1 /* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2014, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "utils/eloop.h" 13 #include "common/ieee802_11_defs.h" 14 #include "common/ieee802_11_common.h" 15 #include "crypto/aes_wrap.h" 16 #include "crypto/random.h" 17 #include "ap_config.h" 18 #include "ieee802_11.h" 19 #include "wmm.h" 20 #include "wpa_auth.h" 21 #include "wpa_auth_i.h" 22 23 24 #ifdef CONFIG_IEEE80211R 25 26 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 27 const u8 *current_ap, const u8 *sta_addr, 28 u16 status, const u8 *resp_ies, 29 size_t resp_ies_len); 30 31 32 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, 33 const u8 *data, size_t data_len) 34 { 35 if (wpa_auth->cb.send_ether == NULL) 36 return -1; 37 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst)); 38 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB, 39 data, data_len); 40 } 41 42 43 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, 44 const u8 *dst, const u8 *data, size_t data_len) 45 { 46 if (wpa_auth->cb.send_ft_action == NULL) 47 return -1; 48 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst, 49 data, data_len); 50 } 51 52 53 static struct wpa_state_machine * 54 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) 55 { 56 if (wpa_auth->cb.add_sta == NULL) 57 return NULL; 58 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr); 59 } 60 61 62 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth, 63 const u8 *sta_addr, 64 u8 *tspec_ie, size_t tspec_ielen) 65 { 66 if (wpa_auth->cb.add_tspec == NULL) { 67 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized"); 68 return -1; 69 } 70 return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie, 71 tspec_ielen); 72 } 73 74 75 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) 76 { 77 u8 *pos = buf; 78 u8 capab; 79 if (len < 2 + sizeof(struct rsn_mdie)) 80 return -1; 81 82 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 83 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; 84 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 85 pos += MOBILITY_DOMAIN_ID_LEN; 86 capab = 0; 87 if (conf->ft_over_ds) 88 capab |= RSN_FT_CAPAB_FT_OVER_DS; 89 *pos++ = capab; 90 91 return pos - buf; 92 } 93 94 95 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, 96 size_t r0kh_id_len, 97 const u8 *anonce, const u8 *snonce, 98 u8 *buf, size_t len, const u8 *subelem, 99 size_t subelem_len) 100 { 101 u8 *pos = buf, *ielen; 102 struct rsn_ftie *hdr; 103 104 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + 105 subelem_len) 106 return -1; 107 108 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 109 ielen = pos++; 110 111 hdr = (struct rsn_ftie *) pos; 112 os_memset(hdr, 0, sizeof(*hdr)); 113 pos += sizeof(*hdr); 114 WPA_PUT_LE16(hdr->mic_control, 0); 115 if (anonce) 116 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); 117 if (snonce) 118 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); 119 120 /* Optional Parameters */ 121 *pos++ = FTIE_SUBELEM_R1KH_ID; 122 *pos++ = FT_R1KH_ID_LEN; 123 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); 124 pos += FT_R1KH_ID_LEN; 125 126 if (r0kh_id) { 127 *pos++ = FTIE_SUBELEM_R0KH_ID; 128 *pos++ = r0kh_id_len; 129 os_memcpy(pos, r0kh_id, r0kh_id_len); 130 pos += r0kh_id_len; 131 } 132 133 if (subelem) { 134 os_memcpy(pos, subelem, subelem_len); 135 pos += subelem_len; 136 } 137 138 *ielen = pos - buf - 2; 139 140 return pos - buf; 141 } 142 143 144 struct wpa_ft_pmk_r0_sa { 145 struct wpa_ft_pmk_r0_sa *next; 146 u8 pmk_r0[PMK_LEN]; 147 u8 pmk_r0_name[WPA_PMK_NAME_LEN]; 148 u8 spa[ETH_ALEN]; 149 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 150 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 151 int pmk_r1_pushed; 152 }; 153 154 struct wpa_ft_pmk_r1_sa { 155 struct wpa_ft_pmk_r1_sa *next; 156 u8 pmk_r1[PMK_LEN]; 157 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 158 u8 spa[ETH_ALEN]; 159 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 160 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 161 }; 162 163 struct wpa_ft_pmk_cache { 164 struct wpa_ft_pmk_r0_sa *pmk_r0; 165 struct wpa_ft_pmk_r1_sa *pmk_r1; 166 }; 167 168 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) 169 { 170 struct wpa_ft_pmk_cache *cache; 171 172 cache = os_zalloc(sizeof(*cache)); 173 174 return cache; 175 } 176 177 178 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) 179 { 180 struct wpa_ft_pmk_r0_sa *r0, *r0prev; 181 struct wpa_ft_pmk_r1_sa *r1, *r1prev; 182 183 r0 = cache->pmk_r0; 184 while (r0) { 185 r0prev = r0; 186 r0 = r0->next; 187 os_memset(r0prev->pmk_r0, 0, PMK_LEN); 188 os_free(r0prev); 189 } 190 191 r1 = cache->pmk_r1; 192 while (r1) { 193 r1prev = r1; 194 r1 = r1->next; 195 os_memset(r1prev->pmk_r1, 0, PMK_LEN); 196 os_free(r1prev); 197 } 198 199 os_free(cache); 200 } 201 202 203 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, 204 const u8 *spa, const u8 *pmk_r0, 205 const u8 *pmk_r0_name, int pairwise) 206 { 207 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 208 struct wpa_ft_pmk_r0_sa *r0; 209 210 /* TODO: add expiration and limit on number of entries in cache */ 211 212 r0 = os_zalloc(sizeof(*r0)); 213 if (r0 == NULL) 214 return -1; 215 216 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); 217 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 218 os_memcpy(r0->spa, spa, ETH_ALEN); 219 r0->pairwise = pairwise; 220 221 r0->next = cache->pmk_r0; 222 cache->pmk_r0 = r0; 223 224 return 0; 225 } 226 227 228 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, 229 const u8 *spa, const u8 *pmk_r0_name, 230 u8 *pmk_r0, int *pairwise) 231 { 232 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 233 struct wpa_ft_pmk_r0_sa *r0; 234 235 r0 = cache->pmk_r0; 236 while (r0) { 237 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && 238 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name, 239 WPA_PMK_NAME_LEN) == 0) { 240 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); 241 if (pairwise) 242 *pairwise = r0->pairwise; 243 return 0; 244 } 245 246 r0 = r0->next; 247 } 248 249 return -1; 250 } 251 252 253 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, 254 const u8 *spa, const u8 *pmk_r1, 255 const u8 *pmk_r1_name, int pairwise) 256 { 257 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 258 struct wpa_ft_pmk_r1_sa *r1; 259 260 /* TODO: add expiration and limit on number of entries in cache */ 261 262 r1 = os_zalloc(sizeof(*r1)); 263 if (r1 == NULL) 264 return -1; 265 266 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); 267 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 268 os_memcpy(r1->spa, spa, ETH_ALEN); 269 r1->pairwise = pairwise; 270 271 r1->next = cache->pmk_r1; 272 cache->pmk_r1 = r1; 273 274 return 0; 275 } 276 277 278 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, 279 const u8 *spa, const u8 *pmk_r1_name, 280 u8 *pmk_r1, int *pairwise) 281 { 282 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 283 struct wpa_ft_pmk_r1_sa *r1; 284 285 r1 = cache->pmk_r1; 286 while (r1) { 287 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && 288 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name, 289 WPA_PMK_NAME_LEN) == 0) { 290 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); 291 if (pairwise) 292 *pairwise = r1->pairwise; 293 return 0; 294 } 295 296 r1 = r1->next; 297 } 298 299 return -1; 300 } 301 302 303 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm, 304 const u8 *ies, size_t ies_len, 305 const u8 *pmk_r0_name) 306 { 307 struct ft_remote_r0kh *r0kh; 308 struct ft_r0kh_r1kh_pull_frame frame, f; 309 310 r0kh = sm->wpa_auth->conf.r0kh_list; 311 while (r0kh) { 312 if (r0kh->id_len == sm->r0kh_id_len && 313 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) == 314 0) 315 break; 316 r0kh = r0kh->next; 317 } 318 if (r0kh == NULL) { 319 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID", 320 sm->r0kh_id, sm->r0kh_id_len); 321 return -1; 322 } 323 324 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 325 "address " MACSTR, MAC2STR(r0kh->addr)); 326 327 os_memset(&frame, 0, sizeof(frame)); 328 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 329 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 330 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 331 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN); 332 333 /* aes_wrap() does not support inplace encryption, so use a temporary 334 * buffer for the data. */ 335 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) { 336 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 337 "nonce"); 338 return -1; 339 } 340 os_memcpy(sm->ft_pending_pull_nonce, f.nonce, 341 FT_R0KH_R1KH_PULL_NONCE_LEN); 342 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 343 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 344 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN); 345 os_memset(f.pad, 0, sizeof(f.pad)); 346 347 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 348 f.nonce, frame.nonce) < 0) 349 return -1; 350 351 wpabuf_free(sm->ft_pending_req_ies); 352 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len); 353 if (sm->ft_pending_req_ies == NULL) 354 return -1; 355 356 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 357 358 return 0; 359 } 360 361 362 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 363 struct wpa_ptk *ptk, size_t ptk_len) 364 { 365 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 366 u8 pmk_r1[PMK_LEN]; 367 u8 ptk_name[WPA_PMK_NAME_LEN]; 368 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 369 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 370 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 371 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 372 const u8 *ssid = sm->wpa_auth->conf.ssid; 373 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 374 375 376 if (sm->xxkey_len == 0) { 377 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 378 "derivation"); 379 return -1; 380 } 381 382 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 383 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); 384 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 385 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 386 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 387 sm->pairwise); 388 389 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 390 pmk_r1, sm->pmk_r1_name); 391 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 392 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 393 WPA_PMK_NAME_LEN); 394 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name, 395 sm->pairwise); 396 397 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 398 sm->wpa_auth->addr, sm->pmk_r1_name, 399 (u8 *) ptk, ptk_len, ptk_name); 400 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); 401 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 402 403 return 0; 404 } 405 406 407 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 408 const u8 *addr, int idx, u8 *seq) 409 { 410 if (wpa_auth->cb.get_seqnum == NULL) 411 return -1; 412 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 413 } 414 415 416 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 417 { 418 u8 *subelem; 419 struct wpa_group *gsm = sm->group; 420 size_t subelem_len, pad_len; 421 const u8 *key; 422 size_t key_len; 423 u8 keybuf[32]; 424 425 key_len = gsm->GTK_len; 426 if (key_len > sizeof(keybuf)) 427 return NULL; 428 429 /* 430 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 431 * than 16 bytes. 432 */ 433 pad_len = key_len % 8; 434 if (pad_len) 435 pad_len = 8 - pad_len; 436 if (key_len + pad_len < 16) 437 pad_len += 8; 438 if (pad_len && key_len < sizeof(keybuf)) { 439 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 440 os_memset(keybuf + key_len, 0, pad_len); 441 keybuf[key_len] = 0xdd; 442 key_len += pad_len; 443 key = keybuf; 444 } else 445 key = gsm->GTK[gsm->GN - 1]; 446 447 /* 448 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 449 * Key[5..32]. 450 */ 451 subelem_len = 13 + key_len + 8; 452 subelem = os_zalloc(subelem_len); 453 if (subelem == NULL) 454 return NULL; 455 456 subelem[0] = FTIE_SUBELEM_GTK; 457 subelem[1] = 11 + key_len + 8; 458 /* Key ID in B0-B1 of Key Info */ 459 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 460 subelem[4] = gsm->GTK_len; 461 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 462 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) { 463 os_free(subelem); 464 return NULL; 465 } 466 467 *len = subelem_len; 468 return subelem; 469 } 470 471 472 #ifdef CONFIG_IEEE80211W 473 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 474 { 475 u8 *subelem, *pos; 476 struct wpa_group *gsm = sm->group; 477 size_t subelem_len; 478 479 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 480 * Key[16+8] */ 481 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 482 subelem = os_zalloc(subelem_len); 483 if (subelem == NULL) 484 return NULL; 485 486 pos = subelem; 487 *pos++ = FTIE_SUBELEM_IGTK; 488 *pos++ = subelem_len - 2; 489 WPA_PUT_LE16(pos, gsm->GN_igtk); 490 pos += 2; 491 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 492 pos += 6; 493 *pos++ = WPA_IGTK_LEN; 494 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, 495 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 496 os_free(subelem); 497 return NULL; 498 } 499 500 *len = subelem_len; 501 return subelem; 502 } 503 #endif /* CONFIG_IEEE80211W */ 504 505 506 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm, 507 u8 *pos, u8 *end, u8 id, u8 descr_count, 508 const u8 *ies, size_t ies_len) 509 { 510 struct ieee802_11_elems parse; 511 struct rsn_rdie *rdie; 512 513 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 514 id, descr_count); 515 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 516 ies, ies_len); 517 518 if (end - pos < (int) sizeof(*rdie)) { 519 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 520 return pos; 521 } 522 523 *pos++ = WLAN_EID_RIC_DATA; 524 *pos++ = sizeof(*rdie); 525 rdie = (struct rsn_rdie *) pos; 526 rdie->id = id; 527 rdie->descr_count = 0; 528 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 529 pos += sizeof(*rdie); 530 531 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 532 ParseFailed) { 533 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 534 rdie->status_code = 535 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 536 return pos; 537 } 538 539 #ifdef NEED_AP_MLME 540 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { 541 struct wmm_tspec_element *tspec; 542 int res; 543 544 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 545 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 546 "(%d)", (int) parse.wmm_tspec_len); 547 rdie->status_code = 548 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 549 return pos; 550 } 551 if (end - pos < (int) sizeof(*tspec)) { 552 wpa_printf(MSG_ERROR, "FT: Not enough room for " 553 "response TSPEC"); 554 rdie->status_code = 555 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 556 return pos; 557 } 558 tspec = (struct wmm_tspec_element *) pos; 559 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 560 res = wmm_process_tspec(tspec); 561 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 562 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 563 rdie->status_code = 564 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 565 else if (res == WMM_ADDTS_STATUS_REFUSED) 566 rdie->status_code = 567 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 568 else { 569 /* TSPEC accepted; include updated TSPEC in response */ 570 rdie->descr_count = 1; 571 pos += sizeof(*tspec); 572 } 573 return pos; 574 } 575 #endif /* NEED_AP_MLME */ 576 577 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { 578 struct wmm_tspec_element *tspec; 579 int res; 580 581 tspec = (struct wmm_tspec_element *) pos; 582 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 583 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, 584 sizeof(*tspec)); 585 if (res >= 0) { 586 if (res) 587 rdie->status_code = host_to_le16(res); 588 else { 589 /* TSPEC accepted; include updated TSPEC in 590 * response */ 591 rdie->descr_count = 1; 592 pos += sizeof(*tspec); 593 } 594 return pos; 595 } 596 } 597 598 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 599 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 600 return pos; 601 } 602 603 604 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, 605 const u8 *ric, size_t ric_len) 606 { 607 const u8 *rpos, *start; 608 const struct rsn_rdie *rdie; 609 610 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 611 612 rpos = ric; 613 while (rpos + sizeof(*rdie) < ric + ric_len) { 614 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 615 rpos + 2 + rpos[1] > ric + ric_len) 616 break; 617 rdie = (const struct rsn_rdie *) (rpos + 2); 618 rpos += 2 + rpos[1]; 619 start = rpos; 620 621 while (rpos + 2 <= ric + ric_len && 622 rpos + 2 + rpos[1] <= ric + ric_len) { 623 if (rpos[0] == WLAN_EID_RIC_DATA) 624 break; 625 rpos += 2 + rpos[1]; 626 } 627 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, 628 rdie->descr_count, 629 start, rpos - start); 630 } 631 632 return pos; 633 } 634 635 636 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 637 size_t max_len, int auth_alg, 638 const u8 *req_ies, size_t req_ies_len) 639 { 640 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 641 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 642 int res; 643 struct wpa_auth_config *conf; 644 struct rsn_ftie *_ftie; 645 struct wpa_ft_ies parse; 646 u8 *ric_start; 647 u8 *anonce, *snonce; 648 649 if (sm == NULL) 650 return pos; 651 652 conf = &sm->wpa_auth->conf; 653 654 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 655 return pos; 656 657 end = pos + max_len; 658 659 if (auth_alg == WLAN_AUTH_FT) { 660 /* 661 * RSN (only present if this is a Reassociation Response and 662 * part of a fast BSS transition) 663 */ 664 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 665 if (res < 0) 666 return pos; 667 rsnie = pos; 668 rsnie_len = res; 669 pos += res; 670 } 671 672 /* Mobility Domain Information */ 673 res = wpa_write_mdie(conf, pos, end - pos); 674 if (res < 0) 675 return pos; 676 mdie = pos; 677 mdie_len = res; 678 pos += res; 679 680 /* Fast BSS Transition Information */ 681 if (auth_alg == WLAN_AUTH_FT) { 682 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 683 r0kh_id = sm->r0kh_id; 684 r0kh_id_len = sm->r0kh_id_len; 685 anonce = sm->ANonce; 686 snonce = sm->SNonce; 687 #ifdef CONFIG_IEEE80211W 688 if (sm->mgmt_frame_prot) { 689 u8 *igtk; 690 size_t igtk_len; 691 u8 *nbuf; 692 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 693 if (igtk == NULL) { 694 os_free(subelem); 695 return pos; 696 } 697 nbuf = os_realloc(subelem, subelem_len + igtk_len); 698 if (nbuf == NULL) { 699 os_free(subelem); 700 os_free(igtk); 701 return pos; 702 } 703 subelem = nbuf; 704 os_memcpy(subelem + subelem_len, igtk, igtk_len); 705 subelem_len += igtk_len; 706 os_free(igtk); 707 } 708 #endif /* CONFIG_IEEE80211W */ 709 } else { 710 r0kh_id = conf->r0_key_holder; 711 r0kh_id_len = conf->r0_key_holder_len; 712 anonce = NULL; 713 snonce = NULL; 714 } 715 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 716 end - pos, subelem, subelem_len); 717 os_free(subelem); 718 if (res < 0) 719 return pos; 720 ftie = pos; 721 ftie_len = res; 722 pos += res; 723 724 os_free(sm->assoc_resp_ftie); 725 sm->assoc_resp_ftie = os_malloc(ftie_len); 726 if (sm->assoc_resp_ftie) 727 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 728 729 _ftie = (struct rsn_ftie *) (ftie + 2); 730 if (auth_alg == WLAN_AUTH_FT) 731 _ftie->mic_control[1] = 3; /* Information element count */ 732 733 ric_start = pos; 734 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 735 pos = wpa_ft_process_ric(sm, pos, end, parse.ric, 736 parse.ric_len); 737 if (auth_alg == WLAN_AUTH_FT) 738 _ftie->mic_control[1] += 739 ieee802_11_ie_count(ric_start, 740 pos - ric_start); 741 } 742 if (ric_start == pos) 743 ric_start = NULL; 744 745 if (auth_alg == WLAN_AUTH_FT && 746 wpa_ft_mic(sm->PTK.kck, sm->addr, 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 /* FIX: add STA entry to kernel/driver here? The set_key will fail 784 * most likely without this.. At the moment, STA entry is added only 785 * after association has been completed. This function will be called 786 * again after association to get the PTK configured, but that could be 787 * optimized by adding the STA entry earlier. 788 */ 789 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 790 sm->PTK.tk1, klen)) 791 return; 792 793 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 794 sm->pairwise_set = TRUE; 795 } 796 797 798 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, 799 const u8 *ies, size_t ies_len, 800 u8 **resp_ies, size_t *resp_ies_len) 801 { 802 struct rsn_mdie *mdie; 803 struct rsn_ftie *ftie; 804 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 805 u8 ptk_name[WPA_PMK_NAME_LEN]; 806 struct wpa_auth_config *conf; 807 struct wpa_ft_ies parse; 808 size_t buflen, ptk_len; 809 int ret; 810 u8 *pos, *end; 811 int pairwise; 812 813 *resp_ies = NULL; 814 *resp_ies_len = 0; 815 816 sm->pmk_r1_name_valid = 0; 817 conf = &sm->wpa_auth->conf; 818 819 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 820 ies, ies_len); 821 822 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 823 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 824 return WLAN_STATUS_UNSPECIFIED_FAILURE; 825 } 826 827 mdie = (struct rsn_mdie *) parse.mdie; 828 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 829 os_memcmp(mdie->mobility_domain, 830 sm->wpa_auth->conf.mobility_domain, 831 MOBILITY_DOMAIN_ID_LEN) != 0) { 832 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 833 return WLAN_STATUS_INVALID_MDIE; 834 } 835 836 ftie = (struct rsn_ftie *) parse.ftie; 837 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 838 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 839 return WLAN_STATUS_INVALID_FTIE; 840 } 841 842 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 843 844 if (parse.r0kh_id == NULL) { 845 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 846 return WLAN_STATUS_INVALID_FTIE; 847 } 848 849 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 850 parse.r0kh_id, parse.r0kh_id_len); 851 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 852 sm->r0kh_id_len = parse.r0kh_id_len; 853 854 if (parse.rsn_pmkid == NULL) { 855 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 856 return WLAN_STATUS_INVALID_PMKID; 857 } 858 859 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 860 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 861 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 862 sm->wpa_auth->conf.r1_key_holder, sm->addr, 863 pmk_r1_name); 864 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 865 pmk_r1_name, WPA_PMK_NAME_LEN); 866 867 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 868 &pairwise) < 0) { 869 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { 870 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 871 "PMK-R1 and unknown R0KH-ID"); 872 return WLAN_STATUS_INVALID_PMKID; 873 } 874 875 return -1; /* Status pending */ 876 } 877 878 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 879 sm->pmk_r1_name_valid = 1; 880 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 881 882 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 883 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 884 "ANonce"); 885 return WLAN_STATUS_UNSPECIFIED_FAILURE; 886 } 887 888 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 889 sm->SNonce, WPA_NONCE_LEN); 890 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 891 sm->ANonce, WPA_NONCE_LEN); 892 893 ptk_len = pairwise == WPA_CIPHER_TKIP ? 64 : 48; 894 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 895 sm->wpa_auth->addr, pmk_r1_name, 896 (u8 *) &sm->PTK, ptk_len, ptk_name); 897 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 898 (u8 *) &sm->PTK, ptk_len); 899 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 900 901 sm->pairwise = pairwise; 902 sm->PTK_valid = TRUE; 903 wpa_ft_install_ptk(sm); 904 905 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 906 2 + FT_R1KH_ID_LEN + 200; 907 *resp_ies = os_zalloc(buflen); 908 if (*resp_ies == NULL) { 909 return WLAN_STATUS_UNSPECIFIED_FAILURE; 910 } 911 912 pos = *resp_ies; 913 end = *resp_ies + buflen; 914 915 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 916 if (ret < 0) { 917 os_free(*resp_ies); 918 *resp_ies = NULL; 919 return WLAN_STATUS_UNSPECIFIED_FAILURE; 920 } 921 pos += ret; 922 923 ret = wpa_write_mdie(conf, pos, end - pos); 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_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 932 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 933 if (ret < 0) { 934 os_free(*resp_ies); 935 *resp_ies = NULL; 936 return WLAN_STATUS_UNSPECIFIED_FAILURE; 937 } 938 pos += ret; 939 940 *resp_ies_len = pos - *resp_ies; 941 942 return WLAN_STATUS_SUCCESS; 943 } 944 945 946 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 947 u16 auth_transaction, const u8 *ies, size_t ies_len, 948 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 949 u16 auth_transaction, u16 status, 950 const u8 *ies, size_t ies_len), 951 void *ctx) 952 { 953 u16 status; 954 u8 *resp_ies; 955 size_t resp_ies_len; 956 int res; 957 958 if (sm == NULL) { 959 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 960 "WPA SM not available"); 961 return; 962 } 963 964 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 965 " BSSID=" MACSTR " transaction=%d", 966 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 967 sm->ft_pending_cb = cb; 968 sm->ft_pending_cb_ctx = ctx; 969 sm->ft_pending_auth_transaction = auth_transaction; 970 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 971 &resp_ies_len); 972 if (res < 0) { 973 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); 974 return; 975 } 976 status = res; 977 978 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 979 " auth_transaction=%d status=%d", 980 MAC2STR(sm->addr), auth_transaction + 1, status); 981 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 982 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 983 resp_ies, resp_ies_len); 984 os_free(resp_ies); 985 } 986 987 988 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 989 size_t ies_len) 990 { 991 struct wpa_ft_ies parse; 992 struct rsn_mdie *mdie; 993 struct rsn_ftie *ftie; 994 u8 mic[16]; 995 unsigned int count; 996 997 if (sm == NULL) 998 return WLAN_STATUS_UNSPECIFIED_FAILURE; 999 1000 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 1001 1002 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1003 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1004 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1005 } 1006 1007 if (parse.rsn == NULL) { 1008 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1009 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1010 } 1011 1012 if (parse.rsn_pmkid == NULL) { 1013 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1014 return WLAN_STATUS_INVALID_PMKID; 1015 } 1016 1017 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) 1018 != 0) { 1019 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1020 "with the PMKR1Name derived from auth request"); 1021 return WLAN_STATUS_INVALID_PMKID; 1022 } 1023 1024 mdie = (struct rsn_mdie *) parse.mdie; 1025 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1026 os_memcmp(mdie->mobility_domain, 1027 sm->wpa_auth->conf.mobility_domain, 1028 MOBILITY_DOMAIN_ID_LEN) != 0) { 1029 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1030 return WLAN_STATUS_INVALID_MDIE; 1031 } 1032 1033 ftie = (struct rsn_ftie *) parse.ftie; 1034 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1035 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1036 return WLAN_STATUS_INVALID_FTIE; 1037 } 1038 1039 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1040 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1041 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1042 ftie->snonce, WPA_NONCE_LEN); 1043 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1044 sm->SNonce, WPA_NONCE_LEN); 1045 return -1; 1046 } 1047 1048 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1049 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1050 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1051 ftie->anonce, WPA_NONCE_LEN); 1052 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1053 sm->ANonce, WPA_NONCE_LEN); 1054 return -1; 1055 } 1056 1057 1058 if (parse.r0kh_id == NULL) { 1059 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1060 return -1; 1061 } 1062 1063 if (parse.r0kh_id_len != sm->r0kh_id_len || 1064 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) 1065 { 1066 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1067 "the current R0KH-ID"); 1068 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1069 parse.r0kh_id, parse.r0kh_id_len); 1070 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1071 sm->r0kh_id, sm->r0kh_id_len); 1072 return -1; 1073 } 1074 1075 if (parse.r1kh_id == NULL) { 1076 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1077 return -1; 1078 } 1079 1080 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1081 FT_R1KH_ID_LEN) != 0) { 1082 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1083 "ReassocReq"); 1084 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1085 parse.r1kh_id, FT_R1KH_ID_LEN); 1086 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1087 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1088 return -1; 1089 } 1090 1091 if (parse.rsn_pmkid == NULL || 1092 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) 1093 { 1094 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1095 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1096 return -1; 1097 } 1098 1099 count = 3; 1100 if (parse.ric) 1101 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1102 if (ftie->mic_control[1] != count) { 1103 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1104 "Control: received %u expected %u", 1105 ftie->mic_control[1], count); 1106 return -1; 1107 } 1108 1109 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5, 1110 parse.mdie - 2, parse.mdie_len + 2, 1111 parse.ftie - 2, parse.ftie_len + 2, 1112 parse.rsn - 2, parse.rsn_len + 2, 1113 parse.ric, parse.ric_len, 1114 mic) < 0) { 1115 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1116 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1117 } 1118 1119 if (os_memcmp_const(mic, ftie->mic, 16) != 0) { 1120 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1121 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1122 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1123 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 1124 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 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 *frame, f; 1313 struct ft_remote_r1kh *r1kh; 1314 struct ft_r0kh_r1kh_resp_frame resp, r; 1315 u8 pmk_r0[PMK_LEN]; 1316 int pairwise; 1317 1318 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1319 1320 if (data_len < sizeof(*frame)) 1321 return -1; 1322 1323 r1kh = wpa_auth->conf.r1kh_list; 1324 while (r1kh) { 1325 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1326 break; 1327 r1kh = r1kh->next; 1328 } 1329 if (r1kh == NULL) { 1330 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1331 "PMK-R1 pull source address " MACSTR, 1332 MAC2STR(src_addr)); 1333 return -1; 1334 } 1335 1336 frame = (struct ft_r0kh_r1kh_pull_frame *) data; 1337 /* aes_unwrap() does not support inplace decryption, so use a temporary 1338 * buffer for the data. */ 1339 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1340 frame->nonce, f.nonce) < 0) { 1341 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1342 "request from " MACSTR, MAC2STR(src_addr)); 1343 return -1; 1344 } 1345 1346 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1347 f.nonce, sizeof(f.nonce)); 1348 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1349 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1350 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1351 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1352 1353 os_memset(&resp, 0, sizeof(resp)); 1354 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1355 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1356 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1357 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1358 1359 /* aes_wrap() does not support inplace encryption, so use a temporary 1360 * buffer for the data. */ 1361 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1362 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1363 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1364 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1365 &pairwise) < 0) { 1366 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1367 "PMK-R1 pull"); 1368 return -1; 1369 } 1370 1371 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1372 r.pmk_r1, r.pmk_r1_name); 1373 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1374 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1375 WPA_PMK_NAME_LEN); 1376 r.pairwise = host_to_le16(pairwise); 1377 os_memset(r.pad, 0, sizeof(r.pad)); 1378 1379 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1380 r.nonce, resp.nonce) < 0) { 1381 os_memset(pmk_r0, 0, PMK_LEN); 1382 return -1; 1383 } 1384 1385 os_memset(pmk_r0, 0, PMK_LEN); 1386 1387 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1388 1389 return 0; 1390 } 1391 1392 1393 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx) 1394 { 1395 struct wpa_state_machine *sm = eloop_ctx; 1396 int res; 1397 u8 *resp_ies; 1398 size_t resp_ies_len; 1399 u16 status; 1400 1401 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), 1402 wpabuf_len(sm->ft_pending_req_ies), 1403 &resp_ies, &resp_ies_len); 1404 wpabuf_free(sm->ft_pending_req_ies); 1405 sm->ft_pending_req_ies = NULL; 1406 if (res < 0) 1407 res = WLAN_STATUS_UNSPECIFIED_FAILURE; 1408 status = res; 1409 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR 1410 " - status %u", MAC2STR(sm->addr), status); 1411 1412 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, 1413 sm->ft_pending_auth_transaction + 1, status, 1414 resp_ies, resp_ies_len); 1415 os_free(resp_ies); 1416 } 1417 1418 1419 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx) 1420 { 1421 struct ft_r0kh_r1kh_resp_frame *frame = ctx; 1422 1423 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0) 1424 return 0; 1425 if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce, 1426 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0) 1427 return 0; 1428 if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) 1429 return 0; 1430 1431 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " 1432 MACSTR " - process from timeout", MAC2STR(sm->addr)); 1433 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL); 1434 return 1; 1435 } 1436 1437 1438 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1439 const u8 *src_addr, 1440 const u8 *data, size_t data_len) 1441 { 1442 struct ft_r0kh_r1kh_resp_frame *frame, f; 1443 struct ft_remote_r0kh *r0kh; 1444 int pairwise, res; 1445 1446 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1447 1448 if (data_len < sizeof(*frame)) 1449 return -1; 1450 1451 r0kh = wpa_auth->conf.r0kh_list; 1452 while (r0kh) { 1453 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1454 break; 1455 r0kh = r0kh->next; 1456 } 1457 if (r0kh == NULL) { 1458 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1459 "PMK-R0 pull response source address " MACSTR, 1460 MAC2STR(src_addr)); 1461 return -1; 1462 } 1463 1464 frame = (struct ft_r0kh_r1kh_resp_frame *) data; 1465 /* aes_unwrap() does not support inplace decryption, so use a temporary 1466 * buffer for the data. */ 1467 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1468 frame->nonce, f.nonce) < 0) { 1469 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1470 "response from " MACSTR, MAC2STR(src_addr)); 1471 return -1; 1472 } 1473 1474 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1475 FT_R1KH_ID_LEN) != 0) { 1476 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1477 "matching R1KH-ID"); 1478 return -1; 1479 } 1480 1481 pairwise = le_to_host16(f.pairwise); 1482 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1483 f.nonce, sizeof(f.nonce)); 1484 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1485 MACSTR " pairwise=0x%x", 1486 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1487 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1488 f.pmk_r1, PMK_LEN); 1489 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1490 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1491 1492 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1493 pairwise); 1494 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request"); 1495 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f); 1496 os_memset(f.pmk_r1, 0, PMK_LEN); 1497 1498 return res ? 0 : -1; 1499 } 1500 1501 1502 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1503 const u8 *src_addr, 1504 const u8 *data, size_t data_len) 1505 { 1506 struct ft_r0kh_r1kh_push_frame *frame, f; 1507 struct ft_remote_r0kh *r0kh; 1508 struct os_time now; 1509 os_time_t tsend; 1510 int pairwise; 1511 1512 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1513 1514 if (data_len < sizeof(*frame)) 1515 return -1; 1516 1517 r0kh = wpa_auth->conf.r0kh_list; 1518 while (r0kh) { 1519 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1520 break; 1521 r0kh = r0kh->next; 1522 } 1523 if (r0kh == NULL) { 1524 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1525 "PMK-R0 push source address " MACSTR, 1526 MAC2STR(src_addr)); 1527 return -1; 1528 } 1529 1530 frame = (struct ft_r0kh_r1kh_push_frame *) data; 1531 /* aes_unwrap() does not support inplace decryption, so use a temporary 1532 * buffer for the data. */ 1533 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1534 frame->timestamp, f.timestamp) < 0) { 1535 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1536 MACSTR, MAC2STR(src_addr)); 1537 return -1; 1538 } 1539 1540 os_get_time(&now); 1541 tsend = WPA_GET_LE32(f.timestamp); 1542 if ((now.sec > tsend && now.sec - tsend > 60) || 1543 (now.sec < tsend && tsend - now.sec > 60)) { 1544 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1545 "timestamp: sender time %d own time %d\n", 1546 (int) tsend, (int) now.sec); 1547 return -1; 1548 } 1549 1550 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder, 1551 FT_R1KH_ID_LEN) != 0) { 1552 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1553 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1554 MAC2STR(f.r1kh_id), 1555 MAC2STR(wpa_auth->conf.r1_key_holder)); 1556 return -1; 1557 } 1558 1559 pairwise = le_to_host16(f.pairwise); 1560 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1561 MACSTR " pairwise=0x%x", 1562 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1563 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1564 f.pmk_r1, PMK_LEN); 1565 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1566 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1567 1568 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1569 pairwise); 1570 os_memset(f.pmk_r1, 0, PMK_LEN); 1571 1572 return 0; 1573 } 1574 1575 1576 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1577 const u8 *data, size_t data_len) 1578 { 1579 struct ft_rrb_frame *frame; 1580 u16 alen; 1581 const u8 *pos, *end, *start; 1582 u8 action; 1583 const u8 *sta_addr, *target_ap_addr; 1584 1585 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1586 MAC2STR(src_addr)); 1587 1588 if (data_len < sizeof(*frame)) { 1589 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1590 (unsigned long) data_len); 1591 return -1; 1592 } 1593 1594 pos = data; 1595 frame = (struct ft_rrb_frame *) pos; 1596 pos += sizeof(*frame); 1597 1598 alen = le_to_host16(frame->action_length); 1599 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1600 "action_length=%d ap_address=" MACSTR, 1601 frame->frame_type, frame->packet_type, alen, 1602 MAC2STR(frame->ap_address)); 1603 1604 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1605 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1606 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1607 "unrecognized type %d", frame->frame_type); 1608 return -1; 1609 } 1610 1611 if (alen > data_len - sizeof(*frame)) { 1612 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1613 "frame"); 1614 return -1; 1615 } 1616 1617 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1618 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1619 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1620 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1621 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1622 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1623 1624 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1625 1626 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1627 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1628 "room for Action Frame body); alen=%lu", 1629 (unsigned long) alen); 1630 return -1; 1631 } 1632 start = pos; 1633 end = pos + alen; 1634 1635 if (*pos != WLAN_ACTION_FT) { 1636 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1637 "%d", *pos); 1638 return -1; 1639 } 1640 1641 pos++; 1642 action = *pos++; 1643 sta_addr = pos; 1644 pos += ETH_ALEN; 1645 target_ap_addr = pos; 1646 pos += ETH_ALEN; 1647 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1648 MACSTR " target_ap_addr=" MACSTR, 1649 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1650 1651 if (frame->packet_type == FT_PACKET_REQUEST) { 1652 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1653 1654 if (action != 1) { 1655 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1656 "RRB Request", action); 1657 return -1; 1658 } 1659 1660 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1661 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1662 "RRB Request does not match with own " 1663 "address"); 1664 return -1; 1665 } 1666 1667 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1668 sta_addr, pos, end - pos) < 0) 1669 return -1; 1670 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1671 u16 status_code; 1672 1673 if (end - pos < 2) { 1674 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1675 "code in RRB Response"); 1676 return -1; 1677 } 1678 status_code = WPA_GET_LE16(pos); 1679 pos += 2; 1680 1681 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1682 "(status_code=%d)", status_code); 1683 1684 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1685 return -1; 1686 } else { 1687 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1688 "packet_type %d", frame->packet_type); 1689 return -1; 1690 } 1691 1692 if (end > pos) { 1693 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end", 1694 pos, end - pos); 1695 } 1696 1697 return 0; 1698 } 1699 1700 1701 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1702 struct wpa_ft_pmk_r0_sa *pmk_r0, 1703 struct ft_remote_r1kh *r1kh, 1704 const u8 *s1kh_id, int pairwise) 1705 { 1706 struct ft_r0kh_r1kh_push_frame frame, f; 1707 struct os_time now; 1708 1709 os_memset(&frame, 0, sizeof(frame)); 1710 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1711 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1712 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1713 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1714 1715 /* aes_wrap() does not support inplace encryption, so use a temporary 1716 * buffer for the data. */ 1717 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1718 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1719 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1720 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1721 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1722 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1723 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1724 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1725 WPA_PMK_NAME_LEN); 1726 os_get_time(&now); 1727 WPA_PUT_LE32(f.timestamp, now.sec); 1728 f.pairwise = host_to_le16(pairwise); 1729 os_memset(f.pad, 0, sizeof(f.pad)); 1730 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1731 f.timestamp, frame.timestamp) < 0) 1732 return; 1733 1734 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1735 } 1736 1737 1738 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1739 { 1740 struct wpa_ft_pmk_r0_sa *r0; 1741 struct ft_remote_r1kh *r1kh; 1742 1743 if (!wpa_auth->conf.pmk_r1_push) 1744 return; 1745 1746 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1747 while (r0) { 1748 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1749 break; 1750 r0 = r0->next; 1751 } 1752 1753 if (r0 == NULL || r0->pmk_r1_pushed) 1754 return; 1755 r0->pmk_r1_pushed = 1; 1756 1757 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1758 "for STA " MACSTR, MAC2STR(addr)); 1759 1760 r1kh = wpa_auth->conf.r1kh_list; 1761 while (r1kh) { 1762 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1763 r1kh = r1kh->next; 1764 } 1765 } 1766 1767 #endif /* CONFIG_IEEE80211R */ 1768
