www.project-moonshot.org Git - mech_eap.orig/blob - src/ap/ieee802_11_auth.c

   1 /*
   2  * hostapd / IEEE 802.11 authentication (ACL)
   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  * Access control list for IEEE 802.11 authentication can uses statically
  15  * configured ACL from configuration files or an external RADIUS server.
  16  * Results from external RADIUS queries are cached to allow faster
  17  * authentication frame processing.
  18  */
  19
  20 #include "utils/includes.h"
  21
  22 #include "utils/common.h"
  23 #include "utils/eloop.h"
  24 #include "radius/radius.h"
  25 #include "radius/radius_client.h"
  26 #include "hostapd.h"
  27 #include "ap_config.h"
  28 #include "ieee802_11.h"
  29 #include "ieee802_11_auth.h"
  30
  31 #define RADIUS_ACL_TIMEOUT 30
  32
  33
  34 struct hostapd_cached_radius_acl {
  35         time_t timestamp;
  36         macaddr addr;
  37         int accepted; /* HOSTAPD_ACL_* */
  38         struct hostapd_cached_radius_acl *next;
  39         u32 session_timeout;
  40         u32 acct_interim_interval;
  41         int vlan_id;
  42 };
  43
  44
  45 struct hostapd_acl_query_data {
  46         time_t timestamp;
  47         u8 radius_id;
  48         macaddr addr;
  49         u8 *auth_msg; /* IEEE 802.11 authentication frame from station */
  50         size_t auth_msg_len;
  51         struct hostapd_acl_query_data *next;
  52 };
  53
  54
  55 #ifndef CONFIG_NO_RADIUS
  56 static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl *acl_cache)
  57 {
  58         struct hostapd_cached_radius_acl *prev;
  59
  60         while (acl_cache) {
  61                 prev = acl_cache;
  62                 acl_cache = acl_cache->next;
  63                 os_free(prev);
  64         }
  65 }
  66
  67
  68 static int hostapd_acl_cache_get(struct hostapd_data *hapd, const u8 *addr,
  69                                  u32 *session_timeout,
  70                                  u32 *acct_interim_interval, int *vlan_id)
  71 {
  72         struct hostapd_cached_radius_acl *entry;
  73         time_t now;
  74
  75         time(&now);
  76         entry = hapd->acl_cache;
  77
  78         while (entry) {
  79                 if (os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
  80                         if (now - entry->timestamp > RADIUS_ACL_TIMEOUT)
  81                                 return -1; /* entry has expired */
  82                         if (entry->accepted == HOSTAPD_ACL_ACCEPT_TIMEOUT)
  83                                 if (session_timeout)
  84                                         *session_timeout =
  85                                                 entry->session_timeout;
  86                         if (acct_interim_interval)
  87                                 *acct_interim_interval =
  88                                         entry->acct_interim_interval;
  89                         if (vlan_id)
  90                                 *vlan_id = entry->vlan_id;
  91                         return entry->accepted;
  92                 }
  93
  94                 entry = entry->next;
  95         }
  96
  97         return -1;
  98 }
  99 #endif /* CONFIG_NO_RADIUS */
 100
 101
 102 static void hostapd_acl_query_free(struct hostapd_acl_query_data *query)
 103 {
 104         if (query == NULL)
 105                 return;
 106         os_free(query->auth_msg);
 107         os_free(query);
 108 }
 109
 110
 111 #ifndef CONFIG_NO_RADIUS
 112 static int hostapd_radius_acl_query(struct hostapd_data *hapd, const u8 *addr,
 113                                     struct hostapd_acl_query_data *query)
 114 {
 115         struct radius_msg *msg;
 116         char buf[128];
 117
 118         query->radius_id = radius_client_get_id(hapd->radius);
 119         msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id);
 120         if (msg == NULL)
 121                 return -1;
 122
 123         radius_msg_make_authenticator(msg, addr, ETH_ALEN);
 124
 125         os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr));
 126         if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf,
 127                                  os_strlen(buf))) {
 128                 wpa_printf(MSG_DEBUG, "Could not add User-Name");
 129                 goto fail;
 130         }
 131
 132         if (!radius_msg_add_attr_user_password(
 133                     msg, (u8 *) buf, os_strlen(buf),
 134                     hapd->conf->radius->auth_server->shared_secret,
 135                     hapd->conf->radius->auth_server->shared_secret_len)) {
 136                 wpa_printf(MSG_DEBUG, "Could not add User-Password");
 137                 goto fail;
 138         }
 139
 140         if (hapd->conf->own_ip_addr.af == AF_INET &&
 141             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
 142                                  (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
 143                 wpa_printf(MSG_DEBUG, "Could not add NAS-IP-Address");
 144                 goto fail;
 145         }
 146
 147 #ifdef CONFIG_IPV6
 148         if (hapd->conf->own_ip_addr.af == AF_INET6 &&
 149             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
 150                                  (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
 151                 wpa_printf(MSG_DEBUG, "Could not add NAS-IPv6-Address");
 152                 goto fail;
 153         }
 154 #endif /* CONFIG_IPV6 */
 155
 156         if (hapd->conf->nas_identifier &&
 157             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
 158                                  (u8 *) hapd->conf->nas_identifier,
 159                                  os_strlen(hapd->conf->nas_identifier))) {
 160                 wpa_printf(MSG_DEBUG, "Could not add NAS-Identifier");
 161                 goto fail;
 162         }
 163
 164         os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
 165                     MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
 166         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
 167                                  (u8 *) buf, os_strlen(buf))) {
 168                 wpa_printf(MSG_DEBUG, "Could not add Called-Station-Id");
 169                 goto fail;
 170         }
 171
 172         os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
 173                     MAC2STR(addr));
 174         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
 175                                  (u8 *) buf, os_strlen(buf))) {
 176                 wpa_printf(MSG_DEBUG, "Could not add Calling-Station-Id");
 177                 goto fail;
 178         }
 179
 180         if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
 181                                        RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
 182                 wpa_printf(MSG_DEBUG, "Could not add NAS-Port-Type");
 183                 goto fail;
 184         }
 185
 186         os_snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
 187         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
 188                                  (u8 *) buf, os_strlen(buf))) {
 189                 wpa_printf(MSG_DEBUG, "Could not add Connect-Info");
 190                 goto fail;
 191         }
 192
 193         radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr);
 194         return 0;
 195
 196  fail:
 197         radius_msg_free(msg);
 198         return -1;
 199 }
 200 #endif /* CONFIG_NO_RADIUS */
 201
 202
 203 /**
 204  * hostapd_allowed_address - Check whether a specified STA can be authenticated
 205  * @hapd: hostapd BSS data
 206  * @addr: MAC address of the STA
 207  * @msg: Authentication message
 208  * @len: Length of msg in octets
 209  * @session_timeout: Buffer for returning session timeout (from RADIUS)
 210  * @acct_interim_interval: Buffer for returning account interval (from RADIUS)
 211  * @vlan_id: Buffer for returning VLAN ID
 212  * Returns: HOSTAPD_ACL_ACCEPT, HOSTAPD_ACL_REJECT, or HOSTAPD_ACL_PENDING
 213  */
 214 int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
 215                             const u8 *msg, size_t len, u32 *session_timeout,
 216                             u32 *acct_interim_interval, int *vlan_id)
 217 {
 218         if (session_timeout)
 219                 *session_timeout = 0;
 220         if (acct_interim_interval)
 221                 *acct_interim_interval = 0;
 222         if (vlan_id)
 223                 *vlan_id = 0;
 224
 225         if (hostapd_maclist_found(hapd->conf->accept_mac,
 226                                   hapd->conf->num_accept_mac, addr, vlan_id))
 227                 return HOSTAPD_ACL_ACCEPT;
 228
 229         if (hostapd_maclist_found(hapd->conf->deny_mac,
 230                                   hapd->conf->num_deny_mac, addr, vlan_id))
 231                 return HOSTAPD_ACL_REJECT;
 232
 233         if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
 234                 return HOSTAPD_ACL_ACCEPT;
 235         if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
 236                 return HOSTAPD_ACL_REJECT;
 237
 238         if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
 239 #ifdef CONFIG_NO_RADIUS
 240                 return HOSTAPD_ACL_REJECT;
 241 #else /* CONFIG_NO_RADIUS */
 242                 struct hostapd_acl_query_data *query;
 243
 244                 /* Check whether ACL cache has an entry for this station */
 245                 int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
 246                                                 acct_interim_interval,
 247                                                 vlan_id);
 248                 if (res == HOSTAPD_ACL_ACCEPT ||
 249                     res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
 250                         return res;
 251                 if (res == HOSTAPD_ACL_REJECT)
 252                         return HOSTAPD_ACL_REJECT;
 253
 254                 query = hapd->acl_queries;
 255                 while (query) {
 256                         if (os_memcmp(query->addr, addr, ETH_ALEN) == 0) {
 257                                 /* pending query in RADIUS retransmit queue;
 258                                  * do not generate a new one */
 259                                 return HOSTAPD_ACL_PENDING;
 260                         }
 261                         query = query->next;
 262                 }
 263
 264                 if (!hapd->conf->radius->auth_server)
 265                         return HOSTAPD_ACL_REJECT;
 266
 267                 /* No entry in the cache - query external RADIUS server */
 268                 query = os_zalloc(sizeof(*query));
 269                 if (query == NULL) {
 270                         wpa_printf(MSG_ERROR, "malloc for query data failed");
 271                         return HOSTAPD_ACL_REJECT;
 272                 }
 273                 time(&query->timestamp);
 274                 os_memcpy(query->addr, addr, ETH_ALEN);
 275                 if (hostapd_radius_acl_query(hapd, addr, query)) {
 276                         wpa_printf(MSG_DEBUG, "Failed to send Access-Request "
 277                                    "for ACL query.");
 278                         hostapd_acl_query_free(query);
 279                         return HOSTAPD_ACL_REJECT;
 280                 }
 281
 282                 query->auth_msg = os_malloc(len);
 283                 if (query->auth_msg == NULL) {
 284                         wpa_printf(MSG_ERROR, "Failed to allocate memory for "
 285                                    "auth frame.");
 286                         hostapd_acl_query_free(query);
 287                         return HOSTAPD_ACL_REJECT;
 288                 }
 289                 os_memcpy(query->auth_msg, msg, len);
 290                 query->auth_msg_len = len;
 291                 query->next = hapd->acl_queries;
 292                 hapd->acl_queries = query;
 293
 294                 /* Queued data will be processed in hostapd_acl_recv_radius()
 295                  * when RADIUS server replies to the sent Access-Request. */
 296                 return HOSTAPD_ACL_PENDING;
 297 #endif /* CONFIG_NO_RADIUS */
 298         }
 299
 300         return HOSTAPD_ACL_REJECT;
 301 }
 302
 303
 304 #ifndef CONFIG_NO_RADIUS
 305 static void hostapd_acl_expire_cache(struct hostapd_data *hapd, time_t now)
 306 {
 307         struct hostapd_cached_radius_acl *prev, *entry, *tmp;
 308
 309         prev = NULL;
 310         entry = hapd->acl_cache;
 311
 312         while (entry) {
 313                 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
 314                         wpa_printf(MSG_DEBUG, "Cached ACL entry for " MACSTR
 315                                    " has expired.", MAC2STR(entry->addr));
 316                         if (prev)
 317                                 prev->next = entry->next;
 318                         else
 319                                 hapd->acl_cache = entry->next;
 320 #ifdef CONFIG_DRIVER_RADIUS_ACL
 321                         hapd->drv.set_radius_acl_expire(hapd, entry->addr);
 322 #endif /* CONFIG_DRIVER_RADIUS_ACL */
 323                         tmp = entry;
 324                         entry = entry->next;
 325                         os_free(tmp);
 326                         continue;
 327                 }
 328
 329                 prev = entry;
 330                 entry = entry->next;
 331         }
 332 }
 333
 334
 335 static void hostapd_acl_expire_queries(struct hostapd_data *hapd, time_t now)
 336 {
 337         struct hostapd_acl_query_data *prev, *entry, *tmp;
 338
 339         prev = NULL;
 340         entry = hapd->acl_queries;
 341
 342         while (entry) {
 343                 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
 344                         wpa_printf(MSG_DEBUG, "ACL query for " MACSTR
 345                                    " has expired.", MAC2STR(entry->addr));
 346                         if (prev)
 347                                 prev->next = entry->next;
 348                         else
 349                                 hapd->acl_queries = entry->next;
 350
 351                         tmp = entry;
 352                         entry = entry->next;
 353                         hostapd_acl_query_free(tmp);
 354                         continue;
 355                 }
 356
 357                 prev = entry;
 358                 entry = entry->next;
 359         }
 360 }
 361
 362
 363 /**
 364  * hostapd_acl_expire - ACL cache expiration callback
 365  * @eloop_ctx: struct hostapd_data *
 366  * @timeout_ctx: Not used
 367  */
 368 static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx)
 369 {
 370         struct hostapd_data *hapd = eloop_ctx;
 371         time_t now;
 372
 373         time(&now);
 374         hostapd_acl_expire_cache(hapd, now);
 375         hostapd_acl_expire_queries(hapd, now);
 376
 377         eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
 378 }
 379
 380
 381 /**
 382  * hostapd_acl_recv_radius - Process incoming RADIUS Authentication messages
 383  * @msg: RADIUS response message
 384  * @req: RADIUS request message
 385  * @shared_secret: RADIUS shared secret
 386  * @shared_secret_len: Length of shared_secret in octets
 387  * @data: Context data (struct hostapd_data *)
 388  * Returns: RADIUS_RX_PROCESSED if RADIUS message was a reply to ACL query (and
 389  * was processed here) or RADIUS_RX_UNKNOWN if not.
 390  */
 391 static RadiusRxResult
 392 hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
 393                         const u8 *shared_secret, size_t shared_secret_len,
 394                         void *data)
 395 {
 396         struct hostapd_data *hapd = data;
 397         struct hostapd_acl_query_data *query, *prev;
 398         struct hostapd_cached_radius_acl *cache;
 399         struct radius_hdr *hdr = radius_msg_get_hdr(msg);
 400
 401         query = hapd->acl_queries;
 402         prev = NULL;
 403         while (query) {
 404                 if (query->radius_id == hdr->identifier)
 405                         break;
 406                 prev = query;
 407                 query = query->next;
 408         }
 409         if (query == NULL)
 410                 return RADIUS_RX_UNKNOWN;
 411
 412         wpa_printf(MSG_DEBUG, "Found matching Access-Request for RADIUS "
 413                    "message (id=%d)", query->radius_id);
 414
 415         if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
 416                 wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have "
 417                            "correct authenticator - dropped\n");
 418                 return RADIUS_RX_INVALID_AUTHENTICATOR;
 419         }
 420
 421         if (hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
 422             hdr->code != RADIUS_CODE_ACCESS_REJECT) {
 423                 wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL "
 424                            "query", hdr->code);
 425                 return RADIUS_RX_UNKNOWN;
 426         }
 427
 428         /* Insert Accept/Reject info into ACL cache */
 429         cache = os_zalloc(sizeof(*cache));
 430         if (cache == NULL) {
 431                 wpa_printf(MSG_DEBUG, "Failed to add ACL cache entry");
 432                 goto done;
 433         }
 434         time(&cache->timestamp);
 435         os_memcpy(cache->addr, query->addr, sizeof(cache->addr));
 436         if (hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
 437                 if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
 438                                               &cache->session_timeout) == 0)
 439                         cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
 440                 else
 441                         cache->accepted = HOSTAPD_ACL_ACCEPT;
 442
 443                 if (radius_msg_get_attr_int32(
 444                             msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
 445                             &cache->acct_interim_interval) == 0 &&
 446                     cache->acct_interim_interval < 60) {
 447                         wpa_printf(MSG_DEBUG, "Ignored too small "
 448                                    "Acct-Interim-Interval %d for STA " MACSTR,
 449                                    cache->acct_interim_interval,
 450                                    MAC2STR(query->addr));
 451                         cache->acct_interim_interval = 0;
 452                 }
 453
 454                 cache->vlan_id = radius_msg_get_vlanid(msg);
 455         } else
 456                 cache->accepted = HOSTAPD_ACL_REJECT;
 457         cache->next = hapd->acl_cache;
 458         hapd->acl_cache = cache;
 459
 460 #ifdef CONFIG_DRIVER_RADIUS_ACL
 461         hapd->drv.set_radius_acl_auth(hapd, query->addr, cache->accepted,
 462                                       cache->session_timeout);
 463 #else /* CONFIG_DRIVER_RADIUS_ACL */
 464 #ifdef NEED_AP_MLME
 465         /* Re-send original authentication frame for 802.11 processing */
 466         wpa_printf(MSG_DEBUG, "Re-sending authentication frame after "
 467                    "successful RADIUS ACL query");
 468         ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len, NULL);
 469 #endif /* NEED_AP_MLME */
 470 #endif /* CONFIG_DRIVER_RADIUS_ACL */
 471
 472  done:
 473         if (prev == NULL)
 474                 hapd->acl_queries = query->next;
 475         else
 476                 prev->next = query->next;
 477
 478         hostapd_acl_query_free(query);
 479
 480         return RADIUS_RX_PROCESSED;
 481 }
 482 #endif /* CONFIG_NO_RADIUS */
 483
 484
 485 /**
 486  * hostapd_acl_init: Initialize IEEE 802.11 ACL
 487  * @hapd: hostapd BSS data
 488  * Returns: 0 on success, -1 on failure
 489  */
 490 int hostapd_acl_init(struct hostapd_data *hapd)
 491 {
 492 #ifndef CONFIG_NO_RADIUS
 493         if (radius_client_register(hapd->radius, RADIUS_AUTH,
 494                                    hostapd_acl_recv_radius, hapd))
 495                 return -1;
 496
 497         eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
 498 #endif /* CONFIG_NO_RADIUS */
 499
 500         return 0;
 501 }
 502
 503
 504 /**
 505  * hostapd_acl_deinit - Deinitialize IEEE 802.11 ACL
 506  * @hapd: hostapd BSS data
 507  */
 508 void hostapd_acl_deinit(struct hostapd_data *hapd)
 509 {
 510         struct hostapd_acl_query_data *query, *prev;
 511
 512 #ifndef CONFIG_NO_RADIUS
 513         eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);
 514
 515         hostapd_acl_cache_free(hapd->acl_cache);
 516 #endif /* CONFIG_NO_RADIUS */
 517
 518         query = hapd->acl_queries;
 519         while (query) {
 520                 prev = query;
 521                 query = query->next;
 522                 hostapd_acl_query_free(prev);
 523         }
 524 }