2 * Host AP (software wireless LAN access point) user space daemon for
3 * Host AP kernel driver / IEEE 802.11 authentication (ACL)
4 * Copyright (c) 2003-2005, Jouni Malinen <jkmaline@cc.hut.fi>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
26 #include "ieee802_11.h"
27 #include "ieee802_11_auth.h"
29 #include "radius_client.h"
31 #include "hostap_common.h"
33 #define RADIUS_ACL_TIMEOUT 30
36 struct hostapd_cached_radius_acl
{
39 int accepted
; /* HOSTAPD_ACL_* */
40 struct hostapd_cached_radius_acl
*next
;
42 u32 acct_interim_interval
;
46 struct hostapd_acl_query_data
{
50 u8
*auth_msg
; /* IEEE 802.11 authentication frame from station */
52 struct hostapd_acl_query_data
*next
;
56 static void hostapd_acl_cache_free(struct hostapd_cached_radius_acl
*acl_cache
)
58 struct hostapd_cached_radius_acl
*prev
;
62 acl_cache
= acl_cache
->next
;
68 static int hostapd_acl_cache_get(struct hostapd_data
*hapd
, u8
*addr
,
70 u32
*acct_interim_interval
)
72 struct hostapd_cached_radius_acl
*entry
;
76 entry
= hapd
->acl_cache
;
79 if (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 *session_timeout
= entry
->session_timeout
;
84 *acct_interim_interval
= entry
->acct_interim_interval
;
85 return entry
->accepted
;
95 static void hostapd_acl_query_free(struct hostapd_acl_query_data
*query
)
99 free(query
->auth_msg
);
104 static int hostapd_radius_acl_query(hostapd
*hapd
, u8
*addr
,
105 struct hostapd_acl_query_data
*query
)
107 struct radius_msg
*msg
;
110 query
->radius_id
= radius_client_get_id(hapd
->radius
);
111 msg
= radius_msg_new(RADIUS_CODE_ACCESS_REQUEST
, query
->radius_id
);
115 radius_msg_make_authenticator(msg
, addr
, ETH_ALEN
);
117 snprintf(buf
, sizeof(buf
), RADIUS_ADDR_FORMAT
, MAC2STR(addr
));
118 if (!radius_msg_add_attr(msg
, RADIUS_ATTR_USER_NAME
, (u8
*) buf
,
120 printf("Could not add User-Name\n");
124 if (!radius_msg_add_attr_user_password(
125 msg
, (u8
*) buf
, strlen(buf
),
126 hapd
->conf
->radius
->auth_server
->shared_secret
,
127 hapd
->conf
->radius
->auth_server
->shared_secret_len
)) {
128 printf("Could not add User-Password\n");
132 if (hapd
->conf
->own_ip_addr
.af
== AF_INET
&&
133 !radius_msg_add_attr(msg
, RADIUS_ATTR_NAS_IP_ADDRESS
,
134 (u8
*) &hapd
->conf
->own_ip_addr
.u
.v4
, 4)) {
135 printf("Could not add NAS-IP-Address\n");
140 if (hapd
->conf
->own_ip_addr
.af
== AF_INET6
&&
141 !radius_msg_add_attr(msg
, RADIUS_ATTR_NAS_IPV6_ADDRESS
,
142 (u8
*) &hapd
->conf
->own_ip_addr
.u
.v6
, 16)) {
143 printf("Could not add NAS-IPv6-Address\n");
146 #endif /* CONFIG_IPV6 */
148 if (hapd
->conf
->nas_identifier
&&
149 !radius_msg_add_attr(msg
, RADIUS_ATTR_NAS_IDENTIFIER
,
150 (u8
*) hapd
->conf
->nas_identifier
,
151 strlen(hapd
->conf
->nas_identifier
))) {
152 printf("Could not add NAS-Identifier\n");
156 snprintf(buf
, sizeof(buf
), RADIUS_802_1X_ADDR_FORMAT
":%s",
157 MAC2STR(hapd
->own_addr
), hapd
->conf
->ssid
);
158 if (!radius_msg_add_attr(msg
, RADIUS_ATTR_CALLED_STATION_ID
,
159 (u8
*) buf
, strlen(buf
))) {
160 printf("Could not add Called-Station-Id\n");
164 snprintf(buf
, sizeof(buf
), RADIUS_802_1X_ADDR_FORMAT
,
166 if (!radius_msg_add_attr(msg
, RADIUS_ATTR_CALLING_STATION_ID
,
167 (u8
*) buf
, strlen(buf
))) {
168 printf("Could not add Calling-Station-Id\n");
172 if (!radius_msg_add_attr_int32(msg
, RADIUS_ATTR_NAS_PORT_TYPE
,
173 RADIUS_NAS_PORT_TYPE_IEEE_802_11
)) {
174 printf("Could not add NAS-Port-Type\n");
178 snprintf(buf
, sizeof(buf
), "CONNECT 11Mbps 802.11b");
179 if (!radius_msg_add_attr(msg
, RADIUS_ATTR_CONNECT_INFO
,
180 (u8
*) buf
, strlen(buf
))) {
181 printf("Could not add Connect-Info\n");
185 radius_client_send(hapd
->radius
, msg
, RADIUS_AUTH
, addr
);
189 radius_msg_free(msg
);
195 int hostapd_allowed_address(hostapd
*hapd
, u8
*addr
, u8
*msg
, size_t len
,
196 u32
*session_timeout
, u32
*acct_interim_interval
)
198 *session_timeout
= 0;
199 *acct_interim_interval
= 0;
201 if (hostapd_maclist_found(hapd
->conf
->accept_mac
,
202 hapd
->conf
->num_accept_mac
, addr
))
203 return HOSTAPD_ACL_ACCEPT
;
205 if (hostapd_maclist_found(hapd
->conf
->deny_mac
,
206 hapd
->conf
->num_deny_mac
, addr
))
207 return HOSTAPD_ACL_REJECT
;
209 if (hapd
->conf
->macaddr_acl
== ACCEPT_UNLESS_DENIED
)
210 return HOSTAPD_ACL_ACCEPT
;
211 if (hapd
->conf
->macaddr_acl
== DENY_UNLESS_ACCEPTED
)
212 return HOSTAPD_ACL_REJECT
;
214 if (hapd
->conf
->macaddr_acl
== USE_EXTERNAL_RADIUS_AUTH
) {
215 struct hostapd_acl_query_data
*query
;
217 /* Check whether ACL cache has an entry for this station */
218 int res
= hostapd_acl_cache_get(hapd
, addr
, session_timeout
,
219 acct_interim_interval
);
220 if (res
== HOSTAPD_ACL_ACCEPT
||
221 res
== HOSTAPD_ACL_ACCEPT_TIMEOUT
)
223 if (res
== HOSTAPD_ACL_REJECT
)
224 return HOSTAPD_ACL_REJECT
;
226 query
= hapd
->acl_queries
;
228 if (memcmp(query
->addr
, addr
, ETH_ALEN
) == 0) {
229 /* pending query in RADIUS retransmit queue;
230 * do not generate a new one */
231 return HOSTAPD_ACL_PENDING
;
236 if (!hapd
->conf
->radius
->auth_server
)
237 return HOSTAPD_ACL_REJECT
;
239 /* No entry in the cache - query external RADIUS server */
240 query
= malloc(sizeof(*query
));
242 printf("malloc for query data failed\n");
243 return HOSTAPD_ACL_REJECT
;
245 memset(query
, 0, sizeof(*query
));
246 time(&query
->timestamp
);
247 memcpy(query
->addr
, addr
, ETH_ALEN
);
248 if (hostapd_radius_acl_query(hapd
, addr
, query
)) {
249 printf("Failed to send Access-Request for ACL "
251 hostapd_acl_query_free(query
);
252 return HOSTAPD_ACL_REJECT
;
255 query
->auth_msg
= malloc(len
);
256 if (query
->auth_msg
== NULL
) {
257 printf("Failed to allocate memory for auth frame.\n");
258 hostapd_acl_query_free(query
);
259 return HOSTAPD_ACL_REJECT
;
261 memcpy(query
->auth_msg
, msg
, len
);
262 query
->auth_msg_len
= len
;
263 query
->next
= hapd
->acl_queries
;
264 hapd
->acl_queries
= query
;
266 /* Queued data will be processed in hostapd_acl_recv_radius()
267 * when RADIUS server replies to the sent Access-Request. */
268 return HOSTAPD_ACL_PENDING
;
271 return HOSTAPD_ACL_REJECT
;
275 static void hostapd_acl_expire_cache(hostapd
*hapd
, time_t now
)
277 struct hostapd_cached_radius_acl
*prev
, *entry
, *tmp
;
280 entry
= hapd
->acl_cache
;
283 if (now
- entry
->timestamp
> RADIUS_ACL_TIMEOUT
) {
284 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL
,
285 "Cached ACL entry for " MACSTR
286 " has expired.\n", MAC2STR(entry
->addr
));
288 prev
->next
= entry
->next
;
290 hapd
->acl_cache
= entry
->next
;
304 static void hostapd_acl_expire_queries(hostapd
*hapd
, time_t now
)
306 struct hostapd_acl_query_data
*prev
, *entry
, *tmp
;
309 entry
= hapd
->acl_queries
;
312 if (now
- entry
->timestamp
> RADIUS_ACL_TIMEOUT
) {
313 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL
,
314 "ACL query for " MACSTR
315 " has expired.\n", MAC2STR(entry
->addr
));
317 prev
->next
= entry
->next
;
319 hapd
->acl_queries
= entry
->next
;
323 hostapd_acl_query_free(tmp
);
333 static void hostapd_acl_expire(void *eloop_ctx
, void *timeout_ctx
)
335 hostapd
*hapd
= eloop_ctx
;
339 hostapd_acl_expire_cache(hapd
, now
);
340 hostapd_acl_expire_queries(hapd
, now
);
342 eloop_register_timeout(10, 0, hostapd_acl_expire
, hapd
, NULL
);
346 /* Return 0 if RADIUS message was a reply to ACL query (and was processed here)
348 static RadiusRxResult
349 hostapd_acl_recv_radius(struct radius_msg
*msg
, struct radius_msg
*req
,
350 u8
*shared_secret
, size_t shared_secret_len
,
353 struct hostapd_data
*hapd
= data
;
354 struct hostapd_acl_query_data
*query
, *prev
;
355 struct hostapd_cached_radius_acl
*cache
;
357 query
= hapd
->acl_queries
;
360 if (query
->radius_id
== msg
->hdr
->identifier
)
366 return RADIUS_RX_UNKNOWN
;
368 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL
, "Found matching Access-Request "
369 "for RADIUS message (id=%d)\n", query
->radius_id
);
371 if (radius_msg_verify(msg
, shared_secret
, shared_secret_len
, req
, 0)) {
372 printf("Incoming RADIUS packet did not have correct "
373 "authenticator - dropped\n");
374 return RADIUS_RX_INVALID_AUTHENTICATOR
;
377 if (msg
->hdr
->code
!= RADIUS_CODE_ACCESS_ACCEPT
&&
378 msg
->hdr
->code
!= RADIUS_CODE_ACCESS_REJECT
) {
379 printf("Unknown RADIUS message code %d to ACL query\n",
381 return RADIUS_RX_UNKNOWN
;
384 /* Insert Accept/Reject info into ACL cache */
385 cache
= malloc(sizeof(*cache
));
387 printf("Failed to add ACL cache entry\n");
390 memset(cache
, 0, sizeof(*cache
));
391 time(&cache
->timestamp
);
392 memcpy(cache
->addr
, query
->addr
, sizeof(cache
->addr
));
393 if (msg
->hdr
->code
== RADIUS_CODE_ACCESS_ACCEPT
) {
394 if (radius_msg_get_attr_int32(msg
, RADIUS_ATTR_SESSION_TIMEOUT
,
395 &cache
->session_timeout
) == 0)
396 cache
->accepted
= HOSTAPD_ACL_ACCEPT_TIMEOUT
;
398 cache
->accepted
= HOSTAPD_ACL_ACCEPT
;
400 if (radius_msg_get_attr_int32(
401 msg
, RADIUS_ATTR_ACCT_INTERIM_INTERVAL
,
402 &cache
->acct_interim_interval
) == 0 &&
403 cache
->acct_interim_interval
< 60) {
404 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL
, "Ignored too "
405 "small Acct-Interim-Interval %d for "
407 cache
->acct_interim_interval
,
408 MAC2STR(query
->addr
));
409 cache
->acct_interim_interval
= 0;
412 cache
->accepted
= HOSTAPD_ACL_REJECT
;
413 cache
->next
= hapd
->acl_cache
;
414 hapd
->acl_cache
= cache
;
416 /* Re-send original authentication frame for 802.11 processing */
417 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL
, "Re-sending authentication frame "
418 "after successful RADIUS ACL query\n");
419 ieee802_11_mgmt(hapd
, query
->auth_msg
, query
->auth_msg_len
,
424 hapd
->acl_queries
= query
->next
;
426 prev
->next
= query
->next
;
428 hostapd_acl_query_free(query
);
430 return RADIUS_RX_PROCESSED
;
434 int hostapd_acl_init(hostapd
*hapd
)
436 if (radius_client_register(hapd
->radius
, RADIUS_AUTH
,
437 hostapd_acl_recv_radius
, hapd
))
440 eloop_register_timeout(10, 0, hostapd_acl_expire
, hapd
, NULL
);
446 void hostapd_acl_deinit(hostapd
*hapd
)
448 struct hostapd_acl_query_data
*query
, *prev
;
450 hostapd_acl_cache_free(hapd
->acl_cache
);
452 query
= hapd
->acl_queries
;
456 hostapd_acl_query_free(prev
);