1 /* 2 * hostapd / WPA authenticator glue code 3 * Copyright (c) 2002-2012, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "common/ieee802_11_defs.h" 13 #include "common/sae.h" 14 #include "eapol_auth/eapol_auth_sm.h" 15 #include "eapol_auth/eapol_auth_sm_i.h" 16 #include "eap_server/eap.h" 17 #include "l2_packet/l2_packet.h" 18 #include "drivers/driver.h" 19 #include "hostapd.h" 20 #include "ieee802_1x.h" 21 #include "preauth_auth.h" 22 #include "sta_info.h" 23 #include "tkip_countermeasures.h" 24 #include "ap_drv_ops.h" 25 #include "ap_config.h" 26 #include "wpa_auth.h" 27 #include "wpa_auth_glue.h" 28 29 30 static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf, 31 struct hostapd_config *iconf, 32 struct wpa_auth_config *wconf) 33 { 34 os_memset(wconf, 0, sizeof(*wconf)); 35 wconf->wpa = conf->wpa; 36 wconf->wpa_key_mgmt = conf->wpa_key_mgmt; 37 wconf->wpa_pairwise = conf->wpa_pairwise; 38 wconf->wpa_group = conf->wpa_group; 39 wconf->wpa_group_rekey = conf->wpa_group_rekey; 40 wconf->wpa_strict_rekey = conf->wpa_strict_rekey; 41 wconf->wpa_gmk_rekey = conf->wpa_gmk_rekey; 42 wconf->wpa_ptk_rekey = conf->wpa_ptk_rekey; 43 wconf->rsn_pairwise = conf->rsn_pairwise; 44 wconf->rsn_preauth = conf->rsn_preauth; 45 wconf->eapol_version = conf->eapol_version; 46 wconf->peerkey = conf->peerkey; 47 wconf->wmm_enabled = conf->wmm_enabled; 48 wconf->wmm_uapsd = conf->wmm_uapsd; 49 wconf->disable_pmksa_caching = conf->disable_pmksa_caching; 50 wconf->okc = conf->okc; 51 #ifdef CONFIG_IEEE80211W 52 wconf->ieee80211w = conf->ieee80211w; 53 #endif /* CONFIG_IEEE80211W */ 54 #ifdef CONFIG_IEEE80211R 55 wconf->ssid_len = conf->ssid.ssid_len; 56 if (wconf->ssid_len > SSID_LEN) 57 wconf->ssid_len = SSID_LEN; 58 os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len); 59 os_memcpy(wconf->mobility_domain, conf->mobility_domain, 60 MOBILITY_DOMAIN_ID_LEN); 61 if (conf->nas_identifier && 62 os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) { 63 wconf->r0_key_holder_len = os_strlen(conf->nas_identifier); 64 os_memcpy(wconf->r0_key_holder, conf->nas_identifier, 65 wconf->r0_key_holder_len); 66 } 67 os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN); 68 wconf->r0_key_lifetime = conf->r0_key_lifetime; 69 wconf->reassociation_deadline = conf->reassociation_deadline; 70 wconf->r0kh_list = conf->r0kh_list; 71 wconf->r1kh_list = conf->r1kh_list; 72 wconf->pmk_r1_push = conf->pmk_r1_push; 73 wconf->ft_over_ds = conf->ft_over_ds; 74 #endif /* CONFIG_IEEE80211R */ 75 #ifdef CONFIG_HS20 76 wconf->disable_gtk = conf->disable_dgaf; 77 #endif /* CONFIG_HS20 */ 78 #ifdef CONFIG_TESTING_OPTIONS 79 wconf->corrupt_gtk_rekey_mic_probability = 80 iconf->corrupt_gtk_rekey_mic_probability; 81 #endif /* CONFIG_TESTING_OPTIONS */ 82 } 83 84 85 static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr, 86 logger_level level, const char *txt) 87 { 88 #ifndef CONFIG_NO_HOSTAPD_LOGGER 89 struct hostapd_data *hapd = ctx; 90 int hlevel; 91 92 switch (level) { 93 case LOGGER_WARNING: 94 hlevel = HOSTAPD_LEVEL_WARNING; 95 break; 96 case LOGGER_INFO: 97 hlevel = HOSTAPD_LEVEL_INFO; 98 break; 99 case LOGGER_DEBUG: 100 default: 101 hlevel = HOSTAPD_LEVEL_DEBUG; 102 break; 103 } 104 105 hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt); 106 #endif /* CONFIG_NO_HOSTAPD_LOGGER */ 107 } 108 109 110 static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr, 111 u16 reason) 112 { 113 struct hostapd_data *hapd = ctx; 114 wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: " 115 "STA " MACSTR " reason %d", 116 __func__, MAC2STR(addr), reason); 117 ap_sta_disconnect(hapd, NULL, addr, reason); 118 } 119 120 121 static int hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr) 122 { 123 struct hostapd_data *hapd = ctx; 124 return michael_mic_failure(hapd, addr, 0); 125 } 126 127 128 static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr, 129 wpa_eapol_variable var, int value) 130 { 131 struct hostapd_data *hapd = ctx; 132 struct sta_info *sta = ap_get_sta(hapd, addr); 133 if (sta == NULL) 134 return; 135 switch (var) { 136 case WPA_EAPOL_portEnabled: 137 ieee802_1x_notify_port_enabled(sta->eapol_sm, value); 138 break; 139 case WPA_EAPOL_portValid: 140 ieee802_1x_notify_port_valid(sta->eapol_sm, value); 141 break; 142 case WPA_EAPOL_authorized: 143 ieee802_1x_set_sta_authorized(hapd, sta, value); 144 break; 145 case WPA_EAPOL_portControl_Auto: 146 if (sta->eapol_sm) 147 sta->eapol_sm->portControl = Auto; 148 break; 149 case WPA_EAPOL_keyRun: 150 if (sta->eapol_sm) 151 sta->eapol_sm->keyRun = value ? TRUE : FALSE; 152 break; 153 case WPA_EAPOL_keyAvailable: 154 if (sta->eapol_sm) 155 sta->eapol_sm->eap_if->eapKeyAvailable = 156 value ? TRUE : FALSE; 157 break; 158 case WPA_EAPOL_keyDone: 159 if (sta->eapol_sm) 160 sta->eapol_sm->keyDone = value ? TRUE : FALSE; 161 break; 162 case WPA_EAPOL_inc_EapolFramesTx: 163 if (sta->eapol_sm) 164 sta->eapol_sm->dot1xAuthEapolFramesTx++; 165 break; 166 } 167 } 168 169 170 static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr, 171 wpa_eapol_variable var) 172 { 173 struct hostapd_data *hapd = ctx; 174 struct sta_info *sta = ap_get_sta(hapd, addr); 175 if (sta == NULL || sta->eapol_sm == NULL) 176 return -1; 177 switch (var) { 178 case WPA_EAPOL_keyRun: 179 return sta->eapol_sm->keyRun; 180 case WPA_EAPOL_keyAvailable: 181 return sta->eapol_sm->eap_if->eapKeyAvailable; 182 default: 183 return -1; 184 } 185 } 186 187 188 static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr, 189 const u8 *p2p_dev_addr, 190 const u8 *prev_psk) 191 { 192 struct hostapd_data *hapd = ctx; 193 struct sta_info *sta = ap_get_sta(hapd, addr); 194 const u8 *psk; 195 196 #ifdef CONFIG_SAE 197 if (sta && sta->auth_alg == WLAN_AUTH_SAE) { 198 if (!sta->sae || prev_psk) 199 return NULL; 200 return sta->sae->pmk; 201 } 202 #endif /* CONFIG_SAE */ 203 204 psk = hostapd_get_psk(hapd->conf, addr, p2p_dev_addr, prev_psk); 205 /* 206 * This is about to iterate over all psks, prev_psk gives the last 207 * returned psk which should not be returned again. 208 * logic list (all hostapd_get_psk; all sta->psk) 209 */ 210 if (sta && sta->psk && !psk) { 211 struct hostapd_sta_wpa_psk_short *pos; 212 psk = sta->psk->psk; 213 for (pos = sta->psk; pos; pos = pos->next) { 214 if (pos->psk == prev_psk) { 215 psk = pos->next ? pos->next->psk : NULL; 216 break; 217 } 218 } 219 } 220 return psk; 221 } 222 223 224 static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk, 225 size_t *len) 226 { 227 struct hostapd_data *hapd = ctx; 228 const u8 *key; 229 size_t keylen; 230 struct sta_info *sta; 231 232 sta = ap_get_sta(hapd, addr); 233 if (sta == NULL) 234 return -1; 235 236 key = ieee802_1x_get_key(sta->eapol_sm, &keylen); 237 if (key == NULL) 238 return -1; 239 240 if (keylen > *len) 241 keylen = *len; 242 os_memcpy(msk, key, keylen); 243 *len = keylen; 244 245 return 0; 246 } 247 248 249 static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg, 250 const u8 *addr, int idx, u8 *key, 251 size_t key_len) 252 { 253 struct hostapd_data *hapd = ctx; 254 const char *ifname = hapd->conf->iface; 255 256 if (vlan_id > 0) { 257 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id); 258 if (ifname == NULL) 259 return -1; 260 } 261 262 return hostapd_drv_set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0, 263 key, key_len); 264 } 265 266 267 static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx, 268 u8 *seq) 269 { 270 struct hostapd_data *hapd = ctx; 271 return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq); 272 } 273 274 275 static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr, 276 const u8 *data, size_t data_len, 277 int encrypt) 278 { 279 struct hostapd_data *hapd = ctx; 280 struct sta_info *sta; 281 u32 flags = 0; 282 283 sta = ap_get_sta(hapd, addr); 284 if (sta) 285 flags = hostapd_sta_flags_to_drv(sta->flags); 286 287 return hostapd_drv_hapd_send_eapol(hapd, addr, data, data_len, 288 encrypt, flags); 289 } 290 291 292 static int hostapd_wpa_auth_for_each_sta( 293 void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx), 294 void *cb_ctx) 295 { 296 struct hostapd_data *hapd = ctx; 297 struct sta_info *sta; 298 299 for (sta = hapd->sta_list; sta; sta = sta->next) { 300 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx)) 301 return 1; 302 } 303 return 0; 304 } 305 306 307 struct wpa_auth_iface_iter_data { 308 int (*cb)(struct wpa_authenticator *sm, void *ctx); 309 void *cb_ctx; 310 }; 311 312 static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx) 313 { 314 struct wpa_auth_iface_iter_data *data = ctx; 315 size_t i; 316 for (i = 0; i < iface->num_bss; i++) { 317 if (iface->bss[i]->wpa_auth && 318 data->cb(iface->bss[i]->wpa_auth, data->cb_ctx)) 319 return 1; 320 } 321 return 0; 322 } 323 324 325 static int hostapd_wpa_auth_for_each_auth( 326 void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx), 327 void *cb_ctx) 328 { 329 struct hostapd_data *hapd = ctx; 330 struct wpa_auth_iface_iter_data data; 331 if (hapd->iface->interfaces == NULL || 332 hapd->iface->interfaces->for_each_interface == NULL) 333 return -1; 334 data.cb = cb; 335 data.cb_ctx = cb_ctx; 336 return hapd->iface->interfaces->for_each_interface( 337 hapd->iface->interfaces, wpa_auth_iface_iter, &data); 338 } 339 340 341 #ifdef CONFIG_IEEE80211R 342 343 struct wpa_auth_ft_iface_iter_data { 344 struct hostapd_data *src_hapd; 345 const u8 *dst; 346 const u8 *data; 347 size_t data_len; 348 }; 349 350 351 static int hostapd_wpa_auth_ft_iter(struct hostapd_iface *iface, void *ctx) 352 { 353 struct wpa_auth_ft_iface_iter_data *idata = ctx; 354 struct hostapd_data *hapd; 355 size_t j; 356 357 for (j = 0; j < iface->num_bss; j++) { 358 hapd = iface->bss[j]; 359 if (hapd == idata->src_hapd) 360 continue; 361 if (os_memcmp(hapd->own_addr, idata->dst, ETH_ALEN) == 0) { 362 wpa_printf(MSG_DEBUG, "FT: Send RRB data directly to " 363 "locally managed BSS " MACSTR "@%s -> " 364 MACSTR "@%s", 365 MAC2STR(idata->src_hapd->own_addr), 366 idata->src_hapd->conf->iface, 367 MAC2STR(hapd->own_addr), hapd->conf->iface); 368 wpa_ft_rrb_rx(hapd->wpa_auth, 369 idata->src_hapd->own_addr, 370 idata->data, idata->data_len); 371 return 1; 372 } 373 } 374 375 return 0; 376 } 377 378 #endif /* CONFIG_IEEE80211R */ 379 380 381 static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto, 382 const u8 *data, size_t data_len) 383 { 384 struct hostapd_data *hapd = ctx; 385 struct l2_ethhdr *buf; 386 int ret; 387 388 #ifdef CONFIG_IEEE80211R 389 if (proto == ETH_P_RRB && hapd->iface->interfaces && 390 hapd->iface->interfaces->for_each_interface) { 391 int res; 392 struct wpa_auth_ft_iface_iter_data idata; 393 idata.src_hapd = hapd; 394 idata.dst = dst; 395 idata.data = data; 396 idata.data_len = data_len; 397 res = hapd->iface->interfaces->for_each_interface( 398 hapd->iface->interfaces, hostapd_wpa_auth_ft_iter, 399 &idata); 400 if (res == 1) 401 return data_len; 402 } 403 #endif /* CONFIG_IEEE80211R */ 404 405 if (hapd->driver && hapd->driver->send_ether) 406 return hapd->driver->send_ether(hapd->drv_priv, dst, 407 hapd->own_addr, proto, 408 data, data_len); 409 if (hapd->l2 == NULL) 410 return -1; 411 412 buf = os_malloc(sizeof(*buf) + data_len); 413 if (buf == NULL) 414 return -1; 415 os_memcpy(buf->h_dest, dst, ETH_ALEN); 416 os_memcpy(buf->h_source, hapd->own_addr, ETH_ALEN); 417 buf->h_proto = host_to_be16(proto); 418 os_memcpy(buf + 1, data, data_len); 419 ret = l2_packet_send(hapd->l2, dst, proto, (u8 *) buf, 420 sizeof(*buf) + data_len); 421 os_free(buf); 422 return ret; 423 } 424 425 426 #ifdef CONFIG_IEEE80211R 427 428 static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst, 429 const u8 *data, size_t data_len) 430 { 431 struct hostapd_data *hapd = ctx; 432 int res; 433 struct ieee80211_mgmt *m; 434 size_t mlen; 435 struct sta_info *sta; 436 437 sta = ap_get_sta(hapd, dst); 438 if (sta == NULL || sta->wpa_sm == NULL) 439 return -1; 440 441 m = os_zalloc(sizeof(*m) + data_len); 442 if (m == NULL) 443 return -1; 444 mlen = ((u8 *) &m->u - (u8 *) m) + data_len; 445 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 446 WLAN_FC_STYPE_ACTION); 447 os_memcpy(m->da, dst, ETH_ALEN); 448 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN); 449 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN); 450 os_memcpy(&m->u, data, data_len); 451 452 res = hostapd_drv_send_mlme(hapd, (u8 *) m, mlen, 0); 453 os_free(m); 454 return res; 455 } 456 457 458 static struct wpa_state_machine * 459 hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr) 460 { 461 struct hostapd_data *hapd = ctx; 462 struct sta_info *sta; 463 464 if (hostapd_add_sta_node(hapd, sta_addr, WLAN_AUTH_FT) < 0) 465 return NULL; 466 467 sta = ap_sta_add(hapd, sta_addr); 468 if (sta == NULL) 469 return NULL; 470 if (sta->wpa_sm) { 471 sta->auth_alg = WLAN_AUTH_FT; 472 return sta->wpa_sm; 473 } 474 475 sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr, NULL); 476 if (sta->wpa_sm == NULL) { 477 ap_free_sta(hapd, sta); 478 return NULL; 479 } 480 sta->auth_alg = WLAN_AUTH_FT; 481 482 return sta->wpa_sm; 483 } 484 485 486 static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf, 487 size_t len) 488 { 489 struct hostapd_data *hapd = ctx; 490 struct l2_ethhdr *ethhdr; 491 if (len < sizeof(*ethhdr)) 492 return; 493 ethhdr = (struct l2_ethhdr *) buf; 494 wpa_printf(MSG_DEBUG, "FT: RRB received packet " MACSTR " -> " 495 MACSTR, MAC2STR(ethhdr->h_source), MAC2STR(ethhdr->h_dest)); 496 wpa_ft_rrb_rx(hapd->wpa_auth, ethhdr->h_source, buf + sizeof(*ethhdr), 497 len - sizeof(*ethhdr)); 498 } 499 500 501 static int hostapd_wpa_auth_add_tspec(void *ctx, const u8 *sta_addr, 502 u8 *tspec_ie, size_t tspec_ielen) 503 { 504 struct hostapd_data *hapd = ctx; 505 return hostapd_add_tspec(hapd, sta_addr, tspec_ie, tspec_ielen); 506 } 507 508 #endif /* CONFIG_IEEE80211R */ 509 510 511 int hostapd_setup_wpa(struct hostapd_data *hapd) 512 { 513 struct wpa_auth_config _conf; 514 struct wpa_auth_callbacks cb; 515 const u8 *wpa_ie; 516 size_t wpa_ie_len; 517 518 hostapd_wpa_auth_conf(hapd->conf, hapd->iconf, &_conf); 519 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_EAPOL_TX_STATUS) 520 _conf.tx_status = 1; 521 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_MLME) 522 _conf.ap_mlme = 1; 523 os_memset(&cb, 0, sizeof(cb)); 524 cb.ctx = hapd; 525 cb.logger = hostapd_wpa_auth_logger; 526 cb.disconnect = hostapd_wpa_auth_disconnect; 527 cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report; 528 cb.set_eapol = hostapd_wpa_auth_set_eapol; 529 cb.get_eapol = hostapd_wpa_auth_get_eapol; 530 cb.get_psk = hostapd_wpa_auth_get_psk; 531 cb.get_msk = hostapd_wpa_auth_get_msk; 532 cb.set_key = hostapd_wpa_auth_set_key; 533 cb.get_seqnum = hostapd_wpa_auth_get_seqnum; 534 cb.send_eapol = hostapd_wpa_auth_send_eapol; 535 cb.for_each_sta = hostapd_wpa_auth_for_each_sta; 536 cb.for_each_auth = hostapd_wpa_auth_for_each_auth; 537 cb.send_ether = hostapd_wpa_auth_send_ether; 538 #ifdef CONFIG_IEEE80211R 539 cb.send_ft_action = hostapd_wpa_auth_send_ft_action; 540 cb.add_sta = hostapd_wpa_auth_add_sta; 541 cb.add_tspec = hostapd_wpa_auth_add_tspec; 542 #endif /* CONFIG_IEEE80211R */ 543 hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb); 544 if (hapd->wpa_auth == NULL) { 545 wpa_printf(MSG_ERROR, "WPA initialization failed."); 546 return -1; 547 } 548 549 if (hostapd_set_privacy(hapd, 1)) { 550 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked " 551 "for interface %s", hapd->conf->iface); 552 return -1; 553 } 554 555 wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len); 556 if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) { 557 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for " 558 "the kernel driver."); 559 return -1; 560 } 561 562 if (rsn_preauth_iface_init(hapd)) { 563 wpa_printf(MSG_ERROR, "Initialization of RSN " 564 "pre-authentication failed."); 565 return -1; 566 } 567 568 #ifdef CONFIG_IEEE80211R 569 if (!hostapd_drv_none(hapd)) { 570 hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ? 571 hapd->conf->bridge : 572 hapd->conf->iface, NULL, ETH_P_RRB, 573 hostapd_rrb_receive, hapd, 1); 574 if (hapd->l2 == NULL && 575 (hapd->driver == NULL || 576 hapd->driver->send_ether == NULL)) { 577 wpa_printf(MSG_ERROR, "Failed to open l2_packet " 578 "interface"); 579 return -1; 580 } 581 } 582 #endif /* CONFIG_IEEE80211R */ 583 584 return 0; 585 586 } 587 588 589 void hostapd_reconfig_wpa(struct hostapd_data *hapd) 590 { 591 struct wpa_auth_config wpa_auth_conf; 592 hostapd_wpa_auth_conf(hapd->conf, hapd->iconf, &wpa_auth_conf); 593 wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf); 594 } 595 596 597 void hostapd_deinit_wpa(struct hostapd_data *hapd) 598 { 599 ieee80211_tkip_countermeasures_deinit(hapd); 600 rsn_preauth_iface_deinit(hapd); 601 if (hapd->wpa_auth) { 602 wpa_deinit(hapd->wpa_auth); 603 hapd->wpa_auth = NULL; 604 605 if (hostapd_set_privacy(hapd, 0)) { 606 wpa_printf(MSG_DEBUG, "Could not disable " 607 "PrivacyInvoked for interface %s", 608 hapd->conf->iface); 609 } 610 611 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) { 612 wpa_printf(MSG_DEBUG, "Could not remove generic " 613 "information element from interface %s", 614 hapd->conf->iface); 615 } 616 } 617 ieee802_1x_deinit(hapd); 618 619 #ifdef CONFIG_IEEE80211R 620 l2_packet_deinit(hapd->l2); 621 #endif /* CONFIG_IEEE80211R */ 622 } 623
