1 /* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "common/ieee802_11_defs.h" 13 #include "common/ieee802_11_common.h" 14 #include "crypto/aes_wrap.h" 15 #include "crypto/random.h" 16 #include "ap_config.h" 17 #include "ieee802_11.h" 18 #include "wmm.h" 19 #include "wpa_auth.h" 20 #include "wpa_auth_i.h" 21 22 23 #ifdef CONFIG_IEEE80211R 24 25 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, 26 const u8 *data, size_t data_len) 27 { 28 if (wpa_auth->cb.send_ether == NULL) 29 return -1; 30 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst)); 31 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB, 32 data, data_len); 33 } 34 35 36 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, 37 const u8 *dst, const u8 *data, size_t data_len) 38 { 39 if (wpa_auth->cb.send_ft_action == NULL) 40 return -1; 41 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst, 42 data, data_len); 43 } 44 45 46 static struct wpa_state_machine * 47 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) 48 { 49 if (wpa_auth->cb.add_sta == NULL) 50 return NULL; 51 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr); 52 } 53 54 55 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth, 56 const u8 *sta_addr, 57 u8 *tspec_ie, size_t tspec_ielen) 58 { 59 if (wpa_auth->cb.add_tspec == NULL) { 60 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized"); 61 return -1; 62 } 63 return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie, 64 tspec_ielen); 65 } 66 67 68 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) 69 { 70 u8 *pos = buf; 71 u8 capab; 72 if (len < 2 + sizeof(struct rsn_mdie)) 73 return -1; 74 75 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 76 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; 77 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 78 pos += MOBILITY_DOMAIN_ID_LEN; 79 capab = 0; 80 if (conf->ft_over_ds) 81 capab |= RSN_FT_CAPAB_FT_OVER_DS; 82 *pos++ = capab; 83 84 return pos - buf; 85 } 86 87 88 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, 89 size_t r0kh_id_len, 90 const u8 *anonce, const u8 *snonce, 91 u8 *buf, size_t len, const u8 *subelem, 92 size_t subelem_len) 93 { 94 u8 *pos = buf, *ielen; 95 struct rsn_ftie *hdr; 96 97 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + 98 subelem_len) 99 return -1; 100 101 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 102 ielen = pos++; 103 104 hdr = (struct rsn_ftie *) pos; 105 os_memset(hdr, 0, sizeof(*hdr)); 106 pos += sizeof(*hdr); 107 WPA_PUT_LE16(hdr->mic_control, 0); 108 if (anonce) 109 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); 110 if (snonce) 111 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); 112 113 /* Optional Parameters */ 114 *pos++ = FTIE_SUBELEM_R1KH_ID; 115 *pos++ = FT_R1KH_ID_LEN; 116 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); 117 pos += FT_R1KH_ID_LEN; 118 119 if (r0kh_id) { 120 *pos++ = FTIE_SUBELEM_R0KH_ID; 121 *pos++ = r0kh_id_len; 122 os_memcpy(pos, r0kh_id, r0kh_id_len); 123 pos += r0kh_id_len; 124 } 125 126 if (subelem) { 127 os_memcpy(pos, subelem, subelem_len); 128 pos += subelem_len; 129 } 130 131 *ielen = pos - buf - 2; 132 133 return pos - buf; 134 } 135 136 137 struct wpa_ft_pmk_r0_sa { 138 struct wpa_ft_pmk_r0_sa *next; 139 u8 pmk_r0[PMK_LEN]; 140 u8 pmk_r0_name[WPA_PMK_NAME_LEN]; 141 u8 spa[ETH_ALEN]; 142 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 143 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 144 int pmk_r1_pushed; 145 }; 146 147 struct wpa_ft_pmk_r1_sa { 148 struct wpa_ft_pmk_r1_sa *next; 149 u8 pmk_r1[PMK_LEN]; 150 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 151 u8 spa[ETH_ALEN]; 152 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 153 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 154 }; 155 156 struct wpa_ft_pmk_cache { 157 struct wpa_ft_pmk_r0_sa *pmk_r0; 158 struct wpa_ft_pmk_r1_sa *pmk_r1; 159 }; 160 161 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) 162 { 163 struct wpa_ft_pmk_cache *cache; 164 165 cache = os_zalloc(sizeof(*cache)); 166 167 return cache; 168 } 169 170 171 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) 172 { 173 struct wpa_ft_pmk_r0_sa *r0, *r0prev; 174 struct wpa_ft_pmk_r1_sa *r1, *r1prev; 175 176 r0 = cache->pmk_r0; 177 while (r0) { 178 r0prev = r0; 179 r0 = r0->next; 180 os_memset(r0prev->pmk_r0, 0, PMK_LEN); 181 os_free(r0prev); 182 } 183 184 r1 = cache->pmk_r1; 185 while (r1) { 186 r1prev = r1; 187 r1 = r1->next; 188 os_memset(r1prev->pmk_r1, 0, PMK_LEN); 189 os_free(r1prev); 190 } 191 192 os_free(cache); 193 } 194 195 196 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, 197 const u8 *spa, const u8 *pmk_r0, 198 const u8 *pmk_r0_name, int pairwise) 199 { 200 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 201 struct wpa_ft_pmk_r0_sa *r0; 202 203 /* TODO: add expiration and limit on number of entries in cache */ 204 205 r0 = os_zalloc(sizeof(*r0)); 206 if (r0 == NULL) 207 return -1; 208 209 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); 210 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 211 os_memcpy(r0->spa, spa, ETH_ALEN); 212 r0->pairwise = pairwise; 213 214 r0->next = cache->pmk_r0; 215 cache->pmk_r0 = r0; 216 217 return 0; 218 } 219 220 221 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, 222 const u8 *spa, const u8 *pmk_r0_name, 223 u8 *pmk_r0, int *pairwise) 224 { 225 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 226 struct wpa_ft_pmk_r0_sa *r0; 227 228 r0 = cache->pmk_r0; 229 while (r0) { 230 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && 231 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN) 232 == 0) { 233 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); 234 if (pairwise) 235 *pairwise = r0->pairwise; 236 return 0; 237 } 238 239 r0 = r0->next; 240 } 241 242 return -1; 243 } 244 245 246 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, 247 const u8 *spa, const u8 *pmk_r1, 248 const u8 *pmk_r1_name, int pairwise) 249 { 250 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 251 struct wpa_ft_pmk_r1_sa *r1; 252 253 /* TODO: add expiration and limit on number of entries in cache */ 254 255 r1 = os_zalloc(sizeof(*r1)); 256 if (r1 == NULL) 257 return -1; 258 259 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); 260 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 261 os_memcpy(r1->spa, spa, ETH_ALEN); 262 r1->pairwise = pairwise; 263 264 r1->next = cache->pmk_r1; 265 cache->pmk_r1 = r1; 266 267 return 0; 268 } 269 270 271 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, 272 const u8 *spa, const u8 *pmk_r1_name, 273 u8 *pmk_r1, int *pairwise) 274 { 275 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 276 struct wpa_ft_pmk_r1_sa *r1; 277 278 r1 = cache->pmk_r1; 279 while (r1) { 280 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && 281 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN) 282 == 0) { 283 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); 284 if (pairwise) 285 *pairwise = r1->pairwise; 286 return 0; 287 } 288 289 r1 = r1->next; 290 } 291 292 return -1; 293 } 294 295 296 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth, 297 const u8 *s1kh_id, const u8 *r0kh_id, 298 size_t r0kh_id_len, const u8 *pmk_r0_name) 299 { 300 struct ft_remote_r0kh *r0kh; 301 struct ft_r0kh_r1kh_pull_frame frame, f; 302 303 r0kh = wpa_auth->conf.r0kh_list; 304 while (r0kh) { 305 if (r0kh->id_len == r0kh_id_len && 306 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0) 307 break; 308 r0kh = r0kh->next; 309 } 310 if (r0kh == NULL) 311 return -1; 312 313 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 314 "address " MACSTR, MAC2STR(r0kh->addr)); 315 316 os_memset(&frame, 0, sizeof(frame)); 317 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 318 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 319 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 320 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 321 322 /* aes_wrap() does not support inplace encryption, so use a temporary 323 * buffer for the data. */ 324 if (random_get_bytes(f.nonce, sizeof(f.nonce))) { 325 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 326 "nonce"); 327 return -1; 328 } 329 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 330 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 331 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 332 333 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 334 f.nonce, frame.nonce) < 0) 335 return -1; 336 337 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 338 339 return 0; 340 } 341 342 343 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 344 struct wpa_ptk *ptk, size_t ptk_len) 345 { 346 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 347 u8 pmk_r1[PMK_LEN]; 348 u8 ptk_name[WPA_PMK_NAME_LEN]; 349 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 350 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 351 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 352 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 353 const u8 *ssid = sm->wpa_auth->conf.ssid; 354 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 355 356 357 if (sm->xxkey_len == 0) { 358 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 359 "derivation"); 360 return -1; 361 } 362 363 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 364 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); 365 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 366 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 367 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 368 sm->pairwise); 369 370 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 371 pmk_r1, sm->pmk_r1_name); 372 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 373 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 374 WPA_PMK_NAME_LEN); 375 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name, 376 sm->pairwise); 377 378 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 379 sm->wpa_auth->addr, sm->pmk_r1_name, 380 (u8 *) ptk, ptk_len, ptk_name); 381 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); 382 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 383 384 return 0; 385 } 386 387 388 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 389 const u8 *addr, int idx, u8 *seq) 390 { 391 if (wpa_auth->cb.get_seqnum == NULL) 392 return -1; 393 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 394 } 395 396 397 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 398 { 399 u8 *subelem; 400 struct wpa_group *gsm = sm->group; 401 size_t subelem_len, pad_len; 402 const u8 *key; 403 size_t key_len; 404 u8 keybuf[32]; 405 406 key_len = gsm->GTK_len; 407 if (key_len > sizeof(keybuf)) 408 return NULL; 409 410 /* 411 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 412 * than 16 bytes. 413 */ 414 pad_len = key_len % 8; 415 if (pad_len) 416 pad_len = 8 - pad_len; 417 if (key_len + pad_len < 16) 418 pad_len += 8; 419 if (pad_len) { 420 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 421 os_memset(keybuf + key_len, 0, pad_len); 422 keybuf[key_len] = 0xdd; 423 key_len += pad_len; 424 key = keybuf; 425 } else 426 key = gsm->GTK[gsm->GN - 1]; 427 428 /* 429 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 430 * Key[5..32]. 431 */ 432 subelem_len = 13 + key_len + 8; 433 subelem = os_zalloc(subelem_len); 434 if (subelem == NULL) 435 return NULL; 436 437 subelem[0] = FTIE_SUBELEM_GTK; 438 subelem[1] = 11 + key_len + 8; 439 /* Key ID in B0-B1 of Key Info */ 440 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 441 subelem[4] = gsm->GTK_len; 442 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 443 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) { 444 os_free(subelem); 445 return NULL; 446 } 447 448 *len = subelem_len; 449 return subelem; 450 } 451 452 453 #ifdef CONFIG_IEEE80211W 454 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 455 { 456 u8 *subelem, *pos; 457 struct wpa_group *gsm = sm->group; 458 size_t subelem_len; 459 460 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 461 * Key[16+8] */ 462 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 463 subelem = os_zalloc(subelem_len); 464 if (subelem == NULL) 465 return NULL; 466 467 pos = subelem; 468 *pos++ = FTIE_SUBELEM_IGTK; 469 *pos++ = subelem_len - 2; 470 WPA_PUT_LE16(pos, gsm->GN_igtk); 471 pos += 2; 472 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 473 pos += 6; 474 *pos++ = WPA_IGTK_LEN; 475 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, 476 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 477 os_free(subelem); 478 return NULL; 479 } 480 481 *len = subelem_len; 482 return subelem; 483 } 484 #endif /* CONFIG_IEEE80211W */ 485 486 487 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm, 488 u8 *pos, u8 *end, u8 id, u8 descr_count, 489 const u8 *ies, size_t ies_len) 490 { 491 struct ieee802_11_elems parse; 492 struct rsn_rdie *rdie; 493 494 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 495 id, descr_count); 496 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 497 ies, ies_len); 498 499 if (end - pos < (int) sizeof(*rdie)) { 500 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 501 return pos; 502 } 503 504 *pos++ = WLAN_EID_RIC_DATA; 505 *pos++ = sizeof(*rdie); 506 rdie = (struct rsn_rdie *) pos; 507 rdie->id = id; 508 rdie->descr_count = 0; 509 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 510 pos += sizeof(*rdie); 511 512 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 513 ParseFailed) { 514 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 515 rdie->status_code = 516 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 517 return pos; 518 } 519 520 #ifdef NEED_AP_MLME 521 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { 522 struct wmm_tspec_element *tspec; 523 int res; 524 525 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 526 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 527 "(%d)", (int) parse.wmm_tspec_len); 528 rdie->status_code = 529 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 530 return pos; 531 } 532 if (end - pos < (int) sizeof(*tspec)) { 533 wpa_printf(MSG_ERROR, "FT: Not enough room for " 534 "response TSPEC"); 535 rdie->status_code = 536 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 537 return pos; 538 } 539 tspec = (struct wmm_tspec_element *) pos; 540 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 541 res = wmm_process_tspec(tspec); 542 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 543 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 544 rdie->status_code = 545 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 546 else if (res == WMM_ADDTS_STATUS_REFUSED) 547 rdie->status_code = 548 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 549 else { 550 /* TSPEC accepted; include updated TSPEC in response */ 551 rdie->descr_count = 1; 552 pos += sizeof(*tspec); 553 } 554 return pos; 555 } 556 #endif /* NEED_AP_MLME */ 557 558 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { 559 struct wmm_tspec_element *tspec; 560 int res; 561 562 tspec = (struct wmm_tspec_element *) pos; 563 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 564 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, 565 sizeof(*tspec)); 566 if (res >= 0) { 567 if (res) 568 rdie->status_code = host_to_le16(res); 569 else { 570 /* TSPEC accepted; include updated TSPEC in 571 * response */ 572 rdie->descr_count = 1; 573 pos += sizeof(*tspec); 574 } 575 return pos; 576 } 577 } 578 579 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 580 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 581 return pos; 582 } 583 584 585 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, 586 const u8 *ric, size_t ric_len) 587 { 588 const u8 *rpos, *start; 589 const struct rsn_rdie *rdie; 590 591 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 592 593 rpos = ric; 594 while (rpos + sizeof(*rdie) < ric + ric_len) { 595 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 596 rpos + 2 + rpos[1] > ric + ric_len) 597 break; 598 rdie = (const struct rsn_rdie *) (rpos + 2); 599 rpos += 2 + rpos[1]; 600 start = rpos; 601 602 while (rpos + 2 <= ric + ric_len && 603 rpos + 2 + rpos[1] <= ric + ric_len) { 604 if (rpos[0] == WLAN_EID_RIC_DATA) 605 break; 606 rpos += 2 + rpos[1]; 607 } 608 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, 609 rdie->descr_count, 610 start, rpos - start); 611 } 612 613 return pos; 614 } 615 616 617 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 618 size_t max_len, int auth_alg, 619 const u8 *req_ies, size_t req_ies_len) 620 { 621 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 622 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 623 int res; 624 struct wpa_auth_config *conf; 625 struct rsn_ftie *_ftie; 626 struct wpa_ft_ies parse; 627 u8 *ric_start; 628 u8 *anonce, *snonce; 629 630 if (sm == NULL) 631 return pos; 632 633 conf = &sm->wpa_auth->conf; 634 635 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 636 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK) 637 return pos; 638 639 end = pos + max_len; 640 641 if (auth_alg == WLAN_AUTH_FT) { 642 /* 643 * RSN (only present if this is a Reassociation Response and 644 * part of a fast BSS transition) 645 */ 646 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 647 if (res < 0) 648 return pos; 649 rsnie = pos; 650 rsnie_len = res; 651 pos += res; 652 } 653 654 /* Mobility Domain Information */ 655 res = wpa_write_mdie(conf, pos, end - pos); 656 if (res < 0) 657 return pos; 658 mdie = pos; 659 mdie_len = res; 660 pos += res; 661 662 /* Fast BSS Transition Information */ 663 if (auth_alg == WLAN_AUTH_FT) { 664 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 665 r0kh_id = sm->r0kh_id; 666 r0kh_id_len = sm->r0kh_id_len; 667 anonce = sm->ANonce; 668 snonce = sm->SNonce; 669 #ifdef CONFIG_IEEE80211W 670 if (sm->mgmt_frame_prot) { 671 u8 *igtk; 672 size_t igtk_len; 673 u8 *nbuf; 674 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 675 if (igtk == NULL) { 676 os_free(subelem); 677 return pos; 678 } 679 nbuf = os_realloc(subelem, subelem_len + igtk_len); 680 if (nbuf == NULL) { 681 os_free(subelem); 682 os_free(igtk); 683 return pos; 684 } 685 subelem = nbuf; 686 os_memcpy(subelem + subelem_len, igtk, igtk_len); 687 subelem_len += igtk_len; 688 os_free(igtk); 689 } 690 #endif /* CONFIG_IEEE80211W */ 691 } else { 692 r0kh_id = conf->r0_key_holder; 693 r0kh_id_len = conf->r0_key_holder_len; 694 anonce = NULL; 695 snonce = NULL; 696 } 697 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 698 end - pos, subelem, subelem_len); 699 os_free(subelem); 700 if (res < 0) 701 return pos; 702 ftie = pos; 703 ftie_len = res; 704 pos += res; 705 706 os_free(sm->assoc_resp_ftie); 707 sm->assoc_resp_ftie = os_malloc(ftie_len); 708 if (sm->assoc_resp_ftie) 709 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 710 711 _ftie = (struct rsn_ftie *) (ftie + 2); 712 if (auth_alg == WLAN_AUTH_FT) 713 _ftie->mic_control[1] = 3; /* Information element count */ 714 715 ric_start = pos; 716 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 717 pos = wpa_ft_process_ric(sm, pos, end, parse.ric, 718 parse.ric_len); 719 if (auth_alg == WLAN_AUTH_FT) 720 _ftie->mic_control[1] += 721 ieee802_11_ie_count(ric_start, 722 pos - ric_start); 723 } 724 if (ric_start == pos) 725 ric_start = NULL; 726 727 if (auth_alg == WLAN_AUTH_FT && 728 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6, 729 mdie, mdie_len, ftie, ftie_len, 730 rsnie, rsnie_len, 731 ric_start, ric_start ? pos - ric_start : 0, 732 _ftie->mic) < 0) 733 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 734 735 return pos; 736 } 737 738 739 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 740 int vlan_id, 741 enum wpa_alg alg, const u8 *addr, int idx, 742 u8 *key, size_t key_len) 743 { 744 if (wpa_auth->cb.set_key == NULL) 745 return -1; 746 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 747 key, key_len); 748 } 749 750 751 void wpa_ft_install_ptk(struct wpa_state_machine *sm) 752 { 753 enum wpa_alg alg; 754 int klen; 755 756 /* MLME-SETKEYS.request(PTK) */ 757 alg = wpa_cipher_to_alg(sm->pairwise); 758 klen = wpa_cipher_key_len(sm->pairwise); 759 if (!wpa_cipher_valid_pairwise(sm->pairwise)) { 760 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 761 "PTK configuration", sm->pairwise); 762 return; 763 } 764 765 /* FIX: add STA entry to kernel/driver here? The set_key will fail 766 * most likely without this.. At the moment, STA entry is added only 767 * after association has been completed. This function will be called 768 * again after association to get the PTK configured, but that could be 769 * optimized by adding the STA entry earlier. 770 */ 771 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 772 sm->PTK.tk1, klen)) 773 return; 774 775 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 776 sm->pairwise_set = TRUE; 777 } 778 779 780 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm, 781 const u8 *ies, size_t ies_len, 782 u8 **resp_ies, size_t *resp_ies_len) 783 { 784 struct rsn_mdie *mdie; 785 struct rsn_ftie *ftie; 786 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 787 u8 ptk_name[WPA_PMK_NAME_LEN]; 788 struct wpa_auth_config *conf; 789 struct wpa_ft_ies parse; 790 size_t buflen, ptk_len; 791 int ret; 792 u8 *pos, *end; 793 int pairwise; 794 795 *resp_ies = NULL; 796 *resp_ies_len = 0; 797 798 sm->pmk_r1_name_valid = 0; 799 conf = &sm->wpa_auth->conf; 800 801 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 802 ies, ies_len); 803 804 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 805 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 806 return WLAN_STATUS_UNSPECIFIED_FAILURE; 807 } 808 809 mdie = (struct rsn_mdie *) parse.mdie; 810 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 811 os_memcmp(mdie->mobility_domain, 812 sm->wpa_auth->conf.mobility_domain, 813 MOBILITY_DOMAIN_ID_LEN) != 0) { 814 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 815 return WLAN_STATUS_INVALID_MDIE; 816 } 817 818 ftie = (struct rsn_ftie *) parse.ftie; 819 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 820 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 821 return WLAN_STATUS_INVALID_FTIE; 822 } 823 824 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 825 826 if (parse.r0kh_id == NULL) { 827 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 828 return WLAN_STATUS_INVALID_FTIE; 829 } 830 831 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 832 parse.r0kh_id, parse.r0kh_id_len); 833 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 834 sm->r0kh_id_len = parse.r0kh_id_len; 835 836 if (parse.rsn_pmkid == NULL) { 837 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 838 return WLAN_STATUS_INVALID_PMKID; 839 } 840 841 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 842 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 843 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 844 sm->wpa_auth->conf.r1_key_holder, sm->addr, 845 pmk_r1_name); 846 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 847 pmk_r1_name, WPA_PMK_NAME_LEN); 848 849 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 850 &pairwise) < 0) { 851 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id, 852 sm->r0kh_id_len, parse.rsn_pmkid) < 0) { 853 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 854 "PMK-R1 and unknown R0KH-ID"); 855 return WLAN_STATUS_INVALID_PMKID; 856 } 857 858 /* 859 * TODO: Should return "status pending" (and the caller should 860 * not send out response now). The real response will be sent 861 * once the response from R0KH is received. 862 */ 863 return WLAN_STATUS_INVALID_PMKID; 864 } 865 866 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 867 sm->pmk_r1_name_valid = 1; 868 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 869 870 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 871 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 872 "ANonce"); 873 return WLAN_STATUS_UNSPECIFIED_FAILURE; 874 } 875 876 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 877 sm->SNonce, WPA_NONCE_LEN); 878 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 879 sm->ANonce, WPA_NONCE_LEN); 880 881 ptk_len = pairwise == WPA_CIPHER_TKIP ? 64 : 48; 882 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 883 sm->wpa_auth->addr, pmk_r1_name, 884 (u8 *) &sm->PTK, ptk_len, ptk_name); 885 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 886 (u8 *) &sm->PTK, ptk_len); 887 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 888 889 sm->pairwise = pairwise; 890 wpa_ft_install_ptk(sm); 891 892 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 893 2 + FT_R1KH_ID_LEN + 200; 894 *resp_ies = os_zalloc(buflen); 895 if (*resp_ies == NULL) { 896 return WLAN_STATUS_UNSPECIFIED_FAILURE; 897 } 898 899 pos = *resp_ies; 900 end = *resp_ies + buflen; 901 902 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 903 if (ret < 0) { 904 os_free(*resp_ies); 905 *resp_ies = NULL; 906 return WLAN_STATUS_UNSPECIFIED_FAILURE; 907 } 908 pos += ret; 909 910 ret = wpa_write_mdie(conf, pos, end - pos); 911 if (ret < 0) { 912 os_free(*resp_ies); 913 *resp_ies = NULL; 914 return WLAN_STATUS_UNSPECIFIED_FAILURE; 915 } 916 pos += ret; 917 918 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 919 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 920 if (ret < 0) { 921 os_free(*resp_ies); 922 *resp_ies = NULL; 923 return WLAN_STATUS_UNSPECIFIED_FAILURE; 924 } 925 pos += ret; 926 927 *resp_ies_len = pos - *resp_ies; 928 929 return WLAN_STATUS_SUCCESS; 930 } 931 932 933 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 934 u16 auth_transaction, const u8 *ies, size_t ies_len, 935 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 936 u16 auth_transaction, u16 status, 937 const u8 *ies, size_t ies_len), 938 void *ctx) 939 { 940 u16 status; 941 u8 *resp_ies; 942 size_t resp_ies_len; 943 944 if (sm == NULL) { 945 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 946 "WPA SM not available"); 947 return; 948 } 949 950 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 951 " BSSID=" MACSTR " transaction=%d", 952 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 953 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 954 &resp_ies_len); 955 956 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 957 " auth_transaction=%d status=%d", 958 MAC2STR(sm->addr), auth_transaction + 1, status); 959 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 960 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 961 resp_ies, resp_ies_len); 962 os_free(resp_ies); 963 } 964 965 966 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 967 size_t ies_len) 968 { 969 struct wpa_ft_ies parse; 970 struct rsn_mdie *mdie; 971 struct rsn_ftie *ftie; 972 u8 mic[16]; 973 unsigned int count; 974 975 if (sm == NULL) 976 return WLAN_STATUS_UNSPECIFIED_FAILURE; 977 978 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 979 980 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 981 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 982 return WLAN_STATUS_UNSPECIFIED_FAILURE; 983 } 984 985 if (parse.rsn == NULL) { 986 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 987 return WLAN_STATUS_UNSPECIFIED_FAILURE; 988 } 989 990 if (parse.rsn_pmkid == NULL) { 991 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 992 return WLAN_STATUS_INVALID_PMKID; 993 } 994 995 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) 996 { 997 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 998 "with the PMKR1Name derived from auth request"); 999 return WLAN_STATUS_INVALID_PMKID; 1000 } 1001 1002 mdie = (struct rsn_mdie *) parse.mdie; 1003 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1004 os_memcmp(mdie->mobility_domain, 1005 sm->wpa_auth->conf.mobility_domain, 1006 MOBILITY_DOMAIN_ID_LEN) != 0) { 1007 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1008 return WLAN_STATUS_INVALID_MDIE; 1009 } 1010 1011 ftie = (struct rsn_ftie *) parse.ftie; 1012 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1013 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1014 return WLAN_STATUS_INVALID_FTIE; 1015 } 1016 1017 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1018 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1019 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1020 ftie->snonce, WPA_NONCE_LEN); 1021 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1022 sm->SNonce, WPA_NONCE_LEN); 1023 return -1; 1024 } 1025 1026 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1027 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1028 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1029 ftie->anonce, WPA_NONCE_LEN); 1030 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1031 sm->ANonce, WPA_NONCE_LEN); 1032 return -1; 1033 } 1034 1035 1036 if (parse.r0kh_id == NULL) { 1037 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1038 return -1; 1039 } 1040 1041 if (parse.r0kh_id_len != sm->r0kh_id_len || 1042 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 1043 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1044 "the current R0KH-ID"); 1045 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1046 parse.r0kh_id, parse.r0kh_id_len); 1047 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1048 sm->r0kh_id, sm->r0kh_id_len); 1049 return -1; 1050 } 1051 1052 if (parse.r1kh_id == NULL) { 1053 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1054 return -1; 1055 } 1056 1057 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1058 FT_R1KH_ID_LEN) != 0) { 1059 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1060 "ReassocReq"); 1061 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1062 parse.r1kh_id, FT_R1KH_ID_LEN); 1063 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1064 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1065 return -1; 1066 } 1067 1068 if (parse.rsn_pmkid == NULL || 1069 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 1070 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1071 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1072 return -1; 1073 } 1074 1075 count = 3; 1076 if (parse.ric) 1077 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1078 if (ftie->mic_control[1] != count) { 1079 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1080 "Control: received %u expected %u", 1081 ftie->mic_control[1], count); 1082 return -1; 1083 } 1084 1085 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5, 1086 parse.mdie - 2, parse.mdie_len + 2, 1087 parse.ftie - 2, parse.ftie_len + 2, 1088 parse.rsn - 2, parse.rsn_len + 2, 1089 parse.ric, parse.ric_len, 1090 mic) < 0) { 1091 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1092 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1093 } 1094 1095 if (os_memcmp(mic, ftie->mic, 16) != 0) { 1096 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1097 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1098 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1099 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 1100 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 1101 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", 1102 parse.mdie - 2, parse.mdie_len + 2); 1103 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", 1104 parse.ftie - 2, parse.ftie_len + 2); 1105 wpa_hexdump(MSG_MSGDUMP, "FT: RSN", 1106 parse.rsn - 2, parse.rsn_len + 2); 1107 return WLAN_STATUS_INVALID_FTIE; 1108 } 1109 1110 return WLAN_STATUS_SUCCESS; 1111 } 1112 1113 1114 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1115 { 1116 const u8 *sta_addr, *target_ap; 1117 const u8 *ies; 1118 size_t ies_len; 1119 u8 action; 1120 struct ft_rrb_frame *frame; 1121 1122 if (sm == NULL) 1123 return -1; 1124 1125 /* 1126 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1127 * FT Request action frame body[variable] 1128 */ 1129 1130 if (len < 14) { 1131 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1132 "(len=%lu)", (unsigned long) len); 1133 return -1; 1134 } 1135 1136 action = data[1]; 1137 sta_addr = data + 2; 1138 target_ap = data + 8; 1139 ies = data + 14; 1140 ies_len = len - 14; 1141 1142 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1143 " Target AP=" MACSTR " Action=%d)", 1144 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1145 1146 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1147 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1148 "STA=" MACSTR " STA-Address=" MACSTR, 1149 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1150 return -1; 1151 } 1152 1153 /* 1154 * Do some sanity checking on the target AP address (not own and not 1155 * broadcast. This could be extended to filter based on a list of known 1156 * APs in the MD (if such a list were configured). 1157 */ 1158 if ((target_ap[0] & 0x01) || 1159 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1160 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1161 "frame"); 1162 return -1; 1163 } 1164 1165 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1166 1167 /* RRB - Forward action frame to the target AP */ 1168 frame = os_malloc(sizeof(*frame) + len); 1169 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1170 frame->packet_type = FT_PACKET_REQUEST; 1171 frame->action_length = host_to_le16(len); 1172 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1173 os_memcpy(frame + 1, data, len); 1174 1175 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1176 sizeof(*frame) + len); 1177 os_free(frame); 1178 1179 return 0; 1180 } 1181 1182 1183 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1184 const u8 *current_ap, const u8 *sta_addr, 1185 const u8 *body, size_t len) 1186 { 1187 struct wpa_state_machine *sm; 1188 u16 status; 1189 u8 *resp_ies, *pos; 1190 size_t resp_ies_len, rlen; 1191 struct ft_rrb_frame *frame; 1192 1193 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1194 if (sm == NULL) { 1195 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1196 "RRB Request"); 1197 return -1; 1198 } 1199 1200 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1201 1202 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1203 &resp_ies_len); 1204 1205 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1206 " CurrentAP=" MACSTR " status=%d", 1207 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1208 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1209 1210 /* RRB - Forward action frame response to the Current AP */ 1211 1212 /* 1213 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1214 * Status_Code[2] FT Request action frame body[variable] 1215 */ 1216 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1217 1218 frame = os_malloc(sizeof(*frame) + rlen); 1219 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1220 frame->packet_type = FT_PACKET_RESPONSE; 1221 frame->action_length = host_to_le16(rlen); 1222 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1223 pos = (u8 *) (frame + 1); 1224 *pos++ = WLAN_ACTION_FT; 1225 *pos++ = 2; /* Action: Response */ 1226 os_memcpy(pos, sta_addr, ETH_ALEN); 1227 pos += ETH_ALEN; 1228 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1229 pos += ETH_ALEN; 1230 WPA_PUT_LE16(pos, status); 1231 pos += 2; 1232 if (resp_ies) { 1233 os_memcpy(pos, resp_ies, resp_ies_len); 1234 os_free(resp_ies); 1235 } 1236 1237 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1238 sizeof(*frame) + rlen); 1239 os_free(frame); 1240 1241 return 0; 1242 } 1243 1244 1245 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1246 const u8 *src_addr, 1247 const u8 *data, size_t data_len) 1248 { 1249 struct ft_r0kh_r1kh_pull_frame *frame, f; 1250 struct ft_remote_r1kh *r1kh; 1251 struct ft_r0kh_r1kh_resp_frame resp, r; 1252 u8 pmk_r0[PMK_LEN]; 1253 int pairwise; 1254 1255 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1256 1257 if (data_len < sizeof(*frame)) 1258 return -1; 1259 1260 r1kh = wpa_auth->conf.r1kh_list; 1261 while (r1kh) { 1262 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1263 break; 1264 r1kh = r1kh->next; 1265 } 1266 if (r1kh == NULL) { 1267 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1268 "PMK-R1 pull source address " MACSTR, 1269 MAC2STR(src_addr)); 1270 return -1; 1271 } 1272 1273 frame = (struct ft_r0kh_r1kh_pull_frame *) data; 1274 /* aes_unwrap() does not support inplace decryption, so use a temporary 1275 * buffer for the data. */ 1276 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1277 frame->nonce, f.nonce) < 0) { 1278 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1279 "request from " MACSTR, MAC2STR(src_addr)); 1280 return -1; 1281 } 1282 1283 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1284 f.nonce, sizeof(f.nonce)); 1285 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1286 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1287 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" 1288 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1289 1290 os_memset(&resp, 0, sizeof(resp)); 1291 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1292 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1293 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1294 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1295 1296 /* aes_wrap() does not support inplace encryption, so use a temporary 1297 * buffer for the data. */ 1298 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1299 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1300 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1301 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1302 &pairwise) < 0) { 1303 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1304 "PMK-R1 pull"); 1305 return -1; 1306 } 1307 1308 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1309 r.pmk_r1, r.pmk_r1_name); 1310 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1311 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1312 WPA_PMK_NAME_LEN); 1313 r.pairwise = host_to_le16(pairwise); 1314 1315 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1316 r.nonce, resp.nonce) < 0) { 1317 os_memset(pmk_r0, 0, PMK_LEN); 1318 return -1; 1319 } 1320 1321 os_memset(pmk_r0, 0, PMK_LEN); 1322 1323 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1324 1325 return 0; 1326 } 1327 1328 1329 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1330 const u8 *src_addr, 1331 const u8 *data, size_t data_len) 1332 { 1333 struct ft_r0kh_r1kh_resp_frame *frame, f; 1334 struct ft_remote_r0kh *r0kh; 1335 int pairwise; 1336 1337 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1338 1339 if (data_len < sizeof(*frame)) 1340 return -1; 1341 1342 r0kh = wpa_auth->conf.r0kh_list; 1343 while (r0kh) { 1344 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1345 break; 1346 r0kh = r0kh->next; 1347 } 1348 if (r0kh == NULL) { 1349 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1350 "PMK-R0 pull response source address " MACSTR, 1351 MAC2STR(src_addr)); 1352 return -1; 1353 } 1354 1355 frame = (struct ft_r0kh_r1kh_resp_frame *) data; 1356 /* aes_unwrap() does not support inplace decryption, so use a temporary 1357 * buffer for the data. */ 1358 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1359 frame->nonce, f.nonce) < 0) { 1360 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1361 "response from " MACSTR, MAC2STR(src_addr)); 1362 return -1; 1363 } 1364 1365 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1366 != 0) { 1367 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1368 "matching R1KH-ID"); 1369 return -1; 1370 } 1371 1372 /* TODO: verify that <nonce,s1kh_id> matches with a pending request 1373 * and call this requests callback function to finish request 1374 * processing */ 1375 1376 pairwise = le_to_host16(f.pairwise); 1377 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1378 f.nonce, sizeof(f.nonce)); 1379 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" 1380 MACSTR " pairwise=0x%x", 1381 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1382 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1383 f.pmk_r1, PMK_LEN); 1384 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1385 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1386 1387 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1388 pairwise); 1389 os_memset(f.pmk_r1, 0, PMK_LEN); 1390 1391 return 0; 1392 } 1393 1394 1395 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1396 const u8 *src_addr, 1397 const u8 *data, size_t data_len) 1398 { 1399 struct ft_r0kh_r1kh_push_frame *frame, f; 1400 struct ft_remote_r0kh *r0kh; 1401 struct os_time now; 1402 os_time_t tsend; 1403 int pairwise; 1404 1405 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1406 1407 if (data_len < sizeof(*frame)) 1408 return -1; 1409 1410 r0kh = wpa_auth->conf.r0kh_list; 1411 while (r0kh) { 1412 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1413 break; 1414 r0kh = r0kh->next; 1415 } 1416 if (r0kh == NULL) { 1417 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1418 "PMK-R0 push source address " MACSTR, 1419 MAC2STR(src_addr)); 1420 return -1; 1421 } 1422 1423 frame = (struct ft_r0kh_r1kh_push_frame *) data; 1424 /* aes_unwrap() does not support inplace decryption, so use a temporary 1425 * buffer for the data. */ 1426 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1427 frame->timestamp, f.timestamp) < 0) { 1428 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1429 MACSTR, MAC2STR(src_addr)); 1430 return -1; 1431 } 1432 1433 os_get_time(&now); 1434 tsend = WPA_GET_LE32(f.timestamp); 1435 if ((now.sec > tsend && now.sec - tsend > 60) || 1436 (now.sec < tsend && tsend - now.sec > 60)) { 1437 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1438 "timestamp: sender time %d own time %d\n", 1439 (int) tsend, (int) now.sec); 1440 return -1; 1441 } 1442 1443 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1444 != 0) { 1445 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1446 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1447 MAC2STR(f.r1kh_id), 1448 MAC2STR(wpa_auth->conf.r1_key_holder)); 1449 return -1; 1450 } 1451 1452 pairwise = le_to_host16(f.pairwise); 1453 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1454 MACSTR " pairwise=0x%x", 1455 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1456 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1457 f.pmk_r1, PMK_LEN); 1458 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1459 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1460 1461 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1462 pairwise); 1463 os_memset(f.pmk_r1, 0, PMK_LEN); 1464 1465 return 0; 1466 } 1467 1468 1469 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1470 const u8 *data, size_t data_len) 1471 { 1472 struct ft_rrb_frame *frame; 1473 u16 alen; 1474 const u8 *pos, *end, *start; 1475 u8 action; 1476 const u8 *sta_addr, *target_ap_addr; 1477 1478 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1479 MAC2STR(src_addr)); 1480 1481 if (data_len < sizeof(*frame)) { 1482 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1483 (unsigned long) data_len); 1484 return -1; 1485 } 1486 1487 pos = data; 1488 frame = (struct ft_rrb_frame *) pos; 1489 pos += sizeof(*frame); 1490 1491 alen = le_to_host16(frame->action_length); 1492 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1493 "action_length=%d ap_address=" MACSTR, 1494 frame->frame_type, frame->packet_type, alen, 1495 MAC2STR(frame->ap_address)); 1496 1497 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1498 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1499 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1500 "unrecognized type %d", frame->frame_type); 1501 return -1; 1502 } 1503 1504 if (alen > data_len - sizeof(*frame)) { 1505 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1506 "frame"); 1507 return -1; 1508 } 1509 1510 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1511 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1512 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1513 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1514 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1515 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1516 1517 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1518 1519 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1520 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1521 "room for Action Frame body); alen=%lu", 1522 (unsigned long) alen); 1523 return -1; 1524 } 1525 start = pos; 1526 end = pos + alen; 1527 1528 if (*pos != WLAN_ACTION_FT) { 1529 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1530 "%d", *pos); 1531 return -1; 1532 } 1533 1534 pos++; 1535 action = *pos++; 1536 sta_addr = pos; 1537 pos += ETH_ALEN; 1538 target_ap_addr = pos; 1539 pos += ETH_ALEN; 1540 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1541 MACSTR " target_ap_addr=" MACSTR, 1542 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1543 1544 if (frame->packet_type == FT_PACKET_REQUEST) { 1545 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1546 1547 if (action != 1) { 1548 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1549 "RRB Request", action); 1550 return -1; 1551 } 1552 1553 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1554 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1555 "RRB Request does not match with own " 1556 "address"); 1557 return -1; 1558 } 1559 1560 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1561 sta_addr, pos, end - pos) < 0) 1562 return -1; 1563 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1564 u16 status_code; 1565 1566 if (end - pos < 2) { 1567 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1568 "code in RRB Response"); 1569 return -1; 1570 } 1571 status_code = WPA_GET_LE16(pos); 1572 pos += 2; 1573 1574 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1575 "(status_code=%d)", status_code); 1576 1577 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1578 return -1; 1579 } else { 1580 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1581 "packet_type %d", frame->packet_type); 1582 return -1; 1583 } 1584 1585 return 0; 1586 } 1587 1588 1589 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1590 struct wpa_ft_pmk_r0_sa *pmk_r0, 1591 struct ft_remote_r1kh *r1kh, 1592 const u8 *s1kh_id, int pairwise) 1593 { 1594 struct ft_r0kh_r1kh_push_frame frame, f; 1595 struct os_time now; 1596 1597 os_memset(&frame, 0, sizeof(frame)); 1598 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1599 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1600 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1601 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1602 1603 /* aes_wrap() does not support inplace encryption, so use a temporary 1604 * buffer for the data. */ 1605 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1606 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1607 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1608 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1609 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1610 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1611 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1612 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1613 WPA_PMK_NAME_LEN); 1614 os_get_time(&now); 1615 WPA_PUT_LE32(f.timestamp, now.sec); 1616 f.pairwise = host_to_le16(pairwise); 1617 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1618 f.timestamp, frame.timestamp) < 0) 1619 return; 1620 1621 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1622 } 1623 1624 1625 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1626 { 1627 struct wpa_ft_pmk_r0_sa *r0; 1628 struct ft_remote_r1kh *r1kh; 1629 1630 if (!wpa_auth->conf.pmk_r1_push) 1631 return; 1632 1633 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1634 while (r0) { 1635 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1636 break; 1637 r0 = r0->next; 1638 } 1639 1640 if (r0 == NULL || r0->pmk_r1_pushed) 1641 return; 1642 r0->pmk_r1_pushed = 1; 1643 1644 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1645 "for STA " MACSTR, MAC2STR(addr)); 1646 1647 r1kh = wpa_auth->conf.r1kh_list; 1648 while (r1kh) { 1649 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1650 r1kh = r1kh->next; 1651 } 1652 } 1653 1654 #endif /* CONFIG_IEEE80211R */ 1655