1 /* 2 * hostapd / IEEE 802.11 authentication (ACL) 3 * Copyright (c) 2003-2009, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 * 8 * Access control list for IEEE 802.11 authentication can uses statically 9 * configured ACL from configuration files or an external RADIUS server. 10 * Results from external RADIUS queries are cached to allow faster 11 * authentication frame processing. 12 */ 13 14 #include "utils/includes.h" 15 16 #include "utils/common.h" 17 #include "utils/eloop.h" 18 #include "crypto/sha1.h" 19 #include "radius/radius.h" 20 #include "radius/radius_client.h" 21 #include "hostapd.h" 22 #include "ap_config.h" 23 #include "ap_drv_ops.h" 24 #include "ieee802_11.h" 25 #include "ieee802_11_auth.h" 26 27 #define RADIUS_ACL_TIMEOUT 30 28 29 30 struct hostapd_cached_radius_acl { 31 os_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 int has_psk; 39 u8 psk[PMK_LEN]; 40 }; 41 42 43 struct hostapd_acl_query_data { 44 os_time_t timestamp; 45 u8 radius_id; 46 macaddr addr; 47 u8 *auth_msg; /* IEEE 802.11 authentication frame from station */ 48 size_t auth_msg_len; 49 struct hostapd_acl_query_data *next; 50 }; 51 52 53 #ifndef CONFIG_NO_RADIUS 54 static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl *acl_cache) 55 { 56 struct hostapd_cached_radius_acl *prev; 57 58 while (acl_cache) { 59 prev = acl_cache; 60 acl_cache = acl_cache->next; 61 os_free(prev); 62 } 63 } 64 65 66 static int hostapd_acl_cache_get(struct hostapd_data *hapd, const u8 *addr, 67 u32 *session_timeout, 68 u32 *acct_interim_interval, int *vlan_id, 69 u8 *psk, int *has_psk) 70 { 71 struct hostapd_cached_radius_acl *entry; 72 struct os_time now; 73 74 os_get_time(&now); 75 entry = hapd->acl_cache; 76 77 while (entry) { 78 if (os_memcmp(entry->addr, addr, ETH_ALEN) == 0) { 79 if (now.sec - entry->timestamp > RADIUS_ACL_TIMEOUT) 80 return -1; /* entry has expired */ 81 if (entry->accepted == HOSTAPD_ACL_ACCEPT_TIMEOUT) 82 if (session_timeout) 83 *session_timeout = 84 entry->session_timeout; 85 if (acct_interim_interval) 86 *acct_interim_interval = 87 entry->acct_interim_interval; 88 if (vlan_id) 89 *vlan_id = entry->vlan_id; 90 if (psk) 91 os_memcpy(psk, entry->psk, PMK_LEN); 92 if (has_psk) 93 *has_psk = entry->has_psk; 94 return entry->accepted; 95 } 96 97 entry = entry->next; 98 } 99 100 return -1; 101 } 102 #endif /* CONFIG_NO_RADIUS */ 103 104 105 static void hostapd_acl_query_free(struct hostapd_acl_query_data *query) 106 { 107 if (query == NULL) 108 return; 109 os_free(query->auth_msg); 110 os_free(query); 111 } 112 113 114 #ifndef CONFIG_NO_RADIUS 115 static int hostapd_radius_acl_query(struct hostapd_data *hapd, const u8 *addr, 116 struct hostapd_acl_query_data *query) 117 { 118 struct radius_msg *msg; 119 char buf[128]; 120 121 query->radius_id = radius_client_get_id(hapd->radius); 122 msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id); 123 if (msg == NULL) 124 return -1; 125 126 radius_msg_make_authenticator(msg, addr, ETH_ALEN); 127 128 os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr)); 129 if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf, 130 os_strlen(buf))) { 131 wpa_printf(MSG_DEBUG, "Could not add User-Name"); 132 goto fail; 133 } 134 135 if (!radius_msg_add_attr_user_password( 136 msg, (u8 *) buf, os_strlen(buf), 137 hapd->conf->radius->auth_server->shared_secret, 138 hapd->conf->radius->auth_server->shared_secret_len)) { 139 wpa_printf(MSG_DEBUG, "Could not add User-Password"); 140 goto fail; 141 } 142 143 if (hapd->conf->own_ip_addr.af == AF_INET && 144 !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS, 145 (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) { 146 wpa_printf(MSG_DEBUG, "Could not add NAS-IP-Address"); 147 goto fail; 148 } 149 150 #ifdef CONFIG_IPV6 151 if (hapd->conf->own_ip_addr.af == AF_INET6 && 152 !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS, 153 (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) { 154 wpa_printf(MSG_DEBUG, "Could not add NAS-IPv6-Address"); 155 goto fail; 156 } 157 #endif /* CONFIG_IPV6 */ 158 159 if (hapd->conf->nas_identifier && 160 !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER, 161 (u8 *) hapd->conf->nas_identifier, 162 os_strlen(hapd->conf->nas_identifier))) { 163 wpa_printf(MSG_DEBUG, "Could not add NAS-Identifier"); 164 goto fail; 165 } 166 167 os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s", 168 MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid); 169 if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID, 170 (u8 *) buf, os_strlen(buf))) { 171 wpa_printf(MSG_DEBUG, "Could not add Called-Station-Id"); 172 goto fail; 173 } 174 175 os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT, 176 MAC2STR(addr)); 177 if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID, 178 (u8 *) buf, os_strlen(buf))) { 179 wpa_printf(MSG_DEBUG, "Could not add Calling-Station-Id"); 180 goto fail; 181 } 182 183 if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE, 184 RADIUS_NAS_PORT_TYPE_IEEE_802_11)) { 185 wpa_printf(MSG_DEBUG, "Could not add NAS-Port-Type"); 186 goto fail; 187 } 188 189 os_snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b"); 190 if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO, 191 (u8 *) buf, os_strlen(buf))) { 192 wpa_printf(MSG_DEBUG, "Could not add Connect-Info"); 193 goto fail; 194 } 195 196 radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr); 197 return 0; 198 199 fail: 200 radius_msg_free(msg); 201 return -1; 202 } 203 #endif /* CONFIG_NO_RADIUS */ 204 205 206 /** 207 * hostapd_allowed_address - Check whether a specified STA can be authenticated 208 * @hapd: hostapd BSS data 209 * @addr: MAC address of the STA 210 * @msg: Authentication message 211 * @len: Length of msg in octets 212 * @session_timeout: Buffer for returning session timeout (from RADIUS) 213 * @acct_interim_interval: Buffer for returning account interval (from RADIUS) 214 * @vlan_id: Buffer for returning VLAN ID 215 * @psk: Buffer for returning WPA PSK 216 * @has_psk: Buffer for indicating whether psk was filled 217 * Returns: HOSTAPD_ACL_ACCEPT, HOSTAPD_ACL_REJECT, or HOSTAPD_ACL_PENDING 218 */ 219 int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr, 220 const u8 *msg, size_t len, u32 *session_timeout, 221 u32 *acct_interim_interval, int *vlan_id, 222 u8 *psk, int *has_psk) 223 { 224 if (session_timeout) 225 *session_timeout = 0; 226 if (acct_interim_interval) 227 *acct_interim_interval = 0; 228 if (vlan_id) 229 *vlan_id = 0; 230 if (has_psk) 231 *has_psk = 0; 232 if (psk) 233 os_memset(psk, 0, PMK_LEN); 234 235 if (hostapd_maclist_found(hapd->conf->accept_mac, 236 hapd->conf->num_accept_mac, addr, vlan_id)) 237 return HOSTAPD_ACL_ACCEPT; 238 239 if (hostapd_maclist_found(hapd->conf->deny_mac, 240 hapd->conf->num_deny_mac, addr, vlan_id)) 241 return HOSTAPD_ACL_REJECT; 242 243 if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED) 244 return HOSTAPD_ACL_ACCEPT; 245 if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED) 246 return HOSTAPD_ACL_REJECT; 247 248 if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) { 249 #ifdef CONFIG_NO_RADIUS 250 return HOSTAPD_ACL_REJECT; 251 #else /* CONFIG_NO_RADIUS */ 252 struct hostapd_acl_query_data *query; 253 struct os_time t; 254 255 /* Check whether ACL cache has an entry for this station */ 256 int res = hostapd_acl_cache_get(hapd, addr, session_timeout, 257 acct_interim_interval, 258 vlan_id, psk, has_psk); 259 if (res == HOSTAPD_ACL_ACCEPT || 260 res == HOSTAPD_ACL_ACCEPT_TIMEOUT) 261 return res; 262 if (res == HOSTAPD_ACL_REJECT) 263 return HOSTAPD_ACL_REJECT; 264 265 query = hapd->acl_queries; 266 while (query) { 267 if (os_memcmp(query->addr, addr, ETH_ALEN) == 0) { 268 /* pending query in RADIUS retransmit queue; 269 * do not generate a new one */ 270 return HOSTAPD_ACL_PENDING; 271 } 272 query = query->next; 273 } 274 275 if (!hapd->conf->radius->auth_server) 276 return HOSTAPD_ACL_REJECT; 277 278 /* No entry in the cache - query external RADIUS server */ 279 query = os_zalloc(sizeof(*query)); 280 if (query == NULL) { 281 wpa_printf(MSG_ERROR, "malloc for query data failed"); 282 return HOSTAPD_ACL_REJECT; 283 } 284 os_get_time(&t); 285 query->timestamp = t.sec; 286 os_memcpy(query->addr, addr, ETH_ALEN); 287 if (hostapd_radius_acl_query(hapd, addr, query)) { 288 wpa_printf(MSG_DEBUG, "Failed to send Access-Request " 289 "for ACL query."); 290 hostapd_acl_query_free(query); 291 return HOSTAPD_ACL_REJECT; 292 } 293 294 query->auth_msg = os_malloc(len); 295 if (query->auth_msg == NULL) { 296 wpa_printf(MSG_ERROR, "Failed to allocate memory for " 297 "auth frame."); 298 hostapd_acl_query_free(query); 299 return HOSTAPD_ACL_REJECT; 300 } 301 os_memcpy(query->auth_msg, msg, len); 302 query->auth_msg_len = len; 303 query->next = hapd->acl_queries; 304 hapd->acl_queries = query; 305 306 /* Queued data will be processed in hostapd_acl_recv_radius() 307 * when RADIUS server replies to the sent Access-Request. */ 308 return HOSTAPD_ACL_PENDING; 309 #endif /* CONFIG_NO_RADIUS */ 310 } 311 312 return HOSTAPD_ACL_REJECT; 313 } 314 315 316 #ifndef CONFIG_NO_RADIUS 317 static void hostapd_acl_expire_cache(struct hostapd_data *hapd, os_time_t now) 318 { 319 struct hostapd_cached_radius_acl *prev, *entry, *tmp; 320 321 prev = NULL; 322 entry = hapd->acl_cache; 323 324 while (entry) { 325 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) { 326 wpa_printf(MSG_DEBUG, "Cached ACL entry for " MACSTR 327 " has expired.", MAC2STR(entry->addr)); 328 if (prev) 329 prev->next = entry->next; 330 else 331 hapd->acl_cache = entry->next; 332 hostapd_drv_set_radius_acl_expire(hapd, entry->addr); 333 tmp = entry; 334 entry = entry->next; 335 os_free(tmp); 336 continue; 337 } 338 339 prev = entry; 340 entry = entry->next; 341 } 342 } 343 344 345 static void hostapd_acl_expire_queries(struct hostapd_data *hapd, 346 os_time_t now) 347 { 348 struct hostapd_acl_query_data *prev, *entry, *tmp; 349 350 prev = NULL; 351 entry = hapd->acl_queries; 352 353 while (entry) { 354 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) { 355 wpa_printf(MSG_DEBUG, "ACL query for " MACSTR 356 " has expired.", MAC2STR(entry->addr)); 357 if (prev) 358 prev->next = entry->next; 359 else 360 hapd->acl_queries = entry->next; 361 362 tmp = entry; 363 entry = entry->next; 364 hostapd_acl_query_free(tmp); 365 continue; 366 } 367 368 prev = entry; 369 entry = entry->next; 370 } 371 } 372 373 374 /** 375 * hostapd_acl_expire - ACL cache expiration callback 376 * @eloop_ctx: struct hostapd_data * 377 * @timeout_ctx: Not used 378 */ 379 static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx) 380 { 381 struct hostapd_data *hapd = eloop_ctx; 382 struct os_time now; 383 384 os_get_time(&now); 385 hostapd_acl_expire_cache(hapd, now.sec); 386 hostapd_acl_expire_queries(hapd, now.sec); 387 388 eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL); 389 } 390 391 392 /** 393 * hostapd_acl_recv_radius - Process incoming RADIUS Authentication messages 394 * @msg: RADIUS response message 395 * @req: RADIUS request message 396 * @shared_secret: RADIUS shared secret 397 * @shared_secret_len: Length of shared_secret in octets 398 * @data: Context data (struct hostapd_data *) 399 * Returns: RADIUS_RX_PROCESSED if RADIUS message was a reply to ACL query (and 400 * was processed here) or RADIUS_RX_UNKNOWN if not. 401 */ 402 static RadiusRxResult 403 hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req, 404 const u8 *shared_secret, size_t shared_secret_len, 405 void *data) 406 { 407 struct hostapd_data *hapd = data; 408 struct hostapd_acl_query_data *query, *prev; 409 struct hostapd_cached_radius_acl *cache; 410 struct radius_hdr *hdr = radius_msg_get_hdr(msg); 411 struct os_time t; 412 413 query = hapd->acl_queries; 414 prev = NULL; 415 while (query) { 416 if (query->radius_id == hdr->identifier) 417 break; 418 prev = query; 419 query = query->next; 420 } 421 if (query == NULL) 422 return RADIUS_RX_UNKNOWN; 423 424 wpa_printf(MSG_DEBUG, "Found matching Access-Request for RADIUS " 425 "message (id=%d)", query->radius_id); 426 427 if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) { 428 wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have " 429 "correct authenticator - dropped\n"); 430 return RADIUS_RX_INVALID_AUTHENTICATOR; 431 } 432 433 if (hdr->code != RADIUS_CODE_ACCESS_ACCEPT && 434 hdr->code != RADIUS_CODE_ACCESS_REJECT) { 435 wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL " 436 "query", hdr->code); 437 return RADIUS_RX_UNKNOWN; 438 } 439 440 /* Insert Accept/Reject info into ACL cache */ 441 cache = os_zalloc(sizeof(*cache)); 442 if (cache == NULL) { 443 wpa_printf(MSG_DEBUG, "Failed to add ACL cache entry"); 444 goto done; 445 } 446 os_get_time(&t); 447 cache->timestamp = t.sec; 448 os_memcpy(cache->addr, query->addr, sizeof(cache->addr)); 449 if (hdr->code == RADIUS_CODE_ACCESS_ACCEPT) { 450 int passphraselen; 451 char *passphrase; 452 453 if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT, 454 &cache->session_timeout) == 0) 455 cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT; 456 else 457 cache->accepted = HOSTAPD_ACL_ACCEPT; 458 459 if (radius_msg_get_attr_int32( 460 msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL, 461 &cache->acct_interim_interval) == 0 && 462 cache->acct_interim_interval < 60) { 463 wpa_printf(MSG_DEBUG, "Ignored too small " 464 "Acct-Interim-Interval %d for STA " MACSTR, 465 cache->acct_interim_interval, 466 MAC2STR(query->addr)); 467 cache->acct_interim_interval = 0; 468 } 469 470 cache->vlan_id = radius_msg_get_vlanid(msg); 471 472 passphrase = radius_msg_get_tunnel_password( 473 msg, &passphraselen, 474 hapd->conf->radius->auth_server->shared_secret, 475 hapd->conf->radius->auth_server->shared_secret_len, 476 req); 477 cache->has_psk = passphrase != NULL; 478 if (passphrase != NULL) { 479 /* passphrase does not contain the NULL termination. 480 * Add it here as pbkdf2_sha1 requires it. */ 481 char *strpassphrase = os_zalloc(passphraselen + 1); 482 if (strpassphrase) { 483 os_memcpy(strpassphrase, passphrase, 484 passphraselen); 485 pbkdf2_sha1(strpassphrase, 486 hapd->conf->ssid.ssid, 487 hapd->conf->ssid.ssid_len, 4096, 488 cache->psk, PMK_LEN); 489 os_free(strpassphrase); 490 } 491 os_free(passphrase); 492 } 493 494 if (hapd->conf->wpa_psk_radius == PSK_RADIUS_REQUIRED && 495 cache->psk == NULL) 496 cache->accepted = HOSTAPD_ACL_REJECT; 497 } else 498 cache->accepted = HOSTAPD_ACL_REJECT; 499 cache->next = hapd->acl_cache; 500 hapd->acl_cache = cache; 501 502 #ifdef CONFIG_DRIVER_RADIUS_ACL 503 hostapd_drv_set_radius_acl_auth(hapd, query->addr, cache->accepted, 504 cache->session_timeout); 505 #else /* CONFIG_DRIVER_RADIUS_ACL */ 506 #ifdef NEED_AP_MLME 507 /* Re-send original authentication frame for 802.11 processing */ 508 wpa_printf(MSG_DEBUG, "Re-sending authentication frame after " 509 "successful RADIUS ACL query"); 510 ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len, NULL); 511 #endif /* NEED_AP_MLME */ 512 #endif /* CONFIG_DRIVER_RADIUS_ACL */ 513 514 done: 515 if (prev == NULL) 516 hapd->acl_queries = query->next; 517 else 518 prev->next = query->next; 519 520 hostapd_acl_query_free(query); 521 522 return RADIUS_RX_PROCESSED; 523 } 524 #endif /* CONFIG_NO_RADIUS */ 525 526 527 /** 528 * hostapd_acl_init: Initialize IEEE 802.11 ACL 529 * @hapd: hostapd BSS data 530 * Returns: 0 on success, -1 on failure 531 */ 532 int hostapd_acl_init(struct hostapd_data *hapd) 533 { 534 #ifndef CONFIG_NO_RADIUS 535 if (radius_client_register(hapd->radius, RADIUS_AUTH, 536 hostapd_acl_recv_radius, hapd)) 537 return -1; 538 539 eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL); 540 #endif /* CONFIG_NO_RADIUS */ 541 542 return 0; 543 } 544 545 546 /** 547 * hostapd_acl_deinit - Deinitialize IEEE 802.11 ACL 548 * @hapd: hostapd BSS data 549 */ 550 void hostapd_acl_deinit(struct hostapd_data *hapd) 551 { 552 struct hostapd_acl_query_data *query, *prev; 553 554 #ifndef CONFIG_NO_RADIUS 555 eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL); 556 557 hostapd_acl_cache_free(hapd->acl_cache); 558 #endif /* CONFIG_NO_RADIUS */ 559 560 query = hapd->acl_queries; 561 while (query) { 562 prev = query; 563 query = query->next; 564 hostapd_acl_query_free(prev); 565 } 566 } 567
