1 /* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "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 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 struct wpa_state_machine * 55 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) 56 { 57 if (wpa_auth->cb.add_sta == NULL) 58 return NULL; 59 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr); 60 } 61 62 63 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth, 64 const u8 *sta_addr, 65 u8 *tspec_ie, size_t tspec_ielen) 66 { 67 if (wpa_auth->cb.add_tspec == NULL) { 68 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized"); 69 return -1; 70 } 71 return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie, 72 tspec_ielen); 73 } 74 75 76 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) 77 { 78 u8 *pos = buf; 79 u8 capab; 80 if (len < 2 + sizeof(struct rsn_mdie)) 81 return -1; 82 83 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 84 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; 85 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 86 pos += MOBILITY_DOMAIN_ID_LEN; 87 capab = 0; 88 if (conf->ft_over_ds) 89 capab |= RSN_FT_CAPAB_FT_OVER_DS; 90 *pos++ = capab; 91 92 return pos - buf; 93 } 94 95 96 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, 97 size_t r0kh_id_len, 98 const u8 *anonce, const u8 *snonce, 99 u8 *buf, size_t len, const u8 *subelem, 100 size_t subelem_len) 101 { 102 u8 *pos = buf, *ielen; 103 struct rsn_ftie *hdr; 104 105 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + 106 subelem_len) 107 return -1; 108 109 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 110 ielen = pos++; 111 112 hdr = (struct rsn_ftie *) pos; 113 os_memset(hdr, 0, sizeof(*hdr)); 114 pos += sizeof(*hdr); 115 WPA_PUT_LE16(hdr->mic_control, 0); 116 if (anonce) 117 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); 118 if (snonce) 119 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); 120 121 /* Optional Parameters */ 122 *pos++ = FTIE_SUBELEM_R1KH_ID; 123 *pos++ = FT_R1KH_ID_LEN; 124 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); 125 pos += FT_R1KH_ID_LEN; 126 127 if (r0kh_id) { 128 *pos++ = FTIE_SUBELEM_R0KH_ID; 129 *pos++ = r0kh_id_len; 130 os_memcpy(pos, r0kh_id, r0kh_id_len); 131 pos += r0kh_id_len; 132 } 133 134 if (subelem) { 135 os_memcpy(pos, subelem, subelem_len); 136 pos += subelem_len; 137 } 138 139 *ielen = pos - buf - 2; 140 141 return pos - buf; 142 } 143 144 145 struct wpa_ft_pmk_r0_sa { 146 struct wpa_ft_pmk_r0_sa *next; 147 u8 pmk_r0[PMK_LEN]; 148 u8 pmk_r0_name[WPA_PMK_NAME_LEN]; 149 u8 spa[ETH_ALEN]; 150 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 151 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 152 int pmk_r1_pushed; 153 }; 154 155 struct wpa_ft_pmk_r1_sa { 156 struct wpa_ft_pmk_r1_sa *next; 157 u8 pmk_r1[PMK_LEN]; 158 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 159 u8 spa[ETH_ALEN]; 160 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 161 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 162 }; 163 164 struct wpa_ft_pmk_cache { 165 struct wpa_ft_pmk_r0_sa *pmk_r0; 166 struct wpa_ft_pmk_r1_sa *pmk_r1; 167 }; 168 169 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) 170 { 171 struct wpa_ft_pmk_cache *cache; 172 173 cache = os_zalloc(sizeof(*cache)); 174 175 return cache; 176 } 177 178 179 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) 180 { 181 struct wpa_ft_pmk_r0_sa *r0, *r0prev; 182 struct wpa_ft_pmk_r1_sa *r1, *r1prev; 183 184 r0 = cache->pmk_r0; 185 while (r0) { 186 r0prev = r0; 187 r0 = r0->next; 188 os_memset(r0prev->pmk_r0, 0, PMK_LEN); 189 os_free(r0prev); 190 } 191 192 r1 = cache->pmk_r1; 193 while (r1) { 194 r1prev = r1; 195 r1 = r1->next; 196 os_memset(r1prev->pmk_r1, 0, PMK_LEN); 197 os_free(r1prev); 198 } 199 200 os_free(cache); 201 } 202 203 204 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, 205 const u8 *spa, const u8 *pmk_r0, 206 const u8 *pmk_r0_name, int pairwise) 207 { 208 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 209 struct wpa_ft_pmk_r0_sa *r0; 210 211 /* TODO: add expiration and limit on number of entries in cache */ 212 213 r0 = os_zalloc(sizeof(*r0)); 214 if (r0 == NULL) 215 return -1; 216 217 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); 218 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 219 os_memcpy(r0->spa, spa, ETH_ALEN); 220 r0->pairwise = pairwise; 221 222 r0->next = cache->pmk_r0; 223 cache->pmk_r0 = r0; 224 225 return 0; 226 } 227 228 229 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, 230 const u8 *spa, const u8 *pmk_r0_name, 231 u8 *pmk_r0, int *pairwise) 232 { 233 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 234 struct wpa_ft_pmk_r0_sa *r0; 235 236 r0 = cache->pmk_r0; 237 while (r0) { 238 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && 239 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name, 240 WPA_PMK_NAME_LEN) == 0) { 241 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); 242 if (pairwise) 243 *pairwise = r0->pairwise; 244 return 0; 245 } 246 247 r0 = r0->next; 248 } 249 250 return -1; 251 } 252 253 254 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, 255 const u8 *spa, const u8 *pmk_r1, 256 const u8 *pmk_r1_name, int pairwise) 257 { 258 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 259 struct wpa_ft_pmk_r1_sa *r1; 260 261 /* TODO: add expiration and limit on number of entries in cache */ 262 263 r1 = os_zalloc(sizeof(*r1)); 264 if (r1 == NULL) 265 return -1; 266 267 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); 268 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 269 os_memcpy(r1->spa, spa, ETH_ALEN); 270 r1->pairwise = pairwise; 271 272 r1->next = cache->pmk_r1; 273 cache->pmk_r1 = r1; 274 275 return 0; 276 } 277 278 279 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, 280 const u8 *spa, const u8 *pmk_r1_name, 281 u8 *pmk_r1, int *pairwise) 282 { 283 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 284 struct wpa_ft_pmk_r1_sa *r1; 285 286 r1 = cache->pmk_r1; 287 while (r1) { 288 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && 289 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name, 290 WPA_PMK_NAME_LEN) == 0) { 291 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); 292 if (pairwise) 293 *pairwise = r1->pairwise; 294 return 0; 295 } 296 297 r1 = r1->next; 298 } 299 300 return -1; 301 } 302 303 304 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm, 305 const u8 *ies, size_t ies_len, 306 const u8 *pmk_r0_name) 307 { 308 struct ft_remote_r0kh *r0kh; 309 struct ft_r0kh_r1kh_pull_frame frame, f; 310 311 r0kh = sm->wpa_auth->conf.r0kh_list; 312 while (r0kh) { 313 if (r0kh->id_len == sm->r0kh_id_len && 314 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) == 315 0) 316 break; 317 r0kh = r0kh->next; 318 } 319 if (r0kh == NULL) { 320 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID", 321 sm->r0kh_id, sm->r0kh_id_len); 322 return -1; 323 } 324 325 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 326 "address " MACSTR, MAC2STR(r0kh->addr)); 327 328 os_memset(&frame, 0, sizeof(frame)); 329 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 330 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 331 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 332 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN); 333 334 /* aes_wrap() does not support inplace encryption, so use a temporary 335 * buffer for the data. */ 336 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) { 337 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 338 "nonce"); 339 return -1; 340 } 341 os_memcpy(sm->ft_pending_pull_nonce, f.nonce, 342 FT_R0KH_R1KH_PULL_NONCE_LEN); 343 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 344 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 345 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN); 346 os_memset(f.pad, 0, sizeof(f.pad)); 347 348 if (aes_wrap(r0kh->key, sizeof(r0kh->key), 349 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 350 f.nonce, frame.nonce) < 0) 351 return -1; 352 353 wpabuf_free(sm->ft_pending_req_ies); 354 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len); 355 if (sm->ft_pending_req_ies == NULL) 356 return -1; 357 358 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 359 360 return 0; 361 } 362 363 364 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 365 struct wpa_ptk *ptk) 366 { 367 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 368 u8 pmk_r1[PMK_LEN]; 369 u8 ptk_name[WPA_PMK_NAME_LEN]; 370 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 371 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 372 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 373 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 374 const u8 *ssid = sm->wpa_auth->conf.ssid; 375 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 376 377 if (sm->xxkey_len == 0) { 378 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 379 "derivation"); 380 return -1; 381 } 382 383 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 384 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); 385 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 386 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 387 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 388 sm->pairwise); 389 390 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 391 pmk_r1, sm->pmk_r1_name); 392 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 393 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 394 WPA_PMK_NAME_LEN); 395 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name, 396 sm->pairwise); 397 398 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 399 sm->wpa_auth->addr, sm->pmk_r1_name, 400 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise); 401 } 402 403 404 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 405 const u8 *addr, int idx, u8 *seq) 406 { 407 if (wpa_auth->cb.get_seqnum == NULL) 408 return -1; 409 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 410 } 411 412 413 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 414 { 415 u8 *subelem; 416 struct wpa_group *gsm = sm->group; 417 size_t subelem_len, pad_len; 418 const u8 *key; 419 size_t key_len; 420 u8 keybuf[32]; 421 422 key_len = gsm->GTK_len; 423 if (key_len > sizeof(keybuf)) 424 return NULL; 425 426 /* 427 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 428 * than 16 bytes. 429 */ 430 pad_len = key_len % 8; 431 if (pad_len) 432 pad_len = 8 - pad_len; 433 if (key_len + pad_len < 16) 434 pad_len += 8; 435 if (pad_len && key_len < sizeof(keybuf)) { 436 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 437 os_memset(keybuf + key_len, 0, pad_len); 438 keybuf[key_len] = 0xdd; 439 key_len += pad_len; 440 key = keybuf; 441 } else 442 key = gsm->GTK[gsm->GN - 1]; 443 444 /* 445 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 446 * Key[5..32]. 447 */ 448 subelem_len = 13 + key_len + 8; 449 subelem = os_zalloc(subelem_len); 450 if (subelem == NULL) 451 return NULL; 452 453 subelem[0] = FTIE_SUBELEM_GTK; 454 subelem[1] = 11 + key_len + 8; 455 /* Key ID in B0-B1 of Key Info */ 456 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 457 subelem[4] = gsm->GTK_len; 458 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 459 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key, 460 subelem + 13)) { 461 os_free(subelem); 462 return NULL; 463 } 464 465 *len = subelem_len; 466 return subelem; 467 } 468 469 470 #ifdef CONFIG_IEEE80211W 471 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 472 { 473 u8 *subelem, *pos; 474 struct wpa_group *gsm = sm->group; 475 size_t subelem_len; 476 477 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 478 * Key[16+8] */ 479 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 480 subelem = os_zalloc(subelem_len); 481 if (subelem == NULL) 482 return NULL; 483 484 pos = subelem; 485 *pos++ = FTIE_SUBELEM_IGTK; 486 *pos++ = subelem_len - 2; 487 WPA_PUT_LE16(pos, gsm->GN_igtk); 488 pos += 2; 489 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 490 pos += 6; 491 *pos++ = WPA_IGTK_LEN; 492 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8, 493 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 494 os_free(subelem); 495 return NULL; 496 } 497 498 *len = subelem_len; 499 return subelem; 500 } 501 #endif /* CONFIG_IEEE80211W */ 502 503 504 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm, 505 u8 *pos, u8 *end, u8 id, u8 descr_count, 506 const u8 *ies, size_t ies_len) 507 { 508 struct ieee802_11_elems parse; 509 struct rsn_rdie *rdie; 510 511 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 512 id, descr_count); 513 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 514 ies, ies_len); 515 516 if (end - pos < (int) sizeof(*rdie)) { 517 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 518 return pos; 519 } 520 521 *pos++ = WLAN_EID_RIC_DATA; 522 *pos++ = sizeof(*rdie); 523 rdie = (struct rsn_rdie *) pos; 524 rdie->id = id; 525 rdie->descr_count = 0; 526 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 527 pos += sizeof(*rdie); 528 529 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 530 ParseFailed) { 531 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 532 rdie->status_code = 533 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 534 return pos; 535 } 536 537 #ifdef NEED_AP_MLME 538 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { 539 struct wmm_tspec_element *tspec; 540 int res; 541 542 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 543 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 544 "(%d)", (int) parse.wmm_tspec_len); 545 rdie->status_code = 546 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 547 return pos; 548 } 549 if (end - pos < (int) sizeof(*tspec)) { 550 wpa_printf(MSG_ERROR, "FT: Not enough room for " 551 "response TSPEC"); 552 rdie->status_code = 553 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 554 return pos; 555 } 556 tspec = (struct wmm_tspec_element *) pos; 557 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 558 res = wmm_process_tspec(tspec); 559 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 560 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 561 rdie->status_code = 562 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 563 else if (res == WMM_ADDTS_STATUS_REFUSED) 564 rdie->status_code = 565 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 566 else { 567 /* TSPEC accepted; include updated TSPEC in response */ 568 rdie->descr_count = 1; 569 pos += sizeof(*tspec); 570 } 571 return pos; 572 } 573 #endif /* NEED_AP_MLME */ 574 575 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { 576 struct wmm_tspec_element *tspec; 577 int res; 578 579 tspec = (struct wmm_tspec_element *) pos; 580 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 581 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, 582 sizeof(*tspec)); 583 if (res >= 0) { 584 if (res) 585 rdie->status_code = host_to_le16(res); 586 else { 587 /* TSPEC accepted; include updated TSPEC in 588 * response */ 589 rdie->descr_count = 1; 590 pos += sizeof(*tspec); 591 } 592 return pos; 593 } 594 } 595 596 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 597 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 598 return pos; 599 } 600 601 602 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, 603 const u8 *ric, size_t ric_len) 604 { 605 const u8 *rpos, *start; 606 const struct rsn_rdie *rdie; 607 608 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 609 610 rpos = ric; 611 while (rpos + sizeof(*rdie) < ric + ric_len) { 612 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 613 rpos + 2 + rpos[1] > ric + ric_len) 614 break; 615 rdie = (const struct rsn_rdie *) (rpos + 2); 616 rpos += 2 + rpos[1]; 617 start = rpos; 618 619 while (rpos + 2 <= ric + ric_len && 620 rpos + 2 + rpos[1] <= ric + ric_len) { 621 if (rpos[0] == WLAN_EID_RIC_DATA) 622 break; 623 rpos += 2 + rpos[1]; 624 } 625 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, 626 rdie->descr_count, 627 start, rpos - start); 628 } 629 630 return pos; 631 } 632 633 634 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 635 size_t max_len, int auth_alg, 636 const u8 *req_ies, size_t req_ies_len) 637 { 638 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 639 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 640 int res; 641 struct wpa_auth_config *conf; 642 struct rsn_ftie *_ftie; 643 struct wpa_ft_ies parse; 644 u8 *ric_start; 645 u8 *anonce, *snonce; 646 647 if (sm == NULL) 648 return pos; 649 650 conf = &sm->wpa_auth->conf; 651 652 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 653 return pos; 654 655 end = pos + max_len; 656 657 if (auth_alg == WLAN_AUTH_FT) { 658 /* 659 * RSN (only present if this is a Reassociation Response and 660 * part of a fast BSS transition) 661 */ 662 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 663 if (res < 0) 664 return pos; 665 rsnie = pos; 666 rsnie_len = res; 667 pos += res; 668 } 669 670 /* Mobility Domain Information */ 671 res = wpa_write_mdie(conf, pos, end - pos); 672 if (res < 0) 673 return pos; 674 mdie = pos; 675 mdie_len = res; 676 pos += res; 677 678 /* Fast BSS Transition Information */ 679 if (auth_alg == WLAN_AUTH_FT) { 680 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 681 r0kh_id = sm->r0kh_id; 682 r0kh_id_len = sm->r0kh_id_len; 683 anonce = sm->ANonce; 684 snonce = sm->SNonce; 685 #ifdef CONFIG_IEEE80211W 686 if (sm->mgmt_frame_prot) { 687 u8 *igtk; 688 size_t igtk_len; 689 u8 *nbuf; 690 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 691 if (igtk == NULL) { 692 os_free(subelem); 693 return pos; 694 } 695 nbuf = os_realloc(subelem, subelem_len + igtk_len); 696 if (nbuf == NULL) { 697 os_free(subelem); 698 os_free(igtk); 699 return pos; 700 } 701 subelem = nbuf; 702 os_memcpy(subelem + subelem_len, igtk, igtk_len); 703 subelem_len += igtk_len; 704 os_free(igtk); 705 } 706 #endif /* CONFIG_IEEE80211W */ 707 } else { 708 r0kh_id = conf->r0_key_holder; 709 r0kh_id_len = conf->r0_key_holder_len; 710 anonce = NULL; 711 snonce = NULL; 712 } 713 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 714 end - pos, subelem, subelem_len); 715 os_free(subelem); 716 if (res < 0) 717 return pos; 718 ftie = pos; 719 ftie_len = res; 720 pos += res; 721 722 os_free(sm->assoc_resp_ftie); 723 sm->assoc_resp_ftie = os_malloc(ftie_len); 724 if (sm->assoc_resp_ftie) 725 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 726 727 _ftie = (struct rsn_ftie *) (ftie + 2); 728 if (auth_alg == WLAN_AUTH_FT) 729 _ftie->mic_control[1] = 3; /* Information element count */ 730 731 ric_start = pos; 732 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 733 pos = wpa_ft_process_ric(sm, pos, end, parse.ric, 734 parse.ric_len); 735 if (auth_alg == WLAN_AUTH_FT) 736 _ftie->mic_control[1] += 737 ieee802_11_ie_count(ric_start, 738 pos - ric_start); 739 } 740 if (ric_start == pos) 741 ric_start = NULL; 742 743 if (auth_alg == WLAN_AUTH_FT && 744 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 745 sm->wpa_auth->addr, 6, 746 mdie, mdie_len, ftie, ftie_len, 747 rsnie, rsnie_len, 748 ric_start, ric_start ? pos - ric_start : 0, 749 _ftie->mic) < 0) 750 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 751 752 return pos; 753 } 754 755 756 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 757 int vlan_id, 758 enum wpa_alg alg, const u8 *addr, int idx, 759 u8 *key, size_t key_len) 760 { 761 if (wpa_auth->cb.set_key == NULL) 762 return -1; 763 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 764 key, key_len); 765 } 766 767 768 void wpa_ft_install_ptk(struct wpa_state_machine *sm) 769 { 770 enum wpa_alg alg; 771 int klen; 772 773 /* MLME-SETKEYS.request(PTK) */ 774 alg = wpa_cipher_to_alg(sm->pairwise); 775 klen = wpa_cipher_key_len(sm->pairwise); 776 if (!wpa_cipher_valid_pairwise(sm->pairwise)) { 777 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 778 "PTK configuration", sm->pairwise); 779 return; 780 } 781 782 /* FIX: add STA entry to kernel/driver here? The set_key will fail 783 * most likely without this.. At the moment, STA entry is added only 784 * after association has been completed. This function will be called 785 * again after association to get the PTK configured, but that could be 786 * optimized by adding the STA entry earlier. 787 */ 788 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 789 sm->PTK.tk, klen)) 790 return; 791 792 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 793 sm->pairwise_set = TRUE; 794 } 795 796 797 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, 798 const u8 *ies, size_t ies_len, 799 u8 **resp_ies, size_t *resp_ies_len) 800 { 801 struct rsn_mdie *mdie; 802 struct rsn_ftie *ftie; 803 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 804 u8 ptk_name[WPA_PMK_NAME_LEN]; 805 struct wpa_auth_config *conf; 806 struct wpa_ft_ies parse; 807 size_t buflen; 808 int ret; 809 u8 *pos, *end; 810 int pairwise; 811 812 *resp_ies = NULL; 813 *resp_ies_len = 0; 814 815 sm->pmk_r1_name_valid = 0; 816 conf = &sm->wpa_auth->conf; 817 818 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 819 ies, ies_len); 820 821 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 822 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 823 return WLAN_STATUS_UNSPECIFIED_FAILURE; 824 } 825 826 mdie = (struct rsn_mdie *) parse.mdie; 827 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 828 os_memcmp(mdie->mobility_domain, 829 sm->wpa_auth->conf.mobility_domain, 830 MOBILITY_DOMAIN_ID_LEN) != 0) { 831 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 832 return WLAN_STATUS_INVALID_MDIE; 833 } 834 835 ftie = (struct rsn_ftie *) parse.ftie; 836 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 837 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 838 return WLAN_STATUS_INVALID_FTIE; 839 } 840 841 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 842 843 if (parse.r0kh_id == NULL) { 844 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 845 return WLAN_STATUS_INVALID_FTIE; 846 } 847 848 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 849 parse.r0kh_id, parse.r0kh_id_len); 850 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 851 sm->r0kh_id_len = parse.r0kh_id_len; 852 853 if (parse.rsn_pmkid == NULL) { 854 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 855 return WLAN_STATUS_INVALID_PMKID; 856 } 857 858 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 859 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 860 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 861 sm->wpa_auth->conf.r1_key_holder, sm->addr, 862 pmk_r1_name); 863 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 864 pmk_r1_name, WPA_PMK_NAME_LEN); 865 866 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 867 &pairwise) < 0) { 868 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { 869 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 870 "PMK-R1 and unknown R0KH-ID"); 871 return WLAN_STATUS_INVALID_PMKID; 872 } 873 874 return -1; /* Status pending */ 875 } 876 877 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 878 sm->pmk_r1_name_valid = 1; 879 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 880 881 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 882 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 883 "ANonce"); 884 return WLAN_STATUS_UNSPECIFIED_FAILURE; 885 } 886 887 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 888 sm->SNonce, WPA_NONCE_LEN); 889 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 890 sm->ANonce, WPA_NONCE_LEN); 891 892 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 893 sm->wpa_auth->addr, pmk_r1_name, 894 &sm->PTK, ptk_name, sm->wpa_key_mgmt, 895 pairwise) < 0) 896 return WLAN_STATUS_UNSPECIFIED_FAILURE; 897 898 sm->pairwise = pairwise; 899 sm->PTK_valid = TRUE; 900 wpa_ft_install_ptk(sm); 901 902 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 903 2 + FT_R1KH_ID_LEN + 200; 904 *resp_ies = os_zalloc(buflen); 905 if (*resp_ies == NULL) { 906 return WLAN_STATUS_UNSPECIFIED_FAILURE; 907 } 908 909 pos = *resp_ies; 910 end = *resp_ies + buflen; 911 912 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 913 if (ret < 0) { 914 os_free(*resp_ies); 915 *resp_ies = NULL; 916 return WLAN_STATUS_UNSPECIFIED_FAILURE; 917 } 918 pos += ret; 919 920 ret = wpa_write_mdie(conf, pos, end - pos); 921 if (ret < 0) { 922 os_free(*resp_ies); 923 *resp_ies = NULL; 924 return WLAN_STATUS_UNSPECIFIED_FAILURE; 925 } 926 pos += ret; 927 928 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 929 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 930 if (ret < 0) { 931 os_free(*resp_ies); 932 *resp_ies = NULL; 933 return WLAN_STATUS_UNSPECIFIED_FAILURE; 934 } 935 pos += ret; 936 937 *resp_ies_len = pos - *resp_ies; 938 939 return WLAN_STATUS_SUCCESS; 940 } 941 942 943 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 944 u16 auth_transaction, const u8 *ies, size_t ies_len, 945 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 946 u16 auth_transaction, u16 status, 947 const u8 *ies, size_t ies_len), 948 void *ctx) 949 { 950 u16 status; 951 u8 *resp_ies; 952 size_t resp_ies_len; 953 int res; 954 955 if (sm == NULL) { 956 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 957 "WPA SM not available"); 958 return; 959 } 960 961 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 962 " BSSID=" MACSTR " transaction=%d", 963 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 964 sm->ft_pending_cb = cb; 965 sm->ft_pending_cb_ctx = ctx; 966 sm->ft_pending_auth_transaction = auth_transaction; 967 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 968 &resp_ies_len); 969 if (res < 0) { 970 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); 971 return; 972 } 973 status = res; 974 975 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 976 " auth_transaction=%d status=%d", 977 MAC2STR(sm->addr), auth_transaction + 1, status); 978 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 979 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 980 resp_ies, resp_ies_len); 981 os_free(resp_ies); 982 } 983 984 985 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 986 size_t ies_len) 987 { 988 struct wpa_ft_ies parse; 989 struct rsn_mdie *mdie; 990 struct rsn_ftie *ftie; 991 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 992 size_t mic_len = 16; 993 unsigned int count; 994 995 if (sm == NULL) 996 return WLAN_STATUS_UNSPECIFIED_FAILURE; 997 998 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 999 1000 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1001 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1002 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1003 } 1004 1005 if (parse.rsn == NULL) { 1006 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1007 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1008 } 1009 1010 if (parse.rsn_pmkid == NULL) { 1011 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1012 return WLAN_STATUS_INVALID_PMKID; 1013 } 1014 1015 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) 1016 != 0) { 1017 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1018 "with the PMKR1Name derived from auth request"); 1019 return WLAN_STATUS_INVALID_PMKID; 1020 } 1021 1022 mdie = (struct rsn_mdie *) parse.mdie; 1023 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1024 os_memcmp(mdie->mobility_domain, 1025 sm->wpa_auth->conf.mobility_domain, 1026 MOBILITY_DOMAIN_ID_LEN) != 0) { 1027 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1028 return WLAN_STATUS_INVALID_MDIE; 1029 } 1030 1031 ftie = (struct rsn_ftie *) parse.ftie; 1032 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1033 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1034 return WLAN_STATUS_INVALID_FTIE; 1035 } 1036 1037 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1038 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1039 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1040 ftie->snonce, WPA_NONCE_LEN); 1041 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1042 sm->SNonce, WPA_NONCE_LEN); 1043 return -1; 1044 } 1045 1046 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1047 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1048 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1049 ftie->anonce, WPA_NONCE_LEN); 1050 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1051 sm->ANonce, WPA_NONCE_LEN); 1052 return -1; 1053 } 1054 1055 1056 if (parse.r0kh_id == NULL) { 1057 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1058 return -1; 1059 } 1060 1061 if (parse.r0kh_id_len != sm->r0kh_id_len || 1062 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 1063 { 1064 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1065 "the current R0KH-ID"); 1066 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1067 parse.r0kh_id, parse.r0kh_id_len); 1068 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1069 sm->r0kh_id, sm->r0kh_id_len); 1070 return -1; 1071 } 1072 1073 if (parse.r1kh_id == NULL) { 1074 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1075 return -1; 1076 } 1077 1078 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1079 FT_R1KH_ID_LEN) != 0) { 1080 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1081 "ReassocReq"); 1082 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1083 parse.r1kh_id, FT_R1KH_ID_LEN); 1084 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1085 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1086 return -1; 1087 } 1088 1089 if (parse.rsn_pmkid == NULL || 1090 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 1091 { 1092 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1093 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1094 return -1; 1095 } 1096 1097 count = 3; 1098 if (parse.ric) 1099 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1100 if (ftie->mic_control[1] != count) { 1101 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1102 "Control: received %u expected %u", 1103 ftie->mic_control[1], count); 1104 return -1; 1105 } 1106 1107 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 1108 sm->wpa_auth->addr, 5, 1109 parse.mdie - 2, parse.mdie_len + 2, 1110 parse.ftie - 2, parse.ftie_len + 2, 1111 parse.rsn - 2, parse.rsn_len + 2, 1112 parse.ric, parse.ric_len, 1113 mic) < 0) { 1114 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1115 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1116 } 1117 1118 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) { 1119 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1120 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1121 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1122 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", 1123 ftie->mic, mic_len); 1124 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len); 1125 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", 1126 parse.mdie - 2, parse.mdie_len + 2); 1127 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", 1128 parse.ftie - 2, parse.ftie_len + 2); 1129 wpa_hexdump(MSG_MSGDUMP, "FT: RSN", 1130 parse.rsn - 2, parse.rsn_len + 2); 1131 return WLAN_STATUS_INVALID_FTIE; 1132 } 1133 1134 return WLAN_STATUS_SUCCESS; 1135 } 1136 1137 1138 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1139 { 1140 const u8 *sta_addr, *target_ap; 1141 const u8 *ies; 1142 size_t ies_len; 1143 u8 action; 1144 struct ft_rrb_frame *frame; 1145 1146 if (sm == NULL) 1147 return -1; 1148 1149 /* 1150 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1151 * FT Request action frame body[variable] 1152 */ 1153 1154 if (len < 14) { 1155 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1156 "(len=%lu)", (unsigned long) len); 1157 return -1; 1158 } 1159 1160 action = data[1]; 1161 sta_addr = data + 2; 1162 target_ap = data + 8; 1163 ies = data + 14; 1164 ies_len = len - 14; 1165 1166 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1167 " Target AP=" MACSTR " Action=%d)", 1168 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1169 1170 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1171 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1172 "STA=" MACSTR " STA-Address=" MACSTR, 1173 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1174 return -1; 1175 } 1176 1177 /* 1178 * Do some sanity checking on the target AP address (not own and not 1179 * broadcast. This could be extended to filter based on a list of known 1180 * APs in the MD (if such a list were configured). 1181 */ 1182 if ((target_ap[0] & 0x01) || 1183 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1184 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1185 "frame"); 1186 return -1; 1187 } 1188 1189 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1190 1191 /* RRB - Forward action frame to the target AP */ 1192 frame = os_malloc(sizeof(*frame) + len); 1193 if (frame == NULL) 1194 return -1; 1195 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1196 frame->packet_type = FT_PACKET_REQUEST; 1197 frame->action_length = host_to_le16(len); 1198 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1199 os_memcpy(frame + 1, data, len); 1200 1201 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1202 sizeof(*frame) + len); 1203 os_free(frame); 1204 1205 return 0; 1206 } 1207 1208 1209 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid, 1210 u16 auth_transaction, u16 resp, 1211 const u8 *ies, size_t ies_len) 1212 { 1213 struct wpa_state_machine *sm = ctx; 1214 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR, 1215 MAC2STR(sm->addr)); 1216 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr, 1217 WLAN_STATUS_SUCCESS, ies, ies_len); 1218 } 1219 1220 1221 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1222 const u8 *current_ap, const u8 *sta_addr, 1223 const u8 *body, size_t len) 1224 { 1225 struct wpa_state_machine *sm; 1226 u16 status; 1227 u8 *resp_ies; 1228 size_t resp_ies_len; 1229 int res; 1230 1231 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1232 if (sm == NULL) { 1233 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1234 "RRB Request"); 1235 return -1; 1236 } 1237 1238 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1239 1240 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb; 1241 sm->ft_pending_cb_ctx = sm; 1242 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN); 1243 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1244 &resp_ies_len); 1245 if (res < 0) { 1246 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response"); 1247 return 0; 1248 } 1249 status = res; 1250 1251 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status, 1252 resp_ies, resp_ies_len); 1253 os_free(resp_ies); 1254 return res; 1255 } 1256 1257 1258 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 1259 const u8 *current_ap, const u8 *sta_addr, 1260 u16 status, const u8 *resp_ies, 1261 size_t resp_ies_len) 1262 { 1263 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 1264 size_t rlen; 1265 struct ft_rrb_frame *frame; 1266 u8 *pos; 1267 1268 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1269 " CurrentAP=" MACSTR " status=%d", 1270 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1271 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1272 1273 /* RRB - Forward action frame response to the Current AP */ 1274 1275 /* 1276 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1277 * Status_Code[2] FT Request action frame body[variable] 1278 */ 1279 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1280 1281 frame = os_malloc(sizeof(*frame) + rlen); 1282 if (frame == NULL) 1283 return -1; 1284 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1285 frame->packet_type = FT_PACKET_RESPONSE; 1286 frame->action_length = host_to_le16(rlen); 1287 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1288 pos = (u8 *) (frame + 1); 1289 *pos++ = WLAN_ACTION_FT; 1290 *pos++ = 2; /* Action: Response */ 1291 os_memcpy(pos, sta_addr, ETH_ALEN); 1292 pos += ETH_ALEN; 1293 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1294 pos += ETH_ALEN; 1295 WPA_PUT_LE16(pos, status); 1296 pos += 2; 1297 if (resp_ies) 1298 os_memcpy(pos, resp_ies, resp_ies_len); 1299 1300 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1301 sizeof(*frame) + rlen); 1302 os_free(frame); 1303 1304 return 0; 1305 } 1306 1307 1308 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1309 const u8 *src_addr, 1310 const u8 *data, size_t data_len) 1311 { 1312 struct ft_r0kh_r1kh_pull_frame f; 1313 const u8 *crypt; 1314 u8 *plain; 1315 struct ft_remote_r1kh *r1kh; 1316 struct ft_r0kh_r1kh_resp_frame resp, r; 1317 u8 pmk_r0[PMK_LEN]; 1318 int pairwise; 1319 1320 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1321 1322 if (data_len < sizeof(f)) 1323 return -1; 1324 1325 r1kh = wpa_auth->conf.r1kh_list; 1326 while (r1kh) { 1327 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1328 break; 1329 r1kh = r1kh->next; 1330 } 1331 if (r1kh == NULL) { 1332 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1333 "PMK-R1 pull source address " MACSTR, 1334 MAC2STR(src_addr)); 1335 return -1; 1336 } 1337 1338 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1339 os_memset(&f, 0, sizeof(f)); 1340 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1341 /* aes_unwrap() does not support inplace decryption, so use a temporary 1342 * buffer for the data. */ 1343 if (aes_unwrap(r1kh->key, sizeof(r1kh->key), 1344 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1345 crypt, plain) < 0) { 1346 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1347 "request from " MACSTR, MAC2STR(src_addr)); 1348 return -1; 1349 } 1350 1351 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1352 f.nonce, sizeof(f.nonce)); 1353 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1354 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1355 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1356 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1357 1358 os_memset(&resp, 0, sizeof(resp)); 1359 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1360 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1361 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1362 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1363 1364 /* aes_wrap() does not support inplace encryption, so use a temporary 1365 * buffer for the data. */ 1366 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1367 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1368 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1369 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1370 &pairwise) < 0) { 1371 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1372 "PMK-R1 pull"); 1373 return -1; 1374 } 1375 1376 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1377 r.pmk_r1, r.pmk_r1_name); 1378 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1379 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1380 WPA_PMK_NAME_LEN); 1381 r.pairwise = host_to_le16(pairwise); 1382 os_memset(r.pad, 0, sizeof(r.pad)); 1383 1384 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1385 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1386 r.nonce, resp.nonce) < 0) { 1387 os_memset(pmk_r0, 0, PMK_LEN); 1388 return -1; 1389 } 1390 1391 os_memset(pmk_r0, 0, PMK_LEN); 1392 1393 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1394 1395 return 0; 1396 } 1397 1398 1399 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx) 1400 { 1401 struct wpa_state_machine *sm = eloop_ctx; 1402 int res; 1403 u8 *resp_ies; 1404 size_t resp_ies_len; 1405 u16 status; 1406 1407 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), 1408 wpabuf_len(sm->ft_pending_req_ies), 1409 &resp_ies, &resp_ies_len); 1410 wpabuf_free(sm->ft_pending_req_ies); 1411 sm->ft_pending_req_ies = NULL; 1412 if (res < 0) 1413 res = WLAN_STATUS_UNSPECIFIED_FAILURE; 1414 status = res; 1415 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR 1416 " - status %u", MAC2STR(sm->addr), status); 1417 1418 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, 1419 sm->ft_pending_auth_transaction + 1, status, 1420 resp_ies, resp_ies_len); 1421 os_free(resp_ies); 1422 } 1423 1424 1425 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx) 1426 { 1427 struct ft_r0kh_r1kh_resp_frame *frame = ctx; 1428 1429 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0) 1430 return 0; 1431 if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce, 1432 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0) 1433 return 0; 1434 if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) 1435 return 0; 1436 1437 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " 1438 MACSTR " - process from timeout", MAC2STR(sm->addr)); 1439 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL); 1440 return 1; 1441 } 1442 1443 1444 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1445 const u8 *src_addr, 1446 const u8 *data, size_t data_len) 1447 { 1448 struct ft_r0kh_r1kh_resp_frame f; 1449 const u8 *crypt; 1450 u8 *plain; 1451 struct ft_remote_r0kh *r0kh; 1452 int pairwise, res; 1453 1454 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1455 1456 if (data_len < sizeof(f)) 1457 return -1; 1458 1459 r0kh = wpa_auth->conf.r0kh_list; 1460 while (r0kh) { 1461 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1462 break; 1463 r0kh = r0kh->next; 1464 } 1465 if (r0kh == NULL) { 1466 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1467 "PMK-R0 pull response source address " MACSTR, 1468 MAC2STR(src_addr)); 1469 return -1; 1470 } 1471 1472 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1473 os_memset(&f, 0, sizeof(f)); 1474 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1475 /* aes_unwrap() does not support inplace decryption, so use a temporary 1476 * buffer for the data. */ 1477 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1478 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1479 crypt, plain) < 0) { 1480 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1481 "response from " MACSTR, MAC2STR(src_addr)); 1482 return -1; 1483 } 1484 1485 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1486 FT_R1KH_ID_LEN) != 0) { 1487 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1488 "matching R1KH-ID"); 1489 return -1; 1490 } 1491 1492 pairwise = le_to_host16(f.pairwise); 1493 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1494 f.nonce, sizeof(f.nonce)); 1495 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1496 MACSTR " pairwise=0x%x", 1497 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1498 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1499 f.pmk_r1, PMK_LEN); 1500 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1501 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1502 1503 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1504 pairwise); 1505 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request"); 1506 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f); 1507 os_memset(f.pmk_r1, 0, PMK_LEN); 1508 1509 return res ? 0 : -1; 1510 } 1511 1512 1513 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1514 const u8 *src_addr, 1515 const u8 *data, size_t data_len) 1516 { 1517 struct ft_r0kh_r1kh_push_frame f; 1518 const u8 *crypt; 1519 u8 *plain; 1520 struct ft_remote_r0kh *r0kh; 1521 struct os_time now; 1522 os_time_t tsend; 1523 int pairwise; 1524 1525 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1526 1527 if (data_len < sizeof(f)) 1528 return -1; 1529 1530 r0kh = wpa_auth->conf.r0kh_list; 1531 while (r0kh) { 1532 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1533 break; 1534 r0kh = r0kh->next; 1535 } 1536 if (r0kh == NULL) { 1537 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1538 "PMK-R0 push source address " MACSTR, 1539 MAC2STR(src_addr)); 1540 return -1; 1541 } 1542 1543 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp); 1544 os_memset(&f, 0, sizeof(f)); 1545 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1546 timestamp); 1547 /* aes_unwrap() does not support inplace decryption, so use a temporary 1548 * buffer for the data. */ 1549 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1550 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1551 crypt, plain) < 0) { 1552 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1553 MACSTR, MAC2STR(src_addr)); 1554 return -1; 1555 } 1556 1557 os_get_time(&now); 1558 tsend = WPA_GET_LE32(f.timestamp); 1559 if ((now.sec > tsend && now.sec - tsend > 60) || 1560 (now.sec < tsend && tsend - now.sec > 60)) { 1561 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1562 "timestamp: sender time %d own time %d\n", 1563 (int) tsend, (int) now.sec); 1564 return -1; 1565 } 1566 1567 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1568 FT_R1KH_ID_LEN) != 0) { 1569 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1570 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1571 MAC2STR(f.r1kh_id), 1572 MAC2STR(wpa_auth->conf.r1_key_holder)); 1573 return -1; 1574 } 1575 1576 pairwise = le_to_host16(f.pairwise); 1577 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1578 MACSTR " pairwise=0x%x", 1579 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1580 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1581 f.pmk_r1, PMK_LEN); 1582 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1583 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1584 1585 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1586 pairwise); 1587 os_memset(f.pmk_r1, 0, PMK_LEN); 1588 1589 return 0; 1590 } 1591 1592 1593 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1594 const u8 *data, size_t data_len) 1595 { 1596 struct ft_rrb_frame *frame; 1597 u16 alen; 1598 const u8 *pos, *end, *start; 1599 u8 action; 1600 const u8 *sta_addr, *target_ap_addr; 1601 1602 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1603 MAC2STR(src_addr)); 1604 1605 if (data_len < sizeof(*frame)) { 1606 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1607 (unsigned long) data_len); 1608 return -1; 1609 } 1610 1611 pos = data; 1612 frame = (struct ft_rrb_frame *) pos; 1613 pos += sizeof(*frame); 1614 1615 alen = le_to_host16(frame->action_length); 1616 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1617 "action_length=%d ap_address=" MACSTR, 1618 frame->frame_type, frame->packet_type, alen, 1619 MAC2STR(frame->ap_address)); 1620 1621 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1622 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1623 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1624 "unrecognized type %d", frame->frame_type); 1625 return -1; 1626 } 1627 1628 if (alen > data_len - sizeof(*frame)) { 1629 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1630 "frame"); 1631 return -1; 1632 } 1633 1634 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1635 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1636 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1637 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1638 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1639 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1640 1641 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1642 1643 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1644 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1645 "room for Action Frame body); alen=%lu", 1646 (unsigned long) alen); 1647 return -1; 1648 } 1649 start = pos; 1650 end = pos + alen; 1651 1652 if (*pos != WLAN_ACTION_FT) { 1653 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1654 "%d", *pos); 1655 return -1; 1656 } 1657 1658 pos++; 1659 action = *pos++; 1660 sta_addr = pos; 1661 pos += ETH_ALEN; 1662 target_ap_addr = pos; 1663 pos += ETH_ALEN; 1664 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1665 MACSTR " target_ap_addr=" MACSTR, 1666 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1667 1668 if (frame->packet_type == FT_PACKET_REQUEST) { 1669 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1670 1671 if (action != 1) { 1672 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1673 "RRB Request", action); 1674 return -1; 1675 } 1676 1677 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1678 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1679 "RRB Request does not match with own " 1680 "address"); 1681 return -1; 1682 } 1683 1684 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1685 sta_addr, pos, end - pos) < 0) 1686 return -1; 1687 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1688 u16 status_code; 1689 1690 if (end - pos < 2) { 1691 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1692 "code in RRB Response"); 1693 return -1; 1694 } 1695 status_code = WPA_GET_LE16(pos); 1696 pos += 2; 1697 1698 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1699 "(status_code=%d)", status_code); 1700 1701 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1702 return -1; 1703 } else { 1704 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1705 "packet_type %d", frame->packet_type); 1706 return -1; 1707 } 1708 1709 if (end > pos) { 1710 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end", 1711 pos, end - pos); 1712 } 1713 1714 return 0; 1715 } 1716 1717 1718 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1719 struct wpa_ft_pmk_r0_sa *pmk_r0, 1720 struct ft_remote_r1kh *r1kh, 1721 const u8 *s1kh_id, int pairwise) 1722 { 1723 struct ft_r0kh_r1kh_push_frame frame, f; 1724 struct os_time now; 1725 const u8 *plain; 1726 u8 *crypt; 1727 1728 os_memset(&frame, 0, sizeof(frame)); 1729 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1730 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1731 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1732 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1733 1734 /* aes_wrap() does not support inplace encryption, so use a temporary 1735 * buffer for the data. */ 1736 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1737 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1738 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1739 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1740 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1741 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1742 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1743 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1744 WPA_PMK_NAME_LEN); 1745 os_get_time(&now); 1746 WPA_PUT_LE32(f.timestamp, now.sec); 1747 f.pairwise = host_to_le16(pairwise); 1748 os_memset(f.pad, 0, sizeof(f.pad)); 1749 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1750 timestamp); 1751 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame, 1752 timestamp); 1753 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1754 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1755 plain, crypt) < 0) 1756 return; 1757 1758 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1759 } 1760 1761 1762 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1763 { 1764 struct wpa_ft_pmk_r0_sa *r0; 1765 struct ft_remote_r1kh *r1kh; 1766 1767 if (!wpa_auth->conf.pmk_r1_push) 1768 return; 1769 1770 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1771 while (r0) { 1772 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1773 break; 1774 r0 = r0->next; 1775 } 1776 1777 if (r0 == NULL || r0->pmk_r1_pushed) 1778 return; 1779 r0->pmk_r1_pushed = 1; 1780 1781 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1782 "for STA " MACSTR, MAC2STR(addr)); 1783 1784 r1kh = wpa_auth->conf.r1kh_list; 1785 while (r1kh) { 1786 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1787 r1kh = r1kh->next; 1788 } 1789 } 1790 1791 #endif /* CONFIG_IEEE80211R */ 1792