1 /* 2 * hostapd / WPA authenticator glue code 3 * Copyright (c) 2002-2009, 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 wconf->wpa = conf->wpa; 38 wconf->wpa_key_mgmt = conf->wpa_key_mgmt; 39 wconf->wpa_pairwise = conf->wpa_pairwise; 40 wconf->wpa_group = conf->wpa_group; 41 wconf->wpa_group_rekey = conf->wpa_group_rekey; 42 wconf->wpa_strict_rekey = conf->wpa_strict_rekey; 43 wconf->wpa_gmk_rekey = conf->wpa_gmk_rekey; 44 wconf->wpa_ptk_rekey = conf->wpa_ptk_rekey; 45 wconf->rsn_pairwise = conf->rsn_pairwise; 46 wconf->rsn_preauth = conf->rsn_preauth; 47 wconf->eapol_version = conf->eapol_version; 48 wconf->peerkey = conf->peerkey; 49 wconf->wmm_enabled = conf->wmm_enabled; 50 wconf->wmm_uapsd = conf->wmm_uapsd; 51 wconf->okc = conf->okc; 52 #ifdef CONFIG_IEEE80211W 53 wconf->ieee80211w = conf->ieee80211w; 54 #endif /* CONFIG_IEEE80211W */ 55 #ifdef CONFIG_IEEE80211R 56 wconf->ssid_len = conf->ssid.ssid_len; 57 if (wconf->ssid_len > SSID_LEN) 58 wconf->ssid_len = SSID_LEN; 59 os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len); 60 os_memcpy(wconf->mobility_domain, conf->mobility_domain, 61 MOBILITY_DOMAIN_ID_LEN); 62 if (conf->nas_identifier && 63 os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) { 64 wconf->r0_key_holder_len = os_strlen(conf->nas_identifier); 65 os_memcpy(wconf->r0_key_holder, conf->nas_identifier, 66 wconf->r0_key_holder_len); 67 } 68 os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN); 69 wconf->r0_key_lifetime = conf->r0_key_lifetime; 70 wconf->reassociation_deadline = conf->reassociation_deadline; 71 wconf->r0kh_list = conf->r0kh_list; 72 wconf->r1kh_list = conf->r1kh_list; 73 wconf->pmk_r1_push = conf->pmk_r1_push; 74 #endif /* CONFIG_IEEE80211R */ 75 } 76 77 78 static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr, 79 logger_level level, const char *txt) 80 { 81 #ifndef CONFIG_NO_HOSTAPD_LOGGER 82 struct hostapd_data *hapd = ctx; 83 int hlevel; 84 85 switch (level) { 86 case LOGGER_WARNING: 87 hlevel = HOSTAPD_LEVEL_WARNING; 88 break; 89 case LOGGER_INFO: 90 hlevel = HOSTAPD_LEVEL_INFO; 91 break; 92 case LOGGER_DEBUG: 93 default: 94 hlevel = HOSTAPD_LEVEL_DEBUG; 95 break; 96 } 97 98 hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt); 99 #endif /* CONFIG_NO_HOSTAPD_LOGGER */ 100 } 101 102 103 static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr, 104 u16 reason) 105 { 106 struct hostapd_data *hapd = ctx; 107 wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: " 108 "STA " MACSTR " reason %d", 109 __func__, MAC2STR(addr), reason); 110 ap_sta_disconnect(hapd, NULL, addr, reason); 111 } 112 113 114 static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr) 115 { 116 struct hostapd_data *hapd = ctx; 117 michael_mic_failure(hapd, addr, 0); 118 } 119 120 121 static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr, 122 wpa_eapol_variable var, int value) 123 { 124 struct hostapd_data *hapd = ctx; 125 struct sta_info *sta = ap_get_sta(hapd, addr); 126 if (sta == NULL) 127 return; 128 switch (var) { 129 case WPA_EAPOL_portEnabled: 130 ieee802_1x_notify_port_enabled(sta->eapol_sm, value); 131 break; 132 case WPA_EAPOL_portValid: 133 ieee802_1x_notify_port_valid(sta->eapol_sm, value); 134 break; 135 case WPA_EAPOL_authorized: 136 ieee802_1x_set_sta_authorized(hapd, sta, value); 137 break; 138 case WPA_EAPOL_portControl_Auto: 139 if (sta->eapol_sm) 140 sta->eapol_sm->portControl = Auto; 141 break; 142 case WPA_EAPOL_keyRun: 143 if (sta->eapol_sm) 144 sta->eapol_sm->keyRun = value ? TRUE : FALSE; 145 break; 146 case WPA_EAPOL_keyAvailable: 147 if (sta->eapol_sm) 148 sta->eapol_sm->eap_if->eapKeyAvailable = 149 value ? TRUE : FALSE; 150 break; 151 case WPA_EAPOL_keyDone: 152 if (sta->eapol_sm) 153 sta->eapol_sm->keyDone = value ? TRUE : FALSE; 154 break; 155 case WPA_EAPOL_inc_EapolFramesTx: 156 if (sta->eapol_sm) 157 sta->eapol_sm->dot1xAuthEapolFramesTx++; 158 break; 159 } 160 } 161 162 163 static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr, 164 wpa_eapol_variable var) 165 { 166 struct hostapd_data *hapd = ctx; 167 struct sta_info *sta = ap_get_sta(hapd, addr); 168 if (sta == NULL || sta->eapol_sm == NULL) 169 return -1; 170 switch (var) { 171 case WPA_EAPOL_keyRun: 172 return sta->eapol_sm->keyRun; 173 case WPA_EAPOL_keyAvailable: 174 return sta->eapol_sm->eap_if->eapKeyAvailable; 175 default: 176 return -1; 177 } 178 } 179 180 181 static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr, 182 const u8 *prev_psk) 183 { 184 struct hostapd_data *hapd = ctx; 185 return hostapd_get_psk(hapd->conf, addr, prev_psk); 186 } 187 188 189 static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk, 190 size_t *len) 191 { 192 struct hostapd_data *hapd = ctx; 193 const u8 *key; 194 size_t keylen; 195 struct sta_info *sta; 196 197 sta = ap_get_sta(hapd, addr); 198 if (sta == NULL) 199 return -1; 200 201 key = ieee802_1x_get_key(sta->eapol_sm, &keylen); 202 if (key == NULL) 203 return -1; 204 205 if (keylen > *len) 206 keylen = *len; 207 os_memcpy(msk, key, keylen); 208 *len = keylen; 209 210 return 0; 211 } 212 213 214 static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg, 215 const u8 *addr, int idx, u8 *key, 216 size_t key_len) 217 { 218 struct hostapd_data *hapd = ctx; 219 const char *ifname = hapd->conf->iface; 220 221 if (vlan_id > 0) { 222 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id); 223 if (ifname == NULL) 224 return -1; 225 } 226 227 return hapd->drv.set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0, 228 key, key_len); 229 } 230 231 232 static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx, 233 u8 *seq) 234 { 235 struct hostapd_data *hapd = ctx; 236 return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq); 237 } 238 239 240 static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr, 241 const u8 *data, size_t data_len, 242 int encrypt) 243 { 244 struct hostapd_data *hapd = ctx; 245 return hapd->drv.send_eapol(hapd, addr, data, data_len, encrypt); 246 } 247 248 249 static int hostapd_wpa_auth_for_each_sta( 250 void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx), 251 void *cb_ctx) 252 { 253 struct hostapd_data *hapd = ctx; 254 struct sta_info *sta; 255 256 for (sta = hapd->sta_list; sta; sta = sta->next) { 257 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx)) 258 return 1; 259 } 260 return 0; 261 } 262 263 264 struct wpa_auth_iface_iter_data { 265 int (*cb)(struct wpa_authenticator *sm, void *ctx); 266 void *cb_ctx; 267 }; 268 269 static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx) 270 { 271 struct wpa_auth_iface_iter_data *data = ctx; 272 size_t i; 273 for (i = 0; i < iface->num_bss; i++) { 274 if (iface->bss[i]->wpa_auth && 275 data->cb(iface->bss[i]->wpa_auth, data->cb_ctx)) 276 return 1; 277 } 278 return 0; 279 } 280 281 282 static int hostapd_wpa_auth_for_each_auth( 283 void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx), 284 void *cb_ctx) 285 { 286 struct hostapd_data *hapd = ctx; 287 struct wpa_auth_iface_iter_data data; 288 if (hapd->iface->for_each_interface == NULL) 289 return -1; 290 data.cb = cb; 291 data.cb_ctx = cb_ctx; 292 return hapd->iface->for_each_interface(hapd->iface->interfaces, 293 wpa_auth_iface_iter, &data); 294 } 295 296 297 static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto, 298 const u8 *data, size_t data_len) 299 { 300 struct hostapd_data *hapd = ctx; 301 302 if (hapd->driver && hapd->driver->send_ether) 303 return hapd->driver->send_ether(hapd->drv_priv, dst, 304 hapd->own_addr, proto, 305 data, data_len); 306 if (hapd->l2 == NULL) 307 return -1; 308 return l2_packet_send(hapd->l2, dst, proto, data, data_len); 309 } 310 311 312 #ifdef CONFIG_IEEE80211R 313 314 static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst, 315 const u8 *data, size_t data_len) 316 { 317 struct hostapd_data *hapd = ctx; 318 int res; 319 struct ieee80211_mgmt *m; 320 size_t mlen; 321 struct sta_info *sta; 322 323 sta = ap_get_sta(hapd, dst); 324 if (sta == NULL || sta->wpa_sm == NULL) 325 return -1; 326 327 m = os_zalloc(sizeof(*m) + data_len); 328 if (m == NULL) 329 return -1; 330 mlen = ((u8 *) &m->u - (u8 *) m) + data_len; 331 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 332 WLAN_FC_STYPE_ACTION); 333 os_memcpy(m->da, dst, ETH_ALEN); 334 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN); 335 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN); 336 os_memcpy(&m->u, data, data_len); 337 338 res = hapd->drv.send_mgmt_frame(hapd, (u8 *) m, mlen); 339 os_free(m); 340 return res; 341 } 342 343 344 static struct wpa_state_machine * 345 hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr) 346 { 347 struct hostapd_data *hapd = ctx; 348 struct sta_info *sta; 349 350 sta = ap_sta_add(hapd, sta_addr); 351 if (sta == NULL) 352 return NULL; 353 if (sta->wpa_sm) { 354 sta->auth_alg = WLAN_AUTH_FT; 355 return sta->wpa_sm; 356 } 357 358 sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr); 359 if (sta->wpa_sm == NULL) { 360 ap_free_sta(hapd, sta); 361 return NULL; 362 } 363 sta->auth_alg = WLAN_AUTH_FT; 364 365 return sta->wpa_sm; 366 } 367 368 369 static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf, 370 size_t len) 371 { 372 struct hostapd_data *hapd = ctx; 373 wpa_ft_rrb_rx(hapd->wpa_auth, src_addr, buf, len); 374 } 375 376 #endif /* CONFIG_IEEE80211R */ 377 378 379 int hostapd_setup_wpa(struct hostapd_data *hapd) 380 { 381 struct wpa_auth_config _conf; 382 struct wpa_auth_callbacks cb; 383 const u8 *wpa_ie; 384 size_t wpa_ie_len; 385 386 hostapd_wpa_auth_conf(hapd->conf, &_conf); 387 os_memset(&cb, 0, sizeof(cb)); 388 cb.ctx = hapd; 389 cb.logger = hostapd_wpa_auth_logger; 390 cb.disconnect = hostapd_wpa_auth_disconnect; 391 cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report; 392 cb.set_eapol = hostapd_wpa_auth_set_eapol; 393 cb.get_eapol = hostapd_wpa_auth_get_eapol; 394 cb.get_psk = hostapd_wpa_auth_get_psk; 395 cb.get_msk = hostapd_wpa_auth_get_msk; 396 cb.set_key = hostapd_wpa_auth_set_key; 397 cb.get_seqnum = hostapd_wpa_auth_get_seqnum; 398 cb.send_eapol = hostapd_wpa_auth_send_eapol; 399 cb.for_each_sta = hostapd_wpa_auth_for_each_sta; 400 cb.for_each_auth = hostapd_wpa_auth_for_each_auth; 401 cb.send_ether = hostapd_wpa_auth_send_ether; 402 #ifdef CONFIG_IEEE80211R 403 cb.send_ft_action = hostapd_wpa_auth_send_ft_action; 404 cb.add_sta = hostapd_wpa_auth_add_sta; 405 #endif /* CONFIG_IEEE80211R */ 406 hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb); 407 if (hapd->wpa_auth == NULL) { 408 wpa_printf(MSG_ERROR, "WPA initialization failed."); 409 return -1; 410 } 411 412 if (hostapd_set_privacy(hapd, 1)) { 413 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked " 414 "for interface %s", hapd->conf->iface); 415 return -1; 416 } 417 418 wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len); 419 if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) { 420 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for " 421 "the kernel driver."); 422 return -1; 423 } 424 425 if (rsn_preauth_iface_init(hapd)) { 426 wpa_printf(MSG_ERROR, "Initialization of RSN " 427 "pre-authentication failed."); 428 return -1; 429 } 430 431 #ifdef CONFIG_IEEE80211R 432 if (!hostapd_drv_none(hapd)) { 433 hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ? 434 hapd->conf->bridge : 435 hapd->conf->iface, NULL, ETH_P_RRB, 436 hostapd_rrb_receive, hapd, 0); 437 if (hapd->l2 == NULL && 438 (hapd->driver == NULL || 439 hapd->driver->send_ether == NULL)) { 440 wpa_printf(MSG_ERROR, "Failed to open l2_packet " 441 "interface"); 442 return -1; 443 } 444 } 445 #endif /* CONFIG_IEEE80211R */ 446 447 return 0; 448 449 } 450 451 452 void hostapd_reconfig_wpa(struct hostapd_data *hapd) 453 { 454 struct wpa_auth_config wpa_auth_conf; 455 hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf); 456 wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf); 457 } 458 459 460 void hostapd_deinit_wpa(struct hostapd_data *hapd) 461 { 462 rsn_preauth_iface_deinit(hapd); 463 if (hapd->wpa_auth) { 464 wpa_deinit(hapd->wpa_auth); 465 hapd->wpa_auth = NULL; 466 467 if (hostapd_set_privacy(hapd, 0)) { 468 wpa_printf(MSG_DEBUG, "Could not disable " 469 "PrivacyInvoked for interface %s", 470 hapd->conf->iface); 471 } 472 473 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) { 474 wpa_printf(MSG_DEBUG, "Could not remove generic " 475 "information element from interface %s", 476 hapd->conf->iface); 477 } 478 } 479 ieee802_1x_deinit(hapd); 480 481 #ifdef CONFIG_IEEE80211R 482 l2_packet_deinit(hapd->l2); 483 #endif /* CONFIG_IEEE80211R */ 484 } 485