source: branches/samba-3.5.x/source3/winbindd/winbindd.c

Last change on this file was 778, checked in by Silvan Scherrer, 12 years ago

Samba 3.5: add a maintained message
File size: 34.0 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 char *fname = lp_configfile();
71
72 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
73 set_dyn_CONFIGFILE(fname);
74 }
75 TALLOC_FREE(fname);
76 }
77
78 /* if this is a child, restore the logfile to the special
79 name - <domain>, idmap, etc. */
80 if (lfile && *lfile) {
81 lp_set_logfile(lfile);
82 }
83
84 reopen_logs();
85 ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
86
87 reopen_logs();
88 load_interfaces();
89
90 return(ret);
91}
92
93
94/**************************************************************************** **
95 Handle a fault..
96 **************************************************************************** */
97
98static void fault_quit(void)
99{
100 dump_core();
101}
102
103static void winbindd_status(void)
104{
105 struct winbindd_cli_state *tmp;
106
107 DEBUG(0, ("winbindd status:\n"));
108
109 /* Print client state information */
110
111 DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
112
113 if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
114 DEBUG(2, ("\tclient list:\n"));
115 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
116 DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
117 (unsigned long)tmp->pid, tmp->sock));
118 }
119 }
120}
121
122/* Print winbindd status to log file */
123
124static void print_winbindd_status(void)
125{
126 winbindd_status();
127}
128
129/* Flush client cache */
130
131static void flush_caches(void)
132{
133 /* We need to invalidate cached user list entries on a SIGHUP
134 otherwise cached access denied errors due to restrict anonymous
135 hang around until the sequence number changes. */
136
137 if (!wcache_invalidate_cache()) {
138 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
139 if (!winbindd_cache_validate_and_initialize()) {
140 exit(1);
141 }
142 }
143}
144
145/* Handle the signal by unlinking socket and exiting */
146
147static void terminate(bool is_parent)
148{
149 if (is_parent) {
150 /* When parent goes away we should
151 * remove the socket file. Not so
152 * when children terminate.
153 */
154 char *path = NULL;
155
156 if (asprintf(&path, "%s/%s",
157 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
158 unlink(path);
159 SAFE_FREE(path);
160 }
161 }
162
163 idmap_close();
164
165 trustdom_cache_shutdown();
166
167 gencache_stabilize();
168
169#if 0
170 if (interactive) {
171 TALLOC_CTX *mem_ctx = talloc_init("end_description");
172 char *description = talloc_describe_all(mem_ctx);
173
174 DEBUG(3, ("tallocs left:\n%s\n", description));
175 talloc_destroy(mem_ctx);
176 }
177#endif
178
179 if (is_parent) {
180 pidfile_unlink();
181 }
182
183 exit(0);
184}
185
186static void winbindd_sig_term_handler(struct tevent_context *ev,
187 struct tevent_signal *se,
188 int signum,
189 int count,
190 void *siginfo,
191 void *private_data)
192{
193 bool *is_parent = talloc_get_type_abort(private_data, bool);
194
195 DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
196 signum, (int)*is_parent));
197 terminate(*is_parent);
198}
199
200bool winbindd_setup_sig_term_handler(bool parent)
201{
202 struct tevent_signal *se;
203 bool *is_parent;
204
205 is_parent = talloc(winbind_event_context(), bool);
206 if (!is_parent) {
207 return false;
208 }
209
210 *is_parent = parent;
211
212 se = tevent_add_signal(winbind_event_context(),
213 is_parent,
214 SIGTERM, 0,
215 winbindd_sig_term_handler,
216 is_parent);
217 if (!se) {
218 DEBUG(0,("failed to setup SIGTERM handler"));
219 talloc_free(is_parent);
220 return false;
221 }
222
223 se = tevent_add_signal(winbind_event_context(),
224 is_parent,
225 SIGINT, 0,
226 winbindd_sig_term_handler,
227 is_parent);
228 if (!se) {
229 DEBUG(0,("failed to setup SIGINT handler"));
230 talloc_free(is_parent);
231 return false;
232 }
233
234 se = tevent_add_signal(winbind_event_context(),
235 is_parent,
236 SIGQUIT, 0,
237 winbindd_sig_term_handler,
238 is_parent);
239 if (!se) {
240 DEBUG(0,("failed to setup SIGINT handler"));
241 talloc_free(is_parent);
242 return false;
243 }
244
245 return true;
246}
247
248static void winbindd_sig_hup_handler(struct tevent_context *ev,
249 struct tevent_signal *se,
250 int signum,
251 int count,
252 void *siginfo,
253 void *private_data)
254{
255 const char *file = (const char *)private_data;
256
257 DEBUG(1,("Reloading services after SIGHUP\n"));
258 flush_caches();
259 reload_services_file(file);
260}
261
262bool winbindd_setup_sig_hup_handler(const char *lfile)
263{
264 struct tevent_signal *se;
265 char *file = NULL;
266
267 if (lfile) {
268 file = talloc_strdup(winbind_event_context(),
269 lfile);
270 if (!file) {
271 return false;
272 }
273 }
274
275 se = tevent_add_signal(winbind_event_context(),
276 winbind_event_context(),
277 SIGHUP, 0,
278 winbindd_sig_hup_handler,
279 file);
280 if (!se) {
281 return false;
282 }
283
284 return true;
285}
286
287static void winbindd_sig_chld_handler(struct tevent_context *ev,
288 struct tevent_signal *se,
289 int signum,
290 int count,
291 void *siginfo,
292 void *private_data)
293{
294 pid_t pid;
295
296 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
297 winbind_child_died(pid);
298 }
299}
300
301static bool winbindd_setup_sig_chld_handler(void)
302{
303 struct tevent_signal *se;
304
305 se = tevent_add_signal(winbind_event_context(),
306 winbind_event_context(),
307 SIGCHLD, 0,
308 winbindd_sig_chld_handler,
309 NULL);
310 if (!se) {
311 return false;
312 }
313
314 return true;
315}
316
317static void winbindd_sig_usr2_handler(struct tevent_context *ev,
318 struct tevent_signal *se,
319 int signum,
320 int count,
321 void *siginfo,
322 void *private_data)
323{
324 print_winbindd_status();
325}
326
327static bool winbindd_setup_sig_usr2_handler(void)
328{
329 struct tevent_signal *se;
330
331 se = tevent_add_signal(winbind_event_context(),
332 winbind_event_context(),
333 SIGUSR2, 0,
334 winbindd_sig_usr2_handler,
335 NULL);
336 if (!se) {
337 return false;
338 }
339
340 return true;
341}
342
343/* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
344static void msg_reload_services(struct messaging_context *msg,
345 void *private_data,
346 uint32_t msg_type,
347 struct server_id server_id,
348 DATA_BLOB *data)
349{
350 /* Flush various caches */
351 flush_caches();
352 reload_services_file((const char *) private_data);
353}
354
355/* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
356static void msg_shutdown(struct messaging_context *msg,
357 void *private_data,
358 uint32_t msg_type,
359 struct server_id server_id,
360 DATA_BLOB *data)
361{
362 /* only the parent waits for this message */
363 DEBUG(0,("Got shutdown message\n"));
364 terminate(true);
365}
366
367
368static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
369 void *private_data,
370 uint32_t msg_type,
371 struct server_id server_id,
372 DATA_BLOB *data)
373{
374 uint8 ret;
375 pid_t child_pid;
376
377 DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
378 "message.\n"));
379
380 /*
381 * call the validation code from a child:
382 * so we don't block the main winbindd and the validation
383 * code can safely use fork/waitpid...
384 */
385 child_pid = sys_fork();
386
387 if (child_pid == -1) {
388 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
389 strerror(errno)));
390 return;
391 }
392
393 if (child_pid != 0) {
394 /* parent */
395 DEBUG(5, ("winbind_msg_validate_cache: child created with "
396 "pid %d.\n", (int)child_pid));
397 return;
398 }
399
400 /* child */
401
402 if (!winbindd_reinit_after_fork(NULL)) {
403 _exit(0);
404 }
405
406 /* install default SIGCHLD handler: validation code uses fork/waitpid */
407 CatchSignal(SIGCHLD, SIG_DFL);
408
409 ret = (uint8)winbindd_validate_cache_nobackup();
410 DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
411 messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
412 (size_t)1);
413 _exit(0);
414}
415
416static struct winbindd_dispatch_table {
417 enum winbindd_cmd cmd;
418 void (*fn)(struct winbindd_cli_state *state);
419 const char *winbindd_cmd_name;
420} dispatch_table[] = {
421
422 /* PAM auth functions */
423
424 { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
425 { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
426 { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
427 { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
428 { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
429
430 /* Enumeration functions */
431
432 { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
433 "LIST_TRUSTDOM" },
434
435 /* Miscellaneous */
436
437 { WINBINDD_INFO, winbindd_info, "INFO" },
438 { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
439 "INTERFACE_VERSION" },
440 { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
441 { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
442 { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
443 { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
444 "WINBINDD_PRIV_PIPE_DIR" },
445
446 /* Credential cache access */
447 { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
448 { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
449
450 /* WINS functions */
451
452 { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
453 { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
454
455 /* End of list */
456
457 { WINBINDD_NUM_CMDS, NULL, "NONE" }
458};
459
460struct winbindd_async_dispatch_table {
461 enum winbindd_cmd cmd;
462 const char *cmd_name;
463 struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
464 struct tevent_context *ev,
465 struct winbindd_cli_state *cli,
466 struct winbindd_request *request);
467 NTSTATUS (*recv_req)(struct tevent_req *req,
468 struct winbindd_response *presp);
469};
470
471static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
472 { WINBINDD_PING, "PING",
473 wb_ping_send, wb_ping_recv },
474 { WINBINDD_LOOKUPSID, "LOOKUPSID",
475 winbindd_lookupsid_send, winbindd_lookupsid_recv },
476 { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
477 winbindd_lookupname_send, winbindd_lookupname_recv },
478 { WINBINDD_SID_TO_UID, "SID_TO_UID",
479 winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
480 { WINBINDD_SID_TO_GID, "SID_TO_GID",
481 winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
482 { WINBINDD_UID_TO_SID, "UID_TO_SID",
483 winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
484 { WINBINDD_GID_TO_SID, "GID_TO_SID",
485 winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
486 { WINBINDD_GETPWSID, "GETPWSID",
487 winbindd_getpwsid_send, winbindd_getpwsid_recv },
488 { WINBINDD_GETPWNAM, "GETPWNAM",
489 winbindd_getpwnam_send, winbindd_getpwnam_recv },
490 { WINBINDD_GETPWUID, "GETPWUID",
491 winbindd_getpwuid_send, winbindd_getpwuid_recv },
492 { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
493 winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
494 { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
495 winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
496 { WINBINDD_GETGROUPS, "GETGROUPS",
497 winbindd_getgroups_send, winbindd_getgroups_recv },
498 { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
499 winbindd_show_sequence_send, winbindd_show_sequence_recv },
500 { WINBINDD_GETGRGID, "GETGRGID",
501 winbindd_getgrgid_send, winbindd_getgrgid_recv },
502 { WINBINDD_GETGRNAM, "GETGRNAM",
503 winbindd_getgrnam_send, winbindd_getgrnam_recv },
504 { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
505 winbindd_getusersids_send, winbindd_getusersids_recv },
506 { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
507 winbindd_lookuprids_send, winbindd_lookuprids_recv },
508 { WINBINDD_SETPWENT, "SETPWENT",
509 winbindd_setpwent_send, winbindd_setpwent_recv },
510 { WINBINDD_GETPWENT, "GETPWENT",
511 winbindd_getpwent_send, winbindd_getpwent_recv },
512 { WINBINDD_ENDPWENT, "ENDPWENT",
513 winbindd_endpwent_send, winbindd_endpwent_recv },
514 { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
515 winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
516 { WINBINDD_GETDCNAME, "GETDCNAME",
517 winbindd_getdcname_send, winbindd_getdcname_recv },
518 { WINBINDD_SETGRENT, "SETGRENT",
519 winbindd_setgrent_send, winbindd_setgrent_recv },
520 { WINBINDD_GETGRENT, "GETGRENT",
521 winbindd_getgrent_send, winbindd_getgrent_recv },
522 { WINBINDD_ENDGRENT, "ENDGRENT",
523 winbindd_endgrent_send, winbindd_endgrent_recv },
524 { WINBINDD_LIST_USERS, "LIST_USERS",
525 winbindd_list_users_send, winbindd_list_users_recv },
526 { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
527 winbindd_list_groups_send, winbindd_list_groups_recv },
528 { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
529 winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
530 { WINBINDD_PING_DC, "PING_DC",
531 winbindd_ping_dc_send, winbindd_ping_dc_recv },
532
533 { 0, NULL, NULL, NULL }
534};
535
536static struct winbindd_async_dispatch_table async_priv_table[] = {
537 { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
538 winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
539 { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
540 winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
541 { WINBINDD_SET_MAPPING, "SET_MAPPING",
542 winbindd_set_mapping_send, winbindd_set_mapping_recv },
543 { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
544 winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
545 { WINBINDD_SET_HWM, "SET_HWM",
546 winbindd_set_hwm_send, winbindd_set_hwm_recv },
547 { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
548 winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
549
550 { 0, NULL, NULL, NULL }
551};
552
553static void wb_request_done(struct tevent_req *req);
554
555static void process_request(struct winbindd_cli_state *state)
556{
557 struct winbindd_dispatch_table *table = dispatch_table;
558 struct winbindd_async_dispatch_table *atable;
559
560 state->mem_ctx = talloc_init("winbind request");
561 if (state->mem_ctx == NULL)
562 return;
563
564 /* Remember who asked us. */
565 state->pid = state->request->pid;
566
567 state->cmd_name = "unknown request";
568 state->recv_fn = NULL;
569 state->last_access = time(NULL);
570
571 /* Process command */
572
573 for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
574 if (state->request->cmd == atable->cmd) {
575 break;
576 }
577 }
578
579 if ((atable->send_req == NULL) && state->privileged) {
580 for (atable = async_priv_table; atable->send_req;
581 atable += 1) {
582 if (state->request->cmd == atable->cmd) {
583 break;
584 }
585 }
586 }
587
588 if (atable->send_req != NULL) {
589 struct tevent_req *req;
590
591 state->cmd_name = atable->cmd_name;
592 state->recv_fn = atable->recv_req;
593
594 DEBUG(10, ("process_request: Handling async request %d:%s\n",
595 (int)state->pid, state->cmd_name));
596
597 req = atable->send_req(state->mem_ctx, winbind_event_context(),
598 state, state->request);
599 if (req == NULL) {
600 DEBUG(0, ("process_request: atable->send failed for "
601 "%s\n", atable->cmd_name));
602 request_error(state);
603 return;
604 }
605 tevent_req_set_callback(req, wb_request_done, state);
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 state->cmd_name = table->winbindd_cmd_name;
624 table->fn(state);
625 break;
626 }
627 }
628
629 if (!table->fn) {
630 DEBUG(10,("process_request: unknown request fn number %d\n",
631 (int)state->request->cmd ));
632 request_error(state);
633 }
634}
635
636static void wb_request_done(struct tevent_req *req)
637{
638 struct winbindd_cli_state *state = tevent_req_callback_data(
639 req, struct winbindd_cli_state);
640 NTSTATUS status;
641
642 state->response = talloc_zero(state->mem_ctx,
643 struct winbindd_response);
644 if (state->response == NULL) {
645 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
646 (int)state->pid, state->cmd_name));
647 remove_client(state);
648 return;
649 }
650 state->response->result = WINBINDD_PENDING;
651 state->response->length = sizeof(struct winbindd_response);
652
653 status = state->recv_fn(req, state->response);
654 TALLOC_FREE(req);
655
656 DEBUG(10,("wb_request_done[%d:%s]: %s\n",
657 (int)state->pid, state->cmd_name, nt_errstr(status)));
658
659 if (!NT_STATUS_IS_OK(status)) {
660 request_error(state);
661 return;
662 }
663 request_ok(state);
664}
665
666/*
667 * This is the main event loop of winbind requests. It goes through a
668 * state-machine of 3 read/write requests, 4 if you have extra data to send.
669 *
670 * An idle winbind client has a read request of 4 bytes outstanding,
671 * finalizing function is request_len_recv, checking the length. request_recv
672 * then processes the packet. The processing function then at some point has
673 * to call request_finished which schedules sending the response.
674 */
675
676static void request_finished(struct winbindd_cli_state *state);
677
678static void winbind_client_request_read(struct tevent_req *req);
679static void winbind_client_response_written(struct tevent_req *req);
680
681static void request_finished(struct winbindd_cli_state *state)
682{
683 struct tevent_req *req;
684
685 TALLOC_FREE(state->request);
686
687 req = wb_resp_write_send(state, winbind_event_context(),
688 state->out_queue, state->sock,
689 state->response);
690 if (req == NULL) {
691 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
692 (int)state->pid, state->cmd_name));
693 remove_client(state);
694 return;
695 }
696 tevent_req_set_callback(req, winbind_client_response_written, state);
697}
698
699static void winbind_client_response_written(struct tevent_req *req)
700{
701 struct winbindd_cli_state *state = tevent_req_callback_data(
702 req, struct winbindd_cli_state);
703 ssize_t ret;
704 int err;
705
706 ret = wb_resp_write_recv(req, &err);
707 TALLOC_FREE(req);
708 if (ret == -1) {
709 close(state->sock);
710 state->sock = -1;
711 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
712 (int)state->pid, state->cmd_name, strerror(err)));
713 remove_client(state);
714 return;
715 }
716
717 DEBUG(10,("winbind_client_response_written[%d:%s]: deliverd response to client\n",
718 (int)state->pid, state->cmd_name));
719
720 TALLOC_FREE(state->mem_ctx);
721 state->response = NULL;
722 state->cmd_name = "no request";
723 state->recv_fn = NULL;
724
725 req = wb_req_read_send(state, winbind_event_context(), state->sock,
726 WINBINDD_MAX_EXTRA_DATA);
727 if (req == NULL) {
728 remove_client(state);
729 return;
730 }
731 tevent_req_set_callback(req, winbind_client_request_read, state);
732}
733
734void request_error(struct winbindd_cli_state *state)
735{
736 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
737 state->response->result = WINBINDD_ERROR;
738 request_finished(state);
739}
740
741void request_ok(struct winbindd_cli_state *state)
742{
743 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
744 state->response->result = WINBINDD_OK;
745 request_finished(state);
746}
747
748/* Process a new connection by adding it to the client connection list */
749
750static void new_connection(int listen_sock, bool privileged)
751{
752 struct sockaddr_un sunaddr;
753 struct winbindd_cli_state *state;
754 struct tevent_req *req;
755 socklen_t len;
756 int sock;
757
758 /* Accept connection */
759
760 len = sizeof(sunaddr);
761
762 do {
763 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
764 &len);
765 } while (sock == -1 && errno == EINTR);
766
767 if (sock == -1)
768 return;
769
770 DEBUG(6,("accepted socket %d\n", sock));
771
772 /* Create new connection structure */
773
774 if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
775 close(sock);
776 return;
777 }
778
779 state->sock = sock;
780
781 state->out_queue = tevent_queue_create(state, "winbind client reply");
782 if (state->out_queue == NULL) {
783 close(sock);
784 TALLOC_FREE(state);
785 return;
786 }
787
788 state->last_access = time(NULL);
789
790 state->privileged = privileged;
791
792 req = wb_req_read_send(state, winbind_event_context(), state->sock,
793 WINBINDD_MAX_EXTRA_DATA);
794 if (req == NULL) {
795 TALLOC_FREE(state);
796 close(sock);
797 return;
798 }
799 tevent_req_set_callback(req, winbind_client_request_read, state);
800
801 /* Add to connection list */
802
803 winbindd_add_client(state);
804}
805
806static void winbind_client_request_read(struct tevent_req *req)
807{
808 struct winbindd_cli_state *state = tevent_req_callback_data(
809 req, struct winbindd_cli_state);
810 ssize_t ret;
811 int err;
812
813 ret = wb_req_read_recv(req, state, &state->request, &err);
814 TALLOC_FREE(req);
815 if (ret == -1) {
816 if (err == EPIPE) {
817 DEBUG(6, ("closing socket %d, client exited\n",
818 state->sock));
819 } else {
820 DEBUG(2, ("Could not read client request from fd %d: "
821 "%s\n", state->sock, strerror(err)));
822 }
823 close(state->sock);
824 state->sock = -1;
825 remove_client(state);
826 return;
827 }
828 process_request(state);
829}
830
831/* Remove a client connection from client connection list */
832
833static void remove_client(struct winbindd_cli_state *state)
834{
835 char c = 0;
836 int nwritten;
837
838 /* It's a dead client - hold a funeral */
839
840 if (state == NULL) {
841 return;
842 }
843
844 if (state->sock != -1) {
845 /* tell client, we are closing ... */
846 nwritten = write(state->sock, &c, sizeof(c));
847 if (nwritten == -1) {
848 DEBUG(2, ("final write to client failed: %s\n",
849 strerror(errno)));
850 }
851
852 /* Close socket */
853
854 close(state->sock);
855 state->sock = -1;
856 }
857
858 TALLOC_FREE(state->mem_ctx);
859
860 /* Remove from list and free */
861
862 winbindd_remove_client(state);
863 TALLOC_FREE(state);
864}
865
866/* Shutdown client connection which has been idle for the longest time */
867
868static bool remove_idle_client(void)
869{
870 struct winbindd_cli_state *state, *remove_state = NULL;
871 time_t last_access = 0;
872 int nidle = 0;
873
874 for (state = winbindd_client_list(); state; state = state->next) {
875 if (state->request == NULL &&
876 state->response == NULL &&
877 !state->pwent_state && !state->grent_state) {
878 nidle++;
879 if (!last_access || state->last_access < last_access) {
880 last_access = state->last_access;
881 remove_state = state;
882 }
883 }
884 }
885
886 if (remove_state) {
887 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
888 nidle, remove_state->sock, (unsigned int)remove_state->pid));
889 remove_client(remove_state);
890 return True;
891 }
892
893 return False;
894}
895
896struct winbindd_listen_state {
897 bool privileged;
898 int fd;
899};
900
901static void winbindd_listen_fde_handler(struct tevent_context *ev,
902 struct tevent_fd *fde,
903 uint16_t flags,
904 void *private_data)
905{
906 struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
907 struct winbindd_listen_state);
908
909 while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
910 DEBUG(5,("winbindd: Exceeding %d client "
911 "connections, removing idle "
912 "connection.\n", lp_winbind_max_clients()));
913 if (!remove_idle_client()) {
914 DEBUG(0,("winbindd: Exceeding %d "
915 "client connections, no idle "
916 "connection found\n",
917 lp_winbind_max_clients()));
918 break;
919 }
920 }
921 new_connection(s->fd, s->privileged);
922}
923
924static bool winbindd_setup_listeners(void)
925{
926 struct winbindd_listen_state *pub_state = NULL;
927 struct winbindd_listen_state *priv_state = NULL;
928 struct tevent_fd *fde;
929
930 pub_state = talloc(winbind_event_context(),
931 struct winbindd_listen_state);
932 if (!pub_state) {
933 goto failed;
934 }
935
936 pub_state->privileged = false;
937 pub_state->fd = open_winbindd_socket();
938 if (pub_state->fd == -1) {
939 goto failed;
940 }
941
942 fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
943 TEVENT_FD_READ, winbindd_listen_fde_handler,
944 pub_state);
945 if (fde == NULL) {
946 close(pub_state->fd);
947 goto failed;
948 }
949 tevent_fd_set_auto_close(fde);
950
951 priv_state = talloc(winbind_event_context(),
952 struct winbindd_listen_state);
953 if (!priv_state) {
954 goto failed;
955 }
956
957 priv_state->privileged = true;
958 priv_state->fd = open_winbindd_priv_socket();
959 if (priv_state->fd == -1) {
960 goto failed;
961 }
962
963 fde = tevent_add_fd(winbind_event_context(), priv_state,
964 priv_state->fd, TEVENT_FD_READ,
965 winbindd_listen_fde_handler, priv_state);
966 if (fde == NULL) {
967 close(priv_state->fd);
968 goto failed;
969 }
970 tevent_fd_set_auto_close(fde);
971
972 return true;
973failed:
974 TALLOC_FREE(pub_state);
975 TALLOC_FREE(priv_state);
976 return false;
977}
978
979bool winbindd_use_idmap_cache(void)
980{
981 return !opt_nocache;
982}
983
984bool winbindd_use_cache(void)
985{
986 return !opt_nocache;
987}
988
989/* Main function */
990
991int main(int argc, char **argv, char **envp)
992{
993 static bool is_daemon = False;
994 static bool Fork = True;
995 static bool log_stdout = False;
996 static bool no_process_group = False;
997 enum {
998 OPT_DAEMON = 1000,
999 OPT_FORK,
1000 OPT_NO_PROCESS_GROUP,
1001 OPT_LOG_STDOUT
1002 };
1003 struct poptOption long_options[] = {
1004 POPT_AUTOHELP
1005 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1006 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1007 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1008 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1009 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1010 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1011 POPT_COMMON_SAMBA
1012 POPT_TABLEEND
1013 };
1014 poptContext pc;
1015 int opt;
1016 TALLOC_CTX *frame = talloc_stackframe();
1017
1018 /* glibc (?) likes to print "User defined signal 1" and exit if a
1019 SIGUSR[12] is received before a handler is installed */
1020
1021 CatchSignal(SIGUSR1, SIG_IGN);
1022 CatchSignal(SIGUSR2, SIG_IGN);
1023
1024 fault_setup((void (*)(void *))fault_quit );
1025 dump_core_setup("winbindd");
1026
1027 load_case_tables();
1028
1029 /* Initialise for running in non-root mode */
1030
1031 sec_init();
1032
1033 set_remote_machine_name("winbindd", False);
1034
1035 /* Set environment variable so we don't recursively call ourselves.
1036 This may also be useful interactively. */
1037
1038 if ( !winbind_off() ) {
1039 DEBUG(0,("Failed to disable recusive winbindd calls. Exiting.\n"));
1040 exit(1);
1041 }
1042
1043 /* Initialise samba/rpc client stuff */
1044
1045 pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1046
1047 while ((opt = poptGetNextOpt(pc)) != -1) {
1048 switch (opt) {
1049 /* Don't become a daemon */
1050 case OPT_DAEMON:
1051 is_daemon = True;
1052 break;
1053 case 'i':
1054 interactive = True;
1055 log_stdout = True;
1056 Fork = False;
1057 break;
1058 case OPT_FORK:
1059 Fork = false;
1060 break;
1061 case OPT_NO_PROCESS_GROUP:
1062 no_process_group = true;
1063 break;
1064 case OPT_LOG_STDOUT:
1065 log_stdout = true;
1066 break;
1067 case 'n':
1068 opt_nocache = true;
1069 break;
1070 default:
1071 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1072 poptBadOption(pc, 0), poptStrerror(opt));
1073 poptPrintUsage(pc, stderr, 0);
1074 exit(1);
1075 }
1076 }
1077
1078 /* We call dump_core_setup one more time because the command line can
1079 * set the log file or the log-basename and this will influence where
1080 * cores are stored. Without this call get_dyn_LOGFILEBASE will be
1081 * the default value derived from build's prefix. For EOM this value
1082 * is often not related to the path where winbindd is actually run
1083 * in production.
1084 */
1085 dump_core_setup("winbindd");
1086
1087 if (is_daemon && interactive) {
1088 d_fprintf(stderr,"\nERROR: "
1089 "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1090 poptPrintUsage(pc, stderr, 0);
1091 exit(1);
1092 }
1093
1094 if (log_stdout && Fork) {
1095 d_fprintf(stderr, "\nERROR: "
1096 "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1097 poptPrintUsage(pc, stderr, 0);
1098 exit(1);
1099 }
1100
1101 poptFreeContext(pc);
1102
1103 if (!override_logfile) {
1104 char *lfile = NULL;
1105 if (asprintf(&lfile,"%s/log.winbindd",
1106 get_dyn_LOGFILEBASE()) > 0) {
1107 lp_set_logfile(lfile);
1108 SAFE_FREE(lfile);
1109 }
1110 }
1111 setup_logging("winbindd", log_stdout);
1112 reopen_logs();
1113
1114 DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1115 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1116#ifdef __OS2__
1117 DEBUGADD(0,("%s\n", maintained_by_string()));
1118#endif
1119
1120 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1121 DEBUG(0, ("error opening config file\n"));
1122 exit(1);
1123 }
1124 /* After parsing the configuration file we setup the core path one more time
1125 * as the log file might have been set in the configuration and cores's
1126 * path is by default basename(lp_logfile()).
1127 */
1128 dump_core_setup("winbindd");
1129
1130 /* Initialise messaging system */
1131
1132 if (winbind_messaging_context() == NULL) {
1133 exit(1);
1134 }
1135
1136 if (!reload_services_file(NULL)) {
1137 DEBUG(0, ("error opening config file\n"));
1138 exit(1);
1139 }
1140
1141 if (!directory_exist(lp_lockdir())) {
1142 mkdir(lp_lockdir(), 0755);
1143 }
1144
1145 /* Setup names. */
1146
1147 if (!init_names())
1148 exit(1);
1149
1150 load_interfaces();
1151
1152 if (!secrets_init()) {
1153
1154 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1155 return False;
1156 }
1157
1158 /* Enable netbios namecache */
1159
1160 namecache_enable();
1161
1162 /* Unblock all signals we are interested in as they may have been
1163 blocked by the parent process. */
1164
1165 BlockSignals(False, SIGINT);
1166 BlockSignals(False, SIGQUIT);
1167 BlockSignals(False, SIGTERM);
1168 BlockSignals(False, SIGUSR1);
1169 BlockSignals(False, SIGUSR2);
1170 BlockSignals(False, SIGHUP);
1171 BlockSignals(False, SIGCHLD);
1172
1173 if (!interactive)
1174 become_daemon(Fork, no_process_group);
1175
1176 pidfile_create("winbindd");
1177
1178#if HAVE_SETPGID
1179 /*
1180 * If we're interactive we want to set our own process group for
1181 * signal management.
1182 */
1183 if (interactive && !no_process_group)
1184 setpgid( (pid_t)0, (pid_t)0);
1185#endif
1186
1187 TimeInit();
1188
1189 /* Don't use winbindd_reinit_after_fork here as
1190 * we're just starting up and haven't created any
1191 * winbindd-specific resources we must free yet. JRA.
1192 */
1193
1194 if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1195 winbind_event_context(),
1196 false))) {
1197 DEBUG(0,("reinit_after_fork() failed\n"));
1198 exit(1);
1199 }
1200
1201 /* Setup signal handlers */
1202
1203 if (!winbindd_setup_sig_term_handler(true))
1204 exit(1);
1205 if (!winbindd_setup_sig_hup_handler(NULL))
1206 exit(1);
1207 if (!winbindd_setup_sig_chld_handler())
1208 exit(1);
1209 if (!winbindd_setup_sig_usr2_handler())
1210 exit(1);
1211
1212 CatchSignal(SIGPIPE, SIG_IGN); /* Ignore sigpipe */
1213
1214 /*
1215 * Ensure all cache and idmap caches are consistent
1216 * and initialized before we startup.
1217 */
1218 if (!winbindd_cache_validate_and_initialize()) {
1219 exit(1);
1220 }
1221
1222 /* get broadcast messages */
1223 claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1224
1225 /* React on 'smbcontrol winbindd reload-config' in the same way
1226 as to SIGHUP signal */
1227 messaging_register(winbind_messaging_context(), NULL,
1228 MSG_SMB_CONF_UPDATED, msg_reload_services);
1229 messaging_register(winbind_messaging_context(), NULL,
1230 MSG_SHUTDOWN, msg_shutdown);
1231
1232 /* Handle online/offline messages. */
1233 messaging_register(winbind_messaging_context(), NULL,
1234 MSG_WINBIND_OFFLINE, winbind_msg_offline);
1235 messaging_register(winbind_messaging_context(), NULL,
1236 MSG_WINBIND_ONLINE, winbind_msg_online);
1237 messaging_register(winbind_messaging_context(), NULL,
1238 MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1239
1240 messaging_register(winbind_messaging_context(), NULL,
1241 MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1242
1243 messaging_register(winbind_messaging_context(), NULL,
1244 MSG_WINBIND_VALIDATE_CACHE,
1245 winbind_msg_validate_cache);
1246
1247 messaging_register(winbind_messaging_context(), NULL,
1248 MSG_WINBIND_DUMP_DOMAIN_LIST,
1249 winbind_msg_dump_domain_list);
1250
1251 /* Register handler for MSG_DEBUG. */
1252 messaging_register(winbind_messaging_context(), NULL,
1253 MSG_DEBUG,
1254 winbind_msg_debug);
1255
1256 netsamlogon_cache_init(); /* Non-critical */
1257
1258 /* clear the cached list of trusted domains */
1259
1260 wcache_tdc_clear();
1261
1262 if (!init_domain_list()) {
1263 DEBUG(0,("unable to initialize domain list\n"));
1264 exit(1);
1265 }
1266
1267 init_idmap_child();
1268 init_locator_child();
1269
1270 smb_nscd_flush_user_cache();
1271 smb_nscd_flush_group_cache();
1272
1273 /* setup listen sockets */
1274
1275 if (!winbindd_setup_listeners()) {
1276 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1277 exit(1);
1278 }
1279
1280 if (lp_allow_trusted_domains()) {
1281 if (tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1282 rescan_trusted_domains, NULL) == NULL) {
1283 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1284 exit(1);
1285 }
1286 }
1287
1288 TALLOC_FREE(frame);
1289 /* Loop waiting for requests */
1290 while (1) {
1291 frame = talloc_stackframe();
1292
1293 if (tevent_loop_once(winbind_event_context()) == -1) {
1294 DEBUG(1, ("tevent_loop_once() failed: %s\n",
1295 strerror(errno)));
1296 return 1;
1297 }
1298
1299 TALLOC_FREE(frame);
1300 }
1301
1302 return 0;
1303}
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