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, NULL, 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(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
 524 {
 525         uint8_t *buf;
 526         char *s;
 527         int len = ndr_size_dom_sid(sid, NULL, 0);
 528         buf = talloc_array(mem_ctx, uint8_t, len);
 529         if (!buf) {
 530                 return NULL;
 531         }
 532         sid_linearize((char *)buf, len, sid);
 533         s = binary_string_rfc2254(mem_ctx, buf, len);
 534         TALLOC_FREE(buf);
 535         return s;
 536 }
 537
 538 /*****************************************************************
 539  Return the binary string representation of a DOM_SID.
 540  Caller must free.
 541 *****************************************************************/
 542
 543 char *sid_binstring_hex(const DOM_SID *sid)
 544 {
 545         char *buf, *s;
 546         int len = ndr_size_dom_sid(sid, NULL, 0);
 547         buf = (char *)SMB_MALLOC(len);
 548         if (!buf)
 549                 return NULL;
 550         sid_linearize(buf, len, sid);
 551         s = binary_string(buf, len);
 552         free(buf);
 553         return s;
 554 }
 555
 556 /*******************************************************************
 557  Tallocs a duplicate SID.
 558 ********************************************************************/
 559
 560 DOM_SID *sid_dup_talloc(TALLOC_CTX *ctx, const DOM_SID *src)
 561 {
 562         DOM_SID *dst;
 563
 564         if(!src)
 565                 return NULL;
 566
 567         if((dst = TALLOC_ZERO_P(ctx, DOM_SID)) != NULL) {
 568                 sid_copy( dst, src);
 569         }
 570
 571         return dst;
 572 }
 573
 574 /********************************************************************
 575  Add SID to an array SIDs
 576 ********************************************************************/
 577
 578 NTSTATUS add_sid_to_array(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 579                           DOM_SID **sids, size_t *num)
 580 {
 581         *sids = TALLOC_REALLOC_ARRAY(mem_ctx, *sids, DOM_SID,
 582                                              (*num)+1);
 583         if (*sids == NULL) {
 584                 *num = 0;
 585                 return NT_STATUS_NO_MEMORY;
 586         }
 587
 588         sid_copy(&((*sids)[*num]), sid);
 589         *num += 1;
 590
 591         return NT_STATUS_OK;
 592 }
 593
 594
 595 /********************************************************************
 596  Add SID to an array SIDs ensuring that it is not already there
 597 ********************************************************************/
 598
 599 NTSTATUS add_sid_to_array_unique(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 600                                  DOM_SID **sids, size_t *num_sids)
 601 {
 602         size_t i;
 603
 604         for (i=0; i<(*num_sids); i++) {
 605                 if (sid_compare(sid, &(*sids)[i]) == 0)
 606                         return NT_STATUS_OK;
 607         }
 608
 609         return add_sid_to_array(mem_ctx, sid, sids, num_sids);
 610 }
 611
 612 /********************************************************************
 613  Remove SID from an array
 614 ********************************************************************/
 615
 616 void del_sid_from_array(const DOM_SID *sid, DOM_SID **sids, size_t *num)
 617 {
 618         DOM_SID *sid_list = *sids;
 619         size_t i;
 620
 621         for ( i=0; i<*num; i++ ) {
 622
 623                 /* if we find the SID, then decrement the count
 624                    and break out of the loop */
 625
 626                 if ( sid_equal(sid, &sid_list[i]) ) {
 627                         *num -= 1;
 628                         break;
 629                 }
 630         }
 631
 632         /* This loop will copy the remainder of the array
 633            if i < num of sids ni the array */
 634
 635         for ( ; i<*num; i++ )
 636                 sid_copy( &sid_list[i], &sid_list[i+1] );
 637
 638         return;
 639 }
 640
 641 bool add_rid_to_array_unique(TALLOC_CTX *mem_ctx,
 642                                     uint32 rid, uint32 **pp_rids, size_t *p_num)
 643 {
 644         size_t i;
 645
 646         for (i=0; i<*p_num; i++) {
 647                 if ((*pp_rids)[i] == rid)
 648                         return True;
 649         }
 650
 651         *pp_rids = TALLOC_REALLOC_ARRAY(mem_ctx, *pp_rids, uint32, *p_num+1);
 652
 653         if (*pp_rids == NULL) {
 654                 *p_num = 0;
 655                 return False;
 656         }
 657
 658         (*pp_rids)[*p_num] = rid;
 659         *p_num += 1;
 660         return True;
 661 }
 662
 663 bool is_null_sid(const DOM_SID *sid)
 664 {
 665         static const DOM_SID null_sid = {0};
 666         return sid_equal(sid, &null_sid);
 667 }
 668
 669 bool is_sid_in_token(const NT_USER_TOKEN *token, const DOM_SID *sid)
 670 {
 671         int i;
 672
 673         for (i=0; i<token->num_sids; i++) {
 674                 if (sid_compare(sid, &token->user_sids[i]) == 0)
 675                         return true;
 676         }
 677         return false;
 678 }
 679
 680 NTSTATUS sid_array_from_info3(TALLOC_CTX *mem_ctx,
 681                               const struct netr_SamInfo3 *info3,
 682                               DOM_SID **user_sids,
 683                               size_t *num_user_sids,
 684                               bool include_user_group_rid,
 685                               bool skip_ressource_groups)
 686 {
 687         NTSTATUS status;
 688         DOM_SID sid;
 689         DOM_SID *sid_array = NULL;
 690         size_t num_sids = 0;
 691         int i;
 692
 693         if (include_user_group_rid) {
 694                 if (!sid_compose(&sid, info3->base.domain_sid, info3->base.rid)) {
 695                         DEBUG(3, ("could not compose user SID from rid 0x%x\n",
 696                                   info3->base.rid));
 697                         return NT_STATUS_INVALID_PARAMETER;
 698                 }
 699                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
 700                 if (!NT_STATUS_IS_OK(status)) {
 701                         DEBUG(3, ("could not append user SID from rid 0x%x\n",
 702                                   info3->base.rid));
 703                         return status;
 704                 }
 705         }
 706
 707         if (!sid_compose(&sid, info3->base.domain_sid, info3->base.primary_gid)) {
 708                 DEBUG(3, ("could not compose group SID from rid 0x%x\n",
 709                           info3->base.primary_gid));
 710                 return NT_STATUS_INVALID_PARAMETER;
 711         }
 712         status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
 713         if (!NT_STATUS_IS_OK(status)) {
 714                 DEBUG(3, ("could not append group SID from rid 0x%x\n",
 715                           info3->base.rid));
 716                 return status;
 717         }
 718
 719         for (i = 0; i < info3->base.groups.count; i++) {
 720                 /* Don't add the primary group sid twice. */
 721                 if (info3->base.primary_gid == info3->base.groups.rids[i].rid) {
 722                         continue;
 723                 }
 724                 if (!sid_compose(&sid, info3->base.domain_sid,
 725                                  info3->base.groups.rids[i].rid)) {
 726                         DEBUG(3, ("could not compose SID from additional group "
 727                                   "rid 0x%x\n", info3->base.groups.rids[i].rid));
 728                         return NT_STATUS_INVALID_PARAMETER;
 729                 }
 730                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
 731                 if (!NT_STATUS_IS_OK(status)) {
 732                         DEBUG(3, ("could not append SID from additional group "
 733                                   "rid 0x%x\n", info3->base.groups.rids[i].rid));
 734                         return status;
 735                 }
 736         }
 737
 738         /* Copy 'other' sids.  We need to do sid filtering here to
 739            prevent possible elevation of privileges.  See:
 740
 741            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 742          */
 743
 744         for (i = 0; i < info3->sidcount; i++) {
 745
 746                 if (skip_ressource_groups &&
 747                     (info3->sids[i].attributes & SE_GROUP_RESOURCE)) {
 748                         continue;
 749                 }
 750
 751                 status = add_sid_to_array(mem_ctx, info3->sids[i].sid,
 752                                       &sid_array, &num_sids);
 753                 if (!NT_STATUS_IS_OK(status)) {
 754                         DEBUG(3, ("could not add SID to array: %s\n",
 755                                   sid_string_dbg(info3->sids[i].sid)));
 756                         return status;
 757                 }
 758         }
 759
 760         *user_sids = sid_array;
 761         *num_user_sids = num_sids;
 762
 763         return NT_STATUS_OK;
 764 }