Fix denial of service - memory corruption.
[Samba.git] / source3 / winbindd / winbindd_dual.c
blob117d55d2dacf214063bcccb5b4977edfc1fb664f
1 /*
2 Unix SMB/CIFS implementation.
4 Winbind child daemons
6 Copyright (C) Andrew Tridgell 2002
7 Copyright (C) Volker Lendecke 2004,2005
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * We fork a child per domain to be able to act non-blocking in the main
25 * winbind daemon. A domain controller thousands of miles away being being
26 * slow replying with a 10.000 user list should not hold up netlogon calls
27 * that can be handled locally.
30 #include "includes.h"
31 #include "winbindd.h"
32 #include "../../nsswitch/libwbclient/wbc_async.h"
34 #undef DBGC_CLASS
35 #define DBGC_CLASS DBGC_WINBIND
37 extern bool override_logfile;
38 extern struct winbindd_methods cache_methods;
40 /* Read some data from a client connection */
42 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
44 NTSTATUS status;
46 /* Read data */
48 status = read_data(state->sock, (char *)state->request,
49 sizeof(*state->request));
51 if (!NT_STATUS_IS_OK(status)) {
52 DEBUG(3, ("child_read_request: read_data failed: %s\n",
53 nt_errstr(status)));
54 return status;
57 if (state->request->extra_len == 0) {
58 state->request->extra_data.data = NULL;
59 return NT_STATUS_OK;
62 DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
64 state->request->extra_data.data =
65 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
67 if (state->request->extra_data.data == NULL) {
68 DEBUG(0, ("malloc failed\n"));
69 return NT_STATUS_NO_MEMORY;
72 /* Ensure null termination */
73 state->request->extra_data.data[state->request->extra_len] = '\0';
75 status= read_data(state->sock, state->request->extra_data.data,
76 state->request->extra_len);
78 if (!NT_STATUS_IS_OK(status)) {
79 DEBUG(0, ("Could not read extra data: %s\n",
80 nt_errstr(status)));
82 return status;
86 * Do winbind child async request. This is not simply wb_simple_trans. We have
87 * to do the queueing ourselves because while a request is queued, the child
88 * might have crashed, and we have to re-fork it in the _trigger function.
91 struct wb_child_request_state {
92 struct tevent_context *ev;
93 struct winbindd_child *child;
94 struct winbindd_request *request;
95 struct winbindd_response *response;
98 static bool fork_domain_child(struct winbindd_child *child);
100 static void wb_child_request_trigger(struct tevent_req *req,
101 void *private_data);
102 static void wb_child_request_done(struct tevent_req *subreq);
104 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
105 struct tevent_context *ev,
106 struct winbindd_child *child,
107 struct winbindd_request *request)
109 struct tevent_req *req;
110 struct wb_child_request_state *state;
112 req = tevent_req_create(mem_ctx, &state,
113 struct wb_child_request_state);
114 if (req == NULL) {
115 return NULL;
118 state->ev = ev;
119 state->child = child;
120 state->request = request;
122 if (!tevent_queue_add(child->queue, ev, req,
123 wb_child_request_trigger, NULL)) {
124 tevent_req_nomem(NULL, req);
125 return tevent_req_post(req, ev);
127 return req;
130 static void wb_child_request_trigger(struct tevent_req *req,
131 void *private_data)
133 struct wb_child_request_state *state = tevent_req_data(
134 req, struct wb_child_request_state);
135 struct tevent_req *subreq;
137 if ((state->child->pid == 0) && (!fork_domain_child(state->child))) {
138 tevent_req_error(req, errno);
139 return;
142 subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
143 state->child->sock, state->request);
144 if (tevent_req_nomem(subreq, req)) {
145 return;
147 tevent_req_set_callback(subreq, wb_child_request_done, req);
149 if (!tevent_req_set_endtime(req, state->ev,
150 timeval_current_ofs(300, 0))) {
151 tevent_req_nomem(NULL, req);
152 return;
156 static void wb_child_request_done(struct tevent_req *subreq)
158 struct tevent_req *req = tevent_req_callback_data(
159 subreq, struct tevent_req);
160 struct wb_child_request_state *state = tevent_req_data(
161 req, struct wb_child_request_state);
162 int ret, err;
164 ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
165 TALLOC_FREE(subreq);
166 if (ret == -1) {
167 tevent_req_error(req, err);
168 return;
170 tevent_req_done(req);
173 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
174 struct winbindd_response **presponse, int *err)
176 struct wb_child_request_state *state = tevent_req_data(
177 req, struct wb_child_request_state);
179 if (tevent_req_is_unix_error(req, err)) {
180 return -1;
182 *presponse = talloc_move(mem_ctx, &state->response);
183 return 0;
186 struct wb_domain_request_state {
187 struct tevent_context *ev;
188 struct winbindd_domain *domain;
189 struct winbindd_request *request;
190 struct winbindd_request *init_req;
191 struct winbindd_response *response;
194 static void wb_domain_request_gotdc(struct tevent_req *subreq);
195 static void wb_domain_request_initialized(struct tevent_req *subreq);
196 static void wb_domain_request_done(struct tevent_req *subreq);
198 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
199 struct tevent_context *ev,
200 struct winbindd_domain *domain,
201 struct winbindd_request *request)
203 struct tevent_req *req, *subreq;
204 struct wb_domain_request_state *state;
206 req = tevent_req_create(mem_ctx, &state,
207 struct wb_domain_request_state);
208 if (req == NULL) {
209 return NULL;
212 if (domain->initialized) {
213 subreq = wb_child_request_send(state, ev, &domain->child,
214 request);
215 if (tevent_req_nomem(subreq, req)) {
216 return tevent_req_post(req, ev);
218 tevent_req_set_callback(subreq, wb_domain_request_done, req);
219 return req;
222 state->domain = domain;
223 state->ev = ev;
224 state->request = request;
226 state->init_req = talloc_zero(state, struct winbindd_request);
227 if (tevent_req_nomem(state->init_req, req)) {
228 return tevent_req_post(req, ev);
231 if (IS_DC || domain->primary || domain->internal) {
232 /* The primary domain has to find the DC name itself */
233 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
234 fstrcpy(state->init_req->domain_name, domain->name);
235 state->init_req->data.init_conn.is_primary =
236 domain->primary ? true : false;
237 fstrcpy(state->init_req->data.init_conn.dcname, "");
239 subreq = wb_child_request_send(state, ev, &domain->child,
240 state->init_req);
241 if (tevent_req_nomem(subreq, req)) {
242 return tevent_req_post(req, ev);
244 tevent_req_set_callback(subreq, wb_domain_request_initialized,
245 req);
246 return req;
250 * Ask our DC for a DC name
252 domain = find_our_domain();
254 /* This is *not* the primary domain, let's ask our DC about a DC
255 * name */
257 state->init_req->cmd = WINBINDD_GETDCNAME;
258 fstrcpy(state->init_req->domain_name, domain->name);
260 subreq = wb_child_request_send(state, ev, &domain->child, request);
261 if (tevent_req_nomem(subreq, req)) {
262 return tevent_req_post(req, ev);
264 tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
265 return req;
268 static void wb_domain_request_gotdc(struct tevent_req *subreq)
270 struct tevent_req *req = tevent_req_callback_data(
271 subreq, struct tevent_req);
272 struct wb_domain_request_state *state = tevent_req_data(
273 req, struct wb_domain_request_state);
274 struct winbindd_response *response;
275 int ret, err;
277 ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
278 TALLOC_FREE(subreq);
279 if (ret == -1) {
280 tevent_req_error(req, err);
281 return;
283 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
284 fstrcpy(state->init_req->domain_name, state->domain->name);
285 state->init_req->data.init_conn.is_primary = False;
286 fstrcpy(state->init_req->data.init_conn.dcname,
287 response->data.dc_name);
289 TALLOC_FREE(response);
291 subreq = wb_child_request_send(state, state->ev, &state->domain->child,
292 state->init_req);
293 if (tevent_req_nomem(subreq, req)) {
294 return;
296 tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
299 static void wb_domain_request_initialized(struct tevent_req *subreq)
301 struct tevent_req *req = tevent_req_callback_data(
302 subreq, struct tevent_req);
303 struct wb_domain_request_state *state = tevent_req_data(
304 req, struct wb_domain_request_state);
305 struct winbindd_response *response;
306 int ret, err;
308 ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
309 TALLOC_FREE(subreq);
310 if (ret == -1) {
311 tevent_req_error(req, err);
312 return;
315 if (!string_to_sid(&state->domain->sid,
316 response->data.domain_info.sid)) {
317 DEBUG(1,("init_child_recv: Could not convert sid %s "
318 "from string\n", response->data.domain_info.sid));
319 tevent_req_error(req, EINVAL);
320 return;
322 fstrcpy(state->domain->name, response->data.domain_info.name);
323 fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
324 state->domain->native_mode = response->data.domain_info.native_mode;
325 state->domain->active_directory =
326 response->data.domain_info.active_directory;
327 state->domain->initialized = true;
329 TALLOC_FREE(response);
331 subreq = wb_child_request_send(state, state->ev, &state->domain->child,
332 state->request);
333 if (tevent_req_nomem(subreq, req)) {
334 return;
336 tevent_req_set_callback(subreq, wb_domain_request_done, req);
339 static void wb_domain_request_done(struct tevent_req *subreq)
341 struct tevent_req *req = tevent_req_callback_data(
342 subreq, struct tevent_req);
343 struct wb_domain_request_state *state = tevent_req_data(
344 req, struct wb_domain_request_state);
345 int ret, err;
347 ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
348 &err);
349 TALLOC_FREE(subreq);
350 if (ret == -1) {
351 tevent_req_error(req, err);
352 return;
354 tevent_req_done(req);
357 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
358 struct winbindd_response **presponse, int *err)
360 struct wb_domain_request_state *state = tevent_req_data(
361 req, struct wb_domain_request_state);
363 if (tevent_req_is_unix_error(req, err)) {
364 return -1;
366 *presponse = talloc_move(mem_ctx, &state->response);
367 return 0;
370 struct domain_request_state {
371 struct winbindd_domain *domain;
372 struct winbindd_request *request;
373 struct winbindd_response *response;
374 void (*continuation)(void *private_data_data, bool success);
375 void *private_data_data;
378 static void async_domain_request_done(struct tevent_req *req);
380 void async_domain_request(TALLOC_CTX *mem_ctx,
381 struct winbindd_domain *domain,
382 struct winbindd_request *request,
383 struct winbindd_response *response,
384 void (*continuation)(void *private_data_data, bool success),
385 void *private_data_data)
387 struct tevent_req *subreq;
388 struct domain_request_state *state;
390 state = TALLOC_P(mem_ctx, struct domain_request_state);
391 if (state == NULL) {
392 DEBUG(0, ("talloc failed\n"));
393 continuation(private_data_data, False);
394 return;
397 state->domain = domain;
398 state->request = request;
399 state->response = response;
400 state->continuation = continuation;
401 state->private_data_data = private_data_data;
403 subreq = wb_domain_request_send(state, winbind_event_context(),
404 domain, request);
405 if (subreq == NULL) {
406 DEBUG(5, ("wb_domain_request_send failed\n"));
407 continuation(private_data_data, false);
408 return;
410 tevent_req_set_callback(subreq, async_domain_request_done, state);
413 static void async_domain_request_done(struct tevent_req *req)
415 struct domain_request_state *state = tevent_req_callback_data(
416 req, struct domain_request_state);
417 struct winbindd_response *response;
418 int ret, err;
420 ret = wb_domain_request_recv(req, state, &response, &err);
421 TALLOC_FREE(req);
422 if (ret == -1) {
423 DEBUG(5, ("wb_domain_request returned %s\n", strerror(err)));
424 state->continuation(state->private_data_data, false);
425 return;
427 *(state->response) = *response;
428 state->continuation(state->private_data_data, true);
431 static void recvfrom_child(void *private_data_data, bool success)
433 struct winbindd_cli_state *state =
434 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
435 enum winbindd_result result = state->response->result;
437 /* This is an optimization: The child has written directly to the
438 * response buffer. The request itself is still in pending state,
439 * state that in the result code. */
441 state->response->result = WINBINDD_PENDING;
443 if ((!success) || (result != WINBINDD_OK)) {
444 request_error(state);
445 return;
448 request_ok(state);
451 void sendto_domain(struct winbindd_cli_state *state,
452 struct winbindd_domain *domain)
454 async_domain_request(state->mem_ctx, domain,
455 state->request, state->response,
456 recvfrom_child, state);
459 static void child_process_request(struct winbindd_child *child,
460 struct winbindd_cli_state *state)
462 struct winbindd_domain *domain = child->domain;
463 const struct winbindd_child_dispatch_table *table = child->table;
465 /* Free response data - we may be interrupted and receive another
466 command before being able to send this data off. */
468 state->response->result = WINBINDD_ERROR;
469 state->response->length = sizeof(struct winbindd_response);
471 /* as all requests in the child are sync, we can use talloc_tos() */
472 state->mem_ctx = talloc_tos();
474 /* Process command */
476 for (; table->name; table++) {
477 if (state->request->cmd == table->struct_cmd) {
478 DEBUG(10,("child_process_request: request fn %s\n",
479 table->name));
480 state->response->result = table->struct_fn(domain, state);
481 return;
485 DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
486 (int)state->request->cmd));
487 state->response->result = WINBINDD_ERROR;
490 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
491 const struct winbindd_child_dispatch_table *table,
492 const char *logprefix,
493 const char *logname)
495 if (logprefix && logname) {
496 if (asprintf(&child->logfilename, "%s/%s-%s",
497 get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
498 smb_panic("Internal error: asprintf failed");
500 } else {
501 smb_panic("Internal error: logprefix == NULL && "
502 "logname == NULL");
505 child->domain = domain;
506 child->table = table;
507 child->queue = tevent_queue_create(NULL, "winbind_child");
508 SMB_ASSERT(child->queue != NULL);
509 child->rpccli = wbint_rpccli_create(NULL, domain, child);
510 SMB_ASSERT(child->rpccli != NULL);
513 struct winbindd_child *children = NULL;
515 void winbind_child_died(pid_t pid)
517 struct winbindd_child *child;
519 for (child = children; child != NULL; child = child->next) {
520 if (child->pid == pid) {
521 break;
525 if (child == NULL) {
526 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
527 return;
530 /* This will be re-added in fork_domain_child() */
532 DLIST_REMOVE(children, child);
534 close(child->sock);
535 child->sock = -1;
536 child->pid = 0;
539 /* Ensure any negative cache entries with the netbios or realm names are removed. */
541 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
543 flush_negative_conn_cache_for_domain(domain->name);
544 if (*domain->alt_name) {
545 flush_negative_conn_cache_for_domain(domain->alt_name);
550 * Parent winbindd process sets its own debug level first and then
551 * sends a message to all the winbindd children to adjust their debug
552 * level to that of parents.
555 void winbind_msg_debug(struct messaging_context *msg_ctx,
556 void *private_data,
557 uint32_t msg_type,
558 struct server_id server_id,
559 DATA_BLOB *data)
561 struct winbindd_child *child;
563 DEBUG(10,("winbind_msg_debug: got debug message.\n"));
565 debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
567 for (child = children; child != NULL; child = child->next) {
569 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
570 (unsigned int)child->pid));
572 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
573 MSG_DEBUG,
574 data->data,
575 strlen((char *) data->data) + 1);
579 /* Set our domains as offline and forward the offline message to our children. */
581 void winbind_msg_offline(struct messaging_context *msg_ctx,
582 void *private_data,
583 uint32_t msg_type,
584 struct server_id server_id,
585 DATA_BLOB *data)
587 struct winbindd_child *child;
588 struct winbindd_domain *domain;
590 DEBUG(10,("winbind_msg_offline: got offline message.\n"));
592 if (!lp_winbind_offline_logon()) {
593 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
594 return;
597 /* Set our global state as offline. */
598 if (!set_global_winbindd_state_offline()) {
599 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
600 return;
603 /* Set all our domains as offline. */
604 for (domain = domain_list(); domain; domain = domain->next) {
605 if (domain->internal) {
606 continue;
608 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
609 set_domain_offline(domain);
612 for (child = children; child != NULL; child = child->next) {
613 /* Don't send message to internal childs. We've already
614 done so above. */
615 if (!child->domain || winbindd_internal_child(child)) {
616 continue;
619 /* Or internal domains (this should not be possible....) */
620 if (child->domain->internal) {
621 continue;
624 /* Each winbindd child should only process requests for one domain - make sure
625 we only set it online / offline for that domain. */
627 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
628 (unsigned int)child->pid, domain->name ));
630 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
631 MSG_WINBIND_OFFLINE,
632 (uint8 *)child->domain->name,
633 strlen(child->domain->name)+1);
637 /* Set our domains as online and forward the online message to our children. */
639 void winbind_msg_online(struct messaging_context *msg_ctx,
640 void *private_data,
641 uint32_t msg_type,
642 struct server_id server_id,
643 DATA_BLOB *data)
645 struct winbindd_child *child;
646 struct winbindd_domain *domain;
648 DEBUG(10,("winbind_msg_online: got online message.\n"));
650 if (!lp_winbind_offline_logon()) {
651 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
652 return;
655 /* Set our global state as online. */
656 set_global_winbindd_state_online();
658 smb_nscd_flush_user_cache();
659 smb_nscd_flush_group_cache();
661 /* Set all our domains as online. */
662 for (domain = domain_list(); domain; domain = domain->next) {
663 if (domain->internal) {
664 continue;
666 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
668 winbindd_flush_negative_conn_cache(domain);
669 set_domain_online_request(domain);
671 /* Send an online message to the idmap child when our
672 primary domain comes back online */
674 if ( domain->primary ) {
675 struct winbindd_child *idmap = idmap_child();
677 if ( idmap->pid != 0 ) {
678 messaging_send_buf(msg_ctx,
679 pid_to_procid(idmap->pid),
680 MSG_WINBIND_ONLINE,
681 (uint8 *)domain->name,
682 strlen(domain->name)+1);
687 for (child = children; child != NULL; child = child->next) {
688 /* Don't send message to internal childs. */
689 if (!child->domain || winbindd_internal_child(child)) {
690 continue;
693 /* Or internal domains (this should not be possible....) */
694 if (child->domain->internal) {
695 continue;
698 /* Each winbindd child should only process requests for one domain - make sure
699 we only set it online / offline for that domain. */
701 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
702 (unsigned int)child->pid, child->domain->name ));
704 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
705 MSG_WINBIND_ONLINE,
706 (uint8 *)child->domain->name,
707 strlen(child->domain->name)+1);
711 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
713 struct winbindd_domain *domain;
714 char *buf = NULL;
716 if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
717 get_global_winbindd_state_offline() ?
718 "Offline":"Online")) == NULL) {
719 return NULL;
722 for (domain = domain_list(); domain; domain = domain->next) {
723 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
724 domain->name,
725 domain->online ?
726 "Online":"Offline")) == NULL) {
727 return NULL;
731 buf = talloc_asprintf_append_buffer(buf, "\n");
733 DEBUG(5,("collect_onlinestatus: %s", buf));
735 return buf;
738 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
739 void *private_data,
740 uint32_t msg_type,
741 struct server_id server_id,
742 DATA_BLOB *data)
744 TALLOC_CTX *mem_ctx;
745 const char *message;
746 struct server_id *sender;
748 DEBUG(5,("winbind_msg_onlinestatus received.\n"));
750 if (!data->data) {
751 return;
754 sender = (struct server_id *)data->data;
756 mem_ctx = talloc_init("winbind_msg_onlinestatus");
757 if (mem_ctx == NULL) {
758 return;
761 message = collect_onlinestatus(mem_ctx);
762 if (message == NULL) {
763 talloc_destroy(mem_ctx);
764 return;
767 messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
768 (uint8 *)message, strlen(message) + 1);
770 talloc_destroy(mem_ctx);
773 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
774 void *private_data,
775 uint32_t msg_type,
776 struct server_id server_id,
777 DATA_BLOB *data)
779 struct winbindd_child *child;
781 DEBUG(10,("winbind_msg_dump_event_list received\n"));
783 dump_event_list(winbind_event_context());
785 for (child = children; child != NULL; child = child->next) {
787 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
788 (unsigned int)child->pid));
790 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
791 MSG_DUMP_EVENT_LIST,
792 NULL, 0);
797 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
798 void *private_data,
799 uint32_t msg_type,
800 struct server_id server_id,
801 DATA_BLOB *data)
803 TALLOC_CTX *mem_ctx;
804 const char *message = NULL;
805 struct server_id *sender = NULL;
806 const char *domain = NULL;
807 char *s = NULL;
808 NTSTATUS status;
809 struct winbindd_domain *dom = NULL;
811 DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
813 if (!data || !data->data) {
814 return;
817 if (data->length < sizeof(struct server_id)) {
818 return;
821 mem_ctx = talloc_init("winbind_msg_dump_domain_list");
822 if (!mem_ctx) {
823 return;
826 sender = (struct server_id *)data->data;
827 if (data->length > sizeof(struct server_id)) {
828 domain = (const char *)data->data+sizeof(struct server_id);
831 if (domain) {
833 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
834 domain));
836 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
837 find_domain_from_name_noinit(domain));
838 if (!message) {
839 talloc_destroy(mem_ctx);
840 return;
843 messaging_send_buf(msg_ctx, *sender,
844 MSG_WINBIND_DUMP_DOMAIN_LIST,
845 (uint8_t *)message, strlen(message) + 1);
847 talloc_destroy(mem_ctx);
849 return;
852 DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
854 for (dom = domain_list(); dom; dom=dom->next) {
855 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
856 if (!message) {
857 talloc_destroy(mem_ctx);
858 return;
861 s = talloc_asprintf_append(s, "%s\n", message);
862 if (!s) {
863 talloc_destroy(mem_ctx);
864 return;
868 status = messaging_send_buf(msg_ctx, *sender,
869 MSG_WINBIND_DUMP_DOMAIN_LIST,
870 (uint8_t *)s, strlen(s) + 1);
871 if (!NT_STATUS_IS_OK(status)) {
872 DEBUG(0,("failed to send message: %s\n",
873 nt_errstr(status)));
876 talloc_destroy(mem_ctx);
879 static void account_lockout_policy_handler(struct event_context *ctx,
880 struct timed_event *te,
881 struct timeval now,
882 void *private_data)
884 struct winbindd_child *child =
885 (struct winbindd_child *)private_data;
886 TALLOC_CTX *mem_ctx = NULL;
887 struct winbindd_methods *methods;
888 struct samr_DomInfo12 lockout_policy;
889 NTSTATUS result;
891 DEBUG(10,("account_lockout_policy_handler called\n"));
893 TALLOC_FREE(child->lockout_policy_event);
895 if ( !winbindd_can_contact_domain( child->domain ) ) {
896 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
897 "do not have an incoming trust to domain %s\n",
898 child->domain->name));
900 return;
903 methods = child->domain->methods;
905 mem_ctx = talloc_init("account_lockout_policy_handler ctx");
906 if (!mem_ctx) {
907 result = NT_STATUS_NO_MEMORY;
908 } else {
909 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
911 TALLOC_FREE(mem_ctx);
913 if (!NT_STATUS_IS_OK(result)) {
914 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
915 nt_errstr(result)));
918 child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
919 timeval_current_ofs(3600, 0),
920 account_lockout_policy_handler,
921 child);
924 static time_t get_machine_password_timeout(void)
926 /* until we have gpo support use lp setting */
927 return lp_machine_password_timeout();
930 static bool calculate_next_machine_pwd_change(const char *domain,
931 struct timeval *t)
933 time_t pass_last_set_time;
934 time_t timeout;
935 time_t next_change;
936 struct timeval tv;
937 char *pw;
939 pw = secrets_fetch_machine_password(domain,
940 &pass_last_set_time,
941 NULL);
943 if (pw == NULL) {
944 DEBUG(0,("cannot fetch own machine password ????"));
945 return false;
948 SAFE_FREE(pw);
950 timeout = get_machine_password_timeout();
951 if (timeout == 0) {
952 DEBUG(10,("machine password never expires\n"));
953 return false;
956 tv.tv_sec = pass_last_set_time;
957 DEBUG(10, ("password last changed %s\n",
958 timeval_string(talloc_tos(), &tv, false)));
959 tv.tv_sec += timeout;
960 DEBUGADD(10, ("password valid until %s\n",
961 timeval_string(talloc_tos(), &tv, false)));
963 if (time(NULL) < (pass_last_set_time + timeout)) {
964 next_change = pass_last_set_time + timeout;
965 DEBUG(10,("machine password still valid until: %s\n",
966 http_timestring(talloc_tos(), next_change)));
967 *t = timeval_set(next_change, 0);
969 if (lp_clustering()) {
970 uint8_t randbuf;
972 * When having a cluster, we have several
973 * winbinds racing for the password change. In
974 * the machine_password_change_handler()
975 * function we check if someone else was
976 * faster when the event triggers. We add a
977 * 255-second random delay here, so that we
978 * don't run to change the password at the
979 * exact same moment.
981 generate_random_buffer(&randbuf, sizeof(randbuf));
982 DEBUG(10, ("adding %d seconds randomness\n",
983 (int)randbuf));
984 t->tv_sec += randbuf;
986 return true;
989 DEBUG(10,("machine password expired, needs immediate change\n"));
991 *t = timeval_zero();
993 return true;
996 static void machine_password_change_handler(struct event_context *ctx,
997 struct timed_event *te,
998 struct timeval now,
999 void *private_data)
1001 struct winbindd_child *child =
1002 (struct winbindd_child *)private_data;
1003 struct rpc_pipe_client *netlogon_pipe = NULL;
1004 TALLOC_CTX *frame;
1005 NTSTATUS result;
1006 struct timeval next_change;
1008 DEBUG(10,("machine_password_change_handler called\n"));
1010 TALLOC_FREE(child->machine_password_change_event);
1012 if (!calculate_next_machine_pwd_change(child->domain->name,
1013 &next_change)) {
1014 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1015 return;
1018 DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1019 timeval_string(talloc_tos(), &next_change, false)));
1021 if (!timeval_expired(&next_change)) {
1022 DEBUG(10, ("Someone else has already changed the pw\n"));
1023 goto done;
1026 if (!winbindd_can_contact_domain(child->domain)) {
1027 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1028 "do not have an incoming trust to domain %s\n",
1029 child->domain->name));
1030 return;
1033 result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1034 if (!NT_STATUS_IS_OK(result)) {
1035 DEBUG(10,("machine_password_change_handler: "
1036 "failed to connect netlogon pipe: %s\n",
1037 nt_errstr(result)));
1038 return;
1041 frame = talloc_stackframe();
1043 result = trust_pw_find_change_and_store_it(netlogon_pipe,
1044 frame,
1045 child->domain->name);
1046 TALLOC_FREE(frame);
1048 DEBUG(10, ("machine_password_change_handler: "
1049 "trust_pw_find_change_and_store_it returned %s\n",
1050 nt_errstr(result)));
1052 if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1053 DEBUG(3,("machine_password_change_handler: password set returned "
1054 "ACCESS_DENIED. Maybe the trust account "
1055 "password was changed and we didn't know it. "
1056 "Killing connections to domain %s\n",
1057 child->domain->name));
1058 TALLOC_FREE(child->domain->conn.netlogon_pipe);
1061 if (!calculate_next_machine_pwd_change(child->domain->name,
1062 &next_change)) {
1063 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1064 return;
1067 DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1068 timeval_string(talloc_tos(), &next_change, false)));
1070 if (!NT_STATUS_IS_OK(result)) {
1071 struct timeval tmp;
1073 * In case of failure, give the DC a minute to recover
1075 tmp = timeval_current_ofs(60, 0);
1076 next_change = timeval_max(&next_change, &tmp);
1079 done:
1080 child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1081 next_change,
1082 machine_password_change_handler,
1083 child);
1086 /* Deal with a request to go offline. */
1088 static void child_msg_offline(struct messaging_context *msg,
1089 void *private_data,
1090 uint32_t msg_type,
1091 struct server_id server_id,
1092 DATA_BLOB *data)
1094 struct winbindd_domain *domain;
1095 struct winbindd_domain *primary_domain = NULL;
1096 const char *domainname = (const char *)data->data;
1098 if (data->data == NULL || data->length == 0) {
1099 return;
1102 DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1104 if (!lp_winbind_offline_logon()) {
1105 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1106 return;
1109 primary_domain = find_our_domain();
1111 /* Mark the requested domain offline. */
1113 for (domain = domain_list(); domain; domain = domain->next) {
1114 if (domain->internal) {
1115 continue;
1117 if (strequal(domain->name, domainname)) {
1118 DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1119 set_domain_offline(domain);
1120 /* we are in the trusted domain, set the primary domain
1121 * offline too */
1122 if (domain != primary_domain) {
1123 set_domain_offline(primary_domain);
1129 /* Deal with a request to go online. */
1131 static void child_msg_online(struct messaging_context *msg,
1132 void *private_data,
1133 uint32_t msg_type,
1134 struct server_id server_id,
1135 DATA_BLOB *data)
1137 struct winbindd_domain *domain;
1138 struct winbindd_domain *primary_domain = NULL;
1139 const char *domainname = (const char *)data->data;
1141 if (data->data == NULL || data->length == 0) {
1142 return;
1145 DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1147 if (!lp_winbind_offline_logon()) {
1148 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1149 return;
1152 primary_domain = find_our_domain();
1154 /* Set our global state as online. */
1155 set_global_winbindd_state_online();
1157 /* Try and mark everything online - delete any negative cache entries
1158 to force a reconnect now. */
1160 for (domain = domain_list(); domain; domain = domain->next) {
1161 if (domain->internal) {
1162 continue;
1164 if (strequal(domain->name, domainname)) {
1165 DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1166 winbindd_flush_negative_conn_cache(domain);
1167 set_domain_online_request(domain);
1169 /* we can be in trusted domain, which will contact primary domain
1170 * we have to bring primary domain online in trusted domain process
1171 * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1172 * --> contact_domain = find_our_domain()
1173 * */
1174 if (domain != primary_domain) {
1175 winbindd_flush_negative_conn_cache(primary_domain);
1176 set_domain_online_request(primary_domain);
1182 static void child_msg_dump_event_list(struct messaging_context *msg,
1183 void *private_data,
1184 uint32_t msg_type,
1185 struct server_id server_id,
1186 DATA_BLOB *data)
1188 DEBUG(5,("child_msg_dump_event_list received\n"));
1190 dump_event_list(winbind_event_context());
1193 bool winbindd_reinit_after_fork(const char *logfilename)
1195 struct winbindd_domain *domain;
1196 struct winbindd_child *cl;
1198 if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1199 winbind_event_context(),
1200 true))) {
1201 DEBUG(0,("reinit_after_fork() failed\n"));
1202 return false;
1205 close_conns_after_fork();
1207 if (!override_logfile && logfilename) {
1208 lp_set_logfile(logfilename);
1209 reopen_logs();
1212 if (!winbindd_setup_sig_term_handler(false))
1213 return false;
1214 if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1215 logfilename))
1216 return false;
1218 /* Stop zombies in children */
1219 CatchChild();
1221 /* Don't handle the same messages as our parent. */
1222 messaging_deregister(winbind_messaging_context(),
1223 MSG_SMB_CONF_UPDATED, NULL);
1224 messaging_deregister(winbind_messaging_context(),
1225 MSG_SHUTDOWN, NULL);
1226 messaging_deregister(winbind_messaging_context(),
1227 MSG_WINBIND_OFFLINE, NULL);
1228 messaging_deregister(winbind_messaging_context(),
1229 MSG_WINBIND_ONLINE, NULL);
1230 messaging_deregister(winbind_messaging_context(),
1231 MSG_WINBIND_ONLINESTATUS, NULL);
1232 messaging_deregister(winbind_messaging_context(),
1233 MSG_DUMP_EVENT_LIST, NULL);
1234 messaging_deregister(winbind_messaging_context(),
1235 MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1236 messaging_deregister(winbind_messaging_context(),
1237 MSG_DEBUG, NULL);
1239 /* We have destroyed all events in the winbindd_event_context
1240 * in reinit_after_fork(), so clean out all possible pending
1241 * event pointers. */
1243 /* Deal with check_online_events. */
1245 for (domain = domain_list(); domain; domain = domain->next) {
1246 TALLOC_FREE(domain->check_online_event);
1249 /* Ensure we're not handling a credential cache event inherited
1250 * from our parent. */
1252 ccache_remove_all_after_fork();
1254 /* Destroy all possible events in child list. */
1255 for (cl = children; cl != NULL; cl = cl->next) {
1256 TALLOC_FREE(cl->lockout_policy_event);
1257 TALLOC_FREE(cl->machine_password_change_event);
1259 /* Children should never be able to send
1260 * each other messages, all messages must
1261 * go through the parent.
1263 cl->pid = (pid_t)0;
1266 * This is a little tricky, children must not
1267 * send an MSG_WINBIND_ONLINE message to idmap_child().
1268 * If we are in a child of our primary domain or
1269 * in the process created by fork_child_dc_connect(),
1270 * and the primary domain cannot go online,
1271 * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1272 * periodically to idmap_child().
1274 * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1275 * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1276 * ---> init_dc_connection() ---> cm_open_connection --->
1277 * set_domain_online(), sends MSG_WINBIND_ONLINE to
1278 * idmap_child(). Disallow children sending messages
1279 * to each other, all messages must go through the parent.
1281 cl = idmap_child();
1282 cl->pid = (pid_t)0;
1284 return true;
1288 * In a child there will be only one domain, reference that here.
1290 static struct winbindd_domain *child_domain;
1292 struct winbindd_domain *wb_child_domain(void)
1294 return child_domain;
1297 static bool fork_domain_child(struct winbindd_child *child)
1299 int fdpair[2];
1300 struct winbindd_cli_state state;
1301 struct winbindd_request request;
1302 struct winbindd_response response;
1303 struct winbindd_domain *primary_domain = NULL;
1305 if (child->domain) {
1306 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1307 child->domain->name));
1308 } else {
1309 DEBUG(10, ("fork_domain_child called without domain.\n"));
1311 child_domain = child->domain;
1313 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1314 DEBUG(0, ("Could not open child pipe: %s\n",
1315 strerror(errno)));
1316 return False;
1319 ZERO_STRUCT(state);
1320 state.pid = sys_getpid();
1321 state.request = &request;
1322 state.response = &response;
1324 child->pid = sys_fork();
1326 if (child->pid == -1) {
1327 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1328 return False;
1331 if (child->pid != 0) {
1332 /* Parent */
1333 close(fdpair[0]);
1334 child->next = child->prev = NULL;
1335 DLIST_ADD(children, child);
1336 child->sock = fdpair[1];
1337 return True;
1340 /* Child */
1342 DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1344 state.sock = fdpair[0];
1345 close(fdpair[1]);
1347 if (!winbindd_reinit_after_fork(child->logfilename)) {
1348 _exit(0);
1351 /* Handle online/offline messages. */
1352 messaging_register(winbind_messaging_context(), NULL,
1353 MSG_WINBIND_OFFLINE, child_msg_offline);
1354 messaging_register(winbind_messaging_context(), NULL,
1355 MSG_WINBIND_ONLINE, child_msg_online);
1356 messaging_register(winbind_messaging_context(), NULL,
1357 MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1358 messaging_register(winbind_messaging_context(), NULL,
1359 MSG_DEBUG, debug_message);
1361 primary_domain = find_our_domain();
1363 if (primary_domain == NULL) {
1364 smb_panic("no primary domain found");
1367 /* It doesn't matter if we allow cache login,
1368 * try to bring domain online after fork. */
1369 if ( child->domain ) {
1370 child->domain->startup = True;
1371 child->domain->startup_time = time(NULL);
1372 /* we can be in primary domain or in trusted domain
1373 * If we are in trusted domain, set the primary domain
1374 * in start-up mode */
1375 if (!(child->domain->internal)) {
1376 set_domain_online_request(child->domain);
1377 if (!(child->domain->primary)) {
1378 primary_domain->startup = True;
1379 primary_domain->startup_time = time(NULL);
1380 set_domain_online_request(primary_domain);
1386 * We are in idmap child, make sure that we set the
1387 * check_online_event to bring primary domain online.
1389 if (child == idmap_child()) {
1390 set_domain_online_request(primary_domain);
1393 /* We might be in the idmap child...*/
1394 if (child->domain && !(child->domain->internal) &&
1395 lp_winbind_offline_logon()) {
1397 set_domain_online_request(child->domain);
1399 if (primary_domain && (primary_domain != child->domain)) {
1400 /* We need to talk to the primary
1401 * domain as well as the trusted
1402 * domain inside a trusted domain
1403 * child.
1404 * See the code in :
1405 * set_dc_type_and_flags_trustinfo()
1406 * for details.
1408 set_domain_online_request(primary_domain);
1411 child->lockout_policy_event = event_add_timed(
1412 winbind_event_context(), NULL, timeval_zero(),
1413 account_lockout_policy_handler,
1414 child);
1417 if (child->domain && child->domain->primary &&
1418 !USE_KERBEROS_KEYTAB &&
1419 lp_server_role() == ROLE_DOMAIN_MEMBER) {
1421 struct timeval next_change;
1423 if (calculate_next_machine_pwd_change(child->domain->name,
1424 &next_change)) {
1425 child->machine_password_change_event = event_add_timed(
1426 winbind_event_context(), NULL, next_change,
1427 machine_password_change_handler,
1428 child);
1432 while (1) {
1434 int ret;
1435 fd_set r_fds;
1436 fd_set w_fds;
1437 int maxfd;
1438 struct timeval t;
1439 struct timeval *tp;
1440 struct timeval now;
1441 TALLOC_CTX *frame = talloc_stackframe();
1442 struct iovec iov[2];
1443 int iov_count;
1444 NTSTATUS status;
1446 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1447 TALLOC_FREE(frame);
1448 continue;
1451 GetTimeOfDay(&now);
1453 if (child->domain && child->domain->startup &&
1454 (now.tv_sec > child->domain->startup_time + 30)) {
1455 /* No longer in "startup" mode. */
1456 DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1457 child->domain->name ));
1458 child->domain->startup = False;
1461 FD_ZERO(&r_fds);
1462 FD_ZERO(&w_fds);
1464 if (state.sock < 0 || state.sock >= FD_SETSIZE) {
1465 TALLOC_FREE(frame);
1466 perror("EBADF");
1467 _exit(1);
1470 FD_SET(state.sock, &r_fds);
1471 maxfd = state.sock;
1474 * Initialize this high as event_add_to_select_args()
1475 * uses a timeval_min() on this and next_event. Fix
1476 * from Roel van Meer <rolek@alt001.com>.
1478 t.tv_sec = 999999;
1479 t.tv_usec = 0;
1481 event_add_to_select_args(winbind_event_context(), &now,
1482 &r_fds, &w_fds, &t, &maxfd);
1483 tp = get_timed_events_timeout(winbind_event_context(), &t);
1484 if (tp) {
1485 DEBUG(11,("select will use timeout of %u.%u seconds\n",
1486 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1489 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1491 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1492 /* We got a signal - continue. */
1493 TALLOC_FREE(frame);
1494 continue;
1497 if (ret == 0) {
1498 DEBUG(11,("nothing is ready yet, continue\n"));
1499 TALLOC_FREE(frame);
1500 continue;
1503 if (ret == -1 && errno == EINTR) {
1504 /* We got a signal - continue. */
1505 TALLOC_FREE(frame);
1506 continue;
1509 if (ret == -1 && errno != EINTR) {
1510 DEBUG(0,("select error occured\n"));
1511 TALLOC_FREE(frame);
1512 perror("select");
1513 _exit(1);
1516 /* fetch a request from the main daemon */
1517 status = child_read_request(&state);
1519 if (!NT_STATUS_IS_OK(status)) {
1520 /* we lost contact with our parent */
1521 _exit(0);
1524 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1526 ZERO_STRUCTP(state.response);
1527 state.request->null_term = '\0';
1528 state.mem_ctx = frame;
1529 child_process_request(child, &state);
1531 DEBUG(4, ("Finished processing child request %d\n",
1532 (int)state.request->cmd));
1534 SAFE_FREE(state.request->extra_data.data);
1536 iov[0].iov_base = (void *)state.response;
1537 iov[0].iov_len = sizeof(struct winbindd_response);
1538 iov_count = 1;
1540 if (state.response->length > sizeof(struct winbindd_response)) {
1541 iov[1].iov_base =
1542 (void *)state.response->extra_data.data;
1543 iov[1].iov_len = state.response->length-iov[0].iov_len;
1544 iov_count = 2;
1547 DEBUG(10, ("Writing %d bytes to parent\n",
1548 (int)state.response->length));
1550 if (write_data_iov(state.sock, iov, iov_count) !=
1551 state.response->length) {
1552 DEBUG(0, ("Could not write result\n"));
1553 exit(1);
1555 TALLOC_FREE(frame);