summaryrefslogtreecommitdiff
path: root/source4/rpc_parse/parse_sec.c
blob: dbd72e52504f38ec16287eff88147334a06aae93 (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
/* 
 *  Unix SMB/Netbios implementation.
 *  Version 1.9.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-1998,
 *  Copyright (C) Jeremy R. Allison            1995-1998
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
 *  Copyright (C) Paul Ashton                  1997-1998.
 *  
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "includes.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_PARSE

/*******************************************************************
 Sets up a SEC_ACCESS structure.
********************************************************************/

void init_sec_access(SEC_ACCESS *t, uint32 mask)
{
	t->mask = mask;
}

/*******************************************************************
 Reads or writes a SEC_ACCESS structure.
********************************************************************/

BOOL sec_io_access(const char *desc, SEC_ACCESS *t, prs_struct *ps, int depth)
{
	if (t == NULL)
		return False;

	prs_debug(ps, depth, desc, "sec_io_access");
	depth++;
	
	if(!prs_uint32("mask", ps, depth, &(t->mask)))
		return False;

	return True;
}

/*******************************************************************
 Check if ACE has OBJECT type.
********************************************************************/

BOOL sec_ace_object(uint8 type)
{
	if (type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
            type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
            type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
            type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
		return True;
	}
	return False;
}

/*******************************************************************
 copy a SEC_ACE structure.
********************************************************************/
void sec_ace_copy(SEC_ACE *ace_dest, SEC_ACE *ace_src)
{
	ace_dest->type  = ace_src->type;
	ace_dest->flags = ace_src->flags;
	ace_dest->size  = ace_src->size;
	ace_dest->info.mask = ace_src->info.mask;
	ace_dest->obj_flags = ace_src->obj_flags;
	memcpy(&ace_dest->obj_guid, &ace_src->obj_guid, GUID_SIZE);
	memcpy(&ace_dest->inh_guid, &ace_src->inh_guid, GUID_SIZE);	
	sid_copy(&ace_dest->trustee, &ace_src->trustee);
}

/*******************************************************************
 Sets up a SEC_ACE structure.
********************************************************************/

void init_sec_ace(SEC_ACE *t, DOM_SID *sid, uint8 type, SEC_ACCESS mask, uint8 flag)
{
	t->type = type;
	t->flags = flag;
	t->size = sid_size(sid) + 8;
	t->info = mask;

	ZERO_STRUCTP(&t->trustee);
	sid_copy(&t->trustee, sid);
}

/*******************************************************************
 Reads or writes a SEC_ACE structure.
********************************************************************/

BOOL sec_io_ace(const char *desc, SEC_ACE *psa, prs_struct *ps, int depth)
{
	uint32 old_offset;
	uint32 offset_ace_size;

	if (psa == NULL)
		return False;

	prs_debug(ps, depth, desc, "sec_io_ace");
	depth++;
	
	old_offset = prs_offset(ps);

	if(!prs_uint8("type ", ps, depth, &psa->type))
		return False;

	if(!prs_uint8("flags", ps, depth, &psa->flags))
		return False;

	if(!prs_uint16_pre("size ", ps, depth, &psa->size, &offset_ace_size))
		return False;

	if(!sec_io_access("info ", &psa->info, ps, depth))
		return False;

	/* check whether object access is present */
	if (!sec_ace_object(psa->type)) {
		if (!smb_io_dom_sid("trustee  ", &psa->trustee , ps, depth))
			return False;
	} else {
		if (!prs_uint32("obj_flags", ps, depth, &psa->obj_flags))
			return False;

		if (psa->obj_flags & SEC_ACE_OBJECT_PRESENT)
			if (!prs_uint8s(False, "obj_guid", ps, depth, psa->obj_guid.info, GUID_SIZE))
				return False;

		if (psa->obj_flags & SEC_ACE_OBJECT_INHERITED_PRESENT)
			if (!prs_uint8s(False, "inh_guid", ps, depth, psa->inh_guid.info, GUID_SIZE))
				return False;

		if(!smb_io_dom_sid("trustee  ", &psa->trustee , ps, depth))
			return False;
	}

	if(!prs_uint16_post("size ", ps, depth, &psa->size, offset_ace_size, old_offset))
		return False;
	return True;
}

/*******************************************************************
 adds new SID with its permissions to ACE list
********************************************************************/

NTSTATUS sec_ace_add_sid(TALLOC_CTX *ctx, SEC_ACE **new, SEC_ACE *old, unsigned *num, DOM_SID *sid, uint32 mask)
{
	int i = 0;
	
	if (!ctx || !new || !old || !sid || !num)  return NT_STATUS_INVALID_PARAMETER;

	*num += 1;
	
	if((new[0] = (SEC_ACE *) talloc_zero(ctx, (*num) * sizeof(SEC_ACE))) == 0)
		return NT_STATUS_NO_MEMORY;

	for (i = 0; i < *num - 1; i ++)
		sec_ace_copy(&(*new)[i], &old[i]);

	(*new)[i].type  = 0;
	(*new)[i].flags = 0;
	(*new)[i].size  = SEC_ACE_HEADER_SIZE + sid_size(sid);
	(*new)[i].info.mask = mask;
	sid_copy(&(*new)[i].trustee, sid);
	return NT_STATUS_OK;
}

/*******************************************************************
  modify SID's permissions at ACL 
********************************************************************/

NTSTATUS sec_ace_mod_sid(SEC_ACE *ace, size_t num, DOM_SID *sid, uint32 mask)
{
	int i = 0;

	if (!ace || !sid)  return NT_STATUS_INVALID_PARAMETER;

	for (i = 0; i < num; i ++) {
		if (sid_compare(&ace[i].trustee, sid) == 0) {
			ace[i].info.mask = mask;
			return NT_STATUS_OK;
		}
	}
	return NT_STATUS_NOT_FOUND;
}

/*******************************************************************
 delete SID from ACL
********************************************************************/

NTSTATUS sec_ace_del_sid(TALLOC_CTX *ctx, SEC_ACE **new, SEC_ACE *old, size_t *num, DOM_SID *sid)
{
	int i     = 0;
	int n_del = 0;

	if (!ctx || !new || !old || !sid || !num)  return NT_STATUS_INVALID_PARAMETER;

	if((new[0] = (SEC_ACE *) talloc_zero(ctx, *num * sizeof(SEC_ACE))) == 0)
		return NT_STATUS_NO_MEMORY;

	for (i = 0; i < *num; i ++) {
		if (sid_compare(&old[i].trustee, sid) != 0)
			sec_ace_copy(&(*new)[i], &old[i]);
		else
			n_del ++;
	}
	if (n_del == 0)
		return NT_STATUS_NOT_FOUND;
	else {
		*num -= n_del;
		return NT_STATUS_OK;
	}
}

/*******************************************************************
 Create a SEC_ACL structure.  
********************************************************************/

SEC_ACL *make_sec_acl(TALLOC_CTX *ctx, uint16 revision, int num_aces, SEC_ACE *ace_list)
{
	SEC_ACL *dst;
	int i;

	if((dst = (SEC_ACL *)talloc_zero(ctx,sizeof(SEC_ACL))) == NULL)
		return NULL;

	dst->revision = revision;
	dst->num_aces = num_aces;
	dst->size = SEC_ACL_HEADER_SIZE;

	/* Now we need to return a non-NULL address for the ace list even
	   if the number of aces required is zero.  This is because there
	   is a distinct difference between a NULL ace and an ace with zero
	   entries in it.  This is achieved by checking that num_aces is a
	   positive number. */

	if ((num_aces) && 
            ((dst->ace = (SEC_ACE *)talloc(ctx, sizeof(SEC_ACE) * num_aces)) 
             == NULL)) {
		return NULL;
	}
        
	for (i = 0; i < num_aces; i++) {
		dst->ace[i] = ace_list[i]; /* Structure copy. */
		dst->size += ace_list[i].size;
	}

	return dst;
}

/*******************************************************************
 Duplicate a SEC_ACL structure.  
********************************************************************/

SEC_ACL *dup_sec_acl(TALLOC_CTX *ctx, SEC_ACL *src)
{
	if(src == NULL)
		return NULL;

	return make_sec_acl(ctx, src->revision, src->num_aces, src->ace);
}

/*******************************************************************
 Reads or writes a SEC_ACL structure.  

 First of the xx_io_xx functions that allocates its data structures
 for you as it reads them.
********************************************************************/

BOOL sec_io_acl(const char *desc, SEC_ACL **ppsa, prs_struct *ps, int depth)
{
	int i;
	uint32 old_offset;
	uint32 offset_acl_size;
	SEC_ACL *psa;

	/*
	 * Note that the size is always a multiple of 4 bytes due to the
	 * nature of the data structure.  Therefore the prs_align() calls
	 * have been removed as they through us off when doing two-layer
	 * marshalling such as in the printing code (NEW_BUFFER).  --jerry
	 */

	if (ppsa == NULL)
		return False;

	psa = *ppsa;

	if(UNMARSHALLING(ps) && psa == NULL) {
		/*
		 * This is a read and we must allocate the stuct to read into.
		 */
		if((psa = (SEC_ACL *)prs_alloc_mem(ps, sizeof(SEC_ACL))) == NULL)
			return False;
		*ppsa = psa;
	}

	prs_debug(ps, depth, desc, "sec_io_acl");
	depth++;
	
	old_offset = prs_offset(ps);

	if(!prs_uint16("revision", ps, depth, &psa->revision))
		return False;

	if(!prs_uint16_pre("size     ", ps, depth, &psa->size, &offset_acl_size))
		return False;

	if(!prs_uint32("num_aces ", ps, depth, &psa->num_aces))
		return False;

	if (UNMARSHALLING(ps)) {
		/*
		 * Even if the num_aces is zero, allocate memory as there's a difference
		 * between a non-present DACL (allow all access) and a DACL with no ACE's
		 * (allow no access).
		 */
		if((psa->ace = (SEC_ACE *)prs_alloc_mem(ps,sizeof(psa->ace[0]) * (psa->num_aces+1))) == NULL)
			return False;
	}

	for (i = 0; i < psa->num_aces; i++) {
		fstring tmp;
		slprintf(tmp, sizeof(tmp)-1, "ace_list[%02d]: ", i);
		if(!sec_io_ace(tmp, &psa->ace[i], ps, depth))
			return False;
	}

	if(!prs_uint16_post("size     ", ps, depth, &psa->size, offset_acl_size, old_offset))
		return False;

	return True;
}

/*******************************************************************
 Works out the linearization size of a SEC_DESC.
********************************************************************/

size_t sec_desc_size(SEC_DESC *psd)
{
	size_t offset;

	if (!psd) return 0;

	offset = SEC_DESC_HEADER_SIZE;

	/* don't align */

	if (psd->owner_sid != NULL)
		offset += sid_size(psd->owner_sid);

	if (psd->grp_sid != NULL)
		offset += sid_size(psd->grp_sid);

	if (psd->sacl != NULL)
		offset += psd->sacl->size;

	if (psd->dacl != NULL)
		offset += psd->dacl->size;

	return offset;
}

/*******************************************************************
 Compares two SEC_ACE structures
********************************************************************/

BOOL sec_ace_equal(SEC_ACE *s1, SEC_ACE *s2)
{
	/* Trivial case */

	if (!s1 && !s2) return True;

	/* Check top level stuff */

	if (s1->type != s2->type || s1->flags != s2->flags ||
	    s1->info.mask != s2->info.mask) {
		return False;
	}

	/* Check SID */

	if (!sid_equal(&s1->trustee, &s2->trustee)) {
		return False;
	}

	return True;
}

/*******************************************************************
 Compares two SEC_ACL structures
********************************************************************/

BOOL sec_acl_equal(SEC_ACL *s1, SEC_ACL *s2)
{
	int i, j;

	/* Trivial cases */

	if (!s1 && !s2) return True;
	if (!s1 || !s2) return False;

	/* Check top level stuff */

	if (s1->revision != s2->revision) {
		DEBUG(10, ("sec_acl_equal(): revision differs (%d != %d)\n",
			   s1->revision, s2->revision));
		return False;
	}

	if (s1->num_aces != s2->num_aces) {
		DEBUG(10, ("sec_acl_equal(): num_aces differs (%d != %d)\n",
			   s1->revision, s2->revision));
		return False;
	}

	/* The ACEs could be in any order so check each ACE in s1 against 
	   each ACE in s2. */

	for (i = 0; i < s1->num_aces; i++) {
		BOOL found = False;

		for (j = 0; j < s2->num_aces; j++) {
			if (sec_ace_equal(&s1->ace[i], &s2->ace[j])) {
				found = True;
				break;
			}
		}

		if (!found) return False;
	}

	return True;
}

/*******************************************************************
 Compares two SEC_DESC structures
********************************************************************/

BOOL sec_desc_equal(SEC_DESC *s1, SEC_DESC *s2)
{
	/* Trivial case */

	if (!s1 && !s2) {
		goto done;
	}

	/* Check top level stuff */

	if (s1->revision != s2->revision) {
		DEBUG(10, ("sec_desc_equal(): revision differs (%d != %d)\n",
			   s1->revision, s2->revision));
		return False;
	}

	if (s1->type!= s2->type) {
		DEBUG(10, ("sec_desc_equal(): type differs (%d != %d)\n",
			   s1->type, s2->type));
		return False;
	}

	/* Check owner and group */

	if (!sid_equal(s1->owner_sid, s2->owner_sid)) {
		fstring str1, str2;

		sid_to_string(str1, s1->owner_sid);
		sid_to_string(str2, s2->owner_sid);

		DEBUG(10, ("sec_desc_equal(): owner differs (%s != %s)\n",
			   str1, str2));
		return False;
	}

	if (!sid_equal(s1->grp_sid, s2->grp_sid)) {
		fstring str1, str2;

		sid_to_string(str1, s1->grp_sid);
		sid_to_string(str2, s2->grp_sid);

		DEBUG(10, ("sec_desc_equal(): group differs (%s != %s)\n",
			   str1, str2));
		return False;
	}

	/* Check ACLs present in one but not the other */

	if ((s1->dacl && !s2->dacl) || (!s1->dacl && s2->dacl) ||
	    (s1->sacl && !s2->sacl) || (!s1->sacl && s2->sacl)) {
		DEBUG(10, ("sec_desc_equal(): dacl or sacl not present\n"));
		return False;
	}

	/* Sigh - we have to do it the hard way by iterating over all
	   the ACEs in the ACLs */

	if (!sec_acl_equal(s1->dacl, s2->dacl) ||
	    !sec_acl_equal(s1->sacl, s2->sacl)) {
		DEBUG(10, ("sec_desc_equal(): dacl/sacl list not equal\n"));
		return False;
	}

 done:
	DEBUG(10, ("sec_desc_equal(): secdescs are identical\n"));
	return True;
}

/*******************************************************************
 Merge part of security descriptor old_sec in to the empty sections of 
 security descriptor new_sec.
********************************************************************/

SEC_DESC_BUF *sec_desc_merge(TALLOC_CTX *ctx, SEC_DESC_BUF *new_sdb, SEC_DESC_BUF *old_sdb)
{
	DOM_SID *owner_sid, *group_sid;
	SEC_DESC_BUF *return_sdb;
	SEC_ACL *dacl, *sacl;
	SEC_DESC *psd = NULL;
	uint16 secdesc_type;
	size_t secdesc_size;

	/* Copy over owner and group sids.  There seems to be no flag for
	   this so just check the pointer values. */

	owner_sid = new_sdb->sec->owner_sid ? new_sdb->sec->owner_sid :
		old_sdb->sec->owner_sid;

	group_sid = new_sdb->sec->grp_sid ? new_sdb->sec->grp_sid :
		old_sdb->sec->grp_sid;
	
	secdesc_type = new_sdb->sec->type;

	/* Ignore changes to the system ACL.  This has the effect of making
	   changes through the security tab audit button not sticking. 
	   Perhaps in future Samba could implement these settings somehow. */

	sacl = NULL;
	secdesc_type &= ~SEC_DESC_SACL_PRESENT;

	/* Copy across discretionary ACL */

	if (secdesc_type & SEC_DESC_DACL_PRESENT) {
		dacl = new_sdb->sec->dacl;
	} else {
		dacl = old_sdb->sec->dacl;
	}

	/* Create new security descriptor from bits */

	psd = make_sec_desc(ctx, new_sdb->sec->revision, 
			    owner_sid, group_sid, sacl, dacl, &secdesc_size);

	return_sdb = make_sec_desc_buf(ctx, secdesc_size, psd);

	return(return_sdb);
}

/*******************************************************************
 Tallocs a duplicate SID. 
********************************************************************/ 

static DOM_SID *sid_dup_talloc(TALLOC_CTX *ctx, DOM_SID *src)
{
  DOM_SID *dst;

  if(!src)
    return NULL;

  if((dst = talloc_zero(ctx, sizeof(DOM_SID))) != NULL) {
    sid_copy( dst, src);
  }

  return dst;
}

/*******************************************************************
 Creates a SEC_DESC structure
********************************************************************/

SEC_DESC *make_sec_desc(TALLOC_CTX *ctx, uint16 revision, 
			DOM_SID *owner_sid, DOM_SID *grp_sid,
			SEC_ACL *sacl, SEC_ACL *dacl, size_t *sd_size)
{
	SEC_DESC *dst;
	uint32 offset     = 0;
	uint32 offset_sid = SEC_DESC_HEADER_SIZE;
	uint32 offset_acl = 0;

	*sd_size = 0;

	if(( dst = (SEC_DESC *)talloc_zero(ctx, sizeof(SEC_DESC))) == NULL)
		return NULL;

	dst->revision = revision;
	dst->type     = SEC_DESC_SELF_RELATIVE;

	if (sacl) dst->type |= SEC_DESC_SACL_PRESENT;
	if (dacl) dst->type |= SEC_DESC_DACL_PRESENT;

	dst->off_owner_sid = 0;
	dst->off_grp_sid   = 0;
	dst->off_sacl      = 0;
	dst->off_dacl      = 0;

	if(owner_sid && ((dst->owner_sid = sid_dup_talloc(ctx,owner_sid)) == NULL))
		goto error_exit;

	if(grp_sid && ((dst->grp_sid = sid_dup_talloc(ctx,grp_sid)) == NULL))
		goto error_exit;

	if(sacl && ((dst->sacl = dup_sec_acl(ctx, sacl)) == NULL))
		goto error_exit;

	if(dacl && ((dst->dacl = dup_sec_acl(ctx, dacl)) == NULL))
		goto error_exit;

	offset = 0;

	/*
	 * Work out the linearization sizes.
	 */
	if (dst->owner_sid != NULL) {

		if (offset == 0)
			offset = SEC_DESC_HEADER_SIZE;

		offset += sid_size(dst->owner_sid);
	}

	if (dst->grp_sid != NULL) {

		if (offset == 0)
			offset = SEC_DESC_HEADER_SIZE;

		offset += sid_size(dst->grp_sid);
	}

	if (dst->sacl != NULL) {

		offset_acl = SEC_DESC_HEADER_SIZE;

		dst->off_sacl  = offset_acl;
		offset_acl    += dst->sacl->size;
		offset        += dst->sacl->size;
		offset_sid    += dst->sacl->size;
	}

	if (dst->dacl != NULL) {

		if (offset_acl == 0)
			offset_acl = SEC_DESC_HEADER_SIZE;

		dst->off_dacl  = offset_acl;
		offset_acl    += dst->dacl->size;
		offset        += dst->dacl->size;
		offset_sid    += dst->dacl->size;
	}

	*sd_size = (size_t)((offset == 0) ? SEC_DESC_HEADER_SIZE : offset);

	if (dst->owner_sid != NULL)
		dst->off_owner_sid = offset_sid;
		
	/* sid_size() returns 0 if the sid is NULL so this is ok */
		
	if (dst->grp_sid != NULL)
		dst->off_grp_sid = offset_sid + sid_size(dst->owner_sid);

	return dst;

error_exit:

	*sd_size = 0;
	return NULL;
}

/*******************************************************************
 Duplicate a SEC_DESC structure.  
********************************************************************/

SEC_DESC *dup_sec_desc( TALLOC_CTX *ctx, SEC_DESC *src)
{
	size_t dummy;

	if(src == NULL)
		return NULL;

	return make_sec_desc( ctx, src->revision, 
				src->owner_sid, src->grp_sid, src->sacl,
				src->dacl, &dummy);
}

/*******************************************************************
 Creates a SEC_DESC structure with typical defaults.
********************************************************************/

SEC_DESC *make_standard_sec_desc(TALLOC_CTX *ctx, DOM_SID *owner_sid, DOM_SID *grp_sid,
				 SEC_ACL *dacl, size_t *sd_size)
{
	return make_sec_desc(ctx, SEC_DESC_REVISION,
			     owner_sid, grp_sid, NULL, dacl, sd_size);
}

/*******************************************************************
 Reads or writes a SEC_DESC structure.
 If reading and the *ppsd = NULL, allocates the structure.
********************************************************************/

BOOL sec_io_desc(const char *desc, SEC_DESC **ppsd, prs_struct *ps, int depth)
{
	uint32 old_offset;
	uint32 max_offset = 0; /* after we're done, move offset to end */
	uint32 tmp_offset = 0;
	
	SEC_DESC *psd;

	if (ppsd == NULL)
		return False;

	psd = *ppsd;

	if (psd == NULL) {
		if(UNMARSHALLING(ps)) {
			if((psd = (SEC_DESC *)prs_alloc_mem(ps,sizeof(SEC_DESC))) == NULL)
				return False;
			*ppsd = psd;
		} else {
			/* Marshalling - just ignore. */
			return True;
		}
	}

	prs_debug(ps, depth, desc, "sec_io_desc");
	depth++;

#if 0	
	/*
	 * if alignment is needed, should be done by the the 
	 * caller.  Not here.  This caused me problems when marshalling
	 * printer info into a buffer.   --jerry
	 */
	if(!prs_align(ps))
		return False;
#endif
	
	/* start of security descriptor stored for back-calc offset purposes */
	old_offset = prs_offset(ps);

	if(!prs_uint16("revision ", ps, depth, &psd->revision))
		return False;

	if(!prs_uint16("type     ", ps, depth, &psd->type))
		return False;

	if(!prs_uint32("off_owner_sid", ps, depth, &psd->off_owner_sid))
		return False;

	if(!prs_uint32("off_grp_sid  ", ps, depth, &psd->off_grp_sid))
		return False;

	if(!prs_uint32("off_sacl     ", ps, depth, &psd->off_sacl))
		return False;

	if(!prs_uint32("off_dacl     ", ps, depth, &psd->off_dacl))
		return False;

	max_offset = MAX(max_offset, prs_offset(ps));

	if (psd->off_owner_sid != 0) {

		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + psd->off_owner_sid))
			return False;

		if (UNMARSHALLING(ps)) {
			/* reading */
			if((psd->owner_sid = (DOM_SID *)prs_alloc_mem(ps,sizeof(*psd->owner_sid))) == NULL)
				return False;
		}

		if(!smb_io_dom_sid("owner_sid ", psd->owner_sid , ps, depth))
			return False;

		max_offset = MAX(max_offset, prs_offset(ps));

		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if (psd->off_grp_sid != 0) {

		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + psd->off_grp_sid))
			return False;

		if (UNMARSHALLING(ps)) {
			/* reading */
			if((psd->grp_sid = (DOM_SID *)prs_alloc_mem(ps,sizeof(*psd->grp_sid))) == NULL)
				return False;
		}

		if(!smb_io_dom_sid("grp_sid", psd->grp_sid, ps, depth))
			return False;
			
		max_offset = MAX(max_offset, prs_offset(ps));

		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if ((psd->type & SEC_DESC_SACL_PRESENT) && psd->off_sacl) {
		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + psd->off_sacl))
			return False;
		if(!sec_io_acl("sacl", &psd->sacl, ps, depth))
			return False;
		max_offset = MAX(max_offset, prs_offset(ps));
		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}


	if ((psd->type & SEC_DESC_DACL_PRESENT) && psd->off_dacl != 0) {
		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + psd->off_dacl))
			return False;
		if(!sec_io_acl("dacl", &psd->dacl, ps, depth))
			return False;
		max_offset = MAX(max_offset, prs_offset(ps));
		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if(!prs_set_offset(ps, max_offset))
		return False;
	return True;
}

/*******************************************************************
 Creates a SEC_DESC_BUF structure.
********************************************************************/

SEC_DESC_BUF *make_sec_desc_buf(TALLOC_CTX *ctx, size_t len, SEC_DESC *sec_desc)
{
	SEC_DESC_BUF *dst;

	if((dst = (SEC_DESC_BUF *)talloc_zero(ctx, sizeof(SEC_DESC_BUF))) == NULL)
		return NULL;

	/* max buffer size (allocated size) */
	dst->max_len = (uint32)len;
	dst->len = (uint32)len;
	
	if(sec_desc && ((dst->sec = dup_sec_desc(ctx, sec_desc)) == NULL)) {
		return NULL;
	}

	dst->ptr = 0x1;

	return dst;
}

/*******************************************************************
 Duplicates a SEC_DESC_BUF structure.
********************************************************************/

SEC_DESC_BUF *dup_sec_desc_buf(TALLOC_CTX *ctx, SEC_DESC_BUF *src)
{
	if(src == NULL)
		return NULL;

	return make_sec_desc_buf( ctx, src->len, src->sec);
}

/*******************************************************************
 Reads or writes a SEC_DESC_BUF structure.
********************************************************************/

BOOL sec_io_desc_buf(const char *desc, SEC_DESC_BUF **ppsdb, prs_struct *ps, int depth)
{
	uint32 off_len;
	uint32 off_max_len;
	uint32 old_offset;
	uint32 size;
	SEC_DESC_BUF *psdb;

	if (ppsdb == NULL)
		return False;

	psdb = *ppsdb;

	if (UNMARSHALLING(ps) && psdb == NULL) {
		if((psdb = (SEC_DESC_BUF *)prs_alloc_mem(ps,sizeof(SEC_DESC_BUF))) == NULL)
			return False;
		*ppsdb = psdb;
	}

	prs_debug(ps, depth, desc, "sec_io_desc_buf");
	depth++;

	if(!prs_align(ps))
		return False;
	
	if(!prs_uint32_pre("max_len", ps, depth, &psdb->max_len, &off_max_len))
		return False;

	if(!prs_uint32    ("ptr  ", ps, depth, &psdb->ptr))
		return False;

	if(!prs_uint32_pre("len    ", ps, depth, &psdb->len, &off_len))
		return False;

	old_offset = prs_offset(ps);

	/* reading, length is non-zero; writing, descriptor is non-NULL */
	if ((UNMARSHALLING(ps) && psdb->len != 0) || (MARSHALLING(ps) && psdb->sec != NULL)) {
		if(!sec_io_desc("sec   ", &psdb->sec, ps, depth))
			return False;
	}

	if(!prs_align(ps))
		return False;
	
	size = prs_offset(ps) - old_offset;
	if(!prs_uint32_post("max_len", ps, depth, &psdb->max_len, off_max_len, size == 0 ? psdb->max_len : size))
		return False;

	if(!prs_uint32_post("len    ", ps, depth, &psdb->len, off_len, size))
		return False;

	return True;
}

/*******************************************************************
 adds new SID with its permissions to SEC_DESC
********************************************************************/

NTSTATUS sec_desc_add_sid(TALLOC_CTX *ctx, SEC_DESC **psd, DOM_SID *sid, uint32 mask, size_t *sd_size)
{
	SEC_DESC *sd   = 0;
	SEC_ACL  *dacl = 0;
	SEC_ACE  *ace  = 0;
	NTSTATUS  status;

	*sd_size = 0;

	if (!ctx || !psd || !sid || !sd_size)  return NT_STATUS_INVALID_PARAMETER;

	status = sec_ace_add_sid(ctx, &ace, psd[0]->dacl->ace, &psd[0]->dacl->num_aces, sid, mask);
	
	if (!NT_STATUS_IS_OK(status))
		return status;

	if (!(dacl = make_sec_acl(ctx, psd[0]->dacl->revision, psd[0]->dacl->num_aces, ace)))
		return NT_STATUS_UNSUCCESSFUL;
	
	if (!(sd = make_sec_desc(ctx, psd[0]->revision, psd[0]->owner_sid, 
		psd[0]->grp_sid, psd[0]->sacl, dacl, sd_size)))
		return NT_STATUS_UNSUCCESSFUL;

	*psd = sd;
	 sd  = 0;
	return NT_STATUS_OK;
}

/*******************************************************************
 modify SID's permissions at SEC_DESC
********************************************************************/

NTSTATUS sec_desc_mod_sid(SEC_DESC *sd, DOM_SID *sid, uint32 mask)
{
	NTSTATUS status;

	if (!sd || !sid) return NT_STATUS_INVALID_PARAMETER;

	status = sec_ace_mod_sid(sd->dacl->ace, sd->dacl->num_aces, sid, mask);

	if (!NT_STATUS_IS_OK(status))
		return status;
	
	return NT_STATUS_OK;
}

/*******************************************************************
 delete SID from SEC_DESC
********************************************************************/

NTSTATUS sec_desc_del_sid(TALLOC_CTX *ctx, SEC_DESC **psd, DOM_SID *sid, size_t *sd_size)
{
	SEC_DESC *sd   = 0;
	SEC_ACL  *dacl = 0;
	SEC_ACE  *ace  = 0;
	NTSTATUS  status;

	*sd_size = 0;
	
	if (!ctx || !psd[0] || !sid || !sd_size) return NT_STATUS_INVALID_PARAMETER;

	status = sec_ace_del_sid(ctx, &ace, psd[0]->dacl->ace, &psd[0]->dacl->num_aces, sid);

	if (!NT_STATUS_IS_OK(status))
		return status;

	if (!(dacl = make_sec_acl(ctx, psd[0]->dacl->revision, psd[0]->dacl->num_aces, ace)))
		return NT_STATUS_UNSUCCESSFUL;
	
	if (!(sd = make_sec_desc(ctx, psd[0]->revision, psd[0]->owner_sid, 
		psd[0]->grp_sid, psd[0]->sacl, dacl, sd_size)))
		return NT_STATUS_UNSUCCESSFUL;

	*psd = sd;
	 sd  = 0;
	return NT_STATUS_OK;
}