wpa_auth_glue.c revision c55524ad84d13014e8019491c2b17e5dcf13545a
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 34static 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->disable_pmksa_caching = conf->disable_pmksa_caching; 52 wconf->okc = conf->okc; 53#ifdef CONFIG_IEEE80211W 54 wconf->ieee80211w = conf->ieee80211w; 55#endif /* CONFIG_IEEE80211W */ 56#ifdef CONFIG_IEEE80211R 57 wconf->ssid_len = conf->ssid.ssid_len; 58 if (wconf->ssid_len > SSID_LEN) 59 wconf->ssid_len = SSID_LEN; 60 os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len); 61 os_memcpy(wconf->mobility_domain, conf->mobility_domain, 62 MOBILITY_DOMAIN_ID_LEN); 63 if (conf->nas_identifier && 64 os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) { 65 wconf->r0_key_holder_len = os_strlen(conf->nas_identifier); 66 os_memcpy(wconf->r0_key_holder, conf->nas_identifier, 67 wconf->r0_key_holder_len); 68 } 69 os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN); 70 wconf->r0_key_lifetime = conf->r0_key_lifetime; 71 wconf->reassociation_deadline = conf->reassociation_deadline; 72 wconf->r0kh_list = conf->r0kh_list; 73 wconf->r1kh_list = conf->r1kh_list; 74 wconf->pmk_r1_push = conf->pmk_r1_push; 75 wconf->ft_over_ds = conf->ft_over_ds; 76#endif /* CONFIG_IEEE80211R */ 77} 78 79 80static 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 105static 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 116static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr) 117{ 118 struct hostapd_data *hapd = ctx; 119 michael_mic_failure(hapd, addr, 0); 120} 121 122 123static 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 165static 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 183static 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 return hostapd_get_psk(hapd->conf, addr, prev_psk); 188} 189 190 191static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk, 192 size_t *len) 193{ 194 struct hostapd_data *hapd = ctx; 195 const u8 *key; 196 size_t keylen; 197 struct sta_info *sta; 198 199 sta = ap_get_sta(hapd, addr); 200 if (sta == NULL) 201 return -1; 202 203 key = ieee802_1x_get_key(sta->eapol_sm, &keylen); 204 if (key == NULL) 205 return -1; 206 207 if (keylen > *len) 208 keylen = *len; 209 os_memcpy(msk, key, keylen); 210 *len = keylen; 211 212 return 0; 213} 214 215 216static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg, 217 const u8 *addr, int idx, u8 *key, 218 size_t key_len) 219{ 220 struct hostapd_data *hapd = ctx; 221 const char *ifname = hapd->conf->iface; 222 223 if (vlan_id > 0) { 224 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id); 225 if (ifname == NULL) 226 return -1; 227 } 228 229 return hostapd_drv_set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0, 230 key, key_len); 231} 232 233 234static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx, 235 u8 *seq) 236{ 237 struct hostapd_data *hapd = ctx; 238 return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq); 239} 240 241 242static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr, 243 const u8 *data, size_t data_len, 244 int encrypt) 245{ 246 struct hostapd_data *hapd = ctx; 247 struct sta_info *sta; 248 u32 flags = 0; 249 250 sta = ap_get_sta(hapd, addr); 251 if (sta) 252 flags = hostapd_sta_flags_to_drv(sta->flags); 253 254 return hostapd_drv_hapd_send_eapol(hapd, addr, data, data_len, 255 encrypt, flags); 256} 257 258 259static int hostapd_wpa_auth_for_each_sta( 260 void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx), 261 void *cb_ctx) 262{ 263 struct hostapd_data *hapd = ctx; 264 struct sta_info *sta; 265 266 for (sta = hapd->sta_list; sta; sta = sta->next) { 267 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx)) 268 return 1; 269 } 270 return 0; 271} 272 273 274struct wpa_auth_iface_iter_data { 275 int (*cb)(struct wpa_authenticator *sm, void *ctx); 276 void *cb_ctx; 277}; 278 279static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx) 280{ 281 struct wpa_auth_iface_iter_data *data = ctx; 282 size_t i; 283 for (i = 0; i < iface->num_bss; i++) { 284 if (iface->bss[i]->wpa_auth && 285 data->cb(iface->bss[i]->wpa_auth, data->cb_ctx)) 286 return 1; 287 } 288 return 0; 289} 290 291 292static int hostapd_wpa_auth_for_each_auth( 293 void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx), 294 void *cb_ctx) 295{ 296 struct hostapd_data *hapd = ctx; 297 struct wpa_auth_iface_iter_data data; 298 if (hapd->iface->for_each_interface == NULL) 299 return -1; 300 data.cb = cb; 301 data.cb_ctx = cb_ctx; 302 return hapd->iface->for_each_interface(hapd->iface->interfaces, 303 wpa_auth_iface_iter, &data); 304} 305 306 307#ifdef CONFIG_IEEE80211R 308 309struct wpa_auth_ft_iface_iter_data { 310 struct hostapd_data *src_hapd; 311 const u8 *dst; 312 const u8 *data; 313 size_t data_len; 314}; 315 316 317static int hostapd_wpa_auth_ft_iter(struct hostapd_iface *iface, void *ctx) 318{ 319 struct wpa_auth_ft_iface_iter_data *idata = ctx; 320 struct hostapd_data *hapd; 321 size_t j; 322 323 for (j = 0; j < iface->num_bss; j++) { 324 hapd = iface->bss[j]; 325 if (hapd == idata->src_hapd) 326 continue; 327 if (os_memcmp(hapd->own_addr, idata->dst, ETH_ALEN) == 0) { 328 wpa_printf(MSG_DEBUG, "FT: Send RRB data directly to " 329 "locally managed BSS " MACSTR "@%s -> " 330 MACSTR "@%s", 331 MAC2STR(idata->src_hapd->own_addr), 332 idata->src_hapd->conf->iface, 333 MAC2STR(hapd->own_addr), hapd->conf->iface); 334 wpa_ft_rrb_rx(hapd->wpa_auth, 335 idata->src_hapd->own_addr, 336 idata->data, idata->data_len); 337 return 1; 338 } 339 } 340 341 return 0; 342} 343 344#endif /* CONFIG_IEEE80211R */ 345 346 347static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto, 348 const u8 *data, size_t data_len) 349{ 350 struct hostapd_data *hapd = ctx; 351 struct l2_ethhdr *buf; 352 int ret; 353 354#ifdef CONFIG_IEEE80211R 355 if (proto == ETH_P_RRB && hapd->iface->for_each_interface) { 356 int res; 357 struct wpa_auth_ft_iface_iter_data idata; 358 idata.src_hapd = hapd; 359 idata.dst = dst; 360 idata.data = data; 361 idata.data_len = data_len; 362 res = hapd->iface->for_each_interface(hapd->iface->interfaces, 363 hostapd_wpa_auth_ft_iter, 364 &idata); 365 if (res == 1) 366 return data_len; 367 } 368#endif /* CONFIG_IEEE80211R */ 369 370 if (hapd->driver && hapd->driver->send_ether) 371 return hapd->driver->send_ether(hapd->drv_priv, dst, 372 hapd->own_addr, proto, 373 data, data_len); 374 if (hapd->l2 == NULL) 375 return -1; 376 377 buf = os_malloc(sizeof(*buf) + data_len); 378 if (buf == NULL) 379 return -1; 380 os_memcpy(buf->h_dest, dst, ETH_ALEN); 381 os_memcpy(buf->h_source, hapd->own_addr, ETH_ALEN); 382 buf->h_proto = host_to_be16(proto); 383 os_memcpy(buf + 1, data, data_len); 384 ret = l2_packet_send(hapd->l2, dst, proto, (u8 *) buf, 385 sizeof(*buf) + data_len); 386 os_free(buf); 387 return -1; 388} 389 390 391#ifdef CONFIG_IEEE80211R 392 393static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst, 394 const u8 *data, size_t data_len) 395{ 396 struct hostapd_data *hapd = ctx; 397 int res; 398 struct ieee80211_mgmt *m; 399 size_t mlen; 400 struct sta_info *sta; 401 402 sta = ap_get_sta(hapd, dst); 403 if (sta == NULL || sta->wpa_sm == NULL) 404 return -1; 405 406 m = os_zalloc(sizeof(*m) + data_len); 407 if (m == NULL) 408 return -1; 409 mlen = ((u8 *) &m->u - (u8 *) m) + data_len; 410 m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 411 WLAN_FC_STYPE_ACTION); 412 os_memcpy(m->da, dst, ETH_ALEN); 413 os_memcpy(m->sa, hapd->own_addr, ETH_ALEN); 414 os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN); 415 os_memcpy(&m->u, data, data_len); 416 417 res = hostapd_drv_send_mlme(hapd, (u8 *) m, mlen); 418 os_free(m); 419 return res; 420} 421 422 423static struct wpa_state_machine * 424hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr) 425{ 426 struct hostapd_data *hapd = ctx; 427 struct sta_info *sta; 428 429 sta = ap_sta_add(hapd, sta_addr); 430 if (sta == NULL) 431 return NULL; 432 if (sta->wpa_sm) { 433 sta->auth_alg = WLAN_AUTH_FT; 434 return sta->wpa_sm; 435 } 436 437 sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr); 438 if (sta->wpa_sm == NULL) { 439 ap_free_sta(hapd, sta); 440 return NULL; 441 } 442 sta->auth_alg = WLAN_AUTH_FT; 443 444 return sta->wpa_sm; 445} 446 447 448static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf, 449 size_t len) 450{ 451 struct hostapd_data *hapd = ctx; 452 struct l2_ethhdr *ethhdr; 453 if (len < sizeof(*ethhdr)) 454 return; 455 ethhdr = (struct l2_ethhdr *) buf; 456 wpa_printf(MSG_DEBUG, "FT: RRB received packet " MACSTR " -> " 457 MACSTR, MAC2STR(ethhdr->h_source), MAC2STR(ethhdr->h_dest)); 458 wpa_ft_rrb_rx(hapd->wpa_auth, ethhdr->h_source, buf + sizeof(*ethhdr), 459 len - sizeof(*ethhdr)); 460} 461 462#endif /* CONFIG_IEEE80211R */ 463 464 465int hostapd_setup_wpa(struct hostapd_data *hapd) 466{ 467 struct wpa_auth_config _conf; 468 struct wpa_auth_callbacks cb; 469 const u8 *wpa_ie; 470 size_t wpa_ie_len; 471 472 hostapd_wpa_auth_conf(hapd->conf, &_conf); 473 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_EAPOL_TX_STATUS) 474 _conf.tx_status = 1; 475 os_memset(&cb, 0, sizeof(cb)); 476 cb.ctx = hapd; 477 cb.logger = hostapd_wpa_auth_logger; 478 cb.disconnect = hostapd_wpa_auth_disconnect; 479 cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report; 480 cb.set_eapol = hostapd_wpa_auth_set_eapol; 481 cb.get_eapol = hostapd_wpa_auth_get_eapol; 482 cb.get_psk = hostapd_wpa_auth_get_psk; 483 cb.get_msk = hostapd_wpa_auth_get_msk; 484 cb.set_key = hostapd_wpa_auth_set_key; 485 cb.get_seqnum = hostapd_wpa_auth_get_seqnum; 486 cb.send_eapol = hostapd_wpa_auth_send_eapol; 487 cb.for_each_sta = hostapd_wpa_auth_for_each_sta; 488 cb.for_each_auth = hostapd_wpa_auth_for_each_auth; 489 cb.send_ether = hostapd_wpa_auth_send_ether; 490#ifdef CONFIG_IEEE80211R 491 cb.send_ft_action = hostapd_wpa_auth_send_ft_action; 492 cb.add_sta = hostapd_wpa_auth_add_sta; 493#endif /* CONFIG_IEEE80211R */ 494 hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb); 495 if (hapd->wpa_auth == NULL) { 496 wpa_printf(MSG_ERROR, "WPA initialization failed."); 497 return -1; 498 } 499 500 if (hostapd_set_privacy(hapd, 1)) { 501 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked " 502 "for interface %s", hapd->conf->iface); 503 return -1; 504 } 505 506 wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len); 507 if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) { 508 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for " 509 "the kernel driver."); 510 return -1; 511 } 512 513 if (rsn_preauth_iface_init(hapd)) { 514 wpa_printf(MSG_ERROR, "Initialization of RSN " 515 "pre-authentication failed."); 516 return -1; 517 } 518 519#ifdef CONFIG_IEEE80211R 520 if (!hostapd_drv_none(hapd)) { 521 hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ? 522 hapd->conf->bridge : 523 hapd->conf->iface, NULL, ETH_P_RRB, 524 hostapd_rrb_receive, hapd, 1); 525 if (hapd->l2 == NULL && 526 (hapd->driver == NULL || 527 hapd->driver->send_ether == NULL)) { 528 wpa_printf(MSG_ERROR, "Failed to open l2_packet " 529 "interface"); 530 return -1; 531 } 532 } 533#endif /* CONFIG_IEEE80211R */ 534 535 return 0; 536 537} 538 539 540void hostapd_reconfig_wpa(struct hostapd_data *hapd) 541{ 542 struct wpa_auth_config wpa_auth_conf; 543 hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf); 544 wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf); 545} 546 547 548void hostapd_deinit_wpa(struct hostapd_data *hapd) 549{ 550 rsn_preauth_iface_deinit(hapd); 551 if (hapd->wpa_auth) { 552 wpa_deinit(hapd->wpa_auth); 553 hapd->wpa_auth = NULL; 554 555 if (hostapd_set_privacy(hapd, 0)) { 556 wpa_printf(MSG_DEBUG, "Could not disable " 557 "PrivacyInvoked for interface %s", 558 hapd->conf->iface); 559 } 560 561 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) { 562 wpa_printf(MSG_DEBUG, "Could not remove generic " 563 "information element from interface %s", 564 hapd->conf->iface); 565 } 566 } 567 ieee802_1x_deinit(hapd); 568 569#ifdef CONFIG_IEEE80211R 570 l2_packet_deinit(hapd->l2); 571#endif /* CONFIG_IEEE80211R */ 572} 573