1 /* 2 * hostapd / WPA authenticator glue code 3 * Copyright (c) 2002-2011, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "utils/includes.h" 16 17 #include "utils/common.h" 18 #include "common/ieee802_11_defs.h" 19 #include "eapol_auth/eapol_auth_sm.h" 20 #include "eapol_auth/eapol_auth_sm_i.h" 21 #include "eap_server/eap.h" 22 #include "l2_packet/l2_packet.h" 23 #include "drivers/driver.h" 24 #include "hostapd.h" 25 #include "ieee802_1x.h" 26 #include "preauth_auth.h" 27 #include "sta_info.h" 28 #include "tkip_countermeasures.h" 29 #include "ap_drv_ops.h" 30 #include "ap_config.h" 31 #include "wpa_auth.h" 32 33 34 static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf, 35 struct wpa_auth_config *wconf) 36 { 37 os_memset(wconf, 0, sizeof(*wconf)); 38 wconf->wpa = conf->wpa; 39 wconf->wpa_key_mgmt = conf->wpa_key_mgmt; 40 wconf->wpa_pairwise = conf->wpa_pairwise; 41 wconf->wpa_group = conf->wpa_group; 42 wconf->wpa_group_rekey = conf->wpa_group_rekey; 43 wconf->wpa_strict_rekey = conf->wpa_strict_rekey; 44 wconf->wpa_gmk_rekey = conf->wpa_gmk_rekey; 45 wconf->wpa_ptk_rekey = conf->wpa_ptk_rekey; 46 wconf->rsn_pairwise = conf->rsn_pairwise; 47 wconf->rsn_preauth = conf->rsn_preauth; 48 wconf->eapol_version = conf->eapol_version; 49 wconf->peerkey = conf->peerkey; 50 wconf->wmm_enabled = conf->wmm_enabled; 51 wconf->wmm_uapsd = conf->wmm_uapsd; 52 wconf->disable_pmksa_caching = conf->disable_pmksa_caching; 53 wconf->okc = conf->okc; 54 #ifdef CONFIG_IEEE80211W 55 wconf->ieee80211w = conf->ieee80211w; 56 #endif /* CONFIG_IEEE80211W */ 57 #ifdef CONFIG_IEEE80211R 58 wconf->ssid_len = conf->ssid.ssid_len; 59 if (wconf->ssid_len > SSID_LEN) 60 wconf->ssid_len = SSID_LEN; 61 os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len); 62 os_memcpy(wconf->mobility_domain, conf->mobility_domain, 63 MOBILITY_DOMAIN_ID_LEN); 64 if (conf->nas_identifier && 65 os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) { 66 wconf->r0_key_holder_len = os_strlen(conf->nas_identifier); 67 os_memcpy(wconf->r0_key_holder, conf->nas_identifier, 68 wconf->r0_key_holder_len); 69 } 70 os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN); 71 wconf->r0_key_lifetime = conf->r0_key_lifetime; 72 wconf->reassociation_deadline = conf->reassociation_deadline; 73 wconf->r0kh_list = conf->r0kh_list; 74 wconf->r1kh_list = conf->r1kh_list; 75 wconf->pmk_r1_push = conf->pmk_r1_push; 76 wconf->ft_over_ds = conf->ft_over_ds; 77 #endif /* CONFIG_IEEE80211R */ 78 } 79 80 81 static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr, 82 logger_level level, const char *txt) 83 { 84 #ifndef CONFIG_NO_HOSTAPD_LOGGER 85 struct hostapd_data *hapd = ctx; 86 int hlevel; 87 88 switch (level) { 89 case LOGGER_WARNING: 90 hlevel = HOSTAPD_LEVEL_WARNING; 91 break; 92 case LOGGER_INFO: 93 hlevel = HOSTAPD_LEVEL_INFO; 94 break; 95 case LOGGER_DEBUG: 96 default: 97 hlevel = HOSTAPD_LEVEL_DEBUG; 98 break; 99 } 100 101 hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt); 102 #endif /* CONFIG_NO_HOSTAPD_LOGGER */ 103 } 104 105 106 static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr, 107 u16 reason) 108 { 109 struct hostapd_data *hapd = ctx; 110 wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: " 111 "STA " MACSTR " reason %d", 112 __func__, MAC2STR(addr), reason); 113 ap_sta_disconnect(hapd, NULL, addr, reason); 114 } 115 116 117 static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr) 118 { 119 struct hostapd_data *hapd = ctx; 120 michael_mic_failure(hapd, addr, 0); 121 } 122 123 124 static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr, 125 wpa_eapol_variable var, int value) 126 { 127 struct hostapd_data *hapd = ctx; 128 struct sta_info *sta = ap_get_sta(hapd, addr); 129 if (sta == NULL) 130 return; 131 switch (var) { 132 case WPA_EAPOL_portEnabled: 133 ieee802_1x_notify_port_enabled(sta->eapol_sm, value); 134 break; 135 case WPA_EAPOL_portValid: 136 ieee802_1x_notify_port_valid(sta->eapol_sm, value); 137 break; 138 case WPA_EAPOL_authorized: 139 ieee802_1x_set_sta_authorized(hapd, sta, value); 140 break; 141 case WPA_EAPOL_portControl_Auto: 142 if (sta->eapol_sm) 143 sta->eapol_sm->portControl = Auto; 144 break; 145 case WPA_EAPOL_keyRun: 146 if (sta->eapol_sm) 147 sta->eapol_sm->keyRun = value ? TRUE : FALSE; 148 break; 149 case WPA_EAPOL_keyAvailable: 150 if (sta->eapol_sm) 151 sta->eapol_sm->eap_if->eapKeyAvailable = 152 value ? TRUE : FALSE; 153 break; 154 case WPA_EAPOL_keyDone: 155 if (sta->eapol_sm) 156 sta->eapol_sm->keyDone = value ? TRUE : FALSE; 157 break; 158 case WPA_EAPOL_inc_EapolFramesTx: 159 if (sta->eapol_sm) 160 sta->eapol_sm->dot1xAuthEapolFramesTx++; 161 break; 162 } 163 } 164 165 166 static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr, 167 wpa_eapol_variable var) 168 { 169 struct hostapd_data *hapd = ctx; 170 struct sta_info *sta = ap_get_sta(hapd, addr); 171 if (sta == NULL || sta->eapol_sm == NULL) 172 return -1; 173 switch (var) { 174 case WPA_EAPOL_keyRun: 175 return sta->eapol_sm->keyRun; 176 case WPA_EAPOL_keyAvailable: 177 return sta->eapol_sm->eap_if->eapKeyAvailable; 178 default: 179 return -1; 180 } 181 } 182 183 184 static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr, 185 const u8 *prev_psk) 186 { 187 struct hostapd_data *hapd = ctx; 188 return hostapd_get_psk(hapd->conf, addr, prev_psk); 189 } 190 191 192 static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk, 193 size_t *len) 194 { 195 struct hostapd_data *hapd = ctx; 196 const u8 *key; 197 size_t keylen; 198 struct sta_info *sta; 199 200 sta = ap_get_sta(hapd, addr); 201 if (sta == NULL) 202 return -1; 203 204 key = ieee802_1x_get_key(sta->eapol_sm, &keylen); 205 if (key == NULL) 206 return -1; 207 208 if (keylen > *len) 209 keylen = *len; 210 os_memcpy(msk, key, keylen); 211 *len = keylen; 212 213 return 0; 214 } 215 216 217 static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg, 218 const u8 *addr, int idx, u8 *key, 219 size_t key_len) 220 { 221 struct hostapd_data *hapd = ctx; 222 const char *ifname = hapd->conf->iface; 223 224 if (vlan_id > 0) { 225 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id); 226 if (ifname == NULL) 227 return -1; 228 } 229 230 return hostapd_drv_set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0, 231 key, key_len); 232 } 233 234 235 static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx, 236 u8 *seq) 237 { 238 struct hostapd_data *hapd = ctx; 239 return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq); 240 } 241 242 243 static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr, 244 const u8 *data, size_t data_len, 245 int encrypt) 246 { 247 struct hostapd_data *hapd = ctx; 248 struct sta_info *sta; 249 u32 flags = 0; 250 251 sta = ap_get_sta(hapd, addr); 252 if (sta) 253 flags = hostapd_sta_flags_to_drv(sta->flags); 254 255 return hostapd_drv_hapd_send_eapol(hapd, addr, data, data_len, 256 encrypt, flags); 257 } 258 259 260 static int hostapd_wpa_auth_for_each_sta( 261 void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx), 262 void *cb_ctx) 263 { 264 struct hostapd_data *hapd = ctx; 265 struct sta_info *sta; 266 267 for (sta = hapd->sta_list; sta; sta = sta->next) { 268 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx)) 269 return 1; 270 } 271 return 0; 272 } 273 274 275 struct wpa_auth_iface_iter_data { 276 int (*cb)(struct wpa_authenticator *sm, void *ctx); 277 void *cb_ctx; 278 }; 279 280 static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx) 281 { 282 struct wpa_auth_iface_iter_data *data = ctx; 283 size_t i; 284 for (i = 0; i < iface->num_bss; i++) { 285 if (iface->bss[i]->wpa_auth && 286 data->cb(iface->bss[i]->wpa_auth, data->cb_ctx)) 287 return 1; 288 } 289 return 0; 290 } 291 292 293 static int hostapd_wpa_auth_for_each_auth( 294 void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx), 295 void *cb_ctx) 296 { 297 struct hostapd_data *hapd = ctx; 298 struct wpa_auth_iface_iter_data data; 299 if (hapd->iface->for_each_interface == NULL) 300 return -1; 301 data.cb = cb; 302 data.cb_ctx = cb_ctx; 303 return hapd->iface->for_each_interface(hapd->iface->interfaces, 304 wpa_auth_iface_iter, &data); 305 } 306 307 308 #ifdef CONFIG_IEEE80211R 309 310 struct wpa_auth_ft_iface_iter_data { 311 struct hostapd_data *src_hapd; 312 const u8 *dst; 313 const u8 *data; 314 size_t data_len; 315 }; 316 317 318 static int hostapd_wpa_auth_ft_iter(struct hostapd_iface *iface, void *ctx) 319 { 320 struct wpa_auth_ft_iface_iter_data *idata = ctx; 321 struct hostapd_data *hapd; 322 size_t j; 323 324 for (j = 0; j < iface->num_bss; j++) { 325 hapd = iface->bss[j]; 326 if (hapd == idata->src_hapd) 327 continue; 328 if (os_memcmp(hapd->own_addr, idata->dst, ETH_ALEN) == 0) { 329 wpa_printf(MSG_DEBUG, "FT: Send RRB data directly to " 330 "locally managed BSS " MACSTR "@%s -> " 331 MACSTR "@%s", 332 MAC2STR(idata->src_hapd->own_addr), 333 idata->src_hapd->conf->iface, 334 MAC2STR(hapd->own_addr), hapd->conf->iface); 335 wpa_ft_rrb_rx(hapd->wpa_auth, 336 idata->src_hapd->own_addr, 337 idata->data, idata->data_len); 338 return 1; 339 } 340 } 341 342 return 0; 343 } 344 345 #endif /* CONFIG_IEEE80211R */ 346 347 348 static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto, 349 const u8 *data, size_t data_len) 350 { 351 struct hostapd_data *hapd = ctx; 352 struct l2_ethhdr *buf; 353 int ret; 354 355 #ifdef CONFIG_IEEE80211R 356 if (proto == ETH_P_RRB && hapd->iface->for_each_interface) { 357 int res; 358 struct wpa_auth_ft_iface_iter_data idata; 359 idata.src_hapd = hapd; 360 idata.dst = dst; 361 idata.data = data; 362 idata.data_len = data_len; 363 res = hapd->iface->for_each_interface(hapd->iface->interfaces, 364 hostapd_wpa_auth_ft_iter, 365 &idata); 366 if (res == 1) 367 return data_len; 368 } 369 #endif /* CONFIG_IEEE80211R */ 370 371 if (hapd->driver && hapd->driver->send_ether) 372 return hapd->driver->send_ether(hapd->drv_priv, dst, 373 hapd->own_addr, proto, 374 data, data_len); 375 if (hapd->l2 == NULL) 376 return -1; 377 378 buf = os_malloc(sizeof(*buf) + data_len); 379 if (buf == NULL) 380 return -1; 381 os_memcpy(buf->h_dest, dst, ETH_ALEN); 382 os_memcpy(buf->h_source, hapd->own_addr, ETH_ALEN); 383 buf->h_proto = host_to_be16(proto); 384 os_memcpy(buf + 1, data, data_len); 385 ret = l2_packet_send(hapd->l2, dst, proto, (u8 *) buf, 386 sizeof(*buf) + data_len); 387 os_free(buf); 388 return ret; 389 } 390 391 392 #ifdef CONFIG_IEEE80211R 393 394 static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst, 395 const u8 *data, size_t data_len) 396 { 397 struct hostapd_data *hapd = ctx; 398 int res; 399 struct ieee80211_mgmt *m; 400 size_t mlen; 401 struct sta_info *sta; 402 403 sta = ap_get_sta(hapd, dst); 404 if (sta == NULL || sta->wpa_sm == NULL) 405 return -1; 406 407 m = os_zalloc(sizeof(*m) + data_len); 408 if (m == NULL) 409 return -1; 410 mlen = ((u8 *) &m->u - (u8 *) m) + data_len; 411 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 412 WLAN_FC_STYPE_ACTION); 413 os_memcpy(m->da, dst, ETH_ALEN); 414 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN); 415 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN); 416 os_memcpy(&m->u, data, data_len); 417 418 res = hostapd_drv_send_mlme(hapd, (u8 *) m, mlen); 419 os_free(m); 420 return res; 421 } 422 423 424 static struct wpa_state_machine * 425 hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr) 426 { 427 struct hostapd_data *hapd = ctx; 428 struct sta_info *sta; 429 430 sta = ap_sta_add(hapd, sta_addr); 431 if (sta == NULL) 432 return NULL; 433 if (sta->wpa_sm) { 434 sta->auth_alg = WLAN_AUTH_FT; 435 return sta->wpa_sm; 436 } 437 438 sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr); 439 if (sta->wpa_sm == NULL) { 440 ap_free_sta(hapd, sta); 441 return NULL; 442 } 443 sta->auth_alg = WLAN_AUTH_FT; 444 445 return sta->wpa_sm; 446 } 447 448 449 static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf, 450 size_t len) 451 { 452 struct hostapd_data *hapd = ctx; 453 struct l2_ethhdr *ethhdr; 454 if (len < sizeof(*ethhdr)) 455 return; 456 ethhdr = (struct l2_ethhdr *) buf; 457 wpa_printf(MSG_DEBUG, "FT: RRB received packet " MACSTR " -> " 458 MACSTR, MAC2STR(ethhdr->h_source), MAC2STR(ethhdr->h_dest)); 459 wpa_ft_rrb_rx(hapd->wpa_auth, ethhdr->h_source, buf + sizeof(*ethhdr), 460 len - sizeof(*ethhdr)); 461 } 462 463 #endif /* CONFIG_IEEE80211R */ 464 465 466 int hostapd_setup_wpa(struct hostapd_data *hapd) 467 { 468 struct wpa_auth_config _conf; 469 struct wpa_auth_callbacks cb; 470 const u8 *wpa_ie; 471 size_t wpa_ie_len; 472 473 hostapd_wpa_auth_conf(hapd->conf, &_conf); 474 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_EAPOL_TX_STATUS) 475 _conf.tx_status = 1; 476 os_memset(&cb, 0, sizeof(cb)); 477 cb.ctx = hapd; 478 cb.logger = hostapd_wpa_auth_logger; 479 cb.disconnect = hostapd_wpa_auth_disconnect; 480 cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report; 481 cb.set_eapol = hostapd_wpa_auth_set_eapol; 482 cb.get_eapol = hostapd_wpa_auth_get_eapol; 483 cb.get_psk = hostapd_wpa_auth_get_psk; 484 cb.get_msk = hostapd_wpa_auth_get_msk; 485 cb.set_key = hostapd_wpa_auth_set_key; 486 cb.get_seqnum = hostapd_wpa_auth_get_seqnum; 487 cb.send_eapol = hostapd_wpa_auth_send_eapol; 488 cb.for_each_sta = hostapd_wpa_auth_for_each_sta; 489 cb.for_each_auth = hostapd_wpa_auth_for_each_auth; 490 cb.send_ether = hostapd_wpa_auth_send_ether; 491 #ifdef CONFIG_IEEE80211R 492 cb.send_ft_action = hostapd_wpa_auth_send_ft_action; 493 cb.add_sta = hostapd_wpa_auth_add_sta; 494 #endif /* CONFIG_IEEE80211R */ 495 hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb); 496 if (hapd->wpa_auth == NULL) { 497 wpa_printf(MSG_ERROR, "WPA initialization failed."); 498 return -1; 499 } 500 501 if (hostapd_set_privacy(hapd, 1)) { 502 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked " 503 "for interface %s", hapd->conf->iface); 504 return -1; 505 } 506 507 wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len); 508 if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) { 509 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for " 510 "the kernel driver."); 511 return -1; 512 } 513 514 if (rsn_preauth_iface_init(hapd)) { 515 wpa_printf(MSG_ERROR, "Initialization of RSN " 516 "pre-authentication failed."); 517 return -1; 518 } 519 520 #ifdef CONFIG_IEEE80211R 521 if (!hostapd_drv_none(hapd)) { 522 hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ? 523 hapd->conf->bridge : 524 hapd->conf->iface, NULL, ETH_P_RRB, 525 hostapd_rrb_receive, hapd, 1); 526 if (hapd->l2 == NULL && 527 (hapd->driver == NULL || 528 hapd->driver->send_ether == NULL)) { 529 wpa_printf(MSG_ERROR, "Failed to open l2_packet " 530 "interface"); 531 return -1; 532 } 533 } 534 #endif /* CONFIG_IEEE80211R */ 535 536 return 0; 537 538 } 539 540 541 void hostapd_reconfig_wpa(struct hostapd_data *hapd) 542 { 543 struct wpa_auth_config wpa_auth_conf; 544 hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf); 545 wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf); 546 } 547 548 549 void hostapd_deinit_wpa(struct hostapd_data *hapd) 550 { 551 ieee80211_tkip_countermeasures_deinit(hapd); 552 rsn_preauth_iface_deinit(hapd); 553 if (hapd->wpa_auth) { 554 wpa_deinit(hapd->wpa_auth); 555 hapd->wpa_auth = NULL; 556 557 if (hostapd_set_privacy(hapd, 0)) { 558 wpa_printf(MSG_DEBUG, "Could not disable " 559 "PrivacyInvoked for interface %s", 560 hapd->conf->iface); 561 } 562 563 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) { 564 wpa_printf(MSG_DEBUG, "Could not remove generic " 565 "information element from interface %s", 566 hapd->conf->iface); 567 } 568 } 569 ieee802_1x_deinit(hapd); 570 571 #ifdef CONFIG_IEEE80211R 572 l2_packet_deinit(hapd->l2); 573 #endif /* CONFIG_IEEE80211R */ 574 } 575