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 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_string(fstring sidstr_out, const DOM_SID *sid)
 176 {
 177         char subauth[16];
 178         int i;
 179         uint32 ia;
 180
 181         if (!sid) {
 182                 fstrcpy(sidstr_out, "(NULL SID)");
 183                 return sidstr_out;
 184         }
 185
 186         /*
 187          * BIG NOTE: this function only does SIDS where the identauth is not >= 2^32
 188          * in a range of 2^48.
 189          */
 190         ia = (sid->id_auth[5]) +
 191                 (sid->id_auth[4] << 8 ) +
 192                 (sid->id_auth[3] << 16) +
 193                 (sid->id_auth[2] << 24);
 194
 195         slprintf(sidstr_out, sizeof(fstring) - 1, "S-%u-%lu", (unsigned int)sid->sid_rev_num, (unsigned long)ia);
 196
 197         for (i = 0; i < sid->num_auths; i++) {
 198                 slprintf(subauth, sizeof(subauth)-1, "-%lu", (unsigned long)sid->sub_auths[i]);
 199                 fstrcat(sidstr_out, subauth);
 200         }
 201
 202         return sidstr_out;
 203 }
 204
 205 /*****************************************************************
 206  Useful function for debug lines.
 207 *****************************************************************/
 208
 209 const char *sid_string_static(const DOM_SID *sid)
 210 {
 211         static fstring sid_str;
 212         sid_to_string(sid_str, sid);
 213         return sid_str;
 214 }
 215
 216 char *sid_string_talloc(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
 217 {
 218         fstring sid_str;
 219         char *result;
 220         sid_to_string(sid_str, sid);
 221         result = talloc_strdup(mem_ctx, sid_str);
 222         SMB_ASSERT(result != NULL);
 223         return result;
 224 }
 225
 226 char *sid_string_dbg(const DOM_SID *sid)
 227 {
 228         return sid_string_talloc(debug_ctx(), sid);
 229 }
 230
 231 char *sid_string_tos(const DOM_SID *sid)
 232 {
 233         return sid_string_talloc(talloc_tos(), sid);
 234 }
 235
 236 /*****************************************************************
 237  Convert a string to a SID. Returns True on success, False on fail.
 238 *****************************************************************/
 239
 240 bool string_to_sid(DOM_SID *sidout, const char *sidstr)
 241 {
 242         const char *p;
 243         char *q;
 244         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
 245         uint32 conv;
 246
 247         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
 248                 DEBUG(3,("string_to_sid: Sid %s does not start with 'S-'.\n", sidstr));
 249                 return False;
 250         }
 251
 252         ZERO_STRUCTP(sidout);
 253
 254         /* Get the revision number. */
 255         p = sidstr + 2;
 256         conv = (uint32) strtoul(p, &q, 10);
 257         if (!q || (*q != '-')) {
 258                 DEBUG(3,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
 259                 return False;
 260         }
 261         sidout->sid_rev_num = (uint8) conv;
 262         q++;
 263
 264         /* get identauth */
 265         conv = (uint32) strtoul(q, &q, 10);
 266         if (!q || (*q != '-')) {
 267                 DEBUG(0,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
 268                 return False;
 269         }
 270         /* identauth in decimal should be <  2^32 */
 271         /* NOTE - the conv value is in big-endian format. */
 272         sidout->id_auth[0] = 0;
 273         sidout->id_auth[1] = 0;
 274         sidout->id_auth[2] = (conv & 0xff000000) >> 24;
 275         sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
 276         sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
 277         sidout->id_auth[5] = (conv & 0x000000ff);
 278
 279         q++;
 280         sidout->num_auths = 0;
 281
 282         for(conv = (uint32) strtoul(q, &q, 10);
 283             q && (*q =='-' || *q =='\0') && (sidout->num_auths < MAXSUBAUTHS);
 284             conv = (uint32) strtoul(q, &q, 10)) {
 285                 sid_append_rid(sidout, conv);
 286                 if (*q == '\0')
 287                         break;
 288                 q++;
 289         }
 290
 291         return True;
 292 }
 293
 294 DOM_SID *string_sid_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
 295 {
 296         DOM_SID *result = TALLOC_P(mem_ctx, DOM_SID);
 297
 298         if (result == NULL)
 299                 return NULL;
 300
 301         if (!string_to_sid(result, sidstr))
 302                 return NULL;
 303
 304         return result;
 305 }
 306
 307 /*****************************************************************
 308  Add a rid to the end of a sid
 309 *****************************************************************/
 310
 311 bool sid_append_rid(DOM_SID *sid, uint32 rid)
 312 {
 313         if (sid->num_auths < MAXSUBAUTHS) {
 314                 sid->sub_auths[sid->num_auths++] = rid;
 315                 return True;
 316         }
 317         return False;
 318 }
 319
 320 bool sid_compose(DOM_SID *dst, const DOM_SID *domain_sid, uint32 rid)
 321 {
 322         sid_copy(dst, domain_sid);
 323         return sid_append_rid(dst, rid);
 324 }
 325
 326 /*****************************************************************
 327  Removes the last rid from the end of a sid
 328 *****************************************************************/
 329
 330 bool sid_split_rid(DOM_SID *sid, uint32 *rid)
 331 {
 332         if (sid->num_auths > 0) {
 333                 sid->num_auths--;
 334                 *rid = sid->sub_auths[sid->num_auths];
 335                 return True;
 336         }
 337         return False;
 338 }
 339
 340 /*****************************************************************
 341  Return the last rid from the end of a sid
 342 *****************************************************************/
 343
 344 bool sid_peek_rid(const DOM_SID *sid, uint32 *rid)
 345 {
 346         if (!sid || !rid)
 347                 return False;
 348
 349         if (sid->num_auths > 0) {
 350                 *rid = sid->sub_auths[sid->num_auths - 1];
 351                 return True;
 352         }
 353         return False;
 354 }
 355
 356 /*****************************************************************
 357  Return the last rid from the end of a sid
 358  and check the sid against the exp_dom_sid
 359 *****************************************************************/
 360
 361 bool sid_peek_check_rid(const DOM_SID *exp_dom_sid, const DOM_SID *sid, uint32 *rid)
 362 {
 363         if (!exp_dom_sid || !sid || !rid)
 364                 return False;
 365
 366         if (sid->num_auths != (exp_dom_sid->num_auths+1)) {
 367                 return False;
 368         }
 369
 370         if (sid_compare_domain(exp_dom_sid, sid)!=0){
 371                 *rid=(-1);
 372                 return False;
 373         }
 374
 375         return sid_peek_rid(sid, rid);
 376 }
 377
 378 /*****************************************************************
 379  Copies a sid
 380 *****************************************************************/
 381
 382 void sid_copy(DOM_SID *dst, const DOM_SID *src)
 383 {
 384         int i;
 385
 386         ZERO_STRUCTP(dst);
 387
 388         dst->sid_rev_num = src->sid_rev_num;
 389         dst->num_auths = src->num_auths;
 390
 391         memcpy(&dst->id_auth[0], &src->id_auth[0], sizeof(src->id_auth));
 392
 393         for (i = 0; i < src->num_auths; i++)
 394                 dst->sub_auths[i] = src->sub_auths[i];
 395 }
 396
 397 /*****************************************************************
 398  Write a sid out into on-the-wire format.
 399 *****************************************************************/
 400
 401 bool sid_linearize(char *outbuf, size_t len, const DOM_SID *sid)
 402 {
 403         size_t i;
 404
 405         if (len < sid_size(sid))
 406                 return False;
 407
 408         SCVAL(outbuf,0,sid->sid_rev_num);
 409         SCVAL(outbuf,1,sid->num_auths);
 410         memcpy(&outbuf[2], sid->id_auth, 6);
 411         for(i = 0; i < sid->num_auths; i++)
 412                 SIVAL(outbuf, 8 + (i*4), sid->sub_auths[i]);
 413
 414         return True;
 415 }
 416
 417 /*****************************************************************
 418  Parse a on-the-wire SID to a DOM_SID.
 419 *****************************************************************/
 420
 421 bool sid_parse(const char *inbuf, size_t len, DOM_SID *sid)
 422 {
 423         int i;
 424         if (len < 8)
 425                 return False;
 426
 427         ZERO_STRUCTP(sid);
 428
 429         sid->sid_rev_num = CVAL(inbuf, 0);
 430         sid->num_auths = CVAL(inbuf, 1);
 431         memcpy(sid->id_auth, inbuf+2, 6);
 432         if (len < 8 + sid->num_auths*4)
 433                 return False;
 434         for (i=0;i<sid->num_auths;i++)
 435                 sid->sub_auths[i] = IVAL(inbuf, 8+i*4);
 436         return True;
 437 }
 438
 439 /*****************************************************************
 440  Compare the auth portion of two sids.
 441 *****************************************************************/
 442
 443 static int sid_compare_auth(const DOM_SID *sid1, const DOM_SID *sid2)
 444 {
 445         int i;
 446
 447         if (sid1 == sid2)
 448                 return 0;
 449         if (!sid1)
 450                 return -1;
 451         if (!sid2)
 452                 return 1;
 453
 454         if (sid1->sid_rev_num != sid2->sid_rev_num)
 455                 return sid1->sid_rev_num - sid2->sid_rev_num;
 456
 457         for (i = 0; i < 6; i++)
 458                 if (sid1->id_auth[i] != sid2->id_auth[i])
 459                         return sid1->id_auth[i] - sid2->id_auth[i];
 460
 461         return 0;
 462 }
 463
 464 /*****************************************************************
 465  Compare two sids.
 466 *****************************************************************/
 467
 468 int sid_compare(const DOM_SID *sid1, const DOM_SID *sid2)
 469 {
 470         int i;
 471
 472         if (sid1 == sid2)
 473                 return 0;
 474         if (!sid1)
 475                 return -1;
 476         if (!sid2)
 477                 return 1;
 478
 479         /* Compare most likely different rids, first: i.e start at end */
 480         if (sid1->num_auths != sid2->num_auths)
 481                 return sid1->num_auths - sid2->num_auths;
 482
 483         for (i = sid1->num_auths-1; i >= 0; --i)
 484                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
 485                         return sid1->sub_auths[i] - sid2->sub_auths[i];
 486
 487         return sid_compare_auth(sid1, sid2);
 488 }
 489
 490 /*****************************************************************
 491  See if 2 SIDs are in the same domain
 492  this just compares the leading sub-auths
 493 *****************************************************************/
 494
 495 int sid_compare_domain(const DOM_SID *sid1, const DOM_SID *sid2)
 496 {
 497         int n, i;
 498
 499         n = MIN(sid1->num_auths, sid2->num_auths);
 500
 501         for (i = n-1; i >= 0; --i)
 502                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
 503                         return sid1->sub_auths[i] - sid2->sub_auths[i];
 504
 505         return sid_compare_auth(sid1, sid2);
 506 }
 507
 508 /*****************************************************************
 509  Compare two sids.
 510 *****************************************************************/
 511
 512 bool sid_equal(const DOM_SID *sid1, const DOM_SID *sid2)
 513 {
 514         return sid_compare(sid1, sid2) == 0;
 515 }
 516
 517 /*****************************************************************
 518  Calculates size of a sid.
 519 *****************************************************************/
 520
 521 size_t sid_size(const DOM_SID *sid)
 522 {
 523         if (sid == NULL)
 524                 return 0;
 525
 526         return sid->num_auths * sizeof(uint32) + 8;
 527 }
 528
 529 /*****************************************************************
 530  Returns true if SID is internal (and non-mappable).
 531 *****************************************************************/
 532
 533 bool non_mappable_sid(DOM_SID *sid)
 534 {
 535         DOM_SID dom;
 536         uint32 rid;
 537
 538         sid_copy(&dom, sid);
 539         sid_split_rid(&dom, &rid);
 540
 541         if (sid_equal(&dom, &global_sid_Builtin))
 542                 return True;
 543
 544         if (sid_equal(&dom, &global_sid_NT_Authority))
 545                 return True;
 546
 547         return False;
 548 }
 549
 550 /*****************************************************************
 551  Return the binary string representation of a DOM_SID.
 552  Caller must free.
 553 *****************************************************************/
 554
 555 char *sid_binstring(const DOM_SID *sid)
 556 {
 557         char *buf, *s;
 558         int len = sid_size(sid);
 559         buf = (char *)SMB_MALLOC(len);
 560         if (!buf)
 561                 return NULL;
 562         sid_linearize(buf, len, sid);
 563         s = binary_string_rfc2254(buf, len);
 564         free(buf);
 565         return s;
 566 }
 567
 568 /*****************************************************************
 569  Return the binary string representation of a DOM_SID.
 570  Caller must free.
 571 *****************************************************************/
 572
 573 char *sid_binstring_hex(const DOM_SID *sid)
 574 {
 575         char *buf, *s;
 576         int len = sid_size(sid);
 577         buf = (char *)SMB_MALLOC(len);
 578         if (!buf)
 579                 return NULL;
 580         sid_linearize(buf, len, sid);
 581         s = binary_string(buf, len);
 582         free(buf);
 583         return s;
 584 }
 585
 586 /*******************************************************************
 587  Tallocs a duplicate SID.
 588 ********************************************************************/
 589
 590 DOM_SID *sid_dup_talloc(TALLOC_CTX *ctx, const DOM_SID *src)
 591 {
 592         DOM_SID *dst;
 593
 594         if(!src)
 595                 return NULL;
 596
 597         if((dst = TALLOC_ZERO_P(ctx, DOM_SID)) != NULL) {
 598                 sid_copy( dst, src);
 599         }
 600
 601         return dst;
 602 }
 603
 604 /********************************************************************
 605  Add SID to an array SIDs
 606 ********************************************************************/
 607
 608 bool add_sid_to_array(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 609                       DOM_SID **sids, size_t *num)
 610 {
 611         *sids = TALLOC_REALLOC_ARRAY(mem_ctx, *sids, DOM_SID,
 612                                              (*num)+1);
 613         if (*sids == NULL) {
 614                 *num = 0;
 615                 return False;
 616         }
 617
 618         sid_copy(&((*sids)[*num]), sid);
 619         *num += 1;
 620
 621         return True;
 622 }
 623
 624
 625 /********************************************************************
 626  Add SID to an array SIDs ensuring that it is not already there
 627 ********************************************************************/
 628
 629 bool add_sid_to_array_unique(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 630                              DOM_SID **sids, size_t *num_sids)
 631 {
 632         size_t i;
 633
 634         for (i=0; i<(*num_sids); i++) {
 635                 if (sid_compare(sid, &(*sids)[i]) == 0)
 636                         return True;
 637         }
 638
 639         return add_sid_to_array(mem_ctx, sid, sids, num_sids);
 640 }
 641
 642 /********************************************************************
 643  Remove SID from an array
 644 ********************************************************************/
 645
 646 void del_sid_from_array(const DOM_SID *sid, DOM_SID **sids, size_t *num)
 647 {
 648         DOM_SID *sid_list = *sids;
 649         size_t i;
 650
 651         for ( i=0; i<*num; i++ ) {
 652
 653                 /* if we find the SID, then decrement the count
 654                    and break out of the loop */
 655
 656                 if ( sid_equal(sid, &sid_list[i]) ) {
 657                         *num -= 1;
 658                         break;
 659                 }
 660         }
 661
 662         /* This loop will copy the remainder of the array
 663            if i < num of sids ni the array */
 664
 665         for ( ; i<*num; i++ )
 666                 sid_copy( &sid_list[i], &sid_list[i+1] );
 667
 668         return;
 669 }
 670
 671 bool add_rid_to_array_unique(TALLOC_CTX *mem_ctx,
 672                                     uint32 rid, uint32 **pp_rids, size_t *p_num)
 673 {
 674         size_t i;
 675
 676         for (i=0; i<*p_num; i++) {
 677                 if ((*pp_rids)[i] == rid)
 678                         return True;
 679         }
 680
 681         *pp_rids = TALLOC_REALLOC_ARRAY(mem_ctx, *pp_rids, uint32, *p_num+1);
 682
 683         if (*pp_rids == NULL) {
 684                 *p_num = 0;
 685                 return False;
 686         }
 687
 688         (*pp_rids)[*p_num] = rid;
 689         *p_num += 1;
 690         return True;
 691 }
 692
 693 bool is_null_sid(const DOM_SID *sid)
 694 {
 695         static const DOM_SID null_sid = {0};
 696         return sid_equal(sid, &null_sid);
 697 }
 698
 699 NTSTATUS sid_array_from_info3(TALLOC_CTX *mem_ctx,
 700                               const NET_USER_INFO_3 *info3,
 701                               DOM_SID **user_sids,
 702                               size_t *num_user_sids,
 703                               bool include_user_group_rid)
 704 {
 705         DOM_SID sid;
 706         DOM_SID *sid_array = NULL;
 707         size_t num_sids = 0;
 708         int i;
 709
 710         if (include_user_group_rid) {
 711
 712                 if (!sid_compose(&sid, &(info3->dom_sid.sid),
 713                                  info3->user_rid)
 714                     || !add_sid_to_array(mem_ctx, &sid,
 715                                          &sid_array, &num_sids)) {
 716                         DEBUG(3,("could not add user SID from rid 0x%x\n",
 717                                  info3->user_rid));
 718                         return NT_STATUS_INVALID_PARAMETER;
 719                 }
 720
 721                 if (!sid_compose(&sid, &(info3->dom_sid.sid),
 722                                  info3->group_rid)
 723                     || !add_sid_to_array(mem_ctx, &sid,
 724                                          &sid_array, &num_sids)) {
 725                         DEBUG(3,("could not append additional group rid 0x%x\n",
 726                                  info3->group_rid));
 727
 728                         return NT_STATUS_INVALID_PARAMETER;
 729                 }
 730         }
 731
 732         for (i = 0; i < info3->num_groups2; i++) {
 733                 if (!sid_compose(&sid, &(info3->dom_sid.sid),
 734                                  info3->gids[i].g_rid)
 735                     || !add_sid_to_array(mem_ctx, &sid,
 736                                          &sid_array, &num_sids)) {
 737                         DEBUG(3,("could not append additional group rid 0x%x\n",
 738                                  info3->gids[i].g_rid));
 739                         return NT_STATUS_INVALID_PARAMETER;
 740                 }
 741         }
 742
 743         /* Copy 'other' sids.  We need to do sid filtering here to
 744            prevent possible elevation of privileges.  See:
 745
 746            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 747          */
 748
 749         for (i = 0; i < info3->num_other_sids; i++) {
 750                 if (!add_sid_to_array(mem_ctx, &info3->other_sids[i].sid,
 751                                       &sid_array, &num_sids)) {
 752                         DEBUG(3, ("could not add SID to array: %s\n",
 753                                   sid_string_dbg(&info3->other_sids[i].sid)));
 754                         return NT_STATUS_NO_MEMORY;
 755                 }
 756         }
 757
 758         *user_sids = sid_array;
 759         *num_user_sids = num_sids;
 760
 761         return NT_STATUS_OK;
 762 }