src/ap/ap_config.c

   1 /*
   2  * hostapd / Configuration helper functions
   3  * Copyright (c) 2003-2009, 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 "crypto/sha1.h"
  19 #include "radius/radius_client.h"
  20 #include "common/ieee802_11_defs.h"
  21 #include "common/eapol_common.h"
  22 #include "eap_common/eap_wsc_common.h"
  23 #include "eap_server/eap.h"
  24 #include "wpa_auth.h"
  25 #include "sta_info.h"
  26 #include "ap_config.h"
  27
  28
  29 static void hostapd_config_free_vlan(struct hostapd_bss_config *bss)
  30 {
  31         struct hostapd_vlan *vlan, *prev;
  32
  33         vlan = bss->vlan;
  34         prev = NULL;
  35         while (vlan) {
  36                 prev = vlan;
  37                 vlan = vlan->next;
  38                 os_free(prev);
  39         }
  40
  41         bss->vlan = NULL;
  42 }
  43
  44
  45 void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
  46 {
  47         bss->logger_syslog_level = HOSTAPD_LEVEL_INFO;
  48         bss->logger_stdout_level = HOSTAPD_LEVEL_INFO;
  49         bss->logger_syslog = (unsigned int) -1;
  50         bss->logger_stdout = (unsigned int) -1;
  51
  52         bss->auth_algs = WPA_AUTH_ALG_OPEN | WPA_AUTH_ALG_SHARED;
  53
  54         bss->wep_rekeying_period = 300;
  55         /* use key0 in individual key and key1 in broadcast key */
  56         bss->broadcast_key_idx_min = 1;
  57         bss->broadcast_key_idx_max = 2;
  58         bss->eap_reauth_period = 3600;
  59
  60         bss->wpa_group_rekey = 600;
  61         bss->wpa_gmk_rekey = 86400;
  62         bss->wpa_key_mgmt = WPA_KEY_MGMT_PSK;
  63         bss->wpa_pairwise = WPA_CIPHER_TKIP;
  64         bss->wpa_group = WPA_CIPHER_TKIP;
  65         bss->rsn_pairwise = 0;
  66
  67         bss->max_num_sta = MAX_STA_COUNT;
  68
  69         bss->dtim_period = 2;
  70
  71         bss->radius_server_auth_port = 1812;
  72         bss->ap_max_inactivity = AP_MAX_INACTIVITY;
  73         bss->eapol_version = EAPOL_VERSION;
  74
  75         bss->max_listen_interval = 65535;
  76
  77 #ifdef CONFIG_IEEE80211W
  78         bss->assoc_sa_query_max_timeout = 1000;
  79         bss->assoc_sa_query_retry_timeout = 201;
  80 #endif /* CONFIG_IEEE80211W */
  81 #ifdef EAP_SERVER_FAST
  82          /* both anonymous and authenticated provisioning */
  83         bss->eap_fast_prov = 3;
  84         bss->pac_key_lifetime = 7 * 24 * 60 * 60;
  85         bss->pac_key_refresh_time = 1 * 24 * 60 * 60;
  86 #endif /* EAP_SERVER_FAST */
  87 }
  88
  89
  90 struct hostapd_config * hostapd_config_defaults(void)
  91 {
  92         struct hostapd_config *conf;
  93         struct hostapd_bss_config *bss;
  94         int i;
  95         const int aCWmin = 15, aCWmax = 1024;
  96         const struct hostapd_wmm_ac_params ac_bk =
  97                 { aCWmin, aCWmax, 7, 0, 0 }; /* background traffic */
  98         const struct hostapd_wmm_ac_params ac_be =
  99                 { aCWmin, aCWmax, 3, 0, 0 }; /* best effort traffic */
 100         const struct hostapd_wmm_ac_params ac_vi = /* video traffic */
 101                 { aCWmin >> 1, aCWmin, 2, 3000 / 32, 1 };
 102         const struct hostapd_wmm_ac_params ac_vo = /* voice traffic */
 103                 { aCWmin >> 2, aCWmin >> 1, 2, 1500 / 32, 1 };
 104
 105         conf = os_zalloc(sizeof(*conf));
 106         bss = os_zalloc(sizeof(*bss));
 107         if (conf == NULL || bss == NULL) {
 108                 wpa_printf(MSG_ERROR, "Failed to allocate memory for "
 109                            "configuration data.");
 110                 os_free(conf);
 111                 os_free(bss);
 112                 return NULL;
 113         }
 114
 115         bss->radius = os_zalloc(sizeof(*bss->radius));
 116         if (bss->radius == NULL) {
 117                 os_free(conf);
 118                 os_free(bss);
 119                 return NULL;
 120         }
 121
 122         hostapd_config_defaults_bss(bss);
 123
 124         conf->num_bss = 1;
 125         conf->bss = bss;
 126
 127         conf->beacon_int = 100;
 128         conf->rts_threshold = -1; /* use driver default: 2347 */
 129         conf->fragm_threshold = -1; /* user driver default: 2346 */
 130         conf->send_probe_response = 1;
 131
 132         for (i = 0; i < NUM_TX_QUEUES; i++)
 133                 conf->tx_queue[i].aifs = -1; /* use hw default */
 134
 135         conf->wmm_ac_params[0] = ac_be;
 136         conf->wmm_ac_params[1] = ac_bk;
 137         conf->wmm_ac_params[2] = ac_vi;
 138         conf->wmm_ac_params[3] = ac_vo;
 139
 140         conf->ht_capab = HT_CAP_INFO_SMPS_DISABLED;
 141
 142         return conf;
 143 }
 144
 145
 146 int hostapd_mac_comp(const void *a, const void *b)
 147 {
 148         return os_memcmp(a, b, sizeof(macaddr));
 149 }
 150
 151
 152 int hostapd_mac_comp_empty(const void *a)
 153 {
 154         macaddr empty = { 0 };
 155         return os_memcmp(a, empty, sizeof(macaddr));
 156 }
 157
 158
 159 static int hostapd_config_read_wpa_psk(const char *fname,
 160                                        struct hostapd_ssid *ssid)
 161 {
 162         FILE *f;
 163         char buf[128], *pos;
 164         int line = 0, ret = 0, len, ok;
 165         u8 addr[ETH_ALEN];
 166         struct hostapd_wpa_psk *psk;
 167
 168         if (!fname)
 169                 return 0;
 170
 171         f = fopen(fname, "r");
 172         if (!f) {
 173                 wpa_printf(MSG_ERROR, "WPA PSK file '%s' not found.", fname);
 174                 return -1;
 175         }
 176
 177         while (fgets(buf, sizeof(buf), f)) {
 178                 line++;
 179
 180                 if (buf[0] == '#')
 181                         continue;
 182                 pos = buf;
 183                 while (*pos != '\0') {
 184                         if (*pos == '\n') {
 185                                 *pos = '\0';
 186                                 break;
 187                         }
 188                         pos++;
 189                 }
 190                 if (buf[0] == '\0')
 191                         continue;
 192
 193                 if (hwaddr_aton(buf, addr)) {
 194                         wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
 195                                    "line %d in '%s'", buf, line, fname);
 196                         ret = -1;
 197                         break;
 198                 }
 199
 200                 psk = os_zalloc(sizeof(*psk));
 201                 if (psk == NULL) {
 202                         wpa_printf(MSG_ERROR, "WPA PSK allocation failed");
 203                         ret = -1;
 204                         break;
 205                 }
 206                 if (is_zero_ether_addr(addr))
 207                         psk->group = 1;
 208                 else
 209                         os_memcpy(psk->addr, addr, ETH_ALEN);
 210
 211                 pos = buf + 17;
 212                 if (*pos == '\0') {
 213                         wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
 214                                    line, fname);
 215                         os_free(psk);
 216                         ret = -1;
 217                         break;
 218                 }
 219                 pos++;
 220
 221                 ok = 0;
 222                 len = os_strlen(pos);
 223                 if (len == 64 && hexstr2bin(pos, psk->psk, PMK_LEN) == 0)
 224                         ok = 1;
 225                 else if (len >= 8 && len < 64) {
 226                         pbkdf2_sha1(pos, ssid->ssid, ssid->ssid_len,
 227                                     4096, psk->psk, PMK_LEN);
 228                         ok = 1;
 229                 }
 230                 if (!ok) {
 231                         wpa_printf(MSG_ERROR, "Invalid PSK '%s' on line %d in "
 232                                    "'%s'", pos, line, fname);
 233                         os_free(psk);
 234                         ret = -1;
 235                         break;
 236                 }
 237
 238                 psk->next = ssid->wpa_psk;
 239                 ssid->wpa_psk = psk;
 240         }
 241
 242         fclose(f);
 243
 244         return ret;
 245 }
 246
 247
 248 static int hostapd_derive_psk(struct hostapd_ssid *ssid)
 249 {
 250         ssid->wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
 251         if (ssid->wpa_psk == NULL) {
 252                 wpa_printf(MSG_ERROR, "Unable to alloc space for PSK");
 253                 return -1;
 254         }
 255         wpa_hexdump_ascii(MSG_DEBUG, "SSID",
 256                           (u8 *) ssid->ssid, ssid->ssid_len);
 257         wpa_hexdump_ascii_key(MSG_DEBUG, "PSK (ASCII passphrase)",
 258                               (u8 *) ssid->wpa_passphrase,
 259                               os_strlen(ssid->wpa_passphrase));
 260         pbkdf2_sha1(ssid->wpa_passphrase,
 261                     ssid->ssid, ssid->ssid_len,
 262                     4096, ssid->wpa_psk->psk, PMK_LEN);
 263         wpa_hexdump_key(MSG_DEBUG, "PSK (from passphrase)",
 264                         ssid->wpa_psk->psk, PMK_LEN);
 265         return 0;
 266 }
 267
 268
 269 int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf)
 270 {
 271         struct hostapd_ssid *ssid = &conf->ssid;
 272
 273         if (ssid->wpa_passphrase != NULL) {
 274                 if (ssid->wpa_psk != NULL) {
 275                         wpa_printf(MSG_DEBUG, "Using pre-configured WPA PSK "
 276                                    "instead of passphrase");
 277                 } else {
 278                         wpa_printf(MSG_DEBUG, "Deriving WPA PSK based on "
 279                                    "passphrase");
 280                         if (hostapd_derive_psk(ssid) < 0)
 281                                 return -1;
 282                 }
 283                 ssid->wpa_psk->group = 1;
 284         }
 285
 286         if (ssid->wpa_psk_file) {
 287                 if (hostapd_config_read_wpa_psk(ssid->wpa_psk_file,
 288                                                 &conf->ssid))
 289                         return -1;
 290         }
 291
 292         return 0;
 293 }
 294
 295
 296 int hostapd_wep_key_cmp(struct hostapd_wep_keys *a, struct hostapd_wep_keys *b)
 297 {
 298         int i;
 299
 300         if (a->idx != b->idx || a->default_len != b->default_len)
 301                 return 1;
 302         for (i = 0; i < NUM_WEP_KEYS; i++)
 303                 if (a->len[i] != b->len[i] ||
 304                     os_memcmp(a->key[i], b->key[i], a->len[i]) != 0)
 305                         return 1;
 306         return 0;
 307 }
 308
 309
 310 static void hostapd_config_free_radius(struct hostapd_radius_server *servers,
 311                                        int num_servers)
 312 {
 313         int i;
 314
 315         for (i = 0; i < num_servers; i++) {
 316                 os_free(servers[i].shared_secret);
 317         }
 318         os_free(servers);
 319 }
 320
 321
 322 static void hostapd_config_free_eap_user(struct hostapd_eap_user *user)
 323 {
 324         os_free(user->identity);
 325         os_free(user->password);
 326         os_free(user);
 327 }
 328
 329
 330 static void hostapd_config_free_wep(struct hostapd_wep_keys *keys)
 331 {
 332         int i;
 333         for (i = 0; i < NUM_WEP_KEYS; i++) {
 334                 os_free(keys->key[i]);
 335                 keys->key[i] = NULL;
 336         }
 337 }
 338
 339
 340 static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
 341 {
 342         struct hostapd_wpa_psk *psk, *prev;
 343         struct hostapd_eap_user *user, *prev_user;
 344
 345         if (conf == NULL)
 346                 return;
 347
 348         psk = conf->ssid.wpa_psk;
 349         while (psk) {
 350                 prev = psk;
 351                 psk = psk->next;
 352                 os_free(prev);
 353         }
 354
 355         os_free(conf->ssid.wpa_passphrase);
 356         os_free(conf->ssid.wpa_psk_file);
 357 #ifdef CONFIG_FULL_DYNAMIC_VLAN
 358         os_free(conf->ssid.vlan_tagged_interface);
 359 #endif /* CONFIG_FULL_DYNAMIC_VLAN */
 360
 361         user = conf->eap_user;
 362         while (user) {
 363                 prev_user = user;
 364                 user = user->next;
 365                 hostapd_config_free_eap_user(prev_user);
 366         }
 367
 368         os_free(conf->dump_log_name);
 369         os_free(conf->eap_req_id_text);
 370         os_free(conf->accept_mac);
 371         os_free(conf->deny_mac);
 372         os_free(conf->nas_identifier);
 373         hostapd_config_free_radius(conf->radius->auth_servers,
 374                                    conf->radius->num_auth_servers);
 375         hostapd_config_free_radius(conf->radius->acct_servers,
 376                                    conf->radius->num_acct_servers);
 377         os_free(conf->rsn_preauth_interfaces);
 378         os_free(conf->ctrl_interface);
 379         os_free(conf->ca_cert);
 380         os_free(conf->server_cert);
 381         os_free(conf->private_key);
 382         os_free(conf->private_key_passwd);
 383         os_free(conf->dh_file);
 384         os_free(conf->pac_opaque_encr_key);
 385         os_free(conf->eap_fast_a_id);
 386         os_free(conf->eap_fast_a_id_info);
 387         os_free(conf->eap_sim_db);
 388         os_free(conf->radius_server_clients);
 389         os_free(conf->test_socket);
 390         os_free(conf->radius);
 391         hostapd_config_free_vlan(conf);
 392         if (conf->ssid.dyn_vlan_keys) {
 393                 struct hostapd_ssid *ssid = &conf->ssid;
 394                 size_t i;
 395                 for (i = 0; i <= ssid->max_dyn_vlan_keys; i++) {
 396                         if (ssid->dyn_vlan_keys[i] == NULL)
 397                                 continue;
 398                         hostapd_config_free_wep(ssid->dyn_vlan_keys[i]);
 399                         os_free(ssid->dyn_vlan_keys[i]);
 400                 }
 401                 os_free(ssid->dyn_vlan_keys);
 402                 ssid->dyn_vlan_keys = NULL;
 403         }
 404
 405 #ifdef CONFIG_IEEE80211R
 406         {
 407                 struct ft_remote_r0kh *r0kh, *r0kh_prev;
 408                 struct ft_remote_r1kh *r1kh, *r1kh_prev;
 409
 410                 r0kh = conf->r0kh_list;
 411                 conf->r0kh_list = NULL;
 412                 while (r0kh) {
 413                         r0kh_prev = r0kh;
 414                         r0kh = r0kh->next;
 415                         os_free(r0kh_prev);
 416                 }
 417
 418                 r1kh = conf->r1kh_list;
 419                 conf->r1kh_list = NULL;
 420                 while (r1kh) {
 421                         r1kh_prev = r1kh;
 422                         r1kh = r1kh->next;
 423                         os_free(r1kh_prev);
 424                 }
 425         }
 426 #endif /* CONFIG_IEEE80211R */
 427
 428 #ifdef CONFIG_WPS
 429         os_free(conf->wps_pin_requests);
 430         os_free(conf->device_name);
 431         os_free(conf->manufacturer);
 432         os_free(conf->model_name);
 433         os_free(conf->model_number);
 434         os_free(conf->serial_number);
 435         os_free(conf->device_type);
 436         os_free(conf->config_methods);
 437         os_free(conf->ap_pin);
 438         os_free(conf->extra_cred);
 439         os_free(conf->ap_settings);
 440         os_free(conf->upnp_iface);
 441         os_free(conf->friendly_name);
 442         os_free(conf->manufacturer_url);
 443         os_free(conf->model_description);
 444         os_free(conf->model_url);
 445         os_free(conf->upc);
 446 #endif /* CONFIG_WPS */
 447 }
 448
 449
 450 /**
 451  * hostapd_config_free - Free hostapd configuration
 452  * @conf: Configuration data from hostapd_config_read().
 453  */
 454 void hostapd_config_free(struct hostapd_config *conf)
 455 {
 456         size_t i;
 457
 458         if (conf == NULL)
 459                 return;
 460
 461         for (i = 0; i < conf->num_bss; i++)
 462                 hostapd_config_free_bss(&conf->bss[i]);
 463         os_free(conf->bss);
 464         os_free(conf->supported_rates);
 465         os_free(conf->basic_rates);
 466
 467         os_free(conf);
 468 }
 469
 470
 471 /**
 472  * hostapd_maclist_found - Find a MAC address from a list
 473  * @list: MAC address list
 474  * @num_entries: Number of addresses in the list
 475  * @addr: Address to search for
 476  * @vlan_id: Buffer for returning VLAN ID or %NULL if not needed
 477  * Returns: 1 if address is in the list or 0 if not.
 478  *
 479  * Perform a binary search for given MAC address from a pre-sorted list.
 480  */
 481 int hostapd_maclist_found(struct mac_acl_entry *list, int num_entries,
 482                           const u8 *addr, int *vlan_id)
 483 {
 484         int start, end, middle, res;
 485
 486         start = 0;
 487         end = num_entries - 1;
 488
 489         while (start <= end) {
 490                 middle = (start + end) / 2;
 491                 res = os_memcmp(list[middle].addr, addr, ETH_ALEN);
 492                 if (res == 0) {
 493                         if (vlan_id)
 494                                 *vlan_id = list[middle].vlan_id;
 495                         return 1;
 496                 }
 497                 if (res < 0)
 498                         start = middle + 1;
 499                 else
 500                         end = middle - 1;
 501         }
 502
 503         return 0;
 504 }
 505
 506
 507 int hostapd_rate_found(int *list, int rate)
 508 {
 509         int i;
 510
 511         if (list == NULL)
 512                 return 0;
 513
 514         for (i = 0; list[i] >= 0; i++)
 515                 if (list[i] == rate)
 516                         return 1;
 517
 518         return 0;
 519 }
 520
 521
 522 const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
 523 {
 524         struct hostapd_vlan *v = vlan;
 525         while (v) {
 526                 if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
 527                         return v->ifname;
 528                 v = v->next;
 529         }
 530         return NULL;
 531 }
 532
 533
 534 const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
 535                            const u8 *addr, const u8 *prev_psk)
 536 {
 537         struct hostapd_wpa_psk *psk;
 538         int next_ok = prev_psk == NULL;
 539
 540         for (psk = conf->ssid.wpa_psk; psk != NULL; psk = psk->next) {
 541                 if (next_ok &&
 542                     (psk->group || os_memcmp(psk->addr, addr, ETH_ALEN) == 0))
 543                         return psk->psk;
 544
 545                 if (psk->psk == prev_psk)
 546                         next_ok = 1;
 547         }
 548
 549         return NULL;
 550 }
 551
 552
 553 const struct hostapd_eap_user *
 554 hostapd_get_eap_user(const struct hostapd_bss_config *conf, const u8 *identity,
 555                      size_t identity_len, int phase2)
 556 {
 557         struct hostapd_eap_user *user = conf->eap_user;
 558
 559 #ifdef CONFIG_WPS
 560         if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
 561             os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
 562                 static struct hostapd_eap_user wsc_enrollee;
 563                 os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
 564                 wsc_enrollee.methods[0].method = eap_server_get_type(
 565                         "WSC", &wsc_enrollee.methods[0].vendor);
 566                 return &wsc_enrollee;
 567         }
 568
 569         if (conf->wps_state && conf->ap_pin &&
 570             identity_len == WSC_ID_REGISTRAR_LEN &&
 571             os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
 572                 static struct hostapd_eap_user wsc_registrar;
 573                 os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
 574                 wsc_registrar.methods[0].method = eap_server_get_type(
 575                         "WSC", &wsc_registrar.methods[0].vendor);
 576                 wsc_registrar.password = (u8 *) conf->ap_pin;
 577                 wsc_registrar.password_len = os_strlen(conf->ap_pin);
 578                 return &wsc_registrar;
 579         }
 580 #endif /* CONFIG_WPS */
 581
 582         while (user) {
 583                 if (!phase2 && user->identity == NULL) {
 584                         /* Wildcard match */
 585                         break;
 586                 }
 587
 588                 if (user->phase2 == !!phase2 && user->wildcard_prefix &&
 589                     identity_len >= user->identity_len &&
 590                     os_memcmp(user->identity, identity, user->identity_len) ==
 591                     0) {
 592                         /* Wildcard prefix match */
 593                         break;
 594                 }
 595
 596                 if (user->phase2 == !!phase2 &&
 597                     user->identity_len == identity_len &&
 598                     os_memcmp(user->identity, identity, identity_len) == 0)
 599                         break;
 600                 user = user->next;
 601         }
 602
 603         return user;
 604 }