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 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->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
  80 static 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
 105 static 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
 116 static 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
 123 static 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
 165 static 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
 183 static 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
 191 static 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
 216 static 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
 234 static 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
 242 static 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
 259 static 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
 274 struct wpa_auth_iface_iter_data {
 275         int (*cb)(struct wpa_authenticator *sm, void *ctx);
 276         void *cb_ctx;
 277 };
 278
 279 static 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
 292 static 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
 309 struct 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
 317 static 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
 347 static 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 ret;
 388 }
 389
 390
 391 #ifdef CONFIG_IEEE80211R
 392
 393 static 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
 423 static struct wpa_state_machine *
 424 hostapd_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
 448 static 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
 465 int 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
 540 void 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
 548 void 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 }