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 #include "../librpc/gen_ndr/ndr_security.h"
  27 #include "../libcli/security/dom_sid.h"
  28
  29 /*
  30  * Some useful sids, more well known sids can be found at
  31  * http://support.microsoft.com/kb/243330/EN-US/
  32  */
  33
  34
  35 const struct dom_sid global_sid_World_Domain =               /* Everyone domain */
  36 { 1, 0, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  37 const struct dom_sid global_sid_World =                      /* Everyone */
  38 { 1, 1, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  39 const struct dom_sid global_sid_Creator_Owner_Domain =       /* Creator Owner domain */
  40 { 1, 0, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  41 const struct dom_sid global_sid_NT_Authority =                  /* NT Authority */
  42 { 1, 0, {0,0,0,0,0,5}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  43 const struct dom_sid global_sid_System =                        /* System */
  44 { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  45 const struct dom_sid global_sid_NULL =                          /* NULL sid */
  46 { 1, 1, {0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  47 const struct dom_sid global_sid_Authenticated_Users =   /* All authenticated rids */
  48 { 1, 1, {0,0,0,0,0,5}, {11,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  49 #if 0
  50 /* for documentation */
  51 const struct dom_sid global_sid_Restriced =                     /* Restriced Code */
  52 { 1, 1, {0,0,0,0,0,5}, {12,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  53 #endif
  54 const struct dom_sid global_sid_Network =                       /* Network rids */
  55 { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  56
  57 const struct dom_sid global_sid_Creator_Owner =         /* Creator Owner */
  58 { 1, 1, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  59 const struct dom_sid global_sid_Creator_Group =         /* Creator Group */
  60 { 1, 1, {0,0,0,0,0,3}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  61 const struct dom_sid global_sid_Anonymous =                     /* Anonymous login */
  62 { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  63
  64 const struct dom_sid global_sid_Builtin =                       /* Local well-known domain */
  65 { 1, 1, {0,0,0,0,0,5}, {32,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  66 const struct dom_sid global_sid_Builtin_Administrators =        /* Builtin administrators */
  67 { 1, 2, {0,0,0,0,0,5}, {32,544,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  68 const struct dom_sid global_sid_Builtin_Users =         /* Builtin users */
  69 { 1, 2, {0,0,0,0,0,5}, {32,545,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  70 const struct dom_sid global_sid_Builtin_Guests =                /* Builtin guest users */
  71 { 1, 2, {0,0,0,0,0,5}, {32,546,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  72 const struct dom_sid global_sid_Builtin_Power_Users =   /* Builtin power users */
  73 { 1, 2, {0,0,0,0,0,5}, {32,547,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  74 const struct dom_sid global_sid_Builtin_Account_Operators =     /* Builtin account operators */
  75 { 1, 2, {0,0,0,0,0,5}, {32,548,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  76 const struct dom_sid global_sid_Builtin_Server_Operators =      /* Builtin server operators */
  77 { 1, 2, {0,0,0,0,0,5}, {32,549,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  78 const struct dom_sid global_sid_Builtin_Print_Operators =       /* Builtin print operators */
  79 { 1, 2, {0,0,0,0,0,5}, {32,550,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  80 const struct dom_sid global_sid_Builtin_Backup_Operators =      /* Builtin backup operators */
  81 { 1, 2, {0,0,0,0,0,5}, {32,551,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  82 const struct dom_sid global_sid_Builtin_Replicator =            /* Builtin replicator */
  83 { 1, 2, {0,0,0,0,0,5}, {32,552,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  84 const struct dom_sid global_sid_Builtin_PreWin2kAccess =        /* Builtin pre win2k access */
  85 { 1, 2, {0,0,0,0,0,5}, {32,554,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  86
  87 const struct dom_sid global_sid_Unix_Users =                    /* Unmapped Unix users */
  88 { 1, 1, {0,0,0,0,0,22}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  89 const struct dom_sid global_sid_Unix_Groups =                   /* Unmapped Unix groups */
  90 { 1, 1, {0,0,0,0,0,22}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  91
  92 /* Unused, left here for documentary purposes */
  93 #if 0
  94 #define SECURITY_NULL_SID_AUTHORITY    0
  95 #define SECURITY_WORLD_SID_AUTHORITY   1
  96 #define SECURITY_LOCAL_SID_AUTHORITY   2
  97 #define SECURITY_CREATOR_SID_AUTHORITY 3
  98 #define SECURITY_NT_AUTHORITY          5
  99 #endif
 100
 101 /*
 102  * An NT compatible anonymous token.
 103  */
 104
 105 static struct dom_sid anon_sid_array[3] =
 106 { { 1, 1, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
 107   { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
 108   { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
 109 NT_USER_TOKEN anonymous_token = { 3, anon_sid_array, SE_NONE };
 110
 111 static struct dom_sid system_sid_array[1] =
 112 { { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
 113 NT_USER_TOKEN system_token = { 1, system_sid_array, SE_ALL_PRIVS };
 114
 115 /****************************************************************************
 116  Lookup string names for SID types.
 117 ****************************************************************************/
 118
 119 static const struct {
 120         enum lsa_SidType sid_type;
 121         const char *string;
 122 } sid_name_type[] = {
 123         {SID_NAME_USER, "User"},
 124         {SID_NAME_DOM_GRP, "Domain Group"},
 125         {SID_NAME_DOMAIN, "Domain"},
 126         {SID_NAME_ALIAS, "Local Group"},
 127         {SID_NAME_WKN_GRP, "Well-known Group"},
 128         {SID_NAME_DELETED, "Deleted Account"},
 129         {SID_NAME_INVALID, "Invalid Account"},
 130         {SID_NAME_UNKNOWN, "UNKNOWN"},
 131         {SID_NAME_COMPUTER, "Computer"},
 132
 133         {(enum lsa_SidType)0, NULL}
 134 };
 135
 136 const char *sid_type_lookup(uint32 sid_type)
 137 {
 138         int i = 0;
 139
 140         /* Look through list */
 141         while(sid_name_type[i].sid_type != 0) {
 142                 if (sid_name_type[i].sid_type == sid_type)
 143                         return sid_name_type[i].string;
 144                 i++;
 145         }
 146
 147         /* Default return */
 148         return "SID *TYPE* is INVALID";
 149 }
 150
 151 /**************************************************************************
 152  Create the SYSTEM token.
 153 ***************************************************************************/
 154
 155 NT_USER_TOKEN *get_system_token(void)
 156 {
 157         return &system_token;
 158 }
 159
 160 /*****************************************************************
 161  Convert a SID to an ascii string.
 162 *****************************************************************/
 163
 164 char *sid_to_fstring(fstring sidstr_out, const struct dom_sid *sid)
 165 {
 166         char *str = sid_string_talloc(talloc_tos(), sid);
 167         fstrcpy(sidstr_out, str);
 168         TALLOC_FREE(str);
 169         return sidstr_out;
 170 }
 171
 172 /*****************************************************************
 173  Essentially a renamed dom_sid_string from
 174  ../libcli/security/dom_sid.c with a panic if it didn't work.
 175 *****************************************************************/
 176
 177 char *sid_string_talloc(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
 178 {
 179         char *result = dom_sid_string(mem_ctx, sid);
 180         SMB_ASSERT(result != NULL);
 181         return result;
 182 }
 183
 184 /*****************************************************************
 185  Useful function for debug lines.
 186 *****************************************************************/
 187
 188 char *sid_string_dbg(const struct dom_sid *sid)
 189 {
 190         return sid_string_talloc(talloc_tos(), sid);
 191 }
 192
 193 /*****************************************************************
 194  Use with care!
 195 *****************************************************************/
 196
 197 char *sid_string_tos(const struct dom_sid *sid)
 198 {
 199         return sid_string_talloc(talloc_tos(), sid);
 200 }
 201
 202 /*****************************************************************
 203  Convert a string to a SID. Returns True on success, False on fail.
 204 *****************************************************************/
 205
 206 bool string_to_sid(struct dom_sid *sidout, const char *sidstr)
 207 {
 208         const char *p;
 209         char *q;
 210         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
 211         uint32 conv;
 212
 213         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
 214                 goto format_error;
 215         }
 216
 217         ZERO_STRUCTP(sidout);
 218
 219         /* Get the revision number. */
 220         p = sidstr + 2;
 221
 222         if (!isdigit(*p)) {
 223                 goto format_error;
 224         }
 225
 226         conv = (uint32) strtoul(p, &q, 10);
 227         if (!q || (*q != '-')) {
 228                 goto format_error;
 229         }
 230         sidout->sid_rev_num = (uint8) conv;
 231         q++;
 232
 233         if (!isdigit(*q)) {
 234                 goto format_error;
 235         }
 236
 237         /* get identauth */
 238         conv = (uint32) strtoul(q, &q, 10);
 239         if (!q || (*q != '-')) {
 240                 goto format_error;
 241         }
 242         /* identauth in decimal should be <  2^32 */
 243         /* NOTE - the conv value is in big-endian format. */
 244         sidout->id_auth[0] = 0;
 245         sidout->id_auth[1] = 0;
 246         sidout->id_auth[2] = (conv & 0xff000000) >> 24;
 247         sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
 248         sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
 249         sidout->id_auth[5] = (conv & 0x000000ff);
 250
 251         q++;
 252         sidout->num_auths = 0;
 253
 254         while (true) {
 255                 char *end;
 256
 257                 if (!isdigit(*q)) {
 258                         goto format_error;
 259                 }
 260
 261                 conv = strtoul(q, &end, 10);
 262                 if (end == q) {
 263                         goto format_error;
 264                 }
 265
 266                 if (!sid_append_rid(sidout, conv)) {
 267                         DEBUG(3, ("Too many sid auths in %s\n", sidstr));
 268                         return false;
 269                 }
 270
 271                 q = end;
 272                 if (*q == '\0') {
 273                         break;
 274                 }
 275                 if (*q != '-') {
 276                         goto format_error;
 277                 }
 278                 q += 1;
 279         }
 280         return true;
 281
 282 format_error:
 283         DEBUG(3, ("string_to_sid: SID %s is not in a valid format\n", sidstr));
 284         return false;
 285 }
 286
 287 /*****************************************************************
 288  Add a rid to the end of a sid
 289 *****************************************************************/
 290
 291 bool sid_append_rid(struct 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(struct dom_sid *dst, const struct 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(struct 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 struct 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 struct dom_sid *exp_dom_sid, const struct 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(struct dom_sid *dst, const struct 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 struct 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 struct dom_sid.
 399 *****************************************************************/
 400
 401 bool sid_parse(const char *inbuf, size_t len, struct 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 struct dom_sid *sid1, const struct 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 struct dom_sid *sid1, const struct 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 struct dom_sid *sid1, const struct 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 struct dom_sid *sid1, const struct 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(struct dom_sid *sid)
 502 {
 503         struct 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 struct dom_sid.
 520  Caller must free.
 521 *****************************************************************/
 522
 523 char *sid_binstring(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
 524 {
 525         uint8_t *buf;
 526         char *s;
 527         int len = ndr_size_dom_sid(sid, 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 struct dom_sid.
 540  Caller must free.
 541 *****************************************************************/
 542
 543 char *sid_binstring_hex(const struct dom_sid *sid)
 544 {
 545         char *buf, *s;
 546         int len = ndr_size_dom_sid(sid, 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 struct dom_sid *sid_dup_talloc(TALLOC_CTX *ctx, const struct dom_sid *src)
 561 {
 562         struct dom_sid *dst;
 563
 564         if (src == NULL) {
 565                 return NULL;
 566         }
 567         dst = talloc_zero(ctx, struct dom_sid);
 568         if (dst == NULL) {
 569                 return NULL;
 570         }
 571         sid_copy(dst, src);
 572         return dst;
 573 }
 574
 575 /********************************************************************
 576  Add SID to an array SIDs
 577 ********************************************************************/
 578
 579 NTSTATUS add_sid_to_array(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 580                           struct dom_sid **sids, size_t *num)
 581 {
 582         *sids = TALLOC_REALLOC_ARRAY(mem_ctx, *sids, struct dom_sid,
 583                                              (*num)+1);
 584         if (*sids == NULL) {
 585                 *num = 0;
 586                 return NT_STATUS_NO_MEMORY;
 587         }
 588
 589         sid_copy(&((*sids)[*num]), sid);
 590         *num += 1;
 591
 592         return NT_STATUS_OK;
 593 }
 594
 595
 596 /********************************************************************
 597  Add SID to an array SIDs ensuring that it is not already there
 598 ********************************************************************/
 599
 600 NTSTATUS add_sid_to_array_unique(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 601                                  struct dom_sid **sids, size_t *num_sids)
 602 {
 603         size_t i;
 604
 605         for (i=0; i<(*num_sids); i++) {
 606                 if (sid_compare(sid, &(*sids)[i]) == 0)
 607                         return NT_STATUS_OK;
 608         }
 609
 610         return add_sid_to_array(mem_ctx, sid, sids, num_sids);
 611 }
 612
 613 /********************************************************************
 614  Remove SID from an array
 615 ********************************************************************/
 616
 617 void del_sid_from_array(const struct dom_sid *sid, struct dom_sid **sids, size_t *num)
 618 {
 619         struct dom_sid *sid_list = *sids;
 620         size_t i;
 621
 622         for ( i=0; i<*num; i++ ) {
 623
 624                 /* if we find the SID, then decrement the count
 625                    and break out of the loop */
 626
 627                 if ( sid_equal(sid, &sid_list[i]) ) {
 628                         *num -= 1;
 629                         break;
 630                 }
 631         }
 632
 633         /* This loop will copy the remainder of the array
 634            if i < num of sids ni the array */
 635
 636         for ( ; i<*num; i++ )
 637                 sid_copy( &sid_list[i], &sid_list[i+1] );
 638
 639         return;
 640 }
 641
 642 bool add_rid_to_array_unique(TALLOC_CTX *mem_ctx,
 643                                     uint32 rid, uint32 **pp_rids, size_t *p_num)
 644 {
 645         size_t i;
 646
 647         for (i=0; i<*p_num; i++) {
 648                 if ((*pp_rids)[i] == rid)
 649                         return True;
 650         }
 651
 652         *pp_rids = TALLOC_REALLOC_ARRAY(mem_ctx, *pp_rids, uint32, *p_num+1);
 653
 654         if (*pp_rids == NULL) {
 655                 *p_num = 0;
 656                 return False;
 657         }
 658
 659         (*pp_rids)[*p_num] = rid;
 660         *p_num += 1;
 661         return True;
 662 }
 663
 664 bool is_null_sid(const struct dom_sid *sid)
 665 {
 666         static const struct dom_sid null_sid = {0};
 667         return sid_equal(sid, &null_sid);
 668 }
 669
 670 bool is_sid_in_token(const NT_USER_TOKEN *token, const struct dom_sid *sid)
 671 {
 672         int i;
 673
 674         for (i=0; i<token->num_sids; i++) {
 675                 if (sid_compare(sid, &token->user_sids[i]) == 0)
 676                         return true;
 677         }
 678         return false;
 679 }
 680
 681 NTSTATUS sid_array_from_info3(TALLOC_CTX *mem_ctx,
 682                               const struct netr_SamInfo3 *info3,
 683                               struct dom_sid **user_sids,
 684                               size_t *num_user_sids,
 685                               bool include_user_group_rid,
 686                               bool skip_ressource_groups)
 687 {
 688         NTSTATUS status;
 689         struct dom_sid sid;
 690         struct dom_sid *sid_array = NULL;
 691         size_t num_sids = 0;
 692         int i;
 693
 694         if (include_user_group_rid) {
 695                 if (!sid_compose(&sid, info3->base.domain_sid, info3->base.rid)) {
 696                         DEBUG(3, ("could not compose user SID from rid 0x%x\n",
 697                                   info3->base.rid));
 698                         return NT_STATUS_INVALID_PARAMETER;
 699                 }
 700                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
 701                 if (!NT_STATUS_IS_OK(status)) {
 702                         DEBUG(3, ("could not append user SID from rid 0x%x\n",
 703                                   info3->base.rid));
 704                         return status;
 705                 }
 706         }
 707
 708         if (!sid_compose(&sid, info3->base.domain_sid, info3->base.primary_gid)) {
 709                 DEBUG(3, ("could not compose group SID from rid 0x%x\n",
 710                           info3->base.primary_gid));
 711                 return NT_STATUS_INVALID_PARAMETER;
 712         }
 713         status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
 714         if (!NT_STATUS_IS_OK(status)) {
 715                 DEBUG(3, ("could not append group SID from rid 0x%x\n",
 716                           info3->base.rid));
 717                 return status;
 718         }
 719
 720         for (i = 0; i < info3->base.groups.count; i++) {
 721                 /* Don't add the primary group sid twice. */
 722                 if (info3->base.primary_gid == info3->base.groups.rids[i].rid) {
 723                         continue;
 724                 }
 725                 if (!sid_compose(&sid, info3->base.domain_sid,
 726                                  info3->base.groups.rids[i].rid)) {
 727                         DEBUG(3, ("could not compose SID from additional group "
 728                                   "rid 0x%x\n", info3->base.groups.rids[i].rid));
 729                         return NT_STATUS_INVALID_PARAMETER;
 730                 }
 731                 status = add_sid_to_array(mem_ctx, &sid, &sid_array, &num_sids);
 732                 if (!NT_STATUS_IS_OK(status)) {
 733                         DEBUG(3, ("could not append SID from additional group "
 734                                   "rid 0x%x\n", info3->base.groups.rids[i].rid));
 735                         return status;
 736                 }
 737         }
 738
 739         /* Copy 'other' sids.  We need to do sid filtering here to
 740            prevent possible elevation of privileges.  See:
 741
 742            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 743          */
 744
 745         for (i = 0; i < info3->sidcount; i++) {
 746
 747                 if (skip_ressource_groups &&
 748                     (info3->sids[i].attributes & SE_GROUP_RESOURCE)) {
 749                         continue;
 750                 }
 751
 752                 status = add_sid_to_array(mem_ctx, info3->sids[i].sid,
 753                                       &sid_array, &num_sids);
 754                 if (!NT_STATUS_IS_OK(status)) {
 755                         DEBUG(3, ("could not add SID to array: %s\n",
 756                                   sid_string_dbg(info3->sids[i].sid)));
 757                         return status;
 758                 }
 759         }
 760
 761         *user_sids = sid_array;
 762         *num_user_sids = num_sids;
 763
 764         return NT_STATUS_OK;
 765 }