contrib/hostapd/ieee802_11_auth.c

   1 /*
   2  * hostapd / IEEE 802.11 authentication (ACL)
   3  * Copyright (c) 2003-2006, 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.h"
  23 #include "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                 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 (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 = entry->session_timeout;
  80                         if (acct_interim_interval)
  81                                 *acct_interim_interval = entry->acct_interim_interval;
  82                         if (vlan_id)
  83                                 *vlan_id = entry->vlan_id;
  84                         return entry->accepted;
  85                 }
  86
  87                 entry = entry->next;
  88         }
  89
  90         return -1;
  91 }
  92
  93
  94 static void hostapd_acl_query_free(struct hostapd_acl_query_data *query)
  95 {
  96         if (query == NULL)
  97                 return;
  98         free(query->auth_msg);
  99         free(query);
 100 }
 101
 102
 103 static int hostapd_radius_acl_query(struct hostapd_data *hapd, const u8 *addr,
 104                                     struct hostapd_acl_query_data *query)
 105 {
 106         struct radius_msg *msg;
 107         char buf[128];
 108
 109         query->radius_id = radius_client_get_id(hapd->radius);
 110         msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id);
 111         if (msg == NULL)
 112                 return -1;
 113
 114         radius_msg_make_authenticator(msg, addr, ETH_ALEN);
 115
 116         snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr));
 117         if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf,
 118                                  strlen(buf))) {
 119                 printf("Could not add User-Name\n");
 120                 goto fail;
 121         }
 122
 123         if (!radius_msg_add_attr_user_password(
 124                     msg, (u8 *) buf, strlen(buf),
 125                     hapd->conf->radius->auth_server->shared_secret,
 126                     hapd->conf->radius->auth_server->shared_secret_len)) {
 127                 printf("Could not add User-Password\n");
 128                 goto fail;
 129         }
 130
 131         if (hapd->conf->own_ip_addr.af == AF_INET &&
 132             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
 133                                  (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
 134                 printf("Could not add NAS-IP-Address\n");
 135                 goto fail;
 136         }
 137
 138 #ifdef CONFIG_IPV6
 139         if (hapd->conf->own_ip_addr.af == AF_INET6 &&
 140             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
 141                                  (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
 142                 printf("Could not add NAS-IPv6-Address\n");
 143                 goto fail;
 144         }
 145 #endif /* CONFIG_IPV6 */
 146
 147         if (hapd->conf->nas_identifier &&
 148             !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
 149                                  (u8 *) hapd->conf->nas_identifier,
 150                                  strlen(hapd->conf->nas_identifier))) {
 151                 printf("Could not add NAS-Identifier\n");
 152                 goto fail;
 153         }
 154
 155         snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
 156                  MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
 157         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
 158                                  (u8 *) buf, strlen(buf))) {
 159                 printf("Could not add Called-Station-Id\n");
 160                 goto fail;
 161         }
 162
 163         snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
 164                  MAC2STR(addr));
 165         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
 166                                  (u8 *) buf, strlen(buf))) {
 167                 printf("Could not add Calling-Station-Id\n");
 168                 goto fail;
 169         }
 170
 171         if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE,
 172                                        RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
 173                 printf("Could not add NAS-Port-Type\n");
 174                 goto fail;
 175         }
 176
 177         snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b");
 178         if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
 179                                  (u8 *) buf, strlen(buf))) {
 180                 printf("Could not add Connect-Info\n");
 181                 goto fail;
 182         }
 183
 184         radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr);
 185         return 0;
 186
 187  fail:
 188         radius_msg_free(msg);
 189         free(msg);
 190         return -1;
 191 }
 192
 193
 194 int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
 195                             const u8 *msg, size_t len, u32 *session_timeout,
 196                             u32 *acct_interim_interval, int *vlan_id)
 197 {
 198         if (session_timeout)
 199                 *session_timeout = 0;
 200         if (acct_interim_interval)
 201                 *acct_interim_interval = 0;
 202         if (vlan_id)
 203                 *vlan_id = 0;
 204
 205         if (hostapd_maclist_found(hapd->conf->accept_mac,
 206                                   hapd->conf->num_accept_mac, addr))
 207                 return HOSTAPD_ACL_ACCEPT;
 208
 209         if (hostapd_maclist_found(hapd->conf->deny_mac,
 210                                   hapd->conf->num_deny_mac, addr))
 211                 return HOSTAPD_ACL_REJECT;
 212
 213         if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
 214                 return HOSTAPD_ACL_ACCEPT;
 215         if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
 216                 return HOSTAPD_ACL_REJECT;
 217
 218         if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
 219                 struct hostapd_acl_query_data *query;
 220
 221                 /* Check whether ACL cache has an entry for this station */
 222                 int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
 223                                                 acct_interim_interval,
 224                                                 vlan_id);
 225                 if (res == HOSTAPD_ACL_ACCEPT ||
 226                     res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
 227                         return res;
 228                 if (res == HOSTAPD_ACL_REJECT)
 229                         return HOSTAPD_ACL_REJECT;
 230
 231                 query = hapd->acl_queries;
 232                 while (query) {
 233                         if (memcmp(query->addr, addr, ETH_ALEN) == 0) {
 234                                 /* pending query in RADIUS retransmit queue;
 235                                  * do not generate a new one */
 236                                 return HOSTAPD_ACL_PENDING;
 237                         }
 238                         query = query->next;
 239                 }
 240
 241                 if (!hapd->conf->radius->auth_server)
 242                         return HOSTAPD_ACL_REJECT;
 243
 244                 /* No entry in the cache - query external RADIUS server */
 245                 query = wpa_zalloc(sizeof(*query));
 246                 if (query == NULL) {
 247                         printf("malloc for query data failed\n");
 248                         return HOSTAPD_ACL_REJECT;
 249                 }
 250                 time(&query->timestamp);
 251                 memcpy(query->addr, addr, ETH_ALEN);
 252                 if (hostapd_radius_acl_query(hapd, addr, query)) {
 253                         printf("Failed to send Access-Request for ACL "
 254                                "query.\n");
 255                         hostapd_acl_query_free(query);
 256                         return HOSTAPD_ACL_REJECT;
 257                 }
 258
 259                 query->auth_msg = malloc(len);
 260                 if (query->auth_msg == NULL) {
 261                         printf("Failed to allocate memory for auth frame.\n");
 262                         hostapd_acl_query_free(query);
 263                         return HOSTAPD_ACL_REJECT;
 264                 }
 265                 memcpy(query->auth_msg, msg, len);
 266                 query->auth_msg_len = len;
 267                 query->next = hapd->acl_queries;
 268                 hapd->acl_queries = query;
 269
 270                 /* Queued data will be processed in hostapd_acl_recv_radius()
 271                  * when RADIUS server replies to the sent Access-Request. */
 272                 return HOSTAPD_ACL_PENDING;
 273         }
 274
 275         return HOSTAPD_ACL_REJECT;
 276 }
 277
 278
 279 static void hostapd_acl_expire_cache(struct hostapd_data *hapd, time_t now)
 280 {
 281         struct hostapd_cached_radius_acl *prev, *entry, *tmp;
 282
 283         prev = NULL;
 284         entry = hapd->acl_cache;
 285
 286         while (entry) {
 287                 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
 288                         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 289                                       "Cached ACL entry for " MACSTR
 290                                       " has expired.\n", MAC2STR(entry->addr));
 291                         if (prev)
 292                                 prev->next = entry->next;
 293                         else
 294                                 hapd->acl_cache = entry->next;
 295 #ifdef CONFIG_DRIVER_RADIUS_ACL
 296                         hostapd_set_radius_acl_expire(hapd, entry->addr);
 297 #endif
 298                         tmp = entry;
 299                         entry = entry->next;
 300                         free(tmp);
 301                         continue;
 302                 }
 303
 304                 prev = entry;
 305                 entry = entry->next;
 306         }
 307 }
 308
 309
 310 static void hostapd_acl_expire_queries(struct hostapd_data *hapd, time_t now)
 311 {
 312         struct hostapd_acl_query_data *prev, *entry, *tmp;
 313
 314         prev = NULL;
 315         entry = hapd->acl_queries;
 316
 317         while (entry) {
 318                 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
 319                         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 320                                       "ACL query for " MACSTR
 321                                       " has expired.\n", MAC2STR(entry->addr));
 322                         if (prev)
 323                                 prev->next = entry->next;
 324                         else
 325                                 hapd->acl_queries = entry->next;
 326
 327                         tmp = entry;
 328                         entry = entry->next;
 329                         hostapd_acl_query_free(tmp);
 330                         continue;
 331                 }
 332
 333                 prev = entry;
 334                 entry = entry->next;
 335         }
 336 }
 337
 338
 339 static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx)
 340 {
 341         struct hostapd_data *hapd = eloop_ctx;
 342         time_t now;
 343
 344         time(&now);
 345         hostapd_acl_expire_cache(hapd, now);
 346         hostapd_acl_expire_queries(hapd, now);
 347
 348         eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
 349 }
 350
 351
 352 /* Return 0 if RADIUS message was a reply to ACL query (and was processed here)
 353  * or -1 if not. */
 354 static RadiusRxResult
 355 hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
 356                         u8 *shared_secret, size_t shared_secret_len,
 357                         void *data)
 358 {
 359         struct hostapd_data *hapd = data;
 360         struct hostapd_acl_query_data *query, *prev;
 361         struct hostapd_cached_radius_acl *cache;
 362
 363         query = hapd->acl_queries;
 364         prev = NULL;
 365         while (query) {
 366                 if (query->radius_id == msg->hdr->identifier)
 367                         break;
 368                 prev = query;
 369                 query = query->next;
 370         }
 371         if (query == NULL)
 372                 return RADIUS_RX_UNKNOWN;
 373
 374         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Found matching Access-Request "
 375                       "for RADIUS message (id=%d)\n", query->radius_id);
 376
 377         if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
 378                 printf("Incoming RADIUS packet did not have correct "
 379                        "authenticator - dropped\n");
 380                 return RADIUS_RX_INVALID_AUTHENTICATOR;
 381         }
 382
 383         if (msg->hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
 384             msg->hdr->code != RADIUS_CODE_ACCESS_REJECT) {
 385                 printf("Unknown RADIUS message code %d to ACL query\n",
 386                        msg->hdr->code);
 387                 return RADIUS_RX_UNKNOWN;
 388         }
 389
 390         /* Insert Accept/Reject info into ACL cache */
 391         cache = wpa_zalloc(sizeof(*cache));
 392         if (cache == NULL) {
 393                 printf("Failed to add ACL cache entry\n");
 394                 goto done;
 395         }
 396         time(&cache->timestamp);
 397         memcpy(cache->addr, query->addr, sizeof(cache->addr));
 398         if (msg->hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
 399                 if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
 400                                               &cache->session_timeout) == 0)
 401                         cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
 402                 else
 403                         cache->accepted = HOSTAPD_ACL_ACCEPT;
 404
 405                 if (radius_msg_get_attr_int32(
 406                             msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
 407                             &cache->acct_interim_interval) == 0 &&
 408                     cache->acct_interim_interval < 60) {
 409                         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Ignored too "
 410                                       "small Acct-Interim-Interval %d for "
 411                                       "STA " MACSTR "\n",
 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
 427         /* Re-send original authentication frame for 802.11 processing */
 428         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Re-sending authentication frame "
 429                       "after successful RADIUS ACL query\n");
 430         ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len,
 431                         WLAN_FC_STYPE_AUTH, NULL);
 432 #endif
 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 */