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 if (parse.wmm_tspec) { 538 struct wmm_tspec_element *tspec; 539 540 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 541 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 542 "(%d)", (int) parse.wmm_tspec_len); 543 rdie->status_code = 544 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 545 return pos; 546 } 547 if (end - pos < (int) sizeof(*tspec)) { 548 wpa_printf(MSG_ERROR, "FT: Not enough room for " 549 "response TSPEC"); 550 rdie->status_code = 551 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 552 return pos; 553 } 554 tspec = (struct wmm_tspec_element *) pos; 555 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 556 } 557 558 #ifdef NEED_AP_MLME 559 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { 560 int res; 561 562 res = wmm_process_tspec((struct wmm_tspec_element *) pos); 563 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 564 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 565 rdie->status_code = 566 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 567 else if (res == WMM_ADDTS_STATUS_REFUSED) 568 rdie->status_code = 569 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 570 else { 571 /* TSPEC accepted; include updated TSPEC in response */ 572 rdie->descr_count = 1; 573 pos += sizeof(struct wmm_tspec_element); 574 } 575 return pos; 576 } 577 #endif /* NEED_AP_MLME */ 578 579 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { 580 int res; 581 582 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, 583 sizeof(struct wmm_tspec_element)); 584 if (res >= 0) { 585 if (res) 586 rdie->status_code = host_to_le16(res); 587 else { 588 /* TSPEC accepted; include updated TSPEC in 589 * response */ 590 rdie->descr_count = 1; 591 pos += sizeof(struct wmm_tspec_element); 592 } 593 return pos; 594 } 595 } 596 597 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 598 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 599 return pos; 600 } 601 602 603 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, 604 const u8 *ric, size_t ric_len) 605 { 606 const u8 *rpos, *start; 607 const struct rsn_rdie *rdie; 608 609 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 610 611 rpos = ric; 612 while (rpos + sizeof(*rdie) < ric + ric_len) { 613 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 614 rpos + 2 + rpos[1] > ric + ric_len) 615 break; 616 rdie = (const struct rsn_rdie *) (rpos + 2); 617 rpos += 2 + rpos[1]; 618 start = rpos; 619 620 while (rpos + 2 <= ric + ric_len && 621 rpos + 2 + rpos[1] <= ric + ric_len) { 622 if (rpos[0] == WLAN_EID_RIC_DATA) 623 break; 624 rpos += 2 + rpos[1]; 625 } 626 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, 627 rdie->descr_count, 628 start, rpos - start); 629 } 630 631 return pos; 632 } 633 634 635 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 636 size_t max_len, int auth_alg, 637 const u8 *req_ies, size_t req_ies_len) 638 { 639 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 640 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 641 int res; 642 struct wpa_auth_config *conf; 643 struct rsn_ftie *_ftie; 644 struct wpa_ft_ies parse; 645 u8 *ric_start; 646 u8 *anonce, *snonce; 647 648 if (sm == NULL) 649 return pos; 650 651 conf = &sm->wpa_auth->conf; 652 653 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 654 return pos; 655 656 end = pos + max_len; 657 658 if (auth_alg == WLAN_AUTH_FT) { 659 /* 660 * RSN (only present if this is a Reassociation Response and 661 * part of a fast BSS transition) 662 */ 663 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 664 if (res < 0) 665 return pos; 666 rsnie = pos; 667 rsnie_len = res; 668 pos += res; 669 } 670 671 /* Mobility Domain Information */ 672 res = wpa_write_mdie(conf, pos, end - pos); 673 if (res < 0) 674 return pos; 675 mdie = pos; 676 mdie_len = res; 677 pos += res; 678 679 /* Fast BSS Transition Information */ 680 if (auth_alg == WLAN_AUTH_FT) { 681 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 682 r0kh_id = sm->r0kh_id; 683 r0kh_id_len = sm->r0kh_id_len; 684 anonce = sm->ANonce; 685 snonce = sm->SNonce; 686 #ifdef CONFIG_IEEE80211W 687 if (sm->mgmt_frame_prot) { 688 u8 *igtk; 689 size_t igtk_len; 690 u8 *nbuf; 691 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 692 if (igtk == NULL) { 693 os_free(subelem); 694 return pos; 695 } 696 nbuf = os_realloc(subelem, subelem_len + igtk_len); 697 if (nbuf == NULL) { 698 os_free(subelem); 699 os_free(igtk); 700 return pos; 701 } 702 subelem = nbuf; 703 os_memcpy(subelem + subelem_len, igtk, igtk_len); 704 subelem_len += igtk_len; 705 os_free(igtk); 706 } 707 #endif /* CONFIG_IEEE80211W */ 708 } else { 709 r0kh_id = conf->r0_key_holder; 710 r0kh_id_len = conf->r0_key_holder_len; 711 anonce = NULL; 712 snonce = NULL; 713 } 714 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 715 end - pos, subelem, subelem_len); 716 os_free(subelem); 717 if (res < 0) 718 return pos; 719 ftie = pos; 720 ftie_len = res; 721 pos += res; 722 723 os_free(sm->assoc_resp_ftie); 724 sm->assoc_resp_ftie = os_malloc(ftie_len); 725 if (sm->assoc_resp_ftie) 726 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 727 728 _ftie = (struct rsn_ftie *) (ftie + 2); 729 if (auth_alg == WLAN_AUTH_FT) 730 _ftie->mic_control[1] = 3; /* Information element count */ 731 732 ric_start = pos; 733 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 734 pos = wpa_ft_process_ric(sm, pos, end, parse.ric, 735 parse.ric_len); 736 if (auth_alg == WLAN_AUTH_FT) 737 _ftie->mic_control[1] += 738 ieee802_11_ie_count(ric_start, 739 pos - ric_start); 740 } 741 if (ric_start == pos) 742 ric_start = NULL; 743 744 if (auth_alg == WLAN_AUTH_FT && 745 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 746 sm->wpa_auth->addr, 6, 747 mdie, mdie_len, ftie, ftie_len, 748 rsnie, rsnie_len, 749 ric_start, ric_start ? pos - ric_start : 0, 750 _ftie->mic) < 0) 751 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 752 753 return pos; 754 } 755 756 757 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 758 int vlan_id, 759 enum wpa_alg alg, const u8 *addr, int idx, 760 u8 *key, size_t key_len) 761 { 762 if (wpa_auth->cb.set_key == NULL) 763 return -1; 764 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 765 key, key_len); 766 } 767 768 769 void wpa_ft_install_ptk(struct wpa_state_machine *sm) 770 { 771 enum wpa_alg alg; 772 int klen; 773 774 /* MLME-SETKEYS.request(PTK) */ 775 alg = wpa_cipher_to_alg(sm->pairwise); 776 klen = wpa_cipher_key_len(sm->pairwise); 777 if (!wpa_cipher_valid_pairwise(sm->pairwise)) { 778 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 779 "PTK configuration", sm->pairwise); 780 return; 781 } 782 783 if (sm->tk_already_set) { 784 /* Must avoid TK reconfiguration to prevent clearing of TX/RX 785 * PN in the driver */ 786 wpa_printf(MSG_DEBUG, 787 "FT: Do not re-install same PTK to the driver"); 788 return; 789 } 790 791 /* FIX: add STA entry to kernel/driver here? The set_key will fail 792 * most likely without this.. At the moment, STA entry is added only 793 * after association has been completed. This function will be called 794 * again after association to get the PTK configured, but that could be 795 * optimized by adding the STA entry earlier. 796 */ 797 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 798 sm->PTK.tk, klen)) 799 return; 800 801 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 802 sm->pairwise_set = TRUE; 803 sm->tk_already_set = TRUE; 804 } 805 806 807 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, 808 const u8 *ies, size_t ies_len, 809 u8 **resp_ies, size_t *resp_ies_len) 810 { 811 struct rsn_mdie *mdie; 812 struct rsn_ftie *ftie; 813 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 814 u8 ptk_name[WPA_PMK_NAME_LEN]; 815 struct wpa_auth_config *conf; 816 struct wpa_ft_ies parse; 817 size_t buflen; 818 int ret; 819 u8 *pos, *end; 820 int pairwise; 821 822 *resp_ies = NULL; 823 *resp_ies_len = 0; 824 825 sm->pmk_r1_name_valid = 0; 826 conf = &sm->wpa_auth->conf; 827 828 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 829 ies, ies_len); 830 831 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 832 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 833 return WLAN_STATUS_UNSPECIFIED_FAILURE; 834 } 835 836 mdie = (struct rsn_mdie *) parse.mdie; 837 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 838 os_memcmp(mdie->mobility_domain, 839 sm->wpa_auth->conf.mobility_domain, 840 MOBILITY_DOMAIN_ID_LEN) != 0) { 841 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 842 return WLAN_STATUS_INVALID_MDIE; 843 } 844 845 ftie = (struct rsn_ftie *) parse.ftie; 846 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 847 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 848 return WLAN_STATUS_INVALID_FTIE; 849 } 850 851 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 852 853 if (parse.r0kh_id == NULL) { 854 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 855 return WLAN_STATUS_INVALID_FTIE; 856 } 857 858 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 859 parse.r0kh_id, parse.r0kh_id_len); 860 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 861 sm->r0kh_id_len = parse.r0kh_id_len; 862 863 if (parse.rsn_pmkid == NULL) { 864 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 865 return WLAN_STATUS_INVALID_PMKID; 866 } 867 868 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 869 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 870 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 871 sm->wpa_auth->conf.r1_key_holder, sm->addr, 872 pmk_r1_name); 873 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 874 pmk_r1_name, WPA_PMK_NAME_LEN); 875 876 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 877 &pairwise) < 0) { 878 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { 879 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 880 "PMK-R1 and unknown R0KH-ID"); 881 return WLAN_STATUS_INVALID_PMKID; 882 } 883 884 return -1; /* Status pending */ 885 } 886 887 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 888 sm->pmk_r1_name_valid = 1; 889 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 890 891 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 892 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 893 "ANonce"); 894 return WLAN_STATUS_UNSPECIFIED_FAILURE; 895 } 896 897 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 898 sm->SNonce, WPA_NONCE_LEN); 899 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 900 sm->ANonce, WPA_NONCE_LEN); 901 902 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 903 sm->wpa_auth->addr, pmk_r1_name, 904 &sm->PTK, ptk_name, sm->wpa_key_mgmt, 905 pairwise) < 0) 906 return WLAN_STATUS_UNSPECIFIED_FAILURE; 907 908 sm->pairwise = pairwise; 909 sm->PTK_valid = TRUE; 910 sm->tk_already_set = FALSE; 911 wpa_ft_install_ptk(sm); 912 913 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 914 2 + FT_R1KH_ID_LEN + 200; 915 *resp_ies = os_zalloc(buflen); 916 if (*resp_ies == NULL) { 917 return WLAN_STATUS_UNSPECIFIED_FAILURE; 918 } 919 920 pos = *resp_ies; 921 end = *resp_ies + buflen; 922 923 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 924 if (ret < 0) { 925 os_free(*resp_ies); 926 *resp_ies = NULL; 927 return WLAN_STATUS_UNSPECIFIED_FAILURE; 928 } 929 pos += ret; 930 931 ret = wpa_write_mdie(conf, pos, end - pos); 932 if (ret < 0) { 933 os_free(*resp_ies); 934 *resp_ies = NULL; 935 return WLAN_STATUS_UNSPECIFIED_FAILURE; 936 } 937 pos += ret; 938 939 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 940 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 941 if (ret < 0) { 942 os_free(*resp_ies); 943 *resp_ies = NULL; 944 return WLAN_STATUS_UNSPECIFIED_FAILURE; 945 } 946 pos += ret; 947 948 *resp_ies_len = pos - *resp_ies; 949 950 return WLAN_STATUS_SUCCESS; 951 } 952 953 954 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 955 u16 auth_transaction, const u8 *ies, size_t ies_len, 956 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 957 u16 auth_transaction, u16 status, 958 const u8 *ies, size_t ies_len), 959 void *ctx) 960 { 961 u16 status; 962 u8 *resp_ies; 963 size_t resp_ies_len; 964 int res; 965 966 if (sm == NULL) { 967 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 968 "WPA SM not available"); 969 return; 970 } 971 972 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 973 " BSSID=" MACSTR " transaction=%d", 974 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 975 sm->ft_pending_cb = cb; 976 sm->ft_pending_cb_ctx = ctx; 977 sm->ft_pending_auth_transaction = auth_transaction; 978 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 979 &resp_ies_len); 980 if (res < 0) { 981 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); 982 return; 983 } 984 status = res; 985 986 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 987 " auth_transaction=%d status=%d", 988 MAC2STR(sm->addr), auth_transaction + 1, status); 989 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 990 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 991 resp_ies, resp_ies_len); 992 os_free(resp_ies); 993 } 994 995 996 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 997 size_t ies_len) 998 { 999 struct wpa_ft_ies parse; 1000 struct rsn_mdie *mdie; 1001 struct rsn_ftie *ftie; 1002 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1003 size_t mic_len = 16; 1004 unsigned int count; 1005 1006 if (sm == NULL) 1007 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1008 1009 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 1010 1011 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1012 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1013 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1014 } 1015 1016 if (parse.rsn == NULL) { 1017 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1018 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1019 } 1020 1021 if (parse.rsn_pmkid == NULL) { 1022 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1023 return WLAN_STATUS_INVALID_PMKID; 1024 } 1025 1026 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) 1027 != 0) { 1028 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1029 "with the PMKR1Name derived from auth request"); 1030 return WLAN_STATUS_INVALID_PMKID; 1031 } 1032 1033 mdie = (struct rsn_mdie *) parse.mdie; 1034 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1035 os_memcmp(mdie->mobility_domain, 1036 sm->wpa_auth->conf.mobility_domain, 1037 MOBILITY_DOMAIN_ID_LEN) != 0) { 1038 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1039 return WLAN_STATUS_INVALID_MDIE; 1040 } 1041 1042 ftie = (struct rsn_ftie *) parse.ftie; 1043 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1044 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1045 return WLAN_STATUS_INVALID_FTIE; 1046 } 1047 1048 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1049 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1050 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1051 ftie->snonce, WPA_NONCE_LEN); 1052 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1053 sm->SNonce, WPA_NONCE_LEN); 1054 return -1; 1055 } 1056 1057 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1058 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1059 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1060 ftie->anonce, WPA_NONCE_LEN); 1061 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1062 sm->ANonce, WPA_NONCE_LEN); 1063 return -1; 1064 } 1065 1066 1067 if (parse.r0kh_id == NULL) { 1068 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1069 return -1; 1070 } 1071 1072 if (parse.r0kh_id_len != sm->r0kh_id_len || 1073 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 1074 { 1075 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1076 "the current R0KH-ID"); 1077 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1078 parse.r0kh_id, parse.r0kh_id_len); 1079 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1080 sm->r0kh_id, sm->r0kh_id_len); 1081 return -1; 1082 } 1083 1084 if (parse.r1kh_id == NULL) { 1085 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1086 return -1; 1087 } 1088 1089 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1090 FT_R1KH_ID_LEN) != 0) { 1091 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1092 "ReassocReq"); 1093 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1094 parse.r1kh_id, FT_R1KH_ID_LEN); 1095 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1096 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1097 return -1; 1098 } 1099 1100 if (parse.rsn_pmkid == NULL || 1101 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 1102 { 1103 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1104 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1105 return -1; 1106 } 1107 1108 count = 3; 1109 if (parse.ric) 1110 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1111 if (ftie->mic_control[1] != count) { 1112 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1113 "Control: received %u expected %u", 1114 ftie->mic_control[1], count); 1115 return -1; 1116 } 1117 1118 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr, 1119 sm->wpa_auth->addr, 5, 1120 parse.mdie - 2, parse.mdie_len + 2, 1121 parse.ftie - 2, parse.ftie_len + 2, 1122 parse.rsn - 2, parse.rsn_len + 2, 1123 parse.ric, parse.ric_len, 1124 mic) < 0) { 1125 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1126 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1127 } 1128 1129 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) { 1130 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1131 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1132 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1133 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", 1134 ftie->mic, mic_len); 1135 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len); 1136 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", 1137 parse.mdie - 2, parse.mdie_len + 2); 1138 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", 1139 parse.ftie - 2, parse.ftie_len + 2); 1140 wpa_hexdump(MSG_MSGDUMP, "FT: RSN", 1141 parse.rsn - 2, parse.rsn_len + 2); 1142 return WLAN_STATUS_INVALID_FTIE; 1143 } 1144 1145 return WLAN_STATUS_SUCCESS; 1146 } 1147 1148 1149 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1150 { 1151 const u8 *sta_addr, *target_ap; 1152 const u8 *ies; 1153 size_t ies_len; 1154 u8 action; 1155 struct ft_rrb_frame *frame; 1156 1157 if (sm == NULL) 1158 return -1; 1159 1160 /* 1161 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1162 * FT Request action frame body[variable] 1163 */ 1164 1165 if (len < 14) { 1166 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1167 "(len=%lu)", (unsigned long) len); 1168 return -1; 1169 } 1170 1171 action = data[1]; 1172 sta_addr = data + 2; 1173 target_ap = data + 8; 1174 ies = data + 14; 1175 ies_len = len - 14; 1176 1177 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1178 " Target AP=" MACSTR " Action=%d)", 1179 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1180 1181 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1182 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1183 "STA=" MACSTR " STA-Address=" MACSTR, 1184 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1185 return -1; 1186 } 1187 1188 /* 1189 * Do some sanity checking on the target AP address (not own and not 1190 * broadcast. This could be extended to filter based on a list of known 1191 * APs in the MD (if such a list were configured). 1192 */ 1193 if ((target_ap[0] & 0x01) || 1194 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1195 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1196 "frame"); 1197 return -1; 1198 } 1199 1200 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1201 1202 /* RRB - Forward action frame to the target AP */ 1203 frame = os_malloc(sizeof(*frame) + len); 1204 if (frame == NULL) 1205 return -1; 1206 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1207 frame->packet_type = FT_PACKET_REQUEST; 1208 frame->action_length = host_to_le16(len); 1209 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1210 os_memcpy(frame + 1, data, len); 1211 1212 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1213 sizeof(*frame) + len); 1214 os_free(frame); 1215 1216 return 0; 1217 } 1218 1219 1220 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid, 1221 u16 auth_transaction, u16 resp, 1222 const u8 *ies, size_t ies_len) 1223 { 1224 struct wpa_state_machine *sm = ctx; 1225 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR, 1226 MAC2STR(sm->addr)); 1227 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr, 1228 WLAN_STATUS_SUCCESS, ies, ies_len); 1229 } 1230 1231 1232 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1233 const u8 *current_ap, const u8 *sta_addr, 1234 const u8 *body, size_t len) 1235 { 1236 struct wpa_state_machine *sm; 1237 u16 status; 1238 u8 *resp_ies; 1239 size_t resp_ies_len; 1240 int res; 1241 1242 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1243 if (sm == NULL) { 1244 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1245 "RRB Request"); 1246 return -1; 1247 } 1248 1249 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1250 1251 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb; 1252 sm->ft_pending_cb_ctx = sm; 1253 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN); 1254 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1255 &resp_ies_len); 1256 if (res < 0) { 1257 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response"); 1258 return 0; 1259 } 1260 status = res; 1261 1262 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status, 1263 resp_ies, resp_ies_len); 1264 os_free(resp_ies); 1265 return res; 1266 } 1267 1268 1269 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 1270 const u8 *current_ap, const u8 *sta_addr, 1271 u16 status, const u8 *resp_ies, 1272 size_t resp_ies_len) 1273 { 1274 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 1275 size_t rlen; 1276 struct ft_rrb_frame *frame; 1277 u8 *pos; 1278 1279 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1280 " CurrentAP=" MACSTR " status=%d", 1281 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1282 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1283 1284 /* RRB - Forward action frame response to the Current AP */ 1285 1286 /* 1287 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1288 * Status_Code[2] FT Request action frame body[variable] 1289 */ 1290 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1291 1292 frame = os_malloc(sizeof(*frame) + rlen); 1293 if (frame == NULL) 1294 return -1; 1295 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1296 frame->packet_type = FT_PACKET_RESPONSE; 1297 frame->action_length = host_to_le16(rlen); 1298 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1299 pos = (u8 *) (frame + 1); 1300 *pos++ = WLAN_ACTION_FT; 1301 *pos++ = 2; /* Action: Response */ 1302 os_memcpy(pos, sta_addr, ETH_ALEN); 1303 pos += ETH_ALEN; 1304 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1305 pos += ETH_ALEN; 1306 WPA_PUT_LE16(pos, status); 1307 pos += 2; 1308 if (resp_ies) 1309 os_memcpy(pos, resp_ies, resp_ies_len); 1310 1311 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1312 sizeof(*frame) + rlen); 1313 os_free(frame); 1314 1315 return 0; 1316 } 1317 1318 1319 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1320 const u8 *src_addr, 1321 const u8 *data, size_t data_len) 1322 { 1323 struct ft_r0kh_r1kh_pull_frame f; 1324 const u8 *crypt; 1325 u8 *plain; 1326 struct ft_remote_r1kh *r1kh; 1327 struct ft_r0kh_r1kh_resp_frame resp, r; 1328 u8 pmk_r0[PMK_LEN]; 1329 int pairwise; 1330 1331 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1332 1333 if (data_len < sizeof(f)) 1334 return -1; 1335 1336 r1kh = wpa_auth->conf.r1kh_list; 1337 while (r1kh) { 1338 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1339 break; 1340 r1kh = r1kh->next; 1341 } 1342 if (r1kh == NULL) { 1343 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1344 "PMK-R1 pull source address " MACSTR, 1345 MAC2STR(src_addr)); 1346 return -1; 1347 } 1348 1349 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1350 os_memset(&f, 0, sizeof(f)); 1351 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce); 1352 /* aes_unwrap() does not support inplace decryption, so use a temporary 1353 * buffer for the data. */ 1354 if (aes_unwrap(r1kh->key, sizeof(r1kh->key), 1355 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1356 crypt, plain) < 0) { 1357 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1358 "request from " MACSTR, MAC2STR(src_addr)); 1359 return -1; 1360 } 1361 1362 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1363 f.nonce, sizeof(f.nonce)); 1364 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1365 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1366 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1367 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1368 1369 os_memset(&resp, 0, sizeof(resp)); 1370 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1371 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1372 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1373 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1374 1375 /* aes_wrap() does not support inplace encryption, so use a temporary 1376 * buffer for the data. */ 1377 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1378 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1379 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1380 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1381 &pairwise) < 0) { 1382 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1383 "PMK-R1 pull"); 1384 return -1; 1385 } 1386 1387 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1388 r.pmk_r1, r.pmk_r1_name); 1389 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1390 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1391 WPA_PMK_NAME_LEN); 1392 r.pairwise = host_to_le16(pairwise); 1393 os_memset(r.pad, 0, sizeof(r.pad)); 1394 1395 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1396 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1397 r.nonce, resp.nonce) < 0) { 1398 os_memset(pmk_r0, 0, PMK_LEN); 1399 return -1; 1400 } 1401 1402 os_memset(pmk_r0, 0, PMK_LEN); 1403 1404 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1405 1406 return 0; 1407 } 1408 1409 1410 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx) 1411 { 1412 struct wpa_state_machine *sm = eloop_ctx; 1413 int res; 1414 u8 *resp_ies; 1415 size_t resp_ies_len; 1416 u16 status; 1417 1418 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), 1419 wpabuf_len(sm->ft_pending_req_ies), 1420 &resp_ies, &resp_ies_len); 1421 wpabuf_free(sm->ft_pending_req_ies); 1422 sm->ft_pending_req_ies = NULL; 1423 if (res < 0) 1424 res = WLAN_STATUS_UNSPECIFIED_FAILURE; 1425 status = res; 1426 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR 1427 " - status %u", MAC2STR(sm->addr), status); 1428 1429 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, 1430 sm->ft_pending_auth_transaction + 1, status, 1431 resp_ies, resp_ies_len); 1432 os_free(resp_ies); 1433 } 1434 1435 1436 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx) 1437 { 1438 struct ft_r0kh_r1kh_resp_frame *frame = ctx; 1439 1440 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0) 1441 return 0; 1442 if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce, 1443 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0) 1444 return 0; 1445 if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) 1446 return 0; 1447 1448 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " 1449 MACSTR " - process from timeout", MAC2STR(sm->addr)); 1450 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL); 1451 return 1; 1452 } 1453 1454 1455 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1456 const u8 *src_addr, 1457 const u8 *data, size_t data_len) 1458 { 1459 struct ft_r0kh_r1kh_resp_frame f; 1460 const u8 *crypt; 1461 u8 *plain; 1462 struct ft_remote_r0kh *r0kh; 1463 int pairwise, res; 1464 1465 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1466 1467 if (data_len < sizeof(f)) 1468 return -1; 1469 1470 r0kh = wpa_auth->conf.r0kh_list; 1471 while (r0kh) { 1472 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1473 break; 1474 r0kh = r0kh->next; 1475 } 1476 if (r0kh == NULL) { 1477 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1478 "PMK-R0 pull response source address " MACSTR, 1479 MAC2STR(src_addr)); 1480 return -1; 1481 } 1482 1483 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1484 os_memset(&f, 0, sizeof(f)); 1485 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce); 1486 /* aes_unwrap() does not support inplace decryption, so use a temporary 1487 * buffer for the data. */ 1488 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1489 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1490 crypt, plain) < 0) { 1491 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1492 "response from " MACSTR, MAC2STR(src_addr)); 1493 return -1; 1494 } 1495 1496 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1497 FT_R1KH_ID_LEN) != 0) { 1498 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1499 "matching R1KH-ID"); 1500 return -1; 1501 } 1502 1503 pairwise = le_to_host16(f.pairwise); 1504 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1505 f.nonce, sizeof(f.nonce)); 1506 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1507 MACSTR " pairwise=0x%x", 1508 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1509 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1510 f.pmk_r1, PMK_LEN); 1511 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1512 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1513 1514 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1515 pairwise); 1516 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request"); 1517 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f); 1518 os_memset(f.pmk_r1, 0, PMK_LEN); 1519 1520 return res ? 0 : -1; 1521 } 1522 1523 1524 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1525 const u8 *src_addr, 1526 const u8 *data, size_t data_len) 1527 { 1528 struct ft_r0kh_r1kh_push_frame f; 1529 const u8 *crypt; 1530 u8 *plain; 1531 struct ft_remote_r0kh *r0kh; 1532 struct os_time now; 1533 os_time_t tsend; 1534 int pairwise; 1535 1536 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1537 1538 if (data_len < sizeof(f)) 1539 return -1; 1540 1541 r0kh = wpa_auth->conf.r0kh_list; 1542 while (r0kh) { 1543 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1544 break; 1545 r0kh = r0kh->next; 1546 } 1547 if (r0kh == NULL) { 1548 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1549 "PMK-R0 push source address " MACSTR, 1550 MAC2STR(src_addr)); 1551 return -1; 1552 } 1553 1554 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp); 1555 os_memset(&f, 0, sizeof(f)); 1556 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1557 timestamp); 1558 /* aes_unwrap() does not support inplace decryption, so use a temporary 1559 * buffer for the data. */ 1560 if (aes_unwrap(r0kh->key, sizeof(r0kh->key), 1561 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1562 crypt, plain) < 0) { 1563 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1564 MACSTR, MAC2STR(src_addr)); 1565 return -1; 1566 } 1567 1568 os_get_time(&now); 1569 tsend = WPA_GET_LE32(f.timestamp); 1570 if ((now.sec > tsend && now.sec - tsend > 60) || 1571 (now.sec < tsend && tsend - now.sec > 60)) { 1572 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1573 "timestamp: sender time %d own time %d\n", 1574 (int) tsend, (int) now.sec); 1575 return -1; 1576 } 1577 1578 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1579 FT_R1KH_ID_LEN) != 0) { 1580 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1581 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1582 MAC2STR(f.r1kh_id), 1583 MAC2STR(wpa_auth->conf.r1_key_holder)); 1584 return -1; 1585 } 1586 1587 pairwise = le_to_host16(f.pairwise); 1588 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1589 MACSTR " pairwise=0x%x", 1590 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1591 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1592 f.pmk_r1, PMK_LEN); 1593 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1594 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1595 1596 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1597 pairwise); 1598 os_memset(f.pmk_r1, 0, PMK_LEN); 1599 1600 return 0; 1601 } 1602 1603 1604 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1605 const u8 *data, size_t data_len) 1606 { 1607 struct ft_rrb_frame *frame; 1608 u16 alen; 1609 const u8 *pos, *end, *start; 1610 u8 action; 1611 const u8 *sta_addr, *target_ap_addr; 1612 1613 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1614 MAC2STR(src_addr)); 1615 1616 if (data_len < sizeof(*frame)) { 1617 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1618 (unsigned long) data_len); 1619 return -1; 1620 } 1621 1622 pos = data; 1623 frame = (struct ft_rrb_frame *) pos; 1624 pos += sizeof(*frame); 1625 1626 alen = le_to_host16(frame->action_length); 1627 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1628 "action_length=%d ap_address=" MACSTR, 1629 frame->frame_type, frame->packet_type, alen, 1630 MAC2STR(frame->ap_address)); 1631 1632 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1633 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1634 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1635 "unrecognized type %d", frame->frame_type); 1636 return -1; 1637 } 1638 1639 if (alen > data_len - sizeof(*frame)) { 1640 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1641 "frame"); 1642 return -1; 1643 } 1644 1645 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1646 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1647 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1648 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1649 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1650 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1651 1652 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1653 1654 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1655 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1656 "room for Action Frame body); alen=%lu", 1657 (unsigned long) alen); 1658 return -1; 1659 } 1660 start = pos; 1661 end = pos + alen; 1662 1663 if (*pos != WLAN_ACTION_FT) { 1664 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1665 "%d", *pos); 1666 return -1; 1667 } 1668 1669 pos++; 1670 action = *pos++; 1671 sta_addr = pos; 1672 pos += ETH_ALEN; 1673 target_ap_addr = pos; 1674 pos += ETH_ALEN; 1675 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1676 MACSTR " target_ap_addr=" MACSTR, 1677 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1678 1679 if (frame->packet_type == FT_PACKET_REQUEST) { 1680 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1681 1682 if (action != 1) { 1683 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1684 "RRB Request", action); 1685 return -1; 1686 } 1687 1688 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1689 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1690 "RRB Request does not match with own " 1691 "address"); 1692 return -1; 1693 } 1694 1695 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1696 sta_addr, pos, end - pos) < 0) 1697 return -1; 1698 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1699 u16 status_code; 1700 1701 if (end - pos < 2) { 1702 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1703 "code in RRB Response"); 1704 return -1; 1705 } 1706 status_code = WPA_GET_LE16(pos); 1707 pos += 2; 1708 1709 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1710 "(status_code=%d)", status_code); 1711 1712 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1713 return -1; 1714 } else { 1715 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1716 "packet_type %d", frame->packet_type); 1717 return -1; 1718 } 1719 1720 if (end > pos) { 1721 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end", 1722 pos, end - pos); 1723 } 1724 1725 return 0; 1726 } 1727 1728 1729 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1730 struct wpa_ft_pmk_r0_sa *pmk_r0, 1731 struct ft_remote_r1kh *r1kh, 1732 const u8 *s1kh_id, int pairwise) 1733 { 1734 struct ft_r0kh_r1kh_push_frame frame, f; 1735 struct os_time now; 1736 const u8 *plain; 1737 u8 *crypt; 1738 1739 os_memset(&frame, 0, sizeof(frame)); 1740 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1741 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1742 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1743 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1744 1745 /* aes_wrap() does not support inplace encryption, so use a temporary 1746 * buffer for the data. */ 1747 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1748 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1749 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1750 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1751 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1752 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1753 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1754 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1755 WPA_PMK_NAME_LEN); 1756 os_get_time(&now); 1757 WPA_PUT_LE32(f.timestamp, now.sec); 1758 f.pairwise = host_to_le16(pairwise); 1759 os_memset(f.pad, 0, sizeof(f.pad)); 1760 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame, 1761 timestamp); 1762 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame, 1763 timestamp); 1764 if (aes_wrap(r1kh->key, sizeof(r1kh->key), 1765 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1766 plain, crypt) < 0) 1767 return; 1768 1769 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1770 } 1771 1772 1773 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1774 { 1775 struct wpa_ft_pmk_r0_sa *r0; 1776 struct ft_remote_r1kh *r1kh; 1777 1778 if (!wpa_auth->conf.pmk_r1_push) 1779 return; 1780 1781 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1782 while (r0) { 1783 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1784 break; 1785 r0 = r0->next; 1786 } 1787 1788 if (r0 == NULL || r0->pmk_r1_pushed) 1789 return; 1790 r0->pmk_r1_pushed = 1; 1791 1792 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1793 "for STA " MACSTR, MAC2STR(addr)); 1794 1795 r1kh = wpa_auth->conf.r1kh_list; 1796 while (r1kh) { 1797 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1798 r1kh = r1kh->next; 1799 } 1800 } 1801 1802 #endif /* CONFIG_IEEE80211R */ 1803