hostapd/ieee802_11_auth.c

   1 /*
   2  * hostapd / IEEE 802.11 authentication (ACL)
   3  * Copyright (c) 2003-2007, 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 #ifndef CONFIG_NATIVE_WINDOWS
  18
  19 #include "hostapd.h"
  20 #include "ieee802_11.h"
  21 #include "ieee802_11_auth.h"
  22 #include "radius/radius.h"
  23 #include "radius/radius_client.h"
  24 #include "eloop.h"
  25 #include "driver.h"
  26
  27 #define RADIUS_ACL_TIMEOUT 30
  28
  29
  30 struct hostapd_cached_radius_acl {
  31         time_t timestamp;
  32         macaddr addr;
  33         int accepted; /* HOSTAPD_ACL_* */
  34         struct hostapd_cached_radius_acl *next;
  35         u32 session_timeout;
  36         u32 acct_interim_interval;
  37         int vlan_id;
  38 };
  39
  40
  41 struct hostapd_acl_query_data {
  42         time_t timestamp;
  43         u8 radius_id;
  44         macaddr addr;
  45         u8 *auth_msg; /* IEEE 802.11 authentication frame from station */
  46         size_t auth_msg_len;
  47         struct hostapd_acl_query_data *next;
  48 };
  49
  50
  51 static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl *acl_cache)
  52 {
  53         struct hostapd_cached_radius_acl *prev;
  54
  55         while (acl_cache) {
  56                 prev = acl_cache;
  57                 acl_cache = acl_cache->next;
  58                 os_free(prev);
  59         }
  60 }
  61
  62
  63 static int hostapd_acl_cache_get(struct hostapd_data *hapd, const u8 *addr,
  64                                  u32 *session_timeout,
  65                                  u32 *acct_interim_interval, int *vlan_id)
  66 {
  67         struct hostapd_cached_radius_acl *entry;
  68         time_t now;
  69
  70         time(&now);
  71         entry = hapd->acl_cache;
  72
  73         while (entry) {
  74                 if (os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
  75                         if (now - entry->timestamp > RADIUS_ACL_TIMEOUT)
  76                                 return -1; /* entry has expired */
  77                         if (entry->accepted == HOSTAPD_ACL_ACCEPT_TIMEOUT)
  78                                 if (session_timeout)
  79                                         *session_timeout =
  80                                                 entry->session_timeout;
  81                         if (acct_interim_interval)
  82                                 *acct_interim_interval =
  83                                         entry->acct_interim_interval;
  84                         if (vlan_id)
  85                                 *vlan_id = entry->vlan_id;
  86                         return entry->accepted;
  87                 }
  88
  89                 entry = entry->next;
  90         }
  91
  92         return -1;
  93 }
  94
  95
  96 static void hostapd_acl_query_free(struct hostapd_acl_query_data *query)
  97 {
  98         if (query == NULL)
  99                 return;
 100         os_free(query->auth_msg);
 101         os_free(query);
 102 }
 103
 104
 105 static int hostapd_radius_acl_query(struct hostapd_data *hapd, const u8 *addr,
 106                                     struct hostapd_acl_query_data *query)
 107 {
 108         struct radius_msg *msg;
 109         char buf[128];
 110
 111         query->radius_id = radius_client_get_id(hapd->radius);
 112         msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id);
 113         if (msg == NULL)
 114                 return -1;
 115
 116         radius_msg_make_authenticator(msg, addr, ETH_ALEN);
 117
 118         os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr));
 119         if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf,
 120                                  os_strlen(buf))) {
 121                 wpa_printf(MSG_DEBUG, "Could not add User-Name");
 122                 goto fail;
 123         }
 124
 125         if (!radius_msg_add_attr_user_password(
 126                     msg, (u8 *) buf, os_strlen(buf),
 127                     hapd->conf->radius->auth_server->shared_secret,
 128                     hapd->conf->radius->auth_server->shared_secret_len)) {
 129                 wpa_printf(MSG_DEBUG, "Could not add User-Password");
 130                 goto fail;
 131         }
 132
 133         if (hapd->conf->own_ip_addr.af == AF_INET &&
 134             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
 135                                  (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
 136                 wpa_printf(MSG_DEBUG, "Could not add NAS-IP-Address");
 137                 goto fail;
 138         }
 139
 140 #ifdef CONFIG_IPV6
 141         if (hapd->conf->own_ip_addr.af == AF_INET6 &&
 142             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
 143                                  (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
 144                 wpa_printf(MSG_DEBUG, "Could not add NAS-IPv6-Address");
 145                 goto fail;
 146         }
 147 #endif /* CONFIG_IPV6 */
 148
 149         if (hapd->conf->nas_identifier &&
 150             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
 151                                  (u8 *) hapd->conf->nas_identifier,
 152                                  os_strlen(hapd->conf->nas_identifier))) {
 153                 wpa_printf(MSG_DEBUG, "Could not add NAS-Identifier");
 154                 goto fail;
 155         }
 156
 157         os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
 158                     MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
 159         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
 160                                  (u8 *) buf, os_strlen(buf))) {
 161                 wpa_printf(MSG_DEBUG, "Could not add Called-Station-Id");
 162                 goto fail;
 163         }
 164
 165         os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
 166                     MAC2STR(addr));
 167         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
 168                                  (u8 *) buf, os_strlen(buf))) {
 169                 wpa_printf(MSG_DEBUG, "Could not add Calling-Station-Id");
 170                 goto fail;
 171         }
 172
 173         if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
 174                                        RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
 175                 wpa_printf(MSG_DEBUG, "Could not add NAS-Port-Type");
 176                 goto fail;
 177         }
 178
 179         os_snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
 180         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
 181                                  (u8 *) buf, os_strlen(buf))) {
 182                 wpa_printf(MSG_DEBUG, "Could not add Connect-Info");
 183                 goto fail;
 184         }
 185
 186         radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr);
 187         return 0;
 188
 189  fail:
 190         radius_msg_free(msg);
 191         os_free(msg);
 192         return -1;
 193 }
 194
 195
 196 int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
 197                             const u8 *msg, size_t len, u32 *session_timeout,
 198                             u32 *acct_interim_interval, int *vlan_id)
 199 {
 200         if (session_timeout)
 201                 *session_timeout = 0;
 202         if (acct_interim_interval)
 203                 *acct_interim_interval = 0;
 204         if (vlan_id)
 205                 *vlan_id = 0;
 206
 207         if (hostapd_maclist_found(hapd->conf->accept_mac,
 208                                   hapd->conf->num_accept_mac, addr))
 209                 return HOSTAPD_ACL_ACCEPT;
 210
 211         if (hostapd_maclist_found(hapd->conf->deny_mac,
 212                                   hapd->conf->num_deny_mac, addr))
 213                 return HOSTAPD_ACL_REJECT;
 214
 215         if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
 216                 return HOSTAPD_ACL_ACCEPT;
 217         if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
 218                 return HOSTAPD_ACL_REJECT;
 219
 220         if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
 221                 struct hostapd_acl_query_data *query;
 222
 223                 /* Check whether ACL cache has an entry for this station */
 224                 int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
 225                                                 acct_interim_interval,
 226                                                 vlan_id);
 227                 if (res == HOSTAPD_ACL_ACCEPT ||
 228                     res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
 229                         return res;
 230                 if (res == HOSTAPD_ACL_REJECT)
 231                         return HOSTAPD_ACL_REJECT;
 232
 233                 query = hapd->acl_queries;
 234                 while (query) {
 235                         if (os_memcmp(query->addr, addr, ETH_ALEN) == 0) {
 236                                 /* pending query in RADIUS retransmit queue;
 237                                  * do not generate a new one */
 238                                 return HOSTAPD_ACL_PENDING;
 239                         }
 240                         query = query->next;
 241                 }
 242
 243                 if (!hapd->conf->radius->auth_server)
 244                         return HOSTAPD_ACL_REJECT;
 245
 246                 /* No entry in the cache - query external RADIUS server */
 247                 query = os_zalloc(sizeof(*query));
 248                 if (query == NULL) {
 249                         wpa_printf(MSG_ERROR, "malloc for query data failed");
 250                         return HOSTAPD_ACL_REJECT;
 251                 }
 252                 time(&query->timestamp);
 253                 os_memcpy(query->addr, addr, ETH_ALEN);
 254                 if (hostapd_radius_acl_query(hapd, addr, query)) {
 255                         wpa_printf(MSG_DEBUG, "Failed to send Access-Request "
 256                                    "for ACL query.");
 257                         hostapd_acl_query_free(query);
 258                         return HOSTAPD_ACL_REJECT;
 259                 }
 260
 261                 query->auth_msg = os_malloc(len);
 262                 if (query->auth_msg == NULL) {
 263                         wpa_printf(MSG_ERROR, "Failed to allocate memory for "
 264                                    "auth frame.");
 265                         hostapd_acl_query_free(query);
 266                         return HOSTAPD_ACL_REJECT;
 267                 }
 268                 os_memcpy(query->auth_msg, msg, len);
 269                 query->auth_msg_len = len;
 270                 query->next = hapd->acl_queries;
 271                 hapd->acl_queries = query;
 272
 273                 /* Queued data will be processed in hostapd_acl_recv_radius()
 274                  * when RADIUS server replies to the sent Access-Request. */
 275                 return HOSTAPD_ACL_PENDING;
 276         }
 277
 278         return HOSTAPD_ACL_REJECT;
 279 }
 280
 281
 282 static void hostapd_acl_expire_cache(struct hostapd_data *hapd, time_t now)
 283 {
 284         struct hostapd_cached_radius_acl *prev, *entry, *tmp;
 285
 286         prev = NULL;
 287         entry = hapd->acl_cache;
 288
 289         while (entry) {
 290                 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
 291                         wpa_printf(MSG_DEBUG, "Cached ACL entry for " MACSTR
 292                                    " has expired.", MAC2STR(entry->addr));
 293                         if (prev)
 294                                 prev->next = entry->next;
 295                         else
 296                                 hapd->acl_cache = entry->next;
 297 #ifdef CONFIG_DRIVER_RADIUS_ACL
 298                         hostapd_set_radius_acl_expire(hapd, entry->addr);
 299 #endif /* CONFIG_DRIVER_RADIUS_ACL */
 300                         tmp = entry;
 301                         entry = entry->next;
 302                         os_free(tmp);
 303                         continue;
 304                 }
 305
 306                 prev = entry;
 307                 entry = entry->next;
 308         }
 309 }
 310
 311
 312 static void hostapd_acl_expire_queries(struct hostapd_data *hapd, time_t now)
 313 {
 314         struct hostapd_acl_query_data *prev, *entry, *tmp;
 315
 316         prev = NULL;
 317         entry = hapd->acl_queries;
 318
 319         while (entry) {
 320                 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
 321                         wpa_printf(MSG_DEBUG, "ACL query for " MACSTR
 322                                    " has expired.", MAC2STR(entry->addr));
 323                         if (prev)
 324                                 prev->next = entry->next;
 325                         else
 326                                 hapd->acl_queries = entry->next;
 327
 328                         tmp = entry;
 329                         entry = entry->next;
 330                         hostapd_acl_query_free(tmp);
 331                         continue;
 332                 }
 333
 334                 prev = entry;
 335                 entry = entry->next;
 336         }
 337 }
 338
 339
 340 static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx)
 341 {
 342         struct hostapd_data *hapd = eloop_ctx;
 343         time_t now;
 344
 345         time(&now);
 346         hostapd_acl_expire_cache(hapd, now);
 347         hostapd_acl_expire_queries(hapd, now);
 348
 349         eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
 350 }
 351
 352
 353 /* Return 0 if RADIUS message was a reply to ACL query (and was processed here)
 354  * or -1 if not. */
 355 static RadiusRxResult
 356 hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
 357                         u8 *shared_secret, size_t shared_secret_len,
 358                         void *data)
 359 {
 360         struct hostapd_data *hapd = data;
 361         struct hostapd_acl_query_data *query, *prev;
 362         struct hostapd_cached_radius_acl *cache;
 363
 364         query = hapd->acl_queries;
 365         prev = NULL;
 366         while (query) {
 367                 if (query->radius_id == msg->hdr->identifier)
 368                         break;
 369                 prev = query;
 370                 query = query->next;
 371         }
 372         if (query == NULL)
 373                 return RADIUS_RX_UNKNOWN;
 374
 375         wpa_printf(MSG_DEBUG, "Found matching Access-Request for RADIUS "
 376                    "message (id=%d)", query->radius_id);
 377
 378         if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
 379                 wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have "
 380                            "correct authenticator - dropped\n");
 381                 return RADIUS_RX_INVALID_AUTHENTICATOR;
 382         }
 383
 384         if (msg->hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
 385             msg->hdr->code != RADIUS_CODE_ACCESS_REJECT) {
 386                 wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL "
 387                            "query", msg->hdr->code);
 388                 return RADIUS_RX_UNKNOWN;
 389         }
 390
 391         /* Insert Accept/Reject info into ACL cache */
 392         cache = os_zalloc(sizeof(*cache));
 393         if (cache == NULL) {
 394                 wpa_printf(MSG_DEBUG, "Failed to add ACL cache entry");
 395                 goto done;
 396         }
 397         time(&cache->timestamp);
 398         os_memcpy(cache->addr, query->addr, sizeof(cache->addr));
 399         if (msg->hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
 400                 if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
 401                                               &cache->session_timeout) == 0)
 402                         cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
 403                 else
 404                         cache->accepted = HOSTAPD_ACL_ACCEPT;
 405
 406                 if (radius_msg_get_attr_int32(
 407                             msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
 408                             &cache->acct_interim_interval) == 0 &&
 409                     cache->acct_interim_interval < 60) {
 410                         wpa_printf(MSG_DEBUG, "Ignored too small "
 411                                    "Acct-Interim-Interval %d for STA " MACSTR,
 412                                    cache->acct_interim_interval,
 413                                    MAC2STR(query->addr));
 414                         cache->acct_interim_interval = 0;
 415                 }
 416
 417                 cache->vlan_id = radius_msg_get_vlanid(msg);
 418         } else
 419                 cache->accepted = HOSTAPD_ACL_REJECT;
 420         cache->next = hapd->acl_cache;
 421         hapd->acl_cache = cache;
 422
 423 #ifdef CONFIG_DRIVER_RADIUS_ACL
 424         hostapd_set_radius_acl_auth(hapd, query->addr, cache->accepted,
 425                                     cache->session_timeout);
 426 #else /* CONFIG_DRIVER_RADIUS_ACL */
 427         /* Re-send original authentication frame for 802.11 processing */
 428         wpa_printf(MSG_DEBUG, "Re-sending authentication frame after "
 429                    "successful RADIUS ACL query");
 430         ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len,
 431                         WLAN_FC_STYPE_AUTH, NULL);
 432 #endif /* CONFIG_DRIVER_RADIUS_ACL */
 433
 434  done:
 435         if (prev == NULL)
 436                 hapd->acl_queries = query->next;
 437         else
 438                 prev->next = query->next;
 439
 440         hostapd_acl_query_free(query);
 441
 442         return RADIUS_RX_PROCESSED;
 443 }
 444
 445
 446 int hostapd_acl_init(struct hostapd_data *hapd)
 447 {
 448         if (radius_client_register(hapd->radius, RADIUS_AUTH,
 449                                    hostapd_acl_recv_radius, hapd))
 450                 return -1;
 451
 452         eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
 453
 454         return 0;
 455 }
 456
 457
 458 void hostapd_acl_deinit(struct hostapd_data *hapd)
 459 {
 460         struct hostapd_acl_query_data *query, *prev;
 461
 462         eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);
 463
 464         hostapd_acl_cache_free(hapd->acl_cache);
 465
 466         query = hapd->acl_queries;
 467         while (query) {
 468                 prev = query;
 469                 query = query->next;
 470                 hostapd_acl_query_free(prev);
 471         }
 472 }
 473
 474
 475 int hostapd_acl_reconfig(struct hostapd_data *hapd,
 476                          struct hostapd_config *oldconf)
 477 {
 478         if (!hapd->radius_client_reconfigured)
 479                 return 0;
 480
 481         hostapd_acl_deinit(hapd);
 482         return hostapd_acl_init(hapd);
 483 }
 484
 485 #endif /* CONFIG_NATIVE_WINDOWS */