3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
13 #include "radius_client.h"
16 /* Defaults for RADIUS retransmit values (exponential backoff) */
19 * RADIUS_CLIENT_FIRST_WAIT - RADIUS client timeout for first retry in seconds
21 #define RADIUS_CLIENT_FIRST_WAIT 3
24 * RADIUS_CLIENT_MAX_WAIT - RADIUS client maximum retry timeout in seconds
26 #define RADIUS_CLIENT_MAX_WAIT 120
29 * RADIUS_CLIENT_MAX_RETRIES - RADIUS client maximum retries
31 * Maximum number of retransmit attempts before the entry is removed from
34 #define RADIUS_CLIENT_MAX_RETRIES 10
37 * RADIUS_CLIENT_MAX_ENTRIES - RADIUS client maximum pending messages
39 * Maximum number of entries in retransmit list (oldest entries will be
40 * removed, if this limit is exceeded).
42 #define RADIUS_CLIENT_MAX_ENTRIES 30
45 * RADIUS_CLIENT_NUM_FAILOVER - RADIUS client failover point
47 * The number of failed retry attempts after which the RADIUS server will be
48 * changed (if one of more backup servers are configured).
50 #define RADIUS_CLIENT_NUM_FAILOVER 4
54 * struct radius_rx_handler - RADIUS client RX handler
56 * This data structure is used internally inside the RADIUS client module to
57 * store registered RX handlers. These handlers are registered by calls to
58 * radius_client_register() and unregistered when the RADIUS client is
59 * deinitialized with a call to radius_client_deinit().
61 struct radius_rx_handler {
63 * handler - Received RADIUS message handler
65 RadiusRxResult (*handler)(struct radius_msg *msg,
66 struct radius_msg *req,
67 const u8 *shared_secret,
68 size_t shared_secret_len,
72 * data - Context data for the handler
79 * struct radius_msg_list - RADIUS client message retransmit list
81 * This data structure is used internally inside the RADIUS client module to
82 * store pending RADIUS requests that may still need to be retransmitted.
84 struct radius_msg_list {
86 * addr - STA/client address
88 * This is used to find RADIUS messages for the same STA.
93 * msg - RADIUS message
95 struct radius_msg *msg;
98 * msg_type - Message type
103 * first_try - Time of the first transmission attempt
108 * next_try - Time for the next transmission attempt
113 * attempts - Number of transmission attempts
118 * next_wait - Next retransmission wait time in seconds
123 * last_attempt - Time of the last transmission attempt
125 struct os_reltime last_attempt;
128 * shared_secret - Shared secret with the target RADIUS server
130 const u8 *shared_secret;
133 * shared_secret_len - shared_secret length in octets
135 size_t shared_secret_len;
137 /* TODO: server config with failover to backup server(s) */
140 * next - Next message in the list
142 struct radius_msg_list *next;
147 * struct radius_client_data - Internal RADIUS client data
149 * This data structure is used internally inside the RADIUS client module.
150 * External users allocate this by calling radius_client_init() and free it by
151 * calling radius_client_deinit(). The pointer to this opaque data is used in
152 * calls to other functions as an identifier for the RADIUS client instance.
154 struct radius_client_data {
156 * ctx - Context pointer for hostapd_logger() callbacks
161 * conf - RADIUS client configuration (list of RADIUS servers to use)
163 struct hostapd_radius_servers *conf;
166 * auth_serv_sock - IPv4 socket for RADIUS authentication messages
171 * acct_serv_sock - IPv4 socket for RADIUS accounting messages
176 * auth_serv_sock6 - IPv6 socket for RADIUS authentication messages
181 * acct_serv_sock6 - IPv6 socket for RADIUS accounting messages
186 * auth_sock - Currently used socket for RADIUS authentication server
191 * acct_sock - Currently used socket for RADIUS accounting server
196 * auth_handlers - Authentication message handlers
198 struct radius_rx_handler *auth_handlers;
201 * num_auth_handlers - Number of handlers in auth_handlers
203 size_t num_auth_handlers;
206 * acct_handlers - Accounting message handlers
208 struct radius_rx_handler *acct_handlers;
211 * num_acct_handlers - Number of handlers in acct_handlers
213 size_t num_acct_handlers;
216 * msgs - Pending outgoing RADIUS messages
218 struct radius_msg_list *msgs;
221 * num_msgs - Number of pending messages in the msgs list
226 * next_radius_identifier - Next RADIUS message identifier to use
228 u8 next_radius_identifier;
233 radius_change_server(struct radius_client_data *radius,
234 struct hostapd_radius_server *nserv,
235 struct hostapd_radius_server *oserv,
236 int sock, int sock6, int auth);
237 static int radius_client_init_acct(struct radius_client_data *radius);
238 static int radius_client_init_auth(struct radius_client_data *radius);
241 static void radius_client_msg_free(struct radius_msg_list *req)
243 radius_msg_free(req->msg);
249 * radius_client_register - Register a RADIUS client RX handler
250 * @radius: RADIUS client context from radius_client_init()
251 * @msg_type: RADIUS client type (RADIUS_AUTH or RADIUS_ACCT)
252 * @handler: Handler for received RADIUS messages
253 * @data: Context pointer for handler callbacks
254 * Returns: 0 on success, -1 on failure
256 * This function is used to register a handler for processing received RADIUS
257 * authentication and accounting messages. The handler() callback function will
258 * be called whenever a RADIUS message is received from the active server.
260 * There can be multiple registered RADIUS message handlers. The handlers will
261 * be called in order until one of them indicates that it has processed or
262 * queued the message.
264 int radius_client_register(struct radius_client_data *radius,
266 RadiusRxResult (*handler)(struct radius_msg *msg,
267 struct radius_msg *req,
268 const u8 *shared_secret,
269 size_t shared_secret_len,
273 struct radius_rx_handler **handlers, *newh;
276 if (msg_type == RADIUS_ACCT) {
277 handlers = &radius->acct_handlers;
278 num = &radius->num_acct_handlers;
280 handlers = &radius->auth_handlers;
281 num = &radius->num_auth_handlers;
284 newh = os_realloc_array(*handlers, *num + 1,
285 sizeof(struct radius_rx_handler));
289 newh[*num].handler = handler;
290 newh[*num].data = data;
298 static void radius_client_handle_send_error(struct radius_client_data *radius,
299 int s, RadiusType msg_type)
301 #ifndef CONFIG_NATIVE_WINDOWS
303 wpa_printf(MSG_INFO, "send[RADIUS]: %s", strerror(errno));
304 if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL ||
306 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
308 "Send failed - maybe interface status changed -"
309 " try to connect again");
310 eloop_unregister_read_sock(s);
312 if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM)
313 radius_client_init_acct(radius);
315 radius_client_init_auth(radius);
317 #endif /* CONFIG_NATIVE_WINDOWS */
321 static int radius_client_retransmit(struct radius_client_data *radius,
322 struct radius_msg_list *entry,
325 struct hostapd_radius_servers *conf = radius->conf;
329 if (entry->msg_type == RADIUS_ACCT ||
330 entry->msg_type == RADIUS_ACCT_INTERIM) {
331 s = radius->acct_sock;
332 if (entry->attempts == 0)
333 conf->acct_server->requests++;
335 conf->acct_server->timeouts++;
336 conf->acct_server->retransmissions++;
339 s = radius->auth_sock;
340 if (entry->attempts == 0)
341 conf->auth_server->requests++;
343 conf->auth_server->timeouts++;
344 conf->auth_server->retransmissions++;
348 /* retransmit; remove entry if too many attempts */
350 hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS,
351 HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)",
352 radius_msg_get_hdr(entry->msg)->identifier);
354 os_get_reltime(&entry->last_attempt);
355 buf = radius_msg_get_buf(entry->msg);
356 if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0)
357 radius_client_handle_send_error(radius, s, entry->msg_type);
359 entry->next_try = now + entry->next_wait;
360 entry->next_wait *= 2;
361 if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
362 entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
363 if (entry->attempts >= RADIUS_CLIENT_MAX_RETRIES) {
364 wpa_printf(MSG_INFO, "RADIUS: Removing un-ACKed message due to too many failed retransmit attempts");
372 static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
374 struct radius_client_data *radius = eloop_ctx;
375 struct hostapd_radius_servers *conf = radius->conf;
376 struct os_reltime now;
378 struct radius_msg_list *entry, *prev, *tmp;
379 int auth_failover = 0, acct_failover = 0;
382 entry = radius->msgs;
386 os_get_reltime(&now);
391 if (now.sec >= entry->next_try &&
392 radius_client_retransmit(radius, entry, now.sec)) {
394 prev->next = entry->next;
396 radius->msgs = entry->next;
400 radius_client_msg_free(tmp);
405 if (entry->attempts > RADIUS_CLIENT_NUM_FAILOVER) {
406 if (entry->msg_type == RADIUS_ACCT ||
407 entry->msg_type == RADIUS_ACCT_INTERIM)
413 if (first == 0 || entry->next_try < first)
414 first = entry->next_try;
423 eloop_register_timeout(first - now.sec, 0,
424 radius_client_timer, radius, NULL);
425 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
426 HOSTAPD_LEVEL_DEBUG, "Next RADIUS client "
427 "retransmit in %ld seconds",
428 (long int) (first - now.sec));
431 if (auth_failover && conf->num_auth_servers > 1) {
432 struct hostapd_radius_server *next, *old;
433 old = conf->auth_server;
434 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
435 HOSTAPD_LEVEL_NOTICE,
436 "No response from Authentication server "
438 hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
441 for (entry = radius->msgs; entry; entry = entry->next) {
442 if (entry->msg_type == RADIUS_AUTH)
447 if (next > &(conf->auth_servers[conf->num_auth_servers - 1]))
448 next = conf->auth_servers;
449 conf->auth_server = next;
450 radius_change_server(radius, next, old,
451 radius->auth_serv_sock,
452 radius->auth_serv_sock6, 1);
455 if (acct_failover && conf->num_acct_servers > 1) {
456 struct hostapd_radius_server *next, *old;
457 old = conf->acct_server;
458 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
459 HOSTAPD_LEVEL_NOTICE,
460 "No response from Accounting server "
462 hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
465 for (entry = radius->msgs; entry; entry = entry->next) {
466 if (entry->msg_type == RADIUS_ACCT ||
467 entry->msg_type == RADIUS_ACCT_INTERIM)
472 if (next > &conf->acct_servers[conf->num_acct_servers - 1])
473 next = conf->acct_servers;
474 conf->acct_server = next;
475 radius_change_server(radius, next, old,
476 radius->acct_serv_sock,
477 radius->acct_serv_sock6, 0);
482 static void radius_client_update_timeout(struct radius_client_data *radius)
484 struct os_reltime now;
486 struct radius_msg_list *entry;
488 eloop_cancel_timeout(radius_client_timer, radius, NULL);
490 if (radius->msgs == NULL) {
495 for (entry = radius->msgs; entry; entry = entry->next) {
496 if (first == 0 || entry->next_try < first)
497 first = entry->next_try;
500 os_get_reltime(&now);
503 eloop_register_timeout(first - now.sec, 0, radius_client_timer, radius,
505 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
506 HOSTAPD_LEVEL_DEBUG, "Next RADIUS client retransmit in"
507 " %ld seconds", (long int) (first - now.sec));
511 static void radius_client_list_add(struct radius_client_data *radius,
512 struct radius_msg *msg,
514 const u8 *shared_secret,
515 size_t shared_secret_len, const u8 *addr)
517 struct radius_msg_list *entry, *prev;
519 if (eloop_terminated()) {
520 /* No point in adding entries to retransmit queue since event
521 * loop has already been terminated. */
522 radius_msg_free(msg);
526 entry = os_zalloc(sizeof(*entry));
528 wpa_printf(MSG_INFO, "RADIUS: Failed to add packet into retransmit list");
529 radius_msg_free(msg);
534 os_memcpy(entry->addr, addr, ETH_ALEN);
536 entry->msg_type = msg_type;
537 entry->shared_secret = shared_secret;
538 entry->shared_secret_len = shared_secret_len;
539 os_get_reltime(&entry->last_attempt);
540 entry->first_try = entry->last_attempt.sec;
541 entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
543 entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
544 entry->next = radius->msgs;
545 radius->msgs = entry;
546 radius_client_update_timeout(radius);
548 if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) {
549 wpa_printf(MSG_INFO, "RADIUS: Removing the oldest un-ACKed packet due to retransmit list limits");
551 while (entry->next) {
557 radius_client_msg_free(entry);
564 static void radius_client_list_del(struct radius_client_data *radius,
565 RadiusType msg_type, const u8 *addr)
567 struct radius_msg_list *entry, *prev, *tmp;
572 entry = radius->msgs;
575 if (entry->msg_type == msg_type &&
576 os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
578 prev->next = entry->next;
580 radius->msgs = entry->next;
583 hostapd_logger(radius->ctx, addr,
584 HOSTAPD_MODULE_RADIUS,
586 "Removing matching RADIUS message");
587 radius_client_msg_free(tmp);
598 * radius_client_send - Send a RADIUS request
599 * @radius: RADIUS client context from radius_client_init()
600 * @msg: RADIUS message to be sent
601 * @msg_type: Message type (RADIUS_AUTH, RADIUS_ACCT, RADIUS_ACCT_INTERIM)
602 * @addr: MAC address of the device related to this message or %NULL
603 * Returns: 0 on success, -1 on failure
605 * This function is used to transmit a RADIUS authentication (RADIUS_AUTH) or
606 * accounting request (RADIUS_ACCT or RADIUS_ACCT_INTERIM). The only difference
607 * between accounting and interim accounting messages is that the interim
608 * message will override any pending interim accounting updates while a new
609 * accounting message does not remove any pending messages.
611 * The message is added on the retransmission queue and will be retransmitted
612 * automatically until a response is received or maximum number of retries
613 * (RADIUS_CLIENT_MAX_RETRIES) is reached.
615 * The related device MAC address can be used to identify pending messages that
616 * can be removed with radius_client_flush_auth() or with interim accounting
619 int radius_client_send(struct radius_client_data *radius,
620 struct radius_msg *msg, RadiusType msg_type,
623 struct hostapd_radius_servers *conf = radius->conf;
624 const u8 *shared_secret;
625 size_t shared_secret_len;
630 if (msg_type == RADIUS_ACCT_INTERIM) {
631 /* Remove any pending interim acct update for the same STA. */
632 radius_client_list_del(radius, msg_type, addr);
635 if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) {
636 if (conf->acct_server == NULL) {
637 hostapd_logger(radius->ctx, NULL,
638 HOSTAPD_MODULE_RADIUS,
640 "No accounting server configured");
643 shared_secret = conf->acct_server->shared_secret;
644 shared_secret_len = conf->acct_server->shared_secret_len;
645 radius_msg_finish_acct(msg, shared_secret, shared_secret_len);
647 s = radius->acct_sock;
648 conf->acct_server->requests++;
650 if (conf->auth_server == NULL) {
651 hostapd_logger(radius->ctx, NULL,
652 HOSTAPD_MODULE_RADIUS,
654 "No authentication server configured");
657 shared_secret = conf->auth_server->shared_secret;
658 shared_secret_len = conf->auth_server->shared_secret_len;
659 radius_msg_finish(msg, shared_secret, shared_secret_len);
660 name = "authentication";
661 s = radius->auth_sock;
662 conf->auth_server->requests++;
665 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
666 HOSTAPD_LEVEL_DEBUG, "Sending RADIUS message to %s "
669 radius_msg_dump(msg);
671 buf = radius_msg_get_buf(msg);
672 res = send(s, wpabuf_head(buf), wpabuf_len(buf), 0);
674 radius_client_handle_send_error(radius, s, msg_type);
676 radius_client_list_add(radius, msg, msg_type, shared_secret,
677 shared_secret_len, addr);
683 static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx)
685 struct radius_client_data *radius = eloop_ctx;
686 struct hostapd_radius_servers *conf = radius->conf;
687 RadiusType msg_type = (RadiusType) sock_ctx;
689 unsigned char buf[3000];
690 struct radius_msg *msg;
691 struct radius_hdr *hdr;
692 struct radius_rx_handler *handlers;
693 size_t num_handlers, i;
694 struct radius_msg_list *req, *prev_req;
695 struct os_reltime now;
696 struct hostapd_radius_server *rconf;
697 int invalid_authenticator = 0;
699 if (msg_type == RADIUS_ACCT) {
700 handlers = radius->acct_handlers;
701 num_handlers = radius->num_acct_handlers;
702 rconf = conf->acct_server;
704 handlers = radius->auth_handlers;
705 num_handlers = radius->num_auth_handlers;
706 rconf = conf->auth_server;
709 len = recv(sock, buf, sizeof(buf), MSG_DONTWAIT);
711 wpa_printf(MSG_INFO, "recv[RADIUS]: %s", strerror(errno));
714 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
715 HOSTAPD_LEVEL_DEBUG, "Received %d bytes from RADIUS "
717 if (len == sizeof(buf)) {
718 wpa_printf(MSG_INFO, "RADIUS: Possibly too long UDP frame for our buffer - dropping it");
722 msg = radius_msg_parse(buf, len);
724 wpa_printf(MSG_INFO, "RADIUS: Parsing incoming frame failed");
725 rconf->malformed_responses++;
728 hdr = radius_msg_get_hdr(msg);
730 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
731 HOSTAPD_LEVEL_DEBUG, "Received RADIUS message");
733 radius_msg_dump(msg);
736 case RADIUS_CODE_ACCESS_ACCEPT:
737 rconf->access_accepts++;
739 case RADIUS_CODE_ACCESS_REJECT:
740 rconf->access_rejects++;
742 case RADIUS_CODE_ACCESS_CHALLENGE:
743 rconf->access_challenges++;
745 case RADIUS_CODE_ACCOUNTING_RESPONSE:
753 /* TODO: also match by src addr:port of the packet when using
754 * alternative RADIUS servers (?) */
755 if ((req->msg_type == msg_type ||
756 (req->msg_type == RADIUS_ACCT_INTERIM &&
757 msg_type == RADIUS_ACCT)) &&
758 radius_msg_get_hdr(req->msg)->identifier ==
767 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
769 "No matching RADIUS request found (type=%d "
770 "id=%d) - dropping packet",
771 msg_type, hdr->identifier);
775 os_get_reltime(&now);
776 roundtrip = (now.sec - req->last_attempt.sec) * 100 +
777 (now.usec - req->last_attempt.usec) / 10000;
778 hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
780 "Received RADIUS packet matched with a pending "
781 "request, round trip time %d.%02d sec",
782 roundtrip / 100, roundtrip % 100);
783 rconf->round_trip_time = roundtrip;
785 /* Remove ACKed RADIUS packet from retransmit list */
787 prev_req->next = req->next;
789 radius->msgs = req->next;
792 for (i = 0; i < num_handlers; i++) {
794 res = handlers[i].handler(msg, req->msg, req->shared_secret,
795 req->shared_secret_len,
798 case RADIUS_RX_PROCESSED:
799 radius_msg_free(msg);
801 case RADIUS_RX_QUEUED:
802 radius_client_msg_free(req);
804 case RADIUS_RX_INVALID_AUTHENTICATOR:
805 invalid_authenticator++;
807 case RADIUS_RX_UNKNOWN:
808 /* continue with next handler */
813 if (invalid_authenticator)
814 rconf->bad_authenticators++;
816 rconf->unknown_types++;
817 hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
818 HOSTAPD_LEVEL_DEBUG, "No RADIUS RX handler found "
819 "(type=%d code=%d id=%d)%s - dropping packet",
820 msg_type, hdr->code, hdr->identifier,
821 invalid_authenticator ? " [INVALID AUTHENTICATOR]" :
823 radius_client_msg_free(req);
826 radius_msg_free(msg);
831 * radius_client_get_id - Get an identifier for a new RADIUS message
832 * @radius: RADIUS client context from radius_client_init()
833 * Returns: Allocated identifier
835 * This function is used to fetch a unique (among pending requests) identifier
836 * for a new RADIUS message.
838 u8 radius_client_get_id(struct radius_client_data *radius)
840 struct radius_msg_list *entry, *prev, *_remove;
841 u8 id = radius->next_radius_identifier++;
843 /* remove entries with matching id from retransmit list to avoid
844 * using new reply from the RADIUS server with an old request */
845 entry = radius->msgs;
848 if (radius_msg_get_hdr(entry->msg)->identifier == id) {
849 hostapd_logger(radius->ctx, entry->addr,
850 HOSTAPD_MODULE_RADIUS,
852 "Removing pending RADIUS message, "
853 "since its id (%d) is reused", id);
855 prev->next = entry->next;
857 radius->msgs = entry->next;
866 radius_client_msg_free(_remove);
874 * radius_client_flush - Flush all pending RADIUS client messages
875 * @radius: RADIUS client context from radius_client_init()
876 * @only_auth: Whether only authentication messages are removed
878 void radius_client_flush(struct radius_client_data *radius, int only_auth)
880 struct radius_msg_list *entry, *prev, *tmp;
886 entry = radius->msgs;
889 if (!only_auth || entry->msg_type == RADIUS_AUTH) {
891 prev->next = entry->next;
893 radius->msgs = entry->next;
897 radius_client_msg_free(tmp);
905 if (radius->msgs == NULL)
906 eloop_cancel_timeout(radius_client_timer, radius, NULL);
910 static void radius_client_update_acct_msgs(struct radius_client_data *radius,
911 const u8 *shared_secret,
912 size_t shared_secret_len)
914 struct radius_msg_list *entry;
919 for (entry = radius->msgs; entry; entry = entry->next) {
920 if (entry->msg_type == RADIUS_ACCT) {
921 entry->shared_secret = shared_secret;
922 entry->shared_secret_len = shared_secret_len;
923 radius_msg_finish_acct(entry->msg, shared_secret,
931 radius_change_server(struct radius_client_data *radius,
932 struct hostapd_radius_server *nserv,
933 struct hostapd_radius_server *oserv,
934 int sock, int sock6, int auth)
936 struct sockaddr_in serv, claddr;
938 struct sockaddr_in6 serv6, claddr6;
939 #endif /* CONFIG_IPV6 */
940 struct sockaddr *addr, *cl_addr;
941 socklen_t addrlen, claddrlen;
944 struct radius_msg_list *entry;
945 struct hostapd_radius_servers *conf = radius->conf;
947 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
950 auth ? "Authentication" : "Accounting",
951 hostapd_ip_txt(&nserv->addr, abuf, sizeof(abuf)),
954 if (!oserv || nserv->shared_secret_len != oserv->shared_secret_len ||
955 os_memcmp(nserv->shared_secret, oserv->shared_secret,
956 nserv->shared_secret_len) != 0) {
957 /* Pending RADIUS packets used different shared secret, so
958 * they need to be modified. Update accounting message
959 * authenticators here. Authentication messages are removed
960 * since they would require more changes and the new RADIUS
961 * server may not be prepared to receive them anyway due to
962 * missing state information. Client will likely retry
963 * authentication, so this should not be an issue. */
965 radius_client_flush(radius, 1);
967 radius_client_update_acct_msgs(
968 radius, nserv->shared_secret,
969 nserv->shared_secret_len);
973 /* Reset retry counters for the new server */
974 for (entry = radius->msgs; entry; entry = entry->next) {
975 if ((auth && entry->msg_type != RADIUS_AUTH) ||
976 (!auth && entry->msg_type != RADIUS_ACCT))
978 entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
980 entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
984 eloop_cancel_timeout(radius_client_timer, radius, NULL);
985 eloop_register_timeout(RADIUS_CLIENT_FIRST_WAIT, 0,
986 radius_client_timer, radius, NULL);
989 switch (nserv->addr.af) {
991 os_memset(&serv, 0, sizeof(serv));
992 serv.sin_family = AF_INET;
993 serv.sin_addr.s_addr = nserv->addr.u.v4.s_addr;
994 serv.sin_port = htons(nserv->port);
995 addr = (struct sockaddr *) &serv;
996 addrlen = sizeof(serv);
1001 os_memset(&serv6, 0, sizeof(serv6));
1002 serv6.sin6_family = AF_INET6;
1003 os_memcpy(&serv6.sin6_addr, &nserv->addr.u.v6,
1004 sizeof(struct in6_addr));
1005 serv6.sin6_port = htons(nserv->port);
1006 addr = (struct sockaddr *) &serv6;
1007 addrlen = sizeof(serv6);
1010 #endif /* CONFIG_IPV6 */
1015 if (conf->force_client_addr) {
1016 switch (conf->client_addr.af) {
1018 os_memset(&claddr, 0, sizeof(claddr));
1019 claddr.sin_family = AF_INET;
1020 claddr.sin_addr.s_addr = conf->client_addr.u.v4.s_addr;
1021 claddr.sin_port = htons(0);
1022 cl_addr = (struct sockaddr *) &claddr;
1023 claddrlen = sizeof(claddr);
1027 os_memset(&claddr6, 0, sizeof(claddr6));
1028 claddr6.sin6_family = AF_INET6;
1029 os_memcpy(&claddr6.sin6_addr, &conf->client_addr.u.v6,
1030 sizeof(struct in6_addr));
1031 claddr6.sin6_port = htons(0);
1032 cl_addr = (struct sockaddr *) &claddr6;
1033 claddrlen = sizeof(claddr6);
1035 #endif /* CONFIG_IPV6 */
1040 if (bind(sel_sock, cl_addr, claddrlen) < 0) {
1041 wpa_printf(MSG_INFO, "bind[radius]: %s",
1047 if (connect(sel_sock, addr, addrlen) < 0) {
1048 wpa_printf(MSG_INFO, "connect[radius]: %s", strerror(errno));
1052 #ifndef CONFIG_NATIVE_WINDOWS
1053 switch (nserv->addr.af) {
1055 claddrlen = sizeof(claddr);
1056 getsockname(sel_sock, (struct sockaddr *) &claddr, &claddrlen);
1057 wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1058 inet_ntoa(claddr.sin_addr), ntohs(claddr.sin_port));
1062 claddrlen = sizeof(claddr6);
1063 getsockname(sel_sock, (struct sockaddr *) &claddr6,
1065 wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1066 inet_ntop(AF_INET6, &claddr6.sin6_addr,
1067 abuf, sizeof(abuf)),
1068 ntohs(claddr6.sin6_port));
1071 #endif /* CONFIG_IPV6 */
1073 #endif /* CONFIG_NATIVE_WINDOWS */
1076 radius->auth_sock = sel_sock;
1078 radius->acct_sock = sel_sock;
1084 static void radius_retry_primary_timer(void *eloop_ctx, void *timeout_ctx)
1086 struct radius_client_data *radius = eloop_ctx;
1087 struct hostapd_radius_servers *conf = radius->conf;
1088 struct hostapd_radius_server *oserv;
1090 if (radius->auth_sock >= 0 && conf->auth_servers &&
1091 conf->auth_server != conf->auth_servers) {
1092 oserv = conf->auth_server;
1093 conf->auth_server = conf->auth_servers;
1094 radius_change_server(radius, conf->auth_server, oserv,
1095 radius->auth_serv_sock,
1096 radius->auth_serv_sock6, 1);
1099 if (radius->acct_sock >= 0 && conf->acct_servers &&
1100 conf->acct_server != conf->acct_servers) {
1101 oserv = conf->acct_server;
1102 conf->acct_server = conf->acct_servers;
1103 radius_change_server(radius, conf->acct_server, oserv,
1104 radius->acct_serv_sock,
1105 radius->acct_serv_sock6, 0);
1108 if (conf->retry_primary_interval)
1109 eloop_register_timeout(conf->retry_primary_interval, 0,
1110 radius_retry_primary_timer, radius,
1115 static int radius_client_disable_pmtu_discovery(int s)
1118 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
1119 /* Turn off Path MTU discovery on IPv4/UDP sockets. */
1120 int action = IP_PMTUDISC_DONT;
1121 r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action,
1124 wpa_printf(MSG_ERROR, "RADIUS: Failed to set IP_MTU_DISCOVER: %s",
1131 static int radius_client_init_auth(struct radius_client_data *radius)
1133 struct hostapd_radius_servers *conf = radius->conf;
1136 radius->auth_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1137 if (radius->auth_serv_sock < 0)
1138 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET,SOCK_DGRAM]: %s",
1141 radius_client_disable_pmtu_discovery(radius->auth_serv_sock);
1146 radius->auth_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1147 if (radius->auth_serv_sock6 < 0)
1148 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET6,SOCK_DGRAM]: %s",
1152 #endif /* CONFIG_IPV6 */
1157 radius_change_server(radius, conf->auth_server, NULL,
1158 radius->auth_serv_sock, radius->auth_serv_sock6,
1161 if (radius->auth_serv_sock >= 0 &&
1162 eloop_register_read_sock(radius->auth_serv_sock,
1163 radius_client_receive, radius,
1164 (void *) RADIUS_AUTH)) {
1165 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for authentication server");
1170 if (radius->auth_serv_sock6 >= 0 &&
1171 eloop_register_read_sock(radius->auth_serv_sock6,
1172 radius_client_receive, radius,
1173 (void *) RADIUS_AUTH)) {
1174 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for authentication server");
1177 #endif /* CONFIG_IPV6 */
1183 static int radius_client_init_acct(struct radius_client_data *radius)
1185 struct hostapd_radius_servers *conf = radius->conf;
1188 radius->acct_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1189 if (radius->acct_serv_sock < 0)
1190 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET,SOCK_DGRAM]: %s",
1193 radius_client_disable_pmtu_discovery(radius->acct_serv_sock);
1198 radius->acct_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1199 if (radius->acct_serv_sock6 < 0)
1200 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET6,SOCK_DGRAM]: %s",
1204 #endif /* CONFIG_IPV6 */
1209 radius_change_server(radius, conf->acct_server, NULL,
1210 radius->acct_serv_sock, radius->acct_serv_sock6,
1213 if (radius->acct_serv_sock >= 0 &&
1214 eloop_register_read_sock(radius->acct_serv_sock,
1215 radius_client_receive, radius,
1216 (void *) RADIUS_ACCT)) {
1217 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for accounting server");
1222 if (radius->acct_serv_sock6 >= 0 &&
1223 eloop_register_read_sock(radius->acct_serv_sock6,
1224 radius_client_receive, radius,
1225 (void *) RADIUS_ACCT)) {
1226 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for accounting server");
1229 #endif /* CONFIG_IPV6 */
1236 * radius_client_init - Initialize RADIUS client
1237 * @ctx: Callback context to be used in hostapd_logger() calls
1238 * @conf: RADIUS client configuration (RADIUS servers)
1239 * Returns: Pointer to private RADIUS client context or %NULL on failure
1241 * The caller is responsible for keeping the configuration data available for
1242 * the lifetime of the RADIUS client, i.e., until radius_client_deinit() is
1243 * called for the returned context pointer.
1245 struct radius_client_data *
1246 radius_client_init(void *ctx, struct hostapd_radius_servers *conf)
1248 struct radius_client_data *radius;
1250 radius = os_zalloc(sizeof(struct radius_client_data));
1255 radius->conf = conf;
1256 radius->auth_serv_sock = radius->acct_serv_sock =
1257 radius->auth_serv_sock6 = radius->acct_serv_sock6 =
1258 radius->auth_sock = radius->acct_sock = -1;
1260 if (conf->auth_server && radius_client_init_auth(radius)) {
1261 radius_client_deinit(radius);
1265 if (conf->acct_server && radius_client_init_acct(radius)) {
1266 radius_client_deinit(radius);
1270 if (conf->retry_primary_interval)
1271 eloop_register_timeout(conf->retry_primary_interval, 0,
1272 radius_retry_primary_timer, radius,
1280 * radius_client_deinit - Deinitialize RADIUS client
1281 * @radius: RADIUS client context from radius_client_init()
1283 void radius_client_deinit(struct radius_client_data *radius)
1288 if (radius->auth_serv_sock >= 0)
1289 eloop_unregister_read_sock(radius->auth_serv_sock);
1290 if (radius->acct_serv_sock >= 0)
1291 eloop_unregister_read_sock(radius->acct_serv_sock);
1293 if (radius->auth_serv_sock6 >= 0)
1294 eloop_unregister_read_sock(radius->auth_serv_sock6);
1295 if (radius->acct_serv_sock6 >= 0)
1296 eloop_unregister_read_sock(radius->acct_serv_sock6);
1297 #endif /* CONFIG_IPV6 */
1299 eloop_cancel_timeout(radius_retry_primary_timer, radius, NULL);
1301 radius_client_flush(radius, 0);
1302 os_free(radius->auth_handlers);
1303 os_free(radius->acct_handlers);
1309 * radius_client_flush_auth - Flush pending RADIUS messages for an address
1310 * @radius: RADIUS client context from radius_client_init()
1311 * @addr: MAC address of the related device
1313 * This function can be used to remove pending RADIUS authentication messages
1314 * that are related to a specific device. The addr parameter is matched with
1315 * the one used in radius_client_send() call that was used to transmit the
1316 * authentication request.
1318 void radius_client_flush_auth(struct radius_client_data *radius,
1321 struct radius_msg_list *entry, *prev, *tmp;
1324 entry = radius->msgs;
1326 if (entry->msg_type == RADIUS_AUTH &&
1327 os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
1328 hostapd_logger(radius->ctx, addr,
1329 HOSTAPD_MODULE_RADIUS,
1330 HOSTAPD_LEVEL_DEBUG,
1331 "Removing pending RADIUS authentication"
1332 " message for removed client");
1335 prev->next = entry->next;
1337 radius->msgs = entry->next;
1340 entry = entry->next;
1341 radius_client_msg_free(tmp);
1347 entry = entry->next;
1352 static int radius_client_dump_auth_server(char *buf, size_t buflen,
1353 struct hostapd_radius_server *serv,
1354 struct radius_client_data *cli)
1357 struct radius_msg_list *msg;
1361 for (msg = cli->msgs; msg; msg = msg->next) {
1362 if (msg->msg_type == RADIUS_AUTH)
1367 return os_snprintf(buf, buflen,
1368 "radiusAuthServerIndex=%d\n"
1369 "radiusAuthServerAddress=%s\n"
1370 "radiusAuthClientServerPortNumber=%d\n"
1371 "radiusAuthClientRoundTripTime=%d\n"
1372 "radiusAuthClientAccessRequests=%u\n"
1373 "radiusAuthClientAccessRetransmissions=%u\n"
1374 "radiusAuthClientAccessAccepts=%u\n"
1375 "radiusAuthClientAccessRejects=%u\n"
1376 "radiusAuthClientAccessChallenges=%u\n"
1377 "radiusAuthClientMalformedAccessResponses=%u\n"
1378 "radiusAuthClientBadAuthenticators=%u\n"
1379 "radiusAuthClientPendingRequests=%u\n"
1380 "radiusAuthClientTimeouts=%u\n"
1381 "radiusAuthClientUnknownTypes=%u\n"
1382 "radiusAuthClientPacketsDropped=%u\n",
1384 hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1386 serv->round_trip_time,
1388 serv->retransmissions,
1389 serv->access_accepts,
1390 serv->access_rejects,
1391 serv->access_challenges,
1392 serv->malformed_responses,
1393 serv->bad_authenticators,
1396 serv->unknown_types,
1397 serv->packets_dropped);
1401 static int radius_client_dump_acct_server(char *buf, size_t buflen,
1402 struct hostapd_radius_server *serv,
1403 struct radius_client_data *cli)
1406 struct radius_msg_list *msg;
1410 for (msg = cli->msgs; msg; msg = msg->next) {
1411 if (msg->msg_type == RADIUS_ACCT ||
1412 msg->msg_type == RADIUS_ACCT_INTERIM)
1417 return os_snprintf(buf, buflen,
1418 "radiusAccServerIndex=%d\n"
1419 "radiusAccServerAddress=%s\n"
1420 "radiusAccClientServerPortNumber=%d\n"
1421 "radiusAccClientRoundTripTime=%d\n"
1422 "radiusAccClientRequests=%u\n"
1423 "radiusAccClientRetransmissions=%u\n"
1424 "radiusAccClientResponses=%u\n"
1425 "radiusAccClientMalformedResponses=%u\n"
1426 "radiusAccClientBadAuthenticators=%u\n"
1427 "radiusAccClientPendingRequests=%u\n"
1428 "radiusAccClientTimeouts=%u\n"
1429 "radiusAccClientUnknownTypes=%u\n"
1430 "radiusAccClientPacketsDropped=%u\n",
1432 hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1434 serv->round_trip_time,
1436 serv->retransmissions,
1438 serv->malformed_responses,
1439 serv->bad_authenticators,
1442 serv->unknown_types,
1443 serv->packets_dropped);
1448 * radius_client_get_mib - Get RADIUS client MIB information
1449 * @radius: RADIUS client context from radius_client_init()
1450 * @buf: Buffer for returning MIB data in text format
1451 * @buflen: Maximum buf length in octets
1452 * Returns: Number of octets written into the buffer
1454 int radius_client_get_mib(struct radius_client_data *radius, char *buf,
1457 struct hostapd_radius_servers *conf = radius->conf;
1459 struct hostapd_radius_server *serv;
1462 if (conf->auth_servers) {
1463 for (i = 0; i < conf->num_auth_servers; i++) {
1464 serv = &conf->auth_servers[i];
1465 count += radius_client_dump_auth_server(
1466 buf + count, buflen - count, serv,
1467 serv == conf->auth_server ?
1472 if (conf->acct_servers) {
1473 for (i = 0; i < conf->num_acct_servers; i++) {
1474 serv = &conf->acct_servers[i];
1475 count += radius_client_dump_acct_server(
1476 buf + count, buflen - count, serv,
1477 serv == conf->acct_server ?
1486 void radius_client_reconfig(struct radius_client_data *radius,
1487 struct hostapd_radius_servers *conf)
1490 radius->conf = conf;