summaryrefslogtreecommitdiffstats
path: root/source3/rpc_server/eventlog/srv_eventlog_nt.c
blob: a946c5731437bb5a70f5bb02ae1b10cbe07a1086 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
/*
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines
 *  Copyright (C) Marcin Krzysztof Porwit    2005,
 *  Copyright (C) Brian Moran                2005,
 *  Copyright (C) Gerald (Jerry) Carter      2005.
 *  Copyright (C) Guenther Deschner          2009.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "includes.h"
#include "system/passwd.h" /* uid_wrapper */
#include "ntdomain.h"
#include "lib/eventlog/eventlog.h"
#include "../libcli/security/security.h"
#include "../librpc/gen_ndr/ndr_winreg_c.h"
#include "rpc_client/cli_winreg_int.h"
#include "rpc_client/cli_winreg.h"
#include "smbd/smbd.h"
#include "auth.h"
#include "util_tdb.h"

#include "rpc_server/rpc_server.h"
#include "librpc/rpc/dcesrv_core.h"
#include "librpc/gen_ndr/ndr_eventlog_scompat.h"
#include "rpc_server/eventlog/srv_eventlog_reg.h"
#include "lib/global_contexts.h"

#undef  DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV

#define TOP_LEVEL_EVENTLOG_KEY "SYSTEM\\CurrentControlSet\\Services\\Eventlog"

typedef struct {
	char *logname;
	ELOG_TDB *etdb;
	uint32_t current_record;
	uint32_t num_records;
	uint32_t oldest_entry;
	uint32_t flags;
	uint32_t access_granted;
} EVENTLOG_INFO;

/********************************************************************
 ********************************************************************/

static int eventlog_info_destructor(EVENTLOG_INFO *elog)
{
	if (elog->etdb) {
		elog_close_tdb(elog->etdb, false);
	}
	return 0;
}

/********************************************************************
 ********************************************************************/

static EVENTLOG_INFO *find_eventlog_info_by_hnd( struct pipes_struct * p,
						struct policy_handle * handle )
{
	EVENTLOG_INFO *info;
	NTSTATUS status;

	info = find_policy_by_hnd(p,
				  handle,
				  DCESRV_HANDLE_ANY,
				  EVENTLOG_INFO,
				  &status);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG( 2,
		       ( "find_eventlog_info_by_hnd: eventlog not found.\n" ) );
		return NULL;
	}

	return info;
}

/********************************************************************
 Pull the NT ACL from a file on disk or the OpenEventlog() access
 check.  Caller is responsible for freeing the returned security
 descriptor via TALLOC_FREE().  This is designed for dealing with
 user space access checks in smbd outside of the VFS.  For example,
 checking access rights in OpenEventlog() or from python.

********************************************************************/

static NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx,
			    struct auth_session_info *session_info,
			    const char *fname,
				uint32_t security_info_wanted,
				struct security_descriptor **sd)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct conn_struct_tos *c = NULL;
	NTSTATUS status = NT_STATUS_OK;
	struct smb_filename *pathref_fname = NULL;

	if (!posix_locking_init(false)) {
		TALLOC_FREE(frame);
		return NT_STATUS_NO_MEMORY;
	}

	status = create_conn_struct_tos(global_messaging_context(),
					-1,
					"/",
					session_info,
					&c);
	if (!NT_STATUS_IS_OK(status)) {
		DBG_ERR("create_conn_struct_tos() returned %s.\n",
			nt_errstr(status));
		TALLOC_FREE(frame);
		return status;
	}

	status = synthetic_pathref(talloc_tos(),
				c->conn->cwd_fsp,
				fname,
				NULL,
				NULL,
				0,
				0,
				&pathref_fname);
	if (!NT_STATUS_IS_OK(status)) {
		DBG_ERR("synthetic_pathref for file %s returned %s.\n",
			  fname, nt_errstr(status));
		TALLOC_FREE(frame);
		return status;
	}
	status = SMB_VFS_FGET_NT_ACL(pathref_fname->fsp,
				security_info_wanted,
				ctx,
				sd);
	if (!NT_STATUS_IS_OK(status)) {
		DBG_ERR("SMB_VFS_FGET_NT_ACL for file %s returned %s.\n",
			  fname, nt_errstr(status));
	}

	TALLOC_FREE(frame);

	return status;
}

/********************************************************************
********************************************************************/

static bool elog_check_access(EVENTLOG_INFO *info,
			      struct auth_session_info *session_info)
{
	const struct security_token *token = session_info->security_token;
	char *tdbname = elog_tdbname(talloc_tos(), info->logname );
	struct security_descriptor *sec_desc;
	struct security_ace *ace;
	NTSTATUS status;

	if ( !tdbname )
		return False;

	/* get the security descriptor for the file */

	status = get_nt_acl_no_snum( info,
			session_info,
			tdbname,
			SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL,
			&sec_desc);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(5,("elog_check_access: Unable to get NT ACL for %s: %s\n",
			tdbname, nt_errstr(status)));
		TALLOC_FREE(tdbname);
		return False;
	}
	TALLOC_FREE(tdbname);

	ace = talloc_zero(sec_desc, struct security_ace);
	if (ace == NULL) {
		TALLOC_FREE(sec_desc);
		return false;
	}

	ace->type		= SEC_ACE_TYPE_ACCESS_ALLOWED;
	ace->flags		= 0;
	ace->access_mask	= REG_KEY_ALL;
	ace->trustee		= global_sid_System;

	status = security_descriptor_dacl_add(sec_desc, ace);
	if (!NT_STATUS_IS_OK(status)) {
		TALLOC_FREE(sec_desc);
		return false;
	}

	/* root free pass */

	if ( geteuid() == sec_initial_uid() ) {
		DEBUG(5,("elog_check_access: running as root, using system token\n"));
		token = get_system_token();
	}

	/* run the check, try for the max allowed */

	status = se_access_check( sec_desc, token, MAXIMUM_ALLOWED_ACCESS,
		&info->access_granted);

	TALLOC_FREE(sec_desc);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(8,("elog_check_access: se_access_check() return %s\n",
			nt_errstr(status)));
		return False;
	}

	/* we have to have READ permission for a successful open */

	return ( info->access_granted & SEC_FILE_READ_DATA );
}

/********************************************************************
 ********************************************************************/

static bool elog_validate_logname( const char *name )
{
	int i;
	const char **elogs = lp_eventlog_list();

	if (!elogs) {
		return False;
	}

	for ( i=0; elogs[i]; i++ ) {
		if ( strequal( name, elogs[i] ) )
			return True;
	}

	return False;
}

/********************************************************************
********************************************************************/

static bool get_num_records_hook( EVENTLOG_INFO * info )
{
	int next_record;
	int oldest_record;

	if ( !info->etdb ) {
		DEBUG( 10, ( "No open tdb for %s\n", info->logname ) );
		return False;
	}

	/* lock the tdb since we have to get 2 records */

	tdb_lock_bystring_with_timeout( ELOG_TDB_CTX(info->etdb), EVT_NEXT_RECORD, 1 );
	next_record = tdb_fetch_int32( ELOG_TDB_CTX(info->etdb), EVT_NEXT_RECORD);
	oldest_record = tdb_fetch_int32( ELOG_TDB_CTX(info->etdb), EVT_OLDEST_ENTRY);
	tdb_unlock_bystring( ELOG_TDB_CTX(info->etdb), EVT_NEXT_RECORD);

	DEBUG( 8,
	       ( "Oldest Record %d; Next Record %d\n", oldest_record,
		 next_record ) );

	info->num_records = ( next_record - oldest_record );
	info->oldest_entry = oldest_record;

	return True;
}

/********************************************************************
 ********************************************************************/

static bool get_oldest_entry_hook( EVENTLOG_INFO * info )
{
	/* it's the same thing */
	return get_num_records_hook( info );
}

/********************************************************************
 ********************************************************************/

static NTSTATUS elog_open( struct pipes_struct * p, const char *logname, struct policy_handle *hnd )
{
	struct dcesrv_call_state *dce_call = p->dce_call;
	struct auth_session_info *session_info =
		dcesrv_call_session_info(dce_call);
	EVENTLOG_INFO *elog;

	/* first thing is to validate the eventlog name */

	if ( !elog_validate_logname( logname ) )
		return NT_STATUS_OBJECT_PATH_INVALID;

	if ( !(elog = talloc_zero( NULL, EVENTLOG_INFO )) )
		return NT_STATUS_NO_MEMORY;
	talloc_set_destructor(elog, eventlog_info_destructor);

	elog->logname = talloc_strdup( elog, logname );

	/* Open the tdb first (so that we can create any new tdbs if necessary).
	   We have to do this as root and then use an internal access check
	   on the file permissions since you can only have a tdb open once
	   in a single process */

	become_root();
	elog->etdb = elog_open_tdb( elog->logname, False, False );
	unbecome_root();

	if ( !elog->etdb ) {
		/* according to MSDN, if the logfile cannot be found, we should
		  default to the "Application" log */

		if ( !strequal( logname, ELOG_APPL ) ) {

			TALLOC_FREE( elog->logname );

			elog->logname = talloc_strdup( elog, ELOG_APPL );

			/* do the access check */
			if ( !elog_check_access( elog, session_info) ) {
				TALLOC_FREE( elog );
				return NT_STATUS_ACCESS_DENIED;
			}

			become_root();
			elog->etdb = elog_open_tdb( elog->logname, False, False );
			unbecome_root();
		}

		if ( !elog->etdb ) {
			TALLOC_FREE( elog );
			return NT_STATUS_ACCESS_DENIED;	/* ??? */
		}
	}

	/* now do the access check.  Close the tdb if we fail here */

	if ( !elog_check_access( elog, session_info) ) {
		TALLOC_FREE( elog );
		return NT_STATUS_ACCESS_DENIED;
	}

	/* create the policy handle */

	if ( !create_policy_hnd( p, hnd, 0, elog ) ) {
		TALLOC_FREE(elog);
		return NT_STATUS_NO_MEMORY;
	}

	/* set the initial current_record pointer */

	if ( !get_oldest_entry_hook( elog ) ) {
		DEBUG(3,("elog_open: Successfully opened eventlog but can't "
			"get any information on internal records!\n"));
	}

	elog->current_record = elog->oldest_entry;

	return NT_STATUS_OK;
}

/********************************************************************
 ********************************************************************/

static NTSTATUS elog_close( struct pipes_struct *p, struct policy_handle *hnd )
{
        if ( !( close_policy_hnd( p, hnd ) ) ) {
                return NT_STATUS_INVALID_HANDLE;
        }

	return NT_STATUS_OK;
}

/*******************************************************************
 *******************************************************************/

static int elog_size( EVENTLOG_INFO *info )
{
	if ( !info || !info->etdb ) {
		DEBUG(0,("elog_size: Invalid info* structure!\n"));
		return 0;
	}

	return elog_tdb_size( ELOG_TDB_CTX(info->etdb), NULL, NULL );
}

/********************************************************************
 note that this can only be called AFTER the table is constructed,
 since it uses the table to find the tdb handle
 ********************************************************************/

static bool sync_eventlog_params(TALLOC_CTX *mem_ctx,
				 struct messaging_context *msg_ctx,
				 EVENTLOG_INFO *info)
{
	struct dcerpc_binding_handle *h = NULL;
	uint32_t access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
	struct policy_handle hive_hnd, key_hnd;
	uint32_t uiMaxSize = 0;
	uint32_t uiRetention = 0;
	char *path = NULL;
	NTSTATUS status;
	WERROR wresult = WERR_OK;
	char *elogname = info->logname;
	TALLOC_CTX *ctx;
	bool ret = false;

	ctx = talloc_stackframe();
	if (ctx == NULL) {
		return false;
	}

	DEBUG( 4, ( "sync_eventlog_params with %s\n", elogname ) );

	if ( !info->etdb ) {
		DEBUG( 4, ( "No open tdb! (%s)\n", info->logname ) );
		goto done;
	}
	/* set reasonable defaults.  512Kb on size and 1 week on time */

	uiMaxSize = 0x80000;
	uiRetention = 604800;

	/* the general idea is to internally open the registry
	   key and retrieve the values.  That way we can continue
	   to use the same fetch/store api that we use in
	   srv_reg_nt.c */
	path = talloc_asprintf(ctx, "%s\\%s", TOP_LEVEL_EVENTLOG_KEY, elogname);
	if (!path) {
		goto done;
	}

	status = dcerpc_winreg_int_hklm_openkey(ctx,
						get_session_info_system(),
						msg_ctx,
						&h,
						path,
						false,
						access_mask,
						&hive_hnd,
						&key_hnd,
						&wresult);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(4,("sync_eventlog_params: Failed to open key [%s] (%s)\n",
			 path, nt_errstr(status)));
		goto done;
	}
	if ( !W_ERROR_IS_OK( wresult ) ) {
		DEBUG( 4,
		       ( "sync_eventlog_params: Failed to open key [%s] (%s)\n",
			 path, win_errstr( wresult ) ) );
		goto done;
	}

	status = dcerpc_winreg_query_dword(ctx,
					   h,
					   &key_hnd,
					   "Retention",
					   &uiRetention,
					   &wresult);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(4, ("Failed to query value \"Retention\": %s\n",
			  nt_errstr(status)));
		goto done;
	}
	if (!W_ERROR_IS_OK(wresult)) {
		DEBUG(4, ("Failed to query value \"Retention\": %s\n",
			  win_errstr(wresult)));
		goto done;
	}

	status = dcerpc_winreg_query_dword(ctx,
					   h,
					   &key_hnd,
					   "MaxSize",
					   &uiMaxSize,
					   &wresult);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(4, ("Failed to query value \"Retention\": %s\n",
			  nt_errstr(status)));
		goto done;
	}
	if (!W_ERROR_IS_OK(wresult)) {
		DEBUG(4, ("Failed to query value \"MaxSize\": %s\n",
			  win_errstr(wresult)));
		goto done;
	}

	tdb_store_int32( ELOG_TDB_CTX(info->etdb), EVT_MAXSIZE, uiMaxSize );
	tdb_store_int32( ELOG_TDB_CTX(info->etdb), EVT_RETENTION, uiRetention );

	ret = true;

done:
	if (h != NULL) {
		WERROR ignore;

		if (is_valid_policy_hnd(&key_hnd)) {
			dcerpc_winreg_CloseKey(h, ctx, &key_hnd, &ignore);
		}
		if (is_valid_policy_hnd(&hive_hnd)) {
			dcerpc_winreg_CloseKey(h, ctx, &hive_hnd, &ignore);
		}
	}

	TALLOC_FREE(ctx);
	return ret;
}

/********************************************************************
 _eventlog_OpenEventLogW
 ********************************************************************/

NTSTATUS _eventlog_OpenEventLogW(struct pipes_struct *p,
				 struct eventlog_OpenEventLogW *r)
{
	EVENTLOG_INFO *info;
	NTSTATUS result;

	DEBUG( 10,("_eventlog_OpenEventLogW: Server [%s], Log [%s]\n",
		r->in.servername->string, r->in.logname->string ));

	/* according to MSDN, if the logfile cannot be found, we should
	  default to the "Application" log */

	if ( !NT_STATUS_IS_OK( result = elog_open( p, r->in.logname->string, r->out.handle )) )
		return result;

	if ( !(info = find_eventlog_info_by_hnd( p, r->out.handle )) ) {
		DEBUG(0,("_eventlog_OpenEventLogW: eventlog (%s) opened but unable to find handle!\n",
			r->in.logname->string ));
		elog_close( p, r->out.handle );
		return NT_STATUS_INVALID_HANDLE;
	}

	DEBUG(10,("_eventlog_OpenEventLogW: Size [%d]\n", elog_size( info )));

	if (!sync_eventlog_params(p->mem_ctx,
				  p->msg_ctx,
				  info)) {
		elog_close(p, r->out.handle);
		return NT_STATUS_EVENTLOG_FILE_CORRUPT;
	}
	prune_eventlog( ELOG_TDB_CTX(info->etdb) );

	return NT_STATUS_OK;
}

/********************************************************************
 _eventlog_ClearEventLogW
 This call still needs some work
 ********************************************************************/
/** The windows client seems to be doing something funny with the file name
   A call like
      ClearEventLog(handle, "backup_file")
   on the client side will result in the backup file name looking like this on the
   server side:
      \??\${CWD of client}\backup_file
   If an absolute path gets specified, such as
      ClearEventLog(handle, "C:\\temp\\backup_file")
   then it is still mangled by the client into this:
      \??\C:\temp\backup_file
   when it is on the wire.
   I'm not sure where the \?? is coming from, or why the ${CWD} of the client process
   would be added in given that the backup file gets written on the server side. */

NTSTATUS _eventlog_ClearEventLogW(struct pipes_struct *p,
				  struct eventlog_ClearEventLogW *r)
{
	EVENTLOG_INFO *info = find_eventlog_info_by_hnd( p, r->in.handle );

	if ( !info )
		return NT_STATUS_INVALID_HANDLE;

	if (r->in.backupfile && r->in.backupfile->string) {

		DEBUG(8,( "_eventlog_ClearEventLogW: Using [%s] as the backup "
			"file name for log [%s].\n",
			 r->in.backupfile->string, info->logname ) );
	}

	/* check for WRITE access to the file */

	if ( !(info->access_granted & SEC_FILE_WRITE_DATA) )
		return NT_STATUS_ACCESS_DENIED;

	/* Force a close and reopen */

	elog_close_tdb( info->etdb, True );
	become_root();
	info->etdb = elog_open_tdb( info->logname, True, False );
	unbecome_root();

	if ( !info->etdb )
		return NT_STATUS_ACCESS_DENIED;

	return NT_STATUS_OK;
}

/********************************************************************
 _eventlog_CloseEventLog
 ********************************************************************/

NTSTATUS _eventlog_CloseEventLog(struct pipes_struct * p,
				 struct eventlog_CloseEventLog *r)
{
	NTSTATUS status;

	status = elog_close( p, r->in.handle );
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	ZERO_STRUCTP(r->out.handle);

	return NT_STATUS_OK;
}

/********************************************************************
 _eventlog_ReadEventLogW
 ********************************************************************/

NTSTATUS _eventlog_ReadEventLogW(struct pipes_struct *p,
				 struct eventlog_ReadEventLogW *r)
{
	EVENTLOG_INFO *info = find_eventlog_info_by_hnd( p, r->in.handle );
	int bytes_left, record_number;
	uint32_t elog_read_type, elog_read_dir;

	if (!info) {
		return NT_STATUS_INVALID_HANDLE;
	}

	info->flags	= r->in.flags;
	bytes_left	= r->in.number_of_bytes;

	if (!info->etdb) {
		return NT_STATUS_ACCESS_DENIED;
	}

	/* check for valid flags.  Can't use the sequential and seek flags together */

	elog_read_type = r->in.flags & (EVENTLOG_SEQUENTIAL_READ|EVENTLOG_SEEK_READ);
	elog_read_dir  = r->in.flags & (EVENTLOG_FORWARDS_READ|EVENTLOG_BACKWARDS_READ);

	if (r->in.flags == 0 ||
	    elog_read_type == (EVENTLOG_SEQUENTIAL_READ|EVENTLOG_SEEK_READ) ||
	    elog_read_dir == (EVENTLOG_FORWARDS_READ|EVENTLOG_BACKWARDS_READ))
	{
		DEBUG(3,("_eventlog_ReadEventLogW: "
			"Invalid flags [0x%08x] for ReadEventLog\n",
			r->in.flags));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* a sequential read should ignore the offset */

	if (elog_read_type & EVENTLOG_SEQUENTIAL_READ) {
		record_number = info->current_record;
	} else {
		record_number = r->in.offset;
	}

	if (r->in.number_of_bytes == 0) {
		struct EVENTLOGRECORD *e;
		e = evlog_pull_record(p->mem_ctx, ELOG_TDB_CTX(info->etdb),
				      record_number);
		if (!e) {
			return NT_STATUS_END_OF_FILE;
		}
		*r->out.real_size = e->Length;
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	while (bytes_left > 0) {

		DATA_BLOB blob;
		enum ndr_err_code ndr_err;
		struct EVENTLOGRECORD *e;

		e = evlog_pull_record(p->mem_ctx, ELOG_TDB_CTX(info->etdb),
				      record_number);
		if (!e) {
			break;
		}

		ndr_err = ndr_push_struct_blob(&blob, p->mem_ctx, e,
			      (ndr_push_flags_fn_t)ndr_push_EVENTLOGRECORD);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			return ndr_map_error2ntstatus(ndr_err);
		}

		if (DEBUGLEVEL >= 10) {
			NDR_PRINT_DEBUG(EVENTLOGRECORD, e);
		}

		if (blob.length > r->in.number_of_bytes) {
			*r->out.real_size = blob.length;
			return NT_STATUS_BUFFER_TOO_SMALL;
		}

		if (*r->out.sent_size + blob.length > r->in.number_of_bytes) {
			break;
		}

		bytes_left -= blob.length;

		if (info->flags & EVENTLOG_FORWARDS_READ) {
			record_number++;
		} else {
			record_number--;
		}

		/* update the eventlog record pointer */

		info->current_record = record_number;

		memcpy(&r->out.data[*(r->out.sent_size)],
		       blob.data, blob.length);
		*(r->out.sent_size) += blob.length;
	}

	if (r->in.offset == 0 && record_number == 0 && *r->out.sent_size == 0) {
		return NT_STATUS_END_OF_FILE;
	}

	return NT_STATUS_OK;
}

/********************************************************************
 _eventlog_GetOldestRecord
 ********************************************************************/

NTSTATUS _eventlog_GetOldestRecord(struct pipes_struct *p,
				   struct eventlog_GetOldestRecord *r)
{
	EVENTLOG_INFO *info = find_eventlog_info_by_hnd( p, r->in.handle );

	if (info == NULL) {
		return NT_STATUS_INVALID_HANDLE;
	}

	if ( !( get_oldest_entry_hook( info ) ) )
		return NT_STATUS_ACCESS_DENIED;

	*r->out.oldest_entry = info->oldest_entry;

	return NT_STATUS_OK;
}

/********************************************************************
_eventlog_GetNumRecords
 ********************************************************************/

NTSTATUS _eventlog_GetNumRecords(struct pipes_struct *p,
				 struct eventlog_GetNumRecords *r)
{
	EVENTLOG_INFO *info = find_eventlog_info_by_hnd( p, r->in.handle );

	if (info == NULL) {
		return NT_STATUS_INVALID_HANDLE;
	}

	if ( !( get_num_records_hook( info ) ) )
		return NT_STATUS_ACCESS_DENIED;

	*r->out.number = info->num_records;

	return NT_STATUS_OK;
}

NTSTATUS _eventlog_BackupEventLogW(struct pipes_struct *p, struct eventlog_BackupEventLogW *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

/********************************************************************
_eventlog_GetLogInformation
 ********************************************************************/

NTSTATUS _eventlog_GetLogInformation(struct pipes_struct *p,
				     struct eventlog_GetLogInformation *r)
{
	EVENTLOG_INFO *info = find_eventlog_info_by_hnd(p, r->in.handle);
	struct EVENTLOG_FULL_INFORMATION f;
	enum ndr_err_code ndr_err;
	DATA_BLOB blob;

	if (!info) {
		return NT_STATUS_INVALID_HANDLE;
	}

	if (r->in.level != 0) {
		return NT_STATUS_INVALID_LEVEL;
	}

	*r->out.bytes_needed = 4;

	if (r->in.buf_size < 4) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	/* FIXME: this should be retrieved from the handle */
	f.full = false;

	ndr_err = ndr_push_struct_blob(&blob, p->mem_ctx, &f,
		      (ndr_push_flags_fn_t)ndr_push_EVENTLOG_FULL_INFORMATION);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		return ndr_map_error2ntstatus(ndr_err);
	}

	if (DEBUGLEVEL >= 10) {
		NDR_PRINT_DEBUG(EVENTLOG_FULL_INFORMATION, &f);
	}

	memcpy(r->out.buffer, blob.data, 4);

	return NT_STATUS_OK;
}

/********************************************************************
_eventlog_FlushEventLog
 ********************************************************************/

NTSTATUS _eventlog_FlushEventLog(struct pipes_struct *p,
				 struct eventlog_FlushEventLog *r)
{
	EVENTLOG_INFO *info = find_eventlog_info_by_hnd(p, r->in.handle);
	if (!info) {
		return NT_STATUS_INVALID_HANDLE;
	}

	return NT_STATUS_ACCESS_DENIED;
}

/********************************************************************
 ********************************************************************/

static NTSTATUS evlog_report_to_record(TALLOC_CTX *mem_ctx,
				       const struct eventlog_ReportEventW *r,
				       const char *logname,
				       struct EVENTLOGRECORD *e)
{
	uint32_t i;
	ZERO_STRUCTP(e);

	e->TimeGenerated	= r->in.timestamp;
	e->TimeWritten		= time(NULL);
	e->EventID		= r->in.event_id;
	e->EventType		= r->in.event_type;
	e->NumStrings		= r->in.num_of_strings;
	e->EventCategory	= r->in.event_category;
	e->ReservedFlags	= r->in.flags;
	e->DataLength		= r->in.data_size;
	e->SourceName		= talloc_strdup(mem_ctx, logname);
	NT_STATUS_HAVE_NO_MEMORY(e->SourceName);
	if (r->in.servername->string) {
		e->Computername	= r->in.servername->string;
	} else {
		e->Computername	= talloc_strdup(mem_ctx, "");
		NT_STATUS_HAVE_NO_MEMORY(e->Computername);
	}
	if (r->in.user_sid) {
		e->UserSid	= *r->in.user_sid;
	}
	e->Strings		= talloc_array(mem_ctx, const char *, e->NumStrings);
	NT_STATUS_HAVE_NO_MEMORY(e->Strings);

	for (i=0; i < e->NumStrings; i++) {
		e->Strings[i] = talloc_strdup(e->Strings,
					      r->in.strings[i]->string);
		NT_STATUS_HAVE_NO_MEMORY(e->Strings[i]);
	}
	e->Data			= r->in.data;

	return NT_STATUS_OK;
}

/********************************************************************
_eventlog_ReportEventW
 ********************************************************************/

NTSTATUS _eventlog_ReportEventW(struct pipes_struct *p,
				struct eventlog_ReportEventW *r)
{
	NTSTATUS status;
	struct EVENTLOGRECORD record;

	EVENTLOG_INFO *info = find_eventlog_info_by_hnd(p, r->in.handle);
	if (!info) {
		return NT_STATUS_INVALID_HANDLE;
	}

	status = evlog_report_to_record(p->mem_ctx, r, info->logname, &record);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	status = evlog_push_record(p->mem_ctx,
				   ELOG_TDB_CTX(info->etdb),
				   &record,
				   r->out.record_number);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	return NT_STATUS_OK;
}

/********************************************************************
 ********************************************************************/

NTSTATUS _eventlog_DeregisterEventSource(struct pipes_struct *p,
					 struct eventlog_DeregisterEventSource *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_ChangeNotify(struct pipes_struct *p,
				struct eventlog_ChangeNotify *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_RegisterEventSourceW(struct pipes_struct *p,
					struct eventlog_RegisterEventSourceW *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_OpenBackupEventLogW(struct pipes_struct *p,
				       struct eventlog_OpenBackupEventLogW *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_ClearEventLogA(struct pipes_struct *p,
				  struct eventlog_ClearEventLogA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_BackupEventLogA(struct pipes_struct *p,
				   struct eventlog_BackupEventLogA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_OpenEventLogA(struct pipes_struct *p,
				 struct eventlog_OpenEventLogA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_RegisterEventSourceA(struct pipes_struct *p,
					struct eventlog_RegisterEventSourceA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_OpenBackupEventLogA(struct pipes_struct *p,
				       struct eventlog_OpenBackupEventLogA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_ReadEventLogA(struct pipes_struct *p,
				 struct eventlog_ReadEventLogA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_ReportEventA(struct pipes_struct *p,
				struct eventlog_ReportEventA *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_RegisterClusterSvc(struct pipes_struct *p,
				      struct eventlog_RegisterClusterSvc *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_DeregisterClusterSvc(struct pipes_struct *p,
					struct eventlog_DeregisterClusterSvc *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_WriteClusterEvents(struct pipes_struct *p,
				      struct eventlog_WriteClusterEvents *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

NTSTATUS _eventlog_ReportEventAndSourceW(struct pipes_struct *p,
					 struct eventlog_ReportEventAndSourceW *r)
{
	p->fault_state = DCERPC_FAULT_OP_RNG_ERROR;
	return NT_STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS eventlog__op_init_server(struct dcesrv_context *dce_ctx,
		const struct dcesrv_endpoint_server *ep_server);

#define DCESRV_INTERFACE_EVENTLOG_INIT_SERVER \
	eventlog_init_server

static NTSTATUS eventlog_init_server(struct dcesrv_context *dce_ctx,
		const struct dcesrv_endpoint_server *ep_server)
{
	struct messaging_context *msg_ctx = global_messaging_context();
	bool ok;

	ok = eventlog_init_winreg(msg_ctx);
	if (!ok) {
		return NT_STATUS_UNSUCCESSFUL;
	}

	return eventlog__op_init_server(dce_ctx, ep_server);
}

/* include the generated boilerplate */
#include "librpc/gen_ndr/ndr_eventlog_scompat.c"