -1; 1645 } 1646 start = pos; 1647 end = pos + alen; 1648 1649 if (*pos != WLAN_ACTION_FT) { 1650 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1651 "%d", *pos); 1652 return -1; 1653 } 1654 1655 pos++; 1656 action = *pos++; 1657 sta_addr = pos; 1658 pos += ETH_ALEN; 1659 target_ap_addr = pos; 1660 pos += ETH_ALEN; 1661 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1662 MACSTR " target_ap_addr=" MACSTR, 1663 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1664 1665 if (frame->packet_type == FT_PACKET_REQUEST) { 1666 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1667 1668 if (action != 1) { 1669 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1670 "RRB Request", action); 1671 return -1; 1672 } 1673 1674 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1675 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1676 "RRB Request does not match with own " 1677 "address"); 1678 return -1; 1679 } 1680 1681 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1682 sta_addr, pos, end - pos) < 0) 1683 return -1; 1684 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1685 u16 status_code; 1686 1687 if (end - pos < 2) { 1688 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1689 "code in RRB Response"); 1690 return -1; 1691 } 1692 status_code = WPA_GET_LE16(pos); 1693 pos += 2; 1694 1695 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1696 "(status_code=%d)", status_code); 1697 1698 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1699 return -1; 1700 } else { 1701 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1702 "packet_type %d", frame->packet_type); 1703 return -1; 1704 } 1705 1706 return 0; 1707 } 1708 1709 1710 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1711 struct wpa_ft_pmk_r0_sa *pmk_r0, 1712 struct ft_remote_r1kh *r1kh, 1713 const u8 *s1kh_id, int pairwise) 1714 { 1715 struct ft_r0kh_r1kh_push_frame frame, f; 1716 struct os_time now; 1717 1718 os_memset(&frame, 0, sizeof(frame)); 1719 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1720 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1721 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1722 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1723 1724 /* aes_wrap() does not support inplace encryption, so use a temporary 1725 * buffer for the data. */ 1726 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1727 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1728 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1729 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1730 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1731 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1732 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1733 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1734 WPA_PMK_NAME_LEN); 1735 os_get_time(&now); 1736 WPA_PUT_LE32(f.timestamp, now.sec); 1737 f.pairwise = pairwise; 1738 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1739 f.timestamp, frame.timestamp) < 0) 1740 return; 1741 1742 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1743 } 1744 1745 1746 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1747 { 1748 struct wpa_ft_pmk_r0_sa *r0; 1749 struct ft_remote_r1kh *r1kh; 1750 1751 if (!wpa_auth->conf.pmk_r1_push) 1752 return; 1753 1754 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1755 while (r0) { 1756 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1757 break; 1758 r0 = r0->next; 1759 } 1760 1761 if (r0 == NULL || r0->pmk_r1_pushed) 1762 return; 1763 r0->pmk_r1_pushed = 1; 1764 1765 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1766 "for STA " MACSTR, MAC2STR(addr)); 1767 1768 r1kh = wpa_auth->conf.r1kh_list; 1769 while (r1kh) { 1770 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1771 r1kh = r1kh->next; 1772 } 1773 } 1774 1775 #endif /* CONFIG_IEEE80211R */ 1776