Line data Source code
1 : /*
2 : * RADIUS client
3 : * Copyright (c) 2002-2009, 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 :
11 : #include "common.h"
12 : #include "radius.h"
13 : #include "radius_client.h"
14 : #include "eloop.h"
15 :
16 : /* Defaults for RADIUS retransmit values (exponential backoff) */
17 :
18 : /**
19 : * RADIUS_CLIENT_FIRST_WAIT - RADIUS client timeout for first retry in seconds
20 : */
21 : #define RADIUS_CLIENT_FIRST_WAIT 3
22 :
23 : /**
24 : * RADIUS_CLIENT_MAX_WAIT - RADIUS client maximum retry timeout in seconds
25 : */
26 : #define RADIUS_CLIENT_MAX_WAIT 120
27 :
28 : /**
29 : * RADIUS_CLIENT_MAX_RETRIES - RADIUS client maximum retries
30 : *
31 : * Maximum number of retransmit attempts before the entry is removed from
32 : * retransmit list.
33 : */
34 : #define RADIUS_CLIENT_MAX_RETRIES 10
35 :
36 : /**
37 : * RADIUS_CLIENT_MAX_ENTRIES - RADIUS client maximum pending messages
38 : *
39 : * Maximum number of entries in retransmit list (oldest entries will be
40 : * removed, if this limit is exceeded).
41 : */
42 : #define RADIUS_CLIENT_MAX_ENTRIES 30
43 :
44 : /**
45 : * RADIUS_CLIENT_NUM_FAILOVER - RADIUS client failover point
46 : *
47 : * The number of failed retry attempts after which the RADIUS server will be
48 : * changed (if one of more backup servers are configured).
49 : */
50 : #define RADIUS_CLIENT_NUM_FAILOVER 4
51 :
52 :
53 : /**
54 : * struct radius_rx_handler - RADIUS client RX handler
55 : *
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().
60 : */
61 : struct radius_rx_handler {
62 : /**
63 : * handler - Received RADIUS message handler
64 : */
65 : RadiusRxResult (*handler)(struct radius_msg *msg,
66 : struct radius_msg *req,
67 : const u8 *shared_secret,
68 : size_t shared_secret_len,
69 : void *data);
70 :
71 : /**
72 : * data - Context data for the handler
73 : */
74 : void *data;
75 : };
76 :
77 :
78 : /**
79 : * struct radius_msg_list - RADIUS client message retransmit list
80 : *
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.
83 : */
84 : struct radius_msg_list {
85 : /**
86 : * addr - STA/client address
87 : *
88 : * This is used to find RADIUS messages for the same STA.
89 : */
90 : u8 addr[ETH_ALEN];
91 :
92 : /**
93 : * msg - RADIUS message
94 : */
95 : struct radius_msg *msg;
96 :
97 : /**
98 : * msg_type - Message type
99 : */
100 : RadiusType msg_type;
101 :
102 : /**
103 : * first_try - Time of the first transmission attempt
104 : */
105 : os_time_t first_try;
106 :
107 : /**
108 : * next_try - Time for the next transmission attempt
109 : */
110 : os_time_t next_try;
111 :
112 : /**
113 : * attempts - Number of transmission attempts
114 : */
115 : int attempts;
116 :
117 : /**
118 : * next_wait - Next retransmission wait time in seconds
119 : */
120 : int next_wait;
121 :
122 : /**
123 : * last_attempt - Time of the last transmission attempt
124 : */
125 : struct os_reltime last_attempt;
126 :
127 : /**
128 : * shared_secret - Shared secret with the target RADIUS server
129 : */
130 : const u8 *shared_secret;
131 :
132 : /**
133 : * shared_secret_len - shared_secret length in octets
134 : */
135 : size_t shared_secret_len;
136 :
137 : /* TODO: server config with failover to backup server(s) */
138 :
139 : /**
140 : * next - Next message in the list
141 : */
142 : struct radius_msg_list *next;
143 : };
144 :
145 :
146 : /**
147 : * struct radius_client_data - Internal RADIUS client data
148 : *
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.
153 : */
154 : struct radius_client_data {
155 : /**
156 : * ctx - Context pointer for hostapd_logger() callbacks
157 : */
158 : void *ctx;
159 :
160 : /**
161 : * conf - RADIUS client configuration (list of RADIUS servers to use)
162 : */
163 : struct hostapd_radius_servers *conf;
164 :
165 : /**
166 : * auth_serv_sock - IPv4 socket for RADIUS authentication messages
167 : */
168 : int auth_serv_sock;
169 :
170 : /**
171 : * acct_serv_sock - IPv4 socket for RADIUS accounting messages
172 : */
173 : int acct_serv_sock;
174 :
175 : /**
176 : * auth_serv_sock6 - IPv6 socket for RADIUS authentication messages
177 : */
178 : int auth_serv_sock6;
179 :
180 : /**
181 : * acct_serv_sock6 - IPv6 socket for RADIUS accounting messages
182 : */
183 : int acct_serv_sock6;
184 :
185 : /**
186 : * auth_sock - Currently used socket for RADIUS authentication server
187 : */
188 : int auth_sock;
189 :
190 : /**
191 : * acct_sock - Currently used socket for RADIUS accounting server
192 : */
193 : int acct_sock;
194 :
195 : /**
196 : * auth_handlers - Authentication message handlers
197 : */
198 : struct radius_rx_handler *auth_handlers;
199 :
200 : /**
201 : * num_auth_handlers - Number of handlers in auth_handlers
202 : */
203 : size_t num_auth_handlers;
204 :
205 : /**
206 : * acct_handlers - Accounting message handlers
207 : */
208 : struct radius_rx_handler *acct_handlers;
209 :
210 : /**
211 : * num_acct_handlers - Number of handlers in acct_handlers
212 : */
213 : size_t num_acct_handlers;
214 :
215 : /**
216 : * msgs - Pending outgoing RADIUS messages
217 : */
218 : struct radius_msg_list *msgs;
219 :
220 : /**
221 : * num_msgs - Number of pending messages in the msgs list
222 : */
223 : size_t num_msgs;
224 :
225 : /**
226 : * next_radius_identifier - Next RADIUS message identifier to use
227 : */
228 : u8 next_radius_identifier;
229 : };
230 :
231 :
232 : static int
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);
239 :
240 :
241 1635 : static void radius_client_msg_free(struct radius_msg_list *req)
242 : {
243 1635 : radius_msg_free(req->msg);
244 1635 : os_free(req);
245 1635 : }
246 :
247 :
248 : /**
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
255 : *
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.
259 : *
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.
263 : */
264 1656 : int radius_client_register(struct radius_client_data *radius,
265 : RadiusType msg_type,
266 : RadiusRxResult (*handler)(struct radius_msg *msg,
267 : struct radius_msg *req,
268 : const u8 *shared_secret,
269 : size_t shared_secret_len,
270 : void *data),
271 : void *data)
272 : {
273 : struct radius_rx_handler **handlers, *newh;
274 : size_t *num;
275 :
276 1656 : if (msg_type == RADIUS_ACCT) {
277 552 : handlers = &radius->acct_handlers;
278 552 : num = &radius->num_acct_handlers;
279 : } else {
280 1104 : handlers = &radius->auth_handlers;
281 1104 : num = &radius->num_auth_handlers;
282 : }
283 :
284 1656 : newh = os_realloc_array(*handlers, *num + 1,
285 : sizeof(struct radius_rx_handler));
286 1656 : if (newh == NULL)
287 0 : return -1;
288 :
289 1656 : newh[*num].handler = handler;
290 1656 : newh[*num].data = data;
291 1656 : (*num)++;
292 1656 : *handlers = newh;
293 :
294 1656 : return 0;
295 : }
296 :
297 :
298 2 : static void radius_client_handle_send_error(struct radius_client_data *radius,
299 : int s, RadiusType msg_type)
300 : {
301 : #ifndef CONFIG_NATIVE_WINDOWS
302 2 : int _errno = errno;
303 2 : wpa_printf(MSG_INFO, "send[RADIUS]: %s", strerror(errno));
304 2 : if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL ||
305 : _errno == EBADF) {
306 1 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
307 : HOSTAPD_LEVEL_INFO,
308 : "Send failed - maybe interface status changed -"
309 : " try to connect again");
310 1 : eloop_unregister_read_sock(s);
311 1 : close(s);
312 1 : if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM)
313 1 : radius_client_init_acct(radius);
314 : else
315 0 : radius_client_init_auth(radius);
316 : }
317 : #endif /* CONFIG_NATIVE_WINDOWS */
318 2 : }
319 :
320 :
321 3 : static int radius_client_retransmit(struct radius_client_data *radius,
322 : struct radius_msg_list *entry,
323 : os_time_t now)
324 : {
325 3 : struct hostapd_radius_servers *conf = radius->conf;
326 : int s;
327 : struct wpabuf *buf;
328 :
329 4 : if (entry->msg_type == RADIUS_ACCT ||
330 1 : entry->msg_type == RADIUS_ACCT_INTERIM) {
331 2 : s = radius->acct_sock;
332 4 : if (entry->attempts == 0)
333 0 : conf->acct_server->requests++;
334 : else {
335 2 : conf->acct_server->timeouts++;
336 2 : conf->acct_server->retransmissions++;
337 : }
338 : } else {
339 1 : s = radius->auth_sock;
340 1 : if (entry->attempts == 0)
341 0 : conf->auth_server->requests++;
342 : else {
343 1 : conf->auth_server->timeouts++;
344 1 : conf->auth_server->retransmissions++;
345 : }
346 : }
347 :
348 : /* retransmit; remove entry if too many attempts */
349 3 : entry->attempts++;
350 3 : hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS,
351 : HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)",
352 3 : radius_msg_get_hdr(entry->msg)->identifier);
353 :
354 3 : os_get_reltime(&entry->last_attempt);
355 3 : buf = radius_msg_get_buf(entry->msg);
356 3 : if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0)
357 1 : radius_client_handle_send_error(radius, s, entry->msg_type);
358 :
359 3 : entry->next_try = now + entry->next_wait;
360 3 : entry->next_wait *= 2;
361 3 : if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
362 0 : entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
363 3 : if (entry->attempts >= RADIUS_CLIENT_MAX_RETRIES) {
364 0 : wpa_printf(MSG_INFO, "RADIUS: Removing un-ACKed message due to too many failed retransmit attempts");
365 0 : return 1;
366 : }
367 :
368 3 : return 0;
369 : }
370 :
371 :
372 9 : static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
373 : {
374 9 : struct radius_client_data *radius = eloop_ctx;
375 9 : struct hostapd_radius_servers *conf = radius->conf;
376 : struct os_reltime now;
377 : os_time_t first;
378 : struct radius_msg_list *entry, *prev, *tmp;
379 9 : int auth_failover = 0, acct_failover = 0;
380 : char abuf[50];
381 :
382 9 : entry = radius->msgs;
383 9 : if (!entry)
384 16 : return;
385 :
386 2 : os_get_reltime(&now);
387 2 : first = 0;
388 :
389 2 : prev = NULL;
390 7 : while (entry) {
391 6 : if (now.sec >= entry->next_try &&
392 3 : radius_client_retransmit(radius, entry, now.sec)) {
393 0 : if (prev)
394 0 : prev->next = entry->next;
395 : else
396 0 : radius->msgs = entry->next;
397 :
398 0 : tmp = entry;
399 0 : entry = entry->next;
400 0 : radius_client_msg_free(tmp);
401 0 : radius->num_msgs--;
402 0 : continue;
403 : }
404 :
405 3 : if (entry->attempts > RADIUS_CLIENT_NUM_FAILOVER) {
406 0 : if (entry->msg_type == RADIUS_ACCT ||
407 0 : entry->msg_type == RADIUS_ACCT_INTERIM)
408 0 : acct_failover++;
409 : else
410 0 : auth_failover++;
411 : }
412 :
413 3 : if (first == 0 || entry->next_try < first)
414 2 : first = entry->next_try;
415 :
416 3 : prev = entry;
417 3 : entry = entry->next;
418 : }
419 :
420 2 : if (radius->msgs) {
421 2 : if (first < now.sec)
422 0 : first = now.sec;
423 2 : eloop_register_timeout(first - now.sec, 0,
424 : radius_client_timer, radius, NULL);
425 2 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
426 : HOSTAPD_LEVEL_DEBUG, "Next RADIUS client "
427 : "retransmit in %ld seconds",
428 2 : (long int) (first - now.sec));
429 : }
430 :
431 2 : if (auth_failover && conf->num_auth_servers > 1) {
432 : struct hostapd_radius_server *next, *old;
433 0 : old = conf->auth_server;
434 0 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
435 : HOSTAPD_LEVEL_NOTICE,
436 : "No response from Authentication server "
437 : "%s:%d - failover",
438 0 : hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
439 : old->port);
440 :
441 0 : for (entry = radius->msgs; entry; entry = entry->next) {
442 0 : if (entry->msg_type == RADIUS_AUTH)
443 0 : old->timeouts++;
444 : }
445 :
446 0 : next = old + 1;
447 0 : if (next > &(conf->auth_servers[conf->num_auth_servers - 1]))
448 0 : next = conf->auth_servers;
449 0 : conf->auth_server = next;
450 0 : radius_change_server(radius, next, old,
451 : radius->auth_serv_sock,
452 : radius->auth_serv_sock6, 1);
453 : }
454 :
455 2 : if (acct_failover && conf->num_acct_servers > 1) {
456 : struct hostapd_radius_server *next, *old;
457 0 : old = conf->acct_server;
458 0 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
459 : HOSTAPD_LEVEL_NOTICE,
460 : "No response from Accounting server "
461 : "%s:%d - failover",
462 0 : hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
463 : old->port);
464 :
465 0 : for (entry = radius->msgs; entry; entry = entry->next) {
466 0 : if (entry->msg_type == RADIUS_ACCT ||
467 0 : entry->msg_type == RADIUS_ACCT_INTERIM)
468 0 : old->timeouts++;
469 : }
470 :
471 0 : next = old + 1;
472 0 : if (next > &conf->acct_servers[conf->num_acct_servers - 1])
473 0 : next = conf->acct_servers;
474 0 : conf->acct_server = next;
475 0 : radius_change_server(radius, next, old,
476 : radius->acct_serv_sock,
477 : radius->acct_serv_sock6, 0);
478 : }
479 : }
480 :
481 :
482 1635 : static void radius_client_update_timeout(struct radius_client_data *radius)
483 : {
484 : struct os_reltime now;
485 : os_time_t first;
486 : struct radius_msg_list *entry;
487 :
488 1635 : eloop_cancel_timeout(radius_client_timer, radius, NULL);
489 :
490 1635 : if (radius->msgs == NULL) {
491 1635 : return;
492 : }
493 :
494 1635 : first = 0;
495 3282 : for (entry = radius->msgs; entry; entry = entry->next) {
496 1647 : if (first == 0 || entry->next_try < first)
497 1635 : first = entry->next_try;
498 : }
499 :
500 1635 : os_get_reltime(&now);
501 1635 : if (first < now.sec)
502 0 : first = now.sec;
503 1635 : eloop_register_timeout(first - now.sec, 0, radius_client_timer, radius,
504 : NULL);
505 1635 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
506 : HOSTAPD_LEVEL_DEBUG, "Next RADIUS client retransmit in"
507 1635 : " %ld seconds", (long int) (first - now.sec));
508 : }
509 :
510 :
511 1635 : static void radius_client_list_add(struct radius_client_data *radius,
512 : struct radius_msg *msg,
513 : RadiusType msg_type,
514 : const u8 *shared_secret,
515 : size_t shared_secret_len, const u8 *addr)
516 : {
517 : struct radius_msg_list *entry, *prev;
518 :
519 1635 : if (eloop_terminated()) {
520 : /* No point in adding entries to retransmit queue since event
521 : * loop has already been terminated. */
522 0 : radius_msg_free(msg);
523 0 : return;
524 : }
525 :
526 1635 : entry = os_zalloc(sizeof(*entry));
527 1635 : if (entry == NULL) {
528 0 : wpa_printf(MSG_INFO, "RADIUS: Failed to add packet into retransmit list");
529 0 : radius_msg_free(msg);
530 0 : return;
531 : }
532 :
533 1635 : if (addr)
534 1624 : os_memcpy(entry->addr, addr, ETH_ALEN);
535 1635 : entry->msg = msg;
536 1635 : entry->msg_type = msg_type;
537 1635 : entry->shared_secret = shared_secret;
538 1635 : entry->shared_secret_len = shared_secret_len;
539 1635 : os_get_reltime(&entry->last_attempt);
540 1635 : entry->first_try = entry->last_attempt.sec;
541 1635 : entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
542 1635 : entry->attempts = 1;
543 1635 : entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
544 1635 : entry->next = radius->msgs;
545 1635 : radius->msgs = entry;
546 1635 : radius_client_update_timeout(radius);
547 :
548 1635 : if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) {
549 0 : wpa_printf(MSG_INFO, "RADIUS: Removing the oldest un-ACKed packet due to retransmit list limits");
550 0 : prev = NULL;
551 0 : while (entry->next) {
552 0 : prev = entry;
553 0 : entry = entry->next;
554 : }
555 0 : if (prev) {
556 0 : prev->next = NULL;
557 0 : radius_client_msg_free(entry);
558 : }
559 : } else
560 1635 : radius->num_msgs++;
561 : }
562 :
563 :
564 3 : static void radius_client_list_del(struct radius_client_data *radius,
565 : RadiusType msg_type, const u8 *addr)
566 : {
567 : struct radius_msg_list *entry, *prev, *tmp;
568 :
569 3 : if (addr == NULL)
570 3 : return;
571 :
572 3 : entry = radius->msgs;
573 3 : prev = NULL;
574 6 : while (entry) {
575 0 : if (entry->msg_type == msg_type &&
576 0 : os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
577 0 : if (prev)
578 0 : prev->next = entry->next;
579 : else
580 0 : radius->msgs = entry->next;
581 0 : tmp = entry;
582 0 : entry = entry->next;
583 0 : hostapd_logger(radius->ctx, addr,
584 : HOSTAPD_MODULE_RADIUS,
585 : HOSTAPD_LEVEL_DEBUG,
586 : "Removing matching RADIUS message");
587 0 : radius_client_msg_free(tmp);
588 0 : radius->num_msgs--;
589 0 : continue;
590 : }
591 0 : prev = entry;
592 0 : entry = entry->next;
593 : }
594 : }
595 :
596 :
597 : /**
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
604 : *
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.
610 : *
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.
614 : *
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
617 : * updates.
618 : */
619 1635 : int radius_client_send(struct radius_client_data *radius,
620 : struct radius_msg *msg, RadiusType msg_type,
621 : const u8 *addr)
622 : {
623 1635 : struct hostapd_radius_servers *conf = radius->conf;
624 : const u8 *shared_secret;
625 : size_t shared_secret_len;
626 : char *name;
627 : int s, res;
628 : struct wpabuf *buf;
629 :
630 1635 : if (msg_type == RADIUS_ACCT_INTERIM) {
631 : /* Remove any pending interim acct update for the same STA. */
632 3 : radius_client_list_del(radius, msg_type, addr);
633 : }
634 :
635 1635 : if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) {
636 30 : if (conf->acct_server == NULL) {
637 0 : hostapd_logger(radius->ctx, NULL,
638 : HOSTAPD_MODULE_RADIUS,
639 : HOSTAPD_LEVEL_INFO,
640 : "No accounting server configured");
641 0 : return -1;
642 : }
643 30 : shared_secret = conf->acct_server->shared_secret;
644 30 : shared_secret_len = conf->acct_server->shared_secret_len;
645 30 : radius_msg_finish_acct(msg, shared_secret, shared_secret_len);
646 30 : name = "accounting";
647 30 : s = radius->acct_sock;
648 30 : conf->acct_server->requests++;
649 : } else {
650 1605 : if (conf->auth_server == NULL) {
651 0 : hostapd_logger(radius->ctx, NULL,
652 : HOSTAPD_MODULE_RADIUS,
653 : HOSTAPD_LEVEL_INFO,
654 : "No authentication server configured");
655 0 : return -1;
656 : }
657 1605 : shared_secret = conf->auth_server->shared_secret;
658 1605 : shared_secret_len = conf->auth_server->shared_secret_len;
659 1605 : radius_msg_finish(msg, shared_secret, shared_secret_len);
660 1605 : name = "authentication";
661 1605 : s = radius->auth_sock;
662 1605 : conf->auth_server->requests++;
663 : }
664 :
665 1635 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
666 : HOSTAPD_LEVEL_DEBUG, "Sending RADIUS message to %s "
667 : "server", name);
668 1635 : if (conf->msg_dumps)
669 1635 : radius_msg_dump(msg);
670 :
671 1635 : buf = radius_msg_get_buf(msg);
672 1635 : res = send(s, wpabuf_head(buf), wpabuf_len(buf), 0);
673 1635 : if (res < 0)
674 1 : radius_client_handle_send_error(radius, s, msg_type);
675 :
676 1635 : radius_client_list_add(radius, msg, msg_type, shared_secret,
677 : shared_secret_len, addr);
678 :
679 1635 : return 0;
680 : }
681 :
682 :
683 1629 : static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx)
684 : {
685 1629 : struct radius_client_data *radius = eloop_ctx;
686 1629 : struct hostapd_radius_servers *conf = radius->conf;
687 1629 : RadiusType msg_type = (RadiusType) sock_ctx;
688 : int len, roundtrip;
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 1629 : int invalid_authenticator = 0;
698 :
699 1629 : if (msg_type == RADIUS_ACCT) {
700 24 : handlers = radius->acct_handlers;
701 24 : num_handlers = radius->num_acct_handlers;
702 24 : rconf = conf->acct_server;
703 : } else {
704 1605 : handlers = radius->auth_handlers;
705 1605 : num_handlers = radius->num_auth_handlers;
706 1605 : rconf = conf->auth_server;
707 : }
708 :
709 1629 : len = recv(sock, buf, sizeof(buf), MSG_DONTWAIT);
710 1629 : if (len < 0) {
711 5 : wpa_printf(MSG_INFO, "recv[RADIUS]: %s", strerror(errno));
712 5 : return;
713 : }
714 1624 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
715 : HOSTAPD_LEVEL_DEBUG, "Received %d bytes from RADIUS "
716 : "server", len);
717 1624 : if (len == sizeof(buf)) {
718 0 : wpa_printf(MSG_INFO, "RADIUS: Possibly too long UDP frame for our buffer - dropping it");
719 0 : return;
720 : }
721 :
722 1624 : msg = radius_msg_parse(buf, len);
723 1624 : if (msg == NULL) {
724 0 : wpa_printf(MSG_INFO, "RADIUS: Parsing incoming frame failed");
725 0 : rconf->malformed_responses++;
726 0 : return;
727 : }
728 1624 : hdr = radius_msg_get_hdr(msg);
729 :
730 1624 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
731 : HOSTAPD_LEVEL_DEBUG, "Received RADIUS message");
732 1624 : if (conf->msg_dumps)
733 1624 : radius_msg_dump(msg);
734 :
735 1624 : switch (hdr->code) {
736 : case RADIUS_CODE_ACCESS_ACCEPT:
737 254 : rconf->access_accepts++;
738 254 : break;
739 : case RADIUS_CODE_ACCESS_REJECT:
740 48 : rconf->access_rejects++;
741 48 : break;
742 : case RADIUS_CODE_ACCESS_CHALLENGE:
743 1301 : rconf->access_challenges++;
744 1301 : break;
745 : case RADIUS_CODE_ACCOUNTING_RESPONSE:
746 21 : rconf->responses++;
747 21 : break;
748 : }
749 :
750 1624 : prev_req = NULL;
751 1624 : req = radius->msgs;
752 3251 : while (req) {
753 : /* TODO: also match by src addr:port of the packet when using
754 : * alternative RADIUS servers (?) */
755 1628 : if ((req->msg_type == msg_type ||
756 6 : (req->msg_type == RADIUS_ACCT_INTERIM &&
757 1625 : msg_type == RADIUS_ACCT)) &&
758 1625 : radius_msg_get_hdr(req->msg)->identifier ==
759 1625 : hdr->identifier)
760 1622 : break;
761 :
762 3 : prev_req = req;
763 3 : req = req->next;
764 : }
765 :
766 1624 : if (req == NULL) {
767 2 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
768 : HOSTAPD_LEVEL_DEBUG,
769 : "No matching RADIUS request found (type=%d "
770 : "id=%d) - dropping packet",
771 2 : msg_type, hdr->identifier);
772 2 : goto fail;
773 : }
774 :
775 1622 : os_get_reltime(&now);
776 3244 : roundtrip = (now.sec - req->last_attempt.sec) * 100 +
777 1622 : (now.usec - req->last_attempt.usec) / 10000;
778 1622 : hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
779 : HOSTAPD_LEVEL_DEBUG,
780 : "Received RADIUS packet matched with a pending "
781 : "request, round trip time %d.%02d sec",
782 : roundtrip / 100, roundtrip % 100);
783 1622 : rconf->round_trip_time = roundtrip;
784 :
785 : /* Remove ACKed RADIUS packet from retransmit list */
786 1622 : if (prev_req)
787 3 : prev_req->next = req->next;
788 : else
789 1619 : radius->msgs = req->next;
790 1622 : radius->num_msgs--;
791 :
792 3222 : for (i = 0; i < num_handlers; i++) {
793 : RadiusRxResult res;
794 6444 : res = handlers[i].handler(msg, req->msg, req->shared_secret,
795 : req->shared_secret_len,
796 3222 : handlers[i].data);
797 3222 : switch (res) {
798 : case RADIUS_RX_PROCESSED:
799 22 : radius_msg_free(msg);
800 : /* continue */
801 : case RADIUS_RX_QUEUED:
802 1622 : radius_client_msg_free(req);
803 1622 : return;
804 : case RADIUS_RX_INVALID_AUTHENTICATOR:
805 0 : invalid_authenticator++;
806 : /* continue */
807 : case RADIUS_RX_UNKNOWN:
808 : /* continue with next handler */
809 1600 : break;
810 : }
811 : }
812 :
813 0 : if (invalid_authenticator)
814 0 : rconf->bad_authenticators++;
815 : else
816 0 : rconf->unknown_types++;
817 0 : 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 0 : msg_type, hdr->code, hdr->identifier,
821 : invalid_authenticator ? " [INVALID AUTHENTICATOR]" :
822 : "");
823 0 : radius_client_msg_free(req);
824 :
825 : fail:
826 2 : radius_msg_free(msg);
827 : }
828 :
829 :
830 : /**
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
834 : *
835 : * This function is used to fetch a unique (among pending requests) identifier
836 : * for a new RADIUS message.
837 : */
838 1635 : u8 radius_client_get_id(struct radius_client_data *radius)
839 : {
840 : struct radius_msg_list *entry, *prev, *_remove;
841 1635 : u8 id = radius->next_radius_identifier++;
842 :
843 : /* remove entries with matching id from retransmit list to avoid
844 : * using new reply from the RADIUS server with an old request */
845 1635 : entry = radius->msgs;
846 1635 : prev = NULL;
847 3282 : while (entry) {
848 12 : if (radius_msg_get_hdr(entry->msg)->identifier == id) {
849 0 : hostapd_logger(radius->ctx, entry->addr,
850 : HOSTAPD_MODULE_RADIUS,
851 : HOSTAPD_LEVEL_DEBUG,
852 : "Removing pending RADIUS message, "
853 : "since its id (%d) is reused", id);
854 0 : if (prev)
855 0 : prev->next = entry->next;
856 : else
857 0 : radius->msgs = entry->next;
858 0 : _remove = entry;
859 : } else {
860 12 : _remove = NULL;
861 12 : prev = entry;
862 : }
863 12 : entry = entry->next;
864 :
865 12 : if (_remove)
866 0 : radius_client_msg_free(_remove);
867 : }
868 :
869 1635 : return id;
870 : }
871 :
872 :
873 : /**
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
877 : */
878 769 : void radius_client_flush(struct radius_client_data *radius, int only_auth)
879 : {
880 : struct radius_msg_list *entry, *prev, *tmp;
881 :
882 769 : if (!radius)
883 769 : return;
884 :
885 769 : prev = NULL;
886 769 : entry = radius->msgs;
887 :
888 1547 : while (entry) {
889 9 : if (!only_auth || entry->msg_type == RADIUS_AUTH) {
890 9 : if (prev)
891 0 : prev->next = entry->next;
892 : else
893 9 : radius->msgs = entry->next;
894 :
895 9 : tmp = entry;
896 9 : entry = entry->next;
897 9 : radius_client_msg_free(tmp);
898 9 : radius->num_msgs--;
899 : } else {
900 0 : prev = entry;
901 0 : entry = entry->next;
902 : }
903 : }
904 :
905 769 : if (radius->msgs == NULL)
906 769 : eloop_cancel_timeout(radius_client_timer, radius, NULL);
907 : }
908 :
909 :
910 6 : static void radius_client_update_acct_msgs(struct radius_client_data *radius,
911 : const u8 *shared_secret,
912 : size_t shared_secret_len)
913 : {
914 : struct radius_msg_list *entry;
915 :
916 6 : if (!radius)
917 6 : return;
918 :
919 6 : for (entry = radius->msgs; entry; entry = entry->next) {
920 0 : if (entry->msg_type == RADIUS_ACCT) {
921 0 : entry->shared_secret = shared_secret;
922 0 : entry->shared_secret_len = shared_secret_len;
923 0 : radius_msg_finish_acct(entry->msg, shared_secret,
924 : shared_secret_len);
925 : }
926 : }
927 : }
928 :
929 :
930 : static int
931 205 : 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)
935 : {
936 : struct sockaddr_in serv, claddr;
937 : #ifdef CONFIG_IPV6
938 : struct sockaddr_in6 serv6, claddr6;
939 : #endif /* CONFIG_IPV6 */
940 : struct sockaddr *addr, *cl_addr;
941 : socklen_t addrlen, claddrlen;
942 : char abuf[50];
943 : int sel_sock;
944 : struct radius_msg_list *entry;
945 205 : struct hostapd_radius_servers *conf = radius->conf;
946 :
947 410 : hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
948 : HOSTAPD_LEVEL_INFO,
949 : "%s server %s:%d",
950 : auth ? "Authentication" : "Accounting",
951 205 : hostapd_ip_txt(&nserv->addr, abuf, sizeof(abuf)),
952 : nserv->port);
953 :
954 205 : if (!oserv || nserv->shared_secret_len != oserv->shared_secret_len ||
955 0 : 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. */
964 205 : if (auth)
965 199 : radius_client_flush(radius, 1);
966 : else {
967 12 : radius_client_update_acct_msgs(
968 6 : radius, nserv->shared_secret,
969 : nserv->shared_secret_len);
970 : }
971 : }
972 :
973 : /* Reset retry counters for the new server */
974 205 : for (entry = radius->msgs; entry; entry = entry->next) {
975 0 : if ((auth && entry->msg_type != RADIUS_AUTH) ||
976 0 : (!auth && entry->msg_type != RADIUS_ACCT))
977 0 : continue;
978 0 : entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
979 0 : entry->attempts = 0;
980 0 : entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
981 : }
982 :
983 205 : if (radius->msgs) {
984 0 : eloop_cancel_timeout(radius_client_timer, radius, NULL);
985 0 : eloop_register_timeout(RADIUS_CLIENT_FIRST_WAIT, 0,
986 : radius_client_timer, radius, NULL);
987 : }
988 :
989 205 : switch (nserv->addr.af) {
990 : case AF_INET:
991 202 : os_memset(&serv, 0, sizeof(serv));
992 202 : serv.sin_family = AF_INET;
993 202 : serv.sin_addr.s_addr = nserv->addr.u.v4.s_addr;
994 202 : serv.sin_port = htons(nserv->port);
995 202 : addr = (struct sockaddr *) &serv;
996 202 : addrlen = sizeof(serv);
997 202 : sel_sock = sock;
998 202 : break;
999 : #ifdef CONFIG_IPV6
1000 : case AF_INET6:
1001 2 : os_memset(&serv6, 0, sizeof(serv6));
1002 2 : serv6.sin6_family = AF_INET6;
1003 2 : os_memcpy(&serv6.sin6_addr, &nserv->addr.u.v6,
1004 : sizeof(struct in6_addr));
1005 2 : serv6.sin6_port = htons(nserv->port);
1006 2 : addr = (struct sockaddr *) &serv6;
1007 2 : addrlen = sizeof(serv6);
1008 2 : sel_sock = sock6;
1009 2 : break;
1010 : #endif /* CONFIG_IPV6 */
1011 : default:
1012 1 : return -1;
1013 : }
1014 :
1015 204 : if (conf->force_client_addr) {
1016 0 : switch (conf->client_addr.af) {
1017 : case AF_INET:
1018 0 : os_memset(&claddr, 0, sizeof(claddr));
1019 0 : claddr.sin_family = AF_INET;
1020 0 : claddr.sin_addr.s_addr = conf->client_addr.u.v4.s_addr;
1021 0 : claddr.sin_port = htons(0);
1022 0 : cl_addr = (struct sockaddr *) &claddr;
1023 0 : claddrlen = sizeof(claddr);
1024 0 : break;
1025 : #ifdef CONFIG_IPV6
1026 : case AF_INET6:
1027 0 : os_memset(&claddr6, 0, sizeof(claddr6));
1028 0 : claddr6.sin6_family = AF_INET6;
1029 0 : os_memcpy(&claddr6.sin6_addr, &conf->client_addr.u.v6,
1030 : sizeof(struct in6_addr));
1031 0 : claddr6.sin6_port = htons(0);
1032 0 : cl_addr = (struct sockaddr *) &claddr6;
1033 0 : claddrlen = sizeof(claddr6);
1034 0 : break;
1035 : #endif /* CONFIG_IPV6 */
1036 : default:
1037 0 : return -1;
1038 : }
1039 :
1040 0 : if (bind(sel_sock, cl_addr, claddrlen) < 0) {
1041 0 : wpa_printf(MSG_INFO, "bind[radius]: %s",
1042 0 : strerror(errno));
1043 0 : return -1;
1044 : }
1045 : }
1046 :
1047 204 : if (connect(sel_sock, addr, addrlen) < 0) {
1048 0 : wpa_printf(MSG_INFO, "connect[radius]: %s", strerror(errno));
1049 0 : return -1;
1050 : }
1051 :
1052 : #ifndef CONFIG_NATIVE_WINDOWS
1053 204 : switch (nserv->addr.af) {
1054 : case AF_INET:
1055 202 : claddrlen = sizeof(claddr);
1056 202 : getsockname(sel_sock, (struct sockaddr *) &claddr, &claddrlen);
1057 202 : wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1058 202 : inet_ntoa(claddr.sin_addr), ntohs(claddr.sin_port));
1059 202 : break;
1060 : #ifdef CONFIG_IPV6
1061 : case AF_INET6: {
1062 2 : claddrlen = sizeof(claddr6);
1063 2 : getsockname(sel_sock, (struct sockaddr *) &claddr6,
1064 : &claddrlen);
1065 2 : wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1066 : inet_ntop(AF_INET6, &claddr6.sin6_addr,
1067 : abuf, sizeof(abuf)),
1068 2 : ntohs(claddr6.sin6_port));
1069 2 : break;
1070 : }
1071 : #endif /* CONFIG_IPV6 */
1072 : }
1073 : #endif /* CONFIG_NATIVE_WINDOWS */
1074 :
1075 204 : if (auth)
1076 199 : radius->auth_sock = sel_sock;
1077 : else
1078 5 : radius->acct_sock = sel_sock;
1079 :
1080 204 : return 0;
1081 : }
1082 :
1083 :
1084 0 : static void radius_retry_primary_timer(void *eloop_ctx, void *timeout_ctx)
1085 : {
1086 0 : struct radius_client_data *radius = eloop_ctx;
1087 0 : struct hostapd_radius_servers *conf = radius->conf;
1088 : struct hostapd_radius_server *oserv;
1089 :
1090 0 : if (radius->auth_sock >= 0 && conf->auth_servers &&
1091 0 : conf->auth_server != conf->auth_servers) {
1092 0 : oserv = conf->auth_server;
1093 0 : conf->auth_server = conf->auth_servers;
1094 0 : radius_change_server(radius, conf->auth_server, oserv,
1095 : radius->auth_serv_sock,
1096 : radius->auth_serv_sock6, 1);
1097 : }
1098 :
1099 0 : if (radius->acct_sock >= 0 && conf->acct_servers &&
1100 0 : conf->acct_server != conf->acct_servers) {
1101 0 : oserv = conf->acct_server;
1102 0 : conf->acct_server = conf->acct_servers;
1103 0 : radius_change_server(radius, conf->acct_server, oserv,
1104 : radius->acct_serv_sock,
1105 : radius->acct_serv_sock6, 0);
1106 : }
1107 :
1108 0 : if (conf->retry_primary_interval)
1109 0 : eloop_register_timeout(conf->retry_primary_interval, 0,
1110 : radius_retry_primary_timer, radius,
1111 : NULL);
1112 0 : }
1113 :
1114 :
1115 205 : static int radius_client_disable_pmtu_discovery(int s)
1116 : {
1117 205 : int r = -1;
1118 : #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
1119 : /* Turn off Path MTU discovery on IPv4/UDP sockets. */
1120 205 : int action = IP_PMTUDISC_DONT;
1121 205 : r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action,
1122 : sizeof(action));
1123 205 : if (r == -1)
1124 0 : wpa_printf(MSG_ERROR, "RADIUS: Failed to set IP_MTU_DISCOVER: %s",
1125 0 : strerror(errno));
1126 : #endif
1127 205 : return r;
1128 : }
1129 :
1130 :
1131 199 : static int radius_client_init_auth(struct radius_client_data *radius)
1132 : {
1133 199 : struct hostapd_radius_servers *conf = radius->conf;
1134 199 : int ok = 0;
1135 :
1136 199 : radius->auth_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1137 199 : if (radius->auth_serv_sock < 0)
1138 0 : wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET,SOCK_DGRAM]: %s",
1139 0 : strerror(errno));
1140 : else {
1141 199 : radius_client_disable_pmtu_discovery(radius->auth_serv_sock);
1142 199 : ok++;
1143 : }
1144 :
1145 : #ifdef CONFIG_IPV6
1146 199 : radius->auth_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1147 199 : if (radius->auth_serv_sock6 < 0)
1148 0 : wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET6,SOCK_DGRAM]: %s",
1149 0 : strerror(errno));
1150 : else
1151 199 : ok++;
1152 : #endif /* CONFIG_IPV6 */
1153 :
1154 199 : if (ok == 0)
1155 0 : return -1;
1156 :
1157 199 : radius_change_server(radius, conf->auth_server, NULL,
1158 : radius->auth_serv_sock, radius->auth_serv_sock6,
1159 : 1);
1160 :
1161 398 : if (radius->auth_serv_sock >= 0 &&
1162 199 : eloop_register_read_sock(radius->auth_serv_sock,
1163 : radius_client_receive, radius,
1164 : (void *) RADIUS_AUTH)) {
1165 0 : wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for authentication server");
1166 0 : return -1;
1167 : }
1168 :
1169 : #ifdef CONFIG_IPV6
1170 398 : if (radius->auth_serv_sock6 >= 0 &&
1171 199 : eloop_register_read_sock(radius->auth_serv_sock6,
1172 : radius_client_receive, radius,
1173 : (void *) RADIUS_AUTH)) {
1174 0 : wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for authentication server");
1175 0 : return -1;
1176 : }
1177 : #endif /* CONFIG_IPV6 */
1178 :
1179 199 : return 0;
1180 : }
1181 :
1182 :
1183 6 : static int radius_client_init_acct(struct radius_client_data *radius)
1184 : {
1185 6 : struct hostapd_radius_servers *conf = radius->conf;
1186 6 : int ok = 0;
1187 :
1188 6 : radius->acct_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1189 6 : if (radius->acct_serv_sock < 0)
1190 0 : wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET,SOCK_DGRAM]: %s",
1191 0 : strerror(errno));
1192 : else {
1193 6 : radius_client_disable_pmtu_discovery(radius->acct_serv_sock);
1194 6 : ok++;
1195 : }
1196 :
1197 : #ifdef CONFIG_IPV6
1198 6 : radius->acct_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1199 6 : if (radius->acct_serv_sock6 < 0)
1200 0 : wpa_printf(MSG_INFO, "RADIUS: socket[PF_INET6,SOCK_DGRAM]: %s",
1201 0 : strerror(errno));
1202 : else
1203 6 : ok++;
1204 : #endif /* CONFIG_IPV6 */
1205 :
1206 6 : if (ok == 0)
1207 0 : return -1;
1208 :
1209 6 : radius_change_server(radius, conf->acct_server, NULL,
1210 : radius->acct_serv_sock, radius->acct_serv_sock6,
1211 : 0);
1212 :
1213 12 : if (radius->acct_serv_sock >= 0 &&
1214 6 : eloop_register_read_sock(radius->acct_serv_sock,
1215 : radius_client_receive, radius,
1216 : (void *) RADIUS_ACCT)) {
1217 0 : wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for accounting server");
1218 0 : return -1;
1219 : }
1220 :
1221 : #ifdef CONFIG_IPV6
1222 12 : if (radius->acct_serv_sock6 >= 0 &&
1223 6 : eloop_register_read_sock(radius->acct_serv_sock6,
1224 : radius_client_receive, radius,
1225 : (void *) RADIUS_ACCT)) {
1226 0 : wpa_printf(MSG_INFO, "RADIUS: Could not register read socket for accounting server");
1227 0 : return -1;
1228 : }
1229 : #endif /* CONFIG_IPV6 */
1230 :
1231 6 : return 0;
1232 : }
1233 :
1234 :
1235 : /**
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
1240 : *
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.
1244 : */
1245 : struct radius_client_data *
1246 552 : radius_client_init(void *ctx, struct hostapd_radius_servers *conf)
1247 : {
1248 : struct radius_client_data *radius;
1249 :
1250 552 : radius = os_zalloc(sizeof(struct radius_client_data));
1251 552 : if (radius == NULL)
1252 0 : return NULL;
1253 :
1254 552 : radius->ctx = ctx;
1255 552 : radius->conf = conf;
1256 552 : radius->auth_serv_sock = radius->acct_serv_sock =
1257 552 : radius->auth_serv_sock6 = radius->acct_serv_sock6 =
1258 552 : radius->auth_sock = radius->acct_sock = -1;
1259 :
1260 552 : if (conf->auth_server && radius_client_init_auth(radius)) {
1261 0 : radius_client_deinit(radius);
1262 0 : return NULL;
1263 : }
1264 :
1265 552 : if (conf->acct_server && radius_client_init_acct(radius)) {
1266 0 : radius_client_deinit(radius);
1267 0 : return NULL;
1268 : }
1269 :
1270 552 : if (conf->retry_primary_interval)
1271 0 : eloop_register_timeout(conf->retry_primary_interval, 0,
1272 : radius_retry_primary_timer, radius,
1273 : NULL);
1274 :
1275 552 : return radius;
1276 : }
1277 :
1278 :
1279 : /**
1280 : * radius_client_deinit - Deinitialize RADIUS client
1281 : * @radius: RADIUS client context from radius_client_init()
1282 : */
1283 556 : void radius_client_deinit(struct radius_client_data *radius)
1284 : {
1285 556 : if (!radius)
1286 560 : return;
1287 :
1288 552 : if (radius->auth_serv_sock >= 0)
1289 199 : eloop_unregister_read_sock(radius->auth_serv_sock);
1290 552 : if (radius->acct_serv_sock >= 0)
1291 6 : eloop_unregister_read_sock(radius->acct_serv_sock);
1292 : #ifdef CONFIG_IPV6
1293 552 : if (radius->auth_serv_sock6 >= 0)
1294 199 : eloop_unregister_read_sock(radius->auth_serv_sock6);
1295 552 : if (radius->acct_serv_sock6 >= 0)
1296 6 : eloop_unregister_read_sock(radius->acct_serv_sock6);
1297 : #endif /* CONFIG_IPV6 */
1298 :
1299 552 : eloop_cancel_timeout(radius_retry_primary_timer, radius, NULL);
1300 :
1301 552 : radius_client_flush(radius, 0);
1302 552 : os_free(radius->auth_handlers);
1303 552 : os_free(radius->acct_handlers);
1304 552 : os_free(radius);
1305 : }
1306 :
1307 :
1308 : /**
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
1312 : *
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.
1317 : */
1318 745 : void radius_client_flush_auth(struct radius_client_data *radius,
1319 : const u8 *addr)
1320 : {
1321 : struct radius_msg_list *entry, *prev, *tmp;
1322 :
1323 745 : prev = NULL;
1324 745 : entry = radius->msgs;
1325 1504 : while (entry) {
1326 18 : if (entry->msg_type == RADIUS_AUTH &&
1327 4 : os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
1328 4 : hostapd_logger(radius->ctx, addr,
1329 : HOSTAPD_MODULE_RADIUS,
1330 : HOSTAPD_LEVEL_DEBUG,
1331 : "Removing pending RADIUS authentication"
1332 : " message for removed client");
1333 :
1334 4 : if (prev)
1335 0 : prev->next = entry->next;
1336 : else
1337 4 : radius->msgs = entry->next;
1338 :
1339 4 : tmp = entry;
1340 4 : entry = entry->next;
1341 4 : radius_client_msg_free(tmp);
1342 4 : radius->num_msgs--;
1343 4 : continue;
1344 : }
1345 :
1346 10 : prev = entry;
1347 10 : entry = entry->next;
1348 : }
1349 745 : }
1350 :
1351 :
1352 3 : static int radius_client_dump_auth_server(char *buf, size_t buflen,
1353 : struct hostapd_radius_server *serv,
1354 : struct radius_client_data *cli)
1355 : {
1356 3 : int pending = 0;
1357 : struct radius_msg_list *msg;
1358 : char abuf[50];
1359 :
1360 3 : if (cli) {
1361 6 : for (msg = cli->msgs; msg; msg = msg->next) {
1362 3 : if (msg->msg_type == RADIUS_AUTH)
1363 1 : pending++;
1364 : }
1365 : }
1366 :
1367 6 : 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",
1383 : serv->index,
1384 3 : hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1385 : serv->port,
1386 : serv->round_trip_time,
1387 : serv->requests,
1388 : serv->retransmissions,
1389 : serv->access_accepts,
1390 : serv->access_rejects,
1391 : serv->access_challenges,
1392 : serv->malformed_responses,
1393 : serv->bad_authenticators,
1394 : pending,
1395 : serv->timeouts,
1396 : serv->unknown_types,
1397 : serv->packets_dropped);
1398 : }
1399 :
1400 :
1401 2 : static int radius_client_dump_acct_server(char *buf, size_t buflen,
1402 : struct hostapd_radius_server *serv,
1403 : struct radius_client_data *cli)
1404 : {
1405 2 : int pending = 0;
1406 : struct radius_msg_list *msg;
1407 : char abuf[50];
1408 :
1409 2 : if (cli) {
1410 4 : for (msg = cli->msgs; msg; msg = msg->next) {
1411 2 : if (msg->msg_type == RADIUS_ACCT ||
1412 0 : msg->msg_type == RADIUS_ACCT_INTERIM)
1413 2 : pending++;
1414 : }
1415 : }
1416 :
1417 4 : 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",
1431 : serv->index,
1432 2 : hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1433 : serv->port,
1434 : serv->round_trip_time,
1435 : serv->requests,
1436 : serv->retransmissions,
1437 : serv->responses,
1438 : serv->malformed_responses,
1439 : serv->bad_authenticators,
1440 : pending,
1441 : serv->timeouts,
1442 : serv->unknown_types,
1443 : serv->packets_dropped);
1444 : }
1445 :
1446 :
1447 : /**
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
1453 : */
1454 3 : int radius_client_get_mib(struct radius_client_data *radius, char *buf,
1455 : size_t buflen)
1456 : {
1457 3 : struct hostapd_radius_servers *conf = radius->conf;
1458 : int i;
1459 : struct hostapd_radius_server *serv;
1460 3 : int count = 0;
1461 :
1462 3 : if (conf->auth_servers) {
1463 6 : for (i = 0; i < conf->num_auth_servers; i++) {
1464 3 : serv = &conf->auth_servers[i];
1465 3 : count += radius_client_dump_auth_server(
1466 : buf + count, buflen - count, serv,
1467 3 : serv == conf->auth_server ?
1468 : radius : NULL);
1469 : }
1470 : }
1471 :
1472 3 : if (conf->acct_servers) {
1473 4 : for (i = 0; i < conf->num_acct_servers; i++) {
1474 2 : serv = &conf->acct_servers[i];
1475 2 : count += radius_client_dump_acct_server(
1476 : buf + count, buflen - count, serv,
1477 2 : serv == conf->acct_server ?
1478 : radius : NULL);
1479 : }
1480 : }
1481 :
1482 3 : return count;
1483 : }
1484 :
1485 :
1486 18 : void radius_client_reconfig(struct radius_client_data *radius,
1487 : struct hostapd_radius_servers *conf)
1488 : {
1489 18 : if (radius)
1490 18 : radius->conf = conf;
1491 18 : }
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