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 #ifdef CONFIG_HS20
  74         wconf->disable_gtk = conf->disable_dgaf;
  75 #endif /* CONFIG_HS20 */
  76 }
  77
  78
  79 static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr,
  80                                     logger_level level, const char *txt)
  81 {
  82 #ifndef CONFIG_NO_HOSTAPD_LOGGER
  83         struct hostapd_data *hapd = ctx;
  84         int hlevel;
  85
  86         switch (level) {
  87         case LOGGER_WARNING:
  88                 hlevel = HOSTAPD_LEVEL_WARNING;
  89                 break;
  90         case LOGGER_INFO:
  91                 hlevel = HOSTAPD_LEVEL_INFO;
  92                 break;
  93         case LOGGER_DEBUG:
  94         default:
  95                 hlevel = HOSTAPD_LEVEL_DEBUG;
  96                 break;
  97         }
  98
  99         hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt);
 100 #endif /* CONFIG_NO_HOSTAPD_LOGGER */
 101 }
 102
 103
 104 static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr,
 105                                         u16 reason)
 106 {
 107         struct hostapd_data *hapd = ctx;
 108         wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: "
 109                    "STA " MACSTR " reason %d",
 110                    __func__, MAC2STR(addr), reason);
 111         ap_sta_disconnect(hapd, NULL, addr, reason);
 112 }
 113
 114
 115 static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr)
 116 {
 117         struct hostapd_data *hapd = ctx;
 118         michael_mic_failure(hapd, addr, 0);
 119 }
 120
 121
 122 static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr,
 123                                        wpa_eapol_variable var, int value)
 124 {
 125         struct hostapd_data *hapd = ctx;
 126         struct sta_info *sta = ap_get_sta(hapd, addr);
 127         if (sta == NULL)
 128                 return;
 129         switch (var) {
 130         case WPA_EAPOL_portEnabled:
 131                 ieee802_1x_notify_port_enabled(sta->eapol_sm, value);
 132                 break;
 133         case WPA_EAPOL_portValid:
 134                 ieee802_1x_notify_port_valid(sta->eapol_sm, value);
 135                 break;
 136         case WPA_EAPOL_authorized:
 137                 ieee802_1x_set_sta_authorized(hapd, sta, value);
 138                 break;
 139         case WPA_EAPOL_portControl_Auto:
 140                 if (sta->eapol_sm)
 141                         sta->eapol_sm->portControl = Auto;
 142                 break;
 143         case WPA_EAPOL_keyRun:
 144                 if (sta->eapol_sm)
 145                         sta->eapol_sm->keyRun = value ? TRUE : FALSE;
 146                 break;
 147         case WPA_EAPOL_keyAvailable:
 148                 if (sta->eapol_sm)
 149                         sta->eapol_sm->eap_if->eapKeyAvailable =
 150                                 value ? TRUE : FALSE;
 151                 break;
 152         case WPA_EAPOL_keyDone:
 153                 if (sta->eapol_sm)
 154                         sta->eapol_sm->keyDone = value ? TRUE : FALSE;
 155                 break;
 156         case WPA_EAPOL_inc_EapolFramesTx:
 157                 if (sta->eapol_sm)
 158                         sta->eapol_sm->dot1xAuthEapolFramesTx++;
 159                 break;
 160         }
 161 }
 162
 163
 164 static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr,
 165                                       wpa_eapol_variable var)
 166 {
 167         struct hostapd_data *hapd = ctx;
 168         struct sta_info *sta = ap_get_sta(hapd, addr);
 169         if (sta == NULL || sta->eapol_sm == NULL)
 170                 return -1;
 171         switch (var) {
 172         case WPA_EAPOL_keyRun:
 173                 return sta->eapol_sm->keyRun;
 174         case WPA_EAPOL_keyAvailable:
 175                 return sta->eapol_sm->eap_if->eapKeyAvailable;
 176         default:
 177                 return -1;
 178         }
 179 }
 180
 181
 182 static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr,
 183                                            const u8 *prev_psk)
 184 {
 185         struct hostapd_data *hapd = ctx;
 186         struct sta_info *sta = ap_get_sta(hapd, addr);
 187         if (sta && sta->psk)
 188                 return sta->psk;
 189         return hostapd_get_psk(hapd->conf, addr, prev_psk);
 190 }
 191
 192
 193 static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk,
 194                                     size_t *len)
 195 {
 196         struct hostapd_data *hapd = ctx;
 197         const u8 *key;
 198         size_t keylen;
 199         struct sta_info *sta;
 200
 201         sta = ap_get_sta(hapd, addr);
 202         if (sta == NULL)
 203                 return -1;
 204
 205         key = ieee802_1x_get_key(sta->eapol_sm, &keylen);
 206         if (key == NULL)
 207                 return -1;
 208
 209         if (keylen > *len)
 210                 keylen = *len;
 211         os_memcpy(msk, key, keylen);
 212         *len = keylen;
 213
 214         return 0;
 215 }
 216
 217
 218 static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 219                                     const u8 *addr, int idx, u8 *key,
 220                                     size_t key_len)
 221 {
 222         struct hostapd_data *hapd = ctx;
 223         const char *ifname = hapd->conf->iface;
 224
 225         if (vlan_id > 0) {
 226                 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id);
 227                 if (ifname == NULL)
 228                         return -1;
 229         }
 230
 231         return hostapd_drv_set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0,
 232                                    key, key_len);
 233 }
 234
 235
 236 static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx,
 237                                        u8 *seq)
 238 {
 239         struct hostapd_data *hapd = ctx;
 240         return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq);
 241 }
 242
 243
 244 static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr,
 245                                        const u8 *data, size_t data_len,
 246                                        int encrypt)
 247 {
 248         struct hostapd_data *hapd = ctx;
 249         struct sta_info *sta;
 250         u32 flags = 0;
 251
 252         sta = ap_get_sta(hapd, addr);
 253         if (sta)
 254                 flags = hostapd_sta_flags_to_drv(sta->flags);
 255
 256         return hostapd_drv_hapd_send_eapol(hapd, addr, data, data_len,
 257                                            encrypt, flags);
 258 }
 259
 260
 261 static int hostapd_wpa_auth_for_each_sta(
 262         void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx),
 263         void *cb_ctx)
 264 {
 265         struct hostapd_data *hapd = ctx;
 266         struct sta_info *sta;
 267
 268         for (sta = hapd->sta_list; sta; sta = sta->next) {
 269                 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx))
 270                         return 1;
 271         }
 272         return 0;
 273 }
 274
 275
 276 struct wpa_auth_iface_iter_data {
 277         int (*cb)(struct wpa_authenticator *sm, void *ctx);
 278         void *cb_ctx;
 279 };
 280
 281 static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx)
 282 {
 283         struct wpa_auth_iface_iter_data *data = ctx;
 284         size_t i;
 285         for (i = 0; i < iface->num_bss; i++) {
 286                 if (iface->bss[i]->wpa_auth &&
 287                     data->cb(iface->bss[i]->wpa_auth, data->cb_ctx))
 288                         return 1;
 289         }
 290         return 0;
 291 }
 292
 293
 294 static int hostapd_wpa_auth_for_each_auth(
 295         void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx),
 296         void *cb_ctx)
 297 {
 298         struct hostapd_data *hapd = ctx;
 299         struct wpa_auth_iface_iter_data data;
 300         if (hapd->iface->for_each_interface == NULL)
 301                 return -1;
 302         data.cb = cb;
 303         data.cb_ctx = cb_ctx;
 304         return hapd->iface->for_each_interface(hapd->iface->interfaces,
 305                                                wpa_auth_iface_iter, &data);
 306 }
 307
 308
 309 #ifdef CONFIG_IEEE80211R
 310
 311 struct wpa_auth_ft_iface_iter_data {
 312         struct hostapd_data *src_hapd;
 313         const u8 *dst;
 314         const u8 *data;
 315         size_t data_len;
 316 };
 317
 318
 319 static int hostapd_wpa_auth_ft_iter(struct hostapd_iface *iface, void *ctx)
 320 {
 321         struct wpa_auth_ft_iface_iter_data *idata = ctx;
 322         struct hostapd_data *hapd;
 323         size_t j;
 324
 325         for (j = 0; j < iface->num_bss; j++) {
 326                 hapd = iface->bss[j];
 327                 if (hapd == idata->src_hapd)
 328                         continue;
 329                 if (os_memcmp(hapd->own_addr, idata->dst, ETH_ALEN) == 0) {
 330                         wpa_printf(MSG_DEBUG, "FT: Send RRB data directly to "
 331                                    "locally managed BSS " MACSTR "@%s -> "
 332                                    MACSTR "@%s",
 333                                    MAC2STR(idata->src_hapd->own_addr),
 334                                    idata->src_hapd->conf->iface,
 335                                    MAC2STR(hapd->own_addr), hapd->conf->iface);
 336                         wpa_ft_rrb_rx(hapd->wpa_auth,
 337                                       idata->src_hapd->own_addr,
 338                                       idata->data, idata->data_len);
 339                         return 1;
 340                 }
 341         }
 342
 343         return 0;
 344 }
 345
 346 #endif /* CONFIG_IEEE80211R */
 347
 348
 349 static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto,
 350                                        const u8 *data, size_t data_len)
 351 {
 352         struct hostapd_data *hapd = ctx;
 353         struct l2_ethhdr *buf;
 354         int ret;
 355
 356 #ifdef CONFIG_IEEE80211R
 357         if (proto == ETH_P_RRB && hapd->iface->for_each_interface) {
 358                 int res;
 359                 struct wpa_auth_ft_iface_iter_data idata;
 360                 idata.src_hapd = hapd;
 361                 idata.dst = dst;
 362                 idata.data = data;
 363                 idata.data_len = data_len;
 364                 res = hapd->iface->for_each_interface(hapd->iface->interfaces,
 365                                                       hostapd_wpa_auth_ft_iter,
 366                                                       &idata);
 367                 if (res == 1)
 368                         return data_len;
 369         }
 370 #endif /* CONFIG_IEEE80211R */
 371
 372         if (hapd->driver && hapd->driver->send_ether)
 373                 return hapd->driver->send_ether(hapd->drv_priv, dst,
 374                                                 hapd->own_addr, proto,
 375                                                 data, data_len);
 376         if (hapd->l2 == NULL)
 377                 return -1;
 378
 379         buf = os_malloc(sizeof(*buf) + data_len);
 380         if (buf == NULL)
 381                 return -1;
 382         os_memcpy(buf->h_dest, dst, ETH_ALEN);
 383         os_memcpy(buf->h_source, hapd->own_addr, ETH_ALEN);
 384         buf->h_proto = host_to_be16(proto);
 385         os_memcpy(buf + 1, data, data_len);
 386         ret = l2_packet_send(hapd->l2, dst, proto, (u8 *) buf,
 387                              sizeof(*buf) + data_len);
 388         os_free(buf);
 389         return ret;
 390 }
 391
 392
 393 #ifdef CONFIG_IEEE80211R
 394
 395 static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst,
 396                                            const u8 *data, size_t data_len)
 397 {
 398         struct hostapd_data *hapd = ctx;
 399         int res;
 400         struct ieee80211_mgmt *m;
 401         size_t mlen;
 402         struct sta_info *sta;
 403
 404         sta = ap_get_sta(hapd, dst);
 405         if (sta == NULL || sta->wpa_sm == NULL)
 406                 return -1;
 407
 408         m = os_zalloc(sizeof(*m) + data_len);
 409         if (m == NULL)
 410                 return -1;
 411         mlen = ((u8 *) &m->u - (u8 *) m) + data_len;
 412         m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 413                                         WLAN_FC_STYPE_ACTION);
 414         os_memcpy(m->da, dst, ETH_ALEN);
 415         os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
 416         os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
 417         os_memcpy(&m->u, data, data_len);
 418
 419         res = hostapd_drv_send_mlme(hapd, (u8 *) m, mlen, 0);
 420         os_free(m);
 421         return res;
 422 }
 423
 424
 425 static struct wpa_state_machine *
 426 hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr)
 427 {
 428         struct hostapd_data *hapd = ctx;
 429         struct sta_info *sta;
 430
 431         sta = ap_sta_add(hapd, sta_addr);
 432         if (sta == NULL)
 433                 return NULL;
 434         if (sta->wpa_sm) {
 435                 sta->auth_alg = WLAN_AUTH_FT;
 436                 return sta->wpa_sm;
 437         }
 438
 439         sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr);
 440         if (sta->wpa_sm == NULL) {
 441                 ap_free_sta(hapd, sta);
 442                 return NULL;
 443         }
 444         sta->auth_alg = WLAN_AUTH_FT;
 445
 446         return sta->wpa_sm;
 447 }
 448
 449
 450 static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf,
 451                                 size_t len)
 452 {
 453         struct hostapd_data *hapd = ctx;
 454         struct l2_ethhdr *ethhdr;
 455         if (len < sizeof(*ethhdr))
 456                 return;
 457         ethhdr = (struct l2_ethhdr *) buf;
 458         wpa_printf(MSG_DEBUG, "FT: RRB received packet " MACSTR " -> "
 459                    MACSTR, MAC2STR(ethhdr->h_source), MAC2STR(ethhdr->h_dest));
 460         wpa_ft_rrb_rx(hapd->wpa_auth, ethhdr->h_source, buf + sizeof(*ethhdr),
 461                       len - sizeof(*ethhdr));
 462 }
 463
 464 #endif /* CONFIG_IEEE80211R */
 465
 466
 467 int hostapd_setup_wpa(struct hostapd_data *hapd)
 468 {
 469         struct wpa_auth_config _conf;
 470         struct wpa_auth_callbacks cb;
 471         const u8 *wpa_ie;
 472         size_t wpa_ie_len;
 473
 474         hostapd_wpa_auth_conf(hapd->conf, &_conf);
 475         if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_EAPOL_TX_STATUS)
 476                 _conf.tx_status = 1;
 477         os_memset(&cb, 0, sizeof(cb));
 478         cb.ctx = hapd;
 479         cb.logger = hostapd_wpa_auth_logger;
 480         cb.disconnect = hostapd_wpa_auth_disconnect;
 481         cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report;
 482         cb.set_eapol = hostapd_wpa_auth_set_eapol;
 483         cb.get_eapol = hostapd_wpa_auth_get_eapol;
 484         cb.get_psk = hostapd_wpa_auth_get_psk;
 485         cb.get_msk = hostapd_wpa_auth_get_msk;
 486         cb.set_key = hostapd_wpa_auth_set_key;
 487         cb.get_seqnum = hostapd_wpa_auth_get_seqnum;
 488         cb.send_eapol = hostapd_wpa_auth_send_eapol;
 489         cb.for_each_sta = hostapd_wpa_auth_for_each_sta;
 490         cb.for_each_auth = hostapd_wpa_auth_for_each_auth;
 491         cb.send_ether = hostapd_wpa_auth_send_ether;
 492 #ifdef CONFIG_IEEE80211R
 493         cb.send_ft_action = hostapd_wpa_auth_send_ft_action;
 494         cb.add_sta = hostapd_wpa_auth_add_sta;
 495 #endif /* CONFIG_IEEE80211R */
 496         hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb);
 497         if (hapd->wpa_auth == NULL) {
 498                 wpa_printf(MSG_ERROR, "WPA initialization failed.");
 499                 return -1;
 500         }
 501
 502         if (hostapd_set_privacy(hapd, 1)) {
 503                 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked "
 504                            "for interface %s", hapd->conf->iface);
 505                 return -1;
 506         }
 507
 508         wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len);
 509         if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) {
 510                 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for "
 511                            "the kernel driver.");
 512                 return -1;
 513         }
 514
 515         if (rsn_preauth_iface_init(hapd)) {
 516                 wpa_printf(MSG_ERROR, "Initialization of RSN "
 517                            "pre-authentication failed.");
 518                 return -1;
 519         }
 520
 521 #ifdef CONFIG_IEEE80211R
 522         if (!hostapd_drv_none(hapd)) {
 523                 hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ?
 524                                           hapd->conf->bridge :
 525                                           hapd->conf->iface, NULL, ETH_P_RRB,
 526                                           hostapd_rrb_receive, hapd, 1);
 527                 if (hapd->l2 == NULL &&
 528                     (hapd->driver == NULL ||
 529                      hapd->driver->send_ether == NULL)) {
 530                         wpa_printf(MSG_ERROR, "Failed to open l2_packet "
 531                                    "interface");
 532                         return -1;
 533                 }
 534         }
 535 #endif /* CONFIG_IEEE80211R */
 536
 537         return 0;
 538
 539 }
 540
 541
 542 void hostapd_reconfig_wpa(struct hostapd_data *hapd)
 543 {
 544         struct wpa_auth_config wpa_auth_conf;
 545         hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf);
 546         wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf);
 547 }
 548
 549
 550 void hostapd_deinit_wpa(struct hostapd_data *hapd)
 551 {
 552         ieee80211_tkip_countermeasures_deinit(hapd);
 553         rsn_preauth_iface_deinit(hapd);
 554         if (hapd->wpa_auth) {
 555                 wpa_deinit(hapd->wpa_auth);
 556                 hapd->wpa_auth = NULL;
 557
 558                 if (hostapd_set_privacy(hapd, 0)) {
 559                         wpa_printf(MSG_DEBUG, "Could not disable "
 560                                    "PrivacyInvoked for interface %s",
 561                                    hapd->conf->iface);
 562                 }
 563
 564                 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) {
 565                         wpa_printf(MSG_DEBUG, "Could not remove generic "
 566                                    "information element from interface %s",
 567                                    hapd->conf->iface);
 568                 }
 569         }
 570         ieee802_1x_deinit(hapd);
 571
 572 #ifdef CONFIG_IEEE80211R
 573         l2_packet_deinit(hapd->l2);
 574 #endif /* CONFIG_IEEE80211R */
 575 }