1 /*
2 * RADIUS client
3 * Copyright (c) 2002-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10 #include <net/if.h>
11
12 #include "common.h"
13 #include "radius.h"
14 #include "radius_client.h"
15 #include "eloop.h"
16
17 /* Defaults for RADIUS retransmit values (exponential backoff) */
18
19 /**
20 * RADIUS_CLIENT_FIRST_WAIT - RADIUS client timeout for first retry in seconds
21 */
22 #define RADIUS_CLIENT_FIRST_WAIT 3
23
24 /**
25 * RADIUS_CLIENT_MAX_WAIT - RADIUS client maximum retry timeout in seconds
26 */
27 #define RADIUS_CLIENT_MAX_WAIT 120
28
29 /**
30 * RADIUS_CLIENT_MAX_FAILOVER - RADIUS client maximum retries
31 *
32 * Maximum number of server failovers before the entry is removed from
33 * retransmit list.
34 */
35 #define RADIUS_CLIENT_MAX_FAILOVER 3
36
37 /**
38 * RADIUS_CLIENT_MAX_ENTRIES - RADIUS client maximum pending messages
39 *
40 * Maximum number of entries in retransmit list (oldest entries will be
41 * removed, if this limit is exceeded).
42 */
43 #define RADIUS_CLIENT_MAX_ENTRIES 30
44
45 /**
46 * RADIUS_CLIENT_NUM_FAILOVER - RADIUS client failover point
47 *
48 * The number of failed retry attempts after which the RADIUS server will be
49 * changed (if one of more backup servers are configured).
50 */
51 #define RADIUS_CLIENT_NUM_FAILOVER 4
52
53
54 /**
55 * struct radius_rx_handler - RADIUS client RX handler
56 *
57 * This data structure is used internally inside the RADIUS client module to
58 * store registered RX handlers. These handlers are registered by calls to
59 * radius_client_register() and unregistered when the RADIUS client is
60 * deinitialized with a call to radius_client_deinit().
61 */
62 struct radius_rx_handler {
63 /**
64 * handler - Received RADIUS message handler
65 */
66 RadiusRxResult (*handler)(struct radius_msg *msg,
67 struct radius_msg *req,
68 const u8 *shared_secret,
69 size_t shared_secret_len,
70 void *data);
71
72 /**
73 * data - Context data for the handler
74 */
75 void *data;
76 };
77
78
79 /**
80 * struct radius_msg_list - RADIUS client message retransmit list
81 *
82 * This data structure is used internally inside the RADIUS client module to
83 * store pending RADIUS requests that may still need to be retransmitted.
84 */
85 struct radius_msg_list {
86 /**
87 * addr - STA/client address
88 *
89 * This is used to find RADIUS messages for the same STA.
90 */
91 u8 addr[ETH_ALEN];
92
93 /**
94 * msg - RADIUS message
95 */
96 struct radius_msg *msg;
97
98 /**
99 * msg_type - Message type
100 */
101 RadiusType msg_type;
102
103 /**
104 * first_try - Time of the first transmission attempt
105 */
106 os_time_t first_try;
107
108 /**
109 * next_try - Time for the next transmission attempt
110 */
111 os_time_t next_try;
112
113 /**
114 * attempts - Number of transmission attempts for one server
115 */
116 int attempts;
117
118 /**
119 * accu_attempts - Number of accumulated attempts
120 */
121 int accu_attempts;
122
123 /**
124 * next_wait - Next retransmission wait time in seconds
125 */
126 int next_wait;
127
128 /**
129 * last_attempt - Time of the last transmission attempt
130 */
131 struct os_reltime last_attempt;
132
133 /**
134 * shared_secret - Shared secret with the target RADIUS server
135 */
136 const u8 *shared_secret;
137
138 /**
139 * shared_secret_len - shared_secret length in octets
140 */
141 size_t shared_secret_len;
142
143 /* TODO: server config with failover to backup server(s) */
144
145 /**
146 * next - Next message in the list
147 */
148 struct radius_msg_list *next;
149 };
150
151
152 /**
153 * struct radius_client_data - Internal RADIUS client data
154 *
155 * This data structure is used internally inside the RADIUS client module.
156 * External users allocate this by calling radius_client_init() and free it by
157 * calling radius_client_deinit(). The pointer to this opaque data is used in
158 * calls to other functions as an identifier for the RADIUS client instance.
159 */
160 struct radius_client_data {
161 /**
162 * ctx - Context pointer for hostapd_logger() callbacks
163 */
164 void *ctx;
165
166 /**
167 * conf - RADIUS client configuration (list of RADIUS servers to use)
168 */
169 struct hostapd_radius_servers *conf;
170
171 /**
172 * auth_serv_sock - IPv4 socket for RADIUS authentication messages
173 */
174 int auth_serv_sock;
175
176 /**
177 * acct_serv_sock - IPv4 socket for RADIUS accounting messages
178 */
179 int acct_serv_sock;
180
181 /**
182 * auth_serv_sock6 - IPv6 socket for RADIUS authentication messages
183 */
184 int auth_serv_sock6;
185
186 /**
187 * acct_serv_sock6 - IPv6 socket for RADIUS accounting messages
188 */
189 int acct_serv_sock6;
190
191 /**
192 * auth_sock - Currently used socket for RADIUS authentication server
193 */
194 int auth_sock;
195
196 /**
197 * acct_sock - Currently used socket for RADIUS accounting server
198 */
199 int acct_sock;
200
201 /**
202 * auth_handlers - Authentication message handlers
203 */
204 struct radius_rx_handler *auth_handlers;
205
206 /**
207 * num_auth_handlers - Number of handlers in auth_handlers
208 */
209 size_t num_auth_handlers;
210
211 /**
212 * acct_handlers - Accounting message handlers
213 */
214 struct radius_rx_handler *acct_handlers;
215
216 /**
217 * num_acct_handlers - Number of handlers in acct_handlers
218 */
219 size_t num_acct_handlers;
220
221 /**
222 * msgs - Pending outgoing RADIUS messages
223 */
224 struct radius_msg_list *msgs;
225
226 /**
227 * num_msgs - Number of pending messages in the msgs list
228 */
229 size_t num_msgs;
230
231 /**
232 * next_radius_identifier - Next RADIUS message identifier to use
233 */
234 u8 next_radius_identifier;
235
236 /**
237 * interim_error_cb - Interim accounting error callback
238 */
239 void (*interim_error_cb)(const u8 *addr, void *ctx);
240
241 /**
242 * interim_error_cb_ctx - interim_error_cb() context data
243 */
244 void *interim_error_cb_ctx;
245 };
246
247
248 static int
249 radius_change_server(struct radius_client_data *radius,
250 struct hostapd_radius_server *nserv,
251 struct hostapd_radius_server *oserv,
252 int sock, int sock6, int auth);
253 static int radius_client_init_acct(struct radius_client_data *radius);
254 static int radius_client_init_auth(struct radius_client_data *radius);
255 static void radius_client_auth_failover(struct radius_client_data *radius);
256 static void radius_client_acct_failover(struct radius_client_data *radius);
257
258
radius_client_msg_free(struct radius_msg_list * req)259 static void radius_client_msg_free(struct radius_msg_list *req)
260 {
261 radius_msg_free(req->msg);
262 os_free(req);
263 }
264
265
266 /**
267 * radius_client_register - Register a RADIUS client RX handler
268 * @radius: RADIUS client context from radius_client_init()
269 * @msg_type: RADIUS client type (RADIUS_AUTH or RADIUS_ACCT)
270 * @handler: Handler for received RADIUS messages
271 * @data: Context pointer for handler callbacks
272 * Returns: 0 on success, -1 on failure
273 *
274 * This function is used to register a handler for processing received RADIUS
275 * authentication and accounting messages. The handler() callback function will
276 * be called whenever a RADIUS message is received from the active server.
277 *
278 * There can be multiple registered RADIUS message handlers. The handlers will
279 * be called in order until one of them indicates that it has processed or
280 * queued the message.
281 */
radius_client_register(struct radius_client_data * radius,RadiusType msg_type,RadiusRxResult (* handler)(struct radius_msg * msg,struct radius_msg * req,const u8 * shared_secret,size_t shared_secret_len,void * data),void * data)282 int radius_client_register(struct radius_client_data *radius,
283 RadiusType msg_type,
284 RadiusRxResult (*handler)(struct radius_msg *msg,
285 struct radius_msg *req,
286 const u8 *shared_secret,
287 size_t shared_secret_len,
288 void *data),
289 void *data)
290 {
291 struct radius_rx_handler **handlers, *newh;
292 size_t *num;
293
294 if (msg_type == RADIUS_ACCT) {
295 handlers = &radius->acct_handlers;
296 num = &radius->num_acct_handlers;
297 } else {
298 handlers = &radius->auth_handlers;
299 num = &radius->num_auth_handlers;
300 }
301
302 newh = os_realloc_array(*handlers, *num + 1,
303 sizeof(struct radius_rx_handler));
304 if (newh == NULL)
305 return -1;
306
307 newh[*num].handler = handler;
308 newh[*num].data = data;
309 (*num)++;
310 *handlers = newh;
311
312 return 0;
313 }
314
315
316 /**
317 * radius_client_set_interim_erro_cb - Register an interim acct error callback
318 * @radius: RADIUS client context from radius_client_init()
319 * @addr: Station address from the failed message
320 * @cb: Handler for interim accounting errors
321 * @ctx: Context pointer for handler callbacks
322 *
323 * This function is used to register a handler for processing failed
324 * transmission attempts of interim accounting update messages.
325 */
radius_client_set_interim_error_cb(struct radius_client_data * radius,void (* cb)(const u8 * addr,void * ctx),void * ctx)326 void radius_client_set_interim_error_cb(struct radius_client_data *radius,
327 void (*cb)(const u8 *addr, void *ctx),
328 void *ctx)
329 {
330 radius->interim_error_cb = cb;
331 radius->interim_error_cb_ctx = ctx;
332 }
333
334
335 /*
336 * Returns >0 if message queue was flushed (i.e., the message that triggered
337 * the error is not available anymore)
338 */
radius_client_handle_send_error(struct radius_client_data * radius,int s,RadiusType msg_type)339 static int radius_client_handle_send_error(struct radius_client_data *radius,
340 int s, RadiusType msg_type)
341 {
342 #ifndef CONFIG_NATIVE_WINDOWS
343 int _errno = errno;
344 wpa_printf(MSG_INFO, "send[RADIUS,s=%d]: %s", s, strerror(errno));
345 if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL ||
346 _errno == EBADF || _errno == ENETUNREACH || _errno == EACCES) {
347 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
348 HOSTAPD_LEVEL_INFO,
349 "Send failed - maybe interface status changed -"
350 " try to connect again");
351 if (msg_type == RADIUS_ACCT ||
352 msg_type == RADIUS_ACCT_INTERIM) {
353 radius_client_init_acct(radius);
354 return 0;
355 } else {
356 radius_client_init_auth(radius);
357 return 1;
358 }
359 }
360 #endif /* CONFIG_NATIVE_WINDOWS */
361
362 return 0;
363 }
364
365
radius_client_retransmit(struct radius_client_data * radius,struct radius_msg_list * entry,os_time_t now)366 static int radius_client_retransmit(struct radius_client_data *radius,
367 struct radius_msg_list *entry,
368 os_time_t now)
369 {
370 struct hostapd_radius_servers *conf = radius->conf;
371 int s;
372 struct wpabuf *buf;
373 size_t prev_num_msgs;
374 u8 *acct_delay_time;
375 size_t acct_delay_time_len;
376 int num_servers;
377
378 if (entry->msg_type == RADIUS_ACCT ||
379 entry->msg_type == RADIUS_ACCT_INTERIM) {
380 num_servers = conf->num_acct_servers;
381 if (radius->acct_sock < 0)
382 radius_client_init_acct(radius);
383 if (radius->acct_sock < 0 && conf->num_acct_servers > 1) {
384 prev_num_msgs = radius->num_msgs;
385 radius_client_acct_failover(radius);
386 if (prev_num_msgs != radius->num_msgs)
387 return 0;
388 }
389 s = radius->acct_sock;
390 if (entry->attempts == 0)
391 conf->acct_server->requests++;
392 else {
393 conf->acct_server->timeouts++;
394 conf->acct_server->retransmissions++;
395 }
396 } else {
397 num_servers = conf->num_auth_servers;
398 if (radius->auth_sock < 0)
399 radius_client_init_auth(radius);
400 if (radius->auth_sock < 0 && conf->num_auth_servers > 1) {
401 prev_num_msgs = radius->num_msgs;
402 radius_client_auth_failover(radius);
403 if (prev_num_msgs != radius->num_msgs)
404 return 0;
405 }
406 s = radius->auth_sock;
407 if (entry->attempts == 0)
408 conf->auth_server->requests++;
409 else {
410 conf->auth_server->timeouts++;
411 conf->auth_server->retransmissions++;
412 }
413 }
414
415 if (entry->msg_type == RADIUS_ACCT_INTERIM) {
416 wpa_printf(MSG_DEBUG,
417 "RADIUS: Failed to transmit interim accounting update to "
418 MACSTR " - drop message and request a new update",
419 MAC2STR(entry->addr));
420 if (radius->interim_error_cb)
421 radius->interim_error_cb(entry->addr,
422 radius->interim_error_cb_ctx);
423 return 1;
424 }
425
426 if (s < 0) {
427 wpa_printf(MSG_INFO,
428 "RADIUS: No valid socket for retransmission");
429 return 1;
430 }
431
432 if (entry->msg_type == RADIUS_ACCT &&
433 radius_msg_get_attr_ptr(entry->msg, RADIUS_ATTR_ACCT_DELAY_TIME,
434 &acct_delay_time, &acct_delay_time_len,
435 NULL) == 0 &&
436 acct_delay_time_len == 4) {
437 struct radius_hdr *hdr;
438 u32 delay_time;
439
440 /*
441 * Need to assign a new identifier since attribute contents
442 * changes.
443 */
444 hdr = radius_msg_get_hdr(entry->msg);
445 hdr->identifier = radius_client_get_id(radius);
446
447 /* Update Acct-Delay-Time to show wait time in queue */
448 delay_time = now - entry->first_try;
449 WPA_PUT_BE32(acct_delay_time, delay_time);
450
451 wpa_printf(MSG_DEBUG,
452 "RADIUS: Updated Acct-Delay-Time to %u for retransmission",
453 delay_time);
454 radius_msg_finish_acct(entry->msg, entry->shared_secret,
455 entry->shared_secret_len);
456 if (radius->conf->msg_dumps)
457 radius_msg_dump(entry->msg);
458 }
459
460 /* retransmit; remove entry if too many attempts */
461 if (entry->accu_attempts >= RADIUS_CLIENT_MAX_FAILOVER *
462 RADIUS_CLIENT_NUM_FAILOVER * num_servers) {
463 wpa_printf(MSG_INFO,
464 "RADIUS: Removing un-ACKed message due to too many failed retransmit attempts");
465 return 1;
466 }
467
468 entry->attempts++;
469 entry->accu_attempts++;
470 hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS,
471 HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)",
472 radius_msg_get_hdr(entry->msg)->identifier);
473
474 os_get_reltime(&entry->last_attempt);
475 buf = radius_msg_get_buf(entry->msg);
476 if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0) {
477 if (radius_client_handle_send_error(radius, s, entry->msg_type)
478 > 0)
479 return 0;
480 }
481
482 entry->next_try = now + entry->next_wait;
483 entry->next_wait *= 2;
484 if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
485 entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
486
487 return 0;
488 }
489
490
radius_client_timer(void * eloop_ctx,void * timeout_ctx)491 static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
492 {
493 struct radius_client_data *radius = eloop_ctx;
494 struct os_reltime now;
495 os_time_t first;
496 struct radius_msg_list *entry, *prev, *tmp;
497 int auth_failover = 0, acct_failover = 0;
498 size_t prev_num_msgs;
499 int s;
500
501 entry = radius->msgs;
502 if (!entry)
503 return;
504
505 os_get_reltime(&now);
506
507 while (entry) {
508 if (now.sec >= entry->next_try) {
509 s = entry->msg_type == RADIUS_AUTH ? radius->auth_sock :
510 radius->acct_sock;
511 if (entry->attempts >= RADIUS_CLIENT_NUM_FAILOVER ||
512 (s < 0 && entry->attempts > 0)) {
513 if (entry->msg_type == RADIUS_ACCT ||
514 entry->msg_type == RADIUS_ACCT_INTERIM)
515 acct_failover++;
516 else
517 auth_failover++;
518 }
519 }
520 entry = entry->next;
521 }
522
523 if (auth_failover)
524 radius_client_auth_failover(radius);
525
526 if (acct_failover)
527 radius_client_acct_failover(radius);
528
529 entry = radius->msgs;
530 first = 0;
531
532 prev = NULL;
533 while (entry) {
534 prev_num_msgs = radius->num_msgs;
535 if (now.sec >= entry->next_try &&
536 radius_client_retransmit(radius, entry, now.sec)) {
537 if (prev)
538 prev->next = entry->next;
539 else
540 radius->msgs = entry->next;
541
542 tmp = entry;
543 entry = entry->next;
544 radius_client_msg_free(tmp);
545 radius->num_msgs--;
546 continue;
547 }
548
549 if (prev_num_msgs != radius->num_msgs) {
550 wpa_printf(MSG_DEBUG,
551 "RADIUS: Message removed from queue - restart from beginning");
552 entry = radius->msgs;
553 prev = NULL;
554 continue;
555 }
556
557 if (first == 0 || entry->next_try < first)
558 first = entry->next_try;
559
560 prev = entry;
561 entry = entry->next;
562 }
563
564 if (radius->msgs) {
565 if (first < now.sec)
566 first = now.sec;
567 eloop_cancel_timeout(radius_client_timer, radius, NULL);
568 eloop_register_timeout(first - now.sec, 0,
569 radius_client_timer, radius, NULL);
570 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
571 HOSTAPD_LEVEL_DEBUG, "Next RADIUS client "
572 "retransmit in %ld seconds",
573 (long int) (first - now.sec));
574 }
575 }
576
577
radius_client_auth_failover(struct radius_client_data * radius)578 static void radius_client_auth_failover(struct radius_client_data *radius)
579 {
580 struct hostapd_radius_servers *conf = radius->conf;
581 struct hostapd_radius_server *next, *old;
582 struct radius_msg_list *entry;
583 char abuf[50];
584
585 old = conf->auth_server;
586 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
587 HOSTAPD_LEVEL_NOTICE,
588 "No response from Authentication server %s:%d - failover",
589 hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
590 old->port);
591
592 for (entry = radius->msgs; entry; entry = entry->next) {
593 if (entry->msg_type == RADIUS_AUTH)
594 old->timeouts++;
595 }
596
597 next = old + 1;
598 if (next > &(conf->auth_servers[conf->num_auth_servers - 1]))
599 next = conf->auth_servers;
600 conf->auth_server = next;
601 radius_change_server(radius, next, old,
602 radius->auth_serv_sock,
603 radius->auth_serv_sock6, 1);
604 }
605
606
radius_client_acct_failover(struct radius_client_data * radius)607 static void radius_client_acct_failover(struct radius_client_data *radius)
608 {
609 struct hostapd_radius_servers *conf = radius->conf;
610 struct hostapd_radius_server *next, *old;
611 struct radius_msg_list *entry;
612 char abuf[50];
613
614 old = conf->acct_server;
615 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
616 HOSTAPD_LEVEL_NOTICE,
617 "No response from Accounting server %s:%d - failover",
618 hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
619 old->port);
620
621 for (entry = radius->msgs; entry; entry = entry->next) {
622 if (entry->msg_type == RADIUS_ACCT ||
623 entry->msg_type == RADIUS_ACCT_INTERIM)
624 old->timeouts++;
625 }
626
627 next = old + 1;
628 if (next > &conf->acct_servers[conf->num_acct_servers - 1])
629 next = conf->acct_servers;
630 conf->acct_server = next;
631 radius_change_server(radius, next, old,
632 radius->acct_serv_sock,
633 radius->acct_serv_sock6, 0);
634 }
635
636
radius_client_update_timeout(struct radius_client_data * radius)637 static void radius_client_update_timeout(struct radius_client_data *radius)
638 {
639 struct os_reltime now;
640 os_time_t first;
641 struct radius_msg_list *entry;
642
643 eloop_cancel_timeout(radius_client_timer, radius, NULL);
644
645 if (radius->msgs == NULL) {
646 return;
647 }
648
649 first = 0;
650 for (entry = radius->msgs; entry; entry = entry->next) {
651 if (first == 0 || entry->next_try < first)
652 first = entry->next_try;
653 }
654
655 os_get_reltime(&now);
656 if (first < now.sec)
657 first = now.sec;
658 eloop_register_timeout(first - now.sec, 0, radius_client_timer, radius,
659 NULL);
660 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
661 HOSTAPD_LEVEL_DEBUG, "Next RADIUS client retransmit in"
662 " %ld seconds", (long int) (first - now.sec));
663 }
664
665
radius_client_list_add(struct radius_client_data * radius,struct radius_msg * msg,RadiusType msg_type,const u8 * shared_secret,size_t shared_secret_len,const u8 * addr)666 static void radius_client_list_add(struct radius_client_data *radius,
667 struct radius_msg *msg,
668 RadiusType msg_type,
669 const u8 *shared_secret,
670 size_t shared_secret_len, const u8 *addr)
671 {
672 struct radius_msg_list *entry, *prev;
673
674 if (eloop_terminated()) {
675 /* No point in adding entries to retransmit queue since event
676 * loop has already been terminated. */
677 radius_msg_free(msg);
678 return;
679 }
680
681 entry = os_zalloc(sizeof(*entry));
682 if (entry == NULL) {
683 wpa_printf(MSG_INFO, "RADIUS: Failed to add packet into retransmit list");
684 radius_msg_free(msg);
685 return;
686 }
687
688 if (addr)
689 os_memcpy(entry->addr, addr, ETH_ALEN);
690 entry->msg = msg;
691 entry->msg_type = msg_type;
692 entry->shared_secret = shared_secret;
693 entry->shared_secret_len = shared_secret_len;
694 os_get_reltime(&entry->last_attempt);
695 entry->first_try = entry->last_attempt.sec;
696 entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
697 entry->attempts = 1;
698 entry->accu_attempts = 1;
699 entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
700 if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
701 entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
702 entry->next = radius->msgs;
703 radius->msgs = entry;
704 radius_client_update_timeout(radius);
705
706 if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) {
707 wpa_printf(MSG_INFO, "RADIUS: Removing the oldest un-ACKed packet due to retransmit list limits");
708 prev = NULL;
709 while (entry->next) {
710 prev = entry;
711 entry = entry->next;
712 }
713 if (prev) {
714 prev->next = NULL;
715 radius_client_msg_free(entry);
716 }
717 } else
718 radius->num_msgs++;
719 }
720
721
722 /**
723 * radius_client_send - Send a RADIUS request
724 * @radius: RADIUS client context from radius_client_init()
725 * @msg: RADIUS message to be sent
726 * @msg_type: Message type (RADIUS_AUTH, RADIUS_ACCT, RADIUS_ACCT_INTERIM)
727 * @addr: MAC address of the device related to this message or %NULL
728 * Returns: 0 on success, -1 on failure
729 *
730 * This function is used to transmit a RADIUS authentication (RADIUS_AUTH) or
731 * accounting request (RADIUS_ACCT or RADIUS_ACCT_INTERIM). The only difference
732 * between accounting and interim accounting messages is that the interim
733 * message will not be retransmitted. Instead, a callback is used to indicate
734 * that the transmission failed for the specific station @addr so that a new
735 * interim accounting update message can be generated with up-to-date session
736 * data instead of trying to resend old information.
737 *
738 * The message is added on the retransmission queue and will be retransmitted
739 * automatically until a response is received or maximum number of retries
740 * (RADIUS_CLIENT_MAX_FAILOVER * RADIUS_CLIENT_NUM_FAILOVER) is reached. No
741 * such retries are used with RADIUS_ACCT_INTERIM, i.e., such a pending message
742 * is removed from the queue automatically on transmission failure.
743 *
744 * The related device MAC address can be used to identify pending messages that
745 * can be removed with radius_client_flush_auth().
746 */
radius_client_send(struct radius_client_data * radius,struct radius_msg * msg,RadiusType msg_type,const u8 * addr)747 int radius_client_send(struct radius_client_data *radius,
748 struct radius_msg *msg, RadiusType msg_type,
749 const u8 *addr)
750 {
751 struct hostapd_radius_servers *conf = radius->conf;
752 const u8 *shared_secret;
753 size_t shared_secret_len;
754 char *name;
755 int s, res;
756 struct wpabuf *buf;
757
758 if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) {
759 if (conf->acct_server && radius->acct_sock < 0)
760 radius_client_init_acct(radius);
761
762 if (conf->acct_server == NULL || radius->acct_sock < 0 ||
763 conf->acct_server->shared_secret == NULL) {
764 hostapd_logger(radius->ctx, NULL,
765 HOSTAPD_MODULE_RADIUS,
766 HOSTAPD_LEVEL_INFO,
767 "No accounting server configured");
768 return -1;
769 }
770 shared_secret = conf->acct_server->shared_secret;
771 shared_secret_len = conf->acct_server->shared_secret_len;
772 radius_msg_finish_acct(msg, shared_secret, shared_secret_len);
773 name = "accounting";
774 s = radius->acct_sock;
775 conf->acct_server->requests++;
776 } else {
777 if (conf->auth_server && radius->auth_sock < 0)
778 radius_client_init_auth(radius);
779
780 if (conf->auth_server == NULL || radius->auth_sock < 0 ||
781 conf->auth_server->shared_secret == NULL) {
782 hostapd_logger(radius->ctx, NULL,
783 HOSTAPD_MODULE_RADIUS,
784 HOSTAPD_LEVEL_INFO,
785 "No authentication server configured");
786 return -1;
787 }
788 shared_secret = conf->auth_server->shared_secret;
789 shared_secret_len = conf->auth_server->shared_secret_len;
790 radius_msg_finish(msg, shared_secret, shared_secret_len);
791 name = "authentication";
792 s = radius->auth_sock;
793 conf->auth_server->requests++;
794 }
795
796 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
797 HOSTAPD_LEVEL_DEBUG, "Sending RADIUS message to %s "
798 "server", name);
799 if (conf->msg_dumps)
800 radius_msg_dump(msg);
801
802 buf = radius_msg_get_buf(msg);
803 res = send(s, wpabuf_head(buf), wpabuf_len(buf), 0);
804 if (res < 0)
805 radius_client_handle_send_error(radius, s, msg_type);
806
807 radius_client_list_add(radius, msg, msg_type, shared_secret,
808 shared_secret_len, addr);
809
810 return 0;
811 }
812
813
radius_client_receive(int sock,void * eloop_ctx,void * sock_ctx)814 static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx)
815 {
816 struct radius_client_data *radius = eloop_ctx;
817 struct hostapd_radius_servers *conf = radius->conf;
818 RadiusType msg_type = (uintptr_t) sock_ctx;
819 int len, roundtrip;
820 unsigned char buf[RADIUS_MAX_MSG_LEN];
821 struct msghdr msghdr = {0};
822 struct iovec iov;
823 struct radius_msg *msg;
824 struct radius_hdr *hdr;
825 struct radius_rx_handler *handlers;
826 size_t num_handlers, i;
827 struct radius_msg_list *req, *prev_req;
828 struct os_reltime now;
829 struct hostapd_radius_server *rconf;
830 int invalid_authenticator = 0;
831
832 if (msg_type == RADIUS_ACCT) {
833 handlers = radius->acct_handlers;
834 num_handlers = radius->num_acct_handlers;
835 rconf = conf->acct_server;
836 } else {
837 handlers = radius->auth_handlers;
838 num_handlers = radius->num_auth_handlers;
839 rconf = conf->auth_server;
840 }
841
842 iov.iov_base = buf;
843 iov.iov_len = RADIUS_MAX_MSG_LEN;
844 msghdr.msg_iov = &iov;
845 msghdr.msg_iovlen = 1;
846 msghdr.msg_flags = 0;
847 len = recvmsg(sock, &msghdr, MSG_DONTWAIT);
848 if (len < 0) {
849 wpa_printf(MSG_INFO, "recvmsg[RADIUS]: %s", strerror(errno));
850 return;
851 }
852
853 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
854 HOSTAPD_LEVEL_DEBUG, "Received %d bytes from RADIUS "
855 "server", len);
856
857 if (msghdr.msg_flags & MSG_TRUNC) {
858 wpa_printf(MSG_INFO, "RADIUS: Possibly too long UDP frame for our buffer - dropping it");
859 return;
860 }
861
862 msg = radius_msg_parse(buf, len);
863 if (msg == NULL) {
864 wpa_printf(MSG_INFO, "RADIUS: Parsing incoming frame failed");
865 rconf->malformed_responses++;
866 return;
867 }
868 hdr = radius_msg_get_hdr(msg);
869
870 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
871 HOSTAPD_LEVEL_DEBUG, "Received RADIUS message");
872 if (conf->msg_dumps)
873 radius_msg_dump(msg);
874
875 switch (hdr->code) {
876 case RADIUS_CODE_ACCESS_ACCEPT:
877 rconf->access_accepts++;
878 break;
879 case RADIUS_CODE_ACCESS_REJECT:
880 rconf->access_rejects++;
881 break;
882 case RADIUS_CODE_ACCESS_CHALLENGE:
883 rconf->access_challenges++;
884 break;
885 case RADIUS_CODE_ACCOUNTING_RESPONSE:
886 rconf->responses++;
887 break;
888 }
889
890 prev_req = NULL;
891 req = radius->msgs;
892 while (req) {
893 /* TODO: also match by src addr:port of the packet when using
894 * alternative RADIUS servers (?) */
895 if ((req->msg_type == msg_type ||
896 (req->msg_type == RADIUS_ACCT_INTERIM &&
897 msg_type == RADIUS_ACCT)) &&
898 radius_msg_get_hdr(req->msg)->identifier ==
899 hdr->identifier)
900 break;
901
902 prev_req = req;
903 req = req->next;
904 }
905
906 if (req == NULL) {
907 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
908 HOSTAPD_LEVEL_DEBUG,
909 "No matching RADIUS request found (type=%d "
910 "id=%d) - dropping packet",
911 msg_type, hdr->identifier);
912 goto fail;
913 }
914
915 os_get_reltime(&now);
916 roundtrip = (now.sec - req->last_attempt.sec) * 100 +
917 (now.usec - req->last_attempt.usec) / 10000;
918 hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
919 HOSTAPD_LEVEL_DEBUG,
920 "Received RADIUS packet matched with a pending "
921 "request, round trip time %d.%02d sec",
922 roundtrip / 100, roundtrip % 100);
923 rconf->round_trip_time = roundtrip;
924
925 /* Remove ACKed RADIUS packet from retransmit list */
926 if (prev_req)
927 prev_req->next = req->next;
928 else
929 radius->msgs = req->next;
930 radius->num_msgs--;
931
932 for (i = 0; i < num_handlers; i++) {
933 RadiusRxResult res;
934 res = handlers[i].handler(msg, req->msg, req->shared_secret,
935 req->shared_secret_len,
936 handlers[i].data);
937 switch (res) {
938 case RADIUS_RX_PROCESSED:
939 radius_msg_free(msg);
940 /* fall through */
941 case RADIUS_RX_QUEUED:
942 radius_client_msg_free(req);
943 return;
944 case RADIUS_RX_INVALID_AUTHENTICATOR:
945 invalid_authenticator++;
946 /* fall through */
947 case RADIUS_RX_UNKNOWN:
948 /* continue with next handler */
949 break;
950 }
951 }
952
953 if (invalid_authenticator)
954 rconf->bad_authenticators++;
955 else
956 rconf->unknown_types++;
957 hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
958 HOSTAPD_LEVEL_DEBUG, "No RADIUS RX handler found "
959 "(type=%d code=%d id=%d)%s - dropping packet",
960 msg_type, hdr->code, hdr->identifier,
961 invalid_authenticator ? " [INVALID AUTHENTICATOR]" :
962 "");
963 radius_client_msg_free(req);
964
965 fail:
966 radius_msg_free(msg);
967 }
968
969
970 /**
971 * radius_client_get_id - Get an identifier for a new RADIUS message
972 * @radius: RADIUS client context from radius_client_init()
973 * Returns: Allocated identifier
974 *
975 * This function is used to fetch a unique (among pending requests) identifier
976 * for a new RADIUS message.
977 */
radius_client_get_id(struct radius_client_data * radius)978 u8 radius_client_get_id(struct radius_client_data *radius)
979 {
980 struct radius_msg_list *entry, *prev, *_remove;
981 u8 id = radius->next_radius_identifier++;
982
983 /* remove entries with matching id from retransmit list to avoid
984 * using new reply from the RADIUS server with an old request */
985 entry = radius->msgs;
986 prev = NULL;
987 while (entry) {
988 if (radius_msg_get_hdr(entry->msg)->identifier == id) {
989 hostapd_logger(radius->ctx, entry->addr,
990 HOSTAPD_MODULE_RADIUS,
991 HOSTAPD_LEVEL_DEBUG,
992 "Removing pending RADIUS message, "
993 "since its id (%d) is reused", id);
994 if (prev)
995 prev->next = entry->next;
996 else
997 radius->msgs = entry->next;
998 _remove = entry;
999 } else {
1000 _remove = NULL;
1001 prev = entry;
1002 }
1003 entry = entry->next;
1004
1005 if (_remove)
1006 radius_client_msg_free(_remove);
1007 }
1008
1009 return id;
1010 }
1011
1012
1013 /**
1014 * radius_client_flush - Flush all pending RADIUS client messages
1015 * @radius: RADIUS client context from radius_client_init()
1016 * @only_auth: Whether only authentication messages are removed
1017 */
radius_client_flush(struct radius_client_data * radius,int only_auth)1018 void radius_client_flush(struct radius_client_data *radius, int only_auth)
1019 {
1020 struct radius_msg_list *entry, *prev, *tmp;
1021
1022 if (!radius)
1023 return;
1024
1025 prev = NULL;
1026 entry = radius->msgs;
1027
1028 while (entry) {
1029 if (!only_auth || entry->msg_type == RADIUS_AUTH) {
1030 if (prev)
1031 prev->next = entry->next;
1032 else
1033 radius->msgs = entry->next;
1034
1035 tmp = entry;
1036 entry = entry->next;
1037 radius_client_msg_free(tmp);
1038 radius->num_msgs--;
1039 } else {
1040 prev = entry;
1041 entry = entry->next;
1042 }
1043 }
1044
1045 if (radius->msgs == NULL)
1046 eloop_cancel_timeout(radius_client_timer, radius, NULL);
1047 }
1048
1049
radius_client_update_acct_msgs(struct radius_client_data * radius,const u8 * shared_secret,size_t shared_secret_len)1050 static void radius_client_update_acct_msgs(struct radius_client_data *radius,
1051 const u8 *shared_secret,
1052 size_t shared_secret_len)
1053 {
1054 struct radius_msg_list *entry;
1055
1056 if (!radius)
1057 return;
1058
1059 for (entry = radius->msgs; entry; entry = entry->next) {
1060 if (entry->msg_type == RADIUS_ACCT) {
1061 entry->shared_secret = shared_secret;
1062 entry->shared_secret_len = shared_secret_len;
1063 radius_msg_finish_acct(entry->msg, shared_secret,
1064 shared_secret_len);
1065 }
1066 }
1067 }
1068
1069
1070 static int
radius_change_server(struct radius_client_data * radius,struct hostapd_radius_server * nserv,struct hostapd_radius_server * oserv,int sock,int sock6,int auth)1071 radius_change_server(struct radius_client_data *radius,
1072 struct hostapd_radius_server *nserv,
1073 struct hostapd_radius_server *oserv,
1074 int sock, int sock6, int auth)
1075 {
1076 struct sockaddr_in serv, claddr;
1077 #ifdef CONFIG_IPV6
1078 struct sockaddr_in6 serv6, claddr6;
1079 #endif /* CONFIG_IPV6 */
1080 struct sockaddr *addr, *cl_addr;
1081 socklen_t addrlen, claddrlen;
1082 char abuf[50];
1083 int sel_sock;
1084 struct radius_msg_list *entry;
1085 struct hostapd_radius_servers *conf = radius->conf;
1086 struct sockaddr_in disconnect_addr = {
1087 .sin_family = AF_UNSPEC,
1088 };
1089
1090 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
1091 HOSTAPD_LEVEL_INFO,
1092 "%s server %s:%d",
1093 auth ? "Authentication" : "Accounting",
1094 hostapd_ip_txt(&nserv->addr, abuf, sizeof(abuf)),
1095 nserv->port);
1096
1097 if (oserv && oserv == nserv) {
1098 /* Reconnect to same server, flush */
1099 if (auth)
1100 radius_client_flush(radius, 1);
1101 }
1102
1103 if (oserv && oserv != nserv &&
1104 (nserv->shared_secret_len != oserv->shared_secret_len ||
1105 os_memcmp(nserv->shared_secret, oserv->shared_secret,
1106 nserv->shared_secret_len) != 0)) {
1107 /* Pending RADIUS packets used different shared secret, so
1108 * they need to be modified. Update accounting message
1109 * authenticators here. Authentication messages are removed
1110 * since they would require more changes and the new RADIUS
1111 * server may not be prepared to receive them anyway due to
1112 * missing state information. Client will likely retry
1113 * authentication, so this should not be an issue. */
1114 if (auth)
1115 radius_client_flush(radius, 1);
1116 else {
1117 radius_client_update_acct_msgs(
1118 radius, nserv->shared_secret,
1119 nserv->shared_secret_len);
1120 }
1121 }
1122
1123 /* Reset retry counters */
1124 for (entry = radius->msgs; oserv && entry; entry = entry->next) {
1125 if ((auth && entry->msg_type != RADIUS_AUTH) ||
1126 (!auth && entry->msg_type != RADIUS_ACCT))
1127 continue;
1128 entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
1129 entry->attempts = 0;
1130 entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
1131 }
1132
1133 if (radius->msgs) {
1134 eloop_cancel_timeout(radius_client_timer, radius, NULL);
1135 eloop_register_timeout(RADIUS_CLIENT_FIRST_WAIT, 0,
1136 radius_client_timer, radius, NULL);
1137 }
1138
1139 switch (nserv->addr.af) {
1140 case AF_INET:
1141 os_memset(&serv, 0, sizeof(serv));
1142 serv.sin_family = AF_INET;
1143 serv.sin_addr.s_addr = nserv->addr.u.v4.s_addr;
1144 serv.sin_port = htons(nserv->port);
1145 addr = (struct sockaddr *) &serv;
1146 addrlen = sizeof(serv);
1147 sel_sock = sock;
1148 break;
1149 #ifdef CONFIG_IPV6
1150 case AF_INET6:
1151 os_memset(&serv6, 0, sizeof(serv6));
1152 serv6.sin6_family = AF_INET6;
1153 os_memcpy(&serv6.sin6_addr, &nserv->addr.u.v6,
1154 sizeof(struct in6_addr));
1155 serv6.sin6_port = htons(nserv->port);
1156 addr = (struct sockaddr *) &serv6;
1157 addrlen = sizeof(serv6);
1158 sel_sock = sock6;
1159 break;
1160 #endif /* CONFIG_IPV6 */
1161 default:
1162 return -1;
1163 }
1164
1165 if (sel_sock < 0) {
1166 wpa_printf(MSG_INFO,
1167 "RADIUS: No server socket available (af=%d sock=%d sock6=%d auth=%d",
1168 nserv->addr.af, sock, sock6, auth);
1169 return -1;
1170 }
1171
1172 /* Force a reconnect by disconnecting the socket first */
1173 if (connect(sel_sock, (struct sockaddr *) &disconnect_addr,
1174 sizeof(disconnect_addr)) < 0)
1175 wpa_printf(MSG_INFO, "disconnect[radius]: %s", strerror(errno));
1176
1177 #ifdef __linux__
1178 if (conf->force_client_dev && conf->force_client_dev[0]) {
1179 if (setsockopt(sel_sock, SOL_SOCKET, SO_BINDTODEVICE,
1180 conf->force_client_dev,
1181 os_strlen(conf->force_client_dev)) < 0) {
1182 wpa_printf(MSG_ERROR,
1183 "RADIUS: setsockopt[SO_BINDTODEVICE]: %s",
1184 strerror(errno));
1185 /* Probably not a critical error; continue on and hope
1186 * for the best. */
1187 } else {
1188 wpa_printf(MSG_DEBUG,
1189 "RADIUS: Bound client socket to device: %s",
1190 conf->force_client_dev);
1191 }
1192 }
1193 #endif /* __linux__ */
1194
1195 if (conf->force_client_addr) {
1196 switch (conf->client_addr.af) {
1197 case AF_INET:
1198 os_memset(&claddr, 0, sizeof(claddr));
1199 claddr.sin_family = AF_INET;
1200 claddr.sin_addr.s_addr = conf->client_addr.u.v4.s_addr;
1201 claddr.sin_port = htons(0);
1202 cl_addr = (struct sockaddr *) &claddr;
1203 claddrlen = sizeof(claddr);
1204 break;
1205 #ifdef CONFIG_IPV6
1206 case AF_INET6:
1207 os_memset(&claddr6, 0, sizeof(claddr6));
1208 claddr6.sin6_family = AF_INET6;
1209 os_memcpy(&claddr6.sin6_addr, &conf->client_addr.u.v6,
1210 sizeof(struct in6_addr));
1211 claddr6.sin6_port = htons(0);
1212 cl_addr = (struct sockaddr *) &claddr6;
1213 claddrlen = sizeof(claddr6);
1214 break;
1215 #endif /* CONFIG_IPV6 */
1216 default:
1217 return -1;
1218 }
1219
1220 if (bind(sel_sock, cl_addr, claddrlen) < 0) {
1221 wpa_printf(MSG_INFO, "bind[radius]: %s",
1222 strerror(errno));
1223 return -1;
1224 }
1225 }
1226
1227 if (connect(sel_sock, addr, addrlen) < 0) {
1228 wpa_printf(MSG_INFO, "connect[radius]: %s", strerror(errno));
1229 return -1;
1230 }
1231
1232 #ifndef CONFIG_NATIVE_WINDOWS
1233 switch (nserv->addr.af) {
1234 case AF_INET:
1235 claddrlen = sizeof(claddr);
1236 if (getsockname(sel_sock, (struct sockaddr *) &claddr,
1237 &claddrlen) == 0) {
1238 wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1239 inet_ntoa(claddr.sin_addr),
1240 ntohs(claddr.sin_port));
1241 }
1242 break;
1243 #ifdef CONFIG_IPV6
1244 case AF_INET6: {
1245 claddrlen = sizeof(claddr6);
1246 if (getsockname(sel_sock, (struct sockaddr *) &claddr6,
1247 &claddrlen) == 0) {
1248 wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1249 inet_ntop(AF_INET6, &claddr6.sin6_addr,
1250 abuf, sizeof(abuf)),
1251 ntohs(claddr6.sin6_port));
1252 }
1253 break;
1254 }
1255 #endif /* CONFIG_IPV6 */
1256 }
1257 #endif /* CONFIG_NATIVE_WINDOWS */
1258
1259 if (auth)
1260 radius->auth_sock = sel_sock;
1261 else
1262 radius->acct_sock = sel_sock;
1263
1264 return 0;
1265 }
1266
1267
radius_retry_primary_timer(void * eloop_ctx,void * timeout_ctx)1268 static void radius_retry_primary_timer(void *eloop_ctx, void *timeout_ctx)
1269 {
1270 struct radius_client_data *radius = eloop_ctx;
1271 struct hostapd_radius_servers *conf = radius->conf;
1272 struct hostapd_radius_server *oserv;
1273
1274 if (radius->auth_sock >= 0 && conf->auth_servers &&
1275 conf->auth_server != conf->auth_servers) {
1276 oserv = conf->auth_server;
1277 conf->auth_server = conf->auth_servers;
1278 if (radius_change_server(radius, conf->auth_server, oserv,
1279 radius->auth_serv_sock,
1280 radius->auth_serv_sock6, 1) < 0) {
1281 conf->auth_server = oserv;
1282 radius_change_server(radius, oserv, conf->auth_server,
1283 radius->auth_serv_sock,
1284 radius->auth_serv_sock6, 1);
1285 }
1286 }
1287
1288 if (radius->acct_sock >= 0 && conf->acct_servers &&
1289 conf->acct_server != conf->acct_servers) {
1290 oserv = conf->acct_server;
1291 conf->acct_server = conf->acct_servers;
1292 if (radius_change_server(radius, conf->acct_server, oserv,
1293 radius->acct_serv_sock,
1294 radius->acct_serv_sock6, 0) < 0) {
1295 conf->acct_server = oserv;
1296 radius_change_server(radius, oserv, conf->acct_server,
1297 radius->acct_serv_sock,
1298 radius->acct_serv_sock6, 0);
1299 }
1300 }
1301
1302 if (conf->retry_primary_interval)
1303 eloop_register_timeout(conf->retry_primary_interval, 0,
1304 radius_retry_primary_timer, radius,
1305 NULL);
1306 }
1307
1308
radius_client_disable_pmtu_discovery(int s)1309 static int radius_client_disable_pmtu_discovery(int s)
1310 {
1311 int r = -1;
1312 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
1313 /* Turn off Path MTU discovery on IPv4/UDP sockets. */
1314 int action = IP_PMTUDISC_DONT;
1315 r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action,
1316 sizeof(action));
1317 if (r == -1)
1318 wpa_printf(MSG_ERROR, "RADIUS: Failed to set IP_MTU_DISCOVER: %s",
1319 strerror(errno));
1320 #endif
1321 return r;
1322 }
1323
1324
radius_close_auth_sockets(struct radius_client_data * radius)1325 static void radius_close_auth_sockets(struct radius_client_data *radius)
1326 {
1327 radius->auth_sock = -1;
1328
1329 if (radius->auth_serv_sock >= 0) {
1330 eloop_unregister_read_sock(radius->auth_serv_sock);
1331 close(radius->auth_serv_sock);
1332 radius->auth_serv_sock = -1;
1333 }
1334 #ifdef CONFIG_IPV6
1335 if (radius->auth_serv_sock6 >= 0) {
1336 eloop_unregister_read_sock(radius->auth_serv_sock6);
1337 close(radius->auth_serv_sock6);
1338 radius->auth_serv_sock6 = -1;
1339 }
1340 #endif /* CONFIG_IPV6 */
1341 }
1342
1343
radius_close_acct_sockets(struct radius_client_data * radius)1344 static void radius_close_acct_sockets(struct radius_client_data *radius)
1345 {
1346 radius->acct_sock = -1;
1347
1348 if (radius->acct_serv_sock >= 0) {
1349 eloop_unregister_read_sock(radius->acct_serv_sock);
1350 close(radius->acct_serv_sock);
1351 radius->acct_serv_sock = -1;
1352 }
1353 #ifdef CONFIG_IPV6
1354 if (radius->acct_serv_sock6 >= 0) {
1355 eloop_unregister_read_sock(radius->acct_serv_sock6);
1356 close(radius->acct_serv_sock6);
1357 radius->acct_serv_sock6 = -1;
1358 }
1359 #endif /* CONFIG_IPV6 */
1360 }
1361
1362
radius_client_init_auth(struct radius_client_data * radius)1363 static int radius_client_init_auth(struct radius_client_data *radius)
1364 {
1365 struct hostapd_radius_servers *conf = radius->conf;
1366 int ok = 0;
1367
1368 radius_close_auth_sockets(radius);
1369
1370 radius->auth_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1371 if (radius->auth_serv_sock < 0)
1372 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET,SOCK_DGRAM]: %s",
1373 strerror(errno));
1374 else {
1375 radius_client_disable_pmtu_discovery(radius->auth_serv_sock);
1376 ok++;
1377 }
1378
1379 #ifdef CONFIG_IPV6
1380 radius->auth_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1381 if (radius->auth_serv_sock6 < 0)
1382 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET6,SOCK_DGRAM]: %s",
1383 strerror(errno));
1384 else
1385 ok++;
1386 #endif /* CONFIG_IPV6 */
1387
1388 if (ok == 0)
1389 return -1;
1390
1391 radius_change_server(radius, conf->auth_server, NULL,
1392 radius->auth_serv_sock, radius->auth_serv_sock6,
1393 1);
1394
1395 if (radius->auth_serv_sock >= 0 &&
1396 eloop_register_read_sock(radius->auth_serv_sock,
1397 radius_client_receive, radius,
1398 (void *) RADIUS_AUTH)) {
1399 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for authentication server");
1400 radius_close_auth_sockets(radius);
1401 return -1;
1402 }
1403
1404 #ifdef CONFIG_IPV6
1405 if (radius->auth_serv_sock6 >= 0 &&
1406 eloop_register_read_sock(radius->auth_serv_sock6,
1407 radius_client_receive, radius,
1408 (void *) RADIUS_AUTH)) {
1409 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for authentication server");
1410 radius_close_auth_sockets(radius);
1411 return -1;
1412 }
1413 #endif /* CONFIG_IPV6 */
1414
1415 return 0;
1416 }
1417
1418
radius_client_init_acct(struct radius_client_data * radius)1419 static int radius_client_init_acct(struct radius_client_data *radius)
1420 {
1421 struct hostapd_radius_servers *conf = radius->conf;
1422 int ok = 0;
1423
1424 radius_close_acct_sockets(radius);
1425
1426 radius->acct_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1427 if (radius->acct_serv_sock < 0)
1428 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET,SOCK_DGRAM]: %s",
1429 strerror(errno));
1430 else {
1431 radius_client_disable_pmtu_discovery(radius->acct_serv_sock);
1432 ok++;
1433 }
1434
1435 #ifdef CONFIG_IPV6
1436 radius->acct_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1437 if (radius->acct_serv_sock6 < 0)
1438 wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET6,SOCK_DGRAM]: %s",
1439 strerror(errno));
1440 else
1441 ok++;
1442 #endif /* CONFIG_IPV6 */
1443
1444 if (ok == 0)
1445 return -1;
1446
1447 radius_change_server(radius, conf->acct_server, NULL,
1448 radius->acct_serv_sock, radius->acct_serv_sock6,
1449 0);
1450
1451 if (radius->acct_serv_sock >= 0 &&
1452 eloop_register_read_sock(radius->acct_serv_sock,
1453 radius_client_receive, radius,
1454 (void *) RADIUS_ACCT)) {
1455 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for accounting server");
1456 radius_close_acct_sockets(radius);
1457 return -1;
1458 }
1459
1460 #ifdef CONFIG_IPV6
1461 if (radius->acct_serv_sock6 >= 0 &&
1462 eloop_register_read_sock(radius->acct_serv_sock6,
1463 radius_client_receive, radius,
1464 (void *) RADIUS_ACCT)) {
1465 wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for accounting server");
1466 radius_close_acct_sockets(radius);
1467 return -1;
1468 }
1469 #endif /* CONFIG_IPV6 */
1470
1471 return 0;
1472 }
1473
1474
1475 /**
1476 * radius_client_init - Initialize RADIUS client
1477 * @ctx: Callback context to be used in hostapd_logger() calls
1478 * @conf: RADIUS client configuration (RADIUS servers)
1479 * Returns: Pointer to private RADIUS client context or %NULL on failure
1480 *
1481 * The caller is responsible for keeping the configuration data available for
1482 * the lifetime of the RADIUS client, i.e., until radius_client_deinit() is
1483 * called for the returned context pointer.
1484 */
1485 struct radius_client_data *
radius_client_init(void * ctx,struct hostapd_radius_servers * conf)1486 radius_client_init(void *ctx, struct hostapd_radius_servers *conf)
1487 {
1488 struct radius_client_data *radius;
1489
1490 radius = os_zalloc(sizeof(struct radius_client_data));
1491 if (radius == NULL)
1492 return NULL;
1493
1494 radius->ctx = ctx;
1495 radius->conf = conf;
1496 radius->auth_serv_sock = radius->acct_serv_sock =
1497 radius->auth_serv_sock6 = radius->acct_serv_sock6 =
1498 radius->auth_sock = radius->acct_sock = -1;
1499
1500 if (conf->auth_server && radius_client_init_auth(radius)) {
1501 radius_client_deinit(radius);
1502 return NULL;
1503 }
1504
1505 if (conf->acct_server && radius_client_init_acct(radius)) {
1506 radius_client_deinit(radius);
1507 return NULL;
1508 }
1509
1510 if (conf->retry_primary_interval)
1511 eloop_register_timeout(conf->retry_primary_interval, 0,
1512 radius_retry_primary_timer, radius,
1513 NULL);
1514
1515 return radius;
1516 }
1517
1518
1519 /**
1520 * radius_client_deinit - Deinitialize RADIUS client
1521 * @radius: RADIUS client context from radius_client_init()
1522 */
radius_client_deinit(struct radius_client_data * radius)1523 void radius_client_deinit(struct radius_client_data *radius)
1524 {
1525 if (!radius)
1526 return;
1527
1528 radius_close_auth_sockets(radius);
1529 radius_close_acct_sockets(radius);
1530
1531 eloop_cancel_timeout(radius_retry_primary_timer, radius, NULL);
1532
1533 radius_client_flush(radius, 0);
1534 os_free(radius->auth_handlers);
1535 os_free(radius->acct_handlers);
1536 os_free(radius);
1537 }
1538
1539
1540 /**
1541 * radius_client_flush_auth - Flush pending RADIUS messages for an address
1542 * @radius: RADIUS client context from radius_client_init()
1543 * @addr: MAC address of the related device
1544 *
1545 * This function can be used to remove pending RADIUS authentication messages
1546 * that are related to a specific device. The addr parameter is matched with
1547 * the one used in radius_client_send() call that was used to transmit the
1548 * authentication request.
1549 */
radius_client_flush_auth(struct radius_client_data * radius,const u8 * addr)1550 void radius_client_flush_auth(struct radius_client_data *radius,
1551 const u8 *addr)
1552 {
1553 struct radius_msg_list *entry, *prev, *tmp;
1554
1555 prev = NULL;
1556 entry = radius->msgs;
1557 while (entry) {
1558 if (entry->msg_type == RADIUS_AUTH &&
1559 os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
1560 hostapd_logger(radius->ctx, addr,
1561 HOSTAPD_MODULE_RADIUS,
1562 HOSTAPD_LEVEL_DEBUG,
1563 "Removing pending RADIUS authentication"
1564 " message for removed client");
1565
1566 if (prev)
1567 prev->next = entry->next;
1568 else
1569 radius->msgs = entry->next;
1570
1571 tmp = entry;
1572 entry = entry->next;
1573 radius_client_msg_free(tmp);
1574 radius->num_msgs--;
1575 continue;
1576 }
1577
1578 prev = entry;
1579 entry = entry->next;
1580 }
1581 }
1582
1583
radius_client_dump_auth_server(char * buf,size_t buflen,struct hostapd_radius_server * serv,struct radius_client_data * cli)1584 static int radius_client_dump_auth_server(char *buf, size_t buflen,
1585 struct hostapd_radius_server *serv,
1586 struct radius_client_data *cli)
1587 {
1588 int pending = 0;
1589 struct radius_msg_list *msg;
1590 char abuf[50];
1591
1592 if (cli) {
1593 for (msg = cli->msgs; msg; msg = msg->next) {
1594 if (msg->msg_type == RADIUS_AUTH)
1595 pending++;
1596 }
1597 }
1598
1599 return os_snprintf(buf, buflen,
1600 "radiusAuthServerIndex=%d\n"
1601 "radiusAuthServerAddress=%s\n"
1602 "radiusAuthClientServerPortNumber=%d\n"
1603 "radiusAuthClientRoundTripTime=%d\n"
1604 "radiusAuthClientAccessRequests=%u\n"
1605 "radiusAuthClientAccessRetransmissions=%u\n"
1606 "radiusAuthClientAccessAccepts=%u\n"
1607 "radiusAuthClientAccessRejects=%u\n"
1608 "radiusAuthClientAccessChallenges=%u\n"
1609 "radiusAuthClientMalformedAccessResponses=%u\n"
1610 "radiusAuthClientBadAuthenticators=%u\n"
1611 "radiusAuthClientPendingRequests=%u\n"
1612 "radiusAuthClientTimeouts=%u\n"
1613 "radiusAuthClientUnknownTypes=%u\n"
1614 "radiusAuthClientPacketsDropped=%u\n",
1615 serv->index,
1616 hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1617 serv->port,
1618 serv->round_trip_time,
1619 serv->requests,
1620 serv->retransmissions,
1621 serv->access_accepts,
1622 serv->access_rejects,
1623 serv->access_challenges,
1624 serv->malformed_responses,
1625 serv->bad_authenticators,
1626 pending,
1627 serv->timeouts,
1628 serv->unknown_types,
1629 serv->packets_dropped);
1630 }
1631
1632
radius_client_dump_acct_server(char * buf,size_t buflen,struct hostapd_radius_server * serv,struct radius_client_data * cli)1633 static int radius_client_dump_acct_server(char *buf, size_t buflen,
1634 struct hostapd_radius_server *serv,
1635 struct radius_client_data *cli)
1636 {
1637 int pending = 0;
1638 struct radius_msg_list *msg;
1639 char abuf[50];
1640
1641 if (cli) {
1642 for (msg = cli->msgs; msg; msg = msg->next) {
1643 if (msg->msg_type == RADIUS_ACCT ||
1644 msg->msg_type == RADIUS_ACCT_INTERIM)
1645 pending++;
1646 }
1647 }
1648
1649 return os_snprintf(buf, buflen,
1650 "radiusAccServerIndex=%d\n"
1651 "radiusAccServerAddress=%s\n"
1652 "radiusAccClientServerPortNumber=%d\n"
1653 "radiusAccClientRoundTripTime=%d\n"
1654 "radiusAccClientRequests=%u\n"
1655 "radiusAccClientRetransmissions=%u\n"
1656 "radiusAccClientResponses=%u\n"
1657 "radiusAccClientMalformedResponses=%u\n"
1658 "radiusAccClientBadAuthenticators=%u\n"
1659 "radiusAccClientPendingRequests=%u\n"
1660 "radiusAccClientTimeouts=%u\n"
1661 "radiusAccClientUnknownTypes=%u\n"
1662 "radiusAccClientPacketsDropped=%u\n",
1663 serv->index,
1664 hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1665 serv->port,
1666 serv->round_trip_time,
1667 serv->requests,
1668 serv->retransmissions,
1669 serv->responses,
1670 serv->malformed_responses,
1671 serv->bad_authenticators,
1672 pending,
1673 serv->timeouts,
1674 serv->unknown_types,
1675 serv->packets_dropped);
1676 }
1677
1678
1679 /**
1680 * radius_client_get_mib - Get RADIUS client MIB information
1681 * @radius: RADIUS client context from radius_client_init()
1682 * @buf: Buffer for returning MIB data in text format
1683 * @buflen: Maximum buf length in octets
1684 * Returns: Number of octets written into the buffer
1685 */
radius_client_get_mib(struct radius_client_data * radius,char * buf,size_t buflen)1686 int radius_client_get_mib(struct radius_client_data *radius, char *buf,
1687 size_t buflen)
1688 {
1689 struct hostapd_radius_servers *conf;
1690 int i;
1691 struct hostapd_radius_server *serv;
1692 int count = 0;
1693
1694 if (!radius)
1695 return 0;
1696
1697 conf = radius->conf;
1698
1699 if (conf->auth_servers) {
1700 for (i = 0; i < conf->num_auth_servers; i++) {
1701 serv = &conf->auth_servers[i];
1702 count += radius_client_dump_auth_server(
1703 buf + count, buflen - count, serv,
1704 serv == conf->auth_server ?
1705 radius : NULL);
1706 }
1707 }
1708
1709 if (conf->acct_servers) {
1710 for (i = 0; i < conf->num_acct_servers; i++) {
1711 serv = &conf->acct_servers[i];
1712 count += radius_client_dump_acct_server(
1713 buf + count, buflen - count, serv,
1714 serv == conf->acct_server ?
1715 radius : NULL);
1716 }
1717 }
1718
1719 return count;
1720 }
1721
1722
radius_client_reconfig(struct radius_client_data * radius,struct hostapd_radius_servers * conf)1723 void radius_client_reconfig(struct radius_client_data *radius,
1724 struct hostapd_radius_servers *conf)
1725 {
1726 if (radius)
1727 radius->conf = conf;
1728 }
1729
