1 /* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2015, Jouni Malinen <j (at) 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 "utils/eloop.h" 13 #include "utils/list.h" 14 #include "common/ieee802_11_defs.h" 15 #include "common/ieee802_11_common.h" 16 #include "crypto/aes_wrap.h" 17 #include "crypto/random.h" 18 #include "ap_config.h" 19 #include "ieee802_11.h" 20 #include "wmm.h" 21 #include "wpa_auth.h" 22 #include "wpa_auth_i.h" 23 24 25 #ifdef CONFIG_IEEE80211R_AP 26 27 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 28 const u8 *current_ap, const u8 *sta_addr, 29 u16 status, const u8 *resp_ies, 30 size_t resp_ies_len); 31 32 33 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, 34 const u8 *data, size_t data_len) 35 { 36 if (wpa_auth->cb->send_ether == NULL) 37 return -1; 38 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst)); 39 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB, 40 data, data_len); 41 } 42 43 44 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, 45 const u8 *dst, const u8 *data, size_t data_len) 46 { 47 if (wpa_auth->cb->send_ft_action == NULL) 48 return -1; 49 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst, 50 data, data_len); 51 } 52 53 54 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth, 55 const u8 *addr, const u8 *p2p_dev_addr, 56 const u8 *prev_psk) 57 { 58 if (wpa_auth->cb->get_psk == NULL) 59 return NULL; 60 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr, 61 prev_psk); 62 } 63 64 65 static struct wpa_state_machine * 66 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) 67 { 68 if (wpa_auth->cb->add_sta == NULL) 69 return NULL; 70 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr); 71 } 72 73 74 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth, 75 const u8 *sta_addr, 76 u8 *tspec_ie, size_t tspec_ielen) 77 { 78 if (wpa_auth->cb->add_tspec == NULL) { 79 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized"); 80 return -1; 81 } 82 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie, 83 tspec_ielen); 84 } 85 86 87 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) 88 { 89 u8 *pos = buf; 90 u8 capab; 91 if (len < 2 + sizeof(struct rsn_mdie)) 92 return -1; 93 94 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 95 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; 96 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 97 pos += MOBILITY_DOMAIN_ID_LEN; 98 capab = 0; 99 if (conf->ft_over_ds) 100 capab |= RSN_FT_CAPAB_FT_OVER_DS; 101 *pos++ = capab; 102 103 return pos - buf; 104 } 105 106 107 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, 108 size_t r0kh_id_len, 109 const u8 *anonce, const u8 *snonce, 110 u8 *buf, size_t len, const u8 *subelem, 111 size_t subelem_len) 112 { 113 u8 *pos = buf, *ielen; 114 struct rsn_ftie *hdr; 115 116 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + 117 subelem_len) 118 return -1; 119 120 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 121 ielen = pos++; 122 123 hdr = (struct rsn_ftie *) pos; 124 os_memset(hdr, 0, sizeof(*hdr)); 125 pos += sizeof(*hdr); 126 WPA_PUT_LE16(hdr->mic_control, 0); 127 if (anonce) 128 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); 129 if (snonce) 130 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); 131 132 /* Optional Parameters */ 133 *pos++ = FTIE_SUBELEM_R1KH_ID; 134 *pos++ = FT_R1KH_ID_LEN; 135 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); 136 pos += FT_R1KH_ID_LEN; 137 138 if (r0kh_id) { 139 *pos++ = FTIE_SUBELEM_R0KH_ID; 140 *pos++ = r0kh_id_len; 141 os_memcpy(pos, r0kh_id, r0kh_id_len); 142 pos += r0kh_id_len; 143 } 144 145 if (subelem) { 146 os_memcpy(pos, subelem, subelem_len); 147 pos += subelem_len; 148 } 149 150 *ielen = pos - buf - 2; 151 152 return pos - buf; 153 } 154 155 156 struct wpa_ft_pmk_r0_sa { 157 struct wpa_ft_pmk_r0_sa *next; 158 u8 pmk_r0[PMK_LEN]; 159 u8 pmk_r0_name[WPA_PMK_NAME_LEN]; 160 u8 spa[ETH_ALEN]; 161 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 162 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 163 int pmk_r1_pushed; 164 }; 165 166 struct wpa_ft_pmk_r1_sa { 167 struct wpa_ft_pmk_r1_sa *next; 168 u8 pmk_r1[PMK_LEN]; 169 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 170 u8 spa[ETH_ALEN]; 171 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 172 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 173 }; 174 175 struct wpa_ft_pmk_cache { 176 struct wpa_ft_pmk_r0_sa *pmk_r0; 177 struct wpa_ft_pmk_r1_sa *pmk_r1; 178 }; 179 180 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) 181 { 182 struct wpa_ft_pmk_cache *cache; 183 184 cache = os_zalloc(sizeof(*cache)); 185 186 return cache; 187 } 188 189 190 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) 191 { 192 struct wpa_ft_pmk_r0_sa *r0, *r0prev; 193 struct wpa_ft_pmk_r1_sa *r1, *r1prev; 194 195 r0 = cache->pmk_r0; 196 while (r0) { 197 r0prev = r0; 198 r0 = r0->next; 199 os_memset(r0prev->pmk_r0, 0, PMK_LEN); 200 os_free(r0prev); 201 } 202 203 r1 = cache->pmk_r1; 204 while (r1) { 205 r1prev = r1; 206 r1 = r1->next; 207 os_memset(r1prev->pmk_r1, 0, PMK_LEN); 208 os_free(r1prev); 209 } 210 211 os_free(cache); 212 } 213 214 215 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, 216 const u8 *spa, const u8 *pmk_r0, 217 const u8 *pmk_r0_name, int pairwise) 218 { 219 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 220 struct wpa_ft_pmk_r0_sa *r0; 221 222 /* TODO: add expiration and limit on number of entries in cache */ 223 224 r0 = os_zalloc(sizeof(*r0)); 225 if (r0 == NULL) 226 return -1; 227 228 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); 229 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 230 os_memcpy(r0->spa, spa, ETH_ALEN); 231 r0->pairwise = pairwise; 232 233 r0->next = cache->pmk_r0; 234 cache->pmk_r0 = r0; 235 236 return 0; 237 } 238 239 240 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, 241 const u8 *spa, const u8 *pmk_r0_name, 242 u8 *pmk_r0, int *pairwise) 243 { 244 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 245 struct wpa_ft_pmk_r0_sa *r0; 246 247 r0 = cache->pmk_r0; 248 while (r0) { 249 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && 250 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name, 251 WPA_PMK_NAME_LEN) == 0) { 252 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); 253 if (pairwise) 254 *pairwise = r0->pairwise; 255 return 0; 256 } 257 258 r0 = r0->next; 259 } 260 261 return -1; 262 } 263 264 265 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, 266 const u8 *spa, const u8 *pmk_r1, 267 const u8 *pmk_r1_name, int pairwise) 268 { 269 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 270 struct wpa_ft_pmk_r1_sa *r1; 271 272 /* TODO: add expiration and limit on number of entries in cache */ 273 274 r1 = os_zalloc(sizeof(*r1)); 275 if (r1 == NULL) 276 return -1; 277 278 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); 279 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 280 os_memcpy(r1->spa, spa, ETH_ALEN); 281 r1->pairwise = pairwise; 282 283 r1->next = cache->pmk_r1; 284 cache->pmk_r1 = r1; 285 286 return 0; 287 } 288 289 290 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, 291 const u8 *spa, const u8 *pmk_r1_name, 292 u8 *pmk_r1, int *pairwise) 293 { 294 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 295 struct wpa_ft_pmk_r1_sa *r1; 296 297 r1 = cache->pmk_r1; 298 while (r1) { 299 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && 300 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name, 301 WPA_PMK_NAME_LEN) == 0) { 302 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); 303 if (pairwise) 304 *pairwise = r1->pairwise; 305 return 0; 306 } 307 308 r1 = r1->next; 309 } 310 311 return -1; 312 } 313 314 315 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm, 316 const u8 *ies, size_t ies_len, 317 const u8 *pmk_r0_name) 318 { 319 struct ft_remote_r0kh *r0kh; 320 struct ft_r0kh_r1kh_pull_frame frame, f; 321 322 r0kh = sm->wpa_auth->conf.r0kh_list; 323 while (r0kh) { 324 if (r0kh->id_len == sm->r0kh_id_len && 325 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) == 326 0) 327 break; 328 r0kh = r0kh->next; 329 } 330 if (r0kh == NULL) { 331 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID", 332 sm->r0kh_id, sm->r0kh_id_len); 333 return -1; 334 } 335 336 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 337 "address " MACSTR, MAC2STR(r0kh->addr)); 338 339 os_memset(&frame, 0, sizeof(frame)); 340 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 341 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 342 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 343 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN); 344 345 /* aes_wrap() does not support inplace encryption, so use a temporary 346 * buffer for the data. */ 347 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) { 348 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 349 "nonce"); 350 return -1; 351 } 352 os_memcpy(sm->ft_pending_pull_nonce, f.nonce, 353 FT_R0KH_R1KH_PULL_NONCE_LEN); 354 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 355 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 356 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN); 357 os_memset(f.pad, 0, sizeof(f.pad)); 358 359 if (aes_wrap(r0kh->key, sizeof(r0kh->key), 360 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 361 f.nonce, frame.nonce) < 0) 362 return -1; 363 364 wpabuf_free(sm->ft_pending_req_ies); 365 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len); 366 if (sm->ft_pending_req_ies == NULL) 367 return -1; 368 369 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 370 371 return 0; 372 } 373 374 375 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 376 struct wpa_ptk *ptk) 377 { 378 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 379 u8 pmk_r1[PMK_LEN]; 380 u8 ptk_name[WPA_PMK_NAME_LEN]; 381 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 382 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 383 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 384 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 385 const u8 *ssid = sm->wpa_auth->conf.ssid; 386 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 387 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local; 388 389 if (sm->xxkey_len == 0) { 390 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 391 "derivation"); 392 return -1; 393 } 394 395 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 396 r0kh, r0kh_len, sm->addr, 397 pmk_r0, pmk_r0_name) < 0) 398 return -1; 399 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 400 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 401 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) 402 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 403 sm->pairwise); 404 405 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 406 pmk_r1, sm->pmk_r1_name) < 0) 407 return -1; 408 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 409 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 410 WPA_PMK_NAME_LEN); 411 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) 412 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, 413 sm->pmk_r1_name, sm->pairwise); 414 415 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 416 sm->wpa_auth->addr, sm->pmk_r1_name, 417 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise); 418 } 419 420 421 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 422 const u8 *addr, int idx, u8 *seq) 423 { 424 if (wpa_auth->cb->get_seqnum == NULL) 425 return -1; 426 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq); 427 } 428 429 430 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 431 { 432 u8 *subelem; 433 struct wpa_group *gsm = sm->group; 434 size_t subelem_len, pad_len; 435 const u8 *key; 436 size_t key_len; 437 u8 keybuf[32]; 438 439 key_len = gsm->GTK_len; 440 if (key_len > sizeof(keybuf)) 441 return NULL; 442 443 /* 444 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 445 * than 16 bytes. 446 */ 447 pad_len = key_len % 8; 448 if (pad_len) 449 pad_len = 8 - pad_len; 450 if (key_len + pad_len < 16) 451 pad_len += 8; 452 if (pad_len && key_len < sizeof(keybuf)) { 453 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 454 os_memset(keybuf + key_len, 0, pad_len); 455 keybuf[key_len] = 0xdd; 456 key_len += pad_len; 457 key = keybuf; 458 } else 459 key = gsm->GTK[gsm->GN - 1]; 460 461 /* 462 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 463 * Key[5..32]. 464 */ 465 subelem_len = 13 + key_len + 8; 466 subelem = os_zalloc(subelem_len); 467 if (subelem == NULL) 468 return NULL; 469 470 subelem[0] = FTIE_SUBELEM_GTK; 471 subelem[1] = 11 + key_len + 8; 472 /* Key ID in B0-B1 of Key Info */ 473 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 474 subelem[4] = gsm->GTK_len; 475 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 476 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key, 477 subelem + 13)) { 478 os_free(subelem); 479 return NULL; 480 } 481 482 *len = subelem_len; 483 return subelem; 484 } 485 486 487 #ifdef CONFIG_IEEE80211W 488 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 489 { 490 u8 *subelem, *pos; 491 struct wpa_group *gsm = sm->group; 492 size_t subelem_len; 493 494 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 495 * Key[16+8] */ 496 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 497 subelem = os_zalloc(subelem_len); 498 if (subelem == NULL) 499 return NULL; 500 501 pos = subelem; 502 *pos++ = FTIE_SUBELEM_IGTK; 503 *pos++ = subelem_len - 2; 504 WPA_PUT_LE16(pos, gsm->GN_igtk); 505 pos += 2; 506 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 507 pos += 6; 508 *pos++ = WPA_IGTK_LEN; 509 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8, 510 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 511 os_free(subelem); 512 return NULL; 513 } 514 515 *len = subelem_len; 516 return subelem; 517 } 518 #endif /* CONFIG_IEEE80211W */ 519 520 521 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm, 522 u8 *pos, u8 *end, u8 id, u8 descr_count, 523 const u8 *ies, size_t ies_len) 524 { 525 struct ieee802_11_elems parse; 526 struct rsn_rdie *rdie; 527 528 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 529 id, descr_count); 530 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 531 ies, ies_len); 532 533 if (end - pos < (int) sizeof(*rdie)) { 534 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 535 return pos; 536 } 537 538 *pos++ = WLAN_EID_RIC_DATA; 539 *pos++ = sizeof(*rdie); 540 rdie = (struct rsn_rdie *) pos; 541 rdie->id = id; 542 rdie->descr_count = 0; 543 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 544 pos += sizeof(*rdie); 545 546 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 547 ParseFailed) { 548 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 549 rdie->status_code = 550 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 551 return pos; 552 } 553 554 if (parse.wmm_tspec) { 555 struct wmm_tspec_element *tspec; 556 557 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 558 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 559 "(%d)", (int) parse.wmm_tspec_len); 560 rdie->status_code = 561 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 562 return pos; 563 } 564 if (end - pos < (int) sizeof(*tspec)) { 565 wpa_printf(MSG_ERROR, "FT: Not enough room for " 566 "response TSPEC"); 567 rdie->status_code = 568 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 569 return pos; 570 } 571 tspec = (struct wmm_tspec_element *) pos; 572 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 573 } 574 575 #ifdef NEED_AP_MLME 576 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { 577 int res; 578 579 res = wmm_process_tspec((struct wmm_tspec_element *) pos); 580 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 581 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 582 rdie->status_code = 583 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 584 else if (res == WMM_ADDTS_STATUS_REFUSED) 585 rdie->status_code = 586 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 587 else { 588 /* TSPEC accepted; include updated TSPEC in response */ 589 rdie->descr_count = 1; 590 pos += sizeof(struct wmm_tspec_element); 591 } 592 return pos; 593 } 594 #endif /* NEED_AP_MLME */ 595 596 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { 597 int res; 598 599 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, 600 sizeof(struct wmm_tspec_element)); 601 if (res >= 0) { 602 if (res) 603 rdie->status_code = host_to_le16(res); 604 else { 605 /* TSPEC accepted; include updated TSPEC in 606 * response */ 607 rdie->descr_count = 1; 608 pos += sizeof(struct wmm_tspec_element); 609 } 610 return pos; 611 } 612 } 613 614 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 615 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 616 return pos; 617 } 618 619 620 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, 621 const u8 *ric, size_t ric_len) 622 { 623 const u8 *rpos, *start; 624 const struct rsn_rdie *rdie; 625 626 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 627 628 rpos = ric; 629 while (rpos + sizeof(*rdie) < ric + ric_len) { 630 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 631 rpos + 2 + rpos[1] > ric + ric_len) 632 break; 633 rdie = (const struct rsn_rdie *) (rpos + 2); 634 rpos += 2 + rpos[1]; 635 start = rpos; 636 637 while (rpos + 2 <= ric + ric_len && 638 rpos + 2 + rpos[1] <= ric + ric_len) { 639 if (rpos[0] == WLAN_EID_RIC_DATA) 640 break; 641 rpos += 2 + rpos[1]; 642 } 643 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, 644 rdie->descr_count, 645 start, rpos - start); 646 } 647 648 return pos; 649 } 650 651 652 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 653 size_t max_len, int auth_alg, 654 const u8 *req_ies, size_t req_ies_len) 655 { 656 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 657 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 658 int res; 659 struct wpa_auth_config *conf; 660 struct rsn_ftie *_ftie; 661 struct wpa_ft_ies parse; 662 u8 *ric_start; 663 u8 *anonce, *snonce; 664 665 if (sm == NULL) 666 return pos; 667 668 conf = &sm->wpa_auth->conf; 669 670 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 671 return pos; 672 673 end = pos + max_len; 674 675 if (auth_alg == WLAN_AUTH_FT) { 676 /* 677 * RSN (only present if this is a Reassociation Response and 678 * part of a fast BSS transition) 679 */ 680 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 681 if (res < 0) 682 return pos; 683 rsnie = pos; 684 rsnie_len = res; 685 pos += res; 686 } 687 688 /* Mobility Domain Information */ 689 res = wpa_write_mdie(conf, pos, end - pos); 690 if (res < 0) 691 return pos; 692 mdie = pos; 693 mdie_len = res; 694 pos += res; 695 696 /* Fast BSS Transition Information */ 697 if (auth_alg == WLAN_AUTH_FT) { 698 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 699 r0kh_id = sm->r0kh_id; 700 r0kh_id_len = sm->r0kh_id_len; 701 anonce = sm->ANonce; 702 snonce = sm->SNonce; 703 #ifdef CONFIG_IEEE80211W 704 if (sm->mgmt_frame_prot) { 705 u8 *igtk; 706 size_t igtk_len; 707 u8 *nbuf; 708 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 709 if (igtk == NULL) { 710 os_free(subelem); 711 return pos; 712 } 713 nbuf = os_realloc(subelem, subelem_len + igtk_len); 714 if (nbuf == NULL) { 715 os_free(subelem); 716 os_free(igtk); 717 return pos; 718 } 719 subelem = nbuf; 720 os_memcpy(subelem + subelem_len, igtk, igtk_len); 721 subelem_len += igtk_len; 722 os_free(igtk); 723 } 724 #endif /* CONFIG_IEEE80211W */ 725 } else { 726 r0kh_id = conf->r0_key_holder; 727 r0kh_id_len = conf->r0_key_holder_len; 728 anonce = NULL; 729 snonce = NULL; 730 } 731 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 732 end - pos, subelem, subelem_len); 733 os_free(subelem); 734 if (res < 0) 735 return pos; 736 ftie = pos; 737 ftie_len = res; 738 pos += res; 739 740 _ftie = (struct rsn_ftie *) (ftie + 2); 741 if (auth_alg == WLAN_AUTH_FT) 742 _ftie->mic_control[1] = 3; /* Information element count */ 743 744 ric_start = pos; 745 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 746 pos = wpa_ft_process_ric(sm, pos, end, parse.ric, 747 parse.ric_len); 748 if (auth_alg == WLAN_AUTH_FT) 749 _ftie->mic_control[1] += 750 ieee802_11_ie_count(ric_start, 751 pos - ric_start); 752 } 753 if (ric_start == pos) 754 ric_start = NULL; 755 756 if (auth_alg == WLAN_AUTH_FT && 757 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 758 sm->wpa_auth->addr, 6, 759 mdie, mdie_len, ftie, ftie_len, 760 rsnie, rsnie_len, 761 ric_start, ric_start ? pos - ric_start : 0, 762 _ftie->mic) < 0) 763 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 764 765 os_free(sm->assoc_resp_ftie); 766 sm->assoc_resp_ftie = os_malloc(ftie_len); 767 if (sm->assoc_resp_ftie) 768 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 769 770 return pos; 771 } 772 773 774 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 775 int vlan_id, 776 enum wpa_alg alg, const u8 *addr, int idx, 777 u8 *key, size_t key_len) 778 { 779 if (wpa_auth->cb->set_key == NULL) 780 return -1; 781 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx, 782 key, key_len); 783 } 784 785 786 void wpa_ft_install_ptk(struct wpa_state_machine *sm) 787 { 788 enum wpa_alg alg; 789 int klen; 790 791 /* MLME-SETKEYS.request(PTK) */ 792 alg = wpa_cipher_to_alg(sm->pairwise); 793 klen = wpa_cipher_key_len(sm->pairwise); 794 if (!wpa_cipher_valid_pairwise(sm->pairwise)) { 795 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 796 "PTK configuration", sm->pairwise); 797 return; 798 } 799 800 /* FIX: add STA entry to kernel/driver here? The set_key will fail 801 * most likely without this.. At the moment, STA entry is added only 802 * after association has been completed. This function will be called 803 * again after association to get the PTK configured, but that could be 804 * optimized by adding the STA entry earlier. 805 */ 806 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 807 sm->PTK.tk, klen)) 808 return; 809 810 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 811 sm->pairwise_set = TRUE; 812 } 813 814 815 /* Derive PMK-R1 from PSK, check all available PSK */ 816 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm, 817 const u8 *req_pmk_r1_name, 818 u8 *out_pmk_r1, int *out_pairwise) 819 { 820 const u8 *pmk = NULL; 821 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 822 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 823 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 824 const u8 *mdid = wpa_auth->conf.mobility_domain; 825 const u8 *r0kh = sm->r0kh_id; 826 size_t r0kh_len = sm->r0kh_id_len; 827 const u8 *r1kh = wpa_auth->conf.r1_key_holder; 828 const u8 *ssid = wpa_auth->conf.ssid; 829 size_t ssid_len = wpa_auth->conf.ssid_len; 830 int pairwise; 831 832 pairwise = sm->pairwise; 833 834 for (;;) { 835 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr, 836 pmk); 837 if (pmk == NULL) 838 break; 839 840 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh, 841 r0kh_len, sm->addr, 842 pmk_r0, pmk_r0_name) < 0 || 843 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 844 pmk_r1, pmk_r1_name) < 0 || 845 os_memcmp_const(pmk_r1_name, req_pmk_r1_name, 846 WPA_PMK_NAME_LEN) != 0) 847 continue; 848 849 /* We found a PSK that matches the requested pmk_r1_name */ 850 wpa_printf(MSG_DEBUG, 851 "FT: Found PSK to generate PMK-R1 locally"); 852 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN); 853 if (out_pairwise) 854 *out_pairwise = pairwise; 855 return 0; 856 } 857 858 wpa_printf(MSG_DEBUG, 859 "FT: Did not find PSK to generate PMK-R1 locally"); 860 return -1; 861 } 862 863 864 /* Detect the configuration the station asked for. 865 * Required to detect FT-PSK and pairwise cipher. 866 */ 867 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm, 868 struct wpa_ft_ies *parse) 869 { 870 int key_mgmt, ciphers; 871 872 if (sm->wpa_key_mgmt) 873 return 0; 874 875 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt; 876 if (!key_mgmt) { 877 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from " 878 MACSTR, parse->key_mgmt, MAC2STR(sm->addr)); 879 return -1; 880 } 881 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) 882 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X; 883 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK) 884 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK; 885 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise; 886 if (!ciphers) { 887 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from " 888 MACSTR, 889 parse->pairwise_cipher, MAC2STR(sm->addr)); 890 return -1; 891 } 892 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0); 893 894 return 0; 895 } 896 897 898 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, 899 const u8 *ies, size_t ies_len, 900 u8 **resp_ies, size_t *resp_ies_len) 901 { 902 struct rsn_mdie *mdie; 903 struct rsn_ftie *ftie; 904 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 905 u8 ptk_name[WPA_PMK_NAME_LEN]; 906 struct wpa_auth_config *conf; 907 struct wpa_ft_ies parse; 908 size_t buflen; 909 int ret; 910 u8 *pos, *end; 911 int pairwise; 912 913 *resp_ies = NULL; 914 *resp_ies_len = 0; 915 916 sm->pmk_r1_name_valid = 0; 917 conf = &sm->wpa_auth->conf; 918 919 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 920 ies, ies_len); 921 922 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 923 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 924 return WLAN_STATUS_UNSPECIFIED_FAILURE; 925 } 926 927 mdie = (struct rsn_mdie *) parse.mdie; 928 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 929 os_memcmp(mdie->mobility_domain, 930 sm->wpa_auth->conf.mobility_domain, 931 MOBILITY_DOMAIN_ID_LEN) != 0) { 932 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 933 return WLAN_STATUS_INVALID_MDIE; 934 } 935 936 ftie = (struct rsn_ftie *) parse.ftie; 937 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 938 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 939 return WLAN_STATUS_INVALID_FTIE; 940 } 941 942 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 943 944 if (parse.r0kh_id == NULL) { 945 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 946 return WLAN_STATUS_INVALID_FTIE; 947 } 948 949 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 950 parse.r0kh_id, parse.r0kh_id_len); 951 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 952 sm->r0kh_id_len = parse.r0kh_id_len; 953 954 if (parse.rsn_pmkid == NULL) { 955 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 956 return WLAN_STATUS_INVALID_PMKID; 957 } 958 959 if (wpa_ft_set_key_mgmt(sm, &parse) < 0) 960 return WLAN_STATUS_UNSPECIFIED_FAILURE; 961 962 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 963 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 964 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid, 965 sm->wpa_auth->conf.r1_key_holder, sm->addr, 966 pmk_r1_name) < 0) 967 return WLAN_STATUS_UNSPECIFIED_FAILURE; 968 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 969 pmk_r1_name, WPA_PMK_NAME_LEN); 970 971 if (conf->ft_psk_generate_local && 972 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) { 973 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0) 974 return WLAN_STATUS_INVALID_PMKID; 975 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, 976 pmk_r1, &pairwise) < 0) { 977 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { 978 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 979 "PMK-R1 and unknown R0KH-ID"); 980 return WLAN_STATUS_INVALID_PMKID; 981 } 982 983 return -1; /* Status pending */ 984 } 985 986 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 987 sm->pmk_r1_name_valid = 1; 988 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 989 990 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 991 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 992 "ANonce"); 993 return WLAN_STATUS_UNSPECIFIED_FAILURE; 994 } 995 996 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 997 sm->SNonce, WPA_NONCE_LEN); 998 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 999 sm->ANonce, WPA_NONCE_LEN); 1000 1001 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 1002 sm->wpa_auth->addr, pmk_r1_name, 1003 &sm->PTK, ptk_name, sm->wpa_key_mgmt, 1004 pairwise) < 0) 1005 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1006 1007 sm->pairwise = pairwise; 1008 sm->PTK_valid = TRUE; 1009 wpa_ft_install_ptk(sm); 1010 1011 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 1012 2 + FT_R1KH_ID_LEN + 200; 1013 *resp_ies = os_zalloc(buflen); 1014 if (*resp_ies == NULL) 1015 goto fail; 1016 1017 pos = *resp_ies; 1018 end = *resp_ies + buflen; 1019 1020 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 1021 if (ret < 0) 1022 goto fail; 1023 pos += ret; 1024 1025 ret = wpa_write_mdie(conf, pos, end - pos); 1026 if (ret < 0) 1027 goto fail; 1028 pos += ret; 1029 1030 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 1031 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 1032 if (ret < 0) 1033 goto fail; 1034 pos += ret; 1035 1036 *resp_ies_len = pos - *resp_ies; 1037 1038 return WLAN_STATUS_SUCCESS; 1039 fail: 1040 os_free(*resp_ies); 1041 *resp_ies = NULL; 1042 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1043 } 1044 1045 1046 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 1047 u16 auth_transaction, const u8 *ies, size_t ies_len, 1048 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 1049 u16 auth_transaction, u16 status, 1050 const u8 *ies, size_t ies_len), 1051 void *ctx) 1052 { 1053 u16 status; 1054 u8 *resp_ies; 1055 size_t resp_ies_len; 1056 int res; 1057 1058 if (sm == NULL) { 1059 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 1060 "WPA SM not available"); 1061 return; 1062 } 1063 1064 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 1065 " BSSID=" MACSTR " transaction=%d", 1066 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 1067 sm->ft_pending_cb = cb; 1068 sm->ft_pending_cb_ctx = ctx; 1069 sm->ft_pending_auth_transaction = auth_transaction; 1070 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 1071 &resp_ies_len); 1072 if (res < 0) { 1073 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); 1074 return; 1075 } 1076 status = res; 1077 1078 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 1079 " auth_transaction=%d status=%d", 1080 MAC2STR(sm->addr), auth_transaction + 1, status); 1081 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1082 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 1083 resp_ies, resp_ies_len); 1084 os_free(resp_ies); 1085 } 1086 1087 1088 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 1089 size_t ies_len) 1090 { 1091 struct wpa_ft_ies parse; 1092 struct rsn_mdie *mdie; 1093 struct rsn_ftie *ftie; 1094 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1095 size_t mic_len = 16; 1096 unsigned int count; 1097 1098 if (sm == NULL) 1099 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1100 1101 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 1102 1103 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1104 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1105 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1106 } 1107 1108 if (parse.rsn == NULL) { 1109 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1110 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1111 } 1112 1113 if (parse.rsn_pmkid == NULL) { 1114 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1115 return WLAN_STATUS_INVALID_PMKID; 1116 } 1117 1118 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) 1119 != 0) { 1120 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1121 "with the PMKR1Name derived from auth request"); 1122 return WLAN_STATUS_INVALID_PMKID; 1123 } 1124 1125 mdie = (struct rsn_mdie *) parse.mdie; 1126 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1127 os_memcmp(mdie->mobility_domain, 1128 sm->wpa_auth->conf.mobility_domain, 1129 MOBILITY_DOMAIN_ID_LEN) != 0) { 1130 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1131 return WLAN_STATUS_INVALID_MDIE; 1132 } 1133 1134 ftie = (struct rsn_ftie *) parse.ftie; 1135 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1136 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1137 return WLAN_STATUS_INVALID_FTIE; 1138 } 1139 1140 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1141 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1142 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1143 ftie->snonce, WPA_NONCE_LEN); 1144 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1145 sm->SNonce, WPA_NONCE_LEN); 1146 return WLAN_STATUS_INVALID_FTIE; 1147 } 1148 1149 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1150 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1151 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1152 ftie->anonce, WPA_NONCE_LEN); 1153 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1154 sm->ANonce, WPA_NONCE_LEN); 1155 return WLAN_STATUS_INVALID_FTIE; 1156 } 1157 1158 1159 if (parse.r0kh_id == NULL) { 1160 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1161 return WLAN_STATUS_INVALID_FTIE; 1162 } 1163 1164 if (parse.r0kh_id_len != sm->r0kh_id_len || 1165 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 1166 { 1167 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1168 "the current R0KH-ID"); 1169 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1170 parse.r0kh_id, parse.r0kh_id_len); 1171 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1172 sm->r0kh_id, sm->r0kh_id_len); 1173 return WLAN_STATUS_INVALID_FTIE; 1174 } 1175 1176 if (parse.r1kh_id == NULL) { 1177 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1178 return WLAN_STATUS_INVALID_FTIE; 1179 } 1180 1181 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1182 FT_R1KH_ID_LEN) != 0) { 1183 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1184 "ReassocReq"); 1185 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1186 parse.r1kh_id, FT_R1KH_ID_LEN); 1187 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1188 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1189 return WLAN_STATUS_INVALID_FTIE; 1190 } 1191 1192 if (parse.rsn_pmkid == NULL || 1193 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 1194 { 1195 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1196 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1197 return WLAN_STATUS_INVALID_PMKID; 1198 } 1199 1200 count = 3; 1201 if (parse.ric) 1202 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1203 if (ftie->mic_control[1] != count) { 1204 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1205 "Control: received %u expected %u", 1206 ftie->mic_control[1], count); 1207 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1208 } 1209 1210 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 1211 sm->wpa_auth->addr, 5, 1212 parse.mdie - 2, parse.mdie_len + 2, 1213 parse.ftie - 2, parse.ftie_len + 2, 1214 parse.rsn - 2, parse.rsn_len + 2, 1215 parse.ric, parse.ric_len, 1216 mic) < 0) { 1217 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1218 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1219 } 1220 1221 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) { 1222 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1223 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1224 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1225 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", 1226 ftie->mic, mic_len); 1227 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len); 1228 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", 1229 parse.mdie - 2, parse.mdie_len + 2); 1230 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", 1231 parse.ftie - 2, parse.ftie_len + 2); 1232 wpa_hexdump(MSG_MSGDUMP, "FT: RSN", 1233 parse.rsn - 2, parse.rsn_len + 2); 1234 return WLAN_STATUS_INVALID_FTIE; 1235 } 1236 1237 return WLAN_STATUS_SUCCESS; 1238 } 1239 1240 1241 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1242 { 1243 const u8 *sta_addr, *target_ap; 1244 const u8 *ies; 1245 size_t ies_len; 1246 u8 action; 1247 struct ft_rrb_frame *frame; 1248 1249 if (sm == NULL) 1250 return -1; 1251 1252 /* 1253 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1254 * FT Request action frame body[variable] 1255 */ 1256 1257 if (len < 14) { 1258 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1259 "(len=%lu)", (unsigned long) len); 1260 return -1; 1261 } 1262 1263 action = data[1]; 1264 sta_addr = data + 2; 1265 target_ap = data + 8; 1266 ies = data + 14; 1267 ies_len = len - 14; 1268 1269 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1270 " Target AP=" MACSTR " Action=%d)", 1271 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1272 1273 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1274 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1275 "STA=" MACSTR " STA-Address=" MACSTR, 1276 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1277 return -1; 1278 } 1279 1280 /* 1281 * Do some sanity checking on the target AP address (not own and not 1282 * broadcast. This could be extended to filter based on a list of known 1283 * APs in the MD (if such a list were configured). 1284 */ 1285 if ((target_ap[0] & 0x01) || 1286 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1287 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1288 "frame"); 1289 return -1; 1290 } 1291 1292 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1293 1294 if (!sm->wpa_auth->conf.ft_over_ds) { 1295 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject"); 1296 return -1; 1297 } 1298 1299 /* RRB - Forward action frame to the target AP */ 1300 frame = os_malloc(sizeof(*frame) + len); 1301 if (frame == NULL) 1302 return -1; 1303 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1304 frame->packet_type = FT_PACKET_REQUEST; 1305 frame->action_length = host_to_le16(len); 1306 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1307 os_memcpy(frame + 1, data, len); 1308 1309 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1310 sizeof(*frame) + len); 1311 os_free(frame); 1312 1313 return 0; 1314 } 1315 1316 1317 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid, 1318 u16 auth_transaction, u16 resp, 1319 const u8 *ies, size_t ies_len) 1320 { 1321 struct wpa_state_machine *sm = ctx; 1322 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR, 1323 MAC2STR(sm->addr)); 1324 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr, 1325 WLAN_STATUS_SUCCESS, ies, ies_len); 1326 } 1327 1328 1329 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1330 const u8 *current_ap, const u8 *sta_addr, 1331 const u8 *body, size_t len) 1332 { 1333 struct wpa_state_machine *sm; 1334 u16 status; 1335 u8 *resp_ies; 1336 size_t resp_ies_len; 1337 int res; 1338 1339 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1340 if (sm == NULL) { 1341 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1342 "RRB Request"); 1343 return -1; 1344 } 1345 1346 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1347 1348 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb; 1349 sm->ft_pending_cb_ctx = sm; 1350 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN); 1351 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1352 &resp_ies_len); 1353 if (res < 0) { 1354 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response"); 1355 return 0; 1356 } 1357 status = res; 1358 1359 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status, 1360 resp_ies, resp_ies_len); 1361 os_free(resp_ies); 1362 return res; 1363 } 1364 1365 1366 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 1367 const u8 *current_ap, const u8 *sta_addr, 1368 u16 status, const u8 *resp_ies, 1369 size_t resp_ies_len) 1370 { 1371 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 1372 size_t rlen; 1373 struct ft_rrb_frame *frame; 1374 u8 *pos; 1375 1376 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1377 " CurrentAP=" MACSTR " status=%d", 1378 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1379 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1380 1381 /* RRB - Forward action frame response to the Current AP */ 1382 1383 /* 1384 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1385 * Status_Code[2] FT Request action frame body[variable] 1386 */ 1387 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1388 1389 frame = os_malloc(sizeof(*frame) + rlen); 1390 if (frame == NULL) 1391 return -1; 1392 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1393 frame->packet_type = FT_PACKET_RESPONSE; 1394 frame->action_length = host_to_le16(rlen); 1395 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1396 pos = (u8 *) (frame + 1); 1397 *pos++ = WLAN_ACTION_FT; 1398 *pos++ = 2; /* Action: Response */ 1399 os_memcpy(pos, sta_addr, ETH_ALEN); 1400 pos += ETH_ALEN; 1401 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1402 pos += ETH_ALEN; 1403 WPA_PUT_LE16(pos, status); 1404 pos += 2; 1405 if (resp_ies) 1406 os_memcpy(pos, resp_ies, resp_ies_len); 1407 1408 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1409 sizeof(*frame) + rlen); 1410 os_free(frame); 1411 1412 return 0; 1413 } 1414 1415 1416 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1417 const u8 *src_addr, 1418 const u8 *data, size_t data_len) 1419 { 1420 struct ft_r0kh_r1kh_pull_frame f; 1421 const u8 *crypt; 1422 u8 *plain; 1423 struct ft_remote_r1kh *r1kh; 1424 struct ft_r0kh_r1kh_resp_frame resp, r; 1425 u8 pmk_r0[PMK_LEN]; 1426 int pairwise; 1427 1428 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1429 1430 if (data_len < sizeof(f)) 1431 return -1; 1432 1433 r1kh = wpa_auth->conf.r1kh_list; 1434 while (r1kh) { 1435 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1436 break; 1437 r1kh = r1kh->next; 1438 } 1439 if (r1kh == NULL) { 1440 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1441 "PMK-R1 pull source address " MACSTR, 1442 MAC2STR(src_addr)); 1443 return -1; 1444 } 1445 1446 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1447 os_memset(&f, 0, sizeof(f)); 1448 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1449 /* aes_unwrap() does not support inplace decryption, so use a temporary 1450 * buffer for the data. */ 1451 if (aes_unwrap(r1kh->key, sizeof(r1kh->key), 1452 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1453 crypt, plain) < 0) { 1454 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1455 "request from " MACSTR, MAC2STR(src_addr)); 1456 return -1; 1457 } 1458 1459 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1460 f.nonce, sizeof(f.nonce)); 1461 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1462 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1463 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1464 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1465 1466 os_memset(&resp, 0, sizeof(resp)); 1467 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1468 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1469 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1470 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1471 1472 /* aes_wrap() does not support inplace encryption, so use a temporary 1473 * buffer for the data. */ 1474 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1475 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1476 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1477 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1478 &pairwise) < 0) { 1479 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1480 "PMK-R1 pull"); 1481 return -1; 1482 } 1483 1484 if (wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1485 r.pmk_r1, r.pmk_r1_name) < 0) { 1486 os_memset(pmk_r0, 0, PMK_LEN); 1487 return -1; 1488 } 1489 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1490 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1491 WPA_PMK_NAME_LEN); 1492 r.pairwise = host_to_le16(pairwise); 1493 os_memset(r.pad, 0, sizeof(r.pad)); 1494 1495 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1496 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1497 r.nonce, resp.nonce) < 0) { 1498 os_memset(pmk_r0, 0, PMK_LEN); 1499 return -1; 1500 } 1501 1502 os_memset(pmk_r0, 0, PMK_LEN); 1503 1504 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1505 1506 return 0; 1507 } 1508 1509 1510 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx) 1511 { 1512 struct wpa_state_machine *sm = eloop_ctx; 1513 int res; 1514 u8 *resp_ies; 1515 size_t resp_ies_len; 1516 u16 status; 1517 1518 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), 1519 wpabuf_len(sm->ft_pending_req_ies), 1520 &resp_ies, &resp_ies_len); 1521 wpabuf_free(sm->ft_pending_req_ies); 1522 sm->ft_pending_req_ies = NULL; 1523 if (res < 0) 1524 res = WLAN_STATUS_UNSPECIFIED_FAILURE; 1525 status = res; 1526 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR 1527 " - status %u", MAC2STR(sm->addr), status); 1528 1529 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, 1530 sm->ft_pending_auth_transaction + 1, status, 1531 resp_ies, resp_ies_len); 1532 os_free(resp_ies); 1533 } 1534 1535 1536 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx) 1537 { 1538 struct ft_r0kh_r1kh_resp_frame *frame = ctx; 1539 1540 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0 || 1541 os_memcmp(frame->nonce, sm->ft_pending_pull_nonce, 1542 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0 || 1543 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) 1544 return 0; 1545 1546 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " 1547 MACSTR " - process from timeout", MAC2STR(sm->addr)); 1548 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL); 1549 return 1; 1550 } 1551 1552 1553 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1554 const u8 *src_addr, 1555 const u8 *data, size_t data_len) 1556 { 1557 struct ft_r0kh_r1kh_resp_frame f; 1558 const u8 *crypt; 1559 u8 *plain; 1560 struct ft_remote_r0kh *r0kh; 1561 int pairwise, res; 1562 1563 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1564 1565 if (data_len < sizeof(f)) 1566 return -1; 1567 1568 r0kh = wpa_auth->conf.r0kh_list; 1569 while (r0kh) { 1570 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1571 break; 1572 r0kh = r0kh->next; 1573 } 1574 if (r0kh == NULL) { 1575 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1576 "PMK-R0 pull response source address " MACSTR, 1577 MAC2STR(src_addr)); 1578 return -1; 1579 } 1580 1581 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1582 os_memset(&f, 0, sizeof(f)); 1583 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1584 /* aes_unwrap() does not support inplace decryption, so use a temporary 1585 * buffer for the data. */ 1586 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1587 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1588 crypt, plain) < 0) { 1589 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1590 "response from " MACSTR, MAC2STR(src_addr)); 1591 return -1; 1592 } 1593 1594 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1595 FT_R1KH_ID_LEN) != 0) { 1596 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1597 "matching R1KH-ID"); 1598 return -1; 1599 } 1600 1601 pairwise = le_to_host16(f.pairwise); 1602 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1603 f.nonce, sizeof(f.nonce)); 1604 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1605 MACSTR " pairwise=0x%x", 1606 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1607 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1608 f.pmk_r1, PMK_LEN); 1609 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1610 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1611 1612 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1613 pairwise); 1614 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request"); 1615 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f); 1616 os_memset(f.pmk_r1, 0, PMK_LEN); 1617 1618 return res ? 0 : -1; 1619 } 1620 1621 1622 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1623 const u8 *src_addr, 1624 const u8 *data, size_t data_len) 1625 { 1626 struct ft_r0kh_r1kh_push_frame f; 1627 const u8 *crypt; 1628 u8 *plain; 1629 struct ft_remote_r0kh *r0kh; 1630 struct os_time now; 1631 os_time_t tsend; 1632 int pairwise; 1633 1634 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1635 1636 if (data_len < sizeof(f)) 1637 return -1; 1638 1639 r0kh = wpa_auth->conf.r0kh_list; 1640 while (r0kh) { 1641 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1642 break; 1643 r0kh = r0kh->next; 1644 } 1645 if (r0kh == NULL) { 1646 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1647 "PMK-R0 push source address " MACSTR, 1648 MAC2STR(src_addr)); 1649 return -1; 1650 } 1651 1652 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp); 1653 os_memset(&f, 0, sizeof(f)); 1654 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1655 timestamp); 1656 /* aes_unwrap() does not support inplace decryption, so use a temporary 1657 * buffer for the data. */ 1658 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1659 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1660 crypt, plain) < 0) { 1661 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1662 MACSTR, MAC2STR(src_addr)); 1663 return -1; 1664 } 1665 1666 os_get_time(&now); 1667 tsend = WPA_GET_LE32(f.timestamp); 1668 if ((now.sec > tsend && now.sec - tsend > 60) || 1669 (now.sec < tsend && tsend - now.sec > 60)) { 1670 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1671 "timestamp: sender time %d own time %d\n", 1672 (int) tsend, (int) now.sec); 1673 return -1; 1674 } 1675 1676 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1677 FT_R1KH_ID_LEN) != 0) { 1678 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1679 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1680 MAC2STR(f.r1kh_id), 1681 MAC2STR(wpa_auth->conf.r1_key_holder)); 1682 return -1; 1683 } 1684 1685 pairwise = le_to_host16(f.pairwise); 1686 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1687 MACSTR " pairwise=0x%x", 1688 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1689 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1690 f.pmk_r1, PMK_LEN); 1691 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1692 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1693 1694 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1695 pairwise); 1696 os_memset(f.pmk_r1, 0, PMK_LEN); 1697 1698 return 0; 1699 } 1700 1701 1702 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1703 const u8 *data, size_t data_len) 1704 { 1705 struct ft_rrb_frame *frame; 1706 u16 alen; 1707 const u8 *pos, *end, *start; 1708 u8 action; 1709 const u8 *sta_addr, *target_ap_addr; 1710 1711 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1712 MAC2STR(src_addr)); 1713 1714 if (data_len < sizeof(*frame)) { 1715 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1716 (unsigned long) data_len); 1717 return -1; 1718 } 1719 1720 pos = data; 1721 frame = (struct ft_rrb_frame *) pos; 1722 pos += sizeof(*frame); 1723 1724 alen = le_to_host16(frame->action_length); 1725 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1726 "action_length=%d ap_address=" MACSTR, 1727 frame->frame_type, frame->packet_type, alen, 1728 MAC2STR(frame->ap_address)); 1729 1730 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1731 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1732 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1733 "unrecognized type %d", frame->frame_type); 1734 return -1; 1735 } 1736 1737 if (alen > data_len - sizeof(*frame)) { 1738 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1739 "frame"); 1740 return -1; 1741 } 1742 1743 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1744 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1745 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1746 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1747 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1748 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1749 1750 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1751 1752 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1753 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1754 "room for Action Frame body); alen=%lu", 1755 (unsigned long) alen); 1756 return -1; 1757 } 1758 start = pos; 1759 end = pos + alen; 1760 1761 if (*pos != WLAN_ACTION_FT) { 1762 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1763 "%d", *pos); 1764 return -1; 1765 } 1766 1767 pos++; 1768 action = *pos++; 1769 sta_addr = pos; 1770 pos += ETH_ALEN; 1771 target_ap_addr = pos; 1772 pos += ETH_ALEN; 1773 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1774 MACSTR " target_ap_addr=" MACSTR, 1775 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1776 1777 if (frame->packet_type == FT_PACKET_REQUEST) { 1778 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1779 1780 if (action != 1) { 1781 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1782 "RRB Request", action); 1783 return -1; 1784 } 1785 1786 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1787 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1788 "RRB Request does not match with own " 1789 "address"); 1790 return -1; 1791 } 1792 1793 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1794 sta_addr, pos, end - pos) < 0) 1795 return -1; 1796 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1797 u16 status_code; 1798 1799 if (end - pos < 2) { 1800 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1801 "code in RRB Response"); 1802 return -1; 1803 } 1804 status_code = WPA_GET_LE16(pos); 1805 pos += 2; 1806 1807 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1808 "(status_code=%d)", status_code); 1809 1810 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1811 return -1; 1812 } else { 1813 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1814 "packet_type %d", frame->packet_type); 1815 return -1; 1816 } 1817 1818 if (end > pos) { 1819 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end", 1820 pos, end - pos); 1821 } 1822 1823 return 0; 1824 } 1825 1826 1827 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1828 struct wpa_ft_pmk_r0_sa *pmk_r0, 1829 struct ft_remote_r1kh *r1kh, 1830 const u8 *s1kh_id, int pairwise) 1831 { 1832 struct ft_r0kh_r1kh_push_frame frame, f; 1833 struct os_time now; 1834 const u8 *plain; 1835 u8 *crypt; 1836 1837 os_memset(&frame, 0, sizeof(frame)); 1838 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1839 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1840 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1841 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1842 1843 /* aes_wrap() does not support inplace encryption, so use a temporary 1844 * buffer for the data. */ 1845 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1846 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1847 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1848 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1849 s1kh_id, f.pmk_r1, f.pmk_r1_name) < 0) 1850 return -1; 1851 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1852 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1853 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1854 WPA_PMK_NAME_LEN); 1855 os_get_time(&now); 1856 WPA_PUT_LE32(f.timestamp, now.sec); 1857 f.pairwise = host_to_le16(pairwise); 1858 os_memset(f.pad, 0, sizeof(f.pad)); 1859 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1860 timestamp); 1861 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame, 1862 timestamp); 1863 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1864 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1865 plain, crypt) < 0) 1866 return -1; 1867 1868 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1869 return 0; 1870 } 1871 1872 1873 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1874 { 1875 struct wpa_ft_pmk_r0_sa *r0; 1876 struct ft_remote_r1kh *r1kh; 1877 1878 if (!wpa_auth->conf.pmk_r1_push) 1879 return; 1880 1881 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1882 while (r0) { 1883 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1884 break; 1885 r0 = r0->next; 1886 } 1887 1888 if (r0 == NULL || r0->pmk_r1_pushed) 1889 return; 1890 r0->pmk_r1_pushed = 1; 1891 1892 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1893 "for STA " MACSTR, MAC2STR(addr)); 1894 1895 r1kh = wpa_auth->conf.r1kh_list; 1896 while (r1kh) { 1897 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1898 r1kh = r1kh->next; 1899 } 1900 } 1901 1902 #endif /* CONFIG_IEEE80211R_AP */ 1903
