1 /* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2009, 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 "common/ieee802_11_defs.h" 13 #include "common/ieee802_11_common.h" 14 #include "crypto/aes_wrap.h" 15 #include "crypto/random.h" 16 #include "ap_config.h" 17 #include "ieee802_11.h" 18 #include "wmm.h" 19 #include "wpa_auth.h" 20 #include "wpa_auth_i.h" 21 22 23 #ifdef CONFIG_IEEE80211R 24 25 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, 26 const u8 *data, size_t data_len) 27 { 28 if (wpa_auth->cb.send_ether == NULL) 29 return -1; 30 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst)); 31 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB, 32 data, data_len); 33 } 34 35 36 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, 37 const u8 *dst, const u8 *data, size_t data_len) 38 { 39 if (wpa_auth->cb.send_ft_action == NULL) 40 return -1; 41 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst, 42 data, data_len); 43 } 44 45 46 static struct wpa_state_machine * 47 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) 48 { 49 if (wpa_auth->cb.add_sta == NULL) 50 return NULL; 51 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr); 52 } 53 54 55 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) 56 { 57 u8 *pos = buf; 58 u8 capab; 59 if (len < 2 + sizeof(struct rsn_mdie)) 60 return -1; 61 62 *pos++ = WLAN_EID_MOBILITY_DOMAIN; 63 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; 64 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 65 pos += MOBILITY_DOMAIN_ID_LEN; 66 capab = 0; 67 if (conf->ft_over_ds) 68 capab |= RSN_FT_CAPAB_FT_OVER_DS; 69 *pos++ = capab; 70 71 return pos - buf; 72 } 73 74 75 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, 76 size_t r0kh_id_len, 77 const u8 *anonce, const u8 *snonce, 78 u8 *buf, size_t len, const u8 *subelem, 79 size_t subelem_len) 80 { 81 u8 *pos = buf, *ielen; 82 struct rsn_ftie *hdr; 83 84 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + 85 subelem_len) 86 return -1; 87 88 *pos++ = WLAN_EID_FAST_BSS_TRANSITION; 89 ielen = pos++; 90 91 hdr = (struct rsn_ftie *) pos; 92 os_memset(hdr, 0, sizeof(*hdr)); 93 pos += sizeof(*hdr); 94 WPA_PUT_LE16(hdr->mic_control, 0); 95 if (anonce) 96 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); 97 if (snonce) 98 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); 99 100 /* Optional Parameters */ 101 *pos++ = FTIE_SUBELEM_R1KH_ID; 102 *pos++ = FT_R1KH_ID_LEN; 103 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); 104 pos += FT_R1KH_ID_LEN; 105 106 if (r0kh_id) { 107 *pos++ = FTIE_SUBELEM_R0KH_ID; 108 *pos++ = r0kh_id_len; 109 os_memcpy(pos, r0kh_id, r0kh_id_len); 110 pos += r0kh_id_len; 111 } 112 113 if (subelem) { 114 os_memcpy(pos, subelem, subelem_len); 115 pos += subelem_len; 116 } 117 118 *ielen = pos - buf - 2; 119 120 return pos - buf; 121 } 122 123 124 struct wpa_ft_pmk_r0_sa { 125 struct wpa_ft_pmk_r0_sa *next; 126 u8 pmk_r0[PMK_LEN]; 127 u8 pmk_r0_name[WPA_PMK_NAME_LEN]; 128 u8 spa[ETH_ALEN]; 129 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 130 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 131 int pmk_r1_pushed; 132 }; 133 134 struct wpa_ft_pmk_r1_sa { 135 struct wpa_ft_pmk_r1_sa *next; 136 u8 pmk_r1[PMK_LEN]; 137 u8 pmk_r1_name[WPA_PMK_NAME_LEN]; 138 u8 spa[ETH_ALEN]; 139 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ 140 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ 141 }; 142 143 struct wpa_ft_pmk_cache { 144 struct wpa_ft_pmk_r0_sa *pmk_r0; 145 struct wpa_ft_pmk_r1_sa *pmk_r1; 146 }; 147 148 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) 149 { 150 struct wpa_ft_pmk_cache *cache; 151 152 cache = os_zalloc(sizeof(*cache)); 153 154 return cache; 155 } 156 157 158 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) 159 { 160 struct wpa_ft_pmk_r0_sa *r0, *r0prev; 161 struct wpa_ft_pmk_r1_sa *r1, *r1prev; 162 163 r0 = cache->pmk_r0; 164 while (r0) { 165 r0prev = r0; 166 r0 = r0->next; 167 os_memset(r0prev->pmk_r0, 0, PMK_LEN); 168 os_free(r0prev); 169 } 170 171 r1 = cache->pmk_r1; 172 while (r1) { 173 r1prev = r1; 174 r1 = r1->next; 175 os_memset(r1prev->pmk_r1, 0, PMK_LEN); 176 os_free(r1prev); 177 } 178 179 os_free(cache); 180 } 181 182 183 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, 184 const u8 *spa, const u8 *pmk_r0, 185 const u8 *pmk_r0_name, int pairwise) 186 { 187 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 188 struct wpa_ft_pmk_r0_sa *r0; 189 190 /* TODO: add expiration and limit on number of entries in cache */ 191 192 r0 = os_zalloc(sizeof(*r0)); 193 if (r0 == NULL) 194 return -1; 195 196 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); 197 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 198 os_memcpy(r0->spa, spa, ETH_ALEN); 199 r0->pairwise = pairwise; 200 201 r0->next = cache->pmk_r0; 202 cache->pmk_r0 = r0; 203 204 return 0; 205 } 206 207 208 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, 209 const u8 *spa, const u8 *pmk_r0_name, 210 u8 *pmk_r0, int *pairwise) 211 { 212 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 213 struct wpa_ft_pmk_r0_sa *r0; 214 215 r0 = cache->pmk_r0; 216 while (r0) { 217 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && 218 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN) 219 == 0) { 220 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); 221 if (pairwise) 222 *pairwise = r0->pairwise; 223 return 0; 224 } 225 226 r0 = r0->next; 227 } 228 229 return -1; 230 } 231 232 233 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, 234 const u8 *spa, const u8 *pmk_r1, 235 const u8 *pmk_r1_name, int pairwise) 236 { 237 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 238 struct wpa_ft_pmk_r1_sa *r1; 239 240 /* TODO: add expiration and limit on number of entries in cache */ 241 242 r1 = os_zalloc(sizeof(*r1)); 243 if (r1 == NULL) 244 return -1; 245 246 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); 247 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 248 os_memcpy(r1->spa, spa, ETH_ALEN); 249 r1->pairwise = pairwise; 250 251 r1->next = cache->pmk_r1; 252 cache->pmk_r1 = r1; 253 254 return 0; 255 } 256 257 258 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, 259 const u8 *spa, const u8 *pmk_r1_name, 260 u8 *pmk_r1, int *pairwise) 261 { 262 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; 263 struct wpa_ft_pmk_r1_sa *r1; 264 265 r1 = cache->pmk_r1; 266 while (r1) { 267 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && 268 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN) 269 == 0) { 270 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); 271 if (pairwise) 272 *pairwise = r1->pairwise; 273 return 0; 274 } 275 276 r1 = r1->next; 277 } 278 279 return -1; 280 } 281 282 283 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth, 284 const u8 *s1kh_id, const u8 *r0kh_id, 285 size_t r0kh_id_len, const u8 *pmk_r0_name) 286 { 287 struct ft_remote_r0kh *r0kh; 288 struct ft_r0kh_r1kh_pull_frame frame, f; 289 290 r0kh = wpa_auth->conf.r0kh_list; 291 while (r0kh) { 292 if (r0kh->id_len == r0kh_id_len && 293 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0) 294 break; 295 r0kh = r0kh->next; 296 } 297 if (r0kh == NULL) 298 return -1; 299 300 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 301 "address " MACSTR, MAC2STR(r0kh->addr)); 302 303 os_memset(&frame, 0, sizeof(frame)); 304 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 305 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 306 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 307 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 308 309 /* aes_wrap() does not support inplace encryption, so use a temporary 310 * buffer for the data. */ 311 if (random_get_bytes(f.nonce, sizeof(f.nonce))) { 312 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 313 "nonce"); 314 return -1; 315 } 316 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 317 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 318 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 319 320 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 321 f.nonce, frame.nonce) < 0) 322 return -1; 323 324 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 325 326 return 0; 327 } 328 329 330 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 331 struct wpa_ptk *ptk, size_t ptk_len) 332 { 333 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 334 u8 pmk_r1[PMK_LEN]; 335 u8 ptk_name[WPA_PMK_NAME_LEN]; 336 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 337 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 338 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 339 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 340 const u8 *ssid = sm->wpa_auth->conf.ssid; 341 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 342 343 344 if (sm->xxkey_len == 0) { 345 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 346 "derivation"); 347 return -1; 348 } 349 350 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 351 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); 352 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 353 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 354 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 355 sm->pairwise); 356 357 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 358 pmk_r1, sm->pmk_r1_name); 359 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 360 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 361 WPA_PMK_NAME_LEN); 362 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name, 363 sm->pairwise); 364 365 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 366 sm->wpa_auth->addr, sm->pmk_r1_name, 367 (u8 *) ptk, ptk_len, ptk_name); 368 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); 369 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 370 371 return 0; 372 } 373 374 375 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 376 const u8 *addr, int idx, u8 *seq) 377 { 378 if (wpa_auth->cb.get_seqnum == NULL) 379 return -1; 380 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 381 } 382 383 384 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 385 { 386 u8 *subelem; 387 struct wpa_group *gsm = sm->group; 388 size_t subelem_len, pad_len; 389 const u8 *key; 390 size_t key_len; 391 u8 keybuf[32]; 392 393 key_len = gsm->GTK_len; 394 if (key_len > sizeof(keybuf)) 395 return NULL; 396 397 /* 398 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 399 * than 16 bytes. 400 */ 401 pad_len = key_len % 8; 402 if (pad_len) 403 pad_len = 8 - pad_len; 404 if (key_len + pad_len < 16) 405 pad_len += 8; 406 if (pad_len) { 407 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 408 os_memset(keybuf + key_len, 0, pad_len); 409 keybuf[key_len] = 0xdd; 410 key_len += pad_len; 411 key = keybuf; 412 } else 413 key = gsm->GTK[gsm->GN - 1]; 414 415 /* 416 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 417 * Key[5..32]. 418 */ 419 subelem_len = 13 + key_len + 8; 420 subelem = os_zalloc(subelem_len); 421 if (subelem == NULL) 422 return NULL; 423 424 subelem[0] = FTIE_SUBELEM_GTK; 425 subelem[1] = 11 + key_len + 8; 426 /* Key ID in B0-B1 of Key Info */ 427 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 428 subelem[4] = gsm->GTK_len; 429 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 430 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) { 431 os_free(subelem); 432 return NULL; 433 } 434 435 *len = subelem_len; 436 return subelem; 437 } 438 439 440 #ifdef CONFIG_IEEE80211W 441 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 442 { 443 u8 *subelem, *pos; 444 struct wpa_group *gsm = sm->group; 445 size_t subelem_len; 446 447 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 448 * Key[16+8] */ 449 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 450 subelem = os_zalloc(subelem_len); 451 if (subelem == NULL) 452 return NULL; 453 454 pos = subelem; 455 *pos++ = FTIE_SUBELEM_IGTK; 456 *pos++ = subelem_len - 2; 457 WPA_PUT_LE16(pos, gsm->GN_igtk); 458 pos += 2; 459 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 460 pos += 6; 461 *pos++ = WPA_IGTK_LEN; 462 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, 463 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 464 os_free(subelem); 465 return NULL; 466 } 467 468 *len = subelem_len; 469 return subelem; 470 } 471 #endif /* CONFIG_IEEE80211W */ 472 473 474 static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count, 475 const u8 *ies, size_t ies_len) 476 { 477 struct ieee802_11_elems parse; 478 struct rsn_rdie *rdie; 479 480 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 481 id, descr_count); 482 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 483 ies, ies_len); 484 485 if (end - pos < (int) sizeof(*rdie)) { 486 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 487 return pos; 488 } 489 490 *pos++ = WLAN_EID_RIC_DATA; 491 *pos++ = sizeof(*rdie); 492 rdie = (struct rsn_rdie *) pos; 493 rdie->id = id; 494 rdie->descr_count = 0; 495 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 496 pos += sizeof(*rdie); 497 498 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 499 ParseFailed) { 500 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 501 rdie->status_code = 502 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 503 return pos; 504 } 505 506 #ifdef NEED_AP_MLME 507 if (parse.wmm_tspec) { 508 struct wmm_tspec_element *tspec; 509 int res; 510 511 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 512 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 513 "(%d)", (int) parse.wmm_tspec_len); 514 rdie->status_code = 515 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 516 return pos; 517 } 518 if (end - pos < (int) sizeof(*tspec)) { 519 wpa_printf(MSG_ERROR, "FT: Not enough room for " 520 "response TSPEC"); 521 rdie->status_code = 522 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 523 return pos; 524 } 525 tspec = (struct wmm_tspec_element *) pos; 526 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 527 res = wmm_process_tspec(tspec); 528 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 529 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 530 rdie->status_code = 531 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 532 else if (res == WMM_ADDTS_STATUS_REFUSED) 533 rdie->status_code = 534 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 535 else { 536 /* TSPEC accepted; include updated TSPEC in response */ 537 rdie->descr_count = 1; 538 pos += sizeof(*tspec); 539 } 540 return pos; 541 } 542 #endif /* NEED_AP_MLME */ 543 544 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 545 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 546 return pos; 547 } 548 549 550 static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len) 551 { 552 const u8 *rpos, *start; 553 const struct rsn_rdie *rdie; 554 555 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 556 557 rpos = ric; 558 while (rpos + sizeof(*rdie) < ric + ric_len) { 559 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 560 rpos + 2 + rpos[1] > ric + ric_len) 561 break; 562 rdie = (const struct rsn_rdie *) (rpos + 2); 563 rpos += 2 + rpos[1]; 564 start = rpos; 565 566 while (rpos + 2 <= ric + ric_len && 567 rpos + 2 + rpos[1] <= ric + ric_len) { 568 if (rpos[0] == WLAN_EID_RIC_DATA) 569 break; 570 rpos += 2 + rpos[1]; 571 } 572 pos = wpa_ft_process_rdie(pos, end, rdie->id, 573 rdie->descr_count, 574 start, rpos - start); 575 } 576 577 return pos; 578 } 579 580 581 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 582 size_t max_len, int auth_alg, 583 const u8 *req_ies, size_t req_ies_len) 584 { 585 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 586 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 587 int res; 588 struct wpa_auth_config *conf; 589 struct rsn_ftie *_ftie; 590 struct wpa_ft_ies parse; 591 u8 *ric_start; 592 u8 *anonce, *snonce; 593 594 if (sm == NULL) 595 return pos; 596 597 conf = &sm->wpa_auth->conf; 598 599 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && 600 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK) 601 return pos; 602 603 end = pos + max_len; 604 605 if (auth_alg == WLAN_AUTH_FT) { 606 /* 607 * RSN (only present if this is a Reassociation Response and 608 * part of a fast BSS transition) 609 */ 610 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 611 if (res < 0) 612 return pos; 613 rsnie = pos; 614 rsnie_len = res; 615 pos += res; 616 } 617 618 /* Mobility Domain Information */ 619 res = wpa_write_mdie(conf, pos, end - pos); 620 if (res < 0) 621 return pos; 622 mdie = pos; 623 mdie_len = res; 624 pos += res; 625 626 /* Fast BSS Transition Information */ 627 if (auth_alg == WLAN_AUTH_FT) { 628 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 629 r0kh_id = sm->r0kh_id; 630 r0kh_id_len = sm->r0kh_id_len; 631 anonce = sm->ANonce; 632 snonce = sm->SNonce; 633 #ifdef CONFIG_IEEE80211W 634 if (sm->mgmt_frame_prot) { 635 u8 *igtk; 636 size_t igtk_len; 637 u8 *nbuf; 638 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 639 if (igtk == NULL) { 640 os_free(subelem); 641 return pos; 642 } 643 nbuf = os_realloc(subelem, subelem_len + igtk_len); 644 if (nbuf == NULL) { 645 os_free(subelem); 646 os_free(igtk); 647 return pos; 648 } 649 subelem = nbuf; 650 os_memcpy(subelem + subelem_len, igtk, igtk_len); 651 subelem_len += igtk_len; 652 os_free(igtk); 653 } 654 #endif /* CONFIG_IEEE80211W */ 655 } else { 656 r0kh_id = conf->r0_key_holder; 657 r0kh_id_len = conf->r0_key_holder_len; 658 anonce = NULL; 659 snonce = NULL; 660 } 661 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 662 end - pos, subelem, subelem_len); 663 os_free(subelem); 664 if (res < 0) 665 return pos; 666 ftie = pos; 667 ftie_len = res; 668 pos += res; 669 670 os_free(sm->assoc_resp_ftie); 671 sm->assoc_resp_ftie = os_malloc(ftie_len); 672 if (sm->assoc_resp_ftie) 673 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 674 675 _ftie = (struct rsn_ftie *) (ftie + 2); 676 if (auth_alg == WLAN_AUTH_FT) 677 _ftie->mic_control[1] = 3; /* Information element count */ 678 679 ric_start = pos; 680 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 681 pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len); 682 if (auth_alg == WLAN_AUTH_FT) 683 _ftie->mic_control[1] += 684 ieee802_11_ie_count(ric_start, 685 pos - ric_start); 686 } 687 if (ric_start == pos) 688 ric_start = NULL; 689 690 if (auth_alg == WLAN_AUTH_FT && 691 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6, 692 mdie, mdie_len, ftie, ftie_len, 693 rsnie, rsnie_len, 694 ric_start, ric_start ? pos - ric_start : 0, 695 _ftie->mic) < 0) 696 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 697 698 return pos; 699 } 700 701 702 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 703 int vlan_id, 704 enum wpa_alg alg, const u8 *addr, int idx, 705 u8 *key, size_t key_len) 706 { 707 if (wpa_auth->cb.set_key == NULL) 708 return -1; 709 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 710 key, key_len); 711 } 712 713 714 void wpa_ft_install_ptk(struct wpa_state_machine *sm) 715 { 716 enum wpa_alg alg; 717 int klen; 718 719 /* MLME-SETKEYS.request(PTK) */ 720 if (sm->pairwise == WPA_CIPHER_TKIP) { 721 alg = WPA_ALG_TKIP; 722 klen = 32; 723 } else if (sm->pairwise == WPA_CIPHER_CCMP) { 724 alg = WPA_ALG_CCMP; 725 klen = 16; 726 } else { 727 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 728 "PTK configuration", sm->pairwise); 729 return; 730 } 731 732 /* FIX: add STA entry to kernel/driver here? The set_key will fail 733 * most likely without this.. At the moment, STA entry is added only 734 * after association has been completed. This function will be called 735 * again after association to get the PTK configured, but that could be 736 * optimized by adding the STA entry earlier. 737 */ 738 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 739 sm->PTK.tk1, klen)) 740 return; 741 742 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 743 sm->pairwise_set = TRUE; 744 } 745 746 747 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm, 748 const u8 *ies, size_t ies_len, 749 u8 **resp_ies, size_t *resp_ies_len) 750 { 751 struct rsn_mdie *mdie; 752 struct rsn_ftie *ftie; 753 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 754 u8 ptk_name[WPA_PMK_NAME_LEN]; 755 struct wpa_auth_config *conf; 756 struct wpa_ft_ies parse; 757 size_t buflen, ptk_len; 758 int ret; 759 u8 *pos, *end; 760 int pairwise; 761 762 *resp_ies = NULL; 763 *resp_ies_len = 0; 764 765 sm->pmk_r1_name_valid = 0; 766 conf = &sm->wpa_auth->conf; 767 768 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 769 ies, ies_len); 770 771 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 772 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 773 return WLAN_STATUS_UNSPECIFIED_FAILURE; 774 } 775 776 mdie = (struct rsn_mdie *) parse.mdie; 777 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 778 os_memcmp(mdie->mobility_domain, 779 sm->wpa_auth->conf.mobility_domain, 780 MOBILITY_DOMAIN_ID_LEN) != 0) { 781 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 782 return WLAN_STATUS_INVALID_MDIE; 783 } 784 785 ftie = (struct rsn_ftie *) parse.ftie; 786 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 787 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 788 return WLAN_STATUS_INVALID_FTIE; 789 } 790 791 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 792 793 if (parse.r0kh_id == NULL) { 794 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 795 return WLAN_STATUS_INVALID_FTIE; 796 } 797 798 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 799 parse.r0kh_id, parse.r0kh_id_len); 800 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 801 sm->r0kh_id_len = parse.r0kh_id_len; 802 803 if (parse.rsn_pmkid == NULL) { 804 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 805 return WLAN_STATUS_INVALID_PMKID; 806 } 807 808 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 809 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 810 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 811 sm->wpa_auth->conf.r1_key_holder, sm->addr, 812 pmk_r1_name); 813 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 814 pmk_r1_name, WPA_PMK_NAME_LEN); 815 816 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 817 &pairwise) < 0) { 818 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id, 819 sm->r0kh_id_len, parse.rsn_pmkid) < 0) { 820 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 821 "PMK-R1 and unknown R0KH-ID"); 822 return WLAN_STATUS_INVALID_PMKID; 823 } 824 825 /* 826 * TODO: Should return "status pending" (and the caller should 827 * not send out response now). The real response will be sent 828 * once the response from R0KH is received. 829 */ 830 return WLAN_STATUS_INVALID_PMKID; 831 } 832 833 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 834 sm->pmk_r1_name_valid = 1; 835 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 836 837 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 838 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 839 "ANonce"); 840 return WLAN_STATUS_UNSPECIFIED_FAILURE; 841 } 842 843 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 844 sm->SNonce, WPA_NONCE_LEN); 845 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 846 sm->ANonce, WPA_NONCE_LEN); 847 848 ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48; 849 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 850 sm->wpa_auth->addr, pmk_r1_name, 851 (u8 *) &sm->PTK, ptk_len, ptk_name); 852 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 853 (u8 *) &sm->PTK, ptk_len); 854 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 855 856 sm->pairwise = pairwise; 857 wpa_ft_install_ptk(sm); 858 859 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 860 2 + FT_R1KH_ID_LEN + 200; 861 *resp_ies = os_zalloc(buflen); 862 if (*resp_ies == NULL) { 863 return WLAN_STATUS_UNSPECIFIED_FAILURE; 864 } 865 866 pos = *resp_ies; 867 end = *resp_ies + buflen; 868 869 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 870 if (ret < 0) { 871 os_free(*resp_ies); 872 *resp_ies = NULL; 873 return WLAN_STATUS_UNSPECIFIED_FAILURE; 874 } 875 pos += ret; 876 877 ret = wpa_write_mdie(conf, pos, end - pos); 878 if (ret < 0) { 879 os_free(*resp_ies); 880 *resp_ies = NULL; 881 return WLAN_STATUS_UNSPECIFIED_FAILURE; 882 } 883 pos += ret; 884 885 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 886 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 887 if (ret < 0) { 888 os_free(*resp_ies); 889 *resp_ies = NULL; 890 return WLAN_STATUS_UNSPECIFIED_FAILURE; 891 } 892 pos += ret; 893 894 *resp_ies_len = pos - *resp_ies; 895 896 return WLAN_STATUS_SUCCESS; 897 } 898 899 900 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 901 u16 auth_transaction, const u8 *ies, size_t ies_len, 902 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 903 u16 auth_transaction, u16 status, 904 const u8 *ies, size_t ies_len), 905 void *ctx) 906 { 907 u16 status; 908 u8 *resp_ies; 909 size_t resp_ies_len; 910 911 if (sm == NULL) { 912 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 913 "WPA SM not available"); 914 return; 915 } 916 917 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 918 " BSSID=" MACSTR " transaction=%d", 919 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 920 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 921 &resp_ies_len); 922 923 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 924 " auth_transaction=%d status=%d", 925 MAC2STR(sm->addr), auth_transaction + 1, status); 926 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 927 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 928 resp_ies, resp_ies_len); 929 os_free(resp_ies); 930 } 931 932 933 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 934 size_t ies_len) 935 { 936 struct wpa_ft_ies parse; 937 struct rsn_mdie *mdie; 938 struct rsn_ftie *ftie; 939 u8 mic[16]; 940 unsigned int count; 941 942 if (sm == NULL) 943 return WLAN_STATUS_UNSPECIFIED_FAILURE; 944 945 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 946 947 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 948 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 949 return WLAN_STATUS_UNSPECIFIED_FAILURE; 950 } 951 952 if (parse.rsn == NULL) { 953 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 954 return WLAN_STATUS_UNSPECIFIED_FAILURE; 955 } 956 957 if (parse.rsn_pmkid == NULL) { 958 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 959 return WLAN_STATUS_INVALID_PMKID; 960 } 961 962 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) 963 { 964 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 965 "with the PMKR1Name derived from auth request"); 966 return WLAN_STATUS_INVALID_PMKID; 967 } 968 969 mdie = (struct rsn_mdie *) parse.mdie; 970 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 971 os_memcmp(mdie->mobility_domain, 972 sm->wpa_auth->conf.mobility_domain, 973 MOBILITY_DOMAIN_ID_LEN) != 0) { 974 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 975 return WLAN_STATUS_INVALID_MDIE; 976 } 977 978 ftie = (struct rsn_ftie *) parse.ftie; 979 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 980 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 981 return WLAN_STATUS_INVALID_FTIE; 982 } 983 984 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 985 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 986 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 987 ftie->snonce, WPA_NONCE_LEN); 988 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 989 sm->SNonce, WPA_NONCE_LEN); 990 return -1; 991 } 992 993 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 994 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 995 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 996 ftie->anonce, WPA_NONCE_LEN); 997 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 998 sm->ANonce, WPA_NONCE_LEN); 999 return -1; 1000 } 1001 1002 1003 if (parse.r0kh_id == NULL) { 1004 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1005 return -1; 1006 } 1007 1008 if (parse.r0kh_id_len != sm->r0kh_id_len || 1009 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 1010 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1011 "the current R0KH-ID"); 1012 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1013 parse.r0kh_id, parse.r0kh_id_len); 1014 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1015 sm->r0kh_id, sm->r0kh_id_len); 1016 return -1; 1017 } 1018 1019 if (parse.r1kh_id == NULL) { 1020 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1021 return -1; 1022 } 1023 1024 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1025 FT_R1KH_ID_LEN) != 0) { 1026 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1027 "ReassocReq"); 1028 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1029 parse.r1kh_id, FT_R1KH_ID_LEN); 1030 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1031 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1032 return -1; 1033 } 1034 1035 if (parse.rsn_pmkid == NULL || 1036 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 1037 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1038 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1039 return -1; 1040 } 1041 1042 count = 3; 1043 if (parse.ric) 1044 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1045 if (ftie->mic_control[1] != count) { 1046 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1047 "Control: received %u expected %u", 1048 ftie->mic_control[1], count); 1049 return -1; 1050 } 1051 1052 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5, 1053 parse.mdie - 2, parse.mdie_len + 2, 1054 parse.ftie - 2, parse.ftie_len + 2, 1055 parse.rsn - 2, parse.rsn_len + 2, 1056 parse.ric, parse.ric_len, 1057 mic) < 0) { 1058 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1059 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1060 } 1061 1062 if (os_memcmp(mic, ftie->mic, 16) != 0) { 1063 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1064 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 1065 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 1066 return WLAN_STATUS_INVALID_FTIE; 1067 } 1068 1069 return WLAN_STATUS_SUCCESS; 1070 } 1071 1072 1073 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1074 { 1075 const u8 *sta_addr, *target_ap; 1076 const u8 *ies; 1077 size_t ies_len; 1078 u8 action; 1079 struct ft_rrb_frame *frame; 1080 1081 if (sm == NULL) 1082 return -1; 1083 1084 /* 1085 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1086 * FT Request action frame body[variable] 1087 */ 1088 1089 if (len < 14) { 1090 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1091 "(len=%lu)", (unsigned long) len); 1092 return -1; 1093 } 1094 1095 action = data[1]; 1096 sta_addr = data + 2; 1097 target_ap = data + 8; 1098 ies = data + 14; 1099 ies_len = len - 14; 1100 1101 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1102 " Target AP=" MACSTR " Action=%d)", 1103 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1104 1105 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1106 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1107 "STA=" MACSTR " STA-Address=" MACSTR, 1108 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1109 return -1; 1110 } 1111 1112 /* 1113 * Do some sanity checking on the target AP address (not own and not 1114 * broadcast. This could be extended to filter based on a list of known 1115 * APs in the MD (if such a list were configured). 1116 */ 1117 if ((target_ap[0] & 0x01) || 1118 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1119 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1120 "frame"); 1121 return -1; 1122 } 1123 1124 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1125 1126 /* RRB - Forward action frame to the target AP */ 1127 frame = os_malloc(sizeof(*frame) + len); 1128 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1129 frame->packet_type = FT_PACKET_REQUEST; 1130 frame->action_length = host_to_le16(len); 1131 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1132 os_memcpy(frame + 1, data, len); 1133 1134 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1135 sizeof(*frame) + len); 1136 os_free(frame); 1137 1138 return 0; 1139 } 1140 1141 1142 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1143 const u8 *current_ap, const u8 *sta_addr, 1144 const u8 *body, size_t len) 1145 { 1146 struct wpa_state_machine *sm; 1147 u16 status; 1148 u8 *resp_ies, *pos; 1149 size_t resp_ies_len, rlen; 1150 struct ft_rrb_frame *frame; 1151 1152 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1153 if (sm == NULL) { 1154 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1155 "RRB Request"); 1156 return -1; 1157 } 1158 1159 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1160 1161 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1162 &resp_ies_len); 1163 1164 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1165 " CurrentAP=" MACSTR " status=%d", 1166 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1167 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1168 1169 /* RRB - Forward action frame response to the Current AP */ 1170 1171 /* 1172 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1173 * Status_Code[2] FT Request action frame body[variable] 1174 */ 1175 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1176 1177 frame = os_malloc(sizeof(*frame) + rlen); 1178 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1179 frame->packet_type = FT_PACKET_RESPONSE; 1180 frame->action_length = host_to_le16(rlen); 1181 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1182 pos = (u8 *) (frame + 1); 1183 *pos++ = WLAN_ACTION_FT; 1184 *pos++ = 2; /* Action: Response */ 1185 os_memcpy(pos, sta_addr, ETH_ALEN); 1186 pos += ETH_ALEN; 1187 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1188 pos += ETH_ALEN; 1189 WPA_PUT_LE16(pos, status); 1190 pos += 2; 1191 if (resp_ies) { 1192 os_memcpy(pos, resp_ies, resp_ies_len); 1193 os_free(resp_ies); 1194 } 1195 1196 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1197 sizeof(*frame) + rlen); 1198 os_free(frame); 1199 1200 return 0; 1201 } 1202 1203 1204 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1205 const u8 *src_addr, 1206 const u8 *data, size_t data_len) 1207 { 1208 struct ft_r0kh_r1kh_pull_frame *frame, f; 1209 struct ft_remote_r1kh *r1kh; 1210 struct ft_r0kh_r1kh_resp_frame resp, r; 1211 u8 pmk_r0[PMK_LEN]; 1212 int pairwise; 1213 1214 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1215 1216 if (data_len < sizeof(*frame)) 1217 return -1; 1218 1219 r1kh = wpa_auth->conf.r1kh_list; 1220 while (r1kh) { 1221 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1222 break; 1223 r1kh = r1kh->next; 1224 } 1225 if (r1kh == NULL) { 1226 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1227 "PMK-R1 pull source address " MACSTR, 1228 MAC2STR(src_addr)); 1229 return -1; 1230 } 1231 1232 frame = (struct ft_r0kh_r1kh_pull_frame *) data; 1233 /* aes_unwrap() does not support inplace decryption, so use a temporary 1234 * buffer for the data. */ 1235 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1236 frame->nonce, f.nonce) < 0) { 1237 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1238 "request from " MACSTR, MAC2STR(src_addr)); 1239 return -1; 1240 } 1241 1242 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1243 f.nonce, sizeof(f.nonce)); 1244 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1245 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1246 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" 1247 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1248 1249 os_memset(&resp, 0, sizeof(resp)); 1250 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1251 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1252 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1253 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1254 1255 /* aes_wrap() does not support inplace encryption, so use a temporary 1256 * buffer for the data. */ 1257 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1258 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1259 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1260 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1261 &pairwise) < 0) { 1262 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1263 "PMK-R1 pull"); 1264 return -1; 1265 } 1266 1267 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1268 r.pmk_r1, r.pmk_r1_name); 1269 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1270 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1271 WPA_PMK_NAME_LEN); 1272 r.pairwise = host_to_le16(pairwise); 1273 1274 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1275 r.nonce, resp.nonce) < 0) { 1276 os_memset(pmk_r0, 0, PMK_LEN); 1277 return -1; 1278 } 1279 1280 os_memset(pmk_r0, 0, PMK_LEN); 1281 1282 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1283 1284 return 0; 1285 } 1286 1287 1288 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1289 const u8 *src_addr, 1290 const u8 *data, size_t data_len) 1291 { 1292 struct ft_r0kh_r1kh_resp_frame *frame, f; 1293 struct ft_remote_r0kh *r0kh; 1294 int pairwise; 1295 1296 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1297 1298 if (data_len < sizeof(*frame)) 1299 return -1; 1300 1301 r0kh = wpa_auth->conf.r0kh_list; 1302 while (r0kh) { 1303 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1304 break; 1305 r0kh = r0kh->next; 1306 } 1307 if (r0kh == NULL) { 1308 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1309 "PMK-R0 pull response source address " MACSTR, 1310 MAC2STR(src_addr)); 1311 return -1; 1312 } 1313 1314 frame = (struct ft_r0kh_r1kh_resp_frame *) data; 1315 /* aes_unwrap() does not support inplace decryption, so use a temporary 1316 * buffer for the data. */ 1317 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1318 frame->nonce, f.nonce) < 0) { 1319 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1320 "response from " MACSTR, MAC2STR(src_addr)); 1321 return -1; 1322 } 1323 1324 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1325 != 0) { 1326 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1327 "matching R1KH-ID"); 1328 return -1; 1329 } 1330 1331 /* TODO: verify that <nonce,s1kh_id> matches with a pending request 1332 * and call this requests callback function to finish request 1333 * processing */ 1334 1335 pairwise = le_to_host16(f.pairwise); 1336 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1337 f.nonce, sizeof(f.nonce)); 1338 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" 1339 MACSTR " pairwise=0x%x", 1340 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1341 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1342 f.pmk_r1, PMK_LEN); 1343 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1344 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1345 1346 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1347 pairwise); 1348 os_memset(f.pmk_r1, 0, PMK_LEN); 1349 1350 return 0; 1351 } 1352 1353 1354 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1355 const u8 *src_addr, 1356 const u8 *data, size_t data_len) 1357 { 1358 struct ft_r0kh_r1kh_push_frame *frame, f; 1359 struct ft_remote_r0kh *r0kh; 1360 struct os_time now; 1361 os_time_t tsend; 1362 int pairwise; 1363 1364 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1365 1366 if (data_len < sizeof(*frame)) 1367 return -1; 1368 1369 r0kh = wpa_auth->conf.r0kh_list; 1370 while (r0kh) { 1371 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1372 break; 1373 r0kh = r0kh->next; 1374 } 1375 if (r0kh == NULL) { 1376 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1377 "PMK-R0 push source address " MACSTR, 1378 MAC2STR(src_addr)); 1379 return -1; 1380 } 1381 1382 frame = (struct ft_r0kh_r1kh_push_frame *) data; 1383 /* aes_unwrap() does not support inplace decryption, so use a temporary 1384 * buffer for the data. */ 1385 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1386 frame->timestamp, f.timestamp) < 0) { 1387 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1388 MACSTR, MAC2STR(src_addr)); 1389 return -1; 1390 } 1391 1392 os_get_time(&now); 1393 tsend = WPA_GET_LE32(f.timestamp); 1394 if ((now.sec > tsend && now.sec - tsend > 60) || 1395 (now.sec < tsend && tsend - now.sec > 60)) { 1396 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1397 "timestamp: sender time %d own time %d\n", 1398 (int) tsend, (int) now.sec); 1399 return -1; 1400 } 1401 1402 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1403 != 0) { 1404 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1405 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1406 MAC2STR(f.r1kh_id), 1407 MAC2STR(wpa_auth->conf.r1_key_holder)); 1408 return -1; 1409 } 1410 1411 pairwise = le_to_host16(f.pairwise); 1412 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1413 MACSTR " pairwise=0x%x", 1414 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1415 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1416 f.pmk_r1, PMK_LEN); 1417 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1418 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1419 1420 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1421 pairwise); 1422 os_memset(f.pmk_r1, 0, PMK_LEN); 1423 1424 return 0; 1425 } 1426 1427 1428 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1429 const u8 *data, size_t data_len) 1430 { 1431 struct ft_rrb_frame *frame; 1432 u16 alen; 1433 const u8 *pos, *end, *start; 1434 u8 action; 1435 const u8 *sta_addr, *target_ap_addr; 1436 1437 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1438 MAC2STR(src_addr)); 1439 1440 if (data_len < sizeof(*frame)) { 1441 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1442 (unsigned long) data_len); 1443 return -1; 1444 } 1445 1446 pos = data; 1447 frame = (struct ft_rrb_frame *) pos; 1448 pos += sizeof(*frame); 1449 1450 alen = le_to_host16(frame->action_length); 1451 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1452 "action_length=%d ap_address=" MACSTR, 1453 frame->frame_type, frame->packet_type, alen, 1454 MAC2STR(frame->ap_address)); 1455 1456 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1457 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1458 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1459 "unrecognized type %d", frame->frame_type); 1460 return -1; 1461 } 1462 1463 if (alen > data_len - sizeof(*frame)) { 1464 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1465 "frame"); 1466 return -1; 1467 } 1468 1469 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1470 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1471 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1472 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1473 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1474 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1475 1476 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1477 1478 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1479 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1480 "room for Action Frame body); alen=%lu", 1481 (unsigned long) alen); 1482 return -1; 1483 } 1484 start = pos; 1485 end = pos + alen; 1486 1487 if (*pos != WLAN_ACTION_FT) { 1488 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1489 "%d", *pos); 1490 return -1; 1491 } 1492 1493 pos++; 1494 action = *pos++; 1495 sta_addr = pos; 1496 pos += ETH_ALEN; 1497 target_ap_addr = pos; 1498 pos += ETH_ALEN; 1499 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1500 MACSTR " target_ap_addr=" MACSTR, 1501 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1502 1503 if (frame->packet_type == FT_PACKET_REQUEST) { 1504 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1505 1506 if (action != 1) { 1507 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1508 "RRB Request", action); 1509 return -1; 1510 } 1511 1512 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1513 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1514 "RRB Request does not match with own " 1515 "address"); 1516 return -1; 1517 } 1518 1519 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1520 sta_addr, pos, end - pos) < 0) 1521 return -1; 1522 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1523 u16 status_code; 1524 1525 if (end - pos < 2) { 1526 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1527 "code in RRB Response"); 1528 return -1; 1529 } 1530 status_code = WPA_GET_LE16(pos); 1531 pos += 2; 1532 1533 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1534 "(status_code=%d)", status_code); 1535 1536 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1537 return -1; 1538 } else { 1539 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1540 "packet_type %d", frame->packet_type); 1541 return -1; 1542 } 1543 1544 return 0; 1545 } 1546 1547 1548 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1549 struct wpa_ft_pmk_r0_sa *pmk_r0, 1550 struct ft_remote_r1kh *r1kh, 1551 const u8 *s1kh_id, int pairwise) 1552 { 1553 struct ft_r0kh_r1kh_push_frame frame, f; 1554 struct os_time now; 1555 1556 os_memset(&frame, 0, sizeof(frame)); 1557 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1558 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1559 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1560 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1561 1562 /* aes_wrap() does not support inplace encryption, so use a temporary 1563 * buffer for the data. */ 1564 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1565 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1566 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1567 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1568 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1569 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1570 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1571 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1572 WPA_PMK_NAME_LEN); 1573 os_get_time(&now); 1574 WPA_PUT_LE32(f.timestamp, now.sec); 1575 f.pairwise = host_to_le16(pairwise); 1576 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1577 f.timestamp, frame.timestamp) < 0) 1578 return; 1579 1580 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1581 } 1582 1583 1584 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1585 { 1586 struct wpa_ft_pmk_r0_sa *r0; 1587 struct ft_remote_r1kh *r1kh; 1588 1589 if (!wpa_auth->conf.pmk_r1_push) 1590 return; 1591 1592 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1593 while (r0) { 1594 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1595 break; 1596 r0 = r0->next; 1597 } 1598 1599 if (r0 == NULL || r0->pmk_r1_pushed) 1600 return; 1601 r0->pmk_r1_pushed = 1; 1602 1603 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1604 "for STA " MACSTR, MAC2STR(addr)); 1605 1606 r1kh = wpa_auth->conf.r1kh_list; 1607 while (r1kh) { 1608 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1609 r1kh = r1kh->next; 1610 } 1611 } 1612 1613 #endif /* CONFIG_IEEE80211R */ 1614
