source: trunk/server/source3/winbindd/winbindd.c@ 421

Last change on this file since 421 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 31.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Winbind daemon for ntdom nss module
5
6 Copyright (C) by Tim Potter 2000-2002
7 Copyright (C) Andrew Tridgell 2002
8 Copyright (C) Jelmer Vernooij 2003
9 Copyright (C) Volker Lendecke 2004
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
23*/
24
25#include "includes.h"
26#include "winbindd.h"
27#include "../../nsswitch/libwbclient/wbc_async.h"
28
29#undef DBGC_CLASS
30#define DBGC_CLASS DBGC_WINBIND
31
32static void remove_client(struct winbindd_cli_state *state);
33
34static bool opt_nocache = False;
35static bool interactive = False;
36
37extern bool override_logfile;
38
39struct event_context *winbind_event_context(void)
40{
41 static struct event_context *ctx;
42
43 if (!ctx && !(ctx = event_context_init(NULL))) {
44 smb_panic("Could not init winbind event context");
45 }
46 return ctx;
47}
48
49struct messaging_context *winbind_messaging_context(void)
50{
51 static struct messaging_context *ctx;
52
53 if (ctx == NULL) {
54 ctx = messaging_init(NULL, server_id_self(),
55 winbind_event_context());
56 }
57 if (ctx == NULL) {
58 DEBUG(0, ("Could not init winbind messaging context.\n"));
59 }
60 return ctx;
61}
62
63/* Reload configuration */
64
65static bool reload_services_file(const char *lfile)
66{
67 bool ret;
68
69 if (lp_loaded()) {
70 const char *fname = lp_configfile();
71
72 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
73 set_dyn_CONFIGFILE(fname);
74 }
75 }
76
77 /* if this is a child, restore the logfile to the special
78 name - <domain>, idmap, etc. */
79 if (lfile && *lfile) {
80 lp_set_logfile(lfile);
81 }
82
83 reopen_logs();
84 ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
85
86 reopen_logs();
87 load_interfaces();
88
89 return(ret);
90}
91
92
93/**************************************************************************** **
94 Handle a fault..
95 **************************************************************************** */
96
97static void fault_quit(void)
98{
99 dump_core();
100}
101
102static void winbindd_status(void)
103{
104 struct winbindd_cli_state *tmp;
105
106 DEBUG(0, ("winbindd status:\n"));
107
108 /* Print client state information */
109
110 DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
111
112 if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
113 DEBUG(2, ("\tclient list:\n"));
114 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
115 DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
116 (unsigned long)tmp->pid, tmp->sock));
117 }
118 }
119}
120
121/* Print winbindd status to log file */
122
123static void print_winbindd_status(void)
124{
125 winbindd_status();
126}
127
128/* Flush client cache */
129
130static void flush_caches(void)
131{
132 /* We need to invalidate cached user list entries on a SIGHUP
133 otherwise cached access denied errors due to restrict anonymous
134 hang around until the sequence number changes. */
135
136 if (!wcache_invalidate_cache()) {
137 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
138 if (!winbindd_cache_validate_and_initialize()) {
139 exit(1);
140 }
141 }
142}
143
144/* Handle the signal by unlinking socket and exiting */
145
146static void terminate(bool is_parent)
147{
148 if (is_parent) {
149 /* When parent goes away we should
150 * remove the socket file. Not so
151 * when children terminate.
152 */
153 char *path = NULL;
154
155 if (asprintf(&path, "%s/%s",
156 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
157 unlink(path);
158 SAFE_FREE(path);
159 }
160 }
161
162 idmap_close();
163
164 trustdom_cache_shutdown();
165
166 gencache_stabilize();
167
168#if 0
169 if (interactive) {
170 TALLOC_CTX *mem_ctx = talloc_init("end_description");
171 char *description = talloc_describe_all(mem_ctx);
172
173 DEBUG(3, ("tallocs left:\n%s\n", description));
174 talloc_destroy(mem_ctx);
175 }
176#endif
177
178 if (is_parent) {
179 pidfile_unlink();
180 }
181
182 exit(0);
183}
184
185static void winbindd_sig_term_handler(struct tevent_context *ev,
186 struct tevent_signal *se,
187 int signum,
188 int count,
189 void *siginfo,
190 void *private_data)
191{
192 bool *is_parent = talloc_get_type_abort(private_data, bool);
193
194 DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
195 signum, (int)*is_parent));
196 terminate(*is_parent);
197}
198
199bool winbindd_setup_sig_term_handler(bool parent)
200{
201 struct tevent_signal *se;
202 bool *is_parent;
203
204 is_parent = talloc(winbind_event_context(), bool);
205 if (!is_parent) {
206 return false;
207 }
208
209 *is_parent = parent;
210
211 se = tevent_add_signal(winbind_event_context(),
212 is_parent,
213 SIGTERM, 0,
214 winbindd_sig_term_handler,
215 is_parent);
216 if (!se) {
217 DEBUG(0,("failed to setup SIGTERM handler"));
218 talloc_free(is_parent);
219 return false;
220 }
221
222 se = tevent_add_signal(winbind_event_context(),
223 is_parent,
224 SIGINT, 0,
225 winbindd_sig_term_handler,
226 is_parent);
227 if (!se) {
228 DEBUG(0,("failed to setup SIGINT handler"));
229 talloc_free(is_parent);
230 return false;
231 }
232
233 se = tevent_add_signal(winbind_event_context(),
234 is_parent,
235 SIGQUIT, 0,
236 winbindd_sig_term_handler,
237 is_parent);
238 if (!se) {
239 DEBUG(0,("failed to setup SIGINT handler"));
240 talloc_free(is_parent);
241 return false;
242 }
243
244 return true;
245}
246
247static void winbindd_sig_hup_handler(struct tevent_context *ev,
248 struct tevent_signal *se,
249 int signum,
250 int count,
251 void *siginfo,
252 void *private_data)
253{
254 const char *file = (const char *)private_data;
255
256 DEBUG(1,("Reloading services after SIGHUP\n"));
257 flush_caches();
258 reload_services_file(file);
259}
260
261bool winbindd_setup_sig_hup_handler(const char *lfile)
262{
263 struct tevent_signal *se;
264 char *file = NULL;
265
266 if (lfile) {
267 file = talloc_strdup(winbind_event_context(),
268 lfile);
269 if (!file) {
270 return false;
271 }
272 }
273
274 se = tevent_add_signal(winbind_event_context(),
275 winbind_event_context(),
276 SIGHUP, 0,
277 winbindd_sig_hup_handler,
278 file);
279 if (!se) {
280 return false;
281 }
282
283 return true;
284}
285
286static void winbindd_sig_chld_handler(struct tevent_context *ev,
287 struct tevent_signal *se,
288 int signum,
289 int count,
290 void *siginfo,
291 void *private_data)
292{
293 pid_t pid;
294
295 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
296 winbind_child_died(pid);
297 }
298}
299
300static bool winbindd_setup_sig_chld_handler(void)
301{
302 struct tevent_signal *se;
303
304 se = tevent_add_signal(winbind_event_context(),
305 winbind_event_context(),
306 SIGCHLD, 0,
307 winbindd_sig_chld_handler,
308 NULL);
309 if (!se) {
310 return false;
311 }
312
313 return true;
314}
315
316static void winbindd_sig_usr2_handler(struct tevent_context *ev,
317 struct tevent_signal *se,
318 int signum,
319 int count,
320 void *siginfo,
321 void *private_data)
322{
323 print_winbindd_status();
324}
325
326static bool winbindd_setup_sig_usr2_handler(void)
327{
328 struct tevent_signal *se;
329
330 se = tevent_add_signal(winbind_event_context(),
331 winbind_event_context(),
332 SIGUSR2, 0,
333 winbindd_sig_usr2_handler,
334 NULL);
335 if (!se) {
336 return false;
337 }
338
339 return true;
340}
341
342/* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
343static void msg_reload_services(struct messaging_context *msg,
344 void *private_data,
345 uint32_t msg_type,
346 struct server_id server_id,
347 DATA_BLOB *data)
348{
349 /* Flush various caches */
350 flush_caches();
351 reload_services_file((const char *) private_data);
352}
353
354/* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
355static void msg_shutdown(struct messaging_context *msg,
356 void *private_data,
357 uint32_t msg_type,
358 struct server_id server_id,
359 DATA_BLOB *data)
360{
361 /* only the parent waits for this message */
362 DEBUG(0,("Got shutdown message\n"));
363 terminate(true);
364}
365
366
367static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
368 void *private_data,
369 uint32_t msg_type,
370 struct server_id server_id,
371 DATA_BLOB *data)
372{
373 uint8 ret;
374 pid_t child_pid;
375 struct sigaction act;
376 struct sigaction oldact;
377
378 DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
379 "message.\n"));
380
381 /*
382 * call the validation code from a child:
383 * so we don't block the main winbindd and the validation
384 * code can safely use fork/waitpid...
385 */
386 CatchChild();
387 child_pid = sys_fork();
388
389 if (child_pid == -1) {
390 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
391 strerror(errno)));
392 return;
393 }
394
395 if (child_pid != 0) {
396 /* parent */
397 DEBUG(5, ("winbind_msg_validate_cache: child created with "
398 "pid %d.\n", (int)child_pid));
399 return;
400 }
401
402 /* child */
403
404 /* install default SIGCHLD handler: validation code uses fork/waitpid */
405 ZERO_STRUCT(act);
406 act.sa_handler = SIG_DFL;
407#ifdef SA_RESTART
408 /* We *want* SIGALRM to interrupt a system call. */
409 act.sa_flags = SA_RESTART;
410#endif
411 sigemptyset(&act.sa_mask);
412 sigaddset(&act.sa_mask,SIGCHLD);
413 sigaction(SIGCHLD,&act,&oldact);
414
415 ret = (uint8)winbindd_validate_cache_nobackup();
416 DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
417 messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
418 (size_t)1);
419 _exit(0);
420}
421
422static struct winbindd_dispatch_table {
423 enum winbindd_cmd cmd;
424 void (*fn)(struct winbindd_cli_state *state);
425 const char *winbindd_cmd_name;
426} dispatch_table[] = {
427
428 /* PAM auth functions */
429
430 { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
431 { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
432 { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
433 { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
434 { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
435
436 /* Enumeration functions */
437
438 { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
439 "LIST_TRUSTDOM" },
440
441 /* Miscellaneous */
442
443 { WINBINDD_INFO, winbindd_info, "INFO" },
444 { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
445 "INTERFACE_VERSION" },
446 { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
447 { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
448 { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
449 { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
450 "WINBINDD_PRIV_PIPE_DIR" },
451
452 /* Credential cache access */
453 { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
454 { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
455
456 /* WINS functions */
457
458 { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
459 { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
460
461 /* End of list */
462
463 { WINBINDD_NUM_CMDS, NULL, "NONE" }
464};
465
466struct winbindd_async_dispatch_table {
467 enum winbindd_cmd cmd;
468 const char *cmd_name;
469 struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
470 struct tevent_context *ev,
471 struct winbindd_cli_state *cli,
472 struct winbindd_request *request);
473 NTSTATUS (*recv_req)(struct tevent_req *req,
474 struct winbindd_response *presp);
475};
476
477static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
478 { WINBINDD_PING, "PING",
479 wb_ping_send, wb_ping_recv },
480 { WINBINDD_LOOKUPSID, "LOOKUPSID",
481 winbindd_lookupsid_send, winbindd_lookupsid_recv },
482 { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
483 winbindd_lookupname_send, winbindd_lookupname_recv },
484 { WINBINDD_SID_TO_UID, "SID_TO_UID",
485 winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
486 { WINBINDD_SID_TO_GID, "SID_TO_GID",
487 winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
488 { WINBINDD_UID_TO_SID, "UID_TO_SID",
489 winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
490 { WINBINDD_GID_TO_SID, "GID_TO_SID",
491 winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
492 { WINBINDD_GETPWSID, "GETPWSID",
493 winbindd_getpwsid_send, winbindd_getpwsid_recv },
494 { WINBINDD_GETPWNAM, "GETPWNAM",
495 winbindd_getpwnam_send, winbindd_getpwnam_recv },
496 { WINBINDD_GETPWUID, "GETPWUID",
497 winbindd_getpwuid_send, winbindd_getpwuid_recv },
498 { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
499 winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
500 { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
501 winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
502 { WINBINDD_GETGROUPS, "GETGROUPS",
503 winbindd_getgroups_send, winbindd_getgroups_recv },
504 { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
505 winbindd_show_sequence_send, winbindd_show_sequence_recv },
506 { WINBINDD_GETGRGID, "GETGRGID",
507 winbindd_getgrgid_send, winbindd_getgrgid_recv },
508 { WINBINDD_GETGRNAM, "GETGRNAM",
509 winbindd_getgrnam_send, winbindd_getgrnam_recv },
510 { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
511 winbindd_getusersids_send, winbindd_getusersids_recv },
512 { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
513 winbindd_lookuprids_send, winbindd_lookuprids_recv },
514 { WINBINDD_SETPWENT, "SETPWENT",
515 winbindd_setpwent_send, winbindd_setpwent_recv },
516 { WINBINDD_GETPWENT, "GETPWENT",
517 winbindd_getpwent_send, winbindd_getpwent_recv },
518 { WINBINDD_ENDPWENT, "ENDPWENT",
519 winbindd_endpwent_send, winbindd_endpwent_recv },
520 { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
521 winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
522 { WINBINDD_GETDCNAME, "GETDCNAME",
523 winbindd_getdcname_send, winbindd_getdcname_recv },
524 { WINBINDD_SETGRENT, "SETGRENT",
525 winbindd_setgrent_send, winbindd_setgrent_recv },
526 { WINBINDD_GETGRENT, "GETGRENT",
527 winbindd_getgrent_send, winbindd_getgrent_recv },
528 { WINBINDD_ENDGRENT, "ENDGRENT",
529 winbindd_endgrent_send, winbindd_endgrent_recv },
530 { WINBINDD_LIST_USERS, "LIST_USERS",
531 winbindd_list_users_send, winbindd_list_users_recv },
532 { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
533 winbindd_list_groups_send, winbindd_list_groups_recv },
534 { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
535 winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
536 { WINBINDD_PING_DC, "PING_DC",
537 winbindd_ping_dc_send, winbindd_ping_dc_recv },
538
539 { 0, NULL, NULL, NULL }
540};
541
542static struct winbindd_async_dispatch_table async_priv_table[] = {
543 { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
544 winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
545 { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
546 winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
547 { WINBINDD_SET_MAPPING, "SET_MAPPING",
548 winbindd_set_mapping_send, winbindd_set_mapping_recv },
549 { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
550 winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
551 { WINBINDD_SET_HWM, "SET_HWM",
552 winbindd_set_hwm_send, winbindd_set_hwm_recv },
553 { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
554 winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
555
556 { 0, NULL, NULL, NULL }
557};
558
559static void wb_request_done(struct tevent_req *req);
560
561static void process_request(struct winbindd_cli_state *state)
562{
563 struct winbindd_dispatch_table *table = dispatch_table;
564 struct winbindd_async_dispatch_table *atable;
565
566 state->mem_ctx = talloc_init("winbind request");
567 if (state->mem_ctx == NULL)
568 return;
569
570 /* Remember who asked us. */
571 state->pid = state->request->pid;
572
573 /* Process command */
574
575 for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
576 if (state->request->cmd == atable->cmd) {
577 break;
578 }
579 }
580
581 if ((atable->send_req == NULL) && state->privileged) {
582 for (atable = async_priv_table; atable->send_req;
583 atable += 1) {
584 if (state->request->cmd == atable->cmd) {
585 break;
586 }
587 }
588 }
589
590 if (atable->send_req != NULL) {
591 struct tevent_req *req;
592
593 DEBUG(10, ("process_request: Handling async request %s\n",
594 atable->cmd_name));
595
596 req = atable->send_req(state->mem_ctx, winbind_event_context(),
597 state, state->request);
598 if (req == NULL) {
599 DEBUG(0, ("process_request: atable->send failed for "
600 "%s\n", atable->cmd_name));
601 request_error(state);
602 return;
603 }
604 tevent_req_set_callback(req, wb_request_done, state);
605 state->recv_fn = atable->recv_req;
606 return;
607 }
608
609 state->response = talloc_zero(state->mem_ctx,
610 struct winbindd_response);
611 if (state->response == NULL) {
612 DEBUG(10, ("talloc failed\n"));
613 remove_client(state);
614 return;
615 }
616 state->response->result = WINBINDD_PENDING;
617 state->response->length = sizeof(struct winbindd_response);
618
619 for (table = dispatch_table; table->fn; table++) {
620 if (state->request->cmd == table->cmd) {
621 DEBUG(10,("process_request: request fn %s\n",
622 table->winbindd_cmd_name ));
623 table->fn(state);
624 break;
625 }
626 }
627
628 if (!table->fn) {
629 DEBUG(10,("process_request: unknown request fn number %d\n",
630 (int)state->request->cmd ));
631 request_error(state);
632 }
633}
634
635static void wb_request_done(struct tevent_req *req)
636{
637 struct winbindd_cli_state *state = tevent_req_callback_data(
638 req, struct winbindd_cli_state);
639 NTSTATUS status;
640
641 state->response = talloc_zero(state, struct winbindd_response);
642 if (state->response == NULL) {
643 remove_client(state);
644 return;
645 }
646 state->response->result = WINBINDD_PENDING;
647 state->response->length = sizeof(struct winbindd_response);
648
649 status = state->recv_fn(req, state->response);
650 TALLOC_FREE(req);
651 if (!NT_STATUS_IS_OK(status)) {
652 DEBUG(10, ("returning %s\n", nt_errstr(status)));
653 request_error(state);
654 return;
655 }
656 request_ok(state);
657}
658
659/*
660 * This is the main event loop of winbind requests. It goes through a
661 * state-machine of 3 read/write requests, 4 if you have extra data to send.
662 *
663 * An idle winbind client has a read request of 4 bytes outstanding,
664 * finalizing function is request_len_recv, checking the length. request_recv
665 * then processes the packet. The processing function then at some point has
666 * to call request_finished which schedules sending the response.
667 */
668
669static void request_finished(struct winbindd_cli_state *state);
670
671static void winbind_client_request_read(struct tevent_req *req);
672static void winbind_client_response_written(struct tevent_req *req);
673
674static void request_finished(struct winbindd_cli_state *state)
675{
676 struct tevent_req *req;
677
678 TALLOC_FREE(state->request);
679
680 req = wb_resp_write_send(state, winbind_event_context(),
681 state->out_queue, state->sock,
682 state->response);
683 if (req == NULL) {
684 remove_client(state);
685 return;
686 }
687 tevent_req_set_callback(req, winbind_client_response_written, state);
688}
689
690static void winbind_client_response_written(struct tevent_req *req)
691{
692 struct winbindd_cli_state *state = tevent_req_callback_data(
693 req, struct winbindd_cli_state);
694 ssize_t ret;
695 int err;
696
697 ret = wb_resp_write_recv(req, &err);
698 TALLOC_FREE(req);
699 if (ret == -1) {
700 close(state->sock);
701 state->sock = -1;
702 DEBUG(2, ("Could not write response to client: %s\n",
703 strerror(err)));
704 remove_client(state);
705 return;
706 }
707
708 TALLOC_FREE(state->mem_ctx);
709 state->response = NULL;
710
711 req = wb_req_read_send(state, winbind_event_context(), state->sock,
712 WINBINDD_MAX_EXTRA_DATA);
713 if (req == NULL) {
714 remove_client(state);
715 return;
716 }
717 tevent_req_set_callback(req, winbind_client_request_read, state);
718}
719
720void request_error(struct winbindd_cli_state *state)
721{
722 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
723 state->response->result = WINBINDD_ERROR;
724 request_finished(state);
725}
726
727void request_ok(struct winbindd_cli_state *state)
728{
729 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
730 state->response->result = WINBINDD_OK;
731 request_finished(state);
732}
733
734/* Process a new connection by adding it to the client connection list */
735
736static void new_connection(int listen_sock, bool privileged)
737{
738 struct sockaddr_un sunaddr;
739 struct winbindd_cli_state *state;
740 struct tevent_req *req;
741 socklen_t len;
742 int sock;
743
744 /* Accept connection */
745
746 len = sizeof(sunaddr);
747
748 do {
749 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
750 &len);
751 } while (sock == -1 && errno == EINTR);
752
753 if (sock == -1)
754 return;
755
756 DEBUG(6,("accepted socket %d\n", sock));
757
758 /* Create new connection structure */
759
760 if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
761 close(sock);
762 return;
763 }
764
765 state->sock = sock;
766
767 state->out_queue = tevent_queue_create(state, "winbind client reply");
768 if (state->out_queue == NULL) {
769 close(sock);
770 TALLOC_FREE(state);
771 return;
772 }
773
774 state->last_access = time(NULL);
775
776 state->privileged = privileged;
777
778 req = wb_req_read_send(state, winbind_event_context(), state->sock,
779 WINBINDD_MAX_EXTRA_DATA);
780 if (req == NULL) {
781 TALLOC_FREE(state);
782 close(sock);
783 return;
784 }
785 tevent_req_set_callback(req, winbind_client_request_read, state);
786
787 /* Add to connection list */
788
789 winbindd_add_client(state);
790}
791
792static void winbind_client_request_read(struct tevent_req *req)
793{
794 struct winbindd_cli_state *state = tevent_req_callback_data(
795 req, struct winbindd_cli_state);
796 ssize_t ret;
797 int err;
798
799 ret = wb_req_read_recv(req, state, &state->request, &err);
800 TALLOC_FREE(req);
801 if (ret == -1) {
802 if (err == EPIPE) {
803 DEBUG(6, ("closing socket %d, client exited\n",
804 state->sock));
805 } else {
806 DEBUG(2, ("Could not read client request from fd %d: "
807 "%s\n", state->sock, strerror(err)));
808 }
809 close(state->sock);
810 state->sock = -1;
811 remove_client(state);
812 return;
813 }
814 process_request(state);
815}
816
817/* Remove a client connection from client connection list */
818
819static void remove_client(struct winbindd_cli_state *state)
820{
821 char c = 0;
822 int nwritten;
823
824 /* It's a dead client - hold a funeral */
825
826 if (state == NULL) {
827 return;
828 }
829
830 if (state->sock != -1) {
831 /* tell client, we are closing ... */
832 nwritten = write(state->sock, &c, sizeof(c));
833 if (nwritten == -1) {
834 DEBUG(2, ("final write to client failed: %s\n",
835 strerror(errno)));
836 }
837
838 /* Close socket */
839
840 close(state->sock);
841 state->sock = -1;
842 }
843
844 TALLOC_FREE(state->mem_ctx);
845
846 /* Remove from list and free */
847
848 winbindd_remove_client(state);
849 TALLOC_FREE(state);
850}
851
852/* Shutdown client connection which has been idle for the longest time */
853
854static bool remove_idle_client(void)
855{
856 struct winbindd_cli_state *state, *remove_state = NULL;
857 time_t last_access = 0;
858 int nidle = 0;
859
860 for (state = winbindd_client_list(); state; state = state->next) {
861 if (state->response == NULL &&
862 !state->pwent_state && !state->grent_state) {
863 nidle++;
864 if (!last_access || state->last_access < last_access) {
865 last_access = state->last_access;
866 remove_state = state;
867 }
868 }
869 }
870
871 if (remove_state) {
872 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
873 nidle, remove_state->sock, (unsigned int)remove_state->pid));
874 remove_client(remove_state);
875 return True;
876 }
877
878 return False;
879}
880
881struct winbindd_listen_state {
882 bool privileged;
883 int fd;
884};
885
886static void winbindd_listen_fde_handler(struct tevent_context *ev,
887 struct tevent_fd *fde,
888 uint16_t flags,
889 void *private_data)
890{
891 struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
892 struct winbindd_listen_state);
893
894 while (winbindd_num_clients() >
895 WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
896 DEBUG(5,("winbindd: Exceeding %d client "
897 "connections, removing idle "
898 "connection.\n",
899 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
900 if (!remove_idle_client()) {
901 DEBUG(0,("winbindd: Exceeding %d "
902 "client connections, no idle "
903 "connection found\n",
904 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
905 break;
906 }
907 }
908 new_connection(s->fd, s->privileged);
909}
910
911static bool winbindd_setup_listeners(void)
912{
913 struct winbindd_listen_state *pub_state = NULL;
914 struct winbindd_listen_state *priv_state = NULL;
915 struct tevent_fd *fde;
916
917 pub_state = talloc(winbind_event_context(),
918 struct winbindd_listen_state);
919 if (!pub_state) {
920 goto failed;
921 }
922
923 pub_state->privileged = false;
924 pub_state->fd = open_winbindd_socket();
925 if (pub_state->fd == -1) {
926 goto failed;
927 }
928
929 fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
930 TEVENT_FD_READ, winbindd_listen_fde_handler,
931 pub_state);
932 if (fde == NULL) {
933 close(pub_state->fd);
934 goto failed;
935 }
936 tevent_fd_set_auto_close(fde);
937
938 priv_state = talloc(winbind_event_context(),
939 struct winbindd_listen_state);
940 if (!priv_state) {
941 goto failed;
942 }
943
944 priv_state->privileged = true;
945 priv_state->fd = open_winbindd_priv_socket();
946 if (priv_state->fd == -1) {
947 goto failed;
948 }
949
950 fde = tevent_add_fd(winbind_event_context(), priv_state,
951 priv_state->fd, TEVENT_FD_READ,
952 winbindd_listen_fde_handler, priv_state);
953 if (fde == NULL) {
954 close(priv_state->fd);
955 goto failed;
956 }
957 tevent_fd_set_auto_close(fde);
958
959 return true;
960failed:
961 TALLOC_FREE(pub_state);
962 TALLOC_FREE(priv_state);
963 return false;
964}
965
966bool winbindd_use_idmap_cache(void)
967{
968 return !opt_nocache;
969}
970
971bool winbindd_use_cache(void)
972{
973 return !opt_nocache;
974}
975
976/* Main function */
977
978int main(int argc, char **argv, char **envp)
979{
980 static bool is_daemon = False;
981 static bool Fork = True;
982 static bool log_stdout = False;
983 static bool no_process_group = False;
984 enum {
985 OPT_DAEMON = 1000,
986 OPT_FORK,
987 OPT_NO_PROCESS_GROUP,
988 OPT_LOG_STDOUT
989 };
990 struct poptOption long_options[] = {
991 POPT_AUTOHELP
992 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
993 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
994 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
995 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
996 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
997 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
998 POPT_COMMON_SAMBA
999 POPT_TABLEEND
1000 };
1001 poptContext pc;
1002 int opt;
1003 TALLOC_CTX *frame = talloc_stackframe();
1004 struct tevent_timer *te;
1005
1006 /* glibc (?) likes to print "User defined signal 1" and exit if a
1007 SIGUSR[12] is received before a handler is installed */
1008
1009 CatchSignal(SIGUSR1, SIG_IGN);
1010 CatchSignal(SIGUSR2, SIG_IGN);
1011
1012 fault_setup((void (*)(void *))fault_quit );
1013 dump_core_setup("winbindd");
1014
1015 load_case_tables();
1016
1017 /* Initialise for running in non-root mode */
1018
1019 sec_init();
1020
1021 set_remote_machine_name("winbindd", False);
1022
1023 /* Set environment variable so we don't recursively call ourselves.
1024 This may also be useful interactively. */
1025
1026 if ( !winbind_off() ) {
1027 DEBUG(0,("Failed to disable recusive winbindd calls. Exiting.\n"));
1028 exit(1);
1029 }
1030
1031 /* Initialise samba/rpc client stuff */
1032
1033 pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1034
1035 while ((opt = poptGetNextOpt(pc)) != -1) {
1036 switch (opt) {
1037 /* Don't become a daemon */
1038 case OPT_DAEMON:
1039 is_daemon = True;
1040 break;
1041 case 'i':
1042 interactive = True;
1043 log_stdout = True;
1044 Fork = False;
1045 break;
1046 case OPT_FORK:
1047 Fork = false;
1048 break;
1049 case OPT_NO_PROCESS_GROUP:
1050 no_process_group = true;
1051 break;
1052 case OPT_LOG_STDOUT:
1053 log_stdout = true;
1054 break;
1055 case 'n':
1056 opt_nocache = true;
1057 break;
1058 default:
1059 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1060 poptBadOption(pc, 0), poptStrerror(opt));
1061 poptPrintUsage(pc, stderr, 0);
1062 exit(1);
1063 }
1064 }
1065
1066 if (is_daemon && interactive) {
1067 d_fprintf(stderr,"\nERROR: "
1068 "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1069 poptPrintUsage(pc, stderr, 0);
1070 exit(1);
1071 }
1072
1073 if (log_stdout && Fork) {
1074 d_fprintf(stderr, "\nERROR: "
1075 "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1076 poptPrintUsage(pc, stderr, 0);
1077 exit(1);
1078 }
1079
1080 poptFreeContext(pc);
1081
1082 if (!override_logfile) {
1083 char *lfile = NULL;
1084 if (asprintf(&lfile,"%s/log.winbindd",
1085 get_dyn_LOGFILEBASE()) > 0) {
1086 lp_set_logfile(lfile);
1087 SAFE_FREE(lfile);
1088 }
1089 }
1090 setup_logging("winbindd", log_stdout);
1091 reopen_logs();
1092
1093 DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1094 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1095
1096 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1097 DEBUG(0, ("error opening config file\n"));
1098 exit(1);
1099 }
1100
1101 /* Initialise messaging system */
1102
1103 if (winbind_messaging_context() == NULL) {
1104 exit(1);
1105 }
1106
1107 if (!reload_services_file(NULL)) {
1108 DEBUG(0, ("error opening config file\n"));
1109 exit(1);
1110 }
1111
1112 if (!directory_exist(lp_lockdir())) {
1113 mkdir(lp_lockdir(), 0755);
1114 }
1115
1116 /* Setup names. */
1117
1118 if (!init_names())
1119 exit(1);
1120
1121 load_interfaces();
1122
1123 if (!secrets_init()) {
1124
1125 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1126 return False;
1127 }
1128
1129 /* Enable netbios namecache */
1130
1131 namecache_enable();
1132
1133 /* Unblock all signals we are interested in as they may have been
1134 blocked by the parent process. */
1135
1136 BlockSignals(False, SIGINT);
1137 BlockSignals(False, SIGQUIT);
1138 BlockSignals(False, SIGTERM);
1139 BlockSignals(False, SIGUSR1);
1140 BlockSignals(False, SIGUSR2);
1141 BlockSignals(False, SIGHUP);
1142 BlockSignals(False, SIGCHLD);
1143
1144 if (!interactive)
1145 become_daemon(Fork, no_process_group);
1146
1147 pidfile_create("winbindd");
1148
1149#if HAVE_SETPGID
1150 /*
1151 * If we're interactive we want to set our own process group for
1152 * signal management.
1153 */
1154 if (interactive && !no_process_group)
1155 setpgid( (pid_t)0, (pid_t)0);
1156#endif
1157
1158 TimeInit();
1159
1160 /* Don't use winbindd_reinit_after_fork here as
1161 * we're just starting up and haven't created any
1162 * winbindd-specific resources we must free yet. JRA.
1163 */
1164
1165 if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1166 winbind_event_context(),
1167 false))) {
1168 DEBUG(0,("reinit_after_fork() failed\n"));
1169 exit(1);
1170 }
1171
1172 /* Setup signal handlers */
1173
1174 if (!winbindd_setup_sig_term_handler(true))
1175 exit(1);
1176 if (!winbindd_setup_sig_hup_handler(NULL))
1177 exit(1);
1178 if (!winbindd_setup_sig_chld_handler())
1179 exit(1);
1180 if (!winbindd_setup_sig_usr2_handler())
1181 exit(1);
1182
1183 CatchSignal(SIGPIPE, SIG_IGN); /* Ignore sigpipe */
1184
1185 /*
1186 * Ensure all cache and idmap caches are consistent
1187 * and initialized before we startup.
1188 */
1189 if (!winbindd_cache_validate_and_initialize()) {
1190 exit(1);
1191 }
1192
1193 /* get broadcast messages */
1194 claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1195
1196 /* React on 'smbcontrol winbindd reload-config' in the same way
1197 as to SIGHUP signal */
1198 messaging_register(winbind_messaging_context(), NULL,
1199 MSG_SMB_CONF_UPDATED, msg_reload_services);
1200 messaging_register(winbind_messaging_context(), NULL,
1201 MSG_SHUTDOWN, msg_shutdown);
1202
1203 /* Handle online/offline messages. */
1204 messaging_register(winbind_messaging_context(), NULL,
1205 MSG_WINBIND_OFFLINE, winbind_msg_offline);
1206 messaging_register(winbind_messaging_context(), NULL,
1207 MSG_WINBIND_ONLINE, winbind_msg_online);
1208 messaging_register(winbind_messaging_context(), NULL,
1209 MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1210
1211 messaging_register(winbind_messaging_context(), NULL,
1212 MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1213
1214 messaging_register(winbind_messaging_context(), NULL,
1215 MSG_WINBIND_VALIDATE_CACHE,
1216 winbind_msg_validate_cache);
1217
1218 messaging_register(winbind_messaging_context(), NULL,
1219 MSG_WINBIND_DUMP_DOMAIN_LIST,
1220 winbind_msg_dump_domain_list);
1221
1222 /* Register handler for MSG_DEBUG. */
1223 messaging_register(winbind_messaging_context(), NULL,
1224 MSG_DEBUG,
1225 winbind_msg_debug);
1226
1227 netsamlogon_cache_init(); /* Non-critical */
1228
1229 /* clear the cached list of trusted domains */
1230
1231 wcache_tdc_clear();
1232
1233 if (!init_domain_list()) {
1234 DEBUG(0,("unable to initialize domain list\n"));
1235 exit(1);
1236 }
1237
1238 init_idmap_child();
1239 init_locator_child();
1240
1241 smb_nscd_flush_user_cache();
1242 smb_nscd_flush_group_cache();
1243
1244 /* setup listen sockets */
1245
1246 if (!winbindd_setup_listeners()) {
1247 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1248 exit(1);
1249 }
1250
1251 te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1252 rescan_trusted_domains, NULL);
1253 if (te == NULL) {
1254 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1255 exit(1);
1256 }
1257
1258 TALLOC_FREE(frame);
1259 /* Loop waiting for requests */
1260 while (1) {
1261 frame = talloc_stackframe();
1262
1263 if (tevent_loop_once(winbind_event_context()) == -1) {
1264 DEBUG(1, ("tevent_loop_once() failed: %s\n",
1265 strerror(errno)));
1266 return 1;
1267 }
1268
1269 TALLOC_FREE(frame);
1270 }
1271
1272 return 0;
1273}
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