release/src/router/samba3/source/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 2 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, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27
  28 /*
  29  * Some useful sids
  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 const DOM_SID global_sid_Network =                      /* Network rids */
  48 { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  49
  50 const DOM_SID global_sid_Creator_Owner =                /* Creator Owner */
  51 { 1, 1, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  52 const DOM_SID global_sid_Creator_Group =                /* Creator Group */
  53 { 1, 1, {0,0,0,0,0,3}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  54 const DOM_SID global_sid_Anonymous =                    /* Anonymous login */
  55 { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  56
  57 const DOM_SID global_sid_Builtin =                      /* Local well-known domain */
  58 { 1, 1, {0,0,0,0,0,5}, {32,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  59 const DOM_SID global_sid_Builtin_Administrators =       /* Builtin administrators */
  60 { 1, 2, {0,0,0,0,0,5}, {32,544,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  61 const DOM_SID global_sid_Builtin_Users =                /* Builtin users */
  62 { 1, 2, {0,0,0,0,0,5}, {32,545,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  63 const DOM_SID global_sid_Builtin_Guests =               /* Builtin guest users */
  64 { 1, 2, {0,0,0,0,0,5}, {32,546,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  65 const DOM_SID global_sid_Builtin_Power_Users =  /* Builtin power users */
  66 { 1, 2, {0,0,0,0,0,5}, {32,547,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  67 const DOM_SID global_sid_Builtin_Account_Operators =    /* Builtin account operators */
  68 { 1, 2, {0,0,0,0,0,5}, {32,548,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  69 const DOM_SID global_sid_Builtin_Server_Operators =     /* Builtin server operators */
  70 { 1, 2, {0,0,0,0,0,5}, {32,549,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  71 const DOM_SID global_sid_Builtin_Print_Operators =      /* Builtin print operators */
  72 { 1, 2, {0,0,0,0,0,5}, {32,550,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  73 const DOM_SID global_sid_Builtin_Backup_Operators =     /* Builtin backup operators */
  74 { 1, 2, {0,0,0,0,0,5}, {32,551,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  75 const DOM_SID global_sid_Builtin_Replicator =           /* Builtin replicator */
  76 { 1, 2, {0,0,0,0,0,5}, {32,552,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  77 const DOM_SID global_sid_Builtin_PreWin2kAccess =       /* Builtin pre win2k access */
  78 { 1, 2, {0,0,0,0,0,5}, {32,554,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  79
  80 const DOM_SID global_sid_Unix_Users =                   /* Unmapped Unix users */
  81 { 1, 1, {0,0,0,0,0,22}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  82 const DOM_SID global_sid_Unix_Groups =                  /* Unmapped Unix groups */
  83 { 1, 1, {0,0,0,0,0,22}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  84
  85 /* Unused, left here for documentary purposes */
  86 #if 0
  87 #define SECURITY_NULL_SID_AUTHORITY    0
  88 #define SECURITY_WORLD_SID_AUTHORITY   1
  89 #define SECURITY_LOCAL_SID_AUTHORITY   2
  90 #define SECURITY_CREATOR_SID_AUTHORITY 3
  91 #define SECURITY_NT_AUTHORITY          5
  92 #endif
  93
  94 /*
  95  * An NT compatible anonymous token.
  96  */
  97
  98 static DOM_SID anon_sid_array[3] =
  99 { { 1, 1, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
 100   { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
 101   { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
 102 NT_USER_TOKEN anonymous_token = { 3, anon_sid_array, SE_NONE };
 103
 104 static DOM_SID system_sid_array[1] =
 105 { { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
 106 NT_USER_TOKEN system_token = { 1, system_sid_array, SE_ALL_PRIVS };
 107
 108 /****************************************************************************
 109  Lookup string names for SID types.
 110 ****************************************************************************/
 111
 112 static const struct {
 113         enum lsa_SidType sid_type;
 114         const char *string;
 115 } sid_name_type[] = {
 116         {SID_NAME_USER, "User"},
 117         {SID_NAME_DOM_GRP, "Domain Group"},
 118         {SID_NAME_DOMAIN, "Domain"},
 119         {SID_NAME_ALIAS, "Local Group"},
 120         {SID_NAME_WKN_GRP, "Well-known Group"},
 121         {SID_NAME_DELETED, "Deleted Account"},
 122         {SID_NAME_INVALID, "Invalid Account"},
 123         {SID_NAME_UNKNOWN, "UNKNOWN"},
 124         {SID_NAME_COMPUTER, "Computer"},
 125
 126         {(enum lsa_SidType)0, NULL}
 127 };
 128
 129 const char *sid_type_lookup(uint32 sid_type)
 130 {
 131         int i = 0;
 132
 133         /* Look through list */
 134         while(sid_name_type[i].sid_type != 0) {
 135                 if (sid_name_type[i].sid_type == sid_type)
 136                         return sid_name_type[i].string;
 137                 i++;
 138         }
 139
 140         /* Default return */
 141         return "SID *TYPE* is INVALID";
 142 }
 143
 144 /**************************************************************************
 145  Create the SYSTEM token.
 146 ***************************************************************************/
 147
 148 NT_USER_TOKEN *get_system_token(void)
 149 {
 150         return &system_token;
 151 }
 152
 153 /******************************************************************
 154  get the default domain/netbios name to be used when dealing
 155  with our passdb list of accounts
 156 ******************************************************************/
 157
 158 const char *get_global_sam_name(void)
 159 {
 160         if ((lp_server_role() == ROLE_DOMAIN_PDC) || (lp_server_role() == ROLE_DOMAIN_BDC)) {
 161                 return lp_workgroup();
 162         }
 163         return global_myname();
 164 }
 165
 166 /*****************************************************************
 167  Convert a SID to an ascii string.
 168 *****************************************************************/
 169
 170 char *sid_to_string(fstring sidstr_out, const DOM_SID *sid)
 171 {
 172         char subauth[16];
 173         int i;
 174         uint32 ia;
 175
 176         if (!sid) {
 177                 fstrcpy(sidstr_out, "(NULL SID)");
 178                 return sidstr_out;
 179         }
 180
 181         /*
 182          * BIG NOTE: this function only does SIDS where the identauth is not >= 2^32
 183          * in a range of 2^48.
 184          */
 185         ia = (sid->id_auth[5]) +
 186                 (sid->id_auth[4] << 8 ) +
 187                 (sid->id_auth[3] << 16) +
 188                 (sid->id_auth[2] << 24);
 189
 190         slprintf(sidstr_out, sizeof(fstring) - 1, "S-%u-%lu", (unsigned int)sid->sid_rev_num, (unsigned long)ia);
 191
 192         for (i = 0; i < sid->num_auths; i++) {
 193                 slprintf(subauth, sizeof(subauth)-1, "-%lu", (unsigned long)sid->sub_auths[i]);
 194                 fstrcat(sidstr_out, subauth);
 195         }
 196
 197         return sidstr_out;
 198 }
 199
 200 /*****************************************************************
 201  Useful function for debug lines.
 202 *****************************************************************/
 203
 204 const char *sid_string_static(const DOM_SID *sid)
 205 {
 206         static fstring sid_str;
 207         sid_to_string(sid_str, sid);
 208         return sid_str;
 209 }
 210
 211 /*****************************************************************
 212  Convert a string to a SID. Returns True on success, False on fail.
 213 *****************************************************************/
 214
 215 BOOL string_to_sid(DOM_SID *sidout, const char *sidstr)
 216 {
 217         const char *p;
 218         char *q;
 219         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
 220         uint32 conv;
 221
 222         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
 223                 DEBUG(3,("string_to_sid: Sid %s does not start with 'S-'.\n", sidstr));
 224                 return False;
 225         }
 226
 227         ZERO_STRUCTP(sidout);
 228
 229         /* Get the revision number. */
 230         p = sidstr + 2;
 231         conv = (uint32) strtoul(p, &q, 10);
 232         if (!q || (*q != '-')) {
 233                 DEBUG(3,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
 234                 return False;
 235         }
 236         sidout->sid_rev_num = (uint8) conv;
 237         q++;
 238
 239         /* get identauth */
 240         conv = (uint32) strtoul(q, &q, 10);
 241         if (!q || (*q != '-')) {
 242                 DEBUG(0,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
 243                 return False;
 244         }
 245         /* identauth in decimal should be <  2^32 */
 246         /* NOTE - the conv value is in big-endian format. */
 247         sidout->id_auth[0] = 0;
 248         sidout->id_auth[1] = 0;
 249         sidout->id_auth[2] = (conv & 0xff000000) >> 24;
 250         sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
 251         sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
 252         sidout->id_auth[5] = (conv & 0x000000ff);
 253
 254         q++;
 255         sidout->num_auths = 0;
 256
 257         for(conv = (uint32) strtoul(q, &q, 10);
 258             q && (*q =='-' || *q =='\0') && (sidout->num_auths < MAXSUBAUTHS);
 259             conv = (uint32) strtoul(q, &q, 10)) {
 260                 sid_append_rid(sidout, conv);
 261                 if (*q == '\0')
 262                         break;
 263                 q++;
 264         }
 265
 266         return True;
 267 }
 268
 269 DOM_SID *string_sid_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
 270 {
 271         DOM_SID *result = TALLOC_P(mem_ctx, DOM_SID);
 272
 273         if (result == NULL)
 274                 return NULL;
 275
 276         if (!string_to_sid(result, sidstr))
 277                 return NULL;
 278
 279         return result;
 280 }
 281
 282 /*****************************************************************
 283  Add a rid to the end of a sid
 284 *****************************************************************/
 285
 286 BOOL sid_append_rid(DOM_SID *sid, uint32 rid)
 287 {
 288         if (sid->num_auths < MAXSUBAUTHS) {
 289                 sid->sub_auths[sid->num_auths++] = rid;
 290                 return True;
 291         }
 292         return False;
 293 }
 294
 295 BOOL sid_compose(DOM_SID *dst, const DOM_SID *domain_sid, uint32 rid)
 296 {
 297         sid_copy(dst, domain_sid);
 298         return sid_append_rid(dst, rid);
 299 }
 300
 301 /*****************************************************************
 302  Removes the last rid from the end of a sid
 303 *****************************************************************/
 304
 305 BOOL sid_split_rid(DOM_SID *sid, uint32 *rid)
 306 {
 307         if (sid->num_auths > 0) {
 308                 sid->num_auths--;
 309                 *rid = sid->sub_auths[sid->num_auths];
 310                 return True;
 311         }
 312         return False;
 313 }
 314
 315 /*****************************************************************
 316  Return the last rid from the end of a sid
 317 *****************************************************************/
 318
 319 BOOL sid_peek_rid(const DOM_SID *sid, uint32 *rid)
 320 {
 321         if (!sid || !rid)
 322                 return False;
 323
 324         if (sid->num_auths > 0) {
 325                 *rid = sid->sub_auths[sid->num_auths - 1];
 326                 return True;
 327         }
 328         return False;
 329 }
 330
 331 /*****************************************************************
 332  Return the last rid from the end of a sid
 333  and check the sid against the exp_dom_sid
 334 *****************************************************************/
 335
 336 BOOL sid_peek_check_rid(const DOM_SID *exp_dom_sid, const DOM_SID *sid, uint32 *rid)
 337 {
 338         if (!exp_dom_sid || !sid || !rid)
 339                 return False;
 340
 341         if (sid->num_auths != (exp_dom_sid->num_auths+1)) {
 342                 return False;
 343         }
 344
 345         if (sid_compare_domain(exp_dom_sid, sid)!=0){
 346                 *rid=(-1);
 347                 return False;
 348         }
 349
 350         return sid_peek_rid(sid, rid);
 351 }
 352
 353 /*****************************************************************
 354  Copies a sid
 355 *****************************************************************/
 356
 357 void sid_copy(DOM_SID *dst, const DOM_SID *src)
 358 {
 359         int i;
 360
 361         ZERO_STRUCTP(dst);
 362
 363         dst->sid_rev_num = src->sid_rev_num;
 364         dst->num_auths = src->num_auths;
 365
 366         memcpy(&dst->id_auth[0], &src->id_auth[0], sizeof(src->id_auth));
 367
 368         for (i = 0; i < src->num_auths; i++)
 369                 dst->sub_auths[i] = src->sub_auths[i];
 370 }
 371
 372 /*****************************************************************
 373  Write a sid out into on-the-wire format.
 374 *****************************************************************/
 375
 376 BOOL sid_linearize(char *outbuf, size_t len, const DOM_SID *sid)
 377 {
 378         size_t i;
 379
 380         if (len < sid_size(sid))
 381                 return False;
 382
 383         SCVAL(outbuf,0,sid->sid_rev_num);
 384         SCVAL(outbuf,1,sid->num_auths);
 385         memcpy(&outbuf[2], sid->id_auth, 6);
 386         for(i = 0; i < sid->num_auths; i++)
 387                 SIVAL(outbuf, 8 + (i*4), sid->sub_auths[i]);
 388
 389         return True;
 390 }
 391
 392 /*****************************************************************
 393  Parse a on-the-wire SID to a DOM_SID.
 394 *****************************************************************/
 395
 396 BOOL sid_parse(const char *inbuf, size_t len, DOM_SID *sid)
 397 {
 398         int i;
 399         if (len < 8)
 400                 return False;
 401
 402         ZERO_STRUCTP(sid);
 403
 404         sid->sid_rev_num = CVAL(inbuf, 0);
 405         sid->num_auths = CVAL(inbuf, 1);
 406         if (sid->num_auths > MAXSUBAUTHS) {
 407                 return False;
 408         }
 409         memcpy(sid->id_auth, inbuf+2, 6);
 410         if (len < 8 + sid->num_auths*4)
 411                 return False;
 412         for (i=0;i<sid->num_auths;i++)
 413                 sid->sub_auths[i] = IVAL(inbuf, 8+i*4);
 414         return True;
 415 }
 416
 417 /*****************************************************************
 418  Compare the auth portion of two sids.
 419 *****************************************************************/
 420
 421 static int sid_compare_auth(const DOM_SID *sid1, const DOM_SID *sid2)
 422 {
 423         int i;
 424
 425         if (sid1 == sid2)
 426                 return 0;
 427         if (!sid1)
 428                 return -1;
 429         if (!sid2)
 430                 return 1;
 431
 432         if (sid1->sid_rev_num != sid2->sid_rev_num)
 433                 return sid1->sid_rev_num - sid2->sid_rev_num;
 434
 435         for (i = 0; i < 6; i++)
 436                 if (sid1->id_auth[i] != sid2->id_auth[i])
 437                         return sid1->id_auth[i] - sid2->id_auth[i];
 438
 439         return 0;
 440 }
 441
 442 /*****************************************************************
 443  Compare two sids.
 444 *****************************************************************/
 445
 446 int sid_compare(const DOM_SID *sid1, const DOM_SID *sid2)
 447 {
 448         int i;
 449
 450         if (sid1 == sid2)
 451                 return 0;
 452         if (!sid1)
 453                 return -1;
 454         if (!sid2)
 455                 return 1;
 456
 457         /* Compare most likely different rids, first: i.e start at end */
 458         if (sid1->num_auths != sid2->num_auths)
 459                 return sid1->num_auths - sid2->num_auths;
 460
 461         for (i = sid1->num_auths-1; i >= 0; --i)
 462                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
 463                         return sid1->sub_auths[i] - sid2->sub_auths[i];
 464
 465         return sid_compare_auth(sid1, sid2);
 466 }
 467
 468 /*****************************************************************
 469  See if 2 SIDs are in the same domain
 470  this just compares the leading sub-auths
 471 *****************************************************************/
 472
 473 int sid_compare_domain(const DOM_SID *sid1, const DOM_SID *sid2)
 474 {
 475         int n, i;
 476
 477         n = MIN(sid1->num_auths, sid2->num_auths);
 478
 479         for (i = n-1; i >= 0; --i)
 480                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
 481                         return sid1->sub_auths[i] - sid2->sub_auths[i];
 482
 483         return sid_compare_auth(sid1, sid2);
 484 }
 485
 486 /*****************************************************************
 487  Compare two sids.
 488 *****************************************************************/
 489
 490 BOOL sid_equal(const DOM_SID *sid1, const DOM_SID *sid2)
 491 {
 492         return sid_compare(sid1, sid2) == 0;
 493 }
 494
 495 /*****************************************************************
 496  Calculates size of a sid.
 497 *****************************************************************/
 498
 499 size_t sid_size(const DOM_SID *sid)
 500 {
 501         if (sid == NULL)
 502                 return 0;
 503
 504         return sid->num_auths * sizeof(uint32) + 8;
 505 }
 506
 507 /*****************************************************************
 508  Returns true if SID is internal (and non-mappable).
 509 *****************************************************************/
 510
 511 BOOL non_mappable_sid(DOM_SID *sid)
 512 {
 513         DOM_SID dom;
 514         uint32 rid;
 515
 516         sid_copy(&dom, sid);
 517         sid_split_rid(&dom, &rid);
 518
 519         if (sid_equal(&dom, &global_sid_Builtin))
 520                 return True;
 521
 522         if (sid_equal(&dom, &global_sid_NT_Authority))
 523                 return True;
 524
 525         return False;
 526 }
 527
 528 /*****************************************************************
 529  Return the binary string representation of a DOM_SID.
 530  Caller must free.
 531 *****************************************************************/
 532
 533 char *sid_binstring(const DOM_SID *sid)
 534 {
 535         char *buf, *s;
 536         int len = sid_size(sid);
 537         buf = (char *)SMB_MALLOC(len);
 538         if (!buf)
 539                 return NULL;
 540         sid_linearize(buf, len, sid);
 541         s = binary_string_rfc2254(buf, len);
 542         free(buf);
 543         return s;
 544 }
 545
 546 /*****************************************************************
 547  Return the binary string representation of a DOM_SID.
 548  Caller must free.
 549 *****************************************************************/
 550
 551 char *sid_binstring_hex(const DOM_SID *sid)
 552 {
 553         char *buf, *s;
 554         int len = sid_size(sid);
 555         buf = (char *)SMB_MALLOC(len);
 556         if (!buf)
 557                 return NULL;
 558         sid_linearize(buf, len, sid);
 559         s = binary_string(buf, len);
 560         free(buf);
 561         return s;
 562 }
 563
 564 /*******************************************************************
 565  Tallocs a duplicate SID.
 566 ********************************************************************/
 567
 568 DOM_SID *sid_dup_talloc(TALLOC_CTX *ctx, const DOM_SID *src)
 569 {
 570         DOM_SID *dst;
 571
 572         if(!src)
 573                 return NULL;
 574
 575         if((dst = TALLOC_ZERO_P(ctx, DOM_SID)) != NULL) {
 576                 sid_copy( dst, src);
 577         }
 578
 579         return dst;
 580 }
 581
 582 /********************************************************************
 583  Add SID to an array SIDs
 584 ********************************************************************/
 585
 586 BOOL add_sid_to_array(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 587                       DOM_SID **sids, size_t *num)
 588 {
 589         *sids = TALLOC_REALLOC_ARRAY(mem_ctx, *sids, DOM_SID,
 590                                              (*num)+1);
 591         if (*sids == NULL) {
 592                 *num = 0;
 593                 return False;
 594         }
 595
 596         sid_copy(&((*sids)[*num]), sid);
 597         *num += 1;
 598
 599         return True;
 600 }
 601
 602
 603 /********************************************************************
 604  Add SID to an array SIDs ensuring that it is not already there
 605 ********************************************************************/
 606
 607 BOOL add_sid_to_array_unique(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 608                              DOM_SID **sids, size_t *num_sids)
 609 {
 610         size_t i;
 611
 612         for (i=0; i<(*num_sids); i++) {
 613                 if (sid_compare(sid, &(*sids)[i]) == 0)
 614                         return True;
 615         }
 616
 617         return add_sid_to_array(mem_ctx, sid, sids, num_sids);
 618 }
 619
 620 /********************************************************************
 621  Remove SID from an array
 622 ********************************************************************/
 623
 624 void del_sid_from_array(const DOM_SID *sid, DOM_SID **sids, size_t *num)
 625 {
 626         DOM_SID *sid_list = *sids;
 627         size_t i;
 628
 629         for ( i=0; i<*num; i++ ) {
 630
 631                 /* if we find the SID, then decrement the count
 632                    and break out of the loop */
 633
 634                 if ( sid_equal(sid, &sid_list[i]) ) {
 635                         *num -= 1;
 636                         break;
 637                 }
 638         }
 639
 640         /* This loop will copy the remainder of the array
 641            if i < num of sids ni the array */
 642
 643         for ( ; i<*num; i++ )
 644                 sid_copy( &sid_list[i], &sid_list[i+1] );
 645
 646         return;
 647 }
 648
 649 BOOL add_rid_to_array_unique(TALLOC_CTX *mem_ctx,
 650                                     uint32 rid, uint32 **pp_rids, size_t *p_num)
 651 {
 652         size_t i;
 653
 654         for (i=0; i<*p_num; i++) {
 655                 if ((*pp_rids)[i] == rid)
 656                         return True;
 657         }
 658
 659         *pp_rids = TALLOC_REALLOC_ARRAY(mem_ctx, *pp_rids, uint32, *p_num+1);
 660
 661         if (*pp_rids == NULL) {
 662                 *p_num = 0;
 663                 return False;
 664         }
 665
 666         (*pp_rids)[*p_num] = rid;
 667         *p_num += 1;
 668         return True;
 669 }
 670
 671 BOOL is_null_sid(const DOM_SID *sid)
 672 {
 673         static const DOM_SID null_sid = {0};
 674         return sid_equal(sid, &null_sid);
 675 }