1 /* 2 * hostapd / IEEE 802.11 authentication (ACL) 3 * Copyright (c) 2003-2009, Jouni Malinen <j (at) 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 "ap_drv_ops.h" 29 #include "ieee802_11.h" 30 #include "ieee802_11_auth.h" 31 32 #define RADIUS_ACL_TIMEOUT 30 33 34 35 struct hostapd_cached_radius_acl { 36 os_time_t timestamp; 37 macaddr addr; 38 int accepted; /* HOSTAPD_ACL_* */ 39 struct hostapd_cached_radius_acl *next; 40 u32 session_timeout; 41 u32 acct_interim_interval; 42 int vlan_id; 43 }; 44 45 46 struct hostapd_acl_query_data { 47 os_time_t timestamp; 48 u8 radius_id; 49 macaddr addr; 50 u8 *auth_msg; /* IEEE 802.11 authentication frame from station */ 51 size_t auth_msg_len; 52 struct hostapd_acl_query_data *next; 53 }; 54 55 56 #ifndef CONFIG_NO_RADIUS 57 static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl *acl_cache) 58 { 59 struct hostapd_cached_radius_acl *prev; 60 61 while (acl_cache) { 62 prev = acl_cache; 63 acl_cache = acl_cache->next; 64 os_free(prev); 65 } 66 } 67 68 69 static int hostapd_acl_cache_get(struct hostapd_data *hapd, const u8 *addr, 70 u32 *session_timeout, 71 u32 *acct_interim_interval, int *vlan_id) 72 { 73 struct hostapd_cached_radius_acl *entry; 74 struct os_time now; 75 76 os_get_time(&now); 77 entry = hapd->acl_cache; 78 79 while (entry) { 80 if (os_memcmp(entry->addr, addr, ETH_ALEN) == 0) { 81 if (now.sec - entry->timestamp > RADIUS_ACL_TIMEOUT) 82 return -1; /* entry has expired */ 83 if (entry->accepted == HOSTAPD_ACL_ACCEPT_TIMEOUT) 84 if (session_timeout) 85 *session_timeout = 86 entry->session_timeout; 87 if (acct_interim_interval) 88 *acct_interim_interval = 89 entry->acct_interim_interval; 90 if (vlan_id) 91 *vlan_id = entry->vlan_id; 92 return entry->accepted; 93 } 94 95 entry = entry->next; 96 } 97 98 return -1; 99 } 100 #endif /* CONFIG_NO_RADIUS */ 101 102 103 static void hostapd_acl_query_free(struct hostapd_acl_query_data *query) 104 { 105 if (query == NULL) 106 return; 107 os_free(query->auth_msg); 108 os_free(query); 109 } 110 111 112 #ifndef CONFIG_NO_RADIUS 113 static int hostapd_radius_acl_query(struct hostapd_data *hapd, const u8 *addr, 114 struct hostapd_acl_query_data *query) 115 { 116 struct radius_msg *msg; 117 char buf[128]; 118 119 query->radius_id = radius_client_get_id(hapd->radius); 120 msg = radius_msg_new(RADIUS_CODE_ACCESS_REQUEST, query->radius_id); 121 if (msg == NULL) 122 return -1; 123 124 radius_msg_make_authenticator(msg, addr, ETH_ALEN); 125 126 os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT, MAC2STR(addr)); 127 if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, (u8 *) buf, 128 os_strlen(buf))) { 129 wpa_printf(MSG_DEBUG, "Could not add User-Name"); 130 goto fail; 131 } 132 133 if (!radius_msg_add_attr_user_password( 134 msg, (u8 *) buf, os_strlen(buf), 135 hapd->conf->radius->auth_server->shared_secret, 136 hapd->conf->radius->auth_server->shared_secret_len)) { 137 wpa_printf(MSG_DEBUG, "Could not add User-Password"); 138 goto fail; 139 } 140 141 if (hapd->conf->own_ip_addr.af == AF_INET && 142 !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS, 143 (u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) { 144 wpa_printf(MSG_DEBUG, "Could not add NAS-IP-Address"); 145 goto fail; 146 } 147 148 #ifdef CONFIG_IPV6 149 if (hapd->conf->own_ip_addr.af == AF_INET6 && 150 !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS, 151 (u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) { 152 wpa_printf(MSG_DEBUG, "Could not add NAS-IPv6-Address"); 153 goto fail; 154 } 155 #endif /* CONFIG_IPV6 */ 156 157 if (hapd->conf->nas_identifier && 158 !radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER, 159 (u8 *) hapd->conf->nas_identifier, 160 os_strlen(hapd->conf->nas_identifier))) { 161 wpa_printf(MSG_DEBUG, "Could not add NAS-Identifier"); 162 goto fail; 163 } 164 165 os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s", 166 MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid); 167 if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID, 168 (u8 *) buf, os_strlen(buf))) { 169 wpa_printf(MSG_DEBUG, "Could not add Called-Station-Id"); 170 goto fail; 171 } 172 173 os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT, 174 MAC2STR(addr)); 175 if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID, 176 (u8 *) buf, os_strlen(buf))) { 177 wpa_printf(MSG_DEBUG, "Could not add Calling-Station-Id"); 178 goto fail; 179 } 180 181 if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT_TYPE, 182 RADIUS_NAS_PORT_TYPE_IEEE_802_11)) { 183 wpa_printf(MSG_DEBUG, "Could not add NAS-Port-Type"); 184 goto fail; 185 } 186 187 os_snprintf(buf, sizeof(buf), "CONNECT 11Mbps 802.11b"); 188 if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO, 189 (u8 *) buf, os_strlen(buf))) { 190 wpa_printf(MSG_DEBUG, "Could not add Connect-Info"); 191 goto fail; 192 } 193 194 radius_client_send(hapd->radius, msg, RADIUS_AUTH, addr); 195 return 0; 196 197 fail: 198 radius_msg_free(msg); 199 return -1; 200 } 201 #endif /* CONFIG_NO_RADIUS */ 202 203 204 /** 205 * hostapd_allowed_address - Check whether a specified STA can be authenticated 206 * @hapd: hostapd BSS data 207 * @addr: MAC address of the STA 208 * @msg: Authentication message 209 * @len: Length of msg in octets 210 * @session_timeout: Buffer for returning session timeout (from RADIUS) 211 * @acct_interim_interval: Buffer for returning account interval (from RADIUS) 212 * @vlan_id: Buffer for returning VLAN ID 213 * Returns: HOSTAPD_ACL_ACCEPT, HOSTAPD_ACL_REJECT, or HOSTAPD_ACL_PENDING 214 */ 215 int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr, 216 const u8 *msg, size_t len, u32 *session_timeout, 217 u32 *acct_interim_interval, int *vlan_id) 218 { 219 if (session_timeout) 220 *session_timeout = 0; 221 if (acct_interim_interval) 222 *acct_interim_interval = 0; 223 if (vlan_id) 224 *vlan_id = 0; 225 226 if (hostapd_maclist_found(hapd->conf->accept_mac, 227 hapd->conf->num_accept_mac, addr, vlan_id)) 228 return HOSTAPD_ACL_ACCEPT; 229 230 if (hostapd_maclist_found(hapd->conf->deny_mac, 231 hapd->conf->num_deny_mac, addr, vlan_id)) 232 return HOSTAPD_ACL_REJECT; 233 234 if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED) 235 return HOSTAPD_ACL_ACCEPT; 236 if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED) 237 return HOSTAPD_ACL_REJECT; 238 239 if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) { 240 #ifdef CONFIG_NO_RADIUS 241 return HOSTAPD_ACL_REJECT; 242 #else /* CONFIG_NO_RADIUS */ 243 struct hostapd_acl_query_data *query; 244 245 /* Check whether ACL cache has an entry for this station */ 246 int res = hostapd_acl_cache_get(hapd, addr, session_timeout, 247 acct_interim_interval, 248 vlan_id); 249 if (res == HOSTAPD_ACL_ACCEPT || 250 res == HOSTAPD_ACL_ACCEPT_TIMEOUT) 251 return res; 252 if (res == HOSTAPD_ACL_REJECT) 253 return HOSTAPD_ACL_REJECT; 254 255 query = hapd->acl_queries; 256 while (query) { 257 if (os_memcmp(query->addr, addr, ETH_ALEN) == 0) { 258 /* pending query in RADIUS retransmit queue; 259 * do not generate a new one */ 260 return HOSTAPD_ACL_PENDING; 261 } 262 query = query->next; 263 } 264 265 if (!hapd->conf->radius->auth_server) 266 return HOSTAPD_ACL_REJECT; 267 268 /* No entry in the cache - query external RADIUS server */ 269 query = os_zalloc(sizeof(*query)); 270 if (query == NULL) { 271 wpa_printf(MSG_ERROR, "malloc for query data failed"); 272 return HOSTAPD_ACL_REJECT; 273 } 274 time(&query->timestamp); 275 os_memcpy(query->addr, addr, ETH_ALEN); 276 if (hostapd_radius_acl_query(hapd, addr, query)) { 277 wpa_printf(MSG_DEBUG, "Failed to send Access-Request " 278 "for ACL query."); 279 hostapd_acl_query_free(query); 280 return HOSTAPD_ACL_REJECT; 281 } 282 283 query->auth_msg = os_malloc(len); 284 if (query->auth_msg == NULL) { 285 wpa_printf(MSG_ERROR, "Failed to allocate memory for " 286 "auth frame."); 287 hostapd_acl_query_free(query); 288 return HOSTAPD_ACL_REJECT; 289 } 290 os_memcpy(query->auth_msg, msg, len); 291 query->auth_msg_len = len; 292 query->next = hapd->acl_queries; 293 hapd->acl_queries = query; 294 295 /* Queued data will be processed in hostapd_acl_recv_radius() 296 * when RADIUS server replies to the sent Access-Request. */ 297 return HOSTAPD_ACL_PENDING; 298 #endif /* CONFIG_NO_RADIUS */ 299 } 300 301 return HOSTAPD_ACL_REJECT; 302 } 303 304 305 #ifndef CONFIG_NO_RADIUS 306 static void hostapd_acl_expire_cache(struct hostapd_data *hapd, os_time_t now) 307 { 308 struct hostapd_cached_radius_acl *prev, *entry, *tmp; 309 310 prev = NULL; 311 entry = hapd->acl_cache; 312 313 while (entry) { 314 if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) { 315 wpa_printf(MSG_DEBUG, "Cached ACL entry for " MACSTR 316 " has expired.", MAC2STR(entry->addr)); 317 if (prev) 318 prev->next = entry->next; 319 else 320 hapd->acl_cache = entry->next; 321 hostapd_drv_set_radius_acl_expire(hapd, entry->addr); 322 tmp = entry; 323 entry = entry->next; 324 os_free(tmp); 325 continue; 326 } 327 328 prev = entry; 329 entry = entry->next; 330 } 331 } 332 333 334 static void hostapd_acl_expire_queries(struct hostapd_data *hapd, 335 os_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 struct os_time now; 372 373 os_get_time(&now); 374 hostapd_acl_expire_cache(hapd, now.sec); 375 hostapd_acl_expire_queries(hapd, now.sec); 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 hostapd_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 } 525
