1 /* 2 * wpa_supplicant - IBSS RSN 3 * Copyright (c) 2009-2013, 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 "includes.h" 10 11 #include "common.h" 12 #include "common/wpa_ctrl.h" 13 #include "utils/eloop.h" 14 #include "l2_packet/l2_packet.h" 15 #include "rsn_supp/wpa.h" 16 #include "rsn_supp/wpa_ie.h" 17 #include "ap/wpa_auth.h" 18 #include "wpa_supplicant_i.h" 19 #include "driver_i.h" 20 #include "common/ieee802_11_defs.h" 21 #include "ibss_rsn.h" 22 23 24 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx); 25 26 27 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn, 28 const u8 *addr) 29 { 30 struct ibss_rsn_peer *peer; 31 32 for (peer = ibss_rsn->peers; peer; peer = peer->next) 33 if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0) 34 break; 35 return peer; 36 } 37 38 39 static void ibss_rsn_free(struct ibss_rsn_peer *peer) 40 { 41 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL); 42 wpa_auth_sta_deinit(peer->auth); 43 wpa_sm_deinit(peer->supp); 44 os_free(peer); 45 } 46 47 48 static void supp_set_state(void *ctx, enum wpa_states state) 49 { 50 struct ibss_rsn_peer *peer = ctx; 51 peer->supp_state = state; 52 } 53 54 55 static enum wpa_states supp_get_state(void *ctx) 56 { 57 struct ibss_rsn_peer *peer = ctx; 58 return peer->supp_state; 59 } 60 61 62 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf, 63 size_t len) 64 { 65 struct ibss_rsn_peer *peer = ctx; 66 struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s; 67 68 wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x " 69 "len=%lu)", 70 __func__, MAC2STR(dest), proto, (unsigned long) len); 71 72 if (wpa_s->l2) 73 return l2_packet_send(wpa_s->l2, dest, proto, buf, len); 74 75 return wpa_drv_send_eapol(wpa_s, dest, proto, buf, len); 76 } 77 78 79 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data, 80 u16 data_len, size_t *msg_len, void **data_pos) 81 { 82 struct ieee802_1x_hdr *hdr; 83 84 wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)", 85 __func__, type, data_len); 86 87 *msg_len = sizeof(*hdr) + data_len; 88 hdr = os_malloc(*msg_len); 89 if (hdr == NULL) 90 return NULL; 91 92 hdr->version = 2; 93 hdr->type = type; 94 hdr->length = host_to_be16(data_len); 95 96 if (data) 97 os_memcpy(hdr + 1, data, data_len); 98 else 99 os_memset(hdr + 1, 0, data_len); 100 101 if (data_pos) 102 *data_pos = hdr + 1; 103 104 return (u8 *) hdr; 105 } 106 107 108 static int supp_get_beacon_ie(void *ctx) 109 { 110 struct ibss_rsn_peer *peer = ctx; 111 112 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__); 113 /* TODO: get correct RSN IE */ 114 return wpa_sm_set_ap_rsn_ie(peer->supp, 115 (u8 *) "\x30\x14\x01\x00" 116 "\x00\x0f\xac\x04" 117 "\x01\x00\x00\x0f\xac\x04" 118 "\x01\x00\x00\x0f\xac\x02" 119 "\x00\x00", 22); 120 } 121 122 123 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer) 124 { 125 struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s; 126 127 if ((peer->authentication_status & 128 (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) != 129 (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) 130 return; 131 if (peer->authentication_status & IBSS_RSN_REPORTED_PTK) 132 return; 133 peer->authentication_status |= IBSS_RSN_REPORTED_PTK; 134 wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR, 135 MAC2STR(peer->addr)); 136 } 137 138 139 static int supp_set_key(void *ctx, enum wpa_alg alg, 140 const u8 *addr, int key_idx, int set_tx, 141 const u8 *seq, size_t seq_len, 142 const u8 *key, size_t key_len) 143 { 144 struct ibss_rsn_peer *peer = ctx; 145 146 wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d " 147 "set_tx=%d)", 148 __func__, alg, MAC2STR(addr), key_idx, set_tx); 149 wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len); 150 wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len); 151 152 if (key_idx == 0) { 153 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP; 154 ibss_check_rsn_completed(peer); 155 /* 156 * In IBSS RSN, the pairwise key from the 4-way handshake 157 * initiated by the peer with highest MAC address is used. 158 */ 159 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr, 160 ETH_ALEN) > 0) { 161 wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK"); 162 return 0; 163 } 164 } 165 166 if (is_broadcast_ether_addr(addr)) 167 addr = peer->addr; 168 return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx, 169 set_tx, seq, seq_len, key, key_len); 170 } 171 172 173 static void * supp_get_network_ctx(void *ctx) 174 { 175 struct ibss_rsn_peer *peer = ctx; 176 return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s); 177 } 178 179 180 static int supp_mlme_setprotection(void *ctx, const u8 *addr, 181 int protection_type, int key_type) 182 { 183 wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d " 184 "key_type=%d)", 185 __func__, MAC2STR(addr), protection_type, key_type); 186 return 0; 187 } 188 189 190 static void supp_cancel_auth_timeout(void *ctx) 191 { 192 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__); 193 } 194 195 196 static void supp_deauthenticate(void * ctx, int reason_code) 197 { 198 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__); 199 } 200 201 202 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr, 203 const u8 *psk) 204 { 205 struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx)); 206 if (ctx == NULL) 207 return -1; 208 209 ctx->ctx = peer; 210 ctx->msg_ctx = peer->ibss_rsn->wpa_s; 211 ctx->set_state = supp_set_state; 212 ctx->get_state = supp_get_state; 213 ctx->ether_send = supp_ether_send; 214 ctx->get_beacon_ie = supp_get_beacon_ie; 215 ctx->alloc_eapol = supp_alloc_eapol; 216 ctx->set_key = supp_set_key; 217 ctx->get_network_ctx = supp_get_network_ctx; 218 ctx->mlme_setprotection = supp_mlme_setprotection; 219 ctx->cancel_auth_timeout = supp_cancel_auth_timeout; 220 ctx->deauthenticate = supp_deauthenticate; 221 peer->supp = wpa_sm_init(ctx); 222 if (peer->supp == NULL) { 223 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed"); 224 return -1; 225 } 226 227 wpa_sm_set_own_addr(peer->supp, own_addr); 228 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1); 229 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN); 230 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP); 231 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP); 232 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK); 233 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN); 234 235 peer->supp_ie_len = sizeof(peer->supp_ie); 236 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie, 237 &peer->supp_ie_len) < 0) { 238 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()" 239 " failed"); 240 return -1; 241 } 242 243 wpa_sm_notify_assoc(peer->supp, peer->addr); 244 245 return 0; 246 } 247 248 249 static void auth_logger(void *ctx, const u8 *addr, logger_level level, 250 const char *txt) 251 { 252 if (addr) 253 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s", 254 MAC2STR(addr), txt); 255 else 256 wpa_printf(MSG_DEBUG, "AUTH: %s", txt); 257 } 258 259 260 static const u8 * auth_get_psk(void *ctx, const u8 *addr, 261 const u8 *p2p_dev_addr, const u8 *prev_psk) 262 { 263 struct ibss_rsn *ibss_rsn = ctx; 264 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)", 265 __func__, MAC2STR(addr), prev_psk); 266 if (prev_psk) 267 return NULL; 268 return ibss_rsn->psk; 269 } 270 271 272 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data, 273 size_t data_len, int encrypt) 274 { 275 struct ibss_rsn *ibss_rsn = ctx; 276 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s; 277 278 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu " 279 "encrypt=%d)", 280 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt); 281 282 if (wpa_s->l2) 283 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data, 284 data_len); 285 286 return wpa_drv_send_eapol(wpa_s, addr, ETH_P_EAPOL, data, data_len); 287 } 288 289 290 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg, 291 const u8 *addr, int idx, u8 *key, size_t key_len) 292 { 293 struct ibss_rsn *ibss_rsn = ctx; 294 u8 seq[6]; 295 296 os_memset(seq, 0, sizeof(seq)); 297 298 if (addr) { 299 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR 300 " key_idx=%d)", 301 __func__, alg, MAC2STR(addr), idx); 302 } else { 303 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)", 304 __func__, alg, idx); 305 } 306 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len); 307 308 if (idx == 0) { 309 if (addr) { 310 struct ibss_rsn_peer *peer; 311 peer = ibss_rsn_get_peer(ibss_rsn, addr); 312 if (peer) { 313 peer->authentication_status |= 314 IBSS_RSN_SET_PTK_AUTH; 315 ibss_check_rsn_completed(peer); 316 } 317 } 318 /* 319 * In IBSS RSN, the pairwise key from the 4-way handshake 320 * initiated by the peer with highest MAC address is used. 321 */ 322 if (addr == NULL || 323 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) { 324 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK"); 325 return 0; 326 } 327 } 328 329 return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx, 330 1, seq, 6, key, key_len); 331 } 332 333 334 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason) 335 { 336 struct ibss_rsn *ibss_rsn = ctx; 337 wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason); 338 } 339 340 341 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm, 342 void *ctx), 343 void *cb_ctx) 344 { 345 struct ibss_rsn *ibss_rsn = ctx; 346 struct ibss_rsn_peer *peer; 347 348 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta"); 349 350 for (peer = ibss_rsn->peers; peer; peer = peer->next) { 351 if (peer->auth && cb(peer->auth, cb_ctx)) 352 return 1; 353 } 354 355 return 0; 356 } 357 358 359 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn, 360 struct ibss_rsn_peer *peer, int authorized) 361 { 362 int res; 363 364 if (authorized) { 365 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr, 366 WPA_STA_AUTHORIZED, 367 WPA_STA_AUTHORIZED, ~0); 368 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port", 369 MAC2STR(peer->addr)); 370 } else { 371 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr, 372 0, 0, ~WPA_STA_AUTHORIZED); 373 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port", 374 MAC2STR(peer->addr)); 375 } 376 377 if (res && errno != ENOENT) { 378 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags " 379 "for kernel driver (errno=%d)", 380 MAC2STR(peer->addr), errno); 381 } 382 } 383 384 385 static void auth_set_eapol(void *ctx, const u8 *addr, 386 wpa_eapol_variable var, int value) 387 { 388 struct ibss_rsn *ibss_rsn = ctx; 389 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr); 390 391 if (peer == NULL) 392 return; 393 394 switch (var) { 395 case WPA_EAPOL_authorized: 396 ibss_set_sta_authorized(ibss_rsn, peer, value); 397 break; 398 default: 399 /* do not handle any other event */ 400 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var); 401 break; 402 } 403 } 404 405 406 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn, 407 const u8 *own_addr) 408 { 409 struct wpa_auth_config conf; 410 struct wpa_auth_callbacks cb; 411 412 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine"); 413 414 os_memset(&conf, 0, sizeof(conf)); 415 conf.wpa = 2; 416 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK; 417 conf.wpa_pairwise = WPA_CIPHER_CCMP; 418 conf.rsn_pairwise = WPA_CIPHER_CCMP; 419 conf.wpa_group = WPA_CIPHER_CCMP; 420 conf.eapol_version = 2; 421 conf.wpa_group_rekey = 600; 422 423 os_memset(&cb, 0, sizeof(cb)); 424 cb.ctx = ibss_rsn; 425 cb.logger = auth_logger; 426 cb.set_eapol = auth_set_eapol; 427 cb.send_eapol = auth_send_eapol; 428 cb.get_psk = auth_get_psk; 429 cb.set_key = auth_set_key; 430 cb.for_each_sta = auth_for_each_sta; 431 cb.disconnect = ibss_rsn_disconnect; 432 433 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb); 434 if (ibss_rsn->auth_group == NULL) { 435 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed"); 436 return -1; 437 } 438 439 wpa_init_keys(ibss_rsn->auth_group); 440 441 return 0; 442 } 443 444 445 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn, 446 struct ibss_rsn_peer *peer) 447 { 448 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL); 449 if (peer->auth == NULL) { 450 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed"); 451 return -1; 452 } 453 454 /* TODO: get peer RSN IE with Probe Request */ 455 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 456 (u8 *) "\x30\x14\x01\x00" 457 "\x00\x0f\xac\x04" 458 "\x01\x00\x00\x0f\xac\x04" 459 "\x01\x00\x00\x0f\xac\x02" 460 "\x00\x00", 22, NULL, 0) != 461 WPA_IE_OK) { 462 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed"); 463 return -1; 464 } 465 466 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC)) 467 return -1; 468 469 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth)) 470 return -1; 471 472 return 0; 473 } 474 475 476 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq) 477 { 478 struct ieee80211_mgmt auth; 479 const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth); 480 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s; 481 482 if (wpa_s->driver->send_frame == NULL) 483 return -1; 484 485 os_memset(&auth, 0, sizeof(auth)); 486 487 auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 488 WLAN_FC_STYPE_AUTH); 489 os_memcpy(auth.da, da, ETH_ALEN); 490 os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN); 491 os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN); 492 493 auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN); 494 auth.u.auth.auth_transaction = host_to_le16(seq); 495 auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS); 496 497 wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR, 498 seq, MAC2STR(da)); 499 500 return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth, 501 auth_length, 0); 502 } 503 504 505 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer) 506 { 507 return peer->authentication_status & 508 (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US); 509 } 510 511 512 static struct ibss_rsn_peer * 513 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr) 514 { 515 struct ibss_rsn_peer *peer; 516 if (ibss_rsn == NULL) 517 return NULL; 518 519 peer = ibss_rsn_get_peer(ibss_rsn, addr); 520 if (peer) { 521 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR 522 " already running", MAC2STR(addr)); 523 return peer; 524 } 525 526 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR, 527 MAC2STR(addr)); 528 529 peer = os_zalloc(sizeof(*peer)); 530 if (peer == NULL) { 531 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory."); 532 return NULL; 533 } 534 535 peer->ibss_rsn = ibss_rsn; 536 os_memcpy(peer->addr, addr, ETH_ALEN); 537 peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED; 538 539 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr, 540 ibss_rsn->psk) < 0) { 541 ibss_rsn_free(peer); 542 return NULL; 543 } 544 545 peer->next = ibss_rsn->peers; 546 ibss_rsn->peers = peer; 547 548 return peer; 549 } 550 551 552 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx) 553 { 554 struct ibss_rsn_peer *peer = eloop_ctx; 555 556 /* 557 * Assume peer does not support Authentication exchange or the frame was 558 * lost somewhere - start EAPOL Authenticator. 559 */ 560 wpa_printf(MSG_DEBUG, 561 "RSN: Timeout on waiting Authentication frame response from " 562 MACSTR " - start authenticator", MAC2STR(peer->addr)); 563 564 peer->authentication_status |= IBSS_RSN_AUTH_BY_US; 565 ibss_rsn_auth_init(peer->ibss_rsn, peer); 566 } 567 568 569 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr) 570 { 571 struct ibss_rsn_peer *peer; 572 int res; 573 574 /* if the peer already exists, exit immediately */ 575 peer = ibss_rsn_get_peer(ibss_rsn, addr); 576 if (peer) 577 return 0; 578 579 peer = ibss_rsn_peer_init(ibss_rsn, addr); 580 if (peer == NULL) 581 return -1; 582 583 /* Open Authentication: send first Authentication frame */ 584 res = ibss_rsn_send_auth(ibss_rsn, addr, 1); 585 if (res) { 586 /* 587 * The driver may not support Authentication frame exchange in 588 * IBSS. Ignore authentication and go through EAPOL exchange. 589 */ 590 peer->authentication_status |= IBSS_RSN_AUTH_BY_US; 591 return ibss_rsn_auth_init(ibss_rsn, peer); 592 } else { 593 os_get_time(&peer->own_auth_tx); 594 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL); 595 } 596 597 return 0; 598 } 599 600 601 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn, 602 struct ibss_rsn_peer *peer, int reason) 603 { 604 int already_started; 605 606 if (ibss_rsn == NULL || peer == NULL) 607 return -1; 608 609 already_started = ibss_rsn_is_auth_started(peer); 610 peer->authentication_status |= reason; 611 612 if (already_started) { 613 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already " 614 "started for peer " MACSTR, MAC2STR(peer->addr)); 615 return 0; 616 } 617 618 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator " 619 "for now-authenticated peer " MACSTR, MAC2STR(peer->addr)); 620 621 return ibss_rsn_auth_init(ibss_rsn, peer); 622 } 623 624 625 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac) 626 { 627 struct ibss_rsn_peer *peer, *prev; 628 629 if (ibss_rsn == NULL) 630 return; 631 632 if (peermac == NULL) { 633 /* remove all peers */ 634 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__); 635 peer = ibss_rsn->peers; 636 while (peer) { 637 prev = peer; 638 peer = peer->next; 639 ibss_rsn_free(prev); 640 ibss_rsn->peers = peer; 641 } 642 } else { 643 /* remove specific peer */ 644 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR, 645 __func__, MAC2STR(peermac)); 646 647 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL; 648 prev = peer, peer = peer->next) { 649 if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) { 650 if (prev == NULL) 651 ibss_rsn->peers = peer->next; 652 else 653 prev->next = peer->next; 654 ibss_rsn_free(peer); 655 wpa_printf(MSG_DEBUG, "%s: Successfully " 656 "removed a specific peer", 657 __func__); 658 break; 659 } 660 } 661 } 662 } 663 664 665 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s) 666 { 667 struct ibss_rsn *ibss_rsn; 668 669 ibss_rsn = os_zalloc(sizeof(*ibss_rsn)); 670 if (ibss_rsn == NULL) 671 return NULL; 672 ibss_rsn->wpa_s = wpa_s; 673 674 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) { 675 ibss_rsn_deinit(ibss_rsn); 676 return NULL; 677 } 678 679 return ibss_rsn; 680 } 681 682 683 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn) 684 { 685 struct ibss_rsn_peer *peer, *prev; 686 687 if (ibss_rsn == NULL) 688 return; 689 690 peer = ibss_rsn->peers; 691 while (peer) { 692 prev = peer; 693 peer = peer->next; 694 ibss_rsn_free(prev); 695 } 696 697 wpa_deinit(ibss_rsn->auth_group); 698 os_free(ibss_rsn); 699 700 } 701 702 703 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len) 704 { 705 const struct ieee802_1x_hdr *hdr; 706 const struct wpa_eapol_key *key; 707 u16 key_info; 708 size_t plen; 709 710 /* TODO: Support other EAPOL packets than just EAPOL-Key */ 711 712 if (len < sizeof(*hdr) + sizeof(*key)) 713 return -1; 714 715 hdr = (const struct ieee802_1x_hdr *) buf; 716 key = (const struct wpa_eapol_key *) (hdr + 1); 717 plen = be_to_host16(hdr->length); 718 719 if (hdr->version < EAPOL_VERSION) { 720 /* TODO: backwards compatibility */ 721 } 722 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { 723 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, " 724 "not a Key frame", hdr->type); 725 return -1; 726 } 727 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) { 728 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu " 729 "invalid (frame size %lu)", 730 (unsigned long) plen, (unsigned long) len); 731 return -1; 732 } 733 734 if (key->type != EAPOL_KEY_TYPE_RSN) { 735 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, " 736 "discarded", key->type); 737 return -1; 738 } 739 740 key_info = WPA_GET_BE16(key->key_info); 741 742 return !!(key_info & WPA_KEY_INFO_ACK); 743 } 744 745 746 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn, 747 struct ibss_rsn_peer *peer, 748 const u8 *buf, size_t len) 749 { 750 int supp; 751 u8 *tmp; 752 753 supp = ibss_rsn_eapol_dst_supp(buf, len); 754 if (supp < 0) 755 return -1; 756 757 tmp = os_malloc(len); 758 if (tmp == NULL) 759 return -1; 760 os_memcpy(tmp, buf, len); 761 if (supp) { 762 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER; 763 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from " 764 MACSTR, MAC2STR(peer->addr)); 765 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len); 766 } else { 767 if (ibss_rsn_is_auth_started(peer) == 0) { 768 wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for " 769 "Authenticator dropped as " MACSTR " is not " 770 "authenticated", MAC2STR(peer->addr)); 771 os_free(tmp); 772 return -1; 773 } 774 775 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator " 776 "from "MACSTR, MAC2STR(peer->addr)); 777 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len); 778 } 779 os_free(tmp); 780 781 return 1; 782 } 783 784 785 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr, 786 const u8 *buf, size_t len) 787 { 788 struct ibss_rsn_peer *peer; 789 790 if (ibss_rsn == NULL) 791 return -1; 792 793 peer = ibss_rsn_get_peer(ibss_rsn, src_addr); 794 if (peer) 795 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len); 796 797 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) { 798 /* 799 * Create new IBSS peer based on an EAPOL message from the peer 800 * Authenticator. 801 */ 802 peer = ibss_rsn_peer_init(ibss_rsn, src_addr); 803 if (peer == NULL) 804 return -1; 805 806 /* assume the peer is authenticated already */ 807 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer " 808 MACSTR, MAC2STR(src_addr)); 809 ibss_rsn_peer_authenticated(ibss_rsn, peer, 810 IBSS_RSN_AUTH_EAPOL_BY_US); 811 812 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers, 813 buf, len); 814 } 815 816 return 0; 817 } 818 819 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk) 820 { 821 if (ibss_rsn == NULL) 822 return; 823 os_memcpy(ibss_rsn->psk, psk, PMK_LEN); 824 } 825 826 827 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn, 828 struct ibss_rsn_peer *peer, 829 const u8* addr) 830 { 831 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR, 832 MAC2STR(addr)); 833 834 if (peer && 835 peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) { 836 if (peer->own_auth_tx.sec) { 837 struct os_time now, diff; 838 os_get_time(&now); 839 os_time_sub(&now, &peer->own_auth_tx, &diff); 840 if (diff.sec == 0 && diff.usec < 500000) { 841 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX", 842 (int) diff.usec); 843 goto skip_reinit; 844 } 845 } 846 /* 847 * A peer sent us an Authentication frame even though it already 848 * started an EAPOL session. We should reinit state machines 849 * here, but it's much more complicated than just deleting and 850 * recreating the state machine 851 */ 852 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station " 853 MACSTR, MAC2STR(addr)); 854 855 ibss_rsn_stop(ibss_rsn, addr); 856 peer = NULL; 857 } 858 859 if (!peer) { 860 peer = ibss_rsn_peer_init(ibss_rsn, addr); 861 if (!peer) 862 return; 863 864 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR, 865 MAC2STR(addr)); 866 } 867 868 skip_reinit: 869 /* reply with an Authentication frame now, before sending an EAPOL */ 870 ibss_rsn_send_auth(ibss_rsn, addr, 2); 871 /* no need to start another AUTH challenge in the other way.. */ 872 ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US); 873 } 874 875 876 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame, 877 size_t len) 878 { 879 const struct ieee80211_mgmt *header; 880 struct ibss_rsn_peer *peer; 881 size_t auth_length; 882 883 header = (const struct ieee80211_mgmt *) auth_frame; 884 auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth); 885 886 if (ibss_rsn == NULL || len < auth_length) 887 return; 888 889 if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN || 890 le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS) 891 return; 892 893 peer = ibss_rsn_get_peer(ibss_rsn, header->sa); 894 895 switch (le_to_host16(header->u.auth.auth_transaction)) { 896 case 1: 897 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa); 898 break; 899 case 2: 900 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from " 901 MACSTR, MAC2STR(header->sa)); 902 if (!peer) { 903 wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from " 904 "unknown STA " MACSTR, MAC2STR(header->sa)); 905 break; 906 } 907 908 /* authentication has been completed */ 909 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL); 910 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR, 911 MAC2STR(header->sa)); 912 ibss_rsn_peer_authenticated(ibss_rsn, peer, 913 IBSS_RSN_AUTH_BY_US); 914 break; 915 } 916 } 917
