source: branches/samba-3.3.x/source/winbindd/winbindd.c

Last change on this file was 578, checked in by Herwig Bauernfeind, 14 years ago

Update Samba 3.3 to 3.3.15 (security update)
File size: 32.9 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
28#undef DBGC_CLASS
29#define DBGC_CLASS DBGC_WINBIND
30
31static bool opt_nocache = False;
32static bool interactive = False;
33
34extern bool override_logfile;
35
36struct event_context *winbind_event_context(void)
37{
38 static struct event_context *ctx;
39
40 if (!ctx && !(ctx = event_context_init(NULL))) {
41 smb_panic("Could not init winbind event context");
42 }
43 return ctx;
44}
45
46struct messaging_context *winbind_messaging_context(void)
47{
48 static struct messaging_context *ctx;
49
50 if (ctx == NULL) {
51 ctx = messaging_init(NULL, server_id_self(),
52 winbind_event_context());
53 }
54 if (ctx == NULL) {
55 DEBUG(0, ("Could not init winbind messaging context.\n"));
56 }
57 return ctx;
58}
59
60/* Reload configuration */
61
62static bool reload_services_file(const char *lfile)
63{
64 bool ret;
65
66 if (lp_loaded()) {
67 const char *fname = lp_configfile();
68
69 if (file_exist(fname,NULL) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
70 set_dyn_CONFIGFILE(fname);
71 }
72 }
73
74 /* if this is a child, restore the logfile to the special
75 name - <domain>, idmap, etc. */
76 if (lfile && *lfile) {
77 lp_set_logfile(lfile);
78 }
79
80 reopen_logs();
81 ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
82
83 reopen_logs();
84 load_interfaces();
85
86 return(ret);
87}
88
89
90/**************************************************************************** **
91 Handle a fault..
92 **************************************************************************** */
93
94static void fault_quit(void)
95{
96 dump_core();
97}
98
99static void winbindd_status(void)
100{
101 struct winbindd_cli_state *tmp;
102
103 DEBUG(0, ("winbindd status:\n"));
104
105 /* Print client state information */
106
107 DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
108
109 if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
110 DEBUG(2, ("\tclient list:\n"));
111 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
112 DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
113 (unsigned long)tmp->pid, tmp->sock));
114 }
115 }
116}
117
118/* Print winbindd status to log file */
119
120static void print_winbindd_status(void)
121{
122 winbindd_status();
123}
124
125/* Flush client cache */
126
127static void flush_caches(void)
128{
129 /* We need to invalidate cached user list entries on a SIGHUP
130 otherwise cached access denied errors due to restrict anonymous
131 hang around until the sequence number changes. */
132
133 if (!wcache_invalidate_cache()) {
134 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
135 if (!winbindd_cache_validate_and_initialize()) {
136 exit(1);
137 }
138 }
139}
140
141/* Handle the signal by unlinking socket and exiting */
142
143static void terminate(bool is_parent)
144{
145 if (is_parent) {
146 /* When parent goes away we should
147 * remove the socket file. Not so
148 * when children terminate.
149 */
150 char *path = NULL;
151
152 if (asprintf(&path, "%s/%s",
153 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
154 unlink(path);
155 SAFE_FREE(path);
156 }
157 }
158
159 idmap_close();
160
161 trustdom_cache_shutdown();
162
163#if 0
164 if (interactive) {
165 TALLOC_CTX *mem_ctx = talloc_init("end_description");
166 char *description = talloc_describe_all(mem_ctx);
167
168 DEBUG(3, ("tallocs left:\n%s\n", description));
169 talloc_destroy(mem_ctx);
170 }
171#endif
172
173 exit(0);
174}
175
176static SIG_ATOMIC_T do_sigterm = 0;
177
178static void termination_handler(int signum)
179{
180 do_sigterm = 1;
181 sys_select_signal(signum);
182}
183
184static SIG_ATOMIC_T do_sigusr2 = 0;
185
186static void sigusr2_handler(int signum)
187{
188 do_sigusr2 = 1;
189 sys_select_signal(SIGUSR2);
190}
191
192static SIG_ATOMIC_T do_sighup = 0;
193
194static void sighup_handler(int signum)
195{
196 do_sighup = 1;
197 sys_select_signal(SIGHUP);
198}
199
200static SIG_ATOMIC_T do_sigchld = 0;
201
202static void sigchld_handler(int signum)
203{
204 do_sigchld = 1;
205 sys_select_signal(SIGCHLD);
206}
207
208/* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
209static void msg_reload_services(struct messaging_context *msg,
210 void *private_data,
211 uint32_t msg_type,
212 struct server_id server_id,
213 DATA_BLOB *data)
214{
215 /* Flush various caches */
216 flush_caches();
217 reload_services_file((const char *) private_data);
218}
219
220/* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
221static void msg_shutdown(struct messaging_context *msg,
222 void *private_data,
223 uint32_t msg_type,
224 struct server_id server_id,
225 DATA_BLOB *data)
226{
227 do_sigterm = 1;
228}
229
230
231static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
232 void *private_data,
233 uint32_t msg_type,
234 struct server_id server_id,
235 DATA_BLOB *data)
236{
237 uint8 ret;
238 pid_t child_pid;
239 struct sigaction act;
240 struct sigaction oldact;
241
242 DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
243 "message.\n"));
244
245 /*
246 * call the validation code from a child:
247 * so we don't block the main winbindd and the validation
248 * code can safely use fork/waitpid...
249 */
250 CatchChild();
251 child_pid = sys_fork();
252
253 if (child_pid == -1) {
254 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
255 strerror(errno)));
256 return;
257 }
258
259 if (child_pid != 0) {
260 /* parent */
261 DEBUG(5, ("winbind_msg_validate_cache: child created with "
262 "pid %d.\n", (int)child_pid));
263 return;
264 }
265
266 /* child */
267
268 /* install default SIGCHLD handler: validation code uses fork/waitpid */
269 ZERO_STRUCT(act);
270 act.sa_handler = SIG_DFL;
271#ifdef SA_RESTART
272 /* We *want* SIGALRM to interrupt a system call. */
273 act.sa_flags = SA_RESTART;
274#endif
275 sigemptyset(&act.sa_mask);
276 sigaddset(&act.sa_mask,SIGCHLD);
277 sigaction(SIGCHLD,&act,&oldact);
278
279 ret = (uint8)winbindd_validate_cache_nobackup();
280 DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
281 messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
282 (size_t)1);
283 _exit(0);
284}
285
286static struct winbindd_dispatch_table {
287 enum winbindd_cmd cmd;
288 void (*fn)(struct winbindd_cli_state *state);
289 const char *winbindd_cmd_name;
290} dispatch_table[] = {
291
292 /* User functions */
293
294 { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
295 { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
296
297 { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
298 { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
299 { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
300
301 { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
302 { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
303 { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
304 "GETUSERDOMGROUPS" },
305
306 /* Group functions */
307
308 { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
309 { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
310 { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
311 { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
312 { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
313 { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
314
315 /* PAM auth functions */
316
317 { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
318 { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
319 { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
320 { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
321 { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
322
323 /* Enumeration functions */
324
325 { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
326 { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
327 { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
328 "LIST_TRUSTDOM" },
329 { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
330
331 /* SID related functions */
332
333 { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
334 { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
335 { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
336
337 /* Lookup related functions */
338
339 { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
340 { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
341 { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
342 { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
343 { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
344 { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
345 { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
346 { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
347 { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
348
349 /* Miscellaneous */
350
351 { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
352 { WINBINDD_PING, winbindd_ping, "PING" },
353 { WINBINDD_INFO, winbindd_info, "INFO" },
354 { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
355 "INTERFACE_VERSION" },
356 { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
357 { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
358 { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
359 { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
360 "WINBINDD_PRIV_PIPE_DIR" },
361 { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
362 { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
363
364 /* Credential cache access */
365 { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
366
367 /* WINS functions */
368
369 { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
370 { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
371
372 /* End of list */
373
374 { WINBINDD_NUM_CMDS, NULL, "NONE" }
375};
376
377static void process_request(struct winbindd_cli_state *state)
378{
379 struct winbindd_dispatch_table *table = dispatch_table;
380
381 /* Free response data - we may be interrupted and receive another
382 command before being able to send this data off. */
383
384 SAFE_FREE(state->response.extra_data.data);
385
386 ZERO_STRUCT(state->response);
387
388 state->response.result = WINBINDD_PENDING;
389 state->response.length = sizeof(struct winbindd_response);
390
391 state->mem_ctx = talloc_init("winbind request");
392 if (state->mem_ctx == NULL)
393 return;
394
395 /* Remember who asked us. */
396 state->pid = state->request.pid;
397
398 /* Process command */
399
400 for (table = dispatch_table; table->fn; table++) {
401 if (state->request.cmd == table->cmd) {
402 DEBUG(10,("process_request: request fn %s\n",
403 table->winbindd_cmd_name ));
404 table->fn(state);
405 break;
406 }
407 }
408
409 if (!table->fn) {
410 DEBUG(10,("process_request: unknown request fn number %d\n",
411 (int)state->request.cmd ));
412 request_error(state);
413 }
414}
415
416/*
417 * A list of file descriptors being monitored by select in the main processing
418 * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
419 */
420
421static struct winbindd_fd_event *fd_events = NULL;
422
423void add_fd_event(struct winbindd_fd_event *ev)
424{
425 struct winbindd_fd_event *match;
426
427 /* only add unique winbindd_fd_event structs */
428
429 for (match=fd_events; match; match=match->next ) {
430#ifdef DEVELOPER
431 SMB_ASSERT( match != ev );
432#else
433 if ( match == ev )
434 return;
435#endif
436 }
437
438 DLIST_ADD(fd_events, ev);
439}
440
441void remove_fd_event(struct winbindd_fd_event *ev)
442{
443 DLIST_REMOVE(fd_events, ev);
444}
445
446/*
447 * Handler for winbindd_fd_events to complete a read/write request, set up by
448 * setup_async_read/setup_async_write.
449 */
450
451static void rw_callback(struct winbindd_fd_event *event, int flags)
452{
453 size_t todo;
454 ssize_t done = 0;
455
456 todo = event->length - event->done;
457
458 if (event->flags & EVENT_FD_WRITE) {
459 SMB_ASSERT(flags == EVENT_FD_WRITE);
460 done = sys_write(event->fd,
461 &((char *)event->data)[event->done],
462 todo);
463
464 if (done <= 0) {
465 event->flags = 0;
466 event->finished(event->private_data, False);
467 return;
468 }
469 }
470
471 if (event->flags & EVENT_FD_READ) {
472 SMB_ASSERT(flags == EVENT_FD_READ);
473 done = sys_read(event->fd, &((char *)event->data)[event->done],
474 todo);
475
476 if (done <= 0) {
477 event->flags = 0;
478 event->finished(event->private_data, False);
479 return;
480 }
481 }
482
483 event->done += done;
484
485 if (event->done == event->length) {
486 event->flags = 0;
487 event->finished(event->private_data, True);
488 }
489}
490
491/*
492 * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
493 * when the request is completed or an error had occurred.
494 */
495
496void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
497 void (*finished)(void *private_data, bool success),
498 void *private_data)
499{
500 SMB_ASSERT(event->flags == 0);
501 event->data = data;
502 event->length = length;
503 event->done = 0;
504 event->handler = rw_callback;
505 event->finished = finished;
506 event->private_data = private_data;
507 event->flags = EVENT_FD_READ;
508}
509
510void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
511 void (*finished)(void *private_data, bool success),
512 void *private_data)
513{
514 SMB_ASSERT(event->flags == 0);
515 event->data = data;
516 event->length = length;
517 event->done = 0;
518 event->handler = rw_callback;
519 event->finished = finished;
520 event->private_data = private_data;
521 event->flags = EVENT_FD_WRITE;
522}
523
524/*
525 * This is the main event loop of winbind requests. It goes through a
526 * state-machine of 3 read/write requests, 4 if you have extra data to send.
527 *
528 * An idle winbind client has a read request of 4 bytes outstanding,
529 * finalizing function is request_len_recv, checking the length. request_recv
530 * then processes the packet. The processing function then at some point has
531 * to call request_finished which schedules sending the response.
532 */
533
534static void request_len_recv(void *private_data, bool success);
535static void request_recv(void *private_data, bool success);
536static void request_main_recv(void *private_data, bool success);
537static void request_finished(struct winbindd_cli_state *state);
538static void response_main_sent(void *private_data, bool success);
539static void response_extra_sent(void *private_data, bool success);
540
541static void response_extra_sent(void *private_data, bool success)
542{
543 struct winbindd_cli_state *state =
544 talloc_get_type_abort(private_data, struct winbindd_cli_state);
545
546 TALLOC_FREE(state->mem_ctx);
547
548 if (!success) {
549 state->finished = True;
550 return;
551 }
552
553 SAFE_FREE(state->response.extra_data.data);
554
555 setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
556 request_len_recv, state);
557}
558
559static void response_main_sent(void *private_data, bool success)
560{
561 struct winbindd_cli_state *state =
562 talloc_get_type_abort(private_data, struct winbindd_cli_state);
563
564 if (!success) {
565 state->finished = True;
566 return;
567 }
568
569 if (state->response.length == sizeof(state->response)) {
570 TALLOC_FREE(state->mem_ctx);
571
572 setup_async_read(&state->fd_event, &state->request,
573 sizeof(uint32), request_len_recv, state);
574 return;
575 }
576
577 setup_async_write(&state->fd_event, state->response.extra_data.data,
578 state->response.length - sizeof(state->response),
579 response_extra_sent, state);
580}
581
582static void request_finished(struct winbindd_cli_state *state)
583{
584 /* Make sure request.extra_data is freed when finish processing a request */
585 SAFE_FREE(state->request.extra_data.data);
586 setup_async_write(&state->fd_event, &state->response,
587 sizeof(state->response), response_main_sent, state);
588}
589
590void request_error(struct winbindd_cli_state *state)
591{
592 SMB_ASSERT(state->response.result == WINBINDD_PENDING);
593 state->response.result = WINBINDD_ERROR;
594 request_finished(state);
595}
596
597void request_ok(struct winbindd_cli_state *state)
598{
599 SMB_ASSERT(state->response.result == WINBINDD_PENDING);
600 state->response.result = WINBINDD_OK;
601 request_finished(state);
602}
603
604static void request_len_recv(void *private_data, bool success)
605{
606 struct winbindd_cli_state *state =
607 talloc_get_type_abort(private_data, struct winbindd_cli_state);
608
609 if (!success) {
610 state->finished = True;
611 return;
612 }
613
614 if (*(uint32 *)(&state->request) != sizeof(state->request)) {
615 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
616 *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
617 state->finished = True;
618 return;
619 }
620
621 setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
622 sizeof(state->request) - sizeof(uint32),
623 request_main_recv, state);
624}
625
626static void request_main_recv(void *private_data, bool success)
627{
628 struct winbindd_cli_state *state =
629 talloc_get_type_abort(private_data, struct winbindd_cli_state);
630
631 if (!success) {
632 state->finished = True;
633 return;
634 }
635
636 if (state->request.extra_len == 0) {
637 state->request.extra_data.data = NULL;
638 request_recv(state, True);
639 return;
640 }
641
642 if ((!state->privileged) &&
643 (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
644 DEBUG(3, ("Got request with %d bytes extra data on "
645 "unprivileged socket\n", (int)state->request.extra_len));
646 state->request.extra_data.data = NULL;
647 state->finished = True;
648 return;
649 }
650
651 state->request.extra_data.data =
652 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
653
654 if (state->request.extra_data.data == NULL) {
655 DEBUG(0, ("malloc failed\n"));
656 state->finished = True;
657 return;
658 }
659
660 /* Ensure null termination */
661 state->request.extra_data.data[state->request.extra_len] = '\0';
662
663 setup_async_read(&state->fd_event, state->request.extra_data.data,
664 state->request.extra_len, request_recv, state);
665}
666
667static void request_recv(void *private_data, bool success)
668{
669 struct winbindd_cli_state *state =
670 talloc_get_type_abort(private_data, struct winbindd_cli_state);
671
672 if (!success) {
673 state->finished = True;
674 return;
675 }
676
677 process_request(state);
678}
679
680/* Process a new connection by adding it to the client connection list */
681
682static void new_connection(int listen_sock, bool privileged)
683{
684 struct sockaddr_un sunaddr;
685 struct winbindd_cli_state *state;
686 socklen_t len;
687 int sock;
688
689 /* Accept connection */
690
691 len = sizeof(sunaddr);
692
693 do {
694 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
695 } while (sock == -1 && errno == EINTR);
696
697 if (sock == -1)
698 return;
699
700 DEBUG(6,("accepted socket %d\n", sock));
701
702 /* Create new connection structure */
703
704 if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
705 close(sock);
706 return;
707 }
708
709 state->sock = sock;
710
711 state->last_access = time(NULL);
712
713 state->privileged = privileged;
714
715 state->fd_event.fd = state->sock;
716 state->fd_event.flags = 0;
717 add_fd_event(&state->fd_event);
718
719 setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
720 request_len_recv, state);
721
722 /* Add to connection list */
723
724 winbindd_add_client(state);
725}
726
727/* Remove a client connection from client connection list */
728
729static void remove_client(struct winbindd_cli_state *state)
730{
731 char c = 0;
732 int nwritten;
733
734 /* It's a dead client - hold a funeral */
735
736 if (state == NULL) {
737 return;
738 }
739
740 /* tell client, we are closing ... */
741 nwritten = write(state->sock, &c, sizeof(c));
742 if (nwritten == -1) {
743 DEBUG(2, ("final write to client failed: %s\n",
744 strerror(errno)));
745 }
746
747 /* Close socket */
748
749 close(state->sock);
750
751 /* Free any getent state */
752
753 free_getent_state(state->getpwent_state);
754 free_getent_state(state->getgrent_state);
755
756 /* We may have some extra data that was not freed if the client was
757 killed unexpectedly */
758
759 SAFE_FREE(state->response.extra_data.data);
760
761 TALLOC_FREE(state->mem_ctx);
762
763 remove_fd_event(&state->fd_event);
764
765 /* Remove from list and free */
766
767 winbindd_remove_client(state);
768 TALLOC_FREE(state);
769}
770
771/* Shutdown client connection which has been idle for the longest time */
772
773static bool remove_idle_client(void)
774{
775 struct winbindd_cli_state *state, *remove_state = NULL;
776 time_t last_access = 0;
777 int nidle = 0;
778
779 for (state = winbindd_client_list(); state; state = state->next) {
780 if (state->response.result != WINBINDD_PENDING &&
781 state->fd_event.flags == EVENT_FD_READ &&
782 !state->getpwent_state && !state->getgrent_state) {
783 nidle++;
784 if (!last_access || state->last_access < last_access) {
785 last_access = state->last_access;
786 remove_state = state;
787 }
788 }
789 }
790
791 if (remove_state) {
792 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
793 nidle, remove_state->sock, (unsigned int)remove_state->pid));
794 remove_client(remove_state);
795 return True;
796 }
797
798 return False;
799}
800
801/* check if HUP has been received and reload files */
802void winbind_check_sighup(const char *lfile)
803{
804 if (do_sighup) {
805
806 DEBUG(3, ("got SIGHUP\n"));
807
808 flush_caches();
809 reload_services_file(lfile);
810
811 do_sighup = 0;
812 }
813}
814
815/* check if TERM has been received */
816void winbind_check_sigterm(bool is_parent)
817{
818 if (do_sigterm)
819 terminate(is_parent);
820}
821
822/* Process incoming clients on listen_sock. We use a tricky non-blocking,
823 non-forking, non-threaded model which allows us to handle many
824 simultaneous connections while remaining impervious to many denial of
825 service attacks. */
826
827static void process_loop(void)
828{
829 struct winbindd_cli_state *state;
830 struct winbindd_fd_event *ev;
831 fd_set r_fds, w_fds;
832 int maxfd, listen_sock, listen_priv_sock, selret;
833 struct timeval timeout, ev_timeout;
834
835 /* Open Sockets here to get stuff going ASAP */
836 listen_sock = open_winbindd_socket();
837 listen_priv_sock = open_winbindd_priv_socket();
838
839 if (listen_sock < 0 || listen_sock >= FD_SETSIZE ||
840 listen_priv_sock < 0 || listen_priv_sock >= FD_SETSIZE) {
841 perror("open_winbind_socket");
842 exit(1);
843 }
844
845 /* We'll be doing this a lot */
846
847 /* Handle messages */
848
849 message_dispatch(winbind_messaging_context());
850
851 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
852 return;
853 }
854
855 /* refresh the trusted domain cache */
856
857 rescan_trusted_domains();
858
859 /* Initialise fd lists for select() */
860
861 maxfd = MAX(listen_sock, listen_priv_sock);
862
863 FD_ZERO(&r_fds);
864 FD_ZERO(&w_fds);
865
866 /* We check the range for listen_sock and
867 listen_priv_sock above. */
868 FD_SET(listen_sock, &r_fds);
869 FD_SET(listen_priv_sock, &r_fds);
870
871 timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
872 timeout.tv_usec = 0;
873
874 /* Check for any event timeouts. */
875 if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
876 timeout = timeval_min(&timeout, &ev_timeout);
877 }
878
879 /* Set up client readers and writers */
880
881 state = winbindd_client_list();
882
883 while (state) {
884
885 struct winbindd_cli_state *next = state->next;
886
887 /* Dispose of client connection if it is marked as
888 finished */
889
890 if (state->finished)
891 remove_client(state);
892
893 state = next;
894 }
895
896 for (ev = fd_events; ev; ev = ev->next) {
897 if (ev->fd < 0 || ev->fd >= FD_SETSIZE) {
898 /* Ignore here - event_add_to_select_args
899 should make this impossible. */
900 continue;
901 }
902
903 if (ev->flags & EVENT_FD_READ) {
904 FD_SET(ev->fd, &r_fds);
905 maxfd = MAX(ev->fd, maxfd);
906 }
907 if (ev->flags & EVENT_FD_WRITE) {
908 FD_SET(ev->fd, &w_fds);
909 maxfd = MAX(ev->fd, maxfd);
910 }
911 }
912
913 /* Call select */
914
915 selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
916
917 if (selret == 0) {
918 goto no_fds_ready;
919 }
920
921 if (selret == -1) {
922 if (errno == EINTR) {
923 goto no_fds_ready;
924 }
925
926 /* Select error, something is badly wrong */
927
928 perror("select");
929 exit(1);
930 }
931
932 /* selret > 0 */
933
934 ev = fd_events;
935 while (ev != NULL) {
936 struct winbindd_fd_event *next = ev->next;
937 int flags = 0;
938 if (FD_ISSET(ev->fd, &r_fds))
939 flags |= EVENT_FD_READ;
940 if (FD_ISSET(ev->fd, &w_fds))
941 flags |= EVENT_FD_WRITE;
942 if (flags) {
943 ev->handler(ev, flags);
944 return;
945 }
946 ev = next;
947 }
948
949 if (FD_ISSET(listen_sock, &r_fds)) {
950 while (winbindd_num_clients() >
951 WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
952 DEBUG(5,("winbindd: Exceeding %d client "
953 "connections, removing idle "
954 "connection.\n",
955 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
956 if (!remove_idle_client()) {
957 DEBUG(0,("winbindd: Exceeding %d "
958 "client connections, no idle "
959 "connection found\n",
960 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
961 break;
962 }
963 }
964 /* new, non-privileged connection */
965 new_connection(listen_sock, False);
966 }
967
968 if (FD_ISSET(listen_priv_sock, &r_fds)) {
969 while (winbindd_num_clients() >
970 WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
971 DEBUG(5,("winbindd: Exceeding %d client "
972 "connections, removing idle "
973 "connection.\n",
974 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
975 if (!remove_idle_client()) {
976 DEBUG(0,("winbindd: Exceeding %d "
977 "client connections, no idle "
978 "connection found\n",
979 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
980 break;
981 }
982 }
983 /* new, privileged connection */
984 new_connection(listen_priv_sock, True);
985 }
986
987 no_fds_ready:
988
989#if 0
990 winbindd_check_cache_size(time(NULL));
991#endif
992
993 /* Check signal handling things */
994
995 winbind_check_sigterm(true);
996 winbind_check_sighup(NULL);
997
998 if (do_sigusr2) {
999 print_winbindd_status();
1000 do_sigusr2 = 0;
1001 }
1002
1003 if (do_sigchld) {
1004 pid_t pid;
1005
1006 do_sigchld = 0;
1007
1008 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
1009 winbind_child_died(pid);
1010 }
1011 }
1012}
1013
1014bool winbindd_use_idmap_cache(void)
1015{
1016 return !opt_nocache;
1017}
1018
1019bool winbindd_use_cache(void)
1020{
1021 return !opt_nocache;
1022}
1023
1024/* Main function */
1025
1026int main(int argc, char **argv, char **envp)
1027{
1028 static bool is_daemon = False;
1029 static bool Fork = True;
1030 static bool log_stdout = False;
1031 static bool no_process_group = False;
1032 enum {
1033 OPT_DAEMON = 1000,
1034 OPT_FORK,
1035 OPT_NO_PROCESS_GROUP,
1036 OPT_LOG_STDOUT
1037 };
1038 struct poptOption long_options[] = {
1039 POPT_AUTOHELP
1040 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1041 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1042 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1043 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1044 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1045 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1046 POPT_COMMON_SAMBA
1047 POPT_TABLEEND
1048 };
1049 poptContext pc;
1050 int opt;
1051 TALLOC_CTX *frame = talloc_stackframe();
1052
1053 /* glibc (?) likes to print "User defined signal 1" and exit if a
1054 SIGUSR[12] is received before a handler is installed */
1055
1056 CatchSignal(SIGUSR1, SIG_IGN);
1057 CatchSignal(SIGUSR2, SIG_IGN);
1058
1059 fault_setup((void (*)(void *))fault_quit );
1060 dump_core_setup("winbindd");
1061
1062 load_case_tables();
1063
1064 /* Initialise for running in non-root mode */
1065
1066 sec_init();
1067
1068 set_remote_machine_name("winbindd", False);
1069
1070 /* Set environment variable so we don't recursively call ourselves.
1071 This may also be useful interactively. */
1072
1073 if ( !winbind_off() ) {
1074 DEBUG(0,("Failed to disable recusive winbindd calls. Exiting.\n"));
1075 exit(1);
1076 }
1077
1078 /* Initialise samba/rpc client stuff */
1079
1080 pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1081
1082 while ((opt = poptGetNextOpt(pc)) != -1) {
1083 switch (opt) {
1084 /* Don't become a daemon */
1085 case OPT_DAEMON:
1086 is_daemon = True;
1087 break;
1088 case 'i':
1089 interactive = True;
1090 log_stdout = True;
1091 Fork = False;
1092 break;
1093 case OPT_FORK:
1094 Fork = false;
1095 break;
1096 case OPT_NO_PROCESS_GROUP:
1097 no_process_group = true;
1098 break;
1099 case OPT_LOG_STDOUT:
1100 log_stdout = true;
1101 break;
1102 case 'n':
1103 opt_nocache = true;
1104 break;
1105 default:
1106 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1107 poptBadOption(pc, 0), poptStrerror(opt));
1108 poptPrintUsage(pc, stderr, 0);
1109 exit(1);
1110 }
1111 }
1112
1113 if (is_daemon && interactive) {
1114 d_fprintf(stderr,"\nERROR: "
1115 "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1116 poptPrintUsage(pc, stderr, 0);
1117 exit(1);
1118 }
1119
1120 if (log_stdout && Fork) {
1121 d_fprintf(stderr, "\nERROR: "
1122 "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1123 poptPrintUsage(pc, stderr, 0);
1124 exit(1);
1125 }
1126
1127 poptFreeContext(pc);
1128
1129 if (!override_logfile) {
1130 char *lfile = NULL;
1131 if (asprintf(&lfile,"%s/log.winbindd",
1132 get_dyn_LOGFILEBASE()) > 0) {
1133 lp_set_logfile(lfile);
1134 SAFE_FREE(lfile);
1135 }
1136 }
1137 setup_logging("winbindd", log_stdout);
1138 reopen_logs();
1139
1140 DEBUG(0,("winbindd version %s started.\n", SAMBA_VERSION_STRING));
1141 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1142
1143 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1144 DEBUG(0, ("error opening config file\n"));
1145 exit(1);
1146 }
1147
1148 /* Initialise messaging system */
1149
1150 if (winbind_messaging_context() == NULL) {
1151 exit(1);
1152 }
1153
1154 if (!reload_services_file(NULL)) {
1155 DEBUG(0, ("error opening config file\n"));
1156 exit(1);
1157 }
1158
1159 if (!directory_exist(lp_lockdir(), NULL)) {
1160 mkdir(lp_lockdir(), 0755);
1161 }
1162
1163 /* Setup names. */
1164
1165 if (!init_names())
1166 exit(1);
1167
1168 load_interfaces();
1169
1170 if (!secrets_init()) {
1171
1172 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1173 return False;
1174 }
1175
1176 /* Enable netbios namecache */
1177
1178 namecache_enable();
1179
1180 /* Unblock all signals we are interested in as they may have been
1181 blocked by the parent process. */
1182
1183 BlockSignals(False, SIGINT);
1184 BlockSignals(False, SIGQUIT);
1185 BlockSignals(False, SIGTERM);
1186 BlockSignals(False, SIGUSR1);
1187 BlockSignals(False, SIGUSR2);
1188 BlockSignals(False, SIGHUP);
1189 BlockSignals(False, SIGCHLD);
1190
1191 /* Setup signal handlers */
1192
1193 CatchSignal(SIGINT, termination_handler); /* Exit on these sigs */
1194 CatchSignal(SIGQUIT, termination_handler);
1195 CatchSignal(SIGTERM, termination_handler);
1196 CatchSignal(SIGCHLD, sigchld_handler);
1197
1198 CatchSignal(SIGPIPE, SIG_IGN); /* Ignore sigpipe */
1199
1200 CatchSignal(SIGUSR2, sigusr2_handler); /* Debugging sigs */
1201 CatchSignal(SIGHUP, sighup_handler);
1202
1203 if (!interactive)
1204 become_daemon(Fork, no_process_group);
1205
1206 pidfile_create("winbindd");
1207
1208#if HAVE_SETPGID
1209 /*
1210 * If we're interactive we want to set our own process group for
1211 * signal management.
1212 */
1213 if (interactive && !no_process_group)
1214 setpgid( (pid_t)0, (pid_t)0);
1215#endif
1216
1217 TimeInit();
1218
1219 /* Don't use winbindd_reinit_after_fork here as
1220 * we're just starting up and haven't created any
1221 * winbindd-specific resources we must free yet. JRA.
1222 */
1223
1224 if (!reinit_after_fork(winbind_messaging_context(),
1225 winbind_event_context(), false)) {
1226 DEBUG(0,("reinit_after_fork() failed\n"));
1227 exit(1);
1228 }
1229
1230 /*
1231 * Ensure all cache and idmap caches are consistent
1232 * and initialized before we startup.
1233 */
1234 if (!winbindd_cache_validate_and_initialize()) {
1235 exit(1);
1236 }
1237
1238 /* get broadcast messages */
1239 claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1240
1241 /* React on 'smbcontrol winbindd reload-config' in the same way
1242 as to SIGHUP signal */
1243 messaging_register(winbind_messaging_context(), NULL,
1244 MSG_SMB_CONF_UPDATED, msg_reload_services);
1245 messaging_register(winbind_messaging_context(), NULL,
1246 MSG_SHUTDOWN, msg_shutdown);
1247
1248 /* Handle online/offline messages. */
1249 messaging_register(winbind_messaging_context(), NULL,
1250 MSG_WINBIND_OFFLINE, winbind_msg_offline);
1251 messaging_register(winbind_messaging_context(), NULL,
1252 MSG_WINBIND_ONLINE, winbind_msg_online);
1253 messaging_register(winbind_messaging_context(), NULL,
1254 MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1255
1256 messaging_register(winbind_messaging_context(), NULL,
1257 MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1258
1259 messaging_register(winbind_messaging_context(), NULL,
1260 MSG_WINBIND_VALIDATE_CACHE,
1261 winbind_msg_validate_cache);
1262
1263 messaging_register(winbind_messaging_context(), NULL,
1264 MSG_WINBIND_DUMP_DOMAIN_LIST,
1265 winbind_msg_dump_domain_list);
1266
1267 /* Register handler for MSG_DEBUG. */
1268 messaging_register(winbind_messaging_context(), NULL,
1269 MSG_DEBUG,
1270 winbind_msg_debug);
1271
1272 netsamlogon_cache_init(); /* Non-critical */
1273
1274 /* clear the cached list of trusted domains */
1275
1276 wcache_tdc_clear();
1277
1278 if (!init_domain_list()) {
1279 DEBUG(0,("unable to initialize domain list\n"));
1280 exit(1);
1281 }
1282
1283 init_idmap_child();
1284 init_locator_child();
1285
1286 smb_nscd_flush_user_cache();
1287 smb_nscd_flush_group_cache();
1288
1289 /* Loop waiting for requests */
1290
1291 TALLOC_FREE(frame);
1292 while (1) {
1293 frame = talloc_stackframe();
1294 process_loop();
1295 TALLOC_FREE(frame);
1296 }
1297
1298 return 0;
1299}
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