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 if (sm->tk_already_set) { 801 /* Must avoid TK reconfiguration to prevent clearing of TX/RX 802 * PN in the driver */ 803 wpa_printf(MSG_DEBUG, 804 "FT: Do not re-install same PTK to the driver"); 805 return; 806 } 807 808 /* FIX: add STA entry to kernel/driver here? The set_key will fail 809 * most likely without this.. At the moment, STA entry is added only 810 * after association has been completed. This function will be called 811 * again after association to get the PTK configured, but that could be 812 * optimized by adding the STA entry earlier. 813 */ 814 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 815 sm->PTK.tk, klen)) 816 return; 817 818 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 819 sm->pairwise_set = TRUE; 820 sm->tk_already_set = TRUE; 821 } 822 823 824 /* Derive PMK-R1 from PSK, check all available PSK */ 825 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm, 826 const u8 *req_pmk_r1_name, 827 u8 *out_pmk_r1, int *out_pairwise) 828 { 829 const u8 *pmk = NULL; 830 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 831 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 832 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 833 const u8 *mdid = wpa_auth->conf.mobility_domain; 834 const u8 *r0kh = sm->r0kh_id; 835 size_t r0kh_len = sm->r0kh_id_len; 836 const u8 *r1kh = wpa_auth->conf.r1_key_holder; 837 const u8 *ssid = wpa_auth->conf.ssid; 838 size_t ssid_len = wpa_auth->conf.ssid_len; 839 int pairwise; 840 841 pairwise = sm->pairwise; 842 843 for (;;) { 844 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr, 845 pmk); 846 if (pmk == NULL) 847 break; 848 849 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh, 850 r0kh_len, sm->addr, 851 pmk_r0, pmk_r0_name) < 0 || 852 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 853 pmk_r1, pmk_r1_name) < 0 || 854 os_memcmp_const(pmk_r1_name, req_pmk_r1_name, 855 WPA_PMK_NAME_LEN) != 0) 856 continue; 857 858 /* We found a PSK that matches the requested pmk_r1_name */ 859 wpa_printf(MSG_DEBUG, 860 "FT: Found PSK to generate PMK-R1 locally"); 861 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN); 862 if (out_pairwise) 863 *out_pairwise = pairwise; 864 return 0; 865 } 866 867 wpa_printf(MSG_DEBUG, 868 "FT: Did not find PSK to generate PMK-R1 locally"); 869 return -1; 870 } 871 872 873 /* Detect the configuration the station asked for. 874 * Required to detect FT-PSK and pairwise cipher. 875 */ 876 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm, 877 struct wpa_ft_ies *parse) 878 { 879 int key_mgmt, ciphers; 880 881 if (sm->wpa_key_mgmt) 882 return 0; 883 884 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt; 885 if (!key_mgmt) { 886 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from " 887 MACSTR, parse->key_mgmt, MAC2STR(sm->addr)); 888 return -1; 889 } 890 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) 891 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X; 892 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK) 893 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK; 894 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise; 895 if (!ciphers) { 896 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from " 897 MACSTR, 898 parse->pairwise_cipher, MAC2STR(sm->addr)); 899 return -1; 900 } 901 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0); 902 903 return 0; 904 } 905 906 907 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, 908 const u8 *ies, size_t ies_len, 909 u8 **resp_ies, size_t *resp_ies_len) 910 { 911 struct rsn_mdie *mdie; 912 struct rsn_ftie *ftie; 913 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 914 u8 ptk_name[WPA_PMK_NAME_LEN]; 915 struct wpa_auth_config *conf; 916 struct wpa_ft_ies parse; 917 size_t buflen; 918 int ret; 919 u8 *pos, *end; 920 int pairwise; 921 922 *resp_ies = NULL; 923 *resp_ies_len = 0; 924 925 sm->pmk_r1_name_valid = 0; 926 conf = &sm->wpa_auth->conf; 927 928 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 929 ies, ies_len); 930 931 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 932 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 933 return WLAN_STATUS_UNSPECIFIED_FAILURE; 934 } 935 936 mdie = (struct rsn_mdie *) parse.mdie; 937 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 938 os_memcmp(mdie->mobility_domain, 939 sm->wpa_auth->conf.mobility_domain, 940 MOBILITY_DOMAIN_ID_LEN) != 0) { 941 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 942 return WLAN_STATUS_INVALID_MDIE; 943 } 944 945 ftie = (struct rsn_ftie *) parse.ftie; 946 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 947 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 948 return WLAN_STATUS_INVALID_FTIE; 949 } 950 951 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 952 953 if (parse.r0kh_id == NULL) { 954 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 955 return WLAN_STATUS_INVALID_FTIE; 956 } 957 958 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 959 parse.r0kh_id, parse.r0kh_id_len); 960 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 961 sm->r0kh_id_len = parse.r0kh_id_len; 962 963 if (parse.rsn_pmkid == NULL) { 964 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 965 return WLAN_STATUS_INVALID_PMKID; 966 } 967 968 if (wpa_ft_set_key_mgmt(sm, &parse) < 0) 969 return WLAN_STATUS_UNSPECIFIED_FAILURE; 970 971 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 972 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 973 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid, 974 sm->wpa_auth->conf.r1_key_holder, sm->addr, 975 pmk_r1_name) < 0) 976 return WLAN_STATUS_UNSPECIFIED_FAILURE; 977 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 978 pmk_r1_name, WPA_PMK_NAME_LEN); 979 980 if (conf->ft_psk_generate_local && 981 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) { 982 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0) 983 return WLAN_STATUS_INVALID_PMKID; 984 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, 985 pmk_r1, &pairwise) < 0) { 986 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { 987 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 988 "PMK-R1 and unknown R0KH-ID"); 989 return WLAN_STATUS_INVALID_PMKID; 990 } 991 992 return -1; /* Status pending */ 993 } 994 995 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 996 sm->pmk_r1_name_valid = 1; 997 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 998 999 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 1000 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 1001 "ANonce"); 1002 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1003 } 1004 1005 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1006 sm->SNonce, WPA_NONCE_LEN); 1007 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 1008 sm->ANonce, WPA_NONCE_LEN); 1009 1010 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 1011 sm->wpa_auth->addr, pmk_r1_name, 1012 &sm->PTK, ptk_name, sm->wpa_key_mgmt, 1013 pairwise) < 0) 1014 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1015 1016 sm->pairwise = pairwise; 1017 sm->PTK_valid = TRUE; 1018 sm->tk_already_set = FALSE; 1019 wpa_ft_install_ptk(sm); 1020 1021 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 1022 2 + FT_R1KH_ID_LEN + 200; 1023 *resp_ies = os_zalloc(buflen); 1024 if (*resp_ies == NULL) 1025 goto fail; 1026 1027 pos = *resp_ies; 1028 end = *resp_ies + buflen; 1029 1030 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 1031 if (ret < 0) 1032 goto fail; 1033 pos += ret; 1034 1035 ret = wpa_write_mdie(conf, pos, end - pos); 1036 if (ret < 0) 1037 goto fail; 1038 pos += ret; 1039 1040 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 1041 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 1042 if (ret < 0) 1043 goto fail; 1044 pos += ret; 1045 1046 *resp_ies_len = pos - *resp_ies; 1047 1048 return WLAN_STATUS_SUCCESS; 1049 fail: 1050 os_free(*resp_ies); 1051 *resp_ies = NULL; 1052 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1053 } 1054 1055 1056 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 1057 u16 auth_transaction, const u8 *ies, size_t ies_len, 1058 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 1059 u16 auth_transaction, u16 status, 1060 const u8 *ies, size_t ies_len), 1061 void *ctx) 1062 { 1063 u16 status; 1064 u8 *resp_ies; 1065 size_t resp_ies_len; 1066 int res; 1067 1068 if (sm == NULL) { 1069 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 1070 "WPA SM not available"); 1071 return; 1072 } 1073 1074 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 1075 " BSSID=" MACSTR " transaction=%d", 1076 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 1077 sm->ft_pending_cb = cb; 1078 sm->ft_pending_cb_ctx = ctx; 1079 sm->ft_pending_auth_transaction = auth_transaction; 1080 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 1081 &resp_ies_len); 1082 if (res < 0) { 1083 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); 1084 return; 1085 } 1086 status = res; 1087 1088 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 1089 " auth_transaction=%d status=%d", 1090 MAC2STR(sm->addr), auth_transaction + 1, status); 1091 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1092 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 1093 resp_ies, resp_ies_len); 1094 os_free(resp_ies); 1095 } 1096 1097 1098 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 1099 size_t ies_len) 1100 { 1101 struct wpa_ft_ies parse; 1102 struct rsn_mdie *mdie; 1103 struct rsn_ftie *ftie; 1104 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1105 size_t mic_len = 16; 1106 unsigned int count; 1107 1108 if (sm == NULL) 1109 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1110 1111 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 1112 1113 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1114 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1115 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1116 } 1117 1118 if (parse.rsn == NULL) { 1119 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1120 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1121 } 1122 1123 if (parse.rsn_pmkid == NULL) { 1124 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1125 return WLAN_STATUS_INVALID_PMKID; 1126 } 1127 1128 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) 1129 != 0) { 1130 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1131 "with the PMKR1Name derived from auth request"); 1132 return WLAN_STATUS_INVALID_PMKID; 1133 } 1134 1135 mdie = (struct rsn_mdie *) parse.mdie; 1136 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1137 os_memcmp(mdie->mobility_domain, 1138 sm->wpa_auth->conf.mobility_domain, 1139 MOBILITY_DOMAIN_ID_LEN) != 0) { 1140 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1141 return WLAN_STATUS_INVALID_MDIE; 1142 } 1143 1144 ftie = (struct rsn_ftie *) parse.ftie; 1145 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1146 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1147 return WLAN_STATUS_INVALID_FTIE; 1148 } 1149 1150 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1151 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1152 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1153 ftie->snonce, WPA_NONCE_LEN); 1154 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1155 sm->SNonce, WPA_NONCE_LEN); 1156 return WLAN_STATUS_INVALID_FTIE; 1157 } 1158 1159 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1160 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1161 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1162 ftie->anonce, WPA_NONCE_LEN); 1163 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1164 sm->ANonce, WPA_NONCE_LEN); 1165 return WLAN_STATUS_INVALID_FTIE; 1166 } 1167 1168 1169 if (parse.r0kh_id == NULL) { 1170 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1171 return WLAN_STATUS_INVALID_FTIE; 1172 } 1173 1174 if (parse.r0kh_id_len != sm->r0kh_id_len || 1175 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 1176 { 1177 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1178 "the current R0KH-ID"); 1179 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1180 parse.r0kh_id, parse.r0kh_id_len); 1181 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1182 sm->r0kh_id, sm->r0kh_id_len); 1183 return WLAN_STATUS_INVALID_FTIE; 1184 } 1185 1186 if (parse.r1kh_id == NULL) { 1187 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1188 return WLAN_STATUS_INVALID_FTIE; 1189 } 1190 1191 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1192 FT_R1KH_ID_LEN) != 0) { 1193 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1194 "ReassocReq"); 1195 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1196 parse.r1kh_id, FT_R1KH_ID_LEN); 1197 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1198 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1199 return WLAN_STATUS_INVALID_FTIE; 1200 } 1201 1202 if (parse.rsn_pmkid == NULL || 1203 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 1204 { 1205 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1206 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1207 return WLAN_STATUS_INVALID_PMKID; 1208 } 1209 1210 count = 3; 1211 if (parse.ric) 1212 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1213 if (ftie->mic_control[1] != count) { 1214 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1215 "Control: received %u expected %u", 1216 ftie->mic_control[1], count); 1217 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1218 } 1219 1220 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 1221 sm->wpa_auth->addr, 5, 1222 parse.mdie - 2, parse.mdie_len + 2, 1223 parse.ftie - 2, parse.ftie_len + 2, 1224 parse.rsn - 2, parse.rsn_len + 2, 1225 parse.ric, parse.ric_len, 1226 mic) < 0) { 1227 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1228 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1229 } 1230 1231 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) { 1232 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1233 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1234 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1235 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", 1236 ftie->mic, mic_len); 1237 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len); 1238 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", 1239 parse.mdie - 2, parse.mdie_len + 2); 1240 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", 1241 parse.ftie - 2, parse.ftie_len + 2); 1242 wpa_hexdump(MSG_MSGDUMP, "FT: RSN", 1243 parse.rsn - 2, parse.rsn_len + 2); 1244 return WLAN_STATUS_INVALID_FTIE; 1245 } 1246 1247 return WLAN_STATUS_SUCCESS; 1248 } 1249 1250 1251 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1252 { 1253 const u8 *sta_addr, *target_ap; 1254 const u8 *ies; 1255 size_t ies_len; 1256 u8 action; 1257 struct ft_rrb_frame *frame; 1258 1259 if (sm == NULL) 1260 return -1; 1261 1262 /* 1263 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1264 * FT Request action frame body[variable] 1265 */ 1266 1267 if (len < 14) { 1268 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1269 "(len=%lu)", (unsigned long) len); 1270 return -1; 1271 } 1272 1273 action = data[1]; 1274 sta_addr = data + 2; 1275 target_ap = data + 8; 1276 ies = data + 14; 1277 ies_len = len - 14; 1278 1279 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1280 " Target AP=" MACSTR " Action=%d)", 1281 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1282 1283 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1284 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1285 "STA=" MACSTR " STA-Address=" MACSTR, 1286 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1287 return -1; 1288 } 1289 1290 /* 1291 * Do some sanity checking on the target AP address (not own and not 1292 * broadcast. This could be extended to filter based on a list of known 1293 * APs in the MD (if such a list were configured). 1294 */ 1295 if ((target_ap[0] & 0x01) || 1296 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1297 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1298 "frame"); 1299 return -1; 1300 } 1301 1302 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1303 1304 if (!sm->wpa_auth->conf.ft_over_ds) { 1305 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject"); 1306 return -1; 1307 } 1308 1309 /* RRB - Forward action frame to the target AP */ 1310 frame = os_malloc(sizeof(*frame) + len); 1311 if (frame == NULL) 1312 return -1; 1313 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1314 frame->packet_type = FT_PACKET_REQUEST; 1315 frame->action_length = host_to_le16(len); 1316 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1317 os_memcpy(frame + 1, data, len); 1318 1319 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1320 sizeof(*frame) + len); 1321 os_free(frame); 1322 1323 return 0; 1324 } 1325 1326 1327 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid, 1328 u16 auth_transaction, u16 resp, 1329 const u8 *ies, size_t ies_len) 1330 { 1331 struct wpa_state_machine *sm = ctx; 1332 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR, 1333 MAC2STR(sm->addr)); 1334 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr, 1335 WLAN_STATUS_SUCCESS, ies, ies_len); 1336 } 1337 1338 1339 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1340 const u8 *current_ap, const u8 *sta_addr, 1341 const u8 *body, size_t len) 1342 { 1343 struct wpa_state_machine *sm; 1344 u16 status; 1345 u8 *resp_ies; 1346 size_t resp_ies_len; 1347 int res; 1348 1349 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1350 if (sm == NULL) { 1351 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1352 "RRB Request"); 1353 return -1; 1354 } 1355 1356 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1357 1358 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb; 1359 sm->ft_pending_cb_ctx = sm; 1360 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN); 1361 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1362 &resp_ies_len); 1363 if (res < 0) { 1364 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response"); 1365 return 0; 1366 } 1367 status = res; 1368 1369 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status, 1370 resp_ies, resp_ies_len); 1371 os_free(resp_ies); 1372 return res; 1373 } 1374 1375 1376 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 1377 const u8 *current_ap, const u8 *sta_addr, 1378 u16 status, const u8 *resp_ies, 1379 size_t resp_ies_len) 1380 { 1381 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 1382 size_t rlen; 1383 struct ft_rrb_frame *frame; 1384 u8 *pos; 1385 1386 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1387 " CurrentAP=" MACSTR " status=%d", 1388 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1389 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1390 1391 /* RRB - Forward action frame response to the Current AP */ 1392 1393 /* 1394 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1395 * Status_Code[2] FT Request action frame body[variable] 1396 */ 1397 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1398 1399 frame = os_malloc(sizeof(*frame) + rlen); 1400 if (frame == NULL) 1401 return -1; 1402 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1403 frame->packet_type = FT_PACKET_RESPONSE; 1404 frame->action_length = host_to_le16(rlen); 1405 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1406 pos = (u8 *) (frame + 1); 1407 *pos++ = WLAN_ACTION_FT; 1408 *pos++ = 2; /* Action: Response */ 1409 os_memcpy(pos, sta_addr, ETH_ALEN); 1410 pos += ETH_ALEN; 1411 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1412 pos += ETH_ALEN; 1413 WPA_PUT_LE16(pos, status); 1414 pos += 2; 1415 if (resp_ies) 1416 os_memcpy(pos, resp_ies, resp_ies_len); 1417 1418 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1419 sizeof(*frame) + rlen); 1420 os_free(frame); 1421 1422 return 0; 1423 } 1424 1425 1426 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1427 const u8 *src_addr, 1428 const u8 *data, size_t data_len) 1429 { 1430 struct ft_r0kh_r1kh_pull_frame f; 1431 const u8 *crypt; 1432 u8 *plain; 1433 struct ft_remote_r1kh *r1kh; 1434 struct ft_r0kh_r1kh_resp_frame resp, r; 1435 u8 pmk_r0[PMK_LEN]; 1436 int pairwise; 1437 1438 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1439 1440 if (data_len < sizeof(f)) 1441 return -1; 1442 1443 r1kh = wpa_auth->conf.r1kh_list; 1444 while (r1kh) { 1445 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1446 break; 1447 r1kh = r1kh->next; 1448 } 1449 if (r1kh == NULL) { 1450 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1451 "PMK-R1 pull source address " MACSTR, 1452 MAC2STR(src_addr)); 1453 return -1; 1454 } 1455 1456 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1457 os_memset(&f, 0, sizeof(f)); 1458 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1459 /* aes_unwrap() does not support inplace decryption, so use a temporary 1460 * buffer for the data. */ 1461 if (aes_unwrap(r1kh->key, sizeof(r1kh->key), 1462 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1463 crypt, plain) < 0) { 1464 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1465 "request from " MACSTR, MAC2STR(src_addr)); 1466 return -1; 1467 } 1468 1469 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1470 f.nonce, sizeof(f.nonce)); 1471 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1472 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1473 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1474 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1475 1476 os_memset(&resp, 0, sizeof(resp)); 1477 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1478 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1479 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1480 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1481 1482 /* aes_wrap() does not support inplace encryption, so use a temporary 1483 * buffer for the data. */ 1484 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1485 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1486 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1487 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1488 &pairwise) < 0) { 1489 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1490 "PMK-R1 pull"); 1491 return -1; 1492 } 1493 1494 if (wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1495 r.pmk_r1, r.pmk_r1_name) < 0) { 1496 os_memset(pmk_r0, 0, PMK_LEN); 1497 return -1; 1498 } 1499 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1500 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1501 WPA_PMK_NAME_LEN); 1502 r.pairwise = host_to_le16(pairwise); 1503 os_memset(r.pad, 0, sizeof(r.pad)); 1504 1505 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1506 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1507 r.nonce, resp.nonce) < 0) { 1508 os_memset(pmk_r0, 0, PMK_LEN); 1509 return -1; 1510 } 1511 1512 os_memset(pmk_r0, 0, PMK_LEN); 1513 1514 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1515 1516 return 0; 1517 } 1518 1519 1520 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx) 1521 { 1522 struct wpa_state_machine *sm = eloop_ctx; 1523 int res; 1524 u8 *resp_ies; 1525 size_t resp_ies_len; 1526 u16 status; 1527 1528 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), 1529 wpabuf_len(sm->ft_pending_req_ies), 1530 &resp_ies, &resp_ies_len); 1531 wpabuf_free(sm->ft_pending_req_ies); 1532 sm->ft_pending_req_ies = NULL; 1533 if (res < 0) 1534 res = WLAN_STATUS_UNSPECIFIED_FAILURE; 1535 status = res; 1536 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR 1537 " - status %u", MAC2STR(sm->addr), status); 1538 1539 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, 1540 sm->ft_pending_auth_transaction + 1, status, 1541 resp_ies, resp_ies_len); 1542 os_free(resp_ies); 1543 } 1544 1545 1546 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx) 1547 { 1548 struct ft_r0kh_r1kh_resp_frame *frame = ctx; 1549 1550 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0 || 1551 os_memcmp(frame->nonce, sm->ft_pending_pull_nonce, 1552 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0 || 1553 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) 1554 return 0; 1555 1556 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " 1557 MACSTR " - process from timeout", MAC2STR(sm->addr)); 1558 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL); 1559 return 1; 1560 } 1561 1562 1563 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1564 const u8 *src_addr, 1565 const u8 *data, size_t data_len) 1566 { 1567 struct ft_r0kh_r1kh_resp_frame f; 1568 const u8 *crypt; 1569 u8 *plain; 1570 struct ft_remote_r0kh *r0kh; 1571 int pairwise, res; 1572 1573 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1574 1575 if (data_len < sizeof(f)) 1576 return -1; 1577 1578 r0kh = wpa_auth->conf.r0kh_list; 1579 while (r0kh) { 1580 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1581 break; 1582 r0kh = r0kh->next; 1583 } 1584 if (r0kh == NULL) { 1585 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1586 "PMK-R0 pull response source address " MACSTR, 1587 MAC2STR(src_addr)); 1588 return -1; 1589 } 1590 1591 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1592 os_memset(&f, 0, sizeof(f)); 1593 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1594 /* aes_unwrap() does not support inplace decryption, so use a temporary 1595 * buffer for the data. */ 1596 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1597 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1598 crypt, plain) < 0) { 1599 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1600 "response from " MACSTR, MAC2STR(src_addr)); 1601 return -1; 1602 } 1603 1604 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1605 FT_R1KH_ID_LEN) != 0) { 1606 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1607 "matching R1KH-ID"); 1608 return -1; 1609 } 1610 1611 pairwise = le_to_host16(f.pairwise); 1612 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1613 f.nonce, sizeof(f.nonce)); 1614 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1615 MACSTR " pairwise=0x%x", 1616 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1617 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1618 f.pmk_r1, PMK_LEN); 1619 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1620 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1621 1622 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1623 pairwise); 1624 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request"); 1625 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f); 1626 os_memset(f.pmk_r1, 0, PMK_LEN); 1627 1628 return res ? 0 : -1; 1629 } 1630 1631 1632 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1633 const u8 *src_addr, 1634 const u8 *data, size_t data_len) 1635 { 1636 struct ft_r0kh_r1kh_push_frame f; 1637 const u8 *crypt; 1638 u8 *plain; 1639 struct ft_remote_r0kh *r0kh; 1640 struct os_time now; 1641 os_time_t tsend; 1642 int pairwise; 1643 1644 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1645 1646 if (data_len < sizeof(f)) 1647 return -1; 1648 1649 r0kh = wpa_auth->conf.r0kh_list; 1650 while (r0kh) { 1651 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1652 break; 1653 r0kh = r0kh->next; 1654 } 1655 if (r0kh == NULL) { 1656 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1657 "PMK-R0 push source address " MACSTR, 1658 MAC2STR(src_addr)); 1659 return -1; 1660 } 1661 1662 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp); 1663 os_memset(&f, 0, sizeof(f)); 1664 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1665 timestamp); 1666 /* aes_unwrap() does not support inplace decryption, so use a temporary 1667 * buffer for the data. */ 1668 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1669 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1670 crypt, plain) < 0) { 1671 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1672 MACSTR, MAC2STR(src_addr)); 1673 return -1; 1674 } 1675 1676 os_get_time(&now); 1677 tsend = WPA_GET_LE32(f.timestamp); 1678 if ((now.sec > tsend && now.sec - tsend > 60) || 1679 (now.sec < tsend && tsend - now.sec > 60)) { 1680 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1681 "timestamp: sender time %d own time %d\n", 1682 (int) tsend, (int) now.sec); 1683 return -1; 1684 } 1685 1686 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1687 FT_R1KH_ID_LEN) != 0) { 1688 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1689 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1690 MAC2STR(f.r1kh_id), 1691 MAC2STR(wpa_auth->conf.r1_key_holder)); 1692 return -1; 1693 } 1694 1695 pairwise = le_to_host16(f.pairwise); 1696 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1697 MACSTR " pairwise=0x%x", 1698 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1699 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1700 f.pmk_r1, PMK_LEN); 1701 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1702 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1703 1704 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1705 pairwise); 1706 os_memset(f.pmk_r1, 0, PMK_LEN); 1707 1708 return 0; 1709 } 1710 1711 1712 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1713 const u8 *data, size_t data_len) 1714 { 1715 struct ft_rrb_frame *frame; 1716 u16 alen; 1717 const u8 *pos, *end, *start; 1718 u8 action; 1719 const u8 *sta_addr, *target_ap_addr; 1720 1721 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1722 MAC2STR(src_addr)); 1723 1724 if (data_len < sizeof(*frame)) { 1725 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1726 (unsigned long) data_len); 1727 return -1; 1728 } 1729 1730 pos = data; 1731 frame = (struct ft_rrb_frame *) pos; 1732 pos += sizeof(*frame); 1733 1734 alen = le_to_host16(frame->action_length); 1735 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1736 "action_length=%d ap_address=" MACSTR, 1737 frame->frame_type, frame->packet_type, alen, 1738 MAC2STR(frame->ap_address)); 1739 1740 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1741 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1742 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1743 "unrecognized type %d", frame->frame_type); 1744 return -1; 1745 } 1746 1747 if (alen > data_len - sizeof(*frame)) { 1748 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1749 "frame"); 1750 return -1; 1751 } 1752 1753 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1754 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1755 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1756 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1757 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1758 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1759 1760 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1761 1762 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1763 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1764 "room for Action Frame body); alen=%lu", 1765 (unsigned long) alen); 1766 return -1; 1767 } 1768 start = pos; 1769 end = pos + alen; 1770 1771 if (*pos != WLAN_ACTION_FT) { 1772 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1773 "%d", *pos); 1774 return -1; 1775 } 1776 1777 pos++; 1778 action = *pos++; 1779 sta_addr = pos; 1780 pos += ETH_ALEN; 1781 target_ap_addr = pos; 1782 pos += ETH_ALEN; 1783 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1784 MACSTR " target_ap_addr=" MACSTR, 1785 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1786 1787 if (frame->packet_type == FT_PACKET_REQUEST) { 1788 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1789 1790 if (action != 1) { 1791 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1792 "RRB Request", action); 1793 return -1; 1794 } 1795 1796 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1797 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1798 "RRB Request does not match with own " 1799 "address"); 1800 return -1; 1801 } 1802 1803 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1804 sta_addr, pos, end - pos) < 0) 1805 return -1; 1806 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1807 u16 status_code; 1808 1809 if (end - pos < 2) { 1810 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1811 "code in RRB Response"); 1812 return -1; 1813 } 1814 status_code = WPA_GET_LE16(pos); 1815 pos += 2; 1816 1817 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1818 "(status_code=%d)", status_code); 1819 1820 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1821 return -1; 1822 } else { 1823 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1824 "packet_type %d", frame->packet_type); 1825 return -1; 1826 } 1827 1828 if (end > pos) { 1829 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end", 1830 pos, end - pos); 1831 } 1832 1833 return 0; 1834 } 1835 1836 1837 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1838 struct wpa_ft_pmk_r0_sa *pmk_r0, 1839 struct ft_remote_r1kh *r1kh, 1840 const u8 *s1kh_id, int pairwise) 1841 { 1842 struct ft_r0kh_r1kh_push_frame frame, f; 1843 struct os_time now; 1844 const u8 *plain; 1845 u8 *crypt; 1846 1847 os_memset(&frame, 0, sizeof(frame)); 1848 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1849 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1850 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1851 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1852 1853 /* aes_wrap() does not support inplace encryption, so use a temporary 1854 * buffer for the data. */ 1855 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1856 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1857 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1858 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1859 s1kh_id, f.pmk_r1, f.pmk_r1_name) < 0) 1860 return -1; 1861 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1862 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1863 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1864 WPA_PMK_NAME_LEN); 1865 os_get_time(&now); 1866 WPA_PUT_LE32(f.timestamp, now.sec); 1867 f.pairwise = host_to_le16(pairwise); 1868 os_memset(f.pad, 0, sizeof(f.pad)); 1869 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1870 timestamp); 1871 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame, 1872 timestamp); 1873 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1874 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1875 plain, crypt) < 0) 1876 return -1; 1877 1878 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1879 return 0; 1880 } 1881 1882 1883 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1884 { 1885 struct wpa_ft_pmk_r0_sa *r0; 1886 struct ft_remote_r1kh *r1kh; 1887 1888 if (!wpa_auth->conf.pmk_r1_push) 1889 return; 1890 1891 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1892 while (r0) { 1893 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1894 break; 1895 r0 = r0->next; 1896 } 1897 1898 if (r0 == NULL || r0->pmk_r1_pushed) 1899 return; 1900 r0->pmk_r1_pushed = 1; 1901 1902 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1903 "for STA " MACSTR, MAC2STR(addr)); 1904 1905 r1kh = wpa_auth->conf.r1kh_list; 1906 while (r1kh) { 1907 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1908 r1kh = r1kh->next; 1909 } 1910 } 1911 1912 #endif /* CONFIG_IEEE80211R_AP */ 1913
