source: trunk/server/source3/winbindd/winbindd.c@ 429

Last change on this file since 429 was 429, checked in by Silvan Scherrer, 15 years ago

Samba 3.5.x: trunk update to 3.5.2
File size: 33.4 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 state->cmd_name = "unknown request";
574 state->recv_fn = NULL;
575
576 /* Process command */
577
578 for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
579 if (state->request->cmd == atable->cmd) {
580 break;
581 }
582 }
583
584 if ((atable->send_req == NULL) && state->privileged) {
585 for (atable = async_priv_table; atable->send_req;
586 atable += 1) {
587 if (state->request->cmd == atable->cmd) {
588 break;
589 }
590 }
591 }
592
593 if (atable->send_req != NULL) {
594 struct tevent_req *req;
595
596 state->cmd_name = atable->cmd_name;
597 state->recv_fn = atable->recv_req;
598
599 DEBUG(10, ("process_request: Handling async request %d:%s\n",
600 (int)state->pid, state->cmd_name));
601
602 req = atable->send_req(state->mem_ctx, winbind_event_context(),
603 state, state->request);
604 if (req == NULL) {
605 DEBUG(0, ("process_request: atable->send failed for "
606 "%s\n", atable->cmd_name));
607 request_error(state);
608 return;
609 }
610 tevent_req_set_callback(req, wb_request_done, state);
611 return;
612 }
613
614 state->response = talloc_zero(state->mem_ctx,
615 struct winbindd_response);
616 if (state->response == NULL) {
617 DEBUG(10, ("talloc failed\n"));
618 remove_client(state);
619 return;
620 }
621 state->response->result = WINBINDD_PENDING;
622 state->response->length = sizeof(struct winbindd_response);
623
624 for (table = dispatch_table; table->fn; table++) {
625 if (state->request->cmd == table->cmd) {
626 DEBUG(10,("process_request: request fn %s\n",
627 table->winbindd_cmd_name ));
628 state->cmd_name = table->winbindd_cmd_name;
629 table->fn(state);
630 break;
631 }
632 }
633
634 if (!table->fn) {
635 DEBUG(10,("process_request: unknown request fn number %d\n",
636 (int)state->request->cmd ));
637 request_error(state);
638 }
639}
640
641static void wb_request_done(struct tevent_req *req)
642{
643 struct winbindd_cli_state *state = tevent_req_callback_data(
644 req, struct winbindd_cli_state);
645 NTSTATUS status;
646
647 state->response = talloc_zero(state->mem_ctx,
648 struct winbindd_response);
649 if (state->response == NULL) {
650 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
651 (int)state->pid, state->cmd_name));
652 remove_client(state);
653 return;
654 }
655 state->response->result = WINBINDD_PENDING;
656 state->response->length = sizeof(struct winbindd_response);
657
658 status = state->recv_fn(req, state->response);
659 TALLOC_FREE(req);
660
661 DEBUG(10,("wb_request_done[%d:%s]: %s\n",
662 (int)state->pid, state->cmd_name, nt_errstr(status)));
663
664 if (!NT_STATUS_IS_OK(status)) {
665 request_error(state);
666 return;
667 }
668 request_ok(state);
669}
670
671/*
672 * This is the main event loop of winbind requests. It goes through a
673 * state-machine of 3 read/write requests, 4 if you have extra data to send.
674 *
675 * An idle winbind client has a read request of 4 bytes outstanding,
676 * finalizing function is request_len_recv, checking the length. request_recv
677 * then processes the packet. The processing function then at some point has
678 * to call request_finished which schedules sending the response.
679 */
680
681static void request_finished(struct winbindd_cli_state *state);
682
683static void winbind_client_request_read(struct tevent_req *req);
684static void winbind_client_response_written(struct tevent_req *req);
685
686static void request_finished(struct winbindd_cli_state *state)
687{
688 struct tevent_req *req;
689
690 TALLOC_FREE(state->request);
691
692 req = wb_resp_write_send(state, winbind_event_context(),
693 state->out_queue, state->sock,
694 state->response);
695 if (req == NULL) {
696 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
697 (int)state->pid, state->cmd_name));
698 remove_client(state);
699 return;
700 }
701 tevent_req_set_callback(req, winbind_client_response_written, state);
702}
703
704static void winbind_client_response_written(struct tevent_req *req)
705{
706 struct winbindd_cli_state *state = tevent_req_callback_data(
707 req, struct winbindd_cli_state);
708 ssize_t ret;
709 int err;
710
711 ret = wb_resp_write_recv(req, &err);
712 TALLOC_FREE(req);
713 if (ret == -1) {
714 close(state->sock);
715 state->sock = -1;
716 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
717 (int)state->pid, state->cmd_name, strerror(err)));
718 remove_client(state);
719 return;
720 }
721
722 DEBUG(10,("winbind_client_response_written[%d:%s]: deliverd response to client\n",
723 (int)state->pid, state->cmd_name));
724
725 TALLOC_FREE(state->mem_ctx);
726 state->response = NULL;
727 state->cmd_name = "no request";
728 state->recv_fn = NULL;
729
730 req = wb_req_read_send(state, winbind_event_context(), state->sock,
731 WINBINDD_MAX_EXTRA_DATA);
732 if (req == NULL) {
733 remove_client(state);
734 return;
735 }
736 tevent_req_set_callback(req, winbind_client_request_read, state);
737}
738
739void request_error(struct winbindd_cli_state *state)
740{
741 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
742 state->response->result = WINBINDD_ERROR;
743 request_finished(state);
744}
745
746void request_ok(struct winbindd_cli_state *state)
747{
748 SMB_ASSERT(state->response->result == WINBINDD_PENDING);
749 state->response->result = WINBINDD_OK;
750 request_finished(state);
751}
752
753/* Process a new connection by adding it to the client connection list */
754
755static void new_connection(int listen_sock, bool privileged)
756{
757 struct sockaddr_un sunaddr;
758 struct winbindd_cli_state *state;
759 struct tevent_req *req;
760 socklen_t len;
761 int sock;
762
763 /* Accept connection */
764
765 len = sizeof(sunaddr);
766
767 do {
768 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
769 &len);
770 } while (sock == -1 && errno == EINTR);
771
772 if (sock == -1)
773 return;
774
775 DEBUG(6,("accepted socket %d\n", sock));
776
777 /* Create new connection structure */
778
779 if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
780 close(sock);
781 return;
782 }
783
784 state->sock = sock;
785
786 state->out_queue = tevent_queue_create(state, "winbind client reply");
787 if (state->out_queue == NULL) {
788 close(sock);
789 TALLOC_FREE(state);
790 return;
791 }
792
793 state->last_access = time(NULL);
794
795 state->privileged = privileged;
796
797 req = wb_req_read_send(state, winbind_event_context(), state->sock,
798 WINBINDD_MAX_EXTRA_DATA);
799 if (req == NULL) {
800 TALLOC_FREE(state);
801 close(sock);
802 return;
803 }
804 tevent_req_set_callback(req, winbind_client_request_read, state);
805
806 /* Add to connection list */
807
808 winbindd_add_client(state);
809}
810
811static void winbind_client_request_read(struct tevent_req *req)
812{
813 struct winbindd_cli_state *state = tevent_req_callback_data(
814 req, struct winbindd_cli_state);
815 ssize_t ret;
816 int err;
817
818 ret = wb_req_read_recv(req, state, &state->request, &err);
819 TALLOC_FREE(req);
820 if (ret == -1) {
821 if (err == EPIPE) {
822 DEBUG(6, ("closing socket %d, client exited\n",
823 state->sock));
824 } else {
825 DEBUG(2, ("Could not read client request from fd %d: "
826 "%s\n", state->sock, strerror(err)));
827 }
828 close(state->sock);
829 state->sock = -1;
830 remove_client(state);
831 return;
832 }
833 process_request(state);
834}
835
836/* Remove a client connection from client connection list */
837
838static void remove_client(struct winbindd_cli_state *state)
839{
840 char c = 0;
841 int nwritten;
842
843 /* It's a dead client - hold a funeral */
844
845 if (state == NULL) {
846 return;
847 }
848
849 if (state->sock != -1) {
850 /* tell client, we are closing ... */
851 nwritten = write(state->sock, &c, sizeof(c));
852 if (nwritten == -1) {
853 DEBUG(2, ("final write to client failed: %s\n",
854 strerror(errno)));
855 }
856
857 /* Close socket */
858
859 close(state->sock);
860 state->sock = -1;
861 }
862
863 TALLOC_FREE(state->mem_ctx);
864
865 /* Remove from list and free */
866
867 winbindd_remove_client(state);
868 TALLOC_FREE(state);
869}
870
871/* Shutdown client connection which has been idle for the longest time */
872
873static bool remove_idle_client(void)
874{
875 struct winbindd_cli_state *state, *remove_state = NULL;
876 time_t last_access = 0;
877 int nidle = 0;
878
879 for (state = winbindd_client_list(); state; state = state->next) {
880 if (state->response == NULL &&
881 !state->pwent_state && !state->grent_state) {
882 nidle++;
883 if (!last_access || state->last_access < last_access) {
884 last_access = state->last_access;
885 remove_state = state;
886 }
887 }
888 }
889
890 if (remove_state) {
891 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
892 nidle, remove_state->sock, (unsigned int)remove_state->pid));
893 remove_client(remove_state);
894 return True;
895 }
896
897 return False;
898}
899
900struct winbindd_listen_state {
901 bool privileged;
902 int fd;
903};
904
905static void winbindd_listen_fde_handler(struct tevent_context *ev,
906 struct tevent_fd *fde,
907 uint16_t flags,
908 void *private_data)
909{
910 struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
911 struct winbindd_listen_state);
912
913 while (winbindd_num_clients() >
914 WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
915 DEBUG(5,("winbindd: Exceeding %d client "
916 "connections, removing idle "
917 "connection.\n",
918 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
919 if (!remove_idle_client()) {
920 DEBUG(0,("winbindd: Exceeding %d "
921 "client connections, no idle "
922 "connection found\n",
923 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
924 break;
925 }
926 }
927 new_connection(s->fd, s->privileged);
928}
929
930static bool winbindd_setup_listeners(void)
931{
932 struct winbindd_listen_state *pub_state = NULL;
933 struct winbindd_listen_state *priv_state = NULL;
934 struct tevent_fd *fde;
935
936 pub_state = talloc(winbind_event_context(),
937 struct winbindd_listen_state);
938 if (!pub_state) {
939 goto failed;
940 }
941
942 pub_state->privileged = false;
943 pub_state->fd = open_winbindd_socket();
944 if (pub_state->fd == -1) {
945 goto failed;
946 }
947
948 fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
949 TEVENT_FD_READ, winbindd_listen_fde_handler,
950 pub_state);
951 if (fde == NULL) {
952 close(pub_state->fd);
953 goto failed;
954 }
955 tevent_fd_set_auto_close(fde);
956
957 priv_state = talloc(winbind_event_context(),
958 struct winbindd_listen_state);
959 if (!priv_state) {
960 goto failed;
961 }
962
963 priv_state->privileged = true;
964 priv_state->fd = open_winbindd_priv_socket();
965 if (priv_state->fd == -1) {
966 goto failed;
967 }
968
969 fde = tevent_add_fd(winbind_event_context(), priv_state,
970 priv_state->fd, TEVENT_FD_READ,
971 winbindd_listen_fde_handler, priv_state);
972 if (fde == NULL) {
973 close(priv_state->fd);
974 goto failed;
975 }
976 tevent_fd_set_auto_close(fde);
977
978 return true;
979failed:
980 TALLOC_FREE(pub_state);
981 TALLOC_FREE(priv_state);
982 return false;
983}
984
985bool winbindd_use_idmap_cache(void)
986{
987 return !opt_nocache;
988}
989
990bool winbindd_use_cache(void)
991{
992 return !opt_nocache;
993}
994
995/* Main function */
996
997int main(int argc, char **argv, char **envp)
998{
999 static bool is_daemon = False;
1000 static bool Fork = True;
1001 static bool log_stdout = False;
1002 static bool no_process_group = False;
1003 enum {
1004 OPT_DAEMON = 1000,
1005 OPT_FORK,
1006 OPT_NO_PROCESS_GROUP,
1007 OPT_LOG_STDOUT
1008 };
1009 struct poptOption long_options[] = {
1010 POPT_AUTOHELP
1011 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1012 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1013 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1014 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1015 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1016 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1017 POPT_COMMON_SAMBA
1018 POPT_TABLEEND
1019 };
1020 poptContext pc;
1021 int opt;
1022 TALLOC_CTX *frame = talloc_stackframe();
1023 struct tevent_timer *te;
1024
1025 /* glibc (?) likes to print "User defined signal 1" and exit if a
1026 SIGUSR[12] is received before a handler is installed */
1027
1028 CatchSignal(SIGUSR1, SIG_IGN);
1029 CatchSignal(SIGUSR2, SIG_IGN);
1030
1031 fault_setup((void (*)(void *))fault_quit );
1032 dump_core_setup("winbindd");
1033
1034 load_case_tables();
1035
1036 /* Initialise for running in non-root mode */
1037
1038 sec_init();
1039
1040 set_remote_machine_name("winbindd", False);
1041
1042 /* Set environment variable so we don't recursively call ourselves.
1043 This may also be useful interactively. */
1044
1045 if ( !winbind_off() ) {
1046 DEBUG(0,("Failed to disable recusive winbindd calls. Exiting.\n"));
1047 exit(1);
1048 }
1049
1050 /* Initialise samba/rpc client stuff */
1051
1052 pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1053
1054 while ((opt = poptGetNextOpt(pc)) != -1) {
1055 switch (opt) {
1056 /* Don't become a daemon */
1057 case OPT_DAEMON:
1058 is_daemon = True;
1059 break;
1060 case 'i':
1061 interactive = True;
1062 log_stdout = True;
1063 Fork = False;
1064 break;
1065 case OPT_FORK:
1066 Fork = false;
1067 break;
1068 case OPT_NO_PROCESS_GROUP:
1069 no_process_group = true;
1070 break;
1071 case OPT_LOG_STDOUT:
1072 log_stdout = true;
1073 break;
1074 case 'n':
1075 opt_nocache = true;
1076 break;
1077 default:
1078 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1079 poptBadOption(pc, 0), poptStrerror(opt));
1080 poptPrintUsage(pc, stderr, 0);
1081 exit(1);
1082 }
1083 }
1084
1085 if (is_daemon && interactive) {
1086 d_fprintf(stderr,"\nERROR: "
1087 "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1088 poptPrintUsage(pc, stderr, 0);
1089 exit(1);
1090 }
1091
1092 if (log_stdout && Fork) {
1093 d_fprintf(stderr, "\nERROR: "
1094 "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1095 poptPrintUsage(pc, stderr, 0);
1096 exit(1);
1097 }
1098
1099 poptFreeContext(pc);
1100
1101 if (!override_logfile) {
1102 char *lfile = NULL;
1103 if (asprintf(&lfile,"%s/log.winbindd",
1104 get_dyn_LOGFILEBASE()) > 0) {
1105 lp_set_logfile(lfile);
1106 SAFE_FREE(lfile);
1107 }
1108 }
1109 setup_logging("winbindd", log_stdout);
1110 reopen_logs();
1111
1112 DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1113 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1114
1115 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1116 DEBUG(0, ("error opening config file\n"));
1117 exit(1);
1118 }
1119
1120 /* Initialise messaging system */
1121
1122 if (winbind_messaging_context() == NULL) {
1123 exit(1);
1124 }
1125
1126 if (!reload_services_file(NULL)) {
1127 DEBUG(0, ("error opening config file\n"));
1128 exit(1);
1129 }
1130
1131 if (!directory_exist(lp_lockdir())) {
1132 mkdir(lp_lockdir(), 0755);
1133 }
1134
1135 /* Setup names. */
1136
1137 if (!init_names())
1138 exit(1);
1139
1140 load_interfaces();
1141
1142 if (!secrets_init()) {
1143
1144 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1145 return False;
1146 }
1147
1148 /* Enable netbios namecache */
1149
1150 namecache_enable();
1151
1152 /* Unblock all signals we are interested in as they may have been
1153 blocked by the parent process. */
1154
1155 BlockSignals(False, SIGINT);
1156 BlockSignals(False, SIGQUIT);
1157 BlockSignals(False, SIGTERM);
1158 BlockSignals(False, SIGUSR1);
1159 BlockSignals(False, SIGUSR2);
1160 BlockSignals(False, SIGHUP);
1161 BlockSignals(False, SIGCHLD);
1162
1163 if (!interactive)
1164 become_daemon(Fork, no_process_group);
1165
1166 pidfile_create("winbindd");
1167
1168#if HAVE_SETPGID
1169 /*
1170 * If we're interactive we want to set our own process group for
1171 * signal management.
1172 */
1173 if (interactive && !no_process_group)
1174 setpgid( (pid_t)0, (pid_t)0);
1175#endif
1176
1177 TimeInit();
1178
1179 /* Don't use winbindd_reinit_after_fork here as
1180 * we're just starting up and haven't created any
1181 * winbindd-specific resources we must free yet. JRA.
1182 */
1183
1184 if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1185 winbind_event_context(),
1186 false))) {
1187 DEBUG(0,("reinit_after_fork() failed\n"));
1188 exit(1);
1189 }
1190
1191 /* Setup signal handlers */
1192
1193 if (!winbindd_setup_sig_term_handler(true))
1194 exit(1);
1195 if (!winbindd_setup_sig_hup_handler(NULL))
1196 exit(1);
1197 if (!winbindd_setup_sig_chld_handler())
1198 exit(1);
1199 if (!winbindd_setup_sig_usr2_handler())
1200 exit(1);
1201
1202 CatchSignal(SIGPIPE, SIG_IGN); /* Ignore sigpipe */
1203
1204 /*
1205 * Ensure all cache and idmap caches are consistent
1206 * and initialized before we startup.
1207 */
1208 if (!winbindd_cache_validate_and_initialize()) {
1209 exit(1);
1210 }
1211
1212 /* get broadcast messages */
1213 claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1214
1215 /* React on 'smbcontrol winbindd reload-config' in the same way
1216 as to SIGHUP signal */
1217 messaging_register(winbind_messaging_context(), NULL,
1218 MSG_SMB_CONF_UPDATED, msg_reload_services);
1219 messaging_register(winbind_messaging_context(), NULL,
1220 MSG_SHUTDOWN, msg_shutdown);
1221
1222 /* Handle online/offline messages. */
1223 messaging_register(winbind_messaging_context(), NULL,
1224 MSG_WINBIND_OFFLINE, winbind_msg_offline);
1225 messaging_register(winbind_messaging_context(), NULL,
1226 MSG_WINBIND_ONLINE, winbind_msg_online);
1227 messaging_register(winbind_messaging_context(), NULL,
1228 MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1229
1230 messaging_register(winbind_messaging_context(), NULL,
1231 MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1232
1233 messaging_register(winbind_messaging_context(), NULL,
1234 MSG_WINBIND_VALIDATE_CACHE,
1235 winbind_msg_validate_cache);
1236
1237 messaging_register(winbind_messaging_context(), NULL,
1238 MSG_WINBIND_DUMP_DOMAIN_LIST,
1239 winbind_msg_dump_domain_list);
1240
1241 /* Register handler for MSG_DEBUG. */
1242 messaging_register(winbind_messaging_context(), NULL,
1243 MSG_DEBUG,
1244 winbind_msg_debug);
1245
1246 netsamlogon_cache_init(); /* Non-critical */
1247
1248 /* clear the cached list of trusted domains */
1249
1250 wcache_tdc_clear();
1251
1252 if (!init_domain_list()) {
1253 DEBUG(0,("unable to initialize domain list\n"));
1254 exit(1);
1255 }
1256
1257 init_idmap_child();
1258 init_locator_child();
1259
1260 smb_nscd_flush_user_cache();
1261 smb_nscd_flush_group_cache();
1262
1263 /* setup listen sockets */
1264
1265 if (!winbindd_setup_listeners()) {
1266 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1267 exit(1);
1268 }
1269
1270 te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1271 rescan_trusted_domains, NULL);
1272 if (te == NULL) {
1273 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1274 exit(1);
1275 }
1276
1277 TALLOC_FREE(frame);
1278 /* Loop waiting for requests */
1279 while (1) {
1280 frame = talloc_stackframe();
1281
1282 if (tevent_loop_once(winbind_event_context()) == -1) {
1283 DEBUG(1, ("tevent_loop_once() failed: %s\n",
1284 strerror(errno)));
1285 return 1;
1286 }
1287
1288 TALLOC_FREE(frame);
1289 }
1290
1291 return 0;
1292}
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