1 /* 2 * wpa_supplicant - IBSS RSN 3 * Copyright (c) 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 "includes.h" 10 11 #include "common.h" 12 #include "l2_packet/l2_packet.h" 13 #include "rsn_supp/wpa.h" 14 #include "rsn_supp/wpa_ie.h" 15 #include "ap/wpa_auth.h" 16 #include "wpa_supplicant_i.h" 17 #include "driver_i.h" 18 #include "ibss_rsn.h" 19 20 21 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn, 22 const u8 *addr) 23 { 24 struct ibss_rsn_peer *peer; 25 26 for (peer = ibss_rsn->peers; peer; peer = peer->next) 27 if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0) 28 break; 29 return peer; 30 } 31 32 33 static void ibss_rsn_free(struct ibss_rsn_peer *peer) 34 { 35 wpa_auth_sta_deinit(peer->auth); 36 wpa_sm_deinit(peer->supp); 37 os_free(peer); 38 } 39 40 41 static void supp_set_state(void *ctx, enum wpa_states state) 42 { 43 struct ibss_rsn_peer *peer = ctx; 44 peer->supp_state = state; 45 } 46 47 48 static enum wpa_states supp_get_state(void *ctx) 49 { 50 struct ibss_rsn_peer *peer = ctx; 51 return peer->supp_state; 52 } 53 54 55 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf, 56 size_t len) 57 { 58 struct ibss_rsn_peer *peer = ctx; 59 struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s; 60 61 wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x " 62 "len=%lu)", 63 __func__, MAC2STR(dest), proto, (unsigned long) len); 64 65 if (wpa_s->l2) 66 return l2_packet_send(wpa_s->l2, dest, proto, buf, len); 67 68 return wpa_drv_send_eapol(wpa_s, dest, proto, buf, len); 69 } 70 71 72 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data, 73 u16 data_len, size_t *msg_len, void **data_pos) 74 { 75 struct ieee802_1x_hdr *hdr; 76 77 wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)", 78 __func__, type, data_len); 79 80 *msg_len = sizeof(*hdr) + data_len; 81 hdr = os_malloc(*msg_len); 82 if (hdr == NULL) 83 return NULL; 84 85 hdr->version = 2; 86 hdr->type = type; 87 hdr->length = host_to_be16(data_len); 88 89 if (data) 90 os_memcpy(hdr + 1, data, data_len); 91 else 92 os_memset(hdr + 1, 0, data_len); 93 94 if (data_pos) 95 *data_pos = hdr + 1; 96 97 return (u8 *) hdr; 98 } 99 100 101 static int supp_get_beacon_ie(void *ctx) 102 { 103 struct ibss_rsn_peer *peer = ctx; 104 105 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__); 106 /* TODO: get correct RSN IE */ 107 return wpa_sm_set_ap_rsn_ie(peer->supp, 108 (u8 *) "\x30\x14\x01\x00" 109 "\x00\x0f\xac\x04" 110 "\x01\x00\x00\x0f\xac\x04" 111 "\x01\x00\x00\x0f\xac\x02" 112 "\x00\x00", 22); 113 } 114 115 116 static int supp_set_key(void *ctx, enum wpa_alg alg, 117 const u8 *addr, int key_idx, int set_tx, 118 const u8 *seq, size_t seq_len, 119 const u8 *key, size_t key_len) 120 { 121 struct ibss_rsn_peer *peer = ctx; 122 123 wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d " 124 "set_tx=%d)", 125 __func__, alg, MAC2STR(addr), key_idx, set_tx); 126 wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len); 127 wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len); 128 129 if (key_idx == 0) { 130 /* 131 * In IBSS RSN, the pairwise key from the 4-way handshake 132 * initiated by the peer with highest MAC address is used. 133 */ 134 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr, 135 ETH_ALEN) > 0) { 136 wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK"); 137 return 0; 138 } 139 } 140 141 if (is_broadcast_ether_addr(addr)) 142 addr = peer->addr; 143 return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx, 144 set_tx, seq, seq_len, key, key_len); 145 } 146 147 148 static void * supp_get_network_ctx(void *ctx) 149 { 150 struct ibss_rsn_peer *peer = ctx; 151 return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s); 152 } 153 154 155 static int supp_mlme_setprotection(void *ctx, const u8 *addr, 156 int protection_type, int key_type) 157 { 158 wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d " 159 "key_type=%d)", 160 __func__, MAC2STR(addr), protection_type, key_type); 161 return 0; 162 } 163 164 165 static void supp_cancel_auth_timeout(void *ctx) 166 { 167 wpa_printf(MSG_DEBUG, "SUPP: %s", __func__); 168 } 169 170 171 static void supp_deauthenticate(void * ctx, int reason_code) 172 { 173 wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__); 174 } 175 176 177 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr, 178 const u8 *psk) 179 { 180 struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx)); 181 if (ctx == NULL) 182 return -1; 183 184 ctx->ctx = peer; 185 ctx->msg_ctx = peer->ibss_rsn->wpa_s; 186 ctx->set_state = supp_set_state; 187 ctx->get_state = supp_get_state; 188 ctx->ether_send = supp_ether_send; 189 ctx->get_beacon_ie = supp_get_beacon_ie; 190 ctx->alloc_eapol = supp_alloc_eapol; 191 ctx->set_key = supp_set_key; 192 ctx->get_network_ctx = supp_get_network_ctx; 193 ctx->mlme_setprotection = supp_mlme_setprotection; 194 ctx->cancel_auth_timeout = supp_cancel_auth_timeout; 195 ctx->deauthenticate = supp_deauthenticate; 196 peer->supp = wpa_sm_init(ctx); 197 if (peer->supp == NULL) { 198 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed"); 199 return -1; 200 } 201 202 wpa_sm_set_own_addr(peer->supp, own_addr); 203 wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1); 204 wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN); 205 wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP); 206 wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP); 207 wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK); 208 wpa_sm_set_pmk(peer->supp, psk, PMK_LEN); 209 210 peer->supp_ie_len = sizeof(peer->supp_ie); 211 if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie, 212 &peer->supp_ie_len) < 0) { 213 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()" 214 " failed"); 215 return -1; 216 } 217 218 wpa_sm_notify_assoc(peer->supp, peer->addr); 219 220 return 0; 221 } 222 223 224 static void auth_logger(void *ctx, const u8 *addr, logger_level level, 225 const char *txt) 226 { 227 if (addr) 228 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s", 229 MAC2STR(addr), txt); 230 else 231 wpa_printf(MSG_DEBUG, "AUTH: %s", txt); 232 } 233 234 235 static const u8 * auth_get_psk(void *ctx, const u8 *addr, const u8 *prev_psk) 236 { 237 struct ibss_rsn *ibss_rsn = ctx; 238 wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)", 239 __func__, MAC2STR(addr), prev_psk); 240 if (prev_psk) 241 return NULL; 242 return ibss_rsn->psk; 243 } 244 245 246 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data, 247 size_t data_len, int encrypt) 248 { 249 struct ibss_rsn *ibss_rsn = ctx; 250 struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s; 251 252 wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu " 253 "encrypt=%d)", 254 __func__, MAC2STR(addr), (unsigned long) data_len, encrypt); 255 256 if (wpa_s->l2) 257 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data, 258 data_len); 259 260 return wpa_drv_send_eapol(wpa_s, addr, ETH_P_EAPOL, data, data_len); 261 } 262 263 264 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg, 265 const u8 *addr, int idx, u8 *key, size_t key_len) 266 { 267 struct ibss_rsn *ibss_rsn = ctx; 268 u8 seq[6]; 269 270 os_memset(seq, 0, sizeof(seq)); 271 272 if (addr) { 273 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR 274 " key_idx=%d)", 275 __func__, alg, MAC2STR(addr), idx); 276 } else { 277 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)", 278 __func__, alg, idx); 279 } 280 wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len); 281 282 if (idx == 0) { 283 /* 284 * In IBSS RSN, the pairwise key from the 4-way handshake 285 * initiated by the peer with highest MAC address is used. 286 */ 287 if (addr == NULL || 288 os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) { 289 wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK"); 290 return 0; 291 } 292 } 293 294 return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx, 295 1, seq, 6, key, key_len); 296 } 297 298 299 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm, 300 void *ctx), 301 void *cb_ctx) 302 { 303 struct ibss_rsn *ibss_rsn = ctx; 304 struct ibss_rsn_peer *peer; 305 306 wpa_printf(MSG_DEBUG, "AUTH: for_each_sta"); 307 308 for (peer = ibss_rsn->peers; peer; peer = peer->next) { 309 if (peer->auth && cb(peer->auth, cb_ctx)) 310 return 1; 311 } 312 313 return 0; 314 } 315 316 317 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn, 318 struct ibss_rsn_peer *peer, int authorized) 319 { 320 int res; 321 322 if (authorized) { 323 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr, 324 WPA_STA_AUTHORIZED, 325 WPA_STA_AUTHORIZED, ~0); 326 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port", 327 MAC2STR(peer->addr)); 328 } else { 329 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr, 330 0, 0, ~WPA_STA_AUTHORIZED); 331 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port", 332 MAC2STR(peer->addr)); 333 } 334 335 if (res && errno != ENOENT) { 336 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags " 337 "for kernel driver (errno=%d)", 338 MAC2STR(peer->addr), errno); 339 } 340 } 341 342 343 static void auth_set_eapol(void *ctx, const u8 *addr, 344 wpa_eapol_variable var, int value) 345 { 346 struct ibss_rsn *ibss_rsn = ctx; 347 struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr); 348 349 if (peer == NULL) 350 return; 351 352 switch (var) { 353 case WPA_EAPOL_authorized: 354 ibss_set_sta_authorized(ibss_rsn, peer, value); 355 break; 356 default: 357 /* do not handle any other event */ 358 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var); 359 break; 360 } 361 } 362 363 364 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn, 365 const u8 *own_addr) 366 { 367 struct wpa_auth_config conf; 368 struct wpa_auth_callbacks cb; 369 370 wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine"); 371 372 os_memset(&conf, 0, sizeof(conf)); 373 conf.wpa = 2; 374 conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK; 375 conf.wpa_pairwise = WPA_CIPHER_CCMP; 376 conf.rsn_pairwise = WPA_CIPHER_CCMP; 377 conf.wpa_group = WPA_CIPHER_CCMP; 378 conf.eapol_version = 2; 379 conf.wpa_group_rekey = 600; 380 381 os_memset(&cb, 0, sizeof(cb)); 382 cb.ctx = ibss_rsn; 383 cb.logger = auth_logger; 384 cb.set_eapol = auth_set_eapol; 385 cb.send_eapol = auth_send_eapol; 386 cb.get_psk = auth_get_psk; 387 cb.set_key = auth_set_key; 388 cb.for_each_sta = auth_for_each_sta; 389 390 ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb); 391 if (ibss_rsn->auth_group == NULL) { 392 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed"); 393 return -1; 394 } 395 396 wpa_init_keys(ibss_rsn->auth_group); 397 398 return 0; 399 } 400 401 402 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn, 403 struct ibss_rsn_peer *peer) 404 { 405 peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr); 406 if (peer->auth == NULL) { 407 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed"); 408 return -1; 409 } 410 411 /* TODO: get peer RSN IE with Probe Request */ 412 if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 413 (u8 *) "\x30\x14\x01\x00" 414 "\x00\x0f\xac\x04" 415 "\x01\x00\x00\x0f\xac\x04" 416 "\x01\x00\x00\x0f\xac\x02" 417 "\x00\x00", 22, NULL, 0) != 418 WPA_IE_OK) { 419 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed"); 420 return -1; 421 } 422 423 if (wpa_auth_sm_event(peer->auth, WPA_ASSOC)) 424 return -1; 425 426 if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth)) 427 return -1; 428 429 return 0; 430 } 431 432 433 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr) 434 { 435 struct ibss_rsn_peer *peer; 436 437 if (ibss_rsn == NULL) 438 return -1; 439 440 if (ibss_rsn_get_peer(ibss_rsn, addr)) { 441 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator and Supplicant " 442 "for peer " MACSTR " already running", 443 MAC2STR(addr)); 444 return 0; 445 } 446 447 wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator and " 448 "Supplicant for peer " MACSTR, MAC2STR(addr)); 449 450 peer = os_zalloc(sizeof(*peer)); 451 if (peer == NULL) 452 return -1; 453 454 peer->ibss_rsn = ibss_rsn; 455 os_memcpy(peer->addr, addr, ETH_ALEN); 456 457 if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr, ibss_rsn->psk) 458 < 0) { 459 ibss_rsn_free(peer); 460 return -1; 461 } 462 463 if (ibss_rsn_auth_init(ibss_rsn, peer) < 0) { 464 ibss_rsn_free(peer); 465 return -1; 466 } 467 468 peer->next = ibss_rsn->peers; 469 ibss_rsn->peers = peer; 470 471 return 0; 472 } 473 474 475 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac) 476 { 477 struct ibss_rsn_peer *peer, *prev; 478 479 if (ibss_rsn == NULL) 480 return; 481 482 if (peermac == NULL) { 483 /* remove all peers */ 484 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__); 485 peer = ibss_rsn->peers; 486 while (peer) { 487 prev = peer; 488 peer = peer->next; 489 ibss_rsn_free(prev); 490 ibss_rsn->peers = peer; 491 } 492 } else { 493 /* remove specific peer */ 494 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR, 495 __func__, MAC2STR(peermac)); 496 497 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL; 498 prev = peer, peer = peer->next) { 499 if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) { 500 if (prev == NULL) 501 ibss_rsn->peers = peer->next; 502 else 503 prev->next = peer->next; 504 ibss_rsn_free(peer); 505 wpa_printf(MSG_DEBUG, "%s: Successfully " 506 "removed a specific peer", 507 __func__); 508 break; 509 } 510 } 511 } 512 } 513 514 515 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s) 516 { 517 struct ibss_rsn *ibss_rsn; 518 519 ibss_rsn = os_zalloc(sizeof(*ibss_rsn)); 520 if (ibss_rsn == NULL) 521 return NULL; 522 ibss_rsn->wpa_s = wpa_s; 523 524 if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) { 525 ibss_rsn_deinit(ibss_rsn); 526 return NULL; 527 } 528 529 return ibss_rsn; 530 } 531 532 533 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn) 534 { 535 struct ibss_rsn_peer *peer, *prev; 536 537 if (ibss_rsn == NULL) 538 return; 539 540 peer = ibss_rsn->peers; 541 while (peer) { 542 prev = peer; 543 peer = peer->next; 544 ibss_rsn_free(prev); 545 } 546 547 wpa_deinit(ibss_rsn->auth_group); 548 os_free(ibss_rsn); 549 550 } 551 552 553 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len) 554 { 555 const struct ieee802_1x_hdr *hdr; 556 const struct wpa_eapol_key *key; 557 u16 key_info; 558 size_t plen; 559 560 /* TODO: Support other EAPOL packets than just EAPOL-Key */ 561 562 if (len < sizeof(*hdr) + sizeof(*key)) 563 return -1; 564 565 hdr = (const struct ieee802_1x_hdr *) buf; 566 key = (const struct wpa_eapol_key *) (hdr + 1); 567 plen = be_to_host16(hdr->length); 568 569 if (hdr->version < EAPOL_VERSION) { 570 /* TODO: backwards compatibility */ 571 } 572 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { 573 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, " 574 "not a Key frame", hdr->type); 575 return -1; 576 } 577 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) { 578 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu " 579 "invalid (frame size %lu)", 580 (unsigned long) plen, (unsigned long) len); 581 return -1; 582 } 583 584 if (key->type != EAPOL_KEY_TYPE_RSN) { 585 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, " 586 "discarded", key->type); 587 return -1; 588 } 589 590 key_info = WPA_GET_BE16(key->key_info); 591 592 return !!(key_info & WPA_KEY_INFO_ACK); 593 } 594 595 596 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn, 597 struct ibss_rsn_peer *peer, 598 const u8 *buf, size_t len) 599 { 600 int supp; 601 u8 *tmp; 602 603 supp = ibss_rsn_eapol_dst_supp(buf, len); 604 if (supp < 0) 605 return -1; 606 607 tmp = os_malloc(len); 608 if (tmp == NULL) 609 return -1; 610 os_memcpy(tmp, buf, len); 611 if (supp) { 612 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant"); 613 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len); 614 } else { 615 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator"); 616 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len); 617 } 618 os_free(tmp); 619 620 return 1; 621 } 622 623 624 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr, 625 const u8 *buf, size_t len) 626 { 627 struct ibss_rsn_peer *peer; 628 629 if (ibss_rsn == NULL) 630 return -1; 631 632 peer = ibss_rsn_get_peer(ibss_rsn, src_addr); 633 if (peer) 634 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len); 635 636 if (ibss_rsn_eapol_dst_supp(buf, len) > 0) { 637 /* 638 * Create new IBSS peer based on an EAPOL message from the peer 639 * Authenticator. 640 */ 641 if (ibss_rsn_start(ibss_rsn, src_addr) < 0) 642 return -1; 643 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers, 644 buf, len); 645 } 646 647 return 0; 648 } 649 650 651 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk) 652 { 653 if (ibss_rsn == NULL) 654 return; 655 os_memcpy(ibss_rsn->psk, psk, PMK_LEN); 656 } 657
