hostapd/wpa_auth_glue.c

   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 "ap/hostapd.h"
  24 #include "ap/ieee802_1x.h"
  25 #include "ap/preauth.h"
  26 #include "ap/sta_info.h"
  27 #include "ap/tkip_countermeasures.h"
  28 #include "ap/wpa.h"
  29 #include "driver_i.h"
  30
  31
  32 static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf,
  33                                   struct wpa_auth_config *wconf)
  34 {
  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->okc = conf->okc;
  49 #ifdef CONFIG_IEEE80211W
  50         wconf->ieee80211w = conf->ieee80211w;
  51 #endif /* CONFIG_IEEE80211W */
  52 #ifdef CONFIG_IEEE80211R
  53         wconf->ssid_len = conf->ssid.ssid_len;
  54         if (wconf->ssid_len > SSID_LEN)
  55                 wconf->ssid_len = SSID_LEN;
  56         os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len);
  57         os_memcpy(wconf->mobility_domain, conf->mobility_domain,
  58                   MOBILITY_DOMAIN_ID_LEN);
  59         if (conf->nas_identifier &&
  60             os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) {
  61                 wconf->r0_key_holder_len = os_strlen(conf->nas_identifier);
  62                 os_memcpy(wconf->r0_key_holder, conf->nas_identifier,
  63                           wconf->r0_key_holder_len);
  64         }
  65         os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN);
  66         wconf->r0_key_lifetime = conf->r0_key_lifetime;
  67         wconf->reassociation_deadline = conf->reassociation_deadline;
  68         wconf->r0kh_list = conf->r0kh_list;
  69         wconf->r1kh_list = conf->r1kh_list;
  70         wconf->pmk_r1_push = conf->pmk_r1_push;
  71 #endif /* CONFIG_IEEE80211R */
  72 }
  73
  74
  75 static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr,
  76                                     logger_level level, const char *txt)
  77 {
  78 #ifndef CONFIG_NO_HOSTAPD_LOGGER
  79         struct hostapd_data *hapd = ctx;
  80         int hlevel;
  81
  82         switch (level) {
  83         case LOGGER_WARNING:
  84                 hlevel = HOSTAPD_LEVEL_WARNING;
  85                 break;
  86         case LOGGER_INFO:
  87                 hlevel = HOSTAPD_LEVEL_INFO;
  88                 break;
  89         case LOGGER_DEBUG:
  90         default:
  91                 hlevel = HOSTAPD_LEVEL_DEBUG;
  92                 break;
  93         }
  94
  95         hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt);
  96 #endif /* CONFIG_NO_HOSTAPD_LOGGER */
  97 }
  98
  99
 100 static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr,
 101                                         u16 reason)
 102 {
 103         struct hostapd_data *hapd = ctx;
 104         wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: "
 105                    "STA " MACSTR " reason %d",
 106                    __func__, MAC2STR(addr), reason);
 107         ap_sta_disconnect(hapd, NULL, addr, reason);
 108 }
 109
 110
 111 static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr)
 112 {
 113         struct hostapd_data *hapd = ctx;
 114         michael_mic_failure(hapd, addr, 0);
 115 }
 116
 117
 118 static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr,
 119                                        wpa_eapol_variable var, int value)
 120 {
 121         struct hostapd_data *hapd = ctx;
 122         struct sta_info *sta = ap_get_sta(hapd, addr);
 123         if (sta == NULL)
 124                 return;
 125         switch (var) {
 126         case WPA_EAPOL_portEnabled:
 127                 ieee802_1x_notify_port_enabled(sta->eapol_sm, value);
 128                 break;
 129         case WPA_EAPOL_portValid:
 130                 ieee802_1x_notify_port_valid(sta->eapol_sm, value);
 131                 break;
 132         case WPA_EAPOL_authorized:
 133                 ieee802_1x_set_sta_authorized(hapd, sta, value);
 134                 break;
 135         case WPA_EAPOL_portControl_Auto:
 136                 if (sta->eapol_sm)
 137                         sta->eapol_sm->portControl = Auto;
 138                 break;
 139         case WPA_EAPOL_keyRun:
 140                 if (sta->eapol_sm)
 141                         sta->eapol_sm->keyRun = value ? TRUE : FALSE;
 142                 break;
 143         case WPA_EAPOL_keyAvailable:
 144                 if (sta->eapol_sm)
 145                         sta->eapol_sm->eap_if->eapKeyAvailable =
 146                                 value ? TRUE : FALSE;
 147                 break;
 148         case WPA_EAPOL_keyDone:
 149                 if (sta->eapol_sm)
 150                         sta->eapol_sm->keyDone = value ? TRUE : FALSE;
 151                 break;
 152         case WPA_EAPOL_inc_EapolFramesTx:
 153                 if (sta->eapol_sm)
 154                         sta->eapol_sm->dot1xAuthEapolFramesTx++;
 155                 break;
 156         }
 157 }
 158
 159
 160 static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr,
 161                                       wpa_eapol_variable var)
 162 {
 163         struct hostapd_data *hapd = ctx;
 164         struct sta_info *sta = ap_get_sta(hapd, addr);
 165         if (sta == NULL || sta->eapol_sm == NULL)
 166                 return -1;
 167         switch (var) {
 168         case WPA_EAPOL_keyRun:
 169                 return sta->eapol_sm->keyRun;
 170         case WPA_EAPOL_keyAvailable:
 171                 return sta->eapol_sm->eap_if->eapKeyAvailable;
 172         default:
 173                 return -1;
 174         }
 175 }
 176
 177
 178 static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr,
 179                                            const u8 *prev_psk)
 180 {
 181         struct hostapd_data *hapd = ctx;
 182         return hostapd_get_psk(hapd->conf, addr, prev_psk);
 183 }
 184
 185
 186 static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk,
 187                                     size_t *len)
 188 {
 189         struct hostapd_data *hapd = ctx;
 190         const u8 *key;
 191         size_t keylen;
 192         struct sta_info *sta;
 193
 194         sta = ap_get_sta(hapd, addr);
 195         if (sta == NULL)
 196                 return -1;
 197
 198         key = ieee802_1x_get_key(sta->eapol_sm, &keylen);
 199         if (key == NULL)
 200                 return -1;
 201
 202         if (keylen > *len)
 203                 keylen = *len;
 204         os_memcpy(msk, key, keylen);
 205         *len = keylen;
 206
 207         return 0;
 208 }
 209
 210
 211 static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, wpa_alg alg,
 212                                     const u8 *addr, int idx, u8 *key,
 213                                     size_t key_len)
 214 {
 215         struct hostapd_data *hapd = ctx;
 216         const char *ifname = hapd->conf->iface;
 217
 218         if (vlan_id > 0) {
 219                 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id);
 220                 if (ifname == NULL)
 221                         return -1;
 222         }
 223
 224         return hapd->drv.set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0,
 225                                  key, key_len);
 226 }
 227
 228
 229 static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx,
 230                                        u8 *seq)
 231 {
 232         struct hostapd_data *hapd = ctx;
 233         return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq);
 234 }
 235
 236
 237 static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr,
 238                                        const u8 *data, size_t data_len,
 239                                        int encrypt)
 240 {
 241         struct hostapd_data *hapd = ctx;
 242         return hapd->drv.send_eapol(hapd, addr, data, data_len, encrypt);
 243 }
 244
 245
 246 static int hostapd_wpa_auth_for_each_sta(
 247         void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx),
 248         void *cb_ctx)
 249 {
 250         struct hostapd_data *hapd = ctx;
 251         struct sta_info *sta;
 252
 253         for (sta = hapd->sta_list; sta; sta = sta->next) {
 254                 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx))
 255                         return 1;
 256         }
 257         return 0;
 258 }
 259
 260
 261 struct wpa_auth_iface_iter_data {
 262         int (*cb)(struct wpa_authenticator *sm, void *ctx);
 263         void *cb_ctx;
 264 };
 265
 266 static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx)
 267 {
 268         struct wpa_auth_iface_iter_data *data = ctx;
 269         size_t i;
 270         for (i = 0; i < iface->num_bss; i++) {
 271                 if (data->cb(iface->bss[i]->wpa_auth, data->cb_ctx))
 272                         return 1;
 273         }
 274         return 0;
 275 }
 276
 277
 278 static int hostapd_wpa_auth_for_each_auth(
 279         void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx),
 280         void *cb_ctx)
 281 {
 282         struct hostapd_data *hapd = ctx;
 283         struct wpa_auth_iface_iter_data data;
 284         data.cb = cb;
 285         data.cb_ctx = cb_ctx;
 286         return hostapd_for_each_interface(hapd->iface->interfaces,
 287                                           wpa_auth_iface_iter, &data);
 288 }
 289
 290
 291 static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto,
 292                                        const u8 *data, size_t data_len)
 293 {
 294         struct hostapd_data *hapd = ctx;
 295
 296         if (hapd->driver && hapd->driver->send_ether)
 297                 return hapd->driver->send_ether(hapd->drv_priv, dst,
 298                                                 hapd->own_addr, proto,
 299                                                 data, data_len);
 300         if (hapd->l2 == NULL)
 301                 return -1;
 302         return l2_packet_send(hapd->l2, dst, proto, data, data_len);
 303 }
 304
 305
 306 #ifdef CONFIG_IEEE80211R
 307
 308 static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst,
 309                                            const u8 *data, size_t data_len)
 310 {
 311         struct hostapd_data *hapd = ctx;
 312         int res;
 313         struct ieee80211_mgmt *m;
 314         size_t mlen;
 315         struct sta_info *sta;
 316
 317         sta = ap_get_sta(hapd, dst);
 318         if (sta == NULL || sta->wpa_sm == NULL)
 319                 return -1;
 320
 321         m = os_zalloc(sizeof(*m) + data_len);
 322         if (m == NULL)
 323                 return -1;
 324         mlen = ((u8 *) &m->u - (u8 *) m) + data_len;
 325         m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 326                                         WLAN_FC_STYPE_ACTION);
 327         os_memcpy(m->da, dst, ETH_ALEN);
 328         os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
 329         os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
 330         os_memcpy(&m->u, data, data_len);
 331
 332         res = hapd->drv.send_mgmt_frame(hapd, (u8 *) m, mlen);
 333         os_free(m);
 334         return res;
 335 }
 336
 337
 338 static struct wpa_state_machine *
 339 hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr)
 340 {
 341         struct hostapd_data *hapd = ctx;
 342         struct sta_info *sta;
 343
 344         sta = ap_sta_add(hapd, sta_addr);
 345         if (sta == NULL)
 346                 return NULL;
 347         if (sta->wpa_sm)
 348                 return sta->wpa_sm;
 349
 350         sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr);
 351         if (sta->wpa_sm == NULL) {
 352                 ap_free_sta(hapd, sta);
 353                 return NULL;
 354         }
 355         sta->auth_alg = WLAN_AUTH_FT;
 356
 357         return sta->wpa_sm;
 358 }
 359
 360
 361 static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf,
 362                                 size_t len)
 363 {
 364         struct hostapd_data *hapd = ctx;
 365         wpa_ft_rrb_rx(hapd->wpa_auth, src_addr, buf, len);
 366 }
 367
 368 #endif /* CONFIG_IEEE80211R */
 369
 370
 371 int hostapd_setup_wpa(struct hostapd_data *hapd)
 372 {
 373         struct wpa_auth_config _conf;
 374         struct wpa_auth_callbacks cb;
 375         const u8 *wpa_ie;
 376         size_t wpa_ie_len;
 377
 378         hostapd_wpa_auth_conf(hapd->conf, &_conf);
 379         os_memset(&cb, 0, sizeof(cb));
 380         cb.ctx = hapd;
 381         cb.logger = hostapd_wpa_auth_logger;
 382         cb.disconnect = hostapd_wpa_auth_disconnect;
 383         cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report;
 384         cb.set_eapol = hostapd_wpa_auth_set_eapol;
 385         cb.get_eapol = hostapd_wpa_auth_get_eapol;
 386         cb.get_psk = hostapd_wpa_auth_get_psk;
 387         cb.get_msk = hostapd_wpa_auth_get_msk;
 388         cb.set_key = hostapd_wpa_auth_set_key;
 389         cb.get_seqnum = hostapd_wpa_auth_get_seqnum;
 390         cb.send_eapol = hostapd_wpa_auth_send_eapol;
 391         cb.for_each_sta = hostapd_wpa_auth_for_each_sta;
 392         cb.for_each_auth = hostapd_wpa_auth_for_each_auth;
 393         cb.send_ether = hostapd_wpa_auth_send_ether;
 394 #ifdef CONFIG_IEEE80211R
 395         cb.send_ft_action = hostapd_wpa_auth_send_ft_action;
 396         cb.add_sta = hostapd_wpa_auth_add_sta;
 397 #endif /* CONFIG_IEEE80211R */
 398         hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb);
 399         if (hapd->wpa_auth == NULL) {
 400                 wpa_printf(MSG_ERROR, "WPA initialization failed.");
 401                 return -1;
 402         }
 403
 404         if (hostapd_set_privacy(hapd, 1)) {
 405                 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked "
 406                            "for interface %s", hapd->conf->iface);
 407                 return -1;
 408         }
 409
 410         wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len);
 411         if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) {
 412                 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for "
 413                            "the kernel driver.");
 414                 return -1;
 415         }
 416
 417         if (rsn_preauth_iface_init(hapd)) {
 418                 wpa_printf(MSG_ERROR, "Initialization of RSN "
 419                            "pre-authentication failed.");
 420                 return -1;
 421         }
 422
 423 #ifdef CONFIG_IEEE80211R
 424         if (!hostapd_drv_none(hapd)) {
 425                 hapd->l2 = l2_packet_init(hapd->conf->iface, NULL, ETH_P_RRB,
 426                                           hostapd_rrb_receive, hapd, 0);
 427                 if (hapd->l2 == NULL &&
 428                     (hapd->driver == NULL ||
 429                      hapd->driver->send_ether == NULL)) {
 430                         wpa_printf(MSG_ERROR, "Failed to open l2_packet "
 431                                    "interface");
 432                         return -1;
 433                 }
 434         }
 435 #endif /* CONFIG_IEEE80211R */
 436
 437         return 0;
 438
 439 }
 440
 441
 442 void hostapd_reconfig_wpa(struct hostapd_data *hapd)
 443 {
 444         struct wpa_auth_config wpa_auth_conf;
 445         hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf);
 446         wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf);
 447 }
 448
 449
 450 void hostapd_deinit_wpa(struct hostapd_data *hapd)
 451 {
 452         rsn_preauth_iface_deinit(hapd);
 453         if (hapd->wpa_auth) {
 454                 wpa_deinit(hapd->wpa_auth);
 455                 hapd->wpa_auth = NULL;
 456
 457                 if (hostapd_set_privacy(hapd, 0)) {
 458                         wpa_printf(MSG_DEBUG, "Could not disable "
 459                                    "PrivacyInvoked for interface %s",
 460                                    hapd->conf->iface);
 461                 }
 462
 463                 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) {
 464                         wpa_printf(MSG_DEBUG, "Could not remove generic "
 465                                    "information element from interface %s",
 466                                    hapd->conf->iface);
 467                 }
 468         }
 469         ieee802_1x_deinit(hapd);
 470
 471 #ifdef CONFIG_IEEE80211R
 472         l2_packet_deinit(hapd->l2);
 473 #endif /* CONFIG_IEEE80211R */
 474 }