6b83f9ce6553ea09808538f53b105ca0e4712473
[kai/samba.git] / source3 / lib / util_sid.c
1 /* 
2    Unix SMB/CIFS implementation.
3    Samba utility functions
4    Copyright (C) Andrew Tridgell                1992-1998
5    Copyright (C) Luke Kenneth Caseson Leighton  1998-1999
6    Copyright (C) Jeremy Allison                 1999
7    Copyright (C) Stefan (metze) Metzmacher      2002
8    Copyright (C) Simo Sorce                     2002
9    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2005
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
27 /*
28  * Some useful sids, more well known sids can be found at
29  * http://support.microsoft.com/kb/243330/EN-US/
30  */
31
32
33 const DOM_SID global_sid_World_Domain =               /* Everyone domain */
34 { 1, 0, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
35 const DOM_SID global_sid_World =                      /* Everyone */
36 { 1, 1, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
37 const DOM_SID global_sid_Creator_Owner_Domain =       /* Creator Owner domain */
38 { 1, 0, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
39 const DOM_SID global_sid_NT_Authority =                 /* NT Authority */
40 { 1, 0, {0,0,0,0,0,5}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
41 const DOM_SID global_sid_System =                       /* System */
42 { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
43 const DOM_SID global_sid_NULL =                         /* NULL sid */
44 { 1, 1, {0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
45 const DOM_SID global_sid_Authenticated_Users =  /* All authenticated rids */
46 { 1, 1, {0,0,0,0,0,5}, {11,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
47 #if 0
48 /* for documentation */
49 const DOM_SID global_sid_Restriced =                    /* Restriced Code */
50 { 1, 1, {0,0,0,0,0,5}, {12,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
51 #endif
52 const DOM_SID global_sid_Network =                      /* Network rids */
53 { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
54
55 const DOM_SID global_sid_Creator_Owner =                /* Creator Owner */
56 { 1, 1, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
57 const DOM_SID global_sid_Creator_Group =                /* Creator Group */
58 { 1, 1, {0,0,0,0,0,3}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
59 const DOM_SID global_sid_Anonymous =                    /* Anonymous login */
60 { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
61
62 const DOM_SID global_sid_Builtin =                      /* Local well-known domain */
63 { 1, 1, {0,0,0,0,0,5}, {32,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
64 const DOM_SID global_sid_Builtin_Administrators =       /* Builtin administrators */
65 { 1, 2, {0,0,0,0,0,5}, {32,544,0,0,0,0,0,0,0,0,0,0,0,0,0}};
66 const DOM_SID global_sid_Builtin_Users =                /* Builtin users */
67 { 1, 2, {0,0,0,0,0,5}, {32,545,0,0,0,0,0,0,0,0,0,0,0,0,0}};
68 const DOM_SID global_sid_Builtin_Guests =               /* Builtin guest users */
69 { 1, 2, {0,0,0,0,0,5}, {32,546,0,0,0,0,0,0,0,0,0,0,0,0,0}};
70 const DOM_SID global_sid_Builtin_Power_Users =  /* Builtin power users */
71 { 1, 2, {0,0,0,0,0,5}, {32,547,0,0,0,0,0,0,0,0,0,0,0,0,0}};
72 const DOM_SID global_sid_Builtin_Account_Operators =    /* Builtin account operators */
73 { 1, 2, {0,0,0,0,0,5}, {32,548,0,0,0,0,0,0,0,0,0,0,0,0,0}};
74 const DOM_SID global_sid_Builtin_Server_Operators =     /* Builtin server operators */
75 { 1, 2, {0,0,0,0,0,5}, {32,549,0,0,0,0,0,0,0,0,0,0,0,0,0}};
76 const DOM_SID global_sid_Builtin_Print_Operators =      /* Builtin print operators */
77 { 1, 2, {0,0,0,0,0,5}, {32,550,0,0,0,0,0,0,0,0,0,0,0,0,0}};
78 const DOM_SID global_sid_Builtin_Backup_Operators =     /* Builtin backup operators */
79 { 1, 2, {0,0,0,0,0,5}, {32,551,0,0,0,0,0,0,0,0,0,0,0,0,0}};
80 const DOM_SID global_sid_Builtin_Replicator =           /* Builtin replicator */
81 { 1, 2, {0,0,0,0,0,5}, {32,552,0,0,0,0,0,0,0,0,0,0,0,0,0}};
82 const DOM_SID global_sid_Builtin_PreWin2kAccess =       /* Builtin pre win2k access */
83 { 1, 2, {0,0,0,0,0,5}, {32,554,0,0,0,0,0,0,0,0,0,0,0,0,0}};
84
85 const DOM_SID global_sid_Unix_Users =                   /* Unmapped Unix users */
86 { 1, 1, {0,0,0,0,0,22}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
87 const DOM_SID global_sid_Unix_Groups =                  /* Unmapped Unix groups */
88 { 1, 1, {0,0,0,0,0,22}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
89
90 /* Unused, left here for documentary purposes */
91 #if 0
92 #define SECURITY_NULL_SID_AUTHORITY    0
93 #define SECURITY_WORLD_SID_AUTHORITY   1
94 #define SECURITY_LOCAL_SID_AUTHORITY   2
95 #define SECURITY_CREATOR_SID_AUTHORITY 3
96 #define SECURITY_NT_AUTHORITY          5
97 #endif
98
99 /*
100  * An NT compatible anonymous token.
101  */
102
103 static DOM_SID anon_sid_array[3] =
104 { { 1, 1, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
105   { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
106   { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
107 NT_USER_TOKEN anonymous_token = { 3, anon_sid_array, SE_NONE };
108
109 static DOM_SID system_sid_array[1] =
110 { { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
111 NT_USER_TOKEN system_token = { 1, system_sid_array, SE_ALL_PRIVS };
112
113 /****************************************************************************
114  Lookup string names for SID types.
115 ****************************************************************************/
116
117 static const struct {
118         enum lsa_SidType sid_type;
119         const char *string;
120 } sid_name_type[] = {
121         {SID_NAME_USER, "User"},
122         {SID_NAME_DOM_GRP, "Domain Group"},
123         {SID_NAME_DOMAIN, "Domain"},
124         {SID_NAME_ALIAS, "Local Group"},
125         {SID_NAME_WKN_GRP, "Well-known Group"},
126         {SID_NAME_DELETED, "Deleted Account"},
127         {SID_NAME_INVALID, "Invalid Account"},
128         {SID_NAME_UNKNOWN, "UNKNOWN"},
129         {SID_NAME_COMPUTER, "Computer"},
130
131         {(enum lsa_SidType)0, NULL}
132 };
133
134 const char *sid_type_lookup(uint32 sid_type) 
135 {
136         int i = 0;
137
138         /* Look through list */
139         while(sid_name_type[i].sid_type != 0) {
140                 if (sid_name_type[i].sid_type == sid_type)
141                         return sid_name_type[i].string;
142                 i++;
143         }
144
145         /* Default return */
146         return "SID *TYPE* is INVALID";
147 }
148
149 /**************************************************************************
150  Create the SYSTEM token.
151 ***************************************************************************/
152
153 NT_USER_TOKEN *get_system_token(void) 
154 {
155         return &system_token;
156 }
157
158 /******************************************************************
159  get the default domain/netbios name to be used when dealing 
160  with our passdb list of accounts
161 ******************************************************************/
162
163 const char *get_global_sam_name(void) 
164 {
165         if ((lp_server_role() == ROLE_DOMAIN_PDC) || (lp_server_role() == ROLE_DOMAIN_BDC)) {
166                 return lp_workgroup();
167         }
168         return global_myname();
169 }
170
171 /*****************************************************************
172  Convert a SID to an ascii string.
173 *****************************************************************/
174
175 char *sid_to_fstring(fstring sidstr_out, const DOM_SID *sid)
176 {
177         char *str = sid_string_talloc(talloc_tos(), sid);
178         fstrcpy(sidstr_out, str);
179         TALLOC_FREE(str);
180         return sidstr_out;
181 }
182
183 /*****************************************************************
184  Essentially a renamed dom_sid_string from librpc/ndr with a
185  panic if it didn't work
186
187  This introduces a dependency on librpc/ndr/sid.o which can easily
188  be turned around if necessary
189 *****************************************************************/
190
191 char *sid_string_talloc(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
192 {
193         char *result = dom_sid_string(mem_ctx, sid);
194         SMB_ASSERT(result != NULL);
195         return result;
196 }
197
198 /*****************************************************************
199  Useful function for debug lines.
200 *****************************************************************/
201
202 char *sid_string_dbg(const DOM_SID *sid)
203 {
204         return sid_string_talloc(debug_ctx(), sid);
205 }
206
207 /*****************************************************************
208  Use with care!
209 *****************************************************************/
210
211 char *sid_string_tos(const DOM_SID *sid)
212 {
213         return sid_string_talloc(talloc_tos(), sid);
214 }
215
216 /*****************************************************************
217  Convert a string to a SID. Returns True on success, False on fail.
218 *****************************************************************/  
219    
220 bool string_to_sid(DOM_SID *sidout, const char *sidstr)
221 {
222         const char *p;
223         char *q;
224         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
225         uint32 conv;
226   
227         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
228                 DEBUG(3,("string_to_sid: Sid %s does not start with 'S-'.\n", sidstr));
229                 return False;
230         }
231
232         ZERO_STRUCTP(sidout);
233
234         /* Get the revision number. */
235         p = sidstr + 2;
236         conv = (uint32) strtoul(p, &q, 10);
237         if (!q || (*q != '-')) {
238                 DEBUG(3,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
239                 return False;
240         }
241         sidout->sid_rev_num = (uint8) conv;
242         q++;
243
244         /* get identauth */
245         conv = (uint32) strtoul(q, &q, 10);
246         if (!q || (*q != '-')) {
247                 DEBUG(0,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
248                 return False;
249         }
250         /* identauth in decimal should be <  2^32 */
251         /* NOTE - the conv value is in big-endian format. */
252         sidout->id_auth[0] = 0;
253         sidout->id_auth[1] = 0;
254         sidout->id_auth[2] = (conv & 0xff000000) >> 24;
255         sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
256         sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
257         sidout->id_auth[5] = (conv & 0x000000ff);
258
259         q++;
260         sidout->num_auths = 0;
261
262         for(conv = (uint32) strtoul(q, &q, 10);
263             q && (*q =='-' || *q =='\0') && (sidout->num_auths < MAXSUBAUTHS);
264             conv = (uint32) strtoul(q, &q, 10)) {
265                 sid_append_rid(sidout, conv);
266                 if (*q == '\0')
267                         break;
268                 q++;
269         }
270                 
271         return True;
272 }
273
274 DOM_SID *string_sid_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
275 {
276         DOM_SID *result = TALLOC_P(mem_ctx, DOM_SID);
277
278         if (result == NULL)
279                 return NULL;
280
281         if (!string_to_sid(result, sidstr))
282                 return NULL;
283
284         return result;
285 }
286
287 /*****************************************************************
288  Add a rid to the end of a sid
289 *****************************************************************/  
290
291 bool sid_append_rid(DOM_SID *sid, uint32 rid)
292 {
293         if (sid->num_auths < MAXSUBAUTHS) {
294                 sid->sub_auths[sid->num_auths++] = rid;
295                 return True;
296         }
297         return False;
298 }
299
300 bool sid_compose(DOM_SID *dst, const DOM_SID *domain_sid, uint32 rid)
301 {
302         sid_copy(dst, domain_sid);
303         return sid_append_rid(dst, rid);
304 }
305
306 /*****************************************************************
307  Removes the last rid from the end of a sid
308 *****************************************************************/  
309
310 bool sid_split_rid(DOM_SID *sid, uint32 *rid)
311 {
312         if (sid->num_auths > 0) {
313                 sid->num_auths--;
314                 *rid = sid->sub_auths[sid->num_auths];
315                 return True;
316         }
317         return False;
318 }
319
320 /*****************************************************************
321  Return the last rid from the end of a sid
322 *****************************************************************/  
323
324 bool sid_peek_rid(const DOM_SID *sid, uint32 *rid)
325 {
326         if (!sid || !rid)
327                 return False;           
328         
329         if (sid->num_auths > 0) {
330                 *rid = sid->sub_auths[sid->num_auths - 1];
331                 return True;
332         }
333         return False;
334 }
335
336 /*****************************************************************
337  Return the last rid from the end of a sid
338  and check the sid against the exp_dom_sid  
339 *****************************************************************/  
340
341 bool sid_peek_check_rid(const DOM_SID *exp_dom_sid, const DOM_SID *sid, uint32 *rid)
342 {
343         if (!exp_dom_sid || !sid || !rid)
344                 return False;
345                         
346         if (sid->num_auths != (exp_dom_sid->num_auths+1)) {
347                 return False;
348         }
349
350         if (sid_compare_domain(exp_dom_sid, sid)!=0){
351                 *rid=(-1);
352                 return False;
353         }
354         
355         return sid_peek_rid(sid, rid);
356 }
357
358 /*****************************************************************
359  Copies a sid
360 *****************************************************************/  
361
362 void sid_copy(DOM_SID *dst, const DOM_SID *src)
363 {
364         int i;
365
366         ZERO_STRUCTP(dst);
367
368         dst->sid_rev_num = src->sid_rev_num;
369         dst->num_auths = src->num_auths;
370
371         memcpy(&dst->id_auth[0], &src->id_auth[0], sizeof(src->id_auth));
372
373         for (i = 0; i < src->num_auths; i++)
374                 dst->sub_auths[i] = src->sub_auths[i];
375 }
376
377 /*****************************************************************
378  Write a sid out into on-the-wire format.
379 *****************************************************************/  
380
381 bool sid_linearize(char *outbuf, size_t len, const DOM_SID *sid)
382 {
383         size_t i;
384
385         if (len < ndr_size_dom_sid(sid, 0))
386                 return False;
387
388         SCVAL(outbuf,0,sid->sid_rev_num);
389         SCVAL(outbuf,1,sid->num_auths);
390         memcpy(&outbuf[2], sid->id_auth, 6);
391         for(i = 0; i < sid->num_auths; i++)
392                 SIVAL(outbuf, 8 + (i*4), sid->sub_auths[i]);
393
394         return True;
395 }
396
397 /*****************************************************************
398  Parse a on-the-wire SID to a DOM_SID.
399 *****************************************************************/  
400
401 bool sid_parse(const char *inbuf, size_t len, DOM_SID *sid)
402 {
403         int i;
404         if (len < 8)
405                 return False;
406
407         ZERO_STRUCTP(sid);
408
409         sid->sid_rev_num = CVAL(inbuf, 0);
410         sid->num_auths = CVAL(inbuf, 1);
411         memcpy(sid->id_auth, inbuf+2, 6);
412         if (len < 8 + sid->num_auths*4)
413                 return False;
414         for (i=0;i<sid->num_auths;i++)
415                 sid->sub_auths[i] = IVAL(inbuf, 8+i*4);
416         return True;
417 }
418
419 /*****************************************************************
420  Compare the auth portion of two sids.
421 *****************************************************************/  
422
423 static int sid_compare_auth(const DOM_SID *sid1, const DOM_SID *sid2)
424 {
425         int i;
426
427         if (sid1 == sid2)
428                 return 0;
429         if (!sid1)
430                 return -1;
431         if (!sid2)
432                 return 1;
433
434         if (sid1->sid_rev_num != sid2->sid_rev_num)
435                 return sid1->sid_rev_num - sid2->sid_rev_num;
436
437         for (i = 0; i < 6; i++)
438                 if (sid1->id_auth[i] != sid2->id_auth[i])
439                         return sid1->id_auth[i] - sid2->id_auth[i];
440
441         return 0;
442 }
443
444 /*****************************************************************
445  Compare two sids.
446 *****************************************************************/  
447
448 int sid_compare(const DOM_SID *sid1, const DOM_SID *sid2)
449 {
450         int i;
451
452         if (sid1 == sid2)
453                 return 0;
454         if (!sid1)
455                 return -1;
456         if (!sid2)
457                 return 1;
458
459         /* Compare most likely different rids, first: i.e start at end */
460         if (sid1->num_auths != sid2->num_auths)
461                 return sid1->num_auths - sid2->num_auths;
462
463         for (i = sid1->num_auths-1; i >= 0; --i)
464                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
465                         return sid1->sub_auths[i] - sid2->sub_auths[i];
466
467         return sid_compare_auth(sid1, sid2);
468 }
469
470 /*****************************************************************
471  See if 2 SIDs are in the same domain
472  this just compares the leading sub-auths
473 *****************************************************************/  
474
475 int sid_compare_domain(const DOM_SID *sid1, const DOM_SID *sid2)
476 {
477         int n, i;
478
479         n = MIN(sid1->num_auths, sid2->num_auths);
480
481         for (i = n-1; i >= 0; --i)
482                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
483                         return sid1->sub_auths[i] - sid2->sub_auths[i];
484
485         return sid_compare_auth(sid1, sid2);
486 }
487
488 /*****************************************************************
489  Compare two sids.
490 *****************************************************************/  
491
492 bool sid_equal(const DOM_SID *sid1, const DOM_SID *sid2)
493 {
494         return sid_compare(sid1, sid2) == 0;
495 }
496
497 /*****************************************************************
498  Returns true if SID is internal (and non-mappable).
499 *****************************************************************/
500
501 bool non_mappable_sid(DOM_SID *sid)
502 {
503         DOM_SID dom;
504         uint32 rid;
505
506         sid_copy(&dom, sid);
507         sid_split_rid(&dom, &rid);
508
509         if (sid_equal(&dom, &global_sid_Builtin))
510                 return True;
511
512         if (sid_equal(&dom, &global_sid_NT_Authority))
513                 return True;
514
515         return False;
516 }
517
518 /*****************************************************************
519  Return the binary string representation of a DOM_SID.
520  Caller must free.
521 *****************************************************************/
522
523 char *sid_binstring(const DOM_SID *sid)
524 {
525         char *buf, *s;
526         int len = ndr_size_dom_sid(sid, 0);
527         buf = (char *)SMB_MALLOC(len);
528         if (!buf)
529                 return NULL;
530         sid_linearize(buf, len, sid);
531         s = binary_string_rfc2254(buf, len);
532         free(buf);
533         return s;
534 }
535
536 /*****************************************************************
537  Return the binary string representation of a DOM_SID.
538  Caller must free.
539 *****************************************************************/
540
541 char *sid_binstring_hex(const DOM_SID *sid)
542 {
543         char *buf, *s;
544         int len = ndr_size_dom_sid(sid, 0);
545         buf = (char *)SMB_MALLOC(len);
546         if (!buf)
547                 return NULL;
548         sid_linearize(buf, len, sid);
549         s = binary_string(buf, len);
550         free(buf);
551         return s;
552 }
553
554 /*******************************************************************
555  Tallocs a duplicate SID. 
556 ********************************************************************/ 
557
558 DOM_SID *sid_dup_talloc(TALLOC_CTX *ctx, const DOM_SID *src)
559 {
560         DOM_SID *dst;
561         
562         if(!src)
563                 return NULL;
564         
565         if((dst = TALLOC_ZERO_P(ctx, DOM_SID)) != NULL) {
566                 sid_copy( dst, src);
567         }
568         
569         return dst;
570 }
571
572 /********************************************************************
573  Add SID to an array SIDs
574 ********************************************************************/
575
576 NTSTATUS add_sid_to_array(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
577                           DOM_SID **sids, size_t *num)
578 {
579         *sids = TALLOC_REALLOC_ARRAY(mem_ctx, *sids, DOM_SID,
580                                              (*num)+1);
581         if (*sids == NULL) {
582                 *num = 0;
583                 return NT_STATUS_NO_MEMORY;
584         }
585
586         sid_copy(&((*sids)[*num]), sid);
587         *num += 1;
588
589         return NT_STATUS_OK;
590 }
591
592
593 /********************************************************************
594  Add SID to an array SIDs ensuring that it is not already there
595 ********************************************************************/
596
597 NTSTATUS add_sid_to_array_unique(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
598                                  DOM_SID **sids, size_t *num_sids)
599 {
600         size_t i;
601
602         for (i=0; i<(*num_sids); i++) {
603                 if (sid_compare(sid, &(*sids)[i]) == 0)
604                         return NT_STATUS_OK;
605         }
606
607         return add_sid_to_array(mem_ctx, sid, sids, num_sids);
608 }
609
610 /********************************************************************
611  Remove SID from an array
612 ********************************************************************/
613
614 void del_sid_from_array(const DOM_SID *sid, DOM_SID **sids, size_t *num)
615 {
616         DOM_SID *sid_list = *sids;
617         size_t i;
618
619         for ( i=0; i<*num; i++ ) {
620
621                 /* if we find the SID, then decrement the count
622                    and break out of the loop */
623
624                 if ( sid_equal(sid, &sid_list[i]) ) {
625                         *num -= 1;
626                         break;
627                 }
628         }
629
630         /* This loop will copy the remainder of the array 
631            if i < num of sids ni the array */
632
633         for ( ; i<*num; i++ ) 
634                 sid_copy( &sid_list[i], &sid_list[i+1] );
635         
636         return;
637 }
638
639 bool add_rid_to_array_unique(TALLOC_CTX *mem_ctx,
640                                     uint32 rid, uint32 **pp_rids, size_t *p_num)
641 {
642         size_t i;
643
644         for (i=0; i<*p_num; i++) {
645                 if ((*pp_rids)[i] == rid)
646                         return True;
647         }
648         
649         *pp_rids = TALLOC_REALLOC_ARRAY(mem_ctx, *pp_rids, uint32, *p_num+1);
650
651         if (*pp_rids == NULL) {
652                 *p_num = 0;
653                 return False;
654         }
655
656         (*pp_rids)[*p_num] = rid;
657         *p_num += 1;
658         return True;
659 }
660
661 bool is_null_sid(const DOM_SID *sid)
662 {
663         static const DOM_SID null_sid = {0};
664         return sid_equal(sid, &null_sid);
665 }
666
667 NTSTATUS sid_array_from_info3(TALLOC_CTX *mem_ctx,
668                               const struct netr_SamInfo3 *info3,
669                               DOM_SID **user_sids,
670                               size_t *num_user_sids,
671                               bool include_user_group_rid,
672                               bool skip_ressource_groups)
673 {
674         NTSTATUS status;
675         DOM_SID sid;
676         DOM_SID *sid_array = NULL;
677         size_t num_sids = 0;
678         int i;
679
680         if (include_user_group_rid) {
681
682                 if (!sid_compose(&sid, info3->base.domain_sid, info3->base.rid))
683                 {
684                         DEBUG(3, ("could not compose user SID from rid 0x%x\n",
685                                   info3->base.rid));
686                         return NT_STATUS_INVALID_PARAMETER;
687                 }
688                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
689                 if (!NT_STATUS_IS_OK(status)) {
690                         DEBUG(3, ("could not append user SID from rid 0x%x\n",
691                                   info3->base.rid));
692                         return status;
693                 }
694
695                 if (!sid_compose(&sid, info3->base.domain_sid, info3->base.primary_gid))
696                 {
697                         DEBUG(3, ("could not compose group SID from rid 0x%x\n",
698                                   info3->base.primary_gid));
699                         return NT_STATUS_INVALID_PARAMETER;
700                 }
701                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
702                 if (!NT_STATUS_IS_OK(status)) {
703                         DEBUG(3, ("could not append group SID from rid 0x%x\n",
704                                   info3->base.rid));
705                         return status;
706                 }
707         }
708
709         for (i = 0; i < info3->base.groups.count; i++) {
710                 if (!sid_compose(&sid, info3->base.domain_sid,
711                                  info3->base.groups.rids[i].rid))
712                 {
713                         DEBUG(3, ("could not compose SID from additional group "
714                                   "rid 0x%x\n", info3->base.groups.rids[i].rid));
715                         return NT_STATUS_INVALID_PARAMETER;
716                 }
717                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
718                 if (!NT_STATUS_IS_OK(status)) {
719                         DEBUG(3, ("could not append SID from additional group "
720                                   "rid 0x%x\n", info3->base.groups.rids[i].rid));
721                         return status;
722                 }
723         }
724
725         /* Copy 'other' sids.  We need to do sid filtering here to
726            prevent possible elevation of privileges.  See:
727
728            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
729          */
730
731         for (i = 0; i < info3->sidcount; i++) {
732
733                 if (skip_ressource_groups &&
734                     (info3->sids[i].attributes & SE_GROUP_RESOURCE)) {
735                         continue;
736                 }
737
738                 status = add_sid_to_array(mem_ctx, info3->sids[i].sid,
739                                       &sid_array, &num_sids);
740                 if (!NT_STATUS_IS_OK(status)) {
741                         DEBUG(3, ("could not add SID to array: %s\n",
742                                   sid_string_dbg(info3->sids[i].sid)));
743                         return status;
744                 }
745         }
746
747         *user_sids = sid_array;
748         *num_user_sids = num_sids;
749
750         return NT_STATUS_OK;
751 }