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