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 #include "wpa_auth_glue.h"
  33
  34
  35 static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf,
  36                                   struct wpa_auth_config *wconf)
  37 {
  38         os_memset(wconf, 0, sizeof(*wconf));
  39         wconf->wpa = conf->wpa;
  40         wconf->wpa_key_mgmt = conf->wpa_key_mgmt;
  41         wconf->wpa_pairwise = conf->wpa_pairwise;
  42         wconf->wpa_group = conf->wpa_group;
  43         wconf->wpa_group_rekey = conf->wpa_group_rekey;
  44         wconf->wpa_strict_rekey = conf->wpa_strict_rekey;
  45         wconf->wpa_gmk_rekey = conf->wpa_gmk_rekey;
  46         wconf->wpa_ptk_rekey = conf->wpa_ptk_rekey;
  47         wconf->rsn_pairwise = conf->rsn_pairwise;
  48         wconf->rsn_preauth = conf->rsn_preauth;
  49         wconf->eapol_version = conf->eapol_version;
  50         wconf->peerkey = conf->peerkey;
  51         wconf->wmm_enabled = conf->wmm_enabled;
  52         wconf->wmm_uapsd = conf->wmm_uapsd;
  53         wconf->disable_pmksa_caching = conf->disable_pmksa_caching;
  54         wconf->okc = conf->okc;
  55 #ifdef CONFIG_IEEE80211W
  56         wconf->ieee80211w = conf->ieee80211w;
  57 #endif /* CONFIG_IEEE80211W */
  58 #ifdef CONFIG_IEEE80211R
  59         wconf->ssid_len = conf->ssid.ssid_len;
  60         if (wconf->ssid_len > SSID_LEN)
  61                 wconf->ssid_len = SSID_LEN;
  62         os_memcpy(wconf->ssid, conf->ssid.ssid, wconf->ssid_len);
  63         os_memcpy(wconf->mobility_domain, conf->mobility_domain,
  64                   MOBILITY_DOMAIN_ID_LEN);
  65         if (conf->nas_identifier &&
  66             os_strlen(conf->nas_identifier) <= FT_R0KH_ID_MAX_LEN) {
  67                 wconf->r0_key_holder_len = os_strlen(conf->nas_identifier);
  68                 os_memcpy(wconf->r0_key_holder, conf->nas_identifier,
  69                           wconf->r0_key_holder_len);
  70         }
  71         os_memcpy(wconf->r1_key_holder, conf->r1_key_holder, FT_R1KH_ID_LEN);
  72         wconf->r0_key_lifetime = conf->r0_key_lifetime;
  73         wconf->reassociation_deadline = conf->reassociation_deadline;
  74         wconf->r0kh_list = conf->r0kh_list;
  75         wconf->r1kh_list = conf->r1kh_list;
  76         wconf->pmk_r1_push = conf->pmk_r1_push;
  77         wconf->ft_over_ds = conf->ft_over_ds;
  78 #endif /* CONFIG_IEEE80211R */
  79 }
  80
  81
  82 static void hostapd_wpa_auth_logger(void *ctx, const u8 *addr,
  83                                     logger_level level, const char *txt)
  84 {
  85 #ifndef CONFIG_NO_HOSTAPD_LOGGER
  86         struct hostapd_data *hapd = ctx;
  87         int hlevel;
  88
  89         switch (level) {
  90         case LOGGER_WARNING:
  91                 hlevel = HOSTAPD_LEVEL_WARNING;
  92                 break;
  93         case LOGGER_INFO:
  94                 hlevel = HOSTAPD_LEVEL_INFO;
  95                 break;
  96         case LOGGER_DEBUG:
  97         default:
  98                 hlevel = HOSTAPD_LEVEL_DEBUG;
  99                 break;
 100         }
 101
 102         hostapd_logger(hapd, addr, HOSTAPD_MODULE_WPA, hlevel, "%s", txt);
 103 #endif /* CONFIG_NO_HOSTAPD_LOGGER */
 104 }
 105
 106
 107 static void hostapd_wpa_auth_disconnect(void *ctx, const u8 *addr,
 108                                         u16 reason)
 109 {
 110         struct hostapd_data *hapd = ctx;
 111         wpa_printf(MSG_DEBUG, "%s: WPA authenticator requests disconnect: "
 112                    "STA " MACSTR " reason %d",
 113                    __func__, MAC2STR(addr), reason);
 114         ap_sta_disconnect(hapd, NULL, addr, reason);
 115 }
 116
 117
 118 static void hostapd_wpa_auth_mic_failure_report(void *ctx, const u8 *addr)
 119 {
 120         struct hostapd_data *hapd = ctx;
 121         michael_mic_failure(hapd, addr, 0);
 122 }
 123
 124
 125 static void hostapd_wpa_auth_set_eapol(void *ctx, const u8 *addr,
 126                                        wpa_eapol_variable var, int value)
 127 {
 128         struct hostapd_data *hapd = ctx;
 129         struct sta_info *sta = ap_get_sta(hapd, addr);
 130         if (sta == NULL)
 131                 return;
 132         switch (var) {
 133         case WPA_EAPOL_portEnabled:
 134                 ieee802_1x_notify_port_enabled(sta->eapol_sm, value);
 135                 break;
 136         case WPA_EAPOL_portValid:
 137                 ieee802_1x_notify_port_valid(sta->eapol_sm, value);
 138                 break;
 139         case WPA_EAPOL_authorized:
 140                 ieee802_1x_set_sta_authorized(hapd, sta, value);
 141                 break;
 142         case WPA_EAPOL_portControl_Auto:
 143                 if (sta->eapol_sm)
 144                         sta->eapol_sm->portControl = Auto;
 145                 break;
 146         case WPA_EAPOL_keyRun:
 147                 if (sta->eapol_sm)
 148                         sta->eapol_sm->keyRun = value ? TRUE : FALSE;
 149                 break;
 150         case WPA_EAPOL_keyAvailable:
 151                 if (sta->eapol_sm)
 152                         sta->eapol_sm->eap_if->eapKeyAvailable =
 153                                 value ? TRUE : FALSE;
 154                 break;
 155         case WPA_EAPOL_keyDone:
 156                 if (sta->eapol_sm)
 157                         sta->eapol_sm->keyDone = value ? TRUE : FALSE;
 158                 break;
 159         case WPA_EAPOL_inc_EapolFramesTx:
 160                 if (sta->eapol_sm)
 161                         sta->eapol_sm->dot1xAuthEapolFramesTx++;
 162                 break;
 163         }
 164 }
 165
 166
 167 static int hostapd_wpa_auth_get_eapol(void *ctx, const u8 *addr,
 168                                       wpa_eapol_variable var)
 169 {
 170         struct hostapd_data *hapd = ctx;
 171         struct sta_info *sta = ap_get_sta(hapd, addr);
 172         if (sta == NULL || sta->eapol_sm == NULL)
 173                 return -1;
 174         switch (var) {
 175         case WPA_EAPOL_keyRun:
 176                 return sta->eapol_sm->keyRun;
 177         case WPA_EAPOL_keyAvailable:
 178                 return sta->eapol_sm->eap_if->eapKeyAvailable;
 179         default:
 180                 return -1;
 181         }
 182 }
 183
 184
 185 static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr,
 186                                            const u8 *prev_psk)
 187 {
 188         struct hostapd_data *hapd = ctx;
 189         struct sta_info *sta = ap_get_sta(hapd, addr);
 190         if (sta && sta->psk)
 191                 return sta->psk;
 192         return hostapd_get_psk(hapd->conf, addr, prev_psk);
 193 }
 194
 195
 196 static int hostapd_wpa_auth_get_msk(void *ctx, const u8 *addr, u8 *msk,
 197                                     size_t *len)
 198 {
 199         struct hostapd_data *hapd = ctx;
 200         const u8 *key;
 201         size_t keylen;
 202         struct sta_info *sta;
 203
 204         sta = ap_get_sta(hapd, addr);
 205         if (sta == NULL)
 206                 return -1;
 207
 208         key = ieee802_1x_get_key(sta->eapol_sm, &keylen);
 209         if (key == NULL)
 210                 return -1;
 211
 212         if (keylen > *len)
 213                 keylen = *len;
 214         os_memcpy(msk, key, keylen);
 215         *len = keylen;
 216
 217         return 0;
 218 }
 219
 220
 221 static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 222                                     const u8 *addr, int idx, u8 *key,
 223                                     size_t key_len)
 224 {
 225         struct hostapd_data *hapd = ctx;
 226         const char *ifname = hapd->conf->iface;
 227
 228         if (vlan_id > 0) {
 229                 ifname = hostapd_get_vlan_id_ifname(hapd->conf->vlan, vlan_id);
 230                 if (ifname == NULL)
 231                         return -1;
 232         }
 233
 234         return hostapd_drv_set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0,
 235                                    key, key_len);
 236 }
 237
 238
 239 static int hostapd_wpa_auth_get_seqnum(void *ctx, const u8 *addr, int idx,
 240                                        u8 *seq)
 241 {
 242         struct hostapd_data *hapd = ctx;
 243         return hostapd_get_seqnum(hapd->conf->iface, hapd, addr, idx, seq);
 244 }
 245
 246
 247 static int hostapd_wpa_auth_send_eapol(void *ctx, const u8 *addr,
 248                                        const u8 *data, size_t data_len,
 249                                        int encrypt)
 250 {
 251         struct hostapd_data *hapd = ctx;
 252         struct sta_info *sta;
 253         u32 flags = 0;
 254
 255         sta = ap_get_sta(hapd, addr);
 256         if (sta)
 257                 flags = hostapd_sta_flags_to_drv(sta->flags);
 258
 259         return hostapd_drv_hapd_send_eapol(hapd, addr, data, data_len,
 260                                            encrypt, flags);
 261 }
 262
 263
 264 static int hostapd_wpa_auth_for_each_sta(
 265         void *ctx, int (*cb)(struct wpa_state_machine *sm, void *ctx),
 266         void *cb_ctx)
 267 {
 268         struct hostapd_data *hapd = ctx;
 269         struct sta_info *sta;
 270
 271         for (sta = hapd->sta_list; sta; sta = sta->next) {
 272                 if (sta->wpa_sm && cb(sta->wpa_sm, cb_ctx))
 273                         return 1;
 274         }
 275         return 0;
 276 }
 277
 278
 279 struct wpa_auth_iface_iter_data {
 280         int (*cb)(struct wpa_authenticator *sm, void *ctx);
 281         void *cb_ctx;
 282 };
 283
 284 static int wpa_auth_iface_iter(struct hostapd_iface *iface, void *ctx)
 285 {
 286         struct wpa_auth_iface_iter_data *data = ctx;
 287         size_t i;
 288         for (i = 0; i < iface->num_bss; i++) {
 289                 if (iface->bss[i]->wpa_auth &&
 290                     data->cb(iface->bss[i]->wpa_auth, data->cb_ctx))
 291                         return 1;
 292         }
 293         return 0;
 294 }
 295
 296
 297 static int hostapd_wpa_auth_for_each_auth(
 298         void *ctx, int (*cb)(struct wpa_authenticator *sm, void *ctx),
 299         void *cb_ctx)
 300 {
 301         struct hostapd_data *hapd = ctx;
 302         struct wpa_auth_iface_iter_data data;
 303         if (hapd->iface->for_each_interface == NULL)
 304                 return -1;
 305         data.cb = cb;
 306         data.cb_ctx = cb_ctx;
 307         return hapd->iface->for_each_interface(hapd->iface->interfaces,
 308                                                wpa_auth_iface_iter, &data);
 309 }
 310
 311
 312 #ifdef CONFIG_IEEE80211R
 313
 314 struct wpa_auth_ft_iface_iter_data {
 315         struct hostapd_data *src_hapd;
 316         const u8 *dst;
 317         const u8 *data;
 318         size_t data_len;
 319 };
 320
 321
 322 static int hostapd_wpa_auth_ft_iter(struct hostapd_iface *iface, void *ctx)
 323 {
 324         struct wpa_auth_ft_iface_iter_data *idata = ctx;
 325         struct hostapd_data *hapd;
 326         size_t j;
 327
 328         for (j = 0; j < iface->num_bss; j++) {
 329                 hapd = iface->bss[j];
 330                 if (hapd == idata->src_hapd)
 331                         continue;
 332                 if (os_memcmp(hapd->own_addr, idata->dst, ETH_ALEN) == 0) {
 333                         wpa_printf(MSG_DEBUG, "FT: Send RRB data directly to "
 334                                    "locally managed BSS " MACSTR "@%s -> "
 335                                    MACSTR "@%s",
 336                                    MAC2STR(idata->src_hapd->own_addr),
 337                                    idata->src_hapd->conf->iface,
 338                                    MAC2STR(hapd->own_addr), hapd->conf->iface);
 339                         wpa_ft_rrb_rx(hapd->wpa_auth,
 340                                       idata->src_hapd->own_addr,
 341                                       idata->data, idata->data_len);
 342                         return 1;
 343                 }
 344         }
 345
 346         return 0;
 347 }
 348
 349 #endif /* CONFIG_IEEE80211R */
 350
 351
 352 static int hostapd_wpa_auth_send_ether(void *ctx, const u8 *dst, u16 proto,
 353                                        const u8 *data, size_t data_len)
 354 {
 355         struct hostapd_data *hapd = ctx;
 356         struct l2_ethhdr *buf;
 357         int ret;
 358
 359 #ifdef CONFIG_IEEE80211R
 360         if (proto == ETH_P_RRB && hapd->iface->for_each_interface) {
 361                 int res;
 362                 struct wpa_auth_ft_iface_iter_data idata;
 363                 idata.src_hapd = hapd;
 364                 idata.dst = dst;
 365                 idata.data = data;
 366                 idata.data_len = data_len;
 367                 res = hapd->iface->for_each_interface(hapd->iface->interfaces,
 368                                                       hostapd_wpa_auth_ft_iter,
 369                                                       &idata);
 370                 if (res == 1)
 371                         return data_len;
 372         }
 373 #endif /* CONFIG_IEEE80211R */
 374
 375         if (hapd->driver && hapd->driver->send_ether)
 376                 return hapd->driver->send_ether(hapd->drv_priv, dst,
 377                                                 hapd->own_addr, proto,
 378                                                 data, data_len);
 379         if (hapd->l2 == NULL)
 380                 return -1;
 381
 382         buf = os_malloc(sizeof(*buf) + data_len);
 383         if (buf == NULL)
 384                 return -1;
 385         os_memcpy(buf->h_dest, dst, ETH_ALEN);
 386         os_memcpy(buf->h_source, hapd->own_addr, ETH_ALEN);
 387         buf->h_proto = host_to_be16(proto);
 388         os_memcpy(buf + 1, data, data_len);
 389         ret = l2_packet_send(hapd->l2, dst, proto, (u8 *) buf,
 390                              sizeof(*buf) + data_len);
 391         os_free(buf);
 392         return ret;
 393 }
 394
 395
 396 #ifdef CONFIG_IEEE80211R
 397
 398 static int hostapd_wpa_auth_send_ft_action(void *ctx, const u8 *dst,
 399                                            const u8 *data, size_t data_len)
 400 {
 401         struct hostapd_data *hapd = ctx;
 402         int res;
 403         struct ieee80211_mgmt *m;
 404         size_t mlen;
 405         struct sta_info *sta;
 406
 407         sta = ap_get_sta(hapd, dst);
 408         if (sta == NULL || sta->wpa_sm == NULL)
 409                 return -1;
 410
 411         m = os_zalloc(sizeof(*m) + data_len);
 412         if (m == NULL)
 413                 return -1;
 414         mlen = ((u8 *) &m->u - (u8 *) m) + data_len;
 415         m->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 416                                         WLAN_FC_STYPE_ACTION);
 417         os_memcpy(m->da, dst, ETH_ALEN);
 418         os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
 419         os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
 420         os_memcpy(&m->u, data, data_len);
 421
 422         res = hostapd_drv_send_mlme(hapd, (u8 *) m, mlen, 0);
 423         os_free(m);
 424         return res;
 425 }
 426
 427
 428 static struct wpa_state_machine *
 429 hostapd_wpa_auth_add_sta(void *ctx, const u8 *sta_addr)
 430 {
 431         struct hostapd_data *hapd = ctx;
 432         struct sta_info *sta;
 433
 434         sta = ap_sta_add(hapd, sta_addr);
 435         if (sta == NULL)
 436                 return NULL;
 437         if (sta->wpa_sm) {
 438                 sta->auth_alg = WLAN_AUTH_FT;
 439                 return sta->wpa_sm;
 440         }
 441
 442         sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, sta->addr);
 443         if (sta->wpa_sm == NULL) {
 444                 ap_free_sta(hapd, sta);
 445                 return NULL;
 446         }
 447         sta->auth_alg = WLAN_AUTH_FT;
 448
 449         return sta->wpa_sm;
 450 }
 451
 452
 453 static void hostapd_rrb_receive(void *ctx, const u8 *src_addr, const u8 *buf,
 454                                 size_t len)
 455 {
 456         struct hostapd_data *hapd = ctx;
 457         struct l2_ethhdr *ethhdr;
 458         if (len < sizeof(*ethhdr))
 459                 return;
 460         ethhdr = (struct l2_ethhdr *) buf;
 461         wpa_printf(MSG_DEBUG, "FT: RRB received packet " MACSTR " -> "
 462                    MACSTR, MAC2STR(ethhdr->h_source), MAC2STR(ethhdr->h_dest));
 463         wpa_ft_rrb_rx(hapd->wpa_auth, ethhdr->h_source, buf + sizeof(*ethhdr),
 464                       len - sizeof(*ethhdr));
 465 }
 466
 467 #endif /* CONFIG_IEEE80211R */
 468
 469
 470 int hostapd_setup_wpa(struct hostapd_data *hapd)
 471 {
 472         struct wpa_auth_config _conf;
 473         struct wpa_auth_callbacks cb;
 474         const u8 *wpa_ie;
 475         size_t wpa_ie_len;
 476
 477         hostapd_wpa_auth_conf(hapd->conf, &_conf);
 478         if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_EAPOL_TX_STATUS)
 479                 _conf.tx_status = 1;
 480         os_memset(&cb, 0, sizeof(cb));
 481         cb.ctx = hapd;
 482         cb.logger = hostapd_wpa_auth_logger;
 483         cb.disconnect = hostapd_wpa_auth_disconnect;
 484         cb.mic_failure_report = hostapd_wpa_auth_mic_failure_report;
 485         cb.set_eapol = hostapd_wpa_auth_set_eapol;
 486         cb.get_eapol = hostapd_wpa_auth_get_eapol;
 487         cb.get_psk = hostapd_wpa_auth_get_psk;
 488         cb.get_msk = hostapd_wpa_auth_get_msk;
 489         cb.set_key = hostapd_wpa_auth_set_key;
 490         cb.get_seqnum = hostapd_wpa_auth_get_seqnum;
 491         cb.send_eapol = hostapd_wpa_auth_send_eapol;
 492         cb.for_each_sta = hostapd_wpa_auth_for_each_sta;
 493         cb.for_each_auth = hostapd_wpa_auth_for_each_auth;
 494         cb.send_ether = hostapd_wpa_auth_send_ether;
 495 #ifdef CONFIG_IEEE80211R
 496         cb.send_ft_action = hostapd_wpa_auth_send_ft_action;
 497         cb.add_sta = hostapd_wpa_auth_add_sta;
 498 #endif /* CONFIG_IEEE80211R */
 499         hapd->wpa_auth = wpa_init(hapd->own_addr, &_conf, &cb);
 500         if (hapd->wpa_auth == NULL) {
 501                 wpa_printf(MSG_ERROR, "WPA initialization failed.");
 502                 return -1;
 503         }
 504
 505         if (hostapd_set_privacy(hapd, 1)) {
 506                 wpa_printf(MSG_ERROR, "Could not set PrivacyInvoked "
 507                            "for interface %s", hapd->conf->iface);
 508                 return -1;
 509         }
 510
 511         wpa_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &wpa_ie_len);
 512         if (hostapd_set_generic_elem(hapd, wpa_ie, wpa_ie_len)) {
 513                 wpa_printf(MSG_ERROR, "Failed to configure WPA IE for "
 514                            "the kernel driver.");
 515                 return -1;
 516         }
 517
 518         if (rsn_preauth_iface_init(hapd)) {
 519                 wpa_printf(MSG_ERROR, "Initialization of RSN "
 520                            "pre-authentication failed.");
 521                 return -1;
 522         }
 523
 524 #ifdef CONFIG_IEEE80211R
 525         if (!hostapd_drv_none(hapd)) {
 526                 hapd->l2 = l2_packet_init(hapd->conf->bridge[0] ?
 527                                           hapd->conf->bridge :
 528                                           hapd->conf->iface, NULL, ETH_P_RRB,
 529                                           hostapd_rrb_receive, hapd, 1);
 530                 if (hapd->l2 == NULL &&
 531                     (hapd->driver == NULL ||
 532                      hapd->driver->send_ether == NULL)) {
 533                         wpa_printf(MSG_ERROR, "Failed to open l2_packet "
 534                                    "interface");
 535                         return -1;
 536                 }
 537         }
 538 #endif /* CONFIG_IEEE80211R */
 539
 540         return 0;
 541
 542 }
 543
 544
 545 void hostapd_reconfig_wpa(struct hostapd_data *hapd)
 546 {
 547         struct wpa_auth_config wpa_auth_conf;
 548         hostapd_wpa_auth_conf(hapd->conf, &wpa_auth_conf);
 549         wpa_reconfig(hapd->wpa_auth, &wpa_auth_conf);
 550 }
 551
 552
 553 void hostapd_deinit_wpa(struct hostapd_data *hapd)
 554 {
 555         ieee80211_tkip_countermeasures_deinit(hapd);
 556         rsn_preauth_iface_deinit(hapd);
 557         if (hapd->wpa_auth) {
 558                 wpa_deinit(hapd->wpa_auth);
 559                 hapd->wpa_auth = NULL;
 560
 561                 if (hostapd_set_privacy(hapd, 0)) {
 562                         wpa_printf(MSG_DEBUG, "Could not disable "
 563                                    "PrivacyInvoked for interface %s",
 564                                    hapd->conf->iface);
 565                 }
 566
 567                 if (hostapd_set_generic_elem(hapd, (u8 *) "", 0)) {
 568                         wpa_printf(MSG_DEBUG, "Could not remove generic "
 569                                    "information element from interface %s",
 570                                    hapd->conf->iface);
 571                 }
 572         }
 573         ieee802_1x_deinit(hapd);
 574
 575 #ifdef CONFIG_IEEE80211R
 576         l2_packet_deinit(hapd->l2);
 577 #endif /* CONFIG_IEEE80211R */
 578 }