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