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         bss->pwd_group = 19; /* ECC: GF(p=256) */
  78
  79 #ifdef CONFIG_IEEE80211W
  80         bss->assoc_sa_query_max_timeout = 1000;
  81         bss->assoc_sa_query_retry_timeout = 201;
  82 #endif /* CONFIG_IEEE80211W */
  83 #ifdef EAP_SERVER_FAST
  84          /* both anonymous and authenticated provisioning */
  85         bss->eap_fast_prov = 3;
  86         bss->pac_key_lifetime = 7 * 24 * 60 * 60;
  87         bss->pac_key_refresh_time = 1 * 24 * 60 * 60;
  88 #endif /* EAP_SERVER_FAST */
  89
  90         /* Set to -1 as defaults depends on HT in setup */
  91         bss->wmm_enabled = -1;
  92
  93 #ifdef CONFIG_IEEE80211R
  94         bss->ft_over_ds = 1;
  95 #endif /* CONFIG_IEEE80211R */
  96 }
  97
  98
  99 struct hostapd_config * hostapd_config_defaults(void)
 100 {
 101 #define ecw2cw(ecw) ((1 << (ecw)) - 1)
 102
 103         struct hostapd_config *conf;
 104         struct hostapd_bss_config *bss;
 105         const int aCWmin = 4, aCWmax = 10;
 106         const struct hostapd_wmm_ac_params ac_bk =
 107                 { aCWmin, aCWmax, 7, 0, 0 }; /* background traffic */
 108         const struct hostapd_wmm_ac_params ac_be =
 109                 { aCWmin, aCWmax, 3, 0, 0 }; /* best effort traffic */
 110         const struct hostapd_wmm_ac_params ac_vi = /* video traffic */
 111                 { aCWmin - 1, aCWmin, 2, 3000 / 32, 1 };
 112         const struct hostapd_wmm_ac_params ac_vo = /* voice traffic */
 113                 { aCWmin - 2, aCWmin - 1, 2, 1500 / 32, 1 };
 114         const struct hostapd_tx_queue_params txq_bk =
 115                 { 7, ecw2cw(aCWmin), ecw2cw(aCWmax), 0 };
 116         const struct hostapd_tx_queue_params txq_be =
 117                 { 3, ecw2cw(aCWmin), 4 * (ecw2cw(aCWmin) + 1) - 1, 0};
 118         const struct hostapd_tx_queue_params txq_vi =
 119                 { 1, (ecw2cw(aCWmin) + 1) / 2 - 1, ecw2cw(aCWmin), 30};
 120         const struct hostapd_tx_queue_params txq_vo =
 121                 { 1, (ecw2cw(aCWmin) + 1) / 4 - 1,
 122                   (ecw2cw(aCWmin) + 1) / 2 - 1, 15};
 123
 124 #undef ecw2cw
 125
 126         conf = os_zalloc(sizeof(*conf));
 127         bss = os_zalloc(sizeof(*bss));
 128         if (conf == NULL || bss == NULL) {
 129                 wpa_printf(MSG_ERROR, "Failed to allocate memory for "
 130                            "configuration data.");
 131                 os_free(conf);
 132                 os_free(bss);
 133                 return NULL;
 134         }
 135
 136         bss->radius = os_zalloc(sizeof(*bss->radius));
 137         if (bss->radius == NULL) {
 138                 os_free(conf);
 139                 os_free(bss);
 140                 return NULL;
 141         }
 142
 143         hostapd_config_defaults_bss(bss);
 144
 145         conf->num_bss = 1;
 146         conf->bss = bss;
 147
 148         conf->beacon_int = 100;
 149         conf->rts_threshold = -1; /* use driver default: 2347 */
 150         conf->fragm_threshold = -1; /* user driver default: 2346 */
 151         conf->send_probe_response = 1;
 152
 153         conf->wmm_ac_params[0] = ac_be;
 154         conf->wmm_ac_params[1] = ac_bk;
 155         conf->wmm_ac_params[2] = ac_vi;
 156         conf->wmm_ac_params[3] = ac_vo;
 157
 158         conf->tx_queue[0] = txq_vo;
 159         conf->tx_queue[1] = txq_vi;
 160         conf->tx_queue[2] = txq_be;
 161         conf->tx_queue[3] = txq_bk;
 162
 163         conf->ht_capab = HT_CAP_INFO_SMPS_DISABLED;
 164
 165         return conf;
 166 }
 167
 168
 169 int hostapd_mac_comp(const void *a, const void *b)
 170 {
 171         return os_memcmp(a, b, sizeof(macaddr));
 172 }
 173
 174
 175 int hostapd_mac_comp_empty(const void *a)
 176 {
 177         macaddr empty = { 0 };
 178         return os_memcmp(a, empty, sizeof(macaddr));
 179 }
 180
 181
 182 static int hostapd_config_read_wpa_psk(const char *fname,
 183                                        struct hostapd_ssid *ssid)
 184 {
 185         FILE *f;
 186         char buf[128], *pos;
 187         int line = 0, ret = 0, len, ok;
 188         u8 addr[ETH_ALEN];
 189         struct hostapd_wpa_psk *psk;
 190
 191         if (!fname)
 192                 return 0;
 193
 194         f = fopen(fname, "r");
 195         if (!f) {
 196                 wpa_printf(MSG_ERROR, "WPA PSK file '%s' not found.", fname);
 197                 return -1;
 198         }
 199
 200         while (fgets(buf, sizeof(buf), f)) {
 201                 line++;
 202
 203                 if (buf[0] == '#')
 204                         continue;
 205                 pos = buf;
 206                 while (*pos != '\0') {
 207                         if (*pos == '\n') {
 208                                 *pos = '\0';
 209                                 break;
 210                         }
 211                         pos++;
 212                 }
 213                 if (buf[0] == '\0')
 214                         continue;
 215
 216                 if (hwaddr_aton(buf, addr)) {
 217                         wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
 218                                    "line %d in '%s'", buf, line, fname);
 219                         ret = -1;
 220                         break;
 221                 }
 222
 223                 psk = os_zalloc(sizeof(*psk));
 224                 if (psk == NULL) {
 225                         wpa_printf(MSG_ERROR, "WPA PSK allocation failed");
 226                         ret = -1;
 227                         break;
 228                 }
 229                 if (is_zero_ether_addr(addr))
 230                         psk->group = 1;
 231                 else
 232                         os_memcpy(psk->addr, addr, ETH_ALEN);
 233
 234                 pos = buf + 17;
 235                 if (*pos == '\0') {
 236                         wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
 237                                    line, fname);
 238                         os_free(psk);
 239                         ret = -1;
 240                         break;
 241                 }
 242                 pos++;
 243
 244                 ok = 0;
 245                 len = os_strlen(pos);
 246                 if (len == 64 && hexstr2bin(pos, psk->psk, PMK_LEN) == 0)
 247                         ok = 1;
 248                 else if (len >= 8 && len < 64) {
 249                         pbkdf2_sha1(pos, ssid->ssid, ssid->ssid_len,
 250                                     4096, psk->psk, PMK_LEN);
 251                         ok = 1;
 252                 }
 253                 if (!ok) {
 254                         wpa_printf(MSG_ERROR, "Invalid PSK '%s' on line %d in "
 255                                    "'%s'", pos, line, fname);
 256                         os_free(psk);
 257                         ret = -1;
 258                         break;
 259                 }
 260
 261                 psk->next = ssid->wpa_psk;
 262                 ssid->wpa_psk = psk;
 263         }
 264
 265         fclose(f);
 266
 267         return ret;
 268 }
 269
 270
 271 static int hostapd_derive_psk(struct hostapd_ssid *ssid)
 272 {
 273         ssid->wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
 274         if (ssid->wpa_psk == NULL) {
 275                 wpa_printf(MSG_ERROR, "Unable to alloc space for PSK");
 276                 return -1;
 277         }
 278         wpa_hexdump_ascii(MSG_DEBUG, "SSID",
 279                           (u8 *) ssid->ssid, ssid->ssid_len);
 280         wpa_hexdump_ascii_key(MSG_DEBUG, "PSK (ASCII passphrase)",
 281                               (u8 *) ssid->wpa_passphrase,
 282                               os_strlen(ssid->wpa_passphrase));
 283         pbkdf2_sha1(ssid->wpa_passphrase,
 284                     ssid->ssid, ssid->ssid_len,
 285                     4096, ssid->wpa_psk->psk, PMK_LEN);
 286         wpa_hexdump_key(MSG_DEBUG, "PSK (from passphrase)",
 287                         ssid->wpa_psk->psk, PMK_LEN);
 288         return 0;
 289 }
 290
 291
 292 int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf)
 293 {
 294         struct hostapd_ssid *ssid = &conf->ssid;
 295
 296         if (ssid->wpa_passphrase != NULL) {
 297                 if (ssid->wpa_psk != NULL) {
 298                         wpa_printf(MSG_DEBUG, "Using pre-configured WPA PSK "
 299                                    "instead of passphrase");
 300                 } else {
 301                         wpa_printf(MSG_DEBUG, "Deriving WPA PSK based on "
 302                                    "passphrase");
 303                         if (hostapd_derive_psk(ssid) < 0)
 304                                 return -1;
 305                 }
 306                 ssid->wpa_psk->group = 1;
 307         }
 308
 309         if (ssid->wpa_psk_file) {
 310                 if (hostapd_config_read_wpa_psk(ssid->wpa_psk_file,
 311                                                 &conf->ssid))
 312                         return -1;
 313         }
 314
 315         return 0;
 316 }
 317
 318
 319 int hostapd_wep_key_cmp(struct hostapd_wep_keys *a, struct hostapd_wep_keys *b)
 320 {
 321         int i;
 322
 323         if (a->idx != b->idx || a->default_len != b->default_len)
 324                 return 1;
 325         for (i = 0; i < NUM_WEP_KEYS; i++)
 326                 if (a->len[i] != b->len[i] ||
 327                     os_memcmp(a->key[i], b->key[i], a->len[i]) != 0)
 328                         return 1;
 329         return 0;
 330 }
 331
 332
 333 static void hostapd_config_free_radius(struct hostapd_radius_server *servers,
 334                                        int num_servers)
 335 {
 336         int i;
 337
 338         for (i = 0; i < num_servers; i++) {
 339                 os_free(servers[i].shared_secret);
 340         }
 341         os_free(servers);
 342 }
 343
 344
 345 static void hostapd_config_free_eap_user(struct hostapd_eap_user *user)
 346 {
 347         os_free(user->identity);
 348         os_free(user->password);
 349         os_free(user);
 350 }
 351
 352
 353 static void hostapd_config_free_wep(struct hostapd_wep_keys *keys)
 354 {
 355         int i;
 356         for (i = 0; i < NUM_WEP_KEYS; i++) {
 357                 os_free(keys->key[i]);
 358                 keys->key[i] = NULL;
 359         }
 360 }
 361
 362
 363 static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
 364 {
 365         struct hostapd_wpa_psk *psk, *prev;
 366         struct hostapd_eap_user *user, *prev_user;
 367
 368         if (conf == NULL)
 369                 return;
 370
 371         psk = conf->ssid.wpa_psk;
 372         while (psk) {
 373                 prev = psk;
 374                 psk = psk->next;
 375                 os_free(prev);
 376         }
 377
 378         os_free(conf->ssid.wpa_passphrase);
 379         os_free(conf->ssid.wpa_psk_file);
 380         hostapd_config_free_wep(&conf->ssid.wep);
 381 #ifdef CONFIG_FULL_DYNAMIC_VLAN
 382         os_free(conf->ssid.vlan_tagged_interface);
 383 #endif /* CONFIG_FULL_DYNAMIC_VLAN */
 384
 385         user = conf->eap_user;
 386         while (user) {
 387                 prev_user = user;
 388                 user = user->next;
 389                 hostapd_config_free_eap_user(prev_user);
 390         }
 391
 392         os_free(conf->dump_log_name);
 393         os_free(conf->eap_req_id_text);
 394         os_free(conf->accept_mac);
 395         os_free(conf->deny_mac);
 396         os_free(conf->nas_identifier);
 397         hostapd_config_free_radius(conf->radius->auth_servers,
 398                                    conf->radius->num_auth_servers);
 399         hostapd_config_free_radius(conf->radius->acct_servers,
 400                                    conf->radius->num_acct_servers);
 401         os_free(conf->rsn_preauth_interfaces);
 402         os_free(conf->ctrl_interface);
 403         os_free(conf->ca_cert);
 404         os_free(conf->server_cert);
 405         os_free(conf->private_key);
 406         os_free(conf->private_key_passwd);
 407         os_free(conf->dh_file);
 408         os_free(conf->pac_opaque_encr_key);
 409         os_free(conf->eap_fast_a_id);
 410         os_free(conf->eap_fast_a_id_info);
 411         os_free(conf->eap_sim_db);
 412         os_free(conf->radius_server_clients);
 413         os_free(conf->test_socket);
 414         os_free(conf->radius);
 415         hostapd_config_free_vlan(conf);
 416         if (conf->ssid.dyn_vlan_keys) {
 417                 struct hostapd_ssid *ssid = &conf->ssid;
 418                 size_t i;
 419                 for (i = 0; i <= ssid->max_dyn_vlan_keys; i++) {
 420                         if (ssid->dyn_vlan_keys[i] == NULL)
 421                                 continue;
 422                         hostapd_config_free_wep(ssid->dyn_vlan_keys[i]);
 423                         os_free(ssid->dyn_vlan_keys[i]);
 424                 }
 425                 os_free(ssid->dyn_vlan_keys);
 426                 ssid->dyn_vlan_keys = NULL;
 427         }
 428
 429         os_free(conf->time_zone);
 430
 431 #ifdef CONFIG_IEEE80211R
 432         {
 433                 struct ft_remote_r0kh *r0kh, *r0kh_prev;
 434                 struct ft_remote_r1kh *r1kh, *r1kh_prev;
 435
 436                 r0kh = conf->r0kh_list;
 437                 conf->r0kh_list = NULL;
 438                 while (r0kh) {
 439                         r0kh_prev = r0kh;
 440                         r0kh = r0kh->next;
 441                         os_free(r0kh_prev);
 442                 }
 443
 444                 r1kh = conf->r1kh_list;
 445                 conf->r1kh_list = NULL;
 446                 while (r1kh) {
 447                         r1kh_prev = r1kh;
 448                         r1kh = r1kh->next;
 449                         os_free(r1kh_prev);
 450                 }
 451         }
 452 #endif /* CONFIG_IEEE80211R */
 453
 454 #ifdef CONFIG_WPS
 455         os_free(conf->wps_pin_requests);
 456         os_free(conf->device_name);
 457         os_free(conf->manufacturer);
 458         os_free(conf->model_name);
 459         os_free(conf->model_number);
 460         os_free(conf->serial_number);
 461         os_free(conf->config_methods);
 462         os_free(conf->ap_pin);
 463         os_free(conf->extra_cred);
 464         os_free(conf->ap_settings);
 465         os_free(conf->upnp_iface);
 466         os_free(conf->friendly_name);
 467         os_free(conf->manufacturer_url);
 468         os_free(conf->model_description);
 469         os_free(conf->model_url);
 470         os_free(conf->upc);
 471 #endif /* CONFIG_WPS */
 472
 473         os_free(conf->roaming_consortium);
 474
 475 #ifdef CONFIG_RADIUS_TEST
 476         os_free(conf->dump_msk_file);
 477 #endif /* CONFIG_RADIUS_TEST */
 478 }
 479
 480
 481 /**
 482  * hostapd_config_free - Free hostapd configuration
 483  * @conf: Configuration data from hostapd_config_read().
 484  */
 485 void hostapd_config_free(struct hostapd_config *conf)
 486 {
 487         size_t i;
 488
 489         if (conf == NULL)
 490                 return;
 491
 492         for (i = 0; i < conf->num_bss; i++)
 493                 hostapd_config_free_bss(&conf->bss[i]);
 494         os_free(conf->bss);
 495         os_free(conf->supported_rates);
 496         os_free(conf->basic_rates);
 497
 498         os_free(conf);
 499 }
 500
 501
 502 /**
 503  * hostapd_maclist_found - Find a MAC address from a list
 504  * @list: MAC address list
 505  * @num_entries: Number of addresses in the list
 506  * @addr: Address to search for
 507  * @vlan_id: Buffer for returning VLAN ID or %NULL if not needed
 508  * Returns: 1 if address is in the list or 0 if not.
 509  *
 510  * Perform a binary search for given MAC address from a pre-sorted list.
 511  */
 512 int hostapd_maclist_found(struct mac_acl_entry *list, int num_entries,
 513                           const u8 *addr, int *vlan_id)
 514 {
 515         int start, end, middle, res;
 516
 517         start = 0;
 518         end = num_entries - 1;
 519
 520         while (start <= end) {
 521                 middle = (start + end) / 2;
 522                 res = os_memcmp(list[middle].addr, addr, ETH_ALEN);
 523                 if (res == 0) {
 524                         if (vlan_id)
 525                                 *vlan_id = list[middle].vlan_id;
 526                         return 1;
 527                 }
 528                 if (res < 0)
 529                         start = middle + 1;
 530                 else
 531                         end = middle - 1;
 532         }
 533
 534         return 0;
 535 }
 536
 537
 538 int hostapd_rate_found(int *list, int rate)
 539 {
 540         int i;
 541
 542         if (list == NULL)
 543                 return 0;
 544
 545         for (i = 0; list[i] >= 0; i++)
 546                 if (list[i] == rate)
 547                         return 1;
 548
 549         return 0;
 550 }
 551
 552
 553 const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
 554 {
 555         struct hostapd_vlan *v = vlan;
 556         while (v) {
 557                 if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
 558                         return v->ifname;
 559                 v = v->next;
 560         }
 561         return NULL;
 562 }
 563
 564
 565 const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
 566                            const u8 *addr, const u8 *prev_psk)
 567 {
 568         struct hostapd_wpa_psk *psk;
 569         int next_ok = prev_psk == NULL;
 570
 571         for (psk = conf->ssid.wpa_psk; psk != NULL; psk = psk->next) {
 572                 if (next_ok &&
 573                     (psk->group || os_memcmp(psk->addr, addr, ETH_ALEN) == 0))
 574                         return psk->psk;
 575
 576                 if (psk->psk == prev_psk)
 577                         next_ok = 1;
 578         }
 579
 580         return NULL;
 581 }
 582
 583
 584 const struct hostapd_eap_user *
 585 hostapd_get_eap_user(const struct hostapd_bss_config *conf, const u8 *identity,
 586                      size_t identity_len, int phase2)
 587 {
 588         struct hostapd_eap_user *user = conf->eap_user;
 589
 590 #ifdef CONFIG_WPS
 591         if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
 592             os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
 593                 static struct hostapd_eap_user wsc_enrollee;
 594                 os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
 595                 wsc_enrollee.methods[0].method = eap_server_get_type(
 596                         "WSC", &wsc_enrollee.methods[0].vendor);
 597                 return &wsc_enrollee;
 598         }
 599
 600         if (conf->wps_state && identity_len == WSC_ID_REGISTRAR_LEN &&
 601             os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
 602                 static struct hostapd_eap_user wsc_registrar;
 603                 os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
 604                 wsc_registrar.methods[0].method = eap_server_get_type(
 605                         "WSC", &wsc_registrar.methods[0].vendor);
 606                 wsc_registrar.password = (u8 *) conf->ap_pin;
 607                 wsc_registrar.password_len = conf->ap_pin ?
 608                         os_strlen(conf->ap_pin) : 0;
 609                 return &wsc_registrar;
 610         }
 611 #endif /* CONFIG_WPS */
 612
 613         while (user) {
 614                 if (!phase2 && user->identity == NULL) {
 615                         /* Wildcard match */
 616                         break;
 617                 }
 618
 619                 if (user->phase2 == !!phase2 && user->wildcard_prefix &&
 620                     identity_len >= user->identity_len &&
 621                     os_memcmp(user->identity, identity, user->identity_len) ==
 622                     0) {
 623                         /* Wildcard prefix match */
 624                         break;
 625                 }
 626
 627                 if (user->phase2 == !!phase2 &&
 628                     user->identity_len == identity_len &&
 629                     os_memcmp(user->identity, identity, identity_len) == 0)
 630                         break;
 631                 user = user->next;
 632         }
 633
 634         return user;
 635 }