wpa_auth_ft.c revision d11f019d62a42a8fc4c4d1f2ec17cf35b0763153
1/* 2 * hostapd - IEEE 802.11r - Fast BSS Transition 3 * Copyright (c) 2004-2014, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#include "utils/includes.h" 10 11#include "utils/common.h" 12#include "utils/eloop.h" 13#include "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 26static 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 32static 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 43static 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 53static struct wpa_state_machine * 54wpa_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 62static 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 75int 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 95int 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 144struct 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 154struct 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 163struct wpa_ft_pmk_cache { 164 struct wpa_ft_pmk_r0_sa *pmk_r0; 165 struct wpa_ft_pmk_r1_sa *pmk_r1; 166}; 167 168struct 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 178void 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 203static 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 228static 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(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN) 239 == 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 253static 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 278static 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(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN) 289 == 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 303static 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(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) == 0) 314 break; 315 r0kh = r0kh->next; 316 } 317 if (r0kh == NULL) { 318 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID", 319 sm->r0kh_id, sm->r0kh_id_len); 320 return -1; 321 } 322 323 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " 324 "address " MACSTR, MAC2STR(r0kh->addr)); 325 326 os_memset(&frame, 0, sizeof(frame)); 327 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 328 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; 329 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); 330 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN); 331 332 /* aes_wrap() does not support inplace encryption, so use a temporary 333 * buffer for the data. */ 334 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) { 335 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 336 "nonce"); 337 return -1; 338 } 339 os_memcpy(sm->ft_pending_pull_nonce, f.nonce, 340 FT_R0KH_R1KH_PULL_NONCE_LEN); 341 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); 342 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 343 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN); 344 os_memset(f.pad, 0, sizeof(f.pad)); 345 346 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 347 f.nonce, frame.nonce) < 0) 348 return -1; 349 350 wpabuf_free(sm->ft_pending_req_ies); 351 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len); 352 if (sm->ft_pending_req_ies == NULL) 353 return -1; 354 355 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); 356 357 return 0; 358} 359 360 361int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, 362 struct wpa_ptk *ptk, size_t ptk_len) 363{ 364 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; 365 u8 pmk_r1[PMK_LEN]; 366 u8 ptk_name[WPA_PMK_NAME_LEN]; 367 const u8 *mdid = sm->wpa_auth->conf.mobility_domain; 368 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; 369 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; 370 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; 371 const u8 *ssid = sm->wpa_auth->conf.ssid; 372 size_t ssid_len = sm->wpa_auth->conf.ssid_len; 373 374 375 if (sm->xxkey_len == 0) { 376 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " 377 "derivation"); 378 return -1; 379 } 380 381 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, 382 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); 383 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); 384 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); 385 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name, 386 sm->pairwise); 387 388 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, 389 pmk_r1, sm->pmk_r1_name); 390 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); 391 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, 392 WPA_PMK_NAME_LEN); 393 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name, 394 sm->pairwise); 395 396 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 397 sm->wpa_auth->addr, sm->pmk_r1_name, 398 (u8 *) ptk, ptk_len, ptk_name); 399 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); 400 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 401 402 return 0; 403} 404 405 406static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, 407 const u8 *addr, int idx, u8 *seq) 408{ 409 if (wpa_auth->cb.get_seqnum == NULL) 410 return -1; 411 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); 412} 413 414 415static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) 416{ 417 u8 *subelem; 418 struct wpa_group *gsm = sm->group; 419 size_t subelem_len, pad_len; 420 const u8 *key; 421 size_t key_len; 422 u8 keybuf[32]; 423 424 key_len = gsm->GTK_len; 425 if (key_len > sizeof(keybuf)) 426 return NULL; 427 428 /* 429 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less 430 * than 16 bytes. 431 */ 432 pad_len = key_len % 8; 433 if (pad_len) 434 pad_len = 8 - pad_len; 435 if (key_len + pad_len < 16) 436 pad_len += 8; 437 if (pad_len && key_len < sizeof(keybuf)) { 438 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); 439 os_memset(keybuf + key_len, 0, pad_len); 440 keybuf[key_len] = 0xdd; 441 key_len += pad_len; 442 key = keybuf; 443 } else 444 key = gsm->GTK[gsm->GN - 1]; 445 446 /* 447 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | 448 * Key[5..32]. 449 */ 450 subelem_len = 13 + key_len + 8; 451 subelem = os_zalloc(subelem_len); 452 if (subelem == NULL) 453 return NULL; 454 455 subelem[0] = FTIE_SUBELEM_GTK; 456 subelem[1] = 11 + key_len + 8; 457 /* Key ID in B0-B1 of Key Info */ 458 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); 459 subelem[4] = gsm->GTK_len; 460 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); 461 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) { 462 os_free(subelem); 463 return NULL; 464 } 465 466 *len = subelem_len; 467 return subelem; 468} 469 470 471#ifdef CONFIG_IEEE80211W 472static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) 473{ 474 u8 *subelem, *pos; 475 struct wpa_group *gsm = sm->group; 476 size_t subelem_len; 477 478 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | 479 * Key[16+8] */ 480 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; 481 subelem = os_zalloc(subelem_len); 482 if (subelem == NULL) 483 return NULL; 484 485 pos = subelem; 486 *pos++ = FTIE_SUBELEM_IGTK; 487 *pos++ = subelem_len - 2; 488 WPA_PUT_LE16(pos, gsm->GN_igtk); 489 pos += 2; 490 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); 491 pos += 6; 492 *pos++ = WPA_IGTK_LEN; 493 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, 494 gsm->IGTK[gsm->GN_igtk - 4], pos)) { 495 os_free(subelem); 496 return NULL; 497 } 498 499 *len = subelem_len; 500 return subelem; 501} 502#endif /* CONFIG_IEEE80211W */ 503 504 505static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm, 506 u8 *pos, u8 *end, u8 id, u8 descr_count, 507 const u8 *ies, size_t ies_len) 508{ 509 struct ieee802_11_elems parse; 510 struct rsn_rdie *rdie; 511 512 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", 513 id, descr_count); 514 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", 515 ies, ies_len); 516 517 if (end - pos < (int) sizeof(*rdie)) { 518 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); 519 return pos; 520 } 521 522 *pos++ = WLAN_EID_RIC_DATA; 523 *pos++ = sizeof(*rdie); 524 rdie = (struct rsn_rdie *) pos; 525 rdie->id = id; 526 rdie->descr_count = 0; 527 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); 528 pos += sizeof(*rdie); 529 530 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == 531 ParseFailed) { 532 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); 533 rdie->status_code = 534 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 535 return pos; 536 } 537 538#ifdef NEED_AP_MLME 539 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { 540 struct wmm_tspec_element *tspec; 541 int res; 542 543 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { 544 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " 545 "(%d)", (int) parse.wmm_tspec_len); 546 rdie->status_code = 547 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 548 return pos; 549 } 550 if (end - pos < (int) sizeof(*tspec)) { 551 wpa_printf(MSG_ERROR, "FT: Not enough room for " 552 "response TSPEC"); 553 rdie->status_code = 554 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 555 return pos; 556 } 557 tspec = (struct wmm_tspec_element *) pos; 558 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 559 res = wmm_process_tspec(tspec); 560 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); 561 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) 562 rdie->status_code = 563 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); 564 else if (res == WMM_ADDTS_STATUS_REFUSED) 565 rdie->status_code = 566 host_to_le16(WLAN_STATUS_REQUEST_DECLINED); 567 else { 568 /* TSPEC accepted; include updated TSPEC in response */ 569 rdie->descr_count = 1; 570 pos += sizeof(*tspec); 571 } 572 return pos; 573 } 574#endif /* NEED_AP_MLME */ 575 576 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { 577 struct wmm_tspec_element *tspec; 578 int res; 579 580 tspec = (struct wmm_tspec_element *) pos; 581 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); 582 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, 583 sizeof(*tspec)); 584 if (res >= 0) { 585 if (res) 586 rdie->status_code = host_to_le16(res); 587 else { 588 /* TSPEC accepted; include updated TSPEC in 589 * response */ 590 rdie->descr_count = 1; 591 pos += sizeof(*tspec); 592 } 593 return pos; 594 } 595 } 596 597 wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); 598 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); 599 return pos; 600} 601 602 603static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, 604 const u8 *ric, size_t ric_len) 605{ 606 const u8 *rpos, *start; 607 const struct rsn_rdie *rdie; 608 609 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); 610 611 rpos = ric; 612 while (rpos + sizeof(*rdie) < ric + ric_len) { 613 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || 614 rpos + 2 + rpos[1] > ric + ric_len) 615 break; 616 rdie = (const struct rsn_rdie *) (rpos + 2); 617 rpos += 2 + rpos[1]; 618 start = rpos; 619 620 while (rpos + 2 <= ric + ric_len && 621 rpos + 2 + rpos[1] <= ric + ric_len) { 622 if (rpos[0] == WLAN_EID_RIC_DATA) 623 break; 624 rpos += 2 + rpos[1]; 625 } 626 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, 627 rdie->descr_count, 628 start, rpos - start); 629 } 630 631 return pos; 632} 633 634 635u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, 636 size_t max_len, int auth_alg, 637 const u8 *req_ies, size_t req_ies_len) 638{ 639 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; 640 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; 641 int res; 642 struct wpa_auth_config *conf; 643 struct rsn_ftie *_ftie; 644 struct wpa_ft_ies parse; 645 u8 *ric_start; 646 u8 *anonce, *snonce; 647 648 if (sm == NULL) 649 return pos; 650 651 conf = &sm->wpa_auth->conf; 652 653 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt)) 654 return pos; 655 656 end = pos + max_len; 657 658 if (auth_alg == WLAN_AUTH_FT) { 659 /* 660 * RSN (only present if this is a Reassociation Response and 661 * part of a fast BSS transition) 662 */ 663 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); 664 if (res < 0) 665 return pos; 666 rsnie = pos; 667 rsnie_len = res; 668 pos += res; 669 } 670 671 /* Mobility Domain Information */ 672 res = wpa_write_mdie(conf, pos, end - pos); 673 if (res < 0) 674 return pos; 675 mdie = pos; 676 mdie_len = res; 677 pos += res; 678 679 /* Fast BSS Transition Information */ 680 if (auth_alg == WLAN_AUTH_FT) { 681 subelem = wpa_ft_gtk_subelem(sm, &subelem_len); 682 r0kh_id = sm->r0kh_id; 683 r0kh_id_len = sm->r0kh_id_len; 684 anonce = sm->ANonce; 685 snonce = sm->SNonce; 686#ifdef CONFIG_IEEE80211W 687 if (sm->mgmt_frame_prot) { 688 u8 *igtk; 689 size_t igtk_len; 690 u8 *nbuf; 691 igtk = wpa_ft_igtk_subelem(sm, &igtk_len); 692 if (igtk == NULL) { 693 os_free(subelem); 694 return pos; 695 } 696 nbuf = os_realloc(subelem, subelem_len + igtk_len); 697 if (nbuf == NULL) { 698 os_free(subelem); 699 os_free(igtk); 700 return pos; 701 } 702 subelem = nbuf; 703 os_memcpy(subelem + subelem_len, igtk, igtk_len); 704 subelem_len += igtk_len; 705 os_free(igtk); 706 } 707#endif /* CONFIG_IEEE80211W */ 708 } else { 709 r0kh_id = conf->r0_key_holder; 710 r0kh_id_len = conf->r0_key_holder_len; 711 anonce = NULL; 712 snonce = NULL; 713 } 714 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos, 715 end - pos, subelem, subelem_len); 716 os_free(subelem); 717 if (res < 0) 718 return pos; 719 ftie = pos; 720 ftie_len = res; 721 pos += res; 722 723 os_free(sm->assoc_resp_ftie); 724 sm->assoc_resp_ftie = os_malloc(ftie_len); 725 if (sm->assoc_resp_ftie) 726 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); 727 728 _ftie = (struct rsn_ftie *) (ftie + 2); 729 if (auth_alg == WLAN_AUTH_FT) 730 _ftie->mic_control[1] = 3; /* Information element count */ 731 732 ric_start = pos; 733 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { 734 pos = wpa_ft_process_ric(sm, pos, end, parse.ric, 735 parse.ric_len); 736 if (auth_alg == WLAN_AUTH_FT) 737 _ftie->mic_control[1] += 738 ieee802_11_ie_count(ric_start, 739 pos - ric_start); 740 } 741 if (ric_start == pos) 742 ric_start = NULL; 743 744 if (auth_alg == WLAN_AUTH_FT && 745 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6, 746 mdie, mdie_len, ftie, ftie_len, 747 rsnie, rsnie_len, 748 ric_start, ric_start ? pos - ric_start : 0, 749 _ftie->mic) < 0) 750 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 751 752 return pos; 753} 754 755 756static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, 757 int vlan_id, 758 enum wpa_alg alg, const u8 *addr, int idx, 759 u8 *key, size_t key_len) 760{ 761 if (wpa_auth->cb.set_key == NULL) 762 return -1; 763 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, 764 key, key_len); 765} 766 767 768void wpa_ft_install_ptk(struct wpa_state_machine *sm) 769{ 770 enum wpa_alg alg; 771 int klen; 772 773 /* MLME-SETKEYS.request(PTK) */ 774 alg = wpa_cipher_to_alg(sm->pairwise); 775 klen = wpa_cipher_key_len(sm->pairwise); 776 if (!wpa_cipher_valid_pairwise(sm->pairwise)) { 777 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " 778 "PTK configuration", sm->pairwise); 779 return; 780 } 781 782 /* FIX: add STA entry to kernel/driver here? The set_key will fail 783 * most likely without this.. At the moment, STA entry is added only 784 * after association has been completed. This function will be called 785 * again after association to get the PTK configured, but that could be 786 * optimized by adding the STA entry earlier. 787 */ 788 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, 789 sm->PTK.tk1, klen)) 790 return; 791 792 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ 793 sm->pairwise_set = TRUE; 794} 795 796 797static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, 798 const u8 *ies, size_t ies_len, 799 u8 **resp_ies, size_t *resp_ies_len) 800{ 801 struct rsn_mdie *mdie; 802 struct rsn_ftie *ftie; 803 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; 804 u8 ptk_name[WPA_PMK_NAME_LEN]; 805 struct wpa_auth_config *conf; 806 struct wpa_ft_ies parse; 807 size_t buflen, ptk_len; 808 int ret; 809 u8 *pos, *end; 810 int pairwise; 811 812 *resp_ies = NULL; 813 *resp_ies_len = 0; 814 815 sm->pmk_r1_name_valid = 0; 816 conf = &sm->wpa_auth->conf; 817 818 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", 819 ies, ies_len); 820 821 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 822 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 823 return WLAN_STATUS_UNSPECIFIED_FAILURE; 824 } 825 826 mdie = (struct rsn_mdie *) parse.mdie; 827 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 828 os_memcmp(mdie->mobility_domain, 829 sm->wpa_auth->conf.mobility_domain, 830 MOBILITY_DOMAIN_ID_LEN) != 0) { 831 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 832 return WLAN_STATUS_INVALID_MDIE; 833 } 834 835 ftie = (struct rsn_ftie *) parse.ftie; 836 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 837 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 838 return WLAN_STATUS_INVALID_FTIE; 839 } 840 841 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); 842 843 if (parse.r0kh_id == NULL) { 844 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); 845 return WLAN_STATUS_INVALID_FTIE; 846 } 847 848 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", 849 parse.r0kh_id, parse.r0kh_id_len); 850 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 851 sm->r0kh_id_len = parse.r0kh_id_len; 852 853 if (parse.rsn_pmkid == NULL) { 854 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 855 return WLAN_STATUS_INVALID_PMKID; 856 } 857 858 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", 859 parse.rsn_pmkid, WPA_PMK_NAME_LEN); 860 wpa_derive_pmk_r1_name(parse.rsn_pmkid, 861 sm->wpa_auth->conf.r1_key_holder, sm->addr, 862 pmk_r1_name); 863 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", 864 pmk_r1_name, WPA_PMK_NAME_LEN); 865 866 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, 867 &pairwise) < 0) { 868 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { 869 wpa_printf(MSG_DEBUG, "FT: Did not have matching " 870 "PMK-R1 and unknown R0KH-ID"); 871 return WLAN_STATUS_INVALID_PMKID; 872 } 873 874 return -1; /* Status pending */ 875 } 876 877 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); 878 sm->pmk_r1_name_valid = 1; 879 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); 880 881 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { 882 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " 883 "ANonce"); 884 return WLAN_STATUS_UNSPECIFIED_FAILURE; 885 } 886 887 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 888 sm->SNonce, WPA_NONCE_LEN); 889 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", 890 sm->ANonce, WPA_NONCE_LEN); 891 892 ptk_len = pairwise == WPA_CIPHER_TKIP ? 64 : 48; 893 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, 894 sm->wpa_auth->addr, pmk_r1_name, 895 (u8 *) &sm->PTK, ptk_len, ptk_name); 896 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", 897 (u8 *) &sm->PTK, ptk_len); 898 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); 899 900 sm->pairwise = pairwise; 901 wpa_ft_install_ptk(sm); 902 903 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 904 2 + FT_R1KH_ID_LEN + 200; 905 *resp_ies = os_zalloc(buflen); 906 if (*resp_ies == NULL) { 907 return WLAN_STATUS_UNSPECIFIED_FAILURE; 908 } 909 910 pos = *resp_ies; 911 end = *resp_ies + buflen; 912 913 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); 914 if (ret < 0) { 915 os_free(*resp_ies); 916 *resp_ies = NULL; 917 return WLAN_STATUS_UNSPECIFIED_FAILURE; 918 } 919 pos += ret; 920 921 ret = wpa_write_mdie(conf, pos, end - pos); 922 if (ret < 0) { 923 os_free(*resp_ies); 924 *resp_ies = NULL; 925 return WLAN_STATUS_UNSPECIFIED_FAILURE; 926 } 927 pos += ret; 928 929 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, 930 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); 931 if (ret < 0) { 932 os_free(*resp_ies); 933 *resp_ies = NULL; 934 return WLAN_STATUS_UNSPECIFIED_FAILURE; 935 } 936 pos += ret; 937 938 *resp_ies_len = pos - *resp_ies; 939 940 return WLAN_STATUS_SUCCESS; 941} 942 943 944void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, 945 u16 auth_transaction, const u8 *ies, size_t ies_len, 946 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, 947 u16 auth_transaction, u16 status, 948 const u8 *ies, size_t ies_len), 949 void *ctx) 950{ 951 u16 status; 952 u8 *resp_ies; 953 size_t resp_ies_len; 954 int res; 955 956 if (sm == NULL) { 957 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " 958 "WPA SM not available"); 959 return; 960 } 961 962 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR 963 " BSSID=" MACSTR " transaction=%d", 964 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); 965 sm->ft_pending_cb = cb; 966 sm->ft_pending_cb_ctx = ctx; 967 sm->ft_pending_auth_transaction = auth_transaction; 968 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, 969 &resp_ies_len); 970 if (res < 0) { 971 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); 972 return; 973 } 974 status = res; 975 976 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR 977 " auth_transaction=%d status=%d", 978 MAC2STR(sm->addr), auth_transaction + 1, status); 979 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 980 cb(ctx, sm->addr, bssid, auth_transaction + 1, status, 981 resp_ies, resp_ies_len); 982 os_free(resp_ies); 983} 984 985 986u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, 987 size_t ies_len) 988{ 989 struct wpa_ft_ies parse; 990 struct rsn_mdie *mdie; 991 struct rsn_ftie *ftie; 992 u8 mic[16]; 993 unsigned int count; 994 995 if (sm == NULL) 996 return WLAN_STATUS_UNSPECIFIED_FAILURE; 997 998 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); 999 1000 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { 1001 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); 1002 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1003 } 1004 1005 if (parse.rsn == NULL) { 1006 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); 1007 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1008 } 1009 1010 if (parse.rsn_pmkid == NULL) { 1011 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); 1012 return WLAN_STATUS_INVALID_PMKID; 1013 } 1014 1015 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) 1016 { 1017 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " 1018 "with the PMKR1Name derived from auth request"); 1019 return WLAN_STATUS_INVALID_PMKID; 1020 } 1021 1022 mdie = (struct rsn_mdie *) parse.mdie; 1023 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || 1024 os_memcmp(mdie->mobility_domain, 1025 sm->wpa_auth->conf.mobility_domain, 1026 MOBILITY_DOMAIN_ID_LEN) != 0) { 1027 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); 1028 return WLAN_STATUS_INVALID_MDIE; 1029 } 1030 1031 ftie = (struct rsn_ftie *) parse.ftie; 1032 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { 1033 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); 1034 return WLAN_STATUS_INVALID_FTIE; 1035 } 1036 1037 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { 1038 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); 1039 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", 1040 ftie->snonce, WPA_NONCE_LEN); 1041 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", 1042 sm->SNonce, WPA_NONCE_LEN); 1043 return -1; 1044 } 1045 1046 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { 1047 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); 1048 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", 1049 ftie->anonce, WPA_NONCE_LEN); 1050 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", 1051 sm->ANonce, WPA_NONCE_LEN); 1052 return -1; 1053 } 1054 1055 1056 if (parse.r0kh_id == NULL) { 1057 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); 1058 return -1; 1059 } 1060 1061 if (parse.r0kh_id_len != sm->r0kh_id_len || 1062 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { 1063 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " 1064 "the current R0KH-ID"); 1065 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", 1066 parse.r0kh_id, parse.r0kh_id_len); 1067 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", 1068 sm->r0kh_id, sm->r0kh_id_len); 1069 return -1; 1070 } 1071 1072 if (parse.r1kh_id == NULL) { 1073 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); 1074 return -1; 1075 } 1076 1077 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder, 1078 FT_R1KH_ID_LEN) != 0) { 1079 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " 1080 "ReassocReq"); 1081 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", 1082 parse.r1kh_id, FT_R1KH_ID_LEN); 1083 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", 1084 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); 1085 return -1; 1086 } 1087 1088 if (parse.rsn_pmkid == NULL || 1089 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { 1090 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " 1091 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); 1092 return -1; 1093 } 1094 1095 count = 3; 1096 if (parse.ric) 1097 count += ieee802_11_ie_count(parse.ric, parse.ric_len); 1098 if (ftie->mic_control[1] != count) { 1099 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " 1100 "Control: received %u expected %u", 1101 ftie->mic_control[1], count); 1102 return -1; 1103 } 1104 1105 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5, 1106 parse.mdie - 2, parse.mdie_len + 2, 1107 parse.ftie - 2, parse.ftie_len + 2, 1108 parse.rsn - 2, parse.rsn_len + 2, 1109 parse.ric, parse.ric_len, 1110 mic) < 0) { 1111 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); 1112 return WLAN_STATUS_UNSPECIFIED_FAILURE; 1113 } 1114 1115 if (os_memcmp(mic, ftie->mic, 16) != 0) { 1116 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); 1117 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, 1118 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); 1119 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); 1120 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); 1121 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", 1122 parse.mdie - 2, parse.mdie_len + 2); 1123 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", 1124 parse.ftie - 2, parse.ftie_len + 2); 1125 wpa_hexdump(MSG_MSGDUMP, "FT: RSN", 1126 parse.rsn - 2, parse.rsn_len + 2); 1127 return WLAN_STATUS_INVALID_FTIE; 1128 } 1129 1130 return WLAN_STATUS_SUCCESS; 1131} 1132 1133 1134int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) 1135{ 1136 const u8 *sta_addr, *target_ap; 1137 const u8 *ies; 1138 size_t ies_len; 1139 u8 action; 1140 struct ft_rrb_frame *frame; 1141 1142 if (sm == NULL) 1143 return -1; 1144 1145 /* 1146 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1147 * FT Request action frame body[variable] 1148 */ 1149 1150 if (len < 14) { 1151 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " 1152 "(len=%lu)", (unsigned long) len); 1153 return -1; 1154 } 1155 1156 action = data[1]; 1157 sta_addr = data + 2; 1158 target_ap = data + 8; 1159 ies = data + 14; 1160 ies_len = len - 14; 1161 1162 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR 1163 " Target AP=" MACSTR " Action=%d)", 1164 MAC2STR(sta_addr), MAC2STR(target_ap), action); 1165 1166 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { 1167 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " 1168 "STA=" MACSTR " STA-Address=" MACSTR, 1169 MAC2STR(sm->addr), MAC2STR(sta_addr)); 1170 return -1; 1171 } 1172 1173 /* 1174 * Do some sanity checking on the target AP address (not own and not 1175 * broadcast. This could be extended to filter based on a list of known 1176 * APs in the MD (if such a list were configured). 1177 */ 1178 if ((target_ap[0] & 0x01) || 1179 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { 1180 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " 1181 "frame"); 1182 return -1; 1183 } 1184 1185 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); 1186 1187 /* RRB - Forward action frame to the target AP */ 1188 frame = os_malloc(sizeof(*frame) + len); 1189 if (frame == NULL) 1190 return -1; 1191 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1192 frame->packet_type = FT_PACKET_REQUEST; 1193 frame->action_length = host_to_le16(len); 1194 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); 1195 os_memcpy(frame + 1, data, len); 1196 1197 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, 1198 sizeof(*frame) + len); 1199 os_free(frame); 1200 1201 return 0; 1202} 1203 1204 1205static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid, 1206 u16 auth_transaction, u16 resp, 1207 const u8 *ies, size_t ies_len) 1208{ 1209 struct wpa_state_machine *sm = ctx; 1210 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR, 1211 MAC2STR(sm->addr)); 1212 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr, 1213 WLAN_STATUS_SUCCESS, ies, ies_len); 1214} 1215 1216 1217static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, 1218 const u8 *current_ap, const u8 *sta_addr, 1219 const u8 *body, size_t len) 1220{ 1221 struct wpa_state_machine *sm; 1222 u16 status; 1223 u8 *resp_ies; 1224 size_t resp_ies_len; 1225 int res; 1226 1227 sm = wpa_ft_add_sta(wpa_auth, sta_addr); 1228 if (sm == NULL) { 1229 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " 1230 "RRB Request"); 1231 return -1; 1232 } 1233 1234 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); 1235 1236 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb; 1237 sm->ft_pending_cb_ctx = sm; 1238 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN); 1239 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies, 1240 &resp_ies_len); 1241 if (res < 0) { 1242 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response"); 1243 return 0; 1244 } 1245 status = res; 1246 1247 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status, 1248 resp_ies, resp_ies_len); 1249 os_free(resp_ies); 1250 return res; 1251} 1252 1253 1254static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, 1255 const u8 *current_ap, const u8 *sta_addr, 1256 u16 status, const u8 *resp_ies, 1257 size_t resp_ies_len) 1258{ 1259 struct wpa_authenticator *wpa_auth = sm->wpa_auth; 1260 size_t rlen; 1261 struct ft_rrb_frame *frame; 1262 u8 *pos; 1263 1264 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR 1265 " CurrentAP=" MACSTR " status=%d", 1266 MAC2STR(sm->addr), MAC2STR(current_ap), status); 1267 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); 1268 1269 /* RRB - Forward action frame response to the Current AP */ 1270 1271 /* 1272 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] 1273 * Status_Code[2] FT Request action frame body[variable] 1274 */ 1275 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; 1276 1277 frame = os_malloc(sizeof(*frame) + rlen); 1278 if (frame == NULL) 1279 return -1; 1280 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1281 frame->packet_type = FT_PACKET_RESPONSE; 1282 frame->action_length = host_to_le16(rlen); 1283 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); 1284 pos = (u8 *) (frame + 1); 1285 *pos++ = WLAN_ACTION_FT; 1286 *pos++ = 2; /* Action: Response */ 1287 os_memcpy(pos, sta_addr, ETH_ALEN); 1288 pos += ETH_ALEN; 1289 os_memcpy(pos, wpa_auth->addr, ETH_ALEN); 1290 pos += ETH_ALEN; 1291 WPA_PUT_LE16(pos, status); 1292 pos += 2; 1293 if (resp_ies) 1294 os_memcpy(pos, resp_ies, resp_ies_len); 1295 1296 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, 1297 sizeof(*frame) + rlen); 1298 os_free(frame); 1299 1300 return 0; 1301} 1302 1303 1304static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, 1305 const u8 *src_addr, 1306 const u8 *data, size_t data_len) 1307{ 1308 struct ft_r0kh_r1kh_pull_frame *frame, f; 1309 struct ft_remote_r1kh *r1kh; 1310 struct ft_r0kh_r1kh_resp_frame resp, r; 1311 u8 pmk_r0[PMK_LEN]; 1312 int pairwise; 1313 1314 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); 1315 1316 if (data_len < sizeof(*frame)) 1317 return -1; 1318 1319 r1kh = wpa_auth->conf.r1kh_list; 1320 while (r1kh) { 1321 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) 1322 break; 1323 r1kh = r1kh->next; 1324 } 1325 if (r1kh == NULL) { 1326 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " 1327 "PMK-R1 pull source address " MACSTR, 1328 MAC2STR(src_addr)); 1329 return -1; 1330 } 1331 1332 frame = (struct ft_r0kh_r1kh_pull_frame *) data; 1333 /* aes_unwrap() does not support inplace decryption, so use a temporary 1334 * buffer for the data. */ 1335 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, 1336 frame->nonce, f.nonce) < 0) { 1337 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1338 "request from " MACSTR, MAC2STR(src_addr)); 1339 return -1; 1340 } 1341 1342 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1343 f.nonce, sizeof(f.nonce)); 1344 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", 1345 f.pmk_r0_name, WPA_PMK_NAME_LEN); 1346 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1347 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); 1348 1349 os_memset(&resp, 0, sizeof(resp)); 1350 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1351 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; 1352 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); 1353 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); 1354 1355 /* aes_wrap() does not support inplace encryption, so use a temporary 1356 * buffer for the data. */ 1357 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); 1358 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); 1359 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); 1360 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0, 1361 &pairwise) < 0) { 1362 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " 1363 "PMK-R1 pull"); 1364 return -1; 1365 } 1366 1367 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, 1368 r.pmk_r1, r.pmk_r1_name); 1369 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); 1370 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, 1371 WPA_PMK_NAME_LEN); 1372 r.pairwise = host_to_le16(pairwise); 1373 os_memset(r.pad, 0, sizeof(r.pad)); 1374 1375 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1376 r.nonce, resp.nonce) < 0) { 1377 os_memset(pmk_r0, 0, PMK_LEN); 1378 return -1; 1379 } 1380 1381 os_memset(pmk_r0, 0, PMK_LEN); 1382 1383 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); 1384 1385 return 0; 1386} 1387 1388 1389static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx) 1390{ 1391 struct wpa_state_machine *sm = eloop_ctx; 1392 int res; 1393 u8 *resp_ies; 1394 size_t resp_ies_len; 1395 u16 status; 1396 1397 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), 1398 wpabuf_len(sm->ft_pending_req_ies), 1399 &resp_ies, &resp_ies_len); 1400 wpabuf_free(sm->ft_pending_req_ies); 1401 sm->ft_pending_req_ies = NULL; 1402 if (res < 0) 1403 res = WLAN_STATUS_UNSPECIFIED_FAILURE; 1404 status = res; 1405 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR 1406 " - status %u", MAC2STR(sm->addr), status); 1407 1408 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, 1409 sm->ft_pending_auth_transaction + 1, status, 1410 resp_ies, resp_ies_len); 1411 os_free(resp_ies); 1412} 1413 1414 1415static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx) 1416{ 1417 struct ft_r0kh_r1kh_resp_frame *frame = ctx; 1418 1419 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0) 1420 return 0; 1421 if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce, 1422 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0) 1423 return 0; 1424 if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) 1425 return 0; 1426 1427 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " 1428 MACSTR " - process from timeout", MAC2STR(sm->addr)); 1429 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL); 1430 return 1; 1431} 1432 1433 1434static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, 1435 const u8 *src_addr, 1436 const u8 *data, size_t data_len) 1437{ 1438 struct ft_r0kh_r1kh_resp_frame *frame, f; 1439 struct ft_remote_r0kh *r0kh; 1440 int pairwise, res; 1441 1442 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); 1443 1444 if (data_len < sizeof(*frame)) 1445 return -1; 1446 1447 r0kh = wpa_auth->conf.r0kh_list; 1448 while (r0kh) { 1449 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1450 break; 1451 r0kh = r0kh->next; 1452 } 1453 if (r0kh == NULL) { 1454 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1455 "PMK-R0 pull response source address " MACSTR, 1456 MAC2STR(src_addr)); 1457 return -1; 1458 } 1459 1460 frame = (struct ft_r0kh_r1kh_resp_frame *) data; 1461 /* aes_unwrap() does not support inplace decryption, so use a temporary 1462 * buffer for the data. */ 1463 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, 1464 frame->nonce, f.nonce) < 0) { 1465 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " 1466 "response from " MACSTR, MAC2STR(src_addr)); 1467 return -1; 1468 } 1469 1470 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1471 != 0) { 1472 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " 1473 "matching R1KH-ID"); 1474 return -1; 1475 } 1476 1477 pairwise = le_to_host16(f.pairwise); 1478 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", 1479 f.nonce, sizeof(f.nonce)); 1480 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID=" 1481 MACSTR " pairwise=0x%x", 1482 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1483 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", 1484 f.pmk_r1, PMK_LEN); 1485 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", 1486 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1487 1488 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1489 pairwise); 1490 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request"); 1491 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f); 1492 os_memset(f.pmk_r1, 0, PMK_LEN); 1493 1494 return res ? 0 : -1; 1495} 1496 1497 1498static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, 1499 const u8 *src_addr, 1500 const u8 *data, size_t data_len) 1501{ 1502 struct ft_r0kh_r1kh_push_frame *frame, f; 1503 struct ft_remote_r0kh *r0kh; 1504 struct os_time now; 1505 os_time_t tsend; 1506 int pairwise; 1507 1508 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); 1509 1510 if (data_len < sizeof(*frame)) 1511 return -1; 1512 1513 r0kh = wpa_auth->conf.r0kh_list; 1514 while (r0kh) { 1515 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) 1516 break; 1517 r0kh = r0kh->next; 1518 } 1519 if (r0kh == NULL) { 1520 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " 1521 "PMK-R0 push source address " MACSTR, 1522 MAC2STR(src_addr)); 1523 return -1; 1524 } 1525 1526 frame = (struct ft_r0kh_r1kh_push_frame *) data; 1527 /* aes_unwrap() does not support inplace decryption, so use a temporary 1528 * buffer for the data. */ 1529 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1530 frame->timestamp, f.timestamp) < 0) { 1531 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " 1532 MACSTR, MAC2STR(src_addr)); 1533 return -1; 1534 } 1535 1536 os_get_time(&now); 1537 tsend = WPA_GET_LE32(f.timestamp); 1538 if ((now.sec > tsend && now.sec - tsend > 60) || 1539 (now.sec < tsend && tsend - now.sec > 60)) { 1540 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " 1541 "timestamp: sender time %d own time %d\n", 1542 (int) tsend, (int) now.sec); 1543 return -1; 1544 } 1545 1546 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) 1547 != 0) { 1548 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " 1549 "R1KH-ID (received " MACSTR " own " MACSTR ")", 1550 MAC2STR(f.r1kh_id), 1551 MAC2STR(wpa_auth->conf.r1_key_holder)); 1552 return -1; 1553 } 1554 1555 pairwise = le_to_host16(f.pairwise); 1556 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" 1557 MACSTR " pairwise=0x%x", 1558 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise); 1559 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", 1560 f.pmk_r1, PMK_LEN); 1561 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", 1562 f.pmk_r1_name, WPA_PMK_NAME_LEN); 1563 1564 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name, 1565 pairwise); 1566 os_memset(f.pmk_r1, 0, PMK_LEN); 1567 1568 return 0; 1569} 1570 1571 1572int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, 1573 const u8 *data, size_t data_len) 1574{ 1575 struct ft_rrb_frame *frame; 1576 u16 alen; 1577 const u8 *pos, *end, *start; 1578 u8 action; 1579 const u8 *sta_addr, *target_ap_addr; 1580 1581 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, 1582 MAC2STR(src_addr)); 1583 1584 if (data_len < sizeof(*frame)) { 1585 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", 1586 (unsigned long) data_len); 1587 return -1; 1588 } 1589 1590 pos = data; 1591 frame = (struct ft_rrb_frame *) pos; 1592 pos += sizeof(*frame); 1593 1594 alen = le_to_host16(frame->action_length); 1595 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " 1596 "action_length=%d ap_address=" MACSTR, 1597 frame->frame_type, frame->packet_type, alen, 1598 MAC2STR(frame->ap_address)); 1599 1600 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { 1601 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ 1602 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " 1603 "unrecognized type %d", frame->frame_type); 1604 return -1; 1605 } 1606 1607 if (alen > data_len - sizeof(*frame)) { 1608 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " 1609 "frame"); 1610 return -1; 1611 } 1612 1613 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) 1614 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); 1615 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) 1616 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); 1617 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) 1618 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); 1619 1620 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); 1621 1622 if (alen < 1 + 1 + 2 * ETH_ALEN) { 1623 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " 1624 "room for Action Frame body); alen=%lu", 1625 (unsigned long) alen); 1626 return -1; 1627 } 1628 start = pos; 1629 end = pos + alen; 1630 1631 if (*pos != WLAN_ACTION_FT) { 1632 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " 1633 "%d", *pos); 1634 return -1; 1635 } 1636 1637 pos++; 1638 action = *pos++; 1639 sta_addr = pos; 1640 pos += ETH_ALEN; 1641 target_ap_addr = pos; 1642 pos += ETH_ALEN; 1643 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" 1644 MACSTR " target_ap_addr=" MACSTR, 1645 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); 1646 1647 if (frame->packet_type == FT_PACKET_REQUEST) { 1648 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); 1649 1650 if (action != 1) { 1651 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " 1652 "RRB Request", action); 1653 return -1; 1654 } 1655 1656 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { 1657 wpa_printf(MSG_DEBUG, "FT: Target AP address in the " 1658 "RRB Request does not match with own " 1659 "address"); 1660 return -1; 1661 } 1662 1663 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, 1664 sta_addr, pos, end - pos) < 0) 1665 return -1; 1666 } else if (frame->packet_type == FT_PACKET_RESPONSE) { 1667 u16 status_code; 1668 1669 if (end - pos < 2) { 1670 wpa_printf(MSG_DEBUG, "FT: Not enough room for status " 1671 "code in RRB Response"); 1672 return -1; 1673 } 1674 status_code = WPA_GET_LE16(pos); 1675 pos += 2; 1676 1677 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " 1678 "(status_code=%d)", status_code); 1679 1680 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) 1681 return -1; 1682 } else { 1683 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " 1684 "packet_type %d", frame->packet_type); 1685 return -1; 1686 } 1687 1688 return 0; 1689} 1690 1691 1692static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, 1693 struct wpa_ft_pmk_r0_sa *pmk_r0, 1694 struct ft_remote_r1kh *r1kh, 1695 const u8 *s1kh_id, int pairwise) 1696{ 1697 struct ft_r0kh_r1kh_push_frame frame, f; 1698 struct os_time now; 1699 1700 os_memset(&frame, 0, sizeof(frame)); 1701 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; 1702 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; 1703 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); 1704 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); 1705 1706 /* aes_wrap() does not support inplace encryption, so use a temporary 1707 * buffer for the data. */ 1708 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); 1709 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); 1710 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); 1711 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, 1712 s1kh_id, f.pmk_r1, f.pmk_r1_name); 1713 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); 1714 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); 1715 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, 1716 WPA_PMK_NAME_LEN); 1717 os_get_time(&now); 1718 WPA_PUT_LE32(f.timestamp, now.sec); 1719 f.pairwise = host_to_le16(pairwise); 1720 os_memset(f.pad, 0, sizeof(f.pad)); 1721 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, 1722 f.timestamp, frame.timestamp) < 0) 1723 return; 1724 1725 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); 1726} 1727 1728 1729void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) 1730{ 1731 struct wpa_ft_pmk_r0_sa *r0; 1732 struct ft_remote_r1kh *r1kh; 1733 1734 if (!wpa_auth->conf.pmk_r1_push) 1735 return; 1736 1737 r0 = wpa_auth->ft_pmk_cache->pmk_r0; 1738 while (r0) { 1739 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) 1740 break; 1741 r0 = r0->next; 1742 } 1743 1744 if (r0 == NULL || r0->pmk_r1_pushed) 1745 return; 1746 r0->pmk_r1_pushed = 1; 1747 1748 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " 1749 "for STA " MACSTR, MAC2STR(addr)); 1750 1751 r1kh = wpa_auth->conf.r1kh_list; 1752 while (r1kh) { 1753 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise); 1754 r1kh = r1kh->next; 1755 } 1756} 1757 1758#endif /* CONFIG_IEEE80211R */ 1759