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