src/ap/wpa_auth_glue.c

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