hostapd/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 "includes.h"
  16
  17 #include "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.h"
  25 #include "sta_info.h"
  26 #include "config.h"
  27
  28
  29 extern struct wpa_driver_ops *wpa_drivers[];
  30
  31
  32 static void hostapd_config_free_vlan(struct hostapd_bss_config *bss)
  33 {
  34         struct hostapd_vlan *vlan, *prev;
  35
  36         vlan = bss->vlan;
  37         prev = NULL;
  38         while (vlan) {
  39                 prev = vlan;
  40                 vlan = vlan->next;
  41                 os_free(prev);
  42         }
  43
  44         bss->vlan = NULL;
  45 }
  46
  47
  48 void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
  49 {
  50         bss->logger_syslog_level = HOSTAPD_LEVEL_INFO;
  51         bss->logger_stdout_level = HOSTAPD_LEVEL_INFO;
  52         bss->logger_syslog = (unsigned int) -1;
  53         bss->logger_stdout = (unsigned int) -1;
  54
  55         bss->auth_algs = WPA_AUTH_ALG_OPEN | WPA_AUTH_ALG_SHARED;
  56
  57         bss->wep_rekeying_period = 300;
  58         /* use key0 in individual key and key1 in broadcast key */
  59         bss->broadcast_key_idx_min = 1;
  60         bss->broadcast_key_idx_max = 2;
  61         bss->eap_reauth_period = 3600;
  62
  63         bss->wpa_group_rekey = 600;
  64         bss->wpa_gmk_rekey = 86400;
  65         bss->wpa_key_mgmt = WPA_KEY_MGMT_PSK;
  66         bss->wpa_pairwise = WPA_CIPHER_TKIP;
  67         bss->wpa_group = WPA_CIPHER_TKIP;
  68         bss->rsn_pairwise = 0;
  69
  70         bss->max_num_sta = MAX_STA_COUNT;
  71
  72         bss->dtim_period = 2;
  73
  74         bss->radius_server_auth_port = 1812;
  75         bss->ap_max_inactivity = AP_MAX_INACTIVITY;
  76         bss->eapol_version = EAPOL_VERSION;
  77
  78         bss->max_listen_interval = 65535;
  79
  80 #ifdef CONFIG_IEEE80211W
  81         bss->assoc_sa_query_max_timeout = 1000;
  82         bss->assoc_sa_query_retry_timeout = 201;
  83 #endif /* CONFIG_IEEE80211W */
  84 #ifdef EAP_SERVER_FAST
  85          /* both anonymous and authenticated provisioning */
  86         bss->eap_fast_prov = 3;
  87         bss->pac_key_lifetime = 7 * 24 * 60 * 60;
  88         bss->pac_key_refresh_time = 1 * 24 * 60 * 60;
  89 #endif /* EAP_SERVER_FAST */
  90 }
  91
  92
  93 struct hostapd_config * hostapd_config_defaults(void)
  94 {
  95         struct hostapd_config *conf;
  96         struct hostapd_bss_config *bss;
  97         int i;
  98         const int aCWmin = 15, aCWmax = 1024;
  99         const struct hostapd_wmm_ac_params ac_bk =
 100                 { aCWmin, aCWmax, 7, 0, 0 }; /* background traffic */
 101         const struct hostapd_wmm_ac_params ac_be =
 102                 { aCWmin, aCWmax, 3, 0, 0 }; /* best effort traffic */
 103         const struct hostapd_wmm_ac_params ac_vi = /* video traffic */
 104                 { aCWmin >> 1, aCWmin, 2, 3000 / 32, 1 };
 105         const struct hostapd_wmm_ac_params ac_vo = /* voice traffic */
 106                 { aCWmin >> 2, aCWmin >> 1, 2, 1500 / 32, 1 };
 107
 108         conf = os_zalloc(sizeof(*conf));
 109         bss = os_zalloc(sizeof(*bss));
 110         if (conf == NULL || bss == NULL) {
 111                 wpa_printf(MSG_ERROR, "Failed to allocate memory for "
 112                            "configuration data.");
 113                 os_free(conf);
 114                 os_free(bss);
 115                 return NULL;
 116         }
 117
 118         /* set default driver based on configuration */
 119         conf->driver = wpa_drivers[0];
 120         if (conf->driver == NULL) {
 121                 wpa_printf(MSG_ERROR, "No driver wrappers registered!");
 122                 os_free(conf);
 123                 os_free(bss);
 124                 return NULL;
 125         }
 126
 127         bss->radius = os_zalloc(sizeof(*bss->radius));
 128         if (bss->radius == NULL) {
 129                 os_free(conf);
 130                 os_free(bss);
 131                 return NULL;
 132         }
 133
 134         hostapd_config_defaults_bss(bss);
 135
 136         conf->num_bss = 1;
 137         conf->bss = bss;
 138
 139         conf->beacon_int = 100;
 140         conf->rts_threshold = -1; /* use driver default: 2347 */
 141         conf->fragm_threshold = -1; /* user driver default: 2346 */
 142         conf->send_probe_response = 1;
 143
 144         for (i = 0; i < NUM_TX_QUEUES; i++)
 145                 conf->tx_queue[i].aifs = -1; /* use hw default */
 146
 147         conf->wmm_ac_params[0] = ac_be;
 148         conf->wmm_ac_params[1] = ac_bk;
 149         conf->wmm_ac_params[2] = ac_vi;
 150         conf->wmm_ac_params[3] = ac_vo;
 151
 152         conf->ht_capab = HT_CAP_INFO_SMPS_DISABLED;
 153
 154         return conf;
 155 }
 156
 157
 158 int hostapd_mac_comp(const void *a, const void *b)
 159 {
 160         return os_memcmp(a, b, sizeof(macaddr));
 161 }
 162
 163
 164 int hostapd_mac_comp_empty(const void *a)
 165 {
 166         macaddr empty = { 0 };
 167         return os_memcmp(a, empty, sizeof(macaddr));
 168 }
 169
 170
 171 static int hostapd_config_read_wpa_psk(const char *fname,
 172                                        struct hostapd_ssid *ssid)
 173 {
 174         FILE *f;
 175         char buf[128], *pos;
 176         int line = 0, ret = 0, len, ok;
 177         u8 addr[ETH_ALEN];
 178         struct hostapd_wpa_psk *psk;
 179
 180         if (!fname)
 181                 return 0;
 182
 183         f = fopen(fname, "r");
 184         if (!f) {
 185                 wpa_printf(MSG_ERROR, "WPA PSK file '%s' not found.", fname);
 186                 return -1;
 187         }
 188
 189         while (fgets(buf, sizeof(buf), f)) {
 190                 line++;
 191
 192                 if (buf[0] == '#')
 193                         continue;
 194                 pos = buf;
 195                 while (*pos != '\0') {
 196                         if (*pos == '\n') {
 197                                 *pos = '\0';
 198                                 break;
 199                         }
 200                         pos++;
 201                 }
 202                 if (buf[0] == '\0')
 203                         continue;
 204
 205                 if (hwaddr_aton(buf, addr)) {
 206                         wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
 207                                    "line %d in '%s'", buf, line, fname);
 208                         ret = -1;
 209                         break;
 210                 }
 211
 212                 psk = os_zalloc(sizeof(*psk));
 213                 if (psk == NULL) {
 214                         wpa_printf(MSG_ERROR, "WPA PSK allocation failed");
 215                         ret = -1;
 216                         break;
 217                 }
 218                 if (is_zero_ether_addr(addr))
 219                         psk->group = 1;
 220                 else
 221                         os_memcpy(psk->addr, addr, ETH_ALEN);
 222
 223                 pos = buf + 17;
 224                 if (*pos == '\0') {
 225                         wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
 226                                    line, fname);
 227                         os_free(psk);
 228                         ret = -1;
 229                         break;
 230                 }
 231                 pos++;
 232
 233                 ok = 0;
 234                 len = os_strlen(pos);
 235                 if (len == 64 && hexstr2bin(pos, psk->psk, PMK_LEN) == 0)
 236                         ok = 1;
 237                 else if (len >= 8 && len < 64) {
 238                         pbkdf2_sha1(pos, ssid->ssid, ssid->ssid_len,
 239                                     4096, psk->psk, PMK_LEN);
 240                         ok = 1;
 241                 }
 242                 if (!ok) {
 243                         wpa_printf(MSG_ERROR, "Invalid PSK '%s' on line %d in "
 244                                    "'%s'", pos, line, fname);
 245                         os_free(psk);
 246                         ret = -1;
 247                         break;
 248                 }
 249
 250                 psk->next = ssid->wpa_psk;
 251                 ssid->wpa_psk = psk;
 252         }
 253
 254         fclose(f);
 255
 256         return ret;
 257 }
 258
 259
 260 static int hostapd_derive_psk(struct hostapd_ssid *ssid)
 261 {
 262         ssid->wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
 263         if (ssid->wpa_psk == NULL) {
 264                 wpa_printf(MSG_ERROR, "Unable to alloc space for PSK");
 265                 return -1;
 266         }
 267         wpa_hexdump_ascii(MSG_DEBUG, "SSID",
 268                           (u8 *) ssid->ssid, ssid->ssid_len);
 269         wpa_hexdump_ascii_key(MSG_DEBUG, "PSK (ASCII passphrase)",
 270                               (u8 *) ssid->wpa_passphrase,
 271                               os_strlen(ssid->wpa_passphrase));
 272         pbkdf2_sha1(ssid->wpa_passphrase,
 273                     ssid->ssid, ssid->ssid_len,
 274                     4096, ssid->wpa_psk->psk, PMK_LEN);
 275         wpa_hexdump_key(MSG_DEBUG, "PSK (from passphrase)",
 276                         ssid->wpa_psk->psk, PMK_LEN);
 277         return 0;
 278 }
 279
 280
 281 int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf)
 282 {
 283         struct hostapd_ssid *ssid = &conf->ssid;
 284
 285         if (ssid->wpa_passphrase != NULL) {
 286                 if (ssid->wpa_psk != NULL) {
 287                         wpa_printf(MSG_DEBUG, "Using pre-configured WPA PSK "
 288                                    "instead of passphrase");
 289                 } else {
 290                         wpa_printf(MSG_DEBUG, "Deriving WPA PSK based on "
 291                                    "passphrase");
 292                         if (hostapd_derive_psk(ssid) < 0)
 293                                 return -1;
 294                 }
 295                 ssid->wpa_psk->group = 1;
 296         }
 297
 298         if (ssid->wpa_psk_file) {
 299                 if (hostapd_config_read_wpa_psk(ssid->wpa_psk_file,
 300                                                 &conf->ssid))
 301                         return -1;
 302         }
 303
 304         return 0;
 305 }
 306
 307
 308 int hostapd_wep_key_cmp(struct hostapd_wep_keys *a, struct hostapd_wep_keys *b)
 309 {
 310         int i;
 311
 312         if (a->idx != b->idx || a->default_len != b->default_len)
 313                 return 1;
 314         for (i = 0; i < NUM_WEP_KEYS; i++)
 315                 if (a->len[i] != b->len[i] ||
 316                     os_memcmp(a->key[i], b->key[i], a->len[i]) != 0)
 317                         return 1;
 318         return 0;
 319 }
 320
 321
 322 static void hostapd_config_free_radius(struct hostapd_radius_server *servers,
 323                                        int num_servers)
 324 {
 325         int i;
 326
 327         for (i = 0; i < num_servers; i++) {
 328                 os_free(servers[i].shared_secret);
 329         }
 330         os_free(servers);
 331 }
 332
 333
 334 static void hostapd_config_free_eap_user(struct hostapd_eap_user *user)
 335 {
 336         os_free(user->identity);
 337         os_free(user->password);
 338         os_free(user);
 339 }
 340
 341
 342 static void hostapd_config_free_wep(struct hostapd_wep_keys *keys)
 343 {
 344         int i;
 345         for (i = 0; i < NUM_WEP_KEYS; i++) {
 346                 os_free(keys->key[i]);
 347                 keys->key[i] = NULL;
 348         }
 349 }
 350
 351
 352 static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
 353 {
 354         struct hostapd_wpa_psk *psk, *prev;
 355         struct hostapd_eap_user *user, *prev_user;
 356
 357         if (conf == NULL)
 358                 return;
 359
 360         psk = conf->ssid.wpa_psk;
 361         while (psk) {
 362                 prev = psk;
 363                 psk = psk->next;
 364                 os_free(prev);
 365         }
 366
 367         os_free(conf->ssid.wpa_passphrase);
 368         os_free(conf->ssid.wpa_psk_file);
 369 #ifdef CONFIG_FULL_DYNAMIC_VLAN
 370         os_free(conf->ssid.vlan_tagged_interface);
 371 #endif /* CONFIG_FULL_DYNAMIC_VLAN */
 372
 373         user = conf->eap_user;
 374         while (user) {
 375                 prev_user = user;
 376                 user = user->next;
 377                 hostapd_config_free_eap_user(prev_user);
 378         }
 379
 380         os_free(conf->dump_log_name);
 381         os_free(conf->eap_req_id_text);
 382         os_free(conf->accept_mac);
 383         os_free(conf->deny_mac);
 384         os_free(conf->nas_identifier);
 385         hostapd_config_free_radius(conf->radius->auth_servers,
 386                                    conf->radius->num_auth_servers);
 387         hostapd_config_free_radius(conf->radius->acct_servers,
 388                                    conf->radius->num_acct_servers);
 389         os_free(conf->rsn_preauth_interfaces);
 390         os_free(conf->ctrl_interface);
 391         os_free(conf->ca_cert);
 392         os_free(conf->server_cert);
 393         os_free(conf->private_key);
 394         os_free(conf->private_key_passwd);
 395         os_free(conf->dh_file);
 396         os_free(conf->pac_opaque_encr_key);
 397         os_free(conf->eap_fast_a_id);
 398         os_free(conf->eap_fast_a_id_info);
 399         os_free(conf->eap_sim_db);
 400         os_free(conf->radius_server_clients);
 401         os_free(conf->test_socket);
 402         os_free(conf->radius);
 403         hostapd_config_free_vlan(conf);
 404         if (conf->ssid.dyn_vlan_keys) {
 405                 struct hostapd_ssid *ssid = &conf->ssid;
 406                 size_t i;
 407                 for (i = 0; i <= ssid->max_dyn_vlan_keys; i++) {
 408                         if (ssid->dyn_vlan_keys[i] == NULL)
 409                                 continue;
 410                         hostapd_config_free_wep(ssid->dyn_vlan_keys[i]);
 411                         os_free(ssid->dyn_vlan_keys[i]);
 412                 }
 413                 os_free(ssid->dyn_vlan_keys);
 414                 ssid->dyn_vlan_keys = NULL;
 415         }
 416
 417 #ifdef CONFIG_IEEE80211R
 418         {
 419                 struct ft_remote_r0kh *r0kh, *r0kh_prev;
 420                 struct ft_remote_r1kh *r1kh, *r1kh_prev;
 421
 422                 r0kh = conf->r0kh_list;
 423                 conf->r0kh_list = NULL;
 424                 while (r0kh) {
 425                         r0kh_prev = r0kh;
 426                         r0kh = r0kh->next;
 427                         os_free(r0kh_prev);
 428                 }
 429
 430                 r1kh = conf->r1kh_list;
 431                 conf->r1kh_list = NULL;
 432                 while (r1kh) {
 433                         r1kh_prev = r1kh;
 434                         r1kh = r1kh->next;
 435                         os_free(r1kh_prev);
 436                 }
 437         }
 438 #endif /* CONFIG_IEEE80211R */
 439
 440 #ifdef CONFIG_WPS
 441         os_free(conf->wps_pin_requests);
 442         os_free(conf->device_name);
 443         os_free(conf->manufacturer);
 444         os_free(conf->model_name);
 445         os_free(conf->model_number);
 446         os_free(conf->serial_number);
 447         os_free(conf->device_type);
 448         os_free(conf->config_methods);
 449         os_free(conf->ap_pin);
 450         os_free(conf->extra_cred);
 451         os_free(conf->ap_settings);
 452         os_free(conf->upnp_iface);
 453         os_free(conf->friendly_name);
 454         os_free(conf->manufacturer_url);
 455         os_free(conf->model_description);
 456         os_free(conf->model_url);
 457         os_free(conf->upc);
 458 #endif /* CONFIG_WPS */
 459 }
 460
 461
 462 /**
 463  * hostapd_config_free - Free hostapd configuration
 464  * @conf: Configuration data from hostapd_config_read().
 465  */
 466 void hostapd_config_free(struct hostapd_config *conf)
 467 {
 468         size_t i;
 469
 470         if (conf == NULL)
 471                 return;
 472
 473         for (i = 0; i < conf->num_bss; i++)
 474                 hostapd_config_free_bss(&conf->bss[i]);
 475         os_free(conf->bss);
 476         os_free(conf->supported_rates);
 477         os_free(conf->basic_rates);
 478
 479         os_free(conf);
 480 }
 481
 482
 483 /**
 484  * hostapd_maclist_found - Find a MAC address from a list
 485  * @list: MAC address list
 486  * @num_entries: Number of addresses in the list
 487  * @addr: Address to search for
 488  * @vlan_id: Buffer for returning VLAN ID or %NULL if not needed
 489  * Returns: 1 if address is in the list or 0 if not.
 490  *
 491  * Perform a binary search for given MAC address from a pre-sorted list.
 492  */
 493 int hostapd_maclist_found(struct mac_acl_entry *list, int num_entries,
 494                           const u8 *addr, int *vlan_id)
 495 {
 496         int start, end, middle, res;
 497
 498         start = 0;
 499         end = num_entries - 1;
 500
 501         while (start <= end) {
 502                 middle = (start + end) / 2;
 503                 res = os_memcmp(list[middle].addr, addr, ETH_ALEN);
 504                 if (res == 0) {
 505                         if (vlan_id)
 506                                 *vlan_id = list[middle].vlan_id;
 507                         return 1;
 508                 }
 509                 if (res < 0)
 510                         start = middle + 1;
 511                 else
 512                         end = middle - 1;
 513         }
 514
 515         return 0;
 516 }
 517
 518
 519 int hostapd_rate_found(int *list, int rate)
 520 {
 521         int i;
 522
 523         if (list == NULL)
 524                 return 0;
 525
 526         for (i = 0; list[i] >= 0; i++)
 527                 if (list[i] == rate)
 528                         return 1;
 529
 530         return 0;
 531 }
 532
 533
 534 const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
 535 {
 536         struct hostapd_vlan *v = vlan;
 537         while (v) {
 538                 if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
 539                         return v->ifname;
 540                 v = v->next;
 541         }
 542         return NULL;
 543 }
 544
 545
 546 const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
 547                            const u8 *addr, const u8 *prev_psk)
 548 {
 549         struct hostapd_wpa_psk *psk;
 550         int next_ok = prev_psk == NULL;
 551
 552         for (psk = conf->ssid.wpa_psk; psk != NULL; psk = psk->next) {
 553                 if (next_ok &&
 554                     (psk->group || os_memcmp(psk->addr, addr, ETH_ALEN) == 0))
 555                         return psk->psk;
 556
 557                 if (psk->psk == prev_psk)
 558                         next_ok = 1;
 559         }
 560
 561         return NULL;
 562 }
 563
 564
 565 const struct hostapd_eap_user *
 566 hostapd_get_eap_user(const struct hostapd_bss_config *conf, const u8 *identity,
 567                      size_t identity_len, int phase2)
 568 {
 569         struct hostapd_eap_user *user = conf->eap_user;
 570
 571 #ifdef CONFIG_WPS
 572         if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
 573             os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
 574                 static struct hostapd_eap_user wsc_enrollee;
 575                 os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
 576                 wsc_enrollee.methods[0].method = eap_server_get_type(
 577                         "WSC", &wsc_enrollee.methods[0].vendor);
 578                 return &wsc_enrollee;
 579         }
 580
 581         if (conf->wps_state && conf->ap_pin &&
 582             identity_len == WSC_ID_REGISTRAR_LEN &&
 583             os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
 584                 static struct hostapd_eap_user wsc_registrar;
 585                 os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
 586                 wsc_registrar.methods[0].method = eap_server_get_type(
 587                         "WSC", &wsc_registrar.methods[0].vendor);
 588                 wsc_registrar.password = (u8 *) conf->ap_pin;
 589                 wsc_registrar.password_len = os_strlen(conf->ap_pin);
 590                 return &wsc_registrar;
 591         }
 592 #endif /* CONFIG_WPS */
 593
 594         while (user) {
 595                 if (!phase2 && user->identity == NULL) {
 596                         /* Wildcard match */
 597                         break;
 598                 }
 599
 600                 if (user->phase2 == !!phase2 && user->wildcard_prefix &&
 601                     identity_len >= user->identity_len &&
 602                     os_memcmp(user->identity, identity, user->identity_len) ==
 603                     0) {
 604                         /* Wildcard prefix match */
 605                         break;
 606                 }
 607
 608                 if (user->phase2 == !!phase2 &&
 609                     user->identity_len == identity_len &&
 610                     os_memcmp(user->identity, identity, identity_len) == 0)
 611                         break;
 612                 user = user->next;
 613         }
 614
 615         return user;
 616 }