source: branches/samba-3.5.x/source3/winbindd/winbindd.c@ 732

Last change on this file since 732 was 732, checked in by Silvan Scherrer, 13 years ago

Samba Server 3.5: update branche to 3.5.12
File size: 33.2 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
376 DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
377 "message.\n"));
378
379 /*
380 * call the validation code from a child:
381 * so we don't block the main winbindd and the validation
382 * code can safely use fork/waitpid...
383 */
384 child_pid = sys_fork();
385
386 if (child_pid == -1) {
387 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
388 strerror(errno)));
389 return;
390 }
391
392 if (child_pid != 0) {
393 /* parent */
394 DEBUG(5, ("winbind_msg_validate_cache: child created with "
395 "pid %d.\n", (int)child_pid));
396 return;
397 }
398
399 /* child */
400
401 if (!winbindd_reinit_after_fork(NULL)) {
402 _exit(0);
403 }
404
405 /* install default SIGCHLD handler: validation code uses fork/waitpid */
406 CatchSignal(SIGCHLD, SIG_DFL);
407
408 ret = (uint8)winbindd_validate_cache_nobackup();
409 DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
410 messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
411 (size_t)1);
412 _exit(0);
413}
414
415static struct winbindd_dispatch_table {
416 enum winbindd_cmd cmd;
417 void (*fn)(struct winbindd_cli_state *state);
418 const char *winbindd_cmd_name;
419} dispatch_table[] = {
420
421 /* PAM auth functions */
422
423 { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
424 { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
425 { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
426 { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
427 { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
428
429 /* Enumeration functions */
430
431 { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
432 "LIST_TRUSTDOM" },
433
434 /* Miscellaneous */
435
436 { WINBINDD_INFO, winbindd_info, "INFO" },
437 { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
438 "INTERFACE_VERSION" },
439 { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
440 { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
441 { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
442 { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
443 "WINBINDD_PRIV_PIPE_DIR" },
444
445 /* Credential cache access */
446 { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
447 { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
448
449 /* WINS functions */
450
451 { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
452 { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
453
454 /* End of list */
455
456 { WINBINDD_NUM_CMDS, NULL, "NONE" }
457};
458
459struct winbindd_async_dispatch_table {
460 enum winbindd_cmd cmd;
461 const char *cmd_name;
462 struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
463 struct tevent_context *ev,
464 struct winbindd_cli_state *cli,
465 struct winbindd_request *request);
466 NTSTATUS (*recv_req)(struct tevent_req *req,
467 struct winbindd_response *presp);
468};
469
470static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
471 { WINBINDD_PING, "PING",
472 wb_ping_send, wb_ping_recv },
473 { WINBINDD_LOOKUPSID, "LOOKUPSID",
474 winbindd_lookupsid_send, winbindd_lookupsid_recv },
475 { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
476 winbindd_lookupname_send, winbindd_lookupname_recv },
477 { WINBINDD_SID_TO_UID, "SID_TO_UID",
478 winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
479 { WINBINDD_SID_TO_GID, "SID_TO_GID",
480 winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
481 { WINBINDD_UID_TO_SID, "UID_TO_SID",
482 winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
483 { WINBINDD_GID_TO_SID, "GID_TO_SID",
484 winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
485 { WINBINDD_GETPWSID, "GETPWSID",
486 winbindd_getpwsid_send, winbindd_getpwsid_recv },
487 { WINBINDD_GETPWNAM, "GETPWNAM",
488 winbindd_getpwnam_send, winbindd_getpwnam_recv },
489 { WINBINDD_GETPWUID, "GETPWUID",
490 winbindd_getpwuid_send, winbindd_getpwuid_recv },
491 { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
492 winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
493 { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
494 winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
495 { WINBINDD_GETGROUPS, "GETGROUPS",
496 winbindd_getgroups_send, winbindd_getgroups_recv },
497 { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
498 winbindd_show_sequence_send, winbindd_show_sequence_recv },
499 { WINBINDD_GETGRGID, "GETGRGID",
500 winbindd_getgrgid_send, winbindd_getgrgid_recv },
501 { WINBINDD_GETGRNAM, "GETGRNAM",
502 winbindd_getgrnam_send, winbindd_getgrnam_recv },
503 { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
504 winbindd_getusersids_send, winbindd_getusersids_recv },
505 { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
506 winbindd_lookuprids_send, winbindd_lookuprids_recv },
507 { WINBINDD_SETPWENT, "SETPWENT",
508 winbindd_setpwent_send, winbindd_setpwent_recv },
509 { WINBINDD_GETPWENT, "GETPWENT",
510 winbindd_getpwent_send, winbindd_getpwent_recv },
511 { WINBINDD_ENDPWENT, "ENDPWENT",
512 winbindd_endpwent_send, winbindd_endpwent_recv },
513 { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
514 winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
515 { WINBINDD_GETDCNAME, "GETDCNAME",
516 winbindd_getdcname_send, winbindd_getdcname_recv },
517 { WINBINDD_SETGRENT, "SETGRENT",
518 winbindd_setgrent_send, winbindd_setgrent_recv },
519 { WINBINDD_GETGRENT, "GETGRENT",
520 winbindd_getgrent_send, winbindd_getgrent_recv },
521 { WINBINDD_ENDGRENT, "ENDGRENT",
522 winbindd_endgrent_send, winbindd_endgrent_recv },
523 { WINBINDD_LIST_USERS, "LIST_USERS",
524 winbindd_list_users_send, winbindd_list_users_recv },
525 { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
526 winbindd_list_groups_send, winbindd_list_groups_recv },
527 { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
528 winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
529 { WINBINDD_PING_DC, "PING_DC",
530 winbindd_ping_dc_send, winbindd_ping_dc_recv },
531
532 { 0, NULL, NULL, NULL }
533};
534
535static struct winbindd_async_dispatch_table async_priv_table[] = {
536 { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
537 winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
538 { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
539 winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
540 { WINBINDD_SET_MAPPING, "SET_MAPPING",
541 winbindd_set_mapping_send, winbindd_set_mapping_recv },
542 { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
543 winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
544 { WINBINDD_SET_HWM, "SET_HWM",
545 winbindd_set_hwm_send, winbindd_set_hwm_recv },
546 { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
547 winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
548
549 { 0, NULL, NULL, NULL }
550};
551
552static void wb_request_done(struct tevent_req *req);
553
554static void process_request(struct winbindd_cli_state *state)
555{
556 struct winbindd_dispatch_table *table = dispatch_table;
557 struct winbindd_async_dispatch_table *atable;
558
559 state->mem_ctx = talloc_init("winbind request");
560 if (state->mem_ctx == NULL)
561 return;
562
563 /* Remember who asked us. */
564 state->pid = state->request->pid;
565
566 state->cmd_name = "unknown request";
567 state->recv_fn = NULL;
568
569 /* Process command */
570
571 for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
572 if (state->request->cmd == atable->cmd) {
573 break;
574 }
575 }
576
577 if ((atable->send_req == NULL) && state->privileged) {
578 for (atable = async_priv_table; atable->send_req;
579 atable += 1) {
580 if (state->request->cmd == atable->cmd) {
581 break;
582 }
583 }
584 }
585
586 if (atable->send_req != NULL) {
587 struct tevent_req *req;
588
589 state->cmd_name = atable->cmd_name;
590 state->recv_fn = atable->recv_req;
591
592 DEBUG(10, ("process_request: Handling async request %d:%s\n",
593 (int)state->pid, state->cmd_name));
594
595 req = atable->send_req(state->mem_ctx, winbind_event_context(),
596 state, state->request);
597 if (req == NULL) {
598 DEBUG(0, ("process_request: atable->send failed for "
599 "%s\n", atable->cmd_name));
600 request_error(state);
601 return;
602 }
603 tevent_req_set_callback(req, wb_request_done, state);
604 return;
605 }
606
607 state->response = talloc_zero(state->mem_ctx,
608 struct winbindd_response);
609 if (state->response == NULL) {
610 DEBUG(10, ("talloc failed\n"));
611 remove_client(state);
612 return;
613 }
614 state->response->result = WINBINDD_PENDING;
615 state->response->length = sizeof(struct winbindd_response);
616
617 for (table = dispatch_table; table->fn; table++) {
618 if (state->request->cmd == table->cmd) {
619 DEBUG(10,("process_request: request fn %s\n",
620 table->winbindd_cmd_name ));
621 state->cmd_name = table->winbindd_cmd_name;
622 table->fn(state);
623 break;
624 }
625 }
626
627 if (!table->fn) {
628 DEBUG(10,("process_request: unknown request fn number %d\n",
629 (int)state->request->cmd ));
630 request_error(state);
631 }
632}
633
634static void wb_request_done(struct tevent_req *req)
635{
636 struct winbindd_cli_state *state = tevent_req_callback_data(
637 req, struct winbindd_cli_state);
638 NTSTATUS status;
639
640 state->response = talloc_zero(state->mem_ctx,
641 struct winbindd_response);
642 if (state->response == NULL) {
643 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
644 (int)state->pid, state->cmd_name));
645 remove_client(state);
646 return;
647 }
648 state->response->result = WINBINDD_PENDING;
649 state->response->length = sizeof(struct winbindd_response);
650
651 status = state->recv_fn(req, state->response);
652 TALLOC_FREE(req);
653
654 DEBUG(10,("wb_request_done[%d:%s]: %s\n",
655 (int)state->pid, state->cmd_name, nt_errstr(status)));
656
657 if (!NT_STATUS_IS_OK(status)) {
658 request_error(state);
659 return;
660 }
661 request_ok(state);
662}
663
664/*
665 * This is the main event loop of winbind requests. It goes through a
666 * state-machine of 3 read/write requests, 4 if you have extra data to send.
667 *
668 * An idle winbind client has a read request of 4 bytes outstanding,
669 * finalizing function is request_len_recv, checking the length. request_recv
670 * then processes the packet. The processing function then at some point has
671 * to call request_finished which schedules sending the response.
672 */
673
674static void request_finished(struct winbindd_cli_state *state);
675
676static void winbind_client_request_read(struct tevent_req *req);
677static void winbind_client_response_written(struct tevent_req *req);
678
679static void request_finished(struct winbindd_cli_state *state)
680{
681 struct tevent_req *req;
682
683 TALLOC_FREE(state->request);
684
685 req = wb_resp_write_send(state, winbind_event_context(),
686 state->out_queue, state->sock,
687 state->response);
688 if (req == NULL) {
689 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
690 (int)state->pid, state->cmd_name));
691 remove_client(state);
692 return;
693 }
694 tevent_req_set_callback(req, winbind_client_response_written, state);
695}
696
697static void winbind_client_response_written(struct tevent_req *req)
698{
699 struct winbindd_cli_state *state = tevent_req_callback_data(
700 req, struct winbindd_cli_state);
701 ssize_t ret;
702 int err;
703
704 ret = wb_resp_write_recv(req, &err);
705 TALLOC_FREE(req);
706 if (ret == -1) {
707 close(state->sock);
708 state->sock = -1;
709 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
710 (int)state->pid, state->cmd_name, strerror(err)));
711 remove_client(state);
712 return;
713 }
714
715 DEBUG(10,("winbind_client_response_written[%d:%s]: deliverd response to client\n",
716 (int)state->pid, state->cmd_name));
717
718 TALLOC_FREE(state->mem_ctx);
719 state->response = NULL;
720 state->cmd_name = "no request";
721 state->recv_fn = NULL;
722
723 req = wb_req_read_send(state, winbind_event_context(), state->sock,
724 WINBINDD_MAX_EXTRA_DATA);
725 if (req == NULL) {
726 remove_client(state);
727 return;
728 }
729 tevent_req_set_callback(req, winbind_client_request_read, state);
730}
731
732void request_error(struct winbindd_cli_state *state)
733{
734 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
735 state->response->result = WINBINDD_ERROR;
736 request_finished(state);
737}
738
739void request_ok(struct winbindd_cli_state *state)
740{
741 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
742 state->response->result = WINBINDD_OK;
743 request_finished(state);
744}
745
746/* Process a new connection by adding it to the client connection list */
747
748static void new_connection(int listen_sock, bool privileged)
749{
750 struct sockaddr_un sunaddr;
751 struct winbindd_cli_state *state;
752 struct tevent_req *req;
753 socklen_t len;
754 int sock;
755
756 /* Accept connection */
757
758 len = sizeof(sunaddr);
759
760 do {
761 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
762 &len);
763 } while (sock == -1 && errno == EINTR);
764
765 if (sock == -1)
766 return;
767
768 DEBUG(6,("accepted socket %d\n", sock));
769
770 /* Create new connection structure */
771
772 if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
773 close(sock);
774 return;
775 }
776
777 state->sock = sock;
778
779 state->out_queue = tevent_queue_create(state, "winbind client reply");
780 if (state->out_queue == NULL) {
781 close(sock);
782 TALLOC_FREE(state);
783 return;
784 }
785
786 state->last_access = time(NULL);
787
788 state->privileged = privileged;
789
790 req = wb_req_read_send(state, winbind_event_context(), state->sock,
791 WINBINDD_MAX_EXTRA_DATA);
792 if (req == NULL) {
793 TALLOC_FREE(state);
794 close(sock);
795 return;
796 }
797 tevent_req_set_callback(req, winbind_client_request_read, state);
798
799 /* Add to connection list */
800
801 winbindd_add_client(state);
802}
803
804static void winbind_client_request_read(struct tevent_req *req)
805{
806 struct winbindd_cli_state *state = tevent_req_callback_data(
807 req, struct winbindd_cli_state);
808 ssize_t ret;
809 int err;
810
811 ret = wb_req_read_recv(req, state, &state->request, &err);
812 TALLOC_FREE(req);
813 if (ret == -1) {
814 if (err == EPIPE) {
815 DEBUG(6, ("closing socket %d, client exited\n",
816 state->sock));
817 } else {
818 DEBUG(2, ("Could not read client request from fd %d: "
819 "%s\n", state->sock, strerror(err)));
820 }
821 close(state->sock);
822 state->sock = -1;
823 remove_client(state);
824 return;
825 }
826 process_request(state);
827}
828
829/* Remove a client connection from client connection list */
830
831static void remove_client(struct winbindd_cli_state *state)
832{
833 char c = 0;
834 int nwritten;
835
836 /* It's a dead client - hold a funeral */
837
838 if (state == NULL) {
839 return;
840 }
841
842 if (state->sock != -1) {
843 /* tell client, we are closing ... */
844 nwritten = write(state->sock, &c, sizeof(c));
845 if (nwritten == -1) {
846 DEBUG(2, ("final write to client failed: %s\n",
847 strerror(errno)));
848 }
849
850 /* Close socket */
851
852 close(state->sock);
853 state->sock = -1;
854 }
855
856 TALLOC_FREE(state->mem_ctx);
857
858 /* Remove from list and free */
859
860 winbindd_remove_client(state);
861 TALLOC_FREE(state);
862}
863
864/* Shutdown client connection which has been idle for the longest time */
865
866static bool remove_idle_client(void)
867{
868 struct winbindd_cli_state *state, *remove_state = NULL;
869 time_t last_access = 0;
870 int nidle = 0;
871
872 for (state = winbindd_client_list(); state; state = state->next) {
873 if (state->response == NULL &&
874 !state->pwent_state && !state->grent_state) {
875 nidle++;
876 if (!last_access || state->last_access < last_access) {
877 last_access = state->last_access;
878 remove_state = state;
879 }
880 }
881 }
882
883 if (remove_state) {
884 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
885 nidle, remove_state->sock, (unsigned int)remove_state->pid));
886 remove_client(remove_state);
887 return True;
888 }
889
890 return False;
891}
892
893struct winbindd_listen_state {
894 bool privileged;
895 int fd;
896};
897
898static void winbindd_listen_fde_handler(struct tevent_context *ev,
899 struct tevent_fd *fde,
900 uint16_t flags,
901 void *private_data)
902{
903 struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
904 struct winbindd_listen_state);
905
906 while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
907 DEBUG(5,("winbindd: Exceeding %d client "
908 "connections, removing idle "
909 "connection.\n", lp_winbind_max_clients()));
910 if (!remove_idle_client()) {
911 DEBUG(0,("winbindd: Exceeding %d "
912 "client connections, no idle "
913 "connection found\n",
914 lp_winbind_max_clients()));
915 break;
916 }
917 }
918 new_connection(s->fd, s->privileged);
919}
920
921static bool winbindd_setup_listeners(void)
922{
923 struct winbindd_listen_state *pub_state = NULL;
924 struct winbindd_listen_state *priv_state = NULL;
925 struct tevent_fd *fde;
926
927 pub_state = talloc(winbind_event_context(),
928 struct winbindd_listen_state);
929 if (!pub_state) {
930 goto failed;
931 }
932
933 pub_state->privileged = false;
934 pub_state->fd = open_winbindd_socket();
935 if (pub_state->fd == -1) {
936 goto failed;
937 }
938
939 fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
940 TEVENT_FD_READ, winbindd_listen_fde_handler,
941 pub_state);
942 if (fde == NULL) {
943 close(pub_state->fd);
944 goto failed;
945 }
946 tevent_fd_set_auto_close(fde);
947
948 priv_state = talloc(winbind_event_context(),
949 struct winbindd_listen_state);
950 if (!priv_state) {
951 goto failed;
952 }
953
954 priv_state->privileged = true;
955 priv_state->fd = open_winbindd_priv_socket();
956 if (priv_state->fd == -1) {
957 goto failed;
958 }
959
960 fde = tevent_add_fd(winbind_event_context(), priv_state,
961 priv_state->fd, TEVENT_FD_READ,
962 winbindd_listen_fde_handler, priv_state);
963 if (fde == NULL) {
964 close(priv_state->fd);
965 goto failed;
966 }
967 tevent_fd_set_auto_close(fde);
968
969 return true;
970failed:
971 TALLOC_FREE(pub_state);
972 TALLOC_FREE(priv_state);
973 return false;
974}
975
976bool winbindd_use_idmap_cache(void)
977{
978 return !opt_nocache;
979}
980
981bool winbindd_use_cache(void)
982{
983 return !opt_nocache;
984}
985
986/* Main function */
987
988int main(int argc, char **argv, char **envp)
989{
990 static bool is_daemon = False;
991 static bool Fork = True;
992 static bool log_stdout = False;
993 static bool no_process_group = False;
994 enum {
995 OPT_DAEMON = 1000,
996 OPT_FORK,
997 OPT_NO_PROCESS_GROUP,
998 OPT_LOG_STDOUT
999 };
1000 struct poptOption long_options[] = {
1001 POPT_AUTOHELP
1002 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1003 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1004 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1005 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1006 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1007 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1008 POPT_COMMON_SAMBA
1009 POPT_TABLEEND
1010 };
1011 poptContext pc;
1012 int opt;
1013 TALLOC_CTX *frame = talloc_stackframe();
1014
1015 /* glibc (?) likes to print "User defined signal 1" and exit if a
1016 SIGUSR[12] is received before a handler is installed */
1017
1018 CatchSignal(SIGUSR1, SIG_IGN);
1019 CatchSignal(SIGUSR2, SIG_IGN);
1020
1021 fault_setup((void (*)(void *))fault_quit );
1022 dump_core_setup("winbindd");
1023
1024 load_case_tables();
1025
1026 /* Initialise for running in non-root mode */
1027
1028 sec_init();
1029
1030 set_remote_machine_name("winbindd", False);
1031
1032 /* Set environment variable so we don't recursively call ourselves.
1033 This may also be useful interactively. */
1034
1035 if ( !winbind_off() ) {
1036 DEBUG(0,("Failed to disable recusive winbindd calls. Exiting.\n"));
1037 exit(1);
1038 }
1039
1040 /* Initialise samba/rpc client stuff */
1041
1042 pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1043
1044 while ((opt = poptGetNextOpt(pc)) != -1) {
1045 switch (opt) {
1046 /* Don't become a daemon */
1047 case OPT_DAEMON:
1048 is_daemon = True;
1049 break;
1050 case 'i':
1051 interactive = True;
1052 log_stdout = True;
1053 Fork = False;
1054 break;
1055 case OPT_FORK:
1056 Fork = false;
1057 break;
1058 case OPT_NO_PROCESS_GROUP:
1059 no_process_group = true;
1060 break;
1061 case OPT_LOG_STDOUT:
1062 log_stdout = true;
1063 break;
1064 case 'n':
1065 opt_nocache = true;
1066 break;
1067 default:
1068 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1069 poptBadOption(pc, 0), poptStrerror(opt));
1070 poptPrintUsage(pc, stderr, 0);
1071 exit(1);
1072 }
1073 }
1074
1075 if (is_daemon && interactive) {
1076 d_fprintf(stderr,"\nERROR: "
1077 "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1078 poptPrintUsage(pc, stderr, 0);
1079 exit(1);
1080 }
1081
1082 if (log_stdout && Fork) {
1083 d_fprintf(stderr, "\nERROR: "
1084 "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1085 poptPrintUsage(pc, stderr, 0);
1086 exit(1);
1087 }
1088
1089 poptFreeContext(pc);
1090
1091 if (!override_logfile) {
1092 char *lfile = NULL;
1093 if (asprintf(&lfile,"%s/log.winbindd",
1094 get_dyn_LOGFILEBASE()) > 0) {
1095 lp_set_logfile(lfile);
1096 SAFE_FREE(lfile);
1097 }
1098 }
1099 setup_logging("winbindd", log_stdout);
1100 reopen_logs();
1101
1102 DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1103 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1104
1105 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1106 DEBUG(0, ("error opening config file\n"));
1107 exit(1);
1108 }
1109
1110 /* Initialise messaging system */
1111
1112 if (winbind_messaging_context() == NULL) {
1113 exit(1);
1114 }
1115
1116 if (!reload_services_file(NULL)) {
1117 DEBUG(0, ("error opening config file\n"));
1118 exit(1);
1119 }
1120
1121 if (!directory_exist(lp_lockdir())) {
1122 mkdir(lp_lockdir(), 0755);
1123 }
1124
1125 /* Setup names. */
1126
1127 if (!init_names())
1128 exit(1);
1129
1130 load_interfaces();
1131
1132 if (!secrets_init()) {
1133
1134 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1135 return False;
1136 }
1137
1138 /* Enable netbios namecache */
1139
1140 namecache_enable();
1141
1142 /* Unblock all signals we are interested in as they may have been
1143 blocked by the parent process. */
1144
1145 BlockSignals(False, SIGINT);
1146 BlockSignals(False, SIGQUIT);
1147 BlockSignals(False, SIGTERM);
1148 BlockSignals(False, SIGUSR1);
1149 BlockSignals(False, SIGUSR2);
1150 BlockSignals(False, SIGHUP);
1151 BlockSignals(False, SIGCHLD);
1152
1153 if (!interactive)
1154 become_daemon(Fork, no_process_group);
1155
1156 pidfile_create("winbindd");
1157
1158#if HAVE_SETPGID
1159 /*
1160 * If we're interactive we want to set our own process group for
1161 * signal management.
1162 */
1163 if (interactive && !no_process_group)
1164 setpgid( (pid_t)0, (pid_t)0);
1165#endif
1166
1167 TimeInit();
1168
1169 /* Don't use winbindd_reinit_after_fork here as
1170 * we're just starting up and haven't created any
1171 * winbindd-specific resources we must free yet. JRA.
1172 */
1173
1174 if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1175 winbind_event_context(),
1176 false))) {
1177 DEBUG(0,("reinit_after_fork() failed\n"));
1178 exit(1);
1179 }
1180
1181 /* Setup signal handlers */
1182
1183 if (!winbindd_setup_sig_term_handler(true))
1184 exit(1);
1185 if (!winbindd_setup_sig_hup_handler(NULL))
1186 exit(1);
1187 if (!winbindd_setup_sig_chld_handler())
1188 exit(1);
1189 if (!winbindd_setup_sig_usr2_handler())
1190 exit(1);
1191
1192 CatchSignal(SIGPIPE, SIG_IGN); /* Ignore sigpipe */
1193
1194 /*
1195 * Ensure all cache and idmap caches are consistent
1196 * and initialized before we startup.
1197 */
1198 if (!winbindd_cache_validate_and_initialize()) {
1199 exit(1);
1200 }
1201
1202 /* get broadcast messages */
1203 claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1204
1205 /* React on 'smbcontrol winbindd reload-config' in the same way
1206 as to SIGHUP signal */
1207 messaging_register(winbind_messaging_context(), NULL,
1208 MSG_SMB_CONF_UPDATED, msg_reload_services);
1209 messaging_register(winbind_messaging_context(), NULL,
1210 MSG_SHUTDOWN, msg_shutdown);
1211
1212 /* Handle online/offline messages. */
1213 messaging_register(winbind_messaging_context(), NULL,
1214 MSG_WINBIND_OFFLINE, winbind_msg_offline);
1215 messaging_register(winbind_messaging_context(), NULL,
1216 MSG_WINBIND_ONLINE, winbind_msg_online);
1217 messaging_register(winbind_messaging_context(), NULL,
1218 MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1219
1220 messaging_register(winbind_messaging_context(), NULL,
1221 MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1222
1223 messaging_register(winbind_messaging_context(), NULL,
1224 MSG_WINBIND_VALIDATE_CACHE,
1225 winbind_msg_validate_cache);
1226
1227 messaging_register(winbind_messaging_context(), NULL,
1228 MSG_WINBIND_DUMP_DOMAIN_LIST,
1229 winbind_msg_dump_domain_list);
1230
1231 /* Register handler for MSG_DEBUG. */
1232 messaging_register(winbind_messaging_context(), NULL,
1233 MSG_DEBUG,
1234 winbind_msg_debug);
1235
1236 netsamlogon_cache_init(); /* Non-critical */
1237
1238 /* clear the cached list of trusted domains */
1239
1240 wcache_tdc_clear();
1241
1242 if (!init_domain_list()) {
1243 DEBUG(0,("unable to initialize domain list\n"));
1244 exit(1);
1245 }
1246
1247 init_idmap_child();
1248 init_locator_child();
1249
1250 smb_nscd_flush_user_cache();
1251 smb_nscd_flush_group_cache();
1252
1253 /* setup listen sockets */
1254
1255 if (!winbindd_setup_listeners()) {
1256 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1257 exit(1);
1258 }
1259
1260 if (lp_allow_trusted_domains()) {
1261 if (tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1262 rescan_trusted_domains, NULL) == NULL) {
1263 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1264 exit(1);
1265 }
1266 }
1267
1268 TALLOC_FREE(frame);
1269 /* Loop waiting for requests */
1270 while (1) {
1271 frame = talloc_stackframe();
1272
1273 if (tevent_loop_once(winbind_event_context()) == -1) {
1274 DEBUG(1, ("tevent_loop_once() failed: %s\n",
1275 strerror(errno)));
1276 return 1;
1277 }
1278
1279 TALLOC_FREE(frame);
1280 }
1281
1282 return 0;
1283}
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